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c906108c | 1 | /* Modula 2 language support routines for GDB, the GNU debugger. |
ce27fb25 | 2 | |
b811d2c2 | 3 | Copyright (C) 1992-2020 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
19 | |
20 | #include "defs.h" | |
21 | #include "symtab.h" | |
22 | #include "gdbtypes.h" | |
23 | #include "expression.h" | |
24 | #include "parser-defs.h" | |
25 | #include "language.h" | |
a53b64ea | 26 | #include "varobj.h" |
c906108c SS |
27 | #include "m2-lang.h" |
28 | #include "c-lang.h" | |
745b8ca0 | 29 | #include "valprint.h" |
0d12e84c | 30 | #include "gdbarch.h" |
c906108c | 31 | |
6c7a06a3 | 32 | static void m2_printchar (int, struct type *, struct ui_file *); |
c906108c SS |
33 | |
34 | /* FIXME: This is a copy of the same function from c-exp.y. It should | |
844781a1 | 35 | be replaced with a true Modula version. */ |
c906108c SS |
36 | |
37 | static void | |
6c7a06a3 | 38 | m2_printchar (int c, struct type *type, struct ui_file *stream) |
c906108c SS |
39 | { |
40 | fputs_filtered ("'", stream); | |
6c7a06a3 | 41 | LA_EMIT_CHAR (c, type, stream, '\''); |
c906108c SS |
42 | fputs_filtered ("'", stream); |
43 | } | |
44 | ||
844781a1 GM |
45 | static struct value * |
46 | evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp, | |
47 | int *pos, enum noside noside) | |
48 | { | |
49 | enum exp_opcode op = exp->elts[*pos].opcode; | |
50 | struct value *arg1; | |
51 | struct value *arg2; | |
52 | struct type *type; | |
b8d56208 | 53 | |
844781a1 GM |
54 | switch (op) |
55 | { | |
56 | case UNOP_HIGH: | |
57 | (*pos)++; | |
58 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); | |
59 | ||
60 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) | |
61 | return arg1; | |
62 | else | |
63 | { | |
64 | arg1 = coerce_ref (arg1); | |
65 | type = check_typedef (value_type (arg1)); | |
66 | ||
67 | if (m2_is_unbounded_array (type)) | |
68 | { | |
69 | struct value *temp = arg1; | |
b8d56208 | 70 | |
940da03e | 71 | type = type->field (1).type (); |
844781a1 GM |
72 | /* i18n: Do not translate the "_m2_high" part! */ |
73 | arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL, | |
74 | _("unbounded structure " | |
75 | "missing _m2_high field")); | |
76 | ||
77 | if (value_type (arg1) != type) | |
78 | arg1 = value_cast (type, arg1); | |
79 | } | |
80 | } | |
81 | return arg1; | |
82 | ||
83 | case BINOP_SUBSCRIPT: | |
84 | (*pos)++; | |
85 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); | |
86 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); | |
87 | if (noside == EVAL_SKIP) | |
88 | goto nosideret; | |
89 | /* If the user attempts to subscript something that is not an | |
90 | array or pointer type (like a plain int variable for example), | |
91 | then report this as an error. */ | |
92 | ||
93 | arg1 = coerce_ref (arg1); | |
94 | type = check_typedef (value_type (arg1)); | |
95 | ||
96 | if (m2_is_unbounded_array (type)) | |
97 | { | |
98 | struct value *temp = arg1; | |
940da03e | 99 | type = type->field (0).type (); |
78134374 | 100 | if (type == NULL || (type->code () != TYPE_CODE_PTR)) |
b8d56208 | 101 | { |
025bb325 MS |
102 | warning (_("internal error: unbounded " |
103 | "array structure is unknown")); | |
b8d56208 MS |
104 | return evaluate_subexp_standard (expect_type, exp, pos, noside); |
105 | } | |
844781a1 GM |
106 | /* i18n: Do not translate the "_m2_contents" part! */ |
107 | arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL, | |
108 | _("unbounded structure " | |
109 | "missing _m2_contents field")); | |
110 | ||
111 | if (value_type (arg1) != type) | |
112 | arg1 = value_cast (type, arg1); | |
113 | ||
976aa66e | 114 | check_typedef (value_type (arg1)); |
2497b498 | 115 | return value_ind (value_ptradd (arg1, value_as_long (arg2))); |
844781a1 GM |
116 | } |
117 | else | |
78134374 | 118 | if (type->code () != TYPE_CODE_ARRAY) |
844781a1 | 119 | { |
7d93a1e0 | 120 | if (type->name ()) |
844781a1 | 121 | error (_("cannot subscript something of type `%s'"), |
7d93a1e0 | 122 | type->name ()); |
844781a1 GM |
123 | else |
124 | error (_("cannot subscript requested type")); | |
125 | } | |
