gnu/dist/gdb6/gdb/m2-typeprint.c

   1 /* Support for printing Modula 2 types for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1988, 1989, 1991, 1992, 1995, 2000, 2001,
   3                  2002, 2003, 2004, 2005, 2006
   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 2 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, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdb_obstack.h"
  25 #include "bfd.h"                /* Binary File Description */
  26 #include "symtab.h"
  27 #include "gdbtypes.h"
  28 #include "expression.h"
  29 #include "value.h"
  30 #include "gdbcore.h"
  31 #include "m2-lang.h"
  32 #include "target.h"
  33 #include "language.h"
  34 #include "demangle.h"
  35 #include "c-lang.h"
  36 #include "typeprint.h"
  37 #include "cp-abi.h"
  38
  39 #include "gdb_string.h"
  40 #include <errno.h>
  41
  42 static void m2_print_bounds (struct type *type,
  43                              struct ui_file *stream, int show, int level,
  44                              int print_high);
  45
  46 static void m2_typedef (struct type *, struct ui_file *, int, int);
  47 static void m2_array (struct type *, struct ui_file *, int, int);
  48 static void m2_pointer (struct type *, struct ui_file *, int, int);
  49 static void m2_ref (struct type *, struct ui_file *, int, int);
  50 static void m2_procedure (struct type *, struct ui_file *, int, int);
  51 static void m2_union (struct type *, struct ui_file *);
  52 static void m2_enum (struct type *, struct ui_file *, int, int);
  53 static void m2_range (struct type *, struct ui_file *, int, int);
  54 static void m2_type_name (struct type *type, struct ui_file *stream);
  55 static void m2_short_set (struct type *type, struct ui_file *stream,
  56                           int show, int level);
  57 static int m2_long_set (struct type *type, struct ui_file *stream,
  58                         int show, int level);
  59 static void m2_record_fields (struct type *type, struct ui_file *stream,
  60                               int show, int level);
  61 static void m2_unknown (const char *s, struct type *type,
  62                         struct ui_file *stream, int show, int level);
  63
  64 int m2_is_long_set (struct type *type);
  65 int m2_is_long_set_of_type (struct type *type, struct type **of_type);
  66
  67
  68 void
  69 m2_print_type (struct type *type, char *varstring, struct ui_file *stream,
  70                int show, int level)
  71 {
  72   enum type_code code;
  73   int demangled_args;
  74
  75   CHECK_TYPEDEF (type);
  76   code = TYPE_CODE (type);
  77
  78   QUIT;
  79
  80   wrap_here ("    ");
  81   if (type == NULL)
  82     {
  83       fputs_filtered (_("<type unknown>"), stream);
  84       return;
  85     }
  86
  87   switch (TYPE_CODE (type))
  88     {
  89     case TYPE_CODE_SET:
  90       m2_short_set(type, stream, show, level);
  91       break;
  92
  93     case TYPE_CODE_STRUCT:
  94       if (m2_long_set (type, stream, show, level))
  95         break;
  96       m2_record_fields (type, stream, show, level);
  97       break;
  98
  99     case TYPE_CODE_TYPEDEF:
 100       m2_typedef (type, stream, show, level);
 101       break;
 102
 103     case TYPE_CODE_ARRAY:
 104       m2_array (type, stream, show, level);
 105       break;
 106
 107     case TYPE_CODE_PTR:
 108       m2_pointer (type, stream, show, level);
 109       break;
 110
 111     case TYPE_CODE_REF:
 112       m2_ref (type, stream, show, level);
 113       break;
 114
 115     case TYPE_CODE_MEMBER:
 116       m2_unknown (_("member"), type, stream, show, level);
 117       break;
 118
 119     case TYPE_CODE_METHOD:
 120       m2_unknown (_("method"), type, stream, show, level);
 121       break;
 122
 123     case TYPE_CODE_FUNC:
 124       m2_procedure (type, stream, show, level);
 125       break;
 126
 127     case TYPE_CODE_UNION:
 128       m2_union (type, stream);
 129       break;
 130
 131     case TYPE_CODE_ENUM:
 132       m2_enum (type, stream, show, level);
 133       break;
 134
 135     case TYPE_CODE_VOID:
 136       break;
 137
 138     case TYPE_CODE_UNDEF:
 139       /* i18n: Do not translate the "struct" part! */
 140       m2_unknown (_("undef"), type, stream, show, level);
 141       break;
 142
 143     case TYPE_CODE_ERROR:
 144       m2_unknown (_("error"), type, stream, show, level);
 145       break;
 146
 147     case TYPE_CODE_RANGE:
 148       m2_range (type, stream, show, level);
 149       break;
 150
 151     case TYPE_CODE_TEMPLATE:
 152       break;
 153
 154     default:
 155       m2_type_name (type, stream);
 156       break;
 157     }
 158 }
 159
 160 /*
 161  *  m2_type_name - if a, type, has a name then print it.
