--- /dev/null
+//===- ScopedNoAliasAA.h - Scoped No-Alias Alias Analysis -------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This is the interface for a metadata-based scoped no-alias analysis.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_SCOPEDNOALIASAA_H
+#define LLVM_ANALYSIS_SCOPEDNOALIASAA_H
+
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+/// 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());
+ }
+
+ bool doInitialization(Module &M) override;
+
+ /// 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;
+ }
+
+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 MemoryLocation &LocA,
+ const MemoryLocation &LocB) override;
+ bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal) override;
+ FunctionModRefBehavior getModRefBehavior(ImmutableCallSite CS) override;
+ FunctionModRefBehavior getModRefBehavior(const Function *F) override;
+ ModRefInfo getModRefInfo(ImmutableCallSite CS,
+ const MemoryLocation &Loc) override;
+ ModRefInfo getModRefInfo(ImmutableCallSite CS1,
+ ImmutableCallSite CS2) override;
+};
+
+//===--------------------------------------------------------------------===//
+//
+// createScopedNoAliasAAPass - This pass implements metadata-based
+// scoped noalias analysis.
+//
+ImmutablePass *createScopedNoAliasAAPass();
+
+}
+
+#endif