Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 93 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/Analysis/TypeBasedAliasAnalysis.h b/clang-r353983/include/llvm/Analysis/TypeBasedAliasAnalysis.h
new file mode 100644
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--- /dev/null
+++ b/clang-r353983/include/llvm/Analysis/TypeBasedAliasAnalysis.h
@@ -0,0 +1,93 @@
+//===- TypeBasedAliasAnalysis.h - Type-Based Alias 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// This is the interface for a metadata-based TBAA. See the source file for
+/// details on the algorithm.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
+#define LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
+
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/IR/InstrTypes.h"
+#include "llvm/IR/PassManager.h"
+#include "llvm/Pass.h"
+#include <memory>
+
+namespace llvm {
+
+class Function;
+class MDNode;
+class MemoryLocation;
+
+/// A simple AA result that uses TBAA metadata to answer queries.
+class TypeBasedAAResult : public AAResultBase<TypeBasedAAResult> {
+  friend AAResultBase<TypeBasedAAResult>;
+
+public:
+  /// Handle invalidation events from the new pass manager.
+  ///
+  /// By definition, this result is stateless and so remains valid.
+  bool invalidate(Function &, const PreservedAnalyses &,
+                  FunctionAnalysisManager::Invalidator &) {
+    return false;
+  }
+
+  AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
+  bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
+  FunctionModRefBehavior getModRefBehavior(const CallBase *Call);
+  FunctionModRefBehavior getModRefBehavior(const Function *F);
+  ModRefInfo getModRefInfo(const CallBase *Call, const MemoryLocation &Loc);
+  ModRefInfo getModRefInfo(const CallBase *Call1, const CallBase *Call2);
+
+private:
+  bool Aliases(const MDNode *A, const MDNode *B) const;
+  bool PathAliases(const MDNode *A, const MDNode *B) const;
+};
+
+/// Analysis pass providing a never-invalidated alias analysis result.
+class TypeBasedAA : public AnalysisInfoMixin<TypeBasedAA> {
+  friend AnalysisInfoMixin<TypeBasedAA>;
+
+  static AnalysisKey Key;
+
+public:
+  using Result = TypeBasedAAResult;
+
+  TypeBasedAAResult run(Function &F, FunctionAnalysisManager &AM);
+};
+
+/// Legacy wrapper pass to provide the TypeBasedAAResult object.
+class TypeBasedAAWrapperPass : public ImmutablePass {
+  std::unique_ptr<TypeBasedAAResult> Result;
+
+public:
+  static char ID;
+
+  TypeBasedAAWrapperPass();
+
+  TypeBasedAAResult &getResult() { return *Result; }
+  const TypeBasedAAResult &getResult() const { return *Result; }
+
+  bool doInitialization(Module &M) override;
+  bool doFinalization(Module &M) override;
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+};
+
+//===--------------------------------------------------------------------===//
+//
+// createTypeBasedAAWrapperPass - This pass implements metadata-based
+// type-based alias analysis.
+//
+ImmutablePass *createTypeBasedAAWrapperPass();
+
+} // end namespace llvm
+
+#endif // LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H