gdb/f-valprint.c

   1 /* Support for printing Fortran values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1993-2017 Free Software Foundation, Inc.
   4
   5    Contributed by Motorola.  Adapted from the C definitions by Farooq Butt
   6    (fmbutt@engage.sps.mot.com), additionally worked over by Stan Shebs.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "symtab.h"
  25 #include "gdbtypes.h"
  26 #include "expression.h"
  27 #include "value.h"
  28 #include "valprint.h"
  29 #include "language.h"
  30 #include "f-lang.h"
  31 #include "frame.h"
  32 #include "gdbcore.h"
  33 #include "command.h"
  34 #include "block.h"
  35 #include "dictionary.h"
  36
  37 extern void _initialize_f_valprint (void);
  38 static void info_common_command (char *, int);
  39 static void f77_get_dynamic_length_of_aggregate (struct type *);
  40
  41 int f77_array_offset_tbl[MAX_FORTRAN_DIMS + 1][2];
  42
  43 /* Array which holds offsets to be applied to get a row's elements
  44    for a given array.  Array also holds the size of each subarray.  */
  45
  46 int
  47 f77_get_lowerbound (struct type *type)
  48 {
  49   if (TYPE_ARRAY_LOWER_BOUND_IS_UNDEFINED (type))
  50     error (_("Lower bound may not be '*' in F77"));
  51
  52   return TYPE_ARRAY_LOWER_BOUND_VALUE (type);
  53 }
  54
  55 int
  56 f77_get_upperbound (struct type *type)
  57 {
  58   if (TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
  59     {
  60       /* We have an assumed size array on our hands.  Assume that
  61          upper_bound == lower_bound so that we show at least 1 element.
  62          If the user wants to see more elements, let him manually ask for 'em
  63          and we'll subscript the array and show him.  */
  64
  65       return f77_get_lowerbound (type);
  66     }
  67
  68   return TYPE_ARRAY_UPPER_BOUND_VALUE (type);
  69 }
  70
  71 /* Obtain F77 adjustable array dimensions.  */
  72
  73 static void
  74 f77_get_dynamic_length_of_aggregate (struct type *type)
  75 {
  76   int upper_bound = -1;
  77   int lower_bound = 1;
  78
  79   /* Recursively go all the way down into a possibly multi-dimensional
  80      F77 array and get the bounds.  For simple arrays, this is pretty
  81      easy but when the bounds are dynamic, we must be very careful
  82      to add up all the lengths correctly.  Not doing this right
  83      will lead to horrendous-looking arrays in parameter lists.
  84
  85      This function also works for strings which behave very
  86      similarly to arrays.  */
  87
  88   if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_ARRAY
  89       || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRING)
  90     f77_get_dynamic_length_of_aggregate (TYPE_TARGET_TYPE (type));
  91
  92   /* Recursion ends here, start setting up lengths.  */
  93   lower_bound = f77_get_lowerbound (type);
  94   upper_bound = f77_get_upperbound (type);
  95
  96   /* Patch in a valid length value.  */
  97
  98   TYPE_LENGTH (type) =
  99     (upper_bound - lower_bound + 1)
 100     * TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type)));
 101 }
 102
 103 /* Actual function which prints out F77 arrays, Valaddr == address in
 104    the superior.  Address == the address in the inferior.  */
 105
 106 static void
 107 f77_print_array_1 (int nss, int ndimensions, struct type *type,
 108                    const gdb_byte *valaddr,
 109                    int embedded_offset, CORE_ADDR address,
 110                    struct ui_file *stream, int recurse,
 111                    const struct value *val,
 112                    const struct value_print_options *options,
 113                    int *elts)
 114 {
 115   struct type *range_type = TYPE_INDEX_TYPE (check_typedef (type));
 116   CORE_ADDR addr = address + embedded_offset;
 117   LONGEST lowerbound, upperbound;
 118   int i;
 119
 120   get_discrete_bounds (range_type, &lowerbound, &upperbound);
 121
 122   if (nss != ndimensions)
 123     {
 124       size_t dim_size = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
 125       size_t offs = 0;
 126
 127       for (i = lowerbound;
 128            (i < upperbound + 1 && (*elts) < options->print_max);
 129            i++)
 130         {
 131           struct value *subarray = value_from_contents_and_address
