Poly/ML

polyml@lists.polyml.org

2 participants
711 discussions

polyc
by rda＠lemma-one.com 10 May '14

10 May '14

I have a couple of comments and a query about polyc (which seemed particularly attractive on Cygwin, where there seems to be quite a long list of libraries you need to know about if you are going to call the linker directly). The comment is that the help text is a bit misleading as it has more functionality than just compiling and linking a source file, e.g., you can pass it the name of an object file and it will link it with libpolymain and libpolyml. The query relates to the fact that polyc doesn?t do anything with LD_RUN_PATH (or DYLD_LIBRARY_PATH on Mac OS). Am I right in thinking that libpolyml will now always be statically linked so that you no longer to need to tell the dynamic linker where to find it? (For Poly/ML versions 5.5 and earlier the ProofPower makefiles that I am updating used to create an executable that linked libpolyml dynamically.) Regards, Rob.

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Summer School on Advances in Programming Langauges
by eb120＠hw.ac.uk 14 Apr '14

14 Apr '14

Dear all, Find below the call for applications to attend the AiPL'14 Summer School. Apologies for multiple postings. =================================================== 2nd International Summer School on Advances in Programming Languages 19-22 August 2014, Heriot-Watt University, Edinburgh The 2nd International Summer School on Advances in Programming Languages offers four days of insightful lectures and lab sessions on an engaging blend of cutting-edge theoretical and practical techniques delivered by international experts. The topics include type systems and dependent types, novel programming models, and domain-specific languages, among others. The School is primarily intended for postgraduate research students and aims to foster international collaboration, and encourages a dialogue among early career researchers and renowned scientists. Important Dates: Application deadline: 30 April 2014 Notification: 15 May 2014 Speakers: Philip Wadler, University of Edinburgh Jeremy Gibbons, University of Oxford Fritz Henglein, DIKU, University of Copenhagen Rita Loogen, Philipps-Universit?t Marburg Hans Vandierendonck, Queen's University Belfast Jeremy Singer, University of Glasgow Conor McBride, University of Strathclyde Michele Weiland, Edinburgh Parallel Computing Centre Sven-Bodo Scholz, Heriot-Watt University Edinburgh Greg Michaelson, Heriot-Watt University Edinburgh Cost: 550 GBP - residential 350 GBP - no accommodation included Futher information is available at: http://www.macs.hw.ac.uk/~dsg/events/ISS-AiPL-2014/ =================================================== Evgenij on behalf of the AiPL'14 Organising Committee

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Incorrect floating point conversion
by fw＠deneb.enyo.de 24 Mar '14

24 Mar '14

I noticed this: Poly/ML 5.5.1 Development > val a = 0.99999999999999972244424384371086489409208297729492187;; val a = 1.0: real > val b = 0.999999999999999722444243843710864894092082977294921876;; val b = 1.0: real > a < b;; val it = false: bool > a > b;; val it = false: bool So both values are equal according to Poly/ML. But the correct conversion for the first one is (in hexadecimal floating point notation) 0x1.ffffffffffffdp-1, and for the second 0x1.ffffffffffffep-1, so the values should be different.

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[isabelle-dev] PolyML crashes
by michael.norrish＠nicta.com.au 03 Mar '14

03 Mar '14

I seem to be able to pretty reliably produce the following: Exception- InternalError: indirect - invalid constant address raised while compiling Exception- InternalError: indirect - invalid constant address raised while compiling Unfortunately, it takes hours to get there... Switching to --gcthreads=1 may have fixed another error we were having, relating to unwarranted pointer-equality tests. Michael On 21/02/14 22:30, David Matthews wrote: > Hi, > I'm aware of a number of assertion failures that seem to occur intermittently. > This is one of the ones on my list. I suspect they are all symptoms of the same > bug but I have never been able to narrow it down or reproduce it. It does seem > to occur when the memory management is under heavy load. > > Thanks for reporting it and if anyone manages to reproduce it more consistently > I would be very interested. > > Regards, > David > > On 20/02/2014 14:21, Ond?ej Kun?ar wrote: >> Hi! >> In the past couple of months I've gotten a crash of PolyML always with >> the same error message. I cannot reproduce the problem reliably but >> because it has already happened, let say, six times in the past three >> months, I am reporting the problem here: >> >> Unofficial version of Isabelle/HOL (unidentified repository version) >> poly: gc_mark_phase.cpp:432: virtual void >> MTGCProcessMarkPointers::ScanAddressesInObject(PolyObject*, >> POLYUNSIGNED): Assertion `baseAddr > (PolyWord*)obj && baseAddr < >> ((PolyWord*)obj)+length' failed. >> >> >> This refers to any changeset in the past three months. >> >> Best, >> Ondrej >> _______________________________________________ >> isabelle-dev mailing list >> isabelle-dev at in.tum.de >> https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev > _______________________________________________ > isabelle-dev mailing list > isabelle-dev at in.tum.de > https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev

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(Pseudo) static linking with C
by list.2006＠nul.jp 19 Feb '14

