/* * Copyright (C) 2017 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 "JSCJSValue.h" #include <wtf/StdLibExtras.h> namespace JSC { namespace Wasm { class Callee; } class JSCell; class CalleeBits { public: CalleeBits() = default; CalleeBits(void* ptr) : m_ptr(ptr) { } CalleeBits& operator=(JSCell* cell) { m_ptr = cell; ASSERT(isCell()); return *this; } #if ENABLE(WEBASSEMBLY) static void* boxWasm(Wasm::Callee* callee) { CalleeBits result(bitwise_cast<void*>(bitwise_cast<uintptr_t>(callee) | TagBitsWasm)); ASSERT(result.isWasm()); return result.rawPtr(); } #endif bool isWasm() const { #if ENABLE(WEBASSEMBLY) return (bitwise_cast<uintptr_t>(m_ptr) & TagWasmMask) == TagBitsWasm; #else return false; #endif } bool isCell() const { return !isWasm(); } JSCell* asCell() const { ASSERT(!isWasm()); return static_cast<JSCell*>(m_ptr); } #if ENABLE(WEBASSEMBLY) Wasm::Callee* asWasmCallee() const { ASSERT(isWasm()); return bitwise_cast<Wasm::Callee*>(bitwise_cast<uintptr_t>(m_ptr) & ~TagBitsWasm); } #endif void* rawPtr() const { return m_ptr; } private: void* m_ptr { nullptr }; }; } // namespace JSC