Annotation of gforth/libffi.fs, revision 1.3
1.1 pazsan 1: \ libffi.fs shared library support package 14aug05py
2:
3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2005 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 2
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, write to the Free Software
19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20:
21: \ common stuff, same as fflib.fs
22:
23: Variable libs 0 libs !
24: \ links between libraries
25: Variable thisproc
26: Variable thislib
27:
28: Variable revdec revdec off
29: \ turn revdec on to compile bigFORTH libraries
30: Variable revarg revarg off
31: \ turn revarg on to compile declarations with reverse arguments
32: Variable legacy legacy off
33: \ turn legacy on to compile bigFORTH legacy libraries
34:
35: Vocabulary c-decl
36: Vocabulary cb-decl
37:
38: : @lib ( lib -- )
39: \G obtains library handle
40: cell+ dup 2 cells + count open-lib
41: dup 0= abort" Library not found" swap ! ;
42:
43: : @proc ( lib addr -- )
44: \G obtains symbol address
45: cell+ tuck cell+ @ count rot cell+ @
46: lib-sym dup 0= abort" Proc not found!" swap ! ;
47:
48: : proc, ( lib -- )
49: \G allocates and initializes proc stub
50: \G stub format:
51: \G linked list in library
52: \G address of proc
53: \G ptr to OS name of symbol as counted string
54: \G threaded code for invocation
55: here dup thisproc !
56: swap 2 cells + dup @ A, !
57: 0 , 0 A, ;
58:
59: Defer legacy-proc ' noop IS legacy-proc
60:
61: : proc: ( lib "name" -- )
62: \G Creates a named proc stub
63: Create proc, 0 also c-decl
64: legacy @ IF legacy-proc THEN
65: DOES> ( x1 .. xn -- r )
66: 3 cells + >r ;
67:
68: : library ( "name" "file" -- )
69: \G loads library "file" and creates a proc defining word "name"
70: \G library format:
71: \G linked list of libraries
72: \G library handle
73: \G linked list of library's procs
74: \G OS name of library as counted string
75: Create here libs @ A, dup libs !
76: 0 , 0 A, parse-name string, @lib
77: DOES> ( -- ) dup thislib ! proc: ;
78:
79: : init-shared-libs ( -- )
80: defers 'cold libs
81: 0 libs BEGIN @ dup WHILE dup REPEAT drop
82: BEGIN dup WHILE >r
83: r@ @lib
84: r@ 2 cells + BEGIN @ dup WHILE r@ over @proc REPEAT
85: drop rdrop
86: REPEAT drop ;
87:
88: ' init-shared-libs IS 'cold
89:
90: : symbol, ( "c-symbol" -- )
91: here thisproc @ 2 cells + ! parse-name s,
92: thislib @ thisproc @ @proc ;
93:
94: \ stuff for libffi
95:
96: \ libffi uses a parameter array for the input
97:
98: $20 Value maxargs
99:
100: Create retbuf 2 cells allot
101: Create argbuf maxargs 2* cells allot
102: Create argptr maxargs 0 [DO] argbuf [I] 2* cells + A, [LOOP]
103:
104: \ "forward" when revarg is on
105:
106: \ : >c+ ( char buf -- buf' ) tuck c! cell+ cell+ ;
107: : >i+ ( n buf -- buf' ) tuck ! cell+ cell+ ;
108: : >p+ ( addr buf -- buf' ) tuck ! cell+ cell+ ;
109: : >d+ ( d buf -- buf' ) dup >r ffi-2! r> cell+ cell+ ;
110: : >sf+ ( r buf -- buf' ) dup sf! cell+ cell+ ;
111: : >df+ ( r buf -- buf' ) dup df! cell+ cell+ ;
112:
113: \ "backward" when revarg is off
114:
1.2 pazsan 115: : >i- ( n buf -- buf' ) 2 cells - tuck ffi-i! ;
1.1 pazsan 116: : >p- ( addr buf -- buf' ) 2 cells - tuck ! ;
117: : >d- ( d buf -- buf' ) 2 cells - dup >r ffi-2! r> ;
118: : >sf- ( r buf -- buf' ) 2 cells - dup sf! ;
119: : >df- ( r buf -- buf' ) 2 cells - dup df! ;
120:
121: \ return value
122:
1.2 pazsan 123: : i>x ( -- n ) retbuf ffi-i@ ;
1.1 pazsan 124: : p>x ( -- addr ) retbuf @ ;
125: : d>x ( -- d ) retbuf ffi-2@ ;
126: : sf>x ( -- r ) retbuf sf@ ;
127: : df>x ( -- r ) retbuf df@ ;
128:
129: wordlist constant cifs
130:
131: Variable cifbuf $40 allot \ maximum: 64 parameters
1.2 pazsan 132: : cifreset cifbuf cell+ cifbuf ! ;
133: cifreset
1.1 pazsan 134: Variable args args off
135:
136: : argtype ( bkxt fwxt type "name" -- )
137: Create , , , DOES> 1 args +! ;
138:
139: : arg@ ( arg -- type pushxt )
140: dup @ swap cell+
141: revarg @ IF cell+ THEN @ ;
142:
143: : arg, ( xt -- )
144: dup ['] noop = IF drop EXIT THEN compile, ;
145:
146: : start, ( n -- ) cifbuf cell+ cifbuf !
