gdb/f-valprint.c

   1 /* Support for printing Fortran values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2003, 2005, 2006,
   4    2007, 2008, 2009, 2010, 2011 Free Software 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 (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, CORE_ADDR address,
 167                    struct ui_file *stream, int recurse,
 168                    const struct value *val,
 169                    const struct value_print_options *options,
 170                    int *elts)
 171 {
 172   int i;
 173
 174   if (nss != ndimensions)
 175     {
 176       for (i = 0;
 177            (i < F77_DIM_SIZE (nss) && (*elts) < options->print_max);
 178            i++)
 179         {
 180           fprintf_filtered (stream, "( ");
 181           f77_print_array_1 (nss + 1, ndimensions, TYPE_TARGET_TYPE (type),
 182                              valaddr + i * F77_DIM_OFFSET (nss),
 183                              address + i * F77_DIM_OFFSET (nss),
 184                              stream, recurse, val, options, elts);
 185           fprintf_filtered (stream, ") ");
 186         }
 187       if (*elts >= options->print_max && i < F77_DIM_SIZE (nss))
 188         fprintf_filtered (stream, "...");
 189     }
 190   else
 191     {
 192       for (i = 0; i < F77_DIM_SIZE (nss) && (*elts) < options->print_max;
 193            i++, (*elts)++)
 194         {
 195           val_print (TYPE_TARGET_TYPE (type),
 196                      valaddr + i * F77_DIM_OFFSET (ndimensions),
 197                      0,
 198                      address + i * F77_DIM_OFFSET (ndimensions),
 199                      stream, recurse, val, options, current_language);
 200
 201           if (i != (F77_DIM_SIZE (nss) - 1))
 202             fprintf_filtered (stream, ", ");
 203
 204           if ((*elts == options->print_max - 1)
 205               && (i != (F77_DIM_SIZE (nss) - 1)))
 206             fprintf_filtered (stream, "...");
 207         }
 208     }
 209 }
 210
 211 /* This function gets called to print an F77 array, we set up some
 212    stuff and then immediately call f77_print_array_1().  */
 213
 214 static void
 215 f77_print_array (struct type *type, const gdb_byte *valaddr,
 216                  CORE_ADDR address, struct ui_file *stream,
 217                  int recurse,
 218                  const struct value *val,
 219                  const struct value_print_options *options)
 220 {
 221   int ndimensions;
 222   int elts = 0;
 223
 224   ndimensions = calc_f77_array_dims (type);
 225
 226   if (ndimensions > MAX_FORTRAN_DIMS || ndimensions < 0)
 227     error (_("\
 228 Type node corrupt! F77 arrays cannot have %d subscripts (%d Max)"),
 229            ndimensions, MAX_FORTRAN_DIMS);
 230
 231   /* Since F77 arrays are stored column-major, we set up an
 232      offset table to get at the various row's elements.  The
 233      offset table contains entries for both offset and subarray size.  */
 234
 235   f77_create_arrayprint_offset_tbl (type, stream);
 236
 237   f77_print_array_1 (1, ndimensions, type, valaddr, address, stream,
 238                      recurse, val, options, &elts);
