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| 1 : | anton | 1.1 | \ libcc.fs foreign function interface implemented using a C compiler |
| 2 : | |||
| 3 : | \ Copyright (C) 2006 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 : | |||
| 22 : | \ What this implementation does is this: if it sees a declaration like | ||
| 23 : | |||
| 24 : | \ libc dlseek int dlong int (dlong) lseek ( fd doffset whence -- doffset2 ) | ||
| 25 : | |||
| 26 : | \ it genererates C code similar to the following: | ||
| 27 : | |||
| 28 : | \ #include <gforth.h> | ||
| 29 : | \ | ||
| 30 : | \ void gforth_call_dl_i_dl_i(void) | ||
| 31 : | \ { | ||
| 32 : | \ Cell *sp = gforth_SP; | ||
| 33 : | \ Float *fp = gforth_FP; | ||
| 34 : | \ long (*func)(int, long, int); | ||
| 35 : | \ int arg1; | ||
| 36 : | \ long arg2; | ||
| 37 : | \ int arg3; | ||
| 38 : | \ long result; | ||
| 39 : | \ func = (char *)((Cell *)sp)[0]; | ||
| 40 : | \ arg3 = ((Cell *)sp)[1]; | ||
| 41 : | \ arg2 = gforth_d2ll(sp[3],sp[2]); | ||
| 42 : | \ arg1 = ((Cell *)sp)[4]; | ||
| 43 : | \ result = func(arg1, arg2, arg3); | ||
| 44 : | \ gforth_ll2d(result, sp[4], sp[3]); | ||
| 45 : | \ gforth_SP += 3; | ||
| 46 : | \ } | ||
| 47 : | |||
| 48 : | \ Then it compiles this code and dynamically links it into the Gforth | ||
| 49 : | \ system (batching and caching are future work). It also dynamically | ||
| 50 : | \ links lseek. Performing DLSEEK then puts the function pointer of | ||
| 51 : | \ lseek() on the stack, the function pointer of | ||
| 52 : | \ gforth_call_del_i_dl_i, and calls CALL-C. | ||
| 53 : | |||
| 54 : | |||
| 55 : | s" Library not found" exception constant err-nolib | ||
| 56 : | |||
| 57 : | : library ( "name" "file" -- ) \ gforth | ||
| 58 : | \G Dynamically links the library specified by @i{file}. Defines a | ||
| 59 : | \G word @i{name} ( -- lib ) that starts the declaration of a | ||
| 60 : | \G function from that library. | ||
| 61 : | create parse-name open-lib dup 0= err-nolib and throw , | ||
| 62 : | does> ( -- lib ) | ||
| 63 : | @ ; | ||
| 64 : | |||
| 65 : |
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