1 /* Modula 2 language support routines for GDB, the GNU debugger. 2 3 Copyright (C) 1992-2017 Free Software Foundation, Inc. 4 5 This file is part of GDB. 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 3 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. If not, see <http://www.gnu.org/licenses/>. */ 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" 26 #include "varobj.h" 27 #include "m2-lang.h" 28 #include "c-lang.h" 29 #include "valprint.h" 30 31 extern void _initialize_m2_language (void); 32 static void m2_printchar (int, struct type *, struct ui_file *); 33 static void m2_emit_char (int, struct type *, struct ui_file *, int); 34 35 /* Print the character C on STREAM as part of the contents of a literal 36 string whose delimiter is QUOTER. Note that that format for printing 37 characters and strings is language specific. 38 FIXME: This is a copy of the same function from c-exp.y. It should 39 be replaced with a true Modula version. */ 40 41 static void 42 m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter) 43 { 44 45 c &= 0xFF; /* Avoid sign bit follies. */ 46 47 if (PRINT_LITERAL_FORM (c)) 48 { 49 if (c == '\\' || c == quoter) 50 { 51 fputs_filtered ("\\", stream); 52 } 53 fprintf_filtered (stream, "%c", c); 54 } 55 else 56 { 57 switch (c) 58 { 59 case '\n': 60 fputs_filtered ("\\n", stream); 61 break; 62 case '\b': 63 fputs_filtered ("\\b", stream); 64 break; 65 case '\t': 66 fputs_filtered ("\\t", stream); 67 break; 68 case '\f': 69 fputs_filtered ("\\f", stream); 70 break; 71 case '\r': 72 fputs_filtered ("\\r", stream); 73 break; 74 case '\033': 75 fputs_filtered ("\\e", stream); 76 break; 77 case '\007': 78 fputs_filtered ("\\a", stream); 79 break; 80 default: 81 fprintf_filtered (stream, "\\%.3o", (unsigned int) c); 82 break; 83 } 84 } 85 } 86 87 /* FIXME: This is a copy of the same function from c-exp.y. It should 88 be replaced with a true Modula version. */ 89 90 static void 91 m2_printchar (int c, struct type *type, struct ui_file *stream) 92 { 93 fputs_filtered ("'", stream); 94 LA_EMIT_CHAR (c, type, stream, '\''); 95 fputs_filtered ("'", stream); 96 } 97 98 /* Print the character string STRING, printing at most LENGTH characters. 99 Printing stops early if the number hits print_max; repeat counts 100 are printed as appropriate. Print ellipses at the end if we 101 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. 102 FIXME: This is a copy of the same function from c-exp.y. It should 103 be replaced with a true Modula version. */ 104 105 static void 106 m2_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string, 107 unsigned int length, const char *encoding, int force_ellipses, 108 const struct value_print_options *options) 109 { 110 unsigned int i; 111 unsigned int things_printed = 0; 112 int in_quotes = 0; 113 int need_comma = 0; 114 115 if (length == 0) 116 { 117 fputs_filtered ("\"\"", gdb_stdout); 118 return; 119 } 120 121 for (i = 0; i < length && things_printed < options->print_max; ++i) 122 { 123 /* Position of the character we are examining 124 to see whether it is repeated. */ 125 unsigned int rep1; 126 /* Number of repetitions we have detected so far. */ 127 unsigned int reps; 128 129 QUIT; 130 131 if (need_comma) 132 { 133 fputs_filtered (", ", stream); 134 need_comma = 0; 135 } 136 137 rep1 = i + 1; 138 reps = 1; 139 while (rep1 < length && string[rep1] == string[i]) 140 { 141 ++rep1; 142 ++reps; 143 } 144 145 if (reps > options->repeat_count_threshold) 146 { 147 if (in_quotes) 148 { 149 fputs_filtered ("\", ", stream); 150 in_quotes = 0; 151 } 152 m2_printchar (string[i], type, stream); 153 fprintf_filtered (stream, " <repeats %u times>", reps); 154 i = rep1 - 1; 155 things_printed += options->repeat_count_threshold; 156 need_comma = 1; 157 } 158 else 159 { 160 if (!in_quotes) 161 { 162 fputs_filtered ("\"", stream); 163 in_quotes = 1; 164 } 165 LA_EMIT_CHAR (string[i], type, stream, '"'); 166 ++things_printed; 167 } 168 } 169 170 /* Terminate the quotes if necessary. */ 171 if (in_quotes) 172 fputs_filtered ("\"", stream); 173 174 if (force_ellipses || i < length) 175 fputs_filtered ("...", stream); 176 } 177 178 static struct value * 179 evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp, 