/* * Copyright (C) 2016 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 #include <wtf/StdLibExtras.h> namespace JSC { #if USE(JSVALUE64) // According to C++ rules, a type used for the return signature of function with C linkage (i.e. // 'extern "C"') needs to be POD; hence putting any constructors into it could cause either compiler // warnings, or worse, a change in the ABI used to return these types. struct SlowPathReturnType { void* a; void* b; }; inline SlowPathReturnType encodeResult(void* a, void* b) { SlowPathReturnType result; result.a = a; result.b = b; return result; } inline void decodeResult(SlowPathReturnType result, void*& a, void*& b) { a = result.a; b = result.b; } #else // USE(JSVALUE32_64) typedef int64_t SlowPathReturnType; typedef union { struct { void* a; void* b; } pair; int64_t i; } SlowPathReturnTypeEncoding; inline SlowPathReturnType encodeResult(void* a, void* b) { SlowPathReturnTypeEncoding u; u.pair.a = a; u.pair.b = b; return u.i; } inline void decodeResult(SlowPathReturnType result, void*& a, void*& b) { SlowPathReturnTypeEncoding u; u.i = result; a = u.pair.a; b = u.pair.b; } #endif // USE(JSVALUE32_64) } // namespace JSC