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f87489ac WJ |
1 | , %{ |
2 | /* sbc.y: A POSIX bc processor written for minix with no extensions. */ | |
3 | ||
4 | /* This file is part of bc written for MINIX. | |
5 | Copyright (C) 1991 Free Software Foundation, Inc. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License , or | |
10 | (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; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
21 | You may contact the author by: | |
22 | e-mail: phil@cs.wwu.edu | |
23 | us-mail: Philip A. Nelson | |
24 | Computer Science Department, 9062 | |
25 | Western Washington University | |
26 | Bellingham, WA 98226-9062 | |
27 | ||
28 | *************************************************************************/ | |
29 | ||
30 | #include "bcdefs.h" | |
31 | #include "global.h" /* To get the global variables. */ | |
32 | #include "proto.h" | |
33 | %} | |
34 | ||
35 | %start program | |
36 | ||
37 | %union { | |
38 | char *s_value; | |
39 | char c_value; | |
40 | int i_value; | |
41 | arg_list *a_value; | |
42 | } | |
43 | ||
44 | %token <i_value> NEWLINE AND OR NOT | |
45 | %token <s_value> STRING NAME NUMBER | |
46 | /* '-', '+' are tokens themselves */ | |
47 | %token <c_value> MUL_OP | |
48 | /* '*', '/', '%' */ | |
49 | %token <c_value> ASSIGN_OP | |
50 | /* '=', '+=', '-=', '*=', '/=', '%=', '^=' */ | |
51 | %token <s_value> REL_OP | |
52 | /* '==', '<=', '>=', '!=', '<', '>' */ | |
53 | %token <c_value> INCR_DECR | |
54 | /* '++', '--' */ | |
55 | %token <i_value> Define Break Quit Length | |
56 | /* 'define', 'break', 'quit', 'length' */ | |
57 | %token <i_value> Return For If While Sqrt Else | |
58 | /* 'return', 'for', 'if', 'while', 'sqrt', 'else' */ | |
59 | %token <i_value> Scale Ibase Obase Auto Read | |
60 | /* 'scale', 'ibase', 'obase', 'auto', 'read' */ | |
61 | %token <i_value> Warranty, Halt, Last, Continue, Print, Limits | |
62 | /* 'warranty', 'halt', 'last', 'continue', 'print', 'limits' */ | |
63 | ||
64 | /* The types of all other non-terminals. */ | |
65 | %type <i_value> expression named_expression return_expression | |
66 | %type <a_value> opt_parameter_list parameter_list opt_auto_define_list | |
67 | %type <a_value> define_list opt_argument_list argument_list | |
68 | %type <i_value> program input_item semicolon_list statement_list | |
69 | %type <i_value> statement_or_error statement function relational_expression | |
70 | ||
71 | /* precedence */ | |
72 | %nonassoc REL_OP | |
73 | %right ASSIGN_OP | |
74 | %left '+' '-' | |
75 | %left MUL_OP | |
76 | %right '^' | |
77 | %nonassoc UNARY_MINUS | |
78 | %nonassoc INCR_DECR | |
79 | ||
80 | %% | |
81 | program : /* empty */ | |
82 | { | |
83 | $$ = 0; | |
84 | std_only = TRUE; | |
85 | if (interactive) | |
86 | { | |
87 | printf ("s%s\n", BC_VERSION); | |
88 | welcome(); | |
89 | } | |
90 | } | |
91 | | program input_item | |
92 | ; | |
93 | input_item : semicolon_list NEWLINE | |
94 | { run_code(); } | |
95 | | function | |
96 | { run_code(); } | |
