/usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaChecking.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaChecking.cpp
Warning:	line 10829, column 7 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaChecking.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangSema/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangSema/obj/../include/clang/Sema -I /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangSema/../include -I /usr/src/gnu/usr.bin/clang/libclangSema/obj -I /usr/src/gnu/usr.bin/clang/libclangSema/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangSema/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaChecking.cpp
1//===- SemaChecking.cpp - Extra Semantic Checking -------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file implements extra semantic analysis beyond what is enforced
10//  by the C type system.
11//
12//===----------------------------------------------------------------------===//

14#include "clang/AST/APValue.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/Attr.h"
17#include "clang/AST/AttrIterator.h"
18#include "clang/AST/CharUnits.h"
19#include "clang/AST/Decl.h"
20#include "clang/AST/DeclBase.h"
21#include "clang/AST/DeclCXX.h"
22#include "clang/AST/DeclObjC.h"
23#include "clang/AST/DeclarationName.h"
24#include "clang/AST/EvaluatedExprVisitor.h"
25#include "clang/AST/Expr.h"
26#include "clang/AST/ExprCXX.h"
27#include "clang/AST/ExprObjC.h"
28#include "clang/AST/ExprOpenMP.h"
29#include "clang/AST/FormatString.h"
30#include "clang/AST/NSAPI.h"
31#include "clang/AST/NonTrivialTypeVisitor.h"
32#include "clang/AST/OperationKinds.h"
33#include "clang/AST/RecordLayout.h"
34#include "clang/AST/Stmt.h"
35#include "clang/AST/TemplateBase.h"
36#include "clang/AST/Type.h"
37#include "clang/AST/TypeLoc.h"
38#include "clang/AST/UnresolvedSet.h"
39#include "clang/Basic/AddressSpaces.h"
40#include "clang/Basic/CharInfo.h"
41#include "clang/Basic/Diagnostic.h"
42#include "clang/Basic/IdentifierTable.h"
43#include "clang/Basic/LLVM.h"
44#include "clang/Basic/LangOptions.h"
45#include "clang/Basic/OpenCLOptions.h"
46#include "clang/Basic/OperatorKinds.h"
47#include "clang/Basic/PartialDiagnostic.h"
48#include "clang/Basic/SourceLocation.h"
49#include "clang/Basic/SourceManager.h"
50#include "clang/Basic/Specifiers.h"
51#include "clang/Basic/SyncScope.h"
52#include "clang/Basic/TargetBuiltins.h"
53#include "clang/Basic/TargetCXXABI.h"
54#include "clang/Basic/TargetInfo.h"
55#include "clang/Basic/TypeTraits.h"
56#include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
57#include "clang/Sema/Initialization.h"
58#include "clang/Sema/Lookup.h"
59#include "clang/Sema/Ownership.h"
60#include "clang/Sema/Scope.h"
61#include "clang/Sema/ScopeInfo.h"
62#include "clang/Sema/Sema.h"
63#include "clang/Sema/SemaInternal.h"
64#include "llvm/ADT/APFloat.h"
65#include "llvm/ADT/APInt.h"
66#include "llvm/ADT/APSInt.h"
67#include "llvm/ADT/ArrayRef.h"
68#include "llvm/ADT/DenseMap.h"
69#include "llvm/ADT/FoldingSet.h"
70#include "llvm/ADT/None.h"
71#include "llvm/ADT/Optional.h"
72#include "llvm/ADT/STLExtras.h"
73#include "llvm/ADT/SmallBitVector.h"
74#include "llvm/ADT/SmallPtrSet.h"
75#include "llvm/ADT/SmallString.h"
76#include "llvm/ADT/SmallVector.h"
77#include "llvm/ADT/StringRef.h"
78#include "llvm/ADT/StringSet.h"
79#include "llvm/ADT/StringSwitch.h"
80#include "llvm/ADT/Triple.h"
81#include "llvm/Support/AtomicOrdering.h"
82#include "llvm/Support/Casting.h"
83#include "llvm/Support/Compiler.h"
84#include "llvm/Support/ConvertUTF.h"
85#include "llvm/Support/ErrorHandling.h"
86#include "llvm/Support/Format.h"
87#include "llvm/Support/Locale.h"
88#include "llvm/Support/MathExtras.h"
89#include "llvm/Support/SaveAndRestore.h"
90#include "llvm/Support/raw_ostream.h"
91#include <algorithm>
92#include <bitset>
93#include <cassert>
94#include <cctype>
95#include <cstddef>
96#include <cstdint>
97#include <functional>
98#include <limits>
99#include <string>
100#include <tuple>
101#include <utility>

103using namespace clang;
104using namespace sema;

106SourceLocation Sema::getLocationOfStringLiteralByte(const StringLiteral *SL,
                                                  unsigned ByteNo) const {
return SL->getLocationOfByte(ByteNo, getSourceManager(), LangOpts,
                             Context.getTargetInfo());
110}

112/// Checks that a call expression's argument count is the desired number.
113/// This is useful when doing custom type-checking.  Returns true on error.
114static bool checkArgCount(Sema &S, CallExpr *call, unsigned desiredArgCount) {
unsigned argCount = call->getNumArgs();
if (argCount == desiredArgCount) return false;

if (argCount < desiredArgCount)
  return S.Diag(call->getEndLoc(), diag::err_typecheck_call_too_few_args)
         << 0 /*function call*/ << desiredArgCount << argCount
         << call->getSourceRange();

// Highlight all the excess arguments.
SourceRange range(call->getArg(desiredArgCount)->getBeginLoc(),
                  call->getArg(argCount - 1)->getEndLoc());

return S.Diag(range.getBegin(), diag::err_typecheck_call_too_many_args)
  << 0 /*function call*/ << desiredArgCount << argCount
  << call->getArg(1)->getSourceRange();
130}

132/// Check that the first argument to __builtin_annotation is an integer
133/// and the second argument is a non-wide string literal.
134static bool SemaBuiltinAnnotation(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 2))
  return true;

// First argument should be an integer.
Expr *ValArg = TheCall->getArg(0);
QualType Ty = ValArg->getType();
if (!Ty->isIntegerType()) {
  S.Diag(ValArg->getBeginLoc(), diag::err_builtin_annotation_first_arg)
      << ValArg->getSourceRange();
  return true;
}

// Second argument should be a constant string.
Expr *StrArg = TheCall->getArg(1)->IgnoreParenCasts();
StringLiteral *Literal = dyn_cast<StringLiteral>(StrArg);
if (!Literal || !Literal->isAscii()) {
  S.Diag(StrArg->getBeginLoc(), diag::err_builtin_annotation_second_arg)
      << StrArg->getSourceRange();
  return true;
}

TheCall->setType(Ty);
return false;
158}

160static bool SemaBuiltinMSVCAnnotation(Sema &S, CallExpr *TheCall) {
// We need at least one argument.
if (TheCall->getNumArgs() < 1) {
  S.Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
      << 0 << 1 << TheCall->getNumArgs()
      << TheCall->getCallee()->getSourceRange();
  return true;
}

// All arguments should be wide string literals.
for (Expr *Arg : TheCall->arguments()) {
  auto *Literal = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts());
  if (!Literal || !Literal->isWide()) {
    S.Diag(Arg->getBeginLoc(), diag::err_msvc_annotation_wide_str)
        << Arg->getSourceRange();
    return true;
  }
}

return false;
180}

182/// Check that the argument to __builtin_addressof is a glvalue, and set the
183/// result type to the corresponding pointer type.
184static bool SemaBuiltinAddressof(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
  return true;

ExprResult Arg(TheCall->getArg(0));
QualType ResultType = S.CheckAddressOfOperand(Arg, TheCall->getBeginLoc());
if (ResultType.isNull())
  return true;

TheCall->setArg(0, Arg.get());
TheCall->setType(ResultType);
return false;
196}

198/// Check the number of arguments and set the result type to
199/// the argument type.
200static bool SemaBuiltinPreserveAI(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
  return true;

TheCall->setType(TheCall->getArg(0)->getType());
return false;
206}

208/// Check that the value argument for __builtin_is_aligned(value, alignment) and
209/// __builtin_aligned_{up,down}(value, alignment) is an integer or a pointer
210/// type (but not a function pointer) and that the alignment is a power-of-two.
211static bool SemaBuiltinAlignment(Sema &S, CallExpr *TheCall, unsigned ID) {
if (checkArgCount(S, TheCall, 2))
  return true;

clang::Expr *Source = TheCall->getArg(0);
bool IsBooleanAlignBuiltin = ID == Builtin::BI__builtin_is_aligned;

auto IsValidIntegerType = [](QualType Ty) {
  return Ty->isIntegerType() && !Ty->isEnumeralType() && !Ty->isBooleanType();
};
QualType SrcTy = Source->getType();
// We should also be able to use it with arrays (but not functions!).
if (SrcTy->canDecayToPointerType() && SrcTy->isArrayType()) {
  SrcTy = S.Context.getDecayedType(SrcTy);
}
if ((!SrcTy->isPointerType() && !IsValidIntegerType(SrcTy)) ||
    SrcTy->isFunctionPointerType()) {
  // FIXME: this is not quite the right error message since we don't allow
  // floating point types, or member pointers.
  S.Diag(Source->getExprLoc(), diag::err_typecheck_expect_scalar_operand)
      << SrcTy;
  return true;
}

clang::Expr *AlignOp = TheCall->getArg(1);
if (!IsValidIntegerType(AlignOp->getType())) {
  S.Diag(AlignOp->getExprLoc(), diag::err_typecheck_expect_int)
      << AlignOp->getType();
  return true;
}
Expr::EvalResult AlignResult;
unsigned MaxAlignmentBits = S.Context.getIntWidth(SrcTy) - 1;
// We can't check validity of alignment if it is value dependent.
if (!AlignOp->isValueDependent() &&
    AlignOp->EvaluateAsInt(AlignResult, S.Context,
                           Expr::SE_AllowSideEffects)) {
  llvm::APSInt AlignValue = AlignResult.Val.getInt();
  llvm::APSInt MaxValue(
      llvm::APInt::getOneBitSet(MaxAlignmentBits + 1, MaxAlignmentBits));
  if (AlignValue < 1) {
    S.Diag(AlignOp->getExprLoc(), diag::err_alignment_too_small) << 1;
    return true;
  }
  if (llvm::APSInt::compareValues(AlignValue, MaxValue) > 0) {
    S.Diag(AlignOp->getExprLoc(), diag::err_alignment_too_big)
        << toString(MaxValue, 10);
    return true;
  }
  if (!AlignValue.isPowerOf2()) {
    S.Diag(AlignOp->getExprLoc(), diag::err_alignment_not_power_of_two);
    return true;
  }
  if (AlignValue == 1) {
    S.Diag(AlignOp->getExprLoc(), diag::warn_alignment_builtin_useless)
        << IsBooleanAlignBuiltin;
  }
}

ExprResult SrcArg = S.PerformCopyInitialization(
    InitializedEntity::InitializeParameter(S.Context, SrcTy, false),
    SourceLocation(), Source);
if (SrcArg.isInvalid())
  return true;
TheCall->setArg(0, SrcArg.get());
ExprResult AlignArg =
    S.PerformCopyInitialization(InitializedEntity::InitializeParameter(
                                    S.Context, AlignOp->getType(), false),
                                SourceLocation(), AlignOp);
if (AlignArg.isInvalid())
  return true;
TheCall->setArg(1, AlignArg.get());
// For align_up/align_down, the return type is the same as the (potentially
// decayed) argument type including qualifiers. For is_aligned(), the result
// is always bool.
TheCall->setType(IsBooleanAlignBuiltin ? S.Context.BoolTy : SrcTy);
return false;
287}

289static bool SemaBuiltinOverflow(Sema &S, CallExpr *TheCall,
                              unsigned BuiltinID) {
if (checkArgCount(S, TheCall, 3))
  return true;

// First two arguments should be integers.
for (unsigned I = 0; I < 2; ++I) {
  ExprResult Arg = S.DefaultFunctionArrayLvalueConversion(TheCall->getArg(I));
  if (Arg.isInvalid()) return true;
  TheCall->setArg(I, Arg.get());

  QualType Ty = Arg.get()->getType();
  if (!Ty->isIntegerType()) {
    S.Diag(Arg.get()->getBeginLoc(), diag::err_overflow_builtin_must_be_int)
        << Ty << Arg.get()->getSourceRange();
    return true;
  }
}

// Third argument should be a pointer to a non-const integer.
// IRGen correctly handles volatile, restrict, and address spaces, and
// the other qualifiers aren't possible.
{
  ExprResult Arg = S.DefaultFunctionArrayLvalueConversion(TheCall->getArg(2));
  if (Arg.isInvalid()) return true;
  TheCall->setArg(2, Arg.get());

  QualType Ty = Arg.get()->getType();
  const auto *PtrTy = Ty->getAs<PointerType>();
  if (!PtrTy ||
      !PtrTy->getPointeeType()->isIntegerType() ||
      PtrTy->getPointeeType().isConstQualified()) {
    S.Diag(Arg.get()->getBeginLoc(),
           diag::err_overflow_builtin_must_be_ptr_int)
      << Ty << Arg.get()->getSourceRange();
    return true;
  }
}

// Disallow signed ExtIntType args larger than 128 bits to mul function until
// we improve backend support.
if (BuiltinID == Builtin::BI__builtin_mul_overflow) {
  for (unsigned I = 0; I < 3; ++I) {
    const auto Arg = TheCall->getArg(I);
    // Third argument will be a pointer.
    auto Ty = I < 2 ? Arg->getType() : Arg->getType()->getPointeeType();
    if (Ty->isExtIntType() && Ty->isSignedIntegerType() &&
        S.getASTContext().getIntWidth(Ty) > 128)
      return S.Diag(Arg->getBeginLoc(),
                    diag::err_overflow_builtin_ext_int_max_size)
             << 128;
  }
}

return false;
344}

346static bool SemaBuiltinCallWithStaticChain(Sema &S, CallExpr *BuiltinCall) {
if (checkArgCount(S, BuiltinCall, 2))
  return true;

SourceLocation BuiltinLoc = BuiltinCall->getBeginLoc();
Expr *Builtin = BuiltinCall->getCallee()->IgnoreImpCasts();
Expr *Call = BuiltinCall->getArg(0);
Expr *Chain = BuiltinCall->getArg(1);

if (Call->getStmtClass() != Stmt::CallExprClass) {
  S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_not_call)
      << Call->getSourceRange();
  return true;
}

auto CE = cast<CallExpr>(Call);
if (CE->getCallee()->getType()->isBlockPointerType()) {
  S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_block_call)
      << Call->getSourceRange();
  return true;
}

const Decl *TargetDecl = CE->getCalleeDecl();
if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
  if (FD->getBuiltinID()) {
    S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_builtin_call)
        << Call->getSourceRange();
    return true;
  }

if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) {
  S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_pdtor_call)
      << Call->getSourceRange();
  return true;
}

ExprResult ChainResult = S.UsualUnaryConversions(Chain);
if (ChainResult.isInvalid())
  return true;
if (!ChainResult.get()->getType()->isPointerType()) {
  S.Diag(BuiltinLoc, diag::err_second_argument_to_cwsc_not_pointer)
      << Chain->getSourceRange();
  return true;
}

QualType ReturnTy = CE->getCallReturnType(S.Context);
QualType ArgTys[2] = { ReturnTy, ChainResult.get()->getType() };
QualType BuiltinTy = S.Context.getFunctionType(
    ReturnTy, ArgTys, FunctionProtoType::ExtProtoInfo());
QualType BuiltinPtrTy = S.Context.getPointerType(BuiltinTy);

Builtin =
    S.ImpCastExprToType(Builtin, BuiltinPtrTy, CK_BuiltinFnToFnPtr).get();

BuiltinCall->setType(CE->getType());
BuiltinCall->setValueKind(CE->getValueKind());
BuiltinCall->setObjectKind(CE->getObjectKind());
BuiltinCall->setCallee(Builtin);
BuiltinCall->setArg(1, ChainResult.get());

return false;
407}

409namespace {

411class EstimateSizeFormatHandler
  : public analyze_format_string::FormatStringHandler {
size_t Size;

415public:
EstimateSizeFormatHandler(StringRef Format)
    : Size(std::min(Format.find(0), Format.size()) +
           1 /* null byte always written by sprintf */) {}

bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
                           const char *, unsigned SpecifierLen) override {

  const size_t FieldWidth = computeFieldWidth(FS);
  const size_t Precision = computePrecision(FS);

  // The actual format.
  switch (FS.getConversionSpecifier().getKind()) {
  // Just a char.
  case analyze_format_string::ConversionSpecifier::cArg:
  case analyze_format_string::ConversionSpecifier::CArg:
    Size += std::max(FieldWidth, (size_t)1);
    break;
  // Just an integer.
  case analyze_format_string::ConversionSpecifier::dArg:
  case analyze_format_string::ConversionSpecifier::DArg:
  case analyze_format_string::ConversionSpecifier::iArg:
  case analyze_format_string::ConversionSpecifier::oArg:
  case analyze_format_string::ConversionSpecifier::OArg:
  case analyze_format_string::ConversionSpecifier::uArg:
  case analyze_format_string::ConversionSpecifier::UArg:
  case analyze_format_string::ConversionSpecifier::xArg:
  case analyze_format_string::ConversionSpecifier::XArg:
    Size += std::max(FieldWidth, Precision);
    break;

  // %g style conversion switches between %f or %e style dynamically.
  // %f always takes less space, so default to it.
  case analyze_format_string::ConversionSpecifier::gArg:
  case analyze_format_string::ConversionSpecifier::GArg:

  // Floating point number in the form '[+]ddd.ddd'.
  case analyze_format_string::ConversionSpecifier::fArg:
  case analyze_format_string::ConversionSpecifier::FArg:
    Size += std::max(FieldWidth, 1 /* integer part */ +
                                     (Precision ? 1 + Precision
                                                : 0) /* period + decimal */);
    break;

  // Floating point number in the form '[-]d.ddde[+-]dd'.
  case analyze_format_string::ConversionSpecifier::eArg:
  case analyze_format_string::ConversionSpecifier::EArg:
    Size +=
        std::max(FieldWidth,
                 1 /* integer part */ +
                     (Precision ? 1 + Precision : 0) /* period + decimal */ +
                     1 /* e or E letter */ + 2 /* exponent */);
    break;

  // Floating point number in the form '[-]0xh.hhhhp±dd'.
  case analyze_format_string::ConversionSpecifier::aArg:
  case analyze_format_string::ConversionSpecifier::AArg:
    Size +=
        std::max(FieldWidth,
                 2 /* 0x */ + 1 /* integer part */ +
                     (Precision ? 1 + Precision : 0) /* period + decimal */ +
                     1 /* p or P letter */ + 1 /* + or - */ + 1 /* value */);
    break;

  // Just a string.
  case analyze_format_string::ConversionSpecifier::sArg:
  case analyze_format_string::ConversionSpecifier::SArg:
    Size += FieldWidth;
    break;

  // Just a pointer in the form '0xddd'.
  case analyze_format_string::ConversionSpecifier::pArg:
    Size += std::max(FieldWidth, 2 /* leading 0x */ + Precision);
    break;

  // A plain percent.
  case analyze_format_string::ConversionSpecifier::PercentArg:
    Size += 1;
    break;

  default:
    break;
  }

  Size += FS.hasPlusPrefix() || FS.hasSpacePrefix();

  if (FS.hasAlternativeForm()) {
    switch (FS.getConversionSpecifier().getKind()) {
    default:
      break;
    // Force a leading '0'.
    case analyze_format_string::ConversionSpecifier::oArg:
      Size += 1;
      break;
    // Force a leading '0x'.
    case analyze_format_string::ConversionSpecifier::xArg:
    case analyze_format_string::ConversionSpecifier::XArg:
      Size += 2;
      break;
    // Force a period '.' before decimal, even if precision is 0.
    case analyze_format_string::ConversionSpecifier::aArg:
    case analyze_format_string::ConversionSpecifier::AArg:
    case analyze_format_string::ConversionSpecifier::eArg:
    case analyze_format_string::ConversionSpecifier::EArg:
    case analyze_format_string::ConversionSpecifier::fArg:
    case analyze_format_string::ConversionSpecifier::FArg:
    case analyze_format_string::ConversionSpecifier::gArg:
    case analyze_format_string::ConversionSpecifier::GArg:
      Size += (Precision ? 0 : 1);
      break;
    }
  }
  assert(SpecifierLen <= Size && "no underflow")((void)0);
  Size -= SpecifierLen;
  return true;
}

size_t getSizeLowerBound() const { return Size; }

534private:
static size_t computeFieldWidth(const analyze_printf::PrintfSpecifier &FS) {
  const analyze_format_string::OptionalAmount &FW = FS.getFieldWidth();
  size_t FieldWidth = 0;
  if (FW.getHowSpecified() == analyze_format_string::OptionalAmount::Constant)
    FieldWidth = FW.getConstantAmount();
  return FieldWidth;
}

static size_t computePrecision(const analyze_printf::PrintfSpecifier &FS) {
  const analyze_format_string::OptionalAmount &FW = FS.getPrecision();
  size_t Precision = 0;

  // See man 3 printf for default precision value based on the specifier.
  switch (FW.getHowSpecified()) {
  case analyze_format_string::OptionalAmount::NotSpecified:
    switch (FS.getConversionSpecifier().getKind()) {
    default:
      break;
    case analyze_format_string::ConversionSpecifier::dArg: // %d
    case analyze_format_string::ConversionSpecifier::DArg: // %D
    case analyze_format_string::ConversionSpecifier::iArg: // %i
      Precision = 1;
      break;
    case analyze_format_string::ConversionSpecifier::oArg: // %d
    case analyze_format_string::ConversionSpecifier::OArg: // %D
    case analyze_format_string::ConversionSpecifier::uArg: // %d
    case analyze_format_string::ConversionSpecifier::UArg: // %D
    case analyze_format_string::ConversionSpecifier::xArg: // %d
    case analyze_format_string::ConversionSpecifier::XArg: // %D
      Precision = 1;
      break;
    case analyze_format_string::ConversionSpecifier::fArg: // %f
    case analyze_format_string::ConversionSpecifier::FArg: // %F
    case analyze_format_string::ConversionSpecifier::eArg: // %e
    case analyze_format_string::ConversionSpecifier::EArg: // %E
    case analyze_format_string::ConversionSpecifier::gArg: // %g
    case analyze_format_string::ConversionSpecifier::GArg: // %G
      Precision = 6;
      break;
    case analyze_format_string::ConversionSpecifier::pArg: // %d
      Precision = 1;
      break;
    }
    break;
  case analyze_format_string::OptionalAmount::Constant:
    Precision = FW.getConstantAmount();
    break;
  default:
    break;
  }
  return Precision;
}
587};

589} // namespace

591/// Check a call to BuiltinID for buffer overflows. If BuiltinID is a
592/// __builtin_*_chk function, then use the object size argument specified in the
593/// source. Otherwise, infer the object size using __builtin_object_size.
594void Sema::checkFortifiedBuiltinMemoryFunction(FunctionDecl *FD,
                                             CallExpr *TheCall) {
// FIXME: There are some more useful checks we could be doing here:
//  - Evaluate strlen of strcpy arguments, use as object size.

if (TheCall->isValueDependent() || TheCall->isTypeDependent() ||
    isConstantEvaluated())
  return;

unsigned BuiltinID = FD->getBuiltinID(/*ConsiderWrappers=*/true);
if (!BuiltinID)
  return;

const TargetInfo &TI = getASTContext().getTargetInfo();
unsigned SizeTypeWidth = TI.getTypeWidth(TI.getSizeType());

unsigned DiagID = 0;
bool IsChkVariant = false;
Optional<llvm::APSInt> UsedSize;
unsigned SizeIndex, ObjectIndex;
switch (BuiltinID) {
default:
  return;
case Builtin::BIsprintf:
case Builtin::BI__builtin___sprintf_chk: {
  size_t FormatIndex = BuiltinID == Builtin::BIsprintf ? 1 : 3;
  auto *FormatExpr = TheCall->getArg(FormatIndex)->IgnoreParenImpCasts();

  if (auto *Format = dyn_cast<StringLiteral>(FormatExpr)) {

    if (!Format->isAscii() && !Format->isUTF8())
      return;

    StringRef FormatStrRef = Format->getString();
    EstimateSizeFormatHandler H(FormatStrRef);
    const char *FormatBytes = FormatStrRef.data();
    const ConstantArrayType *T =
        Context.getAsConstantArrayType(Format->getType());
    assert(T && "String literal not of constant array type!")((void)0);
    size_t TypeSize = T->getSize().getZExtValue();

    // In case there's a null byte somewhere.
    size_t StrLen =
        std::min(std::max(TypeSize, size_t(1)) - 1, FormatStrRef.find(0));
    if (!analyze_format_string::ParsePrintfString(
            H, FormatBytes, FormatBytes + StrLen, getLangOpts(),
            Context.getTargetInfo(), false)) {
      DiagID = diag::warn_fortify_source_format_overflow;
      UsedSize = llvm::APSInt::getUnsigned(H.getSizeLowerBound())
                     .extOrTrunc(SizeTypeWidth);
      if (BuiltinID == Builtin::BI__builtin___sprintf_chk) {
        IsChkVariant = true;
        ObjectIndex = 2;
      } else {
        IsChkVariant = false;
        ObjectIndex = 0;
      }
      break;
    }
  }
  return;
}
case Builtin::BI__builtin___memcpy_chk:
case Builtin::BI__builtin___memmove_chk:
case Builtin::BI__builtin___memset_chk:
case Builtin::BI__builtin___strlcat_chk:
case Builtin::BI__builtin___strlcpy_chk:
case Builtin::BI__builtin___strncat_chk:
case Builtin::BI__builtin___strncpy_chk:
case Builtin::BI__builtin___stpncpy_chk:
case Builtin::BI__builtin___memccpy_chk:
case Builtin::BI__builtin___mempcpy_chk: {
  DiagID = diag::warn_builtin_chk_overflow;
  IsChkVariant = true;
  SizeIndex = TheCall->getNumArgs() - 2;
  ObjectIndex = TheCall->getNumArgs() - 1;
  break;
}

case Builtin::BI__builtin___snprintf_chk:
case Builtin::BI__builtin___vsnprintf_chk: {
  DiagID = diag::warn_builtin_chk_overflow;
  IsChkVariant = true;
  SizeIndex = 1;
  ObjectIndex = 3;
  break;
}

case Builtin::BIstrncat:
case Builtin::BI__builtin_strncat:
case Builtin::BIstrncpy:
case Builtin::BI__builtin_strncpy:
case Builtin::BIstpncpy:
case Builtin::BI__builtin_stpncpy: {
  // Whether these functions overflow depends on the runtime strlen of the
  // string, not just the buffer size, so emitting the "always overflow"
  // diagnostic isn't quite right. We should still diagnose passing a buffer
  // size larger than the destination buffer though; this is a runtime abort
  // in _FORTIFY_SOURCE mode, and is quite suspicious otherwise.
  DiagID = diag::warn_fortify_source_size_mismatch;
  SizeIndex = TheCall->getNumArgs() - 1;
  ObjectIndex = 0;
  break;
}

case Builtin::BImemcpy:
case Builtin::BI__builtin_memcpy:
case Builtin::BImemmove:
case Builtin::BI__builtin_memmove:
case Builtin::BImemset:
case Builtin::BI__builtin_memset:
case Builtin::BImempcpy:
case Builtin::BI__builtin_mempcpy: {
  DiagID = diag::warn_fortify_source_overflow;
  SizeIndex = TheCall->getNumArgs() - 1;
  ObjectIndex = 0;
  break;
}
case Builtin::BIsnprintf:
case Builtin::BI__builtin_snprintf:
case Builtin::BIvsnprintf:
case Builtin::BI__builtin_vsnprintf: {
  DiagID = diag::warn_fortify_source_size_mismatch;
  SizeIndex = 1;
  ObjectIndex = 0;
  break;
}
}

llvm::APSInt ObjectSize;
// For __builtin___*_chk, the object size is explicitly provided by the caller
// (usually using __builtin_object_size). Use that value to check this call.
if (IsChkVariant) {
  Expr::EvalResult Result;
  Expr *SizeArg = TheCall->getArg(ObjectIndex);
  if (!SizeArg->EvaluateAsInt(Result, getASTContext()))
    return;
  ObjectSize = Result.Val.getInt();

// Otherwise, try to evaluate an imaginary call to __builtin_object_size.
} else {
  // If the parameter has a pass_object_size attribute, then we should use its
  // (potentially) more strict checking mode. Otherwise, conservatively assume
  // type 0.
  int BOSType = 0;
  if (const auto *POS =
          FD->getParamDecl(ObjectIndex)->getAttr<PassObjectSizeAttr>())
    BOSType = POS->getType();

  Expr *ObjArg = TheCall->getArg(ObjectIndex);
  uint64_t Result;
  if (!ObjArg->tryEvaluateObjectSize(Result, getASTContext(), BOSType))
    return;
  // Get the object size in the target's size_t width.
  ObjectSize = llvm::APSInt::getUnsigned(Result).extOrTrunc(SizeTypeWidth);
}

// Evaluate the number of bytes of the object that this call will use.
if (!UsedSize) {
  Expr::EvalResult Result;
  Expr *UsedSizeArg = TheCall->getArg(SizeIndex);
  if (!UsedSizeArg->EvaluateAsInt(Result, getASTContext()))
    return;
  UsedSize = Result.Val.getInt().extOrTrunc(SizeTypeWidth);
}

if (UsedSize.getValue().ule(ObjectSize))
  return;

StringRef FunctionName = getASTContext().BuiltinInfo.getName(BuiltinID);
// Skim off the details of whichever builtin was called to produce a better
// diagnostic, as it's unlikley that the user wrote the __builtin explicitly.
if (IsChkVariant) {
  FunctionName = FunctionName.drop_front(std::strlen("__builtin___"));
  FunctionName = FunctionName.drop_back(std::strlen("_chk"));
} else if (FunctionName.startswith("__builtin_")) {
  FunctionName = FunctionName.drop_front(std::strlen("__builtin_"));
}

DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
                    PDiag(DiagID)
                        << FunctionName << toString(ObjectSize, /*Radix=*/10)
                        << toString(UsedSize.getValue(), /*Radix=*/10));
777}

779static bool SemaBuiltinSEHScopeCheck(Sema &SemaRef, CallExpr *TheCall,
                                   Scope::ScopeFlags NeededScopeFlags,
                                   unsigned DiagID) {
// Scopes aren't available during instantiation. Fortunately, builtin
// functions cannot be template args so they cannot be formed through template
// instantiation. Therefore checking once during the parse is sufficient.
if (SemaRef.inTemplateInstantiation())
  return false;

Scope *S = SemaRef.getCurScope();
while (S && !S->isSEHExceptScope())
  S = S->getParent();
if (!S || !(S->getFlags() & NeededScopeFlags)) {
  auto *DRE = cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
  SemaRef.Diag(TheCall->getExprLoc(), DiagID)
      << DRE->getDecl()->getIdentifier();
  return true;
}

return false;
799}

801static inline bool isBlockPointer(Expr *Arg) {
return Arg->getType()->isBlockPointerType();
803}

805/// OpenCL C v2.0, s6.13.17.2 - Checks that the block parameters are all local
806/// void*, which is a requirement of device side enqueue.
807static bool checkOpenCLBlockArgs(Sema &S, Expr *BlockArg) {
const BlockPointerType *BPT =
    cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
ArrayRef<QualType> Params =
    BPT->getPointeeType()->castAs<FunctionProtoType>()->getParamTypes();
unsigned ArgCounter = 0;
bool IllegalParams = false;
// Iterate through the block parameters until either one is found that is not
// a local void*, or the block is valid.
for (ArrayRef<QualType>::iterator I = Params.begin(), E = Params.end();
     I != E; ++I, ++ArgCounter) {
  if (!(*I)->isPointerType() || !(*I)->getPointeeType()->isVoidType() ||
      (*I)->getPointeeType().getQualifiers().getAddressSpace() !=
          LangAS::opencl_local) {
    // Get the location of the error. If a block literal has been passed
    // (BlockExpr) then we can point straight to the offending argument,
    // else we just point to the variable reference.
    SourceLocation ErrorLoc;
    if (isa<BlockExpr>(BlockArg)) {
      BlockDecl *BD = cast<BlockExpr>(BlockArg)->getBlockDecl();
      ErrorLoc = BD->getParamDecl(ArgCounter)->getBeginLoc();
    } else if (isa<DeclRefExpr>(BlockArg)) {
      ErrorLoc = cast<DeclRefExpr>(BlockArg)->getBeginLoc();
    }
    S.Diag(ErrorLoc,
           diag::err_opencl_enqueue_kernel_blocks_non_local_void_args);
    IllegalParams = true;
  }
}

return IllegalParams;
838}

840static bool checkOpenCLSubgroupExt(Sema &S, CallExpr *Call) {
if (!S.getOpenCLOptions().isSupported("cl_khr_subgroups", S.getLangOpts())) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_requires_extension)
      << 1 << Call->getDirectCallee() << "cl_khr_subgroups";
  return true;
}
return false;
847}

849static bool SemaOpenCLBuiltinNDRangeAndBlock(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 2))
  return true;

if (checkOpenCLSubgroupExt(S, TheCall))
  return true;

// First argument is an ndrange_t type.
Expr *NDRangeArg = TheCall->getArg(0);
if (NDRangeArg->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
  S.Diag(NDRangeArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
      << TheCall->getDirectCallee() << "'ndrange_t'";
  return true;
}

Expr *BlockArg = TheCall->getArg(1);
if (!isBlockPointer(BlockArg)) {
  S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
      << TheCall->getDirectCallee() << "block";
  return true;
}
return checkOpenCLBlockArgs(S, BlockArg);
871}

873/// OpenCL C v2.0, s6.13.17.6 - Check the argument to the
874/// get_kernel_work_group_size
875/// and get_kernel_preferred_work_group_size_multiple builtin functions.
876static bool SemaOpenCLBuiltinKernelWorkGroupSize(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
  return true;

Expr *BlockArg = TheCall->getArg(0);
if (!isBlockPointer(BlockArg)) {
  S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
      << TheCall->getDirectCallee() << "block";
  return true;
}
return checkOpenCLBlockArgs(S, BlockArg);
887}

889/// Diagnose integer type and any valid implicit conversion to it.
890static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E,
                                    const QualType &IntType);

893static bool checkOpenCLEnqueueLocalSizeArgs(Sema &S, CallExpr *TheCall,
                                          unsigned Start, unsigned End) {
bool IllegalParams = false;
for (unsigned I = Start; I <= End; ++I)
  IllegalParams |= checkOpenCLEnqueueIntType(S, TheCall->getArg(I),
                                            S.Context.getSizeType());
return IllegalParams;
900}

902/// OpenCL v2.0, s6.13.17.1 - Check that sizes are provided for all
903/// 'local void*' parameter of passed block.
904static bool checkOpenCLEnqueueVariadicArgs(Sema &S, CallExpr *TheCall,
                                         Expr *BlockArg,
                                         unsigned NumNonVarArgs) {
const BlockPointerType *BPT =
    cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
unsigned NumBlockParams =
    BPT->getPointeeType()->castAs<FunctionProtoType>()->getNumParams();
unsigned TotalNumArgs = TheCall->getNumArgs();

// For each argument passed to the block, a corresponding uint needs to
// be passed to describe the size of the local memory.
if (TotalNumArgs != NumBlockParams + NumNonVarArgs) {
  S.Diag(TheCall->getBeginLoc(),
         diag::err_opencl_enqueue_kernel_local_size_args);
  return true;
}

// Check that the sizes of the local memory are specified by integers.
return checkOpenCLEnqueueLocalSizeArgs(S, TheCall, NumNonVarArgs,
                                       TotalNumArgs - 1);
924}

926/// OpenCL C v2.0, s6.13.17 - Enqueue kernel function contains four different
927/// overload formats specified in Table 6.13.17.1.
928/// int enqueue_kernel(queue_t queue,
929///                    kernel_enqueue_flags_t flags,
930///                    const ndrange_t ndrange,
931///                    void (^block)(void))
932/// int enqueue_kernel(queue_t queue,
933///                    kernel_enqueue_flags_t flags,
934///                    const ndrange_t ndrange,
935///                    uint num_events_in_wait_list,
936///                    clk_event_t *event_wait_list,
937///                    clk_event_t *event_ret,
938///                    void (^block)(void))
939/// int enqueue_kernel(queue_t queue,
940///                    kernel_enqueue_flags_t flags,
941///                    const ndrange_t ndrange,
942///                    void (^block)(local void*, ...),
943///                    uint size0, ...)
944/// int enqueue_kernel(queue_t queue,
945///                    kernel_enqueue_flags_t flags,
946///                    const ndrange_t ndrange,
947///                    uint num_events_in_wait_list,
948///                    clk_event_t *event_wait_list,
949///                    clk_event_t *event_ret,
950///                    void (^block)(local void*, ...),
951///                    uint size0, ...)
952static bool SemaOpenCLBuiltinEnqueueKernel(Sema &S, CallExpr *TheCall) {
unsigned NumArgs = TheCall->getNumArgs();

if (NumArgs < 4) {
  S.Diag(TheCall->getBeginLoc(),
         diag::err_typecheck_call_too_few_args_at_least)
      << 0 << 4 << NumArgs;
  return true;
}

Expr *Arg0 = TheCall->getArg(0);
Expr *Arg1 = TheCall->getArg(1);
Expr *Arg2 = TheCall->getArg(2);
Expr *Arg3 = TheCall->getArg(3);

// First argument always needs to be a queue_t type.
if (!Arg0->getType()->isQueueT()) {
  S.Diag(TheCall->getArg(0)->getBeginLoc(),
         diag::err_opencl_builtin_expected_type)
      << TheCall->getDirectCallee() << S.Context.OCLQueueTy;
  return true;
}

// Second argument always needs to be a kernel_enqueue_flags_t enum value.
if (!Arg1->getType()->isIntegerType()) {
  S.Diag(TheCall->getArg(1)->getBeginLoc(),
         diag::err_opencl_builtin_expected_type)
      << TheCall->getDirectCallee() << "'kernel_enqueue_flags_t' (i.e. uint)";
  return true;
}

// Third argument is always an ndrange_t type.
if (Arg2->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
  S.Diag(TheCall->getArg(2)->getBeginLoc(),
         diag::err_opencl_builtin_expected_type)
      << TheCall->getDirectCallee() << "'ndrange_t'";
  return true;
}

// With four arguments, there is only one form that the function could be
// called in: no events and no variable arguments.
if (NumArgs == 4) {
  // check that the last argument is the right block type.
  if (!isBlockPointer(Arg3)) {
    S.Diag(Arg3->getBeginLoc(), diag::err_opencl_builtin_expected_type)
        << TheCall->getDirectCallee() << "block";
    return true;
  }
  // we have a block type, check the prototype
  const BlockPointerType *BPT =
      cast<BlockPointerType>(Arg3->getType().getCanonicalType());
  if (BPT->getPointeeType()->castAs<FunctionProtoType>()->getNumParams() > 0) {
    S.Diag(Arg3->getBeginLoc(),
           diag::err_opencl_enqueue_kernel_blocks_no_args);
    return true;
  }
  return false;
}
// we can have block + varargs.
if (isBlockPointer(Arg3))
  return (checkOpenCLBlockArgs(S, Arg3) ||
          checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg3, 4));
// last two cases with either exactly 7 args or 7 args and varargs.
if (NumArgs >= 7) {
  // check common block argument.
  Expr *Arg6 = TheCall->getArg(6);
  if (!isBlockPointer(Arg6)) {
    S.Diag(Arg6->getBeginLoc(), diag::err_opencl_builtin_expected_type)
        << TheCall->getDirectCallee() << "block";
    return true;
  }
  if (checkOpenCLBlockArgs(S, Arg6))
    return true;

  // Forth argument has to be any integer type.
  if (!Arg3->getType()->isIntegerType()) {
    S.Diag(TheCall->getArg(3)->getBeginLoc(),
           diag::err_opencl_builtin_expected_type)
        << TheCall->getDirectCallee() << "integer";
    return true;
  }
  // check remaining common arguments.
  Expr *Arg4 = TheCall->getArg(4);
  Expr *Arg5 = TheCall->getArg(5);

  // Fifth argument is always passed as a pointer to clk_event_t.
  if (!Arg4->isNullPointerConstant(S.Context,
                                   Expr::NPC_ValueDependentIsNotNull) &&
      !Arg4->getType()->getPointeeOrArrayElementType()->isClkEventT()) {
    S.Diag(TheCall->getArg(4)->getBeginLoc(),
           diag::err_opencl_builtin_expected_type)
        << TheCall->getDirectCallee()
        << S.Context.getPointerType(S.Context.OCLClkEventTy);
    return true;
  }

  // Sixth argument is always passed as a pointer to clk_event_t.
  if (!Arg5->isNullPointerConstant(S.Context,
                                   Expr::NPC_ValueDependentIsNotNull) &&
      !(Arg5->getType()->isPointerType() &&
        Arg5->getType()->getPointeeType()->isClkEventT())) {
    S.Diag(TheCall->getArg(5)->getBeginLoc(),
           diag::err_opencl_builtin_expected_type)
        << TheCall->getDirectCallee()
        << S.Context.getPointerType(S.Context.OCLClkEventTy);
    return true;
  }

  if (NumArgs == 7)
    return false;

  return checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg6, 7);
}

// None of the specific case has been detected, give generic error
S.Diag(TheCall->getBeginLoc(),
       diag::err_opencl_enqueue_kernel_incorrect_args);
return true;
1070}

1072/// Returns OpenCL access qual.
1073static OpenCLAccessAttr *getOpenCLArgAccess(const Decl *D) {
  return D->getAttr<OpenCLAccessAttr>();
1075}

1077/// Returns true if pipe element type is different from the pointer.
1078static bool checkOpenCLPipeArg(Sema &S, CallExpr *Call) {
const Expr *Arg0 = Call->getArg(0);
// First argument type should always be pipe.
if (!Arg0->getType()->isPipeType()) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
      << Call->getDirectCallee() << Arg0->getSourceRange();
  return true;
}
OpenCLAccessAttr *AccessQual =
    getOpenCLArgAccess(cast<DeclRefExpr>(Arg0)->getDecl());
// Validates the access qualifier is compatible with the call.
// OpenCL v2.0 s6.13.16 - The access qualifiers for pipe should only be
// read_only and write_only, and assumed to be read_only if no qualifier is
// specified.
switch (Call->getDirectCallee()->getBuiltinID()) {
case Builtin::BIread_pipe:
case Builtin::BIreserve_read_pipe:
case Builtin::BIcommit_read_pipe:
case Builtin::BIwork_group_reserve_read_pipe:
case Builtin::BIsub_group_reserve_read_pipe:
case Builtin::BIwork_group_commit_read_pipe:
case Builtin::BIsub_group_commit_read_pipe:
  if (!(!AccessQual || AccessQual->isReadOnly())) {
    S.Diag(Arg0->getBeginLoc(),
           diag::err_opencl_builtin_pipe_invalid_access_modifier)
        << "read_only" << Arg0->getSourceRange();
    return true;
  }
  break;
case Builtin::BIwrite_pipe:
case Builtin::BIreserve_write_pipe:
case Builtin::BIcommit_write_pipe:
case Builtin::BIwork_group_reserve_write_pipe:
case Builtin::BIsub_group_reserve_write_pipe:
case Builtin::BIwork_group_commit_write_pipe:
case Builtin::BIsub_group_commit_write_pipe:
  if (!(AccessQual && AccessQual->isWriteOnly())) {
    S.Diag(Arg0->getBeginLoc(),
           diag::err_opencl_builtin_pipe_invalid_access_modifier)
        << "write_only" << Arg0->getSourceRange();
    return true;
  }
  break;
default:
  break;
}
return false;
1125}

1127/// Returns true if pipe element type is different from the pointer.
1128static bool checkOpenCLPipePacketType(Sema &S, CallExpr *Call, unsigned Idx) {
const Expr *Arg0 = Call->getArg(0);
const Expr *ArgIdx = Call->getArg(Idx);
const PipeType *PipeTy = cast<PipeType>(Arg0->getType());
const QualType EltTy = PipeTy->getElementType();
const PointerType *ArgTy = ArgIdx->getType()->getAs<PointerType>();
// The Idx argument should be a pointer and the type of the pointer and
// the type of pipe element should also be the same.
if (!ArgTy ||
    !S.Context.hasSameType(
        EltTy, ArgTy->getPointeeType()->getCanonicalTypeInternal())) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
      << Call->getDirectCallee() << S.Context.getPointerType(EltTy)
      << ArgIdx->getType() << ArgIdx->getSourceRange();
  return true;
}
return false;
1145}

1147// Performs semantic analysis for the read/write_pipe call.
1148// \param S Reference to the semantic analyzer.
1149// \param Call A pointer to the builtin call.
1150// \return True if a semantic error has been found, false otherwise.
1151static bool SemaBuiltinRWPipe(Sema &S, CallExpr *Call) {
// OpenCL v2.0 s6.13.16.2 - The built-in read/write
// functions have two forms.
switch (Call->getNumArgs()) {
case 2:
  if (checkOpenCLPipeArg(S, Call))
    return true;
  // The call with 2 arguments should be
  // read/write_pipe(pipe T, T*).
  // Check packet type T.
  if (checkOpenCLPipePacketType(S, Call, 1))
    return true;
  break;

case 4: {
  if (checkOpenCLPipeArg(S, Call))
    return true;
  // The call with 4 arguments should be
  // read/write_pipe(pipe T, reserve_id_t, uint, T*).
  // Check reserve_id_t.
  if (!Call->getArg(1)->getType()->isReserveIDT()) {
    S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
        << Call->getDirectCallee() << S.Context.OCLReserveIDTy
        << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
    return true;
  }

  // Check the index.
  const Expr *Arg2 = Call->getArg(2);
  if (!Arg2->getType()->isIntegerType() &&
      !Arg2->getType()->isUnsignedIntegerType()) {
    S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
        << Call->getDirectCallee() << S.Context.UnsignedIntTy
        << Arg2->getType() << Arg2->getSourceRange();
    return true;
  }

  // Check packet type T.
  if (checkOpenCLPipePacketType(S, Call, 3))
    return true;
} break;
default:
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_arg_num)
      << Call->getDirectCallee() << Call->getSourceRange();
  return true;
}

return false;
1199}

1201// Performs a semantic analysis on the {work_group_/sub_group_
1202//        /_}reserve_{read/write}_pipe
1203// \param S Reference to the semantic analyzer.
1204// \param Call The call to the builtin function to be analyzed.
1205// \return True if a semantic error was found, false otherwise.
1206static bool SemaBuiltinReserveRWPipe(Sema &S, CallExpr *Call) {
if (checkArgCount(S, Call, 2))
  return true;

if (checkOpenCLPipeArg(S, Call))
  return true;

// Check the reserve size.
if (!Call->getArg(1)->getType()->isIntegerType() &&
    !Call->getArg(1)->getType()->isUnsignedIntegerType()) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
      << Call->getDirectCallee() << S.Context.UnsignedIntTy
      << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
  return true;
}

// Since return type of reserve_read/write_pipe built-in function is
// reserve_id_t, which is not defined in the builtin def file , we used int
// as return type and need to override the return type of these functions.
Call->setType(S.Context.OCLReserveIDTy);

return false;
1228}

1230// Performs a semantic analysis on {work_group_/sub_group_
1231//        /_}commit_{read/write}_pipe
1232// \param S Reference to the semantic analyzer.
1233// \param Call The call to the builtin function to be analyzed.
1234// \return True if a semantic error was found, false otherwise.
1235static bool SemaBuiltinCommitRWPipe(Sema &S, CallExpr *Call) {
if (checkArgCount(S, Call, 2))
  return true;

if (checkOpenCLPipeArg(S, Call))
  return true;

// Check reserve_id_t.
if (!Call->getArg(1)->getType()->isReserveIDT()) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
      << Call->getDirectCallee() << S.Context.OCLReserveIDTy
      << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
  return true;
}

return false;
1251}

1253// Performs a semantic analysis on the call to built-in Pipe
1254//        Query Functions.
1255// \param S Reference to the semantic analyzer.
1256// \param Call The call to the builtin function to be analyzed.
1257// \return True if a semantic error was found, false otherwise.
1258static bool SemaBuiltinPipePackets(Sema &S, CallExpr *Call) {
if (checkArgCount(S, Call, 1))
  return true;

if (!Call->getArg(0)->getType()->isPipeType()) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
      << Call->getDirectCallee() << Call->getArg(0)->getSourceRange();
  return true;
}

return false;
1269}

1271// OpenCL v2.0 s6.13.9 - Address space qualifier functions.
1272// Performs semantic analysis for the to_global/local/private call.
1273// \param S Reference to the semantic analyzer.
1274// \param BuiltinID ID of the builtin function.
1275// \param Call A pointer to the builtin call.
1276// \return True if a semantic error has been found, false otherwise.
1277static bool SemaOpenCLBuiltinToAddr(Sema &S, unsigned BuiltinID,
                                  CallExpr *Call) {
if (checkArgCount(S, Call, 1))
  return true;

auto RT = Call->getArg(0)->getType();
if (!RT->isPointerType() || RT->getPointeeType()
    .getAddressSpace() == LangAS::opencl_constant) {
  S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_to_addr_invalid_arg)
      << Call->getArg(0) << Call->getDirectCallee() << Call->getSourceRange();
  return true;
}

if (RT->getPointeeType().getAddressSpace() != LangAS::opencl_generic) {
  S.Diag(Call->getArg(0)->getBeginLoc(),
         diag::warn_opencl_generic_address_space_arg)
      << Call->getDirectCallee()->getNameInfo().getAsString()
      << Call->getArg(0)->getSourceRange();
}

RT = RT->getPointeeType();
auto Qual = RT.getQualifiers();
switch (BuiltinID) {
case Builtin::BIto_global:
  Qual.setAddressSpace(LangAS::opencl_global);
  break;
case Builtin::BIto_local:
  Qual.setAddressSpace(LangAS::opencl_local);
  break;
case Builtin::BIto_private:
  Qual.setAddressSpace(LangAS::opencl_private);
  break;
default:
  llvm_unreachable("Invalid builtin function")__builtin_unreachable();
}
Call->setType(S.Context.getPointerType(S.Context.getQualifiedType(
    RT.getUnqualifiedType(), Qual)));

return false;
1316}

1318static ExprResult SemaBuiltinLaunder(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
  return ExprError();

// Compute __builtin_launder's parameter type from the argument.
// The parameter type is:
//  * The type of the argument if it's not an array or function type,
//  Otherwise,
//  * The decayed argument type.
QualType ParamTy = [&]() {
  QualType ArgTy = TheCall->getArg(0)->getType();
  if (const ArrayType *Ty = ArgTy->getAsArrayTypeUnsafe())
    return S.Context.getPointerType(Ty->getElementType());
  if (ArgTy->isFunctionType()) {
    return S.Context.getPointerType(ArgTy);
  }
  return ArgTy;
}();

TheCall->setType(ParamTy);

auto DiagSelect = [&]() -> llvm::Optional<unsigned> {
  if (!ParamTy->isPointerType())
    return 0;
  if (ParamTy->isFunctionPointerType())
    return 1;
  if (ParamTy->isVoidPointerType())
    return 2;
  return llvm::Optional<unsigned>{};
}();
if (DiagSelect.hasValue()) {
  S.Diag(TheCall->getBeginLoc(), diag::err_builtin_launder_invalid_arg)
      << DiagSelect.getValue() << TheCall->getSourceRange();
  return ExprError();
}

// We either have an incomplete class type, or we have a class template
// whose instantiation has not been forced. Example:
//
//   template <class T> struct Foo { T value; };
//   Foo<int> *p = nullptr;
//   auto *d = __builtin_launder(p);
if (S.RequireCompleteType(TheCall->getBeginLoc(), ParamTy->getPointeeType(),
                          diag::err_incomplete_type))
  return ExprError();

assert(ParamTy->getPointeeType()->isObjectType() &&((void)0)
       "Unhandled non-object pointer case")((void)0);

InitializedEntity Entity =
    InitializedEntity::InitializeParameter(S.Context, ParamTy, false);
ExprResult Arg =
    S.PerformCopyInitialization(Entity, SourceLocation(), TheCall->getArg(0));
if (Arg.isInvalid())
  return ExprError();
TheCall->setArg(0, Arg.get());

return TheCall;
1376}

1378// Emit an error and return true if the current architecture is not in the list
1379// of supported architectures.
1380static bool
1381CheckBuiltinTargetSupport(Sema &S, unsigned BuiltinID, CallExpr *TheCall,
                        ArrayRef<llvm::Triple::ArchType> SupportedArchs) {
llvm::Triple::ArchType CurArch =
    S.getASTContext().getTargetInfo().getTriple().getArch();
if (llvm::is_contained(SupportedArchs, CurArch))
  return false;
S.Diag(TheCall->getBeginLoc(), diag::err_builtin_target_unsupported)
    << TheCall->getSourceRange();
return true;
1390}

1392static void CheckNonNullArgument(Sema &S, const Expr *ArgExpr,
                               SourceLocation CallSiteLoc);

1395bool Sema::CheckTSBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
                                    CallExpr *TheCall) {
switch (TI.getTriple().getArch()) {
default:
  // Some builtins don't require additional checking, so just consider these
  // acceptable.
  return false;
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
  return CheckARMBuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::aarch64:
case llvm::Triple::aarch64_32:
case llvm::Triple::aarch64_be:
  return CheckAArch64BuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::bpfeb:
case llvm::Triple::bpfel:
  return CheckBPFBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::hexagon:
  return CheckHexagonBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::mips:
case llvm::Triple::mipsel:
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
  return CheckMipsBuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::systemz:
  return CheckSystemZBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::x86:
case llvm::Triple::x86_64:
  return CheckX86BuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::ppc:
case llvm::Triple::ppcle:
case llvm::Triple::ppc64:
case llvm::Triple::ppc64le:
  return CheckPPCBuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::amdgcn:
  return CheckAMDGCNBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::riscv32:
case llvm::Triple::riscv64:
  return CheckRISCVBuiltinFunctionCall(TI, BuiltinID, TheCall);
}
1437}

1439ExprResult
1440Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
                             CallExpr *TheCall) {
ExprResult TheCallResult(TheCall);

// Find out if any arguments are required to be integer constant expressions.
unsigned ICEArguments = 0;
ASTContext::GetBuiltinTypeError Error;
Context.GetBuiltinType(BuiltinID, Error, &ICEArguments);
if (Error != ASTContext::GE_None)
  ICEArguments = 0;  // Don't diagnose previously diagnosed errors.

// If any arguments are required to be ICE's, check and diagnose.
for (unsigned ArgNo = 0; ICEArguments != 0; ++ArgNo) {
  // Skip arguments not required to be ICE's.
  if ((ICEArguments & (1 << ArgNo)) == 0) continue;

  llvm::APSInt Result;
  if (SemaBuiltinConstantArg(TheCall, ArgNo, Result))
    return true;
  ICEArguments &= ~(1 << ArgNo);
}

switch (BuiltinID) {
case Builtin::BI__builtin___CFStringMakeConstantString:
  assert(TheCall->getNumArgs() == 1 &&((void)0)
         "Wrong # arguments to builtin CFStringMakeConstantString")((void)0);
  if (CheckObjCString(TheCall->getArg(0)))
    return ExprError();
  break;
case Builtin::BI__builtin_ms_va_start:
case Builtin::BI__builtin_stdarg_start:
case Builtin::BI__builtin_va_start:
  if (SemaBuiltinVAStart(BuiltinID, TheCall))
    return ExprError();
  break;
case Builtin::BI__va_start: {
  switch (Context.getTargetInfo().getTriple().getArch()) {
  case llvm::Triple::aarch64:
  case llvm::Triple::arm:
  case llvm::Triple::thumb:
    if (SemaBuiltinVAStartARMMicrosoft(TheCall))
      return ExprError();
    break;
  default:
    if (SemaBuiltinVAStart(BuiltinID, TheCall))
      return ExprError();
    break;
  }
  break;
}

// The acquire, release, and no fence variants are ARM and AArch64 only.
case Builtin::BI_interlockedbittestandset_acq:
case Builtin::BI_interlockedbittestandset_rel:
case Builtin::BI_interlockedbittestandset_nf:
case Builtin::BI_interlockedbittestandreset_acq:
case Builtin::BI_interlockedbittestandreset_rel:
case Builtin::BI_interlockedbittestandreset_nf:
  if (CheckBuiltinTargetSupport(
          *this, BuiltinID, TheCall,
          {llvm::Triple::arm, llvm::Triple::thumb, llvm::Triple::aarch64}))
    return ExprError();
  break;

// The 64-bit bittest variants are x64, ARM, and AArch64 only.
case Builtin::BI_bittest64:
case Builtin::BI_bittestandcomplement64:
case Builtin::BI_bittestandreset64:
case Builtin::BI_bittestandset64:
case Builtin::BI_interlockedbittestandreset64:
case Builtin::BI_interlockedbittestandset64:
  if (CheckBuiltinTargetSupport(*this, BuiltinID, TheCall,
                                {llvm::Triple::x86_64, llvm::Triple::arm,
                                 llvm::Triple::thumb, llvm::Triple::aarch64}))
    return ExprError();
  break;

case Builtin::BI__builtin_isgreater:
case Builtin::BI__builtin_isgreaterequal:
case Builtin::BI__builtin_isless:
case Builtin::BI__builtin_islessequal:
case Builtin::BI__builtin_islessgreater:
case Builtin::BI__builtin_isunordered:
  if (SemaBuiltinUnorderedCompare(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_fpclassify:
  if (SemaBuiltinFPClassification(TheCall, 6))
    return ExprError();
  break;
case Builtin::BI__builtin_isfinite:
case Builtin::BI__builtin_isinf:
case Builtin::BI__builtin_isinf_sign:
case Builtin::BI__builtin_isnan:
case Builtin::BI__builtin_isnormal:
case Builtin::BI__builtin_signbit:
case Builtin::BI__builtin_signbitf:
case Builtin::BI__builtin_signbitl:
  if (SemaBuiltinFPClassification(TheCall, 1))
    return ExprError();
  break;
case Builtin::BI__builtin_shufflevector:
  return SemaBuiltinShuffleVector(TheCall);
  // TheCall will be freed by the smart pointer here, but that's fine, since
  // SemaBuiltinShuffleVector guts it, but then doesn't release it.
case Builtin::BI__builtin_prefetch:
  if (SemaBuiltinPrefetch(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_alloca_with_align:
  if (SemaBuiltinAllocaWithAlign(TheCall))
    return ExprError();
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Builtin::BI__builtin_alloca:
  Diag(TheCall->getBeginLoc(), diag::warn_alloca)
      << TheCall->getDirectCallee();
  break;
case Builtin::BI__arithmetic_fence:
  if (SemaBuiltinArithmeticFence(TheCall))
    return ExprError();
  break;
case Builtin::BI__assume:
case Builtin::BI__builtin_assume:
  if (SemaBuiltinAssume(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_assume_aligned:
  if (SemaBuiltinAssumeAligned(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_dynamic_object_size:
case Builtin::BI__builtin_object_size:
  if (SemaBuiltinConstantArgRange(TheCall, 1, 0, 3))
    return ExprError();
  break;
case Builtin::BI__builtin_longjmp:
  if (SemaBuiltinLongjmp(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_setjmp:
  if (SemaBuiltinSetjmp(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_classify_type:
  if (checkArgCount(*this, TheCall, 1)) return true;
  TheCall->setType(Context.IntTy);
  break;
case Builtin::BI__builtin_complex:
  if (SemaBuiltinComplex(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_constant_p: {
  if (checkArgCount(*this, TheCall, 1)) return true;
  ExprResult Arg = DefaultFunctionArrayLvalueConversion(TheCall->getArg(0));
  if (Arg.isInvalid()) return true;
  TheCall->setArg(0, Arg.get());
  TheCall->setType(Context.IntTy);
  break;
}
case Builtin::BI__builtin_launder:
  return SemaBuiltinLaunder(*this, TheCall);
case Builtin::BI__sync_fetch_and_add:
case Builtin::BI__sync_fetch_and_add_1:
case Builtin::BI__sync_fetch_and_add_2:
case Builtin::BI__sync_fetch_and_add_4:
case Builtin::BI__sync_fetch_and_add_8:
case Builtin::BI__sync_fetch_and_add_16:
case Builtin::BI__sync_fetch_and_sub:
case Builtin::BI__sync_fetch_and_sub_1:
case Builtin::BI__sync_fetch_and_sub_2:
case Builtin::BI__sync_fetch_and_sub_4:
case Builtin::BI__sync_fetch_and_sub_8:
case Builtin::BI__sync_fetch_and_sub_16:
case Builtin::BI__sync_fetch_and_or:
case Builtin::BI__sync_fetch_and_or_1:
case Builtin::BI__sync_fetch_and_or_2:
case Builtin::BI__sync_fetch_and_or_4:
case Builtin::BI__sync_fetch_and_or_8:
case Builtin::BI__sync_fetch_and_or_16:
case Builtin::BI__sync_fetch_and_and:
case Builtin::BI__sync_fetch_and_and_1:
case Builtin::BI__sync_fetch_and_and_2:
case Builtin::BI__sync_fetch_and_and_4:
case Builtin::BI__sync_fetch_and_and_8:
case Builtin::BI__sync_fetch_and_and_16:
case Builtin::BI__sync_fetch_and_xor:
case Builtin::BI__sync_fetch_and_xor_1:
case Builtin::BI__sync_fetch_and_xor_2:
case Builtin::BI__sync_fetch_and_xor_4:
case Builtin::BI__sync_fetch_and_xor_8:
case Builtin::BI__sync_fetch_and_xor_16:
case Builtin::BI__sync_fetch_and_nand:
case Builtin::BI__sync_fetch_and_nand_1:
case Builtin::BI__sync_fetch_and_nand_2:
case Builtin::BI__sync_fetch_and_nand_4:
case Builtin::BI__sync_fetch_and_nand_8:
case Builtin::BI__sync_fetch_and_nand_16:
case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_add_and_fetch_1:
case Builtin::BI__sync_add_and_fetch_2:
case Builtin::BI__sync_add_and_fetch_4:
case Builtin::BI__sync_add_and_fetch_8:
case Builtin::BI__sync_add_and_fetch_16:
case Builtin::BI__sync_sub_and_fetch:
case Builtin::BI__sync_sub_and_fetch_1:
case Builtin::BI__sync_sub_and_fetch_2:
case Builtin::BI__sync_sub_and_fetch_4:
case Builtin::BI__sync_sub_and_fetch_8:
case Builtin::BI__sync_sub_and_fetch_16:
case Builtin::BI__sync_and_and_fetch:
case Builtin::BI__sync_and_and_fetch_1:
case Builtin::BI__sync_and_and_fetch_2:
case Builtin::BI__sync_and_and_fetch_4:
case Builtin::BI__sync_and_and_fetch_8:
case Builtin::BI__sync_and_and_fetch_16:
case Builtin::BI__sync_or_and_fetch:
case Builtin::BI__sync_or_and_fetch_1:
case Builtin::BI__sync_or_and_fetch_2:
case Builtin::BI__sync_or_and_fetch_4:
case Builtin::BI__sync_or_and_fetch_8:
case Builtin::BI__sync_or_and_fetch_16:
case Builtin::BI__sync_xor_and_fetch:
case Builtin::BI__sync_xor_and_fetch_1:
case Builtin::BI__sync_xor_and_fetch_2:
case Builtin::BI__sync_xor_and_fetch_4:
case Builtin::BI__sync_xor_and_fetch_8:
case Builtin::BI__sync_xor_and_fetch_16:
case Builtin::BI__sync_nand_and_fetch:
case Builtin::BI__sync_nand_and_fetch_1:
case Builtin::BI__sync_nand_and_fetch_2:
case Builtin::BI__sync_nand_and_fetch_4:
case Builtin::BI__sync_nand_and_fetch_8:
case Builtin::BI__sync_nand_and_fetch_16:
case Builtin::BI__sync_val_compare_and_swap:
case Builtin::BI__sync_val_compare_and_swap_1:
case Builtin::BI__sync_val_compare_and_swap_2:
case Builtin::BI__sync_val_compare_and_swap_4:
case Builtin::BI__sync_val_compare_and_swap_8:
case Builtin::BI__sync_val_compare_and_swap_16:
case Builtin::BI__sync_bool_compare_and_swap:
case Builtin::BI__sync_bool_compare_and_swap_1:
case Builtin::BI__sync_bool_compare_and_swap_2:
case Builtin::BI__sync_bool_compare_and_swap_4:
case Builtin::BI__sync_bool_compare_and_swap_8:
case Builtin::BI__sync_bool_compare_and_swap_16:
case Builtin::BI__sync_lock_test_and_set:
case Builtin::BI__sync_lock_test_and_set_1:
case Builtin::BI__sync_lock_test_and_set_2:
case Builtin::BI__sync_lock_test_and_set_4:
case Builtin::BI__sync_lock_test_and_set_8:
case Builtin::BI__sync_lock_test_and_set_16:
case Builtin::BI__sync_lock_release:
case Builtin::BI__sync_lock_release_1:
case Builtin::BI__sync_lock_release_2:
case Builtin::BI__sync_lock_release_4:
case Builtin::BI__sync_lock_release_8:
case Builtin::BI__sync_lock_release_16:
case Builtin::BI__sync_swap:
case Builtin::BI__sync_swap_1:
case Builtin::BI__sync_swap_2:
case Builtin::BI__sync_swap_4:
case Builtin::BI__sync_swap_8:
case Builtin::BI__sync_swap_16:
  return SemaBuiltinAtomicOverloaded(TheCallResult);
case Builtin::BI__sync_synchronize:
  Diag(TheCall->getBeginLoc(), diag::warn_atomic_implicit_seq_cst)
      << TheCall->getCallee()->getSourceRange();
  break;
case Builtin::BI__builtin_nontemporal_load:
case Builtin::BI__builtin_nontemporal_store:
  return SemaBuiltinNontemporalOverloaded(TheCallResult);
case Builtin::BI__builtin_memcpy_inline: {
  clang::Expr *SizeOp = TheCall->getArg(2);
  // We warn about copying to or from `nullptr` pointers when `size` is
  // greater than 0. When `size` is value dependent we cannot evaluate its
  // value so we bail out.
  if (SizeOp->isValueDependent())
    break;
  if (!SizeOp->EvaluateKnownConstInt(Context).isNullValue()) {
    CheckNonNullArgument(*this, TheCall->getArg(0), TheCall->getExprLoc());
    CheckNonNullArgument(*this, TheCall->getArg(1), TheCall->getExprLoc());
  }
  break;
}
1724#define BUILTIN(ID, TYPE, ATTRS)
1725#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) \
case Builtin::BI##ID: \
  return SemaAtomicOpsOverloaded(TheCallResult, AtomicExpr::AO##ID);
1728#include "clang/Basic/Builtins.def"
case Builtin::BI__annotation:
  if (SemaBuiltinMSVCAnnotation(*this, TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_annotation:
  if (SemaBuiltinAnnotation(*this, TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_addressof:
  if (SemaBuiltinAddressof(*this, TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_is_aligned:
case Builtin::BI__builtin_align_up:
case Builtin::BI__builtin_align_down:
  if (SemaBuiltinAlignment(*this, TheCall, BuiltinID))
    return ExprError();
  break;
case Builtin::BI__builtin_add_overflow:
case Builtin::BI__builtin_sub_overflow:
case Builtin::BI__builtin_mul_overflow:
  if (SemaBuiltinOverflow(*this, TheCall, BuiltinID))
    return ExprError();
  break;
case Builtin::BI__builtin_operator_new:
case Builtin::BI__builtin_operator_delete: {
  bool IsDelete = BuiltinID == Builtin::BI__builtin_operator_delete;
  ExprResult Res =
      SemaBuiltinOperatorNewDeleteOverloaded(TheCallResult, IsDelete);
  if (Res.isInvalid())
    CorrectDelayedTyposInExpr(TheCallResult.get());
  return Res;
}
case Builtin::BI__builtin_dump_struct: {
  // We first want to ensure we are called with 2 arguments
  if (checkArgCount(*this, TheCall, 2))
    return ExprError();
  // Ensure that the first argument is of type 'struct XX *'
  const Expr *PtrArg = TheCall->getArg(0)->IgnoreParenImpCasts();
  const QualType PtrArgType = PtrArg->getType();
  if (!PtrArgType->isPointerType() ||
      !PtrArgType->getPointeeType()->isRecordType()) {
    Diag(PtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
        << PtrArgType << "structure pointer" << 1 << 0 << 3 << 1 << PtrArgType
        << "structure pointer";
    return ExprError();
  }

  // Ensure that the second argument is of type 'FunctionType'
  const Expr *FnPtrArg = TheCall->getArg(1)->IgnoreImpCasts();
  const QualType FnPtrArgType = FnPtrArg->getType();
  if (!FnPtrArgType->isPointerType()) {
    Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
        << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
        << FnPtrArgType << "'int (*)(const char *, ...)'";
    return ExprError();
  }

  const auto *FuncType =
      FnPtrArgType->getPointeeType()->getAs<FunctionType>();

  if (!FuncType) {
    Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
        << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
        << FnPtrArgType << "'int (*)(const char *, ...)'";
    return ExprError();
  }

  if (const auto *FT = dyn_cast<FunctionProtoType>(FuncType)) {
    if (!FT->getNumParams()) {
      Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
          << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
          << 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
      return ExprError();
    }
    QualType PT = FT->getParamType(0);
    if (!FT->isVariadic() || FT->getReturnType() != Context.IntTy ||
        !PT->isPointerType() || !PT->getPointeeType()->isCharType() ||
        !PT->getPointeeType().isConstQualified()) {
      Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
          << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
          << 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
      return ExprError();
    }
  }

  TheCall->setType(Context.IntTy);
  break;
}
case Builtin::BI__builtin_expect_with_probability: {
  // We first want to ensure we are called with 3 arguments
  if (checkArgCount(*this, TheCall, 3))
    return ExprError();
  // then check probability is constant float in range [0.0, 1.0]
  const Expr *ProbArg = TheCall->getArg(2);
  SmallVector<PartialDiagnosticAt, 8> Notes;
  Expr::EvalResult Eval;
  Eval.Diag = &Notes;
  if ((!ProbArg->EvaluateAsConstantExpr(Eval, Context)) ||
      !Eval.Val.isFloat()) {
    Diag(ProbArg->getBeginLoc(), diag::err_probability_not_constant_float)
        << ProbArg->getSourceRange();
    for (const PartialDiagnosticAt &PDiag : Notes)
      Diag(PDiag.first, PDiag.second);
    return ExprError();
  }
  llvm::APFloat Probability = Eval.Val.getFloat();
  bool LoseInfo = false;
  Probability.convert(llvm::APFloat::IEEEdouble(),
                      llvm::RoundingMode::Dynamic, &LoseInfo);
  if (!(Probability >= llvm::APFloat(0.0) &&
        Probability <= llvm::APFloat(1.0))) {
    Diag(ProbArg->getBeginLoc(), diag::err_probability_out_of_range)
        << ProbArg->getSourceRange();
    return ExprError();
  }
  break;
}
case Builtin::BI__builtin_preserve_access_index:
  if (SemaBuiltinPreserveAI(*this, TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_call_with_static_chain:
  if (SemaBuiltinCallWithStaticChain(*this, TheCall))
    return ExprError();
  break;
case Builtin::BI__exception_code:
case Builtin::BI_exception_code:
  if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHExceptScope,
                               diag::err_seh___except_block))
    return ExprError();
  break;
case Builtin::BI__exception_info:
case Builtin::BI_exception_info:
  if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHFilterScope,
                               diag::err_seh___except_filter))
    return ExprError();
  break;
case Builtin::BI__GetExceptionInfo:
  if (checkArgCount(*this, TheCall, 1))
    return ExprError();

  if (CheckCXXThrowOperand(
          TheCall->getBeginLoc(),
          Context.getExceptionObjectType(FDecl->getParamDecl(0)->getType()),
          TheCall))
    return ExprError();

  TheCall->setType(Context.VoidPtrTy);
  break;
// OpenCL v2.0, s6.13.16 - Pipe functions
case Builtin::BIread_pipe:
case Builtin::BIwrite_pipe:
  // Since those two functions are declared with var args, we need a semantic
  // check for the argument.
  if (SemaBuiltinRWPipe(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIreserve_read_pipe:
case Builtin::BIreserve_write_pipe:
case Builtin::BIwork_group_reserve_read_pipe:
case Builtin::BIwork_group_reserve_write_pipe:
  if (SemaBuiltinReserveRWPipe(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIsub_group_reserve_read_pipe:
case Builtin::BIsub_group_reserve_write_pipe:
  if (checkOpenCLSubgroupExt(*this, TheCall) ||
      SemaBuiltinReserveRWPipe(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIcommit_read_pipe:
case Builtin::BIcommit_write_pipe:
case Builtin::BIwork_group_commit_read_pipe:
case Builtin::BIwork_group_commit_write_pipe:
  if (SemaBuiltinCommitRWPipe(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIsub_group_commit_read_pipe:
case Builtin::BIsub_group_commit_write_pipe:
  if (checkOpenCLSubgroupExt(*this, TheCall) ||
      SemaBuiltinCommitRWPipe(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIget_pipe_num_packets:
case Builtin::BIget_pipe_max_packets:
  if (SemaBuiltinPipePackets(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIto_global:
case Builtin::BIto_local:
case Builtin::BIto_private:
  if (SemaOpenCLBuiltinToAddr(*this, BuiltinID, TheCall))
    return ExprError();
  break;
// OpenCL v2.0, s6.13.17 - Enqueue kernel functions.
case Builtin::BIenqueue_kernel:
  if (SemaOpenCLBuiltinEnqueueKernel(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIget_kernel_work_group_size:
case Builtin::BIget_kernel_preferred_work_group_size_multiple:
  if (SemaOpenCLBuiltinKernelWorkGroupSize(*this, TheCall))
    return ExprError();
  break;
case Builtin::BIget_kernel_max_sub_group_size_for_ndrange:
case Builtin::BIget_kernel_sub_group_count_for_ndrange:
  if (SemaOpenCLBuiltinNDRangeAndBlock(*this, TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_os_log_format:
  Cleanup.setExprNeedsCleanups(true);
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Builtin::BI__builtin_os_log_format_buffer_size:
  if (SemaBuiltinOSLogFormat(TheCall))
    return ExprError();
  break;
case Builtin::BI__builtin_frame_address:
case Builtin::BI__builtin_return_address: {
  if (SemaBuiltinConstantArgRange(TheCall, 0, 0, 0xFFFF))
    return ExprError();

  // -Wframe-address warning if non-zero passed to builtin
  // return/frame address.
  Expr::EvalResult Result;
  if (!TheCall->getArg(0)->isValueDependent() &&
      TheCall->getArg(0)->EvaluateAsInt(Result, getASTContext()) &&
      Result.Val.getInt() != 0)
    Diag(TheCall->getBeginLoc(), diag::warn_frame_address)
        << ((BuiltinID == Builtin::BI__builtin_return_address)
                ? "__builtin_return_address"
                : "__builtin_frame_address")
        << TheCall->getSourceRange();
  break;
}

case Builtin::BI__builtin_matrix_transpose:
  return SemaBuiltinMatrixTranspose(TheCall, TheCallResult);

case Builtin::BI__builtin_matrix_column_major_load:
  return SemaBuiltinMatrixColumnMajorLoad(TheCall, TheCallResult);

case Builtin::BI__builtin_matrix_column_major_store:
  return SemaBuiltinMatrixColumnMajorStore(TheCall, TheCallResult);

case Builtin::BI__builtin_get_device_side_mangled_name: {
  auto Check = [](CallExpr *TheCall) {
    if (TheCall->getNumArgs() != 1)
      return false;
    auto *DRE = dyn_cast<DeclRefExpr>(TheCall->getArg(0)->IgnoreImpCasts());
    if (!DRE)
      return false;
    auto *D = DRE->getDecl();
    if (!isa<FunctionDecl>(D) && !isa<VarDecl>(D))
      return false;
    return D->hasAttr<CUDAGlobalAttr>() || D->hasAttr<CUDADeviceAttr>() ||
           D->hasAttr<CUDAConstantAttr>() || D->hasAttr<HIPManagedAttr>();
  };
  if (!Check(TheCall)) {
    Diag(TheCall->getBeginLoc(),
         diag::err_hip_invalid_args_builtin_mangled_name);
    return ExprError();
  }
}
}

// Since the target specific builtins for each arch overlap, only check those
// of the arch we are compiling for.
if (Context.BuiltinInfo.isTSBuiltin(BuiltinID)) {
  if (Context.BuiltinInfo.isAuxBuiltinID(BuiltinID)) {
    assert(Context.getAuxTargetInfo() &&((void)0)
           "Aux Target Builtin, but not an aux target?")((void)0);

    if (CheckTSBuiltinFunctionCall(
            *Context.getAuxTargetInfo(),
            Context.BuiltinInfo.getAuxBuiltinID(BuiltinID), TheCall))
      return ExprError();
  } else {
    if (CheckTSBuiltinFunctionCall(Context.getTargetInfo(), BuiltinID,
                                   TheCall))
      return ExprError();
  }
}

return TheCallResult;
2014}

2016// Get the valid immediate range for the specified NEON type code.
2017static unsigned RFT(unsigned t, bool shift = false, bool ForceQuad = false) {
NeonTypeFlags Type(t);
int IsQuad = ForceQuad ? true : Type.isQuad();
switch (Type.getEltType()) {
case NeonTypeFlags::Int8:
case NeonTypeFlags::Poly8:
  return shift ? 7 : (8 << IsQuad) - 1;
case NeonTypeFlags::Int16:
case NeonTypeFlags::Poly16:
  return shift ? 15 : (4 << IsQuad) - 1;
case NeonTypeFlags::Int32:
  return shift ? 31 : (2 << IsQuad) - 1;
case NeonTypeFlags::Int64:
case NeonTypeFlags::Poly64:
  return shift ? 63 : (1 << IsQuad) - 1;
case NeonTypeFlags::Poly128:
  return shift ? 127 : (1 << IsQuad) - 1;
case NeonTypeFlags::Float16:
  assert(!shift && "cannot shift float types!")((void)0);
  return (4 << IsQuad) - 1;
case NeonTypeFlags::Float32:
  assert(!shift && "cannot shift float types!")((void)0);
  return (2 << IsQuad) - 1;
case NeonTypeFlags::Float64:
  assert(!shift && "cannot shift float types!")((void)0);
  return (1 << IsQuad) - 1;
case NeonTypeFlags::BFloat16:
  assert(!shift && "cannot shift float types!")((void)0);
  return (4 << IsQuad) - 1;
}
llvm_unreachable("Invalid NeonTypeFlag!")__builtin_unreachable();
2048}

2050/// getNeonEltType - Return the QualType corresponding to the elements of
2051/// the vector type specified by the NeonTypeFlags.  This is used to check
2052/// the pointer arguments for Neon load/store intrinsics.
2053static QualType getNeonEltType(NeonTypeFlags Flags, ASTContext &Context,
                             bool IsPolyUnsigned, bool IsInt64Long) {
switch (Flags.getEltType()) {
case NeonTypeFlags::Int8:
  return Flags.isUnsigned() ? Context.UnsignedCharTy : Context.SignedCharTy;
case NeonTypeFlags::Int16:
  return Flags.isUnsigned() ? Context.UnsignedShortTy : Context.ShortTy;
case NeonTypeFlags::Int32:
  return Flags.isUnsigned() ? Context.UnsignedIntTy : Context.IntTy;
case NeonTypeFlags::Int64:
  if (IsInt64Long)
    return Flags.isUnsigned() ? Context.UnsignedLongTy : Context.LongTy;
  else
    return Flags.isUnsigned() ? Context.UnsignedLongLongTy
                              : Context.LongLongTy;
case NeonTypeFlags::Poly8:
  return IsPolyUnsigned ? Context.UnsignedCharTy : Context.SignedCharTy;
case NeonTypeFlags::Poly16:
  return IsPolyUnsigned ? Context.UnsignedShortTy : Context.ShortTy;
case NeonTypeFlags::Poly64:
  if (IsInt64Long)
    return Context.UnsignedLongTy;
  else
    return Context.UnsignedLongLongTy;
case NeonTypeFlags::Poly128:
  break;
case NeonTypeFlags::Float16:
  return Context.HalfTy;
case NeonTypeFlags::Float32:
  return Context.FloatTy;
case NeonTypeFlags::Float64:
  return Context.DoubleTy;
case NeonTypeFlags::BFloat16:
  return Context.BFloat16Ty;
}
llvm_unreachable("Invalid NeonTypeFlag!")__builtin_unreachable();
2089}

