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