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WebAssemblyGCStructure.cpp
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104 lines (92 loc) · 4.16 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 {
WebAssemblyGCStructure::WebAssemblyGCStructure(VM& vm, const TypeInfo& typeInfo, const ClassInfo* classInfo, Ref<const Wasm::RTT>&& rtt)
: Structure(vm, StructureVariant::WebAssemblyGC, nullptr, typeInfo, classInfo)
, m_rtt(WTF::move(rtt))
{
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::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(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 = uncheckedDowncast<WebAssemblyGCStructure>(uncheckedDowncast<Structure>(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