1 /* Pascal language support routines for GDB, the GNU debugger. 2 3 Copyright (C) 2000, 2002-2005, 2007-2012 Free Software Foundation, 4 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 /* This file is derived from c-lang.c */ 22 23 #include "defs.h" 24 #include "gdb_string.h" 25 #include "symtab.h" 26 #include "gdbtypes.h" 27 #include "expression.h" 28 #include "parser-defs.h" 29 #include "language.h" 30 #include "p-lang.h" 31 #include "valprint.h" 32 #include "value.h" 33 #include <ctype.h> 34 35 extern void _initialize_pascal_language (void); 36 37 38 /* All GPC versions until now (2007-09-27) also define a symbol called 39 '_p_initialize'. Check for the presence of this symbol first. */ 40 static const char GPC_P_INITIALIZE[] = "_p_initialize"; 41 42 /* The name of the symbol that GPC uses as the name of the main 43 procedure (since version 20050212). */ 44 static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program"; 45 46 /* Older versions of GPC (versions older than 20050212) were using 47 a different name for the main procedure. */ 48 static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program"; 49 50 /* Function returning the special symbol name used 51 by GPC for the main procedure in the main program 52 if it is found in minimal symbol list. 53 This function tries to find minimal symbols generated by GPC 54 so that it finds the even if the program was compiled 55 without debugging information. 56 According to information supplied by Waldeck Hebisch, 57 this should work for all versions posterior to June 2000. */ 58 59 const char * 60 pascal_main_name (void) 61 { 62 struct minimal_symbol *msym; 63 64 msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL); 65 66 /* If '_p_initialize' was not found, the main program is likely not 67 written in Pascal. */ 68 if (msym == NULL) 69 return NULL; 70 71 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL); 72 if (msym != NULL) 73 { 74 return GPC_MAIN_PROGRAM_NAME_1; 75 } 76 77 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL); 78 if (msym != NULL) 79 { 80 return GPC_MAIN_PROGRAM_NAME_2; 81 } 82 83 /* No known entry procedure found, the main program is probably 84 not compiled with GPC. */ 85 return NULL; 86 } 87 88 /* Determines if type TYPE is a pascal string type. 89 Returns a positive value if the type is a known pascal string type. 90 This function is used by p-valprint.c code to allow better string display. 91 If it is a pascal string type, then it also sets info needed 92 to get the length and the data of the string 93 length_pos, length_size and string_pos are given in bytes. 94 char_size gives the element size in bytes. 95 FIXME: if the position or the size of these fields 96 are not multiple of TARGET_CHAR_BIT then the results are wrong 97 but this does not happen for Free Pascal nor for GPC. */ 98 int 99 is_pascal_string_type (struct type *type,int *length_pos, 100 int *length_size, int *string_pos, 101 struct type **char_type, 102 char **arrayname) 103 { 104 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT) 105 { 106 /* Old Borland type pascal strings from Free Pascal Compiler. */ 107 /* Two fields: length and st. */ 108 if (TYPE_NFIELDS (type) == 2 109 && TYPE_FIELD_NAME (type, 0) 110 && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0 111 && TYPE_FIELD_NAME (type, 1) 112 && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0) 113 { 114 if (length_pos) 115 *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT; 116 if (length_size) 117 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)); 118 if (string_pos) 119 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; 120 if (char_type) 121 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1)); 