| 1 | /* Fortran language support routines for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1993-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Motorola. Adapted from the C parser by Farooq Butt |
| 6 | (fmbutt@engage.sps.mot.com). |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "symtab.h" |
| 25 | #include "gdbtypes.h" |
| 26 | #include "expression.h" |
| 27 | #include "parser-defs.h" |
| 28 | #include "language.h" |
| 29 | #include "varobj.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "f-lang.h" |
| 32 | #include "valprint.h" |
| 33 | #include "value.h" |
| 34 | #include "cp-support.h" |
| 35 | #include "charset.h" |
| 36 | #include "c-lang.h" |
| 37 | #include "target-float.h" |
| 38 | |
| 39 | #include <math.h> |
| 40 | |
| 41 | /* Local functions */ |
| 42 | |
| 43 | static void f_printchar (int c, struct type *type, struct ui_file * stream); |
| 44 | static void f_emit_char (int c, struct type *type, |
| 45 | struct ui_file * stream, int quoter); |
| 46 | |
| 47 | /* Return the encoding that should be used for the character type |
| 48 | TYPE. */ |
| 49 | |
| 50 | static const char * |
| 51 | f_get_encoding (struct type *type) |
| 52 | { |
| 53 | const char *encoding; |
| 54 | |
| 55 | switch (TYPE_LENGTH (type)) |
| 56 | { |
| 57 | case 1: |
| 58 | encoding = target_charset (get_type_arch (type)); |
| 59 | break; |
| 60 | case 4: |
| 61 | if (gdbarch_byte_order (get_type_arch (type)) == BFD_ENDIAN_BIG) |
| 62 | encoding = "UTF-32BE"; |
| 63 | else |
| 64 | encoding = "UTF-32LE"; |
| 65 | break; |
| 66 | |
| 67 | default: |
| 68 | error (_("unrecognized character type")); |
| 69 | } |
| 70 | |
| 71 | return encoding; |
| 72 | } |
| 73 | |
| 74 | /* Print the character C on STREAM as part of the contents of a literal |
| 75 | string whose delimiter is QUOTER. Note that that format for printing |
| 76 | characters and strings is language specific. |
| 77 | FIXME: This is a copy of the same function from c-exp.y. It should |
| 78 | be replaced with a true F77 version. */ |
| 79 | |
| 80 | static void |
| 81 | f_emit_char (int c, struct type *type, struct ui_file *stream, int quoter) |
| 82 | { |
| 83 | const char *encoding = f_get_encoding (type); |
| 84 | |
| 85 | generic_emit_char (c, type, stream, quoter, encoding); |
| 86 | } |
| 87 | |
| 88 | /* Implementation of la_printchar. */ |
| 89 | |
| 90 | static void |
| 91 | f_printchar (int c, struct type *type, struct ui_file *stream) |
| 92 | { |
| 93 | fputs_filtered ("'", stream); |
| 94 | LA_EMIT_CHAR (c, type, stream, '\''); |
| 95 | fputs_filtered ("'", stream); |
| 96 | } |
| 97 | |
| 98 | /* Print the character string STRING, printing at most LENGTH characters. |
| 99 | Printing stops early if the number hits print_max; repeat counts |
| 100 | are printed as appropriate. Print ellipses at the end if we |
| 101 | had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. |
| 102 | FIXME: This is a copy of the same function from c-exp.y. It should |
| 103 | be replaced with a true F77 version. */ |
| 104 | |
| 105 | static void |
| 106 | f_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string, |
| 107 | unsigned int length, const char *encoding, int force_ellipses, |
| 108 | const struct value_print_options *options) |
| 109 | { |
| 110 | const char *type_encoding = f_get_encoding (type); |
| 111 | |
| 112 | if (TYPE_LENGTH (type) == 4) |
| 113 | fputs_filtered ("4_", stream); |
| 114 | |
| 115 | if (!encoding || !*encoding) |
