Poly/ML

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711 discussions

Problem linking .o file
by rda＠lemma-one.com 25 Nov '21

25 Nov '21

I am trying to reproduce an issue reported by a ProofPower user. I am not getting as far as he did. I am seeing the following, when I try to produce an executable from a .o file created using PolyML.export. rda]- polyc -o main1 main1.o Undefined symbols for architecture x86_64: "_PolyFFIGeneral", referenced from: anon in main1.o "_PolyNetworkGeneral", referenced from: anon in main1.o "_PolyNetworkGetHostByAddr", referenced from: anon in main1.o "_PolyNetworkGetHostByName", referenced from: anon in main1.o "_PolyTimingGeneral", referenced from: anon in main1.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) This is with Poly/ML 5.8.2 running on MacOS Catalina 10.15.7. polyc successfully builds an executable when I create a toy example, but not for this .o file which contains most of a fairly large application. Where am I going wrong? Regards, Rob.

2 1

Detect Current Running OS in Poly/ML
by technical+polymlmailinglist＠zacque.tk 13 Nov '21

13 Nov '21

Hi, How to detect the current running OS in Poly/ML? I'm looking for something like: datatype Platform = Linux | Windows | macOS | BSD | ... val getPlatform : unit -> Platform If not, how can I implement something like this, if possible? I'm asking because it's useful for writing OS specific library, e.g. path library to print Unix/Windows-style path. I've tried searching around the web and looking into the Basis Library manual, but still couldn't find anything useful. Any pointer will be much appreciated. Thanks! -- Cheers, zacque

2 2

Updates to master for 5.9 release
by David.Matthews＠prolingua.co.uk 13 Nov '21

13 Nov '21

There have been a number of updates to master since the initial announcement. Thank you for all the feedback. Most of the issues have been about the ARM64 code-generator. Some could be fixed easily but one has required more work. The symptom was an InternalError exception that indicated that the code was too large for the offset in an instruction. This has now been fixed by using a pair of instructions in that case but it has required changes to the run-time system to handle the different relocations that are needed. That had to be done for each of the major operating systems since Linux/BSD, Windows and Mac OS each have their own object code format. It's possible, though unlikely, that these changes have broken something on platforms other than ARM so I will hold off the final release for a week or in case there are any problems. David

