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/js/src/jit-test/tests/basic/testInt32ToId.js

http://github.com/zpao/v8monkey
JavaScript | 35 lines | 23 code | 3 blank | 9 comment | 2 complexity | 3a5ff03d5502b85950536116cd8a03fe MD5 | raw file
 1function testInt32ToId()
 2{
 3  // Ensure that a property which is a negative integer that does not fit in a
 4  // jsval is properly detected by the 'in' operator.
 5  var obj = { "-1073741828": 17 };
 6  var index = -1073741819;
 7  var a = [];
 8  for (var i = 0; i < 10; i++)
 9  {
10    a.push(index in obj);
11    index--;
12  }
13
14  // Ensure that a property which is a negative integer that does not fit in a
15  // jsval is properly *not* detected by the 'in' operator.  In this case
16  // wrongly applying INT_TO_JSID to -2147483648 will shift off the sign bit
17  // (the only bit set in that number) and bitwise-or that value with 1,
18  // producing jsid(1) -- which actually represents "0", not "-2147483648".
19  // Thus 'in' will report a "-2147483648" property when none exists, because
20  // it thinks the request was really whether the object had property "0".
21  var obj2 = { 0: 17 };
22  var b = [];
23  var index = -(1 << 28);
24  for (var i = 0; i < 10; i++)
25  {
26    b.push(index in obj2);
27    index = index - (1 << 28);
28  }
29
30  return a.join(",") + b.join(",");
31}
32
33assertEq(testInt32ToId(),   
34	 "false,false,false,false,false,false,false,false,false,true" +
35	 "false,false,false,false,false,false,false,false,false,false");