Poly/ML

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2 participants
711 discussions

Move to Subversion
by David.Matthews＠prolingua.co.uk 23 Mar '09

23 Mar '09

CVS is getting rather old now and most projects seem to have moved on. I've now moved Poly/ML's CVS repository to subversion and taken the opportunity to enable Trac on the SourceForge site. To download the development version you need svn co https://polyml.svn.sourceforge.net/svnroot/polyml/trunk polyml The subversion repository contains all the CVS history so I'll be disabling CVS shortly. There's quite a bit of work going on with the compiler at the moment with a view to providing much better support for development environments. There's work to make this available in Isabelle and Lucas Dixon is looking at a plug-in for jEdit. There'll be more news as we get things properly working. David.

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Universal binaries
by aleks0＠gmail.com 16 Mar '09

16 Mar '09

Anyone had luck (or know where to begin for...) getting poly/ML to export mac universal binary? I guess a more general question is, can poly/ML make *.o files for a different architecture than the one it is running on?

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Installing Poly/ML
by rda＠lemma-one.com 02 Mar '09

02 Mar '09

I have just learnt a few things installing Poly/ML on a Ubuntu 8.04 system freshly built from the Desktop CD: 1) Ubuntu comes out of the CD with 3/4 of a C compiler. You get gcc, but not libc, so you can compile hello-world.c but not link or run it. The configure script notices this. Installing the package libc6-dev fixes it. 2) But, the configure script doesn't seem to check that there is a C++ compiler (perhaps it should???). The output from configure looked OK, but make fell over with an error: ../libtool: line 1281: g++: command not found Installing the package g++ fixes this. 3) But, poly builds and installs but won't run, because Ubuntu is one of those systems that doesn't include /usr/local/lib on the library path, After starting again with "./configure --prefix=/usr", I have a working compiler. Regards, Rob.

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ML compiler
by ldixon＠inf.ed.ac.uk 06 Feb '09

06 Feb '09

Hi PolyML people, I'm interested in trying to shrink the size of my binary/heap file; I have 18604 lines of library code; the first 6922 lines give a 2.6 MB heap; the next 1200 lines on top of this give a 15 MB heap. I then have 7500 lines of program that push the heap up to 138 MB. (on some Linux' this becomes over 200MB!) I'm doing garbage collection before writing the heap (although it sounds like this is now done automatically); and I can't quite tell how I'm getting this rather nasty blow up in heap size. I suspect my use of substructures, I often have things like: signature N1 ... signature N2 = sig structure n1 : N1 ... end functor N2Fun(n1 : N1 and ...) : N2 = struct structure n1 = n1; ... end; structure n1 : N1 = ... structure n2a = functor(n1 : N1 and ...) : N2; structure n2b = functor(n1 : N1 and ...) : N2; is the code for the substructure n1 literally getting copied each time? Even with this I find it hard to imagine how I'd generate 120 MB of machine code from 7500 lines of ML... I noticed some forget functions in the PolyML compiler; is there some clever way to say all I care about is stuff reachable from calling some specified function? suggestions very welcome, best, lucas

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Updates in CVS
by David.Matthews＠prolingua.co.uk 29 Jan '09

29 Jan '09

There have been a couple of updates to the Poly/ML CVS repository recently apart from those already mentioned on the list. They are both in the C++ run-time system. The mechanism for waiting for external events has been improved which mainly affects Windows pipes and processes. In particular Windows.execute is now much faster when reading from a pipe. I noticed some strange warning messages when building Poly/ML on Cygwin on a new machine of the form "Warning: linker path does not have real file for library -lXXX" It turned out that this was as a result of not having installed the "file" package (/usr/bin/file) rather than anything to do with Poly/ML. Installing this fixed the problem so I've added a test in the configure script which checks for the presence of /usr/bin/file when compiling on Cygwin and produces a more explanatory message if it's not there. David

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Incorrect value for IntInf.pow (~1, ~n) for n = 1, 2, 4, 6, 8 etc.
by pclayton＠taz.qinetiq.com 17 Jan '09

