gdb/m2-valprint.c

   1 /* Support for printing Modula 2 values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2016 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "symtab.h"
  22 #include "gdbtypes.h"
  23 #include "expression.h"
  24 #include "value.h"
  25 #include "valprint.h"
  26 #include "language.h"
  27 #include "typeprint.h"
  28 #include "c-lang.h"
  29 #include "m2-lang.h"
  30 #include "target.h"
  31
  32 static int print_unpacked_pointer (struct type *type,
  33                                    CORE_ADDR address, CORE_ADDR addr,
  34                                    const struct value_print_options *options,
  35                                    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 recurse,
  40                          const struct value *val,
  41                          const struct value_print_options *options,
  42                          int len);
  43
  44
  45 /* get_long_set_bounds - assigns the bounds of the long set to low and
  46                          high.  */
  47
  48 int
  49 get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
  50 {
  51   int len, i;
  52
  53   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
  54     {
  55       len = TYPE_NFIELDS (type);
  56       i = TYPE_N_BASECLASSES (type);
  57       if (len == 0)
  58         return 0;
  59       *low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
  60       *high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
  61                                                                  len-1)));
  62       return 1;
  63     }
  64   error (_("expecting long_set"));
  65   return 0;
  66 }
  67
  68 static void
  69 m2_print_long_set (struct type *type, const gdb_byte *valaddr,
  70                    int embedded_offset, CORE_ADDR address,
  71                    struct ui_file *stream)
  72 {
  73   int empty_set        = 1;
  74   int element_seen     = 0;
  75   LONGEST previous_low = 0;
  76   LONGEST previous_high= 0;
  77   LONGEST i, low_bound, high_bound;
  78   LONGEST field_low, field_high;
  79   struct type *range;
  80   int len, field;
  81   struct type *target;
  82   int bitval;
  83
  84   type = check_typedef (type);
  85
  86   fprintf_filtered (stream, "{");
  87   len = TYPE_NFIELDS (type);
  88   if (get_long_set_bounds (type, &low_bound, &high_bound))
  89     {
  90       field = TYPE_N_BASECLASSES (type);
  91       range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
  92     }
  93   else
  94     {
  95       fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
  96       return;
  97     }
  98
  99   target = TYPE_TARGET_TYPE (range);
 100
 101   if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
 102     {
 103       for (i = low_bound; i <= high_bound; i++)
 104         {
 105           bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
 106                                     (TYPE_FIELD_BITPOS (type, field) / 8) +
 107                                     valaddr + embedded_offset, i);
 108           if (bitval < 0)
 109             error (_("bit test is out of range"));
 110           else if (bitval > 0)
 111             {
 112               previous_high = i;
 113               if (! element_seen)
 114                 {
 115                   if (! empty_set)
 116                     fprintf_filtered (stream, ", ");
 117                   print_type_scalar (target, i, stream);
 118                   empty_set    = 0;
 119                   element_seen = 1;
 120                   previous_low = i;
 121                 }
 122             }
 123           else
 124             {
 125               /* bit is not set */
 126               if (element_seen)
 127                 {
 128                   if (previous_low+1 < previous_high)
 129                     fprintf_filtered (stream, "..");
 130                   if (previous_low+1 < previous_high)
 131                     print_type_scalar (target, previous_high, stream);
 132                   element_seen = 0;
 133                 }
 134             }
 135           if (i == field_high)
 136             {
 137               field++;
 138               if (field == len)
 139                 break;
 140               range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 141               if (get_discrete_bounds (range, &field_low, &field_high) < 0)
 142                 break;
 143               target = TYPE_TARGET_TYPE (range);
 144             }
 145         }
 146       if (element_seen)
 147         {
 148           if (previous_low+1 < previous_high)
 149             {
 150               fprintf_filtered (stream, "..");
 151               print_type_scalar (target, previous_high, stream);
 152             }
 153           element_seen = 0;
 154         }
 155       fprintf_filtered (stream, "}");
 156     }
 157 }
 158
 159 static void
 160 m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
 161                           int embedded_offset, CORE_ADDR address,
 162                           struct ui_file *stream, int recurse,
 163                           const struct value_print_options *options)
 164 {
 165   struct type *content_type;
 166   CORE_ADDR addr;
 167   LONGEST len;
 168   struct value *val;
 169
 170   type = check_typedef (type);
 171   content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
 172
 173   addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
 174                          (TYPE_FIELD_BITPOS (type, 0) / 8) +
 175                          valaddr + embedded_offset);
 176
 177   val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
 178                        addr);
 179   len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
 180
 181   fprintf_filtered (stream, "{");
 182   m2_print_array_contents (value_type (val),
 183                            value_contents_for_printing (val),
 184                            value_embedded_offset (val), addr, stream,
 185                            recurse, val, options, len);
 186   fprintf_filtered (stream, ", HIGH = %d}", (int) len);
