ModuleBuilder.cpp revision 193326 
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/Frontend/CompileOptions.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 "llvm/Module.h"
23#include "llvm/Target/TargetData.h"
24#include "llvm/Support/Compiler.h"
25#include "llvm/ADT/OwningPtr.h"
26using namespace clang;
27
28
29namespace {
30  class VISIBILITY_HIDDEN CodeGeneratorImpl : public CodeGenerator {
31    Diagnostic &Diags;
32    llvm::OwningPtr<const llvm::TargetData> TD;
33    ASTContext *Ctx;
34    const CompileOptions CompileOpts;  // Intentionally copied in.
35  protected:
36    llvm::OwningPtr<llvm::Module> M;
37    llvm::OwningPtr<CodeGen::CodeGenModule> Builder;
38  public:
39    CodeGeneratorImpl(Diagnostic &diags, const std::string& ModuleName,
40                      const CompileOptions &CO)
41      : Diags(diags), CompileOpts(CO), M(new llvm::Module(ModuleName)) {}
42
43    virtual ~CodeGeneratorImpl() {}
44
45    virtual llvm::Module* GetModule() {
46      return M.get();
47    }
48
49    virtual llvm::Module* ReleaseModule() {
50      return M.take();
51    }
52
53    virtual void Initialize(ASTContext &Context) {
54      Ctx = &Context;
55
56      M->setTargetTriple(Ctx->Target.getTargetTriple());
57      M->setDataLayout(Ctx->Target.getTargetDescription());
58      TD.reset(new llvm::TargetData(Ctx->Target.getTargetDescription()));
59      Builder.reset(new CodeGen::CodeGenModule(Context, CompileOpts,
60                                               *M, *TD, Diags));
61    }
62
63    virtual void HandleTopLevelDecl(DeclGroupRef DG) {
64      // Make sure to emit all elements of a Decl.
65      for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
66        Builder->EmitTopLevelDecl(*I);
67    }
68
69    /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
70    /// to (e.g. struct, union, enum, class) is completed. This allows the
71    /// client hack on the type, which can occur at any point in the file
72    /// (because these can be defined in declspecs).
73    virtual void HandleTagDeclDefinition(TagDecl *D) {
74      Builder->UpdateCompletedType(D);
75    }
76
77    virtual void HandleTranslationUnit(ASTContext &Ctx) {
78      if (Diags.hasErrorOccurred()) {
79        M.reset();
80        return;
81      }
82
83      if (Builder)
84        Builder->Release();
85    };
86
87    virtual void CompleteTentativeDefinition(VarDecl *D) {
88      if (Diags.hasErrorOccurred())
89        return;
90
91      Builder->EmitTentativeDefinition(D);
92    }
93  };
94}
95
96CodeGenerator *clang::CreateLLVMCodeGen(Diagnostic &Diags,
97                                        const std::string& ModuleName,
98                                        const CompileOptions &CO) {
99  return new CodeGeneratorImpl(Diags, ModuleName, CO);
100}
101