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📁 ..
📄 AliasAnalysis.h(51.98 KB)
📄 AliasAnalysisEvaluator.h(2.7 KB)
📄 AliasSetTracker.h(15.42 KB)
📄 AssumeBundleQueries.h(6.66 KB)
📄 AssumptionCache.h(8.39 KB)
📄 BasicAliasAnalysis.h(10.2 KB)
📄 BlockFrequencyInfo.h(5.59 KB)
📄 BlockFrequencyInfoImpl.h(56.46 KB)
📄 BranchProbabilityInfo.h(10.1 KB)
📄 CFG.h(7.76 KB)
📄 CFGPrinter.h(9.31 KB)
📄 CFLAliasAnalysisUtils.h(1.66 KB)
📄 CFLAndersAliasAnalysis.h(3.97 KB)
📄 CFLSteensAliasAnalysis.h(4.58 KB)
📄 CGSCCPassManager.h(41.2 KB)
📄 CallGraph.h(18.88 KB)
📄 CallGraphSCCPass.h(5.01 KB)
📄 CallPrinter.h(799 B)
📄 CaptureTracking.h(4.78 KB)
📄 CmpInstAnalysis.h(2.57 KB)
📄 CodeMetrics.h(3.15 KB)
📄 ConstantFolding.h(8.01 KB)
📄 DDG.h(19.15 KB)
📄 DOTGraphTraitsPass.h(5.5 KB)
📄 DemandedBits.h(4.07 KB)
📄 DependenceAnalysis.h(41.83 KB)
📄 DependenceGraphBuilder.h(7.74 KB)
📄 DivergenceAnalysis.h(7.38 KB)
📄 DomPrinter.h(1.04 KB)
📄 DomTreeUpdater.h(13.2 KB)
📄 DominanceFrontier.h(6.63 KB)
📄 DominanceFrontierImpl.h(7.12 KB)
📄 EHPersonalities.h(3.22 KB)
📄 GlobalsModRef.h(5.96 KB)
📄 GuardUtils.h(2.11 KB)
📄 HeatUtils.h(1.16 KB)
📄 IVDescriptors.h(14.56 KB)
📄 IVUsers.h(6.07 KB)
📄 IndirectCallPromotionAnalysis.h(2.61 KB)
📄 IndirectCallVisitor.h(1.16 KB)
📄 InlineAdvisor.h(8.71 KB)
📄 InlineCost.h(11.33 KB)
📄 InlineFeaturesAnalysis.h(1.5 KB)
📄 InlineModelFeatureMaps.h(3.41 KB)
📄 InlineSizeEstimatorAnalysis.h(1.07 KB)
📄 InstructionPrecedenceTracking.h(5.9 KB)
📄 InstructionSimplify.h(13.36 KB)
📄 Interval.h(4.84 KB)
📄 IntervalIterator.h(10.64 KB)
📄 IntervalPartition.h(4.05 KB)
📄 IteratedDominanceFrontier.h(2.62 KB)
📄 LazyBlockFrequencyInfo.h(4.34 KB)
📄 LazyBranchProbabilityInfo.h(4.21 KB)
📄 LazyCallGraph.h(50.13 KB)
📄 LazyValueInfo.h(5.4 KB)
📄 LegacyDivergenceAnalysis.h(2.53 KB)
📄 Lint.h(1.35 KB)
📄 Loads.h(7.86 KB)
📄 LoopAccessAnalysis.h(29.75 KB)
📄 LoopAnalysisManager.h(5.83 KB)
📄 LoopCacheAnalysis.h(11.91 KB)
📄 LoopInfo.h(48.27 KB)
📄 LoopInfoImpl.h(27.14 KB)
📄 LoopIterator.h(8.83 KB)
📄 LoopNestAnalysis.h(5.61 KB)
📄 LoopPass.h(4.29 KB)
📄 LoopUnrollAnalyzer.h(3.42 KB)
📄 MLInlineAdvisor.h(3.48 KB)
📄 MLModelRunner.h(1.16 KB)
📄 MemoryBuiltins.h(13.42 KB)
📄 MemoryDependenceAnalysis.h(20.82 KB)
📄 MemoryLocation.h(10.99 KB)
📄 MemorySSA.h(45.92 KB)
📄 MemorySSAUpdater.h(14.55 KB)
📄 ModuleSummaryAnalysis.h(3.44 KB)
📄 MustExecute.h(20.2 KB)
📄 ObjCARCAliasAnalysis.h(3.35 KB)
📄 ObjCARCAnalysisUtils.h(10.22 KB)
📄 ObjCARCInstKind.h(4.87 KB)
📄 OptimizationRemarkEmitter.h(5.93 KB)
📄 PHITransAddr.h(4.77 KB)
📄 Passes.h(3.88 KB)
📄 PhiValues.h(5.25 KB)
📄 PostDominators.h(3.41 KB)
📄 ProfileSummaryInfo.h(9.3 KB)
📄 PtrUseVisitor.h(9.96 KB)
📄 RegionInfo.h(35.23 KB)
📄 RegionInfoImpl.h(25.16 KB)
📄 RegionIterator.h(14.07 KB)
📄 RegionPass.h(4.05 KB)
📄 RegionPrinter.h(2.25 KB)
📄 ScalarEvolution.h(89.21 KB)
📄 ScalarEvolutionAliasAnalysis.h(2.09 KB)
📄 ScalarEvolutionDivision.h(2.48 KB)
📄 ScalarEvolutionExpressions.h(28.61 KB)
📄 ScalarEvolutionNormalization.h(2.47 KB)
📄 ScopedNoAliasAA.h(2.83 KB)
📄 SparsePropagation.h(19.43 KB)
📄 StackLifetime.h(6.16 KB)
📄 StackSafetyAnalysis.h(4.91 KB)
📄 SyncDependenceAnalysis.h(2.85 KB)
📄 SyntheticCountsUtils.h(1.85 KB)
📄 TargetFolder.h(11.04 KB)
📄 TargetLibraryInfo.def(55.35 KB)
📄 TargetLibraryInfo.h(16.86 KB)
📄 TargetTransformInfo.h(96.51 KB)
📄 TargetTransformInfoImpl.h(37.63 KB)
📄 Trace.h(4.1 KB)
📄 TypeBasedAliasAnalysis.h(3.05 KB)
📄 TypeMetadataUtils.h(1.94 KB)
📁 Utils
📄 ValueLattice.h(15.14 KB)
📄 ValueLatticeUtils.h(1.66 KB)
📄 ValueTracking.h(35.82 KB)
📄 VecFuncs.def(10.94 KB)
📄 VectorUtils.h(37.26 KB)

