gdb/f-valprint.c

   1 /* Support for printing Fortran values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1993-1996, 1998-2000, 2003, 2005-2012 Free Software
   4    Foundation, Inc.
   5
   6    Contributed by Motorola.  Adapted from the C definitions by Farooq Butt
   7    (fmbutt@engage.sps.mot.com), additionally worked over by Stan Shebs.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  23
  24 #include "defs.h"
  25 #include "gdb_string.h"
  26 #include "symtab.h"
  27 #include "gdbtypes.h"
  28 #include "expression.h"
  29 #include "value.h"
  30 #include "valprint.h"
  31 #include "language.h"
  32 #include "f-lang.h"
  33 #include "frame.h"
  34 #include "gdbcore.h"
  35 #include "command.h"
  36 #include "block.h"
  37
  38 #if 0
  39 static int there_is_a_visible_common_named (char *);
  40 #endif
  41
  42 extern void _initialize_f_valprint (void);
  43 static void info_common_command (char *, int);
  44 static void list_all_visible_commons (const char *);
  45 static void f77_create_arrayprint_offset_tbl (struct type *,
  46                                               struct ui_file *);
  47 static void f77_get_dynamic_length_of_aggregate (struct type *);
  48
  49 int f77_array_offset_tbl[MAX_FORTRAN_DIMS + 1][2];
  50
  51 /* Array which holds offsets to be applied to get a row's elements
  52    for a given array.  Array also holds the size of each subarray.  */
  53
  54 /* The following macro gives us the size of the nth dimension, Where
  55    n is 1 based.  */
  56
  57 #define F77_DIM_SIZE(n) (f77_array_offset_tbl[n][1])
  58
  59 /* The following gives us the offset for row n where n is 1-based.  */
  60
  61 #define F77_DIM_OFFSET(n) (f77_array_offset_tbl[n][0])
  62
  63 int
  64 f77_get_lowerbound (struct type *type)
  65 {
  66   if (TYPE_ARRAY_LOWER_BOUND_IS_UNDEFINED (type))
  67     error (_("Lower bound may not be '*' in F77"));
  68
  69   return TYPE_ARRAY_LOWER_BOUND_VALUE (type);
  70 }
  71
  72 int
  73 f77_get_upperbound (struct type *type)
  74 {
  75   if (TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
  76     {
  77       /* We have an assumed size array on our hands.  Assume that
  78          upper_bound == lower_bound so that we show at least 1 element.
  79          If the user wants to see more elements, let him manually ask for 'em
  80          and we'll subscript the array and show him.  */
  81
  82       return f77_get_lowerbound (type);
  83     }
  84
  85   return TYPE_ARRAY_UPPER_BOUND_VALUE (type);
  86 }
  87
  88 /* Obtain F77 adjustable array dimensions.  */
  89
  90 static void
  91 f77_get_dynamic_length_of_aggregate (struct type *type)
  92 {
  93   int upper_bound = -1;
  94   int lower_bound = 1;
  95
  96   /* Recursively go all the way down into a possibly multi-dimensional
  97      F77 array and get the bounds.  For simple arrays, this is pretty
  98      easy but when the bounds are dynamic, we must be very careful
  99      to add up all the lengths correctly.  Not doing this right
 100      will lead to horrendous-looking arrays in parameter lists.
