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

Bug Summary

File:	src/gnu/usr.bin/clang/libclangCodeGen/../../../llvm/clang/lib/CodeGen/CGDebugInfo.cpp
Warning:	line 1595, column 19 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGDebugInfo.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/CGDebugInfo.cpp
1//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
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 coordinates the debug information generation while generating code.
10//
11//===----------------------------------------------------------------------===//

13#include "CGDebugInfo.h"
14#include "CGBlocks.h"
15#include "CGCXXABI.h"
16#include "CGObjCRuntime.h"
17#include "CGRecordLayout.h"
18#include "CodeGenFunction.h"
19#include "CodeGenModule.h"
20#include "ConstantEmitter.h"
21#include "clang/AST/ASTContext.h"
22#include "clang/AST/Attr.h"
23#include "clang/AST/DeclFriend.h"
24#include "clang/AST/DeclObjC.h"
25#include "clang/AST/DeclTemplate.h"
26#include "clang/AST/Expr.h"
27#include "clang/AST/RecordLayout.h"
28#include "clang/Basic/CodeGenOptions.h"
29#include "clang/Basic/FileManager.h"
30#include "clang/Basic/SourceManager.h"
31#include "clang/Basic/Version.h"
32#include "clang/Frontend/FrontendOptions.h"
33#include "clang/Lex/HeaderSearchOptions.h"
34#include "clang/Lex/ModuleMap.h"
35#include "clang/Lex/PreprocessorOptions.h"
36#include "llvm/ADT/DenseSet.h"
37#include "llvm/ADT/SmallVector.h"
38#include "llvm/ADT/StringExtras.h"
39#include "llvm/IR/Constants.h"
40#include "llvm/IR/DataLayout.h"
41#include "llvm/IR/DerivedTypes.h"
42#include "llvm/IR/Instructions.h"
43#include "llvm/IR/Intrinsics.h"
44#include "llvm/IR/Metadata.h"
45#include "llvm/IR/Module.h"
46#include "llvm/Support/FileSystem.h"
47#include "llvm/Support/MD5.h"
48#include "llvm/Support/Path.h"
49#include "llvm/Support/TimeProfiler.h"
50using namespace clang;
51using namespace clang::CodeGen;

53static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
auto TI = Ctx.getTypeInfo(Ty);
return TI.AlignIsRequired ? TI.Align : 0;
56}

58static uint32_t getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
60}

62static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
64}

66CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
  : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
    DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
    DBuilder(CGM.getModule()) {
for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
  DebugPrefixMap[KV.first] = KV.second;
CreateCompileUnit();
73}

75CGDebugInfo::~CGDebugInfo() {
assert(LexicalBlockStack.empty() &&((void)0)
       "Region stack mismatch, stack not empty!")((void)0);
78}

80ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
                                     SourceLocation TemporaryLocation)
  : CGF(&CGF) {
init(TemporaryLocation);
84}

86ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
                                     bool DefaultToEmpty,
                                     SourceLocation TemporaryLocation)
  : CGF(&CGF) {
init(TemporaryLocation, DefaultToEmpty);
91}

93void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
                            bool DefaultToEmpty) {
auto *DI = CGF->getDebugInfo();
if (!DI) {
  CGF = nullptr;
  return;
}

OriginalLocation = CGF->Builder.getCurrentDebugLocation();

if (OriginalLocation && !DI->CGM.getExpressionLocationsEnabled())
  return;

if (TemporaryLocation.isValid()) {
  DI->EmitLocation(CGF->Builder, TemporaryLocation);
  return;
}

if (DefaultToEmpty) {
  CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
  return;
}

// Construct a location that has a valid scope, but no line info.
assert(!DI->LexicalBlockStack.empty())((void)0);
CGF->Builder.SetCurrentDebugLocation(
    llvm::DILocation::get(DI->LexicalBlockStack.back()->getContext(), 0, 0,
                          DI->LexicalBlockStack.back(), DI->getInlinedAt()));
121}

123ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
  : CGF(&CGF) {
init(E->getExprLoc());
126}

128ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
  : CGF(&CGF) {
if (!CGF.getDebugInfo()) {
  this->CGF = nullptr;
  return;
}
OriginalLocation = CGF.Builder.getCurrentDebugLocation();
if (Loc)
  CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
137}

139ApplyDebugLocation::~ApplyDebugLocation() {
// Query CGF so the location isn't overwritten when location updates are
// temporarily disabled (for C++ default function arguments)
if (CGF)
  CGF->Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
144}

146ApplyInlineDebugLocation::ApplyInlineDebugLocation(CodeGenFunction &CGF,
                                                 GlobalDecl InlinedFn)
  : CGF(&CGF) {
if (!CGF.getDebugInfo()) {
  this->CGF = nullptr;
  return;
}
auto &DI = *CGF.getDebugInfo();
SavedLocation = DI.getLocation();
assert((DI.getInlinedAt() ==((void)0)
        CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) &&((void)0)
       "CGDebugInfo and IRBuilder are out of sync")((void)0);

DI.EmitInlineFunctionStart(CGF.Builder, InlinedFn);
160}

162ApplyInlineDebugLocation::~ApplyInlineDebugLocation() {
if (!CGF)
  return;
auto &DI = *CGF->getDebugInfo();
DI.EmitInlineFunctionEnd(CGF->Builder);
DI.EmitLocation(CGF->Builder, SavedLocation);
168}

170void CGDebugInfo::setLocation(SourceLocation Loc) {
// If the new location isn't valid return.
if (Loc.isInvalid())
  return;

CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);

// If we've changed files in the middle of a lexical scope go ahead
// and create a new lexical scope with file node if it's different
// from the one in the scope.
if (LexicalBlockStack.empty())
  return;

SourceManager &SM = CGM.getContext().getSourceManager();
auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
if (PCLoc.isInvalid() || Scope->getFile() == getOrCreateFile(CurLoc))
  return;

if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
  LexicalBlockStack.pop_back();
  LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
      LBF->getScope(), getOrCreateFile(CurLoc)));
} else if (isa<llvm::DILexicalBlock>(Scope) ||
           isa<llvm::DISubprogram>(Scope)) {
  LexicalBlockStack.pop_back();
  LexicalBlockStack.emplace_back(
      DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
}
199}

201llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
llvm::DIScope *Mod = getParentModuleOrNull(D);
return getContextDescriptor(cast<Decl>(D->getDeclContext()),
                            Mod ? Mod : TheCU);
205}

207llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context,
                                               llvm::DIScope *Default) {
if (!Context)
  return Default;

auto I = RegionMap.find(Context);
if (I != RegionMap.end()) {
  llvm::Metadata *V = I->second;
  return dyn_cast_or_null<llvm::DIScope>(V);
}

// Check namespace.
if (const auto *NSDecl = dyn_cast<NamespaceDecl>(Context))
  return getOrCreateNamespace(NSDecl);

if (const auto *RDecl = dyn_cast<RecordDecl>(Context))
  if (!RDecl->isDependentType())
    return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
                           TheCU->getFile());
return Default;
227}

229PrintingPolicy CGDebugInfo::getPrintingPolicy() const {
PrintingPolicy PP = CGM.getContext().getPrintingPolicy();

// If we're emitting codeview, it's important to try to match MSVC's naming so
// that visualizers written for MSVC will trigger for our class names. In
// particular, we can't have spaces between arguments of standard templates
// like basic_string and vector, but we must have spaces between consecutive
// angle brackets that close nested template argument lists.
if (CGM.getCodeGenOpts().EmitCodeView) {
  PP.MSVCFormatting = true;
  PP.SplitTemplateClosers = true;
} else {
  // For DWARF, printing rules are underspecified.
  // SplitTemplateClosers yields better interop with GCC and GDB (PR46052).
  PP.SplitTemplateClosers = true;
}

// Apply -fdebug-prefix-map.
PP.Callbacks = &PrintCB;
return PP;
249}

251StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
return internString(GetName(FD));
253}

255StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
SmallString<256> MethodName;
llvm::raw_svector_ostream OS(MethodName);
OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
const DeclContext *DC = OMD->getDeclContext();
if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {
  OS << OID->getName();
} else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {
  OS << OID->getName();
} else if (const auto *OC = dyn_cast<ObjCCategoryDecl>(DC)) {
  if (OC->IsClassExtension()) {
    OS << OC->getClassInterface()->getName();
  } else {
    OS << OC->getIdentifier()->getNameStart() << '('
       << OC->getIdentifier()->getNameStart() << ')';
  }
} else if (const auto *OCD = dyn_cast<ObjCCategoryImplDecl>(DC)) {
  OS << OCD->getClassInterface()->getName() << '(' << OCD->getName() << ')';
}
OS << ' ' << OMD->getSelector().getAsString() << ']';

return internString(OS.str());
277}

279StringRef CGDebugInfo::getSelectorName(Selector S) {
return internString(S.getAsString());
281}

283StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
if (isa<ClassTemplateSpecializationDecl>(RD)) {
  // Copy this name on the side and use its reference.
  return internString(GetName(RD));
}

// quick optimization to avoid having to intern strings that are already
// stored reliably elsewhere
if (const IdentifierInfo *II = RD->getIdentifier())
  return II->getName();

// The CodeView printer in LLVM wants to see the names of unnamed types
// because they need to have a unique identifier.
// These names are used to reconstruct the fully qualified type names.
if (CGM.getCodeGenOpts().EmitCodeView) {
  if (const TypedefNameDecl *D = RD->getTypedefNameForAnonDecl()) {
    assert(RD->getDeclContext() == D->getDeclContext() &&((void)0)
           "Typedef should not be in another decl context!")((void)0);
    assert(D->getDeclName().getAsIdentifierInfo() &&((void)0)
           "Typedef was not named!")((void)0);
    return D->getDeclName().getAsIdentifierInfo()->getName();
  }

  if (CGM.getLangOpts().CPlusPlus) {
    StringRef Name;

    ASTContext &Context = CGM.getContext();
    if (const DeclaratorDecl *DD = Context.getDeclaratorForUnnamedTagDecl(RD))
      // Anonymous types without a name for linkage purposes have their
      // declarator mangled in if they have one.
      Name = DD->getName();
    else if (const TypedefNameDecl *TND =
                 Context.getTypedefNameForUnnamedTagDecl(RD))
      // Anonymous types without a name for linkage purposes have their
      // associate typedef mangled in if they have one.
      Name = TND->getName();

    // Give lambdas a display name based on their name mangling.
    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
      if (CXXRD->isLambda())
        return internString(
            CGM.getCXXABI().getMangleContext().getLambdaString(CXXRD));

    if (!Name.empty()) {
      SmallString<256> UnnamedType("<unnamed-type-");
      UnnamedType += Name;
      UnnamedType += '>';
      return internString(UnnamedType);
    }
  }
}

return StringRef();
336}

338Optional<llvm::DIFile::ChecksumKind>
339CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
Checksum.clear();

if (!CGM.getCodeGenOpts().EmitCodeView &&
    CGM.getCodeGenOpts().DwarfVersion < 5)
  return None;

SourceManager &SM = CGM.getContext().getSourceManager();
Optional<llvm::MemoryBufferRef> MemBuffer = SM.getBufferOrNone(FID);
if (!MemBuffer)
  return None;

llvm::MD5 Hash;
llvm::MD5::MD5Result Result;

Hash.update(MemBuffer->getBuffer());
Hash.final(Result);

Hash.stringifyResult(Result, Checksum);
return llvm::DIFile::CSK_MD5;
359}

361Optional<StringRef> CGDebugInfo::getSource(const SourceManager &SM,
                                         FileID FID) {
if (!CGM.getCodeGenOpts().EmbedSource)
  return None;

bool SourceInvalid = false;
StringRef Source = SM.getBufferData(FID, &SourceInvalid);

if (SourceInvalid)
  return None;

return Source;
373}

375llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
SourceManager &SM = CGM.getContext().getSourceManager();
StringRef FileName;
FileID FID;

if (Loc.isInvalid()) {
  // The DIFile used by the CU is distinct from the main source file. Call
  // createFile() below for canonicalization if the source file was specified
  // with an absolute path.
  FileName = TheCU->getFile()->getFilename();
} else {
  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
  FileName = PLoc.getFilename();
  
  if (FileName.empty()) {
    FileName = TheCU->getFile()->getFilename();
  } else {
    FileName = PLoc.getFilename();
  }
  FID = PLoc.getFileID();
}

// Cache the results.
auto It = DIFileCache.find(FileName.data());
if (It != DIFileCache.end()) {
  // Verify that the information still exists.
  if (llvm::Metadata *V = It->second)
    return cast<llvm::DIFile>(V);
}

SmallString<32> Checksum;

Optional<llvm::DIFile::ChecksumKind> CSKind = computeChecksum(FID, Checksum);
Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;
if (CSKind)
  CSInfo.emplace(*CSKind, Checksum);
return createFile(FileName, CSInfo, getSource(SM, SM.getFileID(Loc)));
412}

414llvm::DIFile *
415CGDebugInfo::createFile(StringRef FileName,
                      Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo,
                      Optional<StringRef> Source) {
StringRef Dir;
StringRef File;
std::string RemappedFile = remapDIPath(FileName);
std::string CurDir = remapDIPath(getCurrentDirname());
SmallString<128> DirBuf;
SmallString<128> FileBuf;
if (llvm::sys::path::is_absolute(RemappedFile)) {
  // Strip the common prefix (if it is more than just "/") from current
  // directory and FileName for a more space-efficient encoding.
  auto FileIt = llvm::sys::path::begin(RemappedFile);
  auto FileE = llvm::sys::path::end(RemappedFile);
  auto CurDirIt = llvm::sys::path::begin(CurDir);
  auto CurDirE = llvm::sys::path::end(CurDir);
  for (; CurDirIt != CurDirE && *CurDirIt == *FileIt; ++CurDirIt, ++FileIt)
    llvm::sys::path::append(DirBuf, *CurDirIt);
  if (std::distance(llvm::sys::path::begin(CurDir), CurDirIt) == 1) {
    // Don't strip the common prefix if it is only the root "/"
    // since that would make LLVM diagnostic locations confusing.
    Dir = {};
    File = RemappedFile;
  } else {
    for (; FileIt != FileE; ++FileIt)
      llvm::sys::path::append(FileBuf, *FileIt);
    Dir = DirBuf;
    File = FileBuf;
  }
} else {
  Dir = CurDir;
  File = RemappedFile;
}
llvm::DIFile *F = DBuilder.createFile(File, Dir, CSInfo, Source);
DIFileCache[FileName.data()].reset(F);
return F;
451}

453std::string CGDebugInfo::remapDIPath(StringRef Path) const {
if (DebugPrefixMap.empty())
  return Path.str();

SmallString<256> P = Path;
for (const auto &Entry : DebugPrefixMap)
  if (llvm::sys::path::replace_path_prefix(P, Entry.first, Entry.second))
    break;
return P.str().str();
462}

464unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
if (Loc.isInvalid())
  return 0;
SourceManager &SM = CGM.getContext().getSourceManager();
return SM.getPresumedLoc(Loc).getLine();
469}

471unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
// We may not want column information at all.
if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
  return 0;

// If the location is invalid then use the current column.
if (Loc.isInvalid() && CurLoc.isInvalid())
  return 0;
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
return PLoc.isValid() ? PLoc.getColumn() : 0;
482}

484StringRef CGDebugInfo::getCurrentDirname() {
if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
  return CGM.getCodeGenOpts().DebugCompilationDir;

if (!CWDName.empty())
  return CWDName;
SmallString<256> CWD;
llvm::sys::fs::current_path(CWD);
return CWDName = internString(CWD);
493}

495void CGDebugInfo::CreateCompileUnit() {
SmallString<32> Checksum;
Optional<llvm::DIFile::ChecksumKind> CSKind;
Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;

// Should we be asking the SourceManager for the main file name, instead of
// accepting it as an argument? This just causes the main file name to
// mismatch with source locations and create extra lexical scopes or
// mismatched debug info (a CU with a DW_AT_file of "-", because that's what
// the driver passed, but functions/other things have DW_AT_file of "<stdin>"
// because that's what the SourceManager says)

// Get absolute path name.
SourceManager &SM = CGM.getContext().getSourceManager();
std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
if (MainFileName.empty())
  MainFileName = "<stdin>";

// The main file name provided via the "-main-file-name" option contains just
// the file name itself with no path information. This file name may have had
// a relative path, so we look into the actual file entry for the main
// file to determine the real absolute path for the file.
std::string MainFileDir;
if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
  MainFileDir = std::string(MainFile->getDir()->getName());
  if (!llvm::sys::path::is_absolute(MainFileName)) {
    llvm::SmallString<1024> MainFileDirSS(MainFileDir);
    llvm::sys::path::append(MainFileDirSS, MainFileName);
    MainFileName =
        std::string(llvm::sys::path::remove_leading_dotslash(MainFileDirSS));
  }
  // If the main file name provided is identical to the input file name, and
  // if the input file is a preprocessed source, use the module name for
  // debug info. The module name comes from the name specified in the first
  // linemarker if the input is a preprocessed source.
  if (MainFile->getName() == MainFileName &&
      FrontendOptions::getInputKindForExtension(
          MainFile->getName().rsplit('.').second)
          .isPreprocessed())
    MainFileName = CGM.getModule().getName().str();

  CSKind = computeChecksum(SM.getMainFileID(), Checksum);
}

llvm::dwarf::SourceLanguage LangTag;
const LangOptions &LO = CGM.getLangOpts();
if (LO.CPlusPlus) {
  if (LO.ObjC)
    LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
  else if (LO.CPlusPlus14 && (!CGM.getCodeGenOpts().DebugStrictDwarf ||
                              CGM.getCodeGenOpts().DwarfVersion >= 5))
    LangTag = llvm::dwarf::DW_LANG_C_plus_plus_14;
  else if (LO.CPlusPlus11 && (!CGM.getCodeGenOpts().DebugStrictDwarf ||
                              CGM.getCodeGenOpts().DwarfVersion >= 5))
    LangTag = llvm::dwarf::DW_LANG_C_plus_plus_11;
  else
    LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
} else if (LO.ObjC) {
  LangTag = llvm::dwarf::DW_LANG_ObjC;
} else if (LO.OpenCL && (!CGM.getCodeGenOpts().DebugStrictDwarf ||
                         CGM.getCodeGenOpts().DwarfVersion >= 5)) {
  LangTag = llvm::dwarf::DW_LANG_OpenCL;
} else if (LO.RenderScript) {
  LangTag = llvm::dwarf::DW_LANG_GOOGLE_RenderScript;
} else if (LO.C99) {
  LangTag = llvm::dwarf::DW_LANG_C99;
} else {
  LangTag = llvm::dwarf::DW_LANG_C89;
}

std::string Producer = getClangFullVersion();

// Figure out which version of the ObjC runtime we have.
unsigned RuntimeVers = 0;
if (LO.ObjC)
  RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;

llvm::DICompileUnit::DebugEmissionKind EmissionKind;
switch (DebugKind) {
case codegenoptions::NoDebugInfo:
case codegenoptions::LocTrackingOnly:
  EmissionKind = llvm::DICompileUnit::NoDebug;
  break;
case codegenoptions::DebugLineTablesOnly:
  EmissionKind = llvm::DICompileUnit::LineTablesOnly;
  break;
case codegenoptions::DebugDirectivesOnly:
  EmissionKind = llvm::DICompileUnit::DebugDirectivesOnly;
  break;
case codegenoptions::DebugInfoConstructor:
case codegenoptions::LimitedDebugInfo:
case codegenoptions::FullDebugInfo:
case codegenoptions::UnusedTypeInfo:
  EmissionKind = llvm::DICompileUnit::FullDebug;
  break;
}

uint64_t DwoId = 0;
auto &CGOpts = CGM.getCodeGenOpts();
// The DIFile used by the CU is distinct from the main source
// file. Its directory part specifies what becomes the
// DW_AT_comp_dir (the compilation directory), even if the source
// file was specified with an absolute path.
if (CSKind)
  CSInfo.emplace(*CSKind, Checksum);
llvm::DIFile *CUFile = DBuilder.createFile(
    remapDIPath(MainFileName), remapDIPath(getCurrentDirname()), CSInfo,
    getSource(SM, SM.getMainFileID()));

StringRef Sysroot, SDK;
if (CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::LLDB) {
  Sysroot = CGM.getHeaderSearchOpts().Sysroot;
  auto B = llvm::sys::path::rbegin(Sysroot);
  auto E = llvm::sys::path::rend(Sysroot);
  auto It = std::find_if(B, E, [](auto SDK) { return SDK.endswith(".sdk"); });
  if (It != E)
    SDK = *It;
}

// Create new compile unit.
TheCU = DBuilder.createCompileUnit(
    LangTag, CUFile, CGOpts.EmitVersionIdentMetadata ? Producer : "",
    LO.Optimize || CGOpts.PrepareForLTO || CGOpts.PrepareForThinLTO,
    CGOpts.DwarfDebugFlags, RuntimeVers, CGOpts.SplitDwarfFile, EmissionKind,
    DwoId, CGOpts.SplitDwarfInlining, CGOpts.DebugInfoForProfiling,
    CGM.getTarget().getTriple().isNVPTX()
        ? llvm::DICompileUnit::DebugNameTableKind::None
        : static_cast<llvm::DICompileUnit::DebugNameTableKind>(
              CGOpts.DebugNameTable),
    CGOpts.DebugRangesBaseAddress, remapDIPath(Sysroot), SDK);
625}

627llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
llvm::dwarf::TypeKind Encoding;
StringRef BTName;
switch (BT->getKind()) {
631#define BUILTIN_TYPE(Id, SingletonId)
632#define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
633#include "clang/AST/BuiltinTypes.def"
case BuiltinType::Dependent:
  llvm_unreachable("Unexpected builtin type")__builtin_unreachable();
case BuiltinType::NullPtr:
  return DBuilder.createNullPtrType();
case BuiltinType::Void:
  return nullptr;
case BuiltinType::ObjCClass:
  if (!ClassTy)
    ClassTy =
        DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
                                   "objc_class", TheCU, TheCU->getFile(), 0);
  return ClassTy;
case BuiltinType::ObjCId: {
  // typedef struct objc_class *Class;
  // typedef struct objc_object {
  //  Class isa;
  // } *id;

  if (ObjTy)
    return ObjTy;

  if (!ClassTy)
    ClassTy =
        DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
                                   "objc_class", TheCU, TheCU->getFile(), 0);

  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);

  auto *ISATy = DBuilder.createPointerType(ClassTy, Size);

  ObjTy = DBuilder.createStructType(TheCU, "objc_object", TheCU->getFile(), 0,
                                    0, 0, llvm::DINode::FlagZero, nullptr,
                                    llvm::DINodeArray());

