gdb/jv-valprint.c

   1 /* Support for printing Java values for GDB, the GNU debugger.
   2    Copyright 1997 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, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "symtab.h"
  22 #include "gdbtypes.h"
  23 #include "expression.h"
  24 #include "value.h"
  25 #include "demangle.h"
  26 #include "valprint.h"
  27 #include "language.h"
  28 #include "jv-lang.h"
  29 #include "c-lang.h"
  30
  31 int
  32 java_value_print (val, stream, format, pretty)
  33      value_ptr val;
  34      GDB_FILE *stream;
  35      int format;
  36      enum val_prettyprint pretty;
  37 {
  38   struct type *type = VALUE_TYPE (val);
  39   CORE_ADDR address = VALUE_ADDRESS (val) + VALUE_OFFSET (val);
  40   if (is_object_type (type))
  41     {
  42       CORE_ADDR obj_addr = unpack_pointer (type, VALUE_CONTENTS (val));
  43       if (obj_addr != 0)
  44         {
  45           value_ptr obj_val
  46             = value_at (TYPE_TARGET_TYPE (type), obj_addr, NULL);
  47           type = type_from_class (java_class_from_object (obj_val));
  48           type = lookup_pointer_type (type);
  49         }
  50     }
  51   if (TYPE_CODE (type) == TYPE_CODE_PTR && ! value_logical_not (val))
  52     {
  53       type_print (TYPE_TARGET_TYPE (type), "", stream, -1);
  54     }
  55
  56   if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_TAG_NAME (type) != NULL
  57       && TYPE_TAG_NAME (type)[0] == '[')
  58     {
  59       char buf4[4];
  60       long length;
  61       unsigned int things_printed = 0;
  62       int i = 0;
  63       int reps;
  64       read_memory (address + JAVA_OBJECT_SIZE, buf4, 4);
  65       length = (long) extract_signed_integer (buf4, 4);
  66       fprintf_filtered (stream, "{length: %ld", length);
  67       if (TYPE_TAG_NAME (type)[1] == 'L'
  68           || TYPE_TAG_NAME (type)[1] == '[')
  69         {
  70           CORE_ADDR element, next_element;
  71           address += JAVA_OBJECT_SIZE + 4; /* Skip object header and length. */
  72           while (i < length && things_printed < print_max)
  73             {
  74               char buf[TARGET_PTR_BIT / HOST_CHAR_BIT];
  75               fputs_filtered (", ", stream);
  76               wrap_here (n_spaces (2));
  77               if (i > 0)
  78                 element = next_element;
  79               else
  80                 {
  81                   read_memory (address, buf, sizeof(buf));
  82                   address += TARGET_PTR_BIT / HOST_CHAR_BIT;
  83                   element = extract_address (buf, sizeof(buf));
  84                 }
  85               for (reps = 1;  i + reps < length;  reps++)
  86                 {
  87                   read_memory (address, buf, sizeof(buf));
  88                   address += TARGET_PTR_BIT / HOST_CHAR_BIT;
  89                   next_element = extract_address (buf, sizeof(buf));
  90                   if (next_element != element)
  91                     break;
  92                 }
  93               if (reps == 1)
  94                 fprintf_filtered (stream, "%d: ", i);
  95               else
  96                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
  97               if (element == 0)
  98                 fprintf_filtered (stream, "null");
  99               else
 100                 fprintf_filtered (stream, "@%x", element);
 101               things_printed++;
 102               i += reps;
 103             }
 104         }
 105       else
 106         {
 107           struct type *el_type = java_primitive_type (TYPE_TAG_NAME (type)[1]);
 108           value_ptr v = allocate_value (el_type);
 109           value_ptr next_v = allocate_value (el_type);
 110           VALUE_ADDRESS (v) = address + JAVA_OBJECT_SIZE + 4;
 111           VALUE_ADDRESS (next_v) = VALUE_ADDRESS (v);
 112
 113           while (i < length && things_printed < print_max)
 114             {
 115               fputs_filtered (", ", stream);
 116               wrap_here (n_spaces (2));
 117               if (i > 0)
 118                 {
 119                   value_ptr tmp = next_v;  next_v = v;   v = tmp;
 120                 }
 121               else
 122                 {
 123                   VALUE_LAZY (v) = 1;
 124                   VALUE_OFFSET (v) = 0;
 125                 }
 126               VALUE_OFFSET (next_v) = VALUE_OFFSET (v);
 127               for (reps = 1;  i + reps < length;  reps++)
 128                 {
 129                   VALUE_LAZY (next_v) = 1;
 130                   VALUE_OFFSET (next_v) += TYPE_LENGTH (el_type);
 131                   if (memcmp (VALUE_CONTENTS (v), VALUE_CONTENTS (next_v),
 132                               TYPE_LENGTH (el_type)) != 0)
 133                     break;
 134                 }
 135               if (reps == 1)
 136                 fprintf_filtered (stream, "%d: ", i);
 137               else
 138                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 139               val_print (VALUE_TYPE (v), VALUE_CONTENTS (v), 0,
 140                          stream, format, 2, 1, pretty);
 141               things_printed++;
 142               i += reps;
 143             }
 144         }
 145
 146       if (i < length)
 147         fprintf_filtered (stream, "...");
 148       fprintf_filtered (stream, "}");
 149       return 0;
 150     }
 151
 152   return (val_print (type, VALUE_CONTENTS (val), address,
 153                      stream, format, 1, 0, pretty));
 154 }
 155
 156 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
 157    same meanings as in cp_print_value and c_val_print.
