200921 2019-08-20 08:38:20 -0700 Variadic StringBuilder::append does not handle upconverting from 8-bit to 16-bit correctly 2019-08-23 11:00:19 -0700 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build All All RESOLVED FIXED InRadar P1 Normal --- 200862 1 darin darin benjamin cdumez cmarcelo commit-queue dbates ews-watchlist saam sam webkit-bug-importer oldest_to_newest 1563064 0 darin 2019-08-20 08:38:20 -0700 Variadic StringBuilder::append does not handle upconverting from 8-bit to 16-bit correctly 1563068 1 376771 darin 2019-08-20 08:45:49 -0700 Created attachment 376771 Patch 1563083 2 376771 saam 2019-08-20 09:11:11 -0700 Comment on attachment 376771 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376771&action=review > Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:170 > + builder.append(String("A"), "B", bullseye, ""); Do we want to expect !is8Bit() after here? (Same with other tests.) 1563084 3 376771 saam 2019-08-20 09:19:14 -0700 Comment on attachment 376771 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376771&action=review r=me with a couple comments > Source/WTF/wtf/text/StringBuilder.cpp:275 > +UChar* StringBuilder::appendUninitialized16(CheckedInt32 requiredLength) I’m not a fan of these functions names since they don’t actually append. What does the “uninitialized” refer to here? Maybe we should have a prefix like “bufferFor...”? 1563089 4 376771 darin 2019-08-20 09:26:11 -0700 Comment on attachment 376771 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376771&action=review Thanks for the review and the comments. I’m going to land as-is but might follow up later on the comments. >> Source/WTF/wtf/text/StringBuilder.cpp:275 >> +UChar* StringBuilder::appendUninitialized16(CheckedInt32 requiredLength) > > I’m not a fan of these functions names since they don’t actually append. > > What does the “uninitialized” refer to here? > > Maybe we should have a prefix like “bufferFor...”? The concept of this family of 5 private functions is that they append runs of "uninitialized characters", multiple LChar/UChar that need to be written to. The caller gets a pointer to the newly appended characters and must initialize them. The analogy is to the String::createUninitialized and StringImpl::createUninitialized functions. I am open to renaming the family of functions; note that this patch only touches 2 of the 5. I don’t think these should be named "append buffer for uninitialized", but I do think we could come up with a name that’s an improvement. >> Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:170 >> + builder.append(String("A"), "B", bullseye, ""); > > Do we want to expect !is8Bit() after here? (Same with other tests.) I don’t think that is all that helpful. The final check below will check that the string has the correct contents, and that not be possible if it was still 8-bit. The checks that I did add are necessary to make sure that the test is actually testing what it purports to test. 1563106 5 darin 2019-08-20 09:58:24 -0700 May be a good name is “extend buffer for appending“? 1563115 6 376771 commit-queue 2019-08-20 10:14:43 -0700 Comment on attachment 376771 Patch Clearing flags on attachment: 376771 Committed r248903: <https://trac.webkit.org/changeset/248903> 1563116 7 commit-queue 2019-08-20 10:14:45 -0700 All reviewed patches have been landed. Closing bug. 1563117 8 webkit-bug-importer 2019-08-20 10:15:20 -0700 <rdar://problem/54516677> 1563127 9 darin 2019-08-20 10:26:36 -0700 Oops looks like that JSC failure is real and this needs to be rolled out. Sorry! 1563129 10 darin 2019-08-20 10:31:24 -0700 Unless someone (Sam, Saam) knows how to fix it and we can roll forward instead. Sadly I can’t work on it during the day today. 1563182 11 saam 2019-08-20 12:23:24 -0700 (In reply to Darin Adler from comment #10) > Unless someone (Sam, Saam) knows how to fix it and we can roll forward > instead. Sadly I can’t work on it during the day today. I can take a look. Going to kick off a build now. 1563185 12 376771 saam 2019-08-20 12:32:42 -0700 Comment on attachment 376771 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376771&action=review > Source/WTF/wtf/text/StringBuilder.cpp:-304 > - if (!length || hasOverflowed()) maybe this was not ok to remove? 1563189 13 376771 saam 2019-08-20 12:38:06 -0700 Comment on attachment 376771 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376771&action=review >>> Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:170 >>> + builder.append(String("A"), "B", bullseye, ""); >> >> Do we want to expect !is8Bit() after here? (Same with other tests.) > > I don’t think that is all that helpful. The final check below will check that the string has the correct contents, and that not be possible if it was still 8-bit. The checks that I did add are necessary to make sure that the test is actually testing what it purports to test. I don't think it's critical, but I think it's nice when reading testing code like this that all the expectations are explicitly checked, even if they may be redundant. I like to read testing code which asserts that all the invariants are held explicitly. 1563192 14 376771 saam 2019-08-20 12:42:19 -0700 Comment on attachment 376771 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=376771&action=review >> Source/WTF/wtf/text/StringBuilder.cpp:-304 >> - if (!length || hasOverflowed()) > > maybe this was not ok to remove? Yeah, these two "hasOverflowed()" checks were not valid to remove. I haven't dug into why, but I'll revert their removal. 1563199 15 saam 2019-08-20 12:46:04 -0700 landed JSC tests fix in: https://trac.webkit.org/changeset/248913/webkit 1563200 16 saam 2019-08-20 12:46:16 -0700 (In reply to Darin Adler from comment #5) > May be a good name is “extend buffer for appending“? I like this name more. 1563519 17 darin 2019-08-21 09:33:51 -0700 Thanks for your help, Saam. I'll follow up on the naming changes. 1564509 18 darin 2019-08-23 11:00:19 -0700 (In reply to Saam Barati from comment #13) > I don't think it's critical, but I think it's nice when reading testing code > like this that all the expectations are explicitly checked, even if they may > be redundant. I like to read testing code which asserts that all the > invariants are held explicitly. I’ll consider that, but I’m not convinced it would make the tests better. It would make them brittle to changes that are observable that are not important, and there are many invariants we could assert on the string builder before and after each operation. 376771 2019-08-20 08:45:49 -0700 2019-08-20 10:14:43 -0700 Patch bug-200921-20190820084545.patch text/plain 26163 darin U3VidmVyc2lvbiBSZXZpc2lvbjogMjQ4ODk5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IDM1NDA0NTQ1ZGQ2ZGIyM2IxZTEzM2Ey NDRlNWU5MWQ0N2E5Yjk2YTYuLjkxM2Y2ZTBjMzI4NWIzMmQ5YzliN2QzMjhkMTVhNWQ3OGM0ZTZj MTkgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsMjkgQEAKKzIwMTktMDgtMjAgIERhcmluIEFkbGVyICA8ZGFyaW5A YXBwbGUuY29tPgorCisgICAgICAgIFZhcmlhZGljIFN0cmluZ0J1aWxkZXI6OmFwcGVuZCBkb2Vz IG5vdCBoYW5kbGUgdXBjb252ZXJ0aW5nIGZyb20gOC1iaXQgdG8gMTYtYml0IGNvcnJlY3RseQor ICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjAwOTIxCisK KyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgKiB3dGYvdGV4 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