180 int *pos, enum noside noside) 181 { 182 enum exp_opcode op = exp->elts[*pos].opcode; 183 struct value *arg1; 184 struct value *arg2; 185 struct type *type; 186 187 switch (op) 188 { 189 case UNOP_HIGH: 190 (*pos)++; 191 arg1 = evaluate_subexp_with_coercion (exp, pos, noside); 192 193 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) 194 return arg1; 195 else 196 { 197 arg1 = coerce_ref (arg1); 198 type = check_typedef (value_type (arg1)); 199 200 if (m2_is_unbounded_array (type)) 201 { 202 struct value *temp = arg1; 203 204 type = TYPE_FIELD_TYPE (type, 1); 205 /* i18n: Do not translate the "_m2_high" part! */ 206 arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL, 207 _("unbounded structure " 208 "missing _m2_high field")); 209 210 if (value_type (arg1) != type) 211 arg1 = value_cast (type, arg1); 212 } 213 } 214 return arg1; 215 216 case BINOP_SUBSCRIPT: 217 (*pos)++; 218 arg1 = evaluate_subexp_with_coercion (exp, pos, noside); 219 arg2 = evaluate_subexp_with_coercion (exp, pos, noside); 220 if (noside == EVAL_SKIP) 221 goto nosideret; 222 /* If the user attempts to subscript something that is not an 223 array or pointer type (like a plain int variable for example), 224 then report this as an error. */ 225 226 arg1 = coerce_ref (arg1); 227 type = check_typedef (value_type (arg1)); 228 229 if (m2_is_unbounded_array (type)) 230 { 231 struct value *temp = arg1; 232 type = TYPE_FIELD_TYPE (type, 0); 233 if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR)) 234 { 235 warning (_("internal error: unbounded " 236 "array structure is unknown")); 237 return evaluate_subexp_standard (expect_type, exp, pos, noside); 238 } 239 /* i18n: Do not translate the "_m2_contents" part! */ 240 arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL, 241 _("unbounded structure " 242 "missing _m2_contents field")); 243 244 if (value_type (arg1) != type) 245 arg1 = value_cast (type, arg1); 246 247 check_typedef (value_type (arg1)); 248 return value_ind (value_ptradd (arg1, value_as_long (arg2))); 249 } 250 else 251 if (TYPE_CODE (type) != TYPE_CODE_ARRAY) 252 { 253 if (TYPE_NAME (type)) 254 error (_("cannot subscript something of type `%s'"), 255 TYPE_NAME (type)); 256 else 257 error (_("cannot subscript requested type")); 258 } 259 260 if (noside == EVAL_AVOID_SIDE_EFFECTS) 261 return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1)); 262 else 263 return value_subscript (arg1, value_as_long (arg2)); 264 265 default: 266 return evaluate_subexp_standard (expect_type, exp, pos, noside); 267 } 268 269 nosideret: 270 return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); 271 } 272 273 274 /* Table of operators and their precedences for printing expressions. */ 275 276 static const struct op_print m2_op_print_tab[] = 277 { 278 {"+", BINOP_ADD, PREC_ADD, 0}, 279 {"+", UNOP_PLUS, PREC_PREFIX, 0}, 280 {"-", BINOP_SUB, PREC_ADD, 0}, 281 {"-", UNOP_NEG, PREC_PREFIX, 0}, 282 {"*", BINOP_MUL, PREC_MUL, 0}, 283 {"/", BINOP_DIV, PREC_MUL, 0}, 284 {"DIV", BINOP_INTDIV, PREC_MUL, 0}, 285 {"MOD", BINOP_REM, PREC_MUL, 0}, 286 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, 287 {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, 288 {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, 289 {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, 290 {"=", BINOP_EQUAL, PREC_EQUAL, 0}, 291 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, 292 {"<=", BINOP_LEQ, PREC_ORDER, 0}, 293 {">=", BINOP_GEQ, PREC_ORDER, 0}, 294 {">", BINOP_GTR, PREC_ORDER, 0}, 295 {"<", BINOP_LESS, PREC_ORDER, 0}, 296 {"^", UNOP_IND, PREC_PREFIX, 0}, 297 {"@", BINOP_REPEAT, PREC_REPEAT, 0}, 298 {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0}, 299 {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0}, 300 {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0}, 301 {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0}, 302 {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0}, 303 {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0}, 304 {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0}, 305 {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0}, 306 {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0}, 307 {NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0} 308 }; 309 310 /* The built-in types of Modula-2. */ 311 312 enum m2_primitive_types { 313 m2_primitive_type_char, 314 m2_primitive_type_int, 315 m2_primitive_type_card, 316 m2_primitive_type_real, 317 m2_primitive_type_bool, 318 nr_m2_primitive_types 319 }; 320 321 static void 322 m2_language_arch_info (struct gdbarch *gdbarch, 323 struct language_arch_info *lai) 324 { 325 const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch); 326 327 lai->string_char_type = builtin->builtin_char; 328 lai->primitive_type_vector 329 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1, 330 struct type *); 331 332 lai->primitive_type_vector [m2_primitive_type_char] 333 = builtin->builtin_char; 334 lai->primitive_type_vector [m2_primitive_type_int] 335 = builtin->builtin_int; 336 lai->primitive_type_vector [m2_primitive_type_card] 337 = builtin->builtin_card; 338 lai->primitive_type_vector [m2_primitive_type_real] 339 = builtin->builtin_real; 340 lai->primitive_type_vector [m2_primitive_type_bool] 341 = builtin->builtin_bool; 342 343 lai->bool_type_symbol = "BOOLEAN"; 344 lai->bool_type_default = builtin->builtin_bool; 345 } 346 347 const struct exp_descriptor exp_descriptor_modula2 = 348 { 349 print_subexp_standard, 350 operator_length_standard, 351 operator_check_standard, 352 op_name_standard, 353 dump_subexp_body_standard, 354 evaluate_subexp_modula2 355 }; 356 357 const struct language_defn m2_language_defn = 358 { 359 "modula-2", 360 "Modula-2", 361 language_m2, 362 range_check_on, 363 case_sensitive_on, 364 array_row_major, 365 macro_expansion_no, 366 NULL, 367 &exp_descriptor_modula2, 368 m2_parse, /* parser */ 369 m2_yyerror, /* parser error function */ 370 null_post_parser, 371 m2_printchar, /* Print character constant */ 372 m2_printstr, /* function to print string constant */ 373 m2_emit_char, /* Function to print a single character */ 374 m2_print_type, /* Print a type using appropriate syntax */ 375 m2_print_typedef, /* Print a typedef using appropriate syntax */ 376 m2_val_print, /* Print a value using appropriate syntax */ 377 c_value_print, /* Print a top-level value */ 378 default_read_var_value, /* la_read_var_value */ 379 NULL, /* Language specific skip_trampoline */ 380 NULL, /* name_of_this */ 381 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 382 basic_lookup_transparent_type,/* lookup_transparent_type */ 383 NULL, /* Language specific symbol demangler */ 384 NULL, 385 NULL, /* Language specific 386 class_name_from_physname */ 387 m2_op_print_tab, /* expression operators for printing */ 388 0, /* arrays are first-class (not c-style) */ 389 0, /* String lower bound */ 390 default_word_break_characters, 391 default_make_symbol_completion_list, 392 m2_language_arch_info, 393 default_print_array_index, 394 default_pass_by_reference, 395 default_get_string, 396 NULL, /* la_get_symbol_name_cmp */ 397 iterate_over_symbols, 398 &default_varobj_ops, 399 NULL, 400 NULL, 401 LANG_MAGIC 402 }; 403 404 static void * 405 build_m2_types (struct gdbarch *gdbarch) 406 { 407 struct builtin_m2_type *builtin_m2_type 408 = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type); 409 410 /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */ 411 builtin_m2_type->builtin_int 412 = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER"); 413 builtin_m2_type->builtin_card 414 = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL"); 415 builtin_m2_type->builtin_real 416 = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL", 417 gdbarch_float_format (gdbarch)); 418 builtin_m2_type->builtin_char 419 = arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR"); 420 builtin_m2_type->builtin_bool 421 = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN"); 422 423 return builtin_m2_type; 424 } 425 426 static struct gdbarch_data *m2_type_data; 427 428 const struct builtin_m2_type * 429 builtin_m2_type (struct gdbarch *gdbarch) 430 { 431 return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data); 432 } 433 434 435 /* Initialization for Modula-2 */ 436 437 void 438 _initialize_m2_language (void) 439 { 440 m2_type_data = gdbarch_data_register_post_init (build_m2_types); 441 442 add_language (&m2_language_defn); 443 } 444