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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 "src/heap/cppgc/marking-visitor.h"
#include "src/heap/cppgc/globals.h"
#include "src/heap/cppgc/heap.h"
#include "src/heap/cppgc/marking-state.h"
namespace cppgc {
namespace internal {
MarkingVisitorBase::MarkingVisitorBase(HeapBase& heap,
BasicMarkingState& marking_state)
: marking_state_(marking_state) {}
void MarkingVisitorBase::Visit(const void* object, TraceDescriptor desc) {
marking_state_.MarkAndPush(object, desc);
}
void MarkingVisitorBase::VisitWeak(const void* object, TraceDescriptor desc,
WeakCallback weak_callback,
const void* weak_member) {
marking_state_.RegisterWeakReferenceIfNeeded(object, desc, weak_callback,
weak_member);
}
void MarkingVisitorBase::VisitEphemeron(const void* key, const void* value,
TraceDescriptor value_desc) {
marking_state_.ProcessEphemeron(key, value, value_desc, *this);
}
void MarkingVisitorBase::VisitWeakContainer(const void* object,
TraceDescriptor strong_desc,
TraceDescriptor weak_desc,
WeakCallback callback,
const void* data) {
marking_state_.ProcessWeakContainer(object, weak_desc, callback, data);
}
void MarkingVisitorBase::RegisterWeakCallback(WeakCallback callback,
const void* object) {
marking_state_.RegisterWeakCallback(callback, object);
}
void MarkingVisitorBase::HandleMovableReference(const void** slot) {
marking_state_.RegisterMovableReference(slot);
}
ConservativeMarkingVisitor::ConservativeMarkingVisitor(
HeapBase& heap, MutatorMarkingState& marking_state, cppgc::Visitor& visitor)
: ConservativeTracingVisitor(heap, *heap.page_backend(), visitor),
marking_state_(marking_state) {}
void ConservativeMarkingVisitor::VisitFullyConstructedConservatively(
HeapObjectHeader& header) {
if (header.IsMarked<AccessMode::kAtomic>()) {
if (marking_state_.IsMarkedWeakContainer(header))
marking_state_.ReTraceMarkedWeakContainer(visitor_, header);
return;
}
ConservativeTracingVisitor::VisitFullyConstructedConservatively(header);
}
void ConservativeMarkingVisitor::VisitInConstructionConservatively(
HeapObjectHeader& header, TraceConservativelyCallback callback) {
DCHECK(!marking_state_.IsMarkedWeakContainer(header));
// In construction objects found through conservative can be marked if they
// hold a reference to themselves.
if (!marking_state_.MarkNoPush(header)) return;
marking_state_.AccountMarkedBytes(header);
callback(this, header);
}
MutatorMarkingVisitor::MutatorMarkingVisitor(HeapBase& heap,
MutatorMarkingState& marking_state)
: MarkingVisitorBase(heap, marking_state) {}
void MutatorMarkingVisitor::VisitRoot(const void* object, TraceDescriptor desc,
const SourceLocation&) {
Visit(object, desc);
}
void MutatorMarkingVisitor::VisitWeakRoot(const void* object,
TraceDescriptor desc,
WeakCallback weak_callback,
const void* weak_root,
const SourceLocation&) {
static_cast<MutatorMarkingState&>(marking_state_)
.InvokeWeakRootsCallbackIfNeeded(object, desc, weak_callback, weak_root);
}
ConcurrentMarkingVisitor::ConcurrentMarkingVisitor(
HeapBase& heap, ConcurrentMarkingState& marking_state)
: MarkingVisitorBase(heap, marking_state) {}
void ConservativeMarkingVisitor::VisitPointer(const void* address) {
TraceConservativelyIfNeeded(address);
}
bool ConcurrentMarkingVisitor::DeferTraceToMutatorThreadIfConcurrent(
const void* parameter, TraceCallback callback, size_t deferred_size) {
marking_state_.concurrent_marking_bailout_worklist().Push(
{parameter, callback, deferred_size});
static_cast<ConcurrentMarkingState&>(marking_state_)
.AccountDeferredMarkedBytes(deferred_size);
return true;
}
} // namespace internal
} // namespace cppgc
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