gdb/jv-valprint.c

   1 /* Support for printing Java values for GDB, the GNU debugger.
   2    Copyright 1997, 1998, 1999, 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 #include "gdb_string.h"
  34
  35 /* Local functions */
  36
  37 static void java_print_value_fields (struct type * type, char *valaddr,
  38                                      CORE_ADDR address,
  39                                      struct ui_file *stream, int format,
  40                                      int recurse,
  41                                      enum val_prettyprint pretty);
  42
  43
  44 int
  45 java_value_print (struct value *val, struct ui_file *stream, int format,
  46                   enum val_prettyprint pretty)
  47 {
  48   struct type *type;
  49   CORE_ADDR address;
  50   int i;
  51   char *name;
  52
  53   type = VALUE_TYPE (val);
  54   address = VALUE_ADDRESS (val) + VALUE_OFFSET (val);
  55
  56   if (is_object_type (type))
  57     {
  58       CORE_ADDR obj_addr;
  59
  60       /* Get the run-time type, and cast the object into that */
  61
  62       obj_addr = unpack_pointer (type, VALUE_CONTENTS (val));
  63
  64       if (obj_addr != 0)
  65         {
  66           type = type_from_class (java_class_from_object (val));
  67           type = lookup_pointer_type (type);
  68
  69           val = value_at (type, address, NULL);
  70         }
  71     }
  72
  73   if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val))
  74     type_print (TYPE_TARGET_TYPE (type), "", stream, -1);
  75
  76   name = TYPE_TAG_NAME (type);
  77   if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL
  78       && (i = strlen (name), name[i - 1] == ']'))
  79     {
  80       char buf4[4];
  81       long length;
  82       unsigned int things_printed = 0;
  83       int reps;
  84       struct type *el_type = java_primitive_type_from_name (name, i - 2);
  85
  86       i = 0;
  87       read_memory (address + JAVA_OBJECT_SIZE, buf4, 4);
  88
  89       length = (long) extract_signed_integer (buf4, 4);
  90       fprintf_filtered (stream, "{length: %ld", length);
  91
  92       if (el_type == NULL)
  93         {
  94           CORE_ADDR element;
  95           CORE_ADDR next_element = -1; /* dummy initial value */
  96
  97           address += JAVA_OBJECT_SIZE + 4;      /* Skip object header and length. */
  98
  99           while (i < length && things_printed < print_max)
 100             {
 101               char *buf;
 102
 103               buf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT);
 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           struct value *v = allocate_value (el_type);
 142           struct value *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                   struct value *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_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 (val_print (type, VALUE_CONTENTS (val), 0, address,
 236                      stream, format, 1, 0, pretty));
 237 }
 238
 239 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
 240    same meanings as in cp_print_value and c_val_print.
 241
 242    DONT_PRINT is an array of baseclass types that we
 243    should not print, or zero if called from top level.  */
 244
 245 static void
 246 java_print_value_fields (struct type *type, char *valaddr, CORE_ADDR address,
 247                          struct ui_file *stream, int format, int recurse,
 248                          enum val_prettyprint pretty)
 249 {
 250   int i, len, n_baseclasses;
 251
 252   CHECK_TYPEDEF (type);
 253
 254   fprintf_filtered (stream, "{");
 255   len = TYPE_NFIELDS (type);
 256   n_baseclasses = TYPE_N_BASECLASSES (type);
 257
 258   if (n_baseclasses > 0)
 259     {
 260       int i, n_baseclasses = TYPE_N_BASECLASSES (type);
 261
 262       for (i = 0; i < n_baseclasses; i++)
 263         {
 264           int boffset;
 265           struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
 266           char *basename = TYPE_NAME (baseclass);
 267           char *base_valaddr;
 268
 269           if (BASETYPE_VIA_VIRTUAL (type, i))
 270             continue;
 271
 272           if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
 273             continue;
 274
 275           boffset = 0;
 276
 277           if (pretty)
 278             {
 279               fprintf_filtered (stream, "\n");
 280               print_spaces_filtered (2 * (recurse + 1), stream);
 281             }
 282           fputs_filtered ("<", stream);
 283           /* Not sure what the best notation is in the case where there is no
 284              baseclass name.  */
 285           fputs_filtered (basename ? basename : "", stream);
 286           fputs_filtered ("> = ", stream);
 287
 288           base_valaddr = valaddr;
 289
 290           java_print_value_fields (baseclass, base_valaddr, address + boffset,
 291                                    stream, format, recurse + 1, pretty);
 292           fputs_filtered (", ", stream);
 293
 294         flush_it:
 295           ;
 296         }
 297
 298     }
 299
 300   if (!len && n_baseclasses == 1)
 301     fprintf_filtered (stream, "<No data fields>");
 302   else
 303     {
 304       extern int inspect_it;
 305       int fields_seen = 0;
 306
 307       for (i = n_baseclasses; i < len; i++)
 308         {
 309           /* If requested, skip printing of static fields.  */
 310           if (TYPE_FIELD_STATIC (type, i))
 311             {