  DBuilder.replaceArrays(
      ObjTy, DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
                 ObjTy, "isa", TheCU->getFile(), 0, Size, 0, 0,
                 llvm::DINode::FlagZero, ISATy)));
  return ObjTy;
}
case BuiltinType::ObjCSel: {
  if (!SelTy)
    SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
                                       "objc_selector", TheCU,
                                       TheCU->getFile(), 0);
  return SelTy;
}

682#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix)                   \
case BuiltinType::Id:                                                        \
  return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t",       \
                                  SingletonId);
686#include "clang/Basic/OpenCLImageTypes.def"
case BuiltinType::OCLSampler:
  return getOrCreateStructPtrType("opencl_sampler_t", OCLSamplerDITy);
case BuiltinType::OCLEvent:
  return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
case BuiltinType::OCLClkEvent:
  return getOrCreateStructPtrType("opencl_clk_event_t", OCLClkEventDITy);
case BuiltinType::OCLQueue:
  return getOrCreateStructPtrType("opencl_queue_t", OCLQueueDITy);
case BuiltinType::OCLReserveID:
  return getOrCreateStructPtrType("opencl_reserve_id_t", OCLReserveIDDITy);
697#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id: \
  return getOrCreateStructPtrType("opencl_" #ExtType, Id##Ty);
700#include "clang/Basic/OpenCLExtensionTypes.def"

702#define SVE_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
703#include "clang/Basic/AArch64SVEACLETypes.def"
  {
    ASTContext::BuiltinVectorTypeInfo Info =
        CGM.getContext().getBuiltinVectorTypeInfo(BT);
    unsigned NumElemsPerVG = (Info.EC.getKnownMinValue() * Info.NumVectors) / 2;

    // Debuggers can't extract 1bit from a vector, so will display a
    // bitpattern for svbool_t instead.
    if (Info.ElementType == CGM.getContext().BoolTy) {
      NumElemsPerVG /= 8;
      Info.ElementType = CGM.getContext().UnsignedCharTy;
    }

    auto *LowerBound =
        llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
            llvm::Type::getInt64Ty(CGM.getLLVMContext()), 0));
    SmallVector<int64_t, 9> Expr(
        {llvm::dwarf::DW_OP_constu, NumElemsPerVG, llvm::dwarf::DW_OP_bregx,
         /* AArch64::VG */ 46, 0, llvm::dwarf::DW_OP_mul,
         llvm::dwarf::DW_OP_constu, 1, llvm::dwarf::DW_OP_minus});
    auto *UpperBound = DBuilder.createExpression(Expr);

    llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(
        /*count*/ nullptr, LowerBound, UpperBound, /*stride*/ nullptr);
    llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
    llvm::DIType *ElemTy =
        getOrCreateType(Info.ElementType, TheCU->getFile());
    auto Align = getTypeAlignIfRequired(BT, CGM.getContext());
    return DBuilder.createVectorType(/*Size*/ 0, Align, ElemTy,
                                     SubscriptArray);
  }
// It doesn't make sense to generate debug info for PowerPC MMA vector types.
// So we return a safe type here to avoid generating an error.
736#define PPC_VECTOR_TYPE(Name, Id, size) \
case BuiltinType::Id:
738#include "clang/Basic/PPCTypes.def"
  return CreateType(cast<const BuiltinType>(CGM.getContext().IntTy));

741#define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
742#include "clang/Basic/RISCVVTypes.def"
  {
    ASTContext::BuiltinVectorTypeInfo Info =
        CGM.getContext().getBuiltinVectorTypeInfo(BT);

    unsigned ElementCount = Info.EC.getKnownMinValue();
    unsigned SEW = CGM.getContext().getTypeSize(Info.ElementType);

    bool Fractional = false;
    unsigned LMUL;
    unsigned FixedSize = ElementCount * SEW;
    if (Info.ElementType == CGM.getContext().BoolTy) {
      // Mask type only occupies one vector register.
      LMUL = 1;
    } else if (FixedSize < 64) {
      // In RVV scalable vector types, we encode 64 bits in the fixed part.
      Fractional = true;
      LMUL = 64 / FixedSize;
    } else {
      LMUL = FixedSize / 64;
    }

    // Element count = (VLENB / SEW) x LMUL
    SmallVector<int64_t, 9> Expr(
        // The DW_OP_bregx operation has two operands: a register which is
        // specified by an unsigned LEB128 number, followed by a signed LEB128
        // offset.
        {llvm::dwarf::DW_OP_bregx, // Read the contents of a register.
         4096 + 0xC22,             // RISC-V VLENB CSR register.
         0, // Offset for DW_OP_bregx. It is dummy here.
         llvm::dwarf::DW_OP_constu,
         SEW / 8, // SEW is in bits.
         llvm::dwarf::DW_OP_div, llvm::dwarf::DW_OP_constu, LMUL});
    if (Fractional)
      Expr.push_back(llvm::dwarf::DW_OP_div);
    else
      Expr.push_back(llvm::dwarf::DW_OP_mul);

    auto *LowerBound =
        llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
            llvm::Type::getInt64Ty(CGM.getLLVMContext()), 0));
    auto *UpperBound = DBuilder.createExpression(Expr);
    llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(
        /*count*/ nullptr, LowerBound, UpperBound, /*stride*/ nullptr);
    llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
    llvm::DIType *ElemTy =
        getOrCreateType(Info.ElementType, TheCU->getFile());

    auto Align = getTypeAlignIfRequired(BT, CGM.getContext());
    return DBuilder.createVectorType(/*Size=*/0, Align, ElemTy,
                                     SubscriptArray);
  }
case BuiltinType::UChar:
case BuiltinType::Char_U:
  Encoding = llvm::dwarf::DW_ATE_unsigned_char;
  break;
case BuiltinType::Char_S:
case BuiltinType::SChar:
  Encoding = llvm::dwarf::DW_ATE_signed_char;
  break;
case BuiltinType::Char8:
case BuiltinType::Char16:
case BuiltinType::Char32:
  Encoding = llvm::dwarf::DW_ATE_UTF;
  break;
case BuiltinType::UShort:
case BuiltinType::UInt:
case BuiltinType::UInt128:
case BuiltinType::ULong:
case BuiltinType::WChar_U:
case BuiltinType::ULongLong:
  Encoding = llvm::dwarf::DW_ATE_unsigned;
  break;
case BuiltinType::Short:
case BuiltinType::Int:
case BuiltinType::Int128:
case BuiltinType::Long:
case BuiltinType::WChar_S:
case BuiltinType::LongLong:
  Encoding = llvm::dwarf::DW_ATE_signed;
  break;
case BuiltinType::Bool:
  Encoding = llvm::dwarf::DW_ATE_boolean;
  break;
case BuiltinType::Half:
case BuiltinType::Float:
case BuiltinType::LongDouble:
case BuiltinType::Float16:
case BuiltinType::BFloat16:
case BuiltinType::Float128:
case BuiltinType::Double:
  // FIXME: For targets where long double and __float128 have the same size,
  // they are currently indistinguishable in the debugger without some
  // special treatment. However, there is currently no consensus on encoding
  // and this should be updated once a DWARF encoding exists for distinct
  // floating point types of the same size.
  Encoding = llvm::dwarf::DW_ATE_float;
  break;
case BuiltinType::ShortAccum:
case BuiltinType::Accum:
case BuiltinType::LongAccum:
case BuiltinType::ShortFract:
case BuiltinType::Fract:
case BuiltinType::LongFract:
case BuiltinType::SatShortFract:
case BuiltinType::SatFract:
case BuiltinType::SatLongFract:
case BuiltinType::SatShortAccum:
case BuiltinType::SatAccum:
case BuiltinType::SatLongAccum:
  Encoding = llvm::dwarf::DW_ATE_signed_fixed;
  break;
case BuiltinType::UShortAccum:
case BuiltinType::UAccum:
case BuiltinType::ULongAccum:
case BuiltinType::UShortFract:
case BuiltinType::UFract:
case BuiltinType::ULongFract:
case BuiltinType::SatUShortAccum:
case BuiltinType::SatUAccum:
case BuiltinType::SatULongAccum:
case BuiltinType::SatUShortFract:
case BuiltinType::SatUFract:
case BuiltinType::SatULongFract:
  Encoding = llvm::dwarf::DW_ATE_unsigned_fixed;
  break;
}

switch (BT->getKind()) {
case BuiltinType::Long:
  BTName = "long int";
  break;
case BuiltinType::LongLong:
  BTName = "long long int";
  break;
case BuiltinType::ULong:
  BTName = "long unsigned int";
  break;
case BuiltinType::ULongLong:
  BTName = "long long unsigned int";
  break;
default:
  BTName = BT->getName(CGM.getLangOpts());
  break;
}
// Bit size and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(BT);
return DBuilder.createBasicType(BTName, Size, Encoding);
890}

892llvm::DIType *CGDebugInfo::CreateType(const AutoType *Ty) {
return DBuilder.createUnspecifiedType("auto");
894}

896llvm::DIType *CGDebugInfo::CreateType(const ExtIntType *Ty) {

StringRef Name = Ty->isUnsigned() ? "unsigned _ExtInt" : "_ExtInt";
llvm::dwarf::TypeKind Encoding = Ty->isUnsigned()
                                     ? llvm::dwarf::DW_ATE_unsigned
                                     : llvm::dwarf::DW_ATE_signed;

return DBuilder.createBasicType(Name, CGM.getContext().getTypeSize(Ty),
                                Encoding);
905}

907llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
// Bit size and offset of the type.
llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
if (Ty->isComplexIntegerType())
  Encoding = llvm::dwarf::DW_ATE_lo_user;

uint64_t Size = CGM.getContext().getTypeSize(Ty);
return DBuilder.createBasicType("complex", Size, Encoding);
915}

917llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
                                             llvm::DIFile *Unit) {
QualifierCollector Qc;
const Type *T = Qc.strip(Ty);

// Ignore these qualifiers for now.
Qc.removeObjCGCAttr();
Qc.removeAddressSpace();
Qc.removeObjCLifetime();

// We will create one Derived type for one qualifier and recurse to handle any
// additional ones.
llvm::dwarf::Tag Tag;
if (Qc.hasConst()) {
  Tag = llvm::dwarf::DW_TAG_const_type;
  Qc.removeConst();
} else if (Qc.hasVolatile()) {
  Tag = llvm::dwarf::DW_TAG_volatile_type;
  Qc.removeVolatile();
} else if (Qc.hasRestrict()) {
  Tag = llvm::dwarf::DW_TAG_restrict_type;
  Qc.removeRestrict();
} else {
  assert(Qc.empty() && "Unknown type qualifier for debug info")((void)0);
  return getOrCreateType(QualType(T, 0), Unit);
}

auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);

// No need to fill in the Name, Line, Size, Alignment, Offset in case of
// CVR derived types.
return DBuilder.createQualifiedType(Tag, FromTy);
949}

951llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
                                    llvm::DIFile *Unit) {

// The frontend treats 'id' as a typedef to an ObjCObjectType,
// whereas 'id<protocol>' is treated as an ObjCPointerType. For the
// debug info, we want to emit 'id' in both cases.
if (Ty->isObjCQualifiedIdType())
  return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);

return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
                             Ty->getPointeeType(), Unit);
962}

964llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
                                    llvm::DIFile *Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
                             Ty->getPointeeType(), Unit);
968}

970/// \return whether a C++ mangling exists for the type defined by TD.
971static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
switch (TheCU->getSourceLanguage()) {
case llvm::dwarf::DW_LANG_C_plus_plus:
case llvm::dwarf::DW_LANG_C_plus_plus_11:
case llvm::dwarf::DW_LANG_C_plus_plus_14:
  return true;
case llvm::dwarf::DW_LANG_ObjC_plus_plus:
  return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
default:
  return false;
}
982}

984// Determines if the debug info for this tag declaration needs a type
985// identifier. The purpose of the unique identifier is to deduplicate type
986// information for identical types across TUs. Because of the C++ one definition
987// rule (ODR), it is valid to assume that the type is defined the same way in
988// every TU and its debug info is equivalent.
989//
990// C does not have the ODR, and it is common for codebases to contain multiple
991// different definitions of a struct with the same name in different TUs.
992// Therefore, if the type doesn't have a C++ mangling, don't give it an
993// identifer. Type information in C is smaller and simpler than C++ type
994// information, so the increase in debug info size is negligible.
995//
996// If the type is not externally visible, it should be unique to the current TU,
997// and should not need an identifier to participate in type deduplication.
998// However, when emitting CodeView, the format internally uses these
999// unique type name identifers for references between debug info. For example,
1000// the method of a class in an anonymous namespace uses the identifer to refer
1001// to its parent class. The Microsoft C++ ABI attempts to provide unique names
1002// for such types, so when emitting CodeView, always use identifiers for C++
1003// types. This may create problems when attempting to emit CodeView when the MS
1004// C++ ABI is not in use.
1005static bool needsTypeIdentifier(const TagDecl *TD, CodeGenModule &CGM,
                              llvm::DICompileUnit *TheCU) {
// We only add a type identifier for types with C++ name mangling.
if (!hasCXXMangling(TD, TheCU))
  return false;

// Externally visible types with C++ mangling need a type identifier.
if (TD->isExternallyVisible())
  return true;

// CodeView types with C++ mangling need a type identifier.
if (CGM.getCodeGenOpts().EmitCodeView)
  return true;

return false;
1020}

1022// Returns a unique type identifier string if one exists, or an empty string.
1023static SmallString<256> getTypeIdentifier(const TagType *Ty, CodeGenModule &CGM,
                                        llvm::DICompileUnit *TheCU) {
SmallString<256> Identifier;
const TagDecl *TD = Ty->getDecl();

if (!needsTypeIdentifier(TD, CGM, TheCU))
  return Identifier;
if (const auto *RD = dyn_cast<CXXRecordDecl>(TD))
  if (RD->getDefinition())
    if (RD->isDynamicClass() &&
        CGM.getVTableLinkage(RD) == llvm::GlobalValue::ExternalLinkage)
      return Identifier;

// TODO: This is using the RTTI name. Is there a better way to get
// a unique string for a type?
llvm::raw_svector_ostream Out(Identifier);
CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
return Identifier;
1041}

1043/// \return the appropriate DWARF tag for a composite type.
1044static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
llvm::dwarf::Tag Tag;
if (RD->isStruct() || RD->isInterface())
  Tag = llvm::dwarf::DW_TAG_structure_type;
else if (RD->isUnion())
  Tag = llvm::dwarf::DW_TAG_union_type;
else {
  // FIXME: This could be a struct type giving a default visibility different
  // than C++ class type, but needs llvm metadata changes first.
  assert(RD->isClass())((void)0);
  Tag = llvm::dwarf::DW_TAG_class_type;
}
return Tag;
1057}

1059llvm::DICompositeType *
1060CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
                                    llvm::DIScope *Ctx) {
const RecordDecl *RD = Ty->getDecl();
if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
  return cast<llvm::DICompositeType>(T);
llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
const unsigned Line =
    getLineNumber(RD->getLocation().isValid() ? RD->getLocation() : CurLoc);
StringRef RDName = getClassName(RD);

uint64_t Size = 0;
uint32_t Align = 0;

const RecordDecl *D = RD->getDefinition();
if (D && D->isCompleteDefinition())
  Size = CGM.getContext().getTypeSize(Ty);

llvm::DINode::DIFlags Flags = llvm::DINode::FlagFwdDecl;

// Add flag to nontrivial forward declarations. To be consistent with MSVC,
// add the flag if a record has no definition because we don't know whether
// it will be trivial or not.
if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
  if (!CXXRD->hasDefinition() ||
      (CXXRD->hasDefinition() && !CXXRD->isTrivial()))
    Flags |= llvm::DINode::FlagNonTrivial;

// Create the type.
SmallString<256> Identifier;
// Don't include a linkage name in line tables only.
if (CGM.getCodeGenOpts().hasReducedDebugInfo())
  Identifier = getTypeIdentifier(Ty, CGM, TheCU);
llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
    getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align, Flags,
    Identifier);
if (CGM.getCodeGenOpts().DebugFwdTemplateParams)
  if (auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
    DBuilder.replaceArrays(RetTy, llvm::DINodeArray(),
                           CollectCXXTemplateParams(TSpecial, DefUnit));
ReplaceMap.emplace_back(
    std::piecewise_construct, std::make_tuple(Ty),
    std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
return RetTy;
1103}

1105llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
                                               const Type *Ty,
                                               QualType PointeeTy,
                                               llvm::DIFile *Unit) {
// Bit size, align and offset of the type.
// Size is always the size of a pointer. We can't use getTypeSize here
// because that does not return the correct value for references.
unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(PointeeTy);
uint64_t Size = CGM.getTarget().getPointerWidth(AddressSpace);
auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
Optional<unsigned> DWARFAddressSpace =
    CGM.getTarget().getDWARFAddressSpace(AddressSpace);

if (Tag == llvm::dwarf::DW_TAG_reference_type ||
    Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
  return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
                                      Size, Align, DWARFAddressSpace);
else
  return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
                                    Align, DWARFAddressSpace);
1125}

1127llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
                                                  llvm::DIType *&Cache) {
if (Cache)
  return Cache;
Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
                                   TheCU, TheCU->getFile(), 0);
unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
Cache = DBuilder.createPointerType(Cache, Size);
return Cache;
1136}

1138uint64_t CGDebugInfo::collectDefaultElementTypesForBlockPointer(
  const BlockPointerType *Ty, llvm::DIFile *Unit, llvm::DIDerivedType *DescTy,
  unsigned LineNo, SmallVectorImpl<llvm::Metadata *> &EltTys) {
QualType FType;

// Advanced by calls to CreateMemberType in increments of FType, then
// returned as the overall size of the default elements.
uint64_t FieldOffset = 0;

// Blocks in OpenCL have unique constraints which make the standard fields
// redundant while requiring size and align fields for enqueue_kernel. See
// initializeForBlockHeader in CGBlocks.cpp
if (CGM.getLangOpts().OpenCL) {
  FType = CGM.getContext().IntTy;
  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
  EltTys.push_back(CreateMemberType(Unit, FType, "__align", &FieldOffset));
} else {
  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
  FType = CGM.getContext().IntTy;
  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
  FType = CGM.getContext().getPointerType(Ty->getPointeeType());
  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
  uint64_t FieldSize = CGM.getContext().getTypeSize(Ty);
  uint32_t FieldAlign = CGM.getContext().getTypeAlign(Ty);
  EltTys.push_back(DBuilder.createMemberType(
      Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign,
      FieldOffset, llvm::DINode::FlagZero, DescTy));
  FieldOffset += FieldSize;
}

return FieldOffset;
1172}

1174llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
                                    llvm::DIFile *Unit) {
SmallVector<llvm::Metadata *, 8> EltTys;
QualType FType;
uint64_t FieldOffset;
llvm::DINodeArray Elements;

FieldOffset = 0;
FType = CGM.getContext().UnsignedLongTy;
EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));

Elements = DBuilder.getOrCreateArray(EltTys);
EltTys.clear();

llvm::DINode::DIFlags Flags = llvm::DINode::FlagAppleBlock;

auto *EltTy =
    DBuilder.createStructType(Unit, "__block_descriptor", nullptr, 0,
                              FieldOffset, 0, Flags, nullptr, Elements);

// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(Ty);

auto *DescTy = DBuilder.createPointerType(EltTy, Size);

FieldOffset = collectDefaultElementTypesForBlockPointer(Ty, Unit, DescTy,
                                                        0, EltTys);

Elements = DBuilder.getOrCreateArray(EltTys);

// The __block_literal_generic structs are marked with a special
// DW_AT_APPLE_BLOCK attribute and are an implementation detail only
// the debugger needs to know about. To allow type uniquing, emit
// them without a name or a location.
EltTy = DBuilder.createStructType(Unit, "", nullptr, 0, FieldOffset, 0,
                                  Flags, nullptr, Elements);

return DBuilder.createPointerType(EltTy, Size);
1213}

1215llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
                                    llvm::DIFile *Unit) {
assert(Ty->isTypeAlias())((void)0);
llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);

auto *AliasDecl =
    cast<TypeAliasTemplateDecl>(Ty->getTemplateName().getAsTemplateDecl())
        ->getTemplatedDecl();

if (AliasDecl->hasAttr<NoDebugAttr>())
  return Src;

SmallString<128> NS;
llvm::raw_svector_ostream OS(NS);
Ty->getTemplateName().print(OS, getPrintingPolicy(), /*qualified*/ false);
printTemplateArgumentList(OS, Ty->template_arguments(), getPrintingPolicy());

SourceLocation Loc = AliasDecl->getLocation();
return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
                              getLineNumber(Loc),
                              getDeclContextDescriptor(AliasDecl));
1236}

1238llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
                                    llvm::DIFile *Unit) {
llvm::DIType *Underlying =
    getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit);

if (Ty->getDecl()->hasAttr<NoDebugAttr>())
  return Underlying;

// We don't set size information, but do specify where the typedef was
// declared.
SourceLocation Loc = Ty->getDecl()->getLocation();

uint32_t Align = getDeclAlignIfRequired(Ty->getDecl(), CGM.getContext());
// Typedefs are derived from some other type.
return DBuilder.createTypedef(Underlying, Ty->getDecl()->getName(),
                              getOrCreateFile(Loc), getLineNumber(Loc),
                              getDeclContextDescriptor(Ty->getDecl()), Align);
1255}

1257static unsigned getDwarfCC(CallingConv CC) {
switch (CC) {
case CC_C:
  // Avoid emitting DW_AT_calling_convention if the C convention was used.
  return 0;

case CC_X86StdCall:
  return llvm::dwarf::DW_CC_BORLAND_stdcall;
case CC_X86FastCall:
  return llvm::dwarf::DW_CC_BORLAND_msfastcall;
case CC_X86ThisCall:
  return llvm::dwarf::DW_CC_BORLAND_thiscall;
case CC_X86VectorCall:
  return llvm::dwarf::DW_CC_LLVM_vectorcall;
case CC_X86Pascal:
  return llvm::dwarf::DW_CC_BORLAND_pascal;
case CC_Win64:
  return llvm::dwarf::DW_CC_LLVM_Win64;
case CC_X86_64SysV:
  return llvm::dwarf::DW_CC_LLVM_X86_64SysV;
case CC_AAPCS:
case CC_AArch64VectorCall:
  return llvm::dwarf::DW_CC_LLVM_AAPCS;
case CC_AAPCS_VFP:
  return llvm::dwarf::DW_CC_LLVM_AAPCS_VFP;
case CC_IntelOclBicc:
  return llvm::dwarf::DW_CC_LLVM_IntelOclBicc;
case CC_SpirFunction:
  return llvm::dwarf::DW_CC_LLVM_SpirFunction;
case CC_OpenCLKernel:
  return llvm::dwarf::DW_CC_LLVM_OpenCLKernel;
case CC_Swift:
  return llvm::dwarf::DW_CC_LLVM_Swift;
case CC_SwiftAsync:
  // [FIXME: swiftasynccc] Update to SwiftAsync once LLVM support lands.
  return llvm::dwarf::DW_CC_LLVM_Swift;
case CC_PreserveMost:
  return llvm::dwarf::DW_CC_LLVM_PreserveMost;
case CC_PreserveAll:
  return llvm::dwarf::DW_CC_LLVM_PreserveAll;
case CC_X86RegCall:
  return llvm::dwarf::DW_CC_LLVM_X86RegCall;
}
return 0;
1301}

