gdb/language.c

   1 /* Multiple source language support for GDB.
   2
   3    Copyright (C) 1991-2019 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 int unk_lang_parser (struct parser_state *);
  50
  51 static void set_range_case (void);
  52
  53 static void unk_lang_emit_char (int c, struct type *type,
  54                                 struct ui_file *stream, int quoter);
  55
  56 static void unk_lang_printchar (int c, struct type *type,
  57                                 struct ui_file *stream);
  58
  59 static void unk_lang_value_print (struct value *, struct ui_file *,
  60                                   const struct value_print_options *);
  61
  62 static CORE_ADDR unk_lang_trampoline (struct frame_info *, CORE_ADDR pc);
  63
  64 /* Forward declaration */
  65 extern const struct language_defn unknown_language_defn;
  66
  67 /* The current (default at startup) state of type and range checking.
  68    (If the modes are set to "auto", though, these are changed based
  69    on the default language at startup, and then again based on the
  70    language of the first source file.  */
  71
  72 enum range_mode range_mode = range_mode_auto;
  73 enum range_check range_check = range_check_off;
  74 enum case_mode case_mode = case_mode_auto;
  75 enum case_sensitivity case_sensitivity = case_sensitive_on;
  76
  77 /* The current language and language_mode (see language.h).  */
  78
  79 const struct language_defn *current_language = &unknown_language_defn;
  80 enum language_mode language_mode = language_mode_auto;
  81
  82 /* The language that the user expects to be typing in (the language
  83    of main(), or the last language we notified them about, or C).  */
  84
  85 const struct language_defn *expected_language;
  86
  87 /* The list of supported languages.  Keep this in the same order as
  88    the 'enum language' values.  */
  89
  90 static const struct language_defn *languages[] = {
  91   &unknown_language_defn,
  92   &auto_language_defn,
  93   &c_language_defn,
  94   &objc_language_defn,
  95   &cplus_language_defn,
  96   &d_language_defn,
  97   &go_language_defn,
  98   &f_language_defn,
  99   &m2_language_defn,
 100   &asm_language_defn,
 101   &pascal_language_defn,
 102   &opencl_language_defn,
 103   &rust_language_defn,
 104   &minimal_language_defn,
 105   &ada_language_defn,
 106 };
 107
 108 /* The current values of the "set language/range/case-sensitive" enum
 109    commands.  */
 110 static const char *language;
 111 static const char *range;
 112 static const char *case_sensitive;
 113
 114 /* Warning issued when current_language and the language of the current
 115    frame do not match.  */
 116 char lang_frame_mismatch_warn[] =
 117 "Warning: the current language does not match this frame.";
 118 \f
 119 /* This page contains the functions corresponding to GDB commands
 120    and their helpers.  */
 121
 122 /* Show command.  Display a warning if the language set
 123    does not match the frame.  */
 124 static void
 125 show_language_command (struct ui_file *file, int from_tty,
 126                        struct cmd_list_element *c, const char *value)
 127 {
 128   enum language flang;          /* The language of the frame.  */
 129
 130   if (language_mode == language_mode_auto)
 131     fprintf_filtered (gdb_stdout,
 132                       _("The current source language is "
 133                         "\"auto; currently %s\".\n"),
 134                       current_language->la_name);
 135   else
 136     fprintf_filtered (gdb_stdout,
 137                       _("The current source language is \"%s\".\n"),
 138                       current_language->la_name);
 139
 140   if (has_stack_frames ())
 141     {
 142       struct frame_info *frame;
 143
 144       frame = get_selected_frame (NULL);
 145       flang = get_frame_language (frame);
 146       if (flang != language_unknown
 147           && language_mode == language_mode_manual
 148           && current_language->la_language != flang)
 149         printf_filtered ("%s\n", lang_frame_mismatch_warn);
 150     }
 151 }
 152
 153 /* Set command.  Change the current working language.  */
 154 static void
 155 set_language_command (const char *ignore,
 156                       int from_tty, struct cmd_list_element *c)
 157 {
 158   enum language flang = language_unknown;
 159
 160   /* "local" is a synonym of "auto".  */
 161   if (strcmp (language, "local") == 0)
 162     language = "auto";
 163
 164   /* Search the list of languages for a match.  */
 165   for (const auto &lang : languages)
 166     {
 167       if (strcmp (lang->la_name, language) == 0)
 168         {
 169           /* Found it!  Go into manual mode, and use this language.  */
 170           if (lang->la_language == language_auto)
 171             {
 172               /* Enter auto mode.  Set to the current frame's language, if
 173                  known, or fallback to the initial language.  */
 174               language_mode = language_mode_auto;
 175               try
 176                 {
 177                   struct frame_info *frame;
 178
 179                   frame = get_selected_frame (NULL);
 180                   flang = get_frame_language (frame);
 181                 }
 182               catch (const gdb_exception_error &ex)
 183                 {
 184                   flang = language_unknown;
 185                 }
 186
 187               if (flang != language_unknown)
 188                 set_language (flang);
 189               else
 190                 set_initial_language ();
 191               expected_language = current_language;
