| 1 | /* Pascal language support routines for GDB, the GNU debugger. |
| 2 | Copyright 2000, 2002, 2003, 2004 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | /* This file is derived from c-lang.c */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdb_string.h" |
| 24 | #include "symtab.h" |
| 25 | #include "gdbtypes.h" |
| 26 | #include "expression.h" |
| 27 | #include "parser-defs.h" |
| 28 | #include "language.h" |
| 29 | #include "p-lang.h" |
| 30 | #include "valprint.h" |
| 31 | #include "value.h" |
| 32 | #include <ctype.h> |
| 33 | |
| 34 | extern void _initialize_pascal_language (void); |
| 35 | |
| 36 | |
| 37 | /* Determines if type TYPE is a pascal string type. |
| 38 | Returns 1 if the type is a known pascal type |
| 39 | This function is used by p-valprint.c code to allow better string display. |
| 40 | If it is a pascal string type, then it also sets info needed |
| 41 | to get the length and the data of the string |
| 42 | length_pos, length_size and string_pos are given in bytes. |
| 43 | char_size gives the element size in bytes. |
| 44 | FIXME: if the position or the size of these fields |
| 45 | are not multiple of TARGET_CHAR_BIT then the results are wrong |
| 46 | but this does not happen for Free Pascal nor for GPC. */ |
| 47 | int |
| 48 | is_pascal_string_type (struct type *type,int *length_pos, |
| 49 | int *length_size, int *string_pos, int *char_size, |
| 50 | char **arrayname) |
| 51 | { |
| 52 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 53 | { |
| 54 | /* Old Borland type pascal strings from Free Pascal Compiler. */ |
| 55 | /* Two fields: length and st. */ |
| 56 | if (TYPE_NFIELDS (type) == 2 |
| 57 | && strcmp (TYPE_FIELDS (type)[0].name, "length") == 0 |
| 58 | && strcmp (TYPE_FIELDS (type)[1].name, "st") == 0) |
| 59 | { |
| 60 | if (length_pos) |
| 61 | *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT; |
| 62 | if (length_size) |
| 63 | *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)); |
| 64 | if (string_pos) |
| 65 | *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; |
| 66 | if (char_size) |
| 67 | *char_size = 1; |
| 68 | if (arrayname) |
| 69 | *arrayname = TYPE_FIELDS (type)[1].name; |
| 70 | return 2; |
| 71 | }; |
| 72 | /* GNU pascal strings. */ |
| 73 | /* Three fields: Capacity, length and schema$ or _p_schema. */ |
| 74 | if (TYPE_NFIELDS (type) == 3 |
| 75 | && strcmp (TYPE_FIELDS (type)[0].name, "Capacity") == 0 |
| 76 | && strcmp (TYPE_FIELDS (type)[1].name, "length") == 0) |
| 77 | { |
| 78 | if (length_pos) |
| 79 | *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT; |
| 80 | if (length_size) |
| 81 | *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1)); |
| 82 | if (string_pos) |
| 83 | *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT; |
| 84 | /* FIXME: how can I detect wide chars in GPC ?? */ |
| 85 | if (char_size) |
| 86 | *char_size = 1; |
| 87 | if (arrayname) |
| 88 | *arrayname = TYPE_FIELDS (type)[2].name; |
| 89 | return 3; |
| 90 | }; |
| 91 | } |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static void pascal_one_char (int, struct ui_file *, int *); |
| 96 | |
| 97 | /* Print the character C on STREAM as part of the contents of a literal |
| 98 | string. |
| 99 | In_quotes is reset to 0 if a char is written with #4 notation */ |
| 100 | |
| 101 | static void |
| 102 | pascal_one_char (int c, struct ui_file *stream, int *in_quotes) |
| 103 | { |
| 104 | |
| 105 | c &= 0xFF; /* Avoid sign bit follies */ |
| 106 | |
| 107 | if ((c == '\'') || (PRINT_LITERAL_FORM (c))) |