 132             (TYPE_TARGET_TYPE (type), value_contents_for_printing_const (val)
 133              + offs, addr + offs);
 134
 135           fprintf_filtered (stream, "( ");
 136           f77_print_array_1 (nss + 1, ndimensions, value_type (subarray),
 137                              value_contents_for_printing (subarray),
 138                              value_embedded_offset (subarray),
 139                              value_address (subarray),
 140                              stream, recurse, subarray, options, elts);
 141           offs += dim_size;
 142           fprintf_filtered (stream, ") ");
 143         }
 144       if (*elts >= options->print_max && i < upperbound)
 145         fprintf_filtered (stream, "...");
 146     }
 147   else
 148     {
 149       for (i = lowerbound; i < upperbound + 1 && (*elts) < options->print_max;
 150            i++, (*elts)++)
 151         {
 152           struct value *elt = value_subscript ((struct value *)val, i);
 153
 154           val_print (value_type (elt),
 155                      value_embedded_offset (elt),
 156                      value_address (elt), stream, recurse,
 157                      elt, options, current_language);
 158
 159           if (i != upperbound)
 160             fprintf_filtered (stream, ", ");
 161
 162           if ((*elts == options->print_max - 1)
 163               && (i != upperbound))
 164             fprintf_filtered (stream, "...");
 165         }
 166     }
 167 }
 168
 169 /* This function gets called to print an F77 array, we set up some
 170    stuff and then immediately call f77_print_array_1().  */
 171
 172 static void
 173 f77_print_array (struct type *type, const gdb_byte *valaddr,
 174                  int embedded_offset,
 175                  CORE_ADDR address, struct ui_file *stream,
 176                  int recurse,
 177                  const struct value *val,
 178                  const struct value_print_options *options)
 179 {
 180   int ndimensions;
 181   int elts = 0;
 182
 183   ndimensions = calc_f77_array_dims (type);
 184
 185   if (ndimensions > MAX_FORTRAN_DIMS || ndimensions < 0)
 186     error (_("\
 187 Type node corrupt! F77 arrays cannot have %d subscripts (%d Max)"),
 188            ndimensions, MAX_FORTRAN_DIMS);
 189
 190   f77_print_array_1 (1, ndimensions, type, valaddr, embedded_offset,
 191                      address, stream, recurse, val, options, &elts);
 192 }
 193 \f
 194
 195 /* Decorations for Fortran.  */
 196
 197 static const struct generic_val_print_decorations f_decorations =
 198 {
 199   "(",
 200   ",",
 201   ")",
 202   ".TRUE.",
 203   ".FALSE.",
 204   "VOID",
 205   "{",
 206   "}"
 207 };
 208
 209 /* See val_print for a description of the various parameters of this
 210    function; they are identical.  */
 211
 212 void
 213 f_val_print (struct type *type, int embedded_offset,
 214              CORE_ADDR address, struct ui_file *stream, int recurse,
 215              struct value *original_value,
 216              const struct value_print_options *options)
 217 {
 218   struct gdbarch *gdbarch = get_type_arch (type);
 219   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 220   int printed_field = 0; /* Number of fields printed.  */
 221   struct type *elttype;
 222   CORE_ADDR addr;
 223   int index;
 224   const gdb_byte *valaddr =value_contents_for_printing (original_value);
 225
 226   type = check_typedef (type);
 227   switch (TYPE_CODE (type))
 228     {
 229     case TYPE_CODE_STRING:
 230       f77_get_dynamic_length_of_aggregate (type);
 231       LA_PRINT_STRING (stream, builtin_type (gdbarch)->builtin_char,
 232                        valaddr + embedded_offset,
 233                        TYPE_LENGTH (type), NULL, 0, options);
 234       break;
 235
 236     case TYPE_CODE_ARRAY:
 237       if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_CHAR)
 238         {
 239           fprintf_filtered (stream, "(");
 240           f77_print_array (type, valaddr, embedded_offset,
 241                            address, stream, recurse, original_value, options);
 242           fprintf_filtered (stream, ")");
 243         }
 244       else
 245         {
 246           struct type *ch_type = TYPE_TARGET_TYPE (type);
