js/src/jit-test/tests/basic/bug786114.js@6474c204b198 (annotated)
js/src/jit-test/tests/basic/bug786114.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | let expected = 'o!o!o!'; |
| michael@0 | 2 | let actual = ''; |
| michael@0 | 3 | |
| michael@0 | 4 | // g is a function that needs an implicit |this| if called within a |with| |
| michael@0 | 5 | // statement. If we fail to provide that implicit |this|, it will append |
| michael@0 | 6 | // "[object global]" instead of "o!". |
| michael@0 | 7 | let o = { |
| michael@0 | 8 | g: function() { actual += this.toString(); }, |
| michael@0 | 9 | toString: function() { return "o!"; } |
| michael@0 | 10 | } |
| michael@0 | 11 | |
| michael@0 | 12 | // g's presence within the |with| is detected by simple tracking of |with|s |
| michael@0 | 13 | // during parsing. |
| michael@0 | 14 | with (o) { |
| michael@0 | 15 | (function() { g(); })(); |
| michael@0 | 16 | } |
| michael@0 | 17 | |
| michael@0 | 18 | // The eval() defeats the tracking of |with| during parsing. Instead, g's |
| michael@0 | 19 | // presence within the |with| is detected by looking at the scopeChain of the |
| michael@0 | 20 | // ParseContext. |
| michael@0 | 21 | with (o) { |
| michael@0 | 22 | eval("(function() { g(); })()"); |
| michael@0 | 23 | } |
| michael@0 | 24 | |
| michael@0 | 25 | // This is like the above case, but the knowledge of the |with| presence must |
| michael@0 | 26 | // be inherited by the inner function. This is the case that was missed in bug |
| michael@0 | 27 | // 786114. |
| michael@0 | 28 | with (o) { |
| michael@0 | 29 | eval("(function() { (function() { g(); })(); })()"); |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | assertEq(actual, expected); |
