July 2002 - Hugs-Bugs

A very powful tool
by jstiles 13 Jul '02

13 Jul '02

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Mutual benefit
by Dr. Anna Okainame 12 Jul '02

12 Jul '02

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FFI testers wanted
by Alastair Reid 09 Jul '02

09 Jul '02

Over the last month or so I've been rewriting Hugs' support for the Foreign Function Interface Extension to bring it into line with the current specification (release candidate 4): http://www.cse.unsw.edu.au/~chak/haskell/ffi/ The bulk of that code I could write and test myself (with some help from Sigbjorn Finne and Johan Nordlander) but to port it to other platforms and test it on other platforms I need some help. I have put a snapshot of the CVS repository at http://www.reid-consulting-uk.ltd.uk/downloads/hugs98-ffi-06072002-src.tar.… I'm looking for volunteers on Unix-like platforms to download this file (832 kB) and try to configure, build and test Hugs according to the attached script. I'm hoping to get many reports of success and failure (with information about the platform and C compiler used). This should take about 5-10 minutes for people with a fast internet connection. I'm also hoping that a few Brave Souls will mail me minor fixes for problems turned up in the process and that a few Heroes will find the time and cunningness to port the ffi to whole new architectures (i.e., not x86 or PowerPC). Please mail reports to hugs-bugs as a convenient way of keeping others informed about your progress. -- Alastair Reid alastair(a)reid-consulting-uk.ltd.uk Reid Consulting (UK) Limited http://www.reid-consulting-uk.ltd.uk/alastair/ ps This snapshot is for testing the ffi only. Other parts of Hugs are in a state of flux and probably work but may not. Unless you routinely track Hugs' CVS commits, I'd recommend deleting this snapshot once you've tested the ffi. Here's how to test this version of Hugs on Unix-like platforms. The instructions are in 4 stages and take the form of a series of Unix shell commands so the simplest thing to do is to cut and paste the commands for each stage into a shell window and check things work ok. # first download hugs98-ffi-06072002-src.tar.gz to /tmp cd /tmp tar zxvf hugs98-ffi-06072002-src.tar.gz echo << EOF ******************************************************************* Stage 1: Checking platform and compiler - for use in any reports of success/ failure. ******************************************************************* EOF uname -a cc -v echo << EOF On my machine this generates output like this: Linux bbb 2.4.19-pre10 #4 Mon Jun 10 22:20:35 BST 2002 i686 unknown Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs gcc version 2.95.4 20011002 (Debian prerelease) EOF echo << EOF ******************************************************************* Stage 2: Configuring Hugs ******************************************************************* EOF cd hugs98/src/unix ./configure --prefix=/tmp/test echo << EOF The last 20 lines or so of output should contain something like this. ... checking if '/LD' builds loadable libraries... checking if '-shared' builds loadable libraries... -shared checking if '-bundle' builds loadable libraries... (cached) -shared checking if '-bundle -lc' builds loadable libraries... (cached) -shared checking if '-shared -nostdlib' builds loadable libraries... (cached) -shared checking if '-r' builds loadable libraries... (cached) -shared checking if '-rdynamic' builds loadable libraries... (cached) -shared checking if '-G' builds loadable libraries... (cached) -shared checking if '-Aa +z' builds loadable libraries... (cached) -shared ... This shows that configure successfully found a way to build dynamically loadable files using the -shared flag. We can check what effect this had on configuration by examining hugs98/src/config.h: EOF grep DLL ../config.h grep UNDERSCORE ../config.h echo << EOF On