1 0

Build failure under cygwin
by moss＠cs.umass.edu 10 Nov '21

10 Nov '21

I was about to do an upgrade of HOL4 and decided to do a polyml upgrade first. My setup used to build fine under Cygwin, but now fails. The proximal failure is this: ./polyimport ./bootstrap/bootstrap64.txt -I . < ./bootstrap/Stage1.sml Unable to allocate memory I'm not sure where to go next in diagnosing this ... Here's the config.status if that helps in giving me hints :-) ... Regards - Eliot Moss #! /bin/sh # Generated by configure. # Run this file to recreate the current configuration. # Compiler output produced by configure, useful for debugging # configure, is in config.log if it exists. debug=false ac_cs_recheck=false ac_cs_silent=false SHELL=${CONFIG_SHELL-/bin/sh} export SHELL ## -------------------- ## ## M4sh Initialization. ## ## -------------------- ## # Be more Bourne compatible DUALCASE=1; export DUALCASE # for MKS sh if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then : emulate sh NULLCMD=: # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which # is contrary to our usage. Disable this feature. alias -g '${1+"$@"}'='"$@"' setopt NO_GLOB_SUBST else case `(set -o) 2>/dev/null` in #( *posix*) : set -o posix ;; #( *) : ;; esac fi as_nl=' ' export as_nl # Printing a long string crashes Solaris 7 /usr/bin/printf. as_echo='\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\' as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo$as_echo # Prefer a ksh shell builtin over an external printf program on Solaris, # but without wasting forks for bash or zsh. if test -z "$BASH_VERSION$ZSH_VERSION" \ && (test "X`print -r -- $as_echo`" = "X$as_echo") 2>/dev/null; then as_echo='print -r --' as_echo_n='print -rn --' elif (test "X`printf %s $as_echo`" = "X$as_echo") 2>/dev/null; then as_echo='printf %s\n' as_echo_n='printf %s' else if test "X`(/usr/ucb/echo -n -n $as_echo) 2>/dev/null`" = "X-n $as_echo"; then as_echo_body='eval /usr/ucb/echo -n "$1$as_nl"' as_echo_n='/usr/ucb/echo -n' else as_echo_body='eval expr "X$1" : "X\$.*\$"' as_echo_n_body='eval arg=$1; case $arg in #( *"$as_nl"*) expr "X$arg" : "X\$.*\$$as_nl"; arg=`expr "X$arg" : ".*$as_nl\$.*\$"`;; esac; expr "X$arg" : "X\$.*\$" | tr -d "$as_nl" ' export as_echo_n_body as_echo_n='sh -c $as_echo_n_body as_echo' fi export as_echo_body as_echo='sh -c $as_echo_body as_echo' fi # The user is always right. if test "${PATH_SEPARATOR+set}" != set; then PATH_SEPARATOR=: (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 || PATH_SEPARATOR=';' } fi # IFS # We need space, tab and new line, in precisely that order. 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|| _lt_function_replace_fail=: sed -e '/^func_arith ()$/,/^} # func_arith /c\ func_arith ()\ {\ func_arith_result=$(( $* ))\ } # Extended-shell func_arith implementation' "$cfgfile" > $cfgfile.tmp \ && mv -f "$cfgfile.tmp" "$cfgfile" \ || (rm -f "$cfgfile" && cp "$cfgfile.tmp" "$cfgfile" && rm -f "$cfgfile.tmp") test 0 -eq $? || _lt_function_replace_fail=: sed -e '/^func_len ()$/,/^} # func_len /c\ func_len ()\ {\ func_len_result=${#1}\ } # Extended-shell func_len implementation' "$cfgfile" > $cfgfile.tmp \ && mv -f "$cfgfile.tmp" "$cfgfile" \ || (rm -f "$cfgfile" && cp "$cfgfile.tmp" "$cfgfile" && rm -f "$cfgfile.tmp") test 0 -eq $? || _lt_function_replace_fail=: fi if test x"$lt_shell_append" = xyes; then sed -e '/^func_append ()$/,/^} # func_append /c\ func_append ()\ {\ eval "${1}+=\\${2}"\ } # Extended-shell func_append implementation' "$cfgfile" > $cfgfile.tmp \ && mv -f "$cfgfile.tmp" "$cfgfile" \ || (rm -f "$cfgfile" && cp "$cfgfile.tmp" "$cfgfile" && rm -f "$cfgfile.tmp") test 0 -eq $? 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|| _lt_function_replace_fail=: fi if test x"$_lt_function_replace_fail" = x":"; then { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Unable to substitute extended shell functions in $ofile" >&5 $as_echo "$as_me: WARNING: Unable to substitute extended shell functions in $ofile" >&2;} fi mv -f "$cfgfile" "$ofile" || (rm -f "$ofile" && cp "$cfgfile" "$ofile" && rm -f "$cfgfile") chmod +x "$ofile" cat <<_LT_EOF >> "$ofile" # ### BEGIN LIBTOOL TAG CONFIG: CXX # The linker used to build libraries. LD=$lt_LD_CXX # How to create reloadable object files. reload_flag=$lt_reload_flag_CXX reload_cmds=$lt_reload_cmds_CXX # Commands used to build an old-style archive. old_archive_cmds=$lt_old_archive_cmds_CXX # A language specific compiler. CC=$lt_compiler_CXX # Is the compiler the GNU compiler? with_gcc=$GCC_CXX # Compiler flag to turn off builtin functions. no_builtin_flag=$lt_lt_prog_compiler_no_builtin_flag_CXX # Additional compiler flags for building library