gdb/language.c

   1 /* Multiple source language support for GDB.
   2
   3    Copyright (C) 1991-2017 Free Software Foundation, Inc.
   4
   5    Contributed by the Department of Computer Science at the State University
   6    of New York at Buffalo.
   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 /* This file contains functions that return things that are specific
  24    to languages.  Each function should examine current_language if necessary,
  25    and return the appropriate result.  */
  26
  27 /* FIXME:  Most of these would be better organized as macros which
  28    return data out of a "language-specific" struct pointer that is set
  29    whenever the working language changes.  That would be a lot faster.  */
  30
  31 #include "defs.h"
  32 #include <ctype.h>
  33 #include "symtab.h"
  34 #include "gdbtypes.h"
  35 #include "value.h"
  36 #include "gdbcmd.h"
  37 #include "expression.h"
  38 #include "language.h"
  39 #include "varobj.h"
  40 #include "target.h"
  41 #include "parser-defs.h"
  42 #include "demangle.h"
  43 #include "symfile.h"
  44 #include "cp-support.h"
  45 #include "frame.h"
  46 #include "c-lang.h"
  47 #include <algorithm>
  48
  49 static void unk_lang_error (const char *);
  50
  51 static int unk_lang_parser (struct parser_state *);
  52
  53 static void set_range_case (void);
  54
  55 static void unk_lang_emit_char (int c, struct type *type,
  56                                 struct ui_file *stream, int quoter);
  57
  58 static void unk_lang_printchar (int c, struct type *type,
  59                                 struct ui_file *stream);
  60
  61 static void unk_lang_value_print (struct value *, struct ui_file *,
  62                                   const struct value_print_options *);
  63
  64 static CORE_ADDR unk_lang_trampoline (struct frame_info *, CORE_ADDR pc);
  65
  66 /* Forward declaration */
  67 extern const struct language_defn unknown_language_defn;
  68
  69 /* The current (default at startup) state of type and range checking.
  70    (If the modes are set to "auto", though, these are changed based
  71    on the default language at startup, and then again based on the
  72    language of the first source file.  */
  73
  74 enum range_mode range_mode = range_mode_auto;
  75 enum range_check range_check = range_check_off;
  76 enum case_mode case_mode = case_mode_auto;
  77 enum case_sensitivity case_sensitivity = case_sensitive_on;
  78
  79 /* The current language and language_mode (see language.h).  */
  80
  81 const struct language_defn *current_language = &unknown_language_defn;
  82 enum language_mode language_mode = language_mode_auto;
  83
  84 /* The language that the user expects to be typing in (the language
  85    of main(), or the last language we notified them about, or C).  */
  86
  87 const struct language_defn *expected_language;
  88
  89 /* The list of supported languages.  Keep this in the same order as
  90    the 'enum language' values.  */
  91
  92 static const struct language_defn *languages[] = {
  93   &unknown_language_defn,
  94   &auto_language_defn,
  95   &c_language_defn,
  96   &objc_language_defn,
  97   &cplus_language_defn,
  98   &d_language_defn,
  99   &go_language_defn,
 100   &f_language_defn,
 101   &m2_language_defn,
 102   &asm_language_defn,
 103   &pascal_language_defn,
 104   &opencl_language_defn,
 105   &rust_language_defn,
 106   &minimal_language_defn,
 107   &ada_language_defn,
 108 };
 109
 110 /* The current values of the "set language/type/range" enum
 111    commands.  */
 112 static const char *language;
 113 static const char *type;
 114 static const char *range;
 115 static const char *case_sensitive;
 116
 117 /* Warning issued when current_language and the language of the current
 118    frame do not match.  */
 119 char lang_frame_mismatch_warn[] =
 120 "Warning: the current language does not match this frame.";
 121 \f
 122 /* This page contains the functions corresponding to GDB commands
 123    and their helpers.  */
 124
 125 /* Show command.  Display a warning if the language set
 126    does not match the frame.  */
 127 static void
 128 show_language_command (struct ui_file *file, int from_tty,
 129                        struct cmd_list_element *c, const char *value)
 130 {
 131   enum language flang;          /* The language of the frame.  */
 132
 133   if (language_mode == language_mode_auto)
 134     fprintf_filtered (gdb_stdout,
 135                       _("The current source language is "
 136                         "\"auto; currently %s\".\n"),
 137                       current_language->la_name);
 138   else
 139     fprintf_filtered (gdb_stdout,
 140                       _("The current source language is \"%s\".\n"),
 141                       current_language->la_name);
 142
 143   if (has_stack_frames ())
 144     {
 145       struct frame_info *frame;
 146
 147       frame = get_selected_frame (NULL);
 148       flang = get_frame_language (frame);
 149       if (flang != language_unknown
 150           && language_mode == language_mode_manual
 151           && current_language->la_language != flang)
