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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 "WasmFormat.h"
#include "WasmOps.h"
#include "WasmTypeDefinition.h"
#include "WebAssemblyGCObjectBase.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
class JSWebAssemblyArray final : public WebAssemblyGCObjectBase {
friend class LLIntOffsetsExtractor;
public:
using Base = WebAssemblyGCObjectBase;
static constexpr DestructionMode needsDestruction = NeedsDestruction;
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&, JSGlobalObject*, JSValue);
static JSWebAssemblyArray* tryCreate(VM& vm, Structure* structure, Wasm::FieldType elementType, size_t size, RefPtr<const Wasm::RTT>&& rtt)
{
// We have no good way to test for a failed allocation in FixedVector, so we open-code the test here.
if (is32Bit() && WTF::sumOverflows<uint32_t>(EmbeddedFixedVector<v128_t>::offsetOfData(), elementType.type.elementSize() * size))
return nullptr;
auto* object = new (NotNull, allocateCell<JSWebAssemblyArray>(vm)) JSWebAssemblyArray(vm, structure, elementType, size, WTFMove(rtt));
object->finishCreation(vm);
return object;
}
DECLARE_VISIT_CHILDREN;
Wasm::FieldType elementType() const { return m_elementType; }
size_t size() const { return m_size; }
uint8_t* data()
{
if (m_elementType.type.is<Wasm::PackedType>()) {
switch (m_elementType.type.as<Wasm::PackedType>()) {
case Wasm::PackedType::I8:
return m_payload8.mutableSpan().data();
case Wasm::PackedType::I16:
return reinterpret_cast<uint8_t*>(m_payload16.mutableSpan().data());
}
}
ASSERT(m_elementType.type.is<Wasm::Type>());
switch (m_elementType.type.as<Wasm::Type>().kind) {
case Wasm::TypeKind::I32:
case Wasm::TypeKind::F32:
return reinterpret_cast<uint8_t*>(m_payload32.mutableSpan().data());
case Wasm::TypeKind::V128:
return reinterpret_cast<uint8_t*>(m_payload128.mutableSpan().data());
default:
return reinterpret_cast<uint8_t*>(m_payload64.mutableSpan().data());
}
ASSERT_NOT_REACHED();
return nullptr;
};
bool elementsAreRefTypes() const
{
return Wasm::isRefType(m_elementType.type.unpacked());
}
uint64_t* reftypeData()
{
RELEASE_ASSERT(elementsAreRefTypes());
return m_payload64.mutableSpan().data();
}
uint64_t 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<uint64_t>(m_payload8[index]);
case Wasm::PackedType::I16:
return static_cast<uint64_t>(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<uint64_t>(m_payload32[index]);
case Wasm::TypeKind::V128:
// V128 is not supported in LLInt.
RELEASE_ASSERT_NOT_REACHED();
default:
return static_cast<uint64_t>(m_payload64[index]);
}
}
void set(uint32_t index, uint64_t value)
{
if (m_elementType.type.is<Wasm::PackedType>()) {
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 = std::bit_cast<WriteBarrier<Unknown>*>(m_payload64.mutableSpan().data());
pointer += index;
pointer->set(vm(), this, JSValue::decode(static_cast<EncodedJSValue>(value)));
break;
}
case Wasm::TypeKind::V128:
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void set(uint32_t index, v128_t value)
{
ASSERT(m_elementType.type.is<Wasm::Type>());
ASSERT(m_elementType.type.as<Wasm::Type>().kind == Wasm::TypeKind::V128);
m_payload128[index] = value;
}
void fill(uint32_t, uint64_t, uint32_t);
void fill(uint32_t, v128_t, uint32_t);
void copy(JSWebAssemblyArray&, uint32_t, uint32_t, uint32_t);
static constexpr ptrdiff_t offsetOfSize() { return OBJECT_OFFSETOF(JSWebAssemblyArray, m_size); }
static constexpr ptrdiff_t offsetOfPayload() { return OBJECT_OFFSETOF(JSWebAssemblyArray, m_payload8) + FixedVector<uint8_t>::offsetOfStorage(); }
static ptrdiff_t offsetOfElements(Wasm::StorageType type)
{
if (type.is<Wasm::PackedType>()) {
switch (type.as<Wasm::PackedType>()) {
case Wasm::PackedType::I8:
return FixedVector<uint8_t>::Storage::offsetOfData();
case Wasm::PackedType::I16:
return FixedVector<uint16_t>::Storage::offsetOfData();
}
}
ASSERT(type.is<Wasm::Type>());
switch (type.as<Wasm::Type>().kind) {
case Wasm::TypeKind::I32:
case Wasm::TypeKind::F32:
return FixedVector<uint32_t>::Storage::offsetOfData();
case Wasm::TypeKind::I64:
case Wasm::TypeKind::F64:
case Wasm::TypeKind::Ref:
case Wasm::TypeKind::RefNull:
return FixedVector<uint64_t>::Storage::offsetOfData();
case Wasm::TypeKind::V128:
return FixedVector<v128_t>::Storage::offsetOfData();
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
return 0;
}
protected:
JSWebAssemblyArray(VM&, Structure*, Wasm::FieldType, size_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 {
void* zeroInit { nullptr };
FixedVector<uint8_t> m_payload8;
FixedVector<uint16_t> m_payload16;
FixedVector<uint32_t> m_payload32;
FixedVector<uint64_t> m_payload64;
FixedVector<v128_t> m_payload128;
};
};
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY)
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