60860 2011-05-15 16:44:26 -0700 Simplify backtracking in YARR JIT 2011-05-16 00:24:27 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 60866 1 barraclough barraclough ggaren msaboff webkit.review.bot oldest_to_newest 404221 0 barraclough 2011-05-15 16:44:26 -0700 YARR JIT currently performs a single pass of code generation over the pattern, with special handling to allow the code generation for some backtracking code out of line. We can simplify things by moving to a common mechanism whereby all forwards matching code is generated in one pass, and all backtracking code is generated in another. Backtracking code can be generated in reverse order, to optimized the common fall-through case. To make it easier to walk over the pattern, we can first convert to a more byte-code like format before JIT generating. In time we should unify this with the YARR interpreter to more closely unify the two. 404222 1 93592 barraclough 2011-05-15 16:46:56 -0700 Created attachment 93592 The patch 404223 2 webkit.review.bot 2011-05-15 16:49:44 -0700 Attachment 93592 did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/JavaScriptCore/ChangeLog', u'Source..." exit_code: 1 Source/JavaScriptCore/yarr/YarrJIT.cpp:1503: Missing space before ( in while( [whitespace/parens] [5] Source/JavaScriptCore/yarr/YarrJIT.cpp:1581: Should have only a single space after a punctuation in a comment. [whitespace/comments] [5] Source/JavaScriptCore/yarr/YarrJIT.cpp:1660: Should have only a single space after a punctuation in a comment. [whitespace/comments] [5] Source/JavaScriptCore/yarr/YarrJIT.cpp:2002: Should have only a single space after a punctuation in a comment. [whitespace/comments] [5] Source/JavaScriptCore/yarr/YarrJIT.cpp:2026: Missing space before ( in while( [whitespace/parens] [5] Source/JavaScriptCore/yarr/YarrJIT.cpp:2399: Should have only a single space after a punctuation in a comment. [whitespace/comments] [5] Total errors found: 6 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style. 404226 3 93593 barraclough 2011-05-15 17:26:28 -0700 Created attachment 93593 Layout tests for expressions fixed by the prior patch. 404252 4 barraclough 2011-05-15 19:34:07 -0700 Fixing backtracking is blocking https://bugs.webkit.org/show_bug.cgi?id=60866. 404292 5 ggaren 2011-05-15 22:38:45 -0700 Please fix style bot issues, and remove this: +// breakpoint(); 404301 6 ggaren 2011-05-15 23:04:00 -0700 There are a lot of great comments here, but also a lot of comments that describe the "what" and not the "why". I think you should remove comments that just describe the "what" (listed below). In theory, a "what" comment clutters the code, since it's redundant with what the code says. When a "what" comment does add something, that's probably a sign that the code it comments needs clearer names and abstractions. + break; // Nothing else to do! break back to the switch. + // Find the beginning of this set of alternatives. + // Check whether this set of alternatives are repeating or 'once through'. + // Update the input position. + // Link any input check failures from the prior alternative to this point. + // Calculate the difference in minimum size between the two alternatives, and + // update the input position. + // If the size of the pattern is not fixed, then we need to update the start index. + // Store the match start index, if we needed to & didn't do so above. + // If minimum size is zero, thenwe can store the current index directly. + // Increment position & check input for the first alternative - if sufficient + // input is available just to it, else jump to it's input check failure handler. + // Manage m_checked. + // Manage m_checked. + // For fixed count (always executed once) subpatterns, nothing to do here. + // Emit all alternatives, connect as a doubly linked list. + // Emit all alternatives, connect as a doubly linked list. + // If there are no repeating alternatives then emit an + // 'OpMatchFailed' to return no match. + // Run forwards over 'm_ops', generating the main matching path. + generate(); + // Run backwards over 'm_ops', generating code for backtracking. + backtrack(); 404306 7 ggaren 2011-05-15 23:19:33 -0700 + // The 'optimized' flag is used to null out the second pattern character, + // when two are fused to match a pair together. + bool m_optimized; How about "m_isDeadCode" or "m_didFuseWithPrevious" to make it more clear that this means the op can be removed because it fused with the previous op? 404312 8 93613 barraclough 2011-05-15 23:28:13 -0700 Created attachment 93613 Almost identical to the old patch, fix stylebot issues, remove 'what' comments, renamed m_optimized to m_isDeadCode, add backtrackTermDefault. Per a request over IRC by msaboff, have shared common implementations of term backtracking in backtrackTermDefault(). 