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3d6b6a90 JG |
1 | /* YACC grammar for Modula-2 expressions, for GDB. |
2 | Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc. | |
3 | Generated from expread.y (now c-exp.y) and contributed by the Department | |
4 | of Computer Science at the State University of New York at Buffalo, 1991. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
21 | ||
22 | /* Parse a Modula-2 expression from text in a string, | |
23 | and return the result as a struct expression pointer. | |
24 | That structure contains arithmetic operations in reverse polish, | |
25 | with constants represented by operations that are followed by special data. | |
26 | See expression.h for the details of the format. | |
27 | What is important here is that it can be built up sequentially | |
28 | during the process of parsing; the lower levels of the tree always | |
29 | come first in the result. */ | |
30 | ||
31 | %{ | |
32 | #include <stdio.h> | |
33 | #include <string.h> | |
34 | #include "defs.h" | |
35 | #include "param.h" | |
36 | #include "symtab.h" | |
37 | #include "frame.h" | |
38 | #include "expression.h" | |
39 | #include "language.h" | |
40 | #include "parser-defs.h" | |
41 | ||
42 | /* These MUST be included in any grammar file!!!! | |
43 | Please choose unique names! */ | |
44 | #define yyparse m2_parse | |
45 | #define yylex m2_lex | |
46 | #define yyerror m2_error | |
47 | #define yylval m2_lval | |
48 | #define yychar m2_char | |
49 | #define yydebug m2_debug | |
50 | #define yypact m2_pact | |
51 | #define yyr1 m2_r1 | |
52 | #define yyr2 m2_r2 | |
53 | #define yydef m2_def | |
54 | #define yychk m2_chk | |
55 | #define yypgo m2_pgo | |
56 | #define yyact m2_act | |
57 | #define yyexca m2_exca | |
58 | ||
59 | void yyerror (); | |
60 | ||
61 | /* The sign of the number being parsed. */ | |
62 | int number_sign = 1; | |
63 | ||
64 | /* The block that the module specified by the qualifer on an identifer is | |
65 | contained in, */ | |
66 | struct block *modblock=0; | |
67 | ||
68 | char *make_qualname(); | |
69 | ||
70 | /* #define YYDEBUG 1 */ | |
71 | ||
72 | %} | |
73 | ||
74 | /* Although the yacc "value" of an expression is not used, | |
75 | since the result is stored in the structure being created, | |
76 | other node types do have values. */ | |
77 | ||
78 | %union | |
79 | { | |
80 | LONGEST lval; | |
81 | unsigned LONGEST ulval; | |
82 | double dval; | |
83 | struct symbol *sym; | |
84 | struct type *tval; | |
85 | struct stoken sval; | |
86 | int voidval; | |
87 | struct block *bval; | |
88 | enum exp_opcode opcode; | |
89 | struct internalvar *ivar; | |
90 | ||
91 | struct type **tvec; | |
92 | int *ivec; | |
93 | } | |
94 | ||
95 | %type <voidval> exp type_exp start set | |
96 | %type <voidval> variable | |
97 | %type <tval> type | |
98 | %type <bval> block | |
99 | %type <sym> fblock | |
100 | ||
101 | %token <lval> INT HEX ERROR | |
102 | %token <ulval> UINT TRUE FALSE CHAR | |
103 | %token <dval> FLOAT | |
104 | ||
105 | /* Both NAME and TYPENAME tokens represent symbols in the input, | |
106 | and both convey their data as strings. | |
107 | But a TYPENAME is a string that happens to be defined as a typedef | |
108 | or builtin type name (such as int or char) | |
109 | and a NAME is any other symbol. | |
110 | ||
111 | Contexts where this distinction is not important can use the | |
112 | nonterminal "name", which matches either NAME or TYPENAME. */ | |
113 | ||
114 | %token <sval> STRING | |
115 | %token <sval> NAME BLOCKNAME IDENT CONST VARNAME | |
116 | %token <sval> TYPENAME | |
117 | ||
118 | %token SIZE CAP ORD HIGH ABS MIN MAX FLOAT_FUNC VAL CHR ODD TRUNC | |
119 | %token INC DEC INCL EXCL | |
120 | ||
121 | /* The GDB scope operator */ | |
122 | %token COLONCOLON | |
123 | ||
124 | %token <lval> LAST REGNAME | |
125 | ||
126 | %token <ivar> INTERNAL_VAR | |
127 | ||
128 | /* M2 tokens */ | |
129 | %left ',' | |
130 | %left ABOVE_COMMA | |
131 | %nonassoc ASSIGN | |
132 | %left '<' '>' LEQ GEQ '=' NOTEQUAL '#' IN | |
133 | %left OR | |
134 | %left AND '&' | |
135 | %left '@' | |
136 | %left '+' '-' | |
137 | %left '*' '/' DIV MOD | |
138 | %right UNARY | |
139 | %right '^' DOT '[' '(' | |
140 | %right NOT '~' | |
141 | %left COLONCOLON QID | |
142 | /* This is not an actual token ; it is used for precedence. | |
143 | %right QID | |
144 | */ | |
145 | %% | |
146 | ||
147 | start : exp | |
148 | | type_exp | |
149 | ; | |
150 | ||
151 | type_exp: type | |
152 | { write_exp_elt_opcode(OP_TYPE); | |
153 | write_exp_elt_type($1); | |
