1/* Support for printing C values for GDB, the GNU debugger. 2 3 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 4 1997, 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23#include "defs.h" 24#include "gdb_string.h" 25#include "symtab.h" 26#include "gdbtypes.h" 27#include "expression.h" 28#include "value.h" 29#include "valprint.h" 30#include "language.h" 31#include "c-lang.h" 32#include "cp-abi.h" 33#include "target.h" 34 35 36/* Print function pointer with inferior address ADDRESS onto stdio 37 stream STREAM. */ 38 39static void 40print_function_pointer_address (CORE_ADDR address, struct ui_file *stream) 41{ 42 CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, 43 address, 44 ¤t_target); 45 46 /* If the function pointer is represented by a description, print the 47 address of the description. */ 48 if (addressprint && func_addr != address) 49 { 50 fputs_filtered ("@", stream); 51 print_address_numeric (address, 1, stream); 52 fputs_filtered (": ", stream); 53 } 54 print_address_demangle (func_addr, stream, demangle); 55} 56 57 58/* Print data of type TYPE located at VALADDR (within GDB), which came from 59 the inferior at address ADDRESS, onto stdio stream STREAM according to 60 FORMAT (a letter or 0 for natural format). The data at VALADDR is in 61 target byte order. 62 63 If the data are a string pointer, returns the number of string characters 64 printed. 65 66 If DEREF_REF is nonzero, then dereference references, otherwise just print 67 them like pointers. 68 69 The PRETTY parameter controls prettyprinting. */ 70 71int 72c_val_print (struct type *type, char *valaddr, int embedded_offset, 73 CORE_ADDR address, struct ui_file *stream, int format, 74 int deref_ref, int recurse, enum val_prettyprint pretty) 75{ 76 unsigned int i = 0; /* Number of characters printed */ 77 unsigned len; 78 struct type *elttype; 79 unsigned eltlen; 80 LONGEST val; 81 CORE_ADDR addr; 82 83 CHECK_TYPEDEF (type); 84 switch (TYPE_CODE (type)) 85 { 86 case TYPE_CODE_ARRAY: 87 elttype = check_typedef (TYPE_TARGET_TYPE (type)); 88 if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0) 89 { 90 eltlen = TYPE_LENGTH (elttype); 91 len = TYPE_LENGTH (type) / eltlen; 92 if (prettyprint_arrays) 93 { 94 print_spaces_filtered (2 + 2 * recurse, stream); 95 } 96 /* For an array of chars, print with string syntax. */ 97 if (eltlen == 1 && 98 ((TYPE_CODE (elttype) == TYPE_CODE_INT) 99 || ((current_language->la_language == language_m2) 100 && (TYPE_CODE (elttype) == TYPE_CODE_CHAR))) 101 && (format == 0 || format == 's')) 102 { 103 /* If requested, look for the first null char and only print 104 elements up to it. */ 105 if (stop_print_at_null) 106 { 107 unsigned int temp_len; 108 109 /* Look for a NULL char. */ 110 for (temp_len = 0; 111 (valaddr + embedded_offset)[temp_len] 112 && temp_len < len && temp_len < print_max; 113 temp_len++); 114 len = temp_len; 115 } 116 117 LA_PRINT_STRING (stream, valaddr + embedded_offset, len, eltlen, 0); 118 i = len; 119 } 120 else 121 { 122 fprintf_filtered (stream, "{"); 123 /* If this is a virtual function table, print the 0th 124 entry specially, and the rest of the members normally. */ 125 if (cp_is_vtbl_ptr_type (elttype)) 126 { 127 i = 1; 128 fprintf_filtered (stream, "%d vtable entries", len - 1); 129 } 130 else 131 { 132 i = 0; 133 } 134 val_print_array_elements (type, valaddr + embedded_offset, address, stream, 135 format, deref_ref, recurse, pretty, i); 136 fprintf_filtered (stream, "}"); 137 } 138 break; 139 } 140 /* Array of unspecified length: treat like pointer to first elt. */ 141 addr = address; 142 goto print_unpacked_pointer; 143 144 case TYPE_CODE_PTR: 145 if (format && format != 's') 146 { 147 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 148 break; 149 } 150 if (vtblprint && cp_is_vtbl_ptr_type (type)) 151 { 152 /* Print the unmangled name if desired. */ 153 /* Print vtable entry - we only get here if we ARE using 154 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */ 155 CORE_ADDR addr 156 = extract_typed_address (valaddr + embedded_offset, type); 157 print_function_pointer_address (addr, stream); 158 break; 159 } 160 elttype = check_typedef (TYPE_TARGET_TYPE (type)); 161 if (TYPE_CODE (elttype) == TYPE_CODE_METHOD) 162 { 163 cp_print_class_method (valaddr + embedded_offset, type, stream); 164 } 165 else if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER) 166 { 167 cp_print_class_member (valaddr + embedded_offset, 168 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)), 169 stream, "&"); 170 } 171 else 172 { 173 addr = unpack_pointer (type, valaddr + embedded_offset); 174 print_unpacked_pointer: 175 176 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC) 177 { 178 /* Try to print what function it points to. */ 179 print_function_pointer_address (addr, stream); 180 /* Return value is irrelevant except for string pointers. */ 181 return (0); 182 } 183 184 if (addressprint && format != 's') 185 { 186 print_address_numeric (addr, 1, stream); 187 } 188 189 /* For a pointer to char or unsigned char, also print the string 190 pointed to, unless pointer is null. */ 191 /* FIXME: need to handle wchar_t here... */ 192 193 if (TYPE_LENGTH (elttype) == 1 194 && TYPE_CODE (elttype) == TYPE_CODE_INT 195 && (format == 0 || format == 's') 196 && addr != 0) 197 { 198 i = val_print_string (addr, -1, TYPE_LENGTH (elttype), stream); 199 } 200 else if (cp_is_vtbl_member (type)) 201 { 202 /* print vtbl's nicely */ 203 CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset); 204 205 struct minimal_symbol *msymbol = 206 lookup_minimal_symbol_by_pc (vt_address); 207 if ((msymbol != NULL) && 208 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol))) 209 { 210 fputs_filtered (" <", stream); 211 fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream); 212 fputs_filtered (">", stream); 213 } 214 if (vt_address && vtblprint) 215 { 216 struct value *vt_val; 217 struct symbol *wsym = (struct symbol *) NULL; 218 struct type *wtype; 219 struct block *block = (struct block *) NULL; 220 int is_this_fld; 221 222 if (msymbol != NULL) 223 wsym = lookup_symbol (DEPRECATED_SYMBOL_NAME (msymbol), block, 224 VAR_DOMAIN, &is_this_fld, NULL); 225 226 if (wsym) 227 { 228 wtype = SYMBOL_TYPE (wsym); 229 } 230 else 231 { 232 wtype = TYPE_TARGET_TYPE (type); 233 } 234 vt_val = value_at (wtype, vt_address, NULL); 235 common_val_print (vt_val, stream, format, 236 deref_ref, recurse + 1, pretty); 237 if (pretty) 238 { 239 fprintf_filtered (stream, "\n"); 240 print_spaces_filtered (2 + 2 * recurse, stream); 241 } 242 } 243 } 244 245 /* Return number of characters printed, including the terminating 246 '\0' if we reached the end. val_print_string takes care including 247 the terminating '\0' if necessary. */ 248 return i; 249 } 250 break; 251 252 case TYPE_CODE_MEMBER: 253 error ("not implemented: member type in c_val_print"); 254 break; 255 256 case TYPE_CODE_REF: 257 elttype = check_typedef (TYPE_TARGET_TYPE (type)); 258 if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER) 259 { 260 cp_print_class_member (valaddr + embedded_offset, 261 TYPE_DOMAIN_TYPE (elttype), 262 stream, ""); 263 break; 264 } 265 if (addressprint) 266 { 267 CORE_ADDR addr 268 = extract_typed_address (valaddr + embedded_offset, type); 269 fprintf_filtered (stream, "@"); 270 print_address_numeric (addr, 1, stream); 271 if (deref_ref) 272 fputs_filtered (": ", stream); 273 } 274 /* De-reference the reference. */ 275 if (deref_ref) 276 { 277 if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF) 278 { 279 struct value *deref_val = 280 value_at 281 (TYPE_TARGET_TYPE (type), 282 unpack_pointer (lookup_pointer_type (builtin_type_void), 283 valaddr + embedded_offset), 284 NULL); 285 common_val_print (deref_val, stream, format, deref_ref, 286 recurse, pretty); 287 } 288 else 289 fputs_filtered ("???", stream); 290 } 291 break; 292 293 case TYPE_CODE_UNION: 294 if (recurse && !unionprint) 295 { 296 fprintf_filtered (stream, "{...