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Re: Language Design

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Gene <gene.ressler@gmail.com> writes:

> The old Turbo Pascal 2.0 dialect was pretty remarkable. There was a
> version for Z80 (CP/M) and 8086 (MSDOS).  I think the whole compiler
> was only 50K or so.

[...]

> Pascal is also straightforward to compile, especially if you don't
> allow nested functions/procedures (although Turbo did).

Turbo Pascal used shallow binding, which makes nested procedures
relatively simple to implement, though it made reference parameters
behave in a non-standard way.

With shallow binding, each variable name has its own global memory
address.  When you during execution pass a variable declaration, you
stack the current value of the variable and set the new value according
to the declaration.  When you exit the scope of the declaration, you
restore the old value from the stack.

IIRC, later versions of Turbo Pascal changed this to be more standard
compliant (i.e., by using deep binding).

	Torben

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Language Design Billy Mays <81282ed9a88799d21e77957df2d84bd6514d9af6@myhashismyemail.com> - 2011-07-18 16:16 -0400
  Re: Language Design Roberto Waltman <usenet@rwaltman.com> - 2011-07-18 18:10 -0400
  Re: Language Design Srinivas Nayak <sinu.nayak2001@gmail.com> - 2011-07-18 22:54 -0700
  Re: Language Design anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-07-19 13:12 +0000
  Re: Language Design Andreas Zwinkau <zwinkau@kit.edu> - 2011-07-20 13:26 +0200
  Re: Language Design mac <acolvin@efunct.com> - 2011-07-23 01:11 +0000
  Re: Language Design Christophe de Dinechin <christophe.de.dinechin@gmail.com> - 2011-07-23 08:17 -0700
  Re: Language Design Oleg Sesov <osesov@gmail.com> - 2011-07-23 14:58 -0700
  Re: Language Design Gene <gene.ressler@gmail.com> - 2011-07-26 10:28 -0700
    Re: Language Design Roberto Waltman <usenet@rwaltman.com> - 2011-07-28 13:22 -0400
    Re: Language Design torbenm@diku.dk (Torben Ægidius Mogensen) - 2011-08-08 16:11 +0200
  Re: Language Design tm <thomas.mertes@gmx.at> - 2011-07-27 08:11 -0700
  Re: Language Design "s_dubrovich@yahoo.com" <s_dubrovich@yahoo.com> - 2011-08-04 18:43 -0700
  Re: Language Design for a tiny processor "BartC" <bc@freeuk.com> - 2011-08-08 22:54 +0100

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