1 /* Support for printing Java values for GDB, the GNU debugger. 2 3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 4 2008, 2009, 2010, 2011 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 3 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, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "symtab.h" 23 #include "gdbtypes.h" 24 #include "gdbcore.h" 25 #include "expression.h" 26 #include "value.h" 27 #include "demangle.h" 28 #include "valprint.h" 29 #include "language.h" 30 #include "jv-lang.h" 31 #include "c-lang.h" 32 #include "annotate.h" 33 #include "gdb_string.h" 34 35 /* Local functions */ 36 37 int 38 java_value_print (struct value *val, struct ui_file *stream, 39 const struct value_print_options *options) 40 { 41 struct gdbarch *gdbarch = get_type_arch (value_type (val)); 42 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 43 struct type *type; 44 CORE_ADDR address; 45 int i; 46 char *name; 47 struct value_print_options opts; 48 49 type = value_type (val); 50 address = value_address (val); 51 52 if (is_object_type (type)) 53 { 54 CORE_ADDR obj_addr; 55 56 /* Get the run-time type, and cast the object into that. */ 57 58 obj_addr = unpack_pointer (type, value_contents (val)); 59 60 if (obj_addr != 0) 61 { 62 type = type_from_class (gdbarch, java_class_from_object (val)); 63 type = lookup_pointer_type (type); 64 65 val = value_at (type, address); 66 } 67 } 68 69 if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val)) 70 type_print (TYPE_TARGET_TYPE (type), "", stream, -1); 71 72 name = TYPE_TAG_NAME (type); 73 if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL 74 && (i = strlen (name), name[i - 1] == ']')) 75 { 76 gdb_byte buf4[4]; 77 long length; 78 unsigned int things_printed = 0; 79 int reps; 80 struct type *el_type 81 = java_primitive_type_from_name (gdbarch, name, i - 2); 82 83 i = 0; 84 read_memory (address + get_java_object_header_size (gdbarch), buf4, 4); 85 86 length = (long) extract_signed_integer (buf4, 4, byte_order); 87 fprintf_filtered (stream, "{length: %ld", length); 88 89 if (el_type == NULL) 90 { 91 CORE_ADDR element; 92 CORE_ADDR next_element = -1; /* Dummy initial value. */ 93 94 /* Skip object header and length. */ 95 address += get_java_object_header_size (gdbarch) + 4; 96 97 while (i < length && things_printed < options->print_max) 98 { 99 gdb_byte *buf; 100 101 buf = alloca (gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT); 102 fputs_filtered (", ", stream); 103 wrap_here (n_spaces (2)); 104 105 if (i > 0) 106 element = next_element; 107 else 108 { 109 read_memory (address, buf, sizeof (buf)); 110 address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT; 111 /* FIXME: cagney/2003-05-24: Bogus or what. It 112 pulls a host sized pointer out of the target and 113 then extracts that as an address (while assuming 114 that the address is unsigned)! */ 115 element = extract_unsigned_integer (buf, sizeof (buf), 116 byte_order); 117 } 118 119 for (reps = 1; i + reps < length; reps++) 120 { 121 read_memory (address, buf, sizeof (buf)); 122 address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT; 123 /* FIXME: cagney/2003-05-24: Bogus or what. It 124 pulls a host sized pointer out of the target and 125 then extracts that as an address (while assuming 126 that the address is unsigned)! */ 127 next_element = extract_unsigned_integer (buf, sizeof (buf), 128 byte_order); 129 if (next_element != element) 130 break; 131 } 132 133 if (reps == 1) 134 fprintf_filtered (stream, "%d: ", i); 135 else 136 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1); 137 138 if (element == 0) 139 fprintf_filtered (stream, "null"); 140 else 141 fprintf_filtered (stream, "@%s", paddress (gdbarch, element)); 142 143 things_printed++; 144 i += reps; 145 } 146 } 147 else 148 { 149 struct value *v = allocate_value (el_type); 150 struct value *next_v = allocate_value (el_type); 151 152 set_value_address (v, (address 153 + get_java_object_header_size (gdbarch) + 4)); 154 set_value_address (next_v, value_raw_address (v)); 155 156 while (i < length && things_printed < options->print_max) 157 { 158 fputs_filtered (", ", stream); 159 wrap_here (n_spaces (2)); 160 161 if (i > 0) 162 { 163 struct value *tmp; 164 165 tmp = next_v; 166 next_v = v; 167 v = tmp; 168 } 169 else 170 { 171 set_value_lazy (v, 1); 172 set_value_offset (v, 0); 173 } 174 175 set_value_offset (next_v, value_offset (v)); 176 177 for (reps = 1; i + reps < length; reps++) 178 { 179 set_value_lazy (next_v, 1); 180 set_value_offset (next_v, value_offset (next_v) 181 + TYPE_LENGTH (el_type)); 182 value_fetch_lazy (next_v); 183 if (!(value_available_contents_eq 184 (v, value_embedded_offset (v), 185 next_v, value_embedded_offset (next_v), 186 TYPE_LENGTH (el_type)))) 187 break; 188 } 189 190 if (reps == 1) 191 fprintf_filtered (stream, "%d: ", i); 192 else 193 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1); 194 195 opts = *options; 196 opts.deref_ref = 1; 197 common_val_print (v, stream, 1, &opts, current_language); 198 199 things_printed++; 200 i += reps; 201 } 202 } 203 204 if (i < length) 205 fprintf_filtered (stream, "..."); 206 207 fprintf_filtered (stream, "}"); 208 209 return 0; 210 } 211 212 /* If it's type String, print it. */ 213 214 if (TYPE_CODE (type) == TYPE_CODE_PTR 215 && TYPE_TARGET_TYPE (type) 216 && TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)) 217 && strcmp (TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)), 218 "java.lang.String") == 0 219 && (options->format == 0 || options->format == 's') 220 && address != 0 221 && value_as_address (val) != 0) 222 { 223 struct type *char_type; 224 struct value *data_val; 225 CORE_ADDR data; 226 struct value *boffset_val; 227 unsigned long boffset; 228 struct value *count_val; 229 unsigned long count; 230 struct value *mark; 231 232 mark = value_mark (); /* Remember start of new values. */ 233 234 data_val = value_struct_elt (&val, NULL, "data", NULL, NULL); 235 data = value_as_address (data_val); 236 237 boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL); 238 boffset = value_as_address (boffset_val); 239 240 count_val = value_struct_elt (&val, NULL, "count", NULL, NULL); 241 count = value_as_address (count_val); 242 243 value_free_to_mark (mark); /* Release unnecessary values. */ 244 245 char_type = builtin_java_type (gdbarch)->builtin_char; 246 val_print_string (char_type, NULL, data + boffset, count, stream, 247 options); 248 249 return 0; 250 } 251 252 opts = *options; 253 opts.deref_ref = 1; 254 return common_val_print (val, stream, 0, &opts, current_language); 255 } 256 257 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the 258 same meanings as in cp_print_value and c_val_print. 259 260 DONT_PRINT is an array of baseclass types that we 261 should not print, or zero if called from top level. */ 262 263 static void 264 java_print_value_fields (struct type *type, const gdb_byte *valaddr, 265 int offset, 266 CORE_ADDR address, struct ui_file *stream, 267 int recurse, 268 const struct value *val, 269 const struct value_print_options *options) 270 { 271 int i, len, n_baseclasses; 272 273 CHECK_TYPEDEF (type); 274 275 fprintf_filtered (stream, "{"); 276 len = TYPE_NFIELDS (type); 277 n_baseclasses = TYPE_N_BASECLASSES (type); 278 279 if (n_baseclasses > 0) 280 { 281 int i, n_baseclasses = TYPE_N_BASECLASSES (type); 282 283 for (i = 0; i < n_baseclasses; i++) 284 { 285 int boffset; 286 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); 287 char *basename = TYPE_NAME (baseclass); 288 const gdb_byte *base_valaddr; 289 290 if (BASETYPE_VIA_VIRTUAL (type, i)) 291 continue; 292 293 if (basename != NULL && strcmp (basename, "java.lang.Object") == 0) 294 continue; 295 296 