1 //===- ValueMapper.h - Remapping for constants and metadata -----*- 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 file defines the MapValue interface which is used by various parts of 11 // the Transforms/Utils library to implement cloning and linking facilities. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_TRANSFORMS_UTILS_VALUEMAPPER_H 16 #define LLVM_TRANSFORMS_UTILS_VALUEMAPPER_H 17 18 #include "llvm/ADT/ValueMap.h" 19 20 namespace llvm { 21 class Value; 22 class Instruction; 23 typedef ValueMap<const Value *, TrackingVH<Value> > ValueToValueMapTy; 24 25 /// ValueMapTypeRemapper - This is a class that can be implemented by clients 26 /// to remap types when cloning constants and instructions. 27 class ValueMapTypeRemapper { 28 virtual void Anchor(); // Out of line method. 29 public: 30 virtual ~ValueMapTypeRemapper() {} 31 32 /// remapType - The client should implement this method if they want to 33 /// remap types while mapping values. 34 virtual Type *remapType(Type *SrcTy) = 0; 35 }; 36 37 /// RemapFlags - These are flags that the value mapping APIs allow. 38 enum RemapFlags { 39 RF_None = 0, 40 41 /// RF_NoModuleLevelChanges - If this flag is set, the remapper knows that 42 /// only local values within a function (such as an instruction or argument) 43 /// are mapped, not global values like functions and global metadata. 44 RF_NoModuleLevelChanges = 1, 45 46 /// RF_IgnoreMissingEntries - If this flag is set, the remapper ignores 47 /// entries that are not in the value map. If it is unset, it aborts if an 48 /// operand is asked to be remapped which doesn't exist in the mapping. 49 RF_IgnoreMissingEntries = 2 50 }; 51 52 static inline RemapFlags operator|(RemapFlags LHS, RemapFlags RHS) { 53 return RemapFlags(unsigned(LHS)|unsigned(RHS)); 54 } 55 56 Value *MapValue(const Value *V, ValueToValueMapTy &VM, 57 RemapFlags Flags = RF_None, 58 ValueMapTypeRemapper *TypeMapper = 0); 59 60 void RemapInstruction(Instruction *I, ValueToValueMapTy &VM, 61 RemapFlags Flags = RF_None, 62 ValueMapTypeRemapper *TypeMapper = 0); 63 64 /// MapValue - provide versions that preserve type safety for MDNode and 65 /// Constants. 66 inline MDNode *MapValue(const MDNode *V, ValueToValueMapTy &VM, 67 RemapFlags Flags = RF_None, 68 ValueMapTypeRemapper *TypeMapper = 0) { 69 return cast<MDNode>(MapValue((const Value*)V, VM, Flags, TypeMapper)); 70 } 71 inline Constant *MapValue(const Constant *V, ValueToValueMapTy &VM, 72 RemapFlags Flags = RF_None, 73 ValueMapTypeRemapper *TypeMapper = 0) { 74 return cast<Constant>(MapValue((const Value*)V, VM, Flags, TypeMapper)); 75 } 76 77 78 } // End llvm namespace 79 80 #endif 81
