Re: [fpc-pascal] Test Free Pascal program not compiling
On Mon, 12 Sep 2022, 02:59 Terry A. Haimann via fpc-pascal, < fpc-pascal@lists.freepascal.org> wrote: > Trying to compile a small test pascal program on a arm cpu. I beleive > it is an a53. Libre Le Potato > > I am getting the following error: > > Error: Error while assembling exitcode 1 > > Thanks in advance, > > Terry H. > Enable the compiler's verbose mode (-va). The real error is sometimes printed much earlier in the compiler output. > ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
[fpc-pascal] Test Free Pascal program not compiling
Trying to compile a small test pascal program on a arm cpu. I beleive it is an a53. Libre Le Potato I am getting the following error: Error: Error while assembling exitcode 1 Thanks in advance, Terry H. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Get highest element of a StringList
The loops is just an example because in my original post of why I wanted to get the highest element of a stringlist was because I wanted a for loop that wasn't as clumsy as For I:=0 to myStringlist.count-1 Do This came up because thanks to this discussion list, I learned I could use High() and Low() for my dynamic arrays, so I went through replacing all instances of Length(MyDynamicArray)-1 with High(MyDynamicArray) So my for loops went from: For I:=0 to Length(MyDynamicArray)-1 Do To For I:=0 to High(MyDynamicArray) Do Which I find much more clear and less prone to problems.. I have forgot the -1 before and it gives range check errors of course.. so I'm switching everything to use High() instead and will just automatically use High() in the future, thus preventing the issue all together. I'm really happy with the helper function and using MyStringList.High. I think .High should just be added to all things that have a .Count because everyone always needs it ALL THE TIME. But I am happy it's possible to add a helper function to add it myself. James >Why the loop? ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Why does nested function get corrupted?
Ondrej Pokorny via fpc-pascal schrieb am So., 11. Sep. 2022, 15:29: > Am 11.09.2022 um 14:22 schrieb Sven Barth via fpc-pascal: > > Ondrej Pokorny via fpc-pascal schrieb > am So., 11. Sep. 2022, 12:18: > >> Shouldn't this assignment be forbidden? >> >> type >> TProc = procedure is nested; >> function TestNested: TProc; >> begin >> result := procedure // why is this possible? >> begin >> writeln(data); >> end; >> >> It is not a nested function but an anonymous one. >> >> > And? An anonymous function is assignment compatible to multiple left sides > depending on what it captures. See my announcement mail. > > Thank you Sven - I missed this info in your email. > It's an extension I had done compared to Delphi so that anonymous functions are also usable without function references which are a bit more heavy weight after all. Regards, Sven > ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Why does nested function get corrupted?
Am 11.09.2022 um 14:22 schrieb Sven Barth via fpc-pascal: Ondrej Pokorny via fpc-pascal schrieb am So., 11. Sep. 2022, 12:18: Shouldn't this assignment be forbidden? type TProc = procedure is nested; function TestNested: TProc; begin result := procedure // why is this possible? begin writeln(data); end; It is not a nested function but an anonymous one. And? An anonymous function is assignment compatible to multiple left sides depending on what it captures. See my announcement mail. Thank you Sven - I missed this info in your email. Ondrej ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Why does nested function get corrupted?
Ondrej Pokorny via fpc-pascal schrieb am So., 11. Sep. 2022, 12:18: > Am 11.09.2022 um 11:26 schrieb Sven Barth via fpc-pascal: > > Hairy Pixels schrieb am Sa., 10. Sep. 2022, 03:21: > >> >> >> > On Sep 9, 2022, at 4:48 PM, Sven Barth >> wrote: >> > >> > How about you simply report such corruptions as bugs? I can always >> close them as "not a bug" or duplicate if necessary. >> > >> >> Well I thought the data may have been saved on the stack and thus lost >> when the function exits. What is the expected behavior for passing these >> outside of the calling scope? >> > > Looking at your example again - I'm only on my phone currently - it's > indeed your fault because the state passed to a nested function variable > does *not* survive the stack frame it belongs to. That's where function > references shine, because there the state *does* survive. > > Shouldn't this assignment be forbidden? > > type > TProc = procedure is nested; > function TestNested: TProc; > begin > result := procedure // why is this possible? > begin > writeln(data); > end; > > It is not a nested function but an anonymous one. > > And? An anonymous function is assignment compatible to multiple left sides depending on what it captures. See my announcement mail. Regards, Sven > ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Why does nested function get corrupted?
