janb at pmatrix.com
Sat Jul 18 00:39:08 UTC 1998
At 03:35 PM 7/14/98 +0200, Georg Gollmann wrote:
>So...shouldn´t all variables that hold addresses (OOPs) be declared as
>unsigned instead of int (or am I barking up the wrong tree) ?
Assuming addresses have a bitvalue that matches positive "int" is a real
bad move. I can quickly think of a couple of OS's where this will not
allways be true. The Enterprise version of Windows NT 4.0 uses a 3 GByte
user mode address space, so 1/3 of the addresses are negative int's. Any
process shared memory on Win9x I believe will also be above 2 GB.
Future porting to 64-bit processors may also be a big issue. I believe
Microsoft has said the Intel/HP Merced version of WinNT will use a 32-bit
int, but 64-bit pointers. Welcome back to FAR pointers. For maximum
portability,the VM really should treat pointers and int's as potentially
A comment was made here that Squeak Smalltalk should be easily portable for
the next 20 years. My guess is in 20 years we will no longer have 32-bit
processors, so how true is this in the context of 64-bit processors? (with
64-bit pointers and some size of int's)? Is there a 64-bit DEC (or are we
supposed to say Compaq now) Alpha version of Squeak right now?
Jan Bottorff, President
Paradigm Matrix, Inc.
Paradigm Matrix Inc., San Ramon California
"video products and development services for Win32 platforms"
Internet: Jan Bottorff janb at pmatrix.com
Phone: voice (925) 803-9318
fax (925) 803-9397
PGP: public key <http://www-swiss.ai.mit.edu/~bal/pks-toplev.html>
fingerprint 52 CB FF 60 91 25 F9 44 6F 87 23 C9 AB 5D 05 F6
More information about the Squeak-dev