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
 262         (TYPE_TARGET_TYPE (type),
 263          unpack_pointer (lookup_pointer_type (builtin_type_void),
 264                          valaddr));
 265       common_val_print (deref_val, stream, format, deref_ref,
 266                         recurse, pretty);
 267     }
 268   else
 269     fputs_filtered ("???", stream);
 270 }
 271
 272
 273 /* m2_print_array_contents - prints out the contents of an
 274                              array up to a max_print values.
 275                              It prints arrays of char as a string
 276                              and all other data types as comma
 277                              separated values.  */
 278
 279 static void
 280 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
 281                          int embedded_offset, CORE_ADDR address,
 282                          struct ui_file *stream, int format,
 283                          enum val_prettyprint pretty,
 284                          int deref_ref, int recurse, int len)
 285 {
 286   int eltlen;
 287   CHECK_TYPEDEF (type);
 288
 289   if (TYPE_LENGTH (type) > 0)
 290     {
 291       eltlen = TYPE_LENGTH (type);
 292       if (prettyprint_arrays)
 293         print_spaces_filtered (2 + 2 * recurse, stream);
 294       /* For an array of chars, print with string syntax.  */
 295       if (eltlen == 1 &&
 296           ((TYPE_CODE (type) == TYPE_CODE_INT)
 297            || ((current_language->la_language == language_m2)
 298                && (TYPE_CODE (type) == TYPE_CODE_CHAR)))
 299           && (format == 0 || format == 's'))
 300         val_print_string (address, len+1, eltlen, stream);
 301       else
 302         {
 303           fprintf_filtered (stream, "{");
 304           val_print_array_elements (type, valaddr + embedded_offset,
 305                                     address, stream, format,
 306                                     deref_ref, recurse, pretty, 0);
 307           fprintf_filtered (stream, "}");
 308         }
 309     }
 310 }
 311
 312
 313 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 314    the inferior at address ADDRESS, onto stdio stream STREAM according to
 315    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
 316    target byte order.
 317
 318    If the data are a string pointer, returns the number of string characters
 319    printed.
 320
 321    If DEREF_REF is nonzero, then dereference references, otherwise just print
 322    them like pointers.
 323
 324    The PRETTY parameter controls prettyprinting.  */
 325
 326 int
 327 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 328               CORE_ADDR address, struct ui_file *stream, int format,
 329               int deref_ref, int recurse, enum val_prettyprint pretty)
 330 {
 331   unsigned int i = 0;   /* Number of characters printed */
 332   unsigned len;
 333   struct type *elttype;
 334   unsigned eltlen;
 335   int length_pos, length_size, string_pos;
 336   int char_size;
 337   LONGEST val;
 338   CORE_ADDR addr;
 339
 340   CHECK_TYPEDEF (type);
 341   switch (TYPE_CODE (type))
 342     {
 343     case TYPE_CODE_ARRAY:
 344       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 345         {
 346           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 347           eltlen = TYPE_LENGTH (elttype);
 348           len = TYPE_LENGTH (type) / eltlen;
 349           if (prettyprint_arrays)
 350             print_spaces_filtered (2 + 2 * recurse, stream);
 351           /* For an array of chars, print with string syntax.  */
 352           if (eltlen == 1 &&
 353               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 354                || ((current_language->la_language == language_m2)
 355                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 356               && (format == 0 || format == 's'))
 357             {
 358               /* If requested, look for the first null char and only print
 359                  elements up to it.  */
 360               if (stop_print_at_null)
 361                 {
 362                   unsigned int temp_len;
 363
 364                   /* Look for a NULL char. */
 365                   for (temp_len = 0;
 366                        (valaddr + embedded_offset)[temp_len]
 367                          && temp_len < len && temp_len < print_max;
 368                        temp_len++);
 369                   len = temp_len;
 370                 }
 371
 372               LA_PRINT_STRING (stream, valaddr + embedded_offset, len, 1, 0);
 373               i = len;
 374             }
 375           else
 376             {
 377               fprintf_filtered (stream, "{");
 378               val_print_array_elements (type, valaddr + embedded_offset,
 379                                         address, stream, format, deref_ref,
 380                                         recurse, pretty, 0);
 381               fprintf_filtered (stream, "}");
 382             }
 383           break;
 384         }
 385       /* Array of unspecified length: treat like pointer to first elt.  */
 386       print_unpacked_pointer (type, address, address, format, stream);