my machine this produces: #define MKDLL_CMD "gcc -shared" /* #undef LEADING_UNDERSCORE */ EOF echo << EOF ******************************************************************* Stage 3: Building Hugs ******************************************************************* EOF cd .. make install_ffi echo << EOF ******************************************************************* Stage 4: Testing Hugs ******************************************************************* EOF cd ../tests sh testScript ffi echo << EOF This should generate output like this: ---------------------------------------------------------------- -- Testing foreign function interface. ---------------------------------------------------------------- -- !!! Testing marshalling of all the basic types -- !!! Testing all the different forms of foreign import -- !!! Testing static, dynamic and wrapped import of trig function -- !!! Testing static, dynamic and wrapped import of trig function -- !!! Testing marshalling of strings -- !!! Testing marshalling of strings -- !!! Testing system calls -- !!! Testing system calls ---------------------------------------------------------------- EOF The most likely problems are during configuration since this code has only been very lightly tested. If it fails at this point, those with a little time on their hands and some mild hacking skills could try one of the following: 1) If you have GNU autoconf on your machine, and you know how to build shared libraries on your machine, try adding an appropriate test to hugs98/src/configure.in, rerun autoconf and rerun from 'configure' onwards. The part of configure.in to change is around like 599 and reads: dnl Try the MS Visual C flags HUGS_TRY_DYNLINK("/LD") dnl Try the gcc flags HUGS_TRY_DYNLINK("-shared") dnl Try the MacOS X flags HUGS_TRY_DYNLINK("-bundle") dnl Try the MacOS X flags HUGS_TRY_DYNLINK("-bundle -lc") dnl Try the gcc flags HUGS_TRY_DYNLINK("-shared -nostdlib") dnl Some other gcc flags HUGS_TRY_DYNLINK("-r") dnl Some other gcc flags HUGS_TRY_DYNLINK("-rdynamic") dnl Try the SunOS flags HUGS_TRY_DYNLINK("-G") dnl Try the HPUX flags HUGS_TRY_DYNLINK("-Aa +z") Each of the HUGS_TRY_DYNLINK lines tests whether passing those flags to the C compiler will successfully compile and link a file built with the dynamic loading/linking mechanism on that platform. 2) If you know how to build shared libraries on your machine, try modifying the settings of DLL_FLAGS and LEADING_UNDERSCORE in hugs98/src/config.h and rerun from 'make install_ffi' onwards. The other likely source of problems is in the implementation of foreign import wrappers which are currently only implemented for the x86 and PowerPC architectures. This may fail in three ways: 1) You have an x86 or PowerPC but Hugs fails to recognize this. Those with some mild porting skills could fix this by improving the current #ifdef tests in mkThunk (hugs98/src/builtin.c line 2266) which are: #if defined(__i386__) ... #elif defined(__ppc__) && defined(__GNUC__) ... #endif 2) You have some other architecture. The following is not for the timid. Those with assembly language and machine code skills could read - the implementation of mkThunk (hugs98/src/builtin.c lines 2206-2334) - the bottom half of hugs98/doc/ffi-notes.txt - the code used by GHC (fptools/ghc/rts/Adjustor.c) http://cvs.haskell.org/cgi-bin/cvsweb.cgi/fptools/ghc/rts/Adjustor.c?rev=1.… and extend the implementation of mkThunk in Hugs appropriately. Although the amount of code required is quite small, the amount of trickery required is quite high so it would be best to coordinate any effort. If your platform is not a 32-bit platform, there will probably be problems with the marshalling libraries (Storable in particular) as well. The configuration script contains some tests to determine the size and alignment of various types but this information is not currently used in the compiler or in the libraries.

