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8 Sep 2010


      Let me try that with the correct email address...
Begin forwarded message:
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From: John M McIntosh johnmci@smalltalkconsulting.com
Date: September 8, 2010 2:20:29 AM PDT
To: Squeak VM Developers squeak-vmdev@lists.sourceforge.net
Subject: squeak 32bit clean, no? yes? 
Reply-To: johnmci@smalltalkconsulting.com
It's 2:05am I should be in bed but I'm confused.
given BaseHeaderSize is 4 
foo->newMethod is a usqInt  (unsigned)
I see in a interp.c 
Automatically generated from Squeak on #(27 April 2009 5:35:31 pm)
sqInt activateNewMethod(void) {
register struct foo * foo = &fum;
   sqInt initialIP;
   sqInt newContext;
   sqInt where;
   sqInt methodHeader;
   sqInt tempCount;
   sqInt i;
   sqInt nilOop;
   sqInt tmp;
methodHeader = longAt((foo->newMethod + BaseHeaderSize) + (HeaderIndex << ShiftForWord));
So that is a longAt: ( unsigned sqInt + 4)
But in  the interp.c code I generated in July I have 
   methodPointer (a sqInt) =  foo->newMethod (a usqint) 
   then 
   methodHeader = longAt((methodPointer + (BASE_HEADER_SIZE)) + (HeaderIndex << (SHIFT_FOR_WORD)));
So that is a longAt: (sqInt + 4).
Er so if  foo->newMethod is > 0x7FFFFFFF  won't that +4 not do what we think it should do? 
Or should I go to bed now?
/* Automatically generated from Squeak on 8 July 2010 12:32:36 pm 
  by VMMaker 4.2.6
*/
sqInt activateNewMethod(void) {
register struct foo * foo = &fum;
   sqInt tempCount;
   sqInt nilOop;
   sqInt where;
   sqInt initialIP;
   sqInt i;
   sqInt newContext;
   sqInt methodHeader;
   sqInt methodPointer;
   sqInt tmp;
   sqInt activeCntx;
   sqInt valuePointer;
   sqInt valuePointer1;
/* begin headerOf: */
   methodPointer = foo->newMethod;
   methodHeader = longAt((methodPointer + (BASE_HEADER_SIZE)) + (HeaderIndex << (SHIFT_FOR_WORD)));
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John M. McIntosh johnmci@smalltalkconsulting.com   Twitter:  squeaker68882
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
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John M. McIntosh johnmci@smalltalkconsulting.com   Twitter:  squeaker68882
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
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Fwd: squeak 32bit clean, no? yes?

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