210317 2020-04-09 20:22:47 -0700 The rhs in `ReadModifyResolveNode` should be evaluated before throwing an exception if the lhs is read-only 2020-04-13 12:42:13 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 hi hi ews-watchlist hi joepeck keith_miller mark.lam msaboff rmorisset ross.kirsling saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1640006 0 hi 2020-04-09 20:22:47 -0700 ``` (function() { let count = 0; const x = 42; try { x += (() => ++count)(); } catch { } if (count !== 1) throw new Error(`expected 1 but got ${count}`); })(); ``` See NOTE 2 on <https://tc39.es/proposal-logical-assignment/#sec-assignment-operators-runtime-semantics-evaluation>. 1640007 1 396038 hi 2020-04-09 20:26:25 -0700 Created attachment 396038 Patch 1640022 2 396038 joepeck 2020-04-09 21:12:13 -0700 Comment on attachment 396038 Patch Does this cause a test262 test to change, or maybe not one we have imported? 1640027 3 396038 ross.kirsling 2020-04-09 21:34:12 -0700 Comment on attachment 396038 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=396038&action=review > JSTests/stress/const-read-modify-assignment-eval-rhs-before-exception.js:24 > + try { > + testConstReadModifyAssignmentRHSEvalBeforeException += (() => ++count)(); > + } catch { } I'm a bit worried about the fact that this test doesn't fail before your patch. I spent a good while playing and I'm honestly not sure how to hit the `!var.local() && var.isReadOnly()` path in ReadModifyResolveNode (or AssignResolveNode). (Tried top-level const, non-configurable non-writable global var, freezing the global object and then trying to set a global var in strict mode...these all lack `var.local()`, but none satisfy `var.isReadOnly()`.) 1640071 4 ross.kirsling 2020-04-10 01:12:09 -0700 Alright, so here is a test that hits the non-local read-only path, fails before your patch, and succeeds with it: (function () { let count = 0; const x = 42; function captureX() { return x; } try { x -= (() => count++)(); } catch { if (count === 1) return; } throw new Error('failed!'); })(); I...actually don't understand why. I just adapted it from here: https://github.com/WebKit/webkit/blob/master/JSTests/stress/const-semantics.js#L125-L129 1640240 5 hi 2020-04-10 10:17:23 -0700 (In reply to Ross Kirsling from comment #4) > Alright, so here is a test that hits the non-local read-only path, fails before your patch, and succeeds with it: > > (function () { > let count = 0; > > const x = 42; > function captureX() { return x; } > > try { > x -= (() => count++)(); > } catch { > if (count === 1) > return; > } > throw new Error('failed!'); > })(); > > > I...actually don't understand why. I just adapted it from here: https://github.com/WebKit/webkit/blob/master/JSTests/stress/const-semantics.js#L125-L129 (o.0) funky stuff :P Thanks for the help! :) 1640243 6 396098 hi 2020-04-10 10:23:15 -0700 Created attachment 396098 Patch 1640259 7 396098 ross.kirsling 2020-04-10 10:45:53 -0700 Comment on attachment 396098 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=396098&action=review r=me > JSTests/stress/const-read-modify-assignment-eval-rhs-before-exception.js:27 > +Object.defineProperty(globalThis, "testConstReadModifyAssignmentRHSEvalBeforeException", { Hmm, if you don't remove this test you should probably at least change the property name, since it's a `!var.local() && !var.isReadOnly()` red herring. 1640358 8 396098 hi 2020-04-10 14:15:15 -0700 Comment on attachment 396098 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=396098&action=review >> JSTests/stress/const-read-modify-assignment-eval-rhs-before-exception.js:27 >> +Object.defineProperty(globalThis, "testConstReadModifyAssignmentRHSEvalBeforeException", { > > Hmm, if you don't remove this test you should probably at least change the property name, since it's a `!var.local() && !var.isReadOnly()` red herring. I'll just remove it :) 1640359 9 396121 hi 2020-04-10 14:16:15 -0700 Created attachment 396121 Patch 1640378 10 ews-feeder 2020-04-10 14:50:15 -0700 Committed r259905: <https://trac.webkit.org/changeset/259905> All reviewed patches have been landed. Closing bug and clearing flags on attachment 396121. 1640379 11 webkit-bug-importer 2020-04-10 14:51:17 -0700 <rdar://problem/61605729> 1640799 12 saam 2020-04-13 01:03:43 -0700 (In reply to Ross Kirsling from comment #4) > Alright, so here is a test that hits the non-local read-only path, fails > before your patch, and succeeds with it: > > (function () { > let count = 0; > > const x = 42; > function captureX() { return x; } > > try { > x -= (() => count++)(); > } catch { > if (count === 1) > return; > } > throw new Error('failed!'); > })(); > > > I...actually don't understand why. I just adapted it from here: > https://github.com/WebKit/webkit/blob/master/JSTests/stress/const-semantics. > js#L125-L129 This makes sense. !!.local() means it wasn’t captured. So it lives in a bytecode local for this function that’s being compiled. If .local() is false, it’s captured 1641042 13 ross.kirsling 2020-04-13 12:42:13 -0700 (In reply to Saam Barati from comment #12) > This makes sense. !!.local() means it wasn’t captured. So it lives in a > bytecode local for this function that’s being compiled. If .local() is > false, it’s captured Ahh, that's clear then, thanks! 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