106398 2013-01-08 16:38:17 -0800 DFG shouldn't treat the 'this' argument as being captured if a code block uses arguments 2013-01-08 17:13:39 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED InRadar P2 Normal --- 1 fpizlo fpizlo barraclough ggaren mark.lam mhahnenberg msaboff oliver sam oldest_to_newest 802796 0 fpizlo 2013-01-08 16:38:17 -0800 Doing so results in two outcomes: 1) We're overly pessimistic about how we compile code that uses 'this' in inlined function calls that uses arguments. 2) We try to flush the this argument when we assign to it in create_this. Except that the this argument wouldn't have been assigned. This results in strange IR corruption, including causing the OSR entry code to try to test the values in the locals associated with the 'this' argument of inlined code - except that the 'this' argument to an inline construct is a temporary, and would not have been initialized at OSR entrypoints. This can lead to strange crashes in OSR entry. 802799 1 fpizlo 2013-01-08 16:42:11 -0800 <rdar://problem/12439776> 802800 2 181800 fpizlo 2013-01-08 16:42:30 -0800 Created attachment 181800 the patch 802828 3 181800 mhahnenberg 2013-01-08 17:04:46 -0800 Comment on attachment 181800 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=181800&action=review r=me > Source/JavaScriptCore/dfg/DFGValidate.cpp:80 > + // Validate that all local variable phis at the head of the root block are dead. No "phis". > Source/JavaScriptCore/dfg/DFGValidate.cpp:297 > + void reportValidationContext() Remove. 802833 4 fpizlo 2013-01-08 17:13:39 -0800 Landed in http://trac.webkit.org/changeset/139136 181800 2013-01-08 16:42:30 -0800 2013-01-08 17:04:45 -0800 the patch fix.patch text/plain 12235 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTM5MTMxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI4IEBA CisyMDEzLTAxLTA4ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg REZHIHNob3VsZG4ndCB0cmVhdCB0aGUgJ3RoaXMnIGFyZ3VtZW50IGFzIGJlaW5nIGNhcHR1cmVk IGlmIGEgY29kZSBibG9jayB1c2VzIGFyZ3VtZW50cworICAgICAgICBodHRwczovL2J1Z3Mud2Vi a2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTA2Mzk4CisgICAgICAgIDxyZGFyOi8vcHJvYmxlbS8x MjQzOTc3Nj4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKyAgICAgICAg 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