1 /* Source-language-related definitions 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 #if !defined (LANGUAGE_H) 24 #define LANGUAGE_H 1 25 26 #include "symtab.h" 27 #include "common/function-view.h" 28 #include "expression.h" 29 30 /* Forward decls for prototypes. */ 31 struct value; 32 struct objfile; 33 struct frame_info; 34 struct ui_file; 35 struct value_print_options; 36 struct type_print_options; 37 struct lang_varobj_ops; 38 struct parser_state; 39 class compile_instance; 40 struct completion_match_for_lcd; 41 42 #define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */ 43 44 /* range_mode == 45 range_mode_auto: range_check set automatically to default of language. 46 range_mode_manual: range_check set manually by user. */ 47 48 extern enum range_mode 49 { 50 range_mode_auto, range_mode_manual 51 } 52 range_mode; 53 54 /* range_check == 55 range_check_on: Ranges are checked in GDB expressions, producing errors. 56 range_check_warn: Ranges are checked, producing warnings. 57 range_check_off: Ranges are not checked in GDB expressions. */ 58 59 extern enum range_check 60 { 61 range_check_off, range_check_warn, range_check_on 62 } 63 range_check; 64 65 /* case_mode == 66 case_mode_auto: case_sensitivity set upon selection of scope. 67 case_mode_manual: case_sensitivity set only by user. */ 68 69 extern enum case_mode 70 { 71 case_mode_auto, case_mode_manual 72 } 73 case_mode; 74 75 /* array_ordering == 76 array_row_major: Arrays are in row major order. 77 array_column_major: Arrays are in column major order. */ 78 79 extern enum array_ordering 80 { 81 array_row_major, array_column_major 82 } 83 array_ordering; 84 85 86 /* case_sensitivity == 87 case_sensitive_on: Case sensitivity in name matching is used. 88 case_sensitive_off: Case sensitivity in name matching is not used. */ 89 90 extern enum case_sensitivity 91 { 92 case_sensitive_on, case_sensitive_off 93 } 94 case_sensitivity; 95 96 97 /* macro_expansion == 98 macro_expansion_no: No macro expansion is available. 99 macro_expansion_c: C-like macro expansion is available. */ 100 101 enum macro_expansion 102 { 103 macro_expansion_no, macro_expansion_c 104 }; 105 106 107 /* Per architecture (OS/ABI) language information. */ 108 109 struct language_arch_info 110 { 111 /* Its primitive types. This is a vector ended by a NULL pointer. 112 These types can be specified by name in parsing types in 113 expressions, regardless of whether the program being debugged 114 actually defines such a type. */ 115 struct type **primitive_type_vector; 116 117 /* Symbol wrappers around primitive_type_vector, so that the symbol lookup 118 machinery can return them. */ 119 struct symbol **primitive_type_symbols; 120 121 /* Type of elements of strings. */ 122 struct type *string_char_type; 123 124 /* Symbol name of type to use as boolean type, if defined. */ 125 const char *bool_type_symbol; 126 /* Otherwise, this is the default boolean builtin type. */ 127 struct type *bool_type_default; 128 }; 129 130 /* Structure tying together assorted information about a language. */ 131 132 struct language_defn 133 { 134 /* Name of the language. */ 135 136 const char *la_name; 137 138 /* Natural or official name of the language. */ 139 140 const char *la_natural_name; 141 142 /* its symtab language-enum (defs.h). */ 143 144 enum language la_language; 145 146 /* Default range checking. */ 147 148 enum range_check la_range_check; 149 150 /* Default case sensitivity. */ 151 enum case_sensitivity la_case_sensitivity; 152 153 /* Multi-dimensional array ordering. */ 154 enum array_ordering la_array_ordering; 155 156 /* Style of macro expansion, if any, supported by this language. */ 157 enum macro_expansion la_macro_expansion; 158 159 /* A NULL-terminated array of file extensions for this language. 