| 108 | { |
| 109 | if (!(*in_quotes)) |
| 110 | fputs_filtered ("'", stream); |
| 111 | *in_quotes = 1; |
| 112 | if (c == '\'') |
| 113 | { |
| 114 | fputs_filtered ("''", stream); |
| 115 | } |
| 116 | else |
| 117 | fprintf_filtered (stream, "%c", c); |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | if (*in_quotes) |
| 122 | fputs_filtered ("'", stream); |
| 123 | *in_quotes = 0; |
| 124 | fprintf_filtered (stream, "#%d", (unsigned int) c); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static void pascal_emit_char (int c, struct ui_file *stream, int quoter); |
| 129 | |
| 130 | /* Print the character C on STREAM as part of the contents of a literal |
| 131 | string whose delimiter is QUOTER. Note that that format for printing |
| 132 | characters and strings is language specific. */ |
| 133 | |
| 134 | static void |
| 135 | pascal_emit_char (int c, struct ui_file *stream, int quoter) |
| 136 | { |
| 137 | int in_quotes = 0; |
| 138 | pascal_one_char (c, stream, &in_quotes); |
| 139 | if (in_quotes) |
| 140 | fputs_filtered ("'", stream); |
| 141 | } |
| 142 | |
| 143 | void |
| 144 | pascal_printchar (int c, struct ui_file *stream) |
| 145 | { |
| 146 | int in_quotes = 0; |
| 147 | pascal_one_char (c, stream, &in_quotes); |
| 148 | if (in_quotes) |
| 149 | fputs_filtered ("'", stream); |
| 150 | } |
| 151 | |
| 152 | /* Print the character string STRING, printing at most LENGTH characters. |
| 153 | Printing stops early if the number hits print_max; repeat counts |
| 154 | are printed as appropriate. Print ellipses at the end if we |
| 155 | had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ |
| 156 | |
| 157 | void |
| 158 | pascal_printstr (struct ui_file *stream, char *string, unsigned int length, |
| 159 | int width, int force_ellipses) |
| 160 | { |
| 161 | unsigned int i; |
| 162 | unsigned int things_printed = 0; |
| 163 | int in_quotes = 0; |
| 164 | int need_comma = 0; |
| 165 | |
| 166 | /* If the string was not truncated due to `set print elements', and |
| 167 | the last byte of it is a null, we don't print that, in traditional C |
| 168 | style. */ |
| 169 | if ((!force_ellipses) && length > 0 && string[length - 1] == '\0') |
| 170 | length--; |
| 171 | |
| 172 | if (length == 0) |
| 173 | { |
| 174 | fputs_filtered ("''", stream); |
| 175 | return; |
| 176 | } |
| 177 | |
| 178 | for (i = 0; i < length && things_printed < print_max; ++i) |
| 179 | { |
| 180 | /* Position of the character we are examining |
| 181 | to see whether it is repeated. */ |
| 182 | unsigned int rep1; |
| 183 | /* Number of repetitions we have detected so far. */ |
| 184 | unsigned int reps; |
| 185 | |
| 186 | QUIT; |
| 187 | |
| 188 | if (need_comma) |
| 189 | { |
| 190 | fputs_filtered (", ", stream); |
| 191 | need_comma = 0; |
| 192 | } |
| 193 | |
| 194 | rep1 = i + 1; |
| 195 | reps = 1; |
| 196 | while (rep1 < length && string[rep1] == string[i]) |
| 197 | { |
| 198 | ++rep1; |
| 199 | ++reps; |
| 200 | } |
| 201 | |
| 202 | if (reps > repeat_count_threshold) |
| 203 | { |
| 204 | if (in_quotes) |
| 205 | { |
| 206 | if (inspect_it) |
| 207 | fputs_filtered ("\\', ", stream); |
| 208 | else |
| 209 | fputs_filtered ("', ", stream); |
| 210 | in_quotes = 0; |
| 211 | } |
| 212 | pascal_printchar (string[i], stream); |
| 213 | fprintf_filtered (stream, " <repeats %u times>", reps); |
| 214 | i = rep1 - 1; |
| 215 | things_printed += repeat_count_threshold; |
| 216 | need_comma = 1; |
| 217 | } |
| 218 | else |
| 219 | { |
| 220 | int c = string[i]; |
