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