Members/tobaru/cbc/CbC_llvm: include/llvm/Analysis/BasicAliasAnalysis.h annotate

annotate include/llvm/Analysis/BasicAliasAnalysis.h @ 128:c347d3398279 default tip

fix

author	mir3636
date	Wed, 06 Dec 2017 14:37:17 +0900
parents	803732b1fca8
children

rev	line source
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	1 //===- BasicAliasAnalysis.h - Stateless, local Alias Analysis ---- C++ --===//
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	2 //
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	3 // The LLVM Compiler Infrastructure
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	4 //
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	5 // This file is distributed under the University of Illinois Open Source
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	6 // License. See LICENSE.TXT for details.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	7 //
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	8 //===----------------------------------------------------------------------===//
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	9 /// \file
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	10 /// This is the interface for LLVM's primary stateless and local alias analysis.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	11 ///
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	12 //===----------------------------------------------------------------------===//
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	13
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	14 #ifndef LLVM_ANALYSIS_BASICALIASANALYSIS_H
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	15 #define LLVM_ANALYSIS_BASICALIASANALYSIS_H
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	16
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	17 #include "llvm/ADT/DenseMap.h"
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	18 #include "llvm/ADT/Optional.h"
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	19 #include "llvm/ADT/SmallPtrSet.h"
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	20 #include "llvm/ADT/SmallVector.h"
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	21 #include "llvm/Analysis/AliasAnalysis.h"
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	22 #include "llvm/Analysis/AssumptionCache.h"
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	23 #include "llvm/Analysis/MemoryLocation.h"
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	24 #include "llvm/IR/CallSite.h"
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	25 #include "llvm/IR/PassManager.h"
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	26 #include "llvm/Pass.h"
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	27 #include <algorithm>
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	28 #include <cstdint>
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	29 #include <memory>
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	30 #include <utility>
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	31
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	32 namespace llvm {
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	33
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	34 struct AAMDNodes;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	35 class APInt;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	36 class AssumptionCache;
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	37 class BasicBlock;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	38 class DataLayout;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	39 class DominatorTree;
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	40 class Function;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	41 class GEPOperator;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	42 class LoopInfo;
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	43 class PHINode;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	44 class SelectInst;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	45 class TargetLibraryInfo;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	46 class Value;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	47
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	48 /// This is the AA result object for the basic, local, and stateless alias
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	49 /// analysis. It implements the AA query interface in an entirely stateless
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	50 /// manner. As one consequence, it is never invalidated due to IR changes.
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	51 /// While it does retain some storage, that is used as an optimization and not
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	52 /// to preserve information from query to query. However it does retain handles
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	53 /// to various other analyses and must be recomputed when those analyses are.
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	54 class BasicAAResult : public AAResultBase<BasicAAResult> {
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	55 friend AAResultBase<BasicAAResult>;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	56
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	57 const DataLayout &DL;
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	58 const TargetLibraryInfo &TLI;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	59 AssumptionCache &AC;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	60 DominatorTree *DT;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	61 LoopInfo *LI;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	62
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	63 public:
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	64 BasicAAResult(const DataLayout &DL, const TargetLibraryInfo &TLI,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	65 AssumptionCache &AC, DominatorTree *DT = nullptr,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	66 LoopInfo *LI = nullptr)
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	67 : AAResultBase(), DL(DL), TLI(TLI), AC(AC), DT(DT), LI(LI) {}
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	68
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	69 BasicAAResult(const BasicAAResult &Arg)
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	70 : AAResultBase(Arg), DL(Arg.DL), TLI(Arg.TLI), AC(Arg.AC), DT(Arg.DT),
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	71 LI(Arg.LI) {}
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	72 BasicAAResult(BasicAAResult &&Arg)
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	73 : AAResultBase(std::move(Arg)), DL(Arg.DL), TLI(Arg.TLI), AC(Arg.AC),
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	74 DT(Arg.DT), LI(Arg.LI) {}
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	75
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	76 /// Handle invalidation events in the new pass manager.
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	77 bool invalidate(Function &F, const PreservedAnalyses &PA,
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	78 FunctionAnalysisManager::Invalidator &Inv);
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	79
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	80 AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	81
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	82 ModRefInfo getModRefInfo(ImmutableCallSite CS, const MemoryLocation &Loc);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	83
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	84 ModRefInfo getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	85
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	86 /// Chases pointers until we find a (constant global) or not.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	87 bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	88
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	89 /// Get the location associated with a pointer argument of a callsite.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	90 ModRefInfo getArgModRefInfo(ImmutableCallSite CS, unsigned ArgIdx);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	91