2091bool Sema::CheckSVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
// Range check SVE intrinsics that take immediate values.
SmallVector<std::tuple<int,int,int>, 3> ImmChecks;

switch (BuiltinID) {
default:
  return false;
2098#define GET_SVE_IMMEDIATE_CHECK
2099#include "clang/Basic/arm_sve_sema_rangechecks.inc"
2100#undef GET_SVE_IMMEDIATE_CHECK
}

// Perform all the immediate checks for this builtin call.
bool HasError = false;
for (auto &I : ImmChecks) {
  int ArgNum, CheckTy, ElementSizeInBits;
  std::tie(ArgNum, CheckTy, ElementSizeInBits) = I;

  typedef bool(*OptionSetCheckFnTy)(int64_t Value);

  // Function that checks whether the operand (ArgNum) is an immediate
  // that is one of the predefined values.
  auto CheckImmediateInSet = [&](OptionSetCheckFnTy CheckImm,
                                 int ErrDiag) -> bool {
    // We can't check the value of a dependent argument.
    Expr *Arg = TheCall->getArg(ArgNum);
    if (Arg->isTypeDependent() || Arg->isValueDependent())
      return false;

    // Check constant-ness first.
    llvm::APSInt Imm;
    if (SemaBuiltinConstantArg(TheCall, ArgNum, Imm))
      return true;

    if (!CheckImm(Imm.getSExtValue()))
      return Diag(TheCall->getBeginLoc(), ErrDiag) << Arg->getSourceRange();
    return false;
  };

  switch ((SVETypeFlags::ImmCheckType)CheckTy) {
  case SVETypeFlags::ImmCheck0_31:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 31))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheck0_13:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 13))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheck1_16:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 1, 16))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheck0_7:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 7))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckExtract:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
                                    (2048 / ElementSizeInBits) - 1))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckShiftRight:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 1, ElementSizeInBits))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckShiftRightNarrow:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 1,
                                    ElementSizeInBits / 2))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckShiftLeft:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
                                    ElementSizeInBits - 1))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckLaneIndex:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
                                    (128 / (1 * ElementSizeInBits)) - 1))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckLaneIndexCompRotate:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
                                    (128 / (2 * ElementSizeInBits)) - 1))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckLaneIndexDot:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
                                    (128 / (4 * ElementSizeInBits)) - 1))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckComplexRot90_270:
    if (CheckImmediateInSet([](int64_t V) { return V == 90 || V == 270; },
                            diag::err_rotation_argument_to_cadd))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheckComplexRotAll90:
    if (CheckImmediateInSet(
            [](int64_t V) {
              return V == 0 || V == 90 || V == 180 || V == 270;
            },
            diag::err_rotation_argument_to_cmla))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheck0_1:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 1))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheck0_2:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 2))
      HasError = true;
    break;
  case SVETypeFlags::ImmCheck0_3:
    if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 3))
      HasError = true;
    break;
  }
}

return HasError;
2210}

2212bool Sema::CheckNeonBuiltinFunctionCall(const TargetInfo &TI,
                                      unsigned BuiltinID, CallExpr *TheCall) {
llvm::APSInt Result;
uint64_t mask = 0;
unsigned TV = 0;
int PtrArgNum = -1;
bool HasConstPtr = false;
switch (BuiltinID) {
2220#define GET_NEON_OVERLOAD_CHECK
2221#include "clang/Basic/arm_neon.inc"
2222#include "clang/Basic/arm_fp16.inc"
2223#undef GET_NEON_OVERLOAD_CHECK
}

// For NEON intrinsics which are overloaded on vector element type, validate
// the immediate which specifies which variant to emit.
unsigned ImmArg = TheCall->getNumArgs()-1;
if (mask) {
  if (SemaBuiltinConstantArg(TheCall, ImmArg, Result))
    return true;

  TV = Result.getLimitedValue(64);
  if ((TV > 63) || (mask & (1ULL << TV)) == 0)
    return Diag(TheCall->getBeginLoc(), diag::err_invalid_neon_type_code)
           << TheCall->getArg(ImmArg)->getSourceRange();
}

if (PtrArgNum >= 0) {
  // Check that pointer arguments have the specified type.
  Expr *Arg = TheCall->getArg(PtrArgNum);
  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg))
    Arg = ICE->getSubExpr();
  ExprResult RHS = DefaultFunctionArrayLvalueConversion(Arg);
  QualType RHSTy = RHS.get()->getType();

  llvm::Triple::ArchType Arch = TI.getTriple().getArch();
  bool IsPolyUnsigned = Arch == llvm::Triple::aarch64 ||
                        Arch == llvm::Triple::aarch64_32 ||
                        Arch == llvm::Triple::aarch64_be;
  bool IsInt64Long = TI.getInt64Type() == TargetInfo::SignedLong;
  QualType EltTy =
      getNeonEltType(NeonTypeFlags(TV), Context, IsPolyUnsigned, IsInt64Long);
  if (HasConstPtr)
    EltTy = EltTy.withConst();
  QualType LHSTy = Context.getPointerType(EltTy);
  AssignConvertType ConvTy;
  ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
  if (RHS.isInvalid())
    return true;
  if (DiagnoseAssignmentResult(ConvTy, Arg->getBeginLoc(), LHSTy, RHSTy,
                               RHS.get(), AA_Assigning))
    return true;
}

// For NEON intrinsics which take an immediate value as part of the
// instruction, range check them here.
unsigned i = 0, l = 0, u = 0;
switch (BuiltinID) {
default:
  return false;
#define GET_NEON_IMMEDIATE_CHECK
#include "clang/Basic/arm_neon.inc"
#include "clang/Basic/arm_fp16.inc"
#undef GET_NEON_IMMEDIATE_CHECK
}

return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
2279}

2281bool Sema::CheckMVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
switch (BuiltinID) {
default:
  return false;
#include "clang/Basic/arm_mve_builtin_sema.inc"
}
2287}

2289bool Sema::CheckCDEBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
                                     CallExpr *TheCall) {
bool Err = false;
switch (BuiltinID) {
default:
  return false;
2295#include "clang/Basic/arm_cde_builtin_sema.inc"
}

if (Err)
  return true;

return CheckARMCoprocessorImmediate(TI, TheCall->getArg(0), /*WantCDE*/ true);
2302}

2304bool Sema::CheckARMCoprocessorImmediate(const TargetInfo &TI,
                                      const Expr *CoprocArg, bool WantCDE) {
if (isConstantEvaluated())
  return false;

// We can't check the value of a dependent argument.
if (CoprocArg->isTypeDependent() || CoprocArg->isValueDependent())
  return false;

llvm::APSInt CoprocNoAP = *CoprocArg->getIntegerConstantExpr(Context);
int64_t CoprocNo = CoprocNoAP.getExtValue();
assert(CoprocNo >= 0 && "Coprocessor immediate must be non-negative")((void)0);

uint32_t CDECoprocMask = TI.getARMCDECoprocMask();
bool IsCDECoproc = CoprocNo <= 7 && (CDECoprocMask & (1 << CoprocNo));

if (IsCDECoproc != WantCDE)
  return Diag(CoprocArg->getBeginLoc(), diag::err_arm_invalid_coproc)
         << (int)CoprocNo << (int)WantCDE << CoprocArg->getSourceRange();

return false;
2325}

2327bool Sema::CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
                                      unsigned MaxWidth) {
assert((BuiltinID == ARM::BI__builtin_arm_ldrex ||((void)0)
        BuiltinID == ARM::BI__builtin_arm_ldaex ||((void)0)
        BuiltinID == ARM::BI__builtin_arm_strex ||((void)0)
        BuiltinID == ARM::BI__builtin_arm_stlex ||((void)0)
        BuiltinID == AArch64::BI__builtin_arm_ldrex ||((void)0)
        BuiltinID == AArch64::BI__builtin_arm_ldaex ||((void)0)
        BuiltinID == AArch64::BI__builtin_arm_strex ||((void)0)
        BuiltinID == AArch64::BI__builtin_arm_stlex) &&((void)0)
       "unexpected ARM builtin")((void)0);
bool IsLdrex = BuiltinID == ARM::BI__builtin_arm_ldrex ||
               BuiltinID == ARM::BI__builtin_arm_ldaex ||
               BuiltinID == AArch64::BI__builtin_arm_ldrex ||
               BuiltinID == AArch64::BI__builtin_arm_ldaex;

DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());

// Ensure that we have the proper number of arguments.
if (checkArgCount(*this, TheCall, IsLdrex ? 1 : 2))
  return true;

// Inspect the pointer argument of the atomic builtin.  This should always be
// a pointer type, whose element is an integral scalar or pointer type.
// Because it is a pointer type, we don't have to worry about any implicit
// casts here.
Expr *PointerArg = TheCall->getArg(IsLdrex ? 0 : 1);
ExprResult PointerArgRes = DefaultFunctionArrayLvalueConversion(PointerArg);
if (PointerArgRes.isInvalid())
  return true;
PointerArg = PointerArgRes.get();

const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
if (!pointerType) {
  Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
      << PointerArg->getType() << PointerArg->getSourceRange();
  return true;
}

// ldrex takes a "const volatile T*" and strex takes a "volatile T*". Our next
// task is to insert the appropriate casts into the AST. First work out just
// what the appropriate type is.
QualType ValType = pointerType->getPointeeType();
QualType AddrType = ValType.getUnqualifiedType().withVolatile();
if (IsLdrex)
  AddrType.addConst();

// Issue a warning if the cast is dodgy.
CastKind CastNeeded = CK_NoOp;
if (!AddrType.isAtLeastAsQualifiedAs(ValType)) {
  CastNeeded = CK_BitCast;
  Diag(DRE->getBeginLoc(), diag::ext_typecheck_convert_discards_qualifiers)
      << PointerArg->getType() << Context.getPointerType(AddrType)
      << AA_Passing << PointerArg->getSourceRange();
}

// Finally, do the cast and replace the argument with the corrected version.
AddrType = Context.getPointerType(AddrType);
PointerArgRes = ImpCastExprToType(PointerArg, AddrType, CastNeeded);
if (PointerArgRes.isInvalid())
  return true;
PointerArg = PointerArgRes.get();

TheCall->setArg(IsLdrex ? 0 : 1, PointerArg);

// In general, we allow ints, floats and pointers to be loaded and stored.
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
    !ValType->isBlockPointerType() && !ValType->isFloatingType()) {
  Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intfltptr)
      << PointerArg->getType() << PointerArg->getSourceRange();
  return true;
}

// But ARM doesn't have instructions to deal with 128-bit versions.
if (Context.getTypeSize(ValType) > MaxWidth) {
  assert(MaxWidth == 64 && "Diagnostic unexpectedly inaccurate")((void)0);
  Diag(DRE->getBeginLoc(), diag::err_atomic_exclusive_builtin_pointer_size)
      << PointerArg->getType() << PointerArg->getSourceRange();
  return true;
}

switch (ValType.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
  // okay
  break;

case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
  Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
      << ValType << PointerArg->getSourceRange();
  return true;
}

if (IsLdrex) {
  TheCall->setType(ValType);
  return false;
}

// Initialize the argument to be stored.
ExprResult ValArg = TheCall->getArg(0);
InitializedEntity Entity = InitializedEntity::InitializeParameter(
    Context, ValType, /*consume*/ false);
ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
if (ValArg.isInvalid())
  return true;
TheCall->setArg(0, ValArg.get());

// __builtin_arm_strex always returns an int. It's marked as such in the .def,
// but the custom checker bypasses all default analysis.
TheCall->setType(Context.IntTy);
return false;
2440}

2442bool Sema::CheckARMBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
                                     CallExpr *TheCall) {
if (BuiltinID == ARM::BI__builtin_arm_ldrex ||
    BuiltinID == ARM::BI__builtin_arm_ldaex ||
    BuiltinID == ARM::BI__builtin_arm_strex ||
    BuiltinID == ARM::BI__builtin_arm_stlex) {
  return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 64);
}

if (BuiltinID == ARM::BI__builtin_arm_prefetch) {
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
    SemaBuiltinConstantArgRange(TheCall, 2, 0, 1);
}

if (BuiltinID == ARM::BI__builtin_arm_rsr64 ||
    BuiltinID == ARM::BI__builtin_arm_wsr64)
  return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 3, false);

if (BuiltinID == ARM::BI__builtin_arm_rsr ||
    BuiltinID == ARM::BI__builtin_arm_rsrp ||
    BuiltinID == ARM::BI__builtin_arm_wsr ||
    BuiltinID == ARM::BI__builtin_arm_wsrp)
  return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);

if (CheckNeonBuiltinFunctionCall(TI, BuiltinID, TheCall))
  return true;
if (CheckMVEBuiltinFunctionCall(BuiltinID, TheCall))
  return true;
if (CheckCDEBuiltinFunctionCall(TI, BuiltinID, TheCall))
  return true;

// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
// FIXME: VFP Intrinsics should error if VFP not present.
switch (BuiltinID) {
default: return false;
case ARM::BI__builtin_arm_ssat:
  return SemaBuiltinConstantArgRange(TheCall, 1, 1, 32);
case ARM::BI__builtin_arm_usat:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 31);
case ARM::BI__builtin_arm_ssat16:
  return SemaBuiltinConstantArgRange(TheCall, 1, 1, 16);
case ARM::BI__builtin_arm_usat16:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
case ARM::BI__builtin_arm_vcvtr_f:
case ARM::BI__builtin_arm_vcvtr_d:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
case ARM::BI__builtin_arm_dmb:
case ARM::BI__builtin_arm_dsb:
case ARM::BI__builtin_arm_isb:
case ARM::BI__builtin_arm_dbg:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 15);
case ARM::BI__builtin_arm_cdp:
case ARM::BI__builtin_arm_cdp2:
case ARM::BI__builtin_arm_mcr:
case ARM::BI__builtin_arm_mcr2:
case ARM::BI__builtin_arm_mrc:
case ARM::BI__builtin_arm_mrc2:
case ARM::BI__builtin_arm_mcrr:
case ARM::BI__builtin_arm_mcrr2:
case ARM::BI__builtin_arm_mrrc:
case ARM::BI__builtin_arm_mrrc2:
case ARM::BI__builtin_arm_ldc:
case ARM::BI__builtin_arm_ldcl:
case ARM::BI__builtin_arm_ldc2:
case ARM::BI__builtin_arm_ldc2l:
case ARM::BI__builtin_arm_stc:
case ARM::BI__builtin_arm_stcl:
case ARM::BI__builtin_arm_stc2:
case ARM::BI__builtin_arm_stc2l:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 15) ||
         CheckARMCoprocessorImmediate(TI, TheCall->getArg(0),
                                      /*WantCDE*/ false);
}
2516}

2518bool Sema::CheckAArch64BuiltinFunctionCall(const TargetInfo &TI,
                                         unsigned BuiltinID,
                                         CallExpr *TheCall) {
if (BuiltinID == AArch64::BI__builtin_arm_ldrex ||
    BuiltinID == AArch64::BI__builtin_arm_ldaex ||
    BuiltinID == AArch64::BI__builtin_arm_strex ||
    BuiltinID == AArch64::BI__builtin_arm_stlex) {
  return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 128);
}

if (BuiltinID == AArch64::BI__builtin_arm_prefetch) {
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
    SemaBuiltinConstantArgRange(TheCall, 2, 0, 2) ||
    SemaBuiltinConstantArgRange(TheCall, 3, 0, 1) ||
    SemaBuiltinConstantArgRange(TheCall, 4, 0, 1);
}

if (BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
    BuiltinID == AArch64::BI__builtin_arm_wsr64)
  return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);

// Memory Tagging Extensions (MTE) Intrinsics
if (BuiltinID == AArch64::BI__builtin_arm_irg ||
    BuiltinID == AArch64::BI__builtin_arm_addg ||
    BuiltinID == AArch64::BI__builtin_arm_gmi ||
    BuiltinID == AArch64::BI__builtin_arm_ldg ||
    BuiltinID == AArch64::BI__builtin_arm_stg ||
    BuiltinID == AArch64::BI__builtin_arm_subp) {
  return SemaBuiltinARMMemoryTaggingCall(BuiltinID, TheCall);
}

if (BuiltinID == AArch64::BI__builtin_arm_rsr ||
    BuiltinID == AArch64::BI__builtin_arm_rsrp ||
    BuiltinID == AArch64::BI__builtin_arm_wsr ||
    BuiltinID == AArch64::BI__builtin_arm_wsrp)
  return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);

// Only check the valid encoding range. Any constant in this range would be
// converted to a register of the form S1_2_C3_C4_5. Let the hardware throw
// an exception for incorrect registers. This matches MSVC behavior.
if (BuiltinID == AArch64::BI_ReadStatusReg ||
    BuiltinID == AArch64::BI_WriteStatusReg)
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 0x7fff);

if (BuiltinID == AArch64::BI__getReg)
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);

if (CheckNeonBuiltinFunctionCall(TI, BuiltinID, TheCall))
  return true;

if (CheckSVEBuiltinFunctionCall(BuiltinID, TheCall))
  return true;

// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
unsigned i = 0, l = 0, u = 0;
switch (BuiltinID) {
default: return false;
case AArch64::BI__builtin_arm_dmb:
case AArch64::BI__builtin_arm_dsb:
case AArch64::BI__builtin_arm_isb: l = 0; u = 15; break;
case AArch64::BI__builtin_arm_tcancel: l = 0; u = 65535; break;
}

return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
2583}

2585static bool isValidBPFPreserveFieldInfoArg(Expr *Arg) {
if (Arg->getType()->getAsPlaceholderType())
  return false;

// The first argument needs to be a record field access.
// If it is an array element access, we delay decision
// to BPF backend to check whether the access is a
// field access or not.
return (Arg->IgnoreParens()->getObjectKind() == OK_BitField ||
        dyn_cast<MemberExpr>(Arg->IgnoreParens()) ||
        dyn_cast<ArraySubscriptExpr>(Arg->IgnoreParens()));
2596}

2598static bool isEltOfVectorTy(ASTContext &Context, CallExpr *Call, Sema &S,
                          QualType VectorTy, QualType EltTy) {
QualType VectorEltTy = VectorTy->castAs<VectorType>()->getElementType();
if (!Context.hasSameType(VectorEltTy, EltTy)) {
  S.Diag(Call->getBeginLoc(), diag::err_typecheck_call_different_arg_types)
      << Call->getSourceRange() << VectorEltTy << EltTy;
  return false;
}
return true;
2607}

2609static bool isValidBPFPreserveTypeInfoArg(Expr *Arg) {
QualType ArgType = Arg->getType();
if (ArgType->getAsPlaceholderType())
  return false;

// for TYPE_EXISTENCE/TYPE_SIZEOF reloc type
// format:
//   1. __builtin_preserve_type_info(*(<type> *)0, flag);
//   2. <type> var;
//      __builtin_preserve_type_info(var, flag);
if (!dyn_cast<DeclRefExpr>(Arg->IgnoreParens()) &&
    !dyn_cast<UnaryOperator>(Arg->IgnoreParens()))
  return false;

// Typedef type.
if (ArgType->getAs<TypedefType>())
  return true;

// Record type or Enum type.
const Type *Ty = ArgType->getUnqualifiedDesugaredType();
if (const auto *RT = Ty->getAs<RecordType>()) {
  if (!RT->getDecl()->getDeclName().isEmpty())
    return true;
} else if (const auto *ET = Ty->getAs<EnumType>()) {
  if (!ET->getDecl()->getDeclName().isEmpty())
    return true;
}

return false;
2638}

2640static bool isValidBPFPreserveEnumValueArg(Expr *Arg) {
QualType ArgType = Arg->getType();
if (ArgType->getAsPlaceholderType())
  return false;

// for ENUM_VALUE_EXISTENCE/ENUM_VALUE reloc type
// format:
//   __builtin_preserve_enum_value(*(<enum_type> *)<enum_value>,
//                                 flag);
const auto *UO = dyn_cast<UnaryOperator>(Arg->IgnoreParens());
if (!UO)
  return false;

const auto *CE = dyn_cast<CStyleCastExpr>(UO->getSubExpr());
if (!CE)
  return false;
if (CE->getCastKind() != CK_IntegralToPointer &&
    CE->getCastKind() != CK_NullToPointer)
  return false;

// The integer must be from an EnumConstantDecl.
const auto *DR = dyn_cast<DeclRefExpr>(CE->getSubExpr());
if (!DR)
  return false;

const EnumConstantDecl *Enumerator =
    dyn_cast<EnumConstantDecl>(DR->getDecl());
if (!Enumerator)
  return false;

// The type must be EnumType.
const Type *Ty = ArgType->getUnqualifiedDesugaredType();
const auto *ET = Ty->getAs<EnumType>();
if (!ET)
  return false;

// The enum value must be supported.
for (auto *EDI : ET->getDecl()->enumerators()) {
  if (EDI == Enumerator)
    return true;
}

return false;
2683}

2685bool Sema::CheckBPFBuiltinFunctionCall(unsigned BuiltinID,
                                     CallExpr *TheCall) {
assert((BuiltinID == BPF::BI__builtin_preserve_field_info ||((void)0)
        BuiltinID == BPF::BI__builtin_btf_type_id ||((void)0)
        BuiltinID == BPF::BI__builtin_preserve_type_info ||((void)0)
        BuiltinID == BPF::BI__builtin_preserve_enum_value) &&((void)0)
       "unexpected BPF builtin")((void)0);

if (checkArgCount(*this, TheCall, 2))
  return true;

// The second argument needs to be a constant int
Expr *Arg = TheCall->getArg(1);
Optional<llvm::APSInt> Value = Arg->getIntegerConstantExpr(Context);
diag::kind kind;
if (!Value) {
  if (BuiltinID == BPF::BI__builtin_preserve_field_info)
    kind = diag::err_preserve_field_info_not_const;
  else if (BuiltinID == BPF::BI__builtin_btf_type_id)
    kind = diag::err_btf_type_id_not_const;
  else if (BuiltinID == BPF::BI__builtin_preserve_type_info)
    kind = diag::err_preserve_type_info_not_const;
  else
    kind = diag::err_preserve_enum_value_not_const;
  Diag(Arg->getBeginLoc(), kind) << 2 << Arg->getSourceRange();
  return true;
}

// The first argument
Arg = TheCall->getArg(0);
bool InvalidArg = false;
bool ReturnUnsignedInt = true;
if (BuiltinID == BPF::BI__builtin_preserve_field_info) {
  if (!isValidBPFPreserveFieldInfoArg(Arg)) {
    InvalidArg = true;
    kind = diag::err_preserve_field_info_not_field;
  }
} else if (BuiltinID == BPF::BI__builtin_preserve_type_info) {
  if (!isValidBPFPreserveTypeInfoArg(Arg)) {
    InvalidArg = true;
    kind = diag::err_preserve_type_info_invalid;
  }
} else if (BuiltinID == BPF::BI__builtin_preserve_enum_value) {
  if (!isValidBPFPreserveEnumValueArg(Arg)) {
    InvalidArg = true;
    kind = diag::err_preserve_enum_value_invalid;
  }
  ReturnUnsignedInt = false;
} else if (BuiltinID == BPF::BI__builtin_btf_type_id) {
  ReturnUnsignedInt = false;
}

if (InvalidArg) {
  Diag(Arg->getBeginLoc(), kind) << 1 << Arg->getSourceRange();
  return true;
}

if (ReturnUnsignedInt)
  TheCall->setType(Context.UnsignedIntTy);
else
  TheCall->setType(Context.UnsignedLongTy);
return false;
2747}

2749bool Sema::CheckHexagonBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
struct ArgInfo {
  uint8_t OpNum;
  bool IsSigned;
  uint8_t BitWidth;
  uint8_t Align;
};
struct BuiltinInfo {
  unsigned BuiltinID;
  ArgInfo Infos[2];
};

static BuiltinInfo Infos[] = {
  { Hexagon::BI__builtin_circ_ldd,                  {{ 3, true,  4,  3 }} },
  { Hexagon::BI__builtin_circ_ldw,                  {{ 3, true,  4,  2 }} },
  { Hexagon::BI__builtin_circ_ldh,                  {{ 3, true,  4,  1 }} },
  { Hexagon::BI__builtin_circ_lduh,                 {{ 3, true,  4,  1 }} },
  { Hexagon::BI__builtin_circ_ldb,                  {{ 3, true,  4,  0 }} },
  { Hexagon::BI__builtin_circ_ldub,                 {{ 3, true,  4,  0 }} },
  { Hexagon::BI__builtin_circ_std,                  {{ 3, true,  4,  3 }} },
  { Hexagon::BI__builtin_circ_stw,                  {{ 3, true,  4,  2 }} },
  { Hexagon::BI__builtin_circ_sth,                  {{ 3, true,  4,  1 }} },
  { Hexagon::BI__builtin_circ_sthhi,                {{ 3, true,  4,  1 }} },
  { Hexagon::BI__builtin_circ_stb,                  {{ 3, true,  4,  0 }} },

  { Hexagon::BI__builtin_HEXAGON_L2_loadrub_pci,    {{ 1, true,  4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_L2_loadrb_pci,     {{ 1, true,  4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_L2_loadruh_pci,    {{ 1, true,  4,  1 }} },
  { Hexagon::BI__builtin_HEXAGON_L2_loadrh_pci,     {{ 1, true,  4,  1 }} },
  { Hexagon::BI__builtin_HEXAGON_L2_loadri_pci,     {{ 1, true,  4,  2 }} },
  { Hexagon::BI__builtin_HEXAGON_L2_loadrd_pci,     {{ 1, true,  4,  3 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_storerb_pci,    {{ 1, true,  4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_storerh_pci,    {{ 1, true,  4,  1 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_storerf_pci,    {{ 1, true,  4,  1 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_storeri_pci,    {{ 1, true,  4,  2 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_storerd_pci,    {{ 1, true,  4,  3 }} },

  { Hexagon::BI__builtin_HEXAGON_A2_combineii,      {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A2_tfrih,          {{ 1, false, 16, 0 }} },
  { Hexagon::BI__builtin_HEXAGON_A2_tfril,          {{ 1, false, 16, 0 }} },
  { Hexagon::BI__builtin_HEXAGON_A2_tfrpi,          {{ 0, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_bitspliti,      {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_cmpbeqi,        {{ 1, false, 8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_cmpbgti,        {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_cround_ri,      {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_round_ri,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_round_ri_sat,   {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpbeqi,       {{ 1, false, 8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpbgti,       {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpbgtui,      {{ 1, false, 7,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpheqi,       {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmphgti,       {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmphgtui,      {{ 1, false, 7,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpweqi,       {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpwgti,       {{ 1, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_A4_vcmpwgtui,      {{ 1, false, 7,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_C2_bitsclri,       {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_C2_muxii,          {{ 2, true,  8,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_C4_nbitsclri,      {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_F2_dfclass,        {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_F2_dfimm_n,        {{ 0, false, 10, 0 }} },
  { Hexagon::BI__builtin_HEXAGON_F2_dfimm_p,        {{ 0, false, 10, 0 }} },
  { Hexagon::BI__builtin_HEXAGON_F2_sfclass,        {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_F2_sfimm_n,        {{ 0, false, 10, 0 }} },
  { Hexagon::BI__builtin_HEXAGON_F2_sfimm_p,        {{ 0, false, 10, 0 }} },
  { Hexagon::BI__builtin_HEXAGON_M4_mpyri_addi,     {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_M4_mpyri_addr_u2,  {{ 1, false, 6,  2 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_addasl_rrri,    {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_acc,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_and,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p,        {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_nac,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_or,     {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_xacc,   {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_acc,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_and,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r,        {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_nac,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_or,     {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_sat,    {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_xacc,   {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_vh,       {{ 1, false, 4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asl_i_vw,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_acc,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_and,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p,        {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_nac,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_or,     {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd_goodsyntax,
                                                    {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd,    {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_acc,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_and,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r,        {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_nac,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_or,     {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd_goodsyntax,
                                                    {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd,    {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_svw_trun, {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_vh,       {{ 1, false, 4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_asr_i_vw,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_clrbit_i,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_extractu,       {{ 1, false, 5,  0 },
                                                     { 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_extractup,      {{ 1, false, 6,  0 },
                                                     { 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_insert,         {{ 2, false, 5,  0 },
                                                     { 3, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_insertp,        {{ 2, false, 6,  0 },
                                                     { 3, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_acc,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_and,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p,        {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_nac,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_or,     {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_xacc,   {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_acc,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_and,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r,        {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_nac,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_or,     {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_xacc,   {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vh,       {{ 1, false, 4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vw,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_setbit_i,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_tableidxb_goodsyntax,
                                                    {{ 2, false, 4,  0 },
                                                     { 3, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_tableidxd_goodsyntax,
                                                    {{ 2, false, 4,  0 },
                                                     { 3, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_tableidxh_goodsyntax,
                                                    {{ 2, false, 4,  0 },
                                                     { 3, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_tableidxw_goodsyntax,
                                                    {{ 2, false, 4,  0 },
                                                     { 3, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_togglebit_i,    {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_tstbit_i,       {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_valignib,       {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S2_vspliceib,      {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_addi_asl_ri,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_addi_lsr_ri,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_andi_asl_ri,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_andi_lsr_ri,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_clbaddi,        {{ 1, true , 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_clbpaddi,       {{ 1, true,  6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_extract,        {{ 1, false, 5,  0 },
                                                     { 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_extractp,       {{ 1, false, 6,  0 },
                                                     { 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_lsli,           {{ 0, true,  6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_ntstbit_i,      {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_ori_asl_ri,     {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_ori_lsr_ri,     {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_subi_asl_ri,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_subi_lsr_ri,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_vrcrotate_acc,  {{ 3, false, 2,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S4_vrcrotate,      {{ 2, false, 2,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S5_asrhub_rnd_sat_goodsyntax,
                                                    {{ 1, false, 4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S5_asrhub_sat,     {{ 1, false, 4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S5_vasrhrnd_goodsyntax,
                                                    {{ 1, false, 4,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p,        {{ 1, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_acc,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_and,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_nac,    {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_or,     {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_xacc,   {{ 2, false, 6,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r,        {{ 1, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_acc,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_and,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_nac,    {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_or,     {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_xacc,   {{ 2, false, 5,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_valignbi,       {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_valignbi_128B,  {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi,      {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi_128B, {{ 2, false, 3,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi,      {{ 2, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_128B, {{ 2, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc,  {{ 3, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc_128B,
                                                    {{ 3, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi,       {{ 2, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_128B,  {{ 2, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc,   {{ 3, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc_128B,
                                                    {{ 3, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi,       {{ 2, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_128B,  {{ 2, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc,   {{ 3, false, 1,  0 }} },
  { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc_128B,
                                                    {{ 3, false, 1,  0 }} },
};

// Use a dynamically initialized static to sort the table exactly once on
// first run.
static const bool SortOnce =
    (llvm::sort(Infos,
               [](const BuiltinInfo &LHS, const BuiltinInfo &RHS) {
                 return LHS.BuiltinID < RHS.BuiltinID;
               }),
     true);
(void)SortOnce;

const BuiltinInfo *F = llvm::partition_point(
    Infos, [=](const BuiltinInfo &BI) { return BI.BuiltinID < BuiltinID; });
if (F == std::end(Infos) || F->BuiltinID != BuiltinID)
  return false;

bool Error = false;

for (const ArgInfo &A : F->Infos) {
  // Ignore empty ArgInfo elements.
  if (A.BitWidth == 0)
    continue;

  int32_t Min = A.IsSigned ? -(1 << (A.BitWidth - 1)) : 0;
  int32_t Max = (1 << (A.IsSigned ? A.BitWidth - 1 : A.BitWidth)) - 1;
  if (!A.Align) {
    Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max);
  } else {
    unsigned M = 1 << A.Align;
    Min *= M;
    Max *= M;
    Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max) |
             SemaBuiltinConstantArgMultiple(TheCall, A.OpNum, M);
  }
}
return Error;
2982}

2984bool Sema::CheckHexagonBuiltinFunctionCall(unsigned BuiltinID,
                                         CallExpr *TheCall) {
return CheckHexagonBuiltinArgument(BuiltinID, TheCall);
2987}

2989bool Sema::CheckMipsBuiltinFunctionCall(const TargetInfo &TI,
                                      unsigned BuiltinID, CallExpr *TheCall) {
return CheckMipsBuiltinCpu(TI, BuiltinID, TheCall) ||
       CheckMipsBuiltinArgument(BuiltinID, TheCall);
2993}

2995bool Sema::CheckMipsBuiltinCpu(const TargetInfo &TI, unsigned BuiltinID,
                             CallExpr *TheCall) {

if (Mips::BI__builtin_mips_addu_qb <= BuiltinID &&
    BuiltinID <= Mips::BI__builtin_mips_lwx) {
  if (!TI.hasFeature("dsp"))
    return Diag(TheCall->getBeginLoc(), diag::err_mips_builtin_requires_dsp);
}

if (Mips::BI__builtin_mips_absq_s_qb <= BuiltinID &&
    BuiltinID <= Mips::BI__builtin_mips_subuh_r_qb) {
  if (!TI.hasFeature("dspr2"))
    return Diag(TheCall->getBeginLoc(),
                diag::err_mips_builtin_requires_dspr2);
}

if (Mips::BI__builtin_msa_add_a_b <= BuiltinID &&
    BuiltinID <= Mips::BI__builtin_msa_xori_b) {
  if (!TI.hasFeature("msa"))
    return Diag(TheCall->getBeginLoc(), diag::err_mips_builtin_requires_msa);
}

return false;
3018}

3020// CheckMipsBuiltinArgument - Checks the constant value passed to the
3021// intrinsic is correct. The switch statement is ordered by DSP, MSA. The
3022// ordering for DSP is unspecified. MSA is ordered by the data format used
3023// by the underlying instruction i.e., df/m, df/n and then by size.
3024//
3025// FIXME: The size tests here should instead be tablegen'd along with the
3026//        definitions from include/clang/Basic/BuiltinsMips.def.
3027// FIXME: GCC is strict on signedness for some of these intrinsics, we should
3028//        be too.
3029bool Sema::CheckMipsBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
unsigned i = 0, l = 0, u = 0, m = 0;
switch (BuiltinID) {
default: return false;
case Mips::BI__builtin_mips_wrdsp: i = 1; l = 0; u = 63; break;
case Mips::BI__builtin_mips_rddsp: i = 0; l = 0; u = 63; break;
case Mips::BI__builtin_mips_append: i = 2; l = 0; u = 31; break;
case Mips::BI__builtin_mips_balign: i = 2; l = 0; u = 3; break;
case Mips::BI__builtin_mips_precr_sra_ph_w: i = 2; l = 0; u = 31; break;
case Mips::BI__builtin_mips_precr_sra_r_ph_w: i = 2; l = 0; u = 31; break;
case Mips::BI__builtin_mips_prepend: i = 2; l = 0; u = 31; break;
// MSA intrinsics. Instructions (which the intrinsics maps to) which use the
// df/m field.
// These intrinsics take an unsigned 3 bit immediate.
case Mips::BI__builtin_msa_bclri_b:
case Mips::BI__builtin_msa_bnegi_b:
case Mips::BI__builtin_msa_bseti_b:
case Mips::BI__builtin_msa_sat_s_b:
case Mips::BI__builtin_msa_sat_u_b:
case Mips::BI__builtin_msa_slli_b:
case Mips::BI__builtin_msa_srai_b:
case Mips::BI__builtin_msa_srari_b:
case Mips::BI__builtin_msa_srli_b:
case Mips::BI__builtin_msa_srlri_b: i = 1; l = 0; u = 7; break;
case Mips::BI__builtin_msa_binsli_b:
case Mips::BI__builtin_msa_binsri_b: i = 2; l = 0; u = 7; break;
// These intrinsics take an unsigned 4 bit immediate.
case Mips::BI__builtin_msa_bclri_h:
case Mips::BI__builtin_msa_bnegi_h:
case Mips::BI__builtin_msa_bseti_h:
case Mips::BI__builtin_msa_sat_s_h:
case Mips::BI__builtin_msa_sat_u_h:
case Mips::BI__builtin_msa_slli_h:
case Mips::BI__builtin_msa_srai_h:
case Mips::BI__builtin_msa_srari_h:
case Mips::BI__builtin_msa_srli_h:
case Mips::BI__builtin_msa_srlri_h: i = 1; l = 0; u = 15; break;
case Mips::BI__builtin_msa_binsli_h:
case Mips::BI__builtin_msa_binsri_h: i = 2; l = 0; u = 15; break;
// These intrinsics take an unsigned 5 bit immediate.
// The first block of intrinsics actually have an unsigned 5 bit field,
// not a df/n field.
case Mips::BI__builtin_msa_cfcmsa:
case Mips::BI__builtin_msa_ctcmsa: i = 0; l = 0; u = 31; break;
case Mips::BI__builtin_msa_clei_u_b:
case Mips::BI__builtin_msa_clei_u_h:
case Mips::BI__builtin_msa_clei_u_w:
case Mips::BI__builtin_msa_clei_u_d:
case Mips::BI__builtin_msa_clti_u_b:
case Mips::BI__builtin_msa_clti_u_h:
case Mips::BI__builtin_msa_clti_u_w:
case Mips::BI__builtin_msa_clti_u_d:
case Mips::BI__builtin_msa_maxi_u_b:
case Mips::BI__builtin_msa_maxi_u_h:
case Mips::BI__builtin_msa_maxi_u_w:
case Mips::BI__builtin_msa_maxi_u_d:
case Mips::BI__builtin_msa_mini_u_b:
case Mips::BI__builtin_msa_mini_u_h:
case Mips::BI__builtin_msa_mini_u_w:
case Mips::BI__builtin_msa_mini_u_d:
case Mips::BI__builtin_msa_addvi_b:
case Mips::BI__builtin_msa_addvi_h:
case Mips::BI__builtin_msa_addvi_w:
case Mips::BI__builtin_msa_addvi_d:
case Mips::BI__builtin_msa_bclri_w:
case Mips::BI__builtin_msa_bnegi_w:
case Mips::BI__builtin_msa_bseti_w:
case Mips::BI__builtin_msa_sat_s_w:
case Mips::BI__builtin_msa_sat_u_w:
case Mips::BI__builtin_msa_slli_w:
case Mips::BI__builtin_msa_srai_w:
case Mips::BI__builtin_msa_srari_w:
case Mips::BI__builtin_msa_srli_w:
case Mips::BI__builtin_msa_srlri_w:
case Mips::BI__builtin_msa_subvi_b:
case Mips::BI__builtin_msa_subvi_h:
case Mips::BI__builtin_msa_subvi_w:
case Mips::BI__builtin_msa_subvi_d: i = 1; l = 0; u = 31; break;
case Mips::BI__builtin_msa_binsli_w:
case Mips::BI__builtin_msa_binsri_w: i = 2; l = 0; u = 31; break;
// These intrinsics take an unsigned 6 bit immediate.
case Mips::BI__builtin_msa_bclri_d:
case Mips::BI__builtin_msa_bnegi_d:
case Mips::BI__builtin_msa_bseti_d:
case Mips::BI__builtin_msa_sat_s_d:
case Mips::BI__builtin_msa_sat_u_d:
case Mips::BI__builtin_msa_slli_d:
case Mips::BI__builtin_msa_srai_d:
case Mips::BI__builtin_msa_srari_d:
case Mips::BI__builtin_msa_srli_d:
case Mips::BI__builtin_msa_srlri_d: i = 1; l = 0; u = 63; break;
case Mips::BI__builtin_msa_binsli_d:
case Mips::BI__builtin_msa_binsri_d: i = 2; l = 0; u = 63; break;
// These intrinsics take a signed 5 bit immediate.
case Mips::BI__builtin_msa_ceqi_b:
case Mips::BI__builtin_msa_ceqi_h:
case Mips::BI__builtin_msa_ceqi_w:
case Mips::BI__builtin_msa_ceqi_d:
case Mips::BI__builtin_msa_clti_s_b:
case Mips::BI__builtin_msa_clti_s_h:
case Mips::BI__builtin_msa_clti_s_w:
case Mips::BI__builtin_msa_clti_s_d:
case Mips::BI__builtin_msa_clei_s_b:
case Mips::BI__builtin_msa_clei_s_h:
case Mips::BI__builtin_msa_clei_s_w:
case Mips::BI__builtin_msa_clei_s_d:
case Mips::BI__builtin_msa_maxi_s_b:
case Mips::BI__builtin_msa_maxi_s_h:
case Mips::BI__builtin_msa_maxi_s_w:
case Mips::BI__builtin_msa_maxi_s_d:
case Mips::BI__builtin_msa_mini_s_b:
case Mips::BI__builtin_msa_mini_s_h:
case Mips::BI__builtin_msa_mini_s_w:
case Mips::BI__builtin_msa_mini_s_d: i = 1; l = -16; u = 15; break;
// These intrinsics take an unsigned 8 bit immediate.
case Mips::BI__builtin_msa_andi_b:
case Mips::BI__builtin_msa_nori_b:
case Mips::BI__builtin_msa_ori_b:
case Mips::BI__builtin_msa_shf_b:
case Mips::BI__builtin_msa_shf_h:
case Mips::BI__builtin_msa_shf_w:
case Mips::BI__builtin_msa_xori_b: i = 1; l = 0; u = 255; break;
case Mips::BI__builtin_msa_bseli_b:
case Mips::BI__builtin_msa_bmnzi_b:
case Mips::BI__builtin_msa_bmzi_b: i = 2; l = 0; u = 255; break;
// df/n format
// These intrinsics take an unsigned 4 bit immediate.
case Mips::BI__builtin_msa_copy_s_b:
case Mips::BI__builtin_msa_copy_u_b:
case Mips::BI__builtin_msa_insve_b:
case Mips::BI__builtin_msa_splati_b: i = 1; l = 0; u = 15; break;
case Mips::BI__builtin_msa_sldi_b: i = 2; l = 0; u = 15; break;
// These intrinsics take an unsigned 3 bit immediate.
case Mips::BI__builtin_msa_copy_s_h:
case Mips::BI__builtin_msa_copy_u_h:
case Mips::BI__builtin_msa_insve_h:
case Mips::BI__builtin_msa_splati_h: i = 1; l = 0; u = 7; break;
case Mips::BI__builtin_msa_sldi_h: i = 2; l = 0; u = 7; break;
// These intrinsics take an unsigned 2 bit immediate.
case Mips::BI__builtin_msa_copy_s_w:
case Mips::BI__builtin_msa_copy_u_w:
case Mips::BI__builtin_msa_insve_w:
case Mips::BI__builtin_msa_splati_w: i = 1; l = 0; u = 3; break;
case Mips::BI__builtin_msa_sldi_w: i = 2; l = 0; u = 3; break;
// These intrinsics take an unsigned 1 bit immediate.
case Mips::BI__builtin_msa_copy_s_d:
case Mips::BI__builtin_msa_copy_u_d:
case Mips::BI__builtin_msa_insve_d:
case Mips::BI__builtin_msa_splati_d: i = 1; l = 0; u = 1; break;
case Mips::BI__builtin_msa_sldi_d: i = 2; l = 0; u = 1; break;
// Memory offsets and immediate loads.
// These intrinsics take a signed 10 bit immediate.
case Mips::BI__builtin_msa_ldi_b: i = 0; l = -128; u = 255; break;
case Mips::BI__builtin_msa_ldi_h:
case Mips::BI__builtin_msa_ldi_w:
case Mips::BI__builtin_msa_ldi_d: i = 0; l = -512; u = 511; break;
case Mips::BI__builtin_msa_ld_b: i = 1; l = -512; u = 511; m = 1; break;
case Mips::BI__builtin_msa_ld_h: i = 1; l = -1024; u = 1022; m = 2; break;
case Mips::BI__builtin_msa_ld_w: i = 1; l = -2048; u = 2044; m = 4; break;
case Mips::BI__builtin_msa_ld_d: i = 1; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_ldr_d: i = 1; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_ldr_w: i = 1; l = -2048; u = 2044; m = 4; break;
case Mips::BI__builtin_msa_st_b: i = 2; l = -512; u = 511; m = 1; break;
case Mips::BI__builtin_msa_st_h: i = 2; l = -1024; u = 1022; m = 2; break;
case Mips::BI__builtin_msa_st_w: i = 2; l = -2048; u = 2044; m = 4; break;
case Mips::BI__builtin_msa_st_d: i = 2; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_str_d: i = 2; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_str_w: i = 2; l = -2048; u = 2044; m = 4; break;
}

if (!m)
  return SemaBuiltinConstantArgRange(TheCall, i, l, u);

return SemaBuiltinConstantArgRange(TheCall, i, l, u) ||
       SemaBuiltinConstantArgMultiple(TheCall, i, m);
3204}

3206/// DecodePPCMMATypeFromStr - This decodes one PPC MMA type descriptor from Str,
3207/// advancing the pointer over the consumed characters. The decoded type is
3208/// returned. If the decoded type represents a constant integer with a
3209/// constraint on its value then Mask is set to that value. The type descriptors
3210/// used in Str are specific to PPC MMA builtins and are documented in the file
3211/// defining the PPC builtins.
3212static QualType DecodePPCMMATypeFromStr(ASTContext &Context, const char *&Str,
                                      unsigned &Mask) {
bool RequireICE = false;
ASTContext::GetBuiltinTypeError Error = ASTContext::GE_None;
switch (*Str++) {
case 'V':
  return Context.getVectorType(Context.UnsignedCharTy, 16,
                               VectorType::VectorKind::AltiVecVector);
case 'i': {
  char *End;
  unsigned size = strtoul(Str, &End, 10);
  assert(End != Str && "Missing constant parameter constraint")((void)0);
  Str = End;
  Mask = size;
  return Context.IntTy;
}
case 'W': {
  char *End;
  unsigned size = strtoul(Str, &End, 10);
  assert(End != Str && "Missing PowerPC MMA type size")((void)0);
  Str = End;
  QualType Type;
  switch (size) {
#define PPC_VECTOR_TYPE(typeName, Id, size) \
  case size: Type = Context.Id##Ty; break;
#include "clang/Basic/PPCTypes.def"
  default: llvm_unreachable("Invalid PowerPC MMA vector type")__builtin_unreachable();
  }
  bool CheckVectorArgs = false;
  while (!CheckVectorArgs) {
    switch (*Str++) {
    case '*':
      Type = Context.getPointerType(Type);
      break;
    case 'C':
      Type = Type.withConst();
      break;
    default:
      CheckVectorArgs = true;
      --Str;
      break;
    }
  }
  return Type;
}
default:
  return Context.DecodeTypeStr(--Str, Context, Error, RequireICE, true);
}
3260}

3262static bool isPPC_64Builtin(unsigned BuiltinID) {
// These builtins only work on PPC 64bit targets.
switch (BuiltinID) {
case PPC::BI__builtin_divde:
case PPC::BI__builtin_divdeu:
case PPC::BI__builtin_bpermd:
case PPC::BI__builtin_ppc_ldarx:
case PPC::BI__builtin_ppc_stdcx:
case PPC::BI__builtin_ppc_tdw:
case PPC::BI__builtin_ppc_trapd:
case PPC::BI__builtin_ppc_cmpeqb:
case PPC::BI__builtin_ppc_setb:
case PPC::BI__builtin_ppc_mulhd:
case PPC::BI__builtin_ppc_mulhdu:
case PPC::BI__builtin_ppc_maddhd:
case PPC::BI__builtin_ppc_maddhdu:
case PPC::BI__builtin_ppc_maddld:
case PPC::BI__builtin_ppc_load8r:
case PPC::BI__builtin_ppc_store8r:
case PPC::BI__builtin_ppc_insert_exp:
case PPC::BI__builtin_ppc_extract_sig:
  return true;
}
return false;
3286}

3288static bool SemaFeatureCheck(Sema &S, CallExpr *TheCall,
                           StringRef FeatureToCheck, unsigned DiagID,
                           StringRef DiagArg = "") {
if (S.Context.getTargetInfo().hasFeature(FeatureToCheck))
  return false;

if (DiagArg.empty())
  S.Diag(TheCall->getBeginLoc(), DiagID) << TheCall->getSourceRange();
else
  S.Diag(TheCall->getBeginLoc(), DiagID)
      << DiagArg << TheCall->getSourceRange();

return true;
3301}

3303/// Returns true if the argument consists of one contiguous run of 1s with any
3304/// number of 0s on either side. The 1s are allowed to wrap from LSB to MSB, so
3305/// 0x000FFF0, 0x0000FFFF, 0xFF0000FF, 0x0 are all runs. 0x0F0F0000 is not,
3306/// since all 1s are not contiguous.
3307bool Sema::SemaValueIsRunOfOnes(CallExpr *TheCall, unsigned ArgNum) {
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

// Check contiguous run of 1s, 0xFF0000FF is also a run of 1s.
if (Result.isShiftedMask() || (~Result).isShiftedMask())
  return false;

return Diag(TheCall->getBeginLoc(),
            diag::err_argument_not_contiguous_bit_field)
       << ArgNum << Arg->getSourceRange();
3325}

3327bool Sema::CheckPPCBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
                                     CallExpr *TheCall) {
unsigned i = 0, l = 0, u = 0;
bool IsTarget64Bit = TI.getTypeWidth(TI.getIntPtrType()) == 64;
llvm::APSInt Result;

if (isPPC_64Builtin(BuiltinID) && !IsTarget64Bit)
  return Diag(TheCall->getBeginLoc(), diag::err_64_bit_builtin_32_bit_tgt)
         << TheCall->getSourceRange();

switch (BuiltinID) {
default: return false;
case PPC::BI__builtin_altivec_crypto_vshasigmaw:
case PPC::BI__builtin_altivec_crypto_vshasigmad:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
         SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
case PPC::BI__builtin_altivec_dss:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 3);
case PPC::BI__builtin_tbegin:
case PPC::BI__builtin_tend: i = 0; l = 0; u = 1; break;
case PPC::BI__builtin_tsr: i = 0; l = 0; u = 7; break;
case PPC::BI__builtin_tabortwc:
case PPC::BI__builtin_tabortdc: i = 0; l = 0; u = 31; break;
case PPC::BI__builtin_tabortwci:
case PPC::BI__builtin_tabortdci:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31) ||
         SemaBuiltinConstantArgRange(TheCall, 2, 0, 31);
case PPC::BI__builtin_altivec_dst:
case PPC::BI__builtin_altivec_dstt:
case PPC::BI__builtin_altivec_dstst:
case PPC::BI__builtin_altivec_dststt:
  return SemaBuiltinConstantArgRange(TheCall, 2, 0, 3);
case PPC::BI__builtin_vsx_xxpermdi:
case PPC::BI__builtin_vsx_xxsldwi:
  return SemaBuiltinVSX(TheCall);
case PPC::BI__builtin_divwe:
case PPC::BI__builtin_divweu:
case PPC::BI__builtin_divde:
case PPC::BI__builtin_divdeu:
  return SemaFeatureCheck(*this, TheCall, "extdiv",
                          diag::err_ppc_builtin_only_on_arch, "7");
case PPC::BI__builtin_bpermd:
  return SemaFeatureCheck(*this, TheCall, "bpermd",
                          diag::err_ppc_builtin_only_on_arch, "7");
case PPC::BI__builtin_unpack_vector_int128:
  return SemaFeatureCheck(*this, TheCall, "vsx",
                          diag::err_ppc_builtin_only_on_arch, "7") ||
         SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
case PPC::BI__builtin_pack_vector_int128:
  return SemaFeatureCheck(*this, TheCall, "vsx",
                          diag::err_ppc_builtin_only_on_arch, "7");
case PPC::BI__builtin_altivec_vgnb:
   return SemaBuiltinConstantArgRange(TheCall, 1, 2, 7);
case PPC::BI__builtin_altivec_vec_replace_elt:
case PPC::BI__builtin_altivec_vec_replace_unaligned: {
  QualType VecTy = TheCall->getArg(0)->getType();
  QualType EltTy = TheCall->getArg(1)->getType();
  unsigned Width = Context.getIntWidth(EltTy);
  return SemaBuiltinConstantArgRange(TheCall, 2, 0, Width == 32 ? 12 : 8) ||
         !isEltOfVectorTy(Context, TheCall, *this, VecTy, EltTy);
}
case PPC::BI__builtin_vsx_xxeval:
   return SemaBuiltinConstantArgRange(TheCall, 3, 0, 255);
case PPC::BI__builtin_altivec_vsldbi:
   return SemaBuiltinConstantArgRange(TheCall, 2, 0, 7);
case PPC::BI__builtin_altivec_vsrdbi:
   return SemaBuiltinConstantArgRange(TheCall, 2, 0, 7);
case PPC::BI__builtin_vsx_xxpermx:
   return SemaBuiltinConstantArgRange(TheCall, 3, 0, 7);
case PPC::BI__builtin_ppc_tw:
case PPC::BI__builtin_ppc_tdw:
  return SemaBuiltinConstantArgRange(TheCall, 2, 1, 31);
case PPC::BI__builtin_ppc_cmpeqb:
case PPC::BI__builtin_ppc_setb:
case PPC::BI__builtin_ppc_maddhd:
case PPC::BI__builtin_ppc_maddhdu:
case PPC::BI__builtin_ppc_maddld:
  return SemaFeatureCheck(*this, TheCall, "isa-v30-instructions",
                          diag::err_ppc_builtin_only_on_arch, "9");
case PPC::BI__builtin_ppc_cmprb:
  return SemaFeatureCheck(*this, TheCall, "isa-v30-instructions",
                          diag::err_ppc_builtin_only_on_arch, "9") ||
         SemaBuiltinConstantArgRange(TheCall, 0, 0, 1);
// For __rlwnm, __rlwimi and __rldimi, the last parameter mask must
// be a constant that represents a contiguous bit field.
case PPC::BI__builtin_ppc_rlwnm:
  return SemaBuiltinConstantArg(TheCall, 1, Result) ||
         SemaValueIsRunOfOnes(TheCall, 2);
case PPC::BI__builtin_ppc_rlwimi:
case PPC::BI__builtin_ppc_rldimi:
  return SemaBuiltinConstantArg(TheCall, 2, Result) ||
         SemaValueIsRunOfOnes(TheCall, 3);
case PPC::BI__builtin_ppc_extract_exp:
case PPC::BI__builtin_ppc_extract_sig:
case PPC::BI__builtin_ppc_insert_exp:
  return SemaFeatureCheck(*this, TheCall, "power9-vector",
                          diag::err_ppc_builtin_only_on_arch, "9");
case PPC::BI__builtin_ppc_mtfsb0:
case PPC::BI__builtin_ppc_mtfsb1:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);
case PPC::BI__builtin_ppc_mtfsf:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 255);
case PPC::BI__builtin_ppc_mtfsfi:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 7) ||
         SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
case PPC::BI__builtin_ppc_alignx:
  return SemaBuiltinConstantArgPower2(TheCall, 0);
case PPC::BI__builtin_ppc_rdlam:
  return SemaValueIsRunOfOnes(TheCall, 2);
case PPC::BI__builtin_ppc_icbt:
case PPC::BI__builtin_ppc_sthcx:
case PPC::BI__builtin_ppc_stbcx:
case PPC::BI__builtin_ppc_lharx:
case PPC::BI__builtin_ppc_lbarx:
  return SemaFeatureCheck(*this, TheCall, "isa-v207-instructions",
                          diag::err_ppc_builtin_only_on_arch, "8");
case PPC::BI__builtin_vsx_ldrmb:
case PPC::BI__builtin_vsx_strmb:
  return SemaFeatureCheck(*this, TheCall, "isa-v207-instructions",
                          diag::err_ppc_builtin_only_on_arch, "8") ||
         SemaBuiltinConstantArgRange(TheCall, 1, 1, 16);
3448#define CUSTOM_BUILTIN(Name, Intr, Types, Acc) \
case PPC::BI__builtin_##Name: \
  return SemaBuiltinPPCMMACall(TheCall, Types);
3451#include "clang/Basic/BuiltinsPPC.def"
}
return SemaBuiltinConstantArgRange(TheCall, i, l, u);
3454}

3456// Check if the given type is a non-pointer PPC MMA type. This function is used
3457// in Sema to prevent invalid uses of restricted PPC MMA types.
3458bool Sema::CheckPPCMMAType(QualType Type, SourceLocation TypeLoc) {
if (Type->isPointerType() || Type->isArrayType())
  return false;

QualType CoreType = Type.getCanonicalType().getUnqualifiedType();
3463#define PPC_VECTOR_TYPE(Name, Id, Size) || CoreType == Context.Id##Ty
if (false
3465#include "clang/Basic/PPCTypes.def"
   ) {
  Diag(TypeLoc, diag::err_ppc_invalid_use_mma_type);
  return true;
}
return false;
3471}

3473bool Sema::CheckAMDGCNBuiltinFunctionCall(unsigned BuiltinID,
                                        CallExpr *TheCall) {
// position of memory order and scope arguments in the builtin
unsigned OrderIndex, ScopeIndex;
switch (BuiltinID) {
case AMDGPU::BI__builtin_amdgcn_atomic_inc32:
case AMDGPU::BI__builtin_amdgcn_atomic_inc64:
case AMDGPU::BI__builtin_amdgcn_atomic_dec32:
case AMDGPU::BI__builtin_amdgcn_atomic_dec64:
  OrderIndex = 2;
  ScopeIndex = 3;
  break;
case AMDGPU::BI__builtin_amdgcn_fence:
  OrderIndex = 0;
  ScopeIndex = 1;
  break;
default:
  return false;
}

ExprResult Arg = TheCall->getArg(OrderIndex);
auto ArgExpr = Arg.get();
Expr::EvalResult ArgResult;

if (!ArgExpr->EvaluateAsInt(ArgResult, Context))
  return Diag(ArgExpr->getExprLoc(), diag::err_typecheck_expect_int)
         << ArgExpr->getType();
auto Ord = ArgResult.Val.getInt().getZExtValue();

// Check valididty of memory ordering as per C11 / C++11's memody model.
// Only fence needs check. Atomic dec/inc allow all memory orders.
if (!llvm::isValidAtomicOrderingCABI(Ord))
  return Diag(ArgExpr->getBeginLoc(),
              diag::warn_atomic_op_has_invalid_memory_order)
         << ArgExpr->getSourceRange();
switch (static_cast<llvm::AtomicOrderingCABI>(Ord)) {
case llvm::AtomicOrderingCABI::relaxed:
case llvm::AtomicOrderingCABI::consume:
  if (BuiltinID == AMDGPU::BI__builtin_amdgcn_fence)
    return Diag(ArgExpr->getBeginLoc(),
                diag::warn_atomic_op_has_invalid_memory_order)
           << ArgExpr->getSourceRange();
  break;
case llvm::AtomicOrderingCABI::acquire:
case llvm::AtomicOrderingCABI::release:
case llvm::AtomicOrderingCABI::acq_rel:
case llvm::AtomicOrderingCABI::seq_cst:
  break;
}

Arg = TheCall->getArg(ScopeIndex);
ArgExpr = Arg.get();
Expr::EvalResult ArgResult1;
// Check that sync scope is a constant literal
if (!ArgExpr->EvaluateAsConstantExpr(ArgResult1, Context))
  return Diag(ArgExpr->getExprLoc(), diag::err_expr_not_string_literal)
         << ArgExpr->getType();

return false;
3532}

3534bool Sema::CheckRISCVLMUL(CallExpr *TheCall, unsigned ArgNum) {
llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

int64_t Val = Result.getSExtValue();
if ((Val >= 0 && Val <= 3) || (Val >= 5 && Val <= 7))
  return false;

return Diag(TheCall->getBeginLoc(), diag::err_riscv_builtin_invalid_lmul)
       << Arg->getSourceRange();
3552}

3554bool Sema::CheckRISCVBuiltinFunctionCall(const TargetInfo &TI,
                                       unsigned BuiltinID,
                                       CallExpr *TheCall) {
// CodeGenFunction can also detect this, but this gives a better error
// message.
bool FeatureMissing = false;
SmallVector<StringRef> ReqFeatures;
StringRef Features = Context.BuiltinInfo.getRequiredFeatures(BuiltinID);
Features.split(ReqFeatures, ',');

// Check if each required feature is included
for (StringRef F : ReqFeatures) {
  if (TI.hasFeature(F))
    continue;

  // If the feature is 64bit, alter the string so it will print better in
  // the diagnostic.
  if (F == "64bit")
    F = "RV64";

  // Convert features like "zbr" and "experimental-zbr" to "Zbr".
  F.consume_front("experimental-");
  std::string FeatureStr = F.str();
  FeatureStr[0] = std::toupper(FeatureStr[0]);

  // Error message
  FeatureMissing = true;
  Diag(TheCall->getBeginLoc(), diag::err_riscv_builtin_requires_extension)
      << TheCall->getSourceRange() << StringRef(FeatureStr);
}

if (FeatureMissing)
  return true;

switch (BuiltinID) {
case RISCV::BI__builtin_rvv_vsetvli:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 3) ||
         CheckRISCVLMUL(TheCall, 2);
case RISCV::BI__builtin_rvv_vsetvlimax:
  return SemaBuiltinConstantArgRange(TheCall, 0, 0, 3) ||
         CheckRISCVLMUL(TheCall, 1);
case RISCV::BI__builtin_rvv_vget_v_i8m2_i8m1:
case RISCV::BI__builtin_rvv_vget_v_i16m2_i16m1:
case RISCV::BI__builtin_rvv_vget_v_i32m2_i32m1:
case RISCV::BI__builtin_rvv_vget_v_i64m2_i64m1:
case RISCV::BI__builtin_rvv_vget_v_f32m2_f32m1:
case RISCV::BI__builtin_rvv_vget_v_f64m2_f64m1:
case RISCV::BI__builtin_rvv_vget_v_u8m2_u8m1:
case RISCV::BI__builtin_rvv_vget_v_u16m2_u16m1:
case RISCV::BI__builtin_rvv_vget_v_u32m2_u32m1:
case RISCV::BI__builtin_rvv_vget_v_u64m2_u64m1:
case RISCV::BI__builtin_rvv_vget_v_i8m4_i8m2:
case RISCV::BI__builtin_rvv_vget_v_i16m4_i16m2:
case RISCV::BI__builtin_rvv_vget_v_i32m4_i32m2:
case RISCV::BI__builtin_rvv_vget_v_i64m4_i64m2:
case RISCV::BI__builtin_rvv_vget_v_f32m4_f32m2:
case RISCV::BI__builtin_rvv_vget_v_f64m4_f64m2:
case RISCV::BI__builtin_rvv_vget_v_u8m4_u8m2:
case RISCV::BI__builtin_rvv_vget_v_u16m4_u16m2:
case RISCV::BI__builtin_rvv_vget_v_u32m4_u32m2:
case RISCV::BI__builtin_rvv_vget_v_u64m4_u64m2:
case RISCV::BI__builtin_rvv_vget_v_i8m8_i8m4:
case RISCV::BI__builtin_rvv_vget_v_i16m8_i16m4:
case RISCV::BI__builtin_rvv_vget_v_i32m8_i32m4:
case RISCV::BI__builtin_rvv_vget_v_i64m8_i64m4:
case RISCV::BI__builtin_rvv_vget_v_f32m8_f32m4:
case RISCV::BI__builtin_rvv_vget_v_f64m8_f64m4:
case RISCV::BI__builtin_rvv_vget_v_u8m8_u8m4:
case RISCV::BI__builtin_rvv_vget_v_u16m8_u16m4:
case RISCV::BI__builtin_rvv_vget_v_u32m8_u32m4:
case RISCV::BI__builtin_rvv_vget_v_u64m8_u64m4:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
case RISCV::BI__builtin_rvv_vget_v_i8m4_i8m1:
case RISCV::BI__builtin_rvv_vget_v_i16m4_i16m1:
case RISCV::BI__builtin_rvv_vget_v_i32m4_i32m1:
case RISCV::BI__builtin_rvv_vget_v_i64m4_i64m1:
case RISCV::BI__builtin_rvv_vget_v_f32m4_f32m1:
case RISCV::BI__builtin_rvv_vget_v_f64m4_f64m1:
case RISCV::BI__builtin_rvv_vget_v_u8m4_u8m1:
case RISCV::BI__builtin_rvv_vget_v_u16m4_u16m1:
case RISCV::BI__builtin_rvv_vget_v_u32m4_u32m1:
case RISCV::BI__builtin_rvv_vget_v_u64m4_u64m1:
case RISCV::BI__builtin_rvv_vget_v_i8m8_i8m2:
case RISCV::BI__builtin_rvv_vget_v_i16m8_i16m2:
case RISCV::BI__builtin_rvv_vget_v_i32m8_i32m2:
case RISCV::BI__builtin_rvv_vget_v_i64m8_i64m2:
case RISCV::BI__builtin_rvv_vget_v_f32m8_f32m2:
case RISCV::BI__builtin_rvv_vget_v_f64m8_f64m2:
case RISCV::BI__builtin_rvv_vget_v_u8m8_u8m2:
case RISCV::BI__builtin_rvv_vget_v_u16m8_u16m2:
case RISCV::BI__builtin_rvv_vget_v_u32m8_u32m2:
case RISCV::BI__builtin_rvv_vget_v_u64m8_u64m2:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 3);
case RISCV::BI__builtin_rvv_vget_v_i8m8_i8m1:
case RISCV::BI__builtin_rvv_vget_v_i16m8_i16m1:
case RISCV::BI__builtin_rvv_vget_v_i32m8_i32m1:
case RISCV::BI__builtin_rvv_vget_v_i64m8_i64m1:
case RISCV::BI__builtin_rvv_vget_v_f32m8_f32m1:
case RISCV::BI__builtin_rvv_vget_v_f64m8_f64m1:
case RISCV::BI__builtin_rvv_vget_v_u8m8_u8m1:
case RISCV::BI__builtin_rvv_vget_v_u16m8_u16m1:
case RISCV::BI__builtin_rvv_vget_v_u32m8_u32m1:
case RISCV::BI__builtin_rvv_vget_v_u64m8_u64m1:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 7);
case RISCV::BI__builtin_rvv_vset_v_i8m1_i8m2:
case RISCV::BI__builtin_rvv_vset_v_i16m1_i16m2:
case RISCV::BI__builtin_rvv_vset_v_i32m1_i32m2:
case RISCV::BI__builtin_rvv_vset_v_i64m1_i64m2:
case RISCV::BI__builtin_rvv_vset_v_f32m1_f32m2:
case RISCV::BI__builtin_rvv_vset_v_f64m1_f64m2:
case RISCV::BI__builtin_rvv_vset_v_u8m1_u8m2:
case RISCV::BI__builtin_rvv_vset_v_u16m1_u16m2:
case RISCV::BI__builtin_rvv_vset_v_u32m1_u32m2:
case RISCV::BI__builtin_rvv_vset_v_u64m1_u64m2:
case RISCV::BI__builtin_rvv_vset_v_i8m2_i8m4:
case RISCV::BI__builtin_rvv_vset_v_i16m2_i16m4:
case RISCV::BI__builtin_rvv_vset_v_i32m2_i32m4:
case RISCV::BI__builtin_rvv_vset_v_i64m2_i64m4:
case RISCV::BI__builtin_rvv_vset_v_f32m2_f32m4:
case RISCV::BI__builtin_rvv_vset_v_f64m2_f64m4:
case RISCV::BI__builtin_rvv_vset_v_u8m2_u8m4:
case RISCV::BI__builtin_rvv_vset_v_u16m2_u16m4:
case RISCV::BI__builtin_rvv_vset_v_u32m2_u32m4:
case RISCV::BI__builtin_rvv_vset_v_u64m2_u64m4:
case RISCV::BI__builtin_rvv_vset_v_i8m4_i8m8:
case RISCV::BI__builtin_rvv_vset_v_i16m4_i16m8:
case RISCV::BI__builtin_rvv_vset_v_i32m4_i32m8:
case RISCV::BI__builtin_rvv_vset_v_i64m4_i64m8:
case RISCV::BI__builtin_rvv_vset_v_f32m4_f32m8:
case RISCV::BI__builtin_rvv_vset_v_f64m4_f64m8:
case RISCV::BI__builtin_rvv_vset_v_u8m4_u8m8:
case RISCV::BI__builtin_rvv_vset_v_u16m4_u16m8:
case RISCV::BI__builtin_rvv_vset_v_u32m4_u32m8:
case RISCV::BI__builtin_rvv_vset_v_u64m4_u64m8:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
case RISCV::BI__builtin_rvv_vset_v_i8m1_i8m4:
case RISCV::BI__builtin_rvv_vset_v_i16m1_i16m4:
case RISCV::BI__builtin_rvv_vset_v_i32m1_i32m4:
case RISCV::BI__builtin_rvv_vset_v_i64m1_i64m4:
case RISCV::BI__builtin_rvv_vset_v_f32m1_f32m4:
case RISCV::BI__builtin_rvv_vset_v_f64m1_f64m4:
case RISCV::BI__builtin_rvv_vset_v_u8m1_u8m4:
case RISCV::BI__builtin_rvv_vset_v_u16m1_u16m4:
case RISCV::BI__builtin_rvv_vset_v_u32m1_u32m4:
case RISCV::BI__builtin_rvv_vset_v_u64m1_u64m4:
case RISCV::BI__builtin_rvv_vset_v_i8m2_i8m8:
case RISCV::BI__builtin_rvv_vset_v_i16m2_i16m8:
case RISCV::BI__builtin_rvv_vset_v_i32m2_i32m8:
case RISCV::BI__builtin_rvv_vset_v_i64m2_i64m8:
case RISCV::BI__builtin_rvv_vset_v_f32m2_f32m8:
case RISCV::BI__builtin_rvv_vset_v_f64m2_f64m8:
case RISCV::BI__builtin_rvv_vset_v_u8m2_u8m8:
case RISCV::BI__builtin_rvv_vset_v_u16m2_u16m8:
case RISCV::BI__builtin_rvv_vset_v_u32m2_u32m8:
case RISCV::BI__builtin_rvv_vset_v_u64m2_u64m8:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 3);
case RISCV::BI__builtin_rvv_vset_v_i8m1_i8m8:
case RISCV::BI__builtin_rvv_vset_v_i16m1_i16m8:
case RISCV::BI__builtin_rvv_vset_v_i32m1_i32m8:
case RISCV::BI__builtin_rvv_vset_v_i64m1_i64m8:
case RISCV::BI__builtin_rvv_vset_v_f32m1_f32m8:
case RISCV::BI__builtin_rvv_vset_v_f64m1_f64m8:
case RISCV::BI__builtin_rvv_vset_v_u8m1_u8m8:
case RISCV::BI__builtin_rvv_vset_v_u16m1_u16m8:
case RISCV::BI__builtin_rvv_vset_v_u32m1_u32m8:
case RISCV::BI__builtin_rvv_vset_v_u64m1_u64m8:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 7);
}

return false;
3724}

3726bool Sema::CheckSystemZBuiltinFunctionCall(unsigned BuiltinID,
                                         CallExpr *TheCall) {
if (BuiltinID == SystemZ::BI__builtin_tabort) {
  Expr *Arg = TheCall->getArg(0);
  if (Optional<llvm::APSInt> AbortCode = Arg->getIntegerConstantExpr(Context))
    if (AbortCode->getSExtValue() >= 0 && AbortCode->getSExtValue() < 256)
      return Diag(Arg->getBeginLoc(), diag::err_systemz_invalid_tabort_code)
             << Arg->getSourceRange();
}

// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
unsigned i = 0, l = 0, u = 0;
switch (BuiltinID) {
default: return false;
case SystemZ::BI__builtin_s390_lcbb: i = 1; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_verimb:
case SystemZ::BI__builtin_s390_verimh:
case SystemZ::BI__builtin_s390_verimf:
case SystemZ::BI__builtin_s390_verimg: i = 3; l = 0; u = 255; break;
case SystemZ::BI__builtin_s390_vfaeb:
case SystemZ::BI__builtin_s390_vfaeh:
case SystemZ::BI__builtin_s390_vfaef:
case SystemZ::BI__builtin_s390_vfaebs:
case SystemZ::BI__builtin_s390_vfaehs:
case SystemZ::BI__builtin_s390_vfaefs:
case SystemZ::BI__builtin_s390_vfaezb:
case SystemZ::BI__builtin_s390_vfaezh:
case SystemZ::BI__builtin_s390_vfaezf:
case SystemZ::BI__builtin_s390_vfaezbs:
case SystemZ::BI__builtin_s390_vfaezhs:
case SystemZ::BI__builtin_s390_vfaezfs: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vfisb:
case SystemZ::BI__builtin_s390_vfidb:
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15) ||
         SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
case SystemZ::BI__builtin_s390_vftcisb:
case SystemZ::BI__builtin_s390_vftcidb: i = 1; l = 0; u = 4095; break;
case SystemZ::BI__builtin_s390_vlbb: i = 1; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vpdi: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vsldb: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vstrcb:
case SystemZ::BI__builtin_s390_vstrch:
case SystemZ::BI__builtin_s390_vstrcf:
case SystemZ::BI__builtin_s390_vstrczb:
case SystemZ::BI__builtin_s390_vstrczh:
case SystemZ::BI__builtin_s390_vstrczf:
case SystemZ::BI__builtin_s390_vstrcbs:
case SystemZ::BI__builtin_s390_vstrchs:
case SystemZ::BI__builtin_s390_vstrcfs:
case SystemZ::BI__builtin_s390_vstrczbs:
case SystemZ::BI__builtin_s390_vstrczhs:
case SystemZ::BI__builtin_s390_vstrczfs: i = 3; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vmslg: i = 3; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vfminsb:
case SystemZ::BI__builtin_s390_vfmaxsb:
case SystemZ::BI__builtin_s390_vfmindb:
case SystemZ::BI__builtin_s390_vfmaxdb: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vsld: i = 2; l = 0; u = 7; break;
case SystemZ::BI__builtin_s390_vsrd: i = 2; l = 0; u = 7; break;
case SystemZ::BI__builtin_s390_vclfnhs:
case SystemZ::BI__builtin_s390_vclfnls:
case SystemZ::BI__builtin_s390_vcfn:
case SystemZ::BI__builtin_s390_vcnf: i = 1; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vcrnfs: i = 2; l = 0; u = 15; break;
}
return SemaBuiltinConstantArgRange(TheCall, i, l, u);
3793}

3795/// SemaBuiltinCpuSupports - Handle __builtin_cpu_supports(char *).
3796/// This checks that the target supports __builtin_cpu_supports and
3797/// that the string argument is constant and valid.
3798static bool SemaBuiltinCpuSupports(Sema &S, const TargetInfo &TI,
                                 CallExpr *TheCall) {
Expr *Arg = TheCall->getArg(0);

// Check if the argument is a string literal.
if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
  return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
         << Arg->getSourceRange();

// Check the contents of the string.
StringRef Feature =
    cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
if (!TI.validateCpuSupports(Feature))
  return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_supports)
         << Arg->getSourceRange();
return false;
3814}

3816/// SemaBuiltinCpuIs - Handle __builtin_cpu_is(char *).
3817/// This checks that the target supports __builtin_cpu_is and
3818/// that the string argument is constant and valid.
3819static bool SemaBuiltinCpuIs(Sema &S, const TargetInfo &TI, CallExpr *TheCall) {
Expr *Arg = TheCall->getArg(0);

// Check if the argument is a string literal.
if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
  return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
         << Arg->getSourceRange();

// Check the contents of the string.
StringRef Feature =
    cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
if (!TI.validateCpuIs(Feature))
  return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_is)
         << Arg->getSourceRange();
return false;
3834}

