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