gdb/ch-valprint.c

   1 /* Support for printing Chill values for GDB, the GNU debugger.
   2    Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994
   3    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 2 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, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "defs.h"
  22 #include "obstack.h"
  23 #include "symtab.h"
  24 #include "gdbtypes.h"
  25 #include "valprint.h"
  26 #include "expression.h"
  27 #include "value.h"
  28 #include "language.h"
  29 #include "demangle.h"
  30 #include "c-lang.h" /* For c_val_print */
  31 #include "typeprint.h"
  32 #include "ch-lang.h"
  33
  34 static void
  35 chill_print_value_fields PARAMS ((struct type *, char *, GDB_FILE *, int, int,
  36                                   enum val_prettyprint, struct type **));
  37
  38 \f
  39 /* Print the elements of an array.
  40    Similar to val_print_array_elements, but prints
  41    element indexes (in Chill syntax). */
  42
  43 static void
  44 chill_val_print_array_elements (type, valaddr, address, stream,
  45                                 format, deref_ref, recurse, pretty)
  46      struct type *type;
  47      char *valaddr;
  48      CORE_ADDR address;
  49      GDB_FILE *stream;
  50      int format;
  51      int deref_ref;
  52      int recurse;
  53      enum val_prettyprint pretty;
  54 {
  55   unsigned int i = 0;
  56   unsigned int things_printed = 0;
  57   unsigned len;
  58   struct type *elttype;
  59   struct type *range_type = TYPE_FIELD_TYPE (type, 0);
  60   struct type *index_type = TYPE_TARGET_TYPE (range_type);
  61   unsigned eltlen;
  62   /* Position of the array element we are examining to see
  63      whether it is repeated.  */
  64   unsigned int rep1;
  65   /* Number of repetitions we have detected so far.  */
  66   unsigned int reps;
  67   LONGEST low_bound =  TYPE_FIELD_BITPOS (range_type, 0);
  68   LONGEST high_bound = TYPE_FIELD_BITPOS (range_type, 1);
  69
  70   elttype = TYPE_TARGET_TYPE (type);
  71   eltlen = TYPE_LENGTH (elttype);
  72   len = TYPE_LENGTH (type) / eltlen;
  73
  74   annotate_array_section_begin (i, elttype);
  75
  76   for (; i < len && things_printed < print_max; i++)
  77     {
  78       if (i != 0)
  79         {
  80           if (prettyprint_arrays)
  81             {
  82               fprintf_filtered (stream, ",\n");
  83               print_spaces_filtered (2 + 2 * recurse, stream);
  84             }
  85           else
  86             {
  87               fprintf_filtered (stream, ", ");
  88             }
  89         }
  90       wrap_here (n_spaces (2 + 2 * recurse));
  91
  92       rep1 = i + 1;
  93       reps = 1;
  94       while ((rep1 < len) &&
  95              !memcmp (valaddr + i * eltlen, valaddr + rep1 * eltlen, eltlen))
  96         {
  97           ++reps;
  98           ++rep1;
  99         }
 100
 101       fputs_filtered ("(", stream);
 102       print_type_scalar (index_type, low_bound + i, stream);
 103       if (reps > 1)
 104         {
 105           fputs_filtered (":", stream);
 106           print_type_scalar (index_type, low_bound + i + reps - 1, stream);
 107           fputs_filtered ("): ", stream);
 108           val_print (elttype, valaddr + i * eltlen, 0, stream, format,
 109                      deref_ref, recurse + 1, pretty);
 110
 111           i = rep1 - 1;
 112           things_printed += 1;
 113         }
 114       else
 115         {
 116           fputs_filtered ("): ", stream);
 117           val_print (elttype, valaddr + i * eltlen, 0, stream, format,
 118                      deref_ref, recurse + 1, pretty);
 119           annotate_elt ();
 120           things_printed++;
 121         }
 122     }
 123   annotate_array_section_end ();
 124   if (i < len)
 125     {
 126       fprintf_filtered (stream, "...");
 127     }
 128 }
 129
 130 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 131    the inferior at address ADDRESS, onto stdio stream STREAM according to
 132    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
 133    target byte order.
 134
 135    If the data are a string pointer, returns the number of string characters
 136    printed.
 137
 138    If DEREF_REF is nonzero, then dereference references, otherwise just print
 139    them like pointers.