19 Feb '14

Hi, Although Poly/ML has nice interface for calling C functions, it only supports dynamic linking. <http://www.polyml.org/docs/CInterface.html> This is not pleasant if you want to distribute a program as a simple stand-alone executable. (setting the library path might be crumsy for the user) A solution would be 'linking statically but loading dynamically.' Actually, dlopen seems to support this if the filename argument is NULL. The following experiment (on Ubuntu 13.04 x86_64) seems to have succeeded, but needs a little modification to Poly/ML. How do you think? Any chance for Poly/ML to incorporate something similar? Best regards, -- KOBAYASHI, Tomoyas ===== patch ===== --- foreign.cpp.orig 2014-02-15 00:29:32.334802335 +0900 +++ foreign.cpp 2014-02-15 00:35:58.362818505 +0900 @@ -742,7 +742,7 @@ return res; #else /* UNIX version */ - void *lib = dlopen(name,DLOPENFLAGS); + void *lib = dlopen(*name == 0 ? NULL : name,DLOPENFLAGS); if (!lib) { char buf[256]; ===== experiment session ===== $ cat difference.c int difference (int x, int y) { return x > y ? x - y : y - x; } $ gcc -c difference.c -fPIC -o difference.o $ cat diff.sml local open CInterface in fun diff (n, m) = let val lib = load_lib "" val sym = load_sym lib "difference" val diff' = call2 sym (INT, INT) INT in diff' (n, m) end fun main () = print (Int.toString (diff (13, 50)) ^ "\n"); end $ poly Poly/ML 5.5.2 Testing > use "diff.sml"; val diff = fn: int * int -> int val main = fn: unit -> unit val it = (): unit > PolyML.export("diff.o", main); val it = (): unit > $ gcc -L ~/poly/lib -rdynamic diff.o difference.o -lpolymain -lpolyml -lstdc++ -lm -ldl -lpthread -lgmp $ ./a.out 37 $

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Subsecond time in stat structures
by loganjerry＠gmail.com 18 Feb '14

18 Feb '14

I would like to propose a patch to PolyML (attached) that uses subsecond time fields in stat structures, when they are available. I think the patch is fairly straightforward. When I changed configure.ac by adding the AC_CHECK_MEMBERS macro, autoconf started whining at me about AC_CANONICAL_HOST being obsolete. Then it turned out that its replacement, AC_CANONICAL_TARGET, must appear before AM_INIT_AUTOMAKE, hence the slight rearrangement of macro calls there. Ignore that part if you like AC_CANONICAL_HOST. I am not sure of the best place to put the STAT_SECS and STAT_USECS macros. They seemed to me to be somewhat related to other definitions in io_internal.h, but perhaps there is a better place to put them. Anyway, this is more a proof of concept than a finished product. Feel free to mangle it to your heart's content. I won't be offended. :-) Regards, -- Jerry James http://www.jamezone.org/

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Exception- Subscript unexpectedly raised while compiling
by noschinl＠in.tum.de 17 Feb '14

17 Feb '14

Hi everyone, today I stumbled upon some strange behaviour of PolyML 5.5.1 (the x86-linux version shipped with Isabelle). The behaviour also occurred with revision 1874 from the SVN (Sourceforge has problems at the moment, so I didn't test the most current version). ------------------------------------------------------ # ./poly Poly/ML 5.5.1 Release > fun f xs = (xs : ''a) val _ = (fn x => f x); Exception- Subscript unexpectedly raised while compiling Exception- Subscript unexpectedly raised while compiling ------------------------------------------------------ But: ------------------------------------------------------ # ./poly Poly/ML 5.5.1 Release > fun f xs = (xs : ''a); val _ = (fn x => f x); val f = fn: ''a -> ''a ------------------------------------------------------ But: ------------------------------------------------------ # ./poly Poly/ML 5.5.1 Release > let fun f xs = (xs : ''a); val _ = (fn x => f x) in () end; Exception- Subscript unexpectedly raised while compiling Exception- Subscript unexpectedly raised while compiling ------------------------------------------------------ So the error vanishes, if I add a semicolon before the "val", except when I am in a "let" block. Moreover, the error seems to depend on the equality type and the dummy pattern. Best regards, Lars

2 2

printInAlphabeticalOrder
by rda＠lemma-one.com 13 Feb '14

13 Feb '14

I am confused about what PolyML.Compiler.printInAlphabeticalOrder is intended to control. If I enter the following: signature S = sig val x : int val z : int val y : int end; structure S = struct val x = 1 val z = 3 val y = 2 end; the signature and the structure are both printed with the variables in reverse alphabetical order. (I was rather hoping for an option to have them in the source code order.) Regards, Rob.

2 1

Pretty-printing infix constructors
by Rda＠lemma-one.com 06 Feb '14

06 Feb '14

When I executed the following infix xxx; datatype XXX = op xxx of int * string; 1 xxx "banana"; I was rather hopping the expression at the end would print out with infix notation but it doesn't: val it = xxx (1, "banana"): XXX Is there an option in Poly/ML to have infix constructors print as infixes, or do I need to write my own pretty-printer to get that. Regards, Rob.

2 1

PolyML.pointerEq
by Brian.Campbell＠ed.ac.uk 05 Feb '14

05 Feb '14

What semantics, if any, does PolyML.pointerEq have? In particular, is it supposed to be guaranteed that if pointerEq (x,y) is true, then it will remain true after GC? My reason for asking is that I've been having trouble with assertion failures in HOL when reducing large terms. The assertions check that the left hand side of the conclusions of two theorem objects are equal according to pointerEq, because this allows a fast comparison that "should" always be true if the theorem is manipulated carefully. I'm fairly certain the assertion failures are related to GC: they are non-deterministic on code that ought to be deterministic, and vary in frequency across different machines. (I haven't seen it at all on a 4GB 32-bit machine, rarely on 4GB 64-bit, often on the 8GB I normally use and infrequently on a compute server with much more.) There's no sign of any data corruption, however. Brian

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