1 //===--- ModuleBuilder.cpp - Emit LLVM Code from ASTs ---------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This builds an AST and converts it to LLVM Code. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/CodeGen/ModuleBuilder.h" 15 #include "CodeGenModule.h" 16 #include "clang/AST/ASTConsumer.h" 17 #include "clang/AST/ASTContext.h" 18 #include "clang/AST/Decl.h" 19 using namespace clang; 20 21 //===----------------------------------------------------------------------===// 22 // LLVM Emitter 23 24 #include "clang/Basic/Diagnostic.h" 25 #include "clang/Basic/TargetInfo.h" 26 #include "clang/CodeGen/ModuleBuilder.h" 27 #include "llvm/Module.h" 28 #include "llvm/Target/TargetData.h" 29 #include "llvm/Target/TargetMachine.h" 30 31 namespace { 32 class CodeGenerator : public ASTConsumer { 33 Diagnostic &Diags; 34 const llvm::TargetData *TD; 35 ASTContext *Ctx; 36 const LangOptions &Features; 37 bool GenerateDebugInfo; 38 protected: 39 llvm::Module *&M; 40 CodeGen::CodeGenModule *Builder; 41 public: 42 CodeGenerator(Diagnostic &diags, const LangOptions &LO, 43 llvm::Module *&DestModule, bool DebugInfoFlag) 44 : Diags(diags), Features(LO), GenerateDebugInfo(DebugInfoFlag), 45 M(DestModule) {} 46 47 ~CodeGenerator() { 48 delete Builder; 49 delete TD; 50 } 51 52 virtual void Initialize(ASTContext &Context) { 53 Ctx = &Context; 54 55 M->setTargetTriple(Ctx->Target.getTargetTriple()); 56 M->setDataLayout(Ctx->Target.getTargetDescription()); 57 TD = new llvm::TargetData(Ctx->Target.getTargetDescription()); 58 Builder = new CodeGen::CodeGenModule(Context, Features, *M, *TD, Diags, 59 GenerateDebugInfo); 60 } 61 62 virtual void HandleTopLevelDecl(Decl *D) { 63 // If an error occurred, stop code generation, but continue parsing and 64 // semantic analysis (to ensure all warnings and errors are emitted). 65 if (Diags.hasErrorOccurred()) 66 return; 67 68 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 69 Builder->EmitFunction(FD); 70 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { 71 if (VD->isFileVarDecl()) 72 Builder->EmitGlobalVarDeclarator(VD); 73 } else if (isa<ObjCClassDecl>(D) || isa<ObjCCategoryDecl>(D)) { 74 // Forward declaration. Only used for type checking. 75 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 76 Builder->EmitObjCMethod(OMD); 77 } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) { 78 if (LSD->getLanguage() == LinkageSpecDecl::lang_cxx) 79 Builder->WarnUnsupported(LSD, "linkage spec"); 80 // FIXME: implement C++ linkage, C linkage works mostly by C 81 // language reuse already. 82 } else if (FileScopeAsmDecl *AD = dyn_cast<FileScopeAsmDecl>(D)) { 83 std::string AsmString(AD->getAsmString()->getStrData(), 84 AD->getAsmString()->getByteLength()); 85 86 const std::string &S = Builder->getModule().getModuleInlineAsm(); 87 if (S.empty()) 88 Builder->getModule().setModuleInlineAsm(AsmString); 89 else 90 Builder->getModule().setModuleInlineAsm(S + '\n' + AsmString); 91 } else { 92 assert(isa<TypeDecl>(D) && "Unknown top level decl"); 93 // TODO: handle debug info? 94 } 95 } 96 97 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl 98 /// (e.g. struct, union, enum, class) is completed. This allows the client to 99 /// hack on the type, which can occur at any point in the file (because these 100 /// can be defined in declspecs). 101 virtual void HandleTagDeclDefinition(TagDecl *D) { 102 Builder->UpdateCompletedType(D); 103 } 104 105 }; 106 } 107 108 ASTConsumer *clang::CreateLLVMCodeGen(Diagnostic &Diags, 109 const LangOptions &Features, 110 llvm::Module *&DestModule, 111 bool GenerateDebugInfo) { 112 return new CodeGenerator(Diags, Features, DestModule, GenerateDebugInfo); 113 } 114 115