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   CORE_ADDR addr;
 271   int index;
 272
 273   CHECK_TYPEDEF (type);
 274   switch (TYPE_CODE (type))
 275     {
 276     case TYPE_CODE_STRING:
 277       f77_get_dynamic_length_of_aggregate (type);
 278       LA_PRINT_STRING (stream, builtin_type (gdbarch)->builtin_char,
 279                        valaddr + embedded_offset,
 280                        TYPE_LENGTH (type), NULL, 0, options);
 281       break;
 282
 283     case TYPE_CODE_ARRAY:
 284       if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_CHAR)
 285         {
 286           fprintf_filtered (stream, "(");
 287           f77_print_array (type, valaddr, embedded_offset,
 288                            address, stream, recurse, original_value, options);
 289           fprintf_filtered (stream, ")");
 290         }
 291       else
 292         {
 293           struct type *ch_type = TYPE_TARGET_TYPE (type);
 294
 295           f77_get_dynamic_length_of_aggregate (type);
 296           LA_PRINT_STRING (stream, ch_type,
 297                            valaddr + embedded_offset,
 298                            TYPE_LENGTH (type) / TYPE_LENGTH (ch_type),
 299                            NULL, 0, options);
 300         }
 301       break;
 302
 303     case TYPE_CODE_PTR:
 304       if (options->format && options->format != 's')
 305         {
 306           val_print_scalar_formatted (type, valaddr, embedded_offset,
 307                                       original_value, options, 0, stream);
 308           break;
 309         }
 310       else
 311         {
 312           int want_space = 0;
 313
 314           addr = unpack_pointer (type, valaddr + embedded_offset);
 315           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 316
 317           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 318             {
 319               /* Try to print what function it points to.  */
 320               print_function_pointer_address (options, gdbarch, addr, stream);
 321               return;
 322             }
 323
 324           if (options->symbol_print)
 325             want_space = print_address_demangle (options, gdbarch, addr,
 326                                                  stream, demangle);
 327           else if (options->addressprint && options->format != 's')
 328             {
 329               fputs_filtered (paddress (gdbarch, addr), stream);
 330               want_space = 1;
 331             }
 332
 333           /* For a pointer to char or unsigned char, also print the string
 334              pointed to, unless pointer is null.  */
 335           if (TYPE_LENGTH (elttype) == 1
 336               && TYPE_CODE (elttype) == TYPE_CODE_INT
 337               && (options->format == 0 || options->format == 's')
 338               && addr != 0)
 339             {
 340               if (want_space)
 341                 fputs_filtered (" ", stream);
 342               i = val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 343                                     stream, options);
 344             }
 345           return;
 346         }
 347       break;
 348
 349     case TYPE_CODE_INT:
 350       if (options->format || options->output_format)
 351         {
 352           struct value_print_options opts = *options;
 353
 354           opts.format = (options->format ? options->format
 355                          : options->output_format);
 356           val_print_scalar_formatted (type, valaddr, embedded_offset,
 357                                       original_value, options, 0, stream);
 358         }
 359       else
 360         {
 361           val_print_type_code_int (type, valaddr + embedded_offset, stream);
 362           /* C and C++ has no single byte int type, char is used instead.
