CodeGenTBAA.h revision 0b5c4fc2ae3b503c2b1f354bf52b718aa50a6aee 
1//===--- CodeGenTBAA.h - TBAA information for LLVM CodeGen ------*- C++ -*-===//
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 is the code that manages TBAA information.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef CLANG_CODEGEN_CODEGENTBAA_H
15#define CLANG_CODEGEN_CODEGENTBAA_H
16
17#include "llvm/LLVMContext.h"
18#include "llvm/ADT/DenseMap.h"
19
20namespace llvm {
21  class LLVMContext;
22  class MDNode;
23}
24
25namespace clang {
26  class ASTContext;
27  class LangOptions;
28  class QualType;
29  class Type;
30
31namespace CodeGen {
32  class MangleContext;
33  class CGRecordLayout;
34
35/// CodeGenTBAA - This class organizes the cross-module state that is used
36/// while lowering AST types to LLVM types.
37class CodeGenTBAA {
38  ASTContext &Context;
39  llvm::LLVMContext& VMContext;
40  const LangOptions &Features;
41  MangleContext &MContext;
42
43  /// MetadataCache - This maps clang::Types to llvm::MDNodes describing them.
44  llvm::DenseMap<const Type *, llvm::MDNode *> MetadataCache;
45
46  /// Root - This is the mdnode for the root of the metadata type graph
47  /// for this translation unit.
48  llvm::MDNode *Root;
49
50  /// Char - This is the mdnode for "char", which is special, and any types
51  /// considered to be equivalent to it.
52  llvm::MDNode *Char;
53
54  llvm::MDNode *getTBAAInfoForNamedType(llvm::StringRef NameStr,
55                                        llvm::MDNode *Parent);
56
57public:
58  CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext &VMContext,
59              const LangOptions &Features,
60              MangleContext &MContext);
61  ~CodeGenTBAA();
62
63  llvm::MDNode *getTBAAInfo(QualType QTy);
64};
65
66}  // end namespace CodeGen
67}  // end namespace clang
68
69#endif
70