 101
 102      This function also works for strings which behave very
 103      similarly to arrays.  */
 104
 105   if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_ARRAY
 106       || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRING)
 107     f77_get_dynamic_length_of_aggregate (TYPE_TARGET_TYPE (type));
 108
 109   /* Recursion ends here, start setting up lengths.  */
 110   lower_bound = f77_get_lowerbound (type);
 111   upper_bound = f77_get_upperbound (type);
 112
 113   /* Patch in a valid length value.  */
 114
 115   TYPE_LENGTH (type) =
 116     (upper_bound - lower_bound + 1)
 117     * TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type)));
 118 }
 119
 120 /* Function that sets up the array offset,size table for the array
 121    type "type".  */
 122
 123 static void
 124 f77_create_arrayprint_offset_tbl (struct type *type, struct ui_file *stream)
 125 {
 126   struct type *tmp_type;
 127   int eltlen;
 128   int ndimen = 1;
 129   int upper, lower;
 130
 131   tmp_type = type;
 132
 133   while ((TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY))
 134     {
 135       upper = f77_get_upperbound (tmp_type);
 136       lower = f77_get_lowerbound (tmp_type);
 137
 138       F77_DIM_SIZE (ndimen) = upper - lower + 1;
 139
 140       tmp_type = TYPE_TARGET_TYPE (tmp_type);
 141       ndimen++;
 142     }
 143
 144   /* Now we multiply eltlen by all the offsets, so that later we
 145      can print out array elements correctly.  Up till now we
 146      know an offset to apply to get the item but we also
 147      have to know how much to add to get to the next item.  */
 148
 149   ndimen--;
 150   eltlen = TYPE_LENGTH (tmp_type);
 151   F77_DIM_OFFSET (ndimen) = eltlen;
 152   while (--ndimen > 0)
 153     {
 154       eltlen *= F77_DIM_SIZE (ndimen + 1);
 155       F77_DIM_OFFSET (ndimen) = eltlen;
 156     }
 157 }
 158
 159
 160
 161 /* Actual function which prints out F77 arrays, Valaddr == address in
 162    the superior.  Address == the address in the inferior.  */
 163
 164 static void
 165 f77_print_array_1 (int nss, int ndimensions, struct type *type,
 166                    const gdb_byte *valaddr,
 167                    int embedded_offset, CORE_ADDR address,
 168                    struct ui_file *stream, int recurse,
 169                    const struct value *val,
 170                    const struct value_print_options *options,
 171                    int *elts)
 172 {
 173   int i;
 174
 175   if (nss != ndimensions)
 176     {
 177       for (i = 0;
 178            (i < F77_DIM_SIZE (nss) && (*elts) < options->print_max);
 179            i++)
 180         {
 181           fprintf_filtered (stream, "( ");
 182           f77_print_array_1 (nss + 1, ndimensions, TYPE_TARGET_TYPE (type),
 183                              valaddr,
 184                              embedded_offset + i * F77_DIM_OFFSET (nss),
 185                              address,
 186                              stream, recurse, val, options, elts);
 187           fprintf_filtered (stream, ") ");
 188         }
 189       if (*elts >= options->print_max && i < F77_DIM_SIZE (nss))
 190         fprintf_filtered (stream, "...");
 191     }
 192   else
 193     {
 194       for (i = 0; i < F77_DIM_SIZE (nss) && (*elts) < options->print_max;
 195            i++, (*elts)++)
 196         {
 197           val_print (TYPE_TARGET_TYPE (type),
 198                      valaddr,
 199                      embedded_offset + i * F77_DIM_OFFSET (ndimensions),
 200                      address, stream, recurse,
 201                      val, options, current_language);
 202
 203           if (i != (F77_DIM_SIZE (nss) - 1))
 204             fprintf_filtered (stream, ", ");
 205
 206           if ((*elts == options->print_max - 1)
 207               && (i != (F77_DIM_SIZE (nss) - 1)))
 208             fprintf_filtered (stream, "...");
 209         }
 210     }
 211 }
 212
 213 /* This function gets called to print an F77 array, we set up some
 214    stuff and then immediately call f77_print_array_1().  */
 215
 216 static void
 217 f77_print_array (struct type *type, const gdb_byte *valaddr,
 218                  int embedded_offset,
 219                  CORE_ADDR address, struct ui_file *stream,
 220                  int recurse,
 221                  const struct value *val,
 222                  const struct value_print_options *options)
 223 {
 224   int ndimensions;
 225   int elts = 0;
 226
 227   ndimensions = calc_f77_array_dims (type);
 228
 229   if (ndimensions > MAX_FORTRAN_DIMS || ndimensions < 0)
 230     error (_("\
 231 Type node corrupt! F77 arrays cannot have %d subscripts (%d Max)"),