 363              Since we don't know whether the value is really intended to
 364              be used as an integer or a character, print the character
 365              equivalent as well.  */
 366           if (TYPE_LENGTH (type) == 1)
 367             {
 368               LONGEST c;
 369
 370               fputs_filtered (" ", stream);
 371               c = unpack_long (type, valaddr + embedded_offset);
 372               LA_PRINT_CHAR ((unsigned char) c, type, stream);
 373             }
 374         }
 375       break;
 376
 377     case TYPE_CODE_STRUCT:
 378     case TYPE_CODE_UNION:
 379       /* Starting from the Fortran 90 standard, Fortran supports derived
 380          types.  */
 381       fprintf_filtered (stream, "( ");
 382       for (index = 0; index < TYPE_NFIELDS (type); index++)
 383         {
 384           int offset = TYPE_FIELD_BITPOS (type, index) / 8;
 385
 386           val_print (TYPE_FIELD_TYPE (type, index), valaddr,
 387                      embedded_offset + offset,
 388                      address, stream, recurse + 1,
 389                      original_value, options, current_language);
 390           if (index != TYPE_NFIELDS (type) - 1)
 391             fputs_filtered (", ", stream);
 392         }
 393       fprintf_filtered (stream, " )");
 394       break;
 395
 396     case TYPE_CODE_REF:
 397     case TYPE_CODE_FUNC:
 398     case TYPE_CODE_FLAGS:
 399     case TYPE_CODE_FLT:
 400     case TYPE_CODE_VOID:
 401     case TYPE_CODE_ERROR:
 402     case TYPE_CODE_RANGE:
 403     case TYPE_CODE_UNDEF:
 404     case TYPE_CODE_COMPLEX:
 405     case TYPE_CODE_BOOL:
 406     case TYPE_CODE_CHAR:
 407     default:
 408       generic_val_print (type, valaddr, embedded_offset, address,
 409                          stream, recurse, original_value, options,
 410                          &f_decorations);
 411       break;
 412     }
 413   gdb_flush (stream);
 414 }
 415
 416 static void
 417 list_all_visible_commons (const char *funname)
 418 {
 419   SAVED_F77_COMMON_PTR tmp;
 420
 421   tmp = head_common_list;
 422
 423   printf_filtered (_("All COMMON blocks visible at this level:\n\n"));
 424
 425   while (tmp != NULL)
 426     {
 427       if (strcmp (tmp->owning_function, funname) == 0)
 428         printf_filtered ("%s\n", tmp->name);
 429
 430       tmp = tmp->next;
 431     }
 432 }
 433
 434 /* This function is used to print out the values in a given COMMON
 435    block.  It will always use the most local common block of the
 436    given name.  */
 437
 438 static void
 439 info_common_command (char *comname, int from_tty)
 440 {
 441   SAVED_F77_COMMON_PTR the_common;
 442   COMMON_ENTRY_PTR entry;
 443   struct frame_info *fi;
 444   const char *funname = 0;
 445   struct symbol *func;
 446
 447   /* We have been told to display the contents of F77 COMMON
 448      block supposedly visible in this function.  Let us
 449      first make sure that it is visible and if so, let
 450      us display its contents.  */
 451
 452   fi = get_selected_frame (_("No frame selected"));
 453
 454   /* The following is generally ripped off from stack.c's routine
 455      print_frame_info().  */
 456
 457   func = find_pc_function (get_frame_pc (fi));
 458   if (func)
 459     {
 460       /* In certain pathological cases, the symtabs give the wrong
 461          function (when we are in the first function in a file which
 462          is compiled without debugging symbols, the previous function
 463          is compiled with debugging symbols, and the "foo.o" symbol
 464          that is supposed to tell us where the file with debugging symbols
 465          ends has been truncated by ar because it is longer than 15
 466          characters).
 467
 468          So look in the minimal symbol tables as well, and if it comes
 469          up with a larger address for the function use that instead.
 470          I don't think this can ever cause any problems; there shouldn't
 471          be any minimal symbols in the middle of a function.
