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/*
* Copyright (C) 2017-2018 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 "WasmFormat.h"
#include "WasmLimits.h"
#include <wtf/MallocPtr.h>
#include <wtf/Optional.h>
#include <wtf/Ref.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace JSC { namespace Wasm {
class Instance;
class Table : public ThreadSafeRefCounted<Table> {
public:
static RefPtr<Table> tryCreate(uint32_t initial, Optional<uint32_t> maximum);
JS_EXPORT_PRIVATE ~Table();
Optional<uint32_t> maximum() const { return m_maximum; }
uint32_t length() const { return m_length; }
Optional<uint32_t> grow(uint32_t delta) WARN_UNUSED_RETURN;
void clearFunction(uint32_t);
void setFunction(uint32_t, WasmToWasmImportableFunction, Instance*);
static ptrdiff_t offsetOfFunctions() { return OBJECT_OFFSETOF(Table, m_importableFunctions); }
static ptrdiff_t offsetOfInstances() { return OBJECT_OFFSETOF(Table, m_instances); }
static ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(Table, m_length); }
static ptrdiff_t offsetOfMask() { return OBJECT_OFFSETOF(Table, m_mask); }
static uint32_t allocatedLength(uint32_t length);
uint32_t mask() const { return m_mask; }
static bool isValidLength(uint32_t length) { return length < maxTableEntries; }
private:
Table(uint32_t initial, Optional<uint32_t> maximum);
void setLength(uint32_t);
MallocPtr<WasmToWasmImportableFunction> m_importableFunctions;
// call_indirect needs to do an Instance check to potentially context switch when calling a function to another instance. We can hold raw pointers to Instance here because the embedder ensures that Table keeps all the instances alive. We couldn't hold a Ref here because it would cause cycles.
MallocPtr<Instance*> m_instances;
uint32_t m_length;
uint32_t m_mask;
Optional<uint32_t> m_maximum;
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)