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      1 // Copyright 2009 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 var exception = null;
     33 var state = 0;
     34 var expected_function_name = null;
     35 var expected_source_line_text = null;
     36 var expected_caller_source_line = null;
     37 var step_in_count = 2;
     38 
     39 // Simple debug event handler which first time will cause 'step in' action
     40 // to get into g.call and than check that execution is pauesed inside
     41 // function 'g'.
     42 function listener(event, exec_state, event_data, data) {
     43   try {
     44     if (event == Debug.DebugEvent.Break) {
     45       if (state == 0) {
     46         // Step into f().
     47         exec_state.prepareStep(Debug.StepAction.StepIn, step_in_count);
     48         state = 2;
     49       } else if (state == 2) {
     50         assertEquals(expected_source_line_text,
     51                      event_data.sourceLineText());
     52         assertEquals(expected_function_name, event_data.func().name());
     53         state = 3;
     54       }
     55     }
     56   } catch(e) {
     57     exception = e;
     58   }
     59 };
     60 
     61 // Add the debug event listener.
     62 Debug.setListener(listener);
     63 
     64 
     65 function g() { 
     66    return "s";  // expected line
     67 }
     68 
     69 function testFunction() {
     70   var f = g;
     71   var s = 1 +f(10);
     72 }
     73 
     74 function g2() { 
     75    return "s2";  // expected line
     76 }
     77 
     78 function testFunction2() {
     79   var f = g2;
     80   var s = 1 +f(10, 20);
     81 }
     82 
     83 // Run three times. First time the function will be compiled lazily,
     84 // second time cached version will be used.
     85 for (var i = 0; i < 3; i++) {
     86   state = 0;
     87   expected_function_name = 'g';
     88   expected_source_line_text = '   return "s";  // expected line';
     89   step_in_count = 2;
     90   // Set a break point and call to invoke the debug event listener.
     91   Debug.setBreakPoint(testFunction, 1, 0);
     92   testFunction();
     93   assertNull(exception);
     94   assertEquals(3, state);
     95 }
     96 
     97 // Test stepping into function call when a breakpoint is set at the place
     98 // of call. Use different pair of functions so that g2 is compiled lazily.
     99 // Run twice: first time function will be compiled lazily, second time
    100 // cached version will be used.
    101 for (var i = 0; i < 3; i++) {
    102   state = 0;
    103   expected_function_name = 'g2';
    104   expected_source_line_text = '   return "s2";  // expected line';
    105   step_in_count = 1;
    106   // Set a break point and call to invoke the debug event listener.
    107   Debug.setBreakPoint(testFunction2, 2, 0);
    108   testFunction2();
    109   assertNull(exception);
    110   assertEquals(3, state);
    111 }
    112 
    113 
    114 // Get rid of the debug event listener.
    115 Debug.setListener(null);
    116