1: \ libcc.fs foreign function interface implemented using a C compiler
2:
3: \ Copyright (C) 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:
21: \ What this implementation does is this: if it sees a declaration like
22:
23: \ \ something that tells it that the current library is libc
24: \ \c #include <unistd.h>
25: \ c-function dlseek lseek n d n -- d
26:
27: \ it genererates C code similar to the following:
28:
29: \ #include <gforth.h>
30: \ #include <unistd.h>
31: \
32: \ void gforth_c_lseek_ndn_d(void)
33: \ {
34: \ Cell *sp = gforth_SP;
35: \ Float *fp = gforth_FP;
36: \ long long result; /* longest type in C */
37: \ gforth_ll2d(lseek(sp[3],gforth_d2ll(sp[2],sp[1]),sp[0]),sp[3],sp[2]);
38: \ gforth_SP = sp+2;
39: \ }
40:
41: \ Then it compiles this code and dynamically links it into the Gforth
42: \ system (batching and caching are future work). It also dynamically
43: \ links lseek. Performing DLSEEK then puts the function pointer of
44: \ the function pointer of gforth_c_lseek_ndn_d on the stack and
45: \ calls CALL-C.
46:
47: \ ToDo:
48:
49: \ Batching, caching and lazy evaluation:
50:
51: \ Batching:
52:
53: \ New words are deferred, and the corresponding C functions are
54: \ collected in one file, until the first word is EXECUTEd; then the
55: \ file is compiled and linked into the system, and the word is
56: \ resolved.
57:
58: \ Caching:
59:
60: \ Instead of compiling all this stuff anew for every execution, we
61: \ keep the files around and have an index file containing the function
62: \ names and their corresponding .so files. If the needed wrapper name
63: \ is already present, it is just linked instead of generating the
64: \ wrapper again. This is all done by loading the index file(s?),
65: \ which define words for the wrappers in a separate wordlist.
66:
67: \ The files are built in .../lib/gforth/$VERSION/libcc/ or
68: \ ~/.gforth/libcc/$HOST/.
69:
70: \ Todo: conversion between function pointers and xts (both directions)
71:
72: \ taking an xt and turning it into a function pointer:
73:
74: \ e.g., assume we have the xt of + and want to create a C function int
75: \ gforth_callback_plus(int, int), and then pass the pointer to that
76: \ function:
77:
78: \ There should be Forth code like this:
79: \ ] + 0 (bye)
80: \ Assume that the start of this code is START
81:
82: \ Now, there should be a C function:
83:
84: \ int gforth_callback_plus(int p1, int p2)
85: \ {
86: \ Cell *sp = gforth_SP;
87: \ Float *fp = gforth_FP;
88: \ Float *fp = gforth_FP;
89: \ Address lp = gforth_LP;
90: \ sp -= 2;
91: \ sp[0] = p1;
92: \ sp[1] = p2;
93: \ gforth_engine(START, sp, rp, fp, lp);
94: \ sp += 1;
95: \ gforth_RP = rp;
96: \ gforth_SP = sp;
97: \ gforth_FP = fp;
98: \ gforth_LP = lp;
99: \ return sp[0];
100: \ }
101:
102: \ and the pointer to that function is the C function pointer for the XT of +.
103:
104: \ Future problems:
105: \ how to combine the Forth code generation with inlining
106: \ START is not a constant across executions (when caching the C files)
107: \ Solution: make START a variable, and store into it on startup with dlsym
108:
109: \ Syntax:
110: \ callback <rettype> <params> <paramtypes> -- <rettype>
111:
112:
113: \ data structures
114:
115: \ For every c-function, we have three words: two anonymous words
116: \ created by c-function-ft (first time) and c-function-rt (run-time),
117: \ and a named deferred word. The deferred word first points to the
118: \ first-time word, then to the run-time word; the run-time word calls
119: \ the c function.
120:
121: [ifundef] parse-name
122: ' parse-word alias parse-name
123: [then]
124: [ifundef] defer!
