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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 --debug-eval-readonly-locals
     29 
     30 // If a function parameter is forced to be context allocated,
     31 // debug evaluate need to resolve it to a context slot instead of
     32 // parameter slot on the stack.
     33 
     34 var Debug = debug.Debug;
     35 
     36 var expected;
     37 var exception = null;
     38 
     39 function listener(event, exec_state, event_data, data) {
     40   if (event != Debug.DebugEvent.Break) return;
     41   try {
     42     assertEquals(expected, exec_state.frame(0).evaluate('arg').value());
     43     exec_state.frame(0).evaluate('arg = "evaluated";');  // no effect
     44   } catch (e) {
     45     exception = e;
     46   }
     47 }
     48 
     49 Debug.setListener(listener);
     50 
     51 function f(arg) {
     52   expected = arg;
     53   debugger;
     54   assertEquals(expected, arg);
     55 
     56   arg = "value";
     57   expected = arg;
     58   debugger;
     59   assertEquals(expected, arg);
     60 
     61   // Forces arg to be context allocated even though a parameter.
     62   function g() { arg; }
     63 }
     64 
     65 f();
     66 f(1);
     67 f(1, 2);
     68 
     69 assertNull(exception);
     70