| 1 | /* Pascal language support routines for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2000-2017 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 | /* This file is derived from c-lang.c */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "symtab.h" |
| 24 | #include "gdbtypes.h" |
| 25 | #include "expression.h" |
| 26 | #include "parser-defs.h" |
| 27 | #include "language.h" |
| 28 | #include "varobj.h" |
| 29 | #include "p-lang.h" |
| 30 | #include "valprint.h" |
| 31 | #include "value.h" |
| 32 | #include <ctype.h> |
| 33 | #include "c-lang.h" |
| 34 | |
| 35 | /* All GPC versions until now (2007-09-27) also define a symbol called |
| 36 | '_p_initialize'. Check for the presence of this symbol first. */ |
| 37 | static const char GPC_P_INITIALIZE[] = "_p_initialize"; |
| 38 | |
| 39 | /* The name of the symbol that GPC uses as the name of the main |
| 40 | procedure (since version 20050212). */ |
| 41 | static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program"; |
| 42 | |
| 43 | /* Older versions of GPC (versions older than 20050212) were using |
| 44 | a different name for the main procedure. */ |
| 45 | static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program"; |
| 46 | |
| 47 | /* Function returning the special symbol name used |
| 48 | by GPC for the main procedure in the main program |
| 49 | if it is found in minimal symbol list. |
| 50 | This function tries to find minimal symbols generated by GPC |
| 51 | so that it finds the even if the program was compiled |
| 52 | without debugging information. |
| 53 | According to information supplied by Waldeck Hebisch, |
| 54 | this should work for all versions posterior to June 2000. */ |
| 55 | |
| 56 | const char * |
| 57 | pascal_main_name (void) |
| 58 | { |
| 59 | struct bound_minimal_symbol msym; |
| 60 | |
| 61 | msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL); |
| 62 | |
| 63 | /* If '_p_initialize' was not found, the main program is likely not |
| 64 | written in Pascal. */ |
| 65 | if (msym.minsym == NULL) |
| 66 | return NULL; |
| 67 | |
| 68 | msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL); |
| 69 | if (msym.minsym != NULL) |
| 70 | { |
| 71 | return GPC_MAIN_PROGRAM_NAME_1; |
| 72 | } |
| 73 | |
| 74 | msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL); |
| 75 | if (msym.minsym != NULL) |
| 76 | { |
| 77 | return GPC_MAIN_PROGRAM_NAME_2; |
| 78 | } |
| 79 | |
| 80 | /* No known entry procedure found, the main program is probably |
| 81 | not compiled with GPC. */ |
| 82 | return NULL; |
| 83 | } |
| 84 | |
| 85 | /* Determines if type TYPE is a pascal string type. |
| 86 | Returns a positive value if the type is a known pascal string type. |
| 87 | This function is used by p-valprint.c code to allow better string display. |
| 88 | If it is a pascal string type, then it also sets info needed |
| 89 | to get the length and the data of the string |
| 90 | length_pos, length_size and string_pos are given in bytes. |
| 91 | char_size gives the element size in bytes. |
| 92 | FIXME: if the position or the size of these fields |
| 93 | are not multiple of TARGET_CHAR_BIT then the results are wrong |
| 94 | but this does not happen for Free Pascal nor for GPC. */ |
| 95 | int |
| 96 | is_pascal_string_type (struct type *type,int *length_pos, |
| 97 | int *length_size, int *string_pos, |
| 98 | struct type **char_type, |
| 99 | const char **arrayname) |
| 100 | { |
| 101 | if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 102 | { |
| 103 | /* Old Borland type pascal strings from Free Pascal Compiler. */ |
| 104 | /* Two fields: length and st. */ |
| 105 | if (TYPE_NFIELDS (type) == 2 |
| 106 | && TYPE_FIELD_NAME (type, 0) |
| 107 | && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0 |
| 108 | && TYPE_FIELD_NAME (type, 1) |
| 109 | && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0) |
| 110 | { |
| 111 | if (length_pos) |
| 112 | *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT; |
| 113 | if (length_size) |
| 114 | *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)); |
| 115 | if (string_pos) |
| 116 | *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; |
| 117 | if (char_type) |
| 118 | *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1)); |
| 119 | if (arrayname) |