 239 }
 240 \f
 241
 242 /* Print data of type TYPE located at VALADDR (within GDB), which came from
 243    the inferior at address ADDRESS, onto stdio stream STREAM according to
 244    OPTIONS.  The data at VALADDR is in target byte order.
 245
 246    If the data are a string pointer, returns the number of string characters
 247    printed.  */
 248
 249 int
 250 f_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 251              CORE_ADDR address, struct ui_file *stream, int recurse,
 252              const struct value *original_value,
 253              const struct value_print_options *options)
 254 {
 255   struct gdbarch *gdbarch = get_type_arch (type);
 256   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 257   unsigned int i = 0;   /* Number of characters printed.  */
 258   struct type *elttype;
 259   LONGEST val;
 260   CORE_ADDR addr;
 261   int index;
 262
 263   CHECK_TYPEDEF (type);
 264   switch (TYPE_CODE (type))
 265     {
 266     case TYPE_CODE_STRING:
 267       f77_get_dynamic_length_of_aggregate (type);
 268       LA_PRINT_STRING (stream, builtin_type (gdbarch)->builtin_char,
 269                        valaddr, TYPE_LENGTH (type), NULL, 0, options);
 270       break;
 271
 272     case TYPE_CODE_ARRAY:
 273       fprintf_filtered (stream, "(");
 274       f77_print_array (type, valaddr, address, stream,
 275                        recurse, original_value, options);
 276       fprintf_filtered (stream, ")");
 277       break;
 278
 279     case TYPE_CODE_PTR:
 280       if (options->format && options->format != 's')
 281         {
 282           print_scalar_formatted (valaddr, type, options, 0, stream);
 283           break;
 284         }
 285       else
 286         {
 287           addr = unpack_pointer (type, valaddr);
 288           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 289
 290           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 291             {
 292               /* Try to print what function it points to.  */
 293               print_address_demangle (gdbarch, addr, stream, demangle);
 294               /* Return value is irrelevant except for string pointers.  */
 295               return 0;
 296             }
 297
 298           if (options->addressprint && options->format != 's')
 299             fputs_filtered (paddress (gdbarch, addr), stream);
 300
 301           /* For a pointer to char or unsigned char, also print the string
 302              pointed to, unless pointer is null.  */
 303           if (TYPE_LENGTH (elttype) == 1
 304               && TYPE_CODE (elttype) == TYPE_CODE_INT
 305               && (options->format == 0 || options->format == 's')
 306               && addr != 0)
 307             i = val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 308                                   stream, options);
 309
 310           /* Return number of characters printed, including the terminating
 311              '\0' if we reached the end.  val_print_string takes care including
 312              the terminating '\0' if necessary.  */
 313           return i;
 314         }
 315       break;
 316
 317     case TYPE_CODE_REF:
 318       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 319       if (options->addressprint)
 320         {
 321           CORE_ADDR addr
 322             = extract_typed_address (valaddr + embedded_offset, type);
 323
 324           fprintf_filtered (stream, "@");
 325           fputs_filtered (paddress (gdbarch, addr), stream);
 326           if (options->deref_ref)
 327             fputs_filtered (": ", stream);
 328         }
 329       /* De-reference the reference.  */
 330       if (options->deref_ref)
 331         {
 332           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 333             {
 334               struct value *deref_val =
 335                 value_at
 336                 (TYPE_TARGET_TYPE (type),
 337                  unpack_pointer (type, valaddr + embedded_offset));
 338
 339               common_val_print (deref_val, stream, recurse,
 340                                 options, current_language);
 341             }
 342           else
 343             fputs_filtered ("???", stream);
 344         }
 345       break;
 346
 347     case TYPE_CODE_FUNC:
 348       if (options->format)
 349         {
 350           print_scalar_formatted (valaddr, type, options, 0, stream);
 351           break;
 352         }
 353       /* FIXME, we should consider, at least for ANSI C language, eliminating
 354          the distinction made between FUNCs and POINTERs to FUNCs.  */
 355       fprintf_filtered (stream, "{");
 356       type_print (type, "", stream, -1);
 357       fprintf_filtered (stream, "} ");
 358       /* Try to print what function it points to, and its address.  */
 359       print_address_demangle (gdbarch, address, stream, demangle);
 360       break;
 361
 362     case TYPE_CODE_INT:
 363       if (options->format || options->output_format)
 364         {
 365           struct value_print_options opts = *options;
 366
 367           opts.format = (options->format ? options->format
 368                          : options->output_format);
 369           print_scalar_formatted (valaddr, type, &opts, 0, stream);
 370         }
 371       else
 372         {
 373           val_print_type_code_int (type, valaddr, stream);
 374           /* C and C++ has no single byte int type, char is used instead.