154 | write_exp_elt_opcode(OP_TYPE); | |
155 | } | |
156 | ; | |
157 | ||
158 | /* Expressions */ | |
159 | ||
160 | exp : exp '^' %prec UNARY | |
161 | { write_exp_elt_opcode (UNOP_IND); } | |
162 | ||
163 | exp : '-' | |
164 | { number_sign = -1; } | |
165 | exp %prec UNARY | |
166 | { number_sign = 1; | |
167 | write_exp_elt_opcode (UNOP_NEG); } | |
168 | ; | |
169 | ||
170 | exp : '+' exp %prec UNARY | |
171 | { write_exp_elt_opcode(UNOP_PLUS); } | |
172 | ; | |
173 | ||
174 | exp : not_exp exp %prec UNARY | |
175 | { write_exp_elt_opcode (UNOP_ZEROP); } | |
176 | ; | |
177 | ||
178 | not_exp : NOT | |
179 | | '~' | |
180 | ; | |
181 | ||
182 | exp : CAP '(' exp ')' | |
183 | { write_exp_elt_opcode (UNOP_CAP); } | |
184 | ; | |
185 | ||
186 | exp : ORD '(' exp ')' | |
187 | { write_exp_elt_opcode (UNOP_ORD); } | |
188 | ; | |
189 | ||
190 | exp : ABS '(' exp ')' | |
191 | { write_exp_elt_opcode (UNOP_ABS); } | |
192 | ; | |
193 | ||
194 | exp : HIGH '(' exp ')' | |
195 | { write_exp_elt_opcode (UNOP_HIGH); } | |
196 | ; | |
197 | ||
198 | exp : MIN '(' type ')' | |
199 | { write_exp_elt_opcode (UNOP_MIN); | |
200 | write_exp_elt_type ($3); | |
201 | write_exp_elt_opcode (UNOP_MIN); } | |
202 | ; | |
203 | ||
204 | exp : MAX '(' type ')' | |
205 | { write_exp_elt_opcode (UNOP_MAX); | |
206 | write_exp_elt_type ($3); | |
207 | write_exp_elt_opcode (UNOP_MIN); } | |
208 | ; | |
209 | ||
210 | exp : FLOAT_FUNC '(' exp ')' | |
211 | { write_exp_elt_opcode (UNOP_FLOAT); } | |
212 | ; | |
213 | ||
214 | exp : VAL '(' type ',' exp ')' | |
215 | { write_exp_elt_opcode (BINOP_VAL); | |
216 | write_exp_elt_type ($3); | |
217 | write_exp_elt_opcode (BINOP_VAL); } | |
218 | ; | |
219 | ||
220 | exp : CHR '(' exp ')' | |
221 | { write_exp_elt_opcode (UNOP_CHR); } | |
222 | ; | |
223 | ||
224 | exp : ODD '(' exp ')' | |
225 | { write_exp_elt_opcode (UNOP_ODD); } | |
226 | ; | |
227 | ||
228 | exp : TRUNC '(' exp ')' | |
229 | { write_exp_elt_opcode (UNOP_TRUNC); } | |
230 | ; | |
231 | ||
232 | exp : SIZE exp %prec UNARY | |
233 | { write_exp_elt_opcode (UNOP_SIZEOF); } | |
234 | ; | |
235 | ||
236 | ||
237 | exp : INC '(' exp ')' | |
238 | { write_exp_elt_opcode(UNOP_PREINCREMENT); } | |
239 | ; | |
240 | ||
241 | exp : INC '(' exp ',' exp ')' | |
242 | { write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); | |
243 | write_exp_elt_opcode(BINOP_ADD); | |
244 | write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); } | |
245 | ; | |
246 | ||
247 | exp : DEC '(' exp ')' | |
248 | { write_exp_elt_opcode(UNOP_PREDECREMENT);} | |
249 | ; | |
250 | ||
251 | exp : DEC '(' exp ',' exp ')' | |
252 | { write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); | |
253 | write_exp_elt_opcode(BINOP_SUB); | |
254 | write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); } | |
255 | ; | |
256 | ||
257 | exp : exp DOT NAME | |
258 | { write_exp_elt_opcode (STRUCTOP_STRUCT); | |
259 | write_exp_string ($3); | |
260 | write_exp_elt_opcode (STRUCTOP_STRUCT); } | |
261 | ; | |
262 | ||
263 | exp : set | |
264 | ; | |
265 | ||
266 | exp : exp IN set | |
267 | { error("Sets are not implemented.");} | |
268 | ; | |
269 | ||
270 | exp : INCL '(' exp ',' exp ')' | |
271 | { error("Sets are not implemented.");} | |
272 | ; | |
273 | ||
274 | exp : EXCL '(' exp ',' exp ')' | |
275 | { error("Sets are not implemented.");} | |
276 | ||
277 | set : '{' arglist '}' | |
278 | { error("Sets are not implemented.");} | |
279 | | type '{' arglist '}' | |
280 | { error("Sets are not implemented.");} | |
281 | ; | |
282 | ||
283 | ||
284 | /* Modula-2 array subscript notation [a,b,c...] */ | |
285 | exp : exp '[' | |
286 | /* This function just saves the number of arguments | |
287 | that follow in the list. It is *not* specific to | |
288 | function types */ | |
289 | { start_arglist(); } | |
290 | non_empty_arglist ']' %prec DOT | |
291 | { write_exp_elt_opcode (BINOP_MULTI_SUBSCRIPT); | |
292 | write_exp_elt_longcst ((LONGEST) end_arglist()); | |
293 | write_exp_elt_opcode (BINOP_MULTI_SUBSCRIPT); } | |
294 | ; | |
295 | ||
296 | exp : exp '(' | |
297 | /* This is to save the value of arglist_len | |
298 | being accumulated by an outer function call. */ | |
299 | { start_arglist (); } | |
300 | arglist ')' %prec DOT | |
301 | { write_exp_elt_opcode (OP_FUNCALL); | |
302 | write_exp_elt_longcst ((LONGEST) end_arglist ()); | |
303 | write_exp_elt_opcode (OP_FUNCALL); } | |
304 | ; | |
305 | ||
306 | arglist : | |
307 | ; | |
308 | ||
309 | arglist : exp | |
310 | { arglist_len = 1; } | |
311 | ; | |
312 | ||