 158
 159    DONT_PRINT is an array of baseclass types that we
 160    should not print, or zero if called from top level.  */
 161
 162 void
 163 java_print_value_fields (type, valaddr, address, stream,
 164                          format, recurse, pretty)
 165      struct type *type;
 166      char *valaddr;
 167      CORE_ADDR address;
 168      GDB_FILE *stream;
 169      int format;
 170      int recurse;
 171      enum val_prettyprint pretty;
 172 {
 173   int i, len, n_baseclasses;
 174
 175   CHECK_TYPEDEF (type);
 176
 177   fprintf_filtered (stream, "{");
 178   len = TYPE_NFIELDS (type);
 179   n_baseclasses = TYPE_N_BASECLASSES (type);
 180
 181   if (n_baseclasses > 0)
 182     {
 183       int i, n_baseclasses = TYPE_N_BASECLASSES (type);
 184
 185       for (i = 0; i < n_baseclasses; i++)
 186         {
 187           int boffset;
 188           struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
 189           char *basename = TYPE_NAME (baseclass);
 190           char *base_valaddr;
 191
 192           if (BASETYPE_VIA_VIRTUAL (type, i))
 193             continue;
 194
 195           if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
 196             continue;
 197
 198           boffset = 0;
 199
 200           if (pretty)
 201             {
 202               fprintf_filtered (stream, "\n");
 203               print_spaces_filtered (2 * (recurse+1), stream);
 204             }
 205           fputs_filtered ("<", stream);
 206           /* Not sure what the best notation is in the case where there is no
 207              baseclass name.  */
 208           fputs_filtered (basename ? basename : "", stream);
 209           fputs_filtered ("> = ", stream);
 210
 211           base_valaddr = valaddr;
 212
 213           java_print_value_fields (baseclass, base_valaddr, address + boffset,
 214                                    stream, format, recurse+1, pretty);
 215           fputs_filtered (", ", stream);
 216
 217         flush_it:
 218           ;
 219         }
 220
 221     }
 222
 223   if (!len && n_baseclasses == 1)
 224     fprintf_filtered (stream, "<No data fields>");
 225   else
 226     {
 227       extern int inspect_it;
 228       int fields_seen = 0;
 229
 230       for (i = n_baseclasses; i < len; i++)
 231         {
 232           /* If requested, skip printing of static fields.  */
 233           if (TYPE_FIELD_STATIC (type, i))
 234             {
 235               char *name = TYPE_FIELD_NAME (type, i);
 236               if (!static_field_print)
 237                 continue;
 238               if (name != NULL && strcmp (name, "class") == 0)
 239                 continue;
 240             }
 241           if (fields_seen)
 242             fprintf_filtered (stream, ", ");
 243           else if (n_baseclasses > 0)
 244             {
 245               if (pretty)
 246                 {
 247                   fprintf_filtered (stream, "\n");
 248                   print_spaces_filtered (2 + 2 * recurse, stream);
 249                   fputs_filtered ("members of ", stream);
 250                   fputs_filtered (type_name_no_tag (type), stream);
 251                   fputs_filtered (": ", stream);
 252                 }
 253             }
 254           fields_seen = 1;
 255
 256           if (pretty)
 257             {
 258               fprintf_filtered (stream, "\n");
 259               print_spaces_filtered (2 + 2 * recurse, stream);
 260             }
 261           else
 262             {
 263               wrap_here (n_spaces (2 + 2 * recurse));
 264             }
 265           if (inspect_it)
 266             {
 267               if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
 268                 fputs_filtered ("\"( ptr \"", stream);
 269               else
 270                 fputs_filtered ("\"( nodef \"", stream);
 271               if (TYPE_FIELD_STATIC (type, i))
 272                 fputs_filtered ("static ", stream);
 273               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 274                                        language_cplus,
 275                                        DMGL_PARAMS | DMGL_ANSI);
 276               fputs_filtered ("\" \"", stream);
 277               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 278                                        language_cplus,
 279                                        DMGL_PARAMS | DMGL_ANSI);
 280               fputs_filtered ("\") \"", stream);
 281             }
 282           else
 283             {
 284               annotate_field_begin (TYPE_FIELD_TYPE (type, i));
 285
 286               if (TYPE_FIELD_STATIC (type, i))
 287                 fputs_filtered ("static ", stream);
 288               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 289                                        language_cplus,
 290                                        DMGL_PARAMS | DMGL_ANSI);
 291               annotate_field_name_end ();
 292               fputs_filtered (": ", stream);
 293               annotate_field_value ();
 294             }
 295
 296           if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
 297             {
 298               value_ptr v;
 299