3836// Check if the rounding mode is legal.
3837bool Sema::CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall) {
// Indicates if this instruction has rounding control or just SAE.
bool HasRC = false;

unsigned ArgNum = 0;
switch (BuiltinID) {
default:
  return false;
case X86::BI__builtin_ia32_vcvttsd2si32:
case X86::BI__builtin_ia32_vcvttsd2si64:
case X86::BI__builtin_ia32_vcvttsd2usi32:
case X86::BI__builtin_ia32_vcvttsd2usi64:
case X86::BI__builtin_ia32_vcvttss2si32:
case X86::BI__builtin_ia32_vcvttss2si64:
case X86::BI__builtin_ia32_vcvttss2usi32:
case X86::BI__builtin_ia32_vcvttss2usi64:
  ArgNum = 1;
  break;
case X86::BI__builtin_ia32_maxpd512:
case X86::BI__builtin_ia32_maxps512:
case X86::BI__builtin_ia32_minpd512:
case X86::BI__builtin_ia32_minps512:
  ArgNum = 2;
  break;
case X86::BI__builtin_ia32_cvtps2pd512_mask:
case X86::BI__builtin_ia32_cvttpd2dq512_mask:
case X86::BI__builtin_ia32_cvttpd2qq512_mask:
case X86::BI__builtin_ia32_cvttpd2udq512_mask:
case X86::BI__builtin_ia32_cvttpd2uqq512_mask:
case X86::BI__builtin_ia32_cvttps2dq512_mask:
case X86::BI__builtin_ia32_cvttps2qq512_mask:
case X86::BI__builtin_ia32_cvttps2udq512_mask:
case X86::BI__builtin_ia32_cvttps2uqq512_mask:
case X86::BI__builtin_ia32_exp2pd_mask:
case X86::BI__builtin_ia32_exp2ps_mask:
case X86::BI__builtin_ia32_getexppd512_mask:
case X86::BI__builtin_ia32_getexpps512_mask:
case X86::BI__builtin_ia32_rcp28pd_mask:
case X86::BI__builtin_ia32_rcp28ps_mask:
case X86::BI__builtin_ia32_rsqrt28pd_mask:
case X86::BI__builtin_ia32_rsqrt28ps_mask:
case X86::BI__builtin_ia32_vcomisd:
case X86::BI__builtin_ia32_vcomiss:
case X86::BI__builtin_ia32_vcvtph2ps512_mask:
  ArgNum = 3;
  break;
case X86::BI__builtin_ia32_cmppd512_mask:
case X86::BI__builtin_ia32_cmpps512_mask:
case X86::BI__builtin_ia32_cmpsd_mask:
case X86::BI__builtin_ia32_cmpss_mask:
case X86::BI__builtin_ia32_cvtss2sd_round_mask:
case X86::BI__builtin_ia32_getexpsd128_round_mask:
case X86::BI__builtin_ia32_getexpss128_round_mask:
case X86::BI__builtin_ia32_getmantpd512_mask:
case X86::BI__builtin_ia32_getmantps512_mask:
case X86::BI__builtin_ia32_maxsd_round_mask:
case X86::BI__builtin_ia32_maxss_round_mask:
case X86::BI__builtin_ia32_minsd_round_mask:
case X86::BI__builtin_ia32_minss_round_mask:
case X86::BI__builtin_ia32_rcp28sd_round_mask:
case X86::BI__builtin_ia32_rcp28ss_round_mask:
case X86::BI__builtin_ia32_reducepd512_mask:
case X86::BI__builtin_ia32_reduceps512_mask:
case X86::BI__builtin_ia32_rndscalepd_mask:
case X86::BI__builtin_ia32_rndscaleps_mask:
case X86::BI__builtin_ia32_rsqrt28sd_round_mask:
case X86::BI__builtin_ia32_rsqrt28ss_round_mask:
  ArgNum = 4;
  break;
case X86::BI__builtin_ia32_fixupimmpd512_mask:
case X86::BI__builtin_ia32_fixupimmpd512_maskz:
case X86::BI__builtin_ia32_fixupimmps512_mask:
case X86::BI__builtin_ia32_fixupimmps512_maskz:
case X86::BI__builtin_ia32_fixupimmsd_mask:
case X86::BI__builtin_ia32_fixupimmsd_maskz:
case X86::BI__builtin_ia32_fixupimmss_mask:
case X86::BI__builtin_ia32_fixupimmss_maskz:
case X86::BI__builtin_ia32_getmantsd_round_mask:
case X86::BI__builtin_ia32_getmantss_round_mask:
case X86::BI__builtin_ia32_rangepd512_mask:
case X86::BI__builtin_ia32_rangeps512_mask:
case X86::BI__builtin_ia32_rangesd128_round_mask:
case X86::BI__builtin_ia32_rangess128_round_mask:
case X86::BI__builtin_ia32_reducesd_mask:
case X86::BI__builtin_ia32_reducess_mask:
case X86::BI__builtin_ia32_rndscalesd_round_mask:
case X86::BI__builtin_ia32_rndscaless_round_mask:
  ArgNum = 5;
  break;
case X86::BI__builtin_ia32_vcvtsd2si64:
case X86::BI__builtin_ia32_vcvtsd2si32:
case X86::BI__builtin_ia32_vcvtsd2usi32:
case X86::BI__builtin_ia32_vcvtsd2usi64:
case X86::BI__builtin_ia32_vcvtss2si32:
case X86::BI__builtin_ia32_vcvtss2si64:
case X86::BI__builtin_ia32_vcvtss2usi32:
case X86::BI__builtin_ia32_vcvtss2usi64:
case X86::BI__builtin_ia32_sqrtpd512:
case X86::BI__builtin_ia32_sqrtps512:
  ArgNum = 1;
  HasRC = true;
  break;
case X86::BI__builtin_ia32_addpd512:
case X86::BI__builtin_ia32_addps512:
case X86::BI__builtin_ia32_divpd512:
case X86::BI__builtin_ia32_divps512:
case X86::BI__builtin_ia32_mulpd512:
case X86::BI__builtin_ia32_mulps512:
case X86::BI__builtin_ia32_subpd512:
case X86::BI__builtin_ia32_subps512:
case X86::BI__builtin_ia32_cvtsi2sd64:
case X86::BI__builtin_ia32_cvtsi2ss32:
case X86::BI__builtin_ia32_cvtsi2ss64:
case X86::BI__builtin_ia32_cvtusi2sd64:
case X86::BI__builtin_ia32_cvtusi2ss32:
case X86::BI__builtin_ia32_cvtusi2ss64:
  ArgNum = 2;
  HasRC = true;
  break;
case X86::BI__builtin_ia32_cvtdq2ps512_mask:
case X86::BI__builtin_ia32_cvtudq2ps512_mask:
case X86::BI__builtin_ia32_cvtpd2ps512_mask:
case X86::BI__builtin_ia32_cvtpd2dq512_mask:
case X86::BI__builtin_ia32_cvtpd2qq512_mask:
case X86::BI__builtin_ia32_cvtpd2udq512_mask:
case X86::BI__builtin_ia32_cvtpd2uqq512_mask:
case X86::BI__builtin_ia32_cvtps2dq512_mask:
case X86::BI__builtin_ia32_cvtps2qq512_mask:
case X86::BI__builtin_ia32_cvtps2udq512_mask:
case X86::BI__builtin_ia32_cvtps2uqq512_mask:
case X86::BI__builtin_ia32_cvtqq2pd512_mask:
case X86::BI__builtin_ia32_cvtqq2ps512_mask:
case X86::BI__builtin_ia32_cvtuqq2pd512_mask:
case X86::BI__builtin_ia32_cvtuqq2ps512_mask:
  ArgNum = 3;
  HasRC = true;
  break;
case X86::BI__builtin_ia32_addss_round_mask:
case X86::BI__builtin_ia32_addsd_round_mask:
case X86::BI__builtin_ia32_divss_round_mask:
case X86::BI__builtin_ia32_divsd_round_mask:
case X86::BI__builtin_ia32_mulss_round_mask:
case X86::BI__builtin_ia32_mulsd_round_mask:
case X86::BI__builtin_ia32_subss_round_mask:
case X86::BI__builtin_ia32_subsd_round_mask:
case X86::BI__builtin_ia32_scalefpd512_mask:
case X86::BI__builtin_ia32_scalefps512_mask:
case X86::BI__builtin_ia32_scalefsd_round_mask:
case X86::BI__builtin_ia32_scalefss_round_mask:
case X86::BI__builtin_ia32_cvtsd2ss_round_mask:
case X86::BI__builtin_ia32_sqrtsd_round_mask:
case X86::BI__builtin_ia32_sqrtss_round_mask:
case X86::BI__builtin_ia32_vfmaddsd3_mask:
case X86::BI__builtin_ia32_vfmaddsd3_maskz:
case X86::BI__builtin_ia32_vfmaddsd3_mask3:
case X86::BI__builtin_ia32_vfmaddss3_mask:
case X86::BI__builtin_ia32_vfmaddss3_maskz:
case X86::BI__builtin_ia32_vfmaddss3_mask3:
case X86::BI__builtin_ia32_vfmaddpd512_mask:
case X86::BI__builtin_ia32_vfmaddpd512_maskz:
case X86::BI__builtin_ia32_vfmaddpd512_mask3:
case X86::BI__builtin_ia32_vfmsubpd512_mask3:
case X86::BI__builtin_ia32_vfmaddps512_mask:
case X86::BI__builtin_ia32_vfmaddps512_maskz:
case X86::BI__builtin_ia32_vfmaddps512_mask3:
case X86::BI__builtin_ia32_vfmsubps512_mask3:
case X86::BI__builtin_ia32_vfmaddsubpd512_mask:
case X86::BI__builtin_ia32_vfmaddsubpd512_maskz:
case X86::BI__builtin_ia32_vfmaddsubpd512_mask3:
case X86::BI__builtin_ia32_vfmsubaddpd512_mask3:
case X86::BI__builtin_ia32_vfmaddsubps512_mask:
case X86::BI__builtin_ia32_vfmaddsubps512_maskz:
case X86::BI__builtin_ia32_vfmaddsubps512_mask3:
case X86::BI__builtin_ia32_vfmsubaddps512_mask3:
  ArgNum = 4;
  HasRC = true;
  break;
}

llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

// Make sure rounding mode is either ROUND_CUR_DIRECTION or ROUND_NO_EXC bit
// is set. If the intrinsic has rounding control(bits 1:0), make sure its only
// combined with ROUND_NO_EXC. If the intrinsic does not have rounding
// control, allow ROUND_NO_EXC and ROUND_CUR_DIRECTION together.
if (Result == 4/*ROUND_CUR_DIRECTION*/ ||
    Result == 8/*ROUND_NO_EXC*/ ||
    (!HasRC && Result == 12/*ROUND_CUR_DIRECTION|ROUND_NO_EXC*/) ||
    (HasRC && Result.getZExtValue() >= 8 && Result.getZExtValue() <= 11))
  return false;

return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_rounding)
       << Arg->getSourceRange();
4039}

4041// Check if the gather/scatter scale is legal.
4042bool Sema::CheckX86BuiltinGatherScatterScale(unsigned BuiltinID,
                                           CallExpr *TheCall) {
unsigned ArgNum = 0;
switch (BuiltinID) {
default:
  return false;
case X86::BI__builtin_ia32_gatherpfdpd:
case X86::BI__builtin_ia32_gatherpfdps:
case X86::BI__builtin_ia32_gatherpfqpd:
case X86::BI__builtin_ia32_gatherpfqps:
case X86::BI__builtin_ia32_scatterpfdpd:
case X86::BI__builtin_ia32_scatterpfdps:
case X86::BI__builtin_ia32_scatterpfqpd:
case X86::BI__builtin_ia32_scatterpfqps:
  ArgNum = 3;
  break;
case X86::BI__builtin_ia32_gatherd_pd:
case X86::BI__builtin_ia32_gatherd_pd256:
case X86::BI__builtin_ia32_gatherq_pd:
case X86::BI__builtin_ia32_gatherq_pd256:
case X86::BI__builtin_ia32_gatherd_ps:
case X86::BI__builtin_ia32_gatherd_ps256:
case X86::BI__builtin_ia32_gatherq_ps:
case X86::BI__builtin_ia32_gatherq_ps256:
case X86::BI__builtin_ia32_gatherd_q:
case X86::BI__builtin_ia32_gatherd_q256:
case X86::BI__builtin_ia32_gatherq_q:
case X86::BI__builtin_ia32_gatherq_q256:
case X86::BI__builtin_ia32_gatherd_d:
case X86::BI__builtin_ia32_gatherd_d256:
case X86::BI__builtin_ia32_gatherq_d:
case X86::BI__builtin_ia32_gatherq_d256:
case X86::BI__builtin_ia32_gather3div2df:
case X86::BI__builtin_ia32_gather3div2di:
case X86::BI__builtin_ia32_gather3div4df:
case X86::BI__builtin_ia32_gather3div4di:
case X86::BI__builtin_ia32_gather3div4sf:
case X86::BI__builtin_ia32_gather3div4si:
case X86::BI__builtin_ia32_gather3div8sf:
case X86::BI__builtin_ia32_gather3div8si:
case X86::BI__builtin_ia32_gather3siv2df:
case X86::BI__builtin_ia32_gather3siv2di:
case X86::BI__builtin_ia32_gather3siv4df:
case X86::BI__builtin_ia32_gather3siv4di:
case X86::BI__builtin_ia32_gather3siv4sf:
case X86::BI__builtin_ia32_gather3siv4si:
case X86::BI__builtin_ia32_gather3siv8sf:
case X86::BI__builtin_ia32_gather3siv8si:
case X86::BI__builtin_ia32_gathersiv8df:
case X86::BI__builtin_ia32_gathersiv16sf:
case X86::BI__builtin_ia32_gatherdiv8df:
case X86::BI__builtin_ia32_gatherdiv16sf:
case X86::BI__builtin_ia32_gathersiv8di:
case X86::BI__builtin_ia32_gathersiv16si:
case X86::BI__builtin_ia32_gatherdiv8di:
case X86::BI__builtin_ia32_gatherdiv16si:
case X86::BI__builtin_ia32_scatterdiv2df:
case X86::BI__builtin_ia32_scatterdiv2di:
case X86::BI__builtin_ia32_scatterdiv4df:
case X86::BI__builtin_ia32_scatterdiv4di:
case X86::BI__builtin_ia32_scatterdiv4sf:
case X86::BI__builtin_ia32_scatterdiv4si:
case X86::BI__builtin_ia32_scatterdiv8sf:
case X86::BI__builtin_ia32_scatterdiv8si:
case X86::BI__builtin_ia32_scattersiv2df:
case X86::BI__builtin_ia32_scattersiv2di:
case X86::BI__builtin_ia32_scattersiv4df:
case X86::BI__builtin_ia32_scattersiv4di:
case X86::BI__builtin_ia32_scattersiv4sf:
case X86::BI__builtin_ia32_scattersiv4si:
case X86::BI__builtin_ia32_scattersiv8sf:
case X86::BI__builtin_ia32_scattersiv8si:
case X86::BI__builtin_ia32_scattersiv8df:
case X86::BI__builtin_ia32_scattersiv16sf:
case X86::BI__builtin_ia32_scatterdiv8df:
case X86::BI__builtin_ia32_scatterdiv16sf:
case X86::BI__builtin_ia32_scattersiv8di:
case X86::BI__builtin_ia32_scattersiv16si:
case X86::BI__builtin_ia32_scatterdiv8di:
case X86::BI__builtin_ia32_scatterdiv16si:
  ArgNum = 4;
  break;
}

llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

if (Result == 1 || Result == 2 || Result == 4 || Result == 8)
  return false;

return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_scale)
       << Arg->getSourceRange();
4142}

4144enum { TileRegLow = 0, TileRegHigh = 7 };

4146bool Sema::CheckX86BuiltinTileArgumentsRange(CallExpr *TheCall,
                                           ArrayRef<int> ArgNums) {
for (int ArgNum : ArgNums) {
  if (SemaBuiltinConstantArgRange(TheCall, ArgNum, TileRegLow, TileRegHigh))
    return true;
}
return false;
4153}

4155bool Sema::CheckX86BuiltinTileDuplicate(CallExpr *TheCall,
                                      ArrayRef<int> ArgNums) {
// Because the max number of tile register is TileRegHigh + 1, so here we use
// each bit to represent the usage of them in bitset.
std::bitset<TileRegHigh + 1> ArgValues;
for (int ArgNum : ArgNums) {
  Expr *Arg = TheCall->getArg(ArgNum);
  if (Arg->isTypeDependent() || Arg->isValueDependent())
    continue;

  llvm::APSInt Result;
  if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
    return true;
  int ArgExtValue = Result.getExtValue();
  assert((ArgExtValue >= TileRegLow || ArgExtValue <= TileRegHigh) &&((void)0)
         "Incorrect tile register num.")((void)0);
  if (ArgValues.test(ArgExtValue))
    return Diag(TheCall->getBeginLoc(),
                diag::err_x86_builtin_tile_arg_duplicate)
           << TheCall->getArg(ArgNum)->getSourceRange();
  ArgValues.set(ArgExtValue);
}
return false;
4178}

4180bool Sema::CheckX86BuiltinTileRangeAndDuplicate(CallExpr *TheCall,
                                              ArrayRef<int> ArgNums) {
return CheckX86BuiltinTileArgumentsRange(TheCall, ArgNums) ||
       CheckX86BuiltinTileDuplicate(TheCall, ArgNums);
4184}

4186bool Sema::CheckX86BuiltinTileArguments(unsigned BuiltinID, CallExpr *TheCall) {
switch (BuiltinID) {
default:
  return false;
case X86::BI__builtin_ia32_tileloadd64:
case X86::BI__builtin_ia32_tileloaddt164:
case X86::BI__builtin_ia32_tilestored64:
case X86::BI__builtin_ia32_tilezero:
  return CheckX86BuiltinTileArgumentsRange(TheCall, 0);
case X86::BI__builtin_ia32_tdpbssd:
case X86::BI__builtin_ia32_tdpbsud:
case X86::BI__builtin_ia32_tdpbusd:
case X86::BI__builtin_ia32_tdpbuud:
case X86::BI__builtin_ia32_tdpbf16ps:
  return CheckX86BuiltinTileRangeAndDuplicate(TheCall, {0, 1, 2});
}
4202}
4203static bool isX86_32Builtin(unsigned BuiltinID) {
// These builtins only work on x86-32 targets.
switch (BuiltinID) {
case X86::BI__builtin_ia32_readeflags_u32:
case X86::BI__builtin_ia32_writeeflags_u32:
  return true;
}

return false;
4212}

4214bool Sema::CheckX86BuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
                                     CallExpr *TheCall) {
if (BuiltinID == X86::BI__builtin_cpu_supports)
  return SemaBuiltinCpuSupports(*this, TI, TheCall);

if (BuiltinID == X86::BI__builtin_cpu_is)
  return SemaBuiltinCpuIs(*this, TI, TheCall);

// Check for 32-bit only builtins on a 64-bit target.
const llvm::Triple &TT = TI.getTriple();
if (TT.getArch() != llvm::Triple::x86 && isX86_32Builtin(BuiltinID))
  return Diag(TheCall->getCallee()->getBeginLoc(),
              diag::err_32_bit_builtin_64_bit_tgt);

// If the intrinsic has rounding or SAE make sure its valid.
if (CheckX86BuiltinRoundingOrSAE(BuiltinID, TheCall))
  return true;

// If the intrinsic has a gather/scatter scale immediate make sure its valid.
if (CheckX86BuiltinGatherScatterScale(BuiltinID, TheCall))
  return true;

// If the intrinsic has a tile arguments, make sure they are valid.
if (CheckX86BuiltinTileArguments(BuiltinID, TheCall))
  return true;

// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
int i = 0, l = 0, u = 0;
switch (BuiltinID) {
default:
  return false;
case X86::BI__builtin_ia32_vec_ext_v2si:
case X86::BI__builtin_ia32_vec_ext_v2di:
case X86::BI__builtin_ia32_vextractf128_pd256:
case X86::BI__builtin_ia32_vextractf128_ps256:
case X86::BI__builtin_ia32_vextractf128_si256:
case X86::BI__builtin_ia32_extract128i256:
case X86::BI__builtin_ia32_extractf64x4_mask:
case X86::BI__builtin_ia32_extracti64x4_mask:
case X86::BI__builtin_ia32_extractf32x8_mask:
case X86::BI__builtin_ia32_extracti32x8_mask:
case X86::BI__builtin_ia32_extractf64x2_256_mask:
case X86::BI__builtin_ia32_extracti64x2_256_mask:
case X86::BI__builtin_ia32_extractf32x4_256_mask:
case X86::BI__builtin_ia32_extracti32x4_256_mask:
  i = 1; l = 0; u = 1;
  break;
case X86::BI__builtin_ia32_vec_set_v2di:
case X86::BI__builtin_ia32_vinsertf128_pd256:
case X86::BI__builtin_ia32_vinsertf128_ps256:
case X86::BI__builtin_ia32_vinsertf128_si256:
case X86::BI__builtin_ia32_insert128i256:
case X86::BI__builtin_ia32_insertf32x8:
case X86::BI__builtin_ia32_inserti32x8:
case X86::BI__builtin_ia32_insertf64x4:
case X86::BI__builtin_ia32_inserti64x4:
case X86::BI__builtin_ia32_insertf64x2_256:
case X86::BI__builtin_ia32_inserti64x2_256:
case X86::BI__builtin_ia32_insertf32x4_256:
case X86::BI__builtin_ia32_inserti32x4_256:
  i = 2; l = 0; u = 1;
  break;
case X86::BI__builtin_ia32_vpermilpd:
case X86::BI__builtin_ia32_vec_ext_v4hi:
case X86::BI__builtin_ia32_vec_ext_v4si:
case X86::BI__builtin_ia32_vec_ext_v4sf:
case X86::BI__builtin_ia32_vec_ext_v4di:
case X86::BI__builtin_ia32_extractf32x4_mask:
case X86::BI__builtin_ia32_extracti32x4_mask:
case X86::BI__builtin_ia32_extractf64x2_512_mask:
case X86::BI__builtin_ia32_extracti64x2_512_mask:
  i = 1; l = 0; u = 3;
  break;
case X86::BI_mm_prefetch:
case X86::BI__builtin_ia32_vec_ext_v8hi:
case X86::BI__builtin_ia32_vec_ext_v8si:
  i = 1; l = 0; u = 7;
  break;
case X86::BI__builtin_ia32_sha1rnds4:
case X86::BI__builtin_ia32_blendpd:
case X86::BI__builtin_ia32_shufpd:
case X86::BI__builtin_ia32_vec_set_v4hi:
case X86::BI__builtin_ia32_vec_set_v4si:
case X86::BI__builtin_ia32_vec_set_v4di:
case X86::BI__builtin_ia32_shuf_f32x4_256:
case X86::BI__builtin_ia32_shuf_f64x2_256:
case X86::BI__builtin_ia32_shuf_i32x4_256:
case X86::BI__builtin_ia32_shuf_i64x2_256:
case X86::BI__builtin_ia32_insertf64x2_512:
case X86::BI__builtin_ia32_inserti64x2_512:
case X86::BI__builtin_ia32_insertf32x4:
case X86::BI__builtin_ia32_inserti32x4:
  i = 2; l = 0; u = 3;
  break;
case X86::BI__builtin_ia32_vpermil2pd:
case X86::BI__builtin_ia32_vpermil2pd256:
case X86::BI__builtin_ia32_vpermil2ps:
case X86::BI__builtin_ia32_vpermil2ps256:
  i = 3; l = 0; u = 3;
  break;
case X86::BI__builtin_ia32_cmpb128_mask:
case X86::BI__builtin_ia32_cmpw128_mask:
case X86::BI__builtin_ia32_cmpd128_mask:
case X86::BI__builtin_ia32_cmpq128_mask:
case X86::BI__builtin_ia32_cmpb256_mask:
case X86::BI__builtin_ia32_cmpw256_mask:
case X86::BI__builtin_ia32_cmpd256_mask:
case X86::BI__builtin_ia32_cmpq256_mask:
case X86::BI__builtin_ia32_cmpb512_mask:
case X86::BI__builtin_ia32_cmpw512_mask:
case X86::BI__builtin_ia32_cmpd512_mask:
case X86::BI__builtin_ia32_cmpq512_mask:
case X86::BI__builtin_ia32_ucmpb128_mask:
case X86::BI__builtin_ia32_ucmpw128_mask:
case X86::BI__builtin_ia32_ucmpd128_mask:
case X86::BI__builtin_ia32_ucmpq128_mask:
case X86::BI__builtin_ia32_ucmpb256_mask:
case X86::BI__builtin_ia32_ucmpw256_mask:
case X86::BI__builtin_ia32_ucmpd256_mask:
case X86::BI__builtin_ia32_ucmpq256_mask:
case X86::BI__builtin_ia32_ucmpb512_mask:
case X86::BI__builtin_ia32_ucmpw512_mask:
case X86::BI__builtin_ia32_ucmpd512_mask:
case X86::BI__builtin_ia32_ucmpq512_mask:
case X86::BI__builtin_ia32_vpcomub:
case X86::BI__builtin_ia32_vpcomuw:
case X86::BI__builtin_ia32_vpcomud:
case X86::BI__builtin_ia32_vpcomuq:
case X86::BI__builtin_ia32_vpcomb:
case X86::BI__builtin_ia32_vpcomw:
case X86::BI__builtin_ia32_vpcomd:
case X86::BI__builtin_ia32_vpcomq:
case X86::BI__builtin_ia32_vec_set_v8hi:
case X86::BI__builtin_ia32_vec_set_v8si:
  i = 2; l = 0; u = 7;
  break;
case X86::BI__builtin_ia32_vpermilpd256:
case X86::BI__builtin_ia32_roundps:
case X86::BI__builtin_ia32_roundpd:
case X86::BI__builtin_ia32_roundps256:
case X86::BI__builtin_ia32_roundpd256:
case X86::BI__builtin_ia32_getmantpd128_mask:
case X86::BI__builtin_ia32_getmantpd256_mask:
case X86::BI__builtin_ia32_getmantps128_mask:
case X86::BI__builtin_ia32_getmantps256_mask:
case X86::BI__builtin_ia32_getmantpd512_mask:
case X86::BI__builtin_ia32_getmantps512_mask:
case X86::BI__builtin_ia32_vec_ext_v16qi:
case X86::BI__builtin_ia32_vec_ext_v16hi:
  i = 1; l = 0; u = 15;
  break;
case X86::BI__builtin_ia32_pblendd128:
case X86::BI__builtin_ia32_blendps:
case X86::BI__builtin_ia32_blendpd256:
case X86::BI__builtin_ia32_shufpd256:
case X86::BI__builtin_ia32_roundss:
case X86::BI__builtin_ia32_roundsd:
case X86::BI__builtin_ia32_rangepd128_mask:
case X86::BI__builtin_ia32_rangepd256_mask:
case X86::BI__builtin_ia32_rangepd512_mask:
case X86::BI__builtin_ia32_rangeps128_mask:
case X86::BI__builtin_ia32_rangeps256_mask:
case X86::BI__builtin_ia32_rangeps512_mask:
case X86::BI__builtin_ia32_getmantsd_round_mask:
case X86::BI__builtin_ia32_getmantss_round_mask:
case X86::BI__builtin_ia32_vec_set_v16qi:
case X86::BI__builtin_ia32_vec_set_v16hi:
  i = 2; l = 0; u = 15;
  break;
case X86::BI__builtin_ia32_vec_ext_v32qi:
  i = 1; l = 0; u = 31;
  break;
case X86::BI__builtin_ia32_cmpps:
case X86::BI__builtin_ia32_cmpss:
case X86::BI__builtin_ia32_cmppd:
case X86::BI__builtin_ia32_cmpsd:
case X86::BI__builtin_ia32_cmpps256:
case X86::BI__builtin_ia32_cmppd256:
case X86::BI__builtin_ia32_cmpps128_mask:
case X86::BI__builtin_ia32_cmppd128_mask:
case X86::BI__builtin_ia32_cmpps256_mask:
case X86::BI__builtin_ia32_cmppd256_mask:
case X86::BI__builtin_ia32_cmpps512_mask:
case X86::BI__builtin_ia32_cmppd512_mask:
case X86::BI__builtin_ia32_cmpsd_mask:
case X86::BI__builtin_ia32_cmpss_mask:
case X86::BI__builtin_ia32_vec_set_v32qi:
  i = 2; l = 0; u = 31;
  break;
case X86::BI__builtin_ia32_permdf256:
case X86::BI__builtin_ia32_permdi256:
case X86::BI__builtin_ia32_permdf512:
case X86::BI__builtin_ia32_permdi512:
case X86::BI__builtin_ia32_vpermilps:
case X86::BI__builtin_ia32_vpermilps256:
case X86::BI__builtin_ia32_vpermilpd512:
case X86::BI__builtin_ia32_vpermilps512:
case X86::BI__builtin_ia32_pshufd:
case X86::BI__builtin_ia32_pshufd256:
case X86::BI__builtin_ia32_pshufd512:
case X86::BI__builtin_ia32_pshufhw:
case X86::BI__builtin_ia32_pshufhw256:
case X86::BI__builtin_ia32_pshufhw512:
case X86::BI__builtin_ia32_pshuflw:
case X86::BI__builtin_ia32_pshuflw256:
case X86::BI__builtin_ia32_pshuflw512:
case X86::BI__builtin_ia32_vcvtps2ph:
case X86::BI__builtin_ia32_vcvtps2ph_mask:
case X86::BI__builtin_ia32_vcvtps2ph256:
case X86::BI__builtin_ia32_vcvtps2ph256_mask:
case X86::BI__builtin_ia32_vcvtps2ph512_mask:
case X86::BI__builtin_ia32_rndscaleps_128_mask:
case X86::BI__builtin_ia32_rndscalepd_128_mask:
case X86::BI__builtin_ia32_rndscaleps_256_mask:
case X86::BI__builtin_ia32_rndscalepd_256_mask:
case X86::BI__builtin_ia32_rndscaleps_mask:
case X86::BI__builtin_ia32_rndscalepd_mask:
case X86::BI__builtin_ia32_reducepd128_mask:
case X86::BI__builtin_ia32_reducepd256_mask:
case X86::BI__builtin_ia32_reducepd512_mask:
case X86::BI__builtin_ia32_reduceps128_mask:
case X86::BI__builtin_ia32_reduceps256_mask:
case X86::BI__builtin_ia32_reduceps512_mask:
case X86::BI__builtin_ia32_prold512:
case X86::BI__builtin_ia32_prolq512:
case X86::BI__builtin_ia32_prold128:
case X86::BI__builtin_ia32_prold256:
case X86::BI__builtin_ia32_prolq128:
case X86::BI__builtin_ia32_prolq256:
case X86::BI__builtin_ia32_prord512:
case X86::BI__builtin_ia32_prorq512:
case X86::BI__builtin_ia32_prord128:
case X86::BI__builtin_ia32_prord256:
case X86::BI__builtin_ia32_prorq128:
case X86::BI__builtin_ia32_prorq256:
case X86::BI__builtin_ia32_fpclasspd128_mask:
case X86::BI__builtin_ia32_fpclasspd256_mask:
case X86::BI__builtin_ia32_fpclassps128_mask:
case X86::BI__builtin_ia32_fpclassps256_mask:
case X86::BI__builtin_ia32_fpclassps512_mask:
case X86::BI__builtin_ia32_fpclasspd512_mask:
case X86::BI__builtin_ia32_fpclasssd_mask:
case X86::BI__builtin_ia32_fpclassss_mask:
case X86::BI__builtin_ia32_pslldqi128_byteshift:
case X86::BI__builtin_ia32_pslldqi256_byteshift:
case X86::BI__builtin_ia32_pslldqi512_byteshift:
case X86::BI__builtin_ia32_psrldqi128_byteshift:
case X86::BI__builtin_ia32_psrldqi256_byteshift:
case X86::BI__builtin_ia32_psrldqi512_byteshift:
case X86::BI__builtin_ia32_kshiftliqi:
case X86::BI__builtin_ia32_kshiftlihi:
case X86::BI__builtin_ia32_kshiftlisi:
case X86::BI__builtin_ia32_kshiftlidi:
case X86::BI__builtin_ia32_kshiftriqi:
case X86::BI__builtin_ia32_kshiftrihi:
case X86::BI__builtin_ia32_kshiftrisi:
case X86::BI__builtin_ia32_kshiftridi:
  i = 1; l = 0; u = 255;
  break;
case X86::BI__builtin_ia32_vperm2f128_pd256:
case X86::BI__builtin_ia32_vperm2f128_ps256:
case X86::BI__builtin_ia32_vperm2f128_si256:
case X86::BI__builtin_ia32_permti256:
case X86::BI__builtin_ia32_pblendw128:
case X86::BI__builtin_ia32_pblendw256:
case X86::BI__builtin_ia32_blendps256:
case X86::BI__builtin_ia32_pblendd256:
case X86::BI__builtin_ia32_palignr128:
case X86::BI__builtin_ia32_palignr256:
case X86::BI__builtin_ia32_palignr512:
case X86::BI__builtin_ia32_alignq512:
case X86::BI__builtin_ia32_alignd512:
case X86::BI__builtin_ia32_alignd128:
case X86::BI__builtin_ia32_alignd256:
case X86::BI__builtin_ia32_alignq128:
case X86::BI__builtin_ia32_alignq256:
case X86::BI__builtin_ia32_vcomisd:
case X86::BI__builtin_ia32_vcomiss:
case X86::BI__builtin_ia32_shuf_f32x4:
case X86::BI__builtin_ia32_shuf_f64x2:
case X86::BI__builtin_ia32_shuf_i32x4:
case X86::BI__builtin_ia32_shuf_i64x2:
case X86::BI__builtin_ia32_shufpd512:
case X86::BI__builtin_ia32_shufps:
case X86::BI__builtin_ia32_shufps256:
case X86::BI__builtin_ia32_shufps512:
case X86::BI__builtin_ia32_dbpsadbw128:
case X86::BI__builtin_ia32_dbpsadbw256:
case X86::BI__builtin_ia32_dbpsadbw512:
case X86::BI__builtin_ia32_vpshldd128:
case X86::BI__builtin_ia32_vpshldd256:
case X86::BI__builtin_ia32_vpshldd512:
case X86::BI__builtin_ia32_vpshldq128:
case X86::BI__builtin_ia32_vpshldq256:
case X86::BI__builtin_ia32_vpshldq512:
case X86::BI__builtin_ia32_vpshldw128:
case X86::BI__builtin_ia32_vpshldw256:
case X86::BI__builtin_ia32_vpshldw512:
case X86::BI__builtin_ia32_vpshrdd128:
case X86::BI__builtin_ia32_vpshrdd256:
case X86::BI__builtin_ia32_vpshrdd512:
case X86::BI__builtin_ia32_vpshrdq128:
case X86::BI__builtin_ia32_vpshrdq256:
case X86::BI__builtin_ia32_vpshrdq512:
case X86::BI__builtin_ia32_vpshrdw128:
case X86::BI__builtin_ia32_vpshrdw256:
case X86::BI__builtin_ia32_vpshrdw512:
  i = 2; l = 0; u = 255;
  break;
case X86::BI__builtin_ia32_fixupimmpd512_mask:
case X86::BI__builtin_ia32_fixupimmpd512_maskz:
case X86::BI__builtin_ia32_fixupimmps512_mask:
case X86::BI__builtin_ia32_fixupimmps512_maskz:
case X86::BI__builtin_ia32_fixupimmsd_mask:
case X86::BI__builtin_ia32_fixupimmsd_maskz:
case X86::BI__builtin_ia32_fixupimmss_mask:
case X86::BI__builtin_ia32_fixupimmss_maskz:
case X86::BI__builtin_ia32_fixupimmpd128_mask:
case X86::BI__builtin_ia32_fixupimmpd128_maskz:
case X86::BI__builtin_ia32_fixupimmpd256_mask:
case X86::BI__builtin_ia32_fixupimmpd256_maskz:
case X86::BI__builtin_ia32_fixupimmps128_mask:
case X86::BI__builtin_ia32_fixupimmps128_maskz:
case X86::BI__builtin_ia32_fixupimmps256_mask:
case X86::BI__builtin_ia32_fixupimmps256_maskz:
case X86::BI__builtin_ia32_pternlogd512_mask:
case X86::BI__builtin_ia32_pternlogd512_maskz:
case X86::BI__builtin_ia32_pternlogq512_mask:
case X86::BI__builtin_ia32_pternlogq512_maskz:
case X86::BI__builtin_ia32_pternlogd128_mask:
case X86::BI__builtin_ia32_pternlogd128_maskz:
case X86::BI__builtin_ia32_pternlogd256_mask:
case X86::BI__builtin_ia32_pternlogd256_maskz:
case X86::BI__builtin_ia32_pternlogq128_mask:
case X86::BI__builtin_ia32_pternlogq128_maskz:
case X86::BI__builtin_ia32_pternlogq256_mask:
case X86::BI__builtin_ia32_pternlogq256_maskz:
  i = 3; l = 0; u = 255;
  break;
case X86::BI__builtin_ia32_gatherpfdpd:
case X86::BI__builtin_ia32_gatherpfdps:
case X86::BI__builtin_ia32_gatherpfqpd:
case X86::BI__builtin_ia32_gatherpfqps:
case X86::BI__builtin_ia32_scatterpfdpd:
case X86::BI__builtin_ia32_scatterpfdps:
case X86::BI__builtin_ia32_scatterpfqpd:
case X86::BI__builtin_ia32_scatterpfqps:
  i = 4; l = 2; u = 3;
  break;
case X86::BI__builtin_ia32_reducesd_mask:
case X86::BI__builtin_ia32_reducess_mask:
case X86::BI__builtin_ia32_rndscalesd_round_mask:
case X86::BI__builtin_ia32_rndscaless_round_mask:
  i = 4; l = 0; u = 255;
  break;
}

// Note that we don't force a hard error on the range check here, allowing
// template-generated or macro-generated dead code to potentially have out-of-
// range values. These need to code generate, but don't need to necessarily
// make any sense. We use a warning that defaults to an error.
return SemaBuiltinConstantArgRange(TheCall, i, l, u, /*RangeIsError*/ false);
4577}

4579/// Given a FunctionDecl's FormatAttr, attempts to populate the FomatStringInfo
4580/// parameter with the FormatAttr's correct format_idx and firstDataArg.
4581/// Returns true when the format fits the function and the FormatStringInfo has
4582/// been populated.
4583bool Sema::getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
                             FormatStringInfo *FSI) {
FSI->HasVAListArg = Format->getFirstArg() == 0;
FSI->FormatIdx = Format->getFormatIdx() - 1;
FSI->FirstDataArg = FSI->HasVAListArg ? 0 : Format->getFirstArg() - 1;

// The way the format attribute works in GCC, the implicit this argument
// of member functions is counted. However, it doesn't appear in our own
// lists, so decrement format_idx in that case.
if (IsCXXMember) {
  if(FSI->FormatIdx == 0)
    return false;
  --FSI->FormatIdx;
  if (FSI->FirstDataArg != 0)
    --FSI->FirstDataArg;
}
return true;
4600}

4602/// Checks if a the given expression evaluates to null.
4603///
4604/// Returns true if the value evaluates to null.
4605static bool CheckNonNullExpr(Sema &S, const Expr *Expr) {
// If the expression has non-null type, it doesn't evaluate to null.
if (auto nullability
      = Expr->IgnoreImplicit()->getType()->getNullability(S.Context)) {
  if (*nullability == NullabilityKind::NonNull)
    return false;
}

// As a special case, transparent unions initialized with zero are
// considered null for the purposes of the nonnull attribute.
if (const RecordType *UT = Expr->getType()->getAsUnionType()) {
  if (UT->getDecl()->hasAttr<TransparentUnionAttr>())
    if (const CompoundLiteralExpr *CLE =
        dyn_cast<CompoundLiteralExpr>(Expr))
      if (const InitListExpr *ILE =
          dyn_cast<InitListExpr>(CLE->getInitializer()))
        Expr = ILE->getInit(0);
}

bool Result;
return (!Expr->isValueDependent() &&
        Expr->EvaluateAsBooleanCondition(Result, S.Context) &&
        !Result);
4628}

4630static void CheckNonNullArgument(Sema &S,
                               const Expr *ArgExpr,
                               SourceLocation CallSiteLoc) {
if (CheckNonNullExpr(S, ArgExpr))
  S.DiagRuntimeBehavior(CallSiteLoc, ArgExpr,
                        S.PDiag(diag::warn_null_arg)
                            << ArgExpr->getSourceRange());
4637}

4639bool Sema::GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx) {
FormatStringInfo FSI;
if ((GetFormatStringType(Format) == FST_NSString) &&
    getFormatStringInfo(Format, false, &FSI)) {
  Idx = FSI.FormatIdx;
  return true;
}
return false;
4647}

4649/// Diagnose use of %s directive in an NSString which is being passed
4650/// as formatting string to formatting method.
4651static void
4652DiagnoseCStringFormatDirectiveInCFAPI(Sema &S,
                                      const NamedDecl *FDecl,
                                      Expr **Args,
                                      unsigned NumArgs) {
unsigned Idx = 0;
bool Format = false;
ObjCStringFormatFamily SFFamily = FDecl->getObjCFStringFormattingFamily();
if (SFFamily == ObjCStringFormatFamily::SFF_CFString) {
  Idx = 2;
  Format = true;
}
else
  for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
    if (S.GetFormatNSStringIdx(I, Idx)) {
      Format = true;
      break;
    }
  }
if (!Format || NumArgs <= Idx)
  return;
const Expr *FormatExpr = Args[Idx];
if (const CStyleCastExpr *CSCE = dyn_cast<CStyleCastExpr>(FormatExpr))
  FormatExpr = CSCE->getSubExpr();
const StringLiteral *FormatString;
if (const ObjCStringLiteral *OSL =
    dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts()))
  FormatString = OSL->getString();
else
  FormatString = dyn_cast<StringLiteral>(FormatExpr->IgnoreParenImpCasts());
if (!FormatString)
  return;
if (S.FormatStringHasSArg(FormatString)) {
  S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
    << "%s" << 1 << 1;
  S.Diag(FDecl->getLocation(), diag::note_entity_declared_at)
    << FDecl->getDeclName();
}
4689}

4691/// Determine whether the given type has a non-null nullability annotation.
4692static bool isNonNullType(ASTContext &ctx, QualType type) {
if (auto nullability = type->getNullability(ctx))
  return *nullability == NullabilityKind::NonNull;

return false;
4697}

4699static void CheckNonNullArguments(Sema &S,
                                const NamedDecl *FDecl,
                                const FunctionProtoType *Proto,
                                ArrayRef<const Expr *> Args,
                                SourceLocation CallSiteLoc) {
assert((FDecl || Proto) && "Need a function declaration or prototype")((void)0);

// Already checked by by constant evaluator.
if (S.isConstantEvaluated())
  return;
// Check the attributes attached to the method/function itself.
llvm::SmallBitVector NonNullArgs;
if (FDecl) {
  // Handle the nonnull attribute on the function/method declaration itself.
  for (const auto *NonNull : FDecl->specific_attrs<NonNullAttr>()) {
    if (!NonNull->args_size()) {
      // Easy case: all pointer arguments are nonnull.
      for (const auto *Arg : Args)
        if (S.isValidPointerAttrType(Arg->getType()))
          CheckNonNullArgument(S, Arg, CallSiteLoc);
      return;
    }

    for (const ParamIdx &Idx : NonNull->args()) {
      unsigned IdxAST = Idx.getASTIndex();
      if (IdxAST >= Args.size())
        continue;
      if (NonNullArgs.empty())
        NonNullArgs.resize(Args.size());
      NonNullArgs.set(IdxAST);
    }
  }
}

if (FDecl && (isa<FunctionDecl>(FDecl) || isa<ObjCMethodDecl>(FDecl))) {
  // Handle the nonnull attribute on the parameters of the
  // function/method.
  ArrayRef<ParmVarDecl*> parms;
  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(FDecl))
    parms = FD->parameters();
  else
    parms = cast<ObjCMethodDecl>(FDecl)->parameters();

  unsigned ParamIndex = 0;
  for (ArrayRef<ParmVarDecl*>::iterator I = parms.begin(), E = parms.end();
       I != E; ++I, ++ParamIndex) {
    const ParmVarDecl *PVD = *I;
    if (PVD->hasAttr<NonNullAttr>() ||
        isNonNullType(S.Context, PVD->getType())) {
      if (NonNullArgs.empty())
        NonNullArgs.resize(Args.size());

      NonNullArgs.set(ParamIndex);
    }
  }
} else {
  // If we have a non-function, non-method declaration but no
  // function prototype, try to dig out the function prototype.
  if (!Proto) {
    if (const ValueDecl *VD = dyn_cast<ValueDecl>(FDecl)) {
      QualType type = VD->getType().getNonReferenceType();
      if (auto pointerType = type->getAs<PointerType>())
        type = pointerType->getPointeeType();
      else if (auto blockType = type->getAs<BlockPointerType>())
        type = blockType->getPointeeType();
      // FIXME: data member pointers?

      // Dig out the function prototype, if there is one.
      Proto = type->getAs<FunctionProtoType>();
    }
  }

  // Fill in non-null argument information from the nullability
  // information on the parameter types (if we have them).
  if (Proto) {
    unsigned Index = 0;
    for (auto paramType : Proto->getParamTypes()) {
      if (isNonNullType(S.Context, paramType)) {
        if (NonNullArgs.empty())
          NonNullArgs.resize(Args.size());

        NonNullArgs.set(Index);
      }

      ++Index;
    }
  }
}

// Check for non-null arguments.
for (unsigned ArgIndex = 0, ArgIndexEnd = NonNullArgs.size();
     ArgIndex != ArgIndexEnd; ++ArgIndex) {
  if (NonNullArgs[ArgIndex])
    CheckNonNullArgument(S, Args[ArgIndex], CallSiteLoc);
}
4794}

4796/// Warn if a pointer or reference argument passed to a function points to an
4797/// object that is less aligned than the parameter. This can happen when
4798/// creating a typedef with a lower alignment than the original type and then
4799/// calling functions defined in terms of the original type.
4800void Sema::CheckArgAlignment(SourceLocation Loc, NamedDecl *FDecl,
                           StringRef ParamName, QualType ArgTy,
                           QualType ParamTy) {

// If a function accepts a pointer or reference type
if (!ParamTy->isPointerType() && !ParamTy->isReferenceType())
  return;

// If the parameter is a pointer type, get the pointee type for the
// argument too. If the parameter is a reference type, don't try to get
// the pointee type for the argument.
if (ParamTy->isPointerType())
  ArgTy = ArgTy->getPointeeType();

// Remove reference or pointer
ParamTy = ParamTy->getPointeeType();

// Find expected alignment, and the actual alignment of the passed object.
// getTypeAlignInChars requires complete types
if (ArgTy.isNull() || ParamTy->isIncompleteType() ||
    ArgTy->isIncompleteType() || ParamTy->isUndeducedType() ||
    ArgTy->isUndeducedType())
  return;

CharUnits ParamAlign = Context.getTypeAlignInChars(ParamTy);
CharUnits ArgAlign = Context.getTypeAlignInChars(ArgTy);

// If the argument is less aligned than the parameter, there is a
// potential alignment issue.
if (ArgAlign < ParamAlign)
  Diag(Loc, diag::warn_param_mismatched_alignment)
      << (int)ArgAlign.getQuantity() << (int)ParamAlign.getQuantity()
      << ParamName << FDecl;
4833}

4835/// Handles the checks for format strings, non-POD arguments to vararg
4836/// functions, NULL arguments passed to non-NULL parameters, and diagnose_if
4837/// attributes.
4838void Sema::checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
                   const Expr *ThisArg, ArrayRef<const Expr *> Args,
                   bool IsMemberFunction, SourceLocation Loc,
                   SourceRange Range, VariadicCallType CallType) {
// FIXME: We should check as much as we can in the template definition.
if (CurContext->isDependentContext())
  return;

// Printf and scanf checking.
llvm::SmallBitVector CheckedVarArgs;
if (FDecl) {
  for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
    // Only create vector if there are format attributes.
    CheckedVarArgs.resize(Args.size());

    CheckFormatArguments(I, Args, IsMemberFunction, CallType, Loc, Range,
                         CheckedVarArgs);
  }
}

// Refuse POD arguments that weren't caught by the format string
// checks above.
auto *FD = dyn_cast_or_null<FunctionDecl>(FDecl);
if (CallType != VariadicDoesNotApply &&
    (!FD || FD->getBuiltinID() != Builtin::BI__noop)) {
  unsigned NumParams = Proto ? Proto->getNumParams()
                     : FDecl && isa<FunctionDecl>(FDecl)
                         ? cast<FunctionDecl>(FDecl)->getNumParams()
                     : FDecl && isa<ObjCMethodDecl>(FDecl)
                         ? cast<ObjCMethodDecl>(FDecl)->param_size()
                     : 0;

  for (unsigned ArgIdx = NumParams; ArgIdx < Args.size(); ++ArgIdx) {
    // Args[ArgIdx] can be null in malformed code.
    if (const Expr *Arg = Args[ArgIdx]) {
      if (CheckedVarArgs.empty() || !CheckedVarArgs[ArgIdx])
        checkVariadicArgument(Arg, CallType);
    }
  }
}

if (FDecl || Proto) {
  CheckNonNullArguments(*this, FDecl, Proto, Args, Loc);

  // Type safety checking.
  if (FDecl) {
    for (const auto *I : FDecl->specific_attrs<ArgumentWithTypeTagAttr>())
      CheckArgumentWithTypeTag(I, Args, Loc);
  }
}

// Check that passed arguments match the alignment of original arguments.
// Try to get the missing prototype from the declaration.
if (!Proto && FDecl) {
  const auto *FT = FDecl->getFunctionType();
  if (isa_and_nonnull<FunctionProtoType>(FT))
    Proto = cast<FunctionProtoType>(FDecl->getFunctionType());
}
if (Proto) {
  // For variadic functions, we may have more args than parameters.
  // For some K&R functions, we may have less args than parameters.
  const auto N = std::min<unsigned>(Proto->getNumParams(), Args.size());
  for (unsigned ArgIdx = 0; ArgIdx < N; ++ArgIdx) {
    // Args[ArgIdx] can be null in malformed code.
    if (const Expr *Arg = Args[ArgIdx]) {
      if (Arg->containsErrors())
        continue;

      QualType ParamTy = Proto->getParamType(ArgIdx);
      QualType ArgTy = Arg->getType();
      CheckArgAlignment(Arg->getExprLoc(), FDecl, std::to_string(ArgIdx + 1),
                        ArgTy, ParamTy);
    }
  }
}

if (FDecl && FDecl->hasAttr<AllocAlignAttr>()) {
  auto *AA = FDecl->getAttr<AllocAlignAttr>();
  const Expr *Arg = Args[AA->getParamIndex().getASTIndex()];
  if (!Arg->isValueDependent()) {
    Expr::EvalResult Align;
    if (Arg->EvaluateAsInt(Align, Context)) {
      const llvm::APSInt &I = Align.Val.getInt();
      if (!I.isPowerOf2())
        Diag(Arg->getExprLoc(), diag::warn_alignment_not_power_of_two)
            << Arg->getSourceRange();

      if (I > Sema::MaximumAlignment)
        Diag(Arg->getExprLoc(), diag::warn_assume_aligned_too_great)
            << Arg->getSourceRange() << Sema::MaximumAlignment;
    }
  }
}

if (FD)
  diagnoseArgDependentDiagnoseIfAttrs(FD, ThisArg, Args, Loc);
4934}

4936/// CheckConstructorCall - Check a constructor call for correctness and safety
4937/// properties not enforced by the C type system.
4938void Sema::CheckConstructorCall(FunctionDecl *FDecl, QualType ThisType,
                              ArrayRef<const Expr *> Args,
                              const FunctionProtoType *Proto,
                              SourceLocation Loc) {
VariadicCallType CallType =
    Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;

auto *Ctor = cast<CXXConstructorDecl>(FDecl);
CheckArgAlignment(Loc, FDecl, "'this'", Context.getPointerType(ThisType),
                  Context.getPointerType(Ctor->getThisObjectType()));

checkCall(FDecl, Proto, /*ThisArg=*/nullptr, Args, /*IsMemberFunction=*/true,
          Loc, SourceRange(), CallType);
4951}

4953/// CheckFunctionCall - Check a direct function call for various correctness
4954/// and safety properties not strictly enforced by the C type system.
4955bool Sema::CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
                           const FunctionProtoType *Proto) {
bool IsMemberOperatorCall = isa<CXXOperatorCallExpr>(TheCall) &&
1
Assuming 'TheCall' is not a 'CXXOperatorCallExpr'→
                            isa<CXXMethodDecl>(FDecl);
bool IsMemberFunction = isa<CXXMemberCallExpr>(TheCall) ||
2
←
Assuming 'TheCall' is not a 'CXXMemberCallExpr'→
                        IsMemberOperatorCall;
VariadicCallType CallType = getVariadicCallType(FDecl, Proto,
                                                TheCall->getCallee());
Expr** Args = TheCall->getArgs();
unsigned NumArgs = TheCall->getNumArgs();

Expr *ImplicitThis = nullptr;
if (IsMemberOperatorCall2.1
'IsMemberOperatorCall' is false
) {
3
←
Taking false branch→
  // If this is a call to a member operator, hide the first argument
  // from checkCall.
  // FIXME: Our choice of AST representation here is less than ideal.
  ImplicitThis = Args[0];
  ++Args;
  --NumArgs;
} else if (IsMemberFunction3.1
'IsMemberFunction' is false
)
4
←
Taking false branch→
  ImplicitThis =
      cast<CXXMemberCallExpr>(TheCall)->getImplicitObjectArgument();

if (ImplicitThis4.1
'ImplicitThis' is null
) {
5
←
Taking false branch→
  // ImplicitThis may or may not be a pointer, depending on whether . or -> is
  // used.
  QualType ThisType = ImplicitThis->getType();
  if (!ThisType->isPointerType()) {
    assert(!ThisType->isReferenceType())((void)0);
    ThisType = Context.getPointerType(ThisType);
  }

  QualType ThisTypeFromDecl =
      Context.getPointerType(cast<CXXMethodDecl>(FDecl)->getThisObjectType());

  CheckArgAlignment(TheCall->getRParenLoc(), FDecl, "'this'", ThisType,
                    ThisTypeFromDecl);
}

checkCall(FDecl, Proto, ImplicitThis, llvm::makeArrayRef(Args, NumArgs),
          IsMemberFunction, TheCall->getRParenLoc(),
          TheCall->getCallee()->getSourceRange(), CallType);

IdentifierInfo *FnInfo = FDecl->getIdentifier();
// None of the checks below are needed for functions that don't have
// simple names (e.g., C++ conversion functions).
if (!FnInfo)
6
←
Assuming 'FnInfo' is non-null→
7
←
Taking false branch→
  return false;

CheckTCBEnforcement(TheCall, FDecl);

CheckAbsoluteValueFunction(TheCall, FDecl);
CheckMaxUnsignedZero(TheCall, FDecl);

if (getLangOpts().ObjC)
8
←
Assuming field 'ObjC' is 0→
9
←
Taking false branch→
  DiagnoseCStringFormatDirectiveInCFAPI(*this, FDecl, Args, NumArgs);

unsigned CMId = FDecl->getMemoryFunctionKind();

// Handle memory setting and copying functions.
switch (CMId) {
10
←
Control jumps to 'case BIfree:'  at line 5025→
case 0:
  return false;
case Builtin::BIstrlcpy: // fallthrough
case Builtin::BIstrlcat:
  CheckStrlcpycatArguments(TheCall, FnInfo);
  break;
case Builtin::BIstrncat:
  CheckStrncatArguments(TheCall, FnInfo);
  break;
case Builtin::BIfree:
  CheckFreeArguments(TheCall);
11
←
Calling 'Sema::CheckFreeArguments'→
  break;
default:
  CheckMemaccessArguments(TheCall, CMId, FnInfo);
}

return false;
5033}

5035bool Sema::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
                             ArrayRef<const Expr *> Args) {
VariadicCallType CallType =
    Method->isVariadic() ? VariadicMethod : VariadicDoesNotApply;

checkCall(Method, nullptr, /*ThisArg=*/nullptr, Args,
          /*IsMemberFunction=*/false, lbrac, Method->getSourceRange(),
          CallType);

return false;
5045}

5047bool Sema::CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
                          const FunctionProtoType *Proto) {
QualType Ty;
if (const auto *V = dyn_cast<VarDecl>(NDecl))
  Ty = V->getType().getNonReferenceType();
else if (const auto *F = dyn_cast<FieldDecl>(NDecl))
  Ty = F->getType().getNonReferenceType();
else
  return false;

if (!Ty->isBlockPointerType() && !Ty->isFunctionPointerType() &&
    !Ty->isFunctionProtoType())
  return false;

VariadicCallType CallType;
if (!Proto || !Proto->isVariadic()) {
  CallType = VariadicDoesNotApply;
} else if (Ty->isBlockPointerType()) {
  CallType = VariadicBlock;
} else { // Ty->isFunctionPointerType()
  CallType = VariadicFunction;
}

checkCall(NDecl, Proto, /*ThisArg=*/nullptr,
          llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
          /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
          TheCall->getCallee()->getSourceRange(), CallType);

return false;
5076}

5078/// Checks function calls when a FunctionDecl or a NamedDecl is not available,
5079/// such as function pointers returned from functions.
5080bool Sema::CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto) {
VariadicCallType CallType = getVariadicCallType(/*FDecl=*/nullptr, Proto,
                                                TheCall->getCallee());
checkCall(/*FDecl=*/nullptr, Proto, /*ThisArg=*/nullptr,
          llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
          /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
          TheCall->getCallee()->getSourceRange(), CallType);

return false;
5089}

5091static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
if (!llvm::isValidAtomicOrderingCABI(Ordering))
  return false;

auto OrderingCABI = (llvm::AtomicOrderingCABI)Ordering;
switch (Op) {
case AtomicExpr::AO__c11_atomic_init:
case AtomicExpr::AO__opencl_atomic_init:
  llvm_unreachable("There is no ordering argument for an init")__builtin_unreachable();

case AtomicExpr::AO__c11_atomic_load:
case AtomicExpr::AO__opencl_atomic_load:
case AtomicExpr::AO__atomic_load_n:
case AtomicExpr::AO__atomic_load:
  return OrderingCABI != llvm::AtomicOrderingCABI::release &&
         OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;

case AtomicExpr::AO__c11_atomic_store:
case AtomicExpr::AO__opencl_atomic_store:
case AtomicExpr::AO__atomic_store:
case AtomicExpr::AO__atomic_store_n:
  return OrderingCABI != llvm::AtomicOrderingCABI::consume &&
         OrderingCABI != llvm::AtomicOrderingCABI::acquire &&
         OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;

default:
  return true;
}
5119}

5121ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
                                       AtomicExpr::AtomicOp Op) {
CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
MultiExprArg Args{TheCall->getArgs(), TheCall->getNumArgs()};
return BuildAtomicExpr({TheCall->getBeginLoc(), TheCall->getEndLoc()},
                       DRE->getSourceRange(), TheCall->getRParenLoc(), Args,
                       Op);
5129}

5131ExprResult Sema::BuildAtomicExpr(SourceRange CallRange, SourceRange ExprRange,
                               SourceLocation RParenLoc, MultiExprArg Args,
                               AtomicExpr::AtomicOp Op,
                               AtomicArgumentOrder ArgOrder) {
// All the non-OpenCL operations take one of the following forms.
// The OpenCL operations take the __c11 forms with one extra argument for
// synchronization scope.
enum {
  // C    __c11_atomic_init(A *, C)
  Init,

  // C    __c11_atomic_load(A *, int)
  Load,

  // void __atomic_load(A *, CP, int)
  LoadCopy,

  // void __atomic_store(A *, CP, int)
  Copy,

  // C    __c11_atomic_add(A *, M, int)
  Arithmetic,

  // C    __atomic_exchange_n(A *, CP, int)
  Xchg,

  // void __atomic_exchange(A *, C *, CP, int)
  GNUXchg,

  // bool __c11_atomic_compare_exchange_strong(A *, C *, CP, int, int)
  C11CmpXchg,

  // bool __atomic_compare_exchange(A *, C *, CP, bool, int, int)
  GNUCmpXchg
} Form = Init;

const unsigned NumForm = GNUCmpXchg + 1;
const unsigned NumArgs[] = { 2, 2, 3, 3, 3, 3, 4, 5, 6 };
const unsigned NumVals[] = { 1, 0, 1, 1, 1, 1, 2, 2, 3 };
// where:
//   C is an appropriate type,
//   A is volatile _Atomic(C) for __c11 builtins and is C for GNU builtins,
//   CP is C for __c11 builtins and GNU _n builtins and is C * otherwise,
//   M is C if C is an integer, and ptrdiff_t if C is a pointer, and
//   the int parameters are for orderings.

static_assert(sizeof(NumArgs)/sizeof(NumArgs[0]) == NumForm
    && sizeof(NumVals)/sizeof(NumVals[0]) == NumForm,
    "need to update code for modified forms");
static_assert(AtomicExpr::AO__c11_atomic_init == 0 &&
                  AtomicExpr::AO__c11_atomic_fetch_min + 1 ==
                      AtomicExpr::AO__atomic_load,
              "need to update code for modified C11 atomics");
bool IsOpenCL = Op >= AtomicExpr::AO__opencl_atomic_init &&
                Op <= AtomicExpr::AO__opencl_atomic_fetch_max;
bool IsC11 = (Op >= AtomicExpr::AO__c11_atomic_init &&
             Op <= AtomicExpr::AO__c11_atomic_fetch_min) ||
             IsOpenCL;
bool IsN = Op == AtomicExpr::AO__atomic_load_n ||
           Op == AtomicExpr::AO__atomic_store_n ||
           Op == AtomicExpr::AO__atomic_exchange_n ||
           Op == AtomicExpr::AO__atomic_compare_exchange_n;
bool IsAddSub = false;

switch (Op) {
case AtomicExpr::AO__c11_atomic_init:
case AtomicExpr::AO__opencl_atomic_init:
  Form = Init;
  break;

case AtomicExpr::AO__c11_atomic_load:
case AtomicExpr::AO__opencl_atomic_load:
case AtomicExpr::AO__atomic_load_n:
  Form = Load;
  break;

case AtomicExpr::AO__atomic_load:
  Form = LoadCopy;
  break;

case AtomicExpr::AO__c11_atomic_store:
case AtomicExpr::AO__opencl_atomic_store:
case AtomicExpr::AO__atomic_store:
case AtomicExpr::AO__atomic_store_n:
  Form = Copy;
  break;

case AtomicExpr::AO__c11_atomic_fetch_add:
case AtomicExpr::AO__c11_atomic_fetch_sub:
case AtomicExpr::AO__opencl_atomic_fetch_add:
case AtomicExpr::AO__opencl_atomic_fetch_sub:
case AtomicExpr::AO__atomic_fetch_add:
case AtomicExpr::AO__atomic_fetch_sub:
case AtomicExpr::AO__atomic_add_fetch:
case AtomicExpr::AO__atomic_sub_fetch:
  IsAddSub = true;
  Form = Arithmetic;
  break;
case AtomicExpr::AO__c11_atomic_fetch_and:
case AtomicExpr::AO__c11_atomic_fetch_or:
case AtomicExpr::AO__c11_atomic_fetch_xor:
case AtomicExpr::AO__opencl_atomic_fetch_and:
case AtomicExpr::AO__opencl_atomic_fetch_or:
case AtomicExpr::AO__opencl_atomic_fetch_xor:
case AtomicExpr::AO__atomic_fetch_and:
case AtomicExpr::AO__atomic_fetch_or:
case AtomicExpr::AO__atomic_fetch_xor:
case AtomicExpr::AO__atomic_fetch_nand:
case AtomicExpr::AO__atomic_and_fetch:
case AtomicExpr::AO__atomic_or_fetch:
case AtomicExpr::AO__atomic_xor_fetch:
case AtomicExpr::AO__atomic_nand_fetch:
  Form = Arithmetic;
  break;
case AtomicExpr::AO__c11_atomic_fetch_min:
case AtomicExpr::AO__c11_atomic_fetch_max:
case AtomicExpr::AO__opencl_atomic_fetch_min:
case AtomicExpr::AO__opencl_atomic_fetch_max:
case AtomicExpr::AO__atomic_min_fetch:
case AtomicExpr::AO__atomic_max_fetch:
case AtomicExpr::AO__atomic_fetch_min:
case AtomicExpr::AO__atomic_fetch_max:
  Form = Arithmetic;
  break;

case AtomicExpr::AO__c11_atomic_exchange:
case AtomicExpr::AO__opencl_atomic_exchange:
case AtomicExpr::AO__atomic_exchange_n:
  Form = Xchg;
  break;

case AtomicExpr::AO__atomic_exchange:
  Form = GNUXchg;
  break;

case AtomicExpr::AO__c11_atomic_compare_exchange_strong:
case AtomicExpr::AO__c11_atomic_compare_exchange_weak:
case AtomicExpr::AO__opencl_atomic_compare_exchange_strong:
case AtomicExpr::AO__opencl_atomic_compare_exchange_weak:
  Form = C11CmpXchg;
  break;

case AtomicExpr::AO__atomic_compare_exchange:
case AtomicExpr::AO__atomic_compare_exchange_n:
  Form = GNUCmpXchg;
  break;
}

unsigned AdjustedNumArgs = NumArgs[Form];
if (IsOpenCL && Op != AtomicExpr::AO__opencl_atomic_init)
  ++AdjustedNumArgs;
// Check we have the right number of arguments.
if (Args.size() < AdjustedNumArgs) {
  Diag(CallRange.getEnd(), diag::err_typecheck_call_too_few_args)
      << 0 << AdjustedNumArgs << static_cast<unsigned>(Args.size())
      << ExprRange;
  return ExprError();
} else if (Args.size() > AdjustedNumArgs) {
  Diag(Args[AdjustedNumArgs]->getBeginLoc(),
       diag::err_typecheck_call_too_many_args)
      << 0 << AdjustedNumArgs << static_cast<unsigned>(Args.size())
      << ExprRange;
  return ExprError();
}

// Inspect the first argument of the atomic operation.
Expr *Ptr = Args[0];
ExprResult ConvertedPtr = DefaultFunctionArrayLvalueConversion(Ptr);
if (ConvertedPtr.isInvalid())
  return ExprError();

Ptr = ConvertedPtr.get();
const PointerType *pointerType = Ptr->getType()->getAs<PointerType>();
if (!pointerType) {
  Diag(ExprRange.getBegin(), diag::err_atomic_builtin_must_be_pointer)
      << Ptr->getType() << Ptr->getSourceRange();
  return ExprError();
}

// For a __c11 builtin, this should be a pointer to an _Atomic type.
QualType AtomTy = pointerType->getPointeeType(); // 'A'
QualType ValType = AtomTy; // 'C'
if (IsC11) {
  if (!AtomTy->isAtomicType()) {
    Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic)
        << Ptr->getType() << Ptr->getSourceRange();
    return ExprError();
  }
  if ((Form != Load && Form != LoadCopy && AtomTy.isConstQualified()) ||
      AtomTy.getAddressSpace() == LangAS::opencl_constant) {
    Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_non_const_atomic)
        << (AtomTy.isConstQualified() ? 0 : 1) << Ptr->getType()
        << Ptr->getSourceRange();
    return ExprError();
  }
  ValType = AtomTy->castAs<AtomicType>()->getValueType();
} else if (Form != Load && Form != LoadCopy) {
  if (ValType.isConstQualified()) {
    Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_non_const_pointer)
        << Ptr->getType() << Ptr->getSourceRange();
    return ExprError();
  }
}

// For an arithmetic operation, the implied arithmetic must be well-formed.
if (Form == Arithmetic) {
  // gcc does not enforce these rules for GNU atomics, but we do so for
  // sanity.
  auto IsAllowedValueType = [&](QualType ValType) {
    if (ValType->isIntegerType())
      return true;
    if (ValType->isPointerType())
      return true;
    if (!ValType->isFloatingType())
      return false;
    // LLVM Parser does not allow atomicrmw with x86_fp80 type.
    if (ValType->isSpecificBuiltinType(BuiltinType::LongDouble) &&
        &Context.getTargetInfo().getLongDoubleFormat() ==
            &llvm::APFloat::x87DoubleExtended())
      return false;
    return true;
  };
  if (IsAddSub && !IsAllowedValueType(ValType)) {
    Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int_ptr_or_fp)
        << IsC11 << Ptr->getType() << Ptr->getSourceRange();
    return ExprError();
  }
  if (!IsAddSub && !ValType->isIntegerType()) {
    Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int)
        << IsC11 << Ptr->getType() << Ptr->getSourceRange();
    return ExprError();
  }
  if (IsC11 && ValType->isPointerType() &&
      RequireCompleteType(Ptr->getBeginLoc(), ValType->getPointeeType(),
                          diag::err_incomplete_type)) {
    return ExprError();
  }
} else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType()) {
  // For __atomic_*_n operations, the value type must be a scalar integral or
  // pointer type which is 1, 2, 4, 8 or 16 bytes in length.
  Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int_or_ptr)
      << IsC11 << Ptr->getType() << Ptr->getSourceRange();
  return ExprError();
}

if (!IsC11 && !AtomTy.isTriviallyCopyableType(Context) &&
    !AtomTy->isScalarType()) {
  // For GNU atomics, require a trivially-copyable type. This is not part of
  // the GNU atomics specification, but we enforce it for sanity.
  Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_trivial_copy)
      << Ptr->getType() << Ptr->getSourceRange();
  return ExprError();
}

switch (ValType.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
  // okay
  break;

case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
  // FIXME: Can this happen? By this point, ValType should be known
  // to be trivially copyable.
  Diag(ExprRange.getBegin(), diag::err_arc_atomic_ownership)
      << ValType << Ptr->getSourceRange();
  return ExprError();
}

// All atomic operations have an overload which takes a pointer to a volatile
// 'A'.  We shouldn't let the volatile-ness of the pointee-type inject itself
// into the result or the other operands. Similarly atomic_load takes a
// pointer to a const 'A'.
ValType.removeLocalVolatile();
ValType.removeLocalConst();
QualType ResultType = ValType;
if (Form == Copy || Form == LoadCopy || Form == GNUXchg ||
    Form == Init)
  ResultType = Context.VoidTy;
else if (Form == C11CmpXchg || Form == GNUCmpXchg)
  ResultType = Context.BoolTy;

// The type of a parameter passed 'by value'. In the GNU atomics, such
// arguments are actually passed as pointers.
QualType ByValType = ValType; // 'CP'
bool IsPassedByAddress = false;
if (!IsC11 && !IsN) {
  ByValType = Ptr->getType();
  IsPassedByAddress = true;
}

SmallVector<Expr *, 5> APIOrderedArgs;
if (ArgOrder == Sema::AtomicArgumentOrder::AST) {
  APIOrderedArgs.push_back(Args[0]);
  switch (Form) {
  case Init:
  case Load:
    APIOrderedArgs.push_back(Args[1]); // Val1/Order
    break;
  case LoadCopy:
  case Copy:
  case Arithmetic:
  case Xchg:
    APIOrderedArgs.push_back(Args[2]); // Val1
    APIOrderedArgs.push_back(Args[1]); // Order
    break;
  case GNUXchg:
    APIOrderedArgs.push_back(Args[2]); // Val1
    APIOrderedArgs.push_back(Args[3]); // Val2
    APIOrderedArgs.push_back(Args[1]); // Order
    break;
  case C11CmpXchg:
    APIOrderedArgs.push_back(Args[2]); // Val1
    APIOrderedArgs.push_back(Args[4]); // Val2
    APIOrderedArgs.push_back(Args[1]); // Order
    APIOrderedArgs.push_back(Args[3]); // OrderFail
    break;
  case GNUCmpXchg:
    APIOrderedArgs.push_back(Args[2]); // Val1
    APIOrderedArgs.push_back(Args[4]); // Val2
    APIOrderedArgs.push_back(Args[5]); // Weak
    APIOrderedArgs.push_back(Args[1]); // Order
    APIOrderedArgs.push_back(Args[3]); // OrderFail
    break;
  }
} else
  APIOrderedArgs.append(Args.begin(), Args.end());

// The first argument's non-CV pointer type is used to deduce the type of
// subsequent arguments, except for:
//  - weak flag (always converted to bool)
//  - memory order (always converted to int)
//  - scope  (always converted to int)
for (unsigned i = 0; i != APIOrderedArgs.size(); ++i) {
  QualType Ty;
  if (i < NumVals[Form] + 1) {
    switch (i) {
    case 0:
      // The first argument is always a pointer. It has a fixed type.
      // It is always dereferenced, a nullptr is undefined.
      CheckNonNullArgument(*this, APIOrderedArgs[i], ExprRange.getBegin());
      // Nothing else to do: we already know all we want about this pointer.
      continue;
    case 1:
      // The second argument is the non-atomic operand. For arithmetic, this
      // is always passed by value, and for a compare_exchange it is always
      // passed by address. For the rest, GNU uses by-address and C11 uses
      // by-value.
      assert(Form != Load)((void)0);
      if (Form == Arithmetic && ValType->isPointerType())
        Ty = Context.getPointerDiffType();
      else if (Form == Init || Form == Arithmetic)
        Ty = ValType;
      else if (Form == Copy || Form == Xchg) {
        if (IsPassedByAddress) {
          // The value pointer is always dereferenced, a nullptr is undefined.
          CheckNonNullArgument(*this, APIOrderedArgs[i],
                               ExprRange.getBegin());
        }
        Ty = ByValType;
      } else {
        Expr *ValArg = APIOrderedArgs[i];
        // The value pointer is always dereferenced, a nullptr is undefined.
        CheckNonNullArgument(*this, ValArg, ExprRange.getBegin());
        LangAS AS = LangAS::Default;
        // Keep address space of non-atomic pointer type.
        if (const PointerType *PtrTy =
                ValArg->getType()->getAs<PointerType>()) {
          AS = PtrTy->getPointeeType().getAddressSpace();
        }
        Ty = Context.getPointerType(
            Context.getAddrSpaceQualType(ValType.getUnqualifiedType(), AS));
      }
      break;
    case 2:
      // The third argument to compare_exchange / GNU exchange is the desired
      // value, either by-value (for the C11 and *_n variant) or as a pointer.
      if (IsPassedByAddress)
        CheckNonNullArgument(*this, APIOrderedArgs[i], ExprRange.getBegin());
      Ty = ByValType;
      break;
    case 3:
      // The fourth argument to GNU compare_exchange is a 'weak' flag.
      Ty = Context.BoolTy;
      break;
    }
  } else {
    // The order(s) and scope are always converted to int.
    Ty = Context.IntTy;
  }

  InitializedEntity Entity =
      InitializedEntity::InitializeParameter(Context, Ty, false);
  ExprResult Arg = APIOrderedArgs[i];
  Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
  if (Arg.isInvalid())
    return true;
  APIOrderedArgs[i] = Arg.get();
}

// Permute the arguments into a 'consistent' order.
SmallVector<Expr*, 5> SubExprs;
SubExprs.push_back(Ptr);
switch (Form) {
case Init:
  // Note, AtomicExpr::getVal1() has a special case for this atomic.
  SubExprs.push_back(APIOrderedArgs[1]); // Val1
  break;
case Load:
  SubExprs.push_back(APIOrderedArgs[1]); // Order
  break;
case LoadCopy:
case Copy:
case Arithmetic:
case Xchg:
  SubExprs.push_back(APIOrderedArgs[2]); // Order
  SubExprs.push_back(APIOrderedArgs[1]); // Val1
  break;
case GNUXchg:
  // Note, AtomicExpr::getVal2() has a special case for this atomic.
  SubExprs.push_back(APIOrderedArgs[3]); // Order
  SubExprs.push_back(APIOrderedArgs[1]); // Val1
  SubExprs.push_back(APIOrderedArgs[2]); // Val2
  break;
case C11CmpXchg:
  SubExprs.push_back(APIOrderedArgs[3]); // Order
  SubExprs.push_back(APIOrderedArgs[1]); // Val1
  SubExprs.push_back(APIOrderedArgs[4]); // OrderFail
  SubExprs.push_back(APIOrderedArgs[2]); // Val2
  break;
case GNUCmpXchg:
  SubExprs.push_back(APIOrderedArgs[4]); // Order
  SubExprs.push_back(APIOrderedArgs[1]); // Val1
  SubExprs.push_back(APIOrderedArgs[5]); // OrderFail
  SubExprs.push_back(APIOrderedArgs[2]); // Val2
  SubExprs.push_back(APIOrderedArgs[3]); // Weak
  break;
}

if (SubExprs.size() >= 2 && Form != Init) {
  if (Optional<llvm::APSInt> Result =
          SubExprs[1]->getIntegerConstantExpr(Context))
    if (!isValidOrderingForOp(Result->getSExtValue(), Op))
      Diag(SubExprs[1]->getBeginLoc(),
           diag::warn_atomic_op_has_invalid_memory_order)
          << SubExprs[1]->getSourceRange();
}

if (auto ScopeModel = AtomicExpr::getScopeModel(Op)) {
  auto *Scope = Args[Args.size() - 1];
  if (Optional<llvm::APSInt> Result =
          Scope->getIntegerConstantExpr(Context)) {
    if (!ScopeModel->isValid(Result->getZExtValue()))
      Diag(Scope->getBeginLoc(), diag::err_atomic_op_has_invalid_synch_scope)
          << Scope->getSourceRange();
  }
  SubExprs.push_back(Scope);
}

AtomicExpr *AE = new (Context)
    AtomicExpr(ExprRange.getBegin(), SubExprs, ResultType, Op, RParenLoc);

if ((Op == AtomicExpr::AO__c11_atomic_load ||
     Op == AtomicExpr::AO__c11_atomic_store ||
     Op == AtomicExpr::AO__opencl_atomic_load ||
     Op == AtomicExpr::AO__opencl_atomic_store ) &&
    Context.AtomicUsesUnsupportedLibcall(AE))
  Diag(AE->getBeginLoc(), diag::err_atomic_load_store_uses_lib)
      << ((Op == AtomicExpr::AO__c11_atomic_load ||
           Op == AtomicExpr::AO__opencl_atomic_load)
              ? 0
              : 1);

if (ValType->isExtIntType()) {
  Diag(Ptr->getExprLoc(), diag::err_atomic_builtin_ext_int_prohibit);
  return ExprError();
}

return AE;
5611}

5613/// checkBuiltinArgument - Given a call to a builtin function, perform
5614/// normal type-checking on the given argument, updating the call in
5615/// place.  This is useful when a builtin function requires custom
5616/// type-checking for some of its arguments but not necessarily all of
5617/// them.
5618///
5619/// Returns true on error.
5620static bool checkBuiltinArgument(Sema &S, CallExpr *E, unsigned ArgIndex) {
FunctionDecl *Fn = E->getDirectCallee();
assert(Fn && "builtin call without direct callee!")((void)0);

ParmVarDecl *Param = Fn->getParamDecl(ArgIndex);
InitializedEntity Entity =
  InitializedEntity::InitializeParameter(S.Context, Param);

ExprResult Arg = E->getArg(0);
Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (Arg.isInvalid())
  return true;

E->setArg(ArgIndex, Arg.get());
return false;
5635}

5637/// We have a call to a function like __sync_fetch_and_add, which is an
5638/// overloaded function based on the pointer type of its first argument.
5639/// The main BuildCallExpr routines have already promoted the types of
5640/// arguments because all of these calls are prototyped as void(...).
5641///
5642/// This function goes through and does final semantic checking for these
5643/// builtins, as well as generating any warnings.
5644ExprResult
5645Sema::SemaBuiltinAtomicOverloaded(ExprResult TheCallResult) {
CallExpr *TheCall = static_cast<CallExpr *>(TheCallResult.get());
Expr *Callee = TheCall->getCallee();
DeclRefExpr *DRE = cast<DeclRefExpr>(Callee->IgnoreParenCasts());
FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());

// Ensure that we have at least one argument to do type inference from.
if (TheCall->getNumArgs() < 1) {
  Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
      << 0 << 1 << TheCall->getNumArgs() << Callee->getSourceRange();
  return ExprError();
}

// Inspect the first argument of the atomic builtin.  This should always be
// a pointer type, whose element is an integral scalar or pointer type.
// Because it is a pointer type, we don't have to worry about any implicit
// casts here.
// FIXME: We don't allow floating point scalars as input.
Expr *FirstArg = TheCall->getArg(0);
ExprResult FirstArgResult = DefaultFunctionArrayLvalueConversion(FirstArg);
if (FirstArgResult.isInvalid())
  return ExprError();
FirstArg = FirstArgResult.get();
TheCall->setArg(0, FirstArg);

const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>();
if (!pointerType) {
  Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
      << FirstArg->getType() << FirstArg->getSourceRange();
  return ExprError();
}

QualType ValType = pointerType->getPointeeType();
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
    !ValType->isBlockPointerType()) {
  Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intptr)
      << FirstArg->getType() << FirstArg->getSourceRange();
  return ExprError();
}

if (ValType.isConstQualified()) {
  Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_cannot_be_const)
      << FirstArg->getType() << FirstArg->getSourceRange();
  return ExprError();
}

switch (ValType.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
  // okay
  break;

case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
  Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
      << ValType << FirstArg->getSourceRange();
  return ExprError();
}

// Strip any qualifiers off ValType.
ValType = ValType.getUnqualifiedType();

// The majority of builtins return a value, but a few have special return
// types, so allow them to override appropriately below.
QualType ResultType = ValType;

// We need to figure out which concrete builtin this maps onto.  For example,
// __sync_fetch_and_add with a 2 byte object turns into
// __sync_fetch_and_add_2.
5715#define BUILTIN_ROW(x) \
{ Builtin::BI##x##_1, Builtin::BI##x##_2, Builtin::BI##x##_4, \
  Builtin::BI##x##_8, Builtin::BI##x##_16 }

static const unsigned BuiltinIndices[][5] = {
  BUILTIN_ROW(__sync_fetch_and_add),
  BUILTIN_ROW(__sync_fetch_and_sub),
  BUILTIN_ROW(__sync_fetch_and_or),
  BUILTIN_ROW(__sync_fetch_and_and),
  BUILTIN_ROW(__sync_fetch_and_xor),
  BUILTIN_ROW(__sync_fetch_and_nand),

  BUILTIN_ROW(__sync_add_and_fetch),
  BUILTIN_ROW(__sync_sub_and_fetch),
  BUILTIN_ROW(__sync_and_and_fetch),
  BUILTIN_ROW(__sync_or_and_fetch),
  BUILTIN_ROW(__sync_xor_and_fetch),
  BUILTIN_ROW(__sync_nand_and_fetch),

  BUILTIN_ROW(__sync_val_compare_and_swap),
  BUILTIN_ROW(__sync_bool_compare_and_swap),
  BUILTIN_ROW(__sync_lock_test_and_set),
  BUILTIN_ROW(__sync_lock_release),
  BUILTIN_ROW(__sync_swap)
};
5740#undef BUILTIN_ROW

// Determine the index of the size.
unsigned SizeIndex;
switch (Context.getTypeSizeInChars(ValType).getQuantity()) {
case 1: SizeIndex = 0; break;
case 2: SizeIndex = 1; break;
case 4: SizeIndex = 2; break;
case 8: SizeIndex = 3; break;
case 16: SizeIndex = 4; break;
default:
  Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_pointer_size)
      << FirstArg->getType() << FirstArg->getSourceRange();
  return ExprError();
}

