/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp

Bug Summary

File:	tools/clang/lib/CodeGen/CGDebugInfo.cpp
Warning:	line 633, column 7 Null pointer passed as an argument to a 'nonnull' parameter

Annotated Source Code

Press '?' to see keyboard shortcuts

Show analyzer invocation

clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGDebugInfo.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -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 -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326551/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/lib/CodeGen -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-03-02-155150-1477-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp

/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp

→

1//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This coordinates the debug information generation while generating code.
11//
12//===----------------------------------------------------------------------===//

14#include "CGDebugInfo.h"
15#include "CGBlocks.h"
16#include "CGCXXABI.h"
17#include "CGObjCRuntime.h"
18#include "CGRecordLayout.h"
19#include "CodeGenFunction.h"
20#include "CodeGenModule.h"
21#include "ConstantEmitter.h"
22#include "clang/AST/ASTContext.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/FileManager.h"
29#include "clang/Basic/SourceManager.h"
30#include "clang/Basic/Version.h"
31#include "clang/Frontend/CodeGenOptions.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/Module.h"
45#include "llvm/Support/FileSystem.h"
46#include "llvm/Support/MD5.h"
47#include "llvm/Support/Path.h"
48using namespace clang;
49using namespace clang::CodeGen;

51static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
auto TI = Ctx.getTypeInfo(Ty);
return TI.AlignIsRequired ? TI.Align : 0;
54}

56static uint32_t getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
58}

60static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
62}

64CGDebugInfo::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();
71}

73CGDebugInfo::~CGDebugInfo() {
assert(LexicalBlockStack.empty() &&(static_cast <bool> (LexicalBlockStack.empty() &&
 "Region stack mismatch, stack not empty!") ? void (0) : __assert_fail
 ("LexicalBlockStack.empty() && \"Region stack mismatch, stack not empty!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 75, __extension__ __PRETTY_FUNCTION__))
       "Region stack mismatch, stack not empty!")(static_cast <bool> (LexicalBlockStack.empty() &&
 "Region stack mismatch, stack not empty!") ? void (0) : __assert_fail
 ("LexicalBlockStack.empty() && \"Region stack mismatch, stack not empty!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 75, __extension__ __PRETTY_FUNCTION__));
76}

78ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
                                     SourceLocation TemporaryLocation)
  : CGF(&CGF) {
init(TemporaryLocation);
82}

84ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
                                     bool DefaultToEmpty,
                                     SourceLocation TemporaryLocation)
  : CGF(&CGF) {
init(TemporaryLocation, DefaultToEmpty);
89}

91void 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())(static_cast <bool> (!DI->LexicalBlockStack.empty())
 ? void (0) : __assert_fail ("!DI->LexicalBlockStack.empty()"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 115, __extension__ __PRETTY_FUNCTION__));
CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
    0, 0, DI->LexicalBlockStack.back(), DI->getInlinedAt()));
118}

120ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
  : CGF(&CGF) {
init(E->getExprLoc());
123}

125ApplyDebugLocation::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));
134}

136ApplyDebugLocation::~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));
141}

143ApplyInlineDebugLocation::ApplyInlineDebugLocation(CodeGenFunction &CGF,
                                                 GlobalDecl InlinedFn)
  : CGF(&CGF) {
if (!CGF.getDebugInfo()) {
  this->CGF = nullptr;
  return;
}
auto &DI = *CGF.getDebugInfo();
SavedLocation = DI.getLocation();
assert((DI.getInlinedAt() ==(static_cast <bool> ((DI.getInlinedAt() == CGF.Builder.
getCurrentDebugLocation()->getInlinedAt()) && "CGDebugInfo and IRBuilder are out of sync"
) ? void (0) : __assert_fail ("(DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) && \"CGDebugInfo and IRBuilder are out of sync\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 154, __extension__ __PRETTY_FUNCTION__))
        CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) &&(static_cast <bool> ((DI.getInlinedAt() == CGF.Builder.
getCurrentDebugLocation()->getInlinedAt()) && "CGDebugInfo and IRBuilder are out of sync"
) ? void (0) : __assert_fail ("(DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) && \"CGDebugInfo and IRBuilder are out of sync\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 154, __extension__ __PRETTY_FUNCTION__))
       "CGDebugInfo and IRBuilder are out of sync")(static_cast <bool> ((DI.getInlinedAt() == CGF.Builder.
getCurrentDebugLocation()->getInlinedAt()) && "CGDebugInfo and IRBuilder are out of sync"
) ? void (0) : __assert_fail ("(DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) && \"CGDebugInfo and IRBuilder are out of sync\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 154, __extension__ __PRETTY_FUNCTION__));

DI.EmitInlineFunctionStart(CGF.Builder, InlinedFn);
157}

159ApplyInlineDebugLocation::~ApplyInlineDebugLocation() {
if (!CGF)
  return;
auto &DI = *CGF->getDebugInfo();
DI.EmitInlineFunctionEnd(CGF->Builder);
DI.EmitLocation(CGF->Builder, SavedLocation);
165}

167void 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->getFilename() == PCLoc.getFilename())
  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)));
}
197}

199llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
llvm::DIScope *Mod = getParentModuleOrNull(D);
return getContextDescriptor(cast<Decl>(D->getDeclContext()),
                            Mod ? Mod : TheCU);
203}

205llvm::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),
                           getOrCreateMainFile());
return Default;
225}

227PrintingPolicy 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.
if (CGM.getCodeGenOpts().EmitCodeView)
  PP.MSVCFormatting = true;

return PP;
238}

240StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
assert(FD && "Invalid FunctionDecl!")(static_cast <bool> (FD && "Invalid FunctionDecl!"
) ? void (0) : __assert_fail ("FD && \"Invalid FunctionDecl!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 241, __extension__ __PRETTY_FUNCTION__));
IdentifierInfo *FII = FD->getIdentifier();
FunctionTemplateSpecializationInfo *Info =
    FD->getTemplateSpecializationInfo();

// Emit the unqualified name in normal operation. LLVM and the debugger can
// compute the fully qualified name from the scope chain. If we're only
// emitting line table info, there won't be any scope chains, so emit the
// fully qualified name here so that stack traces are more accurate.
// FIXME: Do this when emitting DWARF as well as when emitting CodeView after
// evaluating the size impact.
bool UseQualifiedName = DebugKind == codegenoptions::DebugLineTablesOnly &&
                        CGM.getCodeGenOpts().EmitCodeView;

if (!Info && FII && !UseQualifiedName)
  return FII->getName();

SmallString<128> NS;
llvm::raw_svector_ostream OS(NS);
if (!UseQualifiedName)
  FD->printName(OS);
else
  FD->printQualifiedName(OS, getPrintingPolicy());

// Add any template specialization args.
if (Info) {
  const TemplateArgumentList *TArgs = Info->TemplateArguments;
  printTemplateArgumentList(OS, TArgs->asArray(), getPrintingPolicy());
}

// Copy this name on the side and use its reference.
return internString(OS.str());
273}

275StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
SmallString<256> MethodName;
llvm::raw_svector_ostream OS(MethodName);
OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
7
←
Assuming the condition is false→
8
←
'?' condition is false→
const DeclContext *DC = OMD->getDeclContext();
if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {
9
←
Taking false branch→
  OS << OID->getName();
} else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {
10
←
Assuming 'OID' is non-null→
11
←
Taking true branch→
  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() << ')';
} else if (isa<ObjCProtocolDecl>(DC)) {
  // We can extract the type of the class from the self pointer.
  if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
    QualType ClassTy =
        cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
    ClassTy.print(OS, PrintingPolicy(LangOptions()));
  }
}
OS << ' ' << OMD->getSelector().getAsString() << ']';

return internString(OS.str());
12
←
Calling 'CGDebugInfo::internString'→
305}

307StringRef CGDebugInfo::getSelectorName(Selector S) {
return internString(S.getAsString());
309}

311StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
if (isa<ClassTemplateSpecializationDecl>(RD)) {
  SmallString<128> Name;
  llvm::raw_svector_ostream OS(Name);
  RD->getNameForDiagnostic(OS, getPrintingPolicy(),
                           /*Qualified*/ false);

  // Copy this name on the side and use its reference.
  return internString(Name);
}

// 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: it is
// used to reconstruct the fully qualified type names.
if (CGM.getCodeGenOpts().EmitCodeView) {
  if (const TypedefNameDecl *D = RD->getTypedefNameForAnonDecl()) {
    assert(RD->getDeclContext() == D->getDeclContext() &&(static_cast <bool> (RD->getDeclContext() == D->getDeclContext
() && "Typedef should not be in another decl context!"
) ? void (0) : __assert_fail ("RD->getDeclContext() == D->getDeclContext() && \"Typedef should not be in another decl context!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 332, __extension__ __PRETTY_FUNCTION__))
           "Typedef should not be in another decl context!")(static_cast <bool> (RD->getDeclContext() == D->getDeclContext
() && "Typedef should not be in another decl context!"
) ? void (0) : __assert_fail ("RD->getDeclContext() == D->getDeclContext() && \"Typedef should not be in another decl context!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 332, __extension__ __PRETTY_FUNCTION__));
    assert(D->getDeclName().getAsIdentifierInfo() &&(static_cast <bool> (D->getDeclName().getAsIdentifierInfo
() && "Typedef was not named!") ? void (0) : __assert_fail
 ("D->getDeclName().getAsIdentifierInfo() && \"Typedef was not named!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 334, __extension__ __PRETTY_FUNCTION__))
           "Typedef was not named!")(static_cast <bool> (D->getDeclName().getAsIdentifierInfo
() && "Typedef was not named!") ? void (0) : __assert_fail
 ("D->getDeclName().getAsIdentifierInfo() && \"Typedef was not named!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 334, __extension__ __PRETTY_FUNCTION__));
    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();

