src/llvm/include/llvm/Transforms/Utils/ValueMapper.h

   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/IR/ValueMap.h"
  19
  20 namespace llvm {
  21   class Value;
  22   class Instruction;
  23   typedef ValueMap<const Value *, WeakVH> 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   /// ValueMaterializer - This is a class that can be implemented by clients
  38   /// to materialize Values on demand.
  39   class ValueMaterializer {
  40     virtual void anchor(); // Out of line method.
  41   public:
  42     virtual ~ValueMaterializer() {}
  43
  44     /// materializeValueFor - The client should implement this method if they
  45     /// want to generate a mapped Value on demand. For example, if linking
  46     /// lazily.
  47     virtual Value *materializeValueFor(Value *V) = 0;
  48   };
  49
  50   /// RemapFlags - These are flags that the value mapping APIs allow.
  51   enum RemapFlags {
  52     RF_None = 0,
  53
  54     /// RF_NoModuleLevelChanges - If this flag is set, the remapper knows that
  55     /// only local values within a function (such as an instruction or argument)
  56     /// are mapped, not global values like functions and global metadata.
  57     RF_NoModuleLevelChanges = 1,
  58
  59     /// RF_IgnoreMissingEntries - If this flag is set, the remapper ignores
  60     /// entries that are not in the value map.  If it is unset, it aborts if an
  61     /// operand is asked to be remapped which doesn't exist in the mapping.
  62     RF_IgnoreMissingEntries = 2
  63   };
  64
  65   static inline RemapFlags operator|(RemapFlags LHS, RemapFlags RHS) {
  66     return RemapFlags(unsigned(LHS)|unsigned(RHS));
  67   }
  68
  69   Value *MapValue(const Value *V, ValueToValueMapTy &VM,
  70                   RemapFlags Flags = RF_None,
  71                   ValueMapTypeRemapper *TypeMapper = nullptr,
  72                   ValueMaterializer *Materializer = nullptr);
  73
  74   Metadata *MapMetadata(const Metadata *MD, ValueToValueMapTy &VM,
  75                         RemapFlags Flags = RF_None,
  76                         ValueMapTypeRemapper *TypeMapper = nullptr,
  77                         ValueMaterializer *Materializer = nullptr);
  78
  79   /// MapMetadata - provide versions that preserve type safety for MDNodes.
  80   MDNode *MapMetadata(const MDNode *MD, ValueToValueMapTy &VM,
  81                       RemapFlags Flags = RF_None,
  82                       ValueMapTypeRemapper *TypeMapper = nullptr,
  83                       ValueMaterializer *Materializer = nullptr);
  84
  85   void RemapInstruction(Instruction *I, ValueToValueMapTy &VM,
  86                         RemapFlags Flags = RF_None,
  87                         ValueMapTypeRemapper *TypeMapper = nullptr,
  88                         ValueMaterializer *Materializer = nullptr);
  89
  90   /// MapValue - provide versions that preserve type safety for Constants.
  91   inline Constant *MapValue(const Constant *V, ValueToValueMapTy &VM,
  92                             RemapFlags Flags = RF_None,
  93                             ValueMapTypeRemapper *TypeMapper = nullptr,
  94                             ValueMaterializer *Materializer = nullptr) {
  95     return cast<Constant>(MapValue((const Value*)V, VM, Flags, TypeMapper,
  96                                    Materializer));
  97   }
  98
  99 } // End llvm namespace
 100
 101 #endif