1// Copyright 2014 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// Flags: --expose-debug-as debug --allow-natives-syntax --promise-extra
6
7// Test debug events when an exception is thrown inside a Promise, which is
8// caught by a custom promise, which throws a new exception in its reject
9// handler. We expect two Exception debug events:
10//  1) when the exception is thrown in the promise q.
11//  2) when the custom reject closure in MyPromise throws an exception.
12
13Debug = debug.Debug;
14
15var expected_events = 2;
16var log = [];
17
18var p = new Promise(function(resolve, reject) {
19  log.push("resolve");
20  resolve();
21});
22
23function MyPromise(resolver) {
24  var reject = function() {
25    log.push("throw in reject");
26    throw new Error("reject");  // event
27  };
28  var resolve = function() { };
29  log.push("construct");
30  resolver(resolve, reject);
31};
32
33MyPromise.prototype = new Promise(function() {});
34p.constructor = MyPromise;
35
36var q = p.chain(
37  function() {
38    log.push("throw caught");
39    throw new Error("caught");  // event
40  });
41
42function listener(event, exec_state, event_data, data) {
43  try {
44    if (event == Debug.DebugEvent.Exception) {
45      expected_events--;
46      assertTrue(expected_events >= 0);
47      if (expected_events == 1) {
48        assertEquals(["resolve", "construct", "end main",
49                      "throw caught"], log);
50        assertEquals("caught", event_data.exception().message);
51      } else if (expected_events == 0) {
52        assertEquals("reject", event_data.exception().message);
53      } else {
54        assertUnreachable();
55      }
56      assertSame(q, event_data.promise());
57      assertTrue(exec_state.frame(0).sourceLineText().indexOf('// event') > 0);
58    }
59  } catch (e) {
60    %AbortJS(e + "\n" + e.stack);
61  }
62}
63
64Debug.setBreakOnUncaughtException();
65Debug.setListener(listener);
66
67log.push("end main");
68
69function testDone(iteration) {
70  function checkResult() {
71    try {
72      assertTrue(iteration < 10);
73      if (expected_events === 0) {
74        assertEquals(["resolve", "construct", "end main",
75                      "throw caught", "throw in reject"], log);
76      } else {
77        testDone(iteration + 1);
78      }
79    } catch (e) {
80      %AbortJS(e + "\n" + e.stack);
81    }
82  }
83
84  %EnqueueMicrotask(checkResult);
85}
86
87testDone(0);
88