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

return StringRef();
362}

364Optional<llvm::DIFile::ChecksumKind>
365CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
Checksum.clear();

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

SourceManager &SM = CGM.getContext().getSourceManager();
bool Invalid;
llvm::MemoryBuffer *MemBuffer = SM.getBuffer(FID, &Invalid);
if (Invalid)
  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;
386}

388Optional<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;
399}

401llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
if (!Loc.isValid())
  // If Location is not valid then use main input file.
  return getOrCreateMainFile();

SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc);

if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
  // If the location is not valid then use main input file.
  return getOrCreateMainFile();

// Cache the results.
const char *fname = PLoc.getFilename();
auto it = DIFileCache.find(fname);

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(SM.getFileID(Loc), Checksum);
Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;
if (CSKind)
  CSInfo.emplace(*CSKind, Checksum);

llvm::DIFile *F = DBuilder.createFile(remapDIPath(PLoc.getFilename()),
                                      remapDIPath(getCurrentDirname()),
                                      CSInfo,
                                      getSource(SM, SM.getFileID(Loc)));

DIFileCache[fname].reset(F);
return F;
437}

439llvm::DIFile *CGDebugInfo::getOrCreateMainFile() {
return DBuilder.createFile(
    remapDIPath(TheCU->getFilename()),
    remapDIPath(TheCU->getDirectory()),
    TheCU->getFile()->getChecksum(),
    CGM.getCodeGenOpts().EmbedSource ? TheCU->getSource() : None);
445}

447std::string CGDebugInfo::remapDIPath(StringRef Path) const {
for (const auto &Entry : DebugPrefixMap)
  if (Path.startswith(Entry.first))
    return (Twine(Entry.second) + Path.substr(Entry.first.size())).str();
return Path.str();
452}

454unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
if (Loc.isInvalid() && CurLoc.isInvalid())
  return 0;
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
return PLoc.isValid() ? PLoc.getLine() : 0;
460}

462unsigned 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;
473}

475StringRef 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);
484}

486void 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 = remapDIPath(MainFile->getDir()->getName());
  if (MainFileDir != ".") {
    llvm::SmallString<1024> MainFileDirSS(MainFileDir);
    llvm::sys::path::append(MainFileDirSS, MainFileName);
    MainFileName = MainFileDirSS.str();
  }
  // 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.ObjC1)
    LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
  else
    LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
} else if (LO.ObjC1) {
  LangTag = llvm::dwarf::DW_LANG_ObjC;
} 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.ObjC1)
  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::LimitedDebugInfo:
case codegenoptions::FullDebugInfo:
  EmissionKind = llvm::DICompileUnit::FullDebug;
  break;
}

if (CSKind)
  CSInfo.emplace(*CSKind, Checksum);

// Create new compile unit.
// FIXME - Eliminate TheCU.
auto &CGOpts = CGM.getCodeGenOpts();
TheCU = DBuilder.createCompileUnit(
    LangTag,
    DBuilder.createFile(remapDIPath(MainFileName),
                        remapDIPath(getCurrentDirname()),
                        CSInfo,
                        getSource(SM, SM.getMainFileID())),
    Producer, LO.Optimize || CGOpts.PrepareForLTO || CGOpts.EmitSummaryIndex,
    CGOpts.DwarfDebugFlags, RuntimeVers,
    CGOpts.EnableSplitDwarf ? "" : CGOpts.SplitDwarfFile, EmissionKind,
    0 /* DWOid */, CGOpts.SplitDwarfInlining, CGOpts.DebugInfoForProfiling,
    CGOpts.GnuPubnames);
585}

587llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
llvm::dwarf::TypeKind Encoding;
StringRef BTName;
switch (BT->getKind()) {
591#define BUILTIN_TYPE(Id, SingletonId)
592#define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
593#include "clang/AST/BuiltinTypes.def"
case BuiltinType::Dependent:
  llvm_unreachable("Unexpected builtin type")::llvm::llvm_unreachable_internal("Unexpected builtin type", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 595);
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,
                                         getOrCreateMainFile(), 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,
                                         getOrCreateMainFile(), 0);

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

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

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

  DBuilder.replaceArrays(
      ObjTy, DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
                 ObjTy, "isa", getOrCreateMainFile(), 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,
                                       getOrCreateMainFile(), 0);
  return SelTy;
}

642#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id: \
  return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t", \
                                  SingletonId);
646#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);

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::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::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;
}

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);
725}

727llvm::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);
735}

737llvm::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")(static_cast <bool> (Qc.empty() && "Unknown type qualifier for debug info"
) ? void (0) : __assert_fail ("Qc.empty() && \"Unknown type qualifier for debug info\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 760, __extension__ __PRETTY_FUNCTION__));
  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);
769}

771llvm::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);
782}

784llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
                                    llvm::DIFile *Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
                             Ty->getPointeeType(), Unit);
788}

790/// \return whether a C++ mangling exists for the type defined by TD.
791static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
switch (TheCU->getSourceLanguage()) {
case llvm::dwarf::DW_LANG_C_plus_plus:
  return true;
case llvm::dwarf::DW_LANG_ObjC_plus_plus:
  return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
default:
  return false;
}
800}

802/// In C++ mode, types have linkage, so we can rely on the ODR and
803/// on their mangled names, if they're external.
804static SmallString<256> getUniqueTagTypeName(const TagType *Ty,
                                           CodeGenModule &CGM,
                                           llvm::DICompileUnit *TheCU) {
SmallString<256> FullName;
const TagDecl *TD = Ty->getDecl();

if (!hasCXXMangling(TD, TheCU) || !TD->isExternallyVisible())
  return FullName;

// 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(FullName);
CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
return FullName;
818}

820/// \return the approproate DWARF tag for a composite type.
821static 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())(static_cast <bool> (RD->isClass()) ? void (0) : __assert_fail
 ("RD->isClass()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 830, __extension__ __PRETTY_FUNCTION__));
  Tag = llvm::dwarf::DW_TAG_class_type;
}
return Tag;
834}

836llvm::DICompositeType *
837CGDebugInfo::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());
unsigned Line = getLineNumber(RD->getLocation());
StringRef RDName = getClassName(RD);

uint64_t Size = 0;
uint32_t Align = 0;

// Create the type.
SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
    getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
    llvm::DINode::FlagFwdDecl, FullName);
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;
862}

864llvm::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);
884}

886llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
                                                  llvm::DIType *&Cache) {
if (Cache)
  return Cache;
Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
                                   TheCU, getOrCreateMainFile(), 0);
unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
Cache = DBuilder.createPointerType(Cache, Size);
return Cache;
895}

897llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
                                    llvm::DIFile *Unit) {
SmallVector<llvm::Metadata *, 8> EltTys;
QualType FType;
uint64_t FieldSize, FieldOffset;
uint32_t FieldAlign;
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;
unsigned LineNo = 0;

auto *EltTy =
    DBuilder.createStructType(Unit, "__block_descriptor", nullptr, LineNo,
                              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 = 0;
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);
FieldSize = CGM.getContext().getTypeSize(Ty);
FieldAlign = CGM.getContext().getTypeAlign(Ty);
EltTys.push_back(DBuilder.createMemberType(
    Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign, FieldOffset,
    llvm::DINode::FlagZero, DescTy));

FieldOffset += FieldSize;
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, LineNo,
                              FieldOffset, 0, Flags, nullptr, Elements);

return DBuilder.createPointerType(EltTy, Size);
953}

955llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
                                    llvm::DIFile *Unit) {
assert(Ty->isTypeAlias())(static_cast <bool> (Ty->isTypeAlias()) ? void (0) :
 __assert_fail ("Ty->isTypeAlias()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 957, __extension__ __PRETTY_FUNCTION__));
llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);

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

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

SourceLocation Loc = AliasDecl->getLocation();
return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
                              getLineNumber(Loc),
                              getDeclContextDescriptor(AliasDecl));
972}

974llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
                                    llvm::DIFile *Unit) {
// We don't set size information, but do specify where the typedef was
// declared.
SourceLocation Loc = Ty->getDecl()->getLocation();

// Typedefs are derived from some other type.
return DBuilder.createTypedef(
    getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
    Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
    getDeclContextDescriptor(Ty->getDecl()));
985}

987static 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;

// FIXME: Create new DW_CC_ codes for these calling conventions.
case CC_Win64:
case CC_X86_64SysV:
case CC_AAPCS:
case CC_AAPCS_VFP:
case CC_IntelOclBicc:
case CC_SpirFunction:
case CC_OpenCLKernel:
case CC_Swift:
case CC_PreserveMost:
case CC_PreserveAll:
case CC_X86RegCall:
  return 0;
}
return 0;
1019}

1021llvm::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()));
1042}

1044/// Convert an AccessSpecifier into the corresponding DINode flag.
1045/// As an optimization, return 0 if the access specifier equals the
1046/// default for the containing type.
1047static 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")::llvm::llvm_unreachable_internal("unexpected access enumerator"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1068);
1069}

1071llvm::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")(static_cast <bool> (SizeInBits > 0 && "found named 0-width bitfield"
) ? void (0) : __assert_fail ("SizeInBits > 0 && \"found named 0-width bitfield\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1087, __extension__ __PRETTY_FUNCTION__));
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);
1101}

1103llvm::DIType *
1104CGDebugInfo::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);
unsigned line = getLineNumber(loc);

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);
1126}

1128void 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!")(static_cast <bool> (!Field->isBitField() &&
 "lambdas don't have bitfield members!") ? void (0) : __assert_fail
 ("!Field->isBitField() && \"lambdas don't have bitfield members!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1143, __extension__ __PRETTY_FUNCTION__));
    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);
  }
}
1167}

