gdb/f-valprint.c

   1 /* Support for printing Fortran values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1993-2019 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 static void f77_get_dynamic_length_of_aggregate (struct type *);
  38
  39 int f77_array_offset_tbl[MAX_FORTRAN_DIMS + 1][2];
  40
  41 /* Array which holds offsets to be applied to get a row's elements
  42    for a given array.  Array also holds the size of each subarray.  */
  43
  44 LONGEST
  45 f77_get_lowerbound (struct type *type)
  46 {
  47   if (TYPE_ARRAY_LOWER_BOUND_IS_UNDEFINED (type))
  48     error (_("Lower bound may not be '*' in F77"));
  49
  50   return TYPE_ARRAY_LOWER_BOUND_VALUE (type);
  51 }
  52
  53 LONGEST
  54 f77_get_upperbound (struct type *type)
  55 {
  56   if (TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
  57     {
  58       /* We have an assumed size array on our hands.  Assume that
  59          upper_bound == lower_bound so that we show at least 1 element.
  60          If the user wants to see more elements, let him manually ask for 'em
  61          and we'll subscript the array and show him.  */
  62
  63       return f77_get_lowerbound (type);
  64     }
  65
  66   return TYPE_ARRAY_UPPER_BOUND_VALUE (type);
  67 }
  68
  69 /* Obtain F77 adjustable array dimensions.  */
  70
  71 static void
  72 f77_get_dynamic_length_of_aggregate (struct type *type)
  73 {
  74   int upper_bound = -1;
  75   int lower_bound = 1;
  76
  77   /* Recursively go all the way down into a possibly multi-dimensional
  78      F77 array and get the bounds.  For simple arrays, this is pretty
  79      easy but when the bounds are dynamic, we must be very careful
  80      to add up all the lengths correctly.  Not doing this right
  81      will lead to horrendous-looking arrays in parameter lists.
  82
  83      This function also works for strings which behave very
  84      similarly to arrays.  */
  85
  86   if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_ARRAY
  87       || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRING)
  88     f77_get_dynamic_length_of_aggregate (TYPE_TARGET_TYPE (type));
  89
  90   /* Recursion ends here, start setting up lengths.  */
  91   lower_bound = f77_get_lowerbound (type);
  92   upper_bound = f77_get_upperbound (type);
  93
  94   /* Patch in a valid length value.  */
  95
  96   TYPE_LENGTH (type) =
  97     (upper_bound - lower_bound + 1)
  98     * TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type)));
  99 }
 100
 101 /* Actual function which prints out F77 arrays, Valaddr == address in
 102    the superior.  Address == the address in the inferior.  */
 103
 104 static void
 105 f77_print_array_1 (int nss, int ndimensions, struct type *type,
 106                    const gdb_byte *valaddr,
 107                    int embedded_offset, CORE_ADDR address,
 108                    struct ui_file *stream, int recurse,
 109                    const struct value *val,
 110                    const struct value_print_options *options,
 111                    int *elts)
 112 {
 113   struct type *range_type = TYPE_INDEX_TYPE (check_typedef (type));
 114   CORE_ADDR addr = address + embedded_offset;
 115   LONGEST lowerbound, upperbound;
 116   int i;
 117
 118   get_discrete_bounds (range_type, &lowerbound, &upperbound);
 119
 120   if (nss != ndimensions)
 121     {
 122       size_t dim_size = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
 123       size_t offs = 0;
 124
 125       for (i = lowerbound;
 126            (i < upperbound + 1 && (*elts) < options->print_max);
 127            i++)
 128         {
 129           struct value *subarray = value_from_contents_and_address
 130             (TYPE_TARGET_TYPE (type), value_contents_for_printing_const (val)
 131              + offs, addr + offs);
 132
 133           fprintf_filtered (stream, "( ");
 134           f77_print_array_1 (nss + 1, ndimensions, value_type (subarray),
 135                              value_contents_for_printing (subarray),
 136                              value_embedded_offset (subarray),
