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 #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 non-zero if TYPE should be passed (and returned) by
 656    reference at the language level.  */
 657 int
 658 language_pass_by_reference (struct type *type)
 659 {
 660   return current_language->la_pass_by_reference (type);
 661 }
 662
 663 /* Return zero; by default, types are passed by value at the language
 664    level.  The target ABI may pass or return some structs by reference
 665    independent of this.  */
 666 int
 667 default_pass_by_reference (struct type *type)
 668 {
 669   return 0;
 670 }
 671
 672 /* Return the default string containing the list of characters
 673    delimiting words.  This is a reasonable default value that
 674    most languages should be able to use.  */
 675
 676 const char *
 677 default_word_break_characters (void)
 678 {
 679   return " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-";
 680 }
 681
 682 /* Print the index of array elements using the C99 syntax.  */
 683
 684 void
 685 default_print_array_index (struct value *index_value, struct ui_file *stream,
 686                            const struct value_print_options *options)
 687 {
 688   fprintf_filtered (stream, "[");
 689   LA_VALUE_PRINT (index_value, stream, options);
 690   fprintf_filtered (stream, "] = ");
 691 }
 692
 693 /* See language.h.  */
 694
 695 bool
 696 default_symbol_name_matcher (const char *symbol_search_name,
 697                              const lookup_name_info &lookup_name,
 698                              completion_match_result *comp_match_res)
 699 {
 700   const std::string &name = lookup_name.name ();
 701   completion_match_for_lcd *match_for_lcd
 702     = (comp_match_res != NULL ? &comp_match_res->match_for_lcd : NULL);
 703   strncmp_iw_mode mode = (lookup_name.completion_mode ()
 704                           ? strncmp_iw_mode::NORMAL
 705                           : strncmp_iw_mode::MATCH_PARAMS);
 706
 707   if (strncmp_iw_with_mode (symbol_search_name, name.c_str (), name.size (),
 708                             mode, language_minimal, match_for_lcd) == 0)
 709     {
 710       if (comp_match_res != NULL)
 711         comp_match_res->set_match (symbol_search_name);
 712       return true;
 713     }
 714   else
 715     return false;
 716 }
 717
 718 /* See language.h.  */
 719
 720 bool
 721 default_is_string_type_p (struct type *type)
 722 {
 723   type = check_typedef (type);
 724   while (TYPE_CODE (type) == TYPE_CODE_REF)
 725     {
 726       type = TYPE_TARGET_TYPE (type);
 727       type = check_typedef (type);
 728     }
 729   return (TYPE_CODE (type)  == TYPE_CODE_STRING);
 730 }
 731
 732 /* See language.h.  */
 733
 734 symbol_name_matcher_ftype *
 735 get_symbol_name_matcher (const language_defn *lang,
 736                          const lookup_name_info &lookup_name)
 737 {
 738   /* If currently in Ada mode, and the lookup name is wrapped in
 739      '<...>', hijack all symbol name comparisons using the Ada
 740      matcher, which handles the verbatim matching.  */
 741   if (current_language->la_language == language_ada
 742       && lookup_name.ada ().verbatim_p ())
 743     return current_language->la_get_symbol_name_matcher (lookup_name);
 744
 745   if (lang->la_get_symbol_name_matcher != nullptr)
 746     return lang->la_get_symbol_name_matcher (lookup_name);
 747   return default_symbol_name_matcher;
 748 }
 749
 750 /* Define the language that is no language.  */
 751
 752 static int
 753 unk_lang_parser (struct parser_state *ps)
 754 {
 755   return 1;
 756 }
 757
 758 static void
 759 unk_lang_emit_char (int c, struct type *type, struct ui_file *stream,