 162  */
 163
 164 void
 165 m2_type_name (struct type *type, struct ui_file *stream)
 166 {
 167   if (TYPE_NAME (type) != NULL)
 168     fputs_filtered (TYPE_NAME (type), stream);
 169 }
 170
 171 /*
 172  *  m2_range - displays a Modula-2 subrange type.
 173  */
 174
 175 void
 176 m2_range (struct type *type, struct ui_file *stream, int show,
 177           int level)
 178 {
 179   if (TYPE_HIGH_BOUND (type) == TYPE_LOW_BOUND (type))
 180     m2_print_type (TYPE_DOMAIN_TYPE (type), "", stream, show, level);
 181   else
 182     {
 183       struct type *target = TYPE_TARGET_TYPE (type);
 184
 185       fprintf_filtered (stream, "[");
 186       print_type_scalar (target, TYPE_LOW_BOUND (type), stream);
 187       fprintf_filtered (stream, "..");
 188       print_type_scalar (target, TYPE_HIGH_BOUND (type), stream);
 189       fprintf_filtered (stream, "]");
 190     }
 191 }
 192
 193 static void
 194 m2_typedef (struct type *type, struct ui_file *stream, int show,
 195             int level)
 196 {
 197   if (TYPE_NAME (type) != NULL)
 198     {
 199       fputs_filtered (TYPE_NAME (type), stream);
 200       fputs_filtered (" = ", stream);
 201     }
 202   m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);
 203 }
 204
 205 /*
 206  *  m2_array - prints out a Modula-2 ARRAY ... OF type
 207  */
 208
 209 static void m2_array (struct type *type, struct ui_file *stream,
 210                       int show, int level)
 211 {
 212   fprintf_filtered (stream, "ARRAY [");
 213   if (TYPE_LENGTH (type) >= 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0
 214       && TYPE_ARRAY_UPPER_BOUND_TYPE (type) != BOUND_CANNOT_BE_DETERMINED)
 215     {
 216       if (TYPE_INDEX_TYPE (type) != 0)
 217         {
 218           m2_print_bounds (TYPE_INDEX_TYPE (type), stream, show, -1, 0);
 219           fprintf_filtered (stream, "..");
 220           m2_print_bounds (TYPE_INDEX_TYPE (type), stream, show, -1, 1);
 221         }
 222       else
 223         fprintf_filtered (stream, "%d",
 224                           (TYPE_LENGTH (type)
 225                            / TYPE_LENGTH (TYPE_TARGET_TYPE (type))));
 226     }
 227   fprintf_filtered (stream, "] OF ");
 228   m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);
 229 }
 230
 231 static void
 232 m2_pointer (struct type *type, struct ui_file *stream, int show,
 233             int level)
 234 {
 235   if (TYPE_CONST (type))
 236     fprintf_filtered (stream, "[...] : ");
 237   else
 238     fprintf_filtered (stream, "POINTER TO ");
 239
 240   m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);
 241 }
 242
 243 static void
 244 m2_ref (struct type *type, struct ui_file *stream, int show,
 245         int level)
 246 {
 247   fprintf_filtered (stream, "VAR");
 248   m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);
 249 }
 250
 251 static void
 252 m2_unknown (const char *s, struct type *type, struct ui_file *stream,
 253             int show, int level)
 254 {
 255   fprintf_filtered (stream, "%s %s", s, _("is unknown"));
 256 }
 257
 258 static void m2_union (struct type *type, struct ui_file *stream)
 259 {
 260   fprintf_filtered (stream, "union");
 261 }
 262
 263 static void
