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

1 files changed, 88 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/IR/OptBisect.h b/clang-r353983/include/llvm/IR/OptBisect.h
new file mode 100644
index 00000000..8d51b685
--- /dev/null
+++ b/clang-r353983/include/llvm/IR/OptBisect.h
@@ -0,0 +1,88 @@
+//===- llvm/IR/OptBisect.h - LLVM Bisect support ----------------*- 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 file declares the interface for bisecting optimizations.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_OPTBISECT_H
+#define LLVM_IR_OPTBISECT_H
+
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+
+class Pass;
+class Module;
+class Function;
+class BasicBlock;
+class Region;
+class Loop;
+class CallGraphSCC;
+
+/// Extensions to this class implement mechanisms to disable passes and
+/// individual optimizations at compile time.
+class OptPassGate {
+public:
+  virtual ~OptPassGate() = default;
+
+  virtual bool shouldRunPass(const Pass *P, const Module &U) { return true; }
+  virtual bool shouldRunPass(const Pass *P, const Function &U)  {return true; }
+  virtual bool shouldRunPass(const Pass *P, const BasicBlock &U)  { return true; }
+  virtual bool shouldRunPass(const Pass *P, const Region &U)  { return true; }
+  virtual bool shouldRunPass(const Pass *P, const Loop &U)  { return true; }
+  virtual bool shouldRunPass(const Pass *P, const CallGraphSCC &U)  { return true; }
+};
+
+/// This class implements a mechanism to disable passes and individual
+/// optimizations at compile time based on a command line option
+/// (-opt-bisect-limit) in order to perform a bisecting search for
+/// optimization-related problems.
+class OptBisect : public OptPassGate {
+public:
+  /// Default constructor, initializes the OptBisect state based on the
+  /// -opt-bisect-limit command line argument.
+  ///
+  /// By default, bisection is disabled.
+  ///
+  /// Clients should not instantiate this class directly.  All access should go
+  /// through LLVMContext.
+  OptBisect();
+
+  virtual ~OptBisect() = default;
+
+  /// Checks the bisect limit to determine if the specified pass should run.
+  ///
+  /// These functions immediately return true if bisection is disabled. If the
+  /// bisect limit is set to -1, the functions print a message describing
+  /// the pass and the bisect number assigned to it and return true.  Otherwise,
+  /// the functions print a message with the bisect number assigned to the
+  /// pass and indicating whether or not the pass will be run and return true if
+  /// the bisect limit has not yet been exceeded or false if it has.
+  ///
+  /// Most passes should not call these routines directly. Instead, they are
+  /// called through helper routines provided by the pass base classes.  For
+  /// instance, function passes should call FunctionPass::skipFunction().
+  bool shouldRunPass(const Pass *P, const Module &U) override;
+  bool shouldRunPass(const Pass *P, const Function &U) override;
+  bool shouldRunPass(const Pass *P, const BasicBlock &U) override;
+  bool shouldRunPass(const Pass *P, const Region &U) override;
+  bool shouldRunPass(const Pass *P, const Loop &U) override;
+  bool shouldRunPass(const Pass *P, const CallGraphSCC &U) override;
+
+private:
+  bool checkPass(const StringRef PassName, const StringRef TargetDesc);
+
+  bool BisectEnabled = false;
+  unsigned LastBisectNum = 0;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_IR_OPTBISECT_H