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/*
* Copyright (C) 2017-2024 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 "SlotVisitorMacros.h"
#include "WasmFormat.h"
#include "WasmLimits.h"
#include "WriteBarrier.h"
#include <wtf/MallocPtr.h>
#include <wtf/Ref.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace JSC {
class JSWebAssemblyTable;
namespace Wasm {
class FuncRefTable;
class Table : public ThreadSafeRefCounted<Table> {
WTF_MAKE_NONCOPYABLE(Table);
WTF_MAKE_TZONE_ALLOCATED(Table);
public:
static RefPtr<Table> tryCreate(uint32_t initial, std::optional<uint32_t> maximum, TableElementType, Type);
JS_EXPORT_PRIVATE ~Table() = default;
std::optional<uint32_t> maximum() const { return m_maximum; }
uint32_t length() const { return m_length; }
static constexpr ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(Table, m_length); }
static uint32_t allocatedLength(uint32_t length);
JSWebAssemblyTable* owner() const { return m_owner; }
void setOwner(JSWebAssemblyTable* owner)
{
ASSERT(!m_owner);
ASSERT(owner);
m_owner = owner;
}
TableElementType type() const { return m_type; }
bool isExternrefTable() const { return m_type == TableElementType::Externref; }
bool isFuncrefTable() const { return m_type == TableElementType::Funcref; }
Type wasmType() const { return m_wasmType; }
FuncRefTable* asFuncrefTable();
static bool isValidLength(uint32_t length) { return length < maxTableEntries; }
void clear(uint32_t);
void set(uint32_t, JSValue);
JSValue get(uint32_t) const;
std::optional<uint32_t> grow(uint32_t delta, JSValue defaultValue);
void copy(const Table* srcTable, uint32_t dstIndex, uint32_t srcIndex);
DECLARE_VISIT_AGGREGATE;
void operator delete(Table*, std::destroying_delete_t);
protected:
Table(uint32_t initial, std::optional<uint32_t> maximum, Type, TableElementType = TableElementType::Externref);
template<typename Visitor> constexpr decltype(auto) visitDerived(Visitor&&);
template<typename Visitor> constexpr decltype(auto) visitDerived(Visitor&&) const;
void setLength(uint32_t);
bool isFixedSized() const { return m_isFixedSized; }
uint32_t m_length;
NO_UNIQUE_ADDRESS const std::optional<uint32_t> m_maximum;
const TableElementType m_type;
Type m_wasmType;
bool m_isFixedSized { false };
JSWebAssemblyTable* m_owner;
};
class ExternRefTable final : public Table {
WTF_MAKE_TZONE_ALLOCATED(ExternRefTable);
public:
friend class Table;
void clear(uint32_t);
void set(uint32_t, JSValue);
JSValue get(uint32_t index) const { return m_jsValues.get()[index].get(); }
private:
ExternRefTable(uint32_t initial, std::optional<uint32_t> maximum, Type wasmType);
MallocPtr<WriteBarrier<Unknown>, VMMalloc> m_jsValues;
};
class FuncRefTable final : public Table {
WTF_MAKE_TZONE_ALLOCATED(FuncRefTable);
public:
friend class Table;
JS_EXPORT_PRIVATE ~FuncRefTable();
// 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 JSWebAssemblyInstance here because the js ensures that Table keeps all the instances alive.
struct Function {
WasmToWasmImportableFunction m_function;
JSWebAssemblyInstance* m_instance { nullptr };
WriteBarrier<Unknown> m_value { NullWriteBarrierTag };
static constexpr ptrdiff_t offsetOfFunction() { return OBJECT_OFFSETOF(Function, m_function); }
static constexpr ptrdiff_t offsetOfInstance() { return OBJECT_OFFSETOF(Function, m_instance); }
static constexpr ptrdiff_t offsetOfValue() { return OBJECT_OFFSETOF(Function, m_value); }
};
void setFunction(uint32_t, JSObject*, WasmToWasmImportableFunction, JSWebAssemblyInstance*);
const Function& function(uint32_t) const;
void copyFunction(const FuncRefTable* srcTable, uint32_t dstIndex, uint32_t srcIndex);
static constexpr ptrdiff_t offsetOfFunctions() { return OBJECT_OFFSETOF(FuncRefTable, m_importableFunctions); }
static constexpr ptrdiff_t offsetOfTail() { return WTF::roundUpToMultipleOf<alignof(Function)>(sizeof(FuncRefTable)); }
static constexpr ptrdiff_t offsetOfFunctionsForFixedSizedTable() { return offsetOfTail(); }
static size_t allocationSize(uint32_t size)
{
return offsetOfTail() + sizeof(Function) * size;
}
void clear(uint32_t);
void set(uint32_t, JSValue);
JSValue get(uint32_t index) const { return m_importableFunctions.get()[index].m_value.get(); }
private:
FuncRefTable(uint32_t initial, std::optional<uint32_t> maximum, Type wasmType);
Function* tailPointer() { return bitwise_cast<Function*>(bitwise_cast<uint8_t*>(this) + offsetOfTail()); }
static Ref<FuncRefTable> createFixedSized(uint32_t size, Type wasmType);
MallocPtr<Function, VMMalloc> m_importableFunctions;
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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