 152         printf_filtered ("%s\n", lang_frame_mismatch_warn);
 153     }
 154 }
 155
 156 /* Set command.  Change the current working language.  */
 157 static void
 158 set_language_command (const char *ignore,
 159                       int from_tty, struct cmd_list_element *c)
 160 {
 161   enum language flang = language_unknown;
 162
 163   /* "local" is a synonym of "auto".  */
 164   if (strcmp (language, "local") == 0)
 165     language = "auto";
 166
 167   /* Search the list of languages for a match.  */
 168   for (const auto &lang : languages)
 169     {
 170       if (strcmp (lang->la_name, language) == 0)
 171         {
 172           /* Found it!  Go into manual mode, and use this language.  */
 173           if (lang->la_language == language_auto)
 174             {
 175               /* Enter auto mode.  Set to the current frame's language, if
 176                  known, or fallback to the initial language.  */
 177               language_mode = language_mode_auto;
 178               TRY
 179                 {
 180                   struct frame_info *frame;
 181
 182                   frame = get_selected_frame (NULL);
 183                   flang = get_frame_language (frame);
 184                 }
 185               CATCH (ex, RETURN_MASK_ERROR)
 186                 {
 187                   flang = language_unknown;
 188                 }
 189               END_CATCH
 190
 191               if (flang != language_unknown)
 192                 set_language (flang);
 193               else
 194                 set_initial_language ();
 195               expected_language = current_language;
 196               return;
 197             }
 198           else
 199             {
 200               /* Enter manual mode.  Set the specified language.  */
 201               language_mode = language_mode_manual;
 202               current_language = lang;
 203               set_range_case ();
 204               expected_language = current_language;
 205               return;
 206             }
 207         }
 208     }
 209
 210   internal_error (__FILE__, __LINE__,
 211                   "Couldn't find language `%s' in known languages list.",
 212                   language);
 213 }
 214
 215 /* Show command.  Display a warning if the range setting does
 216    not match the current language.  */
 217 static void
 218 show_range_command (struct ui_file *file, int from_tty,
 219                     struct cmd_list_element *c, const char *value)
 220 {
 221   if (range_mode == range_mode_auto)
 222     {
 223       const char *tmp;
 224
 225       switch (range_check)
 226         {
 227         case range_check_on:
 228           tmp = "on";
 229           break;
 230         case range_check_off:
 231           tmp = "off";
 232           break;
 233         case range_check_warn:
 234           tmp = "warn";
 235           break;
 236         default:
 237           internal_error (__FILE__, __LINE__,
 238                           "Unrecognized range check setting.");
 239         }
 240
 241       fprintf_filtered (gdb_stdout,
 242                         _("Range checking is \"auto; currently %s\".\n"),
 243                         tmp);
 244     }
 245   else
 246     fprintf_filtered (gdb_stdout, _("Range checking is \"%s\".\n"),
 247                       value);
 248
 249   if (range_check != current_language->la_range_check)
 250     warning (_("the current range check setting "
 251                "does not match the language.\n"));
 252 }
 253
 254 /* Set command.  Change the setting for range checking.  */
 255 static void
 256 set_range_command (const char *ignore,
 257                    int from_tty, struct cmd_list_element *c)
 258 {
 259   if (strcmp (range, "on") == 0)
 260     {
 261       range_check = range_check_on;
 262       range_mode = range_mode_manual;
 263     }
 264   else if (strcmp (range, "warn") == 0)
 265     {
 266       range_check = range_check_warn;
 267       range_mode = range_mode_manual;
 268     }
 269   else if (strcmp (range, "off") == 0)
 270     {
 271       range_check = range_check_off;
 272       range_mode = range_mode_manual;
 273     }
 274   else if (strcmp (range, "auto") == 0)
 275     {
 276       range_mode = range_mode_auto;
 277       set_range_case ();
 278       return;
 279     }
 280   else
 281     {
 282       internal_error (__FILE__, __LINE__,
 283                       _("Unrecognized range check setting: \"%s\""), range);
 284     }
 285   if (range_check != current_language->la_range_check)
 286     warning (_("the current range check setting "
 287                "does not match the language.\n"));
 288 }
 289
 290 /* Show command.  Display a warning if the case sensitivity setting does
 291    not match the current language.  */
 292 static void
 293 show_case_command (struct ui_file *file, int from_tty,
 294                    struct cmd_list_element *c, const char *value)
 295 {
 296   if (case_mode == case_mode_auto)
 297     {
 298       const char *tmp = NULL;
 299
 300       switch (case_sensitivity)
 301         {
 302         case case_sensitive_on:
