Powered by ViewCVS 1.0-dev
added libcc.fs
\ libcc.fs foreign function interface implemented using a C compiler
\ Copyright (C) 2006 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth 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 program 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.
\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
\ What this implementation does is this: if it sees a declaration like
\ libc dlseek int dlong int (dlong) lseek ( fd doffset whence -- doffset2 )
\ it genererates C code similar to the following:
\ #include <gforth.h>
\
\ void gforth_call_dl_i_dl_i(void)
\ {
\ Cell *sp = gforth_SP;
\ Float *fp = gforth_FP;
\ long (*func)(int, long, int);
\ int arg1;
\ long arg2;
\ int arg3;
\ long result;
\ func = (char *)((Cell *)sp)[0];
\ arg3 = ((Cell *)sp)[1];
\ arg2 = gforth_d2ll(sp[3],sp[2]);
\ arg1 = ((Cell *)sp)[4];
\ result = func(arg1, arg2, arg3);
\ gforth_ll2d(result, sp[4], sp[3]);
\ gforth_SP += 3;
\ }
\ Then it compiles this code and dynamically links it into the Gforth
\ system (batching and caching are future work). It also dynamically
\ links lseek. Performing DLSEEK then puts the function pointer of
\ lseek() on the stack, the function pointer of
\ gforth_call_del_i_dl_i, and calls CALL-C.
s" Library not found" exception constant err-nolib
: library ( "name" "file" -- ) \ gforth
\G Dynamically links the library specified by @i{file}. Defines a
\G word @i{name} ( -- lib ) that starts the declaration of a
\G function from that library.
create parse-name open-lib dup 0= err-nolib and throw ,
does> ( -- lib )
@ ;
|
CVS Admin Powered by ViewCVS 1.0-dev |
ViewCVS and CVS Help |