 140
 141    The PRETTY parameter controls prettyprinting.  */
 142
 143 int
 144 chill_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
 145                  pretty)
 146      struct type *type;
 147      char *valaddr;
 148      CORE_ADDR address;
 149      GDB_FILE *stream;
 150      int format;
 151      int deref_ref;
 152      int recurse;
 153      enum val_prettyprint pretty;
 154 {
 155   LONGEST val;
 156   unsigned int i = 0;           /* Number of characters printed.  */
 157   struct type *elttype;
 158   CORE_ADDR addr;
 159
 160   switch (TYPE_CODE (type))
 161     {
 162     case TYPE_CODE_ARRAY:
 163       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 164         {
 165           if (prettyprint_arrays)
 166             {
 167               print_spaces_filtered (2 + 2 * recurse, stream);
 168             }
 169           fprintf_filtered (stream, "[");
 170           chill_val_print_array_elements (type, valaddr, address, stream,
 171                                           format, deref_ref, recurse, pretty);
 172           fprintf_filtered (stream, "]");
 173         }
 174       else
 175         {
 176           error ("unimplemented in chill_val_print; unspecified array length");
 177         }
 178       break;
 179
 180     case TYPE_CODE_INT:
 181       format = format ? format : output_format;
 182       if (format)
 183         {
 184           print_scalar_formatted (valaddr, type, format, 0, stream);
 185         }
 186       else
 187         {
 188           val_print_type_code_int (type, valaddr, stream);
 189         }
 190       break;
 191
 192     case TYPE_CODE_CHAR:
 193       format = format ? format : output_format;
 194       if (format)
 195         {
 196           print_scalar_formatted (valaddr, type, format, 0, stream);
 197         }
 198       else
 199         {
 200           LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
 201                          stream);
 202         }
 203       break;
 204
 205     case TYPE_CODE_FLT:
 206       if (format)
 207         {
 208           print_scalar_formatted (valaddr, type, format, 0, stream);
 209         }
 210       else
 211         {
 212           print_floating (valaddr, type, stream);
 213         }
 214       break;
 215
 216     case TYPE_CODE_BOOL:
 217       format = format ? format : output_format;
 218       if (format)
 219         {
 220           print_scalar_formatted (valaddr, type, format, 0, stream);
 221         }
 222       else
 223         {
 224           /* FIXME: Why is this using builtin_type_chill_bool not type?  */
 225           val = unpack_long (builtin_type_chill_bool, valaddr);
 226           fprintf_filtered (stream, val ? "TRUE" : "FALSE");
 227         }
 228       break;
 229
 230     case TYPE_CODE_UNDEF:
 231       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 232          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 233          and no complete type for struct foo in that file.  */
 234       fprintf_filtered (stream, "<incomplete type>");
 235       break;
 236
 237     case TYPE_CODE_PTR:
 238       if (format && format != 's')
 239         {
 240           print_scalar_formatted (valaddr, type, format, 0, stream);
 241           break;
 242         }
 243       addr = unpack_pointer (type, valaddr);
 244       elttype = TYPE_TARGET_TYPE (type);
 245
 246       /* We assume a NULL pointer is all zeros ... */
 247       if (addr == 0)
 248         {
 249           fputs_filtered ("NULL", stream);
 250           return 0;
 251         }
 252
 253       if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 254         {
 255           /* Try to print what function it points to.  */
 256           print_address_demangle (addr, stream, demangle);
 257           /* Return value is irrelevant except for string pointers.  */
 258           return (0);
 259         }
 260       if (addressprint && format != 's')
 261         {
 262           print_address_numeric (addr, 1, stream);
 263         }
 264
 265       /* For a pointer to char or unsigned char, also print the string
 266          pointed to, unless pointer is null.  */
 267       if (TYPE_LENGTH (elttype) == 1
 268           && TYPE_CODE (elttype) == TYPE_CODE_CHAR
 269           && (format == 0 || format == 's')
 270           && addr != 0
 271           && /* If print_max is UINT_MAX, the alloca below will fail.