122 if (arrayname) 123 *arrayname = TYPE_FIELD_NAME (type, 1); 124 return 2; 125 }; 126 /* GNU pascal strings. */ 127 /* Three fields: Capacity, length and schema$ or _p_schema. */ 128 if (TYPE_NFIELDS (type) == 3 129 && TYPE_FIELD_NAME (type, 0) 130 && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0 131 && TYPE_FIELD_NAME (type, 1) 132 && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0) 133 { 134 if (length_pos) 135 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; 136 if (length_size) 137 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1)); 138 if (string_pos) 139 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT; 140 /* FIXME: how can I detect wide chars in GPC ?? */ 141 if (char_type) 142 { 143 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2)); 144 145 if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY) 146 *char_type = TYPE_TARGET_TYPE (*char_type); 147 } 148 if (arrayname) 149 *arrayname = TYPE_FIELD_NAME (type, 2); 150 return 3; 151 }; 152 } 153 return 0; 154 } 155 156 static void pascal_one_char (int, struct ui_file *, int *); 157 158 /* Print the character C on STREAM as part of the contents of a literal 159 string. 160 In_quotes is reset to 0 if a char is written with #4 notation. */ 161 162 static void 163 pascal_one_char (int c, struct ui_file *stream, int *in_quotes) 164 { 165 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c)))) 166 { 167 if (!(*in_quotes)) 168 fputs_filtered ("'", stream); 169 *in_quotes = 1; 170 if (c == '\'') 171 { 172 fputs_filtered ("''", stream); 173 } 174 else 175 fprintf_filtered (stream, "%c", c); 176 } 177 else 178 { 179 if (*in_quotes) 180 fputs_filtered ("'", stream); 181 *in_quotes = 0; 182 fprintf_filtered (stream, "#%d", (unsigned int) c); 183 } 184 } 185 186 static void pascal_emit_char (int c, struct type *type, 187 struct ui_file *stream, int quoter); 188 189 /* Print the character C on STREAM as part of the contents of a literal 190 string whose delimiter is QUOTER. Note that that format for printing 191 characters and strings is language specific. */ 192 193 static void 194 pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter) 195 { 196 int in_quotes = 0; 197 198 pascal_one_char (c, stream, &in_quotes); 199 if (in_quotes) 200 fputs_filtered ("'", stream); 201 } 202 203 void 204 pascal_printchar (int c, struct type *type, struct ui_file *stream) 205 { 206 int in_quotes = 0; 207 208 pascal_one_char (c, stream, &in_quotes); 209 if (in_quotes) 210 fputs_filtered ("'", stream); 211 } 212 213 /* Print the character string STRING, printing at most LENGTH characters. 214 Printing stops early if the number hits print_max; repeat counts 215 are printed as appropriate. Print ellipses at the end if we 216 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ 217 218 void 219 pascal_printstr (struct ui_file *stream, struct type *type, 220 const gdb_byte *string, unsigned int length, 221 const char *encoding, int force_ellipses, 222 const struct value_print_options *options) 223 { 224 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type)); 225 unsigned int i; 226 unsigned int things_printed = 0; 227 int in_quotes = 0; 228 int need_comma = 0; 229 int width; 230 231 /* Preserve TYPE's original type, just set its LENGTH. */ 232 check_typedef (type); 233 width = TYPE_LENGTH (type); 234 235 /* If the string was not truncated due to `set print elements', and 236 the last byte of it is a null, we don't print that, in traditional C 237 style. */ 238 if ((!force_ellipses) && length > 0 239 && extract_unsigned_integer (string + (length - 1) * width, width, 240 byte_order) == 0) 241 length--; 242 243 if (length == 0) 244 { 245 fputs_filtered ("''", stream); 246 return; 247 } 248 249 for (i = 0; i < length && things_printed < options->print_max; ++i) 250 { 251 /* Position of the character we are examining 252 to see whether it is repeated. */ 253 unsigned int rep1; 254 /* Number of repetitions we have detected so far. */ 255 unsigned int reps; 256 unsigned long int current_char; 257 258 QUIT; 259 260 if (need_comma) 261 { 262 fputs_filtered (", ", stream); 263 need_comma = 0; 264 } 265 266 current_char = extract_unsigned_integer (string + i * width, width, 267 byte_order); 268 269 rep1 = i + 1; 270 reps = 1; 271 while (rep1 < length 272 && extract_unsigned_integer (string + rep1 * width, width, 273 byte_order) == current_char) 274 { 275 ++rep1; 276 ++reps; 277 } 278 279 if (reps > options->repeat_count_threshold) 280 { 281 if (in_quotes) 282 { 283 if (options->inspect_it) 284 fputs_filtered ("\\', ", stream); 285 else 286 fputs_filtered ("', ", stream); 287 in_quotes = 0; 288 } 289 pascal_printchar (current_char, type, stream); 290 fprintf_filtered (stream, " <repeats %u times>", reps); 291 i = rep1 - 1; 292 things_printed += options->repeat_count_threshold; 293 need_comma = 1; 294 } 295 else 296 { 297 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char))) 298 { 299 if (options->inspect_it) 300 fputs_filtered ("\\'", stream); 301 else 302 fputs_filtered ("'", stream); 303 in_quotes = 1; 304 } 305 pascal_one_char (current_char, stream, &in_quotes); 306 ++things_printed; 307 } 308 } 309 310 /* Terminate the quotes if necessary. */ 311 if (in_quotes) 312 { 313 if (options->inspect_it) 314 fputs_filtered ("\\'", stream); 315 else 316 fputs_filtered ("'", stream); 317 } 318 319 if (force_ellipses || i < length) 320 fputs_filtered ("...", stream); 321 } 322 323 324 /* Table mapping opcodes into strings for printing operators 325 and precedences of the operators. */ 326 327 const struct op_print pascal_op_print_tab[] = 328 { 329 {",", BINOP_COMMA, PREC_COMMA, 0}, 330 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, 331 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, 332 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, 333 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, 334 {"=", BINOP_EQUAL, PREC_EQUAL, 0}, 335 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, 336 {"<=", BINOP_LEQ, PREC_ORDER, 0}, 337 {">=", BINOP_GEQ, PREC_ORDER, 0}, 338 {">", BINOP_GTR, PREC_ORDER, 0}, 339 {"<", BINOP_LESS, PREC_ORDER, 0}, 340 {"shr", BINOP_RSH, PREC_SHIFT, 0}, 341 {"shl", BINOP_LSH, PREC_SHIFT, 0}, 342 {"+", BINOP_ADD, PREC_ADD, 0}, 343 {"-", BINOP_SUB, PREC_ADD, 0}, 344 {"*", BINOP_MUL, PREC_MUL, 0}, 345 {"/", BINOP_DIV, PREC_MUL, 0}, 346 {"div", BINOP_INTDIV, PREC_MUL, 0}, 347 {"mod", BINOP_REM, PREC_MUL, 0}, 348 {"@", BINOP_REPEAT, PREC_REPEAT, 0}, 349 {"-", UNOP_NEG, PREC_PREFIX, 0}, 350 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, 351 {"^", UNOP_IND, PREC_SUFFIX, 1}, 352 {"@", UNOP_ADDR, PREC_PREFIX, 0}, 353 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0}, 354 {NULL, 0, 0, 0} 355 }; 356 357 enum pascal_primitive_types { 358 pascal_primitive_type_int, 359 pascal_primitive_type_long, 360 pascal_primitive_type_short, 361 pascal_primitive_type_char, 362 pascal_primitive_type_float, 363 pascal_primitive_type_double, 364 pascal_primitive_type_void, 365 pascal_primitive_type_long_long, 366 pascal_primitive_type_signed_char, 367 pascal_primitive_type_unsigned_char, 368 pascal_primitive_type_unsigned_short, 369 pascal_primitive_type_unsigned_int, 370 pascal_primitive_type_unsigned_long, 371 pascal_primitive_type_unsigned_long_long, 372 pascal_primitive_type_long_double, 373 pascal_primitive_type_complex, 374 pascal_primitive_type_double_complex, 