 192               return;
 193             }
 194           else
 195             {
 196               /* Enter manual mode.  Set the specified language.  */
 197               language_mode = language_mode_manual;
 198               current_language = lang;
 199               set_range_case ();
 200               expected_language = current_language;
 201               return;
 202             }
 203         }
 204     }
 205
 206   internal_error (__FILE__, __LINE__,
 207                   "Couldn't find language `%s' in known languages list.",
 208                   language);
 209 }
 210
 211 /* Show command.  Display a warning if the range setting does
 212    not match the current language.  */
 213 static void
 214 show_range_command (struct ui_file *file, int from_tty,
 215                     struct cmd_list_element *c, const char *value)
 216 {
 217   if (range_mode == range_mode_auto)
 218     {
 219       const char *tmp;
 220
 221       switch (range_check)
 222         {
 223         case range_check_on:
 224           tmp = "on";
 225           break;
 226         case range_check_off:
 227           tmp = "off";
 228           break;
 229         case range_check_warn:
 230           tmp = "warn";
 231           break;
 232         default:
 233           internal_error (__FILE__, __LINE__,
 234                           "Unrecognized range check setting.");
 235         }
 236
 237       fprintf_filtered (gdb_stdout,
 238                         _("Range checking is \"auto; currently %s\".\n"),
 239                         tmp);
 240     }
 241   else
 242     fprintf_filtered (gdb_stdout, _("Range checking is \"%s\".\n"),
 243                       value);
 244
 245   if (range_check != current_language->la_range_check)
 246     warning (_("the current range check setting "
 247                "does not match the language.\n"));
 248 }
 249
 250 /* Set command.  Change the setting for range checking.  */
 251 static void
 252 set_range_command (const char *ignore,
 253                    int from_tty, struct cmd_list_element *c)
 254 {
 255   if (strcmp (range, "on") == 0)
 256     {
 257       range_check = range_check_on;
 258       range_mode = range_mode_manual;
 259     }
 260   else if (strcmp (range, "warn") == 0)
 261     {
 262       range_check = range_check_warn;
 263       range_mode = range_mode_manual;
 264     }
 265   else if (strcmp (range, "off") == 0)
 266     {
 267       range_check = range_check_off;
 268       range_mode = range_mode_manual;
 269     }
 270   else if (strcmp (range, "auto") == 0)
 271     {
 272       range_mode = range_mode_auto;
 273       set_range_case ();
 274       return;
 275     }
 276   else
 277     {
 278       internal_error (__FILE__, __LINE__,
 279                       _("Unrecognized range check setting: \"%s\""), range);
 280     }
 281   if (range_check != current_language->la_range_check)
 282     warning (_("the current range check setting "
 283                "does not match the language.\n"));
 284 }
 285
 286 /* Show command.  Display a warning if the case sensitivity setting does
 287    not match the current language.  */
 288 static void
 289 show_case_command (struct ui_file *file, int from_tty,
 290                    struct cmd_list_element *c, const char *value)
 291 {
 292   if (case_mode == case_mode_auto)
 293     {
 294       const char *tmp = NULL;
 295
 296       switch (case_sensitivity)
 297         {
 298         case case_sensitive_on:
 299           tmp = "on";
 300           break;
 301         case case_sensitive_off:
 302           tmp = "off";
 303           break;
 304         default:
 305           internal_error (__FILE__, __LINE__,
 306                           "Unrecognized case-sensitive setting.");
 307         }
 308
 309       fprintf_filtered (gdb_stdout,
 310                         _("Case sensitivity in "
 311                           "name search is \"auto; currently %s\".\n"),
 312                         tmp);
 313     }
 314   else
 315     fprintf_filtered (gdb_stdout,
 316                       _("Case sensitivity in name search is \"%s\".\n"),
 317                       value);
 318
 319   if (case_sensitivity != current_language->la_case_sensitivity)
 320     warning (_("the current case sensitivity setting does not match "
 321                "the language.\n"));
 322 }
 323
 324 /* Set command.  Change the setting for case sensitivity.  */
 325
 326 static void
 327 set_case_command (const char *ignore, int from_tty, struct cmd_list_element *c)
 328 {
 329    if (strcmp (case_sensitive, "on") == 0)
 330      {
 331        case_sensitivity = case_sensitive_on;
 332        case_mode = case_mode_manual;
 333      }
 334    else if (strcmp (case_sensitive, "off") == 0)
 335      {
 336        case_sensitivity = case_sensitive_off;
 337        case_mode = case_mode_manual;
 338      }
 339    else if (strcmp (case_sensitive, "auto") == 0)
 340      {
 341        case_mode = case_mode_auto;
 342        set_range_case ();
 343        return;
 344      }
 345    else
 346      {
 347        internal_error (__FILE__, __LINE__,
 348                        "Unrecognized case-sensitive setting: \"%s\"",
 349                        case_sensitive);
 350      }
 351
 352    if (case_sensitivity != current_language->la_case_sensitivity)
 353      warning (_("the current case sensitivity setting does not match "
 354                 "the language.\n"));
 355 }
 356
 357 /* Set the status of range and type checking and case sensitivity based on
 358    the current modes and the current language.