1303llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
                                    llvm::DIFile *Unit) {
SmallVector<llvm::Metadata *, 16> EltTys;

// Add the result type at least.
EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));

// Set up remainder of arguments if there is a prototype.
// otherwise emit it as a variadic function.
if (isa<FunctionNoProtoType>(Ty))
  EltTys.push_back(DBuilder.createUnspecifiedParameter());
else if (const auto *FPT = dyn_cast<FunctionProtoType>(Ty)) {
  for (const QualType &ParamType : FPT->param_types())
    EltTys.push_back(getOrCreateType(ParamType, Unit));
  if (FPT->isVariadic())
    EltTys.push_back(DBuilder.createUnspecifiedParameter());
}

llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
                                     getDwarfCC(Ty->getCallConv()));
1324}

1326/// Convert an AccessSpecifier into the corresponding DINode flag.
1327/// As an optimization, return 0 if the access specifier equals the
1328/// default for the containing type.
1329static llvm::DINode::DIFlags getAccessFlag(AccessSpecifier Access,
                                         const RecordDecl *RD) {
AccessSpecifier Default = clang::AS_none;
if (RD && RD->isClass())
  Default = clang::AS_private;
else if (RD && (RD->isStruct() || RD->isUnion()))
  Default = clang::AS_public;

if (Access == Default)
  return llvm::DINode::FlagZero;

switch (Access) {
case clang::AS_private:
  return llvm::DINode::FlagPrivate;
case clang::AS_protected:
  return llvm::DINode::FlagProtected;
case clang::AS_public:
  return llvm::DINode::FlagPublic;
case clang::AS_none:
  return llvm::DINode::FlagZero;
}
llvm_unreachable("unexpected access enumerator")__builtin_unreachable();
1351}

1353llvm::DIType *CGDebugInfo::createBitFieldType(const FieldDecl *BitFieldDecl,
                                            llvm::DIScope *RecordTy,
                                            const RecordDecl *RD) {
StringRef Name = BitFieldDecl->getName();
QualType Ty = BitFieldDecl->getType();
SourceLocation Loc = BitFieldDecl->getLocation();
llvm::DIFile *VUnit = getOrCreateFile(Loc);
llvm::DIType *DebugType = getOrCreateType(Ty, VUnit);

// Get the location for the field.
llvm::DIFile *File = getOrCreateFile(Loc);
unsigned Line = getLineNumber(Loc);

const CGBitFieldInfo &BitFieldInfo =
    CGM.getTypes().getCGRecordLayout(RD).getBitFieldInfo(BitFieldDecl);
uint64_t SizeInBits = BitFieldInfo.Size;
assert(SizeInBits > 0 && "found named 0-width bitfield")((void)0);
uint64_t StorageOffsetInBits =
    CGM.getContext().toBits(BitFieldInfo.StorageOffset);
uint64_t Offset = BitFieldInfo.Offset;
// The bit offsets for big endian machines are reversed for big
// endian target, compensate for that as the DIDerivedType requires
// un-reversed offsets.
if (CGM.getDataLayout().isBigEndian())
  Offset = BitFieldInfo.StorageSize - BitFieldInfo.Size - Offset;
uint64_t OffsetInBits = StorageOffsetInBits + Offset;
llvm::DINode::DIFlags Flags = getAccessFlag(BitFieldDecl->getAccess(), RD);
return DBuilder.createBitFieldMemberType(
    RecordTy, Name, File, Line, SizeInBits, OffsetInBits, StorageOffsetInBits,
    Flags, DebugType);
1383}

1385llvm::DIType *
1386CGDebugInfo::createFieldType(StringRef name, QualType type, SourceLocation loc,
                           AccessSpecifier AS, uint64_t offsetInBits,
                           uint32_t AlignInBits, llvm::DIFile *tunit,
                           llvm::DIScope *scope, const RecordDecl *RD) {
llvm::DIType *debugType = getOrCreateType(type, tunit);

// Get the location for the field.
llvm::DIFile *file = getOrCreateFile(loc);
const unsigned line = getLineNumber(loc.isValid() ? loc : CurLoc);

uint64_t SizeInBits = 0;
auto Align = AlignInBits;
if (!type->isIncompleteArrayType()) {
  TypeInfo TI = CGM.getContext().getTypeInfo(type);
  SizeInBits = TI.Width;
  if (!Align)
    Align = getTypeAlignIfRequired(type, CGM.getContext());
}

llvm::DINode::DIFlags flags = getAccessFlag(AS, RD);
return DBuilder.createMemberType(scope, name, file, line, SizeInBits, Align,
                                 offsetInBits, flags, debugType);
1408}

1410void CGDebugInfo::CollectRecordLambdaFields(
  const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
  llvm::DIType *RecordTy) {
// For C++11 Lambdas a Field will be the same as a Capture, but the Capture
// has the name and the location of the variable so we should iterate over
// both concurrently.
const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
RecordDecl::field_iterator Field = CXXDecl->field_begin();
unsigned fieldno = 0;
for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
                                           E = CXXDecl->captures_end();
     I != E; ++I, ++Field, ++fieldno) {
  const LambdaCapture &C = *I;
  if (C.capturesVariable()) {
    SourceLocation Loc = C.getLocation();
    assert(!Field->isBitField() && "lambdas don't have bitfield members!")((void)0);
    VarDecl *V = C.getCapturedVar();
    StringRef VName = V->getName();
    llvm::DIFile *VUnit = getOrCreateFile(Loc);
    auto Align = getDeclAlignIfRequired(V, CGM.getContext());
    llvm::DIType *FieldType = createFieldType(
        VName, Field->getType(), Loc, Field->getAccess(),
        layout.getFieldOffset(fieldno), Align, VUnit, RecordTy, CXXDecl);
    elements.push_back(FieldType);
  } else if (C.capturesThis()) {
    // TODO: Need to handle 'this' in some way by probably renaming the
    // this of the lambda class and having a field member of 'this' or
    // by using AT_object_pointer for the function and having that be
    // used as 'this' for semantic references.
    FieldDecl *f = *Field;
    llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
    QualType type = f->getType();
    llvm::DIType *fieldType = createFieldType(
        "this", type, f->getLocation(), f->getAccess(),
        layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);

    elements.push_back(fieldType);
  }
}
1449}

1451llvm::DIDerivedType *
1452CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
                                   const RecordDecl *RD) {
// Create the descriptor for the static variable, with or without
// constant initializers.
Var = Var->getCanonicalDecl();
llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);

unsigned LineNumber = getLineNumber(Var->getLocation());
StringRef VName = Var->getName();
llvm::Constant *C = nullptr;
if (Var->getInit()) {
  const APValue *Value = Var->evaluateValue();
  if (Value) {
    if (Value->isInt())
      C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
    if (Value->isFloat())
      C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
  }
}

llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
    RecordTy, VName, VUnit, LineNumber, VTy, Flags, C, Align);
StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
return GV;
1479}

1481void CGDebugInfo::CollectRecordNormalField(
  const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
  SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
  const RecordDecl *RD) {
StringRef name = field->getName();
QualType type = field->getType();

// Ignore unnamed fields unless they're anonymous structs/unions.
if (name.empty() && !type->isRecordType())
  return;

llvm::DIType *FieldType;
if (field->isBitField()) {
  FieldType = createBitFieldType(field, RecordTy, RD);
} else {
  auto Align = getDeclAlignIfRequired(field, CGM.getContext());
  FieldType =
      createFieldType(name, type, field->getLocation(), field->getAccess(),
                      OffsetInBits, Align, tunit, RecordTy, RD);
}

elements.push_back(FieldType);
1503}

1505void CGDebugInfo::CollectRecordNestedType(
  const TypeDecl *TD, SmallVectorImpl<llvm::Metadata *> &elements) {
QualType Ty = CGM.getContext().getTypeDeclType(TD);
// Injected class names are not considered nested records.
if (isa<InjectedClassNameType>(Ty))
  return;
SourceLocation Loc = TD->getLocation();
llvm::DIType *nestedType = getOrCreateType(Ty, getOrCreateFile(Loc));
elements.push_back(nestedType);
1514}

1516void CGDebugInfo::CollectRecordFields(
  const RecordDecl *record, llvm::DIFile *tunit,
  SmallVectorImpl<llvm::Metadata *> &elements,
  llvm::DICompositeType *RecordTy) {
const auto *CXXDecl = dyn_cast<CXXRecordDecl>(record);

if (CXXDecl && CXXDecl->isLambda())
  CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
else {
  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);

  // Field number for non-static fields.
  unsigned fieldNo = 0;

  // Static and non-static members should appear in the same order as
  // the corresponding declarations in the source program.
  for (const auto *I : record->decls())
    if (const auto *V = dyn_cast<VarDecl>(I)) {
      if (V->hasAttr<NoDebugAttr>())
        continue;

      // Skip variable template specializations when emitting CodeView. MSVC
      // doesn't emit them.
      if (CGM.getCodeGenOpts().EmitCodeView &&
          isa<VarTemplateSpecializationDecl>(V))
        continue;

      if (isa<VarTemplatePartialSpecializationDecl>(V))
        continue;

      // Reuse the existing static member declaration if one exists
      auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
      if (MI != StaticDataMemberCache.end()) {
        assert(MI->second &&((void)0)
               "Static data member declaration should still exist")((void)0);
        elements.push_back(MI->second);
      } else {
        auto Field = CreateRecordStaticField(V, RecordTy, record);
        elements.push_back(Field);
      }
    } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
      CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
                               elements, RecordTy, record);

      // Bump field number for next field.
      ++fieldNo;
    } else if (CGM.getCodeGenOpts().EmitCodeView) {
      // Debug info for nested types is included in the member list only for
      // CodeView.
      if (const auto *nestedType = dyn_cast<TypeDecl>(I))
        if (!nestedType->isImplicit() &&
            nestedType->getDeclContext() == record)
          CollectRecordNestedType(nestedType, elements);
    }
}
1571}

1573llvm::DISubroutineType *
1574CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
                                 llvm::DIFile *Unit, bool decl) {
const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
4
←
Assuming the object is not a 'FunctionProtoType'→
5
←
'Func' initialized to a null pointer value→
if (Method->isStatic())
6
←
Assuming the condition is false→
7
←
Taking false branch→
  return cast_or_null<llvm::DISubroutineType>(
      getOrCreateType(QualType(Func, 0), Unit));
return getOrCreateInstanceMethodType(Method->getThisType(), Func, Unit, decl);
8
←
Passing null pointer value via 2nd parameter 'Func'→
9
←
Calling 'CGDebugInfo::getOrCreateInstanceMethodType'→
1581}

1583llvm::DISubroutineType *
1584CGDebugInfo::getOrCreateInstanceMethodType(QualType ThisPtr,
                                         const FunctionProtoType *Func,
                                         llvm::DIFile *Unit, bool decl) {
// Add "this" pointer.
llvm::DITypeRefArray Args(
    cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
        ->getTypeArray());
assert(Args.size() && "Invalid number of arguments!")((void)0);

SmallVector<llvm::Metadata *, 16> Elts;
// First element is always return type. For 'void' functions it is NULL.
QualType temp = Func->getReturnType();
10
←
Called C++ object pointer is null
if (temp->getTypeClass() == Type::Auto && decl)
  Elts.push_back(CreateType(cast<AutoType>(temp)));
else
  Elts.push_back(Args[0]);

// "this" pointer is always first argument.
const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
if (isa<ClassTemplateSpecializationDecl>(RD)) {
  // Create pointer type directly in this case.
  const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
  QualType PointeeTy = ThisPtrTy->getPointeeType();
  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
  auto Align = getTypeAlignIfRequired(ThisPtrTy, CGM.getContext());
  llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
  llvm::DIType *ThisPtrType =
      DBuilder.createPointerType(PointeeType, Size, Align);
  TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
  // TODO: This and the artificial type below are misleading, the
  // types aren't artificial the argument is, but the current
  // metadata doesn't represent that.
  ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
  Elts.push_back(ThisPtrType);
} else {
  llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
  TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
  ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
  Elts.push_back(ThisPtrType);
}

// Copy rest of the arguments.
for (unsigned i = 1, e = Args.size(); i != e; ++i)
  Elts.push_back(Args[i]);

llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);

llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
  Flags |= llvm::DINode::FlagLValueReference;
if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
  Flags |= llvm::DINode::FlagRValueReference;

return DBuilder.createSubroutineType(EltTypeArray, Flags,
                                     getDwarfCC(Func->getCallConv()));
1640}

1642/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1643/// inside a function.
1644static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
if (const auto *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
  return isFunctionLocalClass(NRD);
if (isa<FunctionDecl>(RD->getDeclContext()))
  return true;
return false;
1650}

1652llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
  const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
bool IsCtorOrDtor =
    isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1
Assuming 'Method' is not a 'CXXConstructorDecl'→
2
←
Assuming 'Method' is not a 'CXXDestructorDecl'→

StringRef MethodName = getFunctionName(Method);
llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit, true);
3
←
Calling 'CGDebugInfo::getOrCreateMethodType'→

// Since a single ctor/dtor corresponds to multiple functions, it doesn't
// make sense to give a single ctor/dtor a linkage name.
StringRef MethodLinkageName;
// FIXME: 'isFunctionLocalClass' seems like an arbitrary/unintentional
// property to use here. It may've been intended to model "is non-external
// type" but misses cases of non-function-local but non-external classes such
// as those in anonymous namespaces as well as the reverse - external types
// that are function local, such as those in (non-local) inline functions.
if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
  MethodLinkageName = CGM.getMangledName(Method);

// Get the location for the method.
llvm::DIFile *MethodDefUnit = nullptr;
unsigned MethodLine = 0;
if (!Method->isImplicit()) {
  MethodDefUnit = getOrCreateFile(Method->getLocation());
  MethodLine = getLineNumber(Method->getLocation());
}

// Collect virtual method info.
llvm::DIType *ContainingType = nullptr;
unsigned VIndex = 0;
llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
int ThisAdjustment = 0;

if (Method->isVirtual()) {
  if (Method->isPure())
    SPFlags |= llvm::DISubprogram::SPFlagPureVirtual;
  else
    SPFlags |= llvm::DISubprogram::SPFlagVirtual;

  if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
    // It doesn't make sense to give a virtual destructor a vtable index,
    // since a single destructor has two entries in the vtable.
    if (!isa<CXXDestructorDecl>(Method))
      VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
  } else {
    // Emit MS ABI vftable information.  There is only one entry for the
    // deleting dtor.
    const auto *DD = dyn_cast<CXXDestructorDecl>(Method);
    GlobalDecl GD = DD ? GlobalDecl(DD, Dtor_Deleting) : GlobalDecl(Method);
    MethodVFTableLocation ML =
        CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
    VIndex = ML.Index;

    // CodeView only records the vftable offset in the class that introduces
    // the virtual method. This is possible because, unlike Itanium, the MS
    // C++ ABI does not include all virtual methods from non-primary bases in
    // the vtable for the most derived class. For example, if C inherits from
    // A and B, C's primary vftable will not include B's virtual methods.
    if (Method->size_overridden_methods() == 0)
      Flags |= llvm::DINode::FlagIntroducedVirtual;

    // The 'this' adjustment accounts for both the virtual and non-virtual
    // portions of the adjustment. Presumably the debugger only uses it when
    // it knows the dynamic type of an object.
    ThisAdjustment = CGM.getCXXABI()
                         .getVirtualFunctionPrologueThisAdjustment(GD)
                         .getQuantity();
  }
  ContainingType = RecordTy;
}

// We're checking for deleted C++ special member functions
// [Ctors,Dtors, Copy/Move]
auto checkAttrDeleted = [&](const auto *Method) {
  if (Method->getCanonicalDecl()->isDeleted())
    SPFlags |= llvm::DISubprogram::SPFlagDeleted;
};

switch (Method->getKind()) {

case Decl::CXXConstructor:
case Decl::CXXDestructor:
  checkAttrDeleted(Method);
  break;
case Decl::CXXMethod:
  if (Method->isCopyAssignmentOperator() ||
      Method->isMoveAssignmentOperator())
    checkAttrDeleted(Method);
  break;
default:
  break;
}

if (Method->isNoReturn())
  Flags |= llvm::DINode::FlagNoReturn;

if (Method->isStatic())
  Flags |= llvm::DINode::FlagStaticMember;
if (Method->isImplicit())
  Flags |= llvm::DINode::FlagArtificial;
Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
if (const auto *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
  if (CXXC->isExplicit())
    Flags |= llvm::DINode::FlagExplicit;
} else if (const auto *CXXC = dyn_cast<CXXConversionDecl>(Method)) {
  if (CXXC->isExplicit())
    Flags |= llvm::DINode::FlagExplicit;
}
if (Method->hasPrototype())
  Flags |= llvm::DINode::FlagPrototyped;
if (Method->getRefQualifier() == RQ_LValue)
  Flags |= llvm::DINode::FlagLValueReference;
if (Method->getRefQualifier() == RQ_RValue)
  Flags |= llvm::DINode::FlagRValueReference;
if (!Method->isExternallyVisible())
  SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
if (CGM.getLangOpts().Optimize)
  SPFlags |= llvm::DISubprogram::SPFlagOptimized;

// In this debug mode, emit type info for a class when its constructor type
// info is emitted.
if (DebugKind == codegenoptions::DebugInfoConstructor)
  if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
    completeUnusedClass(*CD->getParent());

llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
llvm::DISubprogram *SP = DBuilder.createMethod(
    RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
    MethodTy, VIndex, ThisAdjustment, ContainingType, Flags, SPFlags,
    TParamsArray.get());

SPCache[Method->getCanonicalDecl()].reset(SP);

return SP;
1787}

1789void CGDebugInfo::CollectCXXMemberFunctions(
  const CXXRecordDecl *RD, llvm::DIFile *Unit,
  SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {

// Since we want more than just the individual member decls if we
// have templated functions iterate over every declaration to gather
// the functions.
for (const auto *I : RD->decls()) {
  const auto *Method = dyn_cast<CXXMethodDecl>(I);
  // If the member is implicit, don't add it to the member list. This avoids
  // the member being added to type units by LLVM, while still allowing it
  // to be emitted into the type declaration/reference inside the compile
  // unit.
  // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
  // FIXME: Handle Using(Shadow?)Decls here to create
  // DW_TAG_imported_declarations inside the class for base decls brought into
  // derived classes. GDB doesn't seem to notice/leverage these when I tried
  // it, so I'm not rushing to fix this. (GCC seems to produce them, if
  // referenced)
  if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
    continue;

  if (Method->getType()->castAs<FunctionProtoType>()->getContainedAutoType())
    continue;

  // Reuse the existing member function declaration if it exists.
  // It may be associated with the declaration of the type & should be
  // reused as we're building the definition.
  //
  // This situation can arise in the vtable-based debug info reduction where
  // implicit members are emitted in a non-vtable TU.
  auto MI = SPCache.find(Method->getCanonicalDecl());
  EltTys.push_back(MI == SPCache.end()
                       ? CreateCXXMemberFunction(Method, Unit, RecordTy)
                       : static_cast<llvm::Metadata *>(MI->second));
}
1825}

1827void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
                                SmallVectorImpl<llvm::Metadata *> &EltTys,
                                llvm::DIType *RecordTy) {
llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> SeenTypes;
CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->bases(), SeenTypes,
                   llvm::DINode::FlagZero);

// If we are generating CodeView debug info, we also need to emit records for
// indirect virtual base classes.
if (CGM.getCodeGenOpts().EmitCodeView) {
  CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->vbases(), SeenTypes,
                     llvm::DINode::FlagIndirectVirtualBase);
}
1840}

1842void CGDebugInfo::CollectCXXBasesAux(
  const CXXRecordDecl *RD, llvm::DIFile *Unit,
  SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
  const CXXRecordDecl::base_class_const_range &Bases,
  llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
  llvm::DINode::DIFlags StartingFlags) {
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
for (const auto &BI : Bases) {
  const auto *Base =
      cast<CXXRecordDecl>(BI.getType()->castAs<RecordType>()->getDecl());
  if (!SeenTypes.insert(Base).second)
    continue;
  auto *BaseTy = getOrCreateType(BI.getType(), Unit);
  llvm::DINode::DIFlags BFlags = StartingFlags;
  uint64_t BaseOffset;
  uint32_t VBPtrOffset = 0;

  if (BI.isVirtual()) {
    if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
      // virtual base offset offset is -ve. The code generator emits dwarf
      // expression where it expects +ve number.
      BaseOffset = 0 - CGM.getItaniumVTableContext()
                           .getVirtualBaseOffsetOffset(RD, Base)
                           .getQuantity();
    } else {
      // In the MS ABI, store the vbtable offset, which is analogous to the
      // vbase offset offset in Itanium.
      BaseOffset =
          4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
      VBPtrOffset = CGM.getContext()
                        .getASTRecordLayout(RD)
                        .getVBPtrOffset()
                        .getQuantity();
    }
    BFlags |= llvm::DINode::FlagVirtual;
  } else
    BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
  // FIXME: Inconsistent units for BaseOffset. It is in bytes when
  // BI->isVirtual() and bits when not.

  BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
  llvm::DIType *DTy = DBuilder.createInheritance(RecordTy, BaseTy, BaseOffset,
                                                 VBPtrOffset, BFlags);
  EltTys.push_back(DTy);
}
1887}

1889llvm::DINodeArray
1890CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
                                 ArrayRef<TemplateArgument> TAList,
                                 llvm::DIFile *Unit) {
SmallVector<llvm::Metadata *, 16> TemplateParams;
for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
  const TemplateArgument &TA = TAList[i];
  StringRef Name;
  bool defaultParameter = false;
  if (TPList)
    Name = TPList->getParam(i)->getName();
  switch (TA.getKind()) {
  case TemplateArgument::Type: {
    llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);

    if (TPList)
      if (auto *templateType =
              dyn_cast_or_null<TemplateTypeParmDecl>(TPList->getParam(i)))
        if (templateType->hasDefaultArgument())
          defaultParameter =
              templateType->getDefaultArgument() == TA.getAsType();

    TemplateParams.push_back(DBuilder.createTemplateTypeParameter(
        TheCU, Name, TTy, defaultParameter));

  } break;
  case TemplateArgument::Integral: {
    llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
    if (TPList && CGM.getCodeGenOpts().DwarfVersion >= 5)
      if (auto *templateType =
              dyn_cast_or_null<NonTypeTemplateParmDecl>(TPList->getParam(i)))
        if (templateType->hasDefaultArgument() &&
            !templateType->getDefaultArgument()->isValueDependent())
          defaultParameter = llvm::APSInt::isSameValue(
              templateType->getDefaultArgument()->EvaluateKnownConstInt(
                  CGM.getContext()),
              TA.getAsIntegral());

    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy, defaultParameter,
        llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
  } break;
  case TemplateArgument::Declaration: {
    const ValueDecl *D = TA.getAsDecl();
    QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
    llvm::DIType *TTy = getOrCreateType(T, Unit);
    llvm::Constant *V = nullptr;
    // Skip retrieve the value if that template parameter has cuda device
    // attribute, i.e. that value is not available at the host side.
    if (!CGM.getLangOpts().CUDA || CGM.getLangOpts().CUDAIsDevice ||
        !D->hasAttr<CUDADeviceAttr>()) {
      const CXXMethodDecl *MD;
      // Variable pointer template parameters have a value that is the address
      // of the variable.
      if (const auto *VD = dyn_cast<VarDecl>(D))
        V = CGM.GetAddrOfGlobalVar(VD);
      // Member function pointers have special support for building them,
      // though this is currently unsupported in LLVM CodeGen.
      else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
        V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
      else if (const auto *FD = dyn_cast<FunctionDecl>(D))
        V = CGM.GetAddrOfFunction(FD);
      // Member data pointers have special handling too to compute the fixed
      // offset within the object.
      else if (const auto *MPT =
                   dyn_cast<MemberPointerType>(T.getTypePtr())) {
        // These five lines (& possibly the above member function pointer
        // handling) might be able to be refactored to use similar code in
        // CodeGenModule::getMemberPointerConstant
        uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
        CharUnits chars =
            CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
        V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
      } else if (const auto *GD = dyn_cast<MSGuidDecl>(D)) {
        V = CGM.GetAddrOfMSGuidDecl(GD).getPointer();
      } else if (const auto *TPO = dyn_cast<TemplateParamObjectDecl>(D)) {
        if (T->isRecordType())
          V = ConstantEmitter(CGM).emitAbstract(
              SourceLocation(), TPO->getValue(), TPO->getType());
        else
          V = CGM.GetAddrOfTemplateParamObject(TPO).getPointer();
      }
      assert(V && "Failed to find template parameter pointer")((void)0);
      V = V->stripPointerCasts();
    }
    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy, defaultParameter, cast_or_null<llvm::Constant>(V)));
  } break;
  case TemplateArgument::NullPtr: {
    QualType T = TA.getNullPtrType();
    llvm::DIType *TTy = getOrCreateType(T, Unit);
    llvm::Constant *V = nullptr;
    // Special case member data pointer null values since they're actually -1
    // instead of zero.
    if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr()))
      // But treat member function pointers as simple zero integers because
      // it's easier than having a special case in LLVM's CodeGen. If LLVM
      // CodeGen grows handling for values of non-null member function
      // pointers then perhaps we could remove this special case and rely on
      // EmitNullMemberPointer for member function pointers.
      if (MPT->isMemberDataPointer())
        V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
    if (!V)
      V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy, defaultParameter, V));
  } break;
  case TemplateArgument::Template:
    TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
        TheCU, Name, nullptr,
        TA.getAsTemplate().getAsTemplateDecl()->getQualifiedNameAsString()));
    break;
  case TemplateArgument::Pack:
    TemplateParams.push_back(DBuilder.createTemplateParameterPack(
        TheCU, Name, nullptr,
        CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
    break;
  case TemplateArgument::Expression: {
    const Expr *E = TA.getAsExpr();
    QualType T = E->getType();
    if (E->isGLValue())
      T = CGM.getContext().getLValueReferenceType(T);
    llvm::Constant *V = ConstantEmitter(CGM).emitAbstract(E, T);
    assert(V && "Expression in template argument isn't constant")((void)0);
    llvm::DIType *TTy = getOrCreateType(T, Unit);
    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy, defaultParameter, V->stripPointerCasts()));
  } break;
  // And the following should never occur:
  case TemplateArgument::TemplateExpansion:
  case TemplateArgument::Null:
    llvm_unreachable(__builtin_unreachable()
        "These argument types shouldn't exist in concrete types")__builtin_unreachable();
  }
}
return DBuilder.getOrCreateArray(TemplateParams);
2025}

2027llvm::DINodeArray
2028CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
                                         llvm::DIFile *Unit) {
if (FD->getTemplatedKind() ==
    FunctionDecl::TK_FunctionTemplateSpecialization) {
  const TemplateParameterList *TList = FD->getTemplateSpecializationInfo()
                                           ->getTemplate()
                                           ->getTemplateParameters();
  return CollectTemplateParams(
      TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
}
return llvm::DINodeArray();
2039}

2041llvm::DINodeArray CGDebugInfo::CollectVarTemplateParams(const VarDecl *VL,
                                                      llvm::DIFile *Unit) {
// Always get the full list of parameters, not just the ones from the
// specialization. A partial specialization may have fewer parameters than
// there are arguments.
auto *TS = dyn_cast<VarTemplateSpecializationDecl>(VL);
if (!TS)
  return llvm::DINodeArray();
VarTemplateDecl *T = TS->getSpecializedTemplate();
const TemplateParameterList *TList = T->getTemplateParameters();
auto TA = TS->getTemplateArgs().asArray();
return CollectTemplateParams(TList, TA, Unit);
2053}

2055llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
  const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
// Always get the full list of parameters, not just the ones from the
// specialization. A partial specialization may have fewer parameters than
// there are arguments.
TemplateParameterList *TPList =
    TSpecial->getSpecializedTemplate()->getTemplateParameters();
const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
return CollectTemplateParams(TPList, TAList.asArray(), Unit);
2064}

2066llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
if (VTablePtrType)
  return VTablePtrType;

ASTContext &Context = CGM.getContext();

/* Function type */
llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
Optional<unsigned> DWARFAddressSpace =
    CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);

llvm::DIType *vtbl_ptr_type = DBuilder.createPointerType(
    SubTy, Size, 0, DWARFAddressSpace, "__vtbl_ptr_type");
VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
return VTablePtrType;
2085}

2087StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
// Copy the gdb compatible name on the side and use its reference.
return internString("_vptr$", RD->getNameAsString());
2090}

2092StringRef CGDebugInfo::getDynamicInitializerName(const VarDecl *VD,
                                               DynamicInitKind StubKind,
                                               llvm::Function *InitFn) {
// If we're not emitting codeview, use the mangled name. For Itanium, this is
// arbitrary.
if (!CGM.getCodeGenOpts().EmitCodeView ||
    StubKind == DynamicInitKind::GlobalArrayDestructor)
  return InitFn->getName();

// Print the normal qualified name for the variable, then break off the last
// NNS, and add the appropriate other text. Clang always prints the global
// variable name without template arguments, so we can use rsplit("::") and
// then recombine the pieces.
SmallString<128> QualifiedGV;
StringRef Quals;
StringRef GVName;
{
  llvm::raw_svector_ostream OS(QualifiedGV);
  VD->printQualifiedName(OS, getPrintingPolicy());
  std::tie(Quals, GVName) = OS.str().rsplit("::");
  if (GVName.empty())
    std::swap(Quals, GVName);
}

SmallString<128> InitName;
llvm::raw_svector_ostream OS(InitName);
if (!Quals.empty())
  OS << Quals << "::";

switch (StubKind) {
case DynamicInitKind::NoStub:
case DynamicInitKind::GlobalArrayDestructor:
  llvm_unreachable("not an initializer")__builtin_unreachable();
case DynamicInitKind::Initializer:
  OS << "`dynamic initializer for '";
  break;
case DynamicInitKind::AtExit:
  OS << "`dynamic atexit destructor for '";
  break;
}

OS << GVName;

// Add any template specialization args.
if (const auto *VTpl = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
  printTemplateArgumentList(OS, VTpl->getTemplateArgs().asArray(),
                            getPrintingPolicy());
}

OS << '\'';

return internString(OS.str());
2144}

2146void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
                                  SmallVectorImpl<llvm::Metadata *> &EltTys) {
// If this class is not dynamic then there is not any vtable info to collect.
if (!RD->isDynamicClass())
  return;

// Don't emit any vtable shape or vptr info if this class doesn't have an
// extendable vfptr. This can happen if the class doesn't have virtual
// methods, or in the MS ABI if those virtual methods only come from virtually
// inherited bases.
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
if (!RL.hasExtendableVFPtr())
  return;

// CodeView needs to know how large the vtable of every dynamic class is, so
// emit a special named pointer type into the element list. The vptr type
// points to this type as well.
llvm::DIType *VPtrTy = nullptr;
bool NeedVTableShape = CGM.getCodeGenOpts().EmitCodeView &&
                       CGM.getTarget().getCXXABI().isMicrosoft();
if (NeedVTableShape) {
  uint64_t PtrWidth =
      CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
  const VTableLayout &VFTLayout =
      CGM.getMicrosoftVTableContext().getVFTableLayout(RD, CharUnits::Zero());
  unsigned VSlotCount =
      VFTLayout.vtable_components().size() - CGM.getLangOpts().RTTIData;
  unsigned VTableWidth = PtrWidth * VSlotCount;
  unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
  Optional<unsigned> DWARFAddressSpace =
      CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);

  // Create a very wide void* type and insert it directly in the element list.
  llvm::DIType *VTableType = DBuilder.createPointerType(
      nullptr, VTableWidth, 0, DWARFAddressSpace, "__vtbl_ptr_type");
  EltTys.push_back(VTableType);

  // The vptr is a pointer to this special vtable type.
  VPtrTy = DBuilder.createPointerType(VTableType, PtrWidth);
}

// If there is a primary base then the artificial vptr member lives there.
if (RL.getPrimaryBase())
  return;

if (!VPtrTy)
  VPtrTy = getOrCreateVTablePtrType(Unit);

unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
llvm::DIType *VPtrMember =
    DBuilder.createMemberType(Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
                              llvm::DINode::FlagArtificial, VPtrTy);
EltTys.push_back(VPtrMember);
2199}

2201llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
                                               SourceLocation Loc) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
return T;
2206}

2208llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
                                                  SourceLocation Loc) {
return getOrCreateStandaloneType(D, Loc);
2211}

2213llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
                                                   SourceLocation Loc) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
assert(!D.isNull() && "null type")((void)0);
llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
assert(T && "could not create debug info for type")((void)0);

RetainedTypes.push_back(D.getAsOpaquePtr());
return T;
2222}

2224void CGDebugInfo::addHeapAllocSiteMetadata(llvm::CallBase *CI,
                                         QualType AllocatedTy,
                                         SourceLocation Loc) {
if (CGM.getCodeGenOpts().getDebugInfo() <=
    codegenoptions::DebugLineTablesOnly)
  return;
llvm::MDNode *node;
if (AllocatedTy->isVoidType())
  node = llvm::MDNode::get(CGM.getLLVMContext(), None);
else
  node = getOrCreateType(AllocatedTy, getOrCreateFile(Loc));

CI->setMetadata("heapallocsite", node);
2237}

2239void CGDebugInfo::completeType(const EnumDecl *ED) {
if (DebugKind <= codegenoptions::DebugLineTablesOnly)
  return;
QualType Ty = CGM.getContext().getEnumType(ED);
void *TyPtr = Ty.getAsOpaquePtr();
auto I = TypeCache.find(TyPtr);
if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
  return;
llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
assert(!Res->isForwardDecl())((void)0);
TypeCache[TyPtr].reset(Res);
2250}

2252void CGDebugInfo::completeType(const RecordDecl *RD) {
if (DebugKind > codegenoptions::LimitedDebugInfo ||
    !CGM.getLangOpts().CPlusPlus)
  completeRequiredType(RD);
2256}

2258/// Return true if the class or any of its methods are marked dllimport.
2259static bool isClassOrMethodDLLImport(const CXXRecordDecl *RD) {
if (RD->hasAttr<DLLImportAttr>())
  return true;
for (const CXXMethodDecl *MD : RD->methods())
  if (MD->hasAttr<DLLImportAttr>())
    return true;
return false;
2266}

2268/// Does a type definition exist in an imported clang module?
2269static bool isDefinedInClangModule(const RecordDecl *RD) {
// Only definitions that where imported from an AST file come from a module.
if (!RD || !RD->isFromASTFile())
  return false;
// Anonymous entities cannot be addressed. Treat them as not from module.
if (!RD->isExternallyVisible() && RD->getName().empty())
  return false;
if (auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD)) {
  if (!CXXDecl->isCompleteDefinition())
    return false;
  // Check wether RD is a template.
  auto TemplateKind = CXXDecl->getTemplateSpecializationKind();
  if (TemplateKind != TSK_Undeclared) {
    // Unfortunately getOwningModule() isn't accurate enough to find the
    // owning module of a ClassTemplateSpecializationDecl that is inside a
    // namespace spanning multiple modules.
    bool Explicit = false;
    if (auto *TD = dyn_cast<ClassTemplateSpecializationDecl>(CXXDecl))
      Explicit = TD->isExplicitInstantiationOrSpecialization();
    if (!Explicit && CXXDecl->getEnclosingNamespaceContext())
      return false;
    // This is a template, check the origin of the first member.
    if (CXXDecl->field_begin() == CXXDecl->field_end())
      return TemplateKind == TSK_ExplicitInstantiationDeclaration;
    if (!CXXDecl->field_begin()->isFromASTFile())
      return false;
  }
}
return true;
2298}

2300void CGDebugInfo::completeClassData(const RecordDecl *RD) {
if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
  if (CXXRD->isDynamicClass() &&
      CGM.getVTableLinkage(CXXRD) ==
          llvm::GlobalValue::AvailableExternallyLinkage &&
      !isClassOrMethodDLLImport(CXXRD))
    return;

if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
  return;

completeClass(RD);
2312}

2314void CGDebugInfo::completeClass(const RecordDecl *RD) {
if (DebugKind <= codegenoptions::DebugLineTablesOnly)
  return;
QualType Ty = CGM.getContext().getRecordType(RD);
void *TyPtr = Ty.getAsOpaquePtr();
auto I = TypeCache.find(TyPtr);
if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
  return;
llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
assert(!Res->isForwardDecl())((void)0);
TypeCache[TyPtr].reset(Res);
2325}

2327static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I,
                                      CXXRecordDecl::method_iterator End) {
for (CXXMethodDecl *MD : llvm::make_range(I, End))
  if (FunctionDecl *Tmpl = MD->getInstantiatedFromMemberFunction())
    if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
        !MD->getMemberSpecializationInfo()->isExplicitSpecialization())
      return true;
return false;
2335}

2337static bool canUseCtorHoming(const CXXRecordDecl *RD) {
// Constructor homing can be used for classes that cannnot be constructed
// without emitting code for one of their constructors. This is classes that
// don't have trivial or constexpr constructors, or can be created from
// aggregate initialization. Also skip lambda objects because they don't call
// constructors.

// Skip this optimization if the class or any of its methods are marked
// dllimport.
if (isClassOrMethodDLLImport(RD))
  return false;

return !RD->isLambda() && !RD->isAggregate() &&
       !RD->hasTrivialDefaultConstructor() &&
       !RD->hasConstexprNonCopyMoveConstructor();
2352}

2354static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind,
                               bool DebugTypeExtRefs, const RecordDecl *RD,
                               const LangOptions &LangOpts) {
if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
  return true;

if (auto *ES = RD->getASTContext().getExternalSource())
  if (ES->hasExternalDefinitions(RD) == ExternalASTSource::EK_Always)
    return true;

// Only emit forward declarations in line tables only to keep debug info size
// small. This only applies to CodeView, since we don't emit types in DWARF
// line tables only.
if (DebugKind == codegenoptions::DebugLineTablesOnly)
  return true;

if (DebugKind > codegenoptions::LimitedDebugInfo ||
    RD->hasAttr<StandaloneDebugAttr>())
  return false;

if (!LangOpts.CPlusPlus)
  return false;

if (!RD->isCompleteDefinitionRequired())
  return true;

const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);

if (!CXXDecl)
  return false;

// Only emit complete debug info for a dynamic class when its vtable is
// emitted.  However, Microsoft debuggers don't resolve type information
// across DLL boundaries, so skip this optimization if the class or any of its
// methods are marked dllimport. This isn't a complete solution, since objects
// without any dllimport methods can be used in one DLL and constructed in
// another, but it is the current behavior of LimitedDebugInfo.
if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
    !isClassOrMethodDLLImport(CXXDecl))
  return true;

TemplateSpecializationKind Spec = TSK_Undeclared;
if (const auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD))
  Spec = SD->getSpecializationKind();

if (Spec == TSK_ExplicitInstantiationDeclaration &&
    hasExplicitMemberDefinition(CXXDecl->method_begin(),
                                CXXDecl->method_end()))
  return true;

// In constructor homing mode, only emit complete debug info for a class
// when its constructor is emitted.
if ((DebugKind == codegenoptions::DebugInfoConstructor) &&
    canUseCtorHoming(CXXDecl))
  return true;

return false;
2411}

2413void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
if (shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD, CGM.getLangOpts()))
  return;

QualType Ty = CGM.getContext().getRecordType(RD);
llvm::DIType *T = getTypeOrNull(Ty);
if (T && T->isForwardDecl())
  completeClassData(RD);
2421}

2423llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();
llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
                              CGM.getLangOpts())) {
  if (!T)
    T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
  return T;
}

return CreateTypeDefinition(Ty);
2434}

2436llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();

// Get overall information about the record type for the debug info.
llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());

// Records and classes and unions can all be recursive.  To handle them, we
// first generate a debug descriptor for the struct as a forward declaration.
// Then (if it is a definition) we go through and get debug info for all of
// its members.  Finally, we create a descriptor for the complete type (which
// may refer to the forward decl if the struct is recursive) and replace all
// uses of the forward declaration with the final definition.
llvm::DICompositeType *FwdDecl = getOrCreateLimitedType(Ty);

const RecordDecl *D = RD->getDefinition();
if (!D || !D->isCompleteDefinition())
  return FwdDecl;

if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
  CollectContainingType(CXXDecl, FwdDecl);

// Push the struct on region stack.
LexicalBlockStack.emplace_back(&*FwdDecl);
RegionMap[Ty->getDecl()].reset(FwdDecl);

// Convert all the elements.
SmallVector<llvm::Metadata *, 16> EltTys;
// what about nested types?

// Note: The split of CXXDecl information here is intentional, the
// gdb tests will depend on a certain ordering at printout. The debug
// information offsets are still correct if we merge them all together
// though.
const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
if (CXXDecl) {
  CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
  CollectVTableInfo(CXXDecl, DefUnit, EltTys);
}

// Collect data fields (including static variables and any initializers).
CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
if (CXXDecl)
  CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);

LexicalBlockStack.pop_back();
RegionMap.erase(Ty->getDecl());

llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
DBuilder.replaceArrays(FwdDecl, Elements);

if (FwdDecl->isTemporary())
  FwdDecl =
      llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));

RegionMap[Ty->getDecl()].reset(FwdDecl);
return FwdDecl;
2492}

2494llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
                                    llvm::DIFile *Unit) {
// Ignore protocols.
return getOrCreateType(Ty->getBaseType(), Unit);
2498}

2500llvm::DIType *CGDebugInfo::CreateType(const ObjCTypeParamType *Ty,
                                    llvm::DIFile *Unit) {
// Ignore protocols.
SourceLocation Loc = Ty->getDecl()->getLocation();

// Use Typedefs to represent ObjCTypeParamType.
return DBuilder.createTypedef(
    getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
    Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
    getDeclContextDescriptor(Ty->getDecl()));
2510}

2512/// \return true if Getter has the default name for the property PD.
2513static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
                               const ObjCMethodDecl *Getter) {
assert(PD)((void)0);
if (!Getter)
  return true;

assert(Getter->getDeclName().isObjCZeroArgSelector())((void)0);
return PD->getName() ==
       Getter->getDeclName().getObjCSelector().getNameForSlot(0);
2522}

2524/// \return true if Setter has the default name for the property PD.
2525static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
                               const ObjCMethodDecl *Setter) {
assert(PD)((void)0);
if (!Setter)
  return true;

assert(Setter->getDeclName().isObjCOneArgSelector())((void)0);
return SelectorTable::constructSetterName(PD->getName()) ==
       Setter->getDeclName().getObjCSelector().getNameForSlot(0);
2534}

2536llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
                                    llvm::DIFile *Unit) {
ObjCInterfaceDecl *ID = Ty->getDecl();
if (!ID)
  return nullptr;

// Return a forward declaration if this type was imported from a clang module,
// and this is not the compile unit with the implementation of the type (which
// may contain hidden ivars).
if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition() &&
    !ID->getImplementation())
  return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
                                    ID->getName(),
                                    getDeclContextDescriptor(ID), Unit, 0);

// Get overall information about the record type for the debug info.
llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
unsigned Line = getLineNumber(ID->getLocation());
auto RuntimeLang =
    static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());

// If this is just a forward declaration return a special forward-declaration
// debug type since we won't be able to lay out the entire type.
ObjCInterfaceDecl *Def = ID->getDefinition();
if (!Def || !Def->getImplementation()) {
  llvm::DIScope *Mod = getParentModuleOrNull(ID);
  llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
      llvm::dwarf::DW_TAG_structure_type, ID->getName(), Mod ? Mod : TheCU,
      DefUnit, Line, RuntimeLang);
  ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
  return FwdDecl;
}

return CreateTypeDefinition(Ty, Unit);
2570}

2572llvm::DIModule *CGDebugInfo::getOrCreateModuleRef(ASTSourceDescriptor Mod,
                                                bool CreateSkeletonCU) {
// Use the Module pointer as the key into the cache. This is a
// nullptr if the "Module" is a PCH, which is safe because we don't
// support chained PCH debug info, so there can only be a single PCH.
const Module *M = Mod.getModuleOrNull();
auto ModRef = ModuleCache.find(M);
if (ModRef != ModuleCache.end())
  return cast<llvm::DIModule>(ModRef->second);

