The Tor Browser / file comparison
comparison: js/src/tests/js1_8_5/regress/regress-554955-6.js
js/src/tests/js1_8_5/regress/regress-554955-6.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:186398ea8125 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* | |
| 3 * Any copyright is dedicated to the Public Domain. | |
| 4 * http://creativecommons.org/licenses/publicdomain/ | |
| 5 */ | |
| 6 | |
| 7 var v="global"; | |
| 8 function f(a) { | |
| 9 // This eval could extend f's call object. However, the call object has | |
| 10 // not yet been marked as a delegate at this point, so no scope chain | |
| 11 // purge takes place when it is extended. | |
| 12 eval(a); | |
| 13 let (b=3) { | |
| 14 // This eval causes the cloned block object to be added to the | |
| 15 // scope chain. The block needs a unique shape: its parent call | |
| 16 // could acquire bindings for anything without affecting the global | |
| 17 // object's shape, so it's up to the block's shape to mismatch all | |
| 18 // property cache entries for prior blocks. | |
| 19 eval(""); | |
| 20 return v; | |
| 21 }; | |
| 22 } | |
| 23 | |
| 24 // Call the function once, to cache a reference to the global v from within | |
| 25 // f's lexical block. | |
| 26 assertEq("global", f("")); | |
| 27 | |
| 28 // Call the function again, adding a binding to the call, and ensure that | |
| 29 // we do not see any property cache entry created by the previous reference | |
| 30 // that would direct us to the global definition. | |
| 31 assertEq("local", f("var v='local'")); | |
| 32 | |
| 33 // Similarly,but with a doubly-nested block; make sure everyone gets marked. | |
| 34 function f2(a) { | |
| 35 eval(a); | |
| 36 let (b=3) { | |
| 37 let (c=4) { | |
| 38 eval(""); | |
| 39 return v; | |
| 40 }; | |
| 41 }; | |
| 42 } | |
| 43 | |
| 44 assertEq("global", f2("")); | |
| 45 assertEq("local", f2("var v='local'")); | |
| 46 | |
| 47 reportCompare(true, true); |
