gdb/ch-valprint.c

   1 /* Support for printing Chill values for GDB, the GNU debugger.
   2    Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21 #include "obstack.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "valprint.h"
  25 #include "expression.h"
  26 #include "value.h"
  27 #include "language.h"
  28 #include "demangle.h"
  29 #include "c-lang.h" /* For c_val_print */
  30
  31 static void
  32 chill_print_value_fields PARAMS ((struct type *, char *, GDB_FILE *, int, int,
  33                                   enum val_prettyprint, struct type **));
  34
  35 \f
  36 /* Print data of type TYPE located at VALADDR (within GDB), which came from
  37    the inferior at address ADDRESS, onto stdio stream STREAM according to
  38    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
  39    target byte order.
  40
  41    If the data are a string pointer, returns the number of string characters
  42    printed.
  43
  44    If DEREF_REF is nonzero, then dereference references, otherwise just print
  45    them like pointers.
  46
  47    The PRETTY parameter controls prettyprinting.  */
  48
  49 int
  50 chill_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
  51                  pretty)
  52      struct type *type;
  53      char *valaddr;
  54      CORE_ADDR address;
  55      GDB_FILE *stream;
  56      int format;
  57      int deref_ref;
  58      int recurse;
  59      enum val_prettyprint pretty;
  60 {
  61   LONGEST val;
  62   unsigned int i = 0;           /* Number of characters printed.  */
  63   struct type *elttype;
  64   CORE_ADDR addr;
  65
  66   switch (TYPE_CODE (type))
  67     {
  68     case TYPE_CODE_ARRAY:
  69       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
  70         {
  71           if (prettyprint_arrays)
  72             {
  73               print_spaces_filtered (2 + 2 * recurse, stream);
  74             }
  75           fprintf_filtered (stream, "[");
  76           val_print_array_elements (type, valaddr, address, stream, format,
  77                                     deref_ref, recurse, pretty, 0);
  78           fprintf_filtered (stream, "]");
  79         }
  80       else
  81         {
  82           error ("unimplemented in chill_val_print; unspecified array length");
  83         }
  84       break;
  85
  86     case TYPE_CODE_INT:
  87       format = format ? format : output_format;
  88       if (format)
  89         {
  90           print_scalar_formatted (valaddr, type, format, 0, stream);
  91         }
  92       else
  93         {
  94           val_print_type_code_int (type, valaddr, stream);
  95         }
  96       break;
  97
  98     case TYPE_CODE_CHAR:
  99       format = format ? format : output_format;
 100       if (format)
 101         {
 102           print_scalar_formatted (valaddr, type, format, 0, stream);
 103         }
 104       else
 105         {
 106           LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
 107                          stream);
 108         }
 109       break;
 110
 111     case TYPE_CODE_FLT:
 112       if (format)
 113         {
 114           print_scalar_formatted (valaddr, type, format, 0, stream);
 115         }
 116       else
 117         {
 118           print_floating (valaddr, type, stream);
 119         }
 120       break;
 121
 122     case TYPE_CODE_BOOL:
 123       format = format ? format : output_format;
 124       if (format)
 125         {
 126           print_scalar_formatted (valaddr, type, format, 0, stream);
 127         }
 128       else
 129         {
 130           val = unpack_long (builtin_type_chill_bool, valaddr);
 131           fprintf_filtered (stream, val ? "TRUE" : "FALSE");
 132         }
 133       break;
 134
 135     case TYPE_CODE_UNDEF:
 136       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 137          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 138          and no complete type for struct foo in that file.  */
 139       fprintf_filtered (stream, "<incomplete type>");
 140       break;
 141
 142     case TYPE_CODE_PTR:
 143       if (format && format != 's')
 144         {
 145           print_scalar_formatted (valaddr, type, format, 0, stream);
 146           break;
 147         }
 148       addr = unpack_pointer (type, valaddr);
 149       elttype = TYPE_TARGET_TYPE (type);
 150
 151       if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 152         {
 153           /* Try to print what function it points to.  */
 154           print_address_demangle (addr, stream, demangle);
 155           /* Return value is irrelevant except for string pointers.  */
 156           return (0);
 157         }
 158       if (addressprint && format != 's')
 159         {
 160           fprintf_filtered (stream, "H'%lx", (unsigned long) addr);
 161         }
 162
 163       /* For a pointer to char or unsigned char, also print the string
 164          pointed to, unless pointer is null.  */
 165       if (TYPE_LENGTH (elttype) == 1
 166           && TYPE_CODE (elttype) == TYPE_CODE_CHAR
 167           && (format == 0 || format == 's')
 168           && addr != 0
 169           && /* If print_max is UINT_MAX, the alloca below will fail.
