diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/Index/CodegenNameGenerator.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Index/CodegenNameGenerator.cpp | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Index/CodegenNameGenerator.cpp b/contrib/llvm/tools/clang/lib/Index/CodegenNameGenerator.cpp new file mode 100644 index 000000000000..92740b05703b --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Index/CodegenNameGenerator.cpp @@ -0,0 +1,195 @@ +//===- CodegenNameGenerator.cpp - Codegen name generation -----------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Determines the name that the symbol will get for code generation. +// +//===----------------------------------------------------------------------===// + +#include "clang/Index/CodegenNameGenerator.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclCXX.h" +#include "clang/AST/DeclObjC.h" +#include "clang/AST/Mangle.h" +#include "clang/AST/VTableBuilder.h" +#include "clang/Basic/TargetInfo.h" +#include "llvm/IR/DataLayout.h" +#include "llvm/IR/Mangler.h" +#include "llvm/Support/raw_ostream.h" + +using namespace clang; +using namespace clang::index; + +struct CodegenNameGenerator::Implementation { + std::unique_ptr<MangleContext> MC; + llvm::DataLayout DL; + + Implementation(ASTContext &Ctx) + : MC(Ctx.createMangleContext()), + DL(Ctx.getTargetInfo().getDataLayout()) {} + + bool writeName(const Decl *D, raw_ostream &OS) { + // First apply frontend mangling. + SmallString<128> FrontendBuf; + llvm::raw_svector_ostream FrontendBufOS(FrontendBuf); + if (auto *FD = dyn_cast<FunctionDecl>(D)) { + if (FD->isDependentContext()) + return true; + if (writeFuncOrVarName(FD, FrontendBufOS)) + return true; + } else if (auto *VD = dyn_cast<VarDecl>(D)) { + if (writeFuncOrVarName(VD, FrontendBufOS)) + return true; + } else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) { + MC->mangleObjCMethodNameWithoutSize(MD, OS); + return false; + } else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) { + writeObjCClassName(ID, FrontendBufOS); + } else { + return true; + } + + // Now apply backend mangling. + llvm::Mangler::getNameWithPrefix(OS, FrontendBufOS.str(), DL); + return false; + } + + std::string getName(const Decl *D) { + std::string Name; + { + llvm::raw_string_ostream OS(Name); + writeName(D, OS); + } + return Name; + } + + std::vector<std::string> getAllManglings(const Decl *D) { + if (!(isa<CXXRecordDecl>(D) || isa<CXXMethodDecl>(D))) + return {}; + + const NamedDecl *ND = cast<NamedDecl>(D); + + ASTContext &Ctx = ND->getASTContext(); + std::unique_ptr<MangleContext> M(Ctx.createMangleContext()); + + std::vector<std::string> Manglings; + + auto hasDefaultCXXMethodCC = [](ASTContext &C, const CXXMethodDecl *MD) { + auto DefaultCC = C.getDefaultCallingConvention(/*IsVariadic=*/false, + /*IsCSSMethod=*/true); + auto CC = MD->getType()->getAs<FunctionProtoType>()->getCallConv(); + return CC == DefaultCC; + }; + + if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND)) { + Manglings.emplace_back(getMangledStructor(CD, Ctor_Base)); + + if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily()) + if (!CD->getParent()->isAbstract()) + Manglings.emplace_back(getMangledStructor(CD, Ctor_Complete)); + + if (Ctx.getTargetInfo().getCXXABI().isMicrosoft()) + if (CD->hasAttr<DLLExportAttr>() && CD->isDefaultConstructor()) + if (!(hasDefaultCXXMethodCC(Ctx, CD) && CD->getNumParams() == 0)) + Manglings.emplace_back(getMangledStructor(CD, Ctor_DefaultClosure)); + } else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND)) { + Manglings.emplace_back(getMangledStructor(DD, Dtor_Base)); + if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily()) { + Manglings.emplace_back(getMangledStructor(DD, Dtor_Complete)); + if (DD->isVirtual()) + Manglings.emplace_back(getMangledStructor(DD, Dtor_Deleting)); + } + } else if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(ND)) { + Manglings.emplace_back(getName(ND)); + if (MD->isVirtual()) + if (const auto *TIV = Ctx.getVTableContext()->getThunkInfo(MD)) + for (const auto &T : *TIV) + Manglings.emplace_back(getMangledThunk(MD, T)); + } + + return Manglings; + } + +private: + bool writeFuncOrVarName(const NamedDecl *D, raw_ostream &OS) { + if (MC->shouldMangleDeclName(D)) { + if (const auto *CtorD = dyn_cast<CXXConstructorDecl>(D)) + MC->mangleCXXCtor(CtorD, Ctor_Complete, OS); + else if (const auto *DtorD = dyn_cast<CXXDestructorDecl>(D)) + MC->mangleCXXDtor(DtorD, Dtor_Complete, OS); + else + MC->mangleName(D, OS); + return false; + } else { + IdentifierInfo *II = D->getIdentifier(); + if (!II) + return true; + OS << II->getName(); + return false; + } + } + + void writeObjCClassName(const ObjCInterfaceDecl *D, raw_ostream &OS) { + OS << getClassSymbolPrefix(); + OS << D->getObjCRuntimeNameAsString(); + } + + static StringRef getClassSymbolPrefix() { + return "OBJC_CLASS_$_"; + } + + std::string getMangledStructor(const NamedDecl *ND, unsigned StructorType) { + std::string FrontendBuf; + llvm::raw_string_ostream FOS(FrontendBuf); + + if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND)) + MC->mangleCXXCtor(CD, static_cast<CXXCtorType>(StructorType), FOS); + else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND)) + MC->mangleCXXDtor(DD, static_cast<CXXDtorType>(StructorType), FOS); + + std::string BackendBuf; + llvm::raw_string_ostream BOS(BackendBuf); + + llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL); + + return BOS.str(); + } + + std::string getMangledThunk(const CXXMethodDecl *MD, const ThunkInfo &T) { + std::string FrontendBuf; + llvm::raw_string_ostream FOS(FrontendBuf); + + MC->mangleThunk(MD, T, FOS); + + std::string BackendBuf; + llvm::raw_string_ostream BOS(BackendBuf); + + llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL); + + return BOS.str(); + } +}; + +CodegenNameGenerator::CodegenNameGenerator(ASTContext &Ctx) + : Impl(new Implementation(Ctx)) { +} + +CodegenNameGenerator::~CodegenNameGenerator() { +} + +bool CodegenNameGenerator::writeName(const Decl *D, raw_ostream &OS) { + return Impl->writeName(D, OS); +} + +std::string CodegenNameGenerator::getName(const Decl *D) { + return Impl->getName(D); +} + +std::vector<std::string> CodegenNameGenerator::getAllManglings(const Decl *D) { + return Impl->getAllManglings(D); +} |