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📄 AliasAnalysis.cpp(33.55 KB)
📄 AliasAnalysisEvaluator.cpp(15.64 KB)
📄 AliasAnalysisSummary.cpp(3.49 KB)
📄 AliasAnalysisSummary.h(10.17 KB)
📄 AliasSetTracker.cpp(25.86 KB)
📄 Analysis.cpp(5.29 KB)
📄 AssumeBundleQueries.cpp(7.96 KB)
📄 AssumptionCache.cpp(10.94 KB)
📄 BasicAliasAnalysis.cpp(85.81 KB)
📄 BlockFrequencyInfo.cpp(12.39 KB)
📄 BlockFrequencyInfoImpl.cpp(28.6 KB)
📄 BranchProbabilityInfo.cpp(43.48 KB)
📄 CFG.cpp(9.9 KB)
📄 CFGPrinter.cpp(11.2 KB)
📄 CFLAndersAliasAnalysis.cpp(33.01 KB)
📄 CFLGraph.h(21.23 KB)
📄 CFLSteensAliasAnalysis.cpp(13.24 KB)
📄 CGSCCPassManager.cpp(31.2 KB)
📄 CallGraph.cpp(12.86 KB)
📄 CallGraphSCCPass.cpp(26.31 KB)
📄 CallPrinter.cpp(9.48 KB)
📄 CaptureTracking.cpp(15.38 KB)
📄 CmpInstAnalysis.cpp(4.63 KB)
📄 CodeMetrics.cpp(6.99 KB)
📄 ConstantFolding.cpp(105.15 KB)
📄 CostModel.cpp(3.87 KB)
📄 DDG.cpp(11.29 KB)
📄 Delinearization.cpp(4.49 KB)
📄 DemandedBits.cpp(16.27 KB)
📄 DependenceAnalysis.cpp(150.78 KB)
📄 DependenceGraphBuilder.cpp(19.24 KB)
📄 DivergenceAnalysis.cpp(15.59 KB)
📄 DomPrinter.cpp(9.67 KB)
📄 DomTreeUpdater.cpp(15.21 KB)
📄 DominanceFrontier.cpp(3.2 KB)
📄 EHPersonalities.cpp(5.89 KB)
📄 GlobalsModRef.cpp(41 KB)
📄 GuardUtils.cpp(3.27 KB)
📄 HeatUtils.cpp(2.85 KB)
📄 IVDescriptors.cpp(42.28 KB)
📄 IVUsers.cpp(16.12 KB)
📄 IndirectCallPromotionAnalysis.cpp(4.33 KB)
📄 InlineAdvisor.cpp(15.28 KB)
📄 InlineCost.cpp(99.47 KB)
📄 InlineFeaturesAnalysis.cpp(1.59 KB)
📄 InlineSizeEstimatorAnalysis.cpp(10.95 KB)
📄 InstCount.cpp(2.45 KB)
📄 InstructionPrecedenceTracking.cpp(4.8 KB)
📄 InstructionSimplify.cpp(216.91 KB)
📄 Interval.cpp(1.78 KB)
📄 IntervalPartition.cpp(4.5 KB)
📄 LazyBlockFrequencyInfo.cpp(2.81 KB)
📄 LazyBranchProbabilityInfo.cpp(2.96 KB)
📄 LazyCallGraph.cpp(67.33 KB)
📄 LazyValueInfo.cpp(76.38 KB)
📄 LegacyDivergenceAnalysis.cpp(14.82 KB)
📄 Lint.cpp(29.07 KB)
📄 Loads.cpp(20.6 KB)
📄 LoopAccessAnalysis.cpp(88.02 KB)
📄 LoopAnalysisManager.cpp(6.6 KB)
📄 LoopCacheAnalysis.cpp(23.53 KB)
📄 LoopInfo.cpp(37.15 KB)
📄 LoopNestAnalysis.cpp(10.62 KB)
📄 LoopPass.cpp(12.89 KB)
📄 LoopUnrollAnalyzer.cpp(7.26 KB)
📄 MLInlineAdvisor.cpp(11.36 KB)
📄 MemDepPrinter.cpp(5.13 KB)
📄 MemDerefPrinter.cpp(2.53 KB)
📄 MemoryBuiltins.cpp(41.14 KB)
📄 MemoryDependenceAnalysis.cpp(69.89 KB)
📄 MemoryLocation.cpp(7.92 KB)
📄 MemorySSA.cpp(90.16 KB)
📄 MemorySSAUpdater.cpp(57.9 KB)
📄 ModuleDebugInfoPrinter.cpp(4.02 KB)
📄 ModuleSummaryAnalysis.cpp(38.13 KB)
📄 MustExecute.cpp(31.18 KB)
📄 ObjCARCAliasAnalysis.cpp(5.81 KB)
📄 ObjCARCAnalysisUtils.cpp(1.07 KB)
📄 ObjCARCInstKind.cpp(23.15 KB)
📄 OptimizationRemarkEmitter.cpp(4.23 KB)
📄 PHITransAddr.cpp(16.05 KB)
📄 PhiValues.cpp(8.4 KB)
📄 PostDominators.cpp(3.59 KB)
📄 ProfileSummaryInfo.cpp(18.07 KB)
📄 PtrUseVisitor.cpp(1.28 KB)
📄 RegionInfo.cpp(6.5 KB)
📄 RegionPass.cpp(9.23 KB)
📄 RegionPrinter.cpp(8.61 KB)
📄 ReleaseModeModelRunner.cpp(2.83 KB)
📄 ScalarEvolution.cpp(475.26 KB)
📄 ScalarEvolutionAliasAnalysis.cpp(5.96 KB)
📄 ScalarEvolutionDivision.cpp(7.51 KB)
📄 ScalarEvolutionNormalization.cpp(4.59 KB)
📄 ScopedNoAliasAA.cpp(7.38 KB)
📄 StackLifetime.cpp(12.22 KB)
📄 StackSafetyAnalysis.cpp(31.81 KB)
📄 StratifiedSets.h(18.67 KB)
📄 SyncDependenceAnalysis.cpp(12.97 KB)
📄 SyntheticCountsUtils.cpp(3.81 KB)
📄 TFUtils.cpp(8.99 KB)
📄 TargetLibraryInfo.cpp(58.98 KB)
📄 TargetTransformInfo.cpp(48.15 KB)
📄 Trace.cpp(1.8 KB)
📄 TypeBasedAliasAnalysis.cpp(26.04 KB)
📄 TypeMetadataUtils.cpp(5.93 KB)
📄 VFABIDemangling.cpp(16.46 KB)
📄 ValueLattice.cpp(1.19 KB)
📄 ValueLatticeUtils.cpp(1.53 KB)
📄 ValueTracking.cpp(243.08 KB)
📄 VectorUtils.cpp(48.57 KB)
📁 models

