| 1 | /* Print values for GNU debugger GDB. |
| 2 | |
| 3 | Copyright (C) 1986-2019 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 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "symtab.h" |
| 23 | #include "gdbtypes.h" |
| 24 | #include "value.h" |
| 25 | #include "language.h" |
| 26 | #include "c-lang.h" |
| 27 | #include "expression.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "target.h" |
| 31 | #include "breakpoint.h" |
| 32 | #include "demangle.h" |
| 33 | #include "gdb-demangle.h" |
| 34 | #include "valprint.h" |
| 35 | #include "annotate.h" |
| 36 | #include "symfile.h" /* for overlay functions */ |
| 37 | #include "objfiles.h" /* ditto */ |
| 38 | #include "completer.h" /* for completion functions */ |
| 39 | #include "ui-out.h" |
| 40 | #include "block.h" |
| 41 | #include "disasm.h" |
| 42 | #include "target-float.h" |
| 43 | #include "observable.h" |
| 44 | #include "solist.h" |
| 45 | #include "parser-defs.h" |
| 46 | #include "charset.h" |
| 47 | #include "arch-utils.h" |
| 48 | #include "cli/cli-utils.h" |
| 49 | #include "cli/cli-option.h" |
| 50 | #include "cli/cli-script.h" |
| 51 | #include "cli/cli-style.h" |
| 52 | #include "gdbsupport/format.h" |
| 53 | #include "source.h" |
| 54 | #include "gdbsupport/byte-vector.h" |
| 55 | #include "gdbsupport/gdb_optional.h" |
| 56 | |
| 57 | /* Last specified output format. */ |
| 58 | |
| 59 | static char last_format = 0; |
| 60 | |
| 61 | /* Last specified examination size. 'b', 'h', 'w' or `q'. */ |
| 62 | |
| 63 | static char last_size = 'w'; |
| 64 | |
| 65 | /* Last specified count for the 'x' command. */ |
| 66 | |
| 67 | static int last_count; |
| 68 | |
| 69 | /* Default address to examine next, and associated architecture. */ |
| 70 | |
| 71 | static struct gdbarch *next_gdbarch; |
| 72 | static CORE_ADDR next_address; |
| 73 | |
| 74 | /* Number of delay instructions following current disassembled insn. */ |
| 75 | |
| 76 | static int branch_delay_insns; |
| 77 | |
| 78 | /* Last address examined. */ |
| 79 | |
| 80 | static CORE_ADDR last_examine_address; |
| 81 | |
| 82 | /* Contents of last address examined. |
| 83 | This is not valid past the end of the `x' command! */ |
| 84 | |
| 85 | static value_ref_ptr last_examine_value; |
| 86 | |
| 87 | /* Largest offset between a symbolic value and an address, that will be |
| 88 | printed as `0x1234 <symbol+offset>'. */ |
| 89 | |
| 90 | static unsigned int max_symbolic_offset = UINT_MAX; |
| 91 | static void |
| 92 | show_max_symbolic_offset (struct ui_file *file, int from_tty, |
| 93 | struct cmd_list_element *c, const char *value) |
| 94 | { |
| 95 | fprintf_filtered (file, |
| 96 | _("The largest offset that will be " |
| 97 | "printed in <symbol+1234> form is %s.\n"), |
| 98 | value); |
| 99 | } |
| 100 | |
| 101 | /* Append the source filename and linenumber of the symbol when |
| 102 | printing a symbolic value as `<symbol at filename:linenum>' if set. */ |
| 103 | static bool print_symbol_filename = false; |
| 104 | static void |
| 105 | show_print_symbol_filename (struct ui_file *file, int from_tty, |
| 106 | struct cmd_list_element *c, const char *value) |
| 107 | { |
| 108 | fprintf_filtered (file, _("Printing of source filename and " |
| 109 | "line number with <symbol> is %s.\n"), |
| 110 | value); |
| 111 | } |
| 112 | |
| 113 | /* Number of auto-display expression currently being displayed. |
| 114 | So that we can disable it if we get a signal within it. |
| 115 | -1 when not doing one. */ |
| 116 | |
| 117 | static int current_display_number; |
| 118 | |
| 119 | struct display |
| 120 | { |
| 121 | /* Chain link to next auto-display item. */ |
| 122 | struct display *next; |
| 123 | |
| 124 | /* The expression as the user typed it. */ |
| 125 | char *exp_string; |
| 126 | |
| 127 | /* Expression to be evaluated and displayed. */ |
| 128 | expression_up exp; |
| 129 | |
| 130 | /* Item number of this auto-display item. */ |
| 131 | int number; |
| 132 | |
| 133 | /* Display format specified. */ |
| 134 | struct format_data format; |
| 135 | |
| 136 | /* Program space associated with `block'. */ |
| 137 | struct program_space *pspace; |
| 138 | |
| 139 | /* Innermost block required by this expression when evaluated. */ |
| 140 | const struct block *block; |
| 141 | |
| 142 | /* Status of this display (enabled or disabled). */ |
| 143 | int enabled_p; |
| 144 | }; |
| 145 | |
| 146 | /* Chain of expressions whose values should be displayed |
| 147 | automatically each time the program stops. */ |
| 148 | |
| 149 | static struct display *display_chain; |
| 150 | |
| 151 | static int display_number; |
| 152 | |
| 153 | /* Walk the following statement or block through all displays. |
| 154 | ALL_DISPLAYS_SAFE does so even if the statement deletes the current |
| 155 | display. */ |
| 156 | |
| 157 | #define ALL_DISPLAYS(B) \ |
| 158 | for (B = display_chain; B; B = B->next) |
| 159 | |
| 160 | #define ALL_DISPLAYS_SAFE(B,TMP) \ |
| 161 | for (B = display_chain; \ |
| 162 | B ? (TMP = B->next, 1): 0; \ |
| 163 | B = TMP) |
| 164 | |
| 165 | /* Prototypes for local functions. */ |
| 166 | |
| 167 | static void do_one_display (struct display *); |
| 168 | \f |
| 169 | |
| 170 | /* Decode a format specification. *STRING_PTR should point to it. |
| 171 | OFORMAT and OSIZE are used as defaults for the format and size |
| 172 | if none are given in the format specification. |
| 173 | If OSIZE is zero, then the size field of the returned value |
| 174 | should be set only if a size is explicitly specified by the |
| 175 | user. |
| 176 | The structure returned describes all the data |
| 177 | found in the specification. In addition, *STRING_PTR is advanced |
| 178 | past the specification and past all whitespace following it. */ |
| 179 | |
| 180 | static struct format_data |
| 181 | decode_format (const char **string_ptr, int oformat, int osize) |
| 182 | { |
| 183 | struct format_data val; |
| 184 | const char *p = *string_ptr; |
| 185 | |
| 186 | val.format = '?'; |
| 187 | val.size = '?'; |
| 188 | val.count = 1; |
| 189 | val.raw = 0; |
| 190 | |
| 191 | if (*p == '-') |
| 192 | { |
| 193 | val.count = -1; |
| 194 | p++; |
| 195 | } |
| 196 | if (*p >= '0' && *p <= '9') |
| 197 | val.count *= atoi (p); |
| 198 | while (*p >= '0' && *p <= '9') |
| 199 | p++; |
| 200 | |
| 201 | /* Now process size or format letters that follow. */ |
| 202 | |
| 203 | while (1) |
| 204 | { |
| 205 | if (*p == 'b' || *p == 'h' || *p == 'w' || *p == 'g') |
| 206 | val.size = *p++; |
| 207 | else if (*p == 'r') |
| 208 | { |
| 209 | val.raw = 1; |
| 210 | p++; |
| 211 | } |
| 212 | else if (*p >= 'a' && *p <= 'z') |
| 213 | val.format = *p++; |
| 214 | else |
| 215 | break; |
| 216 | } |
| 217 | |
| 218 | *string_ptr = skip_spaces (p); |
| 219 | |
| 220 | /* Set defaults for format and size if not specified. */ |
| 221 | if (val.format == '?') |
| 222 | { |
| 223 | if (val.size == '?') |
| 224 | { |
| 225 | /* Neither has been specified. */ |
| 226 | val.format = oformat; |
| 227 | val.size = osize; |
| 228 | } |
| 229 | else |
| 230 | /* If a size is specified, any format makes a reasonable |
| 231 | default except 'i'. */ |
| 232 | val.format = oformat == 'i' ? 'x' : oformat; |
| 233 | } |
| 234 | else if (val.size == '?') |
| 235 | switch (val.format) |
| 236 | { |
| 237 | case 'a': |
| 238 | /* Pick the appropriate size for an address. This is deferred |
| 239 | until do_examine when we know the actual architecture to use. |
| 240 | A special size value of 'a' is used to indicate this case. */ |
| 241 | val.size = osize ? 'a' : osize; |
| 242 | break; |
| 243 | case 'f': |
| 244 | /* Floating point has to be word or giantword. */ |
| 245 | if (osize == 'w' || osize == 'g') |
| 246 | val.size = osize; |
| 247 | else |
| 248 | /* Default it to giantword if the last used size is not |
| 249 | appropriate. */ |
| 250 | val.size = osize ? 'g' : osize; |
| 251 | break; |
| 252 | case 'c': |
| 253 | /* Characters default to one byte. */ |
| 254 | val.size = osize ? 'b' : osize; |
| 255 | break; |
| 256 | case 's': |
| 257 | /* Display strings with byte size chars unless explicitly |
| 258 | specified. */ |
| 259 | val.size = '\0'; |
| 260 | break; |
| 261 | |
| 262 | default: |
| 263 | /* The default is the size most recently specified. */ |
| 264 | val.size = osize; |
| 265 | } |
| 266 | |
| 267 | return val; |
| 268 | } |
| 269 | \f |
| 270 | /* Print value VAL on stream according to OPTIONS. |
| 271 | Do not end with a newline. |
| 272 | SIZE is the letter for the size of datum being printed. |
| 273 | This is used to pad hex numbers so they line up. SIZE is 0 |
| 274 | for print / output and set for examine. */ |
| 275 | |
| 276 | static void |
| 277 | print_formatted (struct value *val, int size, |
| 278 | const struct value_print_options *options, |
| 279 | struct ui_file *stream) |
| 280 | { |
| 281 | struct type *type = check_typedef (value_type (val)); |
| 282 | int len = TYPE_LENGTH (type); |
| 283 | |
| 284 | if (VALUE_LVAL (val) == lval_memory) |
| 285 | next_address = value_address (val) + len; |
| 286 | |
| 287 | if (size) |
| 288 | { |
| 289 | switch (options->format) |
| 290 | { |
| 291 | case 's': |
| 292 | { |
| 293 | struct type *elttype = value_type (val); |
| 294 | |
| 295 | next_address = (value_address (val) |
| 296 | + val_print_string (elttype, NULL, |
| 297 | value_address (val), -1, |
| 298 | stream, options) * len); |
| 299 | } |
| 300 | return; |
| 301 | |
| 302 | case 'i': |
| 303 | /* We often wrap here if there are long symbolic names. */ |
| 304 | wrap_here (" "); |
| 305 | next_address = (value_address (val) |
| 306 | + gdb_print_insn (get_type_arch (type), |
| 307 | value_address (val), stream, |
| 308 | &branch_delay_insns)); |
| 309 | return; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | if (options->format == 0 || options->format == 's' |
| 314 | || TYPE_CODE (type) == TYPE_CODE_REF |
| 315 | || TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 316 | || TYPE_CODE (type) == TYPE_CODE_STRING |
| 317 | || TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 318 | || TYPE_CODE (type) == TYPE_CODE_UNION |
| 319 | || TYPE_CODE (type) == TYPE_CODE_NAMESPACE) |
| 320 | value_print (val, stream, options); |
| 321 | else |
| 322 | /* User specified format, so don't look to the type to tell us |
| 323 | what to do. */ |
| 324 | val_print_scalar_formatted (type, |
| 325 | value_embedded_offset (val), |
| 326 | val, |
| 327 | options, size, stream); |
| 328 | } |
| 329 | |
| 330 | /* Return builtin floating point type of same length as TYPE. |
| 331 | If no such type is found, return TYPE itself. */ |
| 332 | static struct type * |
| 333 | float_type_from_length (struct type *type) |
| 334 | { |
| 335 | struct gdbarch *gdbarch = get_type_arch (type); |
| 336 | const struct builtin_type *builtin = builtin_type (gdbarch); |
| 337 | |
| 338 | if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_float)) |
| 339 | type = builtin->builtin_float; |
| 340 | else if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_double)) |
| 341 | type = builtin->builtin_double; |
| 342 | else if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_long_double)) |
| 343 | type = builtin->builtin_long_double; |
| 344 | |
| 345 | return type; |
| 346 | } |
| 347 | |
| 348 | /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR, |
| 349 | according to OPTIONS and SIZE on STREAM. Formats s and i are not |
| 350 | supported at this level. */ |
| 351 | |
| 352 | void |
| 353 | print_scalar_formatted (const gdb_byte *valaddr, struct type *type, |
| 354 | const struct value_print_options *options, |
| 355 | int size, struct ui_file *stream) |
| 356 | { |
| 357 | struct gdbarch *gdbarch = get_type_arch (type); |
| 358 | unsigned int len = TYPE_LENGTH (type); |
| 359 | enum bfd_endian byte_order = type_byte_order (type); |
| 360 | |
| 361 | /* String printing should go through val_print_scalar_formatted. */ |
| 362 | gdb_assert (options->format != 's'); |
| 363 | |
| 364 | /* If the value is a pointer, and pointers and addresses are not the |
| 365 | same, then at this point, the value's length (in target bytes) is |
| 366 | gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */ |
| 367 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 368 | len = gdbarch_addr_bit (gdbarch) / TARGET_CHAR_BIT; |
| 369 | |
| 370 | /* If we are printing it as unsigned, truncate it in case it is actually |
| 371 | a negative signed value (e.g. "print/u (short)-1" should print 65535 |
| 372 | (if shorts are 16 bits) instead of 4294967295). */ |
| 373 | if (options->format != 'c' |
| 374 | && (options->format != 'd' || TYPE_UNSIGNED (type))) |
| 375 | { |
| 376 | if (len < TYPE_LENGTH (type) && byte_order == BFD_ENDIAN_BIG) |
| 377 | valaddr += TYPE_LENGTH (type) - len; |
| 378 | } |
| 379 | |
| 380 | if (size != 0 && (options->format == 'x' || options->format == 't')) |
| 381 | { |
| 382 | /* Truncate to fit. */ |
| 383 | unsigned newlen; |
| 384 | switch (size) |
| 385 | { |
| 386 | case 'b': |
| 387 | newlen = 1; |
| 388 | break; |
| 389 | case 'h': |
| 390 | newlen = 2; |
| 391 | break; |
| 392 | case 'w': |
| 393 | newlen = 4; |
| 394 | break; |
| 395 | case 'g': |
| 396 | newlen = 8; |
| 397 | break; |
| 398 | default: |
| 399 | error (_("Undefined output size \"%c\"."), size); |
| 400 | } |
| 401 | if (newlen < len && byte_order == BFD_ENDIAN_BIG) |
| 402 | valaddr += len - newlen; |
