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, 2009, 2010, 2011 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 /* Print function pointer with inferior address ADDRESS onto stdio
  47    stream STREAM.  */
  48
  49 static void
  50 print_function_pointer_address (struct gdbarch *gdbarch, CORE_ADDR address,
  51                                 struct ui_file *stream, int addressprint)
  52 {
  53   CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
  54                                                             &current_target);
  55
  56   /* If the function pointer is represented by a description, print the
  57      address of the description.  */
  58   if (addressprint && func_addr != address)
  59     {
  60       fputs_filtered ("@", stream);
  61       fputs_filtered (paddress (gdbarch, address), stream);
  62       fputs_filtered (": ", stream);
  63     }
  64   print_address_demangle (gdbarch, func_addr, stream, demangle);
  65 }
  66
  67 /* get_long_set_bounds - assigns the bounds of the long set to low and
  68                          high.  */
  69
  70 int
  71 get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
  72 {
  73   int len, i;
  74
  75   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
  76     {
  77       len = TYPE_NFIELDS (type);
  78       i = TYPE_N_BASECLASSES (type);
  79       if (len == 0)
  80         return 0;
  81       *low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
  82       *high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
  83                                                                  len-1)));
  84       return 1;
  85     }
  86   error (_("expecting long_set"));
  87   return 0;
  88 }
  89
  90 static void
  91 m2_print_long_set (struct type *type, const gdb_byte *valaddr,
  92                    int embedded_offset, CORE_ADDR address,
  93                    struct ui_file *stream)
  94 {
  95   int empty_set        = 1;
  96   int element_seen     = 0;
  97   LONGEST previous_low = 0;
  98   LONGEST previous_high= 0;
  99   LONGEST i, low_bound, high_bound;
 100   LONGEST field_low, field_high;
 101   struct type *range;
 102   int len, field;
 103   struct type *target;
 104   int bitval;
 105
 106   CHECK_TYPEDEF (type);
 107
 108   fprintf_filtered (stream, "{");
 109   len = TYPE_NFIELDS (type);
 110   if (get_long_set_bounds (type, &low_bound, &high_bound))
 111     {
 112       field = TYPE_N_BASECLASSES (type);
 113       range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 114     }
 115   else
 116     {
 117       fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
 118       return;
 119     }
 120
 121   target = TYPE_TARGET_TYPE (range);
 122
 123   if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
 124     {
 125       for (i = low_bound; i <= high_bound; i++)
 126         {
 127           bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
 128                                     (TYPE_FIELD_BITPOS (type, field) / 8) +
 129                                     valaddr + embedded_offset, i);
 130           if (bitval < 0)
 131             error (_("bit test is out of range"));
 132           else if (bitval > 0)
 133             {
 134               previous_high = i;
 135               if (! element_seen)
 136                 {
 137                   if (! empty_set)
 138                     fprintf_filtered (stream, ", ");
 139                   print_type_scalar (target, i, stream);
 140                   empty_set    = 0;
 141                   element_seen = 1;
 142                   previous_low = i;
 143                 }
 144             }
 145           else
 146             {
 147               /* bit is not set */
 148               if (element_seen)
 149                 {
 150                   if (previous_low+1 < previous_high)
 151                     fprintf_filtered (stream, "..");
 152                   if (previous_low+1 < previous_high)
 153                     print_type_scalar (target, previous_high, stream);
 154                   element_seen = 0;
 155                 }
 156             }
 157           if (i == field_high)
 158             {
 159               field++;
 160               if (field == len)
 161                 break;
 162               range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 163               if (get_discrete_bounds (range, &field_low, &field_high) < 0)
 164                 break;
 165               target = TYPE_TARGET_TYPE (range);
 166             }
 167         }
 168       if (element_seen)
 169         {
 170           if (previous_low+1 < previous_high)
 171             {
 172               fprintf_filtered (stream, "..");
 173               print_type_scalar (target, previous_high, stream);
 174             }
 175           element_seen = 0;
 176         }
 177       fprintf_filtered (stream, "}");
 178     }
 179 }
 180
 181 static void
 182 m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
 183                           int embedded_offset, CORE_ADDR address,
 184                           struct ui_file *stream, int recurse,
 185                           const struct value_print_options *options)
 186 {
 187   struct type *content_type;
 188   CORE_ADDR addr;
 189   LONGEST len;
 190   struct value *val;
 191
 192   CHECK_TYPEDEF (type);
 193   content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
 194
 195   addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
 196                          (TYPE_FIELD_BITPOS (type, 0) / 8) +
 197                          valaddr + embedded_offset);
 198
 199   val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
 200                        addr);
 201   len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
 202
 203   fprintf_filtered (stream, "{");
 204   m2_print_array_contents (value_type (val),
 205                            value_contents_for_printing (val),