1169llvm::DIDerivedType *
1170CGDebugInfo::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;
1197}

1199void 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);
1221}

1223void 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);
1232}

1234void 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);

  // Debug info for nested types is included in the member list only for
  // CodeView.
  bool IncludeNestedTypes = CGM.getCodeGenOpts().EmitCodeView;

  // 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;
      // Reuse the existing static member declaration if one exists
      auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
      if (MI != StaticDataMemberCache.end()) {
        assert(MI->second &&(static_cast <bool> (MI->second && "Static data member declaration should still exist"
) ? void (0) : __assert_fail ("MI->second && \"Static data member declaration should still exist\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1262, __extension__ __PRETTY_FUNCTION__))
               "Static data member declaration should still exist")(static_cast <bool> (MI->second && "Static data member declaration should still exist"
) ? void (0) : __assert_fail ("MI->second && \"Static data member declaration should still exist\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1262, __extension__ __PRETTY_FUNCTION__));
        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 (IncludeNestedTypes) {
      if (const auto *nestedType = dyn_cast<TypeDecl>(I))
        if (!nestedType->isImplicit() &&
            nestedType->getDeclContext() == record)
          CollectRecordNestedType(nestedType, elements);
    }
}
1281}

1283llvm::DISubroutineType *
1284CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
                                 llvm::DIFile *Unit) {
const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
if (Method->isStatic())
  return cast_or_null<llvm::DISubroutineType>(
      getOrCreateType(QualType(Func, 0), Unit));
return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
                                     Func, Unit);
1292}

1294llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
  QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
// Add "this" pointer.
llvm::DITypeRefArray Args(
    cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
        ->getTypeArray());
assert(Args.size() && "Invalid number of arguments!")(static_cast <bool> (Args.size() && "Invalid number of arguments!"
) ? void (0) : __assert_fail ("Args.size() && \"Invalid number of arguments!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1300, __extension__ __PRETTY_FUNCTION__));

SmallVector<llvm::Metadata *, 16> Elts;

// First element is always return type. For 'void' functions it is NULL.
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()));
1346}

1348/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1349/// inside a function.
1350static 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;
1356}

1358llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
  const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
bool IsCtorOrDtor =
    isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);

StringRef MethodName = getFunctionName(Method);
llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);

// 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 Virtuality = 0;
unsigned VIndex = 0;
llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
int ThisAdjustment = 0;

if (Method->isVirtual()) {
  if (Method->isPure())
    Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
  else
    Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;

  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);
    MicrosoftVTableContext::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;
}

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;

llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
llvm::DISubprogram *SP = DBuilder.createMethod(
    RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
    MethodTy, /*isLocalToUnit=*/false, /*isDefinition=*/false, Virtuality,
    VIndex, ThisAdjustment, ContainingType, Flags, CGM.getLangOpts().Optimize,
    TParamsArray.get());

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

return SP;
1459}

1461void 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()->getAs<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));
}
1497}

1499void 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);
}
1512}

1514void 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()->getAs<RecordType>()->getDecl());
  if (!SeenTypes.insert(Base).second)
    continue;
  auto *BaseTy = getOrCreateType(BI.getType(), Unit);
  llvm::DINode::DIFlags BFlags = StartingFlags;
  uint64_t BaseOffset;

  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);
    }
    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, BFlags);
  EltTys.push_back(DTy);
}
1554}

1556llvm::DINodeArray
1557CGDebugInfo::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;
  if (TPList)
    Name = TPList->getParam(i)->getName();
  switch (TA.getKind()) {
  case TemplateArgument::Type: {
    llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
    TemplateParams.push_back(
        DBuilder.createTemplateTypeParameter(TheCU, Name, TTy));
  } break;
  case TemplateArgument::Integral: {
    llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy,
        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;
    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);
    }
    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy,
        cast_or_null<llvm::Constant>(V->stripPointerCasts())));
  } 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, 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")(static_cast <bool> (V && "Expression in template argument isn't constant"
) ? void (0) : __assert_fail ("V && \"Expression in template argument isn't constant\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1644, __extension__ __PRETTY_FUNCTION__));
    llvm::DIType *TTy = getOrCreateType(T, Unit);
    TemplateParams.push_back(DBuilder.createTemplateValueParameter(
        TheCU, Name, TTy, V->stripPointerCasts()));
  } break;
  // And the following should never occur:
  case TemplateArgument::TemplateExpansion:
  case TemplateArgument::Null:
    llvm_unreachable(::llvm::llvm_unreachable_internal("These argument types shouldn't exist in concrete types"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1653)
        "These argument types shouldn't exist in concrete types")::llvm::llvm_unreachable_internal("These argument types shouldn't exist in concrete types"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1653);
  }
}
return DBuilder.getOrCreateArray(TemplateParams);
1657}

1659llvm::DINodeArray
1660CGDebugInfo::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();
1671}

1673llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
  const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
// Always get the full list of parameters, not just the ones from
// the specialization.
TemplateParameterList *TPList =
    TSpecial->getSpecializedTemplate()->getTemplateParameters();
const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
return CollectTemplateParams(TPList, TAList.asArray(), Unit);
1681}

1683llvm::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;
1703}

1705StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
// Copy the gdb compatible name on the side and use its reference.
return internString("_vptr$", RD->getNameAsString());
1708}

1710void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
                                  SmallVectorImpl<llvm::Metadata *> &EltTys,
                                  llvm::DICompositeType *RecordTy) {
// 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);
1765}

1767llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
                                               SourceLocation Loc) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1769, __extension__ __PRETTY_FUNCTION__));
llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
return T;
1772}

1774llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
                                                  SourceLocation Loc) {
return getOrCreateStandaloneType(D, Loc);
1777}

1779llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
                                                   SourceLocation Loc) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1781, __extension__ __PRETTY_FUNCTION__));
assert(!D.isNull() && "null type")(static_cast <bool> (!D.isNull() && "null type"
) ? void (0) : __assert_fail ("!D.isNull() && \"null type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1782, __extension__ __PRETTY_FUNCTION__));
llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
assert(T && "could not create debug info for type")(static_cast <bool> (T && "could not create debug info for type"
) ? void (0) : __assert_fail ("T && \"could not create debug info for type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1784, __extension__ __PRETTY_FUNCTION__));

RetainedTypes.push_back(D.getAsOpaquePtr());
return T;
1788}

1790void 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())(static_cast <bool> (!Res->isForwardDecl()) ? void (
0) : __assert_fail ("!Res->isForwardDecl()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1799, __extension__ __PRETTY_FUNCTION__));
TypeCache[TyPtr].reset(Res);
1801}

1803void CGDebugInfo::completeType(const RecordDecl *RD) {
if (DebugKind > codegenoptions::LimitedDebugInfo ||
    !CGM.getLangOpts().CPlusPlus)
  completeRequiredType(RD);
1807}

1809/// Return true if the class or any of its methods are marked dllimport.
1810static 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;
1817}

1819/// Does a type definition exist in an imported clang module?
1820static 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;
  auto TemplateKind = CXXDecl->getTemplateSpecializationKind();
  if (TemplateKind != TSK_Undeclared) {
    // 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;
1840}

1842void 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);
1854}

1856void 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())(static_cast <bool> (!Res->isForwardDecl()) ? void (
0) : __assert_fail ("!Res->isForwardDecl()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1865, __extension__ __PRETTY_FUNCTION__));
TypeCache[TyPtr].reset(Res);
1867}

1869static 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;
1877}

1879static 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;

if (DebugKind > codegenoptions::LimitedDebugInfo)
  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;

return false;
1923}

1925void 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);
1933}

1935llvm::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);
1946}

1948llvm::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, DefUnit);

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, FwdDecl);
}

// 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;
2004}

2006llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
                                    llvm::DIFile *Unit) {
// Ignore protocols.
return getOrCreateType(Ty->getBaseType(), Unit);
2010}

2012llvm::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()));
2022}

2024/// \return true if Getter has the default name for the property PD.
2025static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
                               const ObjCMethodDecl *Getter) {
assert(PD)(static_cast <bool> (PD) ? void (0) : __assert_fail ("PD"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2027, __extension__ __PRETTY_FUNCTION__));
if (!Getter)
  return true;

assert(Getter->getDeclName().isObjCZeroArgSelector())(static_cast <bool> (Getter->getDeclName().isObjCZeroArgSelector
()) ? void (0) : __assert_fail ("Getter->getDeclName().isObjCZeroArgSelector()"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2031, __extension__ __PRETTY_FUNCTION__));
return PD->getName() ==
       Getter->getDeclName().getObjCSelector().getNameForSlot(0);
2034}

2036/// \return true if Setter has the default name for the property PD.
2037static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
                               const ObjCMethodDecl *Setter) {
assert(PD)(static_cast <bool> (PD) ? void (0) : __assert_fail ("PD"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2039, __extension__ __PRETTY_FUNCTION__));
if (!Setter)
  return true;

assert(Setter->getDeclName().isObjCOneArgSelector())(static_cast <bool> (Setter->getDeclName().isObjCOneArgSelector
()) ? void (0) : __assert_fail ("Setter->getDeclName().isObjCOneArgSelector()"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2043, __extension__ __PRETTY_FUNCTION__));
return SelectorTable::constructSetterName(PD->getName()) ==
       Setter->getDeclName().getObjCSelector().getNameForSlot(0);
2046}

