gdb/jv-valprint.c

   1 /* Support for printing Java values for GDB, the GNU debugger.
   2    Copyright 1997-2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  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
  34 /* Local functions */
  35
  36 static void java_print_value_fields (struct type * type, char *valaddr,
  37                                      CORE_ADDR address,
  38                                      struct ui_file *stream, int format,
  39                                      int recurse,
  40                                      enum val_prettyprint pretty);
  41
  42
  43 int
  44 java_value_print (val, stream, format, pretty)
  45      value_ptr val;
  46      struct ui_file *stream;
  47      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, next_element;
  97
  98           address += JAVA_OBJECT_SIZE + 4;      /* Skip object header and length. */
  99
 100           while (i < length && things_printed < print_max)
 101             {
 102               char buf[TARGET_PTR_BIT / HOST_CHAR_BIT];
 103
 104               fputs_filtered (", ", stream);
 105               wrap_here (n_spaces (2));
 106
 107               if (i > 0)
 108                 element = next_element;
 109               else
 110                 {
 111                   read_memory (address, buf, sizeof (buf));
 112                   address += TARGET_PTR_BIT / HOST_CHAR_BIT;
 113                   element = extract_address (buf, sizeof (buf));
 114                 }
 115
 116               for (reps = 1; i + reps < length; reps++)
 117                 {
 118                   read_memory (address, buf, sizeof (buf));
 119                   address += TARGET_PTR_BIT / HOST_CHAR_BIT;
 120                   next_element = extract_address (buf, sizeof (buf));
 121                   if (next_element != element)
 122                     break;
 123                 }
 124
 125               if (reps == 1)
 126                 fprintf_filtered (stream, "%d: ", i);
 127               else
 128                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 129
 130               if (element == 0)
 131                 fprintf_filtered (stream, "null");
 132               else
 133                 fprintf_filtered (stream, "@%s", paddr_nz (element));
 134
 135               things_printed++;
 136               i += reps;
 137             }
 138         }
 139       else
 140         {
 141           value_ptr v = allocate_value (el_type);
 142           value_ptr next_v = allocate_value (el_type);
 143
 144           VALUE_ADDRESS (v) = address + JAVA_OBJECT_SIZE + 4;
 145           VALUE_ADDRESS (next_v) = VALUE_ADDRESS (v);
 146
 147           while (i < length && things_printed < print_max)
 148             {
 149               fputs_filtered (", ", stream);
 150               wrap_here (n_spaces (2));
 151
 152               if (i > 0)
 153                 {
 154                   value_ptr tmp;
 155
 156                   tmp = next_v;
 157                   next_v = v;
 158                   v = tmp;
 159                 }
 160               else
 161                 {
 162                   VALUE_LAZY (v) = 1;
 163                   VALUE_OFFSET (v) = 0;
 164                 }
 165
 166               VALUE_OFFSET (next_v) = VALUE_OFFSET (v);
 167
 168               for (reps = 1; i + reps < length; reps++)
 169                 {
 170                   VALUE_LAZY (next_v) = 1;
 171                   VALUE_OFFSET (next_v) += TYPE_LENGTH (el_type);
 172                   if (memcmp (VALUE_CONTENTS (v), VALUE_CONTENTS (next_v),
 173                               TYPE_LENGTH (el_type)) != 0)
 174                     break;
 175                 }
 176
 177               if (reps == 1)
 178                 fprintf_filtered (stream, "%d: ", i);
 179               else
 180                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 181
 182               val_print (VALUE_TYPE (v), VALUE_CONTENTS (v), 0, 0,
 183                          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_NAME (TYPE_TARGET_TYPE (type))
 203     && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "java.lang.String") == 0
 204       && (format == 0 || format == 's')
 205       && address != 0)
 206     {
 207       value_ptr data_val;
 208       CORE_ADDR data;
 209       value_ptr boffset_val;
 210       unsigned long boffset;
 211       value_ptr count_val;
 212       unsigned long count;
 213       value_ptr mark;
 214
 215       mark = value_mark ();     /* Remember start of new values */
 216
 217       data_val = value_struct_elt (&val, NULL, "data", NULL, NULL);
 218       data = value_as_pointer (data_val);
 219
 220       boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL);
 221       boffset = value_as_pointer (boffset_val);
 222
 223       count_val = value_struct_elt (&val, NULL, "count", NULL, NULL);
 224       count = value_as_pointer (count_val);
 225
 226       value_free_to_mark (mark);        /* Release unnecessary values */
 227
 228       val_print_string (data + boffset, count, 2, stream);
 229
 230       return 0;
 231     }
 232
 233   return (val_print (type, VALUE_CONTENTS (val), 0, address,
 234                      stream, format, 1, 0, pretty));
 235 }
 236
 237 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
 238    same meanings as in cp_print_value and c_val_print.