 303           tmp = "on";
 304           break;
 305         case case_sensitive_off:
 306           tmp = "off";
 307           break;
 308         default:
 309           internal_error (__FILE__, __LINE__,
 310                           "Unrecognized case-sensitive setting.");
 311         }
 312
 313       fprintf_filtered (gdb_stdout,
 314                         _("Case sensitivity in "
 315                           "name search is \"auto; currently %s\".\n"),
 316                         tmp);
 317     }
 318   else
 319     fprintf_filtered (gdb_stdout,
 320                       _("Case sensitivity in name search is \"%s\".\n"),
 321                       value);
 322
 323   if (case_sensitivity != current_language->la_case_sensitivity)
 324     warning (_("the current case sensitivity setting does not match "
 325                "the language.\n"));
 326 }
 327
 328 /* Set command.  Change the setting for case sensitivity.  */
 329
 330 static void
 331 set_case_command (const char *ignore, int from_tty, struct cmd_list_element *c)
 332 {
 333    if (strcmp (case_sensitive, "on") == 0)
 334      {
 335        case_sensitivity = case_sensitive_on;
 336        case_mode = case_mode_manual;
 337      }
 338    else if (strcmp (case_sensitive, "off") == 0)
 339      {
 340        case_sensitivity = case_sensitive_off;
 341        case_mode = case_mode_manual;
 342      }
 343    else if (strcmp (case_sensitive, "auto") == 0)
 344      {
 345        case_mode = case_mode_auto;
 346        set_range_case ();
 347        return;
 348      }
 349    else
 350      {
 351        internal_error (__FILE__, __LINE__,
 352                        "Unrecognized case-sensitive setting: \"%s\"",
 353                        case_sensitive);
 354      }
 355
 356    if (case_sensitivity != current_language->la_case_sensitivity)
 357      warning (_("the current case sensitivity setting does not match "
 358                 "the language.\n"));
 359 }
 360
 361 /* Set the status of range and type checking and case sensitivity based on
 362    the current modes and the current language.
 363    If SHOW is non-zero, then print out the current language,
 364    type and range checking status.  */
 365 static void
 366 set_range_case (void)
 367 {
 368   if (range_mode == range_mode_auto)
 369     range_check = current_language->la_range_check;
 370
 371   if (case_mode == case_mode_auto)
 372     case_sensitivity = current_language->la_case_sensitivity;
 373 }
 374
 375 /* Set current language to (enum language) LANG.  Returns previous
 376    language.  */
 377
 378 enum language
 379 set_language (enum language lang)
 380 {
 381   enum language prev_language;
 382
 383   prev_language = current_language->la_language;
 384   current_language = languages[lang];
 385   set_range_case ();
 386   return prev_language;
 387 }
 388 \f
 389
 390 /* Print out the current language settings: language, range and
 391    type checking.  If QUIETLY, print only what has changed.  */
 392
 393 void
 394 language_info (int quietly)
 395 {
 396   if (quietly && expected_language == current_language)
 397     return;
 398
 399   expected_language = current_language;
 400   printf_unfiltered (_("Current language:  %s\n"), language);
 401   show_language_command (NULL, 1, NULL, NULL);
 402
 403   if (!quietly)
 404     {
 405       printf_unfiltered (_("Range checking:    %s\n"), range);
 406       show_range_command (NULL, 1, NULL, NULL);
 407       printf_unfiltered (_("Case sensitivity:  %s\n"), case_sensitive);
 408       show_case_command (NULL, 1, NULL, NULL);
 409     }
 410 }
 411 \f
 412
 413 /* Returns non-zero if the value is a pointer type.  */
 414 int
 415 pointer_type (struct type *type)
 416 {
 417   return TYPE_CODE (type) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (type);
 418 }
 419
 420 \f
 421 /* This page contains functions that return info about
 422    (struct value) values used in GDB.  */
 423
 424 /* Returns non-zero if the value VAL represents a true value.  */
 425 int
 426 value_true (struct value *val)
 427 {
 428   /* It is possible that we should have some sort of error if a non-boolean
 429      value is used in this context.  Possibly dependent on some kind of
 430      "boolean-checking" option like range checking.  But it should probably
 431      not depend on the language except insofar as is necessary to identify
 432      a "boolean" value (i.e. in C using a float, pointer, etc., as a boolean
 433      should be an error, probably).  */
 434   return !value_logical_not (val);
 435 }
 436 \f
 437 /* This page contains functions for the printing out of
 438    error messages that occur during type- and range-
 439    checking.  */
 440
 441 /* This is called when a language fails a range-check.  The
 442    first argument should be a printf()-style format string, and the
 443    rest of the arguments should be its arguments.  If range_check is
 444    range_check_on, an error is printed;  if range_check_warn, a warning;
 445    otherwise just the message.  */
 446
 447 void
 448 range_error (const char *string,...)