// Macro definitions that were defined with "-D" on the command line.
SmallString<128> ConfigMacros;
{
  llvm::raw_svector_ostream OS(ConfigMacros);
  const auto &PPOpts = CGM.getPreprocessorOpts();
  unsigned I = 0;
  // Translate the macro definitions back into a command line.
  for (auto &M : PPOpts.Macros) {
    if (++I > 1)
      OS << " ";
    const std::string &Macro = M.first;
    bool Undef = M.second;
    OS << "\"-" << (Undef ? 'U' : 'D');
    for (char c : Macro)
      switch (c) {
      case '\\':
        OS << "\\\\";
        break;
      case '"':
        OS << "\\\"";
        break;
      default:
        OS << c;
      }
    OS << '\"';
  }
}

bool IsRootModule = M ? !M->Parent : true;
// When a module name is specified as -fmodule-name, that module gets a
// clang::Module object, but it won't actually be built or imported; it will
// be textual.
if (CreateSkeletonCU && IsRootModule && Mod.getASTFile().empty() && M)
  assert(StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName) &&((void)0)
         "clang module without ASTFile must be specified by -fmodule-name")((void)0);

// Return a StringRef to the remapped Path.
auto RemapPath = [this](StringRef Path) -> std::string {
  std::string Remapped = remapDIPath(Path);
  StringRef Relative(Remapped);
  StringRef CompDir = TheCU->getDirectory();
  if (Relative.consume_front(CompDir))
    Relative.consume_front(llvm::sys::path::get_separator());

  return Relative.str();
};

if (CreateSkeletonCU && IsRootModule && !Mod.getASTFile().empty()) {
  // PCH files don't have a signature field in the control block,
  // but LLVM detects skeleton CUs by looking for a non-zero DWO id.
  // We use the lower 64 bits for debug info.

  uint64_t Signature = 0;
  if (const auto &ModSig = Mod.getSignature())
    Signature = ModSig.truncatedValue();
  else
    Signature = ~1ULL;

  llvm::DIBuilder DIB(CGM.getModule());
  SmallString<0> PCM;
  if (!llvm::sys::path::is_absolute(Mod.getASTFile()))
    PCM = Mod.getPath();
  llvm::sys::path::append(PCM, Mod.getASTFile());
  DIB.createCompileUnit(
      TheCU->getSourceLanguage(),
      // TODO: Support "Source" from external AST providers?
      DIB.createFile(Mod.getModuleName(), TheCU->getDirectory()),
      TheCU->getProducer(), false, StringRef(), 0, RemapPath(PCM),
      llvm::DICompileUnit::FullDebug, Signature);
  DIB.finalize();
}

llvm::DIModule *Parent =
    IsRootModule ? nullptr
                 : getOrCreateModuleRef(ASTSourceDescriptor(*M->Parent),
                                        CreateSkeletonCU);
std::string IncludePath = Mod.getPath().str();
llvm::DIModule *DIMod =
    DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
                          RemapPath(IncludePath));
ModuleCache[M].reset(DIMod);
return DIMod;
2664}

2666llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
                                              llvm::DIFile *Unit) {
ObjCInterfaceDecl *ID = Ty->getDecl();
llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
unsigned Line = getLineNumber(ID->getLocation());
unsigned RuntimeLang = TheCU->getSourceLanguage();

// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(Ty);
auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());

llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
if (ID->getImplementation())
  Flags |= llvm::DINode::FlagObjcClassComplete;

llvm::DIScope *Mod = getParentModuleOrNull(ID);
llvm::DICompositeType *RealDecl = DBuilder.createStructType(
    Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
    nullptr, llvm::DINodeArray(), RuntimeLang);

QualType QTy(Ty, 0);
TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);

// Push the struct on region stack.
LexicalBlockStack.emplace_back(RealDecl);
RegionMap[Ty->getDecl()].reset(RealDecl);

// Convert all the elements.
SmallVector<llvm::Metadata *, 16> EltTys;

ObjCInterfaceDecl *SClass = ID->getSuperClass();
if (SClass) {
  llvm::DIType *SClassTy =
      getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
  if (!SClassTy)
    return nullptr;

  llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0, 0,
                                                    llvm::DINode::FlagZero);
  EltTys.push_back(InhTag);
}

// Create entries for all of the properties.
auto AddProperty = [&](const ObjCPropertyDecl *PD) {
  SourceLocation Loc = PD->getLocation();
  llvm::DIFile *PUnit = getOrCreateFile(Loc);
  unsigned PLine = getLineNumber(Loc);
  ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
  ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
  llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
      PD->getName(), PUnit, PLine,
      hasDefaultGetterName(PD, Getter) ? ""
                                       : getSelectorName(PD->getGetterName()),
      hasDefaultSetterName(PD, Setter) ? ""
                                       : getSelectorName(PD->getSetterName()),
      PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
  EltTys.push_back(PropertyNode);
};
{
  // Use 'char' for the isClassProperty bit as DenseSet requires space for
  // empty/tombstone keys in the data type (and bool is too small for that).
  typedef std::pair<char, const IdentifierInfo *> IsClassAndIdent;
  /// List of already emitted properties. Two distinct class and instance
  /// properties can share the same identifier (but not two instance
  /// properties or two class properties).
  llvm::DenseSet<IsClassAndIdent> PropertySet;
  /// Returns the IsClassAndIdent key for the given property.
  auto GetIsClassAndIdent = [](const ObjCPropertyDecl *PD) {
    return std::make_pair(PD->isClassProperty(), PD->getIdentifier());
  };
  for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
    for (auto *PD : ClassExt->properties()) {
      PropertySet.insert(GetIsClassAndIdent(PD));
      AddProperty(PD);
    }
  for (const auto *PD : ID->properties()) {
    // Don't emit duplicate metadata for properties that were already in a
    // class extension.
    if (!PropertySet.insert(GetIsClassAndIdent(PD)).second)
      continue;
    AddProperty(PD);
  }
}

const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
unsigned FieldNo = 0;
for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
     Field = Field->getNextIvar(), ++FieldNo) {
  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
  if (!FieldTy)
    return nullptr;

  StringRef FieldName = Field->getName();

  // Ignore unnamed fields.
  if (FieldName.empty())
    continue;

  // Get the location for the field.
  llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
  unsigned FieldLine = getLineNumber(Field->getLocation());
  QualType FType = Field->getType();
  uint64_t FieldSize = 0;
  uint32_t FieldAlign = 0;

  if (!FType->isIncompleteArrayType()) {

    // Bit size, align and offset of the type.
    FieldSize = Field->isBitField()
                    ? Field->getBitWidthValue(CGM.getContext())
                    : CGM.getContext().getTypeSize(FType);
    FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
  }

  uint64_t FieldOffset;
  if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
    // We don't know the runtime offset of an ivar if we're using the
    // non-fragile ABI.  For bitfields, use the bit offset into the first
    // byte of storage of the bitfield.  For other fields, use zero.
    if (Field->isBitField()) {
      FieldOffset =
          CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
      FieldOffset %= CGM.getContext().getCharWidth();
    } else {
      FieldOffset = 0;
    }
  } else {
    FieldOffset = RL.getFieldOffset(FieldNo);
  }

  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
  if (Field->getAccessControl() == ObjCIvarDecl::Protected)
    Flags = llvm::DINode::FlagProtected;
  else if (Field->getAccessControl() == ObjCIvarDecl::Private)
    Flags = llvm::DINode::FlagPrivate;
  else if (Field->getAccessControl() == ObjCIvarDecl::Public)
    Flags = llvm::DINode::FlagPublic;

  llvm::MDNode *PropertyNode = nullptr;
  if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
    if (ObjCPropertyImplDecl *PImpD =
            ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
      if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
        SourceLocation Loc = PD->getLocation();
        llvm::DIFile *PUnit = getOrCreateFile(Loc);
        unsigned PLine = getLineNumber(Loc);
        ObjCMethodDecl *Getter = PImpD->getGetterMethodDecl();
        ObjCMethodDecl *Setter = PImpD->getSetterMethodDecl();
        PropertyNode = DBuilder.createObjCProperty(
            PD->getName(), PUnit, PLine,
            hasDefaultGetterName(PD, Getter)
                ? ""
                : getSelectorName(PD->getGetterName()),
            hasDefaultSetterName(PD, Setter)
                ? ""
                : getSelectorName(PD->getSetterName()),
            PD->getPropertyAttributes(),
            getOrCreateType(PD->getType(), PUnit));
      }
    }
  }
  FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
                                    FieldSize, FieldAlign, FieldOffset, Flags,
                                    FieldTy, PropertyNode);
  EltTys.push_back(FieldTy);
}

llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
DBuilder.replaceArrays(RealDecl, Elements);

LexicalBlockStack.pop_back();
return RealDecl;
2838}

2840llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
                                    llvm::DIFile *Unit) {
llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
int64_t Count = Ty->getNumElements();

llvm::Metadata *Subscript;
QualType QTy(Ty, 0);
auto SizeExpr = SizeExprCache.find(QTy);
if (SizeExpr != SizeExprCache.end())
  Subscript = DBuilder.getOrCreateSubrange(
      SizeExpr->getSecond() /*count*/, nullptr /*lowerBound*/,
      nullptr /*upperBound*/, nullptr /*stride*/);
else {
  auto *CountNode =
      llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
          llvm::Type::getInt64Ty(CGM.getLLVMContext()), Count ? Count : -1));
  Subscript = DBuilder.getOrCreateSubrange(
      CountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
      nullptr /*stride*/);
}
llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);

uint64_t Size = CGM.getContext().getTypeSize(Ty);
auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());

return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
2866}

2868llvm::DIType *CGDebugInfo::CreateType(const ConstantMatrixType *Ty,
                                    llvm::DIFile *Unit) {
// FIXME: Create another debug type for matrices
// For the time being, it treats it like a nested ArrayType.

llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint32_t Align = getTypeAlignIfRequired(Ty, CGM.getContext());

// Create ranges for both dimensions.
llvm::SmallVector<llvm::Metadata *, 2> Subscripts;
auto *ColumnCountNode =
    llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
        llvm::Type::getInt64Ty(CGM.getLLVMContext()), Ty->getNumColumns()));
auto *RowCountNode =
    llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
        llvm::Type::getInt64Ty(CGM.getLLVMContext()), Ty->getNumRows()));
Subscripts.push_back(DBuilder.getOrCreateSubrange(
    ColumnCountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
    nullptr /*stride*/));
Subscripts.push_back(DBuilder.getOrCreateSubrange(
    RowCountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
    nullptr /*stride*/));
llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
return DBuilder.createArrayType(Size, Align, ElementTy, SubscriptArray);
2893}

2895llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
uint64_t Size;
uint32_t Align;

// FIXME: make getTypeAlign() aware of VLAs and incomplete array types
if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
  Size = 0;
  Align = getTypeAlignIfRequired(CGM.getContext().getBaseElementType(VAT),
                                 CGM.getContext());
} else if (Ty->isIncompleteArrayType()) {
  Size = 0;
  if (Ty->getElementType()->isIncompleteType())
    Align = 0;
  else
    Align = getTypeAlignIfRequired(Ty->getElementType(), CGM.getContext());
} else if (Ty->isIncompleteType()) {
  Size = 0;
  Align = 0;
} else {
  // Size and align of the whole array, not the element type.
  Size = CGM.getContext().getTypeSize(Ty);
  Align = getTypeAlignIfRequired(Ty, CGM.getContext());
}

// Add the dimensions of the array.  FIXME: This loses CV qualifiers from
// interior arrays, do we care?  Why aren't nested arrays represented the
// obvious/recursive way?
SmallVector<llvm::Metadata *, 8> Subscripts;
QualType EltTy(Ty, 0);
while ((Ty = dyn_cast<ArrayType>(EltTy))) {
  // If the number of elements is known, then count is that number. Otherwise,
  // it's -1. This allows us to represent a subrange with an array of 0
  // elements, like this:
  //
  //   struct foo {
  //     int x[0];
  //   };
  int64_t Count = -1; // Count == -1 is an unbounded array.
  if (const auto *CAT = dyn_cast<ConstantArrayType>(Ty))
    Count = CAT->getSize().getZExtValue();
  else if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
    if (Expr *Size = VAT->getSizeExpr()) {
      Expr::EvalResult Result;
      if (Size->EvaluateAsInt(Result, CGM.getContext()))
        Count = Result.Val.getInt().getExtValue();
    }
  }

  auto SizeNode = SizeExprCache.find(EltTy);
  if (SizeNode != SizeExprCache.end())
    Subscripts.push_back(DBuilder.getOrCreateSubrange(
        SizeNode->getSecond() /*count*/, nullptr /*lowerBound*/,
        nullptr /*upperBound*/, nullptr /*stride*/));
  else {
    auto *CountNode =
        llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
            llvm::Type::getInt64Ty(CGM.getLLVMContext()), Count));
    Subscripts.push_back(DBuilder.getOrCreateSubrange(
        CountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
        nullptr /*stride*/));
  }
  EltTy = Ty->getElementType();
}

llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);

return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
                                SubscriptArray);
2963}

2965llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
                                    llvm::DIFile *Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
                             Ty->getPointeeType(), Unit);
2969}

2971llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
                                    llvm::DIFile *Unit) {
llvm::dwarf::Tag Tag = llvm::dwarf::DW_TAG_rvalue_reference_type;
// DW_TAG_rvalue_reference_type was introduced in DWARF 4.
if (CGM.getCodeGenOpts().DebugStrictDwarf &&
    CGM.getCodeGenOpts().DwarfVersion < 4)
  Tag = llvm::dwarf::DW_TAG_reference_type;

return CreatePointerLikeType(Tag, Ty, Ty->getPointeeType(), Unit);
2980}

2982llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
                                    llvm::DIFile *U) {
llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
uint64_t Size = 0;

if (!Ty->isIncompleteType()) {
  Size = CGM.getContext().getTypeSize(Ty);

  // Set the MS inheritance model. There is no flag for the unspecified model.
  if (CGM.getTarget().getCXXABI().isMicrosoft()) {
    switch (Ty->getMostRecentCXXRecordDecl()->getMSInheritanceModel()) {
    case MSInheritanceModel::Single:
      Flags |= llvm::DINode::FlagSingleInheritance;
      break;
    case MSInheritanceModel::Multiple:
      Flags |= llvm::DINode::FlagMultipleInheritance;
      break;
    case MSInheritanceModel::Virtual:
      Flags |= llvm::DINode::FlagVirtualInheritance;
      break;
    case MSInheritanceModel::Unspecified:
      break;
    }
  }
}

llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
if (Ty->isMemberDataPointerType())
  return DBuilder.createMemberPointerType(
      getOrCreateType(Ty->getPointeeType(), U), ClassType, Size, /*Align=*/0,
      Flags);

const FunctionProtoType *FPT =
    Ty->getPointeeType()->getAs<FunctionProtoType>();
return DBuilder.createMemberPointerType(
    getOrCreateInstanceMethodType(
        CXXMethodDecl::getThisType(FPT, Ty->getMostRecentCXXRecordDecl()),
        FPT, U, false),
    ClassType, Size, /*Align=*/0, Flags);
3021}

3023llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
auto *FromTy = getOrCreateType(Ty->getValueType(), U);
return DBuilder.createQualifiedType(llvm::dwarf::DW_TAG_atomic_type, FromTy);
3026}

3028llvm::DIType *CGDebugInfo::CreateType(const PipeType *Ty, llvm::DIFile *U) {
return getOrCreateType(Ty->getElementType(), U);
3030}

3032llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
const EnumDecl *ED = Ty->getDecl();

uint64_t Size = 0;
uint32_t Align = 0;
if (!ED->getTypeForDecl()->isIncompleteType()) {
  Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
  Align = getDeclAlignIfRequired(ED, CGM.getContext());
}

SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);

bool isImportedFromModule =
    DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();

// If this is just a forward declaration, construct an appropriately
// marked node and just return it.
if (isImportedFromModule || !ED->getDefinition()) {
  // Note that it is possible for enums to be created as part of
  // their own declcontext. In this case a FwdDecl will be created
  // twice. This doesn't cause a problem because both FwdDecls are
  // entered into the ReplaceMap: finalize() will replace the first
  // FwdDecl with the second and then replace the second with
  // complete type.
  llvm::DIScope *EDContext = getDeclContextDescriptor(ED);
  llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
  llvm::TempDIScope TmpContext(DBuilder.createReplaceableCompositeType(
      llvm::dwarf::DW_TAG_enumeration_type, "", TheCU, DefUnit, 0));

  unsigned Line = getLineNumber(ED->getLocation());
  StringRef EDName = ED->getName();
  llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
      llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
      0, Size, Align, llvm::DINode::FlagFwdDecl, Identifier);

  ReplaceMap.emplace_back(
      std::piecewise_construct, std::make_tuple(Ty),
      std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
  return RetTy;
}

return CreateTypeDefinition(Ty);
3074}

3076llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
const EnumDecl *ED = Ty->getDecl();
uint64_t Size = 0;
uint32_t Align = 0;
if (!ED->getTypeForDecl()->isIncompleteType()) {
  Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
  Align = getDeclAlignIfRequired(ED, CGM.getContext());
}

SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);

SmallVector<llvm::Metadata *, 16> Enumerators;
ED = ED->getDefinition();
for (const auto *Enum : ED->enumerators()) {
  Enumerators.push_back(
      DBuilder.createEnumerator(Enum->getName(), Enum->getInitVal()));
}

// Return a CompositeType for the enum itself.
llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);

llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
unsigned Line = getLineNumber(ED->getLocation());
llvm::DIScope *EnumContext = getDeclContextDescriptor(ED);
llvm::DIType *ClassTy = getOrCreateType(ED->getIntegerType(), DefUnit);
return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
                                      Line, Size, Align, EltArray, ClassTy,
                                      Identifier, ED->isScoped());
3104}

3106llvm::DIMacro *CGDebugInfo::CreateMacro(llvm::DIMacroFile *Parent,
                                      unsigned MType, SourceLocation LineLoc,
                                      StringRef Name, StringRef Value) {
unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
return DBuilder.createMacro(Parent, Line, MType, Name, Value);
3111}

3113llvm::DIMacroFile *CGDebugInfo::CreateTempMacroFile(llvm::DIMacroFile *Parent,
                                                  SourceLocation LineLoc,
                                                  SourceLocation FileLoc) {
llvm::DIFile *FName = getOrCreateFile(FileLoc);
unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
return DBuilder.createTempMacroFile(Parent, Line, FName);
3119}

3121static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
Qualifiers Quals;
do {
  Qualifiers InnerQuals = T.getLocalQualifiers();
  // Qualifiers::operator+() doesn't like it if you add a Qualifier
  // that is already there.
  Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
  Quals += InnerQuals;
  QualType LastT = T;
  switch (T->getTypeClass()) {
  default:
    return C.getQualifiedType(T.getTypePtr(), Quals);
  case Type::TemplateSpecialization: {
    const auto *Spec = cast<TemplateSpecializationType>(T);
    if (Spec->isTypeAlias())
      return C.getQualifiedType(T.getTypePtr(), Quals);
    T = Spec->desugar();
    break;
  }
  case Type::TypeOfExpr:
    T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
    break;
  case Type::TypeOf:
    T = cast<TypeOfType>(T)->getUnderlyingType();
    break;
  case Type::Decltype:
    T = cast<DecltypeType>(T)->getUnderlyingType();
    break;
  case Type::UnaryTransform:
    T = cast<UnaryTransformType>(T)->getUnderlyingType();
    break;
  case Type::Attributed:
    T = cast<AttributedType>(T)->getEquivalentType();
    break;
  case Type::Elaborated:
    T = cast<ElaboratedType>(T)->getNamedType();
    break;
  case Type::Paren:
    T = cast<ParenType>(T)->getInnerType();
    break;
  case Type::MacroQualified:
    T = cast<MacroQualifiedType>(T)->getUnderlyingType();
    break;
  case Type::SubstTemplateTypeParm:
    T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
    break;
  case Type::Auto:
  case Type::DeducedTemplateSpecialization: {
    QualType DT = cast<DeducedType>(T)->getDeducedType();
    assert(!DT.isNull() && "Undeduced types shouldn't reach here.")((void)0);
    T = DT;
    break;
  }
  case Type::Adjusted:
  case Type::Decayed:
    // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
    T = cast<AdjustedType>(T)->getAdjustedType();
    break;
  }

  assert(T != LastT && "Type unwrapping failed to unwrap!")((void)0);
  (void)LastT;
} while (true);
3184}

3186llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
assert(Ty == UnwrapTypeForDebugInfo(Ty, CGM.getContext()))((void)0);
auto It = TypeCache.find(Ty.getAsOpaquePtr());
if (It != TypeCache.end()) {
  // Verify that the debug info still exists.
  if (llvm::Metadata *V = It->second)
    return cast<llvm::DIType>(V);
}

return nullptr;
3196}

3198void CGDebugInfo::completeTemplateDefinition(
  const ClassTemplateSpecializationDecl &SD) {
completeUnusedClass(SD);
3201}

3203void CGDebugInfo::completeUnusedClass(const CXXRecordDecl &D) {
if (DebugKind <= codegenoptions::DebugLineTablesOnly)
  return;

completeClassData(&D);
// In case this type has no member function definitions being emitted, ensure
// it is retained
RetainedTypes.push_back(CGM.getContext().getRecordType(&D).getAsOpaquePtr());
3211}

3213llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
if (Ty.isNull())
  return nullptr;

llvm::TimeTraceScope TimeScope("DebugType", [&]() {
  std::string Name;
  llvm::raw_string_ostream OS(Name);
  Ty.print(OS, getPrintingPolicy());
  return Name;
});

// Unwrap the type as needed for debug information.
Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());

if (auto *T = getTypeOrNull(Ty))
  return T;

llvm::DIType *Res = CreateTypeNode(Ty, Unit);
void *TyPtr = Ty.getAsOpaquePtr();