 359    If SHOW is non-zero, then print out the current language,
 360    type and range checking status.  */
 361 static void
 362 set_range_case (void)
 363 {
 364   if (range_mode == range_mode_auto)
 365     range_check = current_language->la_range_check;
 366
 367   if (case_mode == case_mode_auto)
 368     case_sensitivity = current_language->la_case_sensitivity;
 369 }
 370
 371 /* Set current language to (enum language) LANG.  Returns previous
 372    language.  */
 373
 374 enum language
 375 set_language (enum language lang)
 376 {
 377   enum language prev_language;
 378
 379   prev_language = current_language->la_language;
 380   current_language = languages[lang];
 381   set_range_case ();
 382   return prev_language;
 383 }
 384 \f
 385
 386 /* Print out the current language settings: language, range and
 387    type checking.  If QUIETLY, print only what has changed.  */
 388
 389 void
 390 language_info (int quietly)
 391 {
 392   if (quietly && expected_language == current_language)
 393     return;
 394
 395   expected_language = current_language;
 396   printf_unfiltered (_("Current language:  %s\n"), language);
 397   show_language_command (NULL, 1, NULL, NULL);
 398
 399   if (!quietly)
 400     {
 401       printf_unfiltered (_("Range checking:    %s\n"), range);
 402       show_range_command (NULL, 1, NULL, NULL);
 403       printf_unfiltered (_("Case sensitivity:  %s\n"), case_sensitive);
 404       show_case_command (NULL, 1, NULL, NULL);
 405     }
 406 }
 407 \f
 408
 409 /* Returns non-zero if the value is a pointer type.  */
 410 int
 411 pointer_type (struct type *type)
 412 {
 413   return TYPE_CODE (type) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (type);
 414 }
 415
 416 \f
 417 /* This page contains functions that return info about
 418    (struct value) values used in GDB.  */
 419
 420 /* Returns non-zero if the value VAL represents a true value.  */
 421 int
 422 value_true (struct value *val)
 423 {
 424   /* It is possible that we should have some sort of error if a non-boolean
 425      value is used in this context.  Possibly dependent on some kind of
 426      "boolean-checking" option like range checking.  But it should probably
 427      not depend on the language except insofar as is necessary to identify
 428      a "boolean" value (i.e. in C using a float, pointer, etc., as a boolean
 429      should be an error, probably).  */
 430   return !value_logical_not (val);
 431 }
 432 \f
 433 /* This page contains functions for the printing out of
 434    error messages that occur during type- and range-
 435    checking.  */
 436
 437 /* This is called when a language fails a range-check.  The
 438    first argument should be a printf()-style format string, and the
 439    rest of the arguments should be its arguments.  If range_check is
 440    range_check_on, an error is printed;  if range_check_warn, a warning;
 441    otherwise just the message.  */
 442
 443 void
 444 range_error (const char *string,...)
 445 {
 446   va_list args;
 447
 448   va_start (args, string);
 449   switch (range_check)
 450     {
 451     case range_check_warn:
 452       vwarning (string, args);
 453       break;
 454     case range_check_on:
 455       verror (string, args);
 456       break;
 457     case range_check_off:
 458       /* FIXME: cagney/2002-01-30: Should this function print anything
 459          when range error is off?  */
 460       vfprintf_filtered (gdb_stderr, string, args);
 461       fprintf_filtered (gdb_stderr, "\n");
 462       break;
 463     default:
 464       internal_error (__FILE__, __LINE__, _("bad switch"));
 465     }
 466   va_end (args);
 467 }
 468 \f
 469
 470 /* This page contains miscellaneous functions.  */
 471
 472 /* Return the language enum for a given language string.  */
 473
 474 enum language
 475 language_enum (const char *str)
 476 {
 477   for (const auto &lang : languages)
 478     if (strcmp (lang->la_name, str) == 0)
 479       return lang->la_language;
 480
 481   if (strcmp (str, "local") == 0)
 482     return language_auto;
 483
 484   return language_unknown;
 485 }
 486
 487 /* Return the language struct for a given language enum.  */
 488
 489 const struct language_defn *
 490 language_def (enum language lang)
 491 {
 492   return languages[lang];
 493 }
 494
 495 /* Return the language as a string.  */
