Function expandTreeNode

deps/v8/tools/profview/profile-utils.js:188–207

(file, node, filter)

// This expands a tree node (direct children only).
function expandTreeNode(file, node, filter) {
  let { frameList, ascending } = node.delayedExpansion;

  let step = ascending ? 2 : -2;

  for (let i = 0; i < frameList.length; i+= 3) {
    let firstStackIndex = frameList[i];
    let depth = frameList[i + 1];
    let count = frameList[i + 2];
    for (let j = 0; j < count; j++) {
      let stackIndex = firstStackIndex + j;
      let stack = file.ticks[stackIndex].s;

      // Get to the next frame that has not been filtered out.
      let stackPos = findNextFrame(file, stack, depth + step, step, filter);
      addOrUpdateChildNode(node, file, stackIndex, stackPos, ascending);
    }
  }
  node.delayedExpansion = null;
}

function createEmptyNode(name) {
  return {