 300               /* Bitfields require special handling, especially due to byte
 301                  order problems.  */
 302               if (TYPE_FIELD_IGNORE (type, i))
 303                 {
 304                    fputs_filtered ("<optimized out or zero length>", stream);
 305                 }
 306               else
 307                 {
 308                    v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 309                                    unpack_field_as_long (type, valaddr, i));
 310
 311                    val_print (TYPE_FIELD_TYPE(type, i), VALUE_CONTENTS (v), 0,
 312                               stream, format, 0, recurse + 1, pretty);
 313                 }
 314             }
 315           else
 316             {
 317               if (TYPE_FIELD_IGNORE (type, i))
 318                 {
 319                    fputs_filtered ("<optimized out or zero length>", stream);
 320                 }
 321               else if (TYPE_FIELD_STATIC (type, i))
 322                 {
 323                   value_ptr v = value_static_field (type, i);
 324                   if (v == NULL)
 325                     fputs_filtered ("<optimized out>", stream);
 326                   else
 327                     {
 328                       struct type *t = check_typedef (VALUE_TYPE (v));
 329                       if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
 330                         v = value_addr (v);
 331                       val_print (VALUE_TYPE (v),
 332                                  VALUE_CONTENTS (v), VALUE_ADDRESS (v),
 333                                  stream, format, 0, recurse+1, pretty);
 334                     }
 335                 }
 336               else
 337                 {
 338                    val_print (TYPE_FIELD_TYPE (type, i),
 339                               valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 340                               address + TYPE_FIELD_BITPOS (type, i) / 8,
 341                               stream, format, 0, recurse + 1, pretty);
 342                 }
 343             }
 344           annotate_field_end ();
 345         }
 346
 347       if (pretty)
 348         {
 349           fprintf_filtered (stream, "\n");
 350           print_spaces_filtered (2 * recurse, stream);
 351         }
 352     }
 353   fprintf_filtered (stream, "}");
 354 }
 355
 356 int
 357 java_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
 358              pretty)
 359      struct type *type;
 360      char *valaddr;
 361      CORE_ADDR address;
 362      GDB_FILE *stream;
 363      int format;
 364      int deref_ref;
 365      int recurse;
 366      enum val_prettyprint pretty;
 367 {
 368   register unsigned int i = 0;          /* Number of characters printed */
 369   struct type *elttype;
 370   CORE_ADDR addr;
 371
 372   CHECK_TYPEDEF (type);
 373   switch (TYPE_CODE (type))
 374     {
 375     case TYPE_CODE_PTR:
 376       if (format && format != 's')
 377         {
 378           print_scalar_formatted (valaddr, type, format, 0, stream);
 379           break;
 380         }
 381 #if 0
 382       if (vtblprint && cp_is_vtbl_ptr_type(type))
 383         {
 384           /* Print the unmangled name if desired.  */
 385           /* Print vtable entry - we only get here if we ARE using
 386              -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */
 387           print_address_demangle(extract_address (valaddr, TYPE_LENGTH (type)),
 388                                  stream, demangle);
 389           break;
 390         }
 391 #endif
 392       addr = unpack_pointer (type, valaddr);
 393       if (addr == 0)
 394         {
 395           fputs_filtered ("null", stream);
 396           return i;
 397         }
 398       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 399         {
 400         print_unpacked_pointer:
 401           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 402
 403           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 404             {
 405               /* Try to print what function it points to.  */
 406               print_address_demangle (addr, stream, demangle);
 407               /* Return value is irrelevant except for string pointers.  */
 408               return (0);
 409             }
 410
 411           if (addressprint && format != 's')
 412             {
 413               fputs_filtered ("@", stream);
 414               print_longest (stream, 'x', 0, (ULONGEST) addr);
 415             }
 416           return i;
 417         }
 418     case TYPE_CODE_CHAR:
 419       format = format ? format : output_format;
 420       if (format)
 421         {
 422           print_scalar_formatted (valaddr, type, format, 0, stream);
 423         }
 424       else
 425         {
 426           LA_PRINT_CHAR ((int) unpack_long (type, valaddr), stream);
 427         }
 428       break;
 429     case TYPE_CODE_STRUCT:
 430       java_print_value_fields (type, valaddr, address, stream, format,
 431                                recurse, pretty);
 432       break;
 433     default:
 434       return c_val_print (type, valaddr, address, stream, format,
 435                           deref_ref, recurse, pretty);
 436     }
 437 }