313 | arglist : arglist ',' exp %prec ABOVE_COMMA | |
314 | { arglist_len++; } | |
315 | ; | |
316 | ||
317 | non_empty_arglist | |
318 | : exp | |
319 | { arglist_len = 1; } | |
320 | ; | |
321 | ||
322 | non_empty_arglist | |
323 | : non_empty_arglist ',' exp %prec ABOVE_COMMA | |
324 | { arglist_len++; } | |
325 | ; | |
326 | ||
327 | /* GDB construct */ | |
328 | exp : '{' type '}' exp %prec UNARY | |
329 | { write_exp_elt_opcode (UNOP_MEMVAL); | |
330 | write_exp_elt_type ($2); | |
331 | write_exp_elt_opcode (UNOP_MEMVAL); } | |
332 | ; | |
333 | ||
334 | exp : type '(' exp ')' %prec UNARY | |
335 | { write_exp_elt_opcode (UNOP_CAST); | |
336 | write_exp_elt_type ($1); | |
337 | write_exp_elt_opcode (UNOP_CAST); } | |
338 | ; | |
339 | ||
340 | exp : '(' exp ')' | |
341 | { } | |
342 | ; | |
343 | ||
344 | /* Binary operators in order of decreasing precedence. Note that some | |
345 | of these operators are overloaded! (ie. sets) */ | |
346 | ||
347 | /* GDB construct */ | |
348 | exp : exp '@' exp | |
349 | { write_exp_elt_opcode (BINOP_REPEAT); } | |
350 | ; | |
351 | ||
352 | exp : exp '*' exp | |
353 | { write_exp_elt_opcode (BINOP_MUL); } | |
354 | ; | |
355 | ||
356 | exp : exp '/' exp | |
357 | { write_exp_elt_opcode (BINOP_DIV); } | |
358 | ; | |
359 | ||
360 | exp : exp DIV exp | |
361 | { write_exp_elt_opcode (BINOP_INTDIV); } | |
362 | ; | |
363 | ||
364 | exp : exp MOD exp | |
365 | { write_exp_elt_opcode (BINOP_REM); } | |
366 | ; | |
367 | ||
368 | exp : exp '+' exp | |
369 | { write_exp_elt_opcode (BINOP_ADD); } | |
370 | ; | |
371 | ||
372 | exp : exp '-' exp | |
373 | { write_exp_elt_opcode (BINOP_SUB); } | |
374 | ; | |
375 | ||
376 | exp : exp '=' exp | |
377 | { write_exp_elt_opcode (BINOP_EQUAL); } | |
378 | ; | |
379 | ||
380 | exp : exp NOTEQUAL exp | |
381 | { write_exp_elt_opcode (BINOP_NOTEQUAL); } | |
382 | | exp '#' exp | |
383 | { write_exp_elt_opcode (BINOP_NOTEQUAL); } | |
384 | ; | |
385 | ||
386 | exp : exp LEQ exp | |
387 | { write_exp_elt_opcode (BINOP_LEQ); } | |
388 | ; | |
389 | ||
390 | exp : exp GEQ exp | |
391 | { write_exp_elt_opcode (BINOP_GEQ); } | |
392 | ; | |
393 | ||
394 | exp : exp '<' exp | |
395 | { write_exp_elt_opcode (BINOP_LESS); } | |
396 | ; | |
397 | ||
398 | exp : exp '>' exp | |
399 | { write_exp_elt_opcode (BINOP_GTR); } | |
400 | ; | |
401 | ||
402 | exp : exp AND exp | |
403 | { write_exp_elt_opcode (BINOP_AND); } | |
404 | ; | |
405 | ||
406 | exp : exp '&' exp | |
407 | { write_exp_elt_opcode (BINOP_AND); } | |
408 | ; | |
409 | ||
410 | exp : exp OR exp | |
411 | { write_exp_elt_opcode (BINOP_OR); } | |
412 | ; | |
413 | ||
414 | exp : exp ASSIGN exp | |
415 | { write_exp_elt_opcode (BINOP_ASSIGN); } | |
416 | ; | |
417 | ||
418 | ||
419 | /* Constants */ | |
420 | ||
421 | exp : TRUE | |
422 | { write_exp_elt_opcode (OP_BOOL); | |
423 | write_exp_elt_longcst ((LONGEST) $1); | |
424 | write_exp_elt_opcode (OP_BOOL); } | |
425 | ; | |
426 | ||
427 | exp : FALSE | |
428 | { write_exp_elt_opcode (OP_BOOL); | |
429 | write_exp_elt_longcst ((LONGEST) $1); | |
430 | write_exp_elt_opcode (OP_BOOL); } | |
431 | ; | |
432 | ||
433 | exp : INT | |
434 | { write_exp_elt_opcode (OP_LONG); | |
435 | write_exp_elt_type (builtin_type_m2_int); | |
436 | write_exp_elt_longcst ((LONGEST) $1); | |
437 | write_exp_elt_opcode (OP_LONG); } | |
438 | ; | |
439 | ||
440 | exp : UINT | |
441 | { | |
442 | write_exp_elt_opcode (OP_LONG); | |
443 | write_exp_elt_type (builtin_type_m2_card); | |
444 | write_exp_elt_longcst ((LONGEST) $1); | |
445 | write_exp_elt_opcode (OP_LONG); | |
446 | } | |
447 | ; | |
448 | ||
449 | exp : CHAR | |
450 | { write_exp_elt_opcode (OP_LONG); | |
451 | write_exp_elt_type (builtin_type_m2_char); | |
452 | write_exp_elt_longcst ((LONGEST) $1); | |
453 | write_exp_elt_opcode (OP_LONG); } | |
454 | ; | |
455 | ||
456 | ||
457 | exp : FLOAT | |
458 | { write_exp_elt_opcode (OP_DOUBLE); | |
459 | write_exp_elt_type (builtin_type_m2_real); | |
460 | write_exp_elt_dblcst ($1); | |
461 | write_exp_elt_opcode (OP_DOUBLE); } | |
462 | ; | |
463 | ||
464 | exp : variable | |
465 | ; | |
466 | ||
467 | /* The GDB internal variable $$, et al. */ | |
468 | exp : LAST | |
469 | { write_exp_elt_opcode (OP_LAST); | |
470 | write_exp_elt_longcst ((LONGEST) $1); | |
471 | write_exp_elt_opcode (OP_LAST); } | |
472 | ; | |
473 | ||
474 | exp : REGNAME | |
475 | { write_exp_elt_opcode (OP_REGISTER); | |
476 | write_exp_elt_longcst ((LONGEST) $1); | |
477 | write_exp_elt_opcode (OP_REGISTER); } | |
478 | ; | |
479 | ||
480 | exp : SIZE '(' type ')' %prec UNARY | |
