/build/source/clang/lib/AST/ItaniumMangle.cpp

Bug Summary

File:	build/source/clang/lib/AST/ItaniumMangle.cpp
Warning:	line 1049, column 7 Forming reference to null pointer
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name ItaniumMangle.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/source/build-llvm -resource-dir /usr/lib/llvm-17/lib/clang/17 -D _DEBUG -D _GLIBCXX_ASSERTIONS -D _GNU_SOURCE -D _LIBCPP_ENABLE_ASSERTIONS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/AST -I /build/source/clang/lib/AST -I /build/source/clang/include -I tools/clang/include -I include -I /build/source/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-17/lib/clang/17/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/source/build-llvm=build-llvm -fmacro-prefix-map=/build/source/= -fcoverage-prefix-map=/build/source/build-llvm=build-llvm -fcoverage-prefix-map=/build/source/= -source-date-epoch 1679443490 -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-misleading-indentation -std=c++17 -fdeprecated-macro -fdebug-compilation-dir=/build/source/build-llvm -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2023-03-22-005342-16304-1 -x c++ /build/source/clang/lib/AST/ItaniumMangle.cpp
1//===--- ItaniumMangle.cpp - Itanium C++ Name Mangling ----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Implements C++ name mangling according to the Itanium C++ ABI,
10// which is used in GCC 3.2 and newer (and many compilers that are
11// ABI-compatible with GCC):
12//
13//   http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling
14//
15//===----------------------------------------------------------------------===//

17#include "clang/AST/ASTContext.h"
18#include "clang/AST/Attr.h"
19#include "clang/AST/Decl.h"
20#include "clang/AST/DeclCXX.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/DeclOpenMP.h"
23#include "clang/AST/DeclTemplate.h"
24#include "clang/AST/Expr.h"
25#include "clang/AST/ExprCXX.h"
26#include "clang/AST/ExprConcepts.h"
27#include "clang/AST/ExprObjC.h"
28#include "clang/AST/Mangle.h"
29#include "clang/AST/TypeLoc.h"
30#include "clang/Basic/ABI.h"
31#include "clang/Basic/Module.h"
32#include "clang/Basic/SourceManager.h"
33#include "clang/Basic/TargetInfo.h"
34#include "clang/Basic/Thunk.h"
35#include "llvm/ADT/StringExtras.h"
36#include "llvm/Support/ErrorHandling.h"
37#include "llvm/Support/raw_ostream.h"
38#include <optional>

40using namespace clang;

42namespace {

44static bool isLocalContainerContext(const DeclContext *DC) {
return isa<FunctionDecl>(DC) || isa<ObjCMethodDecl>(DC) || isa<BlockDecl>(DC);
46}

48static const FunctionDecl *getStructor(const FunctionDecl *fn) {
if (const FunctionTemplateDecl *ftd = fn->getPrimaryTemplate())
  return ftd->getTemplatedDecl();

return fn;
53}

55static const NamedDecl *getStructor(const NamedDecl *decl) {
const FunctionDecl *fn = dyn_cast_or_null<FunctionDecl>(decl);
return (fn ? getStructor(fn) : decl);
58}

60static bool isLambda(const NamedDecl *ND) {
const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(ND);
if (!Record)
  return false;

return Record->isLambda();
66}

68static const unsigned UnknownArity = ~0U;

70class ItaniumMangleContextImpl : public ItaniumMangleContext {
typedef std::pair<const DeclContext*, IdentifierInfo*> DiscriminatorKeyTy;
llvm::DenseMap<DiscriminatorKeyTy, unsigned> Discriminator;
llvm::DenseMap<const NamedDecl*, unsigned> Uniquifier;
const DiscriminatorOverrideTy DiscriminatorOverride = nullptr;
NamespaceDecl *StdNamespace = nullptr;

bool NeedsUniqueInternalLinkageNames = false;

79public:
explicit ItaniumMangleContextImpl(
    ASTContext &Context, DiagnosticsEngine &Diags,
    DiscriminatorOverrideTy DiscriminatorOverride, bool IsAux = false)
    : ItaniumMangleContext(Context, Diags, IsAux),
      DiscriminatorOverride(DiscriminatorOverride) {}

/// @name Mangler Entry Points
/// @{

bool shouldMangleCXXName(const NamedDecl *D) override;
bool shouldMangleStringLiteral(const StringLiteral *) override {
  return false;
}

bool isUniqueInternalLinkageDecl(const NamedDecl *ND) override;
void needsUniqueInternalLinkageNames() override {
  NeedsUniqueInternalLinkageNames = true;
}

void mangleCXXName(GlobalDecl GD, raw_ostream &) override;
void mangleThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk,
                 raw_ostream &) override;
void mangleCXXDtorThunk(const CXXDestructorDecl *DD, CXXDtorType Type,
                        const ThisAdjustment &ThisAdjustment,
                        raw_ostream &) override;
void mangleReferenceTemporary(const VarDecl *D, unsigned ManglingNumber,
                              raw_ostream &) override;
void mangleCXXVTable(const CXXRecordDecl *RD, raw_ostream &) override;
void mangleCXXVTT(const CXXRecordDecl *RD, raw_ostream &) override;
void mangleCXXCtorVTable(const CXXRecordDecl *RD, int64_t Offset,
                         const CXXRecordDecl *Type, raw_ostream &) override;
void mangleCXXRTTI(QualType T, raw_ostream &) override;
void mangleCXXRTTIName(QualType T, raw_ostream &,
                       bool NormalizeIntegers) override;
void mangleTypeName(QualType T, raw_ostream &,
                    bool NormalizeIntegers) override;

void mangleCXXCtorComdat(const CXXConstructorDecl *D, raw_ostream &) override;
void mangleCXXDtorComdat(const CXXDestructorDecl *D, raw_ostream &) override;
void mangleStaticGuardVariable(const VarDecl *D, raw_ostream &) override;
void mangleDynamicInitializer(const VarDecl *D, raw_ostream &Out) override;
void mangleDynamicAtExitDestructor(const VarDecl *D,
                                   raw_ostream &Out) override;
void mangleDynamicStermFinalizer(const VarDecl *D, raw_ostream &Out) override;
void mangleSEHFilterExpression(GlobalDecl EnclosingDecl,
                               raw_ostream &Out) override;
void mangleSEHFinallyBlock(GlobalDecl EnclosingDecl,
                           raw_ostream &Out) override;
void mangleItaniumThreadLocalInit(const VarDecl *D, raw_ostream &) override;
void mangleItaniumThreadLocalWrapper(const VarDecl *D,
                                     raw_ostream &) override;

void mangleStringLiteral(const StringLiteral *, raw_ostream &) override;

void mangleLambdaSig(const CXXRecordDecl *Lambda, raw_ostream &) override;

void mangleModuleInitializer(const Module *Module, raw_ostream &) override;

bool getNextDiscriminator(const NamedDecl *ND, unsigned &disc) {
  // Lambda closure types are already numbered.
  if (isLambda(ND))
    return false;

  // Anonymous tags are already numbered.
  if (const TagDecl *Tag = dyn_cast<TagDecl>(ND)) {
    if (Tag->getName().empty() && !Tag->getTypedefNameForAnonDecl())
      return false;
  }

  // Use the canonical number for externally visible decls.
  if (ND->isExternallyVisible()) {
    unsigned discriminator = getASTContext().getManglingNumber(ND, isAux());
    if (discriminator == 1)
      return false;
    disc = discriminator - 2;
    return true;
  }

  // Make up a reasonable number for internal decls.
  unsigned &discriminator = Uniquifier[ND];
  if (!discriminator) {
    const DeclContext *DC = getEffectiveDeclContext(ND);
    discriminator = ++Discriminator[std::make_pair(DC, ND->getIdentifier())];
  }
  if (discriminator == 1)
    return false;
  disc = discriminator-2;
  return true;
}

std::string getLambdaString(const CXXRecordDecl *Lambda) override {
  // This function matches the one in MicrosoftMangle, which returns
  // the string that is used in lambda mangled names.
  assert(Lambda->isLambda() && "RD must be a lambda!")(static_cast <bool> (Lambda->isLambda() && "RD must be a lambda!"
) ? void (0) : __assert_fail ("Lambda->isLambda() && \"RD must be a lambda!\""
, "clang/lib/AST/ItaniumMangle.cpp", 173, __extension__ __PRETTY_FUNCTION__
));
  std::string Name("<lambda");
  Decl *LambdaContextDecl = Lambda->getLambdaContextDecl();
  unsigned LambdaManglingNumber = Lambda->getLambdaManglingNumber();
  unsigned LambdaId;
  const ParmVarDecl *Parm = dyn_cast_or_null<ParmVarDecl>(LambdaContextDecl);
  const FunctionDecl *Func =
      Parm ? dyn_cast<FunctionDecl>(Parm->getDeclContext()) : nullptr;

  if (Func) {
    unsigned DefaultArgNo =
        Func->getNumParams() - Parm->getFunctionScopeIndex();
    Name += llvm::utostr(DefaultArgNo);
    Name += "_";
  }

  if (LambdaManglingNumber)
    LambdaId = LambdaManglingNumber;
  else
    LambdaId = getAnonymousStructIdForDebugInfo(Lambda);

  Name += llvm::utostr(LambdaId);
  Name += '>';
  return Name;
}

DiscriminatorOverrideTy getDiscriminatorOverride() const override {
  return DiscriminatorOverride;
}

NamespaceDecl *getStdNamespace();

const DeclContext *getEffectiveDeclContext(const Decl *D);
const DeclContext *getEffectiveParentContext(const DeclContext *DC) {
  return getEffectiveDeclContext(cast<Decl>(DC));
}

bool isInternalLinkageDecl(const NamedDecl *ND);
const DeclContext *IgnoreLinkageSpecDecls(const DeclContext *DC);

/// @}
214};

216/// Manage the mangling of a single name.
217class CXXNameMangler {
ItaniumMangleContextImpl &Context;
raw_ostream &Out;
/// Normalize integer types for cross-language CFI support with other
/// languages that can't represent and encode C/C++ integer types.
bool NormalizeIntegers = false;

bool NullOut = false;
/// In the "DisableDerivedAbiTags" mode derived ABI tags are not calculated.
/// This mode is used when mangler creates another mangler recursively to
/// calculate ABI tags for the function return value or the variable type.
/// Also it is required to avoid infinite recursion in some cases.
bool DisableDerivedAbiTags = false;

/// The "structor" is the top-level declaration being mangled, if
/// that's not a template specialization; otherwise it's the pattern
/// for that specialization.
const NamedDecl *Structor;
unsigned StructorType = 0;

/// The next substitution sequence number.
unsigned SeqID = 0;

class FunctionTypeDepthState {
  unsigned Bits;

  enum { InResultTypeMask = 1 };

public:
  FunctionTypeDepthState() : Bits(0) {}

  /// The number of function types we're inside.
  unsigned getDepth() const {
    return Bits >> 1;
  }

  /// True if we're in the return type of the innermost function type.
  bool isInResultType() const {
    return Bits & InResultTypeMask;
  }

  FunctionTypeDepthState push() {
    FunctionTypeDepthState tmp = *this;
    Bits = (Bits & ~InResultTypeMask) + 2;
    return tmp;
  }

  void enterResultType() {
    Bits |= InResultTypeMask;
  }

  void leaveResultType() {
    Bits &= ~InResultTypeMask;
  }

  void pop(FunctionTypeDepthState saved) {
    assert(getDepth() == saved.getDepth() + 1)(static_cast <bool> (getDepth() == saved.getDepth() + 1
) ? void (0) : __assert_fail ("getDepth() == saved.getDepth() + 1"
, "clang/lib/AST/ItaniumMangle.cpp", 273, __extension__ __PRETTY_FUNCTION__
));
    Bits = saved.Bits;
  }

} FunctionTypeDepth;

// abi_tag is a gcc attribute, taking one or more strings called "tags".
// The goal is to annotate against which version of a library an object was
// built and to be able to provide backwards compatibility ("dual abi").
// For more information see docs/ItaniumMangleAbiTags.rst.
typedef SmallVector<StringRef, 4> AbiTagList;

// State to gather all implicit and explicit tags used in a mangled name.
// Must always have an instance of this while emitting any name to keep
// track.
class AbiTagState final {
public:
  explicit AbiTagState(AbiTagState *&Head) : LinkHead(Head) {
    Parent = LinkHead;
    LinkHead = this;
  }

  // No copy, no move.
  AbiTagState(const AbiTagState &) = delete;
  AbiTagState &operator=(const AbiTagState &) = delete;

  ~AbiTagState() { pop(); }

  void write(raw_ostream &Out, const NamedDecl *ND,
             const AbiTagList *AdditionalAbiTags) {
    ND = cast<NamedDecl>(ND->getCanonicalDecl());
    if (!isa<FunctionDecl>(ND) && !isa<VarDecl>(ND)) {
      assert((static_cast <bool> (!AdditionalAbiTags && "only function and variables need a list of additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"only function and variables need a list of additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 307, __extension__ __PRETTY_FUNCTION__
))
          !AdditionalAbiTags &&(static_cast <bool> (!AdditionalAbiTags && "only function and variables need a list of additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"only function and variables need a list of additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 307, __extension__ __PRETTY_FUNCTION__
))
          "only function and variables need a list of additional abi tags")(static_cast <bool> (!AdditionalAbiTags && "only function and variables need a list of additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"only function and variables need a list of additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 307, __extension__ __PRETTY_FUNCTION__
));
      if (const auto *NS = dyn_cast<NamespaceDecl>(ND)) {
        if (const auto *AbiTag = NS->getAttr<AbiTagAttr>()) {
          UsedAbiTags.insert(UsedAbiTags.end(), AbiTag->tags().begin(),
                             AbiTag->tags().end());
        }
        // Don't emit abi tags for namespaces.
        return;
      }
    }

    AbiTagList TagList;
    if (const auto *AbiTag = ND->getAttr<AbiTagAttr>()) {
      UsedAbiTags.insert(UsedAbiTags.end(), AbiTag->tags().begin(),
                         AbiTag->tags().end());
      TagList.insert(TagList.end(), AbiTag->tags().begin(),
                     AbiTag->tags().end());
    }

    if (AdditionalAbiTags) {
      UsedAbiTags.insert(UsedAbiTags.end(), AdditionalAbiTags->begin(),
                         AdditionalAbiTags->end());
      TagList.insert(TagList.end(), AdditionalAbiTags->begin(),
                     AdditionalAbiTags->end());
    }

    llvm::sort(TagList);
    TagList.erase(std::unique(TagList.begin(), TagList.end()), TagList.end());

    writeSortedUniqueAbiTags(Out, TagList);
  }

  const AbiTagList &getUsedAbiTags() const { return UsedAbiTags; }
  void setUsedAbiTags(const AbiTagList &AbiTags) {
    UsedAbiTags = AbiTags;
  }

  const AbiTagList &getEmittedAbiTags() const {
    return EmittedAbiTags;
  }

  const AbiTagList &getSortedUniqueUsedAbiTags() {
    llvm::sort(UsedAbiTags);
    UsedAbiTags.erase(std::unique(UsedAbiTags.begin(), UsedAbiTags.end()),
                      UsedAbiTags.end());
    return UsedAbiTags;
  }

private:
  //! All abi tags used implicitly or explicitly.
  AbiTagList UsedAbiTags;
  //! All explicit abi tags (i.e. not from namespace).
  AbiTagList EmittedAbiTags;

  AbiTagState *&LinkHead;
  AbiTagState *Parent = nullptr;

  void pop() {
    assert(LinkHead == this &&(static_cast <bool> (LinkHead == this && "abi tag link head must point to us on destruction"
) ? void (0) : __assert_fail ("LinkHead == this && \"abi tag link head must point to us on destruction\""
, "clang/lib/AST/ItaniumMangle.cpp", 366, __extension__ __PRETTY_FUNCTION__
))
           "abi tag link head must point to us on destruction")(static_cast <bool> (LinkHead == this && "abi tag link head must point to us on destruction"
) ? void (0) : __assert_fail ("LinkHead == this && \"abi tag link head must point to us on destruction\""
, "clang/lib/AST/ItaniumMangle.cpp", 366, __extension__ __PRETTY_FUNCTION__
));
    if (Parent) {
      Parent->UsedAbiTags.insert(Parent->UsedAbiTags.end(),
                                 UsedAbiTags.begin(), UsedAbiTags.end());
      Parent->EmittedAbiTags.insert(Parent->EmittedAbiTags.end(),
                                    EmittedAbiTags.begin(),
                                    EmittedAbiTags.end());
    }
    LinkHead = Parent;
  }

  void writeSortedUniqueAbiTags(raw_ostream &Out, const AbiTagList &AbiTags) {
    for (const auto &Tag : AbiTags) {
      EmittedAbiTags.push_back(Tag);
      Out << "B";
      Out << Tag.size();
      Out << Tag;
    }
  }
};

AbiTagState *AbiTags = nullptr;
AbiTagState AbiTagsRoot;

llvm::DenseMap<uintptr_t, unsigned> Substitutions;
llvm::DenseMap<StringRef, unsigned> ModuleSubstitutions;

ASTContext &getASTContext() const { return Context.getASTContext(); }

bool isStd(const NamespaceDecl *NS);
bool isStdNamespace(const DeclContext *DC);

const RecordDecl *GetLocalClassDecl(const Decl *D);
const DeclContext *IgnoreLinkageSpecDecls(const DeclContext *DC);
bool isSpecializedAs(QualType S, llvm::StringRef Name, QualType A);
bool isStdCharSpecialization(const ClassTemplateSpecializationDecl *SD,
                             llvm::StringRef Name, bool HasAllocator);

404public:
CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
               const NamedDecl *D = nullptr, bool NullOut_ = false)
    : Context(C), Out(Out_), NullOut(NullOut_), Structor(getStructor(D)),
      AbiTagsRoot(AbiTags) {
  // These can't be mangled without a ctor type or dtor type.
  assert(!D || (!isa<CXXDestructorDecl>(D) &&(static_cast <bool> (!D || (!isa<CXXDestructorDecl>
(D) && !isa<CXXConstructorDecl>(D))) ? void (0)
 : __assert_fail ("!D || (!isa<CXXDestructorDecl>(D) && !isa<CXXConstructorDecl>(D))"
, "clang/lib/AST/ItaniumMangle.cpp", 411, __extension__ __PRETTY_FUNCTION__
))
                !isa<CXXConstructorDecl>(D)))(static_cast <bool> (!D || (!isa<CXXDestructorDecl>
(D) && !isa<CXXConstructorDecl>(D))) ? void (0)
 : __assert_fail ("!D || (!isa<CXXDestructorDecl>(D) && !isa<CXXConstructorDecl>(D))"
, "clang/lib/AST/ItaniumMangle.cpp", 411, __extension__ __PRETTY_FUNCTION__
));
}
CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
               const CXXConstructorDecl *D, CXXCtorType Type)
    : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
      AbiTagsRoot(AbiTags) {}
CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
               const CXXDestructorDecl *D, CXXDtorType Type)
    : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
      AbiTagsRoot(AbiTags) {}

CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
               bool NormalizeIntegers_)
    : Context(C), Out(Out_), NormalizeIntegers(NormalizeIntegers_),
      NullOut(false), Structor(nullptr), AbiTagsRoot(AbiTags) {}
CXXNameMangler(CXXNameMangler &Outer, raw_ostream &Out_)
    : Context(Outer.Context), Out(Out_), Structor(Outer.Structor),
      StructorType(Outer.StructorType), SeqID(Outer.SeqID),
      FunctionTypeDepth(Outer.FunctionTypeDepth), AbiTagsRoot(AbiTags),
      Substitutions(Outer.Substitutions),
      ModuleSubstitutions(Outer.ModuleSubstitutions) {}

CXXNameMangler(CXXNameMangler &Outer, llvm::raw_null_ostream &Out_)
    : CXXNameMangler(Outer, (raw_ostream &)Out_) {
  NullOut = true;
}

raw_ostream &getStream() { return Out; }

void disableDerivedAbiTags() { DisableDerivedAbiTags = true; }
static bool shouldHaveAbiTags(ItaniumMangleContextImpl &C, const VarDecl *VD);

void mangle(GlobalDecl GD);
void mangleCallOffset(int64_t NonVirtual, int64_t Virtual);
void mangleNumber(const llvm::APSInt &I);
void mangleNumber(int64_t Number);
void mangleFloat(const llvm::APFloat &F);
void mangleFunctionEncoding(GlobalDecl GD);
void mangleSeqID(unsigned SeqID);
void mangleName(GlobalDecl GD);
void mangleType(QualType T);
void mangleNameOrStandardSubstitution(const NamedDecl *ND);
void mangleLambdaSig(const CXXRecordDecl *Lambda);
void mangleModuleNamePrefix(StringRef Name, bool IsPartition = false);

456private:

bool mangleSubstitution(const NamedDecl *ND);
bool mangleSubstitution(NestedNameSpecifier *NNS);
bool mangleSubstitution(QualType T);
bool mangleSubstitution(TemplateName Template);
bool mangleSubstitution(uintptr_t Ptr);

void mangleExistingSubstitution(TemplateName name);

bool mangleStandardSubstitution(const NamedDecl *ND);

void addSubstitution(const NamedDecl *ND) {
  ND = cast<NamedDecl>(ND->getCanonicalDecl());

  addSubstitution(reinterpret_cast<uintptr_t>(ND));
}
void addSubstitution(NestedNameSpecifier *NNS) {
  NNS = Context.getASTContext().getCanonicalNestedNameSpecifier(NNS);

  addSubstitution(reinterpret_cast<uintptr_t>(NNS));
}
void addSubstitution(QualType T);
void addSubstitution(TemplateName Template);
void addSubstitution(uintptr_t Ptr);
// Destructive copy substitutions from other mangler.
void extendSubstitutions(CXXNameMangler* Other);

void mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
                            bool recursive = false);
void mangleUnresolvedName(NestedNameSpecifier *qualifier,
                          DeclarationName name,
                          const TemplateArgumentLoc *TemplateArgs,
                          unsigned NumTemplateArgs,
                          unsigned KnownArity = UnknownArity);

void mangleFunctionEncodingBareType(const FunctionDecl *FD);

void mangleNameWithAbiTags(GlobalDecl GD,
                           const AbiTagList *AdditionalAbiTags);
void mangleModuleName(const NamedDecl *ND);
void mangleTemplateName(const TemplateDecl *TD,
                        ArrayRef<TemplateArgument> Args);
void mangleUnqualifiedName(GlobalDecl GD, const DeclContext *DC,
                           const AbiTagList *AdditionalAbiTags) {
  mangleUnqualifiedName(GD, cast<NamedDecl>(GD.getDecl())->getDeclName(), DC,
                        UnknownArity, AdditionalAbiTags);
}
void mangleUnqualifiedName(GlobalDecl GD, DeclarationName Name,
                           const DeclContext *DC, unsigned KnownArity,
                           const AbiTagList *AdditionalAbiTags);
void mangleUnscopedName(GlobalDecl GD, const DeclContext *DC,
                        const AbiTagList *AdditionalAbiTags);
void mangleUnscopedTemplateName(GlobalDecl GD, const DeclContext *DC,
                                const AbiTagList *AdditionalAbiTags);
void mangleSourceName(const IdentifierInfo *II);
void mangleRegCallName(const IdentifierInfo *II);
void mangleDeviceStubName(const IdentifierInfo *II);
void mangleSourceNameWithAbiTags(
    const NamedDecl *ND, const AbiTagList *AdditionalAbiTags = nullptr);
void mangleLocalName(GlobalDecl GD,
                     const AbiTagList *AdditionalAbiTags);
void mangleBlockForPrefix(const BlockDecl *Block);
void mangleUnqualifiedBlock(const BlockDecl *Block);
void mangleTemplateParamDecl(const NamedDecl *Decl);
void mangleLambda(const CXXRecordDecl *Lambda);
void mangleNestedName(GlobalDecl GD, const DeclContext *DC,
                      const AbiTagList *AdditionalAbiTags,
                      bool NoFunction=false);
void mangleNestedName(const TemplateDecl *TD,
                      ArrayRef<TemplateArgument> Args);
void mangleNestedNameWithClosurePrefix(GlobalDecl GD,
                                       const NamedDecl *PrefixND,
                                       const AbiTagList *AdditionalAbiTags);
void manglePrefix(NestedNameSpecifier *qualifier);
void manglePrefix(const DeclContext *DC, bool NoFunction=false);
void manglePrefix(QualType type);
void mangleTemplatePrefix(GlobalDecl GD, bool NoFunction=false);
void mangleTemplatePrefix(TemplateName Template);
const NamedDecl *getClosurePrefix(const Decl *ND);
void mangleClosurePrefix(const NamedDecl *ND, bool NoFunction = false);
bool mangleUnresolvedTypeOrSimpleId(QualType DestroyedType,
                                    StringRef Prefix = "");
void mangleOperatorName(DeclarationName Name, unsigned Arity);
void mangleOperatorName(OverloadedOperatorKind OO, unsigned Arity);
void mangleVendorQualifier(StringRef qualifier);
void mangleQualifiers(Qualifiers Quals, const DependentAddressSpaceType *DAST = nullptr);
void mangleRefQualifier(RefQualifierKind RefQualifier);

void mangleObjCMethodName(const ObjCMethodDecl *MD);

// Declare manglers for every type class.
548#define ABSTRACT_TYPE(CLASS, PARENT)
549#define NON_CANONICAL_TYPE(CLASS, PARENT)
550#define TYPE(CLASS, PARENT) void mangleType(const CLASS##Type *T);
551#include "clang/AST/TypeNodes.inc"

void mangleType(const TagType*);
void mangleType(TemplateName);
static StringRef getCallingConvQualifierName(CallingConv CC);
void mangleExtParameterInfo(FunctionProtoType::ExtParameterInfo info);
void mangleExtFunctionInfo(const FunctionType *T);
void mangleBareFunctionType(const FunctionProtoType *T, bool MangleReturnType,
                            const FunctionDecl *FD = nullptr);
void mangleNeonVectorType(const VectorType *T);
void mangleNeonVectorType(const DependentVectorType *T);
void mangleAArch64NeonVectorType(const VectorType *T);
void mangleAArch64NeonVectorType(const DependentVectorType *T);
void mangleAArch64FixedSveVectorType(const VectorType *T);
void mangleAArch64FixedSveVectorType(const DependentVectorType *T);

void mangleIntegerLiteral(QualType T, const llvm::APSInt &Value);
void mangleFloatLiteral(QualType T, const llvm::APFloat &V);
void mangleFixedPointLiteral();
void mangleNullPointer(QualType T);

void mangleMemberExprBase(const Expr *base, bool isArrow);
void mangleMemberExpr(const Expr *base, bool isArrow,
                      NestedNameSpecifier *qualifier,
                      NamedDecl *firstQualifierLookup,
                      DeclarationName name,
                      const TemplateArgumentLoc *TemplateArgs,
                      unsigned NumTemplateArgs,
                      unsigned knownArity);
void mangleCastExpression(const Expr *E, StringRef CastEncoding);
void mangleInitListElements(const InitListExpr *InitList);
void mangleExpression(const Expr *E, unsigned Arity = UnknownArity,
                      bool AsTemplateArg = false);
void mangleCXXCtorType(CXXCtorType T, const CXXRecordDecl *InheritedFrom);
void mangleCXXDtorType(CXXDtorType T);

void mangleTemplateArgs(TemplateName TN,
                        const TemplateArgumentLoc *TemplateArgs,
                        unsigned NumTemplateArgs);
void mangleTemplateArgs(TemplateName TN, ArrayRef<TemplateArgument> Args);
void mangleTemplateArgs(TemplateName TN, const TemplateArgumentList &AL);
void mangleTemplateArg(TemplateArgument A, bool NeedExactType);
void mangleTemplateArgExpr(const Expr *E);
void mangleValueInTemplateArg(QualType T, const APValue &V, bool TopLevel,
                              bool NeedExactType = false);

void mangleTemplateParameter(unsigned Depth, unsigned Index);

void mangleFunctionParam(const ParmVarDecl *parm);

void writeAbiTags(const NamedDecl *ND,
                  const AbiTagList *AdditionalAbiTags);

// Returns sorted unique list of ABI tags.
AbiTagList makeFunctionReturnTypeTags(const FunctionDecl *FD);
// Returns sorted unique list of ABI tags.
AbiTagList makeVariableTypeTags(const VarDecl *VD);
608};

610}

612NamespaceDecl *ItaniumMangleContextImpl::getStdNamespace() {
if (!StdNamespace) {
  StdNamespace = NamespaceDecl::Create(
      getASTContext(), getASTContext().getTranslationUnitDecl(),
      /*Inline=*/false, SourceLocation(), SourceLocation(),
      &getASTContext().Idents.get("std"),
      /*PrevDecl=*/nullptr, /*Nested=*/false);
  StdNamespace->setImplicit();
}
return StdNamespace;
622}

624/// Retrieve the declaration context that should be used when mangling the given
625/// declaration.
626const DeclContext *
627ItaniumMangleContextImpl::getEffectiveDeclContext(const Decl *D) {
// The ABI assumes that lambda closure types that occur within
// default arguments live in the context of the function. However, due to
// the way in which Clang parses and creates function declarations, this is
// not the case: the lambda closure type ends up living in the context
// where the function itself resides, because the function declaration itself
// had not yet been created. Fix the context here.
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) {
  if (RD->isLambda())
    if (ParmVarDecl *ContextParam =
            dyn_cast_or_null<ParmVarDecl>(RD->getLambdaContextDecl()))
      return ContextParam->getDeclContext();
}

// Perform the same check for block literals.
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
  if (ParmVarDecl *ContextParam =
          dyn_cast_or_null<ParmVarDecl>(BD->getBlockManglingContextDecl()))
    return ContextParam->getDeclContext();
}