| 116 | encoding = type_encoding; |
| 117 | |
| 118 | generic_printstr (stream, type, string, length, encoding, |
| 119 | force_ellipses, '\'', 0, options); |
| 120 | } |
| 121 | \f |
| 122 | |
| 123 | /* Table of operators and their precedences for printing expressions. */ |
| 124 | |
| 125 | static const struct op_print f_op_print_tab[] = |
| 126 | { |
| 127 | {"+", BINOP_ADD, PREC_ADD, 0}, |
| 128 | {"+", UNOP_PLUS, PREC_PREFIX, 0}, |
| 129 | {"-", BINOP_SUB, PREC_ADD, 0}, |
| 130 | {"-", UNOP_NEG, PREC_PREFIX, 0}, |
| 131 | {"*", BINOP_MUL, PREC_MUL, 0}, |
| 132 | {"/", BINOP_DIV, PREC_MUL, 0}, |
| 133 | {"DIV", BINOP_INTDIV, PREC_MUL, 0}, |
| 134 | {"MOD", BINOP_REM, PREC_MUL, 0}, |
| 135 | {"=", BINOP_ASSIGN, PREC_ASSIGN, 1}, |
| 136 | {".OR.", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, |
| 137 | {".AND.", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, |
| 138 | {".NOT.", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, |
| 139 | {".EQ.", BINOP_EQUAL, PREC_EQUAL, 0}, |
| 140 | {".NE.", BINOP_NOTEQUAL, PREC_EQUAL, 0}, |
| 141 | {".LE.", BINOP_LEQ, PREC_ORDER, 0}, |
| 142 | {".GE.", BINOP_GEQ, PREC_ORDER, 0}, |
| 143 | {".GT.", BINOP_GTR, PREC_ORDER, 0}, |
| 144 | {".LT.", BINOP_LESS, PREC_ORDER, 0}, |
| 145 | {"**", UNOP_IND, PREC_PREFIX, 0}, |
| 146 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, |
| 147 | {NULL, OP_NULL, PREC_REPEAT, 0} |
| 148 | }; |
| 149 | \f |
| 150 | enum f_primitive_types { |
| 151 | f_primitive_type_character, |
| 152 | f_primitive_type_logical, |
| 153 | f_primitive_type_logical_s1, |
| 154 | f_primitive_type_logical_s2, |
| 155 | f_primitive_type_logical_s8, |
| 156 | f_primitive_type_integer, |
| 157 | f_primitive_type_integer_s2, |
| 158 | f_primitive_type_real, |
| 159 | f_primitive_type_real_s8, |
| 160 | f_primitive_type_real_s16, |
| 161 | f_primitive_type_complex_s8, |
| 162 | f_primitive_type_complex_s16, |
| 163 | f_primitive_type_void, |
| 164 | nr_f_primitive_types |
| 165 | }; |
| 166 | |
| 167 | static void |
| 168 | f_language_arch_info (struct gdbarch *gdbarch, |
| 169 | struct language_arch_info *lai) |
| 170 | { |
| 171 | const struct builtin_f_type *builtin = builtin_f_type (gdbarch); |
| 172 | |
| 173 | lai->string_char_type = builtin->builtin_character; |
| 174 | lai->primitive_type_vector |
| 175 | = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_f_primitive_types + 1, |
| 176 | struct type *); |
| 177 | |
| 178 | lai->primitive_type_vector [f_primitive_type_character] |
| 179 | = builtin->builtin_character; |
| 180 | lai->primitive_type_vector [f_primitive_type_logical] |
| 181 | = builtin->builtin_logical; |
| 182 | lai->primitive_type_vector [f_primitive_type_logical_s1] |
| 183 | = builtin->builtin_logical_s1; |
| 184 | lai->primitive_type_vector [f_primitive_type_logical_s2] |
| 185 | = builtin->builtin_logical_s2; |
| 186 | lai->primitive_type_vector [f_primitive_type_logical_s8] |
| 187 | = builtin->builtin_logical_s8; |
| 188 | lai->primitive_type_vector [f_primitive_type_real] |
| 189 | = builtin->builtin_real; |
| 190 | lai->primitive_type_vector [f_primitive_type_real_s8] |
| 191 | = builtin->builtin_real_s8; |
| 192 | lai->primitive_type_vector [f_primitive_type_real_s16] |
| 193 | = builtin->builtin_real_s16; |
| 194 | lai->primitive_type_vector [f_primitive_type_complex_s8] |
| 195 | = builtin->builtin_complex_s8; |
| 196 | lai->primitive_type_vector [f_primitive_type_complex_s16] |
| 197 | = builtin->builtin_complex_s16; |
