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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.
#ifndef V8_HEAP_CPPGC_VISITOR_H_
#define V8_HEAP_CPPGC_VISITOR_H_
#include "include/cppgc/visitor.h"
#include "src/heap/cppgc/heap-object-header.h"
namespace cppgc {
namespace internal {
class HeapBase;
class HeapObjectHeader;
class PageBackend;
class VisitorFactory final {
public:
static constexpr Visitor::Key CreateKey() { return {}; }
};
// Base visitor that is allowed to create a public cppgc::Visitor object and
// use its internals.
class VisitorBase : public cppgc::Visitor {
public:
template <typename T>
static void TraceRawForTesting(cppgc::Visitor* visitor, const T* t) {
visitor->TraceImpl(t);
}
VisitorBase() : cppgc::Visitor(VisitorFactory::CreateKey()) {}
~VisitorBase() override = default;
VisitorBase(const VisitorBase&) = delete;
VisitorBase& operator=(const VisitorBase&) = delete;
};
class RootVisitorBase : public RootVisitor {
public:
RootVisitorBase() : RootVisitor(VisitorFactory::CreateKey()) {}
~RootVisitorBase() override = default;
RootVisitorBase(const RootVisitorBase&) = delete;
RootVisitorBase& operator=(const RootVisitorBase&) = delete;
};
// Regular visitor that additionally allows for conservative tracing.
class V8_EXPORT_PRIVATE ConservativeTracingVisitor {
public:
ConservativeTracingVisitor(HeapBase&, PageBackend&, cppgc::Visitor&);
virtual ~ConservativeTracingVisitor() = default;
ConservativeTracingVisitor(const ConservativeTracingVisitor&) = delete;
ConservativeTracingVisitor& operator=(const ConservativeTracingVisitor&) =
delete;
virtual void TraceConservativelyIfNeeded(const void*);
void TraceConservativelyIfNeeded(HeapObjectHeader&);
void TraceConservatively(const HeapObjectHeader&);
protected:
using TraceConservativelyCallback = void(ConservativeTracingVisitor*,
const HeapObjectHeader&);
virtual void VisitFullyConstructedConservatively(HeapObjectHeader&);
virtual void VisitInConstructionConservatively(HeapObjectHeader&,
TraceConservativelyCallback) {}
void TryTracePointerConservatively(Address address);
HeapBase& heap_;
PageBackend& page_backend_;
cppgc::Visitor& visitor_;
};
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_VISITOR_H_
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