125: : defer! ( xt xt-deferred -- ) \ gforth defer-store
126: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
127: >body [ has? rom [IF] ] @ [ [THEN] ] ! ;
128: [then]
129:
130: \ : delete-file 2drop 0 ;
131:
132: require struct.fs
133: require mkdir.fs
134:
135: \ c-function-ft word body:
136: struct
137: cell% field cff-cfr \ xt of c-function-rt word
138: cell% field cff-deferred \ xt of c-function deferred word
139: cell% field cff-lha \ address of the lib-handle for the lib that
140: \ contains the wrapper function of the word
141: char% field cff-ctype \ call type (function=1, value=0)
142: char% field cff-rtype \ return type
143: char% field cff-np \ number of parameters
144: 1 0 field cff-ptypes \ #npar parameter types
145: \ counted string: c-name
146: end-struct cff%
147:
148: variable c-source-file-id \ contains the source file id of the current batch
149: 0 c-source-file-id !
150: variable lib-handle-addr \ points to the library handle of the current batch.
151: \ the library handle is 0 if the current
152: \ batch is not yet compiled.
153: here 0 , lib-handle-addr ! \ just make sure LIB-HANDLE always works
154: 2variable lib-filename \ filename without extension
155: 2variable lib-modulename \ basename of the file without extension
156: 2variable libcc-named-dir-v \ directory for named libcc wrapper libraries
157: Variable libcc-path \ pointer to path of library directories
158:
159: defer replace-rpath ( c-addr1 u1 -- c-addr2 u2 )
160: ' noop is replace-rpath
161:
162: : .nb ( n -- )
163: 0 .r ;
164:
165: : const+ ( n1 "name" -- n2 )
166: dup constant 1+ ;
167:
168: : front-string { c-addr1 u1 c-addr2 u2 -- c-addr3 u3 }
169: \ insert string c-addr2 u2 in buffer c-addr1 u1; c-addr3 u3 is the
170: \ remainder of the buffer.
171: assert( u1 u2 u>= )
172: c-addr2 c-addr1 u2 move
173: c-addr1 u1 u2 /string ;
174:
175: : front-char { c-addr1 u1 c -- c-addr3 u2 }
176: \ insert c in buffer c-addr1 u1; c-addr3 u3 is the remainder of
177: \ the buffer.
178: assert( u1 0 u> )
179: c c-addr1 c!
180: c-addr1 u1 1 /string ;
181:
182: : s+ { addr1 u1 addr2 u2 -- addr u }
183: u1 u2 + allocate throw { addr }
184: addr1 addr u1 move
185: addr2 addr u1 + u2 move
186: addr u1 u2 +
187: ;
188:
189: : append { addr1 u1 addr2 u2 -- addr u }
190: addr1 u1 u2 + dup { u } resize throw { addr }
191: addr2 addr u1 + u2 move
192: addr u ;
193:
194: \ linked list stuff (should go elsewhere)
195:
196: struct
197: cell% field list-next
198: 1 0 field list-payload
199: end-struct list%
200:
201: : list-insert { node list -- }
202: list list-next @ node list-next !
203: node list list-next ! ;
204:
205: : list-append { node endlistp -- }
206: \ insert node at place pointed to by endlistp
207: node endlistp @ list-insert
208: node list-next endlistp ! ;
209:
210: : list-map ( ... list xt -- ... )
211: \ xt ( ... node -- ... )
212: { xt } begin { node }
213: node while
214: node xt execute
215: node list-next @
216: repeat ;
217:
218: 2variable c-libs \ library names in a string (without "lib")
219:
220: : add-lib ( c-addr u -- ) \ gforth
221: \G Add library lib@i{string} to the list of libraries, where
222: \G @i{string} is represented by @i{c-addr u}.
223: c-libs 2@ d0= IF 0 allocate throw 0 c-libs 2! THEN
224: c-libs 2@ s" -l" append 2swap append c-libs 2! ;
225:
226: : add-libpath ( c-addr u -- ) \ gforth
227: \G Add path @i{string} to the list of library search pathes, where
228: \G @i{string} is represented by @i{c-addr u}.
229: c-libs 2@ d0= IF 0 allocate throw 0 c-libs 2! THEN
230: c-libs 2@ s" -L" append 2swap append c-libs 2! ;
231:
232: \ C prefix lines
233:
234: \ linked list of longcstrings: [ link | count-cell | characters ]
235:
236: list%
237: cell% field c-prefix-count
238: 1 0 field c-prefix-chars
239: end-struct c-prefix%
240:
241: variable c-prefix-lines 0 c-prefix-lines !
242: variable c-prefix-lines-end c-prefix-lines c-prefix-lines-end !