| 198 | lai->primitive_type_vector [f_primitive_type_void] |
| 199 | = builtin->builtin_void; |
| 200 | |
| 201 | lai->bool_type_symbol = "logical"; |
| 202 | lai->bool_type_default = builtin->builtin_logical_s2; |
| 203 | } |
| 204 | |
| 205 | /* Remove the modules separator :: from the default break list. */ |
| 206 | |
| 207 | static const char * |
| 208 | f_word_break_characters (void) |
| 209 | { |
| 210 | static char *retval; |
| 211 | |
| 212 | if (!retval) |
| 213 | { |
| 214 | char *s; |
| 215 | |
| 216 | retval = xstrdup (default_word_break_characters ()); |
| 217 | s = strchr (retval, ':'); |
| 218 | if (s) |
| 219 | { |
| 220 | char *last_char = &s[strlen (s) - 1]; |
| 221 | |
| 222 | *s = *last_char; |
| 223 | *last_char = 0; |
| 224 | } |
| 225 | } |
| 226 | return retval; |
| 227 | } |
| 228 | |
| 229 | /* Consider the modules separator :: as a valid symbol name character |
| 230 | class. */ |
| 231 | |
| 232 | static void |
| 233 | f_collect_symbol_completion_matches (completion_tracker &tracker, |
| 234 | complete_symbol_mode mode, |
| 235 | symbol_name_match_type compare_name, |
| 236 | const char *text, const char *word, |
| 237 | enum type_code code) |
| 238 | { |
| 239 | default_collect_symbol_completion_matches_break_on (tracker, mode, |
| 240 | compare_name, |
| 241 | text, word, ":", code); |
| 242 | } |
| 243 | |
| 244 | /* Special expression evaluation cases for Fortran. */ |
| 245 | struct value * |
| 246 | evaluate_subexp_f (struct type *expect_type, struct expression *exp, |
| 247 | int *pos, enum noside noside) |
| 248 | { |
| 249 | struct value *arg1 = NULL; |
| 250 | enum exp_opcode op; |
| 251 | int pc; |
| 252 | struct type *type; |
| 253 | |
| 254 | pc = *pos; |
| 255 | *pos += 1; |
| 256 | op = exp->elts[pc].opcode; |
| 257 | |
| 258 | switch (op) |
| 259 | { |
| 260 | default: |
| 261 | *pos -= 1; |
| 262 | return evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 263 | |
| 264 | case UNOP_ABS: |
| 265 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 266 | if (noside == EVAL_SKIP) |
| 267 | return eval_skip_value (exp); |
| 268 | type = value_type (arg1); |
| 269 | switch (TYPE_CODE (type)) |
| 270 | { |
| 271 | case TYPE_CODE_FLT: |
| 272 | { |
| 273 | double d |
| 274 | = fabs (target_float_to_host_double (value_contents (arg1), |
| 275 | value_type (arg1))); |
| 276 | return value_from_host_double (type, d); |
| 277 | } |
| 278 | case TYPE_CODE_INT: |
| 279 | { |
| 280 | LONGEST l = value_as_long (arg1); |
| 281 | l = llabs (l); |
| 282 | return value_from_longest (type, l); |
| 283 | } |
| 284 | } |
| 285 | error (_("ABS of type %s not supported"), TYPE_SAFE_NAME (type)); |
| 286 | |
| 287 | case UNOP_KIND: |
| 288 | arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 289 | type = value_type (arg1); |
| 290 | |
| 291 | switch (TYPE_CODE (type)) |
| 292 | { |
| 293 | case TYPE_CODE_STRUCT: |
| 294 | case TYPE_CODE_UNION: |
| 295 | case TYPE_CODE_MODULE: |
| 296 | case TYPE_CODE_FUNC: |
| 297 | error (_("argument to kind must be an intrinsic type")); |
| 298 | } |
| 299 | |
| 300 | if (!TYPE_TARGET_TYPE (type)) |
| 301 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, |
| 302 | TYPE_LENGTH (type)); |
| 303 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, |
| 304 | TYPE_LENGTH (TYPE_TARGET_TYPE(type))); |
| 305 | } |
| 306 | |
| 307 | /* Should be unreachable. */ |
| 308 | return nullptr; |
| 309 | } |
| 310 | |
| 311 | static const char *f_extensions[] = |
| 312 | { |
