1 //===------------------------ memory.cpp ----------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 _LIBCPP_BEGIN_NAMESPACE_STD
19 increment(T& t) _NOEXCEPT
21 return __sync_add_and_fetch(&t, 1);
26 decrement(T& t) _NOEXCEPT
28 return __sync_add_and_fetch(&t, -1);
33 const allocator_arg_t allocator_arg = allocator_arg_t();
35 bad_weak_ptr::~bad_weak_ptr() _NOEXCEPT {}
38 bad_weak_ptr::what() const _NOEXCEPT
40 return "bad_weak_ptr";
43 __shared_count::~__shared_count()
48 __shared_count::__add_shared() _NOEXCEPT
50 increment(__shared_owners_);
54 __shared_count::__release_shared() _NOEXCEPT
56 if (decrement(__shared_owners_) == -1)
64 __shared_weak_count::~__shared_weak_count()
69 __shared_weak_count::__add_shared() _NOEXCEPT
71 __shared_count::__add_shared();
75 __shared_weak_count::__add_weak() _NOEXCEPT
77 increment(__shared_weak_owners_);
81 __shared_weak_count::__release_shared() _NOEXCEPT
83 if (__shared_count::__release_shared())
88 __shared_weak_count::__release_weak() _NOEXCEPT
90 if (decrement(__shared_weak_owners_) == -1)
91 __on_zero_shared_weak();
95 __shared_weak_count::lock() _NOEXCEPT
97 long object_owners = __shared_owners_;
98 while (object_owners != -1)
100 if (__sync_bool_compare_and_swap(&__shared_owners_,
104 object_owners = __shared_owners_;
109 #ifndef _LIBCPP_NO_RTTI
112 __shared_weak_count::__get_deleter(const type_info&) const _NOEXCEPT
117 #endif // _LIBCPP_NO_RTTI
120 declare_reachable(void*)
125 declare_no_pointers(char*, size_t)
130 undeclare_no_pointers(char*, size_t)
135 get_pointer_safety() _NOEXCEPT
137 return pointer_safety::relaxed;
141 __undeclare_reachable(void* p)
147 align(size_t alignment, size_t size, void*& ptr, size_t& space)
152 char* p1 = static_cast<char*>(ptr);
153 char* p2 = (char*)((size_t)(p1 + (alignment - 1)) & -alignment);
154 size_t d = static_cast<size_t>(p2 - p1);
155 if (d <= space - size)
165 _LIBCPP_END_NAMESPACE_STD