forked from OSchip/llvm-project
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
//===--- ModuleBuilder.cpp - Emit LLVM Code from ASTs ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This builds an AST and converts it to LLVM Code.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/CodeGen/ModuleBuilder.h"
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#include "CodeGenModule.h"
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#include "clang/Frontend/CodeGenOptions.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Expr.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/TargetInfo.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/ADT/OwningPtr.h"
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using namespace clang;
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namespace {
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class CodeGeneratorImpl : public CodeGenerator {
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DiagnosticsEngine &Diags;
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OwningPtr<const llvm::TargetData> TD;
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ASTContext *Ctx;
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const CodeGenOptions CodeGenOpts; // Intentionally copied in.
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protected:
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OwningPtr<llvm::Module> M;
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OwningPtr<CodeGen::CodeGenModule> Builder;
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public:
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CodeGeneratorImpl(DiagnosticsEngine &diags, const std::string& ModuleName,
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const CodeGenOptions &CGO, llvm::LLVMContext& C)
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: Diags(diags), CodeGenOpts(CGO), M(new llvm::Module(ModuleName, C)) {}
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virtual ~CodeGeneratorImpl() {}
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virtual llvm::Module* GetModule() {
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return M.get();
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}
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virtual llvm::Module* ReleaseModule() {
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return M.take();
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}
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virtual void Initialize(ASTContext &Context) {
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Ctx = &Context;
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M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple());
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M->setDataLayout(Ctx->getTargetInfo().getTargetDescription());
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TD.reset(new llvm::TargetData(Ctx->getTargetInfo().getTargetDescription()));
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Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts,
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*M, *TD, Diags));
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}
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virtual void MarkVarRequired(VarDecl *VD) {
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Builder->MarkVarRequired(VD);
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}
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virtual bool HandleTopLevelDecl(DeclGroupRef DG) {
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// Make sure to emit all elements of a Decl.
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for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
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Builder->EmitTopLevelDecl(*I);
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return true;
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}
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/// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
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/// to (e.g. struct, union, enum, class) is completed. This allows the
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/// client hack on the type, which can occur at any point in the file
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/// (because these can be defined in declspecs).
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virtual void HandleTagDeclDefinition(TagDecl *D) {
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Builder->UpdateCompletedType(D);
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// In C++, we may have member functions that need to be emitted at this
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// point.
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if (Ctx->getLangOptions().CPlusPlus && !D->isDependentContext()) {
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for (DeclContext::decl_iterator M = D->decls_begin(),
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MEnd = D->decls_end();
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M != MEnd; ++M)
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if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*M))
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if (Method->doesThisDeclarationHaveABody() &&
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(Method->hasAttr<UsedAttr>() ||
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Method->hasAttr<ConstructorAttr>()))
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Builder->EmitTopLevelDecl(Method);
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}
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}
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virtual void HandleTranslationUnit(ASTContext &Ctx) {
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if (Diags.hasErrorOccurred()) {
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M.reset();
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return;
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}
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if (Builder)
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Builder->Release();
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}
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virtual void CompleteTentativeDefinition(VarDecl *D) {
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if (Diags.hasErrorOccurred())
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return;
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Builder->EmitTentativeDefinition(D);
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}
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virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) {
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if (Diags.hasErrorOccurred())
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return;
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Builder->EmitVTable(RD, DefinitionRequired);
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}
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};
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}
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void CodeGenerator::anchor() { }
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CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags,
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const std::string& ModuleName,
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const CodeGenOptions &CGO,
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llvm::LLVMContext& C) {
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return new CodeGeneratorImpl(Diags, ModuleName, CGO, C);
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}
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