boffset = 0; 297 298 if (options->pretty) 299 { 300 fprintf_filtered (stream, "\n"); 301 print_spaces_filtered (2 * (recurse + 1), stream); 302 } 303 fputs_filtered ("<", stream); 304 /* Not sure what the best notation is in the case where there is no 305 baseclass name. */ 306 fputs_filtered (basename ? basename : "", stream); 307 fputs_filtered ("> = ", stream); 308 309 base_valaddr = valaddr; 310 311 java_print_value_fields (baseclass, base_valaddr, 312 offset + boffset, address, 313 stream, recurse + 1, val, options); 314 fputs_filtered (", ", stream); 315 } 316 } 317 318 if (!len && n_baseclasses == 1) 319 fprintf_filtered (stream, "<No data fields>"); 320 else 321 { 322 int fields_seen = 0; 323 324 for (i = n_baseclasses; i < len; i++) 325 { 326 /* If requested, skip printing of static fields. */ 327 if (field_is_static (&TYPE_FIELD (type, i))) 328 { 329 char *name = TYPE_FIELD_NAME (type, i); 330 331 if (!options->static_field_print) 332 continue; 333 if (name != NULL && strcmp (name, "class") == 0) 334 continue; 335 } 336 if (fields_seen) 337 fprintf_filtered (stream, ", "); 338 else if (n_baseclasses > 0) 339 { 340 if (options->pretty) 341 { 342 fprintf_filtered (stream, "\n"); 343 print_spaces_filtered (2 + 2 * recurse, stream); 344 fputs_filtered ("members of ", stream); 345 fputs_filtered (type_name_no_tag (type), stream); 346 fputs_filtered (": ", stream); 347 } 348 } 349 fields_seen = 1; 350 351 if (options->pretty) 352 { 353 fprintf_filtered (stream, "\n"); 354 print_spaces_filtered (2 + 2 * recurse, stream); 355 } 356 else 357 { 358 wrap_here (n_spaces (2 + 2 * recurse)); 359 } 360 if (options->inspect_it) 361 { 362 if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR) 363 fputs_filtered ("\"( ptr \"", stream); 364 else 365 fputs_filtered ("\"( nodef \"", stream); 366 if (field_is_static (&TYPE_FIELD (type, i))) 367 fputs_filtered ("static ", stream); 368 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), 369 language_cplus, 370 DMGL_PARAMS | DMGL_ANSI); 371 fputs_filtered ("\" \"", stream); 372 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), 373 language_cplus, 374 DMGL_PARAMS | DMGL_ANSI); 375 fputs_filtered ("\") \"", stream); 376 } 377 else 378 { 379 annotate_field_begin (TYPE_FIELD_TYPE (type, i)); 380 381 if (field_is_static (&TYPE_FIELD (type, i))) 382 fputs_filtered ("static ", stream); 383 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), 384 language_cplus, 385 DMGL_PARAMS | DMGL_ANSI); 386 annotate_field_name_end (); 387 fputs_filtered (": ", stream); 388 annotate_field_value (); 389 } 390 391 if (!field_is_static (&TYPE_FIELD (type, i)) 392 && TYPE_FIELD_PACKED (type, i)) 393 { 394 struct value *v; 395 396 /* Bitfields require special handling, especially due to byte 397 order problems. */ 398 if (TYPE_FIELD_IGNORE (type, i)) 399 { 400 fputs_filtered ("<optimized out or zero length>", stream); 401 } 402 else if (value_bits_synthetic_pointer (val, 403 TYPE_FIELD_BITPOS (type, 404 i), 405 TYPE_FIELD_BITSIZE (type, 406 i))) 407 { 408 fputs_filtered (_("<synthetic pointer>"), stream); 409 } 410 else if (!value_bits_valid (val, TYPE_FIELD_BITPOS (type, i), 411 TYPE_FIELD_BITSIZE (type, i))) 412 { 413 val_print_optimized_out (stream); 414 } 415 else 416 { 417 struct value_print_options opts; 418 419 v = value_field_bitfield (type, i, valaddr, offset, val); 420 421 opts = *options; 422 opts.deref_ref = 0; 423 common_val_print (v, stream, recurse + 1, 424 &opts, current_language); 425 } 426 } 427 else 428 { 429 if (TYPE_FIELD_IGNORE (type, i)) 430 { 431 fputs_filtered ("<optimized out or zero length>", stream); 432 } 433 else if (field_is_static (&TYPE_FIELD (type, i))) 434 { 435 struct value *v = value_static_field (type, i); 436 437 if (v == NULL) 438 val_print_optimized_out (stream); 439 else 440 { 441 struct value_print_options opts; 442 struct