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/*
* Copyright (C) 2022-2023 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.
*/
#include "config.h"
#include "JSWebAssemblyStruct.h"
#if ENABLE(WEBASSEMBLY)
#include "JSCInlines.h"
#include "JSWebAssemblyInstance.h"
#include "WasmFormat.h"
#include "WasmModuleInformation.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
const ClassInfo JSWebAssemblyStruct::s_info = { "WebAssembly.Struct"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyStruct) };
Structure* JSWebAssemblyStruct::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(WebAssemblyGCObjectType, StructureFlags), info());
}
JSWebAssemblyStruct::JSWebAssemblyStruct(VM& vm, Structure* structure, Ref<const Wasm::TypeDefinition>&& type, RefPtr<const Wasm::RTT>&& rtt)
: Base(vm, structure, WTFMove(rtt))
, m_type(WTFMove(type))
, m_payload(structType()->instancePayloadSize(), 0)
{
}
JSWebAssemblyStruct* JSWebAssemblyStruct::create(VM& vm, Structure* structure, JSWebAssemblyInstance* instance, uint32_t typeIndex, RefPtr<const Wasm::RTT>&& rtt)
{
Ref type = instance->module().moduleInformation().typeSignatures[typeIndex]->expand();
auto* structValue = new (NotNull, allocateCell<JSWebAssemblyStruct>(vm)) JSWebAssemblyStruct(vm, structure, WTFMove(type), WTFMove(rtt));
structValue->finishCreation(vm);
return structValue;
}
const uint8_t* JSWebAssemblyStruct::fieldPointer(uint32_t fieldIndex) const
{
return m_payload.span().data() + structType()->offsetOfFieldInternal(fieldIndex);
}
uint8_t* JSWebAssemblyStruct::fieldPointer(uint32_t fieldIndex)
{
return const_cast<uint8_t*>(const_cast<const JSWebAssemblyStruct*>(this)->fieldPointer(fieldIndex));
}
uint64_t JSWebAssemblyStruct::get(uint32_t fieldIndex) const
{
using Wasm::TypeKind;
const uint8_t* targetPointer = fieldPointer(fieldIndex);
if (fieldType(fieldIndex).type.is<Wasm::PackedType>()) {
switch (fieldType(fieldIndex).type.as<Wasm::PackedType>()) {
case Wasm::PackedType::I8:
return *std::bit_cast<uint8_t*>(targetPointer);
case Wasm::PackedType::I16:
return *std::bit_cast<uint16_t*>(targetPointer);
}
}
ASSERT(fieldType(fieldIndex).type.is<Wasm::Type>());
switch (fieldType(fieldIndex).type.as<Wasm::Type>().kind) {
case TypeKind::I32:
case TypeKind::F32:
return *std::bit_cast<uint32_t*>(targetPointer);
case TypeKind::I64:
case TypeKind::F64:
return *std::bit_cast<const uint64_t*>(targetPointer);
case TypeKind::Exn:
case TypeKind::Externref:
case TypeKind::Funcref:
case TypeKind::Ref:
case TypeKind::RefNull:
return JSValue::encode(std::bit_cast<WriteBarrierBase<Unknown>*>(targetPointer)->get());
case TypeKind::V128:
// V128 is not supported in LLInt.
default:
ASSERT_NOT_REACHED();
return 0;
}
}
void JSWebAssemblyStruct::set(uint32_t fieldIndex, uint64_t argument)
{
using Wasm::TypeKind;
uint8_t* targetPointer = fieldPointer(fieldIndex);
if (fieldType(fieldIndex).type.is<Wasm::PackedType>()) {
switch (fieldType(fieldIndex).type.as<Wasm::PackedType>()) {
case Wasm::PackedType::I8:
*std::bit_cast<uint8_t*>(targetPointer) = static_cast<uint8_t>(argument);
return;
case Wasm::PackedType::I16:
*std::bit_cast<uint16_t*>(targetPointer) = static_cast<uint16_t>(argument);
return;
}
}
ASSERT(fieldType(fieldIndex).type.is<Wasm::Type>());
switch (fieldType(fieldIndex).type.as<Wasm::Type>().kind) {
case TypeKind::I32:
case TypeKind::F32: {
*std::bit_cast<uint32_t*>(targetPointer) = static_cast<uint32_t>(argument);
return;
}
case TypeKind::I64:
case TypeKind::F64: {
*std::bit_cast<uint64_t*>(targetPointer) = argument;
return;
}
case TypeKind::Arrayref:
case TypeKind::Structref:
case TypeKind::Externref:
case TypeKind::Funcref:
case TypeKind::Ref:
case TypeKind::RefNull: {
std::bit_cast<WriteBarrierBase<Unknown>*>(targetPointer)->set(vm(), this, JSValue::decode(static_cast<EncodedJSValue>(argument)));
return;
}
case TypeKind::V128:
case TypeKind::Func:
case TypeKind::Struct:
case TypeKind::Array:
case TypeKind::Void:
case TypeKind::Sub:
case TypeKind::Subfinal:
case TypeKind::Rec:
case TypeKind::Exn:
case TypeKind::Eqref:
case TypeKind::Anyref:
case TypeKind::Nullexn:
case TypeKind::Nullref:
case TypeKind::Nullfuncref:
case TypeKind::Nullexternref:
case TypeKind::I31ref: {
break;
}
}
ASSERT_NOT_REACHED();
}
void JSWebAssemblyStruct::set(uint32_t fieldIndex, v128_t argument)
{
uint8_t* targetPointer = fieldPointer(fieldIndex);
ASSERT(fieldType(fieldIndex).type.is<Wasm::Type>());
ASSERT(fieldType(fieldIndex).type.as<Wasm::Type>().kind == Wasm::TypeKind::V128);
*std::bit_cast<v128_t*>(targetPointer) = argument;
}
template<typename Visitor>
void JSWebAssemblyStruct::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
Base::visitChildren(cell, visitor);
auto* wasmStruct = jsCast<JSWebAssemblyStruct*>(cell);
for (unsigned i = 0; i < wasmStruct->structType()->fieldCount(); ++i) {
if (isRefType(wasmStruct->fieldType(i).type))
visitor.append(*std::bit_cast<WriteBarrier<Unknown>*>(wasmStruct->fieldPointer(i)));
}
}
DEFINE_VISIT_CHILDREN(JSWebAssemblyStruct);
void JSWebAssemblyStruct::destroy(JSCell* cell)
{
static_cast<JSWebAssemblyStruct*>(cell)->JSWebAssemblyStruct::~JSWebAssemblyStruct();
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY)
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