Function addOrUpdateChildNode

deps/v8/tools/profview/profile-utils.js:160–185

(parent, file, stackIndex, stackPos, ascending)

}

function addOrUpdateChildNode(parent, file, stackIndex, stackPos, ascending) {
  if (stackPos === -1) {
    // We reached the end without finding the next step.
    // If we are doing top-down call tree, update own ticks.
    if (!ascending) {
      parent.ownTicks++;
    }
    return;
  }

  let stack = file.ticks[stackIndex].s;
  console.assert(stackPos >= 0 && stackPos < stack.length);
  let codeId = stack[stackPos];
  let code = codeId >= 0 ? file.code[codeId] : undefined;
  // We found a child node.
  let childId = childIdFromCode(codeId, code);
  let child = parent.children[childId];
  if (!child) {
    let vmState = file.ticks[stackIndex].vm;
    child = createNodeFromStackEntry(code, codeId, vmState);
    child.delayedExpansion = { frameList : [], ascending };
    parent.children[childId] = child;
  }
  child.ticks++;
  addFrameToFrameList(child.delayedExpansion.frameList, stackIndex, stackPos);
}

// This expands a tree node (direct children only).
function expandTreeNode(file, node, filter) {