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WebAssemblyGCStructure.cpp
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144 lines (128 loc) · 5.92 KB
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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 "AbstractSlotVisitorInlines.h"
#include "DeferGC.h"
#include "JSCInlines.h"
#include "JSWebAssemblyArray.h"
#include "JSWebAssemblyStruct.h"
#include "SlotVisitorInlines.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, 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, nullptr, typeInfo, classInfo)
, m_rtt(WTF::move(rtt))
, m_type(WTF::move(type))
, m_typeDependencies(WebAssemblyGCStructureTypeDependencies { WTF::move(unexpandedType) })
{
setMayBePrototype(true); // Make sure that didPrototype transition does not happen.
switch (m_rtt->kind()) {
case Wasm::RTTKind::Function:
RELEASE_ASSERT_NOT_REACHED();
break;
case Wasm::RTTKind::Array:
ASSERT(classInfo->isSubClassOf(JSWebAssemblyArray::info()));
break;
case Wasm::RTTKind::Struct:
ASSERT(classInfo->isSubClassOf(JSWebAssemblyStruct::info()));
break;
}
}
WebAssemblyGCStructure* WebAssemblyGCStructure::create(VM& vm, const TypeInfo& typeInfo, const ClassInfo* classInfo, Ref<const Wasm::TypeDefinition>&& unexpandedType, Ref<const Wasm::TypeDefinition>&& type, Ref<const Wasm::RTT>&& rtt)
{
ASSERT(vm.structureStructure);
const Wasm::RTT* rttPtr = rtt.ptr();
DeferGC deferGC(vm);
return vm.wasmGCStructureMap.ensureValue(rttPtr, [&] {
WebAssemblyGCStructure* newStructure = new (NotNull, allocateCell<WebAssemblyGCStructure>(vm)) WebAssemblyGCStructure(vm, typeInfo, classInfo, WTF::move(unexpandedType), WTF::move(type), WTF::move(rtt));
newStructure->finishCreation(vm);
ASSERT(newStructure->type() == StructureType);
return newStructure;
});
}
void WebAssemblyGCStructure::finishCreation(VM& vm)
{
Structure::finishCreation(vm);
// The RTT display stores ancestors at indices 0..displaySize-1 and |this| at index displaySize.
// Mirror that layout in the inlined type display with StructureIDs.
unsigned displaySize = m_rtt->displaySizeExcludingThis();
unsigned actualDisplaySize = displaySize + 1; // +1 for |this|
unsigned count = std::min(actualDisplaySize, inlinedDisplaySize);
for (unsigned i = 0; i < count; ++i) {
RefPtr entryRTT = m_rtt->displayEntry(i);
auto* structure = this;
if (entryRTT != m_rtt.ptr())
structure = vm.wasmGCStructureMap.get(entryRTT);
RELEASE_ASSERT(structure);
m_inlinedDisplay[i].set(vm, this, structure);
}
}
template<typename Visitor>
void WebAssemblyGCStructure::visitAdditionalChildren(JSCell* cell, Visitor& visitor)
{
WebAssemblyGCStructure* thisObject = jsCast<WebAssemblyGCStructure*>(cell);
for (auto& slot : thisObject->m_inlinedDisplay)
visitor.append(slot);
}
template void WebAssemblyGCStructure::visitAdditionalChildren(JSCell*, AbstractSlotVisitor&);
template void WebAssemblyGCStructure::visitAdditionalChildren(JSCell*, SlotVisitor&);
} // namespace JSC
#endif