Import hs-plugins cvs

This commit is contained in:
Don Stewart 2005-04-24 08:51:33 +00:00
commit 887fa59389
494 changed files with 23721 additions and 0 deletions

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Don Stewart <http://www.cse.unsw.edu.au/~dons>
Sean Seefried <http://www.cse.unsw.edu.au/~sseefried>
Andre Pang <http://www.algorithm.com.au>

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CVS BUILDING INSTRUCTIONS
=========================
These are build instructions if you've checked out hs-plugins
from CVS (instead of downloading a source distribution tarball).
1. Execute autogen.sh to generate the GNU ./configure script:
./autogen.sh
2. Build hs-plugins as usual with ./configure && make
cvsps
=====
For people who are used to more modern revision control systems
(such as Darcs, Subversion and Arch) and miss working with
'patchsets' instead of the disjoint per-file patches that CVS
uses, take a look at cvsps <http://www.cobite.com/cvsps/>,
a patchset manager for CVS. While it doesn't, by any means, give
you the many advantages that more modern source control systems
offer you, it certainly makes using CVS and managing patches far
easier!

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That's all there is to it!

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# Copyright (c) 2004 Don Stewart - http://www.cse.unsw.edu.au/~dons
# LGPL version 2.1 or later (see http://www.gnu.org/copyleft/lesser.html)
# cut down reimplementation of $fptools/mk directory
.PHONY: build all
all: headers runplugs plugs
build:
cd src && $(MAKE)
plugs: build
( cd examples/hmake/lib-plugs ; $(MAKE) build )
cp examples/hmake/lib-plugs/plugs ./
runplugs: build
( cd examples/hmake/one-shot ; $(MAKE) build )
cp examples/hmake/one-shot/runplugs ./
headers: build
cp src/eval/Eval/Haskell_stub.h EvalHaskell.h
#
# installing
#
# TODO put these in subdirs
install:
$(INSTALL_DATA_DIR) $(LIBDIR)/include
$(INSTALL_DATA) EvalHaskell.h $(LIBDIR)/include
@(cd src && $(MAKE) install)
$(INSTALL_DATA_DIR) $(PREFIX)/bin
$(INSTALL_PROGRAM) plugs $(PREFIX)/bin/
$(INSTALL_PROGRAM) runplugs $(PREFIX)/bin/
#
# and register the library with ghc package system
# Use this target if installing by hand. May need to be performed as root
#
register:
env LIBDIR=${LIBDIR} $(GHC_PKG) -u < src/altdata/altdata.conf.in
env LIBDIR=${LIBDIR} $(GHC_PKG) -u < src/hi/hi.conf.in
env LIBDIR=${LIBDIR} $(GHC_PKG) -u < src/plugins/plugins.conf.in
env LIBDIR=${LIBDIR} $(GHC_PKG) -u < src/eval/eval.conf.in
env LIBDIR=${LIBDIR} $(GHC_PKG) -u < src/printf/printf.conf.in
# and unregister the packages
unregister:
$(GHC_PKG) -r printf
$(GHC_PKG) -r eval
$(GHC_PKG) -r plugins
$(GHC_PKG) -r hi
$(GHC_PKG) -r altdata
#
# regress check. TODO check expected output
#
check:
@if [ ! -f EvalHaskell.h ] ; then \
echo "run 'make' first" ; \
exit 1 ;\
fi
@( d=/tmp/plugins.tmp.$$$$ ; mkdir $$d ; export TMPDIR=$$d ;\
for i in `find examples ! -name CVS -type d -maxdepth 2 -mindepth 2` ; do \
printf "=== testing %-50s ... " "$$i" ; \
( cd $$i ; if [ -f dont_test ] ; then \
echo "ignored." ;\
else ${MAKE} -sk && ${MAKE} -ksi check |\
sed '/^Compil/d;/^Load/d;/Read/d;/Expan/d;/Savi/d;/Writ/d' ;\
${MAKE} -sk clean ;\
fi ) 2> /dev/null ;\
done ; rm -rf $$d )
#
# making clean
#
CLEAN_FILES += *.conf.*.old *~
EXTRA_CLEANS+=*.conf.inplace* *.conf.in *.h autom4te.cache \
config.h config.mk config.log config.status configure
clean:
cd docs && $(MAKE) clean
cd src && $(MAKE) clean
rm -rf $(CLEAN_FILES)
find examples -name '*.a' -exec rm {} \;
find examples -name '*~' -exec rm {} \;
find examples -name 'a.out' -exec rm {} \;
find examples -name '*.hi' -exec rm {} \;
find examples -name '*.o' -exec rm {} \;
find examples -name '*.core' -exec rm {} \;
find examples -name 'package.conf' -exec rm {} \;
rm -rf plugs
rm -rf runplugs
rm -rf examples/hmake/lib-plugs/plugs
rm -rf examples/hmake/one-shot/runplugs
rm -f EvalHaskell.h
distclean: clean
rm -rf $(EXTRA_CLEANS)
include config.mk

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------------------------------------------------------------------------
hs-plugins
------------------------------------------------------------------------
Compiler and tool support for compiling and loading, and evaluating
Haskell at runtime.
The library provides a convenient interface to GHC's runtime loader
and linker, letting you load compiled Haskell code.
It also provides a `make' system for compiling plugin source
automagically and for combining the user's .hs file with a stub of
standard declarations and syntax, saving the user from having to write
standard code themselves.
It provides an eval() function, for generating new, well-typed,
compiled code from a Haskell source string.
It also provides a new variation of printf for Haskell-- a runtime
generated, dynamically-typed printf.
Read the documentation in doc/ for more.
------------------------------------------------------------------------
DEPENDENCIES:
* Requires GNU make or BSD make to build
* Requires GHC > 6.2 (for Typeable.h)
* 'plugs' requires a working readline library.
* If you wish to use TH in plugins, or to run load()-programs in GHCi,
you require a patch to GHC's linker, that was committed into ghc
6.3, and ghc 6.2 -stable branch, and is available from 6.2.2 onwards.
* If you need to regenerate ./configure you need >= autoconf-2.53
------------------------------------------------------------------------
BUILDING:
$ ./configure --prefix=/usr/local
$ make
$ make install
If you wish to register the libraries as official ghc pkg (probably as
root):
$ make register
And to unregister (maybe as root). Note that the unistall order
matters:
$ ghc-pkg -r printf
$ ghc-pkg -r eval
$ ghc-pkg -r plugins
$ ghc-pkg -r hi
$ ghc-pkg -r altdata
Once it is registered, you can link against the library by just adding
-package plugins or, e.g. -package eval, to your command line.
The documentation relies on latex, dvips, tex2page:
$ cd doc && make
EXAMPLES:
Have a look in the examples/ directory for many examples of how to
arrange your code.
LICENSE:
This library is distributed under the terms of the LGPL. The runtime
loader code is based on code written by André Pang, and others, and is
distributed under the BSD-style Glasgow University license.
PORTABILITY:
Requires GHC 6.2 or greater, though most testing has be done on 6.3.
They dynamic loader requires a functional GHCi implementation.
---------------------+--------------------------------------------------
Platform | Works Should work* Unknown Won't work
---------------------+--------------------------------------------------
i386-*-linux | X
i386-*-freebsd | X
i386-*-openbsd | X
powerpc-apple-darwin | X
sparc-*-solaris2 | X
ia64-*-linux | #
i386-*-solaris2 | X
sparc-*-linux | X
sparc-*-openbsd | X
i386-*-netbsd | X
amd64-*-openbsd | X
mips64-sgi-irix | X
---------------------+--------------------------------------------------
# .hi file parsing is currently broken

