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From: minich@d.cs.okstate.edu (Robert Minich)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Absolute address to strs in Think C
Message-ID: <1990Sep10.181615.10742@d.cs.okstate.edu>
Date: 10 Sep 90 18:16:15 GMT
References: <583@ohs.UUCP>
Organization: Oklahoma State University
Lines: 34

by stay@ohs.UUCP (Steve Taylor):
> The Think C manual says (page 75):
| "When the Separate STRS option is on, THINK C uses a 4 byte absolute
| address to access the string literals and floating point constants."
| 
| Speculation:
| 
| Since the string literals and fp constants are loaded into the heap
| (and locked), and since any reference to things in this heap object
| are not absolute until that point, then all of those absolute
| references must be set then, after the literals are loaded.  This
| also means (since code is being changed) that they have to be re-set
| every time a code segment with references to the string literals is
| unloaded and loaded, which means either Think C is keeping careful
| tabs on the segment loader (a patch?) or the segment loader is actually
| doing the work.
| 

More speculation:

  why not just reserve a global for "the_STRS_are_here_Ptr", load in the
STRS resource BEFORE calling main() and lock it down, and then just use
references off your global! (I think this is what I saw when I was
poking around in the asm output of THINK C loking for a bug. I was
trying to figure out what all happened in a printf() call and there was
extra BS...



-- 
|_    /| | Robert Minich            |
|\'o.O'  | Oklahoma State University| There are no heroes --
|=(___)= | minich@a.cs.okstate.edu  |   We all wear gray hats.
|   U    | - Ackphtth               |