Proposed Change to gnu/gcj/runtime/StackTrace.java

Tue Mar 18 00:14:00 GMT 2003

Hello Andrew,
On Sun, 2003年03月16日 at 02:40, Andrew Haley wrote:
> > Does this make sense? 
>> It does. Now I'm trying to think of a way to do this with no overhead -- 
> the run time speed of this method is important.
>> I'm thinking of a native method that does 
>> table[h] = key;
>> with no checking. So we could have two private native methods that do
> an array assignment, one with the check and one without. Or maybe we
> could find some way to make the compiler not emit the _Jv_CheckMemRef
> when it's compiling some code.

Yes, one way could be to add a put_ method to the IdentityHashMap that
actually relies on a native implementation of table[h] = key, so to
avoid the checking. 
Moreover we can declare the method put_ with package access rights and
take advantage of the fact that for CNI package access level maps to
C++ public. This, would allow us to access the method put_ from
natStactTrace, but would not expose this method to regular users.
Cheers, 
 Angelo 
-- 
Angelo Corsaro
Department of Computer Science
Washington University
One Brookings Drive, Box 1045
St. Louis, MO 63130
http://www.cs.wustl.edu/~corsaro