 387       break;
 388
 389     case TYPE_CODE_PTR:
 390       if (TYPE_CONST (type))
 391         print_variable_at_address (type, valaddr + embedded_offset,
 392                                    stream, format, deref_ref, recurse,
 393                                    pretty);
 394       else if (format && format != 's')
 395         print_scalar_formatted (valaddr + embedded_offset, type, format,
 396                                 0, stream);
 397       else
 398         {
 399           addr = unpack_pointer (type, valaddr + embedded_offset);
 400           print_unpacked_pointer (type, addr, address, format, stream);
 401         }
 402       break;
 403
 404     case TYPE_CODE_REF:
 405       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 406       if (addressprint)
 407         {
 408           CORE_ADDR addr
 409             = extract_typed_address (valaddr + embedded_offset, type);
 410           fprintf_filtered (stream, "@");
 411           fputs_filtered (paddress (addr), stream);
 412           if (deref_ref)
 413             fputs_filtered (": ", stream);
 414         }
 415       /* De-reference the reference.  */
 416       if (deref_ref)
 417         {
 418           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 419             {
 420               struct value *deref_val =
 421                 value_at
 422                 (TYPE_TARGET_TYPE (type),
 423                  unpack_pointer (lookup_pointer_type (builtin_type_void),
 424                                  valaddr + embedded_offset));
 425               common_val_print (deref_val, stream, format, deref_ref,
 426                                 recurse, pretty);
 427             }
 428           else
 429             fputs_filtered ("???", stream);
 430         }
 431       break;
 432
 433     case TYPE_CODE_UNION:
 434       if (recurse && !unionprint)
 435         {
 436           fprintf_filtered (stream, "{...}");
 437           break;
 438         }
 439       /* Fall through.  */
 440     case TYPE_CODE_STRUCT:
 441       if (m2_is_long_set (type))
 442         m2_print_long_set (type, valaddr, embedded_offset, address,
 443                            stream, format, pretty);
 444       else if (m2_is_unbounded_array (type))
 445         m2_print_unbounded_array (type, valaddr, embedded_offset,
 446                                   address, stream, format, deref_ref,
 447                                   pretty, recurse);
 448       else
 449         cp_print_value_fields (type, type, valaddr, embedded_offset,
 450                                address, stream, format,
 451                                recurse, pretty, NULL, 0);
 452       break;
 453
 454     case TYPE_CODE_ENUM:
 455       if (format)
 456         {
 457           print_scalar_formatted (valaddr + embedded_offset, type,
 458                                   format, 0, stream);
 459           break;
 460         }
 461       len = TYPE_NFIELDS (type);
 462       val = unpack_long (type, valaddr + embedded_offset);
 463       for (i = 0; i < len; i++)
 464         {
 465           QUIT;
 466           if (val == TYPE_FIELD_BITPOS (type, i))
 467             {
 468               break;
 469             }
 470         }
 471       if (i < len)
 472         {
 473           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 474         }
 475       else
 476         {
 477           print_longest (stream, 'd', 0, val);
 478         }
 479       break;
 480
 481     case TYPE_CODE_FUNC:
 482       if (format)
 483         {
 484           print_scalar_formatted (valaddr + embedded_offset, type,
 485                                   format, 0, stream);
 486           break;
 487         }
 488       /* FIXME, we should consider, at least for ANSI C language, eliminating
 489          the distinction made between FUNCs and POINTERs to FUNCs.  */
 490       fprintf_filtered (stream, "{");
 491       type_print (type, "", stream, -1);
 492       fprintf_filtered (stream, "} ");
 493       /* Try to print what function it points to, and its address.  */
 494       print_address_demangle (address, stream, demangle);
 495       break;
 496
 497     case TYPE_CODE_BOOL:
 498       format = format ? format : output_format;
 499       if (format)
 500         print_scalar_formatted (valaddr + embedded_offset, type,
 501                                 format, 0, stream);
 502       else
 503         {
 504           val = unpack_long (type, valaddr + embedded_offset);
 505           if (val == 0)
 506             fputs_filtered ("FALSE", stream);
 507           else if (val == 1)
 508             fputs_filtered ("TRUE", stream);
 509           else
 510             fprintf_filtered (stream, "%ld)", (long int) val);
 511         }
 512       break;
 513
 514     case TYPE_CODE_RANGE:
 515       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 516         {
 517           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 518                         address, stream, format, deref_ref, recurse, pretty);
 519           break;
 520         }
 521       /* FIXME: create_range_type does not set the unsigned bit in a