 264 m2_procedure (struct type *type, struct ui_file *stream,
 265               int show, int level)
 266 {
 267   fprintf_filtered (stream, "PROCEDURE ");
 268   m2_type_name (type, stream);
 269   if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
 270     {
 271       int i, len = TYPE_NFIELDS (type);
 272
 273       fprintf_filtered (stream, " (");
 274       for (i = 0; i < len; i++)
 275         {
 276           if (i > 0)
 277             {
 278               fputs_filtered (", ", stream);
 279               wrap_here ("    ");
 280             }
 281           m2_print_type (TYPE_FIELD_TYPE (type, i), "", stream, -1, 0);
 282         }
 283       if (TYPE_TARGET_TYPE (type) != NULL)
 284         {
 285           fprintf_filtered (stream, " : ");
 286           m2_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0);
 287         }
 288     }
 289 }
 290
 291 static void
 292 m2_print_bounds (struct type *type,
 293                  struct ui_file *stream, int show, int level,
 294                  int print_high)
 295 {
 296   struct type *target = TYPE_TARGET_TYPE (type);
 297
 298   if (target == NULL)
 299     target = builtin_type_int;
 300
 301   if (TYPE_NFIELDS(type) == 0)
 302     return;
 303
 304   if (print_high)
 305     print_type_scalar (target, TYPE_HIGH_BOUND (type), stream);
 306   else
 307     print_type_scalar (target, TYPE_LOW_BOUND (type), stream);
 308 }
 309
 310 static void
 311 m2_short_set (struct type *type, struct ui_file *stream, int show, int level)
 312 {
 313   fprintf_filtered(stream, "SET [");
 314   m2_print_bounds (TYPE_INDEX_TYPE (type), stream,
 315                    show - 1, level, 0);
 316
 317   fprintf_filtered(stream, "..");
 318   m2_print_bounds (TYPE_INDEX_TYPE (type), stream,
 319                    show - 1, level, 1);
 320   fprintf_filtered(stream, "]");
 321 }
 322
 323 int
 324 m2_is_long_set (struct type *type)
 325 {
 326   LONGEST previous_high = 0;  /* unnecessary initialization
 327                                  keeps gcc -Wall happy */
 328   int len, i;
 329   struct type *range;
 330
 331   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
 332     {
 333
 334       /*
 335        *  check if all fields of the RECORD are consecutive sets
 336        */
 337       len = TYPE_NFIELDS (type);
 338       for (i = TYPE_N_BASECLASSES (type); i < len; i++)
 339         {
 340           if (TYPE_FIELD_TYPE (type, i) == NULL)
 341             return 0;
 342           if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) != TYPE_CODE_SET)
 343             return 0;
 344           if (TYPE_FIELD_NAME (type, i) != NULL
 345               && (strcmp (TYPE_FIELD_NAME (type, i), "") != 0))
 346             return 0;
 347           range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i));
 348           if ((i > TYPE_N_BASECLASSES (type))
 349               && previous_high + 1 != TYPE_LOW_BOUND (range))
 350             return 0;
 351           previous_high = TYPE_HIGH_BOUND (range);
 352         }
 353       return len>0;
 354     }
 355   return 0;
 356 }
 357
 358 /*
 359  *  m2_get_discrete_bounds - a wrapper for get_discrete_bounds which
 360  *                           understands that CHARs might be signed.
