CodeGenTBAA.h revision 565cc44bea707ff3865fbeb731e4790dd9874786 
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 and defines the TBAA policy
11// for the optimizer to use.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef CLANG_CODEGEN_CODEGENTBAA_H
16#define CLANG_CODEGEN_CODEGENTBAA_H
17
18#include "llvm/LLVMContext.h"
19#include "llvm/ADT/DenseMap.h"
20
21namespace llvm {
22  class LLVMContext;
23  class MDNode;
24}
25
26namespace clang {
27  class ASTContext;
28  class LangOptions;
29  class QualType;
30  class Type;
31
32namespace CodeGen {
33  class MangleContext;
34  class CGRecordLayout;
35
36/// CodeGenTBAA - This class organizes the cross-module state that is used
37/// while lowering AST types to LLVM types.
38class CodeGenTBAA {
39  ASTContext &Context;
40  llvm::LLVMContext& VMContext;
41  const LangOptions &Features;
42  MangleContext &MContext;
43
44  /// MetadataCache - This maps clang::Types to llvm::MDNodes describing them.
45  llvm::DenseMap<const Type *, llvm::MDNode *> MetadataCache;
46
47  /// Root - This is the mdnode for the root of the metadata type graph
48  /// for this translation unit.
49  llvm::MDNode *Root;
50
51  /// Char - This is the mdnode for "char", which is special, and any types
52  /// considered to be equivalent to it.
53  llvm::MDNode *Char;
54
55  llvm::MDNode *getTBAAInfoForNamedType(llvm::StringRef NameStr,
56                                        llvm::MDNode *Parent);
57
58public:
59  CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext &VMContext,
60              const LangOptions &Features,
61              MangleContext &MContext);
62  ~CodeGenTBAA();
63
64  /// getTBAAInfo - Get the TBAA MDNode to be used for a dereference
65  /// of the given type.
66  llvm::MDNode *getTBAAInfo(QualType QTy);
67};
68
69}  // end namespace CodeGen
70}  // end namespace clang
71
72#endif
73