gdb/language.c

   1 /* Multiple source language support for GDB.
   2
   3    Copyright (C) 1991-2020 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 #include "gdbarch.h"
  49
  50 static int unk_lang_parser (struct parser_state *);
  51
  52 static void set_range_case (void);
  53
  54 static void unk_lang_emit_char (int c, struct type *type,
  55                                 struct ui_file *stream, int quoter);
  56
  57 static void unk_lang_printchar (int c, struct type *type,
  58                                 struct ui_file *stream);
  59
  60 static void unk_lang_value_print (struct value *, struct ui_file *,
  61                                   const struct value_print_options *);
  62
  63 static CORE_ADDR unk_lang_trampoline (struct frame_info *, CORE_ADDR pc);
  64
  65 /* Forward declaration */
  66 extern const struct language_defn unknown_language_defn;
  67
  68 /* The current (default at startup) state of type and range checking.
  69    (If the modes are set to "auto", though, these are changed based
  70    on the default language at startup, and then again based on the
  71    language of the first source file.  */
  72
  73 enum range_mode range_mode = range_mode_auto;
  74 enum range_check range_check = range_check_off;
  75 enum case_mode case_mode = case_mode_auto;
  76 enum case_sensitivity case_sensitivity = case_sensitive_on;
  77
  78 /* The current language and language_mode (see language.h).  */
  79
  80 const struct language_defn *current_language = &unknown_language_defn;
  81 enum language_mode language_mode = language_mode_auto;
  82
  83 /* The language that the user expects to be typing in (the language
  84    of main(), or the last language we notified them about, or C).  */
  85
  86 const struct language_defn *expected_language;
  87
  88 /* The list of supported languages.  Keep this in the same order as
  89    the 'enum language' values.  */
  90
  91 static const struct language_defn *languages[] = {
  92   &unknown_language_defn,
  93   &auto_language_defn,
  94   &c_language_defn,
  95   &objc_language_defn,
  96   &cplus_language_defn,
  97   &d_language_defn,
  98   &go_language_defn,
  99   &f_language_defn,
 100   &m2_language_defn,
 101   &asm_language_defn,
 102   &pascal_language_defn,
 103   &opencl_language_defn,
 104   &rust_language_defn,
 105   &minimal_language_defn,
 106   &ada_language_defn,
 107 };
 108
 109 /* The current values of the "set language/range/case-sensitive" enum
 110    commands.  */
 111 static const char *language;
 112 static const char *range;
 113 static const char *case_sensitive;
 114
 115 /* See language.h.  */
 116 const char lang_frame_mismatch_warn[] =
 117 N_("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"));
 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       /* Note that we add the newline at the front, so we don't wind
 574          up with a trailing newline.  */
 575       doc.printf ("\n%-16s Use the %c%s language",
 576                   lang->la_name,
 577                   /* Capitalize first letter of language name.  */
 578                   toupper (lang->la_name[0]),
 579                   lang->la_name + 1);
 580     }
 581
 582   add_setshow_enum_cmd ("language", class_support,
 583                         language_names,
 584                         &language,
 585                         doc.c_str (),
 586                         _("Show the current source language."),
 587                         NULL, set_language_command,
 588                         show_language_command,
 589                         &setlist, &showlist);
 590 }
 591
 592 /* Iterate through all registered languages looking for and calling
 593    any non-NULL struct language_defn.skip_trampoline() functions.
 594    Return the result from the first that returns non-zero, or 0 if all
 595    `fail'.  */
 596 CORE_ADDR
 597 skip_language_trampoline (struct frame_info *frame, CORE_ADDR pc)
 598 {
 599   for (const auto &lang : languages)
 600     {
 601       if (lang->skip_trampoline != NULL)
 602         {
 603           CORE_ADDR real_pc = lang->skip_trampoline (frame, pc);
 604
 605           if (real_pc)
 606             return real_pc;
 607         }
 608     }
 609
 610   return 0;
 611 }
 612
 613 /* Return demangled language symbol, or NULL.
