// Copyright 2015 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. Debug = debug.Debug var exception = null; var break_count = 0; function listener(event, exec_state, event_data, data) { if (event != Debug.DebugEvent.Break) return; try { print(event_data.sourceLineText()); assertTrue(event_data.sourceLineText().indexOf(`Break ${break_count++}.`) > 0); exec_state.prepareStep(Debug.StepAction.StepInto); } catch (e) { exception = e; } }; function valueOfCallback() { return 2 // Break 2. ; // Break 3. } var o = {}; o.valueOf = valueOfCallback; Debug.setListener(listener); debugger; // Break 0. var result = 1 + o; // Break 1. Debug.setListener(null); // Break 4. assertEquals(3, result); assertNull(exception);