 449 {
 450   va_list args;
 451
 452   va_start (args, string);
 453   switch (range_check)
 454     {
 455     case range_check_warn:
 456       vwarning (string, args);
 457       break;
 458     case range_check_on:
 459       verror (string, args);
 460       break;
 461     case range_check_off:
 462       /* FIXME: cagney/2002-01-30: Should this function print anything
 463          when range error is off?  */
 464       vfprintf_filtered (gdb_stderr, string, args);
 465       fprintf_filtered (gdb_stderr, "\n");
 466       break;
 467     default:
 468       internal_error (__FILE__, __LINE__, _("bad switch"));
 469     }
 470   va_end (args);
 471 }
 472 \f
 473
 474 /* This page contains miscellaneous functions.  */
 475
 476 /* Return the language enum for a given language string.  */
 477
 478 enum language
 479 language_enum (const char *str)
 480 {
 481   for (const auto &lang : languages)
 482     if (strcmp (lang->la_name, str) == 0)
 483       return lang->la_language;
 484
 485   if (strcmp (str, "local") == 0)
 486     return language_auto;
 487
 488   return language_unknown;
 489 }
 490
 491 /* Return the language struct for a given language enum.  */
 492
 493 const struct language_defn *
 494 language_def (enum language lang)
 495 {
 496   return languages[lang];
 497 }
 498
 499 /* Return the language as a string.  */
 500
 501 const char *
 502 language_str (enum language lang)
 503 {
 504   return languages[lang]->la_name;
 505 }
 506
 507 static void
 508 set_check (const char *ignore, int from_tty)
 509 {
 510   printf_unfiltered (
 511      "\"set check\" must be followed by the name of a check subcommand.\n");
 512   help_list (setchecklist, "set check ", all_commands, gdb_stdout);
 513 }
 514
 515 static void
 516 show_check (const char *ignore, int from_tty)
 517 {
 518   cmd_show_list (showchecklist, from_tty, "");
 519 }
 520 \f
 521
 522 /* Build and install the "set language LANG" command.  */
 523
 524 static void
 525 add_set_language_command ()
 526 {
 527   static const char **language_names;
 528
 529   /* Build the language names array, to be used as enumeration in the
 530      "set language" enum command.  +1 for "local" and +1 for NULL
 531      termination.  */
 532   language_names = new const char *[ARRAY_SIZE (languages) + 2];
 533
 534   /* Display "auto", "local" and "unknown" first, and then the rest,
 535      alpha sorted.  */
 536   const char **language_names_p = language_names;
 537   *language_names_p++ = auto_language_defn.la_name;
 538   *language_names_p++ = "local";
 539   *language_names_p++ = unknown_language_defn.la_name;
 540   const char **sort_begin = language_names_p;
 541   for (const auto &lang : languages)
 542     {
 543       /* Already handled above.  */
 544       if (lang->la_language == language_auto
 545           || lang->la_language == language_unknown)
 546         continue;
 547       *language_names_p++ = lang->la_name;
 548     }
 549   *language_names_p = NULL;
 550   std::sort (sort_begin, language_names_p, compare_cstrings);
 551
 552   /* Add the filename extensions.  */
 553   for (const auto &lang : languages)
 554     if (lang->la_filename_extensions != NULL)
 555       {
 556         for (size_t i = 0; lang->la_filename_extensions[i] != NULL; ++i)
 557           add_filename_language (lang->la_filename_extensions[i],
 558                                  lang->la_language);
 559       }
 560
 561   /* Build the "help set language" docs.  */
 562   string_file doc;
 563
 564   doc.printf (_("Set the current source language.\n"
 565                 "The currently understood settings are:\n\nlocal or "
 566                 "auto    Automatic setting based on source file\n"));
 567
 568   for (const auto &lang : languages)
 569     {
 570       /* Already dealt with these above.  */
 571       if (lang->la_language == language_unknown
 572           || lang->la_language == language_auto)
 573         continue;
 574
 575       /* FIXME: i18n: for now assume that the human-readable name is
 576          just a capitalization of the internal name.  */
 577       doc.printf ("%-16s Use the %c%s language\n",
 578                   lang->la_name,
 579                   /* Capitalize first letter of language name.  */
 580                   toupper (lang->la_name[0]),
 581                   lang->la_name + 1);
 582     }
 583
 584   add_setshow_enum_cmd ("language", class_support,
 585                         language_names,
 586                         &language,
 587                         doc.c_str (),
 588                         _("Show the current source language."),
 589                         NULL, set_language_command,
 590                         show_language_command,
 591                         &setlist, &showlist);
 592 }
 593
 594 /* Iterate through all registered languages looking for and calling
 595    any non-NULL struct language_defn.skip_trampoline() functions.