 496
 497 const char *
 498 language_str (enum language lang)
 499 {
 500   return languages[lang]->la_name;
 501 }
 502
 503 static void
 504 set_check (const char *ignore, int from_tty)
 505 {
 506   printf_unfiltered (
 507      "\"set check\" must be followed by the name of a check subcommand.\n");
 508   help_list (setchecklist, "set check ", all_commands, gdb_stdout);
 509 }
 510
 511 static void
 512 show_check (const char *ignore, int from_tty)
 513 {
 514   cmd_show_list (showchecklist, from_tty, "");
 515 }
 516 \f
 517
 518 /* Build and install the "set language LANG" command.  */
 519
 520 static void
 521 add_set_language_command ()
 522 {
 523   static const char **language_names;
 524
 525   /* Build the language names array, to be used as enumeration in the
 526      "set language" enum command.  +1 for "local" and +1 for NULL
 527      termination.  */
 528   language_names = new const char *[ARRAY_SIZE (languages) + 2];
 529
 530   /* Display "auto", "local" and "unknown" first, and then the rest,
 531      alpha sorted.  */
 532   const char **language_names_p = language_names;
 533   *language_names_p++ = auto_language_defn.la_name;
 534   *language_names_p++ = "local";
 535   *language_names_p++ = unknown_language_defn.la_name;
 536   const char **sort_begin = language_names_p;
 537   for (const auto &lang : languages)
 538     {
 539       /* Already handled above.  */
 540       if (lang->la_language == language_auto
 541           || lang->la_language == language_unknown)
 542         continue;
 543       *language_names_p++ = lang->la_name;
 544     }
 545   *language_names_p = NULL;
 546   std::sort (sort_begin, language_names_p, compare_cstrings);
 547
 548   /* Add the filename extensions.  */
 549   for (const auto &lang : languages)
 550     if (lang->la_filename_extensions != NULL)
 551       {
 552         for (size_t i = 0; lang->la_filename_extensions[i] != NULL; ++i)
 553           add_filename_language (lang->la_filename_extensions[i],
 554                                  lang->la_language);
 555       }
 556
 557   /* Build the "help set language" docs.  */
 558   string_file doc;
 559
 560   doc.printf (_("Set the current source language.\n"
 561                 "The currently understood settings are:\n\nlocal or "
 562                 "auto    Automatic setting based on source file\n"));
 563
 564   for (const auto &lang : languages)
 565     {
 566       /* Already dealt with these above.  */
 567       if (lang->la_language == language_unknown
 568           || lang->la_language == language_auto)
 569         continue;
 570
 571       /* FIXME: i18n: for now assume that the human-readable name is
 572          just a capitalization of the internal name.  */
 573       doc.printf ("%-16s Use the %c%s language\n",
 574                   lang->la_name,
 575                   /* Capitalize first letter of language name.  */
 576                   toupper (lang->la_name[0]),
 577                   lang->la_name + 1);
 578     }
 579
 580   add_setshow_enum_cmd ("language", class_support,
 581                         language_names,
 582                         &language,
 583                         doc.c_str (),
 584                         _("Show the current source language."),
 585                         NULL, set_language_command,
 586                         show_language_command,
 587                         &setlist, &showlist);
 588 }
 589
 590 /* Iterate through all registered languages looking for and calling
 591    any non-NULL struct language_defn.skip_trampoline() functions.
 592    Return the result from the first that returns non-zero, or 0 if all
 593    `fail'.  */
 594 CORE_ADDR
 595 skip_language_trampoline (struct frame_info *frame, CORE_ADDR pc)
 596 {
 597   for (const auto &lang : languages)
 598     {
 599       if (lang->skip_trampoline != NULL)
 600         {
 601           CORE_ADDR real_pc = lang->skip_trampoline (frame, pc);
 602
 603           if (real_pc)
 604             return real_pc;
 605         }
 606     }
 607
 608   return 0;
 609 }
 610
 611 /* Return demangled language symbol, or NULL.
 612    FIXME: Options are only useful for certain languages and ignored
 613    by others, so it would be better to remove them here and have a
 614    more flexible demangler for the languages that need it.
