Supported sourceURL comments for scripts having a name.

src/messages.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 514 matching lines @@
  * @return {number}
  *     Number of source lines.
  */
 function ScriptLineCount() {
   // Return number of source lines.
   return this.line_ends.length;
 }
 
 
 /**
- * Returns the name of script if available, contents of sourceURL comment
- * otherwise. See
+ * If sourceURL comment is available and script starts at zero returns sourceURL
+ * comment contents. Otherwise, script name is returned. See
  * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt
  * for details on using //@ sourceURL comment to identify scritps that don't
  * have name.
  *
  * @return {?string} script name if present, value for //@ sourceURL comment
  * otherwise.
  */
 function ScriptNameOrSourceURL() {
-  if (this.name) {
+  if (this.line_offset > 0 || this.column_offset > 0) {
     return this.name;
   }
 
   // The result is cached as on long scripts it takes noticable time to search
   // for the sourceURL.
-  if (this.hasCachedNameOrSourceURL)
-      return this.cachedNameOrSourceURL;
+  if (this.hasCachedNameOrSourceURL) {
+    return this.cachedNameOrSourceURL;
+  }
   this.hasCachedNameOrSourceURL = true;
 
   // TODO(608): the spaces in a regexp below had to be escaped as \040
   // because this file is being processed by js2c whose handling of spaces
   // in regexps is broken. Also, ['"] are excluded from allowed URLs to
   // avoid matches against sources that invoke evals with sourceURL.
   // A better solution would be to detect these special comments in
   // the scanner/parser.
   var source = ToString(this.source);
   var sourceUrlPos = %StringIndexOf(source, "sourceURL=", 0);
@@ skipping 697 matching lines @@
     throw e;
   }
 }
 
 
 InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]);
 
 // Boilerplate for exceptions for stack overflows. Used from
 // Isolate::StackOverflow().
 var kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);