New version of the Stanford Pascal compiler
"Bernd Oppolzer berndoppolzer-/[email protected] [H390-MVS]" <[email protected]> Mon, 6 Nov 2017 10:50:10 +0100
| Newsgroups | gmane.comp.emulators.hercules390.mvs,gmane.comp.emulators.hercules390.vm |
|---|---|
| Message-ID | <[email protected]> |
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Hello H390-MVS list,
hello H390-VM list,
the new 11.2017 release of the Stanford Pascal compiler is now available
for MVS (TK4-) and Windows;
new versions for VM/CMS and OS/2 will follow soon.
The new compiler version is in many aspects much better than the
previous version;
many hidden errors (some of them 40 years old) have been corrected. More
details below.
The new version of PASFORM (source code formatter) now uses the same
symbol scanner
as the compiler (PASSCAN) and now supports C++ style comments, too.
Thereis anyway much room for improvements, but this redesign is a good
starting point.
Regarding old errors:
it turned out, that the old compiler not only did a sub-optimal job,
when diagnosing syntax errors, see, for example:
838 SETSTRING = array [ 1 .. MAXSETLx ] of CHAR ;
!
+++ Error P104: IDENTIFIER IS NOT DECLARED
the old compiler showed an additional error P107: INCOMPATIBLE SUBRANGE
TYPES;
this was one of the easier situations to fix. Sometimes there were up to
three messages
which followed a simple P104 error, although not helpful.
But the old compiler even crashed on very simple situations:
4653 else
!
+++ Error P006: ILLEGAL SYMBOL
the old compiler crashed in this situation without producing a listing;
the error was a semicolon before the else which should not be there.
I detected most of these errors, because I activated the runtime checks
in the previous version
of the compiler (which were off in the last 40 years), and then, when
trying to fix the
runtime error messages (for example subrange errors etc.), I discovered
the use of
uninitialized variables etc.
IMO, the compiler now is much better and much more stable than before,
although there will be situations, of course, where the reaction on certain
syntax errors will not be satisfactory.
Once again, I would like to emphasize that runtime checks (like checking
of array bounds
and subranges and enum values) are crucial when developing secure software;
at least that's my opinion, which is approved by this experience.
The new compiler version is available from the website
http://bernd-oppolzer.de/job9.htm
<https://l.facebook.com/l.php?u=http%3A%2F%2Fbernd-oppolzer.de%2Fjob9.htm&h=ATP81Co7fs9Gh-RWu_RJNYCC3dmNebHYSCq9_7LIblA_FiLR_tJb4OeXRN5mheGWWDZmc9sryEM-Og_fncHC-DCA8jYZ9Qk7tZ_mNhy1zH0CZmsbOv50MzkfGhrmfUOKWcQ19j3XkNwqGIb3A04LnUwEVyNpdSHOOwjS6e6tqNEOqvsofNJ3TwV05Q5tkpME8B2iEteR3JFfZGTD1vFhcI2sW_ncSdZckbKnFlg-XMdacMohgjltvkByKVE7tvp0IwEg2xi6JKh2NCF6g8Up45h0BoBxnU7OwmvTPuU>,
as usual.
Additions informations on this FB page:
https://www.facebook.com/StanfordPascal/
Best regards, have a nice day
Bernd Oppolzer
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<p>
<p>Hello H390-MVS list, <br>
hello H390-VM list, <br>
<br>
the new 11.2017 release of the Stanford Pascal compiler is now
available for MVS (TK4-) and Windows; <br>
new versions for VM/CMS and OS/2 will follow soon.</p>
<p> The new compiler version is in many aspects much better than the
previous version; <br>
many hidden errors (some of them 40 years old) have been
corrected. More details below.</p>
<p> The new version of PASFORM (source code formatter) now uses the
same symbol scanner <br>
as the compiler (PASSCAN) and now supports C++ style comments,
too. <br>
There<span class="text_exposed_show"> is anyway much room for
improvements, but this redesign is a good starting point. </span></p>
<div class="text_exposed_show">
<p> Regarding old errors: </p>
<p> it turned out, that the old compiler not only did a
sub-optimal job, when diagnosing syntax errors, see, for
example: </p>
<p> <tt>838 SETSTRING = array [ 1 .. MAXSETLx ] of CHAR ;</tt><tt><br>
</tt><tt> !</tt><tt><br>
</tt><tt> +++ Error P104: IDENTIFIER IS NOT DECLARED</tt></p>
<p><tt> </tt>the old compiler showed an additional error P107:
INCOMPATIBLE SUBRANGE TYPES; <br>
this was one of the easier situations to fix. Sometimes there
were up to three messages <br>
which followed a simple P104 error, although not helpful. </p>
<p> But the old compiler even crashed on very simple situations: </p>
<p> <tt>4653 else</tt><tt><br>
</tt><tt> !</tt><tt><br>
</tt><tt> +++ Error P006: ILLEGAL SYMBOL</tt></p>
<p><tt> </tt>the old compiler crashed in this situation without
producing a listing; <br>
the error was a semicolon before the else which should not be
there. </p>
<p> I detected most of these errors, because I activated the
runtime checks in the previous version <br>
of the compiler (which were off in the last 40 years), and then,
when trying to fix the <br>
runtime error messages (for example subrange errors etc.), I
discovered the use of <br>
uninitialized variables etc. </p>
<p> IMO, the compiler now is much better and much more stable than
before, <br>
although there will be situations, of course, where the reaction
on certain <br>
syntax errors will not be satisfactory.</p>
<p> Once again, I would like to emphasize that runtime checks
(like checking of array bounds <br>
and subranges and enum values) are crucial when developing
secure software; <br>
at least that's my opinion, which is approved by this
experience.</p>
<p> The new compiler version is available from the website <a href="https://l.facebook.com/l.php?u=http%3A%2F%2Fbernd-oppolzer.de%2Fjob9.htm&h=ATP81Co7fs9Gh-RWu_RJNYCC3dmNebHYSCq9_7LIblA_FiLR_tJb4OeXRN5mheGWWDZmc9sryEM-Og_fncHC-DCA8jYZ9Qk7tZ_mNhy1zH0CZmsbOv50MzkfGhrmfUOKWcQ19j3XkNwqGIb3A04LnUwEVyNpdSHOOwjS6e6tqNEOqvsofNJ3TwV05Q5tkpME8B2iEteR3JFfZGTD1vFhcI2sW_ncSdZckbKnFlg-XMdacMohgjltvkByKVE7tvp0IwEg2xi6JKh2NCF6g8Up45h0BoBxnU7OwmvTPuU" target="_blank" data="{"tn":"-U"}" data="async" rel="nofollow">http://bernd-oppolzer.de/job9.htm</a>,
as usual. <br>
Additions informations on this FB page:
<a class="moz-txt-link-freetext" href="https://www.facebook.com/StanfordPascal/">https://www.facebook.com/StanfordPascal/</a><br>
</p>
<p>Best regards, have a nice day <br>
</p>
<p>Bernd Oppolzer<br>
</p>
<p><br>
</p>
</div>
</p>
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