hxy9243 updated this revision to Diff 73293.
hxy9243 added a comment.
Addresses comments from @halyavin, rename "atomic_support.h" to
"__atomic_support" to avoid collisions with application headers.
Repository:
rL LLVM
https://reviews.llvm.org/D24991
Files:
libcxx/include/__atomic_support
libcxx/include/memory
libcxx/src/include/atomic_support.h
libcxx/src/memory.cpp
libcxx/src/mutex.cpp
Index: libcxx/src/mutex.cpp
===================================================================
--- libcxx/src/mutex.cpp
+++ libcxx/src/mutex.cpp
@@ -12,7 +12,7 @@
#include "limits"
#include "system_error"
#include "cassert"
-#include "include/atomic_support.h"
+#include "__atomic_support"
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_HAS_NO_THREADS
Index: libcxx/src/memory.cpp
===================================================================
--- libcxx/src/memory.cpp
+++ libcxx/src/memory.cpp
@@ -13,85 +13,17 @@
#include "mutex"
#include "thread"
#endif
-#include "include/atomic_support.h"
+#include "__atomic_support"
_LIBCPP_BEGIN_NAMESPACE_STD
-namespace
-{
-
-// NOTE: Relaxed and acq/rel atomics (for increment and decrement respectively)
-// should be sufficient for thread safety.
-// See https://llvm.org/bugs/show_bug.cgi?id=22803
-template <class T>
-inline T
-increment(T& t) _NOEXCEPT
-{
- return __libcpp_atomic_add(&t, 1, _AO_Relaxed);
-}
-
-template <class T>
-inline T
-decrement(T& t) _NOEXCEPT
-{
- return __libcpp_atomic_add(&t, -1, _AO_Acq_Rel);
-}
-
-} // namespace
-
const allocator_arg_t allocator_arg = allocator_arg_t();
bad_weak_ptr::~bad_weak_ptr() _NOEXCEPT {}
-const char*
-bad_weak_ptr::what() const _NOEXCEPT
-{
- return "bad_weak_ptr";
-}
+__shared_count::~__shared_count() {}
-__shared_count::~__shared_count()
-{
-}
-
-void
-__shared_count::__add_shared() _NOEXCEPT
-{
- increment(__shared_owners_);
-}
-
-bool
-__shared_count::__release_shared() _NOEXCEPT
-{
- if (decrement(__shared_owners_) == -1)
- {
- __on_zero_shared();
- return true;
- }
- return false;
-}
-
-__shared_weak_count::~__shared_weak_count()
-{
-}
-
-void
-__shared_weak_count::__add_shared() _NOEXCEPT
-{
- __shared_count::__add_shared();
-}
-
-void
-__shared_weak_count::__add_weak() _NOEXCEPT
-{
- increment(__shared_weak_owners_);
-}
-
-void
-__shared_weak_count::__release_shared() _NOEXCEPT
-{
- if (__shared_count::__release_shared())
- __release_weak();
-}
+__shared_weak_count::~__shared_weak_count() {}
void
__shared_weak_count::__release_weak() _NOEXCEPT
Index: libcxx/src/include/atomic_support.h
===================================================================
--- libcxx/src/include/atomic_support.h
+++ /dev/null
@@ -1,158 +0,0 @@
-//===----------------------------------------------------------------------===////
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===////
-
-#ifndef ATOMIC_SUPPORT_H
-#define ATOMIC_SUPPORT_H
-
-#include "__config"
-#include "memory" // for __libcpp_relaxed_load
-
-#if defined(__clang__) && __has_builtin(__atomic_load_n) \
- && __has_builtin(__atomic_store_n) \
- && __has_builtin(__atomic_add_fetch) \
- && __has_builtin(__atomic_compare_exchange_n) \
- && defined(__ATOMIC_RELAXED) \
- && defined(__ATOMIC_CONSUME) \
- && defined(__ATOMIC_ACQUIRE) \
- && defined(__ATOMIC_RELEASE) \
- && defined(__ATOMIC_ACQ_REL) \
- && defined(__ATOMIC_SEQ_CST)
-# define _LIBCPP_HAS_ATOMIC_BUILTINS
-#elif !defined(__clang__) && defined(_GNUC_VER) && _GNUC_VER >= 407
-# define _LIBCPP_HAS_ATOMIC_BUILTINS
-#endif
-
-#if !defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS)
