Poly/ML

polyml@lists.polyml.org

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711 discussions

Future of the mailing list
by David.Matthews＠prolingua.co.uk 17 Apr '25

17 Apr '25

I've had a message from the administrators at Edinburgh Informatics to say that as from 1st June they will no longer be supporting the mailing list that we've had since 2002. The list is not very active but it is useful from time to time so it would be good to keep it going. Does anyone have any suggestions as to where it could be hosted? I do have a VPS running Debian that currently hosts the Poly/ML website so that is a possibility. Regards, David

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Very slow type checking with largish/nested type abbreviations
by kevin.kappelmann＠tum.de 13 Apr '25

13 Apr '25

Dear list, I am facing very slow type checking in a development of mine (in Isabelle), possibly due to largish types created by nested type abbreviations. The type checking of these types is significantly faster in MLton and SML/NJ. I hence wanted to ask if there is any hope that type checking performance for such cases could be improved in Poly/ML (with reasonable effort)? Attached, you can find 2 short files that demonstrate this. Both files create nested type abbreviations and a function "foo" that uses these types. In test_check.sml, one of the types has to be checked against itself. In test_compare.sml, two equal types have to be compared to each other. Times on an Apple M3 machine: - test_check.sml: - polyml-5.9.1/arm64_32-darwin: 13.043 seconds (command: "poly < test_check.sml") - SML/NJ Version 110.99.7; 64-bit: 0.161 seconds (command: "sml < test_check.sml") - MLton Version 20241230: 1.201 seconds (command: "mlton test_check.sml") - test_check.sml when changing "foo" to use type "test4" instead of "test3_4" (cf. source file) - polyml-5.9.1/arm64_32-darwin: TIMEOUT after 10 minutes - SML/NJ Version 110.99.7; 64-bit: 0.398 seconds - MLton Version 20241230: 1.249 seconds - test_compare.sml: - polyml-5.9.1/arm64_32-darwin: 13.369 seconds - SML/NJ Version 110.99.7; 64-bit: 0.178 seconds - MLton Version 20241230: 1.221 seconds Best wishes, Kevin

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Foreign functions
by gbuday＠gmail.com 05 Mar '25

05 Mar '25

Hi there, I have found only the signature FOREIGN: https://artemis.polyml.org/documentation/Reference/Foreign.xml but is there an explanation for this somewhere? - Gergely

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Scripting on Windows
by gbuday＠gmail.com 27 Feb '25

27 Feb '25

Hi there, it is possible to create a standalone script on Unices: #!/home/user/polyml-5.9/bin/poly --script print "Hello World!\n" But the Windows executable creates a window. Is it possible to compile a Poly/ML read-eval-print loop that I could start in a cmd window? My goal would be to write standalone scripts for Windows. - Gergely

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Thread.ConditionVar.waitUntil
by rda＠lemma-one.com 10 Jan '25

10 Jan '25

Happy New Year to the Poly/ML User Community! I am trying to find a fix to a problem where we want to apply a function that sometimes takes far too long to execute. So I want to abort execution of the function after a specified time limit. I have a solution that seems to work by forking a worker thread to execute the function and store the result in a ref while the control thread goes into a loop that waits for 100ms and then either (1) returns the result from the ref if the worker thread is no longer active, (2) repeats if the thread is still active and we haven?t reaced the time limit or otherwise (3) kills the worker thread and returns a dummy value. I am implementing this using Thread.ConditionVar.waitUntil and have two questions about that: 1) What does the bool returned by Thread.ConditionVar.waitUntil mean? That doesn?t seem to be documented. 2) In addition to the timeout, Thread.ConditionVar.waitUntil has a condition variable and a mutex as arguments. I am just creating these using Thread.ConditionVar.conditionVar and Thread.Mutex.mutex because I need some values to pass to Thread.ConditionVar.waitUntil. I am not doing any signalling or locking or unlocking. Is that going to cause any problems? (The condition variable and the mutex are local to the control thread function, so the worker thread function has no access to them.) Regards, Rob.

