Split nodes and edges into separate arrays in heap snapshot serialization.

include/v8-profiler.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
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    * Prepare a serialized representation of the snapshot. The result
    * is written into the stream provided in chunks of specified size.
    * The total length of the serialized snapshot is unknown in
    * advance, it can be roughly equal to JS heap size (that means,
    * it can be really big - tens of megabytes).
    *
    * For the JSON format, heap contents are represented as an object
    * with the following structure:
    *
    *  {
-   *    snapshot: {title: "...", uid: nnn},
-   *    nodes: [
-   *      meta-info (JSON string),
-   *      nodes themselves
-   *    ],
-   *    strings: [strings]
+   *    snapshot: {
+   *      title: "...",
+   *      uid: nnn,
+   *      meta: { meta-info },
+   *      node_count: nnn,
+   *      edge_count: nnn
+   *    },
+   *    nodes: [nodes array],
+   *    edges: [edges array],
+   *    strings: [strings array]
    *  }
    *
-   * Outgoing node links are stored after each node. Nodes reference strings
-   * and other nodes by their indexes in corresponding arrays.
+   * Nodes reference strings, other nodes, and edges by their indexes
+   * in corresponding arrays.
    */
   void Serialize(OutputStream* stream, SerializationFormat format) const;
 };
 
 
 class RetainedObjectInfo;
 
 /**
  * Interface for controlling heap profiling.
  */
@@ skipping 123 matching lines @@
 };
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 
 
 #endif  // V8_V8_PROFILER_H_