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397937fa0d
1. Take a flags argument instead of a bool. This makes it more clear to the reader what it is used for. 2. Add a flag that says that "remapping a value not in the map is ok". 3. Reimplement MapValue to share a bunch of code and be a lot more efficient. For lookup failures, don't drop null values into the map. 4. Using the new flag a bunch of code can vaporize in LinkModules and LoopUnswitch, kill it. No functionality change. llvm-svn: 123058
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
//===- ValueMapper.h - Remapping for constants and metadata -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MapValue interface which is used by various parts of
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// the Transforms/Utils library to implement cloning and linking facilities.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_VALUEMAPPER_H
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#define LLVM_TRANSFORMS_UTILS_VALUEMAPPER_H
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#include "llvm/ADT/ValueMap.h"
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namespace llvm {
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class Value;
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class Instruction;
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typedef ValueMap<const Value *, TrackingVH<Value> > ValueToValueMapTy;
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/// RemapFlags - These are flags that the value mapping APIs allow.
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enum RemapFlags {
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RF_None = 0,
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/// RF_NoModuleLevelChanges - If this flag is set, the remapper knows that
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/// only local values within a function (such as an instruction or argument)
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/// are mapped, not global values like functions and global metadata.
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RF_NoModuleLevelChanges = 1,
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/// RF_IgnoreMissingEntries - If this flag is set, the remapper ignores
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/// entries that are not in the value map. If it is unset, it aborts if an
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/// operand is asked to be remapped which doesn't exist in the mapping.
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RF_IgnoreMissingEntries = 2
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};
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static inline RemapFlags operator|(RemapFlags LHS, RemapFlags RHS) {
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return RemapFlags(unsigned(LHS)|unsigned(RHS));
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}
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Value *MapValue(const Value *V, ValueToValueMapTy &VM,
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RemapFlags Flags = RF_None);
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void RemapInstruction(Instruction *I, ValueToValueMapTy &VM,
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RemapFlags Flags = RF_None);
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} // End llvm namespace
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#endif
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