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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 "CodeGenModule.h"
#include "clang/Frontend/CodeGenOptions.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 "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Target/TargetData.h"
#include "llvm/ADT/OwningPtr.h"
using namespace clang;
namespace {
class CodeGeneratorImpl : public CodeGenerator {
DiagnosticsEngine &Diags;
OwningPtr<const llvm::TargetData> TD;
ASTContext *Ctx;
const CodeGenOptions CodeGenOpts; // Intentionally copied in.
protected:
OwningPtr<llvm::Module> M;
OwningPtr<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() {}
virtual llvm::Module* GetModule() {
return M.get();
}
virtual llvm::Module* ReleaseModule() {
return M.take();
}
virtual void Initialize(ASTContext &Context) {
Ctx = &Context;
M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple());
M->setDataLayout(Ctx->getTargetInfo().getTargetDescription());
TD.reset(new llvm::TargetData(Ctx->getTargetInfo().getTargetDescription()));
Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts,
*M, *TD, Diags));
}
virtual void MarkVarRequired(VarDecl *VD) {
Builder->MarkVarRequired(VD);
}
virtual bool HandleTopLevelDecl(DeclGroupRef DG) {
// Make sure to emit all elements of a Decl.
for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
Builder->EmitTopLevelDecl(*I);
return true;
}
/// 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).
virtual void HandleTagDeclDefinition(TagDecl *D) {
Builder->UpdateCompletedType(D);
// In C++, we may have member functions that need to be emitted at this
// point.
if (Ctx->getLangOptions().CPlusPlus && !D->isDependentContext()) {
for (DeclContext::decl_iterator M = D->decls_begin(),
MEnd = D->decls_end();
M != MEnd; ++M)
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*M))
if (Method->doesThisDeclarationHaveABody() &&
(Method->hasAttr<UsedAttr>() ||
Method->hasAttr<ConstructorAttr>()))
Builder->EmitTopLevelDecl(Method);
}
}
virtual void HandleTranslationUnit(ASTContext &Ctx) {
if (Diags.hasErrorOccurred()) {
M.reset();
return;
}
if (Builder)
Builder->Release();
}
virtual void CompleteTentativeDefinition(VarDecl *D) {
if (Diags.hasErrorOccurred())
return;
Builder->EmitTentativeDefinition(D);
}
virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) {
if (Diags.hasErrorOccurred())
return;
Builder->EmitVTable(RD, DefinitionRequired);
}
};
}
void CodeGenerator::anchor() { }
CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags,
const std::string& ModuleName,
const CodeGenOptions &CGO,
llvm::LLVMContext& C) {
return new CodeGeneratorImpl(Diags, ModuleName, CGO, C);
}