/usr/src/gnu/usr.bin/clang/libclangCodeGen/../../../llvm/clang/lib/CodeGen/CGObjC.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/libclangCodeGen/../../../llvm/clang/lib/CodeGen/CGObjC.cpp
Warning:	line 3155, column 3 Undefined or garbage value returned to caller
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 CGObjC.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/libclangCodeGen/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangCodeGen/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangCodeGen/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangCodeGen/../include -I /usr/src/gnu/usr.bin/clang/libclangCodeGen/obj -I /usr/src/gnu/usr.bin/clang/libclangCodeGen/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/libclangCodeGen/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/libclangCodeGen/../../../llvm/clang/lib/CodeGen/CGObjC.cpp
1//===---- CGObjC.cpp - Emit LLVM Code for Objective-C ---------------------===//
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 contains code to emit Objective-C code as LLVM code.
10//
11//===----------------------------------------------------------------------===//

13#include "CGDebugInfo.h"
14#include "CGObjCRuntime.h"
15#include "CodeGenFunction.h"
16#include "CodeGenModule.h"
17#include "ConstantEmitter.h"
18#include "TargetInfo.h"
19#include "clang/AST/ASTContext.h"
20#include "clang/AST/Attr.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/StmtObjC.h"
23#include "clang/Basic/Diagnostic.h"
24#include "clang/CodeGen/CGFunctionInfo.h"
25#include "llvm/ADT/STLExtras.h"
26#include "llvm/Analysis/ObjCARCUtil.h"
27#include "llvm/BinaryFormat/MachO.h"
28#include "llvm/IR/DataLayout.h"
29#include "llvm/IR/InlineAsm.h"
30using namespace clang;
31using namespace CodeGen;

33typedef llvm::PointerIntPair<llvm::Value*,1,bool> TryEmitResult;
34static TryEmitResult
35tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e);
36static RValue AdjustObjCObjectType(CodeGenFunction &CGF,
                                 QualType ET,
                                 RValue Result);

40/// Given the address of a variable of pointer type, find the correct
41/// null to store into it.
42static llvm::Constant *getNullForVariable(Address addr) {
llvm::Type *type = addr.getElementType();
return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(type));
45}

47/// Emits an instance of NSConstantString representing the object.
48llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E)
49{
llvm::Constant *C =
    CGM.getObjCRuntime().GenerateConstantString(E->getString()).getPointer();
// FIXME: This bitcast should just be made an invariant on the Runtime.
return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
54}

56/// EmitObjCBoxedExpr - This routine generates code to call
57/// the appropriate expression boxing method. This will either be
58/// one of +[NSNumber numberWith<Type>:], or +[NSString stringWithUTF8String:],
59/// or [NSValue valueWithBytes:objCType:].
60///
61llvm::Value *
62CodeGenFunction::EmitObjCBoxedExpr(const ObjCBoxedExpr *E) {
// Generate the correct selector for this literal's concrete type.
// Get the method.
const ObjCMethodDecl *BoxingMethod = E->getBoxingMethod();
const Expr *SubExpr = E->getSubExpr();

if (E->isExpressibleAsConstantInitializer()) {
  ConstantEmitter ConstEmitter(CGM);
  return ConstEmitter.tryEmitAbstract(E, E->getType());
}

assert(BoxingMethod->isClassMethod() && "BoxingMethod must be a class method")((void)0);
Selector Sel = BoxingMethod->getSelector();

// Generate a reference to the class pointer, which will be the receiver.
// Assumes that the method was introduced in the class that should be
// messaged (avoids pulling it out of the result type).
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
const ObjCInterfaceDecl *ClassDecl = BoxingMethod->getClassInterface();
llvm::Value *Receiver = Runtime.GetClass(*this, ClassDecl);

CallArgList Args;
const ParmVarDecl *ArgDecl = *BoxingMethod->param_begin();
QualType ArgQT = ArgDecl->getType().getUnqualifiedType();

// ObjCBoxedExpr supports boxing of structs and unions
// via [NSValue valueWithBytes:objCType:]
const QualType ValueType(SubExpr->getType().getCanonicalType());
if (ValueType->isObjCBoxableRecordType()) {
  // Emit CodeGen for first parameter
  // and cast value to correct type
  Address Temporary = CreateMemTemp(SubExpr->getType());
  EmitAnyExprToMem(SubExpr, Temporary, Qualifiers(), /*isInit*/ true);
  Address BitCast = Builder.CreateBitCast(Temporary, ConvertType(ArgQT));
  Args.add(RValue::get(BitCast.getPointer()), ArgQT);

  // Create char array to store type encoding
  std::string Str;
  getContext().getObjCEncodingForType(ValueType, Str);
  llvm::Constant *GV = CGM.GetAddrOfConstantCString(Str).getPointer();

  // Cast type encoding to correct type
  const ParmVarDecl *EncodingDecl = BoxingMethod->parameters()[1];
  QualType EncodingQT = EncodingDecl->getType().getUnqualifiedType();
  llvm::Value *Cast = Builder.CreateBitCast(GV, ConvertType(EncodingQT));

  Args.add(RValue::get(Cast), EncodingQT);
} else {
  Args.add(EmitAnyExpr(SubExpr), ArgQT);
}

RValue result = Runtime.GenerateMessageSend(
    *this, ReturnValueSlot(), BoxingMethod->getReturnType(), Sel, Receiver,
    Args, ClassDecl, BoxingMethod);
return Builder.CreateBitCast(result.getScalarVal(),
                             ConvertType(E->getType()));
118}

120llvm::Value *CodeGenFunction::EmitObjCCollectionLiteral(const Expr *E,
                                  const ObjCMethodDecl *MethodWithObjects) {
ASTContext &Context = CGM.getContext();
const ObjCDictionaryLiteral *DLE = nullptr;
const ObjCArrayLiteral *ALE = dyn_cast<ObjCArrayLiteral>(E);
if (!ALE)
  DLE = cast<ObjCDictionaryLiteral>(E);

// Optimize empty collections by referencing constants, when available.
uint64_t NumElements =
  ALE ? ALE->getNumElements() : DLE->getNumElements();
if (NumElements == 0 && CGM.getLangOpts().ObjCRuntime.hasEmptyCollections()) {
  StringRef ConstantName = ALE ? "__NSArray0__" : "__NSDictionary0__";
  QualType IdTy(CGM.getContext().getObjCIdType());
  llvm::Constant *Constant =
      CGM.CreateRuntimeVariable(ConvertType(IdTy), ConstantName);
  LValue LV = MakeNaturalAlignAddrLValue(Constant, IdTy);
  llvm::Value *Ptr = EmitLoadOfScalar(LV, E->getBeginLoc());
  cast<llvm::LoadInst>(Ptr)->setMetadata(
      CGM.getModule().getMDKindID("invariant.load"),
      llvm::MDNode::get(getLLVMContext(), None));
  return Builder.CreateBitCast(Ptr, ConvertType(E->getType()));
}

// Compute the type of the array we're initializing.
llvm::APInt APNumElements(Context.getTypeSize(Context.getSizeType()),
                          NumElements);
QualType ElementType = Context.getObjCIdType().withConst();
QualType ElementArrayType
  = Context.getConstantArrayType(ElementType, APNumElements, nullptr,
                                 ArrayType::Normal, /*IndexTypeQuals=*/0);

// Allocate the temporary array(s).
Address Objects = CreateMemTemp(ElementArrayType, "objects");
Address Keys = Address::invalid();
if (DLE)
  Keys = CreateMemTemp(ElementArrayType, "keys");

// In ARC, we may need to do extra work to keep all the keys and
// values alive until after the call.
SmallVector<llvm::Value *, 16> NeededObjects;
bool TrackNeededObjects =
  (getLangOpts().ObjCAutoRefCount &&
  CGM.getCodeGenOpts().OptimizationLevel != 0);

// Perform the actual initialialization of the array(s).
for (uint64_t i = 0; i < NumElements; i++) {
  if (ALE) {
    // Emit the element and store it to the appropriate array slot.
    const Expr *Rhs = ALE->getElement(i);
    LValue LV = MakeAddrLValue(Builder.CreateConstArrayGEP(Objects, i),
                               ElementType, AlignmentSource::Decl);

    llvm::Value *value = EmitScalarExpr(Rhs);
    EmitStoreThroughLValue(RValue::get(value), LV, true);
    if (TrackNeededObjects) {
      NeededObjects.push_back(value);
    }
  } else {
    // Emit the key and store it to the appropriate array slot.
    const Expr *Key = DLE->getKeyValueElement(i).Key;
    LValue KeyLV = MakeAddrLValue(Builder.CreateConstArrayGEP(Keys, i),
                                  ElementType, AlignmentSource::Decl);
    llvm::Value *keyValue = EmitScalarExpr(Key);
    EmitStoreThroughLValue(RValue::get(keyValue), KeyLV, /*isInit=*/true);

    // Emit the value and store it to the appropriate array slot.
    const Expr *Value = DLE->getKeyValueElement(i).Value;
    LValue ValueLV = MakeAddrLValue(Builder.CreateConstArrayGEP(Objects, i),
                                    ElementType, AlignmentSource::Decl);
    llvm::Value *valueValue = EmitScalarExpr(Value);
    EmitStoreThroughLValue(RValue::get(valueValue), ValueLV, /*isInit=*/true);
    if (TrackNeededObjects) {
      NeededObjects.push_back(keyValue);
      NeededObjects.push_back(valueValue);
    }
  }
}

// Generate the argument list.
CallArgList Args;
ObjCMethodDecl::param_const_iterator PI = MethodWithObjects->param_begin();
const ParmVarDecl *argDecl = *PI++;
QualType ArgQT = argDecl->getType().getUnqualifiedType();
Args.add(RValue::get(Objects.getPointer()), ArgQT);
if (DLE) {
  argDecl = *PI++;
  ArgQT = argDecl->getType().getUnqualifiedType();
  Args.add(RValue::get(Keys.getPointer()), ArgQT);
}
argDecl = *PI;
ArgQT = argDecl->getType().getUnqualifiedType();
llvm::Value *Count =
  llvm::ConstantInt::get(CGM.getTypes().ConvertType(ArgQT), NumElements);
Args.add(RValue::get(Count), ArgQT);

// Generate a reference to the class pointer, which will be the receiver.
Selector Sel = MethodWithObjects->getSelector();
QualType ResultType = E->getType();
const ObjCObjectPointerType *InterfacePointerType
  = ResultType->getAsObjCInterfacePointerType();
ObjCInterfaceDecl *Class
  = InterfacePointerType->getObjectType()->getInterface();
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
llvm::Value *Receiver = Runtime.GetClass(*this, Class);

// Generate the message send.
RValue result = Runtime.GenerateMessageSend(
    *this, ReturnValueSlot(), MethodWithObjects->getReturnType(), Sel,
    Receiver, Args, Class, MethodWithObjects);

// The above message send needs these objects, but in ARC they are
// passed in a buffer that is essentially __unsafe_unretained.
// Therefore we must prevent the optimizer from releasing them until
// after the call.
if (TrackNeededObjects) {
  EmitARCIntrinsicUse(NeededObjects);
}

return Builder.CreateBitCast(result.getScalarVal(),
                             ConvertType(E->getType()));
241}

243llvm::Value *CodeGenFunction::EmitObjCArrayLiteral(const ObjCArrayLiteral *E) {
return EmitObjCCollectionLiteral(E, E->getArrayWithObjectsMethod());
245}

247llvm::Value *CodeGenFunction::EmitObjCDictionaryLiteral(
                                          const ObjCDictionaryLiteral *E) {
return EmitObjCCollectionLiteral(E, E->getDictWithObjectsMethod());
250}

252/// Emit a selector.
253llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) {
// Untyped selector.
// Note that this implementation allows for non-constant strings to be passed
// as arguments to @selector().  Currently, the only thing preventing this
// behaviour is the type checking in the front end.
return CGM.getObjCRuntime().GetSelector(*this, E->getSelector());
259}

261llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) {
// FIXME: This should pass the Decl not the name.
return CGM.getObjCRuntime().GenerateProtocolRef(*this, E->getProtocol());
264}

266/// Adjust the type of an Objective-C object that doesn't match up due
267/// to type erasure at various points, e.g., related result types or the use
268/// of parameterized classes.
269static RValue AdjustObjCObjectType(CodeGenFunction &CGF, QualType ExpT,
                                 RValue Result) {
if (!ExpT->isObjCRetainableType())
  return Result;

// If the converted types are the same, we're done.
llvm::Type *ExpLLVMTy = CGF.ConvertType(ExpT);
if (ExpLLVMTy == Result.getScalarVal()->getType())
  return Result;

// We have applied a substitution. Cast the rvalue appropriately.
return RValue::get(CGF.Builder.CreateBitCast(Result.getScalarVal(),
                                             ExpLLVMTy));
282}

284/// Decide whether to extend the lifetime of the receiver of a
285/// returns-inner-pointer message.
286static bool
287shouldExtendReceiverForInnerPointerMessage(const ObjCMessageExpr *message) {
switch (message->getReceiverKind()) {

// For a normal instance message, we should extend unless the
// receiver is loaded from a variable with precise lifetime.
case ObjCMessageExpr::Instance: {
  const Expr *receiver = message->getInstanceReceiver();

  // Look through OVEs.
  if (auto opaque = dyn_cast<OpaqueValueExpr>(receiver)) {
    if (opaque->getSourceExpr())
      receiver = opaque->getSourceExpr()->IgnoreParens();
  }

  const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(receiver);
  if (!ice || ice->getCastKind() != CK_LValueToRValue) return true;
  receiver = ice->getSubExpr()->IgnoreParens();

  // Look through OVEs.
  if (auto opaque = dyn_cast<OpaqueValueExpr>(receiver)) {
    if (opaque->getSourceExpr())
      receiver = opaque->getSourceExpr()->IgnoreParens();
  }

  // Only __strong variables.
  if (receiver->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
    return true;

  // All ivars and fields have precise lifetime.
  if (isa<MemberExpr>(receiver) || isa<ObjCIvarRefExpr>(receiver))
    return false;

  // Otherwise, check for variables.
  const DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(ice->getSubExpr());
  if (!declRef) return true;
  const VarDecl *var = dyn_cast<VarDecl>(declRef->getDecl());
  if (!var) return true;

  // All variables have precise lifetime except local variables with
  // automatic storage duration that aren't specially marked.
  return (var->hasLocalStorage() &&
          !var->hasAttr<ObjCPreciseLifetimeAttr>());
}

case ObjCMessageExpr::Class:
case ObjCMessageExpr::SuperClass:
  // It's never necessary for class objects.
  return false;

case ObjCMessageExpr::SuperInstance:
  // We generally assume that 'self' lives throughout a method call.
  return false;
}

llvm_unreachable("invalid receiver kind")__builtin_unreachable();
342}

344/// Given an expression of ObjC pointer type, check whether it was
345/// immediately loaded from an ARC __weak l-value.
346static const Expr *findWeakLValue(const Expr *E) {
assert(E->getType()->isObjCRetainableType())((void)0);
E = E->IgnoreParens();
if (auto CE = dyn_cast<CastExpr>(E)) {
  if (CE->getCastKind() == CK_LValueToRValue) {
    if (CE->getSubExpr()->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
      return CE->getSubExpr();
  }
}

return nullptr;
357}

359/// The ObjC runtime may provide entrypoints that are likely to be faster
360/// than an ordinary message send of the appropriate selector.
361///
362/// The entrypoints are guaranteed to be equivalent to just sending the
363/// corresponding message.  If the entrypoint is implemented naively as just a
364/// message send, using it is a trade-off: it sacrifices a few cycles of
365/// overhead to save a small amount of code.  However, it's possible for
366/// runtimes to detect and special-case classes that use "standard"
367/// behavior; if that's dynamically a large proportion of all objects, using
368/// the entrypoint will also be faster than using a message send.
369///
370/// If the runtime does support a required entrypoint, then this method will
371/// generate a call and return the resulting value.  Otherwise it will return
372/// None and the caller can generate a msgSend instead.
373static Optional<llvm::Value *>
374tryGenerateSpecializedMessageSend(CodeGenFunction &CGF, QualType ResultType,
                                llvm::Value *Receiver,
                                const CallArgList& Args, Selector Sel,
                                const ObjCMethodDecl *method,
                                bool isClassMessage) {
auto &CGM = CGF.CGM;
if (!CGM.getCodeGenOpts().ObjCConvertMessagesToRuntimeCalls)
  return None;

auto &Runtime = CGM.getLangOpts().ObjCRuntime;
switch (Sel.getMethodFamily()) {
case OMF_alloc:
  if (isClassMessage &&
      Runtime.shouldUseRuntimeFunctionsForAlloc() &&
      ResultType->isObjCObjectPointerType()) {
      // [Foo alloc] -> objc_alloc(Foo) or
      // [self alloc] -> objc_alloc(self)
      if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "alloc")
        return CGF.EmitObjCAlloc(Receiver, CGF.ConvertType(ResultType));
      // [Foo allocWithZone:nil] -> objc_allocWithZone(Foo) or
      // [self allocWithZone:nil] -> objc_allocWithZone(self)
      if (Sel.isKeywordSelector() && Sel.getNumArgs() == 1 &&
          Args.size() == 1 && Args.front().getType()->isPointerType() &&
          Sel.getNameForSlot(0) == "allocWithZone") {
        const llvm::Value* arg = Args.front().getKnownRValue().getScalarVal();
        if (isa<llvm::ConstantPointerNull>(arg))
          return CGF.EmitObjCAllocWithZone(Receiver,
                                           CGF.ConvertType(ResultType));
        return None;
      }
  }
  break;

case OMF_autorelease:
  if (ResultType->isObjCObjectPointerType() &&
      CGM.getLangOpts().getGC() == LangOptions::NonGC &&
      Runtime.shouldUseARCFunctionsForRetainRelease())
    return CGF.EmitObjCAutorelease(Receiver, CGF.ConvertType(ResultType));
  break;

case OMF_retain:
  if (ResultType->isObjCObjectPointerType() &&
      CGM.getLangOpts().getGC() == LangOptions::NonGC &&
      Runtime.shouldUseARCFunctionsForRetainRelease())
    return CGF.EmitObjCRetainNonBlock(Receiver, CGF.ConvertType(ResultType));
  break;

case OMF_release:
  if (ResultType->isVoidType() &&
      CGM.getLangOpts().getGC() == LangOptions::NonGC &&
      Runtime.shouldUseARCFunctionsForRetainRelease()) {
    CGF.EmitObjCRelease(Receiver, ARCPreciseLifetime);
    return nullptr;
  }
  break;

default:
  break;
}
return None;
434}

436CodeGen::RValue CGObjCRuntime::GeneratePossiblySpecializedMessageSend(
  CodeGenFunction &CGF, ReturnValueSlot Return, QualType ResultType,
  Selector Sel, llvm::Value *Receiver, const CallArgList &Args,
  const ObjCInterfaceDecl *OID, const ObjCMethodDecl *Method,
  bool isClassMessage) {
if (Optional<llvm::Value *> SpecializedResult =
        tryGenerateSpecializedMessageSend(CGF, ResultType, Receiver, Args,
                                          Sel, Method, isClassMessage)) {
  return RValue::get(SpecializedResult.getValue());
}
return GenerateMessageSend(CGF, Return, ResultType, Sel, Receiver, Args, OID,
                           Method);
448}

450static void AppendFirstImpliedRuntimeProtocols(
  const ObjCProtocolDecl *PD,
  llvm::UniqueVector<const ObjCProtocolDecl *> &PDs) {
if (!PD->isNonRuntimeProtocol()) {
  const auto *Can = PD->getCanonicalDecl();
  PDs.insert(Can);
  return;
}

for (const auto *ParentPD : PD->protocols())
  AppendFirstImpliedRuntimeProtocols(ParentPD, PDs);
461}

463std::vector<const ObjCProtocolDecl *>
464CGObjCRuntime::GetRuntimeProtocolList(ObjCProtocolDecl::protocol_iterator begin,
                                    ObjCProtocolDecl::protocol_iterator end) {
std::vector<const ObjCProtocolDecl *> RuntimePds;
llvm::DenseSet<const ObjCProtocolDecl *> NonRuntimePDs;

for (; begin != end; ++begin) {
  const auto *It = *begin;
  const auto *Can = It->getCanonicalDecl();
  if (Can->isNonRuntimeProtocol())
    NonRuntimePDs.insert(Can);
  else
    RuntimePds.push_back(Can);
}

