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// Copyright 2016 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: --harmony-async-await --expose-debug-as debug --allow-natives-syntax
// The test observes the callbacks that async/await makes to the inspector
// to make accurate stack traces. The pattern is based on saving a stack once
// with enqueueRecurring and restoring it multiple times.
// Additionally, the limited number of events is an indirect indication that
// we are not doing extra Promise processing that could be associated with memory
// leaks (v8:5380). In particular, no stacks are saved and restored for extra
// Promise handling on throwaway Promises.
// TODO(littledan): Write a test that demonstrates that the memory leak in
// the exception case is fixed.
Debug = debug.Debug;
var base_id = -1;
var exception = null;
var expected = [
'enqueueRecurring #1',
'willHandle #1',
'then #1',
'didHandle #1',
'willHandle #1',
'then #2',
'cancel #1',
'didHandle #1',
];
function assertLog(msg) {
print(msg);
assertTrue(expected.length > 0);
assertEquals(expected.shift(), msg);
if (!expected.length) {
Debug.setListener(null);
}
}
function listener(event, exec_state, event_data, data) {
if (event != Debug.DebugEvent.AsyncTaskEvent) return;
try {
if (base_id < 0)
base_id = event_data.id();
var id = event_data.id() - base_id + 1;
assertTrue("async function" == event_data.name());
assertLog(event_data.type() + " #" + id);
} catch (e) {
print(e + e.stack)
exception = e;
}
}
Debug.setListener(listener);
var resolver;
var p = new Promise(function(resolve, reject) {
resolver = resolve;
});
async function main() {
await p;
assertLog("then #1");
await undefined;
assertLog("then #2");
}
main();
resolver();
%RunMicrotasks();
assertNull(exception);
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