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/*
* Copyright (C) 2016 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 "WasmCallingConvention.h"
#include "WasmPageCount.h"
namespace WTF {
class PrintStream;
}
namespace JSC { namespace Wasm {
class Memory {
WTF_MAKE_NONCOPYABLE(Memory);
WTF_MAKE_FAST_ALLOCATED;
public:
void dump(WTF::PrintStream&) const;
// FIXME: We should support other modes. see: https://bugs.webkit.org/show_bug.cgi?id=162693
enum class Mode {
BoundsChecking
};
const char* makeString(Mode) const;
Memory() = default;
JS_EXPORT_PRIVATE Memory(PageCount initial, PageCount maximum, bool& failed);
Memory(Memory&& other)
: m_memory(other.m_memory)
, m_size(other.m_size)
, m_initial(other.m_initial)
, m_maximum(other.m_maximum)
, m_mappedCapacity(other.m_mappedCapacity)
, m_mode(other.m_mode)
{
// Moving transfers ownership of the allocated memory.
other.m_memory = nullptr;
}
~Memory();
void* memory() const { return m_memory; }
uint64_t size() const { return m_size; }
PageCount sizeInPages() const { return PageCount::fromBytes(m_size); }
PageCount initial() const { return m_initial; }
PageCount maximum() const { return m_maximum; }
Mode mode() const { return m_mode; }
bool grow(PageCount);
static ptrdiff_t offsetOfMemory() { return OBJECT_OFFSETOF(Memory, m_memory); }
static ptrdiff_t offsetOfSize() { return OBJECT_OFFSETOF(Memory, m_size); }
private:
void* m_memory { nullptr };
uint64_t m_size { 0 };
PageCount m_initial;
PageCount m_maximum;
uint64_t m_mappedCapacity { 0 };
Mode m_mode { Mode::BoundsChecking };
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMLY)
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