// Each of these builtins has one pointer argument, followed by some number of
// values (0, 1 or 2) followed by a potentially empty varags list of stuff
// that we ignore.  Find out which row of BuiltinIndices to read from as well
// as the number of fixed args.
unsigned BuiltinID = FDecl->getBuiltinID();
unsigned BuiltinIndex, NumFixed = 1;
bool WarnAboutSemanticsChange = false;
switch (BuiltinID) {
default: llvm_unreachable("Unknown overloaded atomic builtin!")__builtin_unreachable();
case Builtin::BI__sync_fetch_and_add:
case Builtin::BI__sync_fetch_and_add_1:
case Builtin::BI__sync_fetch_and_add_2:
case Builtin::BI__sync_fetch_and_add_4:
case Builtin::BI__sync_fetch_and_add_8:
case Builtin::BI__sync_fetch_and_add_16:
  BuiltinIndex = 0;
  break;

case Builtin::BI__sync_fetch_and_sub:
case Builtin::BI__sync_fetch_and_sub_1:
case Builtin::BI__sync_fetch_and_sub_2:
case Builtin::BI__sync_fetch_and_sub_4:
case Builtin::BI__sync_fetch_and_sub_8:
case Builtin::BI__sync_fetch_and_sub_16:
  BuiltinIndex = 1;
  break;

case Builtin::BI__sync_fetch_and_or:
case Builtin::BI__sync_fetch_and_or_1:
case Builtin::BI__sync_fetch_and_or_2:
case Builtin::BI__sync_fetch_and_or_4:
case Builtin::BI__sync_fetch_and_or_8:
case Builtin::BI__sync_fetch_and_or_16:
  BuiltinIndex = 2;
  break;

case Builtin::BI__sync_fetch_and_and:
case Builtin::BI__sync_fetch_and_and_1:
case Builtin::BI__sync_fetch_and_and_2:
case Builtin::BI__sync_fetch_and_and_4:
case Builtin::BI__sync_fetch_and_and_8:
case Builtin::BI__sync_fetch_and_and_16:
  BuiltinIndex = 3;
  break;

case Builtin::BI__sync_fetch_and_xor:
case Builtin::BI__sync_fetch_and_xor_1:
case Builtin::BI__sync_fetch_and_xor_2:
case Builtin::BI__sync_fetch_and_xor_4:
case Builtin::BI__sync_fetch_and_xor_8:
case Builtin::BI__sync_fetch_and_xor_16:
  BuiltinIndex = 4;
  break;

case Builtin::BI__sync_fetch_and_nand:
case Builtin::BI__sync_fetch_and_nand_1:
case Builtin::BI__sync_fetch_and_nand_2:
case Builtin::BI__sync_fetch_and_nand_4:
case Builtin::BI__sync_fetch_and_nand_8:
case Builtin::BI__sync_fetch_and_nand_16:
  BuiltinIndex = 5;
  WarnAboutSemanticsChange = true;
  break;

case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_add_and_fetch_1:
case Builtin::BI__sync_add_and_fetch_2:
case Builtin::BI__sync_add_and_fetch_4:
case Builtin::BI__sync_add_and_fetch_8:
case Builtin::BI__sync_add_and_fetch_16:
  BuiltinIndex = 6;
  break;

case Builtin::BI__sync_sub_and_fetch:
case Builtin::BI__sync_sub_and_fetch_1:
case Builtin::BI__sync_sub_and_fetch_2:
case Builtin::BI__sync_sub_and_fetch_4:
case Builtin::BI__sync_sub_and_fetch_8:
case Builtin::BI__sync_sub_and_fetch_16:
  BuiltinIndex = 7;
  break;

case Builtin::BI__sync_and_and_fetch:
case Builtin::BI__sync_and_and_fetch_1:
case Builtin::BI__sync_and_and_fetch_2:
case Builtin::BI__sync_and_and_fetch_4:
case Builtin::BI__sync_and_and_fetch_8:
case Builtin::BI__sync_and_and_fetch_16:
  BuiltinIndex = 8;
  break;

case Builtin::BI__sync_or_and_fetch:
case Builtin::BI__sync_or_and_fetch_1:
case Builtin::BI__sync_or_and_fetch_2:
case Builtin::BI__sync_or_and_fetch_4:
case Builtin::BI__sync_or_and_fetch_8:
case Builtin::BI__sync_or_and_fetch_16:
  BuiltinIndex = 9;
  break;

case Builtin::BI__sync_xor_and_fetch:
case Builtin::BI__sync_xor_and_fetch_1:
case Builtin::BI__sync_xor_and_fetch_2:
case Builtin::BI__sync_xor_and_fetch_4:
case Builtin::BI__sync_xor_and_fetch_8:
case Builtin::BI__sync_xor_and_fetch_16:
  BuiltinIndex = 10;
  break;

case Builtin::BI__sync_nand_and_fetch:
case Builtin::BI__sync_nand_and_fetch_1:
case Builtin::BI__sync_nand_and_fetch_2:
case Builtin::BI__sync_nand_and_fetch_4:
case Builtin::BI__sync_nand_and_fetch_8:
case Builtin::BI__sync_nand_and_fetch_16:
  BuiltinIndex = 11;
  WarnAboutSemanticsChange = true;
  break;

case Builtin::BI__sync_val_compare_and_swap:
case Builtin::BI__sync_val_compare_and_swap_1:
case Builtin::BI__sync_val_compare_and_swap_2:
case Builtin::BI__sync_val_compare_and_swap_4:
case Builtin::BI__sync_val_compare_and_swap_8:
case Builtin::BI__sync_val_compare_and_swap_16:
  BuiltinIndex = 12;
  NumFixed = 2;
  break;

case Builtin::BI__sync_bool_compare_and_swap:
case Builtin::BI__sync_bool_compare_and_swap_1:
case Builtin::BI__sync_bool_compare_and_swap_2:
case Builtin::BI__sync_bool_compare_and_swap_4:
case Builtin::BI__sync_bool_compare_and_swap_8:
case Builtin::BI__sync_bool_compare_and_swap_16:
  BuiltinIndex = 13;
  NumFixed = 2;
  ResultType = Context.BoolTy;
  break;

case Builtin::BI__sync_lock_test_and_set:
case Builtin::BI__sync_lock_test_and_set_1:
case Builtin::BI__sync_lock_test_and_set_2:
case Builtin::BI__sync_lock_test_and_set_4:
case Builtin::BI__sync_lock_test_and_set_8:
case Builtin::BI__sync_lock_test_and_set_16:
  BuiltinIndex = 14;
  break;

case Builtin::BI__sync_lock_release:
case Builtin::BI__sync_lock_release_1:
case Builtin::BI__sync_lock_release_2:
case Builtin::BI__sync_lock_release_4:
case Builtin::BI__sync_lock_release_8:
case Builtin::BI__sync_lock_release_16:
  BuiltinIndex = 15;
  NumFixed = 0;
  ResultType = Context.VoidTy;
  break;

case Builtin::BI__sync_swap:
case Builtin::BI__sync_swap_1:
case Builtin::BI__sync_swap_2:
case Builtin::BI__sync_swap_4:
case Builtin::BI__sync_swap_8:
case Builtin::BI__sync_swap_16:
  BuiltinIndex = 16;
  break;
}

// Now that we know how many fixed arguments we expect, first check that we
// have at least that many.
if (TheCall->getNumArgs() < 1+NumFixed) {
  Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
      << 0 << 1 + NumFixed << TheCall->getNumArgs()
      << Callee->getSourceRange();
  return ExprError();
}

Diag(TheCall->getEndLoc(), diag::warn_atomic_implicit_seq_cst)
    << Callee->getSourceRange();

if (WarnAboutSemanticsChange) {
  Diag(TheCall->getEndLoc(), diag::warn_sync_fetch_and_nand_semantics_change)
      << Callee->getSourceRange();
}

// Get the decl for the concrete builtin from this, we can tell what the
// concrete integer type we should convert to is.
unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex];
const char *NewBuiltinName = Context.BuiltinInfo.getName(NewBuiltinID);
FunctionDecl *NewBuiltinDecl;
if (NewBuiltinID == BuiltinID)
  NewBuiltinDecl = FDecl;
else {
  // Perform builtin lookup to avoid redeclaring it.
  DeclarationName DN(&Context.Idents.get(NewBuiltinName));
  LookupResult Res(*this, DN, DRE->getBeginLoc(), LookupOrdinaryName);
  LookupName(Res, TUScope, /*AllowBuiltinCreation=*/true);
  assert(Res.getFoundDecl())((void)0);
  NewBuiltinDecl = dyn_cast<FunctionDecl>(Res.getFoundDecl());
  if (!NewBuiltinDecl)
    return ExprError();
}

// The first argument --- the pointer --- has a fixed type; we
// deduce the types of the rest of the arguments accordingly.  Walk
// the remaining arguments, converting them to the deduced value type.
for (unsigned i = 0; i != NumFixed; ++i) {
  ExprResult Arg = TheCall->getArg(i+1);

  // GCC does an implicit conversion to the pointer or integer ValType.  This
  // can fail in some cases (1i -> int**), check for this error case now.
  // Initialize the argument.
  InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
                                                 ValType, /*consume*/ false);
  Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
  if (Arg.isInvalid())
    return ExprError();

  // Okay, we have something that *can* be converted to the right type.  Check
  // to see if there is a potentially weird extension going on here.  This can
  // happen when you do an atomic operation on something like an char* and
  // pass in 42.  The 42 gets converted to char.  This is even more strange
  // for things like 45.123 -> char, etc.
  // FIXME: Do this check.
  TheCall->setArg(i+1, Arg.get());
}

// Create a new DeclRefExpr to refer to the new decl.
DeclRefExpr *NewDRE = DeclRefExpr::Create(
    Context, DRE->getQualifierLoc(), SourceLocation(), NewBuiltinDecl,
    /*enclosing*/ false, DRE->getLocation(), Context.BuiltinFnTy,
    DRE->getValueKind(), nullptr, nullptr, DRE->isNonOdrUse());

// Set the callee in the CallExpr.
// FIXME: This loses syntactic information.
QualType CalleePtrTy = Context.getPointerType(NewBuiltinDecl->getType());
ExprResult PromotedCall = ImpCastExprToType(NewDRE, CalleePtrTy,
                                            CK_BuiltinFnToFnPtr);
TheCall->setCallee(PromotedCall.get());

// Change the result type of the call to match the original value type. This
// is arbitrary, but the codegen for these builtins ins design to handle it
// gracefully.
TheCall->setType(ResultType);

// Prohibit use of _ExtInt with atomic builtins.
// The arguments would have already been converted to the first argument's
// type, so only need to check the first argument.
const auto *ExtIntValType = ValType->getAs<ExtIntType>();
if (ExtIntValType && !llvm::isPowerOf2_64(ExtIntValType->getNumBits())) {
  Diag(FirstArg->getExprLoc(), diag::err_atomic_builtin_ext_int_size);
  return ExprError();
}

return TheCallResult;
6013}

6015/// SemaBuiltinNontemporalOverloaded - We have a call to
6016/// __builtin_nontemporal_store or __builtin_nontemporal_load, which is an
6017/// overloaded function based on the pointer type of its last argument.
6018///
6019/// This function goes through and does final semantic checking for these
6020/// builtins.
6021ExprResult Sema::SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult) {
CallExpr *TheCall = (CallExpr *)TheCallResult.get();
DeclRefExpr *DRE =
    cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
unsigned BuiltinID = FDecl->getBuiltinID();
assert((BuiltinID == Builtin::BI__builtin_nontemporal_store ||((void)0)
        BuiltinID == Builtin::BI__builtin_nontemporal_load) &&((void)0)
       "Unexpected nontemporal load/store builtin!")((void)0);
bool isStore = BuiltinID == Builtin::BI__builtin_nontemporal_store;
unsigned numArgs = isStore ? 2 : 1;

// Ensure that we have the proper number of arguments.
if (checkArgCount(*this, TheCall, numArgs))
  return ExprError();

// Inspect the last argument of the nontemporal builtin.  This should always
// be a pointer type, from which we imply the type of the memory access.
// Because it is a pointer type, we don't have to worry about any implicit
// casts here.
Expr *PointerArg = TheCall->getArg(numArgs - 1);
ExprResult PointerArgResult =
    DefaultFunctionArrayLvalueConversion(PointerArg);

if (PointerArgResult.isInvalid())
  return ExprError();
PointerArg = PointerArgResult.get();
TheCall->setArg(numArgs - 1, PointerArg);

const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
if (!pointerType) {
  Diag(DRE->getBeginLoc(), diag::err_nontemporal_builtin_must_be_pointer)
      << PointerArg->getType() << PointerArg->getSourceRange();
  return ExprError();
}

QualType ValType = pointerType->getPointeeType();

// Strip any qualifiers off ValType.
ValType = ValType.getUnqualifiedType();
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
    !ValType->isBlockPointerType() && !ValType->isFloatingType() &&
    !ValType->isVectorType()) {
  Diag(DRE->getBeginLoc(),
       diag::err_nontemporal_builtin_must_be_pointer_intfltptr_or_vector)
      << PointerArg->getType() << PointerArg->getSourceRange();
  return ExprError();
}

if (!isStore) {
  TheCall->setType(ValType);
  return TheCallResult;
}

ExprResult ValArg = TheCall->getArg(0);
InitializedEntity Entity = InitializedEntity::InitializeParameter(
    Context, ValType, /*consume*/ false);
ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
if (ValArg.isInvalid())
  return ExprError();

TheCall->setArg(0, ValArg.get());
TheCall->setType(Context.VoidTy);
return TheCallResult;
6085}

6087/// CheckObjCString - Checks that the argument to the builtin
6088/// CFString constructor is correct
6089/// Note: It might also make sense to do the UTF-16 conversion here (would
6090/// simplify the backend).
6091bool Sema::CheckObjCString(Expr *Arg) {
Arg = Arg->IgnoreParenCasts();
StringLiteral *Literal = dyn_cast<StringLiteral>(Arg);

if (!Literal || !Literal->isAscii()) {
  Diag(Arg->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
      << Arg->getSourceRange();
  return true;
}

if (Literal->containsNonAsciiOrNull()) {
  StringRef String = Literal->getString();
  unsigned NumBytes = String.size();
  SmallVector<llvm::UTF16, 128> ToBuf(NumBytes);
  const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
  llvm::UTF16 *ToPtr = &ToBuf[0];

  llvm::ConversionResult Result =
      llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
                               ToPtr + NumBytes, llvm::strictConversion);
  // Check for conversion failure.
  if (Result != llvm::conversionOK)
    Diag(Arg->getBeginLoc(), diag::warn_cfstring_truncated)
        << Arg->getSourceRange();
}
return false;
6117}

6119/// CheckObjCString - Checks that the format string argument to the os_log()
6120/// and os_trace() functions is correct, and converts it to const char *.
6121ExprResult Sema::CheckOSLogFormatStringArg(Expr *Arg) {
Arg = Arg->IgnoreParenCasts();
auto *Literal = dyn_cast<StringLiteral>(Arg);
if (!Literal) {
  if (auto *ObjcLiteral = dyn_cast<ObjCStringLiteral>(Arg)) {
    Literal = ObjcLiteral->getString();
  }
}

if (!Literal || (!Literal->isAscii() && !Literal->isUTF8())) {
  return ExprError(
      Diag(Arg->getBeginLoc(), diag::err_os_log_format_not_string_constant)
      << Arg->getSourceRange());
}

ExprResult Result(Literal);
QualType ResultTy = Context.getPointerType(Context.CharTy.withConst());
InitializedEntity Entity =
    InitializedEntity::InitializeParameter(Context, ResultTy, false);
Result = PerformCopyInitialization(Entity, SourceLocation(), Result);
return Result;
6142}

6144/// Check that the user is calling the appropriate va_start builtin for the
6145/// target and calling convention.
6146static bool checkVAStartABI(Sema &S, unsigned BuiltinID, Expr *Fn) {
const llvm::Triple &TT = S.Context.getTargetInfo().getTriple();
bool IsX64 = TT.getArch() == llvm::Triple::x86_64;
bool IsAArch64 = (TT.getArch() == llvm::Triple::aarch64 ||
                  TT.getArch() == llvm::Triple::aarch64_32);
bool IsWindows = TT.isOSWindows();
bool IsMSVAStart = BuiltinID == Builtin::BI__builtin_ms_va_start;
if (IsX64 || IsAArch64) {
  CallingConv CC = CC_C;
  if (const FunctionDecl *FD = S.getCurFunctionDecl())
    CC = FD->getType()->castAs<FunctionType>()->getCallConv();
  if (IsMSVAStart) {
    // Don't allow this in System V ABI functions.
    if (CC == CC_X86_64SysV || (!IsWindows && CC != CC_Win64))
      return S.Diag(Fn->getBeginLoc(),
                    diag::err_ms_va_start_used_in_sysv_function);
  } else {
    // On x86-64/AArch64 Unix, don't allow this in Win64 ABI functions.
    // On x64 Windows, don't allow this in System V ABI functions.
    // (Yes, that means there's no corresponding way to support variadic
    // System V ABI functions on Windows.)
    if ((IsWindows && CC == CC_X86_64SysV) ||
        (!IsWindows && CC == CC_Win64))
      return S.Diag(Fn->getBeginLoc(),
                    diag::err_va_start_used_in_wrong_abi_function)
             << !IsWindows;
  }
  return false;
}

if (IsMSVAStart)
  return S.Diag(Fn->getBeginLoc(), diag::err_builtin_x64_aarch64_only);
return false;
6179}

6181static bool checkVAStartIsInVariadicFunction(Sema &S, Expr *Fn,
                                           ParmVarDecl **LastParam = nullptr) {
// Determine whether the current function, block, or obj-c method is variadic
// and get its parameter list.
bool IsVariadic = false;
ArrayRef<ParmVarDecl *> Params;
DeclContext *Caller = S.CurContext;
if (auto *Block = dyn_cast<BlockDecl>(Caller)) {
  IsVariadic = Block->isVariadic();
  Params = Block->parameters();
} else if (auto *FD = dyn_cast<FunctionDecl>(Caller)) {
  IsVariadic = FD->isVariadic();
  Params = FD->parameters();
} else if (auto *MD = dyn_cast<ObjCMethodDecl>(Caller)) {
  IsVariadic = MD->isVariadic();
  // FIXME: This isn't correct for methods (results in bogus warning).
  Params = MD->parameters();
} else if (isa<CapturedDecl>(Caller)) {
  // We don't support va_start in a CapturedDecl.
  S.Diag(Fn->getBeginLoc(), diag::err_va_start_captured_stmt);
  return true;
} else {
  // This must be some other declcontext that parses exprs.
  S.Diag(Fn->getBeginLoc(), diag::err_va_start_outside_function);
  return true;
}

if (!IsVariadic) {
  S.Diag(Fn->getBeginLoc(), diag::err_va_start_fixed_function);
  return true;
}

if (LastParam)
  *LastParam = Params.empty() ? nullptr : Params.back();

return false;
6217}

6219/// Check the arguments to '__builtin_va_start' or '__builtin_ms_va_start'
6220/// for validity.  Emit an error and return true on failure; return false
6221/// on success.
6222bool Sema::SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall) {
Expr *Fn = TheCall->getCallee();

if (checkVAStartABI(*this, BuiltinID, Fn))
  return true;

if (checkArgCount(*this, TheCall, 2))
  return true;

// Type-check the first argument normally.
if (checkBuiltinArgument(*this, TheCall, 0))
  return true;

// Check that the current function is variadic, and get its last parameter.
ParmVarDecl *LastParam;
if (checkVAStartIsInVariadicFunction(*this, Fn, &LastParam))
  return true;

// Verify that the second argument to the builtin is the last argument of the
// current function or method.
bool SecondArgIsLastNamedArgument = false;
const Expr *Arg = TheCall->getArg(1)->IgnoreParenCasts();

// These are valid if SecondArgIsLastNamedArgument is false after the next
// block.
QualType Type;
SourceLocation ParamLoc;
bool IsCRegister = false;

if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Arg)) {
  if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(DR->getDecl())) {
    SecondArgIsLastNamedArgument = PV == LastParam;

    Type = PV->getType();
    ParamLoc = PV->getLocation();
    IsCRegister =
        PV->getStorageClass() == SC_Register && !getLangOpts().CPlusPlus;
  }
}

if (!SecondArgIsLastNamedArgument)
  Diag(TheCall->getArg(1)->getBeginLoc(),
       diag::warn_second_arg_of_va_start_not_last_named_param);
else if (IsCRegister || Type->isReferenceType() ||
         Type->isSpecificBuiltinType(BuiltinType::Float) || [=] {
           // Promotable integers are UB, but enumerations need a bit of
           // extra checking to see what their promotable type actually is.
           if (!Type->isPromotableIntegerType())
             return false;
           if (!Type->isEnumeralType())
             return true;
           const EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
           return !(ED &&
                    Context.typesAreCompatible(ED->getPromotionType(), Type));
         }()) {
  unsigned Reason = 0;
  if (Type->isReferenceType())  Reason = 1;
  else if (IsCRegister)         Reason = 2;
  Diag(Arg->getBeginLoc(), diag::warn_va_start_type_is_undefined) << Reason;
  Diag(ParamLoc, diag::note_parameter_type) << Type;
}

TheCall->setType(Context.VoidTy);
return false;
6286}

6288bool Sema::SemaBuiltinVAStartARMMicrosoft(CallExpr *Call) {
// void __va_start(va_list *ap, const char *named_addr, size_t slot_size,
//                 const char *named_addr);

Expr *Func = Call->getCallee();

if (Call->getNumArgs() < 3)
  return Diag(Call->getEndLoc(),
              diag::err_typecheck_call_too_few_args_at_least)
         << 0 /*function call*/ << 3 << Call->getNumArgs();

// Type-check the first argument normally.
if (checkBuiltinArgument(*this, Call, 0))
  return true;

// Check that the current function is variadic.
if (checkVAStartIsInVariadicFunction(*this, Func))
  return true;

// __va_start on Windows does not validate the parameter qualifiers

const Expr *Arg1 = Call->getArg(1)->IgnoreParens();
const Type *Arg1Ty = Arg1->getType().getCanonicalType().getTypePtr();

const Expr *Arg2 = Call->getArg(2)->IgnoreParens();
const Type *Arg2Ty = Arg2->getType().getCanonicalType().getTypePtr();

const QualType &ConstCharPtrTy =
    Context.getPointerType(Context.CharTy.withConst());
if (!Arg1Ty->isPointerType() ||
    Arg1Ty->getPointeeType().withoutLocalFastQualifiers() != Context.CharTy)
  Diag(Arg1->getBeginLoc(), diag::err_typecheck_convert_incompatible)
      << Arg1->getType() << ConstCharPtrTy << 1 /* different class */
      << 0                                      /* qualifier difference */
      << 3                                      /* parameter mismatch */
      << 2 << Arg1->getType() << ConstCharPtrTy;

const QualType SizeTy = Context.getSizeType();
if (Arg2Ty->getCanonicalTypeInternal().withoutLocalFastQualifiers() != SizeTy)
  Diag(Arg2->getBeginLoc(), diag::err_typecheck_convert_incompatible)
      << Arg2->getType() << SizeTy << 1 /* different class */
      << 0                              /* qualifier difference */
      << 3                              /* parameter mismatch */
      << 3 << Arg2->getType() << SizeTy;

return false;
6334}

6336/// SemaBuiltinUnorderedCompare - Handle functions like __builtin_isgreater and
6337/// friends.  This is declared to take (...), so we have to check everything.
6338bool Sema::SemaBuiltinUnorderedCompare(CallExpr *TheCall) {
if (checkArgCount(*this, TheCall, 2))
  return true;

ExprResult OrigArg0 = TheCall->getArg(0);
ExprResult OrigArg1 = TheCall->getArg(1);

// Do standard promotions between the two arguments, returning their common
// type.
QualType Res = UsualArithmeticConversions(
    OrigArg0, OrigArg1, TheCall->getExprLoc(), ACK_Comparison);
if (OrigArg0.isInvalid() || OrigArg1.isInvalid())
  return true;

// Make sure any conversions are pushed back into the call; this is
// type safe since unordered compare builtins are declared as "_Bool
// foo(...)".
TheCall->setArg(0, OrigArg0.get());
TheCall->setArg(1, OrigArg1.get());

if (OrigArg0.get()->isTypeDependent() || OrigArg1.get()->isTypeDependent())
  return false;

// If the common type isn't a real floating type, then the arguments were
// invalid for this operation.
if (Res.isNull() || !Res->isRealFloatingType())
  return Diag(OrigArg0.get()->getBeginLoc(),
              diag::err_typecheck_call_invalid_ordered_compare)
         << OrigArg0.get()->getType() << OrigArg1.get()->getType()
         << SourceRange(OrigArg0.get()->getBeginLoc(),
                        OrigArg1.get()->getEndLoc());

return false;
6371}

6373/// SemaBuiltinSemaBuiltinFPClassification - Handle functions like
6374/// __builtin_isnan and friends.  This is declared to take (...), so we have
6375/// to check everything. We expect the last argument to be a floating point
6376/// value.
6377bool Sema::SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs) {
if (checkArgCount(*this, TheCall, NumArgs))
  return true;

// __builtin_fpclassify is the only case where NumArgs != 1, so we can count
// on all preceding parameters just being int.  Try all of those.
for (unsigned i = 0; i < NumArgs - 1; ++i) {
  Expr *Arg = TheCall->getArg(i);

  if (Arg->isTypeDependent())
    return false;

  ExprResult Res = PerformImplicitConversion(Arg, Context.IntTy, AA_Passing);

  if (Res.isInvalid())
    return true;
  TheCall->setArg(i, Res.get());
}

Expr *OrigArg = TheCall->getArg(NumArgs-1);

if (OrigArg->isTypeDependent())
  return false;

// Usual Unary Conversions will convert half to float, which we want for
// machines that use fp16 conversion intrinsics. Else, we wnat to leave the
// type how it is, but do normal L->Rvalue conversions.
if (Context.getTargetInfo().useFP16ConversionIntrinsics())
  OrigArg = UsualUnaryConversions(OrigArg).get();
else
  OrigArg = DefaultFunctionArrayLvalueConversion(OrigArg).get();
TheCall->setArg(NumArgs - 1, OrigArg);

// This operation requires a non-_Complex floating-point number.
if (!OrigArg->getType()->isRealFloatingType())
  return Diag(OrigArg->getBeginLoc(),
              diag::err_typecheck_call_invalid_unary_fp)
         << OrigArg->getType() << OrigArg->getSourceRange();

return false;
6417}

6419/// Perform semantic analysis for a call to __builtin_complex.
6420bool Sema::SemaBuiltinComplex(CallExpr *TheCall) {
if (checkArgCount(*this, TheCall, 2))
  return true;

bool Dependent = false;
for (unsigned I = 0; I != 2; ++I) {
  Expr *Arg = TheCall->getArg(I);
  QualType T = Arg->getType();
  if (T->isDependentType()) {
    Dependent = true;
    continue;
  }

  // Despite supporting _Complex int, GCC requires a real floating point type
  // for the operands of __builtin_complex.
  if (!T->isRealFloatingType()) {
    return Diag(Arg->getBeginLoc(), diag::err_typecheck_call_requires_real_fp)
           << Arg->getType() << Arg->getSourceRange();
  }

  ExprResult Converted = DefaultLvalueConversion(Arg);
  if (Converted.isInvalid())
    return true;
  TheCall->setArg(I, Converted.get());
}

if (Dependent) {
  TheCall->setType(Context.DependentTy);
  return false;
}

Expr *Real = TheCall->getArg(0);
Expr *Imag = TheCall->getArg(1);
if (!Context.hasSameType(Real->getType(), Imag->getType())) {
  return Diag(Real->getBeginLoc(),
              diag::err_typecheck_call_different_arg_types)
         << Real->getType() << Imag->getType()
         << Real->getSourceRange() << Imag->getSourceRange();
}

// We don't allow _Complex _Float16 nor _Complex __fp16 as type specifiers;
// don't allow this builtin to form those types either.
// FIXME: Should we allow these types?
if (Real->getType()->isFloat16Type())
  return Diag(TheCall->getBeginLoc(), diag::err_invalid_complex_spec)
         << "_Float16";
if (Real->getType()->isHalfType())
  return Diag(TheCall->getBeginLoc(), diag::err_invalid_complex_spec)
         << "half";

TheCall->setType(Context.getComplexType(Real->getType()));
return false;
6472}

6474// Customized Sema Checking for VSX builtins that have the following signature:
6475// vector [...] builtinName(vector [...], vector [...], const int);
6476// Which takes the same type of vectors (any legal vector type) for the first
6477// two arguments and takes compile time constant for the third argument.
6478// Example builtins are :
6479// vector double vec_xxpermdi(vector double, vector double, int);
6480// vector short vec_xxsldwi(vector short, vector short, int);
6481bool Sema::SemaBuiltinVSX(CallExpr *TheCall) {
unsigned ExpectedNumArgs = 3;
if (checkArgCount(*this, TheCall, ExpectedNumArgs))
  return true;

// Check the third argument is a compile time constant
if (!TheCall->getArg(2)->isIntegerConstantExpr(Context))
  return Diag(TheCall->getBeginLoc(),
              diag::err_vsx_builtin_nonconstant_argument)
         << 3 /* argument index */ << TheCall->getDirectCallee()
         << SourceRange(TheCall->getArg(2)->getBeginLoc(),
                        TheCall->getArg(2)->getEndLoc());

QualType Arg1Ty = TheCall->getArg(0)->getType();
QualType Arg2Ty = TheCall->getArg(1)->getType();

// Check the type of argument 1 and argument 2 are vectors.
SourceLocation BuiltinLoc = TheCall->getBeginLoc();
if ((!Arg1Ty->isVectorType() && !Arg1Ty->isDependentType()) ||
    (!Arg2Ty->isVectorType() && !Arg2Ty->isDependentType())) {
  return Diag(BuiltinLoc, diag::err_vec_builtin_non_vector)
         << TheCall->getDirectCallee()
         << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                        TheCall->getArg(1)->getEndLoc());
}

// Check the first two arguments are the same type.
if (!Context.hasSameUnqualifiedType(Arg1Ty, Arg2Ty)) {
  return Diag(BuiltinLoc, diag::err_vec_builtin_incompatible_vector)
         << TheCall->getDirectCallee()
         << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                        TheCall->getArg(1)->getEndLoc());
}

// When default clang type checking is turned off and the customized type
// checking is used, the returning type of the function must be explicitly
// set. Otherwise it is _Bool by default.
TheCall->setType(Arg1Ty);

return false;
6521}

6523/// SemaBuiltinShuffleVector - Handle __builtin_shufflevector.
6524// This is declared to take (...), so we have to check everything.
6525ExprResult Sema::SemaBuiltinShuffleVector(CallExpr *TheCall) {
if (TheCall->getNumArgs() < 2)
  return ExprError(Diag(TheCall->getEndLoc(),
                        diag::err_typecheck_call_too_few_args_at_least)
                   << 0 /*function call*/ << 2 << TheCall->getNumArgs()
                   << TheCall->getSourceRange());

// Determine which of the following types of shufflevector we're checking:
// 1) unary, vector mask: (lhs, mask)
// 2) binary, scalar mask: (lhs, rhs, index, ..., index)
QualType resType = TheCall->getArg(0)->getType();
unsigned numElements = 0;

if (!TheCall->getArg(0)->isTypeDependent() &&
    !TheCall->getArg(1)->isTypeDependent()) {
  QualType LHSType = TheCall->getArg(0)->getType();
  QualType RHSType = TheCall->getArg(1)->getType();

  if (!LHSType->isVectorType() || !RHSType->isVectorType())
    return ExprError(
        Diag(TheCall->getBeginLoc(), diag::err_vec_builtin_non_vector)
        << TheCall->getDirectCallee()
        << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                       TheCall->getArg(1)->getEndLoc()));

  numElements = LHSType->castAs<VectorType>()->getNumElements();
  unsigned numResElements = TheCall->getNumArgs() - 2;

  // Check to see if we have a call with 2 vector arguments, the unary shuffle
  // with mask.  If so, verify that RHS is an integer vector type with the
  // same number of elts as lhs.
  if (TheCall->getNumArgs() == 2) {
    if (!RHSType->hasIntegerRepresentation() ||
        RHSType->castAs<VectorType>()->getNumElements() != numElements)
      return ExprError(Diag(TheCall->getBeginLoc(),
                            diag::err_vec_builtin_incompatible_vector)
                       << TheCall->getDirectCallee()
                       << SourceRange(TheCall->getArg(1)->getBeginLoc(),
                                      TheCall->getArg(1)->getEndLoc()));
  } else if (!Context.hasSameUnqualifiedType(LHSType, RHSType)) {
    return ExprError(Diag(TheCall->getBeginLoc(),
                          diag::err_vec_builtin_incompatible_vector)
                     << TheCall->getDirectCallee()
                     << SourceRange(TheCall->getArg(0)->getBeginLoc(),
                                    TheCall->getArg(1)->getEndLoc()));
  } else if (numElements != numResElements) {
    QualType eltType = LHSType->castAs<VectorType>()->getElementType();
    resType = Context.getVectorType(eltType, numResElements,
                                    VectorType::GenericVector);
  }
}

for (unsigned i = 2; i < TheCall->getNumArgs(); i++) {
  if (TheCall->getArg(i)->isTypeDependent() ||
      TheCall->getArg(i)->isValueDependent())
    continue;

  Optional<llvm::APSInt> Result;
  if (!(Result = TheCall->getArg(i)->getIntegerConstantExpr(Context)))
    return ExprError(Diag(TheCall->getBeginLoc(),
                          diag::err_shufflevector_nonconstant_argument)
                     << TheCall->getArg(i)->getSourceRange());

  // Allow -1 which will be translated to undef in the IR.
  if (Result->isSigned() && Result->isAllOnesValue())
    continue;

  if (Result->getActiveBits() > 64 ||
      Result->getZExtValue() >= numElements * 2)
    return ExprError(Diag(TheCall->getBeginLoc(),
                          diag::err_shufflevector_argument_too_large)
                     << TheCall->getArg(i)->getSourceRange());
}

SmallVector<Expr*, 32> exprs;

for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; i++) {
  exprs.push_back(TheCall->getArg(i));
  TheCall->setArg(i, nullptr);
}

return new (Context) ShuffleVectorExpr(Context, exprs, resType,
                                       TheCall->getCallee()->getBeginLoc(),
                                       TheCall->getRParenLoc());
6609}

6611/// SemaConvertVectorExpr - Handle __builtin_convertvector
6612ExprResult Sema::SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
                                     SourceLocation BuiltinLoc,
                                     SourceLocation RParenLoc) {
ExprValueKind VK = VK_PRValue;
ExprObjectKind OK = OK_Ordinary;
QualType DstTy = TInfo->getType();
QualType SrcTy = E->getType();

if (!SrcTy->isVectorType() && !SrcTy->isDependentType())
  return ExprError(Diag(BuiltinLoc,
                        diag::err_convertvector_non_vector)
                   << E->getSourceRange());
if (!DstTy->isVectorType() && !DstTy->isDependentType())
  return ExprError(Diag(BuiltinLoc,
                        diag::err_convertvector_non_vector_type));

if (!SrcTy->isDependentType() && !DstTy->isDependentType()) {
  unsigned SrcElts = SrcTy->castAs<VectorType>()->getNumElements();
  unsigned DstElts = DstTy->castAs<VectorType>()->getNumElements();
  if (SrcElts != DstElts)
    return ExprError(Diag(BuiltinLoc,
                          diag::err_convertvector_incompatible_vector)
                     << E->getSourceRange());
}

return new (Context)
    ConvertVectorExpr(E, TInfo, DstTy, VK, OK, BuiltinLoc, RParenLoc);
6639}

6641/// SemaBuiltinPrefetch - Handle __builtin_prefetch.
6642// This is declared to take (const void*, ...) and can take two
6643// optional constant int args.
6644bool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) {
unsigned NumArgs = TheCall->getNumArgs();

if (NumArgs > 3)
  return Diag(TheCall->getEndLoc(),
              diag::err_typecheck_call_too_many_args_at_most)
         << 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();

// Argument 0 is checked for us and the remaining arguments must be
// constant integers.
for (unsigned i = 1; i != NumArgs; ++i)
  if (SemaBuiltinConstantArgRange(TheCall, i, 0, i == 1 ? 1 : 3))
    return true;

return false;
6659}

6661/// SemaBuiltinArithmeticFence - Handle __arithmetic_fence.
6662bool Sema::SemaBuiltinArithmeticFence(CallExpr *TheCall) {
if (!Context.getTargetInfo().checkArithmeticFenceSupported())
  return Diag(TheCall->getBeginLoc(), diag::err_builtin_target_unsupported)
         << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
if (checkArgCount(*this, TheCall, 1))
  return true;
Expr *Arg = TheCall->getArg(0);
if (Arg->isInstantiationDependent())
  return false;

QualType ArgTy = Arg->getType();
if (!ArgTy->hasFloatingRepresentation())
  return Diag(TheCall->getEndLoc(), diag::err_typecheck_expect_flt_or_vector)
         << ArgTy;
if (Arg->isLValue()) {
  ExprResult FirstArg = DefaultLvalueConversion(Arg);
  TheCall->setArg(0, FirstArg.get());
}
TheCall->setType(TheCall->getArg(0)->getType());
return false;
6682}

6684/// SemaBuiltinAssume - Handle __assume (MS Extension).
6685// __assume does not evaluate its arguments, and should warn if its argument
6686// has side effects.
6687bool Sema::SemaBuiltinAssume(CallExpr *TheCall) {
Expr *Arg = TheCall->getArg(0);
if (Arg->isInstantiationDependent()) return false;

if (Arg->HasSideEffects(Context))
  Diag(Arg->getBeginLoc(), diag::warn_assume_side_effects)
      << Arg->getSourceRange()
      << cast<FunctionDecl>(TheCall->getCalleeDecl())->getIdentifier();

return false;
6697}

6699/// Handle __builtin_alloca_with_align. This is declared
6700/// as (size_t, size_t) where the second size_t must be a power of 2 greater
6701/// than 8.
6702bool Sema::SemaBuiltinAllocaWithAlign(CallExpr *TheCall) {
// The alignment must be a constant integer.
Expr *Arg = TheCall->getArg(1);

// We can't check the value of a dependent argument.
if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
  if (const auto *UE =
          dyn_cast<UnaryExprOrTypeTraitExpr>(Arg->IgnoreParenImpCasts()))
    if (UE->getKind() == UETT_AlignOf ||
        UE->getKind() == UETT_PreferredAlignOf)
      Diag(TheCall->getBeginLoc(), diag::warn_alloca_align_alignof)
          << Arg->getSourceRange();

  llvm::APSInt Result = Arg->EvaluateKnownConstInt(Context);

  if (!Result.isPowerOf2())
    return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
           << Arg->getSourceRange();

  if (Result < Context.getCharWidth())
    return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_small)
           << (unsigned)Context.getCharWidth() << Arg->getSourceRange();

  if (Result > std::numeric_limits<int32_t>::max())
    return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_big)
           << std::numeric_limits<int32_t>::max() << Arg->getSourceRange();
}

return false;
6731}

6733/// Handle __builtin_assume_aligned. This is declared
6734/// as (const void*, size_t, ...) and can take one optional constant int arg.
6735bool Sema::SemaBuiltinAssumeAligned(CallExpr *TheCall) {
unsigned NumArgs = TheCall->getNumArgs();

if (NumArgs > 3)
  return Diag(TheCall->getEndLoc(),
              diag::err_typecheck_call_too_many_args_at_most)
         << 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();

// The alignment must be a constant integer.
Expr *Arg = TheCall->getArg(1);

// We can't check the value of a dependent argument.
if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
  llvm::APSInt Result;
  if (SemaBuiltinConstantArg(TheCall, 1, Result))
    return true;

  if (!Result.isPowerOf2())
    return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
           << Arg->getSourceRange();

  if (Result > Sema::MaximumAlignment)
    Diag(TheCall->getBeginLoc(), diag::warn_assume_aligned_too_great)
        << Arg->getSourceRange() << Sema::MaximumAlignment;
}

if (NumArgs > 2) {
  ExprResult Arg(TheCall->getArg(2));
  InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
    Context.getSizeType(), false);
  Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
  if (Arg.isInvalid()) return true;
  TheCall->setArg(2, Arg.get());
}

return false;
6771}

6773bool Sema::SemaBuiltinOSLogFormat(CallExpr *TheCall) {
unsigned BuiltinID =
    cast<FunctionDecl>(TheCall->getCalleeDecl())->getBuiltinID();
bool IsSizeCall = BuiltinID == Builtin::BI__builtin_os_log_format_buffer_size;

unsigned NumArgs = TheCall->getNumArgs();
unsigned NumRequiredArgs = IsSizeCall ? 1 : 2;
if (NumArgs < NumRequiredArgs) {
  return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
         << 0 /* function call */ << NumRequiredArgs << NumArgs
         << TheCall->getSourceRange();
}
if (NumArgs >= NumRequiredArgs + 0x100) {
  return Diag(TheCall->getEndLoc(),
              diag::err_typecheck_call_too_many_args_at_most)
         << 0 /* function call */ << (NumRequiredArgs + 0xff) << NumArgs
         << TheCall->getSourceRange();
}
unsigned i = 0;

// For formatting call, check buffer arg.
if (!IsSizeCall) {
  ExprResult Arg(TheCall->getArg(i));
  InitializedEntity Entity = InitializedEntity::InitializeParameter(
      Context, Context.VoidPtrTy, false);
  Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
  if (Arg.isInvalid())
    return true;
  TheCall->setArg(i, Arg.get());
  i++;
}

// Check string literal arg.
unsigned FormatIdx = i;
{
  ExprResult Arg = CheckOSLogFormatStringArg(TheCall->getArg(i));
  if (Arg.isInvalid())
    return true;
  TheCall->setArg(i, Arg.get());
  i++;
}

// Make sure variadic args are scalar.
unsigned FirstDataArg = i;
while (i < NumArgs) {
  ExprResult Arg = DefaultVariadicArgumentPromotion(
      TheCall->getArg(i), VariadicFunction, nullptr);
  if (Arg.isInvalid())
    return true;
  CharUnits ArgSize = Context.getTypeSizeInChars(Arg.get()->getType());
  if (ArgSize.getQuantity() >= 0x100) {
    return Diag(Arg.get()->getEndLoc(), diag::err_os_log_argument_too_big)
           << i << (int)ArgSize.getQuantity() << 0xff
           << TheCall->getSourceRange();
  }
  TheCall->setArg(i, Arg.get());
  i++;
}

// Check formatting specifiers. NOTE: We're only doing this for the non-size
// call to avoid duplicate diagnostics.
if (!IsSizeCall) {
  llvm::SmallBitVector CheckedVarArgs(NumArgs, false);
  ArrayRef<const Expr *> Args(TheCall->getArgs(), TheCall->getNumArgs());
  bool Success = CheckFormatArguments(
      Args, /*HasVAListArg*/ false, FormatIdx, FirstDataArg, FST_OSLog,
      VariadicFunction, TheCall->getBeginLoc(), SourceRange(),
      CheckedVarArgs);
  if (!Success)
    return true;
}

if (IsSizeCall) {
  TheCall->setType(Context.getSizeType());
} else {
  TheCall->setType(Context.VoidPtrTy);
}
return false;
6851}

6853/// SemaBuiltinConstantArg - Handle a check if argument ArgNum of CallExpr
6854/// TheCall is a constant expression.
6855bool Sema::SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
                                llvm::APSInt &Result) {
Expr *Arg = TheCall->getArg(ArgNum);
DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());

if (Arg->isTypeDependent() || Arg->isValueDependent()) return false;

Optional<llvm::APSInt> R;
if (!(R = Arg->getIntegerConstantExpr(Context)))
  return Diag(TheCall->getBeginLoc(), diag::err_constant_integer_arg_type)
         << FDecl->getDeclName() << Arg->getSourceRange();
Result = *R;
return false;
6869}

6871/// SemaBuiltinConstantArgRange - Handle a check if argument ArgNum of CallExpr
6872/// TheCall is a constant expression in the range [Low, High].
6873bool Sema::SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
                                     int Low, int High, bool RangeIsError) {
if (isConstantEvaluated())
  return false;
llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

if (Result.getSExtValue() < Low || Result.getSExtValue() > High) {
  if (RangeIsError)
    return Diag(TheCall->getBeginLoc(), diag::err_argument_invalid_range)
           << toString(Result, 10) << Low << High << Arg->getSourceRange();
  else
    // Defer the warning until we know if the code will be emitted so that
    // dead code can ignore this.
    DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
                        PDiag(diag::warn_argument_invalid_range)
                            << toString(Result, 10) << Low << High
                            << Arg->getSourceRange());
}

return false;
6902}

6904/// SemaBuiltinConstantArgMultiple - Handle a check if argument ArgNum of CallExpr
6905/// TheCall is a constant expression is a multiple of Num..
6906bool Sema::SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
                                        unsigned Num) {
llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

if (Result.getSExtValue() % Num != 0)
  return Diag(TheCall->getBeginLoc(), diag::err_argument_not_multiple)
         << Num << Arg->getSourceRange();

return false;
6924}

6926/// SemaBuiltinConstantArgPower2 - Check if argument ArgNum of TheCall is a
6927/// constant expression representing a power of 2.
6928bool Sema::SemaBuiltinConstantArgPower2(CallExpr *TheCall, int ArgNum) {
llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

// Bit-twiddling to test for a power of 2: for x > 0, x & (x-1) is zero if
// and only if x is a power of 2.
if (Result.isStrictlyPositive() && (Result & (Result - 1)) == 0)
  return false;

return Diag(TheCall->getBeginLoc(), diag::err_argument_not_power_of_2)
       << Arg->getSourceRange();
6947}

6949static bool IsShiftedByte(llvm::APSInt Value) {
if (Value.isNegative())
  return false;

// Check if it's a shifted byte, by shifting it down
while (true) {
  // If the value fits in the bottom byte, the check passes.
  if (Value < 0x100)
    return true;

  // Otherwise, if the value has _any_ bits in the bottom byte, the check
  // fails.
  if ((Value & 0xFF) != 0)
    return false;

  // If the bottom 8 bits are all 0, but something above that is nonzero,
  // then shifting the value right by 8 bits won't affect whether it's a
  // shifted byte or not. So do that, and go round again.
  Value >>= 8;
}
6969}

6971/// SemaBuiltinConstantArgShiftedByte - Check if argument ArgNum of TheCall is
6972/// a constant expression representing an arbitrary byte value shifted left by
6973/// a multiple of 8 bits.
6974bool Sema::SemaBuiltinConstantArgShiftedByte(CallExpr *TheCall, int ArgNum,
                                           unsigned ArgBits) {
llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

// Truncate to the given size.
Result = Result.getLoBits(ArgBits);
Result.setIsUnsigned(true);

if (IsShiftedByte(Result))
  return false;

return Diag(TheCall->getBeginLoc(), diag::err_argument_not_shifted_byte)
       << Arg->getSourceRange();
6996}

6998/// SemaBuiltinConstantArgShiftedByteOr0xFF - Check if argument ArgNum of
6999/// TheCall is a constant expression representing either a shifted byte value,
7000/// or a value of the form 0x??FF (i.e. a member of the arithmetic progression
7001/// 0x00FF, 0x01FF, ..., 0xFFFF). This strange range check is needed for some
7002/// Arm MVE intrinsics.
7003bool Sema::SemaBuiltinConstantArgShiftedByteOrXXFF(CallExpr *TheCall,
                                                 int ArgNum,
                                                 unsigned ArgBits) {
llvm::APSInt Result;

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
  return true;

// Truncate to the given size.
Result = Result.getLoBits(ArgBits);
Result.setIsUnsigned(true);

// Check to see if it's in either of the required forms.
if (IsShiftedByte(Result) ||
    (Result > 0 && Result < 0x10000 && (Result & 0xFF) == 0xFF))
  return false;

return Diag(TheCall->getBeginLoc(),
            diag::err_argument_not_shifted_byte_or_xxff)
       << Arg->getSourceRange();
7029}

7031/// SemaBuiltinARMMemoryTaggingCall - Handle calls of memory tagging extensions
7032bool Sema::SemaBuiltinARMMemoryTaggingCall(unsigned BuiltinID, CallExpr *TheCall) {
if (BuiltinID == AArch64::BI__builtin_arm_irg) {
  if (checkArgCount(*this, TheCall, 2))
    return true;
  Expr *Arg0 = TheCall->getArg(0);
  Expr *Arg1 = TheCall->getArg(1);

  ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
  if (FirstArg.isInvalid())
    return true;
  QualType FirstArgType = FirstArg.get()->getType();
  if (!FirstArgType->isAnyPointerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
             << "first" << FirstArgType << Arg0->getSourceRange();
  TheCall->setArg(0, FirstArg.get());

  ExprResult SecArg = DefaultLvalueConversion(Arg1);
  if (SecArg.isInvalid())
    return true;
  QualType SecArgType = SecArg.get()->getType();
  if (!SecArgType->isIntegerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_integer)
             << "second" << SecArgType << Arg1->getSourceRange();

  // Derive the return type from the pointer argument.
  TheCall->setType(FirstArgType);
  return false;
}

if (BuiltinID == AArch64::BI__builtin_arm_addg) {
  if (checkArgCount(*this, TheCall, 2))
    return true;

  Expr *Arg0 = TheCall->getArg(0);
  ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
  if (FirstArg.isInvalid())
    return true;
  QualType FirstArgType = FirstArg.get()->getType();
  if (!FirstArgType->isAnyPointerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
             << "first" << FirstArgType << Arg0->getSourceRange();
  TheCall->setArg(0, FirstArg.get());

  // Derive the return type from the pointer argument.
  TheCall->setType(FirstArgType);

  // Second arg must be an constant in range [0,15]
  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
}

if (BuiltinID == AArch64::BI__builtin_arm_gmi) {
  if (checkArgCount(*this, TheCall, 2))
    return true;
  Expr *Arg0 = TheCall->getArg(0);
  Expr *Arg1 = TheCall->getArg(1);

  ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
  if (FirstArg.isInvalid())
    return true;
  QualType FirstArgType = FirstArg.get()->getType();
  if (!FirstArgType->isAnyPointerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
             << "first" << FirstArgType << Arg0->getSourceRange();

  QualType SecArgType = Arg1->getType();
  if (!SecArgType->isIntegerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_integer)
             << "second" << SecArgType << Arg1->getSourceRange();
  TheCall->setType(Context.IntTy);
  return false;
}

if (BuiltinID == AArch64::BI__builtin_arm_ldg ||
    BuiltinID == AArch64::BI__builtin_arm_stg) {
  if (checkArgCount(*this, TheCall, 1))
    return true;
  Expr *Arg0 = TheCall->getArg(0);
  ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
  if (FirstArg.isInvalid())
    return true;

  QualType FirstArgType = FirstArg.get()->getType();
  if (!FirstArgType->isAnyPointerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
             << "first" << FirstArgType << Arg0->getSourceRange();
  TheCall->setArg(0, FirstArg.get());

  // Derive the return type from the pointer argument.
  if (BuiltinID == AArch64::BI__builtin_arm_ldg)
    TheCall->setType(FirstArgType);
  return false;
}

if (BuiltinID == AArch64::BI__builtin_arm_subp) {
  Expr *ArgA = TheCall->getArg(0);
  Expr *ArgB = TheCall->getArg(1);

  ExprResult ArgExprA = DefaultFunctionArrayLvalueConversion(ArgA);
  ExprResult ArgExprB = DefaultFunctionArrayLvalueConversion(ArgB);

  if (ArgExprA.isInvalid() || ArgExprB.isInvalid())
    return true;

  QualType ArgTypeA = ArgExprA.get()->getType();
  QualType ArgTypeB = ArgExprB.get()->getType();

  auto isNull = [&] (Expr *E) -> bool {
    return E->isNullPointerConstant(
                      Context, Expr::NPC_ValueDependentIsNotNull); };

  // argument should be either a pointer or null
  if (!ArgTypeA->isAnyPointerType() && !isNull(ArgA))
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_null_or_pointer)
      << "first" << ArgTypeA << ArgA->getSourceRange();

  if (!ArgTypeB->isAnyPointerType() && !isNull(ArgB))
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_null_or_pointer)
      << "second" << ArgTypeB << ArgB->getSourceRange();

  // Ensure Pointee types are compatible
  if (ArgTypeA->isAnyPointerType() && !isNull(ArgA) &&
      ArgTypeB->isAnyPointerType() && !isNull(ArgB)) {
    QualType pointeeA = ArgTypeA->getPointeeType();
    QualType pointeeB = ArgTypeB->getPointeeType();
    if (!Context.typesAreCompatible(
           Context.getCanonicalType(pointeeA).getUnqualifiedType(),
           Context.getCanonicalType(pointeeB).getUnqualifiedType())) {
      return Diag(TheCall->getBeginLoc(), diag::err_typecheck_sub_ptr_compatible)
        << ArgTypeA <<  ArgTypeB << ArgA->getSourceRange()
        << ArgB->getSourceRange();
    }
  }

  // at least one argument should be pointer type
  if (!ArgTypeA->isAnyPointerType() && !ArgTypeB->isAnyPointerType())
    return Diag(TheCall->getBeginLoc(), diag::err_memtag_any2arg_pointer)
      <<  ArgTypeA << ArgTypeB << ArgA->getSourceRange();

  if (isNull(ArgA)) // adopt type of the other pointer
    ArgExprA = ImpCastExprToType(ArgExprA.get(), ArgTypeB, CK_NullToPointer);

  if (isNull(ArgB))
    ArgExprB = ImpCastExprToType(ArgExprB.get(), ArgTypeA, CK_NullToPointer);

  TheCall->setArg(0, ArgExprA.get());
  TheCall->setArg(1, ArgExprB.get());
  TheCall->setType(Context.LongLongTy);
  return false;
}
assert(false && "Unhandled ARM MTE intrinsic")((void)0);
return true;
7183}

7185/// SemaBuiltinARMSpecialReg - Handle a check if argument ArgNum of CallExpr
7186/// TheCall is an ARM/AArch64 special register string literal.
7187bool Sema::SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
                                  int ArgNum, unsigned ExpectedFieldNum,
                                  bool AllowName) {
bool IsARMBuiltin = BuiltinID == ARM::BI__builtin_arm_rsr64 ||
                    BuiltinID == ARM::BI__builtin_arm_wsr64 ||
                    BuiltinID == ARM::BI__builtin_arm_rsr ||
                    BuiltinID == ARM::BI__builtin_arm_rsrp ||
                    BuiltinID == ARM::BI__builtin_arm_wsr ||
                    BuiltinID == ARM::BI__builtin_arm_wsrp;
bool IsAArch64Builtin = BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
                        BuiltinID == AArch64::BI__builtin_arm_wsr64 ||
                        BuiltinID == AArch64::BI__builtin_arm_rsr ||
                        BuiltinID == AArch64::BI__builtin_arm_rsrp ||
                        BuiltinID == AArch64::BI__builtin_arm_wsr ||
                        BuiltinID == AArch64::BI__builtin_arm_wsrp;
assert((IsARMBuiltin || IsAArch64Builtin) && "Unexpected ARM builtin.")((void)0);

// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
  return false;

// Check if the argument is a string literal.
if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
  return Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
         << Arg->getSourceRange();

// Check the type of special register given.
StringRef Reg = cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
SmallVector<StringRef, 6> Fields;
Reg.split(Fields, ":");

if (Fields.size() != ExpectedFieldNum && !(AllowName && Fields.size() == 1))
  return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
         << Arg->getSourceRange();

// If the string is the name of a register then we cannot check that it is
// valid here but if the string is of one the forms described in ACLE then we
// can check that the supplied fields are integers and within the valid
// ranges.
if (Fields.size() > 1) {
  bool FiveFields = Fields.size() == 5;

  bool ValidString = true;
  if (IsARMBuiltin) {
    ValidString &= Fields[0].startswith_insensitive("cp") ||
                   Fields[0].startswith_insensitive("p");
    if (ValidString)
      Fields[0] = Fields[0].drop_front(
          Fields[0].startswith_insensitive("cp") ? 2 : 1);

    ValidString &= Fields[2].startswith_insensitive("c");
    if (ValidString)
      Fields[2] = Fields[2].drop_front(1);

    if (FiveFields) {
      ValidString &= Fields[3].startswith_insensitive("c");
      if (ValidString)
        Fields[3] = Fields[3].drop_front(1);
    }
  }

  SmallVector<int, 5> Ranges;
  if (FiveFields)
    Ranges.append({IsAArch64Builtin ? 1 : 15, 7, 15, 15, 7});
  else
    Ranges.append({15, 7, 15});

  for (unsigned i=0; i<Fields.size(); ++i) {
    int IntField;
    ValidString &= !Fields[i].getAsInteger(10, IntField);
    ValidString &= (IntField >= 0 && IntField <= Ranges[i]);
  }

  if (!ValidString)
    return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
           << Arg->getSourceRange();
} else if (IsAArch64Builtin && Fields.size() == 1) {
  // If the register name is one of those that appear in the condition below
  // and the special register builtin being used is one of the write builtins,
  // then we require that the argument provided for writing to the register
  // is an integer constant expression. This is because it will be lowered to
  // an MSR (immediate) instruction, so we need to know the immediate at
  // compile time.
  if (TheCall->getNumArgs() != 2)
    return false;

  std::string RegLower = Reg.lower();
  if (RegLower != "spsel" && RegLower != "daifset" && RegLower != "daifclr" &&
      RegLower != "pan" && RegLower != "uao")
    return false;

  return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
}

return false;
7283}

7285/// SemaBuiltinPPCMMACall - Check the call to a PPC MMA builtin for validity.
7286/// Emit an error and return true on failure; return false on success.
7287/// TypeStr is a string containing the type descriptor of the value returned by
7288/// the builtin and the descriptors of the expected type of the arguments.
7289bool Sema::SemaBuiltinPPCMMACall(CallExpr *TheCall, const char *TypeStr) {

assert((TypeStr[0] != '\0') &&((void)0)
       "Invalid types in PPC MMA builtin declaration")((void)0);

unsigned Mask = 0;
unsigned ArgNum = 0;

// The first type in TypeStr is the type of the value returned by the
// builtin. So we first read that type and change the type of TheCall.
QualType type = DecodePPCMMATypeFromStr(Context, TypeStr, Mask);
TheCall->setType(type);

while (*TypeStr != '\0') {
  Mask = 0;
  QualType ExpectedType = DecodePPCMMATypeFromStr(Context, TypeStr, Mask);
  if (ArgNum >= TheCall->getNumArgs()) {
    ArgNum++;
    break;
  }

  Expr *Arg = TheCall->getArg(ArgNum);
  QualType ArgType = Arg->getType();

  if ((ExpectedType->isVoidPointerType() && !ArgType->isPointerType()) ||
      (!ExpectedType->isVoidPointerType() &&
         ArgType.getCanonicalType() != ExpectedType))
    return Diag(Arg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
           << ArgType << ExpectedType << 1 << 0 << 0;

  // If the value of the Mask is not 0, we have a constraint in the size of
  // the integer argument so here we ensure the argument is a constant that
  // is in the valid range.
  if (Mask != 0 &&
      SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, Mask, true))
    return true;

  ArgNum++;
}

// In case we exited early from the previous loop, there are other types to
// read from TypeStr. So we need to read them all to ensure we have the right
// number of arguments in TheCall and if it is not the case, to display a
// better error message.
while (*TypeStr != '\0') {
  (void) DecodePPCMMATypeFromStr(Context, TypeStr, Mask);
  ArgNum++;
}
if (checkArgCount(*this, TheCall, ArgNum))
  return true;

return false;
7341}

7343/// SemaBuiltinLongjmp - Handle __builtin_longjmp(void *env[5], int val).
7344/// This checks that the target supports __builtin_longjmp and
7345/// that val is a constant 1.
7346bool Sema::SemaBuiltinLongjmp(CallExpr *TheCall) {
if (!Context.getTargetInfo().hasSjLjLowering())
  return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_unsupported)
         << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());

Expr *Arg = TheCall->getArg(1);
llvm::APSInt Result;

// TODO: This is less than ideal. Overload this to take a value.
if (SemaBuiltinConstantArg(TheCall, 1, Result))
  return true;

if (Result != 1)
  return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_invalid_val)
         << SourceRange(Arg->getBeginLoc(), Arg->getEndLoc());

return false;
7363}

7365/// SemaBuiltinSetjmp - Handle __builtin_setjmp(void *env[5]).
7366/// This checks that the target supports __builtin_setjmp.
7367bool Sema::SemaBuiltinSetjmp(CallExpr *TheCall) {
if (!Context.getTargetInfo().hasSjLjLowering())
  return Diag(TheCall->getBeginLoc(), diag::err_builtin_setjmp_unsupported)
         << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
return false;
7372}

7374namespace {

7376class UncoveredArgHandler {
enum { Unknown = -1, AllCovered = -2 };

signed FirstUncoveredArg = Unknown;
SmallVector<const Expr *, 4> DiagnosticExprs;

7382public:
UncoveredArgHandler() = default;

bool hasUncoveredArg() const {
  return (FirstUncoveredArg >= 0);
}

unsigned getUncoveredArg() const {
  assert(hasUncoveredArg() && "no uncovered argument")((void)0);
  return FirstUncoveredArg;
}

void setAllCovered() {
  // A string has been found with all arguments covered, so clear out
  // the diagnostics.
  DiagnosticExprs.clear();
  FirstUncoveredArg = AllCovered;
}

void Update(signed NewFirstUncoveredArg, const Expr *StrExpr) {
  assert(NewFirstUncoveredArg >= 0 && "Outside range")((void)0);

  // Don't update if a previous string covers all arguments.
  if (FirstUncoveredArg == AllCovered)
    return;

  // UncoveredArgHandler tracks the highest uncovered argument index
  // and with it all the strings that match this index.
  if (NewFirstUncoveredArg == FirstUncoveredArg)
    DiagnosticExprs.push_back(StrExpr);
  else if (NewFirstUncoveredArg > FirstUncoveredArg) {
    DiagnosticExprs.clear();
    DiagnosticExprs.push_back(StrExpr);
    FirstUncoveredArg = NewFirstUncoveredArg;
  }
}

void Diagnose(Sema &S, bool IsFunctionCall, const Expr *ArgExpr);
7420};

7422enum StringLiteralCheckType {
SLCT_NotALiteral,
SLCT_UncheckedLiteral,
SLCT_CheckedLiteral
7426};

7428} // namespace

7430static void sumOffsets(llvm::APSInt &Offset, llvm::APSInt Addend,
                                   BinaryOperatorKind BinOpKind,
                                   bool AddendIsRight) {
unsigned BitWidth = Offset.getBitWidth();
unsigned AddendBitWidth = Addend.getBitWidth();
// There might be negative interim results.
if (Addend.isUnsigned()) {
  Addend = Addend.zext(++AddendBitWidth);
  Addend.setIsSigned(true);
}
// Adjust the bit width of the APSInts.
if (AddendBitWidth > BitWidth) {
  Offset = Offset.sext(AddendBitWidth);
  BitWidth = AddendBitWidth;
} else if (BitWidth > AddendBitWidth) {
  Addend = Addend.sext(BitWidth);
}

bool Ov = false;
llvm::APSInt ResOffset = Offset;
if (BinOpKind == BO_Add)
  ResOffset = Offset.sadd_ov(Addend, Ov);
else {
  assert(AddendIsRight && BinOpKind == BO_Sub &&((void)0)
         "operator must be add or sub with addend on the right")((void)0);
  ResOffset = Offset.ssub_ov(Addend, Ov);
}

// We add an offset to a pointer here so we should support an offset as big as
// possible.
if (Ov) {
  assert(BitWidth <= std::numeric_limits<unsigned>::max() / 2 &&((void)0)
         "index (intermediate) result too big")((void)0);
  Offset = Offset.sext(2 * BitWidth);
  sumOffsets(Offset, Addend, BinOpKind, AddendIsRight);
  return;
}

Offset = ResOffset;
7469}

7471namespace {

7473// This is a wrapper class around StringLiteral to support offsetted string
7474// literals as format strings. It takes the offset into account when returning
7475// the string and its length or the source locations to display notes correctly.
7476class FormatStringLiteral {
const StringLiteral *FExpr;
int64_t Offset;

public:
FormatStringLiteral(const StringLiteral *fexpr, int64_t Offset = 0)
    : FExpr(fexpr), Offset(Offset) {}

StringRef getString() const {
  return FExpr->getString().drop_front(Offset);
}

unsigned getByteLength() const {
  return FExpr->getByteLength() - getCharByteWidth() * Offset;
}

unsigned getLength() const { return FExpr->getLength() - Offset; }
unsigned getCharByteWidth() const { return FExpr->getCharByteWidth(); }

StringLiteral::StringKind getKind() const { return FExpr->getKind(); }

QualType getType() const { return FExpr->getType(); }

bool isAscii() const { return FExpr->isAscii(); }
bool isWide() const { return FExpr->isWide(); }
bool isUTF8() const { return FExpr->isUTF8(); }
bool isUTF16() const { return FExpr->isUTF16(); }
bool isUTF32() const { return FExpr->isUTF32(); }
bool isPascal() const { return FExpr->isPascal(); }

SourceLocation getLocationOfByte(
    unsigned ByteNo, const SourceManager &SM, const LangOptions &Features,
    const TargetInfo &Target, unsigned *StartToken = nullptr,
    unsigned *StartTokenByteOffset = nullptr) const {
  return FExpr->getLocationOfByte(ByteNo + Offset, SM, Features, Target,
                                  StartToken, StartTokenByteOffset);
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return FExpr->getBeginLoc().getLocWithOffset(Offset);
}

SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return FExpr->getEndLoc(); }
7519};

7521}  // namespace

7523static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
                            const Expr *OrigFormatExpr,
                            ArrayRef<const Expr *> Args,
                            bool HasVAListArg, unsigned format_idx,
                            unsigned firstDataArg,
                            Sema::FormatStringType Type,
                            bool inFunctionCall,
                            Sema::VariadicCallType CallType,
                            llvm::SmallBitVector &CheckedVarArgs,
                            UncoveredArgHandler &UncoveredArg,
                            bool IgnoreStringsWithoutSpecifiers);

7535// Determine if an expression is a string literal or constant string.
7536// If this function returns false on the arguments to a function expecting a
7537// format string, we will usually need to emit a warning.
7538// True string literals are then checked by CheckFormatString.
7539static StringLiteralCheckType
7540checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
                    bool HasVAListArg, unsigned format_idx,
                    unsigned firstDataArg, Sema::FormatStringType Type,
                    Sema::VariadicCallType CallType, bool InFunctionCall,
                    llvm::SmallBitVector &CheckedVarArgs,
                    UncoveredArgHandler &UncoveredArg,
                    llvm::APSInt Offset,
                    bool IgnoreStringsWithoutSpecifiers = false) {
if (S.isConstantEvaluated())
  return SLCT_NotALiteral;
tryAgain:
assert(Offset.isSigned() && "invalid offset")((void)0);

if (E->isTypeDependent() || E->isValueDependent())
  return SLCT_NotALiteral;

E = E->IgnoreParenCasts();

if (E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull))
  // Technically -Wformat-nonliteral does not warn about this case.
  // The behavior of printf and friends in this case is implementation
  // dependent.  Ideally if the format string cannot be null then
  // it should have a 'nonnull' attribute in the function prototype.
  return SLCT_UncheckedLiteral;

switch (E->getStmtClass()) {
case Stmt::BinaryConditionalOperatorClass:
case Stmt::ConditionalOperatorClass: {
  // The expression is a literal if both sub-expressions were, and it was
  // completely checked only if both sub-expressions were checked.
  const AbstractConditionalOperator *C =
      cast<AbstractConditionalOperator>(E);

  // Determine whether it is necessary to check both sub-expressions, for
  // example, because the condition expression is a constant that can be
  // evaluated at compile time.
  bool CheckLeft = true, CheckRight = true;

  bool Cond;
  if (C->getCond()->EvaluateAsBooleanCondition(Cond, S.getASTContext(),
                                               S.isConstantEvaluated())) {
    if (Cond)
      CheckRight = false;
    else
      CheckLeft = false;
  }

  // We need to maintain the offsets for the right and the left hand side
  // separately to check if every possible indexed expression is a valid
  // string literal. They might have different offsets for different string
  // literals in the end.
  StringLiteralCheckType Left;
  if (!CheckLeft)
    Left = SLCT_UncheckedLiteral;
  else {
    Left = checkFormatStringExpr(S, C->getTrueExpr(), Args,
                                 HasVAListArg, format_idx, firstDataArg,
                                 Type, CallType, InFunctionCall,
                                 CheckedVarArgs, UncoveredArg, Offset,
                                 IgnoreStringsWithoutSpecifiers);
    if (Left == SLCT_NotALiteral || !CheckRight) {
      return Left;
    }
  }

  StringLiteralCheckType Right = checkFormatStringExpr(
      S, C->getFalseExpr(), Args, HasVAListArg, format_idx, firstDataArg,
      Type, CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
      IgnoreStringsWithoutSpecifiers);

  return (CheckLeft && Left < Right) ? Left : Right;
}

case Stmt::ImplicitCastExprClass:
  E = cast<ImplicitCastExpr>(E)->getSubExpr();
  goto tryAgain;

case Stmt::OpaqueValueExprClass:
  if (const Expr *src = cast<OpaqueValueExpr>(E)->getSourceExpr()) {
    E = src;
    goto tryAgain;
  }
  return SLCT_NotALiteral;

case Stmt::PredefinedExprClass:
  // While __func__, etc., are technically not string literals, they
  // cannot contain format specifiers and thus are not a security
  // liability.
  return SLCT_UncheckedLiteral;

case Stmt::DeclRefExprClass: {
  const DeclRefExpr *DR = cast<DeclRefExpr>(E);

  // As an exception, do not flag errors for variables binding to
  // const string literals.
  if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
    bool isConstant = false;
    QualType T = DR->getType();

    if (const ArrayType *AT = S.Context.getAsArrayType(T)) {
      isConstant = AT->getElementType().isConstant(S.Context);
    } else if (const PointerType *PT = T->getAs<PointerType>()) {
      isConstant = T.isConstant(S.Context) &&
                   PT->getPointeeType().isConstant(S.Context);
    } else if (T->isObjCObjectPointerType()) {
      // In ObjC, there is usually no "const ObjectPointer" type,
      // so don't check if the pointee type is constant.
      isConstant = T.isConstant(S.Context);
    }

    if (isConstant) {
      if (const Expr *Init = VD->getAnyInitializer()) {
        // Look through initializers like const char c[] = { "foo" }
        if (const InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
          if (InitList->isStringLiteralInit())
            Init = InitList->getInit(0)->IgnoreParenImpCasts();
        }
        return checkFormatStringExpr(S, Init, Args,
                                     HasVAListArg, format_idx,
                                     firstDataArg, Type, CallType,
                                     /*InFunctionCall*/ false, CheckedVarArgs,
                                     UncoveredArg, Offset);
      }
    }

    // For vprintf* functions (i.e., HasVAListArg==true), we add a
    // special check to see if the format string is a function parameter
    // of the function calling the printf function.  If the function
    // has an attribute indicating it is a printf-like function, then we
    // should suppress warnings concerning non-literals being used in a call
    // to a vprintf function.  For example:
    //
    // void
    // logmessage(char const *fmt __attribute__ (format (printf, 1, 2)), ...){
    //      va_list ap;
    //      va_start(ap, fmt);
    //      vprintf(fmt, ap);  // Do NOT emit a warning about "fmt".
    //      ...
    // }
    if (HasVAListArg) {
      if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(VD)) {
        if (const NamedDecl *ND = dyn_cast<NamedDecl>(PV->getDeclContext())) {
          int PVIndex = PV->getFunctionScopeIndex() + 1;
          for (const auto *PVFormat : ND->specific_attrs<FormatAttr>()) {
            // adjust for implicit parameter
            if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
              if (MD->isInstance())
                ++PVIndex;
            // We also check if the formats are compatible.
            // We can't pass a 'scanf' string to a 'printf' function.
            if (PVIndex == PVFormat->getFormatIdx() &&
                Type == S.GetFormatStringType(PVFormat))
              return SLCT_UncheckedLiteral;
          }
        }
      }
    }
  }

  return SLCT_NotALiteral;
}

case Stmt::CallExprClass:
case Stmt::CXXMemberCallExprClass: {
  const CallExpr *CE = cast<CallExpr>(E);
  if (const NamedDecl *ND = dyn_cast_or_null<NamedDecl>(CE->getCalleeDecl())) {
    bool IsFirst = true;
    StringLiteralCheckType CommonResult;
    for (const auto *FA : ND->specific_attrs<FormatArgAttr>()) {
      const Expr *Arg = CE->getArg(FA->getFormatIdx().getASTIndex());
      StringLiteralCheckType Result = checkFormatStringExpr(
          S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
          CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
          IgnoreStringsWithoutSpecifiers);
      if (IsFirst) {
        CommonResult = Result;
        IsFirst = false;
      }
    }
    if (!IsFirst)
      return CommonResult;

    if (const auto *FD = dyn_cast<FunctionDecl>(ND)) {
      unsigned BuiltinID = FD->getBuiltinID();
      if (BuiltinID == Builtin::BI__builtin___CFStringMakeConstantString ||
          BuiltinID == Builtin::BI__builtin___NSStringMakeConstantString) {
        const Expr *Arg = CE->getArg(0);
        return checkFormatStringExpr(S, Arg, Args,
                                     HasVAListArg, format_idx,
                                     firstDataArg, Type, CallType,
                                     InFunctionCall, CheckedVarArgs,
                                     UncoveredArg, Offset,
                                     IgnoreStringsWithoutSpecifiers);
      }
    }
  }

  return SLCT_NotALiteral;
}
case Stmt::ObjCMessageExprClass: {
  const auto *ME = cast<ObjCMessageExpr>(E);
  if (const auto *MD = ME->getMethodDecl()) {
    if (const auto *FA = MD->getAttr<FormatArgAttr>()) {
      // As a special case heuristic, if we're using the method -[NSBundle
      // localizedStringForKey:value:table:], ignore any key strings that lack
      // format specifiers. The idea is that if the key doesn't have any
      // format specifiers then its probably just a key to map to the
      // localized strings. If it does have format specifiers though, then its
      // likely that the text of the key is the format string in the
      // programmer's language, and should be checked.
      const ObjCInterfaceDecl *IFace;
      if (MD->isInstanceMethod() && (IFace = MD->getClassInterface()) &&
          IFace->getIdentifier()->isStr("NSBundle") &&
          MD->getSelector().isKeywordSelector(
              {"localizedStringForKey", "value", "table"})) {
        IgnoreStringsWithoutSpecifiers = true;
      }

      const Expr *Arg = ME->getArg(FA->getFormatIdx().getASTIndex());
      return checkFormatStringExpr(
          S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
          CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
          IgnoreStringsWithoutSpecifiers);
    }
  }

  return SLCT_NotALiteral;
}
case Stmt::ObjCStringLiteralClass:
case Stmt::StringLiteralClass: {
  const StringLiteral *StrE = nullptr;

  if (const ObjCStringLiteral *ObjCFExpr = dyn_cast<ObjCStringLiteral>(E))
    StrE = ObjCFExpr->getString();
  else
    StrE = cast<StringLiteral>(E);

  if (StrE) {
    if (Offset.isNegative() || Offset > StrE->getLength()) {
      // TODO: It would be better to have an explicit warning for out of
      // bounds literals.
      return SLCT_NotALiteral;
    }
    FormatStringLiteral FStr(StrE, Offset.sextOrTrunc(64).getSExtValue());
    CheckFormatString(S, &FStr, E, Args, HasVAListArg, format_idx,
                      firstDataArg, Type, InFunctionCall, CallType,
                      CheckedVarArgs, UncoveredArg,
                      IgnoreStringsWithoutSpecifiers);
    return SLCT_CheckedLiteral;
  }

  return SLCT_NotALiteral;
}
case Stmt::BinaryOperatorClass: {
  const BinaryOperator *BinOp = cast<BinaryOperator>(E);

  // A string literal + an int offset is still a string literal.
  if (BinOp->isAdditiveOp()) {
    Expr::EvalResult LResult, RResult;

    bool LIsInt = BinOp->getLHS()->EvaluateAsInt(
        LResult, S.Context, Expr::SE_NoSideEffects, S.isConstantEvaluated());
    bool RIsInt = BinOp->getRHS()->EvaluateAsInt(
        RResult, S.Context, Expr::SE_NoSideEffects, S.isConstantEvaluated());

    if (LIsInt != RIsInt) {
      BinaryOperatorKind BinOpKind = BinOp->getOpcode();

      if (LIsInt) {
        if (BinOpKind == BO_Add) {
          sumOffsets(Offset, LResult.Val.getInt(), BinOpKind, RIsInt);
          E = BinOp->getRHS();
          goto tryAgain;
        }
      } else {
        sumOffsets(Offset, RResult.Val.getInt(), BinOpKind, RIsInt);
        E = BinOp->getLHS();
        goto tryAgain;
      }
    }
  }

  return SLCT_NotALiteral;
}
case Stmt::UnaryOperatorClass: {
  const UnaryOperator *UnaOp = cast<UnaryOperator>(E);
  auto ASE = dyn_cast<ArraySubscriptExpr>(UnaOp->getSubExpr());
  if (UnaOp->getOpcode() == UO_AddrOf && ASE) {
    Expr::EvalResult IndexResult;
    if (ASE->getRHS()->EvaluateAsInt(IndexResult, S.Context,
                                     Expr::SE_NoSideEffects,
                                     S.isConstantEvaluated())) {
      sumOffsets(Offset, IndexResult.Val.getInt(), BO_Add,
                 /*RHS is int*/ true);
      E = ASE->getBase();
      goto tryAgain;
    }
  }

  return SLCT_NotALiteral;
}

default:
  return SLCT_NotALiteral;
}
7845}

7847Sema::FormatStringType Sema::GetFormatStringType(const FormatAttr *Format) {
return llvm::StringSwitch<FormatStringType>(Format->getType()->getName())
    .Case("scanf", FST_Scanf)
    .Cases("printf", "printf0", "syslog", FST_Printf)
    .Cases("NSString", "CFString", FST_NSString)
    .Case("strftime", FST_Strftime)
    .Case("strfmon", FST_Strfmon)
    .Cases("kprintf", "cmn_err", "vcmn_err", "zcmn_err", FST_Kprintf)
    .Case("freebsd_kprintf", FST_FreeBSDKPrintf)
    .Case("os_trace", FST_OSLog)
    .Case("os_log", FST_OSLog)
    .Default(FST_Unknown);
7859}

7861/// CheckFormatArguments - Check calls to printf and scanf (and similar
7862/// functions) for correct use of format strings.
7863/// Returns true if a format string has been fully checked.
7864bool Sema::CheckFormatArguments(const FormatAttr *Format,
                              ArrayRef<const Expr *> Args,
                              bool IsCXXMember,
                              VariadicCallType CallType,
                              SourceLocation Loc, SourceRange Range,
                              llvm::SmallBitVector &CheckedVarArgs) {
FormatStringInfo FSI;
if (getFormatStringInfo(Format, IsCXXMember, &FSI))
  return CheckFormatArguments(Args, FSI.HasVAListArg, FSI.FormatIdx,
                              FSI.FirstDataArg, GetFormatStringType(Format),
                              CallType, Loc, Range, CheckedVarArgs);
return false;
7876}

7878bool Sema::CheckFormatArguments(ArrayRef<const Expr *> Args,
                              bool HasVAListArg, unsigned format_idx,
                              unsigned firstDataArg, FormatStringType Type,
                              VariadicCallType CallType,
                              SourceLocation Loc, SourceRange Range,
                              llvm::SmallBitVector &CheckedVarArgs) {
// CHECK: printf/scanf-like function is called with no format string.
if (format_idx >= Args.size()) {
  Diag(Loc, diag::warn_missing_format_string) << Range;
  return false;
}

const Expr *OrigFormatExpr = Args[format_idx]->IgnoreParenCasts();

// CHECK: format string is not a string literal.
//
// Dynamically generated format strings are difficult to
// automatically vet at compile time.  Requiring that format strings
// are string literals: (1) permits the checking of format strings by
// the compiler and thereby (2) can practically remove the source of
// many format string exploits.

