1: \ libffi.fs shared library support package 14aug05py
2:
3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation, either version 3
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program. If not, see http://www.gnu.org/licenses/.
19:
20: \ replacements for former primitives
21: \ note that the API functions have their arguments reversed and other
22: \ deviations.
23:
24: c-library libffi
25: s" ffi" add-lib
26:
27: \ The ffi.h of XCode needs the following line, and it should not hurt elsewhere
28: \c #define MACOSX
29: include-ffi.h-string save-c-prefix-line \ #include <ffi.h>
30: \c #include <stdio.h>
31: \c static void **gforth_clist;
32: \c static void *gforth_ritem;
33: \c #ifndef HAS_BACKLINK
34: \c static void *(*saved_gforth_pointers)(Cell);
35: \c #endif
36: \c typedef void *Label;
37: \c typedef Label *Xt;
38: \c static void gforth_callback_ffi(ffi_cif * cif, void * resp, void ** args, void * ip)
39: \c {
40: \c #ifndef HAS_BACKLINK
41: \c void *(*gforth_pointers)(Cell) = saved_gforth_pointers;
42: \c #endif
43: \c {
44: \c Cell *rp1 = gforth_RP;
45: \c Cell *sp = gforth_SP;
46: \c Float *fp = gforth_FP;
47: \c unsigned char *lp = gforth_LP;
48: \c void ** clist = gforth_clist;
49: \c void * ritem = gforth_ritem;
50: \c
51: \c gforth_clist = args;
52: \c gforth_ritem = resp;
53: \c
54: \c gforth_engine((Xt *)ip, sp, rp1, fp, lp);
55: \c
56: \c /* restore global variables */
57: \c gforth_RP = rp1;
58: \c gforth_SP = sp;
59: \c gforth_FP = fp;
60: \c gforth_LP = lp;
61: \c gforth_clist = clist;
62: \c gforth_ritem = ritem;
63: \c }
64: \c }
65:
66: \c static void* ffi_types[] =
67: \c { &ffi_type_void,
68: \c &ffi_type_uint8, &ffi_type_sint8,
69: \c &ffi_type_uint16, &ffi_type_sint16,
70: \c &ffi_type_uint32, &ffi_type_sint32,
71: \c &ffi_type_uint64, &ffi_type_sint64,
72: \c &ffi_type_float, &ffi_type_double, &ffi_type_longdouble,
73: \c &ffi_type_pointer };
74: \c #define ffi_type(n) (ffi_types[n])
75: c-function ffi-type ffi_type n -- a
76:
77: \c static int ffi_sizes[] = { sizeof(ffi_cif), sizeof(ffi_closure) };
78: \c #define ffi_size(n1) (ffi_sizes[n1])
79: c-function ffi-size ffi_size n -- n
80:
81: \c #define ffi_prep_cif1(atypes, n, rtype, cif) \
82: \c ffi_prep_cif((ffi_cif *)cif, FFI_DEFAULT_ABI, n, \
83: \c (ffi_type *)rtype, (ffi_type **)atypes)
84: c-function ffi-prep-cif ffi_prep_cif1 a n a a -- n
85:
86: \c #ifdef HAS_BACKLINK
87: \c #define ffi_call1(a_avalues, a_rvalue ,a_ip ,a_cif) \
88: \c ffi_call((ffi_cif *)a_cif, (void(*)())a_ip, \
89: \c (void *)a_rvalue, (void **)a_avalues)
90: \c #else
91: \c #define ffi_call1(a_avalues, a_rvalue ,a_ip ,a_cif) \
92: \c (saved_gforth_pointers = gforth_pointers), \
93: \c ffi_call((ffi_cif *)a_cif, (void(*)())a_ip, \
94: \c (void *)a_rvalue, (void **)a_avalues)
95: \c #endif
96: c-function ffi-call ffi_call1 a a a a -- void
97:
98: \c #define ffi_prep_closure1(a_ip, a_cif, a_closure) \
99: \c ffi_prep_closure((ffi_closure *)a_closure, (ffi_cif *)a_cif, gforth_callback_ffi, (void *)a_ip)
100: c-function ffi-prep-closure ffi_prep_closure1 a a a -- n
101:
102: \ !! use ud?
