1 /* Pascal language support routines for GDB, the GNU debugger. 2 3 Copyright (C) 2000, 2002, 2003, 2004, 2005, 2007, 2008, 2009 4 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 /* 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_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 && strcmp (TYPE_FIELDS (type)[0].name, "length") == 0 110 && strcmp (TYPE_FIELDS (type)[1].name, "st") == 0) 111 { 112 if (length_pos) 113 *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT; 114 if (length_size) 115 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)); 116 if (string_pos) 117 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; 118 if (char_type) 119 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1)); 120 if (arrayname) 121 *arrayname = TYPE_FIELDS (type)[1].name; 122 return 2; 123 }; 124 /* GNU pascal strings. */ 125 /* Three fields: Capacity, length and schema$ or _p_schema. */ 126 if (TYPE_NFIELDS (type) == 3 127 && strcmp (TYPE_FIELDS (type)[0].name, "Capacity") == 0 128 && strcmp (TYPE_FIELDS (type)[1].name, "length") == 0) 129 { 130 if (length_pos) 131 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; 132 if (length_size) 133 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1)); 134 if (string_pos) 135 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT; 136 /* FIXME: how can I detect wide chars in GPC ?? */ 137 if (char_type) 138 { 139 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2)); 140 if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY) 141 *char_type = TYPE_TARGET_TYPE (*char_type); 142 } 143 if (arrayname) 144 *arrayname = TYPE_FIELDS (type)[2].name; 145 return 3; 146 }; 147 } 148 return 0; 149 } 150 151 static void pascal_one_char (int, struct ui_file *, int *); 152 153 /* Print the character C on STREAM as part of the contents of a literal 154 string. 155 In_quotes is reset to 0 if a char is written with #4 notation */ 156 157 static void 158 pascal_one_char (int c, struct ui_file *stream, int *in_quotes) 159 { 160 161 c &= 0xFF; /* Avoid sign bit follies */ 162 163 if ((c == '\'') || (PRINT_LITERAL_FORM (c))) 164 { 165 if (!(*in_quotes)) 166 fputs_filtered ("'", stream); 167 *in_quotes = 1; 168 if (c == '\'') 169 { 170 fputs_filtered ("''", stream); 171 } 172 else 173 fprintf_filtered (stream, "%c", c); 174 } 175 else 176 { 177 if (*in_quotes) 178 fputs_filtered ("'", stream); 179 *in_quotes = 0; 180 fprintf_filtered (stream, "#%d", (unsigned int) c); 181 } 182 } 183 184 static void pascal_emit_char (int c, struct type *type, 185 struct ui_file *stream, int quoter); 186 187 /* Print the character C on STREAM as part of the contents of a literal 188 string whose delimiter is QUOTER. Note that that format for printing 189 characters and strings is language specific. */ 190 191 static void 192 pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter) 193 { 194 int in_quotes = 0; 195 pascal_one_char (c, stream, &in_quotes); 196 if (in_quotes) 197 fputs_filtered ("'", stream); 198 } 199 200 void 201 pascal_printchar (int c, struct type *type, struct ui_file *stream) 202 { 203 int in_quotes = 0; 204 pascal_one_char (c, stream, &in_quotes); 205 if (in_quotes) 206 fputs_filtered ("'", stream); 207 } 208 209 /* Print the character string STRING, printing at most LENGTH characters. 