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      1 // Copyright 2008 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 Debug = debug.Debug
     31 
     32 // Tests how debugger can step over not necessarily in the top frame.
     33 
     34 // Simple 3 functions, that protocol their execution state in global
     35 // variable state.
     36 var state;
     37 
     38 function f() {
     39   var a = 1978;
     40   for (state[2] = 0; state[2] < 3; state[2]++) {
     41     void String(a);
     42   }
     43 }
     44 function g() {
     45   for (state[1] = 0; state[1] < 3; state[1]++) {
     46     f();
     47   }
     48 }
     49 function h() {
     50   state = [-1, -1, -1];
     51   for (state[0] = 0; state[0] < 3; state[0]++) {
     52     g();
     53   }
     54 }
     55 
     56 function TestCase(frame_index, step_count, expected_final_state) {
     57   print("Test case, parameters " + frame_index + "/" + step_count);
     58 
     59   var listener_exception = null;
     60   var state_snapshot;
     61   var listener_state;
     62   var bp;
     63 
     64   function listener(event, exec_state, event_data, data) {
     65     print("Here ("+event+"/"+listener_state+"): " +
     66         exec_state.frame(0).sourceLineText());
     67     try {
     68       if (event == Debug.DebugEvent.Break) {
     69         if (listener_state == 0) {
     70           Debug.clearBreakPoint(bp);
     71           var context_frame;
     72           if (frame_index !== undefined) {
     73             context_frame = exec_state.frame(frame_index);
     74           }
     75           exec_state.prepareStep(Debug.StepAction.StepNext,
     76               step_count, context_frame);
     77           listener_state = 1;
     78         } else if (listener_state == 1) {
     79           state_snapshot = String(state);
     80           print("State: " + state_snapshot);
     81           Debug.setListener(null);
     82           listener_state = 2;
     83         }
     84       }
     85     } catch (e) {
     86       listener_exception = e;
     87     }
     88   }
     89 
     90 
     91   // Add the debug event listener.
     92   listener_state = 0;
     93   Debug.setListener(listener);
     94   bp = Debug.setBreakPoint(f, 1);
     95 
     96   h();
     97   Debug.setListener(null);
     98   if (listener_exception !== null) {
     99     print("Exception caught: " + listener_exception);
    100     assertUnreachable();
    101   }
    102 
    103   assertEquals(expected_final_state, state_snapshot);
    104 }
    105 
    106 
    107 // Warm-up -- make sure all is compiled and ready for breakpoint.
    108 h();
    109 
    110 
    111 // Stepping in the default (top) frame.
    112 TestCase(undefined, 0, "0,0,-1");
    113 TestCase(undefined, 1, "0,0,-1");
    114 TestCase(undefined, 2, "0,0,0");
    115 TestCase(undefined, 5, "0,0,1");
    116 TestCase(undefined, 8, "0,0,3");
    117 
    118 // Stepping in the frame #0 (should be exactly the same as above).
    119 TestCase(0, 0, "0,0,-1");
    120 TestCase(0, 1, "0,0,-1");
    121 TestCase(0, 2, "0,0,0");
    122 TestCase(0, 5, "0,0,1");
    123 TestCase(0, 8, "0,0,3");
    124 
    125 // Stepping in the frame #1.
    126 TestCase(1, 0, "0,0,3");
    127 TestCase(1, 3, "0,1,3");
    128 TestCase(1, 7, "0,3,3");
    129 
    130 // Stepping in the frame #2.
    131 TestCase(2, 3, "1,3,3");
    132 TestCase(2, 7, "3,3,3");
    133