 206                            value_embedded_offset (val), addr, stream,
 207                            recurse, val, options, len);
 208   fprintf_filtered (stream, ", HIGH = %d}", (int) len);
 209 }
 210
 211 static int
 212 print_unpacked_pointer (struct type *type,
 213                         CORE_ADDR address, CORE_ADDR addr,
 214                         const struct value_print_options *options,
 215                         struct ui_file *stream)
 216 {
 217   struct gdbarch *gdbarch = get_type_arch (type);
 218   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 219
 220   if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 221     {
 222       /* Try to print what function it points to.  */
 223       print_function_pointer_address (gdbarch, addr, stream,
 224                                       options->addressprint);
 225       /* Return value is irrelevant except for string pointers.  */
 226       return 0;
 227     }
 228
 229   if (options->addressprint && options->format != 's')
 230     fputs_filtered (paddress (gdbarch, 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       && (options->format == 0 || options->format == 's')
 238       && addr != 0)
 239     return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 240                              stream, options);
 241
 242   return 0;
 243 }
 244
 245 static void
 246 print_variable_at_address (struct type *type,
 247                            const gdb_byte *valaddr,
 248                            struct ui_file *stream,
 249                            int recurse,
 250                            const struct value_print_options *options)
 251 {
 252   struct gdbarch *gdbarch = get_type_arch (type);
 253   CORE_ADDR addr = unpack_pointer (type, valaddr);
 254   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 255
 256   fprintf_filtered (stream, "[");
 257   fputs_filtered (paddress (gdbarch, addr), stream);
 258   fprintf_filtered (stream, "] : ");
 259
 260   if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 261     {
 262       struct value *deref_val =
 263         value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
 264
 265       common_val_print (deref_val, stream, recurse, options, current_language);
 266     }
 267   else
 268     fputs_filtered ("???", stream);
 269 }
 270
 271
 272 /* m2_print_array_contents - prints out the contents of an
 273                              array up to a max_print values.
 274                              It prints arrays of char as a string
 275                              and all other data types as comma
 276                              separated values.  */
 277
 278 static void
 279 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
 280                          int embedded_offset, CORE_ADDR address,
 281                          struct ui_file *stream, int recurse,
 282                          const struct value *val,
 283                          const struct value_print_options *options,
 284                          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 (options->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           && (options->format == 0 || options->format == 's'))
 300         val_print_string (type, NULL, address, len+1, stream, options);
 301       else
 302         {
 303           fprintf_filtered (stream, "{");
 304           val_print_array_elements (type, valaddr, embedded_offset,
 305                                     address, stream, recurse, val,
 306                                     options, 0);
 307           fprintf_filtered (stream, "}");
 308         }
 309     }
 310 }
 311
 312
 313 /* See val_print for a description of the various parameters of this
 314    function; they are identical.  The semantics of the return value is
 315    also identical to val_print.  */
 316
 317 int
 318 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 319               CORE_ADDR address, struct ui_file *stream, int recurse,
 320               const struct value *original_value,
 321               const struct value_print_options *options)
 322 {
 323   struct gdbarch *gdbarch = get_type_arch (type);
 324   unsigned int i = 0;   /* Number of characters printed.  */
 325   unsigned len;
 326   struct type *elttype;
 327   unsigned eltlen;
 328   LONGEST val;
 329   CORE_ADDR addr;
 330
 331   CHECK_TYPEDEF (type);
 332   switch (TYPE_CODE (type))
 333     {
 334     case TYPE_CODE_ARRAY:
 335       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 336         {
 337           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 338           eltlen = TYPE_LENGTH (elttype);
 339           len = TYPE_LENGTH (type) / eltlen;
 340           if (options->prettyprint_arrays)
 341             print_spaces_filtered (2 + 2 * recurse, stream);
 342           /* For an array of chars, print with string syntax.  */
 343           if (eltlen == 1 &&
 344               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 345                || ((current_language->la_language == language_m2)
 346                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 347               && (options->format == 0 || options->format == 's'))
 348             {
 349               /* If requested, look for the first null char and only print
 350                  elements up to it.  */
 351               if (options->stop_print_at_null)
 352                 {
 353                   unsigned int temp_len;
 354
 355                   /* Look for a NULL char.  */
 356                   for (temp_len = 0;
 357                        (valaddr + embedded_offset)[temp_len]
 358                          && temp_len < len && temp_len < options->print_max;
 359                        temp_len++);
 360                   len = temp_len;
 361                 }
 362
 363               LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