 615    FIXME: Sometimes the demangler is invoked when we don't know the
 616    language, so we can't use this everywhere.  */
 617 char *
 618 language_demangle (const struct language_defn *current_language,
 619                                 const char *mangled, int options)
 620 {
 621   if (current_language != NULL && current_language->la_demangle)
 622     return current_language->la_demangle (mangled, options);
 623   return NULL;
 624 }
 625
 626 /* See langauge.h.  */
 627
 628 int
 629 language_sniff_from_mangled_name (const struct language_defn *lang,
 630                                   const char *mangled, char **demangled)
 631 {
 632   gdb_assert (lang != NULL);
 633
 634   if (lang->la_sniff_from_mangled_name == NULL)
 635     {
 636       *demangled = NULL;
 637       return 0;
 638     }
 639
 640   return lang->la_sniff_from_mangled_name (mangled, demangled);
 641 }
 642
 643 /* Return class name from physname or NULL.  */
 644 char *
 645 language_class_name_from_physname (const struct language_defn *lang,
 646                                    const char *physname)
 647 {
 648   if (lang != NULL && lang->la_class_name_from_physname)
 649     return lang->la_class_name_from_physname (physname);
 650   return NULL;
 651 }
 652
 653 /* Return non-zero if TYPE should be passed (and returned) by
 654    reference at the language level.  */
 655 int
 656 language_pass_by_reference (struct type *type)
 657 {
 658   return current_language->la_pass_by_reference (type);
 659 }
 660
 661 /* Return zero; by default, types are passed by value at the language
 662    level.  The target ABI may pass or return some structs by reference
 663    independent of this.  */
 664 int
 665 default_pass_by_reference (struct type *type)
 666 {
 667   return 0;
 668 }
 669
 670 /* Return the default string containing the list of characters
 671    delimiting words.  This is a reasonable default value that
 672    most languages should be able to use.  */
 673
 674 const char *
 675 default_word_break_characters (void)
 676 {
 677   return " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-";
 678 }
 679
 680 /* Print the index of array elements using the C99 syntax.  */
 681
 682 void
 683 default_print_array_index (struct value *index_value, struct ui_file *stream,
 684                            const struct value_print_options *options)
 685 {
 686   fprintf_filtered (stream, "[");
 687   LA_VALUE_PRINT (index_value, stream, options);
 688   fprintf_filtered (stream, "] = ");
 689 }
 690
 691 void
 692 default_get_string (struct value *value,
 693                     gdb::unique_xmalloc_ptr<gdb_byte> *buffer,
 694                     int *length, struct type **char_type, const char **charset)
 695 {
 696   error (_("Getting a string is unsupported in this language."));
 697 }
 698
 699 /* See language.h.  */
 700
 701 bool
 702 default_symbol_name_matcher (const char *symbol_search_name,
 703                              const lookup_name_info &lookup_name,
 704                              completion_match_result *comp_match_res)
 705 {
 706   const std::string &name = lookup_name.name ();
 707   completion_match_for_lcd *match_for_lcd
 708     = (comp_match_res != NULL ? &comp_match_res->match_for_lcd : NULL);
 709   strncmp_iw_mode mode = (lookup_name.completion_mode ()
 710                           ? strncmp_iw_mode::NORMAL
 711                           : strncmp_iw_mode::MATCH_PARAMS);
 712
 713   if (strncmp_iw_with_mode (symbol_search_name, name.c_str (), name.size (),
 714                             mode, language_minimal, match_for_lcd) == 0)
 715     {
 716       if (comp_match_res != NULL)
 717         comp_match_res->set_match (symbol_search_name);
 718       return true;
 719     }
 720   else
 721     return false;
 722 }
 723
 724 /* See language.h.  */
 725
 726 symbol_name_matcher_ftype *
 727 get_symbol_name_matcher (const language_defn *lang,
 728                          const lookup_name_info &lookup_name)
 729 {
 730   /* If currently in Ada mode, and the lookup name is wrapped in
 731      '<...>', hijack all symbol name comparisons using the Ada
 732      matcher, which handles the verbatim matching.  */
 733   if (current_language->la_language == language_ada
 734       && lookup_name.ada ().verbatim_p ())
 735     return current_language->la_get_symbol_name_matcher (lookup_name);
 736
 737   if (lang->la_get_symbol_name_matcher != nullptr)
 738     return lang->la_get_symbol_name_matcher (lookup_name);
 739   return default_symbol_name_matcher;
 740 }
 741
 742 /* Define the language that is no language.  */
 743
 744 static int
 745 unk_lang_parser (struct parser_state *ps)
 746 {
 747   return 1;
 748 }
 749
 750 static void
 751 unk_lang_emit_char (int c, struct type *type, struct ui_file *stream,
 752                     int quoter)
 753 {
 754   error (_("internal error - unimplemented "
 755            "function unk_lang_emit_char called."));
 756 }
 757
 758 static void
 759 unk_lang_printchar (int c, struct type *type, struct ui_file *stream)
 760 {
 761   error (_("internal error - unimplemented "
 762            "function unk_lang_printchar called."));
 763 }
 764
 765 static void
