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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 "WasmMemoryMode.h"
#include "WasmPageCount.h"
#include <wtf/CagedPtr.h>
#include <wtf/Expected.h>
#include <wtf/Function.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
#include <wtf/WeakPtr.h>
namespace WTF {
class PrintStream;
}
namespace JSC {
class LLIntOffsetsExtractor;
namespace Wasm {
class Instance;
class MemoryHandle final : public ThreadSafeRefCounted<MemoryHandle> {
WTF_MAKE_NONCOPYABLE(MemoryHandle);
WTF_MAKE_FAST_ALLOCATED;
friend LLIntOffsetsExtractor;
public:
MemoryHandle(void*, size_t size, size_t mappedCapacity, PageCount initial, PageCount maximum, MemorySharingMode, MemoryMode);
JS_EXPORT_PRIVATE ~MemoryHandle();
void* memory() const;
size_t size() const { return m_size; }
size_t mappedCapacity() const { return m_mappedCapacity; }
size_t boundsCheckingSize() const { return m_mappedCapacity; }
PageCount initial() const { return m_initial; }
PageCount maximum() const { return m_maximum; }
MemorySharingMode sharingMode() const { return m_sharingMode; }
MemoryMode mode() const { return m_mode; }
static ptrdiff_t offsetOfSize() { return OBJECT_OFFSETOF(MemoryHandle, m_size); }
Lock& lock() { return m_lock; }
void growToSize(size_t size)
{
m_size = size;
}
private:
using CagedMemory = CagedPtr<Gigacage::Primitive, void, tagCagedPtr>;
Lock m_lock;
MemorySharingMode m_sharingMode { MemorySharingMode::Default };
MemoryMode m_mode { MemoryMode::BoundsChecking };
CagedMemory m_memory;
size_t m_size { 0 };
size_t m_mappedCapacity { 0 };
PageCount m_initial;
PageCount m_maximum;
};
class Memory final : public RefCounted<Memory> {
WTF_MAKE_NONCOPYABLE(Memory);
WTF_MAKE_FAST_ALLOCATED;
friend LLIntOffsetsExtractor;
public:
void dump(WTF::PrintStream&) const;
explicit operator bool() const { return !!m_handle->memory(); }
enum NotifyPressure { NotifyPressureTag };
enum SyncTryToReclaim { SyncTryToReclaimTag };
enum GrowSuccess { GrowSuccessTag };
static Ref<Memory> create();
JS_EXPORT_PRIVATE static Ref<Memory> create(Ref<MemoryHandle>&&, WTF::Function<void(NotifyPressure)>&& notifyMemoryPressure, WTF::Function<void(SyncTryToReclaim)>&& syncTryToReclaimMemory, WTF::Function<void(GrowSuccess, PageCount, PageCount)>&& growSuccessCallback);
static RefPtr<Memory> tryCreate(PageCount initial, PageCount maximum, MemorySharingMode, WTF::Function<void(NotifyPressure)>&& notifyMemoryPressure, WTF::Function<void(SyncTryToReclaim)>&& syncTryToReclaimMemory, WTF::Function<void(GrowSuccess, PageCount, PageCount)>&& growSuccessCallback);
JS_EXPORT_PRIVATE ~Memory();
static size_t fastMappedRedzoneBytes();
static size_t fastMappedBytes(); // Includes redzone.
static bool addressIsInGrowableOrFastMemory(void*);
void* memory() const { return m_handle->memory(); }
size_t size() const { return m_handle->size(); }
PageCount sizeInPages() const { return PageCount::fromBytes(size()); }
size_t boundsCheckingSize() const { return m_handle->boundsCheckingSize(); }
PageCount initial() const { return m_handle->initial(); }
PageCount maximum() const { return m_handle->maximum(); }
MemoryHandle& handle() { return m_handle.get(); }
MemorySharingMode sharingMode() const { return m_handle->sharingMode(); }
MemoryMode mode() const { return m_handle->mode(); }
enum class GrowFailReason {
InvalidDelta,
InvalidGrowSize,
WouldExceedMaximum,
OutOfMemory,
};
Expected<PageCount, GrowFailReason> grow(PageCount);
bool fill(uint32_t, uint8_t, uint32_t);
bool copy(uint32_t, uint32_t, uint32_t);
bool init(uint32_t, const uint8_t*, uint32_t);
void registerInstance(Instance*);
void check() { ASSERT(!deletionHasBegun()); }
static ptrdiff_t offsetOfHandle() { return OBJECT_OFFSETOF(Memory, m_handle); }
private:
Memory();
Memory(Ref<MemoryHandle>&&, WTF::Function<void(NotifyPressure)>&& notifyMemoryPressure, WTF::Function<void(SyncTryToReclaim)>&& syncTryToReclaimMemory, WTF::Function<void(GrowSuccess, PageCount, PageCount)>&& growSuccessCallback);
Memory(PageCount initial, PageCount maximum, MemorySharingMode, WTF::Function<void(NotifyPressure)>&& notifyMemoryPressure, WTF::Function<void(SyncTryToReclaim)>&& syncTryToReclaimMemory, WTF::Function<void(GrowSuccess, PageCount, PageCount)>&& growSuccessCallback);
Expected<PageCount, GrowFailReason> growShared(PageCount);
Ref<MemoryHandle> m_handle;
WTF::Function<void(NotifyPressure)> m_notifyMemoryPressure;
WTF::Function<void(SyncTryToReclaim)> m_syncTryToReclaimMemory;
WTF::Function<void(GrowSuccess, PageCount, PageCount)> m_growSuccessCallback;
Vector<WeakPtr<Instance>> m_instances;
};
} } // namespace JSC::Wasm
#else
namespace JSC { namespace Wasm {
class Memory {
public:
static size_t maxFastMemoryCount() { return 0; }
static bool addressIsInGrowableOrFastMemory(void*) { return false; }
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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