Editing: ObjCARCAliasAnalysis.cpp

//===- ObjCARCAliasAnalysis.cpp - ObjC ARC Optimization -------------------===//
//
// 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 file defines a simple ARC-aware AliasAnalysis using special knowledge
/// of Objective C to enhance other optimization passes which rely on the Alias
/// Analysis infrastructure.
///
/// WARNING: This file knows about certain library functions. It recognizes them
/// by name, and hardwires knowledge of their semantics.
///
/// WARNING: This file knows about how certain Objective-C library functions are
/// used. Naive LLVM IR transformations which would otherwise be
/// behavior-preserving may break these assumptions.
///
/// TODO: Theoretically we could check for dependencies between objc_* calls
/// and FMRB_OnlyAccessesArgumentPointees calls or other well-behaved calls.
///
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/ObjCARCAliasAnalysis.h"
#include "llvm/Analysis/ObjCARCAnalysisUtils.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Value.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"

#define DEBUG_TYPE "objc-arc-aa"

using namespace llvm;
using namespace llvm::objcarc;

AliasResult ObjCARCAAResult::alias(const MemoryLocation &LocA,
                                   const MemoryLocation &LocB,
                                   AAQueryInfo &AAQI) {
  if (!EnableARCOpts)
    return AAResultBase::alias(LocA, LocB, AAQI);

// First, strip off no-ops, including ObjC-specific no-ops, and try making a
  // precise alias query.
  const Value *SA = GetRCIdentityRoot(LocA.Ptr);
  const Value *SB = GetRCIdentityRoot(LocB.Ptr);
  AliasResult Result =
      AAResultBase::alias(MemoryLocation(SA, LocA.Size, LocA.AATags),
                          MemoryLocation(SB, LocB.Size, LocB.AATags), AAQI);
  if (Result != MayAlias)
    return Result;