| 403 | len = newlen; |
| 404 | } |
| 405 | |
| 406 | /* Historically gdb has printed floats by first casting them to a |
| 407 | long, and then printing the long. PR cli/16242 suggests changing |
| 408 | this to using C-style hex float format. |
| 409 | |
| 410 | Biased range types must also be unbiased here; the unbiasing is |
| 411 | done by unpack_long. */ |
| 412 | gdb::byte_vector converted_bytes; |
| 413 | /* Some cases below will unpack the value again. In the biased |
| 414 | range case, we want to avoid this, so we store the unpacked value |
| 415 | here for possible use later. */ |
| 416 | gdb::optional<LONGEST> val_long; |
| 417 | if ((TYPE_CODE (type) == TYPE_CODE_FLT |
| 418 | && (options->format == 'o' |
| 419 | || options->format == 'x' |
| 420 | || options->format == 't' |
| 421 | || options->format == 'z' |
| 422 | || options->format == 'd' |
| 423 | || options->format == 'u')) |
| 424 | || (TYPE_CODE (type) == TYPE_CODE_RANGE |
| 425 | && TYPE_RANGE_DATA (type)->bias != 0)) |
| 426 | { |
| 427 | val_long.emplace (unpack_long (type, valaddr)); |
| 428 | converted_bytes.resize (TYPE_LENGTH (type)); |
| 429 | store_signed_integer (converted_bytes.data (), TYPE_LENGTH (type), |
| 430 | byte_order, *val_long); |
| 431 | valaddr = converted_bytes.data (); |
| 432 | } |
| 433 | |
| 434 | /* Printing a non-float type as 'f' will interpret the data as if it were |
| 435 | of a floating-point type of the same length, if that exists. Otherwise, |
| 436 | the data is printed as integer. */ |
| 437 | char format = options->format; |
| 438 | if (format == 'f' && TYPE_CODE (type) != TYPE_CODE_FLT) |
| 439 | { |
| 440 | type = float_type_from_length (type); |
| 441 | if (TYPE_CODE (type) != TYPE_CODE_FLT) |
| 442 | format = 0; |
| 443 | } |
| 444 | |
| 445 | switch (format) |
| 446 | { |
| 447 | case 'o': |
| 448 | print_octal_chars (stream, valaddr, len, byte_order); |
| 449 | break; |
| 450 | case 'd': |
| 451 | print_decimal_chars (stream, valaddr, len, true, byte_order); |
| 452 | break; |
| 453 | case 'u': |
| 454 | print_decimal_chars (stream, valaddr, len, false, byte_order); |
| 455 | break; |
| 456 | case 0: |
| 457 | if (TYPE_CODE (type) != TYPE_CODE_FLT) |
| 458 | { |
| 459 | print_decimal_chars (stream, valaddr, len, !TYPE_UNSIGNED (type), |
| 460 | byte_order); |
| 461 | break; |
| 462 | } |
| 463 | /* FALLTHROUGH */ |
| 464 | case 'f': |
| 465 | print_floating (valaddr, type, stream); |
| 466 | break; |
| 467 | |
| 468 | case 't': |
| 469 | print_binary_chars (stream, valaddr, len, byte_order, size > 0); |
| 470 | break; |
| 471 | case 'x': |
| 472 | print_hex_chars (stream, valaddr, len, byte_order, size > 0); |
| 473 | break; |
| 474 | case 'z': |
| 475 | print_hex_chars (stream, valaddr, len, byte_order, true); |
| 476 | break; |
| 477 | case 'c': |
| 478 | { |
| 479 | struct value_print_options opts = *options; |
| 480 | |
| 481 | if (!val_long.has_value ()) |
| 482 | val_long.emplace (unpack_long (type, valaddr)); |
| 483 | |
| 484 | opts.format = 0; |
| 485 | if (TYPE_UNSIGNED (type)) |
| 486 | type = builtin_type (gdbarch)->builtin_true_unsigned_char; |
| 487 | else |
| 488 | type = builtin_type (gdbarch)->builtin_true_char; |
| 489 | |
| 490 | value_print (value_from_longest (type, *val_long), stream, &opts); |
| 491 | } |
| 492 | break; |
| 493 | |
| 494 | case 'a': |
| 495 | { |
| 496 | if (!val_long.has_value ()) |
| 497 | val_long.emplace (unpack_long (type, valaddr)); |
| 498 | print_address (gdbarch, *val_long, stream); |
| 499 | } |
| 500 | break; |
| 501 | |
| 502 | default: |
| 503 | error (_("Undefined output format \"%c\"."), format); |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | /* Specify default address for `x' command. |
| 508 | The `info lines' command uses this. */ |
| 509 | |
| 510 | void |
| 511 | set_next_address (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 512 | { |
| 513 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
| 514 | |
| 515 | next_gdbarch = gdbarch; |
| 516 | next_address = addr; |
| 517 | |
| 518 | /* Make address available to the user as $_. */ |
| 519 | set_internalvar (lookup_internalvar ("_"), |
| 520 | value_from_pointer (ptr_type, addr)); |
| 521 | } |
| 522 | |
| 523 | /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM, |
| 524 | after LEADIN. Print nothing if no symbolic name is found nearby. |
| 525 | Optionally also print source file and line number, if available. |
| 526 | DO_DEMANGLE controls whether to print a symbol in its native "raw" form, |
| 527 | or to interpret it as a possible C++ name and convert it back to source |
| 528 | form. However note that DO_DEMANGLE can be overridden by the specific |
| 529 | settings of the demangle and asm_demangle variables. Returns |
| 530 | non-zero if anything was printed; zero otherwise. */ |
| 531 | |
| 532 | int |
| 533 | print_address_symbolic (struct gdbarch *gdbarch, CORE_ADDR addr, |
| 534 | struct ui_file *stream, |
| 535 | int do_demangle, const char *leadin) |
| 536 | { |
| 537 | std::string name, filename; |
| 538 | int unmapped = 0; |
| 539 | int offset = 0; |
| 540 | int line = 0; |
| 541 | |
| 542 | if (build_address_symbolic (gdbarch, addr, do_demangle, false, &name, |
| 543 | &offset, &filename, &line, &unmapped)) |
| 544 | return 0; |
| 545 | |
| 546 | fputs_filtered (leadin, stream); |
| 547 | if (unmapped) |
| 548 | fputs_filtered ("<*", stream); |
| 549 | else |
| 550 | fputs_filtered ("<", stream); |
| 551 | fputs_styled (name.c_str (), function_name_style.style (), stream); |
| 552 | if (offset != 0) |
| 553 | fprintf_filtered (stream, "%+d", offset); |
| 554 | |
| 555 | /* Append source filename and line number if desired. Give specific |
| 556 | line # of this addr, if we have it; else line # of the nearest symbol. */ |
| 557 | if (print_symbol_filename && !filename.empty ()) |
| 558 | { |
| 559 | fputs_filtered (line == -1 ? " in " : " at ", stream); |
| 560 | fputs_styled (filename.c_str (), file_name_style.style (), stream); |
| 561 | if (line != -1) |
| 562 | fprintf_filtered (stream, ":%d", line); |
| 563 | } |
| 564 | if (unmapped) |
| 565 | fputs_filtered ("*>", stream); |
| 566 | else |
| 567 | fputs_filtered (">", stream); |
| 568 | |
| 569 | return 1; |
| 570 | } |
| 571 | |
| 572 | /* See valprint.h. */ |
| 573 | |
| 574 | int |
| 575 | build_address_symbolic (struct gdbarch *gdbarch, |
| 576 | CORE_ADDR addr, /* IN */ |
| 577 | bool do_demangle, /* IN */ |
| 578 | bool prefer_sym_over_minsym, /* IN */ |
| 579 | std::string *name, /* OUT */ |
| 580 | int *offset, /* OUT */ |
| 581 | std::string *filename, /* OUT */ |
| 582 | int *line, /* OUT */ |
| 583 | int *unmapped) /* OUT */ |
| 584 | { |
| 585 | struct bound_minimal_symbol msymbol; |
| 586 | struct symbol *symbol; |
| 587 | CORE_ADDR name_location = 0; |
| 588 | struct obj_section *section = NULL; |
| 589 | const char *name_temp = ""; |
| 590 | |
| 591 | /* Let's say it is mapped (not unmapped). */ |
| 592 | *unmapped = 0; |
| 593 | |
| 594 | /* Determine if the address is in an overlay, and whether it is |
| 595 | mapped. */ |
| 596 | if (overlay_debugging) |
| 597 | { |
| 598 | section = find_pc_overlay (addr); |
| 599 | if (pc_in_unmapped_range (addr, section)) |
| 600 | { |
| 601 | *unmapped = 1; |
| 602 | addr = overlay_mapped_address (addr, section); |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | /* Try to find the address in both the symbol table and the minsyms. |
| 607 | In most cases, we'll prefer to use the symbol instead of the |
| 608 | minsym. However, there are cases (see below) where we'll choose |
| 609 | to use the minsym instead. */ |
| 610 | |
| 611 | /* This is defective in the sense that it only finds text symbols. So |
| 612 | really this is kind of pointless--we should make sure that the |
| 613 | minimal symbols have everything we need (by changing that we could |
| 614 | save some memory, but for many debug format--ELF/DWARF or |
| 615 | anything/stabs--it would be inconvenient to eliminate those minimal |
| 616 | symbols anyway). */ |
| 617 | msymbol = lookup_minimal_symbol_by_pc_section (addr, section); |
| 618 | symbol = find_pc_sect_function (addr, section); |
| 619 | |
| 620 | if (symbol) |
| 621 | { |
| 622 | /* If this is a function (i.e. a code address), strip out any |
| 623 | non-address bits. For instance, display a pointer to the |
| 624 | first instruction of a Thumb function as <function>; the |
| 625 | second instruction will be <function+2>, even though the |
| 626 | pointer is <function+3>. This matches the ISA behavior. */ |
| 627 | addr = gdbarch_addr_bits_remove (gdbarch, addr); |
| 628 | |
| 629 | name_location = BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (symbol)); |
| 630 | if (do_demangle || asm_demangle) |
| 631 | name_temp = symbol->print_name (); |
| 632 | else |
| 633 | name_temp = symbol->linkage_name (); |
| 634 | } |
| 635 | |
| 636 | if (msymbol.minsym != NULL |
| 637 | && MSYMBOL_HAS_SIZE (msymbol.minsym) |
| 638 | && MSYMBOL_SIZE (msymbol.minsym) == 0 |
| 639 | && MSYMBOL_TYPE (msymbol.minsym) != mst_text |
| 640 | && MSYMBOL_TYPE (msymbol.minsym) != mst_text_gnu_ifunc |
| 641 | && MSYMBOL_TYPE (msymbol.minsym) != mst_file_text) |
| 642 | msymbol.minsym = NULL; |
| 643 | |
| 644 | if (msymbol.minsym != NULL) |
| 645 | { |
| 646 | /* Use the minsym if no symbol is found. |
| 647 | |
| 648 | Additionally, use the minsym instead of a (found) symbol if |
| 649 | the following conditions all hold: |
| 650 | 1) The prefer_sym_over_minsym flag is false. |
| 651 | 2) The minsym address is identical to that of the address under |
| 652 | consideration. |
| 653 | 3) The symbol address is not identical to that of the address |
| 654 | under consideration. */ |
| 655 | if (symbol == NULL || |
| 656 | (!prefer_sym_over_minsym |
| 657 | && BMSYMBOL_VALUE_ADDRESS (msymbol) == addr |
| 658 | && name_location != addr)) |
| 659 | { |
| 660 | /* If this is a function (i.e. a code address), strip out any |
| 661 | non-address bits. For instance, display a pointer to the |
| 662 | first instruction of a Thumb function as <function>; the |
| 663 | second instruction will be <function+2>, even though the |
| 664 | pointer is <function+3>. This matches the ISA behavior. */ |
| 665 | if (MSYMBOL_TYPE (msymbol.minsym) == mst_text |
| 666 | || MSYMBOL_TYPE (msymbol.minsym) == mst_text_gnu_ifunc |
| 667 | || MSYMBOL_TYPE (msymbol.minsym) == mst_file_text |
| 668 | || MSYMBOL_TYPE (msymbol.minsym) == mst_solib_trampoline) |
| 669 | addr = gdbarch_addr_bits_remove (gdbarch, addr); |
| 670 | |
| 671 | symbol = 0; |
| 672 | name_location = BMSYMBOL_VALUE_ADDRESS (msymbol); |
| 673 | if (do_demangle || asm_demangle) |
| 674 | name_temp = msymbol.minsym->print_name (); |
| 675 | else |
| 676 | name_temp = msymbol.minsym->linkage_name (); |
| 677 | } |
| 678 | } |
| 679 | if (symbol == NULL && msymbol.minsym == NULL) |
| 680 | return 1; |
| 681 | |
| 682 | /* If the nearest symbol is too far away, don't print anything symbolic. */ |
| 683 | |
| 684 | /* For when CORE_ADDR is larger than unsigned int, we do math in |
| 685 | CORE_ADDR. But when we detect unsigned wraparound in the |
| 686 | CORE_ADDR math, we ignore this test and print the offset, |
| 687 | because addr+max_symbolic_offset has wrapped through the end |
| 688 | of the address space back to the beginning, giving bogus comparison. */ |
| 689 | if (addr > name_location + max_symbolic_offset |
| 690 | && name_location + max_symbolic_offset > name_location) |
| 691 | return 1; |
| 692 | |
| 693 | *offset = (LONGEST) addr - name_location; |
| 694 | |
| 695 | *name = name_temp; |
| 696 | |
| 697 | if (print_symbol_filename) |
| 698 | { |
| 699 | struct symtab_and_line sal; |
| 700 | |
| 701 | sal = find_pc_sect_line (addr, section, 0); |
| 702 | |
| 703 | if (sal.symtab) |
| 704 | { |
| 705 | *filename = symtab_to_filename_for_display (sal.symtab); |
| 706 | *line = sal.line; |
| 707 | } |
| 708 | } |
| 709 | return 0; |
| 710 | } |
| 711 | |
| 712 | |
| 713 | /* Print address ADDR symbolically on STREAM. |
| 714 | First print it as a number. Then perhaps print |
| 715 | <SYMBOL + OFFSET> after the number. */ |
| 716 | |
| 717 | void |
| 718 | print_address (struct gdbarch *gdbarch, |
| 719 | CORE_ADDR addr, struct ui_file *stream) |
| 720 | { |
| 721 | fputs_styled (paddress (gdbarch, addr), address_style.style (), stream); |
| 722 | print_address_symbolic (gdbarch, addr, stream, asm_demangle, " "); |
| 723 | } |
| 724 | |
| 725 | /* Return a prefix for instruction address: |
| 726 | "=> " for current instruction, else " ". */ |
| 727 | |
| 728 | const char * |
| 729 | pc_prefix (CORE_ADDR addr) |
| 730 | { |
| 731 | if (has_stack_frames ()) |
| 732 | { |
| 733 | struct frame_info *frame; |
| 734 | CORE_ADDR pc; |
| 735 | |
| 736 | frame = get_selected_frame (NULL); |
| 737 | if (get_frame_pc_if_available (frame, &pc) && pc == addr) |
| 738 | return "=> "; |
| 739 | } |
| 740 | return " "; |
| 741 | } |
| 742 | |
| 743 | /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE |
| 744 | controls whether to print the symbolic name "raw" or demangled. |
| 745 | Return non-zero if anything was printed; zero otherwise. */ |
| 746 | |
| 747 | int |
| 748 | print_address_demangle (const struct value_print_options *opts, |
| 749 | struct gdbarch *gdbarch, CORE_ADDR addr, |
| 750 | struct ui_file *stream, int do_demangle) |
| 751 | { |
| 752 | if (opts->addressprint) |
| 753 | { |