 760                     int quoter)
 761 {
 762   error (_("internal error - unimplemented "
 763            "function unk_lang_emit_char called."));
 764 }
 765
 766 static void
 767 unk_lang_printchar (int c, struct type *type, struct ui_file *stream)
 768 {
 769   error (_("internal error - unimplemented "
 770            "function unk_lang_printchar called."));
 771 }
 772
 773 static void
 774 unk_lang_printstr (struct ui_file *stream, struct type *type,
 775                    const gdb_byte *string, unsigned int length,
 776                    const char *encoding, int force_ellipses,
 777                    const struct value_print_options *options)
 778 {
 779   error (_("internal error - unimplemented "
 780            "function unk_lang_printstr called."));
 781 }
 782
 783 static void
 784 unk_lang_print_type (struct type *type, const char *varstring,
 785                      struct ui_file *stream, int show, int level,
 786                      const struct type_print_options *flags)
 787 {
 788   error (_("internal error - unimplemented "
 789            "function unk_lang_print_type called."));
 790 }
 791
 792 static void
 793 unk_lang_val_print (struct type *type,
 794                     int embedded_offset, CORE_ADDR address,
 795                     struct ui_file *stream, int recurse,
 796                     struct value *val,
 797                     const struct value_print_options *options)
 798 {
 799   error (_("internal error - unimplemented "
 800            "function unk_lang_val_print called."));
 801 }
 802
 803 static void
 804 unk_lang_value_print (struct value *val, struct ui_file *stream,
 805                       const struct value_print_options *options)
 806 {
 807   error (_("internal error - unimplemented "
 808            "function unk_lang_value_print called."));
 809 }
 810
 811 static CORE_ADDR unk_lang_trampoline (struct frame_info *frame, CORE_ADDR pc)
 812 {
 813   return 0;
 814 }
 815
 816 /* Unknown languages just use the cplus demangler.  */
 817 static char *unk_lang_demangle (const char *mangled, int options)
 818 {
 819   return gdb_demangle (mangled, options);
 820 }
 821
 822 static char *unk_lang_class_name (const char *mangled)
 823 {
 824   return NULL;
 825 }
 826
 827 static const struct op_print unk_op_print_tab[] =
 828 {
 829   {NULL, OP_NULL, PREC_NULL, 0}
 830 };
 831
 832 static void
 833 unknown_language_arch_info (struct gdbarch *gdbarch,
 834                             struct language_arch_info *lai)
 835 {
 836   lai->string_char_type = builtin_type (gdbarch)->builtin_char;
 837   lai->bool_type_default = builtin_type (gdbarch)->builtin_int;
 838   lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, 1,
 839                                                        struct type *);
 840 }
 841
 842 const struct language_defn unknown_language_defn =
 843 {
 844   "unknown",
 845   "Unknown",
 846   language_unknown,
 847   range_check_off,
 848   case_sensitive_on,
 849   array_row_major,
 850   macro_expansion_no,
 851   NULL,
 852   &exp_descriptor_standard,
 853   unk_lang_parser,
 854   null_post_parser,
 855   unk_lang_printchar,           /* Print character constant */
 856   unk_lang_printstr,
 857   unk_lang_emit_char,
 858   unk_lang_print_type,          /* Print a type using appropriate syntax */
 859   default_print_typedef,        /* Print a typedef using appropriate syntax */
 860   unk_lang_val_print,           /* Print a value using appropriate syntax */
 861   unk_lang_value_print,         /* Print a top-level value */
 862   default_read_var_value,       /* la_read_var_value */
