gdb/m2-valprint.c

   1 /* Support for printing Modula 2 values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986, 1988, 1989, 1991, 1992, 1996, 1998, 2000, 2005, 2006,
   4                  2007, 2008 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "expression.h"
  25 #include "value.h"
  26 #include "valprint.h"
  27 #include "language.h"
  28 #include "typeprint.h"
  29 #include "c-lang.h"
  30 #include "m2-lang.h"
  31 #include "target.h"
  32
  33 int print_unpacked_pointer (struct type *type,
  34                             CORE_ADDR address, CORE_ADDR addr,
  35                             int format, struct ui_file *stream);
  36 static void
  37 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
  38                          int embedded_offset, CORE_ADDR address,
  39                          struct ui_file *stream, int format,
  40                          enum val_prettyprint pretty,
  41                          int deref_ref, int recurse, int len);
  42
  43
  44 /* Print function pointer with inferior address ADDRESS onto stdio
  45    stream STREAM.  */
  46
  47 static void
  48 print_function_pointer_address (CORE_ADDR address, struct ui_file *stream)
  49 {
  50   CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
  51                                                             address,
  52                                                             &current_target);
  53
  54   /* If the function pointer is represented by a description, print the
  55      address of the description.  */
  56   if (addressprint && func_addr != address)
  57     {
  58       fputs_filtered ("@", stream);
  59       fputs_filtered (paddress (address), stream);
  60       fputs_filtered (": ", stream);
  61     }
  62   print_address_demangle (func_addr, stream, demangle);
  63 }
  64
  65 /* get_long_set_bounds - assigns the bounds of the long set to low and
  66                          high.  */
  67
  68 int
  69 get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
  70 {
  71   int len, i;
  72
  73   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
  74     {
  75       len = TYPE_NFIELDS (type);
  76       i = TYPE_N_BASECLASSES (type);
  77       if (len == 0)
  78         return 0;
  79       *low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
  80       *high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
  81                                                                  len-1)));
  82       return 1;
  83     }
  84   error (_("expecting long_set"));
  85   return 0;
  86 }
  87
  88 static void
  89 m2_print_long_set (struct type *type, const gdb_byte *valaddr,
  90                    int embedded_offset, CORE_ADDR address,
  91                    struct ui_file *stream, int format,
  92                    enum val_prettyprint pretty)
  93 {
  94   int empty_set        = 1;
  95   int element_seen     = 0;
  96   LONGEST previous_low = 0;
  97   LONGEST previous_high= 0;
  98   LONGEST i, low_bound, high_bound;
  99   LONGEST field_low, field_high;
 100   struct type *range;
 101   int len, field;
 102   struct type *target;
 103   int bitval;
 104
 105   CHECK_TYPEDEF (type);
 106
 107   fprintf_filtered (stream, "{");
 108   len = TYPE_NFIELDS (type);
 109   if (get_long_set_bounds (type, &low_bound, &high_bound))
 110     {
 111       field = TYPE_N_BASECLASSES (type);
 112       range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 113     }
 114   else
 115     {
 116       fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
 117       return;
 118     }
 119
 120   target = TYPE_TARGET_TYPE (range);
 121   if (target == NULL)
 122     target = builtin_type_int;
 123
 124   if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
 125     {
 126       for (i = low_bound; i <= high_bound; i++)
 127         {
 128           bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
 129                                     (TYPE_FIELD_BITPOS (type, field) / 8) +
 130                                     valaddr + embedded_offset, i);
 131           if (bitval < 0)
 132             error (_("bit test is out of range"));
 133           else if (bitval > 0)
 134             {
 135               previous_high = i;
 136               if (! element_seen)
 137                 {
 138                   if (! empty_set)
 139                     fprintf_filtered (stream, ", ");
 140                   print_type_scalar (target, i, stream);
 141                   empty_set    = 0;
 142                   element_seen = 1;
 143                   previous_low = i;
 144                 }
 145             }
 146           else
 147             {
 148               /* bit is not set */