objects. pic_flag=$lt_lt_prog_compiler_pic_CXX # How to pass a linker flag through the compiler. wl=$lt_lt_prog_compiler_wl_CXX # Compiler flag to prevent dynamic linking. link_static_flag=$lt_lt_prog_compiler_static_CXX # Does compiler simultaneously support -c and -o options? compiler_c_o=$lt_lt_cv_prog_compiler_c_o_CXX # Whether or not to add -lc for building shared libraries. build_libtool_need_lc=$archive_cmds_need_lc_CXX # Whether or not to disallow shared libs when runtime libs are static. allow_libtool_libs_with_static_runtimes=$enable_shared_with_static_runtimes_CXX # Compiler flag to allow reflexive dlopens. export_dynamic_flag_spec=$lt_export_dynamic_flag_spec_CXX # Compiler flag to generate shared objects directly from archives. whole_archive_flag_spec=$lt_whole_archive_flag_spec_CXX # Whether the compiler copes with passing no objects directly. compiler_needs_object=$lt_compiler_needs_object_CXX # Create an old-style archive from a shared archive. old_archive_from_new_cmds=$lt_old_archive_from_new_cmds_CXX # Create a temporary old-style archive to link instead of a shared archive. old_archive_from_expsyms_cmds=$lt_old_archive_from_expsyms_cmds_CXX # Commands used to build a shared archive. archive_cmds=$lt_archive_cmds_CXX archive_expsym_cmds=$lt_archive_expsym_cmds_CXX # Commands used to build a loadable module if different from building # a shared archive. module_cmds=$lt_module_cmds_CXX module_expsym_cmds=$lt_module_expsym_cmds_CXX # Whether we are building with GNU ld or not. with_gnu_ld=$lt_with_gnu_ld_CXX # Flag that allows shared libraries with undefined symbols to be built. allow_undefined_flag=$lt_allow_undefined_flag_CXX # Flag that enforces no undefined symbols. no_undefined_flag=$lt_no_undefined_flag_CXX # Flag to hardcode \$libdir into a binary during linking. # This must work even if \$libdir does not exist hardcode_libdir_flag_spec=$lt_hardcode_libdir_flag_spec_CXX # Whether we need a single "-rpath" flag with a separated argument. hardcode_libdir_separator=$lt_hardcode_libdir_separator_CXX # Set to "yes" if using DIR/libNAME\${shared_ext} during linking hardcodes # DIR into the resulting binary. hardcode_direct=$hardcode_direct_CXX # Set to "yes" if using DIR/libNAME\${shared_ext} during linking hardcodes # DIR into the resulting binary and the resulting library dependency is # "absolute",i.e impossible to change by setting \${shlibpath_var} if the # library is relocated. hardcode_direct_absolute=$hardcode_direct_absolute_CXX # Set to "yes" if using the -LDIR flag during linking hardcodes DIR # into the resulting binary. hardcode_minus_L=$hardcode_minus_L_CXX # Set to "yes" if using SHLIBPATH_VAR=DIR during linking hardcodes DIR # into the resulting binary. hardcode_shlibpath_var=$hardcode_shlibpath_var_CXX # Set to "yes" if building a shared library automatically hardcodes DIR # into the library and all subsequent libraries and executables linked # against it. hardcode_automatic=$hardcode_automatic_CXX # Set to yes if linker adds runtime paths of dependent libraries # to runtime path list. inherit_rpath=$inherit_rpath_CXX # Whether libtool must link a program against all its dependency libraries. link_all_deplibs=$link_all_deplibs_CXX # Set to "yes" if exported symbols are required. always_export_symbols=$always_export_symbols_CXX # The commands to list exported symbols. export_symbols_cmds=$lt_export_symbols_cmds_CXX # Symbols that should not be listed in the preloaded symbols. exclude_expsyms=$lt_exclude_expsyms_CXX # Symbols that must always be exported. include_expsyms=$lt_include_expsyms_CXX # Commands necessary for linking programs (against libraries) with templates. prelink_cmds=$lt_prelink_cmds_CXX # Commands necessary for finishing linking programs. postlink_cmds=$lt_postlink_cmds_CXX # Specify filename containing input files. file_list_spec=$lt_file_list_spec_CXX # How to hardcode a shared library path into an executable. hardcode_action=$hardcode_action_CXX # The directories searched by this compiler when creating a shared library. compiler_lib_search_dirs=$lt_compiler_lib_search_dirs_CXX # Dependencies to place before and after the objects being linked to # create a shared library. predep_objects=$lt_predep_objects_CXX postdep_objects=$lt_postdep_objects_CXX predeps=$lt_predeps_CXX postdeps=$lt_postdeps_CXX # The library search path used internally by the compiler when linking # a shared library. compiler_lib_search_path=$lt_compiler_lib_search_path_CXX # ### END LIBTOOL TAG CONFIG: CXX _LT_EOF ;; "basis":C) test -e basis || ln -sf ${ac_top_srcdir}/basis . ;; "mlsource":C) test -e mlsource || ln -sf ${ac_top_srcdir}/mlsource . ;; "polyc":F) chmod +x polyc ;; esac done # for ac_tag as_fn_exit 0