 137                              value_address (subarray),
 138                              stream, recurse, subarray, options, elts);
 139           offs += dim_size;
 140           fprintf_filtered (stream, ") ");
 141         }
 142       if (*elts >= options->print_max && i < upperbound)
 143         fprintf_filtered (stream, "...");
 144     }
 145   else
 146     {
 147       for (i = lowerbound; i < upperbound + 1 && (*elts) < options->print_max;
 148            i++, (*elts)++)
 149         {
 150           struct value *elt = value_subscript ((struct value *)val, i);
 151
 152           val_print (value_type (elt),
 153                      value_embedded_offset (elt),
 154                      value_address (elt), stream, recurse,
 155                      elt, options, current_language);
 156
 157           if (i != upperbound)
 158             fprintf_filtered (stream, ", ");
 159
 160           if ((*elts == options->print_max - 1)
 161               && (i != upperbound))
 162             fprintf_filtered (stream, "...");
 163         }
 164     }
 165 }
 166
 167 /* This function gets called to print an F77 array, we set up some
 168    stuff and then immediately call f77_print_array_1().  */
 169
 170 static void
 171 f77_print_array (struct type *type, const gdb_byte *valaddr,
 172                  int embedded_offset,
 173                  CORE_ADDR address, struct ui_file *stream,
 174                  int recurse,
 175                  const struct value *val,
 176                  const struct value_print_options *options)
 177 {
 178   int ndimensions;
 179   int elts = 0;
 180
 181   ndimensions = calc_f77_array_dims (type);
 182
 183   if (ndimensions > MAX_FORTRAN_DIMS || ndimensions < 0)
 184     error (_("\
 185 Type node corrupt! F77 arrays cannot have %d subscripts (%d Max)"),
 186            ndimensions, MAX_FORTRAN_DIMS);
 187
 188   f77_print_array_1 (1, ndimensions, type, valaddr, embedded_offset,
 189                      address, stream, recurse, val, options, &elts);
 190 }
 191 \f
 192
 193 /* Decorations for Fortran.  */
 194
 195 static const struct generic_val_print_decorations f_decorations =
 196 {
 197   "(",
 198   ",",
 199   ")",
 200   ".TRUE.",
 201   ".FALSE.",
 202   "void",
 203   "{",
 204   "}"
 205 };
 206
 207 /* See val_print for a description of the various parameters of this
 208    function; they are identical.  */
 209
 210 void
 211 f_val_print (struct type *type, int embedded_offset,
 212              CORE_ADDR address, struct ui_file *stream, int recurse,
 213              struct value *original_value,
 214              const struct value_print_options *options)
 215 {
 216   struct gdbarch *gdbarch = get_type_arch (type);
 217   int printed_field = 0; /* Number of fields printed.  */
 218   struct type *elttype;
 219   CORE_ADDR addr;
 220   int index;
 221   const gdb_byte *valaddr =value_contents_for_printing (original_value);
 222
 223   type = check_typedef (type);
 224   switch (TYPE_CODE (type))
 225     {
 226     case TYPE_CODE_STRING:
 227       f77_get_dynamic_length_of_aggregate (type);
 228       LA_PRINT_STRING (stream, builtin_type (gdbarch)->builtin_char,
 229                        valaddr + embedded_offset,
 230                        TYPE_LENGTH (type), NULL, 0, options);
 231       break;
 232
 233     case TYPE_CODE_ARRAY:
 234       if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_CHAR)
 235         {
 236           fprintf_filtered (stream, "(");
 237           f77_print_array (type, valaddr, embedded_offset,
 238                            address, stream, recurse, original_value, options);
 239           fprintf_filtered (stream, ")");
 240         }
 241       else
 242         {
 243           struct type *ch_type = TYPE_TARGET_TYPE (type);
 244
 245           f77_get_dynamic_length_of_aggregate (type);
 246           LA_PRINT_STRING (stream, ch_type,
 247                            valaddr + embedded_offset,
 248                            TYPE_LENGTH (type) / TYPE_LENGTH (ch_type),
 249                            NULL, 0, options);