// And update the type cache.
TypeCache[TyPtr].reset(Res);

return Res;
3237}

3239llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
// A forward declaration inside a module header does not belong to the module.
if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
  return nullptr;
if (DebugTypeExtRefs && D->isFromASTFile()) {
  // Record a reference to an imported clang module or precompiled header.
  auto *Reader = CGM.getContext().getExternalSource();
  auto Idx = D->getOwningModuleID();
  auto Info = Reader->getSourceDescriptor(Idx);
  if (Info)
    return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
} else if (ClangModuleMap) {
  // We are building a clang module or a precompiled header.
  //
  // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
  // and it wouldn't be necessary to specify the parent scope
  // because the type is already unique by definition (it would look
  // like the output of -fno-standalone-debug). On the other hand,
  // the parent scope helps a consumer to quickly locate the object
  // file where the type's definition is located, so it might be
  // best to make this behavior a command line or debugger tuning
  // option.
  if (Module *M = D->getOwningModule()) {
    // This is a (sub-)module.
    auto Info = ASTSourceDescriptor(*M);
    return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
  } else {
    // This the precompiled header being built.
    return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
  }
}

return nullptr;
3272}

3274llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
// Handle qualifiers, which recursively handles what they refer to.
if (Ty.hasLocalQualifiers())
  return CreateQualifiedType(Ty, Unit);

// Work out details of type.
switch (Ty->getTypeClass()) {
3281#define TYPE(Class, Base)
3282#define ABSTRACT_TYPE(Class, Base)
3283#define NON_CANONICAL_TYPE(Class, Base)
3284#define DEPENDENT_TYPE(Class, Base) case Type::Class:
3285#include "clang/AST/TypeNodes.inc"
  llvm_unreachable("Dependent types cannot show up in debug information")__builtin_unreachable();

case Type::ExtVector:
case Type::Vector:
  return CreateType(cast<VectorType>(Ty), Unit);
case Type::ConstantMatrix:
  return CreateType(cast<ConstantMatrixType>(Ty), Unit);
case Type::ObjCObjectPointer:
  return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
case Type::ObjCObject:
  return CreateType(cast<ObjCObjectType>(Ty), Unit);
case Type::ObjCTypeParam:
  return CreateType(cast<ObjCTypeParamType>(Ty), Unit);
case Type::ObjCInterface:
  return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
case Type::Builtin:
  return CreateType(cast<BuiltinType>(Ty));
case Type::Complex:
  return CreateType(cast<ComplexType>(Ty));
case Type::Pointer:
  return CreateType(cast<PointerType>(Ty), Unit);
case Type::BlockPointer:
  return CreateType(cast<BlockPointerType>(Ty), Unit);
case Type::Typedef:
  return CreateType(cast<TypedefType>(Ty), Unit);
case Type::Record:
  return CreateType(cast<RecordType>(Ty));
case Type::Enum:
  return CreateEnumType(cast<EnumType>(Ty));
case Type::FunctionProto:
case Type::FunctionNoProto:
  return CreateType(cast<FunctionType>(Ty), Unit);
case Type::ConstantArray:
case Type::VariableArray:
case Type::IncompleteArray:
  return CreateType(cast<ArrayType>(Ty), Unit);

case Type::LValueReference:
  return CreateType(cast<LValueReferenceType>(Ty), Unit);
case Type::RValueReference:
  return CreateType(cast<RValueReferenceType>(Ty), Unit);

case Type::MemberPointer:
  return CreateType(cast<MemberPointerType>(Ty), Unit);

case Type::Atomic:
  return CreateType(cast<AtomicType>(Ty), Unit);

case Type::ExtInt:
  return CreateType(cast<ExtIntType>(Ty));
case Type::Pipe:
  return CreateType(cast<PipeType>(Ty), Unit);

case Type::TemplateSpecialization:
  return CreateType(cast<TemplateSpecializationType>(Ty), Unit);

case Type::Auto:
case Type::Attributed:
case Type::Adjusted:
case Type::Decayed:
case Type::DeducedTemplateSpecialization:
case Type::Elaborated:
case Type::Paren:
case Type::MacroQualified:
case Type::SubstTemplateTypeParm:
case Type::TypeOfExpr:
case Type::TypeOf:
case Type::Decltype:
case Type::UnaryTransform:
  break;
}

llvm_unreachable("type should have been unwrapped!")__builtin_unreachable();
3359}

3361llvm::DICompositeType *
3362CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty) {
QualType QTy(Ty, 0);

auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));

// We may have cached a forward decl when we could have created
// a non-forward decl. Go ahead and create a non-forward decl
// now.
if (T && !T->isForwardDecl())
  return T;

// Otherwise create the type.
llvm::DICompositeType *Res = CreateLimitedType(Ty);

// Propagate members from the declaration to the definition
// CreateType(const RecordType*) will overwrite this with the members in the
// correct order if the full type is needed.
DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());

// And update the type cache.
TypeCache[QTy.getAsOpaquePtr()].reset(Res);
return Res;
3384}

3386// TODO: Currently used for context chains when limiting debug info.
3387llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();

// Get overall information about the record type for the debug info.
StringRef RDName = getClassName(RD);
const SourceLocation Loc = RD->getLocation();
llvm::DIFile *DefUnit = nullptr;
unsigned Line = 0;
if (Loc.isValid()) {
  DefUnit = getOrCreateFile(Loc);
  Line = getLineNumber(Loc);
}

llvm::DIScope *RDContext = getDeclContextDescriptor(RD);

// If we ended up creating the type during the context chain construction,
// just return that.
auto *T = cast_or_null<llvm::DICompositeType>(
    getTypeOrNull(CGM.getContext().getRecordType(RD)));
if (T && (!T->isForwardDecl() || !RD->getDefinition()))
  return T;

// If this is just a forward or incomplete declaration, construct an
// appropriately marked node and just return it.
const RecordDecl *D = RD->getDefinition();
if (!D || !D->isCompleteDefinition())
  return getOrCreateRecordFwdDecl(Ty, RDContext);

uint64_t Size = CGM.getContext().getTypeSize(Ty);
auto Align = getDeclAlignIfRequired(D, CGM.getContext());

SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);

// Explicitly record the calling convention and export symbols for C++
// records.
auto Flags = llvm::DINode::FlagZero;
if (auto CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
  if (CGM.getCXXABI().getRecordArgABI(CXXRD) == CGCXXABI::RAA_Indirect)
    Flags |= llvm::DINode::FlagTypePassByReference;
  else
    Flags |= llvm::DINode::FlagTypePassByValue;

  // Record if a C++ record is non-trivial type.
  if (!CXXRD->isTrivial())
    Flags |= llvm::DINode::FlagNonTrivial;

  // Record exports it symbols to the containing structure.
  if (CXXRD->isAnonymousStructOrUnion())
      Flags |= llvm::DINode::FlagExportSymbols;
}

llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
    getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align,
    Flags, Identifier);

// Elements of composite types usually have back to the type, creating
// uniquing cycles.  Distinct nodes are more efficient.
switch (RealDecl->getTag()) {
default:
  llvm_unreachable("invalid composite type tag")__builtin_unreachable();

case llvm::dwarf::DW_TAG_array_type:
case llvm::dwarf::DW_TAG_enumeration_type:
  // Array elements and most enumeration elements don't have back references,
  // so they don't tend to be involved in uniquing cycles and there is some
  // chance of merging them when linking together two modules.  Only make
  // them distinct if they are ODR-uniqued.
  if (Identifier.empty())
    break;
  LLVM_FALLTHROUGH[[gnu::fallthrough]];

case llvm::dwarf::DW_TAG_structure_type:
case llvm::dwarf::DW_TAG_union_type:
case llvm::dwarf::DW_TAG_class_type:
  // Immediately resolve to a distinct node.
  RealDecl =
      llvm::MDNode::replaceWithDistinct(llvm::TempDICompositeType(RealDecl));
  break;
}

RegionMap[Ty->getDecl()].reset(RealDecl);
TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);

if (const auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
  DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
                         CollectCXXTemplateParams(TSpecial, DefUnit));
return RealDecl;
3474}

3476void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
                                      llvm::DICompositeType *RealDecl) {
// A class's primary base or the class itself contains the vtable.
llvm::DICompositeType *ContainingType = nullptr;
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
  // Seek non-virtual primary base root.
  while (1) {
    const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
    const CXXRecordDecl *PBT = BRL.getPrimaryBase();
    if (PBT && !BRL.isPrimaryBaseVirtual())
      PBase = PBT;
    else
      break;
  }
  ContainingType = cast<llvm::DICompositeType>(
      getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
                      getOrCreateFile(RD->getLocation())));
} else if (RD->isDynamicClass())
  ContainingType = RealDecl;

DBuilder.replaceVTableHolder(RealDecl, ContainingType);
3498}

3500llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
                                          StringRef Name, uint64_t *Offset) {
llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
auto FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
llvm::DIType *Ty =
    DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize, FieldAlign,
                              *Offset, llvm::DINode::FlagZero, FieldTy);
*Offset += FieldSize;
return Ty;
3510}

3512void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
                                         StringRef &Name,
                                         StringRef &LinkageName,
                                         llvm::DIScope *&FDContext,
                                         llvm::DINodeArray &TParamsArray,
                                         llvm::DINode::DIFlags &Flags) {
const auto *FD = cast<FunctionDecl>(GD.getCanonicalDecl().getDecl());
Name = getFunctionName(FD);
// Use mangled name as linkage name for C/C++ functions.
if (FD->getType()->getAs<FunctionProtoType>())
  LinkageName = CGM.getMangledName(GD);
if (FD->hasPrototype())
  Flags |= llvm::DINode::FlagPrototyped;
// No need to replicate the linkage name if it isn't different from the
// subprogram name, no need to have it at all unless coverage is enabled or
// debug is set to more than just line tables or extra debug info is needed.
if (LinkageName == Name || (!CGM.getCodeGenOpts().EmitGcovArcs &&
                            !CGM.getCodeGenOpts().EmitGcovNotes &&
                            !CGM.getCodeGenOpts().DebugInfoForProfiling &&
                            !CGM.getCodeGenOpts().PseudoProbeForProfiling &&
                            DebugKind <= codegenoptions::DebugLineTablesOnly))
  LinkageName = StringRef();

// Emit the function scope in line tables only mode (if CodeView) to
// differentiate between function names.
if (CGM.getCodeGenOpts().hasReducedDebugInfo() ||
    (DebugKind == codegenoptions::DebugLineTablesOnly &&
     CGM.getCodeGenOpts().EmitCodeView)) {
  if (const NamespaceDecl *NSDecl =
          dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
    FDContext = getOrCreateNamespace(NSDecl);
  else if (const RecordDecl *RDecl =
               dyn_cast_or_null<RecordDecl>(FD->getDeclContext())) {
    llvm::DIScope *Mod = getParentModuleOrNull(RDecl);
    FDContext = getContextDescriptor(RDecl, Mod ? Mod : TheCU);
  }
}
if (CGM.getCodeGenOpts().hasReducedDebugInfo()) {
  // Check if it is a noreturn-marked function
  if (FD->isNoReturn())
    Flags |= llvm::DINode::FlagNoReturn;
  // Collect template parameters.
  TParamsArray = CollectFunctionTemplateParams(FD, Unit);
}
3556}

3558void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
                                    unsigned &LineNo, QualType &T,
                                    StringRef &Name, StringRef &LinkageName,
                                    llvm::MDTuple *&TemplateParameters,
                                    llvm::DIScope *&VDContext) {
Unit = getOrCreateFile(VD->getLocation());
LineNo = getLineNumber(VD->getLocation());

setLocation(VD->getLocation());

T = VD->getType();
if (T->isIncompleteArrayType()) {
  // CodeGen turns int[] into int[1] so we'll do the same here.
  llvm::APInt ConstVal(32, 1);
  QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();

  T = CGM.getContext().getConstantArrayType(ET, ConstVal, nullptr,
                                            ArrayType::Normal, 0);
}

Name = VD->getName();
if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
    !isa<ObjCMethodDecl>(VD->getDeclContext()))
  LinkageName = CGM.getMangledName(VD);
if (LinkageName == Name)
  LinkageName = StringRef();

if (isa<VarTemplateSpecializationDecl>(VD)) {
  llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VD, &*Unit);
  TemplateParameters = parameterNodes.get();
} else {
  TemplateParameters = nullptr;
}

// Since we emit declarations (DW_AT_members) for static members, place the
// definition of those static members in the namespace they were declared in
// in the source code (the lexical decl context).
// FIXME: Generalize this for even non-member global variables where the
// declaration and definition may have different lexical decl contexts, once
// we have support for emitting declarations of (non-member) global variables.
const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
                                                 : VD->getDeclContext();
// When a record type contains an in-line initialization of a static data
// member, and the record type is marked as __declspec(dllexport), an implicit
// definition of the member will be created in the record context.  DWARF
// doesn't seem to have a nice way to describe this in a form that consumers
// are likely to understand, so fake the "normal" situation of a definition
// outside the class by putting it in the global scope.
if (DC->isRecord())
  DC = CGM.getContext().getTranslationUnitDecl();

llvm::DIScope *Mod = getParentModuleOrNull(VD);
VDContext = getContextDescriptor(cast<Decl>(DC), Mod ? Mod : TheCU);
3611}

3613llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
                                                        bool Stub) {
llvm::DINodeArray TParamsArray;
StringRef Name, LinkageName;
llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
SourceLocation Loc = GD.getDecl()->getLocation();
llvm::DIFile *Unit = getOrCreateFile(Loc);
llvm::DIScope *DContext = Unit;
unsigned Line = getLineNumber(Loc);
collectFunctionDeclProps(GD, Unit, Name, LinkageName, DContext, TParamsArray,
                         Flags);
auto *FD = cast<FunctionDecl>(GD.getDecl());

// Build function type.
SmallVector<QualType, 16> ArgTypes;
for (const ParmVarDecl *Parm : FD->parameters())
  ArgTypes.push_back(Parm->getType());

CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
QualType FnType = CGM.getContext().getFunctionType(
    FD->getReturnType(), ArgTypes, FunctionProtoType::ExtProtoInfo(CC));
if (!FD->isExternallyVisible())
  SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
if (CGM.getLangOpts().Optimize)
  SPFlags |= llvm::DISubprogram::SPFlagOptimized;

if (Stub) {
  Flags |= getCallSiteRelatedAttrs();
  SPFlags |= llvm::DISubprogram::SPFlagDefinition;
  return DBuilder.createFunction(
      DContext, Name, LinkageName, Unit, Line,
      getOrCreateFunctionType(GD.getDecl(), FnType, Unit), 0, Flags, SPFlags,
      TParamsArray.get(), getFunctionDeclaration(FD));
}

llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
    DContext, Name, LinkageName, Unit, Line,
    getOrCreateFunctionType(GD.getDecl(), FnType, Unit), 0, Flags, SPFlags,
    TParamsArray.get(), getFunctionDeclaration(FD));
const FunctionDecl *CanonDecl = FD->getCanonicalDecl();
FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
                               std::make_tuple(CanonDecl),
                               std::make_tuple(SP));
return SP;
3658}

3660llvm::DISubprogram *CGDebugInfo::getFunctionForwardDeclaration(GlobalDecl GD) {
return getFunctionFwdDeclOrStub(GD, /* Stub = */ false);
3662}

3664llvm::DISubprogram *CGDebugInfo::getFunctionStub(GlobalDecl GD) {
return getFunctionFwdDeclOrStub(GD, /* Stub = */ true);
3666}

3668llvm::DIGlobalVariable *
3669CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
QualType T;
StringRef Name, LinkageName;
SourceLocation Loc = VD->getLocation();
llvm::DIFile *Unit = getOrCreateFile(Loc);
llvm::DIScope *DContext = Unit;
unsigned Line = getLineNumber(Loc);
llvm::MDTuple *TemplateParameters = nullptr;

collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, TemplateParameters,
                    DContext);
auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
    DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
    !VD->isExternallyVisible(), nullptr, TemplateParameters, Align);
FwdDeclReplaceMap.emplace_back(
    std::piecewise_construct,
    std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
    std::make_tuple(static_cast<llvm::Metadata *>(GV)));
return GV;
3689}

3691llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
// We only need a declaration (not a definition) of the type - so use whatever
// we would otherwise do to get a type for a pointee. (forward declarations in
// limited debug info, full definitions (if the type definition is available)
// in unlimited debug info)
if (const auto *TD = dyn_cast<TypeDecl>(D))
  return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
                         getOrCreateFile(TD->getLocation()));
auto I = DeclCache.find(D->getCanonicalDecl());

if (I != DeclCache.end()) {
  auto N = I->second;
  if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(N))
    return GVE->getVariable();
  return dyn_cast_or_null<llvm::DINode>(N);
}

// No definition for now. Emit a forward definition that might be
// merged with a potential upcoming definition.
if (const auto *FD = dyn_cast<FunctionDecl>(D))
  return getFunctionForwardDeclaration(FD);
else if (const auto *VD = dyn_cast<VarDecl>(D))
  return getGlobalVariableForwardDeclaration(VD);

return nullptr;
3716}

3718llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
  return nullptr;

const auto *FD = dyn_cast<FunctionDecl>(D);
if (!FD)
  return nullptr;

// Setup context.
auto *S = getDeclContextDescriptor(D);

auto MI = SPCache.find(FD->getCanonicalDecl());
if (MI == SPCache.end()) {
  if (const auto *MD = dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
    return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
                                   cast<llvm::DICompositeType>(S));
  }
}
if (MI != SPCache.end()) {
  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
  if (SP && !SP->isDefinition())
    return SP;
}

for (auto NextFD : FD->redecls()) {
  auto MI = SPCache.find(NextFD->getCanonicalDecl());
  if (MI != SPCache.end()) {
    auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
    if (SP && !SP->isDefinition())
      return SP;
  }
}
return nullptr;
3751}

3753llvm::DISubprogram *CGDebugInfo::getObjCMethodDeclaration(
  const Decl *D, llvm::DISubroutineType *FnType, unsigned LineNo,
  llvm::DINode::DIFlags Flags, llvm::DISubprogram::DISPFlags SPFlags) {
if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
  return nullptr;

const auto *OMD = dyn_cast<ObjCMethodDecl>(D);
if (!OMD)
  return nullptr;

if (CGM.getCodeGenOpts().DwarfVersion < 5 && !OMD->isDirectMethod())
  return nullptr;

if (OMD->isDirectMethod())
  SPFlags |= llvm::DISubprogram::SPFlagObjCDirect;

// Starting with DWARF V5 method declarations are emitted as children of
// the interface type.
auto *ID = dyn_cast_or_null<ObjCInterfaceDecl>(D->getDeclContext());
if (!ID)
  ID = OMD->getClassInterface();
if (!ID)
  return nullptr;
QualType QTy(ID->getTypeForDecl(), 0);
auto It = TypeCache.find(QTy.getAsOpaquePtr());
if (It == TypeCache.end())
  return nullptr;
auto *InterfaceType = cast<llvm::DICompositeType>(It->second);
llvm::DISubprogram *FD = DBuilder.createFunction(
    InterfaceType, getObjCMethodName(OMD), StringRef(),
    InterfaceType->getFile(), LineNo, FnType, LineNo, Flags, SPFlags);
DBuilder.finalizeSubprogram(FD);
ObjCMethodCache[ID].push_back({FD, OMD->isDirectMethod()});
return FD;
3787}

3789// getOrCreateFunctionType - Construct type. If it is a c++ method, include
3790// implicit parameter "this".
3791llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
                                                           QualType FnType,
                                                           llvm::DIFile *F) {
// In CodeView, we emit the function types in line tables only because the
// only way to distinguish between functions is by display name and type.
if (!D || (DebugKind <= codegenoptions::DebugLineTablesOnly &&
           !CGM.getCodeGenOpts().EmitCodeView))
  // Create fake but valid subroutine type. Otherwise -verify would fail, and
  // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
  return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));

if (const auto *Method = dyn_cast<CXXMethodDecl>(D))
  return getOrCreateMethodType(Method, F, false);

const auto *FTy = FnType->getAs<FunctionType>();
CallingConv CC = FTy ? FTy->getCallConv() : CallingConv::CC_C;

if (const auto *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
  // Add "self" and "_cmd"
  SmallVector<llvm::Metadata *, 16> Elts;

  // First element is always return type. For 'void' functions it is NULL.
  QualType ResultTy = OMethod->getReturnType();

  // Replace the instancetype keyword with the actual type.
  if (ResultTy == CGM.getContext().getObjCInstanceType())
    ResultTy = CGM.getContext().getPointerType(
        QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));

  Elts.push_back(getOrCreateType(ResultTy, F));
  // "self" pointer is always first argument.
  QualType SelfDeclTy;
  if (auto *SelfDecl = OMethod->getSelfDecl())
    SelfDeclTy = SelfDecl->getType();
  else if (auto *FPT = dyn_cast<FunctionProtoType>(FnType))
    if (FPT->getNumParams() > 1)
      SelfDeclTy = FPT->getParamType(0);
  if (!SelfDeclTy.isNull())
    Elts.push_back(
        CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
  // "_cmd" pointer is always second argument.
  Elts.push_back(DBuilder.createArtificialType(
      getOrCreateType(CGM.getContext().getObjCSelType(), F)));
  // Get rest of the arguments.
  for (const auto *PI : OMethod->parameters())
    Elts.push_back(getOrCreateType(PI->getType(), F));
  // Variadic methods need a special marker at the end of the type list.
  if (OMethod->isVariadic())
    Elts.push_back(DBuilder.createUnspecifiedParameter());

  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
  return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
                                       getDwarfCC(CC));
}

// Handle variadic function types; they need an additional
// unspecified parameter.
if (const auto *FD = dyn_cast<FunctionDecl>(D))
  if (FD->isVariadic()) {
    SmallVector<llvm::Metadata *, 16> EltTys;
    EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
    if (const auto *FPT = dyn_cast<FunctionProtoType>(FnType))
      for (QualType ParamType : FPT->param_types())
        EltTys.push_back(getOrCreateType(ParamType, F));
    EltTys.push_back(DBuilder.createUnspecifiedParameter());
    llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
    return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
                                         getDwarfCC(CC));
  }

return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
3862}

3864void CGDebugInfo::emitFunctionStart(GlobalDecl GD, SourceLocation Loc,
                                  SourceLocation ScopeLoc, QualType FnType,
                                  llvm::Function *Fn, bool CurFuncIsThunk) {
StringRef Name;
StringRef LinkageName;

FnBeginRegionCount.push_back(LexicalBlockStack.size());

const Decl *D = GD.getDecl();
bool HasDecl = (D != nullptr);

llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
llvm::DIFile *Unit = getOrCreateFile(Loc);
llvm::DIScope *FDContext = Unit;
llvm::DINodeArray TParamsArray;
if (!HasDecl) {
  // Use llvm function name.
  LinkageName = Fn->getName();
} else if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
  // If there is a subprogram for this function available then use it.
  auto FI = SPCache.find(FD->getCanonicalDecl());
  if (FI != SPCache.end()) {
    auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
    if (SP && SP->isDefinition()) {
      LexicalBlockStack.emplace_back(SP);
      RegionMap[D].reset(SP);
      return;
    }
  }
  collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
                           TParamsArray, Flags);
} else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
  Name = getObjCMethodName(OMD);
  Flags |= llvm::DINode::FlagPrototyped;
} else if (isa<VarDecl>(D) &&
           GD.getDynamicInitKind() != DynamicInitKind::NoStub) {
  // This is a global initializer or atexit destructor for a global variable.
  Name = getDynamicInitializerName(cast<VarDecl>(D), GD.getDynamicInitKind(),
                                   Fn);
} else {
  Name = Fn->getName();

  if (isa<BlockDecl>(D))
    LinkageName = Name;

