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Article View: comp.lang.modula2
Article #2114

Re: Oberon vs Modula-2

#2114
From: mdlcpgs
Date: Tue, 17 Nov 1992 21:15
26 lines
1828 bytes
>That doesn't work as soon as your procedure is public and (directly or
>indirectly) calls some procedure not fully known to the compiler, since
>the original argument may be accessible and modified behind the back of the
>supposedly innocent routine. According to the current definition it only
>sees a copy made at the entry and therefore would not be influenced by the
>perfectly legal modification, but due to our smart optimizer ... :-(

Hobby horse time again! I will re-assert my belief that the Wirth languages
need other optional attributes on variable declarations and formal
parameter definitions besides just TYPE (and VAR in the case of formal
parameters).

Very useful are:  Static; (I dont like module level being only way to
declare static variables when the scope of variable may be only one
procedure. Local modules in M2 were about the most complicated away to
achieve what the a static identifier could do imaginable)
		  location; specifying the absolute memory address
of variable (yes I know M2 implementation allow this).
		  Readonly; More power to compiler for finding logic
errors and the solution to the by-value or by-reference versus
efficiency problem in format parameters;

Without these, we expect the compiler to perform miracles with limited
infomation. Adding them allows more power to compiler and efficency without
compromise of method.
	Phil
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References: <1992nov16.080647.26783@informatik.uni-ulm.de>,<gpjqq!h+@aix01.rz.fht-mannheim.de>

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Path: arc1-ca.pugleaf.net!sparky!uunet!comp.vuw.ac.nz!am.dsir.govt.nz!lhn.gns.cri.nz
references: <1992nov16.080647.26783@informatik.uni-ulm.de>,<gpjqq!h+@aix01.rz.fht-mannheim.de>
From: mdlcpgs@lhn.gns.cri.nz
Newsgroups: comp.lang.modula2
Subject: Re: Oberon vs Modula-2
Message-ID: <2b0a09a8.44aa@lhn.gns.cri.nz>
Date: Tue, 17 Nov 92 21:15:20 GMT  
Organization: Institute of Gelogical & Nuclear Sciences, New Zealand.
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