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
  32 static void
  33 chill_print_value_fields PARAMS ((struct type *, char *, GDB_FILE *, int, int,
  34                                   enum val_prettyprint, struct type **));
  35
  36 \f
  37 /* Print data of type TYPE located at VALADDR (within GDB), which came from
  38    the inferior at address ADDRESS, onto stdio stream STREAM according to
  39    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
  40    target byte order.
  41
  42    If the data are a string pointer, returns the number of string characters
  43    printed.
  44
  45    If DEREF_REF is nonzero, then dereference references, otherwise just print
  46    them like pointers.
  47
  48    The PRETTY parameter controls prettyprinting.  */
  49
  50 int
  51 chill_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
  52                  pretty)
  53      struct type *type;
  54      char *valaddr;
  55      CORE_ADDR address;
  56      GDB_FILE *stream;
  57      int format;
  58      int deref_ref;
  59      int recurse;
  60      enum val_prettyprint pretty;
  61 {
  62   LONGEST val;
  63   unsigned int i = 0;           /* Number of characters printed.  */
  64   struct type *elttype;
  65   CORE_ADDR addr;
  66
  67   switch (TYPE_CODE (type))
  68     {
  69     case TYPE_CODE_ARRAY:
  70       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
  71         {
  72           if (prettyprint_arrays)
  73             {
  74               print_spaces_filtered (2 + 2 * recurse, stream);
  75             }
  76           fprintf_filtered (stream, "[");
  77           val_print_array_elements (type, valaddr, address, stream, format,
  78                                     deref_ref, recurse, pretty, 0);
  79           fprintf_filtered (stream, "]");
  80         }
  81       else
  82         {
  83           error ("unimplemented in chill_val_print; unspecified array length");
  84         }
  85       break;
  86
  87     case TYPE_CODE_INT:
  88       format = format ? format : output_format;
  89       if (format)
  90         {
  91           print_scalar_formatted (valaddr, type, format, 0, stream);
  92         }
  93       else
  94         {
  95           val_print_type_code_int (type, valaddr, stream);
  96         }
  97       break;
  98
  99     case TYPE_CODE_CHAR:
 100       format = format ? format : output_format;
 101       if (format)
 102         {
 103           print_scalar_formatted (valaddr, type, format, 0, stream);
 104         }
 105       else
 106         {
 107           LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
 108                          stream);
 109         }
 110       break;
 111
 112     case TYPE_CODE_FLT:
 113       if (format)
 114         {
 115           print_scalar_formatted (valaddr, type, format, 0, stream);
 116         }
 117       else
 118         {
 119           print_floating (valaddr, type, stream);
 120         }
 121       break;
 122
 123     case TYPE_CODE_BOOL:
 124       format = format ? format : output_format;
 125       if (format)
 126         {
 127           print_scalar_formatted (valaddr, type, format, 0, stream);
 128         }
 129       else
 130         {
 131           val = unpack_long (builtin_type_chill_bool, valaddr);
 132           fprintf_filtered (stream, val ? "TRUE" : "FALSE");
 133         }
 134       break;
 135
 136     case TYPE_CODE_UNDEF:
 137       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 138          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 139          and no complete type for struct foo in that file.  */
 140       fprintf_filtered (stream, "<incomplete type>");
 141       break;
 142
 143     case TYPE_CODE_PTR:
 144       if (format && format != 's')
 145         {
 146           print_scalar_formatted (valaddr, type, format, 0, stream);
 147           break;
 148         }
 149       addr = unpack_pointer (type, valaddr);
 150       elttype = TYPE_TARGET_TYPE (type);
 151
 152       if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 153         {
 154           /* Try to print what function it points to.  */
 155           print_address_demangle (addr, stream, demangle);
 156           /* Return value is irrelevant except for string pointers.  */
 157           return (0);
 158         }
 159       if (addressprint && format != 's')
 160         {
 161           fprintf_filtered (stream, "H'%lx", (unsigned long) addr);
 162         }
 163
 164       /* For a pointer to char or unsigned char, also print the string
 165          pointed to, unless pointer is null.  */
 166       if (TYPE_LENGTH (elttype) == 1
 167           && TYPE_CODE (elttype) == TYPE_CODE_CHAR
 168           && (format == 0 || format == 's')
 169           && addr != 0
 170           && /* If print_max is UINT_MAX, the alloca below will fail.
