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/*
* Copyright (C) 2025 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 "WebAssemblyGCStructure.h"
#include "JSCInlines.h"
#include "WasmFormat.h"
#if ENABLE(WEBASSEMBLY)
namespace JSC {
static inline Wasm::TypeHash typeHash(const Wasm::TypeDefinition& typeDef)
{
return Wasm::TypeHash { const_cast<Wasm::TypeDefinition&>(typeDef) };
}
WebAssemblyGCStructureTypeDependencies::WebAssemblyGCStructureTypeDependencies(Ref<const Wasm::TypeDefinition>&& unexpandedType)
{
WorkList work;
SUPPRESS_UNCHECKED_ARG work.append(unexpandedType->expand());
while (!work.isEmpty())
SUPPRESS_UNCHECKED_ARG process(work.takeLast(), work);
m_typeDefinitions.add(typeHash(unexpandedType));
}
void WebAssemblyGCStructureTypeDependencies::process(const Wasm::TypeDefinition& typeDef, WorkList& work)
{
if (m_typeDefinitions.contains(typeHash(typeDef)))
return;
m_typeDefinitions.add(typeHash(typeDef));
if (typeDef.is<Wasm::StructType>()) {
SUPPRESS_UNCHECKED_LOCAL auto* structType = typeDef.as<Wasm::StructType>();
for (unsigned i = 0; i < structType->fieldCount(); ++i)
process(structType->field(i), work);
} else if (typeDef.is<Wasm::ArrayType>())
process(typeDef.as<Wasm::ArrayType>()->elementType(), work);
}
void WebAssemblyGCStructureTypeDependencies::process(Wasm::FieldType fieldType, WorkList& work)
{
if (fieldType.type.is<Wasm::Type>()) {
Wasm::Type type = fieldType.type.as<Wasm::Type>();
if (isRefWithTypeIndex(type)) {
SUPPRESS_UNCHECKED_LOCAL const auto& typeDef = Wasm::TypeInformation::get(type.index);
work.append(typeDef);
}
}
}
WebAssemblyGCStructure::WebAssemblyGCStructure(VM& vm, JSGlobalObject* globalObject, const TypeInfo& typeInfo, const ClassInfo* classInfo, Ref<const Wasm::TypeDefinition>&& unexpandedType, Ref<const Wasm::TypeDefinition>&& type, Ref<const Wasm::RTT>&& rtt)
: Structure(vm, StructureVariant::WebAssemblyGC, globalObject, typeInfo, classInfo)
, m_rtt(WTFMove(rtt))
, m_type(WTFMove(type))
, m_typeDependencies(WebAssemblyGCStructureTypeDependencies { WTFMove(unexpandedType) })
{
for (unsigned i = 0; i < std::min((m_rtt->displaySizeExcludingThis() + 1), inlinedTypeDisplaySize); ++i)
m_inlinedTypeDisplay[i] = m_rtt->displayEntry(i);
}
WebAssemblyGCStructure::WebAssemblyGCStructure(VM& vm, WebAssemblyGCStructure* previous)
: Structure(vm, StructureVariant::WebAssemblyGC, previous)
, m_rtt(previous->m_rtt)
, m_type(previous->m_type)
, m_inlinedTypeDisplay(previous->m_inlinedTypeDisplay)
, m_typeDependencies(previous->m_typeDependencies)
{
}
WebAssemblyGCStructure* WebAssemblyGCStructure::create(VM& vm, JSGlobalObject* globalObject, const TypeInfo& typeInfo, const ClassInfo* classInfo, Ref<const Wasm::TypeDefinition>&& unexpandedType, Ref<const Wasm::TypeDefinition>&& type, Ref<const Wasm::RTT>&& rtt)
{
ASSERT(vm.structureStructure);
WebAssemblyGCStructure* newStructure = new (NotNull, allocateCell<WebAssemblyGCStructure>(vm)) WebAssemblyGCStructure(vm, globalObject, typeInfo, classInfo, WTFMove(unexpandedType), WTFMove(type), WTFMove(rtt));
newStructure->finishCreation(vm);
ASSERT(newStructure->type() == StructureType);
return newStructure;
}
} // namespace JSC
#endif
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