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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,
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     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 // Make sure that eval can introduce a local variable called __proto__.
     29 // See http://code.google.com/p/v8/issues/detail?id=186
     30 
     31 var setterCalled = false;
     32 
     33 var o = {};
     34 o.__defineSetter__("x", function() { setterCalled = true; });
     35 
     36 function runTest(test) {
     37   setterCalled = false;
     38   test();
     39 }
     40 
     41 function testLocal() {
     42   // Add property called __proto__ to the extension object.
     43   eval("var __proto__ = o");
     44   // Check that the extension object's prototype did not change.
     45   eval("var x = 27");
     46   assertFalse(setterCalled, "prototype of extension object changed");
     47   assertEquals(o, eval("__proto__"));
     48 }
     49 
     50 function testConstLocal() {
     51   // Add const property called __proto__ to the extension object.
     52   eval("const __proto__ = o");
     53   // Check that the extension object's prototype did not change.
     54   eval("var x = 27");
     55   assertFalse(setterCalled, "prototype of extension object changed");
     56   assertEquals(o, eval("__proto__"));
     57 }
     58 
     59 function testGlobal() {
     60   // Assign to the global __proto__ property.
     61   eval("__proto__ = o");
     62   // Check that the prototype of the global object changed.
     63   eval("x = 27");
     64   assertTrue(setterCalled, "prototype of global object did not change");
     65   setterCalled = false;
     66   assertEquals(o, eval("__proto__"));
     67 }
     68 
     69 runTest(testLocal);
     70 runTest(testConstLocal);
     71 runTest(testGlobal);
     72 
     73