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Re: FFI testers wanted
by Alistair Cloete 09 Jul '02

09 Jul '02

Hello, I tried the seond test release (hugs98-ffi-09072002b-src.tar.gz) on Mac OS X 10.1.5 with the April 2002 Developer Tools. I found a typo in machdep.c (a wrong parameter name) and a typo in the aclocal.m4 script (SYMBOL1 was used twice in the Mac test). Also the test for a leading underscore in aclocal.m4 does not work (the return value $? gets clobbered by 'test'). I've attached a patch for these bugs, and after applying this patch I could successfully build and test Hugs. Regards, Alistair Cloete. > uname -a Darwin lambda 5.5 Darwin Kernel Version 5.5: Thu May 30 14:51:26 PDT 2002; root: xnu/xnu-201.42.3.obj~1/RELEASE_PPC Power Macintosh powerpc > cc -v Reading specs from /usr/libexec/gcc/darwin/ppc/2.95.2/specs Apple Computer, Inc. version gcc-937.2, based on gcc version 2.95.2 19991024 (re lease) > ./configure --prefix=/tmp/test ... checking if '-bundle' builds loadable libraries... -bundle ... > grep DLL ../config.h #define MKDLL_CMD "gcc -bundle" > grep UNDERSCORE ../config.h #define LEADING_UNDERSCORE 1 > cd .. > make install_ffi OK > cd ../tests > sh testScript ffi OK ---------------------8<--------------------------------- --- src/machdep.c.orig Fri Jul 5 07:21:26 2002 +++ src/machdep.c Tue Jul 9 22:35:30 2002 @@ -1952,7 +1952,7 @@ return instance; } -static void* local getDLLSymbol(dll,symbol) /* lookup dll symbol */ +static void* local getDLLSymbol(instance,symbol) /* lookup dll symbol */ void* instance; String symbol; { void *sym; --- src/unix/aclocal.m4.orig Tue Jul 9 13:08:31 2002 +++ src/unix/aclocal.m4 Tue Jul 9 22:35:19 2002 @@ -543,7 +543,7 @@ sym = NSLookupSymbolInModule(handle, SYMBOL1); if (sym != 0) exit(SYM1_OK); - sym = NSLookupSymbolInModule(handle, SYMBOL1); + sym = NSLookupSymbolInModule(handle, SYMBOL2); if (sym != 0) exit(SYM2_OK); exit(CANTFIND); @@ -585,11 +585,12 @@ then dnl compiling and linking loader succeeded ./conftest 2>/dev/null - if test $? = 3; then + ac_result=$? + if test $ac_result = 3; then ac_cv_dll_flags=$1 ac_cv_leading_underscore=no fi - if test $? = 4; then + if test $ac_result = 4; then ac_cv_dll_flags=$1 ac_cv_leading_underscore=yes fi

2 1

FFI testers wanted
by Sven Panne 09 Jul '02

09 Jul '02

Apart from the missing SPARC parts, two files had to be changed on Solaris: > uname -a SunOS neptun 5.7 Generic_106541-18 sun4u sparc SUNW,Ultra-Enterprise > gcc -v [...] Thread model: posix gcc version 3.0.2 In configure.in, change if (test "`basename ${YACC}`x" == "byaccx"); then to if test "`basename ${YACC}`x" = "byaccx" ; then After this, configure works well. > grep DLL ../config.h #define MKDLL_CMD "gcc -r" > grep UNDERSCORE ../config.h /* #undef LEADING_UNDERSCORE */ > cd .. ; make install_ffi OK. But why are some files compiled with -O2 and others not? In testScript, change source config to . ./config > cd ../tests ; sh testScript ffi ---------------------------------------------------------------- -- Testing foreign function interface. ---------------------------------------------------------------- -- !!! Testing marshalling of all the basic types -- !!! Testing all the different forms of foreign import -- !!! Testing static, dynamic and wrapped import of trig function -- !!! Testing static, dynamic and wrapped import of trig function /home/spanne/tmp/test/bin/hugs +q +w -pHugs: ffi/Sin.hs < ffi/Sin.input expected stdout not matched by reality *** ffi/Sin.output Tue Jun 18 22:02:08 2002 --- /tmp/runtest17728.3 Tue Jul 9 10:17:01 2002 *************** *** 7,13 **** Testing sin==IO wrapped_sin (should return lots of Trues) - [True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True] - - Testing sin==Id wrapped_sin (should return lots of Trues) - [True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True,True] Hugs:[Leaving Hugs] --- 7,10 ---- Testing sin==IO wrapped_sin (should return lots of Trues) + ERROR - Foreign export dynamic is not supported on this architecture Hugs:[Leaving Hugs] -- !!! Testing marshalling of strings -- !!! Testing marshalling of strings -- !!! Testing system calls -- !!! Testing system calls /home/spanne/tmp/test/bin/hugs +q +w -pHugs: ffi/FileIO.hs < ffi/FileIO.input expected stdout not matched by reality *** ffi/FileIO.output Sat Jun 22 01:22:01 2002 --- /tmp/runtest17813.3 Tue Jul 9 10:17:10 2002 *************** *** 16,17 **** --- 16,20 ---- + IO Error: User error + Reason: open2: (-1,2) + Hugs:[Leaving Hugs] ---------------------------------------------------------------- Cheers, S.

2 5

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09 Jul '02

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1 0

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08 Jul '02

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1 0

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1 0

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1 0