 149               if (element_seen)
 150                 {
 151                   if (previous_low+1 < previous_high)
 152                     fprintf_filtered (stream, "..");
 153                   if (previous_low+1 < previous_high)
 154                     print_type_scalar (target, previous_high, stream);
 155                   element_seen = 0;
 156                 }
 157             }
 158           if (i == field_high)
 159             {
 160               field++;
 161               if (field == len)
 162                 break;
 163               range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 164               if (get_discrete_bounds (range, &field_low, &field_high) < 0)
 165                 break;
 166               target = TYPE_TARGET_TYPE (range);
 167               if (target == NULL)
 168                 target = builtin_type_int;
 169             }
 170         }
 171       if (element_seen)
 172         {
 173           if (previous_low+1 < previous_high)
 174             {
 175               fprintf_filtered (stream, "..");
 176               print_type_scalar (target, previous_high, stream);
 177             }
 178           element_seen = 0;
 179         }
 180       fprintf_filtered (stream, "}");
 181     }
 182 }
 183
 184 static void
 185 m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
 186                           int embedded_offset, CORE_ADDR address,
 187                           struct ui_file *stream, int format,
 188                           int deref_ref, enum val_prettyprint pretty,
 189                           int recurse)
 190 {
 191   struct type *content_type;
 192   CORE_ADDR addr;
 193   LONGEST len;
 194   struct value *val;
 195
 196   CHECK_TYPEDEF (type);
 197   content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
 198
 199   addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
 200                          (TYPE_FIELD_BITPOS (type, 0) / 8) +
 201                          valaddr + embedded_offset);
 202
 203   val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
 204                        addr);
 205   len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
 206
 207   fprintf_filtered (stream, "{");
 208   m2_print_array_contents (value_type (val), value_contents(val),
 209                            value_embedded_offset (val), addr, stream,
 210                            format, deref_ref, pretty, recurse, len);
 211   fprintf_filtered (stream, ", HIGH = %d}", (int) len);
 212 }
 213
 214 int
 215 print_unpacked_pointer (struct type *type,
 216                         CORE_ADDR address, CORE_ADDR addr,
 217                         int format, struct ui_file *stream)
 218 {
 219   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 220
 221   if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 222     {
 223       /* Try to print what function it points to.  */
 224       print_function_pointer_address (addr, stream);
 225       /* Return value is irrelevant except for string pointers.  */
 226       return 0;
 227     }
 228
 229   if (addressprint && format != 's')
 230     fputs_filtered (paddress (address), stream);
 231
 232   /* For a pointer to char or unsigned char, also print the string
 233      pointed to, unless pointer is null.  */
 234
 235   if (TYPE_LENGTH (elttype) == 1
 236       && TYPE_CODE (elttype) == TYPE_CODE_INT
 237       && (format == 0 || format == 's')
 238       && addr != 0)
 239       return val_print_string (addr, -1, TYPE_LENGTH (elttype), stream);
 240
 241   return 0;
 242 }
 243
 244 static void
 245 print_variable_at_address (struct type *type,
 246                            const gdb_byte *valaddr,
 247                            struct ui_file *stream, int format,
 248                            int deref_ref, int recurse,
 249                            enum val_prettyprint pretty)
 250 {
 251   CORE_ADDR addr = unpack_pointer (type, valaddr);
 252   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 253
 254   fprintf_filtered (stream, "[");
 255   fputs_filtered (paddress (addr), stream);
 256   fprintf_filtered (stream, "] : ");
 257
 258   if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 259     {
 260       struct value *deref_val =
 261         value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
 262       common_val_print (deref_val, stream, format, deref_ref,
 263                         recurse, pretty, current_language);
 264     }
 265   else
 266     fputs_filtered ("???", stream);
 267 }
 268
 269
 270 /* m2_print_array_contents - prints out the contents of an
 271                              array up to a max_print values.
