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 (value_ptr 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, next_element;
  94
  95           address += JAVA_OBJECT_SIZE + 4;      /* Skip object header and length. */
  96
  97           while (i < length && things_printed < print_max)
  98             {
  99               char *buf;
 100
 101               buf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT);
 102               fputs_filtered (", ", stream);
 103               wrap_here (n_spaces (2));
 104
 105               if (i > 0)
 106                 element = next_element;
 107               else
 108                 {
 109                   read_memory (address, buf, sizeof (buf));
 110                   address += TARGET_PTR_BIT / HOST_CHAR_BIT;
 111                   element = extract_address (buf, sizeof (buf));
 112                 }
 113
 114               for (reps = 1; i + reps < length; reps++)
 115                 {
 116                   read_memory (address, buf, sizeof (buf));
 117                   address += TARGET_PTR_BIT / HOST_CHAR_BIT;
 118                   next_element = extract_address (buf, sizeof (buf));
 119                   if (next_element != element)
 120                     break;
 121                 }
 122
 123               if (reps == 1)
 124                 fprintf_filtered (stream, "%d: ", i);
 125               else
 126                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 127
 128               if (element == 0)
 129                 fprintf_filtered (stream, "null");
 130               else
 131                 fprintf_filtered (stream, "@%s", paddr_nz (element));
 132
 133               things_printed++;
 134               i += reps;
 135             }
 136         }
 137       else
 138         {
 139           value_ptr v = allocate_value (el_type);
 140           value_ptr next_v = allocate_value (el_type);
 141
 142           VALUE_ADDRESS (v) = address + JAVA_OBJECT_SIZE + 4;
 143           VALUE_ADDRESS (next_v) = VALUE_ADDRESS (v);
 144
 145           while (i < length && things_printed < print_max)
 146             {
 147               fputs_filtered (", ", stream);
 148               wrap_here (n_spaces (2));
 149
 150               if (i > 0)
 151                 {
 152                   value_ptr tmp;
 153
 154                   tmp = next_v;
 155                   next_v = v;
 156                   v = tmp;
 157                 }
 158               else
 159                 {
 160                   VALUE_LAZY (v) = 1;
 161                   VALUE_OFFSET (v) = 0;
 162                 }
 163
 164               VALUE_OFFSET (next_v) = VALUE_OFFSET (v);
 165
 166               for (reps = 1; i + reps < length; reps++)
 167                 {
 168                   VALUE_LAZY (next_v) = 1;
 169                   VALUE_OFFSET (next_v) += TYPE_LENGTH (el_type);
 170                   if (memcmp (VALUE_CONTENTS (v), VALUE_CONTENTS (next_v),
 171                               TYPE_LENGTH (el_type)) != 0)
 172                     break;
 173                 }
 174
 175               if (reps == 1)
 176                 fprintf_filtered (stream, "%d: ", i);
 177               else
 178                 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
 179
 180               val_print (VALUE_TYPE (v), VALUE_CONTENTS (v), 0, 0,
 181                          stream, format, 2, 1, pretty);
 182
 183               things_printed++;
 184               i += reps;
 185             }
 186         }
 187
 188       if (i < length)
 189         fprintf_filtered (stream, "...");
 190
 191       fprintf_filtered (stream, "}");
 192
 193       return 0;
 194     }
 195
 196   /* If it's type String, print it */
 197
 198   if (TYPE_CODE (type) == TYPE_CODE_PTR
 199       && TYPE_TARGET_TYPE (type)
 200       && TYPE_NAME (TYPE_TARGET_TYPE (type))
 201       && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "java.lang.String") == 0
 202       && (format == 0 || format == 's')
 203       && address != 0
 204       && value_as_pointer (val) != 0)
 205     {
 206       value_ptr data_val;
 207       CORE_ADDR data;
 208       value_ptr boffset_val;
 209       unsigned long boffset;
 210       value_ptr count_val;
 211       unsigned long count;
 212       value_ptr mark;
 213
 214       mark = value_mark ();     /* Remember start of new values */
 215
 216       data_val = value_struct_elt (&val, NULL, "data", NULL, NULL);
 217       data = value_as_pointer (data_val);
 218
 219       boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL);
 220       boffset = value_as_pointer (boffset_val);
 221
 222       count_val = value_struct_elt (&val, NULL, "count", NULL, NULL);
 223       count = value_as_pointer (count_val);
 224
 225       value_free_to_mark (mark);        /* Release unnecessary values */
 226
 227       val_print_string (data + boffset, count, 2, stream);
 228
 229       return 0;
 230     }
 231
 232   return (val_print (type, VALUE_CONTENTS (val), 0, address,
 233                      stream, format, 1, 0, pretty));
 234 }
 235
 236 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
 237    same meanings as in cp_print_value and c_val_print.
