/* * Copyright (C) 2019 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. AND ITS CONTRIBUTORS ``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 ITS 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 "JSCell.h" #include "Options.h" namespace JSC { inline bool scribbleFreeCells() { return ASSERT_ENABLED || Options::scribbleFreeCells(); } #define SCRIBBLE_WORD static_cast<intptr_t>(0xbadbeef0) inline bool isScribbledValue(JSValue value) { return JSValue::encode(value) == JSValue::encode(bitwise_cast<JSCell*>(SCRIBBLE_WORD)); } inline void scribble(void* base, size_t size) { for (size_t i = size / sizeof(EncodedJSValue); i--;) { // Use a 16-byte aligned value to ensure that it passes the cell check. static_cast<EncodedJSValue*>(base)[i] = JSValue::encode(bitwise_cast<JSCell*>(SCRIBBLE_WORD)); } } }