// On ARM and AArch64, the va_list tag is always mangled as if in the std
// namespace. We do not represent va_list as actually being in the std
// namespace in C because this would result in incorrect debug info in C,
// among other things. It is important for both languages to have the same
// mangling in order for -fsanitize=cfi-icall to work.
if (D == getASTContext().getVaListTagDecl()) {
  const llvm::Triple &T = getASTContext().getTargetInfo().getTriple();
  if (T.isARM() || T.isThumb() || T.isAArch64())
    return getStdNamespace();
}

const DeclContext *DC = D->getDeclContext();
if (isa<CapturedDecl>(DC) || isa<OMPDeclareReductionDecl>(DC) ||
    isa<OMPDeclareMapperDecl>(DC)) {
  return getEffectiveDeclContext(cast<Decl>(DC));
}

if (const auto *VD = dyn_cast<VarDecl>(D))
  if (VD->isExternC())
    return getASTContext().getTranslationUnitDecl();

if (const auto *FD = dyn_cast<FunctionDecl>(D))
  if (FD->isExternC())
    return getASTContext().getTranslationUnitDecl();

return DC->getRedeclContext();
674}

676bool ItaniumMangleContextImpl::isInternalLinkageDecl(const NamedDecl *ND) {
if (ND && ND->getFormalLinkage() == InternalLinkage &&
    !ND->isExternallyVisible() &&
    getEffectiveDeclContext(ND)->isFileContext() &&
    !ND->isInAnonymousNamespace())
  return true;
return false;
683}

685// Check if this Function Decl needs a unique internal linkage name.
686bool ItaniumMangleContextImpl::isUniqueInternalLinkageDecl(
  const NamedDecl *ND) {
if (!NeedsUniqueInternalLinkageNames || !ND)
  return false;

const auto *FD = dyn_cast<FunctionDecl>(ND);
if (!FD)
  return false;

// For C functions without prototypes, return false as their
// names should not be mangled.
if (!FD->getType()->getAs<FunctionProtoType>())
  return false;

if (isInternalLinkageDecl(ND))
  return true;

return false;
704}

706bool ItaniumMangleContextImpl::shouldMangleCXXName(const NamedDecl *D) {
if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
  LanguageLinkage L = FD->getLanguageLinkage();
  // Overloadable functions need mangling.
  if (FD->hasAttr<OverloadableAttr>())
    return true;

  // "main" is not mangled.
  if (FD->isMain())
    return false;

  // The Windows ABI expects that we would never mangle "typical"
  // user-defined entry points regardless of visibility or freestanding-ness.
  //
  // N.B. This is distinct from asking about "main".  "main" has a lot of
  // special rules associated with it in the standard while these
  // user-defined entry points are outside of the purview of the standard.
  // For example, there can be only one definition for "main" in a standards
  // compliant program; however nothing forbids the existence of wmain and
  // WinMain in the same translation unit.
  if (FD->isMSVCRTEntryPoint())
    return false;

  // C++ functions and those whose names are not a simple identifier need
  // mangling.
  if (!FD->getDeclName().isIdentifier() || L == CXXLanguageLinkage)
    return true;

  // C functions are not mangled.
  if (L == CLanguageLinkage)
    return false;
}

// Otherwise, no mangling is done outside C++ mode.
if (!getASTContext().getLangOpts().CPlusPlus)
  return false;

if (const auto *VD = dyn_cast<VarDecl>(D)) {
  // Decompositions are mangled.
  if (isa<DecompositionDecl>(VD))
    return true;

  // C variables are not mangled.
  if (VD->isExternC())
    return false;

  // Variables at global scope are not mangled unless they have internal
  // linkage or are specializations or are attached to a named module.
  const DeclContext *DC = getEffectiveDeclContext(D);
  // Check for extern variable declared locally.
  if (DC->isFunctionOrMethod() && D->hasLinkage())
    while (!DC->isFileContext())
      DC = getEffectiveParentContext(DC);
  if (DC->isTranslationUnit() && D->getFormalLinkage() != InternalLinkage &&
      !CXXNameMangler::shouldHaveAbiTags(*this, VD) &&
      !isa<VarTemplateSpecializationDecl>(VD) &&
      !VD->getOwningModuleForLinkage())
    return false;
}

return true;
767}

769void CXXNameMangler::writeAbiTags(const NamedDecl *ND,
                                const AbiTagList *AdditionalAbiTags) {
assert(AbiTags && "require AbiTagState")(static_cast <bool> (AbiTags && "require AbiTagState"
) ? void (0) : __assert_fail ("AbiTags && \"require AbiTagState\""
, "clang/lib/AST/ItaniumMangle.cpp", 771, __extension__ __PRETTY_FUNCTION__
));
AbiTags->write(Out, ND, DisableDerivedAbiTags ? nullptr : AdditionalAbiTags);
773}

775void CXXNameMangler::mangleSourceNameWithAbiTags(
  const NamedDecl *ND, const AbiTagList *AdditionalAbiTags) {
mangleSourceName(ND->getIdentifier());
writeAbiTags(ND, AdditionalAbiTags);
779}

781void CXXNameMangler::mangle(GlobalDecl GD) {
// <mangled-name> ::= _Z <encoding>
//            ::= <data name>
//            ::= <special-name>
Out << "_Z";
if (isa<FunctionDecl>(GD.getDecl()))
  mangleFunctionEncoding(GD);
else if (isa<VarDecl, FieldDecl, MSGuidDecl, TemplateParamObjectDecl,
             BindingDecl>(GD.getDecl()))
  mangleName(GD);
else if (const IndirectFieldDecl *IFD =
             dyn_cast<IndirectFieldDecl>(GD.getDecl()))
  mangleName(IFD->getAnonField());
else
  llvm_unreachable("unexpected kind of global decl")::llvm::llvm_unreachable_internal("unexpected kind of global decl"
, "clang/lib/AST/ItaniumMangle.cpp", 795);
796}

798void CXXNameMangler::mangleFunctionEncoding(GlobalDecl GD) {
const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
// <encoding> ::= <function name> <bare-function-type>

// Don't mangle in the type if this isn't a decl we should typically mangle.
if (!Context.shouldMangleDeclName(FD)) {
  mangleName(GD);
  return;
}

AbiTagList ReturnTypeAbiTags = makeFunctionReturnTypeTags(FD);
if (ReturnTypeAbiTags.empty()) {
  // There are no tags for return type, the simplest case.
  mangleName(GD);
  mangleFunctionEncodingBareType(FD);
  return;
}

// Mangle function name and encoding to temporary buffer.
// We have to output name and encoding to the same mangler to get the same
// substitution as it will be in final mangling.
SmallString<256> FunctionEncodingBuf;
llvm::raw_svector_ostream FunctionEncodingStream(FunctionEncodingBuf);
CXXNameMangler FunctionEncodingMangler(*this, FunctionEncodingStream);
// Output name of the function.
FunctionEncodingMangler.disableDerivedAbiTags();
FunctionEncodingMangler.mangleNameWithAbiTags(FD, nullptr);

// Remember length of the function name in the buffer.
size_t EncodingPositionStart = FunctionEncodingStream.str().size();
FunctionEncodingMangler.mangleFunctionEncodingBareType(FD);

// Get tags from return type that are not present in function name or
// encoding.
const AbiTagList &UsedAbiTags =
    FunctionEncodingMangler.AbiTagsRoot.getSortedUniqueUsedAbiTags();
AbiTagList AdditionalAbiTags(ReturnTypeAbiTags.size());
AdditionalAbiTags.erase(
    std::set_difference(ReturnTypeAbiTags.begin(), ReturnTypeAbiTags.end(),
                        UsedAbiTags.begin(), UsedAbiTags.end(),
                        AdditionalAbiTags.begin()),
    AdditionalAbiTags.end());

// Output name with implicit tags and function encoding from temporary buffer.
mangleNameWithAbiTags(FD, &AdditionalAbiTags);
Out << FunctionEncodingStream.str().substr(EncodingPositionStart);

// Function encoding could create new substitutions so we have to add
// temp mangled substitutions to main mangler.
extendSubstitutions(&FunctionEncodingMangler);
848}

850void CXXNameMangler::mangleFunctionEncodingBareType(const FunctionDecl *FD) {
if (FD->hasAttr<EnableIfAttr>()) {
  FunctionTypeDepthState Saved = FunctionTypeDepth.push();
  Out << "Ua9enable_ifI";
  for (AttrVec::const_iterator I = FD->getAttrs().begin(),
                               E = FD->getAttrs().end();
       I != E; ++I) {
    EnableIfAttr *EIA = dyn_cast<EnableIfAttr>(*I);
    if (!EIA)
      continue;
    if (Context.getASTContext().getLangOpts().getClangABICompat() >
        LangOptions::ClangABI::Ver11) {
      mangleTemplateArgExpr(EIA->getCond());
    } else {
      // Prior to Clang 12, we hardcoded the X/E around enable-if's argument,
      // even though <template-arg> should not include an X/E around
      // <expr-primary>.
      Out << 'X';
      mangleExpression(EIA->getCond());
      Out << 'E';
    }
  }
  Out << 'E';
  FunctionTypeDepth.pop(Saved);
}

// When mangling an inheriting constructor, the bare function type used is
// that of the inherited constructor.
if (auto *CD = dyn_cast<CXXConstructorDecl>(FD))
  if (auto Inherited = CD->getInheritedConstructor())
    FD = Inherited.getConstructor();

// Whether the mangling of a function type includes the return type depends on
// the context and the nature of the function. The rules for deciding whether
// the return type is included are:
//
//   1. Template functions (names or types) have return types encoded, with
//   the exceptions listed below.
//   2. Function types not appearing as part of a function name mangling,
//   e.g. parameters, pointer types, etc., have return type encoded, with the
//   exceptions listed below.
//   3. Non-template function names do not have return types encoded.
//
// The exceptions mentioned in (1) and (2) above, for which the return type is
// never included, are
//   1. Constructors.
//   2. Destructors.
//   3. Conversion operator functions, e.g. operator int.
bool MangleReturnType = false;
if (FunctionTemplateDecl *PrimaryTemplate = FD->getPrimaryTemplate()) {
  if (!(isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD) ||
        isa<CXXConversionDecl>(FD)))
    MangleReturnType = true;

  // Mangle the type of the primary template.
  FD = PrimaryTemplate->getTemplatedDecl();
}

mangleBareFunctionType(FD->getType()->castAs<FunctionProtoType>(),
                       MangleReturnType, FD);
910}

912/// Return whether a given namespace is the 'std' namespace.
913bool CXXNameMangler::isStd(const NamespaceDecl *NS) {
if (!Context.getEffectiveParentContext(NS)->isTranslationUnit())
  return false;

const IdentifierInfo *II = NS->getOriginalNamespace()->getIdentifier();
return II && II->isStr("std");
919}

921// isStdNamespace - Return whether a given decl context is a toplevel 'std'
922// namespace.
923bool CXXNameMangler::isStdNamespace(const DeclContext *DC) {
if (!DC->isNamespace())
  return false;

return isStd(cast<NamespaceDecl>(DC));
928}

930static const GlobalDecl
931isTemplate(GlobalDecl GD, const TemplateArgumentList *&TemplateArgs) {
const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
21
←
The object is a 'CastReturnType'→
// Check if we have a function template.
if (const FunctionDecl *FD22.1
'FD' is null
 = dyn_cast<FunctionDecl>(ND)) {
22
←
Assuming 'ND' is not a 'CastReturnType'→
23
←
Taking false branch→
  if (const TemplateDecl *TD = FD->getPrimaryTemplate()) {
    TemplateArgs = FD->getTemplateSpecializationArgs();
    return GD.getWithDecl(TD);
  }
}

// Check if we have a class template.
if (const ClassTemplateSpecializationDecl *Spec24.1
'Spec' is null
 =
25
←
Taking false branch→
      dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
24
←
Assuming 'ND' is not a 'CastReturnType'→
  TemplateArgs = &Spec->getTemplateArgs();
  return GD.getWithDecl(Spec->getSpecializedTemplate());
}

// Check if we have a variable template.
if (const VarTemplateSpecializationDecl *Spec26.1
'Spec' is null
 =
27
←
Taking false branch→
        dyn_cast<VarTemplateSpecializationDecl>(ND)) {
26
←
Assuming 'ND' is not a 'CastReturnType'→
  TemplateArgs = &Spec->getTemplateArgs();
  return GD.getWithDecl(Spec->getSpecializedTemplate());
}

return GlobalDecl();
28
←
Returning without writing to 'TemplateArgs'→
956}

958static TemplateName asTemplateName(GlobalDecl GD) {
const TemplateDecl *TD = dyn_cast_or_null<TemplateDecl>(GD.getDecl());
return TemplateName(const_cast<TemplateDecl*>(TD));
961}

963void CXXNameMangler::mangleName(GlobalDecl GD) {
const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
4
←
The object is a 'CastReturnType'→
if (const VarDecl *VD5.1
'VD' is null
 = dyn_cast<VarDecl>(ND)) {
5
←
Assuming 'ND' is not a 'CastReturnType'→
6
←
Taking false branch→
  // Variables should have implicit tags from its type.
  AbiTagList VariableTypeAbiTags = makeVariableTypeTags(VD);
  if (VariableTypeAbiTags.empty()) {
    // Simple case no variable type tags.
    mangleNameWithAbiTags(VD, nullptr);
    return;
  }

  // Mangle variable name to null stream to collect tags.
  llvm::raw_null_ostream NullOutStream;
  CXXNameMangler VariableNameMangler(*this, NullOutStream);
  VariableNameMangler.disableDerivedAbiTags();
  VariableNameMangler.mangleNameWithAbiTags(VD, nullptr);

  // Get tags from variable type that are not present in its name.
  const AbiTagList &UsedAbiTags =
      VariableNameMangler.AbiTagsRoot.getSortedUniqueUsedAbiTags();
  AbiTagList AdditionalAbiTags(VariableTypeAbiTags.size());
  AdditionalAbiTags.erase(
      std::set_difference(VariableTypeAbiTags.begin(),
                          VariableTypeAbiTags.end(), UsedAbiTags.begin(),
                          UsedAbiTags.end(), AdditionalAbiTags.begin()),
      AdditionalAbiTags.end());

  // Output name with implicit tags.
  mangleNameWithAbiTags(VD, &AdditionalAbiTags);
} else {
  mangleNameWithAbiTags(GD, nullptr);
7
←
Calling 'CXXNameMangler::mangleNameWithAbiTags'→
}
995}

997const RecordDecl *CXXNameMangler::GetLocalClassDecl(const Decl *D) {
const DeclContext *DC = Context.getEffectiveDeclContext(D);
while (!DC->isNamespace() && !DC->isTranslationUnit()) {
  if (isLocalContainerContext(DC))
    return dyn_cast<RecordDecl>(D);
  D = cast<Decl>(DC);
  DC = Context.getEffectiveDeclContext(D);
}
return nullptr;
1006}

1008void CXXNameMangler::mangleNameWithAbiTags(GlobalDecl GD,
                                         const AbiTagList *AdditionalAbiTags) {
const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
8
←
The object is a 'CastReturnType'→
//  <name> ::= [<module-name>] <nested-name>
//         ::= [<module-name>] <unscoped-name>
//         ::= [<module-name>] <unscoped-template-name> <template-args>
//         ::= <local-name>
//
const DeclContext *DC = Context.getEffectiveDeclContext(ND);

// If this is an extern variable declared locally, the relevant DeclContext
// is that of the containing namespace, or the translation unit.
// FIXME: This is a hack; extern variables declared locally should have
// a proper semantic declaration context!
if (isLocalContainerContext(DC) && ND->hasLinkage() && !isLambda(ND))
  while (!DC->isNamespace() && !DC->isTranslationUnit())
    DC = Context.getEffectiveParentContext(DC);
else if (GetLocalClassDecl(ND)) {
9
←
Assuming the condition is false→
  mangleLocalName(GD, AdditionalAbiTags);
  return;
}

assert(!isa<LinkageSpecDecl>(DC) && "context cannot be LinkageSpecDecl")(static_cast <bool> (!isa<LinkageSpecDecl>(DC) &&
 "context cannot be LinkageSpecDecl") ? void (0) : __assert_fail
 ("!isa<LinkageSpecDecl>(DC) && \"context cannot be LinkageSpecDecl\""
, "clang/lib/AST/ItaniumMangle.cpp", 1030, __extension__ __PRETTY_FUNCTION__
));
10
←
Taking false branch→
11
←
Assuming 'DC' is not a 'LinkageSpecDecl'→
12
←
'?' condition is true→

if (isLocalContainerContext(DC)) {
13
←
Taking false branch→
  mangleLocalName(GD, AdditionalAbiTags);
  return;
}

// Closures can require a nested-name mangling even if they're semantically
// in the global namespace.
if (const NamedDecl *PrefixND18.1
'PrefixND' is null
 = getClosurePrefix(ND)) {
14
←
Calling 'CXXNameMangler::getClosurePrefix'→
18
←
Returning from 'CXXNameMangler::getClosurePrefix'→
  mangleNestedNameWithClosurePrefix(GD, PrefixND, AdditionalAbiTags);
  return;
}

if (DC->isTranslationUnit() || isStdNamespace(DC)) {
  // Check if we have a template.
  const TemplateArgumentList *TemplateArgs = nullptr;
19
←
'TemplateArgs' initialized to a null pointer value→
  if (GlobalDecl TD = isTemplate(GD, TemplateArgs)) {
20
←
Calling 'isTemplate'→
29
←
Returning from 'isTemplate'→
30
←
Assuming the condition is true→
31
←
Taking true branch→
    mangleUnscopedTemplateName(TD, DC, AdditionalAbiTags);
    mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
32
←
Forming reference to null pointer
    return;
  }

  mangleUnscopedName(GD, DC, AdditionalAbiTags);
  return;
}

mangleNestedName(GD, DC, AdditionalAbiTags);
1058}

1060void CXXNameMangler::mangleModuleName(const NamedDecl *ND) {
if (ND->isExternallyVisible())
  if (Module *M = ND->getOwningModuleForLinkage())
    mangleModuleNamePrefix(M->getPrimaryModuleInterfaceName());
1064}

1066// <module-name> ::= <module-subname>
1067//		 ::= <module-name> <module-subname>
1068//	 	 ::= <substitution>
1069// <module-subname> ::= W <source-name>
1070//		    ::= W P <source-name>
1071void CXXNameMangler::mangleModuleNamePrefix(StringRef Name, bool IsPartition) {
//  <substitution> ::= S <seq-id> _
auto It = ModuleSubstitutions.find(Name);
if (It != ModuleSubstitutions.end()) {
  Out << 'S';
  mangleSeqID(It->second);
  return;
}

// FIXME: Preserve hierarchy in module names rather than flattening
// them to strings; use Module*s as substitution keys.
auto Parts = Name.rsplit('.');
if (Parts.second.empty())
  Parts.second = Parts.first;
else {
  mangleModuleNamePrefix(Parts.first, IsPartition);
  IsPartition = false;
}

Out << 'W';
if (IsPartition)
  Out << 'P';
Out << Parts.second.size() << Parts.second;
ModuleSubstitutions.insert({Name, SeqID++});
1095}

1097void CXXNameMangler::mangleTemplateName(const TemplateDecl *TD,
                                      ArrayRef<TemplateArgument> Args) {
const DeclContext *DC = Context.getEffectiveDeclContext(TD);

if (DC->isTranslationUnit() || isStdNamespace(DC)) {
  mangleUnscopedTemplateName(TD, DC, nullptr);
  mangleTemplateArgs(asTemplateName(TD), Args);
} else {
  mangleNestedName(TD, Args);
}
1107}

1109void CXXNameMangler::mangleUnscopedName(GlobalDecl GD, const DeclContext *DC,
                                      const AbiTagList *AdditionalAbiTags) {
//  <unscoped-name> ::= <unqualified-name>
//                  ::= St <unqualified-name>   # ::std::

assert(!isa<LinkageSpecDecl>(DC) && "unskipped LinkageSpecDecl")(static_cast <bool> (!isa<LinkageSpecDecl>(DC) &&
 "unskipped LinkageSpecDecl") ? void (0) : __assert_fail ("!isa<LinkageSpecDecl>(DC) && \"unskipped LinkageSpecDecl\""
, "clang/lib/AST/ItaniumMangle.cpp", 1114, __extension__ __PRETTY_FUNCTION__
));
if (isStdNamespace(DC))
  Out << "St";

mangleUnqualifiedName(GD, DC, AdditionalAbiTags);
1119}

1121void CXXNameMangler::mangleUnscopedTemplateName(
  GlobalDecl GD, const DeclContext *DC, const AbiTagList *AdditionalAbiTags) {
const TemplateDecl *ND = cast<TemplateDecl>(GD.getDecl());
//     <unscoped-template-name> ::= <unscoped-name>
//                              ::= <substitution>
if (mangleSubstitution(ND))
  return;

// <template-template-param> ::= <template-param>
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) {
  assert(!AdditionalAbiTags &&(static_cast <bool> (!AdditionalAbiTags && "template template param cannot have abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"template template param cannot have abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1132, __extension__ __PRETTY_FUNCTION__
))
         "template template param cannot have abi tags")(static_cast <bool> (!AdditionalAbiTags && "template template param cannot have abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"template template param cannot have abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1132, __extension__ __PRETTY_FUNCTION__
));
  mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
} else if (isa<BuiltinTemplateDecl>(ND) || isa<ConceptDecl>(ND)) {
  mangleUnscopedName(GD, DC, AdditionalAbiTags);
} else {
  mangleUnscopedName(GD.getWithDecl(ND->getTemplatedDecl()), DC,
                     AdditionalAbiTags);
}

addSubstitution(ND);
1142}

1144void CXXNameMangler::mangleFloat(const llvm::APFloat &f) {
// ABI:
//   Floating-point literals are encoded using a fixed-length
//   lowercase hexadecimal string corresponding to the internal
//   representation (IEEE on Itanium), high-order bytes first,
//   without leading zeroes. For example: "Lf bf800000 E" is -1.0f
//   on Itanium.
// The 'without leading zeroes' thing seems to be an editorial
// mistake; see the discussion on cxx-abi-dev beginning on
// 2012-01-16.

// Our requirements here are just barely weird enough to justify
// using a custom algorithm instead of post-processing APInt::toString().

llvm::APInt valueBits = f.bitcastToAPInt();
unsigned numCharacters = (valueBits.getBitWidth() + 3) / 4;
assert(numCharacters != 0)(static_cast <bool> (numCharacters != 0) ? void (0) : __assert_fail
 ("numCharacters != 0", "clang/lib/AST/ItaniumMangle.cpp", 1160
, __extension__ __PRETTY_FUNCTION__));

// Allocate a buffer of the right number of characters.
SmallVector<char, 20> buffer(numCharacters);

// Fill the buffer left-to-right.
for (unsigned stringIndex = 0; stringIndex != numCharacters; ++stringIndex) {
  // The bit-index of the next hex digit.
  unsigned digitBitIndex = 4 * (numCharacters - stringIndex - 1);

  // Project out 4 bits starting at 'digitIndex'.
  uint64_t hexDigit = valueBits.getRawData()[digitBitIndex / 64];
  hexDigit >>= (digitBitIndex % 64);
  hexDigit &= 0xF;

  // Map that over to a lowercase hex digit.
  static const char charForHex[16] = {
    '0', '1', '2', '3', '4', '5', '6', '7',
    '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
  };
  buffer[stringIndex] = charForHex[hexDigit];
}

Out.write(buffer.data(), numCharacters);
1184}

1186void CXXNameMangler::mangleFloatLiteral(QualType T, const llvm::APFloat &V) {
Out << 'L';
mangleType(T);
mangleFloat(V);
Out << 'E';
1191}

1193void CXXNameMangler::mangleFixedPointLiteral() {
DiagnosticsEngine &Diags = Context.getDiags();
unsigned DiagID = Diags.getCustomDiagID(
    DiagnosticsEngine::Error, "cannot mangle fixed point literals yet");
Diags.Report(DiagID);
1198}

1200void CXXNameMangler::mangleNullPointer(QualType T) {
//  <expr-primary> ::= L <type> 0 E
Out << 'L';
mangleType(T);
Out << "0E";
1205}

1207void CXXNameMangler::mangleNumber(const llvm::APSInt &Value) {
if (Value.isSigned() && Value.isNegative()) {
  Out << 'n';
  Value.abs().print(Out, /*signed*/ false);
} else {
  Value.print(Out, /*signed*/ false);
}
1214}

1216void CXXNameMangler::mangleNumber(int64_t Number) {
//  <number> ::= [n] <non-negative decimal integer>
if (Number < 0) {
  Out << 'n';
  Number = -Number;
}

Out << Number;
1224}

1226void CXXNameMangler::mangleCallOffset(int64_t NonVirtual, int64_t Virtual) {
//  <call-offset>  ::= h <nv-offset> _
//                 ::= v <v-offset> _
//  <nv-offset>    ::= <offset number>        # non-virtual base override
//  <v-offset>     ::= <offset number> _ <virtual offset number>
//                      # virtual base override, with vcall offset
if (!Virtual) {
  Out << 'h';
  mangleNumber(NonVirtual);
  Out << '_';
  return;
}

Out << 'v';
mangleNumber(NonVirtual);
Out << '_';
mangleNumber(Virtual);
Out << '_';
1244}

1246void CXXNameMangler::manglePrefix(QualType type) {
if (const auto *TST = type->getAs<TemplateSpecializationType>()) {
  if (!mangleSubstitution(QualType(TST, 0))) {
    mangleTemplatePrefix(TST->getTemplateName());

    // FIXME: GCC does not appear to mangle the template arguments when
    // the template in question is a dependent template name. Should we
    // emulate that badness?
    mangleTemplateArgs(TST->getTemplateName(), TST->template_arguments());
    addSubstitution(QualType(TST, 0));
  }
} else if (const auto *DTST =
               type->getAs<DependentTemplateSpecializationType>()) {
  if (!mangleSubstitution(QualType(DTST, 0))) {
    TemplateName Template = getASTContext().getDependentTemplateName(
        DTST->getQualifier(), DTST->getIdentifier());
    mangleTemplatePrefix(Template);

    // FIXME: GCC does not appear to mangle the template arguments when
    // the template in question is a dependent template name. Should we
    // emulate that badness?
    mangleTemplateArgs(Template, DTST->template_arguments());
    addSubstitution(QualType(DTST, 0));
  }
} else {
  // We use the QualType mangle type variant here because it handles
  // substitutions.
  mangleType(type);
}
1275}

1277/// Mangle everything prior to the base-unresolved-name in an unresolved-name.
1278///
1279/// \param recursive - true if this is being called recursively,
1280///   i.e. if there is more prefix "to the right".
1281void CXXNameMangler::mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
                                          bool recursive) {

// x, ::x
// <unresolved-name> ::= [gs] <base-unresolved-name>

// T::x / decltype(p)::x
// <unresolved-name> ::= sr <unresolved-type> <base-unresolved-name>

// T::N::x /decltype(p)::N::x
// <unresolved-name> ::= srN <unresolved-type> <unresolved-qualifier-level>+ E
//                       <base-unresolved-name>

// A::x, N::y, A<T>::z; "gs" means leading "::"
// <unresolved-name> ::= [gs] sr <unresolved-qualifier-level>+ E
//                       <base-unresolved-name>

switch (qualifier->getKind()) {
case NestedNameSpecifier::Global:
  Out << "gs";

  // We want an 'sr' unless this is the entire NNS.
  if (recursive)
    Out << "sr";

  // We never want an 'E' here.
  return;

case NestedNameSpecifier::Super:
  llvm_unreachable("Can't mangle __super specifier")::llvm::llvm_unreachable_internal("Can't mangle __super specifier"
, "clang/lib/AST/ItaniumMangle.cpp", 1310);

case NestedNameSpecifier::Namespace:
  if (qualifier->getPrefix())
    mangleUnresolvedPrefix(qualifier->getPrefix(),
                           /*recursive*/ true);
  else
    Out << "sr";
  mangleSourceNameWithAbiTags(qualifier->getAsNamespace());
  break;
case NestedNameSpecifier::NamespaceAlias:
  if (qualifier->getPrefix())
    mangleUnresolvedPrefix(qualifier->getPrefix(),
                           /*recursive*/ true);
  else
    Out << "sr";
  mangleSourceNameWithAbiTags(qualifier->getAsNamespaceAlias());
  break;

case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate: {
  const Type *type = qualifier->getAsType();

  // We only want to use an unresolved-type encoding if this is one of:
  //   - a decltype
  //   - a template type parameter
  //   - a template template parameter with arguments
  // In all of these cases, we should have no prefix.
  if (qualifier->getPrefix()) {
    mangleUnresolvedPrefix(qualifier->getPrefix(),
                           /*recursive*/ true);
  } else {
    // Otherwise, all the cases want this.
    Out << "sr";
  }

  if (mangleUnresolvedTypeOrSimpleId(QualType(type, 0), recursive ? "N" : ""))
    return;

  break;
}

case NestedNameSpecifier::Identifier:
  // Member expressions can have these without prefixes.
  if (qualifier->getPrefix())
    mangleUnresolvedPrefix(qualifier->getPrefix(),
                           /*recursive*/ true);
  else
    Out << "sr";

  mangleSourceName(qualifier->getAsIdentifier());
  // An Identifier has no type information, so we can't emit abi tags for it.
  break;
}

// If this was the innermost part of the NNS, and we fell out to
// here, append an 'E'.
if (!recursive)
  Out << 'E';
1369}

1371/// Mangle an unresolved-name, which is generally used for names which
1372/// weren't resolved to specific entities.
1373void CXXNameMangler::mangleUnresolvedName(
  NestedNameSpecifier *qualifier, DeclarationName name,
  const TemplateArgumentLoc *TemplateArgs, unsigned NumTemplateArgs,
  unsigned knownArity) {
if (qualifier) mangleUnresolvedPrefix(qualifier);
switch (name.getNameKind()) {
  // <base-unresolved-name> ::= <simple-id>
  case DeclarationName::Identifier:
    mangleSourceName(name.getAsIdentifierInfo());
    break;
  // <base-unresolved-name> ::= dn <destructor-name>
  case DeclarationName::CXXDestructorName:
    Out << "dn";
    mangleUnresolvedTypeOrSimpleId(name.getCXXNameType());
    break;
  // <base-unresolved-name> ::= on <operator-name>
  case DeclarationName::CXXConversionFunctionName:
  case DeclarationName::CXXLiteralOperatorName:
  case DeclarationName::CXXOperatorName:
    Out << "on";
    mangleOperatorName(name, knownArity);
    break;
  case DeclarationName::CXXConstructorName:
    llvm_unreachable("Can't mangle a constructor name!")::llvm::llvm_unreachable_internal("Can't mangle a constructor name!"
, "clang/lib/AST/ItaniumMangle.cpp", 1396);
  case DeclarationName::CXXUsingDirective:
    llvm_unreachable("Can't mangle a using directive name!")::llvm::llvm_unreachable_internal("Can't mangle a using directive name!"
, "clang/lib/AST/ItaniumMangle.cpp", 1398);
  case DeclarationName::CXXDeductionGuideName:
    llvm_unreachable("Can't mangle a deduction guide name!")::llvm::llvm_unreachable_internal("Can't mangle a deduction guide name!"
, "clang/lib/AST/ItaniumMangle.cpp", 1400);
  case DeclarationName::ObjCMultiArgSelector:
  case DeclarationName::ObjCOneArgSelector:
  case DeclarationName::ObjCZeroArgSelector:
    llvm_unreachable("Can't mangle Objective-C selector names here!")::llvm::llvm_unreachable_internal("Can't mangle Objective-C selector names here!"
, "clang/lib/AST/ItaniumMangle.cpp", 1404);
}