// If there are no non-runtime protocols then we can just stop now.
if (NonRuntimePDs.empty())
  return RuntimePds;

// Else we have to search through the non-runtime protocol's inheritancy
// hierarchy DAG stopping whenever a branch either finds a runtime protocol or
// a non-runtime protocol without any parents. These are the "first-implied"
// protocols from a non-runtime protocol.
llvm::UniqueVector<const ObjCProtocolDecl *> FirstImpliedProtos;
for (const auto *PD : NonRuntimePDs)
  AppendFirstImpliedRuntimeProtocols(PD, FirstImpliedProtos);

// Walk the Runtime list to get all protocols implied via the inclusion of
// this protocol, e.g. all protocols it inherits from including itself.
llvm::DenseSet<const ObjCProtocolDecl *> AllImpliedProtocols;
for (const auto *PD : RuntimePds) {
  const auto *Can = PD->getCanonicalDecl();
  AllImpliedProtocols.insert(Can);
  Can->getImpliedProtocols(AllImpliedProtocols);
}

// Similar to above, walk the list of first-implied protocols to find the set
// all the protocols implied excluding the listed protocols themselves since
// they are not yet a part of the `RuntimePds` list.
for (const auto *PD : FirstImpliedProtos) {
  PD->getImpliedProtocols(AllImpliedProtocols);
}

// From the first-implied list we have to finish building the final protocol
// list. If a protocol in the first-implied list was already implied via some
// inheritance path through some other protocols then it would be redundant to
// add it here and so we skip over it.
for (const auto *PD : FirstImpliedProtos) {
  if (!AllImpliedProtocols.contains(PD)) {
    RuntimePds.push_back(PD);
  }
}

return RuntimePds;
517}

519/// Instead of '[[MyClass alloc] init]', try to generate
520/// 'objc_alloc_init(MyClass)'. This provides a code size improvement on the
521/// caller side, as well as the optimized objc_alloc.
522static Optional<llvm::Value *>
523tryEmitSpecializedAllocInit(CodeGenFunction &CGF, const ObjCMessageExpr *OME) {
auto &Runtime = CGF.getLangOpts().ObjCRuntime;
if (!Runtime.shouldUseRuntimeFunctionForCombinedAllocInit())
  return None;

// Match the exact pattern '[[MyClass alloc] init]'.
Selector Sel = OME->getSelector();
if (OME->getReceiverKind() != ObjCMessageExpr::Instance ||
    !OME->getType()->isObjCObjectPointerType() || !Sel.isUnarySelector() ||
    Sel.getNameForSlot(0) != "init")
  return None;

// Okay, this is '[receiver init]', check if 'receiver' is '[cls alloc]'
// with 'cls' a Class.
auto *SubOME =
    dyn_cast<ObjCMessageExpr>(OME->getInstanceReceiver()->IgnoreParenCasts());
if (!SubOME)
  return None;
Selector SubSel = SubOME->getSelector();

if (!SubOME->getType()->isObjCObjectPointerType() ||
    !SubSel.isUnarySelector() || SubSel.getNameForSlot(0) != "alloc")
  return None;

llvm::Value *Receiver = nullptr;
switch (SubOME->getReceiverKind()) {
case ObjCMessageExpr::Instance:
  if (!SubOME->getInstanceReceiver()->getType()->isObjCClassType())
    return None;
  Receiver = CGF.EmitScalarExpr(SubOME->getInstanceReceiver());
  break;

case ObjCMessageExpr::Class: {
  QualType ReceiverType = SubOME->getClassReceiver();
  const ObjCObjectType *ObjTy = ReceiverType->castAs<ObjCObjectType>();
  const ObjCInterfaceDecl *ID = ObjTy->getInterface();
  assert(ID && "null interface should be impossible here")((void)0);
  Receiver = CGF.CGM.getObjCRuntime().GetClass(CGF, ID);
  break;
}
case ObjCMessageExpr::SuperInstance:
case ObjCMessageExpr::SuperClass:
  return None;
}

return CGF.EmitObjCAllocInit(Receiver, CGF.ConvertType(OME->getType()));
569}

571RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E,
                                          ReturnValueSlot Return) {
// Only the lookup mechanism and first two arguments of the method
// implementation vary between runtimes.  We can get the receiver and
// arguments in generic code.

bool isDelegateInit = E->isDelegateInitCall();

const ObjCMethodDecl *method = E->getMethodDecl();

// If the method is -retain, and the receiver's being loaded from
// a __weak variable, peephole the entire operation to objc_loadWeakRetained.
if (method && E->getReceiverKind() == ObjCMessageExpr::Instance &&
    method->getMethodFamily() == OMF_retain) {
  if (auto lvalueExpr = findWeakLValue(E->getInstanceReceiver())) {
    LValue lvalue = EmitLValue(lvalueExpr);
    llvm::Value *result = EmitARCLoadWeakRetained(lvalue.getAddress(*this));
    return AdjustObjCObjectType(*this, E->getType(), RValue::get(result));
  }
}

if (Optional<llvm::Value *> Val = tryEmitSpecializedAllocInit(*this, E))
  return AdjustObjCObjectType(*this, E->getType(), RValue::get(*Val));

// We don't retain the receiver in delegate init calls, and this is
// safe because the receiver value is always loaded from 'self',
// which we zero out.  We don't want to Block_copy block receivers,
// though.
bool retainSelf =
  (!isDelegateInit &&
   CGM.getLangOpts().ObjCAutoRefCount &&
   method &&
   method->hasAttr<NSConsumesSelfAttr>());

CGObjCRuntime &Runtime = CGM.getObjCRuntime();
bool isSuperMessage = false;
bool isClassMessage = false;
ObjCInterfaceDecl *OID = nullptr;
// Find the receiver
QualType ReceiverType;
llvm::Value *Receiver = nullptr;
switch (E->getReceiverKind()) {
case ObjCMessageExpr::Instance:
  ReceiverType = E->getInstanceReceiver()->getType();
  isClassMessage = ReceiverType->isObjCClassType();
  if (retainSelf) {
    TryEmitResult ter = tryEmitARCRetainScalarExpr(*this,
                                                 E->getInstanceReceiver());
    Receiver = ter.getPointer();
    if (ter.getInt()) retainSelf = false;
  } else
    Receiver = EmitScalarExpr(E->getInstanceReceiver());
  break;

case ObjCMessageExpr::Class: {
  ReceiverType = E->getClassReceiver();
  OID = ReceiverType->castAs<ObjCObjectType>()->getInterface();
  assert(OID && "Invalid Objective-C class message send")((void)0);
  Receiver = Runtime.GetClass(*this, OID);
  isClassMessage = true;
  break;
}

case ObjCMessageExpr::SuperInstance:
  ReceiverType = E->getSuperType();
  Receiver = LoadObjCSelf();
  isSuperMessage = true;
  break;

case ObjCMessageExpr::SuperClass:
  ReceiverType = E->getSuperType();
  Receiver = LoadObjCSelf();
  isSuperMessage = true;
  isClassMessage = true;
  break;
}

if (retainSelf)
  Receiver = EmitARCRetainNonBlock(Receiver);

// In ARC, we sometimes want to "extend the lifetime"
// (i.e. retain+autorelease) of receivers of returns-inner-pointer
// messages.
if (getLangOpts().ObjCAutoRefCount && method &&
    method->hasAttr<ObjCReturnsInnerPointerAttr>() &&
    shouldExtendReceiverForInnerPointerMessage(E))
  Receiver = EmitARCRetainAutorelease(ReceiverType, Receiver);

QualType ResultType = method ? method->getReturnType() : E->getType();

CallArgList Args;
EmitCallArgs(Args, method, E->arguments(), /*AC*/AbstractCallee(method));

// For delegate init calls in ARC, do an unsafe store of null into
// self.  This represents the call taking direct ownership of that
// value.  We have to do this after emitting the other call
// arguments because they might also reference self, but we don't
// have to worry about any of them modifying self because that would
// be an undefined read and write of an object in unordered
// expressions.
if (isDelegateInit) {
  assert(getLangOpts().ObjCAutoRefCount &&((void)0)
         "delegate init calls should only be marked in ARC")((void)0);

  // Do an unsafe store of null into self.
  Address selfAddr =
    GetAddrOfLocalVar(cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl());
  Builder.CreateStore(getNullForVariable(selfAddr), selfAddr);
}

RValue result;
if (isSuperMessage) {
  // super is only valid in an Objective-C method
  const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
  bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext());
  result = Runtime.GenerateMessageSendSuper(*this, Return, ResultType,
                                            E->getSelector(),
                                            OMD->getClassInterface(),
                                            isCategoryImpl,
                                            Receiver,
                                            isClassMessage,
                                            Args,
                                            method);
} else {
  // Call runtime methods directly if we can.
  result = Runtime.GeneratePossiblySpecializedMessageSend(
      *this, Return, ResultType, E->getSelector(), Receiver, Args, OID,
      method, isClassMessage);
}

// For delegate init calls in ARC, implicitly store the result of
// the call back into self.  This takes ownership of the value.
if (isDelegateInit) {
  Address selfAddr =
    GetAddrOfLocalVar(cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl());
  llvm::Value *newSelf = result.getScalarVal();

  // The delegate return type isn't necessarily a matching type; in
  // fact, it's quite likely to be 'id'.
  llvm::Type *selfTy = selfAddr.getElementType();
  newSelf = Builder.CreateBitCast(newSelf, selfTy);

  Builder.CreateStore(newSelf, selfAddr);
}

return AdjustObjCObjectType(*this, E->getType(), result);
717}

719namespace {
720struct FinishARCDealloc final : EHScopeStack::Cleanup {
void Emit(CodeGenFunction &CGF, Flags flags) override {
  const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CGF.CurCodeDecl);

  const ObjCImplDecl *impl = cast<ObjCImplDecl>(method->getDeclContext());
  const ObjCInterfaceDecl *iface = impl->getClassInterface();
  if (!iface->getSuperClass()) return;

  bool isCategory = isa<ObjCCategoryImplDecl>(impl);

  // Call [super dealloc] if we have a superclass.
  llvm::Value *self = CGF.LoadObjCSelf();

  CallArgList args;
  CGF.CGM.getObjCRuntime().GenerateMessageSendSuper(CGF, ReturnValueSlot(),
                                                    CGF.getContext().VoidTy,
                                                    method->getSelector(),
                                                    iface,
                                                    isCategory,
                                                    self,
                                                    /*is class msg*/ false,
                                                    args,
                                                    method);
}
744};
745}

747/// StartObjCMethod - Begin emission of an ObjCMethod. This generates
748/// the LLVM function and sets the other context used by
749/// CodeGenFunction.
750void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD,
                                    const ObjCContainerDecl *CD) {
SourceLocation StartLoc = OMD->getBeginLoc();
FunctionArgList args;
// Check if we should generate debug info for this method.
if (OMD->hasAttr<NoDebugAttr>())
  DebugInfo = nullptr; // disable debug info indefinitely for this function

llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD);

const CGFunctionInfo &FI = CGM.getTypes().arrangeObjCMethodDeclaration(OMD);
if (OMD->isDirectMethod()) {
  Fn->setVisibility(llvm::Function::HiddenVisibility);
  CGM.SetLLVMFunctionAttributes(OMD, FI, Fn, /*IsThunk=*/false);
  CGM.SetLLVMFunctionAttributesForDefinition(OMD, Fn);
} else {
  CGM.SetInternalFunctionAttributes(OMD, Fn, FI);
}

args.push_back(OMD->getSelfDecl());
args.push_back(OMD->getCmdDecl());

args.append(OMD->param_begin(), OMD->param_end());

CurGD = OMD;
CurEHLocation = OMD->getEndLoc();

StartFunction(OMD, OMD->getReturnType(), Fn, FI, args,
              OMD->getLocation(), StartLoc);

if (OMD->isDirectMethod()) {
  // This function is a direct call, it has to implement a nil check
  // on entry.
  //
  // TODO: possibly have several entry points to elide the check
  CGM.getObjCRuntime().GenerateDirectMethodPrologue(*this, Fn, OMD, CD);
}

// In ARC, certain methods get an extra cleanup.
if (CGM.getLangOpts().ObjCAutoRefCount &&
    OMD->isInstanceMethod() &&
    OMD->getSelector().isUnarySelector()) {
  const IdentifierInfo *ident =
    OMD->getSelector().getIdentifierInfoForSlot(0);
  if (ident->isStr("dealloc"))
    EHStack.pushCleanup<FinishARCDealloc>(getARCCleanupKind());
}
797}

799static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF,
                                            LValue lvalue, QualType type);

802/// Generate an Objective-C method.  An Objective-C method is a C function with
803/// its pointer, name, and types registered in the class structure.
804void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) {
StartObjCMethod(OMD, OMD->getClassInterface());
PGO.assignRegionCounters(GlobalDecl(OMD), CurFn);
assert(isa<CompoundStmt>(OMD->getBody()))((void)0);
incrementProfileCounter(OMD->getBody());
EmitCompoundStmtWithoutScope(*cast<CompoundStmt>(OMD->getBody()));
FinishFunction(OMD->getBodyRBrace());
811}

813/// emitStructGetterCall - Call the runtime function to load a property
814/// into the return value slot.
815static void emitStructGetterCall(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
                               bool isAtomic, bool hasStrong) {
ASTContext &Context = CGF.getContext();

Address src =
    CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(), ivar, 0)
        .getAddress(CGF);

// objc_copyStruct (ReturnValue, &structIvar,
//                  sizeof (Type of Ivar), isAtomic, false);
CallArgList args;

Address dest = CGF.Builder.CreateBitCast(CGF.ReturnValue, CGF.VoidPtrTy);
args.add(RValue::get(dest.getPointer()), Context.VoidPtrTy);

src = CGF.Builder.CreateBitCast(src, CGF.VoidPtrTy);
args.add(RValue::get(src.getPointer()), Context.VoidPtrTy);

CharUnits size = CGF.getContext().getTypeSizeInChars(ivar->getType());
args.add(RValue::get(CGF.CGM.getSize(size)), Context.getSizeType());
args.add(RValue::get(CGF.Builder.getInt1(isAtomic)), Context.BoolTy);
args.add(RValue::get(CGF.Builder.getInt1(hasStrong)), Context.BoolTy);

llvm::FunctionCallee fn = CGF.CGM.getObjCRuntime().GetGetStructFunction();
CGCallee callee = CGCallee::forDirect(fn);
CGF.EmitCall(CGF.getTypes().arrangeBuiltinFunctionCall(Context.VoidTy, args),
             callee, ReturnValueSlot(), args);
842}

844/// Determine whether the given architecture supports unaligned atomic
845/// accesses.  They don't have to be fast, just faster than a function
846/// call and a mutex.
847static bool hasUnalignedAtomics(llvm::Triple::ArchType arch) {
// FIXME: Allow unaligned atomic load/store on x86.  (It is not
// currently supported by the backend.)
return 0;
851}

853/// Return the maximum size that permits atomic accesses for the given
854/// architecture.
855static CharUnits getMaxAtomicAccessSize(CodeGenModule &CGM,
                                      llvm::Triple::ArchType arch) {
// ARM has 8-byte atomic accesses, but it's not clear whether we
// want to rely on them here.

// In the default case, just assume that any size up to a pointer is
// fine given adequate alignment.
return CharUnits::fromQuantity(CGM.PointerSizeInBytes);
863}

865namespace {
class PropertyImplStrategy {
public:
  enum StrategyKind {
    /// The 'native' strategy is to use the architecture's provided
    /// reads and writes.
    Native,

    /// Use objc_setProperty and objc_getProperty.
    GetSetProperty,

    /// Use objc_setProperty for the setter, but use expression
    /// evaluation for the getter.
    SetPropertyAndExpressionGet,

    /// Use objc_copyStruct.
    CopyStruct,

    /// The 'expression' strategy is to emit normal assignment or
    /// lvalue-to-rvalue expressions.
    Expression
  };

  StrategyKind getKind() const { return StrategyKind(Kind); }

  bool hasStrongMember() const { return HasStrong; }
  bool isAtomic() const { return IsAtomic; }
  bool isCopy() const { return IsCopy; }

  CharUnits getIvarSize() const { return IvarSize; }
  CharUnits getIvarAlignment() const { return IvarAlignment; }

  PropertyImplStrategy(CodeGenModule &CGM,
                       const ObjCPropertyImplDecl *propImpl);

private:
  unsigned Kind : 8;
  unsigned IsAtomic : 1;
  unsigned IsCopy : 1;
  unsigned HasStrong : 1;

  CharUnits IvarSize;
  CharUnits IvarAlignment;
};
909}

911/// Pick an implementation strategy for the given property synthesis.
912PropertyImplStrategy::PropertyImplStrategy(CodeGenModule &CGM,
                                   const ObjCPropertyImplDecl *propImpl) {
const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
ObjCPropertyDecl::SetterKind setterKind = prop->getSetterKind();

IsCopy = (setterKind == ObjCPropertyDecl::Copy);
IsAtomic = prop->isAtomic();
HasStrong = false; // doesn't matter here.

// Evaluate the ivar's size and alignment.
ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
QualType ivarType = ivar->getType();
auto TInfo = CGM.getContext().getTypeInfoInChars(ivarType);
IvarSize = TInfo.Width;
IvarAlignment = TInfo.Align;

// If we have a copy property, we always have to use setProperty.
// If the property is atomic we need to use getProperty, but in
// the nonatomic case we can just use expression.
if (IsCopy) {
  Kind = IsAtomic ? GetSetProperty : SetPropertyAndExpressionGet;
  return;
}

// Handle retain.
if (setterKind == ObjCPropertyDecl::Retain) {
  // In GC-only, there's nothing special that needs to be done.
  if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
    // fallthrough

  // In ARC, if the property is non-atomic, use expression emission,
  // which translates to objc_storeStrong.  This isn't required, but
  // it's slightly nicer.
  } else if (CGM.getLangOpts().ObjCAutoRefCount && !IsAtomic) {
    // Using standard expression emission for the setter is only
    // acceptable if the ivar is __strong, which won't be true if
    // the property is annotated with __attribute__((NSObject)).
    // TODO: falling all the way back to objc_setProperty here is
    // just laziness, though;  we could still use objc_storeStrong
    // if we hacked it right.
    if (ivarType.getObjCLifetime() == Qualifiers::OCL_Strong)
      Kind = Expression;
    else
      Kind = SetPropertyAndExpressionGet;
    return;

  // Otherwise, we need to at least use setProperty.  However, if
  // the property isn't atomic, we can use normal expression
  // emission for the getter.
  } else if (!IsAtomic) {
    Kind = SetPropertyAndExpressionGet;
    return;

  // Otherwise, we have to use both setProperty and getProperty.
  } else {
    Kind = GetSetProperty;
    return;
  }
}

// If we're not atomic, just use expression accesses.
if (!IsAtomic) {
  Kind = Expression;
  return;
}

// Properties on bitfield ivars need to be emitted using expression
// accesses even if they're nominally atomic.
if (ivar->isBitField()) {
  Kind = Expression;
  return;
}

// GC-qualified or ARC-qualified ivars need to be emitted as
// expressions.  This actually works out to being atomic anyway,
// except for ARC __strong, but that should trigger the above code.
if (ivarType.hasNonTrivialObjCLifetime() ||
    (CGM.getLangOpts().getGC() &&
     CGM.getContext().getObjCGCAttrKind(ivarType))) {
  Kind = Expression;
  return;
}

// Compute whether the ivar has strong members.
if (CGM.getLangOpts().getGC())
  if (const RecordType *recordType = ivarType->getAs<RecordType>())
    HasStrong = recordType->getDecl()->hasObjectMember();

// We can never access structs with object members with a native
// access, because we need to use write barriers.  This is what
// objc_copyStruct is for.
if (HasStrong) {
  Kind = CopyStruct;
  return;
}

// Otherwise, this is target-dependent and based on the size and
// alignment of the ivar.

