gdb/jv-valprint.c

   1 /* Support for printing Java values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1997-2015 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 #include "defs.h"
  21 #include "symtab.h"
  22 #include "gdbtypes.h"
  23 #include "gdbcore.h"
  24 #include "expression.h"
  25 #include "value.h"
  26 #include "demangle.h"
  27 #include "valprint.h"
  28 #include "language.h"
  29 #include "jv-lang.h"
  30 #include "c-lang.h"
  31 #include "annotate.h"
  32 /* Local functions */
  33
  34 void
  35 java_value_print (struct value *val, struct ui_file *stream,
  36                   const struct value_print_options *options)
  37 {
  38   struct gdbarch *gdbarch = get_type_arch (value_type (val));
  39   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  40   struct type *type;
  41   CORE_ADDR address;
  42   int i;
  43   const char *name;
  44   struct value_print_options opts;
  45
  46   type = value_type (val);
  47   address = value_address (val);
  48
  49   if (is_object_type (type))
  50     {
  51       CORE_ADDR obj_addr;
  52       struct value *tem = val;
  53
  54       /* Get the run-time type, and cast the object into that.  */
  55       while (TYPE_CODE (value_type (tem)) == TYPE_CODE_PTR)
  56         tem = value_ind (tem);
  57
  58       obj_addr = value_address (tem);
  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           type = value_type (val);
  67         }
  68     }
  69
  70   if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val))
  71     type_print (TYPE_TARGET_TYPE (type), "", stream, -1);
  72
  73   name = TYPE_TAG_NAME (type);
  74   if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL
  75       && (i = strlen (name), name[i - 1] == ']'))
  76     {
  77       gdb_byte buf4[4];
  78       long length;
  79       unsigned int things_printed = 0;
  80       int reps;
  81       struct type *el_type
  82         = java_primitive_type_from_name (gdbarch, name, i - 2);
  83
  84       i = 0;
  85       read_memory (address + get_java_object_header_size (gdbarch), buf4, 4);
  86
  87       length = (long) extract_signed_integer (buf4, 4, byte_order);
  88       fprintf_filtered (stream, "{length: %ld", length);
  89
  90       if (el_type == NULL)
  91         {
  92           CORE_ADDR element;
  93           CORE_ADDR next_element = -1; /* Dummy initial value.  */
  94
  95           /* Skip object header and length.  */
  96           address += get_java_object_header_size (gdbarch) + 4;
  97
  98           while (i < length && things_printed < options->print_max)
  99             {
 100               gdb_byte *buf;
 101
 102               buf = alloca (gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT);
 103               fputs_filtered (", ", stream);
 104               wrap_here (n_spaces (2));
 105
 106               if (i > 0)
 107                 element = next_element;
 108               else
 109                 {
 110                   read_memory (address, buf, sizeof (buf));
 111                   address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT;
 112                   /* FIXME: cagney/2003-05-24: Bogus or what.  It
 113                      pulls a host sized pointer out of the target and
 114                      then extracts that as an address (while assuming
 115                      that the address is unsigned)!  */
 116                   element = extract_unsigned_integer (buf, sizeof (buf),
 117                                                       byte_order);
 118                 }
 119
 120               for (reps = 1; i + reps < length; reps++)
 121                 {
 122                   read_memory (address, buf, sizeof (buf));
 123                   address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT;
 124                   /* FIXME: cagney/2003-05-24: Bogus or what.  It
 125                      pulls a host sized pointer out of the target and
 126                      then extracts that as an address (while assuming
 127                      that the address is unsigned)!  */
 128                   next_element = extract_unsigned_integer (buf, sizeof (buf),
 129                                                            byte_order);
 130                   if (next_element != element)