// The <simple-id> and on <operator-name> productions end in an optional
// <template-args>.
if (TemplateArgs)
  mangleTemplateArgs(TemplateName(), TemplateArgs, NumTemplateArgs);
1411}

1413void CXXNameMangler::mangleUnqualifiedName(
  GlobalDecl GD, DeclarationName Name, const DeclContext *DC,
  unsigned KnownArity, const AbiTagList *AdditionalAbiTags) {
const NamedDecl *ND = cast_or_null<NamedDecl>(GD.getDecl());
//  <unqualified-name> ::= [<module-name>] <operator-name>
//                     ::= <ctor-dtor-name>
//                     ::= [<module-name>] <source-name>
//                     ::= [<module-name>] DC <source-name>* E

if (ND && DC && DC->isFileContext())
  mangleModuleName(ND);

unsigned Arity = KnownArity;
switch (Name.getNameKind()) {
case DeclarationName::Identifier: {
  const IdentifierInfo *II = Name.getAsIdentifierInfo();

  // We mangle decomposition declarations as the names of their bindings.
  if (auto *DD = dyn_cast<DecompositionDecl>(ND)) {
    // FIXME: Non-standard mangling for decomposition declarations:
    //
    //  <unqualified-name> ::= DC <source-name>* E
    //
    // Proposed on cxx-abi-dev on 2016-08-12
    Out << "DC";
    for (auto *BD : DD->bindings())
      mangleSourceName(BD->getDeclName().getAsIdentifierInfo());
    Out << 'E';
    writeAbiTags(ND, AdditionalAbiTags);
    break;
  }

  if (auto *GD = dyn_cast<MSGuidDecl>(ND)) {
    // We follow MSVC in mangling GUID declarations as if they were variables
    // with a particular reserved name. Continue the pretense here.
    SmallString<sizeof("_GUID_12345678_1234_1234_1234_1234567890ab")> GUID;
    llvm::raw_svector_ostream GUIDOS(GUID);
    Context.mangleMSGuidDecl(GD, GUIDOS);
    Out << GUID.size() << GUID;
    break;
  }

  if (auto *TPO = dyn_cast<TemplateParamObjectDecl>(ND)) {
    // Proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/63.
    Out << "TA";
    mangleValueInTemplateArg(TPO->getType().getUnqualifiedType(),
                             TPO->getValue(), /*TopLevel=*/true);
    break;
  }

  if (II) {
    // Match GCC's naming convention for internal linkage symbols, for
    // symbols that are not actually visible outside of this TU. GCC
    // distinguishes between internal and external linkage symbols in
    // its mangling, to support cases like this that were valid C++ prior
    // to DR426:
    //
    //   void test() { extern void foo(); }
    //   static void foo();
    //
    // Don't bother with the L marker for names in anonymous namespaces; the
    // 12_GLOBAL__N_1 mangling is quite sufficient there, and this better
    // matches GCC anyway, because GCC does not treat anonymous namespaces as
    // implying internal linkage.
    if (Context.isInternalLinkageDecl(ND))
      Out << 'L';

    auto *FD = dyn_cast<FunctionDecl>(ND);
    bool IsRegCall = FD &&
                     FD->getType()->castAs<FunctionType>()->getCallConv() ==
                         clang::CC_X86RegCall;
    bool IsDeviceStub =
        FD && FD->hasAttr<CUDAGlobalAttr>() &&
        GD.getKernelReferenceKind() == KernelReferenceKind::Stub;
    if (IsDeviceStub)
      mangleDeviceStubName(II);
    else if (IsRegCall)
      mangleRegCallName(II);
    else
      mangleSourceName(II);

    writeAbiTags(ND, AdditionalAbiTags);
    break;
  }

  // Otherwise, an anonymous entity.  We must have a declaration.
  assert(ND && "mangling empty name without declaration")(static_cast <bool> (ND && "mangling empty name without declaration"
) ? void (0) : __assert_fail ("ND && \"mangling empty name without declaration\""
, "clang/lib/AST/ItaniumMangle.cpp", 1499, __extension__ __PRETTY_FUNCTION__
));

  if (const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(ND)) {
    if (NS->isAnonymousNamespace()) {
      // This is how gcc mangles these names.
      Out << "12_GLOBAL__N_1";
      break;
    }
  }

  if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
    // We must have an anonymous union or struct declaration.
    const RecordDecl *RD = VD->getType()->castAs<RecordType>()->getDecl();

    // Itanium C++ ABI 5.1.2:
    //
    //   For the purposes of mangling, the name of an anonymous union is
    //   considered to be the name of the first named data member found by a
    //   pre-order, depth-first, declaration-order walk of the data members of
    //   the anonymous union. If there is no such data member (i.e., if all of
    //   the data members in the union are unnamed), then there is no way for
    //   a program to refer to the anonymous union, and there is therefore no
    //   need to mangle its name.
    assert(RD->isAnonymousStructOrUnion()(static_cast <bool> (RD->isAnonymousStructOrUnion() &&
 "Expected anonymous struct or union!") ? void (0) : __assert_fail
 ("RD->isAnonymousStructOrUnion() && \"Expected anonymous struct or union!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1523, __extension__ __PRETTY_FUNCTION__
))
           && "Expected anonymous struct or union!")(static_cast <bool> (RD->isAnonymousStructOrUnion() &&
 "Expected anonymous struct or union!") ? void (0) : __assert_fail
 ("RD->isAnonymousStructOrUnion() && \"Expected anonymous struct or union!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1523, __extension__ __PRETTY_FUNCTION__
));
    const FieldDecl *FD = RD->findFirstNamedDataMember();

    // It's actually possible for various reasons for us to get here
    // with an empty anonymous struct / union.  Fortunately, it
    // doesn't really matter what name we generate.
    if (!FD) break;
    assert(FD->getIdentifier() && "Data member name isn't an identifier!")(static_cast <bool> (FD->getIdentifier() && "Data member name isn't an identifier!"
) ? void (0) : __assert_fail ("FD->getIdentifier() && \"Data member name isn't an identifier!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1530, __extension__ __PRETTY_FUNCTION__
));

    mangleSourceName(FD->getIdentifier());
    // Not emitting abi tags: internal name anyway.
    break;
  }

  // Class extensions have no name as a category, and it's possible
  // for them to be the semantic parent of certain declarations
  // (primarily, tag decls defined within declarations).  Such
  // declarations will always have internal linkage, so the name
  // doesn't really matter, but we shouldn't crash on them.  For
  // safety, just handle all ObjC containers here.
  if (isa<ObjCContainerDecl>(ND))
    break;

  // We must have an anonymous struct.
  const TagDecl *TD = cast<TagDecl>(ND);
  if (const TypedefNameDecl *D = TD->getTypedefNameForAnonDecl()) {
    assert(TD->getDeclContext() == D->getDeclContext() &&(static_cast <bool> (TD->getDeclContext() == D->getDeclContext
() && "Typedef should not be in another decl context!"
) ? void (0) : __assert_fail ("TD->getDeclContext() == D->getDeclContext() && \"Typedef should not be in another decl context!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1550, __extension__ __PRETTY_FUNCTION__
))
           "Typedef should not be in another decl context!")(static_cast <bool> (TD->getDeclContext() == D->getDeclContext
() && "Typedef should not be in another decl context!"
) ? void (0) : __assert_fail ("TD->getDeclContext() == D->getDeclContext() && \"Typedef should not be in another decl context!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1550, __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!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1552, __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!\""
, "clang/lib/AST/ItaniumMangle.cpp", 1552, __extension__ __PRETTY_FUNCTION__
));
    mangleSourceName(D->getDeclName().getAsIdentifierInfo());
    assert(!AdditionalAbiTags && "Type cannot have additional abi tags")(static_cast <bool> (!AdditionalAbiTags && "Type cannot have additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"Type cannot have additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1554, __extension__ __PRETTY_FUNCTION__
));
    // Explicit abi tags are still possible; take from underlying type, not
    // from typedef.
    writeAbiTags(TD, nullptr);
    break;
  }

  // <unnamed-type-name> ::= <closure-type-name>
  //
  // <closure-type-name> ::= Ul <lambda-sig> E [ <nonnegative number> ] _
  // <lambda-sig> ::= <template-param-decl>* <parameter-type>+
  //     # Parameter types or 'v' for 'void'.
  if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(TD)) {
    std::optional<unsigned> DeviceNumber =
        Context.getDiscriminatorOverride()(Context.getASTContext(), Record);

    // If we have a device-number via the discriminator, use that to mangle
    // the lambda, otherwise use the typical lambda-mangling-number. In either
    // case, a '0' should be mangled as a normal unnamed class instead of as a
    // lambda.
    if (Record->isLambda() &&
        ((DeviceNumber && *DeviceNumber > 0) ||
         (!DeviceNumber && Record->getLambdaManglingNumber() > 0))) {
      assert(!AdditionalAbiTags &&(static_cast <bool> (!AdditionalAbiTags && "Lambda type cannot have additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"Lambda type cannot have additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1578, __extension__ __PRETTY_FUNCTION__
))
             "Lambda type cannot have additional abi tags")(static_cast <bool> (!AdditionalAbiTags && "Lambda type cannot have additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"Lambda type cannot have additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1578, __extension__ __PRETTY_FUNCTION__
));
      mangleLambda(Record);
      break;
    }
  }

  if (TD->isExternallyVisible()) {
    unsigned UnnamedMangle =
        getASTContext().getManglingNumber(TD, Context.isAux());
    Out << "Ut";
    if (UnnamedMangle > 1)
      Out << UnnamedMangle - 2;
    Out << '_';
    writeAbiTags(TD, AdditionalAbiTags);
    break;
  }

  // Get a unique id for the anonymous struct. If it is not a real output
  // ID doesn't matter so use fake one.
  unsigned AnonStructId =
      NullOut ? 0
              : Context.getAnonymousStructId(TD, dyn_cast<FunctionDecl>(DC));

  // Mangle it as a source name in the form
  // [n] $_<id>
  // where n is the length of the string.
  SmallString<8> Str;
  Str += "$_";
  Str += llvm::utostr(AnonStructId);

  Out << Str.size();
  Out << Str;
  break;
}

case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
  llvm_unreachable("Can't mangle Objective-C selector names here!")::llvm::llvm_unreachable_internal("Can't mangle Objective-C selector names here!"
, "clang/lib/AST/ItaniumMangle.cpp", 1616);

case DeclarationName::CXXConstructorName: {
  const CXXRecordDecl *InheritedFrom = nullptr;
  TemplateName InheritedTemplateName;
  const TemplateArgumentList *InheritedTemplateArgs = nullptr;
  if (auto Inherited =
          cast<CXXConstructorDecl>(ND)->getInheritedConstructor()) {
    InheritedFrom = Inherited.getConstructor()->getParent();
    InheritedTemplateName =
        TemplateName(Inherited.getConstructor()->getPrimaryTemplate());
    InheritedTemplateArgs =
        Inherited.getConstructor()->getTemplateSpecializationArgs();
  }

  if (ND == Structor)
    // If the named decl is the C++ constructor we're mangling, use the type
    // we were given.
    mangleCXXCtorType(static_cast<CXXCtorType>(StructorType), InheritedFrom);
  else
    // Otherwise, use the complete constructor name. This is relevant if a
    // class with a constructor is declared within a constructor.
    mangleCXXCtorType(Ctor_Complete, InheritedFrom);

  // FIXME: The template arguments are part of the enclosing prefix or
  // nested-name, but it's more convenient to mangle them here.
  if (InheritedTemplateArgs)
    mangleTemplateArgs(InheritedTemplateName, *InheritedTemplateArgs);

  writeAbiTags(ND, AdditionalAbiTags);
  break;
}

case DeclarationName::CXXDestructorName:
  if (ND == Structor)
    // If the named decl is the C++ destructor we're mangling, use the type we
    // were given.
    mangleCXXDtorType(static_cast<CXXDtorType>(StructorType));
  else
    // Otherwise, use the complete destructor name. This is relevant if a
    // class with a destructor is declared within a destructor.
    mangleCXXDtorType(Dtor_Complete);
  writeAbiTags(ND, AdditionalAbiTags);
  break;

case DeclarationName::CXXOperatorName:
  if (ND && Arity == UnknownArity) {
    Arity = cast<FunctionDecl>(ND)->getNumParams();

    // If we have a member function, we need to include the 'this' pointer.
    if (const auto *MD = dyn_cast<CXXMethodDecl>(ND))
      if (!MD->isStatic())
        Arity++;
  }
  [[fallthrough]];
case DeclarationName::CXXConversionFunctionName:
case DeclarationName::CXXLiteralOperatorName:
  mangleOperatorName(Name, Arity);
  writeAbiTags(ND, AdditionalAbiTags);
  break;

case DeclarationName::CXXDeductionGuideName:
  llvm_unreachable("Can't mangle a deduction guide name!")::llvm::llvm_unreachable_internal("Can't mangle a deduction guide name!"
, "clang/lib/AST/ItaniumMangle.cpp", 1678);

case DeclarationName::CXXUsingDirective:
  llvm_unreachable("Can't mangle a using directive name!")::llvm::llvm_unreachable_internal("Can't mangle a using directive name!"
, "clang/lib/AST/ItaniumMangle.cpp", 1681);
}
1683}

1685void CXXNameMangler::mangleRegCallName(const IdentifierInfo *II) {
// <source-name> ::= <positive length number> __regcall3__ <identifier>
// <number> ::= [n] <non-negative decimal integer>
// <identifier> ::= <unqualified source code identifier>
Out << II->getLength() + sizeof("__regcall3__") - 1 << "__regcall3__"
    << II->getName();
1691}

1693void CXXNameMangler::mangleDeviceStubName(const IdentifierInfo *II) {
// <source-name> ::= <positive length number> __device_stub__ <identifier>
// <number> ::= [n] <non-negative decimal integer>
// <identifier> ::= <unqualified source code identifier>
Out << II->getLength() + sizeof("__device_stub__") - 1 << "__device_stub__"
    << II->getName();
1699}

1701void CXXNameMangler::mangleSourceName(const IdentifierInfo *II) {
// <source-name> ::= <positive length number> <identifier>
// <number> ::= [n] <non-negative decimal integer>
// <identifier> ::= <unqualified source code identifier>
Out << II->getLength() << II->getName();
1706}

1708void CXXNameMangler::mangleNestedName(GlobalDecl GD,
                                    const DeclContext *DC,
                                    const AbiTagList *AdditionalAbiTags,
                                    bool NoFunction) {
const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
// <nested-name>
//   ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E
//   ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix>
//       <template-args> E

Out << 'N';
if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(ND)) {
  Qualifiers MethodQuals = Method->getMethodQualifiers();
  // We do not consider restrict a distinguishing attribute for overloading
  // purposes so we must not mangle it.
  MethodQuals.removeRestrict();
  mangleQualifiers(MethodQuals);
  mangleRefQualifier(Method->getRefQualifier());
}

// Check if we have a template.
const TemplateArgumentList *TemplateArgs = nullptr;
if (GlobalDecl TD = isTemplate(GD, TemplateArgs)) {
  mangleTemplatePrefix(TD, NoFunction);
  mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
} else {
  manglePrefix(DC, NoFunction);
  mangleUnqualifiedName(GD, DC, AdditionalAbiTags);
}

Out << 'E';
1739}
1740void CXXNameMangler::mangleNestedName(const TemplateDecl *TD,
                                    ArrayRef<TemplateArgument> Args) {
// <nested-name> ::= N [<CV-qualifiers>] <template-prefix> <template-args> E

Out << 'N';

mangleTemplatePrefix(TD);
mangleTemplateArgs(asTemplateName(TD), Args);

Out << 'E';
1750}

1752void CXXNameMangler::mangleNestedNameWithClosurePrefix(
  GlobalDecl GD, const NamedDecl *PrefixND,
  const AbiTagList *AdditionalAbiTags) {
// A <closure-prefix> represents a variable or field, not a regular
// DeclContext, so needs special handling. In this case we're mangling a
// limited form of <nested-name>:
//
// <nested-name> ::= N <closure-prefix> <closure-type-name> E

Out << 'N';

mangleClosurePrefix(PrefixND);
mangleUnqualifiedName(GD, nullptr, AdditionalAbiTags);

Out << 'E';
1767}

1769static GlobalDecl getParentOfLocalEntity(const DeclContext *DC) {
GlobalDecl GD;
// The Itanium spec says:
// For entities in constructors and destructors, the mangling of the
// complete object constructor or destructor is used as the base function
// name, i.e. the C1 or D1 version.
if (auto *CD = dyn_cast<CXXConstructorDecl>(DC))
  GD = GlobalDecl(CD, Ctor_Complete);
else if (auto *DD = dyn_cast<CXXDestructorDecl>(DC))
  GD = GlobalDecl(DD, Dtor_Complete);
else
  GD = GlobalDecl(cast<FunctionDecl>(DC));
return GD;
1782}

1784void CXXNameMangler::mangleLocalName(GlobalDecl GD,
                                   const AbiTagList *AdditionalAbiTags) {
const Decl *D = GD.getDecl();
// <local-name> := Z <function encoding> E <entity name> [<discriminator>]
//              := Z <function encoding> E s [<discriminator>]
// <local-name> := Z <function encoding> E d [ <parameter number> ]
//                 _ <entity name>
// <discriminator> := _ <non-negative number>
assert(isa<NamedDecl>(D) || isa<BlockDecl>(D))(static_cast <bool> (isa<NamedDecl>(D) || isa<
BlockDecl>(D)) ? void (0) : __assert_fail ("isa<NamedDecl>(D) || isa<BlockDecl>(D)"
, "clang/lib/AST/ItaniumMangle.cpp", 1792, __extension__ __PRETTY_FUNCTION__
));
const RecordDecl *RD = GetLocalClassDecl(D);
const DeclContext *DC = Context.getEffectiveDeclContext(RD ? RD : D);

Out << 'Z';

{
  AbiTagState LocalAbiTags(AbiTags);

  if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(DC))
    mangleObjCMethodName(MD);
  else if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC))
    mangleBlockForPrefix(BD);
  else
    mangleFunctionEncoding(getParentOfLocalEntity(DC));

  // Implicit ABI tags (from namespace) are not available in the following
  // entity; reset to actually emitted tags, which are available.
  LocalAbiTags.setUsedAbiTags(LocalAbiTags.getEmittedAbiTags());
}

Out << 'E';

// GCC 5.3.0 doesn't emit derived ABI tags for local names but that seems to
// be a bug that is fixed in trunk.

if (RD) {
  // The parameter number is omitted for the last parameter, 0 for the
  // second-to-last parameter, 1 for the third-to-last parameter, etc. The
  // <entity name> will of course contain a <closure-type-name>: Its
  // numbering will be local to the particular argument in which it appears
  // -- other default arguments do not affect its encoding.
  const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD);
  if (CXXRD && CXXRD->isLambda()) {
    if (const ParmVarDecl *Parm
            = dyn_cast_or_null<ParmVarDecl>(CXXRD->getLambdaContextDecl())) {
      if (const FunctionDecl *Func
            = dyn_cast<FunctionDecl>(Parm->getDeclContext())) {
        Out << 'd';
        unsigned Num = Func->getNumParams() - Parm->getFunctionScopeIndex();
        if (Num > 1)
          mangleNumber(Num - 2);
        Out << '_';
      }
    }
  }

  // Mangle the name relative to the closest enclosing function.
  // equality ok because RD derived from ND above
  if (D == RD)  {
    mangleUnqualifiedName(RD, DC, AdditionalAbiTags);
  } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
    if (const NamedDecl *PrefixND = getClosurePrefix(BD))
      mangleClosurePrefix(PrefixND, true /*NoFunction*/);
    else
      manglePrefix(Context.getEffectiveDeclContext(BD), true /*NoFunction*/);
    assert(!AdditionalAbiTags && "Block cannot have additional abi tags")(static_cast <bool> (!AdditionalAbiTags && "Block cannot have additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"Block cannot have additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1848, __extension__ __PRETTY_FUNCTION__
));
    mangleUnqualifiedBlock(BD);
  } else {
    const NamedDecl *ND = cast<NamedDecl>(D);
    mangleNestedName(GD, Context.getEffectiveDeclContext(ND),
                     AdditionalAbiTags, true /*NoFunction*/);
  }
} else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
  // Mangle a block in a default parameter; see above explanation for
  // lambdas.
  if (const ParmVarDecl *Parm
          = dyn_cast_or_null<ParmVarDecl>(BD->getBlockManglingContextDecl())) {
    if (const FunctionDecl *Func
          = dyn_cast<FunctionDecl>(Parm->getDeclContext())) {
      Out << 'd';
      unsigned Num = Func->getNumParams() - Parm->getFunctionScopeIndex();
      if (Num > 1)
        mangleNumber(Num - 2);
      Out << '_';
    }
  }

  assert(!AdditionalAbiTags && "Block cannot have additional abi tags")(static_cast <bool> (!AdditionalAbiTags && "Block cannot have additional abi tags"
) ? void (0) : __assert_fail ("!AdditionalAbiTags && \"Block cannot have additional abi tags\""
, "clang/lib/AST/ItaniumMangle.cpp", 1870, __extension__ __PRETTY_FUNCTION__
));
  mangleUnqualifiedBlock(BD);
} else {
  mangleUnqualifiedName(GD, DC, AdditionalAbiTags);
}

if (const NamedDecl *ND = dyn_cast<NamedDecl>(RD ? RD : D)) {
  unsigned disc;
  if (Context.getNextDiscriminator(ND, disc)) {
    if (disc < 10)
      Out << '_' << disc;
    else
      Out << "__" << disc << '_';
  }
}
1885}

1887void CXXNameMangler::mangleBlockForPrefix(const BlockDecl *Block) {
if (GetLocalClassDecl(Block)) {
  mangleLocalName(Block, /* AdditionalAbiTags */ nullptr);
  return;
}
const DeclContext *DC = Context.getEffectiveDeclContext(Block);
if (isLocalContainerContext(DC)) {
  mangleLocalName(Block, /* AdditionalAbiTags */ nullptr);
  return;
}
if (const NamedDecl *PrefixND = getClosurePrefix(Block))
  mangleClosurePrefix(PrefixND);
else
  manglePrefix(DC);
mangleUnqualifiedBlock(Block);
1902}

1904void CXXNameMangler::mangleUnqualifiedBlock(const BlockDecl *Block) {
// When trying to be ABI-compatibility with clang 12 and before, mangle a
// <data-member-prefix> now, with no substitutions and no <template-args>.
if (Decl *Context = Block->getBlockManglingContextDecl()) {
  if (getASTContext().getLangOpts().getClangABICompat() <=
          LangOptions::ClangABI::Ver12 &&
      (isa<VarDecl>(Context) || isa<FieldDecl>(Context)) &&
      Context->getDeclContext()->isRecord()) {
    const auto *ND = cast<NamedDecl>(Context);
    if (ND->getIdentifier()) {
      mangleSourceNameWithAbiTags(ND);
      Out << 'M';
    }
  }
}

// If we have a block mangling number, use it.
unsigned Number = Block->getBlockManglingNumber();
// Otherwise, just make up a number. It doesn't matter what it is because
// the symbol in question isn't externally visible.
if (!Number)
  Number = Context.getBlockId(Block, false);
else {
  // Stored mangling numbers are 1-based.
  --Number;
}
Out << "Ub";
if (Number > 0)
  Out << Number - 1;
Out << '_';
1934}

1936// <template-param-decl>
1937//   ::= Ty                              # template type parameter
1938//   ::= Tn <type>                       # template non-type parameter
1939//   ::= Tt <template-param-decl>* E     # template template parameter
1940//   ::= Tp <template-param-decl>        # template parameter pack
1941void CXXNameMangler::mangleTemplateParamDecl(const NamedDecl *Decl) {
if (auto *Ty = dyn_cast<TemplateTypeParmDecl>(Decl)) {
  if (Ty->isParameterPack())
    Out << "Tp";
  Out << "Ty";
} else if (auto *Tn = dyn_cast<NonTypeTemplateParmDecl>(Decl)) {
  if (Tn->isExpandedParameterPack()) {
    for (unsigned I = 0, N = Tn->getNumExpansionTypes(); I != N; ++I) {
      Out << "Tn";
      mangleType(Tn->getExpansionType(I));
    }
  } else {
    QualType T = Tn->getType();
    if (Tn->isParameterPack()) {
      Out << "Tp";
      if (auto *PackExpansion = T->getAs<PackExpansionType>())
        T = PackExpansion->getPattern();
    }
    Out << "Tn";
    mangleType(T);
  }
} else if (auto *Tt = dyn_cast<TemplateTemplateParmDecl>(Decl)) {
  if (Tt->isExpandedParameterPack()) {
    for (unsigned I = 0, N = Tt->getNumExpansionTemplateParameters(); I != N;
         ++I) {
      Out << "Tt";
      for (auto *Param : *Tt->getExpansionTemplateParameters(I))
        mangleTemplateParamDecl(Param);
      Out << "E";
    }
  } else {
    if (Tt->isParameterPack())
      Out << "Tp";
    Out << "Tt";
    for (auto *Param : *Tt->getTemplateParameters())
      mangleTemplateParamDecl(Param);
    Out << "E";
  }
}
1980}

1982void CXXNameMangler::mangleLambda(const CXXRecordDecl *Lambda) {
// When trying to be ABI-compatibility with clang 12 and before, mangle a
// <data-member-prefix> now, with no substitutions.
if (Decl *Context = Lambda->getLambdaContextDecl()) {
  if (getASTContext().getLangOpts().getClangABICompat() <=
          LangOptions::ClangABI::Ver12 &&
      (isa<VarDecl>(Context) || isa<FieldDecl>(Context)) &&
      !isa<ParmVarDecl>(Context)) {
    if (const IdentifierInfo *Name
          = cast<NamedDecl>(Context)->getIdentifier()) {
      mangleSourceName(Name);
      const TemplateArgumentList *TemplateArgs = nullptr;
      if (GlobalDecl TD = isTemplate(cast<NamedDecl>(Context), TemplateArgs))
        mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
      Out << 'M';
    }
  }
}

Out << "Ul";
mangleLambdaSig(Lambda);
Out << "E";

// The number is omitted for the first closure type with a given
// <lambda-sig> in a given context; it is n-2 for the nth closure type
// (in lexical order) with that same <lambda-sig> and context.
//
// The AST keeps track of the number for us.
//
// In CUDA/HIP, to ensure the consistent lamba numbering between the device-
// and host-side compilations, an extra device mangle context may be created
// if the host-side CXX ABI has different numbering for lambda. In such case,
// if the mangle context is that device-side one, use the device-side lambda
// mangling number for this lambda.
std::optional<unsigned> DeviceNumber =
    Context.getDiscriminatorOverride()(Context.getASTContext(), Lambda);
unsigned Number =
    DeviceNumber ? *DeviceNumber : Lambda->getLambdaManglingNumber();

assert(Number > 0 && "Lambda should be mangled as an unnamed class")(static_cast <bool> (Number > 0 && "Lambda should be mangled as an unnamed class"
) ? void (0) : __assert_fail ("Number > 0 && \"Lambda should be mangled as an unnamed class\""
, "clang/lib/AST/ItaniumMangle.cpp", 2021, __extension__ __PRETTY_FUNCTION__
));
if (Number > 1)
  mangleNumber(Number - 2);
Out << '_';
2025}

2027void CXXNameMangler::mangleLambdaSig(const CXXRecordDecl *Lambda) {
for (auto *D : Lambda->getLambdaExplicitTemplateParameters())
  mangleTemplateParamDecl(D);
auto *Proto =
    Lambda->getLambdaTypeInfo()->getType()->castAs<FunctionProtoType>();
mangleBareFunctionType(Proto, /*MangleReturnType=*/false,
                       Lambda->getLambdaStaticInvoker());
2034}

2036void CXXNameMangler::manglePrefix(NestedNameSpecifier *qualifier) {
switch (qualifier->getKind()) {
case NestedNameSpecifier::Global:
  // nothing
  return;

case NestedNameSpecifier::Super:
  llvm_unreachable("Can't mangle __super specifier")::llvm::llvm_unreachable_internal("Can't mangle __super specifier"
, "clang/lib/AST/ItaniumMangle.cpp", 2043);

case NestedNameSpecifier::Namespace:
  mangleName(qualifier->getAsNamespace());
  return;

case NestedNameSpecifier::NamespaceAlias:
  mangleName(qualifier->getAsNamespaceAlias()->getNamespace());
  return;

case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
  manglePrefix(QualType(qualifier->getAsType(), 0));
  return;

case NestedNameSpecifier::Identifier:
  // Clang 14 and before did not consider this substitutable.
  bool Clang14Compat = getASTContext().getLangOpts().getClangABICompat() <=
                       LangOptions::ClangABI::Ver14;
  if (!Clang14Compat && mangleSubstitution(qualifier))
    return;

  // Member expressions can have these without prefixes, but that
  // should end up in mangleUnresolvedPrefix instead.
  assert(qualifier->getPrefix())(static_cast <bool> (qualifier->getPrefix()) ? void (
0) : __assert_fail ("qualifier->getPrefix()", "clang/lib/AST/ItaniumMangle.cpp"
, 2067, __extension__ __PRETTY_FUNCTION__));
  manglePrefix(qualifier->getPrefix());

  mangleSourceName(qualifier->getAsIdentifier());

  if (!Clang14Compat)
    addSubstitution(qualifier);
  return;
}

llvm_unreachable("unexpected nested name specifier")::llvm::llvm_unreachable_internal("unexpected nested name specifier"
, "clang/lib/AST/ItaniumMangle.cpp", 2077);
2078}