| 754 | fputs_styled (paddress (gdbarch, addr), address_style.style (), stream); |
| 755 | print_address_symbolic (gdbarch, addr, stream, do_demangle, " "); |
| 756 | } |
| 757 | else |
| 758 | { |
| 759 | return print_address_symbolic (gdbarch, addr, stream, do_demangle, ""); |
| 760 | } |
| 761 | return 1; |
| 762 | } |
| 763 | \f |
| 764 | |
| 765 | /* Find the address of the instruction that is INST_COUNT instructions before |
| 766 | the instruction at ADDR. |
| 767 | Since some architectures have variable-length instructions, we can't just |
| 768 | simply subtract INST_COUNT * INSN_LEN from ADDR. Instead, we use line |
| 769 | number information to locate the nearest known instruction boundary, |
| 770 | and disassemble forward from there. If we go out of the symbol range |
| 771 | during disassembling, we return the lowest address we've got so far and |
| 772 | set the number of instructions read to INST_READ. */ |
| 773 | |
| 774 | static CORE_ADDR |
| 775 | find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr, |
| 776 | int inst_count, int *inst_read) |
| 777 | { |
| 778 | /* The vector PCS is used to store instruction addresses within |
| 779 | a pc range. */ |
| 780 | CORE_ADDR loop_start, loop_end, p; |
| 781 | std::vector<CORE_ADDR> pcs; |
| 782 | struct symtab_and_line sal; |
| 783 | |
| 784 | *inst_read = 0; |
| 785 | loop_start = loop_end = addr; |
| 786 | |
| 787 | /* In each iteration of the outer loop, we get a pc range that ends before |
| 788 | LOOP_START, then we count and store every instruction address of the range |
| 789 | iterated in the loop. |
| 790 | If the number of instructions counted reaches INST_COUNT, return the |
| 791 | stored address that is located INST_COUNT instructions back from ADDR. |
| 792 | If INST_COUNT is not reached, we subtract the number of counted |
| 793 | instructions from INST_COUNT, and go to the next iteration. */ |
| 794 | do |
| 795 | { |
| 796 | pcs.clear (); |
| 797 | sal = find_pc_sect_line (loop_start, NULL, 1); |
| 798 | if (sal.line <= 0) |
| 799 | { |
| 800 | /* We reach here when line info is not available. In this case, |
| 801 | we print a message and just exit the loop. The return value |
| 802 | is calculated after the loop. */ |
| 803 | printf_filtered (_("No line number information available " |
| 804 | "for address ")); |
| 805 | wrap_here (" "); |
| 806 | print_address (gdbarch, loop_start - 1, gdb_stdout); |
| 807 | printf_filtered ("\n"); |
| 808 | break; |
| 809 | } |
| 810 | |
| 811 | loop_end = loop_start; |
| 812 | loop_start = sal.pc; |
| 813 | |
| 814 | /* This loop pushes instruction addresses in the range from |
| 815 | LOOP_START to LOOP_END. */ |
| 816 | for (p = loop_start; p < loop_end;) |
| 817 | { |
| 818 | pcs.push_back (p); |
| 819 | p += gdb_insn_length (gdbarch, p); |
| 820 | } |
| 821 | |
| 822 | inst_count -= pcs.size (); |
| 823 | *inst_read += pcs.size (); |
| 824 | } |
| 825 | while (inst_count > 0); |
| 826 | |
| 827 | /* After the loop, the vector PCS has instruction addresses of the last |
| 828 | source line we processed, and INST_COUNT has a negative value. |
| 829 | We return the address at the index of -INST_COUNT in the vector for |
| 830 | the reason below. |
| 831 | Let's assume the following instruction addresses and run 'x/-4i 0x400e'. |
| 832 | Line X of File |
| 833 | 0x4000 |
| 834 | 0x4001 |
| 835 | 0x4005 |
| 836 | Line Y of File |
| 837 | 0x4009 |
| 838 | 0x400c |
| 839 | => 0x400e |
| 840 | 0x4011 |
| 841 | find_instruction_backward is called with INST_COUNT = 4 and expected to |
| 842 | return 0x4001. When we reach here, INST_COUNT is set to -1 because |
| 843 | it was subtracted by 2 (from Line Y) and 3 (from Line X). The value |
| 844 | 4001 is located at the index 1 of the last iterated line (= Line X), |
| 845 | which is simply calculated by -INST_COUNT. |
| 846 | The case when the length of PCS is 0 means that we reached an area for |
| 847 | which line info is not available. In such case, we return LOOP_START, |
| 848 | which was the lowest instruction address that had line info. */ |
| 849 | p = pcs.size () > 0 ? pcs[-inst_count] : loop_start; |
| 850 | |
| 851 | /* INST_READ includes all instruction addresses in a pc range. Need to |
| 852 | exclude the beginning part up to the address we're returning. That |
| 853 | is, exclude {0x4000} in the example above. */ |
| 854 | if (inst_count < 0) |
| 855 | *inst_read += inst_count; |
| 856 | |
| 857 | return p; |
| 858 | } |
| 859 | |
| 860 | /* Backward read LEN bytes of target memory from address MEMADDR + LEN, |
| 861 | placing the results in GDB's memory from MYADDR + LEN. Returns |
| 862 | a count of the bytes actually read. */ |
| 863 | |
| 864 | static int |
| 865 | read_memory_backward (struct gdbarch *gdbarch, |
| 866 | CORE_ADDR memaddr, gdb_byte *myaddr, int len) |
| 867 | { |
| 868 | int errcode; |
| 869 | int nread; /* Number of bytes actually read. */ |
| 870 | |
| 871 | /* First try a complete read. */ |
| 872 | errcode = target_read_memory (memaddr, myaddr, len); |
| 873 | if (errcode == 0) |
| 874 | { |
| 875 | /* Got it all. */ |
| 876 | nread = len; |
| 877 | } |
| 878 | else |
| 879 | { |
| 880 | /* Loop, reading one byte at a time until we get as much as we can. */ |
| 881 | memaddr += len; |
| 882 | myaddr += len; |
| 883 | for (nread = 0; nread < len; ++nread) |
| 884 | { |
| 885 | errcode = target_read_memory (--memaddr, --myaddr, 1); |
| 886 | if (errcode != 0) |
| 887 | { |
| 888 | /* The read was unsuccessful, so exit the loop. */ |
| 889 | printf_filtered (_("Cannot access memory at address %s\n"), |
| 890 | paddress (gdbarch, memaddr)); |
| 891 | break; |
| 892 | } |
| 893 | } |
| 894 | } |
| 895 | return nread; |
| 896 | } |
| 897 | |
| 898 | /* Returns true if X (which is LEN bytes wide) is the number zero. */ |
| 899 | |
| 900 | static int |
| 901 | integer_is_zero (const gdb_byte *x, int len) |
| 902 | { |
| 903 | int i = 0; |
| 904 | |
| 905 | while (i < len && x[i] == 0) |
| 906 | ++i; |
| 907 | return (i == len); |
| 908 | } |
| 909 | |
| 910 | /* Find the start address of a string in which ADDR is included. |
| 911 | Basically we search for '\0' and return the next address, |
| 912 | but if OPTIONS->PRINT_MAX is smaller than the length of a string, |
| 913 | we stop searching and return the address to print characters as many as |
| 914 | PRINT_MAX from the string. */ |
| 915 | |
| 916 | static CORE_ADDR |
| 917 | find_string_backward (struct gdbarch *gdbarch, |
| 918 | CORE_ADDR addr, int count, int char_size, |
| 919 | const struct value_print_options *options, |
| 920 | int *strings_counted) |
| 921 | { |
| 922 | const int chunk_size = 0x20; |
| 923 | int read_error = 0; |
| 924 | int chars_read = 0; |
| 925 | int chars_to_read = chunk_size; |
| 926 | int chars_counted = 0; |
| 927 | int count_original = count; |
| 928 | CORE_ADDR string_start_addr = addr; |
| 929 | |
| 930 | gdb_assert (char_size == 1 || char_size == 2 || char_size == 4); |
| 931 | gdb::byte_vector buffer (chars_to_read * char_size); |
| 932 | while (count > 0 && read_error == 0) |
| 933 | { |
| 934 | int i; |
| 935 | |
| 936 | addr -= chars_to_read * char_size; |
| 937 | chars_read = read_memory_backward (gdbarch, addr, buffer.data (), |
| 938 | chars_to_read * char_size); |
| 939 | chars_read /= char_size; |
| 940 | read_error = (chars_read == chars_to_read) ? 0 : 1; |
| 941 | /* Searching for '\0' from the end of buffer in backward direction. */ |
| 942 | for (i = 0; i < chars_read && count > 0 ; ++i, ++chars_counted) |
| 943 | { |
| 944 | int offset = (chars_to_read - i - 1) * char_size; |
| 945 | |
| 946 | if (integer_is_zero (&buffer[offset], char_size) |
| 947 | || chars_counted == options->print_max) |
| 948 | { |
| 949 | /* Found '\0' or reached print_max. As OFFSET is the offset to |
| 950 | '\0', we add CHAR_SIZE to return the start address of |
| 951 | a string. */ |
| 952 | --count; |
| 953 | string_start_addr = addr + offset + char_size; |
| 954 | chars_counted = 0; |
| 955 | } |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | /* Update STRINGS_COUNTED with the actual number of loaded strings. */ |
| 960 | *strings_counted = count_original - count; |
| 961 | |
| 962 | if (read_error != 0) |
| 963 | { |
| 964 | /* In error case, STRING_START_ADDR is pointing to the string that |
| 965 | was last successfully loaded. Rewind the partially loaded string. */ |
| 966 | string_start_addr -= chars_counted * char_size; |
| 967 | } |
| 968 | |
| 969 | return string_start_addr; |
| 970 | } |
| 971 | |
| 972 | /* Examine data at address ADDR in format FMT. |
| 973 | Fetch it from memory and print on gdb_stdout. */ |
| 974 | |
| 975 | static void |
| 976 | do_examine (struct format_data fmt, struct gdbarch *gdbarch, CORE_ADDR addr) |
| 977 | { |
| 978 | char format = 0; |
| 979 | char size; |
| 980 | int count = 1; |
| 981 | struct type *val_type = NULL; |
| 982 | int i; |
| 983 | int maxelts; |
| 984 | struct value_print_options opts; |
| 985 | int need_to_update_next_address = 0; |
| 986 | CORE_ADDR addr_rewound = 0; |
| 987 | |
| 988 | format = fmt.format; |
| 989 | size = fmt.size; |
| 990 | count = fmt.count; |
| 991 | next_gdbarch = gdbarch; |
| 992 | next_address = addr; |
| 993 | |
| 994 | /* Instruction format implies fetch single bytes |
| 995 | regardless of the specified size. |
| 996 | The case of strings is handled in decode_format, only explicit |
| 997 | size operator are not changed to 'b'. */ |
| 998 | if (format == 'i') |
| 999 | size = 'b'; |
| 1000 | |
| 1001 | if (size == 'a') |
| 1002 | { |
| 1003 | /* Pick the appropriate size for an address. */ |
| 1004 | if (gdbarch_ptr_bit (next_gdbarch) == 64) |
| 1005 | size = 'g'; |
| 1006 | else if (gdbarch_ptr_bit (next_gdbarch) == 32) |
| 1007 | size = 'w'; |
| 1008 | else if (gdbarch_ptr_bit (next_gdbarch) == 16) |
| 1009 | size = 'h'; |
| 1010 | else |
| 1011 | /* Bad value for gdbarch_ptr_bit. */ |
| 1012 | internal_error (__FILE__, __LINE__, |
| 1013 | _("failed internal consistency check")); |
| 1014 | } |
| 1015 | |
| 1016 | if (size == 'b') |
| 1017 | val_type = builtin_type (next_gdbarch)->builtin_int8; |
| 1018 | else if (size == 'h') |
| 1019 | val_type = builtin_type (next_gdbarch)->builtin_int16; |
| 1020 | else if (size == 'w') |
| 1021 | val_type = builtin_type (next_gdbarch)->builtin_int32; |
| 1022 | else if (size == 'g') |
| 1023 | val_type = builtin_type (next_gdbarch)->builtin_int64; |
| 1024 | |
| 1025 | if (format == 's') |
| 1026 | { |
| 1027 | struct type *char_type = NULL; |
| 1028 | |
| 1029 | /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char |
| 1030 | if type is not found. */ |
| 1031 | if (size == 'h') |
| 1032 | char_type = builtin_type (next_gdbarch)->builtin_char16; |
| 1033 | else if (size == 'w') |
| 1034 | char_type = builtin_type (next_gdbarch)->builtin_char32; |
| 1035 | if (char_type) |
| 1036 | val_type = char_type; |
| 1037 | else |
| 1038 | { |
| 1039 | if (size != '\0' && size != 'b') |
| 1040 | warning (_("Unable to display strings with " |
| 1041 | "size '%c', using 'b' instead."), size); |
| 1042 | size = 'b'; |
| 1043 | val_type = builtin_type (next_gdbarch)->builtin_int8; |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | maxelts = 8; |
| 1048 | if (size == 'w') |
| 1049 | maxelts = 4; |
| 1050 | if (size == 'g') |
| 1051 | maxelts = 2; |
| 1052 | if (format == 's' || format == 'i') |
| 1053 | maxelts = 1; |
| 1054 | |
| 1055 | get_formatted_print_options (&opts, format); |
| 1056 | |
| 1057 | if (count < 0) |
| 1058 | { |
| 1059 | /* This is the negative repeat count case. |
| 1060 | We rewind the address based on the given repeat count and format, |
| 1061 | then examine memory from there in forward direction. */ |
| 1062 | |
| 1063 | count = -count; |
| 1064 | if (format == 'i') |
| 1065 | { |
| 1066 | next_address = find_instruction_backward (gdbarch, addr, count, |
| 1067 | &count); |
| 1068 | } |
| 1069 | else if (format == 's') |
| 1070 | { |
| 1071 | next_address = find_string_backward (gdbarch, addr, count, |
| 1072 | TYPE_LENGTH (val_type), |
| 1073 | &opts, &count); |
| 1074 | } |
| 1075 | else |
| 1076 | { |
| 1077 | next_address = addr - count * TYPE_LENGTH (val_type); |
| 1078 | } |
| 1079 | |
| 1080 | /* The following call to print_formatted updates next_address in every |
| 1081 | iteration. In backward case, we store the start address here |
| 1082 | and update next_address with it before exiting the function. */ |
| 1083 | addr_rewound = (format == 's' |
| 1084 | ? next_address - TYPE_LENGTH (val_type) |
| 1085 | : next_address); |
| 1086 | need_to_update_next_address = 1; |
| 1087 | } |
| 1088 | |
| 1089 | /* Print as many objects as specified in COUNT, at most maxelts per line, |
| 1090 | with the address of the next one at the start of each line. */ |
| 1091 | |
| 1092 | while (count > 0) |
| 1093 | { |
| 1094 | QUIT; |
| 1095 | if (format == 'i') |
| 1096 | fputs_filtered (pc_prefix (next_address), gdb_stdout); |
| 1097 | print_address (next_gdbarch, next_address, gdb_stdout); |
| 1098 | printf_filtered (":"); |
| 1099 | for (i = maxelts; |
| 1100 | i > 0 && count > 0; |
| 1101 | i--, count--) |
| 1102 | { |
| 1103 | printf_filtered ("\t"); |
| 1104 | /* Note that print_formatted sets next_address for the next |
| 1105 | object. */ |
| 1106 | last_examine_address = next_address; |
| 1107 | |
| 1108 | /* The value to be displayed is not fetched greedily. |
| 1109 | Instead, to avoid the possibility of a fetched value not |