// Format string can be either ObjC string (e.g. @"%d") or
// C string (e.g. "%d")
// ObjC string uses the same format specifiers as C string, so we can use
// the same format string checking logic for both ObjC and C strings.
UncoveredArgHandler UncoveredArg;
StringLiteralCheckType CT =
    checkFormatStringExpr(*this, OrigFormatExpr, Args, HasVAListArg,
                          format_idx, firstDataArg, Type, CallType,
                          /*IsFunctionCall*/ true, CheckedVarArgs,
                          UncoveredArg,
                          /*no string offset*/ llvm::APSInt(64, false) = 0);

// Generate a diagnostic where an uncovered argument is detected.
if (UncoveredArg.hasUncoveredArg()) {
  unsigned ArgIdx = UncoveredArg.getUncoveredArg() + firstDataArg;
  assert(ArgIdx < Args.size() && "ArgIdx outside bounds")((void)0);
  UncoveredArg.Diagnose(*this, /*IsFunctionCall*/true, Args[ArgIdx]);
}

if (CT != SLCT_NotALiteral)
  // Literal format string found, check done!
  return CT == SLCT_CheckedLiteral;

// Strftime is particular as it always uses a single 'time' argument,
// so it is safe to pass a non-literal string.
if (Type == FST_Strftime)
  return false;

// Do not emit diag when the string param is a macro expansion and the
// format is either NSString or CFString. This is a hack to prevent
// diag when using the NSLocalizedString and CFCopyLocalizedString macros
// which are usually used in place of NS and CF string literals.
SourceLocation FormatLoc = Args[format_idx]->getBeginLoc();
if (Type == FST_NSString && SourceMgr.isInSystemMacro(FormatLoc))
  return false;

// If there are no arguments specified, warn with -Wformat-security, otherwise
// warn only with -Wformat-nonliteral.
if (Args.size() == firstDataArg) {
  Diag(FormatLoc, diag::warn_format_nonliteral_noargs)
    << OrigFormatExpr->getSourceRange();
  switch (Type) {
  default:
    break;
  case FST_Kprintf:
  case FST_FreeBSDKPrintf:
  case FST_Printf:
  case FST_Syslog:
    Diag(FormatLoc, diag::note_format_security_fixit)
      << FixItHint::CreateInsertion(FormatLoc, "\"%s\", ");
    break;
  case FST_NSString:
    Diag(FormatLoc, diag::note_format_security_fixit)
      << FixItHint::CreateInsertion(FormatLoc, "@\"%@\", ");
    break;
  }
} else {
  Diag(FormatLoc, diag::warn_format_nonliteral)
    << OrigFormatExpr->getSourceRange();
}
return false;
7961}

7963namespace {

7965class CheckFormatHandler : public analyze_format_string::FormatStringHandler {
7966protected:
Sema &S;
const FormatStringLiteral *FExpr;
const Expr *OrigFormatExpr;
const Sema::FormatStringType FSType;
const unsigned FirstDataArg;
const unsigned NumDataArgs;
const char *Beg; // Start of format string.
const bool HasVAListArg;
ArrayRef<const Expr *> Args;
unsigned FormatIdx;
llvm::SmallBitVector CoveredArgs;
bool usesPositionalArgs = false;
bool atFirstArg = true;
bool inFunctionCall;
Sema::VariadicCallType CallType;
llvm::SmallBitVector &CheckedVarArgs;
UncoveredArgHandler &UncoveredArg;

7985public:
CheckFormatHandler(Sema &s, const FormatStringLiteral *fexpr,
                   const Expr *origFormatExpr,
                   const Sema::FormatStringType type, unsigned firstDataArg,
                   unsigned numDataArgs, const char *beg, bool hasVAListArg,
                   ArrayRef<const Expr *> Args, unsigned formatIdx,
                   bool inFunctionCall, Sema::VariadicCallType callType,
                   llvm::SmallBitVector &CheckedVarArgs,
                   UncoveredArgHandler &UncoveredArg)
    : S(s), FExpr(fexpr), OrigFormatExpr(origFormatExpr), FSType(type),
      FirstDataArg(firstDataArg), NumDataArgs(numDataArgs), Beg(beg),
      HasVAListArg(hasVAListArg), Args(Args), FormatIdx(formatIdx),
      inFunctionCall(inFunctionCall), CallType(callType),
      CheckedVarArgs(CheckedVarArgs), UncoveredArg(UncoveredArg) {
  CoveredArgs.resize(numDataArgs);
  CoveredArgs.reset();
}

void DoneProcessing();

void HandleIncompleteSpecifier(const char *startSpecifier,
                               unsigned specifierLen) override;

void HandleInvalidLengthModifier(
                         const analyze_format_string::FormatSpecifier &FS,
                         const analyze_format_string::ConversionSpecifier &CS,
                         const char *startSpecifier, unsigned specifierLen,
                         unsigned DiagID);

void HandleNonStandardLengthModifier(
                  const analyze_format_string::FormatSpecifier &FS,
                  const char *startSpecifier, unsigned specifierLen);

void HandleNonStandardConversionSpecifier(
                  const analyze_format_string::ConversionSpecifier &CS,
                  const char *startSpecifier, unsigned specifierLen);

void HandlePosition(const char *startPos, unsigned posLen) override;

void HandleInvalidPosition(const char *startSpecifier,
                           unsigned specifierLen,
                           analyze_format_string::PositionContext p) override;

void HandleZeroPosition(const char *startPos, unsigned posLen) override;

void HandleNullChar(const char *nullCharacter) override;

template <typename Range>
static void
EmitFormatDiagnostic(Sema &S, bool inFunctionCall, const Expr *ArgumentExpr,
                     const PartialDiagnostic &PDiag, SourceLocation StringLoc,
                     bool IsStringLocation, Range StringRange,
                     ArrayRef<FixItHint> Fixit = None);

8039protected:
bool HandleInvalidConversionSpecifier(unsigned argIndex, SourceLocation Loc,
                                      const char *startSpec,
                                      unsigned specifierLen,
                                      const char *csStart, unsigned csLen);

void HandlePositionalNonpositionalArgs(SourceLocation Loc,
                                       const char *startSpec,
                                       unsigned specifierLen);

SourceRange getFormatStringRange();
CharSourceRange getSpecifierRange(const char *startSpecifier,
                                  unsigned specifierLen);
SourceLocation getLocationOfByte(const char *x);

const Expr *getDataArg(unsigned i) const;

bool CheckNumArgs(const analyze_format_string::FormatSpecifier &FS,
                  const analyze_format_string::ConversionSpecifier &CS,
                  const char *startSpecifier, unsigned specifierLen,
                  unsigned argIndex);

template <typename Range>
void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc,
                          bool IsStringLocation, Range StringRange,
                          ArrayRef<FixItHint> Fixit = None);
8065};

8067} // namespace

8069SourceRange CheckFormatHandler::getFormatStringRange() {
return OrigFormatExpr->getSourceRange();
8071}

8073CharSourceRange CheckFormatHandler::
8074getSpecifierRange(const char *startSpecifier, unsigned specifierLen) {
SourceLocation Start = getLocationOfByte(startSpecifier);
SourceLocation End   = getLocationOfByte(startSpecifier + specifierLen - 1);

// Advance the end SourceLocation by one due to half-open ranges.
End = End.getLocWithOffset(1);

return CharSourceRange::getCharRange(Start, End);
8082}

8084SourceLocation CheckFormatHandler::getLocationOfByte(const char *x) {
return FExpr->getLocationOfByte(x - Beg, S.getSourceManager(),
                                S.getLangOpts(), S.Context.getTargetInfo());
8087}

8089void CheckFormatHandler::HandleIncompleteSpecifier(const char *startSpecifier,
                                                 unsigned specifierLen){
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_incomplete_specifier),
                     getLocationOfByte(startSpecifier),
                     /*IsStringLocation*/true,
                     getSpecifierRange(startSpecifier, specifierLen));
8095}

8097void CheckFormatHandler::HandleInvalidLengthModifier(
  const analyze_format_string::FormatSpecifier &FS,
  const analyze_format_string::ConversionSpecifier &CS,
  const char *startSpecifier, unsigned specifierLen, unsigned DiagID) {
using namespace analyze_format_string;

const LengthModifier &LM = FS.getLengthModifier();
CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());

// See if we know how to fix this length modifier.
Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
if (FixedLM) {
  EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
                       getLocationOfByte(LM.getStart()),
                       /*IsStringLocation*/true,
                       getSpecifierRange(startSpecifier, specifierLen));

  S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
    << FixedLM->toString()
    << FixItHint::CreateReplacement(LMRange, FixedLM->toString());

} else {
  FixItHint Hint;
  if (DiagID == diag::warn_format_nonsensical_length)
    Hint = FixItHint::CreateRemoval(LMRange);

  EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
                       getLocationOfByte(LM.getStart()),
                       /*IsStringLocation*/true,
                       getSpecifierRange(startSpecifier, specifierLen),
                       Hint);
}
8129}

8131void CheckFormatHandler::HandleNonStandardLengthModifier(
  const analyze_format_string::FormatSpecifier &FS,
  const char *startSpecifier, unsigned specifierLen) {
using namespace analyze_format_string;

const LengthModifier &LM = FS.getLengthModifier();
CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());

// See if we know how to fix this length modifier.
Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
if (FixedLM) {
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                         << LM.toString() << 0,
                       getLocationOfByte(LM.getStart()),
                       /*IsStringLocation*/true,
                       getSpecifierRange(startSpecifier, specifierLen));

  S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
    << FixedLM->toString()
    << FixItHint::CreateReplacement(LMRange, FixedLM->toString());

} else {
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                         << LM.toString() << 0,
                       getLocationOfByte(LM.getStart()),
                       /*IsStringLocation*/true,
                       getSpecifierRange(startSpecifier, specifierLen));
}
8159}

8161void CheckFormatHandler::HandleNonStandardConversionSpecifier(
  const analyze_format_string::ConversionSpecifier &CS,
  const char *startSpecifier, unsigned specifierLen) {
using namespace analyze_format_string;

// See if we know how to fix this conversion specifier.
Optional<ConversionSpecifier> FixedCS = CS.getStandardSpecifier();
if (FixedCS) {
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                        << CS.toString() << /*conversion specifier*/1,
                       getLocationOfByte(CS.getStart()),
                       /*IsStringLocation*/true,
                       getSpecifierRange(startSpecifier, specifierLen));

  CharSourceRange CSRange = getSpecifierRange(CS.getStart(), CS.getLength());
  S.Diag(getLocationOfByte(CS.getStart()), diag::note_format_fix_specifier)
    << FixedCS->toString()
    << FixItHint::CreateReplacement(CSRange, FixedCS->toString());
} else {
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
                        << CS.toString() << /*conversion specifier*/1,
                       getLocationOfByte(CS.getStart()),
                       /*IsStringLocation*/true,
                       getSpecifierRange(startSpecifier, specifierLen));
}
8186}

8188void CheckFormatHandler::HandlePosition(const char *startPos,
                                      unsigned posLen) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard_positional_arg),
                             getLocationOfByte(startPos),
                             /*IsStringLocation*/true,
                             getSpecifierRange(startPos, posLen));
8194}

8196void
8197CheckFormatHandler::HandleInvalidPosition(const char *startPos, unsigned posLen,
                                   analyze_format_string::PositionContext p) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_positional_specifier)
                       << (unsigned) p,
                     getLocationOfByte(startPos), /*IsStringLocation*/true,
                     getSpecifierRange(startPos, posLen));
8203}

8205void CheckFormatHandler::HandleZeroPosition(const char *startPos,
                                          unsigned posLen) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_zero_positional_specifier),
                             getLocationOfByte(startPos),
                             /*IsStringLocation*/true,
                             getSpecifierRange(startPos, posLen));
8211}

8213void CheckFormatHandler::HandleNullChar(const char *nullCharacter) {
if (!isa<ObjCStringLiteral>(OrigFormatExpr)) {
  // The presence of a null character is likely an error.
  EmitFormatDiagnostic(
    S.PDiag(diag::warn_printf_format_string_contains_null_char),
    getLocationOfByte(nullCharacter), /*IsStringLocation*/true,
    getFormatStringRange());
}
8221}

8223// Note that this may return NULL if there was an error parsing or building
8224// one of the argument expressions.
8225const Expr *CheckFormatHandler::getDataArg(unsigned i) const {
return Args[FirstDataArg + i];
8227}

8229void CheckFormatHandler::DoneProcessing() {
// Does the number of data arguments exceed the number of
// format conversions in the format string?
if (!HasVAListArg) {
    // Find any arguments that weren't covered.
  CoveredArgs.flip();
  signed notCoveredArg = CoveredArgs.find_first();
  if (notCoveredArg >= 0) {
    assert((unsigned)notCoveredArg < NumDataArgs)((void)0);
    UncoveredArg.Update(notCoveredArg, OrigFormatExpr);
  } else {
    UncoveredArg.setAllCovered();
  }
}
8243}

8245void UncoveredArgHandler::Diagnose(Sema &S, bool IsFunctionCall,
                                 const Expr *ArgExpr) {
assert(hasUncoveredArg() && DiagnosticExprs.size() > 0 &&((void)0)
       "Invalid state")((void)0);

if (!ArgExpr)
  return;

SourceLocation Loc = ArgExpr->getBeginLoc();

if (S.getSourceManager().isInSystemMacro(Loc))
  return;

PartialDiagnostic PDiag = S.PDiag(diag::warn_printf_data_arg_not_used);
for (auto E : DiagnosticExprs)
  PDiag << E->getSourceRange();

CheckFormatHandler::EmitFormatDiagnostic(
                                S, IsFunctionCall, DiagnosticExprs[0],
                                PDiag, Loc, /*IsStringLocation*/false,
                                DiagnosticExprs[0]->getSourceRange());
8266}

8268bool
8269CheckFormatHandler::HandleInvalidConversionSpecifier(unsigned argIndex,
                                                   SourceLocation Loc,
                                                   const char *startSpec,
                                                   unsigned specifierLen,
                                                   const char *csStart,
                                                   unsigned csLen) {
bool keepGoing = true;
if (argIndex < NumDataArgs) {
  // Consider the argument coverered, even though the specifier doesn't
  // make sense.
  CoveredArgs.set(argIndex);
}
else {
  // If argIndex exceeds the number of data arguments we
  // don't issue a warning because that is just a cascade of warnings (and
  // they may have intended '%%' anyway). We don't want to continue processing
  // the format string after this point, however, as we will like just get
  // gibberish when trying to match arguments.
  keepGoing = false;
}

StringRef Specifier(csStart, csLen);

// If the specifier in non-printable, it could be the first byte of a UTF-8
// sequence. In that case, print the UTF-8 code point. If not, print the byte
// hex value.
std::string CodePointStr;
if (!llvm::sys::locale::isPrint(*csStart)) {
  llvm::UTF32 CodePoint;
  const llvm::UTF8 **B = reinterpret_cast<const llvm::UTF8 **>(&csStart);
  const llvm::UTF8 *E =
      reinterpret_cast<const llvm::UTF8 *>(csStart + csLen);
  llvm::ConversionResult Result =
      llvm::convertUTF8Sequence(B, E, &CodePoint, llvm::strictConversion);

  if (Result != llvm::conversionOK) {
    unsigned char FirstChar = *csStart;
    CodePoint = (llvm::UTF32)FirstChar;
  }

  llvm::raw_string_ostream OS(CodePointStr);
  if (CodePoint < 256)
    OS << "\\x" << llvm::format("%02x", CodePoint);
  else if (CodePoint <= 0xFFFF)
    OS << "\\u" << llvm::format("%04x", CodePoint);
  else
    OS << "\\U" << llvm::format("%08x", CodePoint);
  OS.flush();
  Specifier = CodePointStr;
}

EmitFormatDiagnostic(
    S.PDiag(diag::warn_format_invalid_conversion) << Specifier, Loc,
    /*IsStringLocation*/ true, getSpecifierRange(startSpec, specifierLen));

return keepGoing;
8325}

8327void
8328CheckFormatHandler::HandlePositionalNonpositionalArgs(SourceLocation Loc,
                                                    const char *startSpec,
                                                    unsigned specifierLen) {
EmitFormatDiagnostic(
  S.PDiag(diag::warn_format_mix_positional_nonpositional_args),
  Loc, /*isStringLoc*/true, getSpecifierRange(startSpec, specifierLen));
8334}

8336bool
8337CheckFormatHandler::CheckNumArgs(
const analyze_format_string::FormatSpecifier &FS,
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen, unsigned argIndex) {

if (argIndex >= NumDataArgs) {
  PartialDiagnostic PDiag = FS.usesPositionalArg()
    ? (S.PDiag(diag::warn_printf_positional_arg_exceeds_data_args)
         << (argIndex+1) << NumDataArgs)
    : S.PDiag(diag::warn_printf_insufficient_data_args);
  EmitFormatDiagnostic(
    PDiag, getLocationOfByte(CS.getStart()), /*IsStringLocation*/true,
    getSpecifierRange(startSpecifier, specifierLen));

  // Since more arguments than conversion tokens are given, by extension
  // all arguments are covered, so mark this as so.
  UncoveredArg.setAllCovered();
  return false;
}
return true;
8357}

8359template<typename Range>
8360void CheckFormatHandler::EmitFormatDiagnostic(PartialDiagnostic PDiag,
                                            SourceLocation Loc,
                                            bool IsStringLocation,
                                            Range StringRange,
                                            ArrayRef<FixItHint> FixIt) {
EmitFormatDiagnostic(S, inFunctionCall, Args[FormatIdx], PDiag,
                     Loc, IsStringLocation, StringRange, FixIt);
8367}

8369/// If the format string is not within the function call, emit a note
8370/// so that the function call and string are in diagnostic messages.
8371///
8372/// \param InFunctionCall if true, the format string is within the function
8373/// call and only one diagnostic message will be produced.  Otherwise, an
8374/// extra note will be emitted pointing to location of the format string.
8375///
8376/// \param ArgumentExpr the expression that is passed as the format string
8377/// argument in the function call.  Used for getting locations when two
8378/// diagnostics are emitted.
8379///
8380/// \param PDiag the callee should already have provided any strings for the
8381/// diagnostic message.  This function only adds locations and fixits
8382/// to diagnostics.
8383///
8384/// \param Loc primary location for diagnostic.  If two diagnostics are
8385/// required, one will be at Loc and a new SourceLocation will be created for
8386/// the other one.
8387///
8388/// \param IsStringLocation if true, Loc points to the format string should be
8389/// used for the note.  Otherwise, Loc points to the argument list and will
8390/// be used with PDiag.
8391///
8392/// \param StringRange some or all of the string to highlight.  This is
8393/// templated so it can accept either a CharSourceRange or a SourceRange.
8394///
8395/// \param FixIt optional fix it hint for the format string.
8396template <typename Range>
8397void CheckFormatHandler::EmitFormatDiagnostic(
  Sema &S, bool InFunctionCall, const Expr *ArgumentExpr,
  const PartialDiagnostic &PDiag, SourceLocation Loc, bool IsStringLocation,
  Range StringRange, ArrayRef<FixItHint> FixIt) {
if (InFunctionCall) {
  const Sema::SemaDiagnosticBuilder &D = S.Diag(Loc, PDiag);
  D << StringRange;
  D << FixIt;
} else {
  S.Diag(IsStringLocation ? ArgumentExpr->getExprLoc() : Loc, PDiag)
    << ArgumentExpr->getSourceRange();

  const Sema::SemaDiagnosticBuilder &Note =
    S.Diag(IsStringLocation ? Loc : StringRange.getBegin(),
           diag::note_format_string_defined);

  Note << StringRange;
  Note << FixIt;
}
8416}

8418//===--- CHECK: Printf format string checking ------------------------------===//

8420namespace {

8422class CheckPrintfHandler : public CheckFormatHandler {
8423public:
CheckPrintfHandler(Sema &s, const FormatStringLiteral *fexpr,
                   const Expr *origFormatExpr,
                   const Sema::FormatStringType type, unsigned firstDataArg,
                   unsigned numDataArgs, bool isObjC, const char *beg,
                   bool hasVAListArg, ArrayRef<const Expr *> Args,
                   unsigned formatIdx, bool inFunctionCall,
                   Sema::VariadicCallType CallType,
                   llvm::SmallBitVector &CheckedVarArgs,
                   UncoveredArgHandler &UncoveredArg)
    : CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
                         numDataArgs, beg, hasVAListArg, Args, formatIdx,
                         inFunctionCall, CallType, CheckedVarArgs,
                         UncoveredArg) {}

bool isObjCContext() const { return FSType == Sema::FST_NSString; }

/// Returns true if '%@' specifiers are allowed in the format string.
bool allowsObjCArg() const {
  return FSType == Sema::FST_NSString || FSType == Sema::FST_OSLog ||
         FSType == Sema::FST_OSTrace;
}

bool HandleInvalidPrintfConversionSpecifier(
                                    const analyze_printf::PrintfSpecifier &FS,
                                    const char *startSpecifier,
                                    unsigned specifierLen) override;

void handleInvalidMaskType(StringRef MaskType) override;

bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
                           const char *startSpecifier,
                           unsigned specifierLen) override;
bool checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
                     const char *StartSpecifier,
                     unsigned SpecifierLen,
                     const Expr *E);

bool HandleAmount(const analyze_format_string::OptionalAmount &Amt, unsigned k,
                  const char *startSpecifier, unsigned specifierLen);
void HandleInvalidAmount(const analyze_printf::PrintfSpecifier &FS,
                         const analyze_printf::OptionalAmount &Amt,
                         unsigned type,
                         const char *startSpecifier, unsigned specifierLen);
void HandleFlag(const analyze_printf::PrintfSpecifier &FS,
                const analyze_printf::OptionalFlag &flag,
                const char *startSpecifier, unsigned specifierLen);
void HandleIgnoredFlag(const analyze_printf::PrintfSpecifier &FS,
                       const analyze_printf::OptionalFlag &ignoredFlag,
                       const analyze_printf::OptionalFlag &flag,
                       const char *startSpecifier, unsigned specifierLen);
bool checkForCStrMembers(const analyze_printf::ArgType &AT,
                         const Expr *E);

void HandleEmptyObjCModifierFlag(const char *startFlag,
                                 unsigned flagLen) override;

void HandleInvalidObjCModifierFlag(const char *startFlag,
                                          unsigned flagLen) override;

void HandleObjCFlagsWithNonObjCConversion(const char *flagsStart,
                                         const char *flagsEnd,
                                         const char *conversionPosition)
                                           override;
8487};

8489} // namespace

8491bool CheckPrintfHandler::HandleInvalidPrintfConversionSpecifier(
                                    const analyze_printf::PrintfSpecifier &FS,
                                    const char *startSpecifier,
                                    unsigned specifierLen) {
const analyze_printf::PrintfConversionSpecifier &CS =
  FS.getConversionSpecifier();

return HandleInvalidConversionSpecifier(FS.getArgIndex(),
                                        getLocationOfByte(CS.getStart()),
                                        startSpecifier, specifierLen,
                                        CS.getStart(), CS.getLength());
8502}

8504void CheckPrintfHandler::handleInvalidMaskType(StringRef MaskType) {
S.Diag(getLocationOfByte(MaskType.data()), diag::err_invalid_mask_type_size);
8506}

8508bool CheckPrintfHandler::HandleAmount(
                             const analyze_format_string::OptionalAmount &Amt,
                             unsigned k, const char *startSpecifier,
                             unsigned specifierLen) {
if (Amt.hasDataArgument()) {
  if (!HasVAListArg) {
    unsigned argIndex = Amt.getArgIndex();
    if (argIndex >= NumDataArgs) {
      EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_missing_arg)
                             << k,
                           getLocationOfByte(Amt.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
      // Don't do any more checking.  We will just emit
      // spurious errors.
      return false;
    }

    // Type check the data argument.  It should be an 'int'.
    // Although not in conformance with C99, we also allow the argument to be
    // an 'unsigned int' as that is a reasonably safe case.  GCC also
    // doesn't emit a warning for that case.
    CoveredArgs.set(argIndex);
    const Expr *Arg = getDataArg(argIndex);
    if (!Arg)
      return false;

    QualType T = Arg->getType();

    const analyze_printf::ArgType &AT = Amt.getArgType(S.Context);
    assert(AT.isValid())((void)0);

    if (!AT.matchesType(S.Context, T)) {
      EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_wrong_type)
                             << k << AT.getRepresentativeTypeName(S.Context)
                             << T << Arg->getSourceRange(),
                           getLocationOfByte(Amt.getStart()),
                           /*IsStringLocation*/true,
                           getSpecifierRange(startSpecifier, specifierLen));
      // Don't do any more checking.  We will just emit
      // spurious errors.
      return false;
    }
  }
}
return true;
8554}

8556void CheckPrintfHandler::HandleInvalidAmount(
                                    const analyze_printf::PrintfSpecifier &FS,
                                    const analyze_printf::OptionalAmount &Amt,
                                    unsigned type,
                                    const char *startSpecifier,
                                    unsigned specifierLen) {
const analyze_printf::PrintfConversionSpecifier &CS =
  FS.getConversionSpecifier();

FixItHint fixit =
  Amt.getHowSpecified() == analyze_printf::OptionalAmount::Constant
    ? FixItHint::CreateRemoval(getSpecifierRange(Amt.getStart(),
                               Amt.getConstantLength()))
    : FixItHint();

EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_optional_amount)
                       << type << CS.toString(),
                     getLocationOfByte(Amt.getStart()),
                     /*IsStringLocation*/true,
                     getSpecifierRange(startSpecifier, specifierLen),
                     fixit);
8577}

8579void CheckPrintfHandler::HandleFlag(const analyze_printf::PrintfSpecifier &FS,
                                  const analyze_printf::OptionalFlag &flag,
                                  const char *startSpecifier,
                                  unsigned specifierLen) {
// Warn about pointless flag with a fixit removal.
const analyze_printf::PrintfConversionSpecifier &CS =
  FS.getConversionSpecifier();
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_flag)
                       << flag.toString() << CS.toString(),
                     getLocationOfByte(flag.getPosition()),
                     /*IsStringLocation*/true,
                     getSpecifierRange(startSpecifier, specifierLen),
                     FixItHint::CreateRemoval(
                       getSpecifierRange(flag.getPosition(), 1)));
8593}

8595void CheckPrintfHandler::HandleIgnoredFlag(
                              const analyze_printf::PrintfSpecifier &FS,
                              const analyze_printf::OptionalFlag &ignoredFlag,
                              const analyze_printf::OptionalFlag &flag,
                              const char *startSpecifier,
                              unsigned specifierLen) {
// Warn about ignored flag with a fixit removal.
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_ignored_flag)
                       << ignoredFlag.toString() << flag.toString(),
                     getLocationOfByte(ignoredFlag.getPosition()),
                     /*IsStringLocation*/true,
                     getSpecifierRange(startSpecifier, specifierLen),
                     FixItHint::CreateRemoval(
                       getSpecifierRange(ignoredFlag.getPosition(), 1)));
8609}

8611void CheckPrintfHandler::HandleEmptyObjCModifierFlag(const char *startFlag,
                                                   unsigned flagLen) {
// Warn about an empty flag.
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_empty_objc_flag),
                     getLocationOfByte(startFlag),
                     /*IsStringLocation*/true,
                     getSpecifierRange(startFlag, flagLen));
8618}

8620void CheckPrintfHandler::HandleInvalidObjCModifierFlag(const char *startFlag,
                                                     unsigned flagLen) {
// Warn about an invalid flag.
auto Range = getSpecifierRange(startFlag, flagLen);
StringRef flag(startFlag, flagLen);
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_invalid_objc_flag) << flag,
                    getLocationOfByte(startFlag),
                    /*IsStringLocation*/true,
                    Range, FixItHint::CreateRemoval(Range));
8629}

8631void CheckPrintfHandler::HandleObjCFlagsWithNonObjCConversion(
  const char *flagsStart, const char *flagsEnd, const char *conversionPosition) {
  // Warn about using '[...]' without a '@' conversion.
  auto Range = getSpecifierRange(flagsStart, flagsEnd - flagsStart + 1);
  auto diag = diag::warn_printf_ObjCflags_without_ObjCConversion;
  EmitFormatDiagnostic(S.PDiag(diag) << StringRef(conversionPosition, 1),
                       getLocationOfByte(conversionPosition),
                       /*IsStringLocation*/true,
                       Range, FixItHint::CreateRemoval(Range));
8640}

8642// Determines if the specified is a C++ class or struct containing
8643// a member with the specified name and kind (e.g. a CXXMethodDecl named
8644// "c_str()").
8645template<typename MemberKind>
8646static llvm::SmallPtrSet<MemberKind*, 1>
8647CXXRecordMembersNamed(StringRef Name, Sema &S, QualType Ty) {
const RecordType *RT = Ty->getAs<RecordType>();
llvm::SmallPtrSet<MemberKind*, 1> Results;

if (!RT)
  return Results;
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
if (!RD || !RD->getDefinition())
  return Results;

LookupResult R(S, &S.Context.Idents.get(Name), SourceLocation(),
               Sema::LookupMemberName);
R.suppressDiagnostics();

// We just need to include all members of the right kind turned up by the
// filter, at this point.
if (S.LookupQualifiedName(R, RT->getDecl()))
  for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
    NamedDecl *decl = (*I)->getUnderlyingDecl();
    if (MemberKind *FK = dyn_cast<MemberKind>(decl))
      Results.insert(FK);
  }
return Results;
8670}

8672/// Check if we could call '.c_str()' on an object.
8673///
8674/// FIXME: This returns the wrong results in some cases (if cv-qualifiers don't
8675/// allow the call, or if it would be ambiguous).
8676bool Sema::hasCStrMethod(const Expr *E) {
using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;

MethodSet Results =
    CXXRecordMembersNamed<CXXMethodDecl>("c_str", *this, E->getType());
for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
     MI != ME; ++MI)
  if ((*MI)->getMinRequiredArguments() == 0)
    return true;
return false;
8686}

8688// Check if a (w)string was passed when a (w)char* was needed, and offer a
8689// better diagnostic if so. AT is assumed to be valid.
8690// Returns true when a c_str() conversion method is found.
8691bool CheckPrintfHandler::checkForCStrMembers(
  const analyze_printf::ArgType &AT, const Expr *E) {
using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;

MethodSet Results =
    CXXRecordMembersNamed<CXXMethodDecl>("c_str", S, E->getType());

for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
     MI != ME; ++MI) {
  const CXXMethodDecl *Method = *MI;
  if (Method->getMinRequiredArguments() == 0 &&
      AT.matchesType(S.Context, Method->getReturnType())) {
    // FIXME: Suggest parens if the expression needs them.
    SourceLocation EndLoc = S.getLocForEndOfToken(E->getEndLoc());
    S.Diag(E->getBeginLoc(), diag::note_printf_c_str)
        << "c_str()" << FixItHint::CreateInsertion(EndLoc, ".c_str()");
    return true;
  }
}

return false;
8712}

8714bool
8715CheckPrintfHandler::HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier
                                          &FS,
                                        const char *startSpecifier,
                                        unsigned specifierLen) {
using namespace analyze_format_string;
using namespace analyze_printf;

const PrintfConversionSpecifier &CS = FS.getConversionSpecifier();

if (FS.consumesDataArgument()) {
  if (atFirstArg) {
      atFirstArg = false;
      usesPositionalArgs = FS.usesPositionalArg();
  }
  else if (usesPositionalArgs != FS.usesPositionalArg()) {
    HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
                                      startSpecifier, specifierLen);
    return false;
  }
}

// First check if the field width, precision, and conversion specifier
// have matching data arguments.
if (!HandleAmount(FS.getFieldWidth(), /* field width */ 0,
                  startSpecifier, specifierLen)) {
  return false;
}

if (!HandleAmount(FS.getPrecision(), /* precision */ 1,
                  startSpecifier, specifierLen)) {
  return false;
}

if (!CS.consumesDataArgument()) {
  // FIXME: Technically specifying a precision or field width here
  // makes no sense.  Worth issuing a warning at some point.
  return true;
}

// Consume the argument.
unsigned argIndex = FS.getArgIndex();
if (argIndex < NumDataArgs) {
  // The check to see if the argIndex is valid will come later.
  // We set the bit here because we may exit early from this
  // function if we encounter some other error.
  CoveredArgs.set(argIndex);
}

// FreeBSD kernel extensions.
if (CS.getKind() == ConversionSpecifier::FreeBSDbArg ||
    CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
  // We need at least two arguments.
  if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex + 1))
    return false;

  // Claim the second argument.
  CoveredArgs.set(argIndex + 1);

  const Expr *Ex = getDataArg(argIndex);
  if (CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
    // Type check the first argument (pointer for %D)
    const analyze_printf::ArgType &AT = ArgType::CPointerTy;
    if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
      EmitFormatDiagnostic(
        S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
        << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
        << false << Ex->getSourceRange(),
        Ex->getBeginLoc(), /*IsStringLocation*/false,
        getSpecifierRange(startSpecifier, specifierLen));
  } else {
    // Check the length modifier for %b
    if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
                                   S.getLangOpts()))
      HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                                  diag::warn_format_nonsensical_length);
    else if (!FS.hasStandardLengthModifier())
      HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
    else if (!FS.hasStandardLengthConversionCombination())
      HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                                  diag::warn_format_non_standard_conversion_spec);

    // Type check the first argument of %b
    if (!checkFormatExpr(FS, startSpecifier, specifierLen, Ex))
      return false;
  }

  // Type check the second argument (char * for both %b and %D)
  Ex = getDataArg(argIndex + 1);
  const analyze_printf::ArgType &AT2 = ArgType::CStrTy;
  if (AT2.isValid() && !AT2.matchesType(S.Context, Ex->getType()))
    EmitFormatDiagnostic(
        S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
            << AT2.getRepresentativeTypeName(S.Context) << Ex->getType()
            << false << Ex->getSourceRange(),
        Ex->getBeginLoc(), /*IsStringLocation*/ false,
        getSpecifierRange(startSpecifier, specifierLen));

   return true;
}

// Check for using an Objective-C specific conversion specifier
// in a non-ObjC literal.
if (!allowsObjCArg() && CS.isObjCArg()) {
  return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
                                                specifierLen);
}

// %P can only be used with os_log.
if (FSType != Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::PArg) {
  return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
                                                specifierLen);
}

// %n is not allowed with os_log.
if (FSType == Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::nArg) {
  EmitFormatDiagnostic(S.PDiag(diag::warn_os_log_format_narg),
                       getLocationOfByte(CS.getStart()),
                       /*IsStringLocation*/ false,
                       getSpecifierRange(startSpecifier, specifierLen));

  return true;
}

// %n is not allowed anywhere
if (CS.getKind() == ConversionSpecifier::nArg) {
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_narg),
                       getLocationOfByte(CS.getStart()),
                       /*IsStringLocation*/ false,
                       getSpecifierRange(startSpecifier, specifierLen));
  return true;
}

// Only scalars are allowed for os_trace.
if (FSType == Sema::FST_OSTrace &&
    (CS.getKind() == ConversionSpecifier::PArg ||
     CS.getKind() == ConversionSpecifier::sArg ||
     CS.getKind() == ConversionSpecifier::ObjCObjArg)) {
  return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
                                                specifierLen);
}

// Check for use of public/private annotation outside of os_log().
if (FSType != Sema::FST_OSLog) {
  if (FS.isPublic().isSet()) {
    EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
                             << "public",
                         getLocationOfByte(FS.isPublic().getPosition()),
                         /*IsStringLocation*/ false,
                         getSpecifierRange(startSpecifier, specifierLen));
  }
  if (FS.isPrivate().isSet()) {
    EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
                             << "private",
                         getLocationOfByte(FS.isPrivate().getPosition()),
                         /*IsStringLocation*/ false,
                         getSpecifierRange(startSpecifier, specifierLen));
  }
}

// Check for invalid use of field width
if (!FS.hasValidFieldWidth()) {
  HandleInvalidAmount(FS, FS.getFieldWidth(), /* field width */ 0,
      startSpecifier, specifierLen);
}

// Check for invalid use of precision
if (!FS.hasValidPrecision()) {
  HandleInvalidAmount(FS, FS.getPrecision(), /* precision */ 1,
      startSpecifier, specifierLen);
}

// Precision is mandatory for %P specifier.
if (CS.getKind() == ConversionSpecifier::PArg &&
    FS.getPrecision().getHowSpecified() == OptionalAmount::NotSpecified) {
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_P_no_precision),
                       getLocationOfByte(startSpecifier),
                       /*IsStringLocation*/ false,
                       getSpecifierRange(startSpecifier, specifierLen));
}

// Check each flag does not conflict with any other component.
if (!FS.hasValidThousandsGroupingPrefix())
  HandleFlag(FS, FS.hasThousandsGrouping(), startSpecifier, specifierLen);
if (!FS.hasValidLeadingZeros())
  HandleFlag(FS, FS.hasLeadingZeros(), startSpecifier, specifierLen);
if (!FS.hasValidPlusPrefix())
  HandleFlag(FS, FS.hasPlusPrefix(), startSpecifier, specifierLen);
if (!FS.hasValidSpacePrefix())
  HandleFlag(FS, FS.hasSpacePrefix(), startSpecifier, specifierLen);
if (!FS.hasValidAlternativeForm())
  HandleFlag(FS, FS.hasAlternativeForm(), startSpecifier, specifierLen);
if (!FS.hasValidLeftJustified())
  HandleFlag(FS, FS.isLeftJustified(), startSpecifier, specifierLen);

// Check that flags are not ignored by another flag
if (FS.hasSpacePrefix() && FS.hasPlusPrefix()) // ' ' ignored by '+'
  HandleIgnoredFlag(FS, FS.hasSpacePrefix(), FS.hasPlusPrefix(),
      startSpecifier, specifierLen);
if (FS.hasLeadingZeros() && FS.isLeftJustified()) // '0' ignored by '-'
  HandleIgnoredFlag(FS, FS.hasLeadingZeros(), FS.isLeftJustified(),
          startSpecifier, specifierLen);

// Check the length modifier is valid with the given conversion specifier.
if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
                               S.getLangOpts()))
  HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                              diag::warn_format_nonsensical_length);
else if (!FS.hasStandardLengthModifier())
  HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
else if (!FS.hasStandardLengthConversionCombination())
  HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                              diag::warn_format_non_standard_conversion_spec);

if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
  HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);

// The remaining checks depend on the data arguments.
if (HasVAListArg)
  return true;

if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
  return false;

const Expr *Arg = getDataArg(argIndex);
if (!Arg)
  return true;

return checkFormatExpr(FS, startSpecifier, specifierLen, Arg);
8943}

8945static bool requiresParensToAddCast(const Expr *E) {
// FIXME: We should have a general way to reason about operator
// precedence and whether parens are actually needed here.
// Take care of a few common cases where they aren't.
const Expr *Inside = E->IgnoreImpCasts();
if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(Inside))
  Inside = POE->getSyntacticForm()->IgnoreImpCasts();

switch (Inside->getStmtClass()) {
case Stmt::ArraySubscriptExprClass:
case Stmt::CallExprClass:
case Stmt::CharacterLiteralClass:
case Stmt::CXXBoolLiteralExprClass:
case Stmt::DeclRefExprClass:
case Stmt::FloatingLiteralClass:
case Stmt::IntegerLiteralClass:
case Stmt::MemberExprClass:
case Stmt::ObjCArrayLiteralClass:
case Stmt::ObjCBoolLiteralExprClass:
case Stmt::ObjCBoxedExprClass:
case Stmt::ObjCDictionaryLiteralClass:
case Stmt::ObjCEncodeExprClass:
case Stmt::ObjCIvarRefExprClass:
case Stmt::ObjCMessageExprClass:
case Stmt::ObjCPropertyRefExprClass:
case Stmt::ObjCStringLiteralClass:
case Stmt::ObjCSubscriptRefExprClass:
case Stmt::ParenExprClass:
case Stmt::StringLiteralClass:
case Stmt::UnaryOperatorClass:
  return false;
default:
  return true;
}
8979}

8981static std::pair<QualType, StringRef>
8982shouldNotPrintDirectly(const ASTContext &Context,
                     QualType IntendedTy,
                     const Expr *E) {
// Use a 'while' to peel off layers of typedefs.
QualType TyTy = IntendedTy;
while (const TypedefType *UserTy = TyTy->getAs<TypedefType>()) {
  StringRef Name = UserTy->getDecl()->getName();
  QualType CastTy = llvm::StringSwitch<QualType>(Name)
    .Case("CFIndex", Context.getNSIntegerType())
    .Case("NSInteger", Context.getNSIntegerType())
    .Case("NSUInteger", Context.getNSUIntegerType())
    .Case("SInt32", Context.IntTy)
    .Case("UInt32", Context.UnsignedIntTy)
    .Default(QualType());

  if (!CastTy.isNull())
    return std::make_pair(CastTy, Name);

  TyTy = UserTy->desugar();
}

// Strip parens if necessary.
if (const ParenExpr *PE = dyn_cast<ParenExpr>(E))
  return shouldNotPrintDirectly(Context,
                                PE->getSubExpr()->getType(),
                                PE->getSubExpr());

// If this is a conditional expression, then its result type is constructed
// via usual arithmetic conversions and thus there might be no necessary
// typedef sugar there.  Recurse to operands to check for NSInteger &
// Co. usage condition.
if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
  QualType TrueTy, FalseTy;
  StringRef TrueName, FalseName;

  std::tie(TrueTy, TrueName) =
    shouldNotPrintDirectly(Context,
                           CO->getTrueExpr()->getType(),
                           CO->getTrueExpr());
  std::tie(FalseTy, FalseName) =
    shouldNotPrintDirectly(Context,
                           CO->getFalseExpr()->getType(),
                           CO->getFalseExpr());

  if (TrueTy == FalseTy)
    return std::make_pair(TrueTy, TrueName);
  else if (TrueTy.isNull())
    return std::make_pair(FalseTy, FalseName);
  else if (FalseTy.isNull())
    return std::make_pair(TrueTy, TrueName);
}

return std::make_pair(QualType(), StringRef());
9035}

9037/// Return true if \p ICE is an implicit argument promotion of an arithmetic
9038/// type. Bit-field 'promotions' from a higher ranked type to a lower ranked
9039/// type do not count.
9040static bool
9041isArithmeticArgumentPromotion(Sema &S, const ImplicitCastExpr *ICE) {
QualType From = ICE->getSubExpr()->getType();
QualType To = ICE->getType();
// It's an integer promotion if the destination type is the promoted
// source type.
if (ICE->getCastKind() == CK_IntegralCast &&
    From->isPromotableIntegerType() &&
    S.Context.getPromotedIntegerType(From) == To)
  return true;
// Look through vector types, since we do default argument promotion for
// those in OpenCL.
if (const auto *VecTy = From->getAs<ExtVectorType>())
  From = VecTy->getElementType();
if (const auto *VecTy = To->getAs<ExtVectorType>())
  To = VecTy->getElementType();
// It's a floating promotion if the source type is a lower rank.
return ICE->getCastKind() == CK_FloatingCast &&
       S.Context.getFloatingTypeOrder(From, To) < 0;
9059}

9061bool
9062CheckPrintfHandler::checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
                                  const char *StartSpecifier,
                                  unsigned SpecifierLen,
                                  const Expr *E) {
using namespace analyze_format_string;
using namespace analyze_printf;

// Now type check the data expression that matches the
// format specifier.
const analyze_printf::ArgType &AT = FS.getArgType(S.Context, isObjCContext());
if (!AT.isValid())
  return true;

QualType ExprTy = E->getType();
while (const TypeOfExprType *TET = dyn_cast<TypeOfExprType>(ExprTy)) {
  ExprTy = TET->getUnderlyingExpr()->getType();
}

// Diagnose attempts to print a boolean value as a character. Unlike other
// -Wformat diagnostics, this is fine from a type perspective, but it still
// doesn't make sense.
if (FS.getConversionSpecifier().getKind() == ConversionSpecifier::cArg &&
    E->isKnownToHaveBooleanValue()) {
  const CharSourceRange &CSR =
      getSpecifierRange(StartSpecifier, SpecifierLen);
  SmallString<4> FSString;
  llvm::raw_svector_ostream os(FSString);
  FS.toString(os);
  EmitFormatDiagnostic(S.PDiag(diag::warn_format_bool_as_character)
                           << FSString,
                       E->getExprLoc(), false, CSR);
  return true;
}

analyze_printf::ArgType::MatchKind Match = AT.matchesType(S.Context, ExprTy);
if (Match == analyze_printf::ArgType::Match)
  return true;

// Look through argument promotions for our error message's reported type.
// This includes the integral and floating promotions, but excludes array
// and function pointer decay (seeing that an argument intended to be a
// string has type 'char [6]' is probably more confusing than 'char *') and
// certain bitfield promotions (bitfields can be 'demoted' to a lesser type).
if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
  if (isArithmeticArgumentPromotion(S, ICE)) {
    E = ICE->getSubExpr();
    ExprTy = E->getType();

    // Check if we didn't match because of an implicit cast from a 'char'
    // or 'short' to an 'int'.  This is done because printf is a varargs
    // function.
    if (ICE->getType() == S.Context.IntTy ||
        ICE->getType() == S.Context.UnsignedIntTy) {
      // All further checking is done on the subexpression
      const analyze_printf::ArgType::MatchKind ImplicitMatch =
          AT.matchesType(S.Context, ExprTy);
      if (ImplicitMatch == analyze_printf::ArgType::Match)
        return true;
      if (ImplicitMatch == ArgType::NoMatchPedantic ||
          ImplicitMatch == ArgType::NoMatchTypeConfusion)
        Match = ImplicitMatch;
    }
  }
} else if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) {
  // Special case for 'a', which has type 'int' in C.
  // Note, however, that we do /not/ want to treat multibyte constants like
  // 'MooV' as characters! This form is deprecated but still exists. In
  // addition, don't treat expressions as of type 'char' if one byte length
  // modifier is provided.
  if (ExprTy == S.Context.IntTy &&
      FS.getLengthModifier().getKind() != LengthModifier::AsChar)
    if (llvm::isUIntN(S.Context.getCharWidth(), CL->getValue()))
      ExprTy = S.Context.CharTy;
}

// Look through enums to their underlying type.
bool IsEnum = false;
if (auto EnumTy = ExprTy->getAs<EnumType>()) {
  ExprTy = EnumTy->getDecl()->getIntegerType();
  IsEnum = true;
}

// %C in an Objective-C context prints a unichar, not a wchar_t.
// If the argument is an integer of some kind, believe the %C and suggest
// a cast instead of changing the conversion specifier.
QualType IntendedTy = ExprTy;
if (isObjCContext() &&
    FS.getConversionSpecifier().getKind() == ConversionSpecifier::CArg) {
  if (ExprTy->isIntegralOrUnscopedEnumerationType() &&
      !ExprTy->isCharType()) {
    // 'unichar' is defined as a typedef of unsigned short, but we should
    // prefer using the typedef if it is visible.
    IntendedTy = S.Context.UnsignedShortTy;

    // While we are here, check if the value is an IntegerLiteral that happens
    // to be within the valid range.
    if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) {
      const llvm::APInt &V = IL->getValue();
      if (V.getActiveBits() <= S.Context.getTypeSize(IntendedTy))
        return true;
    }

    LookupResult Result(S, &S.Context.Idents.get("unichar"), E->getBeginLoc(),
                        Sema::LookupOrdinaryName);
    if (S.LookupName(Result, S.getCurScope())) {
      NamedDecl *ND = Result.getFoundDecl();
      if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND))
        if (TD->getUnderlyingType() == IntendedTy)
          IntendedTy = S.Context.getTypedefType(TD);
    }
  }
}

// Special-case some of Darwin's platform-independence types by suggesting
// casts to primitive types that are known to be large enough.
bool ShouldNotPrintDirectly = false; StringRef CastTyName;
if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
  QualType CastTy;
  std::tie(CastTy, CastTyName) = shouldNotPrintDirectly(S.Context, IntendedTy, E);
  if (!CastTy.isNull()) {
    // %zi/%zu and %td/%tu are OK to use for NSInteger/NSUInteger of type int
    // (long in ASTContext). Only complain to pedants.
    if ((CastTyName == "NSInteger" || CastTyName == "NSUInteger") &&
        (AT.isSizeT() || AT.isPtrdiffT()) &&
        AT.matchesType(S.Context, CastTy))
      Match = ArgType::NoMatchPedantic;
    IntendedTy = CastTy;
    ShouldNotPrintDirectly = true;
  }
}

// We may be able to offer a FixItHint if it is a supported type.
PrintfSpecifier fixedFS = FS;
bool Success =
    fixedFS.fixType(IntendedTy, S.getLangOpts(), S.Context, isObjCContext());

if (Success) {
  // Get the fix string from the fixed format specifier
  SmallString<16> buf;
  llvm::raw_svector_ostream os(buf);
  fixedFS.toString(os);

  CharSourceRange SpecRange = getSpecifierRange(StartSpecifier, SpecifierLen);

  if (IntendedTy == ExprTy && !ShouldNotPrintDirectly) {
    unsigned Diag;
    switch (Match) {
    case ArgType::Match: llvm_unreachable("expected non-matching")__builtin_unreachable();
    case ArgType::NoMatchPedantic:
      Diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
      break;
    case ArgType::NoMatchTypeConfusion:
      Diag = diag::warn_format_conversion_argument_type_mismatch_confusion;
      break;
    case ArgType::NoMatch:
      Diag = diag::warn_format_conversion_argument_type_mismatch;
      break;
    }

    // In this case, the specifier is wrong and should be changed to match
    // the argument.
    EmitFormatDiagnostic(S.PDiag(Diag)
                             << AT.getRepresentativeTypeName(S.Context)
                             << IntendedTy << IsEnum << E->getSourceRange(),
                         E->getBeginLoc(),
                         /*IsStringLocation*/ false, SpecRange,
                         FixItHint::CreateReplacement(SpecRange, os.str()));
  } else {
    // The canonical type for formatting this value is different from the
    // actual type of the expression. (This occurs, for example, with Darwin's
    // NSInteger on 32-bit platforms, where it is typedef'd as 'int', but
    // should be printed as 'long' for 64-bit compatibility.)
    // Rather than emitting a normal format/argument mismatch, we want to
    // add a cast to the recommended type (and correct the format string
    // if necessary).
    SmallString<16> CastBuf;
    llvm::raw_svector_ostream CastFix(CastBuf);
    CastFix << "(";
    IntendedTy.print(CastFix, S.Context.getPrintingPolicy());
    CastFix << ")";

    SmallVector<FixItHint,4> Hints;
    if (!AT.matchesType(S.Context, IntendedTy) || ShouldNotPrintDirectly)
      Hints.push_back(FixItHint::CreateReplacement(SpecRange, os.str()));

    if (const CStyleCastExpr *CCast = dyn_cast<CStyleCastExpr>(E)) {
      // If there's already a cast present, just replace it.
      SourceRange CastRange(CCast->getLParenLoc(), CCast->getRParenLoc());
      Hints.push_back(FixItHint::CreateReplacement(CastRange, CastFix.str()));

    } else if (!requiresParensToAddCast(E)) {
      // If the expression has high enough precedence,
      // just write the C-style cast.
      Hints.push_back(
          FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
    } else {
      // Otherwise, add parens around the expression as well as the cast.
      CastFix << "(";
      Hints.push_back(
          FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));

      SourceLocation After = S.getLocForEndOfToken(E->getEndLoc());
      Hints.push_back(FixItHint::CreateInsertion(After, ")"));
    }

    if (ShouldNotPrintDirectly) {
      // The expression has a type that should not be printed directly.
      // We extract the name from the typedef because we don't want to show
      // the underlying type in the diagnostic.
      StringRef Name;
      if (const TypedefType *TypedefTy = dyn_cast<TypedefType>(ExprTy))
        Name = TypedefTy->getDecl()->getName();
      else
        Name = CastTyName;
      unsigned Diag = Match == ArgType::NoMatchPedantic
                          ? diag::warn_format_argument_needs_cast_pedantic
                          : diag::warn_format_argument_needs_cast;
      EmitFormatDiagnostic(S.PDiag(Diag) << Name << IntendedTy << IsEnum
                                         << E->getSourceRange(),
                           E->getBeginLoc(), /*IsStringLocation=*/false,
                           SpecRange, Hints);
    } else {
      // In this case, the expression could be printed using a different
      // specifier, but we've decided that the specifier is probably correct
      // and we should cast instead. Just use the normal warning message.
      EmitFormatDiagnostic(
          S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
              << AT.getRepresentativeTypeName(S.Context) << ExprTy << IsEnum
              << E->getSourceRange(),
          E->getBeginLoc(), /*IsStringLocation*/ false, SpecRange, Hints);
    }
  }
} else {
  const CharSourceRange &CSR = getSpecifierRange(StartSpecifier,
                                                 SpecifierLen);
  // Since the warning for passing non-POD types to variadic functions
  // was deferred until now, we emit a warning for non-POD
  // arguments here.
  switch (S.isValidVarArgType(ExprTy)) {
  case Sema::VAK_Valid:
  case Sema::VAK_ValidInCXX11: {
    unsigned Diag;
    switch (Match) {
    case ArgType::Match: llvm_unreachable("expected non-matching")__builtin_unreachable();
    case ArgType::NoMatchPedantic:
      Diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
      break;
    case ArgType::NoMatchTypeConfusion:
      Diag = diag::warn_format_conversion_argument_type_mismatch_confusion;
      break;
    case ArgType::NoMatch:
      Diag = diag::warn_format_conversion_argument_type_mismatch;
      break;
    }

    EmitFormatDiagnostic(
        S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context) << ExprTy
                      << IsEnum << CSR << E->getSourceRange(),
        E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
    break;
  }
  case Sema::VAK_Undefined:
  case Sema::VAK_MSVCUndefined:
    EmitFormatDiagnostic(S.PDiag(diag::warn_non_pod_vararg_with_format_string)
                             << S.getLangOpts().CPlusPlus11 << ExprTy
                             << CallType
                             << AT.getRepresentativeTypeName(S.Context) << CSR
                             << E->getSourceRange(),
                         E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
    checkForCStrMembers(AT, E);
    break;

  case Sema::VAK_Invalid:
    if (ExprTy->isObjCObjectType())
      EmitFormatDiagnostic(
          S.PDiag(diag::err_cannot_pass_objc_interface_to_vararg_format)
              << S.getLangOpts().CPlusPlus11 << ExprTy << CallType
              << AT.getRepresentativeTypeName(S.Context) << CSR
              << E->getSourceRange(),
          E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
    else
      // FIXME: If this is an initializer list, suggest removing the braces
      // or inserting a cast to the target type.
      S.Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg_format)
          << isa<InitListExpr>(E) << ExprTy << CallType
          << AT.getRepresentativeTypeName(S.Context) << E->getSourceRange();
    break;
  }

  assert(FirstDataArg + FS.getArgIndex() < CheckedVarArgs.size() &&((void)0)
         "format string specifier index out of range")((void)0);
  CheckedVarArgs[FirstDataArg + FS.getArgIndex()] = true;
}

return true;
9357}

9359//===--- CHECK: Scanf format string checking ------------------------------===//

9361namespace {

9363class CheckScanfHandler : public CheckFormatHandler {
9364public:
CheckScanfHandler(Sema &s, const FormatStringLiteral *fexpr,
                  const Expr *origFormatExpr, Sema::FormatStringType type,
                  unsigned firstDataArg, unsigned numDataArgs,
                  const char *beg, bool hasVAListArg,
                  ArrayRef<const Expr *> Args, unsigned formatIdx,
                  bool inFunctionCall, Sema::VariadicCallType CallType,
                  llvm::SmallBitVector &CheckedVarArgs,
                  UncoveredArgHandler &UncoveredArg)
    : CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
                         numDataArgs, beg, hasVAListArg, Args, formatIdx,
                         inFunctionCall, CallType, CheckedVarArgs,
                         UncoveredArg) {}

bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS,
                          const char *startSpecifier,
                          unsigned specifierLen) override;

bool HandleInvalidScanfConversionSpecifier(
        const analyze_scanf::ScanfSpecifier &FS,
        const char *startSpecifier,
        unsigned specifierLen) override;

void HandleIncompleteScanList(const char *start, const char *end) override;
9388};

9390} // namespace

9392void CheckScanfHandler::HandleIncompleteScanList(const char *start,
                                               const char *end) {
EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_scanlist_incomplete),
                     getLocationOfByte(end), /*IsStringLocation*/true,
                     getSpecifierRange(start, end - start));
9397}

9399bool CheckScanfHandler::HandleInvalidScanfConversionSpecifier(
                                      const analyze_scanf::ScanfSpecifier &FS,
                                      const char *startSpecifier,
                                      unsigned specifierLen) {
const analyze_scanf::ScanfConversionSpecifier &CS =
  FS.getConversionSpecifier();

return HandleInvalidConversionSpecifier(FS.getArgIndex(),
                                        getLocationOfByte(CS.getStart()),
                                        startSpecifier, specifierLen,
                                        CS.getStart(), CS.getLength());
9410}

9412bool CheckScanfHandler::HandleScanfSpecifier(
                                     const analyze_scanf::ScanfSpecifier &FS,
                                     const char *startSpecifier,
                                     unsigned specifierLen) {
using namespace analyze_scanf;
using namespace analyze_format_string;

const ScanfConversionSpecifier &CS = FS.getConversionSpecifier();

// Handle case where '%' and '*' don't consume an argument.  These shouldn't
// be used to decide if we are using positional arguments consistently.
if (FS.consumesDataArgument()) {
  if (atFirstArg) {
    atFirstArg = false;
    usesPositionalArgs = FS.usesPositionalArg();
  }
  else if (usesPositionalArgs != FS.usesPositionalArg()) {
    HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
                                      startSpecifier, specifierLen);
    return false;
  }
}

// Check if the field with is non-zero.
const OptionalAmount &Amt = FS.getFieldWidth();
if (Amt.getHowSpecified() == OptionalAmount::Constant) {
  if (Amt.getConstantAmount() == 0) {
    const CharSourceRange &R = getSpecifierRange(Amt.getStart(),
                                                 Amt.getConstantLength());
    EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_nonzero_width),
                         getLocationOfByte(Amt.getStart()),
                         /*IsStringLocation*/true, R,
                         FixItHint::CreateRemoval(R));
  }
}

if (!FS.consumesDataArgument()) {
  // FIXME: Technically specifying a precision or field width here
  // makes no sense.  Worth issuing a warning at some point.
  return true;
}

// Consume the argument.
unsigned argIndex = FS.getArgIndex();
if (argIndex < NumDataArgs) {
    // The check to see if the argIndex is valid will come later.
    // We set the bit here because we may exit early from this
    // function if we encounter some other error.
  CoveredArgs.set(argIndex);
}

// Check the length modifier is valid with the given conversion specifier.
if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
                               S.getLangOpts()))
  HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                              diag::warn_format_nonsensical_length);
else if (!FS.hasStandardLengthModifier())
  HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
else if (!FS.hasStandardLengthConversionCombination())
  HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
                              diag::warn_format_non_standard_conversion_spec);

if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
  HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);

// The remaining checks depend on the data arguments.
if (HasVAListArg)
  return true;

if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
  return false;

// Check that the argument type matches the format specifier.
const Expr *Ex = getDataArg(argIndex);
if (!Ex)
  return true;

const analyze_format_string::ArgType &AT = FS.getArgType(S.Context);

if (!AT.isValid()) {
  return true;
}

analyze_format_string::ArgType::MatchKind Match =
    AT.matchesType(S.Context, Ex->getType());
bool Pedantic = Match == analyze_format_string::ArgType::NoMatchPedantic;
if (Match == analyze_format_string::ArgType::Match)
  return true;

ScanfSpecifier fixedFS = FS;
bool Success = fixedFS.fixType(Ex->getType(), Ex->IgnoreImpCasts()->getType(),
                               S.getLangOpts(), S.Context);

unsigned Diag =
    Pedantic ? diag::warn_format_conversion_argument_type_mismatch_pedantic
             : diag::warn_format_conversion_argument_type_mismatch;

if (Success) {
  // Get the fix string from the fixed format specifier.
  SmallString<128> buf;
  llvm::raw_svector_ostream os(buf);
  fixedFS.toString(os);

  EmitFormatDiagnostic(
      S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context)
                    << Ex->getType() << false << Ex->getSourceRange(),
      Ex->getBeginLoc(),
      /*IsStringLocation*/ false,
      getSpecifierRange(startSpecifier, specifierLen),
      FixItHint::CreateReplacement(
          getSpecifierRange(startSpecifier, specifierLen), os.str()));
} else {
  EmitFormatDiagnostic(S.PDiag(Diag)
                           << AT.getRepresentativeTypeName(S.Context)
                           << Ex->getType() << false << Ex->getSourceRange(),
                       Ex->getBeginLoc(),
                       /*IsStringLocation*/ false,
                       getSpecifierRange(startSpecifier, specifierLen));
}

return true;
9533}

9535static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
                            const Expr *OrigFormatExpr,
                            ArrayRef<const Expr *> Args,
                            bool HasVAListArg, unsigned format_idx,
                            unsigned firstDataArg,
                            Sema::FormatStringType Type,
                            bool inFunctionCall,
                            Sema::VariadicCallType CallType,
                            llvm::SmallBitVector &CheckedVarArgs,
                            UncoveredArgHandler &UncoveredArg,
                            bool IgnoreStringsWithoutSpecifiers) {
// CHECK: is the format string a wide literal?
if (!FExpr->isAscii() && !FExpr->isUTF8()) {
  CheckFormatHandler::EmitFormatDiagnostic(
      S, inFunctionCall, Args[format_idx],
      S.PDiag(diag::warn_format_string_is_wide_literal), FExpr->getBeginLoc(),
      /*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
  return;
}

// Str - The format string.  NOTE: this is NOT null-terminated!
StringRef StrRef = FExpr->getString();
const char *Str = StrRef.data();
// Account for cases where the string literal is truncated in a declaration.
const ConstantArrayType *T =
  S.Context.getAsConstantArrayType(FExpr->getType());
assert(T && "String literal not of constant array type!")((void)0);
size_t TypeSize = T->getSize().getZExtValue();
size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
const unsigned numDataArgs = Args.size() - firstDataArg;

if (IgnoreStringsWithoutSpecifiers &&
    !analyze_format_string::parseFormatStringHasFormattingSpecifiers(
        Str, Str + StrLen, S.getLangOpts(), S.Context.getTargetInfo()))
  return;

// Emit a warning if the string literal is truncated and does not contain an
// embedded null character.
if (TypeSize <= StrRef.size() &&
    StrRef.substr(0, TypeSize).find('\0') == StringRef::npos) {
  CheckFormatHandler::EmitFormatDiagnostic(
      S, inFunctionCall, Args[format_idx],
      S.PDiag(diag::warn_printf_format_string_not_null_terminated),
      FExpr->getBeginLoc(),
      /*IsStringLocation=*/true, OrigFormatExpr->getSourceRange());
  return;
}

// CHECK: empty format string?
if (StrLen == 0 && numDataArgs > 0) {
  CheckFormatHandler::EmitFormatDiagnostic(
      S, inFunctionCall, Args[format_idx],
      S.PDiag(diag::warn_empty_format_string), FExpr->getBeginLoc(),
      /*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
  return;
}

if (Type == Sema::FST_Printf || Type == Sema::FST_NSString ||
    Type == Sema::FST_Kprintf || Type == Sema::FST_FreeBSDKPrintf ||
    Type == Sema::FST_OSLog || Type == Sema::FST_OSTrace ||
    Type == Sema::FST_Syslog) {
  CheckPrintfHandler H(
      S, FExpr, OrigFormatExpr, Type, firstDataArg, numDataArgs,
      (Type == Sema::FST_NSString || Type == Sema::FST_OSTrace), Str,
      HasVAListArg, Args, format_idx, inFunctionCall, CallType,
      CheckedVarArgs, UncoveredArg);

  if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen,
                                                S.getLangOpts(),
                                                S.Context.getTargetInfo(),
              Type == Sema::FST_Kprintf || Type == Sema::FST_FreeBSDKPrintf))
    H.DoneProcessing();
} else if (Type == Sema::FST_Scanf) {
  CheckScanfHandler H(S, FExpr, OrigFormatExpr, Type, firstDataArg,
                      numDataArgs, Str, HasVAListArg, Args, format_idx,
                      inFunctionCall, CallType, CheckedVarArgs, UncoveredArg);

  if (!analyze_format_string::ParseScanfString(H, Str, Str + StrLen,
                                               S.getLangOpts(),
                                               S.Context.getTargetInfo()))
    H.DoneProcessing();
} // TODO: handle other formats
9617}

9619bool Sema::FormatStringHasSArg(const StringLiteral *FExpr) {
// Str - The format string.  NOTE: this is NOT null-terminated!
StringRef StrRef = FExpr->getString();
const char *Str = StrRef.data();
// Account for cases where the string literal is truncated in a declaration.
const ConstantArrayType *T = Context.getAsConstantArrayType(FExpr->getType());
assert(T && "String literal not of constant array type!")((void)0);
size_t TypeSize = T->getSize().getZExtValue();
size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
return analyze_format_string::ParseFormatStringHasSArg(Str, Str + StrLen,
                                                       getLangOpts(),
                                                       Context.getTargetInfo());
9631}

9633//===--- CHECK: Warn on use of wrong absolute value function. -------------===//

9635// Returns the related absolute value function that is larger, of 0 if one
9636// does not exist.
9637static unsigned getLargerAbsoluteValueFunction(unsigned AbsFunction) {
switch (AbsFunction) {
default:
  return 0;

case Builtin::BI__builtin_abs:
  return Builtin::BI__builtin_labs;
case Builtin::BI__builtin_labs:
  return Builtin::BI__builtin_llabs;
case Builtin::BI__builtin_llabs:
  return 0;

case Builtin::BI__builtin_fabsf:
  return Builtin::BI__builtin_fabs;
case Builtin::BI__builtin_fabs:
  return Builtin::BI__builtin_fabsl;
case Builtin::BI__builtin_fabsl:
  return 0;

case Builtin::BI__builtin_cabsf:
  return Builtin::BI__builtin_cabs;
case Builtin::BI__builtin_cabs:
  return Builtin::BI__builtin_cabsl;
case Builtin::BI__builtin_cabsl:
  return 0;

case Builtin::BIabs:
  return Builtin::BIlabs;
case Builtin::BIlabs:
  return Builtin::BIllabs;
case Builtin::BIllabs:
  return 0;

case Builtin::BIfabsf:
  return Builtin::BIfabs;
case Builtin::BIfabs:
  return Builtin::BIfabsl;
case Builtin::BIfabsl:
  return 0;

case Builtin::BIcabsf:
 return Builtin::BIcabs;
case Builtin::BIcabs:
  return Builtin::BIcabsl;
case Builtin::BIcabsl:
  return 0;
}
9684}

9686// Returns the argument type of the absolute value function.
9687static QualType getAbsoluteValueArgumentType(ASTContext &Context,
                                           unsigned AbsType) {
if (AbsType == 0)
  return QualType();

ASTContext::GetBuiltinTypeError Error = ASTContext::GE_None;
QualType BuiltinType = Context.GetBuiltinType(AbsType, Error);
if (Error != ASTContext::GE_None)
  return QualType();

const FunctionProtoType *FT = BuiltinType->getAs<FunctionProtoType>();
if (!FT)
  return QualType();

if (FT->getNumParams() != 1)
  return QualType();

return FT->getParamType(0);
9705}

9707// Returns the best absolute value function, or zero, based on type and
9708// current absolute value function.
9709static unsigned getBestAbsFunction(ASTContext &Context, QualType ArgType,
                                 unsigned AbsFunctionKind) {
unsigned BestKind = 0;
uint64_t ArgSize = Context.getTypeSize(ArgType);
for (unsigned Kind = AbsFunctionKind; Kind != 0;
     Kind = getLargerAbsoluteValueFunction(Kind)) {
  QualType ParamType = getAbsoluteValueArgumentType(Context, Kind);
  if (Context.getTypeSize(ParamType) >= ArgSize) {
    if (BestKind == 0)
      BestKind = Kind;
    else if (Context.hasSameType(ParamType, ArgType)) {
      BestKind = Kind;
      break;
    }
  }
}
return BestKind;
9726}

9728enum AbsoluteValueKind {
AVK_Integer,
AVK_Floating,
AVK_Complex
9732};

9734static AbsoluteValueKind getAbsoluteValueKind(QualType T) {
if (T->isIntegralOrEnumerationType())
  return AVK_Integer;
if (T->isRealFloatingType())
  return AVK_Floating;
if (T->isAnyComplexType())
  return AVK_Complex;

llvm_unreachable("Type not integer, floating, or complex")__builtin_unreachable();
9743}

9745// Changes the absolute value function to a different type.  Preserves whether
9746// the function is a builtin.
9747static unsigned changeAbsFunction(unsigned AbsKind,
                                AbsoluteValueKind ValueKind) {
switch (ValueKind) {
case AVK_Integer:
  switch (AbsKind) {
  default:
    return 0;
  case Builtin::BI__builtin_fabsf:
  case Builtin::BI__builtin_fabs:
  case Builtin::BI__builtin_fabsl:
  case Builtin::BI__builtin_cabsf:
  case Builtin::BI__builtin_cabs:
  case Builtin::BI__builtin_cabsl:
    return Builtin::BI__builtin_abs;
  case Builtin::BIfabsf:
  case Builtin::BIfabs:
  case Builtin::BIfabsl:
  case Builtin::BIcabsf:
  case Builtin::BIcabs:
  case Builtin::BIcabsl:
    return Builtin::BIabs;
  }
case AVK_Floating:
  switch (AbsKind) {
  default:
    return 0;
  case Builtin::BI__builtin_abs:
  case Builtin::BI__builtin_labs:
  case Builtin::BI__builtin_llabs:
  case Builtin::BI__builtin_cabsf:
  case Builtin::BI__builtin_cabs:
  case Builtin::BI__builtin_cabsl:
    return Builtin::BI__builtin_fabsf;
  case Builtin::BIabs:
  case Builtin::BIlabs:
  case Builtin::BIllabs:
  case Builtin::BIcabsf:
  case Builtin::BIcabs:
  case Builtin::BIcabsl:
    return Builtin::BIfabsf;
  }
case AVK_Complex:
  switch (AbsKind) {
  default:
    return 0;
  case Builtin::BI__builtin_abs:
  case Builtin::BI__builtin_labs:
  case Builtin::BI__builtin_llabs:
  case Builtin::BI__builtin_fabsf:
  case Builtin::BI__builtin_fabs:
  case Builtin::BI__builtin_fabsl:
    return Builtin::BI__builtin_cabsf;
  case Builtin::BIabs:
  case Builtin::BIlabs:
  case Builtin::BIllabs:
  case Builtin::BIfabsf:
  case Builtin::BIfabs:
  case Builtin::BIfabsl:
    return Builtin::BIcabsf;
  }
}
llvm_unreachable("Unable to convert function")__builtin_unreachable();
9809}

9811static unsigned getAbsoluteValueFunctionKind(const FunctionDecl *FDecl) {
const IdentifierInfo *FnInfo = FDecl->getIdentifier();
if (!FnInfo)
  return 0;

switch (FDecl->getBuiltinID()) {
default:
  return 0;
case Builtin::BI__builtin_abs:
case Builtin::BI__builtin_fabs:
case Builtin::BI__builtin_fabsf:
case Builtin::BI__builtin_fabsl:
case Builtin::BI__builtin_labs:
case Builtin::BI__builtin_llabs:
case Builtin::BI__builtin_cabs:
case Builtin::BI__builtin_cabsf:
case Builtin::BI__builtin_cabsl:
case Builtin::BIabs:
case Builtin::BIlabs:
case Builtin::BIllabs:
case Builtin::BIfabs:
case Builtin::BIfabsf:
case Builtin::BIfabsl:
case Builtin::BIcabs:
case Builtin::BIcabsf:
case Builtin::BIcabsl:
  return FDecl->getBuiltinID();
}
llvm_unreachable("Unknown Builtin type")__builtin_unreachable();
9840}

9842// If the replacement is valid, emit a note with replacement function.
9843// Additionally, suggest including the proper header if not already included.
9844static void emitReplacement(Sema &S, SourceLocation Loc, SourceRange Range,
                          unsigned AbsKind, QualType ArgType) {
bool EmitHeaderHint = true;
const char *HeaderName = nullptr;
const char *FunctionName = nullptr;
if (S.getLangOpts().CPlusPlus && !ArgType->isAnyComplexType()) {
  FunctionName = "std::abs";
  if (ArgType->isIntegralOrEnumerationType()) {
    HeaderName = "cstdlib";
  } else if (ArgType->isRealFloatingType()) {
    HeaderName = "cmath";
  } else {
    llvm_unreachable("Invalid Type")__builtin_unreachable();
  }

  // Lookup all std::abs
  if (NamespaceDecl *Std = S.getStdNamespace()) {
    LookupResult R(S, &S.Context.Idents.get("abs"), Loc, Sema::LookupAnyName);
    R.suppressDiagnostics();
    S.LookupQualifiedName(R, Std);

    for (const auto *I : R) {
      const FunctionDecl *FDecl = nullptr;
      if (const UsingShadowDecl *UsingD = dyn_cast<UsingShadowDecl>(I)) {
        FDecl = dyn_cast<FunctionDecl>(UsingD->getTargetDecl());
      } else {
        FDecl = dyn_cast<FunctionDecl>(I);
      }
      if (!FDecl)
        continue;

      // Found std::abs(), check that they are the right ones.
      if (FDecl->getNumParams() != 1)
        continue;

      // Check that the parameter type can handle the argument.
      QualType ParamType = FDecl->getParamDecl(0)->getType();
      if (getAbsoluteValueKind(ArgType) == getAbsoluteValueKind(ParamType) &&
          S.Context.getTypeSize(ArgType) <=
              S.Context.getTypeSize(ParamType)) {
        // Found a function, don't need the header hint.
        EmitHeaderHint = false;
        break;
      }
    }
  }
} else {
  FunctionName = S.Context.BuiltinInfo.getName(AbsKind);
  HeaderName = S.Context.BuiltinInfo.getHeaderName(AbsKind);

  if (HeaderName) {
    DeclarationName DN(&S.Context.Idents.get(FunctionName));
    LookupResult R(S, DN, Loc, Sema::LookupAnyName);
    R.suppressDiagnostics();
    S.LookupName(R, S.getCurScope());

    if (R.isSingleResult()) {
      FunctionDecl *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
      if (FD && FD->getBuiltinID() == AbsKind) {
        EmitHeaderHint = false;
      } else {
        return;
      }
    } else if (!R.empty()) {
      return;
    }
  }
}

S.Diag(Loc, diag::note_replace_abs_function)
    << FunctionName << FixItHint::CreateReplacement(Range, FunctionName);

if (!HeaderName)
  return;

if (!EmitHeaderHint)
  return;

S.Diag(Loc, diag::note_include_header_or_declare) << HeaderName
                                                  << FunctionName;
9924}

9926template <std::size_t StrLen>
9927static bool IsStdFunction(const FunctionDecl *FDecl,
                        const char (&Str)[StrLen]) {
if (!FDecl)
  return false;
if (!FDecl->getIdentifier() || !FDecl->getIdentifier()->isStr(Str))
  return false;
if (!FDecl->isInStdNamespace())
  return false;

return true;
9937}

9939// Warn when using the wrong abs() function.
9940void Sema::CheckAbsoluteValueFunction(const CallExpr *Call,
                                    const FunctionDecl *FDecl) {
if (Call->getNumArgs() != 1)
  return;

unsigned AbsKind = getAbsoluteValueFunctionKind(FDecl);
bool IsStdAbs = IsStdFunction(FDecl, "abs");
if (AbsKind == 0 && !IsStdAbs)
  return;

QualType ArgType = Call->getArg(0)->IgnoreParenImpCasts()->getType();
QualType ParamType = Call->getArg(0)->getType();

// Unsigned types cannot be negative.  Suggest removing the absolute value
// function call.
if (ArgType->isUnsignedIntegerType()) {
  const char *FunctionName =
      IsStdAbs ? "std::abs" : Context.BuiltinInfo.getName(AbsKind);
  Diag(Call->getExprLoc(), diag::warn_unsigned_abs) << ArgType << ParamType;
  Diag(Call->getExprLoc(), diag::note_remove_abs)
      << FunctionName
      << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange());
  return;
}

// Taking the absolute value of a pointer is very suspicious, they probably
// wanted to index into an array, dereference a pointer, call a function, etc.
if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
  unsigned DiagType = 0;
  if (ArgType->isFunctionType())
    DiagType = 1;
  else if (ArgType->isArrayType())
    DiagType = 2;

  Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
  return;
}

// std::abs has overloads which prevent most of the absolute value problems
// from occurring.
if (IsStdAbs)
  return;

AbsoluteValueKind ArgValueKind = getAbsoluteValueKind(ArgType);
AbsoluteValueKind ParamValueKind = getAbsoluteValueKind(ParamType);

// The argument and parameter are the same kind.  Check if they are the right
// size.
if (ArgValueKind == ParamValueKind) {
  if (Context.getTypeSize(ArgType) <= Context.getTypeSize(ParamType))
    return;

  unsigned NewAbsKind = getBestAbsFunction(Context, ArgType, AbsKind);
  Diag(Call->getExprLoc(), diag::warn_abs_too_small)
      << FDecl << ArgType << ParamType;

  if (NewAbsKind == 0)
    return;

  emitReplacement(*this, Call->getExprLoc(),
                  Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
  return;
}

// ArgValueKind != ParamValueKind
// The wrong type of absolute value function was used.  Attempt to find the
// proper one.
unsigned NewAbsKind = changeAbsFunction(AbsKind, ArgValueKind);
NewAbsKind = getBestAbsFunction(Context, ArgType, NewAbsKind);
if (NewAbsKind == 0)
  return;

Diag(Call->getExprLoc(), diag::warn_wrong_absolute_value_type)
    << FDecl << ParamValueKind << ArgValueKind;

emitReplacement(*this, Call->getExprLoc(),
                Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
10017}

10019//===--- CHECK: Warn on use of std::max and unsigned zero. r---------------===//
10020void Sema::CheckMaxUnsignedZero(const CallExpr *Call,
                              const FunctionDecl *FDecl) {
if (!Call || !FDecl) return;

// Ignore template specializations and macros.
if (inTemplateInstantiation()) return;
if (Call->getExprLoc().isMacroID()) return;

// Only care about the one template argument, two function parameter std::max
if (Call->getNumArgs() != 2) return;
if (!IsStdFunction(FDecl, "max")) return;
const auto * ArgList = FDecl->getTemplateSpecializationArgs();
if (!ArgList) return;
if (ArgList->size() != 1) return;

// Check that template type argument is unsigned integer.
const auto& TA = ArgList->get(0);
if (TA.getKind() != TemplateArgument::Type) return;
QualType ArgType = TA.getAsType();
if (!ArgType->isUnsignedIntegerType()) return;

// See if either argument is a literal zero.
auto IsLiteralZeroArg = [](const Expr* E) -> bool {
  const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E);
  if (!MTE) return false;
  const auto *Num = dyn_cast<IntegerLiteral>(MTE->getSubExpr());
  if (!Num) return false;
  if (Num->getValue() != 0) return false;
  return true;
};

const Expr *FirstArg = Call->getArg(0);
const Expr *SecondArg = Call->getArg(1);
const bool IsFirstArgZero = IsLiteralZeroArg(FirstArg);
const bool IsSecondArgZero = IsLiteralZeroArg(SecondArg);

// Only warn when exactly one argument is zero.
if (IsFirstArgZero == IsSecondArgZero) return;

SourceRange FirstRange = FirstArg->getSourceRange();
SourceRange SecondRange = SecondArg->getSourceRange();

SourceRange ZeroRange = IsFirstArgZero ? FirstRange : SecondRange;

Diag(Call->getExprLoc(), diag::warn_max_unsigned_zero)
    << IsFirstArgZero << Call->getCallee()->getSourceRange() << ZeroRange;

// Deduce what parts to remove so that "std::max(0u, foo)" becomes "(foo)".
SourceRange RemovalRange;
if (IsFirstArgZero) {
  RemovalRange = SourceRange(FirstRange.getBegin(),
                             SecondRange.getBegin().getLocWithOffset(-1));
} else {
  RemovalRange = SourceRange(getLocForEndOfToken(FirstRange.getEnd()),
                             SecondRange.getEnd());
}

Diag(Call->getExprLoc(), diag::note_remove_max_call)
      << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange())
      << FixItHint::CreateRemoval(RemovalRange);
10080}

10082//===--- CHECK: Standard memory functions ---------------------------------===//

10084/// Takes the expression passed to the size_t parameter of functions
10085/// such as memcmp, strncat, etc and warns if it's a comparison.
10086///
10087/// This is to catch typos like `if (memcmp(&a, &b, sizeof(a) > 0))`.
10088static bool CheckMemorySizeofForComparison(Sema &S, const Expr *E,
                                         IdentifierInfo *FnName,
                                         SourceLocation FnLoc,
                                         SourceLocation RParenLoc) {
const BinaryOperator *Size = dyn_cast<BinaryOperator>(E);
if (!Size)
  return false;

// if E is binop and op is <=>, >, <, >=, <=, ==, &&, ||:
if (!Size->isComparisonOp() && !Size->isLogicalOp())
  return false;

SourceRange SizeRange = Size->getSourceRange();
S.Diag(Size->getOperatorLoc(), diag::warn_memsize_comparison)
    << SizeRange << FnName;
S.Diag(FnLoc, diag::note_memsize_comparison_paren)
    << FnName
    << FixItHint::CreateInsertion(
           S.getLocForEndOfToken(Size->getLHS()->getEndLoc()), ")")
    << FixItHint::CreateRemoval(RParenLoc);
S.Diag(SizeRange.getBegin(), diag::note_memsize_comparison_cast_silence)
    << FixItHint::CreateInsertion(SizeRange.getBegin(), "(size_t)(")
    << FixItHint::CreateInsertion(S.getLocForEndOfToken(SizeRange.getEnd()),
                                  ")");

return true;
10114}

10116/// Determine whether the given type is or contains a dynamic class type
10117/// (e.g., whether it has a vtable).
10118static const CXXRecordDecl *getContainedDynamicClass(QualType T,
                                                   bool &IsContained) {
// Look through array types while ignoring qualifiers.
const Type *Ty = T->getBaseElementTypeUnsafe();
IsContained = false;

const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
RD = RD ? RD->getDefinition() : nullptr;
if (!RD || RD->isInvalidDecl())
  return nullptr;

if (RD->isDynamicClass())
  return RD;

// Check all the fields.  If any bases were dynamic, the class is dynamic.
// It's impossible for a class to transitively contain itself by value, so
// infinite recursion is impossible.
for (auto *FD : RD->fields()) {
  bool SubContained;
  if (const CXXRecordDecl *ContainedRD =
          getContainedDynamicClass(FD->getType(), SubContained)) {
    IsContained = true;
    return ContainedRD;
  }
}

return nullptr;
10145}

10147static const UnaryExprOrTypeTraitExpr *getAsSizeOfExpr(const Expr *E) {
if (const auto *Unary = dyn_cast<UnaryExprOrTypeTraitExpr>(E))
  if (Unary->getKind() == UETT_SizeOf)
    return Unary;
return nullptr;
10152}

10154/// If E is a sizeof expression, returns its argument expression,
10155/// otherwise returns NULL.
10156static const Expr *getSizeOfExprArg(const Expr *E) {
if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
  if (!SizeOf->isArgumentType())
    return SizeOf->getArgumentExpr()->IgnoreParenImpCasts();
return nullptr;
10161}

10163/// If E is a sizeof expression, returns its argument type.
10164static QualType getSizeOfArgType(const Expr *E) {
if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
  return SizeOf->getTypeOfArgument();
return QualType();
10168}

10170namespace {

10172struct SearchNonTrivialToInitializeField
  : DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField> {
using Super =
    DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField>;

SearchNonTrivialToInitializeField(const Expr *E, Sema &S) : E(E), S(S) {}

void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
                   SourceLocation SL) {
  if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
    asDerived().visitArray(PDIK, AT, SL);
    return;
  }

  Super::visitWithKind(PDIK, FT, SL);
}

void visitARCStrong(QualType FT, SourceLocation SL) {
  S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
}
void visitARCWeak(QualType FT, SourceLocation SL) {
  S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
}
void visitStruct(QualType FT, SourceLocation SL) {
  for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
    visit(FD->getType(), FD->getLocation());
}
void visitArray(QualType::PrimitiveDefaultInitializeKind PDIK,
                const ArrayType *AT, SourceLocation SL) {
  visit(getContext().getBaseElementType(AT), SL);
}
void visitTrivial(QualType FT, SourceLocation SL) {}

static void diag(QualType RT, const Expr *E, Sema &S) {
  SearchNonTrivialToInitializeField(E, S).visitStruct(RT, SourceLocation());
}

ASTContext &getContext() { return S.getASTContext(); }

const Expr *E;
Sema &S;
10213};

10215struct SearchNonTrivialToCopyField
  : CopiedTypeVisitor<SearchNonTrivialToCopyField, false> {
using Super = CopiedTypeVisitor<SearchNonTrivialToCopyField, false>;

SearchNonTrivialToCopyField(const Expr *E, Sema &S) : E(E), S(S) {}

void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType FT,
                   SourceLocation SL) {
  if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
    asDerived().visitArray(PCK, AT, SL);
    return;
  }

  Super::visitWithKind(PCK, FT, SL);
}

void visitARCStrong(QualType FT, SourceLocation SL) {
  S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
}
void visitARCWeak(QualType FT, SourceLocation SL) {
  S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
}
void visitStruct(QualType FT, SourceLocation SL) {
  for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
    visit(FD->getType(), FD->getLocation());
}
void visitArray(QualType::PrimitiveCopyKind PCK, const ArrayType *AT,
                SourceLocation SL) {
  visit(getContext().getBaseElementType(AT), SL);
}
void preVisit(QualType::PrimitiveCopyKind PCK, QualType FT,
              SourceLocation SL) {}
void visitTrivial(QualType FT, SourceLocation SL) {}
void visitVolatileTrivial(QualType FT, SourceLocation SL) {}

static void diag(QualType RT, const Expr *E, Sema &S) {
  SearchNonTrivialToCopyField(E, S).visitStruct(RT, SourceLocation());
}

ASTContext &getContext() { return S.getASTContext(); }

const Expr *E;
Sema &S;
10258};

10260}

10262/// Detect if \c SizeofExpr is likely to calculate the sizeof an object.
10263static bool doesExprLikelyComputeSize(const Expr *SizeofExpr) {
SizeofExpr = SizeofExpr->IgnoreParenImpCasts();

if (const auto *BO = dyn_cast<BinaryOperator>(SizeofExpr)) {
  if (BO->getOpcode() != BO_Mul && BO->getOpcode() != BO_Add)
    return false;

  return doesExprLikelyComputeSize(BO->getLHS()) ||
         doesExprLikelyComputeSize(BO->getRHS());
}

return getAsSizeOfExpr(SizeofExpr) != nullptr;
10275}

10277/// Check if the ArgLoc originated from a macro passed to the call at CallLoc.
10278///
10279/// \code
10280///   #define MACRO 0
10281///   foo(MACRO);
10282///   foo(0);
10283/// \endcode
10284///
10285/// This should return true for the first call to foo, but not for the second
10286/// (regardless of whether foo is a macro or function).
10287static bool isArgumentExpandedFromMacro(SourceManager &SM,
                                      SourceLocation CallLoc,
                                      SourceLocation ArgLoc) {
if (!CallLoc.isMacroID())
  return SM.getFileID(CallLoc) != SM.getFileID(ArgLoc);

return SM.getFileID(SM.getImmediateMacroCallerLoc(CallLoc)) !=
       SM.getFileID(SM.getImmediateMacroCallerLoc(ArgLoc));
10295}

10297/// Diagnose cases like 'memset(buf, sizeof(buf), 0)', which should have the
10298/// last two arguments transposed.
10299static void CheckMemaccessSize(Sema &S, unsigned BId, const CallExpr *Call) {
if (BId != Builtin::BImemset && BId != Builtin::BIbzero)
  return;

const Expr *SizeArg =
  Call->getArg(BId == Builtin::BImemset ? 2 : 1)->IgnoreImpCasts();

auto isLiteralZero = [](const Expr *E) {
  return isa<IntegerLiteral>(E) && cast<IntegerLiteral>(E)->getValue() == 0;
};

// If we're memsetting or bzeroing 0 bytes, then this is likely an error.
SourceLocation CallLoc = Call->getRParenLoc();
SourceManager &SM = S.getSourceManager();
if (isLiteralZero(SizeArg) &&
    !isArgumentExpandedFromMacro(SM, CallLoc, SizeArg->getExprLoc())) {

  SourceLocation DiagLoc = SizeArg->getExprLoc();

  // Some platforms #define bzero to __builtin_memset. See if this is the
  // case, and if so, emit a better diagnostic.
  if (BId == Builtin::BIbzero ||
      (CallLoc.isMacroID() && Lexer::getImmediateMacroName(
                                  CallLoc, SM, S.getLangOpts()) == "bzero")) {
    S.Diag(DiagLoc, diag::warn_suspicious_bzero_size);
    S.Diag(DiagLoc, diag::note_suspicious_bzero_size_silence);
  } else if (!isLiteralZero(Call->getArg(1)->IgnoreImpCasts())) {
    S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 0;
    S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 0;
  }
  return;
}

// If the second argument to a memset is a sizeof expression and the third
// isn't, this is also likely an error. This should catch
// 'memset(buf, sizeof(buf), 0xff)'.
if (BId == Builtin::BImemset &&
    doesExprLikelyComputeSize(Call->getArg(1)) &&
    !doesExprLikelyComputeSize(Call->getArg(2))) {
  SourceLocation DiagLoc = Call->getArg(1)->getExprLoc();
  S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 1;
  S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 1;
  return;
}
10343}

10345/// Check for dangerous or invalid arguments to memset().
10346///
10347/// This issues warnings on known problematic, dangerous or unspecified
10348/// arguments to the standard 'memset', 'memcpy', 'memmove', and 'memcmp'
10349/// function calls.
10350///
10351/// \param Call The call expression to diagnose.
10352void Sema::CheckMemaccessArguments(const CallExpr *Call,
                                 unsigned BId,
                                 IdentifierInfo *FnName) {
assert(BId != 0)((void)0);

// It is possible to have a non-standard definition of memset.  Validate
// we have enough arguments, and if not, abort further checking.
unsigned ExpectedNumArgs =
    (BId == Builtin::BIstrndup || BId == Builtin::BIbzero ? 2 : 3);
if (Call->getNumArgs() < ExpectedNumArgs)
  return;

unsigned LastArg = (BId == Builtin::BImemset || BId == Builtin::BIbzero ||
                    BId == Builtin::BIstrndup ? 1 : 2);
unsigned LenArg =
    (BId == Builtin::BIbzero || BId == Builtin::BIstrndup ? 1 : 2);
const Expr *LenExpr = Call->getArg(LenArg)->IgnoreParenImpCasts();

if (CheckMemorySizeofForComparison(*this, LenExpr, FnName,
                                   Call->getBeginLoc(), Call->getRParenLoc()))
  return;

// Catch cases like 'memset(buf, sizeof(buf), 0)'.
CheckMemaccessSize(*this, BId, Call);

// We have special checking when the length is a sizeof expression.
QualType SizeOfArgTy = getSizeOfArgType(LenExpr);
const Expr *SizeOfArg = getSizeOfExprArg(LenExpr);
llvm::FoldingSetNodeID SizeOfArgID;

// Although widely used, 'bzero' is not a standard function. Be more strict
// with the argument types before allowing diagnostics and only allow the
// form bzero(ptr, sizeof(...)).
QualType FirstArgTy = Call->getArg(0)->IgnoreParenImpCasts()->getType();
if (BId == Builtin::BIbzero && !FirstArgTy->getAs<PointerType>())
  return;

for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) {
  const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts();
  SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange();

  QualType DestTy = Dest->getType();
  QualType PointeeTy;
  if (const PointerType *DestPtrTy = DestTy->getAs<PointerType>()) {
    PointeeTy = DestPtrTy->getPointeeType();

    // Never warn about void type pointers. This can be used to suppress
    // false positives.
    if (PointeeTy->isVoidType())
      continue;

    // Catch "memset(p, 0, sizeof(p))" -- needs to be sizeof(*p). Do this by
    // actually comparing the expressions for equality. Because computing the
    // expression IDs can be expensive, we only do this if the diagnostic is
    // enabled.
    if (SizeOfArg &&
        !Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess,
                         SizeOfArg->getExprLoc())) {
      // We only compute IDs for expressions if the warning is enabled, and
      // cache the sizeof arg's ID.
      if (SizeOfArgID == llvm::FoldingSetNodeID())
        SizeOfArg->Profile(SizeOfArgID, Context, true);
      llvm::FoldingSetNodeID DestID;
      Dest->Profile(DestID, Context, true);
      if (DestID == SizeOfArgID) {
        // TODO: For strncpy() and friends, this could suggest sizeof(dst)
        //       over sizeof(src) as well.
        unsigned ActionIdx = 0; // Default is to suggest dereferencing.
        StringRef ReadableName = FnName->getName();

        if (const UnaryOperator *UnaryOp = dyn_cast<UnaryOperator>(Dest))
          if (UnaryOp->getOpcode() == UO_AddrOf)
            ActionIdx = 1; // If its an address-of operator, just remove it.
        if (!PointeeTy->isIncompleteType() &&
            (Context.getTypeSize(PointeeTy) == Context.getCharWidth()))
          ActionIdx = 2; // If the pointee's size is sizeof(char),
                         // suggest an explicit length.