160 The extension must include the ".", like ".c". If this 161 language doesn't need to provide any filename extensions, this 162 may be NULL. */ 163 164 const char *const *la_filename_extensions; 165 166 /* Definitions related to expression printing, prefixifying, and 167 dumping. */ 168 169 const struct exp_descriptor *la_exp_desc; 170 171 /* Parser function. */ 172 173 int (*la_parser) (struct parser_state *); 174 175 /* Given an expression *EXPP created by prefixifying the result of 176 la_parser, perform any remaining processing necessary to complete 177 its translation. *EXPP may change; la_post_parser is responsible 178 for releasing its previous contents, if necessary. If 179 VOID_CONTEXT_P, then no value is expected from the expression. */ 180 181 void (*la_post_parser) (expression_up *expp, int void_context_p); 182 183 void (*la_printchar) (int ch, struct type *chtype, 184 struct ui_file * stream); 185 186 void (*la_printstr) (struct ui_file * stream, struct type *elttype, 187 const gdb_byte *string, unsigned int length, 188 const char *encoding, int force_ellipses, 189 const struct value_print_options *); 190 191 void (*la_emitchar) (int ch, struct type *chtype, 192 struct ui_file * stream, int quoter); 193 194 /* Print a type using syntax appropriate for this language. */ 195 196 void (*la_print_type) (struct type *, const char *, struct ui_file *, int, 197 int, const struct type_print_options *); 198 199 /* Print a typedef using syntax appropriate for this language. 200 TYPE is the underlying type. NEW_SYMBOL is the symbol naming 201 the type. STREAM is the output stream on which to print. */ 202 203 void (*la_print_typedef) (struct type *type, struct symbol *new_symbol, 204 struct ui_file *stream); 205 206 /* Print a value using syntax appropriate for this language. 207 208 TYPE is the type of the sub-object to be printed. 209 210 EMBEDDED_OFFSET is the offset into the outermost object of the 211 sub-object represented by TYPE. This is the object which this 212 call should print. Note that the enclosing type is not 213 available. 214 215 ADDRESS is the address in the inferior of the enclosing object. 216 217 STREAM is the stream on which the value is to be printed. 218 219 RECURSE is the recursion depth. It is zero-based. 220 221 OPTIONS are the formatting options to be used when 222 printing. */ 223 224 void (*la_val_print) (struct type *type, 225 int embedded_offset, CORE_ADDR address, 226 struct ui_file *stream, int recurse, 227 struct value *val, 228 const struct value_print_options *options); 229 230 /* Print a top-level value using syntax appropriate for this language. */ 231 232 void (*la_value_print) (struct value *, struct ui_file *, 233 const struct value_print_options *); 234 235 /* Given a symbol VAR, the corresponding block VAR_BLOCK (if any) and a 236 stack frame id FRAME, read the value of the variable and return (pointer 237 to a) struct value containing the value. 238 239 VAR_BLOCK is needed if there's a possibility for VAR to be outside 240 FRAME. This is what happens if FRAME correspond to a nested function 241 and VAR is defined in the outer function. If callers know that VAR is 242 located in FRAME or is global/static, NULL can be passed as VAR_BLOCK. 243 244 Throw an error if the variable cannot be found. */ 245 246 struct value *(*la_read_var_value) (struct symbol *var, 247 const struct block *var_block, 248 struct frame_info *frame); 249 250 /* PC is possibly an unknown languages trampoline. 251 If that PC falls in a trampoline belonging to this language, 252 return the address of the first pc in the real function, or 0 253 if it isn't a language tramp for this language. */ 254 CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR); 255 256 /* Now come some hooks for lookup_symbol. */ 257 258 /* If this is non-NULL, specifies the name that of the implicit 259 local variable that refers to the current object instance. */ 260 261 const char *la_name_of_this; 262 263 /* True if the symbols names should be stored in GDB's data structures 264 for minimal/partial/full symbols using their linkage (aka mangled) 265 form; false if the symbol names should be demangled first. 266 267 Most languages implement symbol lookup by comparing the demangled 268 names, in which case it is advantageous to store that information 269 already demangled, and so would set this field to false. 270 271 On the other hand, some languages have opted for doing symbol 272 lookups by comparing mangled names instead, for reasons usually 273 specific to the language. Those languages should set this field 274 to true. 275 276 And finally, other languages such as C or Asm do not have 277 the concept of mangled vs demangled name, so those languages 278 should set this field to true as well, to prevent any accidental 279 demangling through an unrelated language's demangler. */ 280 281 const bool la_store_sym_names_in_linkage_form_p; 282 283 /* This is a function that lookup_symbol will call when it gets to 284 the part of symbol lookup where C looks up static and global 285 variables. */ 286 287 struct block_symbol (*la_lookup_symbol_nonlocal) 288 (const struct language_defn *, 289 const char *, 290 const struct block *, 291 const domain_enum); 292 293 /* Find the definition of the type with the given name. */ 294 struct type *(*la_lookup_transparent_type) (const char *); 295 296 /* Return demangled language symbol, or NULL. */ 297 char *(*la_demangle) (const char *mangled, int options); 298 299 /* Demangle a symbol according to this language's rules. Unlike 300 la_demangle, this does not take any options. 