// ... = 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 superset of the alias
+// 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/AliasAnalysis.h"
-#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.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));
+static cl::opt<bool> EnableScopedNoAlias("enable-scoped-noalias",
+ cl::init(true));
namespace {
/// AliasScopeNode - This is a simple wrapper around an MDNode which provides
const MDNode *Node;
public:
- AliasScopeNode() : Node(0) {}
+ AliasScopeNode() : Node(nullptr) {}
explicit AliasScopeNode(const MDNode *N) : Node(N) {}
/// getNode - Get the MDNode for this AliasScopeNode.
return dyn_cast_or_null<MDNode>(Node->getOperand(1));
}
};
+} // end of anonymous namespace
-/// ScopedNoAliasAA - This is a simple alias analysis
-/// implementation that uses scoped-noalias metadata to answer queries.
-class ScopedNoAliasAA : public ImmutablePass, public AliasAnalysis {
-public:
- static char ID; // Class identification, replacement for typeinfo
- ScopedNoAliasAA() : ImmutablePass(ID) {
- initializeScopedNoAliasAAPass(*PassRegistry::getPassRegistry());
- }
+AliasResult ScopedNoAliasAAResult::alias(const MemoryLocation &LocA,
+ const MemoryLocation &LocB) {
+ if (!EnableScopedNoAlias)
+ return AAResultBase::alias(LocA, LocB);
- bool doInitialization(Module &M) override;
+ // Get the attached MDNodes.
+ const MDNode *AScopes = LocA.AATags.Scope, *BScopes = LocB.AATags.Scope;
- /// getAdjustedAnalysisPointer - This method is used when a pass implements
- /// an analysis interface through multiple inheritance. If needed, it
- /// should override this to adjust the this pointer as needed for the
- /// specified pass info.
- void *getAdjustedAnalysisPointer(const void *PI) override {
- if (PI == &AliasAnalysis::ID)
- return (AliasAnalysis*)this;
- return this;
- }
+ const MDNode *ANoAlias = LocA.AATags.NoAlias, *BNoAlias = LocB.AATags.NoAlias;
-protected:
- bool mayAliasInScopes(const MDNode *Scopes, const MDNode *NoAlias) const;
- void collectMDInDomain(const MDNode *List, const MDNode *Domain,
- SmallPtrSetImpl<const MDNode *> &Nodes) const;
-
-private:
- void getAnalysisUsage(AnalysisUsage &AU) const override;
- AliasResult alias(const Location &LocA, const Location &LocB) override;
- bool pointsToConstantMemory(const Location &Loc, bool OrLocal) override;
- ModRefBehavior getModRefBehavior(ImmutableCallSite CS) override;
- ModRefBehavior getModRefBehavior(const Function *F) override;
- ModRefResult getModRefInfo(ImmutableCallSite CS,
- const Location &Loc) override;
- ModRefResult getModRefInfo(ImmutableCallSite CS1,
- ImmutableCallSite CS2) override;
-};
-} // End of anonymous namespace
+ if (!mayAliasInScopes(AScopes, BNoAlias))
+ return NoAlias;
-// Register this pass...
-char ScopedNoAliasAA::ID = 0;
-INITIALIZE_AG_PASS(ScopedNoAliasAA, AliasAnalysis, "scoped-noalias",
- "Scoped NoAlias Alias Analysis", false, true, false)
+ if (!mayAliasInScopes(BScopes, ANoAlias))
+ return NoAlias;
-ImmutablePass *llvm::createScopedNoAliasAAPass() {
- return new ScopedNoAliasAA();
+ // If they may alias, chain to the next AliasAnalysis.
+ return AAResultBase::alias(LocA, LocB);
}
-bool ScopedNoAliasAA::doInitialization(Module &M) {
- InitializeAliasAnalysis(this, &M.getDataLayout());
- return true;
+ModRefInfo ScopedNoAliasAAResult::getModRefInfo(ImmutableCallSite CS,
+ const MemoryLocation &Loc) {
+ if (!EnableScopedNoAlias)
+ return AAResultBase::getModRefInfo(CS, Loc);
+
+ if (!mayAliasInScopes(Loc.AATags.Scope, CS.getInstruction()->getMetadata(
+ LLVMContext::MD_noalias)))
+ return MRI_NoModRef;
+
+ if (!mayAliasInScopes(
+ CS.getInstruction()->getMetadata(LLVMContext::MD_alias_scope),
+ Loc.AATags.NoAlias))
+ return MRI_NoModRef;
+
+ return AAResultBase::getModRefInfo(CS, Loc);
}
-void
-ScopedNoAliasAA::getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- AliasAnalysis::getAnalysisUsage(AU);
+ModRefInfo ScopedNoAliasAAResult::getModRefInfo(ImmutableCallSite CS1,
+ ImmutableCallSite CS2) {
+ if (!EnableScopedNoAlias)
+ return AAResultBase::getModRefInfo(CS1, CS2);
+
+ if (!mayAliasInScopes(
+ CS1.getInstruction()->getMetadata(LLVMContext::MD_alias_scope),
+ CS2.getInstruction()->getMetadata(LLVMContext::MD_noalias)))
+ return MRI_NoModRef;
+
+ if (!mayAliasInScopes(
+ CS2.getInstruction()->getMetadata(LLVMContext::MD_alias_scope),
+ CS1.getInstruction()->getMetadata(LLVMContext::MD_noalias)))
+ return MRI_NoModRef;
+
+ return AAResultBase::getModRefInfo(CS1, CS2);
}
-void
-ScopedNoAliasAA::collectMDInDomain(const MDNode *List, const MDNode *Domain,
- SmallPtrSetImpl<const MDNode *> &Nodes) const {
+void ScopedNoAliasAAResult::collectMDInDomain(
+ const MDNode *List, const MDNode *Domain,
+ SmallPtrSetImpl<const MDNode *> &Nodes) const {
for (unsigned i = 0, ie = List->getNumOperands(); i != ie; ++i)
if (const MDNode *MD = dyn_cast<MDNode>(List->getOperand(i)))
if (AliasScopeNode(MD).getDomain() == Domain)
Nodes.insert(MD);
}
-bool
-ScopedNoAliasAA::mayAliasInScopes(const MDNode *Scopes,
- const MDNode *NoAlias) const {
+bool ScopedNoAliasAAResult::mayAliasInScopes(const MDNode *Scopes,
+ const MDNode *NoAlias) const {
if (!Scopes || !NoAlias)
return true;
return true;
}
-AliasAnalysis::AliasResult
-ScopedNoAliasAA::alias(const Location &LocA, const Location &LocB) {
- if (!EnableScopedNoAlias)
- return AliasAnalysis::alias(LocA, LocB);
-
- // Get the attached MDNodes.