| 221 | if ((!in_quotes) && (PRINT_LITERAL_FORM (c))) |
| 222 | { |
| 223 | if (inspect_it) |
| 224 | fputs_filtered ("\\'", stream); |
| 225 | else |
| 226 | fputs_filtered ("'", stream); |
| 227 | in_quotes = 1; |
| 228 | } |
| 229 | pascal_one_char (c, stream, &in_quotes); |
| 230 | ++things_printed; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /* Terminate the quotes if necessary. */ |
| 235 | if (in_quotes) |
| 236 | { |
| 237 | if (inspect_it) |
| 238 | fputs_filtered ("\\'", stream); |
| 239 | else |
| 240 | fputs_filtered ("'", stream); |
| 241 | } |
| 242 | |
| 243 | if (force_ellipses || i < length) |
| 244 | fputs_filtered ("...", stream); |
| 245 | } |
| 246 | |
| 247 | /* Create a fundamental Pascal type using default reasonable for the current |
| 248 | target machine. |
| 249 | |
| 250 | Some object/debugging file formats (DWARF version 1, COFF, etc) do not |
| 251 | define fundamental types such as "int" or "double". Others (stabs or |
| 252 | DWARF version 2, etc) do define fundamental types. For the formats which |
| 253 | don't provide fundamental types, gdb can create such types using this |
| 254 | function. |
| 255 | |
| 256 | FIXME: Some compilers distinguish explicitly signed integral types |
| 257 | (signed short, signed int, signed long) from "regular" integral types |
| 258 | (short, int, long) in the debugging information. There is some dis- |
| 259 | agreement as to how useful this feature is. In particular, gcc does |
| 260 | not support this. Also, only some debugging formats allow the |
| 261 | distinction to be passed on to a debugger. For now, we always just |
| 262 | use "short", "int", or "long" as the type name, for both the implicit |
| 263 | and explicitly signed types. This also makes life easier for the |
| 264 | gdb test suite since we don't have to account for the differences |
| 265 | in output depending upon what the compiler and debugging format |
| 266 | support. We will probably have to re-examine the issue when gdb |
| 267 | starts taking it's fundamental type information directly from the |
| 268 | debugging information supplied by the compiler. fnf@cygnus.com */ |
| 269 | |
| 270 | /* Note there might be some discussion about the choosen correspondance |
| 271 | because it mainly reflects Free Pascal Compiler setup for now PM */ |
| 272 | |
| 273 | |
| 274 | struct type * |
| 275 | pascal_create_fundamental_type (struct objfile *objfile, int typeid) |
| 276 | { |
| 277 | struct type *type = NULL; |
| 278 | |
| 279 | switch (typeid) |
| 280 | { |
| 281 | default: |
| 282 | /* FIXME: For now, if we are asked to produce a type not in this |
| 283 | language, create the equivalent of a C integer type with the |
| 284 | name "<?type?>". When all the dust settles from the type |
| 285 | reconstruction work, this should probably become an error. */ |
| 286 | type = init_type (TYPE_CODE_INT, |
| 287 | TARGET_INT_BIT / TARGET_CHAR_BIT, |
| 288 | 0, "<?type?>", objfile); |
| 289 | warning ("internal error: no Pascal fundamental type %d", typeid); |
| 290 | break; |
| 291 | case FT_VOID: |
| 292 | type = init_type (TYPE_CODE_VOID, |
| 293 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, |
| 294 | 0, "void", objfile); |
| 295 | break; |
| 296 | case FT_CHAR: |
| 297 | type = init_type (TYPE_CODE_CHAR, |
| 298 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, |
| 299 | 0, "char", objfile); |
| 300 | break; |
| 301 | case FT_SIGNED_CHAR: |
| 302 | type = init_type (TYPE_CODE_INT, |
| 303 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, |