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For 0.1
----------
+ have eval, printf return errors as arguments, not to stdout
+ nice functions for cleaning up /tmp files, given a module name
+ PORTABILITY -- pretty much all of this is in main/SysTools.lhs in GHC
-- where to /tmp files go? Use SysTools code from GHC
-- need to dosify file names on in and out
-- try to confirm the implementation of forkProcess
+ write a script to strip down the release code.
+ .hi file parser is broken on Itanium, again.
+ Implement hs_eval by marshalling Dynamics across to the C side for
checking.
+ Make data structures used by the library Storable, for C programs
+ insert iface info into the state, building up a dependency graph like
hram's. use this to allow cascading unloading. Does anyone want this?
+ enable more .hi interface code to provide full GHC-like :t options
to plugs.
+ replace the String interface to eval with an ExpQ interface.
+ build way=p and way=''

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hs-plugins 0.9.8

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#!/bin/sh -x
# this is the world's most complicated autogen.sh script :)
exec autoconf

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/*
* Copyright (c) 2004 Don Stewart - http://www.cse.unsw.edu.au/~dons
* LGPL version 2.1 or later (see http://www.gnu.org/copyleft/lesser.html)
*/
/* symbols that must be assigned to variables in Haskell code */
/* NOTE: this is not the same as symbols needed for cpp of .hs code */
/* path to ghc */
#define GHC "@GHC@"
/* path to GHC libraries */
#define GHC_LIB_PATH "@GHC_LIB_PATH@"
#define TOP "@TOP@"
#define LEADING_UNDERSCORE @LEADING_UNDERSCORE@
#define CABAL @CABAL@

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#
# Copyright (c) 2004 Don Stewart - http://www.cse.unsw.edu.au/~dons
# LGPL version 2.1 or later (see http://www.gnu.org/copyleft/lesser.html)
#
#
# config.mk.in :
# variables that need to be visible in Makefiles
#
# all is the default rule for everyone
default: all
PACKAGE = plugins
UPACKAGE = Plugins
TOP = @TOP@
PREFIX = @PREFIX@
LIBDIR = $(PREFIX)/lib/hs-$(PACKAGE)
BINDIR = $(PREFIX)/bin
WHOLE_ARCHIVE_FLAG = @WHOLE_ARCHIVE_FLAG@
# Are we using the new Cabal packages?
CABAL = @CABAL@
GHC = @GHC@
GHC_LIB_PATH = @GHC_LIB_PATH@
GHC_VERSION = @GHC_VERSION@
GLASGOW_HASKELL = @GLASGOW_HASKELL@
GHC_EXTRA_OPTS = @SYMS@ @DEBUG_OPTS@
GHC_LD_OPTS =
GHC_PKG = @GHCPKG@-@GHC_VERSION@
LD = @LD@
LD_X = -x
HAPPY = @HAPPY@
HAPPY_OPTS = -a -g -c
ALEX = @ALEX@
ALEX_OPTS = --ghc
HADDOCK = @HADDOCK@
AR = @AR@
RANLIB = @RANLIB@
RM = @RM@
INSTALL = @INSTALL@
# A few aliases
INSTALL_PROGRAM = ${INSTALL} -s -m 755
INSTALL_DATA = ${INSTALL} -m 644
INSTALL_DATA_DIR= ${INSTALL} -d -m 755

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#
# Copyright (c) 2004 Don Stewart - http://www.cse.unsw.edu.au/~dons
# LGPL version 2.1 or later (see http://www.gnu.org/copyleft/lesser.html)
#
# sanity test
AC_INIT(src/plugins/Plugins.hs)
# untested on earlier than 2.52, but it won't work anyway
AC_PREREQ(2.53)
# Find out what type of system we're running on
AC_CANONICAL_BUILD
PREFIX="$prefix"
if test "$prefix" = "NONE"
then
PREFIX="$ac_default_prefix"
fi
AC_SUBST(PREFIX)
Platform="$build_cpu-$build_vendor-$build_os"
case $Platform in
powerpc-apple-darwin*)
MACOSX=yes
;;
*)
MACOSX=no
;;
esac
if test "$MACOSX" = "yes"
then
WHOLE_ARCHIVE_FLAG=-all_load
LEADING_UNDERSCORE=1
else
WHOLE_ARCHIVE_FLAG=--whole-archive
LEADING_UNDERSCORE=0
fi
AC_SUBST(WHOLE_ARCHIVE_FLAG)
AC_SUBST(LEADING_UNDERSCORE)
TOP=`pwd`
AC_SUBST(TOP)
# necessary tools
# allow user supplied haskell compiler
AC_ARG_WITH(ghc,
AC_HELP_STRING([--with-ghc=<ghc>],[use a specific Haskell compiler]),
[ GHC="$withval"
if test ! -f "$GHC" ; then
AC_MSG_ERROR([$GHC not found. You need GHC to build this project])
fi
],
[ AC_CHECK_PROG(GHC,ghc,ghc)
if test -z "$GHC" ; then
AC_MSG_ERROR([You need GHC to build this project])
fi
]
)
AC_SUBST(GHC)
# find path to GHC libs, for runtime_loader
if test -n "$GHC" ; then
AC_MSG_CHECKING([for ghc library directory])
GHC_LIB_PATH=`$GHC --print-libdir`
AC_MSG_RESULT([$GHC_LIB_PATH])
fi
AC_SUBST(GHC_LIB_PATH)
# check ghc version here
if test -n "$GHC" ; then
AC_MSG_CHECKING([for ghc version])
GHC_VERSION=`$GHC --numeric-version`
AC_MSG_RESULT([$GHC_VERSION])
fi
AC_SUBST(GHC_VERSION)
# Work out value of __GLASGOW_HASKELL__
if test -n "$GHC" ; then
AC_MSG_CHECKING([for value of __GLASGOW_HASKELL__])
echo "main = print __GLASGOW_HASKELL__" > t.hs
GLASGOW_HASKELL=`echo 'main' | "$GHC" --interactive -v0 -cpp t.hs`
rm t.hs
AC_MSG_RESULT([$GLASGOW_HASKELL])
fi
AC_SUBST(GLASGOW_HASKELL)
dnl ** quote char breaks sed
changequote(, )dnl
MAJOR=`echo "$GHC_VERSION" | sed 's/^\([^\.]*\)\.\([^\.]*\).*/\1/'`
MINOR=`echo "$GHC_VERSION" | sed 's/^\([^\.]*\)\.\([^\.]*\).*/\2/'`
changequote([, ])dnl
if test "$MAJOR" -lt "6"; then
AC_MSG_ERROR(Found major $MAJOR. You need a ghc version >= 6.2) ;
fi
if test "$MINOR" -lt "2"; then
AC_MSG_ERROR(You need a ghc version >= 6.2) ;
fi
#Allow plugins to be built with Cabal libraries
AC_ARG_ENABLE(cabal,
[ --enable-cabal Enable use of Cabal packages in pluggable-1-branch
of GHC],
[ CABAL=1 ],
[ CABAL=0 ])
# used by the Makefile`s to alter dependencies.
if test "$MAJOR" -ge "6" -a "$MINOR" -ge "4"; then
CABAL=1
fi
AC_SUBST(CABAL)
# Allow a debugging version of hs-plugins to be built
AC_ARG_ENABLE(debug,
[ --enable-debug Enable a debug version of hs-plugins to be built],
[ DEBUG_OPTS=-DDEBUG ],
[ DEBUG_OPTS= ])
AC_SUBST(DEBUG_OPTS)
# allow user supplied haskell package manager
AC_ARG_WITH(ghc-pkg,
AC_HELP_STRING([--with-ghc-pkg=<ghc-pkg>],[use a specific ghc-pkg]),
[ GHCPKG="$withval"
if test ! -f "$GHCPKG" ; then
AC_MSG_ERROR([$GHCPKG not found. You need ghc-pkg])
fi
],
[ AC_CHECK_PROG(GHCPKG,ghc-pkg,ghc-pkg)
if test -z "$GHCPKG" ; then
AC_MSG_ERROR([You need ghc-pkg])
fi
]
)
AC_SUBST(GHCPKG)
AC_CHECK_PROG(HADDOCK,haddock,haddock)
if test -z "$HADDOCK" ; then
AC_MSG_WARN(You need Haddock if you want developer documentation)
fi
AC_CHECK_PROG(HAPPY,happy,happy)
if test -z "$HAPPY" ; then
AC_MSG_WARN(If you change or remove the parser you'll need Happy)
fi
AC_CHECK_PROG(ALEX,alex,alex)
if test -z "$ALEX" ; then
AC_MSG_WARN(If you change or remove the lexer files you'll need alex)
fi
AC_CHECK_PROG(LD,ld,ld)
if test -z "$LD" ; then
AC_MSG_WARN(You need ld -export-dynamic)
fi
AC_CHECK_PROG(AR,ar,ar)
if test -z "$AR" ; then
AC_MSG_WARN(You need ar to build the library)
fi
AC_CHECK_PROG(RANLIB,ranlib,ranlib)
if test -z "$RANLIB" ; then
AC_MSG_WARN(You need randlib to build the library)
fi
AC_CHECK_PROG(RM,rm,rm)
if test -z "$RM" ; then
AC_MSG_WARN(You need rm!)
fi
AC_CHECK_PROG(TEX,tex,tex)
if test -z "$TEX" ; then
AC_MSG_WARN(You'll need tex if you wish to build the documentation)
fi
AC_CHECK_PROG(TEX2PAGE,tex2page,tex2page)
if test -z "$TEX2PAGE" ; then
AC_MSG_WARN(You'll need tex2page if you wish to build the
documentation: http://www.ccs.neu.edu/home/dorai/tex2page/tex2page-doc.html)
fi
AC_CHECK_FUNC(arc4random, [SYMS="$SYMS -DHAVE_ARC4RANDOM"])
AC_SUBST(SYMS)
AC_PROG_INSTALL
AC_CONFIG_FILES(config.mk config.h)
AC_OUTPUT