 272                 In that case don't try to print the string.  */
 273           print_max < UINT_MAX)
 274           {
 275             i = val_print_string (addr, 0, stream);
 276           }
 277       /* Return number of characters printed, plus one for the
 278          terminating null if we have "reached the end".  */
 279       return (i + (print_max && i != print_max));
 280       break;
 281
 282     case TYPE_CODE_STRING:
 283       if (format && format != 's')
 284         {
 285           print_scalar_formatted (valaddr, type, format, 0, stream);
 286           break;
 287         }
 288       i = TYPE_LENGTH (type);
 289       LA_PRINT_STRING (stream, valaddr, i, 0);
 290       /* Return number of characters printed, plus one for the terminating
 291          null if we have "reached the end".  */
 292       return (i + (print_max && i != print_max));
 293       break;
 294
 295     case TYPE_CODE_BITSTRING:
 296     case TYPE_CODE_SET:
 297       elttype = TYPE_FIELD_TYPE (type, 0);
 298       check_stub_type (elttype);
 299       if (TYPE_FLAGS (elttype) & TYPE_FLAG_STUB)
 300         {
 301           fprintf_filtered (stream, "<incomplete type>");
 302           gdb_flush (stream);
 303           break;
 304         }
 305       {
 306         struct type *range = elttype;
 307         int low_bound = TYPE_LOW_BOUND (range);
 308         int high_bound = TYPE_HIGH_BOUND (range);
 309         int i;
 310         int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 311         int need_comma = 0;
 312
 313         if (is_bitstring)
 314           fputs_filtered ("B'", stream);
 315         else
 316           fputs_filtered ("[", stream);
 317         for (i = low_bound; i <= high_bound; i++)
 318           {
 319             int element = value_bit_index (type, valaddr, i);
 320             if (is_bitstring)
 321               fprintf_filtered (stream, "%d", element);
 322             else if (element)
 323               {
 324                 if (need_comma)
 325                   fputs_filtered (", ", stream);
 326                 print_type_scalar (TYPE_TARGET_TYPE (range), i, stream);
 327                 need_comma = 1;
 328
 329                 /* Look for a continuous range of true elements. */
 330                 if (i+1 <= high_bound && value_bit_index (type, valaddr, ++i))
 331                   {
 332                     int j = i; /* j is the upper bound so far of the range */
 333                     fputs_filtered (":", stream);
 334                     while (i+1 <= high_bound
 335                            && value_bit_index (type, valaddr, ++i))
 336                       j = i;
 337                     print_type_scalar (TYPE_TARGET_TYPE (range), j, stream);
 338                   }
 339               }
 340           }
 341         if (is_bitstring)
 342           fputs_filtered ("'", stream);
 343         else
 344           fputs_filtered ("]", stream);
 345       }
 346       break;
 347
 348     case TYPE_CODE_STRUCT:
 349       if (chill_is_varying_struct (type))
 350         {
 351           struct type *inner = TYPE_FIELD_TYPE (type, 1);
 352           long length = unpack_long (TYPE_FIELD_TYPE (type, 0), valaddr);
 353           char *data_addr = valaddr + TYPE_FIELD_BITPOS (type, 1) / 8;
 354
 355           switch (TYPE_CODE (inner))
 356             {
 357             case TYPE_CODE_STRING:
 358               if (length > TYPE_LENGTH (type))
 359                 {
 360                   fprintf_filtered (stream,
 361                                     "<dynamic length %d > static length %d>",
 362                                     length, TYPE_LENGTH (type));
 363                 }
 364               LA_PRINT_STRING (stream, data_addr, length, 0);
 365               return length;
 366             default:
 367               break;
 368             }
 369         }
 370       chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 371                                 0);
 372       break;
 373
 374     case TYPE_CODE_REF:
 375       if (addressprint)
 376         {
 377           fprintf_filtered (stream, "LOC(");
 378           print_address_numeric
 379             (extract_address (valaddr, TARGET_PTR_BIT / HOST_CHAR_BIT),
 380              1,
 381              stream);
 382           fprintf_filtered (stream, ")");
 383           if (deref_ref)
 384             fputs_filtered (": ", stream);
 385         }
 386       /* De-reference the reference.  */
 387       if (deref_ref)
 388         {
 389           if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
 390             {
 391               value_ptr deref_val =
 392                 value_at
 393                   (TYPE_TARGET_TYPE (type),
 394                    unpack_pointer (lookup_pointer_type (builtin_type_void),
 395                                    valaddr));
 396               val_print (VALUE_TYPE (deref_val),
 397                          VALUE_CONTENTS (deref_val),
 398                          VALUE_ADDRESS (deref_val), stream, format,
 399                          deref_ref, recurse + 1, pretty);
 400             }
 401           else
 402             fputs_filtered ("???", stream);
 403         }
 404       break;
 405
 406     case TYPE_CODE_ENUM:
 407       c_val_print (type, valaddr, address, stream, format,
 408                    deref_ref, recurse, pretty);
 409       break;
 410
 411     case TYPE_CODE_RANGE:
 412       if (TYPE_TARGET_TYPE (type))
 413         chill_val_print (TYPE_TARGET_TYPE (type), valaddr, address, stream,
 414                          format, deref_ref, recurse, pretty);
 415       break;
 416
 417     case TYPE_CODE_MEMBER:
 418     case TYPE_CODE_UNION:
 419     case TYPE_CODE_FUNC:
 420     case TYPE_CODE_VOID:
 421     case TYPE_CODE_ERROR:
 422     default:
 423       /* Let's defer printing to the C printer, rather than
 424          print an error message.  FIXME! */
 425       c_val_print (type, valaddr, address, stream, format,
 426                    deref_ref, recurse, pretty);
 427     }
 428   gdb_flush (stream);
 429   return (0);
 430 }
 431
 432 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
 433    print out a structure's fields: cp_print_value_fields and cplus_print_value.
 434
 435    TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
 436    same meanings as in cplus_print_value and c_val_print.