 614    FIXME: Options are only useful for certain languages and ignored
 615    by others, so it would be better to remove them here and have a
 616    more flexible demangler for the languages that need it.
 617    FIXME: Sometimes the demangler is invoked when we don't know the
 618    language, so we can't use this everywhere.  */
 619 char *
 620 language_demangle (const struct language_defn *current_language,
 621                                 const char *mangled, int options)
 622 {
 623   if (current_language != NULL && current_language->la_demangle)
 624     return current_language->la_demangle (mangled, options);
 625   return NULL;
 626 }
 627
 628 /* See language.h.  */
 629
 630 int
 631 language_sniff_from_mangled_name (const struct language_defn *lang,
 632                                   const char *mangled, char **demangled)
 633 {
 634   gdb_assert (lang != NULL);
 635
 636   if (lang->la_sniff_from_mangled_name == NULL)
 637     {
 638       *demangled = NULL;
 639       return 0;
 640     }
 641
 642   return lang->la_sniff_from_mangled_name (mangled, demangled);
 643 }
 644
 645 /* Return class name from physname or NULL.  */
 646 char *
 647 language_class_name_from_physname (const struct language_defn *lang,
 648                                    const char *physname)
 649 {
 650   if (lang != NULL && lang->la_class_name_from_physname)
 651     return lang->la_class_name_from_physname (physname);
 652   return NULL;
 653 }
 654
 655 /* Return information about whether TYPE should be passed
 656    (and returned) by reference at the language level.  */
 657
 658 struct language_pass_by_ref_info
 659 language_pass_by_reference (struct type *type)
 660 {
 661   return current_language->la_pass_by_reference (type);
 662 }
 663
 664 /* Return a default struct that provides pass-by-reference information
 665    about the given TYPE.  Languages should update the default values
 666    as appropriate.  */
 667
 668 struct language_pass_by_ref_info
 669 default_pass_by_reference (struct type *type)
 670 {
 671   return {};
 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 /* See language.h.  */
 696
 697 bool
 698 default_symbol_name_matcher (const char *symbol_search_name,
 699                              const lookup_name_info &lookup_name,
 700                              completion_match_result *comp_match_res)
 701 {
 702   const std::string &name = lookup_name.name ();
 703   completion_match_for_lcd *match_for_lcd
 704     = (comp_match_res != NULL ? &comp_match_res->match_for_lcd : NULL);
 705   strncmp_iw_mode mode = (lookup_name.completion_mode ()
 706                           ? strncmp_iw_mode::NORMAL
 707                           : strncmp_iw_mode::MATCH_PARAMS);
 708
 709   if (strncmp_iw_with_mode (symbol_search_name, name.c_str (), name.size (),
 710                             mode, language_minimal, match_for_lcd) == 0)
 711     {
 712       if (comp_match_res != NULL)
 713         comp_match_res->set_match (symbol_search_name);
 714       return true;
 715     }
 716   else
 717     return false;
 718 }
 719
 720 /* See language.h.  */
 721
 722 bool
 723 default_is_string_type_p (struct type *type)
 724 {
 725   type = check_typedef (type);
 726   while (TYPE_CODE (type) == TYPE_CODE_REF)
 727     {
 728       type = TYPE_TARGET_TYPE (type);
 729       type = check_typedef (type);
 730     }
 731   return (TYPE_CODE (type)  == TYPE_CODE_STRING);
 732 }
 733
 734 /* See language.h.  */
 735
 736 symbol_name_matcher_ftype *
 737 get_symbol_name_matcher (const language_defn *lang,
 738                          const lookup_name_info &lookup_name)
 739 {
 740   /* If currently in Ada mode, and the lookup name is wrapped in
 741      '<...>', hijack all symbol name comparisons using the Ada
 742      matcher, which handles the verbatim matching.  */
