232962 2021-11-10 12:21:21 -0800 Add WTF::String::utf8Length and use it to allocate correct size buffer when converting to UTF-8 2021-11-29 20:56:43 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 achristensen achristensen ap benjamin cdumez cmarcelo darin ews-watchlist keith_miller mark.lam msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1813748 0 achristensen 2021-11-10 12:21:21 -0800 Add WTF::String::utf8Length and use it to allocate correct size buffer when converting to UTF-8 1813750 1 443845 achristensen 2021-11-10 12:22:39 -0800 Created attachment 443845 Patch 1813756 2 443848 achristensen 2021-11-10 12:32:10 -0800 Created attachment 443848 Patch 1813790 3 443848 darin 2021-11-10 14:10:24 -0800 Comment on attachment 443848 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=443848&action=review > Source/JavaScriptCore/ChangeLog:3 > + Add WTF::String::utf8Length and use it to allocate correct size buffer when converting to UTF-8 Is scanning the characters twice to compute the length and then convert better for performance? Did you measure? > Source/WTF/wtf/unicode/UTF8Conversion.cpp:46 > + uint8_t buffer[U8_MAX_LENGTH]; > + int32_t i = 0; > + // All 256 possible code points are valid, and the buffer is always big enough, > + // so it's safe to use U8_APPEND_UNSAFE. > + U8_APPEND_UNSAFE(buffer, i, *source); > + length += i; Why use U8_APPEND_UNSAFE instead of U8_LENGTH? > Source/WTF/wtf/unicode/UTF8Conversion.cpp:75 > + const UChar* source = sourceStart; > + while (source < sourceEnd) { Going with the flow of the U16_NEXT macro, we would use sourceStart and j, and not need a source pointer. > Source/WTF/wtf/unicode/UTF8Conversion.cpp:78 > + U16_NEXT(source, j, sourceEnd - source, ch); Is this fast enough? Should we make a faster version for when there are no surrogates at all? > Source/WTF/wtf/unicode/UTF8Conversion.cpp:93 > + // We already checked that ch is a valid code point, and the buffer is always big enough, > + // so it's safe to use U8_APPEND_UNSAFE. > + uint8_t buffer[U8_MAX_LENGTH]; > + int32_t i = 0; > + U8_APPEND_UNSAFE(buffer, i, ch); > + length += i; Why use U8_APPEND_UNSAFE instead of U8_LENGTH? > Source/WTF/wtf/unicode/UTF8Conversion.h:35 > ConversionOK, // conversion successful I’d rename this to just "OK" or "Success" when making this an enum class. Conversion::Conversion is inelegant. > Source/WTF/wtf/unicode/UTF8Conversion.h:50 > +WTF_EXPORT_PRIVATE size_t latin1ToUTF8Length(const LChar* sourceStart, const LChar* sourceEnd); I don’t totally love this name, and it’s not quite as nice about the other names in this header. Maybe I would call it something closer to lengthLatin1AsUTF8 or lengthUTF8FromLatin1. I like having length be the first word. > Source/WTF/wtf/unicode/UTF8Conversion.h:52 > +WTF_EXPORT_PRIVATE size_t utf16ToUTF8Length(const UChar* sourceStart, const UChar* sourceEnd, bool strict = true); And lengthUTF8FromUTF16 maybe? 1813803 4 443867 achristensen 2021-11-10 14:42:33 -0800 Created attachment 443867 Patch 1813804 5 achristensen 2021-11-10 14:44:11 -0800 (didn't respond to feedback yet, just trying to get it to compile and not crash) 1813818 6 443867 achristensen 2021-11-10 15:33:46 -0800 Comment on attachment 443867 Patch Also needs MUCH better tests. Will do later 1813821 7 achristensen 2021-11-10 15:47:15 -0800 (In reply to Darin Adler from comment #3) > Comment on attachment 443848 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=443848&action=review > > > Source/JavaScriptCore/ChangeLog:3 > > + Add WTF::String::utf8Length and use it to allocate correct size buffer when converting to UTF-8 > > Is scanning the characters twice to compute the length and then convert > better for performance? Did you measure? Operations needed to UTF-8 encode a string before this patch: 1. Read each character 2. Encode each character 3. Write each converted character 4. memcpy (another read and write) converted characters to another buffer Allocations: 1 or 2 After this patch: 1. Read each character 2. Encode each character 3. Read each character 4. Encode each character again 5. Write each converted character Allocations: 1 I'm definitely planning to measure the performance of long/short/ascii/latin1/utf16 strings on different chips to be sure, but depending on the ratio of memcpy speed to encoding speed and allocation speed I think this may be a win in most cases. There is definitely always one fewer write operation per character after this change. 1813828 8 darin 2021-11-10 15:59:09 -0800 (In reply to Alex Christensen from comment #7) > I'm definitely planning to measure the performance of > long/short/ascii/latin1/utf16 strings on different chips to be sure, but > depending on the ratio of memcpy speed to encoding speed and allocation > speed I think this may be a win in most cases. Makes sense. If we were always doing an allocation, then I’m sure this would be a win because fastMalloc/free is quite costly. Not as sure for smaller strings where we don’t do any extra allocation. I hope it’s always faster. 1816053 9 webkit-bug-importer 2021-11-17 12:22:21 -0800 <rdar://problem/85515842> 1818514 10 445357 achristensen 2021-11-29 15:45:27 -0800 Created attachment 445357 Patch 1818593 11 achristensen 2021-11-29 20:56:43 -0800 Performance measurements indicate that this is a performance regression. It's hard to beat memcpy. I broke out the code cleanup and a slight optimization into https://bugs.webkit.org/show_bug.cgi?id=233612 I'll use this bug to add String::utf8Length but not use it in String::utf8 once that's landed. 443845 2021-11-10 12:22:39 -0800 2021-11-10 12:34:09 -0800 Patch bug-232962-20211110122239.patch text/plain 21040 achristensen U3VidmVyc2lvbiBSZXZpc2lvbjogMjg1NTg4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IDFhNGE1NTdlZjZjNDUwMmNlMjY5NTJi MzVmOWM1MDBiN2FjNzQyNjAuLjE3MzdmODIwZjlkNjk0Y2NkMTYyN2U5OWI2Y2YxMDkyMTY2NzIw OGYgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsMzMgQEAKKzIwMjEtMTEtMTAgIEFsZXggQ2hyaXN0ZW5zZW4gIDxh Y2hyaXN0ZW5zZW5Ad2Via2l0Lm9yZz4KKworICAgICAgICBBZGQgV1RGOjpTdHJpbmc6OnV0ZjhM ZW5ndGggYW5kIHVzZSBpdCB0byBhbGxvY2F0ZSBjb3JyZWN0IHNpemUgYnVmZmVyIHdoZW4gY29u dmVydGluZyB0byBVVEYtOAorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 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