Poly/ML

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720 discussions

checking --enable-shared from within the REPL
by michael.norrish＠nicta.com.au 13 Jan '14

13 Jan '14

Is there any way to detect if the system has been built with --enable-shared? Something in the PolyML structure (say)? I'd like to be able to have my build script abort if the PolyML hasn't been built correctly. Or is there anything obvious my script could check in the file system to make this determination? Thanks, Michael

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excessive compile times?
by Michael.Norrish＠nicta.com.au 10 Dec '13

10 Dec '13

A minimally modified version of the file at https://raw.github.com/mn200/HOL/master/src/bool/boolScript.sml takes 83 seconds to be ?used? (using PolyML.use) into an interactive PolyML session. There are a great many files that need to be used before boolScript gets to work, but none of those files need any longer than 2seconds to be used, and the vast majority take less than a second. The "minimal modifications? turn the ``?`` syntax into valid SML, such that ``p /\ q`` turns into (Term [QUOTE ?p /\\ q?]) and turns `p /\ q` into [QUOTE ?p /\\ q?] We have a timer that starts when the script file actually begins to execute, and this reports that the execution time is less than a second, so it really does seem as if the compilation time is the issue. We have many other Script files in HOL4 that are at least this long, but they don?t have slow compilation times in the same way. Also, the much smaller (30 times by LoC) https://raw.github.com/mn200/HOL/master/src/1/ConseqConvScript.sml has the same prefix as boolScript, but compiles in less than a second. Is there anything obvious (and remediable) that boolScript is doing that might be causing this problem? FWIW, Moscow ML compiles this file as quickly as all the others in the system. Thanks, Michael ________________________________ The information in this e-mail may be confidential and subject to legal professional privilege and/or copyright. National ICT Australia Limited accepts no liability for any damage caused by this email or its attachments.

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Flexible records and overloading
by David.Matthews＠prolingua.co.uk 01 Dec '13

01 Dec '13

The ML standard is not specific about what the "program context" should be when disambiguating flexible records and overloading. Poly/ML uses as wide a context as possible but that can mean that a program that compiles with Poly/ML won't necessarily compile with other implementations. I've added a switch PolyML.Compiler.narrowOverloadFlexRecord that defaults to false. If set to true the compiler uses a much narrower context; essentially the val binding. I've looked at a few other implementations to see what they do. The most restrictive is Hamlet which corresponds to what Poly/ML now does with narrowOverloadFlexRecord set to true. It rejects let fun f x y = x + y in f 1.0 end; which SML/NJ (110.74) accepts. Neither accept let fun f {x, ...} = x in f {x=1} end; Mlton seems to use the whole program context as Poly/ML does. David

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Id like to suggest porting to Android
by monkeyrater＠hotmail.com 18 Nov '13

18 Nov '13

There are a couple of implementations for Ocaml on Android but none for SML. So Id like to suggest that you make a port for Android because mobile computing is becoming much more common and mainstream. And also the fact that Android OS is a much more stable target to port to compared to the fragmentation of Linux distros, the exclusivity of hardware costs and availability for OSX and the problems that windows 8 is bringing to user experience. -Brad Cantrell

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managing compilation
by gbuday＠karolyrobert.hu 20 Oct '13

20 Oct '13

Hi, I am looking for a method of managing compilation for Poly/ML, like .cm files for SML/NJ and .mlb files for MLton. What I have found on polyml.org was PolyML.make -- is that the last word on this subject? - Gergely

2 1

Poly/ML 5.5.1
by David.Matthews＠prolingua.co.uk 16 Oct '13

16 Oct '13

I have uploaded the source for Poly/ML 5.5.1 to the SourceForge site so it is now officially released. I still need to create installers for Windows. The release notes at http://www.polyml.org/docs/ReleaseNotes.html give a general overview of the changes over the last year. There have been no big changes which is the reason it's 5.5.1 rather than 5.6. David

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response to PolyML on Android and iOS thread
by monkeyrater＠hotmail.com 16 Oct '13