}"); 297 break; 298 } 299 /* Fall through. */ 300 case TYPE_CODE_STRUCT: 301 /*FIXME: Abstract this away */ 302 if (vtblprint && cp_is_vtbl_ptr_type (type)) 303 { 304 /* Print the unmangled name if desired. */ 305 /* Print vtable entry - we only get here if NOT using 306 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */ 307 int offset = (embedded_offset + 308 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8); 309 struct type *field_type = TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET); 310 CORE_ADDR addr 311 = extract_typed_address (valaddr + offset, field_type); 312 313 print_function_pointer_address (addr, stream); 314 } 315 else 316 cp_print_value_fields (type, type, valaddr, embedded_offset, address, stream, format, 317 recurse, pretty, NULL, 0); 318 break; 319 320 case TYPE_CODE_ENUM: 321 if (format) 322 { 323 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 324 break; 325 } 326 len = TYPE_NFIELDS (type); 327 val = unpack_long (type, valaddr + embedded_offset); 328 for (i = 0; i < len; i++) 329 { 330 QUIT; 331 if (val == TYPE_FIELD_BITPOS (type, i)) 332 { 333 break; 334 } 335 } 336 if (i < len) 337 { 338 fputs_filtered (TYPE_FIELD_NAME (type, i), stream); 339 } 340 else 341 { 342 print_longest (stream, 'd', 0, val); 343 } 344 break; 345 346 case TYPE_CODE_FUNC: 347 if (format) 348 { 349 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 350 break; 351 } 352 /* FIXME, we should consider, at least for ANSI C language, eliminating 353 the distinction made between FUNCs and POINTERs to FUNCs. */ 354 fprintf_filtered (stream, "{"); 355 type_print (type, "", stream, -1); 356 fprintf_filtered (stream, "} "); 357 /* Try to print what function it points to, and its address. */ 358 print_address_demangle (address, stream, demangle); 359 break; 360 361 case TYPE_CODE_BOOL: 362 format = format ? format : output_format; 363 if (format) 364 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 365 else 366 { 367 val = unpack_long (type, valaddr + embedded_offset); 368 if (val == 0) 369 fputs_filtered ("false", stream); 370 else if (val == 1) 371 fputs_filtered ("true", stream); 372 else 373 print_longest (stream, 'd', 0, val); 374 } 375 break; 376 377 case TYPE_CODE_RANGE: 378 /* FIXME: create_range_type does not set the unsigned bit in a 379 range type (I think it probably should copy it from the target 380 type), so we won't print values which are too large to 381 fit in a signed integer correctly. */ 382 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just 383 print with the target type, though, because the size of our type 384 and the target type might differ). */ 385 /* FALLTHROUGH */ 386 387 case TYPE_CODE_INT: 388 format = format ? format : output_format; 389 if (format) 390 { 391 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 392 } 393 else 394 { 395 val_print_type_code_int (type, valaddr + embedded_offset, stream); 396 /* C and C++ has no single byte int type, char is used instead. 397 Since we don't know whether the value is really intended to 398 be used as an integer or a character, print the character 399 equivalent as well. */ 400 if (TYPE_LENGTH (type) == 1) 401 { 402 fputs_filtered (" ", stream); 403 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr + embedded_offset), 404 stream); 405 } 406 } 407 break; 408 409 case TYPE_CODE_CHAR: 410 format = format ? format : output_format; 411 if (format) 412 { 413 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 414 } 415 else 416 { 417 val = unpack_long (type, valaddr + embedded_offset); 418 if (TYPE_UNSIGNED (type)) 419 fprintf_filtered (stream, "%u", (unsigned int) val); 420 else 421 fprintf_filtered (stream, "%d", (int) val); 422 fputs_filtered (" ", stream); 423 LA_PRINT_CHAR ((unsigned char) val, stream); 424 } 425 break; 426 427 case TYPE_CODE_FLT: 428 if (format) 429 { 430 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); 431 } 432 else 433 { 434 print_floating (valaddr + embedded_offset, type, stream); 435 } 436 break; 437 438 case TYPE_CODE_METHOD: 439 { 440 struct value *v = value_at (type, address, NULL); 441 cp_print_class_method (VALUE_CONTENTS (value_addr (v)), 442 lookup_pointer_type (type), stream); 443 break; 444 } 445 446 case TYPE_CODE_VOID: 447 fprintf_filtered (stream, "void"); 448 break; 449 450 case TYPE_CODE_ERROR: 451 fprintf_filtered (stream, "<error type>"); 452 break; 453 454 case TYPE_CODE_UNDEF: 455 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use 456 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar" 457 and no complete type for struct foo in that file. */ 458 fprintf_filtered (stream, "<incomplete type>"); 459 break; 460 461 case TYPE_CODE_COMPLEX: 462 if (format) 463 print_scalar_formatted (valaddr + embedded_offset, 464 TYPE_TARGET_TYPE (type), 465 format, 0, stream); 466 else 467 print_floating (valaddr + embedded_offset, TYPE_TARGET_TYPE (type), 468 stream); 469 fprintf_filtered (stream, " + "); 470 if (format) 471 print_scalar_formatted (valaddr + embedded_offset 472 + TYPE_LENGTH (TYPE_TARGET_TYPE (type)), 473 TYPE_TARGET_TYPE (type), 474 format, 0, stream); 475 else 476 print_floating (valaddr + embedded_offset 477 + TYPE_LENGTH (TYPE_TARGET_TYPE (type)), 478 TYPE_TARGET_TYPE (type), 479 stream); 480 fprintf_filtered (stream, " * I"); 481 break; 482 483 default: 484 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type)); 485 } 486 gdb_flush (stream); 487 return (0); 488} 489 490int 491c_value_print (struct value *val, struct ui_file *stream, int format, 492 enum val_prettyprint pretty) 493{ 494 struct type *type = VALUE_TYPE (val); 495 struct type *real_type; 496 int full, top, using_enc; 497 498 /* If it is a pointer, indicate what it points to. 499 500 Print type also if it is a reference. 501 502 C++: if it is a member pointer, we will take care 503 of that when we print it. */ 504 if (TYPE_CODE (type) == TYPE_CODE_PTR || 505 TYPE_CODE (type) == TYPE_CODE_REF) 506 { 507 /* Hack: remove (char *) for char strings. Their 508 type is indicated by the quoted string anyway. */ 509 if (TYPE_CODE (type) == TYPE_CODE_PTR && 510 TYPE_NAME (type) == NULL && 511 TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL && 512 strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char") == 0) 513 { 514 /* Print nothing */ 515 } 516 else if (objectprint && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) 517 { 518 519 if (TYPE_CODE(type) == TYPE_CODE_REF) 520 { 521 /* Copy value, change to pointer, so we don't get an 522 * error about a non-pointer type in value_rtti_target_type 523 */ 524 struct value *temparg; 525 temparg=value_copy(val); 526 VALUE_TYPE (temparg) = lookup_pointer_type(TYPE_TARGET_TYPE(type)); 527 val=temparg; 528 } 529 /* Pointer to class, check real type of object */ 530 fprintf_filtered (stream, "("); 531 real_type = value_rtti_target_type (val, &full, &top, &using_enc); 532 if (real_type) 533 { 534 /* RTTI entry found */ 535 if (TYPE_CODE (type) == TYPE_CODE_PTR) 536 { 537 /* create a pointer type pointing to the real type */ 538 type = lookup_pointer_type (real_type); 539 } 540 else 541 { 542 /* create a reference type referencing the real type */ 543 type = lookup_reference_type (real_type); 544 } 545 /* JYG: Need to adjust pointer value. */ 546 val->aligner.contents[0] -= top; 547 548 /* Note: When we look up RTTI entries, we don't get any 549 information on const or volatile attributes */ 550 } 551 type_print (type, "", stream, -1); 552 fprintf_filtered (stream, ") "); 553 } 554 else 555 { 556 /* normal case */ 557 fprintf_filtered (stream, "("); 558 type_print (type, "", stream, -1); 559 fprintf_filtered (stream, ") "); 560 } 561 } 562 if (objectprint && (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_CLASS)) 563 { 564 /* Attempt to determine real type of object */ 565 real_type = value_rtti_type (val, &full, &top, &using_enc); 566 if (real_type) 567 { 568 /* We have RTTI information, so use it */ 569 val = value_full_object (val, real_type, full, top, using_enc); 570 fprintf_filtered (stream, "(%s%s) ", 571 TYPE_NAME (real_type), 572 full ? "" : " [incomplete object]"); 573 /* Print out object: enclosing type is same as real_type if full */ 574 return val_print (VALUE_ENCLOSING_TYPE (val), VALUE_CONTENTS_ALL (val), 0, 575 VALUE_ADDRESS (val), stream, format, 1, 0, pretty); 576 /* Note: When we look up RTTI entries, we don't get any information on 577 const or volatile attributes */ 578 } 579 else if (type != VALUE_ENCLOSING_TYPE (val)) 580 { 581 /* No RTTI information, so let's do our best */ 582 fprintf_filtered (stream, "(%s ?) ", 583 TYPE_NAME (VALUE_ENCLOSING_TYPE (val))); 584 return val_print (VALUE_ENCLOSING_TYPE (val), VALUE_CONTENTS_ALL (val), 0, 585 VALUE_ADDRESS (val), stream, format, 1, 0, pretty); 586 } 587 /* Otherwise, we end up at the return outside this "if" */ 588 } 589 590 return val_print (type, VALUE_CONTENTS_ALL (val), 591 VALUE_EMBEDDED_OFFSET (val), 592 VALUE_ADDRESS (val) + VALUE_OFFSET (val), 593 stream, format, 1, 0, pretty); 594} 595