 239
 240    DONT_PRINT is an array of baseclass types that we
 241    should not print, or zero if called from top level.  */
 242
 243 static void
 244 java_print_value_fields (type, valaddr, address, stream,
 245                          format, recurse, pretty)
 246      struct type *type;
 247      char *valaddr;
 248      CORE_ADDR address;
 249      struct ui_file *stream;
 250      int format;
 251      int recurse;
 252      enum val_prettyprint pretty;
 253 {
 254   int i, len, n_baseclasses;
 255
 256   CHECK_TYPEDEF (type);
 257
 258   fprintf_filtered (stream, "{");
 259   len = TYPE_NFIELDS (type);
 260   n_baseclasses = TYPE_N_BASECLASSES (type);
 261
 262   if (n_baseclasses > 0)
 263     {
 264       int i, n_baseclasses = TYPE_N_BASECLASSES (type);
 265
 266       for (i = 0; i < n_baseclasses; i++)
 267         {
 268           int boffset;
 269           struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
 270           char *basename = TYPE_NAME (baseclass);
 271           char *base_valaddr;
 272
 273           if (BASETYPE_VIA_VIRTUAL (type, i))
 274             continue;
 275
 276           if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
 277             continue;
 278
 279           boffset = 0;
 280
 281           if (pretty)
 282             {
 283               fprintf_filtered (stream, "\n");
 284               print_spaces_filtered (2 * (recurse + 1), stream);
 285             }
 286           fputs_filtered ("<", stream);
 287           /* Not sure what the best notation is in the case where there is no
 288              baseclass name.  */
 289           fputs_filtered (basename ? basename : "", stream);
 290           fputs_filtered ("> = ", stream);
 291
 292           base_valaddr = valaddr;
 293
 294           java_print_value_fields (baseclass, base_valaddr, address + boffset,
 295                                    stream, format, recurse + 1, pretty);
 296           fputs_filtered (", ", stream);
 297
 298         flush_it:
 299           ;
 300         }
 301
 302     }
 303
 304   if (!len && n_baseclasses == 1)
 305     fprintf_filtered (stream, "<No data fields>");
 306   else
 307     {
 308       extern int inspect_it;
 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               value_ptr 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                   val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 393                              0, stream, format, 0, recurse + 1, pretty);
 394                 }
 395             }
 396           else
 397             {
 398               if (TYPE_FIELD_IGNORE (type, i))
 399                 {
 400                   fputs_filtered ("<optimized out or zero length>", stream);
 401                 }
 402               else if (TYPE_FIELD_STATIC (type, i))
 403                 {
 404                   value_ptr v = value_static_field (type, i);
 405                   if (v == NULL)
 406                     fputs_filtered ("<optimized out>", stream);
 407                   else
 408                     {
 409                       struct type *t = check_typedef (VALUE_TYPE (v));
 410                       if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
 411                         v = value_addr (v);
 412                       val_print (VALUE_TYPE (v),
 413                                  VALUE_CONTENTS (v), 0, VALUE_ADDRESS (v),
 414                                  stream, format, 0, recurse + 1, pretty);
 415                     }
 416                 }
 417               else if (TYPE_FIELD_TYPE (type, i) == NULL)
 418                 fputs_filtered ("<unknown type>", stream);
 419               else
 420                 {
 421                   val_print (TYPE_FIELD_TYPE (type, i),
 422                              valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0,
 423                              address + TYPE_FIELD_BITPOS (type, i) / 8,
 424                              stream, format, 0, recurse + 1, pretty);
 425                 }
 426             }
 427           annotate_field_end ();
 428         }
 429
 430       if (pretty)
 431         {
 432           fprintf_filtered (stream, "\n");
 433           print_spaces_filtered (2 * recurse, stream);
 434         }
 435     }
 436   fprintf_filtered (stream, "}");
 437 }
 438
 439 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 440    the inferior at address ADDRESS, onto stdio stream STREAM according to
 441    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
 442    target byte order.