301 302 *DEMANGLED will be set by this function. 303 304 If this function returns 0, then *DEMANGLED must always be set 305 to NULL. 306 307 If this function returns 1, the implementation may set this to 308 a xmalloc'd string holding the demangled form. However, it is 309 not required to. The string, if any, is owned by the caller. 310 311 The resulting string should be of the form that will be 312 installed into a symbol. */ 313 int (*la_sniff_from_mangled_name) (const char *mangled, char **demangled); 314 315 /* Return class name of a mangled method name or NULL. */ 316 char *(*la_class_name_from_physname) (const char *physname); 317 318 /* Table for printing expressions. */ 319 320 const struct op_print *la_op_print_tab; 321 322 /* Zero if the language has first-class arrays. True if there are no 323 array values, and array objects decay to pointers, as in C. */ 324 325 char c_style_arrays; 326 327 /* Index to use for extracting the first element of a string. */ 328 char string_lower_bound; 329 330 /* The list of characters forming word boundaries. */ 331 const char *(*la_word_break_characters) (void); 332 333 /* Add to the completion tracker all symbols which are possible 334 completions for TEXT. WORD is the entire command on which the 335 completion is being made. If CODE is TYPE_CODE_UNDEF, then all 336 symbols should be examined; otherwise, only STRUCT_DOMAIN 337 symbols whose type has a code of CODE should be matched. */ 338 void (*la_collect_symbol_completion_matches) 339 (completion_tracker &tracker, 340 complete_symbol_mode mode, 341 symbol_name_match_type match_type, 342 const char *text, 343 const char *word, 344 enum type_code code); 345 346 /* The per-architecture (OS/ABI) language information. */ 347 void (*la_language_arch_info) (struct gdbarch *, 348 struct language_arch_info *); 349 350 /* Print the index of an element of an array. */ 351 void (*la_print_array_index) (struct value *index_value, 352 struct ui_file *stream, 353 const struct value_print_options *options); 354 355 /* Return non-zero if TYPE should be passed (and returned) by 356 reference at the language level. */ 357 int (*la_pass_by_reference) (struct type *type); 358 359 /* Obtain a string from the inferior, storing it in a newly allocated 360 buffer in BUFFER, which should be freed by the caller. If the 361 in- and out-parameter *LENGTH is specified at -1, the string is 362 read until a null character of the appropriate width is found - 363 otherwise the string is read to the length of characters specified. 364 On completion, *LENGTH will hold the size of the string in characters. 365 If a *LENGTH of -1 was specified it will count only actual 366 characters, excluding any eventual terminating null character. 367 Otherwise *LENGTH will include all characters - including any nulls. 368 CHARSET will hold the encoding used in the string. */ 369 void (*la_get_string) (struct value *value, 370 gdb::unique_xmalloc_ptr<gdb_byte> *buffer, 371 int *length, struct type **chartype, 372 const char **charset); 373 374 /* Return an expression that can be used for a location 375 watchpoint. TYPE is a pointer type that points to the memory 376 to watch, and ADDR is the address of the watched memory. */ 377 gdb::unique_xmalloc_ptr<char> (*la_watch_location_expression) 378 (struct type *type, CORE_ADDR addr); 379 380 /* Return a pointer to the function that should be used to match a 381 symbol name against LOOKUP_NAME, according to this language's 382 rules. The matching algorithm depends on LOOKUP_NAME. For 383 example, on Ada, the matching algorithm depends on the symbol 384 name (wild/full/verbatim matching), and on whether we're doing 385 a normal lookup or a completion match lookup. 386 387 This field may be NULL, in which case 388 default_symbol_name_matcher is used to perform the 389 matching. */ 390 symbol_name_matcher_ftype *(*la_get_symbol_name_matcher) 391 (const lookup_name_info &); 392 393 /* Find all symbols in the current program space matching NAME in 394 DOMAIN, according to this language's rules. 