 743   if (current_language->la_language == language_ada
 744       && lookup_name.ada ().verbatim_p ())
 745     return current_language->la_get_symbol_name_matcher (lookup_name);
 746
 747   if (lang->la_get_symbol_name_matcher != nullptr)
 748     return lang->la_get_symbol_name_matcher (lookup_name);
 749   return default_symbol_name_matcher;
 750 }
 751
 752 /* Define the language that is no language.  */
 753
 754 static int
 755 unk_lang_parser (struct parser_state *ps)
 756 {
 757   return 1;
 758 }
 759
 760 static void
 761 unk_lang_emit_char (int c, struct type *type, struct ui_file *stream,
 762                     int quoter)
 763 {
 764   error (_("internal error - unimplemented "
 765            "function unk_lang_emit_char called."));
 766 }
 767
 768 static void
 769 unk_lang_printchar (int c, struct type *type, struct ui_file *stream)
 770 {
 771   error (_("internal error - unimplemented "
 772            "function unk_lang_printchar called."));
 773 }
 774
 775 static void
 776 unk_lang_printstr (struct ui_file *stream, struct type *type,
 777                    const gdb_byte *string, unsigned int length,
 778                    const char *encoding, int force_ellipses,
 779                    const struct value_print_options *options)
 780 {
 781   error (_("internal error - unimplemented "
 782            "function unk_lang_printstr called."));
 783 }
 784
 785 static void
 786 unk_lang_print_type (struct type *type, const char *varstring,
 787                      struct ui_file *stream, int show, int level,
 788                      const struct type_print_options *flags)
 789 {
 790   error (_("internal error - unimplemented "
 791            "function unk_lang_print_type called."));
 792 }
 793
 794 static void
 795 unk_lang_val_print (struct type *type,
 796                     int embedded_offset, CORE_ADDR address,
 797                     struct ui_file *stream, int recurse,
 798                     struct value *val,
 799                     const struct value_print_options *options)
 800 {
 801   error (_("internal error - unimplemented "
 802            "function unk_lang_val_print called."));
 803 }
 804
 805 static void
 806 unk_lang_value_print (struct value *val, struct ui_file *stream,
 807                       const struct value_print_options *options)
 808 {
 809   error (_("internal error - unimplemented "
 810            "function unk_lang_value_print called."));
 811 }
 812
 813 static CORE_ADDR unk_lang_trampoline (struct frame_info *frame, CORE_ADDR pc)
 814 {
 815   return 0;
 816 }
 817
 818 /* Unknown languages just use the cplus demangler.  */
 819 static char *unk_lang_demangle (const char *mangled, int options)
 820 {
 821   return gdb_demangle (mangled, options);
 822 }
 823
 824 static char *unk_lang_class_name (const char *mangled)
 825 {
 826   return NULL;
 827 }
 828
 829 static const struct op_print unk_op_print_tab[] =
 830 {
 831   {NULL, OP_NULL, PREC_NULL, 0}
 832 };
 833
 834 static void
 835 unknown_language_arch_info (struct gdbarch *gdbarch,
 836                             struct language_arch_info *lai)
 837 {
 838   lai->string_char_type = builtin_type (gdbarch)->builtin_char;
 839   lai->bool_type_default = builtin_type (gdbarch)->builtin_int;
 840   lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, 1,
 841                                                        struct type *);
 842 }
 843
 844 const struct language_defn unknown_language_defn =
 845 {
 846   "unknown",
 847   "Unknown",
 848   language_unknown,
 849   range_check_off,
 850   case_sensitive_on,
 851   array_row_major,
 852   macro_expansion_no,
 853   NULL,
 854   &exp_descriptor_standard,
 855   unk_lang_parser,
 856   null_post_parser,
 857   unk_lang_printchar,           /* Print character constant */
