1 /* Source-language-related definitions for GDB.
3 Copyright (C) 1991-2014 Free Software Foundation, Inc.
5 Contributed by the Department of Computer Science at the State University
6 of New York at Buffalo.
8 This file is part of GDB.
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.
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.
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/>. */
23 #if !defined (LANGUAGE_H)
28 /* Forward decls for prototypes. */
34 struct value_print_options;
35 struct type_print_options;
36 struct lang_varobj_ops;
38 struct compile_instance;
40 #define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */
43 range_mode_auto: range_check set automatically to default of language.
44 range_mode_manual: range_check set manually by user. */
46 extern enum range_mode
48 range_mode_auto, range_mode_manual
53 range_check_on: Ranges are checked in GDB expressions, producing errors.
54 range_check_warn: Ranges are checked, producing warnings.
55 range_check_off: Ranges are not checked in GDB expressions. */
57 extern enum range_check
59 range_check_off, range_check_warn, range_check_on
64 case_mode_auto: case_sensitivity set upon selection of scope.
65 case_mode_manual: case_sensitivity set only by user. */
69 case_mode_auto, case_mode_manual
74 array_row_major: Arrays are in row major order.
75 array_column_major: Arrays are in column major order. */
77 extern enum array_ordering
79 array_row_major, array_column_major
84 /* case_sensitivity ==
85 case_sensitive_on: Case sensitivity in name matching is used.
86 case_sensitive_off: Case sensitivity in name matching is not used. */
88 extern enum case_sensitivity
90 case_sensitive_on, case_sensitive_off
96 macro_expansion_no: No macro expansion is available.
97 macro_expansion_c: C-like macro expansion is available. */
101 macro_expansion_no, macro_expansion_c
105 /* Per architecture (OS/ABI) language information. */
107 struct language_arch_info
109 /* Its primitive types. This is a vector ended by a NULL pointer.
110 These types can be specified by name in parsing types in
111 expressions, regardless of whether the program being debugged
112 actually defines such a type. */
113 struct type **primitive_type_vector;
114 /* Type of elements of strings. */
115 struct type *string_char_type;
117 /* Symbol name of type to use as boolean type, if defined. */
118 const char *bool_type_symbol;
119 /* Otherwise, this is the default boolean builtin type. */
120 struct type *bool_type_default;
123 /* A pointer to a function expected to return nonzero if
124 SYMBOL_SEARCH_NAME matches the given LOOKUP_NAME.
126 SYMBOL_SEARCH_NAME should be a symbol's "search" name.
127 LOOKUP_NAME should be the name of an entity after it has been
128 transformed for lookup. */
130 typedef int (*symbol_name_cmp_ftype) (const char *symbol_search_name,
131 const char *lookup_name);
133 /* Structure tying together assorted information about a language. */
137 /* Name of the language. */
141 /* Natural or official name of the language. */
143 const char *la_natural_name;
145 /* its symtab language-enum (defs.h). */
147 enum language la_language;
149 /* Default range checking. */
151 enum range_check la_range_check;
153 /* Default case sensitivity. */
154 enum case_sensitivity la_case_sensitivity;
156 /* Multi-dimensional array ordering. */
157 enum array_ordering la_array_ordering;
159 /* Style of macro expansion, if any, supported by this language. */
160 enum macro_expansion la_macro_expansion;
162 /* Definitions related to expression printing, prefixifying, and
165 const struct exp_descriptor *la_exp_desc;
167 /* Parser function. */
169 int (*la_parser) (struct parser_state *);
171 /* Parser error function. */
173 void (*la_error) (char *);
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. */
181 void (*la_post_parser) (struct expression ** expp, int void_context_p);
183 void (*la_printchar) (int ch, struct type *chtype,
184 struct ui_file * stream);
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 *);
191 void (*la_emitchar) (int ch, struct type *chtype,
192 struct ui_file * stream, int quoter);
194 /* Print a type using syntax appropriate for this language. */
196 void (*la_print_type) (struct type *, const char *, struct ui_file *, int,
197 int, const struct type_print_options *);
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. */
203 void (*la_print_typedef) (struct type *type, struct symbol *new_symbol,
204 struct ui_file *stream);
206 /* Print a value using syntax appropriate for this language.