103: \c #define ffi_2fetch(a_addr) (*(long long *)a_addr)
104: c-function ffi-2@ ffi_2fetch a -- d
105:
106: \c #define ffi_2store(d,a_addr) ((*(long long *)a_addr) = (long long)d)
107: c-function ffi-2! ffi_2store d a -- void
108:
109: \c #define ffi_arg_int() (*(int *)(*gforth_clist++))
110: c-function ffi-arg-int ffi_arg_int -- n
111:
112: \c #define ffi_arg_long() (*(long *)(*gforth_clist++))
113: c-function ffi-arg-long ffi_arg_long -- n
114:
115: \c #define ffi_arg_longlong() (*(long long *)(*gforth_clist++))
116: c-function ffi-arg-longlong ffi_arg_longlong -- d
117:
118: \ !! correct? The primitive is different, but looks funny
119: c-function ffi-arg-dlong ffi_arg_long -- d
120:
121: \c #define ffi_arg_ptr() (*(char **)(*gforth_clist++))
122: c-function ffi-arg-ptr ffi_arg_ptr -- a
123:
124: \c #define ffi_arg_float() (*(float *)(*gforth_clist++))
125: c-function ffi-arg-float ffi_arg_float -- r
126:
127: \c #define ffi_arg_double() (*(double *)(*gforth_clist++))
128: c-function ffi-arg-double ffi_arg_double -- r
129:
130: : ffi-ret-void ( -- )
131: 0 (bye) ;
132:
133: \c #define ffi_ret_int1(w) (*(int*)(gforth_ritem) = w)
134: c-function ffi-ret-int1 ffi_ret_int1 n -- void
135: : ffi-ret-int ( w -- ) ffi-ret-int1 ffi-ret-void ;
136:
137: \c #define ffi_ret_longlong1(d) (*(long long *)(gforth_ritem) = d)
138: c-function ffi-ret-longlong1 ffi_ret_longlong1 d -- void
139: : ffi-ret-longlong ( d -- ) ffi-ret-longlong1 ffi-ret-void ;
140:
141: \c #define ffi_ret_dlong1(d) (*(long *)(gforth_ritem) = d)
142: c-function ffi-ret-dlong1 ffi_ret_dlong1 d -- void
143: : ffi-ret-dlong ( d -- ) ffi-ret-dlong1 ffi-ret-void ;
144:
145: c-function ffi-ret-long1 ffi_ret_dlong1 n -- void
146: : ffi-ret-long ( n -- ) ffi-ret-long1 ffi-ret-void ;
147:
148: \c #define ffi_ret_ptr1(w) (*(char **)(gforth_ritem) = w)
149: c-function ffi-ret-ptr1 ffi_ret_ptr1 a -- void
150: : ffi-ret-ptr ( a -- ) ffi-ret-ptr1 ffi-ret-void ;
151:
152: \c #define ffi_ret_float1(r) (*(float *)(gforth_ritem) = r)
153: c-function ffi-ret-float1 ffi_ret_float1 r -- void
154: : ffi-ret-float ( r -- ) ffi-ret-float1 ffi-ret-void ;
155:
156: \c #define ffi_ret_double1(r) (*(double *)(gforth_ritem) = r)
157: c-function ffi-ret-double1 ffi_ret_double1 r -- void
158: : ffi-ret-double ( r -- ) ffi-ret-double1 ffi-ret-void ;
159: end-c-library
160:
161: \ common stuff, same as fflib.fs
162:
163: Variable libs 0 libs !