// If that failed, climb to the underlying object, including climbing through
  // ObjC-specific no-ops, and try making an imprecise alias query.
  const Value *UA = GetUnderlyingObjCPtr(SA, DL);
  const Value *UB = GetUnderlyingObjCPtr(SB, DL);
  if (UA != SA || UB != SB) {
    Result = AAResultBase::alias(MemoryLocation(UA), MemoryLocation(UB), AAQI);
    // We can't use MustAlias or PartialAlias results here because
    // GetUnderlyingObjCPtr may return an offsetted pointer value.
    if (Result == NoAlias)
      return NoAlias;
  }

// If that failed, fail. We don't need to chain here, since that's covered
  // by the earlier precise query.
  return MayAlias;
}

bool ObjCARCAAResult::pointsToConstantMemory(const MemoryLocation &Loc,
                                             AAQueryInfo &AAQI, bool OrLocal) {
  if (!EnableARCOpts)
    return AAResultBase::pointsToConstantMemory(Loc, AAQI, OrLocal);

// First, strip off no-ops, including ObjC-specific no-ops, and try making
  // a precise alias query.
  const Value *S = GetRCIdentityRoot(Loc.Ptr);
  if (AAResultBase::pointsToConstantMemory(
          MemoryLocation(S, Loc.Size, Loc.AATags), AAQI, OrLocal))
    return true;

// If that failed, climb to the underlying object, including climbing through
  // ObjC-specific no-ops, and try making an imprecise alias query.
  const Value *U = GetUnderlyingObjCPtr(S, DL);
  if (U != S)
    return AAResultBase::pointsToConstantMemory(MemoryLocation(U), AAQI,
                                                OrLocal);

// If that failed, fail. We don't need to chain here, since that's covered
  // by the earlier precise query.
  return false;
}

FunctionModRefBehavior ObjCARCAAResult::getModRefBehavior(const Function *F) {
  if (!EnableARCOpts)
    return AAResultBase::getModRefBehavior(F);

switch (GetFunctionClass(F)) {
  case ARCInstKind::NoopCast:
    return FMRB_DoesNotAccessMemory;
  default:
    break;
  }

return AAResultBase::getModRefBehavior(F);
}

ModRefInfo ObjCARCAAResult::getModRefInfo(const CallBase *Call,
                                          const MemoryLocation &Loc,
                                          AAQueryInfo &AAQI) {
  if (!EnableARCOpts)
    return AAResultBase::getModRefInfo(Call, Loc, AAQI);

switch (GetBasicARCInstKind(Call)) {
  case ARCInstKind::Retain:
  case ARCInstKind::RetainRV:
  case ARCInstKind::Autorelease:
  case ARCInstKind::AutoreleaseRV:
  case ARCInstKind::NoopCast:
  case ARCInstKind::AutoreleasepoolPush:
  case ARCInstKind::FusedRetainAutorelease:
  case ARCInstKind::FusedRetainAutoreleaseRV:
    // These functions don't access any memory visible to the compiler.
    // Note that this doesn't include objc_retainBlock, because it updates
    // pointers when it copies block data.
    return ModRefInfo::NoModRef;
  default:
    break;
  }

return AAResultBase::getModRefInfo(Call, Loc, AAQI);
}

ObjCARCAAResult ObjCARCAA::run(Function &F, FunctionAnalysisManager &AM) {
  return ObjCARCAAResult(F.getParent()->getDataLayout());
}

char ObjCARCAAWrapperPass::ID = 0;
INITIALIZE_PASS(ObjCARCAAWrapperPass, "objc-arc-aa",
                "ObjC-ARC-Based Alias Analysis", false, true)

ImmutablePass *llvm::createObjCARCAAWrapperPass() {
  return new ObjCARCAAWrapperPass();
}

ObjCARCAAWrapperPass::ObjCARCAAWrapperPass() : ImmutablePass(ID) {
  initializeObjCARCAAWrapperPassPass(*PassRegistry::getPassRegistry());
}

bool ObjCARCAAWrapperPass::doInitialization(Module &M) {
  Result.reset(new ObjCARCAAResult(M.getDataLayout()));
  return false;
}

bool ObjCARCAAWrapperPass::doFinalization(Module &M) {
  Result.reset();
  return false;
}

void ObjCARCAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesAll();
}

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Editing: ObjCARCAliasAnalysis.cpp

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