1 //===- CodegenNameGenerator.cpp - Codegen name generation -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Determines the name that the symbol will get for code generation.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Index/CodegenNameGenerator.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/Mangle.h"
19 #include "clang/AST/VTableBuilder.h"
20 #include "clang/Basic/TargetInfo.h"
21 #include "llvm/IR/DataLayout.h"
22 #include "llvm/IR/Mangler.h"
23 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
26 using namespace clang::index;
28 struct CodegenNameGenerator::Implementation {
29 std::unique_ptr<MangleContext> MC;
32 Implementation(ASTContext &Ctx)
33 : MC(Ctx.createMangleContext()),
34 DL(Ctx.getTargetInfo().getDataLayout()) {}
36 bool writeName(const Decl *D, raw_ostream &OS) {
37 // First apply frontend mangling.
38 SmallString<128> FrontendBuf;
39 llvm::raw_svector_ostream FrontendBufOS(FrontendBuf);
40 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
41 if (FD->isDependentContext())
43 if (writeFuncOrVarName(FD, FrontendBufOS))
45 } else if (auto *VD = dyn_cast<VarDecl>(D)) {
46 if (writeFuncOrVarName(VD, FrontendBufOS))
48 } else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
49 MC->mangleObjCMethodNameWithoutSize(MD, OS);
51 } else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
52 writeObjCClassName(ID, FrontendBufOS);
57 // Now apply backend mangling.
58 llvm::Mangler::getNameWithPrefix(OS, FrontendBufOS.str(), DL);
62 std::string getName(const Decl *D) {
65 llvm::raw_string_ostream OS(Name);
76 std::vector<std::string> getAllManglings(const ObjCContainerDecl *OCD) {
78 if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
79 ClassName = OID->getObjCRuntimeNameAsString();
80 else if (const auto *OID = dyn_cast<ObjCImplementationDecl>(OCD))
81 ClassName = OID->getObjCRuntimeNameAsString();
83 if (ClassName.empty())
86 auto Mangle = [&](ObjCKind Kind, StringRef ClassName) -> std::string {
87 SmallString<40> Mangled;
88 auto Prefix = getClassSymbolPrefix(Kind, OCD->getASTContext());
89 llvm::Mangler::getNameWithPrefix(Mangled, Prefix + ClassName, DL);
94 Mangle(ObjCClass, ClassName),
95 Mangle(ObjCMetaclass, ClassName),
99 std::vector<std::string> getAllManglings(const Decl *D) {
100 if (const auto *OCD = dyn_cast<ObjCContainerDecl>(D))
101 return getAllManglings(OCD);
103 if (!(isa<CXXRecordDecl>(D) || isa<CXXMethodDecl>(D)))
106 const NamedDecl *ND = cast<NamedDecl>(D);
108 ASTContext &Ctx = ND->getASTContext();
109 std::unique_ptr<MangleContext> M(Ctx.createMangleContext());
111 std::vector<std::string> Manglings;
113 auto hasDefaultCXXMethodCC = [](ASTContext &C, const CXXMethodDecl *MD) {
114 auto DefaultCC = C.getDefaultCallingConvention(/*IsVariadic=*/false,
115 /*IsCSSMethod=*/true);
116 auto CC = MD->getType()->getAs<FunctionProtoType>()->getCallConv();
117 return CC == DefaultCC;
120 if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND)) {
121 Manglings.emplace_back(getMangledStructor(CD, Ctor_Base));
123 if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily())
124 if (!CD->getParent()->isAbstract())
125 Manglings.emplace_back(getMangledStructor(CD, Ctor_Complete));
127 if (Ctx.getTargetInfo().getCXXABI().isMicrosoft())
128 if (CD->hasAttr<DLLExportAttr>() && CD->isDefaultConstructor())
129 if (!(hasDefaultCXXMethodCC(Ctx, CD) && CD->getNumParams() == 0))
130 Manglings.emplace_back(getMangledStructor(CD, Ctor_DefaultClosure));
131 } else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND)) {
132 Manglings.emplace_back(getMangledStructor(DD, Dtor_Base));
133 if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily()) {
134 Manglings.emplace_back(getMangledStructor(DD, Dtor_Complete));
136 Manglings.emplace_back(getMangledStructor(DD, Dtor_Deleting));
138 } else if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(ND)) {
139 Manglings.emplace_back(getName(ND));
141 if (const auto *TIV = Ctx.getVTableContext()->getThunkInfo(MD))
142 for (const auto &T : *TIV)
143 Manglings.emplace_back(getMangledThunk(MD, T));
150 bool writeFuncOrVarName(const NamedDecl *D, raw_ostream &OS) {
151 if (MC->shouldMangleDeclName(D)) {
152 if (const auto *CtorD = dyn_cast<CXXConstructorDecl>(D))
153 MC->mangleCXXCtor(CtorD, Ctor_Complete, OS);
154 else if (const auto *DtorD = dyn_cast<CXXDestructorDecl>(D))
155 MC->mangleCXXDtor(DtorD, Dtor_Complete, OS);
157 MC->mangleName(D, OS);
160 IdentifierInfo *II = D->getIdentifier();
168 void writeObjCClassName(const ObjCInterfaceDecl *D, raw_ostream &OS) {
169 OS << getClassSymbolPrefix(ObjCClass, D->getASTContext());
170 OS << D->getObjCRuntimeNameAsString();
173 static StringRef getClassSymbolPrefix(ObjCKind Kind, const ASTContext &Context) {
174 if (Context.getLangOpts().ObjCRuntime.isGNUFamily())
175 return Kind == ObjCMetaclass ? "_OBJC_METACLASS_" : "_OBJC_CLASS_";
176 return Kind == ObjCMetaclass ? "OBJC_METACLASS_$_" : "OBJC_CLASS_$_";
179 std::string getMangledStructor(const NamedDecl *ND, unsigned StructorType) {
180 std::string FrontendBuf;
181 llvm::raw_string_ostream FOS(FrontendBuf);
183 if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND))
184 MC->mangleCXXCtor(CD, static_cast<CXXCtorType>(StructorType), FOS);
185 else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND))
186 MC->mangleCXXDtor(DD, static_cast<CXXDtorType>(StructorType), FOS);
188 std::string BackendBuf;
189 llvm::raw_string_ostream BOS(BackendBuf);
191 llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
196 std::string getMangledThunk(const CXXMethodDecl *MD, const ThunkInfo &T) {
197 std::string FrontendBuf;
198 llvm::raw_string_ostream FOS(FrontendBuf);
200 MC->mangleThunk(MD, T, FOS);
202 std::string BackendBuf;
203 llvm::raw_string_ostream BOS(BackendBuf);
205 llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
211 CodegenNameGenerator::CodegenNameGenerator(ASTContext &Ctx)
212 : Impl(new Implementation(Ctx)) {
215 CodegenNameGenerator::~CodegenNameGenerator() {
218 bool CodegenNameGenerator::writeName(const Decl *D, raw_ostream &OS) {
219 return Impl->writeName(D, OS);
222 std::string CodegenNameGenerator::getName(const Decl *D) {
223 return Impl->getName(D);
226 std::vector<std::string> CodegenNameGenerator::getAllManglings(const Decl *D) {
227 return Impl->getAllManglings(D);