| 1110 | being used, its retrieval is delayed until the print code |
| 1111 | uses it. When examining an instruction stream, the |
| 1112 | disassembler will perform its own memory fetch using just |
| 1113 | the address stored in LAST_EXAMINE_VALUE. FIXME: Should |
| 1114 | the disassembler be modified so that LAST_EXAMINE_VALUE |
| 1115 | is left with the byte sequence from the last complete |
| 1116 | instruction fetched from memory? */ |
| 1117 | last_examine_value |
| 1118 | = release_value (value_at_lazy (val_type, next_address)); |
| 1119 | |
| 1120 | print_formatted (last_examine_value.get (), size, &opts, gdb_stdout); |
| 1121 | |
| 1122 | /* Display any branch delay slots following the final insn. */ |
| 1123 | if (format == 'i' && count == 1) |
| 1124 | count += branch_delay_insns; |
| 1125 | } |
| 1126 | printf_filtered ("\n"); |
| 1127 | } |
| 1128 | |
| 1129 | if (need_to_update_next_address) |
| 1130 | next_address = addr_rewound; |
| 1131 | } |
| 1132 | \f |
| 1133 | static void |
| 1134 | validate_format (struct format_data fmt, const char *cmdname) |
| 1135 | { |
| 1136 | if (fmt.size != 0) |
| 1137 | error (_("Size letters are meaningless in \"%s\" command."), cmdname); |
| 1138 | if (fmt.count != 1) |
| 1139 | error (_("Item count other than 1 is meaningless in \"%s\" command."), |
| 1140 | cmdname); |
| 1141 | if (fmt.format == 'i') |
| 1142 | error (_("Format letter \"%c\" is meaningless in \"%s\" command."), |
| 1143 | fmt.format, cmdname); |
| 1144 | } |
| 1145 | |
| 1146 | /* Parse print command format string into *OPTS and update *EXPP. |
| 1147 | CMDNAME should name the current command. */ |
| 1148 | |
| 1149 | void |
| 1150 | print_command_parse_format (const char **expp, const char *cmdname, |
| 1151 | value_print_options *opts) |
| 1152 | { |
| 1153 | const char *exp = *expp; |
| 1154 | |
| 1155 | /* opts->raw value might already have been set by 'set print raw-values' |
| 1156 | or by using 'print -raw-values'. |
| 1157 | So, do not set opts->raw to 0, only set it to 1 if /r is given. */ |
| 1158 | if (exp && *exp == '/') |
| 1159 | { |
| 1160 | format_data fmt; |
| 1161 | |
| 1162 | exp++; |
| 1163 | fmt = decode_format (&exp, last_format, 0); |
| 1164 | validate_format (fmt, cmdname); |
| 1165 | last_format = fmt.format; |
| 1166 | |
| 1167 | opts->format = fmt.format; |
| 1168 | opts->raw = opts->raw || fmt.raw; |
| 1169 | } |
| 1170 | else |
| 1171 | { |
| 1172 | opts->format = 0; |
| 1173 | } |
| 1174 | |
| 1175 | *expp = exp; |
| 1176 | } |
| 1177 | |
| 1178 | /* See valprint.h. */ |
| 1179 | |
| 1180 | void |
| 1181 | print_value (value *val, const value_print_options &opts) |
| 1182 | { |
| 1183 | int histindex = record_latest_value (val); |
| 1184 | |
| 1185 | annotate_value_history_begin (histindex, value_type (val)); |
| 1186 | |
| 1187 | printf_filtered ("$%d = ", histindex); |
| 1188 | |
| 1189 | annotate_value_history_value (); |
| 1190 | |
| 1191 | print_formatted (val, 0, &opts, gdb_stdout); |
| 1192 | printf_filtered ("\n"); |
| 1193 | |
| 1194 | annotate_value_history_end (); |
| 1195 | } |
| 1196 | |
| 1197 | /* Implementation of the "print" and "call" commands. */ |
| 1198 | |
| 1199 | static void |
| 1200 | print_command_1 (const char *args, int voidprint) |
| 1201 | { |
| 1202 | struct value *val; |
| 1203 | value_print_options print_opts; |
| 1204 | |
| 1205 | get_user_print_options (&print_opts); |
| 1206 | /* Override global settings with explicit options, if any. */ |
| 1207 | auto group = make_value_print_options_def_group (&print_opts); |
| 1208 | gdb::option::process_options |
| 1209 | (&args, gdb::option::PROCESS_OPTIONS_REQUIRE_DELIMITER, group); |
| 1210 | |
| 1211 | print_command_parse_format (&args, "print", &print_opts); |
| 1212 | |
| 1213 | const char *exp = args; |
| 1214 | |
| 1215 | if (exp != nullptr && *exp) |
| 1216 | { |
| 1217 | expression_up expr = parse_expression (exp); |
| 1218 | val = evaluate_expression (expr.get ()); |
| 1219 | } |
| 1220 | else |
| 1221 | val = access_value_history (0); |
| 1222 | |
| 1223 | if (voidprint || (val && value_type (val) && |
| 1224 | TYPE_CODE (value_type (val)) != TYPE_CODE_VOID)) |
| 1225 | print_value (val, print_opts); |
| 1226 | } |
| 1227 | |
| 1228 | /* See valprint.h. */ |
| 1229 | |
| 1230 | void |
| 1231 | print_command_completer (struct cmd_list_element *ignore, |
| 1232 | completion_tracker &tracker, |
| 1233 | const char *text, const char * /*word*/) |
| 1234 | { |
| 1235 | const auto group = make_value_print_options_def_group (nullptr); |
| 1236 | if (gdb::option::complete_options |
| 1237 | (tracker, &text, gdb::option::PROCESS_OPTIONS_REQUIRE_DELIMITER, group)) |
| 1238 | return; |
| 1239 | |
| 1240 | const char *word = advance_to_expression_complete_word_point (tracker, text); |
| 1241 | expression_completer (ignore, tracker, text, word); |
| 1242 | } |
| 1243 | |
| 1244 | static void |
| 1245 | print_command (const char *exp, int from_tty) |
| 1246 | { |
| 1247 | print_command_1 (exp, 1); |
| 1248 | } |
| 1249 | |
| 1250 | /* Same as print, except it doesn't print void results. */ |
| 1251 | static void |
| 1252 | call_command (const char *exp, int from_tty) |
| 1253 | { |
| 1254 | print_command_1 (exp, 0); |
| 1255 | } |
| 1256 | |
| 1257 | /* Implementation of the "output" command. */ |
| 1258 | |
| 1259 | void |
| 1260 | output_command (const char *exp, int from_tty) |
| 1261 | { |
| 1262 | char format = 0; |
| 1263 | struct value *val; |
| 1264 | struct format_data fmt; |
| 1265 | struct value_print_options opts; |
| 1266 | |
| 1267 | fmt.size = 0; |
| 1268 | fmt.raw = 0; |
| 1269 | |
| 1270 | if (exp && *exp == '/') |
| 1271 | { |
| 1272 | exp++; |
| 1273 | fmt = decode_format (&exp, 0, 0); |
| 1274 | validate_format (fmt, "output"); |
| 1275 | format = fmt.format; |
| 1276 | } |
| 1277 | |
| 1278 | expression_up expr = parse_expression (exp); |
| 1279 | |
| 1280 | val = evaluate_expression (expr.get ()); |
| 1281 | |
| 1282 | annotate_value_begin (value_type (val)); |
| 1283 | |
| 1284 | get_formatted_print_options (&opts, format); |
| 1285 | opts.raw = fmt.raw; |
| 1286 | print_formatted (val, fmt.size, &opts, gdb_stdout); |
| 1287 | |
| 1288 | annotate_value_end (); |
| 1289 | |
| 1290 | wrap_here (""); |
| 1291 | gdb_flush (gdb_stdout); |
| 1292 | } |
| 1293 | |
| 1294 | static void |
| 1295 | set_command (const char *exp, int from_tty) |
| 1296 | { |
| 1297 | expression_up expr = parse_expression (exp); |
| 1298 | |
| 1299 | if (expr->nelts >= 1) |
| 1300 | switch (expr->elts[0].opcode) |
| 1301 | { |
| 1302 | case UNOP_PREINCREMENT: |
| 1303 | case UNOP_POSTINCREMENT: |
| 1304 | case UNOP_PREDECREMENT: |
| 1305 | case UNOP_POSTDECREMENT: |
| 1306 | case BINOP_ASSIGN: |
| 1307 | case BINOP_ASSIGN_MODIFY: |
| 1308 | case BINOP_COMMA: |
| 1309 | break; |
| 1310 | default: |
| 1311 | warning |
| 1312 | (_("Expression is not an assignment (and might have no effect)")); |
| 1313 | } |
| 1314 | |
| 1315 | evaluate_expression (expr.get ()); |
| 1316 | } |
| 1317 | |
| 1318 | static void |
| 1319 | info_symbol_command (const char *arg, int from_tty) |
| 1320 | { |
| 1321 | struct minimal_symbol *msymbol; |
| 1322 | struct obj_section *osect; |
| 1323 | CORE_ADDR addr, sect_addr; |
| 1324 | int matches = 0; |
| 1325 | unsigned int offset; |
| 1326 | |
| 1327 | if (!arg) |
| 1328 | error_no_arg (_("address")); |
| 1329 | |
| 1330 | addr = parse_and_eval_address (arg); |
| 1331 | for (objfile *objfile : current_program_space->objfiles ()) |
| 1332 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 1333 | { |
| 1334 | /* Only process each object file once, even if there's a separate |
| 1335 | debug file. */ |
| 1336 | if (objfile->separate_debug_objfile_backlink) |
| 1337 | continue; |
| 1338 | |
| 1339 | sect_addr = overlay_mapped_address (addr, osect); |
| 1340 | |
| 1341 | if (obj_section_addr (osect) <= sect_addr |
| 1342 | && sect_addr < obj_section_endaddr (osect) |
| 1343 | && (msymbol |
| 1344 | = lookup_minimal_symbol_by_pc_section (sect_addr, |
| 1345 | osect).minsym)) |
| 1346 | { |
| 1347 | const char *obj_name, *mapped, *sec_name, *msym_name; |
| 1348 | const char *loc_string; |
| 1349 | |
| 1350 | matches = 1; |
| 1351 | offset = sect_addr - MSYMBOL_VALUE_ADDRESS (objfile, msymbol); |
| 1352 | mapped = section_is_mapped (osect) ? _("mapped") : _("unmapped"); |
| 1353 | sec_name = osect->the_bfd_section->name; |
| 1354 | msym_name = msymbol->print_name (); |
| 1355 | |
| 1356 | /* Don't print the offset if it is zero. |
| 1357 | We assume there's no need to handle i18n of "sym + offset". */ |
| 1358 | std::string string_holder; |
| 1359 | if (offset) |
| 1360 | { |
| 1361 | string_holder = string_printf ("%s + %u", msym_name, offset); |
| 1362 | loc_string = string_holder.c_str (); |
| 1363 | } |
| 1364 | else |
| 1365 | loc_string = msym_name; |
| 1366 | |
| 1367 | gdb_assert (osect->objfile && objfile_name (osect->objfile)); |
| 1368 | obj_name = objfile_name (osect->objfile); |
| 1369 | |
| 1370 | if (current_program_space->multi_objfile_p ()) |
| 1371 | if (pc_in_unmapped_range (addr, osect)) |
| 1372 | if (section_is_overlay (osect)) |
| 1373 | printf_filtered (_("%s in load address range of " |
| 1374 | "%s overlay section %s of %s\n"), |
| 1375 | loc_string, mapped, sec_name, obj_name); |
| 1376 | else |
| 1377 | printf_filtered (_("%s in load address range of " |
| 1378 | "section %s of %s\n"), |
| 1379 | loc_string, sec_name, obj_name); |
| 1380 | else |
| 1381 | if (section_is_overlay (osect)) |
| 1382 | printf_filtered (_("%s in %s overlay section %s of %s\n"), |
| 1383 | loc_string, mapped, sec_name, obj_name); |
| 1384 | else |
| 1385 | printf_filtered (_("%s in section %s of %s\n"), |
| 1386 | loc_string, sec_name, obj_name); |
| 1387 | else |
| 1388 | if (pc_in_unmapped_range (addr, osect)) |
| 1389 | if (section_is_overlay (osect)) |
| 1390 | printf_filtered (_("%s in load address range of %s overlay " |
| 1391 | "section %s\n"), |
| 1392 | loc_string, mapped, sec_name); |
| 1393 | else |
| 1394 | printf_filtered |
| 1395 | (_("%s in load address range of section %s\n"), |
| 1396 | loc_string, sec_name); |
| 1397 | else |
| 1398 | if (section_is_overlay (osect)) |
| 1399 | printf_filtered (_("%s in %s overlay section %s\n"), |
| 1400 | loc_string, mapped, sec_name); |
| 1401 | else |
| 1402 | printf_filtered (_("%s in section %s\n"), |
| 1403 | loc_string, sec_name); |
| 1404 | } |
| 1405 | } |
| 1406 | if (matches == 0) |
| 1407 | printf_filtered (_("No symbol matches %s.\n"), arg); |
| 1408 | } |
| 1409 | |
| 1410 | static void |
| 1411 | info_address_command (const char *exp, int from_tty) |
| 1412 | { |
| 1413 | struct gdbarch *gdbarch; |
| 1414 | int regno; |
| 1415 | struct symbol *sym; |
| 1416 | struct bound_minimal_symbol msymbol; |
| 1417 | long val; |
| 1418 | struct obj_section *section; |
| 1419 | CORE_ADDR load_addr, context_pc = 0; |
| 1420 | struct field_of_this_result is_a_field_of_this; |
| 1421 | |
| 1422 | if (exp == 0) |
| 1423 | error (_("Argument required.")); |
| 1424 | |
| 1425 | sym = lookup_symbol (exp, get_selected_block (&context_pc), VAR_DOMAIN, |
| 1426 | &is_a_field_of_this).symbol; |
| 1427 | if (sym == NULL) |
| 1428 | { |
| 1429 | if (is_a_field_of_this.type != NULL) |
| 1430 | { |
| 1431 | printf_filtered ("Symbol \""); |
| 1432 | fprintf_symbol_filtered (gdb_stdout, exp, |
| 1433 | current_language->la_language, DMGL_ANSI); |
| 1434 | printf_filtered ("\" is a field of the local class variable "); |
| 1435 | if (current_language->la_language == language_objc) |
| 1436 | printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */ |
| 1437 | else |
| 1438 | printf_filtered ("`this'\n"); |
| 1439 | return; |
| 1440 | } |
| 1441 | |
| 1442 | msymbol = lookup_bound_minimal_symbol (exp); |
| 1443 | |
| 1444 | if (msymbol.minsym != NULL) |
| 1445 | { |
| 1446 | struct objfile *objfile = msymbol.objfile; |
| 1447 | |
| 1448 | gdbarch = get_objfile_arch (objfile); |
| 1449 | load_addr = BMSYMBOL_VALUE_ADDRESS (msymbol); |
| 1450 | |
| 1451 | printf_filtered ("Symbol \""); |
| 1452 | fprintf_symbol_filtered (gdb_stdout, exp, |
| 1453 | current_language->la_language, DMGL_ANSI); |
| 1454 | printf_filtered ("\" is at "); |
| 1455 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1456 | gdb_stdout); |
| 1457 | printf_filtered (" in a file compiled without debugging"); |
| 1458 | section = MSYMBOL_OBJ_SECTION (objfile, msymbol.minsym); |
| 1459 | if (section_is_overlay (section)) |
| 1460 | { |
| 1461 | load_addr = overlay_unmapped_address (load_addr, section); |
| 1462 | printf_filtered (",\n -- loaded at "); |
| 1463 | fputs_styled (paddress (gdbarch, load_addr), |
| 1464 | address_style.style (), |
| 1465 | gdb_stdout); |
| 1466 | printf_filtered (" in overlay section %s", |
| 1467 | section->the_bfd_section->name); |
| 1468 | } |
| 1469 | printf_filtered (".\n"); |
| 1470 | } |
| 1471 | else |
| 1472 | error (_("No symbol \"%s\" in current context."), exp); |
| 1473 | return; |
| 1474 | } |
| 1475 | |
| 1476 | printf_filtered ("Symbol \""); |
| 1477 | fprintf_symbol_filtered (gdb_stdout, sym->print_name (), |
| 1478 | current_language->la_language, DMGL_ANSI); |
| 1479 | printf_filtered ("\" is "); |
| 1480 | val = SYMBOL_VALUE (sym); |
| 1481 | if (SYMBOL_OBJFILE_OWNED (sym)) |
| 1482 | section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym); |
| 1483 | else |
| 1484 | section = NULL; |
| 1485 | gdbarch = symbol_arch (sym); |