210 Printing stops early if the number hits print_max; repeat counts 211 are printed as appropriate. Print ellipses at the end if we 212 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ 213 214 void 215 pascal_printstr (struct ui_file *stream, struct type *type, 216 const gdb_byte *string, unsigned int length, 217 int force_ellipses, 218 const struct value_print_options *options) 219 { 220 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type)); 221 unsigned int i; 222 unsigned int things_printed = 0; 223 int in_quotes = 0; 224 int need_comma = 0; 225 int width = TYPE_LENGTH (type); 226 227 /* If the string was not truncated due to `set print elements', and 228 the last byte of it is a null, we don't print that, in traditional C 229 style. */ 230 if ((!force_ellipses) && length > 0 231 && extract_unsigned_integer (string + (length - 1) * width, width, 232 byte_order) == 0) 233 length--; 234 235 if (length == 0) 236 { 237 fputs_filtered ("''", stream); 238 return; 239 } 240 241 for (i = 0; i < length && things_printed < options->print_max; ++i) 242 { 243 /* Position of the character we are examining 244 to see whether it is repeated. */ 245 unsigned int rep1; 246 /* Number of repetitions we have detected so far. */ 247 unsigned int reps; 248 unsigned long int current_char; 249 250 QUIT; 251 252 if (need_comma) 253 { 254 fputs_filtered (", ", stream); 255 need_comma = 0; 256 } 257 258 current_char = extract_unsigned_integer (string + i * width, width, 259 byte_order); 260 261 rep1 = i + 1; 262 reps = 1; 263 while (rep1 < length 264 && extract_unsigned_integer (string + rep1 * width, width, 265 byte_order) == current_char) 266 { 267 ++rep1; 268 ++reps; 269 } 270 271 if (reps > options->repeat_count_threshold) 272 { 273 if (in_quotes) 274 { 275 if (options->inspect_it) 276 fputs_filtered ("\\', ", stream); 277 else 278 fputs_filtered ("', ", stream); 279 in_quotes = 0; 280 } 281 pascal_printchar (current_char, type, stream); 282 fprintf_filtered (stream, " <repeats %u times>", reps); 283 i = rep1 - 1; 284 things_printed += options->repeat_count_threshold; 285 need_comma = 1; 286 } 287 else 288 { 289 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char))) 290 { 291 if (options->inspect_it) 292 fputs_filtered ("\\'", stream); 293 else 294 fputs_filtered ("'", stream); 295 in_quotes = 1; 296 } 297 pascal_one_char (current_char, stream, &in_quotes); 298 ++things_printed; 299 } 300 } 301 302 /* Terminate the quotes if necessary. */ 303 if (in_quotes) 304 { 305 if (options->inspect_it) 306 fputs_filtered ("\\'", stream); 307 else 308 fputs_filtered ("'", stream); 309 } 310 311 if (force_ellipses || i < length) 312 fputs_filtered ("...", stream); 313 } 314 315 316 /* Table mapping opcodes into strings for printing operators 317 and precedences of the operators. */ 318 319 const struct op_print pascal_op_print_tab[] = 320 { 321 {",", BINOP_COMMA, PREC_COMMA, 0}, 322 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, 323 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, 324 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, 325 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, 326 {"=", BINOP_EQUAL, PREC_EQUAL, 0}, 327 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, 328 {"<=", BINOP_LEQ, PREC_ORDER, 0}, 329 {">=", BINOP_GEQ, PREC_ORDER, 0}, 330 {">", BINOP_GTR, PREC_ORDER, 0}, 331 {"<", BINOP_LESS, PREC_ORDER, 0}, 332 {"shr", BINOP_RSH, PREC_SHIFT, 0}, 333 {"shl", BINOP_LSH, PREC_SHIFT, 0}, 334 {"+", BINOP_ADD, PREC_ADD, 0}, 335 {"-", BINOP_SUB, PREC_ADD, 0}, 336 {"*", BINOP_MUL, PREC_MUL, 0}, 337 {"/", BINOP_DIV, PREC_MUL, 0}, 338 {"div", BINOP_INTDIV, PREC_MUL, 0}, 339 {"mod", BINOP_REM, PREC_MUL, 0}, 340 {"@", BINOP_REPEAT, PREC_REPEAT, 0}, 341 {"-", UNOP_NEG, PREC_PREFIX, 0}, 342 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, 343 {"^", UNOP_IND, PREC_SUFFIX, 1}, 344 {"@", UNOP_ADDR, PREC_PREFIX, 0}, 345 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0}, 346 {NULL, 0, 0, 0} 347 }; 348 349 enum pascal_primitive_types { 350 pascal_primitive_type_int, 351 pascal_primitive_type_long, 352 pascal_primitive_type_short, 353 pascal_primitive_type_char, 354 pascal_primitive_type_float, 355 pascal_primitive_type_double, 356 pascal_primitive_type_void, 357 pascal_primitive_type_long_long, 358 pascal_primitive_type_signed_char, 359 pascal_primitive_type_unsigned_char, 360 pascal_primitive_type_unsigned_short, 361 pascal_primitive_type_unsigned_int, 