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.

1 files changed, 4 insertions, 3 deletions

diff --git a/parser/html/nsHtml5ArrayCopy.h b/parser/html/nsHtml5ArrayCopy.h
index 78ed65568..594a801ab 100644
--- a/parser/html/nsHtml5ArrayCopy.h
+++ b/parser/html/nsHtml5ArrayCopy.h
@@ -51,10 +51,11 @@ class nsHtml5ArrayCopy {
       memcpy(target, source, size_t(length) * sizeof(int32_t));
     }
 
-    static inline void
-    arraycopy(nsString** source, nsString** target, int32_t length)
+    static inline void arraycopy(nsHtml5String* source,
+                                 nsHtml5String* target,
+                                 int32_t length)
     {
-      memcpy(target, source, size_t(length) * sizeof(nsString*));
+      memcpy(target, source, size_t(length) * sizeof(nsHtml5String));
     }
 
     static inline void