208 TYPE is the type of the sub-object to be printed.
210 CONTENTS holds the bits of the value. This holds the entire
213 EMBEDDED_OFFSET is the offset into the outermost object of the
214 sub-object represented by TYPE. This is the object which this
215 call should print. Note that the enclosing type is not
218 ADDRESS is the address in the inferior of the enclosing object.
220 STREAM is the stream on which the value is to be printed.
222 RECURSE is the recursion depth. It is zero-based.
224 OPTIONS are the formatting options to be used when
227 void (*la_val_print) (struct type *type,
228 const gdb_byte *contents,
229 int embedded_offset, CORE_ADDR address,
230 struct ui_file *stream, int recurse,
231 const struct value *val,
232 const struct value_print_options *options);
234 /* Print a top-level value using syntax appropriate for this language. */
236 void (*la_value_print) (struct value *, struct ui_file *,
237 const struct value_print_options *);
239 /* Given a symbol VAR, and a stack frame id FRAME, read the value
240 of the variable an return (pointer to a) struct value containing
243 Throw an error if the variable cannot be found. */
245 struct value *(*la_read_var_value) (struct symbol *var,
246 struct frame_info *frame);
248 /* PC is possibly an unknown languages trampoline.
249 If that PC falls in a trampoline belonging to this language,
250 return the address of the first pc in the real function, or 0
251 if it isn't a language tramp for this language. */
252 CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR);
254 /* Now come some hooks for lookup_symbol. */
256 /* If this is non-NULL, specifies the name that of the implicit
257 local variable that refers to the current object instance. */
259 char *la_name_of_this;
261 /* This is a function that lookup_symbol will call when it gets to
262 the part of symbol lookup where C looks up static and global
265 struct symbol *(*la_lookup_symbol_nonlocal) (const char *,
266 const struct block *,
269 /* Find the definition of the type with the given name. */
270 struct type *(*la_lookup_transparent_type) (const char *);
272 /* Return demangled language symbol, or NULL. */
273 char *(*la_demangle) (const char *mangled, int options);
275 /* Return class name of a mangled method name or NULL. */
276 char *(*la_class_name_from_physname) (const char *physname);
278 /* Table for printing expressions. */
280 const struct op_print *la_op_print_tab;
282 /* Zero if the language has first-class arrays. True if there are no
283 array values, and array objects decay to pointers, as in C. */
287 /* Index to use for extracting the first element of a string. */
288 char string_lower_bound;
290 /* The list of characters forming word boundaries. */
291 char *(*la_word_break_characters) (void);
293 /* Should return a vector of all symbols which are possible
294 completions for TEXT. WORD is the entire command on which the
295 completion is being made. If CODE is TYPE_CODE_UNDEF, then all
296 symbols should be examined; otherwise, only STRUCT_DOMAIN
297 symbols whose type has a code of CODE should be matched. */
298 VEC (char_ptr) *(*la_make_symbol_completion_list) (const char *text,
300 enum type_code code);
302 /* The per-architecture (OS/ABI) language information. */
303 void (*la_language_arch_info) (struct gdbarch *,
304 struct language_arch_info *);
306 /* Print the index of an element of an array. */
307 void (*la_print_array_index) (struct value *index_value,
308 struct ui_file *stream,
309 const struct value_print_options *options);
311 /* Return non-zero if TYPE should be passed (and returned) by
312 reference at the language level. */
313 int (*la_pass_by_reference) (struct type *type);
315 /* Obtain a string from the inferior, storing it in a newly allocated
316 buffer in BUFFER, which should be freed by the caller. If the
317 in- and out-parameter *LENGTH is specified at -1, the string is
318 read until a null character of the appropriate width is found -
319 otherwise the string is read to the length of characters specified.
320 On completion, *LENGTH will hold the size of the string in characters.
321 If a *LENGTH of -1 was specified it will count only actual
322 characters, excluding any eventual terminating null character.
