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