233481 2021-11-24 14:00:08 -0800 SharedBufferChunkReader should be refactored 2021-11-25 21:04:39 -0800 1 1 1 Unclassified WebKit Platform Other Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=170956 InRadar P2 Normal --- 233030 1 jean-yves.avenard jean-yves.avenard annulen ews-watchlist gyuyoung.kim heycam ryuan.choi sergio webkit-bug-importer oldest_to_newest 1817704 0 jean-yves.avenard 2021-11-24 14:00:08 -0800 SharedBufferChunkReader is used to read the content of a SharedBuffer into a Vector. It flattens the SharedBuffer which is inefficient. It was first noted in bug 170956 that it should be rewritten and use the SharedBuffer's iterator instead. Following bug 233030 where SharedBuffer are no longer mutable ; it required the SharedBufferChunkReader to keep a strong ref to a ContiguousSharedBuffer which would increase total memory use. 1817705 1 webkit-bug-importer 2021-11-24 14:00:54 -0800 <rdar://problem/85733358> 1817865 2 jean-yves.avenard 2021-11-25 17:19:13 -0800 this task would allow for bug 233030 to be a tad smaller and is enough to do 1817870 3 445164 jean-yves.avenard 2021-11-25 17:44:02 -0800 Created attachment 445164 Patch 1817874 4 445164 heycam 2021-11-25 19:22:05 -0800 Comment on attachment 445164 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=445164&action=review > Source/WebCore/ChangeLog:10 > + SharedBufferChunkReader required the SharedBuffer to be flatten which > + would mutate the underlying SharedBuffer. "to be flattened" But I'd rewrite this to describe the change being made, e.g.: Avoid flattening a SharedBuffer when reading reading it through SharedBufferChunkReader. And maybe this can be the top line of the ChangeLog in place of "Rewrite SharedBufferChunkReader", which is a bit non-specific. > Source/WebCore/ChangeLog:11 > + the peek method was also incorrect if the data read overlapped multiple Similarly change this to describe the change being made: Fix a bug in the peek method where too many characters would be read if the requested size overlaps multiple segments. > Source/WebCore/ChangeLog:17 > + We add it to makefiles and export the header so that API tests can be written. (Probably doesn't need to be mentioned.) > Source/WebCore/platform/SharedBuffer.cpp:307 > + size_t segmentLength = std::min(currentSegment->segment->size(), remaining); > + data.append(currentSegment->segment->data(), segmentLength); "segmentLength" sounds like the length of the segment, but I don't immediately have a better suggestion. > Source/WebCore/platform/SharedBufferChunkReader.cpp:78 > auto currentCharacter = m_segment[m_segmentIndex++]; > if (currentCharacter != m_separator[m_separatorIndex]) { > if (m_separatorIndex > 0) { The existing code to check for separators doesn't work correctly with arbitrary separator strings. Not sure if it matters. But for example if the buffer contains "aaab" and the separator string is "aab", then it won't detect it as a separator, since at m_segmentIndex = 2, it'll detect a mismatch, and reset m_segmentIndex to 0. Leave a FIXME in here? > Source/WebCore/platform/SharedBufferChunkReader.cpp:98 > + if (++m_iteratorCurrent == m_iteratorEnd) { > m_reachedEndOfFile = true; Maybe set m_segment to nullptr just to be clean in here. > Source/WebCore/platform/SharedBufferChunkReader.cpp:137 > if (segmentLength > requestedSize) > segmentLength = requestedSize; Replace this with a std::min, since that's what we do elsewhere? > Source/WebCore/platform/SharedBufferChunkReader.h:63 > + const size_t m_bufferSize { 0 }; Can drop the initializer since both constructors initialize this. (And since it's const, the compiler will complain if a constructor stops initializing it.) > Source/WebCore/platform/SharedBufferChunkReader.h:66 > + bool m_reachedEndOfFile { false }; I think we can get rid of m_reachedEndOfFile, and check `m_iteratorCurrent != m_iteratorEnd` instead. (In a private helper function, if you like.) > Tools/TestWebKitAPI/Tests/WebCore/SharedBuffer.cpp:237 > + const char* const simpleText = "This is a stupid test."; s/stupid/simple/ if you want to be more positive. :-) 1817877 5 445166 jean-yves.avenard 2021-11-25 20:09:20 -0800 Created attachment 445166 Patch Apply comment 1817879 6 ews-feeder 2021-11-25 21:04:36 -0800 Committed r286171 (244554@main): <https://commits.webkit.org/244554@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 445166. 445164 2021-11-25 17:44:02 -0800 2021-11-25 20:09:15 -0800 Patch bug-233481-20211126124401.patch text/plain 31911 jean-yves.avenard U3VidmVyc2lvbiBSZXZpc2lvbjogMjg2MTI2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggN2Y4MWQ1Mjg0MTUwMDQ5 MDVmNmQ1YWM1NTZiZTAyMDQzYjA1MjI5YS4uYzFkZDdlNmVkMDVkNWJlNGVjZmYzODJjNTQzMDM0 MzAwZjVjYmQ2MiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDM2IEBACisyMDIxLTExLTI1ICBKZWFu LVl2ZXMgQXZlbmFyZCAgPGp5YUBhcHBsZS5jb20+CisKKyAgICAgICAgUmV3cml0ZSBTaGFyZWRC dWZmZXJDaHVua1JlYWRlcgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 Zy5jZ2k/aWQ9MjMzNDgxCisgICAgICAgIHJkYXI6Ly9wcm9ibGVtLzg1NzMzMzU4CisKKyAgICAg ICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgU2hhcmVkQnVmZmVyQ2h1 bmtSZWFkZXIgcmVxdWlyZWQgdGhlIFNoYXJlZEJ1ZmZlciB0byBiZSBmbGF0dGVuIHdoaWNoCisg 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