212190 2020-05-20 23:56:27 -0700 Add more Bitmap methods. 2020-05-27 11:26:58 -0700 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam benjamin cdumez cmarcelo ews-watchlist mcatanzaro rmorisset sam webkit-bug-importer oldest_to_newest 1654818 0 mark.lam 2020-05-20 23:56:27 -0700 Specifically, setEachNthBit - sets every Nth bit starting at a specified start bit operator= - assignment operator|= - bit or and assignment operator&= - bit and and assignment operator^= - bit xor and assignment 1654819 1 webkit-bug-importer 2020-05-20 23:56:56 -0700 <rdar://problem/63481333> 1654821 2 399939 mark.lam 2020-05-21 00:02:26 -0700 Created attachment 399939 proposed patch. 1654998 3 sam 2020-05-21 10:54:00 -0700 What do you plan to do with these? 1655001 4 mark.lam 2020-05-21 11:01:04 -0700 (In reply to Sam Weinig from comment #3) > What do you plan to do with these? I'm exploring implementing a MarkedBlock FreeList using Bitmap instead of a linked list of FreeCells. For that purpose, computation of which block atoms are free is done using bit math on Marked bits, NewlyAllocated bits, and some other mask. The setEachNthBit() method is needed to make the other mask. 1655018 5 399939 rmorisset 2020-05-21 11:45:46 -0700 Comment on attachment 399939 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=399939&action=review r=me, with a couple of suggestions for the tests. > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1001 > + { Is this block just the same as the one above except for s/size/smallsize/g ? If so, is it possible to make it an helper function to avoid the repetition? > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1093 > + temp.set(i, (randomNumber() > 0.5)); I am not sure that a random number in a test is a great idea. It sounds like a recipe for flakiness/non-reproducibility. > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1102 > + Bitmap<smallSize, WordType> smallTemp; Same comment as above, maybe try merging the tests for smallSize and for size with a helper function. > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1113 > + smallTemp.set(i, (randomNumber() > 0.5)); see my comment above, I think it might be nicer to bake somewhere (at the top of the file?) an array with the random-looking values, instead of drawing them truly randomly at each execution. > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1427 > + // 1 & 0 typo: & instead of ^ > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1434 > + // 1 & 1 ditto. > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1506 > + // 1 & 0 ditto. > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1513 > + // 1 & 1 ditto. 1655034 6 399939 mark.lam 2020-05-21 12:44:06 -0700 Comment on attachment 399939 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=399939&action=review >> Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1001 >> + { > > Is this block just the same as the one above except for s/size/smallsize/g ? > If so, is it possible to make it an helper function to avoid the repetition? Not identical because of the different data sets used. Also I don't have predetermined data sets for the smallSize case. So, I'm using randomNumber to generate them in some of the cases below where needed. I can look into refactoring this. >> Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:1427 >> + // 1 & 0 > > typo: & instead of ^ Thanks fixed. 1655083 7 399981 mark.lam 2020-05-21 14:36:32 -0700 Created attachment 399981 patch for landing. 1655087 8 399981 rmorisset 2020-05-21 14:43:21 -0700 Comment on attachment 399981 patch for landing. View in context: https://bugs.webkit.org/attachment.cgi?id=399981&action=review Thanks for improving the tests! > Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:29 > +#include <wtf/RandomNumber.h> No longer needed. 1655088 9 399981 mark.lam 2020-05-21 14:44:33 -0700 Comment on attachment 399981 patch for landing. View in context: https://bugs.webkit.org/attachment.cgi?id=399981&action=review >> Tools/TestWebKitAPI/Tests/WTF/Bitmap.cpp:29 >> +#include <wtf/RandomNumber.h> > > No longer needed. Will remove. 1655095 10 mark.lam 2020-05-21 15:14:11 -0700 Thanks for the reviews. Landed in r262030: <http://trac.webkit.org/r262030>. 1656438 11 mcatanzaro 2020-05-27 10:53:46 -0700 This introduced a nice GCC warning spam: In file included from DerivedSources/JavaScriptCore/unified-sources/UnifiedSource-f0a787a9-2.cpp:5: /home/mcatanzaro/Projects/WebKit/Source/JavaScriptCore/bytecode/BytecodeLivenessAnalysis.cpp:194:16: warning: implicitly-declared ‘constexpr WTF::Bitmap<4>::Bitmap(const WTF::Bitmap<4>&)’ is deprecated [-Wdeprecated-copy] 194 | return result; | ^~~~~~ because: DerivedSources/ForwardingHeaders/wtf/Bitmap.h:480:13: note: because ‘WTF::Bitmap<4>’ has user-provided ‘void WTF::Bitmap<bitmapSize, WordType>::operator=(const WTF::Bitmap<bitmapSize, WordType>&) [with long unsigned int bitmapSize = 4; WordType = unsigned int]’ 480 | inline void Bitmap<bitmapSize, WordType>::operator=(const Bitmap& other) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ To avoid the warning, we should either (a) remove the copy assignment operator, or (b) add a copy constructor. Either way would be fine, but in this case I'd prefer (a) because I don't think the new copy assignment operator is needed. It uses a loop to manually copy the bits of the sole member variable, a std::array, but a default copy of the array would be equivalent, right? 1656461 12 mcatanzaro 2020-05-27 11:26:58 -0700 (In reply to Michael Catanzaro from comment #11) > This introduced a nice GCC warning spam: Created: bug #212421 399939 2020-05-21 00:02:26 -0700 2020-05-21 14:36:32 -0700 proposed patch. bug-212190.patch text/plain 24135 mark.lam SW5kZXg6IFNvdXJjZS9XVEYvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFNvdXJjZS9XVEYvQ2hh bmdlTG9nCShyZXZpc2lvbiAyNjE5ODQpCisrKyBTb3VyY2UvV1RGL0NoYW5nZUxvZwkod29ya2lu ZyBjb3B5KQpAQCAtMSwzICsxLDIwIEBACisyMDIwLTA1LTIwICBNYXJrIExhbSAgPG1hcmsubGFt QGFwcGxlLmNvbT4KKworICAgICAgICBBZGQgbW9yZSBCaXRtYXAgbWV0aG9kcy4KKyAgICAgICAg aHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIxMjE5MAorICAgICAgICA8 cmRhcjovL3Byb2JsZW0vNjM0ODEzMzM+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChP 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