1 /* Source-language-related definitions for GDB.
3 Copyright (C) 1991-2013 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)
26 /* Forward decls for prototypes. */
32 struct value_print_options;
33 struct type_print_options;
34 struct lang_varobj_ops;
36 #define MAX_FORTRAN_DIMS 7 /* Maximum number of F77 array dims. */
39 range_mode_auto: range_check set automatically to default of language.
40 range_mode_manual: range_check set manually by user. */
42 extern enum range_mode
44 range_mode_auto, range_mode_manual
49 range_check_on: Ranges are checked in GDB expressions, producing errors.
50 range_check_warn: Ranges are checked, producing warnings.
51 range_check_off: Ranges are not checked in GDB expressions. */
53 extern enum range_check
55 range_check_off, range_check_warn, range_check_on
60 case_mode_auto: case_sensitivity set upon selection of scope.
61 case_mode_manual: case_sensitivity set only by user. */
65 case_mode_auto, case_mode_manual
70 array_row_major: Arrays are in row major order.
71 array_column_major: Arrays are in column major order. */
73 extern enum array_ordering
75 array_row_major, array_column_major
80 /* case_sensitivity ==
81 case_sensitive_on: Case sensitivity in name matching is used.
82 case_sensitive_off: Case sensitivity in name matching is not used. */
84 extern enum case_sensitivity
86 case_sensitive_on, case_sensitive_off
92 macro_expansion_no: No macro expansion is available.
93 macro_expansion_c: C-like macro expansion is available. */
97 macro_expansion_no, macro_expansion_c
101 /* Per architecture (OS/ABI) language information. */
103 struct language_arch_info
105 /* Its primitive types. This is a vector ended by a NULL pointer.
106 These types can be specified by name in parsing types in
107 expressions, regardless of whether the program being debugged
108 actually defines such a type. */
109 struct type **primitive_type_vector;
110 /* Type of elements of strings. */
111 struct type *string_char_type;
113 /* Symbol name of type to use as boolean type, if defined. */
114 const char *bool_type_symbol;
115 /* Otherwise, this is the default boolean builtin type. */
116 struct type *bool_type_default;
119 /* A pointer to a function expected to return nonzero if
120 SYMBOL_SEARCH_NAME matches the given LOOKUP_NAME.
122 SYMBOL_SEARCH_NAME should be a symbol's "search" name.
123 LOOKUP_NAME should be the name of an entity after it has been
124 transformed for lookup. */
126 typedef int (*symbol_name_cmp_ftype) (const char *symbol_search_name,
127 const char *lookup_name);
129 /* Structure tying together assorted information about a language. */
133 /* Name of the language. */
137 /* its symtab language-enum (defs.h). */
139 enum language la_language;
141 /* Default range checking. */
143 enum range_check la_range_check;
145 /* Default case sensitivity. */
146 enum case_sensitivity la_case_sensitivity;
148 /* Multi-dimensional array ordering. */
149 enum array_ordering la_array_ordering;
151 /* Style of macro expansion, if any, supported by this language. */
152 enum macro_expansion la_macro_expansion;
154 /* Definitions related to expression printing, prefixifying, and
157 const struct exp_descriptor *la_exp_desc;
159 /* Parser function. */
161 int (*la_parser) (void);
163 /* Parser error function. */
165 void (*la_error) (char *);
167 /* Given an expression *EXPP created by prefixifying the result of
168 la_parser, perform any remaining processing necessary to complete
169 its translation. *EXPP may change; la_post_parser is responsible
170 for releasing its previous contents, if necessary. If
171 VOID_CONTEXT_P, then no value is expected from the expression. */
173 void (*la_post_parser) (struct expression ** expp, int void_context_p);
175 void (*la_printchar) (int ch, struct type *chtype,
176 struct ui_file * stream);
178 void (*la_printstr) (struct ui_file * stream, struct type *elttype,
179 const gdb_byte *string, unsigned int length,
180 const char *encoding, int force_ellipses,
181 const struct value_print_options *);
183 void (*la_emitchar) (int ch, struct type *chtype,
184 struct ui_file * stream, int quoter);
186 /* Print a type using syntax appropriate for this language. */
188 void (*la_print_type) (struct type *, const char *, struct ui_file *, int,
189 int, const struct type_print_options *);
191 /* Print a typedef using syntax appropriate for this language.