 437
 438    DONT_PRINT is an array of baseclass types that we
 439    should not print, or zero if called from top level.  */
 440
 441 static void
 442 chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 443                           dont_print)
 444      struct type *type;
 445      char *valaddr;
 446      GDB_FILE *stream;
 447      int format;
 448      int recurse;
 449      enum val_prettyprint pretty;
 450      struct type **dont_print;
 451 {
 452   int i, len;
 453   int fields_seen = 0;
 454
 455   check_stub_type (type);
 456
 457   fprintf_filtered (stream, "[");
 458   len = TYPE_NFIELDS (type);
 459   if (len == 0)
 460     {
 461       fprintf_filtered (stream, "<No data fields>");
 462     }
 463   else
 464     {
 465       for (i = 0; i < len; i++)
 466         {
 467           if (fields_seen)
 468             {
 469               fprintf_filtered (stream, ", ");
 470             }
 471           fields_seen = 1;
 472           if (pretty)
 473             {
 474               fprintf_filtered (stream, "\n");
 475               print_spaces_filtered (2 + 2 * recurse, stream);
 476             }
 477           else
 478             {
 479               wrap_here (n_spaces (2 + 2 * recurse));
 480             }
 481           fputs_filtered (".", stream);
 482           fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 483                                    language_chill, DMGL_NO_OPTS);
 484           fputs_filtered (": ", stream);
 485           if (TYPE_FIELD_PACKED (type, i))
 486             {
 487               value_ptr v;
 488
 489               /* Bitfields require special handling, especially due to byte
 490                  order problems.  */
 491               v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 492                                       unpack_field_as_long (type, valaddr, i));
 493
 494               chill_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 495                                stream, format, 0, recurse + 1, pretty);
 496             }
 497           else
 498             {
 499               chill_val_print (TYPE_FIELD_TYPE (type, i),
 500                                valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 501                                0, stream, format, 0, recurse + 1, pretty);
 502             }
 503         }
 504       if (pretty)
 505         {
 506           fprintf_filtered (stream, "\n");
 507           print_spaces_filtered (2 * recurse, stream);
 508         }
 509     }
 510   fprintf_filtered (stream, "]");
 511 }
 512 \f
 513 int
 514 chill_value_print (val, stream, format, pretty)
 515      value_ptr val;
 516      GDB_FILE *stream;
 517      int format;
 518      enum val_prettyprint pretty;
 519 {
 520   /* A "repeated" value really contains several values in a row.
 521      They are made by the @ operator.
 522      Print such values as if they were arrays.  */
 523
 524   if (VALUE_REPEATED (val))
 525     {
 526       register unsigned int n = VALUE_REPETITIONS (val);
 527       register unsigned int typelen = TYPE_LENGTH (VALUE_TYPE (val));
 528       fprintf_filtered (stream, "[");
 529       /* Print arrays of characters using string syntax.  */
 530       if (typelen == 1 && TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_INT
 531           && format == 0)
 532         LA_PRINT_STRING (stream, VALUE_CONTENTS (val), n, 0);
 533       else
 534         {
 535           value_print_array_elements (val, stream, format, pretty);
 536         }
 537       fprintf_filtered (stream, "]");
 538       return (n * typelen);
 539     }
 540   else
 541     {
 542       struct type *type = VALUE_TYPE (val);
 543
 544       /* If it is a pointer, indicate what it points to.
 545
 546          Print type also if it is a reference.
 547
 548          C++: if it is a member pointer, we will take care
 549          of that when we print it.  */
 550       if (TYPE_CODE (type) == TYPE_CODE_PTR ||
 551           TYPE_CODE (type) == TYPE_CODE_REF)
 552         {
 553           char *valaddr = VALUE_CONTENTS (val);
 554           CORE_ADDR addr = unpack_pointer (type, valaddr);
 555           if (TYPE_CODE (type) != TYPE_CODE_PTR || addr != 0)
 556             {
 557               int i;
 558               char *name = TYPE_NAME (type);
 559               if (name)
 560                 fputs_filtered (name, stream);
 561               else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_VOID)
 562                 fputs_filtered ("PTR", stream);
 563               else
 564                 {
 565                   fprintf_filtered (stream, "(");
 566                   type_print (type, "", stream, -1);
 567                   fprintf_filtered (stream, ")");
 568                 }
 569               fprintf_filtered (stream, "(");
 570               i = val_print (type, valaddr, VALUE_ADDRESS (val),
 571                              stream, format, 1, 0, pretty);
 572               fprintf_filtered (stream, ")");
 573               return i;
 574             }
 575         }
 576       return (val_print (type, VALUE_CONTENTS (val),
 577                          VALUE_ADDRESS (val), stream, format, 1, 0, pretty));
 578     }
 579 }
 580
 581