diff options
Diffstat (limited to 'contrib/llvm-project/clang/lib/AST/ItaniumMangle.cpp')
| -rw-r--r-- | contrib/llvm-project/clang/lib/AST/ItaniumMangle.cpp | 280 |
1 files changed, 153 insertions, 127 deletions
diff --git a/contrib/llvm-project/clang/lib/AST/ItaniumMangle.cpp b/contrib/llvm-project/clang/lib/AST/ItaniumMangle.cpp index 2e734e2b28cd..68d4d1271cdb 100644 --- a/contrib/llvm-project/clang/lib/AST/ItaniumMangle.cpp +++ b/contrib/llvm-project/clang/lib/AST/ItaniumMangle.cpp @@ -40,65 +40,10 @@ using namespace clang; namespace { -/// Retrieve the declaration context that should be used when mangling the given -/// declaration. -static const DeclContext *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(); - } - - 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 VD->getASTContext().getTranslationUnitDecl(); - - if (const auto *FD = dyn_cast<FunctionDecl>(D)) - if (FD->isExternC()) - return FD->getASTContext().getTranslationUnitDecl(); - - return DC->getRedeclContext(); -} - -static const DeclContext *getEffectiveParentContext(const DeclContext *DC) { - return getEffectiveDeclContext(cast<Decl>(DC)); -} - static bool isLocalContainerContext(const DeclContext *DC) { return isa<FunctionDecl>(DC) || isa<ObjCMethodDecl>(DC) || isa<BlockDecl>(DC); } -static const RecordDecl *GetLocalClassDecl(const Decl *D) { - const DeclContext *DC = getEffectiveDeclContext(D); - while (!DC->isNamespace() && !DC->isTranslationUnit()) { - if (isLocalContainerContext(DC)) - return dyn_cast<RecordDecl>(D); - D = cast<Decl>(DC); - DC = getEffectiveDeclContext(D); - } - return nullptr; -} - static const FunctionDecl *getStructor(const FunctionDecl *fn) { if (const FunctionTemplateDecl *ftd = fn->getPrimaryTemplate()) return ftd->getTemplatedDecl(); @@ -126,6 +71,7 @@ class ItaniumMangleContextImpl : public ItaniumMangleContext { llvm::DenseMap<DiscriminatorKeyTy, unsigned> Discriminator; llvm::DenseMap<const NamedDecl*, unsigned> Uniquifier; const DiscriminatorOverrideTy DiscriminatorOverride = nullptr; + NamespaceDecl *StdNamespace = nullptr; bool NeedsUniqueInternalLinkageNames = false; @@ -249,6 +195,16 @@ public: 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); + /// @} }; @@ -427,6 +383,15 @@ class CXXNameMangler { 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); + public: CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_, const NamedDecl *D = nullptr, bool NullOut_ = false) @@ -628,7 +593,71 @@ private: } -static bool isInternalLinkageDecl(const NamedDecl *ND) { +NamespaceDecl *ItaniumMangleContextImpl::getStdNamespace() { + if (!StdNamespace) { + StdNamespace = NamespaceDecl::Create( + getASTContext(), getASTContext().getTranslationUnitDecl(), + /*Inline*/ false, SourceLocation(), SourceLocation(), + &getASTContext().Idents.get("std"), + /*PrevDecl*/ nullptr); + StdNamespace->setImplicit(); + } + return StdNamespace; +} + +/// Retrieve the declaration context that should be used when mangling the given +/// declaration. +const DeclContext * +ItaniumMangleContextImpl::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(); +} + +bool ItaniumMangleContextImpl::isInternalLinkageDecl(const NamedDecl *ND) { if (ND && ND->getFormalLinkage() == InternalLinkage && !ND->isExternallyVisible() && getEffectiveDeclContext(ND)->isFileContext() && @@ -862,18 +891,9 @@ void CXXNameMangler::mangleFunctionEncodingBareType(const FunctionDecl *FD) { MangleReturnType, FD); } -static const DeclContext *IgnoreLinkageSpecDecls(const DeclContext *DC) { - while (isa<LinkageSpecDecl>(DC)) { - DC = getEffectiveParentContext(DC); - } - - return DC; -} - /// Return whether a given namespace is the 'std' namespace. -static bool isStd(const NamespaceDecl *NS) { - if (!IgnoreLinkageSpecDecls(getEffectiveParentContext(NS)) - ->isTranslationUnit()) +bool CXXNameMangler::isStd(const NamespaceDecl *NS) { + if (!Context.getEffectiveParentContext(NS)->isTranslationUnit()) return false; const IdentifierInfo *II = NS->getOriginalNamespace()->getIdentifier(); @@ -882,7 +902,7 @@ static bool isStd(const NamespaceDecl *NS) { // isStdNamespace - Return whether a given decl context is a toplevel 'std' // namespace. -static bool isStdNamespace(const DeclContext *DC) { +bool CXXNameMangler::isStdNamespace(const DeclContext *DC) { if (!DC->isNamespace()) return false; @@ -956,6 +976,17 @@ void CXXNameMangler::mangleName(GlobalDecl GD) { } } +const 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; +} + void CXXNameMangler::mangleNameWithAbiTags(GlobalDecl GD, const AbiTagList *AdditionalAbiTags) { const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); @@ -964,7 +995,7 @@ void CXXNameMangler::mangleNameWithAbiTags(GlobalDecl GD, // ::= [<module-name>] <unscoped-template-name> <template-args> // ::= <local-name> // - const DeclContext *DC = getEffectiveDeclContext(ND); + 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. @@ -972,13 +1003,13 @@ void CXXNameMangler::mangleNameWithAbiTags(GlobalDecl GD, // a proper semantic declaration context! if (isLocalContainerContext(DC) && ND->hasLinkage() && !isLambda(ND)) while (!DC->isNamespace() && !DC->isTranslationUnit()) - DC = getEffectiveParentContext(DC); + DC = Context.getEffectiveParentContext(DC); else if (GetLocalClassDecl(ND)) { mangleLocalName(GD, AdditionalAbiTags); return; } - DC = IgnoreLinkageSpecDecls(DC); + assert(!isa<LinkageSpecDecl>(DC) && "context cannot be LinkageSpecDecl"); if (isLocalContainerContext(DC)) { mangleLocalName(GD, AdditionalAbiTags); @@ -1054,7 +1085,7 @@ void CXXNameMangler::mangleModuleNamePrefix(StringRef Name) { void CXXNameMangler::mangleTemplateName(const TemplateDecl *TD, const TemplateArgument *TemplateArgs, unsigned NumTemplateArgs) { - const DeclContext *DC = IgnoreLinkageSpecDecls(getEffectiveDeclContext(TD)); + const DeclContext *DC = Context.getEffectiveDeclContext(TD); if (DC->isTranslationUnit() || isStdNamespace(DC)) { mangleUnscopedTemplateName(TD, nullptr); @@ -1070,7 +1101,7 @@ void CXXNameMangler::mangleUnscopedName(GlobalDecl GD, // <unscoped-name> ::= <unqualified-name> // ::= St <unqualified-name> # ::std:: - if (isStdNamespace(IgnoreLinkageSpecDecls(getEffectiveDeclContext(ND)))) + if (isStdNamespace(Context.getEffectiveDeclContext(ND))) Out << "St"; mangleUnqualifiedName(GD, AdditionalAbiTags); @@ -1430,7 +1461,7 @@ void CXXNameMangler::mangleUnqualifiedName(GlobalDecl GD, // 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 (isInternalLinkageDecl(ND)) + if (Context.isInternalLinkageDecl(ND)) Out << 'L'; auto *FD = dyn_cast<FunctionDecl>(ND); @@ -1745,7 +1776,7 @@ void CXXNameMangler::mangleLocalName(GlobalDecl GD, // <discriminator> := _ <non-negative number> assert(isa<NamedDecl>(D) || isa<BlockDecl>(D)); const RecordDecl *RD = GetLocalClassDecl(D); - const DeclContext *DC = getEffectiveDeclContext(RD ? RD : D); + const DeclContext *DC = Context.getEffectiveDeclContext(RD ? RD : D); Out << 'Z'; @@ -1798,13 +1829,13 @@ void CXXNameMangler::mangleLocalName(GlobalDecl GD, if (const NamedDecl *PrefixND = getClosurePrefix(BD)) mangleClosurePrefix(PrefixND, true /*NoFunction*/); else - manglePrefix(getEffectiveDeclContext(BD), true /*NoFunction*/); + manglePrefix(Context.getEffectiveDeclContext(BD), true /*NoFunction*/); assert(!AdditionalAbiTags && "Block cannot have additional abi tags"); mangleUnqualifiedBlock(BD); } else { const NamedDecl *ND = cast<NamedDecl>(D); - mangleNestedName(GD, getEffectiveDeclContext(ND), AdditionalAbiTags, - true /*NoFunction*/); + 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 @@ -1843,7 +1874,7 @@ void CXXNameMangler::mangleBlockForPrefix(const BlockDecl *Block) { mangleLocalName(Block, /* AdditionalAbiTags */ nullptr); return; } - const DeclContext *DC = getEffectiveDeclContext(Block); + const DeclContext *DC = Context.getEffectiveDeclContext(Block); if (isLocalContainerContext(DC)) { mangleLocalName(Block, /* AdditionalAbiTags */ nullptr); return; @@ -2030,7 +2061,7 @@ void CXXNameMangler::manglePrefix(const DeclContext *DC, bool NoFunction) { // ::= # empty // ::= <substitution> - DC = IgnoreLinkageSpecDecls(DC); + assert(!isa<LinkageSpecDecl>(DC) && "prefix cannot be LinkageSpecDecl"); if (DC->isTranslationUnit()) return; @@ -2053,7 +2084,7 @@ void CXXNameMangler::manglePrefix(const DeclContext *DC, bool NoFunction) { mangleClosurePrefix(PrefixND, NoFunction); mangleUnqualifiedName(ND, nullptr); } else { - manglePrefix(getEffectiveDeclContext(ND), NoFunction); + manglePrefix(Context.getEffectiveDeclContext(ND), NoFunction); mangleUnqualifiedName(ND, nullptr); } @@ -2107,7 +2138,7 @@ void CXXNameMangler::mangleTemplatePrefix(GlobalDecl GD, if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) { mangleTemplateParameter(TTP->getDepth(), TTP->getIndex()); } else { - manglePrefix(getEffectiveDeclContext(ND), NoFunction); + manglePrefix(Context.getEffectiveDeclContext(ND), NoFunction); if (isa<BuiltinTemplateDecl>(ND) || isa<ConceptDecl>(ND)) mangleUnqualifiedName(GD, nullptr); else @@ -2152,7 +2183,7 @@ void CXXNameMangler::mangleClosurePrefix(const NamedDecl *ND, bool NoFunction) { mangleTemplatePrefix(TD, NoFunction); mangleTemplateArgs(asTemplateName(TD), *TemplateArgs); } else { - manglePrefix(getEffectiveDeclContext(ND), NoFunction); + manglePrefix(Context.getEffectiveDeclContext(ND), NoFunction); mangleUnqualifiedName(ND, nullptr); } @@ -5969,56 +6000,61 @@ bool CXXNameMangler::mangleSubstitution(uintptr_t Ptr) { return true; } -static bool isCharType(QualType T) { - if (T.isNull()) +/// Returns whether S is a template specialization of std::Name with a single +/// argument of type A. +bool CXXNameMangler::isSpecializedAs(QualType S, llvm::StringRef Name, + QualType A) { + if (S.isNull()) return false; - return T->isSpecificBuiltinType(BuiltinType::Char_S) || - T->isSpecificBuiltinType(BuiltinType::Char_U); -} - -/// Returns whether a given type is a template specialization of a given name -/// with a single argument of type char. -static bool isCharSpecialization(QualType T, const char *Name) { - if (T.isNull()) - return false; - - const RecordType *RT = T->getAs<RecordType>(); + const RecordType *RT = S->getAs<RecordType>(); if (!RT) return false; const ClassTemplateSpecializationDecl *SD = dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); - if (!SD) + if (!SD || !SD->getIdentifier()->isStr(Name)) return false; - if (!isStdNamespace(getEffectiveDeclContext(SD))) + if (!isStdNamespace(Context.getEffectiveDeclContext(SD))) return false; const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs(); if (TemplateArgs.size() != 1) return false; - if (!isCharType(TemplateArgs[0].getAsType())) + if (TemplateArgs[0].getAsType() != A) return