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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: ScopedNoAliasAA.cpp

//===- ScopedNoAliasAA.cpp - Scoped No-Alias Alias Analysis ---------------===//
//
// 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 ScopedNoAlias alias-analysis pass, which implements
// metadata-based scoped no-alias support.
//
// Alias-analysis scopes are defined by an id (which can be a string or some
// other metadata node), a domain node, and an optional descriptive string.
// A domain is defined by an id (which can be a string or some other metadata
// node), and an optional descriptive string.
//
// !dom0 =   metadata !{ metadata !"domain of foo()" }
// !scope1 = metadata !{ metadata !scope1, metadata !dom0, metadata !"scope 1" }
// !scope2 = metadata !{ metadata !scope2, metadata !dom0, metadata !"scope 2" }
//
// Loads and stores can be tagged with an alias-analysis scope, and also, with
// a noalias tag for a specific scope:
//
// ... = load %ptr1, !alias.scope !{ !scope1 }
// ... = load %ptr2, !alias.scope !{ !scope1, !scope2 }, !noalias !{ !scope1 }
//
// When evaluating an aliasing query, if one of the instructions is associated
// has a set of noalias scopes in some domain that is a superset of the alias
// scopes in that domain of some other instruction, then the two memory
// accesses are assumed not to alias.
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/ScopedNoAliasAA.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"

using namespace llvm;

// A handy option for disabling scoped no-alias functionality. The same effect
// can also be achieved by stripping the associated metadata tags from IR, but
// this option is sometimes more convenient.
static cl::opt<bool> EnableScopedNoAlias("enable-scoped-noalias",
                                         cl::init(true), cl::Hidden);

namespace {

/// This is a simple wrapper around an MDNode which provides a higher-level
/// interface by hiding the details of how alias analysis information is encoded
/// in its operands.
class AliasScopeNode {
  const MDNode *Node = nullptr;

public:
  AliasScopeNode() = default;
  explicit AliasScopeNode(const MDNode *N) : Node(N) {}

/// Get the MDNode for this AliasScopeNode.
  const MDNode *getNode() const { return Node; }

/// Get the MDNode for this AliasScopeNode's domain.
  const MDNode *getDomain() const {
    if (Node->getNumOperands() < 2)
      return nullptr;
    return dyn_cast_or_null<MDNode>(Node->getOperand(1));
  }
};

} // end anonymous namespace

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

// Get the attached MDNodes.
  const MDNode *AScopes = LocA.AATags.Scope, *BScopes = LocB.AATags.Scope;

const MDNode *ANoAlias = LocA.AATags.NoAlias, *BNoAlias = LocB.AATags.NoAlias;

if (!mayAliasInScopes(AScopes, BNoAlias))
    return NoAlias;

if (!mayAliasInScopes(BScopes, ANoAlias))
    return NoAlias;

// If they may alias, chain to the next AliasAnalysis.
  return AAResultBase::alias(LocA, LocB, AAQI);
}

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

if (!mayAliasInScopes(Loc.AATags.Scope,
                        Call->getMetadata(LLVMContext::MD_noalias)))
    return ModRefInfo::NoModRef;

if (!mayAliasInScopes(Call->getMetadata(LLVMContext::MD_alias_scope),
                        Loc.AATags.NoAlias))
    return ModRefInfo::NoModRef;

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

ModRefInfo ScopedNoAliasAAResult::getModRefInfo(const CallBase *Call1,
                                                const CallBase *Call2,
                                                AAQueryInfo &AAQI) {
  if (!EnableScopedNoAlias)
    return AAResultBase::getModRefInfo(Call1, Call2, AAQI);

if (!mayAliasInScopes(Call1->getMetadata(LLVMContext::MD_alias_scope),
                        Call2->getMetadata(LLVMContext::MD_noalias)))
    return ModRefInfo::NoModRef;

if (!mayAliasInScopes(Call2->getMetadata(LLVMContext::MD_alias_scope),
                        Call1->getMetadata(LLVMContext::MD_noalias)))
    return ModRefInfo::NoModRef;

return AAResultBase::getModRefInfo(Call1, Call2, AAQI);
}

static void collectMDInDomain(const MDNode *List, const MDNode *Domain,
                              SmallPtrSetImpl<const MDNode *> &Nodes) {
  for (const MDOperand &MDOp : List->operands())
    if (const MDNode *MD = dyn_cast<MDNode>(MDOp))
      if (AliasScopeNode(MD).getDomain() == Domain)
        Nodes.insert(MD);
}

bool ScopedNoAliasAAResult::mayAliasInScopes(const MDNode *Scopes,
                                             const MDNode *NoAlias) const {
  if (!Scopes || !NoAlias)
    return true;

// Collect the set of scope domains relevant to the noalias scopes.
  SmallPtrSet<const MDNode *, 16> Domains;
  for (const MDOperand &MDOp : NoAlias->operands())
    if (const MDNode *NAMD = dyn_cast<MDNode>(MDOp))
      if (const MDNode *Domain = AliasScopeNode(NAMD).getDomain())
        Domains.insert(Domain);

// We alias unless, for some domain, the set of noalias scopes in that domain
  // is a superset of the set of alias scopes in that domain.
  for (const MDNode *Domain : Domains) {
    SmallPtrSet<const MDNode *, 16> ScopeNodes;
    collectMDInDomain(Scopes, Domain, ScopeNodes);
    if (ScopeNodes.empty())
      continue;

SmallPtrSet<const MDNode *, 16> NANodes;
    collectMDInDomain(NoAlias, Domain, NANodes);

// To not alias, all of the nodes in ScopeNodes must be in NANodes.
    bool FoundAll = true;
    for (const MDNode *SMD : ScopeNodes)
      if (!NANodes.count(SMD)) {
        FoundAll = false;
        break;
      }

if (FoundAll)
      return false;
  }

return true;
}

AnalysisKey ScopedNoAliasAA::Key;

ScopedNoAliasAAResult ScopedNoAliasAA::run(Function &F,
                                           FunctionAnalysisManager &AM) {
  return ScopedNoAliasAAResult();
}

char ScopedNoAliasAAWrapperPass::ID = 0;

INITIALIZE_PASS(ScopedNoAliasAAWrapperPass, "scoped-noalias",
                "Scoped NoAlias Alias Analysis", false, true)

ImmutablePass *llvm::createScopedNoAliasAAWrapperPass() {
  return new ScopedNoAliasAAWrapperPass();
}

ScopedNoAliasAAWrapperPass::ScopedNoAliasAAWrapperPass() : ImmutablePass(ID) {
  initializeScopedNoAliasAAWrapperPassPass(*PassRegistry::getPassRegistry());
}

bool ScopedNoAliasAAWrapperPass::doInitialization(Module &M) {
  Result.reset(new ScopedNoAliasAAResult());
  return false;
}

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

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

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Editing: ScopedNoAliasAA.cpp

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