68746 2011-09-23 17:49:13 -0700 wtf/BitVector.h has a variety of bugs which manifest when the vector grows beyond 63 bits 2011-09-23 20:24:29 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 fpizlo webkit-unassigned fpizlo oliver webkit.review.bot oldest_to_newest 472662 0 fpizlo 2011-09-23 17:49:13 -0700 - The number of bytes that need to be malloc'd is miscomputed. - The index into the uintptr_t* is miscomputed. - resize() sometimes exits too early. - Far too much code is inline, when it could be trivially out-of-line. 472665 1 108570 fpizlo 2011-09-23 17:54:47 -0700 Created attachment 108570 the patch 472667 2 webkit.review.bot 2011-09-23 17:56:50 -0700 Attachment 108570 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/wtf/BitVector.h:143: The parameter name "outOfLineBits" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 1 in 8 files If any of these errors are false positives, please file a bug against check-webkit-style. 472670 3 108570 oliver 2011-09-23 18:00:08 -0700 Comment on attachment 108570 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=108570&action=review r=me, but it would be worth considering whether ensureSize() should be inline or outline before landing > Source/JavaScriptCore/wtf/BitVector.h:79 > - void ensureSize(size_t numBits) > - { > - if (numBits <= size()) > - return; > - resizeOutOfLine(numBits); > - } > + void ensureSize(size_t numBits); Do you really want to take ensureSize out of line? you already have resizeOutOfLine so it seems overkill to hoist the entire function out 472671 4 fpizlo 2011-09-23 18:02:36 -0700 (In reply to comment #3) > (From update of attachment 108570 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=108570&action=review > > r=me, but it would be worth considering whether ensureSize() should be inline or outline before landing > > > Source/JavaScriptCore/wtf/BitVector.h:79 > > - void ensureSize(size_t numBits) > > - { > > - if (numBits <= size()) > > - return; > > - resizeOutOfLine(numBits); > > - } > > + void ensureSize(size_t numBits); > > Do you really want to take ensureSize out of line? you already have resizeOutOfLine so it seems overkill to hoist the entire function out That's a really good point. I'll change that so that ensureSize() inlines the trivial path, and land. 472684 5 108573 fpizlo 2011-09-23 18:33:01 -0700 Created attachment 108573 the patch - fix style, review This is the patch I intend to land manually once I finish running the last batch of tests. 472685 6 fpizlo 2011-09-23 18:36:58 -0700 It appears that this is a speed-up on a few benchmarks, presumably because previously we had corrupt liveness settings and OSR would fail spuriously. I cannot find any other change in behavior, since any bugs arising from a corrupt OSR bitvector would be horribly annoying to track down. 472688 7 fpizlo 2011-09-23 19:07:22 -0700 Landed in r95895. 472706 8 108570 darin 2011-09-23 20:24:29 -0700 Comment on attachment 108570 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=108570&action=review > Source/JavaScriptCore/wtf/BitVector.cpp:38 > + (*this) = other; No need for these parentheses. > Source/JavaScriptCore/wtf/BitVector.cpp:41 > +BitVector& BitVector::operator=(const BitVector& other) It’s normally considered better style to write a swap function and a copy constructor and build the assignment operator from the copy constructor instead of the other way around. 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