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Copy pathWasmMemoryInformation.cpp
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60 lines (51 loc) · 2.17 KB
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/*
* Copyright (C) 2016-2017 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.
*/
#include "config.h"
#include "WasmMemoryInformation.h"
#include <limits>
#if ENABLE(WEBASSEMBLY)
#include "WasmContext.h"
#include <wtf/CheckedArithmetic.h>
#include <wtf/NeverDestroyed.h>
namespace JSC { namespace Wasm {
MemoryInformation::MemoryInformation(PageCount initial, PageCount maximum, bool isShared, bool isImport, bool isMemory64)
: m_initial(initial)
, m_maximum(maximum)
, m_isShared(isShared)
, m_isImport(isImport)
, m_addressType(isMemory64)
{
RELEASE_ASSERT(!!m_initial);
RELEASE_ASSERT(!m_maximum || m_maximum >= m_initial);
ASSERT(!!*this);
}
bool MemoryInformation::doesAccessOverflow(uint64_t first, uint64_t second) const
{
if (isMemory64())
return WTF::sumOverflows<uint64_t>(first, second);
return WTF::sumOverflows<uint32_t>(first, second);
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)