CodeGenTBAA.h revision 3d5aff5d3036b0ff09d114857cd2276134b3d8c9 
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 CGCXXABI;
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
42  /// MetadataCache - This maps clang::Types to llvm::MDNodes describing them.
43  llvm::DenseMap<const Type *, llvm::MDNode *> MetadataCache;
44
45  /// Root - This is the mdnode for the root of the metadata type graph
46  /// for this translation unit.
47  llvm::MDNode *Root;
48
49  /// Char - This is the mdnode for "char", which is special, and any types
50  /// considered to be equivalent to it.
51  llvm::MDNode *Char;
52
53  llvm::MDNode *getTBAAInfoForNamedType(const char *NameStr,
54                                        llvm::MDNode *Parent);
55
56public:
57  CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext &VMContext,
58              const LangOptions &Features);
59  ~CodeGenTBAA();
60
61  llvm::MDNode *getTBAAInfo(QualType QTy);
62};
63
64}  // end namespace CodeGen
65}  // end namespace clang
66
67#endif
68