 364                                valaddr + embedded_offset, len, NULL,
 365                                0, options);
 366               i = len;
 367             }
 368           else
 369             {
 370               fprintf_filtered (stream, "{");
 371               val_print_array_elements (type, valaddr, embedded_offset,
 372                                         address, stream,
 373                                         recurse, original_value,
 374                                         options, 0);
 375               fprintf_filtered (stream, "}");
 376             }
 377           break;
 378         }
 379       /* Array of unspecified length: treat like pointer to first elt.  */
 380       print_unpacked_pointer (type, address, address, options, stream);
 381       break;
 382
 383     case TYPE_CODE_PTR:
 384       if (TYPE_CONST (type))
 385         print_variable_at_address (type, valaddr + embedded_offset,
 386                                    stream, recurse, options);
 387       else if (options->format && options->format != 's')
 388         val_print_scalar_formatted (type, valaddr, embedded_offset,
 389                                     original_value, options, 0, stream);
 390       else
 391         {
 392           addr = unpack_pointer (type, valaddr + embedded_offset);
 393           print_unpacked_pointer (type, addr, address, options, stream);
 394         }
 395       break;
 396
 397     case TYPE_CODE_REF:
 398       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 399       if (options->addressprint)
 400         {
 401           CORE_ADDR addr
 402             = extract_typed_address (valaddr + embedded_offset, type);
 403
 404           fprintf_filtered (stream, "@");
 405           fputs_filtered (paddress (gdbarch, addr), stream);
 406           if (options->deref_ref)
 407             fputs_filtered (": ", stream);
 408         }
 409       /* De-reference the reference.  */
 410       if (options->deref_ref)
 411         {
 412           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 413             {
 414               struct value *deref_val =
 415                 value_at
 416                 (TYPE_TARGET_TYPE (type),
 417                  unpack_pointer (type, valaddr + embedded_offset));
 418
 419               common_val_print (deref_val, stream, recurse, options,
 420                                 current_language);
 421             }
 422           else
 423             fputs_filtered ("???", stream);
 424         }
 425       break;
 426
 427     case TYPE_CODE_UNION:
 428       if (recurse && !options->unionprint)
 429         {
 430           fprintf_filtered (stream, "{...}");
 431           break;
 432         }
 433       /* Fall through.  */
 434     case TYPE_CODE_STRUCT:
 435       if (m2_is_long_set (type))
 436         m2_print_long_set (type, valaddr, embedded_offset, address,
 437                            stream);
 438       else if (m2_is_unbounded_array (type))
 439         m2_print_unbounded_array (type, valaddr, embedded_offset,
 440                                   address, stream, recurse, options);
 441       else
 442         cp_print_value_fields (type, type, valaddr, embedded_offset,
 443                                address, stream, recurse, original_value,
 444                                options, NULL, 0);
 445       break;
 446
 447     case TYPE_CODE_ENUM:
 448       if (options->format)
 449         {
 450           val_print_scalar_formatted (type, valaddr, embedded_offset,
 451                                       original_value, options, 0, stream);
 452           break;
 453         }
 454       len = TYPE_NFIELDS (type);
 455       val = unpack_long (type, valaddr + embedded_offset);
 456       for (i = 0; i < len; i++)
 457         {
 458           QUIT;
 459           if (val == TYPE_FIELD_BITPOS (type, i))
 460             {
 461               break;
 462             }
 463         }
 464       if (i < len)
 465         {
 466           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 467         }
 468       else
 469         {
 470           print_longest (stream, 'd', 0, val);
 471         }
 472       break;
 473
 474     case TYPE_CODE_FUNC:
 475       if (options->format)
 476         {
 477           val_print_scalar_formatted (type, valaddr, embedded_offset,
 478                                       original_value, options, 0, stream);
 479           break;
 480         }
 481       /* FIXME, we should consider, at least for ANSI C language, eliminating
 482          the distinction made between FUNCs and POINTERs to FUNCs.  */
 483       fprintf_filtered (stream, "{");
 484       type_print (type, "", stream, -1);
 485       fprintf_filtered (stream, "} ");
 486       /* Try to print what function it points to, and its address.  */
 487       print_address_demangle (gdbarch, address, stream, demangle);
 488       break;
 489
 490     case TYPE_CODE_BOOL:
 491       if (options->format || options->output_format)
 492         {
 493           struct value_print_options opts = *options;
 494
 495           opts.format = (options->format ? options->format
 496                          : options->output_format);
 497           val_print_scalar_formatted (type, valaddr, embedded_offset,
 498                                       original_value, &opts, 0, stream);
 499         }
 500       else
 501         {
 502           val = unpack_long (type, valaddr + embedded_offset);
 503           if (val == 0)
 504             fputs_filtered ("FALSE", stream);
 505           else if (val == 1)
 506             fputs_filtered ("TRUE", stream);
 507           else
 508             fprintf_filtered (stream, "%ld)", (long int) val);
 509         }
 510       break;
 511
 512     case TYPE_CODE_RANGE:
 513       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 514         {
