Article View: comp.std.c
Article #496Re: Could a function change its argument(s)!?
From: Rick Schubert
Date: Fri, 25 Aug 1989 22:30
Date: Fri, 25 Aug 1989 22:30
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1290 bytes
In article <1190@tukki.jyu.fi> tarvaine@tukki.jyu.fi (Tapani Tarvainen) writes: >More specifically, would it be legal to implement free() so >that it checks all such registers and trashes them (substituting >some harmless value) if they contain a pointer which becomes >invalid (points into the freed area)? There is a principle that states that the implementation may do anything if a conforming program cannot tell the difference (I think this is part of the "as if" rule). This would seem to apply here. Since there doesn't appear to be any way that a conforming program could use the contents of such registers (until they are reassigned legitimate values), it doesn't seem like it would make any difference if they were trashed. -- Rick Schubert (rns@se-sd.sandiego.NCR.COM)
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!uunet!ncrlnk!ncr-sd!se-sd!rnsReferences:
<319@cubmol.BIO.COLUMBIA.EDU> <1190@tukki.jyu.fi>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!uunet!ncrlnk!ncr-sd!se-sd!rns From: rns@se-sd.NCR.COM (Rick Schubert ) Newsgroups: comp.std.c Subject: Re: Could a function change its argument(s)!? Summary: in some cases! Message-ID: <2026@se-sd.NCR.COM> Date: 25 Aug 89 22:30:05 GMT References: <319@cubmol.BIO.COLUMBIA.EDU> <1190@tukki.jyu.fi> Reply-To: rns@se-sd.UUCP (Rick Schubert (AEP)) Organization: NCR Corporation, SE-San Diego Lines: 14