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//===- LazyValueInfo.h - Value constraint analysis --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interface for lazy computation of value constraint
// information.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_LIVEVALUES_H
#define LLVM_ANALYSIS_LIVEVALUES_H
#include "llvm/Pass.h"
namespace llvm {
class Constant;
class TargetData;
class Value;
/// LazyValueInfo - This pass computes, caches, and vends lazy value constraint
/// information.
class LazyValueInfo : public FunctionPass {
class TargetData *TD;
void *PImpl;
public:
static char ID;
LazyValueInfo() : FunctionPass(&ID), PImpl(0) {}
/// Tristate - This is used to return yes/no/dunno results.
enum Tristate {
Unknown = -1, No = 0, Yes = 1
};
// Public query interface.
/// isEqual - Determine whether the specified value is known to be equal or
/// not-equal to the specified constant at the end of the specified block.
Tristate isEqual(Value *V, Constant *C, BasicBlock *BB);
/// getConstant - Determine whether the specified value is known to be a
/// constant at the end of the specified block. Return null if not.
Constant *getConstant(Value *V, BasicBlock *BB);
// Implementation boilerplate.
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
virtual void releaseMemory();
virtual bool runOnFunction(Function &F);
};
} // end namespace llvm
#endif
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