Editing: BasicAliasAnalysis.h

//===- BasicAliasAnalysis.h - Stateless, local Alias Analysis ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
/// This is the interface for LLVM's primary stateless and local alias analysis.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_BASICALIASANALYSIS_H
#define LLVM_ANALYSIS_BASICALIASANALYSIS_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Pass.h"
#include <algorithm>
#include <cstdint>
#include <memory>
#include <utility>

namespace llvm {

struct AAMDNodes;
class APInt;
class AssumptionCache;
class BasicBlock;
class DataLayout;
class DominatorTree;
class Function;
class GEPOperator;
class LoopInfo;
class PHINode;
class SelectInst;
class TargetLibraryInfo;
class PhiValues;
class Value;

/// This is the AA result object for the basic, local, and stateless alias
/// analysis. It implements the AA query interface in an entirely stateless
/// manner. As one consequence, it is never invalidated due to IR changes.
/// While it does retain some storage, that is used as an optimization and not
/// to preserve information from query to query. However it does retain handles
/// to various other analyses and must be recomputed when those analyses are.
class BasicAAResult : public AAResultBase<BasicAAResult> {
  friend AAResultBase<BasicAAResult>;

const DataLayout &DL;
  const Function &F;
  const TargetLibraryInfo &TLI;
  AssumptionCache &AC;
  DominatorTree *DT;
  LoopInfo *LI;
  PhiValues *PV;

public:
  BasicAAResult(const DataLayout &DL, const Function &F,
                const TargetLibraryInfo &TLI, AssumptionCache &AC,
                DominatorTree *DT = nullptr, LoopInfo *LI = nullptr,
                PhiValues *PV = nullptr)
      : AAResultBase(), DL(DL), F(F), TLI(TLI), AC(AC), DT(DT), LI(LI), PV(PV)
        {}