2048llvm::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);
2082}

2084llvm::DIModule *
2085CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::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 commmand 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;
if (CreateSkeletonCU && IsRootModule) {
  // 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 =
      Mod.getSignature()
          ? (uint64_t)Mod.getSignature()[1] << 32 | Mod.getSignature()[0]
          : ~1ULL;
  llvm::DIBuilder DIB(CGM.getModule());
  DIB.createCompileUnit(TheCU->getSourceLanguage(),
                        // TODO: Support "Source" from external AST providers?
                        DIB.createFile(Mod.getModuleName(), Mod.getPath()),
                        TheCU->getProducer(), true, StringRef(), 0,
                        Mod.getASTFile(), llvm::DICompileUnit::FullDebug,
                        Signature);
  DIB.finalize();
}
llvm::DIModule *Parent =
    IsRootModule ? nullptr
                 : getOrCreateModuleRef(
                       ExternalASTSource::ASTSourceDescriptor(*M->Parent),
                       CreateSkeletonCU);
llvm::DIModule *DIMod =
    DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
                          Mod.getPath(), CGM.getHeaderSearchOpts().Sysroot);
ModuleCache[M].reset(DIMod);
return DIMod;
2146}

2148llvm::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,
                                                    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);
};
{
  llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet;
  for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
    for (auto *PD : ClassExt->properties()) {
      PropertySet.insert(PD->getIdentifier());
      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(PD->getIdentifier()).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 = PD->getGetterMethodDecl();
        ObjCMethodDecl *Setter = PD->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;
2308}

2310llvm::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(0, SizeExpr->getSecond());
else
  Subscript = DBuilder.getOrCreateSubrange(0, Count ? Count : -1);
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);
2328}

2330llvm::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()) {
      llvm::APSInt V;
      if (Size->EvaluateAsInt(V, CGM.getContext()))
        Count = V.getExtValue();
    }
  }

  auto SizeNode = SizeExprCache.find(EltTy);
  if (SizeNode != SizeExprCache.end())
    Subscripts.push_back(
        DBuilder.getOrCreateSubrange(0, SizeNode->getSecond()));
  else
    Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
  EltTy = Ty->getElementType();
}

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

return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
                                SubscriptArray);
2391}

2393llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
                                    llvm::DIFile *Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
                             Ty->getPointeeType(), Unit);
2397}

2399llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
                                    llvm::DIFile *Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
                             Ty->getPointeeType(), Unit);
2403}

2405llvm::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 MSInheritanceAttr::Keyword_single_inheritance:
      Flags |= llvm::DINode::FlagSingleInheritance;
      break;
    case MSInheritanceAttr::Keyword_multiple_inheritance:
      Flags |= llvm::DINode::FlagMultipleInheritance;
      break;
    case MSInheritanceAttr::Keyword_virtual_inheritance:
      Flags |= llvm::DINode::FlagVirtualInheritance;
      break;
    case MSInheritanceAttr::Keyword_unspecified_inheritance:
      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(CGM.getContext().getPointerType(QualType(
                                      Ty->getClass(), FPT->getTypeQuals())),
                                  FPT, U),
    ClassType, Size, /*Align=*/0, Flags);
2444}

2446llvm::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);
2449}

2451llvm::DIType* CGDebugInfo::CreateType(const PipeType *Ty,
                                   llvm::DIFile *U) {
return getOrCreateType(Ty->getElementType(), U);
2454}

2456llvm::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> FullName = getUniqueTagTypeName(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, FullName);

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

return CreateTypeDefinition(Ty);
2498}

2500llvm::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> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);

// Create elements for each enumerator.
SmallVector<llvm::Metadata *, 16> Enumerators;
ED = ED->getDefinition();
bool IsSigned = ED->getIntegerType()->isSignedIntegerType();
for (const auto *Enum : ED->enumerators()) {
  const auto &InitVal = Enum->getInitVal();
  auto Value = IsSigned ? InitVal.getSExtValue() : InitVal.getZExtValue();
  Enumerators.push_back(
      DBuilder.createEnumerator(Enum->getName(), Value, !IsSigned));
}

// 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,
                                      FullName, ED->isFixed());
2532}

2534llvm::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);
2539}

2541llvm::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);
2547}

2549static 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::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.")(static_cast <bool> (!DT.isNull() && "Undeduced types shouldn't reach here."
) ? void (0) : __assert_fail ("!DT.isNull() && \"Undeduced types shouldn't reach here.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2595, __extension__ __PRETTY_FUNCTION__));
    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!")(static_cast <bool> (T != LastT && "Type unwrapping failed to unwrap!"
) ? void (0) : __assert_fail ("T != LastT && \"Type unwrapping failed to unwrap!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2606, __extension__ __PRETTY_FUNCTION__));
  (void)LastT;
} while (true);
2609}

2611llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {

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

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;
2624}

2626void CGDebugInfo::completeTemplateDefinition(
  const ClassTemplateSpecializationDecl &SD) {
if (DebugKind <= codegenoptions::DebugLineTablesOnly)
  return;
completeUnusedClass(SD);
2631}

2633void 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());
2641}

2643llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
if (Ty.isNull())
  return nullptr;

// 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;
2660}

2662llvm::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 = ExternalASTSource::ASTSourceDescriptor(*M);
    return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
  } else {
    // This the precompiled header being built.
    return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
  }
}

return nullptr;
2695}

2697llvm::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()) {
2704#define TYPE(Class, Base)
2705#define ABSTRACT_TYPE(Class, Base)
2706#define NON_CANONICAL_TYPE(Class, Base)
2707#define DEPENDENT_TYPE(Class, Base) case Type::Class:
2708#include "clang/AST/TypeNodes.def"
  llvm_unreachable("Dependent types cannot show up in debug information")::llvm::llvm_unreachable_internal("Dependent types cannot show up in debug information"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2709);

case Type::ExtVector:
case Type::Vector:
  return CreateType(cast<VectorType>(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::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::SubstTemplateTypeParm:
case Type::TypeOfExpr:
case Type::TypeOf:
case Type::Decltype:
case Type::UnaryTransform:
case Type::PackExpansion:
  break;
}

llvm_unreachable("type should have been unwrapped!")::llvm::llvm_unreachable_internal("type should have been unwrapped!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2777);
2778}

2780llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
                                                         llvm::DIFile *Unit) {
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;
2803}

2805// TODO: Currently used for context chains when limiting debug info.
2806llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();

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

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> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);

// Explicitly record the calling convention 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;
}

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

// 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")::llvm::llvm_unreachable_internal("invalid composite type tag"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2851);

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 (FullName.empty())
    break;
  LLVM_FALLTHROUGH[[clang::fallthrough]];

case llvm::dwarf::DW_TAG_structure_type:
case llvm::dwarf::DW_TAG_union_type:
case llvm::dwarf::DW_TAG_class_type:
  // Immediatley 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;
2879}

2881void 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);
2903}

2905llvm::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;
2915}

2917void 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.getDecl());
Name = getFunctionName(FD);
// Use mangled name as linkage name for C/C++ functions.
if (FD->hasPrototype()) {
  LinkageName = CGM.getMangledName(GD);
  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 &&
                            DebugKind <= codegenoptions::DebugLineTablesOnly))
  LinkageName = StringRef();

if (DebugKind >= codegenoptions::LimitedDebugInfo) {
  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);
  }
  // Check if it is a noreturn-marked function
  if (FD->isNoReturn())
    Flags |= llvm::DINode::FlagNoReturn;
  // Collect template parameters.
  TParamsArray = CollectFunctionTemplateParams(FD, Unit);
}
2954}

2956void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
                                    unsigned &LineNo, QualType &T,
                                    StringRef &Name, StringRef &LinkageName,
                                    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,
                                            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();

// 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);
3001}

3003llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
                                                        bool Stub) {
llvm::DINodeArray TParamsArray;
StringRef Name, LinkageName;
llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
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 = dyn_cast<FunctionDecl>(GD.getDecl());

// Build function type.
SmallVector<QualType, 16> ArgTypes;
if (FD)
  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 (Stub) {
  return DBuilder.createFunction(
      DContext, Name, LinkageName, Unit, Line,
      getOrCreateFunctionType(GD.getDecl(), FnType, Unit),
      !FD->isExternallyVisible(),
      /* isDefinition = */ true, 0, Flags, CGM.getLangOpts().Optimize,
      TParamsArray.get(), getFunctionDeclaration(FD));
}

llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
    DContext, Name, LinkageName, Unit, Line,
    getOrCreateFunctionType(GD.getDecl(), FnType, Unit),
    !FD->isExternallyVisible(),
    /* isDefinition = */ false, 0, Flags, CGM.getLangOpts().Optimize,
    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;
3044}

3046llvm::DISubprogram *
3047CGDebugInfo::getFunctionForwardDeclaration(GlobalDecl GD) {
return getFunctionFwdDeclOrStub(GD, /* Stub = */ false);
3049}

3051llvm::DISubprogram *
3052CGDebugInfo::getFunctionStub(GlobalDecl GD) {
return getFunctionFwdDeclOrStub(GD, /* Stub = */ true);
3054}

3056llvm::DIGlobalVariable *
3057CGDebugInfo::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);

collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, DContext);
auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
    DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
    !VD->isExternallyVisible(), nullptr, Align);
FwdDeclReplaceMap.emplace_back(
    std::piecewise_construct,
    std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
    std::make_tuple(static_cast<llvm::Metadata *>(GV)));
return GV;
3075}

3077llvm::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;
3102}

3104llvm::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;
3137}

3139// getOrCreateFunctionType - Construct type. If it is a c++ method, include
3140// implicit parameter "this".
3141llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
                                                           QualType FnType,
                                                           llvm::DIFile *F) {
if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
  // 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);

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));
3208}

3210void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
                                  SourceLocation ScopeLoc, QualType FnType,
                                  llvm::Function *Fn, CGBuilderTy &Builder) {