 766 unk_lang_printstr (struct ui_file *stream, struct type *type,
 767                    const gdb_byte *string, unsigned int length,
 768                    const char *encoding, int force_ellipses,
 769                    const struct value_print_options *options)
 770 {
 771   error (_("internal error - unimplemented "
 772            "function unk_lang_printstr called."));
 773 }
 774
 775 static void
 776 unk_lang_print_type (struct type *type, const char *varstring,
 777                      struct ui_file *stream, int show, int level,
 778                      const struct type_print_options *flags)
 779 {
 780   error (_("internal error - unimplemented "
 781            "function unk_lang_print_type called."));
 782 }
 783
 784 static void
 785 unk_lang_val_print (struct type *type,
 786                     int embedded_offset, CORE_ADDR address,
 787                     struct ui_file *stream, int recurse,
 788                     struct value *val,
 789                     const struct value_print_options *options)
 790 {
 791   error (_("internal error - unimplemented "
 792            "function unk_lang_val_print called."));
 793 }
 794
 795 static void
 796 unk_lang_value_print (struct value *val, struct ui_file *stream,
 797                       const struct value_print_options *options)
 798 {
 799   error (_("internal error - unimplemented "
 800            "function unk_lang_value_print called."));
 801 }
 802
 803 static CORE_ADDR unk_lang_trampoline (struct frame_info *frame, CORE_ADDR pc)
 804 {
 805   return 0;
 806 }
 807
 808 /* Unknown languages just use the cplus demangler.  */
 809 static char *unk_lang_demangle (const char *mangled, int options)
 810 {
 811   return gdb_demangle (mangled, options);
 812 }
 813
 814 static char *unk_lang_class_name (const char *mangled)
 815 {
 816   return NULL;
 817 }
 818
 819 static const struct op_print unk_op_print_tab[] =
 820 {
 821   {NULL, OP_NULL, PREC_NULL, 0}
 822 };
 823
 824 static void
 825 unknown_language_arch_info (struct gdbarch *gdbarch,
 826                             struct language_arch_info *lai)
 827 {
 828   lai->string_char_type = builtin_type (gdbarch)->builtin_char;
 829   lai->bool_type_default = builtin_type (gdbarch)->builtin_int;
 830   lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, 1,
 831                                                        struct type *);
 832 }
 833
 834 const struct language_defn unknown_language_defn =
 835 {
 836   "unknown",
 837   "Unknown",
 838   language_unknown,
 839   range_check_off,
 840   case_sensitive_on,
 841   array_row_major,
 842   macro_expansion_no,
 843   NULL,
 844   &exp_descriptor_standard,
 845   unk_lang_parser,
 846   null_post_parser,
 847   unk_lang_printchar,           /* Print character constant */
 848   unk_lang_printstr,
 849   unk_lang_emit_char,
 850   unk_lang_print_type,          /* Print a type using appropriate syntax */
 851   default_print_typedef,        /* Print a typedef using appropriate syntax */
 852   unk_lang_val_print,           /* Print a value using appropriate syntax */
 853   unk_lang_value_print,         /* Print a top-level value */
 854   default_read_var_value,       /* la_read_var_value */
 855   unk_lang_trampoline,          /* Language specific skip_trampoline */
 856   "this",                       /* name_of_this */
 857   true,                         /* store_sym_names_in_linkage_form_p */
 858   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 859   basic_lookup_transparent_type,/* lookup_transparent_type */
 860   unk_lang_demangle,            /* Language specific symbol demangler */
 861   NULL,
 862   unk_lang_class_name,          /* Language specific
 863                                    class_name_from_physname */
 864   unk_op_print_tab,             /* expression operators for printing */
 865   1,                            /* c-style arrays */
 866   0,                            /* String lower bound */
 867   default_word_break_characters,
 868   default_collect_symbol_completion_matches,
 869   unknown_language_arch_info,   /* la_language_arch_info.  */
 870   default_print_array_index,
 871   default_pass_by_reference,
 872   default_get_string,
 873   c_watch_location_expression,
 874   NULL,                         /* la_get_symbol_name_matcher */
 875   iterate_over_symbols,
 876   default_search_name_hash,
 877   &default_varobj_ops,
 878   NULL,
 879   NULL,
 880   LANG_MAGIC
 881 };
 882
 883 /* These two structs define fake entries for the "local" and "auto"
 884    options.  */
 885 const struct language_defn auto_language_defn =
 886 {
 887   "auto",
 888   "Auto",
 889   language_auto,
 890   range_check_off,
 891   case_sensitive_on,
 892   array_row_major,
 893   macro_expansion_no,
 894   NULL,
 895   &exp_descriptor_standard,
 896   unk_lang_parser,
 897   null_post_parser,
 898   unk_lang_printchar,           /* Print character constant */
 899   unk_lang_printstr,
 900   unk_lang_emit_char,
 901   unk_lang_print_type,          /* Print a type using appropriate syntax */
 902   default_print_typedef,        /* Print a typedef using appropriate syntax */
 903   unk_lang_val_print,           /* Print a value using appropriate syntax */