 596    Return the result from the first that returns non-zero, or 0 if all
 597    `fail'.  */
 598 CORE_ADDR
 599 skip_language_trampoline (struct frame_info *frame, CORE_ADDR pc)
 600 {
 601   for (const auto &lang : languages)
 602     {
 603       if (lang->skip_trampoline != NULL)
 604         {
 605           CORE_ADDR real_pc = lang->skip_trampoline (frame, pc);
 606
 607           if (real_pc)
 608             return real_pc;
 609         }
 610     }
 611
 612   return 0;
 613 }
 614
 615 /* Return demangled language symbol, or NULL.
 616    FIXME: Options are only useful for certain languages and ignored
 617    by others, so it would be better to remove them here and have a
 618    more flexible demangler for the languages that need it.
 619    FIXME: Sometimes the demangler is invoked when we don't know the
 620    language, so we can't use this everywhere.  */
 621 char *
 622 language_demangle (const struct language_defn *current_language,
 623                                 const char *mangled, int options)
 624 {
 625   if (current_language != NULL && current_language->la_demangle)
 626     return current_language->la_demangle (mangled, options);
 627   return NULL;
 628 }
 629
 630 /* See langauge.h.  */
 631
 632 int
 633 language_sniff_from_mangled_name (const struct language_defn *lang,
 634                                   const char *mangled, char **demangled)
 635 {
 636   gdb_assert (lang != NULL);
 637
 638   if (lang->la_sniff_from_mangled_name == NULL)
 639     {
 640       *demangled = NULL;
 641       return 0;
 642     }
 643
 644   return lang->la_sniff_from_mangled_name (mangled, demangled);
 645 }
 646
 647 /* Return class name from physname or NULL.  */
 648 char *
 649 language_class_name_from_physname (const struct language_defn *lang,
 650                                    const char *physname)
 651 {
 652   if (lang != NULL && lang->la_class_name_from_physname)
 653     return lang->la_class_name_from_physname (physname);
 654   return NULL;
 655 }
 656
 657 /* Return non-zero if TYPE should be passed (and returned) by
 658    reference at the language level.  */
 659 int
 660 language_pass_by_reference (struct type *type)
 661 {
 662   return current_language->la_pass_by_reference (type);
 663 }
 664
 665 /* Return zero; by default, types are passed by value at the language
 666    level.  The target ABI may pass or return some structs by reference
 667    independent of this.  */
 668 int
 669 default_pass_by_reference (struct type *type)
 670 {
 671   return 0;
 672 }
 673
 674 /* Return the default string containing the list of characters
 675    delimiting words.  This is a reasonable default value that
 676    most languages should be able to use.  */
 677
 678 const char *
 679 default_word_break_characters (void)
 680 {
 681   return " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-";
 682 }
 683
 684 /* Print the index of array elements using the C99 syntax.  */
 685
 686 void
 687 default_print_array_index (struct value *index_value, struct ui_file *stream,
 688                            const struct value_print_options *options)
 689 {
 690   fprintf_filtered (stream, "[");
 691   LA_VALUE_PRINT (index_value, stream, options);
 692   fprintf_filtered (stream, "] = ");
 693 }
 694
 695 void
 696 default_get_string (struct value *value, gdb_byte **buffer, int *length,
 697                     struct type **char_type, const char **charset)
 698 {
 699   error (_("Getting a string is unsupported in this language."));
 700 }
 701
 702 /* Define the language that is no language.  */
 703
 704 static int
 705 unk_lang_parser (struct parser_state *ps)
 706 {
 707   return 1;
 708 }
 709
 710 static void
 711 unk_lang_error (const char *msg)
 712 {
 713   error (_("Attempted to parse an expression with unknown language"));
 714 }
 715
 716 static void
 717 unk_lang_emit_char (int c, struct type *type, struct ui_file *stream,
 718                     int quoter)
 719 {
 720   error (_("internal error - unimplemented "
 721            "function unk_lang_emit_char called."));
 722 }
 723
 724 static void
 725 unk_lang_printchar (int c, struct type *type, struct ui_file *stream)
 726 {
 727   error (_("internal error - unimplemented "
 728            "function unk_lang_printchar called."));
 729 }
 730
 731 static void
 732 unk_lang_printstr (struct ui_file *stream, struct type *type,
 733                    const gdb_byte *string, unsigned int length,
 734                    const char *encoding, int force_ellipses,
 735                    const struct value_print_options *options)
 736 {
 737   error (_("internal error - unimplemented "
 738            "function unk_lang_printstr called."));
 739 }
 740
 741 static void
 742 unk_lang_print_type (struct type *type, const char *varstring,
 743                      struct ui_file *stream, int show, int level,