 443
 444    If the data are a string pointer, returns the number of string characters
 445    printed.
 446
 447    If DEREF_REF is nonzero, then dereference references, otherwise just print
 448    them like pointers.
 449
 450    The PRETTY parameter controls prettyprinting.  */
 451
 452 int
 453 java_val_print (type, valaddr, embedded_offset, address, stream, format,
 454                 deref_ref, recurse, pretty)
 455      struct type *type;
 456      char *valaddr;
 457      int embedded_offset;
 458      CORE_ADDR address;
 459      struct ui_file *stream;
 460      int format;
 461      int deref_ref;
 462      int recurse;
 463      enum val_prettyprint pretty;
 464 {
 465   register unsigned int i = 0;  /* Number of characters printed */
 466   struct type *target_type;
 467   CORE_ADDR addr;
 468
 469   CHECK_TYPEDEF (type);
 470   switch (TYPE_CODE (type))
 471     {
 472     case TYPE_CODE_PTR:
 473       if (format && format != 's')
 474         {
 475           print_scalar_formatted (valaddr, type, format, 0, stream);
 476           break;
 477         }
 478 #if 0
 479       if (vtblprint && cp_is_vtbl_ptr_type (type))
 480         {
 481           /* Print the unmangled name if desired.  */
 482           /* Print vtable entry - we only get here if we ARE using
 483              -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */
 484           print_address_demangle (extract_address (valaddr, TYPE_LENGTH (type)),
 485                                   stream, demangle);
 486           break;
 487         }
 488 #endif
 489       addr = unpack_pointer (type, valaddr);
 490       if (addr == 0)
 491         {
 492           fputs_filtered ("null", stream);
 493           return i;
 494         }
 495       target_type = check_typedef (TYPE_TARGET_TYPE (type));
 496
 497       if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)
 498         {
 499           /* Try to print what function it points to.  */
 500           print_address_demangle (addr, stream, demangle);
 501           /* Return value is irrelevant except for string pointers.  */
 502           return (0);
 503         }
 504
 505       if (addressprint && format != 's')
 506         {
 507           fputs_filtered ("@", stream);
 508           print_longest (stream, 'x', 0, (ULONGEST) addr);
 509         }
 510
 511       return i;
 512
 513     case TYPE_CODE_CHAR:
 514       format = format ? format : output_format;
 515       if (format)
 516         print_scalar_formatted (valaddr, type, format, 0, stream);
 517       else
 518         LA_PRINT_CHAR ((int) unpack_long (type, valaddr), stream);
 519       break;
 520
 521     case TYPE_CODE_INT:
 522       /* Can't just call c_val_print because that print bytes as C chars. */
 523       format = format ? format : output_format;
 524       if (format)
 525         print_scalar_formatted (valaddr, type, format, 0, stream);
 526       else
 527         val_print_type_code_int (type, valaddr, stream);
 528       break;
 529
 530     case TYPE_CODE_STRUCT:
 531       java_print_value_fields (type, valaddr, address, stream, format,
 532                                recurse, pretty);
 533       break;
 534
 535     default:
 536       return c_val_print (type, valaddr, embedded_offset, address, stream,
 537                           format, deref_ref, recurse, pretty);
 538     }
 539
 540   return 0;
 541 }