// 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. // Test debug events when a Promise is rejected, which is caught by a // custom promise, which throws a new exception in its reject handler. // We expect two Exception debug events: // 1) when promise q is rejected. // 2) when the custom reject closure in MyPromise throws an exception. Debug = debug.Debug; var expected_events = 1; var log = []; var p = new Promise(function(resolve, reject) { log.push("resolve"); resolve(); }); function MyPromise(resolver) { var reject = function() { log.push("throw in reject"); throw new Error("reject"); // event }; var resolve = function() { }; log.push("construct"); resolver(resolve, reject); }; MyPromise.prototype = new Promise(function() {}); p.constructor = MyPromise; var q = p.then( function() { log.push("reject caught"); return Promise.reject(new Error("caught")); }); function listener(event, exec_state, event_data, data) { try { if (event == Debug.DebugEvent.Exception) { expected_events--; assertTrue(expected_events >= 0); assertEquals("reject", event_data.exception().message); // Assert that the debug event is triggered at the throw site. assertTrue( exec_state.frame(0).sourceLineText().indexOf("// event") > 0); } } catch (e) { // Signal a failure with exit code 1. This is necessary since the // debugger swallows exceptions and we expect the chained function // and this listener to be executed after the main script is finished. print("Unexpected exception: " + e + "\n" + e.stack); quit(1); } } 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", "reject caught", "throw in reject"], log); } else { testDone(iteration + 1); } } catch (e) { %AbortJS(e + "\n" + e.stack); } } %EnqueueMicrotask(checkResult); } testDone(0);