481 | { write_exp_elt_opcode (OP_LONG); | |
482 | write_exp_elt_type (builtin_type_int); | |
483 | write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3)); | |
484 | write_exp_elt_opcode (OP_LONG); } | |
485 | ; | |
486 | ||
487 | exp : STRING | |
488 | { write_exp_elt_opcode (OP_M2_STRING); | |
489 | write_exp_string ($1); | |
490 | write_exp_elt_opcode (OP_M2_STRING); } | |
491 | ; | |
492 | ||
493 | /* This will be used for extensions later. Like adding modules. */ | |
494 | block : fblock | |
495 | { $$ = SYMBOL_BLOCK_VALUE($1); } | |
496 | ; | |
497 | ||
498 | fblock : BLOCKNAME | |
499 | { struct symbol *sym | |
500 | = lookup_symbol (copy_name ($1), expression_context_block, | |
501 | VAR_NAMESPACE, 0, NULL); | |
502 | $$ = sym;} | |
503 | ; | |
504 | ||
505 | ||
506 | /* GDB scope operator */ | |
507 | fblock : block COLONCOLON BLOCKNAME | |
508 | { struct symbol *tem | |
509 | = lookup_symbol (copy_name ($3), $1, | |
510 | VAR_NAMESPACE, 0, NULL); | |
511 | if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK) | |
512 | error ("No function \"%s\" in specified context.", | |
513 | copy_name ($3)); | |
514 | $$ = tem; | |
515 | } | |
516 | ; | |
517 | ||
518 | /* Useful for assigning to PROCEDURE variables */ | |
519 | variable: fblock | |
520 | { write_exp_elt_opcode(OP_VAR_VALUE); | |
521 | write_exp_elt_sym ($1); | |
522 | write_exp_elt_opcode (OP_VAR_VALUE); } | |
523 | ; | |
524 | ||
525 | /* GDB internal ($foo) variable */ | |
526 | variable: INTERNAL_VAR | |
527 | { write_exp_elt_opcode (OP_INTERNALVAR); | |
528 | write_exp_elt_intern ($1); | |
529 | write_exp_elt_opcode (OP_INTERNALVAR); } | |
530 | ; | |
531 | ||
532 | /* GDB scope operator */ | |
533 | variable: block COLONCOLON NAME | |
534 | { struct symbol *sym; | |
535 | sym = lookup_symbol (copy_name ($3), $1, | |
536 | VAR_NAMESPACE, 0, NULL); | |
537 | if (sym == 0) | |
538 | error ("No symbol \"%s\" in specified context.", | |
539 | copy_name ($3)); | |
540 | ||
541 | write_exp_elt_opcode (OP_VAR_VALUE); | |
542 | write_exp_elt_sym (sym); | |
543 | write_exp_elt_opcode (OP_VAR_VALUE); } | |
544 | ; | |
545 | ||
546 | /* Base case for variables. */ | |
547 | variable: NAME | |
548 | { struct symbol *sym; | |
549 | int is_a_field_of_this; | |
550 | ||
551 | sym = lookup_symbol (copy_name ($1), | |
552 | expression_context_block, | |
553 | VAR_NAMESPACE, | |
554 | &is_a_field_of_this, | |
555 | NULL); | |
556 | if (sym) | |
557 | { | |
558 | switch (sym->class) | |
559 | { | |
560 | case LOC_REGISTER: | |
561 | case LOC_ARG: | |
562 | case LOC_LOCAL: | |
563 | if (innermost_block == 0 || | |
564 | contained_in (block_found, | |
565 | innermost_block)) | |
566 | innermost_block = block_found; | |
567 | } | |
568 | write_exp_elt_opcode (OP_VAR_VALUE); | |
569 | write_exp_elt_sym (sym); | |
570 | write_exp_elt_opcode (OP_VAR_VALUE); | |
571 | } | |
572 | else | |
573 | { | |
574 | register int i; | |
575 | register char *arg = copy_name ($1); | |
576 | ||
577 | for (i = 0; i < misc_function_count; i++) | |
578 | if (!strcmp (misc_function_vector[i].name, arg)) | |
579 | break; | |
580 | ||
581 | if (i < misc_function_count) | |
582 | { | |
583 | enum misc_function_type mft = | |
584 | (enum misc_function_type) | |
585 | misc_function_vector[i].type; | |
586 | ||
587 | write_exp_elt_opcode (OP_LONG); | |
588 | write_exp_elt_type (builtin_type_int); | |
589 | write_exp_elt_longcst ((LONGEST) misc_function_vector[i].address); | |
590 | write_exp_elt_opcode (OP_LONG); | |
591 | write_exp_elt_opcode (UNOP_MEMVAL); | |
592 | if (mft == mf_data || mft == mf_bss) | |
593 | write_exp_elt_type (builtin_type_int); | |
594 | else if (mft == mf_text) | |
595 | write_exp_elt_type (lookup_function_type (builtin_type_int)); | |
596 | else | |
597 | write_exp_elt_type (builtin_type_char); | |
598 | write_exp_elt_opcode (UNOP_MEMVAL); | |
599 | } | |
600 | else if (symtab_list == 0 | |
601 | && partial_symtab_list == 0) | |
602 | error ("No symbol table is loaded. Use the \"symbol-file\" command."); | |
603 | else | |
604 | error ("No symbol \"%s\" in current context.", | |
605 | copy_name ($1)); | |
606 | } | |
607 | } | |
608 | ; | |
609 | ||
610 | type | |
611 | : TYPENAME | |
612 | { $$ = lookup_typename (copy_name ($1), | |
613 | expression_context_block, 0); } | |
614 | ||
615 | ; | |
616 | ||
617 | %% | |
618 | ||
619 | #if 0 /* FIXME! */ | |
620 | int | |
621 | overflow(a,b) | |
622 | long a,b; | |
623 | { | |
624 | return (MAX_OF_TYPE(builtin_type_m2_int) - b) < a; | |
625 | } | |
626 | ||
627 | int | |