 863   unk_lang_trampoline,          /* Language specific skip_trampoline */
 864   "this",                       /* name_of_this */
 865   true,                         /* store_sym_names_in_linkage_form_p */
 866   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 867   basic_lookup_transparent_type,/* lookup_transparent_type */
 868   unk_lang_demangle,            /* Language specific symbol demangler */
 869   NULL,
 870   unk_lang_class_name,          /* Language specific
 871                                    class_name_from_physname */
 872   unk_op_print_tab,             /* expression operators for printing */
 873   1,                            /* c-style arrays */
 874   0,                            /* String lower bound */
 875   default_word_break_characters,
 876   default_collect_symbol_completion_matches,
 877   unknown_language_arch_info,   /* la_language_arch_info.  */
 878   default_print_array_index,
 879   default_pass_by_reference,
 880   c_watch_location_expression,
 881   NULL,                         /* la_get_symbol_name_matcher */
 882   iterate_over_symbols,
 883   default_search_name_hash,
 884   &default_varobj_ops,
 885   NULL,
 886   NULL,
 887   default_is_string_type_p,
 888   "{...}"                       /* la_struct_too_deep_ellipsis */
 889 };
 890
 891 /* These two structs define fake entries for the "local" and "auto"
 892    options.  */
 893 const struct language_defn auto_language_defn =
 894 {
 895   "auto",
 896   "Auto",
 897   language_auto,
 898   range_check_off,
 899   case_sensitive_on,
 900   array_row_major,
 901   macro_expansion_no,
 902   NULL,
 903   &exp_descriptor_standard,
 904   unk_lang_parser,
 905   null_post_parser,
 906   unk_lang_printchar,           /* Print character constant */
 907   unk_lang_printstr,
 908   unk_lang_emit_char,
 909   unk_lang_print_type,          /* Print a type using appropriate syntax */
 910   default_print_typedef,        /* Print a typedef using appropriate syntax */
 911   unk_lang_val_print,           /* Print a value using appropriate syntax */
 912   unk_lang_value_print,         /* Print a top-level value */
 913   default_read_var_value,       /* la_read_var_value */
 914   unk_lang_trampoline,          /* Language specific skip_trampoline */
 915   "this",                       /* name_of_this */
 916   false,                        /* store_sym_names_in_linkage_form_p */
 917   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
 918   basic_lookup_transparent_type,/* lookup_transparent_type */
 919   unk_lang_demangle,            /* Language specific symbol demangler */
 920   NULL,
 921   unk_lang_class_name,          /* Language specific
 922                                    class_name_from_physname */
 923   unk_op_print_tab,             /* expression operators for printing */
 924   1,                            /* c-style arrays */
 925   0,                            /* String lower bound */
 926   default_word_break_characters,
 927   default_collect_symbol_completion_matches,
 928   unknown_language_arch_info,   /* la_language_arch_info.  */
 929   default_print_array_index,
 930   default_pass_by_reference,
 931   c_watch_location_expression,
 932   NULL,                         /* la_get_symbol_name_matcher */
 933   iterate_over_symbols,
 934   default_search_name_hash,
 935   &default_varobj_ops,
 936   NULL,
 937   NULL,
 938   default_is_string_type_p,
 939   "{...}"                       /* la_struct_too_deep_ellipsis */
 940 };
 941
 942 \f
 943 /* Per-architecture language information.  */
 944
 945 static struct gdbarch_data *language_gdbarch_data;
 946
 947 struct language_gdbarch
 948 {
