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//===--- ModuleBuilder.cpp - Emit LLVM Code from ASTs ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This builds an AST and converts it to LLVM Code.
//
//===----------------------------------------------------------------------===//
#include "clang/CodeGen/ModuleBuilder.h"
#include "CGDebugInfo.h"
#include "CodeGenModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include <memory>
using namespace clang;
namespace {
class CodeGeneratorImpl : public CodeGenerator {
DiagnosticsEngine &Diags;
std::unique_ptr<const llvm::DataLayout> TD;
ASTContext *Ctx;
const CodeGenOptions CodeGenOpts; // Intentionally copied in.
protected:
std::unique_ptr<llvm::Module> M;
std::unique_ptr<CodeGen::CodeGenModule> Builder;
public:
CodeGeneratorImpl(DiagnosticsEngine &diags, const std::string& ModuleName,
const CodeGenOptions &CGO, llvm::LLVMContext& C)
: Diags(diags), CodeGenOpts(CGO),
M(new llvm::Module(ModuleName, C)) {}
virtual ~CodeGeneratorImpl() {}
llvm::Module* GetModule() override {
return M.get();
}
const Decl *GetDeclForMangledName(StringRef MangledName) override {
GlobalDecl Result;
if (!Builder->lookupRepresentativeDecl(MangledName, Result))
return nullptr;
const Decl *D = Result.getCanonicalDecl().getDecl();
if (auto FD = dyn_cast<FunctionDecl>(D)) {
if (FD->hasBody(FD))
return FD;
} else if (auto TD = dyn_cast<TagDecl>(D)) {
if (auto Def = TD->getDefinition())
return Def;
}
return D;
}
llvm::Module *ReleaseModule() override { return M.release(); }
void Initialize(ASTContext &Context) override {
Ctx = &Context;
M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple());
M->setDataLayout(Ctx->getTargetInfo().getTargetDescription());
TD.reset(new llvm::DataLayout(Ctx->getTargetInfo().getTargetDescription()));
Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts, *M, *TD,
Diags));
for (size_t i = 0, e = CodeGenOpts.DependentLibraries.size(); i < e; ++i)
HandleDependentLibrary(CodeGenOpts.DependentLibraries[i]);
}
void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) override {
if (Diags.hasErrorOccurred())
return;
Builder->HandleCXXStaticMemberVarInstantiation(VD);
}
bool HandleTopLevelDecl(DeclGroupRef DG) override {
if (Diags.hasErrorOccurred())
return true;
// Make sure to emit all elements of a Decl.
for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
Builder->EmitTopLevelDecl(*I);
// Emit any deferred inline method definitions.
for (CXXMethodDecl *MD : DeferredInlineMethodDefinitions)
Builder->EmitTopLevelDecl(MD);
DeferredInlineMethodDefinitions.clear();
return true;
}
void HandleInlineMethodDefinition(CXXMethodDecl *D) override {
if (Diags.hasErrorOccurred())
return;
assert(D->doesThisDeclarationHaveABody());
// We may want to emit this definition. However, that decision might be
// based on computing the linkage, and we have to defer that in case we
// are inside of something that will change the method's final linkage,
// e.g.
// typedef struct {
// void bar();
// void foo() { bar(); }
// } A;
DeferredInlineMethodDefinitions.push_back(D);
}
/// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
/// to (e.g. struct, union, enum, class) is completed. This allows the
/// client hack on the type, which can occur at any point in the file
/// (because these can be defined in declspecs).
void HandleTagDeclDefinition(TagDecl *D) override {
if (Diags.hasErrorOccurred())
return;
Builder->UpdateCompletedType(D);
// For MSVC compatibility, treat declarations of static data members with
// inline initializers as definitions.
if (Ctx->getLangOpts().MSVCCompat) {
for (Decl *Member : D->decls()) {
if (VarDecl *VD = dyn_cast<VarDecl>(Member)) {
if (Ctx->isMSStaticDataMemberInlineDefinition(VD) &&
Ctx->DeclMustBeEmitted(VD)) {
Builder->EmitGlobal(VD);
}
}
}
}
}
void HandleTagDeclRequiredDefinition(const TagDecl *D) override {
if (Diags.hasErrorOccurred())
return;
if (CodeGen::CGDebugInfo *DI = Builder->getModuleDebugInfo())
if (const RecordDecl *RD = dyn_cast<RecordDecl>(D))
DI->completeRequiredType(RD);
}
void HandleTranslationUnit(ASTContext &Ctx) override {
if (Diags.hasErrorOccurred()) {
if (Builder)
Builder->clear();
M.reset();
return;
}
if (Builder)
Builder->Release();
}
void CompleteTentativeDefinition(VarDecl *D) override {
if (Diags.hasErrorOccurred())
return;
Builder->EmitTentativeDefinition(D);
}
void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) override {
if (Diags.hasErrorOccurred())
return;
Builder->EmitVTable(RD, DefinitionRequired);
}
void HandleLinkerOptionPragma(llvm::StringRef Opts) override {
Builder->AppendLinkerOptions(Opts);
}
void HandleDetectMismatch(llvm::StringRef Name,
llvm::StringRef Value) override {
Builder->AddDetectMismatch(Name, Value);
}
void HandleDependentLibrary(llvm::StringRef Lib) override {
Builder->AddDependentLib(Lib);
}
private:
std::vector<CXXMethodDecl *> DeferredInlineMethodDefinitions;
};
}
void CodeGenerator::anchor() { }
CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags,
const std::string& ModuleName,
const CodeGenOptions &CGO,
const TargetOptions &/*TO*/,
llvm::LLVMContext& C) {
return new CodeGeneratorImpl(Diags, ModuleName, CGO, C);
}
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