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From: jspencer@p510.f22.n282.z1.mmug.edgar.mn.org (Jim Spencer)
Newsgroups: comp.sys.mac.programmer
Subject: MPW Object Pascal, linkers and general hassles...(help)
Message-ID: <2.27C5B496@mmug.edgar.mn.org>
Date: 22 Feb 91 23:37:13 GMT
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Lewis Aj writes in a message to All

LA> I've been programming the Mac under MPW Pascal (3.1) for about 
LA> two weeks, and have been having some success writing XCMDs for 
LA> Hypercard 2.0. For various resons I decided to try experimenting 
LA> with objects, and have run into severe problems. 
LA> I wrote a small XCMD that used objects, which compiled no problem, 
LA> but when I tried to link it, I got a set of errors which went 
LA> more or less as follows... 
LA> ### While reading file "ObjectWindow.p.o" ###Link: Error: OpCode 
LA> is not JSR, JMP, LEA or PEA. (Error 41) at $FFFFFE in %_XWINOBJECT 

While I'm not exactly sure why this is the error message you get, the problem comes from the fact that Object Pascal accesses methods via a jump table referenced from A5.  In an XCMD, A5 is not yours to play with.
 

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                   Jim Spencer (jspencer@mmug.edgar.mn.org)
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