 170                 In that case don't try to print the string.  */
 171           print_max < UINT_MAX)
 172           {
 173             i = val_print_string (addr, 0, stream);
 174           }
 175       /* Return number of characters printed, plus one for the
 176          terminating null if we have "reached the end".  */
 177       return (i + (print_max && i != print_max));
 178       break;
 179
 180     case TYPE_CODE_STRING:
 181       if (format && format != 's')
 182         {
 183           print_scalar_formatted (valaddr, type, format, 0, stream);
 184           break;
 185         }
 186       if (addressprint && format != 's')
 187         {
 188           /* This used to say `addr', which is unset at this point.
 189              Is `address' what is meant?  */
 190           fprintf_filtered (stream, "H'%lx ", (unsigned long) address);
 191         }
 192       i = TYPE_LENGTH (type);
 193       LA_PRINT_STRING (stream, valaddr, i, 0);
 194       /* Return number of characters printed, plus one for the terminating
 195          null if we have "reached the end".  */
 196       return (i + (print_max && i != print_max));
 197       break;
 198
 199     case TYPE_CODE_SET:
 200       {
 201         struct type *range = TYPE_FIELD_TYPE (type, 0);
 202         int low_bound = TYPE_FIELD_BITPOS (range, 0);
 203         int high_bound = TYPE_FIELD_BITPOS (range, 1);
 204         int i;
 205         int is_bitstring = 0;
 206         int need_comma = 0;
 207         int in_range = 0;
 208
 209         if (is_bitstring)
 210           fputs_filtered ("B'", stream);
 211         else
 212           fputs_filtered ("[", stream);
 213         for (i = low_bound; i <= high_bound; i++)
 214           {
 215             int element = value_bit_index (type, valaddr, i);
 216             if (is_bitstring)
 217               fprintf_filtered (stream, "%d", element);
 218             else if (element)
 219               {
 220                 if (need_comma)
 221                   fputs_filtered (", ", stream);
 222                 print_type_scalar (TYPE_TARGET_TYPE (range), i, stream);
 223                 need_comma = 1;
 224
 225                 /* Look for a continuous range of true elements. */
 226                 if (i+1 <= high_bound && value_bit_index (type, valaddr, ++i))
 227                   {
 228                     int j = i; /* j is the upper bound so far of the range */
 229                     fputs_filtered (":", stream);
 230                     while (i+1 <= high_bound
 231                            && value_bit_index (type, valaddr, ++i))
 232                       j = i;
 233                     print_type_scalar (TYPE_TARGET_TYPE (range), j, stream);
 234                   }
 235               }
 236           }
 237         if (is_bitstring)
 238           fputs_filtered ("'", stream);
 239         else
 240           fputs_filtered ("]", stream);
 241       }
 242       break;
 243
 244     case TYPE_CODE_STRUCT:
 245       chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 246                                 0);
 247       break;
 248
 249     case TYPE_CODE_REF:
 250       if (addressprint)
 251         {
 252           fprintf_filtered (stream, "LOC(H'%lx)",
 253                             unpack_long (builtin_type_int, valaddr));
 254           if (deref_ref)
 255             fputs_filtered (": ", stream);
 256         }
 257       /* De-reference the reference.  */
 258       if (deref_ref)
 259         {
 260           if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
 261             {
 262               value deref_val =
 263                 value_at
 264                   (TYPE_TARGET_TYPE (type),
 265                    unpack_pointer (lookup_pointer_type (builtin_type_void),
 266                                    valaddr));
 267               val_print (VALUE_TYPE (deref_val),
 268                          VALUE_CONTENTS (deref_val),