  Flags |= llvm::DINode::FlagPrototyped;
}
if (Name.startswith("\01"))
  Name = Name.substr(1);

if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>() ||
    (isa<VarDecl>(D) && GD.getDynamicInitKind() != DynamicInitKind::NoStub)) {
  Flags |= llvm::DINode::FlagArtificial;
  // Artificial functions should not silently reuse CurLoc.
  CurLoc = SourceLocation();
}

if (CurFuncIsThunk)
  Flags |= llvm::DINode::FlagThunk;

if (Fn->hasLocalLinkage())
  SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
if (CGM.getLangOpts().Optimize)
  SPFlags |= llvm::DISubprogram::SPFlagOptimized;

llvm::DINode::DIFlags FlagsForDef = Flags | getCallSiteRelatedAttrs();
llvm::DISubprogram::DISPFlags SPFlagsForDef =
    SPFlags | llvm::DISubprogram::SPFlagDefinition;

const unsigned LineNo = getLineNumber(Loc.isValid() ? Loc : CurLoc);
unsigned ScopeLine = getLineNumber(ScopeLoc);
llvm::DISubroutineType *DIFnType = getOrCreateFunctionType(D, FnType, Unit);
llvm::DISubprogram *Decl = nullptr;
if (D)
  Decl = isa<ObjCMethodDecl>(D)
             ? getObjCMethodDeclaration(D, DIFnType, LineNo, Flags, SPFlags)
             : getFunctionDeclaration(D);

// FIXME: The function declaration we're constructing here is mostly reusing
// declarations from CXXMethodDecl and not constructing new ones for arbitrary
// FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
// all subprograms instead of the actual context since subprogram definitions
// are emitted as CU level entities by the backend.
llvm::DISubprogram *SP = DBuilder.createFunction(
    FDContext, Name, LinkageName, Unit, LineNo, DIFnType, ScopeLine,
    FlagsForDef, SPFlagsForDef, TParamsArray.get(), Decl);
Fn->setSubprogram(SP);
// We might get here with a VarDecl in the case we're generating
// code for the initialization of globals. Do not record these decls
// as they will overwrite the actual VarDecl Decl in the cache.
if (HasDecl && isa<FunctionDecl>(D))
  DeclCache[D->getCanonicalDecl()].reset(SP);

// Push the function onto the lexical block stack.
LexicalBlockStack.emplace_back(SP);

if (HasDecl)
  RegionMap[D].reset(SP);
3963}

3965void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
                                 QualType FnType, llvm::Function *Fn) {
StringRef Name;
StringRef LinkageName;

const Decl *D = GD.getDecl();
if (!D)
  return;

llvm::TimeTraceScope TimeScope("DebugFunction", [&]() {
  return GetName(D, true);
});

llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
llvm::DIFile *Unit = getOrCreateFile(Loc);
bool IsDeclForCallSite = Fn ? true : false;
llvm::DIScope *FDContext =
    IsDeclForCallSite ? Unit : getDeclContextDescriptor(D);
llvm::DINodeArray TParamsArray;
if (isa<FunctionDecl>(D)) {
  // If there is a DISubprogram for this function available then use it.
  collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
                           TParamsArray, Flags);
} else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
  Name = getObjCMethodName(OMD);
  Flags |= llvm::DINode::FlagPrototyped;
} else {
  llvm_unreachable("not a function or ObjC method")__builtin_unreachable();
}
if (!Name.empty() && Name[0] == '\01')
  Name = Name.substr(1);

if (D->isImplicit()) {
  Flags |= llvm::DINode::FlagArtificial;
  // Artificial functions without a location should not silently reuse CurLoc.
  if (Loc.isInvalid())
    CurLoc = SourceLocation();
}
unsigned LineNo = getLineNumber(Loc);
unsigned ScopeLine = 0;
llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
if (CGM.getLangOpts().Optimize)
  SPFlags |= llvm::DISubprogram::SPFlagOptimized;

llvm::DISubprogram *SP = DBuilder.createFunction(
    FDContext, Name, LinkageName, Unit, LineNo,
    getOrCreateFunctionType(D, FnType, Unit), ScopeLine, Flags, SPFlags,
    TParamsArray.get(), getFunctionDeclaration(D));

if (IsDeclForCallSite)
  Fn->setSubprogram(SP);

DBuilder.finalizeSubprogram(SP);
4018}

4020void CGDebugInfo::EmitFuncDeclForCallSite(llvm::CallBase *CallOrInvoke,
                                        QualType CalleeType,
                                        const FunctionDecl *CalleeDecl) {
if (!CallOrInvoke)
  return;
auto *Func = CallOrInvoke->getCalledFunction();
if (!Func)
  return;
if (Func->getSubprogram())
  return;

// Do not emit a declaration subprogram for a builtin, a function with nodebug
// attribute, or if call site info isn't required. Also, elide declarations
// for functions with reserved names, as call site-related features aren't
// interesting in this case (& also, the compiler may emit calls to these
// functions without debug locations, which makes the verifier complain).
if (CalleeDecl->getBuiltinID() != 0 || CalleeDecl->hasAttr<NoDebugAttr>() ||
    getCallSiteRelatedAttrs() == llvm::DINode::FlagZero)
  return;
if (CalleeDecl->isReserved(CGM.getLangOpts()) !=
    ReservedIdentifierStatus::NotReserved)
  return;

// If there is no DISubprogram attached to the function being called,
// create the one describing the function in order to have complete
// call site debug info.
if (!CalleeDecl->isStatic() && !CalleeDecl->isInlined())
  EmitFunctionDecl(CalleeDecl, CalleeDecl->getLocation(), CalleeType, Func);
4048}

4050void CGDebugInfo::EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD) {
const auto *FD = cast<FunctionDecl>(GD.getDecl());
// If there is a subprogram for this function available then use it.
auto FI = SPCache.find(FD->getCanonicalDecl());
llvm::DISubprogram *SP = nullptr;
if (FI != SPCache.end())
  SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
if (!SP || !SP->isDefinition())
  SP = getFunctionStub(GD);
FnBeginRegionCount.push_back(LexicalBlockStack.size());
LexicalBlockStack.emplace_back(SP);
setInlinedAt(Builder.getCurrentDebugLocation());
EmitLocation(Builder, FD->getLocation());
4063}

4065void CGDebugInfo::EmitInlineFunctionEnd(CGBuilderTy &Builder) {
assert(CurInlinedAt && "unbalanced inline scope stack")((void)0);
EmitFunctionEnd(Builder, nullptr);
setInlinedAt(llvm::DebugLoc(CurInlinedAt).getInlinedAt());
4069}

4071void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
// Update our current location
setLocation(Loc);

if (CurLoc.isInvalid() || CurLoc.isMacroID() || LexicalBlockStack.empty())
  return;

llvm::MDNode *Scope = LexicalBlockStack.back();
Builder.SetCurrentDebugLocation(
    llvm::DILocation::get(CGM.getLLVMContext(), getLineNumber(CurLoc),
                          getColumnNumber(CurLoc), Scope, CurInlinedAt));
4082}

4084void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
llvm::MDNode *Back = nullptr;
if (!LexicalBlockStack.empty())
  Back = LexicalBlockStack.back().get();
LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
    cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
    getColumnNumber(CurLoc)));
4091}

4093void CGDebugInfo::AppendAddressSpaceXDeref(
  unsigned AddressSpace, SmallVectorImpl<int64_t> &Expr) const {
Optional<unsigned> DWARFAddressSpace =
    CGM.getTarget().getDWARFAddressSpace(AddressSpace);
if (!DWARFAddressSpace)
  return;

Expr.push_back(llvm::dwarf::DW_OP_constu);
Expr.push_back(DWARFAddressSpace.getValue());
Expr.push_back(llvm::dwarf::DW_OP_swap);
Expr.push_back(llvm::dwarf::DW_OP_xderef);
4104}

4106void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
                                      SourceLocation Loc) {
// Set our current location.
setLocation(Loc);

// Emit a line table change for the current location inside the new scope.
Builder.SetCurrentDebugLocation(llvm::DILocation::get(
    CGM.getLLVMContext(), getLineNumber(Loc), getColumnNumber(Loc),
    LexicalBlockStack.back(), CurInlinedAt));

if (DebugKind <= codegenoptions::DebugLineTablesOnly)
  return;

// Create a new lexical block and push it on the stack.
CreateLexicalBlock(Loc);
4121}

4123void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
                                    SourceLocation Loc) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((void)0);

// Provide an entry in the line table for the end of the block.
EmitLocation(Builder, Loc);

if (DebugKind <= codegenoptions::DebugLineTablesOnly)
  return;

LexicalBlockStack.pop_back();
4134}

4136void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((void)0);
unsigned RCount = FnBeginRegionCount.back();
assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch")((void)0);

// Pop all regions for this function.
while (LexicalBlockStack.size() != RCount) {
  // Provide an entry in the line table for the end of the block.
  EmitLocation(Builder, CurLoc);
  LexicalBlockStack.pop_back();
}
FnBeginRegionCount.pop_back();

if (Fn && Fn->getSubprogram())
  DBuilder.finalizeSubprogram(Fn->getSubprogram());
4151}

4153CGDebugInfo::BlockByRefType
4154CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
                                        uint64_t *XOffset) {
SmallVector<llvm::Metadata *, 5> EltTys;
QualType FType;
uint64_t FieldSize, FieldOffset;
uint32_t FieldAlign;

llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
QualType Type = VD->getType();

FieldOffset = 0;
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
FType = CGM.getContext().IntTy;
EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));

bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
if (HasCopyAndDispose) {
  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
  EltTys.push_back(
      CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
  EltTys.push_back(
      CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
}
bool HasByrefExtendedLayout;
Qualifiers::ObjCLifetime Lifetime;
if (CGM.getContext().getByrefLifetime(Type, Lifetime,
                                      HasByrefExtendedLayout) &&
    HasByrefExtendedLayout) {
  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
  EltTys.push_back(
      CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
}

CharUnits Align = CGM.getContext().getDeclAlign(VD);
if (Align > CGM.getContext().toCharUnitsFromBits(
                CGM.getTarget().getPointerAlign(0))) {
  CharUnits FieldOffsetInBytes =
      CGM.getContext().toCharUnitsFromBits(FieldOffset);
  CharUnits AlignedOffsetInBytes = FieldOffsetInBytes.alignTo(Align);
  CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;

  if (NumPaddingBytes.isPositive()) {
    llvm::APInt pad(32, NumPaddingBytes.getQuantity());
    FType = CGM.getContext().getConstantArrayType(
        CGM.getContext().CharTy, pad, nullptr, ArrayType::Normal, 0);
    EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
  }
}

FType = Type;
llvm::DIType *WrappedTy = getOrCreateType(FType, Unit);
FieldSize = CGM.getContext().getTypeSize(FType);
FieldAlign = CGM.getContext().toBits(Align);

*XOffset = FieldOffset;
llvm::DIType *FieldTy = DBuilder.createMemberType(
    Unit, VD->getName(), Unit, 0, FieldSize, FieldAlign, FieldOffset,
    llvm::DINode::FlagZero, WrappedTy);
EltTys.push_back(FieldTy);
FieldOffset += FieldSize;

llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
return {DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0,
                                  llvm::DINode::FlagZero, nullptr, Elements),
        WrappedTy};
4222}

4224llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
                                              llvm::Value *Storage,
                                              llvm::Optional<unsigned> ArgNo,
                                              CGBuilderTy &Builder,
                                              const bool UsePointerValue) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((void)0);
if (VD->hasAttr<NoDebugAttr>())
  return nullptr;

bool Unwritten =
    VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
                         cast<Decl>(VD->getDeclContext())->isImplicit());
llvm::DIFile *Unit = nullptr;
if (!Unwritten)
  Unit = getOrCreateFile(VD->getLocation());
llvm::DIType *Ty;
uint64_t XOffset = 0;
if (VD->hasAttr<BlocksAttr>())
  Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
else
  Ty = getOrCreateType(VD->getType(), Unit);

// If there is no debug info for this type then do not emit debug info
// for this variable.
if (!Ty)
  return nullptr;

// Get location information.
unsigned Line = 0;
unsigned Column = 0;
if (!Unwritten) {
  Line = getLineNumber(VD->getLocation());
  Column = getColumnNumber(VD->getLocation());
}
SmallVector<int64_t, 13> Expr;
llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
if (VD->isImplicit())
  Flags |= llvm::DINode::FlagArtificial;

auto Align = getDeclAlignIfRequired(VD, CGM.getContext());

unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(VD->getType());
AppendAddressSpaceXDeref(AddressSpace, Expr);

// If this is implicit parameter of CXXThis or ObjCSelf kind, then give it an
// object pointer flag.
if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD)) {
  if (IPD->getParameterKind() == ImplicitParamDecl::CXXThis ||
      IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
    Flags |= llvm::DINode::FlagObjectPointer;
}

// Note: Older versions of clang used to emit byval references with an extra
// DW_OP_deref, because they referenced the IR arg directly instead of
// referencing an alloca. Newer versions of LLVM don't treat allocas
// differently from other function arguments when used in a dbg.declare.
auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
StringRef Name = VD->getName();
if (!Name.empty()) {
  // __block vars are stored on the heap if they are captured by a block that
  // can escape the local scope.
  if (VD->isEscapingByref()) {
    // Here, we need an offset *into* the alloca.
    CharUnits offset = CharUnits::fromQuantity(32);
    Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
    // offset of __forwarding field
    offset = CGM.getContext().toCharUnitsFromBits(
        CGM.getTarget().getPointerWidth(0));
    Expr.push_back(offset.getQuantity());
    Expr.push_back(llvm::dwarf::DW_OP_deref);
    Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
    // offset of x field
    offset = CGM.getContext().toCharUnitsFromBits(XOffset);
    Expr.push_back(offset.getQuantity());
  }
} else if (const auto *RT = dyn_cast<RecordType>(VD->getType())) {
  // If VD is an anonymous union then Storage represents value for
  // all union fields.
  const RecordDecl *RD = RT->getDecl();
  if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
    // GDB has trouble finding local variables in anonymous unions, so we emit
    // artificial local variables for each of the members.
    //
    // FIXME: Remove this code as soon as GDB supports this.
    // The debug info verifier in LLVM operates based on the assumption that a
    // variable has the same size as its storage and we had to disable the
    // check for artificial variables.
    for (const auto *Field : RD->fields()) {
      llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
      StringRef FieldName = Field->getName();

      // Ignore unnamed fields. Do not ignore unnamed records.
      if (FieldName.empty() && !isa<RecordType>(Field->getType()))
        continue;

      // Use VarDecl's Tag, Scope and Line number.
      auto FieldAlign = getDeclAlignIfRequired(Field, CGM.getContext());
      auto *D = DBuilder.createAutoVariable(
          Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
          Flags | llvm::DINode::FlagArtificial, FieldAlign);

      // Insert an llvm.dbg.declare into the current block.
      DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
                             llvm::DILocation::get(CGM.getLLVMContext(), Line,
                                                   Column, Scope,
                                                   CurInlinedAt),
                             Builder.GetInsertBlock());
    }
  }
}

// Clang stores the sret pointer provided by the caller in a static alloca.
// Use DW_OP_deref to tell the debugger to load the pointer and treat it as
// the address of the variable.
if (UsePointerValue) {
  assert(std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) ==((void)0)
             Expr.end() &&((void)0)
         "Debug info already contains DW_OP_deref.")((void)0);
  Expr.push_back(llvm::dwarf::DW_OP_deref);
}

// Create the descriptor for the variable.
llvm::DILocalVariable *D = nullptr;
if (ArgNo) {
  D = DBuilder.createParameterVariable(Scope, Name, *ArgNo, Unit, Line, Ty,
                                       CGM.getLangOpts().Optimize, Flags);
} else {
  // For normal local variable, we will try to find out whether 'VD' is the
  // copy parameter of coroutine.
  // If yes, we are going to use DIVariable of the origin parameter instead
  // of creating the new one.
  // If no, it might be a normal alloc, we just create a new one for it.

  // Check whether the VD is move parameters.
  auto RemapCoroArgToLocalVar = [&]() -> llvm::DILocalVariable * {
    // The scope of parameter and move-parameter should be distinct
    // DISubprogram.
    if (!isa<llvm::DISubprogram>(Scope) || !Scope->isDistinct())
      return nullptr;

    auto Iter = llvm::find_if(CoroutineParameterMappings, [&](auto &Pair) {
      Stmt *StmtPtr = const_cast<Stmt *>(Pair.second);
      if (DeclStmt *DeclStmtPtr = dyn_cast<DeclStmt>(StmtPtr)) {
        DeclGroupRef DeclGroup = DeclStmtPtr->getDeclGroup();
        Decl *Decl = DeclGroup.getSingleDecl();
        if (VD == dyn_cast_or_null<VarDecl>(Decl))
          return true;
      }
      return false;
    });

    if (Iter != CoroutineParameterMappings.end()) {
      ParmVarDecl *PD = const_cast<ParmVarDecl *>(Iter->first);
      auto Iter2 = llvm::find_if(ParamDbgMappings, [&](auto &DbgPair) {
        return DbgPair.first == PD && DbgPair.second->getScope() == Scope;
      });
      if (Iter2 != ParamDbgMappings.end())
        return const_cast<llvm::DILocalVariable *>(Iter2->second);
    }
    return nullptr;
  };

  // If we couldn't find a move param DIVariable, create a new one.
  D = RemapCoroArgToLocalVar();
  // Or we will create a new DIVariable for this Decl if D dose not exists.
  if (!D)
    D = DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
                                    CGM.getLangOpts().Optimize, Flags, Align);
}
// Insert an llvm.dbg.declare into the current block.
DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
                       llvm::DILocation::get(CGM.getLLVMContext(), Line,
                                             Column, Scope, CurInlinedAt),
                       Builder.GetInsertBlock());

return D;
4401}

4403llvm::DILocalVariable *
4404CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
                                     CGBuilderTy &Builder,
                                     const bool UsePointerValue) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
return EmitDeclare(VD, Storage, llvm::None, Builder, UsePointerValue);
4409}

4411void CGDebugInfo::EmitLabel(const LabelDecl *D, CGBuilderTy &Builder) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((void)0);

if (D->hasAttr<NoDebugAttr>())
  return;

auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
llvm::DIFile *Unit = getOrCreateFile(D->getLocation());

// Get location information.
unsigned Line = getLineNumber(D->getLocation());
unsigned Column = getColumnNumber(D->getLocation());

StringRef Name = D->getName();

// Create the descriptor for the label.
auto *L =
    DBuilder.createLabel(Scope, Name, Unit, Line, CGM.getLangOpts().Optimize);

// Insert an llvm.dbg.label into the current block.
DBuilder.insertLabel(L,
                     llvm::DILocation::get(CGM.getLLVMContext(), Line, Column,
                                           Scope, CurInlinedAt),
                     Builder.GetInsertBlock());
4436}

4438llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
                                        llvm::DIType *Ty) {
llvm::DIType *CachedTy = getTypeOrNull(QualTy);
if (CachedTy)
  Ty = CachedTy;
return DBuilder.createObjectPointerType(Ty);
4444}

4446void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
  const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
  const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((void)0);

if (Builder.GetInsertBlock() == nullptr)
  return;
if (VD->hasAttr<NoDebugAttr>())
  return;

bool isByRef = VD->hasAttr<BlocksAttr>();

uint64_t XOffset = 0;
llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
llvm::DIType *Ty;
if (isByRef)
  Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
else
  Ty = getOrCreateType(VD->getType(), Unit);

// Self is passed along as an implicit non-arg variable in a
// block. Mark it as the object pointer.
if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD))
  if (IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
    Ty = CreateSelfType(VD->getType(), Ty);

// Get location information.
const unsigned Line =
    getLineNumber(VD->getLocation().isValid() ? VD->getLocation() : CurLoc);
unsigned Column = getColumnNumber(VD->getLocation());

const llvm::DataLayout &target = CGM.getDataLayout();

CharUnits offset = CharUnits::fromQuantity(
    target.getStructLayout(blockInfo.StructureType)
        ->getElementOffset(blockInfo.getCapture(VD).getIndex()));

SmallVector<int64_t, 9> addr;
addr.push_back(llvm::dwarf::DW_OP_deref);
addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
addr.push_back(offset.getQuantity());
if (isByRef) {
  addr.push_back(llvm::dwarf::DW_OP_deref);
  addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
  // offset of __forwarding field
  offset =
      CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
  addr.push_back(offset.getQuantity());
  addr.push_back(llvm::dwarf::DW_OP_deref);
  addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
  // offset of x field
  offset = CGM.getContext().toCharUnitsFromBits(XOffset);
  addr.push_back(offset.getQuantity());
}

// Create the descriptor for the variable.
auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
auto *D = DBuilder.createAutoVariable(
    cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
    Line, Ty, false, llvm::DINode::FlagZero, Align);

// Insert an llvm.dbg.declare into the current block.
auto DL = llvm::DILocation::get(CGM.getLLVMContext(), Line, Column,
                                LexicalBlockStack.back(), CurInlinedAt);
auto *Expr = DBuilder.createExpression(addr);
if (InsertPoint)
  DBuilder.insertDeclare(Storage, D, Expr, DL, InsertPoint);
else
  DBuilder.insertDeclare(Storage, D, Expr, DL, Builder.GetInsertBlock());
4516}

4518llvm::DILocalVariable *
4519CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
                                    unsigned ArgNo, CGBuilderTy &Builder) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
return EmitDeclare(VD, AI, ArgNo, Builder);
4523}

4525namespace {
4526struct BlockLayoutChunk {
uint64_t OffsetInBits;
const BlockDecl::Capture *Capture;
4529};
4530bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
return l.OffsetInBits < r.OffsetInBits;
4532}
4533} // namespace

