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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.
*/
#pragma once
#if ENABLE(WEBASSEMBLY)
#include "GPRInfo.h"
#include "RegisterSet.h"
#include "WasmMemory.h"
#include "WasmPageCount.h"
#include <wtf/Forward.h>
#include <wtf/Ref.h>
#include <wtf/Vector.h>
namespace JSC { namespace Wasm {
struct PinnedSizeRegisterInfo {
GPRReg boundsCheckingSizeRegister;
unsigned sizeOffset;
};
class PinnedRegisterInfo {
public:
PinnedRegisterInfo(GPRReg, GPRReg, GPRReg);
static const PinnedRegisterInfo& get();
RegisterSet toSave(MemoryMode mode) const
{
RegisterSet result;
if (baseMemoryPointer != InvalidGPRReg)
result.set(baseMemoryPointer);
if (wasmContextInstancePointer != InvalidGPRReg)
result.set(wasmContextInstancePointer);
if (mode == MemoryMode::BoundsChecking && boundsCheckingSizeRegister != InvalidGPRReg)
result.set(boundsCheckingSizeRegister);
return result;
}
GPRReg boundsCheckingSizeRegister;
GPRReg baseMemoryPointer;
GPRReg wasmContextInstancePointer;
};
class MemoryInformation {
public:
MemoryInformation()
{
ASSERT(!*this);
}
MemoryInformation(PageCount initial, PageCount maximum, bool isShared, bool isImport);
PageCount initial() const { return m_initial; }
PageCount maximum() const { return m_maximum; }
bool isShared() const { return m_isShared; }
bool isImport() const { return m_isImport; }
explicit operator bool() const { return !!m_initial; }
private:
PageCount m_initial { };
PageCount m_maximum { };
bool m_isShared { false };
bool m_isImport { false };
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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