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Towards the next release (5.9)
by David.Matthews＠prolingua.co.uk 02 Nov '21

02 Nov '21

Hello Oskar, I'm copying this to the mailing list since I think it may be of wider interest. Thank you for investigating the problem. I've looked into this and found that there is problem with mprotect sometimes failing and this seems to be a bug in Mac OS. I've pushed a fix but I wasn't able to test your specific example so maybe you can try it and let me know if the fix has worked. Mac OS has introduced a restriction that prevents a thread from simultaneously having write and execute access to a page. This seems to affect ARM code but it doesn't look as though it's enabled with X86 code under Rosetta. Inevitably, being Apple, they have taken a different approach from SELinux and OpenBSD so I've had to add special code when allocating areas of memory for code in Mac OS on ARM. It looks as though mprotect on Mac OS can return an error if it is called a second time with the same arguments. That looks like a kernel bug to me. The problem is still there in the latest kernel, 20.3.0. I've worked around it by ignoring any error from mprotect since in this particular case the previous protection state is fine. David On 31/10/2021 13:45, Oskar Abrahamsson wrote: > Hello David, > > Here is a bug that manifests itself with a Poly/ML compiler built on/for > macOS-arm64, but not when the same compiler is built using Rosetta on > the same machine. Here is the output from 'poly -v' for these compilers: > > ? Poly/ML 5.9 Release ? ?RTS version: Arm64-5.9 (Git version > v5.8.2-324-g960de0cd) > ? Poly/ML 5.9 Release ? ?RTS version: X86_64-5.9 (Git version > v5.8.2-324-g960de0cd) > > Both compilers are built in the same way (./configure, then make, then > make compiler) but with all calls prefixed with ?arch -x86_64? for the > Rosetta compiler. > > Here is the bug: polyc dies when attempting to build src/poly-mlyacc.ML > from this code: > https://github.com/HOL-Theorem-Prover/HOL/tree/develop/tools/mlyacc > <https://github.com/HOL-Theorem-Prover/HOL/tree/develop/tools/mlyacc>. > To reproduce, go to src/ and run 'polyc poly-mlyacc.ML'. ?Here is the > failure: > > > ? ? Exception- Fail "Insufficient Memory" raised > > I managed to find a failing call to mprotect which leads to the message > above being shown during export, by looking at output generated from > polyc when called with the --debug saving and --debug memmgr flags. Here > are the last few lines of that output: > > ? ? SAVE: Allocated graveyard for permanent space, 0x138008000 size: > 4340064. > ? ? SAVE: Allocated graveyard for permanent space, 0x138430000 size: > 7542328. > ? ? SAVE: Allocated graveyard for permanent space, 0x138b68000 size: > 510648. > ? ? SAVE: Allocated graveyard for permanent space, 0x138be8000 size: > 344120. > ? ? SAVE: Copyscan default sizes: Immutable: 1048576, Mutable: 1048576, > Code: 1048576, No-overwrite 4096. > ? ? MMGR: New export immutable space 0x600001004000, size=1024k words, > bottom=0x106aec000, top=0x1072ec000 > ? ? MMGR: New export immutable space: insufficient space > ? ? SAVE: Unable to allocate export space, size: 1048576. > ? ? Exception- Fail "Insufficient Memory" raised > ? ? MMGR: Deleted stack space 0x600001800dc0 at 0x1092ec000 size 262144 > ? ? MMGR: Deleted stack space 0x600001804000 at 0x10559c000 size 2048 > > The ?MMGR: New export immutable space: insufficient space? message seems > to appear because space->bottom == 0 at line 441 in > libpolyml/memmgr.cpp,?and the reason why space->bottom == 0 is because > the call to mprotect at line 330 in libpolyml/osmemunix.cpp fails with > ENOACCES. > > If there is any other information that I can provide that would be more > helpful, please let me know. > > ? Oskar > > > >> On 30 Oct 2021, at 09:50, David Matthews >> <David.Matthews at prolingua.co.uk >> <mailto:David.Matthews at prolingua.co.uk>> wrote: >> >> I'm intending to release the current master on github as version 5.9 >> in the near future. ?Could I ask everyone to give it a try and let me >> know if there are any serious bugs that need to be fixed. ?The main >> differences are the ARM64 code-generator, the new bootstrap process >> and position-independent code. This was described in greater detail >> back in May >> http://lists.inf.ed.ac.uk/pipermail/polyml/2021-May/002451.html >> <http://lists.inf.ed.ac.uk/pipermail/polyml/2021-May/002451.html> . >> There have also been other smaller changes and fixes. >> >> David >> _______________________________________________ >> polyml mailing list >> polyml at inf.ed.ac.uk <mailto:polyml at inf.ed.ac.uk> >> http://lists.inf.ed.ac.uk/mailman/listinfo/polyml >