        // If the function is defined as a builtin macro, do not show macro
        // expansion.
        SourceLocation SL = SizeOfArg->getExprLoc();
        SourceRange DSR = Dest->getSourceRange();
        SourceRange SSR = SizeOfArg->getSourceRange();
        SourceManager &SM = getSourceManager();

        if (SM.isMacroArgExpansion(SL)) {
          ReadableName = Lexer::getImmediateMacroName(SL, SM, LangOpts);
          SL = SM.getSpellingLoc(SL);
          DSR = SourceRange(SM.getSpellingLoc(DSR.getBegin()),
                           SM.getSpellingLoc(DSR.getEnd()));
          SSR = SourceRange(SM.getSpellingLoc(SSR.getBegin()),
                           SM.getSpellingLoc(SSR.getEnd()));
        }

        DiagRuntimeBehavior(SL, SizeOfArg,
                            PDiag(diag::warn_sizeof_pointer_expr_memaccess)
                              << ReadableName
                              << PointeeTy
                              << DestTy
                              << DSR
                              << SSR);
        DiagRuntimeBehavior(SL, SizeOfArg,
                       PDiag(diag::warn_sizeof_pointer_expr_memaccess_note)
                              << ActionIdx
                              << SSR);

        break;
      }
    }

    // Also check for cases where the sizeof argument is the exact same
    // type as the memory argument, and where it points to a user-defined
    // record type.
    if (SizeOfArgTy != QualType()) {
      if (PointeeTy->isRecordType() &&
          Context.typesAreCompatible(SizeOfArgTy, DestTy)) {
        DiagRuntimeBehavior(LenExpr->getExprLoc(), Dest,
                            PDiag(diag::warn_sizeof_pointer_type_memaccess)
                              << FnName << SizeOfArgTy << ArgIdx
                              << PointeeTy << Dest->getSourceRange()
                              << LenExpr->getSourceRange());
        break;
      }
    }
  } else if (DestTy->isArrayType()) {
    PointeeTy = DestTy;
  }

  if (PointeeTy == QualType())
    continue;

  // Always complain about dynamic classes.
  bool IsContained;
  if (const CXXRecordDecl *ContainedRD =
          getContainedDynamicClass(PointeeTy, IsContained)) {

    unsigned OperationType = 0;
    const bool IsCmp = BId == Builtin::BImemcmp || BId == Builtin::BIbcmp;
    // "overwritten" if we're warning about the destination for any call
    // but memcmp; otherwise a verb appropriate to the call.
    if (ArgIdx != 0 || IsCmp) {
      if (BId == Builtin::BImemcpy)
        OperationType = 1;
      else if(BId == Builtin::BImemmove)
        OperationType = 2;
      else if (IsCmp)
        OperationType = 3;
    }

    DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
                        PDiag(diag::warn_dyn_class_memaccess)
                            << (IsCmp ? ArgIdx + 2 : ArgIdx) << FnName
                            << IsContained << ContainedRD << OperationType
                            << Call->getCallee()->getSourceRange());
  } else if (PointeeTy.hasNonTrivialObjCLifetime() &&
           BId != Builtin::BImemset)
    DiagRuntimeBehavior(
      Dest->getExprLoc(), Dest,
      PDiag(diag::warn_arc_object_memaccess)
        << ArgIdx << FnName << PointeeTy
        << Call->getCallee()->getSourceRange());
  else if (const auto *RT = PointeeTy->getAs<RecordType>()) {
    if ((BId == Builtin::BImemset || BId == Builtin::BIbzero) &&
        RT->getDecl()->isNonTrivialToPrimitiveDefaultInitialize()) {
      DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
                          PDiag(diag::warn_cstruct_memaccess)
                              << ArgIdx << FnName << PointeeTy << 0);
      SearchNonTrivialToInitializeField::diag(PointeeTy, Dest, *this);
    } else if ((BId == Builtin::BImemcpy || BId == Builtin::BImemmove) &&
               RT->getDecl()->isNonTrivialToPrimitiveCopy()) {
      DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
                          PDiag(diag::warn_cstruct_memaccess)
                              << ArgIdx << FnName << PointeeTy << 1);
      SearchNonTrivialToCopyField::diag(PointeeTy, Dest, *this);
    } else {
      continue;
    }
  } else
    continue;

  DiagRuntimeBehavior(
    Dest->getExprLoc(), Dest,
    PDiag(diag::note_bad_memaccess_silence)
      << FixItHint::CreateInsertion(ArgRange.getBegin(), "(void*)"));
  break;
}
10538}

10540// A little helper routine: ignore addition and subtraction of integer literals.
10541// This intentionally does not ignore all integer constant expressions because
10542// we don't want to remove sizeof().
10543static const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) {
Ex = Ex->IgnoreParenCasts();

while (true) {
  const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex);
  if (!BO || !BO->isAdditiveOp())
    break;

  const Expr *RHS = BO->getRHS()->IgnoreParenCasts();
  const Expr *LHS = BO->getLHS()->IgnoreParenCasts();

  if (isa<IntegerLiteral>(RHS))
    Ex = LHS;
  else if (isa<IntegerLiteral>(LHS))
    Ex = RHS;
  else
    break;
}

return Ex;
10563}

10565static bool isConstantSizeArrayWithMoreThanOneElement(QualType Ty,
                                                    ASTContext &Context) {
// Only handle constant-sized or VLAs, but not flexible members.
if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(Ty)) {
  // Only issue the FIXIT for arrays of size > 1.
  if (CAT->getSize().getSExtValue() <= 1)
    return false;
} else if (!Ty->isVariableArrayType()) {
  return false;
}
return true;
10576}

10578// Warn if the user has made the 'size' argument to strlcpy or strlcat
10579// be the size of the source, instead of the destination.
10580void Sema::CheckStrlcpycatArguments(const CallExpr *Call,
                                  IdentifierInfo *FnName) {

// Don't crash if the user has the wrong number of arguments
unsigned NumArgs = Call->getNumArgs();
if ((NumArgs != 3) && (NumArgs != 4))
  return;

const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context);
const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context);
const Expr *CompareWithSrc = nullptr;

if (CheckMemorySizeofForComparison(*this, SizeArg, FnName,
                                   Call->getBeginLoc(), Call->getRParenLoc()))
  return;

// Look for 'strlcpy(dst, x, sizeof(x))'
if (const Expr *Ex = getSizeOfExprArg(SizeArg))
  CompareWithSrc = Ex;
else {
  // Look for 'strlcpy(dst, x, strlen(x))'
  if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) {
    if (SizeCall->getBuiltinCallee() == Builtin::BIstrlen &&
        SizeCall->getNumArgs() == 1)
      CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context);
  }
}

if (!CompareWithSrc)
  return;

// Determine if the argument to sizeof/strlen is equal to the source
// argument.  In principle there's all kinds of things you could do
// here, for instance creating an == expression and evaluating it with
// EvaluateAsBooleanCondition, but this uses a more direct technique:
const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg);
if (!SrcArgDRE)
  return;

const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc);
if (!CompareWithSrcDRE ||
    SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl())
  return;

const Expr *OriginalSizeArg = Call->getArg(2);
Diag(CompareWithSrcDRE->getBeginLoc(), diag::warn_strlcpycat_wrong_size)
    << OriginalSizeArg->getSourceRange() << FnName;

// Output a FIXIT hint if the destination is an array (rather than a
// pointer to an array).  This could be enhanced to handle some
// pointers if we know the actual size, like if DstArg is 'array+2'
// we could say 'sizeof(array)-2'.
const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts();
if (!isConstantSizeArrayWithMoreThanOneElement(DstArg->getType(), Context))
  return;

SmallString<128> sizeString;
llvm::raw_svector_ostream OS(sizeString);
OS << "sizeof(";
DstArg->printPretty(OS, nullptr, getPrintingPolicy());
OS << ")";

Diag(OriginalSizeArg->getBeginLoc(), diag::note_strlcpycat_wrong_size)
    << FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(),
                                    OS.str());
10645}

10647/// Check if two expressions refer to the same declaration.
10648static bool referToTheSameDecl(const Expr *E1, const Expr *E2) {
if (const DeclRefExpr *D1 = dyn_cast_or_null<DeclRefExpr>(E1))
  if (const DeclRefExpr *D2 = dyn_cast_or_null<DeclRefExpr>(E2))
    return D1->getDecl() == D2->getDecl();
return false;
10653}

10655static const Expr *getStrlenExprArg(const Expr *E) {
if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
  const FunctionDecl *FD = CE->getDirectCallee();
  if (!FD || FD->getMemoryFunctionKind() != Builtin::BIstrlen)
    return nullptr;
  return CE->getArg(0)->IgnoreParenCasts();
}
return nullptr;
10663}

10665// Warn on anti-patterns as the 'size' argument to strncat.
10666// The correct size argument should look like following:
10667//   strncat(dst, src, sizeof(dst) - strlen(dest) - 1);
10668void Sema::CheckStrncatArguments(const CallExpr *CE,
                               IdentifierInfo *FnName) {
// Don't crash if the user has the wrong number of arguments.
if (CE->getNumArgs() < 3)
  return;
const Expr *DstArg = CE->getArg(0)->IgnoreParenCasts();
const Expr *SrcArg = CE->getArg(1)->IgnoreParenCasts();
const Expr *LenArg = CE->getArg(2)->IgnoreParenCasts();

if (CheckMemorySizeofForComparison(*this, LenArg, FnName, CE->getBeginLoc(),
                                   CE->getRParenLoc()))
  return;

// Identify common expressions, which are wrongly used as the size argument
// to strncat and may lead to buffer overflows.
unsigned PatternType = 0;
if (const Expr *SizeOfArg = getSizeOfExprArg(LenArg)) {
  // - sizeof(dst)
  if (referToTheSameDecl(SizeOfArg, DstArg))
    PatternType = 1;
  // - sizeof(src)
  else if (referToTheSameDecl(SizeOfArg, SrcArg))
    PatternType = 2;
} else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(LenArg)) {
  if (BE->getOpcode() == BO_Sub) {
    const Expr *L = BE->getLHS()->IgnoreParenCasts();
    const Expr *R = BE->getRHS()->IgnoreParenCasts();
    // - sizeof(dst) - strlen(dst)
    if (referToTheSameDecl(DstArg, getSizeOfExprArg(L)) &&
        referToTheSameDecl(DstArg, getStrlenExprArg(R)))
      PatternType = 1;
    // - sizeof(src) - (anything)
    else if (referToTheSameDecl(SrcArg, getSizeOfExprArg(L)))
      PatternType = 2;
  }
}

if (PatternType == 0)
  return;

// Generate the diagnostic.
SourceLocation SL = LenArg->getBeginLoc();
SourceRange SR = LenArg->getSourceRange();
SourceManager &SM = getSourceManager();

// If the function is defined as a builtin macro, do not show macro expansion.
if (SM.isMacroArgExpansion(SL)) {
  SL = SM.getSpellingLoc(SL);
  SR = SourceRange(SM.getSpellingLoc(SR.getBegin()),
                   SM.getSpellingLoc(SR.getEnd()));
}

// Check if the destination is an array (rather than a pointer to an array).
QualType DstTy = DstArg->getType();
bool isKnownSizeArray = isConstantSizeArrayWithMoreThanOneElement(DstTy,
                                                                  Context);
if (!isKnownSizeArray) {
  if (PatternType == 1)
    Diag(SL, diag::warn_strncat_wrong_size) << SR;
  else
    Diag(SL, diag::warn_strncat_src_size) << SR;
  return;
}

if (PatternType == 1)
  Diag(SL, diag::warn_strncat_large_size) << SR;
else
  Diag(SL, diag::warn_strncat_src_size) << SR;

SmallString<128> sizeString;
llvm::raw_svector_ostream OS(sizeString);
OS << "sizeof(";
DstArg->printPretty(OS, nullptr, getPrintingPolicy());
OS << ") - ";
OS << "strlen(";
DstArg->printPretty(OS, nullptr, getPrintingPolicy());
OS << ") - 1";

Diag(SL, diag::note_strncat_wrong_size)
  << FixItHint::CreateReplacement(SR, OS.str());
10748}

10750namespace {
10751void CheckFreeArgumentsOnLvalue(Sema &S, const std::string &CalleeName,
                              const UnaryOperator *UnaryExpr, const Decl *D) {
if (isa<FieldDecl, FunctionDecl, VarDecl>(D)) {
  S.Diag(UnaryExpr->getBeginLoc(), diag::warn_free_nonheap_object)
      << CalleeName << 0 /*object: */ << cast<NamedDecl>(D);
  return;
}
10758}

10760void CheckFreeArgumentsAddressof(Sema &S, const std::string &CalleeName,
                               const UnaryOperator *UnaryExpr) {
if (const auto *Lvalue = dyn_cast<DeclRefExpr>(UnaryExpr->getSubExpr())) {
  const Decl *D = Lvalue->getDecl();
  if (isa<DeclaratorDecl>(D))
    if (!dyn_cast<DeclaratorDecl>(D)->getType()->isReferenceType())
      return CheckFreeArgumentsOnLvalue(S, CalleeName, UnaryExpr, D);
}

if (const auto *Lvalue = dyn_cast<MemberExpr>(UnaryExpr->getSubExpr()))
  return CheckFreeArgumentsOnLvalue(S, CalleeName, UnaryExpr,
                                    Lvalue->getMemberDecl());
10772}

10774void CheckFreeArgumentsPlus(Sema &S, const std::string &CalleeName,
                          const UnaryOperator *UnaryExpr) {
const auto *Lambda = dyn_cast<LambdaExpr>(
    UnaryExpr->getSubExpr()->IgnoreImplicitAsWritten()->IgnoreParens());
if (!Lambda)
  return;

S.Diag(Lambda->getBeginLoc(), diag::warn_free_nonheap_object)
    << CalleeName << 2 /*object: lambda expression*/;
10783}

10785void CheckFreeArgumentsStackArray(Sema &S, const std::string &CalleeName,
                                const DeclRefExpr *Lvalue) {
const auto *Var = dyn_cast<VarDecl>(Lvalue->getDecl());
if (Var == nullptr)
  return;

S.Diag(Lvalue->getBeginLoc(), diag::warn_free_nonheap_object)
    << CalleeName << 0 /*object: */ << Var;
10793}

10795void CheckFreeArgumentsCast(Sema &S, const std::string &CalleeName,
                          const CastExpr *Cast) {
SmallString<128> SizeString;
llvm::raw_svector_ostream OS(SizeString);

clang::CastKind Kind = Cast->getCastKind();
if (Kind == clang::CK_BitCast &&
    !Cast->getSubExpr()->getType()->isFunctionPointerType())
  return;
if (Kind == clang::CK_IntegralToPointer &&
    !isa<IntegerLiteral>(
        Cast->getSubExpr()->IgnoreParenImpCasts()->IgnoreParens()))
  return;

switch (Cast->getCastKind()) {
case clang::CK_BitCast:
case clang::CK_IntegralToPointer:
case clang::CK_FunctionToPointerDecay:
  OS << '\'';
  Cast->printPretty(OS, nullptr, S.getPrintingPolicy());
  OS << '\'';
  break;
default:
  return;
}

S.Diag(Cast->getBeginLoc(), diag::warn_free_nonheap_object)
    << CalleeName << 0 /*object: */ << OS.str();
10823}
10824} // namespace

10826/// Alerts the user that they are attempting to free a non-malloc'd object.
10827void Sema::CheckFreeArguments(const CallExpr *E) {
const std::string CalleeName =
    dyn_cast<FunctionDecl>(E->getCalleeDecl())->getQualifiedNameAsString();
12
←
Assuming the object is not a 'FunctionDecl'→
13
←
Called C++ object pointer is null

{ // Prefer something that doesn't involve a cast to make things simpler.
  const Expr *Arg = E->getArg(0)->IgnoreParenCasts();
  if (const auto *UnaryExpr = dyn_cast<UnaryOperator>(Arg))
    switch (UnaryExpr->getOpcode()) {
    case UnaryOperator::Opcode::UO_AddrOf:
      return CheckFreeArgumentsAddressof(*this, CalleeName, UnaryExpr);
    case UnaryOperator::Opcode::UO_Plus:
      return CheckFreeArgumentsPlus(*this, CalleeName, UnaryExpr);
    default:
      break;
    }

  if (const auto *Lvalue = dyn_cast<DeclRefExpr>(Arg))
    if (Lvalue->getType()->isArrayType())
      return CheckFreeArgumentsStackArray(*this, CalleeName, Lvalue);

  if (const auto *Label = dyn_cast<AddrLabelExpr>(Arg)) {
    Diag(Label->getBeginLoc(), diag::warn_free_nonheap_object)
        << CalleeName << 0 /*object: */ << Label->getLabel()->getIdentifier();
    return;
  }

  if (isa<BlockExpr>(Arg)) {
    Diag(Arg->getBeginLoc(), diag::warn_free_nonheap_object)
        << CalleeName << 1 /*object: block*/;
    return;
  }
}
// Maybe the cast was important, check after the other cases.
if (const auto *Cast = dyn_cast<CastExpr>(E->getArg(0)))
  return CheckFreeArgumentsCast(*this, CalleeName, Cast);
10862}

10864void
10865Sema::CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
                       SourceLocation ReturnLoc,
                       bool isObjCMethod,
                       const AttrVec *Attrs,
                       const FunctionDecl *FD) {
// Check if the return value is null but should not be.
if (((Attrs && hasSpecificAttr<ReturnsNonNullAttr>(*Attrs)) ||
     (!isObjCMethod && isNonNullType(Context, lhsType))) &&
    CheckNonNullExpr(*this, RetValExp))
  Diag(ReturnLoc, diag::warn_null_ret)
    << (isObjCMethod ? 1 : 0) << RetValExp->getSourceRange();

// C++11 [basic.stc.dynamic.allocation]p4:
//   If an allocation function declared with a non-throwing
//   exception-specification fails to allocate storage, it shall return
//   a null pointer. Any other allocation function that fails to allocate
//   storage shall indicate failure only by throwing an exception [...]
if (FD) {
  OverloadedOperatorKind Op = FD->getOverloadedOperator();
  if (Op == OO_New || Op == OO_Array_New) {
    const FunctionProtoType *Proto
      = FD->getType()->castAs<FunctionProtoType>();
    if (!Proto->isNothrow(/*ResultIfDependent*/true) &&
        CheckNonNullExpr(*this, RetValExp))
      Diag(ReturnLoc, diag::warn_operator_new_returns_null)
        << FD << getLangOpts().CPlusPlus11;
  }
}

// PPC MMA non-pointer types are not allowed as return type. Checking the type
// here prevent the user from using a PPC MMA type as trailing return type.
if (Context.getTargetInfo().getTriple().isPPC64())
  CheckPPCMMAType(RetValExp->getType(), ReturnLoc);
10898}

10900//===--- CHECK: Floating-Point comparisons (-Wfloat-equal) ---------------===//

10902/// Check for comparisons of floating point operands using != and ==.
10903/// Issue a warning if these are no self-comparisons, as they are not likely
10904/// to do what the programmer intended.
10905void Sema::CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr *RHS) {
Expr* LeftExprSansParen = LHS->IgnoreParenImpCasts();
Expr* RightExprSansParen = RHS->IgnoreParenImpCasts();

// Special case: check for x == x (which is OK).
// Do not emit warnings for such cases.
if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LeftExprSansParen))
  if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RightExprSansParen))
    if (DRL->getDecl() == DRR->getDecl())
      return;

// Special case: check for comparisons against literals that can be exactly
//  represented by APFloat.  In such cases, do not emit a warning.  This
//  is a heuristic: often comparison against such literals are used to
//  detect if a value in a variable has not changed.  This clearly can
//  lead to false negatives.
if (FloatingLiteral* FLL = dyn_cast<FloatingLiteral>(LeftExprSansParen)) {
  if (FLL->isExact())
    return;
} else
  if (FloatingLiteral* FLR = dyn_cast<FloatingLiteral>(RightExprSansParen))
    if (FLR->isExact())
      return;

// Check for comparisons with builtin types.
if (CallExpr* CL = dyn_cast<CallExpr>(LeftExprSansParen))
  if (CL->getBuiltinCallee())
    return;

if (CallExpr* CR = dyn_cast<CallExpr>(RightExprSansParen))
  if (CR->getBuiltinCallee())
    return;

// Emit the diagnostic.
Diag(Loc, diag::warn_floatingpoint_eq)
  << LHS->getSourceRange() << RHS->getSourceRange();
10941}

10943//===--- CHECK: Integer mixed-sign comparisons (-Wsign-compare) --------===//
10944//===--- CHECK: Lossy implicit conversions (-Wconversion) --------------===//

10946namespace {

10948/// Structure recording the 'active' range of an integer-valued
10949/// expression.
10950struct IntRange {
/// The number of bits active in the int. Note that this includes exactly one
/// sign bit if !NonNegative.
unsigned Width;

/// True if the int is known not to have negative values. If so, all leading
/// bits before Width are known zero, otherwise they are known to be the
/// same as the MSB within Width.
bool NonNegative;

IntRange(unsigned Width, bool NonNegative)
    : Width(Width), NonNegative(NonNegative) {}

/// Number of bits excluding the sign bit.
unsigned valueBits() const {
  return NonNegative ? Width : Width - 1;
}

/// Returns the range of the bool type.
static IntRange forBoolType() {
  return IntRange(1, true);
}

/// Returns the range of an opaque value of the given integral type.
static IntRange forValueOfType(ASTContext &C, QualType T) {
  return forValueOfCanonicalType(C,
                        T->getCanonicalTypeInternal().getTypePtr());
}

/// Returns the range of an opaque value of a canonical integral type.
static IntRange forValueOfCanonicalType(ASTContext &C, const Type *T) {
  assert(T->isCanonicalUnqualified())((void)0);

  if (const VectorType *VT = dyn_cast<VectorType>(T))
    T = VT->getElementType().getTypePtr();
  if (const ComplexType *CT = dyn_cast<ComplexType>(T))
    T = CT->getElementType().getTypePtr();
  if (const AtomicType *AT = dyn_cast<AtomicType>(T))
    T = AT->getValueType().getTypePtr();

  if (!C.getLangOpts().CPlusPlus) {
    // For enum types in C code, use the underlying datatype.
    if (const EnumType *ET = dyn_cast<EnumType>(T))
      T = ET->getDecl()->getIntegerType().getDesugaredType(C).getTypePtr();
  } else if (const EnumType *ET = dyn_cast<EnumType>(T)) {
    // For enum types in C++, use the known bit width of the enumerators.
    EnumDecl *Enum = ET->getDecl();
    // In C++11, enums can have a fixed underlying type. Use this type to
    // compute the range.
    if (Enum->isFixed()) {
      return IntRange(C.getIntWidth(QualType(T, 0)),
                      !ET->isSignedIntegerOrEnumerationType());
    }

    unsigned NumPositive = Enum->getNumPositiveBits();
    unsigned NumNegative = Enum->getNumNegativeBits();

    if (NumNegative == 0)
      return IntRange(NumPositive, true/*NonNegative*/);
    else
      return IntRange(std::max(NumPositive + 1, NumNegative),
                      false/*NonNegative*/);
  }

  if (const auto *EIT = dyn_cast<ExtIntType>(T))
    return IntRange(EIT->getNumBits(), EIT->isUnsigned());

  const BuiltinType *BT = cast<BuiltinType>(T);
  assert(BT->isInteger())((void)0);

  return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
}

/// Returns the "target" range of a canonical integral type, i.e.
/// the range of values expressible in the type.
///
/// This matches forValueOfCanonicalType except that enums have the
/// full range of their type, not the range of their enumerators.
static IntRange forTargetOfCanonicalType(ASTContext &C, const Type *T) {
  assert(T->isCanonicalUnqualified())((void)0);

  if (const VectorType *VT = dyn_cast<VectorType>(T))
    T = VT->getElementType().getTypePtr();
  if (const ComplexType *CT = dyn_cast<ComplexType>(T))
    T = CT->getElementType().getTypePtr();
  if (const AtomicType *AT = dyn_cast<AtomicType>(T))
    T = AT->getValueType().getTypePtr();
  if (const EnumType *ET = dyn_cast<EnumType>(T))
    T = C.getCanonicalType(ET->getDecl()->getIntegerType()).getTypePtr();

  if (const auto *EIT = dyn_cast<ExtIntType>(T))
    return IntRange(EIT->getNumBits(), EIT->isUnsigned());

  const BuiltinType *BT = cast<BuiltinType>(T);
  assert(BT->isInteger())((void)0);

  return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
}

/// Returns the supremum of two ranges: i.e. their conservative merge.
static IntRange join(IntRange L, IntRange R) {
  bool Unsigned = L.NonNegative && R.NonNegative;
  return IntRange(std::max(L.valueBits(), R.valueBits()) + !Unsigned,
                  L.NonNegative && R.NonNegative);
}

/// Return the range of a bitwise-AND of the two ranges.
static IntRange bit_and(IntRange L, IntRange R) {
  unsigned Bits = std::max(L.Width, R.Width);
  bool NonNegative = false;
  if (L.NonNegative) {
    Bits = std::min(Bits, L.Width);
    NonNegative = true;
  }
  if (R.NonNegative) {
    Bits = std::min(Bits, R.Width);
    NonNegative = true;
  }
  return IntRange(Bits, NonNegative);
}

/// Return the range of a sum of the two ranges.
static IntRange sum(IntRange L, IntRange R) {
  bool Unsigned = L.NonNegative && R.NonNegative;
  return IntRange(std::max(L.valueBits(), R.valueBits()) + 1 + !Unsigned,
                  Unsigned);
}

/// Return the range of a difference of the two ranges.
static IntRange difference(IntRange L, IntRange R) {
  // We need a 1-bit-wider range if:
  //   1) LHS can be negative: least value can be reduced.
  //   2) RHS can be negative: greatest value can be increased.
  bool CanWiden = !L.NonNegative || !R.NonNegative;
  bool Unsigned = L.NonNegative && R.Width == 0;
  return IntRange(std::max(L.valueBits(), R.valueBits()) + CanWiden +
                      !Unsigned,
                  Unsigned);
}

/// Return the range of a product of the two ranges.
static IntRange product(IntRange L, IntRange R) {
  // If both LHS and RHS can be negative, we can form
  //   -2^L * -2^R = 2^(L + R)
  // which requires L + R + 1 value bits to represent.
  bool CanWiden = !L.NonNegative && !R.NonNegative;
  bool Unsigned = L.NonNegative && R.NonNegative;
  return IntRange(L.valueBits() + R.valueBits() + CanWiden + !Unsigned,
                  Unsigned);
}

/// Return the range of a remainder operation between the two ranges.
static IntRange rem(IntRange L, IntRange R) {
  // The result of a remainder can't be larger than the result of
  // either side. The sign of the result is the sign of the LHS.
  bool Unsigned = L.NonNegative;
  return IntRange(std::min(L.valueBits(), R.valueBits()) + !Unsigned,
                  Unsigned);
}
11109};

11111} // namespace

11113static IntRange GetValueRange(ASTContext &C, llvm::APSInt &value,
                            unsigned MaxWidth) {
if (value.isSigned() && value.isNegative())
  return IntRange(value.getMinSignedBits(), false);

if (value.getBitWidth() > MaxWidth)
  value = value.trunc(MaxWidth);

// isNonNegative() just checks the sign bit without considering
// signedness.
return IntRange(value.getActiveBits(), true);
11124}

11126static IntRange GetValueRange(ASTContext &C, APValue &result, QualType Ty,
                            unsigned MaxWidth) {
if (result.isInt())
  return GetValueRange(C, result.getInt(), MaxWidth);

if (result.isVector()) {
  IntRange R = GetValueRange(C, result.getVectorElt(0), Ty, MaxWidth);
  for (unsigned i = 1, e = result.getVectorLength(); i != e; ++i) {
    IntRange El = GetValueRange(C, result.getVectorElt(i), Ty, MaxWidth);
    R = IntRange::join(R, El);
  }
  return R;
}

if (result.isComplexInt()) {
  IntRange R = GetValueRange(C, result.getComplexIntReal(), MaxWidth);
  IntRange I = GetValueRange(C, result.getComplexIntImag(), MaxWidth);
  return IntRange::join(R, I);
}

// This can happen with lossless casts to intptr_t of "based" lvalues.
// Assume it might use arbitrary bits.
// FIXME: The only reason we need to pass the type in here is to get
// the sign right on this one case.  It would be nice if APValue
// preserved this.
assert(result.isLValue() || result.isAddrLabelDiff())((void)0);
return IntRange(MaxWidth, Ty->isUnsignedIntegerOrEnumerationType());
11153}

11155static QualType GetExprType(const Expr *E) {
QualType Ty = E->getType();
if (const AtomicType *AtomicRHS = Ty->getAs<AtomicType>())
  Ty = AtomicRHS->getValueType();
return Ty;
11160}

11162/// Pseudo-evaluate the given integer expression, estimating the
11163/// range of values it might take.
11164///
11165/// \param MaxWidth The width to which the value will be truncated.
11166/// \param Approximate If \c true, return a likely range for the result: in
11167///        particular, assume that aritmetic on narrower types doesn't leave
11168///        those types. If \c false, return a range including all possible
11169///        result values.
11170static IntRange GetExprRange(ASTContext &C, const Expr *E, unsigned MaxWidth,
                           bool InConstantContext, bool Approximate) {
E = E->IgnoreParens();

// Try a full evaluation first.
Expr::EvalResult result;
if (E->EvaluateAsRValue(result, C, InConstantContext))
  return GetValueRange(C, result.Val, GetExprType(E), MaxWidth);

// I think we only want to look through implicit casts here; if the
// user has an explicit widening cast, we should treat the value as
// being of the new, wider type.
if (const auto *CE = dyn_cast<ImplicitCastExpr>(E)) {
  if (CE->getCastKind() == CK_NoOp || CE->getCastKind() == CK_LValueToRValue)
    return GetExprRange(C, CE->getSubExpr(), MaxWidth, InConstantContext,
                        Approximate);

  IntRange OutputTypeRange = IntRange::forValueOfType(C, GetExprType(CE));

  bool isIntegerCast = CE->getCastKind() == CK_IntegralCast ||
                       CE->getCastKind() == CK_BooleanToSignedIntegral;

  // Assume that non-integer casts can span the full range of the type.
  if (!isIntegerCast)
    return OutputTypeRange;

  IntRange SubRange = GetExprRange(C, CE->getSubExpr(),
                                   std::min(MaxWidth, OutputTypeRange.Width),
                                   InConstantContext, Approximate);

  // Bail out if the subexpr's range is as wide as the cast type.
  if (SubRange.Width >= OutputTypeRange.Width)
    return OutputTypeRange;

  // Otherwise, we take the smaller width, and we're non-negative if
  // either the output type or the subexpr is.
  return IntRange(SubRange.Width,
                  SubRange.NonNegative || OutputTypeRange.NonNegative);
}

if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
  // If we can fold the condition, just take that operand.
  bool CondResult;
  if (CO->getCond()->EvaluateAsBooleanCondition(CondResult, C))
    return GetExprRange(C,
                        CondResult ? CO->getTrueExpr() : CO->getFalseExpr(),
                        MaxWidth, InConstantContext, Approximate);

  // Otherwise, conservatively merge.
  // GetExprRange requires an integer expression, but a throw expression
  // results in a void type.
  Expr *E = CO->getTrueExpr();
  IntRange L = E->getType()->isVoidType()
                   ? IntRange{0, true}
                   : GetExprRange(C, E, MaxWidth, InConstantContext, Approximate);
  E = CO->getFalseExpr();
  IntRange R = E->getType()->isVoidType()
                   ? IntRange{0, true}
                   : GetExprRange(C, E, MaxWidth, InConstantContext, Approximate);
  return IntRange::join(L, R);
}

if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
  IntRange (*Combine)(IntRange, IntRange) = IntRange::join;

  switch (BO->getOpcode()) {
  case BO_Cmp:
    llvm_unreachable("builtin <=> should have class type")__builtin_unreachable();

  // Boolean-valued operations are single-bit and positive.
  case BO_LAnd:
  case BO_LOr:
  case BO_LT:
  case BO_GT:
  case BO_LE:
  case BO_GE:
  case BO_EQ:
  case BO_NE:
    return IntRange::forBoolType();

  // The type of the assignments is the type of the LHS, so the RHS
  // is not necessarily the same type.
  case BO_MulAssign:
  case BO_DivAssign:
  case BO_RemAssign:
  case BO_AddAssign:
  case BO_SubAssign:
  case BO_XorAssign:
  case BO_OrAssign:
    // TODO: bitfields?
    return IntRange::forValueOfType(C, GetExprType(E));

  // Simple assignments just pass through the RHS, which will have
  // been coerced to the LHS type.
  case BO_Assign:
    // TODO: bitfields?
    return GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext,
                        Approximate);

  // Operations with opaque sources are black-listed.
  case BO_PtrMemD:
  case BO_PtrMemI:
    return IntRange::forValueOfType(C, GetExprType(E));

  // Bitwise-and uses the *infinum* of the two source ranges.
  case BO_And:
  case BO_AndAssign:
    Combine = IntRange::bit_and;
    break;

  // Left shift gets black-listed based on a judgement call.
  case BO_Shl:
    // ...except that we want to treat '1 << (blah)' as logically
    // positive.  It's an important idiom.
    if (IntegerLiteral *I
          = dyn_cast<IntegerLiteral>(BO->getLHS()->IgnoreParenCasts())) {
      if (I->getValue() == 1) {
        IntRange R = IntRange::forValueOfType(C, GetExprType(E));
        return IntRange(R.Width, /*NonNegative*/ true);
      }
    }
    LLVM_FALLTHROUGH[[gnu::fallthrough]];

  case BO_ShlAssign:
    return IntRange::forValueOfType(C, GetExprType(E));

  // Right shift by a constant can narrow its left argument.
  case BO_Shr:
  case BO_ShrAssign: {
    IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth, InConstantContext,
                              Approximate);

    // If the shift amount is a positive constant, drop the width by
    // that much.
    if (Optional<llvm::APSInt> shift =
            BO->getRHS()->getIntegerConstantExpr(C)) {
      if (shift->isNonNegative()) {
        unsigned zext = shift->getZExtValue();
        if (zext >= L.Width)
          L.Width = (L.NonNegative ? 0 : 1);
        else
          L.Width -= zext;
      }
    }

    return L;
  }

  // Comma acts as its right operand.
  case BO_Comma:
    return GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext,
                        Approximate);

  case BO_Add:
    if (!Approximate)
      Combine = IntRange::sum;
    break;

  case BO_Sub:
    if (BO->getLHS()->getType()->isPointerType())
      return IntRange::forValueOfType(C, GetExprType(E));
    if (!Approximate)
      Combine = IntRange::difference;
    break;

  case BO_Mul:
    if (!Approximate)
      Combine = IntRange::product;
    break;

  // The width of a division result is mostly determined by the size
  // of the LHS.
  case BO_Div: {
    // Don't 'pre-truncate' the operands.
    unsigned opWidth = C.getIntWidth(GetExprType(E));
    IntRange L = GetExprRange(C, BO->getLHS(), opWidth, InConstantContext,
                              Approximate);

    // If the divisor is constant, use that.
    if (Optional<llvm::APSInt> divisor =
            BO->getRHS()->getIntegerConstantExpr(C)) {
      unsigned log2 = divisor->logBase2(); // floor(log_2(divisor))
      if (log2 >= L.Width)
        L.Width = (L.NonNegative ? 0 : 1);
      else
        L.Width = std::min(L.Width - log2, MaxWidth);
      return L;
    }

    // Otherwise, just use the LHS's width.
    // FIXME: This is wrong if the LHS could be its minimal value and the RHS
    // could be -1.
    IntRange R = GetExprRange(C, BO->getRHS(), opWidth, InConstantContext,
                              Approximate);
    return IntRange(L.Width, L.NonNegative && R.NonNegative);
  }

  case BO_Rem:
    Combine = IntRange::rem;
    break;

  // The default behavior is okay for these.
  case BO_Xor:
  case BO_Or:
    break;
  }

  // Combine the two ranges, but limit the result to the type in which we
  // performed the computation.
  QualType T = GetExprType(E);
  unsigned opWidth = C.getIntWidth(T);
  IntRange L =
      GetExprRange(C, BO->getLHS(), opWidth, InConstantContext, Approximate);
  IntRange R =
      GetExprRange(C, BO->getRHS(), opWidth, InConstantContext, Approximate);
  IntRange C = Combine(L, R);
  C.NonNegative |= T->isUnsignedIntegerOrEnumerationType();
  C.Width = std::min(C.Width, MaxWidth);
  return C;
}

if (const auto *UO = dyn_cast<UnaryOperator>(E)) {
  switch (UO->getOpcode()) {
  // Boolean-valued operations are white-listed.
  case UO_LNot:
    return IntRange::forBoolType();

  // Operations with opaque sources are black-listed.
  case UO_Deref:
  case UO_AddrOf: // should be impossible
    return IntRange::forValueOfType(C, GetExprType(E));

  default:
    return GetExprRange(C, UO->getSubExpr(), MaxWidth, InConstantContext,
                        Approximate);
  }
}

if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
  return GetExprRange(C, OVE->getSourceExpr(), MaxWidth, InConstantContext,
                      Approximate);

if (const auto *BitField = E->getSourceBitField())
  return IntRange(BitField->getBitWidthValue(C),
                  BitField->getType()->isUnsignedIntegerOrEnumerationType());

return IntRange::forValueOfType(C, GetExprType(E));
11417}

11419static IntRange GetExprRange(ASTContext &C, const Expr *E,
                           bool InConstantContext, bool Approximate) {
return GetExprRange(C, E, C.getIntWidth(GetExprType(E)), InConstantContext,
                    Approximate);
11423}

11425/// Checks whether the given value, which currently has the given
11426/// source semantics, has the same value when coerced through the
11427/// target semantics.
11428static bool IsSameFloatAfterCast(const llvm::APFloat &value,
                               const llvm::fltSemantics &Src,
                               const llvm::fltSemantics &Tgt) {
llvm::APFloat truncated = value;

bool ignored;
truncated.convert(Src, llvm::APFloat::rmNearestTiesToEven, &ignored);
truncated.convert(Tgt, llvm::APFloat::rmNearestTiesToEven, &ignored);

return truncated.bitwiseIsEqual(value);
11438}

11440/// Checks whether the given value, which currently has the given
11441/// source semantics, has the same value when coerced through the
11442/// target semantics.
11443///
11444/// The value might be a vector of floats (or a complex number).
11445static bool IsSameFloatAfterCast(const APValue &value,
                               const llvm::fltSemantics &Src,
                               const llvm::fltSemantics &Tgt) {
if (value.isFloat())
  return IsSameFloatAfterCast(value.getFloat(), Src, Tgt);

if (value.isVector()) {
  for (unsigned i = 0, e = value.getVectorLength(); i != e; ++i)
    if (!IsSameFloatAfterCast(value.getVectorElt(i), Src, Tgt))
      return false;
  return true;
}

assert(value.isComplexFloat())((void)0);
return (IsSameFloatAfterCast(value.getComplexFloatReal(), Src, Tgt) &&
        IsSameFloatAfterCast(value.getComplexFloatImag(), Src, Tgt));
11461}

11463static void AnalyzeImplicitConversions(Sema &S, Expr *E, SourceLocation CC,
                                     bool IsListInit = false);

11466static bool IsEnumConstOrFromMacro(Sema &S, Expr *E) {
// Suppress cases where we are comparing against an enum constant.
if (const DeclRefExpr *DR =
    dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts()))
  if (isa<EnumConstantDecl>(DR->getDecl()))
    return true;

// Suppress cases where the value is expanded from a macro, unless that macro
// is how a language represents a boolean literal. This is the case in both C
// and Objective-C.
SourceLocation BeginLoc = E->getBeginLoc();
if (BeginLoc.isMacroID()) {
  StringRef MacroName = Lexer::getImmediateMacroName(
      BeginLoc, S.getSourceManager(), S.getLangOpts());
  return MacroName != "YES" && MacroName != "NO" &&
         MacroName != "true" && MacroName != "false";
}

return false;
11485}

11487static bool isKnownToHaveUnsignedValue(Expr *E) {
return E->getType()->isIntegerType() &&
       (!E->getType()->isSignedIntegerType() ||
        !E->IgnoreParenImpCasts()->getType()->isSignedIntegerType());
11491}

11493namespace {
11494/// The promoted range of values of a type. In general this has the
11495/// following structure:
11496///
11497///     |-----------| . . . |-----------|
11498///     ^           ^       ^           ^
11499///    Min       HoleMin  HoleMax      Max
11500///
11501/// ... where there is only a hole if a signed type is promoted to unsigned
11502/// (in which case Min and Max are the smallest and largest representable
11503/// values).
11504struct PromotedRange {
// Min, or HoleMax if there is a hole.
llvm::APSInt PromotedMin;
// Max, or HoleMin if there is a hole.
llvm::APSInt PromotedMax;

PromotedRange(IntRange R, unsigned BitWidth, bool Unsigned) {
  if (R.Width == 0)
    PromotedMin = PromotedMax = llvm::APSInt(BitWidth, Unsigned);
  else if (R.Width >= BitWidth && !Unsigned) {
    // Promotion made the type *narrower*. This happens when promoting
    // a < 32-bit unsigned / <= 32-bit signed bit-field to 'signed int'.
    // Treat all values of 'signed int' as being in range for now.
    PromotedMin = llvm::APSInt::getMinValue(BitWidth, Unsigned);
    PromotedMax = llvm::APSInt::getMaxValue(BitWidth, Unsigned);
  } else {
    PromotedMin = llvm::APSInt::getMinValue(R.Width, R.NonNegative)
                      .extOrTrunc(BitWidth);
    PromotedMin.setIsUnsigned(Unsigned);

    PromotedMax = llvm::APSInt::getMaxValue(R.Width, R.NonNegative)
                      .extOrTrunc(BitWidth);
    PromotedMax.setIsUnsigned(Unsigned);
  }
}

// Determine whether this range is contiguous (has no hole).
bool isContiguous() const { return PromotedMin <= PromotedMax; }

// Where a constant value is within the range.
enum ComparisonResult {
  LT = 0x1,
  LE = 0x2,
  GT = 0x4,
  GE = 0x8,
  EQ = 0x10,
  NE = 0x20,
  InRangeFlag = 0x40,

  Less = LE | LT | NE,
  Min = LE | InRangeFlag,
  InRange = InRangeFlag,
  Max = GE | InRangeFlag,
  Greater = GE | GT | NE,

  OnlyValue = LE | GE | EQ | InRangeFlag,
  InHole = NE
};

ComparisonResult compare(const llvm::APSInt &Value) const {
  assert(Value.getBitWidth() == PromotedMin.getBitWidth() &&((void)0)
         Value.isUnsigned() == PromotedMin.isUnsigned())((void)0);
  if (!isContiguous()) {
    assert(Value.isUnsigned() && "discontiguous range for signed compare")((void)0);
    if (Value.isMinValue()) return Min;
    if (Value.isMaxValue()) return Max;
    if (Value >= PromotedMin) return InRange;
    if (Value <= PromotedMax) return InRange;
    return InHole;
  }

  switch (llvm::APSInt::compareValues(Value, PromotedMin)) {
  case -1: return Less;
  case 0: return PromotedMin == PromotedMax ? OnlyValue : Min;
  case 1:
    switch (llvm::APSInt::compareValues(Value, PromotedMax)) {
    case -1: return InRange;
    case 0: return Max;
    case 1: return Greater;
    }
  }

  llvm_unreachable("impossible compare result")__builtin_unreachable();
}

static llvm::Optional<StringRef>
constantValue(BinaryOperatorKind Op, ComparisonResult R, bool ConstantOnRHS) {
  if (Op == BO_Cmp) {
    ComparisonResult LTFlag = LT, GTFlag = GT;
    if (ConstantOnRHS) std::swap(LTFlag, GTFlag);

    if (R & EQ) return StringRef("'std::strong_ordering::equal'");
    if (R & LTFlag) return StringRef("'std::strong_ordering::less'");
    if (R & GTFlag) return StringRef("'std::strong_ordering::greater'");
    return llvm::None;
  }

  ComparisonResult TrueFlag, FalseFlag;
  if (Op == BO_EQ) {
    TrueFlag = EQ;
    FalseFlag = NE;
  } else if (Op == BO_NE) {
    TrueFlag = NE;
    FalseFlag = EQ;
  } else {
    if ((Op == BO_LT || Op == BO_GE) ^ ConstantOnRHS) {
      TrueFlag = LT;
      FalseFlag = GE;
    } else {
      TrueFlag = GT;
      FalseFlag = LE;
    }
    if (Op == BO_GE || Op == BO_LE)
      std::swap(TrueFlag, FalseFlag);
  }
  if (R & TrueFlag)
    return StringRef("true");
  if (R & FalseFlag)
    return StringRef("false");
  return llvm::None;
}
11615};
11616}

11618static bool HasEnumType(Expr *E) {
// Strip off implicit integral promotions.
while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
  if (ICE->getCastKind() != CK_IntegralCast &&
      ICE->getCastKind() != CK_NoOp)
    break;
  E = ICE->getSubExpr();
}

return E->getType()->isEnumeralType();
11628}

11630static int classifyConstantValue(Expr *Constant) {
// The values of this enumeration are used in the diagnostics
// diag::warn_out_of_range_compare and diag::warn_tautological_bool_compare.
enum ConstantValueKind {
  Miscellaneous = 0,
  LiteralTrue,
  LiteralFalse
};
if (auto *BL = dyn_cast<CXXBoolLiteralExpr>(Constant))
  return BL->getValue() ? ConstantValueKind::LiteralTrue
                        : ConstantValueKind::LiteralFalse;
return ConstantValueKind::Miscellaneous;
11642}

11644static bool CheckTautologicalComparison(Sema &S, BinaryOperator *E,
                                      Expr *Constant, Expr *Other,
                                      const llvm::APSInt &Value,
                                      bool RhsConstant) {
if (S.inTemplateInstantiation())
  return false;

Expr *OriginalOther = Other;

Constant = Constant->IgnoreParenImpCasts();
Other = Other->IgnoreParenImpCasts();

// Suppress warnings on tautological comparisons between values of the same
// enumeration type. There are only two ways we could warn on this:
//  - If the constant is outside the range of representable values of
//    the enumeration. In such a case, we should warn about the cast
//    to enumeration type, not about the comparison.
//  - If the constant is the maximum / minimum in-range value. For an
//    enumeratin type, such comparisons can be meaningful and useful.
if (Constant->getType()->isEnumeralType() &&
    S.Context.hasSameUnqualifiedType(Constant->getType(), Other->getType()))
  return false;

IntRange OtherValueRange = GetExprRange(
    S.Context, Other, S.isConstantEvaluated(), /*Approximate*/ false);

QualType OtherT = Other->getType();
if (const auto *AT = OtherT->getAs<AtomicType>())
  OtherT = AT->getValueType();
IntRange OtherTypeRange = IntRange::forValueOfType(S.Context, OtherT);

// Special case for ObjC BOOL on targets where its a typedef for a signed char
// (Namely, macOS). FIXME: IntRange::forValueOfType should do this.
bool IsObjCSignedCharBool = S.getLangOpts().ObjC &&
                            S.NSAPIObj->isObjCBOOLType(OtherT) &&
                            OtherT->isSpecificBuiltinType(BuiltinType::SChar);

// Whether we're treating Other as being a bool because of the form of
// expression despite it having another type (typically 'int' in C).
bool OtherIsBooleanDespiteType =
    !OtherT->isBooleanType() && Other->isKnownToHaveBooleanValue();
if (OtherIsBooleanDespiteType || IsObjCSignedCharBool)
  OtherTypeRange = OtherValueRange = IntRange::forBoolType();

// Check if all values in the range of possible values of this expression
// lead to the same comparison outcome.
PromotedRange OtherPromotedValueRange(OtherValueRange, Value.getBitWidth(),
                                      Value.isUnsigned());
auto Cmp = OtherPromotedValueRange.compare(Value);
auto Result = PromotedRange::constantValue(E->getOpcode(), Cmp, RhsConstant);
if (!Result)
  return false;

// Also consider the range determined by the type alone. This allows us to
// classify the warning under the proper diagnostic group.
bool TautologicalTypeCompare = false;
{
  PromotedRange OtherPromotedTypeRange(OtherTypeRange, Value.getBitWidth(),
                                       Value.isUnsigned());
  auto TypeCmp = OtherPromotedTypeRange.compare(Value);
  if (auto TypeResult = PromotedRange::constantValue(E->getOpcode(), TypeCmp,
                                                     RhsConstant)) {
    TautologicalTypeCompare = true;
    Cmp = TypeCmp;
    Result = TypeResult;
  }
}

// Don't warn if the non-constant operand actually always evaluates to the
// same value.
if (!TautologicalTypeCompare && OtherValueRange.Width == 0)
  return false;

// Suppress the diagnostic for an in-range comparison if the constant comes
// from a macro or enumerator. We don't want to diagnose
//
//   some_long_value <= INT_MAX
//
// when sizeof(int) == sizeof(long).
bool InRange = Cmp & PromotedRange::InRangeFlag;
if (InRange && IsEnumConstOrFromMacro(S, Constant))
  return false;

// A comparison of an unsigned bit-field against 0 is really a type problem,
// even though at the type level the bit-field might promote to 'signed int'.
if (Other->refersToBitField() && InRange && Value == 0 &&
    Other->getType()->isUnsignedIntegerOrEnumerationType())
  TautologicalTypeCompare = true;

// If this is a comparison to an enum constant, include that
// constant in the diagnostic.
const EnumConstantDecl *ED = nullptr;
if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Constant))
  ED = dyn_cast<EnumConstantDecl>(DR->getDecl());

// Should be enough for uint128 (39 decimal digits)
SmallString<64> PrettySourceValue;
llvm::raw_svector_ostream OS(PrettySourceValue);
if (ED) {
  OS << '\'' << *ED << "' (" << Value << ")";
} else if (auto *BL = dyn_cast<ObjCBoolLiteralExpr>(
             Constant->IgnoreParenImpCasts())) {
  OS << (BL->getValue() ? "YES" : "NO");
} else {
  OS << Value;
}

if (!TautologicalTypeCompare) {
  S.Diag(E->getOperatorLoc(), diag::warn_tautological_compare_value_range)
      << RhsConstant << OtherValueRange.Width << OtherValueRange.NonNegative
      << E->getOpcodeStr() << OS.str() << *Result
      << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
  return true;
}

if (IsObjCSignedCharBool) {
  S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
                        S.PDiag(diag::warn_tautological_compare_objc_bool)
                            << OS.str() << *Result);
  return true;
}

// FIXME: We use a somewhat different formatting for the in-range cases and
// cases involving boolean values for historical reasons. We should pick a
// consistent way of presenting these diagnostics.
if (!InRange || Other->isKnownToHaveBooleanValue()) {

  S.DiagRuntimeBehavior(
      E->getOperatorLoc(), E,
      S.PDiag(!InRange ? diag::warn_out_of_range_compare
                       : diag::warn_tautological_bool_compare)
          << OS.str() << classifyConstantValue(Constant) << OtherT
          << OtherIsBooleanDespiteType << *Result
          << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange());
} else {
  bool IsCharTy = OtherT.withoutLocalFastQualifiers() == S.Context.CharTy;
  unsigned Diag =
      (isKnownToHaveUnsignedValue(OriginalOther) && Value == 0)
          ? (HasEnumType(OriginalOther)
                 ? diag::warn_unsigned_enum_always_true_comparison
                 : IsCharTy ? diag::warn_unsigned_char_always_true_comparison
                            : diag::warn_unsigned_always_true_comparison)
          : diag::warn_tautological_constant_compare;

  S.Diag(E->getOperatorLoc(), Diag)
      << RhsConstant << OtherT << E->getOpcodeStr() << OS.str() << *Result
      << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
}

return true;
11794}

11796/// Analyze the operands of the given comparison.  Implements the
11797/// fallback case from AnalyzeComparison.
11798static void AnalyzeImpConvsInComparison(Sema &S, BinaryOperator *E) {
AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
11801}

11803/// Implements -Wsign-compare.
11804///
11805/// \param E the binary operator to check for warnings
11806static void AnalyzeComparison(Sema &S, BinaryOperator *E) {
// The type the comparison is being performed in.
QualType T = E->getLHS()->getType();

// Only analyze comparison operators where both sides have been converted to
// the same type.
if (!S.Context.hasSameUnqualifiedType(T, E->getRHS()->getType()))
  return AnalyzeImpConvsInComparison(S, E);

// Don't analyze value-dependent comparisons directly.
if (E->isValueDependent())
  return AnalyzeImpConvsInComparison(S, E);

Expr *LHS = E->getLHS();
Expr *RHS = E->getRHS();

if (T->isIntegralType(S.Context)) {
  Optional<llvm::APSInt> RHSValue = RHS->getIntegerConstantExpr(S.Context);
  Optional<llvm::APSInt> LHSValue = LHS->getIntegerConstantExpr(S.Context);

  // We don't care about expressions whose result is a constant.
  if (RHSValue && LHSValue)
    return AnalyzeImpConvsInComparison(S, E);

  // We only care about expressions where just one side is literal
  if ((bool)RHSValue ^ (bool)LHSValue) {
    // Is the constant on the RHS or LHS?
    const bool RhsConstant = (bool)RHSValue;
    Expr *Const = RhsConstant ? RHS : LHS;
    Expr *Other = RhsConstant ? LHS : RHS;
    const llvm::APSInt &Value = RhsConstant ? *RHSValue : *LHSValue;

    // Check whether an integer constant comparison results in a value
    // of 'true' or 'false'.
    if (CheckTautologicalComparison(S, E, Const, Other, Value, RhsConstant))
      return AnalyzeImpConvsInComparison(S, E);
  }
}

if (!T->hasUnsignedIntegerRepresentation()) {
  // We don't do anything special if this isn't an unsigned integral
  // comparison:  we're only interested in integral comparisons, and
  // signed comparisons only happen in cases we don't care to warn about.
  return AnalyzeImpConvsInComparison(S, E);
}

LHS = LHS->IgnoreParenImpCasts();
RHS = RHS->IgnoreParenImpCasts();

if (!S.getLangOpts().CPlusPlus) {
  // Avoid warning about comparison of integers with different signs when
  // RHS/LHS has a `typeof(E)` type whose sign is different from the sign of
  // the type of `E`.
  if (const auto *TET = dyn_cast<TypeOfExprType>(LHS->getType()))
    LHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
  if (const auto *TET = dyn_cast<TypeOfExprType>(RHS->getType()))
    RHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
}

// Check to see if one of the (unmodified) operands is of different
// signedness.
Expr *signedOperand, *unsignedOperand;
if (LHS->getType()->hasSignedIntegerRepresentation()) {
  assert(!RHS->getType()->hasSignedIntegerRepresentation() &&((void)0)
         "unsigned comparison between two signed integer expressions?")((void)0);
  signedOperand = LHS;
  unsignedOperand = RHS;
} else if (RHS->getType()->hasSignedIntegerRepresentation()) {
  signedOperand = RHS;
  unsignedOperand = LHS;
} else {
  return AnalyzeImpConvsInComparison(S, E);
}

// Otherwise, calculate the effective range of the signed operand.
IntRange signedRange = GetExprRange(
    S.Context, signedOperand, S.isConstantEvaluated(), /*Approximate*/ true);

// Go ahead and analyze implicit conversions in the operands.  Note
// that we skip the implicit conversions on both sides.
AnalyzeImplicitConversions(S, LHS, E->getOperatorLoc());
AnalyzeImplicitConversions(S, RHS, E->getOperatorLoc());

// If the signed range is non-negative, -Wsign-compare won't fire.
if (signedRange.NonNegative)
  return;

// For (in)equality comparisons, if the unsigned operand is a
// constant which cannot collide with a overflowed signed operand,
// then reinterpreting the signed operand as unsigned will not
// change the result of the comparison.
if (E->isEqualityOp()) {
  unsigned comparisonWidth = S.Context.getIntWidth(T);
  IntRange unsignedRange =
      GetExprRange(S.Context, unsignedOperand, S.isConstantEvaluated(),
                   /*Approximate*/ true);

  // We should never be unable to prove that the unsigned operand is
  // non-negative.
  assert(unsignedRange.NonNegative && "unsigned range includes negative?")((void)0);

  if (unsignedRange.Width < comparisonWidth)
    return;
}

S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
                      S.PDiag(diag::warn_mixed_sign_comparison)
                          << LHS->getType() << RHS->getType()
                          << LHS->getSourceRange() << RHS->getSourceRange());
11915}

11917/// Analyzes an attempt to assign the given value to a bitfield.
11918///
11919/// Returns true if there was something fishy about the attempt.
11920static bool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init,
                                    SourceLocation InitLoc) {
assert(Bitfield->isBitField())((void)0);
if (Bitfield->isInvalidDecl())
  return false;

// White-list bool bitfields.
QualType BitfieldType = Bitfield->getType();
if (BitfieldType->isBooleanType())
   return false;

if (BitfieldType->isEnumeralType()) {
  EnumDecl *BitfieldEnumDecl = BitfieldType->castAs<EnumType>()->getDecl();
  // If the underlying enum type was not explicitly specified as an unsigned
  // type and the enum contain only positive values, MSVC++ will cause an
  // inconsistency by storing this as a signed type.
  if (S.getLangOpts().CPlusPlus11 &&
      !BitfieldEnumDecl->getIntegerTypeSourceInfo() &&
      BitfieldEnumDecl->getNumPositiveBits() > 0 &&
      BitfieldEnumDecl->getNumNegativeBits() == 0) {
    S.Diag(InitLoc, diag::warn_no_underlying_type_specified_for_enum_bitfield)
        << BitfieldEnumDecl;
  }
}

if (Bitfield->getType()->isBooleanType())
  return false;

// Ignore value- or type-dependent expressions.
if (Bitfield->getBitWidth()->isValueDependent() ||
    Bitfield->getBitWidth()->isTypeDependent() ||
    Init->isValueDependent() ||
    Init->isTypeDependent())
  return false;

Expr *OriginalInit = Init->IgnoreParenImpCasts();
unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context);

Expr::EvalResult Result;
if (!OriginalInit->EvaluateAsInt(Result, S.Context,
                                 Expr::SE_AllowSideEffects)) {
  // The RHS is not constant.  If the RHS has an enum type, make sure the
  // bitfield is wide enough to hold all the values of the enum without
  // truncation.
  if (const auto *EnumTy = OriginalInit->getType()->getAs<EnumType>()) {
    EnumDecl *ED = EnumTy->getDecl();
    bool SignedBitfield = BitfieldType->isSignedIntegerType();

    // Enum types are implicitly signed on Windows, so check if there are any
    // negative enumerators to see if the enum was intended to be signed or
    // not.
    bool SignedEnum = ED->getNumNegativeBits() > 0;

    // Check for surprising sign changes when assigning enum values to a
    // bitfield of different signedness.  If the bitfield is signed and we
    // have exactly the right number of bits to store this unsigned enum,
    // suggest changing the enum to an unsigned type. This typically happens
    // on Windows where unfixed enums always use an underlying type of 'int'.
    unsigned DiagID = 0;
    if (SignedEnum && !SignedBitfield) {
      DiagID = diag::warn_unsigned_bitfield_assigned_signed_enum;
    } else if (SignedBitfield && !SignedEnum &&
               ED->getNumPositiveBits() == FieldWidth) {
      DiagID = diag::warn_signed_bitfield_enum_conversion;
    }

    if (DiagID) {
      S.Diag(InitLoc, DiagID) << Bitfield << ED;
      TypeSourceInfo *TSI = Bitfield->getTypeSourceInfo();
      SourceRange TypeRange =
          TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange();
      S.Diag(Bitfield->getTypeSpecStartLoc(), diag::note_change_bitfield_sign)
          << SignedEnum << TypeRange;
    }

    // Compute the required bitwidth. If the enum has negative values, we need
    // one more bit than the normal number of positive bits to represent the
    // sign bit.
    unsigned BitsNeeded = SignedEnum ? std::max(ED->getNumPositiveBits() + 1,
                                                ED->getNumNegativeBits())
                                     : ED->getNumPositiveBits();

    // Check the bitwidth.
    if (BitsNeeded > FieldWidth) {
      Expr *WidthExpr = Bitfield->getBitWidth();
      S.Diag(InitLoc, diag::warn_bitfield_too_small_for_enum)
          << Bitfield << ED;
      S.Diag(WidthExpr->getExprLoc(), diag::note_widen_bitfield)
          << BitsNeeded << ED << WidthExpr->getSourceRange();
    }
  }

  return false;
}

llvm::APSInt Value = Result.Val.getInt();

unsigned OriginalWidth = Value.getBitWidth();

if (!Value.isSigned() || Value.isNegative())
  if (UnaryOperator *UO = dyn_cast<UnaryOperator>(OriginalInit))
    if (UO->getOpcode() == UO_Minus || UO->getOpcode() == UO_Not)
      OriginalWidth = Value.getMinSignedBits();

if (OriginalWidth <= FieldWidth)
  return false;

// Compute the value which the bitfield will contain.
llvm::APSInt TruncatedValue = Value.trunc(FieldWidth);
TruncatedValue.setIsSigned(BitfieldType->isSignedIntegerType());

// Check whether the stored value is equal to the original value.
TruncatedValue = TruncatedValue.extend(OriginalWidth);
if (llvm::APSInt::isSameValue(Value, TruncatedValue))
  return false;

// Special-case bitfields of width 1: booleans are naturally 0/1, and
// therefore don't strictly fit into a signed bitfield of width 1.
if (FieldWidth == 1 && Value == 1)
  return false;

std::string PrettyValue = toString(Value, 10);
std::string PrettyTrunc = toString(TruncatedValue, 10);

S.Diag(InitLoc, diag::warn_impcast_bitfield_precision_constant)
  << PrettyValue << PrettyTrunc << OriginalInit->getType()
  << Init->getSourceRange();

return true;
12049}

12051/// Analyze the given simple or compound assignment for warning-worthy
12052/// operations.
12053static void AnalyzeAssignment(Sema &S, BinaryOperator *E) {
// Just recurse on the LHS.
AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());

// We want to recurse on the RHS as normal unless we're assigning to
// a bitfield.
if (FieldDecl *Bitfield = E->getLHS()->getSourceBitField()) {
  if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(),
                                E->getOperatorLoc())) {
    // Recurse, ignoring any implicit conversions on the RHS.
    return AnalyzeImplicitConversions(S, E->getRHS()->IgnoreParenImpCasts(),
                                      E->getOperatorLoc());
  }
}

AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());

// Diagnose implicitly sequentially-consistent atomic assignment.
if (E->getLHS()->getType()->isAtomicType())
  S.Diag(E->getRHS()->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
12073}

12075/// Diagnose an implicit cast;  purely a helper for CheckImplicitConversion.
12076static void DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T,
                          SourceLocation CContext, unsigned diag,
                          bool pruneControlFlow = false) {
if (pruneControlFlow) {
  S.DiagRuntimeBehavior(E->getExprLoc(), E,
                        S.PDiag(diag)
                            << SourceType << T << E->getSourceRange()
                            << SourceRange(CContext));
  return;
}
S.Diag(E->getExprLoc(), diag)
  << SourceType << T << E->getSourceRange() << SourceRange(CContext);
12088}

12090/// Diagnose an implicit cast;  purely a helper for CheckImplicitConversion.
12091static void DiagnoseImpCast(Sema &S, Expr *E, QualType T,
                          SourceLocation CContext,
                          unsigned diag, bool pruneControlFlow = false) {
DiagnoseImpCast(S, E, E->getType(), T, CContext, diag, pruneControlFlow);
12095}

12097static bool isObjCSignedCharBool(Sema &S, QualType Ty) {
return Ty->isSpecificBuiltinType(BuiltinType::SChar) &&
    S.getLangOpts().ObjC && S.NSAPIObj->isObjCBOOLType(Ty);
12100}

12102static void adornObjCBoolConversionDiagWithTernaryFixit(
  Sema &S, Expr *SourceExpr, const Sema::SemaDiagnosticBuilder &Builder) {
Expr *Ignored = SourceExpr->IgnoreImplicit();
if (const auto *OVE = dyn_cast<OpaqueValueExpr>(Ignored))
  Ignored = OVE->getSourceExpr();
bool NeedsParens = isa<AbstractConditionalOperator>(Ignored) ||
                   isa<BinaryOperator>(Ignored) ||
                   isa<CXXOperatorCallExpr>(Ignored);
SourceLocation EndLoc = S.getLocForEndOfToken(SourceExpr->getEndLoc());
if (NeedsParens)
  Builder << FixItHint::CreateInsertion(SourceExpr->getBeginLoc(), "(")
          << FixItHint::CreateInsertion(EndLoc, ")");
Builder << FixItHint::CreateInsertion(EndLoc, " ? YES : NO");
12115}

12117/// Diagnose an implicit cast from a floating point value to an integer value.
12118static void DiagnoseFloatingImpCast(Sema &S, Expr *E, QualType T,
                                  SourceLocation CContext) {
const bool IsBool = T->isSpecificBuiltinType(BuiltinType::Bool);
const bool PruneWarnings = S.inTemplateInstantiation();

Expr *InnerE = E->IgnoreParenImpCasts();
// We also want to warn on, e.g., "int i = -1.234"
if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(InnerE))
  if (UOp->getOpcode() == UO_Minus || UOp->getOpcode() == UO_Plus)
    InnerE = UOp->getSubExpr()->IgnoreParenImpCasts();

const bool IsLiteral =
    isa<FloatingLiteral>(E) || isa<FloatingLiteral>(InnerE);

llvm::APFloat Value(0.0);
bool IsConstant =
  E->EvaluateAsFloat(Value, S.Context, Expr::SE_AllowSideEffects);
if (!IsConstant) {
  if (isObjCSignedCharBool(S, T)) {
    return adornObjCBoolConversionDiagWithTernaryFixit(
        S, E,
        S.Diag(CContext, diag::warn_impcast_float_to_objc_signed_char_bool)
            << E->getType());
  }

  return DiagnoseImpCast(S, E, T, CContext,
                         diag::warn_impcast_float_integer, PruneWarnings);
}

bool isExact = false;

llvm::APSInt IntegerValue(S.Context.getIntWidth(T),
                          T->hasUnsignedIntegerRepresentation());
llvm::APFloat::opStatus Result = Value.convertToInteger(
    IntegerValue, llvm::APFloat::rmTowardZero, &isExact);

// FIXME: Force the precision of the source value down so we don't print
// digits which are usually useless (we don't really care here if we
// truncate a digit by accident in edge cases).  Ideally, APFloat::toString
// would automatically print the shortest representation, but it's a bit
// tricky to implement.
SmallString<16> PrettySourceValue;
unsigned precision = llvm::APFloat::semanticsPrecision(Value.getSemantics());
precision = (precision * 59 + 195) / 196;
Value.toString(PrettySourceValue, precision);

if (isObjCSignedCharBool(S, T) && IntegerValue != 0 && IntegerValue != 1) {
  return adornObjCBoolConversionDiagWithTernaryFixit(
      S, E,
      S.Diag(CContext, diag::warn_impcast_constant_value_to_objc_bool)
          << PrettySourceValue);
}

if (Result == llvm::APFloat::opOK && isExact) {
  if (IsLiteral) return;
  return DiagnoseImpCast(S, E, T, CContext, diag::warn_impcast_float_integer,
                         PruneWarnings);
}

// Conversion of a floating-point value to a non-bool integer where the
// integral part cannot be represented by the integer type is undefined.
if (!IsBool && Result == llvm::APFloat::opInvalidOp)
  return DiagnoseImpCast(
      S, E, T, CContext,
      IsLiteral ? diag::warn_impcast_literal_float_to_integer_out_of_range
                : diag::warn_impcast_float_to_integer_out_of_range,
      PruneWarnings);

unsigned DiagID = 0;
if (IsLiteral) {
  // Warn on floating point literal to integer.
  DiagID = diag::warn_impcast_literal_float_to_integer;
} else if (IntegerValue == 0) {
  if (Value.isZero()) {  // Skip -0.0 to 0 conversion.
    return DiagnoseImpCast(S, E, T, CContext,
                           diag::warn_impcast_float_integer, PruneWarnings);
  }
  // Warn on non-zero to zero conversion.
  DiagID = diag::warn_impcast_float_to_integer_zero;
} else {
  if (IntegerValue.isUnsigned()) {
    if (!IntegerValue.isMaxValue()) {
      return DiagnoseImpCast(S, E, T, CContext,
                             diag::warn_impcast_float_integer, PruneWarnings);
    }
  } else {  // IntegerValue.isSigned()
    if (!IntegerValue.isMaxSignedValue() &&
        !IntegerValue.isMinSignedValue()) {
      return DiagnoseImpCast(S, E, T, CContext,
                             diag::warn_impcast_float_integer, PruneWarnings);
    }
  }
  // Warn on evaluatable floating point expression to integer conversion.
  DiagID = diag::warn_impcast_float_to_integer;
}

SmallString<16> PrettyTargetValue;
if (IsBool)
  PrettyTargetValue = Value.isZero() ? "false" : "true";
else
  IntegerValue.toString(PrettyTargetValue);

if (PruneWarnings) {
  S.DiagRuntimeBehavior(E->getExprLoc(), E,
                        S.PDiag(DiagID)
                            << E->getType() << T.getUnqualifiedType()
                            << PrettySourceValue << PrettyTargetValue
                            << E->getSourceRange() << SourceRange(CContext));
} else {
  S.Diag(E->getExprLoc(), DiagID)
      << E->getType() << T.getUnqualifiedType() << PrettySourceValue
      << PrettyTargetValue << E->getSourceRange() << SourceRange(CContext);
}
12231}

12233/// Analyze the given compound assignment for the possible losing of
12234/// floating-point precision.
12235static void AnalyzeCompoundAssignment(Sema &S, BinaryOperator *E) {
assert(isa<CompoundAssignOperator>(E) &&((void)0)
       "Must be compound assignment operation")((void)0);
// Recurse on the LHS and RHS in here
AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());

if (E->getLHS()->getType()->isAtomicType())
  S.Diag(E->getOperatorLoc(), diag::warn_atomic_implicit_seq_cst);

