Poly/ML April 2012

polyml@lists.polyml.org

5 participants
5 discussions

Inspecting structures
by ramana.kumar＠gmail.com 27 Jan '16

27 Jan '16

Is there a way to look at the contents (i.e. signature) of a structure without opening it? (I suppose you could just open it then call a lot of PolyML.Compiler.forgetXXX, but that's quite tedious) Also, is it possible to retrieve the long path of an identifier in scope? Something that will, for example, take the rev in scope and say that it came from List. Finally, what about searching for an identifier that would come into scope if you opened some structures?

3 5

[Fwd: Re: [polyml] Building Poly/ML on MacOS X 10.6]
by rda＠lemma-one.com 29 Dec '14

29 Dec '14

I wrote: > I am completely baffled. I thought I hada solved all my problems on > MacOS X > 10.6 and was just tidying up, when I had to recompile a 32 bit > version of > Poly/ML to test a tidied up make file. This failed because > PolyML.Compiler.printTypesWithStructureName no longer exists. The same > problem happened when i rebuild a 64 bit version. What has happened? but it was a false alarm: my make file was wrong for other reasons and the absence of PolyML.Compiler.printTypesWithStructureName was not relevant. No doubt there are good reasons why this variable has been withdrawn. Regards, Rob.

3 6

Lifespan of pointers to callback functions passed via C FFI
by phil.clayton＠lineone.net 13 Aug '12

13 Aug '12

I have been assuming that the pointer back to an ML function passed to a foreign C function will still be valid after the C function has returned, so the callback can occur sometime later (from a different C function). Is that a valid assumption? I made this assumption based on some tests in which one such callback pointer remained valid for the life of the application. It would be nice to know I wasn't just being (un)lucky! Phil

2 5

gcbench in SML
by Jeremy.Singer＠glasgow.ac.uk 06 May '12

06 May '12

Hi David, I am trying to create something like Hans Boehm's GC benchmark - http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_bench.html in SML. My current attempt is at: http://pastebin.com/2RW9jpCJ Sorry - I forgot all my ML years ago. Here are some things I'm not sure how to do nicely in Poly/ML: * printf without lots of String.concat * is there a runtime API call to get the totalMem (current heap size?) and the free mem (currently unused blocks in heap?) * Are all my ephemeral objects being created properly, or is the compiler optimizing away their allocation? How could I tell? * So far, I have been checking gc activity with --debug gc flag. Are there any more powerful tools for GC profiling/checking? Thanks, Jeremy The University of Glasgow, charity number SC004401

5 4

Poly/ML and SML/NJ warn inconsistently about using op for an infix constructor
by phil.clayton＠lineone.net 04 Apr '12

04 Apr '12

For example, given infix & datatype t = & Poly/ML (5.4) reports: Warning-(&) has infix status but was not preceded by op. So Poly/ML seems to prefer the use of 'op' in a datatype declaration. However, if 'op' is present, i.e. datatype t = op & SML/NJ (110.73) reports: stdIn:2.14-2.16 Warning: unnecessary `op' Generally, it is a good principle to avoid warnings but, in this particular respect, that isn't possible for code that is shared between Poly/ML and SML/NJ. Note that MLton (20100608) doesn't warn either way. Does the Standard provide any guidance about the use of op here? Can anything be done to align the warnings from Poly/ML and SML/NJ in this respect? Thanks, Phil

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Poly/ML April 2012