 361  *                           This should be integrated into gdbtypes.c
 362  *                           inside get_discrete_bounds.
 363  */
 364
 365 int
 366 m2_get_discrete_bounds (struct type *type, LONGEST *lowp, LONGEST *highp)
 367 {
 368   CHECK_TYPEDEF (type);
 369   switch (TYPE_CODE (type))
 370     {
 371     case TYPE_CODE_CHAR:
 372       if (TYPE_LENGTH (type) < sizeof (LONGEST))
 373         {
 374           if (!TYPE_UNSIGNED (type))
 375             {
 376               *lowp = -(1 << (TYPE_LENGTH (type) * TARGET_CHAR_BIT - 1));
 377               *highp = -*lowp - 1;
 378               return 0;
 379             }
 380         }
 381       /* fall through */
 382     default:
 383       return get_discrete_bounds (type, lowp, highp);
 384     }
 385 }
 386
 387 /*
 388  *  m2_is_long_set_of_type - returns TRUE if the long set was declared as
 389  *                           SET OF <oftype> of_type is assigned to the
 390  *                           subtype.
 391  */
 392
 393 int
 394 m2_is_long_set_of_type (struct type *type, struct type **of_type)
 395 {
 396   int len, i;
 397   struct type *range;
 398   struct type *target;
 399   LONGEST l1, l2;
 400   LONGEST h1, h2;
 401
 402   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
 403     {
 404       len = TYPE_NFIELDS (type);
 405       i = TYPE_N_BASECLASSES (type);
 406       if (len == 0)
 407         return 0;
 408       range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i));
 409       target = TYPE_TARGET_TYPE (range);
 410       if (target == NULL)
 411         target = builtin_type_int;
 412
 413       l1 = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
 414       h1 = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, len-1)));
 415       *of_type = target;
 416       if (m2_get_discrete_bounds (target, &l2, &h2) >= 0)
 417         return (l1 == l2 && h1 == h2);
 418       error (_("long_set failed to find discrete bounds for its subtype"));
 419       return 0;
 420     }
 421   error (_("expecting long_set"));
 422   return 0;
 423 }
 424
 425 static int
 426 m2_long_set (struct type *type, struct ui_file *stream, int show, int level)
 427 {
 428   struct type *index_type;
 429   struct type *range_type;
 430   struct type *of_type;
 431   int i;
 432   int len = TYPE_NFIELDS (type);
 433   LONGEST low;
 434   LONGEST high;
 435
 436   if (m2_is_long_set (type))
 437     {
 438       if (TYPE_TAG_NAME (type) != NULL)
 439         {
 440           fputs_filtered (TYPE_TAG_NAME (type), stream);
 441           if (show == 0)
 442             return 1;
 443         }
 444       else if (TYPE_NAME (type) != NULL)
 445         {
 446           fputs_filtered (TYPE_NAME (type), stream);
 447           if (show == 0)
 448             return 1;
 449         }
 450
 451       if (TYPE_TAG_NAME (type) != NULL || TYPE_NAME (type) != NULL)
 452         fputs_filtered (" = ", stream);
 453
 454       if (get_long_set_bounds (type, &low, &high))
 455         {
 456           fprintf_filtered(stream, "SET OF ");
 457           i = TYPE_N_BASECLASSES (type);
 458           if (m2_is_long_set_of_type (type, &of_type))
 459             m2_print_type (of_type, "", stream, show - 1, level);
 460           else
 461             {
 462               fprintf_filtered(stream, "[");
 463               m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)),
 464                                stream, show - 1, level, 0);
 465
 466               fprintf_filtered(stream, "..");
 467
 468               m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, len-1)),
 469                                stream, show - 1, level, 1);
 470               fprintf_filtered(stream, "]");
 471             }
 472         }
 473       else
 474         /* i18n: Do not translate the "SET OF" part! */
 475         fprintf_filtered(stream, _("SET OF <unknown>"));
 476
 477       return 1;
 478     }
 479   return 0;
 480 }
 481
 482 void
 483 m2_record_fields (struct type *type, struct ui_file *stream, int show,
 484                   int level)
 485 {
 486   /* Print the tag if it exists.