16 Oct '13

Sorry for making this response in a new thread, but as I am not a member of the mailing list this is the only way as this being a mailing list, everything is automatically sent instead of being able to edit material in a central location. Id also like to say its an honor to have David Mathews respond to my thread. >I'm not exactly clear about the motivation behind the question. I mentioned in my original post what my motivation is but I will state it again in more detail. Windows is no longer a viable scientific computing platform as Microsoft have gone out of their way to take away user control of how software can be installed and accessed and trying to move toward 'cloud based services' type of user experience. Linux definately allows control but is so fragmented by many different distros that its impossible to port a unified system. And OSX requires the purchase of its own expensive hardware to run on. Furthermore mobile computing is no longer a weak subset of the capabilities of PC computing but equal processor power and memory capacity exists to run equally complex software. However one could argue that mobile platforms are not ready yet due to the fact that they only run on phone or tablet from factor. Although it is possible to use a wireless keyboard with a tablet, what is really required is a netbook form factor such as the Chromebooks. Unfortunately Google has dropped the ball by creating the ChromeOS operating system that only runs 'web apps', trying to force cloud computing on its users like Microsoft is with win 8. >OCAML implementations seem to provide a small console window that allows >someone to enter and run OCAML programs. I don't know how useful that >would be in general. It might be more useful to be able to create >little ML programs. Without a linker it wouldn't be possible to create >stand-alone binaries but it might be possible to create scripts. It might be possible to include the Tiny C compiler http://bellard.org/tcc/ to create binaries. I know this sounds frivolous to go to the trouble of doing this, but it shouldnt be too difficult for any programmer who is experienced with Android programming to do this kind of port. Im sorry to take up too much of your time with this idea, Im sure you probably have more important things to concern yourselves with. But I believe that the ML family of languages are going to become much more popular in place of other functional languages like Haskell or Scala which both bring limitations that prevent adoption for general use. And I would hate to see SML lose out simply because it is not as accessible as Ocaml. Mobile computing is the future and so far Android is the most viable platform for it. Id also like to mention this class: https://www.coursera.org/course/proglang that has attracted tens of thousands of online students and will do a lot to raise awareness of ML's advantages over other functional languages. -Brad Cantrell

2 1

Compiler in SVN
by David.Matthews＠prolingua.co.uk 03 Sep '13

03 Sep '13

There's been quite a lot of work on the intermediate code optimiser since the last release and it's largely been rewritten. The main aim has been to reduce the number of cases where heap storage was allocated for argument tuples or closures. There were a number of bugs that appeared during testing but I'm not aware of anything outstanding. Isabelle2013 and HOL4 both seem to build successfully and there does seem to be some speed-up. I'd like to release this version in the next month or so but I'd like to fix any other bugs that have been introduced. Please try out the SVN version and let me know how it goes. Don't forget that after the configure and make steps you need to run "make compiler" at least once and preferably twice. Otherwise you will still be using the 5.5 compiler. David

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Warning building Poly/ML on Mac OS X
by rda＠lemma-one.com 01 Sep '13

01 Sep '13

I just built Poly/ML from the latest sources in SVN on Mac OS X 10.8.4 and got the following warning: /bin/sh ./libtool --tag=CC --mode=link gcc -DMACOSX -Wall -fno-strict-aliasing -O3 -I../libffi/include -o poly polyexport.o libpolymain/libpolymain.la libpolyml/libpolyml.la -lpthread -lm -ldl -lstdc++ -lgcc libtool: link: gcc -DMACOSX -Wall -fno-strict-aliasing -O3 -I../libffi/include -o poly polyexport.o libpolymain/.libs/libpolymain.a libpolyml/.libs/libpolyml.a -lpthread -lm -ldl -lstdc++ -lgcc ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame ld: warning: PIE disabled. Absolute addressing (perhaps -mdynamic-no-pic) not allowed in code signed PIE, but used in area1 from polyexport.o. To fix this warning, don't compile with -mdynamic-no-pic or link with -Wl,-no_pie I don't have any problems running Poly/ML after this, but I wondered if it was something that somebody somewhere might care about. Regards, Rob.

1 0

pretty printing infrastructure
by Michael.Norrish＠nicta.com.au 28 Aug '13

28 Aug '13

First a feature request: could we please have a version of the basic function for adding a string that takes an optional argument indicating how wide the Oppen algorithm should treat the string? At the moment, the infrastructure just seems to count the bytes emitted, and this causes premature line breaks if I'm emitting UTF-8 characters. Of course, if the infrastructure could magically become aware of UTF-8 or wide characters that would solve this particular use-case, but I'd still ask for this feature because I also want to emit byte-sequences that are terminal control codes. (On appropriate terminals, I emit vt100 codes to colour certain substrings, for example.) Secondly, I'm a bit concerned that the new, recommended approach to pretty-printing requires me to translate into the Pretty structure before anything happens. I'd feel more comfortable if the structure could be produced and consumed lazily so that I don't end up with a large (strictly unnecessary) Pretty structure in memory. Michael ________________________________ The information in this e-mail may be confidential and subject to legal professional privilege and/or copyright. National ICT Australia Limited accepts no liability for any damage caused by this email or its attachments.

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