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, 2005-2012
   4    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 static int print_unpacked_pointer (struct type *type,
  34                                    CORE_ADDR address, CORE_ADDR addr,
  35                                    const struct value_print_options *options,
  36                                    struct ui_file *stream);
  37 static void
  38 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
  39                          int embedded_offset, CORE_ADDR address,
  40                          struct ui_file *stream, int recurse,
  41                          const struct value *val,
  42                          const struct value_print_options *options,
  43                          int len);
  44
  45
  46 /* get_long_set_bounds - assigns the bounds of the long set to low and
  47                          high.  */
  48
  49 int
  50 get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
  51 {
  52   int len, i;
  53
  54   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
  55     {
  56       len = TYPE_NFIELDS (type);
  57       i = TYPE_N_BASECLASSES (type);
  58       if (len == 0)
  59         return 0;
  60       *low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
  61       *high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
  62                                                                  len-1)));
  63       return 1;
  64     }
  65   error (_("expecting long_set"));
  66   return 0;
  67 }
  68
  69 static void
  70 m2_print_long_set (struct type *type, const gdb_byte *valaddr,
  71                    int embedded_offset, CORE_ADDR address,
  72                    struct ui_file *stream)
  73 {
  74   int empty_set        = 1;
  75   int element_seen     = 0;
  76   LONGEST previous_low = 0;
  77   LONGEST previous_high= 0;
  78   LONGEST i, low_bound, high_bound;
  79   LONGEST field_low, field_high;
  80   struct type *range;
  81   int len, field;
  82   struct type *target;
  83   int bitval;
  84
  85   CHECK_TYPEDEF (type);
  86
  87   fprintf_filtered (stream, "{");
  88   len = TYPE_NFIELDS (type);
  89   if (get_long_set_bounds (type, &low_bound, &high_bound))
  90     {
  91       field = TYPE_N_BASECLASSES (type);
  92       range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
  93     }
  94   else
  95     {
  96       fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
  97       return;
  98     }
  99
 100   target = TYPE_TARGET_TYPE (range);
 101
 102   if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
 103     {
 104       for (i = low_bound; i <= high_bound; i++)
 105         {
 106           bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
 107                                     (TYPE_FIELD_BITPOS (type, field) / 8) +
 108                                     valaddr + embedded_offset, i);
 109           if (bitval < 0)
 110             error (_("bit test is out of range"));
 111           else if (bitval > 0)
 112             {
 113               previous_high = i;
 114               if (! element_seen)
 115                 {
 116                   if (! empty_set)
 117                     fprintf_filtered (stream, ", ");
 118                   print_type_scalar (target, i, stream);
 119                   empty_set    = 0;
 120                   element_seen = 1;
 121                   previous_low = i;
 122                 }
 123             }
 124           else
 125             {
 126               /* bit is not set */
 127               if (element_seen)
 128                 {
 129                   if (previous_low+1 < previous_high)
 130                     fprintf_filtered (stream, "..");
 131                   if (previous_low+1 < previous_high)
 132                     print_type_scalar (target, previous_high, stream);
 133                   element_seen = 0;
 134                 }
 135             }
 136           if (i == field_high)
 137             {
 138               field++;
 139               if (field == len)
 140                 break;
 141               range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 142               if (get_discrete_bounds (range, &field_low, &field_high) < 0)
