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 "clang/Basic/LLVM.h" 19 #include "llvm/ADT/DenseMap.h" 20 21 namespace llvm { 22 class LLVMContext; 23 class MDNode; 24 } 25 26 namespace clang { 27 class ASTContext; 28 class LangOptions; 29 class MangleContext; 30 class QualType; 31 class Type; 32 33 namespace CodeGen { 34 class CGRecordLayout; 35 36 /// CodeGenTBAA - This class organizes the cross-module state that is used 37 /// while lowering AST types to LLVM types. 38 class 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 llvm::MDNode *Root; 48 llvm::MDNode *Char; 49 50 /// getRoot - This is the mdnode for the root of the metadata type graph 51 /// for this translation unit. 52 llvm::MDNode *getRoot(); 53 54 /// getChar - This is the mdnode for "char", which is special, and any types 55 /// considered to be equivalent to it. 56 llvm::MDNode *getChar(); 57 58 llvm::MDNode *getTBAAInfoForNamedType(StringRef NameStr, 59 llvm::MDNode *Parent, 60 bool Readonly = false); 61 62 public: 63 CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext &VMContext, 64 const LangOptions &Features, 65 MangleContext &MContext); 66 ~CodeGenTBAA(); 67 68 /// getTBAAInfo - Get the TBAA MDNode to be used for a dereference 69 /// of the given type. 70 llvm::MDNode *getTBAAInfo(QualType QTy); 71 }; 72 73 } // end namespace CodeGen 74 } // end namespace clang 75 76 #endif 77