 247
 248           f77_get_dynamic_length_of_aggregate (type);
 249           LA_PRINT_STRING (stream, ch_type,
 250                            valaddr + embedded_offset,
 251                            TYPE_LENGTH (type) / TYPE_LENGTH (ch_type),
 252                            NULL, 0, options);
 253         }
 254       break;
 255
 256     case TYPE_CODE_PTR:
 257       if (options->format && options->format != 's')
 258         {
 259           val_print_scalar_formatted (type, embedded_offset,
 260                                       original_value, options, 0, stream);
 261           break;
 262         }
 263       else
 264         {
 265           int want_space = 0;
 266
 267           addr = unpack_pointer (type, valaddr + embedded_offset);
 268           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 269
 270           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 271             {
 272               /* Try to print what function it points to.  */
 273               print_function_pointer_address (options, gdbarch, addr, stream);
 274               return;
 275             }
 276
 277           if (options->symbol_print)
 278             want_space = print_address_demangle (options, gdbarch, addr,
 279                                                  stream, demangle);
 280           else if (options->addressprint && options->format != 's')
 281             {
 282               fputs_filtered (paddress (gdbarch, addr), stream);
 283               want_space = 1;
 284             }
 285
 286           /* For a pointer to char or unsigned char, also print the string
 287              pointed to, unless pointer is null.  */
 288           if (TYPE_LENGTH (elttype) == 1
 289               && TYPE_CODE (elttype) == TYPE_CODE_INT
 290               && (options->format == 0 || options->format == 's')
 291               && addr != 0)
 292             {
 293               if (want_space)
 294                 fputs_filtered (" ", stream);
 295               val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 296                                 stream, options);
 297             }
 298           return;
 299         }
 300       break;
 301
 302     case TYPE_CODE_INT:
 303       if (options->format || options->output_format)
 304         {
 305           struct value_print_options opts = *options;
 306
 307           opts.format = (options->format ? options->format
 308                          : options->output_format);
 309           val_print_scalar_formatted (type, embedded_offset,
 310                                       original_value, &opts, 0, stream);
 311         }
 312       else
 313         val_print_scalar_formatted (type, embedded_offset,
 314                                     original_value, options, 0, stream);
 315       break;
 316
 317     case TYPE_CODE_STRUCT:
 318     case TYPE_CODE_UNION:
 319       /* Starting from the Fortran 90 standard, Fortran supports derived
 320          types.  */
 321       fprintf_filtered (stream, "( ");
 322       for (index = 0; index < TYPE_NFIELDS (type); index++)
 323         {
 324           struct value *field = value_field
 325             ((struct value *)original_value, index);
 326
 327           struct type *field_type = check_typedef (TYPE_FIELD_TYPE (type, index));
 328
 329
 330           if (TYPE_CODE (field_type) != TYPE_CODE_FUNC)
 331             {
 332               const char *field_name;
 333
 334               if (printed_field > 0)
 335                 fputs_filtered (", ", stream);
 336
 337               field_name = TYPE_FIELD_NAME (type, index);
 338               if (field_name != NULL)
 339                 {
 340                   fputs_filtered (field_name, stream);
 341                   fputs_filtered (" = ", stream);
 342                 }
 343
 344               val_print (value_type (field),
 345                          value_embedded_offset (field),
 346                          value_address (field), stream, recurse + 1,
 347                          field, options, current_language);
 348
 349               ++printed_field;
 350             }
 351          }
 352       fprintf_filtered (stream, " )");
 353       break;
 354
 355     case TYPE_CODE_REF:
 356     case TYPE_CODE_FUNC:
 357     case TYPE_CODE_FLAGS:
 358     case TYPE_CODE_FLT:
 359     case TYPE_CODE_VOID:
 360     case TYPE_CODE_ERROR:
 361     case TYPE_CODE_RANGE:
 362     case TYPE_CODE_UNDEF:
 363     case TYPE_CODE_COMPLEX:
 364     case TYPE_CODE_BOOL:
 365     case TYPE_CODE_CHAR:
 366     default:
 367       generic_val_print (type, embedded_offset, address,
 368                          stream, recurse, original_value, options,
 369                          &f_decorations);
 370       break;
 371     }
 372   gdb_flush (stream);
 373 }
 374
 375 static void
 376 info_common_command_for_block (const struct block *block, const char *comname,
 377                                int *any_printed)
 378 {
 379   struct block_iterator iter;
 380   struct symbol *sym;
 381   const char *name;
 382   struct value_print_options opts;
 383
 384   get_user_print_options (&opts);
 385
 386   ALL_BLOCK_SYMBOLS (block, iter, sym)
 387     if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
 388       {
 389         const struct common_block *common = SYMBOL_VALUE_COMMON_BLOCK (sym);
 390         size_t index;
 391
 392         gdb_assert (SYMBOL_CLASS (sym) == LOC_COMMON_BLOCK);
 393
 394         if (comname && (!SYMBOL_LINKAGE_NAME (sym)
 395                         || strcmp (comname, SYMBOL_LINKAGE_NAME (sym)) != 0))
 396           continue;
 397
 398         if (*any_printed)
 399           putchar_filtered ('\n');
 400         else
 401           *any_printed = 1;
 402         if (SYMBOL_PRINT_NAME (sym))
 403           printf_filtered (_("Contents of F77 COMMON block '%s':\n"),
 404                            SYMBOL_PRINT_NAME (sym));
 405         else
 406           printf_filtered (_("Contents of blank COMMON block:\n"));
 407
 408         for (index = 0; index < common->n_entries; index++)
 409           {
 410             struct value *val = NULL;
 411
 412             printf_filtered ("%s = ",
 413                              SYMBOL_PRINT_NAME (common->contents[index]));
 414
 415             TRY
 416               {
 417                 val = value_of_variable (common->contents[index], block);
 418                 value_print (val, gdb_stdout, &opts);
 419               }
 420
 421             CATCH (except, RETURN_MASK_ERROR)
 422               {
 423                 printf_filtered ("<error reading variable: %s>", except.message);
 424               }
 425             END_CATCH
 426
 427             putchar_filtered ('\n');
 428           }
 429       }
 430 }
 431
 432 /* This function is used to print out the values in a given COMMON
 433    block.  It will always use the most local common block of the
 434    given name.  */
 435
 436 static void
 437 info_common_command (char *comname, int from_tty)
 438 {
 439   struct frame_info *fi;
 440   const struct block *block;
 441   int values_printed = 0;
 442
 443   /* We have been told to display the contents of F77 COMMON
 444      block supposedly visible in this function.  Let us
 445      first make sure that it is visible and if so, let
 446      us display its contents.  */
 447
 448   fi = get_selected_frame (_("No frame selected"));
 449
 450   /* The following is generally ripped off from stack.c's routine
 451      print_frame_info().  */
 452
 453   block = get_frame_block (fi, 0);
 454   if (block == NULL)
 455     {
 456       printf_filtered (_("No symbol table info available.\n"));
 457       return;
 458     }
 459
 460   while (block)
 461     {
 462       info_common_command_for_block (block, comname, &values_printed);
 463       /* After handling the function's top-level block, stop.  Don't
 464          continue to its superblock, the block of per-file symbols.  */
 465       if (BLOCK_FUNCTION (block))
 466         break;
 467       block = BLOCK_SUPERBLOCK (block);
 468     }
 469
 470   if (!values_printed)
 471     {
 472       if (comname)
 473         printf_filtered (_("No common block '%s'.\n"), comname);
 474       else
 475         printf_filtered (_("No common blocks.\n"));
 476     }
 477 }
 478
 479 void
 480 _initialize_f_valprint (void)
 481 {
 482   add_info ("common", info_common_command,
 483             _("Print out the values contained in a Fortran COMMON block."));
 484 }