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# Copyright (c) 2004 Don Stewart - http://www.cse.unsw.edu.au/~dons
# LGPL version 2.1 or later (see http://www.gnu.org/copyleft/lesser.html)
.PHONY: build clean html
SRC = hs-plugins
build: $(SRC).ps html
$(SRC).ps: $(SRC).dvi
dvips -f $(SRC).dvi > $@
html: $(SRC).tex
tex2page $(SRC)
tex2page $(SRC)
./munge.sed < $(SRC)/$(SRC).html > tmp.out
mv tmp.out $(SRC)/$(SRC).html
cp $(SRC)/$(SRC).html $(SRC)/index.html
tar czf $(SRC).html.tar.gz $(SRC)
mv $(SRC).html.tar.gz $(SRC)/
$(SRC).dvi: $(SRC).tex
latex $(SRC).tex && latex $(SRC).tex
CLEANS= *.{ps,dvi,aux,log} *~ hs-plugins *-Z-* *.toc
clean:
rm -rf $(CLEANS)
all: doc

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%%% This is a LaTeX2e style file.
%%%
%%% It supports setting functional languages like Haskell.
%%%
%%% Manuel M. T. Chakravarty <chak@cse.unsw.edu.au> [1998..2000]
%%%
%%% $Id: haskell.sty,v 1.2 2004/05/16 08:20:09 dons Exp $
%%%
%%% This file is free software; you can redistribute it and/or modify
%%% it under the terms of the GNU General Public License as published by
%%% the Free Software Foundation; either version 2 of the License, or
%%% (at your option) any later version.
%%%
%%% This file is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%%% GNU General Public License for more details.
%%%
%%% Acknowledegments ==========================================================
%%%
%%% Thanks to Gabriele Keller <keller@cs.tu-berlin.de> for beta testing and
%%% code contributions. Thanks to the LaTeX3 project for improving the LaTeX
%%% sources (which helped me writing this code). Furthermore, I am grateful
%%% to Martin Erwig <Martin.Erwig@FernUni-Hagen.de> for feedback and
%%% suggestions, and to Conal Elliott <conal@MICROSOFT.com> for pointing out
%%% a tricky bug.
%%%
%%% TODO ======================================================================
%%%
%%% B ~ bug; F ~ feature
%%%
%%% * F: Along the lines of the discussion with Martin Erwig add support for
%%% keywords etc (see the emails)
%%%
%%% * B: If we have as input
%%%
%%% \<map
%%% g\>
%%%
%%% there won't be a `\hsap' inserted!! (Can this be solved by using
%%% \obeylines in \<...\>?)
%%%
%%% * B: A \relax is needed after a & if it immediately followed by a \hsbody{}
%%% (See TeXbook, S.240)
%%%
%%% * F: Implement a \hstext{...} as \(\text{...}\).
%%%
%%% * We would like hswhere* etc that are like haskell* (\hsalign already
%%% supports this, ie, there is a \hsalign*).
%%%
%%% * Star-Versions of if, let etc that use a single line layout (maybe not
%%% with star, because of the above).
%%%
%%% * Support for enforcing and prohibiting breaks in `haskell' displays.
%%%
%%% * Comments in a let-in should be aligned in the same way for the bindings
%%% and the body.
%%%
%%% * It would be nice to have different styles (indentation after in of
%%% let-in or not) etc; either to be set with a package option or in the
%%% preamble (the latter probably makes more sense).
%%%
%%% * Literate programming facility: Variant of the `haskell' env (maybe
%%% `hschunk', which is named and can be used in other chunks). But maybe
%%% it is not necessary to provide a chunk-based reordering mechanism,
%%% because most of the Haskell stuff can be in any order anyway...
%%% Important is to provide a way to define visually pleasing layout
%%% together with the raw Haskell form for program output. (Maybe `haskell*'
%%% as Haskell env that outputs its contents?)
%%%
%% Initialization
%% ==============
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{haskell}[2000/10/05 v1.0e Chilli's Haskell Style]
%% Parameters
%% ==========
\newskip\hsmargin
\hsmargin\leftmargini
%% Main macros and environments
%% ============================
% applications
%
\newcommand{\hsap}{% % application by juxtaposition
\unskip\mskip 4mu plus 1mu} % only the last \hsap counts
% commands to start and stop setting spaces as \hsap
%
{\obeyspaces\gdef\@hsSpaceToApp{\obeyspaces\let =\hsap}} % spaces matter!!!
{\obeyspaces\gdef\@hsNormalSpace{\let =\space}}
% commands to start and stop treating numbers specially, ie, we don't want
% them to be affected by font changing commands in Haskell contexts as this
% would give italic numerals; the trick is to redefine their math code such
% that they go into math class 0 and thus don't change families (cf. `The
% TeXbook', Chapter 17, pp152)
%
\newcommand{\@hsRmNumbers}{%
\mathcode`0="0030
\mathcode`1="0031
\mathcode`2="0032
\mathcode`3="0033
\mathcode`4="0034
\mathcode`5="0035
\mathcode`6="0036
\mathcode`7="0037
\mathcode`8="0038
\mathcode`9="0039
}
\newcommand{\@hsNormalNumbers}{%
\mathcode`0="7030
\mathcode`1="7031
\mathcode`2="7032
\mathcode`3="7033
\mathcode`4="7034
\mathcode`5="7035
\mathcode`6="7036
\mathcode`7="7037
\mathcode`8="7038
\mathcode`9="7039
}
% Save the bindings of the standard math commands
%
% This is somewhat subtle as we want to able to enter the original math mode
% within Haskell mode and we have to ensure that the different opening
% commands are matched by the correct versions of the closing commands.
%
\let\@hsmathorg=\(
\let\@hsmathendorg=\)
\let\hs@crorg=\\
\newcommand{\@hsmath}{%
\relax\hbox\bgroup
\@hsNormalSpace
\@hsNormalNumbers
\let\(=\@hsmathorgx
\let\)=\@hsmathend
\def\\{\hs@crorg}%
\@hsmathorg
}
\newcommand{\@hsmathend}{%
\@hsmathendorg
\egroup
}
\newcommand{\@hsmathorgx}{%
\relax\@hsmathorg
\let\)=\@hsmathendorg
}
%% Typesetting of Haskell
%% ======================
% Inline Haskell phrases are delimited by `\<' and `\>'.
%
% Note: `\>' is only locally redefined.
%
\newcommand{\<}{%
\@hsmathorg
\mathit\bgroup
\@hsSpaceToApp
\@hsRmNumbers
\let\>=\@endhs
\let\(=\@hsmath
\def\\{\cr} % for Haskell alignments
}
\newcommand{\@endhs}{%
\egroup
\@hsmathendorg
}
% Displayed Haskell (environment `haskell' and `haskell*')
%
% There are two kind of preambles for \halign: \hs@preambleNorm is for
