1 /* Support for printing Pascal values for GDB, the GNU debugger. 2 3 Copyright (C) 2000-2023 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 /* This file is derived from c-valprint.c */ 21 22 #include "defs.h" 23 #include "gdbsupport/gdb_obstack.h" 24 #include "symtab.h" 25 #include "gdbtypes.h" 26 #include "expression.h" 27 #include "value.h" 28 #include "command.h" 29 #include "gdbcmd.h" 30 #include "gdbcore.h" 31 #include "demangle.h" 32 #include "valprint.h" 33 #include "typeprint.h" 34 #include "language.h" 35 #include "target.h" 36 #include "annotate.h" 37 #include "p-lang.h" 38 #include "cp-abi.h" 39 #include "cp-support.h" 40 #include "objfiles.h" 41 #include "gdbsupport/byte-vector.h" 42 #include "cli/cli-style.h" 43 44 45 static void pascal_object_print_value_fields (struct value *, struct ui_file *, 46 int, 47 const struct value_print_options *, 48 struct type **, int); 49 50 /* Decorations for Pascal. */ 51 52 static const struct generic_val_print_decorations p_decorations = 53 { 54 "", 55 " + ", 56 " * I", 57 "true", 58 "false", 59 "void", 60 "{", 61 "}" 62 }; 63 64 /* See p-lang.h. */ 65 66 void 67 pascal_language::value_print_inner (struct value *val, 68 struct ui_file *stream, int recurse, 69 const struct value_print_options *options) const 70 71 { 72 struct type *type = check_typedef (value_type (val)); 73 struct gdbarch *gdbarch = type->arch (); 74 enum bfd_endian byte_order = type_byte_order (type); 75 unsigned int i = 0; /* Number of characters printed */ 76 unsigned len; 77 struct type *elttype; 78 unsigned eltlen; 79 int length_pos, length_size, string_pos; 80 struct type *char_type; 81 CORE_ADDR addr; 82 int want_space = 0; 83 const gdb_byte *valaddr = value_contents_for_printing (val).data (); 84 85 switch (type->code ()) 86 { 87 case TYPE_CODE_ARRAY: 88 { 89 LONGEST low_bound, high_bound; 90 91 if (get_array_bounds (type, &low_bound, &high_bound)) 92 { 93 len = high_bound - low_bound + 1; 94 elttype = check_typedef (type->target_type ()); 95 eltlen = elttype->length (); 96 /* If 's' format is used, try to print out as string. 97 If no format is given, print as string if element type 98 is of TYPE_CODE_CHAR and element size is 1,2 or 4. */ 99 if (options->format == 's' 100 || ((eltlen == 1 || eltlen == 2 || eltlen == 4) 101 && elttype->code () == TYPE_CODE_CHAR 102 && options->format == 0)) 103 { 104 /* If requested, look for the first null char and only print 105 elements up to it. */ 106 if (options->stop_print_at_null) 107 { 108 unsigned int temp_len; 109 110 /* Look for a NULL char. */ 111 for (temp_len = 0; 112 extract_unsigned_integer (valaddr + temp_len * eltlen, 113 eltlen, byte_order) 114 && temp_len < len && temp_len < options->print_max; 115 temp_len++); 116 len = temp_len; 117 } 118 119 printstr (stream, type->target_type (), valaddr, len, 120 NULL, 0, options); 121 i = len; 122 } 123 else 124 { 125 gdb_printf (stream, "{"); 126 /* If this is a virtual function table, print the 0th 127 entry specially, and the rest of the members normally. */ 128 if (pascal_object_is_vtbl_ptr_type (elttype)) 129 { 130 i = 1; 131 gdb_printf (stream, "%d vtable entries", len - 1); 132 } 133 else 134 { 135 i = 0; 136 } 137 value_print_array_elements (val, stream, recurse, options, i); 138 gdb_printf (stream, "}"); 139 } 140 break; 141 } 142 /* Array of unspecified length: treat like