 904   unk_lang_value_print,         /* Print a top-level value */
 905   default_read_var_value,       /* la_read_var_value */
 906   unk_lang_trampoline,          /* Language specific skip_trampoline */
 907   "this",                       /* name_of_this */
 908   false,                        /* store_sym_names_in_linkage_form_p */
 909   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 910   basic_lookup_transparent_type,/* lookup_transparent_type */
 911   unk_lang_demangle,            /* Language specific symbol demangler */
 912   NULL,
 913   unk_lang_class_name,          /* Language specific
 914                                    class_name_from_physname */
 915   unk_op_print_tab,             /* expression operators for printing */
 916   1,                            /* c-style arrays */
 917   0,                            /* String lower bound */
 918   default_word_break_characters,
 919   default_collect_symbol_completion_matches,
 920   unknown_language_arch_info,   /* la_language_arch_info.  */
 921   default_print_array_index,
 922   default_pass_by_reference,
 923   default_get_string,
 924   c_watch_location_expression,
 925   NULL,                         /* la_get_symbol_name_matcher */
 926   iterate_over_symbols,
 927   default_search_name_hash,
 928   &default_varobj_ops,
 929   NULL,
 930   NULL,
 931   LANG_MAGIC
 932 };
 933
 934 \f
 935 /* Per-architecture language information.  */
 936
 937 static struct gdbarch_data *language_gdbarch_data;
 938
 939 struct language_gdbarch
 940 {
 941   /* A vector of per-language per-architecture info.  Indexed by "enum
 942      language".  */
 943   struct language_arch_info arch_info[nr_languages];
 944 };
 945
 946 static void *
 947 language_gdbarch_post_init (struct gdbarch *gdbarch)
 948 {
 949   struct language_gdbarch *l;
 950
 951   l = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct language_gdbarch);
 952   for (const auto &lang : languages)
 953     if (lang != NULL && lang->la_language_arch_info != NULL)
 954       {
 955         lang->la_language_arch_info (gdbarch,
 956                                      l->arch_info + lang->la_language);
 957       }
 958
 959   return l;
 960 }
 961
 962 struct type *
 963 language_string_char_type (const struct language_defn *la,
 964                            struct gdbarch *gdbarch)
 965 {
 966   struct language_gdbarch *ld
 967     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 968
 969   return ld->arch_info[la->la_language].string_char_type;
 970 }
 971
 972 struct type *
 973 language_bool_type (const struct language_defn *la,
 974                     struct gdbarch *gdbarch)
 975 {
 976   struct language_gdbarch *ld
 977     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 978
 979   if (ld->arch_info[la->la_language].bool_type_symbol)
 980     {
 981       struct symbol *sym;
 982
 983       sym = lookup_symbol (ld->arch_info[la->la_language].bool_type_symbol,
 984                            NULL, VAR_DOMAIN, NULL).symbol;
 985       if (sym)
 986         {
 987           struct type *type = SYMBOL_TYPE (sym);
 988
 989           if (type && TYPE_CODE (type) == TYPE_CODE_BOOL)
 990             return type;
 991         }
 992     }
 993
 994   return ld->arch_info[la->la_language].bool_type_default;
 995 }
 996
 997 /* Helper function for primitive type lookup.  */
 998
 999 static struct type **
1000 language_lookup_primitive_type_1 (const struct language_arch_info *lai,
1001                                   const char *name)
1002 {
1003   struct type **p;
1004
1005   for (p = lai->primitive_type_vector; (*p) != NULL; p++)
1006     {
1007       if (strcmp (TYPE_NAME (*p), name) == 0)
1008         return p;
1009     }
1010   return NULL;
1011 }
1012
1013 /* See language.h.  */
1014
1015 struct type *
1016 language_lookup_primitive_type (const struct language_defn *la,
1017                                 struct gdbarch *gdbarch,
1018                                 const char *name)
1019 {
1020   struct language_gdbarch *ld =
1021     (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1022   struct type **typep;
1023
1024   typep = language_lookup_primitive_type_1 (&ld->arch_info[la->la_language],
1025                                             name);
1026   if (typep == NULL)
1027     return NULL;
1028   return *typep;
1029 }
1030
1031 /* Helper function for type lookup as a symbol.
1032    Create the symbol corresponding to type TYPE in language LANG.  */
1033
1034 static struct symbol *
1035 language_alloc_type_symbol (enum language lang, struct type *type)
1036 {
1037   struct symbol *symbol;
1038   struct gdbarch *gdbarch;
1039
1040   gdb_assert (!TYPE_OBJFILE_OWNED (type));
1041
1042   gdbarch = TYPE_OWNER (type).gdbarch;
1043   symbol = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct symbol);
1044
1045   symbol->ginfo.name = TYPE_NAME (type);
1046   symbol->ginfo.language = lang;
1047   symbol->owner.arch = gdbarch;
1048   SYMBOL_OBJFILE_OWNED (symbol) = 0;
1049   SYMBOL_TYPE (symbol) = type;
1050   SYMBOL_DOMAIN (symbol) = VAR_DOMAIN;
1051   SYMBOL_ACLASS_INDEX (symbol) = LOC_TYPEDEF;
1052
1053   return symbol;
1054 }
1055
1056 /* Initialize the primitive type symbols of language LD.