147: revarg @ IF drop 0 ELSE 2* cells THEN argbuf +
148: postpone Literal ;
149:
150: : ffi-call, ( -- lit-cif )
151: postpone drop postpone argptr postpone retbuf
152: thisproc @ cell+ postpone literal postpone @
153: 0 postpone literal here cell -
154: postpone ffi-call ;
155:
156: : cif, ( n -- )
157: cifbuf @ c! 1 cifbuf +! ;
158:
159: : cif@ ( -- addr u )
160: cifbuf cell+ cifbuf @ over - ;
161:
162: : make-cif ( rtype -- addr ) cif,
163: cif@ cifs search-wordlist
164: IF execute EXIT THEN
165: get-current >r cifs set-current
166: cif@ nextname Create here >r
167: cif@ 1- bounds ?DO I c@ ffi-type , LOOP
168: r> cif@ 1- tuck + c@ ffi-type here dup >r 0 ffi-size allot
169: ffi-prep-cif throw
170: r> r> set-current ;
171:
172: : decl, ( 0 arg1 .. argn call rtype start -- )
1.2 pazsan 173: start, { retxt rtype } cifreset
1.1 pazsan 174: revdec @ IF 0 >r
175: BEGIN dup WHILE >r REPEAT
176: BEGIN r> dup WHILE arg@ arg, REPEAT
177: ffi-call, retxt compile, postpone EXIT
178: BEGIN dup WHILE cif, REPEAT drop
179: ELSE 0 >r
180: BEGIN dup WHILE arg@ arg, >r REPEAT drop
181: ffi-call, retxt compile, postpone EXIT
182: BEGIN r> dup WHILE cif, REPEAT drop
183: THEN rtype make-cif swap ! here thisproc @ 2 cells + ! ;
184:
185: : rettype ( endxt n "name" -- )
186: Create 2,
187: DOES> 2@ args @ decl, symbol, previous revarg off args off ;
188:
189: also c-decl definitions
190:
191: : <rev> revarg on ;
192:
193: ' >i+ ' >i- 6 argtype int
194: ' >p+ ' >p- &12 argtype ptr
195: ' >d+ ' >d- 8 argtype llong
196: ' >sf+ ' >sf- 9 argtype sf
197: ' >df+ ' >df- &10 argtype df
198:
199: ' noop 0 rettype (void)
200: ' i>x 6 rettype (int)
201: ' p>x &12 rettype (ptr)
202: ' d>x 8 rettype (llong)
203: ' sf>x 9 rettype (sf)
204: ' df>x &10 rettype (fp)
205:
1.3 ! pazsan 206: : (addr) thisproc @ cell+ postpone Literal postpone @ postpone EXIT
! 207: symbol, previous revarg off args off ;
! 208:
1.1 pazsan 209: previous definitions
210:
211: \ legacy support for old library interfaces
212: \ interface to old vararg stuff not implemented yet
213:
214: also c-decl
215:
216: :noname ( n 0 -- 0 int1 .. intn )
217: legacy @ 0< revarg !
218: swap 0 ?DO int LOOP (int)
219: ; IS legacy-proc
220:
221: : (int) ( n -- )
222: >r ' execute r> 0 ?DO int LOOP (int) ;
223: : (void) ( n -- )
224: >r ' execute r> 0 ?DO int LOOP (void) ;
225: : (float) ( n -- )
226: >r ' execute r> 0 ?DO df LOOP (fp) ;
227:
228: previous
229:
230: \ callback stuff
231:
232: Variable callbacks
233: \G link between callbacks
234:
1.2 pazsan 235: Variable rtype
236:
237: : alloc-callback ( -- addr )
238: rtype @ cif,
239: here >r
240: cif@ 1- bounds ?DO I c@ ffi-type , LOOP
241: r> cif@ 1- tuck + c@ ffi-type here dup >r 1 ffi-size allot
242: ffi-prep-closure throw r> ;
243:
1.1 pazsan 244: : callback ( -- )
1.2 pazsan 245: Create 0 ] postpone >r also cb-decl cifreset
1.1 pazsan 246: DOES>
247: Create here >r 0 , callbacks @ A, r@ callbacks !
248: swap postpone Literal postpone call , postpone EXIT
249: r> dup cell+ cell+ alloc-callback swap !
250: DOES> @ ;
251:
1.2 pazsan 252: : callback; ( 0 arg1 .. argn -- )
1.1 pazsan 253: BEGIN over WHILE compile, REPEAT
254: postpone r> postpone execute compile, drop
255: postpone EXIT postpone [ previous ; immediate
256:
1.2 pazsan 257: : rettype' ( xt n -- )
258: Create , A, immediate
259: DOES> 2@ rtype ! ;
260: : argtype' ( xt n -- )
261: Create , A, immediate
262: DOES> 2@ cif, ;
1.1 pazsan 263:
264: : init-callbacks ( -- )
265: defers 'cold callbacks cell -
266: BEGIN cell+ @ dup WHILE dup cell+ cell+ alloc-callback over !
267: REPEAT drop ;
268:
269: ' init-callbacks IS 'cold
270:
271: also cb-decl definitions
272:
273: \ arguments
274:
1.2 pazsan 275: ' ffi-arg-int 6 argtype' int
276: ' ffi-arg-float 9 argtype' sf
277: ' ffi-arg-double &10 argtype' df
278: ' ffi-arg-longlong 8 argtype' llong
279: ' ffi-arg-ptr &12 argtype' ptr
280:
281: ' ffi-ret-void 0 rettype' (void)
282: ' ffi-ret-int 6 rettype' (int)
283: ' ffi-ret-float 9 rettype' (sf)
284: ' ffi-ret-double &10 rettype' (fp)
285: ' ffi-ret-longlong 8 rettype' (llong)
286: ' ffi-ret-ptr &12 rettype' (ptr)
1.1 pazsan 287:
288: previous definitions
289:
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