| 120 | *arrayname = TYPE_FIELD_NAME (type, 1); |
| 121 | return 2; |
| 122 | }; |
| 123 | /* GNU pascal strings. */ |
| 124 | /* Three fields: Capacity, length and schema$ or _p_schema. */ |
| 125 | if (TYPE_NFIELDS (type) == 3 |
| 126 | && TYPE_FIELD_NAME (type, 0) |
| 127 | && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0 |
| 128 | && TYPE_FIELD_NAME (type, 1) |
| 129 | && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0) |
| 130 | { |
| 131 | if (length_pos) |
| 132 | *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; |
| 133 | if (length_size) |
| 134 | *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1)); |
| 135 | if (string_pos) |
| 136 | *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT; |
| 137 | /* FIXME: how can I detect wide chars in GPC ?? */ |
| 138 | if (char_type) |
| 139 | { |
| 140 | *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2)); |
| 141 | |
| 142 | if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY) |
| 143 | *char_type = TYPE_TARGET_TYPE (*char_type); |
| 144 | } |
| 145 | if (arrayname) |
| 146 | *arrayname = TYPE_FIELD_NAME (type, 2); |
| 147 | return 3; |
| 148 | }; |
| 149 | } |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static void pascal_one_char (int, struct ui_file *, int *); |
| 154 | |
| 155 | /* Print the character C on STREAM as part of the contents of a literal |
| 156 | string. |
| 157 | In_quotes is reset to 0 if a char is written with #4 notation. */ |
| 158 | |
| 159 | static void |
| 160 | pascal_one_char (int c, struct ui_file *stream, int *in_quotes) |
| 161 | { |
| 162 | if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c)))) |
| 163 | { |
| 164 | if (!(*in_quotes)) |
| 165 | fputs_filtered ("'", stream); |
| 166 | *in_quotes = 1; |
| 167 | if (c == '\'') |
| 168 | { |
| 169 | fputs_filtered ("''", stream); |
| 170 | } |
| 171 | else |
| 172 | fprintf_filtered (stream, "%c", c); |
| 173 | } |
| 174 | else |
| 175 | { |
| 176 | if (*in_quotes) |
| 177 | fputs_filtered ("'", stream); |
| 178 | *in_quotes = 0; |
| 179 | fprintf_filtered (stream, "#%d", (unsigned int) c); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | static void pascal_emit_char (int c, struct type *type, |
| 184 | struct ui_file *stream, int quoter); |
| 185 | |
| 186 | /* Print the character C on STREAM as part of the contents of a literal |
| 187 | string whose delimiter is QUOTER. Note that that format for printing |
| 188 | characters and strings is language specific. */ |
| 189 | |
| 190 | static void |
| 191 | pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter) |
| 192 | { |
| 193 | int in_quotes = 0; |
| 194 | |
| 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 | |
| 205 | pascal_one_char (c, stream, &in_quotes); |
| 206 | if (in_quotes) |
| 207 | fputs_filtered ("'", stream); |
| 208 | } |
| 209 | |
| 210 | /* Print the character string STRING, printing at most LENGTH characters. |
| 211 | Printing stops early if the number hits print_max; repeat counts |
| 212 | are printed as appropriate. Print ellipses at the end if we |
| 213 | had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ |
| 214 | |
| 215 | void |
| 216 | pascal_printstr (struct ui_file *stream, struct type *type, |
| 217 | const gdb_byte *string, unsigned int length, |
| 218 | const char *encoding, int force_ellipses, |
| 219 | const struct value_print_options *options) |
| 220 | { |
| 221 | enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type)); |
| 222 | unsigned int i; |
| 223 | unsigned int things_printed = 0; |
| 224 | int in_quotes = 0; |
| 225 | int need_comma = 0; |
| 226 | int width; |
| 227 | |
| 228 | /* Preserve TYPE's original type, just set its LENGTH. */ |
| 229 | check_typedef (type); |
| 230 | width = TYPE_LENGTH (type); |
| 231 | |
| 232 | /* If the string was not truncated due to `set print elements', and |
| 233 | the last byte of it is a null, we don't print that, in traditional C |
| 234 | style. */ |
| 235 | if ((!force_ellipses) && length > 0 |
| 236 | && extract_unsigned_integer (string + (length - 1) * width, width, |
| 237 | byte_order) == 0) |
| 238 | length--; |
| 239 | |
| 240 | if (length == 0) |
| 241 | { |
| 242 | fputs_filtered ("''", stream); |
| 243 | return; |
| 244 | } |
| 245 | |
| 246 | for (i = 0; i < length && things_printed < options->print_max; ++i) |