4535void CGDebugInfo::collectDefaultFieldsForBlockLiteralDeclare(
  const CGBlockInfo &Block, const ASTContext &Context, SourceLocation Loc,
  const llvm::StructLayout &BlockLayout, llvm::DIFile *Unit,
  SmallVectorImpl<llvm::Metadata *> &Fields) {
// Blocks in OpenCL have unique constraints which make the standard fields
// redundant while requiring size and align fields for enqueue_kernel. See
// initializeForBlockHeader in CGBlocks.cpp
if (CGM.getLangOpts().OpenCL) {
  Fields.push_back(createFieldType("__size", Context.IntTy, Loc, AS_public,
                                   BlockLayout.getElementOffsetInBits(0),
                                   Unit, Unit));
  Fields.push_back(createFieldType("__align", Context.IntTy, Loc, AS_public,
                                   BlockLayout.getElementOffsetInBits(1),
                                   Unit, Unit));
} else {
  Fields.push_back(createFieldType("__isa", Context.VoidPtrTy, Loc, AS_public,
                                   BlockLayout.getElementOffsetInBits(0),
                                   Unit, Unit));
  Fields.push_back(createFieldType("__flags", Context.IntTy, Loc, AS_public,
                                   BlockLayout.getElementOffsetInBits(1),
                                   Unit, Unit));
  Fields.push_back(
      createFieldType("__reserved", Context.IntTy, Loc, AS_public,
                      BlockLayout.getElementOffsetInBits(2), Unit, Unit));
  auto *FnTy = Block.getBlockExpr()->getFunctionType();
  auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
  Fields.push_back(createFieldType("__FuncPtr", FnPtrType, Loc, AS_public,
                                   BlockLayout.getElementOffsetInBits(3),
                                   Unit, Unit));
  Fields.push_back(createFieldType(
      "__descriptor",
      Context.getPointerType(Block.NeedsCopyDispose
                                 ? Context.getBlockDescriptorExtendedType()
                                 : Context.getBlockDescriptorType()),
      Loc, AS_public, BlockLayout.getElementOffsetInBits(4), Unit, Unit));
}
4571}

4573void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
                                                     StringRef Name,
                                                     unsigned ArgNo,
                                                     llvm::AllocaInst *Alloca,
                                                     CGBuilderTy &Builder) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
ASTContext &C = CGM.getContext();
const BlockDecl *blockDecl = block.getBlockDecl();

// Collect some general information about the block's location.
SourceLocation loc = blockDecl->getCaretLocation();
llvm::DIFile *tunit = getOrCreateFile(loc);
unsigned line = getLineNumber(loc);
unsigned column = getColumnNumber(loc);

// Build the debug-info type for the block literal.
getDeclContextDescriptor(blockDecl);

const llvm::StructLayout *blockLayout =
    CGM.getDataLayout().getStructLayout(block.StructureType);

SmallVector<llvm::Metadata *, 16> fields;
collectDefaultFieldsForBlockLiteralDeclare(block, C, loc, *blockLayout, tunit,
                                           fields);

// We want to sort the captures by offset, not because DWARF
// requires this, but because we're paranoid about debuggers.
SmallVector<BlockLayoutChunk, 8> chunks;

// 'this' capture.
if (blockDecl->capturesCXXThis()) {
  BlockLayoutChunk chunk;
  chunk.OffsetInBits =
      blockLayout->getElementOffsetInBits(block.CXXThisIndex);
  chunk.Capture = nullptr;
  chunks.push_back(chunk);
}

// Variable captures.
for (const auto &capture : blockDecl->captures()) {
  const VarDecl *variable = capture.getVariable();
  const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);

  // Ignore constant captures.
  if (captureInfo.isConstant())
    continue;

  BlockLayoutChunk chunk;
  chunk.OffsetInBits =
      blockLayout->getElementOffsetInBits(captureInfo.getIndex());
  chunk.Capture = &capture;
  chunks.push_back(chunk);
}

// Sort by offset.
llvm::array_pod_sort(chunks.begin(), chunks.end());

for (const BlockLayoutChunk &Chunk : chunks) {
  uint64_t offsetInBits = Chunk.OffsetInBits;
  const BlockDecl::Capture *capture = Chunk.Capture;

  // If we have a null capture, this must be the C++ 'this' capture.
  if (!capture) {
    QualType type;
    if (auto *Method =
            cast_or_null<CXXMethodDecl>(blockDecl->getNonClosureContext()))
      type = Method->getThisType();
    else if (auto *RDecl = dyn_cast<CXXRecordDecl>(blockDecl->getParent()))
      type = QualType(RDecl->getTypeForDecl(), 0);
    else
      llvm_unreachable("unexpected block declcontext")__builtin_unreachable();

    fields.push_back(createFieldType("this", type, loc, AS_public,
                                     offsetInBits, tunit, tunit));
    continue;
  }

  const VarDecl *variable = capture->getVariable();
  StringRef name = variable->getName();

  llvm::DIType *fieldType;
  if (capture->isByRef()) {
    TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
    auto Align = PtrInfo.AlignIsRequired ? PtrInfo.Align : 0;
    // FIXME: This recomputes the layout of the BlockByRefWrapper.
    uint64_t xoffset;
    fieldType =
        EmitTypeForVarWithBlocksAttr(variable, &xoffset).BlockByRefWrapper;
    fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
    fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
                                          PtrInfo.Width, Align, offsetInBits,
                                          llvm::DINode::FlagZero, fieldType);
  } else {
    auto Align = getDeclAlignIfRequired(variable, CGM.getContext());
    fieldType = createFieldType(name, variable->getType(), loc, AS_public,
                                offsetInBits, Align, tunit, tunit);
  }
  fields.push_back(fieldType);
}

SmallString<36> typeName;
llvm::raw_svector_ostream(typeName)
    << "__block_literal_" << CGM.getUniqueBlockCount();

llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);

llvm::DIType *type =
    DBuilder.createStructType(tunit, typeName.str(), tunit, line,
                              CGM.getContext().toBits(block.BlockSize), 0,
                              llvm::DINode::FlagZero, nullptr, fieldsArray);
type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);

// Get overall information about the block.
llvm::DINode::DIFlags flags = llvm::DINode::FlagArtificial;
auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());

// Create the descriptor for the parameter.
auto *debugVar = DBuilder.createParameterVariable(
    scope, Name, ArgNo, tunit, line, type, CGM.getLangOpts().Optimize, flags);

// Insert an llvm.dbg.declare into the current block.
DBuilder.insertDeclare(Alloca, debugVar, DBuilder.createExpression(),
                       llvm::DILocation::get(CGM.getLLVMContext(), line,
                                             column, scope, CurInlinedAt),
                       Builder.GetInsertBlock());
4698}

4700llvm::DIDerivedType *
4701CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
if (!D || !D->isStaticDataMember())
  return nullptr;

auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
if (MI != StaticDataMemberCache.end()) {
  assert(MI->second && "Static data member declaration should still exist")((void)0);
  return MI->second;
}

// If the member wasn't found in the cache, lazily construct and add it to the
// type (used when a limited form of the type is emitted).
auto DC = D->getDeclContext();
auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
4716}

4718llvm::DIGlobalVariableExpression *CGDebugInfo::CollectAnonRecordDecls(
  const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
  StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
llvm::DIGlobalVariableExpression *GVE = nullptr;

for (const auto *Field : RD->fields()) {
  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
  StringRef FieldName = Field->getName();

  // Ignore unnamed fields, but recurse into anonymous records.
  if (FieldName.empty()) {
    if (const auto *RT = dyn_cast<RecordType>(Field->getType()))
      GVE = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
                                   Var, DContext);
    continue;
  }
  // Use VarDecl's Tag, Scope and Line number.
  GVE = DBuilder.createGlobalVariableExpression(
      DContext, FieldName, LinkageName, Unit, LineNo, FieldTy,
      Var->hasLocalLinkage());
  Var->addDebugInfo(GVE);
}
return GVE;
4741}

4743std::string CGDebugInfo::GetName(const Decl *D, bool Qualified) const {
std::string Name;
llvm::raw_string_ostream OS(Name);
if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) {
  PrintingPolicy PP = getPrintingPolicy();
  PP.PrintCanonicalTypes = true;
  PP.SuppressInlineNamespace = false;
  ND->getNameForDiagnostic(OS, PP, Qualified);
}
return Name;
4753}

4755void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
                                   const VarDecl *D) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
if (D->hasAttr<NoDebugAttr>())
  return;

llvm::TimeTraceScope TimeScope("DebugGlobalVariable", [&]() {
  return GetName(D, true);
});

// If we already created a DIGlobalVariable for this declaration, just attach
// it to the llvm::GlobalVariable.
auto Cached = DeclCache.find(D->getCanonicalDecl());
if (Cached != DeclCache.end())
  return Var->addDebugInfo(
      cast<llvm::DIGlobalVariableExpression>(Cached->second));

// Create global variable debug descriptor.
llvm::DIFile *Unit = nullptr;
llvm::DIScope *DContext = nullptr;
unsigned LineNo;
StringRef DeclName, LinkageName;
QualType T;
llvm::MDTuple *TemplateParameters = nullptr;
collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName,
                    TemplateParameters, DContext);

// Attempt to store one global variable for the declaration - even if we
// emit a lot of fields.
llvm::DIGlobalVariableExpression *GVE = nullptr;

// If this is an anonymous union then we'll want to emit a global
// variable for each member of the anonymous union so that it's possible
// to find the name of any field in the union.
if (T->isUnionType() && DeclName.empty()) {
  const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
  assert(RD->isAnonymousStructOrUnion() &&((void)0)
         "unnamed non-anonymous struct or union?")((void)0);
  GVE = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
} else {
  auto Align = getDeclAlignIfRequired(D, CGM.getContext());

  SmallVector<int64_t, 4> Expr;
  unsigned AddressSpace =
      CGM.getContext().getTargetAddressSpace(D->getType());
  if (CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) {
    if (D->hasAttr<CUDASharedAttr>())
      AddressSpace =
          CGM.getContext().getTargetAddressSpace(LangAS::cuda_shared);
    else if (D->hasAttr<CUDAConstantAttr>())
      AddressSpace =
          CGM.getContext().getTargetAddressSpace(LangAS::cuda_constant);
  }
  AppendAddressSpaceXDeref(AddressSpace, Expr);

  GVE = DBuilder.createGlobalVariableExpression(
      DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
      Var->hasLocalLinkage(), true,
      Expr.empty() ? nullptr : DBuilder.createExpression(Expr),
      getOrCreateStaticDataMemberDeclarationOrNull(D), TemplateParameters,
      Align);
  Var->addDebugInfo(GVE);
}
DeclCache[D->getCanonicalDecl()].reset(GVE);
4819}

4821void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
if (VD->hasAttr<NoDebugAttr>())
  return;
llvm::TimeTraceScope TimeScope("DebugConstGlobalVariable", [&]() {
  return GetName(VD, true);
});

auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
// Create the descriptor for the variable.
llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
StringRef Name = VD->getName();
llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);

if (const auto *ECD = dyn_cast<EnumConstantDecl>(VD)) {
  const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
  assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?")((void)0);

  if (CGM.getCodeGenOpts().EmitCodeView) {
    // If CodeView, emit enums as global variables, unless they are defined
    // inside a class. We do this because MSVC doesn't emit S_CONSTANTs for
    // enums in classes, and because it is difficult to attach this scope
    // information to the global variable.
    if (isa<RecordDecl>(ED->getDeclContext()))
      return;
  } else {
    // If not CodeView, emit DW_TAG_enumeration_type if necessary. For
    // example: for "enum { ZERO };", a DW_TAG_enumeration_type is created the
    // first time `ZERO` is referenced in a function.
    llvm::DIType *EDTy =
        getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
    assert (EDTy->getTag() == llvm::dwarf::DW_TAG_enumeration_type)((void)0);
    (void)EDTy;
    return;
  }
}

// Do not emit separate definitions for function local consts.
if (isa<FunctionDecl>(VD->getDeclContext()))
  return;

VD = cast<ValueDecl>(VD->getCanonicalDecl());
auto *VarD = dyn_cast<VarDecl>(VD);
if (VarD && VarD->isStaticDataMember()) {
  auto *RD = cast<RecordDecl>(VarD->getDeclContext());
  getDeclContextDescriptor(VarD);
  // Ensure that the type is retained even though it's otherwise unreferenced.
  //
  // FIXME: This is probably unnecessary, since Ty should reference RD
  // through its scope.
  RetainedTypes.push_back(
      CGM.getContext().getRecordType(RD).getAsOpaquePtr());

  return;
}
llvm::DIScope *DContext = getDeclContextDescriptor(VD);

auto &GV = DeclCache[VD];
if (GV)
  return;
llvm::DIExpression *InitExpr = nullptr;
if (CGM.getContext().getTypeSize(VD->getType()) <= 64) {
  // FIXME: Add a representation for integer constants wider than 64 bits.
  if (Init.isInt())
    InitExpr =
        DBuilder.createConstantValueExpression(Init.getInt().getExtValue());
  else if (Init.isFloat())
    InitExpr = DBuilder.createConstantValueExpression(
        Init.getFloat().bitcastToAPInt().getZExtValue());
}

llvm::MDTuple *TemplateParameters = nullptr;

if (isa<VarTemplateSpecializationDecl>(VD))
  if (VarD) {
    llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VarD, &*Unit);
    TemplateParameters = parameterNodes.get();
  }

GV.reset(DBuilder.createGlobalVariableExpression(
    DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
    true, true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
    TemplateParameters, Align));
4904}

4906void CGDebugInfo::EmitExternalVariable(llvm::GlobalVariable *Var,
                                     const VarDecl *D) {
assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((void)0);
if (D->hasAttr<NoDebugAttr>())
  return;

auto Align = getDeclAlignIfRequired(D, CGM.getContext());
llvm::DIFile *Unit = getOrCreateFile(D->getLocation());
StringRef Name = D->getName();
llvm::DIType *Ty = getOrCreateType(D->getType(), Unit);

llvm::DIScope *DContext = getDeclContextDescriptor(D);
llvm::DIGlobalVariableExpression *GVE =
    DBuilder.createGlobalVariableExpression(
        DContext, Name, StringRef(), Unit, getLineNumber(D->getLocation()),
        Ty, false, false, nullptr, nullptr, nullptr, Align);
Var->addDebugInfo(GVE);
4923}

4925llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
if (!LexicalBlockStack.empty())
  return LexicalBlockStack.back();
llvm::DIScope *Mod = getParentModuleOrNull(D);
return getContextDescriptor(D, Mod ? Mod : TheCU);
4930}

4932void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
  return;
const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
if (!NSDecl->isAnonymousNamespace() ||
    CGM.getCodeGenOpts().DebugExplicitImport) {
  auto Loc = UD.getLocation();
  if (!Loc.isValid())
    Loc = CurLoc;
  DBuilder.createImportedModule(
      getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
      getOrCreateNamespace(NSDecl), getOrCreateFile(Loc), getLineNumber(Loc));
}
4945}

4947void CGDebugInfo::EmitUsingShadowDecl(const UsingShadowDecl &USD) {
if (llvm::DINode *Target =
        getDeclarationOrDefinition(USD.getUnderlyingDecl())) {
  auto Loc = USD.getLocation();
  DBuilder.createImportedDeclaration(
      getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
      getOrCreateFile(Loc), getLineNumber(Loc));
}
4955}

4957void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
  return;
assert(UD.shadow_size() &&((void)0)
       "We shouldn't be codegening an invalid UsingDecl containing no decls")((void)0);

for (const auto *USD : UD.shadows()) {
  // FIXME: Skip functions with undeduced auto return type for now since we
  // don't currently have the plumbing for separate declarations & definitions
  // of free functions and mismatched types (auto in the declaration, concrete
  // return type in the definition)
  if (const auto *FD = dyn_cast<FunctionDecl>(USD->getUnderlyingDecl()))
    if (const auto *AT = FD->getType()
                             ->castAs<FunctionProtoType>()
                             ->getContainedAutoType())
      if (AT->getDeducedType().isNull())
        continue;

  EmitUsingShadowDecl(*USD);
  // Emitting one decl is sufficient - debuggers can detect that this is an
  // overloaded name & provide lookup for all the overloads.
  break;
}
4980}

4982void CGDebugInfo::EmitUsingEnumDecl(const UsingEnumDecl &UD) {
if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
  return;
assert(UD.shadow_size() &&((void)0)
       "We shouldn't be codegening an invalid UsingEnumDecl"((void)0)
       " containing no decls")((void)0);

for (const auto *USD : UD.shadows())
  EmitUsingShadowDecl(*USD);
4991}

4993void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
if (CGM.getCodeGenOpts().getDebuggerTuning() != llvm::DebuggerKind::LLDB)
  return;
if (Module *M = ID.getImportedModule()) {
  auto Info = ASTSourceDescriptor(*M);
  auto Loc = ID.getLocation();
  DBuilder.createImportedDeclaration(
      getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
      getOrCreateModuleRef(Info, DebugTypeExtRefs), getOrCreateFile(Loc),
      getLineNumber(Loc));
}
5004}

5006llvm::DIImportedEntity *
5007CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
  return nullptr;
auto &VH = NamespaceAliasCache[&NA];
if (VH)
  return cast<llvm::DIImportedEntity>(VH);
llvm::DIImportedEntity *R;
auto Loc = NA.getLocation();
if (const auto *Underlying =
        dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
  // This could cache & dedup here rather than relying on metadata deduping.
  R = DBuilder.createImportedDeclaration(
      getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
      EmitNamespaceAlias(*Underlying), getOrCreateFile(Loc),
      getLineNumber(Loc), NA.getName());
else
  R = DBuilder.createImportedDeclaration(
      getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
      getOrCreateNamespace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
      getOrCreateFile(Loc), getLineNumber(Loc), NA.getName());
VH.reset(R);
return R;
5029}

5031llvm::DINamespace *
5032CGDebugInfo::getOrCreateNamespace(const NamespaceDecl *NSDecl) {
// Don't canonicalize the NamespaceDecl here: The DINamespace will be uniqued
// if necessary, and this way multiple declarations of the same namespace in
// different parent modules stay distinct.
auto I = NamespaceCache.find(NSDecl);
if (I != NamespaceCache.end())
  return cast<llvm::DINamespace>(I->second);

llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
// Don't trust the context if it is a DIModule (see comment above).
llvm::DINamespace *NS =
    DBuilder.createNameSpace(Context, NSDecl->getName(), NSDecl->isInline());
NamespaceCache[NSDecl].reset(NS);
return NS;
5046}

5048void CGDebugInfo::setDwoId(uint64_t Signature) {
assert(TheCU && "no main compile unit")((void)0);
TheCU->setDWOId(Signature);
5051}

5053void CGDebugInfo::finalize() {
// Creating types might create further types - invalidating the current
// element and the size(), so don't cache/reference them.
for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
  ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
  llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
                         ? CreateTypeDefinition(E.Type, E.Unit)
                         : E.Decl;
  DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
}

// Add methods to interface.
for (const auto &P : ObjCMethodCache) {
  if (P.second.empty())
    continue;

  QualType QTy(P.first->getTypeForDecl(), 0);
  auto It = TypeCache.find(QTy.getAsOpaquePtr());
  assert(It != TypeCache.end())((void)0);

  llvm::DICompositeType *InterfaceDecl =
      cast<llvm::DICompositeType>(It->second);

  auto CurElts = InterfaceDecl->getElements();
  SmallVector<llvm::Metadata *, 16> EltTys(CurElts.begin(), CurElts.end());

  // For DWARF v4 or earlier, only add objc_direct methods.
  for (auto &SubprogramDirect : P.second)
    if (CGM.getCodeGenOpts().DwarfVersion >= 5 || SubprogramDirect.getInt())
      EltTys.push_back(SubprogramDirect.getPointer());

  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
  DBuilder.replaceArrays(InterfaceDecl, Elements);
}

for (const auto &P : ReplaceMap) {
  assert(P.second)((void)0);
  auto *Ty = cast<llvm::DIType>(P.second);
  assert(Ty->isForwardDecl())((void)0);

  auto It = TypeCache.find(P.first);
  assert(It != TypeCache.end())((void)0);
  assert(It->second)((void)0);

  DBuilder.replaceTemporary(llvm::TempDIType(Ty),
                            cast<llvm::DIType>(It->second));
}

for (const auto &P : FwdDeclReplaceMap) {
  assert(P.second)((void)0);
  llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(P.second));
  llvm::Metadata *Repl;

  auto It = DeclCache.find(P.first);
  // If there has been no definition for the declaration, call RAUW
  // with ourselves, that will destroy the temporary MDNode and
  // replace it with a standard one, avoiding leaking memory.
  if (It == DeclCache.end())
    Repl = P.second;
  else
    Repl = It->second;

  if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(Repl))
    Repl = GVE->getVariable();
  DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
}

// We keep our own list of retained types, because we need to look
// up the final type in the type cache.
for (auto &RT : RetainedTypes)
  if (auto MD = TypeCache[RT])
    DBuilder.retainType(cast<llvm::DIType>(MD));

DBuilder.finalize();
5127}

5129// Don't ignore in case of explicit cast where it is referenced indirectly.
5130void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
if (CGM.getCodeGenOpts().hasReducedDebugInfo())
  if (auto *DieTy = getOrCreateType(Ty, TheCU->getFile()))
    DBuilder.retainType(DieTy);
5134}

5136void CGDebugInfo::EmitAndRetainType(QualType Ty) {
if (CGM.getCodeGenOpts().hasMaybeUnusedDebugInfo())
  if (auto *DieTy = getOrCreateType(Ty, TheCU->getFile()))
    DBuilder.retainType(DieTy);
5140}

5142llvm::DebugLoc CGDebugInfo::SourceLocToDebugLoc(SourceLocation Loc) {
if (LexicalBlockStack.empty())
  return llvm::DebugLoc();

llvm::MDNode *Scope = LexicalBlockStack.back();
return llvm::DILocation::get(CGM.getLLVMContext(), getLineNumber(Loc),
                             getColumnNumber(Loc), Scope);
5149}

5151llvm::DINode::DIFlags CGDebugInfo::getCallSiteRelatedAttrs() const {
// Call site-related attributes are only useful in optimized programs, and
// when there's a possibility of debugging backtraces.
if (!CGM.getLangOpts().Optimize || DebugKind == codegenoptions::NoDebugInfo ||
    DebugKind == codegenoptions::LocTrackingOnly)
  return llvm::DINode::FlagZero;

// Call site-related attributes are available in DWARF v5. Some debuggers,
// while not fully DWARF v5-compliant, may accept these attributes as if they
// were part of DWARF v4.
bool SupportsDWARFv4Ext =
    CGM.getCodeGenOpts().DwarfVersion == 4 &&
    (CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::LLDB ||
     CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::GDB);

if (!SupportsDWARFv4Ext && CGM.getCodeGenOpts().DwarfVersion < 5)
  return llvm::DINode::FlagZero;

return llvm::DINode::FlagAllCallsDescribed;
5170}