[gforth] / gforth / libcc.fs  

gforth: gforth/libcc.fs

Diff for /gforth/libcc.fs between version 1.12 and 1.71

version 1.12, Wed Apr 25 22:11:29 2007 UTC version 1.71, Mon Jul 2 21:59:10 2012 UTC
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 \ libcc.fs      foreign function interface implemented using a C compiler  \ libcc.fs      foreign function interface implemented using a C compiler
   
 \ Copyright (C) 2006 Free Software Foundation, Inc.  \ Copyright (C) 2006,2007,2008,2009,2010,2011 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
 \ Gforth is free software; you can redistribute it and/or  \ Gforth is free software; you can redistribute it and/or
 \ modify it under the terms of the GNU General Public License  \ modify it under the terms of the GNU General Public License
 \ as published by the Free Software Foundation; either version 2  \ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.  \ of the License, or (at your option) any later version.
   
 \ This program is distributed in the hope that it will be useful,  \ This program is distributed in the hope that it will be useful,
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 \ GNU General Public License for more details.  \ GNU General Public License for more details.
   
 \ You should have received a copy of the GNU General Public License  \ You should have received a copy of the GNU General Public License
 \ along with this program; if not, write to the Free Software  \ along with this program. If not, see http://www.gnu.org/licenses/.
 \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.  
   
   
 \ What this implementation does is this: if it sees a declaration like  \ What this implementation does is this: if it sees a declaration like
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 \ wrapper again.  This is all done by loading the index file(s?),  \ wrapper again.  This is all done by loading the index file(s?),
 \ which define words for the wrappers in a separate wordlist.  \ which define words for the wrappers in a separate wordlist.
   
 \ The files are built in .../lib/gforth/$VERSION/libcc/ or  \ The files are built in .../lib/gforth$ARCH/$VERSION/libcc/ or
 \ ~/.gforth/libcc/$HOST/.  \ ~/.gforth$ARCH/libcc/$HOST/.
   
 \ other things to do:  \ Todo: conversion between function pointers and xts (both directions)
   
 \ c-variable forth-name c-name  \ taking an xt and turning it into a function pointer:
 \ c-constant forth-name c-name  
   \ e.g., assume we have the xt of + and want to create a C function int
   \ gforth_callback_plus(int, int), and then pass the pointer to that
   \ function:
   
   \ There should be Forth code like this:
   \   ] + 0 (bye)
   \ Assume that the start of this code is START
   
   \ Now, there should be a C function:
   
   \ int gforth_callback_plus(int p1, int p2)
   \ {
   \   Cell   *sp = gforth_SP;
   \   Float  *fp = gforth_FP;
   \   Float  *fp = gforth_FP;
   \   Address lp = gforth_LP;
   \   sp -= 2;
   \   sp[0] = p1;
   \   sp[1] = p2;
   \   gforth_engine(START, sp, rp, fp, lp);
   \   sp += 1;
   \   gforth_RP = rp;
   \   gforth_SP = sp;
   \   gforth_FP = fp;
   \   gforth_LP = lp;
   \   return sp[0];
   \ }
   
   \ and the pointer to that function is the C function pointer for the XT of +.
   
   \ Future problems:
   \   how to combine the Forth code generation with inlining
   \   START is not a constant across executions (when caching the C files)
   \      Solution: make START a variable, and store into it on startup with dlsym
   
   \ Syntax:
   \  callback <rettype> <params> <paramtypes> -- <rettype>
   
   
 \ data structures  \ data structures
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 \ first-time word, then to the run-time word; the run-time word calls  \ first-time word, then to the run-time word; the run-time word calls
 \ the c function.  \ the c function.
   
   [ifundef] parse-name
       ' parse-word alias parse-name
   [then]
   [ifundef] defer!
   : defer! ( xt xt-deferred -- ) \ gforth  defer-store
   \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
       >body [ has? rom [IF] ] @ [ [THEN] ] ! ;
   [then]
   
 require struct.fs  \ : delete-file 2drop 0 ;
   
