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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: PhiValues.h

//===- PhiValues.h - Phi Value 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the PhiValues class, and associated passes, which can be
// used to find the underlying values of the phis in a function, i.e. the
// non-phi values that can be found by traversing the phi graph.
//
// This information is computed lazily and cached. If new phis are added to the
// function they are handled correctly, but if an existing phi has its operands
// modified PhiValues has to be notified by calling invalidateValue.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_PHIVALUES_H
#define LLVM_ANALYSIS_PHIVALUES_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"

namespace llvm {

class Value;
class PHINode;
class Function;

/// Class for calculating and caching the underlying values of phis in a
/// function.
///
/// Initially the PhiValues is empty, and gets incrementally populated whenever
/// it is queried.
class PhiValues {
public:
  using ValueSet = SmallPtrSet<Value *, 4>;

/// Construct an empty PhiValues.
  PhiValues(const Function &F) : F(F) {}

/// Get the underlying values of a phi.
  ///
  /// This returns the cached value if PN has previously been processed,
  /// otherwise it processes it first.
  const ValueSet &getValuesForPhi(const PHINode *PN);

/// Notify PhiValues that the cached information using V is no longer valid
  ///
  /// Whenever a phi has its operands modified the cached values for that phi
  /// (and the phis that use that phi) become invalid. A user of PhiValues has
  /// to notify it of this by calling invalidateValue on either the operand or
  /// the phi, which will then clear the relevant cached information.
  void invalidateValue(const Value *V);

/// Free the memory used by this class.
  void releaseMemory();

/// Print out the values currently in the cache.
  void print(raw_ostream &OS) const;

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

private:
  using PhiSet = SmallPtrSet<const PHINode *, 4>;
  using ConstValueSet = SmallPtrSet<const Value *, 4>;

/// The next depth number to be used by processPhi.
  unsigned int NextDepthNumber = 1;

/// Depth numbers of phis. Phis with the same depth number are part of the
  /// same strongly connected component.
  DenseMap<const PHINode *, unsigned int> DepthMap;

/// Non-phi values reachable from each component.
  DenseMap<unsigned int, ValueSet> NonPhiReachableMap;

/// All values reachable from each component.
  DenseMap<unsigned int, ConstValueSet> ReachableMap;

/// A CallbackVH to notify PhiValues when a value is deleted or replaced, so
  /// that the cached information for that value can be cleared to avoid
  /// dangling pointers to invalid values.
  class PhiValuesCallbackVH final : public CallbackVH {
    PhiValues *PV;
    void deleted() override;
    void allUsesReplacedWith(Value *New) override;

public:
    PhiValuesCallbackVH(Value *V, PhiValues *PV = nullptr)
        : CallbackVH(V), PV(PV) {}
  };

/// A set of callbacks to the values that processPhi has seen.
  DenseSet<PhiValuesCallbackVH, DenseMapInfo<Value *>> TrackedValues;

/// The function that the PhiValues is for.
  const Function &F;

/// Process a phi so that its entries in the depth and reachable maps are
  /// fully populated.
  void processPhi(const PHINode *PN, SmallVectorImpl<const PHINode *> &Stack);
};

/// The analysis pass which yields a PhiValues
///
/// The analysis does nothing by itself, and just returns an empty PhiValues
/// which will get filled in as it's used.
class PhiValuesAnalysis : public AnalysisInfoMixin<PhiValuesAnalysis> {
  friend AnalysisInfoMixin<PhiValuesAnalysis>;
  static AnalysisKey Key;

public:
  using Result = PhiValues;
  PhiValues run(Function &F, FunctionAnalysisManager &);
};

/// A pass for printing the PhiValues for a function.
///
/// This pass doesn't print whatever information the PhiValues happens to hold,
/// but instead first uses the PhiValues to analyze all the phis in the function
/// so the complete information is printed.
class PhiValuesPrinterPass : public PassInfoMixin<PhiValuesPrinterPass> {
  raw_ostream &OS;

public:
  explicit PhiValuesPrinterPass(raw_ostream &OS) : OS(OS) {}
  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
};

/// Wrapper pass for the legacy pass manager
class PhiValuesWrapperPass : public FunctionPass {
  std::unique_ptr<PhiValues> Result;

public:
  static char ID;
  PhiValuesWrapperPass();

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

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

} // namespace llvm

#endif

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