1 /* Modula 2 language support routines for GDB, the GNU debugger. 2 3 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2002, 2003, 2004, 4 2005, 2007, 2008, 2009 Free Software Foundation, Inc. 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 3 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, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "symtab.h" 23 #include "gdbtypes.h" 24 #include "expression.h" 25 #include "parser-defs.h" 26 #include "language.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, 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 int width = TYPE_LENGTH (type); 115 116 if (length == 0) 117 { 118 fputs_filtered ("\"\"", gdb_stdout); 119 return; 120 } 121 122 for (i = 0; i < length && things_printed < options->print_max; ++i) 123 { 124 /* Position of the character we are examining 125 to see whether it is repeated. */ 126 unsigned int rep1; 127 /* Number of repetitions we have detected so far. */ 128 unsigned int reps; 129 130 QUIT; 131 132 if (need_comma) 133 { 134 fputs_filtered (", ", stream); 135 need_comma = 0; 136 } 137 138 rep1 = i + 1; 139 reps = 1; 140 while (rep1 < length && string[rep1] == string[i]) 141 { 142 ++rep1; 143 ++reps; 144 } 145 146 if (reps > options->repeat_count_threshold) 147 { 148 if (in_quotes) 149 { 150 if (options->inspect_it) 151 fputs_filtered ("\\\", ", stream); 152 else 153 fputs_filtered ("\", ", stream); 154 in_quotes = 0; 155 } 156 m2_printchar (string[i], type, stream); 157 fprintf_filtered (stream, " <repeats %u times>", reps); 158 i = rep1 - 1; 159 things_printed += options->repeat_count_threshold; 160 need_comma = 1; 161 } 162 else 163 { 164 if (!in_quotes) 165 { 166 if (options->inspect_it) 167 fputs_filtered ("\\\"", stream); 168 else 169 fputs_filtered ("\"", stream); 170 in_quotes = 1; 171 } 172 LA_EMIT_CHAR (string[i], type, stream, '"'); 173 ++things_printed; 174 } 175 } 176 177 /* Terminate the quotes if necessary. */ 178 if (in_quotes) 179 { 180 if (options->inspect_it) 181 fputs_filtered ("\\\"", stream); 182 else 183 fputs_filtered ("\"", stream); 184 } 185 186 if (force_ellipses || i < length) 187 fputs_filtered ("...", stream); 188 } 189 190 static struct value * 191 evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp, 192 int *pos, enum noside noside) 193 { 194 enum exp_opcode op = exp->elts[*pos].opcode; 195 struct value *arg1; 196 struct value *arg2; 197 struct type *type; 198 switch (op) 199 { 200 case UNOP_HIGH: 201 (*pos)++; 202 arg1 = evaluate_subexp_with_coercion (exp, pos, noside); 203 204 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) 205 return arg1; 206 else 207 { 208 arg1 = coerce_ref (arg1); 209 type = check_typedef (value_type (arg1)); 210 211 if (m2_is_unbounded_array (type)) 212 { 213 struct value *temp = arg1; 214 type = TYPE_FIELD_TYPE (type, 1); 215 /* i18n: Do not translate the "_m2_high" part! */ 216 arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL, 217 _("unbounded structure " 218 "missing _m2_high field")); 219 220 if (value_type (arg1) != type) 221 arg1 = value_cast (type, arg1); 222 } 223 } 224 return arg1; 225 226 case BINOP_SUBSCRIPT: 227 (*pos)++; 228 arg1 = evaluate_subexp_with_coercion (exp, pos, noside); 229 arg2 = evaluate_subexp_with_coercion (exp, pos, noside); 230 if (noside == EVAL_SKIP) 231 goto nosideret; 232 /* If the user attempts to subscript something that is not an 233 array or pointer type (like a plain int variable for example), 234 then report this as an error. */ 235 236 arg1 = coerce_ref (arg1); 237 type = check_typedef (value_type (arg1)); 238 239 if (m2_is_unbounded_array (type)) 240 { 241 struct value *temp = arg1; 242 type = TYPE_FIELD_TYPE (type, 0); 243 if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR)) { 244 warning (_("internal error: unbounded array structure is unknown")); 245 return evaluate_subexp_standard (expect_type, exp, pos, noside); 246 } 247 /* i18n: Do not translate the "_m2_contents" part! */ 248 arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL, 249 _("unbounded structure " 250 "missing _m2_contents field")); 251 252 if (value_type (arg1) != type) 253 arg1 = value_cast (type, arg1); 254 255 type = check_typedef (value_type (arg1)); 256 return value_ind (value_ptradd (arg1, value_as_long (arg2))); 257 } 258 else 259 if (TYPE_CODE (type) != TYPE_CODE_ARRAY) 260 { 261 if (TYPE_NAME (type)) 262 error (_("cannot subscript something of type `%s'"), 263 TYPE_NAME (type)); 264 else 265 error (_("cannot subscript requested type")); 266 } 267 268 if (noside == EVAL_AVOID_SIDE_EFFECTS) 269 return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1)); 270 else 271 return value_subscript (arg1, value_as_long (arg2)); 272 273 default: 274 return evaluate_subexp_standard (expect_type, exp, pos, noside); 275 } 276 277 nosideret: 278 return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); 279 } 280 281 282 /* Table of operators and their precedences for printing expressions. */ 283 284 static const struct op_print m2_op_print_tab[] = 285 { 286 {"+", BINOP_ADD, PREC_ADD, 0}, 287 {"+", UNOP_PLUS, PREC_PREFIX, 0}, 288 {"-", BINOP_SUB, PREC_ADD, 0}, 289 {"-", UNOP_NEG, PREC_PREFIX, 0}, 290 {"*", BINOP_MUL, PREC_MUL, 