 949   /* A vector of per-language per-architecture info.  Indexed by "enum
 950      language".  */
 951   struct language_arch_info arch_info[nr_languages];
 952 };
 953
 954 static void *
 955 language_gdbarch_post_init (struct gdbarch *gdbarch)
 956 {
 957   struct language_gdbarch *l;
 958
 959   l = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct language_gdbarch);
 960   for (const auto &lang : languages)
 961     if (lang != NULL && lang->la_language_arch_info != NULL)
 962       {
 963         lang->la_language_arch_info (gdbarch,
 964                                      l->arch_info + lang->la_language);
 965       }
 966
 967   return l;
 968 }
 969
 970 struct type *
 971 language_string_char_type (const struct language_defn *la,
 972                            struct gdbarch *gdbarch)
 973 {
 974   struct language_gdbarch *ld
 975     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 976
 977   return ld->arch_info[la->la_language].string_char_type;
 978 }
 979
 980 struct type *
 981 language_bool_type (const struct language_defn *la,
 982                     struct gdbarch *gdbarch)
 983 {
 984   struct language_gdbarch *ld
 985     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
 986
 987   if (ld->arch_info[la->la_language].bool_type_symbol)
 988     {
 989       struct symbol *sym;
 990
 991       sym = lookup_symbol (ld->arch_info[la->la_language].bool_type_symbol,
 992                            NULL, VAR_DOMAIN, NULL).symbol;
 993       if (sym)
 994         {
 995           struct type *type = SYMBOL_TYPE (sym);
 996
 997           if (type && TYPE_CODE (type) == TYPE_CODE_BOOL)
 998             return type;
 999         }
1000     }
1001
1002   return ld->arch_info[la->la_language].bool_type_default;
1003 }
1004
1005 /* Helper function for primitive type lookup.  */
1006
1007 static struct type **
1008 language_lookup_primitive_type_1 (const struct language_arch_info *lai,
1009                                   const char *name)
1010 {
1011   struct type **p;
1012
1013   for (p = lai->primitive_type_vector; (*p) != NULL; p++)
1014     {
1015       if (strcmp (TYPE_NAME (*p), name) == 0)
1016         return p;
1017     }
1018   return NULL;
1019 }
1020
1021 /* See language.h.  */
1022
1023 struct type *
1024 language_lookup_primitive_type (const struct language_defn *la,
1025                                 struct gdbarch *gdbarch,
1026                                 const char *name)
1027 {
1028   struct language_gdbarch *ld =
1029     (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1030   struct type **typep;
1031
1032   typep = language_lookup_primitive_type_1 (&ld->arch_info[la->la_language],
1033                                             name);
1034   if (typep == NULL)
1035     return NULL;
1036   return *typep;
1037 }
1038
1039 /* Helper function for type lookup as a symbol.
1040    Create the symbol corresponding to type TYPE in language LANG.  */
1041
1042 static struct symbol *
1043 language_alloc_type_symbol (enum language lang, struct type *type)
1044 {
1045   struct symbol *symbol;
1046   struct gdbarch *gdbarch;
1047
1048   gdb_assert (!TYPE_OBJFILE_OWNED (type));
1049
1050   gdbarch = TYPE_OWNER (type).gdbarch;
1051   symbol = new (gdbarch_obstack (gdbarch)) struct symbol ();
1052
1053   symbol->name = TYPE_NAME (type);
1054   symbol->set_language (lang, nullptr);
1055   symbol->owner.arch = gdbarch;
1056   SYMBOL_OBJFILE_OWNED (symbol) = 0;
1057   SYMBOL_TYPE (symbol) = type;
1058   SYMBOL_DOMAIN (symbol) = VAR_DOMAIN;
1059   SYMBOL_ACLASS_INDEX (symbol) = LOC_TYPEDEF;
1060
1061   return symbol;
1062 }
1063
1064 /* Initialize the primitive type symbols of language LD.
