js/src/jit-test/tests/debug/Frame-arguments-06.js@6474c204b198 (annotated)
js/src/jit-test/tests/debug/Frame-arguments-06.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 | // Test extracting frame.arguments element getters and calling them in |
| michael@0 | 2 | // various awkward ways. |
| michael@0 | 3 | |
| michael@0 | 4 | load(libdir + "asserts.js"); |
| michael@0 | 5 | |
| michael@0 | 6 | var g = newGlobal(); |
| michael@0 | 7 | var dbg = Debugger(g); |
| michael@0 | 8 | var hits = 0; |
| michael@0 | 9 | var fframe, farguments, fgetter; |
| michael@0 | 10 | dbg.onDebuggerStatement = function (frame) { |
| michael@0 | 11 | if (hits === 0) { |
| michael@0 | 12 | fframe = frame; |
| michael@0 | 13 | farguments = frame.arguments; |
| michael@0 | 14 | fgetter = Object.getOwnPropertyDescriptor(farguments, "0").get; |
| michael@0 | 15 | assertEq(fgetter instanceof Function, true); |
| michael@0 | 16 | |
| michael@0 | 17 | // Calling the getter without an appropriate this-object |
| michael@0 | 18 | // fails, but shouldn't assert or crash. |
| michael@0 | 19 | assertThrowsInstanceOf(function () { fgetter.call(Math); }, TypeError); |
| michael@0 | 20 | } else { |
| michael@0 | 21 | // Since fframe is still on the stack, fgetter can be applied to it. |
| michael@0 | 22 | assertEq(fframe.live, true); |
| michael@0 | 23 | assertEq(fgetter.call(farguments), 100); |
| michael@0 | 24 | |
| michael@0 | 25 | // Since h was called without arguments, there is no argument 0. |
| michael@0 | 26 | assertEq(fgetter.call(frame.arguments), undefined); |
| michael@0 | 27 | } |
| michael@0 | 28 | hits++; |
| michael@0 | 29 | }; |
| michael@0 | 30 | |
| michael@0 | 31 | g.eval("function h() { debugger; }"); |
| michael@0 | 32 | g.eval("function f(x) { debugger; h(); }"); |
| michael@0 | 33 | g.f(100); |
| michael@0 | 34 | assertEq(hits, 2); |
| michael@0 | 35 | |
| michael@0 | 36 | // Now that fframe is no longer live, trying to get its arguments should throw. |
| michael@0 | 37 | assertEq(fframe.live, false); |
| michael@0 | 38 | assertThrowsInstanceOf(function () { fgetter.call(farguments); }, Error); |