97 | | error NEWLINE | |
98 | { | |
99 | yyerrok; | |
100 | init_gen() ; | |
101 | } | |
102 | ; | |
103 | semicolon_list : /* empty */ | |
104 | { $$ = 0; } | |
105 | | statement_or_error | |
106 | | semicolon_list ';' statement_or_error | |
107 | | semicolon_list ';' | |
108 | ; | |
109 | statement_list : /* empty */ | |
110 | { $$ = 0; } | |
111 | | statement | |
112 | | statement_list NEWLINE | |
113 | | statement_list NEWLINE statement | |
114 | | statement_list ';' | |
115 | | statement_list ';' statement | |
116 | ; | |
117 | statement_or_error : statement | |
118 | | error statement | |
119 | { $$ = $2; } | |
120 | ; | |
121 | statement : Warranty | |
122 | { warranty("s"); } | |
123 | | expression | |
124 | { | |
125 | if ($1 & 1) | |
126 | generate ("W"); | |
127 | else | |
128 | generate ("p"); | |
129 | } | |
130 | | STRING | |
131 | { | |
132 | $$ = 0; | |
133 | generate ("w"); | |
134 | generate ($1); | |
135 | free ($1); | |
136 | } | |
137 | | Break | |
138 | { | |
139 | if (break_label == 0) | |
140 | yyerror ("Break outside a for/while"); | |
141 | else | |
142 | { | |
143 | sprintf (genstr, "J%1d:", break_label); | |
144 | generate (genstr); | |
145 | } | |
146 | } | |
147 | | Quit | |
148 | { exit(0); } | |
149 | | Return | |
150 | { generate ("0R"); } | |
151 | | Return '(' return_expression ')' | |
152 | { generate ("R"); } | |
153 | | For | |
154 | { | |
155 | $1 = break_label; | |
156 | break_label = next_label++; | |
157 | } | |
158 | '(' expression ';' | |
159 | { | |
160 | $4 = next_label++; | |
161 | sprintf (genstr, "pN%1d:", $4); | |
162 | generate (genstr); | |
163 | } | |
164 | relational_expression ';' | |
165 | { | |
166 | $7 = next_label++; | |
167 | sprintf (genstr, "B%1d:J%1d:", $7, break_label); | |
168 | generate (genstr); | |
169 | $<i_value>$ = next_label++; | |
170 | sprintf (genstr, "N%1d:", $<i_value>$); | |
171 | generate (genstr); | |
172 | } | |
173 | expression ')' | |
174 | { | |
175 | sprintf (genstr, "pJ%1d:N%1d:", $4, $7); | |
176 | generate (genstr); | |
177 | } | |
178 | statement | |
179 | { | |
180 | sprintf (genstr, "J%1d:N%1d:", $<i_value>9, | |
181 | break_label); | |
182 | generate (genstr); | |
183 | break_label = $1; | |
184 | } | |
185 | | If '(' relational_expression ')' | |
186 | { | |
187 | $3 = next_label++; | |
188 | sprintf (genstr, "Z%1d:", $3); | |
189 | generate (genstr); | |
190 | } | |
191 | statement | |
192 | { | |
193 | sprintf (genstr, "N%1d:", $3); | |
194 | generate (genstr); | |
195 | } | |
196 | | While | |
197 | { | |
198 | $1 = next_label++; | |
199 | sprintf (genstr, "N%1d:", $1); | |
200 | generate (genstr); | |
201 | } | |
202 | '(' relational_expression | |
203 | { | |
204 | $4 = break_label; | |
205 | break_label = next_label++; | |
206 | sprintf (genstr, "Z%1d:", break_label); | |
207 | generate (genstr); | |
208 | } | |
209 | ')' statement | |
210 | { | |
211 | sprintf (genstr, "J%1d:N%1d:", $1, break_label); | |
212 | generate (genstr); | |
213 | break_label = $4; | |
214 | } | |