| 1486 | |
| 1487 | if (SYMBOL_COMPUTED_OPS (sym) != NULL) |
| 1488 | { |
| 1489 | SYMBOL_COMPUTED_OPS (sym)->describe_location (sym, context_pc, |
| 1490 | gdb_stdout); |
| 1491 | printf_filtered (".\n"); |
| 1492 | return; |
| 1493 | } |
| 1494 | |
| 1495 | switch (SYMBOL_CLASS (sym)) |
| 1496 | { |
| 1497 | case LOC_CONST: |
| 1498 | case LOC_CONST_BYTES: |
| 1499 | printf_filtered ("constant"); |
| 1500 | break; |
| 1501 | |
| 1502 | case LOC_LABEL: |
| 1503 | printf_filtered ("a label at address "); |
| 1504 | load_addr = SYMBOL_VALUE_ADDRESS (sym); |
| 1505 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1506 | gdb_stdout); |
| 1507 | if (section_is_overlay (section)) |
| 1508 | { |
| 1509 | load_addr = overlay_unmapped_address (load_addr, section); |
| 1510 | printf_filtered (",\n -- loaded at "); |
| 1511 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1512 | gdb_stdout); |
| 1513 | printf_filtered (" in overlay section %s", |
| 1514 | section->the_bfd_section->name); |
| 1515 | } |
| 1516 | break; |
| 1517 | |
| 1518 | case LOC_COMPUTED: |
| 1519 | gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method")); |
| 1520 | |
| 1521 | case LOC_REGISTER: |
| 1522 | /* GDBARCH is the architecture associated with the objfile the symbol |
| 1523 | is defined in; the target architecture may be different, and may |
| 1524 | provide additional registers. However, we do not know the target |
| 1525 | architecture at this point. We assume the objfile architecture |
| 1526 | will contain all the standard registers that occur in debug info |
| 1527 | in that objfile. */ |
| 1528 | regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch); |
| 1529 | |
| 1530 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 1531 | printf_filtered (_("an argument in register %s"), |
| 1532 | gdbarch_register_name (gdbarch, regno)); |
| 1533 | else |
| 1534 | printf_filtered (_("a variable in register %s"), |
| 1535 | gdbarch_register_name (gdbarch, regno)); |
| 1536 | break; |
| 1537 | |
| 1538 | case LOC_STATIC: |
| 1539 | printf_filtered (_("static storage at address ")); |
| 1540 | load_addr = SYMBOL_VALUE_ADDRESS (sym); |
| 1541 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1542 | gdb_stdout); |
| 1543 | if (section_is_overlay (section)) |
| 1544 | { |
| 1545 | load_addr = overlay_unmapped_address (load_addr, section); |
| 1546 | printf_filtered (_(",\n -- loaded at ")); |
| 1547 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1548 | gdb_stdout); |
| 1549 | printf_filtered (_(" in overlay section %s"), |
| 1550 | section->the_bfd_section->name); |
| 1551 | } |
| 1552 | break; |
| 1553 | |
| 1554 | case LOC_REGPARM_ADDR: |
| 1555 | /* Note comment at LOC_REGISTER. */ |
| 1556 | regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch); |
| 1557 | printf_filtered (_("address of an argument in register %s"), |
| 1558 | gdbarch_register_name (gdbarch, regno)); |
| 1559 | break; |
| 1560 | |
| 1561 | case LOC_ARG: |
| 1562 | printf_filtered (_("an argument at offset %ld"), val); |
| 1563 | break; |
| 1564 | |
| 1565 | case LOC_LOCAL: |
| 1566 | printf_filtered (_("a local variable at frame offset %ld"), val); |
| 1567 | break; |
| 1568 | |
| 1569 | case LOC_REF_ARG: |
| 1570 | printf_filtered (_("a reference argument at offset %ld"), val); |
| 1571 | break; |
| 1572 | |
| 1573 | case LOC_TYPEDEF: |
| 1574 | printf_filtered (_("a typedef")); |
| 1575 | break; |
| 1576 | |
| 1577 | case LOC_BLOCK: |
| 1578 | printf_filtered (_("a function at address ")); |
| 1579 | load_addr = BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (sym)); |
| 1580 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1581 | gdb_stdout); |
| 1582 | if (section_is_overlay (section)) |
| 1583 | { |
| 1584 | load_addr = overlay_unmapped_address (load_addr, section); |
| 1585 | printf_filtered (_(",\n -- loaded at ")); |
| 1586 | fputs_styled (paddress (gdbarch, load_addr), address_style.style (), |
| 1587 | gdb_stdout); |
| 1588 | printf_filtered (_(" in overlay section %s"), |
| 1589 | section->the_bfd_section->name); |
| 1590 | } |
| 1591 | break; |
| 1592 | |
| 1593 | case LOC_UNRESOLVED: |
| 1594 | { |
| 1595 | struct bound_minimal_symbol msym; |
| 1596 | |
| 1597 | msym = lookup_bound_minimal_symbol (sym->linkage_name ()); |
| 1598 | if (msym.minsym == NULL) |
| 1599 | printf_filtered ("unresolved"); |
| 1600 | else |
| 1601 | { |
| 1602 | section = MSYMBOL_OBJ_SECTION (msym.objfile, msym.minsym); |
| 1603 | |
| 1604 | if (section |
| 1605 | && (section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0) |
| 1606 | { |
| 1607 | load_addr = MSYMBOL_VALUE_RAW_ADDRESS (msym.minsym); |
| 1608 | printf_filtered (_("a thread-local variable at offset %s " |
| 1609 | "in the thread-local storage for `%s'"), |
| 1610 | paddress (gdbarch, load_addr), |
| 1611 | objfile_name (section->objfile)); |
| 1612 | } |
| 1613 | else |
| 1614 | { |
| 1615 | load_addr = BMSYMBOL_VALUE_ADDRESS (msym); |
| 1616 | printf_filtered (_("static storage at address ")); |
| 1617 | fputs_styled (paddress (gdbarch, load_addr), |
| 1618 | address_style.style (), gdb_stdout); |
| 1619 | if (section_is_overlay (section)) |
| 1620 | { |
| 1621 | load_addr = overlay_unmapped_address (load_addr, section); |
| 1622 | printf_filtered (_(",\n -- loaded at ")); |
| 1623 | fputs_styled (paddress (gdbarch, load_addr), |
| 1624 | address_style.style (), |
| 1625 | gdb_stdout); |
| 1626 | printf_filtered (_(" in overlay section %s"), |
| 1627 | section->the_bfd_section->name); |
| 1628 | } |
| 1629 | } |
| 1630 | } |
| 1631 | } |
| 1632 | break; |
| 1633 | |
| 1634 | case LOC_OPTIMIZED_OUT: |
| 1635 | printf_filtered (_("optimized out")); |
| 1636 | break; |
| 1637 | |
| 1638 | default: |
| 1639 | printf_filtered (_("of unknown (botched) type")); |
| 1640 | break; |
| 1641 | } |
| 1642 | printf_filtered (".\n"); |
| 1643 | } |
| 1644 | \f |
| 1645 | |
| 1646 | static void |
| 1647 | x_command (const char *exp, int from_tty) |
| 1648 | { |
| 1649 | struct format_data fmt; |
| 1650 | struct value *val; |
| 1651 | |
| 1652 | fmt.format = last_format ? last_format : 'x'; |
| 1653 | fmt.size = last_size; |
| 1654 | fmt.count = 1; |
| 1655 | fmt.raw = 0; |
| 1656 | |
| 1657 | /* If there is no expression and no format, use the most recent |
| 1658 | count. */ |
| 1659 | if (exp == nullptr && last_count > 0) |
| 1660 | fmt.count = last_count; |
| 1661 | |
| 1662 | if (exp && *exp == '/') |
| 1663 | { |
| 1664 | const char *tmp = exp + 1; |
| 1665 | |
| 1666 | fmt = decode_format (&tmp, last_format, last_size); |
| 1667 | exp = (char *) tmp; |
| 1668 | } |
| 1669 | |
| 1670 | last_count = fmt.count; |
| 1671 | |
| 1672 | /* If we have an expression, evaluate it and use it as the address. */ |
| 1673 | |
| 1674 | if (exp != 0 && *exp != 0) |
| 1675 | { |
| 1676 | expression_up expr = parse_expression (exp); |
| 1677 | /* Cause expression not to be there any more if this command is |
| 1678 | repeated with Newline. But don't clobber a user-defined |
| 1679 | command's definition. */ |
| 1680 | if (from_tty) |
| 1681 | set_repeat_arguments (""); |
| 1682 | val = evaluate_expression (expr.get ()); |
| 1683 | if (TYPE_IS_REFERENCE (value_type (val))) |
| 1684 | val = coerce_ref (val); |
| 1685 | /* In rvalue contexts, such as this, functions are coerced into |
| 1686 | pointers to functions. This makes "x/i main" work. */ |
| 1687 | if (/* last_format == 'i' && */ |
| 1688 | TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC |
| 1689 | && VALUE_LVAL (val) == lval_memory) |
| 1690 | next_address = value_address (val); |
| 1691 | else |
| 1692 | next_address = value_as_address (val); |
| 1693 | |
| 1694 | next_gdbarch = expr->gdbarch; |
| 1695 | } |
| 1696 | |
| 1697 | if (!next_gdbarch) |
| 1698 | error_no_arg (_("starting display address")); |
| 1699 | |
| 1700 | do_examine (fmt, next_gdbarch, next_address); |
| 1701 | |
| 1702 | /* If the examine succeeds, we remember its size and format for next |
| 1703 | time. Set last_size to 'b' for strings. */ |
| 1704 | if (fmt.format == 's') |
| 1705 | last_size = 'b'; |
| 1706 | else |
| 1707 | last_size = fmt.size; |
| 1708 | last_format = fmt.format; |
| 1709 | |
| 1710 | /* Set a couple of internal variables if appropriate. */ |
| 1711 | if (last_examine_value != nullptr) |
| 1712 | { |
| 1713 | /* Make last address examined available to the user as $_. Use |
| 1714 | the correct pointer type. */ |
| 1715 | struct type *pointer_type |
| 1716 | = lookup_pointer_type (value_type (last_examine_value.get ())); |
| 1717 | set_internalvar (lookup_internalvar ("_"), |
| 1718 | value_from_pointer (pointer_type, |
| 1719 | last_examine_address)); |
| 1720 | |
| 1721 | /* Make contents of last address examined available to the user |
| 1722 | as $__. If the last value has not been fetched from memory |
| 1723 | then don't fetch it now; instead mark it by voiding the $__ |
| 1724 | variable. */ |
| 1725 | if (value_lazy (last_examine_value.get ())) |
| 1726 | clear_internalvar (lookup_internalvar ("__")); |
| 1727 | else |
| 1728 | set_internalvar (lookup_internalvar ("__"), last_examine_value.get ()); |
| 1729 | } |
| 1730 | } |
| 1731 | \f |
| 1732 | |
| 1733 | /* Add an expression to the auto-display chain. |
| 1734 | Specify the expression. */ |
| 1735 | |
| 1736 | static void |
| 1737 | display_command (const char *arg, int from_tty) |
| 1738 | { |
| 1739 | struct format_data fmt; |
| 1740 | struct display *newobj; |
| 1741 | const char *exp = arg; |
| 1742 | |
| 1743 | if (exp == 0) |
| 1744 | { |
| 1745 | do_displays (); |
| 1746 | return; |
| 1747 | } |
| 1748 | |
| 1749 | if (*exp == '/') |
| 1750 | { |
| 1751 | exp++; |
| 1752 | fmt = decode_format (&exp, 0, 0); |
| 1753 | if (fmt.size && fmt.format == 0) |
| 1754 | fmt.format = 'x'; |
| 1755 | if (fmt.format == 'i' || fmt.format == 's') |
| 1756 | fmt.size = 'b'; |
| 1757 | } |
| 1758 | else |
| 1759 | { |
| 1760 | fmt.format = 0; |
| 1761 | fmt.size = 0; |
| 1762 | fmt.count = 0; |
| 1763 | fmt.raw = 0; |
| 1764 | } |
| 1765 | |
| 1766 | innermost_block_tracker tracker; |
| 1767 | expression_up expr = parse_expression (exp, &tracker); |
| 1768 | |
| 1769 | newobj = new display (); |
| 1770 | |
| 1771 | newobj->exp_string = xstrdup (exp); |
| 1772 | newobj->exp = std::move (expr); |
| 1773 | newobj->block = tracker.block (); |
| 1774 | newobj->pspace = current_program_space; |
| 1775 | newobj->number = ++display_number; |
| 1776 | newobj->format = fmt; |
| 1777 | newobj->enabled_p = 1; |
| 1778 | newobj->next = NULL; |
| 1779 | |
| 1780 | if (display_chain == NULL) |
| 1781 | display_chain = newobj; |
| 1782 | else |
| 1783 | { |
| 1784 | struct display *last; |
| 1785 | |
| 1786 | for (last = display_chain; last->next != NULL; last = last->next) |
| 1787 | ; |
| 1788 | last->next = newobj; |
| 1789 | } |
| 1790 | |
| 1791 | if (from_tty) |
| 1792 | do_one_display (newobj); |
| 1793 | |
| 1794 | dont_repeat (); |
| 1795 | } |
| 1796 | |
| 1797 | static void |
| 1798 | free_display (struct display *d) |
| 1799 | { |
| 1800 | xfree (d->exp_string); |
| 1801 | delete d; |
| 1802 | } |
| 1803 | |
| 1804 | /* Clear out the display_chain. Done when new symtabs are loaded, |
| 1805 | since this invalidates the types stored in many expressions. */ |
| 1806 | |
| 1807 | void |
| 1808 | clear_displays (void) |
| 1809 | { |
| 1810 | struct display *d; |
| 1811 | |
| 1812 | while ((d = display_chain) != NULL) |
| 1813 | { |
| 1814 | display_chain = d->next; |
| 1815 | free_display (d); |
| 1816 | } |
| 1817 | } |
| 1818 | |
| 1819 | /* Delete the auto-display DISPLAY. */ |
| 1820 | |
| 1821 | static void |
| 1822 | delete_display (struct display *display) |
| 1823 | { |
| 1824 | struct display *d; |
| 1825 | |
| 1826 | gdb_assert (display != NULL); |
| 1827 | |
| 1828 | if (display_chain == display) |
| 1829 | display_chain = display->next; |
| 1830 | |
| 1831 | ALL_DISPLAYS (d) |
| 1832 | if (d->next == display) |
| 1833 | { |
| 1834 | d->next = display->next; |
| 1835 | break; |
| 1836 | } |
| 1837 | |
| 1838 | free_display (display); |
| 1839 | } |
| 1840 | |
| 1841 | /* Call FUNCTION on each of the displays whose numbers are given in |
| 1842 | ARGS. DATA is passed unmodified to FUNCTION. */ |
| 1843 | |
| 1844 | static void |
| 1845 | map_display_numbers (const char *args, |
| 1846 | void (*function) (struct display *, |
| 1847 | void *), |
| 1848 | void *data) |
| 1849 | { |
| 1850 | int num; |
| 1851 | |
| 1852 | if (args == NULL) |
| 1853 | error_no_arg (_("one or more display numbers")); |
| 1854 | |
| 1855 | number_or_range_parser parser (args); |
| 1856 | |
| 1857 | while (!parser.finished ()) |
| 1858 | { |
| 1859 | const char *p = parser.cur_tok (); |
| 1860 | |
| 1861 | num = parser.get_number (); |
| 1862 | if (num == 0) |
| 1863 | warning (_("bad display number at or near '%s'"), p); |
| 1864 | else |
| 1865 | { |
| 1866 | struct display *d, *tmp; |
| 1867 | |
| 1868 | ALL_DISPLAYS_SAFE (d, tmp) |
| 1869 | if (d->number == num) |
| 1870 | break; |
| 1871 | if (d == NULL) |
| 1872 | printf_unfiltered (_("No display number %d.\n"), num); |
| 1873 | else |
| 1874 | function (d, data); |
| 1875 | } |
| 1876 | } |
| 1877 | } |
| 1878 | |
| 1879 | /* Callback for map_display_numbers, that deletes a display. */ |
| 1880 | |
| 1881 | static void |
| 1882 | do_delete_display (struct display *d, void *data) |
| 1883 | { |
| 1884 | delete_display (d); |
| 1885 | } |
| 1886 | |