     \ counted-string  require struct.fs
   require mkdir.fs
   
 \ c-function-ft word body:  \ c-function-ft word body:
 struct  struct
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     cell% field cff-deferred \ xt of c-function deferred word      cell% field cff-deferred \ xt of c-function deferred word
     cell% field cff-lha \ address of the lib-handle for the lib that      cell% field cff-lha \ address of the lib-handle for the lib that
                         \ contains the wrapper function of the word                          \ contains the wrapper function of the word
       char% field cff-ctype  \ call type (function=1, value=0)
     char% field cff-rtype  \ return type      char% field cff-rtype  \ return type
     char% field cff-np     \ number of parameters      char% field cff-np     \ number of parameters
     1 0   field cff-ptypes \ #npar parameter types      1 0   field cff-ptypes \ #npar parameter types
     \  counted string: c-name      \  counted string: c-name
 end-struct cff%  end-struct cff%
   
   variable c-source-file-id \ contains the source file id of the current batch
   0 c-source-file-id !
   variable lib-handle-addr \ points to the library handle of the current batch.
                            \ the library handle is 0 if the current
                            \ batch is not yet compiled.
     here 0 , lib-handle-addr ! \ just make sure LIB-HANDLE always works
   2variable lib-filename   \ filename without extension
   2variable lib-modulename \ basename of the file without extension
   2variable libcc-named-dir-v \ directory for named libcc wrapper libraries
   Variable libcc-path      \ pointer to path of library directories
   
   defer replace-rpath ( c-addr1 u1 -- c-addr2 u2 )
   ' noop is replace-rpath
   
 : .nb ( n -- )  : .nb ( n -- )
     0 .r ;      0 .r ;
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     c c-addr1 c!      c c-addr1 c!
     c-addr1 u1 1 /string ;      c-addr1 u1 1 /string ;
   
 \ linked list stuff (should go elsewhere)  : s+ { addr1 u1 addr2 u2 -- addr u }
       u1 u2 + allocate throw { addr }
       addr1 addr u1 move
       addr2 addr u1 + u2 move
       addr u1 u2 +
   ;
   
 hex  : append { addr1 u1 addr2 u2 -- addr u }
       addr1 u1 u2 + dup { u } resize throw { addr }
       addr2 addr u1 + u2 move
       addr u ;
   
   \ linked list stuff (should go elsewhere)
   
 struct  struct
     cell% field list-next      cell% field list-next
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             node list-next @              node list-next @
     repeat ;      repeat ;
   
   2variable c-libs \ library names in a string (without "lib")
   
   : add-lib ( c-addr u -- ) \ gforth
   \G Add library lib@i{string} to the list of libraries, where
       \G @i{string} is represented by @i{c-addr u}.
       c-libs 2@ d0= IF  0 allocate throw 0 c-libs 2!  THEN
       c-libs 2@ s"  -l" append 2swap append c-libs 2! ;
   
   : add-libpath ( c-addr u -- ) \ gforth
   \G Add path @i{string} to the list of library search pathes, where
       \G @i{string} is represented by @i{c-addr u}.
       c-libs 2@ d0= IF  0 allocate throw 0 c-libs 2!  THEN
       c-libs 2@ s"  -L" append 2swap append c-libs 2! ;
   
 \ C prefix lines  \ C prefix lines
   
 \ linked list of longcstrings: [ link | count-cell | characters ]  \ linked list of longcstrings: [ link | count-cell | characters ]
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 variable c-prefix-lines 0 c-prefix-lines !  variable c-prefix-lines 0 c-prefix-lines !
 variable c-prefix-lines-end c-prefix-lines c-prefix-lines-end !  variable c-prefix-lines-end c-prefix-lines c-prefix-lines-end !
   
 : save-c-prefix-line ( c-addr u -- )  
     align here 0 , c-prefix-lines-end list-append ( c-addr u )  
     longstring, ;  
   
 : \c ( "rest-of-line" -- )  
     -1 parse save-c-prefix-line ;  
   
 : print-c-prefix-line ( node -- )  : print-c-prefix-line ( node -- )
     dup c-prefix-chars swap c-prefix-count @ type cr ;      dup c-prefix-chars swap c-prefix-count @ type cr ;
   
 : print-c-prefix-lines ( -- )  : print-c-prefix-lines ( -- )
     c-prefix-lines @ ['] print-c-prefix-line list-map ;      c-prefix-lines @ ['] print-c-prefix-line list-map ;
   
 \c #include "engine/libcc.h"  : write-c-prefix-line ( c-addr u -- )
       c-source-file-id @ dup if
           write-line throw
       else
           drop 2drop
       then ;
   