 131                     break;
 132                 }
 133
 134               if (reps == 1)
 135                 fprintf_filtered (stream, "%d: ", i);
 136               else
 137                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 138
 139               if (element == 0)
 140                 fprintf_filtered (stream, "null");
 141               else
 142                 fprintf_filtered (stream, "@%s", paddress (gdbarch, element));
 143
 144               things_printed++;
 145               i += reps;
 146             }
 147         }
 148       else
 149         {
 150           struct value *v = allocate_value (el_type);
 151           struct value *next_v = allocate_value (el_type);
 152
 153           set_value_address (v, (address
 154                                  + get_java_object_header_size (gdbarch) + 4));
 155           set_value_address (next_v, value_raw_address (v));
 156
 157           while (i < length && things_printed < options->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                   set_value_lazy (v, 1);
 173                   set_value_offset (v, 0);
 174                 }
 175
 176               set_value_offset (next_v, value_offset (v));
 177
 178               for (reps = 1; i + reps < length; reps++)
 179                 {
 180                   set_value_lazy (next_v, 1);
 181                   set_value_offset (next_v, value_offset (next_v)
 182                                     + TYPE_LENGTH (el_type));
 183                   value_fetch_lazy (next_v);
 184                   if (!value_contents_eq (v, value_embedded_offset (v),
 185                                           next_v,
 186                                           value_embedded_offset (next_v),
 187                                           TYPE_LENGTH (el_type)))
 188                     break;
 189                 }
 190
 191               if (reps == 1)
 192                 fprintf_filtered (stream, "%d: ", i);
 193               else
 194                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 195
 196               opts = *options;
 197               opts.deref_ref = 1;
 198               common_val_print (v, stream, 1, &opts, current_language);
 199
 200               things_printed++;
 201               i += reps;
 202             }
 203         }
 204
 205       if (i < length)
 206         fprintf_filtered (stream, "...");
 207
 208       fprintf_filtered (stream, "}");
 209
 210       return;
 211     }
 212
 213   /* If it's type String, print it.  */
 214
 215   if (TYPE_CODE (type) == TYPE_CODE_PTR
 216       && TYPE_TARGET_TYPE (type)
 217       && TYPE_TAG_NAME (TYPE_TARGET_TYPE (type))
 218       && strcmp (TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)),
 219                  "java.lang.String") == 0
 220       && (options->format == 0 || options->format == 's')
 221       && address != 0
 222       && value_as_address (val) != 0)
 223     {
 224       struct type *char_type;
 225       struct value *data_val;
 226       CORE_ADDR data;
 227       struct value *boffset_val;
 228       unsigned long boffset;
 229       struct value *count_val;
 230       unsigned long count;
 231       struct value *mark;
 232
 233       fputs_filtered (" ", stream);
 234
 235       mark = value_mark ();     /* Remember start of new values.  */
 236
 237       data_val = value_struct_elt (&val, NULL, "data", NULL, NULL);
 238       data = value_as_address (data_val);
 239
 240       boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL);
 241       boffset = value_as_address (boffset_val);
 242
 243       count_val = value_struct_elt (&val, NULL, "count", NULL, NULL);
 244       count = value_as_address (count_val);
 245
 246       value_free_to_mark (mark);        /* Release unnecessary values.  */
 247
 248       char_type = builtin_java_type (gdbarch)->builtin_char;
 249       val_print_string (char_type, NULL, data + boffset, count, stream,
 250                         options);
 251
 252       return;
 253     }
 254
 255   opts = *options;
 256   opts.deref_ref = 1;
 257   common_val_print (val, stream, 0, &opts, current_language);
 258 }
 259
 260 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the
 261    same meanings as in cp_print_value and c_val_print.
