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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 {
namespace internal {
class TracedHandles;
} // namespace internal
class Isolate;
class Value;
/**
* Handler for embedder roots on non-unified heap garbage collections.
*/
class V8_EXPORT EmbedderRootsHandler {
public:
enum class RootHandling {
kQueryEmbedderForNonDroppableReferences,
kDontQueryEmbedderForAnyReference,
};
virtual ~EmbedderRootsHandler() = default;
EmbedderRootsHandler() = default;
explicit EmbedderRootsHandler(RootHandling default_traced_reference_handling)
: default_traced_reference_handling_(default_traced_reference_handling) {}
/**
* 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 concrete implementations must be thread-safe.
*/
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;
/**
* Similar to |ResetRoot()|, but opportunistic. The function is called in
* parallel for different handles and as such must be thread-safe. In case,
* |false| is returned, |ResetRoot()| will be recalled for the same handle.
*/
virtual bool TryResetRoot(const v8::TracedReference<v8::Value>& handle) {
ResetRoot(handle);
return true;
}
private:
const RootHandling default_traced_reference_handling_ =
RootHandling::kQueryEmbedderForNonDroppableReferences;
friend class internal::TracedHandles;
};
} // namespace v8
#endif // INCLUDE_V8_EMBEDDER_HEAP_H_
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| cppgc | Folder | 0755 |
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| libplatform | Folder | 0755 |
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| openssl | Folder | 0755 |
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| uv | Folder | 0755 |
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| common.gypi | File | 26.59 KB | 0644 |
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| config.gypi | File | 32.08 KB | 0644 |
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| js_native_api.h | File | 31.64 KB | 0644 |
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| js_native_api_types.h | File | 6.87 KB | 0644 |
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| node.h | File | 67.99 KB | 0644 |
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| node_api.h | File | 10.34 KB | 0644 |
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| node_api_types.h | File | 1.57 KB | 0644 |
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| node_buffer.h | File | 3.6 KB | 0644 |
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| node_object_wrap.h | File | 3.78 KB | 0644 |
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| node_version.h | File | 4.14 KB | 0644 |
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| uv.h | File | 71.1 KB | 0644 |
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| v8-array-buffer.h | File | 17.89 KB | 0644 |
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| v8-callbacks.h | File | 16.59 KB | 0644 |
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| v8-container.h | File | 5.82 KB | 0644 |
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| v8-context.h | File | 17.76 KB | 0644 |
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| v8-cppgc.h | File | 7.46 KB | 0644 |
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| v8-data.h | File | 1.58 KB | 0644 |
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| v8-date.h | File | 1.19 KB | 0644 |
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| v8-debug.h | File | 5.04 KB | 0644 |
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| v8-embedder-heap.h | File | 2.71 KB | 0644 |
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| v8-embedder-state-scope.h | File | 1.46 KB | 0644 |
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| v8-exception.h | File | 7.41 KB | 0644 |
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| v8-extension.h | File | 1.83 KB | 0644 |
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| v8-external.h | File | 924 B | 0644 |
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| v8-function-callback.h | File | 19.19 KB | 0644 |
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| v8-function.h | File | 4.42 KB | 0644 |
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| v8-handle-base.h | File | 4.3 KB | 0644 |
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| v8-initialization.h | File | 10.23 KB | 0644 |
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| v8-internal.h | File | 57.22 KB | 0644 |
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| v8-isolate.h | File | 63.38 KB | 0644 |
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| v8-json.h | File | 1.32 KB | 0644 |
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| v8-local-handle.h | File | 23.6 KB | 0644 |
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| v8-locker.h | File | 3.86 KB | 0644 |
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| v8-maybe.h | File | 4.47 KB | 0644 |
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| v8-memory-span.h | File | 6.27 KB | 0644 |
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| v8-message.h | File | 7.24 KB | 0644 |
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| v8-microtask-queue.h | File | 4.95 KB | 0644 |
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| v8-microtask.h | File | 861 B | 0644 |
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| v8-object.h | File | 29.55 KB | 0644 |
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| v8-persistent-handle.h | File | 17.81 KB | 0644 |
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| v8-platform.h | File | 47.9 KB | 0644 |
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| v8-primitive-object.h | File | 2.53 KB | 0644 |
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| v8-primitive.h | File | 27.69 KB | 0644 |
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| v8-profiler.h | File | 41.11 KB | 0644 |
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| v8-proxy.h | File | 1.23 KB | 0644 |
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| v8-regexp.h | File | 3.1 KB | 0644 |
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| v8-script.h | File | 30.59 KB | 0644 |
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| v8-snapshot.h | File | 10.15 KB | 0644 |
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| v8-source-location.h | File | 2.54 KB | 0644 |
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| v8-statistics.h | File | 7.45 KB | 0644 |
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| v8-template.h | File | 50.36 KB | 0644 |
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| v8-traced-handle.h | File | 12.4 KB | 0644 |
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| v8-typed-array.h | File | 11.3 KB | 0644 |
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| v8-unwinder.h | File | 4.64 KB | 0644 |
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| v8-value-serializer.h | File | 10.56 KB | 0644 |
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| v8-value.h | File | 16.71 KB | 0644 |
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| v8-version.h | File | 773 B | 0644 |
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| v8-wasm.h | File | 6 KB | 0644 |
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| v8-weak-callback-info.h | File | 2.41 KB | 0644 |
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| v8.h | File | 3.69 KB | 0644 |
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| v8config.h | File | 32.85 KB | 0644 |
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| zconf.h | File | 16.6 KB | 0644 |
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| zlib.h | File | 95.17 KB | 0644 |
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