   : save-c-prefix-line1 ( c-addr u -- )
       2dup write-c-prefix-line
       align here 0 , c-prefix-lines-end list-append ( c-addr u )
       longstring, ;
   
   defer save-c-prefix-line ( c-addr u -- )
   ' save-c-prefix-line1 is save-c-prefix-line
   
   : \c ( "rest-of-line" -- ) \ gforth backslash-c
       \G One line of C declarations for the C interface
       -1 parse save-c-prefix-line ;
   
   s" #include <gforth" arch-modifier s+ s" /" s+ version-string s+ s" /libcc.h>" append ( c-addr u )
     2dup save-c-prefix-line drop free throw
   
 \ Types (for parsing)  \ Types (for parsing)
   
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 set-current  set-current
   
 : parse-libcc-type ( "libcc-type" -- u )  \ call types
     parse-name libcc-types search-wordlist 0= -13 and throw execute ;  0
   const+ c-func
   const+ c-val
   const+ c-var
   drop
   
 : parse-function-types ( "{libcc-type}" "--" "libcc-type" -- )  : libcc-type ( c-addr u -- u2 )
     here 2 chars allot here begin          libcc-types search-wordlist 0= -13 and throw execute ;
   
   : parse-libcc-type ( "libcc-type" -- u )  parse-name libcc-type ;
   
   : parse-return-type ( "libcc-type" -- u )
           parse-libcc-type dup 0< -32 and throw ;
   
   : parse-function-types ( "{libcc-type}" "--" "libcc-type" -- addr )
       c-func c, here
       dup 2 chars allot here begin
         parse-libcc-type dup 0>= while          parse-libcc-type dup 0>= while
             c,              c,
     repeat      repeat
     drop here swap - over char+ c!      drop here swap - over char+ c!
     parse-libcc-type dup 0< -32 and throw swap c! ;      parse-return-type swap c! ;
   
   : parse-value-type ( "{--}" "libcc-type" -- addr )
       c-val c, here
       parse-libcc-type  dup 0< if drop parse-return-type then
       c,  0 c, ;
   
   : parse-variable-type ( -- addr )
           c-var c, here
           s" a" libcc-type c,  0 c, ;
   
 : type-letter ( n -- c )  : type-letter ( n -- c )
     chars s" nadrfv" drop + c@ ;      chars s" nadrfv" drop + c@ ;
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 \ the call itself  \ the call itself
   
 : gen-wrapped-call { d: pars d: c-name fp-change1 sp-change1 -- }  : gen-wrapped-func { d: pars d: c-name fp-change1 sp-change1 -- }
     c-name type ." ("      c-name type ." ("
     fp-change1 sp-change1 pars over + swap u+do      fp-change1 sp-change1 pars over + swap u+do
         i c@ gen-par          i c@ gen-par
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     loop      loop
     2drop ." )" ;      2drop ." )" ;
   
   : gen-wrapped-const { d: pars d: c-name fp-change1 sp-change1 -- }
           ." (" c-name type ." )" ;
   
   : gen-wrapped-var { d: pars d: c-name fp-change1 sp-change1 -- }
           ." &(" c-name type ." )" ;
   
   create gen-call-types
   ' gen-wrapped-func ,
   ' gen-wrapped-const ,
   ' gen-wrapped-var ,
   
   : gen-wrapped-call ( pars c-name fp-change1 sp-change1 -- )
           5 pick 3 chars - c@ cells gen-call-types + @ execute ;
   
 \ calls for various kinds of return values  \ calls for various kinds of return values
   
 : gen-wrapped-void ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )  : gen-wrapped-void ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
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     ." ," gen-par-n ." ," gen-par-n ." )" ;      ." ," gen-par-n ." ," gen-par-n ." )" ;
   
 : gen-wrapped-r ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )  : gen-wrapped-r ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
     2dup gen-par-r 2>r ." =" gen-wrapped-void 2r> ;      2dup gen-par-r 2>r ." =" gen-wrapped-call 2r> ;
   