243:
244: : print-c-prefix-line ( node -- )
245: dup c-prefix-chars swap c-prefix-count @ type cr ;
246:
247: : print-c-prefix-lines ( -- )
248: c-prefix-lines @ ['] print-c-prefix-line list-map ;
249:
250: : write-c-prefix-line ( c-addr u -- )
251: c-source-file-id @ dup if
252: write-line throw
253: else
254: drop 2drop
255: then ;
256:
257: : save-c-prefix-line1 ( c-addr u -- )
258: 2dup write-c-prefix-line
259: align here 0 , c-prefix-lines-end list-append ( c-addr u )
260: longstring, ;
261:
262: defer save-c-prefix-line ( c-addr u -- )
263: ' save-c-prefix-line1 is save-c-prefix-line
264:
265: : \c ( "rest-of-line" -- ) \ gforth backslash-c
266: \G One line of C declarations for the C interface
267: -1 parse save-c-prefix-line ;
268:
269: s" #include <gforth/" version-string s+ s" /libcc.h>" append ( c-addr u )
270: 2dup save-c-prefix-line drop free throw
271:
272: \ Types (for parsing)
273:
274: wordlist constant libcc-types
275:
276: get-current libcc-types set-current
277:
278: \ index values
279: -1
280: const+ -- \ end of arguments
281: const+ n \ integer cell
282: const+ a \ address cell
283: const+ d \ double
284: const+ r \ float
285: const+ func \ C function pointer
286: const+ void
287: drop
288:
289: set-current
290:
291: \ call types
292: 0
293: const+ c-func
294: const+ c-val
295: const+ c-var
296: drop
297:
298: : libcc-type ( c-addr u -- u2 )
299: libcc-types search-wordlist 0= -13 and throw execute ;
300:
301: : parse-libcc-type ( "libcc-type" -- u ) parse-name libcc-type ;
302:
303: : parse-return-type ( "libcc-type" -- u )
304: parse-libcc-type dup 0< -32 and throw ;
305:
306: : parse-function-types ( "{libcc-type}" "--" "libcc-type" -- addr )
307: c-func c, here
308: dup 2 chars allot here begin
309: parse-libcc-type dup 0>= while
310: c,
311: repeat
312: drop here swap - over char+ c!
313: parse-return-type swap c! ;
314:
315: : parse-value-type ( "{--}" "libcc-type" -- addr )
316: c-val c, here
317: parse-libcc-type dup 0< if drop parse-return-type then
318: c, 0 c, ;
319:
320: : parse-variable-type ( -- addr )
321: c-var c, here
322: s" a" libcc-type c, 0 c, ;
323:
324: : type-letter ( n -- c )
325: chars s" nadrfv" drop + c@ ;
326:
327: \ count-stacks
328:
329: : count-stacks-n ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
330: 1+ ;
331:
332: : count-stacks-a ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
333: 1+ ;
334:
335: : count-stacks-d ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
336: 2 + ;
337:
338: : count-stacks-r ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
339: swap 1+ swap ;
340:
341: : count-stacks-func ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
342: 1+ ;
343:
344: : count-stacks-void ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
345: ;
346:
347: create count-stacks-types
348: ' count-stacks-n ,
349: ' count-stacks-a ,
350: ' count-stacks-d ,
351: ' count-stacks-r ,
352: ' count-stacks-func ,
353: ' count-stacks-void ,
354:
355: : count-stacks ( pars -- fp-change sp-change )
356: \ pars is an addr u pair
357: 0 0 2swap over + swap u+do
358: i c@ cells count-stacks-types + @ execute
359: loop ;
360:
361: \ gen-pars
362:
363: : gen-par-n ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
364: ." sp[" 1- dup .nb ." ]" ;
365:
366: : gen-par-a ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
367: ." (void *)(" gen-par-n ." )" ;
368:
369: : gen-par-d ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
370: ." gforth_d2ll(" gen-par-n ." ," gen-par-n ." )" ;
371:
372: : gen-par-r ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
373: swap 1- tuck ." fp[" .nb ." ]" ;
374:
375: : gen-par-func ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
376: gen-par-a ;
377:
378: : gen-par-void ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
379: -32 throw ;
380:
381: create gen-par-types
382: ' gen-par-n ,
383: ' gen-par-a ,
384: ' gen-par-d ,
385: ' gen-par-r ,
386: ' gen-par-func ,
387: ' gen-par-void ,
388:
389: : gen-par ( fp-depth1 sp-depth1 partype -- fp-depth2 sp-depth2 )
390: cells gen-par-types + @ execute ;
391:
392: \ the call itself
393:
394: : gen-wrapped-func { d: pars d: c-name fp-change1 sp-change1 -- }
395: c-name type ." ("
396: fp-change1 sp-change1 pars over + swap u+do
397: i c@ gen-par
398: i 1+ i' < if
399: ." ,"
400: endif
401: loop
402: 2drop ." )" ;
403:
404: : gen-wrapped-const { d: pars d: c-name fp-change1 sp-change1 -- }
405: ." (" c-name type ." )" ;
406:
407: : gen-wrapped-var { d: pars d: c-name fp-change1 sp-change1 -- }
408: ." &(" c-name type ." )" ;
409:
410: create gen-call-types
411: ' gen-wrapped-func ,
412: ' gen-wrapped-const ,
413: ' gen-wrapped-var ,
414:
415: : gen-wrapped-call ( pars c-name fp-change1 sp-change1 -- )
416: 5 pick 3 chars - c@ cells gen-call-types + @ execute ;
417:
418: \ calls for various kinds of return values
419:
420: : gen-wrapped-void ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
421: 2dup 2>r gen-wrapped-call 2r> ;
422:
423: : gen-wrapped-n ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
424: 2dup gen-par-n 2>r ." =" gen-wrapped-call 2r> ;
425:
426: : gen-wrapped-a ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
427: 2dup gen-par-n 2>r ." =(Cell)" gen-wrapped-call 2r> ;
428:
429: : gen-wrapped-d ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
430: ." gforth_ll2d(" gen-wrapped-void
431: ." ," gen-par-n ." ," gen-par-n ." )" ;
432:
433: : gen-wrapped-r ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
434: 2dup gen-par-r 2>r ." =" gen-wrapped-call 2r> ;
435:
436: : gen-wrapped-func ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
437: gen-wrapped-a ;
438:
439: create gen-wrapped-types
440: ' gen-wrapped-n ,
441: ' gen-wrapped-a ,
442: ' gen-wrapped-d ,
443: ' gen-wrapped-r ,
444: ' gen-wrapped-func ,
445: ' gen-wrapped-void ,
446:
447: : gen-wrapped-stmt ( pars c-name fp-change1 sp-change1 ret -- fp-change sp-change )
448: cells gen-wrapped-types + @ execute ;
449:
450: : wrapper-function-name ( addr -- c-addr u )
451: \ addr points to the return type index of a c-function descriptor
452: count { r-type } count { d: pars }
453: pars + count { d: c-name }
454: s" gforth_c_" { d: prefix }
455: prefix nip c-name nip + pars nip + 3 + { u }
456: u allocate throw { c-addr }
457: c-addr u
458: prefix front-string c-name front-string '_ front-char
459: pars bounds u+do
460: i c@ type-letter front-char
461: loop
462: '_ front-char r-type type-letter front-char assert( dup 0= )
463: 2drop c-addr u ;
464:
465: : gen-wrapper-function ( addr -- )
466: \ addr points to the return type index of a c-function descriptor
467: dup { descriptor }
468: count { ret } count 2dup { d: pars } chars + count { d: c-name }
469: ." void " lib-modulename 2@ type ." _LTX_" descriptor wrapper-function-name 2dup type drop free throw
470: .\" (GFORTH_ARGS)\n"
471: .\" {\n Cell MAYBE_UNUSED *sp = gforth_SP;\n Float MAYBE_UNUSED *fp = gforth_FP;\n "
472: pars c-name 2over count-stacks ret gen-wrapped-stmt .\" ;\n"
473: ?dup-if
474: ." gforth_SP = sp+" .nb .\" ;\n"
475: endif
476: ?dup-if
477: ." gforth_FP = fp+" .nb .\" ;\n"
478: endif
479: .\" }\n" ;
480:
481: : scan-back { c-addr u1 c -- c-addr u2 }
482: \ the last occurence of c in c-addr u1 is at u2-1; if it does not
483: \ occur, u2=0.
484: c-addr 1- c-addr u1 + 1- u-do
485: i c@ c = if
486: c-addr i over - 1+ unloop exit endif
487: 1 -loop
488: c-addr 0 ;
489:
490: : dirname ( c-addr1 u1 -- c-addr2 u2 )
491: \ directory name of the file name c-addr1 u1, including the final "/".
