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comparison: js/src/jit-test/tests/debug/Frame-arguments-06.js
js/src/jit-test/tests/debug/Frame-arguments-06.js
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:6b0a0287f3ec |
|---|---|
| 1 // Test extracting frame.arguments element getters and calling them in | |
| 2 // various awkward ways. | |
| 3 | |
| 4 load(libdir + "asserts.js"); | |
| 5 | |
| 6 var g = newGlobal(); | |
| 7 var dbg = Debugger(g); | |
| 8 var hits = 0; | |
| 9 var fframe, farguments, fgetter; | |
| 10 dbg.onDebuggerStatement = function (frame) { | |
| 11 if (hits === 0) { | |
| 12 fframe = frame; | |
| 13 farguments = frame.arguments; | |
| 14 fgetter = Object.getOwnPropertyDescriptor(farguments, "0").get; | |
| 15 assertEq(fgetter instanceof Function, true); | |
| 16 | |
| 17 // Calling the getter without an appropriate this-object | |
| 18 // fails, but shouldn't assert or crash. | |
| 19 assertThrowsInstanceOf(function () { fgetter.call(Math); }, TypeError); | |
| 20 } else { | |
| 21 // Since fframe is still on the stack, fgetter can be applied to it. | |
| 22 assertEq(fframe.live, true); | |
| 23 assertEq(fgetter.call(farguments), 100); | |
| 24 | |
| 25 // Since h was called without arguments, there is no argument 0. | |
| 26 assertEq(fgetter.call(frame.arguments), undefined); | |
| 27 } | |
| 28 hits++; | |
| 29 }; | |
| 30 | |
| 31 g.eval("function h() { debugger; }"); | |
| 32 g.eval("function f(x) { debugger; h(); }"); | |
| 33 g.f(100); | |
| 34 assertEq(hits, 2); | |
| 35 | |
| 36 // Now that fframe is no longer live, trying to get its arguments should throw. | |
| 37 assertEq(fframe.live, false); | |
| 38 assertThrowsInstanceOf(function () { fgetter.call(farguments); }, Error); |