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Pretty-printing of infix operators
by rda＠lemma-one.com 03 Nov '24

03 Nov '24

Dear All, I am trying re-use some demo code that I wrote some years ago and am getting different output from what I previously got. A cut-down version of the code is as follows: local datatype THEOREM = D of (int * int); in type THEOREM = THEOREM; infix D; fun axiom m = if m <> 0 then m D m else raise NOT_ALLOWED; end; axiom 1; The output I used to get was: infix 0 D eqtype THEOREM val axiom = fn: int -> THEOREM val it = 1 D 1: THEOREM The output I now get is: infix 0 D eqtype THEOREM val axiom = fn: int -> THEOREM val it = D (1, 1): THEOREM Can I do something to persuade the pretty-printer to use infix notation for the constructor D? (In a real application, I would install my own pretty-printer for the type THEOREM, but that would be an annoying distraction in the talk that the demo code accompanies.) Regards, Rob.

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Is the list still up and running?
by rda＠lemma-one.com 03 Sep '24

03 Sep '24

Dear All, As the subject line says, is the Poly/ML list still up and running? The website for the list is still there at https://lists.inf.ed.ac.uk/mailman/listinfo/polyml, but the link to the archives at https://lists.inf.ed.ac.uk/pipermail/polyml/ is is broken. Cheers, Rob.

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PolyML 5.9.1 build failure on Mac Sonoma arm64
by steve.arons＠gmail.com 23 Feb '24

23 Feb '24

The linker fails when writing the object code: ******Writing object code****** /bin/sh ./libtool --tag=CC --mode=link gcc -O3 -o poly polyexport.o libpolymain/libpolymain.la libpolyml/libpolyml.la -lstdc++ libtool: link: gcc -O3 -o .libs/poly polyexport.o libpolymain/.libs/libpolymain.a libpolyml/.libs/libpolyml.dylib -lstdc++ ld: LINKEDIT overlap of start of LINKEDIT and symbol table in '/Users/susanbeningson/poly/polyml/polyexport.o' in '/Users/susanbeningson/poly/polyml/polyexport.o' clang: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [poly] Error 1 make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2 This is clang from the Apple dev tools masquerading as gcc; is it necessary to use GNU gcc and the GNU bin tools? Thanks, Steve

2 4

Poly/ML 5.9.1
by andrewgoh95＠yahoo.com.sg 22 Jan '24

22 Jan '24

Hi Poly/ML List members, I am starting to pick up the Poly/ML language by relying on SML/NJ resources. Do you have any free pdf tutorials that you can recommend and that I can obtain.? As the latest Poly/ML 5.9.1 version is not available for Windows, I however managed to obtain a previous version 5.5.0 from source forge.? I was wondering if Poly/ML can be improved until it looks like, feels like and works like a copy of the Python IDLE IDE. Thanks and Regards, --- Andrew Goh

5 4

How to build a new backend?
by andrei.formiga＠gmail.com 24 Nov '23

24 Nov '23

Hello, Let's say I want to create a new backend for Poly/ML, generating code for a virtual machine, for example the Erlang BEAM Virtual Machine. The backend would not depend on the C++ runtime, because the runtime would be the virtual machine. >From looking at the source code, the backend should generate target code from the CodeTree. I could add a new directory to MLCompiler/CodeTree with the new backend code, and add a GCode.beam.ML file to the MLCompiler directory that instantiates the GCode structure correctly. My question is about building the compiler with the new backend enabled. How would I add the new backend to the build and then build the compiler with this backend enabled? I have limited experience with autoconf and automake (mainly as a user), so taking a look at configure.ac and Makefile.am didn't give me clues on how to tie everything together. I also see that there is a RootXX.ML file for each target architecture that compiles the source files in order, but a comment in these files say they were generated from the make files. So any tips or pointers are appreciated. -- []s, Andrei Formiga

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