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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 a Promise is rejected, which is caught by a | |
| 8 // custom promise, which throws a new exception in its reject handler. | |
| 9 // We expect two Exception debug events: | |
| 10 // 1) when promise q is rejected. | |
| 11 // 2) when the custom reject closure in MyPromise throws an exception. | |
| 12 | |
| 13 Debug = debug.Debug; | |
| 14 | |
| 15 var expected_events = 1; | |
| 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.then( | |
| 37 function() { | |
| 38 log.push("reject caught"); | |
| 39 return Promise.reject(new Error("caught")); | |
| 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 assertEquals("reject", event_data.exception().message); | |
| 48 // Assert that the debug event is triggered at the throw site. | |
| 49 assertTrue( | |
| 50 exec_state.frame(0).sourceLineText().indexOf("// event") > 0); | |
| 51 } | |
| 52 } catch (e) { | |
| 53 // Signal a failure with exit code 1. This is necessary since the | |
| 54 // debugger swallows exceptions and we expect the chained function | |
| 55 // and this listener to be executed after the main script is finished. | |
| 56 print("Unexpected exception: " + e + "\n" + e.stack); | |
| 57 quit(1); | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 Debug.setBreakOnUncaughtException(); | |
| 62 Debug.setListener(listener); | |
| 63 | |
| 64 log.push("end main"); | |
| 65 | |
| 66 function testDone(iteration) { | |
| 67 function checkResult() { | |
| 68 try { | |
| 69 assertTrue(iteration < 10); | |
| 70 if (expected_events === 0) { | |
| 71 assertEquals(["resolve", "construct", "end main", | |
| 72 "reject caught", "throw in reject"], log); | |
| 73 } else { | |
| 74 testDone(iteration + 1); | |
| 75 } | |
| 76 } catch (e) { | |
| 77 %AbortJS(e + "\n" + e.stack); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 %EnqueueMicrotask(checkResult); | |
| 82 } | |
| 83 | |
| 84 testDone(0); | |
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