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::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 {
  // Use llvm function name.
  Name = Fn->getName();
  Flags |= llvm::DINode::FlagPrototyped;
}
if (Name.startswith("\01"))
  Name = Name.substr(1);

if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>()) {
  Flags |= llvm::DINode::FlagArtificial;
  // Artificial functions should not silently reuse CurLoc.
  CurLoc = SourceLocation();
}
unsigned LineNo = getLineNumber(Loc);
unsigned ScopeLine = getLineNumber(ScopeLoc);

// 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,
    getOrCreateFunctionType(D, FnType, Unit), Fn->hasLocalLinkage(),
    true /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
    TParamsArray.get(), getFunctionDeclaration(D));
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);
3283}

3285void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
                                 QualType FnType) {
StringRef Name;
StringRef LinkageName;

const Decl *D = GD.getDecl();
if (!D)
1
Assuming 'D' is non-null→
2
←
Taking false branch→
  return;

llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
llvm::DIFile *Unit = getOrCreateFile(Loc);
llvm::DIScope *FDContext = getDeclContextDescriptor(D);
llvm::DINodeArray TParamsArray;
if (isa<FunctionDecl>(D)) {
3
←
Taking false branch→
  // 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)) {
4
←
Assuming 'OMD' is non-null→
5
←
Taking true branch→
  Name = getObjCMethodName(OMD);
6
←
Calling 'CGDebugInfo::getObjCMethodName'→
  Flags |= llvm::DINode::FlagPrototyped;
} else {
  llvm_unreachable("not a function or ObjC method")::llvm::llvm_unreachable_internal("not a function or ObjC method"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3306);
}
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;

DBuilder.retainType(DBuilder.createFunction(
    FDContext, Name, LinkageName, Unit, LineNo,
    getOrCreateFunctionType(D, FnType, Unit), false /*internalLinkage*/,
    false /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
    TParamsArray.get(), getFunctionDeclaration(D)));
3325}

3327void 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());
3340}

3342void CGDebugInfo::EmitInlineFunctionEnd(CGBuilderTy &Builder) {
assert(CurInlinedAt && "unbalanced inline scope stack")(static_cast <bool> (CurInlinedAt && "unbalanced inline scope stack"
) ? void (0) : __assert_fail ("CurInlinedAt && \"unbalanced inline scope stack\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3343, __extension__ __PRETTY_FUNCTION__));
EmitFunctionEnd(Builder, nullptr);
setInlinedAt(llvm::DebugLoc(CurInlinedAt).getInlinedAt());
3346}

3348void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
// Update our current location
setLocation(Loc);

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

llvm::MDNode *Scope = LexicalBlockStack.back();
Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
    getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope, CurInlinedAt));
3358}

3360void 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)));
3367}

3369void 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);
3381}

3383void 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::DebugLoc::get(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);
3398}

3400void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
                                    SourceLocation Loc) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")(static_cast <bool> (!LexicalBlockStack.empty() &&
 "Region stack mismatch, stack empty!") ? void (0) : __assert_fail
 ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3402, __extension__ __PRETTY_FUNCTION__));

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

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

LexicalBlockStack.pop_back();
3411}

3413void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")(static_cast <bool> (!LexicalBlockStack.empty() &&
 "Region stack mismatch, stack empty!") ? void (0) : __assert_fail
 ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3414, __extension__ __PRETTY_FUNCTION__));
unsigned RCount = FnBeginRegionCount.back();
assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch")(static_cast <bool> (RCount <= LexicalBlockStack.size
() && "Region stack mismatch") ? void (0) : __assert_fail
 ("RCount <= LexicalBlockStack.size() && \"Region stack mismatch\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3416, __extension__ __PRETTY_FUNCTION__));

// 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());
3428}

3430llvm::DIType *CGDebugInfo::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, ArrayType::Normal, 0);
    EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
  }
}

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

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

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

llvm::DINode::DIFlags Flags = llvm::DINode::FlagBlockByrefStruct;

return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
                                 nullptr, Elements);
3501}

3503llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
                                              llvm::Value *Storage,
                                              llvm::Optional<unsigned> ArgNo,
                                              CGBuilderTy &Builder) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3507, __extension__ __PRETTY_FUNCTION__));
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")(static_cast <bool> (!LexicalBlockStack.empty() &&
 "Region stack mismatch, stack empty!") ? void (0) : __assert_fail
 ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3508, __extension__ __PRETTY_FUNCTION__));
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);
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()) {
  if (VD->hasAttr<BlocksAttr>()) {
    // 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
    // artifical 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::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
          Builder.GetInsertBlock());
    }
  }
}

// Create the descriptor for the variable.
auto *D = ArgNo
              ? DBuilder.createParameterVariable(
                    Scope, Name, *ArgNo, Unit, Line, Ty,
                    CGM.getLangOpts().Optimize, Flags)
              : 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::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
                       Builder.GetInsertBlock());

return D;
3626}

3628llvm::DILocalVariable *
3629CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
                                     CGBuilderTy &Builder) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3631, __extension__ __PRETTY_FUNCTION__));
return EmitDeclare(VD, Storage, llvm::None, Builder);
3633}

3635llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
                                        llvm::DIType *Ty) {
llvm::DIType *CachedTy = getTypeOrNull(QualTy);
if (CachedTy)
  Ty = CachedTy;
return DBuilder.createObjectPointerType(Ty);
3641}

3643void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
  const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
  const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3646, __extension__ __PRETTY_FUNCTION__));
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")(static_cast <bool> (!LexicalBlockStack.empty() &&
 "Region stack mismatch, stack empty!") ? void (0) : __assert_fail
 ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3647, __extension__ __PRETTY_FUNCTION__));

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);
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.
unsigned Line = getLineNumber(VD->getLocation());
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::DebugLoc::get(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());
3712}

3714void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
                                         unsigned ArgNo,
                                         CGBuilderTy &Builder) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3717, __extension__ __PRETTY_FUNCTION__));
EmitDeclare(VD, AI, ArgNo, Builder);
3719}

3721namespace {
3722struct BlockLayoutChunk {
uint64_t OffsetInBits;
const BlockDecl::Capture *Capture;
3725};
3726bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
return l.OffsetInBits < r.OffsetInBits;
3728}
3729}

3731void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
                                                     StringRef Name,
                                                     unsigned ArgNo,
                                                     llvm::AllocaInst *Alloca,
                                                     CGBuilderTy &Builder) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3736, __extension__ __PRETTY_FUNCTION__));
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;
fields.push_back(createFieldType("__isa", C.VoidPtrTy, loc, AS_public,
                                 blockLayout->getElementOffsetInBits(0),
                                 tunit, tunit));
fields.push_back(createFieldType("__flags", C.IntTy, loc, AS_public,
                                 blockLayout->getElementOffsetInBits(1),
                                 tunit, tunit));
fields.push_back(createFieldType("__reserved", C.IntTy, loc, AS_public,
                                 blockLayout->getElementOffsetInBits(2),
                                 tunit, tunit));
auto *FnTy = block.getBlockExpr()->getFunctionType();
auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
fields.push_back(createFieldType("__FuncPtr", FnPtrType, loc, AS_public,
                                 blockLayout->getElementOffsetInBits(3),
                                 tunit, tunit));
fields.push_back(createFieldType(
    "__descriptor", C.getPointerType(block.NeedsCopyDispose
                                         ? C.getBlockDescriptorExtendedType()
                                         : C.getBlockDescriptorType()),
    loc, AS_public, blockLayout->getElementOffsetInBits(4), tunit, tunit));

// 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(C);
    else if (auto *RDecl = dyn_cast<CXXRecordDecl>(blockDecl->getParent()))
      type = QualType(RDecl->getTypeForDecl(), 0);
    else
      llvm_unreachable("unexpected block declcontext")::llvm::llvm_unreachable_internal("unexpected block declcontext"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3818);

    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 creates a second copy of this type!
    uint64_t xoffset;
    fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
    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::DebugLoc::get(line, column, scope, CurInlinedAt),
                       Builder.GetInsertBlock());
3873}

3875llvm::DIDerivedType *
3876CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
if (!D->isStaticDataMember())
  return nullptr;

auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
if (MI != StaticDataMemberCache.end()) {
  assert(MI->second && "Static data member declaration should still exist")(static_cast <bool> (MI->second && "Static data member declaration should still exist"
) ? void (0) : __assert_fail ("MI->second && \"Static data member declaration should still exist\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3882, __extension__ __PRETTY_FUNCTION__));
  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));
3891}

3893llvm::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;
3916}

3918void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
                                   const VarDecl *D) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3920, __extension__ __PRETTY_FUNCTION__));
if (D->hasAttr<NoDebugAttr>())
  return;

// 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;
collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName, 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() &&(static_cast <bool> (RD->isAnonymousStructOrUnion() &&
 "unnamed non-anonymous struct or union?") ? void (0) : __assert_fail
 ("RD->isAnonymousStructOrUnion() && \"unnamed non-anonymous struct or union?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3949, __extension__ __PRETTY_FUNCTION__))
         "unnamed non-anonymous struct or union?")(static_cast <bool> (RD->isAnonymousStructOrUnion() &&
 "unnamed non-anonymous struct or union?") ? void (0) : __assert_fail
 ("RD->isAnonymousStructOrUnion() && \"unnamed non-anonymous struct or union?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3949, __extension__ __PRETTY_FUNCTION__));
  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());
  AppendAddressSpaceXDeref(AddressSpace, Expr);