% `amsmath' style alignments and \hs@preambleStar for `equation' style
% alignments (but with an unbound number of columns to its right)
%
% We need #### to get a ## in the \edef building the \halign command.
%
% first the preambles (also used in \hs@align below):
%
\def\hs@preambleNorm{%
\noexpand\<####\unskip\noexpand\>\hfil&&\noexpand%
\<{}####\unskip\noexpand\>\hfil}
\def\hs@preambleStar{%
\noexpand\<####\unskip\noexpand\>\hfil&\hfil\noexpand%
\<{}####\unskip{}\noexpand\>\hfil&&\noexpand\<{}####\noexpand\>\hfil}
%
% the environments:
%
\newenvironment{haskell}{%
\@haskell\hs@preambleNorm}{%
\@endhaskell
}
\newenvironment{haskell*}{%
\@haskell\hs@preambleStar}{%
\@endhaskell
}
%
% auxiliary definition getting the preamble as its first argument and starting
% the environment:
%
\def\@haskell#1{%
\bgroup
\vspace\abovedisplayskip
\let\(=\@hsmath % Important when `\(' occurs after `&'!
\edef\@preamble{%
\halign\bgroup\hskip\hsmargin#1\cr}
\@preamble
}
%
% Auxiliary definition ending environment:
%
\def\@endhaskell{%
\crcr\egroup
\vspace\belowdisplayskip
\egroup\noindent\ignorespaces\global\@ignoretrue%
}
% single line comment and keyword style
%
\newcommand{\hscom}[1]{%
\relax\(\quad\textnormal{--- #1}\)}
\newcommand{\hskwd}[1]{%
\mathbf{#1}}
% informal description
%
\newcommand{\hsinf}[1]{%
\(\langle\textnormal{#1}\rangle\)}
% literals and some special symbols
%
\newcommand{\hschar}[1]{\textrm'\mathrm{#1}\textrm'} % character literals
\newcommand{\hsstr}[1]{"\mathrm{#1}"} % strings literals
\newcommand{\hsfrom}{\leftarrow} % <-
% aligned subphrases
%
% check for an optional star and combine prefix (in #1) with one of the two
% preambles (with star means to center the material between the first and
% second &)
%
\def\hs@align#1{%
\@ifstar
{\hs@align@pre{#1\hs@preambleStar}}%
{\hs@align@pre{#1\hs@preambleNorm}}%
}
%
% test for optional argument; #1: preamble
%
\def\hs@align@pre#1{%
\@testopt{\hs@align@prealign#1}t}
%
% got all arguments, now for the real code; #1: preamble; #2: alignment;
% #3: body (the material set by the \halign)
%
\def\hs@align@prealign#1[#2]#3{%
\relax\(
\edef\@preamble{%
\halign\bgroup#1\cr}
\if #2t\vtop \else \if#2b\vbox \else \vcenter \fi\fi
\bgroup%
\@preamble
#3%
\crcr\egroup%
\egroup\)
}
%
% user-level command: alignment without a prefix
%
\newcommand{\hsalign}{%
\relax
\hs@align\relax%
}
% subphrase breaking the surrounding alignment being flushed left
%
\newcommand{\hsnoalign}[1]{%
\noalign{%
\hs@align{\hskip\hsmargin}{#1}%
}%
}
% body expression breaking the surrounding alignment
%
% * setting \hsmargin to 0pt within the preamble (and _after_ it is used in
% the preamble) is crucial, as we want \hsmargin only to be applied in
% _outermost_ alignments
%
\newcommand{\hsbody}[1]{%
{}\\
\noalign{%
\hs@align{\hskip\hsmargin\quad\hsmargin0pt}{#1}%
}%
}
%% Defining commands for use in the Haskell mode
%% =============================================
%%
%% We use some of the low-level machinery defined in LaTeX's source file
%% `ltdefns.dtx'.
%%
%% \hscommand is similar to \newcommand, but there is no *-version.
%%
%% We use our own definitions here to insert a strategic `\relax' (see below)
%% and to obey spaces within the bodies of Haskell definitions.
\newcommand{\hscommand}[1]{\@testopt{\hs@newcommand#1}0}
\def\hs@newcommand#1[#2]{%
\obeyspaces % spaces count in Haskell macros
\@ifnextchar [{\hs@xargdef#1[#2]}%
{\hs@argdef#1[#2]}}
% All this trouble only to be able to add the `\relax' into the expansion
% process. If we don't that, commands without optional arguments when
% invoked after an alignment character & don't work properly (actually, the
% \obeyspaces doesn't work). I am sure that has to do with the scanning for
% \omit etc in \halign (TeXbook, p240), but I don't understand yet why it
% is problematic in this case.
%
% Furthermore, we switch off \obeyspaces in the end.
%
\long\def\hs@argdef#1[#2]#3{%
\@ifdefinable#1{%
\expandafter\def\expandafter#1\expandafter{%
\relax % in order to stop token expansion after &
\csname\string#1\expandafter\endcsname}%
\expandafter\@yargdef
\csname\string#1\endcsname
\@ne
{#2}%
{#3}}%
\catcode`\ =10% % stop obeying spaces now
}
% Switch off \obeyspaces in the end.
%
\long\def\hs@xargdef#1[#2][#3]#4{%
\@ifdefinable#1{%
\expandafter\def\expandafter#1\expandafter{%
\expandafter
\@protected@testopt
\expandafter
#1%
\csname\string#1\expandafter\endcsname
{#3}}%
\expandafter\@yargdef
\csname\string#1\endcsname
\tw@
{#2}%
{#4}}%
\catcode`\ =10% % stop obeying spaces now
}
%% Abbreviations
%% =============
% infix operators
%
\newcommand{\hsapp}{\mathbin{+\mkern-7mu+}}
\newcommand{\hsifix}[1]{\mathbin{\string`#1\string`}}
% let expression
%
\hscommand{\hslet}[3][t]{%
\hsalign[#1]{%
\hskwd{let}\\
\quad\hsalign{#2}\\
\hskwd{in}\\
#3
}%
}
% if expression
%
\hscommand{\hsif}[4][t]{%
\hsalign[#1]{%
\hskwd{if} #2 \hskwd{then}\\
\quad\hsalign{#3}\\
\hskwd{else}\\
\quad\hsalign{#4}%
}%
}
% case expression
%
\hscommand{\hscase}[3][t]{%
\hsalign[#1]{%
\hskwd{case} #2 \hskwd{of}\\
\quad\hsalign{#3}%
}%
}
% where clause
%
% * it is important to take the \quad into the preamble, so that nested
% \noaligns can break it
%
\hscommand{\hswhere}[1]{%
\hsbody{%
\hskwd{where}\\
\hs@align{\quad}{#1}%
}%
}
% do expression
%
\hscommand{\hsdo}[2][t]{%
\hsalign[#1]{%
\hskwd{do}\\
\quad\hsalign{#2}\\
}%
}
%% Extensions for Distributed Haskell (Goffin)
%% ===========================================
%%
%% These definitions may change in the future.
\hscommand{\hsunif}{\mathbin{:=:}}
\hscommand{\hsalias}{\mathrel{\sim}}
\hscommand{\hsoutof}{\twoheadleftarrow}
\hscommand{\hsinto}{\twoheadrightarrow}
\hscommand{\hsparc}{\binampersand}
\hscommand{\hsseq}{\Longrightarrow}
\hscommand{\hsex}[2]{{\hskwd{ex} #1 \hskwd{in} #2}}
\hscommand{\hsexin}[3][t]{%
\hsalign[#1]{%
\hskwd{ex} #2 \hskwd{in}\\
\quad\hsalign{#3}\\
}%
}
\hscommand{\hschoice}[2][t]{%
\hsalign[#1]{%
\hskwd{choice}\\
\quad\hsalign{#2}\\
}%
}