 272                              It prints arrays of char as a string
 273                              and all other data types as comma
 274                              separated values.  */
 275
 276 static void
 277 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
 278                          int embedded_offset, CORE_ADDR address,
 279                          struct ui_file *stream, int format,
 280                          enum val_prettyprint pretty,
 281                          int deref_ref, int recurse, int len)
 282 {
 283   int eltlen;
 284   CHECK_TYPEDEF (type);
 285
 286   if (TYPE_LENGTH (type) > 0)
 287     {
 288       eltlen = TYPE_LENGTH (type);
 289       if (prettyprint_arrays)
 290         print_spaces_filtered (2 + 2 * recurse, stream);
 291       /* For an array of chars, print with string syntax.  */
 292       if (eltlen == 1 &&
 293           ((TYPE_CODE (type) == TYPE_CODE_INT)
 294            || ((current_language->la_language == language_m2)
 295                && (TYPE_CODE (type) == TYPE_CODE_CHAR)))
 296           && (format == 0 || format == 's'))
 297         val_print_string (address, len+1, eltlen, stream);
 298       else
 299         {
 300           fprintf_filtered (stream, "{");
 301           val_print_array_elements (type, valaddr + embedded_offset,
 302                                     address, stream, format,
 303                                     deref_ref, recurse, pretty, 0);
 304           fprintf_filtered (stream, "}");
 305         }
 306     }
 307 }
 308
 309
 310 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 311    the inferior at address ADDRESS, onto stdio stream STREAM according to
 312    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
 313    target byte order.
 314
 315    If the data are a string pointer, returns the number of string characters
 316    printed.
 317
 318    If DEREF_REF is nonzero, then dereference references, otherwise just print
 319    them like pointers.
 320
 321    The PRETTY parameter controls prettyprinting.  */
 322
 323 int
 324 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 325               CORE_ADDR address, struct ui_file *stream, int format,
 326               int deref_ref, int recurse, enum val_prettyprint pretty)
 327 {
 328   unsigned int i = 0;   /* Number of characters printed */
 329   unsigned len;
 330   struct type *elttype;
 331   unsigned eltlen;
 332   int length_pos, length_size, string_pos;
 333   int char_size;
 334   LONGEST val;
 335   CORE_ADDR addr;
 336
 337   CHECK_TYPEDEF (type);
 338   switch (TYPE_CODE (type))
 339     {
 340     case TYPE_CODE_ARRAY:
 341       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 342         {
 343           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 344           eltlen = TYPE_LENGTH (elttype);
 345           len = TYPE_LENGTH (type) / eltlen;
 346           if (prettyprint_arrays)
 347             print_spaces_filtered (2 + 2 * recurse, stream);
 348           /* For an array of chars, print with string syntax.  */
 349           if (eltlen == 1 &&
 350               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 351                || ((current_language->la_language == language_m2)
 352                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 353               && (format == 0 || format == 's'))
 354             {
 355               /* If requested, look for the first null char and only print
 356                  elements up to it.  */
 357               if (stop_print_at_null)
 358                 {
 359                   unsigned int temp_len;
 360
 361                   /* Look for a NULL char. */
 362                   for (temp_len = 0;
 363                        (valaddr + embedded_offset)[temp_len]
 364                          && temp_len < len && temp_len < print_max;
 365                        temp_len++);
 366                   len = temp_len;
 367                 }
 368
 369               LA_PRINT_STRING (stream, valaddr + embedded_offset, len, 1, 0);
 370               i = len;
 371             }
 372           else
 373             {
 374               fprintf_filtered (stream, "{");
 375               val_print_array_elements (type, valaddr + embedded_offset,
 376                                         address, stream, format, deref_ref,
 377                                         recurse, pretty, 0);
 378               fprintf_filtered (stream, "}");
 379             }
 380           break;
 381         }
 382       /* Array of unspecified length: treat like pointer to first elt.  */
 383       print_unpacked_pointer (type, address, address, format, stream);
 384       break;
 385
 386     case TYPE_CODE_PTR:
 387       if (TYPE_CONST (type))
 388         print_variable_at_address (type, valaddr + embedded_offset,
 389                                    stream, format, deref_ref, recurse,
 390                                    pretty);