 744                      const struct type_print_options *flags)
 745 {
 746   error (_("internal error - unimplemented "
 747            "function unk_lang_print_type called."));
 748 }
 749
 750 static void
 751 unk_lang_val_print (struct type *type,
 752                     int embedded_offset, CORE_ADDR address,
 753                     struct ui_file *stream, int recurse,
 754                     struct value *val,
 755                     const struct value_print_options *options)
 756 {
 757   error (_("internal error - unimplemented "
 758            "function unk_lang_val_print called."));
 759 }
 760
 761 static void
 762 unk_lang_value_print (struct value *val, struct ui_file *stream,
 763                       const struct value_print_options *options)
 764 {
 765   error (_("internal error - unimplemented "
 766            "function unk_lang_value_print called."));
 767 }
 768
 769 static CORE_ADDR unk_lang_trampoline (struct frame_info *frame, CORE_ADDR pc)
 770 {
 771   return 0;
 772 }
 773
 774 /* Unknown languages just use the cplus demangler.  */
 775 static char *unk_lang_demangle (const char *mangled, int options)
 776 {
 777   return gdb_demangle (mangled, options);
 778 }
 779
 780 static char *unk_lang_class_name (const char *mangled)
 781 {
 782   return NULL;
 783 }
 784
 785 static const struct op_print unk_op_print_tab[] =
 786 {
 787   {NULL, OP_NULL, PREC_NULL, 0}
 788 };
 789
 790 static void
 791 unknown_language_arch_info (struct gdbarch *gdbarch,
 792                             struct language_arch_info *lai)
 793 {
 794   lai->string_char_type = builtin_type (gdbarch)->builtin_char;
 795   lai->bool_type_default = builtin_type (gdbarch)->builtin_int;
 796   lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, 1,
 797                                                        struct type *);
 798 }
 799
 800 const struct language_defn unknown_language_defn =
 801 {
 802   "unknown",
 803   "Unknown",
 804   language_unknown,
 805   range_check_off,
 806   case_sensitive_on,
 807   array_row_major,
 808   macro_expansion_no,
 809   NULL,
 810   &exp_descriptor_standard,
 811   unk_lang_parser,
 812   unk_lang_error,
 813   null_post_parser,
 814   unk_lang_printchar,           /* Print character constant */
 815   unk_lang_printstr,
 816   unk_lang_emit_char,
 817   unk_lang_print_type,          /* Print a type using appropriate syntax */
 818   default_print_typedef,        /* Print a typedef using appropriate syntax */
 819   unk_lang_val_print,           /* Print a value using appropriate syntax */
 820   unk_lang_value_print,         /* Print a top-level value */
 821   default_read_var_value,       /* la_read_var_value */
 822   unk_lang_trampoline,          /* Language specific skip_trampoline */
 823   "this",                       /* name_of_this */
 824   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 825   basic_lookup_transparent_type,/* lookup_transparent_type */
 826   unk_lang_demangle,            /* Language specific symbol demangler */
 827   NULL,
 828   unk_lang_class_name,          /* Language specific
 829                                    class_name_from_physname */
 830   unk_op_print_tab,             /* expression operators for printing */
 831   1,                            /* c-style arrays */
 832   0,                            /* String lower bound */
 833   default_word_break_characters,
 834   default_collect_symbol_completion_matches,
 835   unknown_language_arch_info,   /* la_language_arch_info.  */
 836   default_print_array_index,
 837   default_pass_by_reference,
 838   default_get_string,
 839   c_watch_location_expression,
 840   NULL,                         /* la_get_symbol_name_cmp */
 841   iterate_over_symbols,
 842   default_search_name_hash,
 843   &default_varobj_ops,
 844   NULL,
 845   NULL,
 846   LANG_MAGIC
 847 };
 848
 849 /* These two structs define fake entries for the "local" and "auto"
 850    options.  */
 851 const struct language_defn auto_language_defn =
 852 {
 853   "auto",
 854   "Auto",
 855   language_auto,
 856   range_check_off,
 857   case_sensitive_on,
 858   array_row_major,
 859   macro_expansion_no,
 860   NULL,
 861   &exp_descriptor_standard,
 862   unk_lang_parser,
 863   unk_lang_error,
 864   null_post_parser,
 865   unk_lang_printchar,           /* Print character constant */
 866   unk_lang_printstr,
 867   unk_lang_emit_char,
 868   unk_lang_print_type,          /* Print a type using appropriate syntax */
 869   default_print_typedef,        /* Print a typedef using appropriate syntax */
 870   unk_lang_val_print,           /* Print a value using appropriate syntax */
 871   unk_lang_value_print,         /* Print a top-level value */
 872   default_read_var_value,       /* la_read_var_value */
 873   unk_lang_trampoline,          /* Language specific skip_trampoline */
 874   "this",                       /* name_of_this */