| 247 | { |
| 248 | /* Position of the character we are examining |
| 249 | to see whether it is repeated. */ |
| 250 | unsigned int rep1; |
| 251 | /* Number of repetitions we have detected so far. */ |
| 252 | unsigned int reps; |
| 253 | unsigned long int current_char; |
| 254 | |
| 255 | QUIT; |
| 256 | |
| 257 | if (need_comma) |
| 258 | { |
| 259 | fputs_filtered (", ", stream); |
| 260 | need_comma = 0; |
| 261 | } |
| 262 | |
| 263 | current_char = extract_unsigned_integer (string + i * width, width, |
| 264 | byte_order); |
| 265 | |
| 266 | rep1 = i + 1; |
| 267 | reps = 1; |
| 268 | while (rep1 < length |
| 269 | && extract_unsigned_integer (string + rep1 * width, width, |
| 270 | byte_order) == current_char) |
| 271 | { |
| 272 | ++rep1; |
| 273 | ++reps; |
| 274 | } |
| 275 | |
| 276 | if (reps > options->repeat_count_threshold) |
| 277 | { |
| 278 | if (in_quotes) |
| 279 | { |
| 280 | fputs_filtered ("', ", stream); |
| 281 | in_quotes = 0; |
| 282 | } |
| 283 | pascal_printchar (current_char, type, stream); |
| 284 | fprintf_filtered (stream, " <repeats %u times>", reps); |
| 285 | i = rep1 - 1; |
| 286 | things_printed += options->repeat_count_threshold; |
| 287 | need_comma = 1; |
| 288 | } |
| 289 | else |
| 290 | { |
| 291 | if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char))) |
| 292 | { |
| 293 | fputs_filtered ("'", stream); |
| 294 | in_quotes = 1; |
| 295 | } |
| 296 | pascal_one_char (current_char, stream, &in_quotes); |
| 297 | ++things_printed; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /* Terminate the quotes if necessary. */ |
| 302 | if (in_quotes) |
| 303 | fputs_filtered ("'", stream); |
| 304 | |
| 305 | if (force_ellipses || i < length) |
| 306 | fputs_filtered ("...", stream); |
| 307 | } |
| 308 | \f |
| 309 | |
| 310 | /* Table mapping opcodes into strings for printing operators |
| 311 | and precedences of the operators. */ |
| 312 | |
| 313 | const struct op_print pascal_op_print_tab[] = |
| 314 | { |
| 315 | {",", BINOP_COMMA, PREC_COMMA, 0}, |
| 316 | {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, |
| 317 | {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, |
| 318 | {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, |
| 319 | {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, |
| 320 | {"=", BINOP_EQUAL, PREC_EQUAL, 0}, |
| 321 | {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, |
| 322 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, |
| 323 | {">=", BINOP_GEQ, PREC_ORDER, 0}, |
| 324 | {">", BINOP_GTR, PREC_ORDER, 0}, |
| 325 | {"<", BINOP_LESS, PREC_ORDER, 0}, |
| 326 | {"shr", BINOP_RSH, PREC_SHIFT, 0}, |
| 327 | {"shl", BINOP_LSH, PREC_SHIFT, 0}, |
| 328 | {"+", BINOP_ADD, PREC_ADD, 0}, |
| 329 | {"-", BINOP_SUB, PREC_ADD, 0}, |
| 330 | {"*", BINOP_MUL, PREC_MUL, 0}, |
| 331 | {"/", BINOP_DIV, PREC_MUL, 0}, |
| 332 | {"div", BINOP_INTDIV, PREC_MUL, 0}, |
| 333 | {"mod", BINOP_REM, PREC_MUL, 0}, |
| 334 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, |
| 335 | {"-", UNOP_NEG, PREC_PREFIX, 0}, |
| 336 | {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, |
| 337 | {"^", UNOP_IND, PREC_SUFFIX, 1}, |
| 338 | {"@", UNOP_ADDR, PREC_PREFIX, 0}, |
| 339 | {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0}, |
| 340 | {NULL, OP_NULL, PREC_PREFIX, 0} |
| 341 | }; |
| 342 | \f |
| 343 | enum pascal_primitive_types { |
| 344 | pascal_primitive_type_int, |
| 345 | pascal_primitive_type_long, |
| 346 | pascal_primitive_type_short, |
| 347 | pascal_primitive_type_char, |
| 348 | pascal_primitive_type_float, |
| 349 | pascal_primitive_type_double, |
| 350 | pascal_primitive_type_void, |
| 351 | pascal_primitive_type_long_long, |
| 352 | pascal_primitive_type_signed_char, |
| 353 | pascal_primitive_type_unsigned_char, |
| 354 | pascal_primitive_type_unsigned_short, |
| 355 | pascal_primitive_type_unsigned_int, |
| 356 | pascal_primitive_type_unsigned_long, |
| 357 | pascal_primitive_type_unsigned_long_long, |
| 358 | pascal_primitive_type_long_double, |
| 359 | pascal_primitive_type_complex, |
| 360 | pascal_primitive_type_double_complex, |
| 361 | nr_pascal_primitive_types |
| 362 | }; |
| 363 | |
| 364 | static void |
| 365 | pascal_language_arch_info (struct gdbarch *gdbarch, |
| 366 | struct language_arch_info *lai) |