// Now check the outermost expression
const auto *ResultBT = E->getLHS()->getType()->getAs<BuiltinType>();
const auto *RBT = cast<CompoundAssignOperator>(E)
                      ->getComputationResultType()
                      ->getAs<BuiltinType>();

// The below checks assume source is floating point.
if (!ResultBT || !RBT || !RBT->isFloatingPoint()) return;

// If source is floating point but target is an integer.
if (ResultBT->isInteger())
  return DiagnoseImpCast(S, E, E->getRHS()->getType(), E->getLHS()->getType(),
                         E->getExprLoc(), diag::warn_impcast_float_integer);

if (!ResultBT->isFloatingPoint())
  return;

// If both source and target are floating points, warn about losing precision.
int Order = S.getASTContext().getFloatingTypeSemanticOrder(
    QualType(ResultBT, 0), QualType(RBT, 0));
if (Order < 0 && !S.SourceMgr.isInSystemMacro(E->getOperatorLoc()))
  // warn about dropping FP rank.
  DiagnoseImpCast(S, E->getRHS(), E->getLHS()->getType(), E->getOperatorLoc(),
                  diag::warn_impcast_float_result_precision);
12269}

12271static std::string PrettyPrintInRange(const llvm::APSInt &Value,
                                    IntRange Range) {
if (!Range.Width) return "0";

llvm::APSInt ValueInRange = Value;
ValueInRange.setIsSigned(!Range.NonNegative);
ValueInRange = ValueInRange.trunc(Range.Width);
return toString(ValueInRange, 10);
12279}

12281static bool IsImplicitBoolFloatConversion(Sema &S, Expr *Ex, bool ToBool) {
if (!isa<ImplicitCastExpr>(Ex))
  return false;

Expr *InnerE = Ex->IgnoreParenImpCasts();
const Type *Target = S.Context.getCanonicalType(Ex->getType()).getTypePtr();
const Type *Source =
  S.Context.getCanonicalType(InnerE->getType()).getTypePtr();
if (Target->isDependentType())
  return false;

const BuiltinType *FloatCandidateBT =
  dyn_cast<BuiltinType>(ToBool ? Source : Target);
const Type *BoolCandidateType = ToBool ? Target : Source;

return (BoolCandidateType->isSpecificBuiltinType(BuiltinType::Bool) &&
        FloatCandidateBT && (FloatCandidateBT->isFloatingPoint()));
12298}

12300static void CheckImplicitArgumentConversions(Sema &S, CallExpr *TheCall,
                                           SourceLocation CC) {
unsigned NumArgs = TheCall->getNumArgs();
for (unsigned i = 0; i < NumArgs; ++i) {
  Expr *CurrA = TheCall->getArg(i);
  if (!IsImplicitBoolFloatConversion(S, CurrA, true))
    continue;

  bool IsSwapped = ((i > 0) &&
      IsImplicitBoolFloatConversion(S, TheCall->getArg(i - 1), false));
  IsSwapped |= ((i < (NumArgs - 1)) &&
      IsImplicitBoolFloatConversion(S, TheCall->getArg(i + 1), false));
  if (IsSwapped) {
    // Warn on this floating-point to bool conversion.
    DiagnoseImpCast(S, CurrA->IgnoreParenImpCasts(),
                    CurrA->getType(), CC,
                    diag::warn_impcast_floating_point_to_bool);
  }
}
12319}

12321static void DiagnoseNullConversion(Sema &S, Expr *E, QualType T,
                                 SourceLocation CC) {
if (S.Diags.isIgnored(diag::warn_impcast_null_pointer_to_integer,
                      E->getExprLoc()))
  return;

// Don't warn on functions which have return type nullptr_t.
if (isa<CallExpr>(E))
  return;

// Check for NULL (GNUNull) or nullptr (CXX11_nullptr).
const Expr::NullPointerConstantKind NullKind =
    E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull);
if (NullKind != Expr::NPCK_GNUNull && NullKind != Expr::NPCK_CXX11_nullptr)
  return;

// Return if target type is a safe conversion.
if (T->isAnyPointerType() || T->isBlockPointerType() ||
    T->isMemberPointerType() || !T->isScalarType() || T->isNullPtrType())
  return;

SourceLocation Loc = E->getSourceRange().getBegin();

// Venture through the macro stacks to get to the source of macro arguments.
// The new location is a better location than the complete location that was
// passed in.
Loc = S.SourceMgr.getTopMacroCallerLoc(Loc);
CC = S.SourceMgr.getTopMacroCallerLoc(CC);

// __null is usually wrapped in a macro.  Go up a macro if that is the case.
if (NullKind == Expr::NPCK_GNUNull && Loc.isMacroID()) {
  StringRef MacroName = Lexer::getImmediateMacroNameForDiagnostics(
      Loc, S.SourceMgr, S.getLangOpts());
  if (MacroName == "NULL")
    Loc = S.SourceMgr.getImmediateExpansionRange(Loc).getBegin();
}

// Only warn if the null and context location are in the same macro expansion.
if (S.SourceMgr.getFileID(Loc) != S.SourceMgr.getFileID(CC))
  return;

S.Diag(Loc, diag::warn_impcast_null_pointer_to_integer)
    << (NullKind == Expr::NPCK_CXX11_nullptr) << T << SourceRange(CC)
    << FixItHint::CreateReplacement(Loc,
                                    S.getFixItZeroLiteralForType(T, Loc));
12366}

12368static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
                                ObjCArrayLiteral *ArrayLiteral);

12371static void
12372checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
                         ObjCDictionaryLiteral *DictionaryLiteral);

12375/// Check a single element within a collection literal against the
12376/// target element type.
12377static void checkObjCCollectionLiteralElement(Sema &S,
                                            QualType TargetElementType,
                                            Expr *Element,
                                            unsigned ElementKind) {
// Skip a bitcast to 'id' or qualified 'id'.
if (auto ICE = dyn_cast<ImplicitCastExpr>(Element)) {
  if (ICE->getCastKind() == CK_BitCast &&
      ICE->getSubExpr()->getType()->getAs<ObjCObjectPointerType>())
    Element = ICE->getSubExpr();
}

QualType ElementType = Element->getType();
ExprResult ElementResult(Element);
if (ElementType->getAs<ObjCObjectPointerType>() &&
    S.CheckSingleAssignmentConstraints(TargetElementType,
                                       ElementResult,
                                       false, false)
      != Sema::Compatible) {
  S.Diag(Element->getBeginLoc(), diag::warn_objc_collection_literal_element)
      << ElementType << ElementKind << TargetElementType
      << Element->getSourceRange();
}

if (auto ArrayLiteral = dyn_cast<ObjCArrayLiteral>(Element))
  checkObjCArrayLiteral(S, TargetElementType, ArrayLiteral);
else if (auto DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(Element))
  checkObjCDictionaryLiteral(S, TargetElementType, DictionaryLiteral);
12404}

12406/// Check an Objective-C array literal being converted to the given
12407/// target type.
12408static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
                                ObjCArrayLiteral *ArrayLiteral) {
if (!S.NSArrayDecl)
  return;

const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
if (!TargetObjCPtr)
  return;

if (TargetObjCPtr->isUnspecialized() ||
    TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
      != S.NSArrayDecl->getCanonicalDecl())
  return;

auto TypeArgs = TargetObjCPtr->getTypeArgs();
if (TypeArgs.size() != 1)
  return;

QualType TargetElementType = TypeArgs[0];
for (unsigned I = 0, N = ArrayLiteral->getNumElements(); I != N; ++I) {
  checkObjCCollectionLiteralElement(S, TargetElementType,
                                    ArrayLiteral->getElement(I),
                                    0);
}
12432}

12434/// Check an Objective-C dictionary literal being converted to the given
12435/// target type.
12436static void
12437checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
                         ObjCDictionaryLiteral *DictionaryLiteral) {
if (!S.NSDictionaryDecl)
  return;

const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
if (!TargetObjCPtr)
  return;

if (TargetObjCPtr->isUnspecialized() ||
    TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
      != S.NSDictionaryDecl->getCanonicalDecl())
  return;

auto TypeArgs = TargetObjCPtr->getTypeArgs();
if (TypeArgs.size() != 2)
  return;

QualType TargetKeyType = TypeArgs[0];
QualType TargetObjectType = TypeArgs[1];
for (unsigned I = 0, N = DictionaryLiteral->getNumElements(); I != N; ++I) {
  auto Element = DictionaryLiteral->getKeyValueElement(I);
  checkObjCCollectionLiteralElement(S, TargetKeyType, Element.Key, 1);
  checkObjCCollectionLiteralElement(S, TargetObjectType, Element.Value, 2);
}
12462}

12464// Helper function to filter out cases for constant width constant conversion.
12465// Don't warn on char array initialization or for non-decimal values.
12466static bool isSameWidthConstantConversion(Sema &S, Expr *E, QualType T,
                                        SourceLocation CC) {
// If initializing from a constant, and the constant starts with '0',
// then it is a binary, octal, or hexadecimal.  Allow these constants
// to fill all the bits, even if there is a sign change.
if (auto *IntLit = dyn_cast<IntegerLiteral>(E->IgnoreParenImpCasts())) {
  const char FirstLiteralCharacter =
      S.getSourceManager().getCharacterData(IntLit->getBeginLoc())[0];
  if (FirstLiteralCharacter == '0')
    return false;
}

// If the CC location points to a '{', and the type is char, then assume
// assume it is an array initialization.
if (CC.isValid() && T->isCharType()) {
  const char FirstContextCharacter =
      S.getSourceManager().getCharacterData(CC)[0];
  if (FirstContextCharacter == '{')
    return false;
}

return true;
12488}

12490static const IntegerLiteral *getIntegerLiteral(Expr *E) {
const auto *IL = dyn_cast<IntegerLiteral>(E);
if (!IL) {
  if (auto *UO = dyn_cast<UnaryOperator>(E)) {
    if (UO->getOpcode() == UO_Minus)
      return dyn_cast<IntegerLiteral>(UO->getSubExpr());
  }
}

return IL;
12500}

12502static void DiagnoseIntInBoolContext(Sema &S, Expr *E) {
E = E->IgnoreParenImpCasts();
SourceLocation ExprLoc = E->getExprLoc();

if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
  BinaryOperator::Opcode Opc = BO->getOpcode();
  Expr::EvalResult Result;
  // Do not diagnose unsigned shifts.
  if (Opc == BO_Shl) {
    const auto *LHS = getIntegerLiteral(BO->getLHS());
    const auto *RHS = getIntegerLiteral(BO->getRHS());
    if (LHS && LHS->getValue() == 0)
      S.Diag(ExprLoc, diag::warn_left_shift_always) << 0;
    else if (!E->isValueDependent() && LHS && RHS &&
             RHS->getValue().isNonNegative() &&
             E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects))
      S.Diag(ExprLoc, diag::warn_left_shift_always)
          << (Result.Val.getInt() != 0);
    else if (E->getType()->isSignedIntegerType())
      S.Diag(ExprLoc, diag::warn_left_shift_in_bool_context) << E;
  }
}

if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
  const auto *LHS = getIntegerLiteral(CO->getTrueExpr());
  const auto *RHS = getIntegerLiteral(CO->getFalseExpr());
  if (!LHS || !RHS)
    return;
  if ((LHS->getValue() == 0 || LHS->getValue() == 1) &&
      (RHS->getValue() == 0 || RHS->getValue() == 1))
    // Do not diagnose common idioms.
    return;
  if (LHS->getValue() != 0 && RHS->getValue() != 0)
    S.Diag(ExprLoc, diag::warn_integer_constants_in_conditional_always_true);
}
12537}

12539static void CheckImplicitConversion(Sema &S, Expr *E, QualType T,
                                  SourceLocation CC,
                                  bool *ICContext = nullptr,
                                  bool IsListInit = false) {
if (E->isTypeDependent() || E->isValueDependent()) return;

const Type *Source = S.Context.getCanonicalType(E->getType()).getTypePtr();
const Type *Target = S.Context.getCanonicalType(T).getTypePtr();
if (Source == Target) return;
if (Target->isDependentType()) return;

// If the conversion context location is invalid don't complain. We also
// don't want to emit a warning if the issue occurs from the expansion of
// a system macro. The problem is that 'getSpellingLoc()' is slow, so we
// delay this check as long as possible. Once we detect we are in that
// scenario, we just return.
if (CC.isInvalid())
  return;

if (Source->isAtomicType())
  S.Diag(E->getExprLoc(), diag::warn_atomic_implicit_seq_cst);

// Diagnose implicit casts to bool.
if (Target->isSpecificBuiltinType(BuiltinType::Bool)) {
  if (isa<StringLiteral>(E))
    // Warn on string literal to bool.  Checks for string literals in logical
    // and expressions, for instance, assert(0 && "error here"), are
    // prevented by a check in AnalyzeImplicitConversions().
    return DiagnoseImpCast(S, E, T, CC,
                           diag::warn_impcast_string_literal_to_bool);
  if (isa<ObjCStringLiteral>(E) || isa<ObjCArrayLiteral>(E) ||
      isa<ObjCDictionaryLiteral>(E) || isa<ObjCBoxedExpr>(E)) {
    // This covers the literal expressions that evaluate to Objective-C
    // objects.
    return DiagnoseImpCast(S, E, T, CC,
                           diag::warn_impcast_objective_c_literal_to_bool);
  }
  if (Source->isPointerType() || Source->canDecayToPointerType()) {
    // Warn on pointer to bool conversion that is always true.
    S.DiagnoseAlwaysNonNullPointer(E, Expr::NPCK_NotNull, /*IsEqual*/ false,
                                   SourceRange(CC));
  }
}

// If the we're converting a constant to an ObjC BOOL on a platform where BOOL
// is a typedef for signed char (macOS), then that constant value has to be 1
// or 0.
if (isObjCSignedCharBool(S, T) && Source->isIntegralType(S.Context)) {
  Expr::EvalResult Result;
  if (E->EvaluateAsInt(Result, S.getASTContext(),
                       Expr::SE_AllowSideEffects)) {
    if (Result.Val.getInt() != 1 && Result.Val.getInt() != 0) {
      adornObjCBoolConversionDiagWithTernaryFixit(
          S, E,
          S.Diag(CC, diag::warn_impcast_constant_value_to_objc_bool)
              << toString(Result.Val.getInt(), 10));
    }
    return;
  }
}

// Check implicit casts from Objective-C collection literals to specialized
// collection types, e.g., NSArray<NSString *> *.
if (auto *ArrayLiteral = dyn_cast<ObjCArrayLiteral>(E))
  checkObjCArrayLiteral(S, QualType(Target, 0), ArrayLiteral);
else if (auto *DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(E))
  checkObjCDictionaryLiteral(S, QualType(Target, 0), DictionaryLiteral);

// Strip vector types.
if (isa<VectorType>(Source)) {
  if (Target->isVLSTBuiltinType() &&
      (S.Context.areCompatibleSveTypes(QualType(Target, 0),
                                       QualType(Source, 0)) ||
       S.Context.areLaxCompatibleSveTypes(QualType(Target, 0),
                                          QualType(Source, 0))))
    return;

  if (!isa<VectorType>(Target)) {
    if (S.SourceMgr.isInSystemMacro(CC))
      return;
    return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_vector_scalar);
  }

  // If the vector cast is cast between two vectors of the same size, it is
  // a bitcast, not a conversion.
  if (S.Context.getTypeSize(Source) == S.Context.getTypeSize(Target))
    return;

  Source = cast<VectorType>(Source)->getElementType().getTypePtr();
  Target = cast<VectorType>(Target)->getElementType().getTypePtr();
}
if (auto VecTy = dyn_cast<VectorType>(Target))
  Target = VecTy->getElementType().getTypePtr();

// Strip complex types.
if (isa<ComplexType>(Source)) {
  if (!isa<ComplexType>(Target)) {
    if (S.SourceMgr.isInSystemMacro(CC) || Target->isBooleanType())
      return;

    return DiagnoseImpCast(S, E, T, CC,
                           S.getLangOpts().CPlusPlus
                               ? diag::err_impcast_complex_scalar
                               : diag::warn_impcast_complex_scalar);
  }

  Source = cast<ComplexType>(Source)->getElementType().getTypePtr();
  Target = cast<ComplexType>(Target)->getElementType().getTypePtr();
}

const BuiltinType *SourceBT = dyn_cast<BuiltinType>(Source);
const BuiltinType *TargetBT = dyn_cast<BuiltinType>(Target);

// If the source is floating point...
if (SourceBT && SourceBT->isFloatingPoint()) {
  // ...and the target is floating point...
  if (TargetBT && TargetBT->isFloatingPoint()) {
    // ...then warn if we're dropping FP rank.

    int Order = S.getASTContext().getFloatingTypeSemanticOrder(
        QualType(SourceBT, 0), QualType(TargetBT, 0));
    if (Order > 0) {
      // Don't warn about float constants that are precisely
      // representable in the target type.
      Expr::EvalResult result;
      if (E->EvaluateAsRValue(result, S.Context)) {
        // Value might be a float, a float vector, or a float complex.
        if (IsSameFloatAfterCast(result.Val,
                 S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)),
                 S.Context.getFloatTypeSemantics(QualType(SourceBT, 0))))
          return;
      }

      if (S.SourceMgr.isInSystemMacro(CC))
        return;

      DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_precision);
    }
    // ... or possibly if we're increasing rank, too
    else if (Order < 0) {
      if (S.SourceMgr.isInSystemMacro(CC))
        return;

      DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion);
    }
    return;
  }

  // If the target is integral, always warn.
  if (TargetBT && TargetBT->isInteger()) {
    if (S.SourceMgr.isInSystemMacro(CC))
      return;

    DiagnoseFloatingImpCast(S, E, T, CC);
  }

  // Detect the case where a call result is converted from floating-point to
  // to bool, and the final argument to the call is converted from bool, to
  // discover this typo:
  //
  //    bool b = fabs(x < 1.0);  // should be "bool b = fabs(x) < 1.0;"
  //
  // FIXME: This is an incredibly special case; is there some more general
  // way to detect this class of misplaced-parentheses bug?
  if (Target->isBooleanType() && isa<CallExpr>(E)) {
    // Check last argument of function call to see if it is an
    // implicit cast from a type matching the type the result
    // is being cast to.
    CallExpr *CEx = cast<CallExpr>(E);
    if (unsigned NumArgs = CEx->getNumArgs()) {
      Expr *LastA = CEx->getArg(NumArgs - 1);
      Expr *InnerE = LastA->IgnoreParenImpCasts();
      if (isa<ImplicitCastExpr>(LastA) &&
          InnerE->getType()->isBooleanType()) {
        // Warn on this floating-point to bool conversion
        DiagnoseImpCast(S, E, T, CC,
                        diag::warn_impcast_floating_point_to_bool);
      }
    }
  }
  return;
}

// Valid casts involving fixed point types should be accounted for here.
if (Source->isFixedPointType()) {
  if (Target->isUnsaturatedFixedPointType()) {
    Expr::EvalResult Result;
    if (E->EvaluateAsFixedPoint(Result, S.Context, Expr::SE_AllowSideEffects,
                                S.isConstantEvaluated())) {
      llvm::APFixedPoint Value = Result.Val.getFixedPoint();
      llvm::APFixedPoint MaxVal = S.Context.getFixedPointMax(T);
      llvm::APFixedPoint MinVal = S.Context.getFixedPointMin(T);
      if (Value > MaxVal || Value < MinVal) {
        S.DiagRuntimeBehavior(E->getExprLoc(), E,
                              S.PDiag(diag::warn_impcast_fixed_point_range)
                                  << Value.toString() << T
                                  << E->getSourceRange()
                                  << clang::SourceRange(CC));
        return;
      }
    }
  } else if (Target->isIntegerType()) {
    Expr::EvalResult Result;
    if (!S.isConstantEvaluated() &&
        E->EvaluateAsFixedPoint(Result, S.Context,
                                Expr::SE_AllowSideEffects)) {
      llvm::APFixedPoint FXResult = Result.Val.getFixedPoint();

      bool Overflowed;
      llvm::APSInt IntResult = FXResult.convertToInt(
          S.Context.getIntWidth(T),
          Target->isSignedIntegerOrEnumerationType(), &Overflowed);

      if (Overflowed) {
        S.DiagRuntimeBehavior(E->getExprLoc(), E,
                              S.PDiag(diag::warn_impcast_fixed_point_range)
                                  << FXResult.toString() << T
                                  << E->getSourceRange()
                                  << clang::SourceRange(CC));
        return;
      }
    }
  }
} else if (Target->isUnsaturatedFixedPointType()) {
  if (Source->isIntegerType()) {
    Expr::EvalResult Result;
    if (!S.isConstantEvaluated() &&
        E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects)) {
      llvm::APSInt Value = Result.Val.getInt();

      bool Overflowed;
      llvm::APFixedPoint IntResult = llvm::APFixedPoint::getFromIntValue(
          Value, S.Context.getFixedPointSemantics(T), &Overflowed);

      if (Overflowed) {
        S.DiagRuntimeBehavior(E->getExprLoc(), E,
                              S.PDiag(diag::warn_impcast_fixed_point_range)
                                  << toString(Value, /*Radix=*/10) << T
                                  << E->getSourceRange()
                                  << clang::SourceRange(CC));
        return;
      }
    }
  }
}

// If we are casting an integer type to a floating point type without
// initialization-list syntax, we might lose accuracy if the floating
// point type has a narrower significand than the integer type.
if (SourceBT && TargetBT && SourceBT->isIntegerType() &&
    TargetBT->isFloatingType() && !IsListInit) {
  // Determine the number of precision bits in the source integer type.
  IntRange SourceRange = GetExprRange(S.Context, E, S.isConstantEvaluated(),
                                      /*Approximate*/ true);
  unsigned int SourcePrecision = SourceRange.Width;

  // Determine the number of precision bits in the
  // target floating point type.
  unsigned int TargetPrecision = llvm::APFloatBase::semanticsPrecision(
      S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)));

  if (SourcePrecision > 0 && TargetPrecision > 0 &&
      SourcePrecision > TargetPrecision) {

    if (Optional<llvm::APSInt> SourceInt =
            E->getIntegerConstantExpr(S.Context)) {
      // If the source integer is a constant, convert it to the target
      // floating point type. Issue a warning if the value changes
      // during the whole conversion.
      llvm::APFloat TargetFloatValue(
          S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)));
      llvm::APFloat::opStatus ConversionStatus =
          TargetFloatValue.convertFromAPInt(
              *SourceInt, SourceBT->isSignedInteger(),
              llvm::APFloat::rmNearestTiesToEven);

      if (ConversionStatus != llvm::APFloat::opOK) {
        SmallString<32> PrettySourceValue;
        SourceInt->toString(PrettySourceValue, 10);
        SmallString<32> PrettyTargetValue;
        TargetFloatValue.toString(PrettyTargetValue, TargetPrecision);

        S.DiagRuntimeBehavior(
            E->getExprLoc(), E,
            S.PDiag(diag::warn_impcast_integer_float_precision_constant)
                << PrettySourceValue << PrettyTargetValue << E->getType() << T
                << E->getSourceRange() << clang::SourceRange(CC));
      }
    } else {
      // Otherwise, the implicit conversion may lose precision.
      DiagnoseImpCast(S, E, T, CC,
                      diag::warn_impcast_integer_float_precision);
    }
  }
}

DiagnoseNullConversion(S, E, T, CC);

S.DiscardMisalignedMemberAddress(Target, E);

if (Target->isBooleanType())
  DiagnoseIntInBoolContext(S, E);

if (!Source->isIntegerType() || !Target->isIntegerType())
  return;

// TODO: remove this early return once the false positives for constant->bool
// in templates, macros, etc, are reduced or removed.
if (Target->isSpecificBuiltinType(BuiltinType::Bool))
  return;

if (isObjCSignedCharBool(S, T) && !Source->isCharType() &&
    !E->isKnownToHaveBooleanValue(/*Semantic=*/false)) {
  return adornObjCBoolConversionDiagWithTernaryFixit(
      S, E,
      S.Diag(CC, diag::warn_impcast_int_to_objc_signed_char_bool)
          << E->getType());
}

IntRange SourceTypeRange =
    IntRange::forTargetOfCanonicalType(S.Context, Source);
IntRange LikelySourceRange =
    GetExprRange(S.Context, E, S.isConstantEvaluated(), /*Approximate*/ true);
IntRange TargetRange = IntRange::forTargetOfCanonicalType(S.Context, Target);

if (LikelySourceRange.Width > TargetRange.Width) {
  // If the source is a constant, use a default-on diagnostic.
  // TODO: this should happen for bitfield stores, too.
  Expr::EvalResult Result;
  if (E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects,
                       S.isConstantEvaluated())) {
    llvm::APSInt Value(32);
    Value = Result.Val.getInt();

    if (S.SourceMgr.isInSystemMacro(CC))
      return;

    std::string PrettySourceValue = toString(Value, 10);
    std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);

    S.DiagRuntimeBehavior(
        E->getExprLoc(), E,
        S.PDiag(diag::warn_impcast_integer_precision_constant)
            << PrettySourceValue << PrettyTargetValue << E->getType() << T
            << E->getSourceRange() << SourceRange(CC));
    return;
  }

  // People want to build with -Wshorten-64-to-32 and not -Wconversion.
  if (S.SourceMgr.isInSystemMacro(CC))
    return;

  if (TargetRange.Width == 32 && S.Context.getIntWidth(E->getType()) == 64)
    return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32,
                           /* pruneControlFlow */ true);
  return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision);
}

if (TargetRange.Width > SourceTypeRange.Width) {
  if (auto *UO = dyn_cast<UnaryOperator>(E))
    if (UO->getOpcode() == UO_Minus)
      if (Source->isUnsignedIntegerType()) {
        if (Target->isUnsignedIntegerType())
          return DiagnoseImpCast(S, E, T, CC,
                                 diag::warn_impcast_high_order_zero_bits);
        if (Target->isSignedIntegerType())
          return DiagnoseImpCast(S, E, T, CC,
                                 diag::warn_impcast_nonnegative_result);
      }
}

if (TargetRange.Width == LikelySourceRange.Width &&
    !TargetRange.NonNegative && LikelySourceRange.NonNegative &&
    Source->isSignedIntegerType()) {
  // Warn when doing a signed to signed conversion, warn if the positive
  // source value is exactly the width of the target type, which will
  // cause a negative value to be stored.

  Expr::EvalResult Result;
  if (E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects) &&
      !S.SourceMgr.isInSystemMacro(CC)) {
    llvm::APSInt Value = Result.Val.getInt();
    if (isSameWidthConstantConversion(S, E, T, CC)) {
      std::string PrettySourceValue = toString(Value, 10);
      std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);

      S.DiagRuntimeBehavior(
          E->getExprLoc(), E,
          S.PDiag(diag::warn_impcast_integer_precision_constant)
              << PrettySourceValue << PrettyTargetValue << E->getType() << T
              << E->getSourceRange() << SourceRange(CC));
      return;
    }
  }

  // Fall through for non-constants to give a sign conversion warning.
}

if ((TargetRange.NonNegative && !LikelySourceRange.NonNegative) ||
    (!TargetRange.NonNegative && LikelySourceRange.NonNegative &&
     LikelySourceRange.Width == TargetRange.Width)) {
  if (S.SourceMgr.isInSystemMacro(CC))
    return;

  unsigned DiagID = diag::warn_impcast_integer_sign;

  // Traditionally, gcc has warned about this under -Wsign-compare.
  // We also want to warn about it in -Wconversion.
  // So if -Wconversion is off, use a completely identical diagnostic
  // in the sign-compare group.
  // The conditional-checking code will
  if (ICContext) {
    DiagID = diag::warn_impcast_integer_sign_conditional;
    *ICContext = true;
  }

  return DiagnoseImpCast(S, E, T, CC, DiagID);
}

// Diagnose conversions between different enumeration types.
// In C, we pretend that the type of an EnumConstantDecl is its enumeration
// type, to give us better diagnostics.
QualType SourceType = E->getType();
if (!S.getLangOpts().CPlusPlus) {
  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
    if (EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(DRE->getDecl())) {
      EnumDecl *Enum = cast<EnumDecl>(ECD->getDeclContext());
      SourceType = S.Context.getTypeDeclType(Enum);
      Source = S.Context.getCanonicalType(SourceType).getTypePtr();
    }
}

if (const EnumType *SourceEnum = Source->getAs<EnumType>())
  if (const EnumType *TargetEnum = Target->getAs<EnumType>())
    if (SourceEnum->getDecl()->hasNameForLinkage() &&
        TargetEnum->getDecl()->hasNameForLinkage() &&
        SourceEnum != TargetEnum) {
      if (S.SourceMgr.isInSystemMacro(CC))
        return;

      return DiagnoseImpCast(S, E, SourceType, T, CC,
                             diag::warn_impcast_different_enum_types);
    }
12982}

12984static void CheckConditionalOperator(Sema &S, AbstractConditionalOperator *E,
                                   SourceLocation CC, QualType T);

12987static void CheckConditionalOperand(Sema &S, Expr *E, QualType T,
                                  SourceLocation CC, bool &ICContext) {
E = E->IgnoreParenImpCasts();

if (auto *CO = dyn_cast<AbstractConditionalOperator>(E))
  return CheckConditionalOperator(S, CO, CC, T);

AnalyzeImplicitConversions(S, E, CC);
if (E->getType() != T)
  return CheckImplicitConversion(S, E, T, CC, &ICContext);
12997}

12999static void CheckConditionalOperator(Sema &S, AbstractConditionalOperator *E,
                                   SourceLocation CC, QualType T) {
AnalyzeImplicitConversions(S, E->getCond(), E->getQuestionLoc());

Expr *TrueExpr = E->getTrueExpr();
if (auto *BCO = dyn_cast<BinaryConditionalOperator>(E))
  TrueExpr = BCO->getCommon();

bool Suspicious = false;
CheckConditionalOperand(S, TrueExpr, T, CC, Suspicious);
CheckConditionalOperand(S, E->getFalseExpr(), T, CC, Suspicious);

if (T->isBooleanType())
  DiagnoseIntInBoolContext(S, E);

// If -Wconversion would have warned about either of the candidates
// for a signedness conversion to the context type...
if (!Suspicious) return;

// ...but it's currently ignored...
if (!S.Diags.isIgnored(diag::warn_impcast_integer_sign_conditional, CC))
  return;

// ...then check whether it would have warned about either of the
// candidates for a signedness conversion to the condition type.
if (E->getType() == T) return;

Suspicious = false;
CheckImplicitConversion(S, TrueExpr->IgnoreParenImpCasts(),
                        E->getType(), CC, &Suspicious);
if (!Suspicious)
  CheckImplicitConversion(S, E->getFalseExpr()->IgnoreParenImpCasts(),
                          E->getType(), CC, &Suspicious);
13032}

13034/// Check conversion of given expression to boolean.
13035/// Input argument E is a logical expression.
13036static void CheckBoolLikeConversion(Sema &S, Expr *E, SourceLocation CC) {
if (S.getLangOpts().Bool)
  return;
if (E->IgnoreParenImpCasts()->getType()->isAtomicType())
  return;
CheckImplicitConversion(S, E->IgnoreParenImpCasts(), S.Context.BoolTy, CC);
13042}

13044namespace {
13045struct AnalyzeImplicitConversionsWorkItem {
Expr *E;
SourceLocation CC;
bool IsListInit;
13049};
13050}

13052/// Data recursive variant of AnalyzeImplicitConversions. Subexpressions
13053/// that should be visited are added to WorkList.
13054static void AnalyzeImplicitConversions(
  Sema &S, AnalyzeImplicitConversionsWorkItem Item,
  llvm::SmallVectorImpl<AnalyzeImplicitConversionsWorkItem> &WorkList) {
Expr *OrigE = Item.E;
SourceLocation CC = Item.CC;

QualType T = OrigE->getType();
Expr *E = OrigE->IgnoreParenImpCasts();

// Propagate whether we are in a C++ list initialization expression.
// If so, we do not issue warnings for implicit int-float conversion
// precision loss, because C++11 narrowing already handles it.
bool IsListInit = Item.IsListInit ||
                  (isa<InitListExpr>(OrigE) && S.getLangOpts().CPlusPlus);

if (E->isTypeDependent() || E->isValueDependent())
  return;

Expr *SourceExpr = E;
// Examine, but don't traverse into the source expression of an
// OpaqueValueExpr, since it may have multiple parents and we don't want to
// emit duplicate diagnostics. Its fine to examine the form or attempt to
// evaluate it in the context of checking the specific conversion to T though.
if (auto *OVE = dyn_cast<OpaqueValueExpr>(E))
  if (auto *Src = OVE->getSourceExpr())
    SourceExpr = Src;

if (const auto *UO = dyn_cast<UnaryOperator>(SourceExpr))
  if (UO->getOpcode() == UO_Not &&
      UO->getSubExpr()->isKnownToHaveBooleanValue())
    S.Diag(UO->getBeginLoc(), diag::warn_bitwise_negation_bool)
        << OrigE->getSourceRange() << T->isBooleanType()
        << FixItHint::CreateReplacement(UO->getBeginLoc(), "!");

// For conditional operators, we analyze the arguments as if they
// were being fed directly into the output.
if (auto *CO = dyn_cast<AbstractConditionalOperator>(SourceExpr)) {
  CheckConditionalOperator(S, CO, CC, T);
  return;
}

// Check implicit argument conversions for function calls.
if (CallExpr *Call = dyn_cast<CallExpr>(SourceExpr))
  CheckImplicitArgumentConversions(S, Call, CC);

// Go ahead and check any implicit conversions we might have skipped.
// The non-canonical typecheck is just an optimization;
// CheckImplicitConversion will filter out dead implicit conversions.
if (SourceExpr->getType() != T)
  CheckImplicitConversion(S, SourceExpr, T, CC, nullptr, IsListInit);

// Now continue drilling into this expression.

if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
  // The bound subexpressions in a PseudoObjectExpr are not reachable
  // as transitive children.
  // FIXME: Use a more uniform representation for this.
  for (auto *SE : POE->semantics())
    if (auto *OVE = dyn_cast<OpaqueValueExpr>(SE))
      WorkList.push_back({OVE->getSourceExpr(), CC, IsListInit});
}

// Skip past explicit casts.
if (auto *CE = dyn_cast<ExplicitCastExpr>(E)) {
  E = CE->getSubExpr()->IgnoreParenImpCasts();
  if (!CE->getType()->isVoidType() && E->getType()->isAtomicType())
    S.Diag(E->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
  WorkList.push_back({E, CC, IsListInit});
  return;
}

if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
  // Do a somewhat different check with comparison operators.
  if (BO->isComparisonOp())
    return AnalyzeComparison(S, BO);

  // And with simple assignments.
  if (BO->getOpcode() == BO_Assign)
    return AnalyzeAssignment(S, BO);
  // And with compound assignments.
  if (BO->isAssignmentOp())
    return AnalyzeCompoundAssignment(S, BO);
}

// These break the otherwise-useful invariant below.  Fortunately,
// we don't really need to recurse into them, because any internal
// expressions should have been analyzed already when they were
// built into statements.
if (isa<StmtExpr>(E)) return;

// Don't descend into unevaluated contexts.
if (isa<UnaryExprOrTypeTraitExpr>(E)) return;

// Now just recurse over the expression's children.
CC = E->getExprLoc();
BinaryOperator *BO = dyn_cast<BinaryOperator>(E);
bool IsLogicalAndOperator = BO && BO->getOpcode() == BO_LAnd;
for (Stmt *SubStmt : E->children()) {
  Expr *ChildExpr = dyn_cast_or_null<Expr>(SubStmt);
  if (!ChildExpr)
    continue;

  if (IsLogicalAndOperator &&
      isa<StringLiteral>(ChildExpr->IgnoreParenImpCasts()))
    // Ignore checking string literals that are in logical and operators.
    // This is a common pattern for asserts.
    continue;
  WorkList.push_back({ChildExpr, CC, IsListInit});
}

if (BO && BO->isLogicalOp()) {
  Expr *SubExpr = BO->getLHS()->IgnoreParenImpCasts();
  if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
    ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());

  SubExpr = BO->getRHS()->IgnoreParenImpCasts();
  if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
    ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
}

if (const UnaryOperator *U = dyn_cast<UnaryOperator>(E)) {
  if (U->getOpcode() == UO_LNot) {
    ::CheckBoolLikeConversion(S, U->getSubExpr(), CC);
  } else if (U->getOpcode() != UO_AddrOf) {
    if (U->getSubExpr()->getType()->isAtomicType())
      S.Diag(U->getSubExpr()->getBeginLoc(),
             diag::warn_atomic_implicit_seq_cst);
  }
}
13183}

13185/// AnalyzeImplicitConversions - Find and report any interesting
13186/// implicit conversions in the given expression.  There are a couple
13187/// of competing diagnostics here, -Wconversion and -Wsign-compare.
13188static void AnalyzeImplicitConversions(Sema &S, Expr *OrigE, SourceLocation CC,
                                     bool IsListInit/*= false*/) {
llvm::SmallVector<AnalyzeImplicitConversionsWorkItem, 16> WorkList;
WorkList.push_back({OrigE, CC, IsListInit});
while (!WorkList.empty())
  AnalyzeImplicitConversions(S, WorkList.pop_back_val(), WorkList);
13194}

13196/// Diagnose integer type and any valid implicit conversion to it.
13197static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E, const QualType &IntT) {
// Taking into account implicit conversions,
// allow any integer.
if (!E->getType()->isIntegerType()) {
  S.Diag(E->getBeginLoc(),
         diag::err_opencl_enqueue_kernel_invalid_local_size_type);
  return true;
}
// Potentially emit standard warnings for implicit conversions if enabled
// using -Wconversion.
CheckImplicitConversion(S, E, IntT, E->getBeginLoc());
return false;
13209}

13211// Helper function for Sema::DiagnoseAlwaysNonNullPointer.
13212// Returns true when emitting a warning about taking the address of a reference.
13213static bool CheckForReference(Sema &SemaRef, const Expr *E,
                            const PartialDiagnostic &PD) {
E = E->IgnoreParenImpCasts();

const FunctionDecl *FD = nullptr;

if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
  if (!DRE->getDecl()->getType()->isReferenceType())
    return false;
} else if (const MemberExpr *M = dyn_cast<MemberExpr>(E)) {
  if (!M->getMemberDecl()->getType()->isReferenceType())
    return false;
} else if (const CallExpr *Call = dyn_cast<CallExpr>(E)) {
  if (!Call->getCallReturnType(SemaRef.Context)->isReferenceType())
    return false;
  FD = Call->getDirectCallee();
} else {
  return false;
}

SemaRef.Diag(E->getExprLoc(), PD);

// If possible, point to location of function.
if (FD) {
  SemaRef.Diag(FD->getLocation(), diag::note_reference_is_return_value) << FD;
}

return true;
13241}

13243// Returns true if the SourceLocation is expanded from any macro body.
13244// Returns false if the SourceLocation is invalid, is from not in a macro
13245// expansion, or is from expanded from a top-level macro argument.
13246static bool IsInAnyMacroBody(const SourceManager &SM, SourceLocation Loc) {
if (Loc.isInvalid())
  return false;

while (Loc.isMacroID()) {
  if (SM.isMacroBodyExpansion(Loc))
    return true;
  Loc = SM.getImmediateMacroCallerLoc(Loc);
}

return false;
13257}

13259/// Diagnose pointers that are always non-null.
13260/// \param E the expression containing the pointer
13261/// \param NullKind NPCK_NotNull if E is a cast to bool, otherwise, E is
13262/// compared to a null pointer
13263/// \param IsEqual True when the comparison is equal to a null pointer
13264/// \param Range Extra SourceRange to highlight in the diagnostic
13265void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
                                      Expr::NullPointerConstantKind NullKind,
                                      bool IsEqual, SourceRange Range) {
if (!E)
  return;

// Don't warn inside macros.
if (E->getExprLoc().isMacroID()) {
  const SourceManager &SM = getSourceManager();
  if (IsInAnyMacroBody(SM, E->getExprLoc()) ||
      IsInAnyMacroBody(SM, Range.getBegin()))
    return;
}
E = E->IgnoreImpCasts();

const bool IsCompare = NullKind != Expr::NPCK_NotNull;

if (isa<CXXThisExpr>(E)) {
  unsigned DiagID = IsCompare ? diag::warn_this_null_compare
                              : diag::warn_this_bool_conversion;
  Diag(E->getExprLoc(), DiagID) << E->getSourceRange() << Range << IsEqual;
  return;
}

bool IsAddressOf = false;

if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
  if (UO->getOpcode() != UO_AddrOf)
    return;
  IsAddressOf = true;
  E = UO->getSubExpr();
}

if (IsAddressOf) {
  unsigned DiagID = IsCompare
                        ? diag::warn_address_of_reference_null_compare
                        : diag::warn_address_of_reference_bool_conversion;
  PartialDiagnostic PD = PDiag(DiagID) << E->getSourceRange() << Range
                                       << IsEqual;
  if (CheckForReference(*this, E, PD)) {
    return;
  }
}

auto ComplainAboutNonnullParamOrCall = [&](const Attr *NonnullAttr) {
  bool IsParam = isa<NonNullAttr>(NonnullAttr);
  std::string Str;
  llvm::raw_string_ostream S(Str);
  E->printPretty(S, nullptr, getPrintingPolicy());
  unsigned DiagID = IsCompare ? diag::warn_nonnull_expr_compare
                              : diag::warn_cast_nonnull_to_bool;
  Diag(E->getExprLoc(), DiagID) << IsParam << S.str()
    << E->getSourceRange() << Range << IsEqual;
  Diag(NonnullAttr->getLocation(), diag::note_declared_nonnull) << IsParam;
};

// If we have a CallExpr that is tagged with returns_nonnull, we can complain.
if (auto *Call = dyn_cast<CallExpr>(E->IgnoreParenImpCasts())) {
  if (auto *Callee = Call->getDirectCallee()) {
    if (const Attr *A = Callee->getAttr<ReturnsNonNullAttr>()) {
      ComplainAboutNonnullParamOrCall(A);
      return;
    }
  }
}

// Expect to find a single Decl.  Skip anything more complicated.
ValueDecl *D = nullptr;
if (DeclRefExpr *R = dyn_cast<DeclRefExpr>(E)) {
  D = R->getDecl();
} else if (MemberExpr *M = dyn_cast<MemberExpr>(E)) {
  D = M->getMemberDecl();
}

// Weak Decls can be null.
if (!D || D->isWeak())
  return;

// Check for parameter decl with nonnull attribute
if (const auto* PV = dyn_cast<ParmVarDecl>(D)) {
  if (getCurFunction() &&
      !getCurFunction()->ModifiedNonNullParams.count(PV)) {
    if (const Attr *A = PV->getAttr<NonNullAttr>()) {
      ComplainAboutNonnullParamOrCall(A);
      return;
    }

    if (const auto *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
      // Skip function template not specialized yet.
      if (FD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplate)
        return;
      auto ParamIter = llvm::find(FD->parameters(), PV);
      assert(ParamIter != FD->param_end())((void)0);
      unsigned ParamNo = std::distance(FD->param_begin(), ParamIter);

      for (const auto *NonNull : FD->specific_attrs<NonNullAttr>()) {
        if (!NonNull->args_size()) {
            ComplainAboutNonnullParamOrCall(NonNull);
            return;
        }

        for (const ParamIdx &ArgNo : NonNull->args()) {
          if (ArgNo.getASTIndex() == ParamNo) {
            ComplainAboutNonnullParamOrCall(NonNull);
            return;
          }
        }
      }
    }
  }
}

QualType T = D->getType();
const bool IsArray = T->isArrayType();
const bool IsFunction = T->isFunctionType();

// Address of function is used to silence the function warning.
if (IsAddressOf && IsFunction) {
  return;
}

// Found nothing.
if (!IsAddressOf && !IsFunction && !IsArray)
  return;

// Pretty print the expression for the diagnostic.
std::string Str;
llvm::raw_string_ostream S(Str);
E->printPretty(S, nullptr, getPrintingPolicy());

unsigned DiagID = IsCompare ? diag::warn_null_pointer_compare
                            : diag::warn_impcast_pointer_to_bool;
enum {
  AddressOf,
  FunctionPointer,
  ArrayPointer
} DiagType;
if (IsAddressOf)
  DiagType = AddressOf;
else if (IsFunction)
  DiagType = FunctionPointer;
else if (IsArray)
  DiagType = ArrayPointer;
else
  llvm_unreachable("Could not determine diagnostic.")__builtin_unreachable();
Diag(E->getExprLoc(), DiagID) << DiagType << S.str() << E->getSourceRange()
                              << Range << IsEqual;

if (!IsFunction)
  return;

// Suggest '&' to silence the function warning.
Diag(E->getExprLoc(), diag::note_function_warning_silence)
    << FixItHint::CreateInsertion(E->getBeginLoc(), "&");

// Check to see if '()' fixit should be emitted.
QualType ReturnType;
UnresolvedSet<4> NonTemplateOverloads;
tryExprAsCall(*E, ReturnType, NonTemplateOverloads);
if (ReturnType.isNull())
  return;

if (IsCompare) {
  // There are two cases here.  If there is null constant, the only suggest
  // for a pointer return type.  If the null is 0, then suggest if the return
  // type is a pointer or an integer type.
  if (!ReturnType->isPointerType()) {
    if (NullKind == Expr::NPCK_ZeroExpression ||
        NullKind == Expr::NPCK_ZeroLiteral) {
      if (!ReturnType->isIntegerType())
        return;
    } else {
      return;
    }
  }
} else { // !IsCompare
  // For function to bool, only suggest if the function pointer has bool
  // return type.
  if (!ReturnType->isSpecificBuiltinType(BuiltinType::Bool))
    return;
}
Diag(E->getExprLoc(), diag::note_function_to_function_call)
    << FixItHint::CreateInsertion(getLocForEndOfToken(E->getEndLoc()), "()");
13448}

13450/// Diagnoses "dangerous" implicit conversions within the given
13451/// expression (which is a full expression).  Implements -Wconversion
13452/// and -Wsign-compare.
13453///
13454/// \param CC the "context" location of the implicit conversion, i.e.
13455///   the most location of the syntactic entity requiring the implicit
13456///   conversion
13457void Sema::CheckImplicitConversions(Expr *E, SourceLocation CC) {
// Don't diagnose in unevaluated contexts.
if (isUnevaluatedContext())
  return;

// Don't diagnose for value- or type-dependent expressions.
if (E->isTypeDependent() || E->isValueDependent())
  return;

// Check for array bounds violations in cases where the check isn't triggered
// elsewhere for other Expr types (like BinaryOperators), e.g. when an
// ArraySubscriptExpr is on the RHS of a variable initialization.
CheckArrayAccess(E);

// This is not the right CC for (e.g.) a variable initialization.
AnalyzeImplicitConversions(*this, E, CC);
13473}

13475/// CheckBoolLikeConversion - Check conversion of given expression to boolean.
13476/// Input argument E is a logical expression.
13477void Sema::CheckBoolLikeConversion(Expr *E, SourceLocation CC) {
::CheckBoolLikeConversion(*this, E, CC);
13479}

13481/// Diagnose when expression is an integer constant expression and its evaluation
13482/// results in integer overflow
13483void Sema::CheckForIntOverflow (Expr *E) {
// Use a work list to deal with nested struct initializers.
SmallVector<Expr *, 2> Exprs(1, E);

do {
  Expr *OriginalE = Exprs.pop_back_val();
  Expr *E = OriginalE->IgnoreParenCasts();

  if (isa<BinaryOperator>(E)) {
    E->EvaluateForOverflow(Context);
    continue;
  }

  if (auto InitList = dyn_cast<InitListExpr>(OriginalE))
    Exprs.append(InitList->inits().begin(), InitList->inits().end());
  else if (isa<ObjCBoxedExpr>(OriginalE))
    E->EvaluateForOverflow(Context);
  else if (auto Call = dyn_cast<CallExpr>(E))
    Exprs.append(Call->arg_begin(), Call->arg_end());
  else if (auto Message = dyn_cast<ObjCMessageExpr>(E))
    Exprs.append(Message->arg_begin(), Message->arg_end());
} while (!Exprs.empty());
13505}

13507namespace {

13509/// Visitor for expressions which looks for unsequenced operations on the
13510/// same object.
13511class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
using Base = ConstEvaluatedExprVisitor<SequenceChecker>;

/// A tree of sequenced regions within an expression. Two regions are
/// unsequenced if one is an ancestor or a descendent of the other. When we
/// finish processing an expression with sequencing, such as a comma
/// expression, we fold its tree nodes into its parent, since they are
/// unsequenced with respect to nodes we will visit later.
class SequenceTree {
  struct Value {
    explicit Value(unsigned Parent) : Parent(Parent), Merged(false) {}
    unsigned Parent : 31;
    unsigned Merged : 1;
  };
  SmallVector<Value, 8> Values;

public:
  /// A region within an expression which may be sequenced with respect
  /// to some other region.
  class Seq {
    friend class SequenceTree;

    unsigned Index;

    explicit Seq(unsigned N) : Index(N) {}

  public:
    Seq() : Index(0) {}
  };

  SequenceTree() { Values.push_back(Value(0)); }
  Seq root() const { return Seq(0); }

  /// Create a new sequence of operations, which is an unsequenced
  /// subset of \p Parent. This sequence of operations is sequenced with
  /// respect to other children of \p Parent.
  Seq allocate(Seq Parent) {
    Values.push_back(Value(Parent.Index));
    return Seq(Values.size() - 1);
  }

  /// Merge a sequence of operations into its parent.
  void merge(Seq S) {
    Values[S.Index].Merged = true;
  }

  /// Determine whether two operations are unsequenced. This operation
  /// is asymmetric: \p Cur should be the more recent sequence, and \p Old
  /// should have been merged into its parent as appropriate.
  bool isUnsequenced(Seq Cur, Seq Old) {
    unsigned C = representative(Cur.Index);
    unsigned Target = representative(Old.Index);
    while (C >= Target) {
      if (C == Target)
        return true;
      C = Values[C].Parent;
    }
    return false;
  }

private:
  /// Pick a representative for a sequence.
  unsigned representative(unsigned K) {
    if (Values[K].Merged)
      // Perform path compression as we go.
      return Values[K].Parent = representative(Values[K].Parent);
    return K;
  }
};

/// An object for which we can track unsequenced uses.
using Object = const NamedDecl *;

/// Different flavors of object usage which we track. We only track the
/// least-sequenced usage of each kind.
enum UsageKind {
  /// A read of an object. Multiple unsequenced reads are OK.
  UK_Use,

  /// A modification of an object which is sequenced before the value
  /// computation of the expression, such as ++n in C++.
  UK_ModAsValue,

  /// A modification of an object which is not sequenced before the value
  /// computation of the expression, such as n++.
  UK_ModAsSideEffect,

  UK_Count = UK_ModAsSideEffect + 1
};

/// Bundle together a sequencing region and the expression corresponding
/// to a specific usage. One Usage is stored for each usage kind in UsageInfo.
struct Usage {
  const Expr *UsageExpr;
  SequenceTree::Seq Seq;

  Usage() : UsageExpr(nullptr), Seq() {}
};

struct UsageInfo {
  Usage Uses[UK_Count];

  /// Have we issued a diagnostic for this object already?
  bool Diagnosed;

  UsageInfo() : Uses(), Diagnosed(false) {}
};
using UsageInfoMap = llvm::SmallDenseMap<Object, UsageInfo, 16>;

Sema &SemaRef;

/// Sequenced regions within the expression.
SequenceTree Tree;

/// Declaration modifications and references which we have seen.
UsageInfoMap UsageMap;

/// The region we are currently within.
SequenceTree::Seq Region;

/// Filled in with declarations which were modified as a side-effect
/// (that is, post-increment operations).
SmallVectorImpl<std::pair<Object, Usage>> *ModAsSideEffect = nullptr;

/// Expressions to check later. We defer checking these to reduce
/// stack usage.
SmallVectorImpl<const Expr *> &WorkList;

/// RAII object wrapping the visitation of a sequenced subexpression of an
/// expression. At the end of this process, the side-effects of the evaluation
/// become sequenced with respect to the value computation of the result, so
/// we downgrade any UK_ModAsSideEffect within the evaluation to
/// UK_ModAsValue.
struct SequencedSubexpression {
  SequencedSubexpression(SequenceChecker &Self)
    : Self(Self), OldModAsSideEffect(Self.ModAsSideEffect) {
    Self.ModAsSideEffect = &ModAsSideEffect;
  }

  ~SequencedSubexpression() {
    for (const std::pair<Object, Usage> &M : llvm::reverse(ModAsSideEffect)) {
      // Add a new usage with usage kind UK_ModAsValue, and then restore
      // the previous usage with UK_ModAsSideEffect (thus clearing it if
      // the previous one was empty).
      UsageInfo &UI = Self.UsageMap[M.first];
      auto &SideEffectUsage = UI.Uses[UK_ModAsSideEffect];
      Self.addUsage(M.first, UI, SideEffectUsage.UsageExpr, UK_ModAsValue);
      SideEffectUsage = M.second;
    }
    Self.ModAsSideEffect = OldModAsSideEffect;
  }

  SequenceChecker &Self;
  SmallVector<std::pair<Object, Usage>, 4> ModAsSideEffect;
  SmallVectorImpl<std::pair<Object, Usage>> *OldModAsSideEffect;
};

/// RAII object wrapping the visitation of a subexpression which we might
/// choose to evaluate as a constant. If any subexpression is evaluated and
/// found to be non-constant, this allows us to suppress the evaluation of
/// the outer expression.
class EvaluationTracker {
public:
  EvaluationTracker(SequenceChecker &Self)
      : Self(Self), Prev(Self.EvalTracker) {
    Self.EvalTracker = this;
  }

  ~EvaluationTracker() {
    Self.EvalTracker = Prev;
    if (Prev)
      Prev->EvalOK &= EvalOK;
  }

  bool evaluate(const Expr *E, bool &Result) {
    if (!EvalOK || E->isValueDependent())
      return false;
    EvalOK = E->EvaluateAsBooleanCondition(
        Result, Self.SemaRef.Context, Self.SemaRef.isConstantEvaluated());
    return EvalOK;
  }

private:
  SequenceChecker &Self;
  EvaluationTracker *Prev;
  bool EvalOK = true;
} *EvalTracker = nullptr;

/// Find the object which is produced by the specified expression,
/// if any.
Object getObject(const Expr *E, bool Mod) const {
  E = E->IgnoreParenCasts();
  if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
    if (Mod && (UO->getOpcode() == UO_PreInc || UO->getOpcode() == UO_PreDec))
      return getObject(UO->getSubExpr(), Mod);
  } else if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
    if (BO->getOpcode() == BO_Comma)
      return getObject(BO->getRHS(), Mod);
    if (Mod && BO->isAssignmentOp())
      return getObject(BO->getLHS(), Mod);
  } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
    // FIXME: Check for more interesting cases, like "x.n = ++x.n".
    if (isa<CXXThisExpr>(ME->getBase()->IgnoreParenCasts()))
      return ME->getMemberDecl();
  } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
    // FIXME: If this is a reference, map through to its value.
    return DRE->getDecl();
  return nullptr;
}

/// Note that an object \p O was modified or used by an expression
/// \p UsageExpr with usage kind \p UK. \p UI is the \p UsageInfo for
/// the object \p O as obtained via the \p UsageMap.
void addUsage(Object O, UsageInfo &UI, const Expr *UsageExpr, UsageKind UK) {
  // Get the old usage for the given object and usage kind.
  Usage &U = UI.Uses[UK];
  if (!U.UsageExpr || !Tree.isUnsequenced(Region, U.Seq)) {
    // If we have a modification as side effect and are in a sequenced
    // subexpression, save the old Usage so that we can restore it later
    // in SequencedSubexpression::~SequencedSubexpression.
    if (UK == UK_ModAsSideEffect && ModAsSideEffect)
      ModAsSideEffect->push_back(std::make_pair(O, U));
    // Then record the new usage with the current sequencing region.
    U.UsageExpr = UsageExpr;
    U.Seq = Region;
  }
}

/// Check whether a modification or use of an object \p O in an expression
/// \p UsageExpr conflicts with a prior usage of kind \p OtherKind. \p UI is
/// the \p UsageInfo for the object \p O as obtained via the \p UsageMap.
/// \p IsModMod is true when we are checking for a mod-mod unsequenced
/// usage and false we are checking for a mod-use unsequenced usage.
void checkUsage(Object O, UsageInfo &UI, const Expr *UsageExpr,
                UsageKind OtherKind, bool IsModMod) {
  if (UI.Diagnosed)
    return;

  const Usage &U = UI.Uses[OtherKind];
  if (!U.UsageExpr || !Tree.isUnsequenced(Region, U.Seq))
    return;

  const Expr *Mod = U.UsageExpr;
  const Expr *ModOrUse = UsageExpr;
  if (OtherKind == UK_Use)
    std::swap(Mod, ModOrUse);

  SemaRef.DiagRuntimeBehavior(
      Mod->getExprLoc(), {Mod, ModOrUse},
      SemaRef.PDiag(IsModMod ? diag::warn_unsequenced_mod_mod
                             : diag::warn_unsequenced_mod_use)
          << O << SourceRange(ModOrUse->getExprLoc()));
  UI.Diagnosed = true;
}

// A note on note{Pre, Post}{Use, Mod}:
//
// (It helps to follow the algorithm with an expression such as
//  "((++k)++, k) = k" or "k = (k++, k++)". Both contain unsequenced
//  operations before C++17 and both are well-defined in C++17).
//
// When visiting a node which uses/modify an object we first call notePreUse
// or notePreMod before visiting its sub-expression(s). At this point the
// children of the current node have not yet been visited and so the eventual
// uses/modifications resulting from the children of the current node have not
// been recorded yet.
//
// We then visit the children of the current node. After that notePostUse or
// notePostMod is called. These will 1) detect an unsequenced modification
// as side effect (as in "k++ + k") and 2) add a new usage with the
// appropriate usage kind.
//
// We also have to be careful that some operation sequences modification as
// side effect as well (for example: || or ,). To account for this we wrap
// the visitation of such a sub-expression (for example: the LHS of || or ,)
// with SequencedSubexpression. SequencedSubexpression is an RAII object
// which record usages which are modifications as side effect, and then
// downgrade them (or more accurately restore the previous usage which was a
// modification as side effect) when exiting the scope of the sequenced
// subexpression.

void notePreUse(Object O, const Expr *UseExpr) {
  UsageInfo &UI = UsageMap[O];
  // Uses conflict with other modifications.
  checkUsage(O, UI, UseExpr, /*OtherKind=*/UK_ModAsValue, /*IsModMod=*/false);
}

void notePostUse(Object O, const Expr *UseExpr) {
  UsageInfo &UI = UsageMap[O];
  checkUsage(O, UI, UseExpr, /*OtherKind=*/UK_ModAsSideEffect,
             /*IsModMod=*/false);
  addUsage(O, UI, UseExpr, /*UsageKind=*/UK_Use);
}

void notePreMod(Object O, const Expr *ModExpr) {
  UsageInfo &UI = UsageMap[O];
  // Modifications conflict with other modifications and with uses.
  checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_ModAsValue, /*IsModMod=*/true);
  checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_Use, /*IsModMod=*/false);
}

void notePostMod(Object O, const Expr *ModExpr, UsageKind UK) {
  UsageInfo &UI = UsageMap[O];
  checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_ModAsSideEffect,
             /*IsModMod=*/true);
  addUsage(O, UI, ModExpr, /*UsageKind=*/UK);
}

13819public:
SequenceChecker(Sema &S, const Expr *E,
                SmallVectorImpl<const Expr *> &WorkList)
    : Base(S.Context), SemaRef(S), Region(Tree.root()), WorkList(WorkList) {
  Visit(E);
  // Silence a -Wunused-private-field since WorkList is now unused.
  // TODO: Evaluate if it can be used, and if not remove it.
  (void)this->WorkList;
}

void VisitStmt(const Stmt *S) {
  // Skip all statements which aren't expressions for now.
}

void VisitExpr(const Expr *E) {
  // By default, just recurse to evaluated subexpressions.
  Base::VisitStmt(E);
}

void VisitCastExpr(const CastExpr *E) {
  Object O = Object();
  if (E->getCastKind() == CK_LValueToRValue)
    O = getObject(E->getSubExpr(), false);

  if (O)
    notePreUse(O, E);
  VisitExpr(E);
  if (O)
    notePostUse(O, E);
}

void VisitSequencedExpressions(const Expr *SequencedBefore,
                               const Expr *SequencedAfter) {
  SequenceTree::Seq BeforeRegion = Tree.allocate(Region);
  SequenceTree::Seq AfterRegion = Tree.allocate(Region);
  SequenceTree::Seq OldRegion = Region;

  {
    SequencedSubexpression SeqBefore(*this);
    Region = BeforeRegion;
    Visit(SequencedBefore);
  }

  Region = AfterRegion;
  Visit(SequencedAfter);

  Region = OldRegion;

  Tree.merge(BeforeRegion);
  Tree.merge(AfterRegion);
}

void VisitArraySubscriptExpr(const ArraySubscriptExpr *ASE) {
  // C++17 [expr.sub]p1:
  //   The expression E1[E2] is identical (by definition) to *((E1)+(E2)). The
  //   expression E1 is sequenced before the expression E2.
  if (SemaRef.getLangOpts().CPlusPlus17)
    VisitSequencedExpressions(ASE->getLHS(), ASE->getRHS());
  else {
    Visit(ASE->getLHS());
    Visit(ASE->getRHS());
  }
}

void VisitBinPtrMemD(const BinaryOperator *BO) { VisitBinPtrMem(BO); }
void VisitBinPtrMemI(const BinaryOperator *BO) { VisitBinPtrMem(BO); }
void VisitBinPtrMem(const BinaryOperator *BO) {
  // C++17 [expr.mptr.oper]p4:
  //  Abbreviating pm-expression.*cast-expression as E1.*E2, [...]
  //  the expression E1 is sequenced before the expression E2.
  if (SemaRef.getLangOpts().CPlusPlus17)
    VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
  else {
    Visit(BO->getLHS());
    Visit(BO->getRHS());
  }
}

void VisitBinShl(const BinaryOperator *BO) { VisitBinShlShr(BO); }
void VisitBinShr(const BinaryOperator *BO) { VisitBinShlShr(BO); }
void VisitBinShlShr(const BinaryOperator *BO) {
  // C++17 [expr.shift]p4:
  //  The expression E1 is sequenced before the expression E2.
  if (SemaRef.getLangOpts().CPlusPlus17)
    VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
  else {
    Visit(BO->getLHS());
    Visit(BO->getRHS());
  }
}

void VisitBinComma(const BinaryOperator *BO) {
  // C++11 [expr.comma]p1:
  //   Every value computation and side effect associated with the left
  //   expression is sequenced before every value computation and side
  //   effect associated with the right expression.
  VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
}

void VisitBinAssign(const BinaryOperator *BO) {
  SequenceTree::Seq RHSRegion;
  SequenceTree::Seq LHSRegion;
  if (SemaRef.getLangOpts().CPlusPlus17) {
    RHSRegion = Tree.allocate(Region);
    LHSRegion = Tree.allocate(Region);
  } else {
    RHSRegion = Region;
    LHSRegion = Region;
  }
  SequenceTree::Seq OldRegion = Region;

  // C++11 [expr.ass]p1:
  //  [...] the assignment is sequenced after the value computation
  //  of the right and left operands, [...]
  //
  // so check it before inspecting the operands and update the
  // map afterwards.
  Object O = getObject(BO->getLHS(), /*Mod=*/true);
  if (O)
    notePreMod(O, BO);

  if (SemaRef.getLangOpts().CPlusPlus17) {
    // C++17 [expr.ass]p1:
    //  [...] The right operand is sequenced before the left operand. [...]
    {
      SequencedSubexpression SeqBefore(*this);
      Region = RHSRegion;
      Visit(BO->getRHS());
    }

    Region = LHSRegion;
    Visit(BO->getLHS());

    if (O && isa<CompoundAssignOperator>(BO))
      notePostUse(O, BO);

  } else {
    // C++11 does not specify any sequencing between the LHS and RHS.
    Region = LHSRegion;
    Visit(BO->getLHS());

    if (O && isa<CompoundAssignOperator>(BO))
      notePostUse(O, BO);

    Region = RHSRegion;
    Visit(BO->getRHS());
  }

  // C++11 [expr.ass]p1:
  //  the assignment is sequenced [...] before the value computation of the
  //  assignment expression.
  // C11 6.5.16/3 has no such rule.
  Region = OldRegion;
  if (O)
    notePostMod(O, BO,
                SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
                                                : UK_ModAsSideEffect);
  if (SemaRef.getLangOpts().CPlusPlus17) {
    Tree.merge(RHSRegion);
    Tree.merge(LHSRegion);
  }
}

void VisitCompoundAssignOperator(const CompoundAssignOperator *CAO) {
  VisitBinAssign(CAO);
}

void VisitUnaryPreInc(const UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
void VisitUnaryPreDec(const UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
void VisitUnaryPreIncDec(const UnaryOperator *UO) {
  Object O = getObject(UO->getSubExpr(), true);
  if (!O)
    return VisitExpr(UO);

  notePreMod(O, UO);
  Visit(UO->getSubExpr());
  // C++11 [expr.pre.incr]p1:
  //   the expression ++x is equivalent to x+=1
  notePostMod(O, UO,
              SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
                                              : UK_ModAsSideEffect);
}

void VisitUnaryPostInc(const UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
void VisitUnaryPostDec(const UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
void VisitUnaryPostIncDec(const UnaryOperator *UO) {
  Object O = getObject(UO->getSubExpr(), true);
  if (!O)
    return VisitExpr(UO);

  notePreMod(O, UO);
  Visit(UO->getSubExpr());
  notePostMod(O, UO, UK_ModAsSideEffect);
}

void VisitBinLOr(const BinaryOperator *BO) {
  // C++11 [expr.log.or]p2:
  //  If the second expression is evaluated, every value computation and
  //  side effect associated with the first expression is sequenced before
  //  every value computation and side effect associated with the
  //  second expression.
  SequenceTree::Seq LHSRegion = Tree.allocate(Region);
  SequenceTree::Seq RHSRegion = Tree.allocate(Region);
  SequenceTree::Seq OldRegion = Region;

  EvaluationTracker Eval(*this);
  {
    SequencedSubexpression Sequenced(*this);
    Region = LHSRegion;
    Visit(BO->getLHS());
  }

  // C++11 [expr.log.or]p1:
  //  [...] the second operand is not evaluated if the first operand
  //  evaluates to true.
  bool EvalResult = false;
  bool EvalOK = Eval.evaluate(BO->getLHS(), EvalResult);
  bool ShouldVisitRHS = !EvalOK || (EvalOK && !EvalResult);
  if (ShouldVisitRHS) {
    Region = RHSRegion;
    Visit(BO->getRHS());
  }

  Region = OldRegion;
  Tree.merge(LHSRegion);
  Tree.merge(RHSRegion);
}

void VisitBinLAnd(const BinaryOperator *BO) {
  // C++11 [expr.log.and]p2:
  //  If the second expression is evaluated, every value computation and
  //  side effect associated with the first expression is sequenced before
  //  every value computation and side effect associated with the
  //  second expression.
  SequenceTree::Seq LHSRegion = Tree.allocate(Region);
  SequenceTree::Seq RHSRegion = Tree.allocate(Region);
  SequenceTree::Seq OldRegion = Region;

  EvaluationTracker Eval(*this);
  {
    SequencedSubexpression Sequenced(*this);
    Region = LHSRegion;
    Visit(BO->getLHS());
  }

  // C++11 [expr.log.and]p1:
  //  [...] the second operand is not evaluated if the first operand is false.
  bool EvalResult = false;
  bool EvalOK = Eval.evaluate(BO->getLHS(), EvalResult);
  bool ShouldVisitRHS = !EvalOK || (EvalOK && EvalResult);
  if (ShouldVisitRHS) {
    Region = RHSRegion;
    Visit(BO->getRHS());
  }

  Region = OldRegion;
  Tree.merge(LHSRegion);
  Tree.merge(RHSRegion);
}

void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO) {
  // C++11 [expr.cond]p1:
  //  [...] Every value computation and side effect associated with the first
  //  expression is sequenced before every value computation and side effect
  //  associated with the second or third expression.
  SequenceTree::Seq ConditionRegion = Tree.allocate(Region);

  // No sequencing is specified between the true and false expression.
  // However since exactly one of both is going to be evaluated we can
  // consider them to be sequenced. This is needed to avoid warning on
  // something like "x ? y+= 1 : y += 2;" in the case where we will visit
  // both the true and false expressions because we can't evaluate x.
  // This will still allow us to detect an expression like (pre C++17)
  // "(x ? y += 1 : y += 2) = y".
  //
  // We don't wrap the visitation of the true and false expression with
  // SequencedSubexpression because we don't want to downgrade modifications
  // as side effect in the true and false expressions after the visition
  // is done. (for example in the expression "(x ? y++ : y++) + y" we should
  // not warn between the two "y++", but we should warn between the "y++"
  // and the "y".
  SequenceTree::Seq TrueRegion = Tree.allocate(Region);
  SequenceTree::Seq FalseRegion = Tree.allocate(Region);
  SequenceTree::Seq OldRegion = Region;

  EvaluationTracker Eval(*this);
  {
    SequencedSubexpression Sequenced(*this);
    Region = ConditionRegion;
    Visit(CO->getCond());
  }

  // C++11 [expr.cond]p1:
  // [...] The first expression is contextually converted to bool (Clause 4).
  // It is evaluated and if it is true, the result of the conditional
  // expression is the value of the second expression, otherwise that of the
  // third expression. Only one of the second and third expressions is
  // evaluated. [...]
  bool EvalResult = false;
  bool EvalOK = Eval.evaluate(CO->getCond(), EvalResult);
  bool ShouldVisitTrueExpr = !EvalOK || (EvalOK && EvalResult);
  bool ShouldVisitFalseExpr = !EvalOK || (EvalOK && !EvalResult);
  if (ShouldVisitTrueExpr) {
    Region = TrueRegion;
    Visit(CO->getTrueExpr());
  }
  if (ShouldVisitFalseExpr) {
    Region = FalseRegion;
    Visit(CO->getFalseExpr());
  }

  Region = OldRegion;
  Tree.merge(ConditionRegion);
  Tree.merge(TrueRegion);
  Tree.merge(FalseRegion);
}

void VisitCallExpr(const CallExpr *CE) {
  // FIXME: CXXNewExpr and CXXDeleteExpr implicitly call functions.

  if (CE->isUnevaluatedBuiltinCall(Context))
    return;

  // C++11 [intro.execution]p15:
  //   When calling a function [...], every value computation and side effect
  //   associated with any argument expression, or with the postfix expression
  //   designating the called function, is sequenced before execution of every
  //   expression or statement in the body of the function [and thus before
  //   the value computation of its result].
  SequencedSubexpression Sequenced(*this);
  SemaRef.runWithSufficientStackSpace(CE->getExprLoc(), [&] {
    // C++17 [expr.call]p5
    //   The postfix-expression is sequenced before each expression in the
    //   expression-list and any default argument. [...]
    SequenceTree::Seq CalleeRegion;
    SequenceTree::Seq OtherRegion;
    if (SemaRef.getLangOpts().CPlusPlus17) {
      CalleeRegion = Tree.allocate(Region);
      OtherRegion = Tree.allocate(Region);
    } else {
      CalleeRegion = Region;
      OtherRegion = Region;
    }
    SequenceTree::Seq OldRegion = Region;

    // Visit the callee expression first.
    Region = CalleeRegion;
    if (SemaRef.getLangOpts().CPlusPlus17) {
      SequencedSubexpression Sequenced(*this);
      Visit(CE->getCallee());
    } else {
      Visit(CE->getCallee());
    }

    // Then visit the argument expressions.
    Region = OtherRegion;
    for (const Expr *Argument : CE->arguments())
      Visit(Argument);

    Region = OldRegion;
    if (SemaRef.getLangOpts().CPlusPlus17) {
      Tree.merge(CalleeRegion);
      Tree.merge(OtherRegion);
    }
  });
}

void VisitCXXOperatorCallExpr(const CXXOperatorCallExpr *CXXOCE) {
  // C++17 [over.match.oper]p2:
  //   [...] the operator notation is first transformed to the equivalent
  //   function-call notation as summarized in Table 12 (where @ denotes one
  //   of the operators covered in the specified subclause). However, the
  //   operands are sequenced in the order prescribed for the built-in
  //   operator (Clause 8).
  //
  // From the above only overloaded binary operators and overloaded call
  // operators have sequencing rules in C++17 that we need to handle
  // separately.
  if (!SemaRef.getLangOpts().CPlusPlus17 ||
      (CXXOCE->getNumArgs() != 2 && CXXOCE->getOperator() != OO_Call))
    return VisitCallExpr(CXXOCE);

  enum {
    NoSequencing,
    LHSBeforeRHS,
    RHSBeforeLHS,
    LHSBeforeRest
  } SequencingKind;
  switch (CXXOCE->getOperator()) {
  case OO_Equal:
  case OO_PlusEqual:
  case OO_MinusEqual:
  case OO_StarEqual:
  case OO_SlashEqual:
  case OO_PercentEqual:
  case OO_CaretEqual:
  case OO_AmpEqual:
  case OO_PipeEqual:
  case OO_LessLessEqual:
  case OO_GreaterGreaterEqual:
    SequencingKind = RHSBeforeLHS;
    break;

  case OO_LessLess:
  case OO_GreaterGreater:
  case OO_AmpAmp:
  case OO_PipePipe:
  case OO_Comma:
  case OO_ArrowStar:
  case OO_Subscript:
    SequencingKind = LHSBeforeRHS;
    break;

  case OO_Call:
    SequencingKind = LHSBeforeRest;
    break;

  default:
    SequencingKind = NoSequencing;
    break;
  }

  if (SequencingKind == NoSequencing)
    return VisitCallExpr(CXXOCE);

  // This is a call, so all subexpressions are sequenced before the result.
  SequencedSubexpression Sequenced(*this);

  SemaRef.runWithSufficientStackSpace(CXXOCE->getExprLoc(), [&] {
    assert(SemaRef.getLangOpts().CPlusPlus17 &&((void)0)
           "Should only get there with C++17 and above!")((void)0);
    assert((CXXOCE->getNumArgs() == 2 || CXXOCE->getOperator() == OO_Call) &&((void)0)
           "Should only get there with an overloaded binary operator"((void)0)
           " or an overloaded call operator!")((void)0);

    if (SequencingKind == LHSBeforeRest) {
      assert(CXXOCE->getOperator() == OO_Call &&((void)0)
             "We should only have an overloaded call operator here!")((void)0);

      // This is very similar to VisitCallExpr, except that we only have the
      // C++17 case. The postfix-expression is the first argument of the
      // CXXOperatorCallExpr. The expressions in the expression-list, if any,
      // are in the following arguments.
      //
      // Note that we intentionally do not visit the callee expression since
      // it is just a decayed reference to a function.
      SequenceTree::Seq PostfixExprRegion = Tree.allocate(Region);
      SequenceTree::Seq ArgsRegion = Tree.allocate(Region);
      SequenceTree::Seq OldRegion = Region;

      assert(CXXOCE->getNumArgs() >= 1 &&((void)0)
             "An overloaded call operator must have at least one argument"((void)0)
             " for the postfix-expression!")((void)0);
      const Expr *PostfixExpr = CXXOCE->getArgs()[0];
      llvm::ArrayRef<const Expr *> Args(CXXOCE->getArgs() + 1,
                                        CXXOCE->getNumArgs() - 1);

      // Visit the postfix-expression first.
      {
        Region = PostfixExprRegion;
        SequencedSubexpression Sequenced(*this);
        Visit(PostfixExpr);
      }

      // Then visit the argument expressions.
      Region = ArgsRegion;
      for (const Expr *Arg : Args)
        Visit(Arg);

      Region = OldRegion;
      Tree.merge(PostfixExprRegion);
      Tree.merge(ArgsRegion);
    } else {
      assert(CXXOCE->getNumArgs() == 2 &&((void)0)
             "Should only have two arguments here!")((void)0);
      assert((SequencingKind == LHSBeforeRHS ||((void)0)
              SequencingKind == RHSBeforeLHS) &&((void)0)
             "Unexpected sequencing kind!")((void)0);

      // We do not visit the callee expression since it is just a decayed
      // reference to a function.
      const Expr *E1 = CXXOCE->getArg(0);
      const Expr *E2 = CXXOCE->getArg(1);
      if (SequencingKind == RHSBeforeLHS)
        std::swap(E1, E2);

      return VisitSequencedExpressions(E1, E2);
    }
  });
}

void VisitCXXConstructExpr(const CXXConstructExpr *CCE) {
  // This is a call, so all subexpressions are sequenced before the result.
  SequencedSubexpression Sequenced(*this);

  if (!CCE->isListInitialization())
    return VisitExpr(CCE);

  // In C++11, list initializations are sequenced.
  SmallVector<SequenceTree::Seq, 32> Elts;
  SequenceTree::Seq Parent = Region;
  for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
                                            E = CCE->arg_end();
       I != E; ++I) {
    Region = Tree.allocate(Parent);
    Elts.push_back(Region);
    Visit(*I);
  }

  // Forget that the initializers are sequenced.
  Region = Parent;
  for (unsigned I = 0; I < Elts.size(); ++I)
    Tree.merge(Elts[I]);
}

void VisitInitListExpr(const InitListExpr *ILE) {
  if (!SemaRef.getLangOpts().CPlusPlus11)
    return VisitExpr(ILE);

  // In C++11, list initializations are sequenced.
  SmallVector<SequenceTree::Seq, 32> Elts;
  SequenceTree::Seq Parent = Region;
  for (unsigned I = 0; I < ILE->getNumInits(); ++I) {
    const Expr *E = ILE->getInit(I);
    if (!E)
      continue;
    Region = Tree.allocate(Parent);
    Elts.push_back(Region);
    Visit(E);
  }

  // Forget that the initializers are sequenced.
  Region = Parent;
  for (unsigned I = 0; I < Elts.size(); ++I)
    Tree.merge(Elts[I]);
}
14355};

14357} // namespace

14359void Sema::CheckUnsequencedOperations(const Expr *E) {
SmallVector<const Expr *, 8> WorkList;
WorkList.push_back(E);
while (!WorkList.empty()) {
  const Expr *Item = WorkList.pop_back_val();
  SequenceChecker(*this, Item, WorkList);
}
14366}

14368void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc,
                            bool IsConstexpr) {
llvm::SaveAndRestore<bool> ConstantContext(
    isConstantEvaluatedOverride, IsConstexpr || isa<ConstantExpr>(E));
CheckImplicitConversions(E, CheckLoc);
if (!E->isInstantiationDependent())
  CheckUnsequencedOperations(E);
if (!IsConstexpr && !E->isValueDependent())
  CheckForIntOverflow(E);
DiagnoseMisalignedMembers();
14378}

14380void Sema::CheckBitFieldInitialization(SourceLocation InitLoc,
                                     FieldDecl *BitField,
                                     Expr *Init) {
(void) AnalyzeBitFieldAssignment(*this, BitField, Init, InitLoc);
14384}

14386static void diagnoseArrayStarInParamType(Sema &S, QualType PType,
                                       SourceLocation Loc) {
if (!PType->isVariablyModifiedType())
  return;
if (const auto *PointerTy = dyn_cast<PointerType>(PType)) {
  diagnoseArrayStarInParamType(S, PointerTy->getPointeeType(), Loc);
  return;
}
if (const auto *ReferenceTy = dyn_cast<ReferenceType>(PType)) {
  diagnoseArrayStarInParamType(S, ReferenceTy->getPointeeType(), Loc);
  return;
}
if (const auto *ParenTy = dyn_cast<ParenType>(PType)) {
  diagnoseArrayStarInParamType(S, ParenTy->getInnerType(), Loc);
  return;
}

const ArrayType *AT = S.Context.getAsArrayType(PType);
if (!AT)
  return;

if (AT->getSizeModifier() != ArrayType::Star) {
  diagnoseArrayStarInParamType(S, AT->getElementType(), Loc);
  return;
}

S.Diag(Loc, diag::err_array_star_in_function_definition);
14413}

14415/// CheckParmsForFunctionDef - Check that the parameters of the given
14416/// function are appropriate for the definition of a function. This
14417/// takes care of any checks that cannot be performed on the
14418/// declaration itself, e.g., that the types of each of the function
14419/// parameters are complete.
14420bool Sema::CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
                                  bool CheckParameterNames) {
bool HasInvalidParm = false;
for (ParmVarDecl *Param : Parameters) {
  // C99 6.7.5.3p4: the parameters in a parameter type list in a
  // function declarator that is part of a function definition of
  // that function shall not have incomplete type.
  //
  // This is also C++ [dcl.fct]p6.
  if (!Param->isInvalidDecl() &&
      RequireCompleteType(Param->getLocation(), Param->getType(),
                          diag::err_typecheck_decl_incomplete_type)) {
    Param->setInvalidDecl();
    HasInvalidParm = true;
  }