-# if defined(_MSC_VER) && !defined(__clang__)
- _LIBCPP_WARNING("Building libc++ without __atomic builtins is unsupported")
-# else
-# warning Building libc++ without __atomic builtins is unsupported
-# endif
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-namespace {
-
-#if defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS)
-
-enum __libcpp_atomic_order {
- _AO_Relaxed = __ATOMIC_RELAXED,
- _AO_Consume = __ATOMIC_CONSUME,
- _AO_Acquire = __ATOMIC_ACQUIRE,
- _AO_Release = __ATOMIC_RELEASE,
- _AO_Acq_Rel = __ATOMIC_ACQ_REL,
- _AO_Seq = __ATOMIC_SEQ_CST
-};
-
-template <class _ValueType, class _FromType>
-inline _LIBCPP_INLINE_VISIBILITY
-void __libcpp_atomic_store(_ValueType* __dest, _FromType __val,
- int __order = _AO_Seq)
-{
- __atomic_store_n(__dest, __val, __order);
-}
-
-template <class _ValueType, class _FromType>
-inline _LIBCPP_INLINE_VISIBILITY
-void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
-{
- __atomic_store_n(__dest, __val, _AO_Relaxed);
-}
-
-template <class _ValueType>
-inline _LIBCPP_INLINE_VISIBILITY
-_ValueType __libcpp_atomic_load(_ValueType const* __val,
- int __order = _AO_Seq)
-{
- return __atomic_load_n(__val, __order);
-}
-
-template <class _ValueType, class _AddType>
-inline _LIBCPP_INLINE_VISIBILITY
-_ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a,
- int __order = _AO_Seq)
-{
- return __atomic_add_fetch(__val, __a, __order);
-}
-
-template <class _ValueType>
-inline _LIBCPP_INLINE_VISIBILITY
-bool __libcpp_atomic_compare_exchange(_ValueType* __val,
- _ValueType* __expected, _ValueType __after,
- int __success_order = _AO_Seq,
- int __fail_order = _AO_Seq)
-{
- return __atomic_compare_exchange_n(__val, __expected, __after, true,
- __success_order, __fail_order);
-}
-
-#else // _LIBCPP_HAS_NO_THREADS
-
-enum __libcpp_atomic_order {
- _AO_Relaxed,
- _AO_Consume,
- _AO_Acquire,
- _AO_Release,
- _AO_Acq_Rel,
- _AO_Seq
-};
-
-template <class _ValueType, class _FromType>
-inline _LIBCPP_INLINE_VISIBILITY
-void __libcpp_atomic_store(_ValueType* __dest, _FromType __val,
- int = 0)
-{
- *__dest = __val;
-}
-
-template <class _ValueType, class _FromType>
-inline _LIBCPP_INLINE_VISIBILITY
-void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
-{
- *__dest = __val;
-}
-
-template <class _ValueType>
-inline _LIBCPP_INLINE_VISIBILITY
-_ValueType __libcpp_atomic_load(_ValueType const* __val,
- int = 0)
-{
- return *__val;
-}
-
-template <class _ValueType, class _AddType>
-inline _LIBCPP_INLINE_VISIBILITY
-_ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a,
- int = 0)
-{
- return *__val += __a;
-}
-
-template <class _ValueType>
-inline _LIBCPP_INLINE_VISIBILITY
-bool __libcpp_atomic_compare_exchange(_ValueType* __val,
- _ValueType* __expected, _ValueType __after,
- int = 0, int = 0)
-{
- if (*__val == *__expected) {
- *__val = __after;
- return true;
- }
- *__expected = *__val;
- return false;
-}
-
-#endif // _LIBCPP_HAS_NO_THREADS
-
-} // end namespace
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // ATOMIC_SUPPORT_H
Index: libcxx/include/memory
===================================================================
--- libcxx/include/memory
+++ libcxx/include/memory
@@ -638,6 +638,8 @@
#include <stdexcept>
#include <cstring>
+#include <__atomic_support>
+
#if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
# include <atomic>
#endif
@@ -3788,12 +3790,34 @@
#endif // _LIBCPP_STD_VER > 14
+namespace
+{
+// NOTE: Relaxed and acq/rel atomics (for increment and decrement respectively)
+// should be sufficient for thread safety.
