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/*
* Copyright (C) 2017-2023 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/Ref.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
class JSWebAssemblyGlobal;
namespace Wasm {
class Global final : public ThreadSafeRefCounted<Global> {
WTF_MAKE_NONCOPYABLE(Global);
WTF_MAKE_TZONE_ALLOCATED(Global);
public:
union Value {
v128_t m_vector { };
uint64_t m_primitive;
WriteBarrierBase<Unknown> m_externref;
Value* m_pointer;
};
static_assert(sizeof(Value) == 16, "Update LLInt if this changes");
static Ref<Global> create(Wasm::Type type, Wasm::Mutability mutability, uint64_t initialValue = 0)
{
return adoptRef(*new Global(type, mutability, initialValue));
}
static Ref<Global> create(Wasm::Type type, Wasm::Mutability mutability, v128_t initialValue)
{
return adoptRef(*new Global(type, mutability, initialValue));
}
Wasm::Type type() const { return m_type; }
Wasm::Mutability mutability() const { return m_mutability; }
JSValue get(JSGlobalObject*) const;
uint64_t getPrimitive() const { return m_value.m_primitive; }
v128_t getVector() const { return m_value.m_vector; }
void set(JSGlobalObject*, JSValue);
DECLARE_VISIT_AGGREGATE;
JSWebAssemblyGlobal* owner() const { return m_owner; }
void setOwner(JSWebAssemblyGlobal* owner)
{
ASSERT(!m_owner);
ASSERT(owner);
m_owner = owner;
}
static constexpr ptrdiff_t offsetOfValue() { ASSERT(!OBJECT_OFFSETOF(Value, m_primitive)); ASSERT(!OBJECT_OFFSETOF(Value, m_externref)); return OBJECT_OFFSETOF(Global, m_value); }
static constexpr ptrdiff_t offsetOfOwner() { return OBJECT_OFFSETOF(Global, m_owner); }
static Global& fromBinding(Value& value)
{
return *std::bit_cast<Global*>(std::bit_cast<uint8_t*>(&value) - offsetOfValue());
}
Value* valuePointer() { return &m_value; }
private:
Global(Wasm::Type type, Wasm::Mutability mutability, uint64_t initialValue)
: m_type(type)
, m_mutability(mutability)
{
ASSERT(m_type != Types::V128);
m_value.m_primitive = initialValue;
}
Global(Wasm::Type type, Wasm::Mutability mutability, v128_t initialValue)
: m_type(type)
, m_mutability(mutability)
{
ASSERT(m_type == Types::V128);
m_value.m_vector = initialValue;
}
Wasm::Type m_type;
Wasm::Mutability m_mutability;
JSWebAssemblyGlobal* m_owner { nullptr };
Value m_value;
};
} } // namespace JSC::Wasm
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY)
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