126 | ||
127 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
128 | return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1)); | |
129 | else | |
2497b498 | 130 | return value_subscript (arg1, value_as_long (arg2)); |
844781a1 GM |
131 | |
132 | default: | |
133 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
134 | } | |
135 | ||
136 | nosideret: | |
22601c15 | 137 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); |
844781a1 | 138 | } |
c906108c | 139 | \f |
c5aa993b | 140 | |
c906108c SS |
141 | /* Table of operators and their precedences for printing expressions. */ |
142 | ||
c5aa993b JM |
143 | static const struct op_print m2_op_print_tab[] = |
144 | { | |
145 | {"+", BINOP_ADD, PREC_ADD, 0}, | |
146 | {"+", UNOP_PLUS, PREC_PREFIX, 0}, | |
147 | {"-", BINOP_SUB, PREC_ADD, 0}, | |
148 | {"-", UNOP_NEG, PREC_PREFIX, 0}, | |
149 | {"*", BINOP_MUL, PREC_MUL, 0}, | |
150 | {"/", BINOP_DIV, PREC_MUL, 0}, | |
151 | {"DIV", BINOP_INTDIV, PREC_MUL, 0}, | |
152 | {"MOD", BINOP_REM, PREC_MUL, 0}, | |
153 | {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, | |
154 | {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, | |
155 | {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, | |
156 | {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, | |
157 | {"=", BINOP_EQUAL, PREC_EQUAL, 0}, | |
158 | {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, | |
159 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, | |
160 | {">=", BINOP_GEQ, PREC_ORDER, 0}, | |
161 | {">", BINOP_GTR, PREC_ORDER, 0}, | |
162 | {"<", BINOP_LESS, PREC_ORDER, 0}, | |
163 | {"^", UNOP_IND, PREC_PREFIX, 0}, | |
164 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, | |
165 | {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0}, | |
166 | {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0}, | |
167 | {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0}, | |
168 | {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0}, | |
169 | {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0}, | |
170 | {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0}, | |
171 | {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0}, | |
172 | {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0}, | |
173 | {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0}, | |
f486487f | 174 | {NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0} |
c906108c SS |
175 | }; |
176 | \f | |
177 | /* The built-in types of Modula-2. */ | |
178 | ||
cad351d1 UW |
179 | enum m2_primitive_types { |
180 | m2_primitive_type_char, | |
181 | m2_primitive_type_int, | |
182 | m2_primitive_type_card, | |
183 | m2_primitive_type_real, | |
184 | m2_primitive_type_bool, | |
185 | nr_m2_primitive_types | |
c906108c SS |
186 | }; |
187 | ||
844781a1 GM |
188 | const struct exp_descriptor exp_descriptor_modula2 = |
189 | { | |
190 | print_subexp_standard, | |
191 | operator_length_standard, | |
c0201579 | 192 | operator_check_standard, |
844781a1 GM |
193 | op_name_standard, |
194 | dump_subexp_body_standard, | |
195 | evaluate_subexp_modula2 | |
196 | }; | |
197 | ||
0874fd07 AB |
198 | /* Constant data describing the M2 language. */ |
199 | ||
200 | extern const struct language_data m2_language_data = | |
c5aa993b | 201 | { |
c906108c | 202 | "modula-2", |
6abde28f | 203 | "Modula-2", |
c906108c | 204 | language_m2, |
c906108c | 205 | range_check_on, |
63872f9d | 206 | case_sensitive_on, |
7ca2d3a3 | 207 | array_row_major, |
9a044a89 | 208 | macro_expansion_no, |
56618e20 | 209 | NULL, |
844781a1 | 210 | &exp_descriptor_modula2, |
2b2d9e11 | 211 | NULL, /* name_of_this */ |
59cc4834 | 212 | false, /* la_store_sym_names_in_linkage_form_p */ |
c906108c SS |
213 | m2_op_print_tab, /* expression operators for printing */ |
214 | 0, /* arrays are first-class (not c-style) */ | |
215 | 0, /* String lower bound */ | |
a53b64ea | 216 | &default_varobj_ops, |
721b08c6 | 217 | "{...}" /* la_struct_too_deep_ellipsis */ |
c906108c SS |
218 | }; |
219 | ||
0874fd07 AB |
220 | /* Class representing the M2 language. */ |
221 | ||
222 | class m2_language : public language_defn | |
223 | { | |
224 | public: | |
