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comparison: js/src/jit-test/tests/arrays/push-densely-loopy-nonwritable-length.js
js/src/jit-test/tests/arrays/push-densely-loopy-nonwritable-length.js
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- 6474c204b198
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| -1:000000000000 | 0:4150fef419cb |
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| 1 // Force recognition of a known-constant. | |
| 2 var push = Array.prototype.push; | |
| 3 | |
| 4 function f(arr) | |
| 5 { | |
| 6 // Push an actual constant to trigger JIT-inlining of the effect of the push. | |
| 7 push.call(arr, 99); | |
| 8 } | |
| 9 | |
| 10 function basic(out) | |
| 11 { | |
| 12 // Create an array of arrays, to be iterated over for [].push-calling. We | |
| 13 // can't just loop on push on a single array with non-writable length because | |
| 14 // push throws when called on an array with non-writable length. | |
| 15 var arrs = out.arrs = []; | |
| 16 for (var i = 0; i < 100; i++) | |
| 17 arrs.push([]); | |
| 18 | |
| 19 // Use a much-greater capacity than the eventual non-writable length. | |
| 20 var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; | |
| 21 Object.defineProperty(a, "length", { writable: false, value: 6 }); | |
| 22 | |
| 23 arrs.push(a); | |
| 24 | |
| 25 for (var i = 0, sz = arrs.length; i < sz; i++) | |
| 26 { | |
| 27 var arr = arrs[i]; | |
| 28 f(arr); | |
| 29 } | |
| 30 } | |
| 31 | |
| 32 var obj = {}; | |
| 33 var arrs, a; | |
| 34 | |
| 35 try | |
| 36 { | |
| 37 basic(obj); | |
| 38 throw new Error("didn't throw!"); | |
| 39 } | |
| 40 catch (e) | |
| 41 { | |
| 42 assertEq(e instanceof TypeError, true, "expected TypeError, got " + e); | |
| 43 | |
| 44 arrs = obj.arrs; | |
| 45 assertEq(arrs.length, 101); | |
| 46 for (var i = 0; i < 100; i++) | |
| 47 { | |
| 48 assertEq(arrs[i].length, 1, "unexpected length for arrs[" + i + "]"); | |
| 49 assertEq(arrs[i][0], 99, "bad element for arrs[" + i + "]"); | |
| 50 } | |
| 51 | |
| 52 a = arrs[100]; | |
| 53 assertEq(a.hasOwnProperty(6), false); | |
| 54 assertEq(a[6], undefined); | |
| 55 assertEq(a.length, 6); | |
| 56 } |
