Gpc July 2005

gpc@gnu.de

25 participants
67 discussions

Array elements as control variables
by Contestcen＠aol.com 23 Jul '05

23 Jul '05

> done, but I much prefer the loop version to the last version. > > Can't you use a macro processor to generate the verbose code? ;-) Yes, I would use the Pascal Macro Compiler for this chore, but whether I code it by hand or generate using the PMC, my program still would contain the verbose code. > Anyway, I see that this is an example, at least in theory. However, > I'd probably do it differently in practice. I think this is more > efficient, since you don't need any comparisons, and in particular > no extra code in the innermost loop which is the most time-critical. > If you need the original start values afterwards, copy the array > before the first loop, of course. > > for a1 := start[1] to max[1] do > begin > for a2 := start[2] to max[2] do > begin > for a3 := start[3] to max[3] do > begin > ... > end; > start[3] := 1 > end; > start[2] := 1 > end; > > Frank This is much nicer code than my version. However I would still choose to make the loop control variables a[1], a[2], a[3], etc., so that when I take the checkpoint the checkpointing procedure could use a loop like for n := 1 to depth do writeln (checkfile, a[n]); Incidentally, when I do this in practice I do not usually test for interruptions at every level in the nested loops. If the loops are nested 30 levels deep I might test for user interrupts only at levels 5, 10, 15 and 20. However, if the interrupt occurs at, say, level 15, you still need to write all of the control variable values from 1 through 15 to the checkpoint file. Frank Rubin

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Mailing list archive is back
by Frank Heckenbach 23 Jul '05

23 Jul '05

After some time of problems the mailing list archives are back at their usual places: http://www.gnu-pascal.de/crystal/gpc/en/ http://www.gnu-pascal.de/crystal/gpc-announce/en/ http://www.gnu-pascal.de/crystal/gpc-doc/en/ The full GPC web site will be restored next week I hope. Frank -- Frank Heckenbach, frank(a)g-n-u.de, http://fjf.gnu.de/, 7977168E GPC To-Do list, latest features, fixed bugs: http://www.gnu-pascal.de/todo.html GPC download signing key: ACB3 79B2 7EB2 B7A7 EFDE D101 CD02 4C9D 0FE0 E5E8

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GPC and Mac implicit pointer objects
by Waldek Hebisch 23 Jul '05

23 Jul '05

As I wrote I updated may implementation of Delphi classes to gpc-20050331. Now, I have put a patch at: http://www.math.uni.wroc.pl/~hebisch/gpc/delphi3.diff With the patch, when one chooses Mac Pascal as a dialect, object model should be compatible with Mac Pascal: -- objects are pointers -- all methods are virtual (that was already implemented in gpc-20050331) -- overriding a method requires `override' keyword -- you can allocate memory for objects with `New' and deallocate it with `Dispose' In default mode the `class' keyword is recognized and allows you to declare Delphi classes. ATM Delphi constructors works only in simplest case (you can not call a constructor inside a (different) constructor). Destructors do not deallocate memory (but `Dispose' applied to a Delphi class will deallocate memory). Also, Delphi builtin `TObject' is unimplemented. This is experimatal (and incomplete) implementation. I would like to get some feedback about missing features. Also, if I got semantics of implemented parts correctly. ATM I know only about one missing Mac objects feature (which is almost surely due to my lack of knowledge about Mac Pascal): GPC requires all methods to be defined in the same unit as the object (TCL sources implement methods in different units). And of course test programs are welcome. -- Waldek Hebisch hebisch(a)math.uni.wroc.pl

5 38

Update for Mac OS X
by Adriaan van Os 23 Jul '05

23 Jul '05

Updated compiler sources, binaries and patches for Mac OS X can be downloaded from <http://www.microbizz.nl/gpc.html>. Please note that there are separate binary installer packages for Mac OS X 10.3 and Mac OS X 10.4. The distribution is based on gpc-20050331, gcc-3.4.4 and Waldek's MacPascal (& Delphi) object support patches (delphi14.diff). Regards, Adriaan van Os

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New as function
by Peter N Lewis 22 Jul '05

22 Jul '05

Does New as a function return nil or does it still give a runtime error? If I want to allocate memory, but handle it gracefully if it fails, what are the recommended approaches? Thanks, Peter. -- <http://www.stairways.com/> <http://download.stairways.com/>

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unit dependencies (about GPC compiler internals)
by Igor Marnat 22 Jul '05

22 Jul '05

Hello list! I try to build big enough project (~170 units) with --autobuild option. It was built successfully before but from some time it stopped to be built. It seems to me that the problem is in a branchy dependencies between units which goes more and more complicated. Build process stops with the message 'error: module/unit `mainvar.pas' could not be compiled'. I investigated GPC sources a bit (particularly, module.c unit). As far as I got, the problem is: when it try to build mainvar.pas, it stores file name (mainvar.pas) in temporary file with label #compiling. Then the compiler goes to compile units from mainvar.pas "uses" section, some of these units in their turn uses unit mainvar (indirectly, may be). So the compiler tries to compile mainvar.pas once again a bit later and add its name (mainvar.pas) to temporary file again with #compiling label. Before every attempt it checks that the file is mentioned in the temporary file less then 2 times (by call "find_automake_tempfile_entry ("#compiling: ", fn, 2)"). When it tries to add mainvar.pas to a temporary file in a third time, it find that this file name has been already added twice to temporary file and stops building process with error mentioned above. There are the comments in compile_module function in module.c file: /* File is being compiled => avoid a cycle. This also avoids compiling one source file twice with `--autobuild'. */ /* @@@@@@ Kludge. Allow two simultaneous compilations of the same module (fjf40[57].pas), but not infinitely many (sven18[a-c].pas). The number 2 is arbitrary. */ Is it really true that number 2 is arbitrary? Should I review module dependencies or there is some other soluton (may be, change 2 to 3 :-))? May be I missed something? GPC version: "gpc version 20040516, based on gcc-3.3.2". Regards, Igor Marnat mailto:marny@rambler.ru