// If the size of the ivar is not a power of two, give up.  We don't
// want to get into the business of doing compare-and-swaps.
if (!IvarSize.isPowerOfTwo()) {
  Kind = CopyStruct;
  return;
}

llvm::Triple::ArchType arch =
  CGM.getTarget().getTriple().getArch();

// Most architectures require memory to fit within a single cache
// line, so the alignment has to be at least the size of the access.
// Otherwise we have to grab a lock.
if (IvarAlignment < IvarSize && !hasUnalignedAtomics(arch)) {
  Kind = CopyStruct;
  return;
}

// If the ivar's size exceeds the architecture's maximum atomic
// access size, we have to use CopyStruct.
if (IvarSize > getMaxAtomicAccessSize(CGM, arch)) {
  Kind = CopyStruct;
  return;
}

// Otherwise, we can use native loads and stores.
Kind = Native;
1038}

1040/// Generate an Objective-C property getter function.
1041///
1042/// The given Decl must be an ObjCImplementationDecl. \@synthesize
1043/// is illegal within a category.
1044void CodeGenFunction::GenerateObjCGetter(ObjCImplementationDecl *IMP,
                                       const ObjCPropertyImplDecl *PID) {
llvm::Constant *AtomicHelperFn =
    CodeGenFunction(CGM).GenerateObjCAtomicGetterCopyHelperFunction(PID);
ObjCMethodDecl *OMD = PID->getGetterMethodDecl();
assert(OMD && "Invalid call to generate getter (empty method)")((void)0);
StartObjCMethod(OMD, IMP->getClassInterface());

generateObjCGetterBody(IMP, PID, OMD, AtomicHelperFn);

FinishFunction(OMD->getEndLoc());
1055}

1057static bool hasTrivialGetExpr(const ObjCPropertyImplDecl *propImpl) {
const Expr *getter = propImpl->getGetterCXXConstructor();
if (!getter) return true;

// Sema only makes only of these when the ivar has a C++ class type,
// so the form is pretty constrained.

// If the property has a reference type, we might just be binding a
// reference, in which case the result will be a gl-value.  We should
// treat this as a non-trivial operation.
if (getter->isGLValue())
  return false;

// If we selected a trivial copy-constructor, we're okay.
if (const CXXConstructExpr *construct = dyn_cast<CXXConstructExpr>(getter))
  return (construct->getConstructor()->isTrivial());

// The constructor might require cleanups (in which case it's never
// trivial).
assert(isa<ExprWithCleanups>(getter))((void)0);
return false;
1078}

1080/// emitCPPObjectAtomicGetterCall - Call the runtime function to
1081/// copy the ivar into the resturn slot.
1082static void emitCPPObjectAtomicGetterCall(CodeGenFunction &CGF,
                                        llvm::Value *returnAddr,
                                        ObjCIvarDecl *ivar,
                                        llvm::Constant *AtomicHelperFn) {
// objc_copyCppObjectAtomic (&returnSlot, &CppObjectIvar,
//                           AtomicHelperFn);
CallArgList args;

// The 1st argument is the return Slot.
args.add(RValue::get(returnAddr), CGF.getContext().VoidPtrTy);

// The 2nd argument is the address of the ivar.
llvm::Value *ivarAddr =
    CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(), ivar, 0)
        .getPointer(CGF);
ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);

// Third argument is the helper function.
args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);

llvm::FunctionCallee copyCppAtomicObjectFn =
    CGF.CGM.getObjCRuntime().GetCppAtomicObjectGetFunction();
CGCallee callee = CGCallee::forDirect(copyCppAtomicObjectFn);
CGF.EmitCall(
    CGF.getTypes().arrangeBuiltinFunctionCall(CGF.getContext().VoidTy, args),
             callee, ReturnValueSlot(), args);
1109}

1111void
1112CodeGenFunction::generateObjCGetterBody(const ObjCImplementationDecl *classImpl,
                                      const ObjCPropertyImplDecl *propImpl,
                                      const ObjCMethodDecl *GetterMethodDecl,
                                      llvm::Constant *AtomicHelperFn) {
// If there's a non-trivial 'get' expression, we just have to emit that.
if (!hasTrivialGetExpr(propImpl)) {
  if (!AtomicHelperFn) {
    auto *ret = ReturnStmt::Create(getContext(), SourceLocation(),
                                   propImpl->getGetterCXXConstructor(),
                                   /* NRVOCandidate=*/nullptr);
    EmitReturnStmt(*ret);
  }
  else {
    ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
    emitCPPObjectAtomicGetterCall(*this, ReturnValue.getPointer(),
                                  ivar, AtomicHelperFn);
  }
  return;
}

const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
QualType propType = prop->getType();
ObjCMethodDecl *getterMethod = propImpl->getGetterMethodDecl();

ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();

// Pick an implementation strategy.
PropertyImplStrategy strategy(CGM, propImpl);
switch (strategy.getKind()) {
case PropertyImplStrategy::Native: {
  // We don't need to do anything for a zero-size struct.
  if (strategy.getIvarSize().isZero())
    return;

  LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, 0);

  // Currently, all atomic accesses have to be through integer
  // types, so there's no point in trying to pick a prettier type.
  uint64_t ivarSize = getContext().toBits(strategy.getIvarSize());
  llvm::Type *bitcastType = llvm::Type::getIntNTy(getLLVMContext(), ivarSize);
  bitcastType = bitcastType->getPointerTo(); // addrspace 0 okay

  // Perform an atomic load.  This does not impose ordering constraints.
  Address ivarAddr = LV.getAddress(*this);
  ivarAddr = Builder.CreateBitCast(ivarAddr, bitcastType);
  llvm::LoadInst *load = Builder.CreateLoad(ivarAddr, "load");
  load->setAtomic(llvm::AtomicOrdering::Unordered);

  // Store that value into the return address.  Doing this with a
  // bitcast is likely to produce some pretty ugly IR, but it's not
  // the *most* terrible thing in the world.
  llvm::Type *retTy = ConvertType(getterMethod->getReturnType());
  uint64_t retTySize = CGM.getDataLayout().getTypeSizeInBits(retTy);
  llvm::Value *ivarVal = load;
  if (ivarSize > retTySize) {
    llvm::Type *newTy = llvm::Type::getIntNTy(getLLVMContext(), retTySize);
    ivarVal = Builder.CreateTrunc(load, newTy);
    bitcastType = newTy->getPointerTo();
  }
  Builder.CreateStore(ivarVal,
                      Builder.CreateBitCast(ReturnValue, bitcastType));

  // Make sure we don't do an autorelease.
  AutoreleaseResult = false;
  return;
}

case PropertyImplStrategy::GetSetProperty: {
  llvm::FunctionCallee getPropertyFn =
      CGM.getObjCRuntime().GetPropertyGetFunction();
  if (!getPropertyFn) {
    CGM.ErrorUnsupported(propImpl, "Obj-C getter requiring atomic copy");
    return;
  }
  CGCallee callee = CGCallee::forDirect(getPropertyFn);

  // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true).
  // FIXME: Can't this be simpler? This might even be worse than the
  // corresponding gcc code.
  llvm::Value *cmd =
    Builder.CreateLoad(GetAddrOfLocalVar(getterMethod->getCmdDecl()), "cmd");
  llvm::Value *self = Builder.CreateBitCast(LoadObjCSelf(), VoidPtrTy);
  llvm::Value *ivarOffset =
    EmitIvarOffset(classImpl->getClassInterface(), ivar);

  CallArgList args;
  args.add(RValue::get(self), getContext().getObjCIdType());
  args.add(RValue::get(cmd), getContext().getObjCSelType());
  args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
  args.add(RValue::get(Builder.getInt1(strategy.isAtomic())),
           getContext().BoolTy);

  // FIXME: We shouldn't need to get the function info here, the
  // runtime already should have computed it to build the function.
  llvm::CallBase *CallInstruction;
  RValue RV = EmitCall(getTypes().arrangeBuiltinFunctionCall(
                           getContext().getObjCIdType(), args),
                       callee, ReturnValueSlot(), args, &CallInstruction);
  if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(CallInstruction))
    call->setTailCall();

  // We need to fix the type here. Ivars with copy & retain are
  // always objects so we don't need to worry about complex or
  // aggregates.
  RV = RValue::get(Builder.CreateBitCast(
      RV.getScalarVal(),
      getTypes().ConvertType(getterMethod->getReturnType())));

  EmitReturnOfRValue(RV, propType);

  // objc_getProperty does an autorelease, so we should suppress ours.
  AutoreleaseResult = false;

  return;
}

case PropertyImplStrategy::CopyStruct:
  emitStructGetterCall(*this, ivar, strategy.isAtomic(),
                       strategy.hasStrongMember());
  return;

case PropertyImplStrategy::Expression:
case PropertyImplStrategy::SetPropertyAndExpressionGet: {
  LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, 0);

  QualType ivarType = ivar->getType();
  switch (getEvaluationKind(ivarType)) {
  case TEK_Complex: {
    ComplexPairTy pair = EmitLoadOfComplex(LV, SourceLocation());
    EmitStoreOfComplex(pair, MakeAddrLValue(ReturnValue, ivarType),
                       /*init*/ true);
    return;
  }
  case TEK_Aggregate: {
    // The return value slot is guaranteed to not be aliased, but
    // that's not necessarily the same as "on the stack", so
    // we still potentially need objc_memmove_collectable.
    EmitAggregateCopy(/* Dest= */ MakeAddrLValue(ReturnValue, ivarType),
                      /* Src= */ LV, ivarType, getOverlapForReturnValue());
    return;
  }
  case TEK_Scalar: {
    llvm::Value *value;
    if (propType->isReferenceType()) {
      value = LV.getAddress(*this).getPointer();
    } else {
      // We want to load and autoreleaseReturnValue ARC __weak ivars.
      if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
        if (getLangOpts().ObjCAutoRefCount) {
          value = emitARCRetainLoadOfScalar(*this, LV, ivarType);
        } else {
          value = EmitARCLoadWeak(LV.getAddress(*this));
        }

      // Otherwise we want to do a simple load, suppressing the
      // final autorelease.
      } else {
        value = EmitLoadOfLValue(LV, SourceLocation()).getScalarVal();
        AutoreleaseResult = false;
      }

      value = Builder.CreateBitCast(
          value, ConvertType(GetterMethodDecl->getReturnType()));
    }

    EmitReturnOfRValue(RValue::get(value), propType);
    return;
  }
  }
  llvm_unreachable("bad evaluation kind")__builtin_unreachable();
}

}
llvm_unreachable("bad @property implementation strategy!")__builtin_unreachable();
1286}

1288/// emitStructSetterCall - Call the runtime function to store the value
1289/// from the first formal parameter into the given ivar.
1290static void emitStructSetterCall(CodeGenFunction &CGF, ObjCMethodDecl *OMD,
                               ObjCIvarDecl *ivar) {
// objc_copyStruct (&structIvar, &Arg,
//                  sizeof (struct something), true, false);
CallArgList args;

// The first argument is the address of the ivar.
llvm::Value *ivarAddr =
    CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(), ivar, 0)
        .getPointer(CGF);
ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);

// The second argument is the address of the parameter variable.
ParmVarDecl *argVar = *OMD->param_begin();
DeclRefExpr argRef(CGF.getContext(), argVar, false,
                   argVar->getType().getNonReferenceType(), VK_LValue,
                   SourceLocation());
llvm::Value *argAddr = CGF.EmitLValue(&argRef).getPointer(CGF);
argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);

// The third argument is the sizeof the type.
llvm::Value *size =
  CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(ivar->getType()));
args.add(RValue::get(size), CGF.getContext().getSizeType());

// The fourth argument is the 'isAtomic' flag.
args.add(RValue::get(CGF.Builder.getTrue()), CGF.getContext().BoolTy);

// The fifth argument is the 'hasStrong' flag.
// FIXME: should this really always be false?
args.add(RValue::get(CGF.Builder.getFalse()), CGF.getContext().BoolTy);

llvm::FunctionCallee fn = CGF.CGM.getObjCRuntime().GetSetStructFunction();
CGCallee callee = CGCallee::forDirect(fn);
CGF.EmitCall(
    CGF.getTypes().arrangeBuiltinFunctionCall(CGF.getContext().VoidTy, args),
             callee, ReturnValueSlot(), args);
1329}

1331/// emitCPPObjectAtomicSetterCall - Call the runtime function to store
1332/// the value from the first formal parameter into the given ivar, using
1333/// the Cpp API for atomic Cpp objects with non-trivial copy assignment.
1334static void emitCPPObjectAtomicSetterCall(CodeGenFunction &CGF,
                                        ObjCMethodDecl *OMD,
                                        ObjCIvarDecl *ivar,
                                        llvm::Constant *AtomicHelperFn) {
// objc_copyCppObjectAtomic (&CppObjectIvar, &Arg,
//                           AtomicHelperFn);
CallArgList args;

// The first argument is the address of the ivar.
llvm::Value *ivarAddr =
    CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(), ivar, 0)
        .getPointer(CGF);
ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);

// The second argument is the address of the parameter variable.
ParmVarDecl *argVar = *OMD->param_begin();
DeclRefExpr argRef(CGF.getContext(), argVar, false,
                   argVar->getType().getNonReferenceType(), VK_LValue,
                   SourceLocation());
llvm::Value *argAddr = CGF.EmitLValue(&argRef).getPointer(CGF);
argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);

// Third argument is the helper function.
args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);

llvm::FunctionCallee fn =
    CGF.CGM.getObjCRuntime().GetCppAtomicObjectSetFunction();
CGCallee callee = CGCallee::forDirect(fn);
CGF.EmitCall(
    CGF.getTypes().arrangeBuiltinFunctionCall(CGF.getContext().VoidTy, args),
             callee, ReturnValueSlot(), args);
1367}


1370static bool hasTrivialSetExpr(const ObjCPropertyImplDecl *PID) {
Expr *setter = PID->getSetterCXXAssignment();
if (!setter) return true;

// Sema only makes only of these when the ivar has a C++ class type,
// so the form is pretty constrained.

// An operator call is trivial if the function it calls is trivial.
// This also implies that there's nothing non-trivial going on with
// the arguments, because operator= can only be trivial if it's a
// synthesized assignment operator and therefore both parameters are
// references.
if (CallExpr *call = dyn_cast<CallExpr>(setter)) {
  if (const FunctionDecl *callee
        = dyn_cast_or_null<FunctionDecl>(call->getCalleeDecl()))
    if (callee->isTrivial())
      return true;
  return false;
}

assert(isa<ExprWithCleanups>(setter))((void)0);
return false;
1392}

1394static bool UseOptimizedSetter(CodeGenModule &CGM) {
if (CGM.getLangOpts().getGC() != LangOptions::NonGC)
  return false;
return CGM.getLangOpts().ObjCRuntime.hasOptimizedSetter();
1398}

1400void
1401CodeGenFunction::generateObjCSetterBody(const ObjCImplementationDecl *classImpl,
                                      const ObjCPropertyImplDecl *propImpl,
                                      llvm::Constant *AtomicHelperFn) {
ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
ObjCMethodDecl *setterMethod = propImpl->getSetterMethodDecl();

// Just use the setter expression if Sema gave us one and it's
// non-trivial.
if (!hasTrivialSetExpr(propImpl)) {
  if (!AtomicHelperFn)
    // If non-atomic, assignment is called directly.
    EmitStmt(propImpl->getSetterCXXAssignment());
  else
    // If atomic, assignment is called via a locking api.
    emitCPPObjectAtomicSetterCall(*this, setterMethod, ivar,
                                  AtomicHelperFn);
  return;
}

PropertyImplStrategy strategy(CGM, propImpl);
switch (strategy.getKind()) {
case PropertyImplStrategy::Native: {
  // We don't need to do anything for a zero-size struct.
  if (strategy.getIvarSize().isZero())
    return;

  Address argAddr = GetAddrOfLocalVar(*setterMethod->param_begin());

  LValue ivarLValue =
    EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, /*quals*/ 0);
  Address ivarAddr = ivarLValue.getAddress(*this);

  // Currently, all atomic accesses have to be through integer
  // types, so there's no point in trying to pick a prettier type.
  llvm::Type *bitcastType =
    llvm::Type::getIntNTy(getLLVMContext(),
                          getContext().toBits(strategy.getIvarSize()));

  // Cast both arguments to the chosen operation type.
  argAddr = Builder.CreateElementBitCast(argAddr, bitcastType);
  ivarAddr = Builder.CreateElementBitCast(ivarAddr, bitcastType);

  // This bitcast load is likely to cause some nasty IR.
  llvm::Value *load = Builder.CreateLoad(argAddr);

  // Perform an atomic store.  There are no memory ordering requirements.
  llvm::StoreInst *store = Builder.CreateStore(load, ivarAddr);
  store->setAtomic(llvm::AtomicOrdering::Unordered);
  return;
}

case PropertyImplStrategy::GetSetProperty:
case PropertyImplStrategy::SetPropertyAndExpressionGet: {

  llvm::FunctionCallee setOptimizedPropertyFn = nullptr;
  llvm::FunctionCallee setPropertyFn = nullptr;
  if (UseOptimizedSetter(CGM)) {
    // 10.8 and iOS 6.0 code and GC is off
    setOptimizedPropertyFn =
        CGM.getObjCRuntime().GetOptimizedPropertySetFunction(
            strategy.isAtomic(), strategy.isCopy());
    if (!setOptimizedPropertyFn) {
      CGM.ErrorUnsupported(propImpl, "Obj-C optimized setter - NYI");
      return;
    }
  }
  else {
    setPropertyFn = CGM.getObjCRuntime().GetPropertySetFunction();
    if (!setPropertyFn) {
      CGM.ErrorUnsupported(propImpl, "Obj-C setter requiring atomic copy");
      return;
    }
  }

  // Emit objc_setProperty((id) self, _cmd, offset, arg,
  //                       <is-atomic>, <is-copy>).
  llvm::Value *cmd =
    Builder.CreateLoad(GetAddrOfLocalVar(setterMethod->getCmdDecl()));
  llvm::Value *self =
    Builder.CreateBitCast(LoadObjCSelf(), VoidPtrTy);
  llvm::Value *ivarOffset =
    EmitIvarOffset(classImpl->getClassInterface(), ivar);
  Address argAddr = GetAddrOfLocalVar(*setterMethod->param_begin());
  llvm::Value *arg = Builder.CreateLoad(argAddr, "arg");
  arg = Builder.CreateBitCast(arg, VoidPtrTy);

  CallArgList args;
  args.add(RValue::get(self), getContext().getObjCIdType());
  args.add(RValue::get(cmd), getContext().getObjCSelType());
  if (setOptimizedPropertyFn) {
    args.add(RValue::get(arg), getContext().getObjCIdType());
    args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
    CGCallee callee = CGCallee::forDirect(setOptimizedPropertyFn);
    EmitCall(getTypes().arrangeBuiltinFunctionCall(getContext().VoidTy, args),
             callee, ReturnValueSlot(), args);
  } else {
    args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
    args.add(RValue::get(arg), getContext().getObjCIdType());
    args.add(RValue::get(Builder.getInt1(strategy.isAtomic())),
             getContext().BoolTy);
    args.add(RValue::get(Builder.getInt1(strategy.isCopy())),
             getContext().BoolTy);
    // FIXME: We shouldn't need to get the function info here, the runtime
    // already should have computed it to build the function.
    CGCallee callee = CGCallee::forDirect(setPropertyFn);
    EmitCall(getTypes().arrangeBuiltinFunctionCall(getContext().VoidTy, args),
             callee, ReturnValueSlot(), args);
  }

  return;
}

case PropertyImplStrategy::CopyStruct:
  emitStructSetterCall(*this, setterMethod, ivar);
  return;

case PropertyImplStrategy::Expression:
  break;
}

// Otherwise, fake up some ASTs and emit a normal assignment.
ValueDecl *selfDecl = setterMethod->getSelfDecl();
DeclRefExpr self(getContext(), selfDecl, false, selfDecl->getType(),
                 VK_LValue, SourceLocation());
ImplicitCastExpr selfLoad(ImplicitCastExpr::OnStack, selfDecl->getType(),
                          CK_LValueToRValue, &self, VK_PRValue,
                          FPOptionsOverride());
ObjCIvarRefExpr ivarRef(ivar, ivar->getType().getNonReferenceType(),
                        SourceLocation(), SourceLocation(),
                        &selfLoad, true, true);

ParmVarDecl *argDecl = *setterMethod->param_begin();
QualType argType = argDecl->getType().getNonReferenceType();
DeclRefExpr arg(getContext(), argDecl, false, argType, VK_LValue,
                SourceLocation());
ImplicitCastExpr argLoad(ImplicitCastExpr::OnStack,
                         argType.getUnqualifiedType(), CK_LValueToRValue,
                         &arg, VK_PRValue, FPOptionsOverride());

