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1// Copyright 2012 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.
30
31Debug = debug.Debug
32
33function FindCallFrame(exec_state, frame_code) {
34  var number = Number(frame_code);
35  if (number >= 0) {
36    return exec_state.frame(number);
37  } else {
38    for (var i = 0; i < exec_state.frameCount(); i++) {
39      var frame = exec_state.frame(i);
40      var func_mirror = frame.func();
41      if (frame_code == func_mirror.name()) {
42        return frame;
43      }
44    }
45  }
46  throw new Error("Failed to find function name " + function_name);
47}
48
49function TestCase(test_scenario, expected_output) {
50  // Global variable, accessed from eval'd script.
51  test_output = "";
52
53  function TestCode() {
54    function A() {
55      // Extra stack variable. To make function not slim.
56      // Restarter doesn't work on slim function when stopped on 'debugger'
57      // statement. (There is no padding for 'debugger' statement).
58      var o = {};
59      test_output += 'A';
60      test_output += '=';
61      debugger;
62      return 'Capybara';
63    }
64    function B(p1, p2) {
65      test_output += 'B';
66      return A();
67    }
68    function C() {
69      test_output += 'C';
70      // Function call with argument adaptor is intentional.
71      return B();
72    }
73    function D() {
74      test_output += 'D';
75      // Function call with argument adaptor is intentional.
76      return C(1, 2);
77    }
78    function E() {
79      test_output += 'E';
80      return D();
81    }
82    function F() {
83      test_output += 'F';
84      return E();
85    }
86    return F();
87  }
88
89  var scenario_pos = 0;
90
91  function DebuggerStatementHandler(exec_state) {
92    while (true) {
93      assertTrue(scenario_pos < test_scenario.length);
94      var change_code = test_scenario[scenario_pos++];
95      if (change_code == '=') {
96        // Continue.
97        return;
98      }
99      var frame = FindCallFrame(exec_state, change_code);
100      var error = frame.restart();
101      if (typeof error === 'string')
102          throw new Error(error);
103    }
104  }
105
106  var saved_exception = null;
107
108  function listener(event, exec_state, event_data, data) {
109    if (saved_exception != null) {
110      return;
111    }
112    if (event == Debug.DebugEvent.Break) {
113      try {
114        DebuggerStatementHandler(exec_state);
115      } catch (e) {
116        saved_exception = e;
117      }
118    } else {
119      print("Other: " + event);
120    }
121  }
122
123  Debug.setListener(listener);
124  assertEquals("Capybara", TestCode());
125  Debug.setListener(null);
126
127  if (saved_exception) {
128    print("Exception: " + saved_exception);
129    print("Stack: " + saved_exception.stack);
130    assertUnreachable();
131  }
132
133  print(test_output);
134
135  assertEquals(expected_output, test_output);
136}
137
138TestCase('0==', "FEDCBA=A=");
139TestCase('1==', "FEDCBA=BA=");
140TestCase('2==', "FEDCBA=CBA=");
141TestCase('3==', "FEDCBA=DCBA=");
142TestCase('4==', "FEDCBA=EDCBA=");
143TestCase('5==', "FEDCBA=FEDCBA=");
144
145TestCase('=', "FEDCBA=");
146
147TestCase('C==', "FEDCBA=CBA=");
148
149TestCase('B=C=A=D==', "FEDCBA=BA=CBA=A=DCBA=");
150
151// Successive restarts don't work now and require additional fix.
152//TestCase('BCDE==', "FEDCBA=EDCBA=");
153//TestCase('BC=BCDE==', "FEDCBA=CBA=EDCBA=");
154//TestCase('EF==', "FEDCBA=FEDCBA=");
155