Hi Patrick.
The String/Hashtable problem is, as you identified, a "bootstrapping"
problem. It is not at all necessary to make "intern()" a native method,
or to eliminate the recursive dependency between Hashtable and String.
The solution is to have a special "bootstrapping" mode in your VM.
While your VM is in that mode, it keeps its own internal table of
Strings created through LDC. At the end of the bootstrapping stage, the
VM registers all Strings withing its own table into String's intern
table by calling intern() on these string objects.
The idea is to try to touch to as little as possible things while
bootstrapping so that it becomes less likely to get a duplicate String
within both the internal table and String's one. If you really want to
make sure, you could trap any call to String.intern() in the
bootstrapping stage, if if there's one, abort. In other words,
String.intern() would be prohibited in the bootstrapping mode.
Personally, I decided to simply verify manually that such a call does
not happen, instead of hacking such a trap into the bootstrapping code.
Hope this helps.
Etienne
--
+--------------------------------------------------------------------+
| �tienne M. Gagnon mailto:[EMAIL PROTECTED] |
| Professeur adjoint T�l�phone: (514) 987-3000 poste 8215 |
| Bureau: PK-4930 T�l�copieur: (514) 987-8477 |
| D�partement d'informatique, UQ�M http://www.info.uqam.ca/ |
| Auteur de SableVM http://www.sablevm.org/ |
| et de SableCC http://www.sablecc.org/ |
+--------------------------------------------------------------------+
| Etienne M. Gagnon mailto:[EMAIL PROTECTED] |
| Assistant Professor Phone: (514) 987-3000 ext. 8215 |
| Office: PK-4930 Fax: (514) 987-8477 |
| Department of Computer Science, UQAM http://www.info.uqam.ca/ |
| Author of SableVM http://www.sablevm.org/ |
| and SableCC http://www.sablecc.org/ |
+--------------------------------------------------------------------+
_______________________________________________
Classpath mailing list
[EMAIL PROTECTED]
http://mail.gnu.org/mailman/listinfo/classpath