225 | m2_language () | |
226 | : language_defn (language_m2, m2_language_data) | |
227 | { /* Nothing. */ } | |
1fb314aa AB |
228 | |
229 | /* See language.h. */ | |
230 | void language_arch_info (struct gdbarch *gdbarch, | |
231 | struct language_arch_info *lai) const override | |
232 | { | |
233 | const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch); | |
234 | ||
235 | lai->string_char_type = builtin->builtin_char; | |
236 | lai->primitive_type_vector | |
237 | = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1, | |
238 | struct type *); | |
239 | ||
240 | lai->primitive_type_vector [m2_primitive_type_char] | |
241 | = builtin->builtin_char; | |
242 | lai->primitive_type_vector [m2_primitive_type_int] | |
243 | = builtin->builtin_int; | |
244 | lai->primitive_type_vector [m2_primitive_type_card] | |
245 | = builtin->builtin_card; | |
246 | lai->primitive_type_vector [m2_primitive_type_real] | |
247 | = builtin->builtin_real; | |
248 | lai->primitive_type_vector [m2_primitive_type_bool] | |
249 | = builtin->builtin_bool; | |
250 | ||
251 | lai->bool_type_symbol = "BOOLEAN"; | |
252 | lai->bool_type_default = builtin->builtin_bool; | |
253 | } | |
fbfb0a46 AB |
254 | |
255 | /* See language.h. */ | |
256 | ||
257 | void print_type (struct type *type, const char *varstring, | |
258 | struct ui_file *stream, int show, int level, | |
259 | const struct type_print_options *flags) const override | |
260 | { | |
261 | m2_print_type (type, varstring, stream, show, level, flags); | |
262 | } | |
ebe2334e AB |
263 | |
264 | /* See language.h. */ | |
265 | ||
266 | void value_print_inner | |
267 | (struct value *val, struct ui_file *stream, int recurse, | |
268 | const struct value_print_options *options) const override | |
269 | { | |
270 | return m2_value_print_inner (val, stream, recurse, options); | |
271 | } | |
87afa652 AB |
272 | |
273 | /* See language.h. */ | |
274 | ||
275 | int parser (struct parser_state *ps) const override | |
276 | { | |
277 | return m2_parse (ps); | |
278 | } | |
ec8cec5b AB |
279 | |
280 | /* See language.h. */ | |
281 | ||
282 | void emitchar (int ch, struct type *chtype, | |
283 | struct ui_file *stream, int quoter) const override | |
284 | { | |
285 | ch &= 0xFF; /* Avoid sign bit follies. */ | |
286 | ||
287 | if (PRINT_LITERAL_FORM (ch)) | |
288 | { | |
289 | if (ch == '\\' || ch == quoter) | |
290 | fputs_filtered ("\\", stream); | |
291 | fprintf_filtered (stream, "%c", ch); | |
292 | } | |
293 | else | |
294 | { | |
295 | switch (ch) | |
296 | { | |
297 | case '\n': | |
298 | fputs_filtered ("\\n", stream); | |
299 | break; | |
300 | case '\b': | |
301 | fputs_filtered ("\\b", stream); | |
302 | break; | |
303 | case '\t': | |
304 | fputs_filtered ("\\t", stream); | |
305 | break; | |
306 | case '\f': | |
307 | fputs_filtered ("\\f", stream); | |
308 | break; | |
309 | case '\r': | |
310 | fputs_filtered ("\\r", stream); | |
311 | break; | |
312 | case '\033': | |
313 | fputs_filtered ("\\e", stream); | |
314 | break; | |
315 | case '\007': | |
316 | fputs_filtered ("\\a", stream); | |
317 | break; | |
318 | default: | |
319 | fprintf_filtered (stream, "\\%.3o", (unsigned int) ch); | |
320 | break; | |
321 | } | |
322 | } | |
323 | } | |
52b50f2c AB |
324 | |
325 | /* See language.h. */ | |
326 | ||
327 | void printchar (int ch, struct type *chtype, | |
328 | struct ui_file *stream) const override | |
329 | { | |
330 | m2_printchar (ch, chtype, stream); | |
331 | } | |
d711ee67 AB |
332 | |
333 | /* See language.h. */ | |
334 | ||
335 | void printstr (struct ui_file *stream, struct type *elttype, | |
336 | const gdb_byte *string, unsigned int length, | |
337 | const char *encoding, int force_ellipses, | |
338 | const struct value_print_options *options) const override | |
339 | { | |
340 | unsigned int i; | |
341 | unsigned int things_printed = 0; | |
342 | int in_quotes = 0; | |
343 | int need_comma = 0; | |
344 | ||
345 | if (length == 0) | |
346 | { | |
347 | fputs_filtered ("\"\"", gdb_stdout); | |
348 | return; | |
349 | } | |
350 | ||
351 | for (i = 0; i < length && things_printed < options->print_max; ++i) | |
352 | { | |
