--- gforth/libffi.fs	2006/05/25 22:10:16	1.12
+++ gforth/libffi.fs	2008/09/18 02:42:24	1.30
@@ -1,12 +1,12 @@
 \ libffi.fs	shared library support package 		14aug05py
 
-\ Copyright (C) 1995,1996,1997,1998,2000,2003,2005 Free Software Foundation, Inc.
+\ Copyright (C) 1995,1996,1997,1998,2000,2003,2005,2006,2007,2008 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
+\ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.
 
 \ This program is distributed in the hope that it will be useful,
@@ -15,8 +15,148 @@
 \ 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.
+\ along with this program. If not, see http://www.gnu.org/licenses/.
+
+\ replacements for former primitives
+\ note that the API functions have their arguments reversed and other
+\ deviations.
+
+c-library libffi
+s" ffi" add-lib
+
+\ The ffi.h of XCode needs the following line, and it should not hurt elsewhere
+\c #define MACOSX
+include-ffi.h-string save-c-prefix-line \ #include <ffi.h>
+\c #include <stdio.h>
+\c static void **gforth_clist;
+\c static void *gforth_ritem;
+\c #ifndef HAS_BACKLINK
+\c static void **saved_gforth_pointers;
+\c #endif
+\c typedef void *Label;
+\c typedef Label *Xt;
+\c static void gforth_callback_ffi(ffi_cif * cif, void * resp, void ** args, void * ip)
+\c {
+\c #ifndef HAS_BACKLINK
+\c   void **gforth_pointers = saved_gforth_pointers;
+\c #endif
+\c   {
+\c     Cell *rp1 = gforth_RP;
+\c     Cell *sp = gforth_SP;
+\c     Float *fp = gforth_FP;
+\c     unsigned char *lp = gforth_LP;
+\c     void ** clist = gforth_clist;
+\c     void * ritem = gforth_ritem;
+\c
+\c     gforth_clist = args;
+\c     gforth_ritem = resp;
+\c
+\c     gforth_engine((Xt *)ip, sp, rp1, fp, lp, gforth_UP);
+\c 
+\c     /* restore global variables */
+\c     gforth_RP = rp1;
+\c     gforth_SP = sp;
+\c     gforth_FP = fp;
+\c     gforth_LP = lp;
+\c     gforth_clist = clist;
+\c     gforth_ritem = ritem;
+\c   }
+\c }
+
+\c static void* ffi_types[] =
+\c     { &ffi_type_void,
+\c       &ffi_type_uint8, &ffi_type_sint8,
+\c       &ffi_type_uint16, &ffi_type_sint16,
+\c       &ffi_type_uint32, &ffi_type_sint32,
+\c       &ffi_type_uint64, &ffi_type_sint64,
+\c       &ffi_type_float, &ffi_type_double, &ffi_type_longdouble,
+\c       &ffi_type_pointer };
+\c #define ffi_type(n) (ffi_types[n])
+c-function ffi-type ffi_type n -- a
+
+\c static int ffi_sizes[] = { sizeof(ffi_cif), sizeof(ffi_closure) };
+\c #define ffi_size(n1) (ffi_sizes[n1])
+c-function ffi-size ffi_size n -- n
+
+\c #define ffi_prep_cif1(atypes, n, rtype, cif) \
+\c           ffi_prep_cif((ffi_cif *)cif, FFI_DEFAULT_ABI, n, \
+\c                        (ffi_type *)rtype, (ffi_type **)atypes)
+c-function ffi-prep-cif ffi_prep_cif1 a n a a -- n
+
+\c #ifdef HAS_BACKLINK
+\c #define ffi_call1(a_avalues, a_rvalue ,a_ip ,a_cif) \
+\c             ffi_call((ffi_cif *)a_cif, (void(*)())a_ip, \
+\c                      (void *)a_rvalue, (void **)a_avalues)
+\c #else
+\c #define ffi_call1(a_avalues, a_rvalue ,a_ip ,a_cif) \
+\c             (saved_gforth_pointers = gforth_pointers), \
+\c             ffi_call((ffi_cif *)a_cif, (void(*)())a_ip, \
+\c                      (void *)a_rvalue, (void **)a_avalues)
+\c #endif
+c-function ffi-call ffi_call1 a a a a -- void
+
+\c #define ffi_prep_closure1(a_ip, a_cif, a_closure) \
+\c              ffi_prep_closure((ffi_closure *)a_closure, (ffi_cif *)a_cif, gforth_callback_ffi, (void *)a_ip)
+c-function ffi-prep-closure ffi_prep_closure1 a a a -- n
+
+\ !! use ud?
+\c #define ffi_2fetch(a_addr) (*(long long *)a_addr)
+c-function ffi-2@ ffi_2fetch a -- d
+
+\c #define ffi_2store(d,a_addr) ((*(long long *)a_addr) = (long long)d)
+c-function ffi-2! ffi_2store d a -- void
+
+\c #define ffi_arg_int() (*(int *)(*gforth_clist++))
+c-function ffi-arg-int ffi_arg_int -- n
+
+\c #define ffi_arg_long() (*(long *)(*gforth_clist++))
+c-function ffi-arg-long ffi_arg_long -- n
+
+\c #define ffi_arg_longlong() (*(long long *)(*gforth_clist++))
+c-function ffi-arg-longlong ffi_arg_longlong -- d
+
+\ !! correct?  The primitive is different, but looks funny
+c-function ffi-arg-dlong ffi_arg_long -- d
+
+\c #define ffi_arg_ptr() (*(char **)(*gforth_clist++))
+c-function ffi-arg-ptr ffi_arg_ptr -- a
+
+\c #define ffi_arg_float() (*(float *)(*gforth_clist++))
+c-function ffi-arg-float ffi_arg_float -- r
+
+\c #define ffi_arg_double() (*(double *)(*gforth_clist++))
+c-function ffi-arg-double ffi_arg_double -- r
+
+: ffi-ret-void ( -- )
+    0 (bye) ;
+
+\c #define ffi_ret_int1(w) (*(int*)(gforth_ritem) = w)
+c-function ffi-ret-int1 ffi_ret_int1 n -- void
+: ffi-ret-int ( w -- ) ffi-ret-int1 ffi-ret-void ;
+
+\c #define ffi_ret_longlong1(d) (*(long long *)(gforth_ritem) = d)
+c-function ffi-ret-longlong1 ffi_ret_longlong1 d -- void
+: ffi-ret-longlong ( d -- ) ffi-ret-longlong1 ffi-ret-void ;
+
+\c #define ffi_ret_dlong1(d) (*(long *)(gforth_ritem) = d)
+c-function ffi-ret-dlong1 ffi_ret_dlong1 d -- void
+: ffi-ret-dlong ( d -- ) ffi-ret-dlong1 ffi-ret-void ;
+
+c-function ffi-ret-long1 ffi_ret_dlong1 n -- void
+: ffi-ret-long ( n -- ) ffi-ret-long1 ffi-ret-void ;
+
+\c #define ffi_ret_ptr1(w) (*(char **)(gforth_ritem) = w)
+c-function ffi-ret-ptr1 ffi_ret_ptr1 a -- void
+: ffi-ret-ptr ( a -- ) ffi-ret-ptr1 ffi-ret-void ;
+
+\c #define ffi_ret_float1(r) (*(float *)(gforth_ritem) = r)
+c-function ffi-ret-float1 ffi_ret_float1 r -- void
+: ffi-ret-float ( r -- ) ffi-ret-float1 ffi-ret-void ;
+
+\c #define ffi_ret_double1(r) (*(double *)(gforth_ritem) = r)
+c-function ffi-ret-double1 ffi_ret_double1 r -- void
+: ffi-ret-double ( r -- ) ffi-ret-double1 ffi-ret-void ;
+end-c-library
 