395 396 The search is done in BLOCK only. 397 The caller is responsible for iterating up through superblocks 398 if desired. 399 400 For each one, call CALLBACK with the symbol. If CALLBACK 401 returns false, the iteration ends at that point. 402 403 This field may not be NULL. If the language does not need any 404 special processing here, 'iterate_over_symbols' should be 405 used as the definition. */ 406 void (*la_iterate_over_symbols) 407 (const struct block *block, const lookup_name_info &name, 408 domain_enum domain, 409 gdb::function_view<symbol_found_callback_ftype> callback); 410 411 /* Hash the given symbol search name. Use 412 default_search_name_hash if no special treatment is 413 required. */ 414 unsigned int (*la_search_name_hash) (const char *name); 415 416 /* Various operations on varobj. */ 417 const struct lang_varobj_ops *la_varobj_ops; 418 419 /* If this language allows compilation from the gdb command line, 420 this method should be non-NULL. When called it should return 421 an instance of struct gcc_context appropriate to the language. 422 When defined this method must never return NULL; instead it 423 should throw an exception on failure. The returned compiler 424 instance is owned by its caller and must be deallocated by 425 calling its 'destroy' method. */ 426 427 compile_instance *(*la_get_compile_instance) (void); 428 429 /* This method must be defined if 'la_get_gcc_context' is defined. 430 If 'la_get_gcc_context' is not defined, then this method is 431 ignored. 432 433 This takes the user-supplied text and returns a new bit of code 434 to compile. 435 436 INST is the compiler instance being used. 437 INPUT is the user's input text. 438 GDBARCH is the architecture to use. 439 EXPR_BLOCK is the block in which the expression is being 440 parsed. 441 EXPR_PC is the PC at which the expression is being parsed. */ 442 443 std::string (*la_compute_program) (compile_instance *inst, 444 const char *input, 445 struct gdbarch *gdbarch, 446 const struct block *expr_block, 447 CORE_ADDR expr_pc); 448 449 /* Add fields above this point, so the magic number is always last. */ 450 /* Magic number for compat checking. */ 451 452 long la_magic; 453 454 }; 455 456 #define LANG_MAGIC 910823L 457 458 /* Pointer to the language_defn for our current language. This pointer 459 always points to *some* valid struct; it can be used without checking 460 it for validity. 461 462 The current language affects expression parsing and evaluation 463 (FIXME: it might be cleaner to make the evaluation-related stuff 464 separate exp_opcodes for each different set of semantics. We 465 should at least think this through more clearly with respect to 466 what happens if the language is changed between parsing and 467 evaluation) and printing of things like types and arrays. It does 468 *not* affect symbol-reading-- each source file in a symbol-file has 469 its own language and we should keep track of that regardless of the 470 language when symbols are read. If we want some manual setting for 471 the language of symbol files (e.g. detecting when ".c" files are 472 C++), it should be a separate setting from the current_language. */ 473 474 extern const struct language_defn *current_language; 475 476 /* Pointer to the language_defn expected by the user, e.g. the language 477 of main(), or the language we last mentioned in a message, or C. */ 478 479 extern const struct language_defn *expected_language; 480 481 /* language_mode == 482 language_mode_auto: current_language automatically set upon selection 483 of scope (e.g. stack frame) 484 language_mode_manual: current_language set only by user. */ 485 486 extern enum language_mode 487 { 488 language_mode_auto, language_mode_manual 489 } 490 language_mode; 491 492 struct type *language_bool_type (const struct language_defn *l, 493 struct gdbarch *gdbarch); 494 495 struct type *language_string_char_type (const struct language_defn *l, 496 struct gdbarch *gdbarch); 497 498 /* Look up type NAME in language L, and return its definition for architecture 499 GDBARCH. Returns NULL if not found. */ 500 501 struct type *language_lookup_primitive_type (const struct language_defn *l, 502 struct gdbarch *gdbarch, 503 const char *name); 504 505 /* Wrapper around language_lookup_primitive_type