// The property type can differ from the ivar type in some situations with
// Objective-C pointer types, we can always bit cast the RHS in these cases.
// The following absurdity is just to ensure well-formed IR.
CastKind argCK = CK_NoOp;
if (ivarRef.getType()->isObjCObjectPointerType()) {
  if (argLoad.getType()->isObjCObjectPointerType())
    argCK = CK_BitCast;
  else if (argLoad.getType()->isBlockPointerType())
    argCK = CK_BlockPointerToObjCPointerCast;
  else
    argCK = CK_CPointerToObjCPointerCast;
} else if (ivarRef.getType()->isBlockPointerType()) {
   if (argLoad.getType()->isBlockPointerType())
    argCK = CK_BitCast;
  else
    argCK = CK_AnyPointerToBlockPointerCast;
} else if (ivarRef.getType()->isPointerType()) {
  argCK = CK_BitCast;
}
ImplicitCastExpr argCast(ImplicitCastExpr::OnStack, ivarRef.getType(), argCK,
                         &argLoad, VK_PRValue, FPOptionsOverride());
Expr *finalArg = &argLoad;
if (!getContext().hasSameUnqualifiedType(ivarRef.getType(),
                                         argLoad.getType()))
  finalArg = &argCast;

BinaryOperator *assign = BinaryOperator::Create(
    getContext(), &ivarRef, finalArg, BO_Assign, ivarRef.getType(),
    VK_PRValue, OK_Ordinary, SourceLocation(), FPOptionsOverride());
EmitStmt(assign);
1570}

1572/// Generate an Objective-C property setter function.
1573///
1574/// The given Decl must be an ObjCImplementationDecl. \@synthesize
1575/// is illegal within a category.
1576void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP,
                                       const ObjCPropertyImplDecl *PID) {
llvm::Constant *AtomicHelperFn =
    CodeGenFunction(CGM).GenerateObjCAtomicSetterCopyHelperFunction(PID);
ObjCMethodDecl *OMD = PID->getSetterMethodDecl();
assert(OMD && "Invalid call to generate setter (empty method)")((void)0);
StartObjCMethod(OMD, IMP->getClassInterface());

generateObjCSetterBody(IMP, PID, AtomicHelperFn);

FinishFunction(OMD->getEndLoc());
1587}

1589namespace {
struct DestroyIvar final : EHScopeStack::Cleanup {
private:
  llvm::Value *addr;
  const ObjCIvarDecl *ivar;
  CodeGenFunction::Destroyer *destroyer;
  bool useEHCleanupForArray;
public:
  DestroyIvar(llvm::Value *addr, const ObjCIvarDecl *ivar,
              CodeGenFunction::Destroyer *destroyer,
              bool useEHCleanupForArray)
    : addr(addr), ivar(ivar), destroyer(destroyer),
      useEHCleanupForArray(useEHCleanupForArray) {}

  void Emit(CodeGenFunction &CGF, Flags flags) override {
    LValue lvalue
      = CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), addr, ivar, /*CVR*/ 0);
    CGF.emitDestroy(lvalue.getAddress(CGF), ivar->getType(), destroyer,
                    flags.isForNormalCleanup() && useEHCleanupForArray);
  }
};
1610}

1612/// Like CodeGenFunction::destroyARCStrong, but do it with a call.
1613static void destroyARCStrongWithStore(CodeGenFunction &CGF,
                                    Address addr,
                                    QualType type) {
llvm::Value *null = getNullForVariable(addr);
CGF.EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
1618}

1620static void emitCXXDestructMethod(CodeGenFunction &CGF,
                                ObjCImplementationDecl *impl) {
CodeGenFunction::RunCleanupsScope scope(CGF);

llvm::Value *self = CGF.LoadObjCSelf();

const ObjCInterfaceDecl *iface = impl->getClassInterface();
for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
     ivar; ivar = ivar->getNextIvar()) {
  QualType type = ivar->getType();

  // Check whether the ivar is a destructible type.
  QualType::DestructionKind dtorKind = type.isDestructedType();
  if (!dtorKind) continue;

  CodeGenFunction::Destroyer *destroyer = nullptr;

  // Use a call to objc_storeStrong to destroy strong ivars, for the
  // general benefit of the tools.
  if (dtorKind == QualType::DK_objc_strong_lifetime) {
    destroyer = destroyARCStrongWithStore;

  // Otherwise use the default for the destruction kind.
  } else {
    destroyer = CGF.getDestroyer(dtorKind);
  }

  CleanupKind cleanupKind = CGF.getCleanupKind(dtorKind);

  CGF.EHStack.pushCleanup<DestroyIvar>(cleanupKind, self, ivar, destroyer,
                                       cleanupKind & EHCleanup);
}

assert(scope.requiresCleanups() && "nothing to do in .cxx_destruct?")((void)0);
1654}

1656void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP,
                                               ObjCMethodDecl *MD,
                                               bool ctor) {
MD->createImplicitParams(CGM.getContext(), IMP->getClassInterface());
StartObjCMethod(MD, IMP->getClassInterface());

// Emit .cxx_construct.
if (ctor) {
  // Suppress the final autorelease in ARC.
  AutoreleaseResult = false;

  for (const auto *IvarInit : IMP->inits()) {
    FieldDecl *Field = IvarInit->getAnyMember();
    ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field);
    LValue LV = EmitLValueForIvar(TypeOfSelfObject(),
                                  LoadObjCSelf(), Ivar, 0);
    EmitAggExpr(IvarInit->getInit(),
                AggValueSlot::forLValue(LV, *this, AggValueSlot::IsDestructed,
                                        AggValueSlot::DoesNotNeedGCBarriers,
                                        AggValueSlot::IsNotAliased,
                                        AggValueSlot::DoesNotOverlap));
  }
  // constructor returns 'self'.
  CodeGenTypes &Types = CGM.getTypes();
  QualType IdTy(CGM.getContext().getObjCIdType());
  llvm::Value *SelfAsId =
    Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy));
  EmitReturnOfRValue(RValue::get(SelfAsId), IdTy);

// Emit .cxx_destruct.
} else {
  emitCXXDestructMethod(*this, IMP);
}
FinishFunction();
1690}

1692llvm::Value *CodeGenFunction::LoadObjCSelf() {
VarDecl *Self = cast<ObjCMethodDecl>(CurFuncDecl)->getSelfDecl();
DeclRefExpr DRE(getContext(), Self,
                /*is enclosing local*/ (CurFuncDecl != CurCodeDecl),
                Self->getType(), VK_LValue, SourceLocation());
return EmitLoadOfScalar(EmitDeclRefLValue(&DRE), SourceLocation());
1698}

1700QualType CodeGenFunction::TypeOfSelfObject() {
const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
ImplicitParamDecl *selfDecl = OMD->getSelfDecl();
const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>(
  getContext().getCanonicalType(selfDecl->getType()));
return PTy->getPointeeType();
1706}

1708void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){
llvm::FunctionCallee EnumerationMutationFnPtr =
    CGM.getObjCRuntime().EnumerationMutationFunction();
if (!EnumerationMutationFnPtr) {
  CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime");
  return;
}
CGCallee EnumerationMutationFn =
  CGCallee::forDirect(EnumerationMutationFnPtr);

CGDebugInfo *DI = getDebugInfo();
if (DI)
  DI->EmitLexicalBlockStart(Builder, S.getSourceRange().getBegin());

RunCleanupsScope ForScope(*this);

// The local variable comes into scope immediately.
AutoVarEmission variable = AutoVarEmission::invalid();
if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement()))
  variable = EmitAutoVarAlloca(*cast<VarDecl>(SD->getSingleDecl()));

JumpDest LoopEnd = getJumpDestInCurrentScope("forcoll.end");

// Fast enumeration state.
QualType StateTy = CGM.getObjCFastEnumerationStateType();
Address StatePtr = CreateMemTemp(StateTy, "state.ptr");
EmitNullInitialization(StatePtr, StateTy);

// Number of elements in the items array.
static const unsigned NumItems = 16;

// Fetch the countByEnumeratingWithState:objects:count: selector.
IdentifierInfo *II[] = {
  &CGM.getContext().Idents.get("countByEnumeratingWithState"),
  &CGM.getContext().Idents.get("objects"),
  &CGM.getContext().Idents.get("count")
};
Selector FastEnumSel =
  CGM.getContext().Selectors.getSelector(llvm::array_lengthof(II), &II[0]);

QualType ItemsTy =
  getContext().getConstantArrayType(getContext().getObjCIdType(),
                                    llvm::APInt(32, NumItems), nullptr,
                                    ArrayType::Normal, 0);
Address ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr");

// Emit the collection pointer.  In ARC, we do a retain.
llvm::Value *Collection;
if (getLangOpts().ObjCAutoRefCount) {
  Collection = EmitARCRetainScalarExpr(S.getCollection());

  // Enter a cleanup to do the release.
  EmitObjCConsumeObject(S.getCollection()->getType(), Collection);
} else {
  Collection = EmitScalarExpr(S.getCollection());
}

// The 'continue' label needs to appear within the cleanup for the
// collection object.
JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next");

// Send it our message:
CallArgList Args;

// The first argument is a temporary of the enumeration-state type.
Args.add(RValue::get(StatePtr.getPointer()),
         getContext().getPointerType(StateTy));

// The second argument is a temporary array with space for NumItems
// pointers.  We'll actually be loading elements from the array
// pointer written into the control state; this buffer is so that
// collections that *aren't* backed by arrays can still queue up
// batches of elements.
Args.add(RValue::get(ItemsPtr.getPointer()),
         getContext().getPointerType(ItemsTy));

// The third argument is the capacity of that temporary array.
llvm::Type *NSUIntegerTy = ConvertType(getContext().getNSUIntegerType());
llvm::Constant *Count = llvm::ConstantInt::get(NSUIntegerTy, NumItems);
Args.add(RValue::get(Count), getContext().getNSUIntegerType());

// Start the enumeration.
RValue CountRV =
    CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
                                             getContext().getNSUIntegerType(),
                                             FastEnumSel, Collection, Args);

// The initial number of objects that were returned in the buffer.
llvm::Value *initialBufferLimit = CountRV.getScalarVal();

llvm::BasicBlock *EmptyBB = createBasicBlock("forcoll.empty");
llvm::BasicBlock *LoopInitBB = createBasicBlock("forcoll.loopinit");

llvm::Value *zero = llvm::Constant::getNullValue(NSUIntegerTy);

// If the limit pointer was zero to begin with, the collection is
// empty; skip all this. Set the branch weight assuming this has the same
// probability of exiting the loop as any other loop exit.
uint64_t EntryCount = getCurrentProfileCount();
Builder.CreateCondBr(
    Builder.CreateICmpEQ(initialBufferLimit, zero, "iszero"), EmptyBB,
    LoopInitBB,
    createProfileWeights(EntryCount, getProfileCount(S.getBody())));

// Otherwise, initialize the loop.
EmitBlock(LoopInitBB);

// Save the initial mutations value.  This is the value at an
// address that was written into the state object by
// countByEnumeratingWithState:objects:count:.
Address StateMutationsPtrPtr =
    Builder.CreateStructGEP(StatePtr, 2, "mutationsptr.ptr");
llvm::Value *StateMutationsPtr
  = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr");

llvm::Type *UnsignedLongTy = ConvertType(getContext().UnsignedLongTy);
llvm::Value *initialMutations =
  Builder.CreateAlignedLoad(UnsignedLongTy, StateMutationsPtr,
                            getPointerAlign(), "forcoll.initial-mutations");

// Start looping.  This is the point we return to whenever we have a
// fresh, non-empty batch of objects.
llvm::BasicBlock *LoopBodyBB = createBasicBlock("forcoll.loopbody");
EmitBlock(LoopBodyBB);

// The current index into the buffer.
llvm::PHINode *index = Builder.CreatePHI(NSUIntegerTy, 3, "forcoll.index");
index->addIncoming(zero, LoopInitBB);

// The current buffer size.
llvm::PHINode *count = Builder.CreatePHI(NSUIntegerTy, 3, "forcoll.count");
count->addIncoming(initialBufferLimit, LoopInitBB);

incrementProfileCounter(&S);

// Check whether the mutations value has changed from where it was
// at start.  StateMutationsPtr should actually be invariant between
// refreshes.
StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr");
llvm::Value *currentMutations
  = Builder.CreateAlignedLoad(UnsignedLongTy, StateMutationsPtr,
                              getPointerAlign(), "statemutations");

llvm::BasicBlock *WasMutatedBB = createBasicBlock("forcoll.mutated");
llvm::BasicBlock *WasNotMutatedBB = createBasicBlock("forcoll.notmutated");

Builder.CreateCondBr(Builder.CreateICmpEQ(currentMutations, initialMutations),
                     WasNotMutatedBB, WasMutatedBB);

// If so, call the enumeration-mutation function.
EmitBlock(WasMutatedBB);
llvm::Type *ObjCIdType = ConvertType(getContext().getObjCIdType());
llvm::Value *V =
  Builder.CreateBitCast(Collection, ObjCIdType);
CallArgList Args2;
Args2.add(RValue::get(V), getContext().getObjCIdType());
// FIXME: We shouldn't need to get the function info here, the runtime already
// should have computed it to build the function.
EmitCall(
        CGM.getTypes().arrangeBuiltinFunctionCall(getContext().VoidTy, Args2),
         EnumerationMutationFn, ReturnValueSlot(), Args2);

// Otherwise, or if the mutation function returns, just continue.
EmitBlock(WasNotMutatedBB);

// Initialize the element variable.
RunCleanupsScope elementVariableScope(*this);
bool elementIsVariable;
LValue elementLValue;
QualType elementType;
if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) {
  // Initialize the variable, in case it's a __block variable or something.
  EmitAutoVarInit(variable);

  const VarDecl *D = cast<VarDecl>(SD->getSingleDecl());
  DeclRefExpr tempDRE(getContext(), const_cast<VarDecl *>(D), false,
                      D->getType(), VK_LValue, SourceLocation());
  elementLValue = EmitLValue(&tempDRE);
  elementType = D->getType();
  elementIsVariable = true;

  if (D->isARCPseudoStrong())
    elementLValue.getQuals().setObjCLifetime(Qualifiers::OCL_ExplicitNone);
} else {
  elementLValue = LValue(); // suppress warning
  elementType = cast<Expr>(S.getElement())->getType();
  elementIsVariable = false;
}
llvm::Type *convertedElementType = ConvertType(elementType);

// Fetch the buffer out of the enumeration state.
// TODO: this pointer should actually be invariant between
// refreshes, which would help us do certain loop optimizations.
Address StateItemsPtr =
    Builder.CreateStructGEP(StatePtr, 1, "stateitems.ptr");
llvm::Value *EnumStateItems =
  Builder.CreateLoad(StateItemsPtr, "stateitems");

// Fetch the value at the current index from the buffer.
llvm::Value *CurrentItemPtr = Builder.CreateGEP(
    EnumStateItems->getType()->getPointerElementType(), EnumStateItems, index,
    "currentitem.ptr");
llvm::Value *CurrentItem =
  Builder.CreateAlignedLoad(ObjCIdType, CurrentItemPtr, getPointerAlign());

if (SanOpts.has(SanitizerKind::ObjCCast)) {
  // Before using an item from the collection, check that the implicit cast
  // from id to the element type is valid. This is done with instrumentation
  // roughly corresponding to:
  //
  //   if (![item isKindOfClass:expectedCls]) { /* emit diagnostic */ }
  const ObjCObjectPointerType *ObjPtrTy =
      elementType->getAsObjCInterfacePointerType();
  const ObjCInterfaceType *InterfaceTy =
      ObjPtrTy ? ObjPtrTy->getInterfaceType() : nullptr;
  if (InterfaceTy) {
    SanitizerScope SanScope(this);
    auto &C = CGM.getContext();
    assert(InterfaceTy->getDecl() && "No decl for ObjC interface type")((void)0);
    Selector IsKindOfClassSel = GetUnarySelector("isKindOfClass", C);
    CallArgList IsKindOfClassArgs;
    llvm::Value *Cls =
        CGM.getObjCRuntime().GetClass(*this, InterfaceTy->getDecl());
    IsKindOfClassArgs.add(RValue::get(Cls), C.getObjCClassType());
    llvm::Value *IsClass =
        CGM.getObjCRuntime()
            .GenerateMessageSend(*this, ReturnValueSlot(), C.BoolTy,
                                 IsKindOfClassSel, CurrentItem,
                                 IsKindOfClassArgs)
            .getScalarVal();
    llvm::Constant *StaticData[] = {
        EmitCheckSourceLocation(S.getBeginLoc()),
        EmitCheckTypeDescriptor(QualType(InterfaceTy, 0))};
    EmitCheck({{IsClass, SanitizerKind::ObjCCast}},
              SanitizerHandler::InvalidObjCCast,
              ArrayRef<llvm::Constant *>(StaticData), CurrentItem);
  }
}

// Cast that value to the right type.
CurrentItem = Builder.CreateBitCast(CurrentItem, convertedElementType,
                                    "currentitem");

// Make sure we have an l-value.  Yes, this gets evaluated every
// time through the loop.
if (!elementIsVariable) {
  elementLValue = EmitLValue(cast<Expr>(S.getElement()));
  EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue);
} else {
  EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue,
                         /*isInit*/ true);
}

// If we do have an element variable, this assignment is the end of
// its initialization.
if (elementIsVariable)
  EmitAutoVarCleanups(variable);

// Perform the loop body, setting up break and continue labels.
BreakContinueStack.push_back(BreakContinue(LoopEnd, AfterBody));
{
  RunCleanupsScope Scope(*this);
  EmitStmt(S.getBody());
}
BreakContinueStack.pop_back();

// Destroy the element variable now.
elementVariableScope.ForceCleanup();

// Check whether there are more elements.
EmitBlock(AfterBody.getBlock());

llvm::BasicBlock *FetchMoreBB = createBasicBlock("forcoll.refetch");

// First we check in the local buffer.
llvm::Value *indexPlusOne =
    Builder.CreateAdd(index, llvm::ConstantInt::get(NSUIntegerTy, 1));

// If we haven't overrun the buffer yet, we can continue.
// Set the branch weights based on the simplifying assumption that this is
// like a while-loop, i.e., ignoring that the false branch fetches more
// elements and then returns to the loop.
Builder.CreateCondBr(
    Builder.CreateICmpULT(indexPlusOne, count), LoopBodyBB, FetchMoreBB,
    createProfileWeights(getProfileCount(S.getBody()), EntryCount));

index->addIncoming(indexPlusOne, AfterBody.getBlock());
count->addIncoming(count, AfterBody.getBlock());

// Otherwise, we have to fetch more elements.
EmitBlock(FetchMoreBB);

CountRV =
    CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
                                             getContext().getNSUIntegerType(),
                                             FastEnumSel, Collection, Args);

// If we got a zero count, we're done.
llvm::Value *refetchCount = CountRV.getScalarVal();

// (note that the message send might split FetchMoreBB)
index->addIncoming(zero, Builder.GetInsertBlock());
count->addIncoming(refetchCount, Builder.GetInsertBlock());

Builder.CreateCondBr(Builder.CreateICmpEQ(refetchCount, zero),
                     EmptyBB, LoopBodyBB);

// No more elements.
EmitBlock(EmptyBB);

if (!elementIsVariable) {
  // If the element was not a declaration, set it to be null.

  llvm::Value *null = llvm::Constant::getNullValue(convertedElementType);
  elementLValue = EmitLValue(cast<Expr>(S.getElement()));
  EmitStoreThroughLValue(RValue::get(null), elementLValue);
}

if (DI)
  DI->EmitLexicalBlockEnd(Builder, S.getSourceRange().getEnd());

ForScope.ForceCleanup();
EmitBlock(LoopEnd.getBlock());
2031}

2033void CodeGenFunction::EmitObjCAtTryStmt(const ObjCAtTryStmt &S) {
CGM.getObjCRuntime().EmitTryStmt(*this, S);
2035}

2037void CodeGenFunction::EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S) {
CGM.getObjCRuntime().EmitThrowStmt(*this, S);
2039}

2041void CodeGenFunction::EmitObjCAtSynchronizedStmt(
                                            const ObjCAtSynchronizedStmt &S) {
CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S);
2044}

2046namespace {
struct CallObjCRelease final : EHScopeStack::Cleanup {
  CallObjCRelease(llvm::Value *object) : object(object) {}
  llvm::Value *object;

  void Emit(CodeGenFunction &CGF, Flags flags) override {
    // Releases at the end of the full-expression are imprecise.
    CGF.EmitARCRelease(object, ARCImpreciseLifetime);
  }
};
2056}