404321 9 msaboff 2011-05-16 00:02:18 -0700 Comments from reviewing the first patch. Couldn't publish due to "midair" collision. View in context: https://bugs.webkit.org/attachment.cgi?id=93592&action=review > Source/JavaScriptCore/yarr/YarrJIT.cpp:354 > + // The operation, as a YarOpCode, and also a reference to the PatternTerm. Spelling of YarOpCode > Source/JavaScriptCore/yarr/YarrJIT.cpp:376 > + bool m_optimized; Too generic a name for the specific character pairing optimization. > Source/JavaScriptCore/yarr/YarrJIT.cpp:378 > + // Currentlyused in the case of some of the more complex management of Currently used > Source/JavaScriptCore/yarr/YarrJIT.cpp:384 > + // value that will be puched into the pattern's frame to return to, *pushed* > Source/JavaScriptCore/yarr/YarrJIT.cpp:390 > + // This class encapsualtes information about the state of code generation *encapsulates* > Source/JavaScriptCore/yarr/YarrJIT.cpp:642 > + YarrOp& nextOp = m_ops[opIndex + 1]; Added ASSERT(opIndex + 1 < m_ops.size()); before. > Source/JavaScriptCore/yarr/YarrJIT.cpp:1154 > + // In the case 'once through' expressions, the End node will laso have a reentry *also* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1196 > + Remove extra blank line. > Source/JavaScriptCore/yarr/YarrJIT.cpp:1200 > + ditto > Source/JavaScriptCore/yarr/YarrJIT.cpp:1231 > + // we do not need to be able to backtrack back into any alternative other than remove extra space between able & to. > Source/JavaScriptCore/yarr/YarrJIT.cpp:1280 > + // alternatives bve responsible for checking that input is available (if spelling of "bve"? > Source/JavaScriptCore/yarr/YarrJIT.cpp:1759 > + // In the case of non-simple nested assertions we nedd to also link the *need* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1782 > + // In the case of a single alterantive on its own, we don't need to *alternative* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1784 > + // continue to backtrack out of the paretheses without jumping. *parentheses* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1792 > + // If the alternative had adjusted the input possition we must link *position* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1803 > + // The last of more than one alterantives must jump back to the begnning. *alternatives* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1902 > + // If caputring, clear the capture (we only need to reset start). *capturing* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1929 > + // Check whether we should backtrack back into the paretheses, or if we *parentheses* > Source/JavaScriptCore/yarr/YarrJIT.cpp:1972 > + // We should never be backtracking to here (hence the 'terminal' in the name). remove extra space between backtracking and to 404324 10 93613 ggaren 2011-05-16 00:07:15 -0700 Comment on attachment 93613 Almost identical to the old patch, fix stylebot issues, remove 'what' comments, renamed m_optimized to m_isDeadCode, add backtrackTermDefault. r=me, modulo Michael's comments above. Would be good to come up with a fix to the o(n^2) issue soon. These YarrOps really lend themselves to a future refactoring that makes them objects with virtual generate / backtrack functions. 404331 11 barraclough 2011-05-16 00:22:23 -0700 Fixed in r86536, will follow up with an investigation of alternatives to the O(N^2) code in backtracking. 404335 12 barraclough 2011-05-16 00:24:27 -0700 (This patch got about 1 1/2 hours of regex fuzzing before landing, and has no performance impact on sunspidey / v8). 93592 2011-05-15 16:46:56 -0700 2011-05-15 23:28:13 -0700 The patch 60860.patch text/plain 168998 barraclough SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gODY1MTQpCisrKyBTb3VyY2Uv SmF2YVNjcmlwdENvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsNjcgQEAK KzIwMTEtMDUtMTUgIEdhdmluIEJhcnJhY2xvdWdoICA8YmFycmFjbG91Z2hAYXBwbGUuY29tPgor 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