pointer to first elt. */ 143 addr = value_address (val); 144 } 145 goto print_unpacked_pointer; 146 147 case TYPE_CODE_PTR: 148 if (options->format && options->format != 's') 149 { 150 value_print_scalar_formatted (val, options, 0, stream); 151 break; 152 } 153 if (options->vtblprint && pascal_object_is_vtbl_ptr_type (type)) 154 { 155 /* Print the unmangled name if desired. */ 156 /* Print vtable entry - we only get here if we ARE using 157 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */ 158 /* Extract the address, assume that it is unsigned. */ 159 addr = extract_unsigned_integer (valaddr, 160 type->length (), byte_order); 161 print_address_demangle (options, gdbarch, addr, stream, demangle); 162 break; 163 } 164 check_typedef (type->target_type ()); 165 166 addr = unpack_pointer (type, valaddr); 167 print_unpacked_pointer: 168 elttype = check_typedef (type->target_type ()); 169 170 if (elttype->code () == TYPE_CODE_FUNC) 171 { 172 /* Try to print what function it points to. */ 173 print_address_demangle (options, gdbarch, addr, stream, demangle); 174 return; 175 } 176 177 if (options->addressprint && options->format != 's') 178 { 179 gdb_puts (paddress (gdbarch, addr), stream); 180 want_space = 1; 181 } 182 183 /* For a pointer to char or unsigned char, also print the string 184 pointed to, unless pointer is null. */ 185 if (((elttype->length () == 1 186 && (elttype->code () == TYPE_CODE_INT 187 || elttype->code () == TYPE_CODE_CHAR)) 188 || ((elttype->length () == 2 || elttype->length () == 4) 189 && elttype->code () == TYPE_CODE_CHAR)) 190 && (options->format == 0 || options->format == 's') 191 && addr != 0) 192 { 193 if (want_space) 194 gdb_puts (" ", stream); 195 /* No wide string yet. */ 196 i = val_print_string (elttype, NULL, addr, -1, stream, options); 197 } 198 /* Also for pointers to pascal strings. */ 199 /* Note: this is Free Pascal specific: 200 as GDB does not recognize stabs pascal strings 201 Pascal strings are mapped to records 202 with lowercase names PM. */ 203 if (pascal_is_string_type (elttype, &length_pos, &length_size, 204 &string_pos, &char_type, NULL) > 0 205 && addr != 0) 206 { 207 ULONGEST string_length; 208 gdb_byte *buffer; 209 210 if (want_space) 211 gdb_puts (" ", stream); 212 buffer = (gdb_byte *) xmalloc (length_size); 213 read_memory (addr + length_pos, buffer, length_size); 214 string_length = extract_unsigned_integer (buffer, length_size, 215 byte_order); 216 xfree (buffer); 217 i = val_print_string (char_type, NULL, 218 addr + string_pos, string_length, 219 stream, options); 220 } 221 else if (pascal_object_is_vtbl_member (type)) 222 { 223 /* Print vtbl's nicely. */ 224 CORE_ADDR vt_address = unpack_pointer (type, valaddr); 225 struct bound_minimal_symbol msymbol = 226 lookup_minimal_symbol_by_pc (vt_address); 227 228 /* If 'symbol_print' is set, we did the work above. */ 229 if (!options->symbol_print 230 && (msymbol.minsym != NULL) 231 && (vt_address == msymbol.value_address ())) 232 { 233 if (want_space) 234 gdb_puts (" ", stream); 235 gdb_puts ("<", stream); 236 gdb_puts (msymbol.minsym->print_name (), stream); 237 gdb_puts (">", stream); 238 want_space = 1; 239 } 240 if (vt_address && options->vtblprint) 241 { 242 struct value *vt_val; 243 struct symbol *wsym = NULL; 244 struct type *wtype; 245 246 if (want_space) 247 gdb_puts (" ", stream); 248 249 if (msymbol.minsym != NULL) 250 { 251 const char *search_name = msymbol.minsym->search_name (); 252 wsym = lookup_symbol_search_name (search_name, NULL, 253 VAR_DOMAIN).symbol; 254 } 255 256 if (wsym) 257 { 258 wtype = wsym->type (); 259 } 260 else 261 { 262 wtype = type->target_type (); 263 } 264 vt_val = value_at (wtype, vt_address); 265 common_val_print (vt_val, stream, recurse + 1, options, 266 current_language); 267 if (options->prettyformat) 268 { 269 gdb_printf (stream, "\n"); 270 print_spaces (2 + 2 * recurse, stream); 271 } 272 } 273 } 274 275 return; 276 277 case TYPE_CODE_REF: 278 case TYPE_CODE_ENUM: 279 case TYPE_CODE_FLAGS: 280 case TYPE_CODE_FUNC: 281 case TYPE_CODE_RANGE: 282 case TYPE_CODE_INT: 283 case TYPE_CODE_FLT: 284 case TYPE_CODE_VOID: 285 case TYPE_CODE_ERROR: 286 case TYPE_CODE_UNDEF: 287 case TYPE_CODE_BOOL: 288 case TYPE_CODE_CHAR: 289 generic_value_print (val, stream, recurse, options, &p_decorations); 290 break; 291 292 case TYPE_CODE_UNION: 293 if (recurse && !options->unionprint) 294 { 295 gdb_printf (stream, "{...}"); 296 break; 297 } 298 /* Fall through. */ 299 case TYPE_CODE_STRUCT: 300 if (options->vtblprint && pascal_object_is_vtbl_ptr_type (type)) 301 { 302 /* Print the unmangled name if desired. */ 303 /* Print vtable entry - we only get here if NOT using 304 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */ 305 /* Extract the address, assume that it is unsigned. */ 306 print_address_demangle 307 (options, gdbarch, 308 extract_unsigned_integer 309 (valaddr + type->field (VTBL_FNADDR_OFFSET).loc_bitpos () / 8, 310 type->field (VTBL_FNADDR_OFFSET).type ()->length (), 311 byte_order), 312 stream, demangle); 313 } 314 else 315 { 316 if (pascal_is_string_type (type, &length_pos, &length_size, 317 &string_pos, &char_type, NULL) > 0) 318 { 319 len = extract_unsigned_integer (valaddr + length_pos, 320 length_size, byte_order); 321 printstr (stream, char_type, valaddr + string_pos, len, 322 NULL, 0, options); 323 } 324 else 325 pascal_object_print_value_fields (val, stream, recurse, 326 options, NULL, 0); 327 } 328 break; 329 330 case TYPE_CODE_SET: 331 elttype = type->index_type (); 332 elttype = check_typedef (elttype); 333 if (elttype->is_stub ()) 334 { 335 fprintf_styled (stream, metadata_style.style (), "<incomplete type>"); 336 break; 337 } 338 else 339 { 340 struct type *range = elttype; 341 LONGEST low_bound, high_bound; 342 int need_comma = 0; 343 344 gdb_puts ("[", stream); 345 346 int bound_info = (get_discrete_bounds (range, &low_bound, &high_bound) 347 ? 0 : -1); 348 if (low_bound == 0 && high_bound == -1 && type->length () > 0) 349 { 350 /* If we know the size of the set type, we can figure out the 351 maximum value. */ 352 bound_info = 0; 353 high_bound = type->length () * TARGET_CHAR_BIT - 1; 354 range->bounds ()->high.set_const_val (high_bound); 355 } 356 maybe_bad_bstring: 357 if (bound_info < 0) 358 { 359 fputs_styled ("<error value>", metadata_style.style (), stream); 360 goto done; 361 } 362 363 for (i = low_bound; i <= high_bound; i++) 364 { 365 int element = value_bit_index (type, valaddr, i); 366 367 if (element < 0) 368 { 369 i = element; 370 goto maybe_bad_bstring; 371 } 372 if (element) 373 { 374 if (need_comma) 375 gdb_puts (", ", stream); 376 print_type_scalar (range, i, stream); 377 need_comma = 1; 378 379 if (i + 1 <= high_bound 380 && value_bit_index (type, valaddr, ++i)) 381 { 382 int j = i; 383 384 gdb_puts ("..", stream); 385 while (i + 1 <= high_bound 386 && value_bit_index (type, valaddr, ++i)) 387 j = i; 388 print_type_scalar (range, j, stream); 389 } 390 } 391 } 392 done: 393 gdb_puts ("]", stream); 394 } 395 break; 396 397 default: 398 error (_("Invalid pascal type code %d in symbol table."), 399 type->code ()); 400 } 401 } 402 403 404 void 405 pascal_language::value_print (struct value *val, struct ui_file *stream, 406 const struct value_print_options *options) const 407 { 408 struct type *type = value_type (val); 409 struct value_print_options opts = *options; 410 411 opts.deref_ref = 1; 412 413 /* If it is a pointer, indicate what it points to. 414 415 Print type also if it is a reference. 416 417 Object pascal: if it is a member pointer, we will take care 418 of that when we print it. */ 419 if (type->code () == TYPE_CODE_PTR 420 || type->code () == TYPE_CODE_REF) 421 { 422 /* Hack: remove (char *) for char strings. Their 423 type is indicated by the quoted string anyway. */ 424 if (type->code () == TYPE_CODE_PTR 425 && type->name () == NULL 426 && type->target_type ()->name () != NULL 427 && strcmp (type->target_type ()->name (), "char") == 0) 428 { 429 /* Print nothing. */ 430 } 431 else 432 { 433 gdb_printf (stream, "("); 434 type_print (type, "", stream, -1); 435 gdb_printf (stream, ") "); 436 } 437 } 438 common_val_print (val, stream, 0, &opts, current_language); 439 } 440 441 442 static void 443 show_pascal_static_field_print (struct ui_file *file, int from_tty, 444 struct cmd_list_element *c, const char *value) 445 { 446 gdb_printf (file, _("Printing of pascal static members is %s.\n"), 447 value); 448 } 449 450 static struct obstack dont_print_vb_obstack; 451 static struct obstack dont_print_statmem_obstack; 452 453 static void pascal_object_print_static_field (struct value *, 454 struct ui_file *, int, 455 const struct value_print_options *); 456 457 static void pascal_object_print_value (struct value *, struct ui_file *, int, 458 const struct value_print_options *, 459 struct type **); 460 461 /* It was changed to this after 2.4.5. */ 462 const char pascal_vtbl_ptr_name[] = 463 {'_', '_', 'v', 't', 'b', 'l', '_', 'p', 't', 'r', '_', 't', 'y', 'p', 'e', 0}; 464 465 /* Return truth value for assertion that TYPE is of the type 466 "pointer to virtual function". */ 467 468 int 469 pascal_object_is_vtbl_ptr_type (struct type *type) 470 { 471 const char *type_name = type->name (); 472 473 return (type_name != NULL 474 && strcmp (type_name, pascal_vtbl_ptr_name) == 0); 475 } 476 477 /* Return truth value for the assertion that TYPE is of the type 478 "pointer to virtual function table". */ 479 480 int 481 pascal_object_is_vtbl_member (struct type *type) 482 { 483 if (type->code () == TYPE_CODE_PTR) 484 { 485 type = type->target_type (); 486 if (type->code () == TYPE_CODE_ARRAY) 487 { 488 type = type->target_type (); 489 if (type->code () == TYPE_CODE_STRUCT /* If not using 490 thunks. */ 491 || type->code () == TYPE_CODE_PTR) /* If using thunks. */ 492 { 493 /* Virtual functions tables are full of pointers 494 to virtual functions. */ 495 return pascal_object_is_vtbl_ptr_type (type); 496 } 497 } 498 } 499 return 0; 500 } 501 502 /* Helper function for print pascal objects. 503 504 VAL, STREAM, RECURSE, and OPTIONS have the same meanings as in 505 pascal_object_print_value and c_value_print. 