[libc++] Refactoring __sync_* builtins; NFC

Summary: Wrap __sync_* builtins with __libcpp_ functions to facility future customizations as atomic operations are unavailable on some targets.

Reviewers: danalbert, EricWF, jroelofs

Subscribers: joerg, llvm-commits

Differential Revision: https://reviews.llvm.org/D34918

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@307591 91177308-0d34-0410-b5e6-96231b3b80d8

src/locale.cpp

@@ -667,7 +667,7 @@ locale::id::__get()
 void
 locale::id::__init()
 {
-    __id_ = __sync_add_and_fetch(&__next_id, 1);
+    __id_ = __libcpp_sync_add_and_fetch(&__next_id, 1);
 }
 
 // template <> class collate_byname<char>

src/support/runtime/exception_fallback.ipp

@@ -9,6 +9,7 @@
 //===----------------------------------------------------------------------===//
 
 #include <cstdio>
+#include <__atomic_support>
 
 namespace std {
 
@@ -20,13 +21,13 @@ _LIBCPP_SAFE_STATIC static std::unexpected_handler __unexpected_handler;
 unexpected_handler
 set_unexpected(unexpected_handler func) _NOEXCEPT
 {
-  return __sync_lock_test_and_set(&__unexpected_handler, func);
+  return __libcpp_sync_lock_test_and_set(&__unexpected_handler, func);
 }
 
 unexpected_handler
 get_unexpected() _NOEXCEPT
 {
-  return __sync_fetch_and_add(&__unexpected_handler, (unexpected_handler)0);
+  return __libcpp_sync_fetch_and_add(&__unexpected_handler, (unexpected_handler)0);
 
 }
 
@@ -41,14 +42,13 @@ void unexpected()
 terminate_handler
 set_terminate(terminate_handler func) _NOEXCEPT
 {
-  return __sync_lock_test_and_set(&__terminate_handler, func);
+  return __libcpp_sync_lock_test_and_set(&__terminate_handler, func);
 }
 
 terminate_handler
 get_terminate() _NOEXCEPT
 {
-  return __sync_fetch_and_add(&__terminate_handler, (terminate_handler)0);
-
+  return __libcpp_sync_fetch_and_add(&__terminate_handler, (terminate_handler)0);
 }
 
 #ifndef __EMSCRIPTEN__ // We provide this in JS

src/support/runtime/new_handler_fallback.ipp

@@ -8,6 +8,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <__atomic_support>
+
 namespace std {
 
 _LIBCPP_SAFE_STATIC static std::new_handler __new_handler;
@@ -15,13 +17,13 @@ _LIBCPP_SAFE_STATIC static std::new_handler __new_handler;
 new_handler
 set_new_handler(new_handler handler) _NOEXCEPT
 {
-    return __sync_lock_test_and_set(&__new_handler, handler);
+    return __libcpp_sync_lock_test_and_set(&__new_handler, handler);
 }
 
 new_handler
 get_new_handler() _NOEXCEPT
 {
-    return __sync_fetch_and_add(&__new_handler, nullptr);
+    return __libcpp_sync_fetch_and_add<new_handler>(&__new_handler, nullptr);
 }
 
 } // namespace std