1 files changed, 164 insertions, 0 deletions
diff --git a/clang-r353983/include/llvm/Support/FormatVariadicDetails.h b/clang-r353983/include/llvm/Support/FormatVariadicDetails.h
new file mode 100644
index 00000000..e3c18513
--- /dev/null
+++ b/clang-r353983/include/llvm/Support/FormatVariadicDetails.h
@@ -0,0 +1,164 @@
+//===- FormatVariadicDetails.h - Helpers for FormatVariadic.h ----*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_FORMATVARIADIC_DETAILS_H
+#define LLVM_SUPPORT_FORMATVARIADIC_DETAILS_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include <type_traits>
+
+namespace llvm {
+template <typename T, typename Enable = void> struct format_provider {};
+class Error;
+
+namespace detail {
+class format_adapter {
+  virtual void anchor();
+
+protected:
+  virtual ~format_adapter() {}
+
+public:
+  virtual void format(raw_ostream &S, StringRef Options) = 0;
+};
+
+template <typename T> class provider_format_adapter : public format_adapter {
+  T Item;
+
+public:
+  explicit provider_format_adapter(T &&Item) : Item(std::forward<T>(Item)) {}
+
+  void format(llvm::raw_ostream &S, StringRef Options) override {
+    format_provider<typename std::decay<T>::type>::format(Item, S, Options);
+  }
+};
+
+template <typename T>
+class stream_operator_format_adapter : public format_adapter {
+  T Item;
+
+public:
+  explicit stream_operator_format_adapter(T &&Item)
+      : Item(std::forward<T>(Item)) {}
+
+  void format(llvm::raw_ostream &S, StringRef Options) override { S << Item; }
+};
+
+template <typename T> class missing_format_adapter;
+
+// Test if format_provider<T> is defined on T and contains a member function
+// with the signature:
+//   static void format(const T&, raw_stream &, StringRef);
+//
+template <class T> class has_FormatProvider {
+public:
+  using Decayed = typename std::decay<T>::type;
+  typedef void (*Signature_format)(const Decayed &, llvm::raw_ostream &,
+                                   StringRef);
+
+  template <typename U>
+  static char test(SameType<Signature_format, &U::format> *);
+
+  template <typename U> static double test(...);
+
+  static bool const value =
+      (sizeof(test<llvm::format_provider<Decayed>>(nullptr)) == 1);
+};
+
+// Test if raw_ostream& << T -> raw_ostream& is findable via ADL.
+template <class T> class has_StreamOperator {
+public:
+  using ConstRefT = const typename std::decay<T>::type &;
+
+  template <typename U>
+  static char test(typename std::enable_if<
+                   std::is_same<decltype(std::declval<llvm::raw_ostream &>()
+                                         << std::declval<U>()),
+                                llvm::raw_ostream &>::value,
+                   int *>::type);
+
+  template <typename U> static double test(...);
+
+  static bool const value = (sizeof(test<ConstRefT>(nullptr)) == 1);
+};
+
+// Simple template that decides whether a type T should use the member-function
+// based format() invocation.
+template <typename T>
+struct uses_format_member
+    : public std::integral_constant<
+          bool,
+          std::is_base_of<format_adapter,
+                          typename std::remove_reference<T>::type>::value> {};
+
+// Simple template that decides whether a type T should use the format_provider
+// based format() invocation.  The member function takes priority, so this test
+// will only be true if there is not ALSO a format member.
+template <typename T>
+struct uses_format_provider
+    : public std::integral_constant<
+          bool, !uses_format_member<T>::value && has_FormatProvider<T>::value> {
+};
+
+// Simple template that decides whether a type T should use the operator<<
+// based format() invocation.  This takes last priority.
+template <typename T>
+struct uses_stream_operator
+    : public std::integral_constant<bool, !uses_format_member<T>::value &&
+                                              !uses_format_provider<T>::value &&
+                                              has_StreamOperator<T>::value> {};
+
+// Simple template that decides whether a type T has neither a member-function
+// nor format_provider based implementation that it can use.  Mostly used so
+// that the compiler spits out a nice diagnostic when a type with no format
+// implementation can be located.
+template <typename T>
+struct uses_missing_provider
+    : public std::integral_constant<bool, !uses_format_member<T>::value &&
+                                              !uses_format_provider<T>::value &&
+                                              !uses_stream_operator<T>::value> {
+};
+
+template <typename T>
+typename std::enable_if<uses_format_member<T>::value, T>::type
+build_format_adapter(T &&Item) {
+  return std::forward<T>(Item);
+}
+
+template <typename T>
+typename std::enable_if<uses_format_provider<T>::value,
+                        provider_format_adapter<T>>::type
+build_format_adapter(T &&Item) {
+  return provider_format_adapter<T>(std::forward<T>(Item));
+}
+
+template <typename T>
+typename std::enable_if<uses_stream_operator<T>::value,
+                        stream_operator_format_adapter<T>>::type
+build_format_adapter(T &&Item) {
+  // If the caller passed an Error by value, then stream_operator_format_adapter
+  // would be responsible for consuming it.
+  // Make the caller opt into this by calling fmt_consume().
+  static_assert(
+      !std::is_same<llvm::Error, typename std::remove_cv<T>::type>::value,
+      "llvm::Error-by-value must be wrapped in fmt_consume() for formatv");
+  return stream_operator_format_adapter<T>(std::forward<T>(Item));
+}
+
+template <typename T>
+typename std::enable_if<uses_missing_provider<T>::value,
+                        missing_format_adapter<T>>::type
+build_format_adapter(T &&Item) {
+  return missing_format_adapter<T>();
+}
+}
+}
+
+#endif