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_STRUCT:
 200       chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 201                                 0);
 202       break;
 203
 204     case TYPE_CODE_REF:
 205       if (addressprint)
 206         {
 207           fprintf_filtered (stream, "LOC(H'%lx)",
 208                             unpack_long (builtin_type_int, valaddr));
 209           if (deref_ref)
 210             fputs_filtered (": ", stream);
 211         }
 212       /* De-reference the reference.  */
 213       if (deref_ref)
 214         {
 215           if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
 216             {
 217               value deref_val =
 218                 value_at
 219                   (TYPE_TARGET_TYPE (type),
 220                    unpack_pointer (lookup_pointer_type (builtin_type_void),
 221                                    valaddr));
 222               val_print (VALUE_TYPE (deref_val),
 223                          VALUE_CONTENTS (deref_val),
 224                          VALUE_ADDRESS (deref_val), stream, format,
 225                          deref_ref, recurse + 1, pretty);
 226             }
 227           else
 228             fputs_filtered ("???", stream);
 229         }
 230       break;
 231
 232     case TYPE_CODE_ENUM:
 233       c_val_print (type, valaddr, address, stream, format,
 234                    deref_ref, recurse, pretty);
 235       break;
 236
 237     case TYPE_CODE_MEMBER:
 238     case TYPE_CODE_UNION:
 239     case TYPE_CODE_FUNC:
 240     case TYPE_CODE_VOID:
 241     case TYPE_CODE_ERROR:
 242     case TYPE_CODE_RANGE:
 243     default:
 244       /* Let's derfer printing to the C printer, rather than
 245          print an error message.  FIXME! */
 246       c_val_print (type, valaddr, address, stream, format,
 247                    deref_ref, recurse, pretty);
 248     }
 249   gdb_flush (stream);
 250   return (0);
 251 }
 252
 253 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
 254    print out a structure's fields: cp_print_value_fields and cplus_print_value.
 255
 256    TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
 257    same meanings as in cplus_print_value and c_val_print.
 258
 259    DONT_PRINT is an array of baseclass types that we
 260    should not print, or zero if called from top level.  */
 261
 262 static void
 263 chill_print_value_fields (type, valaddr, stream, format, recurse, pretty,
 264                           dont_print)
 265      struct type *type;
 266      char *valaddr;
 267      GDB_FILE *stream;
 268      int format;
 269      int recurse;
 270      enum val_prettyprint pretty;
 271      struct type **dont_print;
 272 {
 273   int i, len;
 274   int fields_seen = 0;
 275
 276   check_stub_type (type);
 277
 278   fprintf_filtered (stream, "[");
 279   len = TYPE_NFIELDS (type);
 280   if (len == 0)
 281     {
 282       fprintf_filtered (stream, "<No data fields>");
 283     }
 284   else
 285     {
 286       for (i = 0; i < len; i++)
 287         {
 288           if (fields_seen)
 289             {
 290               fprintf_filtered (stream, ", ");
 291             }
 292           fields_seen = 1;
 293           if (pretty)
 294             {
 295               fprintf_filtered (stream, "\n");
 296               print_spaces_filtered (2 + 2 * recurse, stream);
 297             }
 298           else
 299             {
 300               wrap_here (n_spaces (2 + 2 * recurse));
 301             }
 302           fputs_filtered (".", stream);
 303           fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 304                                    language_chill, DMGL_NO_OPTS);
 305           fputs_filtered (": ", stream);
 306           if (TYPE_FIELD_PACKED (type, i))
 307             {
 308               value v;
 309
 310               /* Bitfields require special handling, especially due to byte
 311                  order problems.  */
 312               v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 313                                       unpack_field_as_long (type, valaddr, i));
 314
 315               chill_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
 316                                stream, format, 0, recurse + 1, pretty);
 317             }
 318           else
 319             {
 320               chill_val_print (TYPE_FIELD_TYPE (type, i),
 321                                valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 322                                0, stream, format, 0, recurse + 1, pretty);
 323             }
 324         }
 325       if (pretty)
 326         {
 327           fprintf_filtered (stream, "\n");
 328           print_spaces_filtered (2 * recurse, stream);
 329         }
 330     }
 331   fprintf_filtered (stream, "]");
 332 }
 333