Home | History | Annotate | Download | only in mjsunit 
      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 --debug-eval-readonly-locals
     29 // Get the Debug object exposed from the debug context global object.
     30 Debug = debug.Debug
     31 
     32 listenerComplete = false;
     33 exception = false;
     34 
     35 
     36 function h() {
     37   var a = 1;
     38   var b = 2;
     39   var eval = 5;  // Overriding eval should not break anything.
     40   debugger;  // Breakpoint.
     41   return a;
     42 }
     43 
     44 function checkFrame0(frame) {
     45   // Frame 0 (h) has normal variables a and b.
     46   var count = frame.localCount();
     47   assertEquals(3, count);
     48   for (var i = 0; i < count; ++i) {
     49     var name = frame.localName(i);
     50     var value = frame.localValue(i).value();
     51     if (name == 'a') {
     52       assertEquals(1, value);
     53     } else if (name !='eval') {
     54       assertEquals('b', name);
     55       assertEquals(2, value);
     56     }
     57   }
     58 }
     59 
     60 
     61 function g() {
     62   var a = 3;
     63   eval("var b = 4;");
     64   return h() + a;
     65 }
     66 
     67 function checkFrame1(frame) {
     68   // Frame 1 (g) has normal variable a (and arguments).
     69   var count = frame.localCount();
     70   assertEquals(2, count);
     71   for (var i = 0; i < count; ++i) {
     72     var name = frame.localName(i);
     73     var value = frame.localValue(i).value();
     74     if (name == 'a') {
     75       assertEquals(3, value);
     76     } else {
     77       assertEquals('arguments', name);
     78     }
     79   }
     80 }
     81 
     82 
     83 function f() {
     84   var a = 5;
     85   var b = 0;
     86   with ({b:6}) {
     87     return g();
     88   }
     89 }
     90 
     91 function checkFrame2(frame) {
     92   // Frame 2 (f) has normal variables a and b (and arguments).
     93   var count = frame.localCount();
     94   assertEquals(3, count);
     95   for (var i = 0; i < count; ++i) {
     96     var name = frame.localName(i);
     97     var value = frame.localValue(i).value();
     98     if (name == 'a') {
     99       assertEquals(5, value);
    100     } else if (name == 'b') {
    101       assertEquals(0, value);
    102     } else {
    103       assertEquals('arguments', name);
    104     }
    105   }
    106 }
    107 
    108 
    109 function listener(event, exec_state, event_data, data) {
    110   try {
    111     if (event == Debug.DebugEvent.Break)
    112     {
    113       checkFrame0(exec_state.frame(0));
    114       checkFrame1(exec_state.frame(1));
    115       checkFrame2(exec_state.frame(2));
    116 
    117       // Evaluating a and b on frames 0, 1 and 2 produces 1, 2, 3, 4, 5 and 6.
    118       assertEquals(1, exec_state.frame(0).evaluate('a').value());
    119       assertEquals(2, exec_state.frame(0).evaluate('b').value());
    120       assertEquals(5, exec_state.frame(0).evaluate('eval').value());
    121       assertEquals(3, exec_state.frame(1).evaluate('a').value());
    122       // Reference error because g does not reference b.
    123       assertThrows(() => exec_state.frame(1).evaluate('b'), ReferenceError);
    124       assertEquals("function",
    125                    typeof exec_state.frame(1).evaluate('eval').value());
    126       assertEquals(5, exec_state.frame(2).evaluate('a').value());
    127       assertEquals(6, exec_state.frame(2).evaluate('b').value());
    128       assertEquals("function",
    129                    typeof exec_state.frame(2).evaluate('eval').value());
    130       // Assignments to local variables only have temporary effect.
    131       assertEquals("foo",
    132                    exec_state.frame(0).evaluate('a = "foo"').value());
    133       assertEquals("bar",
    134                    exec_state.frame(1).evaluate('a = "bar"').value());
    135       // Indicate that all was processed.
    136       listenerComplete = true;
    137     }
    138   } catch (e) {
    139     exception = e;
    140     print("Caught something. " + e + " " + e.stack);
    141   };
    142 };
    143 
    144 // Add the debug event listener.
    145 Debug.setListener(listener);
    146 
    147 var f_result = f();
    148 
    149 assertEquals(4, f_result);
    150 
    151 // Make sure that the debug event listener was invoked.
    152 assertFalse(exception, "exception in listener")
    153 assertTrue(listenerComplete);
    154