223278 2021-03-16 14:06:04 -0700 DFG arity fixup nodes should exit to the caller's call opcode 2022-01-21 02:38:29 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 keith_miller keith_miller aperez ews-watchlist magomez mark.lam msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1740181 0 keith_miller 2021-03-16 14:06:04 -0700 DFG arity fixup nodes should exit to the caller's call opcode 1743001 1 webkit-bug-importer 2021-03-23 14:07:13 -0700 <rdar://problem/75754212> 1745646 2 424777 keith_miller 2021-03-31 09:19:39 -0700 Created attachment 424777 Patch 1745719 3 424777 saam 2021-03-31 12:11:24 -0700 Comment on attachment 424777 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=424777&action=review > Source/JavaScriptCore/ChangeLog:29 > + --> foo: loc10 is a local in foo. > + ... > + 1: MovHint(loc10) > + 2: SetLocal(loc10) > + <-- foo // loc10 ten is now out of scope for the InlineCallFrame of the caller. > + ... > + // Phantom will be inserted here refering to loc10, which doesn't make sense. > + --> bar // loc10 is an argument to bar and needs arity fixup. > + ... // All of these nodes are ExitInvalid > + 3: MovHint(loc10, ExitInvalid) > + 4: SetLocal(loc10, ExitInvalid) > + ... How does changing the exit origin fix this? > Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:1730 > + // In this example phantom insertion phase will think @3 is always alive because it's in the header of bar. So, > + // it will think we are about to kill the old value and thus need a Phantom. That Phantom, however, may be inserted > + // into the caller's NodeOrigin (all the nodes in bar before @3 are ExitInvalid), which doesn't know about loc10. how does setting the exit origin fix this? 1747022 4 424777 keith_miller 2021-04-05 11:16:36 -0700 Comment on attachment 424777 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=424777&action=review >> Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:1730 >> + // into the caller's NodeOrigin (all the nodes in bar before @3 are ExitInvalid), which doesn't know about loc10. > > how does setting the exit origin fix this? Since PhantomInsertionPhase asks forAllKilledOperands what locals have been killed at any given Node and loc10 is in the header of bar loc10 will go from being considered dead in the caller to alive again in the callee (and killed at @3). By setting the exit origin to the caller's frame for arity fixup loc10 will not be seen as alive into @3 anymore. I'll add this to the comment. 1747027 5 425177 keith_miller 2021-04-05 11:30:05 -0700 Created attachment 425177 Patch for landing 1747223 6 ews-feeder 2021-04-05 18:52:11 -0700 Committed r275472: <https://commits.webkit.org/r275472> All reviewed patches have been landed. Closing bug and clearing flags on attachment 425177. 424777 2021-03-31 09:19:39 -0700 2021-04-05 11:30:02 -0700 Patch bug-223278-20210331121938.patch text/plain 7898 keith_miller U3VidmVyc2lvbiBSZXZpc2lvbjogMjc0MzIzCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAy ZWVkMjMwYTFkODM0OGVkYjNkMTE1NWI5MzA4NjUwNzFkNmNlNmY0Li41ZDczMTE0MDcwZWU2MGYy MzU0ZjE1M2RkMmIzYzdhMTRmMjc2NjUzIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwzNyBAQAorMjAyMS0wMy0zMSAgS2VpdGggTWlsbGVyICA8a2VpdGhfbWlsbGVyQGFwcGxl LmNvbT4KKworICAgICAgICBERkcgYXJpdHkgZml4dXAgbm9kZXMgc2hvdWxkIGV4aXQgdG8gdGhl IGNhbGxlcidzIGNhbGwgb3Bjb2RlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD0yMjMyNzgKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMh KS4KKworICAgICAgICBSaWdodCBub3cgd2hlbiB3ZSBkbyBhcml0eSBmaXh1cCBpbiB0aGUgREZH 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