+// See https://llvm.org/bugs/show_bug.cgi?id=22803
+template <class T> __attribute__((always_inline))
+inline _LIBCPP_INLINE_VISIBILITY T
+increment(T& t) _NOEXCEPT
+{
+ return __libcpp_atomic_add(&t, 1, _AO_Relaxed);
+}
+
+template <class T> __attribute__((always_inline))
+inline _LIBCPP_INLINE_VISIBILITY T
+decrement(T& t) _NOEXCEPT
+{
+ return __libcpp_atomic_add(&t, -1, _AO_Acq_Rel);
+}
+} // namespace
+
class _LIBCPP_EXCEPTION_ABI bad_weak_ptr
: public std::exception
{
public:
virtual ~bad_weak_ptr() _NOEXCEPT;
- virtual const char* what() const _NOEXCEPT;
+ virtual const char* what() const _NOEXCEPT {
+ return "bad_weak_ptr";
+ }
};
_LIBCPP_NORETURN inline _LIBCPP_ALWAYS_INLINE
@@ -3824,8 +3848,18 @@
explicit __shared_count(long __refs = 0) _NOEXCEPT
: __shared_owners_(__refs) {}
- void __add_shared() _NOEXCEPT;
- bool __release_shared() _NOEXCEPT;
+ inline _LIBCPP_INLINE_VISIBILITY
+ void __add_shared() _NOEXCEPT {
+ increment(__shared_owners_);
+ }
+ inline _LIBCPP_INLINE_VISIBILITY
+ bool __release_shared() _NOEXCEPT {
+ if (decrement(__shared_owners_) == -1) {
+ __on_zero_shared();
+ return true;
+ }
+ return false;
+ }
_LIBCPP_INLINE_VISIBILITY
long use_count() const _NOEXCEPT {
return __libcpp_relaxed_load(&__shared_owners_) + 1;
@@ -3846,9 +3880,19 @@
virtual ~__shared_weak_count();
public:
- void __add_shared() _NOEXCEPT;
- void __add_weak() _NOEXCEPT;
- void __release_shared() _NOEXCEPT;
+ inline _LIBCPP_INLINE_VISIBILITY
+ void __add_shared() _NOEXCEPT {
+ __shared_count::__add_shared();
+ }
+ inline _LIBCPP_INLINE_VISIBILITY
+ void __add_weak() _NOEXCEPT {
+ increment(__shared_weak_owners_);
+ }
+ inline _LIBCPP_INLINE_VISIBILITY
+ void __release_shared() _NOEXCEPT {
+ if (__shared_count::__release_shared())
+ __release_weak();
+ }
void __release_weak() _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
long use_count() const _NOEXCEPT {return __shared_count::use_count();}
Index: libcxx/include/__atomic_support
===================================================================
--- /dev/null
+++ libcxx/include/__atomic_support
@@ -0,0 +1,157 @@
+//===----------------------------------------------------------------------===////
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===////
+
+#ifndef ATOMIC_SUPPORT_H
+#define ATOMIC_SUPPORT_H
+
+#include <__config>
+
+#if defined(__clang__) && __has_builtin(__atomic_load_n) \
+ && __has_builtin(__atomic_store_n) \
+ && __has_builtin(__atomic_add_fetch) \
+ && __has_builtin(__atomic_compare_exchange_n) \
+ && defined(__ATOMIC_RELAXED) \
+ && defined(__ATOMIC_CONSUME) \
+ && defined(__ATOMIC_ACQUIRE) \
+ && defined(__ATOMIC_RELEASE) \
+ && defined(__ATOMIC_ACQ_REL) \
+ && defined(__ATOMIC_SEQ_CST)
+# define _LIBCPP_HAS_ATOMIC_BUILTINS
+#elif !defined(__clang__) && defined(_GNUC_VER) && _GNUC_VER >= 407
+# define _LIBCPP_HAS_ATOMIC_BUILTINS
+#endif
+
+#if !defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS)
+# if defined(_MSC_VER) && !defined(__clang__)
