test/mjsunit/debug-generator-break.js

// 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: --expose-debug-as debug --ignition-generators

var Debug = debug.Debug;

var break_count = 0;
var exception = null;

function listener(event, exec_state, event_data, data) {
  if (event != Debug.DebugEvent.Break) return;
  try {
    break_count++;
    var line = exec_state.frame(0).sourceLineText();
    assertTrue(line.indexOf(`B${break_count}`) > 0);
  } catch (e) {
    exception = e;
  }
}

Debug.setListener(listener);

function* g() {
  yield 1;
}

function* f() {
  yield* g();                    // B1
  assertEquals(2, break_count);  // B2
  return 1;                      // B3
}

Debug.setBreakPoint(f, 1);
Debug.setBreakPoint(f, 2);
Debug.setBreakPoint(f, 3);

for (let _ of f()) { }

assertEquals(3, break_count);
assertNull(exception);

Debug.setListener(null);