 312               char *name = TYPE_FIELD_NAME (type, i);
 313               if (!static_field_print)
 314                 continue;
 315               if (name != NULL && strcmp (name, "class") == 0)
 316                 continue;
 317             }
 318           if (fields_seen)
 319             fprintf_filtered (stream, ", ");
 320           else if (n_baseclasses > 0)
 321             {
 322               if (pretty)
 323                 {
 324                   fprintf_filtered (stream, "\n");
 325                   print_spaces_filtered (2 + 2 * recurse, stream);
 326                   fputs_filtered ("members of ", stream);
 327                   fputs_filtered (type_name_no_tag (type), stream);
 328                   fputs_filtered (": ", stream);
 329                 }
 330             }
 331           fields_seen = 1;
 332
 333           if (pretty)
 334             {
 335               fprintf_filtered (stream, "\n");
 336               print_spaces_filtered (2 + 2 * recurse, stream);
 337             }
 338           else
 339             {
 340               wrap_here (n_spaces (2 + 2 * recurse));
 341             }
 342           if (inspect_it)
 343             {
 344               if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
 345                 fputs_filtered ("\"( ptr \"", stream);
 346               else
 347                 fputs_filtered ("\"( nodef \"", stream);
 348               if (TYPE_FIELD_STATIC (type, i))
 349                 fputs_filtered ("static ", stream);
 350               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 351                                        language_cplus,
 352                                        DMGL_PARAMS | DMGL_ANSI);
 353               fputs_filtered ("\" \"", stream);
 354               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 355                                        language_cplus,
 356                                        DMGL_PARAMS | DMGL_ANSI);
 357               fputs_filtered ("\") \"", stream);
 358             }
 359           else
 360             {
 361               annotate_field_begin (TYPE_FIELD_TYPE (type, i));
 362
 363               if (TYPE_FIELD_STATIC (type, i))
 364                 fputs_filtered ("static ", stream);
 365               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 366                                        language_cplus,
 367                                        DMGL_PARAMS | DMGL_ANSI);
 368               annotate_field_name_end ();
 369               fputs_filtered (": ", stream);
 370               annotate_field_value ();
 371             }
 372
 373           if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
 374             {
 375               struct value *v;
 376
 377               /* Bitfields require special handling, especially due to byte
 378                  order problems.  */
 379               if (TYPE_FIELD_IGNORE (type, i))
 380                 {
 381                   fputs_filtered ("<optimized out or zero length>", stream);
 382                 }
 383               else
 384                 {
 385                   v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 386                                    unpack_field_as_long (type, valaddr, i));
 387
 388                   val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 389                              0, stream, format, 0, recurse + 1, pretty);
 390                 }
 391             }
 392           else
 393             {
 394               if (TYPE_FIELD_IGNORE (type, i))
 395                 {
 396                   fputs_filtered ("<optimized out or zero length>", stream);
 397                 }
 398               else if (TYPE_FIELD_STATIC (type, i))
 399                 {
 400                   struct value *v = value_static_field (type, i);
 401                   if (v == NULL)
 402                     fputs_filtered ("<optimized out>", stream);
 403                   else
 404                     {
 405                       struct type *t = check_typedef (VALUE_TYPE (v));
 406                       if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
 407                         v = value_addr (v);
 408                       val_print (VALUE_TYPE (v),
 409                                  VALUE_CONTENTS (v), 0, VALUE_ADDRESS (v),
 410                                  stream, format, 0, recurse + 1, pretty);
 411                     }
 412                 }
 413               else if (TYPE_FIELD_TYPE (type, i) == NULL)
 414                 fputs_filtered ("<unknown type>", stream);
 415               else
 416                 {
 417                   val_print (TYPE_FIELD_TYPE (type, i),
 418                              valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0,
 419                              address + TYPE_FIELD_BITPOS (type, i) / 8,
 420                              stream, format, 0, recurse + 1, pretty);
 421                 }
 422             }
 423           annotate_field_end ();
 424         }
 425
 426       if (pretty)
 427         {
 428           fprintf_filtered (stream, "\n");
 429           print_spaces_filtered (2 * recurse, stream);
 430         }
 431     }
 432   fprintf_filtered (stream, "}");
 433 }
 434
 435 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 436    the inferior at address ADDRESS, onto stdio stream STREAM according to
 437    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
 438    target byte order.
