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| 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 |
| 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 |
| 13 Debug = debug.Debug; |
| 14 |
| 15 var expected_events = 2; |
| 16 var log = []; |
| 17 |
| 18 var p = new Promise(function(resolve, reject) { |
| 19 log.push("resolve"); |
| 20 resolve(); |
| 21 }); |
| 22 |
| 23 function 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 |
| 33 MyPromise.prototype = new Promise(function() {}); |
| 34 p.constructor = MyPromise; |
| 35 |
| 36 var q = p.chain( |
| 37 function() { |
| 38 log.push("throw caught"); |
| 39 throw new Error("caught"); // event |
| 40 }); |
| 41 |
| 42 function 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 assertEquals(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 |
| 64 Debug.setBreakOnUncaughtException(); |
| 65 Debug.setListener(listener); |
| 66 |
| 67 log.push("end main"); |
| 68 |
| 69 function 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 // Run testDone through the Object.observe processing loop. |
| 85 var dummy = {}; |
| 86 Object.observe(dummy, checkResult); |
| 87 dummy.dummy = dummy; |
| 88 } |
| 89 |
| 90 testDone(0); |
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