2058/// Produce the code for a CK_ARCConsumeObject.  Does a primitive
2059/// release at the end of the full-expression.
2060llvm::Value *CodeGenFunction::EmitObjCConsumeObject(QualType type,
                                                  llvm::Value *object) {
// If we're in a conditional branch, we need to make the cleanup
// conditional.
pushFullExprCleanup<CallObjCRelease>(getARCCleanupKind(), object);
return object;
2066}

2068llvm::Value *CodeGenFunction::EmitObjCExtendObjectLifetime(QualType type,
                                                         llvm::Value *value) {
return EmitARCRetainAutorelease(type, value);
2071}

2073/// Given a number of pointers, inform the optimizer that they're
2074/// being intrinsically used up until this point in the program.
2075void CodeGenFunction::EmitARCIntrinsicUse(ArrayRef<llvm::Value*> values) {
llvm::Function *&fn = CGM.getObjCEntrypoints().clang_arc_use;
if (!fn)
  fn = CGM.getIntrinsic(llvm::Intrinsic::objc_clang_arc_use);

// This isn't really a "runtime" function, but as an intrinsic it
// doesn't really matter as long as we align things up.
EmitNounwindRuntimeCall(fn, values);
2083}

2085/// Emit a call to "clang.arc.noop.use", which consumes the result of a call
2086/// that has operand bundle "clang.arc.attachedcall".
2087void CodeGenFunction::EmitARCNoopIntrinsicUse(ArrayRef<llvm::Value *> values) {
llvm::Function *&fn = CGM.getObjCEntrypoints().clang_arc_noop_use;
if (!fn)
  fn = CGM.getIntrinsic(llvm::Intrinsic::objc_clang_arc_noop_use);
EmitNounwindRuntimeCall(fn, values);
2092}

2094static void setARCRuntimeFunctionLinkage(CodeGenModule &CGM, llvm::Value *RTF) {
if (auto *F = dyn_cast<llvm::Function>(RTF)) {
  // If the target runtime doesn't naturally support ARC, emit weak
  // references to the runtime support library.  We don't really
  // permit this to fail, but we need a particular relocation style.
  if (!CGM.getLangOpts().ObjCRuntime.hasNativeARC() &&
      !CGM.getTriple().isOSBinFormatCOFF()) {
    F->setLinkage(llvm::Function::ExternalWeakLinkage);
  }
}
2104}

2106static void setARCRuntimeFunctionLinkage(CodeGenModule &CGM,
                                       llvm::FunctionCallee RTF) {
setARCRuntimeFunctionLinkage(CGM, RTF.getCallee());
2109}

2111/// Perform an operation having the signature
2112///   i8* (i8*)
2113/// where a null input causes a no-op and returns null.
2114static llvm::Value *emitARCValueOperation(
  CodeGenFunction &CGF, llvm::Value *value, llvm::Type *returnType,
  llvm::Function *&fn, llvm::Intrinsic::ID IntID,
  llvm::CallInst::TailCallKind tailKind = llvm::CallInst::TCK_None) {
if (isa<llvm::ConstantPointerNull>(value))
  return value;

if (!fn) {
  fn = CGF.CGM.getIntrinsic(IntID);
  setARCRuntimeFunctionLinkage(CGF.CGM, fn);
}

// Cast the argument to 'id'.
llvm::Type *origType = returnType ? returnType : value->getType();
value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);

// Call the function.
llvm::CallInst *call = CGF.EmitNounwindRuntimeCall(fn, value);
call->setTailCallKind(tailKind);

// Cast the result back to the original type.
return CGF.Builder.CreateBitCast(call, origType);
2136}

2138/// Perform an operation having the following signature:
2139///   i8* (i8**)
2140static llvm::Value *emitARCLoadOperation(CodeGenFunction &CGF, Address addr,
                                       llvm::Function *&fn,
                                       llvm::Intrinsic::ID IntID) {
if (!fn) {
  fn = CGF.CGM.getIntrinsic(IntID);
  setARCRuntimeFunctionLinkage(CGF.CGM, fn);
}

// Cast the argument to 'id*'.
llvm::Type *origType = addr.getElementType();
addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);

// Call the function.
llvm::Value *result = CGF.EmitNounwindRuntimeCall(fn, addr.getPointer());

// Cast the result back to a dereference of the original type.
if (origType != CGF.Int8PtrTy)
  result = CGF.Builder.CreateBitCast(result, origType);

return result;
2160}

2162/// Perform an operation having the following signature:
2163///   i8* (i8**, i8*)
2164static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF, Address addr,
                                        llvm::Value *value,
                                        llvm::Function *&fn,
                                        llvm::Intrinsic::ID IntID,
                                        bool ignored) {
assert(addr.getElementType() == value->getType())((void)0);

if (!fn) {
  fn = CGF.CGM.getIntrinsic(IntID);
  setARCRuntimeFunctionLinkage(CGF.CGM, fn);
}

llvm::Type *origType = value->getType();

llvm::Value *args[] = {
  CGF.Builder.CreateBitCast(addr.getPointer(), CGF.Int8PtrPtrTy),
  CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy)
};
llvm::CallInst *result = CGF.EmitNounwindRuntimeCall(fn, args);

if (ignored) return nullptr;

return CGF.Builder.CreateBitCast(result, origType);
2187}

2189/// Perform an operation having the following signature:
2190///   void (i8**, i8**)
2191static void emitARCCopyOperation(CodeGenFunction &CGF, Address dst, Address src,
                               llvm::Function *&fn,
                               llvm::Intrinsic::ID IntID) {
assert(dst.getType() == src.getType())((void)0);

if (!fn) {
  fn = CGF.CGM.getIntrinsic(IntID);
  setARCRuntimeFunctionLinkage(CGF.CGM, fn);
}

llvm::Value *args[] = {
  CGF.Builder.CreateBitCast(dst.getPointer(), CGF.Int8PtrPtrTy),
  CGF.Builder.CreateBitCast(src.getPointer(), CGF.Int8PtrPtrTy)
};
CGF.EmitNounwindRuntimeCall(fn, args);
2206}

2208/// Perform an operation having the signature
2209///   i8* (i8*)
2210/// where a null input causes a no-op and returns null.
2211static llvm::Value *emitObjCValueOperation(CodeGenFunction &CGF,
                                         llvm::Value *value,
                                         llvm::Type *returnType,
                                         llvm::FunctionCallee &fn,
                                         StringRef fnName) {
if (isa<llvm::ConstantPointerNull>(value))
  return value;

if (!fn) {
  llvm::FunctionType *fnType =
    llvm::FunctionType::get(CGF.Int8PtrTy, CGF.Int8PtrTy, false);
  fn = CGF.CGM.CreateRuntimeFunction(fnType, fnName);

  // We have Native ARC, so set nonlazybind attribute for performance
  if (llvm::Function *f = dyn_cast<llvm::Function>(fn.getCallee()))
    if (fnName == "objc_retain")
      f->addFnAttr(llvm::Attribute::NonLazyBind);
}

// Cast the argument to 'id'.
llvm::Type *origType = returnType ? returnType : value->getType();
value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);

// Call the function.
llvm::CallBase *Inst = CGF.EmitCallOrInvoke(fn, value);

// Mark calls to objc_autorelease as tail on the assumption that methods
// overriding autorelease do not touch anything on the stack.
if (fnName == "objc_autorelease")
  if (auto *Call = dyn_cast<llvm::CallInst>(Inst))
    Call->setTailCall();

// Cast the result back to the original type.
return CGF.Builder.CreateBitCast(Inst, origType);
2245}

2247/// Produce the code to do a retain.  Based on the type, calls one of:
2248///   call i8* \@objc_retain(i8* %value)
2249///   call i8* \@objc_retainBlock(i8* %value)
2250llvm::Value *CodeGenFunction::EmitARCRetain(QualType type, llvm::Value *value) {
if (type->isBlockPointerType())
  return EmitARCRetainBlock(value, /*mandatory*/ false);
else
  return EmitARCRetainNonBlock(value);
2255}

2257/// Retain the given object, with normal retain semantics.
2258///   call i8* \@objc_retain(i8* %value)
2259llvm::Value *CodeGenFunction::EmitARCRetainNonBlock(llvm::Value *value) {
return emitARCValueOperation(*this, value, nullptr,
                             CGM.getObjCEntrypoints().objc_retain,
                             llvm::Intrinsic::objc_retain);
2263}

2265/// Retain the given block, with _Block_copy semantics.
2266///   call i8* \@objc_retainBlock(i8* %value)
2267///
2268/// \param mandatory - If false, emit the call with metadata
2269/// indicating that it's okay for the optimizer to eliminate this call
2270/// if it can prove that the block never escapes except down the stack.
2271llvm::Value *CodeGenFunction::EmitARCRetainBlock(llvm::Value *value,
                                               bool mandatory) {
llvm::Value *result
  = emitARCValueOperation(*this, value, nullptr,
                          CGM.getObjCEntrypoints().objc_retainBlock,
                          llvm::Intrinsic::objc_retainBlock);

// If the copy isn't mandatory, add !clang.arc.copy_on_escape to
// tell the optimizer that it doesn't need to do this copy if the
// block doesn't escape, where being passed as an argument doesn't
// count as escaping.
if (!mandatory && isa<llvm::Instruction>(result)) {
  llvm::CallInst *call
    = cast<llvm::CallInst>(result->stripPointerCasts());
  assert(call->getCalledOperand() ==((void)0)
         CGM.getObjCEntrypoints().objc_retainBlock)((void)0);

  call->setMetadata("clang.arc.copy_on_escape",
                    llvm::MDNode::get(Builder.getContext(), None));
}

return result;
2293}

2295static void emitAutoreleasedReturnValueMarker(CodeGenFunction &CGF) {
// Fetch the void(void) inline asm which marks that we're going to
// do something with the autoreleased return value.
llvm::InlineAsm *&marker
  = CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker;
if (!marker) {
  StringRef assembly
    = CGF.CGM.getTargetCodeGenInfo()
         .getARCRetainAutoreleasedReturnValueMarker();

  // If we have an empty assembly string, there's nothing to do.
  if (assembly.empty()) {

  // Otherwise, at -O0, build an inline asm that we're going to call
  // in a moment.
  } else if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) {
    llvm::FunctionType *type =
      llvm::FunctionType::get(CGF.VoidTy, /*variadic*/false);

    marker = llvm::InlineAsm::get(type, assembly, "", /*sideeffects*/ true);

  // If we're at -O1 and above, we don't want to litter the code
  // with this marker yet, so leave a breadcrumb for the ARC
  // optimizer to pick up.
  } else {
    const char *retainRVMarkerKey = llvm::objcarc::getRVMarkerModuleFlagStr();
    if (!CGF.CGM.getModule().getModuleFlag(retainRVMarkerKey)) {
      auto *str = llvm::MDString::get(CGF.getLLVMContext(), assembly);
      CGF.CGM.getModule().addModuleFlag(llvm::Module::Error,
                                        retainRVMarkerKey, str);
    }
  }
}

// Call the marker asm if we made one, which we do only at -O0.
if (marker)
  CGF.Builder.CreateCall(marker, None, CGF.getBundlesForFunclet(marker));
2332}

2334static llvm::Value *emitOptimizedARCReturnCall(llvm::Value *value,
                                             bool IsRetainRV,
                                             CodeGenFunction &CGF) {
emitAutoreleasedReturnValueMarker(CGF);

// Add operand bundle "clang.arc.attachedcall" to the call instead of emitting
// retainRV or claimRV calls in the IR. We currently do this only when the
// optimization level isn't -O0 since global-isel, which is currently run at
// -O0, doesn't know about the operand bundle.

// FIXME: Do this when the target isn't aarch64.
if (CGF.CGM.getCodeGenOpts().OptimizationLevel > 0 &&
    CGF.CGM.getTarget().getTriple().isAArch64()) {
  llvm::Value *bundleArgs[] = {llvm::ConstantInt::get(
      CGF.Int64Ty,
      llvm::objcarc::getAttachedCallOperandBundleEnum(IsRetainRV))};
  llvm::OperandBundleDef OB("clang.arc.attachedcall", bundleArgs);
  auto *oldCall = cast<llvm::CallBase>(value);
  llvm::CallBase *newCall = llvm::CallBase::addOperandBundle(
      oldCall, llvm::LLVMContext::OB_clang_arc_attachedcall, OB, oldCall);
  newCall->copyMetadata(*oldCall);
  oldCall->replaceAllUsesWith(newCall);
  oldCall->eraseFromParent();
  CGF.EmitARCNoopIntrinsicUse(newCall);
  return newCall;
}

bool isNoTail =
    CGF.CGM.getTargetCodeGenInfo().markARCOptimizedReturnCallsAsNoTail();
llvm::CallInst::TailCallKind tailKind =
    isNoTail ? llvm::CallInst::TCK_NoTail : llvm::CallInst::TCK_None;
ObjCEntrypoints &EPs = CGF.CGM.getObjCEntrypoints();
llvm::Function *&EP = IsRetainRV
                          ? EPs.objc_retainAutoreleasedReturnValue
                          : EPs.objc_unsafeClaimAutoreleasedReturnValue;
llvm::Intrinsic::ID IID =
    IsRetainRV ? llvm::Intrinsic::objc_retainAutoreleasedReturnValue
               : llvm::Intrinsic::objc_unsafeClaimAutoreleasedReturnValue;
return emitARCValueOperation(CGF, value, nullptr, EP, IID, tailKind);
2373}

2375/// Retain the given object which is the result of a function call.
2376///   call i8* \@objc_retainAutoreleasedReturnValue(i8* %value)
2377///
2378/// Yes, this function name is one character away from a different
2379/// call with completely different semantics.
2380llvm::Value *
2381CodeGenFunction::EmitARCRetainAutoreleasedReturnValue(llvm::Value *value) {
return emitOptimizedARCReturnCall(value, true, *this);
2383}

2385/// Claim a possibly-autoreleased return value at +0.  This is only
2386/// valid to do in contexts which do not rely on the retain to keep
2387/// the object valid for all of its uses; for example, when
2388/// the value is ignored, or when it is being assigned to an
2389/// __unsafe_unretained variable.
2390///
2391///   call i8* \@objc_unsafeClaimAutoreleasedReturnValue(i8* %value)
2392llvm::Value *
2393CodeGenFunction::EmitARCUnsafeClaimAutoreleasedReturnValue(llvm::Value *value) {
return emitOptimizedARCReturnCall(value, false, *this);
2395}

2397/// Release the given object.
2398///   call void \@objc_release(i8* %value)
2399void CodeGenFunction::EmitARCRelease(llvm::Value *value,
                                   ARCPreciseLifetime_t precise) {
if (isa<llvm::ConstantPointerNull>(value)) return;

llvm::Function *&fn = CGM.getObjCEntrypoints().objc_release;
if (!fn) {
  fn = CGM.getIntrinsic(llvm::Intrinsic::objc_release);
  setARCRuntimeFunctionLinkage(CGM, fn);
}

// Cast the argument to 'id'.
value = Builder.CreateBitCast(value, Int8PtrTy);

// Call objc_release.
llvm::CallInst *call = EmitNounwindRuntimeCall(fn, value);

if (precise == ARCImpreciseLifetime) {
  call->setMetadata("clang.imprecise_release",
                    llvm::MDNode::get(Builder.getContext(), None));
}
2419}

2421/// Destroy a __strong variable.
2422///
2423/// At -O0, emit a call to store 'null' into the address;
2424/// instrumenting tools prefer this because the address is exposed,
2425/// but it's relatively cumbersome to optimize.
2426///
2427/// At -O1 and above, just load and call objc_release.
2428///
2429///   call void \@objc_storeStrong(i8** %addr, i8* null)
2430void CodeGenFunction::EmitARCDestroyStrong(Address addr,
                                         ARCPreciseLifetime_t precise) {
if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
  llvm::Value *null = getNullForVariable(addr);
  EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
  return;
}

llvm::Value *value = Builder.CreateLoad(addr);
EmitARCRelease(value, precise);
2440}

2442/// Store into a strong object.  Always calls this:
2443///   call void \@objc_storeStrong(i8** %addr, i8* %value)
2444llvm::Value *CodeGenFunction::EmitARCStoreStrongCall(Address addr,
                                                   llvm::Value *value,
                                                   bool ignored) {
assert(addr.getElementType() == value->getType())((void)0);

llvm::Function *&fn = CGM.getObjCEntrypoints().objc_storeStrong;
if (!fn) {
  fn = CGM.getIntrinsic(llvm::Intrinsic::objc_storeStrong);
  setARCRuntimeFunctionLinkage(CGM, fn);
}

llvm::Value *args[] = {
  Builder.CreateBitCast(addr.getPointer(), Int8PtrPtrTy),
  Builder.CreateBitCast(value, Int8PtrTy)
};
EmitNounwindRuntimeCall(fn, args);

if (ignored) return nullptr;
return value;
2463}

2465/// Store into a strong object.  Sometimes calls this:
2466///   call void \@objc_storeStrong(i8** %addr, i8* %value)
2467/// Other times, breaks it down into components.
2468llvm::Value *CodeGenFunction::EmitARCStoreStrong(LValue dst,
                                               llvm::Value *newValue,
                                               bool ignored) {
QualType type = dst.getType();
bool isBlock = type->isBlockPointerType();

// Use a store barrier at -O0 unless this is a block type or the
// lvalue is inadequately aligned.
if (shouldUseFusedARCCalls() &&
    !isBlock &&
    (dst.getAlignment().isZero() ||
     dst.getAlignment() >= CharUnits::fromQuantity(PointerAlignInBytes))) {
  return EmitARCStoreStrongCall(dst.getAddress(*this), newValue, ignored);
}

// Otherwise, split it out.