 \ common stuff, same as fflib.fs
 
@@ -210,6 +350,7 @@ also c-decl definitions
 ' >dl+ ' >dl-   6 argtype dlong
 ' >sf+ ' >sf-   9 argtype sf
 ' >df+ ' >df- &10 argtype df
+: ints 0 ?DO int LOOP ;
 
 ' noop   0 rettype (void)
 ' is>x   6 rettype (int)
@@ -264,9 +405,12 @@ Variable rtype
     swap postpone Literal postpone call , postpone EXIT
     r@ cell+ cell+ alloc-callback r> ! ;
 
+\ !! is the stack effect right?  or is it ( 0 ret arg1 .. argn -- ) ?
 : callback; ( 0 arg1 .. argn -- )
     BEGIN  over  WHILE  compile,  REPEAT
     postpone r> postpone execute compile, drop
+    \ !! should we put ]] 0 (bye) [[ here?
+    \ !! is the EXIT ever executed?
     postpone EXIT postpone [ previous ; immediate
 
 : rettype' ( xt n -- )
@@ -294,6 +438,7 @@ also cb-decl definitions
 ' ffi-arg-longlong   8 argtype' llong
 ' ffi-arg-dlong      6 argtype' dlong
 ' ffi-arg-ptr      &12 argtype' ptr
+: ints ( n -- ) 0 ?DO postpone int LOOP ; immediate
 
 ' ffi-ret-void       0 rettype' (void)
 ' ffi-ret-int        6 rettype' (int)