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//===- 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;
}
enum ObjCKind {
ObjCClass,
ObjCMetaclass,
};
std::vector<std::string> getAllManglings(const ObjCContainerDecl *OCD) {
StringRef ClassName;
if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
ClassName = OID->getObjCRuntimeNameAsString();
else if (const auto *OID = dyn_cast<ObjCImplementationDecl>(OCD))
ClassName = OID->getObjCRuntimeNameAsString();
if (ClassName.empty())
return {};
auto Mangle = [&](ObjCKind Kind, StringRef ClassName) -> std::string {
SmallString<40> Mangled;
auto Prefix = getClassSymbolPrefix(Kind, OCD->getASTContext());
llvm::Mangler::getNameWithPrefix(Mangled, Prefix + ClassName, DL);
return Mangled.str();
};
return {
Mangle(ObjCClass, ClassName),
Mangle(ObjCMetaclass, ClassName),
};
}
std::vector<std::string> getAllManglings(const Decl *D) {
if (const auto *OCD = dyn_cast<ObjCContainerDecl>(D))
return getAllManglings(OCD);
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(ObjCClass, D->getASTContext());
OS << D->getObjCRuntimeNameAsString();
}
static StringRef getClassSymbolPrefix(ObjCKind Kind, const ASTContext &Context) {
if (Context.getLangOpts().ObjCRuntime.isGNUFamily())
return Kind == ObjCMetaclass ? "_OBJC_METACLASS_" : "_OBJC_CLASS_";
return Kind == ObjCMetaclass ? "OBJC_METACLASS_$_" : "OBJC_CLASS_$_";
}
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);
}
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