375 nr_pascal_primitive_types 376 }; 377 378 static void 379 pascal_language_arch_info (struct gdbarch *gdbarch, 380 struct language_arch_info *lai) 381 { 382 const struct builtin_type *builtin = builtin_type (gdbarch); 383 384 lai->string_char_type = builtin->builtin_char; 385 lai->primitive_type_vector 386 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1, 387 struct type *); 388 lai->primitive_type_vector [pascal_primitive_type_int] 389 = builtin->builtin_int; 390 lai->primitive_type_vector [pascal_primitive_type_long] 391 = builtin->builtin_long; 392 lai->primitive_type_vector [pascal_primitive_type_short] 393 = builtin->builtin_short; 394 lai->primitive_type_vector [pascal_primitive_type_char] 395 = builtin->builtin_char; 396 lai->primitive_type_vector [pascal_primitive_type_float] 397 = builtin->builtin_float; 398 lai->primitive_type_vector [pascal_primitive_type_double] 399 = builtin->builtin_double; 400 lai->primitive_type_vector [pascal_primitive_type_void] 401 = builtin->builtin_void; 402 lai->primitive_type_vector [pascal_primitive_type_long_long] 403 = builtin->builtin_long_long; 404 lai->primitive_type_vector [pascal_primitive_type_signed_char] 405 = builtin->builtin_signed_char; 406 lai->primitive_type_vector [pascal_primitive_type_unsigned_char] 407 = builtin->builtin_unsigned_char; 408 lai->primitive_type_vector [pascal_primitive_type_unsigned_short] 409 = builtin->builtin_unsigned_short; 410 lai->primitive_type_vector [pascal_primitive_type_unsigned_int] 411 = builtin->builtin_unsigned_int; 412 lai->primitive_type_vector [pascal_primitive_type_unsigned_long] 413 = builtin->builtin_unsigned_long; 414 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long] 415 = builtin->builtin_unsigned_long_long; 416 lai->primitive_type_vector [pascal_primitive_type_long_double] 417 = builtin->builtin_long_double; 418 lai->primitive_type_vector [pascal_primitive_type_complex] 419 = builtin->builtin_complex; 420 lai->primitive_type_vector [pascal_primitive_type_double_complex] 421 = builtin->builtin_double_complex; 422 423 lai->bool_type_symbol = "boolean"; 424 lai->bool_type_default = builtin->builtin_bool; 425 } 426 427 const struct language_defn pascal_language_defn = 428 { 429 "pascal", /* Language name */ 430 language_pascal, 431 range_check_on, 432 type_check_on, 433 case_sensitive_on, 434 array_row_major, 435 macro_expansion_no, 436 &exp_descriptor_standard, 437 pascal_parse, 438 pascal_error, 439 null_post_parser, 440 pascal_printchar, /* Print a character constant */ 441 pascal_printstr, /* Function to print string constant */ 442 pascal_emit_char, /* Print a single char */ 443 pascal_print_type, /* Print a type using appropriate syntax */ 444 pascal_print_typedef, /* Print a typedef using appropriate syntax */ 445 pascal_val_print, /* Print a value using appropriate syntax */ 446 pascal_value_print, /* Print a top-level value */ 447 NULL, /* Language specific skip_trampoline */ 448 "this", /* name_of_this */ 449 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 450 basic_lookup_transparent_type,/* lookup_transparent_type */ 451 NULL, /* Language specific symbol demangler */ 452 NULL, /* Language specific class_name_from_physname */ 453 pascal_op_print_tab, /* expression operators for printing */ 454 1, /* c-style arrays */ 455 0, /* String lower bound */ 456 default_word_break_characters, 457 default_make_symbol_completion_list, 458 pascal_language_arch_info, 459 default_print_array_index, 460 default_pass_by_reference, 461 default_get_string, 462 strcmp_iw_ordered, 463 iterate_over_symbols, 464 LANG_MAGIC 465 }; 466 467 void 468 _initialize_pascal_language (void) 469 { 470 add_language (&pascal_language_defn); 471 } 472