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//===------------------------ memory.cpp ----------------------------------===//
//
// ΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚThe LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "memory"
#include <libkern/OSAtomic.h>
_LIBCPP_BEGIN_NAMESPACE_STD
namespace
{
template <class T>
inline
typename enable_if
<
sizeof(T) * __CHAR_BIT__ == 32,
T
>::type
increment(T& t)
{
return OSAtomicIncrement32Barrier((volatile int32_t*)&t);
}
template <class T>
inline
typename enable_if
<
sizeof(T) * __CHAR_BIT__ == 32,
T
>::type
decrement(T& t)
{
return OSAtomicDecrement32Barrier((volatile int32_t*)&t);
}
#ifndef __ppc__
template <class T>
inline
typename enable_if
<
sizeof(T) * __CHAR_BIT__ == 64,
T
>::type
increment(T& t)
{
return OSAtomicIncrement64Barrier((volatile int64_t*)&t);
}
template <class T>
inline
typename enable_if
<
sizeof(T) * __CHAR_BIT__ == 64,
T
>::type
decrement(T& t)
{
return OSAtomicDecrement64Barrier((volatile int64_t*)&t);
}
#endif
} // namespace
const allocator_arg_t allocator_arg = allocator_arg_t();
bad_weak_ptr::~bad_weak_ptr() throw() {}
const char*
bad_weak_ptr::what() const throw()
{
return "bad_weak_ptr";
}
__shared_count::~__shared_count()
{
}
void
__shared_count::__add_shared()
{
increment(__shared_owners_);
}
void
__shared_count::__release_shared()
{
if (decrement(__shared_owners_) == -1)
__on_zero_shared();
}
__shared_weak_count::~__shared_weak_count()
{
}
void
__shared_weak_count::__add_shared()
{
__shared_count::__add_shared();
__add_weak();
}
void
__shared_weak_count::__add_weak()
{
increment(__shared_weak_owners_);
}
void
__shared_weak_count::__release_shared()
{
__shared_count::__release_shared();
__release_weak();
}
void
__shared_weak_count::__release_weak()
{
if (decrement(__shared_weak_owners_) == -1)
__on_zero_shared_weak();
}
__shared_weak_count*
__shared_weak_count::lock()
{
long object_owners = __shared_owners_;
while (object_owners != -1)
{
if (OSAtomicCompareAndSwapLongBarrier(object_owners,
object_owners+1,
&__shared_owners_))
{
__add_weak();
return this;
}
object_owners = __shared_owners_;
}
return 0;
}
const void*
__shared_weak_count::__get_deleter(const type_info&) const
{
return 0;
}
void
declare_reachable(void*)
{
}
void
declare_no_pointers(char*, size_t)
{
}
void
undeclare_no_pointers(char*, size_t)
{
}
pointer_safety
get_pointer_safety()
{
return pointer_safety::relaxed;
}
void*
__undeclare_reachable(void* p)
{
return p;
}
void*
align(size_t alignment, size_t size, void*& ptr, size_t& space)
{
void* r = nullptr;
if (size <= space)
{
char* p1 = static_cast<char*>(ptr);
char* p2 = (char*)((size_t)(p1 + (alignment - 1)) & -alignment);
ptrdiff_t d = p2 - p1;
if (d <= space - size)
{
r = p2;
ptr = r;
space -= d;
}
}
return r;
}
_LIBCPP_END_NAMESPACE_STD
|
