[debugger] Basic scope functionality and exception events in wrapper

test/mjsunit/es6/debug-promises/stepin-handler.js

-// Copyright 2015 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 --allow-natives-syntax --noalways-opt
-// Tests stepping into through Promises.
-
-Debug = debug.Debug
-var exception = null;
-var break_count = 0;
-var expected_breaks = -1;
-
-function listener(event, exec_state, event_data, data) {
-  try {
-    if (event == Debug.DebugEvent.Break) {
-      assertTrue(exec_state.frameCount() != 0, "FAIL: Empty stack trace");
-      if (!break_count) {
-        // Count number of expected breakpoints in this source file.
-        var source_text = exec_state.frame(0).func().script().source();
-        expected_breaks = source_text.match(/\/\/\s*Break\s+\d+\./g).length;
-        print("Expected breaks: " + expected_breaks);
-      }
-      var source = exec_state.frame(0).sourceLineText();
-      print("paused at: " + source);
-      assertTrue(source.indexOf("// Break " + break_count + ".") > 0,
-                 "Unexpected pause at: " + source + "\n" +
-                 "Expected: // Break " + break_count + ".");
-      ++break_count;
-      if (break_count !== expected_breaks) {
-        exec_state.prepareStep(Debug.StepAction.StepIn);
-      }
-    }
-  } catch(e) {
-    exception = e;
-    print(e, e.stack);
-  }
-};
-
-Debug.setListener(listener);
-
-Promise.resolve(42)
-  .then(
-    function f0() {
-      debugger;  // Break 0.
-    } // Break 1.
-  )
-  .then(callback)
-  .then(callback.bind(null))
-  .then(Object)
-  .then(callback.bind(null).bind(null))
-  .then(finalize)
-  .catch(function(err) {
-    %AbortJS("FAIL: " + err);
-  });
-
-function callback(x) {
-  return x; // Break 2. // Break 4. // Break 6.
-} // Break 3. // Break 5. // Break 7.
-
-function finalize() {
-  assertNull(exception); // Break 8.
-  assertEquals(expected_breaks, break_count);
-
-  Debug.setListener(null);
-}