628 | uoverflow(a,b) | |
629 | unsigned long a,b; | |
630 | { | |
631 | return (MAX_OF_TYPE(builtin_type_m2_card) - b) < a; | |
632 | } | |
633 | #endif /* FIXME */ | |
634 | ||
635 | /* Take care of parsing a number (anything that starts with a digit). | |
636 | Set yylval and return the token type; update lexptr. | |
637 | LEN is the number of characters in it. */ | |
638 | ||
639 | /*** Needs some error checking for the float case ***/ | |
640 | ||
641 | static int | |
642 | parse_number (olen) | |
643 | int olen; | |
644 | { | |
645 | register char *p = lexptr; | |
646 | register LONGEST n = 0; | |
647 | register LONGEST prevn = 0; | |
648 | register int c,i,ischar=0; | |
649 | register int base = input_radix; | |
650 | register int len = olen; | |
651 | char *err_copy; | |
652 | int unsigned_p = number_sign == 1 ? 1 : 0; | |
653 | ||
654 | extern double atof (); | |
655 | ||
656 | if(p[len-1] == 'H') | |
657 | { | |
658 | base = 16; | |
659 | len--; | |
660 | } | |
661 | else if(p[len-1] == 'C' || p[len-1] == 'B') | |
662 | { | |
663 | base = 8; | |
664 | ischar = p[len-1] == 'C'; | |
665 | len--; | |
666 | } | |
667 | ||
668 | /* Scan the number */ | |
669 | for (c = 0; c < len; c++) | |
670 | { | |
671 | if (p[c] == '.' && base == 10) | |
672 | { | |
673 | /* It's a float since it contains a point. */ | |
674 | yylval.dval = atof (p); | |
675 | lexptr += len; | |
676 | return FLOAT; | |
677 | } | |
678 | if (p[c] == '.' && base != 10) | |
679 | error("Floating point numbers must be base 10."); | |
680 | if (base == 10 && (p[c] < '0' || p[c] > '9')) | |
681 | error("Invalid digit \'%c\' in number.",p[c]); | |
682 | } | |
683 | ||
684 | while (len-- > 0) | |
685 | { | |
686 | c = *p++; | |
687 | n *= base; | |
688 | if( base == 8 && (c == '8' || c == '9')) | |
689 | error("Invalid digit \'%c\' in octal number.",c); | |
690 | if (c >= '0' && c <= '9') | |
691 | i = c - '0'; | |
692 | else | |
693 | { | |
694 | if (base == 16 && c >= 'A' && c <= 'F') | |
695 | i = c - 'A' + 10; | |
696 | else | |
697 | return ERROR; | |
698 | } | |
699 | n+=i; | |
700 | if(i >= base) | |
701 | return ERROR; | |
702 | if(!unsigned_p && number_sign == 1 && (prevn >= n)) | |
703 | unsigned_p=1; /* Try something unsigned */ | |
704 | /* Don't do the range check if n==i and i==0, since that special | |
705 | case will give an overflow error. */ | |
706 | if(RANGE_CHECK && n!=i && i) | |
707 | { | |
708 | if((unsigned_p && (unsigned)prevn >= (unsigned)n) || | |
709 | ((!unsigned_p && number_sign==-1) && -prevn <= -n)) | |
710 | range_error("Overflow on numeric constant."); | |
711 | } | |
712 | prevn=n; | |
713 | } | |
714 | ||
715 | lexptr = p; | |
716 | if(*p == 'B' || *p == 'C' || *p == 'H') | |
717 | lexptr++; /* Advance past B,C or H */ | |
718 | ||
719 | if (ischar) | |
720 | { | |
721 | yylval.ulval = n; | |
722 | return CHAR; | |
723 | } | |
724 | else if ( unsigned_p && number_sign == 1) | |
725 | { | |
726 | yylval.ulval = n; | |
727 | return UINT; | |
728 | } | |
729 | else if((unsigned_p && (n<0))) | |
730 | range_error("Overflow on numeric constant -- number too large."); | |
731 | else | |
732 | { | |
733 | yylval.lval = n; | |
734 | return INT; | |
735 | } | |
736 | } | |
737 | ||
738 | ||
739 | /* Some tokens */ | |
740 | ||
741 | static struct | |
742 | { | |
743 | char name[2]; | |
744 | int token; | |
745 | } tokentab2[] = | |
746 | { | |
747 | {"<>", NOTEQUAL }, | |
748 | {":=", ASSIGN }, | |
749 | {"<=", LEQ }, | |
750 | {">=", GEQ }, | |
751 | {"::", COLONCOLON }, | |
752 | ||
753 | }; | |
754 | ||
755 | /* Some specific keywords */ | |
756 | ||
757 | struct keyword { | |
758 | char keyw[10]; | |
759 | int token; | |
760 | }; | |
761 | ||
762 | static struct keyword keytab[] = | |
763 | { | |
764 | {"OR" , OR }, | |
765 | {"IN", IN },/* Note space after IN */ | |
766 | {"AND", AND }, | |
767 | {"ABS", ABS }, | |
768 | {"CHR", CHR }, | |
769 | {"DEC", DEC }, | |
770 | {"NOT", NOT }, | |
771 | {"DIV", DIV }, | |
772 | {"INC", INC }, | |
773 | {"MAX", MAX }, | |
774 | {"MIN", MIN }, | |
775 | {"MOD", MOD }, | |
776 | {"ODD", ODD }, | |
777 | {"CAP", CAP }, | |
778 | {"ORD", ORD }, | |
779 | {"VAL", VAL }, | |
780 | {"EXCL", EXCL }, | |
781 | {"HIGH", HIGH }, | |
782 | {"INCL", INCL }, | |
783 | {"SIZE", SIZE }, | |
784 | {"FLOAT", FLOAT_FUNC }, | |
785 | {"TRUNC", TRUNC }, | |
786 | }; | |
787 | ||
788 | ||
789 | /* Read one token, getting characters through lexptr. */ | |
790 | ||
791 | /* This is where we will check to make sure that the language and the operators used are | |
792 | compatible */ | |
