README.txt
author Nicholas Nethercote <nnethercote@mozilla.com>
Wed, 12 Jul 2017 15:13:37 +1000
changeset 368809 129793760f2d718ed61ba17d9aacd57c7ec6785b
parent 348733 40911fc4bf7eff4f84add35cceb3a67d69a6e75a
child 417348 3c5ec0ff49dc7239a6e72d311e04b047ad6d50fc
permissions -rw-r--r--
Bug 1380227 - Avoid many UTF16toUTF8 and UTF8toUTF16 conversions in nsStringBundle. r=emk. Most of the names passed to nsIStringBundle::{Get,Format}StringFromUTF8Name have one of the two following forms: - a 16-bit C string literal, which is then converted to an 8-bit string in order for the lookup to occur; - an 8-bit C string literal converted to a 16-bit string, which is then converted back to an 8-bit string in order for the lookup to occur. This patch introduces and uses alternative methods that can take an 8-bit C string literal, which requires changing some signatures in other methods and functions. It replaces all C++ uses of the old methods. The patch also changes the existing {Get,Format}StringFromName() methods so they take an AUTF8String argument for the name instead of a wstring, because that's nicer for JS code. Even though there is a method for C++ code and a different one for JS code, |binaryname| is used so that the existing method names can be used for the common case in both languages. The change reduces the number of NS_ConvertUTF8toUTF16 and NS_ConvertUTF16toUTF8 conversions while running Speedometer v2 from ~270,000 to ~160,000. (Most of these conversions involved the string "deprecatedReferrerDirective" in nsCSPParser.cpp.)

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