164: \ links between libraries
165: Variable thisproc
166: Variable thislib
167:
168: Variable revdec revdec off
169: \ turn revdec on to compile bigFORTH libraries
170: Variable revarg revarg off
171: \ turn revarg on to compile declarations with reverse arguments
172: Variable legacy legacy off
173: \ turn legacy on to compile bigFORTH legacy libraries
174:
175: Vocabulary c-decl
176: Vocabulary cb-decl
177:
178: : @lib ( lib -- )
179: \G obtains library handle
180: cell+ dup 2 cells + count open-lib
181: dup 0= abort" Library not found" swap ! ;
182:
183: : @proc ( lib addr -- )
184: \G obtains symbol address
185: cell+ tuck cell+ @ count rot cell+ @
186: lib-sym dup 0= abort" Proc not found!" swap ! ;
187:
188: : proc, ( lib -- )
189: \G allocates and initializes proc stub
190: \G stub format:
191: \G linked list in library
192: \G address of proc
193: \G ptr to OS name of symbol as counted string
194: \G threaded code for invocation
195: here dup thisproc !
196: swap 2 cells + dup @ A, !
197: 0 , 0 A, ;
198:
199: Defer legacy-proc ' noop IS legacy-proc
200:
201: : proc: ( lib "name" -- )
202: \G Creates a named proc stub
203: Create proc, 0 also c-decl
204: legacy @ IF legacy-proc THEN
205: DOES> ( x1 .. xn -- r )
206: 3 cells + >r ;
207:
208: : library ( "name" "file" -- )
209: \G loads library "file" and creates a proc defining word "name"
210: \G library format:
211: \G linked list of libraries
212: \G library handle
213: \G linked list of library's procs
214: \G OS name of library as counted string
215: Create here libs @ A, dup libs !
216: 0 , 0 A, parse-name string, @lib
217: DOES> ( -- ) dup thislib ! proc: ;
218:
219: : init-shared-libs ( -- )
220: defers 'cold libs
221: 0 libs BEGIN @ dup WHILE dup REPEAT drop
222: BEGIN dup WHILE >r
223: r@ @lib
224: r@ 2 cells + BEGIN @ dup WHILE r@ over @proc REPEAT
225: drop rdrop
226: REPEAT drop ;
227:
228: ' init-shared-libs IS 'cold
229:
230: : symbol, ( "c-symbol" -- )
231: here thisproc @ 2 cells + ! parse-name s,
232: thislib @ thisproc @ @proc ;
233:
234: : func@ >body cell+ @ ;
235: : func' ' func@ ;
236: : [func'] postpone ['] postpone func@ ; immediate restrict
237:
238: \ stuff for libffi
239:
240: \ libffi uses a parameter array for the input
241:
242: $20 Value maxargs
243:
244: Create retbuf 2 cells allot
245: Create argbuf maxargs 2* cells allot
246: Create argptr maxargs 0 [DO] argbuf [I] 2* cells + A, [LOOP]
247:
248: \ "forward" when revarg is on
249:
250: \ : >c+ ( char buf -- buf' ) tuck c! cell+ cell+ ;
251: : >i+ ( n buf -- buf' ) tuck l! cell+ cell+ ;
252: : >p+ ( addr buf -- buf' ) tuck ! cell+ cell+ ;
253: : >d+ ( d buf -- buf' ) dup >r ffi-2! r> cell+ cell+ ;
254: : >dl+ ( d buf -- buf' ) nip dup >r ! r> cell+ cell+ ;
255: : >sf+ ( r buf -- buf' ) dup sf! cell+ cell+ ;
256: : >df+ ( r buf -- buf' ) dup df! cell+ cell+ ;
257:
258: \ "backward" when revarg is off
259:
260: : >i- ( n buf -- buf' ) 2 cells - tuck l! ;
261: : >p- ( addr buf -- buf' ) 2 cells - tuck ! ;
262: : >d- ( d buf -- buf' ) 2 cells - dup >r ffi-2! r> ;
263: : >dl- ( d buf -- buf' ) 2 cells - nip dup >r ! r> ;
264: : >sf- ( r buf -- buf' ) 2 cells - dup sf! ;
265: : >df- ( r buf -- buf' ) 2 cells - dup df! ;
266:
267: \ return value
268:
269: : i>x ( -- n ) retbuf l@ ;