  GVE = DBuilder.createGlobalVariableExpression(
      DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
      Var->hasLocalLinkage(),
      Expr.empty() ? nullptr : DBuilder.createExpression(Expr),
      getOrCreateStaticDataMemberDeclarationOrNull(D), Align);
  Var->addDebugInfo(GVE);
}
DeclCache[D->getCanonicalDecl()].reset(GVE);
3967}

3969void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo)(static_cast <bool> (DebugKind >= codegenoptions::LimitedDebugInfo
) ? void (0) : __assert_fail ("DebugKind >= codegenoptions::LimitedDebugInfo"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3970, __extension__ __PRETTY_FUNCTION__));
if (VD->hasAttr<NoDebugAttr>())
  return;
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?")(static_cast <bool> (isa<EnumType>(ED->getTypeForDecl
()) && "Enum without EnumType?") ? void (0) : __assert_fail
 ("isa<EnumType>(ED->getTypeForDecl()) && \"Enum without EnumType?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3980, __extension__ __PRETTY_FUNCTION__));
  Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
}
// Do not use global variables for enums.
//
// FIXME: why not?
if (Ty->getTag() == llvm::dwarf::DW_TAG_enumeration_type)
  return;
// Do not emit separate definitions for function local const/statics.
if (isa<FunctionDecl>(VD->getDeclContext()))
  return;
VD = cast<ValueDecl>(VD->getCanonicalDecl());
auto *VarD = cast<VarDecl>(VD);
if (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());
}
GV.reset(DBuilder.createGlobalVariableExpression(
    DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
    true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
    Align));
4024}

4026llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
if (!LexicalBlockStack.empty())
  return LexicalBlockStack.back();
llvm::DIScope *Mod = getParentModuleOrNull(D);
return getContextDescriptor(D, Mod ? Mod : TheCU);
4031}

4033void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
  return;
const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
if (!NSDecl->isAnonymousNamespace() ||
    CGM.getCodeGenOpts().DebugExplicitImport) {
  auto Loc = UD.getLocation();
  DBuilder.createImportedModule(
      getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
      getOrCreateNamespace(NSDecl), getOrCreateFile(Loc), getLineNumber(Loc));
}
4044}

4046void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
  return;
assert(UD.shadow_size() &&(static_cast <bool> (UD.shadow_size() && "We shouldn't be codegening an invalid UsingDecl containing no decls"
) ? void (0) : __assert_fail ("UD.shadow_size() && \"We shouldn't be codegening an invalid UsingDecl containing no decls\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4050, __extension__ __PRETTY_FUNCTION__))
       "We shouldn't be codegening an invalid UsingDecl containing no decls")(static_cast <bool> (UD.shadow_size() && "We shouldn't be codegening an invalid UsingDecl containing no decls"
) ? void (0) : __assert_fail ("UD.shadow_size() && \"We shouldn't be codegening an invalid UsingDecl containing no decls\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4050, __extension__ __PRETTY_FUNCTION__));
// Emitting one decl is sufficient - debuggers can detect that this is an
// overloaded name & provide lookup for all the overloads.
const UsingShadowDecl &USD = **UD.shadow_begin();

// 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()->getAs<FunctionProtoType>()->getContainedAutoType())
    if (AT->getDeducedType().isNull())
      return;
if (llvm::DINode *Target =
        getDeclarationOrDefinition(USD.getUnderlyingDecl())) {
  auto Loc = USD.getLocation();
  DBuilder.createImportedDeclaration(
      getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
      getOrCreateFile(Loc), getLineNumber(Loc));
}
4071}

4073void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
if (CGM.getCodeGenOpts().getDebuggerTuning() != llvm::DebuggerKind::LLDB)
  return;
if (Module *M = ID.getImportedModule()) {
  auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
  auto Loc = ID.getLocation();
  DBuilder.createImportedDeclaration(
      getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
      getOrCreateModuleRef(Info, DebugTypeExtRefs), getOrCreateFile(Loc),
      getLineNumber(Loc));
}
4084}

4086llvm::DIImportedEntity *
4087CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
  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;
4109}

4111llvm::DINamespace *
4112CGDebugInfo::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;
4126}

4128void CGDebugInfo::setDwoId(uint64_t Signature) {
assert(TheCU && "no main compile unit")(static_cast <bool> (TheCU && "no main compile unit"
) ? void (0) : __assert_fail ("TheCU && \"no main compile unit\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4129, __extension__ __PRETTY_FUNCTION__));
TheCU->setDWOId(Signature);
4131}


4134void 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);
}

for (auto p : ReplaceMap) {
  assert(p.second)(static_cast <bool> (p.second) ? void (0) : __assert_fail
 ("p.second", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4146, __extension__ __PRETTY_FUNCTION__));
  auto *Ty = cast<llvm::DIType>(p.second);
  assert(Ty->isForwardDecl())(static_cast <bool> (Ty->isForwardDecl()) ? void (0)
 : __assert_fail ("Ty->isForwardDecl()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4148, __extension__ __PRETTY_FUNCTION__));

  auto it = TypeCache.find(p.first);
  assert(it != TypeCache.end())(static_cast <bool> (it != TypeCache.end()) ? void (0) :
 __assert_fail ("it != TypeCache.end()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4151, __extension__ __PRETTY_FUNCTION__));
  assert(it->second)(static_cast <bool> (it->second) ? void (0) : __assert_fail
 ("it->second", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4152, __extension__ __PRETTY_FUNCTION__));

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

for (const auto &p : FwdDeclReplaceMap) {
  assert(p.second)(static_cast <bool> (p.second) ? void (0) : __assert_fail
 ("p.second", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4159, __extension__ __PRETTY_FUNCTION__));
  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();
4184}

4186void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
  return;

if (auto *DieTy = getOrCreateType(Ty, getOrCreateMainFile()))
  // Don't ignore in case of explicit cast where it is referenced indirectly.
  DBuilder.retainType(DieTy);
4193}

4195llvm::DebugLoc CGDebugInfo::SourceLocToDebugLoc(SourceLocation Loc) {
if (LexicalBlockStack.empty())
  return llvm::DebugLoc();

llvm::MDNode *Scope = LexicalBlockStack.back();
return llvm::DebugLoc::get(
        getLineNumber(Loc), getColumnNumber(Loc), Scope);
4202}

←

/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/CodeGen/CGDebugInfo.h

1//===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This is the source-level debug info generator for llvm translation.
11//
12//===----------------------------------------------------------------------===//

14#ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
15#define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H

17#include "CGBuilder.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/ExternalASTSource.h"
21#include "clang/AST/Type.h"
22#include "clang/AST/TypeOrdering.h"
23#include "clang/Basic/SourceLocation.h"
24#include "clang/Frontend/CodeGenOptions.h"
25#include "llvm/ADT/DenseMap.h"
26#include "llvm/ADT/DenseSet.h"
27#include "llvm/ADT/Optional.h"
28#include "llvm/IR/DIBuilder.h"
29#include "llvm/IR/DebugInfo.h"
30#include "llvm/IR/ValueHandle.h"
31#include "llvm/Support/Allocator.h"

33namespace llvm {
34class MDNode;
35}

37namespace clang {
38class ClassTemplateSpecializationDecl;
39class GlobalDecl;
40class ModuleMap;
41class ObjCInterfaceDecl;
42class ObjCIvarDecl;
43class UsingDecl;
44class VarDecl;

46namespace CodeGen {
47class CodeGenModule;
48class CodeGenFunction;
49class CGBlockInfo;

51/// This class gathers all debug information during compilation and is
52/// responsible for emitting to llvm globals or pass directly to the
53/// backend.
54class CGDebugInfo {
friend class ApplyDebugLocation;
friend class SaveAndRestoreLocation;
CodeGenModule &CGM;
const codegenoptions::DebugInfoKind DebugKind;
bool DebugTypeExtRefs;
llvm::DIBuilder DBuilder;
llvm::DICompileUnit *TheCU = nullptr;
ModuleMap *ClangModuleMap = nullptr;
ExternalASTSource::ASTSourceDescriptor PCHDescriptor;
SourceLocation CurLoc;
llvm::MDNode *CurInlinedAt = nullptr;
llvm::DIType *VTablePtrType = nullptr;
llvm::DIType *ClassTy = nullptr;
llvm::DICompositeType *ObjTy = nullptr;
llvm::DIType *SelTy = nullptr;
70#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
llvm::DIType *SingletonId = nullptr;
72#include "clang/Basic/OpenCLImageTypes.def"
llvm::DIType *OCLSamplerDITy = nullptr;
llvm::DIType *OCLEventDITy = nullptr;
llvm::DIType *OCLClkEventDITy = nullptr;
llvm::DIType *OCLQueueDITy = nullptr;
llvm::DIType *OCLNDRangeDITy = nullptr;
llvm::DIType *OCLReserveIDDITy = nullptr;

/// Cache of previously constructed Types.
llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;

llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;

/// Cache that maps VLA types to size expressions for that type,
/// represented by instantiated Metadata nodes.
llvm::SmallDenseMap<QualType, llvm::Metadata *> SizeExprCache;

struct ObjCInterfaceCacheEntry {
  const ObjCInterfaceType *Type;
  llvm::DIType *Decl;
  llvm::DIFile *Unit;
  ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
                          llvm::DIFile *Unit)
      : Type(Type), Decl(Decl), Unit(Unit) {}
};

/// Cache of previously constructed interfaces which may change.
llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;

/// Cache of references to clang modules and precompiled headers.
llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;

/// List of interfaces we want to keep even if orphaned.
std::vector<void *> RetainedTypes;

/// Cache of forward declared types to RAUW at the end of compilation.
std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;

/// Cache of replaceable forward declarations (functions and
/// variables) to RAUW at the end of compilation.
std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
    FwdDeclReplaceMap;