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	92 /// Returns the behavior when calling the given call site.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	93 FunctionModRefBehavior getModRefBehavior(ImmutableCallSite CS);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	94
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	95 /// Returns the behavior when calling the given function. For use when the
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	96 /// call site is not known.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	97 FunctionModRefBehavior getModRefBehavior(const Function *F);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	98
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	99 private:
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	100 // A linear transformation of a Value; this class represents ZExt(SExt(V,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	101 // SExtBits), ZExtBits) * Scale + Offset.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	102 struct VariableGEPIndex {
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	103 // An opaque Value - we can't decompose this further.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	104 const Value *V;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	105
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	106 // We need to track what extensions we've done as we consider the same Value
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	107 // with different extensions as different variables in a GEP's linear
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	108 // expression;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	109 // e.g.: if V == -1, then sext(x) != zext(x).
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	110 unsigned ZExtBits;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	111 unsigned SExtBits;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	112
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	113 int64_t Scale;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	114
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	115 bool operator==(const VariableGEPIndex &Other) const {
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	116 return V == Other.V && ZExtBits == Other.ZExtBits &&
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	117 SExtBits == Other.SExtBits && Scale == Other.Scale;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	118 }
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	119
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	120 bool operator!=(const VariableGEPIndex &Other) const {
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	121 return !operator==(Other);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	122 }
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	123 };
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	124
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	125 // Represents the internal structure of a GEP, decomposed into a base pointer,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	126 // constant offsets, and variable scaled indices.
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	127 struct DecomposedGEP {
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	128 // Base pointer of the GEP
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	129 const Value *Base;
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	130 // Total constant offset w.r.t the base from indexing into structs
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	131 int64_t StructOffset;
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	132 // Total constant offset w.r.t the base from indexing through
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	133 // pointers/arrays/vectors
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	134 int64_t OtherOffset;
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	135 // Scaled variable (non-constant) indices.
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	136 SmallVector<VariableGEPIndex, 4> VarIndices;
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	137 };
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	138
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	139 /// Track alias queries to guard against recursion.
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	140 using LocPair = std::pair<MemoryLocation, MemoryLocation>;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	141 using AliasCacheTy = SmallDenseMap<LocPair, AliasResult, 8>;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	142 AliasCacheTy AliasCache;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	143
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	144 /// Tracks phi nodes we have visited.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	145 ///
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	146 /// When interpret "Value" pointer equality as value equality we need to make
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	147 /// sure that the "Value" is not part of a cycle. Otherwise, two uses could
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	148 /// come from different "iterations" of a cycle and see different values for
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	149 /// the same "Value" pointer.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	150 ///
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	151 /// The following example shows the problem:
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	152 /// %p = phi(%alloca1, %addr2)
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	153 /// %l = load %ptr
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	154 /// %addr1 = gep, %alloca2, 0, %l
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	155 /// %addr2 = gep %alloca2, 0, (%l + 1)
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	156 /// alias(%p, %addr1) -> MayAlias !
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	157 /// store %l, ...
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	158 SmallPtrSet<const BasicBlock *, 8> VisitedPhiBBs;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	159
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	160 /// Tracks instructions visited by pointsToConstantMemory.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	161 SmallPtrSet<const Value *, 16> Visited;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	162
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	163 static const Value *
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	164 GetLinearExpression(const Value *V, APInt &Scale, APInt &Offset,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	165 unsigned &ZExtBits, unsigned &SExtBits,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	166 const DataLayout &DL, unsigned Depth, AssumptionCache *AC,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	167 DominatorTree *DT, bool &NSW, bool &NUW);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	168
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	169 static bool DecomposeGEPExpression(const Value *V, DecomposedGEP &Decomposed,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	170 const DataLayout &DL, AssumptionCache AC, DominatorTree DT);
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	171
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	172 static bool isGEPBaseAtNegativeOffset(const GEPOperator *GEPOp,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	173 const DecomposedGEP &DecompGEP, const DecomposedGEP &DecompObject,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	174 uint64_t ObjectAccessSize);
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	175
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	176 /// \brief A Heuristic for aliasGEP that searches for a constant offset
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	177 /// between the variables.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	178 ///
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	179 /// GetLinearExpression has some limitations, as generally zext(%x + 1)
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	180 /// != zext(%x) + zext(1) if the arithmetic overflows. GetLinearExpression