 875   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 876   basic_lookup_transparent_type,/* lookup_transparent_type */
 877   unk_lang_demangle,            /* Language specific symbol demangler */
 878   NULL,
 879   unk_lang_class_name,          /* Language specific
 880                                    class_name_from_physname */
 881   unk_op_print_tab,             /* expression operators for printing */
 882   1,                            /* c-style arrays */
 883   0,                            /* String lower bound */
 884   default_word_break_characters,
 885   default_collect_symbol_completion_matches,
 886   unknown_language_arch_info,   /* la_language_arch_info.  */
 887   default_print_array_index,
 888   default_pass_by_reference,
 889   default_get_string,
 890   c_watch_location_expression,
 891   NULL,                         /* la_get_symbol_name_cmp */
 892   iterate_over_symbols,
 893   default_search_name_hash,
 894   &default_varobj_ops,
 895   NULL,
 896   NULL,
 897   LANG_MAGIC
 898 };
 899
 900 \f
 901 /* Per-architecture language information.  */
 902
 903 static struct gdbarch_data *language_gdbarch_data;
 904
 905 struct language_gdbarch
 906 {
 907   /* A vector of per-language per-architecture info.  Indexed by "enum
 908      language".  */
 909   struct language_arch_info arch_info[nr_languages];
 910 };
 911
 912 static void *
 913 language_gdbarch_post_init (struct gdbarch *gdbarch)
 914 {
 915   struct language_gdbarch *l;
 916
 917   l = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct language_gdbarch);
 918   for (const auto &lang : languages)
 919     if (lang != NULL && lang->la_language_arch_info != NULL)
 920       {
 921         lang->la_language_arch_info (gdbarch,
 922                                      l->arch_info + lang->la_language);
 923       }
 924
 925   return l;
 926 }
 927
 928 struct type *
 929 language_string_char_type (const struct language_defn *la,
 930                            struct gdbarch *gdbarch)
 931 {
 932   struct language_gdbarch *ld
 933     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 934
 935   return ld->arch_info[la->la_language].string_char_type;
 936 }
 937
 938 struct type *
 939 language_bool_type (const struct language_defn *la,
 940                     struct gdbarch *gdbarch)
 941 {
 942   struct language_gdbarch *ld
 943     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 944
 945   if (ld->arch_info[la->la_language].bool_type_symbol)
 946     {
 947       struct symbol *sym;
 948
 949       sym = lookup_symbol (ld->arch_info[la->la_language].bool_type_symbol,
 950                            NULL, VAR_DOMAIN, NULL).symbol;
 951       if (sym)
 952         {
 953           struct type *type = SYMBOL_TYPE (sym);
 954
 955           if (type && TYPE_CODE (type) == TYPE_CODE_BOOL)
 956             return type;
 957         }
 958     }
 959
 960   return ld->arch_info[la->la_language].bool_type_default;
 961 }
 962
 963 /* Helper function for primitive type lookup.  */
 964
 965 static struct type **
 966 language_lookup_primitive_type_1 (const struct language_arch_info *lai,
 967                                   const char *name)
 968 {
 969   struct type **p;
 970
 971   for (p = lai->primitive_type_vector; (*p) != NULL; p++)
 972     {
 973       if (strcmp (TYPE_NAME (*p), name) == 0)
 974         return p;
 975     }
 976   return NULL;
 977 }
 978
 979 /* See language.h.  */
 980
 981 struct type *
 982 language_lookup_primitive_type (const struct language_defn *la,
 983                                 struct gdbarch *gdbarch,
 984                                 const char *name)
 985 {
 986   struct language_gdbarch *ld =
 987     (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 988   struct type **typep;
 989
 990   typep = language_lookup_primitive_type_1 (&ld->arch_info[la->la_language],
 991                                             name);
 992   if (typep == NULL)
 993     return NULL;
 994   return *typep;
 995 }
 996
 997 /* Helper function for type lookup as a symbol.
 998    Create the symbol corresponding to type TYPE in language LANG.  */
 999
1000 static struct symbol *
1001 language_alloc_type_symbol (enum language lang, struct type *type)
1002 {
1003   struct symbol *symbol;
1004   struct gdbarch *gdbarch;
1005
1006   gdb_assert (!TYPE_OBJFILE_OWNED (type));
1007
1008   gdbarch = TYPE_OWNER (type).gdbarch;
1009   symbol = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct symbol);
1010
1011   symbol->ginfo.name = TYPE_NAME (type);
1012   symbol->ginfo.language = lang;
1013   symbol->owner.arch = gdbarch;
1014   SYMBOL_OBJFILE_OWNED (symbol) = 0;
1015   SYMBOL_TYPE (symbol) = type;
1016   SYMBOL_DOMAIN (symbol) = VAR_DOMAIN;
1017   SYMBOL_ACLASS_INDEX (symbol) = LOC_TYPEDEF;
1018
1019   return symbol;
1020 }
1021
1022 /* Initialize the primitive type symbols of language LD.
