From 7c5a0db237c7a43136ee3cdc6cfb0663778d9e2c Mon Sep 17 00:00:00 2001
From: win7-7 <win7-7@users.noreply.github.com>
Date: Fri, 5 Jul 2019 21:58:21 +0300
Subject: Introduce a new non-heap-allocated type for holding nsStringBuffer*
 in the HTML parser.

An innerHTML setter profile shows about 10% of the time being spent under nsHtml5HtmlAttributes::clear, mostly deleting nsStrings.
---
 parser/html/nsHtml5MetaScanner.cpp | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

(limited to 'parser/html/nsHtml5MetaScanner.cpp')

diff --git a/parser/html/nsHtml5MetaScanner.cpp b/parser/html/nsHtml5MetaScanner.cpp
index d39eacd9b..24f17b02b 100644
--- a/parser/html/nsHtml5MetaScanner.cpp
+++ b/parser/html/nsHtml5MetaScanner.cpp
@@ -30,7 +30,7 @@
 
 #include "nsIAtom.h"
 #include "nsHtml5AtomTable.h"
-#include "nsString.h"
+#include "nsHtml5String.h"
 #include "nsNameSpaceManager.h"
 #include "nsIContent.h"
 #include "nsTraceRefcnt.h"
@@ -86,8 +86,8 @@ nsHtml5MetaScanner::nsHtml5MetaScanner(nsHtml5TreeBuilder* tb)
 nsHtml5MetaScanner::~nsHtml5MetaScanner()
 {
   MOZ_COUNT_DTOR(nsHtml5MetaScanner);
-  nsHtml5Portability::releaseString(content);
-  nsHtml5Portability::releaseString(charset);
+  content.Release();
+  charset.Release();
 }
 
 void 
@@ -771,9 +771,9 @@ bool
 nsHtml5MetaScanner::handleTag()
 {
   bool stop = handleTagInner();
-  nsHtml5Portability::releaseString(content);
+  content.Release();
   content = nullptr;
-  nsHtml5Portability::releaseString(charset);
+  charset.Release();
   charset = nullptr;
   httpEquivState = NS_HTML5META_SCANNER_HTTP_EQUIV_NOT_SEEN;
   return stop;
@@ -786,12 +786,13 @@ nsHtml5MetaScanner::handleTagInner()
     return true;
   }
   if (!!content && httpEquivState == NS_HTML5META_SCANNER_HTTP_EQUIV_CONTENT_TYPE) {
-    nsString* extract = nsHtml5TreeBuilder::extractCharsetFromContent(content, treeBuilder);
+    nsHtml5String extract =
+      nsHtml5TreeBuilder::extractCharsetFromContent(content, treeBuilder);
     if (!extract) {
       return false;
     }
     bool success = tryCharset(extract);
-    nsHtml5Portability::releaseString(extract);
+    extract.Release();
     return success;
   }
   return false;
-- 
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