Add libc++ and libc++abi to third-party.

third_party/libcxx/src/memory.cpp

+//===------------------------ memory.cpp ----------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#define _LIBCPP_BUILDING_MEMORY
+#include "memory"
+#include "mutex"
+#include "thread"
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace
+{
+
+template <class T>
+inline T
+increment(T& t) _NOEXCEPT
+{
+    return __sync_add_and_fetch(&t, 1);
+}
+
+template <class T>
+inline T
+decrement(T& t) _NOEXCEPT
+{
+    return __sync_add_and_fetch(&t, -1);
+}
+
+}  // 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()
+{
+}
+
+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();
+}
+
+void
+__shared_weak_count::__release_weak() _NOEXCEPT
+{
+    if (decrement(__shared_weak_owners_) == -1)
+        __on_zero_shared_weak();
+}
+
+__shared_weak_count*
+__shared_weak_count::lock() _NOEXCEPT
+{
+    long object_owners = __shared_owners_;
+    while (object_owners != -1)
+    {
+        if (__sync_bool_compare_and_swap(&__shared_owners_,
+                                         object_owners,
+                                         object_owners+1))
+            return this;
+        object_owners = __shared_owners_;
+    }
+    return 0;
+}
+
+#ifndef _LIBCPP_NO_RTTI
+
+const void*
+__shared_weak_count::__get_deleter(const type_info&) const _NOEXCEPT
+{
+    return 0;
+}
+
+#endif  // _LIBCPP_NO_RTTI
+
+#if __has_feature(cxx_atomic)
+
+static const std::size_t __sp_mut_count = 16;
+static pthread_mutex_t mut_back_imp[__sp_mut_count] =
+{
+    PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
+    PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
+    PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
+    PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER
+};
+
+static mutex* mut_back = reinterpret_cast<std::mutex*>(mut_back_imp);
+
+_LIBCPP_CONSTEXPR __sp_mut::__sp_mut(void* p) _NOEXCEPT
+   : __lx(p)
+{
+}
+
+void
+__sp_mut::lock() _NOEXCEPT
+{
+    mutex& m = *static_cast<mutex*>(__lx);
+    unsigned count = 0;
+    while (!m.try_lock())
+    {
+        if (++count > 16)
+        {
+            m.lock();
+            break;
+        }
+        this_thread::yield();
+    }
+}
+
+void
+__sp_mut::unlock() _NOEXCEPT
+{
+    static_cast<mutex*>(__lx)->unlock();
+}
+
+__sp_mut&
+__get_sp_mut(const void* p)
+{
+    static __sp_mut muts[__sp_mut_count] 
+    {
+        &mut_back[ 0], &mut_back[ 1], &mut_back[ 2], &mut_back[ 3],
+        &mut_back[ 4], &mut_back[ 5], &mut_back[ 6], &mut_back[ 7],
+        &mut_back[ 8], &mut_back[ 9], &mut_back[10], &mut_back[11],
+        &mut_back[12], &mut_back[13], &mut_back[14], &mut_back[15]
+    };
+    return muts[hash<const void*>()(p) & (__sp_mut_count-1)];
+}
+
+#endif // __has_feature(cxx_atomic)
+
+void
+declare_reachable(void*)
+{
+}
+
+void
+declare_no_pointers(char*, size_t)
+{
+}
+
+void
+undeclare_no_pointers(char*, size_t)
+{
+}
+
+pointer_safety
+get_pointer_safety() _NOEXCEPT
+{
+    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);
+        size_t d = static_cast<size_t>(p2 - p1);
+        if (d <= space - size)
+        {
+            r = p2;
+            ptr = r;
+            space -= d;
+        }
+    }
+    return r;
+}
+
+_LIBCPP_END_NAMESPACE_STD