164004 2016-10-25 22:03:27 -0700 [DOMJIT] Implement Node::ownerDocument 2016-11-09 13:36:31 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 164432 162544 164006 1 ysuzuki ysuzuki cdumez commit-queue dbates esprehn+autocc fpizlo ggaren joepeck kangil.han kondapallykalyan saam sam oldest_to_newest 1244628 0 ysuzuki 2016-10-25 22:03:27 -0700 I figured out that it is called in jQuery isXMLDoc function. And it is also called from jQuery.prop() function. And it seems that this prop() is the hottest jQuery function in Ember.js SpeedoMeter. 1244629 1 ysuzuki 2016-10-25 22:05:00 -0700 Good things: Looking up the ownerDocument from the given Node is also done in CSS JIT. So there is already a function like xxxMemoryOffset(). So the difficulty is super low. And according to the inspector team, it is frequently called in the inspector. 1244742 2 292910 ysuzuki 2016-10-26 02:35:55 -0700 Created attachment 292910 Patch 1244988 3 292910 darin 2016-10-26 18:06:09 -0700 Comment on attachment 292910 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=292910&action=review > Source/WebCore/domjit/JSNodeDOMJIT.cpp:191 > +// Node#ownerDocument I don’t think these comments are helpful. The class names already contain this information. 1245011 4 292910 ysuzuki 2016-10-26 20:37:59 -0700 Comment on attachment 292910 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=292910&action=review Thanks! >> Source/WebCore/domjit/JSNodeDOMJIT.cpp:191 >> +// Node#ownerDocument > > I don’t think these comments are helpful. The class names already contain this information. Yeah, OK, I'll drop them :) 1245012 5 ysuzuki 2016-10-26 20:45:06 -0700 Committed r207932: <http://trac.webkit.org/changeset/207932> 1245178 6 ysuzuki 2016-10-27 10:59:24 -0700 jQuery.attr operation is accelerated and shows 15% improvement in Dromaeo jslib-attr-jquery's jQuery.attr(class). 1246271 7 sam 2016-10-30 14:59:21 -0700 (In reply to comment #6) > jQuery.attr operation is accelerated and shows 15% improvement in Dromaeo > jslib-attr-jquery's jQuery.attr(class). That's awesome. 1247891 8 ysuzuki 2016-11-03 15:49:40 -0700 It causes segv. rolled out. Investigating. I guess document() may become null while it is represented as a reference at some point (maybe, when leaving a page). 1247996 9 ysuzuki 2016-11-03 19:43:00 -0700 hmmmmmmm, still I cannot reproduce it on x64 environment. The crash log said that we crash with 0x8 access. It is apparently nullptr + offset access. I think the most suspicious part case is "document becomes nullptr". We access the document + ScriptWrappable::offsetOfWrapper<Document>(). And ScriptWrappable::offsetOfWrapper<Document>() is 8. If it returns nullptr, it should cause the segv with 0x8 address in this code. And C++ ownerDocument() does not cause this crash because the C++ code is looks like this. Document* document = &this->document(); return document == this ? nullptr : document; If document becomes nullptr, it does not cause any crash. It just returns nullptr. For `document == this` part, I used `branchIfNotDocumentWrapper`. But if it may becomes nullptr, we should organize the JIT code as strictly corresponding to C++ code. (And it should be easy). The problematic part is document() is Document&. 1248048 10 293865 ysuzuki 2016-11-03 22:17:19 -0700 Created attachment 293865 Patch 1248049 11 ysuzuki 2016-11-03 22:18:32 -0700 (In reply to comment #10) > Created attachment 293865 [details] > Patch Still I cannot reproduce it in x64 environment & I'm still setting up the ARM64 environment, I believe this should fix the crash. Still investigating... 1248050 12 293866 ysuzuki 2016-11-03 22:21:19 -0700 Created attachment 293866 Patch 1248076 13 ysuzuki 2016-11-04 00:09:02 -0700 Finally, I've reproduced in arm64. Investigating... 1248165 14 ysuzuki 2016-11-04 10:49:15 -0700 (In reply to comment #13) > Finally, I've reproduced in arm64. Investigating... OK, I reproduced the issue with the previous version. And I've ensured this patch fixes the issue. I'll ensure that sometimes `document()` returns nullptr next. 1248178 15 ysuzuki 2016-11-04 11:32:07 -0700 (In reply to comment #14) > (In reply to comment #13) > > Finally, I've reproduced in arm64. Investigating... > > OK, I reproduced the issue with the previous version. > And I've ensured this patch fixes the issue. > I'll ensure that sometimes `document()` returns nullptr next. I've figured out the cause of this bug. The above guess is wrong. In C++ ownerDocument() code, we have like, Document* document = &this->document(); return document == this ? nullptr : document; Instead, DOMJIT ownerDocument used DOMJIT::branchIfDocumentWrapper() to check if the given object is Document. But, interestingly, it seems that there is some objects, that nodeType embed in JSType is not DocumentWrapper, but document() == this. 1248303 16 