| 304 | 0, "shortint", objfile); |
| 305 | break; |
| 306 | case FT_UNSIGNED_CHAR: |
| 307 | type = init_type (TYPE_CODE_INT, |
| 308 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, |
| 309 | TYPE_FLAG_UNSIGNED, "byte", objfile); |
| 310 | break; |
| 311 | case FT_SHORT: |
| 312 | type = init_type (TYPE_CODE_INT, |
| 313 | TARGET_SHORT_BIT / TARGET_CHAR_BIT, |
| 314 | 0, "integer", objfile); |
| 315 | break; |
| 316 | case FT_SIGNED_SHORT: |
| 317 | type = init_type (TYPE_CODE_INT, |
| 318 | TARGET_SHORT_BIT / TARGET_CHAR_BIT, |
| 319 | 0, "integer", objfile); /* FIXME-fnf */ |
| 320 | break; |
| 321 | case FT_UNSIGNED_SHORT: |
| 322 | type = init_type (TYPE_CODE_INT, |
| 323 | TARGET_SHORT_BIT / TARGET_CHAR_BIT, |
| 324 | TYPE_FLAG_UNSIGNED, "word", objfile); |
| 325 | break; |
| 326 | case FT_INTEGER: |
| 327 | type = init_type (TYPE_CODE_INT, |
| 328 | TARGET_INT_BIT / TARGET_CHAR_BIT, |
| 329 | 0, "longint", objfile); |
| 330 | break; |
| 331 | case FT_SIGNED_INTEGER: |
| 332 | type = init_type (TYPE_CODE_INT, |
| 333 | TARGET_INT_BIT / TARGET_CHAR_BIT, |
| 334 | 0, "longint", objfile); /* FIXME -fnf */ |
| 335 | break; |
| 336 | case FT_UNSIGNED_INTEGER: |
| 337 | type = init_type (TYPE_CODE_INT, |
| 338 | TARGET_INT_BIT / TARGET_CHAR_BIT, |
| 339 | TYPE_FLAG_UNSIGNED, "cardinal", objfile); |
| 340 | break; |
| 341 | case FT_LONG: |
| 342 | type = init_type (TYPE_CODE_INT, |
| 343 | TARGET_LONG_BIT / TARGET_CHAR_BIT, |
| 344 | 0, "long", objfile); |
| 345 | break; |
| 346 | case FT_SIGNED_LONG: |
| 347 | type = init_type (TYPE_CODE_INT, |
| 348 | TARGET_LONG_BIT / TARGET_CHAR_BIT, |
| 349 | 0, "long", objfile); /* FIXME -fnf */ |
| 350 | break; |
| 351 | case FT_UNSIGNED_LONG: |
| 352 | type = init_type (TYPE_CODE_INT, |
| 353 | TARGET_LONG_BIT / TARGET_CHAR_BIT, |
| 354 | TYPE_FLAG_UNSIGNED, "unsigned long", objfile); |
| 355 | break; |
| 356 | case FT_LONG_LONG: |
| 357 | type = init_type (TYPE_CODE_INT, |
| 358 | TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, |
| 359 | 0, "long long", objfile); |
| 360 | break; |
| 361 | case FT_SIGNED_LONG_LONG: |
| 362 | type = init_type (TYPE_CODE_INT, |
| 363 | TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, |
| 364 | 0, "signed long long", objfile); |
| 365 | break; |
| 366 | case FT_UNSIGNED_LONG_LONG: |
| 367 | type = init_type (TYPE_CODE_INT, |
| 368 | TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, |
| 369 | TYPE_FLAG_UNSIGNED, "unsigned long long", objfile); |
| 370 | break; |
| 371 | case FT_FLOAT: |
| 372 | type = init_type (TYPE_CODE_FLT, |
| 373 | TARGET_FLOAT_BIT / TARGET_CHAR_BIT, |
| 374 | 0, "float", objfile); |
| 375 | break; |
| 376 | case FT_DBL_PREC_FLOAT: |
| 377 | type = init_type (TYPE_CODE_FLT, |
| 378 | TARGET_DOUBLE_BIT / TARGET_CHAR_BIT, |
| 379 | 0, "double", objfile); |
| 380 | break; |
| 381 | case FT_EXT_PREC_FLOAT: |
| 382 | type = init_type (TYPE_CODE_FLT, |
| 383 | TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT, |
| 384 | 0, "extended", objfile); |
| 385 | break; |
| 386 | } |
| 387 | return (type); |
| 388 | } |
| 389 | \f |
| 390 | |
| 391 | /* Table mapping opcodes into strings for printing operators |
| 392 | and precedences of the operators. */ |
| 393 | |
| 394 | const struct op_print pascal_op_print_tab[] = |
| 395 | { |
| 396 | {",", BINOP_COMMA, PREC_COMMA, 0}, |
| 397 | {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, |
| 398 | {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, |
| 399 | {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, |