to return the 506 corresponding symbol. */ 507 508 struct symbol * 509 language_lookup_primitive_type_as_symbol (const struct language_defn *l, 510 struct gdbarch *gdbarch, 511 const char *name); 512 513 514 /* These macros define the behaviour of the expression 515 evaluator. */ 516 517 /* Should we range check values against the domain of their type? */ 518 #define RANGE_CHECK (range_check != range_check_off) 519 520 /* "cast" really means conversion. */ 521 /* FIXME -- should be a setting in language_defn. */ 522 #define CAST_IS_CONVERSION(LANG) ((LANG)->la_language == language_c || \ 523 (LANG)->la_language == language_cplus || \ 524 (LANG)->la_language == language_objc) 525 526 extern void language_info (int); 527 528 extern enum language set_language (enum language); 529 530 531 /* This page contains functions that return things that are 532 specific to languages. Each of these functions is based on 533 the current setting of working_lang, which the user sets 534 with the "set language" command. */ 535 536 #define LA_PRINT_TYPE(type,varstring,stream,show,level,flags) \ 537 (current_language->la_print_type(type,varstring,stream,show,level,flags)) 538 539 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \ 540 (current_language->la_print_typedef(type,new_symbol,stream)) 541 542 #define LA_VALUE_PRINT(val,stream,options) \ 543 (current_language->la_value_print(val,stream,options)) 544 545 #define LA_PRINT_CHAR(ch, type, stream) \ 546 (current_language->la_printchar(ch, type, stream)) 547 #define LA_PRINT_STRING(stream, elttype, string, length, encoding, force_ellipses, options) \ 548 (current_language->la_printstr(stream, elttype, string, length, \ 549 encoding, force_ellipses,options)) 550 #define LA_EMIT_CHAR(ch, type, stream, quoter) \ 551 (current_language->la_emitchar(ch, type, stream, quoter)) 552 #define LA_GET_STRING(value, buffer, length, chartype, encoding) \ 553 (current_language->la_get_string(value, buffer, length, chartype, encoding)) 554 555 #define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \ 556 (current_language->la_print_array_index(index_value, stream, options)) 557 558 #define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK) \ 559 (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK)) 560 561 /* Test a character to decide whether it can be printed in literal form 562 or needs to be printed in another representation. For example, 563 in C the literal form of the character with octal value 141 is 'a' 564 and the "other representation" is '\141'. The "other representation" 565 is program language dependent. */ 566 567 #define PRINT_LITERAL_FORM(c) \ 568 ((c) >= 0x20 \ 569 && ((c) < 0x7F || (c) >= 0xA0) \ 570 && (!sevenbit_strings || (c) < 0x80)) 571 572 /* Type predicates */ 573 574 extern int pointer_type (struct type *); 575 576 /* Error messages */ 577 578 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2); 579 580 /* Data: Does this value represent "truth" to the current language? */ 581 582 extern int value_true (struct value *); 583 584 /* Misc: The string representing a particular enum language. */ 585 586 extern enum language language_enum (const char *str); 587 588 extern const struct language_defn *language_def (enum language); 589 590 extern const char *language_str (enum language); 591 592 /* Check for a language-specific trampoline. */ 593 594 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc); 595 596 /* Return demangled language symbol, or NULL. */ 597 extern char *language_demangle (const struct language_defn *current_language, 598 const char *mangled, int options); 599 600 /* A wrapper for la_sniff_from_mangled_name. The arguments and result 601 are as for the method. */ 602 603 extern int language_sniff_from_mangled_name (const struct language_defn *lang, 604 const char *mangled, 605 char **demangled); 606 607 /* Return class name from physname, or NULL. */ 608 extern char *language_class_name_from_physname (const struct language_defn *, 609 const char *physname); 610 611 /* Splitting strings into words. */ 612 extern const char *default_word_break_characters (void); 613 614 /* Print the index of an array element using the C99 syntax. */ 615 extern void default_print_array_index (struct value *index_value, 616 struct ui_file *stream, 617 const struct value_print_options *options); 618 619 /* Return non-zero if TYPE should be passed (and returned) by 620 reference at the