2080void CXXNameMangler::manglePrefix(const DeclContext *DC, bool NoFunction) {
//  <prefix> ::= <prefix> <unqualified-name>
//           ::= <template-prefix> <template-args>
//           ::= <closure-prefix>
//           ::= <template-param>
//           ::= # empty
//           ::= <substitution>

assert(!isa<LinkageSpecDecl>(DC) && "prefix cannot be LinkageSpecDecl")(static_cast <bool> (!isa<LinkageSpecDecl>(DC) &&
 "prefix cannot be LinkageSpecDecl") ? void (0) : __assert_fail
 ("!isa<LinkageSpecDecl>(DC) && \"prefix cannot be LinkageSpecDecl\""
, "clang/lib/AST/ItaniumMangle.cpp", 2088, __extension__ __PRETTY_FUNCTION__
));

if (DC->isTranslationUnit())
  return;

if (NoFunction && isLocalContainerContext(DC))
  return;

assert(!isLocalContainerContext(DC))(static_cast <bool> (!isLocalContainerContext(DC)) ? void
 (0) : __assert_fail ("!isLocalContainerContext(DC)", "clang/lib/AST/ItaniumMangle.cpp"
, 2096, __extension__ __PRETTY_FUNCTION__));

const NamedDecl *ND = cast<NamedDecl>(DC);
if (mangleSubstitution(ND))
  return;

// Check if we have a template-prefix or a closure-prefix.
const TemplateArgumentList *TemplateArgs = nullptr;
if (GlobalDecl TD = isTemplate(ND, TemplateArgs)) {
  mangleTemplatePrefix(TD);
  mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
} else if (const NamedDecl *PrefixND = getClosurePrefix(ND)) {
  mangleClosurePrefix(PrefixND, NoFunction);
  mangleUnqualifiedName(ND, nullptr, nullptr);
} else {
  const DeclContext *DC = Context.getEffectiveDeclContext(ND);
  manglePrefix(DC, NoFunction);
  mangleUnqualifiedName(ND, DC, nullptr);
}

addSubstitution(ND);
2117}

2119void CXXNameMangler::mangleTemplatePrefix(TemplateName Template) {
// <template-prefix> ::= <prefix> <template unqualified-name>
//                   ::= <template-param>
//                   ::= <substitution>
if (TemplateDecl *TD = Template.getAsTemplateDecl())
  return mangleTemplatePrefix(TD);

DependentTemplateName *Dependent = Template.getAsDependentTemplateName();
assert(Dependent && "unexpected template name kind")(static_cast <bool> (Dependent && "unexpected template name kind"
) ? void (0) : __assert_fail ("Dependent && \"unexpected template name kind\""
, "clang/lib/AST/ItaniumMangle.cpp", 2127, __extension__ __PRETTY_FUNCTION__
));

// Clang 11 and before mangled the substitution for a dependent template name
// after already having emitted (a substitution for) the prefix.
bool Clang11Compat = getASTContext().getLangOpts().getClangABICompat() <=
                     LangOptions::ClangABI::Ver11;
if (!Clang11Compat && mangleSubstitution(Template))
  return;

if (NestedNameSpecifier *Qualifier = Dependent->getQualifier())
  manglePrefix(Qualifier);

if (Clang11Compat && mangleSubstitution(Template))
  return;

if (const IdentifierInfo *Id = Dependent->getIdentifier())
  mangleSourceName(Id);
else
  mangleOperatorName(Dependent->getOperator(), UnknownArity);

addSubstitution(Template);
2148}

2150void CXXNameMangler::mangleTemplatePrefix(GlobalDecl GD,
                                        bool NoFunction) {
const TemplateDecl *ND = cast<TemplateDecl>(GD.getDecl());
// <template-prefix> ::= <prefix> <template unqualified-name>
//                   ::= <template-param>
//                   ::= <substitution>
// <template-template-param> ::= <template-param>
//                               <substitution>

if (mangleSubstitution(ND))
  return;

// <template-template-param> ::= <template-param>
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) {
  mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
} else {
  const DeclContext *DC = Context.getEffectiveDeclContext(ND);
  manglePrefix(DC, NoFunction);
  if (isa<BuiltinTemplateDecl>(ND) || isa<ConceptDecl>(ND))
    mangleUnqualifiedName(GD, DC, nullptr);
  else
    mangleUnqualifiedName(GD.getWithDecl(ND->getTemplatedDecl()), DC,
                          nullptr);
}

addSubstitution(ND);
2176}

2178const NamedDecl *CXXNameMangler::getClosurePrefix(const Decl *ND) {
if (getASTContext().getLangOpts().getClangABICompat() <=
15
←
Assuming the condition is true→
16
←
Taking true branch→
    LangOptions::ClangABI::Ver12)
  return nullptr;
17
←
Returning null pointer, which participates in a condition later→

const NamedDecl *Context = nullptr;
if (auto *Block = dyn_cast<BlockDecl>(ND)) {
  Context = dyn_cast_or_null<NamedDecl>(Block->getBlockManglingContextDecl());
} else if (auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
  if (RD->isLambda())
    Context = dyn_cast_or_null<NamedDecl>(RD->getLambdaContextDecl());
}
if (!Context)
  return nullptr;

// Only lambdas within the initializer of a non-local variable or non-static
// data member get a <closure-prefix>.
if ((isa<VarDecl>(Context) && cast<VarDecl>(Context)->hasGlobalStorage()) ||
    isa<FieldDecl>(Context))
  return Context;

return nullptr;
2200}

2202void CXXNameMangler::mangleClosurePrefix(const NamedDecl *ND, bool NoFunction) {
//  <closure-prefix> ::= [ <prefix> ] <unqualified-name> M
//                   ::= <template-prefix> <template-args> M
if (mangleSubstitution(ND))
  return;

const TemplateArgumentList *TemplateArgs = nullptr;
if (GlobalDecl TD = isTemplate(ND, TemplateArgs)) {
  mangleTemplatePrefix(TD, NoFunction);
  mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
} else {
  const auto *DC = Context.getEffectiveDeclContext(ND);
  manglePrefix(DC, NoFunction);
  mangleUnqualifiedName(ND, DC, nullptr);
}

Out << 'M';

addSubstitution(ND);
2221}

2223/// Mangles a template name under the production <type>.  Required for
2224/// template template arguments.
2225///   <type> ::= <class-enum-type>
2226///          ::= <template-param>
2227///          ::= <substitution>
2228void CXXNameMangler::mangleType(TemplateName TN) {
if (mangleSubstitution(TN))
  return;

TemplateDecl *TD = nullptr;

switch (TN.getKind()) {
case TemplateName::QualifiedTemplate:
case TemplateName::UsingTemplate:
case TemplateName::Template:
  TD = TN.getAsTemplateDecl();
  goto HaveDecl;

HaveDecl:
  if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TD))
    mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
  else
    mangleName(TD);
  break;

case TemplateName::OverloadedTemplate:
case TemplateName::AssumedTemplate:
  llvm_unreachable("can't mangle an overloaded template name as a <type>")::llvm::llvm_unreachable_internal("can't mangle an overloaded template name as a <type>"
, "clang/lib/AST/ItaniumMangle.cpp", 2250);

case TemplateName::DependentTemplate: {
  const DependentTemplateName *Dependent = TN.getAsDependentTemplateName();
  assert(Dependent->isIdentifier())(static_cast <bool> (Dependent->isIdentifier()) ? void
 (0) : __assert_fail ("Dependent->isIdentifier()", "clang/lib/AST/ItaniumMangle.cpp"
, 2254, __extension__ __PRETTY_FUNCTION__));

  // <class-enum-type> ::= <name>
  // <name> ::= <nested-name>
  mangleUnresolvedPrefix(Dependent->getQualifier());
  mangleSourceName(Dependent->getIdentifier());
  break;
}

case TemplateName::SubstTemplateTemplateParm: {
  // Substituted template parameters are mangled as the substituted
  // template.  This will check for the substitution twice, which is
  // fine, but we have to return early so that we don't try to *add*
  // the substitution twice.
  SubstTemplateTemplateParmStorage *subst
    = TN.getAsSubstTemplateTemplateParm();
  mangleType(subst->getReplacement());
  return;
}

case TemplateName::SubstTemplateTemplateParmPack: {
  // FIXME: not clear how to mangle this!
  // template <template <class> class T...> class A {
  //   template <template <class> class U...> void foo(B<T,U> x...);
  // };
  Out << "_SUBSTPACK_";
  break;
}
}

addSubstitution(TN);
2285}

2287bool CXXNameMangler::mangleUnresolvedTypeOrSimpleId(QualType Ty,
                                                  StringRef Prefix) {
// Only certain other types are valid as prefixes;  enumerate them.
switch (Ty->getTypeClass()) {
case Type::Builtin:
case Type::Complex:
case Type::Adjusted:
case Type::Decayed:
case Type::Pointer:
case Type::BlockPointer:
case Type::LValueReference:
case Type::RValueReference:
case Type::MemberPointer:
case Type::ConstantArray:
case Type::IncompleteArray:
case Type::VariableArray:
case Type::DependentSizedArray:
case Type::DependentAddressSpace:
case Type::DependentVector:
case Type::DependentSizedExtVector:
case Type::Vector:
case Type::ExtVector:
case Type::ConstantMatrix:
case Type::DependentSizedMatrix:
case Type::FunctionProto:
case Type::FunctionNoProto:
case Type::Paren:
case Type::Attributed:
case Type::BTFTagAttributed:
case Type::Auto:
case Type::DeducedTemplateSpecialization:
case Type::PackExpansion:
case Type::ObjCObject:
case Type::ObjCInterface:
case Type::ObjCObjectPointer:
case Type::ObjCTypeParam:
case Type::Atomic:
case Type::Pipe:
case Type::MacroQualified:
case Type::BitInt:
case Type::DependentBitInt:
  llvm_unreachable("type is illegal as a nested name specifier")::llvm::llvm_unreachable_internal("type is illegal as a nested name specifier"
, "clang/lib/AST/ItaniumMangle.cpp", 2328);

case Type::SubstTemplateTypeParmPack:
  // FIXME: not clear how to mangle this!
  // template <class T...> class A {
  //   template <class U...> void foo(decltype(T::foo(U())) x...);
  // };
  Out << "_SUBSTPACK_";
  break;

// <unresolved-type> ::= <template-param>
//                   ::= <decltype>
//                   ::= <template-template-param> <template-args>
// (this last is not official yet)
case Type::TypeOfExpr:
case Type::TypeOf:
case Type::Decltype:
case Type::TemplateTypeParm:
case Type::UnaryTransform:
case Type::SubstTemplateTypeParm:
unresolvedType:
  // Some callers want a prefix before the mangled type.
  Out << Prefix;

  // This seems to do everything we want.  It's not really
  // sanctioned for a substituted template parameter, though.
  mangleType(Ty);

  // We never want to print 'E' directly after an unresolved-type,
  // so we return directly.
  return true;

case Type::Typedef:
  mangleSourceNameWithAbiTags(cast<TypedefType>(Ty)->getDecl());
  break;

case Type::UnresolvedUsing:
  mangleSourceNameWithAbiTags(
      cast<UnresolvedUsingType>(Ty)->getDecl());
  break;

case Type::Enum:
case Type::Record:
  mangleSourceNameWithAbiTags(cast<TagType>(Ty)->getDecl());
  break;

case Type::TemplateSpecialization: {
  const TemplateSpecializationType *TST =
      cast<TemplateSpecializationType>(Ty);
  TemplateName TN = TST->getTemplateName();
  switch (TN.getKind()) {
  case TemplateName::Template:
  case TemplateName::QualifiedTemplate: {
    TemplateDecl *TD = TN.getAsTemplateDecl();

    // If the base is a template template parameter, this is an
    // unresolved type.
    assert(TD && "no template for template specialization type")(static_cast <bool> (TD && "no template for template specialization type"
) ? void (0) : __assert_fail ("TD && \"no template for template specialization type\""
, "clang/lib/AST/ItaniumMangle.cpp", 2385, __extension__ __PRETTY_FUNCTION__
));
    if (isa<TemplateTemplateParmDecl>(TD))
      goto unresolvedType;

    mangleSourceNameWithAbiTags(TD);
    break;
  }

  case TemplateName::OverloadedTemplate:
  case TemplateName::AssumedTemplate:
  case TemplateName::DependentTemplate:
    llvm_unreachable("invalid base for a template specialization type")::llvm::llvm_unreachable_internal("invalid base for a template specialization type"
, "clang/lib/AST/ItaniumMangle.cpp", 2396);

  case TemplateName::SubstTemplateTemplateParm: {
    SubstTemplateTemplateParmStorage *subst =
        TN.getAsSubstTemplateTemplateParm();
    mangleExistingSubstitution(subst->getReplacement());
    break;
  }

  case TemplateName::SubstTemplateTemplateParmPack: {
    // FIXME: not clear how to mangle this!
    // template <template <class U> class T...> class A {
    //   template <class U...> void foo(decltype(T<U>::foo) x...);
    // };
    Out << "_SUBSTPACK_";
    break;
  }
  case TemplateName::UsingTemplate: {
    TemplateDecl *TD = TN.getAsTemplateDecl();
    assert(TD && !isa<TemplateTemplateParmDecl>(TD))(static_cast <bool> (TD && !isa<TemplateTemplateParmDecl
>(TD)) ? void (0) : __assert_fail ("TD && !isa<TemplateTemplateParmDecl>(TD)"
, "clang/lib/AST/ItaniumMangle.cpp", 2415, __extension__ __PRETTY_FUNCTION__
));
    mangleSourceNameWithAbiTags(TD);
    break;
  }
  }

  // Note: we don't pass in the template name here. We are mangling the
  // original source-level template arguments, so we shouldn't consider
  // conversions to the corresponding template parameter.
  // FIXME: Other compilers mangle partially-resolved template arguments in
  // unresolved-qualifier-levels.
  mangleTemplateArgs(TemplateName(), TST->template_arguments());
  break;
}

case Type::InjectedClassName:
  mangleSourceNameWithAbiTags(
      cast<InjectedClassNameType>(Ty)->getDecl());
  break;

case Type::DependentName:
  mangleSourceName(cast<DependentNameType>(Ty)->getIdentifier());
  break;

case Type::DependentTemplateSpecialization: {
  const DependentTemplateSpecializationType *DTST =
      cast<DependentTemplateSpecializationType>(Ty);
  TemplateName Template = getASTContext().getDependentTemplateName(
      DTST->getQualifier(), DTST->getIdentifier());
  mangleSourceName(DTST->getIdentifier());
  mangleTemplateArgs(Template, DTST->template_arguments());
  break;
}

case Type::Using:
  return mangleUnresolvedTypeOrSimpleId(cast<UsingType>(Ty)->desugar(),
                                        Prefix);
case Type::Elaborated:
  return mangleUnresolvedTypeOrSimpleId(
      cast<ElaboratedType>(Ty)->getNamedType(), Prefix);
}

return false;
2458}

2460void CXXNameMangler::mangleOperatorName(DeclarationName Name, unsigned Arity) {
switch (Name.getNameKind()) {
case DeclarationName::CXXConstructorName:
case DeclarationName::CXXDestructorName:
case DeclarationName::CXXDeductionGuideName:
case DeclarationName::CXXUsingDirective:
case DeclarationName::Identifier:
case DeclarationName::ObjCMultiArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCZeroArgSelector:
  llvm_unreachable("Not an operator name")::llvm::llvm_unreachable_internal("Not an operator name", "clang/lib/AST/ItaniumMangle.cpp"
, 2470);

case DeclarationName::CXXConversionFunctionName:
  // <operator-name> ::= cv <type>    # (cast)
  Out << "cv";
  mangleType(Name.getCXXNameType());
  break;

case DeclarationName::CXXLiteralOperatorName:
  Out << "li";
  mangleSourceName(Name.getCXXLiteralIdentifier());
  return;

case DeclarationName::CXXOperatorName:
  mangleOperatorName(Name.getCXXOverloadedOperator(), Arity);
  break;
}
2487}

2489void
2490CXXNameMangler::mangleOperatorName(OverloadedOperatorKind OO, unsigned Arity) {
switch (OO) {
// <operator-name> ::= nw     # new
case OO_New: Out << "nw"; break;
//              ::= na        # new[]
case OO_Array_New: Out << "na"; break;
//              ::= dl        # delete
case OO_Delete: Out << "dl"; break;
//              ::= da        # delete[]
case OO_Array_Delete: Out << "da"; break;
//              ::= ps        # + (unary)
//              ::= pl        # + (binary or unknown)
case OO_Plus:
  Out << (Arity == 1? "ps" : "pl"); break;
//              ::= ng        # - (unary)
//              ::= mi        # - (binary or unknown)
case OO_Minus:
  Out << (Arity == 1? "ng" : "mi"); break;
//              ::= ad        # & (unary)
//              ::= an        # & (binary or unknown)
case OO_Amp:
  Out << (Arity == 1? "ad" : "an"); break;
//              ::= de        # * (unary)
//              ::= ml        # * (binary or unknown)
case OO_Star:
  // Use binary when unknown.
  Out << (Arity == 1? "de" : "ml"); break;
//              ::= co        # ~
case OO_Tilde: Out << "co"; break;
//              ::= dv        # /
case OO_Slash: Out << "dv"; break;
//              ::= rm        # %
case OO_Percent: Out << "rm"; break;
//              ::= or        # |
case OO_Pipe: Out << "or"; break;
//              ::= eo        # ^
case OO_Caret: Out << "eo"; break;
//              ::= aS        # =
case OO_Equal: Out << "aS"; break;
//              ::= pL        # +=
case OO_PlusEqual: Out << "pL"; break;
//              ::= mI        # -=
case OO_MinusEqual: Out << "mI"; break;
//              ::= mL        # *=
case OO_StarEqual: Out << "mL"; break;
//              ::= dV        # /=
case OO_SlashEqual: Out << "dV"; break;
//              ::= rM        # %=
case OO_PercentEqual: Out << "rM"; break;
//              ::= aN        # &=
case OO_AmpEqual: Out << "aN"; break;
//              ::= oR        # |=
case OO_PipeEqual: Out << "oR"; break;
//              ::= eO        # ^=
case OO_CaretEqual: Out << "eO"; break;
//              ::= ls        # <<
case OO_LessLess: Out << "ls"; break;
//              ::= rs        # >>
case OO_GreaterGreater: Out << "rs"; break;
//              ::= lS        # <<=
case OO_LessLessEqual: Out << "lS"; break;
//              ::= rS        # >>=
case OO_GreaterGreaterEqual: Out << "rS"; break;
//              ::= eq        # ==
case OO_EqualEqual: Out << "eq"; break;
//              ::= ne        # !=
case OO_ExclaimEqual: Out << "ne"; break;
//              ::= lt        # <
case OO_Less: Out << "lt"; break;
//              ::= gt        # >
case OO_Greater: Out << "gt"; break;
//              ::= le        # <=
case OO_LessEqual: Out << "le"; break;
//              ::= ge        # >=
case OO_GreaterEqual: Out << "ge"; break;
//              ::= nt        # !
case OO_Exclaim: Out << "nt"; break;
//              ::= aa        # &&
case OO_AmpAmp: Out << "aa"; break;
//              ::= oo        # ||
case OO_PipePipe: Out << "oo"; break;
//              ::= pp        # ++
case OO_PlusPlus: Out << "pp"; break;
//              ::= mm        # --
case OO_MinusMinus: Out << "mm"; break;
//              ::= cm        # ,
case OO_Comma: Out << "cm"; break;
//              ::= pm        # ->*
case OO_ArrowStar: Out << "pm"; break;
//              ::= pt        # ->
case OO_Arrow: Out << "pt"; break;
//              ::= cl        # ()
case OO_Call: Out << "cl"; break;
//              ::= ix        # []
case OO_Subscript: Out << "ix"; break;

//              ::= qu        # ?
// The conditional operator can't be overloaded, but we still handle it when
// mangling expressions.
case OO_Conditional: Out << "qu"; break;
// Proposal on cxx-abi-dev, 2015-10-21.
//              ::= aw        # co_await
case OO_Coawait: Out << "aw"; break;
// Proposed in cxx-abi github issue 43.
//              ::= ss        # <=>
case OO_Spaceship: Out << "ss"; break;

case OO_None:
case NUM_OVERLOADED_OPERATORS:
  llvm_unreachable("Not an overloaded operator")::llvm::llvm_unreachable_internal("Not an overloaded operator"
, "clang/lib/AST/ItaniumMangle.cpp", 2599);
}
2601}

2603void CXXNameMangler::mangleQualifiers(Qualifiers Quals, const DependentAddressSpaceType *DAST) {
// Vendor qualifiers come first and if they are order-insensitive they must
// be emitted in reversed alphabetical order, see Itanium ABI 5.1.5.

// <type> ::= U <addrspace-expr>
if (DAST) {
  Out << "U2ASI";
  mangleExpression(DAST->getAddrSpaceExpr());
  Out << "E";
}

// Address space qualifiers start with an ordinary letter.
if (Quals.hasAddressSpace()) {
  // Address space extension:
  //
  //   <type> ::= U <target-addrspace>
  //   <type> ::= U <OpenCL-addrspace>
  //   <type> ::= U <CUDA-addrspace>

  SmallString<64> ASString;
  LangAS AS = Quals.getAddressSpace();

  if (Context.getASTContext().addressSpaceMapManglingFor(AS)) {
    //  <target-addrspace> ::= "AS" <address-space-number>
    unsigned TargetAS = Context.getASTContext().getTargetAddressSpace(AS);
    if (TargetAS != 0 ||
        Context.getASTContext().getTargetAddressSpace(LangAS::Default) != 0)
      ASString = "AS" + llvm::utostr(TargetAS);
  } else {
    switch (AS) {
    default: llvm_unreachable("Not a language specific address space")::llvm::llvm_unreachable_internal("Not a language specific address space"
, "clang/lib/AST/ItaniumMangle.cpp", 2633);
    //  <OpenCL-addrspace> ::= "CL" [ "global" | "local" | "constant" |
    //                                "private"| "generic" | "device" |
    //                                "host" ]
    case LangAS::opencl_global:
      ASString = "CLglobal";
      break;
    case LangAS::opencl_global_device:
      ASString = "CLdevice";
      break;
    case LangAS::opencl_global_host:
      ASString = "CLhost";
      break;
    case LangAS::opencl_local:
      ASString = "CLlocal";
      break;
    case LangAS::opencl_constant:
      ASString = "CLconstant";
      break;
    case LangAS::opencl_private:
      ASString = "CLprivate";
      break;
    case LangAS::opencl_generic:
      ASString = "CLgeneric";
      break;
    //  <SYCL-addrspace> ::= "SY" [ "global" | "local" | "private" |
    //                              "device" | "host" ]
    case LangAS::sycl_global:
      ASString = "SYglobal";
      break;
    case LangAS::sycl_global_device:
      ASString = "SYdevice";
      break;
    case LangAS::sycl_global_host:
      ASString = "SYhost";
      break;
    case LangAS::sycl_local:
      ASString = "SYlocal";
      break;
    case LangAS::sycl_private:
      ASString = "SYprivate";
      break;
    //  <CUDA-addrspace> ::= "CU" [ "device" | "constant" | "shared" ]
    case LangAS::cuda_device:
      ASString = "CUdevice";
      break;
    case LangAS::cuda_constant:
      ASString = "CUconstant";
      break;
    case LangAS::cuda_shared:
      ASString = "CUshared";
      break;
    //  <ptrsize-addrspace> ::= [ "ptr32_sptr" | "ptr32_uptr" | "ptr64" ]
    case LangAS::ptr32_sptr:
      ASString = "ptr32_sptr";
      break;
    case LangAS::ptr32_uptr:
      ASString = "ptr32_uptr";
      break;
    case LangAS::ptr64:
      ASString = "ptr64";
      break;
    }
  }
  if (!ASString.empty())
    mangleVendorQualifier(ASString);
}

// The ARC ownership qualifiers start with underscores.
// Objective-C ARC Extension:
//
//   <type> ::= U "__strong"
//   <type> ::= U "__weak"
//   <type> ::= U "__autoreleasing"
//
// Note: we emit __weak first to preserve the order as
// required by the Itanium ABI.
if (Quals.getObjCLifetime() == Qualifiers::OCL_Weak)
  mangleVendorQualifier("__weak");

// __unaligned (from -fms-extensions)
if (Quals.hasUnaligned())
  mangleVendorQualifier("__unaligned");

// Remaining ARC ownership qualifiers.
switch (Quals.getObjCLifetime()) {
case Qualifiers::OCL_None:
  break;

case Qualifiers::OCL_Weak:
  // Do nothing as we already handled this case above.
  break;

case Qualifiers::OCL_Strong:
  mangleVendorQualifier("__strong");
  break;

case Qualifiers::OCL_Autoreleasing:
  mangleVendorQualifier("__autoreleasing");
  break;

case Qualifiers::OCL_ExplicitNone:
  // The __unsafe_unretained qualifier is *not* mangled, so that
  // __unsafe_unretained types in ARC produce the same manglings as the
  // equivalent (but, naturally, unqualified) types in non-ARC, providing
  // better ABI compatibility.
  //
  // It's safe to do this because unqualified 'id' won't show up
  // in any type signatures that need to be mangled.
  break;
}

// <CV-qualifiers> ::= [r] [V] [K]    # restrict (C99), volatile, const
if (Quals.hasRestrict())
  Out << 'r';
if (Quals.hasVolatile())
  Out << 'V';
if (Quals.hasConst())
  Out << 'K';
2752}

2754void CXXNameMangler::mangleVendorQualifier(StringRef name) {
Out << 'U' << name.size() << name;
2756}

2758void CXXNameMangler::mangleRefQualifier(RefQualifierKind RefQualifier) {
// <ref-qualifier> ::= R                # lvalue reference
//                 ::= O                # rvalue-reference
switch (RefQualifier) {
case RQ_None:
  break;

case RQ_LValue:
  Out << 'R';
  break;

case RQ_RValue:
  Out << 'O';
  break;
}
2773}

2775void CXXNameMangler::mangleObjCMethodName(const ObjCMethodDecl *MD) {
Context.mangleObjCMethodNameAsSourceName(MD, Out);
2777}

2779static bool isTypeSubstitutable(Qualifiers Quals, const Type *Ty,
                              ASTContext &Ctx) {
if (Quals)
  return true;
if (Ty->isSpecificBuiltinType(BuiltinType::ObjCSel))
  return true;
if (Ty->isOpenCLSpecificType())
  return true;
if (Ty->isBuiltinType())
  return false;
// Through to Clang 6.0, we accidentally treated undeduced auto types as
// substitution candidates.
if (Ctx.getLangOpts().getClangABICompat() > LangOptions::ClangABI::Ver6 &&
    isa<AutoType>(Ty))
  return false;
// A placeholder type for class template deduction is substitutable with
// its corresponding template name; this is handled specially when mangling
// the type.
if (auto *DeducedTST = Ty->getAs<DeducedTemplateSpecializationType>())
  if (DeducedTST->getDeducedType().isNull())
    return false;
return true;
2801}

2803void CXXNameMangler::mangleType(QualType T) {
// If our type is instantiation-dependent but not dependent, we mangle
// it as it was written in the source, removing any top-level sugar.
// Otherwise, use the canonical type.
//
// FIXME: This is an approximation of the instantiation-dependent name
// mangling rules, since we should really be using the type as written and
// augmented via semantic analysis (i.e., with implicit conversions and
// default template arguments) for any instantiation-dependent type.
// Unfortunately, that requires several changes to our AST:
//   - Instantiation-dependent TemplateSpecializationTypes will need to be
//     uniqued, so that we can handle substitutions properly
//   - Default template arguments will need to be represented in the
//     TemplateSpecializationType, since they need to be mangled even though
//     they aren't written.
//   - Conversions on non-type template arguments need to be expressed, since
//     they can affect the mangling of sizeof/alignof.
//
// FIXME: This is wrong when mapping to the canonical type for a dependent
// type discards instantiation-dependent portions of the type, such as for:
//
//   template<typename T, int N> void f(T (&)[sizeof(N)]);
//   template<typename T> void f(T() throw(typename T::type)); (pre-C++17)
//
// It's also wrong in the opposite direction when instantiation-dependent,
// canonically-equivalent types differ in some irrelevant portion of inner
// type sugar. In such cases, we fail to form correct substitutions, eg:
//
//   template<int N> void f(A<sizeof(N)> *, A<sizeof(N)> (*));
//
// We should instead canonicalize the non-instantiation-dependent parts,
// regardless of whether the type as a whole is dependent or instantiation
// dependent.
if (!T->isInstantiationDependentType() || T->isDependentType())
  T = T.getCanonicalType();
else {
  // Desugar any types that are purely sugar.
  do {
    // Don't desugar through template specialization types that aren't
    // type aliases. We need to mangle the template arguments as written.
    if (const TemplateSpecializationType *TST
                                    = dyn_cast<TemplateSpecializationType>(T))
      if (!TST->isTypeAlias())
        break;

    // FIXME: We presumably shouldn't strip off ElaboratedTypes with
    // instantation-dependent qualifiers. See
    // https://github.com/itanium-cxx-abi/cxx-abi/issues/114.