 391       else if (format && format != 's')
 392         print_scalar_formatted (valaddr + embedded_offset, type, format,
 393                                 0, stream);
 394       else
 395         {
 396           addr = unpack_pointer (type, valaddr + embedded_offset);
 397           print_unpacked_pointer (type, addr, address, format, stream);
 398         }
 399       break;
 400
 401     case TYPE_CODE_REF:
 402       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 403       if (addressprint)
 404         {
 405           CORE_ADDR addr
 406             = extract_typed_address (valaddr + embedded_offset, type);
 407           fprintf_filtered (stream, "@");
 408           fputs_filtered (paddress (addr), stream);
 409           if (deref_ref)
 410             fputs_filtered (": ", stream);
 411         }
 412       /* De-reference the reference.  */
 413       if (deref_ref)
 414         {
 415           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 416             {
 417               struct value *deref_val =
 418                 value_at
 419                 (TYPE_TARGET_TYPE (type),
 420                  unpack_pointer (type, valaddr + embedded_offset));
 421               common_val_print (deref_val, stream, format, deref_ref,
 422                                 recurse, pretty, current_language);
 423             }
 424           else
 425             fputs_filtered ("???", stream);
 426         }
 427       break;
 428
 429     case TYPE_CODE_UNION:
 430       if (recurse && !unionprint)
 431         {
 432           fprintf_filtered (stream, "{...}");
 433           break;
 434         }
 435       /* Fall through.  */
 436     case TYPE_CODE_STRUCT:
 437       if (m2_is_long_set (type))
 438         m2_print_long_set (type, valaddr, embedded_offset, address,
 439                            stream, format, pretty);
 440       else if (m2_is_unbounded_array (type))
 441         m2_print_unbounded_array (type, valaddr, embedded_offset,
 442                                   address, stream, format, deref_ref,
 443                                   pretty, recurse);
 444       else
 445         cp_print_value_fields (type, type, valaddr, embedded_offset,
 446                                address, stream, format,
 447                                recurse, pretty, NULL, 0);
 448       break;
 449
 450     case TYPE_CODE_ENUM:
 451       if (format)
 452         {
 453           print_scalar_formatted (valaddr + embedded_offset, type,
 454                                   format, 0, stream);
 455           break;
 456         }
 457       len = TYPE_NFIELDS (type);
 458       val = unpack_long (type, valaddr + embedded_offset);
 459       for (i = 0; i < len; i++)
 460         {
 461           QUIT;
 462           if (val == TYPE_FIELD_BITPOS (type, i))
 463             {
 464               break;
 465             }
 466         }
 467       if (i < len)
 468         {
 469           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 470         }
 471       else
 472         {
 473           print_longest (stream, 'd', 0, val);
 474         }
 475       break;
 476
 477     case TYPE_CODE_FUNC:
 478       if (format)
 479         {
 480           print_scalar_formatted (valaddr + embedded_offset, type,
 481                                   format, 0, stream);
 482           break;
 483         }
 484       /* FIXME, we should consider, at least for ANSI C language, eliminating
 485          the distinction made between FUNCs and POINTERs to FUNCs.  */
 486       fprintf_filtered (stream, "{");
 487       type_print (type, "", stream, -1);
 488       fprintf_filtered (stream, "} ");
 489       /* Try to print what function it points to, and its address.  */
 490       print_address_demangle (address, stream, demangle);
 491       break;
 492
 493     case TYPE_CODE_BOOL:
 494       format = format ? format : output_format;
 495       if (format)
 496         print_scalar_formatted (valaddr + embedded_offset, type,
 497                                 format, 0, stream);
 498       else
 499         {
 500           val = unpack_long (type, valaddr + embedded_offset);
 501           if (val == 0)
 502             fputs_filtered ("FALSE", stream);
 503           else if (val == 1)
 504             fputs_filtered ("TRUE", stream);
 505           else
 506             fprintf_filtered (stream, "%ld)", (long int) val);
 507         }
 508       break;
 509
 510     case TYPE_CODE_RANGE:
 511       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 512         {
 513           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 514                         address, stream, format, deref_ref, recurse, pretty);
 515           break;
 516         }
 517       /* FIXME: create_range_type does not set the unsigned bit in a
 518          range type (I think it probably should copy it from the target
 519          type), so we won't print values which are too large to