 232            ndimensions, MAX_FORTRAN_DIMS);
 233
 234   /* Since F77 arrays are stored column-major, we set up an
 235      offset table to get at the various row's elements.  The
 236      offset table contains entries for both offset and subarray size.  */
 237
 238   f77_create_arrayprint_offset_tbl (type, stream);
 239
 240   f77_print_array_1 (1, ndimensions, type, valaddr, embedded_offset,
 241                      address, stream, recurse, val, options, &elts);
 242 }
 243 \f
 244
 245 /* Decorations for Fortran.  */
 246
 247 static const struct generic_val_print_decorations f_decorations =
 248 {
 249   "(",
 250   ",",
 251   ")",
 252   ".TRUE.",
 253   ".FALSE.",
 254   "VOID",
 255 };
 256
 257 /* See val_print for a description of the various parameters of this
 258    function; they are identical.  */
 259
 260 void
 261 f_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 262              CORE_ADDR address, struct ui_file *stream, int recurse,
 263              const struct value *original_value,
 264              const struct value_print_options *options)
 265 {
 266   struct gdbarch *gdbarch = get_type_arch (type);
 267   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 268   unsigned int i = 0;   /* Number of characters printed.  */
 269   struct type *elttype;
 270   LONGEST val;
 271   CORE_ADDR addr;
 272   int index;
 273
 274   CHECK_TYPEDEF (type);
 275   switch (TYPE_CODE (type))
 276     {
 277     case TYPE_CODE_STRING:
 278       f77_get_dynamic_length_of_aggregate (type);
 279       LA_PRINT_STRING (stream, builtin_type (gdbarch)->builtin_char,
 280                        valaddr + embedded_offset,
 281                        TYPE_LENGTH (type), NULL, 0, options);
 282       break;
 283
 284     case TYPE_CODE_ARRAY:
 285       if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_CHAR)
 286         {
 287           fprintf_filtered (stream, "(");
 288           f77_print_array (type, valaddr, embedded_offset,
 289                            address, stream, recurse, original_value, options);
 290           fprintf_filtered (stream, ")");
 291         }
 292       else
 293         {
 294           struct type *ch_type = TYPE_TARGET_TYPE (type);
 295
 296           f77_get_dynamic_length_of_aggregate (type);
 297           LA_PRINT_STRING (stream, ch_type,
 298                            valaddr + embedded_offset,
 299                            TYPE_LENGTH (type) / TYPE_LENGTH (ch_type),
 300                            NULL, 0, options);
 301         }
 302       break;
 303
 304     case TYPE_CODE_PTR:
 305       if (options->format && options->format != 's')
 306         {
 307           val_print_scalar_formatted (type, valaddr, embedded_offset,
 308                                       original_value, options, 0, stream);
 309           break;
 310         }
 311       else
 312         {
 313           addr = unpack_pointer (type, valaddr + embedded_offset);
 314           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 315
 316           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 317             {
 318               /* Try to print what function it points to.  */
 319               print_function_pointer_address (options, gdbarch, addr, stream);
 320               return;
 321             }
 322
 323           if (options->addressprint && options->format != 's')
 324             fputs_filtered (paddress (gdbarch, addr), stream);
 325
 326           /* For a pointer to char or unsigned char, also print the string
 327              pointed to, unless pointer is null.  */
 328           if (TYPE_LENGTH (elttype) == 1
 329               && TYPE_CODE (elttype) == TYPE_CODE_INT
 330               && (options->format == 0 || options->format == 's')
 331               && addr != 0)
 332             i = val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 333                                   stream, options);
 334           return;
 335         }
 336       break;
 337
 338     case TYPE_CODE_INT:
 339       if (options->format || options->output_format)
 340         {
 341           struct value_print_options opts = *options;
 342
 343           opts.format = (options->format ? options->format
 344                          : options->output_format);
 345           val_print_scalar_formatted (type, valaddr, embedded_offset,
 346                                       original_value, options, 0, stream);
 347         }
 348       else
 349         {
 350           val_print_type_code_int (type, valaddr + embedded_offset, stream);
 351           /* C and C++ has no single byte int type, char is used instead.