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	181 /// will therefore conservatively refuse to decompose these expressions.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	182 /// However, we know that, for all %x, zext(%x) != zext(%x + 1), even if
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	183 /// the addition overflows.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	184 bool
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	185 constantOffsetHeuristic(const SmallVectorImpl<VariableGEPIndex> &VarIndices,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	186 uint64_t V1Size, uint64_t V2Size, int64_t BaseOffset,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	187 AssumptionCache AC, DominatorTree DT);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	188
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	189 bool isValueEqualInPotentialCycles(const Value V1, const Value V2);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	190
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	191 void GetIndexDifference(SmallVectorImpl<VariableGEPIndex> &Dest,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	192 const SmallVectorImpl<VariableGEPIndex> &Src);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	193
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	194 AliasResult aliasGEP(const GEPOperator *V1, uint64_t V1Size,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	195 const AAMDNodes &V1AAInfo, const Value *V2,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	196 uint64_t V2Size, const AAMDNodes &V2AAInfo,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	197 const Value UnderlyingV1, const Value UnderlyingV2);
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	198
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	199 AliasResult aliasPHI(const PHINode *PN, uint64_t PNSize,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	200 const AAMDNodes &PNAAInfo, const Value *V2,
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	201 uint64_t V2Size, const AAMDNodes &V2AAInfo,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	202 const Value *UnderV2);
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	203
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	204 AliasResult aliasSelect(const SelectInst *SI, uint64_t SISize,
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	205 const AAMDNodes &SIAAInfo, const Value *V2,
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	206 uint64_t V2Size, const AAMDNodes &V2AAInfo,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	207 const Value *UnderV2);
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	208
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	209 AliasResult aliasCheck(const Value *V1, uint64_t V1Size, AAMDNodes V1AATag,
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	210 const Value *V2, uint64_t V2Size, AAMDNodes V2AATag,
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	211 const Value O1 = nullptr, const Value O2 = nullptr);
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	212 };
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	213
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	214 /// Analysis pass providing a never-invalidated alias analysis result.
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	215 class BasicAA : public AnalysisInfoMixin<BasicAA> {
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	216 friend AnalysisInfoMixin<BasicAA>;
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	217
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	218 static AnalysisKey Key;
1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	219
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	220 public:
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	221 using Result = BasicAAResult;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	222
120 1172e4bd9c6f update 4.0.0 mir3636 parents: 100 diff changeset	223 BasicAAResult run(Function &F, FunctionAnalysisManager &AM);
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	224 };
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	225
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	226 /// Legacy wrapper pass to provide the BasicAAResult object.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	227 class BasicAAWrapperPass : public FunctionPass {
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	228 std::unique_ptr<BasicAAResult> Result;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	229
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	230 virtual void anchor();
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	231
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	232 public:
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	233 static char ID;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	234
100 7d135dc70f03 LLVM 3.9 Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp> parents: 95 diff changeset	235 BasicAAWrapperPass();
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	236
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	237 BasicAAResult &getResult() { return *Result; }
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	238 const BasicAAResult &getResult() const { return *Result; }
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	239
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	240 bool runOnFunction(Function &F) override;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	241 void getAnalysisUsage(AnalysisUsage &AU) const override;
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	242 };
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	243
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	244 FunctionPass *createBasicAAWrapperPass();
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	245
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	246 /// A helper for the legacy pass manager to create a \c BasicAAResult object
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	247 /// populated to the best of our ability for a particular function when inside
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	248 /// of a \c ModulePass or a \c CallGraphSCCPass.
afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	249 BasicAAResult createLegacyPMBasicAAResult(Pass &P, Function &F);
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	250
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	251 /// This class is a functor to be used in legacy module or SCC passes for
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	252 /// computing AA results for a function. We store the results in fields so that
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	253 /// they live long enough to be queried, but we re-use them each time.
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	254 class LegacyAARGetter {
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	255 Pass &P;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	256 Optional<BasicAAResult> BAR;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	257 Optional<AAResults> AAR;
95 afa8332a0e37 LLVM 3.8 Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> parents: diff changeset	258
121 803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	259 public:
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	260 LegacyAARGetter(Pass &P) : P(P) {}
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	261 AAResults &operator()(Function &F) {
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	262 BAR.emplace(createLegacyPMBasicAAResult(P, F));
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	263 AAR.emplace(createLegacyPMAAResults(P, F, *BAR));
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	264 return *AAR;
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	265 }
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	266 };
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	267
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	268 } // end namespace llvm
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	269
803732b1fca8 LLVM 5.0 kono parents: 120 diff changeset	270 #endif // LLVM_ANALYSIS_BASICALIASANALYSIS_H

Mercurial > hg > Members > tobaru > cbc > CbC_llvm

annotate include/llvm/Analysis/BasicAliasAnalysis.h @ 128:c347d3398279 default tip