    QualType Desugared
      = T.getSingleStepDesugaredType(Context.getASTContext());
    if (Desugared == T)
      break;

    T = Desugared;
  } while (true);
}
SplitQualType split = T.split();
Qualifiers quals = split.Quals;
const Type *ty = split.Ty;

bool isSubstitutable =
  isTypeSubstitutable(quals, ty, Context.getASTContext());
if (isSubstitutable && mangleSubstitution(T))
  return;

// If we're mangling a qualified array type, push the qualifiers to
// the element type.
if (quals && isa<ArrayType>(T)) {
  ty = Context.getASTContext().getAsArrayType(T);
  quals = Qualifiers();

  // Note that we don't update T: we want to add the
  // substitution at the original type.
}

if (quals || ty->isDependentAddressSpaceType()) {
  if (const DependentAddressSpaceType *DAST =
      dyn_cast<DependentAddressSpaceType>(ty)) {
    SplitQualType splitDAST = DAST->getPointeeType().split();
    mangleQualifiers(splitDAST.Quals, DAST);
    mangleType(QualType(splitDAST.Ty, 0));
  } else {
    mangleQualifiers(quals);

    // Recurse:  even if the qualified type isn't yet substitutable,
    // the unqualified type might be.
    mangleType(QualType(ty, 0));
  }
} else {
  switch (ty->getTypeClass()) {
2894#define ABSTRACT_TYPE(CLASS, PARENT)
2895#define NON_CANONICAL_TYPE(CLASS, PARENT) \
  case Type::CLASS: \
    llvm_unreachable("can't mangle non-canonical type " #CLASS "Type")::llvm::llvm_unreachable_internal("can't mangle non-canonical type "
 #CLASS "Type", "clang/lib/AST/ItaniumMangle.cpp", 2897); \
    return;
2899#define TYPE(CLASS, PARENT) \
  case Type::CLASS: \
    mangleType(static_cast<const CLASS##Type*>(ty)); \
    break;
2903#include "clang/AST/TypeNodes.inc"
  }
}

// Add the substitution.
if (isSubstitutable)
  addSubstitution(T);
2910}

2912void CXXNameMangler::mangleNameOrStandardSubstitution(const NamedDecl *ND) {
if (!mangleStandardSubstitution(ND))
2
←
Taking true branch→
  mangleName(ND);
3
←
Calling 'CXXNameMangler::mangleName'→
2915}

2917void CXXNameMangler::mangleType(const BuiltinType *T) {
//  <type>         ::= <builtin-type>
//  <builtin-type> ::= v  # void
//                 ::= w  # wchar_t
//                 ::= b  # bool
//                 ::= c  # char
//                 ::= a  # signed char
//                 ::= h  # unsigned char
//                 ::= s  # short
//                 ::= t  # unsigned short
//                 ::= i  # int
//                 ::= j  # unsigned int
//                 ::= l  # long
//                 ::= m  # unsigned long
//                 ::= x  # long long, __int64
//                 ::= y  # unsigned long long, __int64
//                 ::= n  # __int128
//                 ::= o  # unsigned __int128
//                 ::= f  # float
//                 ::= d  # double
//                 ::= e  # long double, __float80
//                 ::= g  # __float128
//                 ::= g  # __ibm128
// UNSUPPORTED:    ::= Dd # IEEE 754r decimal floating point (64 bits)
// UNSUPPORTED:    ::= De # IEEE 754r decimal floating point (128 bits)
// UNSUPPORTED:    ::= Df # IEEE 754r decimal floating point (32 bits)
//                 ::= Dh # IEEE 754r half-precision floating point (16 bits)
//                 ::= DF <number> _ # ISO/IEC TS 18661 binary floating point type _FloatN (N bits);
//                 ::= Di # char32_t
//                 ::= Ds # char16_t
//                 ::= Dn # std::nullptr_t (i.e., decltype(nullptr))
//                 ::= u <source-name>    # vendor extended type
std::string type_name;
// Normalize integer types as vendor extended types:
// u<length>i<type size>
// u<length>u<type size>
if (NormalizeIntegers && T->isInteger()) {
  if (T->isSignedInteger()) {
    switch (getASTContext().getTypeSize(T)) {
    case 8:
      // Pick a representative for each integer size in the substitution
      // dictionary. (Its actual defined size is not relevant.)
      if (mangleSubstitution(BuiltinType::SChar))
        break;
      Out << "u2i8";
      addSubstitution(BuiltinType::SChar);
      break;
    case 16:
      if (mangleSubstitution(BuiltinType::Short))
        break;
      Out << "u3i16";
      addSubstitution(BuiltinType::Short);
      break;
    case 32:
      if (mangleSubstitution(BuiltinType::Int))
        break;
      Out << "u3i32";
      addSubstitution(BuiltinType::Int);
      break;
    case 64:
      if (mangleSubstitution(BuiltinType::Long))
        break;
      Out << "u3i64";
      addSubstitution(BuiltinType::Long);
      break;
    case 128:
      if (mangleSubstitution(BuiltinType::Int128))
        break;
      Out << "u4i128";
      addSubstitution(BuiltinType::Int128);
      break;
    default:
      llvm_unreachable("Unknown integer size for normalization")::llvm::llvm_unreachable_internal("Unknown integer size for normalization"
, "clang/lib/AST/ItaniumMangle.cpp", 2989);
    }
  } else {
    switch (getASTContext().getTypeSize(T)) {
    case 8:
      if (mangleSubstitution(BuiltinType::UChar))
        break;
      Out << "u2u8";
      addSubstitution(BuiltinType::UChar);
      break;
    case 16:
      if (mangleSubstitution(BuiltinType::UShort))
        break;
      Out << "u3u16";
      addSubstitution(BuiltinType::UShort);
      break;
    case 32:
      if (mangleSubstitution(BuiltinType::UInt))
        break;
      Out << "u3u32";
      addSubstitution(BuiltinType::UInt);
      break;
    case 64:
      if (mangleSubstitution(BuiltinType::ULong))
        break;
      Out << "u3u64";
      addSubstitution(BuiltinType::ULong);
      break;
    case 128:
      if (mangleSubstitution(BuiltinType::UInt128))
        break;
      Out << "u4u128";
      addSubstitution(BuiltinType::UInt128);
      break;
    default:
      llvm_unreachable("Unknown integer size for normalization")::llvm::llvm_unreachable_internal("Unknown integer size for normalization"
, "clang/lib/AST/ItaniumMangle.cpp", 3024);
    }
  }
  return;
}
switch (T->getKind()) {
case BuiltinType::Void:
  Out << 'v';
  break;
case BuiltinType::Bool:
  Out << 'b';
  break;
case BuiltinType::Char_U:
case BuiltinType::Char_S:
  Out << 'c';
  break;
case BuiltinType::UChar:
  Out << 'h';
  break;
case BuiltinType::UShort:
  Out << 't';
  break;
case BuiltinType::UInt:
  Out << 'j';
  break;
case BuiltinType::ULong:
  Out << 'm';
  break;
case BuiltinType::ULongLong:
  Out << 'y';
  break;
case BuiltinType::UInt128:
  Out << 'o';
  break;
case BuiltinType::SChar:
  Out << 'a';
  break;
case BuiltinType::WChar_S:
case BuiltinType::WChar_U:
  Out << 'w';
  break;
case BuiltinType::Char8:
  Out << "Du";
  break;
case BuiltinType::Char16:
  Out << "Ds";
  break;
case BuiltinType::Char32:
  Out << "Di";
  break;
case BuiltinType::Short:
  Out << 's';
  break;
case BuiltinType::Int:
  Out << 'i';
  break;
case BuiltinType::Long:
  Out << 'l';
  break;
case BuiltinType::LongLong:
  Out << 'x';
  break;
case BuiltinType::Int128:
  Out << 'n';
  break;
case BuiltinType::Float16:
  Out << "DF16_";
  break;
case BuiltinType::ShortAccum:
case BuiltinType::Accum:
case BuiltinType::LongAccum:
case BuiltinType::UShortAccum:
case BuiltinType::UAccum:
case BuiltinType::ULongAccum:
case BuiltinType::ShortFract:
case BuiltinType::Fract:
case BuiltinType::LongFract:
case BuiltinType::UShortFract:
case BuiltinType::UFract:
case BuiltinType::ULongFract:
case BuiltinType::SatShortAccum:
case BuiltinType::SatAccum:
case BuiltinType::SatLongAccum:
case BuiltinType::SatUShortAccum:
case BuiltinType::SatUAccum:
case BuiltinType::SatULongAccum:
case BuiltinType::SatShortFract:
case BuiltinType::SatFract:
case BuiltinType::SatLongFract:
case BuiltinType::SatUShortFract:
case BuiltinType::SatUFract:
case BuiltinType::SatULongFract:
  llvm_unreachable("Fixed point types are disabled for c++")::llvm::llvm_unreachable_internal("Fixed point types are disabled for c++"
, "clang/lib/AST/ItaniumMangle.cpp", 3116);
case BuiltinType::Half:
  Out << "Dh";
  break;
case BuiltinType::Float:
  Out << 'f';
  break;
case BuiltinType::Double:
  Out << 'd';
  break;
case BuiltinType::LongDouble: {
  const TargetInfo *TI = getASTContext().getLangOpts().OpenMP &&
                                 getASTContext().getLangOpts().OpenMPIsDevice
                             ? getASTContext().getAuxTargetInfo()
                             : &getASTContext().getTargetInfo();
  Out << TI->getLongDoubleMangling();
  break;
}
case BuiltinType::Float128: {
  const TargetInfo *TI = getASTContext().getLangOpts().OpenMP &&
                                 getASTContext().getLangOpts().OpenMPIsDevice
                             ? getASTContext().getAuxTargetInfo()
                             : &getASTContext().getTargetInfo();
  Out << TI->getFloat128Mangling();
  break;
}
case BuiltinType::BFloat16: {
  const TargetInfo *TI = ((getASTContext().getLangOpts().OpenMP &&
                           getASTContext().getLangOpts().OpenMPIsDevice) ||
                          getASTContext().getLangOpts().SYCLIsDevice)
                             ? getASTContext().getAuxTargetInfo()
                             : &getASTContext().getTargetInfo();
  Out << TI->getBFloat16Mangling();
  break;
}
case BuiltinType::Ibm128: {
  const TargetInfo *TI = &getASTContext().getTargetInfo();
  Out << TI->getIbm128Mangling();
  break;
}
case BuiltinType::NullPtr:
  Out << "Dn";
  break;

3160#define BUILTIN_TYPE(Id, SingletonId)
3161#define PLACEHOLDER_TYPE(Id, SingletonId) \
case BuiltinType::Id:
3163#include "clang/AST/BuiltinTypes.def"
case BuiltinType::Dependent:
  if (!NullOut)
    llvm_unreachable("mangling a placeholder type")::llvm::llvm_unreachable_internal("mangling a placeholder type"
, "clang/lib/AST/ItaniumMangle.cpp", 3166);
  break;
case BuiltinType::ObjCId:
  Out << "11objc_object";
  break;
case BuiltinType::ObjCClass:
  Out << "10objc_class";
  break;
case BuiltinType::ObjCSel:
  Out << "13objc_selector";
  break;
3177#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id: \
  type_name = "ocl_" #ImgType "_" #Suffix; \
  Out << type_name.size() << type_name; \
  break;
3182#include "clang/Basic/OpenCLImageTypes.def"
case BuiltinType::OCLSampler:
  Out << "11ocl_sampler";
  break;
case BuiltinType::OCLEvent:
  Out << "9ocl_event";
  break;
case BuiltinType::OCLClkEvent:
  Out << "12ocl_clkevent";
  break;
case BuiltinType::OCLQueue:
  Out << "9ocl_queue";
  break;
case BuiltinType::OCLReserveID:
  Out << "13ocl_reserveid";
  break;
3198#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id: \
  type_name = "ocl_" #ExtType; \
  Out << type_name.size() << type_name; \
  break;
3203#include "clang/Basic/OpenCLExtensionTypes.def"
// The SVE types are effectively target-specific.  The mangling scheme
// is defined in the appendices to the Procedure Call Standard for the
// Arm Architecture.
3207#define SVE_VECTOR_TYPE(InternalName, MangledName, Id, SingletonId, NumEls,    \
                      ElBits, IsSigned, IsFP, IsBF)                          \
case BuiltinType::Id:                                                        \
  type_name = MangledName;                                                   \
  Out << (type_name == InternalName ? "u" : "") << type_name.size()          \
      << type_name;                                                          \
  break;
3214#define SVE_PREDICATE_TYPE(InternalName, MangledName, Id, SingletonId, NumEls) \
case BuiltinType::Id:                                                        \
  type_name = MangledName;                                                   \
  Out << (type_name == InternalName ? "u" : "") << type_name.size()          \
      << type_name;                                                          \
  break;
3220#define SVE_OPAQUE_TYPE(InternalName, MangledName, Id, SingletonId)            \
case BuiltinType::Id:                                                        \
  type_name = MangledName;                                                   \
  Out << (type_name == InternalName ? "u" : "") << type_name.size()          \
      << type_name;                                                          \
  break;
3226#include "clang/Basic/AArch64SVEACLETypes.def"
3227#define PPC_VECTOR_TYPE(Name, Id, Size) \
case BuiltinType::Id: \
  type_name = #Name; \
  Out << 'u' << type_name.size() << type_name; \
  break;
3232#include "clang/Basic/PPCTypes.def"
  // TODO: Check the mangling scheme for RISC-V V.
3234#define RVV_TYPE(Name, Id, SingletonId)                                        \
case BuiltinType::Id:                                                        \
  type_name = Name;                                                          \
  Out << 'u' << type_name.size() << type_name;                               \
  break;
3239#include "clang/Basic/RISCVVTypes.def"
3240#define WASM_REF_TYPE(InternalName, MangledName, Id, SingletonId, AS)          \
case BuiltinType::Id:                                                        \
  type_name = MangledName;                                                   \
  Out << 'u' << type_name.size() << type_name;                               \
  break;
3245#include "clang/Basic/WebAssemblyReferenceTypes.def"
}
3247}

3249StringRef CXXNameMangler::getCallingConvQualifierName(CallingConv CC) {
switch (CC) {
case CC_C:
  return "";

case CC_X86VectorCall:
case CC_X86Pascal:
case CC_X86RegCall:
case CC_AAPCS:
case CC_AAPCS_VFP:
case CC_AArch64VectorCall:
case CC_AArch64SVEPCS:
case CC_AMDGPUKernelCall:
case CC_IntelOclBicc:
case CC_SpirFunction:
case CC_OpenCLKernel:
case CC_PreserveMost:
case CC_PreserveAll:
  // FIXME: we should be mangling all of the above.
  return "";

case CC_X86ThisCall:
  // FIXME: To match mingw GCC, thiscall should only be mangled in when it is
  // used explicitly. At this point, we don't have that much information in
  // the AST, since clang tends to bake the convention into the canonical
  // function type. thiscall only rarely used explicitly, so don't mangle it
  // for now.
  return "";

case CC_X86StdCall:
  return "stdcall";
case CC_X86FastCall:
  return "fastcall";
case CC_X86_64SysV:
  return "sysv_abi";
case CC_Win64:
  return "ms_abi";
case CC_Swift:
  return "swiftcall";
case CC_SwiftAsync:
  return "swiftasynccall";
}
llvm_unreachable("bad calling convention")::llvm::llvm_unreachable_internal("bad calling convention", "clang/lib/AST/ItaniumMangle.cpp"
, 3291);
3292}

3294void CXXNameMangler::mangleExtFunctionInfo(const FunctionType *T) {
// Fast path.
if (T->getExtInfo() == FunctionType::ExtInfo())
  return;

// Vendor-specific qualifiers are emitted in reverse alphabetical order.
// This will get more complicated in the future if we mangle other
// things here; but for now, since we mangle ns_returns_retained as
// a qualifier on the result type, we can get away with this:
StringRef CCQualifier = getCallingConvQualifierName(T->getExtInfo().getCC());
if (!CCQualifier.empty())
  mangleVendorQualifier(CCQualifier);

// FIXME: regparm
// FIXME: noreturn
3309}

3311void
3312CXXNameMangler::mangleExtParameterInfo(FunctionProtoType::ExtParameterInfo PI) {
// Vendor-specific qualifiers are emitted in reverse alphabetical order.

// Note that these are *not* substitution candidates.  Demanglers might
// have trouble with this if the parameter type is fully substituted.

switch (PI.getABI()) {
case ParameterABI::Ordinary:
  break;

// All of these start with "swift", so they come before "ns_consumed".
case ParameterABI::SwiftContext:
case ParameterABI::SwiftAsyncContext:
case ParameterABI::SwiftErrorResult:
case ParameterABI::SwiftIndirectResult:
  mangleVendorQualifier(getParameterABISpelling(PI.getABI()));
  break;
}

if (PI.isConsumed())
  mangleVendorQualifier("ns_consumed");

if (PI.isNoEscape())
  mangleVendorQualifier("noescape");
3336}

3338// <type>          ::= <function-type>
3339// <function-type> ::= [<CV-qualifiers>] F [Y]
3340//                      <bare-function-type> [<ref-qualifier>] E
3341void CXXNameMangler::mangleType(const FunctionProtoType *T) {
mangleExtFunctionInfo(T);

// Mangle CV-qualifiers, if present.  These are 'this' qualifiers,
// e.g. "const" in "int (A::*)() const".
mangleQualifiers(T->getMethodQuals());

// Mangle instantiation-dependent exception-specification, if present,
// per cxx-abi-dev proposal on 2016-10-11.
if (T->hasInstantiationDependentExceptionSpec()) {
  if (isComputedNoexcept(T->getExceptionSpecType())) {
    Out << "DO";
    mangleExpression(T->getNoexceptExpr());
    Out << "E";
  } else {
    assert(T->getExceptionSpecType() == EST_Dynamic)(static_cast <bool> (T->getExceptionSpecType() == EST_Dynamic
) ? void (0) : __assert_fail ("T->getExceptionSpecType() == EST_Dynamic"
, "clang/lib/AST/ItaniumMangle.cpp", 3356, __extension__ __PRETTY_FUNCTION__
));
    Out << "Dw";
    for (auto ExceptTy : T->exceptions())
      mangleType(ExceptTy);
    Out << "E";
  }
} else if (T->isNothrow()) {
  Out << "Do";
}

Out << 'F';

// FIXME: We don't have enough information in the AST to produce the 'Y'
// encoding for extern "C" function types.
mangleBareFunctionType(T, /*MangleReturnType=*/true);

// Mangle the ref-qualifier, if present.
mangleRefQualifier(T->getRefQualifier());

Out << 'E';
3376}

3378void CXXNameMangler::mangleType(const FunctionNoProtoType *T) {
// Function types without prototypes can arise when mangling a function type
// within an overloadable function in C. We mangle these as the absence of any
// parameter types (not even an empty parameter list).
Out << 'F';

FunctionTypeDepthState saved = FunctionTypeDepth.push();

FunctionTypeDepth.enterResultType();
mangleType(T->getReturnType());
FunctionTypeDepth.leaveResultType();

FunctionTypeDepth.pop(saved);
Out << 'E';
3392}

3394void CXXNameMangler::mangleBareFunctionType(const FunctionProtoType *Proto,
                                          bool MangleReturnType,
                                          const FunctionDecl *FD) {
// Record that we're in a function type.  See mangleFunctionParam
// for details on what we're trying to achieve here.
FunctionTypeDepthState saved = FunctionTypeDepth.push();

// <bare-function-type> ::= <signature type>+
if (MangleReturnType) {
  FunctionTypeDepth.enterResultType();

  // Mangle ns_returns_retained as an order-sensitive qualifier here.
  if (Proto->getExtInfo().getProducesResult() && FD == nullptr)
    mangleVendorQualifier("ns_returns_retained");

  // Mangle the return type without any direct ARC ownership qualifiers.
  QualType ReturnTy = Proto->getReturnType();
  if (ReturnTy.getObjCLifetime()) {
    auto SplitReturnTy = ReturnTy.split();
    SplitReturnTy.Quals.removeObjCLifetime();
    ReturnTy = getASTContext().getQualifiedType(SplitReturnTy);
  }
  mangleType(ReturnTy);

  FunctionTypeDepth.leaveResultType();
}

if (Proto->getNumParams() == 0 && !Proto->isVariadic()) {
  //   <builtin-type> ::= v   # void
  Out << 'v';

  FunctionTypeDepth.pop(saved);
  return;
}

assert(!FD || FD->getNumParams() == Proto->getNumParams())(static_cast <bool> (!FD || FD->getNumParams() == Proto
->getNumParams()) ? void (0) : __assert_fail ("!FD || FD->getNumParams() == Proto->getNumParams()"
, "clang/lib/AST/ItaniumMangle.cpp", 3429, __extension__ __PRETTY_FUNCTION__
));
for (unsigned I = 0, E = Proto->getNumParams(); I != E; ++I) {
  // Mangle extended parameter info as order-sensitive qualifiers here.
  if (Proto->hasExtParameterInfos() && FD == nullptr) {
    mangleExtParameterInfo(Proto->getExtParameterInfo(I));
  }

  // Mangle the type.
  QualType ParamTy = Proto->getParamType(I);
  mangleType(Context.getASTContext().getSignatureParameterType(ParamTy));

  if (FD) {
    if (auto *Attr = FD->getParamDecl(I)->getAttr<PassObjectSizeAttr>()) {
      // Attr can only take 1 character, so we can hardcode the length below.
      assert(Attr->getType() <= 9 && Attr->getType() >= 0)(static_cast <bool> (Attr->getType() <= 9 &&
 Attr->getType() >= 0) ? void (0) : __assert_fail ("Attr->getType() <= 9 && Attr->getType() >= 0"
, "clang/lib/AST/ItaniumMangle.cpp", 3443, __extension__ __PRETTY_FUNCTION__
));
      if (Attr->isDynamic())
        Out << "U25pass_dynamic_object_size" << Attr->getType();
      else
        Out << "U17pass_object_size" << Attr->getType();
    }
  }
}

FunctionTypeDepth.pop(saved);

// <builtin-type>      ::= z  # ellipsis
if (Proto->isVariadic())
  Out << 'z';
3457}

3459// <type>            ::= <class-enum-type>
3460// <class-enum-type> ::= <name>
3461void CXXNameMangler::mangleType(const UnresolvedUsingType *T) {
mangleName(T->getDecl());
3463}

3465// <type>            ::= <class-enum-type>
3466// <class-enum-type> ::= <name>
3467void CXXNameMangler::mangleType(const EnumType *T) {
mangleType(static_cast<const TagType*>(T));
3469}
3470void CXXNameMangler::mangleType(const RecordType *T) {
mangleType(static_cast<const TagType*>(T));
3472}
3473void CXXNameMangler::mangleType(const TagType *T) {
mangleName(T->getDecl());
3475}

3477// <type>       ::= <array-type>
3478// <array-type> ::= A <positive dimension number> _ <element type>
3479//              ::= A [<dimension expression>] _ <element type>
3480void CXXNameMangler::mangleType(const ConstantArrayType *T) {
Out << 'A' << T->getSize() << '_';
mangleType(T->getElementType());
3483}
3484void CXXNameMangler::mangleType(const VariableArrayType *T) {
Out << 'A';
// decayed vla types (size 0) will just be skipped.
if (T->getSizeExpr())
  mangleExpression(T->getSizeExpr());
Out << '_';
mangleType(T->getElementType());
3491}
3492void CXXNameMangler::mangleType(const DependentSizedArrayType *T) {
Out << 'A';
// A DependentSizedArrayType might not have size expression as below
//
// template<int ...N> int arr[] = {N...};
if (T->getSizeExpr())
  mangleExpression(T->getSizeExpr());
Out << '_';
mangleType(T->getElementType());
3501}
3502void CXXNameMangler::mangleType(const IncompleteArrayType *T) {
Out << "A_";
mangleType(T->getElementType());
3505}

3507// <type>                   ::= <pointer-to-member-type>
3508// <pointer-to-member-type> ::= M <class type> <member type>
3509void CXXNameMangler::mangleType(const MemberPointerType *T) {
Out << 'M';
mangleType(QualType(T->getClass(), 0));
QualType PointeeType = T->getPointeeType();
if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(PointeeType)) {
  mangleType(FPT);

  // Itanium C++ ABI 5.1.8:
  //
  //   The type of a non-static member function is considered to be different,
  //   for the purposes of substitution, from the type of a namespace-scope or
  //   static member function whose type appears similar. The types of two
  //   non-static member functions are considered to be different, for the
  //   purposes of substitution, if the functions are members of different
  //   classes. In other words, for the purposes of substitution, the class of
  //   which the function is a member is considered part of the type of
  //   function.

  // Given that we already substitute member function pointers as a
  // whole, the net effect of this rule is just to unconditionally
  // suppress substitution on the function type in a member pointer.
  // We increment the SeqID here to emulate adding an entry to the
  // substitution table.
  ++SeqID;
} else
  mangleType(PointeeType);
3535}

3537// <type>           ::= <template-param>
3538void CXXNameMangler::mangleType(const TemplateTypeParmType *T) {
mangleTemplateParameter(T->getDepth(), T->getIndex());
3540}

3542// <type>           ::= <template-param>
3543void CXXNameMangler::mangleType(const SubstTemplateTypeParmPackType *T) {
// FIXME: not clear how to mangle this!
// template <class T...> class A {
//   template <class U...> void foo(T(*)(U) x...);
// };
Out << "_SUBSTPACK_";
3549}

3551// <type> ::= P <type>   # pointer-to
3552void CXXNameMangler::mangleType(const PointerType *T) {
Out << 'P';
mangleType(T->getPointeeType());
3555}
3556void CXXNameMangler::mangleType(const ObjCObjectPointerType *T) {
Out << 'P';
mangleType(T->getPointeeType());
3559}

3561// <type> ::= R <type>   # reference-to
3562void CXXNameMangler::mangleType(const LValueReferenceType *T) {
Out << 'R';
mangleType(T->getPointeeType());
3565}

3567// <type> ::= O <type>   # rvalue reference-to (C++0x)
3568void CXXNameMangler::mangleType(const RValueReferenceType *T) {
Out << 'O';
mangleType(T->getPointeeType());
3571}

3573// <type> ::= C <type>   # complex pair (C 2000)
3574void CXXNameMangler::mangleType(const ComplexType *T) {
Out << 'C';
mangleType(T->getElementType());
3577}

3579// ARM's ABI for Neon vector types specifies that they should be mangled as
3580// if they are structs (to match ARM's initial implementation).  The
3581// vector type must be one of the special types predefined by ARM.
3582void CXXNameMangler::mangleNeonVectorType(const VectorType *T) {
QualType EltType = T->getElementType();
assert(EltType->isBuiltinType() && "Neon vector element not a BuiltinType")(static_cast <bool> (EltType->isBuiltinType() &&
 "Neon vector element not a BuiltinType") ? void (0) : __assert_fail
 ("EltType->isBuiltinType() && \"Neon vector element not a BuiltinType\""
, "clang/lib/AST/ItaniumMangle.cpp", 3584, __extension__ __PRETTY_FUNCTION__
));
const char *EltName = nullptr;
if (T->getVectorKind() == VectorType::NeonPolyVector) {
  switch (cast<BuiltinType>(EltType)->getKind()) {
  case BuiltinType::SChar:
  case BuiltinType::UChar:
    EltName = "poly8_t";
    break;
  case BuiltinType::Short:
  case BuiltinType::UShort:
    EltName = "poly16_t";
    break;
  case BuiltinType::LongLong:
  case BuiltinType::ULongLong:
    EltName = "poly64_t";
    break;
  default: llvm_unreachable("unexpected Neon polynomial vector element type")::llvm::llvm_unreachable_internal("unexpected Neon polynomial vector element type"
, "clang/lib/AST/ItaniumMangle.cpp", 3600);
  }
} else {
  switch (cast<BuiltinType>(EltType)->getKind()) {
  case BuiltinType::SChar:     EltName = "int8_t"; break;
  case BuiltinType::UChar:     EltName = "uint8_t"; break;
  case BuiltinType::Short:     EltName = "int16_t"; break;
  case BuiltinType::UShort:    EltName = "uint16_t"; break;
  case BuiltinType::Int:       EltName = "int32_t"; break;
  case BuiltinType::UInt:      EltName = "uint32_t"; break;
  case BuiltinType::LongLong:  EltName = "int64_t"; break;
  case BuiltinType::ULongLong: EltName = "uint64_t"; break;
  case BuiltinType::Double:    EltName = "float64_t"; break;
  case BuiltinType::Float:     EltName = "float32_t"; break;
  case BuiltinType::Half:      EltName = "float16_t"; break;
  case BuiltinType::BFloat16:  EltName = "bfloat16_t"; break;
  default:
    llvm_unreachable("unexpected Neon vector element type")::llvm::llvm_unreachable_internal("unexpected Neon vector element type"
, "clang/lib/AST/ItaniumMangle.cpp", 3617);
  }
}
const char *BaseName = nullptr;
unsigned BitSize = (T->getNumElements() *
                    getASTContext().getTypeSize(EltType));
if (BitSize == 64)
  BaseName = "__simd64_";
else {
  assert(BitSize == 128 && "Neon vector type not 64 or 128 bits")(static_cast <bool> (BitSize == 128 && "Neon vector type not 64 or 128 bits"
) ? void (0) : __assert_fail ("BitSize == 128 && \"Neon vector type not 64 or 128 bits\""
, "clang/lib/AST/ItaniumMangle.cpp", 3626, __extension__ __PRETTY_FUNCTION__
));
  BaseName = "__simd128_";
}
Out << strlen(BaseName) + strlen(EltName);
Out << BaseName << EltName;
3631}

3633void CXXNameMangler::mangleNeonVectorType(const DependentVectorType *T) {
DiagnosticsEngine &Diags = Context.getDiags();
unsigned DiagID = Diags.getCustomDiagID(
    DiagnosticsEngine::Error,
    "cannot mangle this dependent neon vector type yet");
Diags.Report(T->getAttributeLoc(), DiagID);
3639}

3641static StringRef mangleAArch64VectorBase(const BuiltinType *EltType) {
switch (EltType->getKind()) {
case BuiltinType::SChar:
  return "Int8";
case BuiltinType::Short:
  return "Int16";
case BuiltinType::Int:
  return "Int32";
case BuiltinType::Long:
case BuiltinType::LongLong:
  return "Int64";
case BuiltinType::UChar:
  return "Uint8";
case BuiltinType::UShort:
  return "Uint16";
case BuiltinType::UInt:
  return "Uint32";
case BuiltinType::ULong:
case BuiltinType::ULongLong:
  return "Uint64";
case BuiltinType::Half:
  return "Float16";
case BuiltinType::Float:
  return "Float32";
case BuiltinType::Double:
  return "Float64";
case BuiltinType::BFloat16:
  return "Bfloat16";
default:
  llvm_unreachable("Unexpected vector element base type")::llvm::llvm_unreachable_internal("Unexpected vector element base type"
, "clang/lib/AST/ItaniumMangle.cpp", 3670);
}
3672}