| 313 | ".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP", |
| 314 | ".f90", ".F90", ".f95", ".F95", ".f03", ".F03", ".f08", ".F08", |
| 315 | NULL |
| 316 | }; |
| 317 | |
| 318 | /* Expression processing for Fortran. */ |
| 319 | static const struct exp_descriptor exp_descriptor_f = |
| 320 | { |
| 321 | print_subexp_standard, |
| 322 | operator_length_standard, |
| 323 | operator_check_standard, |
| 324 | op_name_standard, |
| 325 | dump_subexp_body_standard, |
| 326 | evaluate_subexp_f |
| 327 | }; |
| 328 | |
| 329 | extern const struct language_defn f_language_defn = |
| 330 | { |
| 331 | "fortran", |
| 332 | "Fortran", |
| 333 | language_fortran, |
| 334 | range_check_on, |
| 335 | case_sensitive_off, |
| 336 | array_column_major, |
| 337 | macro_expansion_no, |
| 338 | f_extensions, |
| 339 | &exp_descriptor_f, |
| 340 | f_parse, /* parser */ |
| 341 | null_post_parser, |
| 342 | f_printchar, /* Print character constant */ |
| 343 | f_printstr, /* function to print string constant */ |
| 344 | f_emit_char, /* Function to print a single character */ |
| 345 | f_print_type, /* Print a type using appropriate syntax */ |
| 346 | default_print_typedef, /* Print a typedef using appropriate syntax */ |
| 347 | f_val_print, /* Print a value using appropriate syntax */ |
| 348 | c_value_print, /* FIXME */ |
| 349 | default_read_var_value, /* la_read_var_value */ |
| 350 | NULL, /* Language specific skip_trampoline */ |
| 351 | NULL, /* name_of_this */ |
| 352 | false, /* la_store_sym_names_in_linkage_form_p */ |
| 353 | cp_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
| 354 | basic_lookup_transparent_type,/* lookup_transparent_type */ |
| 355 | |
| 356 | /* We could support demangling here to provide module namespaces |
| 357 | also for inferiors with only minimal symbol table (ELF symbols). |
| 358 | Just the mangling standard is not standardized across compilers |
| 359 | and there is no DW_AT_producer available for inferiors with only |
| 360 | the ELF symbols to check the mangling kind. */ |
| 361 | NULL, /* Language specific symbol demangler */ |
| 362 | NULL, |
| 363 | NULL, /* Language specific |
| 364 | class_name_from_physname */ |
| 365 | f_op_print_tab, /* expression operators for printing */ |
| 366 | 0, /* arrays are first-class (not c-style) */ |
| 367 | 1, /* String lower bound */ |
| 368 | f_word_break_characters, |
| 369 | f_collect_symbol_completion_matches, |
| 370 | f_language_arch_info, |
| 371 | default_print_array_index, |
| 372 | default_pass_by_reference, |
| 373 | default_get_string, |
| 374 | c_watch_location_expression, |
| 375 | NULL, /* la_get_symbol_name_matcher */ |
| 376 | iterate_over_symbols, |
| 377 | default_search_name_hash, |
| 378 | &default_varobj_ops, |
| 379 | NULL, |
| 380 | NULL, |
| 381 | LANG_MAGIC |
| 382 | }; |
| 383 | |
| 384 | static void * |
| 385 | build_fortran_types (struct gdbarch *gdbarch) |
| 386 | { |
| 387 | struct builtin_f_type *builtin_f_type |
| 388 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_f_type); |
| 389 | |
| 390 | builtin_f_type->builtin_void |
| 391 | = arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT, "VOID"); |
| 392 | |
| 393 | builtin_f_type->builtin_character |
| 394 | = arch_type (gdbarch, TYPE_CODE_CHAR, TARGET_CHAR_BIT, "character"); |
| 395 | |
| 396 | builtin_f_type->builtin_logical_s1 |
| 397 | = arch_boolean_type (gdbarch, TARGET_CHAR_BIT, 1, "logical*1"); |
| 398 | |
| 399 | builtin_f_type->builtin_integer_s2 |