/// Keep track of our current nested lexical block.
std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
/// Keep track of LexicalBlockStack counter at the beginning of a
/// function. This is used to pop unbalanced regions at the end of a
/// function.
std::vector<unsigned> FnBeginRegionCount;

/// This is a storage for names that are constructed on demand. For
/// example, C++ destructors, C++ operators etc..
llvm::BumpPtrAllocator DebugInfoNames;
StringRef CWDName;

llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
/// Cache declarations relevant to DW_TAG_imported_declarations (C++
/// using declarations) that aren't covered by other more specific caches.
llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NamespaceCache;
llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
    NamespaceAliasCache;
llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
    StaticDataMemberCache;

/// Helper functions for getOrCreateType.
/// @{
/// Currently the checksum of an interface includes the number of
/// ivars and property accessors.
llvm::DIType *CreateType(const BuiltinType *Ty);
llvm::DIType *CreateType(const ComplexType *Ty);
llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
llvm::DIType *CreateType(const TemplateSpecializationType *Ty,
                         llvm::DIFile *Fg);
llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
/// Get structure or union type.
llvm::DIType *CreateType(const RecordType *Tyg);
llvm::DIType *CreateTypeDefinition(const RecordType *Ty);
llvm::DICompositeType *CreateLimitedType(const RecordType *Ty);
void CollectContainingType(const CXXRecordDecl *RD,
                           llvm::DICompositeType *CT);
/// Get Objective-C interface type.
llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F);
llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty,
                                   llvm::DIFile *F);
/// Get Objective-C object type.
llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const ObjCTypeParamType *Ty, llvm::DIFile *Unit);

llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit);
llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F);
/// Get enumeration type.
llvm::DIType *CreateEnumType(const EnumType *Ty);
llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
/// Look up the completed type for a self pointer in the TypeCache and
/// create a copy of it with the ObjectPointer and Artificial flags
/// set. If the type is not cached, a new one is created. This should
/// never happen though, since creating a type for the implicit self
/// argument implies that we already parsed the interface definition
/// and the ivar declarations in the implementation.
llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
/// @}

/// Get the type from the cache or return null type if it doesn't
/// exist.
llvm::DIType *getTypeOrNull(const QualType);
/// Return the debug type for a C++ method.
/// \arg CXXMethodDecl is of FunctionType. This function type is
/// not updated to include implicit \c this pointer. Use this routine
/// to get a method type which includes \c this pointer.
llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
                                              llvm::DIFile *F);
llvm::DISubroutineType *
getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
                              llvm::DIFile *Unit);
llvm::DISubroutineType *
getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
/// \return debug info descriptor for vtable.
llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);

/// \return namespace descriptor for the given namespace decl.
llvm::DINamespace *getOrCreateNamespace(const NamespaceDecl *N);
llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
                                    QualType PointeeTy, llvm::DIFile *F);
llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);

/// A helper function to create a subprogram for a single member
/// function GlobalDecl.
llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
                                            llvm::DIFile *F,
                                            llvm::DIType *RecordTy);

/// A helper function to collect debug info for C++ member
/// functions. This is used while creating debug info entry for a
/// Record.
void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
                               SmallVectorImpl<llvm::Metadata *> &E,
                               llvm::DIType *T);

/// A helper function to collect debug info for C++ base
/// classes. This is used while creating debug info entry for a
/// Record.
void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
                     SmallVectorImpl<llvm::Metadata *> &EltTys,
                     llvm::DIType *RecordTy);

/// Helper function for CollectCXXBases.
/// Adds debug info entries for types in Bases that are not in SeenTypes.
void 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);

/// A helper function to collect template parameters.
llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
                                        ArrayRef<TemplateArgument> TAList,
                                        llvm::DIFile *Unit);
/// A helper function to collect debug info for function template
/// parameters.
llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
                                                llvm::DIFile *Unit);

/// A helper function to collect debug info for template
/// parameters.
llvm::DINodeArray
CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
                         llvm::DIFile *F);

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

llvm::DIType *createFieldType(StringRef name, QualType type,
                              SourceLocation loc, AccessSpecifier AS,
                              uint64_t offsetInBits, llvm::DIFile *tunit,
                              llvm::DIScope *scope,
                              const RecordDecl *RD = nullptr) {
  return createFieldType(name, type, loc, AS, offsetInBits, 0, tunit, scope,
                         RD);
}

/// Create new bit field member.
llvm::DIType *createBitFieldType(const FieldDecl *BitFieldDecl,
                                 llvm::DIScope *RecordTy,
                                 const RecordDecl *RD);

/// Helpers for collecting fields of a record.
/// @{
void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
                               SmallVectorImpl<llvm::Metadata *> &E,
                               llvm::DIType *RecordTy);
llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var,
                                             llvm::DIType *RecordTy,
                                             const RecordDecl *RD);
void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
                              llvm::DIFile *F,
                              SmallVectorImpl<llvm::Metadata *> &E,
                              llvm::DIType *RecordTy, const RecordDecl *RD);
void CollectRecordNestedType(const TypeDecl *RD,
                             SmallVectorImpl<llvm::Metadata *> &E);
void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
                         SmallVectorImpl<llvm::Metadata *> &E,
                         llvm::DICompositeType *RecordTy);

/// If the C++ class has vtable info then insert appropriate debug
/// info entry in EltTys vector.
void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
                       SmallVectorImpl<llvm::Metadata *> &EltTys,
                       llvm::DICompositeType *RecordTy);
/// @}

/// Create a new lexical block node and push it on the stack.
void CreateLexicalBlock(SourceLocation Loc);

/// If target-specific LLVM \p AddressSpace directly maps to target-specific
/// DWARF address space, appends extended dereferencing mechanism to complex
/// expression \p Expr. Otherwise, does nothing.
///
/// Extended dereferencing mechanism is has the following format:
///     DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef
void AppendAddressSpaceXDeref(unsigned AddressSpace,
                              SmallVectorImpl<int64_t> &Expr) const;

311public:
CGDebugInfo(CodeGenModule &CGM);
~CGDebugInfo();

void finalize();

/// Register VLA size expression debug node with the qualified type.
void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr) {
  SizeExprCache[Ty] = SizeExpr;
}

/// Module debugging: Support for building PCMs.
/// @{
/// Set the main CU's DwoId field to \p Signature.
void setDwoId(uint64_t Signature);

/// When generating debug information for a clang module or
/// precompiled header, this module map will be used to determine
/// the module of origin of each Decl.
void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }

/// When generating debug information for a clang module or
/// precompiled header, this module map will be used to determine
/// the module of origin of each Decl.
void setPCHDescriptor(ExternalASTSource::ASTSourceDescriptor PCH) {
  PCHDescriptor = PCH;
}
/// @}

/// Update the current source location. If \arg loc is invalid it is
/// ignored.
void setLocation(SourceLocation Loc);

/// Return the current source location. This does not necessarily correspond
/// to the IRBuilder's current DebugLoc.
SourceLocation getLocation() const { return CurLoc; }

/// Update the current inline scope. All subsequent calls to \p EmitLocation
/// will create a location with this inlinedAt field.
void setInlinedAt(llvm::MDNode *InlinedAt) { CurInlinedAt = InlinedAt; }

/// \return the current inline scope.
llvm::MDNode *getInlinedAt() const { return CurInlinedAt; }

// Converts a SourceLocation to a DebugLoc
llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Loc);

/// Emit metadata to indicate a change in line/column information in
/// the source file. If the location is invalid, the previous
/// location will be reused.
void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);

/// Emit a call to llvm.dbg.function.start to indicate
/// start of a new function.
/// \param Loc       The location of the function header.
/// \param ScopeLoc  The location of the function body.
void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
                       SourceLocation ScopeLoc, QualType FnType,
                       llvm::Function *Fn, CGBuilderTy &Builder);

/// Start a new scope for an inlined function.
void EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD);
/// End an inlined function scope.
void EmitInlineFunctionEnd(CGBuilderTy &Builder);

/// Emit debug info for a function declaration.
void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType);

/// Constructs the debug code for exiting a function.
void EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn);

/// Emit metadata to indicate the beginning of a new lexical block
/// and push the block onto the stack.
void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);

/// Emit metadata to indicate the end of a new lexical block and pop
/// the current block.
void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);

/// Emit call to \c llvm.dbg.declare for an automatic variable
/// declaration.
/// Returns a pointer to the DILocalVariable associated with the
/// llvm.dbg.declare, or nullptr otherwise.
llvm::DILocalVariable *EmitDeclareOfAutoVariable(const VarDecl *Decl,
                                                 llvm::Value *AI,
                                                 CGBuilderTy &Builder);

/// Emit call to \c llvm.dbg.declare for an imported variable
/// declaration in a block.
void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
                                       llvm::Value *storage,
                                       CGBuilderTy &Builder,
                                       const CGBlockInfo &blockInfo,
                                       llvm::Instruction *InsertPoint = nullptr);

/// Emit call to \c llvm.dbg.declare for an argument variable
/// declaration.
void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
                              unsigned ArgNo, CGBuilderTy &Builder);

/// Emit call to \c llvm.dbg.declare for the block-literal argument
/// to a block invocation function.
void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
                                          StringRef Name, unsigned ArgNo,
                                          llvm::AllocaInst *LocalAddr,
                                          CGBuilderTy &Builder);

/// Emit information about a global variable.
void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);

/// Emit a constant global variable's debug info.
void EmitGlobalVariable(const ValueDecl *VD, const APValue &Init);

/// Emit C++ using directive.
void EmitUsingDirective(const UsingDirectiveDecl &UD);

/// Emit the type explicitly casted to.
void EmitExplicitCastType(QualType Ty);

