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| (Empty) |
| 1 <p></p> | |
| 2 | |
| 3 <pre id="console"></pre> | |
| 4 | |
| 5 <script> | |
| 6 function $(id) | |
| 7 { | |
| 8 return document.getElementById(id); | |
| 9 } | |
| 10 | |
| 11 function log(s) | |
| 12 { | |
| 13 $("console").appendChild(document.createTextNode(s + "\n")); | |
| 14 } | |
| 15 | |
| 16 function shouldBeNoEval(aDescription, a, b) | |
| 17 { | |
| 18 if (a === b) { | |
| 19 log("PASS: " + aDescription + " should be " + b + " and is."); | |
| 20 return; | |
| 21 } | |
| 22 | |
| 23 log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + "
."); | |
| 24 } | |
| 25 | |
| 26 if (window.testRunner) | |
| 27 testRunner.dumpAsText(); | |
| 28 | |
| 29 // eval should lazily create 'arguments'. | |
| 30 function f1() { | |
| 31 if (false) | |
| 32 return arguments; | |
| 33 return eval("arguments"); | |
| 34 } | |
| 35 shouldBeNoEval("f1(1)[0]", f1(1)[0], 1); | |
| 36 | |
| 37 // 'arguments' created by eval should be live. | |
| 38 function f2(x) { | |
| 39 var a = eval("arguments"); | |
| 40 x = 0; | |
| 41 return a; | |
| 42 } | |
| 43 shouldBeNoEval("f2(1)[0]", f2(1)[0], 0); | |
| 44 | |
| 45 // overwriting 'arguments' after lazily creating it should succeed. | |
| 46 function f3() { | |
| 47 var x = arguments; | |
| 48 var arguments = [0]; | |
| 49 return arguments; | |
| 50 } | |
| 51 shouldBeNoEval("f3(1)[0]", f3(1)[0], 0); | |
| 52 | |
| 53 // overwriting 'arguments' before lazily creating it should succeed. | |
| 54 function f4() { | |
| 55 var arguments = [0]; | |
| 56 var x = arguments; | |
| 57 return arguments; | |
| 58 } | |
| 59 shouldBeNoEval("f4(1)[0]", f4(1)[0], 0); | |
| 60 | |
| 61 // eval should access local, shared 'arguments'. | |
| 62 function f5() { | |
| 63 eval("arguments.x = 1"); | |
| 64 return eval("arguments"); | |
| 65 } | |
| 66 shouldBeNoEval("f5().x", f5().x, 1); | |
| 67 | |
| 68 // accessing another function's .arguments should not accidentally overwrite you
r own(!). | |
| 69 function f6() { | |
| 70 return g6(1); | |
| 71 } | |
| 72 function g6() { | |
| 73 f6.arguments; | |
| 74 return g6.arguments; | |
| 75 } | |
| 76 shouldBeNoEval("f6()[0]", f6()[0], 1); | |
| 77 | |
| 78 // access to another function's .arguments should not produce a shared object. | |
| 79 function f7() { | |
| 80 return g7(); | |
| 81 } | |
| 82 function g7() { | |
| 83 return f7.arguments === f7.arguments; | |
| 84 } | |
| 85 shouldBeNoEval("f7()", f7(), false); | |
| 86 | |
| 87 // ...unless the other function uses 'arguments'. | |
| 88 function f8() { | |
| 89 arguments; | |
| 90 return g8(); | |
| 91 } | |
| 92 function g8() { | |
| 93 return f7.arguments === f7.arguments; | |
| 94 } | |
| 95 shouldBeNoEval("f8()", f8(), true); | |
| 96 </script> | |
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