1065    The primitive type vector must have already been initialized.  */
1066
1067 static void
1068 language_init_primitive_type_symbols (struct language_arch_info *lai,
1069                                       const struct language_defn *la,
1070                                       struct gdbarch *gdbarch)
1071 {
1072   int n;
1073
1074   gdb_assert (lai->primitive_type_vector != NULL);
1075
1076   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1077     continue;
1078
1079   lai->primitive_type_symbols
1080     = GDBARCH_OBSTACK_CALLOC (gdbarch, n + 1, struct symbol *);
1081
1082   for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
1083     {
1084       lai->primitive_type_symbols[n]
1085         = language_alloc_type_symbol (la->la_language,
1086                                       lai->primitive_type_vector[n]);
1087     }
1088
1089   /* Note: The result of symbol lookup is normally a symbol *and* the block
1090      it was found in.  Builtin types don't live in blocks.  We *could* give
1091      them one, but there is no current need so to keep things simple symbol
1092      lookup is extended to allow for BLOCK_FOUND to be NULL.  */
1093 }
1094
1095 /* See language.h.  */
1096
1097 struct symbol *
1098 language_lookup_primitive_type_as_symbol (const struct language_defn *la,
1099                                           struct gdbarch *gdbarch,
1100                                           const char *name)
1101 {
1102   struct language_gdbarch *ld
1103     = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
1104   struct language_arch_info *lai = &ld->arch_info[la->la_language];
1105   struct type **typep;
1106   struct symbol *sym;
1107
1108   if (symbol_lookup_debug)
1109     {
1110       fprintf_unfiltered (gdb_stdlog,
1111                           "language_lookup_primitive_type_as_symbol"
1112                           " (%s, %s, %s)",
1113                           la->la_name, host_address_to_string (gdbarch), name);
1114     }
1115
1116   typep = language_lookup_primitive_type_1 (lai, name);
1117   if (typep == NULL)
1118     {
1119       if (symbol_lookup_debug)
1120         fprintf_unfiltered (gdb_stdlog, " = NULL\n");
1121       return NULL;
1122     }
1123
1124   /* The set of symbols is lazily initialized.  */
1125   if (lai->primitive_type_symbols == NULL)
1126     language_init_primitive_type_symbols (lai, la, gdbarch);
1127
1128   sym = lai->primitive_type_symbols[typep - lai->primitive_type_vector];
1129
1130   if (symbol_lookup_debug)
1131     fprintf_unfiltered (gdb_stdlog, " = %s\n", host_address_to_string (sym));
1132   return sym;
1133 }
1134
1135 /* Initialize the language routines.  */
1136
1137 void
1138 _initialize_language (void)
1139 {
1140   static const char *const type_or_range_names[]
1141     = { "on", "off", "warn", "auto", NULL };
1142
1143   static const char *const case_sensitive_names[]
1144     = { "on", "off", "auto", NULL };
1145
1146   language_gdbarch_data
1147     = gdbarch_data_register_post_init (language_gdbarch_post_init);
1148
1149   /* GDB commands for language specific stuff.  */
1150
1151   add_prefix_cmd ("check", no_class, set_check,
1152                   _("Set the status of the type/range checker."),
1153                   &setchecklist, "set check ", 0, &setlist);
1154   add_alias_cmd ("c", "check", no_class, 1, &setlist);
1155   add_alias_cmd ("ch", "check", no_class, 1, &setlist);
1156
1157   add_prefix_cmd ("check", no_class, show_check,
1158                   _("Show the status of the type/range checker."),
1159                   &showchecklist, "show check ", 0, &showlist);
1160   add_alias_cmd ("c", "check", no_class, 1, &showlist);
1161   add_alias_cmd ("ch", "check", no_class, 1, &showlist);
1162
1163   add_setshow_enum_cmd ("range", class_support, type_or_range_names,
1164                         &range,
1165                         _("Set range checking (on/warn/off/auto)."),
1166                         _("Show range checking (on/warn/off/auto)."),
1167                         NULL, set_range_command,
1168                         show_range_command,
1169                         &setchecklist, &showchecklist);
1170
1171   add_setshow_enum_cmd ("case-sensitive", class_support, case_sensitive_names,
1172                         &case_sensitive, _("\
1173 Set case sensitivity in name search (on/off/auto)."), _("\
1174 Show case sensitivity in name search (on/off/auto)."), _("\
1175 For Fortran the default is off; for other languages the default is on."),
1176                         set_case_command,
1177                         show_case_command,
1178                         &setlist, &showlist);
1179
1180   add_set_language_command ();
1181
1182   language = "auto";
1183   range = "auto";
1184   case_sensitive = "auto";
1185
1186   /* Have the above take effect.  */
1187   set_language (language_auto);
1188 }