Am 11.09.2022 um 11:26 schrieb Sven Barth via fpc-pascal: Hairy Pixels schrieb am Sa., 10. Sep. 2022, 03:21: > On Sep 9, 2022, at 4:48 PM, Sven Barth wrote: > > How about you simply report such corruptions as bugs? I can always close them as "not a bug" or duplicate if necessary. > Well I thought the data may have been saved on the stack and thus lost when the function exits. What is the expected behavior for passing these outside of the calling scope? Looking at your example again - I'm only on my phone currently - it's indeed your fault because the state passed to a nested function variable does *not* survive the stack frame it belongs to. That's where function references shine, because there the state *does* survive. Shouldn't this assignment be forbidden? type TProc = procedure is nested; function TestNested: TProc; begin result := procedure // why is this possible? begin writeln(data); end; It is not a nested function but an anonymous one. Ondrej ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Get highest element of a StringList
James Richters via fpc-pascal schrieb am
Sa., 10. Sep. 2022, 22:55:
>
> For some reason
> {$Mode FPC}
> {$modeswitch typehelpers}
> Still had Error: Identifier not found "class"
>
Because support for the "class" keyword is only available when the
modeswitch Class is enabled which is the case for the ObjFPC and Delphi
modes.
You don't need the TypeHelpers mode switch for "class helper", only for
"type helper".
Regards,
Sven
>
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Re: [fpc-pascal] Why does nested function get corrupted?
Hairy Pixels schrieb am Sa., 10. Sep. 2022, 03:21: > > > > On Sep 9, 2022, at 4:48 PM, Sven Barth > wrote: > > > > How about you simply report such corruptions as bugs? I can always close > them as "not a bug" or duplicate if necessary. > > > > Well I thought the data may have been saved on the stack and thus lost > when the function exits. What is the expected behavior for passing these > outside of the calling scope? > Looking at your example again - I'm only on my phone currently - it's indeed your fault because the state passed to a nested function variable does *not* survive the stack frame it belongs to. That's where function references shine, because there the state *does* survive. Regards, Sven > ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Internal error 2019022201 from function reference
Hairy Pixels via fpc-pascal schrieb am Fr., 9. Sep. 2022, 18:05: > This program gives internal compiler error 2019022201 (Free Pascal > Compiler version 3.3.1 [2022/05/27] for aarch64). Something is wrong with > the PPU. This is a very basic program using function references so it > seems unlikely it could not be known. Any ideas? > Why do you think it's not known if there is an internal error? Internal errors are precisely there to cover cases that should not be taken, but are then triggered by some code path that was not thought about. As a general rule: always report an internal error if it wasn't reported already. If it was then check whether you can maybe provide a better example to reproduce it. Regards, Sven ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Shift key with PTCCRT
On 9/10/22 10:57 AM, James Richters wrote: Thanks for the suggestion I think the syntax should be: type myKeyEvent = IPTCKeyEvent; Var myShiftStatus : boolean; myShiftStatus := myKeyEvent.Shift; i told you i probably had the syntax wrong :lol: but I get IPTCKeyEvent not found. I wonder if it's only designated as internal.. or if I need to use something other than PTCGraph and PTCCRT you're probably not using the ptc unit directly so you can use it in your code... i don't like this documentation format without examples but it is what it is... https://ptcpas.sourceforge.io/api-reference/ptc/index-4.html also look here in procedure GetKeyEvents... https://github.com/alrieckert/freepascal/blob/master/packages/graph/src/ptcgraph/ptccrt.pp if you are already using PTC's keyevents, then you should be able to get the shift status already... i'm not even going to try writing any code this time... i don't have FPC or even TP/BP installed any more since i stopped writing code for fidonet stuff some years back ;) -- NOTE: No off-list assistance is given without prior approval. *Please keep mailing list traffic on the list where it belongs!* ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Get TMethod from function reference
Am 09.09.2022 um 00:49 schrieb Hairy Pixels via fpc-pascal: On Sep 8, 2022, at 11:14 AM, Michael Van Canneyt via fpc-pascal wrote: It must keep this information somewhere, but this does not mean you can typecast it to a TMethod. Indeed. I wonder if this information could be exposed by some method in the interface? It would be useful to introspect the target class like you can do with “of object”. See the announcement email from Sven to the fpc-pascal mailing list: https://lists.freepascal.org/pipermail/fpc-pascal/2022-May/060507.html They [function references] get their great power from a point that is for once *not* considered an implementation detail: function references are in fact internally declared as reference counted interfaces with a single Invoke() method of the provided signature. So the above examples are in fact declared like this: === code begin === type TProcLongInt = interface(IInterface) procedure Invoke(aArg: LongInt); stdcall; overload; end; You should be able to get the Invoke procedure pointer from the RTTI. Ondrej ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