| 400 | = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), 0, |
| 401 | "integer*2"); |
| 402 | |
| 403 | builtin_f_type->builtin_integer_s8 |
| 404 | = arch_integer_type (gdbarch, gdbarch_long_long_bit (gdbarch), 0, |
| 405 | "integer*8"); |
| 406 | |
| 407 | builtin_f_type->builtin_logical_s2 |
| 408 | = arch_boolean_type (gdbarch, gdbarch_short_bit (gdbarch), 1, |
| 409 | "logical*2"); |
| 410 | |
| 411 | builtin_f_type->builtin_logical_s8 |
| 412 | = arch_boolean_type (gdbarch, gdbarch_long_long_bit (gdbarch), 1, |
| 413 | "logical*8"); |
| 414 | |
| 415 | builtin_f_type->builtin_integer |
| 416 | = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, |
| 417 | "integer"); |
| 418 | |
| 419 | builtin_f_type->builtin_logical |
| 420 | = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, |
| 421 | "logical*4"); |
| 422 | |
| 423 | builtin_f_type->builtin_real |
| 424 | = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), |
| 425 | "real", gdbarch_float_format (gdbarch)); |
| 426 | builtin_f_type->builtin_real_s8 |
| 427 | = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch), |
| 428 | "real*8", gdbarch_double_format (gdbarch)); |
| 429 | builtin_f_type->builtin_real_s16 |
| 430 | = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch), |
| 431 | "real*16", gdbarch_long_double_format (gdbarch)); |
| 432 | |
| 433 | builtin_f_type->builtin_complex_s8 |
| 434 | = arch_complex_type (gdbarch, "complex*8", |
| 435 | builtin_f_type->builtin_real); |
| 436 | builtin_f_type->builtin_complex_s16 |
| 437 | = arch_complex_type (gdbarch, "complex*16", |
| 438 | builtin_f_type->builtin_real_s8); |
| 439 | builtin_f_type->builtin_complex_s32 |
| 440 | = arch_complex_type (gdbarch, "complex*32", |
| 441 | builtin_f_type->builtin_real_s16); |
| 442 | |
| 443 | return builtin_f_type; |
| 444 | } |
| 445 | |
| 446 | static struct gdbarch_data *f_type_data; |
| 447 | |
| 448 | const struct builtin_f_type * |
| 449 | builtin_f_type (struct gdbarch *gdbarch) |
| 450 | { |
| 451 | return (const struct builtin_f_type *) gdbarch_data (gdbarch, f_type_data); |
| 452 | } |
| 453 | |
| 454 | void |
| 455 | _initialize_f_language (void) |
| 456 | { |
| 457 | f_type_data = gdbarch_data_register_post_init (build_fortran_types); |
| 458 | } |
| 459 | |
| 460 | /* See f-lang.h. */ |
| 461 | |
| 462 | struct value * |
| 463 | fortran_argument_convert (struct value *value, bool is_artificial) |
| 464 | { |
| 465 | if (!is_artificial) |
| 466 | { |
| 467 | /* If the value is not in the inferior e.g. registers values, |
| 468 | convenience variables and user input. */ |
| 469 | if (VALUE_LVAL (value) != lval_memory) |
| 470 | { |
| 471 | struct type *type = value_type (value); |
| 472 | const int length = TYPE_LENGTH (type); |
| 473 | const CORE_ADDR addr |
| 474 | = value_as_long (value_allocate_space_in_inferior (length)); |
| 475 | write_memory (addr, value_contents (value), length); |
| 476 | struct value *val |
| 477 | = value_from_contents_and_address (type, value_contents (value), |
| 478 | addr); |
| 479 | return value_addr (val); |
| 480 | } |
| 481 | else |
| 482 | return value_addr (value); /* Program variables, e.g. arrays. */ |
| 483 | } |
| 484 | return value; |
| 485 | } |
| 486 | |
| 487 | /* See f-lang.h. */ |
| 488 | |
| 489 | struct type * |
| 490 | fortran_preserve_arg_pointer (struct value *arg, struct type *type) |
| 491 | { |
| 492 | if (TYPE_CODE (value_type (arg)) == TYPE_CODE_PTR) |
| 493 | return value_type (arg); |
| 494 | return type; |
| 495 | } |