 187 }
 188
 189 static int
 190 print_unpacked_pointer (struct type *type,
 191                         CORE_ADDR address, CORE_ADDR addr,
 192                         const struct value_print_options *options,
 193                         struct ui_file *stream)
 194 {
 195   struct gdbarch *gdbarch = get_type_arch (type);
 196   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 197   int want_space = 0;
 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     {
 209       fputs_filtered (paddress (gdbarch, address), stream);
 210       want_space = 1;
 211     }
 212
 213   /* For a pointer to char or unsigned char, also print the string
 214      pointed to, unless pointer is null.  */
 215
 216   if (TYPE_LENGTH (elttype) == 1
 217       && TYPE_CODE (elttype) == TYPE_CODE_INT
 218       && (options->format == 0 || options->format == 's')
 219       && addr != 0)
 220     {
 221       if (want_space)
 222         fputs_filtered (" ", stream);
 223       return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 224                                stream, options);
 225     }
 226
 227   return 0;
 228 }
 229
 230 static void
 231 print_variable_at_address (struct type *type,
 232                            const gdb_byte *valaddr,
 233                            struct ui_file *stream,
 234                            int recurse,
 235                            const struct value_print_options *options)
 236 {
 237   struct gdbarch *gdbarch = get_type_arch (type);
 238   CORE_ADDR addr = unpack_pointer (type, valaddr);
 239   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 240
 241   fprintf_filtered (stream, "[");
 242   fputs_filtered (paddress (gdbarch, addr), stream);
 243   fprintf_filtered (stream, "] : ");
 244
 245   if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 246     {
 247       struct value *deref_val =
 248         value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
 249
 250       common_val_print (deref_val, stream, recurse, options, current_language);
 251     }
 252   else
 253     fputs_filtered ("???", stream);
 254 }
 255
 256
 257 /* m2_print_array_contents - prints out the contents of an
 258                              array up to a max_print values.
 259                              It prints arrays of char as a string
 260                              and all other data types as comma
 261                              separated values.  */
 262
 263 static void
 264 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
 265                          int embedded_offset, CORE_ADDR address,
 266                          struct ui_file *stream, int recurse,
 267                          const struct value *val,
 268                          const struct value_print_options *options,
 269                          int len)
 270 {
 271   type = check_typedef (type);
 272
 273   if (TYPE_LENGTH (type) > 0)
 274     {
 275       if (options->prettyformat_arrays)
 276         print_spaces_filtered (2 + 2 * recurse, stream);
 277       /* For an array of chars, print with string syntax.  */
 278       if (TYPE_LENGTH (type) == 1 &&
 279           ((TYPE_CODE (type) == TYPE_CODE_INT)
 280            || ((current_language->la_language == language_m2)
 281                && (TYPE_CODE (type) == TYPE_CODE_CHAR)))
 282           && (options->format == 0 || options->format == 's'))
 283         val_print_string (type, NULL, address, len+1, stream, options);
 284       else
 285         {
 286           fprintf_filtered (stream, "{");
 287           val_print_array_elements (type, valaddr, embedded_offset,
 288                                     address, stream, recurse, val,
 289                                     options, 0);
 290           fprintf_filtered (stream, "}");
 291         }
 292     }
 293 }
 294
 295 /* Decorations for Modula 2.  */
 296
 297 static const struct generic_val_print_decorations m2_decorations =
 298 {
 299   "",
 300   " + ",
 301   " * I",
 302   "TRUE",
 303   "FALSE",
 304   "void",
 305   "{",
 306   "}"
 307 };
 308
 309 /* See val_print for a description of the various parameters of this
 310    function; they are identical.  */
 311
 312 void
 313 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 314               CORE_ADDR address, struct ui_file *stream, int recurse,
 315               const struct value *original_value,
 316               const struct value_print_options *options)
 317 {
 318   struct gdbarch *gdbarch = get_type_arch (type);
 319   unsigned int i = 0;   /* Number of characters printed.  */
 320   unsigned len;
 321   struct type *elttype;
 322   CORE_ADDR addr;
 323
 324   type = check_typedef (type);
 325   switch (TYPE_CODE (type))
 326     {
 327     case TYPE_CODE_ARRAY:
 328       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 329         {
 330           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 331           len = TYPE_LENGTH (type) / TYPE_LENGTH (elttype);
 332           if (options->prettyformat_arrays)
 333             print_spaces_filtered (2 + 2 * recurse, stream);
 334           /* For an array of chars, print with string syntax.  */
 335           if (TYPE_LENGTH (elttype) == 1 &&
 336               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 337                || ((current_language->la_language == language_m2)
 338                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 339               && (options->format == 0 || options->format == 's'))
 340             {
 341               /* If requested, look for the first null char and only print
 342                  elements up to it.  */
 343               if (options->stop_print_at_null)
 344                 {
 345                   unsigned int temp_len;
 346
 347                   /* Look for a NULL char.  */
 348                   for (temp_len = 0;
 349                        (valaddr + embedded_offset)[temp_len]
 350                          && temp_len < len && temp_len < options->print_max;
 351                        temp_len++);
 352                   len = temp_len;