3674// AArch64's ABI for Neon vector types specifies that they should be mangled as
3675// the equivalent internal name. The vector type must be one of the special
3676// types predefined by ARM.
3677void CXXNameMangler::mangleAArch64NeonVectorType(const VectorType *T) {
QualType EltType = T->getElementType();
assert(EltType->isBuiltinType() && "Neon vector element not a BuiltinType")(static_cast <bool> (EltType->isBuiltinType() &&
 "Neon vector element not a BuiltinType") ? void (0) : __assert_fail
 ("EltType->isBuiltinType() && \"Neon vector element not a BuiltinType\""
, "clang/lib/AST/ItaniumMangle.cpp", 3679, __extension__ __PRETTY_FUNCTION__
));
unsigned BitSize =
    (T->getNumElements() * getASTContext().getTypeSize(EltType));
(void)BitSize; // Silence warning.

assert((BitSize == 64 || BitSize == 128) &&(static_cast <bool> ((BitSize == 64 || BitSize == 128) &&
 "Neon vector type not 64 or 128 bits") ? void (0) : __assert_fail
 ("(BitSize == 64 || BitSize == 128) && \"Neon vector type not 64 or 128 bits\""
, "clang/lib/AST/ItaniumMangle.cpp", 3685, __extension__ __PRETTY_FUNCTION__
))
       "Neon vector type not 64 or 128 bits")(static_cast <bool> ((BitSize == 64 || BitSize == 128) &&
 "Neon vector type not 64 or 128 bits") ? void (0) : __assert_fail
 ("(BitSize == 64 || BitSize == 128) && \"Neon vector type not 64 or 128 bits\""
, "clang/lib/AST/ItaniumMangle.cpp", 3685, __extension__ __PRETTY_FUNCTION__
));

StringRef EltName;
if (T->getVectorKind() == VectorType::NeonPolyVector) {
  switch (cast<BuiltinType>(EltType)->getKind()) {
  case BuiltinType::UChar:
    EltName = "Poly8";
    break;
  case BuiltinType::UShort:
    EltName = "Poly16";
    break;
  case BuiltinType::ULong:
  case BuiltinType::ULongLong:
    EltName = "Poly64";
    break;
  default:
    llvm_unreachable("unexpected Neon polynomial vector element type")::llvm::llvm_unreachable_internal("unexpected Neon polynomial vector element type"
, "clang/lib/AST/ItaniumMangle.cpp", 3701);
  }
} else
  EltName = mangleAArch64VectorBase(cast<BuiltinType>(EltType));

std::string TypeName =
    ("__" + EltName + "x" + Twine(T->getNumElements()) + "_t").str();
Out << TypeName.length() << TypeName;
3709}
3710void CXXNameMangler::mangleAArch64NeonVectorType(const DependentVectorType *T) {
DiagnosticsEngine &Diags = Context.getDiags();
unsigned DiagID = Diags.getCustomDiagID(
    DiagnosticsEngine::Error,
    "cannot mangle this dependent neon vector type yet");
Diags.Report(T->getAttributeLoc(), DiagID);
3716}

3718// The AArch64 ACLE specifies that fixed-length SVE vector and predicate types
3719// defined with the 'arm_sve_vector_bits' attribute map to the same AAPCS64
3720// type as the sizeless variants.
3721//
3722// The mangling scheme for VLS types is implemented as a "pseudo" template:
3723//
3724//   '__SVE_VLS<<type>, <vector length>>'
3725//
3726// Combining the existing SVE type and a specific vector length (in bits).
3727// For example:
3728//
3729//   typedef __SVInt32_t foo __attribute__((arm_sve_vector_bits(512)));
3730//
3731// is described as '__SVE_VLS<__SVInt32_t, 512u>' and mangled as:
3732//
3733//   "9__SVE_VLSI" + base type mangling + "Lj" + __ARM_FEATURE_SVE_BITS + "EE"
3734//
3735//   i.e. 9__SVE_VLSIu11__SVInt32_tLj512EE
3736//
3737// The latest ACLE specification (00bet5) does not contain details of this
3738// mangling scheme, it will be specified in the next revision. The mangling
3739// scheme is otherwise defined in the appendices to the Procedure Call Standard
3740// for the Arm Architecture, see
3741// https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#appendix-c-mangling
3742void CXXNameMangler::mangleAArch64FixedSveVectorType(const VectorType *T) {
assert((T->getVectorKind() == VectorType::SveFixedLengthDataVector ||(static_cast <bool> ((T->getVectorKind() == VectorType
::SveFixedLengthDataVector || T->getVectorKind() == VectorType
::SveFixedLengthPredicateVector) && "expected fixed-length SVE vector!"
) ? void (0) : __assert_fail ("(T->getVectorKind() == VectorType::SveFixedLengthDataVector || T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) && \"expected fixed-length SVE vector!\""
, "clang/lib/AST/ItaniumMangle.cpp", 3745, __extension__ __PRETTY_FUNCTION__
))
        T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) &&(static_cast <bool> ((T->getVectorKind() == VectorType
::SveFixedLengthDataVector || T->getVectorKind() == VectorType
::SveFixedLengthPredicateVector) && "expected fixed-length SVE vector!"
) ? void (0) : __assert_fail ("(T->getVectorKind() == VectorType::SveFixedLengthDataVector || T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) && \"expected fixed-length SVE vector!\""
, "clang/lib/AST/ItaniumMangle.cpp", 3745, __extension__ __PRETTY_FUNCTION__
))
       "expected fixed-length SVE vector!")(static_cast <bool> ((T->getVectorKind() == VectorType
::SveFixedLengthDataVector || T->getVectorKind() == VectorType
::SveFixedLengthPredicateVector) && "expected fixed-length SVE vector!"
) ? void (0) : __assert_fail ("(T->getVectorKind() == VectorType::SveFixedLengthDataVector || T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) && \"expected fixed-length SVE vector!\""
, "clang/lib/AST/ItaniumMangle.cpp", 3745, __extension__ __PRETTY_FUNCTION__
));

QualType EltType = T->getElementType();
assert(EltType->isBuiltinType() &&(static_cast <bool> (EltType->isBuiltinType() &&
 "expected builtin type for fixed-length SVE vector!") ? void
 (0) : __assert_fail ("EltType->isBuiltinType() && \"expected builtin type for fixed-length SVE vector!\""
, "clang/lib/AST/ItaniumMangle.cpp", 3749, __extension__ __PRETTY_FUNCTION__
))
       "expected builtin type for fixed-length SVE vector!")(static_cast <bool> (EltType->isBuiltinType() &&
 "expected builtin type for fixed-length SVE vector!") ? void
 (0) : __assert_fail ("EltType->isBuiltinType() && \"expected builtin type for fixed-length SVE vector!\""
, "clang/lib/AST/ItaniumMangle.cpp", 3749, __extension__ __PRETTY_FUNCTION__
));

StringRef TypeName;
switch (cast<BuiltinType>(EltType)->getKind()) {
case BuiltinType::SChar:
  TypeName = "__SVInt8_t";
  break;
case BuiltinType::UChar: {
  if (T->getVectorKind() == VectorType::SveFixedLengthDataVector)
    TypeName = "__SVUint8_t";
  else
    TypeName = "__SVBool_t";
  break;
}
case BuiltinType::Short:
  TypeName = "__SVInt16_t";
  break;
case BuiltinType::UShort:
  TypeName = "__SVUint16_t";
  break;
case BuiltinType::Int:
  TypeName = "__SVInt32_t";
  break;
case BuiltinType::UInt:
  TypeName = "__SVUint32_t";
  break;
case BuiltinType::Long:
  TypeName = "__SVInt64_t";
  break;
case BuiltinType::ULong:
  TypeName = "__SVUint64_t";
  break;
case BuiltinType::Half:
  TypeName = "__SVFloat16_t";
  break;
case BuiltinType::Float:
  TypeName = "__SVFloat32_t";
  break;
case BuiltinType::Double:
  TypeName = "__SVFloat64_t";
  break;
case BuiltinType::BFloat16:
  TypeName = "__SVBfloat16_t";
  break;
default:
  llvm_unreachable("unexpected element type for fixed-length SVE vector!")::llvm::llvm_unreachable_internal("unexpected element type for fixed-length SVE vector!"
, "clang/lib/AST/ItaniumMangle.cpp", 3794);
}

unsigned VecSizeInBits = getASTContext().getTypeInfo(T).Width;

if (T->getVectorKind() == VectorType::SveFixedLengthPredicateVector)
  VecSizeInBits *= 8;

Out << "9__SVE_VLSI" << 'u' << TypeName.size() << TypeName << "Lj"
    << VecSizeInBits << "EE";
3804}

3806void CXXNameMangler::mangleAArch64FixedSveVectorType(
  const DependentVectorType *T) {
DiagnosticsEngine &Diags = Context.getDiags();
unsigned DiagID = Diags.getCustomDiagID(
    DiagnosticsEngine::Error,
    "cannot mangle this dependent fixed-length SVE vector type yet");
Diags.Report(T->getAttributeLoc(), DiagID);
3813}

3815// GNU extension: vector types
3816// <type>                  ::= <vector-type>
3817// <vector-type>           ::= Dv <positive dimension number> _
3818//                                    <extended element type>
3819//                         ::= Dv [<dimension expression>] _ <element type>
3820// <extended element type> ::= <element type>
3821//                         ::= p # AltiVec vector pixel
3822//                         ::= b # Altivec vector bool
3823void CXXNameMangler::mangleType(const VectorType *T) {
if ((T->getVectorKind() == VectorType::NeonVector ||
     T->getVectorKind() == VectorType::NeonPolyVector)) {
  llvm::Triple Target = getASTContext().getTargetInfo().getTriple();
  llvm::Triple::ArchType Arch =
      getASTContext().getTargetInfo().getTriple().getArch();
  if ((Arch == llvm::Triple::aarch64 ||
       Arch == llvm::Triple::aarch64_be) && !Target.isOSDarwin())
    mangleAArch64NeonVectorType(T);
  else
    mangleNeonVectorType(T);
  return;
} else if (T->getVectorKind() == VectorType::SveFixedLengthDataVector ||
           T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) {
  mangleAArch64FixedSveVectorType(T);
  return;
}
Out << "Dv" << T->getNumElements() << '_';
if (T->getVectorKind() == VectorType::AltiVecPixel)
  Out << 'p';
else if (T->getVectorKind() == VectorType::AltiVecBool)
  Out << 'b';
else
  mangleType(T->getElementType());
3847}

3849void CXXNameMangler::mangleType(const DependentVectorType *T) {
if ((T->getVectorKind() == VectorType::NeonVector ||
     T->getVectorKind() == VectorType::NeonPolyVector)) {
  llvm::Triple Target = getASTContext().getTargetInfo().getTriple();
  llvm::Triple::ArchType Arch =
      getASTContext().getTargetInfo().getTriple().getArch();
  if ((Arch == llvm::Triple::aarch64 || Arch == llvm::Triple::aarch64_be) &&
      !Target.isOSDarwin())
    mangleAArch64NeonVectorType(T);
  else
    mangleNeonVectorType(T);
  return;
} else if (T->getVectorKind() == VectorType::SveFixedLengthDataVector ||
           T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) {
  mangleAArch64FixedSveVectorType(T);
  return;
}

Out << "Dv";
mangleExpression(T->getSizeExpr());
Out << '_';
if (T->getVectorKind() == VectorType::AltiVecPixel)
  Out << 'p';
else if (T->getVectorKind() == VectorType::AltiVecBool)
  Out << 'b';
else
  mangleType(T->getElementType());
3876}

3878void CXXNameMangler::mangleType(const ExtVectorType *T) {
mangleType(static_cast<const VectorType*>(T));
3880}
3881void CXXNameMangler::mangleType(const DependentSizedExtVectorType *T) {
Out << "Dv";
mangleExpression(T->getSizeExpr());
Out << '_';
mangleType(T->getElementType());
3886}

3888void CXXNameMangler::mangleType(const ConstantMatrixType *T) {
// Mangle matrix types as a vendor extended type:
// u<Len>matrix_typeI<Rows><Columns><element type>E

StringRef VendorQualifier = "matrix_type";
Out << "u" << VendorQualifier.size() << VendorQualifier;

Out << "I";
auto &ASTCtx = getASTContext();
unsigned BitWidth = ASTCtx.getTypeSize(ASTCtx.getSizeType());
llvm::APSInt Rows(BitWidth);
Rows = T->getNumRows();
mangleIntegerLiteral(ASTCtx.getSizeType(), Rows);
llvm::APSInt Columns(BitWidth);
Columns = T->getNumColumns();
mangleIntegerLiteral(ASTCtx.getSizeType(), Columns);
mangleType(T->getElementType());
Out << "E";
3906}

3908void CXXNameMangler::mangleType(const DependentSizedMatrixType *T) {
// Mangle matrix types as a vendor extended type:
// u<Len>matrix_typeI<row expr><column expr><element type>E
StringRef VendorQualifier = "matrix_type";
Out << "u" << VendorQualifier.size() << VendorQualifier;

Out << "I";
mangleTemplateArgExpr(T->getRowExpr());
mangleTemplateArgExpr(T->getColumnExpr());
mangleType(T->getElementType());
Out << "E";
3919}

3921void CXXNameMangler::mangleType(const DependentAddressSpaceType *T) {
SplitQualType split = T->getPointeeType().split();
mangleQualifiers(split.Quals, T);
mangleType(QualType(split.Ty, 0));
3925}

3927void CXXNameMangler::mangleType(const PackExpansionType *T) {
// <type>  ::= Dp <type>          # pack expansion (C++0x)
Out << "Dp";
mangleType(T->getPattern());
3931}

3933void CXXNameMangler::mangleType(const ObjCInterfaceType *T) {
mangleSourceName(T->getDecl()->getIdentifier());
3935}

3937void CXXNameMangler::mangleType(const ObjCObjectType *T) {
// Treat __kindof as a vendor extended type qualifier.
if (T->isKindOfType())
  Out << "U8__kindof";

if (!T->qual_empty()) {
  // Mangle protocol qualifiers.
  SmallString<64> QualStr;
  llvm::raw_svector_ostream QualOS(QualStr);
  QualOS << "objcproto";
  for (const auto *I : T->quals()) {
    StringRef name = I->getName();
    QualOS << name.size() << name;
  }
  Out << 'U' << QualStr.size() << QualStr;
}

mangleType(T->getBaseType());

if (T->isSpecialized()) {
  // Mangle type arguments as I <type>+ E
  Out << 'I';
  for (auto typeArg : T->getTypeArgs())
    mangleType(typeArg);
  Out << 'E';
}
3963}

3965void CXXNameMangler::mangleType(const BlockPointerType *T) {
Out << "U13block_pointer";
mangleType(T->getPointeeType());
3968}

3970void CXXNameMangler::mangleType(const InjectedClassNameType *T) {
// Mangle injected class name types as if the user had written the
// specialization out fully.  It may not actually be possible to see
// this mangling, though.
mangleType(T->getInjectedSpecializationType());
3975}

3977void CXXNameMangler::mangleType(const TemplateSpecializationType *T) {
if (TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl()) {
  mangleTemplateName(TD, T->template_arguments());
} else {
  if (mangleSubstitution(QualType(T, 0)))
    return;

  mangleTemplatePrefix(T->getTemplateName());

  // FIXME: GCC does not appear to mangle the template arguments when
  // the template in question is a dependent template name. Should we
  // emulate that badness?
  mangleTemplateArgs(T->getTemplateName(), T->template_arguments());
  addSubstitution(QualType(T, 0));
}
3992}

3994void CXXNameMangler::mangleType(const DependentNameType *T) {
// Proposal by cxx-abi-dev, 2014-03-26
// <class-enum-type> ::= <name>    # non-dependent or dependent type name or
//                                 # dependent elaborated type specifier using
//                                 # 'typename'
//                   ::= Ts <name> # dependent elaborated type specifier using
//                                 # 'struct' or 'class'
//                   ::= Tu <name> # dependent elaborated type specifier using
//                                 # 'union'
//                   ::= Te <name> # dependent elaborated type specifier using
//                                 # 'enum'
switch (T->getKeyword()) {
  case ETK_None:
  case ETK_Typename:
    break;
  case ETK_Struct:
  case ETK_Class:
  case ETK_Interface:
    Out << "Ts";
    break;
  case ETK_Union:
    Out << "Tu";
    break;
  case ETK_Enum:
    Out << "Te";
    break;
}
// Typename types are always nested
Out << 'N';
manglePrefix(T->getQualifier());
mangleSourceName(T->getIdentifier());
Out << 'E';
4026}

4028void CXXNameMangler::mangleType(const DependentTemplateSpecializationType *T) {
// Dependently-scoped template types are nested if they have a prefix.
Out << 'N';

// TODO: avoid making this TemplateName.
TemplateName Prefix =
  getASTContext().getDependentTemplateName(T->getQualifier(),
                                           T->getIdentifier());
mangleTemplatePrefix(Prefix);

// FIXME: GCC does not appear to mangle the template arguments when
// the template in question is a dependent template name. Should we
// emulate that badness?
mangleTemplateArgs(Prefix, T->template_arguments());
Out << 'E';
4043}

4045void CXXNameMangler::mangleType(const TypeOfType *T) {
// FIXME: this is pretty unsatisfactory, but there isn't an obvious
// "extension with parameters" mangling.
Out << "u6typeof";
4049}

4051void CXXNameMangler::mangleType(const TypeOfExprType *T) {
// FIXME: this is pretty unsatisfactory, but there isn't an obvious
// "extension with parameters" mangling.
Out << "u6typeof";
4055}

4057void CXXNameMangler::mangleType(const DecltypeType *T) {
Expr *E = T->getUnderlyingExpr();

// type ::= Dt <expression> E  # decltype of an id-expression
//                             #   or class member access
//      ::= DT <expression> E  # decltype of an expression

// This purports to be an exhaustive list of id-expressions and
// class member accesses.  Note that we do not ignore parentheses;
// parentheses change the semantics of decltype for these
// expressions (and cause the mangler to use the other form).
if (isa<DeclRefExpr>(E) ||
    isa<MemberExpr>(E) ||
    isa<UnresolvedLookupExpr>(E) ||
    isa<DependentScopeDeclRefExpr>(E) ||
    isa<CXXDependentScopeMemberExpr>(E) ||
    isa<UnresolvedMemberExpr>(E))
  Out << "Dt";
else
  Out << "DT";
mangleExpression(E);
Out << 'E';
4079}

4081void CXXNameMangler::mangleType(const UnaryTransformType *T) {
// If this is dependent, we need to record that. If not, we simply
// mangle it as the underlying type since they are equivalent.
if (T->isDependentType()) {
  Out << "u";

  StringRef BuiltinName;
  switch (T->getUTTKind()) {
4089#define TRANSFORM_TYPE_TRAIT_DEF(Enum, Trait)                                  \
case UnaryTransformType::Enum:                                               \
  BuiltinName = "__" #Trait;                                                 \
  break;
4093#include "clang/Basic/TransformTypeTraits.def"
  }
  Out << BuiltinName.size() << BuiltinName;
}

Out << "I";
mangleType(T->getBaseType());
Out << "E";
4101}

4103void CXXNameMangler::mangleType(const AutoType *T) {
assert(T->getDeducedType().isNull() &&(static_cast <bool> (T->getDeducedType().isNull() &&
 "Deduced AutoType shouldn't be handled here!") ? void (0) : __assert_fail
 ("T->getDeducedType().isNull() && \"Deduced AutoType shouldn't be handled here!\""
, "clang/lib/AST/ItaniumMangle.cpp", 4105, __extension__ __PRETTY_FUNCTION__
))
       "Deduced AutoType shouldn't be handled here!")(static_cast <bool> (T->getDeducedType().isNull() &&
 "Deduced AutoType shouldn't be handled here!") ? void (0) : __assert_fail
 ("T->getDeducedType().isNull() && \"Deduced AutoType shouldn't be handled here!\""
, "clang/lib/AST/ItaniumMangle.cpp", 4105, __extension__ __PRETTY_FUNCTION__
));
assert(T->getKeyword() != AutoTypeKeyword::GNUAutoType &&(static_cast <bool> (T->getKeyword() != AutoTypeKeyword
::GNUAutoType && "shouldn't need to mangle __auto_type!"
) ? void (0) : __assert_fail ("T->getKeyword() != AutoTypeKeyword::GNUAutoType && \"shouldn't need to mangle __auto_type!\""
, "clang/lib/AST/ItaniumMangle.cpp", 4107, __extension__ __PRETTY_FUNCTION__
))
       "shouldn't need to mangle __auto_type!")(static_cast <bool> (T->getKeyword() != AutoTypeKeyword
::GNUAutoType && "shouldn't need to mangle __auto_type!"
) ? void (0) : __assert_fail ("T->getKeyword() != AutoTypeKeyword::GNUAutoType && \"shouldn't need to mangle __auto_type!\""
, "clang/lib/AST/ItaniumMangle.cpp", 4107, __extension__ __PRETTY_FUNCTION__
));
// <builtin-type> ::= Da # auto
//                ::= Dc # decltype(auto)
Out << (T->isDecltypeAuto() ? "Dc" : "Da");
4111}

4113void CXXNameMangler::mangleType(const DeducedTemplateSpecializationType *T) {
QualType Deduced = T->getDeducedType();
if (!Deduced.isNull())
  return mangleType(Deduced);

TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl();
assert(TD && "shouldn't form deduced TST unless we know we have a template")(static_cast <bool> (TD && "shouldn't form deduced TST unless we know we have a template"
) ? void (0) : __assert_fail ("TD && \"shouldn't form deduced TST unless we know we have a template\""
, "clang/lib/AST/ItaniumMangle.cpp", 4119, __extension__ __PRETTY_FUNCTION__
));

if (mangleSubstitution(TD))
  return;

mangleName(GlobalDecl(TD));
addSubstitution(TD);
4126}

4128void CXXNameMangler::mangleType(const AtomicType *T) {
// <type> ::= U <source-name> <type>  # vendor extended type qualifier
// (Until there's a standardized mangling...)
Out << "U7_Atomic";
mangleType(T->getValueType());
4133}

4135void CXXNameMangler::mangleType(const PipeType *T) {
// Pipe type mangling rules are described in SPIR 2.0 specification
// A.1 Data types and A.3 Summary of changes
// <type> ::= 8ocl_pipe
Out << "8ocl_pipe";
4140}

4142void CXXNameMangler::mangleType(const BitIntType *T) {
// 5.1.5.2 Builtin types
// <type> ::= DB <number | instantiation-dependent expression> _
//        ::= DU <number | instantiation-dependent expression> _
Out << "D" << (T->isUnsigned() ? "U" : "B") << T->getNumBits() << "_";
4147}

4149void CXXNameMangler::mangleType(const DependentBitIntType *T) {
// 5.1.5.2 Builtin types
// <type> ::= DB <number | instantiation-dependent expression> _
//        ::= DU <number | instantiation-dependent expression> _
Out << "D" << (T->isUnsigned() ? "U" : "B");
mangleExpression(T->getNumBitsExpr());
Out << "_";
4156}

4158void CXXNameMangler::mangleIntegerLiteral(QualType T,
                                        const llvm::APSInt &Value) {
//  <expr-primary> ::= L <type> <value number> E # integer literal
Out << 'L';

mangleType(T);
if (T->isBooleanType()) {
  // Boolean values are encoded as 0/1.
  Out << (Value.getBoolValue() ? '1' : '0');
} else {
  mangleNumber(Value);
}
Out << 'E';

4172}

4174void CXXNameMangler::mangleMemberExprBase(const Expr *Base, bool IsArrow) {
// Ignore member expressions involving anonymous unions.
while (const auto *RT = Base->getType()->getAs<RecordType>()) {
  if (!RT->getDecl()->isAnonymousStructOrUnion())
    break;
  const auto *ME = dyn_cast<MemberExpr>(Base);
  if (!ME)
    break;
  Base = ME->getBase();
  IsArrow = ME->isArrow();
}

if (Base->isImplicitCXXThis()) {
  // Note: GCC mangles member expressions to the implicit 'this' as
  // *this., whereas we represent them as this->. The Itanium C++ ABI
  // does not specify anything here, so we follow GCC.
  Out << "dtdefpT";
} else {
  Out << (IsArrow ? "pt" : "dt");
  mangleExpression(Base);
}
4195}

4197/// Mangles a member expression.
4198void CXXNameMangler::mangleMemberExpr(const Expr *base,
                                    bool isArrow,
                                    NestedNameSpecifier *qualifier,
                                    NamedDecl *firstQualifierLookup,
                                    DeclarationName member,
                                    const TemplateArgumentLoc *TemplateArgs,
                                    unsigned NumTemplateArgs,
                                    unsigned arity) {
// <expression> ::= dt <expression> <unresolved-name>
//              ::= pt <expression> <unresolved-name>
if (base)
  mangleMemberExprBase(base, isArrow);
mangleUnresolvedName(qualifier, member, TemplateArgs, NumTemplateArgs, arity);
4211}

4213/// Look at the callee of the given call expression and determine if
4214/// it's a parenthesized id-expression which would have triggered ADL
4215/// otherwise.
4216static bool isParenthesizedADLCallee(const CallExpr *call) {
const Expr *callee = call->getCallee();
const Expr *fn = callee->IgnoreParens();

// Must be parenthesized.  IgnoreParens() skips __extension__ nodes,
// too, but for those to appear in the callee, it would have to be
// parenthesized.
if (callee == fn) return false;

// Must be an unresolved lookup.
const UnresolvedLookupExpr *lookup = dyn_cast<UnresolvedLookupExpr>(fn);
if (!lookup) return false;

assert(!lookup->requiresADL())(static_cast <bool> (!lookup->requiresADL()) ? void (
0) : __assert_fail ("!lookup->requiresADL()", "clang/lib/AST/ItaniumMangle.cpp"
, 4229, __extension__ __PRETTY_FUNCTION__));

// Must be an unqualified lookup.
if (lookup->getQualifier()) return false;

// Must not have found a class member.  Note that if one is a class
// member, they're all class members.
if (lookup->getNumDecls() > 0 &&
    (*lookup->decls_begin())->isCXXClassMember())
  return false;

// Otherwise, ADL would have been triggered.
return true;
4242}

4244void CXXNameMangler::mangleCastExpression(const Expr *E, StringRef CastEncoding) {
const ExplicitCastExpr *ECE = cast<ExplicitCastExpr>(E);
Out << CastEncoding;
mangleType(ECE->getType());
mangleExpression(ECE->getSubExpr());
4249}

4251void CXXNameMangler::mangleInitListElements(const InitListExpr *InitList) {
if (auto *Syntactic = InitList->getSyntacticForm())
  InitList = Syntactic;
for (unsigned i = 0, e = InitList->getNumInits(); i != e; ++i)
  mangleExpression(InitList->getInit(i));
4256}

4258void CXXNameMangler::mangleExpression(const Expr *E, unsigned Arity,
                                    bool AsTemplateArg) {
// <expression> ::= <unary operator-name> <expression>
//              ::= <binary operator-name> <expression> <expression>
//              ::= <trinary operator-name> <expression> <expression> <expression>
//              ::= cv <type> expression           # conversion with one argument
//              ::= cv <type> _ <expression>* E # conversion with a different number of arguments
//              ::= dc <type> <expression>         # dynamic_cast<type> (expression)
//              ::= sc <type> <expression>         # static_cast<type> (expression)
//              ::= cc <type> <expression>         # const_cast<type> (expression)
//              ::= rc <type> <expression>         # reinterpret_cast<type> (expression)
//              ::= st <type>                      # sizeof (a type)
//              ::= at <type>                      # alignof (a type)
//              ::= <template-param>
//              ::= <function-param>
//              ::= fpT                            # 'this' expression (part of <function-param>)
//              ::= sr <type> <unqualified-name>                   # dependent name
//              ::= sr <type> <unqualified-name> <template-args>   # dependent template-id
//              ::= ds <expression> <expression>                   # expr.*expr
//              ::= sZ <template-param>                            # size of a parameter pack
//              ::= sZ <function-param>    # size of a function parameter pack
//              ::= u <source-name> <template-arg>* E # vendor extended expression
//              ::= <expr-primary>
// <expr-primary> ::= L <type> <value number> E    # integer literal
//                ::= L <type> <value float> E     # floating literal
//                ::= L <type> <string type> E     # string literal
//                ::= L <nullptr type> E           # nullptr literal "LDnE"
//                ::= L <pointer type> 0 E         # null pointer template argument
//                ::= L <type> <real-part float> _ <imag-part float> E    # complex floating point literal (C99); not used by clang
//                ::= L <mangled-name> E           # external name
QualType ImplicitlyConvertedToType;

// A top-level expression that's not <expr-primary> needs to be wrapped in
// X...E in a template arg.
bool IsPrimaryExpr = true;
auto NotPrimaryExpr = [&] {
  if (AsTemplateArg && IsPrimaryExpr)
    Out << 'X';
  IsPrimaryExpr = false;
};

auto MangleDeclRefExpr = [&](const NamedDecl *D) {
  switch (D->getKind()) {
  default:
    //  <expr-primary> ::= L <mangled-name> E # external name
    Out << 'L';
    mangle(D);
    Out << 'E';
    break;

  case Decl::ParmVar:
    NotPrimaryExpr();
    mangleFunctionParam(cast<ParmVarDecl>(D));
    break;

  case Decl::EnumConstant: {
    // <expr-primary>
    const EnumConstantDecl *ED = cast<EnumConstantDecl>(D);
    mangleIntegerLiteral(ED->getType(), ED->getInitVal());
    break;
  }

  case Decl::NonTypeTemplateParm:
    NotPrimaryExpr();
    const NonTypeTemplateParmDecl *PD = cast<NonTypeTemplateParmDecl>(D);
    mangleTemplateParameter(PD->getDepth(), PD->getIndex());
    break;
  }
};

// 'goto recurse' is used when handling a simple "unwrapping" node which
// produces no output, where ImplicitlyConvertedToType and AsTemplateArg need
// to be preserved.
4331recurse:
switch (E->getStmtClass()) {
case Expr::NoStmtClass:
4334#define ABSTRACT_STMT(Type)
4335#define EXPR(Type, Base)
4336#define STMT(Type, Base) \
case Expr::Type##Class:
4338#include "clang/AST/StmtNodes.inc"
  // fallthrough

