[debugger] Various break-related functionality in test wrapper

test/mjsunit/debug-step-4.js

-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
-Debug = debug.Debug
-
-// Tests how debugger can step over not necessarily in the top frame.
-
-// Simple 3 functions, that protocol their execution state in global
-// variable state.
-var state;
-
-function f() {
-  var a = 1978;
-  for (state[2] = 0; state[2] < 3; state[2]++) {
-    void String(a);
-  }
-}
-function g() {
-  for (state[1] = 0; state[1] < 3; state[1]++) {
-    f();
-  }
-}
-function h() {
-  state = [-1, -1, -1];
-  for (state[0] = 0; state[0] < 3; state[0]++) {
-    g();
-  }
-}
-
-function TestCase(expected_final_state) {
-  var listener_exception = null;
-  var state_snapshot;
-  var listener_state;
-  var bp;
-
-  function listener(event, exec_state, event_data, data) {
-    print("Here ("+event+"/"+listener_state+"): " +
-        exec_state.frame(0).sourceLineText());
-    try {
-      if (event == Debug.DebugEvent.Break) {
-        if (listener_state == 0) {
-          Debug.clearBreakPoint(bp);
-          exec_state.prepareStep(Debug.StepAction.StepNext);
-          listener_state = 1;
-        } else if (listener_state == 1) {
-          state_snapshot = String(state);
-          print("State: " + state_snapshot);
-          Debug.setListener(null);
-          listener_state = 2;
-        }
-      }
-    } catch (e) {
-      listener_exception = e;
-    }
-  }
-
-
-  // Add the debug event listener.
-  listener_state = 0;
-  Debug.setListener(listener);
-  bp = Debug.setBreakPoint(f, 1);
-
-  h();
-  Debug.setListener(null);
-  if (listener_exception !== null) {
-    print("Exception caught: " + listener_exception);
-    assertUnreachable();
-  }
-
-  assertEquals(expected_final_state, state_snapshot);
-}
-
-
-// Warm-up -- make sure all is compiled and ready for breakpoint.
-h();
-
-TestCase("0,0,-1");