/// Emit C++ using declaration.
void EmitUsingDecl(const UsingDecl &UD);

/// Emit an @import declaration.
void EmitImportDecl(const ImportDecl &ID);

/// Emit C++ namespace alias.
llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);

/// Emit record type's standalone debug info.
llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);

/// Emit an Objective-C interface type standalone debug info.
llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);

/// Emit standalone debug info for a type.
llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);

void completeType(const EnumDecl *ED);
void completeType(const RecordDecl *RD);
void completeRequiredType(const RecordDecl *RD);
void completeClassData(const RecordDecl *RD);
void completeClass(const RecordDecl *RD);

void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
void completeUnusedClass(const CXXRecordDecl &D);

/// Create debug info for a macro defined by a #define directive or a macro
/// undefined by a #undef directive.
llvm::DIMacro *CreateMacro(llvm::DIMacroFile *Parent, unsigned MType,
                           SourceLocation LineLoc, StringRef Name,
                           StringRef Value);

/// Create debug info for a file referenced by an #include directive.
llvm::DIMacroFile *CreateTempMacroFile(llvm::DIMacroFile *Parent,
                                       SourceLocation LineLoc,
                                       SourceLocation FileLoc);

468private:
/// Emit call to llvm.dbg.declare for a variable declaration.
/// Returns a pointer to the DILocalVariable associated with the
/// llvm.dbg.declare, or nullptr otherwise.
llvm::DILocalVariable *EmitDeclare(const VarDecl *decl, llvm::Value *AI,
                                   llvm::Optional<unsigned> ArgNo,
                                   CGBuilderTy &Builder);

/// Build up structure info for the byref.  See \a BuildByRefType.
llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
                                           uint64_t *OffSet);

/// Get context info for the DeclContext of \p Decl.
llvm::DIScope *getDeclContextDescriptor(const Decl *D);
/// Get context info for a given DeclContext \p Decl.
llvm::DIScope *getContextDescriptor(const Decl *Context,
                                    llvm::DIScope *Default);

llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);

/// Create a forward decl for a RecordType in a given context.
llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
                                                llvm::DIScope *);

/// Return current directory name.
StringRef getCurrentDirname();

/// Create new compile unit.
void CreateCompileUnit();

/// Remap a given path with the current debug prefix map
std::string remapDIPath(StringRef) const;

/// Compute the file checksum debug info for input file ID.
Optional<llvm::DIFile::ChecksumKind>
computeChecksum(FileID FID, SmallString<32> &Checksum) const;

/// Get the source of the given file ID.
Optional<StringRef> getSource(const SourceManager &SM, FileID FID);

/// Get the file debug info descriptor for the input location.
llvm::DIFile *getOrCreateFile(SourceLocation Loc);

/// Get the file info for main compile unit.
llvm::DIFile *getOrCreateMainFile();

/// Get the type from the cache or create a new type if necessary.
llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);

/// Get a reference to a clang module.  If \p CreateSkeletonCU is true,
/// this also creates a split dwarf skeleton compile unit.
llvm::DIModule *
getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
                     bool CreateSkeletonCU);

/// DebugTypeExtRefs: If \p D originated in a clang module, return it.
llvm::DIModule *getParentModuleOrNull(const Decl *D);

/// Get the type from the cache or create a new partial type if
/// necessary.
llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
                                              llvm::DIFile *F);

/// Create type metadata for a source language type.
llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);

/// Create new member and increase Offset by FType's size.
llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
                               StringRef Name, uint64_t *Offset);

/// Retrieve the DIDescriptor, if any, for the canonical form of this
/// declaration.
llvm::DINode *getDeclarationOrDefinition(const Decl *D);

/// \return debug info descriptor to describe method
/// declaration for the given method definition.
llvm::DISubprogram *getFunctionDeclaration(const Decl *D);

/// \return debug info descriptor to describe in-class static data
/// member declaration for the given out-of-class definition.  If D
/// is an out-of-class definition of a static data member of a
/// class, find its corresponding in-class declaration.
llvm::DIDerivedType *
getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);

/// Helper that either creates a forward declaration or a stub.
llvm::DISubprogram *getFunctionFwdDeclOrStub(GlobalDecl GD, bool Stub);

/// Create a subprogram describing the forward declaration
/// represented in the given FunctionDecl wrapped in a GlobalDecl.
llvm::DISubprogram *getFunctionForwardDeclaration(GlobalDecl GD);

/// Create a DISubprogram describing the function
/// represented in the given FunctionDecl wrapped in a GlobalDecl.
llvm::DISubprogram *getFunctionStub(GlobalDecl GD);

/// Create a global variable describing the forward declaration
/// represented in the given VarDecl.
llvm::DIGlobalVariable *
getGlobalVariableForwardDeclaration(const VarDecl *VD);

/// Return a global variable that represents one of the collection of global
/// variables created for an anonmyous union.
///
/// Recursively collect all of the member fields of a global
/// anonymous decl and create static variables for them. The first
/// time this is called it needs to be on a union and then from
/// there we can have additional unnamed fields.
llvm::DIGlobalVariableExpression *
CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
                       unsigned LineNo, StringRef LinkageName,
                       llvm::GlobalVariable *Var, llvm::DIScope *DContext);

/// Get the printing policy for producing names for debug info.
PrintingPolicy getPrintingPolicy() const;

/// Get function name for the given FunctionDecl. If the name is
/// constructed on demand (e.g., C++ destructor) then the name is
/// stored on the side.
StringRef getFunctionName(const FunctionDecl *FD);

/// Returns the unmangled name of an Objective-C method.
/// This is the display name for the debugging info.
StringRef getObjCMethodName(const ObjCMethodDecl *FD);

/// Return selector name. This is used for debugging
/// info.
StringRef getSelectorName(Selector S);

/// Get class name including template argument list.
StringRef getClassName(const RecordDecl *RD);

/// Get the vtable name for the given class.
StringRef getVTableName(const CXXRecordDecl *Decl);

/// Get line number for the location. If location is invalid
/// then use current location.
unsigned getLineNumber(SourceLocation Loc);

/// Get column number for the location. If location is
/// invalid then use current location.
/// \param Force  Assume DebugColumnInfo option is true.
unsigned getColumnNumber(SourceLocation Loc, bool Force = false);

/// Collect various properties of a FunctionDecl.
/// \param GD  A GlobalDecl whose getDecl() must return a FunctionDecl.
void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
                              StringRef &Name, StringRef &LinkageName,
                              llvm::DIScope *&FDContext,
                              llvm::DINodeArray &TParamsArray,
                              llvm::DINode::DIFlags &Flags);

/// Collect various properties of a VarDecl.
void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
                         unsigned &LineNo, QualType &T, StringRef &Name,
                         StringRef &LinkageName, llvm::DIScope *&VDContext);

/// Allocate a copy of \p A using the DebugInfoNames allocator
/// and return a reference to it. If multiple arguments are given the strings
/// are concatenated.
StringRef internString(StringRef A, StringRef B = StringRef()) {
  char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
  if (!A.empty())
13
←
Assuming the condition is false→
14
←
Taking false branch→
    std::memcpy(Data, A.data(), A.size());
  if (!B.empty())
15
←
Assuming the condition is true→
16
←
Taking true branch→
    std::memcpy(Data + A.size(), B.data(), B.size());
17
←
Null pointer passed as an argument to a 'nonnull' parameter
  return StringRef(Data, A.size() + B.size());
}
636};

638/// A scoped helper to set the current debug location to the specified
639/// location or preferred location of the specified Expr.
640class ApplyDebugLocation {
641private:
void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
                   SourceLocation TemporaryLocation);

llvm::DebugLoc OriginalLocation;
CodeGenFunction *CGF;

649public:
/// Set the location to the (valid) TemporaryLocation.
ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) {
  Other.CGF = nullptr;
}

~ApplyDebugLocation();

/// \brief Apply TemporaryLocation if it is valid. Otherwise switch
/// to an artificial debug location that has a valid scope, but no
/// line information.
///
/// Artificial locations are useful when emitting compiler-generated
/// helper functions that have no source location associated with
/// them. The DWARF specification allows the compiler to use the
/// special line number 0 to indicate code that can not be
/// attributed to any source location. Note that passing an empty
/// SourceLocation to CGDebugInfo::setLocation() will result in the
/// last valid location being reused.
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) {
  return ApplyDebugLocation(CGF, false, SourceLocation());
}
/// \brief Apply TemporaryLocation if it is valid. Otherwise switch
/// to an artificial debug location that has a valid scope, but no
/// line information.
static ApplyDebugLocation
CreateDefaultArtificial(CodeGenFunction &CGF,
                        SourceLocation TemporaryLocation) {
  return ApplyDebugLocation(CGF, false, TemporaryLocation);
}

/// Set the IRBuilder to not attach debug locations.  Note that
/// passing an empty SourceLocation to \a CGDebugInfo::setLocation()
/// will result in the last valid location being reused.  Note that
/// all instructions that do not have a location at the beginning of
/// a function are counted towards to function prologue.
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) {
  return ApplyDebugLocation(CGF, true, SourceLocation());
}

692};

694/// A scoped helper to set the current debug location to an inlined location.
695class ApplyInlineDebugLocation {
SourceLocation SavedLocation;
CodeGenFunction *CGF;

699public:
/// Set up the CodeGenFunction's DebugInfo to produce inline locations for the
/// function \p InlinedFn. The current debug location becomes the inlined call
/// site of the inlined function.
ApplyInlineDebugLocation(CodeGenFunction &CGF, GlobalDecl InlinedFn);
/// Restore everything back to the orginial state.
~ApplyInlineDebugLocation();
706};

708} // namespace CodeGen
709} // namespace clang

711#endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H