192 TYPE is the underlying type. NEW_SYMBOL is the symbol naming
193 the type. STREAM is the output stream on which to print. */
195 void (*la_print_typedef) (struct type *type, struct symbol *new_symbol,
196 struct ui_file *stream);
198 /* Print a value using syntax appropriate for this language.
200 TYPE is the type of the sub-object to be printed.
202 CONTENTS holds the bits of the value. This holds the entire
205 EMBEDDED_OFFSET is the offset into the outermost object of the
206 sub-object represented by TYPE. This is the object which this
207 call should print. Note that the enclosing type is not
210 ADDRESS is the address in the inferior of the enclosing object.
212 STREAM is the stream on which the value is to be printed.
214 RECURSE is the recursion depth. It is zero-based.
216 OPTIONS are the formatting options to be used when
219 void (*la_val_print) (struct type *type,
220 const gdb_byte *contents,
221 int embedded_offset, CORE_ADDR address,
222 struct ui_file *stream, int recurse,
223 const struct value *val,
224 const struct value_print_options *options);
226 /* Print a top-level value using syntax appropriate for this language. */
228 void (*la_value_print) (struct value *, struct ui_file *,
229 const struct value_print_options *);
231 /* Given a symbol VAR, and a stack frame id FRAME, read the value
232 of the variable an return (pointer to a) struct value containing
235 Throw an error if the variable cannot be found. */
237 struct value *(*la_read_var_value) (struct symbol *var,
238 struct frame_info *frame);
240 /* PC is possibly an unknown languages trampoline.
241 If that PC falls in a trampoline belonging to this language,
242 return the address of the first pc in the real function, or 0
243 if it isn't a language tramp for this language. */
244 CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR);
246 /* Now come some hooks for lookup_symbol. */
248 /* If this is non-NULL, specifies the name that of the implicit
249 local variable that refers to the current object instance. */
251 char *la_name_of_this;
253 /* This is a function that lookup_symbol will call when it gets to
254 the part of symbol lookup where C looks up static and global
257 struct symbol *(*la_lookup_symbol_nonlocal) (const char *,
258 const struct block *,
261 /* Find the definition of the type with the given name. */
262 struct type *(*la_lookup_transparent_type) (const char *);
264 /* Return demangled language symbol, or NULL. */
265 char *(*la_demangle) (const char *mangled, int options);
267 /* Return class name of a mangled method name or NULL. */
268 char *(*la_class_name_from_physname) (const char *physname);
270 /* Table for printing expressions. */
272 const struct op_print *la_op_print_tab;
274 /* Zero if the language has first-class arrays. True if there are no
275 array values, and array objects decay to pointers, as in C. */
279 /* Index to use for extracting the first element of a string. */
280 char string_lower_bound;
282 /* The list of characters forming word boundaries. */
283 char *(*la_word_break_characters) (void);
285 /* Should return a vector of all symbols which are possible
286 completions for TEXT. WORD is the entire command on which the
287 completion is being made. If CODE is TYPE_CODE_UNDEF, then all
288 symbols should be examined; otherwise, only STRUCT_DOMAIN
289 symbols whose type has a code of CODE should be matched. */
290 VEC (char_ptr) *(*la_make_symbol_completion_list) (const char *text,
292 enum type_code code);
294 /* The per-architecture (OS/ABI) language information. */
295 void (*la_language_arch_info) (struct gdbarch *,
296 struct language_arch_info *);
298 /* Print the index of an element of an array. */
299 void (*la_print_array_index) (struct value *index_value,
300 struct ui_file *stream,
301 const struct value_print_options *options);
303 /* Return non-zero if TYPE should be passed (and returned) by
304 reference at the language level. */
305 int (*la_pass_by_reference) (struct type *type);
307 /* Obtain a string from the inferior, storing it in a newly allocated
308 buffer in BUFFER, which should be freed by the caller. If the
309 in- and out-parameter *LENGTH is specified at -1, the string is
310 read until a null character of the appropriate width is found -
311 otherwise the string is read to the length of characters specified.