 238
 239    DONT_PRINT is an array of baseclass types that we
 240    should not print, or zero if called from top level.  */
 241
 242 static void
 243 java_print_value_fields (struct type *type, char *valaddr, CORE_ADDR address,
 244                          struct ui_file *stream, int format, int recurse,
 245                          enum val_prettyprint pretty)
 246 {
 247   int i, len, n_baseclasses;
 248
 249   CHECK_TYPEDEF (type);
 250
 251   fprintf_filtered (stream, "{");
 252   len = TYPE_NFIELDS (type);
 253   n_baseclasses = TYPE_N_BASECLASSES (type);
 254
 255   if (n_baseclasses > 0)
 256     {
 257       int i, n_baseclasses = TYPE_N_BASECLASSES (type);
 258
 259       for (i = 0; i < n_baseclasses; i++)
 260         {
 261           int boffset;
 262           struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
 263           char *basename = TYPE_NAME (baseclass);
 264           char *base_valaddr;
 265
 266           if (BASETYPE_VIA_VIRTUAL (type, i))
 267             continue;
 268
 269           if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
 270             continue;
 271
 272           boffset = 0;
 273
 274           if (pretty)
 275             {
 276               fprintf_filtered (stream, "\n");
 277               print_spaces_filtered (2 * (recurse + 1), stream);
 278             }
 279           fputs_filtered ("<", stream);
 280           /* Not sure what the best notation is in the case where there is no
 281              baseclass name.  */
 282           fputs_filtered (basename ? basename : "", stream);
 283           fputs_filtered ("> = ", stream);
 284
 285           base_valaddr = valaddr;
 286
 287           java_print_value_fields (baseclass, base_valaddr, address + boffset,
 288                                    stream, format, recurse + 1, pretty);
 289           fputs_filtered (", ", stream);
 290
 291         flush_it:
 292           ;
 293         }
 294
 295     }
 296
 297   if (!len && n_baseclasses == 1)
 298     fprintf_filtered (stream, "<No data fields>");
 299   else
 300     {
 301       extern int inspect_it;
 302       int fields_seen = 0;
 303
 304       for (i = n_baseclasses; i < len; i++)
 305         {
 306           /* If requested, skip printing of static fields.  */
 307           if (TYPE_FIELD_STATIC (type, i))
 308             {
 309               char *name = TYPE_FIELD_NAME (type, i);
 310               if (!static_field_print)
 311                 continue;
 312               if (name != NULL && strcmp (name, "class") == 0)
 313                 continue;
 314             }
 315           if (fields_seen)
 316             fprintf_filtered (stream, ", ");
 317           else if (n_baseclasses > 0)
 318             {
 319               if (pretty)
 320                 {
 321                   fprintf_filtered (stream, "\n");
 322                   print_spaces_filtered (2 + 2 * recurse, stream);
 323                   fputs_filtered ("members of ", stream);
 324                   fputs_filtered (type_name_no_tag (type), stream);
 325                   fputs_filtered (": ", stream);
 326                 }
 327             }
 328           fields_seen = 1;
 329
 330           if (pretty)
 331             {
 332               fprintf_filtered (stream, "\n");
 333               print_spaces_filtered (2 + 2 * recurse, stream);
 334             }
 335           else
 336             {
 337               wrap_here (n_spaces (2 + 2 * recurse));
 338             }
 339           if (inspect_it)
 340             {
 341               if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
 342                 fputs_filtered ("\"( ptr \"", stream);
 343               else
 344                 fputs_filtered ("\"( nodef \"", stream);
 345               if (TYPE_FIELD_STATIC (type, i))
 346                 fputs_filtered ("static ", stream);
 347               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 348                                        language_cplus,
 349                                        DMGL_PARAMS | DMGL_ANSI);
 350               fputs_filtered ("\" \"", stream);
 351               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 352                                        language_cplus,
 353                                        DMGL_PARAMS | DMGL_ANSI);
 354               fputs_filtered ("\") \"", stream);
 355             }
 356           else
 357             {
 358               annotate_field_begin (TYPE_FIELD_TYPE (type, i));
 359
 360               if (TYPE_FIELD_STATIC (type, i))
 361                 fputs_filtered ("static ", stream);
 362               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 363                                        language_cplus,
 364                                        DMGL_PARAMS | DMGL_ANSI);
 365               annotate_field_name_end ();
 366               fputs_filtered (": ", stream);
 367               annotate_field_value ();
 368             }
 369
 370           if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
 371             {
 372               value_ptr v;
 373
 374               /* Bitfields require special handling, especially due to byte
 375                  order problems.  */
 376               if (TYPE_FIELD_IGNORE (type, i))
 377                 {
 378                   fputs_filtered ("<optimized out or zero length>", stream);
 379                 }
 380               else
 381                 {
 382                   v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 383                                    unpack_field_as_long (type, valaddr, i));