 143                 break;
 144               target = TYPE_TARGET_TYPE (range);
 145             }
 146         }
 147       if (element_seen)
 148         {
 149           if (previous_low+1 < previous_high)
 150             {
 151               fprintf_filtered (stream, "..");
 152               print_type_scalar (target, previous_high, stream);
 153             }
 154           element_seen = 0;
 155         }
 156       fprintf_filtered (stream, "}");
 157     }
 158 }
 159
 160 static void
 161 m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
 162                           int embedded_offset, CORE_ADDR address,
 163                           struct ui_file *stream, int recurse,
 164                           const struct value_print_options *options)
 165 {
 166   struct type *content_type;
 167   CORE_ADDR addr;
 168   LONGEST len;
 169   struct value *val;
 170
 171   CHECK_TYPEDEF (type);
 172   content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
 173
 174   addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
 175                          (TYPE_FIELD_BITPOS (type, 0) / 8) +
 176                          valaddr + embedded_offset);
 177
 178   val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
 179                        addr);
 180   len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
 181
 182   fprintf_filtered (stream, "{");
 183   m2_print_array_contents (value_type (val),
 184                            value_contents_for_printing (val),
 185                            value_embedded_offset (val), addr, stream,
 186                            recurse, val, options, len);
 187   fprintf_filtered (stream, ", HIGH = %d}", (int) len);
 188 }
 189
 190 static int
 191 print_unpacked_pointer (struct type *type,
 192                         CORE_ADDR address, CORE_ADDR addr,
 193                         const struct value_print_options *options,
 194                         struct ui_file *stream)
 195 {
 196   struct gdbarch *gdbarch = get_type_arch (type);
 197   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 198
 199   if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 200     {
 201       /* Try to print what function it points to.  */
 202       print_function_pointer_address (options, gdbarch, addr, stream);
 203       /* Return value is irrelevant except for string pointers.  */
 204       return 0;
 205     }
 206
 207   if (options->addressprint && options->format != 's')
 208     fputs_filtered (paddress (gdbarch, address), stream);
 209
 210   /* For a pointer to char or unsigned char, also print the string
 211      pointed to, unless pointer is null.  */
 212
 213   if (TYPE_LENGTH (elttype) == 1
 214       && TYPE_CODE (elttype) == TYPE_CODE_INT
 215       && (options->format == 0 || options->format == 's')
 216       && addr != 0)
 217     return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 218                              stream, options);
 219
 220   return 0;
 221 }
 222
 223 static void
 224 print_variable_at_address (struct type *type,
 225                            const gdb_byte *valaddr,
 226                            struct ui_file *stream,
 227                            int recurse,
 228                            const struct value_print_options *options)
 229 {
 230   struct gdbarch *gdbarch = get_type_arch (type);
 231   CORE_ADDR addr = unpack_pointer (type, valaddr);
 232   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 233
 234   fprintf_filtered (stream, "[");
 235   fputs_filtered (paddress (gdbarch, addr), stream);
 236   fprintf_filtered (stream, "] : ");
 237
 238   if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 239     {
 240       struct value *deref_val =
 241         value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
 242
 243       common_val_print (deref_val, stream, recurse, options, current_language);
 244     }
 245   else
 246     fputs_filtered ("???", stream);
 247 }
 248
 249
 250 /* m2_print_array_contents - prints out the contents of an
 251                              array up to a max_print values.