492: '/ scan-back ;
493:
494: : basename ( c-addr1 u1 -- c-addr2 u2 )
495: \ file name without directory component
496: 2dup dirname nip /string ;
497:
498: : gen-filename ( x -- c-addr u )
499: \ generates a file basename for lib-handle-addr X
500: 0 <<# ['] #s $10 base-execute #>
501: s" gforth_c_" 2swap s+ #>> ;
502:
503: : libcc-named-dir ( -- c-addr u )
504: libcc-named-dir-v 2@ ;
505:
506: : libcc-tmp-dir ( -- c-addr u )
507: s" ~/.gforth/libcc-tmp/" ;
508:
509: : prepend-dirname ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 )
510: 2over s+ 2swap drop free throw ;
511:
512: : open-wrappers ( -- addr|0 )
513: lib-filename 2@ s" .la" s+
514: 2dup libcc-named-dir string-prefix? if ( c-addr u )
515: \ see if we can open it in the path
516: libcc-named-dir nip /string
517: libcc-path open-path-file if
518: 0 exit endif
519: ( wfile-id c-addr2 u2 ) rot close-file throw save-mem ( c-addr2 u2 )
520: endif
521: \ 2dup cr type
522: 2dup open-lib >r
523: drop free throw r> ;
524:
525: : c-library-name-setup ( c-addr u -- )
526: assert( c-source-file-id @ 0= )
527: { d: filename }
528: here 0 , lib-handle-addr ! filename lib-filename 2!
529: filename basename lib-modulename 2!
530: ['] write-c-prefix-line is save-c-prefix-line ;
531:
532: : c-library-name-create ( -- )
533: lib-filename 2@ s" .c" s+ 2dup w/o create-file throw
534: c-source-file-id !
535: drop free throw ;
536:
537: : c-named-library-name ( c-addr u -- )
538: \ set up filenames for a (possibly new) library; c-addr u is the
539: \ basename of the library
540: libcc-named-dir prepend-dirname c-library-name-setup
541: open-wrappers dup if
542: lib-handle-addr @ !
543: else
544: libcc-named-dir $1ff mkdir-parents drop
545: drop c-library-name-create
546: c-prefix-lines @ ['] print-c-prefix-line \ first line only
547: c-source-file-id @ outfile-execute
548: endif ;
549:
550: : c-tmp-library-name ( c-addr u -- )
551: \ set up filenames for a new library; c-addr u is the basename of
552: \ the library
553: libcc-tmp-dir 2dup $1ff mkdir-parents drop
554: prepend-dirname c-library-name-setup c-library-name-create
555: ['] print-c-prefix-lines c-source-file-id @ outfile-execute ;
556:
557: : lib-handle ( -- addr )
558: lib-handle-addr @ @ ;
559:
560: : init-c-source-file ( -- )
561: lib-handle 0= if
562: c-source-file-id @ 0= if
563: here gen-filename c-tmp-library-name
564: endif
565: endif ;
566:
567: : c-source-file ( -- file-id )
568: c-source-file-id @ assert( dup ) ;
569:
570: : notype-execute ( ... xt -- ... )
571: what's type { oldtype } try
572: ['] 2drop is type execute 0
573: restore
574: oldtype is type
575: endtry
576: throw ;
577:
578: : c-source-file-execute ( ... xt -- ... )
579: \ direct the output of xt to c-source-file, or nothing
580: lib-handle if
581: notype-execute
582: else
583: c-source-file outfile-execute
584: endif ;
585:
586: : .lib-error ( -- )
587: [ifdef] lib-error
588: ['] cr stderr outfile-execute
589: lib-error ['] type stderr outfile-execute
590: [then] ;
591:
592: DEFER compile-wrapper-function ( -- )
593: : compile-wrapper-function1 ( -- )
594: lib-handle 0= if
595: c-source-file close-file throw
596: 0 c-source-file-id !
597: [ libtool-command s" --silent --tag=CC --mode=compile " s+
598: libtool-cc append s" -I '" append
599: s" includedir" getenv append s" '" append ] sliteral
600: s" -O -c " s+ lib-filename 2@ append s" .c -o " append
601: lib-filename 2@ append s" .lo" append ( c-addr u )
602: \ 2dup type cr
603: 2dup system drop free throw $? abort" libtool compile failed"
604: [ libtool-command s" --silent --tag=CC --mode=link " s+
605: libtool-cc append libtool-flags append s" -module -rpath " s+ ] sliteral
606: lib-filename 2@ dirname replace-rpath s+ s" " append
607: lib-filename 2@ append s" .lo -o " append
608: lib-filename 2@ append s" .la" append ( c-addr u )
609: c-libs 2@ append
610: \ 2dup type cr
611: 2dup system drop free throw $? abort" libtool link failed"
612: open-wrappers dup 0= if
613: .lib-error true abort" open-lib failed"
614: endif
615: ( lib-handle ) lib-handle-addr @ !
