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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 : | anton | 1.2 | \ \ something that tells it to include <unistd.h> |
| 25 : | \ \ something that tells it that the current library is libc | ||
| 26 : | |||
| 27 : | \ c-function dlseek lseek n d n -- d | ||
| 28 : | anton | 1.1 | |
| 29 : | \ it genererates C code similar to the following: | ||
| 30 : | |||
| 31 : | \ #include <gforth.h> | ||
| 32 : | anton | 1.2 | \ #include <unistd.h> |
| 33 : | anton | 1.1 | \ |
| 34 : | anton | 1.2 | \ void gforth_c_lseek_ndn_d(void) |
| 35 : | anton | 1.1 | \ { |
| 36 : | \ Cell *sp = gforth_SP; | ||
| 37 : | \ Float *fp = gforth_FP; | ||
| 38 : | anton | 1.2 | \ long long result; /* longest type in C */ |
| 39 : | \ gforth_ll2d(lseek(sp[3],gforth_d2ll(sp[2],sp[1]),sp[0]),sp[3],sp[2]); | ||
| 40 : | \ gforth_SP = sp+2; | ||
| 41 : | anton | 1.1 | \ } |
| 42 : | |||
| 43 : | \ Then it compiles this code and dynamically links it into the Gforth | ||
| 44 : | \ system (batching and caching are future work). It also dynamically | ||
| 45 : | \ links lseek. Performing DLSEEK then puts the function pointer of | ||
| 46 : | anton | 1.2 | \ the function pointer of gforth_c_lseek_ndn_d on the stack and |
| 47 : | \ calls CALL-C. | ||
| 48 : | |||
| 49 : | \ other things to do: | ||
| 50 : | |||
| 51 : | \ c-variable forth-name c-name | ||
| 52 : | \ c-constant forth-name c-name | ||
| 53 : | |||
| 54 : | |||
| 55 : | \ data structures | ||
| 56 : | |||
| 57 : | \ c-function word body: | ||
| 58 : | \ cell function pointer | ||
| 59 : | \ char return type index | ||
| 60 : | \ char parameter count n | ||
| 61 : | \ char*n parameters (type indices) | ||
| 62 : | \ counted string: c-name | ||
| 63 : | |||
| 64 : | : .n ( n -- ) | ||
| 65 : | 0 .r ; | ||
| 66 : | |||
| 67 : | : const+ ( n1 "name" -- n2 ) | ||
| 68 : | dup constant 1+ ; | ||
| 69 : | |||
| 70 : | wordlist constant libcc-types | ||
| 71 : | |||
| 72 : | get-current libcc-types set-current | ||
| 73 : | |||
| 74 : | \ index values | ||
| 75 : | -1 | ||
| 76 : | const+ -- \ end of arguments | ||
| 77 : | const+ n \ integer cell | ||
| 78 : | const+ p \ pointer cell | ||
| 79 : | const+ d \ double | ||
| 80 : | const+ r \ float | ||
| 81 : | const+ func \ C function pointer | ||
| 82 : | const+ void | ||
| 83 : | drop | ||
| 84 : | |||
| 85 : | set-current | ||
| 86 : | |||
| 87 : | : parse-libcc-type ( "libcc-type" -- u ) | ||
| 88 : | parse-name libcc-types search-wordlist 0= -13 and throw execute ; | ||
| 89 : | |||
| 90 : | : parse-function-types ( "{libcc-type}" "--" "libcc-type" -- ) | ||
| 91 : | here 2 chars allot here begin | ||
| 92 : | parse-libcc-type dup 0>= while | ||
| 93 : | c, | ||
| 94 : | repeat | ||
| 95 : | drop swap - over char+ c! | ||
| 96 : | parse-libcc-type 0< -32 and throw swap c! ; | ||
| 97 : | |||
| 98 : | : type-letter ( n -- c ) | ||
| 99 : | chars s" npdrfv" drop + c@ ; | ||
| 100 : | |||
| 101 : | \ count-stacks | ||
| 102 : | |||
| 103 : | : count-stacks-n ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) | ||
| 104 : | 1+ ; | ||
| 105 : | |||
| 106 : | : count-stacks-p ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) | ||
| 107 : | 1+ ; | ||
| 108 : | |||
| 109 : | : count-stacks-d ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) | ||
| 110 : | 2 + ; | ||
| 111 : | |||
| 112 : | : count-stacks-r ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) | ||
| 113 : | swap 1+ swap ; | ||
| 114 : | |||
| 115 : | : count-stacks-func ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) | ||
| 116 : | 1+ ; | ||
| 117 : | |||
| 118 : | : count-stacks-void ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) | ||
| 119 : | ; | ||
| 120 : | |||
| 121 : | create count-stacks-types | ||
| 122 : | ' count-stacks-n , | ||
| 123 : | ' count-stacks-p , | ||
| 124 : | ' count-stacks-d , | ||
| 125 : | ' count-stacks-r , | ||
| 126 : | ' count-stacks-func , | ||
| 127 : | ' count-stacks-void , | ||
| 128 : | |||
| 129 : | : count-stacks ( pars -- fp-change sp-change ) | ||
| 130 : | \ pars is an addr u pair | ||
| 131 : | 0 0 2swap over + swap u+do | ||
| 132 : | i c@ cells count-stacks-type + @ execute | ||