// These all can only appear in local or variable-initialization
// contexts and so should never appear in a mangling.
case Expr::AddrLabelExprClass:
case Expr::DesignatedInitUpdateExprClass:
case Expr::ImplicitValueInitExprClass:
case Expr::ArrayInitLoopExprClass:
case Expr::ArrayInitIndexExprClass:
case Expr::NoInitExprClass:
case Expr::ParenListExprClass:
case Expr::MSPropertyRefExprClass:
case Expr::MSPropertySubscriptExprClass:
case Expr::TypoExprClass: // This should no longer exist in the AST by now.
case Expr::RecoveryExprClass:
case Expr::OMPArraySectionExprClass:
case Expr::OMPArrayShapingExprClass:
case Expr::OMPIteratorExprClass:
case Expr::CXXInheritedCtorInitExprClass:
case Expr::CXXParenListInitExprClass:
  llvm_unreachable("unexpected statement kind")::llvm::llvm_unreachable_internal("unexpected statement kind"
, "clang/lib/AST/ItaniumMangle.cpp", 4359);

case Expr::ConstantExprClass:
  E = cast<ConstantExpr>(E)->getSubExpr();
  goto recurse;

// FIXME: invent manglings for all these.
case Expr::BlockExprClass:
case Expr::ChooseExprClass:
case Expr::CompoundLiteralExprClass:
case Expr::ExtVectorElementExprClass:
case Expr::GenericSelectionExprClass:
case Expr::ObjCEncodeExprClass:
case Expr::ObjCIsaExprClass:
case Expr::ObjCIvarRefExprClass:
case Expr::ObjCMessageExprClass:
case Expr::ObjCPropertyRefExprClass:
case Expr::ObjCProtocolExprClass:
case Expr::ObjCSelectorExprClass:
case Expr::ObjCStringLiteralClass:
case Expr::ObjCBoxedExprClass:
case Expr::ObjCArrayLiteralClass:
case Expr::ObjCDictionaryLiteralClass:
case Expr::ObjCSubscriptRefExprClass:
case Expr::ObjCIndirectCopyRestoreExprClass:
case Expr::ObjCAvailabilityCheckExprClass:
case Expr::OffsetOfExprClass:
case Expr::PredefinedExprClass:
case Expr::ShuffleVectorExprClass:
case Expr::ConvertVectorExprClass:
case Expr::StmtExprClass:
case Expr::TypeTraitExprClass:
case Expr::RequiresExprClass:
case Expr::ArrayTypeTraitExprClass:
case Expr::ExpressionTraitExprClass:
case Expr::VAArgExprClass:
case Expr::CUDAKernelCallExprClass:
case Expr::AsTypeExprClass:
case Expr::PseudoObjectExprClass:
case Expr::AtomicExprClass:
case Expr::SourceLocExprClass:
case Expr::BuiltinBitCastExprClass:
{
  NotPrimaryExpr();
  if (!NullOut) {
    // As bad as this diagnostic is, it's better than crashing.
    DiagnosticsEngine &Diags = Context.getDiags();
    unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
                                     "cannot yet mangle expression type %0");
    Diags.Report(E->getExprLoc(), DiagID)
      << E->getStmtClassName() << E->getSourceRange();
    return;
  }
  break;
}

case Expr::CXXUuidofExprClass: {
  NotPrimaryExpr();
  const CXXUuidofExpr *UE = cast<CXXUuidofExpr>(E);
  // As of clang 12, uuidof uses the vendor extended expression
  // mangling. Previously, it used a special-cased nonstandard extension.
  if (Context.getASTContext().getLangOpts().getClangABICompat() >
      LangOptions::ClangABI::Ver11) {
    Out << "u8__uuidof";
    if (UE->isTypeOperand())
      mangleType(UE->getTypeOperand(Context.getASTContext()));
    else
      mangleTemplateArgExpr(UE->getExprOperand());
    Out << 'E';
  } else {
    if (UE->isTypeOperand()) {
      QualType UuidT = UE->getTypeOperand(Context.getASTContext());
      Out << "u8__uuidoft";
      mangleType(UuidT);
    } else {
      Expr *UuidExp = UE->getExprOperand();
      Out << "u8__uuidofz";
      mangleExpression(UuidExp);
    }
  }
  break;
}

// Even gcc-4.5 doesn't mangle this.
case Expr::BinaryConditionalOperatorClass: {
  NotPrimaryExpr();
  DiagnosticsEngine &Diags = Context.getDiags();
  unsigned DiagID =
    Diags.getCustomDiagID(DiagnosticsEngine::Error,
              "?: operator with omitted middle operand cannot be mangled");
  Diags.Report(E->getExprLoc(), DiagID)
    << E->getStmtClassName() << E->getSourceRange();
  return;
}

// These are used for internal purposes and cannot be meaningfully mangled.
case Expr::OpaqueValueExprClass:
  llvm_unreachable("cannot mangle opaque value; mangling wrong thing?")::llvm::llvm_unreachable_internal("cannot mangle opaque value; mangling wrong thing?"
, "clang/lib/AST/ItaniumMangle.cpp", 4456);

case Expr::InitListExprClass: {
  NotPrimaryExpr();
  Out << "il";
  mangleInitListElements(cast<InitListExpr>(E));
  Out << "E";
  break;
}

case Expr::DesignatedInitExprClass: {
  NotPrimaryExpr();
  auto *DIE = cast<DesignatedInitExpr>(E);
  for (const auto &Designator : DIE->designators()) {
    if (Designator.isFieldDesignator()) {
      Out << "di";
      mangleSourceName(Designator.getFieldName());
    } else if (Designator.isArrayDesignator()) {
      Out << "dx";
      mangleExpression(DIE->getArrayIndex(Designator));
    } else {
      assert(Designator.isArrayRangeDesignator() &&(static_cast <bool> (Designator.isArrayRangeDesignator(
) && "unknown designator kind") ? void (0) : __assert_fail
 ("Designator.isArrayRangeDesignator() && \"unknown designator kind\""
, "clang/lib/AST/ItaniumMangle.cpp", 4478, __extension__ __PRETTY_FUNCTION__
))
             "unknown designator kind")(static_cast <bool> (Designator.isArrayRangeDesignator(
) && "unknown designator kind") ? void (0) : __assert_fail
 ("Designator.isArrayRangeDesignator() && \"unknown designator kind\""
, "clang/lib/AST/ItaniumMangle.cpp", 4478, __extension__ __PRETTY_FUNCTION__
));
      Out << "dX";
      mangleExpression(DIE->getArrayRangeStart(Designator));
      mangleExpression(DIE->getArrayRangeEnd(Designator));
    }
  }
  mangleExpression(DIE->getInit());
  break;
}

case Expr::CXXDefaultArgExprClass:
  E = cast<CXXDefaultArgExpr>(E)->getExpr();
  goto recurse;

case Expr::CXXDefaultInitExprClass:
  E = cast<CXXDefaultInitExpr>(E)->getExpr();
  goto recurse;

case Expr::CXXStdInitializerListExprClass:
  E = cast<CXXStdInitializerListExpr>(E)->getSubExpr();
  goto recurse;

case Expr::SubstNonTypeTemplateParmExprClass:
  E = cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement();
  goto recurse;

case Expr::UserDefinedLiteralClass:
  // We follow g++'s approach of mangling a UDL as a call to the literal
  // operator.
case Expr::CXXMemberCallExprClass: // fallthrough
case Expr::CallExprClass: {
  NotPrimaryExpr();
  const CallExpr *CE = cast<CallExpr>(E);

  // <expression> ::= cp <simple-id> <expression>* E
  // We use this mangling only when the call would use ADL except
  // for being parenthesized.  Per discussion with David
  // Vandervoorde, 2011.04.25.
  if (isParenthesizedADLCallee(CE)) {
    Out << "cp";
    // The callee here is a parenthesized UnresolvedLookupExpr with
    // no qualifier and should always get mangled as a <simple-id>
    // anyway.

  // <expression> ::= cl <expression>* E
  } else {
    Out << "cl";
  }

  unsigned CallArity = CE->getNumArgs();
  for (const Expr *Arg : CE->arguments())
    if (isa<PackExpansionExpr>(Arg))
      CallArity = UnknownArity;

  mangleExpression(CE->getCallee(), CallArity);
  for (const Expr *Arg : CE->arguments())
    mangleExpression(Arg);
  Out << 'E';
  break;
}

case Expr::CXXNewExprClass: {
  NotPrimaryExpr();
  const CXXNewExpr *New = cast<CXXNewExpr>(E);
  if (New->isGlobalNew()) Out << "gs";
  Out << (New->isArray() ? "na" : "nw");
  for (CXXNewExpr::const_arg_iterator I = New->placement_arg_begin(),
         E = New->placement_arg_end(); I != E; ++I)
    mangleExpression(*I);
  Out << '_';
  mangleType(New->getAllocatedType());
  if (New->hasInitializer()) {
    if (New->getInitializationStyle() == CXXNewExpr::ListInit)
      Out << "il";
    else
      Out << "pi";
    const Expr *Init = New->getInitializer();
    if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init)) {
      // Directly inline the initializers.
      for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
                                                E = CCE->arg_end();
           I != E; ++I)
        mangleExpression(*I);
    } else if (const ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init)) {
      for (unsigned i = 0, e = PLE->getNumExprs(); i != e; ++i)
        mangleExpression(PLE->getExpr(i));
    } else if (New->getInitializationStyle() == CXXNewExpr::ListInit &&
               isa<InitListExpr>(Init)) {
      // Only take InitListExprs apart for list-initialization.
      mangleInitListElements(cast<InitListExpr>(Init));
    } else
      mangleExpression(Init);
  }
  Out << 'E';
  break;
}

case Expr::CXXPseudoDestructorExprClass: {
  NotPrimaryExpr();
  const auto *PDE = cast<CXXPseudoDestructorExpr>(E);
  if (const Expr *Base = PDE->getBase())
    mangleMemberExprBase(Base, PDE->isArrow());
  NestedNameSpecifier *Qualifier = PDE->getQualifier();
  if (TypeSourceInfo *ScopeInfo = PDE->getScopeTypeInfo()) {
    if (Qualifier) {
      mangleUnresolvedPrefix(Qualifier,
                             /*recursive=*/true);
      mangleUnresolvedTypeOrSimpleId(ScopeInfo->getType());
      Out << 'E';
    } else {
      Out << "sr";
      if (!mangleUnresolvedTypeOrSimpleId(ScopeInfo->getType()))
        Out << 'E';
    }
  } else if (Qualifier) {
    mangleUnresolvedPrefix(Qualifier);
  }
  // <base-unresolved-name> ::= dn <destructor-name>
  Out << "dn";
  QualType DestroyedType = PDE->getDestroyedType();
  mangleUnresolvedTypeOrSimpleId(DestroyedType);
  break;
}

case Expr::MemberExprClass: {
  NotPrimaryExpr();
  const MemberExpr *ME = cast<MemberExpr>(E);
  mangleMemberExpr(ME->getBase(), ME->isArrow(),
                   ME->getQualifier(), nullptr,
                   ME->getMemberDecl()->getDeclName(),
                   ME->getTemplateArgs(), ME->getNumTemplateArgs(),
                   Arity);
  break;
}

case Expr::UnresolvedMemberExprClass: {
  NotPrimaryExpr();
  const UnresolvedMemberExpr *ME = cast<UnresolvedMemberExpr>(E);
  mangleMemberExpr(ME->isImplicitAccess() ? nullptr : ME->getBase(),
                   ME->isArrow(), ME->getQualifier(), nullptr,
                   ME->getMemberName(),
                   ME->getTemplateArgs(), ME->getNumTemplateArgs(),
                   Arity);
  break;
}

case Expr::CXXDependentScopeMemberExprClass: {
  NotPrimaryExpr();
  const CXXDependentScopeMemberExpr *ME
    = cast<CXXDependentScopeMemberExpr>(E);
  mangleMemberExpr(ME->isImplicitAccess() ? nullptr : ME->getBase(),
                   ME->isArrow(), ME->getQualifier(),
                   ME->getFirstQualifierFoundInScope(),
                   ME->getMember(),
                   ME->getTemplateArgs(), ME->getNumTemplateArgs(),
                   Arity);
  break;
}

case Expr::UnresolvedLookupExprClass: {
  NotPrimaryExpr();
  const UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(E);
  mangleUnresolvedName(ULE->getQualifier(), ULE->getName(),
                       ULE->getTemplateArgs(), ULE->getNumTemplateArgs(),
                       Arity);
  break;
}

case Expr::CXXUnresolvedConstructExprClass: {
  NotPrimaryExpr();
  const CXXUnresolvedConstructExpr *CE = cast<CXXUnresolvedConstructExpr>(E);
  unsigned N = CE->getNumArgs();

  if (CE->isListInitialization()) {
    assert(N == 1 && "unexpected form for list initialization")(static_cast <bool> (N == 1 && "unexpected form for list initialization"
) ? void (0) : __assert_fail ("N == 1 && \"unexpected form for list initialization\""
, "clang/lib/AST/ItaniumMangle.cpp", 4652, __extension__ __PRETTY_FUNCTION__
));
    auto *IL = cast<InitListExpr>(CE->getArg(0));
    Out << "tl";
    mangleType(CE->getType());
    mangleInitListElements(IL);
    Out << "E";
    break;
  }

  Out << "cv";
  mangleType(CE->getType());
  if (N != 1) Out << '_';
  for (unsigned I = 0; I != N; ++I) mangleExpression(CE->getArg(I));
  if (N != 1) Out << 'E';
  break;
}

case Expr::CXXConstructExprClass: {
  // An implicit cast is silent, thus may contain <expr-primary>.
  const auto *CE = cast<CXXConstructExpr>(E);
  if (!CE->isListInitialization() || CE->isStdInitListInitialization()) {
    assert((static_cast <bool> (CE->getNumArgs() >= 1 &&
 (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE
->getArg(1))) && "implicit CXXConstructExpr must have one argument"
) ? void (0) : __assert_fail ("CE->getNumArgs() >= 1 && (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE->getArg(1))) && \"implicit CXXConstructExpr must have one argument\""
, "clang/lib/AST/ItaniumMangle.cpp", 4676, __extension__ __PRETTY_FUNCTION__
))
        CE->getNumArgs() >= 1 &&(static_cast <bool> (CE->getNumArgs() >= 1 &&
 (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE
->getArg(1))) && "implicit CXXConstructExpr must have one argument"
) ? void (0) : __assert_fail ("CE->getNumArgs() >= 1 && (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE->getArg(1))) && \"implicit CXXConstructExpr must have one argument\""
, "clang/lib/AST/ItaniumMangle.cpp", 4676, __extension__ __PRETTY_FUNCTION__
))
        (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE->getArg(1))) &&(static_cast <bool> (CE->getNumArgs() >= 1 &&
 (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE
->getArg(1))) && "implicit CXXConstructExpr must have one argument"
) ? void (0) : __assert_fail ("CE->getNumArgs() >= 1 && (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE->getArg(1))) && \"implicit CXXConstructExpr must have one argument\""
, "clang/lib/AST/ItaniumMangle.cpp", 4676, __extension__ __PRETTY_FUNCTION__
))
        "implicit CXXConstructExpr must have one argument")(static_cast <bool> (CE->getNumArgs() >= 1 &&
 (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE
->getArg(1))) && "implicit CXXConstructExpr must have one argument"
) ? void (0) : __assert_fail ("CE->getNumArgs() >= 1 && (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE->getArg(1))) && \"implicit CXXConstructExpr must have one argument\""
, "clang/lib/AST/ItaniumMangle.cpp", 4676, __extension__ __PRETTY_FUNCTION__
));
    E = cast<CXXConstructExpr>(E)->getArg(0);
    goto recurse;
  }
  NotPrimaryExpr();
  Out << "il";
  for (auto *E : CE->arguments())
    mangleExpression(E);
  Out << "E";
  break;
}

case Expr::CXXTemporaryObjectExprClass: {
  NotPrimaryExpr();
  const auto *CE = cast<CXXTemporaryObjectExpr>(E);
  unsigned N = CE->getNumArgs();
  bool List = CE->isListInitialization();

  if (List)
    Out << "tl";
  else
    Out << "cv";
  mangleType(CE->getType());
  if (!List && N != 1)
    Out << '_';
  if (CE->isStdInitListInitialization()) {
    // We implicitly created a std::initializer_list<T> for the first argument
    // of a constructor of type U in an expression of the form U{a, b, c}.
    // Strip all the semantic gunk off the initializer list.
    auto *SILE =
        cast<CXXStdInitializerListExpr>(CE->getArg(0)->IgnoreImplicit());
    auto *ILE = cast<InitListExpr>(SILE->getSubExpr()->IgnoreImplicit());
    mangleInitListElements(ILE);
  } else {
    for (auto *E : CE->arguments())
      mangleExpression(E);
  }
  if (List || N != 1)
    Out << 'E';
  break;
}

case Expr::CXXScalarValueInitExprClass:
  NotPrimaryExpr();
  Out << "cv";
  mangleType(E->getType());
  Out << "_E";
  break;

case Expr::CXXNoexceptExprClass:
  NotPrimaryExpr();
  Out << "nx";
  mangleExpression(cast<CXXNoexceptExpr>(E)->getOperand());
  break;

case Expr::UnaryExprOrTypeTraitExprClass: {
  // Non-instantiation-dependent traits are an <expr-primary> integer literal.
  const UnaryExprOrTypeTraitExpr *SAE = cast<UnaryExprOrTypeTraitExpr>(E);

  if (!SAE->isInstantiationDependent()) {
    // Itanium C++ ABI:
    //   If the operand of a sizeof or alignof operator is not
    //   instantiation-dependent it is encoded as an integer literal
    //   reflecting the result of the operator.
    //
    //   If the result of the operator is implicitly converted to a known
    //   integer type, that type is used for the literal; otherwise, the type
    //   of std::size_t or std::ptrdiff_t is used.
    QualType T = (ImplicitlyConvertedToType.isNull() ||
                  !ImplicitlyConvertedToType->isIntegerType())? SAE->getType()
                                                  : ImplicitlyConvertedToType;
    llvm::APSInt V = SAE->EvaluateKnownConstInt(Context.getASTContext());
    mangleIntegerLiteral(T, V);
    break;
  }

  NotPrimaryExpr(); // But otherwise, they are not.

  auto MangleAlignofSizeofArg = [&] {
    if (SAE->isArgumentType()) {
      Out << 't';
      mangleType(SAE->getArgumentType());
    } else {
      Out << 'z';
      mangleExpression(SAE->getArgumentExpr());
    }
  };

  switch(SAE->getKind()) {
  case UETT_SizeOf:
    Out << 's';
    MangleAlignofSizeofArg();
    break;
  case UETT_PreferredAlignOf:
    // As of clang 12, we mangle __alignof__ differently than alignof. (They
    // have acted differently since Clang 8, but were previously mangled the
    // same.)
    if (Context.getASTContext().getLangOpts().getClangABICompat() >
        LangOptions::ClangABI::Ver11) {
      Out << "u11__alignof__";
      if (SAE->isArgumentType())
        mangleType(SAE->getArgumentType());
      else
        mangleTemplateArgExpr(SAE->getArgumentExpr());
      Out << 'E';
      break;
    }
    [[fallthrough]];
  case UETT_AlignOf:
    Out << 'a';
    MangleAlignofSizeofArg();
    break;
  case UETT_VecStep: {
    DiagnosticsEngine &Diags = Context.getDiags();
    unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
                                   "cannot yet mangle vec_step expression");
    Diags.Report(DiagID);
    return;
  }
  case UETT_OpenMPRequiredSimdAlign: {
    DiagnosticsEngine &Diags = Context.getDiags();
    unsigned DiagID = Diags.getCustomDiagID(
        DiagnosticsEngine::Error,
        "cannot yet mangle __builtin_omp_required_simd_align expression");
    Diags.Report(DiagID);
    return;
  }
  }
  break;
}

case Expr::CXXThrowExprClass: {
  NotPrimaryExpr();
  const CXXThrowExpr *TE = cast<CXXThrowExpr>(E);
  //  <expression> ::= tw <expression>  # throw expression
  //               ::= tr               # rethrow
  if (TE->getSubExpr()) {
    Out << "tw";
    mangleExpression(TE->getSubExpr());
  } else {
    Out << "tr";
  }
  break;
}

case Expr::CXXTypeidExprClass: {
  NotPrimaryExpr();
  const CXXTypeidExpr *TIE = cast<CXXTypeidExpr>(E);
  //  <expression> ::= ti <type>        # typeid (type)
  //               ::= te <expression>  # typeid (expression)
  if (TIE->isTypeOperand()) {
    Out << "ti";
    mangleType(TIE->getTypeOperand(Context.getASTContext()));
  } else {
    Out << "te";
    mangleExpression(TIE->getExprOperand());
  }
  break;
}

case Expr::CXXDeleteExprClass: {
  NotPrimaryExpr();
  const CXXDeleteExpr *DE = cast<CXXDeleteExpr>(E);
  //  <expression> ::= [gs] dl <expression>  # [::] delete expr
  //               ::= [gs] da <expression>  # [::] delete [] expr
  if (DE->isGlobalDelete()) Out << "gs";
  Out << (DE->isArrayForm() ? "da" : "dl");
  mangleExpression(DE->getArgument());
  break;
}

case Expr::UnaryOperatorClass: {
  NotPrimaryExpr();
  const UnaryOperator *UO = cast<UnaryOperator>(E);
  mangleOperatorName(UnaryOperator::getOverloadedOperator(UO->getOpcode()),
                     /*Arity=*/1);
  mangleExpression(UO->getSubExpr());
  break;
}

case Expr::ArraySubscriptExprClass: {
  NotPrimaryExpr();
  const ArraySubscriptExpr *AE = cast<ArraySubscriptExpr>(E);

  // Array subscript is treated as a syntactically weird form of
  // binary operator.
  Out << "ix";
  mangleExpression(AE->getLHS());
  mangleExpression(AE->getRHS());
  break;
}

case Expr::MatrixSubscriptExprClass: {
  NotPrimaryExpr();
  const MatrixSubscriptExpr *ME = cast<MatrixSubscriptExpr>(E);
  Out << "ixix";
  mangleExpression(ME->getBase());
  mangleExpression(ME->getRowIdx());
  mangleExpression(ME->getColumnIdx());
  break;
}

case Expr::CompoundAssignOperatorClass: // fallthrough
case Expr::BinaryOperatorClass: {
  NotPrimaryExpr();
  const BinaryOperator *BO = cast<BinaryOperator>(E);
  if (BO->getOpcode() == BO_PtrMemD)
    Out << "ds";
  else
    mangleOperatorName(BinaryOperator::getOverloadedOperator(BO->getOpcode()),
                       /*Arity=*/2);
  mangleExpression(BO->getLHS());
  mangleExpression(BO->getRHS());
  break;
}

case Expr::CXXRewrittenBinaryOperatorClass: {
  NotPrimaryExpr();
  // The mangled form represents the original syntax.
  CXXRewrittenBinaryOperator::DecomposedForm Decomposed =
      cast<CXXRewrittenBinaryOperator>(E)->getDecomposedForm();
  mangleOperatorName(BinaryOperator::getOverloadedOperator(Decomposed.Opcode),
                     /*Arity=*/2);
  mangleExpression(Decomposed.LHS);
  mangleExpression(Decomposed.RHS);
  break;
}

case Expr::ConditionalOperatorClass: {
  NotPrimaryExpr();
  const ConditionalOperator *CO = cast<ConditionalOperator>(E);
  mangleOperatorName(OO_Conditional, /*Arity=*/3);
  mangleExpression(CO->getCond());
  mangleExpression(CO->getLHS(), Arity);
  mangleExpression(CO->getRHS(), Arity);
  break;
}

case Expr::ImplicitCastExprClass: {
  ImplicitlyConvertedToType = E->getType();
  E = cast<ImplicitCastExpr>(E)->getSubExpr();
  goto recurse;
}

case Expr::ObjCBridgedCastExprClass: {
  NotPrimaryExpr();
  // Mangle ownership casts as a vendor extended operator __bridge,
  // __bridge_transfer, or __bridge_retain.
  StringRef Kind = cast<ObjCBridgedCastExpr>(E)->getBridgeKindName();
  Out << "v1U" << Kind.size() << Kind;
  mangleCastExpression(E, "cv");
  break;
}

case Expr::CStyleCastExprClass:
  NotPrimaryExpr();
  mangleCastExpression(E, "cv");
  break;

case Expr::CXXFunctionalCastExprClass: {
  NotPrimaryExpr();
  auto *Sub = cast<ExplicitCastExpr>(E)->getSubExpr()->IgnoreImplicit();
  // FIXME: Add isImplicit to CXXConstructExpr.
  if (auto *CCE = dyn_cast<CXXConstructExpr>(Sub))
    if (CCE->getParenOrBraceRange().isInvalid())
      Sub = CCE->getArg(0)->IgnoreImplicit();
  if (auto *StdInitList = dyn_cast<CXXStdInitializerListExpr>(Sub))
    Sub = StdInitList->getSubExpr()->IgnoreImplicit();
  if (auto *IL = dyn_cast<InitListExpr>(Sub)) {
    Out << "tl";
    mangleType(E->getType());
    mangleInitListElements(IL);
    Out << "E";
  } else {
    mangleCastExpression(E, "cv");
  }
  break;
}

case Expr::CXXStaticCastExprClass:
  NotPrimaryExpr();
  mangleCastExpression(E, "sc");
  break;
case Expr::CXXDynamicCastExprClass:
  NotPrimaryExpr();
  mangleCastExpression(E, "dc");
  break;
case Expr::CXXReinterpretCastExprClass:
  NotPrimaryExpr();
  mangleCastExpression(E, "rc");
  break;
case Expr::CXXConstCastExprClass:
  NotPrimaryExpr();
  mangleCastExpression(E, "cc");
  break;
case Expr::CXXAddrspaceCastExprClass:
  NotPrimaryExpr();
  mangleCastExpression(E, "ac");
  break;

case Expr::CXXOperatorCallExprClass: {
  NotPrimaryExpr();
  const CXXOperatorCallExpr *CE = cast<CXXOperatorCallExpr>(E);
  unsigned NumArgs = CE->getNumArgs();
  // A CXXOperatorCallExpr for OO_Arrow models only semantics, not syntax
  // (the enclosing MemberExpr covers the syntactic portion).
  if (CE->getOperator() != OO_Arrow)
    mangleOperatorName(CE->getOperator(), /*Arity=*/NumArgs);
  // Mangle the arguments.
  for (unsigned i = 0; i != NumArgs; ++i)
    mangleExpression(CE->getArg(i));
  break;
}

case Expr::ParenExprClass:
  E = cast<ParenExpr>(E)->getSubExpr();
  goto recurse;

case Expr::ConceptSpecializationExprClass: {
  //  <expr-primary> ::= L <mangled-name> E # external name
  Out << "L_Z";
  auto *CSE = cast<ConceptSpecializationExpr>(E);
  mangleTemplateName(CSE->getNamedConcept(), CSE->getTemplateArguments());
  Out << 'E';
  break;
}

case Expr::DeclRefExprClass:
  // MangleDeclRefExpr helper handles primary-vs-nonprimary
  MangleDeclRefExpr(cast<DeclRefExpr>(E)->getDecl());
  break;

case Expr::SubstNonTypeTemplateParmPackExprClass:
  NotPrimaryExpr();
  // FIXME: not clear how to mangle this!
  // template <unsigned N...> class A {
  //   template <class U...> void foo(U (&x)[N]...);
  // };
  Out << "_SUBSTPACK_";
  break;

case Expr::FunctionParmPackExprClass: {
  NotPrimaryExpr();
  // FIXME: not clear how to mangle this!
  const FunctionParmPackExpr *FPPE = cast<FunctionParmPackExpr>(E);
  Out << "v110_SUBSTPACK";
  MangleDeclRefExpr(FPPE->getParameterPack());
  break;
}

case Expr::DependentScopeDeclRefExprClass: {
  NotPrimaryExpr();
  const DependentScopeDeclRefExpr *DRE = cast<DependentScopeDeclRefExpr>(E);
  mangleUnresolvedName(DRE->getQualifier(), DRE->getDeclName(),
                       DRE->getTemplateArgs(), DRE->getNumTemplateArgs(),
                       Arity);
  break;
}

case Expr::CXXBindTemporaryExprClass:
  E = cast<CXXBindTemporaryExpr>(E)->getSubExpr();
  goto recurse;

case Expr::ExprWithCleanupsClass:
  E = cast<ExprWithCleanups>(E)->getSubExpr();
  goto recurse;

case Expr::FloatingLiteralClass: {
  // <expr-primary>
  const FloatingLiteral *FL = cast<FloatingLiteral>(E);
  mangleFloatLiteral(FL->getType(), FL->getValue());
  break;
}

case Expr::FixedPointLiteralClass:
  // Currently unimplemented -- might be <expr-primary> in future?
  mangleFixedPointLiteral();
  break;

case Expr::CharacterLiteralClass:
  // <expr-primary>
  Out << 'L';
  mangleType(E->getType());
  Out << cast<CharacterLiteral>(E)->getValue();
  Out << 'E';
  break;