616: endif
617: lib-filename 2@ drop free throw 0 0 lib-filename 2! ;
618: ' compile-wrapper-function1 IS compile-wrapper-function
619: \ s" ar rcs xxx.a xxx.o" system
620: \ $? abort" ar generated error" ;
621:
622: : link-wrapper-function { cff -- sym }
623: cff cff-rtype wrapper-function-name { d: wrapper-name }
624: wrapper-name cff cff-lha @ @ assert( dup ) lib-sym dup 0= if
625: .lib-error -&32 throw
626: endif
627: wrapper-name drop free throw ;
628:
629: : c-function-ft ( xt-defr xt-cfr xt-parse "c-name" "type signature" -- )
630: \ build time/first time action for c-function
631: { xt-parse-types } init-c-source-file
632: noname create 2, lib-handle-addr @ ,
633: parse-name { d: c-name }
634: xt-parse-types execute c-name string,
635: ['] gen-wrapper-function c-source-file-execute
636: does> ( ... -- ... )
637: dup 2@ { xt-defer xt-cfr }
638: dup cff-lha @ @ 0= if
639: compile-wrapper-function
640: endif
641: link-wrapper-function xt-cfr >body !
642: xt-cfr xt-defer defer!
643: xt-cfr execute ;
644:
645: : c-function-rt ( -- )
646: \ run-time definition for c function; addr is the address where
647: \ the sym should be stored
648: noname create 0 ,
649: does> ( ... -- ... )
650: @ call-c ;
651:
652: : (c-function) ( xt-parse "forth-name" "c-name" "{stack effect}" -- )
653: { xt-parse-types } defer lastxt dup c-function-rt
654: lastxt xt-parse-types c-function-ft
655: lastxt swap defer! ;
656:
657: : c-function ( "forth-name" "c-name" "@{type@}" "---" "type" -- ) \ gforth
658: \G Define a Forth word @i{forth-name}. @i{Forth-name} has the
659: \G specified stack effect and calls the C function @code{c-name}.
660: ['] parse-function-types (c-function) ;
661:
662: : c-value ( "forth-name" "c-name" "[---]" "type" -- ) \ gforth
663: \G Define a Forth word @i{forth-name}. @i{Forth-name} has the
664: \G specified stack effect and gives the C value of @code{c-name}.
665: ['] parse-value-type (c-function) ;
666:
667: : c-variable ( "forth-name" "c-name" -- ) \ gforth
668: \G Define a Forth word @i{forth-name}. @i{Forth-name} returns the
669: \G address of @code{c-name}.
670: ['] parse-variable-type (c-function) ;
671:
672: : clear-libs ( -- ) \ gforth
673: \G Clear the list of libs
674: c-source-file-id @ if
675: compile-wrapper-function
676: endif
677: 0. c-libs 2! ;
678: clear-libs
679:
680: : c-library-incomplete ( -- )
681: true abort" Called function of unfinished named C library" ;
682:
683: : c-library-name ( c-addr u -- ) \ gforth
684: \G Start a C library interface with name @i{c-addr u}.
685: clear-libs
686: ['] c-library-incomplete is compile-wrapper-function
687: c-named-library-name ;
688:
689: : c-library ( "name" -- ) \ gforth
690: \G Parsing version of @code{c-library-name}
691: parse-name save-mem c-library-name ;
692:
693: : end-c-library ( -- ) \ gforth
694: \G Finish and (if necessary) build the latest C library interface.
695: ['] save-c-prefix-line1 is save-c-prefix-line
696: ['] compile-wrapper-function1 is compile-wrapper-function
697: compile-wrapper-function1 ;
698:
699: : init-libcc ( -- )
700: s" ~/.gforth/libcc-named/" libcc-named-dir-v 2!
701: [IFDEF] make-path
702: libcc-path make-path
703: libcc-named-dir libcc-path also-path
704: [ s" libccdir" getenv ] sliteral libcc-path also-path
705: [THEN]
706: ;
707:
708: init-libcc
709:
710: :noname ( -- )
711: defers 'cold
712: init-libcc ;
713: is 'cold
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