 858   unk_lang_printstr,
 859   unk_lang_emit_char,
 860   unk_lang_print_type,          /* Print a type using appropriate syntax */
 861   default_print_typedef,        /* Print a typedef using appropriate syntax */
 862   unk_lang_val_print,           /* Print a value using appropriate syntax */
 863   unk_lang_value_print,         /* Print a top-level value */
 864   default_read_var_value,       /* la_read_var_value */
 865   unk_lang_trampoline,          /* Language specific skip_trampoline */
 866   "this",                       /* name_of_this */
 867   true,                         /* store_sym_names_in_linkage_form_p */
 868   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 869   basic_lookup_transparent_type,/* lookup_transparent_type */
 870   unk_lang_demangle,            /* Language specific symbol demangler */
 871   NULL,
 872   unk_lang_class_name,          /* Language specific
 873                                    class_name_from_physname */
 874   unk_op_print_tab,             /* expression operators for printing */
 875   1,                            /* c-style arrays */
 876   0,                            /* String lower bound */
 877   default_word_break_characters,
 878   default_collect_symbol_completion_matches,
 879   unknown_language_arch_info,   /* la_language_arch_info.  */
 880   default_print_array_index,
 881   default_pass_by_reference,
 882   c_watch_location_expression,
 883   NULL,                         /* la_get_symbol_name_matcher */
 884   iterate_over_symbols,
 885   default_search_name_hash,
 886   &default_varobj_ops,
 887   NULL,
 888   NULL,
 889   default_is_string_type_p,
 890   "{...}"                       /* la_struct_too_deep_ellipsis */
 891 };
 892
 893 /* These two structs define fake entries for the "local" and "auto"
 894    options.  */
 895 const struct language_defn auto_language_defn =
 896 {
 897   "auto",
 898   "Auto",
 899   language_auto,
 900   range_check_off,
 901   case_sensitive_on,
 902   array_row_major,
 903   macro_expansion_no,
 904   NULL,
 905   &exp_descriptor_standard,
 906   unk_lang_parser,
 907   null_post_parser,
 908   unk_lang_printchar,           /* Print character constant */
 909   unk_lang_printstr,
 910   unk_lang_emit_char,
 911   unk_lang_print_type,          /* Print a type using appropriate syntax */
 912   default_print_typedef,        /* Print a typedef using appropriate syntax */
 913   unk_lang_val_print,           /* Print a value using appropriate syntax */
 914   unk_lang_value_print,         /* Print a top-level value */
 915   default_read_var_value,       /* la_read_var_value */
 916   unk_lang_trampoline,          /* Language specific skip_trampoline */
 917   "this",                       /* name_of_this */
 918   false,                        /* store_sym_names_in_linkage_form_p */
 919   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 920   basic_lookup_transparent_type,/* lookup_transparent_type */
 921   unk_lang_demangle,            /* Language specific symbol demangler */
 922   NULL,
 923   unk_lang_class_name,          /* Language specific
 924                                    class_name_from_physname */
 925   unk_op_print_tab,             /* expression operators for printing */
 926   1,                            /* c-style arrays */
 927   0,                            /* String lower bound */
 928   default_word_break_characters,
 929   default_collect_symbol_completion_matches,
 930   unknown_language_arch_info,   /* la_language_arch_info.  */
 931   default_print_array_index,
 932   default_pass_by_reference,
 933   c_watch_location_expression,
 934   NULL,                         /* la_get_symbol_name_matcher */
 935   iterate_over_symbols,
 936   default_search_name_hash,
 937   &default_varobj_ops,
 938   NULL,