2 4

Towards the next release (5.9)
by David.Matthews＠prolingua.co.uk 30 Oct '21

30 Oct '21

I'm intending to release the current master on github as version 5.9 in the near future. Could I ask everyone to give it a try and let me know if there are any serious bugs that need to be fixed. The main differences are the ARM64 code-generator, the new bootstrap process and position-independent code. This was described in greater detail back in May http://lists.inf.ed.ac.uk/pipermail/polyml/2021-May/002451.html . There have also been other smaller changes and fixes. David

1 0

Metaprogramming
by antonlobach＠uri.edu 10 Oct '21

10 Oct '21

Hello, Does PolyML support any form of metaprogramming? Best, Anton

2 1

Can't build Poly/ML after introducing RunCall.rtsCallFast1
by phil.clayton＠veonix.com 01 Oct '21

01 Oct '21

I'm adding conversions for other C types, based on the latest master (cf6f86a), but building fails without any error message. polyimport fails on my version of ForeignConstants.sml.? After experimenting, it seems that introducing ? RunCall.rtsCallFast1"f" () where f is a new function that I am also introducing, causes the failure. Is there a different way I should be building?? I'm sure I just ran 'make', 'make compiler' when I did this before.? I have attached the patch in case I've done something silly in there.

1 1

Unix.execute argument list backwards incompatibility
by Ramana.Kumar＠cl.cam.ac.uk 21 Jun '21

21 Jun '21

I think the C code replacing the ML code for Unix.execute does not quite do what the ML code used to. Specifically the execve call here https://github.com/polyml/polyml/blob/master/libpolyml/unix_specific.cpp#L2… does not pass the cmd as the first argument, whereas the ML version did. This is a user-visible change in the API that was probably unintended.