| 367 | { |
| 368 | const struct builtin_type *builtin = builtin_type (gdbarch); |
| 369 | |
| 370 | lai->string_char_type = builtin->builtin_char; |
| 371 | lai->primitive_type_vector |
| 372 | = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1, |
| 373 | struct type *); |
| 374 | lai->primitive_type_vector [pascal_primitive_type_int] |
| 375 | = builtin->builtin_int; |
| 376 | lai->primitive_type_vector [pascal_primitive_type_long] |
| 377 | = builtin->builtin_long; |
| 378 | lai->primitive_type_vector [pascal_primitive_type_short] |
| 379 | = builtin->builtin_short; |
| 380 | lai->primitive_type_vector [pascal_primitive_type_char] |
| 381 | = builtin->builtin_char; |
| 382 | lai->primitive_type_vector [pascal_primitive_type_float] |
| 383 | = builtin->builtin_float; |
| 384 | lai->primitive_type_vector [pascal_primitive_type_double] |
| 385 | = builtin->builtin_double; |
| 386 | lai->primitive_type_vector [pascal_primitive_type_void] |
| 387 | = builtin->builtin_void; |
| 388 | lai->primitive_type_vector [pascal_primitive_type_long_long] |
| 389 | = builtin->builtin_long_long; |
| 390 | lai->primitive_type_vector [pascal_primitive_type_signed_char] |
| 391 | = builtin->builtin_signed_char; |
| 392 | lai->primitive_type_vector [pascal_primitive_type_unsigned_char] |
| 393 | = builtin->builtin_unsigned_char; |
| 394 | lai->primitive_type_vector [pascal_primitive_type_unsigned_short] |
| 395 | = builtin->builtin_unsigned_short; |
| 396 | lai->primitive_type_vector [pascal_primitive_type_unsigned_int] |
| 397 | = builtin->builtin_unsigned_int; |
| 398 | lai->primitive_type_vector [pascal_primitive_type_unsigned_long] |
| 399 | = builtin->builtin_unsigned_long; |
| 400 | lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long] |
| 401 | = builtin->builtin_unsigned_long_long; |
| 402 | lai->primitive_type_vector [pascal_primitive_type_long_double] |
| 403 | = builtin->builtin_long_double; |
| 404 | lai->primitive_type_vector [pascal_primitive_type_complex] |
| 405 | = builtin->builtin_complex; |
| 406 | lai->primitive_type_vector [pascal_primitive_type_double_complex] |
| 407 | = builtin->builtin_double_complex; |
| 408 | |
| 409 | lai->bool_type_symbol = "boolean"; |
| 410 | lai->bool_type_default = builtin->builtin_bool; |
| 411 | } |
| 412 | |
| 413 | static const char *p_extensions[] = |
| 414 | { |
| 415 | ".pas", ".p", ".pp", NULL |
| 416 | }; |
| 417 | |
| 418 | extern const struct language_defn pascal_language_defn = |
| 419 | { |
| 420 | "pascal", /* Language name */ |
| 421 | "Pascal", |
| 422 | language_pascal, |
| 423 | range_check_on, |
| 424 | case_sensitive_on, |
| 425 | array_row_major, |
| 426 | macro_expansion_no, |
| 427 | p_extensions, |
| 428 | &exp_descriptor_standard, |
| 429 | pascal_parse, |
| 430 | pascal_yyerror, |
| 431 | null_post_parser, |
| 432 | pascal_printchar, /* Print a character constant */ |
| 433 | pascal_printstr, /* Function to print string constant */ |
| 434 | pascal_emit_char, /* Print a single char */ |
| 435 | pascal_print_type, /* Print a type using appropriate syntax */ |
| 436 | pascal_print_typedef, /* Print a typedef using appropriate syntax */ |
| 437 | pascal_val_print, /* Print a value using appropriate syntax */ |
| 438 | pascal_value_print, /* Print a top-level value */ |
| 439 | default_read_var_value, /* la_read_var_value */ |
| 440 | NULL, /* Language specific skip_trampoline */ |
| 441 | "this", /* name_of_this */ |
| 442 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
| 443 | basic_lookup_transparent_type,/* lookup_transparent_type */ |
| 444 | NULL, /* Language specific symbol demangler */ |
| 445 | NULL, |
| 446 | NULL, /* Language specific class_name_from_physname */ |
| 447 | pascal_op_print_tab, /* expression operators for printing */ |
| 448 | 1, /* c-style arrays */ |
| 449 | 0, /* String lower bound */ |
| 450 | default_word_break_characters, |
| 451 | default_collect_symbol_completion_matches, |
| 452 | pascal_language_arch_info, |
| 453 | default_print_array_index, |
| 454 | default_pass_by_reference, |
| 455 | default_get_string, |
| 456 | c_watch_location_expression, |
| 457 | NULL, /* la_get_symbol_name_cmp */ |
| 458 | iterate_over_symbols, |
| 459 | &default_varobj_ops, |
| 460 | NULL, |
| 461 | NULL, |
| 462 | LANG_MAGIC |
| 463 | }; |