| // Copyright 2016 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. |
| |
| // Flags: --expose-debug-as debug --harmony-tailcalls |
| |
| "use strict"; |
| |
| var Debug = debug.Debug |
| var exception = null; |
| var breaks = 0; |
| |
| function f(x) { |
| if (x > 0) { |
| return f(x - 1); // Tail call |
| } |
| debugger; // Break 0 |
| } |
| |
| function g(x) { |
| return f(x); // Tail call |
| } |
| |
| function h(x) { |
| g(x); // Not tail call |
| } // Break 1 |
| |
| |
| function listener(event, exec_state, event_data, data) { |
| if (event != Debug.DebugEvent.Break) return; |
| try { |
| assertTrue(event_data.sourceLineText().indexOf(`Break ${breaks++}`) > 0); |
| exec_state.prepareStep(Debug.StepAction.StepOut); |
| } catch (e) { |
| exception = e; |
| }; |
| }; |
| |
| Debug.setListener(listener); |
| |
| h(3); |
| |
| Debug.setListener(null); // Break 2 |
| assertNull(exception); |
| assertEquals(3, breaks); |