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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "include/cppgc/trace-trait.h"
#include "src/heap/cppgc/gc-info-table.h"
#include "src/heap/cppgc/heap-page.h"
namespace cppgc {
namespace internal {
TraceDescriptor TraceTraitFromInnerAddressImpl::GetTraceDescriptor(
const void* address) {
// address is guaranteed to be on a normal page because this is used only for
// mixins.
const BasePage* page = BasePage::FromPayload(address);
page->SynchronizedLoad();
const HeapObjectHeader& header =
page->ObjectHeaderFromInnerAddress<AccessMode::kAtomic>(address);
return {header.ObjectStart(),
GlobalGCInfoTable::GCInfoFromIndex(
header.GetGCInfoIndex<AccessMode::kAtomic>())
.trace};
}
} // namespace internal
} // namespace cppgc
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