 : gen-wrapped-func ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )  : gen-wrapped-func ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
     gen-wrapped-a ;      gen-wrapped-a ;
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 : gen-wrapper-function ( addr -- )  : gen-wrapper-function ( addr -- )
     \ addr points to the return type index of a c-function descriptor      \ addr points to the return type index of a c-function descriptor
     dup { descriptor }      dup { descriptor }
     c@+ { ret } count 2dup { d: pars } chars + count { d: c-name }      count { ret } count 2dup { d: pars } chars + count { d: c-name }
     ." void " descriptor wrapper-function-name 2dup type drop free throw      ." void "
     .\" (void)\n"      [ lib-suffix s" .la" str= [IF] ] lib-modulename 2@ type ." _LTX_" [ [THEN] ]
       descriptor wrapper-function-name 2dup type drop free throw
       .\" (GFORTH_ARGS)\n"
     .\" {\n  Cell MAYBE_UNUSED *sp = gforth_SP;\n  Float MAYBE_UNUSED *fp = gforth_FP;\n  "      .\" {\n  Cell MAYBE_UNUSED *sp = gforth_SP;\n  Float MAYBE_UNUSED *fp = gforth_FP;\n  "
     pars c-name 2over count-stacks ret gen-wrapped-stmt .\" ;\n"      pars c-name 2over count-stacks ret gen-wrapped-stmt .\" ;\n"
     ?dup-if      ?dup-if
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     endif      endif
     .\" }\n" ;      .\" }\n" ;
   
 variable c-source-file-id \ contains the source file id of the current batch  : scan-back { c-addr u1 c -- c-addr u2 }
 0 c-source-file-id !      \ the last occurence of c in c-addr u1 is at u2-1; if it does not
 variable lib-handle-addr \ points to the library handle of the current batch.      \ occur, u2=0.
                          \ the library handle is 0 if the current      c-addr 1- c-addr u1 + 1- u-do
                          \ batch is not yet compiled.          i c@ c = if
               c-addr i over - 1+ unloop exit endif
       1 -loop
       c-addr 0 ;
   
   : dirname ( c-addr1 u1 -- c-addr2 u2 )
       \ directory name of the file name c-addr1 u1, including the final "/".
       '/ scan-back ;
   
   : basename ( c-addr1 u1 -- c-addr2 u2 )
       \ file name without directory component
       2dup dirname nip /string ;
   
   : gen-filename ( x -- c-addr u )
       \ generates a file basename for lib-handle-addr X
       0 <<# ['] #s $10 base-execute #>
       s" gforth_c_" 2swap s+ #>> ;
   
   : libcc-named-dir ( -- c-addr u )
       libcc-named-dir-v 2@ ;
   
   : libcc-tmp-dir ( -- c-addr u )
       s" ~/.gforth" arch-modifier s+ s" /libcc-tmp/" s+ ;
   
   : prepend-dirname ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 )
       2over s+ 2swap drop free throw ;
   
   : open-wrappers ( -- addr|0 )
       lib-filename 2@ lib-suffix s+
       2dup libcc-named-dir string-prefix? if ( c-addr u )
           \ see if we can open it in the path
           libcc-named-dir nip /string
           libcc-path open-path-file if
               0 exit endif
           ( wfile-id c-addr2 u2 ) rot close-file throw save-mem ( c-addr2 u2 )
       endif
       \ 2dup cr type
       2dup open-lib >r
       drop free throw r> ;
   
   : c-library-name-setup ( c-addr u -- )
       assert( c-source-file-id @ 0= )
       { d: filename }
       here 0 , lib-handle-addr ! filename lib-filename 2!
       filename basename lib-modulename 2!
       ['] write-c-prefix-line is save-c-prefix-line ;
   
   : c-library-name-create ( -- )
       lib-filename 2@ s" .c" s+ 2dup w/o create-file throw
       c-source-file-id !
       drop free throw ;
   
   : c-named-library-name ( c-addr u -- )
       \ set up filenames for a (possibly new) library; c-addr u is the
       \ basename of the library
       libcc-named-dir prepend-dirname c-library-name-setup
       open-wrappers dup if
           lib-handle-addr @ !
       else
           libcc-named-dir $1ff mkdir-parents drop
           drop c-library-name-create
           c-prefix-lines @ ['] print-c-prefix-line \ first line only
           c-source-file-id @ outfile-execute
       endif ;
   
   : c-tmp-library-name ( c-addr u -- )
       \ set up filenames for a new library; c-addr u is the basename of
       \ the library
       libcc-tmp-dir 2dup $1ff mkdir-parents drop
       prepend-dirname c-library-name-setup c-library-name-create
       ['] print-c-prefix-lines c-source-file-id @ outfile-execute ;
   
   : lib-handle ( -- addr )
       lib-handle-addr @ @ ;
   
