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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.
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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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6
parser/html/nsHtml5MetaScannerCppSupplement.h
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@ -19,13 +19,15 @@ nsHtml5MetaScanner::sniff(nsHtml5ByteReadable* bytes, nsACString& charset)
}
bool
nsHtml5MetaScanner::tryCharset(nsString* charset)
nsHtml5MetaScanner::tryCharset(nsHtml5String charset)
{
// This code needs to stay in sync with
// nsHtml5StreamParser::internalEncodingDeclaration. Unfortunately, the
// trickery with member fields here leads to some copy-paste reuse. :-(
nsAutoCString label;
CopyUTF16toUTF8(*charset, label);
nsString charset16; // Not Auto, because using it to hold nsStringBuffer*
charset.ToString(charset16);
CopyUTF16toUTF8(charset16, label);
nsAutoCString encoding;
if (!EncodingUtils::FindEncodingForLabel(label, encoding)) {
return false;