 252                              It prints arrays of char as a string
 253                              and all other data types as comma
 254                              separated values.  */
 255
 256 static void
 257 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
 258                          int embedded_offset, CORE_ADDR address,
 259                          struct ui_file *stream, int recurse,
 260                          const struct value *val,
 261                          const struct value_print_options *options,
 262                          int len)
 263 {
 264   int eltlen;
 265   CHECK_TYPEDEF (type);
 266
 267   if (TYPE_LENGTH (type) > 0)
 268     {
 269       eltlen = TYPE_LENGTH (type);
 270       if (options->prettyprint_arrays)
 271         print_spaces_filtered (2 + 2 * recurse, stream);
 272       /* For an array of chars, print with string syntax.  */
 273       if (eltlen == 1 &&
 274           ((TYPE_CODE (type) == TYPE_CODE_INT)
 275            || ((current_language->la_language == language_m2)
 276                && (TYPE_CODE (type) == TYPE_CODE_CHAR)))
 277           && (options->format == 0 || options->format == 's'))
 278         val_print_string (type, NULL, address, len+1, stream, options);
 279       else
 280         {
 281           fprintf_filtered (stream, "{");
 282           val_print_array_elements (type, valaddr, embedded_offset,
 283                                     address, stream, recurse, val,
 284                                     options, 0);
 285           fprintf_filtered (stream, "}");
 286         }
 287     }
 288 }
 289
 290 /* Decorations for Modula 2.  */
 291
 292 static const struct generic_val_print_decorations m2_decorations =
 293 {
 294   "",
 295   " + ",
 296   " * I",
 297   "TRUE",
 298   "FALSE",
 299   "void"
 300 };
 301
 302 /* See val_print for a description of the various parameters of this
 303    function; they are identical.  */
 304
 305 void
 306 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 307               CORE_ADDR address, struct ui_file *stream, int recurse,
 308               const struct value *original_value,
 309               const struct value_print_options *options)
 310 {
 311   struct gdbarch *gdbarch = get_type_arch (type);
 312   unsigned int i = 0;   /* Number of characters printed.  */
 313   unsigned len;
 314   struct type *elttype;
 315   unsigned eltlen;
 316   LONGEST val;
 317   CORE_ADDR addr;
 318
 319   CHECK_TYPEDEF (type);
 320   switch (TYPE_CODE (type))
 321     {
 322     case TYPE_CODE_ARRAY:
 323       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 324         {
 325           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 326           eltlen = TYPE_LENGTH (elttype);
 327           len = TYPE_LENGTH (type) / eltlen;
 328           if (options->prettyprint_arrays)
 329             print_spaces_filtered (2 + 2 * recurse, stream);
 330           /* For an array of chars, print with string syntax.  */
 331           if (eltlen == 1 &&
 332               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 333                || ((current_language->la_language == language_m2)
 334                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 335               && (options->format == 0 || options->format == 's'))
 336             {
 337               /* If requested, look for the first null char and only print
 338                  elements up to it.  */
 339               if (options->stop_print_at_null)
 340                 {
 341                   unsigned int temp_len;
 342
 343                   /* Look for a NULL char.  */
 344                   for (temp_len = 0;
 345                        (valaddr + embedded_offset)[temp_len]
 346                          && temp_len < len && temp_len < options->print_max;
 347                        temp_len++);
 348                   len = temp_len;
 349                 }
 350
 351               LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
 352                                valaddr + embedded_offset, len, NULL,
 353                                0, options);
 354               i = len;
 355             }
 356           else
 357             {
 358               fprintf_filtered (stream, "{");
 359               val_print_array_elements (type, valaddr, embedded_offset,
 360                                         address, stream,
 361                                         recurse, original_value,
 362                                         options, 0);
 363               fprintf_filtered (stream, "}");
 364             }
 365           break;
 366         }
 367       /* Array of unspecified length: treat like pointer to first elt.  */
 368       print_unpacked_pointer (type, address, address, options, stream);
 369       break;
 370
 371     case TYPE_CODE_PTR:
 372       if (TYPE_CONST (type))
 373         print_variable_at_address (type, valaddr + embedded_offset,
 374                                    stream, recurse, options);
 375       else if (options->format && options->format != 's')
 376         val_print_scalar_formatted (type, valaddr, embedded_offset,
