1// Copyright 2010 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --expose-debug-as debug
29// Get the Debug object exposed from the debug context global object.
30Debug = debug.Debug
31
32
33function ParsedResponse(json) {
34  this.response_ = eval('(' + json + ')');
35  this.refs_ = [];
36  if (this.response_.refs) {
37    for (var i = 0; i < this.response_.refs.length; i++) {
38      this.refs_[this.response_.refs[i].handle] = this.response_.refs[i];
39    }
40  }
41}
42
43
44ParsedResponse.prototype.response = function() {
45  return this.response_;
46}
47
48
49ParsedResponse.prototype.body = function() {
50  return this.response_.body;
51}
52
53
54ParsedResponse.prototype.running = function() {
55  return this.response_.running;
56}
57
58
59ParsedResponse.prototype.lookup = function(handle) {
60  return this.refs_[handle];
61}
62
63
64listener_complete = false;
65exception = false;
66break_count = 0;
67expected_return_value = 0;
68debugger_source_position = 0;
69
70// Listener which expects to do four steps to reach returning from the function.
71function listener(event, exec_state, event_data, data) {
72  try {
73    if (event == Debug.DebugEvent.Break)
74    {
75      break_count++;
76      if (break_count < 4) {
77        assertFalse(exec_state.frame(0).isAtReturn())
78        switch (break_count) {
79          case 1:
80            // Collect the position of the debugger statement.
81            debugger_source_position = exec_state.frame(0).sourcePosition();
82            break;
83          case 2:
84            // Position now at the if statement.
85            assertEquals(debugger_source_position + 10,
86                         exec_state.frame(0).sourcePosition());
87            break;
88          case 3:
89            // Position now at either of the returns.
90            if (expected_return_value == 1) {
91              assertEquals(debugger_source_position + 19,
92                           exec_state.frame(0).sourcePosition());
93            } else {
94              assertEquals(debugger_source_position + 38,
95                           exec_state.frame(0).sourcePosition());
96            }
97            break;
98          default:
99            fail("Unexpected");
100        }
101        exec_state.prepareStep(Debug.StepAction.StepIn, 1);
102      } else {
103        // Position at the end of the function.
104        assertEquals(debugger_source_position + 50,
105        exec_state.frame(0).sourcePosition());
106
107        // Just about to return from the function.
108        assertTrue(exec_state.frame(0).isAtReturn())
109        assertEquals(expected_return_value,
110                     exec_state.frame(0).returnValue().value());
111
112        // Check the same using the JSON commands.
113        var dcp = exec_state.debugCommandProcessor(false);
114        var request = '{"seq":0,"type":"request","command":"backtrace"}';
115        var resp = dcp.processDebugJSONRequest(request);
116        response = new ParsedResponse(resp);
117        frames = response.body().frames;
118        assertTrue(frames[0].atReturn);
119        assertEquals(expected_return_value,
120                     response.lookup(frames[0].returnValue.ref).value);
121
122        listener_complete = true;
123      }
124    }
125  } catch (e) {
126    exception = e
127  };
128};
129
130// Add the debug event listener.
131Debug.setListener(listener);
132
133// Four steps from the debugger statement in this function will position us at
134// the function return.
135//             0         1         2         3         4         5
136//             0123456789012345678901234567890123456789012345678901
137
138function f(x) {debugger; if (x) { return 1; } else { return 2; } };
139
140// Call f expecting different return values.
141break_count = 0;
142expected_return_value = 2;
143listener_complete = false;
144f();
145assertFalse(exception, "exception in listener")
146assertTrue(listener_complete);
147assertEquals(4, break_count);
148
149break_count = 0;
150expected_return_value = 1;
151listener_complete = false;
152f(true);
153assertFalse(exception, "exception in listener")
154assertTrue(listener_complete);
155assertEquals(4, break_count);
156
157break_count = 0;
158expected_return_value = 2;
159listener_complete = false;
160f(false);
161assertFalse(exception, "exception in listener")
162assertTrue(listener_complete);
163assertEquals(4, break_count);
164