1057    The primitive type vector must have already been initialized.  */
1058
1059 static void
1060 language_init_primitive_type_symbols (struct language_arch_info *lai,
1061                                       const struct language_defn *la,
1062                                       struct gdbarch *gdbarch)
1063 {
1064   int n;
1065
1066   gdb_assert (lai->primitive_type_vector != NULL);
1067
1068   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1069     continue;
1070
1071   lai->primitive_type_symbols
1072     = GDBARCH_OBSTACK_CALLOC (gdbarch, n + 1, struct symbol *);
1073
1074   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1075     {
1076       lai->primitive_type_symbols[n]
1077         = language_alloc_type_symbol (la->la_language,
1078                                       lai->primitive_type_vector[n]);
1079     }
1080
1081   /* Note: The result of symbol lookup is normally a symbol *and* the block
1082      it was found in.  Builtin types don't live in blocks.  We *could* give
1083      them one, but there is no current need so to keep things simple symbol
1084      lookup is extended to allow for BLOCK_FOUND to be NULL.  */
1085 }
1086
1087 /* See language.h.  */
1088
1089 struct symbol *
1090 language_lookup_primitive_type_as_symbol (const struct language_defn *la,
1091                                           struct gdbarch *gdbarch,
1092                                           const char *name)
1093 {
1094   struct language_gdbarch *ld
1095     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1096   struct language_arch_info *lai = &ld->arch_info[la->la_language];
1097   struct type **typep;
1098   struct symbol *sym;
1099
1100   if (symbol_lookup_debug)
1101     {
1102       fprintf_unfiltered (gdb_stdlog,
1103                           "language_lookup_primitive_type_as_symbol"
1104                           " (%s, %s, %s)",
1105                           la->la_name, host_address_to_string (gdbarch), name);
1106     }
1107
1108   typep = language_lookup_primitive_type_1 (lai, name);
1109   if (typep == NULL)
1110     {
1111       if (symbol_lookup_debug)
1112         fprintf_unfiltered (gdb_stdlog, " = NULL\n");
1113       return NULL;
1114     }
1115
1116   /* The set of symbols is lazily initialized.  */
1117   if (lai->primitive_type_symbols == NULL)
1118     language_init_primitive_type_symbols (lai, la, gdbarch);
1119
1120   sym = lai->primitive_type_symbols[typep - lai->primitive_type_vector];
1121
1122   if (symbol_lookup_debug)
1123     fprintf_unfiltered (gdb_stdlog, " = %s\n", host_address_to_string (sym));
1124   return sym;
1125 }
1126
1127 /* Initialize the language routines.  */
1128
1129 void
1130 _initialize_language (void)
1131 {
1132   static const char *const type_or_range_names[]
1133     = { "on", "off", "warn", "auto", NULL };
1134
1135   static const char *const case_sensitive_names[]
1136     = { "on", "off", "auto", NULL };
1137
1138   language_gdbarch_data
1139     = gdbarch_data_register_post_init (language_gdbarch_post_init);
1140
1141   /* GDB commands for language specific stuff.  */
1142
1143   add_prefix_cmd ("check", no_class, set_check,
1144                   _("Set the status of the type/range checker."),
1145                   &setchecklist, "set check ", 0, &setlist);
1146   add_alias_cmd ("c", "check", no_class, 1, &setlist);
1147   add_alias_cmd ("ch", "check", no_class, 1, &setlist);
1148
1149   add_prefix_cmd ("check", no_class, show_check,
1150                   _("Show the status of the type/range checker."),
1151                   &showchecklist, "show check ", 0, &showlist);
1152   add_alias_cmd ("c", "check", no_class, 1, &showlist);
1153   add_alias_cmd ("ch", "check", no_class, 1, &showlist);
1154
1155   add_setshow_enum_cmd ("range", class_support, type_or_range_names,
1156                         &range,
1157                         _("Set range checking.  (on/warn/off/auto)"),
1158                         _("Show range checking.  (on/warn/off/auto)"),
1159                         NULL, set_range_command,
1160                         show_range_command,
1161                         &setchecklist, &showchecklist);
1162
1163   add_setshow_enum_cmd ("case-sensitive", class_support, case_sensitive_names,
1164                         &case_sensitive, _("\
1165 Set case sensitivity in name search.  (on/off/auto)"), _("\
1166 Show case sensitivity in name search.  (on/off/auto)"), _("\
1167 For Fortran the default is off; for other languages the default is on."),
1168                         set_case_command,
1169                         show_case_command,
1170                         &setlist, &showlist);
1171
1172   add_set_language_command ();
1173
1174   language = "auto";
1175   range = "auto";
1176   case_sensitive = "auto";
1177
1178   /* Have the above take effect.  */
1179   set_language (language_auto);
1180 }