506 507 DONT_PRINT is an array of baseclass types that we 508 should not print, or zero if called from top level. */ 509 510 static void 511 pascal_object_print_value_fields (struct value *val, struct ui_file *stream, 512 int recurse, 513 const struct value_print_options *options, 514 struct type **dont_print_vb, 515 int dont_print_statmem) 516 { 517 int i, len, n_baseclasses; 518 char *last_dont_print 519 = (char *) obstack_next_free (&dont_print_statmem_obstack); 520 521 struct type *type = check_typedef (value_type (val)); 522 523 gdb_printf (stream, "{"); 524 len = type->num_fields (); 525 n_baseclasses = TYPE_N_BASECLASSES (type); 526 527 /* Print out baseclasses such that we don't print 528 duplicates of virtual baseclasses. */ 529 if (n_baseclasses > 0) 530 pascal_object_print_value (val, stream, recurse + 1, 531 options, dont_print_vb); 532 533 if (!len && n_baseclasses == 1) 534 fprintf_styled (stream, metadata_style.style (), "<No data fields>"); 535 else 536 { 537 struct obstack tmp_obstack = dont_print_statmem_obstack; 538 int fields_seen = 0; 539 const gdb_byte *valaddr = value_contents_for_printing (val).data (); 540 541 if (dont_print_statmem == 0) 542 { 543 /* If we're at top level, carve out a completely fresh 544 chunk of the obstack and use that until this particular 545 invocation returns. */ 546 obstack_finish (&dont_print_statmem_obstack); 547 } 548 549 for (i = n_baseclasses; i < len; i++) 550 { 551 /* If requested, skip printing of static fields. */ 552 if (!options->pascal_static_field_print 553 && field_is_static (&type->field (i))) 554 continue; 555 if (fields_seen) 556 gdb_printf (stream, ", "); 557 else if (n_baseclasses > 0) 558 { 559 if (options->prettyformat) 560 { 561 gdb_printf (stream, "\n"); 562 print_spaces (2 + 2 * recurse, stream); 563 gdb_puts ("members of ", stream); 564 gdb_puts (type->name (), stream); 565 gdb_puts (": ", stream); 566 } 567 } 568 fields_seen = 1; 569 570 if (options->prettyformat) 571 { 572 gdb_printf (stream, "\n"); 573 print_spaces (2 + 2 * recurse, stream); 574 } 575 else 576 { 577 stream->wrap_here (2 + 2 * recurse); 578 } 579 580 annotate_field_begin (type->field (i).type ()); 581 582 if (field_is_static (&type->field (i))) 583 { 584 gdb_puts ("static ", stream); 585 fprintf_symbol (stream, 586 type->field (i).name (), 587 current_language->la_language, 588 DMGL_PARAMS | DMGL_ANSI); 589 } 590 else 591 fputs_styled (type->field (i).name (), 592 variable_name_style.style (), stream); 593 annotate_field_name_end (); 594 gdb_puts (" = ", stream); 595 annotate_field_value (); 596 597 if (!field_is_static (&type->field (i)) 598 && TYPE_FIELD_PACKED (type, i)) 599 { 600 struct value *v; 601 602 /* Bitfields require special handling, especially due to byte 603 order problems. */ 604 if (TYPE_FIELD_IGNORE (type, i)) 605 { 606 fputs_styled ("<optimized out or zero length>", 607 metadata_style.style (), stream); 608 } 609 else if (value_bits_synthetic_pointer 610 (val, type->field (i).loc_bitpos (), 611 TYPE_FIELD_BITSIZE (type, i))) 612 { 613 fputs_styled (_("<synthetic pointer>"), 614 metadata_style.style (), stream); 615 } 616 else 617 { 618 struct value_print_options opts = *options; 619 620 v = value_field_bitfield (type, i, valaddr, 0, val); 621 622 opts.deref_ref = 0; 623 common_val_print (v, stream, recurse + 1, &opts, 624 current_language); 625 } 626 } 627 else 628 { 629 if (TYPE_FIELD_IGNORE (type, i)) 630 { 631 fputs_styled ("<optimized out or zero length>", 632 metadata_style.style (), stream); 633 } 634 else if (field_is_static (&type->field (i))) 635 { 636 /* struct value *v = value_static_field (type, i); 637 v4.17 specific. */ 638 struct value *v; 639 640 v = value_field_bitfield (type, i, valaddr, 0, val); 641 642 if (v == NULL) 643 val_print_optimized_out (NULL, stream); 644 else 645 pascal_object_print_static_field (v, stream, recurse + 1, 646 options); 647 } 648 else 649 { 650 struct value_print_options opts = *options; 651 652 opts.deref_ref = 0; 653 654 struct value *v = value_primitive_field (val, 0, i, 655 value_type (val)); 656 common_val_print (v, stream, recurse + 1, &opts, 657 current_language); 658 } 659 } 660 annotate_field_end (); 661 } 662 663 if (dont_print_statmem == 0) 664 { 665 /* Free the space used to deal with the printing 666 of the members from top level. */ 667 obstack_free (&dont_print_statmem_obstack, last_dont_print); 668 dont_print_statmem_obstack = tmp_obstack; 669 } 670 671 if (options->prettyformat) 672 { 673 gdb_printf (stream, "\n"); 674 print_spaces (2 * recurse, stream); 675 } 676 } 677 gdb_printf (stream, "}"); 678 } 679 680 /* Special val_print routine to avoid printing multiple copies of virtual 681 baseclasses. */ 682 683 static void 684 pascal_object_print_value (struct value *val, struct ui_file *stream, 685 int recurse, 686 const struct value_print_options *options, 687 struct type **dont_print_vb) 688 { 689 struct type **last_dont_print 690 = (struct type **) obstack_next_free (&dont_print_vb_obstack); 691 struct obstack tmp_obstack = dont_print_vb_obstack; 692 struct type *type = check_typedef (value_type (val)); 693 int i, n_baseclasses = TYPE_N_BASECLASSES (type); 694 695 if (dont_print_vb == 0) 696 { 697 /* If we're at top level, carve out a completely fresh 698 chunk of the obstack and use that until this particular 699 invocation returns. */ 700 /* Bump up the high-water mark. Now alpha is omega. */ 701 obstack_finish (&dont_print_vb_obstack); 702 } 703 704 for (i = 0; i < n_baseclasses; i++) 705 { 706 LONGEST boffset = 0; 707 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); 708 const char *basename = baseclass->name (); 709 int skip = 0; 710 711 if (BASETYPE_VIA_VIRTUAL (type, i)) 712 { 713 struct type **first_dont_print 714 = (struct type **) obstack_base (&dont_print_vb_obstack); 715 716 int j = (struct type **) obstack_next_free (&dont_print_vb_obstack) 717 - first_dont_print; 718 719 while (--j >= 0) 720 if (baseclass == first_dont_print[j]) 721 goto flush_it; 722 723 obstack_ptr_grow (&dont_print_vb_obstack, baseclass); 724 } 725 726 struct value *base_value; 727 try 728 { 729 base_value = value_primitive_field (val, 0, i, type); 730 } 731 catch (const gdb_exception_error &ex) 732 { 733 base_value = nullptr; 734 if (ex.error == NOT_AVAILABLE_ERROR) 735 skip = -1; 736 else 737 skip = 1; 738 } 739 740 if (skip == 0) 741 { 742 /* The virtual base class pointer might have been clobbered by the 743 user program. Make sure that it still points to a valid memory 744 location. */ 745 746 if (boffset < 0 || boffset >= type->length ()) 747 { 748 CORE_ADDR address= value_address (val); 749 gdb::byte_vector buf (baseclass->length ()); 