// Retain the new value.
newValue = EmitARCRetain(type, newValue);

// Read the old value.
llvm::Value *oldValue = EmitLoadOfScalar(dst, SourceLocation());

// Store.  We do this before the release so that any deallocs won't
// see the old value.
EmitStoreOfScalar(newValue, dst);

// Finally, release the old value.
EmitARCRelease(oldValue, dst.isARCPreciseLifetime());

return newValue;
2499}

2501/// Autorelease the given object.
2502///   call i8* \@objc_autorelease(i8* %value)
2503llvm::Value *CodeGenFunction::EmitARCAutorelease(llvm::Value *value) {
return emitARCValueOperation(*this, value, nullptr,
                             CGM.getObjCEntrypoints().objc_autorelease,
                             llvm::Intrinsic::objc_autorelease);
2507}

2509/// Autorelease the given object.
2510///   call i8* \@objc_autoreleaseReturnValue(i8* %value)
2511llvm::Value *
2512CodeGenFunction::EmitARCAutoreleaseReturnValue(llvm::Value *value) {
return emitARCValueOperation(*this, value, nullptr,
                          CGM.getObjCEntrypoints().objc_autoreleaseReturnValue,
                             llvm::Intrinsic::objc_autoreleaseReturnValue,
                             llvm::CallInst::TCK_Tail);
2517}

2519/// Do a fused retain/autorelease of the given object.
2520///   call i8* \@objc_retainAutoreleaseReturnValue(i8* %value)
2521llvm::Value *
2522CodeGenFunction::EmitARCRetainAutoreleaseReturnValue(llvm::Value *value) {
return emitARCValueOperation(*this, value, nullptr,
                   CGM.getObjCEntrypoints().objc_retainAutoreleaseReturnValue,
                           llvm::Intrinsic::objc_retainAutoreleaseReturnValue,
                             llvm::CallInst::TCK_Tail);
2527}

2529/// Do a fused retain/autorelease of the given object.
2530///   call i8* \@objc_retainAutorelease(i8* %value)
2531/// or
2532///   %retain = call i8* \@objc_retainBlock(i8* %value)
2533///   call i8* \@objc_autorelease(i8* %retain)
2534llvm::Value *CodeGenFunction::EmitARCRetainAutorelease(QualType type,
                                                     llvm::Value *value) {
if (!type->isBlockPointerType())
  return EmitARCRetainAutoreleaseNonBlock(value);

if (isa<llvm::ConstantPointerNull>(value)) return value;

llvm::Type *origType = value->getType();
value = Builder.CreateBitCast(value, Int8PtrTy);
value = EmitARCRetainBlock(value, /*mandatory*/ true);
value = EmitARCAutorelease(value);
return Builder.CreateBitCast(value, origType);
2546}

2548/// Do a fused retain/autorelease of the given object.
2549///   call i8* \@objc_retainAutorelease(i8* %value)
2550llvm::Value *
2551CodeGenFunction::EmitARCRetainAutoreleaseNonBlock(llvm::Value *value) {
return emitARCValueOperation(*this, value, nullptr,
                             CGM.getObjCEntrypoints().objc_retainAutorelease,
                             llvm::Intrinsic::objc_retainAutorelease);
2555}

2557/// i8* \@objc_loadWeak(i8** %addr)
2558/// Essentially objc_autorelease(objc_loadWeakRetained(addr)).
2559llvm::Value *CodeGenFunction::EmitARCLoadWeak(Address addr) {
return emitARCLoadOperation(*this, addr,
                            CGM.getObjCEntrypoints().objc_loadWeak,
                            llvm::Intrinsic::objc_loadWeak);
2563}

2565/// i8* \@objc_loadWeakRetained(i8** %addr)
2566llvm::Value *CodeGenFunction::EmitARCLoadWeakRetained(Address addr) {
return emitARCLoadOperation(*this, addr,
                            CGM.getObjCEntrypoints().objc_loadWeakRetained,
                            llvm::Intrinsic::objc_loadWeakRetained);
2570}

2572/// i8* \@objc_storeWeak(i8** %addr, i8* %value)
2573/// Returns %value.
2574llvm::Value *CodeGenFunction::EmitARCStoreWeak(Address addr,
                                             llvm::Value *value,
                                             bool ignored) {
return emitARCStoreOperation(*this, addr, value,
                             CGM.getObjCEntrypoints().objc_storeWeak,
                             llvm::Intrinsic::objc_storeWeak, ignored);
2580}

2582/// i8* \@objc_initWeak(i8** %addr, i8* %value)
2583/// Returns %value.  %addr is known to not have a current weak entry.
2584/// Essentially equivalent to:
2585///   *addr = nil; objc_storeWeak(addr, value);
2586void CodeGenFunction::EmitARCInitWeak(Address addr, llvm::Value *value) {
// If we're initializing to null, just write null to memory; no need
// to get the runtime involved.  But don't do this if optimization
// is enabled, because accounting for this would make the optimizer
// much more complicated.
if (isa<llvm::ConstantPointerNull>(value) &&
    CGM.getCodeGenOpts().OptimizationLevel == 0) {
  Builder.CreateStore(value, addr);
  return;
}

emitARCStoreOperation(*this, addr, value,
                      CGM.getObjCEntrypoints().objc_initWeak,
                      llvm::Intrinsic::objc_initWeak, /*ignored*/ true);
2600}

2602/// void \@objc_destroyWeak(i8** %addr)
2603/// Essentially objc_storeWeak(addr, nil).
2604void CodeGenFunction::EmitARCDestroyWeak(Address addr) {
llvm::Function *&fn = CGM.getObjCEntrypoints().objc_destroyWeak;
if (!fn) {
  fn = CGM.getIntrinsic(llvm::Intrinsic::objc_destroyWeak);
  setARCRuntimeFunctionLinkage(CGM, fn);
}

// Cast the argument to 'id*'.
addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);

EmitNounwindRuntimeCall(fn, addr.getPointer());
2615}

2617/// void \@objc_moveWeak(i8** %dest, i8** %src)
2618/// Disregards the current value in %dest.  Leaves %src pointing to nothing.
2619/// Essentially (objc_copyWeak(dest, src), objc_destroyWeak(src)).
2620void CodeGenFunction::EmitARCMoveWeak(Address dst, Address src) {
emitARCCopyOperation(*this, dst, src,
                     CGM.getObjCEntrypoints().objc_moveWeak,
                     llvm::Intrinsic::objc_moveWeak);
2624}

2626/// void \@objc_copyWeak(i8** %dest, i8** %src)
2627/// Disregards the current value in %dest.  Essentially
2628///   objc_release(objc_initWeak(dest, objc_readWeakRetained(src)))
2629void CodeGenFunction::EmitARCCopyWeak(Address dst, Address src) {
emitARCCopyOperation(*this, dst, src,
                     CGM.getObjCEntrypoints().objc_copyWeak,
                     llvm::Intrinsic::objc_copyWeak);
2633}

2635void CodeGenFunction::emitARCCopyAssignWeak(QualType Ty, Address DstAddr,
                                          Address SrcAddr) {
llvm::Value *Object = EmitARCLoadWeakRetained(SrcAddr);
Object = EmitObjCConsumeObject(Ty, Object);
EmitARCStoreWeak(DstAddr, Object, false);
2640}

2642void CodeGenFunction::emitARCMoveAssignWeak(QualType Ty, Address DstAddr,
                                          Address SrcAddr) {
llvm::Value *Object = EmitARCLoadWeakRetained(SrcAddr);
Object = EmitObjCConsumeObject(Ty, Object);
EmitARCStoreWeak(DstAddr, Object, false);
EmitARCDestroyWeak(SrcAddr);
2648}

2650/// Produce the code to do a objc_autoreleasepool_push.
2651///   call i8* \@objc_autoreleasePoolPush(void)
2652llvm::Value *CodeGenFunction::EmitObjCAutoreleasePoolPush() {
llvm::Function *&fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPush;
if (!fn) {
  fn = CGM.getIntrinsic(llvm::Intrinsic::objc_autoreleasePoolPush);
  setARCRuntimeFunctionLinkage(CGM, fn);
}

return EmitNounwindRuntimeCall(fn);
2660}

2662/// Produce the code to do a primitive release.
2663///   call void \@objc_autoreleasePoolPop(i8* %ptr)
2664void CodeGenFunction::EmitObjCAutoreleasePoolPop(llvm::Value *value) {
assert(value->getType() == Int8PtrTy)((void)0);

if (getInvokeDest()) {
  // Call the runtime method not the intrinsic if we are handling exceptions
  llvm::FunctionCallee &fn =
      CGM.getObjCEntrypoints().objc_autoreleasePoolPopInvoke;
  if (!fn) {
    llvm::FunctionType *fnType =
      llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
    fn = CGM.CreateRuntimeFunction(fnType, "objc_autoreleasePoolPop");
    setARCRuntimeFunctionLinkage(CGM, fn);
  }

  // objc_autoreleasePoolPop can throw.
  EmitRuntimeCallOrInvoke(fn, value);
} else {
  llvm::FunctionCallee &fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPop;
  if (!fn) {
    fn = CGM.getIntrinsic(llvm::Intrinsic::objc_autoreleasePoolPop);
    setARCRuntimeFunctionLinkage(CGM, fn);
  }

  EmitRuntimeCall(fn, value);
}
2689}

2691/// Produce the code to do an MRR version objc_autoreleasepool_push.
2692/// Which is: [[NSAutoreleasePool alloc] init];
2693/// Where alloc is declared as: + (id) alloc; in NSAutoreleasePool class.
2694/// init is declared as: - (id) init; in its NSObject super class.
2695///
2696llvm::Value *CodeGenFunction::EmitObjCMRRAutoreleasePoolPush() {
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
llvm::Value *Receiver = Runtime.EmitNSAutoreleasePoolClassRef(*this);
// [NSAutoreleasePool alloc]
IdentifierInfo *II = &CGM.getContext().Idents.get("alloc");
Selector AllocSel = getContext().Selectors.getSelector(0, &II);
CallArgList Args;
RValue AllocRV =
  Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
                              getContext().getObjCIdType(),
                              AllocSel, Receiver, Args);

// [Receiver init]
Receiver = AllocRV.getScalarVal();
II = &CGM.getContext().Idents.get("init");
Selector InitSel = getContext().Selectors.getSelector(0, &II);
RValue InitRV =
  Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
                              getContext().getObjCIdType(),
                              InitSel, Receiver, Args);
return InitRV.getScalarVal();
2717}

2719/// Allocate the given objc object.
2720///   call i8* \@objc_alloc(i8* %value)
2721llvm::Value *CodeGenFunction::EmitObjCAlloc(llvm::Value *value,
                                          llvm::Type *resultType) {
return emitObjCValueOperation(*this, value, resultType,
                              CGM.getObjCEntrypoints().objc_alloc,
                              "objc_alloc");
2726}

2728/// Allocate the given objc object.
2729///   call i8* \@objc_allocWithZone(i8* %value)
2730llvm::Value *CodeGenFunction::EmitObjCAllocWithZone(llvm::Value *value,
                                                  llvm::Type *resultType) {
return emitObjCValueOperation(*this, value, resultType,
                              CGM.getObjCEntrypoints().objc_allocWithZone,
                              "objc_allocWithZone");
2735}

2737llvm::Value *CodeGenFunction::EmitObjCAllocInit(llvm::Value *value,
                                              llvm::Type *resultType) {
return emitObjCValueOperation(*this, value, resultType,
                              CGM.getObjCEntrypoints().objc_alloc_init,
                              "objc_alloc_init");
2742}

2744/// Produce the code to do a primitive release.
2745/// [tmp drain];
2746void CodeGenFunction::EmitObjCMRRAutoreleasePoolPop(llvm::Value *Arg) {
IdentifierInfo *II = &CGM.getContext().Idents.get("drain");
Selector DrainSel = getContext().Selectors.getSelector(0, &II);
CallArgList Args;
CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
                            getContext().VoidTy, DrainSel, Arg, Args);
2752}

2754void CodeGenFunction::destroyARCStrongPrecise(CodeGenFunction &CGF,
                                            Address addr,
                                            QualType type) {
CGF.EmitARCDestroyStrong(addr, ARCPreciseLifetime);
2758}

2760void CodeGenFunction::destroyARCStrongImprecise(CodeGenFunction &CGF,
                                              Address addr,
                                              QualType type) {
CGF.EmitARCDestroyStrong(addr, ARCImpreciseLifetime);
2764}

2766void CodeGenFunction::destroyARCWeak(CodeGenFunction &CGF,
                                   Address addr,
                                   QualType type) {
CGF.EmitARCDestroyWeak(addr);
2770}

2772void CodeGenFunction::emitARCIntrinsicUse(CodeGenFunction &CGF, Address addr,
                                        QualType type) {
llvm::Value *value = CGF.Builder.CreateLoad(addr);
CGF.EmitARCIntrinsicUse(value);
2776}

2778/// Autorelease the given object.
2779///   call i8* \@objc_autorelease(i8* %value)
2780llvm::Value *CodeGenFunction::EmitObjCAutorelease(llvm::Value *value,
                                                llvm::Type *returnType) {
return emitObjCValueOperation(
    *this, value, returnType,
    CGM.getObjCEntrypoints().objc_autoreleaseRuntimeFunction,
    "objc_autorelease");
2786}

2788/// Retain the given object, with normal retain semantics.
2789///   call i8* \@objc_retain(i8* %value)
2790llvm::Value *CodeGenFunction::EmitObjCRetainNonBlock(llvm::Value *value,
                                                   llvm::Type *returnType) {
return emitObjCValueOperation(
    *this, value, returnType,
    CGM.getObjCEntrypoints().objc_retainRuntimeFunction, "objc_retain");
2795}

2797/// Release the given object.
2798///   call void \@objc_release(i8* %value)
2799void CodeGenFunction::EmitObjCRelease(llvm::Value *value,
                                    ARCPreciseLifetime_t precise) {
if (isa<llvm::ConstantPointerNull>(value)) return;

llvm::FunctionCallee &fn =
    CGM.getObjCEntrypoints().objc_releaseRuntimeFunction;
if (!fn) {
  llvm::FunctionType *fnType =
      llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
  fn = CGM.CreateRuntimeFunction(fnType, "objc_release");
  setARCRuntimeFunctionLinkage(CGM, fn);
  // We have Native ARC, so set nonlazybind attribute for performance
  if (llvm::Function *f = dyn_cast<llvm::Function>(fn.getCallee()))
    f->addFnAttr(llvm::Attribute::NonLazyBind);
}

// Cast the argument to 'id'.
value = Builder.CreateBitCast(value, Int8PtrTy);

// Call objc_release.
llvm::CallBase *call = EmitCallOrInvoke(fn, value);

if (precise == ARCImpreciseLifetime) {
  call->setMetadata("clang.imprecise_release",
                    llvm::MDNode::get(Builder.getContext(), None));
}
2825}

2827namespace {
struct CallObjCAutoreleasePoolObject final : EHScopeStack::Cleanup {
  llvm::Value *Token;

  CallObjCAutoreleasePoolObject(llvm::Value *token) : Token(token) {}

  void Emit(CodeGenFunction &CGF, Flags flags) override {
    CGF.EmitObjCAutoreleasePoolPop(Token);
  }
};
struct CallObjCMRRAutoreleasePoolObject final : EHScopeStack::Cleanup {
  llvm::Value *Token;

  CallObjCMRRAutoreleasePoolObject(llvm::Value *token) : Token(token) {}

  void Emit(CodeGenFunction &CGF, Flags flags) override {
    CGF.EmitObjCMRRAutoreleasePoolPop(Token);
  }
};
2846}

2848void CodeGenFunction::EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr) {
if (CGM.getLangOpts().ObjCAutoRefCount)
  EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, Ptr);
else
  EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, Ptr);
2853}

2855static bool shouldRetainObjCLifetime(Qualifiers::ObjCLifetime lifetime) {
switch (lifetime) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
  return true;

case Qualifiers::OCL_Weak:
  return false;
}

llvm_unreachable("impossible lifetime!")__builtin_unreachable();
2868}

2870static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
                                                LValue lvalue,
                                                QualType type) {
llvm::Value *result;
bool shouldRetain = shouldRetainObjCLifetime(type.getObjCLifetime());
if (shouldRetain) {
  result = CGF.EmitLoadOfLValue(lvalue, SourceLocation()).getScalarVal();
} else {
  assert(type.getObjCLifetime() == Qualifiers::OCL_Weak)((void)0);
  result = CGF.EmitARCLoadWeakRetained(lvalue.getAddress(CGF));
}
return TryEmitResult(result, !shouldRetain);
2882}

2884static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
                                                const Expr *e) {
e = e->IgnoreParens();
QualType type = e->getType();

// If we're loading retained from a __strong xvalue, we can avoid
// an extra retain/release pair by zeroing out the source of this
// "move" operation.
if (e->isXValue() &&
    !type.isConstQualified() &&
    type.getObjCLifetime() == Qualifiers::OCL_Strong) {
  // Emit the lvalue.
  LValue lv = CGF.EmitLValue(e);

  // Load the object pointer.
  llvm::Value *result = CGF.EmitLoadOfLValue(lv,
                                             SourceLocation()).getScalarVal();

  // Set the source pointer to NULL.
  CGF.EmitStoreOfScalar(getNullForVariable(lv.getAddress(CGF)), lv);

  return TryEmitResult(result, true);
}

// As a very special optimization, in ARC++, if the l-value is the
// result of a non-volatile assignment, do a simple retain of the
// result of the call to objc_storeWeak instead of reloading.
if (CGF.getLangOpts().CPlusPlus &&
    !type.isVolatileQualified() &&
    type.getObjCLifetime() == Qualifiers::OCL_Weak &&
    isa<BinaryOperator>(e) &&
    cast<BinaryOperator>(e)->getOpcode() == BO_Assign)
  return TryEmitResult(CGF.EmitScalarExpr(e), false);

// Try to emit code for scalar constant instead of emitting LValue and
// loading it because we are not guaranteed to have an l-value. One of such
// cases is DeclRefExpr referencing non-odr-used constant-evaluated variable.
if (const auto *decl_expr = dyn_cast<DeclRefExpr>(e)) {
  auto *DRE = const_cast<DeclRefExpr *>(decl_expr);
  if (CodeGenFunction::ConstantEmission constant = CGF.tryEmitAsConstant(DRE))
    return TryEmitResult(CGF.emitScalarConstant(constant, DRE),
                         !shouldRetainObjCLifetime(type.getObjCLifetime()));
}

return tryEmitARCRetainLoadOfScalar(CGF, CGF.EmitLValue(e), type);
2929}

2931typedef llvm::function_ref<llvm::Value *(CodeGenFunction &CGF,
                                       llvm::Value *value)>
ValueTransform;

2935/// Insert code immediately after a call.

2937// FIXME: We should find a way to emit the runtime call immediately
2938// after the call is emitted to eliminate the need for this function.
2939static llvm::Value *emitARCOperationAfterCall(CodeGenFunction &CGF,
                                            llvm::Value *value,
                                            ValueTransform doAfterCall,
                                            ValueTransform doFallback) {
CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
auto *callBase = dyn_cast<llvm::CallBase>(value);

if (callBase && llvm::objcarc::hasAttachedCallOpBundle(callBase)) {
  // Fall back if the call base has operand bundle "clang.arc.attachedcall".
  value = doFallback(CGF, value);
} else if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(value)) {
  // Place the retain immediately following the call.
  CGF.Builder.SetInsertPoint(call->getParent(),
                             ++llvm::BasicBlock::iterator(call));
  value = doAfterCall(CGF, value);
} else if (llvm::InvokeInst *invoke = dyn_cast<llvm::InvokeInst>(value)) {
  // Place the retain at the beginning of the normal destination block.
  llvm::BasicBlock *BB = invoke->getNormalDest();
  CGF.Builder.SetInsertPoint(BB, BB->begin());
  value = doAfterCall(CGF, value);

// Bitcasts can arise because of related-result returns.  Rewrite
// the operand.
} else if (llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(value)) {
  // Change the insert point to avoid emitting the fall-back call after the
  // bitcast.
  CGF.Builder.SetInsertPoint(bitcast->getParent(), bitcast->getIterator());
  llvm::Value *operand = bitcast->getOperand(0);
  operand = emitARCOperationAfterCall(CGF, operand, doAfterCall, doFallback);
  bitcast->setOperand(0, operand);
  value = bitcast;
} else {
  auto *phi = dyn_cast<llvm::PHINode>(value);
  if (phi && phi->getNumIncomingValues() == 2 &&
      isa<llvm::ConstantPointerNull>(phi->getIncomingValue(1)) &&
      isa<llvm::CallBase>(phi->getIncomingValue(0))) {
    // Handle phi instructions that are generated when it's necessary to check
    // whether the receiver of a message is null.
    llvm::Value *inVal = phi->getIncomingValue(0);
    inVal = emitARCOperationAfterCall(CGF, inVal, doAfterCall, doFallback);
    phi->setIncomingValue(0, inVal);
    value = phi;
  } else {
    // Generic fall-back case.
    // Retain using the non-block variant: we never need to do a copy
    // of a block that's been returned to us.
    value = doFallback(CGF, value);
  }
}

CGF.Builder.restoreIP(ip);
return value;
2991}

2993/// Given that the given expression is some sort of call (which does
2994/// not return retained), emit a retain following it.
2995static llvm::Value *emitARCRetainCallResult(CodeGenFunction &CGF,
                                          const Expr *e) {
llvm::Value *value = CGF.EmitScalarExpr(e);
return emitARCOperationAfterCall(CGF, value,
         [](CodeGenFunction &CGF, llvm::Value *value) {
           return CGF.EmitARCRetainAutoreleasedReturnValue(value);
         },
         [](CodeGenFunction &CGF, llvm::Value *value) {
           return CGF.EmitARCRetainNonBlock(value);
         });
3005}

3007/// Given that the given expression is some sort of call (which does
3008/// not return retained), perform an unsafeClaim following it.
3009static llvm::Value *emitARCUnsafeClaimCallResult(CodeGenFunction &CGF,
                                               const Expr *e) {
llvm::Value *value = CGF.EmitScalarExpr(e);
return emitARCOperationAfterCall(CGF, value,
         [](CodeGenFunction &CGF, llvm::Value *value) {
           return CGF.EmitARCUnsafeClaimAutoreleasedReturnValue(value);
         },
         [](CodeGenFunction &CGF, llvm::Value *value) {
           return value;
         });
3019}

3021llvm::Value *CodeGenFunction::EmitARCReclaimReturnedObject(const Expr *E,
                                                    bool allowUnsafeClaim) {
if (allowUnsafeClaim &&
    CGM.getLangOpts().ObjCRuntime.hasARCUnsafeClaimAutoreleasedReturnValue()) {
  return emitARCUnsafeClaimCallResult(*this, E);
} else {
  llvm::Value *value = emitARCRetainCallResult(*this, E);
  return EmitObjCConsumeObject(E->getType(), value);
}
3030}