// FIXME. __objc_yes/__objc_no are mangled same as true/false
case Expr::ObjCBoolLiteralExprClass:
  // <expr-primary>
  Out << "Lb";
  Out << (cast<ObjCBoolLiteralExpr>(E)->getValue() ? '1' : '0');
  Out << 'E';
  break;

case Expr::CXXBoolLiteralExprClass:
  // <expr-primary>
  Out << "Lb";
  Out << (cast<CXXBoolLiteralExpr>(E)->getValue() ? '1' : '0');
  Out << 'E';
  break;

case Expr::IntegerLiteralClass: {
  // <expr-primary>
  llvm::APSInt Value(cast<IntegerLiteral>(E)->getValue());
  if (E->getType()->isSignedIntegerType())
    Value.setIsSigned(true);
  mangleIntegerLiteral(E->getType(), Value);
  break;
}

case Expr::ImaginaryLiteralClass: {
  // <expr-primary>
  const ImaginaryLiteral *IE = cast<ImaginaryLiteral>(E);
  // Mangle as if a complex literal.
  // Proposal from David Vandevoorde, 2010.06.30.
  Out << 'L';
  mangleType(E->getType());
  if (const FloatingLiteral *Imag =
        dyn_cast<FloatingLiteral>(IE->getSubExpr())) {
    // Mangle a floating-point zero of the appropriate type.
    mangleFloat(llvm::APFloat(Imag->getValue().getSemantics()));
    Out << '_';
    mangleFloat(Imag->getValue());
  } else {
    Out << "0_";
    llvm::APSInt Value(cast<IntegerLiteral>(IE->getSubExpr())->getValue());
    if (IE->getSubExpr()->getType()->isSignedIntegerType())
      Value.setIsSigned(true);
    mangleNumber(Value);
  }
  Out << 'E';
  break;
}

case Expr::StringLiteralClass: {
  // <expr-primary>
  // Revised proposal from David Vandervoorde, 2010.07.15.
  Out << 'L';
  assert(isa<ConstantArrayType>(E->getType()))(static_cast <bool> (isa<ConstantArrayType>(E->
getType())) ? void (0) : __assert_fail ("isa<ConstantArrayType>(E->getType())"
, "clang/lib/AST/ItaniumMangle.cpp", 5115, __extension__ __PRETTY_FUNCTION__
));
  mangleType(E->getType());
  Out << 'E';
  break;
}

case Expr::GNUNullExprClass:
  // <expr-primary>
  // Mangle as if an integer literal 0.
  mangleIntegerLiteral(E->getType(), llvm::APSInt(32));
  break;

case Expr::CXXNullPtrLiteralExprClass: {
  // <expr-primary>
  Out << "LDnE";
  break;
}

case Expr::LambdaExprClass: {
  // A lambda-expression can't appear in the signature of an
  // externally-visible declaration, so there's no standard mangling for
  // this, but mangling as a literal of the closure type seems reasonable.
  Out << "L";
  mangleType(Context.getASTContext().getRecordType(cast<LambdaExpr>(E)->getLambdaClass()));
  Out << "E";
  break;
}

case Expr::PackExpansionExprClass:
  NotPrimaryExpr();
  Out << "sp";
  mangleExpression(cast<PackExpansionExpr>(E)->getPattern());
  break;

case Expr::SizeOfPackExprClass: {
  NotPrimaryExpr();
  auto *SPE = cast<SizeOfPackExpr>(E);
  if (SPE->isPartiallySubstituted()) {
    Out << "sP";
    for (const auto &A : SPE->getPartialArguments())
      mangleTemplateArg(A, false);
    Out << "E";
    break;
  }

  Out << "sZ";
  const NamedDecl *Pack = SPE->getPack();
  if (const TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Pack))
    mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
  else if (const NonTypeTemplateParmDecl *NTTP
              = dyn_cast<NonTypeTemplateParmDecl>(Pack))
    mangleTemplateParameter(NTTP->getDepth(), NTTP->getIndex());
  else if (const TemplateTemplateParmDecl *TempTP
                                  = dyn_cast<TemplateTemplateParmDecl>(Pack))
    mangleTemplateParameter(TempTP->getDepth(), TempTP->getIndex());
  else
    mangleFunctionParam(cast<ParmVarDecl>(Pack));
  break;
}

case Expr::MaterializeTemporaryExprClass:
  E = cast<MaterializeTemporaryExpr>(E)->getSubExpr();
  goto recurse;

case Expr::CXXFoldExprClass: {
  NotPrimaryExpr();
  auto *FE = cast<CXXFoldExpr>(E);
  if (FE->isLeftFold())
    Out << (FE->getInit() ? "fL" : "fl");
  else
    Out << (FE->getInit() ? "fR" : "fr");

  if (FE->getOperator() == BO_PtrMemD)
    Out << "ds";
  else
    mangleOperatorName(
        BinaryOperator::getOverloadedOperator(FE->getOperator()),
        /*Arity=*/2);

  if (FE->getLHS())
    mangleExpression(FE->getLHS());
  if (FE->getRHS())
    mangleExpression(FE->getRHS());
  break;
}

case Expr::CXXThisExprClass:
  NotPrimaryExpr();
  Out << "fpT";
  break;

case Expr::CoawaitExprClass:
  // FIXME: Propose a non-vendor mangling.
  NotPrimaryExpr();
  Out << "v18co_await";
  mangleExpression(cast<CoawaitExpr>(E)->getOperand());
  break;

case Expr::DependentCoawaitExprClass:
  // FIXME: Propose a non-vendor mangling.
  NotPrimaryExpr();
  Out << "v18co_await";
  mangleExpression(cast<DependentCoawaitExpr>(E)->getOperand());
  break;

case Expr::CoyieldExprClass:
  // FIXME: Propose a non-vendor mangling.
  NotPrimaryExpr();
  Out << "v18co_yield";
  mangleExpression(cast<CoawaitExpr>(E)->getOperand());
  break;
case Expr::SYCLUniqueStableNameExprClass: {
  const auto *USN = cast<SYCLUniqueStableNameExpr>(E);
  NotPrimaryExpr();

  Out << "u33__builtin_sycl_unique_stable_name";
  mangleType(USN->getTypeSourceInfo()->getType());

  Out << "E";
  break;
}
}

if (AsTemplateArg && !IsPrimaryExpr)
  Out << 'E';
5240}

5242/// Mangle an expression which refers to a parameter variable.
5243///
5244/// <expression>     ::= <function-param>
5245/// <function-param> ::= fp <top-level CV-qualifiers> _      # L == 0, I == 0
5246/// <function-param> ::= fp <top-level CV-qualifiers>
5247///                      <parameter-2 non-negative number> _ # L == 0, I > 0
5248/// <function-param> ::= fL <L-1 non-negative number>
5249///                      p <top-level CV-qualifiers> _       # L > 0, I == 0
5250/// <function-param> ::= fL <L-1 non-negative number>
5251///                      p <top-level CV-qualifiers>
5252///                      <I-1 non-negative number> _         # L > 0, I > 0
5253///
5254/// L is the nesting depth of the parameter, defined as 1 if the
5255/// parameter comes from the innermost function prototype scope
5256/// enclosing the current context, 2 if from the next enclosing
5257/// function prototype scope, and so on, with one special case: if
5258/// we've processed the full parameter clause for the innermost
5259/// function type, then L is one less.  This definition conveniently
5260/// makes it irrelevant whether a function's result type was written
5261/// trailing or leading, but is otherwise overly complicated; the
5262/// numbering was first designed without considering references to
5263/// parameter in locations other than return types, and then the
5264/// mangling had to be generalized without changing the existing
5265/// manglings.
5266///
5267/// I is the zero-based index of the parameter within its parameter
5268/// declaration clause.  Note that the original ABI document describes
5269/// this using 1-based ordinals.
5270void CXXNameMangler::mangleFunctionParam(const ParmVarDecl *parm) {
unsigned parmDepth = parm->getFunctionScopeDepth();
unsigned parmIndex = parm->getFunctionScopeIndex();

// Compute 'L'.
// parmDepth does not include the declaring function prototype.
// FunctionTypeDepth does account for that.
assert(parmDepth < FunctionTypeDepth.getDepth())(static_cast <bool> (parmDepth < FunctionTypeDepth.getDepth
()) ? void (0) : __assert_fail ("parmDepth < FunctionTypeDepth.getDepth()"
, "clang/lib/AST/ItaniumMangle.cpp", 5277, __extension__ __PRETTY_FUNCTION__
));
unsigned nestingDepth = FunctionTypeDepth.getDepth() - parmDepth;
if (FunctionTypeDepth.isInResultType())
  nestingDepth--;

if (nestingDepth == 0) {
  Out << "fp";
} else {
  Out << "fL" << (nestingDepth - 1) << 'p';
}

// Top-level qualifiers.  We don't have to worry about arrays here,
// because parameters declared as arrays should already have been
// transformed to have pointer type. FIXME: apparently these don't
// get mangled if used as an rvalue of a known non-class type?
assert(!parm->getType()->isArrayType()(static_cast <bool> (!parm->getType()->isArrayType
() && "parameter's type is still an array type?") ? void
 (0) : __assert_fail ("!parm->getType()->isArrayType() && \"parameter's type is still an array type?\""
, "clang/lib/AST/ItaniumMangle.cpp", 5293, __extension__ __PRETTY_FUNCTION__
))
       && "parameter's type is still an array type?")(static_cast <bool> (!parm->getType()->isArrayType
() && "parameter's type is still an array type?") ? void
 (0) : __assert_fail ("!parm->getType()->isArrayType() && \"parameter's type is still an array type?\""
, "clang/lib/AST/ItaniumMangle.cpp", 5293, __extension__ __PRETTY_FUNCTION__
));

if (const DependentAddressSpaceType *DAST =
    dyn_cast<DependentAddressSpaceType>(parm->getType())) {
  mangleQualifiers(DAST->getPointeeType().getQualifiers(), DAST);
} else {
  mangleQualifiers(parm->getType().getQualifiers());
}

// Parameter index.
if (parmIndex != 0) {
  Out << (parmIndex - 1);
}
Out << '_';
5307}

5309void CXXNameMangler::mangleCXXCtorType(CXXCtorType T,
                                     const CXXRecordDecl *InheritedFrom) {
// <ctor-dtor-name> ::= C1  # complete object constructor
//                  ::= C2  # base object constructor
//                  ::= CI1 <type> # complete inheriting constructor
//                  ::= CI2 <type> # base inheriting constructor
//
// In addition, C5 is a comdat name with C1 and C2 in it.
Out << 'C';
if (InheritedFrom)
  Out << 'I';
switch (T) {
case Ctor_Complete:
  Out << '1';
  break;
case Ctor_Base:
  Out << '2';
  break;
case Ctor_Comdat:
  Out << '5';
  break;
case Ctor_DefaultClosure:
case Ctor_CopyingClosure:
  llvm_unreachable("closure constructors don't exist for the Itanium ABI!")::llvm::llvm_unreachable_internal("closure constructors don't exist for the Itanium ABI!"
, "clang/lib/AST/ItaniumMangle.cpp", 5332);
}
if (InheritedFrom)
  mangleName(InheritedFrom);
5336}

5338void CXXNameMangler::mangleCXXDtorType(CXXDtorType T) {
// <ctor-dtor-name> ::= D0  # deleting destructor
//                  ::= D1  # complete object destructor
//                  ::= D2  # base object destructor
//
// In addition, D5 is a comdat name with D1, D2 and, if virtual, D0 in it.
switch (T) {
case Dtor_Deleting:
  Out << "D0";
  break;
case Dtor_Complete:
  Out << "D1";
  break;
case Dtor_Base:
  Out << "D2";
  break;
case Dtor_Comdat:
  Out << "D5";
  break;
}
5358}

5360namespace {
5361// Helper to provide ancillary information on a template used to mangle its
5362// arguments.
5363struct TemplateArgManglingInfo {
TemplateDecl *ResolvedTemplate = nullptr;
bool SeenPackExpansionIntoNonPack = false;
const NamedDecl *UnresolvedExpandedPack = nullptr;

TemplateArgManglingInfo(TemplateName TN) {
  if (TemplateDecl *TD = TN.getAsTemplateDecl())
    ResolvedTemplate = TD;
}

/// Do we need to mangle template arguments with exactly correct types?
///
/// This should be called exactly once for each parameter / argument pair, in
/// order.
bool needExactType(unsigned ParamIdx, const TemplateArgument &Arg) {
  // We need correct types when the template-name is unresolved or when it
  // names a template that is able to be overloaded.
  if (!ResolvedTemplate || SeenPackExpansionIntoNonPack)
    return true;

  // Move to the next parameter.
  const NamedDecl *Param = UnresolvedExpandedPack;
  if (!Param) {
    assert(ParamIdx < ResolvedTemplate->getTemplateParameters()->size() &&(static_cast <bool> (ParamIdx < ResolvedTemplate->
getTemplateParameters()->size() && "no parameter for argument"
) ? void (0) : __assert_fail ("ParamIdx < ResolvedTemplate->getTemplateParameters()->size() && \"no parameter for argument\""
, "clang/lib/AST/ItaniumMangle.cpp", 5387, __extension__ __PRETTY_FUNCTION__
))
           "no parameter for argument")(static_cast <bool> (ParamIdx < ResolvedTemplate->
getTemplateParameters()->size() && "no parameter for argument"
) ? void (0) : __assert_fail ("ParamIdx < ResolvedTemplate->getTemplateParameters()->size() && \"no parameter for argument\""
, "clang/lib/AST/ItaniumMangle.cpp", 5387, __extension__ __PRETTY_FUNCTION__
));
    Param = ResolvedTemplate->getTemplateParameters()->getParam(ParamIdx);

    // If we reach an expanded parameter pack whose argument isn't in pack
    // form, that means Sema couldn't figure out which arguments belonged to
    // it, because it contains a pack expansion. Track the expanded pack for
    // all further template arguments until we hit that pack expansion.
    if (Param->isParameterPack() && Arg.getKind() != TemplateArgument::Pack) {
      assert(getExpandedPackSize(Param) &&(static_cast <bool> (getExpandedPackSize(Param) &&
 "failed to form pack argument for parameter pack") ? void (0
) : __assert_fail ("getExpandedPackSize(Param) && \"failed to form pack argument for parameter pack\""
, "clang/lib/AST/ItaniumMangle.cpp", 5396, __extension__ __PRETTY_FUNCTION__
))
             "failed to form pack argument for parameter pack")(static_cast <bool> (getExpandedPackSize(Param) &&
 "failed to form pack argument for parameter pack") ? void (0
) : __assert_fail ("getExpandedPackSize(Param) && \"failed to form pack argument for parameter pack\""
, "clang/lib/AST/ItaniumMangle.cpp", 5396, __extension__ __PRETTY_FUNCTION__
));
      UnresolvedExpandedPack = Param;
    }
  }

  // If we encounter a pack argument that is expanded into a non-pack
  // parameter, we can no longer track parameter / argument correspondence,
  // and need to use exact types from this point onwards.
  if (Arg.isPackExpansion() &&
      (!Param->isParameterPack() || UnresolvedExpandedPack)) {
    SeenPackExpansionIntoNonPack = true;
    return true;
  }

  // We need exact types for function template arguments because they might be
  // overloaded on template parameter type. As a special case, a member
  // function template of a generic lambda is not overloadable.
  if (auto *FTD = dyn_cast<FunctionTemplateDecl>(ResolvedTemplate)) {
    auto *RD = dyn_cast<CXXRecordDecl>(FTD->getDeclContext());
    if (!RD || !RD->isGenericLambda())
      return true;
  }

  // Otherwise, we only need a correct type if the parameter has a deduced
  // type.
  //
  // Note: for an expanded parameter pack, getType() returns the type prior
  // to expansion. We could ask for the expanded type with getExpansionType(),
  // but it doesn't matter because substitution and expansion don't affect
  // whether a deduced type appears in the type.
  auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param);
  return NTTP && NTTP->getType()->getContainedDeducedType();
}
5429};
5430}

5432void CXXNameMangler::mangleTemplateArgs(TemplateName TN,
                                      const TemplateArgumentLoc *TemplateArgs,
                                      unsigned NumTemplateArgs) {
// <template-args> ::= I <template-arg>+ E
Out << 'I';
TemplateArgManglingInfo Info(TN);
for (unsigned i = 0; i != NumTemplateArgs; ++i)
  mangleTemplateArg(TemplateArgs[i].getArgument(),
                    Info.needExactType(i, TemplateArgs[i].getArgument()));
Out << 'E';
5442}

5444void CXXNameMangler::mangleTemplateArgs(TemplateName TN,
                                      const TemplateArgumentList &AL) {
// <template-args> ::= I <template-arg>+ E
Out << 'I';
TemplateArgManglingInfo Info(TN);
for (unsigned i = 0, e = AL.size(); i != e; ++i)
  mangleTemplateArg(AL[i], Info.needExactType(i, AL[i]));
Out << 'E';
5452}

5454void CXXNameMangler::mangleTemplateArgs(TemplateName TN,
                                      ArrayRef<TemplateArgument> Args) {
// <template-args> ::= I <template-arg>+ E
Out << 'I';
TemplateArgManglingInfo Info(TN);
for (unsigned i = 0; i != Args.size(); ++i)
  mangleTemplateArg(Args[i], Info.needExactType(i, Args[i]));
Out << 'E';
5462}

5464void CXXNameMangler::mangleTemplateArg(TemplateArgument A, bool NeedExactType) {
// <template-arg> ::= <type>              # type or template
//                ::= X <expression> E    # expression
//                ::= <expr-primary>      # simple expressions
//                ::= J <template-arg>* E # argument pack
if (!A.isInstantiationDependent() || A.isDependent())
  A = Context.getASTContext().getCanonicalTemplateArgument(A);

switch (A.getKind()) {
case TemplateArgument::Null:
  llvm_unreachable("Cannot mangle NULL template argument")::llvm::llvm_unreachable_internal("Cannot mangle NULL template argument"
, "clang/lib/AST/ItaniumMangle.cpp", 5474);

case TemplateArgument::Type:
  mangleType(A.getAsType());
  break;
case TemplateArgument::Template:
  // This is mangled as <type>.
  mangleType(A.getAsTemplate());
  break;
case TemplateArgument::TemplateExpansion:
  // <type>  ::= Dp <type>          # pack expansion (C++0x)
  Out << "Dp";
  mangleType(A.getAsTemplateOrTemplatePattern());
  break;
case TemplateArgument::Expression:
  mangleTemplateArgExpr(A.getAsExpr());
  break;
case TemplateArgument::Integral:
  mangleIntegerLiteral(A.getIntegralType(), A.getAsIntegral());
  break;
case TemplateArgument::Declaration: {
  //  <expr-primary> ::= L <mangled-name> E # external name
  ValueDecl *D = A.getAsDecl();

  // Template parameter objects are modeled by reproducing a source form
  // produced as if by aggregate initialization.
  if (A.getParamTypeForDecl()->isRecordType()) {
    auto *TPO = cast<TemplateParamObjectDecl>(D);
    mangleValueInTemplateArg(TPO->getType().getUnqualifiedType(),
                             TPO->getValue(), /*TopLevel=*/true,
                             NeedExactType);
    break;
  }

  ASTContext &Ctx = Context.getASTContext();
  APValue Value;
  if (D->isCXXInstanceMember())
    // Simple pointer-to-member with no conversion.
    Value = APValue(D, /*IsDerivedMember=*/false, /*Path=*/{});
  else if (D->getType()->isArrayType() &&
           Ctx.hasSimilarType(Ctx.getDecayedType(D->getType()),
                              A.getParamTypeForDecl()) &&
           Ctx.getLangOpts().getClangABICompat() >
               LangOptions::ClangABI::Ver11)
    // Build a value corresponding to this implicit array-to-pointer decay.
    Value = APValue(APValue::LValueBase(D), CharUnits::Zero(),
                    {APValue::LValuePathEntry::ArrayIndex(0)},
                    /*OnePastTheEnd=*/false);
  else
    // Regular pointer or reference to a declaration.
    Value = APValue(APValue::LValueBase(D), CharUnits::Zero(),
                    ArrayRef<APValue::LValuePathEntry>(),
                    /*OnePastTheEnd=*/false);
  mangleValueInTemplateArg(A.getParamTypeForDecl(), Value, /*TopLevel=*/true,
                           NeedExactType);
  break;
}
case TemplateArgument::NullPtr: {
  mangleNullPointer(A.getNullPtrType());
  break;
}
case TemplateArgument::Pack: {
  //  <template-arg> ::= J <template-arg>* E
  Out << 'J';
  for (const auto &P : A.pack_elements())
    mangleTemplateArg(P, NeedExactType);
  Out << 'E';
}
}
5543}

5545void CXXNameMangler::mangleTemplateArgExpr(const Expr *E) {
ASTContext &Ctx = Context.getASTContext();
if (Ctx.getLangOpts().getClangABICompat() > LangOptions::ClangABI::Ver11) {
  mangleExpression(E, UnknownArity, /*AsTemplateArg=*/true);
  return;
}

// Prior to Clang 12, we didn't omit the X .. E around <expr-primary>
// correctly in cases where the template argument was
// constructed from an expression rather than an already-evaluated
// literal. In such a case, we would then e.g. emit 'XLi0EE' instead of
// 'Li0E'.
//
// We did special-case DeclRefExpr to attempt to DTRT for that one
// expression-kind, but while doing so, unfortunately handled ParmVarDecl
// (subtype of VarDecl) _incorrectly_, and emitted 'L_Z .. E' instead of
// the proper 'Xfp_E'.
E = E->IgnoreParenImpCasts();
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
  const ValueDecl *D = DRE->getDecl();
  if (isa<VarDecl>(D) || isa<FunctionDecl>(D)) {
    Out << 'L';
    mangle(D);
    Out << 'E';
    return;
  }
}
Out << 'X';
mangleExpression(E);
Out << 'E';
5575}

5577/// Determine whether a given value is equivalent to zero-initialization for
5578/// the purpose of discarding a trailing portion of a 'tl' mangling.
5579///
5580/// Note that this is not in general equivalent to determining whether the
5581/// value has an all-zeroes bit pattern.
5582static bool isZeroInitialized(QualType T, const APValue &V) {
// FIXME: mangleValueInTemplateArg has quadratic time complexity in
// pathological cases due to using this, but it's a little awkward
// to do this in linear time in general.
switch (V.getKind()) {
case APValue::None:
case APValue::Indeterminate:
case APValue::AddrLabelDiff:
  return false;

case APValue::Struct: {
  const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
  assert(RD && "unexpected type for record value")(static_cast <bool> (RD && "unexpected type for record value"
) ? void (0) : __assert_fail ("RD && \"unexpected type for record value\""
, "clang/lib/AST/ItaniumMangle.cpp", 5594, __extension__ __PRETTY_FUNCTION__
));
  unsigned I = 0;
  for (const CXXBaseSpecifier &BS : RD->bases()) {
    if (!isZeroInitialized(BS.getType(), V.getStructBase(I)))
      return false;
    ++I;
  }
  I = 0;
  for (const FieldDecl *FD : RD->fields()) {
    if (!FD->isUnnamedBitfield() &&
        !isZeroInitialized(FD->getType(), V.getStructField(I)))
      return false;
    ++I;
  }
  return true;
}

case APValue::Union: {
  const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
  assert(RD && "unexpected type for union value")(static_cast <bool> (RD && "unexpected type for union value"
) ? void (0) : __assert_fail ("RD && \"unexpected type for union value\""
, "clang/lib/AST/ItaniumMangle.cpp", 5613, __extension__ __PRETTY_FUNCTION__
));
  // Zero-initialization zeroes the first non-unnamed-bitfield field, if any.
  for (const FieldDecl *FD : RD->fields()) {
    if (!FD->isUnnamedBitfield())
      return V.getUnionField() && declaresSameEntity(FD, V.getUnionField()) &&
             isZeroInitialized(FD->getType(), V.getUnionValue());
  }
  // If there are no fields (other than unnamed bitfields), the value is
  // necessarily zero-initialized.
  return true;
}

case APValue::Array: {
  QualType ElemT(T->getArrayElementTypeNoTypeQual(), 0);
  for (unsigned I = 0, N = V.getArrayInitializedElts(); I != N; ++I)
    if (!isZeroInitialized(ElemT, V.getArrayInitializedElt(I)))
      return false;
  return !V.hasArrayFiller() || isZeroInitialized(ElemT, V.getArrayFiller());
}

case APValue::Vector: {
  const VectorType *VT = T->castAs<VectorType>();
  for (unsigned I = 0, N = V.getVectorLength(); I != N; ++I)
    if (!isZeroInitialized(VT->getElementType(), V.getVectorElt(I)))
      return false;
  return true;
}

case APValue::Int:
  return !V.getInt();

case APValue::Float:
  return V.getFloat().isPosZero();

case APValue::FixedPoint:
  return !V.getFixedPoint().getValue();

case APValue::ComplexFloat:
  return V.getComplexFloatReal().isPosZero() &&
         V.getComplexFloatImag().isPosZero();

case APValue::ComplexInt:
  return !V.getComplexIntReal() && !V.getComplexIntImag();

case APValue::LValue:
  return V.isNullPointer();

case APValue::MemberPointer:
  return !V.getMemberPointerDecl();
}

llvm_unreachable("Unhandled APValue::ValueKind enum")::llvm::llvm_unreachable_internal("Unhandled APValue::ValueKind enum"
, "clang/lib/AST/ItaniumMangle.cpp", 5664);
5665}

5667static QualType getLValueType(ASTContext &Ctx, const APValue &LV) {
QualType T = LV.getLValueBase().getType();
for (APValue::LValuePathEntry E : LV.getLValuePath()) {
  if (const ArrayType *AT = Ctx.getAsArrayType(T))
    T = AT->getElementType();
  else if (const FieldDecl *FD =
               dyn_cast<FieldDecl>(E.getAsBaseOrMember().getPointer()))
    T = FD->getType();
  else
    T = Ctx.getRecordType(
        cast<CXXRecordDecl>(E.getAsBaseOrMember().getPointer()));
}
return T;
5680}

5682static IdentifierInfo *getUnionInitName(SourceLocation UnionLoc,
                                      DiagnosticsEngine &Diags,
                                      const FieldDecl *FD) {
// According to:
// http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling.anonymous
// For the purposes of mangling, the name of an anonymous union is considered
// to be the name of the first named data member found by a pre-order,
// depth-first, declaration-order walk of the data members of the anonymous
// union.

if (FD->getIdentifier())
  return FD->getIdentifier();

// The only cases where the identifer of a FieldDecl would be blank is if the
// field represents an anonymous record type or if it is an unnamed bitfield.
// There is no type to descend into in the case of a bitfield, so we can just
// return nullptr in that case.
if (FD->isBitField())
  return nullptr;
const CXXRecordDecl *RD = FD->getType()->getAsCXXRecordDecl();

// Consider only the fields in declaration order, searched depth-first.  We
// don't care about the active member of the union, as all we are doing is
// looking for a valid name. We also don't check bases, due to guidance from
// the Itanium ABI folks.
for (const FieldDecl *RDField : RD->fields()) {
  if (IdentifierInfo *II = getUnionInitName(UnionLoc, Diags, RDField))
    return II;
}

// According to the Itanium ABI: If there is no such data member (i.e., if all
// of the data members in the union are unnamed), then there is no way for a
// program to refer to the anonymous union, and there is therefore no need to
// mangle its name. However, we should diagnose this anyway.
unsigned DiagID = Diags.getCustomDiagID(
    DiagnosticsEngine::Error, "cannot mangle this unnamed union NTTP yet");
Diags.Report(UnionLoc, DiagID);

return nullptr;
5721}

5723void CXXNameMangler::mangleValueInTemplateArg(QualType T, const APValue &V,
                                            bool TopLevel,
                                            bool NeedExactType) {
// Ignore all top-level cv-qualifiers, to match GCC.
Qualifiers Quals;
T = getASTContext().getUnqualifiedArrayType(T, Quals);

// A top-level expression that's not a primary expression is wrapped in X...E.
bool IsPrimaryExpr = true;
auto NotPrimaryExpr = [&] {
  if (TopLevel && IsPrimaryExpr)
    Out << 'X';
  IsPrimaryExpr = false;
};

// Proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/63.
switch (V.getKind()) {
case APValue::None:
case APValue::Indeterminate:
  Out << 'L';
  mangleType(T);
  Out << 'E';
  break;

case APValue::AddrLabelDiff:
  llvm_unreachable("unexpected value kind in template argument")::llvm::llvm_unreachable_internal("unexpected value kind in template argument"
, "clang/lib/AST/ItaniumMangle.cpp", 5748);

case APValue::Struct: {
  const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
  assert(RD && "unexpected type for record value")(static_cast <bool> (RD && "unexpected type for record value"
) ? void (0) : __assert_fail ("RD && \"unexpected type for record value\""
, "clang/lib/AST/ItaniumMangle.cpp", 5752, __extension__ __PRETTY_FUNCTION__
));

  // Drop trailing zero-initialized elements.
  llvm::SmallVector<const FieldDecl *, 16> Fields(RD->fields());
  while (
      !Fields.empty() &&
      (Fields.back()->isUnnamedBitfield() ||
       isZeroInitialized(Fields.back()->getType(),
                         V.getStructField(Fields.back()->getFieldIndex())))) {
    Fields.pop_back();
  }
  llvm::ArrayRef<CXXBaseSpecifier> Bases(RD->bases_begin(), RD->bases_end());
  if (Fields.empty()) {
    while (!Bases.empty() &&
           isZeroInitialized(Bases.back().getType(),
                             V.getStructBase(Bases.size() - 1)))
      Bases = Bases.drop_back();
  }

  // <expression> ::= tl <type> <braced-expression>* E
  NotPrimaryExpr();
  Out << "tl";
  mangleType(T);
  for (unsigned I = 0, N = Bases.size(); I != N; ++I)
    mangleValueInTemplateArg(Bases[I].getType(), V.getStructBase(I), false);
  for (unsigned I = 0, N = Fields.size(); I != N; ++I) {
    if (Fields[I]->isUnnamedBitfield())
      continue;
    mangleValueInTemplateArg(Fields[I]->getType(),
                             V.getStructField(Fields[I]->getFieldIndex()),
                             false);
  }
  Out << 'E';
  break;
}

case APValue::Union: {
  assert(T->getAsCXXRecordDecl() && "unexpected type for union value")(static_cast <bool> (T->getAsCXXRecordDecl() &&
 "unexpected type for union value") ? void (0) : __assert_fail
 ("T->getAsCXXRecordDecl() && \"unexpected type for union value\""
, "clang/lib/AST/ItaniumMangle.cpp", 5789, __extension__ __PRETTY_FUNCTION__
));
  const FieldDecl *FD = V.getUnionField();

  if (!FD) {
    Out << 'L';
    mangleType(T);
    Out << 'E';
    break;
  }

  // <braced-expression> ::= di <field source-name> <braced-expression>
  NotPrimaryExpr();
  Out << "tl";
  mangleType(T);
  if (!isZeroInitialized(T, V)) {
    Out << "di";
    IdentifierInfo *II = (getUnionInitName(
        T->getAsCXXRecordDecl()->getLocation(), Context.getDiags(), FD));
    if (II)
      mangleSourceName(II);
    mangleValueInTemplateArg(FD->getType(), V.getUnionValue(), false);
  }
  Out << 'E';
  break;
}

case APValue::Array: {
  QualType ElemT(T->getArrayElementTypeNoTypeQual(), 0);

  NotPrimaryExpr();