false; - return SD->getIdentifier()->getName() == Name; + return true; } -template <std::size_t StrLen> -static bool isStreamCharSpecialization(const ClassTemplateSpecializationDecl*SD, - const char (&Str)[StrLen]) { - if (!SD->getIdentifier()->isStr(Str)) +/// Returns whether SD is a template specialization std::Name<char, +/// std::char_traits<char> [, std::allocator<char>]> +/// HasAllocator controls whether the 3rd template argument is needed. +bool CXXNameMangler::isStdCharSpecialization( + const ClassTemplateSpecializationDecl *SD, llvm::StringRef Name, + bool HasAllocator) { + if (!SD->getIdentifier()->isStr(Name)) return false; const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs(); - if (TemplateArgs.size() != 2) + if (TemplateArgs.size() != (HasAllocator ? 3 : 2)) + return false; + + QualType A = TemplateArgs[0].getAsType(); + if (A.isNull()) + return false; + // Plain 'char' is named Char_S or Char_U depending on the target ABI. + if (!A->isSpecificBuiltinType(BuiltinType::Char_S) && + !A->isSpecificBuiltinType(BuiltinType::Char_U)) return false; - if (!isCharType(TemplateArgs[0].getAsType())) + if (!isSpecializedAs(TemplateArgs[1].getAsType(), "char_traits", A)) return false; - if (!isCharSpecialization(TemplateArgs[1].getAsType(), "char_traits")) + if (HasAllocator && + !isSpecializedAs(TemplateArgs[2].getAsType(), "allocator", A)) return false; return true; @@ -6031,10 +6067,11 @@ bool CXXNameMangler::mangleStandardSubstitution(const NamedDecl *ND) { Out << "St"; return true; } + return false; } if (const ClassTemplateDecl *TD = dyn_cast<ClassTemplateDecl>(ND)) { - if (!isStdNamespace(getEffectiveDeclContext(TD))) + if (!isStdNamespace(Context.getEffectiveDeclContext(TD))) return false; // <substitution> ::= Sa # ::std::allocator @@ -6048,56 +6085,45 @@ bool CXXNameMangler::mangleStandardSubstitution(const NamedDecl *ND) { Out << "Sb"; return true; } + return false; } if (const ClassTemplateSpecializationDecl *SD = dyn_cast<ClassTemplateSpecializationDecl>(ND)) { - if (!isStdNamespace(getEffectiveDeclContext(SD))) + if (!isStdNamespace(Context.getEffectiveDeclContext(SD))) return false; // <substitution> ::= Ss # ::std::basic_string<char, // ::std::char_traits<char>, // ::std::allocator<char> > - if (SD->getIdentifier()->isStr("basic_string")) { - const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs(); - - if (TemplateArgs.size() != 3) - return false; - - if (!isCharType(TemplateArgs[0].getAsType())) - return false; - - if (!isCharSpecialization(TemplateArgs[1].getAsType(), "char_traits")) - return false; - - if (!isCharSpecialization(TemplateArgs[2].getAsType(), "allocator")) - return false; - + if (isStdCharSpecialization(SD, "basic_string", /*HasAllocator=*/true)) { Out << "Ss"; return true; } // <substitution> ::= Si # ::std::basic_istream<char, // ::std::char_traits<char> > - if (isStreamCharSpecialization(SD, "basic_istream")) { + if (isStdCharSpecialization(SD, "basic_istream", /*HasAllocator=*/false)) { Out << "Si"; return true; } // <substitution> ::= So # ::std::basic_ostream<char, // ::std::char_traits<char> > - if (isStreamCharSpecialization(SD, "basic_ostream")) { + if (isStdCharSpecialization(SD, "basic_ostream", /*HasAllocator=*/false)) { Out << "So"; return true; } // <substitution> ::= Sd # ::std::basic_iostream<char, // ::std::char_traits<char> > - if (isStreamCharSpecialization(SD, "basic_iostream")) { + if (isStdCharSpecialization(SD, "basic_iostream", /*HasAllocator=*/false)) { Out << "Sd"; return true; } + return false; } + return false; } |