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

1 files changed, 119 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/Support/Options.h b/clang-r353983/include/llvm/Support/Options.h
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+++ b/clang-r353983/include/llvm/Support/Options.h
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+//===- llvm/Support/Options.h - Debug options 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 helper objects for defining debug options that can be
+/// configured via the command line. The new API currently builds on the cl::opt
+/// API, but does not require the use of static globals.
+///
+/// With this API options are registered during initialization. For passes, this
+/// happens during pass initialization. Passes with options will call a static
+/// registerOptions method during initialization that registers options with the
+/// OptionRegistry. An example implementation of registerOptions is:
+///
+/// static void registerOptions() {
+///   OptionRegistry::registerOption<bool, Scalarizer,
+///                                &Scalarizer::ScalarizeLoadStore>(
+///       "scalarize-load-store",
+///       "Allow the scalarizer pass to scalarize loads and store", false);
+/// }
+///
+/// When reading data for options the interface is via the LLVMContext. Option
+/// data for passes should be read from the context during doInitialization. An
+/// example of reading the above option would be:
+///
+/// ScalarizeLoadStore =
+///   M.getContext().getOption<bool,
+///                            Scalarizer,
+///                            &Scalarizer::ScalarizeLoadStore>();
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_OPTIONS_H
+#define LLVM_SUPPORT_OPTIONS_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/Support/CommandLine.h"
+
+namespace llvm {
+
+namespace detail {
+
+// Options are keyed of the unique address of a static character synthesized
+// based on template arguments.
+template <typename ValT, typename Base, ValT(Base::*Mem)> class OptionKey {
+public:
+  static char ID;
+};
+
+template <typename ValT, typename Base, ValT(Base::*Mem)>
+char OptionKey<ValT, Base, Mem>::ID = 0;
+
+} // namespace detail
+
+/// Singleton class used to register debug options.
+///
+/// The OptionRegistry is responsible for managing lifetimes of the options and
+/// provides interfaces for option registration and reading values from options.
+/// This object is a singleton, only one instance should ever exist so that all
+/// options are registered in the same place.
+class OptionRegistry {
+private:
+  DenseMap<void *, cl::Option *> Options;
+
+  /// Adds a cl::Option to the registry.
+  ///
+  /// \param Key unique key for option
+  /// \param O option to map to \p Key
+  ///
+  /// Allocated cl::Options are owned by the OptionRegistry and are deallocated
+  /// on destruction or removal
+  void addOption(void *Key, cl::Option *O);
+
+public:
+  ~OptionRegistry();
+  OptionRegistry() {}
+
+  /// Returns a reference to the singleton instance.
+  static OptionRegistry &instance();
+
+  /// Registers an option with the OptionRegistry singleton.
+  ///
+  /// \tparam ValT type of the option's data
+  /// \tparam Base class used to key the option
+  /// \tparam Mem member of \p Base used for keying the option
+  ///
+  /// Options are keyed off the template parameters to generate unique static
+  /// characters. The template parameters are (1) the type of the data the
+  /// option stores (\p ValT), the class that will read the option (\p Base),
+  /// and the member that the class will store the data into (\p Mem).
+  template <typename ValT, typename Base, ValT(Base::*Mem)>
+  static void registerOption(StringRef ArgStr, StringRef Desc,
+                             const ValT &InitValue) {
+    cl::opt<ValT> *Option = new cl::opt<ValT>(ArgStr, cl::desc(Desc),
+                                              cl::Hidden, cl::init(InitValue));
+    instance().addOption(&detail::OptionKey<ValT, Base, Mem>::ID, Option);
+  }
+
+  /// Returns the value of the option.
+  ///
+  /// \tparam ValT type of the option's data
+  /// \tparam Base class used to key the option
+  /// \tparam Mem member of \p Base used for keying the option
+  ///
+  /// Reads option values based on the key generated by the template parameters.
+  /// Keying for get() is the same as keying for registerOption.
+  template <typename ValT, typename Base, ValT(Base::*Mem)> ValT get() const {
+    auto It = Options.find(&detail::OptionKey<ValT, Base, Mem>::ID);
+    assert(It != Options.end() && "Option not in OptionRegistry");
+    return *(cl::opt<ValT> *)It->second;
+  }
+};
+
+} // namespace llvm
+
+#endif