memory.mozcmd

[{
  name: "memory",
  description: "Get a memory report for the current page",
  exec: function(args, context) {
    Components.utils.import("resource://gre/modules/DownloadUtils.jsm");

    let output = '<h1>Memory report:</h1><br/><table>';
    let total = 0;

    let url = context.environment.contentDocument.location.href;
    url = url.replace(/\//g, "\\");
    let pathPrefix = "explicit/js/compartment(" + url + ")";

    let memMgr = Components.classes["@mozilla.org/memory-reporter-manager;1"]
                           .getService(Components.interfaces.nsIMemoryReporterManager);
    let reporters = memMgr.enumerateMultiReporters();
    while (reporters.hasMoreElements()) {
      let reporter = reporters.getNext().QueryInterface(Components.interfaces.nsIMemoryMultiReporter);
      reporter.collectReports(function(process, path, kind, units, amount, description, closure) {
        if (path.indexOf(pathPrefix) != 0)
          return;
        if (units != Components.interfaces.nsIMemoryReporter.UNITS_BYTES)
          return;

        total += amount;

        let pathDetail = path.slice(pathPrefix.length + 1);
        let [formattedSize, formattedUnit] = DownloadUtils.convertByteUnits(amount);

        output += '<tr><td><abbr title="' + description + '">' + pathDetail + '</abbr></td><td>' + formattedSize + ' ' + formattedUnit + '</td></tr>';
      }, reporter);
    }

    if (total == 0)
      return "Page not found in memory?!";

    let [formattedSize, formattedUnit] = DownloadUtils.convertByteUnits(total);
    output += '<tr><td><b>Total</b></td><td><b>' + formattedSize + ' ' + formattedUnit + '</b></td></tr>';

    output += "</table>"
    return output;
  }
}]