215 | | '{' statement_list '}' | |
216 | { $$ = 0; } | |
217 | ; | |
218 | function : Define NAME '(' opt_parameter_list ')' '{' | |
219 | NEWLINE opt_auto_define_list | |
220 | { | |
221 | check_params ($4,$8); | |
222 | sprintf (genstr, "F%d,%s.%s[", lookup($2,FUNCT), | |
223 | arg_str ($4,TRUE), arg_str ($8,TRUE)); | |
224 | generate (genstr); | |
225 | free_args ($4); | |
226 | free_args ($8); | |
227 | $1 = next_label; | |
228 | next_label = 0; | |
229 | } | |
230 | statement_list NEWLINE '}' | |
231 | { | |
232 | generate ("0R]"); | |
233 | next_label = $1; | |
234 | } | |
235 | ; | |
236 | opt_parameter_list : /* empty */ | |
237 | { $$ = NULL; } | |
238 | | parameter_list | |
239 | ; | |
240 | parameter_list : NAME | |
241 | { $$ = nextarg (NULL, lookup($1,SIMPLE)); } | |
242 | | define_list ',' NAME | |
243 | { $$ = nextarg ($1, lookup($3,SIMPLE)); } | |
244 | ; | |
245 | opt_auto_define_list : /* empty */ | |
246 | { $$ = NULL; } | |
247 | | Auto define_list NEWLINE | |
248 | { $$ = $2; } | |
249 | | Auto define_list ';' | |
250 | { $$ = $2; } | |
251 | ; | |
252 | define_list : NAME | |
253 | { $$ = nextarg (NULL, lookup($1,SIMPLE)); } | |
254 | | NAME '[' ']' | |
255 | { $$ = nextarg (NULL, lookup($1,ARRAY)); } | |
256 | | define_list ',' NAME | |
257 | { $$ = nextarg ($1, lookup($3,SIMPLE)); } | |
258 | | define_list ',' NAME '[' ']' | |
259 | { $$ = nextarg ($1, lookup($3,ARRAY)); } | |
260 | ; | |
261 | opt_argument_list : /* empty */ | |
262 | { $$ = NULL; } | |
263 | | argument_list | |
264 | ; | |
265 | argument_list : expression | |
266 | { $$ = nextarg (NULL,0); } | |
267 | | argument_list ',' expression | |
268 | { $$ = nextarg ($1,0); } | |
269 | ; | |
270 | relational_expression : expression | |
271 | { $$ = 0; } | |
272 | | expression REL_OP expression | |
273 | { | |
274 | $$ = 0; | |
275 | switch (*($2)) | |
276 | { | |
277 | case '=': | |
278 | generate ("="); | |
279 | break; | |
280 | case '!': | |
281 | generate ("#"); | |
282 | break; | |
283 | case '<': | |
284 | if ($2[1] == '=') | |
285 | generate ("{"); | |
286 | else | |
287 | generate ("<"); | |
288 | break; | |
289 | case '>': | |
290 | if ($2[1] == '=') | |
291 | generate ("}"); | |
292 | else | |
293 | generate (">"); | |
294 | break; | |
295 | } | |
296 | } | |
297 | ; | |
298 | return_expression : /* empty */ | |
299 | { | |
300 | $$ = 0; | |
301 | generate ("0"); | |
302 | } | |
303 | | expression | |
304 | ; | |
305 | expression : named_expression ASSIGN_OP | |
306 | { | |
307 | if ($2 != '=') | |
308 | { | |
309 | if ($1 < 0) | |
310 | sprintf (genstr, "DL%d:", -$1); | |
311 | else | |
312 | sprintf (genstr, "l%d:", $1); | |
313 | generate (genstr); | |
314 | } | |
315 | } | |
316 | expression | |
317 | { | |
318 | $$ = 0; | |
319 | if ($2 != '=') | |
320 | { | |
321 | sprintf (genstr, "%c", $2); | |
322 | generate (genstr); | |
323 | } | |
324 | if ($1 < 0) | |
325 | sprintf (genstr, "S%d:", -$1); | |
326 | else | |
327 | sprintf (genstr, "s%d:", $1); | |
328 | generate (genstr); | |
329 | } | |