3032/// Determine whether it might be important to emit a separate
3033/// objc_retain_block on the result of the given expression, or
3034/// whether it's okay to just emit it in a +1 context.
3035static bool shouldEmitSeparateBlockRetain(const Expr *e) {
assert(e->getType()->isBlockPointerType())((void)0);
e = e->IgnoreParens();

// For future goodness, emit block expressions directly in +1
// contexts if we can.
if (isa<BlockExpr>(e))
  return false;

if (const CastExpr *cast = dyn_cast<CastExpr>(e)) {
  switch (cast->getCastKind()) {
  // Emitting these operations in +1 contexts is goodness.
  case CK_LValueToRValue:
  case CK_ARCReclaimReturnedObject:
  case CK_ARCConsumeObject:
  case CK_ARCProduceObject:
    return false;

  // These operations preserve a block type.
  case CK_NoOp:
  case CK_BitCast:
    return shouldEmitSeparateBlockRetain(cast->getSubExpr());

  // These operations are known to be bad (or haven't been considered).
  case CK_AnyPointerToBlockPointerCast:
  default:
    return true;
  }
}

return true;
3066}

3068namespace {
3069/// A CRTP base class for emitting expressions of retainable object
3070/// pointer type in ARC.
3071template <typename Impl, typename Result> class ARCExprEmitter {
3072protected:
CodeGenFunction &CGF;
Impl &asImpl() { return *static_cast<Impl*>(this); }

ARCExprEmitter(CodeGenFunction &CGF) : CGF(CGF) {}

3078public:
Result visit(const Expr *e);
Result visitCastExpr(const CastExpr *e);
Result visitPseudoObjectExpr(const PseudoObjectExpr *e);
Result visitBlockExpr(const BlockExpr *e);
Result visitBinaryOperator(const BinaryOperator *e);
Result visitBinAssign(const BinaryOperator *e);
Result visitBinAssignUnsafeUnretained(const BinaryOperator *e);
Result visitBinAssignAutoreleasing(const BinaryOperator *e);
Result visitBinAssignWeak(const BinaryOperator *e);
Result visitBinAssignStrong(const BinaryOperator *e);

// Minimal implementation:
//   Result visitLValueToRValue(const Expr *e)
//   Result visitConsumeObject(const Expr *e)
//   Result visitExtendBlockObject(const Expr *e)
//   Result visitReclaimReturnedObject(const Expr *e)
//   Result visitCall(const Expr *e)
//   Result visitExpr(const Expr *e)
//
//   Result emitBitCast(Result result, llvm::Type *resultType)
//   llvm::Value *getValueOfResult(Result result)
3100};
3101}

3103/// Try to emit a PseudoObjectExpr under special ARC rules.
3104///
3105/// This massively duplicates emitPseudoObjectRValue.
3106template <typename Impl, typename Result>
3107Result
3108ARCExprEmitter<Impl,Result>::visitPseudoObjectExpr(const PseudoObjectExpr *E) {
SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;

// Find the result expression.
const Expr *resultExpr = E->getResultExpr();
assert(resultExpr)((void)0);
Result result;
17
←
'result' declared without an initial value→

for (PseudoObjectExpr::const_semantics_iterator
18
←
Loop condition is false. Execution continues on line 3152→
       i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
  const Expr *semantic = *i;

  // If this semantic expression is an opaque value, bind it
  // to the result of its source expression.
  if (const OpaqueValueExpr *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
    typedef CodeGenFunction::OpaqueValueMappingData OVMA;
    OVMA opaqueData;

    // If this semantic is the result of the pseudo-object
    // expression, try to evaluate the source as +1.
    if (ov == resultExpr) {
      assert(!OVMA::shouldBindAsLValue(ov))((void)0);
      result = asImpl().visit(ov->getSourceExpr());
      opaqueData = OVMA::bind(CGF, ov,
                          RValue::get(asImpl().getValueOfResult(result)));

    // Otherwise, just bind it.
    } else {
      opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
    }
    opaques.push_back(opaqueData);

  // Otherwise, if the expression is the result, evaluate it
  // and remember the result.
  } else if (semantic == resultExpr) {
    result = asImpl().visit(semantic);

  // Otherwise, evaluate the expression in an ignored context.
  } else {
    CGF.EmitIgnoredExpr(semantic);
  }
}

// Unbind all the opaques now.
for (unsigned i = 0, e = opaques.size(); i != e; ++i)
19
←
Assuming 'i' is equal to 'e'→
20
←
Loop condition is false. Execution continues on line 3155→
  opaques[i].unbind(CGF);

return result;
21
←
Undefined or garbage value returned to caller
3156}

3158template <typename Impl, typename Result>
3159Result ARCExprEmitter<Impl, Result>::visitBlockExpr(const BlockExpr *e) {
// The default implementation just forwards the expression to visitExpr.
return asImpl().visitExpr(e);
3162}

3164template <typename Impl, typename Result>
3165Result ARCExprEmitter<Impl,Result>::visitCastExpr(const CastExpr *e) {
switch (e->getCastKind()) {

// No-op casts don't change the type, so we just ignore them.
case CK_NoOp:
  return asImpl().visit(e->getSubExpr());

// These casts can change the type.
case CK_CPointerToObjCPointerCast:
case CK_BlockPointerToObjCPointerCast:
case CK_AnyPointerToBlockPointerCast:
case CK_BitCast: {
  llvm::Type *resultType = CGF.ConvertType(e->getType());
  assert(e->getSubExpr()->getType()->hasPointerRepresentation())((void)0);
  Result result = asImpl().visit(e->getSubExpr());
  return asImpl().emitBitCast(result, resultType);
}

// Handle some casts specially.
case CK_LValueToRValue:
  return asImpl().visitLValueToRValue(e->getSubExpr());
case CK_ARCConsumeObject:
  return asImpl().visitConsumeObject(e->getSubExpr());
case CK_ARCExtendBlockObject:
  return asImpl().visitExtendBlockObject(e->getSubExpr());
case CK_ARCReclaimReturnedObject:
  return asImpl().visitReclaimReturnedObject(e->getSubExpr());

// Otherwise, use the default logic.
default:
  return asImpl().visitExpr(e);
}
3197}

3199template <typename Impl, typename Result>
3200Result
3201ARCExprEmitter<Impl,Result>::visitBinaryOperator(const BinaryOperator *e) {
switch (e->getOpcode()) {
case BO_Comma:
  CGF.EmitIgnoredExpr(e->getLHS());
  CGF.EnsureInsertPoint();
  return asImpl().visit(e->getRHS());

case BO_Assign:
  return asImpl().visitBinAssign(e);

default:
  return asImpl().visitExpr(e);
}
3214}

3216template <typename Impl, typename Result>
3217Result ARCExprEmitter<Impl,Result>::visitBinAssign(const BinaryOperator *e) {
switch (e->getLHS()->getType().getObjCLifetime()) {
case Qualifiers::OCL_ExplicitNone:
  return asImpl().visitBinAssignUnsafeUnretained(e);

case Qualifiers::OCL_Weak:
  return asImpl().visitBinAssignWeak(e);

case Qualifiers::OCL_Autoreleasing:
  return asImpl().visitBinAssignAutoreleasing(e);

case Qualifiers::OCL_Strong:
  return asImpl().visitBinAssignStrong(e);

case Qualifiers::OCL_None:
  return asImpl().visitExpr(e);
}
llvm_unreachable("bad ObjC ownership qualifier")__builtin_unreachable();
3235}

3237/// The default rule for __unsafe_unretained emits the RHS recursively,
3238/// stores into the unsafe variable, and propagates the result outward.
3239template <typename Impl, typename Result>
3240Result ARCExprEmitter<Impl,Result>::
                  visitBinAssignUnsafeUnretained(const BinaryOperator *e) {
// Recursively emit the RHS.
// For __block safety, do this before emitting the LHS.
Result result = asImpl().visit(e->getRHS());

// Perform the store.
LValue lvalue =
  CGF.EmitCheckedLValue(e->getLHS(), CodeGenFunction::TCK_Store);
CGF.EmitStoreThroughLValue(RValue::get(asImpl().getValueOfResult(result)),
                           lvalue);

return result;
3253}

3255template <typename Impl, typename Result>
3256Result
3257ARCExprEmitter<Impl,Result>::visitBinAssignAutoreleasing(const BinaryOperator *e) {
return asImpl().visitExpr(e);
3259}

3261template <typename Impl, typename Result>
3262Result
3263ARCExprEmitter<Impl,Result>::visitBinAssignWeak(const BinaryOperator *e) {
return asImpl().visitExpr(e);
3265}

3267template <typename Impl, typename Result>
3268Result
3269ARCExprEmitter<Impl,Result>::visitBinAssignStrong(const BinaryOperator *e) {
return asImpl().visitExpr(e);
3271}

3273/// The general expression-emission logic.
3274template <typename Impl, typename Result>
3275Result ARCExprEmitter<Impl,Result>::visit(const Expr *e) {
// We should *never* see a nested full-expression here, because if
// we fail to emit at +1, our caller must not retain after we close
// out the full-expression.  This isn't as important in the unsafe
// emitter.
assert(!isa<ExprWithCleanups>(e))((void)0);

// Look through parens, __extension__, generic selection, etc.
e = e->IgnoreParens();

// Handle certain kinds of casts.
if (const CastExpr *ce8.1
'ce' is null
 = dyn_cast<CastExpr>(e)) {
8
←
Assuming 'e' is not a 'CastExpr'→
9
←
Taking false branch→
  return asImpl().visitCastExpr(ce);

// Handle the comma operator.
} else if (auto op10.1
'op' is null
 = dyn_cast<BinaryOperator>(e)) {
10
←
Assuming 'e' is not a 'BinaryOperator'→
11
←
Taking false branch→
  return asImpl().visitBinaryOperator(op);

// TODO: handle conditional operators here

// For calls and message sends, use the retained-call logic.
// Delegate inits are a special case in that they're the only
// returns-retained expression that *isn't* surrounded by
// a consume.
} else if (isa<CallExpr>(e) ||
12
←
Assuming 'e' is not a 'CallExpr'→
           (isa<ObjCMessageExpr>(e) &&
13
←
Assuming 'e' is not a 'ObjCMessageExpr'→
            !cast<ObjCMessageExpr>(e)->isDelegateInitCall())) {
  return asImpl().visitCall(e);

// Look through pseudo-object expressions.
} else if (const PseudoObjectExpr *pseudo14.1
'pseudo' is non-null
 = dyn_cast<PseudoObjectExpr>(e)) {
14
←
Assuming 'e' is a 'PseudoObjectExpr'→
15
←
Taking true branch→
  return asImpl().visitPseudoObjectExpr(pseudo);
16
←
Calling 'ARCExprEmitter::visitPseudoObjectExpr'→
} else if (auto *be = dyn_cast<BlockExpr>(e))
  return asImpl().visitBlockExpr(be);

return asImpl().visitExpr(e);
3311}

3313namespace {

3315/// An emitter for +1 results.
3316struct ARCRetainExprEmitter :
public ARCExprEmitter<ARCRetainExprEmitter, TryEmitResult> {

ARCRetainExprEmitter(CodeGenFunction &CGF) : ARCExprEmitter(CGF) {}

llvm::Value *getValueOfResult(TryEmitResult result) {
  return result.getPointer();
}

TryEmitResult emitBitCast(TryEmitResult result, llvm::Type *resultType) {
  llvm::Value *value = result.getPointer();
  value = CGF.Builder.CreateBitCast(value, resultType);
  result.setPointer(value);
  return result;
}

TryEmitResult visitLValueToRValue(const Expr *e) {
  return tryEmitARCRetainLoadOfScalar(CGF, e);
}

/// For consumptions, just emit the subexpression and thus elide
/// the retain/release pair.
TryEmitResult visitConsumeObject(const Expr *e) {
  llvm::Value *result = CGF.EmitScalarExpr(e);
  return TryEmitResult(result, true);
}

TryEmitResult visitBlockExpr(const BlockExpr *e) {
  TryEmitResult result = visitExpr(e);
  // Avoid the block-retain if this is a block literal that doesn't need to be
  // copied to the heap.
  if (e->getBlockDecl()->canAvoidCopyToHeap())
    result.setInt(true);
  return result;
}

/// Block extends are net +0.  Naively, we could just recurse on
/// the subexpression, but actually we need to ensure that the
/// value is copied as a block, so there's a little filter here.
TryEmitResult visitExtendBlockObject(const Expr *e) {
  llvm::Value *result; // will be a +0 value

  // If we can't safely assume the sub-expression will produce a
  // block-copied value, emit the sub-expression at +0.
  if (shouldEmitSeparateBlockRetain(e)) {
    result = CGF.EmitScalarExpr(e);

  // Otherwise, try to emit the sub-expression at +1 recursively.
  } else {
    TryEmitResult subresult = asImpl().visit(e);

    // If that produced a retained value, just use that.
    if (subresult.getInt()) {
      return subresult;
    }

    // Otherwise it's +0.
    result = subresult.getPointer();
  }

  // Retain the object as a block.
  result = CGF.EmitARCRetainBlock(result, /*mandatory*/ true);
  return TryEmitResult(result, true);
}

/// For reclaims, emit the subexpression as a retained call and
/// skip the consumption.
TryEmitResult visitReclaimReturnedObject(const Expr *e) {
  llvm::Value *result = emitARCRetainCallResult(CGF, e);
  return TryEmitResult(result, true);
}

/// When we have an undecorated call, retroactively do a claim.
TryEmitResult visitCall(const Expr *e) {
  llvm::Value *result = emitARCRetainCallResult(CGF, e);
  return TryEmitResult(result, true);
}

// TODO: maybe special-case visitBinAssignWeak?

TryEmitResult visitExpr(const Expr *e) {
  // We didn't find an obvious production, so emit what we've got and
  // tell the caller that we didn't manage to retain.
  llvm::Value *result = CGF.EmitScalarExpr(e);
  return TryEmitResult(result, false);
}
3402};
3403}

3405static TryEmitResult
3406tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) {
return ARCRetainExprEmitter(CGF).visit(e);
3408}

3410static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF,
                                              LValue lvalue,
                                              QualType type) {
TryEmitResult result = tryEmitARCRetainLoadOfScalar(CGF, lvalue, type);
llvm::Value *value = result.getPointer();
if (!result.getInt())
  value = CGF.EmitARCRetain(type, value);
return value;
3418}

3420/// EmitARCRetainScalarExpr - Semantically equivalent to
3421/// EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a
3422/// best-effort attempt to peephole expressions that naturally produce
3423/// retained objects.
3424llvm::Value *CodeGenFunction::EmitARCRetainScalarExpr(const Expr *e) {
// The retain needs to happen within the full-expression.
if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
  RunCleanupsScope scope(*this);
  return EmitARCRetainScalarExpr(cleanups->getSubExpr());
}

TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
llvm::Value *value = result.getPointer();
if (!result.getInt())
  value = EmitARCRetain(e->getType(), value);
return value;
3436}

3438llvm::Value *
3439CodeGenFunction::EmitARCRetainAutoreleaseScalarExpr(const Expr *e) {
// The retain needs to happen within the full-expression.
if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
  RunCleanupsScope scope(*this);
  return EmitARCRetainAutoreleaseScalarExpr(cleanups->getSubExpr());
}

TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
llvm::Value *value = result.getPointer();
if (result.getInt())
  value = EmitARCAutorelease(value);
else
  value = EmitARCRetainAutorelease(e->getType(), value);
return value;
3453}

3455llvm::Value *CodeGenFunction::EmitARCExtendBlockObject(const Expr *e) {
llvm::Value *result;
bool doRetain;

if (shouldEmitSeparateBlockRetain(e)) {
  result = EmitScalarExpr(e);
  doRetain = true;
} else {
  TryEmitResult subresult = tryEmitARCRetainScalarExpr(*this, e);
  result = subresult.getPointer();
  doRetain = !subresult.getInt();
}

if (doRetain)
  result = EmitARCRetainBlock(result, /*mandatory*/ true);
return EmitObjCConsumeObject(e->getType(), result);
3471}

3473llvm::Value *CodeGenFunction::EmitObjCThrowOperand(const Expr *expr) {
// In ARC, retain and autorelease the expression.
if (getLangOpts().ObjCAutoRefCount) {
  // Do so before running any cleanups for the full-expression.
  // EmitARCRetainAutoreleaseScalarExpr does this for us.
  return EmitARCRetainAutoreleaseScalarExpr(expr);
}

// Otherwise, use the normal scalar-expression emission.  The
// exception machinery doesn't do anything special with the
// exception like retaining it, so there's no safety associated with
// only running cleanups after the throw has started, and when it
// matters it tends to be substantially inferior code.
return EmitScalarExpr(expr);
3487}

3489namespace {

3491/// An emitter for assigning into an __unsafe_unretained context.
3492struct ARCUnsafeUnretainedExprEmitter :
public ARCExprEmitter<ARCUnsafeUnretainedExprEmitter, llvm::Value*> {

ARCUnsafeUnretainedExprEmitter(CodeGenFunction &CGF) : ARCExprEmitter(CGF) {}

llvm::Value *getValueOfResult(llvm::Value *value) {
  return value;
}

llvm::Value *emitBitCast(llvm::Value *value, llvm::Type *resultType) {
  return CGF.Builder.CreateBitCast(value, resultType);
}

llvm::Value *visitLValueToRValue(const Expr *e) {
  return CGF.EmitScalarExpr(e);
}

/// For consumptions, just emit the subexpression and perform the
/// consumption like normal.
llvm::Value *visitConsumeObject(const Expr *e) {
  llvm::Value *value = CGF.EmitScalarExpr(e);
  return CGF.EmitObjCConsumeObject(e->getType(), value);
}

/// No special logic for block extensions.  (This probably can't
/// actually happen in this emitter, though.)
llvm::Value *visitExtendBlockObject(const Expr *e) {
  return CGF.EmitARCExtendBlockObject(e);
}

/// For reclaims, perform an unsafeClaim if that's enabled.
llvm::Value *visitReclaimReturnedObject(const Expr *e) {
  return CGF.EmitARCReclaimReturnedObject(e, /*unsafe*/ true);
}

/// When we have an undecorated call, just emit it without adding
/// the unsafeClaim.
llvm::Value *visitCall(const Expr *e) {
  return CGF.EmitScalarExpr(e);
}

/// Just do normal scalar emission in the default case.
llvm::Value *visitExpr(const Expr *e) {
  return CGF.EmitScalarExpr(e);
}
3537};
3538}

3540static llvm::Value *emitARCUnsafeUnretainedScalarExpr(CodeGenFunction &CGF,
                                                    const Expr *e) {
return ARCUnsafeUnretainedExprEmitter(CGF).visit(e);
7
←
Calling 'ARCExprEmitter::visit'→
3543}

3545/// EmitARCUnsafeUnretainedScalarExpr - Semantically equivalent to
3546/// immediately releasing the resut of EmitARCRetainScalarExpr, but
3547/// avoiding any spurious retains, including by performing reclaims
3548/// with objc_unsafeClaimAutoreleasedReturnValue.
3549llvm::Value *CodeGenFunction::EmitARCUnsafeUnretainedScalarExpr(const Expr *e) {
// Look through full-expressions.
if (const ExprWithCleanups *cleanups4.1
'cleanups' is null
 = dyn_cast<ExprWithCleanups>(e)) {
4
←
Assuming 'e' is not a 'ExprWithCleanups'→
5
←
Taking false branch→
  RunCleanupsScope scope(*this);
  return emitARCUnsafeUnretainedScalarExpr(*this, cleanups->getSubExpr());
}

return emitARCUnsafeUnretainedScalarExpr(*this, e);
6
←
Calling 'emitARCUnsafeUnretainedScalarExpr'→
3557}

3559std::pair<LValue,llvm::Value*>
3560CodeGenFunction::EmitARCStoreUnsafeUnretained(const BinaryOperator *e,
                                            bool ignored) {
// Evaluate the RHS first.  If we're ignoring the result, assume
// that we can emit at an unsafe +0.
llvm::Value *value;
if (ignored) {
1
Assuming 'ignored' is true→
2
←
Taking true branch→
  value = EmitARCUnsafeUnretainedScalarExpr(e->getRHS());
3
←
Calling 'CodeGenFunction::EmitARCUnsafeUnretainedScalarExpr'→
} else {
  value = EmitScalarExpr(e->getRHS());
}

