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/*
* 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"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
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(std::bit_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(std::bit_cast<JSCell*>(SCRIBBLE_WORD));
}
}
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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