 939   NULL,
 940   default_is_string_type_p,
 941   "{...}"                       /* la_struct_too_deep_ellipsis */
 942 };
 943
 944 \f
 945 /* Per-architecture language information.  */
 946
 947 static struct gdbarch_data *language_gdbarch_data;
 948
 949 struct language_gdbarch
 950 {
 951   /* A vector of per-language per-architecture info.  Indexed by "enum
 952      language".  */
 953   struct language_arch_info arch_info[nr_languages];
 954 };
 955
 956 static void *
 957 language_gdbarch_post_init (struct gdbarch *gdbarch)
 958 {
 959   struct language_gdbarch *l;
 960
 961   l = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct language_gdbarch);
 962   for (const auto &lang : languages)
 963     if (lang != NULL && lang->la_language_arch_info != NULL)
 964       {
 965         lang->la_language_arch_info (gdbarch,
 966                                      l->arch_info + lang->la_language);
 967       }
 968
 969   return l;
 970 }
 971
 972 struct type *
 973 language_string_char_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   return ld->arch_info[la->la_language].string_char_type;
 980 }
 981
 982 struct type *
 983 language_bool_type (const struct language_defn *la,
 984                     struct gdbarch *gdbarch)
 985 {
 986   struct language_gdbarch *ld
 987     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 988
 989   if (ld->arch_info[la->la_language].bool_type_symbol)
 990     {
 991       struct symbol *sym;
 992
 993       sym = lookup_symbol (ld->arch_info[la->la_language].bool_type_symbol,
 994                            NULL, VAR_DOMAIN, NULL).symbol;
 995       if (sym)
 996         {
 997           struct type *type = SYMBOL_TYPE (sym);
 998
 999           if (type && TYPE_CODE (type) == TYPE_CODE_BOOL)
1000             return type;
1001         }
1002     }
1003
1004   return ld->arch_info[la->la_language].bool_type_default;
1005 }
1006
1007 /* Helper function for primitive type lookup.  */
1008
1009 static struct type **
1010 language_lookup_primitive_type_1 (const struct language_arch_info *lai,
1011                                   const char *name)
1012 {
1013   struct type **p;
1014
1015   for (p = lai->primitive_type_vector; (*p) != NULL; p++)
1016     {
1017       if (strcmp (TYPE_NAME (*p), name) == 0)
1018         return p;
1019     }
1020   return NULL;
1021 }
1022
1023 /* See language.h.  */
1024
1025 struct type *
1026 language_lookup_primitive_type (const struct language_defn *la,
1027                                 struct gdbarch *gdbarch,
1028                                 const char *name)
1029 {
1030   struct language_gdbarch *ld =
1031     (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1032   struct type **typep;
1033
1034   typep = language_lookup_primitive_type_1 (&ld->arch_info[la->la_language],
1035                                             name);
1036   if (typep == NULL)
1037     return NULL;
1038   return *typep;
1039 }
1040
1041 /* Helper function for type lookup as a symbol.
1042    Create the symbol corresponding to type TYPE in language LANG.  */
1043
1044 static struct symbol *
1045 language_alloc_type_symbol (enum language lang, struct type *type)
1046 {
1047   struct symbol *symbol;
1048   struct gdbarch *gdbarch;
1049
1050   gdb_assert (!TYPE_OBJFILE_OWNED (type));
1051
1052   gdbarch = TYPE_OWNER (type).gdbarch;
1053   symbol = new (gdbarch_obstack (gdbarch)) struct symbol ();
1054
1055   symbol->m_name = TYPE_NAME (type);
1056   symbol->set_language (lang, nullptr);
1057   symbol->owner.arch = gdbarch;
1058   SYMBOL_OBJFILE_OWNED (symbol) = 0;
1059   SYMBOL_TYPE (symbol) = type;
1060   SYMBOL_DOMAIN (symbol) = VAR_DOMAIN;
1061   SYMBOL_ACLASS_INDEX (symbol) = LOC_TYPEDEF;
1062
1063   return symbol;
1064 }
1065
1066 /* Initialize the primitive type symbols of language LD.