| 1887 | /* "undisplay" command. */ |
| 1888 | |
| 1889 | static void |
| 1890 | undisplay_command (const char *args, int from_tty) |
| 1891 | { |
| 1892 | if (args == NULL) |
| 1893 | { |
| 1894 | if (query (_("Delete all auto-display expressions? "))) |
| 1895 | clear_displays (); |
| 1896 | dont_repeat (); |
| 1897 | return; |
| 1898 | } |
| 1899 | |
| 1900 | map_display_numbers (args, do_delete_display, NULL); |
| 1901 | dont_repeat (); |
| 1902 | } |
| 1903 | |
| 1904 | /* Display a single auto-display. |
| 1905 | Do nothing if the display cannot be printed in the current context, |
| 1906 | or if the display is disabled. */ |
| 1907 | |
| 1908 | static void |
| 1909 | do_one_display (struct display *d) |
| 1910 | { |
| 1911 | int within_current_scope; |
| 1912 | |
| 1913 | if (d->enabled_p == 0) |
| 1914 | return; |
| 1915 | |
| 1916 | /* The expression carries the architecture that was used at parse time. |
| 1917 | This is a problem if the expression depends on architecture features |
| 1918 | (e.g. register numbers), and the current architecture is now different. |
| 1919 | For example, a display statement like "display/i $pc" is expected to |
| 1920 | display the PC register of the current architecture, not the arch at |
| 1921 | the time the display command was given. Therefore, we re-parse the |
| 1922 | expression if the current architecture has changed. */ |
| 1923 | if (d->exp != NULL && d->exp->gdbarch != get_current_arch ()) |
| 1924 | { |
| 1925 | d->exp.reset (); |
| 1926 | d->block = NULL; |
| 1927 | } |
| 1928 | |
| 1929 | if (d->exp == NULL) |
| 1930 | { |
| 1931 | |
| 1932 | try |
| 1933 | { |
| 1934 | innermost_block_tracker tracker; |
| 1935 | d->exp = parse_expression (d->exp_string, &tracker); |
| 1936 | d->block = tracker.block (); |
| 1937 | } |
| 1938 | catch (const gdb_exception &ex) |
| 1939 | { |
| 1940 | /* Can't re-parse the expression. Disable this display item. */ |
| 1941 | d->enabled_p = 0; |
| 1942 | warning (_("Unable to display \"%s\": %s"), |
| 1943 | d->exp_string, ex.what ()); |
| 1944 | return; |
| 1945 | } |
| 1946 | } |
| 1947 | |
| 1948 | if (d->block) |
| 1949 | { |
| 1950 | if (d->pspace == current_program_space) |
| 1951 | within_current_scope = contained_in (get_selected_block (0), d->block, |
| 1952 | true); |
| 1953 | else |
| 1954 | within_current_scope = 0; |
| 1955 | } |
| 1956 | else |
| 1957 | within_current_scope = 1; |
| 1958 | if (!within_current_scope) |
| 1959 | return; |
| 1960 | |
| 1961 | scoped_restore save_display_number |
| 1962 | = make_scoped_restore (¤t_display_number, d->number); |
| 1963 | |
| 1964 | annotate_display_begin (); |
| 1965 | printf_filtered ("%d", d->number); |
| 1966 | annotate_display_number_end (); |
| 1967 | printf_filtered (": "); |
| 1968 | if (d->format.size) |
| 1969 | { |
| 1970 | |
| 1971 | annotate_display_format (); |
| 1972 | |
| 1973 | printf_filtered ("x/"); |
| 1974 | if (d->format.count != 1) |
| 1975 | printf_filtered ("%d", d->format.count); |
| 1976 | printf_filtered ("%c", d->format.format); |
| 1977 | if (d->format.format != 'i' && d->format.format != 's') |
| 1978 | printf_filtered ("%c", d->format.size); |
| 1979 | printf_filtered (" "); |
| 1980 | |
| 1981 | annotate_display_expression (); |
| 1982 | |
| 1983 | puts_filtered (d->exp_string); |
| 1984 | annotate_display_expression_end (); |
| 1985 | |
| 1986 | if (d->format.count != 1 || d->format.format == 'i') |
| 1987 | printf_filtered ("\n"); |
| 1988 | else |
| 1989 | printf_filtered (" "); |
| 1990 | |
| 1991 | annotate_display_value (); |
| 1992 | |
| 1993 | try |
| 1994 | { |
| 1995 | struct value *val; |
| 1996 | CORE_ADDR addr; |
| 1997 | |
| 1998 | val = evaluate_expression (d->exp.get ()); |
| 1999 | addr = value_as_address (val); |
| 2000 | if (d->format.format == 'i') |
| 2001 | addr = gdbarch_addr_bits_remove (d->exp->gdbarch, addr); |
| 2002 | do_examine (d->format, d->exp->gdbarch, addr); |
| 2003 | } |
| 2004 | catch (const gdb_exception_error &ex) |
| 2005 | { |
| 2006 | fprintf_filtered (gdb_stdout, _("%p[<error: %s>%p]\n"), |
| 2007 | metadata_style.style ().ptr (), ex.what (), |
| 2008 | nullptr); |
| 2009 | } |
| 2010 | } |
| 2011 | else |
| 2012 | { |
| 2013 | struct value_print_options opts; |
| 2014 | |
| 2015 | annotate_display_format (); |
| 2016 | |
| 2017 | if (d->format.format) |
| 2018 | printf_filtered ("/%c ", d->format.format); |
| 2019 | |
| 2020 | annotate_display_expression (); |
| 2021 | |
| 2022 | puts_filtered (d->exp_string); |
| 2023 | annotate_display_expression_end (); |
| 2024 | |
| 2025 | printf_filtered (" = "); |
| 2026 | |
| 2027 | annotate_display_expression (); |
| 2028 | |
| 2029 | get_formatted_print_options (&opts, d->format.format); |
| 2030 | opts.raw = d->format.raw; |
| 2031 | |
| 2032 | try |
| 2033 | { |
| 2034 | struct value *val; |
| 2035 | |
| 2036 | val = evaluate_expression (d->exp.get ()); |
| 2037 | print_formatted (val, d->format.size, &opts, gdb_stdout); |
| 2038 | } |
| 2039 | catch (const gdb_exception_error &ex) |
| 2040 | { |
| 2041 | fprintf_styled (gdb_stdout, metadata_style.style (), |
| 2042 | _("<error: %s>"), ex.what ()); |
| 2043 | } |
| 2044 | |
| 2045 | printf_filtered ("\n"); |
| 2046 | } |
| 2047 | |
| 2048 | annotate_display_end (); |
| 2049 | |
| 2050 | gdb_flush (gdb_stdout); |
| 2051 | } |
| 2052 | |
| 2053 | /* Display all of the values on the auto-display chain which can be |
| 2054 | evaluated in the current scope. */ |
| 2055 | |
| 2056 | void |
| 2057 | do_displays (void) |
| 2058 | { |
| 2059 | struct display *d; |
| 2060 | |
| 2061 | for (d = display_chain; d; d = d->next) |
| 2062 | do_one_display (d); |
| 2063 | } |
| 2064 | |
| 2065 | /* Delete the auto-display which we were in the process of displaying. |
| 2066 | This is done when there is an error or a signal. */ |
| 2067 | |
| 2068 | void |
| 2069 | disable_display (int num) |
| 2070 | { |
| 2071 | struct display *d; |
| 2072 | |
| 2073 | for (d = display_chain; d; d = d->next) |
| 2074 | if (d->number == num) |
| 2075 | { |
| 2076 | d->enabled_p = 0; |
| 2077 | return; |
| 2078 | } |
| 2079 | printf_unfiltered (_("No display number %d.\n"), num); |
| 2080 | } |
| 2081 | |
| 2082 | void |
| 2083 | disable_current_display (void) |
| 2084 | { |
| 2085 | if (current_display_number >= 0) |
| 2086 | { |
| 2087 | disable_display (current_display_number); |
| 2088 | fprintf_unfiltered (gdb_stderr, |
| 2089 | _("Disabling display %d to " |
| 2090 | "avoid infinite recursion.\n"), |
| 2091 | current_display_number); |
| 2092 | } |
| 2093 | current_display_number = -1; |
| 2094 | } |
| 2095 | |
| 2096 | static void |
| 2097 | info_display_command (const char *ignore, int from_tty) |
| 2098 | { |
| 2099 | struct display *d; |
| 2100 | |
| 2101 | if (!display_chain) |
| 2102 | printf_unfiltered (_("There are no auto-display expressions now.\n")); |
| 2103 | else |
| 2104 | printf_filtered (_("Auto-display expressions now in effect:\n\ |
| 2105 | Num Enb Expression\n")); |
| 2106 | |
| 2107 | for (d = display_chain; d; d = d->next) |
| 2108 | { |
| 2109 | printf_filtered ("%d: %c ", d->number, "ny"[(int) d->enabled_p]); |
| 2110 | if (d->format.size) |
| 2111 | printf_filtered ("/%d%c%c ", d->format.count, d->format.size, |
| 2112 | d->format.format); |
| 2113 | else if (d->format.format) |
| 2114 | printf_filtered ("/%c ", d->format.format); |
| 2115 | puts_filtered (d->exp_string); |
| 2116 | if (d->block && !contained_in (get_selected_block (0), d->block, true)) |
| 2117 | printf_filtered (_(" (cannot be evaluated in the current context)")); |
| 2118 | printf_filtered ("\n"); |
| 2119 | } |
| 2120 | } |
| 2121 | |
| 2122 | /* Callback fo map_display_numbers, that enables or disables the |
| 2123 | passed in display D. */ |
| 2124 | |
| 2125 | static void |
| 2126 | do_enable_disable_display (struct display *d, void *data) |
| 2127 | { |
| 2128 | d->enabled_p = *(int *) data; |
| 2129 | } |
| 2130 | |
| 2131 | /* Implementation of both the "disable display" and "enable display" |
| 2132 | commands. ENABLE decides what to do. */ |
| 2133 | |
| 2134 | static void |
| 2135 | enable_disable_display_command (const char *args, int from_tty, int enable) |
| 2136 | { |
| 2137 | if (args == NULL) |
| 2138 | { |
| 2139 | struct display *d; |
| 2140 | |
| 2141 | ALL_DISPLAYS (d) |
| 2142 | d->enabled_p = enable; |
| 2143 | return; |
| 2144 | } |
| 2145 | |
| 2146 | map_display_numbers (args, do_enable_disable_display, &enable); |
| 2147 | } |
| 2148 | |
| 2149 | /* The "enable display" command. */ |
| 2150 | |
| 2151 | static void |
| 2152 | enable_display_command (const char *args, int from_tty) |
| 2153 | { |
| 2154 | enable_disable_display_command (args, from_tty, 1); |
| 2155 | } |
| 2156 | |
| 2157 | /* The "disable display" command. */ |
| 2158 | |
| 2159 | static void |
| 2160 | disable_display_command (const char *args, int from_tty) |
| 2161 | { |
| 2162 | enable_disable_display_command (args, from_tty, 0); |
| 2163 | } |
| 2164 | |
| 2165 | /* display_chain items point to blocks and expressions. Some expressions in |
| 2166 | turn may point to symbols. |
| 2167 | Both symbols and blocks are obstack_alloc'd on objfile_stack, and are |
| 2168 | obstack_free'd when a shared library is unloaded. |
| 2169 | Clear pointers that are about to become dangling. |
| 2170 | Both .exp and .block fields will be restored next time we need to display |
| 2171 | an item by re-parsing .exp_string field in the new execution context. */ |
| 2172 | |
| 2173 | static void |
| 2174 | clear_dangling_display_expressions (struct objfile *objfile) |
| 2175 | { |
| 2176 | struct display *d; |
| 2177 | struct program_space *pspace; |
| 2178 | |
| 2179 | /* With no symbol file we cannot have a block or expression from it. */ |
| 2180 | if (objfile == NULL) |
| 2181 | return; |
| 2182 | pspace = objfile->pspace; |
| 2183 | if (objfile->separate_debug_objfile_backlink) |
| 2184 | { |
| 2185 | objfile = objfile->separate_debug_objfile_backlink; |
| 2186 | gdb_assert (objfile->pspace == pspace); |
| 2187 | } |
| 2188 | |
| 2189 | for (d = display_chain; d != NULL; d = d->next) |
| 2190 | { |
| 2191 | if (d->pspace != pspace) |
| 2192 | continue; |
| 2193 | |
| 2194 | if (lookup_objfile_from_block (d->block) == objfile |
| 2195 | || (d->exp != NULL && exp_uses_objfile (d->exp.get (), objfile))) |
| 2196 | { |
| 2197 | d->exp.reset (); |
| 2198 | d->block = NULL; |
| 2199 | } |
| 2200 | } |
| 2201 | } |
| 2202 | \f |
| 2203 | |
| 2204 | /* Print the value in stack frame FRAME of a variable specified by a |
| 2205 | struct symbol. NAME is the name to print; if NULL then VAR's print |
| 2206 | name will be used. STREAM is the ui_file on which to print the |
| 2207 | value. INDENT specifies the number of indent levels to print |
| 2208 | before printing the variable name. |
| 2209 | |
| 2210 | This function invalidates FRAME. */ |
| 2211 | |
| 2212 | void |
| 2213 | print_variable_and_value (const char *name, struct symbol *var, |
| 2214 | struct frame_info *frame, |
| 2215 | struct ui_file *stream, int indent) |
| 2216 | { |
| 2217 | |
| 2218 | if (!name) |
| 2219 | name = var->print_name (); |
| 2220 | |
| 2221 | fprintf_filtered (stream, "%s%ps = ", n_spaces (2 * indent), |
| 2222 | styled_string (variable_name_style.style (), name)); |
| 2223 | |
| 2224 | try |
| 2225 | { |
| 2226 | struct value *val; |
| 2227 | struct value_print_options opts; |
| 2228 | |
| 2229 | /* READ_VAR_VALUE needs a block in order to deal with non-local |
| 2230 | references (i.e. to handle nested functions). In this context, we |
| 2231 | print variables that are local to this frame, so we can avoid passing |
| 2232 | a block to it. */ |
| 2233 | val = read_var_value (var, NULL, frame); |
| 2234 | get_user_print_options (&opts); |
| 2235 | opts.deref_ref = 1; |
| 2236 | common_val_print (val, stream, indent, &opts, current_language); |
| 2237 | |
| 2238 | /* common_val_print invalidates FRAME when a pretty printer calls inferior |
| 2239 | function. */ |
| 2240 | frame = NULL; |
| 2241 | } |
| 2242 | catch (const gdb_exception_error &except) |
| 2243 | { |
| 2244 | fprintf_styled (stream, metadata_style.style (), |
| 2245 | "<error reading variable %s (%s)>", name, |
| 2246 | except.what ()); |
| 2247 | } |
| 2248 | |
| 2249 | fprintf_filtered (stream, "\n"); |
| 2250 | } |
| 2251 | |
| 2252 | /* Subroutine of ui_printf to simplify it. |
| 2253 | Print VALUE to STREAM using FORMAT. |
| 2254 | VALUE is a C-style string either on the target or |
| 2255 | in a GDB internal variable. */ |
| 2256 | |
| 2257 | static void |
| 2258 | printf_c_string (struct ui_file *stream, const char *format, |
| 2259 | struct value *value) |
| 2260 | { |
| 2261 | const gdb_byte *str; |
| 2262 | |
| 2263 | if (VALUE_LVAL (value) == lval_internalvar |
| 2264 | && c_is_string_type_p (value_type (value))) |
| 2265 | { |
| 2266 | size_t len = TYPE_LENGTH (value_type (value)); |
| 2267 | |
| 2268 | /* Copy the internal var value to TEM_STR and append a terminating null |
| 2269 | character. This protects against corrupted C-style strings that lack |
| 2270 | the terminating null char. It also allows Ada-style strings (not |
| 2271 | null terminated) to be printed without problems. */ |
| 2272 | gdb_byte *tem_str = (gdb_byte *) alloca (len + 1); |
| 2273 | |
| 2274 | memcpy (tem_str, value_contents (value), len); |
| 2275 | tem_str [len] = 0; |
| 2276 | str = tem_str; |
| 2277 | } |
| 2278 | else |
| 2279 | { |