270: : is>x ( -- n ) retbuf sl@ ;
271: : p>x ( -- addr ) retbuf @ ;
272: : dl>x ( -- d ) retbuf @ s>d ;
273: : d>x ( -- d ) retbuf ffi-2@ ;
274: : sf>x ( -- r ) retbuf sf@ ;
275: : df>x ( -- r ) retbuf df@ ;
276:
277: table constant cifs
278:
279: Variable cifbuf $40 allot \ maximum: 64 parameters
280: : cifreset cifbuf cell+ cifbuf ! ;
281: cifreset
282: Variable args args off
283:
284: : argtype ( bkxt fwxt type "name" -- )
285: Create , , , DOES> 1 args +! ;
286:
287: : arg@ ( arg -- type pushxt )
288: dup @ swap cell+
289: revarg @ IF cell+ THEN @ ;
290:
291: : arg, ( xt -- )
292: dup ['] noop = IF drop EXIT THEN compile, ;
293:
294: : start, ( n -- ) cifbuf cell+ cifbuf !
295: revarg @ IF drop 0 ELSE 2* cells THEN argbuf +
296: postpone Literal ;
297:
298: Variable ind-call ind-call off
299: : fptr ind-call on Create here thisproc !
300: 0 , 0 , 0 , 0 also c-decl DOES> cell+ dup cell+ cell+ >r ! ;
301:
302: : ffi-call, ( -- lit-cif )
303: postpone drop postpone argptr postpone retbuf
304: thisproc @ cell+ postpone literal postpone @
305: 0 postpone literal here cell -
306: postpone ffi-call ;
307:
308: : cif, ( n -- )
309: cifbuf @ c! 1 cifbuf +! ;
310:
311: : cif@ ( -- addr u )
312: cifbuf cell+ cifbuf @ over - ;
313:
314: : create-cif ( rtype -- addr ) cif,
315: cif@ cifs search-wordlist
316: IF execute EXIT THEN
317: get-current >r cifs set-current
318: cif@ nextname Create here >r
319: cif@ 1- bounds ?DO I c@ ffi-type , LOOP r>
320: r> set-current ;
321:
322: : make-cif ( rtype -- addr ) create-cif
323: cif@ 1- tuck + c@ ffi-type here 0 ffi-size allot
324: dup >r ffi-prep-cif throw r> ;
325:
326: : decl, ( 0 arg1 .. argn call rtype start -- )
327: start, { retxt rtype } cifreset
328: revdec @ IF 0 >r
329: BEGIN dup WHILE >r REPEAT
330: BEGIN r> dup WHILE arg@ arg, REPEAT
331: ffi-call, retxt compile, postpone EXIT
332: BEGIN dup WHILE cif, REPEAT drop
333: ELSE 0 >r
334: BEGIN dup WHILE arg@ arg, >r REPEAT drop
335: ffi-call, retxt compile, postpone EXIT
336: BEGIN r> dup WHILE cif, REPEAT drop
337: THEN rtype make-cif swap ! here thisproc @ 2 cells + ! ;
338:
339: : rettype ( endxt n "name" -- )
340: Create 2,
341: DOES> 2@ args @ decl, ind-call @ 0= IF symbol, THEN
342: previous revarg off args off ind-call off ;
343:
344: 6 1 cells 4 > 2* - Constant _long
345:
346: also c-decl definitions
347:
348: : <rev> revarg on ;
349:
350: ' >i+ ' >i- 6 argtype int
351: ' >p+ ' >p- _long argtype long
352: ' >p+ ' >p- &12 argtype ptr
353: ' >d+ ' >d- 8 argtype llong
354: ' >dl+ ' >dl- 6 argtype dlong
355: ' >sf+ ' >sf- 9 argtype sf
356: ' >df+ ' >df- &10 argtype df
357: : ints 0 ?DO int LOOP ;
358:
359: ' noop 0 rettype (void)
360: ' is>x 6 rettype (int)
361: ' i>x 5 rettype (uint)
362: ' p>x _long rettype (long)
363: ' p>x &12 rettype (ptr)
364: ' d>x 8 rettype (llong)
365: ' dl>x 6 rettype (dlong)
366: ' sf>x 9 rettype (sf)
367: ' df>x &10 rettype (fp)
368:
369: : (addr) thisproc @ cell+ postpone Literal postpone @ postpone EXIT
370: drop symbol, previous revarg off args off ;
371:
372: previous definitions
373:
374: \ legacy support for old library interfaces
375: \ interface to old vararg stuff not implemented yet
376:
377: also c-decl
378:
379: :noname ( n 0 -- 0 int1 .. intn )
380: legacy @ 0< revarg !