// Emit the LHS and perform the store.
LValue lvalue = EmitLValue(e->getLHS());
EmitStoreOfScalar(value, lvalue);

return std::pair<LValue,llvm::Value*>(std::move(lvalue), value);
3576}

3578std::pair<LValue,llvm::Value*>
3579CodeGenFunction::EmitARCStoreStrong(const BinaryOperator *e,
                                  bool ignored) {
// Evaluate the RHS first.
TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e->getRHS());
llvm::Value *value = result.getPointer();

bool hasImmediateRetain = result.getInt();

// If we didn't emit a retained object, and the l-value is of block
// type, then we need to emit the block-retain immediately in case
// it invalidates the l-value.
if (!hasImmediateRetain && e->getType()->isBlockPointerType()) {
  value = EmitARCRetainBlock(value, /*mandatory*/ false);
  hasImmediateRetain = true;
}

LValue lvalue = EmitLValue(e->getLHS());

// If the RHS was emitted retained, expand this.
if (hasImmediateRetain) {
  llvm::Value *oldValue = EmitLoadOfScalar(lvalue, SourceLocation());
  EmitStoreOfScalar(value, lvalue);
  EmitARCRelease(oldValue, lvalue.isARCPreciseLifetime());
} else {
  value = EmitARCStoreStrong(lvalue, value, ignored);
}

return std::pair<LValue,llvm::Value*>(lvalue, value);
3607}

3609std::pair<LValue,llvm::Value*>
3610CodeGenFunction::EmitARCStoreAutoreleasing(const BinaryOperator *e) {
llvm::Value *value = EmitARCRetainAutoreleaseScalarExpr(e->getRHS());
LValue lvalue = EmitLValue(e->getLHS());

EmitStoreOfScalar(value, lvalue);

return std::pair<LValue,llvm::Value*>(lvalue, value);
3617}

3619void CodeGenFunction::EmitObjCAutoreleasePoolStmt(
                                        const ObjCAutoreleasePoolStmt &ARPS) {
const Stmt *subStmt = ARPS.getSubStmt();
const CompoundStmt &S = cast<CompoundStmt>(*subStmt);

CGDebugInfo *DI = getDebugInfo();
if (DI)
  DI->EmitLexicalBlockStart(Builder, S.getLBracLoc());

// Keep track of the current cleanup stack depth.
RunCleanupsScope Scope(*this);
if (CGM.getLangOpts().ObjCRuntime.hasNativeARC()) {
  llvm::Value *token = EmitObjCAutoreleasePoolPush();
  EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, token);
} else {
  llvm::Value *token = EmitObjCMRRAutoreleasePoolPush();
  EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, token);
}

for (const auto *I : S.body())
  EmitStmt(I);

if (DI)
  DI->EmitLexicalBlockEnd(Builder, S.getRBracLoc());
3643}

3645/// EmitExtendGCLifetime - Given a pointer to an Objective-C object,
3646/// make sure it survives garbage collection until this point.
3647void CodeGenFunction::EmitExtendGCLifetime(llvm::Value *object) {
// We just use an inline assembly.
llvm::FunctionType *extenderType
  = llvm::FunctionType::get(VoidTy, VoidPtrTy, RequiredArgs::All);
llvm::InlineAsm *extender = llvm::InlineAsm::get(extenderType,
                                                 /* assembly */ "",
                                                 /* constraints */ "r",
                                                 /* side effects */ true);

object = Builder.CreateBitCast(object, VoidPtrTy);
EmitNounwindRuntimeCall(extender, object);
3658}

3660/// GenerateObjCAtomicSetterCopyHelperFunction - Given a c++ object type with
3661/// non-trivial copy assignment function, produce following helper function.
3662/// static void copyHelper(Ty *dest, const Ty *source) { *dest = *source; }
3663///
3664llvm::Constant *
3665CodeGenFunction::GenerateObjCAtomicSetterCopyHelperFunction(
                                      const ObjCPropertyImplDecl *PID) {
if (!getLangOpts().CPlusPlus ||
    !getLangOpts().ObjCRuntime.hasAtomicCopyHelper())
  return nullptr;
QualType Ty = PID->getPropertyIvarDecl()->getType();
if (!Ty->isRecordType())
  return nullptr;
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
if ((!(PD->getPropertyAttributes() & ObjCPropertyAttribute::kind_atomic)))
  return nullptr;
llvm::Constant *HelperFn = nullptr;
if (hasTrivialSetExpr(PID))
  return nullptr;
assert(PID->getSetterCXXAssignment() && "SetterCXXAssignment - null")((void)0);
if ((HelperFn = CGM.getAtomicSetterHelperFnMap(Ty)))
  return HelperFn;

ASTContext &C = getContext();
IdentifierInfo *II
  = &CGM.getContext().Idents.get("__assign_helper_atomic_property_");

QualType ReturnTy = C.VoidTy;
QualType DestTy = C.getPointerType(Ty);
QualType SrcTy = Ty;
SrcTy.addConst();
SrcTy = C.getPointerType(SrcTy);

SmallVector<QualType, 2> ArgTys;
ArgTys.push_back(DestTy);
ArgTys.push_back(SrcTy);
QualType FunctionTy = C.getFunctionType(ReturnTy, ArgTys, {});

FunctionDecl *FD = FunctionDecl::Create(
    C, C.getTranslationUnitDecl(), SourceLocation(), SourceLocation(), II,
    FunctionTy, nullptr, SC_Static, false, false);

FunctionArgList args;
ParmVarDecl *Params[2];
ParmVarDecl *DstDecl = ParmVarDecl::Create(
    C, FD, SourceLocation(), SourceLocation(), nullptr, DestTy,
    C.getTrivialTypeSourceInfo(DestTy, SourceLocation()), SC_None,
    /*DefArg=*/nullptr);
args.push_back(Params[0] = DstDecl);
ParmVarDecl *SrcDecl = ParmVarDecl::Create(
    C, FD, SourceLocation(), SourceLocation(), nullptr, SrcTy,
    C.getTrivialTypeSourceInfo(SrcTy, SourceLocation()), SC_None,
    /*DefArg=*/nullptr);
args.push_back(Params[1] = SrcDecl);
FD->setParams(Params);

const CGFunctionInfo &FI =
    CGM.getTypes().arrangeBuiltinFunctionDeclaration(ReturnTy, args);

llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);

llvm::Function *Fn =
  llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
                         "__assign_helper_atomic_property_",
                         &CGM.getModule());

CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, FI);

StartFunction(FD, ReturnTy, Fn, FI, args);

DeclRefExpr DstExpr(C, DstDecl, false, DestTy, VK_PRValue, SourceLocation());
UnaryOperator *DST = UnaryOperator::Create(
    C, &DstExpr, UO_Deref, DestTy->getPointeeType(), VK_LValue, OK_Ordinary,
    SourceLocation(), false, FPOptionsOverride());

DeclRefExpr SrcExpr(C, SrcDecl, false, SrcTy, VK_PRValue, SourceLocation());
UnaryOperator *SRC = UnaryOperator::Create(
    C, &SrcExpr, UO_Deref, SrcTy->getPointeeType(), VK_LValue, OK_Ordinary,
    SourceLocation(), false, FPOptionsOverride());

Expr *Args[2] = {DST, SRC};
CallExpr *CalleeExp = cast<CallExpr>(PID->getSetterCXXAssignment());
CXXOperatorCallExpr *TheCall = CXXOperatorCallExpr::Create(
    C, OO_Equal, CalleeExp->getCallee(), Args, DestTy->getPointeeType(),
    VK_LValue, SourceLocation(), FPOptionsOverride());

EmitStmt(TheCall);

FinishFunction();
HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
CGM.setAtomicSetterHelperFnMap(Ty, HelperFn);
return HelperFn;
3752}

3754llvm::Constant *
3755CodeGenFunction::GenerateObjCAtomicGetterCopyHelperFunction(
                                          const ObjCPropertyImplDecl *PID) {
if (!getLangOpts().CPlusPlus ||
    !getLangOpts().ObjCRuntime.hasAtomicCopyHelper())
  return nullptr;
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
QualType Ty = PD->getType();
if (!Ty->isRecordType())
  return nullptr;
if ((!(PD->getPropertyAttributes() & ObjCPropertyAttribute::kind_atomic)))
  return nullptr;
llvm::Constant *HelperFn = nullptr;
if (hasTrivialGetExpr(PID))
  return nullptr;
assert(PID->getGetterCXXConstructor() && "getGetterCXXConstructor - null")((void)0);
if ((HelperFn = CGM.getAtomicGetterHelperFnMap(Ty)))
  return HelperFn;

ASTContext &C = getContext();
IdentifierInfo *II =
    &CGM.getContext().Idents.get("__copy_helper_atomic_property_");

QualType ReturnTy = C.VoidTy;
QualType DestTy = C.getPointerType(Ty);
QualType SrcTy = Ty;
SrcTy.addConst();
SrcTy = C.getPointerType(SrcTy);

SmallVector<QualType, 2> ArgTys;
ArgTys.push_back(DestTy);
ArgTys.push_back(SrcTy);
QualType FunctionTy = C.getFunctionType(ReturnTy, ArgTys, {});

FunctionDecl *FD = FunctionDecl::Create(
    C, C.getTranslationUnitDecl(), SourceLocation(), SourceLocation(), II,
    FunctionTy, nullptr, SC_Static, false, false);

FunctionArgList args;
ParmVarDecl *Params[2];
ParmVarDecl *DstDecl = ParmVarDecl::Create(
    C, FD, SourceLocation(), SourceLocation(), nullptr, DestTy,
    C.getTrivialTypeSourceInfo(DestTy, SourceLocation()), SC_None,
    /*DefArg=*/nullptr);
args.push_back(Params[0] = DstDecl);
ParmVarDecl *SrcDecl = ParmVarDecl::Create(
    C, FD, SourceLocation(), SourceLocation(), nullptr, SrcTy,
    C.getTrivialTypeSourceInfo(SrcTy, SourceLocation()), SC_None,
    /*DefArg=*/nullptr);
args.push_back(Params[1] = SrcDecl);
FD->setParams(Params);

const CGFunctionInfo &FI =
    CGM.getTypes().arrangeBuiltinFunctionDeclaration(ReturnTy, args);

llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);

llvm::Function *Fn = llvm::Function::Create(
    LTy, llvm::GlobalValue::InternalLinkage, "__copy_helper_atomic_property_",
    &CGM.getModule());

CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, FI);

StartFunction(FD, ReturnTy, Fn, FI, args);

DeclRefExpr SrcExpr(getContext(), SrcDecl, false, SrcTy, VK_PRValue,
                    SourceLocation());

UnaryOperator *SRC = UnaryOperator::Create(
    C, &SrcExpr, UO_Deref, SrcTy->getPointeeType(), VK_LValue, OK_Ordinary,
    SourceLocation(), false, FPOptionsOverride());

CXXConstructExpr *CXXConstExpr =
  cast<CXXConstructExpr>(PID->getGetterCXXConstructor());

SmallVector<Expr*, 4> ConstructorArgs;
ConstructorArgs.push_back(SRC);
ConstructorArgs.append(std::next(CXXConstExpr->arg_begin()),
                       CXXConstExpr->arg_end());

CXXConstructExpr *TheCXXConstructExpr =
  CXXConstructExpr::Create(C, Ty, SourceLocation(),
                           CXXConstExpr->getConstructor(),
                           CXXConstExpr->isElidable(),
                           ConstructorArgs,
                           CXXConstExpr->hadMultipleCandidates(),
                           CXXConstExpr->isListInitialization(),
                           CXXConstExpr->isStdInitListInitialization(),
                           CXXConstExpr->requiresZeroInitialization(),
                           CXXConstExpr->getConstructionKind(),
                           SourceRange());

DeclRefExpr DstExpr(getContext(), DstDecl, false, DestTy, VK_PRValue,
                    SourceLocation());

RValue DV = EmitAnyExpr(&DstExpr);
CharUnits Alignment
  = getContext().getTypeAlignInChars(TheCXXConstructExpr->getType());
EmitAggExpr(TheCXXConstructExpr,
            AggValueSlot::forAddr(Address(DV.getScalarVal(), Alignment),
                                  Qualifiers(),
                                  AggValueSlot::IsDestructed,
                                  AggValueSlot::DoesNotNeedGCBarriers,
                                  AggValueSlot::IsNotAliased,
                                  AggValueSlot::DoesNotOverlap));

FinishFunction();
HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
CGM.setAtomicGetterHelperFnMap(Ty, HelperFn);
return HelperFn;
3864}

3866llvm::Value *
3867CodeGenFunction::EmitBlockCopyAndAutorelease(llvm::Value *Block, QualType Ty) {
// Get selectors for retain/autorelease.
IdentifierInfo *CopyID = &getContext().Idents.get("copy");
Selector CopySelector =
    getContext().Selectors.getNullarySelector(CopyID);
IdentifierInfo *AutoreleaseID = &getContext().Idents.get("autorelease");
Selector AutoreleaseSelector =
    getContext().Selectors.getNullarySelector(AutoreleaseID);

// Emit calls to retain/autorelease.
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
llvm::Value *Val = Block;
RValue Result;
Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
                                     Ty, CopySelector,
                                     Val, CallArgList(), nullptr, nullptr);
Val = Result.getScalarVal();
Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
                                     Ty, AutoreleaseSelector,
                                     Val, CallArgList(), nullptr, nullptr);
Val = Result.getScalarVal();
return Val;
3889}

3891static unsigned getBaseMachOPlatformID(const llvm::Triple &TT) {
switch (TT.getOS()) {
case llvm::Triple::Darwin:
case llvm::Triple::MacOSX:
  return llvm::MachO::PLATFORM_MACOS;
case llvm::Triple::IOS:
  return llvm::MachO::PLATFORM_IOS;
case llvm::Triple::TvOS:
  return llvm::MachO::PLATFORM_TVOS;
case llvm::Triple::WatchOS:
  return llvm::MachO::PLATFORM_WATCHOS;
default:
  return /*Unknown platform*/ 0;
}
3905}

3907static llvm::Value *emitIsPlatformVersionAtLeast(CodeGenFunction &CGF,
                                               const VersionTuple &Version) {
CodeGenModule &CGM = CGF.CGM;
// Note: we intend to support multi-platform version checks, so reserve
// the room for a dual platform checking invocation that will be
// implemented in the future.
llvm::SmallVector<llvm::Value *, 8> Args;

auto EmitArgs = [&](const VersionTuple &Version, const llvm::Triple &TT) {
  Optional<unsigned> Min = Version.getMinor(), SMin = Version.getSubminor();
  Args.push_back(
      llvm::ConstantInt::get(CGM.Int32Ty, getBaseMachOPlatformID(TT)));
  Args.push_back(llvm::ConstantInt::get(CGM.Int32Ty, Version.getMajor()));
  Args.push_back(llvm::ConstantInt::get(CGM.Int32Ty, Min ? *Min : 0));
  Args.push_back(llvm::ConstantInt::get(CGM.Int32Ty, SMin ? *SMin : 0));
};

assert(!Version.empty() && "unexpected empty version")((void)0);
EmitArgs(Version, CGM.getTarget().getTriple());

if (!CGM.IsPlatformVersionAtLeastFn) {
  llvm::FunctionType *FTy = llvm::FunctionType::get(
      CGM.Int32Ty, {CGM.Int32Ty, CGM.Int32Ty, CGM.Int32Ty, CGM.Int32Ty},
      false);
  CGM.IsPlatformVersionAtLeastFn =
      CGM.CreateRuntimeFunction(FTy, "__isPlatformVersionAtLeast");
}

llvm::Value *Check =
    CGF.EmitNounwindRuntimeCall(CGM.IsPlatformVersionAtLeastFn, Args);
return CGF.Builder.CreateICmpNE(Check,
                                llvm::Constant::getNullValue(CGM.Int32Ty));
3939}

3941llvm::Value *
3942CodeGenFunction::EmitBuiltinAvailable(const VersionTuple &Version) {
// Darwin uses the new __isPlatformVersionAtLeast family of routines.
if (CGM.getTarget().getTriple().isOSDarwin())
  return emitIsPlatformVersionAtLeast(*this, Version);

if (!CGM.IsOSVersionAtLeastFn) {
  llvm::FunctionType *FTy =
      llvm::FunctionType::get(Int32Ty, {Int32Ty, Int32Ty, Int32Ty}, false);
  CGM.IsOSVersionAtLeastFn =
      CGM.CreateRuntimeFunction(FTy, "__isOSVersionAtLeast");
}

Optional<unsigned> Min = Version.getMinor(), SMin = Version.getSubminor();
llvm::Value *Args[] = {
    llvm::ConstantInt::get(CGM.Int32Ty, Version.getMajor()),
    llvm::ConstantInt::get(CGM.Int32Ty, Min ? *Min : 0),
    llvm::ConstantInt::get(CGM.Int32Ty, SMin ? *SMin : 0),
};

llvm::Value *CallRes =
    EmitNounwindRuntimeCall(CGM.IsOSVersionAtLeastFn, Args);

return Builder.CreateICmpNE(CallRes, llvm::Constant::getNullValue(Int32Ty));
3965}

3967static bool isFoundationNeededForDarwinAvailabilityCheck(
  const llvm::Triple &TT, const VersionTuple &TargetVersion) {
VersionTuple FoundationDroppedInVersion;
switch (TT.getOS()) {
case llvm::Triple::IOS:
case llvm::Triple::TvOS:
  FoundationDroppedInVersion = VersionTuple(/*Major=*/13);
  break;
case llvm::Triple::WatchOS:
  FoundationDroppedInVersion = VersionTuple(/*Major=*/6);
  break;
case llvm::Triple::Darwin:
case llvm::Triple::MacOSX:
  FoundationDroppedInVersion = VersionTuple(/*Major=*/10, /*Minor=*/15);
  break;
default:
  llvm_unreachable("Unexpected OS")__builtin_unreachable();
}
return TargetVersion < FoundationDroppedInVersion;
3986}

3988void CodeGenModule::emitAtAvailableLinkGuard() {
if (!IsPlatformVersionAtLeastFn)
  return;
// @available requires CoreFoundation only on Darwin.
if (!Target.getTriple().isOSDarwin())
  return;
// @available doesn't need Foundation on macOS 10.15+, iOS/tvOS 13+, or
// watchOS 6+.
if (!isFoundationNeededForDarwinAvailabilityCheck(
        Target.getTriple(), Target.getPlatformMinVersion()))
  return;
// Add -framework CoreFoundation to the linker commands. We still want to
// emit the core foundation reference down below because otherwise if
// CoreFoundation is not used in the code, the linker won't link the
// framework.
auto &Context = getLLVMContext();
llvm::Metadata *Args[2] = {llvm::MDString::get(Context, "-framework"),
                           llvm::MDString::get(Context, "CoreFoundation")};
LinkerOptionsMetadata.push_back(llvm::MDNode::get(Context, Args));
// Emit a reference to a symbol from CoreFoundation to ensure that
// CoreFoundation is linked into the final binary.
llvm::FunctionType *FTy =
    llvm::FunctionType::get(Int32Ty, {VoidPtrTy}, false);
llvm::FunctionCallee CFFunc =
    CreateRuntimeFunction(FTy, "CFBundleGetVersionNumber");

llvm::FunctionType *CheckFTy = llvm::FunctionType::get(VoidTy, {}, false);
llvm::FunctionCallee CFLinkCheckFuncRef = CreateRuntimeFunction(
    CheckFTy, "__clang_at_available_requires_core_foundation_framework",
    llvm::AttributeList(), /*Local=*/true);
llvm::Function *CFLinkCheckFunc =
    cast<llvm::Function>(CFLinkCheckFuncRef.getCallee()->stripPointerCasts());
if (CFLinkCheckFunc->empty()) {
  CFLinkCheckFunc->setLinkage(llvm::GlobalValue::LinkOnceAnyLinkage);
  CFLinkCheckFunc->setVisibility(llvm::GlobalValue::HiddenVisibility);
  CodeGenFunction CGF(*this);
  CGF.Builder.SetInsertPoint(CGF.createBasicBlock("", CFLinkCheckFunc));
  CGF.EmitNounwindRuntimeCall(CFFunc,
                              llvm::Constant::getNullValue(VoidPtrTy));
  CGF.Builder.CreateUnreachable();
  addCompilerUsedGlobal(CFLinkCheckFunc);
}
4030}

4032CGObjCRuntime::~CGObjCRuntime() {}