Objective-C bug and fix

Article View: gnu.gcc.bug

Article #41

#41

From: Chris Dodd
Date: Mon, 02 Nov 1992 09:05

24 lines
1191 bytes

I'm not sure if this is the right place to send this; there doesn't
seem to be objc-specific bug mailing list.

Basically, the problem is that the receiver of every message expression
gets evaluated twice; this causes problems if the receiver-expression
has side effects.  Patch:

*** objc-actions.c.orig	Mon Nov  2 16:38:25 1992
--- objc-actions.c	Mon Nov  2 16:50:20 1992
***************
*** 2631,2636 ****
--- 2631,2638 ----
        if (statically_allocated)
  	receiver = build_unary_op (ADDR_EXPR, receiver, 0);
  
+       /* don't evaluate the receiver twice */
+       receiver = save_expr(receiver);
        self_object = receiver;
      }
    else

-------------------------------------------------------
Chris Dodd
dodd@csl.sri.com

Technical Details

Message-ID: <9211030105.AA27564@pekoe.csl.sri.com>

Path:

arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!hri.com!spool.mu.edu!caen!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!csl.sri.com!dodd

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!hri.com!spool.mu.edu!caen!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!csl.sri.com!dodd
From: dodd@csl.sri.com (Chris Dodd)
Newsgroups: gnu.gcc.bug
Subject: Objective-C bug and fix
Message-ID: <9211030105.AA27564@pekoe.csl.sri.com>
Date: 2 Nov 92 09:05:18 GMT
Sender: gnulists@ai.mit.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 24
Approved: bug-gcc@prep.ai.mit.edu