353 | /* Position of the character we are examining | |
354 | to see whether it is repeated. */ | |
355 | unsigned int rep1; | |
356 | /* Number of repetitions we have detected so far. */ | |
357 | unsigned int reps; | |
358 | ||
359 | QUIT; | |
360 | ||
361 | if (need_comma) | |
362 | { | |
363 | fputs_filtered (", ", stream); | |
364 | need_comma = 0; | |
365 | } | |
366 | ||
367 | rep1 = i + 1; | |
368 | reps = 1; | |
369 | while (rep1 < length && string[rep1] == string[i]) | |
370 | { | |
371 | ++rep1; | |
372 | ++reps; | |
373 | } | |
374 | ||
375 | if (reps > options->repeat_count_threshold) | |
376 | { | |
377 | if (in_quotes) | |
378 | { | |
379 | fputs_filtered ("\", ", stream); | |
380 | in_quotes = 0; | |
381 | } | |
382 | m2_printchar (string[i], elttype, stream); | |
383 | fprintf_filtered (stream, " <repeats %u times>", reps); | |
384 | i = rep1 - 1; | |
385 | things_printed += options->repeat_count_threshold; | |
386 | need_comma = 1; | |
387 | } | |
388 | else | |
389 | { | |
390 | if (!in_quotes) | |
391 | { | |
392 | fputs_filtered ("\"", stream); | |
393 | in_quotes = 1; | |
394 | } | |
395 | LA_EMIT_CHAR (string[i], elttype, stream, '"'); | |
396 | ++things_printed; | |
397 | } | |
398 | } | |
399 | ||
400 | /* Terminate the quotes if necessary. */ | |
401 | if (in_quotes) | |
402 | fputs_filtered ("\"", stream); | |
403 | ||
404 | if (force_ellipses || i < length) | |
405 | fputs_filtered ("...", stream); | |
406 | } | |
4ffc13fb AB |
407 | |
408 | /* See language.h. */ | |
409 | ||
410 | void print_typedef (struct type *type, struct symbol *new_symbol, | |
411 | struct ui_file *stream) const override | |
412 | { | |
413 | m2_print_typedef (type, new_symbol, stream); | |
414 | } | |
415 | ||
39e7ecca AB |
416 | /* See language.h. */ |
417 | ||
418 | bool is_string_type_p (struct type *type) const override | |
419 | { | |
420 | type = check_typedef (type); | |
421 | if (type->code () == TYPE_CODE_ARRAY | |
422 | && TYPE_LENGTH (type) > 0 | |
423 | && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0) | |
424 | { | |
425 | struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type)); | |
426 | ||
427 | if (TYPE_LENGTH (elttype) == 1 | |
428 | && (elttype->code () == TYPE_CODE_INT | |
429 | || elttype->code () == TYPE_CODE_CHAR)) | |
430 | return true; | |
431 | } | |
432 | ||
433 | return false; | |
434 | } | |
0874fd07 AB |
435 | }; |
436 | ||
437 | /* Single instance of the M2 language. */ | |
438 | ||
439 | static m2_language m2_language_defn; | |
440 | ||
5760b90a UW |
441 | static void * |
442 | build_m2_types (struct gdbarch *gdbarch) | |
c906108c | 443 | { |
5760b90a UW |
444 | struct builtin_m2_type *builtin_m2_type |
445 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type); | |
446 | ||
c906108c | 447 | /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */ |
e9bb382b UW |
448 | builtin_m2_type->builtin_int |
449 | = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER"); | |
450 | builtin_m2_type->builtin_card | |
451 | = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL"); | |
452 | builtin_m2_type->builtin_real | |
49f190bc UW |
453 | = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL", |
454 | gdbarch_float_format (gdbarch)); | |
e9bb382b UW |
455 | builtin_m2_type->builtin_char |
456 | = arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR"); | |
457 | builtin_m2_type->builtin_bool | |
458 | = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN"); | |
c906108c | 459 | |
5760b90a UW |
460 | return builtin_m2_type; |
461 | } | |
462 | ||
463 | static struct gdbarch_data *m2_type_data; | |
464 | ||
465 | const struct builtin_m2_type * | |
466 | builtin_m2_type (struct gdbarch *gdbarch) | |
467 | { | |
9a3c8263 | 468 | return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data); |
5760b90a UW |
469 | } |
470 | ||
471 | ||
472 | /* Initialization for Modula-2 */ | |
473 | ||
6c265988 | 474 | void _initialize_m2_language (); |
5760b90a | 475 | void |
6c265988 | 476 | _initialize_m2_language () |
5760b90a UW |
477 | { |
478 | m2_type_data = gdbarch_data_register_post_init (build_m2_types); | |
c906108c | 479 | } |