793 | ||
794 | static int | |
795 | yylex () | |
796 | { | |
797 | register int c; | |
798 | register int namelen; | |
799 | register int i; | |
800 | register char *tokstart; | |
801 | register char quote; | |
802 | ||
803 | retry: | |
804 | ||
805 | tokstart = lexptr; | |
806 | ||
807 | ||
808 | /* See if it is a special token of length 2 */ | |
809 | for( i = 0 ; i < sizeof tokentab2 / sizeof tokentab2[0] ; i++) | |
810 | if(!strncmp(tokentab2[i].name, tokstart, 2)) | |
811 | { | |
812 | lexptr += 2; | |
813 | return tokentab2[i].token; | |
814 | } | |
815 | ||
816 | switch (c = *tokstart) | |
817 | { | |
818 | case 0: | |
819 | return 0; | |
820 | ||
821 | case ' ': | |
822 | case '\t': | |
823 | case '\n': | |
824 | lexptr++; | |
825 | goto retry; | |
826 | ||
827 | case '(': | |
828 | paren_depth++; | |
829 | lexptr++; | |
830 | return c; | |
831 | ||
832 | case ')': | |
833 | if (paren_depth == 0) | |
834 | return 0; | |
835 | paren_depth--; | |
836 | lexptr++; | |
837 | return c; | |
838 | ||
839 | case ',': | |
840 | if (comma_terminates && paren_depth == 0) | |
841 | return 0; | |
842 | lexptr++; | |
843 | return c; | |
844 | ||
845 | case '.': | |
846 | /* Might be a floating point number. */ | |
847 | if (lexptr[1] >= '0' && lexptr[1] <= '9') | |
848 | break; /* Falls into number code. */ | |
849 | else | |
850 | { | |
851 | lexptr++; | |
852 | return DOT; | |
853 | } | |
854 | ||
855 | /* These are character tokens that appear as-is in the YACC grammar */ | |
856 | case '+': | |
857 | case '-': | |
858 | case '*': | |
859 | case '/': | |
860 | case '^': | |
861 | case '<': | |
862 | case '>': | |
863 | case '[': | |
864 | case ']': | |
865 | case '=': | |
866 | case '{': | |
867 | case '}': | |
868 | case '#': | |
869 | case '@': | |
870 | case '~': | |
871 | case '&': | |
872 | lexptr++; | |
873 | return c; | |
874 | ||
875 | case '\'' : | |
876 | case '"': | |
877 | quote = c; | |
878 | for (namelen = 1; (c = tokstart[namelen]) != quote && c != '\0'; namelen++) | |
879 | if (c == '\\') | |
880 | { | |
881 | c = tokstart[++namelen]; | |
882 | if (c >= '0' && c <= '9') | |
883 | { | |
884 | c = tokstart[++namelen]; | |
885 | if (c >= '0' && c <= '9') | |
886 | c = tokstart[++namelen]; | |
887 | } | |
888 | } | |
889 | if(c != quote) | |
890 | error("Unterminated string or character constant."); | |
891 | yylval.sval.ptr = tokstart + 1; | |
892 | yylval.sval.length = namelen - 1; | |
893 | lexptr += namelen + 1; | |
894 | ||
895 | if(namelen == 2) /* Single character */ | |
896 | { | |
897 | yylval.ulval = tokstart[1]; | |
898 | return CHAR; | |
899 | } | |
900 | else | |
901 | return STRING; | |
902 | } | |
903 | ||
904 | /* Is it a number? */ | |
905 | /* Note: We have already dealt with the case of the token '.'. | |
906 | See case '.' above. */ | |
907 | if ((c >= '0' && c <= '9')) | |
908 | { | |
909 | /* It's a number. */ | |
910 | int got_dot = 0, got_e = 0; | |
911 | register char *p = tokstart; | |
912 | int toktype; | |
913 | ||
914 | for (++p ;; ++p) | |
915 | { | |
916 | if (!got_e && (*p == 'e' || *p == 'E')) | |
917 | got_dot = got_e = 1; | |
918 | else if (!got_dot && *p == '.') | |
919 | got_dot = 1; | |
920 | else if (got_e && (p[-1] == 'e' || p[-1] == 'E') | |
921 | && (*p == '-' || *p == '+')) | |
922 | /* This is the sign of the exponent, not the end of the | |
923 | number. */ | |
924 | continue; | |
925 | else if ((*p < '0' || *p > '9') && | |
926 | (*p < 'A' || *p > 'F') && | |
927 | (*p != 'H')) /* Modula-2 hexadecimal number */ | |
928 | break; | |
929 | } | |
930 | toktype = parse_number (p - tokstart); | |
931 | if (toktype == ERROR) | |
932 | { | |
933 | char *err_copy = (char *) alloca (p - tokstart + 1); | |
934 | ||
935 | bcopy (tokstart, err_copy, p - tokstart); | |
936 | err_copy[p - tokstart] = 0; | |
937 | error ("Invalid number \"%s\".", err_copy); | |
938 | } | |
939 | lexptr = p; | |
940 | return toktype; | |
941 | } | |
942 | ||
943 | if (!(c == '_' || c == '$' | |
944 | || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))) | |
945 | /* We must have come across a bad character (e.g. ';'). */ | |
946 | error ("Invalid character '%c' in expression.", c); | |
947 | ||
948 | /* It's a name. See how long it is. */ | |
949 | namelen = 0; | |
950 | for (c = tokstart[namelen]; | |
951 | (c == '_' || c == '$' || (c >= '0' && c <= '9') | |
952 | || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')); | |
953 | c = tokstart[++namelen]) | |
954 | ; | |
955 | ||
956 | /* The token "if" terminates the expression and is NOT | |