 352              Since we don't know whether the value is really intended to
 353              be used as an integer or a character, print the character
 354              equivalent as well.  */
 355           if (TYPE_LENGTH (type) == 1)
 356             {
 357               LONGEST c;
 358
 359               fputs_filtered (" ", stream);
 360               c = unpack_long (type, valaddr + embedded_offset);
 361               LA_PRINT_CHAR ((unsigned char) c, type, stream);
 362             }
 363         }
 364       break;
 365
 366     case TYPE_CODE_STRUCT:
 367     case TYPE_CODE_UNION:
 368       /* Starting from the Fortran 90 standard, Fortran supports derived
 369          types.  */
 370       fprintf_filtered (stream, "( ");
 371       for (index = 0; index < TYPE_NFIELDS (type); index++)
 372         {
 373           int offset = TYPE_FIELD_BITPOS (type, index) / 8;
 374
 375           val_print (TYPE_FIELD_TYPE (type, index), valaddr,
 376                      embedded_offset + offset,
 377                      address, stream, recurse + 1,
 378                      original_value, options, current_language);
 379           if (index != TYPE_NFIELDS (type) - 1)
 380             fputs_filtered (", ", stream);
 381         }
 382       fprintf_filtered (stream, " )");
 383       break;
 384
 385     case TYPE_CODE_REF:
 386     case TYPE_CODE_FUNC:
 387     case TYPE_CODE_FLAGS:
 388     case TYPE_CODE_FLT:
 389     case TYPE_CODE_VOID:
 390     case TYPE_CODE_ERROR:
 391     case TYPE_CODE_RANGE:
 392     case TYPE_CODE_UNDEF:
 393     case TYPE_CODE_COMPLEX:
 394     case TYPE_CODE_BOOL:
 395     case TYPE_CODE_CHAR:
 396     default:
 397       generic_val_print (type, valaddr, embedded_offset, address,
 398                          stream, recurse, original_value, options,
 399                          &f_decorations);
 400       break;
 401     }
 402   gdb_flush (stream);
 403 }
 404
 405 static void
 406 list_all_visible_commons (const char *funname)
 407 {
 408   SAVED_F77_COMMON_PTR tmp;
 409
 410   tmp = head_common_list;
 411
 412   printf_filtered (_("All COMMON blocks visible at this level:\n\n"));
 413
 414   while (tmp != NULL)
 415     {
 416       if (strcmp (tmp->owning_function, funname) == 0)
 417         printf_filtered ("%s\n", tmp->name);
 418
 419       tmp = tmp->next;
 420     }
 421 }
 422
 423 /* This function is used to print out the values in a given COMMON
 424    block.  It will always use the most local common block of the
 425    given name.  */
 426
 427 static void
 428 info_common_command (char *comname, int from_tty)
 429 {
 430   SAVED_F77_COMMON_PTR the_common;
 431   COMMON_ENTRY_PTR entry;
 432   struct frame_info *fi;
 433   const char *funname = 0;
 434   struct symbol *func;
 435
 436   /* We have been told to display the contents of F77 COMMON
 437      block supposedly visible in this function.  Let us
 438      first make sure that it is visible and if so, let
 439      us display its contents.  */
 440
 441   fi = get_selected_frame (_("No frame selected"));
 442
 443   /* The following is generally ripped off from stack.c's routine
 444      print_frame_info().  */
 445
 446   func = find_pc_function (get_frame_pc (fi));
 447   if (func)
 448     {
 449       /* In certain pathological cases, the symtabs give the wrong
 450          function (when we are in the first function in a file which
 451          is compiled without debugging symbols, the previous function
 452          is compiled with debugging symbols, and the "foo.o" symbol
 453          that is supposed to tell us where the file with debugging symbols
 454          ends has been truncated by ar because it is longer than 15
 455          characters).
 456
 457          So look in the minimal symbol tables as well, and if it comes
 458          up with a larger address for the function use that instead.
 459          I don't think this can ever cause any problems; there shouldn't
 460          be any minimal symbols in the middle of a function.