 353                 }
 354
 355               LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
 356                                valaddr + embedded_offset, len, NULL,
 357                                0, options);
 358               i = len;
 359             }
 360           else
 361             {
 362               fprintf_filtered (stream, "{");
 363               val_print_array_elements (type, valaddr, embedded_offset,
 364                                         address, stream,
 365                                         recurse, original_value,
 366                                         options, 0);
 367               fprintf_filtered (stream, "}");
 368             }
 369           break;
 370         }
 371       /* Array of unspecified length: treat like pointer to first elt.  */
 372       print_unpacked_pointer (type, address, address, options, stream);
 373       break;
 374
 375     case TYPE_CODE_PTR:
 376       if (TYPE_CONST (type))
 377         print_variable_at_address (type, valaddr + embedded_offset,
 378                                    stream, recurse, options);
 379       else if (options->format && options->format != 's')
 380         val_print_scalar_formatted (type, valaddr, embedded_offset,
 381                                     original_value, options, 0, stream);
 382       else
 383         {
 384           addr = unpack_pointer (type, valaddr + embedded_offset);
 385           print_unpacked_pointer (type, addr, address, options, stream);
 386         }
 387       break;
 388
 389     case TYPE_CODE_UNION:
 390       if (recurse && !options->unionprint)
 391         {
 392           fprintf_filtered (stream, "{...}");
 393           break;
 394         }
 395       /* Fall through.  */
 396     case TYPE_CODE_STRUCT:
 397       if (m2_is_long_set (type))
 398         m2_print_long_set (type, valaddr, embedded_offset, address,
 399                            stream);
 400       else if (m2_is_unbounded_array (type))
 401         m2_print_unbounded_array (type, valaddr, embedded_offset,
 402                                   address, stream, recurse, options);
 403       else
 404         cp_print_value_fields (type, type, valaddr, embedded_offset,
 405                                address, stream, recurse, original_value,
 406                                options, NULL, 0);
 407       break;
 408
 409     case TYPE_CODE_SET:
 410       elttype = TYPE_INDEX_TYPE (type);
 411       elttype = check_typedef (elttype);
 412       if (TYPE_STUB (elttype))
 413         {
 414           fprintf_filtered (stream, _("<incomplete type>"));
 415           gdb_flush (stream);
 416           break;
 417         }
 418       else
 419         {
 420           struct type *range = elttype;
 421           LONGEST low_bound, high_bound;
 422           int i;
 423           int need_comma = 0;
 424
 425           fputs_filtered ("{", stream);
 426
 427           i = get_discrete_bounds (range, &low_bound, &high_bound);
 428         maybe_bad_bstring:
 429           if (i < 0)
 430             {
 431               fputs_filtered (_("<error value>"), stream);
 432               goto done;
 433             }
 434
 435           for (i = low_bound; i <= high_bound; i++)
 436             {
 437               int element = value_bit_index (type, valaddr + embedded_offset,
 438                                              i);
 439
 440               if (element < 0)
 441                 {
 442                   i = element;
 443                   goto maybe_bad_bstring;
 444                 }
 445               if (element)
 446                 {
 447                   if (need_comma)
 448                     fputs_filtered (", ", stream);
 449                   print_type_scalar (range, i, stream);
 450                   need_comma = 1;
 451
 452                   if (i + 1 <= high_bound
 453                       && value_bit_index (type, valaddr + embedded_offset,
 454                                           ++i))
 455                     {
 456                       int j = i;
 457
 458                       fputs_filtered ("..", stream);
 459                       while (i + 1 <= high_bound
 460                              && value_bit_index (type,
 461                                                  valaddr + embedded_offset,
 462                                                  ++i))
 463                         j = i;
 464                       print_type_scalar (range, j, stream);
 465                     }
 466                 }
 467             }
 468         done:
 469           fputs_filtered ("}", stream);
 470         }
 471       break;
 472
 473     case TYPE_CODE_RANGE:
 474       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 475         {
 476           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 477                         address, stream, recurse, original_value, options);
 478           break;
 479         }
 480       /* FIXME: create_static_range_type does not set the unsigned bit in a
 481          range type (I think it probably should copy it from the target
 482          type), so we won't print values which are too large to
 483          fit in a signed integer correctly.  */
 484       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 485          print with the target type, though, because the size of our type
 486          and the target type might differ).  */
 487       /* FALLTHROUGH */
 488
 489     case TYPE_CODE_REF:
 490     case TYPE_CODE_ENUM:
 491     case TYPE_CODE_FUNC:
 492     case TYPE_CODE_INT:
 493     case TYPE_CODE_FLT:
 494     case TYPE_CODE_METHOD:
 495     case TYPE_CODE_VOID:
 496     case TYPE_CODE_ERROR:
 497     case TYPE_CODE_UNDEF:
 498     case TYPE_CODE_BOOL:
 499     case TYPE_CODE_CHAR:
 500     default:
 501       generic_val_print (type, valaddr, embedded_offset, address,
 502                          stream, recurse, original_value, options,
 503                          &m2_decorations);
 504       break;
 505     }
 506   gdb_flush (stream);
 507 }