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gcc-3.4.4
by Russell Whitaker 22 Jul '05

22 Jul '05

Hi Now that gcc-3.4.4 is out, thought I'd try it with gcc-20050331. Using gcc-3.4.3.diff, got these rejects: gcc.c.rej varasm.c.rej version.c.rej That last one I needed to patch version.c manualy so gcc would compile. After I did it, wondered if it might be beter to patch gpc instead? Since have 2 cpu's, tried "make -j3 bootstrap". The c part ran ok, it quit in the rts with an error message. "make bootstrap" & installed with no problem: Reading specs from /usr/local/lib/gcc/i686-pc-linux-gnu/3.4.4/specs Configured with: ../gcc-3.4.4/configure --enable-languages=c,c++,pascal Thread model: posix gpc version 20050331, based on gcc-3.4.4 Ran gpc's test using gcc-3.3.5 and then gcc-3.4.4, got one new fail: avo7.pas And ran the tests with "time make": gcc-3.3.5 gcc-3.4.4 ---------- ---------- real 22m24.452s 20m49.896s user 11m40.872s 10m52.583s system 10m25.648s 9m41.803s And that's it Russ

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Packing strings ()
by Contestcen＠aol.com 22 Jul '05

22 Jul '05

>> In any case, we are getting off the subject, > > Finally, a word of wisdom... > >> which was how to store a set of >> varying-length strings with minimal wasted space. > > ... except that the subject of this mailing list is not "how to store > something somewhere", but "the GNU Pascal Compiler", in case you > didn't notice. Discussion of the Pascal Macro Compiler belongs to the > Pascal Macro Compiler mailing list. > > Another thing which you apparently didn't notice, although three > people already asked you to do so: please, turn off HTML in your mail. > > Emil Jerabek The subject of this thread in the GPC mailing list is how to store character strings without wasted space. Notive that the subject of this thread is "Packing strings ()" That was the subject of the original posting that started the thread. I have mentioned the Pascal Macro Compiler because it comes with macros that have the ability to pack strings without wasted space. That is the original question, and this is an appropriate answer to the question. I have not discussed the Pascal Macro Compiler in any other context except to answer the question in this thread. I have gone to great lengths to avoid creating any HTML in my postings to this mailing list. To avoid HTML-style quoting, I am copying the postings myself, and inserting all of those greater-than signs by hand. I have avoided putting in any links because I have not found a way to suppress the anchor tags. I have not done any form of text emphasis other than using caps, used no colors, inserted no pictures or backgrounds, and given no email links. I don't see what I am doing that makes you see HTML in my posts. I can't see any signs of HTML in these emails, other than line breaks, which are already in the emails when I receive them from the mailing list. If I manually removed the line breaks, then the gt-signs would no longer be along the left edge, but interspersed in the text. I don't think that would be desirable. I have tried to stick to the subject, but other people have been attacking my postings for all sorts of reasons that I believe are tangential at best, such as the use of text compression, hashing, trees and linked lists. I have tried to point out that these are separate issues, but I get attacked again when I do that. I am starting to wonder if this isn't some kind of hazing for the new guy, and if I want to join this fraternity then I have to undergo this ritual. Or maybe you are just testing me to see if I am worthy to be in this august company. Frank Rubin

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Re: New as function
by Peter N Lewis 22 Jul '05

22 Jul '05

> > If I want to allocate memory, but handle it gracefully if it fails, > > what are the recommended approaches? > >You could call GetMemPtr directly (with all the drawbacks of using >GetMem vs. New, as you know), or install your own allocator >(wrapper) which returns `UndocumentedReturnNil' (as, e.g. BPGetMem >in the System unit does). As the name indicates, this was really a >quick kludge, added to support this BP compatibility unit ... Sounds ugly. Does this mean the compiler actually does cope with New returning nil? Ie, it wont call Initialize? >I don't think we have a really nice way to do it ATM. Is there (or perhaps should there be) a way to disable the run time error temporarily and manage to return New with a nil value? If the compiler already copes with New potentially returning nil, then presumably all it would need would be a flag to heap.pas to return nil without a runtime error? It looks like heap.pas would need to be a little more careful with how it copes with nil (for example, currently AddToMarkList and AddHeapRange would be called if GetMemPtr^ was allowed to return nil without generating a runtime error. New( s, 10 ); if s <> nil then is much cleaner than s := GetMemPtr^( SizeOf(String(10)) ); if s <> nil then begin Initialize(s^); I presume the two sequences of code would be equivalent if the runtime error in New was avoided and returned nil instead. I'm happy to add support for a flag in heap.pas if that is desired, assuming that it wont have any affect on the compiler and the compiler already does handle the New returning nil case. Thanks, Peter. -- <http://www.stairways.com/> <http://download.stairways.com/>

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Mac OS X Pascal Interfaces
by Adriaan van Os 21 Jul '05

21 Jul '05

The latest version of the Mac OS X Pascal Interfaces <http://www.microbizz.nl/GPCInterfacesF.tar.gz> can be downloaded from <http://www.microbizz.nl/gpc.html>. Detailed release notes are included with the package, a summary is given below. Most important news is that compatible interfaces for FPC have been added. I have to thank Peter N. Lewis and Gale Paeper for the effort they put in this new release and Olle Raab for his help in creating the FPC interfaces. Regards, Adriaan van Os

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Gpc July 2005