750 751 if (target_read_memory (address + boffset, buf.data (), 752 baseclass->length ()) != 0) 753 skip = 1; 754 base_value = value_from_contents_and_address (baseclass, 755 buf.data (), 756 address + boffset); 757 baseclass = value_type (base_value); 758 boffset = 0; 759 } 760 } 761 762 if (options->prettyformat) 763 { 764 gdb_printf (stream, "\n"); 765 print_spaces (2 * recurse, stream); 766 } 767 gdb_puts ("<", stream); 768 /* Not sure what the best notation is in the case where there is no 769 baseclass name. */ 770 771 gdb_puts (basename ? basename : "", stream); 772 gdb_puts ("> = ", stream); 773 774 if (skip < 0) 775 val_print_unavailable (stream); 776 else if (skip > 0) 777 val_print_invalid_address (stream); 778 else 779 pascal_object_print_value_fields 780 (base_value, stream, recurse, options, 781 (struct type **) obstack_base (&dont_print_vb_obstack), 782 0); 783 gdb_puts (", ", stream); 784 785 flush_it: 786 ; 787 } 788 789 if (dont_print_vb == 0) 790 { 791 /* Free the space used to deal with the printing 792 of this type from top level. */ 793 obstack_free (&dont_print_vb_obstack, last_dont_print); 794 /* Reset watermark so that we can continue protecting 795 ourselves from whatever we were protecting ourselves. */ 796 dont_print_vb_obstack = tmp_obstack; 797 } 798 } 799 800 /* Print value of a static member. 801 To avoid infinite recursion when printing a class that contains 802 a static instance of the class, we keep the addresses of all printed 803 static member classes in an obstack and refuse to print them more 804 than once. 805 806 VAL contains the value to print, STREAM, RECURSE, and OPTIONS 807 have the same meanings as in c_val_print. */ 808 809 static void 810 pascal_object_print_static_field (struct value *val, 811 struct ui_file *stream, 812 int recurse, 813 const struct value_print_options *options) 814 { 815 struct type *type = value_type (val); 816 struct value_print_options opts; 817 818 if (value_entirely_optimized_out (val)) 819 { 820 val_print_optimized_out (val, stream); 821 return; 822 } 823 824 if (type->code () == TYPE_CODE_STRUCT) 825 { 826 CORE_ADDR *first_dont_print, addr; 827 int i; 828 829 first_dont_print 830 = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack); 831 i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack) 832 - first_dont_print; 833 834 while (--i >= 0) 835 { 836 if (value_address (val) == first_dont_print[i]) 837 { 838 fputs_styled (_("\ 839 <same as static member of an already seen type>"), 840 metadata_style.style (), stream); 841 return; 842 } 843 } 844 845 addr = value_address (val); 846 obstack_grow (&dont_print_statmem_obstack, (char *) &addr, 847 sizeof (CORE_ADDR)); 848 849 type = check_typedef (type); 850 pascal_object_print_value_fields (val, stream, recurse, 851 options, NULL, 1); 852 return; 853 } 854 855 opts = *options; 856 opts.deref_ref = 0; 857 common_val_print (val, stream, recurse, &opts, current_language); 858 } 859 860 void _initialize_pascal_valprint (); 861 void 862 _initialize_pascal_valprint () 863 { 864 add_setshow_boolean_cmd ("pascal_static-members", class_support, 865 &user_print_options.pascal_static_field_print, _("\ 866 Set printing of pascal static members."), _("\ 867 Show printing of pascal static members."), NULL, 868 NULL, 869 show_pascal_static_field_print, 870 &setprintlist, &showprintlist); 871 } 872