362 pascal_primitive_type_unsigned_long, 363 pascal_primitive_type_unsigned_long_long, 364 pascal_primitive_type_long_double, 365 pascal_primitive_type_complex, 366 pascal_primitive_type_double_complex, 367 nr_pascal_primitive_types 368 }; 369 370 static void 371 pascal_language_arch_info (struct gdbarch *gdbarch, 372 struct language_arch_info *lai) 373 { 374 const struct builtin_type *builtin = builtin_type (gdbarch); 375 lai->string_char_type = builtin->builtin_char; 376 lai->primitive_type_vector 377 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1, 378 struct type *); 379 lai->primitive_type_vector [pascal_primitive_type_int] 380 = builtin->builtin_int; 381 lai->primitive_type_vector [pascal_primitive_type_long] 382 = builtin->builtin_long; 383 lai->primitive_type_vector [pascal_primitive_type_short] 384 = builtin->builtin_short; 385 lai->primitive_type_vector [pascal_primitive_type_char] 386 = builtin->builtin_char; 387 lai->primitive_type_vector [pascal_primitive_type_float] 388 = builtin->builtin_float; 389 lai->primitive_type_vector [pascal_primitive_type_double] 390 = builtin->builtin_double; 391 lai->primitive_type_vector [pascal_primitive_type_void] 392 = builtin->builtin_void; 393 lai->primitive_type_vector [pascal_primitive_type_long_long] 394 = builtin->builtin_long_long; 395 lai->primitive_type_vector [pascal_primitive_type_signed_char] 396 = builtin->builtin_signed_char; 397 lai->primitive_type_vector [pascal_primitive_type_unsigned_char] 398 = builtin->builtin_unsigned_char; 399 lai->primitive_type_vector [pascal_primitive_type_unsigned_short] 400 = builtin->builtin_unsigned_short; 401 lai->primitive_type_vector [pascal_primitive_type_unsigned_int] 402 = builtin->builtin_unsigned_int; 403 lai->primitive_type_vector [pascal_primitive_type_unsigned_long] 404 = builtin->builtin_unsigned_long; 405 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long] 406 = builtin->builtin_unsigned_long_long; 407 lai->primitive_type_vector [pascal_primitive_type_long_double] 408 = builtin->builtin_long_double; 409 lai->primitive_type_vector [pascal_primitive_type_complex] 410 = builtin->builtin_complex; 411 lai->primitive_type_vector [pascal_primitive_type_double_complex] 412 = builtin->builtin_double_complex; 413 414 lai->bool_type_symbol = "boolean"; 415 lai->bool_type_default = builtin->builtin_bool; 416 } 417 418 const struct language_defn pascal_language_defn = 419 { 420 "pascal", /* Language name */ 421 language_pascal, 422 range_check_on, 423 type_check_on, 424 case_sensitive_on, 425 array_row_major, 426 macro_expansion_no, 427 &exp_descriptor_standard, 428 pascal_parse, 429 pascal_error, 430 null_post_parser, 431 pascal_printchar, /* Print a character constant */ 432 pascal_printstr, /* Function to print string constant */ 433 pascal_emit_char, /* Print a single char */ 434 pascal_print_type, /* Print a type using appropriate syntax */ 435 pascal_print_typedef, /* Print a typedef using appropriate syntax */ 436 pascal_val_print, /* Print a value using appropriate syntax */ 437 pascal_value_print, /* Print a top-level value */ 438 NULL, /* Language specific skip_trampoline */ 439 "this", /* name_of_this */ 440 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 441 basic_lookup_transparent_type,/* lookup_transparent_type */ 442 NULL, /* Language specific symbol demangler */ 443 NULL, /* Language specific class_name_from_physname */ 444 pascal_op_print_tab, /* expression operators for printing */ 445 1, /* c-style arrays */ 446 0, /* String lower bound */ 447 default_word_break_characters, 448 default_make_symbol_completion_list, 449 pascal_language_arch_info, 450 default_print_array_index, 451 default_pass_by_reference, 452 default_get_string, 453 LANG_MAGIC 454 }; 455 456 void 457 _initialize_pascal_language (void) 458 { 459 add_language (&pascal_language_defn); 460 } 461