323 Otherwise *LENGTH will include all characters - including any nulls.
324 CHARSET will hold the encoding used in the string. */
325 void (*la_get_string) (struct value *value, gdb_byte **buffer, int *length,
326 struct type **chartype, const char **charset);
328 /* Return a pointer to the function that should be used to match
329 a symbol name against LOOKUP_NAME. This is mostly for languages
330 such as Ada where the matching algorithm depends on LOOKUP_NAME.
332 This field may be NULL, in which case strcmp_iw will be used
333 to perform the matching. */
334 symbol_name_cmp_ftype (*la_get_symbol_name_cmp) (const char *lookup_name);
336 /* Find all symbols in the current program space matching NAME in
337 DOMAIN, according to this language's rules.
339 The search is done in BLOCK only.
340 The caller is responsible for iterating up through superblocks
343 For each one, call CALLBACK with the symbol and the DATA
344 argument. If CALLBACK returns zero, the iteration ends at that
347 This field may not be NULL. If the language does not need any
348 special processing here, 'iterate_over_symbols' should be
349 used as the definition. */
350 void (*la_iterate_over_symbols) (const struct block *block,
353 symbol_found_callback_ftype *callback,
356 /* Various operations on varobj. */
357 const struct lang_varobj_ops *la_varobj_ops;
359 /* If this language allows compilation from the gdb command line,
360 this method should be non-NULL. When called it should return
361 an instance of struct gcc_context appropriate to the language.
362 When defined this method must never return NULL; instead it
363 should throw an exception on failure. The returned compiler
364 instance is owned by its caller and must be deallocated by
365 calling its 'destroy' method. */
367 struct compile_instance *(*la_get_compile_instance) (void);
369 /* This method must be defined if 'la_get_gcc_context' is defined.
370 If 'la_get_gcc_context' is not defined, then this method is
373 This takes the user-supplied text and returns a newly malloc'd
374 bit of code to compile. The caller owns the result.
376 INST is the compiler instance being used.
377 INPUT is the user's input text.
378 GDBARCH is the architecture to use.
379 EXPR_BLOCK is the block in which the expression is being
381 EXPR_PC is the PC at which the expression is being parsed. */
383 char *(*la_compute_program) (struct compile_instance *inst,
385 struct gdbarch *gdbarch,
386 const struct block *expr_block,
389 /* Add fields above this point, so the magic number is always last. */
390 /* Magic number for compat checking. */
396 #define LANG_MAGIC 910823L
398 /* Pointer to the language_defn for our current language. This pointer
399 always points to *some* valid struct; it can be used without checking
402 The current language affects expression parsing and evaluation
403 (FIXME: it might be cleaner to make the evaluation-related stuff
404 separate exp_opcodes for each different set of semantics. We
405 should at least think this through more clearly with respect to
406 what happens if the language is changed between parsing and
407 evaluation) and printing of things like types and arrays. It does
408 *not* affect symbol-reading-- each source file in a symbol-file has
409 its own language and we should keep track of that regardless of the
410 language when symbols are read. If we want some manual setting for
411 the language of symbol files (e.g. detecting when ".c" files are
412 C++), it should be a separate setting from the current_language. */
414 extern const struct language_defn *current_language;
416 /* Pointer to the language_defn expected by the user, e.g. the language
417 of main(), or the language we last mentioned in a message, or C. */
419 extern const struct language_defn *expected_language;
422 language_mode_auto: current_language automatically set upon selection
423 of scope (e.g. stack frame)
424 language_mode_manual: current_language set only by user. */
426 extern enum language_mode
428 language_mode_auto, language_mode_manual
432 struct type *language_bool_type (const struct language_defn *l,
433 struct gdbarch *gdbarch);
435 struct type *language_string_char_type (const struct language_defn *l,
436 struct gdbarch *gdbarch);
438 struct type *language_lookup_primitive_type (const struct language_defn *l,
439 struct gdbarch *gdbarch,
443 /* These macros define the behaviour of the expression
446 /* Should we range check values against the domain of their type? */
447 #define RANGE_CHECK (range_check != range_check_off)
449 /* "cast" really means conversion. */
450 /* FIXME -- should be a setting in language_defn. */