| 133 : | loop ; | ||
| 134 : | |||
| 135 : | \ gen-pars | ||
| 136 : | |||
| 137 : | : gen-par-n ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) | ||
| 138 : | 1- dup ." sp[" .n ." ]" ; | ||
| 139 : | |||
| 140 : | : gen-par-p ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) | ||
| 141 : | ." (void *)(" gen-par-n ." )" ; | ||
| 142 : | |||
| 143 : | : gen-par-d ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) | ||
| 144 : | ." gforthd2ll(" gen-par-n ." ," gen-par-n ." )" ; | ||
| 145 : | |||
| 146 : | : gen-par-r ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) | ||
| 147 : | swap 1- tuck ." fp[" .n ." ]" ; | ||
| 148 : | |||
| 149 : | : gen-par-func ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) | ||
| 150 : | gen-par-p ; | ||
| 151 : | |||
| 152 : | : gen-par-void ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) | ||
| 153 : | -32 throw ; | ||
| 154 : | |||
| 155 : | create gen-par-types | ||
| 156 : | ' gen-par-n , | ||
| 157 : | ' gen-par-p , | ||
| 158 : | ' gen-par-d , | ||
| 159 : | ' gen-par-r , | ||
| 160 : | ' gen-par-func , | ||
| 161 : | ' gen-par-void , | ||
| 162 : | |||
| 163 : | : gen-par ( fp-depth1 sp-depth1 partype -- fp-depth2 sp-depth2 ) | ||
| 164 : | cells gen-par-types @ execute ; | ||
| 165 : | |||
| 166 : | \ the call itself | ||
| 167 : | |||
| 168 : | : gen-wrapped-call { d: pars d: c-name fp-change1 sp-change1 -- } | ||
| 169 : | c-name type ." (" | ||
| 170 : | fp-change1 sp-change1 pars over + swap u+do | ||
| 171 : | i c@ gen-par | ||
| 172 : | i 1+ i' < if | ||
| 173 : | ." ," | ||
| 174 : | endif | ||
| 175 : | loop | ||
| 176 : | 2drop ." )" ; | ||
| 177 : | |||
| 178 : | \ calls for various kinds of return values | ||
| 179 : | |||
| 180 : | : gen-wrapped-void ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) | ||
| 181 : | 2dup 2>r gen-wrapped-call 2r> ; | ||
| 182 : | |||
| 183 : | create gen-wrapped-types | ||
| 184 : | ' gen-wrapped-n , | ||
| 185 : | ' gen-wrapped-p , | ||
| 186 : | ' gen-wrapped-d , | ||
| 187 : | ' gen-wrapped-r , | ||
| 188 : | ' gen-wrapped-func , | ||
| 189 : | ' gen-wrapped-void , | ||
| 190 : | |||
| 191 : | : gen-wrapped-stmt ( pars c-name fp-change1 sp-change1 ret -- fp-change sp-change ) | ||
| 192 : | cells gen-wrapped-types @ execute ; | ||
| 193 : | |||
| 194 : | : gen-wrapper-function ( addr -- ) | ||
| 195 : | \ addr points to the return type index of a c-function descriptor | ||
| 196 : | c@+ { ret } count 2dup { d: pars } chars + count { d: c-name } | ||
| 197 : | ." void gforth_c_" c-name type ." _" | ||
| 198 : | pars 0 +do | ||
| 199 : | i chars over + c@ type-letter emit | ||
| 200 : | loop | ||
| 201 : | ." _" ret type-letter emit .\" (void)\n" | ||
| 202 : | .\" {\n Cell *sp = gforth_SP;\n Float *fp = gforth_FP;" | ||
| 203 : | pars c-name 2over count-stacks ret gen-wrapped-stmt .\" ;\n" | ||
| 204 : | ?dup-if | ||
| 205 : | ." gforth_SP = sp+" .n .\" ;\n" | ||
| 206 : | endif | ||
| 207 : | ?dup-if | ||
| 208 : | ." gforth_FP = fp+" .n .\" ;\n" | ||
| 209 : | endif | ||
| 210 : | ." }\n" ; | ||
| 211 : | |||
| 212 : | : c-function ( "forth-name" "c-name" "{libcc-type}" "--" "libcc-type" -- ) | ||
| 213 : | create here >r 0 , \ place for the wrapper function pointer | ||
| 214 : | parse-name { d: c-name } | ||
| 215 : | parse-function-types c-name string, | ||
| 216 : | r> cell+ gen-wrapper-function | ||
| 217 : | compile-wrapper-function | ||
| 218 : | link-wrapper-function | ||
| 219 : | r> ! | ||
| 220 : | does> ( ... -- ... ) | ||
| 221 : | @ call-c ; | ||
| 222 : | |||
| 223 : | |||
| 224 : | |||
| 225 : | anton | 1.1 | |
| 226 : | |||
| 227 : | s" Library not found" exception constant err-nolib | ||
| 228 : | |||
| 229 : | : library ( "name" "file" -- ) \ gforth | ||
| 230 : | \G Dynamically links the library specified by @i{file}. Defines a | ||
| 231 : | \G word @i{name} ( -- lib ) that starts the declaration of a | ||
| 232 : | \G function from that library. | ||
| 233 : | create parse-name open-lib dup 0= err-nolib and throw , | ||
| 234 : | does> ( -- lib ) | ||
| 235 : | @ ; | ||
| 236 : | |||
| 237 : |
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