 384
 385                   val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 386                              0, stream, format, 0, recurse + 1, pretty);
 387                 }
 388             }
 389           else
 390             {
 391               if (TYPE_FIELD_IGNORE (type, i))
 392                 {
 393                   fputs_filtered ("<optimized out or zero length>", stream);
 394                 }
 395               else if (TYPE_FIELD_STATIC (type, i))
 396                 {
 397                   value_ptr v = value_static_field (type, i);
 398                   if (v == NULL)
 399                     fputs_filtered ("<optimized out>", stream);
 400                   else
 401                     {
 402                       struct type *t = check_typedef (VALUE_TYPE (v));
 403                       if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
 404                         v = value_addr (v);
 405                       val_print (VALUE_TYPE (v),
 406                                  VALUE_CONTENTS (v), 0, VALUE_ADDRESS (v),
 407                                  stream, format, 0, recurse + 1, pretty);
 408                     }
 409                 }
 410               else if (TYPE_FIELD_TYPE (type, i) == NULL)
 411                 fputs_filtered ("<unknown type>", stream);
 412               else
 413                 {
 414                   val_print (TYPE_FIELD_TYPE (type, i),
 415                              valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0,
 416                              address + TYPE_FIELD_BITPOS (type, i) / 8,
 417                              stream, format, 0, recurse + 1, pretty);
 418                 }
 419             }
 420           annotate_field_end ();
 421         }
 422
 423       if (pretty)
 424         {
 425           fprintf_filtered (stream, "\n");
 426           print_spaces_filtered (2 * recurse, stream);
 427         }
 428     }
 429   fprintf_filtered (stream, "}");
 430 }
 431
 432 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 433    the inferior at address ADDRESS, onto stdio stream STREAM according to
 434    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
 435    target byte order.
 436
 437    If the data are a string pointer, returns the number of string characters
 438    printed.
 439
 440    If DEREF_REF is nonzero, then dereference references, otherwise just print
 441    them like pointers.
 442
 443    The PRETTY parameter controls prettyprinting.  */
 444
 445 int
 446 java_val_print (struct type *type, char *valaddr, int embedded_offset,
 447                 CORE_ADDR address, struct ui_file *stream, int format,
 448                 int deref_ref, int recurse, enum val_prettyprint pretty)
 449 {
 450   register unsigned int i = 0;  /* Number of characters printed */
 451   struct type *target_type;
 452   CORE_ADDR addr;
 453
 454   CHECK_TYPEDEF (type);
 455   switch (TYPE_CODE (type))
 456     {
 457     case TYPE_CODE_PTR:
 458       if (format && format != 's')
 459         {
 460           print_scalar_formatted (valaddr, type, format, 0, stream);
 461           break;
 462         }
 463 #if 0
 464       if (vtblprint && cp_is_vtbl_ptr_type (type))
 465         {
 466           /* Print the unmangled name if desired.  */
 467           /* Print vtable entry - we only get here if we ARE using
 468              -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */
 469           print_address_demangle (extract_address (valaddr, TYPE_LENGTH (type)),
 470                                   stream, demangle);
 471           break;
 472         }
 473 #endif
 474       addr = unpack_pointer (type, valaddr);
 475       if (addr == 0)
 476         {
 477           fputs_filtered ("null", stream);
 478           return i;
 479         }
 480       target_type = check_typedef (TYPE_TARGET_TYPE (type));
 481
 482       if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)
 483         {
 484           /* Try to print what function it points to.  */
 485           print_address_demangle (addr, stream, demangle);
 486           /* Return value is irrelevant except for string pointers.  */
 487           return (0);
 488         }
 489
 490       if (addressprint && format != 's')
 491         {
 492           fputs_filtered ("@", stream);
 493           print_longest (stream, 'x', 0, (ULONGEST) addr);
 494         }
 495
 496       return i;
 497
 498     case TYPE_CODE_CHAR:
 499       format = format ? format : output_format;
 500       if (format)
 501         print_scalar_formatted (valaddr, type, format, 0, stream);
 502       else
 503         LA_PRINT_CHAR ((int) unpack_long (type, valaddr), stream);
 504       break;
 505
 506     case TYPE_CODE_INT:
 507       /* Can't just call c_val_print because that print bytes as C chars. */
 508       format = format ? format : output_format;
 509       if (format)
 510         print_scalar_formatted (valaddr, type, format, 0, stream);
 511       else
 512         val_print_type_code_int (type, valaddr, stream);
 513       break;
 514
 515     case TYPE_CODE_STRUCT:
 516       java_print_value_fields (type, valaddr, address, stream, format,
 517                                recurse, pretty);
 518       break;
 519
 520     default:
 521       return c_val_print (type, valaddr, embedded_offset, address, stream,
 522                           format, deref_ref, recurse, pretty);
 523     }
 524
 525   return 0;
 526 }