 487    */
 488   if (TYPE_TAG_NAME (type) != NULL)
 489     {
 490       if (strncmp (TYPE_TAG_NAME (type), "$$", 2) != 0)
 491         {
 492           fputs_filtered (TYPE_TAG_NAME (type), stream);
 493           if (show > 0)
 494             fprintf_filtered (stream, " = ");
 495         }
 496     }
 497   wrap_here ("    ");
 498   if (show < 0)
 499     {
 500       if (TYPE_CODE (type) == DECLARED_TYPE_STRUCT)
 501         fprintf_filtered (stream, "RECORD ... END ");
 502       else if (TYPE_DECLARED_TYPE (type) == DECLARED_TYPE_UNION)
 503         fprintf_filtered (stream, "CASE ... END ");
 504     }
 505   else if (show > 0)
 506     {
 507       int i;
 508       int len = TYPE_NFIELDS (type);
 509
 510       if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
 511         fprintf_filtered (stream, "RECORD\n");
 512       else if (TYPE_CODE (type) == TYPE_CODE_UNION)
 513         /* i18n: Do not translate "CASE" and "OF" */
 514         fprintf_filtered (stream, _("CASE <variant> OF\n"));
 515
 516       for (i = TYPE_N_BASECLASSES (type); i < len; i++)
 517         {
 518           QUIT;
 519
 520           print_spaces_filtered (level + 4, stream);
 521           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 522           fputs_filtered (" : ", stream);
 523           m2_print_type (TYPE_FIELD_TYPE (type, i),
 524                          "",
 525                          stream, 0, level + 4);
 526           if (TYPE_FIELD_PACKED (type, i))
 527             {
 528               /* It is a bitfield.  This code does not attempt
 529                  to look at the bitpos and reconstruct filler,
 530                  unnamed fields.  This would lead to misleading
 531                  results if the compiler does not put out fields
 532                  for such things (I don't know what it does).  */
 533               fprintf_filtered (stream, " : %d",
 534                                 TYPE_FIELD_BITSIZE (type, i));
 535             }
 536           fprintf_filtered (stream, ";\n");
 537         }
 538
 539       fprintfi_filtered (level, stream, "END ");
 540     }
 541 }
 542
 543 void
 544 m2_enum (struct type *type, struct ui_file *stream, int show, int level)
 545 {
 546   int lastval, i, len;
 547
 548   if (show < 0)
 549     {
 550       /* If we just printed a tag name, no need to print anything else.  */
 551       if (TYPE_TAG_NAME (type) == NULL)
 552         fprintf_filtered (stream, "(...)");
 553     }
 554   else if (show > 0 || TYPE_TAG_NAME (type) == NULL)
 555     {
 556       fprintf_filtered (stream, "(");
 557       len = TYPE_NFIELDS (type);
 558       lastval = 0;
 559       for (i = 0; i < len; i++)
 560         {
 561           QUIT;
 562           if (i > 0)
 563             fprintf_filtered (stream, ", ");
 564           wrap_here ("    ");
 565           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 566           if (lastval != TYPE_FIELD_BITPOS (type, i))
 567             {
 568               fprintf_filtered (stream, " = %d", TYPE_FIELD_BITPOS (type, i));
 569               lastval = TYPE_FIELD_BITPOS (type, i);
 570             }
 571           lastval++;
 572         }
 573       fprintf_filtered (stream, ")");
 574     }
 575 }