 262
 263    DONT_PRINT is an array of baseclass types that we
 264    should not print, or zero if called from top level.  */
 265
 266 static void
 267 java_print_value_fields (struct type *type, const gdb_byte *valaddr,
 268                          int offset,
 269                          CORE_ADDR address, struct ui_file *stream,
 270                          int recurse,
 271                          const struct value *val,
 272                          const struct value_print_options *options)
 273 {
 274   int i, len, n_baseclasses;
 275
 276   CHECK_TYPEDEF (type);
 277
 278   fprintf_filtered (stream, "{");
 279   len = TYPE_NFIELDS (type);
 280   n_baseclasses = TYPE_N_BASECLASSES (type);
 281
 282   if (n_baseclasses > 0)
 283     {
 284       int i, n_baseclasses = TYPE_N_BASECLASSES (type);
 285
 286       for (i = 0; i < n_baseclasses; i++)
 287         {
 288           int boffset;
 289           struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
 290           const char *basename = TYPE_NAME (baseclass);
 291           const gdb_byte *base_valaddr;
 292
 293           if (BASETYPE_VIA_VIRTUAL (type, i))
 294             continue;
 295
 296           if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
 297             continue;
 298
 299           boffset = 0;
 300
 301           if (options->prettyformat)
 302             {
 303               fprintf_filtered (stream, "\n");
 304               print_spaces_filtered (2 * (recurse + 1), stream);
 305             }
 306           fputs_filtered ("<", stream);
 307           /* Not sure what the best notation is in the case where there is no
 308              baseclass name.  */
 309           fputs_filtered (basename ? basename : "", stream);
 310           fputs_filtered ("> = ", stream);
 311
 312           base_valaddr = valaddr;
 313
 314           java_print_value_fields (baseclass, base_valaddr,
 315                                    offset + boffset, address,
 316                                    stream, recurse + 1, val, options);
 317           fputs_filtered (", ", stream);
 318         }
 319     }
 320
 321   if (!len && n_baseclasses == 1)
 322     fprintf_filtered (stream, "<No data fields>");
 323   else
 324     {
 325       int fields_seen = 0;
 326
 327       for (i = n_baseclasses; i < len; i++)
 328         {
 329           /* If requested, skip printing of static fields.  */
 330           if (field_is_static (&TYPE_FIELD (type, i)))
 331             {
 332               const char *name = TYPE_FIELD_NAME (type, i);
 333
 334               if (!options->static_field_print)
 335                 continue;
 336               if (name != NULL && strcmp (name, "class") == 0)
 337                 continue;
 338             }
 339           if (fields_seen)
 340             fprintf_filtered (stream, ", ");
 341           else if (n_baseclasses > 0)
 342             {
 343               if (options->prettyformat)
 344                 {
 345                   fprintf_filtered (stream, "\n");
 346                   print_spaces_filtered (2 + 2 * recurse, stream);
 347                   fputs_filtered ("members of ", stream);
 348                   fputs_filtered (type_name_no_tag (type), stream);
 349                   fputs_filtered (": ", stream);
 350                 }
 351             }
 352           fields_seen = 1;
 353
 354           if (options->prettyformat)
 355             {
 356               fprintf_filtered (stream, "\n");
 357               print_spaces_filtered (2 + 2 * recurse, stream);
 358             }
 359           else
 360             {
 361               wrap_here (n_spaces (2 + 2 * recurse));
 362             }
 363
 364           annotate_field_begin (TYPE_FIELD_TYPE (type, i));
 365
 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           annotate_field_name_end ();
 372           fputs_filtered (": ", stream);
 373           annotate_field_value ();
 374
 375           if (!field_is_static (&TYPE_FIELD (type, i))
 376               && TYPE_FIELD_PACKED (type, i))
 377             {
 378               struct value *v;
 379
 380               /* Bitfields require special handling, especially due to byte
 381                  order problems.  */
 382               if (TYPE_FIELD_IGNORE (type, i))
 383                 {
 384                   fputs_filtered ("<optimized out or zero length>", stream);
 385                 }
 386               else if (value_bits_synthetic_pointer (val,
 387                                                      TYPE_FIELD_BITPOS (type,
 388                                                                         i),
 389                                                      TYPE_FIELD_BITSIZE (type,
 390                                                                          i)))
 391                 {
 392                   fputs_filtered (_("<synthetic pointer>"), stream);
 393                 }
 394               else
 395                 {
 396                   struct value_print_options opts;