957 | removed from the input stream. */ | |
958 | if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f') | |
959 | { | |
960 | return 0; | |
961 | } | |
962 | ||
963 | lexptr += namelen; | |
964 | ||
965 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) | |
966 | and $$digits (equivalent to $<-digits> if you could type that). | |
967 | Make token type LAST, and put the number (the digits) in yylval. */ | |
968 | ||
969 | if (*tokstart == '$') | |
970 | { | |
971 | register int negate = 0; | |
972 | c = 1; | |
973 | /* Double dollar means negate the number and add -1 as well. | |
974 | Thus $$ alone means -1. */ | |
975 | if (namelen >= 2 && tokstart[1] == '$') | |
976 | { | |
977 | negate = 1; | |
978 | c = 2; | |
979 | } | |
980 | if (c == namelen) | |
981 | { | |
982 | /* Just dollars (one or two) */ | |
983 | yylval.lval = - negate; | |
984 | return LAST; | |
985 | } | |
986 | /* Is the rest of the token digits? */ | |
987 | for (; c < namelen; c++) | |
988 | if (!(tokstart[c] >= '0' && tokstart[c] <= '9')) | |
989 | break; | |
990 | if (c == namelen) | |
991 | { | |
992 | yylval.lval = atoi (tokstart + 1 + negate); | |
993 | if (negate) | |
994 | yylval.lval = - yylval.lval; | |
995 | return LAST; | |
996 | } | |
997 | } | |
998 | ||
999 | /* Handle tokens that refer to machine registers: | |
1000 | $ followed by a register name. */ | |
1001 | ||
1002 | if (*tokstart == '$') { | |
1003 | for (c = 0; c < NUM_REGS; c++) | |
1004 | if (namelen - 1 == strlen (reg_names[c]) | |
1005 | && !strncmp (tokstart + 1, reg_names[c], namelen - 1)) | |
1006 | { | |
1007 | yylval.lval = c; | |
1008 | return REGNAME; | |
1009 | } | |
1010 | for (c = 0; c < num_std_regs; c++) | |
1011 | if (namelen - 1 == strlen (std_regs[c].name) | |
1012 | && !strncmp (tokstart + 1, std_regs[c].name, namelen - 1)) | |
1013 | { | |
1014 | yylval.lval = std_regs[c].regnum; | |
1015 | return REGNAME; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | ||
1020 | /* Lookup special keywords */ | |
1021 | for(i = 0 ; i < sizeof(keytab) / sizeof(keytab[0]) ; i++) | |
1022 | if(namelen == strlen(keytab[i].keyw) && !strncmp(tokstart,keytab[i].keyw,namelen)) | |
1023 | return keytab[i].token; | |
1024 | ||
1025 | yylval.sval.ptr = tokstart; | |
1026 | yylval.sval.length = namelen; | |
1027 | ||
1028 | /* Any other names starting in $ are debugger internal variables. */ | |
1029 | ||
1030 | if (*tokstart == '$') | |
1031 | { | |
1032 | yylval.ivar = (struct internalvar *) lookup_internalvar (copy_name (yylval.sval) + 1); | |
1033 | return INTERNAL_VAR; | |
1034 | } | |
1035 | ||
1036 | ||
1037 | /* Use token-type BLOCKNAME for symbols that happen to be defined as | |
1038 | functions. If this is not so, then ... | |
1039 | Use token-type TYPENAME for symbols that happen to be defined | |
1040 | currently as names of types; NAME for other symbols. | |
1041 | The caller is not constrained to care about the distinction. */ | |
1042 | { | |
1043 | ||
1044 | ||
1045 | char *tmp = copy_name (yylval.sval); | |
1046 | struct symbol *sym; | |
1047 | ||
1048 | if (lookup_partial_symtab (tmp)) | |
1049 | return BLOCKNAME; | |
1050 | sym = lookup_symbol (tmp, expression_context_block, | |
1051 | VAR_NAMESPACE, 0, NULL); | |
1052 | if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK) | |
1053 | return BLOCKNAME; | |
1054 | if (lookup_typename (copy_name (yylval.sval), expression_context_block, 1)) | |
1055 | return TYPENAME; | |
1056 | ||
1057 | if(sym) | |
1058 | { | |
1059 | switch(sym->class) | |
1060 | { | |
1061 | case LOC_STATIC: | |
1062 | case LOC_REGISTER: | |
1063 | case LOC_ARG: | |
1064 | case LOC_REF_ARG: | |
1065 | case LOC_REGPARM: | |
1066 | case LOC_LOCAL: | |
1067 | case LOC_LOCAL_ARG: | |
1068 | case LOC_CONST: | |
1069 | case LOC_CONST_BYTES: | |
1070 | return NAME; | |
1071 | ||
1072 | case LOC_TYPEDEF: | |
1073 | return TYPENAME; | |
1074 | ||
1075 | case LOC_BLOCK: | |
1076 | return BLOCKNAME; | |
1077 | ||
1078 | case LOC_UNDEF: | |
1079 | error("internal: Undefined class in m2lex()"); | |
1080 | ||
1081 | case LOC_LABEL: | |
1082 | error("internal: Unforseen case in m2lex()"); | |
1083 | } | |
1084 | } | |
1085 | else | |
1086 | { | |
1087 | /* Built-in BOOLEAN type. This is sort of a hack. */ | |
1088 | if(!strncmp(tokstart,"TRUE",4)) | |
1089 | { | |
1090 | yylval.ulval = 1; | |
1091 | return TRUE; | |
1092 | } | |
1093 | else if(!strncmp(tokstart,"FALSE",5)) | |
1094 | { | |
1095 | yylval.ulval = 0; | |
1096 | return FALSE; | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | /* Must be another type of name... */ | |