  // C99 6.9.1p5: If the declarator includes a parameter type list, the
  // declaration of each parameter shall include an identifier.
  if (CheckParameterNames && Param->getIdentifier() == nullptr &&
      !Param->isImplicit() && !getLangOpts().CPlusPlus) {
    // Diagnose this as an extension in C17 and earlier.
    if (!getLangOpts().C2x)
      Diag(Param->getLocation(), diag::ext_parameter_name_omitted_c2x);
  }

  // C99 6.7.5.3p12:
  //   If the function declarator is not part of a definition of that
  //   function, parameters may have incomplete type and may use the [*]
  //   notation in their sequences of declarator specifiers to specify
  //   variable length array types.
  QualType PType = Param->getOriginalType();
  // FIXME: This diagnostic should point the '[*]' if source-location
  // information is added for it.
  diagnoseArrayStarInParamType(*this, PType, Param->getLocation());

  // If the parameter is a c++ class type and it has to be destructed in the
  // callee function, declare the destructor so that it can be called by the
  // callee function. Do not perform any direct access check on the dtor here.
  if (!Param->isInvalidDecl()) {
    if (CXXRecordDecl *ClassDecl = Param->getType()->getAsCXXRecordDecl()) {
      if (!ClassDecl->isInvalidDecl() &&
          !ClassDecl->hasIrrelevantDestructor() &&
          !ClassDecl->isDependentContext() &&
          ClassDecl->isParamDestroyedInCallee()) {
        CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
        MarkFunctionReferenced(Param->getLocation(), Destructor);
        DiagnoseUseOfDecl(Destructor, Param->getLocation());
      }
    }
  }

  // Parameters with the pass_object_size attribute only need to be marked
  // constant at function definitions. Because we lack information about
  // whether we're on a declaration or definition when we're instantiating the
  // attribute, we need to check for constness here.
  if (const auto *Attr = Param->getAttr<PassObjectSizeAttr>())
    if (!Param->getType().isConstQualified())
      Diag(Param->getLocation(), diag::err_attribute_pointers_only)
          << Attr->getSpelling() << 1;

  // Check for parameter names shadowing fields from the class.
  if (LangOpts.CPlusPlus && !Param->isInvalidDecl()) {
    // The owning context for the parameter should be the function, but we
    // want to see if this function's declaration context is a record.
    DeclContext *DC = Param->getDeclContext();
    if (DC && DC->isFunctionOrMethod()) {
      if (auto *RD = dyn_cast<CXXRecordDecl>(DC->getParent()))
        CheckShadowInheritedFields(Param->getLocation(), Param->getDeclName(),
                                   RD, /*DeclIsField*/ false);
    }
  }
}

return HasInvalidParm;
14494}

14496Optional<std::pair<CharUnits, CharUnits>>
14497static getBaseAlignmentAndOffsetFromPtr(const Expr *E, ASTContext &Ctx);

14499/// Compute the alignment and offset of the base class object given the
14500/// derived-to-base cast expression and the alignment and offset of the derived
14501/// class object.
14502static std::pair<CharUnits, CharUnits>
14503getDerivedToBaseAlignmentAndOffset(const CastExpr *CE, QualType DerivedType,
                                 CharUnits BaseAlignment, CharUnits Offset,
                                 ASTContext &Ctx) {
for (auto PathI = CE->path_begin(), PathE = CE->path_end(); PathI != PathE;
     ++PathI) {
  const CXXBaseSpecifier *Base = *PathI;
  const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl();
  if (Base->isVirtual()) {
    // The complete object may have a lower alignment than the non-virtual
    // alignment of the base, in which case the base may be misaligned. Choose
    // the smaller of the non-virtual alignment and BaseAlignment, which is a
    // conservative lower bound of the complete object alignment.
    CharUnits NonVirtualAlignment =
        Ctx.getASTRecordLayout(BaseDecl).getNonVirtualAlignment();
    BaseAlignment = std::min(BaseAlignment, NonVirtualAlignment);
    Offset = CharUnits::Zero();
  } else {
    const ASTRecordLayout &RL =
        Ctx.getASTRecordLayout(DerivedType->getAsCXXRecordDecl());
    Offset += RL.getBaseClassOffset(BaseDecl);
  }
  DerivedType = Base->getType();
}

return std::make_pair(BaseAlignment, Offset);
14528}

14530/// Compute the alignment and offset of a binary additive operator.
14531static Optional<std::pair<CharUnits, CharUnits>>
14532getAlignmentAndOffsetFromBinAddOrSub(const Expr *PtrE, const Expr *IntE,
                                   bool IsSub, ASTContext &Ctx) {
QualType PointeeType = PtrE->getType()->getPointeeType();

if (!PointeeType->isConstantSizeType())
  return llvm::None;

auto P = getBaseAlignmentAndOffsetFromPtr(PtrE, Ctx);

if (!P)
  return llvm::None;

CharUnits EltSize = Ctx.getTypeSizeInChars(PointeeType);
if (Optional<llvm::APSInt> IdxRes = IntE->getIntegerConstantExpr(Ctx)) {
  CharUnits Offset = EltSize * IdxRes->getExtValue();
  if (IsSub)
    Offset = -Offset;
  return std::make_pair(P->first, P->second + Offset);
}

// If the integer expression isn't a constant expression, compute the lower
// bound of the alignment using the alignment and offset of the pointer
// expression and the element size.
return std::make_pair(
    P->first.alignmentAtOffset(P->second).alignmentAtOffset(EltSize),
    CharUnits::Zero());
14558}

14560/// This helper function takes an lvalue expression and returns the alignment of
14561/// a VarDecl and a constant offset from the VarDecl.
14562Optional<std::pair<CharUnits, CharUnits>>
14563static getBaseAlignmentAndOffsetFromLValue(const Expr *E, ASTContext &Ctx) {
E = E->IgnoreParens();
switch (E->getStmtClass()) {
default:
  break;
case Stmt::CStyleCastExprClass:
case Stmt::CXXStaticCastExprClass:
case Stmt::ImplicitCastExprClass: {
  auto *CE = cast<CastExpr>(E);
  const Expr *From = CE->getSubExpr();
  switch (CE->getCastKind()) {
  default:
    break;
  case CK_NoOp:
    return getBaseAlignmentAndOffsetFromLValue(From, Ctx);
  case CK_UncheckedDerivedToBase:
  case CK_DerivedToBase: {
    auto P = getBaseAlignmentAndOffsetFromLValue(From, Ctx);
    if (!P)
      break;
    return getDerivedToBaseAlignmentAndOffset(CE, From->getType(), P->first,
                                              P->second, Ctx);
  }
  }
  break;
}
case Stmt::ArraySubscriptExprClass: {
  auto *ASE = cast<ArraySubscriptExpr>(E);
  return getAlignmentAndOffsetFromBinAddOrSub(ASE->getBase(), ASE->getIdx(),
                                              false, Ctx);
}
case Stmt::DeclRefExprClass: {
  if (auto *VD = dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) {
    // FIXME: If VD is captured by copy or is an escaping __block variable,
    // use the alignment of VD's type.
    if (!VD->getType()->isReferenceType())
      return std::make_pair(Ctx.getDeclAlign(VD), CharUnits::Zero());
    if (VD->hasInit())
      return getBaseAlignmentAndOffsetFromLValue(VD->getInit(), Ctx);
  }
  break;
}
case Stmt::MemberExprClass: {
  auto *ME = cast<MemberExpr>(E);
  auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
  if (!FD || FD->getType()->isReferenceType() ||
      FD->getParent()->isInvalidDecl())
    break;
  Optional<std::pair<CharUnits, CharUnits>> P;
  if (ME->isArrow())
    P = getBaseAlignmentAndOffsetFromPtr(ME->getBase(), Ctx);
  else
    P = getBaseAlignmentAndOffsetFromLValue(ME->getBase(), Ctx);
  if (!P)
    break;
  const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(FD->getParent());
  uint64_t Offset = Layout.getFieldOffset(FD->getFieldIndex());
  return std::make_pair(P->first,
                        P->second + CharUnits::fromQuantity(Offset));
}
case Stmt::UnaryOperatorClass: {
  auto *UO = cast<UnaryOperator>(E);
  switch (UO->getOpcode()) {
  default:
    break;
  case UO_Deref:
    return getBaseAlignmentAndOffsetFromPtr(UO->getSubExpr(), Ctx);
  }
  break;
}
case Stmt::BinaryOperatorClass: {
  auto *BO = cast<BinaryOperator>(E);
  auto Opcode = BO->getOpcode();
  switch (Opcode) {
  default:
    break;
  case BO_Comma:
    return getBaseAlignmentAndOffsetFromLValue(BO->getRHS(), Ctx);
  }
  break;
}
}
return llvm::None;
14646}

14648/// This helper function takes a pointer expression and returns the alignment of
14649/// a VarDecl and a constant offset from the VarDecl.
14650Optional<std::pair<CharUnits, CharUnits>>
14651static getBaseAlignmentAndOffsetFromPtr(const Expr *E, ASTContext &Ctx) {
E = E->IgnoreParens();
switch (E->getStmtClass()) {
default:
  break;
case Stmt::CStyleCastExprClass:
case Stmt::CXXStaticCastExprClass:
case Stmt::ImplicitCastExprClass: {
  auto *CE = cast<CastExpr>(E);
  const Expr *From = CE->getSubExpr();
  switch (CE->getCastKind()) {
  default:
    break;
  case CK_NoOp:
    return getBaseAlignmentAndOffsetFromPtr(From, Ctx);
  case CK_ArrayToPointerDecay:
    return getBaseAlignmentAndOffsetFromLValue(From, Ctx);
  case CK_UncheckedDerivedToBase:
  case CK_DerivedToBase: {
    auto P = getBaseAlignmentAndOffsetFromPtr(From, Ctx);
    if (!P)
      break;
    return getDerivedToBaseAlignmentAndOffset(
        CE, From->getType()->getPointeeType(), P->first, P->second, Ctx);
  }
  }
  break;
}
case Stmt::CXXThisExprClass: {
  auto *RD = E->getType()->getPointeeType()->getAsCXXRecordDecl();
  CharUnits Alignment = Ctx.getASTRecordLayout(RD).getNonVirtualAlignment();
  return std::make_pair(Alignment, CharUnits::Zero());
}
case Stmt::UnaryOperatorClass: {
  auto *UO = cast<UnaryOperator>(E);
  if (UO->getOpcode() == UO_AddrOf)
    return getBaseAlignmentAndOffsetFromLValue(UO->getSubExpr(), Ctx);
  break;
}
case Stmt::BinaryOperatorClass: {
  auto *BO = cast<BinaryOperator>(E);
  auto Opcode = BO->getOpcode();
  switch (Opcode) {
  default:
    break;
  case BO_Add:
  case BO_Sub: {
    const Expr *LHS = BO->getLHS(), *RHS = BO->getRHS();
    if (Opcode == BO_Add && !RHS->getType()->isIntegralOrEnumerationType())
      std::swap(LHS, RHS);
    return getAlignmentAndOffsetFromBinAddOrSub(LHS, RHS, Opcode == BO_Sub,
                                                Ctx);
  }
  case BO_Comma:
    return getBaseAlignmentAndOffsetFromPtr(BO->getRHS(), Ctx);
  }
  break;
}
}
return llvm::None;
14711}

14713static CharUnits getPresumedAlignmentOfPointer(const Expr *E, Sema &S) {
// See if we can compute the alignment of a VarDecl and an offset from it.
Optional<std::pair<CharUnits, CharUnits>> P =
    getBaseAlignmentAndOffsetFromPtr(E, S.Context);

if (P)
  return P->first.alignmentAtOffset(P->second);

// If that failed, return the type's alignment.
return S.Context.getTypeAlignInChars(E->getType()->getPointeeType());
14723}

14725/// CheckCastAlign - Implements -Wcast-align, which warns when a
14726/// pointer cast increases the alignment requirements.
14727void Sema::CheckCastAlign(Expr *Op, QualType T, SourceRange TRange) {
// This is actually a lot of work to potentially be doing on every
// cast; don't do it if we're ignoring -Wcast_align (as is the default).
if (getDiagnostics().isIgnored(diag::warn_cast_align, TRange.getBegin()))
  return;

// Ignore dependent types.
if (T->isDependentType() || Op->getType()->isDependentType())
  return;

// Require that the destination be a pointer type.
const PointerType *DestPtr = T->getAs<PointerType>();
if (!DestPtr) return;

// If the destination has alignment 1, we're done.
QualType DestPointee = DestPtr->getPointeeType();
if (DestPointee->isIncompleteType()) return;
CharUnits DestAlign = Context.getTypeAlignInChars(DestPointee);
if (DestAlign.isOne()) return;

// Require that the source be a pointer type.
const PointerType *SrcPtr = Op->getType()->getAs<PointerType>();
if (!SrcPtr) return;
QualType SrcPointee = SrcPtr->getPointeeType();

// Explicitly allow casts from cv void*.  We already implicitly
// allowed casts to cv void*, since they have alignment 1.
// Also allow casts involving incomplete types, which implicitly
// includes 'void'.
if (SrcPointee->isIncompleteType()) return;

CharUnits SrcAlign = getPresumedAlignmentOfPointer(Op, *this);

if (SrcAlign >= DestAlign) return;

Diag(TRange.getBegin(), diag::warn_cast_align)
  << Op->getType() << T
  << static_cast<unsigned>(SrcAlign.getQuantity())
  << static_cast<unsigned>(DestAlign.getQuantity())
  << TRange << Op->getSourceRange();
14767}

14769/// Check whether this array fits the idiom of a size-one tail padded
14770/// array member of a struct.
14771///
14772/// We avoid emitting out-of-bounds access warnings for such arrays as they are
14773/// commonly used to emulate flexible arrays in C89 code.
14774static bool IsTailPaddedMemberArray(Sema &S, const llvm::APInt &Size,
                                  const NamedDecl *ND) {
if (Size != 1 || !ND) return false;

const FieldDecl *FD = dyn_cast<FieldDecl>(ND);
if (!FD) return false;

// Don't consider sizes resulting from macro expansions or template argument
// substitution to form C89 tail-padded arrays.

TypeSourceInfo *TInfo = FD->getTypeSourceInfo();
while (TInfo) {
  TypeLoc TL = TInfo->getTypeLoc();
  // Look through typedefs.
  if (TypedefTypeLoc TTL = TL.getAs<TypedefTypeLoc>()) {
    const TypedefNameDecl *TDL = TTL.getTypedefNameDecl();
    TInfo = TDL->getTypeSourceInfo();
    continue;
  }
  if (ConstantArrayTypeLoc CTL = TL.getAs<ConstantArrayTypeLoc>()) {
    const Expr *SizeExpr = dyn_cast<IntegerLiteral>(CTL.getSizeExpr());
    if (!SizeExpr || SizeExpr->getExprLoc().isMacroID())
      return false;
  }
  break;
}

const RecordDecl *RD = dyn_cast<RecordDecl>(FD->getDeclContext());
if (!RD) return false;
if (RD->isUnion()) return false;
if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
  if (!CRD->isStandardLayout()) return false;
}

// See if this is the last field decl in the record.
const Decl *D = FD;
while ((D = D->getNextDeclInContext()))
  if (isa<FieldDecl>(D))
    return false;
return true;
14814}

14816void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
                          const ArraySubscriptExpr *ASE,
                          bool AllowOnePastEnd, bool IndexNegated) {
// Already diagnosed by the constant evaluator.
if (isConstantEvaluated())
  return;

IndexExpr = IndexExpr->IgnoreParenImpCasts();
if (IndexExpr->isValueDependent())
  return;

const Type *EffectiveType =
    BaseExpr->getType()->getPointeeOrArrayElementType();
BaseExpr = BaseExpr->IgnoreParenCasts();
const ConstantArrayType *ArrayTy =
    Context.getAsConstantArrayType(BaseExpr->getType());

const Type *BaseType =
    ArrayTy == nullptr ? nullptr : ArrayTy->getElementType().getTypePtr();
bool IsUnboundedArray = (BaseType == nullptr);
if (EffectiveType->isDependentType() ||
    (!IsUnboundedArray && BaseType->isDependentType()))
  return;

Expr::EvalResult Result;
if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects))
  return;

llvm::APSInt index = Result.Val.getInt();
if (IndexNegated) {
  index.setIsUnsigned(false);
  index = -index;
}

const NamedDecl *ND = nullptr;
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
  ND = DRE->getDecl();
if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
  ND = ME->getMemberDecl();

if (IsUnboundedArray) {
  if (index.isUnsigned() || !index.isNegative()) {
    const auto &ASTC = getASTContext();
    unsigned AddrBits =
        ASTC.getTargetInfo().getPointerWidth(ASTC.getTargetAddressSpace(
            EffectiveType->getCanonicalTypeInternal()));
    if (index.getBitWidth() < AddrBits)
      index = index.zext(AddrBits);
    Optional<CharUnits> ElemCharUnits =
        ASTC.getTypeSizeInCharsIfKnown(EffectiveType);
    // PR50741 - If EffectiveType has unknown size (e.g., if it's a void
    // pointer) bounds-checking isn't meaningful.
    if (!ElemCharUnits)
      return;
    llvm::APInt ElemBytes(index.getBitWidth(), ElemCharUnits->getQuantity());
    // If index has more active bits than address space, we already know
    // we have a bounds violation to warn about.  Otherwise, compute
    // address of (index + 1)th element, and warn about bounds violation
    // only if that address exceeds address space.
    if (index.getActiveBits() <= AddrBits) {
      bool Overflow;
      llvm::APInt Product(index);
      Product += 1;
      Product = Product.umul_ov(ElemBytes, Overflow);
      if (!Overflow && Product.getActiveBits() <= AddrBits)
        return;
    }

    // Need to compute max possible elements in address space, since that
    // is included in diag message.
    llvm::APInt MaxElems = llvm::APInt::getMaxValue(AddrBits);
    MaxElems = MaxElems.zext(std::max(AddrBits + 1, ElemBytes.getBitWidth()));
    MaxElems += 1;
    ElemBytes = ElemBytes.zextOrTrunc(MaxElems.getBitWidth());
    MaxElems = MaxElems.udiv(ElemBytes);

    unsigned DiagID =
        ASE ? diag::warn_array_index_exceeds_max_addressable_bounds
            : diag::warn_ptr_arith_exceeds_max_addressable_bounds;

    // Diag message shows element size in bits and in "bytes" (platform-
    // dependent CharUnits)
    DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
                        PDiag(DiagID)
                            << toString(index, 10, true) << AddrBits
                            << (unsigned)ASTC.toBits(*ElemCharUnits)
                            << toString(ElemBytes, 10, false)
                            << toString(MaxElems, 10, false)
                            << (unsigned)MaxElems.getLimitedValue(~0U)
                            << IndexExpr->getSourceRange());

    if (!ND) {
      // Try harder to find a NamedDecl to point at in the note.
      while (const auto *ASE = dyn_cast<ArraySubscriptExpr>(BaseExpr))
        BaseExpr = ASE->getBase()->IgnoreParenCasts();
      if (const auto *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
        ND = DRE->getDecl();
      if (const auto *ME = dyn_cast<MemberExpr>(BaseExpr))
        ND = ME->getMemberDecl();
    }

    if (ND)
      DiagRuntimeBehavior(ND->getBeginLoc(), BaseExpr,
                          PDiag(diag::note_array_declared_here) << ND);
  }
  return;
}

if (index.isUnsigned() || !index.isNegative()) {
  // It is possible that the type of the base expression after
  // IgnoreParenCasts is incomplete, even though the type of the base
  // expression before IgnoreParenCasts is complete (see PR39746 for an
  // example). In this case we have no information about whether the array
  // access exceeds the array bounds. However we can still diagnose an array
  // access which precedes the array bounds.
  if (BaseType->isIncompleteType())
    return;

  llvm::APInt size = ArrayTy->getSize();
  if (!size.isStrictlyPositive())
    return;

  if (BaseType != EffectiveType) {
    // Make sure we're comparing apples to apples when comparing index to size
    uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType);
    uint64_t array_typesize = Context.getTypeSize(BaseType);
    // Handle ptrarith_typesize being zero, such as when casting to void*
    if (!ptrarith_typesize) ptrarith_typesize = 1;
    if (ptrarith_typesize != array_typesize) {
      // There's a cast to a different size type involved
      uint64_t ratio = array_typesize / ptrarith_typesize;
      // TODO: Be smarter about handling cases where array_typesize is not a
      // multiple of ptrarith_typesize
      if (ptrarith_typesize * ratio == array_typesize)
        size *= llvm::APInt(size.getBitWidth(), ratio);
    }
  }

  if (size.getBitWidth() > index.getBitWidth())
    index = index.zext(size.getBitWidth());
  else if (size.getBitWidth() < index.getBitWidth())
    size = size.zext(index.getBitWidth());

  // For array subscripting the index must be less than size, but for pointer
  // arithmetic also allow the index (offset) to be equal to size since
  // computing the next address after the end of the array is legal and
  // commonly done e.g. in C++ iterators and range-based for loops.
  if (AllowOnePastEnd ? index.ule(size) : index.ult(size))
    return;

  // Also don't warn for arrays of size 1 which are members of some
  // structure. These are often used to approximate flexible arrays in C89
  // code.
  if (IsTailPaddedMemberArray(*this, size, ND))
    return;

  // Suppress the warning if the subscript expression (as identified by the
  // ']' location) and the index expression are both from macro expansions
  // within a system header.
  if (ASE) {
    SourceLocation RBracketLoc = SourceMgr.getSpellingLoc(
        ASE->getRBracketLoc());
    if (SourceMgr.isInSystemHeader(RBracketLoc)) {
      SourceLocation IndexLoc =
          SourceMgr.getSpellingLoc(IndexExpr->getBeginLoc());
      if (SourceMgr.isWrittenInSameFile(RBracketLoc, IndexLoc))
        return;
    }
  }

  unsigned DiagID = ASE ? diag::warn_array_index_exceeds_bounds
                        : diag::warn_ptr_arith_exceeds_bounds;

  DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
                      PDiag(DiagID) << toString(index, 10, true)
                                    << toString(size, 10, true)
                                    << (unsigned)size.getLimitedValue(~0U)
                                    << IndexExpr->getSourceRange());
} else {
  unsigned DiagID = diag::warn_array_index_precedes_bounds;
  if (!ASE) {
    DiagID = diag::warn_ptr_arith_precedes_bounds;
    if (index.isNegative()) index = -index;
  }

  DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
                      PDiag(DiagID) << toString(index, 10, true)
                                    << IndexExpr->getSourceRange());
}

if (!ND) {
  // Try harder to find a NamedDecl to point at in the note.
  while (const auto *ASE = dyn_cast<ArraySubscriptExpr>(BaseExpr))
    BaseExpr = ASE->getBase()->IgnoreParenCasts();
  if (const auto *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
    ND = DRE->getDecl();
  if (const auto *ME = dyn_cast<MemberExpr>(BaseExpr))
    ND = ME->getMemberDecl();
}

if (ND)
  DiagRuntimeBehavior(ND->getBeginLoc(), BaseExpr,
                      PDiag(diag::note_array_declared_here) << ND);
15019}

15021void Sema::CheckArrayAccess(const Expr *expr) {
int AllowOnePastEnd = 0;
while (expr) {
  expr = expr->IgnoreParenImpCasts();
  switch (expr->getStmtClass()) {
    case Stmt::ArraySubscriptExprClass: {
      const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(expr);
      CheckArrayAccess(ASE->getBase(), ASE->getIdx(), ASE,
                       AllowOnePastEnd > 0);
      expr = ASE->getBase();
      break;
    }
    case Stmt::MemberExprClass: {
      expr = cast<MemberExpr>(expr)->getBase();
      break;
    }
    case Stmt::OMPArraySectionExprClass: {
      const OMPArraySectionExpr *ASE = cast<OMPArraySectionExpr>(expr);
      if (ASE->getLowerBound())
        CheckArrayAccess(ASE->getBase(), ASE->getLowerBound(),
                         /*ASE=*/nullptr, AllowOnePastEnd > 0);
      return;
    }
    case Stmt::UnaryOperatorClass: {
      // Only unwrap the * and & unary operators
      const UnaryOperator *UO = cast<UnaryOperator>(expr);
      expr = UO->getSubExpr();
      switch (UO->getOpcode()) {
        case UO_AddrOf:
          AllowOnePastEnd++;
          break;
        case UO_Deref:
          AllowOnePastEnd--;
          break;
        default:
          return;
      }
      break;
    }
    case Stmt::ConditionalOperatorClass: {
      const ConditionalOperator *cond = cast<ConditionalOperator>(expr);
      if (const Expr *lhs = cond->getLHS())
        CheckArrayAccess(lhs);
      if (const Expr *rhs = cond->getRHS())
        CheckArrayAccess(rhs);
      return;
    }
    case Stmt::CXXOperatorCallExprClass: {
      const auto *OCE = cast<CXXOperatorCallExpr>(expr);
      for (const auto *Arg : OCE->arguments())
        CheckArrayAccess(Arg);
      return;
    }
    default:
      return;
  }
}
15078}

15080//===--- CHECK: Objective-C retain cycles ----------------------------------//

15082namespace {

15084struct RetainCycleOwner {
VarDecl *Variable = nullptr;
SourceRange Range;
SourceLocation Loc;
bool Indirect = false;

RetainCycleOwner() = default;

void setLocsFrom(Expr *e) {
  Loc = e->getExprLoc();
  Range = e->getSourceRange();
}
15096};

15098} // namespace

15100/// Consider whether capturing the given variable can possibly lead to
15101/// a retain cycle.
15102static bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) {
// In ARC, it's captured strongly iff the variable has __strong
// lifetime.  In MRR, it's captured strongly if the variable is
// __block and has an appropriate type.
if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
  return false;

owner.Variable = var;
if (ref)
  owner.setLocsFrom(ref);
return true;
15113}

15115static bool findRetainCycleOwner(Sema &S, Expr *e, RetainCycleOwner &owner) {
while (true) {
  e = e->IgnoreParens();
  if (CastExpr *cast = dyn_cast<CastExpr>(e)) {
    switch (cast->getCastKind()) {
    case CK_BitCast:
    case CK_LValueBitCast:
    case CK_LValueToRValue:
    case CK_ARCReclaimReturnedObject:
      e = cast->getSubExpr();
      continue;

    default:
      return false;
    }
  }

  if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) {
    ObjCIvarDecl *ivar = ref->getDecl();
    if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
      return false;

    // Try to find a retain cycle in the base.
    if (!findRetainCycleOwner(S, ref->getBase(), owner))
      return false;

    if (ref->isFreeIvar()) owner.setLocsFrom(ref);
    owner.Indirect = true;
    return true;
  }

  if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
    VarDecl *var = dyn_cast<VarDecl>(ref->getDecl());
    if (!var) return false;
    return considerVariable(var, ref, owner);
  }

  if (MemberExpr *member = dyn_cast<MemberExpr>(e)) {
    if (member->isArrow()) return false;

    // Don't count this as an indirect ownership.
    e = member->getBase();
    continue;
  }

  if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
    // Only pay attention to pseudo-objects on property references.
    ObjCPropertyRefExpr *pre
      = dyn_cast<ObjCPropertyRefExpr>(pseudo->getSyntacticForm()
                                            ->IgnoreParens());
    if (!pre) return false;
    if (pre->isImplicitProperty()) return false;
    ObjCPropertyDecl *property = pre->getExplicitProperty();
    if (!property->isRetaining() &&
        !(property->getPropertyIvarDecl() &&
          property->getPropertyIvarDecl()->getType()
            .getObjCLifetime() == Qualifiers::OCL_Strong))
        return false;

    owner.Indirect = true;
    if (pre->isSuperReceiver()) {
      owner.Variable = S.getCurMethodDecl()->getSelfDecl();
      if (!owner.Variable)
        return false;
      owner.Loc = pre->getLocation();
      owner.Range = pre->getSourceRange();
      return true;
    }
    e = const_cast<Expr*>(cast<OpaqueValueExpr>(pre->getBase())
                            ->getSourceExpr());
    continue;
  }

  // Array ivars?

  return false;
}
15192}

15194namespace {

struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> {
  ASTContext &Context;
  VarDecl *Variable;
  Expr *Capturer = nullptr;
  bool VarWillBeReased = false;

  FindCaptureVisitor(ASTContext &Context, VarDecl *variable)
      : EvaluatedExprVisitor<FindCaptureVisitor>(Context),
        Context(Context), Variable(variable) {}

  void VisitDeclRefExpr(DeclRefExpr *ref) {
    if (ref->getDecl() == Variable && !Capturer)
      Capturer = ref;
  }

  void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) {
    if (Capturer) return;
    Visit(ref->getBase());
    if (Capturer && ref->isFreeIvar())
      Capturer = ref;
  }

  void VisitBlockExpr(BlockExpr *block) {
    // Look inside nested blocks
    if (block->getBlockDecl()->capturesVariable(Variable))
      Visit(block->getBlockDecl()->getBody());
  }

  void VisitOpaqueValueExpr(OpaqueValueExpr *OVE) {
    if (Capturer) return;
    if (OVE->getSourceExpr())
      Visit(OVE->getSourceExpr());
  }

  void VisitBinaryOperator(BinaryOperator *BinOp) {
    if (!Variable || VarWillBeReased || BinOp->getOpcode() != BO_Assign)
      return;
    Expr *LHS = BinOp->getLHS();
    if (const DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(LHS)) {
      if (DRE->getDecl() != Variable)
        return;
      if (Expr *RHS = BinOp->getRHS()) {
        RHS = RHS->IgnoreParenCasts();
        Optional<llvm::APSInt> Value;
        VarWillBeReased =
            (RHS && (Value = RHS->getIntegerConstantExpr(Context)) &&
             *Value == 0);
      }
    }
  }
};

15248} // namespace

15250/// Check whether the given argument is a block which captures a
15251/// variable.
15252static Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) {
assert(owner.Variable && owner.Loc.isValid())((void)0);

e = e->IgnoreParenCasts();

// Look through [^{...} copy] and Block_copy(^{...}).
if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(e)) {
  Selector Cmd = ME->getSelector();
  if (Cmd.isUnarySelector() && Cmd.getNameForSlot(0) == "copy") {
    e = ME->getInstanceReceiver();
    if (!e)
      return nullptr;
    e = e->IgnoreParenCasts();
  }
} else if (CallExpr *CE = dyn_cast<CallExpr>(e)) {
  if (CE->getNumArgs() == 1) {
    FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
    if (Fn) {
      const IdentifierInfo *FnI = Fn->getIdentifier();
      if (FnI && FnI->isStr("_Block_copy")) {
        e = CE->getArg(0)->IgnoreParenCasts();
      }
    }
  }
}

BlockExpr *block = dyn_cast<BlockExpr>(e);
if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable))
  return nullptr;

FindCaptureVisitor visitor(S.Context, owner.Variable);
visitor.Visit(block->getBlockDecl()->getBody());
return visitor.VarWillBeReased ? nullptr : visitor.Capturer;
15285}

15287static void diagnoseRetainCycle(Sema &S, Expr *capturer,
                              RetainCycleOwner &owner) {
assert(capturer)((void)0);
assert(owner.Variable && owner.Loc.isValid())((void)0);

S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle)
  << owner.Variable << capturer->getSourceRange();
S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner)
  << owner.Indirect << owner.Range;
15296}

15298/// Check for a keyword selector that starts with the word 'add' or
15299/// 'set'.
15300static bool isSetterLikeSelector(Selector sel) {
if (sel.isUnarySelector()) return false;

StringRef str = sel.getNameForSlot(0);
while (!str.empty() && str.front() == '_') str = str.substr(1);
if (str.startswith("set"))
  str = str.substr(3);
else if (str.startswith("add")) {
  // Specially allow 'addOperationWithBlock:'.
  if (sel.getNumArgs() == 1 && str.startswith("addOperationWithBlock"))
    return false;
  str = str.substr(3);
}
else
  return false;

if (str.empty()) return true;
return !isLowercase(str.front());
15318}

15320static Optional<int> GetNSMutableArrayArgumentIndex(Sema &S,
                                                  ObjCMessageExpr *Message) {
bool IsMutableArray = S.NSAPIObj->isSubclassOfNSClass(
                                              Message->getReceiverInterface(),
                                              NSAPI::ClassId_NSMutableArray);
if (!IsMutableArray) {
  return None;
}

Selector Sel = Message->getSelector();

Optional<NSAPI::NSArrayMethodKind> MKOpt =
  S.NSAPIObj->getNSArrayMethodKind(Sel);
if (!MKOpt) {
  return None;
}

NSAPI::NSArrayMethodKind MK = *MKOpt;

switch (MK) {
  case NSAPI::NSMutableArr_addObject:
  case NSAPI::NSMutableArr_insertObjectAtIndex:
  case NSAPI::NSMutableArr_setObjectAtIndexedSubscript:
    return 0;
  case NSAPI::NSMutableArr_replaceObjectAtIndex:
    return 1;

  default:
    return None;
}

return None;
15352}

15354static
15355Optional<int> GetNSMutableDictionaryArgumentIndex(Sema &S,
                                                ObjCMessageExpr *Message) {
bool IsMutableDictionary = S.NSAPIObj->isSubclassOfNSClass(
                                          Message->getReceiverInterface(),
                                          NSAPI::ClassId_NSMutableDictionary);
if (!IsMutableDictionary) {
  return None;
}

Selector Sel = Message->getSelector();

Optional<NSAPI::NSDictionaryMethodKind> MKOpt =
  S.NSAPIObj->getNSDictionaryMethodKind(Sel);
if (!MKOpt) {
  return None;
}

NSAPI::NSDictionaryMethodKind MK = *MKOpt;

switch (MK) {
  case NSAPI::NSMutableDict_setObjectForKey:
  case NSAPI::NSMutableDict_setValueForKey:
  case NSAPI::NSMutableDict_setObjectForKeyedSubscript:
    return 0;

  default:
    return None;
}

return None;
15385}

15387static Optional<int> GetNSSetArgumentIndex(Sema &S, ObjCMessageExpr *Message) {
bool IsMutableSet = S.NSAPIObj->isSubclassOfNSClass(
                                              Message->getReceiverInterface(),
                                              NSAPI::ClassId_NSMutableSet);

bool IsMutableOrderedSet = S.NSAPIObj->isSubclassOfNSClass(
                                          Message->getReceiverInterface(),
                                          NSAPI::ClassId_NSMutableOrderedSet);
if (!IsMutableSet && !IsMutableOrderedSet) {
  return None;
}

Selector Sel = Message->getSelector();

Optional<NSAPI::NSSetMethodKind> MKOpt = S.NSAPIObj->getNSSetMethodKind(Sel);
if (!MKOpt) {
  return None;
}

NSAPI::NSSetMethodKind MK = *MKOpt;

switch (MK) {
  case NSAPI::NSMutableSet_addObject:
  case NSAPI::NSOrderedSet_setObjectAtIndex:
  case NSAPI::NSOrderedSet_setObjectAtIndexedSubscript:
  case NSAPI::NSOrderedSet_insertObjectAtIndex:
    return 0;
  case NSAPI::NSOrderedSet_replaceObjectAtIndexWithObject:
    return 1;
}

return None;
15419}

15421void Sema::CheckObjCCircularContainer(ObjCMessageExpr *Message) {
if (!Message->isInstanceMessage()) {
  return;
}

Optional<int> ArgOpt;

if (!(ArgOpt = GetNSMutableArrayArgumentIndex(*this, Message)) &&
    !(ArgOpt = GetNSMutableDictionaryArgumentIndex(*this, Message)) &&
    !(ArgOpt = GetNSSetArgumentIndex(*this, Message))) {
  return;
}

int ArgIndex = *ArgOpt;

Expr *Arg = Message->getArg(ArgIndex)->IgnoreImpCasts();
if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Arg)) {
  Arg = OE->getSourceExpr()->IgnoreImpCasts();
}

if (Message->getReceiverKind() == ObjCMessageExpr::SuperInstance) {
  if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
    if (ArgRE->isObjCSelfExpr()) {
      Diag(Message->getSourceRange().getBegin(),
           diag::warn_objc_circular_container)
        << ArgRE->getDecl() << StringRef("'super'");
    }
  }
} else {
  Expr *Receiver = Message->getInstanceReceiver()->IgnoreImpCasts();

  if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Receiver)) {
    Receiver = OE->getSourceExpr()->IgnoreImpCasts();
  }

  if (DeclRefExpr *ReceiverRE = dyn_cast<DeclRefExpr>(Receiver)) {
    if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
      if (ReceiverRE->getDecl() == ArgRE->getDecl()) {
        ValueDecl *Decl = ReceiverRE->getDecl();
        Diag(Message->getSourceRange().getBegin(),
             diag::warn_objc_circular_container)
          << Decl << Decl;
        if (!ArgRE->isObjCSelfExpr()) {
          Diag(Decl->getLocation(),
               diag::note_objc_circular_container_declared_here)
            << Decl;
        }
      }
    }
  } else if (ObjCIvarRefExpr *IvarRE = dyn_cast<ObjCIvarRefExpr>(Receiver)) {
    if (ObjCIvarRefExpr *IvarArgRE = dyn_cast<ObjCIvarRefExpr>(Arg)) {
      if (IvarRE->getDecl() == IvarArgRE->getDecl()) {
        ObjCIvarDecl *Decl = IvarRE->getDecl();
        Diag(Message->getSourceRange().getBegin(),
             diag::warn_objc_circular_container)
          << Decl << Decl;
        Diag(Decl->getLocation(),
             diag::note_objc_circular_container_declared_here)
          << Decl;
      }
    }
  }
}
15484}

15486/// Check a message send to see if it's likely to cause a retain cycle.
15487void Sema::checkRetainCycles(ObjCMessageExpr *msg) {
// Only check instance methods whose selector looks like a setter.
if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector()))
  return;

// Try to find a variable that the receiver is strongly owned by.
RetainCycleOwner owner;
if (msg->getReceiverKind() == ObjCMessageExpr::Instance) {
  if (!findRetainCycleOwner(*this, msg->getInstanceReceiver(), owner))
    return;
} else {
  assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance)((void)0);
  owner.Variable = getCurMethodDecl()->getSelfDecl();
  owner.Loc = msg->getSuperLoc();
  owner.Range = msg->getSuperLoc();
}

// Check whether the receiver is captured by any of the arguments.
const ObjCMethodDecl *MD = msg->getMethodDecl();
for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i) {
  if (Expr *capturer = findCapturingExpr(*this, msg->getArg(i), owner)) {
    // noescape blocks should not be retained by the method.
    if (MD && MD->parameters()[i]->hasAttr<NoEscapeAttr>())
      continue;
    return diagnoseRetainCycle(*this, capturer, owner);
  }
}
15514}

15516/// Check a property assign to see if it's likely to cause a retain cycle.
15517void Sema::checkRetainCycles(Expr *receiver, Expr *argument) {
RetainCycleOwner owner;
if (!findRetainCycleOwner(*this, receiver, owner))
  return;

if (Expr *capturer = findCapturingExpr(*this, argument, owner))
  diagnoseRetainCycle(*this, capturer, owner);
15524}

15526void Sema::checkRetainCycles(VarDecl *Var, Expr *Init) {
RetainCycleOwner Owner;
if (!considerVariable(Var, /*DeclRefExpr=*/nullptr, Owner))
  return;

// Because we don't have an expression for the variable, we have to set the
// location explicitly here.
Owner.Loc = Var->getLocation();
Owner.Range = Var->getSourceRange();

if (Expr *Capturer = findCapturingExpr(*this, Init, Owner))
  diagnoseRetainCycle(*this, Capturer, Owner);
15538}

15540static bool checkUnsafeAssignLiteral(Sema &S, SourceLocation Loc,
                                   Expr *RHS, bool isProperty) {
// Check if RHS is an Objective-C object literal, which also can get
// immediately zapped in a weak reference.  Note that we explicitly
// allow ObjCStringLiterals, since those are designed to never really die.
RHS = RHS->IgnoreParenImpCasts();

// This enum needs to match with the 'select' in
// warn_objc_arc_literal_assign (off-by-1).
Sema::ObjCLiteralKind Kind = S.CheckLiteralKind(RHS);
if (Kind == Sema::LK_String || Kind == Sema::LK_None)
  return false;

S.Diag(Loc, diag::warn_arc_literal_assign)
  << (unsigned) Kind
  << (isProperty ? 0 : 1)
  << RHS->getSourceRange();

return true;
15559}

15561static bool checkUnsafeAssignObject(Sema &S, SourceLocation Loc,
                                  Qualifiers::ObjCLifetime LT,
                                  Expr *RHS, bool isProperty) {
// Strip off any implicit cast added to get to the one ARC-specific.
while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
  if (cast->getCastKind() == CK_ARCConsumeObject) {
    S.Diag(Loc, diag::warn_arc_retained_assign)
      << (LT == Qualifiers::OCL_ExplicitNone)
      << (isProperty ? 0 : 1)
      << RHS->getSourceRange();
    return true;
  }
  RHS = cast->getSubExpr();
}

if (LT == Qualifiers::OCL_Weak &&
    checkUnsafeAssignLiteral(S, Loc, RHS, isProperty))
  return true;

return false;
15581}

15583bool Sema::checkUnsafeAssigns(SourceLocation Loc,
                            QualType LHS, Expr *RHS) {
Qualifiers::ObjCLifetime LT = LHS.getObjCLifetime();

if (LT != Qualifiers::OCL_Weak && LT != Qualifiers::OCL_ExplicitNone)
  return false;

if (checkUnsafeAssignObject(*this, Loc, LT, RHS, false))
  return true;

return false;
15594}

15596void Sema::checkUnsafeExprAssigns(SourceLocation Loc,
                            Expr *LHS, Expr *RHS) {
QualType LHSType;
// PropertyRef on LHS type need be directly obtained from
// its declaration as it has a PseudoType.
ObjCPropertyRefExpr *PRE
  = dyn_cast<ObjCPropertyRefExpr>(LHS->IgnoreParens());
if (PRE && !PRE->isImplicitProperty()) {
  const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
  if (PD)
    LHSType = PD->getType();
}

if (LHSType.isNull())
  LHSType = LHS->getType();

Qualifiers::ObjCLifetime LT = LHSType.getObjCLifetime();

if (LT == Qualifiers::OCL_Weak) {
  if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
    getCurFunction()->markSafeWeakUse(LHS);
}

if (checkUnsafeAssigns(Loc, LHSType, RHS))
  return;

// FIXME. Check for other life times.
if (LT != Qualifiers::OCL_None)
  return;

if (PRE) {
  if (PRE->isImplicitProperty())
    return;
  const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
  if (!PD)
    return;

  unsigned Attributes = PD->getPropertyAttributes();
  if (Attributes & ObjCPropertyAttribute::kind_assign) {
    // when 'assign' attribute was not explicitly specified
    // by user, ignore it and rely on property type itself
    // for lifetime info.
    unsigned AsWrittenAttr = PD->getPropertyAttributesAsWritten();
    if (!(AsWrittenAttr & ObjCPropertyAttribute::kind_assign) &&
        LHSType->isObjCRetainableType())
      return;

    while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
      if (cast->getCastKind() == CK_ARCConsumeObject) {
        Diag(Loc, diag::warn_arc_retained_property_assign)
        << RHS->getSourceRange();
        return;
      }
      RHS = cast->getSubExpr();
    }
  } else if (Attributes & ObjCPropertyAttribute::kind_weak) {
    if (checkUnsafeAssignObject(*this, Loc, Qualifiers::OCL_Weak, RHS, true))
      return;
  }
}
15656}

15658//===--- CHECK: Empty statement body (-Wempty-body) ---------------------===//

15660static bool ShouldDiagnoseEmptyStmtBody(const SourceManager &SourceMgr,
                                      SourceLocation StmtLoc,
                                      const NullStmt *Body) {
// Do not warn if the body is a macro that expands to nothing, e.g:
//
// #define CALL(x)
// if (condition)
//   CALL(0);
if (Body->hasLeadingEmptyMacro())
  return false;

// Get line numbers of statement and body.
bool StmtLineInvalid;
unsigned StmtLine = SourceMgr.getPresumedLineNumber(StmtLoc,
                                                    &StmtLineInvalid);
if (StmtLineInvalid)
  return false;

bool BodyLineInvalid;
unsigned BodyLine = SourceMgr.getSpellingLineNumber(Body->getSemiLoc(),
                                                    &BodyLineInvalid);
if (BodyLineInvalid)
  return false;

// Warn if null statement and body are on the same line.
if (StmtLine != BodyLine)
  return false;

return true;
15689}

15691void Sema::DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
                               const Stmt *Body,
                               unsigned DiagID) {
// Since this is a syntactic check, don't emit diagnostic for template
// instantiations, this just adds noise.
if (CurrentInstantiationScope)
  return;

// The body should be a null statement.
const NullStmt *NBody = dyn_cast<NullStmt>(Body);
if (!NBody)
  return;

// Do the usual checks.
if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
  return;

Diag(NBody->getSemiLoc(), DiagID);
Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
15710}

15712void Sema::DiagnoseEmptyLoopBody(const Stmt *S,
                               const Stmt *PossibleBody) {
assert(!CurrentInstantiationScope)((void)0); // Ensured by caller

SourceLocation StmtLoc;
const Stmt *Body;
unsigned DiagID;
if (const ForStmt *FS = dyn_cast<ForStmt>(S)) {
  StmtLoc = FS->getRParenLoc();
  Body = FS->getBody();
  DiagID = diag::warn_empty_for_body;
} else if (const WhileStmt *WS = dyn_cast<WhileStmt>(S)) {
  StmtLoc = WS->getCond()->getSourceRange().getEnd();
  Body = WS->getBody();
  DiagID = diag::warn_empty_while_body;
} else
  return; // Neither `for' nor `while'.

// The body should be a null statement.
const NullStmt *NBody = dyn_cast<NullStmt>(Body);
if (!NBody)
  return;

// Skip expensive checks if diagnostic is disabled.
if (Diags.isIgnored(DiagID, NBody->getSemiLoc()))
  return;

// Do the usual checks.
if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
  return;

// `for(...);' and `while(...);' are popular idioms, so in order to keep
// noise level low, emit diagnostics only if for/while is followed by a
// CompoundStmt, e.g.:
//    for (int i = 0; i < n; i++);
//    {
//      a(i);
//    }
// or if for/while is followed by a statement with more indentation
// than for/while itself:
//    for (int i = 0; i < n; i++);
//      a(i);
bool ProbableTypo = isa<CompoundStmt>(PossibleBody);
if (!ProbableTypo) {
  bool BodyColInvalid;
  unsigned BodyCol = SourceMgr.getPresumedColumnNumber(
      PossibleBody->getBeginLoc(), &BodyColInvalid);
  if (BodyColInvalid)
    return;

  bool StmtColInvalid;
  unsigned StmtCol =
      SourceMgr.getPresumedColumnNumber(S->getBeginLoc(), &StmtColInvalid);
  if (StmtColInvalid)
    return;

  if (BodyCol > StmtCol)
    ProbableTypo = true;
}

if (ProbableTypo) {
  Diag(NBody->getSemiLoc(), DiagID);
  Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
}
15776}

15778//===--- CHECK: Warn on self move with std::move. -------------------------===//

15780/// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
15781void Sema::DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
                           SourceLocation OpLoc) {
if (Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess, OpLoc))
  return;

if (inTemplateInstantiation())
  return;

// Strip parens and casts away.
LHSExpr = LHSExpr->IgnoreParenImpCasts();
RHSExpr = RHSExpr->IgnoreParenImpCasts();

// Check for a call expression
const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
if (!CE || CE->getNumArgs() != 1)
  return;

// Check for a call to std::move
if (!CE->isCallToStdMove())
  return;

// Get argument from std::move
RHSExpr = CE->getArg(0);

const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);

// Two DeclRefExpr's, check that the decls are the same.
if (LHSDeclRef && RHSDeclRef) {
  if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
    return;
  if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
      RHSDeclRef->getDecl()->getCanonicalDecl())
    return;

  Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
                                      << LHSExpr->getSourceRange()
                                      << RHSExpr->getSourceRange();
  return;
}

// Member variables require a different approach to check for self moves.
// MemberExpr's are the same if every nested MemberExpr refers to the same
// Decl and that the base Expr's are DeclRefExpr's with the same Decl or
// the base Expr's are CXXThisExpr's.
const Expr *LHSBase = LHSExpr;
const Expr *RHSBase = RHSExpr;
const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
if (!LHSME || !RHSME)
  return;

while (LHSME && RHSME) {
  if (LHSME->getMemberDecl()->getCanonicalDecl() !=
      RHSME->getMemberDecl()->getCanonicalDecl())
    return;

  LHSBase = LHSME->getBase();
  RHSBase = RHSME->getBase();
  LHSME = dyn_cast<MemberExpr>(LHSBase);
  RHSME = dyn_cast<MemberExpr>(RHSBase);
}

LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
if (LHSDeclRef && RHSDeclRef) {
  if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
    return;
  if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
      RHSDeclRef->getDecl()->getCanonicalDecl())
    return;

  Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
                                      << LHSExpr->getSourceRange()
                                      << RHSExpr->getSourceRange();
  return;
}

if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
  Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
                                      << LHSExpr->getSourceRange()
                                      << RHSExpr->getSourceRange();
15863}

15865//===--- Layout compatibility ----------------------------------------------//

15867static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2);

15869/// Check if two enumeration types are layout-compatible.
15870static bool isLayoutCompatible(ASTContext &C, EnumDecl *ED1, EnumDecl *ED2) {
// C++11 [dcl.enum] p8:
// Two enumeration types are layout-compatible if they have the same
// underlying type.
return ED1->isComplete() && ED2->isComplete() &&
       C.hasSameType(ED1->getIntegerType(), ED2->getIntegerType());
15876}

15878/// Check if two fields are layout-compatible.
15879static bool isLayoutCompatible(ASTContext &C, FieldDecl *Field1,
                             FieldDecl *Field2) {
if (!isLayoutCompatible(C, Field1->getType(), Field2->getType()))
  return false;

if (Field1->isBitField() != Field2->isBitField())
  return false;

if (Field1->isBitField()) {
  // Make sure that the bit-fields are the same length.
  unsigned Bits1 = Field1->getBitWidthValue(C);
  unsigned Bits2 = Field2->getBitWidthValue(C);

  if (Bits1 != Bits2)
    return false;
}

return true;
15897}

15899/// Check if two standard-layout structs are layout-compatible.
15900/// (C++11 [class.mem] p17)
15901static bool isLayoutCompatibleStruct(ASTContext &C, RecordDecl *RD1,
                                   RecordDecl *RD2) {
// If both records are C++ classes, check that base classes match.
if (const CXXRecordDecl *D1CXX = dyn_cast<CXXRecordDecl>(RD1)) {
  // If one of records is a CXXRecordDecl we are in C++ mode,
  // thus the other one is a CXXRecordDecl, too.
  const CXXRecordDecl *D2CXX = cast<CXXRecordDecl>(RD2);
  // Check number of base classes.
  if (D1CXX->getNumBases() != D2CXX->getNumBases())
    return false;

  // Check the base classes.
  for (CXXRecordDecl::base_class_const_iterator
             Base1 = D1CXX->bases_begin(),
         BaseEnd1 = D1CXX->bases_end(),
            Base2 = D2CXX->bases_begin();
       Base1 != BaseEnd1;
       ++Base1, ++Base2) {
    if (!isLayoutCompatible(C, Base1->getType(), Base2->getType()))
      return false;
  }
} else if (const CXXRecordDecl *D2CXX = dyn_cast<CXXRecordDecl>(RD2)) {
  // If only RD2 is a C++ class, it should have zero base classes.
  if (D2CXX->getNumBases() > 0)
    return false;
}

// Check the fields.
RecordDecl::field_iterator Field2 = RD2->field_begin(),
                           Field2End = RD2->field_end(),
                           Field1 = RD1->field_begin(),
                           Field1End = RD1->field_end();
for ( ; Field1 != Field1End && Field2 != Field2End; ++Field1, ++Field2) {
  if (!isLayoutCompatible(C, *Field1, *Field2))
    return false;
}
if (Field1 != Field1End || Field2 != Field2End)
  return false;

return true;
15941}

15943/// Check if two standard-layout unions are layout-compatible.
15944/// (C++11 [class.mem] p18)
15945static bool isLayoutCompatibleUnion(ASTContext &C, RecordDecl *RD1,
                                  RecordDecl *RD2) {
llvm::SmallPtrSet<FieldDecl *, 8> UnmatchedFields;
for (auto *Field2 : RD2->fields())
  UnmatchedFields.insert(Field2);

for (auto *Field1 : RD1->fields()) {
  llvm::SmallPtrSet<FieldDecl *, 8>::iterator
      I = UnmatchedFields.begin(),
      E = UnmatchedFields.end();

  for ( ; I != E; ++I) {
    if (isLayoutCompatible(C, Field1, *I)) {
      bool Result = UnmatchedFields.erase(*I);
      (void) Result;
      assert(Result)((void)0);
      break;
    }
  }
  if (I == E)
    return false;
}

return UnmatchedFields.empty();
15969}

15971static bool isLayoutCompatible(ASTContext &C, RecordDecl *RD1,
                             RecordDecl *RD2) {
if (RD1->isUnion() != RD2->isUnion())
  return false;

if (RD1->isUnion())
  return isLayoutCompatibleUnion(C, RD1, RD2);
else
  return isLayoutCompatibleStruct(C, RD1, RD2);
15980}

15982/// Check if two types are layout-compatible in C++11 sense.
15983static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2) {
if (T1.isNull() || T2.isNull())
  return false;

// C++11 [basic.types] p11:
// If two types T1 and T2 are the same type, then T1 and T2 are
// layout-compatible types.
if (C.hasSameType(T1, T2))
  return true;

T1 = T1.getCanonicalType().getUnqualifiedType();
T2 = T2.getCanonicalType().getUnqualifiedType();

const Type::TypeClass TC1 = T1->getTypeClass();
const Type::TypeClass TC2 = T2->getTypeClass();

if (TC1 != TC2)
  return false;

if (TC1 == Type::Enum) {
  return isLayoutCompatible(C,
                            cast<EnumType>(T1)->getDecl(),
                            cast<EnumType>(T2)->getDecl());
} else if (TC1 == Type::Record) {
  if (!T1->isStandardLayoutType() || !T2->isStandardLayoutType())
    return false;

  return isLayoutCompatible(C,
                            cast<RecordType>(T1)->getDecl(),
                            cast<RecordType>(T2)->getDecl());
}

return false;
16016}

16018//===--- CHECK: pointer_with_type_tag attribute: datatypes should match ----//

16020/// Given a type tag expression find the type tag itself.
16021///
16022/// \param TypeExpr Type tag expression, as it appears in user's code.
16023///
16024/// \param VD Declaration of an identifier that appears in a type tag.
16025///
16026/// \param MagicValue Type tag magic value.
16027///
16028/// \param isConstantEvaluated wether the evalaution should be performed in

16030/// constant context.
16031static bool FindTypeTagExpr(const Expr *TypeExpr, const ASTContext &Ctx,
                          const ValueDecl **VD, uint64_t *MagicValue,
                          bool isConstantEvaluated) {
while(true) {
  if (!TypeExpr)
    return false;

  TypeExpr = TypeExpr->IgnoreParenImpCasts()->IgnoreParenCasts();

  switch (TypeExpr->getStmtClass()) {
  case Stmt::UnaryOperatorClass: {
    const UnaryOperator *UO = cast<UnaryOperator>(TypeExpr);
    if (UO->getOpcode() == UO_AddrOf || UO->getOpcode() == UO_Deref) {
      TypeExpr = UO->getSubExpr();
      continue;
    }
    return false;
  }

  case Stmt::DeclRefExprClass: {
    const DeclRefExpr *DRE = cast<DeclRefExpr>(TypeExpr);
    *VD = DRE->getDecl();
    return true;
  }

  case Stmt::IntegerLiteralClass: {
    const IntegerLiteral *IL = cast<IntegerLiteral>(TypeExpr);
    llvm::APInt MagicValueAPInt = IL->getValue();
    if (MagicValueAPInt.getActiveBits() <= 64) {
      *MagicValue = MagicValueAPInt.getZExtValue();
      return true;
    } else
      return false;
  }

  case Stmt::BinaryConditionalOperatorClass:
  case Stmt::ConditionalOperatorClass: {
    const AbstractConditionalOperator *ACO =
        cast<AbstractConditionalOperator>(TypeExpr);
    bool Result;
    if (ACO->getCond()->EvaluateAsBooleanCondition(Result, Ctx,
                                                   isConstantEvaluated)) {
      if (Result)
        TypeExpr = ACO->getTrueExpr();
      else
        TypeExpr = ACO->getFalseExpr();
      continue;
    }
    return false;
  }

  case Stmt::BinaryOperatorClass: {
    const BinaryOperator *BO = cast<BinaryOperator>(TypeExpr);
    if (BO->getOpcode() == BO_Comma) {
      TypeExpr = BO->getRHS();
      continue;
    }
    return false;
  }

  default:
    return false;
  }
}
16095}

16097/// Retrieve the C type corresponding to type tag TypeExpr.
16098///
16099/// \param TypeExpr Expression that specifies a type tag.
16100///
16101/// \param MagicValues Registered magic values.
16102///
16103/// \param FoundWrongKind Set to true if a type tag was found, but of a wrong
16104///        kind.
16105///
16106/// \param TypeInfo Information about the corresponding C type.
16107///
16108/// \param isConstantEvaluated wether the evalaution should be performed in
16109/// constant context.
16110///
16111/// \returns true if the corresponding C type was found.
16112static bool GetMatchingCType(
  const IdentifierInfo *ArgumentKind, const Expr *TypeExpr,
  const ASTContext &Ctx,
  const llvm::DenseMap<Sema::TypeTagMagicValue, Sema::TypeTagData>
      *MagicValues,
  bool &FoundWrongKind, Sema::TypeTagData &TypeInfo,
  bool isConstantEvaluated) {
FoundWrongKind = false;

// Variable declaration that has type_tag_for_datatype attribute.
const ValueDecl *VD = nullptr;

uint64_t MagicValue;

if (!FindTypeTagExpr(TypeExpr, Ctx, &VD, &MagicValue, isConstantEvaluated))
  return false;

if (VD) {
  if (TypeTagForDatatypeAttr *I = VD->getAttr<TypeTagForDatatypeAttr>()) {
    if (I->getArgumentKind() != ArgumentKind) {
      FoundWrongKind = true;
      return false;
    }
    TypeInfo.Type = I->getMatchingCType();
    TypeInfo.LayoutCompatible = I->getLayoutCompatible();
    TypeInfo.MustBeNull = I->getMustBeNull();
    return true;
  }
  return false;
}

if (!MagicValues)
  return false;

llvm::DenseMap<Sema::TypeTagMagicValue,
               Sema::TypeTagData>::const_iterator I =
    MagicValues->find(std::make_pair(ArgumentKind, MagicValue));
if (I == MagicValues->end())
  return false;

TypeInfo = I->second;
return true;
16154}

16156void Sema::RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
                                    uint64_t MagicValue, QualType Type,
                                    bool LayoutCompatible,
                                    bool MustBeNull) {
if (!TypeTagForDatatypeMagicValues)
  TypeTagForDatatypeMagicValues.reset(
      new llvm::DenseMap<TypeTagMagicValue, TypeTagData>);

TypeTagMagicValue Magic(ArgumentKind, MagicValue);
(*TypeTagForDatatypeMagicValues)[Magic] =
    TypeTagData(Type, LayoutCompatible, MustBeNull);
16167}

16169static bool IsSameCharType(QualType T1, QualType T2) {
const BuiltinType *BT1 = T1->getAs<BuiltinType>();
if (!BT1)
  return false;

const BuiltinType *BT2 = T2->getAs<BuiltinType>();
if (!BT2)
  return false;

BuiltinType::Kind T1Kind = BT1->getKind();
BuiltinType::Kind T2Kind = BT2->getKind();

return (T1Kind == BuiltinType::SChar  && T2Kind == BuiltinType::Char_S) ||
       (T1Kind == BuiltinType::UChar  && T2Kind == BuiltinType::Char_U) ||
       (T1Kind == BuiltinType::Char_U && T2Kind == BuiltinType::UChar) ||
       (T1Kind == BuiltinType::Char_S && T2Kind == BuiltinType::SChar);
16185}

16187void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
                                  const ArrayRef<const Expr *> ExprArgs,
                                  SourceLocation CallSiteLoc) {
const IdentifierInfo *ArgumentKind = Attr->getArgumentKind();
bool IsPointerAttr = Attr->getIsPointer();

// Retrieve the argument representing the 'type_tag'.
unsigned TypeTagIdxAST = Attr->getTypeTagIdx().getASTIndex();
if (TypeTagIdxAST >= ExprArgs.size()) {
  Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
      << 0 << Attr->getTypeTagIdx().getSourceIndex();
  return;
}
const Expr *TypeTagExpr = ExprArgs[TypeTagIdxAST];
bool FoundWrongKind;
TypeTagData TypeInfo;
if (!GetMatchingCType(ArgumentKind, TypeTagExpr, Context,
                      TypeTagForDatatypeMagicValues.get(), FoundWrongKind,
                      TypeInfo, isConstantEvaluated())) {
  if (FoundWrongKind)
    Diag(TypeTagExpr->getExprLoc(),
         diag::warn_type_tag_for_datatype_wrong_kind)
      << TypeTagExpr->getSourceRange();
  return;
}

// Retrieve the argument representing the 'arg_idx'.
unsigned ArgumentIdxAST = Attr->getArgumentIdx().getASTIndex();
if (ArgumentIdxAST >= ExprArgs.size()) {
  Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
      << 1 << Attr->getArgumentIdx().getSourceIndex();
  return;
}
const Expr *ArgumentExpr = ExprArgs[ArgumentIdxAST];
if (IsPointerAttr) {
  // Skip implicit cast of pointer to `void *' (as a function argument).
  if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgumentExpr))
    if (ICE->getType()->isVoidPointerType() &&
        ICE->getCastKind() == CK_BitCast)
      ArgumentExpr = ICE->getSubExpr();
}
QualType ArgumentType = ArgumentExpr->getType();

// Passing a `void*' pointer shouldn't trigger a warning.
if (IsPointerAttr && ArgumentType->isVoidPointerType())
  return;

if (TypeInfo.MustBeNull) {
  // Type tag with matching void type requires a null pointer.
  if (!ArgumentExpr->isNullPointerConstant(Context,
                                           Expr::NPC_ValueDependentIsNotNull)) {
    Diag(ArgumentExpr->getExprLoc(),
         diag::warn_type_safety_null_pointer_required)
        << ArgumentKind->getName()
        << ArgumentExpr->getSourceRange()
        << TypeTagExpr->getSourceRange();
  }
  return;
}

QualType RequiredType = TypeInfo.Type;
if (IsPointerAttr)
  RequiredType = Context.getPointerType(RequiredType);

bool mismatch = false;
if (!TypeInfo.LayoutCompatible) {
  mismatch = !Context.hasSameType(ArgumentType, RequiredType);

  // C++11 [basic.fundamental] p1:
  // Plain char, signed char, and unsigned char are three distinct types.
  //
  // But we treat plain `char' as equivalent to `signed char' or `unsigned
  // char' depending on the current char signedness mode.
  if (mismatch)
    if ((IsPointerAttr && IsSameCharType(ArgumentType->getPointeeType(),
                                         RequiredType->getPointeeType())) ||
        (!IsPointerAttr && IsSameCharType(ArgumentType, RequiredType)))
      mismatch = false;
} else
  if (IsPointerAttr)
    mismatch = !isLayoutCompatible(Context,
                                   ArgumentType->getPointeeType(),
                                   RequiredType->getPointeeType());
  else
    mismatch = !isLayoutCompatible(Context, ArgumentType, RequiredType);

if (mismatch)
  Diag(ArgumentExpr->getExprLoc(), diag::warn_type_safety_type_mismatch)
      << ArgumentType << ArgumentKind
      << TypeInfo.LayoutCompatible << RequiredType
      << ArgumentExpr->getSourceRange()
      << TypeTagExpr->getSourceRange();
16279}

16281void Sema::AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
                                       CharUnits Alignment) {
MisalignedMembers.emplace_back(E, RD, MD, Alignment);
16284}

16286void Sema::DiagnoseMisalignedMembers() {
for (MisalignedMember &m : MisalignedMembers) {
  const NamedDecl *ND = m.RD;
  if (ND->getName().empty()) {
    if (const TypedefNameDecl *TD = m.RD->getTypedefNameForAnonDecl())
      ND = TD;
  }
  Diag(m.E->getBeginLoc(), diag::warn_taking_address_of_packed_member)
      << m.MD << ND << m.E->getSourceRange();
}
MisalignedMembers.clear();
16297}

16299void Sema::DiscardMisalignedMemberAddress(const Type *T, Expr *E) {
E = E->IgnoreParens();
if (!T->isPointerType() && !T->isIntegerType())
  return;
if (isa<UnaryOperator>(E) &&
    cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf) {
  auto *Op = cast<UnaryOperator>(E)->getSubExpr()->IgnoreParens();
  if (isa<MemberExpr>(Op)) {
    auto MA = llvm::find(MisalignedMembers, MisalignedMember(Op));
    if (MA != MisalignedMembers.end() &&
        (T->isIntegerType() ||
         (T->isPointerType() && (T->getPointeeType()->isIncompleteType() ||
                                 Context.getTypeAlignInChars(
                                     T->getPointeeType()) <= MA->Alignment))))
      MisalignedMembers.erase(MA);
  }
}
16316}

16318void Sema::RefersToMemberWithReducedAlignment(
  Expr *E,
  llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
      Action) {
const auto *ME = dyn_cast<MemberExpr>(E);
if (!ME)
  return;

// No need to check expressions with an __unaligned-qualified type.
if (E->getType().getQualifiers().hasUnaligned())
  return;

// For a chain of MemberExpr like "a.b.c.d" this list
// will keep FieldDecl's like [d, c, b].
SmallVector<FieldDecl *, 4> ReverseMemberChain;
const MemberExpr *TopME = nullptr;
bool AnyIsPacked = false;
do {
  QualType BaseType = ME->getBase()->getType();
  if (BaseType->isDependentType())
    return;
  if (ME->isArrow())
    BaseType = BaseType->getPointeeType();
  RecordDecl *RD = BaseType->castAs<RecordType>()->getDecl();
  if (RD->isInvalidDecl())
    return;

  ValueDecl *MD = ME->getMemberDecl();
  auto *FD = dyn_cast<FieldDecl>(MD);
  // We do not care about non-data members.
  if (!FD || FD->isInvalidDecl())
    return;

  AnyIsPacked =
      AnyIsPacked || (RD->hasAttr<PackedAttr>() || MD->hasAttr<PackedAttr>());
  ReverseMemberChain.push_back(FD);

  TopME = ME;
  ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParens());
} while (ME);
assert(TopME && "We did not compute a topmost MemberExpr!")((void)0);

// Not the scope of this diagnostic.
if (!AnyIsPacked)
  return;

const Expr *TopBase = TopME->getBase()->IgnoreParenImpCasts();
const auto *DRE = dyn_cast<DeclRefExpr>(TopBase);
// TODO: The innermost base of the member expression may be too complicated.
// For now, just disregard these cases. This is left for future
// improvement.
if (!DRE && !isa<CXXThisExpr>(TopBase))
    return;

// Alignment expected by the whole expression.
CharUnits ExpectedAlignment = Context.getTypeAlignInChars(E->getType());

// No need to do anything else with this case.
if (ExpectedAlignment.isOne())
  return;

// Synthesize offset of the whole access.
CharUnits Offset;
for (auto I = ReverseMemberChain.rbegin(); I != ReverseMemberChain.rend();
     I++) {
  Offset += Context.toCharUnitsFromBits(Context.getFieldOffset(*I));
}

// Compute the CompleteObjectAlignment as the alignment of the whole chain.
CharUnits CompleteObjectAlignment = Context.getTypeAlignInChars(
    ReverseMemberChain.back()->getParent()->getTypeForDecl());

// The base expression of the innermost MemberExpr may give
// stronger guarantees than the class containing the member.
if (DRE && !TopME->isArrow()) {
  const ValueDecl *VD = DRE->getDecl();
  if (!VD->getType()->isReferenceType())
    CompleteObjectAlignment =
        std::max(CompleteObjectAlignment, Context.getDeclAlign(VD));
}

// Check if the synthesized offset fulfills the alignment.
if (Offset % ExpectedAlignment != 0 ||
    // It may fulfill the offset it but the effective alignment may still be
    // lower than the expected expression alignment.
    CompleteObjectAlignment < ExpectedAlignment) {
  // If this happens, we want to determine a sensible culprit of this.
  // Intuitively, watching the chain of member expressions from right to
  // left, we start with the required alignment (as required by the field
  // type) but some packed attribute in that chain has reduced the alignment.
  // It may happen that another packed structure increases it again. But if
  // we are here such increase has not been enough. So pointing the first
  // FieldDecl that either is packed or else its RecordDecl is,
  // seems reasonable.
  FieldDecl *FD = nullptr;
  CharUnits Alignment;
  for (FieldDecl *FDI : ReverseMemberChain) {
    if (FDI->hasAttr<PackedAttr>() ||
        FDI->getParent()->hasAttr<PackedAttr>()) {
      FD = FDI;
      Alignment = std::min(
          Context.getTypeAlignInChars(FD->getType()),
          Context.getTypeAlignInChars(FD->getParent()->getTypeForDecl()));
      break;
    }
  }
  assert(FD && "We did not find a packed FieldDecl!")((void)0);
  Action(E, FD->getParent(), FD, Alignment);
}
16427}

16429void Sema::CheckAddressOfPackedMember(Expr *rhs) {
using namespace std::placeholders;

RefersToMemberWithReducedAlignment(
    rhs, std::bind(&Sema::AddPotentialMisalignedMembers, std::ref(*this), _1,
                   _2, _3, _4));
16435}

16437ExprResult Sema::SemaBuiltinMatrixTranspose(CallExpr *TheCall,
                                          ExprResult CallResult) {
if (checkArgCount(*this, TheCall, 1))
  return ExprError();

ExprResult MatrixArg = DefaultLvalueConversion(TheCall->getArg(0));
if (MatrixArg.isInvalid())
  return MatrixArg;
Expr *Matrix = MatrixArg.get();

auto *MType = Matrix->getType()->getAs<ConstantMatrixType>();
if (!MType) {
  Diag(Matrix->getBeginLoc(), diag::err_builtin_matrix_arg);
  return ExprError();
}

// Create returned matrix type by swapping rows and columns of the argument
// matrix type.
QualType ResultType = Context.getConstantMatrixType(
    MType->getElementType(), MType->getNumColumns(), MType->getNumRows());

// Change the return type to the type of the returned matrix.
TheCall->setType(ResultType);

// Update call argument to use the possibly converted matrix argument.
TheCall->setArg(0, Matrix);
return CallResult;
16464}

16466// Get and verify the matrix dimensions.
16467static llvm::Optional<unsigned>
16468getAndVerifyMatrixDimension(Expr *Expr, StringRef Name, Sema &S) {
SourceLocation ErrorPos;
Optional<llvm::APSInt> Value =
    Expr->getIntegerConstantExpr(S.Context, &ErrorPos);
if (!Value) {
  S.Diag(Expr->getBeginLoc(), diag::err_builtin_matrix_scalar_unsigned_arg)
      << Name;
  return {};
}
uint64_t Dim = Value->getZExtValue();
if (!ConstantMatrixType::isDimensionValid(Dim)) {
  S.Diag(Expr->getBeginLoc(), diag::err_builtin_matrix_invalid_dimension)
      << Name << ConstantMatrixType::getMaxElementsPerDimension();
  return {};
}
return Dim;
16484}

16486ExprResult Sema::SemaBuiltinMatrixColumnMajorLoad(CallExpr *TheCall,
                                                ExprResult CallResult) {
if (!getLangOpts().MatrixTypes) {
  Diag(TheCall->getBeginLoc(), diag::err_builtin_matrix_disabled);
  return ExprError();
}

if (checkArgCount(*this, TheCall, 4))
  return ExprError();

unsigned PtrArgIdx = 0;
Expr *PtrExpr = TheCall->getArg(PtrArgIdx);
Expr *RowsExpr = TheCall->getArg(1);
Expr *ColumnsExpr = TheCall->getArg(2);
Expr *StrideExpr = TheCall->getArg(3);

bool ArgError = false;

// Check pointer argument.
{
  ExprResult PtrConv = DefaultFunctionArrayLvalueConversion(PtrExpr);
  if (PtrConv.isInvalid())
    return PtrConv;
  PtrExpr = PtrConv.get();
  TheCall->setArg(0, PtrExpr);
  if (PtrExpr->isTypeDependent()) {
    TheCall->setType(Context.DependentTy);
    return TheCall;
  }
}

auto *PtrTy = PtrExpr->getType()->getAs<PointerType>();
QualType ElementTy;
if (!PtrTy) {
  Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
      << PtrArgIdx + 1;
  ArgError = true;
} else {
  ElementTy = PtrTy->getPointeeType().getUnqualifiedType();

  if (!ConstantMatrixType::isValidElementType(ElementTy)) {
    Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
        << PtrArgIdx + 1;
    ArgError = true;
  }
}

// Apply default Lvalue conversions and convert the expression to size_t.
auto ApplyArgumentConversions = [this](Expr *E) {
  ExprResult Conv = DefaultLvalueConversion(E);
  if (Conv.isInvalid())
    return Conv;

  return tryConvertExprToType(Conv.get(), Context.getSizeType());
};

// Apply conversion to row and column expressions.
ExprResult RowsConv = ApplyArgumentConversions(RowsExpr);
if (!RowsConv.isInvalid()) {
  RowsExpr = RowsConv.get();
  TheCall->setArg(1, RowsExpr);
} else
  RowsExpr = nullptr;

ExprResult ColumnsConv = ApplyArgumentConversions(ColumnsExpr);
if (!ColumnsConv.isInvalid()) {
  ColumnsExpr = ColumnsConv.get();
  TheCall->setArg(2, ColumnsExpr);
} else
  ColumnsExpr = nullptr;

// If any any part of the result matrix type is still pending, just use
// Context.DependentTy, until all parts are resolved.
if ((RowsExpr && RowsExpr->isTypeDependent()) ||
    (ColumnsExpr && ColumnsExpr->isTypeDependent())) {
  TheCall->setType(Context.DependentTy);
  return CallResult;
}

// Check row and column dimenions.
llvm::Optional<unsigned> MaybeRows;
if (RowsExpr)
  MaybeRows = getAndVerifyMatrixDimension(RowsExpr, "row", *this);

llvm::Optional<unsigned> MaybeColumns;
if (ColumnsExpr)
  MaybeColumns = getAndVerifyMatrixDimension(ColumnsExpr, "column", *this);

// Check stride argument.
ExprResult StrideConv = ApplyArgumentConversions(StrideExpr);
if (StrideConv.isInvalid())
  return ExprError();
StrideExpr = StrideConv.get();
TheCall->setArg(3, StrideExpr);

if (MaybeRows) {
  if (Optional<llvm::APSInt> Value =
          StrideExpr->getIntegerConstantExpr(Context)) {
    uint64_t Stride = Value->getZExtValue();
    if (Stride < *MaybeRows) {
      Diag(StrideExpr->getBeginLoc(),
           diag::err_builtin_matrix_stride_too_small);
      ArgError = true;
    }
  }
}

if (ArgError || !MaybeRows || !MaybeColumns)
  return ExprError();

TheCall->setType(
    Context.getConstantMatrixType(ElementTy, *MaybeRows, *MaybeColumns));
return CallResult;
16599}

16601ExprResult Sema::SemaBuiltinMatrixColumnMajorStore(CallExpr *TheCall,
                                                 ExprResult CallResult) {
if (checkArgCount(*this, TheCall, 3))
  return ExprError();

unsigned PtrArgIdx = 1;
Expr *MatrixExpr = TheCall->getArg(0);
Expr *PtrExpr = TheCall->getArg(PtrArgIdx);
Expr *StrideExpr = TheCall->getArg(2);

bool ArgError = false;

{
  ExprResult MatrixConv = DefaultLvalueConversion(MatrixExpr);
  if (MatrixConv.isInvalid())
    return MatrixConv;
  MatrixExpr = MatrixConv.get();
  TheCall->setArg(0, MatrixExpr);
}
if (MatrixExpr->isTypeDependent()) {
  TheCall->setType(Context.DependentTy);
  return TheCall;
}

auto *MatrixTy = MatrixExpr->getType()->getAs<ConstantMatrixType>();
if (!MatrixTy) {
  Diag(MatrixExpr->getBeginLoc(), diag::err_builtin_matrix_arg) << 0;
  ArgError = true;
}

{
  ExprResult PtrConv = DefaultFunctionArrayLvalueConversion(PtrExpr);
  if (PtrConv.isInvalid())
    return PtrConv;
  PtrExpr = PtrConv.get();
  TheCall->setArg(1, PtrExpr);
  if (PtrExpr->isTypeDependent()) {
    TheCall->setType(Context.DependentTy);
    return TheCall;
  }
}

// Check pointer argument.
auto *PtrTy = PtrExpr->getType()->getAs<PointerType>();
if (!PtrTy) {
  Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
      << PtrArgIdx + 1;
  ArgError = true;
} else {
  QualType ElementTy = PtrTy->getPointeeType();
  if (ElementTy.isConstQualified()) {
    Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_store_to_const);
    ArgError = true;
  }
  ElementTy = ElementTy.getUnqualifiedType().getCanonicalType();
  if (MatrixTy &&
      !Context.hasSameType(ElementTy, MatrixTy->getElementType())) {
    Diag(PtrExpr->getBeginLoc(),
         diag::err_builtin_matrix_pointer_arg_mismatch)
        << ElementTy << MatrixTy->getElementType();
    ArgError = true;
  }
}

// Apply default Lvalue conversions and convert the stride expression to
// size_t.
{
  ExprResult StrideConv = DefaultLvalueConversion(StrideExpr);
  if (StrideConv.isInvalid())
    return StrideConv;

  StrideConv = tryConvertExprToType(StrideConv.get(), Context.getSizeType());
  if (StrideConv.isInvalid())
    return StrideConv;
  StrideExpr = StrideConv.get();
  TheCall->setArg(2, StrideExpr);
}

// Check stride argument.
if (MatrixTy) {
  if (Optional<llvm::APSInt> Value =
          StrideExpr->getIntegerConstantExpr(Context)) {
    uint64_t Stride = Value->getZExtValue();
    if (Stride < MatrixTy->getNumRows()) {
      Diag(StrideExpr->getBeginLoc(),
           diag::err_builtin_matrix_stride_too_small);
      ArgError = true;
    }
  }
}

if (ArgError)
  return ExprError();

return CallResult;
16696}

16698/// \brief Enforce the bounds of a TCB
16699/// CheckTCBEnforcement - Enforces that every function in a named TCB only
16700/// directly calls other functions in the same TCB as marked by the enforce_tcb
16701/// and enforce_tcb_leaf attributes.
16702void Sema::CheckTCBEnforcement(const CallExpr *TheCall,
                             const FunctionDecl *Callee) {
const FunctionDecl *Caller = getCurFunctionDecl();

// Calls to builtins are not enforced.
if (!Caller || !Caller->hasAttr<EnforceTCBAttr>() ||
    Callee->getBuiltinID() != 0)
  return;

// Search through the enforce_tcb and enforce_tcb_leaf attributes to find
// all TCBs the callee is a part of.
llvm::StringSet<> CalleeTCBs;
for_each(Callee->specific_attrs<EnforceTCBAttr>(),
         [&](const auto *A) { CalleeTCBs.insert(A->getTCBName()); });
for_each(Callee->specific_attrs<EnforceTCBLeafAttr>(),
         [&](const auto *A) { CalleeTCBs.insert(A->getTCBName()); });

// Go through the TCBs the caller is a part of and emit warnings if Caller
// is in a TCB that the Callee is not.
for_each(
    Caller->specific_attrs<EnforceTCBAttr>(),
    [&](const auto *A) {
      StringRef CallerTCB = A->getTCBName();
      if (CalleeTCBs.count(CallerTCB) == 0) {
        this->Diag(TheCall->getExprLoc(),
                   diag::warn_tcb_enforcement_violation) << Callee
                                                         << CallerTCB;
      }
    });
16731}