v8/test/debugger/debug/harmony/async-debug-step-abort-at-break.js

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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
var Debug = debug.Debug;
var step_count = 0;
function listener(event, execState, eventData, data) {
if (event != Debug.DebugEvent.Break) return;
try {
var line = execState.frame(0).sourceLineText();
print(line);
var [match, expected_count, step] = /\/\/ B(\d) (\w+)$/.exec(line);
assertEquals(step_count++, parseInt(expected_count));
if (step != "Continue") execState.prepareStep(Debug.StepAction[step]);
} catch (e) {
print(e, e.stack);
quit(1);
}
}
Debug.setListener(listener);
var late_resolve;
function g() {
return new Promise( // B3 StepOut
function(res, rej) {
late_resolve = res;
}
);
}
async function f() {
var a = 1;
debugger; // B0 StepNext
a += // B1 StepNext
await // B4 StepNext
g(); // B2 StepIn
return a;
}
f();
// Starting a new step action at an intermediate break point
// means that we will abort the current async step.
debugger; // B5 StepNext
late_resolve(3); // B6 Continue
%RunMicrotasks();
assertEquals(7, step_count);