| 2280 | CORE_ADDR tem = value_as_address (value);; |
| 2281 | |
| 2282 | if (tem == 0) |
| 2283 | { |
| 2284 | DIAGNOSTIC_PUSH |
| 2285 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2286 | fprintf_filtered (stream, format, "(null)"); |
| 2287 | DIAGNOSTIC_POP |
| 2288 | return; |
| 2289 | } |
| 2290 | |
| 2291 | /* This is a %s argument. Find the length of the string. */ |
| 2292 | size_t len; |
| 2293 | |
| 2294 | for (len = 0;; len++) |
| 2295 | { |
| 2296 | gdb_byte c; |
| 2297 | |
| 2298 | QUIT; |
| 2299 | read_memory (tem + len, &c, 1); |
| 2300 | if (c == 0) |
| 2301 | break; |
| 2302 | } |
| 2303 | |
| 2304 | /* Copy the string contents into a string inside GDB. */ |
| 2305 | gdb_byte *tem_str = (gdb_byte *) alloca (len + 1); |
| 2306 | |
| 2307 | if (len != 0) |
| 2308 | read_memory (tem, tem_str, len); |
| 2309 | tem_str[len] = 0; |
| 2310 | str = tem_str; |
| 2311 | } |
| 2312 | |
| 2313 | DIAGNOSTIC_PUSH |
| 2314 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2315 | fprintf_filtered (stream, format, (char *) str); |
| 2316 | DIAGNOSTIC_POP |
| 2317 | } |
| 2318 | |
| 2319 | /* Subroutine of ui_printf to simplify it. |
| 2320 | Print VALUE to STREAM using FORMAT. |
| 2321 | VALUE is a wide C-style string on the target or |
| 2322 | in a GDB internal variable. */ |
| 2323 | |
| 2324 | static void |
| 2325 | printf_wide_c_string (struct ui_file *stream, const char *format, |
| 2326 | struct value *value) |
| 2327 | { |
| 2328 | const gdb_byte *str; |
| 2329 | size_t len; |
| 2330 | struct gdbarch *gdbarch = get_type_arch (value_type (value)); |
| 2331 | struct type *wctype = lookup_typename (current_language, |
| 2332 | "wchar_t", NULL, 0); |
| 2333 | int wcwidth = TYPE_LENGTH (wctype); |
| 2334 | |
| 2335 | if (VALUE_LVAL (value) == lval_internalvar |
| 2336 | && c_is_string_type_p (value_type (value))) |
| 2337 | { |
| 2338 | str = value_contents (value); |
| 2339 | len = TYPE_LENGTH (value_type (value)); |
| 2340 | } |
| 2341 | else |
| 2342 | { |
| 2343 | CORE_ADDR tem = value_as_address (value); |
| 2344 | |
| 2345 | if (tem == 0) |
| 2346 | { |
| 2347 | DIAGNOSTIC_PUSH |
| 2348 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2349 | fprintf_filtered (stream, format, "(null)"); |
| 2350 | DIAGNOSTIC_POP |
| 2351 | return; |
| 2352 | } |
| 2353 | |
| 2354 | /* This is a %s argument. Find the length of the string. */ |
| 2355 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 2356 | gdb_byte *buf = (gdb_byte *) alloca (wcwidth); |
| 2357 | |
| 2358 | for (len = 0;; len += wcwidth) |
| 2359 | { |
| 2360 | QUIT; |
| 2361 | read_memory (tem + len, buf, wcwidth); |
| 2362 | if (extract_unsigned_integer (buf, wcwidth, byte_order) == 0) |
| 2363 | break; |
| 2364 | } |
| 2365 | |
| 2366 | /* Copy the string contents into a string inside GDB. */ |
| 2367 | gdb_byte *tem_str = (gdb_byte *) alloca (len + wcwidth); |
| 2368 | |
| 2369 | if (len != 0) |
| 2370 | read_memory (tem, tem_str, len); |
| 2371 | memset (&tem_str[len], 0, wcwidth); |
| 2372 | str = tem_str; |
| 2373 | } |
| 2374 | |
| 2375 | auto_obstack output; |
| 2376 | |
| 2377 | convert_between_encodings (target_wide_charset (gdbarch), |
| 2378 | host_charset (), |
| 2379 | str, len, wcwidth, |
| 2380 | &output, translit_char); |
| 2381 | obstack_grow_str0 (&output, ""); |
| 2382 | |
| 2383 | DIAGNOSTIC_PUSH |
| 2384 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2385 | fprintf_filtered (stream, format, obstack_base (&output)); |
| 2386 | DIAGNOSTIC_POP |
| 2387 | } |
| 2388 | |
| 2389 | /* Subroutine of ui_printf to simplify it. |
| 2390 | Print VALUE, a floating point value, to STREAM using FORMAT. */ |
| 2391 | |
| 2392 | static void |
| 2393 | printf_floating (struct ui_file *stream, const char *format, |
| 2394 | struct value *value, enum argclass argclass) |
| 2395 | { |
| 2396 | /* Parameter data. */ |
| 2397 | struct type *param_type = value_type (value); |
| 2398 | struct gdbarch *gdbarch = get_type_arch (param_type); |
| 2399 | |
| 2400 | /* Determine target type corresponding to the format string. */ |
| 2401 | struct type *fmt_type; |
| 2402 | switch (argclass) |
| 2403 | { |
| 2404 | case double_arg: |
| 2405 | fmt_type = builtin_type (gdbarch)->builtin_double; |
| 2406 | break; |
| 2407 | case long_double_arg: |
| 2408 | fmt_type = builtin_type (gdbarch)->builtin_long_double; |
| 2409 | break; |
| 2410 | case dec32float_arg: |
| 2411 | fmt_type = builtin_type (gdbarch)->builtin_decfloat; |
| 2412 | break; |
| 2413 | case dec64float_arg: |
| 2414 | fmt_type = builtin_type (gdbarch)->builtin_decdouble; |
| 2415 | break; |
| 2416 | case dec128float_arg: |
| 2417 | fmt_type = builtin_type (gdbarch)->builtin_declong; |
| 2418 | break; |
| 2419 | default: |
| 2420 | gdb_assert_not_reached ("unexpected argument class"); |
| 2421 | } |
| 2422 | |
| 2423 | /* To match the traditional GDB behavior, the conversion is |
| 2424 | done differently depending on the type of the parameter: |
| 2425 | |
| 2426 | - if the parameter has floating-point type, it's value |
| 2427 | is converted to the target type; |
| 2428 | |
| 2429 | - otherwise, if the parameter has a type that is of the |
| 2430 | same size as a built-in floating-point type, the value |
| 2431 | bytes are interpreted as if they were of that type, and |
| 2432 | then converted to the target type (this is not done for |
| 2433 | decimal floating-point argument classes); |
| 2434 | |
| 2435 | - otherwise, if the source value has an integer value, |
| 2436 | it's value is converted to the target type; |
| 2437 | |
| 2438 | - otherwise, an error is raised. |
| 2439 | |
| 2440 | In either case, the result of the conversion is a byte buffer |
| 2441 | formatted in the target format for the target type. */ |
| 2442 | |
| 2443 | if (TYPE_CODE (fmt_type) == TYPE_CODE_FLT) |
| 2444 | { |
| 2445 | param_type = float_type_from_length (param_type); |
| 2446 | if (param_type != value_type (value)) |
| 2447 | value = value_from_contents (param_type, value_contents (value)); |
| 2448 | } |
| 2449 | |
| 2450 | value = value_cast (fmt_type, value); |
| 2451 | |
| 2452 | /* Convert the value to a string and print it. */ |
| 2453 | std::string str |
| 2454 | = target_float_to_string (value_contents (value), fmt_type, format); |
| 2455 | fputs_filtered (str.c_str (), stream); |
| 2456 | } |
| 2457 | |
| 2458 | /* Subroutine of ui_printf to simplify it. |
| 2459 | Print VALUE, a target pointer, to STREAM using FORMAT. */ |
| 2460 | |
| 2461 | static void |
| 2462 | printf_pointer (struct ui_file *stream, const char *format, |
| 2463 | struct value *value) |
| 2464 | { |
| 2465 | /* We avoid the host's %p because pointers are too |
| 2466 | likely to be the wrong size. The only interesting |
| 2467 | modifier for %p is a width; extract that, and then |
| 2468 | handle %p as glibc would: %#x or a literal "(nil)". */ |
| 2469 | |
| 2470 | const char *p; |
| 2471 | char *fmt, *fmt_p; |
| 2472 | #ifdef PRINTF_HAS_LONG_LONG |
| 2473 | long long val = value_as_long (value); |
| 2474 | #else |
| 2475 | long val = value_as_long (value); |
| 2476 | #endif |
| 2477 | |
| 2478 | fmt = (char *) alloca (strlen (format) + 5); |
| 2479 | |
| 2480 | /* Copy up to the leading %. */ |
| 2481 | p = format; |
| 2482 | fmt_p = fmt; |
| 2483 | while (*p) |
| 2484 | { |
| 2485 | int is_percent = (*p == '%'); |
| 2486 | |
| 2487 | *fmt_p++ = *p++; |
| 2488 | if (is_percent) |
| 2489 | { |
| 2490 | if (*p == '%') |
| 2491 | *fmt_p++ = *p++; |
| 2492 | else |
| 2493 | break; |
| 2494 | } |
| 2495 | } |
| 2496 | |
| 2497 | if (val != 0) |
| 2498 | *fmt_p++ = '#'; |
| 2499 | |
| 2500 | /* Copy any width or flags. Only the "-" flag is valid for pointers |
| 2501 | -- see the format_pieces constructor. */ |
| 2502 | while (*p == '-' || (*p >= '0' && *p < '9')) |
| 2503 | *fmt_p++ = *p++; |
| 2504 | |
| 2505 | gdb_assert (*p == 'p' && *(p + 1) == '\0'); |
| 2506 | if (val != 0) |
| 2507 | { |
| 2508 | #ifdef PRINTF_HAS_LONG_LONG |
| 2509 | *fmt_p++ = 'l'; |
| 2510 | #endif |
| 2511 | *fmt_p++ = 'l'; |
| 2512 | *fmt_p++ = 'x'; |
| 2513 | *fmt_p++ = '\0'; |
| 2514 | DIAGNOSTIC_PUSH |
| 2515 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2516 | fprintf_filtered (stream, fmt, val); |
| 2517 | DIAGNOSTIC_POP |
| 2518 | } |
| 2519 | else |
| 2520 | { |
| 2521 | *fmt_p++ = 's'; |
| 2522 | *fmt_p++ = '\0'; |
| 2523 | DIAGNOSTIC_PUSH |
| 2524 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2525 | fprintf_filtered (stream, fmt, "(nil)"); |
| 2526 | DIAGNOSTIC_POP |
| 2527 | } |
| 2528 | } |
| 2529 | |
| 2530 | /* printf "printf format string" ARG to STREAM. */ |
| 2531 | |
| 2532 | static void |
| 2533 | ui_printf (const char *arg, struct ui_file *stream) |
| 2534 | { |
| 2535 | const char *s = arg; |
| 2536 | std::vector<struct value *> val_args; |
| 2537 | |
| 2538 | if (s == 0) |
| 2539 | error_no_arg (_("format-control string and values to print")); |
| 2540 | |
| 2541 | s = skip_spaces (s); |
| 2542 | |
| 2543 | /* A format string should follow, enveloped in double quotes. */ |
| 2544 | if (*s++ != '"') |
| 2545 | error (_("Bad format string, missing '\"'.")); |
| 2546 | |
| 2547 | format_pieces fpieces (&s); |
| 2548 | |
| 2549 | if (*s++ != '"') |
| 2550 | error (_("Bad format string, non-terminated '\"'.")); |
| 2551 | |
| 2552 | s = skip_spaces (s); |
| 2553 | |
| 2554 | if (*s != ',' && *s != 0) |
| 2555 | error (_("Invalid argument syntax")); |
| 2556 | |
| 2557 | if (*s == ',') |
| 2558 | s++; |
| 2559 | s = skip_spaces (s); |
| 2560 | |
| 2561 | { |
| 2562 | int nargs_wanted; |
| 2563 | int i; |
| 2564 | const char *current_substring; |
| 2565 | |
| 2566 | nargs_wanted = 0; |
| 2567 | for (auto &&piece : fpieces) |
| 2568 | if (piece.argclass != literal_piece) |
| 2569 | ++nargs_wanted; |
| 2570 | |
| 2571 | /* Now, parse all arguments and evaluate them. |
| 2572 | Store the VALUEs in VAL_ARGS. */ |
| 2573 | |
| 2574 | while (*s != '\0') |
| 2575 | { |
| 2576 | const char *s1; |
| 2577 | |
| 2578 | s1 = s; |
| 2579 | val_args.push_back (parse_to_comma_and_eval (&s1)); |
| 2580 | |
| 2581 | s = s1; |
| 2582 | if (*s == ',') |
| 2583 | s++; |
| 2584 | } |
| 2585 | |
| 2586 | if (val_args.size () != nargs_wanted) |
| 2587 | error (_("Wrong number of arguments for specified format-string")); |
| 2588 | |
| 2589 | /* Now actually print them. */ |
| 2590 | i = 0; |
| 2591 | for (auto &&piece : fpieces) |
| 2592 | { |
| 2593 | current_substring = piece.string; |
| 2594 | switch (piece.argclass) |
| 2595 | { |
| 2596 | case string_arg: |
| 2597 | printf_c_string (stream, current_substring, val_args[i]); |
| 2598 | break; |
| 2599 | case wide_string_arg: |
| 2600 | printf_wide_c_string (stream, current_substring, val_args[i]); |
| 2601 | break; |
| 2602 | case wide_char_arg: |
| 2603 | { |
| 2604 | struct gdbarch *gdbarch |
| 2605 | = get_type_arch (value_type (val_args[i])); |
| 2606 | struct type *wctype = lookup_typename (current_language, |
| 2607 | "wchar_t", NULL, 0); |
| 2608 | struct type *valtype; |
| 2609 | const gdb_byte *bytes; |
| 2610 | |
| 2611 | valtype = value_type (val_args[i]); |
| 2612 | if (TYPE_LENGTH (valtype) != TYPE_LENGTH (wctype) |
| 2613 | || TYPE_CODE (valtype) != TYPE_CODE_INT) |
| 2614 | error (_("expected wchar_t argument for %%lc")); |
| 2615 | |
| 2616 | bytes = value_contents (val_args[i]); |
| 2617 | |
| 2618 | auto_obstack output; |
| 2619 | |
| 2620 | convert_between_encodings (target_wide_charset (gdbarch), |
| 2621 | host_charset (), |
| 2622 | bytes, TYPE_LENGTH (valtype), |
| 2623 | TYPE_LENGTH (valtype), |
| 2624 | &output, translit_char); |
| 2625 | obstack_grow_str0 (&output, ""); |
| 2626 | |
| 2627 | DIAGNOSTIC_PUSH |
| 2628 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2629 | fprintf_filtered (stream, current_substring, |
| 2630 | obstack_base (&output)); |
| 2631 | DIAGNOSTIC_POP |
| 2632 | } |
| 2633 | break; |
| 2634 | case long_long_arg: |
| 2635 | #ifdef PRINTF_HAS_LONG_LONG |
| 2636 | { |
| 2637 | long long val = value_as_long (val_args[i]); |
| 2638 | |
| 2639 | DIAGNOSTIC_PUSH |
| 2640 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2641 | fprintf_filtered (stream, current_substring, val); |
| 2642 | DIAGNOSTIC_POP |
| 2643 | break; |
| 2644 | } |
| 2645 | #else |
| 2646 | error (_("long long not supported in printf")); |
| 2647 | #endif |
| 2648 | case int_arg: |
| 2649 | { |
| 2650 | int val = value_as_long (val_args[i]); |
| 2651 | |
| 2652 | DIAGNOSTIC_PUSH |
| 2653 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2654 | fprintf_filtered (stream, current_substring, val); |
| 2655 | DIAGNOSTIC_POP |
| 2656 | break; |
| 2657 | } |
| 2658 | case long_arg: |
| 2659 | { |
| 2660 | long val = value_as_long (val_args[i]); |
| 2661 | |
| 2662 | DIAGNOSTIC_PUSH |
| 2663 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2664 | fprintf_filtered (stream, current_substring, val); |
| 2665 | DIAGNOSTIC_POP |
| 2666 | break; |
| 2667 | } |
| 2668 | case size_t_arg: |
| 2669 | { |
| 2670 | size_t val = value_as_long (val_args[i]); |
| 2671 | |
| 2672 | DIAGNOSTIC_PUSH |
| 2673 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2674 | fprintf_filtered (stream, current_substring, val); |
| 2675 | DIAGNOSTIC_POP |
| 2676 | break; |
| 2677 | } |
| 2678 | /* Handles floating-point values. */ |
| 2679 | case double_arg: |
| 2680 | case long_double_arg: |
| 2681 | case dec32float_arg: |
| 2682 | case dec64float_arg: |
| 2683 | case dec128float_arg: |
