[debugger] Further stepping support in test wrapper

test/mjsunit/debug-step-turbofan.js

-// Copyright 2014 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 --turbo-filter=g --allow-natives-syntax
-
-// Test that Debug::PrepareForBreakPoints can deal with turbofan code (g)
-// on the stack.  Without deoptimization support, we will not be able to
-// replace optimized code for g by unoptimized code with debug break slots.
-// This would cause stepping to fail (V8 issue 3660).
-
-function f(x) {
-  g(x);
-  var a = 0;              // Break 6
-  return a;               // Break 7
-}                         // Break 8
-
-function g(x) {
-  if (x) h();
-  var a = 0;              // Break 2
-  var b = 1;              // Break 3
-  return a + b;           // Break 4
-}                         // Break 5
-
-function h() {
-  debugger;               // Break 0
-}                         // Break 1
-
-Debug = debug.Debug;
-var exception = null;
-var break_count = 0;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    exec_state.prepareStep(Debug.StepAction.StepNext);
-    print(exec_state.frame(0).sourceLineText());
-    var match = exec_state.frame(0).sourceLineText().match(/Break (\d)/);
-    assertNotNull(match);
-    assertEquals(break_count++, parseInt(match[1]));
-  } catch (e) {
-    print(e + e.stack);
-    exception = e;
-  }
-}
-
-f(0);
-f(0);
-%OptimizeFunctionOnNextCall(g);
-
-Debug.setListener(listener);
-
-f(1);
-
-Debug.setListener(null);  // Break 9
-assertNull(exception);
-assertEquals(10, break_count);