| 400 | {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, |
| 401 | {"=", BINOP_EQUAL, PREC_EQUAL, 0}, |
| 402 | {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0}, |
| 403 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, |
| 404 | {">=", BINOP_GEQ, PREC_ORDER, 0}, |
| 405 | {">", BINOP_GTR, PREC_ORDER, 0}, |
| 406 | {"<", BINOP_LESS, PREC_ORDER, 0}, |
| 407 | {"shr", BINOP_RSH, PREC_SHIFT, 0}, |
| 408 | {"shl", BINOP_LSH, PREC_SHIFT, 0}, |
| 409 | {"+", BINOP_ADD, PREC_ADD, 0}, |
| 410 | {"-", BINOP_SUB, PREC_ADD, 0}, |
| 411 | {"*", BINOP_MUL, PREC_MUL, 0}, |
| 412 | {"/", BINOP_DIV, PREC_MUL, 0}, |
| 413 | {"div", BINOP_INTDIV, PREC_MUL, 0}, |
| 414 | {"mod", BINOP_REM, PREC_MUL, 0}, |
| 415 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, |
| 416 | {"-", UNOP_NEG, PREC_PREFIX, 0}, |
| 417 | {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, |
| 418 | {"^", UNOP_IND, PREC_SUFFIX, 1}, |
| 419 | {"@", UNOP_ADDR, PREC_PREFIX, 0}, |
| 420 | {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0}, |
| 421 | {NULL, 0, 0, 0} |
| 422 | }; |
| 423 | \f |
| 424 | struct type **const (pascal_builtin_types[]) = |
| 425 | { |
| 426 | &builtin_type_int, |
| 427 | &builtin_type_long, |
| 428 | &builtin_type_short, |
| 429 | &builtin_type_char, |
| 430 | &builtin_type_float, |
| 431 | &builtin_type_double, |
| 432 | &builtin_type_void, |
| 433 | &builtin_type_long_long, |
| 434 | &builtin_type_signed_char, |
| 435 | &builtin_type_unsigned_char, |
| 436 | &builtin_type_unsigned_short, |
| 437 | &builtin_type_unsigned_int, |
| 438 | &builtin_type_unsigned_long, |
| 439 | &builtin_type_unsigned_long_long, |
| 440 | &builtin_type_long_double, |
| 441 | &builtin_type_complex, |
| 442 | &builtin_type_double_complex, |
| 443 | 0 |
| 444 | }; |
| 445 | |
| 446 | const struct language_defn pascal_language_defn = |
| 447 | { |
| 448 | "pascal", /* Language name */ |
| 449 | language_pascal, |
| 450 | pascal_builtin_types, |
| 451 | range_check_on, |
| 452 | type_check_on, |
| 453 | case_sensitive_on, |
| 454 | &exp_descriptor_standard, |
| 455 | pascal_parse, |
| 456 | pascal_error, |
| 457 | pascal_printchar, /* Print a character constant */ |
| 458 | pascal_printstr, /* Function to print string constant */ |
| 459 | pascal_emit_char, /* Print a single char */ |
| 460 | pascal_create_fundamental_type, /* Create fundamental type in this language */ |
| 461 | pascal_print_type, /* Print a type using appropriate syntax */ |
| 462 | pascal_val_print, /* Print a value using appropriate syntax */ |
| 463 | pascal_value_print, /* Print a top-level value */ |
| 464 | NULL, /* Language specific skip_trampoline */ |
| 465 | value_of_this, /* value_of_this */ |
| 466 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
| 467 | basic_lookup_transparent_type,/* lookup_transparent_type */ |
| 468 | NULL, /* Language specific symbol demangler */ |
| 469 | {"", "%", "b", ""}, /* Binary format info */ |
| 470 | {"0%lo", "0", "o", ""}, /* Octal format info */ |
| 471 | {"%ld", "", "d", ""}, /* Decimal format info */ |
| 472 | {"$%lx", "$", "x", ""}, /* Hex format info */ |
| 473 | pascal_op_print_tab, /* expression operators for printing */ |
| 474 | 1, /* c-style arrays */ |
| 475 | 0, /* String lower bound */ |
| 476 | &builtin_type_char, /* Type of string elements */ |
| 477 | default_word_break_characters, |
| 478 | LANG_MAGIC |
| 479 | }; |
| 480 | |
| 481 | void |
| 482 | _initialize_pascal_language (void) |
| 483 | { |
| 484 | add_language (&pascal_language_defn); |
| 485 | } |