Experimental profiler: split RegExp.test() for better optimization.

src/regexp.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 232 matching lines @@
       return false;
     }
     lastMatchInfoOverride = null;
     this.lastIndex = lastMatchInfo[CAPTURE1];
     return true;
   } else {
     // Non-global regexp.
     // Remove irrelevant preceeding '.*' in a non-global test regexp.
     // The expression checks whether this.source starts with '.*' and
     // that the third char is not a '?'.
-    if (%_StringCharCodeAt(this.source, 0) == 46 &&  // '.'
-        %_StringCharCodeAt(this.source, 1) == 42 &&  // '*'
-        %_StringCharCodeAt(this.source, 2) != 63) {  // '?'
-      if (!%_ObjectEquals(regexp_key, this)) {
-        regexp_key = this;
-        regexp_val = new $RegExp(SubString(this.source, 2, this.source.length),
-                                 (!this.ignoreCase
-                                  ? !this.multiline ? "" : "m"
-                                  : !this.multiline ? "i" : "im"));
-      }
-      if (%_RegExpExec(regexp_val, string, 0, lastMatchInfo) === null) {
-        return false;
-      }
+    var regexp = this;
+    if (%_StringCharCodeAt(regexp.source, 0) == 46 &&  // '.'
+        %_StringCharCodeAt(regexp.source, 1) == 42 &&  // '*'
+        %_StringCharCodeAt(regexp.source, 2) != 63) {  // '?'
+      regexp = TrimRegExp(regexp);
     }
-    %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, string, lastIndex]);
+    %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [regexp, string, lastIndex]);
     // matchIndices is either null or the lastMatchInfo array.
-    var matchIndices = %_RegExpExec(this, string, 0, lastMatchInfo);
+    var matchIndices = %_RegExpExec(regexp, string, 0, lastMatchInfo);
     if (matchIndices === null) return false;
     lastMatchInfoOverride = null;
     return true;
   }
 }
 
+function TrimRegExp(regexp) {
+  if (!%_ObjectEquals(regexp_key, regexp)) {
+    regexp_key = regexp;
+    regexp_val =
+      new $RegExp(SubString(regexp.source, 2, regexp.source.length),
+                  (regexp.ignoreCase ? regexp.multiline ? "im" : "i"
+                                     : regexp.multiline ? "m" : ""));
+  }
+  return regexp_val;
+}
+
 
 function RegExpToString() {
   // If this.source is an empty string, output /(?:)/.
   // http://bugzilla.mozilla.org/show_bug.cgi?id=225550
   // ecma_2/RegExp/properties-001.js.
   var src = this.source ? this.source : '(?:)';
   var result = '/' + src + '/';
   if (this.global) result += 'g';
   if (this.ignoreCase) result += 'i';
   if (this.multiline) result += 'm';
@@ skipping 185 matching lines @@
                                     NoOpSetter, DONT_ENUM | DONT_DELETE);
 
   for (var i = 1; i < 10; ++i) {
     %DefineOrRedefineAccessorProperty($RegExp, '$' + i,
                                       RegExpMakeCaptureGetter(i), NoOpSetter,
                                       DONT_DELETE);
   }
 }
 
 SetUpRegExp();