 461          FIXME:  (Not necessarily true.  What about text labels?)  */
 462
 463       struct minimal_symbol *msymbol =
 464         lookup_minimal_symbol_by_pc (get_frame_pc (fi));
 465
 466       if (msymbol != NULL
 467           && (SYMBOL_VALUE_ADDRESS (msymbol)
 468               > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
 469         funname = SYMBOL_LINKAGE_NAME (msymbol);
 470       else
 471         funname = SYMBOL_LINKAGE_NAME (func);
 472     }
 473   else
 474     {
 475       struct minimal_symbol *msymbol =
 476         lookup_minimal_symbol_by_pc (get_frame_pc (fi));
 477
 478       if (msymbol != NULL)
 479         funname = SYMBOL_LINKAGE_NAME (msymbol);
 480       else /* Got no 'funname', code below will fail.  */
 481         error (_("No function found for frame."));
 482     }
 483
 484   /* If comname is NULL, we assume the user wishes to see the
 485      which COMMON blocks are visible here and then return.  */
 486
 487   if (comname == 0)
 488     {
 489       list_all_visible_commons (funname);
 490       return;
 491     }
 492
 493   the_common = find_common_for_function (comname, funname);
 494
 495   if (the_common)
 496     {
 497       if (strcmp (comname, BLANK_COMMON_NAME_LOCAL) == 0)
 498         printf_filtered (_("Contents of blank COMMON block:\n"));
 499       else
 500         printf_filtered (_("Contents of F77 COMMON block '%s':\n"), comname);
 501
 502       printf_filtered ("\n");
 503       entry = the_common->entries;
 504
 505       while (entry != NULL)
 506         {
 507           print_variable_and_value (NULL, entry->symbol, fi, gdb_stdout, 0);
 508           entry = entry->next;
 509         }
 510     }
 511   else
 512     printf_filtered (_("Cannot locate the common block %s in function '%s'\n"),
 513                      comname, funname);
 514 }
 515
 516 /* This function is used to determine whether there is a
 517    F77 common block visible at the current scope called 'comname'.  */
 518
 519 #if 0
 520 static int
 521 there_is_a_visible_common_named (char *comname)
 522 {
 523   SAVED_F77_COMMON_PTR the_common;
 524   struct frame_info *fi;
 525   char *funname = 0;
 526   struct symbol *func;
 527
 528   if (comname == NULL)
 529     error (_("Cannot deal with NULL common name!"));
 530
 531   fi = get_selected_frame (_("No frame selected"));
 532
 533   /* The following is generally ripped off from stack.c's routine
 534      print_frame_info().  */
 535
 536   func = find_pc_function (fi->pc);
 537   if (func)
 538     {
 539       /* In certain pathological cases, the symtabs give the wrong
 540          function (when we are in the first function in a file which
 541          is compiled without debugging symbols, the previous function
 542          is compiled with debugging symbols, and the "foo.o" symbol
 543          that is supposed to tell us where the file with debugging symbols
 544          ends has been truncated by ar because it is longer than 15
 545          characters).
 546
 547          So look in the minimal symbol tables as well, and if it comes
 548          up with a larger address for the function use that instead.
 549          I don't think this can ever cause any problems; there shouldn't
 550          be any minimal symbols in the middle of a function.
 551          FIXME:  (Not necessarily true.  What about text labels?)  */
 552
 553       struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
 554
 555       if (msymbol != NULL
 556           && (SYMBOL_VALUE_ADDRESS (msymbol)
 557               > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
 558         funname = SYMBOL_LINKAGE_NAME (msymbol);
 559       else
 560         funname = SYMBOL_LINKAGE_NAME (func);
 561     }
 562   else
 563     {
 564       struct minimal_symbol *msymbol =
 565         lookup_minimal_symbol_by_pc (fi->pc);
 566
 567       if (msymbol != NULL)
 568         funname = SYMBOL_LINKAGE_NAME (msymbol);
 569     }
 570
 571   the_common = find_common_for_function (comname, funname);
 572
 573   return (the_common ? 1 : 0);
 574 }
 575 #endif
 576
 577 void
 578 _initialize_f_valprint (void)
 579 {
 580   add_info ("common", info_common_command,
 581             _("Print out the values contained in a Fortran COMMON block."));
 582   if (xdb_commands)
 583     add_com ("lc", class_info, info_common_command,
 584              _("Print out the values contained in a Fortran COMMON block."));
 585 }