// Copyright 2014 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 --allow-natives-syntax --promise-extra // Test debug events when an exception is thrown inside a Promise, which is // caught by a custom promise, which has no reject handler. // We expect two Exception debug events: // 1) when the exception is thrown in the promise q. // 2) when calling the undefined custom reject closure in MyPromise throws. Debug = debug.Debug; var expected_events = 2; var log = []; var p = new Promise(function(resolve, reject) { log.push("resolve"); resolve(); }); function MyPromise(resolver) { var reject = undefined; var resolve = function() { }; log.push("construct"); resolver(resolve, reject); }; MyPromise.prototype = new Promise(function() {}); p.constructor = MyPromise; var q = p.chain( function() { log.push("throw caught"); throw new Error("caught"); // event }); function listener(event, exec_state, event_data, data) { try { if (event == Debug.DebugEvent.Exception) { expected_events--; assertTrue(expected_events >= 0); if (expected_events == 1) { assertTrue( exec_state.frame(0).sourceLineText().indexOf('// event') > 0); assertEquals("caught", event_data.exception().message); } else if (expected_events == 0) { // All of the frames on the stack are from native Javascript. assertEquals(0, exec_state.frameCount()); assertEquals("(var).reject is not a function", event_data.exception().message); } else { assertUnreachable(); } assertSame(q, event_data.promise()); } } catch (e) { %AbortJS(e + "\n" + e.stack); } } Debug.setBreakOnUncaughtException(); Debug.setListener(listener); log.push("end main"); function testDone(iteration) { function checkResult() { try { assertTrue(iteration < 10); if (expected_events === 0) { assertEquals(["resolve", "construct", "end main", "throw caught"], log); } else { testDone(iteration + 1); } } catch (e) { %AbortJS(e + "\n" + e.stack); } } %EnqueueMicrotask(checkResult); } testDone(0);