treemapFromJson function

Map<String, dynamic> treemapFromJson(Object inputJson, { TreemapFormat format = TreemapFormat.objectType, bool collapseSingleChildPathNodes = true, })

Convert the given AOT snapshot information file into a treemap object, represented as a Map. Each node of the tree has one of the two schemas.

Leaf symbol nodes:

{
  'k': kindSymbol,
  'n': /* name */,
  'lastPathElement': true,
  't': symbolTypeGlobalText | symbolTypeGlobalInitializedData,
  'value': /* symbol size */
}

Path nodes:

{
  'k': kindPath,
  'n': /* name */,
  'children': /* array of treemap nodes */
}

If inputJson represents a V8 snapshot profile then format allows to controls how individual v8_profile.Snapshot nodes are collapsed into leaf treemap nodes (see TreemapFormat for more details).

By default chains of single child path nodes are collapsed into a single path node, e.g. {k: 'p', n: 'a', children: [{k: 'p', n: 'b', children: [...]}]} becomes {k: 'p', n: 'a/b', children: [...]}. This behavior is controlled by collapseSingleChildPathNodes parameter and can be switched off by setting it to false.

Implementation

Map<String, dynamic> treemapFromJson(Object inputJson,
    {TreemapFormat format = TreemapFormat.objectType,
    bool collapseSingleChildPathNodes = true}) {
  final root = {'n': '', 'children': {}, 'k': kindPath, 'maxDepth': 0};

  if (v8_profile.Snapshot.isV8HeapSnapshot(inputJson)) {
    _treemapFromSnapshot(
        root, v8_profile.Snapshot.fromJson(inputJson as Map<String, dynamic>),
        format: format);
  } else {
    final symbols = instruction_sizes.fromJson(inputJson as List<dynamic>);
    for (var symbol in symbols) {
      _addSymbol(root, _treePath(symbol), symbol.name.scrubbed, symbol.size);
    }
  }
  return _flatten(root,
      collapseSingleChildPathNodes: collapseSingleChildPathNodes);
}