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
  30 static void
  31 chill_print_value_fields PARAMS ((struct type *, char *, FILE *, int, int,
  32                                   enum val_prettyprint, struct type **));
  33
  34 \f
  35 /* Print data of type TYPE located at VALADDR (within GDB), which came from
  36    the inferior at address ADDRESS, onto stdio stream STREAM according to
  37    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
  38    target byte order.
  39
  40    If the data are a string pointer, returns the number of string characters
  41    printed.
  42
  43    If DEREF_REF is nonzero, then dereference references, otherwise just print
  44    them like pointers.
  45
  46    The PRETTY parameter controls prettyprinting.  */
  47
  48 int
  49 chill_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
  50                  pretty)
  51      struct type *type;
  52      char *valaddr;
  53      CORE_ADDR address;
  54      FILE *stream;
  55      int format;
  56      int deref_ref;
  57      int recurse;
  58      enum val_prettyprint pretty;
  59 {
  60   LONGEST val;
  61   unsigned int i = 0;           /* Number of characters printed.  */
  62   struct type *elttype;
  63   unsigned eltlen;
  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'%x", 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           fprintf_filtered (stream, "H'%x ", addr);
 189         }
 190       i = TYPE_LENGTH (type);
 191       LA_PRINT_STRING (stream, valaddr, i, 0);
 192       /* Return number of characters printed, plus one for the terminating
 193          null if we have "reached the end".  */
 194       return (i + (print_max && i != print_max));
 195       break;
 196
 197     case TYPE_CODE_STRUCT:
 198       chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 199                                 0);
 200       break;
 201
 202     case TYPE_CODE_REF:
 203       if (addressprint)
 204         {
 205           fprintf_filtered (stream, "LOC(H'%lx)",
 206                             unpack_long (builtin_type_int, valaddr));
 207           if (deref_ref)
 208             fputs_filtered (": ", stream);
 209         }
 210       /* De-reference the reference.  */
 211       if (deref_ref)
 212         {
 213           if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
 214             {
 215               value deref_val =
 216                 value_at
 217                   (TYPE_TARGET_TYPE (type),
 218                    unpack_pointer (lookup_pointer_type (builtin_type_void),
 219                                    valaddr));
 220               val_print (VALUE_TYPE (deref_val),
 221                          VALUE_CONTENTS (deref_val),
 222                          VALUE_ADDRESS (deref_val), stream, format,
 223                          deref_ref, recurse + 1, pretty);
 224             }
 225           else
 226             fputs_filtered ("???", stream);
 227         }
 228       break;
 229
 230     case TYPE_CODE_ENUM:
 231       c_val_print (type, valaddr, address, stream, format,
 232                    deref_ref, recurse, pretty);
 233       break;
 234
 235     case TYPE_CODE_MEMBER:
 236     case TYPE_CODE_UNION:
 237     case TYPE_CODE_FUNC:
 238     case TYPE_CODE_VOID:
 239     case TYPE_CODE_ERROR:
 240     case TYPE_CODE_RANGE:
 241     default:
 242       /* Let's derfer printing to the C printer, rather than
 243          print an error message.  FIXME! */
 244       c_val_print (type, valaddr, address, stream, format,
 245                    deref_ref, recurse, pretty);
 246     }
 247   fflush (stream);
 248   return (0);
 249 }
 250
 251 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
 252    print out a structure's fields: cp_print_value_fields and cplus_print_value.
 253
 254    TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
 255    same meanings as in cplus_print_value and c_val_print.
 256
 257    DONT_PRINT is an array of baseclass types that we
 258    should not print, or zero if called from top level.  */
 259
 260 static void
 261 chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 262                           dont_print)
 263      struct type *type;
 264      char *valaddr;
 265      FILE *stream;
 266      int format;
 267      int recurse;
 268      enum val_prettyprint pretty;
 269      struct type **dont_print;
 270 {
 271   int i, len;
 272   int fields_seen = 0;
 273
 274   check_stub_type (type);
 275
 276   fprintf_filtered (stream, "[");
 277   len = TYPE_NFIELDS (type);
 278   if (len == 0)
 279     {
 280       fprintf_filtered (stream, "<No data fields>");
 281     }
 282   else
 283     {
 284       for (i = 0; i < len; i++)
 285         {
 286           if (fields_seen)
 287             {
 288               fprintf_filtered (stream, ", ");
 289             }
 290           fields_seen = 1;
 291           if (pretty)
 292             {
 293               fprintf_filtered (stream, "\n");
 294               print_spaces_filtered (2 + 2 * recurse, stream);
 295             }
 296           else
 297             {
 298               wrap_here (n_spaces (2 + 2 * recurse));
 299             }
 300           fputs_filtered (".", stream);
 301           fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 302                                    language_chill, DMGL_NO_OPTS);
 303           fputs_filtered (": ", stream);
 304           if (TYPE_FIELD_PACKED (type, i))
 305             {
 306               value v;
 307
 308               /* Bitfields require special handling, especially due to byte
 309                  order problems.  */
 310               v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 311                                       unpack_field_as_long (type, valaddr, i));
 312
 313               chill_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 314                                stream, format, 0, recurse + 1, pretty);
 315             }
 316           else
 317             {
 318               chill_val_print (TYPE_FIELD_TYPE (type, i),
 319                                valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 320                                0, stream, format, 0, recurse + 1, pretty);
 321             }
 322         }
 323       if (pretty)
 324         {
 325           fprintf_filtered (stream, "\n");
 326           print_spaces_filtered (2 * recurse, stream);
 327         }
 328     }
 329   fprintf_filtered (stream, "]");
 330 }
 331