| 2684 | printf_floating (stream, current_substring, val_args[i], |
| 2685 | piece.argclass); |
| 2686 | break; |
| 2687 | case ptr_arg: |
| 2688 | printf_pointer (stream, current_substring, val_args[i]); |
| 2689 | break; |
| 2690 | case literal_piece: |
| 2691 | /* Print a portion of the format string that has no |
| 2692 | directives. Note that this will not include any |
| 2693 | ordinary %-specs, but it might include "%%". That is |
| 2694 | why we use printf_filtered and not puts_filtered here. |
| 2695 | Also, we pass a dummy argument because some platforms |
| 2696 | have modified GCC to include -Wformat-security by |
| 2697 | default, which will warn here if there is no |
| 2698 | argument. */ |
| 2699 | DIAGNOSTIC_PUSH |
| 2700 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL |
| 2701 | fprintf_filtered (stream, current_substring, 0); |
| 2702 | DIAGNOSTIC_POP |
| 2703 | break; |
| 2704 | default: |
| 2705 | internal_error (__FILE__, __LINE__, |
| 2706 | _("failed internal consistency check")); |
| 2707 | } |
| 2708 | /* Maybe advance to the next argument. */ |
| 2709 | if (piece.argclass != literal_piece) |
| 2710 | ++i; |
| 2711 | } |
| 2712 | } |
| 2713 | } |
| 2714 | |
| 2715 | /* Implement the "printf" command. */ |
| 2716 | |
| 2717 | static void |
| 2718 | printf_command (const char *arg, int from_tty) |
| 2719 | { |
| 2720 | ui_printf (arg, gdb_stdout); |
| 2721 | reset_terminal_style (gdb_stdout); |
| 2722 | wrap_here (""); |
| 2723 | gdb_flush (gdb_stdout); |
| 2724 | } |
| 2725 | |
| 2726 | /* Implement the "eval" command. */ |
| 2727 | |
| 2728 | static void |
| 2729 | eval_command (const char *arg, int from_tty) |
| 2730 | { |
| 2731 | string_file stb; |
| 2732 | |
| 2733 | ui_printf (arg, &stb); |
| 2734 | |
| 2735 | std::string expanded = insert_user_defined_cmd_args (stb.c_str ()); |
| 2736 | |
| 2737 | execute_command (expanded.c_str (), from_tty); |
| 2738 | } |
| 2739 | |
| 2740 | void |
| 2741 | _initialize_printcmd (void) |
| 2742 | { |
| 2743 | struct cmd_list_element *c; |
| 2744 | |
| 2745 | current_display_number = -1; |
| 2746 | |
| 2747 | gdb::observers::free_objfile.attach (clear_dangling_display_expressions); |
| 2748 | |
| 2749 | add_info ("address", info_address_command, |
| 2750 | _("Describe where symbol SYM is stored.\n\ |
| 2751 | Usage: info address SYM")); |
| 2752 | |
| 2753 | add_info ("symbol", info_symbol_command, _("\ |
| 2754 | Describe what symbol is at location ADDR.\n\ |
| 2755 | Usage: info symbol ADDR\n\ |
| 2756 | Only for symbols with fixed locations (global or static scope).")); |
| 2757 | |
| 2758 | add_com ("x", class_vars, x_command, _("\ |
| 2759 | Examine memory: x/FMT ADDRESS.\n\ |
| 2760 | ADDRESS is an expression for the memory address to examine.\n\ |
| 2761 | FMT is a repeat count followed by a format letter and a size letter.\n\ |
| 2762 | Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\ |
| 2763 | t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\ |
| 2764 | and z(hex, zero padded on the left).\n\ |
| 2765 | Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\ |
| 2766 | The specified number of objects of the specified size are printed\n\ |
| 2767 | according to the format. If a negative number is specified, memory is\n\ |
| 2768 | examined backward from the address.\n\n\ |
| 2769 | Defaults for format and size letters are those previously used.\n\ |
| 2770 | Default count is 1. Default address is following last thing printed\n\ |
| 2771 | with this command or \"print\".")); |
| 2772 | |
| 2773 | add_info ("display", info_display_command, _("\ |
| 2774 | Expressions to display when program stops, with code numbers.\n\ |
| 2775 | Usage: info display")); |
| 2776 | |
| 2777 | add_cmd ("undisplay", class_vars, undisplay_command, _("\ |
| 2778 | Cancel some expressions to be displayed when program stops.\n\ |
| 2779 | Usage: undisplay [NUM]...\n\ |
| 2780 | Arguments are the code numbers of the expressions to stop displaying.\n\ |
| 2781 | No argument means cancel all automatic-display expressions.\n\ |
| 2782 | \"delete display\" has the same effect as this command.\n\ |
| 2783 | Do \"info display\" to see current list of code numbers."), |
| 2784 | &cmdlist); |
| 2785 | |
| 2786 | add_com ("display", class_vars, display_command, _("\ |
| 2787 | Print value of expression EXP each time the program stops.\n\ |
| 2788 | Usage: display[/FMT] EXP\n\ |
| 2789 | /FMT may be used before EXP as in the \"print\" command.\n\ |
| 2790 | /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\ |
| 2791 | as in the \"x\" command, and then EXP is used to get the address to examine\n\ |
| 2792 | and examining is done as in the \"x\" command.\n\n\ |
| 2793 | With no argument, display all currently requested auto-display expressions.\n\ |
| 2794 | Use \"undisplay\" to cancel display requests previously made.")); |
| 2795 | |
| 2796 | add_cmd ("display", class_vars, enable_display_command, _("\ |
| 2797 | Enable some expressions to be displayed when program stops.\n\ |
| 2798 | Usage: enable display [NUM]...\n\ |
| 2799 | Arguments are the code numbers of the expressions to resume displaying.\n\ |
| 2800 | No argument means enable all automatic-display expressions.\n\ |
| 2801 | Do \"info display\" to see current list of code numbers."), &enablelist); |
| 2802 | |
| 2803 | add_cmd ("display", class_vars, disable_display_command, _("\ |
| 2804 | Disable some expressions to be displayed when program stops.\n\ |
| 2805 | Usage: disable display [NUM]...\n\ |
| 2806 | Arguments are the code numbers of the expressions to stop displaying.\n\ |
| 2807 | No argument means disable all automatic-display expressions.\n\ |
| 2808 | Do \"info display\" to see current list of code numbers."), &disablelist); |
| 2809 | |
| 2810 | add_cmd ("display", class_vars, undisplay_command, _("\ |
| 2811 | Cancel some expressions to be displayed when program stops.\n\ |
| 2812 | Usage: delete display [NUM]...\n\ |
| 2813 | Arguments are the code numbers of the expressions to stop displaying.\n\ |
| 2814 | No argument means cancel all automatic-display expressions.\n\ |
| 2815 | Do \"info display\" to see current list of code numbers."), &deletelist); |
| 2816 | |
| 2817 | add_com ("printf", class_vars, printf_command, _("\ |
| 2818 | Formatted printing, like the C \"printf\" function.\n\ |
| 2819 | Usage: printf \"format string\", ARG1, ARG2, ARG3, ..., ARGN\n\ |
| 2820 | This supports most C printf format specifications, like %s, %d, etc.")); |
| 2821 | |
| 2822 | add_com ("output", class_vars, output_command, _("\ |
| 2823 | Like \"print\" but don't put in value history and don't print newline.\n\ |
| 2824 | Usage: output EXP\n\ |
| 2825 | This is useful in user-defined commands.")); |
| 2826 | |
| 2827 | add_prefix_cmd ("set", class_vars, set_command, _("\ |
| 2828 | Evaluate expression EXP and assign result to variable VAR.\n\ |
| 2829 | Usage: set VAR = EXP\n\ |
| 2830 | This uses assignment syntax appropriate for the current language\n\ |
| 2831 | (VAR = EXP or VAR := EXP for example).\n\ |
| 2832 | VAR may be a debugger \"convenience\" variable (names starting\n\ |
| 2833 | with $), a register (a few standard names starting with $), or an actual\n\ |
| 2834 | variable in the program being debugged. EXP is any valid expression.\n\ |
| 2835 | Use \"set variable\" for variables with names identical to set subcommands.\n\ |
| 2836 | \n\ |
| 2837 | With a subcommand, this command modifies parts of the gdb environment.\n\ |
| 2838 | You can see these environment settings with the \"show\" command."), |
| 2839 | &setlist, "set ", 1, &cmdlist); |
| 2840 | if (dbx_commands) |
| 2841 | add_com ("assign", class_vars, set_command, _("\ |
| 2842 | Evaluate expression EXP and assign result to variable VAR.\n\ |
| 2843 | Usage: assign VAR = EXP\n\ |
| 2844 | This uses assignment syntax appropriate for the current language\n\ |
| 2845 | (VAR = EXP or VAR := EXP for example).\n\ |
| 2846 | VAR may be a debugger \"convenience\" variable (names starting\n\ |
| 2847 | with $), a register (a few standard names starting with $), or an actual\n\ |
| 2848 | variable in the program being debugged. EXP is any valid expression.\n\ |
| 2849 | Use \"set variable\" for variables with names identical to set subcommands.\n\ |
| 2850 | \nWith a subcommand, this command modifies parts of the gdb environment.\n\ |
| 2851 | You can see these environment settings with the \"show\" command.")); |
| 2852 | |
| 2853 | /* "call" is the same as "set", but handy for dbx users to call fns. */ |
| 2854 | c = add_com ("call", class_vars, call_command, _("\ |
| 2855 | Call a function in the program.\n\ |
| 2856 | Usage: call EXP\n\ |
| 2857 | The argument is the function name and arguments, in the notation of the\n\ |
| 2858 | current working language. The result is printed and saved in the value\n\ |
| 2859 | history, if it is not void.")); |
| 2860 | set_cmd_completer_handle_brkchars (c, print_command_completer); |
| 2861 | |
| 2862 | add_cmd ("variable", class_vars, set_command, _("\ |
| 2863 | Evaluate expression EXP and assign result to variable VAR.\n\ |
| 2864 | Usage: set variable VAR = EXP\n\ |
| 2865 | This uses assignment syntax appropriate for the current language\n\ |
| 2866 | (VAR = EXP or VAR := EXP for example).\n\ |
| 2867 | VAR may be a debugger \"convenience\" variable (names starting\n\ |
| 2868 | with $), a register (a few standard names starting with $), or an actual\n\ |
| 2869 | variable in the program being debugged. EXP is any valid expression.\n\ |
| 2870 | This may usually be abbreviated to simply \"set\"."), |
| 2871 | &setlist); |
| 2872 | add_alias_cmd ("var", "variable", class_vars, 0, &setlist); |
| 2873 | |
| 2874 | const auto print_opts = make_value_print_options_def_group (nullptr); |
| 2875 | |
| 2876 | static const std::string print_help = gdb::option::build_help (_("\ |
| 2877 | Print value of expression EXP.\n\ |
| 2878 | Usage: print [[OPTION]... --] [/FMT] [EXP]\n\ |
| 2879 | \n\ |
| 2880 | Options:\n\ |
| 2881 | %OPTIONS%\n\ |
| 2882 | \n\ |
| 2883 | Note: because this command accepts arbitrary expressions, if you\n\ |
| 2884 | specify any command option, you must use a double dash (\"--\")\n\ |
| 2885 | to mark the end of option processing. E.g.: \"print -o -- myobj\".\n\ |
| 2886 | \n\ |
| 2887 | Variables accessible are those of the lexical environment of the selected\n\ |
| 2888 | stack frame, plus all those whose scope is global or an entire file.\n\ |
| 2889 | \n\ |
| 2890 | $NUM gets previous value number NUM. $ and $$ are the last two values.\n\ |
| 2891 | $$NUM refers to NUM'th value back from the last one.\n\ |
| 2892 | Names starting with $ refer to registers (with the values they would have\n\ |
| 2893 | if the program were to return to the stack frame now selected, restoring\n\ |
| 2894 | all registers saved by frames farther in) or else to debugger\n\ |
| 2895 | \"convenience\" variables (any such name not a known register).\n\ |
| 2896 | Use assignment expressions to give values to convenience variables.\n\ |
| 2897 | \n\ |
| 2898 | {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\ |
| 2899 | @ is a binary operator for treating consecutive data objects\n\ |
| 2900 | anywhere in memory as an array. FOO@NUM gives an array whose first\n\ |
| 2901 | element is FOO, whose second element is stored in the space following\n\ |
| 2902 | where FOO is stored, etc. FOO must be an expression whose value\n\ |
| 2903 | resides in memory.\n\ |
| 2904 | \n\ |
| 2905 | EXP may be preceded with /FMT, where FMT is a format letter\n\ |
| 2906 | but no count or size letter (see \"x\" command)."), |
| 2907 | print_opts); |
| 2908 | |
| 2909 | c = add_com ("print", class_vars, print_command, print_help.c_str ()); |
| 2910 | set_cmd_completer_handle_brkchars (c, print_command_completer); |
| 2911 | add_com_alias ("p", "print", class_vars, 1); |
| 2912 | add_com_alias ("inspect", "print", class_vars, 1); |
| 2913 | |
| 2914 | add_setshow_uinteger_cmd ("max-symbolic-offset", no_class, |
| 2915 | &max_symbolic_offset, _("\ |
| 2916 | Set the largest offset that will be printed in <SYMBOL+1234> form."), _("\ |
| 2917 | Show the largest offset that will be printed in <SYMBOL+1234> form."), _("\ |
| 2918 | Tell GDB to only display the symbolic form of an address if the\n\ |
| 2919 | offset between the closest earlier symbol and the address is less than\n\ |
| 2920 | the specified maximum offset. The default is \"unlimited\", which tells GDB\n\ |
| 2921 | to always print the symbolic form of an address if any symbol precedes\n\ |
| 2922 | it. Zero is equivalent to \"unlimited\"."), |
| 2923 | NULL, |
| 2924 | show_max_symbolic_offset, |
| 2925 | &setprintlist, &showprintlist); |
| 2926 | add_setshow_boolean_cmd ("symbol-filename", no_class, |
| 2927 | &print_symbol_filename, _("\ |
| 2928 | Set printing of source filename and line number with <SYMBOL>."), _("\ |
| 2929 | Show printing of source filename and line number with <SYMBOL>."), NULL, |
| 2930 | NULL, |
| 2931 | show_print_symbol_filename, |
| 2932 | &setprintlist, &showprintlist); |
| 2933 | |
| 2934 | add_com ("eval", no_class, eval_command, _("\ |
| 2935 | Construct a GDB command and then evaluate it.\n\ |
| 2936 | Usage: eval \"format string\", ARG1, ARG2, ARG3, ..., ARGN\n\ |
| 2937 | Convert the arguments to a string as \"printf\" would, but then\n\ |
| 2938 | treat this string as a command line, and evaluate it.")); |
| 2939 | } |