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