/* * Copyright (C) 2018-2020 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #if CPU(ARM64E) #include <ptrauth.h> #endif namespace WTF { #if COMPILER_HAS_CLANG_BUILTIN(__builtin_get_vtable_pointer) template<typename T> ALWAYS_INLINE const void* getVTablePointer(T* o) { return __builtin_get_vtable_pointer(o); } #else // not COMPILER_HAS_CLANG_BUILTIN(__builtin_get_vtable_pointer) #if CPU(ARM64E) template<typename T> ALWAYS_INLINE const void* getVTablePointer(T* o) { return __builtin_ptrauth_auth(*(reinterpret_cast<void**>(o)), ptrauth_key_cxx_vtable_pointer, 0); } #else // not CPU(ARM64E) template<typename T> ALWAYS_INLINE const void* getVTablePointer(T* o) { return (*(reinterpret_cast<void**>(o))); } #endif // not CPU(ARM64E) #endif // not COMPILER_HAS_CLANG_BUILTIN(__builtin_get_vtable_pointer) } // namespace WTF using WTF::getVTablePointer;