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// Copyright 2021 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 INCLUDE_V8_EMBEDDER_HEAP_H_
#define INCLUDE_V8_EMBEDDER_HEAP_H_
#include "v8-traced-handle.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
class Isolate;
class Value;
/**
* Handler for embedder roots on non-unified heap garbage collections.
*/
class V8_EXPORT EmbedderRootsHandler {
public:
virtual ~EmbedderRootsHandler() = default;
/**
* Returns true if the |TracedReference| handle should be considered as root
* for the currently running non-tracing garbage collection and false
* otherwise. The default implementation will keep all |TracedReference|
* references as roots.
*
* If this returns false, then V8 may decide that the object referred to by
* such a handle is reclaimed. In that case, V8 calls |ResetRoot()| for the
* |TracedReference|.
*
* Note that the `handle` is different from the handle that the embedder holds
* for retaining the object. The embedder may use |WrapperClassId()| to
* distinguish cases where it wants handles to be treated as roots from not
* being treated as roots.
*/
virtual bool IsRoot(const v8::TracedReference<v8::Value>& handle) = 0;
/**
* Used in combination with |IsRoot|. Called by V8 when an
* object that is backed by a handle is reclaimed by a non-tracing garbage
* collection. It is up to the embedder to reset the original handle.
*
* Note that the |handle| is different from the handle that the embedder holds
* for retaining the object. It is up to the embedder to find the original
* handle via the object or class id.
*/
virtual void ResetRoot(const v8::TracedReference<v8::Value>& handle) = 0;
};
} // namespace v8
#endif // INCLUDE_V8_EMBEDDER_HEAP_H_