 375              Since we don't know whether the value is really intended to
 376              be used as an integer or a character, print the character
 377              equivalent as well.  */
 378           if (TYPE_LENGTH (type) == 1)
 379             {
 380               fputs_filtered (" ", stream);
 381               LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
 382                              type, stream);
 383             }
 384         }
 385       break;
 386
 387     case TYPE_CODE_FLAGS:
 388       if (options->format)
 389           print_scalar_formatted (valaddr, type, options, 0, stream);
 390       else
 391         val_print_type_code_flags (type, valaddr, stream);
 392       break;
 393
 394     case TYPE_CODE_FLT:
 395       if (options->format)
 396         print_scalar_formatted (valaddr, type, options, 0, stream);
 397       else
 398         print_floating (valaddr, type, stream);
 399       break;
 400
 401     case TYPE_CODE_VOID:
 402       fprintf_filtered (stream, "VOID");
 403       break;
 404
 405     case TYPE_CODE_ERROR:
 406       fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
 407       break;
 408
 409     case TYPE_CODE_RANGE:
 410       /* FIXME, we should not ever have to print one of these yet.  */
 411       fprintf_filtered (stream, "<range type>");
 412       break;
 413
 414     case TYPE_CODE_BOOL:
 415       if (options->format || options->output_format)
 416         {
 417           struct value_print_options opts = *options;
 418
 419           opts.format = (options->format ? options->format
 420                          : options->output_format);
 421           print_scalar_formatted (valaddr, type, &opts, 0, stream);
 422         }
 423       else
 424         {
 425           val = extract_unsigned_integer (valaddr,
 426                                           TYPE_LENGTH (type), byte_order);
 427           if (val == 0)
 428             fprintf_filtered (stream, ".FALSE.");
 429           else if (val == 1)
 430             fprintf_filtered (stream, ".TRUE.");
 431           else
 432             /* Not a legitimate logical type, print as an integer.  */
 433             {
 434               /* Bash the type code temporarily.  */
 435               TYPE_CODE (type) = TYPE_CODE_INT;
 436               val_print (type, valaddr, 0, address, stream, recurse,
 437                          original_value, options, current_language);
 438               /* Restore the type code so later uses work as intended.  */
 439               TYPE_CODE (type) = TYPE_CODE_BOOL;
 440             }
 441         }
 442       break;
 443
 444     case TYPE_CODE_COMPLEX:
 445       type = TYPE_TARGET_TYPE (type);
 446       fputs_filtered ("(", stream);
 447       print_floating (valaddr, type, stream);
 448       fputs_filtered (",", stream);
 449       print_floating (valaddr + TYPE_LENGTH (type), type, stream);
 450       fputs_filtered (")", stream);
 451       break;
 452
 453     case TYPE_CODE_UNDEF:
 454       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 455          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 456          and no complete type for struct foo in that file.  */
 457       fprintf_filtered (stream, "<incomplete type>");
 458       break;
 459
 460     case TYPE_CODE_STRUCT:
 461     case TYPE_CODE_UNION:
 462       /* Starting from the Fortran 90 standard, Fortran supports derived
 463          types.  */
 464       fprintf_filtered (stream, "( ");
 465       for (index = 0; index < TYPE_NFIELDS (type); index++)
 466         {
 467           int offset = TYPE_FIELD_BITPOS (type, index) / 8;
 468
 469           val_print (TYPE_FIELD_TYPE (type, index), valaddr + offset,
 470                      embedded_offset, address, stream, recurse + 1,
 471                      original_value, options, current_language);
 472           if (index != TYPE_NFIELDS (type) - 1)
 473             fputs_filtered (", ", stream);
 474         }
 475       fprintf_filtered (stream, " )");
 476       break;
 477
 478     default:
 479       error (_("Invalid F77 type code %d in symbol table."), TYPE_CODE (type));
 480     }
 481   gdb_flush (stream);
 482   return 0;
 483 }
 484
 485 static void
 486 list_all_visible_commons (char *funname)
 487 {
 488   SAVED_F77_COMMON_PTR tmp;
 489
 490   tmp = head_common_list;
 491
 492   printf_filtered (_("All COMMON blocks visible at this level:\n\n"));
 493
 494   while (tmp != NULL)
 495     {
 496       if (strcmp (tmp->owning_function, funname) == 0)
 497         printf_filtered ("%s\n", tmp->name);
 498
 499       tmp = tmp->next;
 500     }
 501 }
 502
 503 /* This function is used to print out the values in a given COMMON
 504    block.  It will always use the most local common block of the
 505    given name.  */
 506
 507 static void
 508 info_common_command (char *comname, int from_tty)
 509 {
 510   SAVED_F77_COMMON_PTR the_common;
 511   COMMON_ENTRY_PTR entry;
 512   struct frame_info *fi;
 513   char *funname = 0;
 514   struct symbol *func;
 515
 516   /* We have been told to display the contents of F77 COMMON
 517      block supposedly visible in this function.  Let us
 518      first make sure that it is visible and if so, let
 519      us display its contents.  */
 520
 521   fi = get_selected_frame (_("No frame selected"));
 522
 523   /* The following is generally ripped off from stack.c's routine
 524      print_frame_info().  */
 525
 526   func = find_pc_function (get_frame_pc (fi));
 527   if (func)
 528     {
 529       /* In certain pathological cases, the symtabs give the wrong
 530          function (when we are in the first function in a file which
 531          is compiled without debugging symbols, the previous function
 532          is compiled with debugging symbols, and the "foo.o" symbol
 533          that is supposed to tell us where the file with debugging symbols
 534          ends has been truncated by ar because it is longer than 15
 535          characters).
 536
 537          So look in the minimal symbol tables as well, and if it comes
 538          up with a larger address for the function use that instead.
