159233 2016-06-28 16:03:33 -0700 REGRESSION (r200946): Improper backtracking from last alternative in sticky patterns 2016-06-28 17:39:18 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 msaboff msaboff commit-queue keith_miller mark.lam saam oldest_to_newest 1206205 0 msaboff 2016-06-28 16:03:33 -0700 Various sticky patterns fail in unexpected ways when the last alternative doesn't match. It seems that we retry with an index that isn't correct. This manifests itself in a couple different ways. The expression 's = ”\n”.split(/.{2}|(?=$)./ym)' will crash in JIT'ed code, while the expression 'let m = ".a".match(/x(.)|[-\d]/gy")' will ASSERT in debug builds: #0 0x106b8ccb8 in WTFCrash (JavaScriptCore+0x2a87cb8) #1 0x1066e889a in JSC::JSRopeString::finishCreationSubstringOfResolved(JSC::VM&, JSC::JSString*, unsigned int, unsigned int) (JavaScriptCore+0x25e389a) #2 0x1066e8176 in JSC::JSRopeString::createSubstringOfResolved(JSC::VM&, JSC::JSString*, unsigned int, unsigned int) (JavaScriptCore+0x25e3176) #3 0x1066fa423 in JSC::JSValue JSC::collectMatches<JSC::RegExpObject::matchGlobal(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSString*)::$_1>(JSC::VM&, JSC::ExecState*, JSC::JSString*, WTF::String const&, JSC::RegExpConstructor*, JSC::RegExp*, JSC::RegExpObject::matchGlobal(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSString*)::$_1 const&)::'lambda'()::operator()() const (JavaScriptCore+0x25f5423) #4 0x1066f89b3 in JSC::JSValue JSC::collectMatches<JSC::RegExpObject::matchGlobal(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSString*)::$_1>(JSC::VM&, JSC::ExecState*, JSC::JSString*, WTF::String const&, JSC::RegExpConstructor*, JSC::RegExp*, JSC::RegExpObject::matchGlobal(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSString*)::$_1 const&) (JavaScriptCore+0x25f39b3) #5 0x1066f6c90 in JSC::RegExpObject::matchGlobal(JSC::ExecState*, JSC::JSGlobalObject*, JSC::JSString*) (JavaScriptCore+0x25f1c90) 1206207 1 msaboff 2016-06-28 16:04:12 -0700 <rdar://problem/27008975> <rdar://problem/27018880> 1206215 2 282295 msaboff 2016-06-28 16:24:44 -0700 Created attachment 282295 Patch 1206216 3 commit-queue 2016-06-28 16:26:27 -0700 Attachment 282295 did not pass style-queue: ERROR: Source/JavaScriptCore/yarr/YarrJIT.cpp:1848: Multi line control clauses should use braces. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/yarr/YarrJIT.cpp:1851: Missing space before { [whitespace/braces] [5] Total errors found: 2 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style. 1206217 4 282295 mark.lam 2016-06-28 16:28:09 -0700 Comment on attachment 282295 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=282295&action=review Got tests? > Source/JavaScriptCore/yarr/YarrJIT.cpp:1851 > + else if (m_pattern.sticky() && m_ops[op.m_nextOp].m_op == OpBodyAlternativeEnd) > + // It is a sticky pattern and the last alternative failed, jump to the end. > + m_backtrackingState.takeBacktracksToJumpList(lastStickyAlternativeFailures, this); > + else{ Please fix style errors. 1206220 5 282297 msaboff 2016-06-28 16:32:40 -0700 Created attachment 282297 With style fixes and updated tests 1206221 6 282297 mark.lam 2016-06-28 16:34:13 -0700 Comment on attachment 282297 With style fixes and updated tests r=me 1206240 7 msaboff 2016-06-28 17:39:18 -0700 Committed r202597: <http://trac.webkit.org/changeset/202597> 282295 2016-06-28 16:24:44 -0700 2016-06-28 16:32:40 -0700 Patch 159233.patch text/plain 3188 msaboff SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjAyNTk0KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE1IEBA CisyMDE2LTA2LTI4ICBNaWNoYWVsIFNhYm9mZiAgPG1zYWJvZmZAYXBwbGUuY29tPgorCisgICAg ICAgIFJFR1JFU1NJT04gKHIyMDA5NDYpOiBJbXByb3BlciBiYWNrdHJhY2tpbmcgZnJvbSBsYXN0 IGFsdGVybmF0aXZlIGluIHN0aWNreSBwYXR0ZXJucworICAgICAgICBodHRwczovL2J1Z3Mud2Vi a2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTU5MjMzCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9C T0RZIChPT1BTISkuCisKKyAgICAgICAgSnVtcCB0byBmYWlsIGV4aXQgY29kZSB3aGVuIHRoZSBs YXN0IGFsdGVybmF0aXZlIG9mIGEgc3RpY2t5IHBhdHRlcm4gZmFpbHMuCisKKyAgICAgICAgKiB5 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