BasicAAResult(const BasicAAResult &Arg)
      : AAResultBase(Arg), DL(Arg.DL), F(Arg.F), TLI(Arg.TLI), AC(Arg.AC),
        DT(Arg.DT),  LI(Arg.LI), PV(Arg.PV) {}
  BasicAAResult(BasicAAResult &&Arg)
      : AAResultBase(std::move(Arg)), DL(Arg.DL), F(Arg.F), TLI(Arg.TLI),
        AC(Arg.AC), DT(Arg.DT), LI(Arg.LI), PV(Arg.PV) {}

/// Handle invalidation events in the new pass manager.
  bool invalidate(Function &Fn, const PreservedAnalyses &PA,
                  FunctionAnalysisManager::Invalidator &Inv);

AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB,
                    AAQueryInfo &AAQI);

ModRefInfo getModRefInfo(const CallBase *Call, const MemoryLocation &Loc,
                           AAQueryInfo &AAQI);

ModRefInfo getModRefInfo(const CallBase *Call1, const CallBase *Call2,
                           AAQueryInfo &AAQI);

/// Chases pointers until we find a (constant global) or not.
  bool pointsToConstantMemory(const MemoryLocation &Loc, AAQueryInfo &AAQI,
                              bool OrLocal);

/// Get the location associated with a pointer argument of a callsite.
  ModRefInfo getArgModRefInfo(const CallBase *Call, unsigned ArgIdx);

/// Returns the behavior when calling the given call site.
  FunctionModRefBehavior getModRefBehavior(const CallBase *Call);

/// Returns the behavior when calling the given function. For use when the
  /// call site is not known.
  FunctionModRefBehavior getModRefBehavior(const Function *Fn);

private:
  // A linear transformation of a Value; this class represents ZExt(SExt(V,
  // SExtBits), ZExtBits) * Scale + Offset.
  struct VariableGEPIndex {
    // An opaque Value - we can't decompose this further.
    const Value *V;

// We need to track what extensions we've done as we consider the same Value
    // with different extensions as different variables in a GEP's linear
    // expression;
    // e.g.: if V == -1, then sext(x) != zext(x).
    unsigned ZExtBits;
    unsigned SExtBits;

APInt Scale;

bool operator==(const VariableGEPIndex &Other) const {
      return V == Other.V && ZExtBits == Other.ZExtBits &&
             SExtBits == Other.SExtBits && Scale == Other.Scale;
    }

bool operator!=(const VariableGEPIndex &Other) const {
      return !operator==(Other);
    }
  };

// Represents the internal structure of a GEP, decomposed into a base pointer,
  // constant offsets, and variable scaled indices.
  struct DecomposedGEP {
    // Base pointer of the GEP
    const Value *Base;
    // Total constant offset w.r.t the base from indexing into structs
    APInt StructOffset;
    // Total constant offset w.r.t the base from indexing through
    // pointers/arrays/vectors
    APInt OtherOffset;
    // Scaled variable (non-constant) indices.
    SmallVector<VariableGEPIndex, 4> VarIndices;
    // Is GEP index scale compile-time constant.
    bool HasCompileTimeConstantScale;
  };

/// Tracks phi nodes we have visited.
  ///
  /// When interpret "Value" pointer equality as value equality we need to make
  /// sure that the "Value" is not part of a cycle. Otherwise, two uses could
  /// come from different "iterations" of a cycle and see different values for
  /// the same "Value" pointer.
  ///
  /// The following example shows the problem:
  ///   %p = phi(%alloca1, %addr2)
  ///   %l = load %ptr
  ///   %addr1 = gep, %alloca2, 0, %l
  ///   %addr2 = gep  %alloca2, 0, (%l + 1)
  ///      alias(%p, %addr1) -> MayAlias !
  ///   store %l, ...
  SmallPtrSet<const BasicBlock *, 8> VisitedPhiBBs;

/// Tracks instructions visited by pointsToConstantMemory.
  SmallPtrSet<const Value *, 16> Visited;

static const Value *
  GetLinearExpression(const Value *V, APInt &Scale, APInt &Offset,
                      unsigned &ZExtBits, unsigned &SExtBits,
                      const DataLayout &DL, unsigned Depth, AssumptionCache *AC,
                      DominatorTree *DT, bool &NSW, bool &NUW);

static bool DecomposeGEPExpression(const Value *V, DecomposedGEP &Decomposed,
      const DataLayout &DL, AssumptionCache *AC, DominatorTree *DT);

static bool isGEPBaseAtNegativeOffset(const GEPOperator *GEPOp,
      const DecomposedGEP &DecompGEP, const DecomposedGEP &DecompObject,
      LocationSize ObjectAccessSize);

