upgrade node and swig

linx64/include/node/v8-embedder-heap.h

@@ -0,0 +1,82 @@
+// 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_