1023    The primitive type vector must have already been initialized.  */
1024
1025 static void
1026 language_init_primitive_type_symbols (struct language_arch_info *lai,
1027                                       const struct language_defn *la,
1028                                       struct gdbarch *gdbarch)
1029 {
1030   int n;
1031
1032   gdb_assert (lai->primitive_type_vector != NULL);
1033
1034   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1035     continue;
1036
1037   lai->primitive_type_symbols
1038     = GDBARCH_OBSTACK_CALLOC (gdbarch, n + 1, struct symbol *);
1039
1040   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1041     {
1042       lai->primitive_type_symbols[n]
1043         = language_alloc_type_symbol (la->la_language,
1044                                       lai->primitive_type_vector[n]);
1045     }
1046
1047   /* Note: The result of symbol lookup is normally a symbol *and* the block
1048      it was found in.  Builtin types don't live in blocks.  We *could* give
1049      them one, but there is no current need so to keep things simple symbol
1050      lookup is extended to allow for BLOCK_FOUND to be NULL.  */
1051 }
1052
1053 /* See language.h.  */
1054
1055 struct symbol *
1056 language_lookup_primitive_type_as_symbol (const struct language_defn *la,
1057                                           struct gdbarch *gdbarch,
1058                                           const char *name)
1059 {
1060   struct language_gdbarch *ld
1061     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1062   struct language_arch_info *lai = &ld->arch_info[la->la_language];
1063   struct type **typep;
1064   struct symbol *sym;
1065
1066   if (symbol_lookup_debug)
1067     {
1068       fprintf_unfiltered (gdb_stdlog,
1069                           "language_lookup_primitive_type_as_symbol"
1070                           " (%s, %s, %s)",
1071                           la->la_name, host_address_to_string (gdbarch), name);
1072     }
1073
1074   typep = language_lookup_primitive_type_1 (lai, name);
1075   if (typep == NULL)
1076     {
1077       if (symbol_lookup_debug)
1078         fprintf_unfiltered (gdb_stdlog, " = NULL\n");
1079       return NULL;
1080     }
1081
1082   /* The set of symbols is lazily initialized.  */
1083   if (lai->primitive_type_symbols == NULL)
1084     language_init_primitive_type_symbols (lai, la, gdbarch);
1085
1086   sym = lai->primitive_type_symbols[typep - lai->primitive_type_vector];
1087
1088   if (symbol_lookup_debug)
1089     fprintf_unfiltered (gdb_stdlog, " = %s\n", host_address_to_string (sym));
1090   return sym;
1091 }
1092
1093 /* Initialize the language routines.  */
1094
1095 void
1096 _initialize_language (void)
1097 {
1098   static const char *const type_or_range_names[]
1099     = { "on", "off", "warn", "auto", NULL };
1100
1101   static const char *const case_sensitive_names[]
1102     = { "on", "off", "auto", NULL };
1103
1104   language_gdbarch_data
1105     = gdbarch_data_register_post_init (language_gdbarch_post_init);
1106
1107   /* GDB commands for language specific stuff.  */
1108
1109   add_prefix_cmd ("check", no_class, set_check,
1110                   _("Set the status of the type/range checker."),
1111                   &setchecklist, "set check ", 0, &setlist);
1112   add_alias_cmd ("c", "check", no_class, 1, &setlist);
1113   add_alias_cmd ("ch", "check", no_class, 1, &setlist);
1114
1115   add_prefix_cmd ("check", no_class, show_check,
1116                   _("Show the status of the type/range checker."),
1117                   &showchecklist, "show check ", 0, &showlist);
1118   add_alias_cmd ("c", "check", no_class, 1, &showlist);
1119   add_alias_cmd ("ch", "check", no_class, 1, &showlist);
1120
1121   add_setshow_enum_cmd ("range", class_support, type_or_range_names,
1122                         &range,
1123                         _("Set range checking.  (on/warn/off/auto)"),
1124                         _("Show range checking.  (on/warn/off/auto)"),
1125                         NULL, set_range_command,
1126                         show_range_command,
1127                         &setchecklist, &showchecklist);
1128
1129   add_setshow_enum_cmd ("case-sensitive", class_support, case_sensitive_names,
1130                         &case_sensitive, _("\
1131 Set case sensitivity in name search.  (on/off/auto)"), _("\
1132 Show case sensitivity in name search.  (on/off/auto)"), _("\
1133 For Fortran the default is off; for other languages the default is on."),
1134                         set_case_command,
1135                         show_case_command,
1136                         &setlist, &showlist);
1137
1138   add_set_language_command ();
1139
1140   language = xstrdup ("auto");
1141   type = xstrdup ("auto");
1142   range = xstrdup ("auto");
1143   case_sensitive = xstrdup ("auto");
1144
1145   /* Have the above take effect.  */
1146   set_language (language_auto);
1147 }