 515           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 516                         address, stream, recurse, original_value, options);
 517           break;
 518         }
 519       /* FIXME: create_range_type does not set the unsigned bit in a
 520          range type (I think it probably should copy it from the target
 521          type), so we won't print values which are too large to
 522          fit in a signed integer correctly.  */
 523       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 524          print with the target type, though, because the size of our type
 525          and the target type might differ).  */
 526       /* FALLTHROUGH */
 527
 528     case TYPE_CODE_INT:
 529       if (options->format || options->output_format)
 530         {
 531           struct value_print_options opts = *options;
 532
 533           opts.format = (options->format ? options->format
 534                          : options->output_format);
 535           val_print_scalar_formatted (type, valaddr, embedded_offset,
 536                                       original_value, &opts, 0, stream);
 537         }
 538       else
 539         val_print_type_code_int (type, valaddr + embedded_offset, stream);
 540       break;
 541
 542     case TYPE_CODE_CHAR:
 543       if (options->format || options->output_format)
 544         {
 545           struct value_print_options opts = *options;
 546
 547           opts.format = (options->format ? options->format
 548                          : options->output_format);
 549           val_print_scalar_formatted (type, valaddr, embedded_offset,
 550                                       original_value, &opts, 0, stream);
 551         }
 552       else
 553         {
 554           val = unpack_long (type, valaddr + embedded_offset);
 555           if (TYPE_UNSIGNED (type))
 556             fprintf_filtered (stream, "%u", (unsigned int) val);
 557           else
 558             fprintf_filtered (stream, "%d", (int) val);
 559           fputs_filtered (" ", stream);
 560           LA_PRINT_CHAR ((unsigned char) val, type, stream);
 561         }
 562       break;
 563
 564     case TYPE_CODE_FLT:
 565       if (options->format)
 566         val_print_scalar_formatted (type, valaddr, embedded_offset,
 567                                     original_value, options, 0, stream);
 568       else
 569         print_floating (valaddr + embedded_offset, type, stream);
 570       break;
 571
 572     case TYPE_CODE_METHOD:
 573       break;
 574
 575     case TYPE_CODE_BITSTRING:
 576     case TYPE_CODE_SET:
 577       elttype = TYPE_INDEX_TYPE (type);
 578       CHECK_TYPEDEF (elttype);
 579       if (TYPE_STUB (elttype))
 580         {
 581           fprintf_filtered (stream, _("<incomplete type>"));
 582           gdb_flush (stream);
 583           break;
 584         }
 585       else
 586         {
 587           struct type *range = elttype;
 588           LONGEST low_bound, high_bound;
 589           int i;
 590           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 591           int need_comma = 0;
 592
 593           if (is_bitstring)
 594             fputs_filtered ("B'", stream);
 595           else
 596             fputs_filtered ("{", stream);
 597
 598           i = get_discrete_bounds (range, &low_bound, &high_bound);
 599         maybe_bad_bstring:
 600           if (i < 0)
 601             {
 602               fputs_filtered (_("<error value>"), stream);
 603               goto done;
 604             }
 605
 606           for (i = low_bound; i <= high_bound; i++)
 607             {
 608               int element = value_bit_index (type, valaddr + embedded_offset,
 609                                              i);
 610
 611               if (element < 0)
 612                 {
 613                   i = element;
 614                   goto maybe_bad_bstring;
 615                 }
 616               if (is_bitstring)
 617                 fprintf_filtered (stream, "%d", element);
 618               else if (element)
 619                 {
 620                   if (need_comma)
 621                     fputs_filtered (", ", stream);
 622                   print_type_scalar (range, i, stream);
 623                   need_comma = 1;
 624
 625                   if (i + 1 <= high_bound
 626                       && value_bit_index (type, valaddr + embedded_offset,
 627                                           ++i))
 628                     {
 629                       int j = i;
 630
 631                       fputs_filtered ("..", stream);
 632                       while (i + 1 <= high_bound
 633                              && value_bit_index (type,
 634                                                  valaddr + embedded_offset,
 635                                                  ++i))
 636                         j = i;
 637                       print_type_scalar (range, j, stream);
 638                     }
 639                 }
 640             }
 641         done:
 642           if (is_bitstring)
 643             fputs_filtered ("'", stream);
 644           else
 645             fputs_filtered ("}", stream);
 646         }
 647       break;
 648
 649     case TYPE_CODE_VOID:
 650       fprintf_filtered (stream, "void");
 651       break;
 652
 653     case TYPE_CODE_ERROR:
 654       fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
 655       break;
 656
 657     case TYPE_CODE_UNDEF:
 658       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 659          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 660          and no complete type for struct foo in that file.  */
 661       fprintf_filtered (stream, _("<incomplete type>"));
 662       break;
 663
 664     default:
 665       error (_("Invalid m2 type code %d in symbol table."), TYPE_CODE (type));
 666     }
 667   gdb_flush (stream);
 668   return (0);
 669 }