330 | | expression '+' expression | |
331 | { generate ("+"); } | |
332 | | expression '-' expression | |
333 | { generate ("-"); } | |
334 | | expression MUL_OP expression | |
335 | { | |
336 | genstr[0] = $2; | |
337 | genstr[1] = 0; | |
338 | generate (genstr); | |
339 | } | |
340 | | expression '^' expression | |
341 | { generate ("^"); } | |
342 | | '-' expression %prec UNARY_MINUS | |
343 | { generate ("n"); $$ = 1;} | |
344 | | named_expression | |
345 | { | |
346 | $$ = 1; | |
347 | if ($1 < 0) | |
348 | sprintf (genstr, "L%d:", -$1); | |
349 | else | |
350 | sprintf (genstr, "l%d:", $1); | |
351 | generate (genstr); | |
352 | } | |
353 | | NUMBER | |
354 | { | |
355 | int len = strlen($1); | |
356 | $$ = 1; | |
357 | if (len == 1 && *$1 == '0') | |
358 | generate ("0"); | |
359 | else | |
360 | { | |
361 | if (len == 1 && *$1 == '1') | |
362 | generate ("1"); | |
363 | else | |
364 | { | |
365 | generate ("K"); | |
366 | generate ($1); | |
367 | generate (":"); | |
368 | } | |
369 | free ($1); | |
370 | } | |
371 | } | |
372 | | '(' expression ')' | |
373 | { $$ = 1; } | |
374 | | NAME '(' opt_argument_list ')' | |
375 | { | |
376 | $$ = 1; | |
377 | if ($3 != NULL) | |
378 | { | |
379 | sprintf (genstr, "C%d,%s:", lookup($1,FUNCT), | |
380 | arg_str ($3,FALSE)); | |
381 | free_args ($3); | |
382 | } | |
383 | else | |
384 | sprintf (genstr, "C%d:", lookup($1,FUNCT)); | |
385 | generate (genstr); | |
386 | } | |
387 | | INCR_DECR named_expression | |
388 | { | |
389 | $$ = 1; | |
390 | if ($2 < 0) | |
391 | { | |
392 | if ($1 == '+') | |
393 | sprintf (genstr, "DA%d:L%d:", -$2, -$2); | |
394 | else | |
395 | sprintf (genstr, "DM%d:L%d:", -$2, -$2); | |
396 | } | |
397 | else | |
398 | { | |
399 | if ($1 == '+') | |
400 | sprintf (genstr, "i%d:l%d:", $2, $2); | |
401 | else | |
402 | sprintf (genstr, "d%d:l%d:", $2, $2); | |
403 | } | |
404 | generate (genstr); | |
405 | } | |
406 | | named_expression INCR_DECR | |
407 | { | |
408 | $$ = 1; | |
409 | if ($1 < 0) | |
410 | { | |
411 | sprintf (genstr, "DL%d:x", -$1); | |
412 | generate (genstr); | |
413 | if ($2 == '+') | |
414 | sprintf (genstr, "A%d:", -$1); | |
415 | else | |
416 | sprintf (genstr, "M%d:", -$1); | |
417 | } | |
418 | else | |
419 | { | |
420 | sprintf (genstr, "l%d:", $1); | |
421 | generate (genstr); | |
422 | if ($2 == '+') | |
423 | sprintf (genstr, "i%d:", $1); | |
424 | else | |
425 | sprintf (genstr, "d%d:", $1); | |
426 | } | |
427 | generate (genstr); | |
428 | } | |
429 | | Length '(' expression ')' | |
430 | { generate ("cL"); $$ = 1;} | |
431 | | Sqrt '(' expression ')' | |
432 | { generate ("cR"); $$ = 1;} | |
433 | | Scale '(' expression ')' | |
434 | { generate ("cS"); $$ = 1;} | |
435 | ; | |
436 | named_expression : NAME | |
437 | { $$ = lookup($1,SIMPLE); } | |
438 | | NAME '[' expression ']' | |
439 | { $$ = lookup($1,ARRAY); } | |
440 | | Ibase | |
441 | { $$ = 0; } | |
442 | | Obase | |
443 | { $$ = 1; } | |
444 | | Scale | |
445 | { $$ = 2; } | |
446 | ; | |
447 | ||
448 | %% |