381: swap 0 ?DO int LOOP (int)
382: ; IS legacy-proc
383:
384: : (int) ( n -- )
385: >r ' execute r> 0 ?DO int LOOP (int) ;
386: : (void) ( n -- )
387: >r ' execute r> 0 ?DO int LOOP (void) ;
388: : (float) ( n -- )
389: >r ' execute r> 0 ?DO df LOOP (fp) ;
390:
391: previous
392:
393: \ callback stuff
394:
395: Variable callbacks
396: \G link between callbacks
397:
398: Variable rtype
399:
400: : alloc-callback ( ip -- addr )
401: rtype @ make-cif here 1 ffi-size allot
402: dup >r ffi-prep-closure throw r> ;
403:
404: : callback ( -- )
405: Create 0 ] postpone >r also cb-decl cifreset
406: DOES>
407: 0 Value -1 cells allot
408: here >r 0 , callbacks @ A, r@ callbacks !
409: swap postpone Literal postpone call , postpone EXIT
410: r@ cell+ cell+ alloc-callback r> ! ;
411:
412: \ !! is the stack effect right? or is it ( 0 ret arg1 .. argn -- ) ?
413: : callback; ( 0 arg1 .. argn -- )
414: BEGIN over WHILE compile, REPEAT
415: postpone r> postpone execute compile, drop
416: \ !! should we put ]] 0 (bye) [[ here?
417: \ !! is the EXIT ever executed?
418: postpone EXIT postpone [ previous ; immediate
419:
420: : rettype' ( xt n -- )
421: Create , A, immediate
422: DOES> 2@ rtype ! ;
423: : argtype' ( xt n -- )
424: Create , A, immediate
425: DOES> 2@ cif, ;
426:
427: : init-callbacks ( -- )
428: defers 'cold callbacks cell -
429: BEGIN cell+ @ dup WHILE dup cell+ cell+ alloc-callback over !
430: REPEAT drop ;
431:
432: ' init-callbacks IS 'cold
433:
434: also cb-decl definitions
435:
436: \ arguments
437:
438: ' ffi-arg-int 6 argtype' int
439: ' ffi-arg-float 9 argtype' sf
440: ' ffi-arg-double &10 argtype' df
441: ' ffi-arg-long _long argtype' long
442: ' ffi-arg-longlong 8 argtype' llong
443: ' ffi-arg-dlong 6 argtype' dlong
444: ' ffi-arg-ptr &12 argtype' ptr
445: : ints ( n -- ) 0 ?DO postpone int LOOP ; immediate
446:
447: ' ffi-ret-void 0 rettype' (void)
448: ' ffi-ret-int 6 rettype' (int)
449: ' ffi-ret-float 9 rettype' (sf)
450: ' ffi-ret-double &10 rettype' (fp)
451: ' ffi-ret-longlong 8 rettype' (llong)
452: ' ffi-ret-long _long rettype' (long)
453: ' ffi-ret-dlong _long rettype' (dlong)
454: ' ffi-ret-ptr &12 rettype' (ptr)
455:
456: previous definitions
457:
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