17 Jan '09

In my ignorance I wrote my own exponentiation function for infinite integers, only to find IntInf.pow exists in the basis. Anyway, I ran my test cases on IntInf.pow but they didn't all pass... The following tests should be true but return false: val test = IntInf.pow; test (~1, ~1000000) = 1; test (~1, ~8) = 1; test (~1, ~6) = 1; test (~1, ~4) = 1; test (~1, ~2) = 1; test (~1, ~1) = ~1; It looks like Int.quot(j, 2) on line 117 of basis/IntInf.sml should be Int.rem(j, 2) or possibly andb(j, 1) (as in the local function power). Phil The information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). The information in this communication may be confidential and/or legally privileged. Nothing in this e-mail is intended to conclude a contract on behalf of QinetiQ or make QinetiQ subject to any other legally binding commitments, unless the e-mail contains an express statement to the contrary or incorporates a formal Purchase Order. For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful. Emails and other electronic communication with QinetiQ may be monitored and recorded for business purposes including security, audit and archival purposes. Any response to this email indicates consent to this. Telephone calls to QinetiQ may be monitored or recorded for quality control, security and other business purposes. QinetiQ Limited Registered in England & Wales: Company Number:3796233 Registered office: 85 Buckingham Gate, London SW1E 6PD, United Kingdom Trading address: Cody Technology Park, Cody Building, Ively Road, Farnborough, Hampshire, GU14 0LX, United Kingdom http://www.qinetiq.com/home/notices/legal.html

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loadState and threads
by pclayton＠taz.qinetiq.com 03 Dec '08

03 Dec '08

Does anyone know what should happen to threads (created with Thread.Thread.fork) when PolyML.SaveState.loadState is performed? It appears that they are no longer reported as active but, despite this, carry on running. Is it up to the user to kill these before doing a loadState? Thanks, Phil The information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). The information in this communication may be confidential and/or legally privileged. Nothing in this e-mail is intended to conclude a contract on behalf of QinetiQ or make QinetiQ subject to any other legally binding commitments, unless the e-mail contains an express statement to the contrary or incorporates a formal Purchase Order. For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful. Emails and other electronic communication with QinetiQ may be monitored and recorded for business purposes including security, audit and archival purposes. Any response to this email indicates consent to this. Telephone calls to QinetiQ may be monitored or recorded for quality control, security and other business purposes. QinetiQ Limited Registered in England & Wales: Company Number:3796233 Registered office: 85 Buckingham Gate, London SW1E 6PD, United Kingdom Trading address: Cody Technology Park, Cody Building, Ively Road, Farnborough, Hampshire, GU14 0LX, United Kingdom http://www.qinetiq.com/home/notices/legal.html

3 7

printing out references
by Michael.Norrish＠nicta.com.au 28 Nov '08

28 Nov '08

How can I prettyprint a reference value so that I get some idea from looking at the output whether two such values are the same or not? I have a data type that is littered with various references, and the default pretty-printer only gives me strings with "ref" through them. If I have "ref 1" in one place and "ref 1" in another, I have no idea whether or not these are the same references. If I want to handle this situation in pure SML, it seems as if I'd have to maintain a global list of seen references and look each reference up by doing a linear search through the list. This is pretty awful. Even if there was a Ref.compare function so that I could avoid linear search, the table would still need to be global so that successive pretty-prints would continue to make sense with respect to each other. In Moscow ML there is an Obj.magic function that will turn anything into anything, and in particular seems happy to turn a ref into an integer. Is there something comparable in Poly/ML? (I browsed the poly sources in a very cursory fashion and discovered RunCall.unsafeCast, but this either gave me a segmentation fault, or seemed to be looking at the values at the other ends of the references when I applied it to them.) Michael.

2 1

Unable to allocate immutable area
by thomas.ridge＠cl.cam.ac.uk 18 Nov '08

18 Nov '08

Dear All, I am using polyml to run hol. >From within emacs, I normally use "C-c C-r" to send a region to the hol process. This involves emacs writing out to a tmp file, and the hol process attempting to "use" the file back in. After a lot of proof, I get the following error: "Unable to allocate immutable area" which occurs in the "use" command. Immediately after the above error, I get the following two lines: eg Failed to translate file: /tmp/sml26128UHN Exception- Fail "use" raised The result is that I can no longer use "C-c C-r" to send a file (nor, presumably, "use" any other file). I can still cut and paste into the hol process buffer. What does the error mean? Can I do anything to improve things? Thanks Tom

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obscure segfault
by krauss＠in.tum.de 18 Nov '08

18 Nov '08

Dear list, The following code leads to a segmentation fault when fed into polyml: fun REPEAT t r c = REPEAT t c (t r c); fun I x = x; fun f r c n = if n <= 0 then r n else c n; fun g x = REPEAT f I I x; g 0; The code really doesn't make any sense... but assuming that polyml should never segfault, this must be a bug. Any ideas why this occurs? Does it have to do with the value restriction in some form? Thanks, Alex

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Poly/ML