312 On completion, *LENGTH will hold the size of the string in characters.
313 If a *LENGTH of -1 was specified it will count only actual
314 characters, excluding any eventual terminating null character.
315 Otherwise *LENGTH will include all characters - including any nulls.
316 CHARSET will hold the encoding used in the string. */
317 void (*la_get_string) (struct value *value, gdb_byte **buffer, int *length,
318 struct type **chartype, const char **charset);
320 /* Return a pointer to the function that should be used to match
321 a symbol name against LOOKUP_NAME. This is mostly for languages
322 such as Ada where the matching algorithm depends on LOOKUP_NAME.
324 This field may be NULL, in which case strcmp_iw will be used
325 to perform the matching. */
326 symbol_name_cmp_ftype (*la_get_symbol_name_cmp) (const char *lookup_name);
328 /* Find all symbols in the current program space matching NAME in
329 DOMAIN, according to this language's rules.
331 The search is done in BLOCK only.
332 The caller is responsible for iterating up through superblocks
335 For each one, call CALLBACK with the symbol and the DATA
336 argument. If CALLBACK returns zero, the iteration ends at that
339 This field may not be NULL. If the language does not need any
340 special processing here, 'iterate_over_symbols' should be
341 used as the definition. */
342 void (*la_iterate_over_symbols) (const struct block *block,
345 symbol_found_callback_ftype *callback,
348 /* Various operations on varobj. */
349 const struct lang_varobj_ops *la_varobj_ops;
351 /* Add fields above this point, so the magic number is always last. */
352 /* Magic number for compat checking. */
358 #define LANG_MAGIC 910823L
360 /* Pointer to the language_defn for our current language. This pointer
361 always points to *some* valid struct; it can be used without checking
364 The current language affects expression parsing and evaluation
365 (FIXME: it might be cleaner to make the evaluation-related stuff
366 separate exp_opcodes for each different set of semantics. We
367 should at least think this through more clearly with respect to
368 what happens if the language is changed between parsing and
369 evaluation) and printing of things like types and arrays. It does
370 *not* affect symbol-reading-- each source file in a symbol-file has
371 its own language and we should keep track of that regardless of the
372 language when symbols are read. If we want some manual setting for
373 the language of symbol files (e.g. detecting when ".c" files are
374 C++), it should be a separate setting from the current_language. */
376 extern const struct language_defn *current_language;
378 /* Pointer to the language_defn expected by the user, e.g. the language
379 of main(), or the language we last mentioned in a message, or C. */
381 extern const struct language_defn *expected_language;
384 language_mode_auto: current_language automatically set upon selection
385 of scope (e.g. stack frame)
386 language_mode_manual: current_language set only by user. */
388 extern enum language_mode
390 language_mode_auto, language_mode_manual
394 struct type *language_bool_type (const struct language_defn *l,
395 struct gdbarch *gdbarch);
397 struct type *language_string_char_type (const struct language_defn *l,
398 struct gdbarch *gdbarch);
400 struct type *language_lookup_primitive_type_by_name (const struct language_defn *l,
401 struct gdbarch *gdbarch,
405 /* These macros define the behaviour of the expression
408 /* Should we range check values against the domain of their type? */
409 #define RANGE_CHECK (range_check != range_check_off)
411 /* "cast" really means conversion. */
412 /* FIXME -- should be a setting in language_defn. */
413 #define CAST_IS_CONVERSION(LANG) ((LANG)->la_language == language_c || \
414 (LANG)->la_language == language_cplus || \
415 (LANG)->la_language == language_objc)
417 extern void language_info (int);
419 extern enum language set_language (enum language);
422 /* This page contains functions that return things that are
423 specific to languages. Each of these functions is based on
424 the current setting of working_lang, which the user sets
425 with the "set language" command. */
427 #define LA_PRINT_TYPE(type,varstring,stream,show,level,flags) \
