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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 // Simple debug event handler which first time hit will perform 1000 steps and
     33 // second time hit will evaluate and store the value of "i". If requires that
     34 // the global property "state" is initially zero.
     35 
     36 var bp1, bp2;
     37 
     38 function listener(event, exec_state, event_data, data) {
     39   if (event == Debug.DebugEvent.Break) {
     40     if (state == 0) {
     41       exec_state.prepareStep(Debug.StepAction.StepIn, 1000);
     42       state = 1;
     43     } else if (state == 1) {
     44       result = exec_state.frame().evaluate("i").value();
     45       // Clear the break point on line 2 if set.
     46       if (bp2) {
     47         Debug.clearBreakPoint(bp2);
     48       }
     49     }
     50   }
     51 };
     52 
     53 // Add the debug event listener.
     54 Debug.setListener(listener);
     55 
     56 // Test debug event for break point.
     57 function f() {
     58   var i;                        // Line 1.
     59   for (i = 0; i < 1000; i++) {  // Line 2.
     60     x = 1;                      // Line 3.
     61   }
     62 };
     63 
     64 // Set a breakpoint on the for statement (line 1).
     65 bp1 = Debug.setBreakPoint(f, 1);
     66 
     67 // Check that performing 1000 steps will make i 499.
     68 state = 0;
     69 result = -1;
     70 f();
     71 assertEquals(499, result);
     72 
     73 // Check that performing 1000 steps with a break point on the statement in the
     74 // for loop (line 2) will only make i 0 as a real break point breaks even when
     75 // multiple steps have been requested.
     76 state = 0;
     77 result = -1;
     78 bp2 = Debug.setBreakPoint(f, 3);
     79 f();
     80 assertEquals(0, result);
     81 
     82 // Get rid of the debug event listener.
     83 Debug.setListener(null);
     84