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80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//===- LazyValueInfo.h - Value constraint analysis --------------*- 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 interface for lazy computation of value constraint
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// information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_LAZYVALUEINFO_H
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#define LLVM_ANALYSIS_LAZYVALUEINFO_H
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#include "llvm/Pass.h"
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namespace llvm {
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class Constant;
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class TargetData;
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class Value;
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/// LazyValueInfo - This pass computes, caches, and vends lazy value constraint
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/// information.
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class LazyValueInfo : public FunctionPass {
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class TargetData *TD;
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void *PImpl;
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LazyValueInfo(const LazyValueInfo&); // DO NOT IMPLEMENT.
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void operator=(const LazyValueInfo&); // DO NOT IMPLEMENT.
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public:
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static char ID;
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LazyValueInfo() : FunctionPass(ID), PImpl(0) {}
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~LazyValueInfo() { assert(PImpl == 0 && "releaseMemory not called"); }
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/// Tristate - This is used to return true/false/dunno results.
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enum Tristate {
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Unknown = -1, False = 0, True = 1
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};
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// Public query interface.
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/// getPredicateOnEdge - Determine whether the specified value comparison
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/// with a constant is known to be true or false on the specified CFG edge.
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/// Pred is a CmpInst predicate.
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Tristate getPredicateOnEdge(unsigned Pred, Value *V, Constant *C,
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BasicBlock *FromBB, BasicBlock *ToBB);
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/// getConstant - Determine whether the specified value is known to be a
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/// constant at the end of the specified block. Return null if not.
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Constant *getConstant(Value *V, BasicBlock *BB);
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/// getConstantOnEdge - Determine whether the specified value is known to be a
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/// constant on the specified edge. Return null if not.
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Constant *getConstantOnEdge(Value *V, BasicBlock *FromBB, BasicBlock *ToBB);
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/// threadEdge - Inform the analysis cache that we have threaded an edge from
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/// PredBB to OldSucc to be from PredBB to NewSucc instead.
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void threadEdge(BasicBlock *PredBB, BasicBlock *OldSucc, BasicBlock *NewSucc);
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/// eraseBlock - Inform the analysis cache that we have erased a block.
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void eraseBlock(BasicBlock *BB);
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// Implementation boilerplate.
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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virtual void releaseMemory();
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virtual bool runOnFunction(Function &F);
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};
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} // end namespace llvm
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#endif
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