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      1 // Copyright 2015 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 a
      8 // Promise p3 created by Promise.race has no catch handler, and is rejected
      9 // because one of the Promises p2 passed to Promise.all is rejected. We
     10 // expect two Exception debug events to be triggered, for p2 and p3 each,
     11 // because neither has an user-defined catch handler.
     12 
     13 var Debug = debug.Debug;
     14 
     15 var expected_events = 2;
     16 var log = [];
     17 
     18 var p1 = Promise.resolve();
     19 p1.name = "p1";
     20 
     21 var p2 = p1.then(function() {
     22   log.push("throw");
     23   throw new Error("uncaught");  // event
     24 });
     25 
     26 p2.name = "p2";
     27 
     28 var p3 = Promise.race([p2]);
     29 p3.name = "p3";
     30 
     31 function listener(event, exec_state, event_data, data) {
     32   if (event != Debug.DebugEvent.Exception) return;
     33   try {
     34     expected_events--;
     35     assertTrue(expected_events >= 0);
     36     assertEquals("uncaught", event_data.exception().message);
     37     assertTrue(event_data.promise() instanceof Promise);
     38     if (expected_events === 1) {
     39       // Assert that the debug event is triggered at the throw site.
     40       assertTrue(exec_state.frame(0).sourceLineText().indexOf("// event") > 0);
     41       assertEquals("p2", event_data.promise().name);
     42     } else {
     43       assertEquals("p3", event_data.promise().name);
     44     }
     45     assertTrue(event_data.uncaught());
     46   } catch (e) {
     47     %AbortJS(e + "\n" + e.stack);
     48   }
     49 }
     50 
     51 Debug.setBreakOnUncaughtException();
     52 Debug.setListener(listener);
     53 
     54 log.push("end main");
     55 
     56 function testDone(iteration) {
     57   function checkResult() {
     58     try {
     59       assertTrue(iteration < 10);
     60       if (expected_events === 0) {
     61         assertEquals(["end main", "throw"], log);
     62       } else {
     63         testDone(iteration + 1);
     64       }
     65     } catch (e) {
     66       %AbortJS(e + "\n" + e.stack);
     67     }
     68   }
     69 
     70   %EnqueueMicrotask(checkResult);
     71 }
     72 
     73 testDone(0);
     74