1101 | return NAME; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | char * | |
1106 | make_qualname(mod,ident) | |
1107 | char *mod, *ident; | |
1108 | { | |
1109 | char *new = xmalloc(strlen(mod)+strlen(ident)+2); | |
1110 | ||
1111 | strcpy(new,mod); | |
1112 | strcat(new,"."); | |
1113 | strcat(new,ident); | |
1114 | return new; | |
1115 | } | |
1116 | ||
1117 | ||
1118 | void | |
1119 | yyerror() | |
1120 | { | |
1121 | printf("Parsing: %s\n",lexptr); | |
1122 | if (yychar < 256) | |
1123 | error("Invalid syntax in expression near character '%c'.",yychar); | |
1124 | else | |
1125 | error("Invalid syntax in expression near a '%s'.", | |
1126 | yytname[yychar-255]); | |
1127 | } | |
1128 | \f | |
1129 | /* Table of operators and their precedences for printing expressions. */ | |
1130 | ||
1131 | const static struct op_print m2_op_print_tab[] = { | |
1132 | {"+", BINOP_ADD, PREC_ADD, 0}, | |
1133 | {"+", UNOP_PLUS, PREC_PREFIX, 0}, | |
1134 | {"-", BINOP_SUB, PREC_ADD, 0}, | |
1135 | {"-", UNOP_NEG, PREC_PREFIX, 0}, | |
1136 | {"*", BINOP_MUL, PREC_MUL, 0}, | |
1137 | {"/", BINOP_DIV, PREC_MUL, 0}, | |
1138 | {"DIV", BINOP_INTDIV, PREC_MUL, 0}, | |
1139 | {"MOD", BINOP_REM, PREC_MUL, 0}, | |
1140 | {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, | |
1141 | {"OR", BINOP_OR, PREC_OR, 0}, | |
1142 | {"AND", BINOP_AND, PREC_AND, 0}, | |
1143 | {"NOT", UNOP_ZEROP, PREC_PREFIX, 0}, | |
1144 | {"=", BINOP_EQUAL, PREC_EQUAL, 0}, | |
1145 | {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, | |
1146 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, | |
1147 | {">=", BINOP_GEQ, PREC_ORDER, 0}, | |
1148 | {">", BINOP_GTR, PREC_ORDER, 0}, | |
1149 | {"<", BINOP_LESS, PREC_ORDER, 0}, | |
1150 | {"^", UNOP_IND, PREC_PREFIX, 0}, | |
1151 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, | |
1152 | }; | |
1153 | \f | |
1154 | /* The built-in types of Modula-2. */ | |
1155 | ||
1156 | struct type *builtin_type_m2_char; | |
1157 | struct type *builtin_type_m2_int; | |
1158 | struct type *builtin_type_m2_card; | |
1159 | struct type *builtin_type_m2_real; | |
1160 | struct type *builtin_type_m2_bool; | |
1161 | ||
1162 | struct type **(m2_builtin_types[]) = | |
1163 | { | |
1164 | &builtin_type_m2_char, | |
1165 | &builtin_type_m2_int, | |
1166 | &builtin_type_m2_card, | |
1167 | &builtin_type_m2_real, | |
1168 | &builtin_type_m2_bool, | |
1169 | 0 | |
1170 | }; | |
1171 | ||
1172 | struct language_defn m2_language_defn = { | |
1173 | "modula-2", | |
1174 | language_m2, | |
1175 | &m2_builtin_types[0], | |
1176 | range_check_on, | |
1177 | type_check_on, | |
1178 | m2_parse, /* parser */ | |
1179 | m2_error, /* parser error function */ | |
1180 | &builtin_type_m2_int, /* longest signed integral type */ | |
1181 | &builtin_type_m2_card, /* longest unsigned integral type */ | |
1182 | &builtin_type_m2_real, /* longest floating point type */ | |
1183 | "0%XH", "0%", "XH", /* Hex format string, prefix, suffix */ | |
1184 | "%oB", "%", "oB", /* Octal format string, prefix, suffix */ | |
1185 | m2_op_print_tab, /* expression operators for printing */ | |
1186 | LANG_MAGIC | |
1187 | }; | |
1188 | ||
1189 | /* Initialization for Modula-2 */ | |
1190 | ||
1191 | void | |
1192 | _initialize_m2_exp () | |
1193 | { | |
1194 | /* FIXME: The code below assumes that the sizes of the basic data | |
1195 | types are the same on the host and target machines!!! */ | |
1196 | ||
1197 | /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */ | |
1198 | builtin_type_m2_int = init_type (TYPE_CODE_INT, sizeof(int), 0, "INTEGER"); | |
1199 | builtin_type_m2_card = init_type (TYPE_CODE_INT, sizeof(int), 1, "CARDINAL"); | |
1200 | builtin_type_m2_real = init_type (TYPE_CODE_FLT, sizeof(float), 0, "REAL"); | |
1201 | builtin_type_m2_char = init_type (TYPE_CODE_CHAR, sizeof(char), 1, "CHAR"); | |
1202 | ||
1203 | builtin_type_m2_bool = init_type (TYPE_CODE_BOOL, sizeof(int), 1, "BOOLEAN"); | |
1204 | TYPE_NFIELDS(builtin_type_m2_bool) = 2; | |
1205 | TYPE_FIELDS(builtin_type_m2_bool) = | |
1206 | (struct field *) malloc (sizeof (struct field) * 2); | |
1207 | TYPE_FIELD_BITPOS(builtin_type_m2_bool,0) = 0; | |
1208 | TYPE_FIELD_NAME(builtin_type_m2_bool,0) = (char *)malloc(6); | |
1209 | strcpy(TYPE_FIELD_NAME(builtin_type_m2_bool,0),"FALSE"); | |
1210 | TYPE_FIELD_BITPOS(builtin_type_m2_bool,1) = 1; | |
1211 | TYPE_FIELD_NAME(builtin_type_m2_bool,1) = (char *)malloc(5); | |
1212 | strcpy(TYPE_FIELD_NAME(builtin_type_m2_bool,1),"TRUE"); | |
1213 | ||
1214 | add_language (&m2_language_defn); | |
1215 | } |