 520          fit in a signed integer correctly.  */
 521       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 522          print with the target type, though, because the size of our type
 523          and the target type might differ).  */
 524       /* FALLTHROUGH */
 525
 526     case TYPE_CODE_INT:
 527       format = format ? format : output_format;
 528       if (format)
 529         print_scalar_formatted (valaddr + embedded_offset, type, format,
 530                                 0, stream);
 531       else
 532         val_print_type_code_int (type, valaddr + embedded_offset, stream);
 533       break;
 534
 535     case TYPE_CODE_CHAR:
 536       format = format ? format : output_format;
 537       if (format)
 538         print_scalar_formatted (valaddr + embedded_offset, type,
 539                                 format, 0, stream);
 540       else
 541         {
 542           val = unpack_long (type, valaddr + embedded_offset);
 543           if (TYPE_UNSIGNED (type))
 544             fprintf_filtered (stream, "%u", (unsigned int) val);
 545           else
 546             fprintf_filtered (stream, "%d", (int) val);
 547           fputs_filtered (" ", stream);
 548           LA_PRINT_CHAR ((unsigned char) val, stream);
 549         }
 550       break;
 551
 552     case TYPE_CODE_FLT:
 553       if (format)
 554         print_scalar_formatted (valaddr + embedded_offset, type,
 555                                 format, 0, stream);
 556       else
 557         print_floating (valaddr + embedded_offset, type, stream);
 558       break;
 559
 560     case TYPE_CODE_METHOD:
 561       break;
 562
 563     case TYPE_CODE_BITSTRING:
 564     case TYPE_CODE_SET:
 565       elttype = TYPE_INDEX_TYPE (type);
 566       CHECK_TYPEDEF (elttype);
 567       if (TYPE_STUB (elttype))
 568         {
 569           fprintf_filtered (stream, _("<incomplete type>"));
 570           gdb_flush (stream);
 571           break;
 572         }
 573       else
 574         {
 575           struct type *range = elttype;
 576           LONGEST low_bound, high_bound;
 577           int i;
 578           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 579           int need_comma = 0;
 580
 581           if (is_bitstring)
 582             fputs_filtered ("B'", stream);
 583           else
 584             fputs_filtered ("{", stream);
 585
 586           i = get_discrete_bounds (range, &low_bound, &high_bound);
 587         maybe_bad_bstring:
 588           if (i < 0)
 589             {
 590               fputs_filtered (_("<error value>"), stream);
 591               goto done;
 592             }
 593
 594           for (i = low_bound; i <= high_bound; i++)
 595             {
 596               int element = value_bit_index (type, valaddr + embedded_offset,
 597                                              i);
 598               if (element < 0)
 599                 {
 600                   i = element;
 601                   goto maybe_bad_bstring;
 602                 }
 603               if (is_bitstring)
 604                 fprintf_filtered (stream, "%d", element);
 605               else if (element)
 606                 {
 607                   if (need_comma)
 608                     fputs_filtered (", ", stream);
 609                   print_type_scalar (range, i, stream);
 610                   need_comma = 1;
 611
 612                   if (i + 1 <= high_bound
 613                       && value_bit_index (type, valaddr + embedded_offset,
 614                                           ++i))
 615                     {
 616                       int j = i;
 617                       fputs_filtered ("..", stream);
 618                       while (i + 1 <= high_bound
 619                              && value_bit_index (type,
 620                                                  valaddr + embedded_offset,
 621                                                  ++i))
 622                         j = i;
 623                       print_type_scalar (range, j, stream);
 624                     }
 625                 }
 626             }
 627         done:
 628           if (is_bitstring)
 629             fputs_filtered ("'", stream);
 630           else
 631             fputs_filtered ("}", stream);
 632         }
 633       break;
 634
 635     case TYPE_CODE_VOID:
 636       fprintf_filtered (stream, "void");
 637       break;
 638
 639     case TYPE_CODE_ERROR:
 640       fprintf_filtered (stream, _("<error type>"));
 641       break;
 642
 643     case TYPE_CODE_UNDEF:
 644       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 645          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 646          and no complete type for struct foo in that file.  */
 647       fprintf_filtered (stream, _("<incomplete type>"));
 648       break;
 649
 650     default:
 651       error (_("Invalid m2 type code %d in symbol table."), TYPE_CODE (type));
 652     }
 653   gdb_flush (stream);
 654   return (0);
 655 }