2 3

Git master update: ARM64, PIE and new bootstrap process
by David.Matthews＠prolingua.co.uk 15 May '21

15 May '21

Now that 5.8.2 has been released I've updated Git master with some changes that have been in the pipeline for some time. These affect a number of issues so they probably need a bit of explanation. These are: a basic code-generator for 64-bit ARM, position-independent executables and a new bootstrap process. This is quite a long message since each of these require some explanation. Bootstrap The updated bootstrap process affects all architectures. Because Poly/ML is written in ML there needs to be an ML compiler to compile the source. The solution up to now has been to have pre-built compilers for each architecture. The bootstrap process then compiles the basis library and builds the final binary from that. The problem is that this requires a compiler for each architectures; for 5.8.2 that is seven in all: X86/32, 32-bit interpreted, 64-bit interpreted, X86/64 and X86/64/32, with different version for the last two for Windows and Unix because of the different ABIs. Adding ARM64 would have increased this further. The solution was to bootstrap from the interpreted version. This requires only two pre-built compilers, for 32- and 64-bits. However building a final native code compiler requires the whole system to be compiled several times. This doesn't take long on reasonable hardware but can be slow on under-powered machines or with debugging turned on. The final binary is as fast as before; it's just the bootstrap that is slow. A consequence of this is that it is no longer necessary to run "make compiler" when building from Git. Previously the compiler itself was not rebuilt with a simple "make" so changes that involved the compiler itself needed "make compiler" in order to be incorporated. That is no longer the case since the bootstrap process recompiles the compiler. "make compiler" has been retained for compatibility but it may actually be better not to use it, particularly if --enable-intinf-as-int has been included. --enable-intinf-as-int builds the basis library and any subsequent code with int as arbitrary precision. Running "make compiler" would build the compiler itself with arbitrary precision rather than fixed precision which will be bulkier even if it doesn't noticeably affect the speed. Position-independent code The new version now generates position-independent executables on X86/64 and ARM64. This has been in the pipe-line for a while but was spurred on by the fact that Mac OS requires it for ARM code. What this means is that the code segments in object files created by PolyML.export no longer contain absolute addresses. The "constant area" associated with the code for each function is pulled out and placed in a read-only, non-executable area. It's too complicated to do this X86/32 so 32-bit programs will continue to need special treatment on platforms that have problems with non-PIC but for the majority of code on 64-bits there should no longer be problems in this area. It doesn't apply to Windows, which doesn't need this, or to compact 32-bit or interpreted code where the "code" is not marked as executable. ARM64 Last but not least there is now a basic code-generator for the ARM64. This has been tested on a wide range of hardware and systems including Windows 10, Debian under Windows-subsystem-for-Linux, Mac OS X, PiOS on various 64-bit Raspberry Pis and even big-endian NetBSD on a Raspberry Pi. It is complete including compiled FFI and compact 32-bit. However, at this stage the code-generator has no optimisation or proper register allocation and treats the machine as essentially single-register plus stack. That greatly simplifies the code-generation at the expense of bulky and slow code. On a Mac Mini X86/64 code translated by Rosetta is still roughly 1.5 to 2 times faster. Rosetta code is reported to be about 80% of the speed of optimised ARM code so things should improve with optimisation. There is one point about the ARM code-generator that is worth making. The ARM has a weaker memory model than the X86 and that can affect multi-threaded code with shared references. Code that uses mutexes to protect all accesses to shared references is not affected since the mutex access includes the appropriate memory barriers but during testing I came across a problem with futures in Isabelle. Since once a future is evaluated it can never change it is generally possible to access it without a lock and only use a lock if it appears to be unevaluated. Unlike the X86 the ARM does not guarantee that another thread will see updates to different addresses in the same order as they are made by the thread making the assignments. In this particular case a thread was creating a value on the heap and then assigning the address of this heap cell to a shared reference. On the X86 the update to the heap would always be seen before the update to the shared reference but on the ARM it was possible for another thread to cache that part of the heap and so read values in the heap that were completely random. Since the consequence of this is completely unpredictable behaviour I took the decision to implement '!' and ':=' using instructions that incorporate memory barriers giving read-acquire/store-release semantics. Currently this does not apply to other mutable structures such as arrays but for consistency it probably should. There doesn't seem to be any measurable difference in speed by using these instructions compared with the ones without the memory barriers although the code is slightly longer. David

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