 522          range type (I think it probably should copy it from the target
 523          type), so we won't print values which are too large to
 524          fit in a signed integer correctly.  */
 525       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 526          print with the target type, though, because the size of our type
 527          and the target type might differ).  */
 528       /* FALLTHROUGH */
 529
 530     case TYPE_CODE_INT:
 531       format = format ? format : output_format;
 532       if (format)
 533         print_scalar_formatted (valaddr + embedded_offset, type, format,
 534                                 0, stream);
 535       else
 536         val_print_type_code_int (type, valaddr + embedded_offset, stream);
 537       break;
 538
 539     case TYPE_CODE_CHAR:
 540       format = format ? format : output_format;
 541       if (format)
 542         print_scalar_formatted (valaddr + embedded_offset, type,
 543                                 format, 0, stream);
 544       else
 545         {
 546           val = unpack_long (type, valaddr + embedded_offset);
 547           if (TYPE_UNSIGNED (type))
 548             fprintf_filtered (stream, "%u", (unsigned int) val);
 549           else
 550             fprintf_filtered (stream, "%d", (int) val);
 551           fputs_filtered (" ", stream);
 552           LA_PRINT_CHAR ((unsigned char) val, stream);
 553         }
 554       break;
 555
 556     case TYPE_CODE_FLT:
 557       if (format)
 558         print_scalar_formatted (valaddr + embedded_offset, type,
 559                                 format, 0, stream);
 560       else
 561         print_floating (valaddr + embedded_offset, type, stream);
 562       break;
 563
 564     case TYPE_CODE_METHOD:
 565       break;
 566
 567     case TYPE_CODE_BITSTRING:
 568     case TYPE_CODE_SET:
 569       elttype = TYPE_INDEX_TYPE (type);
 570       CHECK_TYPEDEF (elttype);
 571       if (TYPE_STUB (elttype))
 572         {
 573           fprintf_filtered (stream, _("<incomplete type>"));
 574           gdb_flush (stream);
 575           break;
 576         }
 577       else
 578         {
 579           struct type *range = elttype;
 580           LONGEST low_bound, high_bound;
 581           int i;
 582           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 583           int need_comma = 0;
 584
 585           if (is_bitstring)
 586             fputs_filtered ("B'", stream);
 587           else
 588             fputs_filtered ("{", stream);
 589
 590           i = get_discrete_bounds (range, &low_bound, &high_bound);
 591         maybe_bad_bstring:
 592           if (i < 0)
 593             {
 594               fputs_filtered (_("<error value>"), stream);
 595               goto done;
 596             }
 597
 598           for (i = low_bound; i <= high_bound; i++)
 599             {
 600               int element = value_bit_index (type, valaddr + embedded_offset,
 601                                              i);
 602               if (element < 0)
 603                 {
 604                   i = element;
 605                   goto maybe_bad_bstring;
 606                 }
 607               if (is_bitstring)
 608                 fprintf_filtered (stream, "%d", element);
 609               else if (element)
 610                 {
 611                   if (need_comma)
 612                     fputs_filtered (", ", stream);
 613                   print_type_scalar (range, i, stream);
 614                   need_comma = 1;
 615
 616                   if (i + 1 <= high_bound
 617                       && value_bit_index (type, valaddr + embedded_offset,
 618                                           ++i))
 619                     {
 620                       int j = i;
 621                       fputs_filtered ("..", stream);
 622                       while (i + 1 <= high_bound
 623                              && value_bit_index (type,
 624                                                  valaddr + embedded_offset,
 625                                                  ++i))
 626                         j = i;
 627                       print_type_scalar (range, j, stream);
 628                     }
 629                 }
 630             }
 631         done:
 632           if (is_bitstring)
 633             fputs_filtered ("'", stream);
 634           else
 635             fputs_filtered ("}", stream);
 636         }
 637       break;
 638
 639     case TYPE_CODE_VOID:
 640       fprintf_filtered (stream, "void");
 641       break;
 642
 643     case TYPE_CODE_ERROR:
 644       fprintf_filtered (stream, _("<error type>"));
 645       break;
 646
 647     case TYPE_CODE_UNDEF:
 648       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 649          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 650          and no complete type for struct foo in that file.  */
 651       fprintf_filtered (stream, _("<incomplete type>"));
 652       break;
 653
 654     default:
 655       error (_("Invalid m2 type code %d in symbol table."), TYPE_CODE (type));
 656     }
 657   gdb_flush (stream);
 658   return (0);
 659 }