 : init-c-source-file ( -- )  : init-c-source-file ( -- )
       lib-handle 0= if
     c-source-file-id @ 0= if      c-source-file-id @ 0= if
         s" xxx.c" w/o create-file throw dup c-source-file-id !              here gen-filename c-tmp-library-name
         ['] print-c-prefix-lines swap outfile-execute          endif
         here 0 , lib-handle-addr !  
     endif ;      endif ;
   
 : c-source-file ( -- file-id )  : c-source-file ( -- file-id )
     c-source-file-id @ assert( dup ) ;      c-source-file-id @ assert( dup ) ;
   
 : compile-wrapper-function ( -- )  : notype-execute ( ... xt -- ... )
       what's type { oldtype } try
           ['] 2drop is type execute 0
       restore
           oldtype is type
       endtry
       throw ;
   
   : c-source-file-execute ( ... xt -- ... )
       \ direct the output of xt to c-source-file, or nothing
       lib-handle if
           notype-execute
       else
           c-source-file outfile-execute
       endif ;
   
   : .lib-error ( -- )
       [ifdef] lib-error
           ['] cr stderr outfile-execute
           lib-error ['] type stderr outfile-execute
       [then] ;
   
   DEFER compile-wrapper-function ( -- )
   : compile-wrapper-function1 ( -- )
       lib-handle 0= if
     c-source-file close-file throw      c-source-file close-file throw
     0 c-source-file-id !      0 c-source-file-id !
     s" gcc -fPIC -shared -Wl,-soname,xxx.so.1 -Wl,-export_dynamic -o xxx.so.1 -O xxx.c" system          [ libtool-command s"  --silent --tag=CC --mode=compile " s+
     $? abort" compiler generated error"            libtool-cc append s"  -I '" append
     s" /home/anton/gforth/xxx.so.1" open-lib dup 0= abort" open-lib failed"            s" includedir" getenv append  s" '" append ] sliteral
     ( lib-handle ) lib-handle-addr @ ! ;          s"  -O -c " s+ lib-filename 2@ append s" .c -o " append
           lib-filename 2@ append s" .lo" append ( c-addr u )
           \    2dup type cr
           2dup system drop free throw $? abort" libtool compile failed"
           [ libtool-command s"  --silent --tag=CC --mode=link " s+
             libtool-cc append libtool-flags append s"  -module -rpath " s+ ] sliteral
           lib-filename 2@ dirname replace-rpath s+ s"  " append
           lib-filename 2@ append s" .lo -o " append
           lib-filename 2@ append s" .la" append ( c-addr u )
           c-libs 2@ append
           \    2dup type cr
           2dup system drop free throw $? abort" libtool link failed"
           open-wrappers dup 0= if
               .lib-error true abort" open-lib failed"
           endif
           ( lib-handle ) lib-handle-addr @ !
       endif
       lib-filename 2@ drop free throw 0 0 lib-filename 2! ;
   ' compile-wrapper-function1 IS compile-wrapper-function
 \    s" ar rcs xxx.a xxx.o" system  \    s" ar rcs xxx.a xxx.o" system
 \    $? abort" ar generated error" ;  \    $? abort" ar generated error" ;
   
 : link-wrapper-function { cff -- sym }  : link-wrapper-function { cff -- sym }
     cff cff-rtype wrapper-function-name { d: wrapper-name }      cff cff-rtype wrapper-function-name { d: wrapper-name }
     wrapper-name cff cff-lha @ @ assert( dup ) lib-sym dup 0= -&32 and throw      wrapper-name cff cff-lha @ @ assert( dup ) lib-sym dup 0= if
           .lib-error -&32 throw
       endif
     wrapper-name drop free throw ;      wrapper-name drop free throw ;
   
 : c-function-ft ( xt-defr xt-cfr "c-name" "{libcc-type}" "--" "libcc-type" -- )  : c-function-ft ( xt-defr xt-cfr xt-parse "c-name" "type signature" -- )
     \ build time/first time action for c-function      \ build time/first time action for c-function
     init-c-source-file      { xt-parse-types } init-c-source-file
     noname create 2, lib-handle-addr @ ,      noname create 2, lib-handle-addr @ ,
     parse-name { d: c-name }      parse-name { d: c-name }
     here parse-function-types c-name string,      xt-parse-types execute c-name string,
     ['] gen-wrapper-function c-source-file outfile-execute      ['] gen-wrapper-function c-source-file-execute
   does> ( ... -- ... )    does> ( ... -- ... )
     dup 2@ { xt-defer xt-cfr }      dup 2@ { xt-defer xt-cfr }
     dup cff-lha @ @ 0= if      dup cff-lha @ @ 0= if
Line 400 
Line 651 
   does> ( ... -- ... )    does> ( ... -- ... )
     @ call-c ;      @ call-c ;
   
