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 we only listen to uncaught exceptions and 8 // there is only a default reject handler for the to-be-rejected Promise. 9 // We expect two Exception debug events: 10 // - when the first Promise is rejected and only has default reject handlers. 11 // - when the default reject handler passes the rejection on. 12 13 Debug = debug.Debug; 14 15 var expected_events = 2; 16 var log = []; 17 18 var resolve, reject; 19 var p0 = new Promise(function(res, rej) { resolve = res; reject = rej; }); 20 var p1 = p0.then(function() { 21 log.push("p0.then"); 22 throw new Error("123"); // event 23 }); 24 var p2 = p1.then(function() { 25 log.push("p1.then"); 26 }); 27 28 var q = new Promise(function(res, rej) { 29 log.push("resolve q"); 30 res(); 31 }); 32 33 q.then(function() { 34 log.push("resolve p"); 35 resolve(); 36 }) 37 38 39 function listener(event, exec_state, event_data, data) { 40 try { 41 if (event == Debug.DebugEvent.Exception) { 42 expected_events--; 43 assertTrue(expected_events >= 0); 44 assertTrue(event_data.uncaught()); 45 assertTrue(event_data.promise() instanceof Promise); 46 if (expected_events == 1) { 47 // p1 is rejected, uncaught except for its default reject handler. 48 assertTrue( 49 exec_state.frame(0).sourceLineText().indexOf("// event") > 0); 50 assertSame(p1, event_data.promise()); 51 } else { 52 // p2 is rejected by p1's default reject handler. 53 assertEquals(0, exec_state.frameCount()); 54 assertSame(p2, event_data.promise()); 55 } 56 } 57 } catch (e) { 58 %AbortJS(e + "\n" + e.stack); 59 } 60 } 61 62 Debug.setBreakOnUncaughtException(); 63 Debug.setListener(listener); 64 65 log.push("end main"); 66 67 function testDone(iteration) { 68 function checkResult() { 69 try { 70 assertTrue(iteration < 10); 71 if (expected_events === 0) { 72 assertEquals(["resolve q", "end main", "resolve p", "p0.then"], 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); 85