428 (current_language->la_print_type(type,varstring,stream,show,level,flags))
430 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \
431 (current_language->la_print_typedef(type,new_symbol,stream))
433 #define LA_VAL_PRINT(type,valaddr,offset,addr,stream,val,recurse,options) \
434 (current_language->la_val_print(type,valaddr,offset,addr,stream, \
435 val,recurse,options))
436 #define LA_VALUE_PRINT(val,stream,options) \
437 (current_language->la_value_print(val,stream,options))
439 #define LA_PRINT_CHAR(ch, type, stream) \
440 (current_language->la_printchar(ch, type, stream))
441 #define LA_PRINT_STRING(stream, elttype, string, length, encoding, force_ellipses, options) \
442 (current_language->la_printstr(stream, elttype, string, length, \
443 encoding, force_ellipses,options))
444 #define LA_EMIT_CHAR(ch, type, stream, quoter) \
445 (current_language->la_emitchar(ch, type, stream, quoter))
446 #define LA_GET_STRING(value, buffer, length, chartype, encoding) \
447 (current_language->la_get_string(value, buffer, length, chartype, encoding))
449 #define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \
450 (current_language->la_print_array_index(index_value, stream, options))
452 #define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK, DATA) \
453 (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK, \
456 /* Test a character to decide whether it can be printed in literal form
457 or needs to be printed in another representation. For example,
458 in C the literal form of the character with octal value 141 is 'a'
459 and the "other representation" is '\141'. The "other representation"
460 is program language dependent. */
462 #define PRINT_LITERAL_FORM(c) \
464 && ((c) < 0x7F || (c) >= 0xA0) \
465 && (!sevenbit_strings || (c) < 0x80))
467 /* Type predicates */
469 extern int pointer_type (struct type *);
471 /* Checks Binary and Unary operations for semantic type correctness. */
472 /* FIXME: Does not appear to be used. */
473 #define unop_type_check(v,o) binop_type_check((v),NULL,(o))
475 extern void binop_type_check (struct value *, struct value *, int);
479 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
481 /* Data: Does this value represent "truth" to the current language? */
483 extern int value_true (struct value *);
485 /* Misc: The string representing a particular enum language. */
487 extern enum language language_enum (char *str);
489 extern const struct language_defn *language_def (enum language);
491 extern const char *language_str (enum language);
493 /* Add a language to the set known by GDB (at initialization time). */
495 extern void add_language (const struct language_defn *);
497 extern enum language get_frame_language (void); /* In stack.c */
499 /* Check for a language-specific trampoline. */
501 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
503 /* Return demangled language symbol, or NULL. */
504 extern char *language_demangle (const struct language_defn *current_language,
505 const char *mangled, int options);
507 /* Return class name from physname, or NULL. */
508 extern char *language_class_name_from_physname (const struct language_defn *,
509 const char *physname);
511 /* Splitting strings into words. */
512 extern char *default_word_break_characters (void);
514 /* Print the index of an array element using the C99 syntax. */
515 extern void default_print_array_index (struct value *index_value,
516 struct ui_file *stream,
517 const struct value_print_options *options);
519 /* Return non-zero if TYPE should be passed (and returned) by
520 reference at the language level. */
521 int language_pass_by_reference (struct type *type);
523 /* Return zero; by default, types are passed by value at the language
524 level. The target ABI may pass or return some structs by reference
525 independent of this. */
526 int default_pass_by_reference (struct type *type);
528 /* The default implementation of la_print_typedef. */
529 void default_print_typedef (struct type *type, struct symbol *new_symbol,
530 struct ui_file *stream);
532 void default_get_string (struct value *value, gdb_byte **buffer, int *length,
533 struct type **char_type, const char **charset);
535 void c_get_string (struct value *value, gdb_byte **buffer, int *length,
536 struct type **char_type, const char **charset);
538 #endif /* defined (LANGUAGE_H) */