- const MDNode *AScopes = LocA.AATags.Scope,
- *BScopes = LocB.AATags.Scope;
+ScopedNoAliasAAResult ScopedNoAliasAA::run(Function &F,
+ AnalysisManager<Function> *AM) {
+ return ScopedNoAliasAAResult(AM->getResult<TargetLibraryAnalysis>(F));
+}
- const MDNode *ANoAlias = LocA.AATags.NoAlias,
- *BNoAlias = LocB.AATags.NoAlias;
+char ScopedNoAliasAA::PassID;
- if (!mayAliasInScopes(AScopes, BNoAlias))
- return NoAlias;
-
- if (!mayAliasInScopes(BScopes, ANoAlias))
- return NoAlias;
+char ScopedNoAliasAAWrapperPass::ID = 0;
+INITIALIZE_PASS_BEGIN(ScopedNoAliasAAWrapperPass, "scoped-noalias",
+ "Scoped NoAlias Alias Analysis", false, true)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
+INITIALIZE_PASS_END(ScopedNoAliasAAWrapperPass, "scoped-noalias",
+ "Scoped NoAlias Alias Analysis", false, true)
- // If they may alias, chain to the next AliasAnalysis.
- return AliasAnalysis::alias(LocA, LocB);
+ImmutablePass *llvm::createScopedNoAliasAAWrapperPass() {
+ return new ScopedNoAliasAAWrapperPass();
}
-bool ScopedNoAliasAA::pointsToConstantMemory(const Location &Loc,
- bool OrLocal) {
- return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
+ScopedNoAliasAAWrapperPass::ScopedNoAliasAAWrapperPass() : ImmutablePass(ID) {
+ initializeScopedNoAliasAAWrapperPassPass(*PassRegistry::getPassRegistry());
}
-AliasAnalysis::ModRefBehavior
-ScopedNoAliasAA::getModRefBehavior(ImmutableCallSite CS) {
- return AliasAnalysis::getModRefBehavior(CS);
+bool ScopedNoAliasAAWrapperPass::doInitialization(Module &M) {
+ Result.reset(new ScopedNoAliasAAResult(
+ getAnalysis<TargetLibraryInfoWrapperPass>().getTLI()));
+ return false;
}
-AliasAnalysis::ModRefBehavior
-ScopedNoAliasAA::getModRefBehavior(const Function *F) {
- return AliasAnalysis::getModRefBehavior(F);
+bool ScopedNoAliasAAWrapperPass::doFinalization(Module &M) {
+ Result.reset();
+ return false;
}
-AliasAnalysis::ModRefResult
-ScopedNoAliasAA::getModRefInfo(ImmutableCallSite CS, const Location &Loc) {
- if (!EnableScopedNoAlias)
- return AliasAnalysis::getModRefInfo(CS, Loc);
-
- if (!mayAliasInScopes(Loc.AATags.Scope, CS.getInstruction()->getMetadata(
- LLVMContext::MD_noalias)))
- return NoModRef;
-
- if (!mayAliasInScopes(
- CS.getInstruction()->getMetadata(LLVMContext::MD_alias_scope),
- Loc.AATags.NoAlias))
- return NoModRef;
-
- return AliasAnalysis::getModRefInfo(CS, Loc);
-}
-
-AliasAnalysis::ModRefResult
-ScopedNoAliasAA::getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2) {
- if (!EnableScopedNoAlias)
- return AliasAnalysis::getModRefInfo(CS1, CS2);
-
- if (!mayAliasInScopes(
- CS1.getInstruction()->getMetadata(LLVMContext::MD_alias_scope),
- CS2.getInstruction()->getMetadata(LLVMContext::MD_noalias)))
- return NoModRef;
-
- if (!mayAliasInScopes(
- CS2.getInstruction()->getMetadata(LLVMContext::MD_alias_scope),
- CS1.getInstruction()->getMetadata(LLVMContext::MD_noalias)))
- return NoModRef;
-
- return AliasAnalysis::getModRefInfo(CS1, CS2);
+void ScopedNoAliasAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ AU.addRequired<TargetLibraryInfoWrapperPass>();
}
-
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