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/*
* Copyright (C) 2022 Igalia S.L. All rights reserved.
* Copyright (C) 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 "WasmOps.h"
#include "WasmTypeDefinition.h"
#include "WebAssemblyGCObjectBase.h"
namespace JSC {
class JSWebAssemblyArray final : public WebAssemblyGCObjectBase {
friend class LLIntOffsetsExtractor;
public:
using Base = WebAssemblyGCObjectBase;
static constexpr bool needsDestruction = true;
static void destroy(JSCell*);
template<typename CellType, SubspaceAccess mode>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return vm.webAssemblyArraySpace<mode>();
}
DECLARE_EXPORT_INFO;
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(WebAssemblyGCObjectType, StructureFlags), info());
}
template <typename ElementType>
static JSWebAssemblyArray* create(VM& vm, Structure* structure, Wasm::FieldType elementType, size_t size, FixedVector<ElementType>&& payload, RefPtr<const Wasm::RTT> rtt)
{
JSWebAssemblyArray* array = new (NotNull, allocateCell<JSWebAssemblyArray>(vm)) JSWebAssemblyArray(vm, structure, elementType, size, WTFMove(payload), rtt);
array->finishCreation(vm);
return array;
}
DECLARE_VISIT_CHILDREN;
Wasm::FieldType elementType() const { return m_elementType; }
size_t size() const { return m_size; }
EncodedJSValue get(uint32_t index)
{
if (m_elementType.type.is<Wasm::PackedType>()) {
switch (m_elementType.type.as<Wasm::PackedType>()) {
case Wasm::PackedType::I8:
return static_cast<EncodedJSValue>(m_payload8[index]);
case Wasm::PackedType::I16:
return static_cast<EncodedJSValue>(m_payload16[index]);
}
}
// m_element_type must be a type, so we can get its kind
ASSERT(m_elementType.type.is<Wasm::Type>());
switch (m_elementType.type.as<Wasm::Type>().kind) {
case Wasm::TypeKind::I32:
case Wasm::TypeKind::F32:
return static_cast<EncodedJSValue>(m_payload32[index]);
default:
return static_cast<EncodedJSValue>(m_payload64[index]);
}
}
void set(VM& vm, uint32_t index, EncodedJSValue value)
{
if (m_elementType.type.is<Wasm::PackedType>()) {
// `value` is assumed to be an unboxed int32; truncate it to either 8 or 16 bits
ASSERT(value <= UINT32_MAX);
switch (m_elementType.type.as<Wasm::PackedType>()) {
case Wasm::PackedType::I8:
m_payload8[index] = static_cast<uint8_t>(value);
break;
case Wasm::PackedType::I16:
m_payload16[index] = static_cast<uint16_t>(value);
break;
}
return;
}
ASSERT(m_elementType.type.is<Wasm::Type>());
switch (m_elementType.type.as<Wasm::Type>().kind) {
case Wasm::TypeKind::I32:
case Wasm::TypeKind::F32:
m_payload32[index] = static_cast<uint32_t>(value);
break;
case Wasm::TypeKind::I64:
case Wasm::TypeKind::F64:
m_payload64[index] = static_cast<uint64_t>(value);
break;
case Wasm::TypeKind::Externref:
case Wasm::TypeKind::Funcref:
case Wasm::TypeKind::Ref:
case Wasm::TypeKind::RefNull: {
WriteBarrier<Unknown>* pointer = bitwise_cast<WriteBarrier<Unknown>*>(m_payload64.data());
pointer += index;
pointer->set(vm, this, JSValue::decode(value));
break;
}
case Wasm::TypeKind::V128:
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
static ptrdiff_t offsetOfSize() { return OBJECT_OFFSETOF(JSWebAssemblyArray, m_size); }
static ptrdiff_t offsetOfPayload()
{
ASSERT(OBJECT_OFFSETOF(JSWebAssemblyArray, m_payload32) == OBJECT_OFFSETOF(JSWebAssemblyArray, m_payload64));
return OBJECT_OFFSETOF(JSWebAssemblyArray, m_payload32);
}
protected:
JSWebAssemblyArray(VM&, Structure*, Wasm::FieldType, size_t, FixedVector<uint8_t>&&, RefPtr<const Wasm::RTT>);
JSWebAssemblyArray(VM&, Structure*, Wasm::FieldType, size_t, FixedVector<uint16_t>&&, RefPtr<const Wasm::RTT>);
JSWebAssemblyArray(VM&, Structure*, Wasm::FieldType, size_t, FixedVector<uint32_t>&&, RefPtr<const Wasm::RTT>);
JSWebAssemblyArray(VM&, Structure*, Wasm::FieldType, size_t, FixedVector<uint64_t>&&, RefPtr<const Wasm::RTT>);
~JSWebAssemblyArray();
DECLARE_DEFAULT_FINISH_CREATION;
Wasm::FieldType m_elementType;
size_t m_size;
// A union is used here to ensure the underlying storage is aligned correctly.
// The payload member used entirely depends on m_elementType, so no tag is required.
union {
FixedVector<uint8_t> m_payload8;
FixedVector<uint16_t> m_payload16;
FixedVector<uint32_t> m_payload32;
FixedVector<uint64_t> m_payload64;
};
};
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
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