 439
 440    If the data are a string pointer, returns the number of string characters
 441    printed.
 442
 443    If DEREF_REF is nonzero, then dereference references, otherwise just print
 444    them like pointers.
 445
 446    The PRETTY parameter controls prettyprinting.  */
 447
 448 int
 449 java_val_print (struct type *type, char *valaddr, int embedded_offset,
 450                 CORE_ADDR address, struct ui_file *stream, int format,
 451                 int deref_ref, int recurse, enum val_prettyprint pretty)
 452 {
 453   register unsigned int i = 0;  /* Number of characters printed */
 454   struct type *target_type;
 455   CORE_ADDR addr;
 456
 457   CHECK_TYPEDEF (type);
 458   switch (TYPE_CODE (type))
 459     {
 460     case TYPE_CODE_PTR:
 461       if (format && format != 's')
 462         {
 463           print_scalar_formatted (valaddr, type, format, 0, stream);
 464           break;
 465         }
 466 #if 0
 467       if (vtblprint && cp_is_vtbl_ptr_type (type))
 468         {
 469           /* Print the unmangled name if desired.  */
 470           /* Print vtable entry - we only get here if we ARE using
 471              -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */
 472           print_address_demangle (extract_address (valaddr, TYPE_LENGTH (type)),
 473                                   stream, demangle);
 474           break;
 475         }
 476 #endif
 477       addr = unpack_pointer (type, valaddr);
 478       if (addr == 0)
 479         {
 480           fputs_filtered ("null", stream);
 481           return i;
 482         }
 483       target_type = check_typedef (TYPE_TARGET_TYPE (type));
 484
 485       if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)
 486         {
 487           /* Try to print what function it points to.  */
 488           print_address_demangle (addr, stream, demangle);
 489           /* Return value is irrelevant except for string pointers.  */
 490           return (0);
 491         }
 492
 493       if (addressprint && format != 's')
 494         {
 495           fputs_filtered ("@", stream);
 496           print_longest (stream, 'x', 0, (ULONGEST) addr);
 497         }
 498
 499       return i;
 500
 501     case TYPE_CODE_CHAR:
 502     case TYPE_CODE_INT:
 503       /* Can't just call c_val_print because that prints bytes as C
 504          chars.  */
 505       format = format ? format : output_format;
 506       if (format)
 507         print_scalar_formatted (valaddr, type, format, 0, stream);
 508       else if (TYPE_CODE (type) == TYPE_CODE_CHAR
 509                || (TYPE_CODE (type) == TYPE_CODE_INT
 510                    && TYPE_LENGTH (type) == 2
 511                    && strcmp (TYPE_NAME (type), "char") == 0))
 512         LA_PRINT_CHAR ((int) unpack_long (type, valaddr), stream);
 513       else
 514         val_print_type_code_int (type, valaddr, stream);
 515       break;
 516
 517     case TYPE_CODE_STRUCT:
 518       java_print_value_fields (type, valaddr, address, stream, format,
 519                                recurse, pretty);
 520       break;
 521
 522     default:
 523       return c_val_print (type, valaddr, embedded_offset, address, stream,
 524                           format, deref_ref, recurse, pretty);
 525     }
 526
 527   return 0;
 528 }