evalInFrame.js - mozsearch

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var evalInFrame = (function (global) {

  var dbgGlobal = newGlobal({newCompartment: true});

  var dbg = new dbgGlobal.Debugger();

  return function evalInFrame(upCount, code) {

    dbg.addDebuggee(global);

    // Skip ourself.

    var frame = dbg.getNewestFrame().older;

    for (var i = 0; i < upCount; i++) {

      if (!frame.older)

        break;

      frame = frame.older;

    var completion = frame.eval(code);

    if (completion.return) {

      var v = completion.return;

      if (typeof v === "object")

        v = v.unsafeDereference();

      return v;

    if (completion.throw) {

      var v = completion.throw;

      if (typeof v === "object")

        v = v.unsafeDereference();

      throw v;

    if (completion === null)

      terminate();

};

})(this);