/// A Heuristic for aliasGEP that searches for a constant offset
  /// between the variables.
  ///
  /// GetLinearExpression has some limitations, as generally zext(%x + 1)
  /// != zext(%x) + zext(1) if the arithmetic overflows. GetLinearExpression
  /// will therefore conservatively refuse to decompose these expressions.
  /// However, we know that, for all %x, zext(%x) != zext(%x + 1), even if
  /// the addition overflows.
  bool
  constantOffsetHeuristic(const SmallVectorImpl<VariableGEPIndex> &VarIndices,
                          LocationSize V1Size, LocationSize V2Size,
                          const APInt &BaseOffset, AssumptionCache *AC,
                          DominatorTree *DT);

bool isValueEqualInPotentialCycles(const Value *V1, const Value *V2);

void GetIndexDifference(SmallVectorImpl<VariableGEPIndex> &Dest,
                          const SmallVectorImpl<VariableGEPIndex> &Src);

AliasResult aliasGEP(const GEPOperator *V1, LocationSize V1Size,
                       const AAMDNodes &V1AAInfo, const Value *V2,
                       LocationSize V2Size, const AAMDNodes &V2AAInfo,
                       const Value *UnderlyingV1, const Value *UnderlyingV2,
                       AAQueryInfo &AAQI);

AliasResult aliasPHI(const PHINode *PN, LocationSize PNSize,
                       const AAMDNodes &PNAAInfo, const Value *V2,
                       LocationSize V2Size, const AAMDNodes &V2AAInfo,
                       const Value *UnderV2, AAQueryInfo &AAQI);

AliasResult aliasSelect(const SelectInst *SI, LocationSize SISize,
                          const AAMDNodes &SIAAInfo, const Value *V2,
                          LocationSize V2Size, const AAMDNodes &V2AAInfo,
                          const Value *UnderV2, AAQueryInfo &AAQI);

AliasResult aliasCheck(const Value *V1, LocationSize V1Size,
                         AAMDNodes V1AATag, const Value *V2,
                         LocationSize V2Size, AAMDNodes V2AATag,
                         AAQueryInfo &AAQI, const Value *O1 = nullptr,
                         const Value *O2 = nullptr);
};

/// Analysis pass providing a never-invalidated alias analysis result.
class BasicAA : public AnalysisInfoMixin<BasicAA> {
  friend AnalysisInfoMixin<BasicAA>;

static AnalysisKey Key;

public:
  using Result = BasicAAResult;

BasicAAResult run(Function &F, FunctionAnalysisManager &AM);
};

/// Legacy wrapper pass to provide the BasicAAResult object.
class BasicAAWrapperPass : public FunctionPass {
  std::unique_ptr<BasicAAResult> Result;

virtual void anchor();

public:
  static char ID;

BasicAAWrapperPass();

BasicAAResult &getResult() { return *Result; }
  const BasicAAResult &getResult() const { return *Result; }

bool runOnFunction(Function &F) override;
  void getAnalysisUsage(AnalysisUsage &AU) const override;
};

FunctionPass *createBasicAAWrapperPass();

/// A helper for the legacy pass manager to create a \c BasicAAResult object
/// populated to the best of our ability for a particular function when inside
/// of a \c ModulePass or a \c CallGraphSCCPass.
BasicAAResult createLegacyPMBasicAAResult(Pass &P, Function &F);

/// This class is a functor to be used in legacy module or SCC passes for
/// computing AA results for a function. We store the results in fields so that
/// they live long enough to be queried, but we re-use them each time.
class LegacyAARGetter {
  Pass &P;
  Optional<BasicAAResult> BAR;
  Optional<AAResults> AAR;

public:
  LegacyAARGetter(Pass &P) : P(P) {}
  AAResults &operator()(Function &F) {
    BAR.emplace(createLegacyPMBasicAAResult(P, F));
    AAR.emplace(createLegacyPMAAResults(P, F, *BAR));
    return *AAR;
  }
};

} // end namespace llvm

#endif // LLVM_ANALYSIS_BASICALIASANALYSIS_H

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