type *t = check_typedef (value_type (v)); 443 444 if (TYPE_CODE (t) == TYPE_CODE_STRUCT) 445 v = value_addr (v); 446 opts = *options; 447 opts.deref_ref = 0; 448 common_val_print (v, stream, recurse + 1, 449 &opts, current_language); 450 } 451 } 452 else if (TYPE_FIELD_TYPE (type, i) == NULL) 453 fputs_filtered ("<unknown type>", stream); 454 else 455 { 456 struct value_print_options opts = *options; 457 458 opts.deref_ref = 0; 459 val_print (TYPE_FIELD_TYPE (type, i), 460 valaddr, 461 offset + TYPE_FIELD_BITPOS (type, i) / 8, 462 address, stream, recurse + 1, val, &opts, 463 current_language); 464 } 465 } 466 annotate_field_end (); 467 } 468 469 if (options->pretty) 470 { 471 fprintf_filtered (stream, "\n"); 472 print_spaces_filtered (2 * recurse, stream); 473 } 474 } 475 fprintf_filtered (stream, "}"); 476 } 477 478 /* See val_print for a description of the various parameters of this 479 function; they are identical. The semantics of the return value is 480 also identical to val_print. */ 481 482 int 483 java_val_print (struct type *type, const gdb_byte *valaddr, 484 int embedded_offset, CORE_ADDR address, 485 struct ui_file *stream, int recurse, 486 const struct value *val, 487 const struct value_print_options *options) 488 { 489 struct gdbarch *gdbarch = get_type_arch (type); 490 unsigned int i = 0; /* Number of characters printed. */ 491 struct type *target_type; 492 CORE_ADDR addr; 493 494 CHECK_TYPEDEF (type); 495 switch (TYPE_CODE (type)) 496 { 497 case TYPE_CODE_PTR: 498 if (options->format && options->format != 's') 499 { 500 val_print_scalar_formatted (type, valaddr, embedded_offset, 501 val, options, 0, stream); 502 break; 503 } 504 #if 0 505 if (options->vtblprint && cp_is_vtbl_ptr_type (type)) 506 { 507 /* Print the unmangled name if desired. */ 508 /* Print vtable entry - we only get here if we ARE using 509 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */ 510 /* Extract an address, assume that it is unsigned. */ 511 print_address_demangle 512 (gdbarch, 513 extract_unsigned_integer (valaddr + embedded_offset, 514 TYPE_LENGTH (type)), 515 stream, demangle); 516 break; 517 } 518 #endif 519 addr = unpack_pointer (type, valaddr + embedded_offset); 520 if (addr == 0) 521 { 522 fputs_filtered ("null", stream); 523 return i; 524 } 525 target_type = check_typedef (TYPE_TARGET_TYPE (type)); 526 527 if (TYPE_CODE (target_type) == TYPE_CODE_FUNC) 528 { 529 /* Try to print what function it points to. */ 530 print_address_demangle (gdbarch, addr, stream, demangle); 531 /* Return value is irrelevant except for string pointers. */ 532 return (0); 533 } 534 535 if (options->addressprint && options->format != 's') 536 { 537 fputs_filtered ("@", stream); 538 print_longest (stream, 'x', 0, (ULONGEST) addr); 539 } 540 541 return i; 542 543 case TYPE_CODE_CHAR: 544 case TYPE_CODE_INT: 545 /* Can't just call c_val_print because that prints bytes as C 546 chars. */ 547 if (options->format || options->output_format) 548 { 549 struct value_print_options opts = *options; 550 551 opts.format = (options->format ? options->format 552 : options->output_format); 553 val_print_scalar_formatted (type, valaddr, embedded_offset, 554 val, &opts, 0, stream); 555 } 556 else if (TYPE_CODE (type) == TYPE_CODE_CHAR 557 || (TYPE_CODE (type) == TYPE_CODE_INT 558 && TYPE_LENGTH (type) == 2 559 && strcmp (TYPE_NAME (type), "char") == 0)) 560 LA_PRINT_CHAR ((int) unpack_long (type, valaddr + embedded_offset), 561 type, stream); 562 else 563 val_print_type_code_int (type, valaddr + embedded_offset, stream); 564 break; 565 566 case TYPE_CODE_STRUCT: 567 java_print_value_fields (type, valaddr, embedded_offset, 568 address, stream, recurse, val, options); 569 break; 570 571 default: 572 return c_val_print (type, valaddr, embedded_offset, address, stream, 573 recurse, val, options); 574 } 575 576 return 0; 577 } 578