ysuzuki 2016-11-04 15:07:28 -0700 Finally I figured out the issue. It is not directly related to this patch. MacroAssembler's bug. https://bugs.webkit.org/show_bug.cgi?id=164432 1248619 17 293866 darin 2016-11-06 10:21:53 -0800 Comment on attachment 293866 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=293866&action=review > Source/WebCore/domjit/JSNodeDOMJIT.cpp:180 > + RELEASE_ASSERT(!CAST_OFFSET(EventTarget*, Node*)); > + RELEASE_ASSERT(!CAST_OFFSET(Node*, Document*)); Can we use a static_assert here instead of RELEASE_ASSERT? > Source/WebCore/domjit/JSNodeDOMJIT.cpp:185 > + // In C++ ownerDocument implementation, if &document() becomes nullptr, it just returns nullptr. > + // DOMJIT implementation strictly follows the C++ one. > + nullCases.append(jit.branchTestPtr(CCallHelpers::Zero, document)); We need to look into this more. It is annoying that we have to add a branch for this, and even the C++ implementation would crash if we compiled it with -fcatch-undefined-behavior and the document reference was null. We should reproduce the problem, fix it, and remove this branch! 1248802 18 293866 ysuzuki 2016-11-07 11:50:07 -0800 Comment on attachment 293866 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=293866&action=review Thanks! >> Source/WebCore/domjit/JSNodeDOMJIT.cpp:185 >> + nullCases.append(jit.branchTestPtr(CCallHelpers::Zero, document)); > > We need to look into this more. It is annoying that we have to add a branch for this, and even the C++ implementation would crash if we compiled it with -fcatch-undefined-behavior and the document reference was null. We should reproduce the problem, fix it, and remove this branch! Oops! I should update this patch. Sorry. I set up my device and finally figured out the issue :D And it is not related to this patch. Our MacroAssembler in non x86 has a bug with 8bit operations (like branch8). And this is why x86 Safari does not pose any problems. See the comment in https://bugs.webkit.org/show_bug.cgi?id=164004#c16. And https://bugs.webkit.org/show_bug.cgi?id=164432 is handling this issue. Once the macro assembler issue is fixed, we can land the reverted patch as is. At that time, I'll insert assertions newly added in this patch :) 1249376 19 293866 ysuzuki 2016-11-09 11:20:05 -0800 Comment on attachment 293866 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=293866&action=review >> Source/WebCore/domjit/JSNodeDOMJIT.cpp:180 >> + RELEASE_ASSERT(!CAST_OFFSET(Node*, Document*)); > > Can we use a static_assert here instead of RELEASE_ASSERT? Because CAST_OFFSET uses reinterpret_cast, it is not used in the context of static_assert, :(. That's sad thing. (And OBJECT_OFFSETOF macro is the same). 1249453 20 293866 ysuzuki 2016-11-09 13:17:34 -0800 Comment on attachment 293866 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=293866&action=review >>> Source/WebCore/domjit/JSNodeDOMJIT.cpp:185 >>> + nullCases.append(jit.branchTestPtr(CCallHelpers::Zero, document)); >> >> We need to look into this more. It is annoying that we have to add a branch for this, and even the C++ implementation would crash if we compiled it with -fcatch-undefined-behavior and the document reference was null. We should reproduce the problem, fix it, and remove this branch! > > Oops! I should update this patch. Sorry. I set up my device and finally figured out the issue :D > And it is not related to this patch. Our MacroAssembler in non x86 has a bug with 8bit operations (like branch8). And this is why x86 Safari does not pose any problems. > See the comment in https://bugs.webkit.org/show_bug.cgi?id=164004#c16. > And https://bugs.webkit.org/show_bug.cgi?id=164432 is handling this issue. > > Once the macro assembler issue is fixed, we can land the reverted patch as is. > At that time, I'll insert assertions newly added in this patch :) So, Ive just dropped this check. The macro assembler fix should address this issue. 1249479 21 ysuzuki 2016-11-09 13:36:31 -0800 Committed r208481: <http://trac.webkit.org/changeset/208481> 292910 2016-10-26 02:35:55 -0700 2016-11-03 22:17:13 -0700 Patch bug-164004-20161026023208.patch text/plain 11800 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjA3ODY5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNGE5MGQwYTdiYWFlNjk2 MzdlMDJhOTE5OWNiOTk2NTZhNzgzYzIzMC4uMGU2MzQwMTViODNhNTNmMDllNTlkOWUzZmFiNzQ4 MzExYmE3YTdlZSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDM4IEBACisyMDE2LTEwLTI2ICBZdXN1 a2UgU3V6dWtpICA8dXRhdGFuZS50ZWFAZ21haWwuY29tPgorCisgICAgICAgIFtET01KSVRdIElt cGxlbWVudCBOb2RlOjpvd25lckRvY3VtZW50CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQu b3JnL3Nob3dfYnVnLmNnaT9pZD0xNjQwMDQKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg KE9PUFMhKS4KKworICAgICAgICBUZXN0OiBqcy9kb20vZG9taml0LWFjY2Vzc29yLW93bmVyLWRv 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