 171                 In that case don't try to print the string.  */
 172           print_max < UINT_MAX)
 173           {
 174             i = val_print_string (addr, 0, stream);
 175           }
 176       /* Return number of characters printed, plus one for the
 177          terminating null if we have "reached the end".  */
 178       return (i + (print_max && i != print_max));
 179       break;
 180
 181     case TYPE_CODE_STRING:
 182       if (format && format != 's')
 183         {
 184           print_scalar_formatted (valaddr, type, format, 0, stream);
 185           break;
 186         }
 187       i = TYPE_LENGTH (type);
 188       LA_PRINT_STRING (stream, valaddr, i, 0);
 189       /* Return number of characters printed, plus one for the terminating
 190          null if we have "reached the end".  */
 191       return (i + (print_max && i != print_max));
 192       break;
 193
 194     case TYPE_CODE_BITSTRING:
 195     case TYPE_CODE_SET:
 196       {
 197         struct type *range = TYPE_FIELD_TYPE (type, 0);
 198         int low_bound = TYPE_LOW_BOUND (range);
 199         int high_bound = TYPE_HIGH_BOUND (range);
 200         int i;
 201         int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 202         int need_comma = 0;
 203         int in_range = 0;
 204
 205         if (is_bitstring)
 206           fputs_filtered ("B'", stream);
 207         else
 208           fputs_filtered ("[", stream);
 209         for (i = low_bound; i <= high_bound; i++)
 210           {
 211             int element = value_bit_index (type, valaddr, i);
 212             if (is_bitstring)
 213               fprintf_filtered (stream, "%d", element);
 214             else if (element)
 215               {
 216                 if (need_comma)
 217                   fputs_filtered (", ", stream);
 218                 print_type_scalar (TYPE_TARGET_TYPE (range), i, stream);
 219                 need_comma = 1;
 220
 221                 /* Look for a continuous range of true elements. */
 222                 if (i+1 <= high_bound && value_bit_index (type, valaddr, ++i))
 223                   {
 224                     int j = i; /* j is the upper bound so far of the range */
 225                     fputs_filtered (":", stream);
 226                     while (i+1 <= high_bound
 227                            && value_bit_index (type, valaddr, ++i))
 228                       j = i;
 229                     print_type_scalar (TYPE_TARGET_TYPE (range), j, stream);
 230                   }
 231               }
 232           }
 233         if (is_bitstring)
 234           fputs_filtered ("'", stream);
 235         else
 236           fputs_filtered ("]", stream);
 237       }
 238       break;
 239
 240     case TYPE_CODE_STRUCT:
 241       if (chill_is_varying_struct (type))
 242         {
 243           struct type *inner = TYPE_FIELD_TYPE (type, 1);
 244           long length = unpack_long (TYPE_FIELD_TYPE (type, 0), valaddr);
 245           char *data_addr = valaddr + TYPE_FIELD_BITPOS (type, 1) / 8;
 246
 247           switch (TYPE_CODE (inner))
 248             {
 249             case TYPE_CODE_STRING:
 250               if (length > TYPE_LENGTH (type))
 251                 {
 252                   fprintf_filtered (stream,
 253                                     "<dynamic length %d > static length %d>",
 254                                     length, TYPE_LENGTH (type));
 255                   length > TYPE_LENGTH (type);
 256                 }
 257               LA_PRINT_STRING (stream, data_addr, length, 0);
 258               return length;
 259             }
 260         }
 261       chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 262                                 0);
 263       break;
 264
 265     case TYPE_CODE_REF:
 266       if (addressprint)
 267         {
 268           fprintf_filtered (stream, "LOC(H'%lx)",
 269               extract_unsigned_integer (valaddr,
 270                                         TARGET_PTR_BIT / HOST_CHAR_BIT));
 271           if (deref_ref)
 272             fputs_filtered (": ", stream);
 273         }
 274       /* De-reference the reference.  */
 275       if (deref_ref)
 276         {
 277           if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
 278             {
 279               value deref_val =