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.TH HS-PLUGINS 1 2005-03-26 "hs-plugins version 0.9.8" "User Manual"
.SH NAME
hs-plugins \- dynamic linker library for Haskell
.SH DESCRIPTION
.ds c \fIhs-plugins\fP
\*c is a library for loading plugins written in Haskell into an
application at runtime. It also provides a mechanism for (re)compiling
Haskell source at runtime. Thirdly, a combination of runtime compilation
and dynamic loading provides a suite of eval functions. Values exported
by plugins are transparently available to Haskell host applications, and
bindings exist to use Haskell plugins from at least C and Objective C
programs. hs-plugins requires ghc-6.2.2 or greater.
.SH DOCUMENTATION
The hs-plugins user manual is distributed in html format, and may be
found at <http://www.cse.unsw.edu.au/~dons/hs-plugins/>
.SH BUGS
Bug reports, and any other feedback, should be sent to
Don Stewart <dons@cse.unsw.edu.au>
.SH COPYRIGHT
Copyright \(co 2004-2005 Don Stewart
.PP
The hs-plugins library modules are distributed under the terms of the
LGPL.
.SH "SEE ALSO"
.BR dlopen (3)
.SH AUTHOR
This manual page was written by Don Stewart, based on the man page for
cpphs (written by Ian Lynagh).

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hs-plugins

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#!/usr/bin/sed -f
# de-boldify and <p>-ify the Contents.
/Contents/ {
:loop
/Go to/ {
b end
}
s,<p>,,
s,<b>,,
s,</b>,,
s,</p>,,
n
b loop
}
:end

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% tex2page.sty
% Dorai Sitaram
% Loading this file in a LaTeX document
% gives it all the macros of tex2page.tex,
% but via a more LaTeX-convenient filename.
\input{tex2page}

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These examples illustrate the various uses of hs-plugins.
conf a configuration file edsl using plugins
dynload dynamically typed load
eval runtime evaluation of haskell strings, from Haskell and C
hmake the 'plugs' haskell interpreter
iface test the interface file parser
load load a plugin
make build a Haskell file
makewith merge and build a Haskell file
multi load multiple plugins at once
objc load Haskell plugins into object C programs
pkgconf test package.conf parsing
popen test popen
reload reload a plugin when it changes
shell a simple string filter
unload test unloading of plugins

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Method:
* "pdynload"
comes from pdynload/small
* "load + ghc"
comes from pdynload/null, with lines 13-14
uncommented from prog/Main.hs
* "dynload"
from dynload/simple
* "load, no check"
from pdynload/null, with lines 13-14 of prog/Main.hs
commented out
For example, to run the "pdynload" test:
$ cd pdynload/small
$ make
$ make check # to prime caches, etc.
$ time make check
$ time make check
$ time make check # run 'time make check' until value converges
The converged value is entered into the "Raw" timings, and then the
scaled timing is calculated for each machine. These scaled values were
then averaged over the number of machines, yielding the final
"Average" scores -- the average over a number of machines and os.
Raw timing:
pdynload load+ghc dynload load, no check
0.33 0.25 0.22 0.21 -- P4 2.6 , OpenBSD
0.38 0.31 0.29 0.27 -- P4 2.66, Linux
0.84 0.77 0.64 0.55 -- Quad P4 2.4, Linux
0.76 0.60 0.52 0.50 -- AMD 1.1G, Linux
0.95 0.83 0.75 0.72 -- G5 2.0G, Mac OS X
-- Quad Itanium 1,Linux
Scaled:
1.57 1.19 1.05 1
1.40 1.15 1.07
1.52 1.4 1.16
1.52 1.2 1.04
1.32 1.15 1.04
Average:
=1.46 = 1.218 = 1.07