 539          I don't think this can ever cause any problems; there shouldn't
 540          be any minimal symbols in the middle of a function.
 541          FIXME:  (Not necessarily true.  What about text labels?)  */
 542
 543       struct minimal_symbol *msymbol =
 544         lookup_minimal_symbol_by_pc (get_frame_pc (fi));
 545
 546       if (msymbol != NULL
 547           && (SYMBOL_VALUE_ADDRESS (msymbol)
 548               > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
 549         funname = SYMBOL_LINKAGE_NAME (msymbol);
 550       else
 551         funname = SYMBOL_LINKAGE_NAME (func);
 552     }
 553   else
 554     {
 555       struct minimal_symbol *msymbol =
 556         lookup_minimal_symbol_by_pc (get_frame_pc (fi));
 557
 558       if (msymbol != NULL)
 559         funname = SYMBOL_LINKAGE_NAME (msymbol);
 560       else /* Got no 'funname', code below will fail.  */
 561         error (_("No function found for frame."));
 562     }
 563
 564   /* If comname is NULL, we assume the user wishes to see the
 565      which COMMON blocks are visible here and then return.  */
 566
 567   if (comname == 0)
 568     {
 569       list_all_visible_commons (funname);
 570       return;
 571     }
 572
 573   the_common = find_common_for_function (comname, funname);
 574
 575   if (the_common)
 576     {
 577       if (strcmp (comname, BLANK_COMMON_NAME_LOCAL) == 0)
 578         printf_filtered (_("Contents of blank COMMON block:\n"));
 579       else
 580         printf_filtered (_("Contents of F77 COMMON block '%s':\n"), comname);
 581
 582       printf_filtered ("\n");
 583       entry = the_common->entries;
 584
 585       while (entry != NULL)
 586         {
 587           print_variable_and_value (NULL, entry->symbol, fi, gdb_stdout, 0);
 588           entry = entry->next;
 589         }
 590     }
 591   else
 592     printf_filtered (_("Cannot locate the common block %s in function '%s'\n"),
 593                      comname, funname);
 594 }
 595
 596 /* This function is used to determine whether there is a
 597    F77 common block visible at the current scope called 'comname'.  */
 598
 599 #if 0
 600 static int
 601 there_is_a_visible_common_named (char *comname)
 602 {
 603   SAVED_F77_COMMON_PTR the_common;
 604   struct frame_info *fi;
 605   char *funname = 0;
 606   struct symbol *func;
 607
 608   if (comname == NULL)
 609     error (_("Cannot deal with NULL common name!"));
 610
 611   fi = get_selected_frame (_("No frame selected"));
 612
 613   /* The following is generally ripped off from stack.c's routine
 614      print_frame_info().  */
 615
 616   func = find_pc_function (fi->pc);
 617   if (func)
 618     {
 619       /* In certain pathological cases, the symtabs give the wrong
 620          function (when we are in the first function in a file which
 621          is compiled without debugging symbols, the previous function
 622          is compiled with debugging symbols, and the "foo.o" symbol
 623          that is supposed to tell us where the file with debugging symbols
 624          ends has been truncated by ar because it is longer than 15
 625          characters).
 626
 627          So look in the minimal symbol tables as well, and if it comes
 628          up with a larger address for the function use that instead.
 629          I don't think this can ever cause any problems; there shouldn't
 630          be any minimal symbols in the middle of a function.
 631          FIXME:  (Not necessarily true.  What about text labels?)  */
 632
 633       struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
 634
 635       if (msymbol != NULL
 636           && (SYMBOL_VALUE_ADDRESS (msymbol)
 637               > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
 638         funname = SYMBOL_LINKAGE_NAME (msymbol);
 639       else
 640         funname = SYMBOL_LINKAGE_NAME (func);
 641     }
 642   else
 643     {
 644       struct minimal_symbol *msymbol =
 645         lookup_minimal_symbol_by_pc (fi->pc);
 646
 647       if (msymbol != NULL)
 648         funname = SYMBOL_LINKAGE_NAME (msymbol);
 649     }
 650
 651   the_common = find_common_for_function (comname, funname);
 652
 653   return (the_common ? 1 : 0);
 654 }
 655 #endif
 656
 657 void
 658 _initialize_f_valprint (void)
 659 {
 660   add_info ("common", info_common_command,
 661             _("Print out the values contained in a Fortran COMMON block."));
 662   if (xdb_commands)
 663     add_com ("lc", class_info, info_common_command,
 664              _("Print out the values contained in a Fortran COMMON block."));
 665 }