0}, 291 {"/", BINOP_DIV, PREC_MUL, 0}, 292 {"DIV", BINOP_INTDIV, PREC_MUL, 0}, 293 {"MOD", BINOP_REM, PREC_MUL, 0}, 294 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, 295 {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, 296 {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, 297 {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, 298 {"=", BINOP_EQUAL, PREC_EQUAL, 0}, 299 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, 300 {"<=", BINOP_LEQ, PREC_ORDER, 0}, 301 {">=", BINOP_GEQ, PREC_ORDER, 0}, 302 {">", BINOP_GTR, PREC_ORDER, 0}, 303 {"<", BINOP_LESS, PREC_ORDER, 0}, 304 {"^", UNOP_IND, PREC_PREFIX, 0}, 305 {"@", BINOP_REPEAT, PREC_REPEAT, 0}, 306 {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0}, 307 {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0}, 308 {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0}, 309 {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0}, 310 {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0}, 311 {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0}, 312 {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0}, 313 {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0}, 314 {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0}, 315 {NULL, 0, 0, 0} 316 }; 317 318 /* The built-in types of Modula-2. */ 319 320 enum m2_primitive_types { 321 m2_primitive_type_char, 322 m2_primitive_type_int, 323 m2_primitive_type_card, 324 m2_primitive_type_real, 325 m2_primitive_type_bool, 326 nr_m2_primitive_types 327 }; 328 329 static void 330 m2_language_arch_info (struct gdbarch *gdbarch, 331 struct language_arch_info *lai) 332 { 333 const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch); 334 335 lai->string_char_type = builtin->builtin_char; 336 lai->primitive_type_vector 337 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1, 338 struct type *); 339 340 lai->primitive_type_vector [m2_primitive_type_char] 341 = builtin->builtin_char; 342 lai->primitive_type_vector [m2_primitive_type_int] 343 = builtin->builtin_int; 344 lai->primitive_type_vector [m2_primitive_type_card] 345 = builtin->builtin_card; 346 lai->primitive_type_vector [m2_primitive_type_real] 347 = builtin->builtin_real; 348 lai->primitive_type_vector [m2_primitive_type_bool] 349 = builtin->builtin_bool; 350 351 lai->bool_type_symbol = "BOOLEAN"; 352 lai->bool_type_default = builtin->builtin_bool; 353 } 354 355 const struct exp_descriptor exp_descriptor_modula2 = 356 { 357 print_subexp_standard, 358 operator_length_standard, 359 op_name_standard, 360 dump_subexp_body_standard, 361 evaluate_subexp_modula2 362 }; 363 364 const struct language_defn m2_language_defn = 365 { 366 "modula-2", 367 language_m2, 368 range_check_on, 369 type_check_on, 370 case_sensitive_on, 371 array_row_major, 372 macro_expansion_no, 373 &exp_descriptor_modula2, 374 m2_parse, /* parser */ 375 m2_error, /* parser error function */ 376 null_post_parser, 377 m2_printchar, /* Print character constant */ 378 m2_printstr, /* function to print string constant */ 379 m2_emit_char, /* Function to print a single character */ 380 m2_print_type, /* Print a type using appropriate syntax */ 381 m2_print_typedef, /* Print a typedef using appropriate syntax */ 382 m2_val_print, /* Print a value using appropriate syntax */ 383 c_value_print, /* Print a top-level value */ 384 NULL, /* Language specific skip_trampoline */ 385 NULL, /* name_of_this */ 386 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 387 basic_lookup_transparent_type,/* lookup_transparent_type */ 388 NULL, /* Language specific symbol demangler */ 389 NULL, /* Language specific class_name_from_physname */ 390 m2_op_print_tab, /* expression operators for printing */ 391 0, /* arrays are first-class (not c-style) */ 392 0, /* String lower bound */ 393 default_word_break_characters, 394 default_make_symbol_completion_list, 395 m2_language_arch_info, 396 default_print_array_index, 397 default_pass_by_reference, 398 default_get_string, 399 LANG_MAGIC 400 }; 401 402 static void * 403 build_m2_types (struct gdbarch *gdbarch) 404 { 405 struct builtin_m2_type *builtin_m2_type 406 = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type); 407 408 /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */ 409 builtin_m2_type->builtin_int 410 = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER"); 411 builtin_m2_type->builtin_card 412 = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL"); 413 builtin_m2_type->builtin_real 414 = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL", NULL); 415 builtin_m2_type->builtin_char 416 = arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR"); 417 builtin_m2_type->builtin_bool 418 = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN"); 419 420 return builtin_m2_type; 421 } 422 423 static struct gdbarch_data *m2_type_data; 424 425 const struct builtin_m2_type * 426 builtin_m2_type (struct gdbarch *gdbarch) 427 { 428 return gdbarch_data (gdbarch, m2_type_data); 429 } 430 431 432 /* Initialization for Modula-2 */ 433 434 void 435 _initialize_m2_language (void) 436 { 437 m2_type_data = gdbarch_data_register_post_init (build_m2_types); 438 439 add_language (&m2_language_defn); 440 } 441