1067    The primitive type vector must have already been initialized.  */
1068
1069 static void
1070 language_init_primitive_type_symbols (struct language_arch_info *lai,
1071                                       const struct language_defn *la,
1072                                       struct gdbarch *gdbarch)
1073 {
1074   int n;
1075
1076   gdb_assert (lai->primitive_type_vector != NULL);
1077
1078   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1079     continue;
1080
1081   lai->primitive_type_symbols
1082     = GDBARCH_OBSTACK_CALLOC (gdbarch, n + 1, struct symbol *);
1083
1084   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1085     {
1086       lai->primitive_type_symbols[n]
1087         = language_alloc_type_symbol (la->la_language,
1088                                       lai->primitive_type_vector[n]);
1089     }
1090
1091   /* Note: The result of symbol lookup is normally a symbol *and* the block
1092      it was found in.  Builtin types don't live in blocks.  We *could* give
1093      them one, but there is no current need so to keep things simple symbol
1094      lookup is extended to allow for BLOCK_FOUND to be NULL.  */
1095 }
1096
1097 /* See language.h.  */
1098
1099 struct symbol *
1100 language_lookup_primitive_type_as_symbol (const struct language_defn *la,
1101                                           struct gdbarch *gdbarch,
1102                                           const char *name)
1103 {
1104   struct language_gdbarch *ld
1105     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1106   struct language_arch_info *lai = &ld->arch_info[la->la_language];
1107   struct type **typep;
1108   struct symbol *sym;
1109
1110   if (symbol_lookup_debug)
1111     {
1112       fprintf_unfiltered (gdb_stdlog,
1113                           "language_lookup_primitive_type_as_symbol"
1114                           " (%s, %s, %s)",
1115                           la->la_name, host_address_to_string (gdbarch), name);
1116     }
1117
1118   typep = language_lookup_primitive_type_1 (lai, name);
1119   if (typep == NULL)
1120     {
1121       if (symbol_lookup_debug)
1122         fprintf_unfiltered (gdb_stdlog, " = NULL\n");
1123       return NULL;
1124     }
1125
1126   /* The set of symbols is lazily initialized.  */
1127   if (lai->primitive_type_symbols == NULL)
1128     language_init_primitive_type_symbols (lai, la, gdbarch);
1129
1130   sym = lai->primitive_type_symbols[typep - lai->primitive_type_vector];
1131
1132   if (symbol_lookup_debug)
1133     fprintf_unfiltered (gdb_stdlog, " = %s\n", host_address_to_string (sym));
1134   return sym;
1135 }
1136
1137 /* Initialize the language routines.  */
1138
1139 void
1140 _initialize_language (void)
1141 {
1142   static const char *const type_or_range_names[]
1143     = { "on", "off", "warn", "auto", NULL };
1144
1145   static const char *const case_sensitive_names[]
1146     = { "on", "off", "auto", NULL };
1147
1148   language_gdbarch_data
1149     = gdbarch_data_register_post_init (language_gdbarch_post_init);
1150
1151   /* GDB commands for language specific stuff.  */
1152
1153   add_prefix_cmd ("check", no_class, set_check,
1154                   _("Set the status of the type/range checker."),
1155                   &setchecklist, "set check ", 0, &setlist);
1156   add_alias_cmd ("c", "check", no_class, 1, &setlist);
1157   add_alias_cmd ("ch", "check", no_class, 1, &setlist);
1158
1159   add_prefix_cmd ("check", no_class, show_check,
1160                   _("Show the status of the type/range checker."),
1161                   &showchecklist, "show check ", 0, &showlist);
1162   add_alias_cmd ("c", "check", no_class, 1, &showlist);
1163   add_alias_cmd ("ch", "check", no_class, 1, &showlist);
1164
1165   add_setshow_enum_cmd ("range", class_support, type_or_range_names,
1166                         &range,
1167                         _("Set range checking (on/warn/off/auto)."),
1168                         _("Show range checking (on/warn/off/auto)."),
1169                         NULL, set_range_command,
1170                         show_range_command,
1171                         &setchecklist, &showchecklist);
1172
1173   add_setshow_enum_cmd ("case-sensitive", class_support, case_sensitive_names,
1174                         &case_sensitive, _("\
1175 Set case sensitivity in name search (on/off/auto)."), _("\
1176 Show case sensitivity in name search (on/off/auto)."), _("\
1177 For Fortran the default is off; for other languages the default is on."),
1178                         set_case_command,
1179                         show_case_command,
1180                         &setlist, &showlist);
1181
1182   add_set_language_command ();
1183
1184   language = "auto";
1185   range = "auto";
1186   case_sensitive = "auto";
1187
1188   /* Have the above take effect.  */
1189   set_language (language_auto);
1190 }