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# how to build the default projects
include $(TOP)/config.mk
include $(TOP)/examples/check.mk
BIN= prog/a.out
OBJ= prog/Main.o
SRC= prog/Main.hs
BINDIR= prog
REALBIN= ./a.out
API_OBJ= api/API.o
INCLUDES= -i$(TOP)/examples/$(TEST)/api
PKGFLAGS= -package-conf $(TOP)/plugins.conf.inplace -package plugins
GHCFLAGS= -Onot -cpp -fglasgow-exts
.SUFFIXES : .o .hs .hi .lhs .hc .s
all: $(BIN)
$(BIN) : $(PRIOR_OBJS) $(API_OBJ) $(SRC) $(EXTRA_OBJS)
@rm -f $@
@$(GHC) --make -o $@ $(INCLUDES) $(PKGFLAGS) $(GHCFLAGS) $(EXTRAFLAGS) $(API) $(SRC)
# Standard suffix rules
.o.hi:
@:
.hs.o:
@$(GHC) $(INCLUDES) $(PKGFLAGS) $(GHCFLAGS) $(EXTRAFLAGS) -c $<
clean:
find . -name '*~' -exec rm {} \;
rm -rf *.{o,hi,dep}
rm -rf */*.{hi,o,old} */a.out
rm -rf */*core
rm -rf */*.a
rm -rf */package.conf
rm -rf *.a

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include $(TOP)/config.mk
check: $(BIN)
@(cd $(BINDIR) ;\
expected="expected" ;\
if [ -f "expected" -o -f "expected.$(GLASGOW_HASKELL)" ] ;\
then \
actual_out="/tmp/hs-plugins-actual.out.$$$$" ;\
diff_out="/tmp/hs-plugins.diff.$$$$" ;\
$(REALBIN) > $$actual_out 2>&1 || true ;\
if [ -f "expected.$(GLASGOW_HASKELL)" ] ; then \
expected="expected.$(GLASGOW_HASKELL)" ;\
fi ;\
diff -u $$expected $$actual_out > $$diff_out || true ;\
if [ -s "$$diff_out" ] ; then \
echo "failed with:" ;\
cat "$$diff_out" | sed '1,3d' ;\
else \
echo "ok." ;\
fi ;\
rm $$actual_out $$diff_out ;\
else \
$(REALBIN) 2>&1 || true ;\
fi)

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import System.Directory
resource = mail {
-- editor = do b <- doesFileExist "/usr/bin/emacs"
-- return $ if b then "emacs" else "vi" ,
editor = do b <- doesFileExist "/bin/sh"
return "sh",
attribution = \name -> "Today, "++name++" wrote :"
}

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module Mailrc ( resource ) where
import API
resource :: Interface
resource = mail

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TEST= conf/simple
TOP=../../..
include ../../build.mk

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--
-- the configuration file interface.
--
module API where
data Color = Black | Grey | Green | Cyan | Yellow | Magenta | Red
data Interface = Interface {
editor :: IO String,
attribution :: String -> String,
header_color :: Color,
colorize :: [String],
include :: Bool
}
-- Default settings
mail :: Interface
mail = Interface {
editor = return "vi",
attribution = (\user -> user ++ " wrote:"),
header_color = Grey,
colorize = [],
include = True
}

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import Plugins
import API
conf = "../Mailrc.conf"
stub = "../Mailrc.stub"
apipath = "../api"
main = do
status <- makeWith conf stub ["-i"++apipath]
o <- case status of
MakeFailure e -> mapM_ putStrLn e >> error "failed"
MakeSuccess _ o -> return o
status <- load o [apipath] [] "resource"
v <- case status of
LoadFailure err -> mapM_ putStrLn err >> error "no"
LoadSuccess _ v -> return v
user_editor <- editor v
putStrLn user_editor
makeCleaner o

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sh

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TEST=dynload/io
EXTRA_OBJS=TestIO.o
TOP=../../..
include ../../build.mk

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{-# OPTIONS -fglasgow-exts -cpp #-}
--
-- Copyright (c) 2004 Don Stewart - http://www.cse.unsw.edu.au/~dons
-- LGPL version 2.1 or later (see http://www.gnu.org/copyleft/lesser.html)
--
module TestIO ( resource_dyn ) where
import API
import AltData
import System.IO
import System.Posix.Types ( ProcessID, Fd )
import System.Posix.Process ( forkProcess, executeFile, getProcessID )
import System.Posix.IO ( createPipe, stdInput,
stdOutput, fdToHandle, closeFd, dupTo )
resource_dyn :: Dynamic
resource_dyn = toDyn resource
resource :: TestIO
resource = testio { field = date }
--
-- call a shell command , returning it's output
--
date :: IO String
date = do (hdl,_,_) <- catch (popen "/bin/date") (\_->error "popen failed")
hGetLine hdl
------------------------------------------------------------------------
--
-- my implementation of $val = `cmd`; (if this was perl)
--
-- provide similar functionality to popen(3),
-- along with bidirectional ipc via pipes
-- return's the pid of the child process
--
-- there are two different forkProcess functions. the pre-620 was a
-- unix-fork style function, and the modern function has semantics more
-- like the Awkward-Squad paper. We provide implementations of popen
-- using both versions, depending on which GHC the user wants to try.
--
popen :: FilePath -> IO (Handle, Handle, ProcessID)
popen cmd = do
(pr, pw) <- createPipe
(cr, cw) <- createPipe
-- parent --
let parent = do closeFd cw
closeFd pr
-- child --
let child = do closeFd pw
closeFd cr
exec cmd (pr,cw)
error "exec cmd failed!" -- typing only
-- if the parser front end understood cpp, this would work
-- #if __GLASGOW_HASKELL__ >= 601
pid <- forkProcess child -- fork child
parent -- and run parent code
-- #else
-- p <- forkProcess
-- pid <- case p of
-- Just pid -> parent >> return pid
-- Nothing -> child
-- #endif
hcr <- fdToHandle cr
hpw <- fdToHandle pw
return (hcr,hpw,pid)
--
-- execve cmd in the child process, dup'ing the file descriptors passed
-- as arguments to become the child's stdin and stdout.
--
exec :: FilePath -> (Fd,Fd) -> IO ()
exec cmd (pr,cw) = do
dupTo pr stdInput
dupTo cw stdOutput
executeFile cmd False [] Nothing
------------------------------------------------------------------------

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{-# OPTIONS -fglasgow-exts #-}
module API where
import AltData
data TestIO = TestIO {
field :: IO String
}
instance Typeable TestIO where
#if __GLASGOW_HASKELL__ >= 603
typeOf i = mkTyConApp (mkTyCon "API.TestIO") []
#else
typeOf i = mkAppTy (mkTyCon "API.TestIO") []
#endif
testio :: TestIO
testio = TestIO { field = return "default value" }

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import Plugins
import API
main = do
m_v <- dynload "../TestIO.o" ["../api"]
["../../../../plugins.conf.inplace"] "resource_dyn"
case m_v of
LoadFailure _ -> error "couldn't compile"
LoadSuccess _ v -> do
s <- field v
if s /= [] then print True else print False

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True

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TEST=dynload/poly
EXTRA_OBJS=Plugin.o
TOP=../../..
include ../../build.mk

