/usr/include/llvm-3.9/llvm/Analysis/LazyValueInfo.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | //===- 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_LAZYVALUEINFO_H
#define LLVM_ANALYSIS_LAZYVALUEINFO_H
#include "llvm/IR/PassManager.h"
#include "llvm/Pass.h"
namespace llvm {
class AssumptionCache;
class Constant;
class ConstantRange;
class DataLayout;
class DominatorTree;
class Instruction;
class TargetLibraryInfo;
class Value;
/// This pass computes, caches, and vends lazy value constraint information.
class LazyValueInfo {
friend class LazyValueInfoWrapperPass;
AssumptionCache *AC = nullptr;
class TargetLibraryInfo *TLI = nullptr;
DominatorTree *DT = nullptr;
void *PImpl = nullptr;
LazyValueInfo(const LazyValueInfo&) = delete;
void operator=(const LazyValueInfo&) = delete;
public:
~LazyValueInfo();
LazyValueInfo() {}
LazyValueInfo(AssumptionCache *AC_, TargetLibraryInfo *TLI_,
DominatorTree *DT_)
: AC(AC_), TLI(TLI_), DT(DT_) {}
LazyValueInfo(LazyValueInfo &&Arg)
: AC(Arg.AC), TLI(Arg.TLI), DT(Arg.DT), PImpl(Arg.PImpl) {
Arg.PImpl = nullptr;
}
LazyValueInfo &operator=(LazyValueInfo &&Arg) {
releaseMemory();
AC = Arg.AC;
TLI = Arg.TLI;
DT = Arg.DT;
PImpl = Arg.PImpl;
Arg.PImpl = nullptr;
return *this;
}
/// This is used to return true/false/dunno results.
enum Tristate {
Unknown = -1, False = 0, True = 1
};
// Public query interface.
/// Determine whether the specified value comparison with a constant is known
/// to be true or false on the specified CFG edge.
/// Pred is a CmpInst predicate.
Tristate getPredicateOnEdge(unsigned Pred, Value *V, Constant *C,
BasicBlock *FromBB, BasicBlock *ToBB,
Instruction *CxtI = nullptr);
/// Determine whether the specified value comparison with a constant is known
/// to be true or false at the specified instruction
/// (from an assume intrinsic). Pred is a CmpInst predicate.
Tristate getPredicateAt(unsigned Pred, Value *V, Constant *C,
Instruction *CxtI);
/// 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, Instruction *CxtI = nullptr);
/// Return the ConstantRange constraint that is known to hold for the
/// specified value at the end of the specified block. This may only be called
/// on integer-typed Values.
ConstantRange getConstantRange(Value *V, BasicBlock *BB, Instruction *CxtI = nullptr);
/// Determine whether the specified value is known to be a
/// constant on the specified edge. Return null if not.
Constant *getConstantOnEdge(Value *V, BasicBlock *FromBB, BasicBlock *ToBB,
Instruction *CxtI = nullptr);
/// Inform the analysis cache that we have threaded an edge from
/// PredBB to OldSucc to be from PredBB to NewSucc instead.
void threadEdge(BasicBlock *PredBB, BasicBlock *OldSucc, BasicBlock *NewSucc);
/// Inform the analysis cache that we have erased a block.
void eraseBlock(BasicBlock *BB);
// For old PM pass. Delete once LazyValueInfoWrapperPass is gone.
void releaseMemory();
};
/// \brief Analysis to compute lazy value information.
class LazyValueAnalysis : public AnalysisInfoMixin<LazyValueAnalysis> {
public:
typedef LazyValueInfo Result;
Result run(Function &F, FunctionAnalysisManager &FAM);
private:
static char PassID;
friend struct AnalysisInfoMixin<LazyValueAnalysis>;
};
/// Wrapper around LazyValueInfo.
class LazyValueInfoWrapperPass : public FunctionPass {
LazyValueInfoWrapperPass(const LazyValueInfoWrapperPass&) = delete;
void operator=(const LazyValueInfoWrapperPass&) = delete;
public:
static char ID;
LazyValueInfoWrapperPass() : FunctionPass(ID) {
initializeLazyValueInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}
~LazyValueInfoWrapperPass() override {
assert(!Info.PImpl && "releaseMemory not called");
}
LazyValueInfo &getLVI();
void getAnalysisUsage(AnalysisUsage &AU) const override;
void releaseMemory() override;
bool runOnFunction(Function &F) override;
private:
LazyValueInfo Info;
};
} // end namespace llvm
#endif
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