 397
 398                   v = value_field_bitfield (type, i, valaddr, offset, val);
 399
 400                   opts = *options;
 401                   opts.deref_ref = 0;
 402                   common_val_print (v, stream, recurse + 1,
 403                                     &opts, current_language);
 404                 }
 405             }
 406           else
 407             {
 408               if (TYPE_FIELD_IGNORE (type, i))
 409                 {
 410                   fputs_filtered ("<optimized out or zero length>", stream);
 411                 }
 412               else if (field_is_static (&TYPE_FIELD (type, i)))
 413                 {
 414                   struct value_print_options opts;
 415                   struct value *v = value_static_field (type, i);
 416                   struct type *t = check_typedef (value_type (v));
 417
 418                   if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
 419                     v = value_addr (v);
 420                   opts = *options;
 421                   opts.deref_ref = 0;
 422                   common_val_print (v, stream, recurse + 1,
 423                                     &opts, current_language);
 424                 }
 425               else if (TYPE_FIELD_TYPE (type, i) == NULL)
 426                 fputs_filtered ("<unknown type>", stream);
 427               else
 428                 {
 429                   struct value_print_options opts = *options;
 430
 431                   opts.deref_ref = 0;
 432                   val_print (TYPE_FIELD_TYPE (type, i),
 433                              valaddr,
 434                              offset + TYPE_FIELD_BITPOS (type, i) / 8,
 435                              address, stream, recurse + 1, val, &opts,
 436                              current_language);
 437                 }
 438             }
 439           annotate_field_end ();
 440         }
 441
 442       if (options->prettyformat)
 443         {
 444           fprintf_filtered (stream, "\n");
 445           print_spaces_filtered (2 * recurse, stream);
 446         }
 447     }
 448   fprintf_filtered (stream, "}");
 449 }
 450
 451 /* See val_print for a description of the various parameters of this
 452    function; they are identical.  */
 453
 454 void
 455 java_val_print (struct type *type, const gdb_byte *valaddr,
 456                 int embedded_offset, CORE_ADDR address,
 457                 struct ui_file *stream, int recurse,
 458                 const struct value *val,
 459                 const struct value_print_options *options)
 460 {
 461   struct gdbarch *gdbarch = get_type_arch (type);
 462   struct type *target_type;
 463   CORE_ADDR addr;
 464
 465   CHECK_TYPEDEF (type);
 466   switch (TYPE_CODE (type))
 467     {
 468     case TYPE_CODE_PTR:
 469       if (options->format && options->format != 's')
 470         {
 471           val_print_scalar_formatted (type, valaddr, embedded_offset,
 472                                       val, options, 0, stream);
 473           break;
 474         }
 475       addr = unpack_pointer (type, valaddr + embedded_offset);
 476       if (addr == 0)
 477         {
 478           fputs_filtered ("null", stream);
 479           return;
 480         }
 481       target_type = check_typedef (TYPE_TARGET_TYPE (type));
 482
 483       if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)
 484         {
 485           /* Try to print what function it points to.  */
 486           print_address_demangle (options, gdbarch, addr, stream, demangle);
 487           return;
 488         }
 489
 490       if (options->addressprint && options->format != 's')
 491         {
 492           fputs_filtered ("@", stream);
 493           print_longest (stream, 'x', 0, (ULONGEST) addr);
 494         }
 495
 496       return;
 497
 498     case TYPE_CODE_CHAR:
 499     case TYPE_CODE_INT:
 500       /* Can't just call c_val_print because that prints bytes as C
 501          chars.  */
 502       if (options->format || options->output_format)
 503         {
 504           struct value_print_options opts = *options;
 505
 506           opts.format = (options->format ? options->format
 507                          : options->output_format);
 508           val_print_scalar_formatted (type, valaddr, embedded_offset,
 509                                       val, &opts, 0, stream);
 510         }
 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 + embedded_offset),
 516                        type, stream);
 517       else
 518         val_print_type_code_int (type, valaddr + embedded_offset, stream);
 519       break;
 520
 521     case TYPE_CODE_STRUCT:
 522       java_print_value_fields (type, valaddr, embedded_offset,
 523                                address, stream, recurse, val, options);
 524       break;
 525
 526     default:
 527       c_val_print (type, valaddr, embedded_offset, address, stream,
 528                    recurse, val, options);
 529       break;
 530     }
 531 }