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

1 files changed, 159 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/Support/Registry.h b/clang-r353983/include/llvm/Support/Registry.h
new file mode 100644
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+++ b/clang-r353983/include/llvm/Support/Registry.h
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+//=== Registry.h - Linker-supported plugin registries -----------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines a registry template for discovering pluggable modules.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_REGISTRY_H
+#define LLVM_SUPPORT_REGISTRY_H
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/DynamicLibrary.h"
+#include <memory>
+
+namespace llvm {
+  /// A simple registry entry which provides only a name, description, and
+  /// no-argument constructor.
+  template <typename T>
+  class SimpleRegistryEntry {
+    StringRef Name, Desc;
+    std::unique_ptr<T> (*Ctor)();
+
+  public:
+    SimpleRegistryEntry(StringRef N, StringRef D, std::unique_ptr<T> (*C)())
+        : Name(N), Desc(D), Ctor(C) {}
+
+    StringRef getName() const { return Name; }
+    StringRef getDesc() const { return Desc; }
+    std::unique_ptr<T> instantiate() const { return Ctor(); }
+  };
+
+  /// A global registry used in conjunction with static constructors to make
+  /// pluggable components (like targets or garbage collectors) "just work" when
+  /// linked with an executable.
+  template <typename T>
+  class Registry {
+  public:
+    typedef T type;
+    typedef SimpleRegistryEntry<T> entry;
+
+    class node;
+    class iterator;
+
+  private:
+    Registry() = delete;
+
+    friend class node;
+    static node *Head, *Tail;
+
+  public:
+    /// Node in linked list of entries.
+    ///
+    class node {
+      friend class iterator;
+      friend Registry<T>;
+
+      node *Next;
+      const entry& Val;
+
+    public:
+      node(const entry &V) : Next(nullptr), Val(V) {}
+    };
+
+    /// Add a node to the Registry: this is the interface between the plugin and
+    /// the executable.
+    ///
+    /// This function is exported by the executable and called by the plugin to
+    /// add a node to the executable's registry. Therefore it's not defined here
+    /// to avoid it being instantiated in the plugin and is instead defined in
+    /// the executable (see LLVM_INSTANTIATE_REGISTRY below).
+    static void add_node(node *N);
+
+    /// Iterators for registry entries.
+    ///
+    class iterator
+        : public llvm::iterator_facade_base<iterator, std::forward_iterator_tag,
+                                            const entry> {
+      const node *Cur;
+
+    public:
+      explicit iterator(const node *N) : Cur(N) {}
+
+      bool operator==(const iterator &That) const { return Cur == That.Cur; }
+      iterator &operator++() { Cur = Cur->Next; return *this; }
+      const entry &operator*() const { return Cur->Val; }
+    };
+
+    // begin is not defined here in order to avoid usage of an undefined static
+    // data member, instead it's instantiated by LLVM_INSTANTIATE_REGISTRY.
+    static iterator begin();
+    static iterator end()   { return iterator(nullptr); }
+
+    static iterator_range<iterator> entries() {
+      return make_range(begin(), end());
+    }
+
+    /// A static registration template. Use like such:
+    ///
+    ///   Registry<Collector>::Add<FancyGC>
+    ///   X("fancy-gc", "Newfangled garbage collector.");
+    ///
+    /// Use of this template requires that:
+    ///
+    ///  1. The registered subclass has a default constructor.
+    template <typename V>
+    class Add {
+      entry Entry;
+      node Node;
+
+      static std::unique_ptr<T> CtorFn() { return make_unique<V>(); }
+
+    public:
+      Add(StringRef Name, StringRef Desc)
+          : Entry(Name, Desc, CtorFn), Node(Entry) {
+        add_node(&Node);
+      }
+    };
+  };
+} // end namespace llvm
+
+/// Instantiate a registry class.
+///
+/// This provides template definitions of add_node, begin, and the Head and Tail
+/// pointers, then explicitly instantiates them. We could explicitly specialize
+/// them, instead of the two-step process of define then instantiate, but
+/// strictly speaking that's not allowed by the C++ standard (we would need to
+/// have explicit specialization declarations in all translation units where the
+/// specialization is used) so we don't.
+#define LLVM_INSTANTIATE_REGISTRY(REGISTRY_CLASS) \
+  namespace llvm { \
+  template<typename T> typename Registry<T>::node *Registry<T>::Head = nullptr;\
+  template<typename T> typename Registry<T>::node *Registry<T>::Tail = nullptr;\
+  template<typename T> \
+  void Registry<T>::add_node(typename Registry<T>::node *N) { \
+    if (Tail) \
+      Tail->Next = N; \
+    else \
+      Head = N; \
+    Tail = N; \
+  } \
+  template<typename T> typename Registry<T>::iterator Registry<T>::begin() { \
+    return iterator(Head); \
+  } \
+  template REGISTRY_CLASS::node *Registry<REGISTRY_CLASS::type>::Head; \
+  template REGISTRY_CLASS::node *Registry<REGISTRY_CLASS::type>::Tail; \
+  template \
+  void Registry<REGISTRY_CLASS::type>::add_node(REGISTRY_CLASS::node*); \
+  template REGISTRY_CLASS::iterator Registry<REGISTRY_CLASS::type>::begin(); \
+  }
+
+#endif // LLVM_SUPPORT_REGISTRY_H