language level. */ 621 int language_pass_by_reference (struct type *type); 622 623 /* Return zero; by default, types are passed by value at the language 624 level. The target ABI may pass or return some structs by reference 625 independent of this. */ 626 int default_pass_by_reference (struct type *type); 627 628 /* The default implementation of la_print_typedef. */ 629 void default_print_typedef (struct type *type, struct symbol *new_symbol, 630 struct ui_file *stream); 631 632 void default_get_string (struct value *value, 633 gdb::unique_xmalloc_ptr<gdb_byte> *buffer, 634 int *length, struct type **char_type, 635 const char **charset); 636 637 /* Default name hashing function. */ 638 639 /* Produce an unsigned hash value from SEARCH_NAME that is consistent 640 with strcmp_iw, strcmp, and, at least on Ada symbols, wild_match. 641 That is, two identifiers equivalent according to any of those three 642 comparison operators hash to the same value. */ 643 extern unsigned int default_search_name_hash (const char *search_name); 644 645 void c_get_string (struct value *value, 646 gdb::unique_xmalloc_ptr<gdb_byte> *buffer, 647 int *length, struct type **char_type, 648 const char **charset); 649 650 /* The default implementation of la_symbol_name_matcher. Matches with 651 strncmp_iw. */ 652 extern bool default_symbol_name_matcher 653 (const char *symbol_search_name, 654 const lookup_name_info &lookup_name, 655 completion_match_result *comp_match_res); 656 657 /* Get LANG's symbol_name_matcher method for LOOKUP_NAME. Returns 658 default_symbol_name_matcher if not set. LANG is used as a hint; 659 the function may ignore it depending on the current language and 660 LOOKUP_NAME. Specifically, if the current language is Ada, this 661 may return an Ada matcher regardless of LANG. */ 662 symbol_name_matcher_ftype *get_symbol_name_matcher 663 (const language_defn *lang, const lookup_name_info &lookup_name); 664 665 /* The languages supported by GDB. */ 666 667 extern const struct language_defn auto_language_defn; 668 extern const struct language_defn unknown_language_defn; 669 extern const struct language_defn minimal_language_defn; 670 671 extern const struct language_defn ada_language_defn; 672 extern const struct language_defn asm_language_defn; 673 extern const struct language_defn c_language_defn; 674 extern const struct language_defn cplus_language_defn; 675 extern const struct language_defn d_language_defn; 676 extern const struct language_defn f_language_defn; 677 extern const struct language_defn go_language_defn; 678 extern const struct language_defn m2_language_defn; 679 extern const struct language_defn objc_language_defn; 680 extern const struct language_defn opencl_language_defn; 681 extern const struct language_defn pascal_language_defn; 682 extern const struct language_defn rust_language_defn; 683 684 /* Save the current language and restore it upon destruction. */ 685 686 class scoped_restore_current_language 687 { 688 public: 689 690 explicit scoped_restore_current_language () 691 : m_lang (current_language->la_language) 692 { 693 } 694 695 ~scoped_restore_current_language () 696 { 697 set_language (m_lang); 698 } 699 700 scoped_restore_current_language (const scoped_restore_current_language &) 701 = delete; 702 scoped_restore_current_language &operator= 703 (const scoped_restore_current_language &) = delete; 704 705 private: 706 707 enum language m_lang; 708 }; 709 710 /* If language_mode is language_mode_auto, 711 then switch current language to the language of SYM 712 and restore current language upon destruction. 713 714 Else do nothing. */ 715 716 class scoped_switch_to_sym_language_if_auto 717 { 718 public: 719 720 explicit scoped_switch_to_sym_language_if_auto (const struct symbol *sym) 721 { 722 if (language_mode == language_mode_auto) 723 { 724 m_lang = current_language->la_language; 725 m_switched = true; 726 set_language (SYMBOL_LANGUAGE (sym)); 727 } 728 else 729 { 730 m_switched = false; 731 /* Assign to m_lang to silence a GCC warning. See 732 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80635. */ 733 m_lang = language_unknown; 734 } 735 } 736 737 ~scoped_switch_to_sym_language_if_auto () 738 { 739 if (m_switched) 740 set_language (m_lang); 741 } 742 743 DISABLE_COPY_AND_ASSIGN (scoped_switch_to_sym_language_if_auto); 744 745 private: 746 bool m_switched; 747 enum language m_lang; 748 }; 749 750 #endif /* defined (LANGUAGE_H) */ 751