 250         }
 251       break;
 252
 253     case TYPE_CODE_PTR:
 254       if (options->format && options->format != 's')
 255         {
 256           val_print_scalar_formatted (type, embedded_offset,
 257                                       original_value, options, 0, stream);
 258           break;
 259         }
 260       else
 261         {
 262           int want_space = 0;
 263
 264           addr = unpack_pointer (type, valaddr + embedded_offset);
 265           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 266
 267           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 268             {
 269               /* Try to print what function it points to.  */
 270               print_function_pointer_address (options, gdbarch, addr, stream);
 271               return;
 272             }
 273
 274           if (options->symbol_print)
 275             want_space = print_address_demangle (options, gdbarch, addr,
 276                                                  stream, demangle);
 277           else if (options->addressprint && options->format != 's')
 278             {
 279               fputs_filtered (paddress (gdbarch, addr), stream);
 280               want_space = 1;
 281             }
 282
 283           /* For a pointer to char or unsigned char, also print the string
 284              pointed to, unless pointer is null.  */
 285           if (TYPE_LENGTH (elttype) == 1
 286               && TYPE_CODE (elttype) == TYPE_CODE_INT
 287               && (options->format == 0 || options->format == 's')
 288               && addr != 0)
 289             {
 290               if (want_space)
 291                 fputs_filtered (" ", stream);
 292               val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 293                                 stream, options);
 294             }
 295           return;
 296         }
 297       break;
 298
 299     case TYPE_CODE_INT:
 300       if (options->format || options->output_format)
 301         {
 302           struct value_print_options opts = *options;
 303
 304           opts.format = (options->format ? options->format
 305                          : options->output_format);
 306           val_print_scalar_formatted (type, embedded_offset,
 307                                       original_value, &opts, 0, stream);
 308         }
 309       else
 310         val_print_scalar_formatted (type, embedded_offset,
 311                                     original_value, options, 0, stream);
 312       break;
 313
 314     case TYPE_CODE_STRUCT:
 315     case TYPE_CODE_UNION:
 316       /* Starting from the Fortran 90 standard, Fortran supports derived
 317          types.  */
 318       fprintf_filtered (stream, "( ");
 319       for (index = 0; index < TYPE_NFIELDS (type); index++)
 320         {
 321           struct value *field = value_field
 322             ((struct value *)original_value, index);
 323
 324           struct type *field_type = check_typedef (TYPE_FIELD_TYPE (type, index));
 325
 326
 327           if (TYPE_CODE (field_type) != TYPE_CODE_FUNC)
 328             {
 329               const char *field_name;
 330
 331               if (printed_field > 0)
 332                 fputs_filtered (", ", stream);
 333
 334               field_name = TYPE_FIELD_NAME (type, index);
 335               if (field_name != NULL)
 336                 {
 337                   fputs_filtered (field_name, stream);
 338                   fputs_filtered (" = ", stream);
 339                 }
 340
 341               val_print (value_type (field),
 342                          value_embedded_offset (field),
 343                          value_address (field), stream, recurse + 1,
 344                          field, options, current_language);
 345
 346               ++printed_field;
 347             }
 348          }
 349       fprintf_filtered (stream, " )");
 350       break;
 351
 352     case TYPE_CODE_REF:
 353     case TYPE_CODE_FUNC:
 354     case TYPE_CODE_FLAGS:
 355     case TYPE_CODE_FLT:
 356     case TYPE_CODE_VOID:
 357     case TYPE_CODE_ERROR:
 358     case TYPE_CODE_RANGE:
 359     case TYPE_CODE_UNDEF:
 360     case TYPE_CODE_COMPLEX:
 361     case TYPE_CODE_BOOL:
 362     case TYPE_CODE_CHAR:
 363     default:
 364       generic_val_print (type, embedded_offset, address,
 365                          stream, recurse, original_value, options,
 366                          &f_decorations);
 367       break;
 368     }
 369 }
 370
 371 static void
 372 info_common_command_for_block (const struct block *block, const char *comname,
 373                                int *any_printed)
 374 {
 375   struct block_iterator iter;
 376   struct symbol *sym;
 377   struct value_print_options opts;
 378
 379   get_user_print_options (&opts);
 380
 381   ALL_BLOCK_SYMBOLS (block, iter, sym)
 382     if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
 383       {
 384         const struct common_block *common = SYMBOL_VALUE_COMMON_BLOCK (sym);
 385         size_t index;
 386
 387         gdb_assert (SYMBOL_CLASS (sym) == LOC_COMMON_BLOCK);
 388
 389         if (comname && (!SYMBOL_LINKAGE_NAME (sym)
 390                         || strcmp (comname, SYMBOL_LINKAGE_NAME (sym)) != 0))
 391           continue;
 392
 393         if (*any_printed)
 394           putchar_filtered ('\n');
 395         else
 396           *any_printed = 1;
 397         if (SYMBOL_PRINT_NAME (sym))
 398           printf_filtered (_("Contents of F77 COMMON block '%s':\n"),
 399                            SYMBOL_PRINT_NAME (sym));
 400         else
 401           printf_filtered (_("Contents of blank COMMON block:\n"));
 402
 403         for (index = 0; index < common->n_entries; index++)
 404           {
 405             struct value *val = NULL;
 406
 407             printf_filtered ("%s = ",
 408                              SYMBOL_PRINT_NAME (common->contents[index]));
 409
 410             try
 411               {
 412                 val = value_of_variable (common->contents[index], block);
 413                 value_print (val, gdb_stdout, &opts);
 414               }
 415
 416             catch (const gdb_exception_error &except)
 417               {
 418                 printf_filtered ("<error reading variable: %s>",
 419                                  except.what ());
 420               }
 421
 422             putchar_filtered ('\n');
 423           }
 424       }
 425 }
 426
 427 /* This function is used to print out the values in a given COMMON
 428    block.  It will always use the most local common block of the
 429    given name.  */
 430
 431 static void
 432 info_common_command (const char *comname, int from_tty)
 433 {
 434   struct frame_info *fi;
 435   const struct block *block;
 436   int values_printed = 0;
 437
 438   /* We have been told to display the contents of F77 COMMON
 439      block supposedly visible in this function.  Let us
 440      first make sure that it is visible and if so, let
 441      us display its contents.  */
 442
 443   fi = get_selected_frame (_("No frame selected"));
 444
 445   /* The following is generally ripped off from stack.c's routine
 446      print_frame_info().  */
 447
 448   block = get_frame_block (fi, 0);
 449   if (block == NULL)
 450     {
 451       printf_filtered (_("No symbol table info available.\n"));
 452       return;
 453     }
 454
 455   while (block)
 456     {
 457       info_common_command_for_block (block, comname, &values_printed);
 458       /* After handling the function's top-level block, stop.  Don't
 459          continue to its superblock, the block of per-file symbols.  */
 460       if (BLOCK_FUNCTION (block))
 461         break;
 462       block = BLOCK_SUPERBLOCK (block);
 463     }
 464
 465   if (!values_printed)
 466     {
 467       if (comname)
 468         printf_filtered (_("No common block '%s'.\n"), comname);
 469       else
 470         printf_filtered (_("No common blocks.\n"));
 471     }
 472 }
 473
 474 void
 475 _initialize_f_valprint (void)
 476 {
 477   add_info ("common", info_common_command,
 478             _("Print out the values contained in a Fortran COMMON block."));
 479 }