451 #define CAST_IS_CONVERSION(LANG) ((LANG)->la_language == language_c || \
452 (LANG)->la_language == language_cplus || \
453 (LANG)->la_language == language_objc)
455 extern void language_info (int);
457 extern enum language set_language (enum language);
460 /* This page contains functions that return things that are
461 specific to languages. Each of these functions is based on
462 the current setting of working_lang, which the user sets
463 with the "set language" command. */
465 #define LA_PRINT_TYPE(type,varstring,stream,show,level,flags) \
466 (current_language->la_print_type(type,varstring,stream,show,level,flags))
468 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \
469 (current_language->la_print_typedef(type,new_symbol,stream))
471 #define LA_VAL_PRINT(type,valaddr,offset,addr,stream,val,recurse,options) \
472 (current_language->la_val_print(type,valaddr,offset,addr,stream, \
473 val,recurse,options))
474 #define LA_VALUE_PRINT(val,stream,options) \
475 (current_language->la_value_print(val,stream,options))
477 #define LA_PRINT_CHAR(ch, type, stream) \
478 (current_language->la_printchar(ch, type, stream))
479 #define LA_PRINT_STRING(stream, elttype, string, length, encoding, force_ellipses, options) \
480 (current_language->la_printstr(stream, elttype, string, length, \
481 encoding, force_ellipses,options))
482 #define LA_EMIT_CHAR(ch, type, stream, quoter) \
483 (current_language->la_emitchar(ch, type, stream, quoter))
484 #define LA_GET_STRING(value, buffer, length, chartype, encoding) \
485 (current_language->la_get_string(value, buffer, length, chartype, encoding))
487 #define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \
488 (current_language->la_print_array_index(index_value, stream, options))
490 #define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK, DATA) \
491 (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK, \
494 /* Test a character to decide whether it can be printed in literal form
495 or needs to be printed in another representation. For example,
496 in C the literal form of the character with octal value 141 is 'a'
497 and the "other representation" is '\141'. The "other representation"
498 is program language dependent. */
500 #define PRINT_LITERAL_FORM(c) \
502 && ((c) < 0x7F || (c) >= 0xA0) \
503 && (!sevenbit_strings || (c) < 0x80))
505 /* Type predicates */
507 extern int pointer_type (struct type *);
511 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
513 /* Data: Does this value represent "truth" to the current language? */
515 extern int value_true (struct value *);
517 /* Misc: The string representing a particular enum language. */
519 extern enum language language_enum (char *str);
521 extern const struct language_defn *language_def (enum language);
523 extern const char *language_str (enum language);
525 /* Add a language to the set known by GDB (at initialization time). */
527 extern void add_language (const struct language_defn *);
529 extern enum language get_frame_language (void); /* In stack.c */
531 /* Check for a language-specific trampoline. */
533 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
535 /* Return demangled language symbol, or NULL. */
536 extern char *language_demangle (const struct language_defn *current_language,
537 const char *mangled, int options);
539 /* Return class name from physname, or NULL. */
540 extern char *language_class_name_from_physname (const struct language_defn *,
541 const char *physname);
543 /* Splitting strings into words. */
544 extern char *default_word_break_characters (void);
546 /* Print the index of an array element using the C99 syntax. */
547 extern void default_print_array_index (struct value *index_value,
548 struct ui_file *stream,
549 const struct value_print_options *options);
551 /* Return non-zero if TYPE should be passed (and returned) by
552 reference at the language level. */
553 int language_pass_by_reference (struct type *type);
555 /* Return zero; by default, types are passed by value at the language
556 level. The target ABI may pass or return some structs by reference
557 independent of this. */
558 int default_pass_by_reference (struct type *type);
560 /* The default implementation of la_print_typedef. */
561 void default_print_typedef (struct type *type, struct symbol *new_symbol,
562 struct ui_file *stream);
564 void default_get_string (struct value *value, gdb_byte **buffer, int *length,
565 struct type **char_type, const char **charset);
567 void c_get_string (struct value *value, gdb_byte **buffer, int *length,
568 struct type **char_type, const char **charset);
570 #endif /* defined (LANGUAGE_H) */