+ _LIBCPP_WARNING("Building libc++ without __atomic builtins is unsupported")
+# else
+# warning Building libc++ without __atomic builtins is unsupported
+# endif
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace {
+
+#if defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS)
+
+enum __libcpp_atomic_order {
+ _AO_Relaxed = __ATOMIC_RELAXED,
+ _AO_Consume = __ATOMIC_CONSUME,
+ _AO_Acquire = __ATOMIC_ACQUIRE,
+ _AO_Release = __ATOMIC_RELEASE,
+ _AO_Acq_Rel = __ATOMIC_ACQ_REL,
+ _AO_Seq = __ATOMIC_SEQ_CST
+};
+
+template <class _ValueType, class _FromType>
+inline _LIBCPP_INLINE_VISIBILITY
+void __libcpp_atomic_store(_ValueType* __dest, _FromType __val,
+ int __order = _AO_Seq)
+{
+ __atomic_store_n(__dest, __val, __order);
+}
+
+template <class _ValueType, class _FromType>
+inline _LIBCPP_INLINE_VISIBILITY
+void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
+{
+ __atomic_store_n(__dest, __val, _AO_Relaxed);
+}
+
+template <class _ValueType>
+inline _LIBCPP_INLINE_VISIBILITY
+_ValueType __libcpp_atomic_load(_ValueType const* __val,
+ int __order = _AO_Seq)
+{
+ return __atomic_load_n(__val, __order);
+}
+
+template <class _ValueType, class _AddType>
+inline _LIBCPP_INLINE_VISIBILITY
+_ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a,
+ int __order = _AO_Seq)
+{
+ return __atomic_add_fetch(__val, __a, __order);
+}
+
+template <class _ValueType>
+inline _LIBCPP_INLINE_VISIBILITY
+bool __libcpp_atomic_compare_exchange(_ValueType* __val,
+ _ValueType* __expected, _ValueType __after,
+ int __success_order = _AO_Seq,
+ int __fail_order = _AO_Seq)
+{
+ return __atomic_compare_exchange_n(__val, __expected, __after, true,
+ __success_order, __fail_order);
+}
+
+#else // _LIBCPP_HAS_NO_THREADS
+
+enum __libcpp_atomic_order {
+ _AO_Relaxed,
+ _AO_Consume,
+ _AO_Acquire,
+ _AO_Release,
+ _AO_Acq_Rel,
+ _AO_Seq
+};
+
+template <class _ValueType, class _FromType>
+inline _LIBCPP_INLINE_VISIBILITY
+void __libcpp_atomic_store(_ValueType* __dest, _FromType __val,
+ int = 0)
+{
+ *__dest = __val;
+}
+
+template <class _ValueType, class _FromType>
+inline _LIBCPP_INLINE_VISIBILITY
+void __libcpp_relaxed_store(_ValueType* __dest, _FromType __val)
+{
+ *__dest = __val;
+}
+
+template <class _ValueType>
+inline _LIBCPP_INLINE_VISIBILITY
+_ValueType __libcpp_atomic_load(_ValueType const* __val,
+ int = 0)
+{
+ return *__val;
+}
+
+template <class _ValueType, class _AddType>
+inline _LIBCPP_INLINE_VISIBILITY
+_ValueType __libcpp_atomic_add(_ValueType* __val, _AddType __a,
+ int = 0)
+{
+ return *__val += __a;
+}
+
+template <class _ValueType>
+inline _LIBCPP_INLINE_VISIBILITY
+bool __libcpp_atomic_compare_exchange(_ValueType* __val,
+ _ValueType* __expected, _ValueType __after,
+ int = 0, int = 0)
+{
+ if (*__val == *__expected) {
+ *__val = __after;
+ return true;
+ }
+ *__expected = *__val;
+ return false;
+}
+
+#endif // _LIBCPP_HAS_NO_THREADS
+
+} // end namespace
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // ATOMIC_SUPPORT_H
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