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