 : c-function ( "forth-name" "c-name" "{libcc-type}" "--" "libcc-type" -- )  : (c-function) ( xt-parse "forth-name" "c-name" "{stack effect}" -- )
     defer lastxt dup c-function-rt lastxt c-function-ft      { xt-parse-types } defer lastxt dup c-function-rt
       lastxt xt-parse-types c-function-ft
     lastxt swap defer! ;      lastxt swap defer! ;
   
 s" Library not found" exception constant err-nolib  : c-function ( "forth-name" "c-name" "@{type@}" "---" "type" -- ) \ gforth
       \G Define a Forth word @i{forth-name}.  @i{Forth-name} has the
 : library ( "name" "file" -- ) \ gforth      \G specified stack effect and calls the C function @code{c-name}.
 \G Dynamically links the library specified by @i{file}.  Defines a      ['] parse-function-types (c-function) ;
 \G word @i{name} ( -- lib ) that starts the declaration of a  
 \G function from that library.  : c-value ( "forth-name" "c-name" "---" "type" -- ) \ gforth
     create parse-name open-lib dup 0= err-nolib and throw ,      \G Define a Forth word @i{forth-name}.  @i{Forth-name} has the
   does> ( -- lib )      \G specified stack effect and gives the C value of @code{c-name}.
     @ ;      ['] parse-value-type (c-function) ;
   
 \ test  : c-variable ( "forth-name" "c-name" -- ) \ gforth
       \G Define a Forth word @i{forth-name}.  @i{Forth-name} returns the
 \ test all parameter and return types      \G address of @code{c-name}.
       ['] parse-variable-type (c-function) ;
 \ cr .( #include "engine/libcc.h")  
 \ cr .( #include <unistd.h>)  : clear-libs ( -- ) \ gforth
 \ cr ." typedef void (* func)(int);  \G Clear the list of libs
 \ cr ." int test1(int,char*,long,double,void (*)(int));"      c-source-file-id @ if
 \ cr ." Cell *test2(void);"          compile-wrapper-function
 \ cr ." int test3(void);"      endif
 \ cr ." float test4(void);"      0. c-libs 2! ;
 \ cr ." func test5(void);"  clear-libs
 \ cr ." void test6(void);"  
 \ cr  
   
 \ c-function dlseek lseek n d n -- d  : c-library-incomplete ( -- )
 \ c-function n test1 n a d r func -- n      true abort" Called function of unfinished named C library" ;
 \ c-function a test2 -- a  
 \ c-function d test3 -- d  
 \ c-function r test4 -- r  
 \ c-function func test5 -- func  
 \ c-function void test6 -- void  
   
 \c #include <string.h>  : c-library-name ( c-addr u -- ) \ gforth
 \c #include <stdlib.h>  \G Start a C library interface with name @i{c-addr u}.
       clear-libs
       ['] c-library-incomplete is compile-wrapper-function
       c-named-library-name ;
   
   : c-library ( "name" -- ) \ gforth
   \G Parsing version of @code{c-library-name}
       parse-name save-mem c-library-name ;
   
   : end-c-library ( -- ) \ gforth
   \G Finish and (if necessary) build the latest C library interface.
       ['] save-c-prefix-line1 is save-c-prefix-line
       ['] compile-wrapper-function1 is compile-wrapper-function
       compile-wrapper-function1 ;
   
   : init-libcc ( -- )
       s" ~/.gforth" arch-modifier s+ s" /libcc-named/" s+ libcc-named-dir-v 2!
   [IFDEF] $init
       libcc-path $init
       libcc-named-dir libcc-path also-path
       [ s" libccdir" getenv ] sliteral libcc-path also-path
   [THEN]
   ;
   
 c-function strlen strlen a -- n  init-libcc
 c-function labs labs n -- n  
   
 cr s\" fooo\0" 2dup dump drop .s strlen cr .s drop cr  :noname ( -- )
 -5 labs .s drop cr      defers 'cold
       init-libcc ;
   is 'cold

Generate output suitable for use with a patch program
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  Added in v.1.71
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