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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_