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      1 // Copyright 2013 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 
     30 Debug = debug.Debug
     31 
     32 listenerComplete = false;
     33 exception = false;
     34 
     35 // var0:   init after break point, changed by debug eval.
     36 // const0: init before break point, changed by debug eval.
     37 // const1: init after break point, materialized but untouched by debug eval.
     38 // const2: init after break point, materialized and changed by debug eval.
     39 // const3: context allocated const, init before break point, changed by eval.
     40 function f() {
     41   var var1 = 21;
     42   const const3 = 3;
     43 
     44   function g() {
     45     const const0 = 0;
     46     assertEquals(undefined, const1);
     47     assertEquals(undefined, const2);
     48     assertEquals(3, const3);
     49     assertEquals(21, var1);
     50 
     51     debugger;  // Break point.
     52 
     53     assertEquals(30, var0);
     54     // TODO(yangguo): debug evaluate should not be able to alter
     55     //                stack-allocated const values
     56     // assertEquals(0, const0);
     57     assertEquals(undefined, const1);
     58     assertEquals(undefined, const2);
     59     var var0 = 20;
     60     const const1 = 1;
     61     const const2 = 2;
     62     assertEquals(20, var0);
     63     assertEquals(1, const1);
     64     assertEquals(2, const2);
     65   }
     66 
     67   g();
     68 
     69   assertEquals(31, var1);
     70   assertEquals(3, const3);
     71 }
     72 
     73 
     74 function listener(event, exec_state, event_data, data) {
     75   if (event != Debug.DebugEvent.Break) return;
     76   try {
     77     var frame = exec_state.frame(0);
     78     var evaluate = function(something) {
     79       return frame.evaluate(something).value()
     80     }
     81 
     82     var count = frame.localCount();
     83     assertEquals(4, count);
     84     var expectation = { "const0" : 0,
     85                         "const1" : undefined,
     86                         "const2" : undefined,
     87                         "const3" : 3,
     88                         "var0"   : undefined,
     89                         "var1"   : 21 };
     90     for (var i = 0; i < frame.localCount(); ++i) {
     91       var name = frame.localName(i);
     92       var value = frame.localValue(i).value();
     93       assertEquals(expectation[name], value);
     94     }
     95 
     96     evaluate('const0 = 10');
     97     evaluate('const2 = 12');
     98     evaluate('const3 = 13');
     99     evaluate('var0 = 30');
    100     evaluate('var1 = 31');
    101 
    102     // Indicate that all was processed.
    103     listenerComplete = true;
    104   } catch (e) {
    105     exception = e;
    106     print("Caught something. " + e + " " + e.stack);
    107   };
    108 };
    109 
    110 // Run and compile before debugger is active.
    111 try { f(); } catch (e) { }
    112 
    113 Debug.setListener(listener);
    114 
    115 f();
    116 
    117 Debug.setListener(null);
    118 
    119 assertFalse(exception, "exception in listener")
    120 assertTrue(listenerComplete);
    121