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module Plugin where
import API
import AltData
my_fun = plugin {
equals = \x y -> (x /= y) -- a strange equals function :)
}
resource_dyn :: Dynamic
resource_dyn = toDyn my_fun

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{-# OPTIONS -cpp #-}
module API where
import AltData
data Interface = Interface {
equals :: forall t. Eq t => t -> t -> Bool
}
--
-- see how it hides the internal type.. but to compile GHC still checks
-- the type.
--
instance Typeable Interface where
#if __GLASGOW_HASKELL__ >= 603
typeOf i = mkTyConApp (mkTyCon "API.Interface") []
#else
typeOf i = mkAppTy (mkTyCon "API.Interface") []
#endif
plugin :: Interface
plugin = Interface { equals = (==) }

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{-# OPTIONS -cpp #-}
#include "../../../../config.h"
import Plugins
import API
main = do
m_v <- dynload "../Plugin.o" ["../api"]
["../../../../plugins.conf.inplace"]
"resource_dyn"
case m_v of
LoadFailure _ -> error "didn't compile"
LoadSuccess _ (Interface eq) -> do
putStrLn $ show $ 1 `eq` 2
putStrLn $ show $ 'a' `eq` 'b'

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True
True

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TEST= dynload/should_fail
EXTRA_OBJS=Plugin.o
TOP=../../..
include ../../build.mk

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{-# OPTIONS -fglasgow-exts #-}
module Plugin where
import API
import AltData
v :: Int
v = 0xdeadbeef
resource_dyn :: Dynamic
resource_dyn = toDyn v

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{-# OPTIONS -fglasgow-exts #-}
module API where
import AltData
data Interface = Interface {
function :: String
}
instance Typeable Interface where
#if __GLASGOW_HASKELL__ >= 603
typeOf i = mkTyConApp (mkTyCon "API.Interface") []
#else
typeOf i = mkAppTy (mkTyCon "API.Interface") []
#endif
plugin :: Interface
plugin = Interface { function = "goodbye" }

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import Plugins
import API
main = do
m_v <- dynload "../Plugin.o"
["../api"]
["../../../../plugins.conf.inplace"]
"resource_dyn"
case m_v of
LoadFailure _ -> putStrLn "didn't compile"
LoadSuccess _ v -> putStrLn $ function v

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Couldn't match `API.Interface' against `Int'
Expected type: API.Interface
Inferred type: Int
didn't compile

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TEST= dynload/should_fail_1
EXTRA_OBJS=Plugin.o
TOP=../../..
include ../../build.mk

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--
-- trying to be really mean.
--
module Plugin where
import API
import AltData
v :: Int -> Int
v = \x -> 0xdeadbeef
resource_dyn :: Dynamic
resource_dyn = toDyn v

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{-# OPTIONS -fglasgow-exts #-}
module API where
import AltData
data Interface = Interface {
function :: String
}
instance Typeable Interface where
#if __GLASGOW_HASKELL__ >= 603
typeOf i = mkTyConApp (mkTyCon "API.Interface") []
#else
typeOf i = mkAppTy (mkTyCon "API.Interface") []
#endif
plugin :: Interface
plugin = Interface { function = "goodbye" }

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import Plugins
import API
main = do
m_v <- dynload "../Plugin.o" ["../api"]
["../../../../plugins.conf.inplace"] "resource_dyn"
case m_v of
LoadFailure _ -> putStrLn "didn't compile"
LoadSuccess _ v -> putStrLn $ (function v)

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Couldn't match `API.Interface' against `Int -> Int'
Expected type: API.Interface
Inferred type: Int -> Int
didn't compile

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TEST= dynload/should_fail_2
TOP=../../..
include ../../build.mk

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--
-- the plugin doesn't even make the resource_dyn a Dynamic.
--
-- let's hope that makeWith strips out the invalid declarations
--
{-# OPTIONS -fglasgow-exts #-}
module Plugin where
import API
import AltData
import GHC.Base
v :: Int
v = 0xdeadbeef
resource_dyn = (typeOf v, unsafeCoerce v)

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{-# OPTIONS -fglasgow-exts #-}
module Plugin ( resource_dyn ) where
import API
import AltData
resource = plugin
resource_dyn :: Dynamic
resource_dyn = toDyn resource

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{-# OPTIONS -fglasgow-exts #-}
module API where
import AltData
import GHC.Base
data Interface = Interface {
function :: String
}
instance Typeable Interface where
#if __GLASGOW_HASKELL__ >= 603
typeOf i = mkTyConApp (mkTyCon "API.Interface") []
#else
typeOf i = mkAppTy (mkTyCon "API.Interface") []
#endif
plugin :: Interface
plugin = Interface { function = "goodbye" }
unsafeCoerce = unsafeCoerce#

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import Plugins
import API
conf = "../Plugin.in"
stub = "../Plugin.stub"
main = do
status <- makeWith conf stub ["-i../api", "-i../../../../src/altdata/"]
case status of
MakeFailure e -> mapM_ putStrLn e >> putStrLn "failed"
MakeSuccess _ o -> do {
; m_v <- dynload o ["../api"] [] "resource_dyn"
; makeCleaner o
; case m_v of
LoadFailure _ -> putStrLn "didn't load"
LoadSuccess _ v -> putStrLn $ (function v)
}

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../Plugin.in:18:
Couldn't match `Dynamic' against `(t, t1)'
Expected type: Dynamic
Inferred type: (t, t1)
In the definition of `resource_dyn':
resource_dyn = (typeOf v, unsafeCoerce v)
failed

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../Plugin.in:18:15:
Couldn't match `Dynamic' against `(a, b)'
Expected type: Dynamic
Inferred type: (a, b)
In the definition of `resource_dyn': resource_dyn = (typeOf v, unsafeCoerce v)
failed

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TEST= dynload/should_fail_3
TOP=../../..
include ../../build.mk

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--
-- the plugin doesn't even make the resource_dyn a Dynamic.
-- let's hope that makeWith strips out the invalid declarations
--
{-# OPTIONS -fglasgow-exts #-}
module Plugin where
import API
import AltData
import GHC.Base
v :: Int
v = 0xdeadbeef
resource_dyn = (typeOf plugin, unsafeCoerce v)

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{-# OPTIONS -fglasgow-exts #-}
module Plugin ( resource_dyn ) where
import API
import AltData.Dynamic
resource = plugin
resource_dyn :: Dynamic
resource_dyn = toDyn resource

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{-# OPTIONS -cpp -fglasgow-exts #-}
module API where
import AltData
import GHC.Base
data Interface = Interface {
function :: String
}
instance Typeable Interface where
#if __GLASGOW_HASKELL__ >= 603
typeOf _ = mkTyConApp (mkTyCon "API.Interface") []
#else
typeOf _ = mkAppTy (mkTyCon "API.Interface") []
#endif
plugin :: Interface
plugin = Interface { function = "goodbye" }
unsafeCoerce = unsafeCoerce#

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import Plugins
import API
conf = "../Plugin.in"
stub = "../Plugin.stub"
main = do
status <- makeWith conf stub ["-i../api", "-i../../../../src/altdata"]
o <- case status of
MakeFailure e -> mapM_ putStrLn e >> error "failed"
MakeSuccess _ o -> return o
m_v <- dynload o ["../api"] [] "resource_dyn"
case m_v of
LoadFailure _ -> error "didn't compile"
LoadSuccess _ v -> do putStrLn $ (function v)
makeCleaner o

