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Introduce a new non-heap-allocated type for holding nsStringBuffer* in the HTML parser.

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An innerHTML setter profile shows about 10% of the time being spent under nsHtml5HtmlAttributes::clear, mostly deleting nsStrings.
This commit is contained in:
win7-7 2019-07-05 21:58:21 +03:00 • committed by Roy Tam
commit 1be77e0f3f
34 changed files with 719 additions and 358 deletions
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7
parser/html/nsHtml5StreamParser.cpp
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@ -1261,7 +1261,7 @@ nsHtml5StreamParser::PreferredForInternalEncodingDecl(nsACString& aEncoding)
}
bool
nsHtml5StreamParser::internalEncodingDeclaration(nsString* aEncoding)
nsHtml5StreamParser::internalEncodingDeclaration(nsHtml5String aEncoding)
{
// This code needs to stay in sync with
// nsHtml5MetaScanner::tryCharset. Unfortunately, the
@ -1270,9 +1270,10 @@ nsHtml5StreamParser::internalEncodingDeclaration(nsString* aEncoding)
if (mCharsetSource >= kCharsetFromMetaTag) { // this threshold corresponds to "confident" in the HTML5 spec
return false;
}
nsString newEncoding16; // Not Auto, because using it to hold nsStringBuffer*
aEncoding.ToString(newEncoding16);
nsAutoCString newEncoding;
CopyUTF16toUTF8(*aEncoding, newEncoding);
CopyUTF16toUTF8(newEncoding16, newEncoding);
if (!PreferredForInternalEncodingDecl(newEncoding)) {
return false;