 269                          VALUE_ADDRESS (deref_val), stream, format,
 270                          deref_ref, recurse + 1, pretty);
 271             }
 272           else
 273             fputs_filtered ("???", stream);
 274         }
 275       break;
 276
 277     case TYPE_CODE_ENUM:
 278       c_val_print (type, valaddr, address, stream, format,
 279                    deref_ref, recurse, pretty);
 280       break;
 281
 282     case TYPE_CODE_RANGE:
 283       if (TYPE_TARGET_TYPE (type))
 284         chill_val_print (TYPE_TARGET_TYPE (type), valaddr, address, stream,
 285                          format, deref_ref, recurse, pretty);
 286       break;
 287
 288     case TYPE_CODE_MEMBER:
 289     case TYPE_CODE_UNION:
 290     case TYPE_CODE_FUNC:
 291     case TYPE_CODE_VOID:
 292     case TYPE_CODE_ERROR:
 293     default:
 294       /* Let's defer printing to the C printer, rather than
 295          print an error message.  FIXME! */
 296       c_val_print (type, valaddr, address, stream, format,
 297                    deref_ref, recurse, pretty);
 298     }
 299   gdb_flush (stream);
 300   return (0);
 301 }
 302
 303 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
 304    print out a structure's fields: cp_print_value_fields and cplus_print_value.
 305
 306    TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
 307    same meanings as in cplus_print_value and c_val_print.
 308
 309    DONT_PRINT is an array of baseclass types that we
 310    should not print, or zero if called from top level.  */
 311
 312 static void
 313 chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 314                           dont_print)
 315      struct type *type;
 316      char *valaddr;
 317      GDB_FILE *stream;
 318      int format;
 319      int recurse;
 320      enum val_prettyprint pretty;
 321      struct type **dont_print;
 322 {
 323   int i, len;
 324   int fields_seen = 0;
 325
 326   check_stub_type (type);
 327
 328   fprintf_filtered (stream, "[");
 329   len = TYPE_NFIELDS (type);
 330   if (len == 0)
 331     {
 332       fprintf_filtered (stream, "<No data fields>");
 333     }
 334   else
 335     {
 336       for (i = 0; i < len; i++)
 337         {
 338           if (fields_seen)
 339             {
 340               fprintf_filtered (stream, ", ");
 341             }
 342           fields_seen = 1;
 343           if (pretty)
 344             {
 345               fprintf_filtered (stream, "\n");
 346               print_spaces_filtered (2 + 2 * recurse, stream);
 347             }
 348           else
 349             {
 350               wrap_here (n_spaces (2 + 2 * recurse));
 351             }
 352           fputs_filtered (".", stream);
 353           fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 354                                    language_chill, DMGL_NO_OPTS);
 355           fputs_filtered (": ", stream);
 356           if (TYPE_FIELD_PACKED (type, i))
 357             {
 358               value v;
 359
 360               /* Bitfields require special handling, especially due to byte
 361                  order problems.  */
 362               v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 363                                       unpack_field_as_long (type, valaddr, i));
 364
 365               chill_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 366                                stream, format, 0, recurse + 1, pretty);
 367             }
 368           else
 369             {
 370               chill_val_print (TYPE_FIELD_TYPE (type, i),
 371                                valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 372                                0, stream, format, 0, recurse + 1, pretty);
 373             }
 374         }
 375       if (pretty)
 376         {
 377           fprintf_filtered (stream, "\n");
 378           print_spaces_filtered (2 * recurse, stream);
 379         }
 380     }
 381   fprintf_filtered (stream, "]");
 382 }