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../Plugin.in:18:
Couldn't match `Dynamic' against `(t, t1)'
Expected type: Dynamic
Inferred type: (t, t1)
In the definition of `resource_dyn':
resource_dyn = (typeOf plugin, unsafeCoerce v)
Fail: failed

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../Plugin.in:18:15:
Couldn't match `Dynamic' against `(a, b)'
Expected type: Dynamic
Inferred type: (a, b)
In the definition of `resource_dyn':
resource_dyn = (typeOf plugin, unsafeCoerce v)
a.out: failed

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TEST=dynload/simple
EXTRA_OBJS=Plugin.o
TOP=../../..
include ../../build.mk

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{-# OPTIONS -fglasgow-exts #-}
module Plugin where
import API
import AltData
my_fun = plugin { function = "plugin says \"hello\"" }
resource_dyn :: Dynamic
resource_dyn = toDyn my_fun

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{-# OPTIONS -cpp #-}
module API where
import AltData
data Interface = Interface {
function :: String
}
instance Typeable Interface where
#if __GLASGOW_HASKELL__ >= 603
typeOf i = mkTyConApp (mkTyCon "API.Interface") []
#else
typeOf i = mkAppTy (mkTyCon "API.Interface") []
#endif
plugin :: Interface
plugin = Interface { function = "goodbye" }

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{-# OPTIONS -cpp #-}
#include "../../../../config.h"
import Plugins
import API
main = do
m_v <- dynload "../Plugin.o" ["../api"]
["../../../../plugins.conf.inplace"]
"resource_dyn"
case m_v of
LoadFailure _ -> error "didn't compile"
LoadSuccess _ v -> putStrLn $ (function v)

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plugin says "hello"

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include $(TOP)/config.mk
include $(TOP)/examples/check.mk
PKGFLAGS= -package-conf $(TOP)/plugins.conf.inplace -package eval -package plugins -package printf
BIN=a.out
SRC=Main.hs
BINDIR= "."
REALBIN= ./$(BIN)
.SUFFIXES : .o .hs .hi .lhs .hc .s
all: $(BIN)
$(BIN): $(SRC) $(OBJS)
@rm -f $@
@$(GHC) --make -fglasgow-exts $(GHCFLAGS) $(PKGFLAGS) $(EXTRAFLAGS) $(SRC)
# Standard suffix rules
.o.hi:
@:
.hs.o:
@$(GHC) $(INCLUDES) $(PKGFLAGS) $(GHCFLAGS) $(EXTRAFLAGS) -c $<
clean:
rm -rf *.hi *.o *~ $(BIN)

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import Eval.Haskell
main = do i <- eval "1 + 6 :: Int" [] :: IO (Maybe Int)
if isJust i then putStrLn $ show (fromJust i) else return ()

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TOP=../../..
include ../../eval.mk

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7

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import Eval.Haskell
main = do m_s <- eval "map toUpper \"haskell\"" ["Data.Char"]
case m_s of
Nothing -> putStrLn "typechecking failed"
Just s -> putStrLn s

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TOP=../../..
include ../../eval.mk

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HASKELL

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{-# OPTIONS -cpp #-}
--
-- Should evaluate to '3', unless something goes wrong.
--
-- Not so bad to use AltData, as it is already derived for all the basic
-- types. Then, just replace deriving Typeable, with hand-derived
-- instance of Typeable (see hs-plugins/examples/eval/eval_fn1/Poly.hs
--
--
#include "../../../config.h"
import Eval.Haskell
import AltData.Dynamic
-- import Data.Dynamic
pkgconf = TOP ++ "/plugins.conf.inplace"
main = do
a <- return $ toDyn (3::Int)
m_b <- unsafeEval_ "\\dyn -> fromMaybe (7 :: Int) (fromDyn dyn)"
["AltData.Dynamic","Data.Maybe"] -- imports
[ "-package-conf "++pkgconf , "-package altdata" ]
[ pkgconf ]
[]
{-
-- should work, but doesn't. type check fails
-- (due to static vs dynamic typing issue)
m_b <- unsafeEval_ "\\dyn -> fromMaybe (7 :: Int) (fromDynamic dyn)"
["Data.Dynamic","Data.Maybe"] [] []
-}
case m_b of
Left s -> mapM_ putStrLn s
Right b -> putStrLn $ show (b a :: Int)

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TOP=../../..
include ../../eval.mk

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3

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import Eval.Haskell
main = do i <- eval_ "Just (7 :: Int)"
["Maybe"]
["-fglasgow-exts"]
[]
[] :: IO (Either [String] (Maybe (Maybe Int)))
print i

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TOP=../../..
include ../../eval.mk

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Right (Just (Just 7))

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--
-- lambda abstraction!
--
--
-- needs unsafeEval because eval has a broken Dynamic check
--
import Eval.Haskell
main = do fn <- unsafeEval "(\\(x::Int) -> (x,x))" [] :: IO (Maybe (Int -> (Int,Int)))
when (isJust fn) $ putStrLn $ show $ (fromJust fn) 7

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TOP=../../..
include ../../eval.mk

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(7,7)

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{-# OPTIONS -fglasgow-exts #-}
--
-- polymorphic eval!
--
module Main where
import Poly
import Eval.Haskell
main = do m_f <- eval "Fn (\\x y -> x == y)" ["Poly"]
when (isJust m_f) $ do
let (Fn f) = fromJust m_f
putStrLn $ show (f True True)
putStrLn $ show (f 1 2)

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TOP=../../..
include ../../eval.mk

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{-# OPTIONS -cpp -fglasgow-exts #-}
module Poly where
import AltData.Typeable
data Fn = Fn {fn :: forall t. Eq t => t -> t -> Bool}
--
-- ignore type inside the Fn... is this correct?
--
instance Typeable Fn where
#if __GLASGOW_HASKELL__ >= 603
typeOf _ = mkTyConApp (mkTyCon "Poly.Fn") []
#else
typeOf _ = mkAppTy (mkTyCon "Poly.Fn") []
#endif

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True
False

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TOP=../../..
include ../../foreign.mk

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run a string of Haskell code from a C program.

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10946

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#include <stdio.h>
#include "EvalHaskell.h"
int main(int argc, char *argv[])
{
int *p;
hs_init(&argc, &argv);
p = hs_eval_i("let fibs = 1:1:zipWith (+) fibs (tail fibs) in fibs !! 20 :: Int");
if (p == NULL)
printf("failed!\n");
else
printf("%d\n",*p);
hs_exit();
return 0;
}

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TOP=../../..
include ../../foreign.mk

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10946

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#include <stdio.h>
#include "EvalHaskell.h"
int main(int argc, char *argv[])
{
char *p;
hs_init(&argc, &argv);
p = hs_eval_s("show $ let fibs = 1:1:zipWith (+) fibs (tail fibs) in fibs !! 20");
if (p == NULL)
printf("failed!\n");
else
printf("%s\n",p);
hs_exit();
return 0;
}

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TOP=../../..
include ../../foreign.mk

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<eval>:1: parse error on input `in'
failed!

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failed!

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