 280                 value_at
 281                   (TYPE_TARGET_TYPE (type),
 282                    unpack_pointer (lookup_pointer_type (builtin_type_void),
 283                                    valaddr));
 284               val_print (VALUE_TYPE (deref_val),
 285                          VALUE_CONTENTS (deref_val),
 286                          VALUE_ADDRESS (deref_val), stream, format,
 287                          deref_ref, recurse + 1, pretty);
 288             }
 289           else
 290             fputs_filtered ("???", stream);
 291         }
 292       break;
 293
 294     case TYPE_CODE_ENUM:
 295       c_val_print (type, valaddr, address, stream, format,
 296                    deref_ref, recurse, pretty);
 297       break;
 298
 299     case TYPE_CODE_RANGE:
 300       if (TYPE_TARGET_TYPE (type))
 301         chill_val_print (TYPE_TARGET_TYPE (type), valaddr, address, stream,
 302                          format, deref_ref, recurse, pretty);
 303       break;
 304
 305     case TYPE_CODE_MEMBER:
 306     case TYPE_CODE_UNION:
 307     case TYPE_CODE_FUNC:
 308     case TYPE_CODE_VOID:
 309     case TYPE_CODE_ERROR:
 310     default:
 311       /* Let's defer printing to the C printer, rather than
 312          print an error message.  FIXME! */
 313       c_val_print (type, valaddr, address, stream, format,
 314                    deref_ref, recurse, pretty);
 315     }
 316   gdb_flush (stream);
 317   return (0);
 318 }
 319
 320 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
 321    print out a structure's fields: cp_print_value_fields and cplus_print_value.
 322
 323    TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
 324    same meanings as in cplus_print_value and c_val_print.
 325
 326    DONT_PRINT is an array of baseclass types that we
 327    should not print, or zero if called from top level.  */
 328
 329 static void
 330 chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 331                           dont_print)
 332      struct type *type;
 333      char *valaddr;
 334      GDB_FILE *stream;
 335      int format;
 336      int recurse;
 337      enum val_prettyprint pretty;
 338      struct type **dont_print;
 339 {
 340   int i, len;
 341   int fields_seen = 0;
 342
 343   check_stub_type (type);
 344
 345   fprintf_filtered (stream, "[");
 346   len = TYPE_NFIELDS (type);
 347   if (len == 0)
 348     {
 349       fprintf_filtered (stream, "<No data fields>");
 350     }
 351   else
 352     {
 353       for (i = 0; i < len; i++)
 354         {
 355           if (fields_seen)
 356             {
 357               fprintf_filtered (stream, ", ");
 358             }
 359           fields_seen = 1;
 360           if (pretty)
 361             {
 362               fprintf_filtered (stream, "\n");
 363               print_spaces_filtered (2 + 2 * recurse, stream);
 364             }
 365           else
 366             {
 367               wrap_here (n_spaces (2 + 2 * recurse));
 368             }
 369           fputs_filtered (".", stream);
 370           fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 371                                    language_chill, DMGL_NO_OPTS);
 372           fputs_filtered (": ", stream);
 373           if (TYPE_FIELD_PACKED (type, i))
 374             {
 375               value v;
 376
 377               /* Bitfields require special handling, especially due to byte
 378                  order problems.  */
 379               v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 380                                       unpack_field_as_long (type, valaddr, i));
 381
 382               chill_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 383                                stream, format, 0, recurse + 1, pretty);
 384             }
 385           else
 386             {
 387               chill_val_print (TYPE_FIELD_TYPE (type, i),
 388                                valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 389                                0, stream, format, 0, recurse + 1, pretty);
 390             }
 391         }
 392       if (pretty)
 393         {
 394           fprintf_filtered (stream, "\n");
 395           print_spaces_filtered (2 * recurse, stream);
 396         }
 397     }
 398   fprintf_filtered (stream, "]");
 399 }