 377                                     original_value, options, 0, stream);
 378       else
 379         {
 380           addr = unpack_pointer (type, valaddr + embedded_offset);
 381           print_unpacked_pointer (type, addr, address, options, stream);
 382         }
 383       break;
 384
 385     case TYPE_CODE_UNION:
 386       if (recurse && !options->unionprint)
 387         {
 388           fprintf_filtered (stream, "{...}");
 389           break;
 390         }
 391       /* Fall through.  */
 392     case TYPE_CODE_STRUCT:
 393       if (m2_is_long_set (type))
 394         m2_print_long_set (type, valaddr, embedded_offset, address,
 395                            stream);
 396       else if (m2_is_unbounded_array (type))
 397         m2_print_unbounded_array (type, valaddr, embedded_offset,
 398                                   address, stream, recurse, options);
 399       else
 400         cp_print_value_fields (type, type, valaddr, embedded_offset,
 401                                address, stream, recurse, original_value,
 402                                options, NULL, 0);
 403       break;
 404
 405     case TYPE_CODE_BITSTRING:
 406     case TYPE_CODE_SET:
 407       elttype = TYPE_INDEX_TYPE (type);
 408       CHECK_TYPEDEF (elttype);
 409       if (TYPE_STUB (elttype))
 410         {
 411           fprintf_filtered (stream, _("<incomplete type>"));
 412           gdb_flush (stream);
 413           break;
 414         }
 415       else
 416         {
 417           struct type *range = elttype;
 418           LONGEST low_bound, high_bound;
 419           int i;
 420           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 421           int need_comma = 0;
 422
 423           if (is_bitstring)
 424             fputs_filtered ("B'", stream);
 425           else
 426             fputs_filtered ("{", stream);
 427
 428           i = get_discrete_bounds (range, &low_bound, &high_bound);
 429         maybe_bad_bstring:
 430           if (i < 0)
 431             {
 432               fputs_filtered (_("<error value>"), stream);
 433               goto done;
 434             }
 435
 436           for (i = low_bound; i <= high_bound; i++)
 437             {
 438               int element = value_bit_index (type, valaddr + embedded_offset,
 439                                              i);
 440
 441               if (element < 0)
 442                 {
 443                   i = element;
 444                   goto maybe_bad_bstring;
 445                 }
 446               if (is_bitstring)
 447                 fprintf_filtered (stream, "%d", element);
 448               else if (element)
 449                 {
 450                   if (need_comma)
 451                     fputs_filtered (", ", stream);
 452                   print_type_scalar (range, i, stream);
 453                   need_comma = 1;
 454
 455                   if (i + 1 <= high_bound
 456                       && value_bit_index (type, valaddr + embedded_offset,
 457                                           ++i))
 458                     {
 459                       int j = i;
 460
 461                       fputs_filtered ("..", stream);
 462                       while (i + 1 <= high_bound
 463                              && value_bit_index (type,
 464                                                  valaddr + embedded_offset,
 465                                                  ++i))
 466                         j = i;
 467                       print_type_scalar (range, j, stream);
 468                     }
 469                 }
 470             }
 471         done:
 472           if (is_bitstring)
 473             fputs_filtered ("'", stream);
 474           else
 475             fputs_filtered ("}", stream);
 476         }
 477       break;
 478
 479     case TYPE_CODE_RANGE:
 480       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 481         {
 482           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 483                         address, stream, recurse, original_value, options);
 484           break;
 485         }
 486       /* FIXME: create_range_type does not set the unsigned bit in a
 487          range type (I think it probably should copy it from the target
 488          type), so we won't print values which are too large to
 489          fit in a signed integer correctly.  */
 490       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 491          print with the target type, though, because the size of our type
 492          and the target type might differ).  */
 493       /* FALLTHROUGH */
 494
 495     case TYPE_CODE_REF:
 496     case TYPE_CODE_ENUM:
 497     case TYPE_CODE_FUNC:
 498     case TYPE_CODE_INT:
 499     case TYPE_CODE_FLT:
 500     case TYPE_CODE_METHOD:
 501     case TYPE_CODE_VOID:
 502     case TYPE_CODE_ERROR:
 503     case TYPE_CODE_UNDEF:
 504     case TYPE_CODE_BOOL:
 505     case TYPE_CODE_CHAR:
 506     default:
 507       generic_val_print (type, valaddr, embedded_offset, address,
 508                          stream, recurse, original_value, options,
 509                          &m2_decorations);
 510       break;
 511     }
 512   gdb_flush (stream);
 513 }