 472          FIXME:  (Not necessarily true.  What about text labels?)  */
 473
 474       struct minimal_symbol *msymbol =
 475         lookup_minimal_symbol_by_pc (get_frame_pc (fi));
 476
 477       if (msymbol != NULL
 478           && (SYMBOL_VALUE_ADDRESS (msymbol)
 479               > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
 480         funname = SYMBOL_LINKAGE_NAME (msymbol);
 481       else
 482         funname = SYMBOL_LINKAGE_NAME (func);
 483     }
 484   else
 485     {
 486       struct minimal_symbol *msymbol =
 487         lookup_minimal_symbol_by_pc (get_frame_pc (fi));
 488
 489       if (msymbol != NULL)
 490         funname = SYMBOL_LINKAGE_NAME (msymbol);
 491       else /* Got no 'funname', code below will fail.  */
 492         error (_("No function found for frame."));
 493     }
 494
 495   /* If comname is NULL, we assume the user wishes to see the
 496      which COMMON blocks are visible here and then return.  */
 497
 498   if (comname == 0)
 499     {
 500       list_all_visible_commons (funname);
 501       return;
 502     }
 503
 504   the_common = find_common_for_function (comname, funname);
 505
 506   if (the_common)
 507     {
 508       struct frame_id frame_id = get_frame_id (fi);
 509
 510       if (strcmp (comname, BLANK_COMMON_NAME_LOCAL) == 0)
 511         printf_filtered (_("Contents of blank COMMON block:\n"));
 512       else
 513         printf_filtered (_("Contents of F77 COMMON block '%s':\n"), comname);
 514
 515       printf_filtered ("\n");
 516       entry = the_common->entries;
 517
 518       while (entry != NULL)
 519         {
 520           fi = frame_find_by_id (frame_id);
 521           if (fi == NULL)
 522             {
 523               warning (_("Unable to restore previously selected frame."));
 524               break;
 525             }
 526
 527           print_variable_and_value (NULL, entry->symbol, fi, gdb_stdout, 0);
 528
 529           /* print_variable_and_value invalidates FI.  */
 530           fi = NULL;
 531
 532           entry = entry->next;
 533         }
 534     }
 535   else
 536     printf_filtered (_("Cannot locate the common block %s in function '%s'\n"),
 537                      comname, funname);
 538 }
 539
 540 /* This function is used to determine whether there is a
 541    F77 common block visible at the current scope called 'comname'.  */
 542
 543 #if 0
 544 static int
 545 there_is_a_visible_common_named (char *comname)
 546 {
 547   SAVED_F77_COMMON_PTR the_common;
 548   struct frame_info *fi;
 549   char *funname = 0;
 550   struct symbol *func;
 551
 552   if (comname == NULL)
 553     error (_("Cannot deal with NULL common name!"));
 554
 555   fi = get_selected_frame (_("No frame selected"));
 556
 557   /* The following is generally ripped off from stack.c's routine
 558      print_frame_info().  */
 559
 560   func = find_pc_function (fi->pc);
 561   if (func)
 562     {
 563       /* In certain pathological cases, the symtabs give the wrong
 564          function (when we are in the first function in a file which
 565          is compiled without debugging symbols, the previous function
 566          is compiled with debugging symbols, and the "foo.o" symbol
 567          that is supposed to tell us where the file with debugging symbols
 568          ends has been truncated by ar because it is longer than 15
 569          characters).
 570
 571          So look in the minimal symbol tables as well, and if it comes
 572          up with a larger address for the function use that instead.
 573          I don't think this can ever cause any problems; there shouldn't
 574          be any minimal symbols in the middle of a function.
 575          FIXME:  (Not necessarily true.  What about text labels?)  */
 576
 577       struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
 578
 579       if (msymbol != NULL
 580           && (SYMBOL_VALUE_ADDRESS (msymbol)
 581               > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
 582         funname = SYMBOL_LINKAGE_NAME (msymbol);
 583       else
 584         funname = SYMBOL_LINKAGE_NAME (func);
 585     }
 586   else
 587     {
 588       struct minimal_symbol *msymbol =
 589         lookup_minimal_symbol_by_pc (fi->pc);
 590
 591       if (msymbol != NULL)
 592         funname = SYMBOL_LINKAGE_NAME (msymbol);
 593     }
 594
 595   the_common = find_common_for_function (comname, funname);
 596
 597   return (the_common ? 1 : 0);
 598 }
 599 #endif
 600
 601 void
 602 _initialize_f_valprint (void)
 603 {
 604   add_info ("common", info_common_command,
 605             _("Print out the values contained in a Fortran COMMON block."));
 606   if (xdb_commands)
 607     add_com ("lc", class_info, info_common_command,
 608              _("Print out the values contained in a Fortran COMMON block."));
 609 }