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 "CGDebugInfo.h" 16 #include "CodeGenModule.h" 17 #include "clang/AST/ASTContext.h" 18 #include "clang/AST/DeclObjC.h" 19 #include "clang/AST/Expr.h" 20 #include "clang/Basic/Diagnostic.h" 21 #include "clang/Basic/TargetInfo.h" 22 #include "clang/Frontend/CodeGenOptions.h" 23 #include "llvm/ADT/StringRef.h" 24 #include "llvm/IR/DataLayout.h" 25 #include "llvm/IR/LLVMContext.h" 26 #include "llvm/IR/Module.h" 27 #include <memory> 28 using namespace clang; 29 30 namespace { 31 class CodeGeneratorImpl : public CodeGenerator { 32 DiagnosticsEngine &Diags; 33 std::unique_ptr<const llvm::DataLayout> TD; 34 ASTContext *Ctx; 35 const CodeGenOptions CodeGenOpts; // Intentionally copied in. 36 protected: 37 std::unique_ptr<llvm::Module> M; 38 std::unique_ptr<CodeGen::CodeGenModule> Builder; 39 40 public: 41 CodeGeneratorImpl(DiagnosticsEngine &diags, const std::string& ModuleName, 42 const CodeGenOptions &CGO, llvm::LLVMContext& C) 43 : Diags(diags), CodeGenOpts(CGO), 44 M(new llvm::Module(ModuleName, C)) {} 45 46 virtual ~CodeGeneratorImpl() {} 47 48 virtual llvm::Module* GetModule() { 49 return M.get(); 50 } 51 52 virtual llvm::Module *ReleaseModule() { return M.release(); } 53 54 virtual void Initialize(ASTContext &Context) { 55 Ctx = &Context; 56 57 M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple()); 58 M->setDataLayout(Ctx->getTargetInfo().getTargetDescription()); 59 TD.reset(new llvm::DataLayout(Ctx->getTargetInfo().getTargetDescription())); 60 Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts, *M, *TD, 61 Diags)); 62 63 for (size_t i = 0, e = CodeGenOpts.DependentLibraries.size(); i < e; ++i) 64 HandleDependentLibrary(CodeGenOpts.DependentLibraries[i]); 65 } 66 67 virtual void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) { 68 if (Diags.hasErrorOccurred()) 69 return; 70 71 Builder->HandleCXXStaticMemberVarInstantiation(VD); 72 } 73 74 virtual bool HandleTopLevelDecl(DeclGroupRef DG) { 75 if (Diags.hasErrorOccurred()) 76 return true; 77 78 // Make sure to emit all elements of a Decl. 79 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 80 Builder->EmitTopLevelDecl(*I); 81 return true; 82 } 83 84 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl 85 /// to (e.g. struct, union, enum, class) is completed. This allows the 86 /// client hack on the type, which can occur at any point in the file 87 /// (because these can be defined in declspecs). 88 virtual void HandleTagDeclDefinition(TagDecl *D) { 89 if (Diags.hasErrorOccurred()) 90 return; 91 92 Builder->UpdateCompletedType(D); 93 94 // In C++, we may have member functions that need to be emitted at this 95 // point. 96 if (Ctx->getLangOpts().CPlusPlus && !D->isDependentContext()) { 97 for (auto *M : D->decls()) 98 if (auto *Method = dyn_cast<CXXMethodDecl>(M)) 99 if (Method->doesThisDeclarationHaveABody() && 100 (Method->hasAttr<UsedAttr>() || 101 Method->hasAttr<ConstructorAttr>())) 102 Builder->EmitTopLevelDecl(Method); 103 } 104 } 105 106 virtual void HandleTagDeclRequiredDefinition(const TagDecl *D) override { 107 if (Diags.hasErrorOccurred()) 108 return; 109 110 if (CodeGen::CGDebugInfo *DI = Builder->getModuleDebugInfo()) 111 if (const RecordDecl *RD = dyn_cast<RecordDecl>(D)) 112 DI->completeRequiredType(RD); 113 } 114 115 virtual void HandleTranslationUnit(ASTContext &Ctx) { 116 if (Diags.hasErrorOccurred()) { 117 if (Builder) 118 Builder->clear(); 119 M.reset(); 120 return; 121 } 122 123 if (Builder) 124 Builder->Release(); 125 } 126 127 virtual void CompleteTentativeDefinition(VarDecl *D) { 128 if (Diags.hasErrorOccurred()) 129 return; 130 131 Builder->EmitTentativeDefinition(D); 132 } 133 134 virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) { 135 if (Diags.hasErrorOccurred()) 136 return; 137 138 Builder->EmitVTable(RD, DefinitionRequired); 139 } 140 141 virtual void HandleLinkerOptionPragma(llvm::StringRef Opts) { 142 Builder->AppendLinkerOptions(Opts); 143 } 144 145 virtual void HandleDetectMismatch(llvm::StringRef Name, 146 llvm::StringRef Value) { 147 Builder->AddDetectMismatch(Name, Value); 148 } 149 150 virtual void HandleDependentLibrary(llvm::StringRef Lib) { 151 Builder->AddDependentLib(Lib); 152 } 153 }; 154 } 155 156 void CodeGenerator::anchor() { } 157 158 CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags, 159 const std::string& ModuleName, 160 const CodeGenOptions &CGO, 161 const TargetOptions &/*TO*/, 162 llvm::LLVMContext& C) { 163 return new CodeGeneratorImpl(Diags, ModuleName, CGO, C); 164 } 165