GDB (xrefs)

/tmp/gdb-8.1/gdb/language.h
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1 /* Source-language-related definitions for GDB.
2
3 Copyright (C) 1991-2018 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 struct 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 /* Parser error function. */
176
177 void (*la_error) (const char *);
178
179 /* Given an expression *EXPP created by prefixifying the result of
180 la_parser, perform any remaining processing necessary to complete
181 its translation. *EXPP may change; la_post_parser is responsible
182 for releasing its previous contents, if necessary. If
183 VOID_CONTEXT_P, then no value is expected from the expression. */
184
185 void (*la_post_parser) (expression_up *expp, int void_context_p);
186
187 void (*la_printchar) (int ch, struct type *chtype,
188 struct ui_file * stream);
189
190 void (*la_printstr) (struct ui_file * stream, struct type *elttype,
191 const gdb_byte *string, unsigned int length,
192 const char *encoding, int force_ellipses,
193 const struct value_print_options *);
194
195 void (*la_emitchar) (int ch, struct type *chtype,
196 struct ui_file * stream, int quoter);
197
198 /* Print a type using syntax appropriate for this language. */
199
200 void (*la_print_type) (struct type *, const char *, struct ui_file *, int,
201 int, const struct type_print_options *);
202
203 /* Print a typedef using syntax appropriate for this language.
204 TYPE is the underlying type. NEW_SYMBOL is the symbol naming
205 the type. STREAM is the output stream on which to print. */
206
207 void (*la_print_typedef) (struct type *type, struct symbol *new_symbol,
208 struct ui_file *stream);
209
210 /* Print a value using syntax appropriate for this language.
211
212 TYPE is the type of the sub-object to be printed.
213
214 EMBEDDED_OFFSET is the offset into the outermost object of the
215 sub-object represented by TYPE. This is the object which this
216 call should print. Note that the enclosing type is not
217 available.
218
219 ADDRESS is the address in the inferior of the enclosing object.
220
221 STREAM is the stream on which the value is to be printed.
222
223 RECURSE is the recursion depth. It is zero-based.
224
225 OPTIONS are the formatting options to be used when
226 printing. */
227
228 void (*la_val_print) (struct type *type,
229 int embedded_offset, CORE_ADDR address,
230 struct ui_file *stream, int recurse,
231 struct value *val,
232 const struct value_print_options *options);
233
234 /* Print a top-level value using syntax appropriate for this language. */
235
236 void (*la_value_print) (struct value *, struct ui_file *,
237 const struct value_print_options *);
238
239 /* Given a symbol VAR, the corresponding block VAR_BLOCK (if any) and a
240 stack frame id FRAME, read the value of the variable and return (pointer
241 to a) struct value containing the value.
242
243 VAR_BLOCK is needed if there's a possibility for VAR to be outside
244 FRAME. This is what happens if FRAME correspond to a nested function
245 and VAR is defined in the outer function. If callers know that VAR is
246 located in FRAME or is global/static, NULL can be passed as VAR_BLOCK.
247
248 Throw an error if the variable cannot be found. */
249
250 struct value *(*la_read_var_value) (struct symbol *var,
251 const struct block *var_block,
252 struct frame_info *frame);
253
254 /* PC is possibly an unknown languages trampoline.
255 If that PC falls in a trampoline belonging to this language,
256 return the address of the first pc in the real function, or 0
257 if it isn't a language tramp for this language. */
258 CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR);
259
260 /* Now come some hooks for lookup_symbol. */
261
262 /* If this is non-NULL, specifies the name that of the implicit
263 local variable that refers to the current object instance. */
264
265 const char *la_name_of_this;
266
267 /* This is a function that lookup_symbol will call when it gets to
268 the part of symbol lookup where C looks up static and global
269 variables. */
270
271 struct block_symbol (*la_lookup_symbol_nonlocal)
272 (const struct language_defn *,
273 const char *,
274 const struct block *,
275 const domain_enum);
276
277 /* Find the definition of the type with the given name. */
278 struct type *(*la_lookup_transparent_type) (const char *);
279
280 /* Return demangled language symbol, or NULL. */
281 char *(*la_demangle) (const char *mangled, int options);
282
283 /* Demangle a symbol according to this language's rules. Unlike
284 la_demangle, this does not take any options.
285
286 *DEMANGLED will be set by this function.
287
288 If this function returns 0, then *DEMANGLED must always be set
289 to NULL.
290
291 If this function returns 1, the implementation may set this to
292 a xmalloc'd string holding the demangled form. However, it is
293 not required to. The string, if any, is owned by the caller.
294
295 The resulting string should be of the form that will be
296 installed into a symbol. */
297 int (*la_sniff_from_mangled_name) (const char *mangled, char **demangled);
298
299 /* Return class name of a mangled method name or NULL. */
300 char *(*la_class_name_from_physname) (const char *physname);
301
302 /* Table for printing expressions. */
303
304 const struct op_print *la_op_print_tab;
305
306 /* Zero if the language has first-class arrays. True if there are no
307 array values, and array objects decay to pointers, as in C. */
308
309 char c_style_arrays;
310
311 /* Index to use for extracting the first element of a string. */
312 char string_lower_bound;
313
314 /* The list of characters forming word boundaries. */
315 const char *(*la_word_break_characters) (void);
316
317 /* Add to the completion tracker all symbols which are possible
318 completions for TEXT. WORD is the entire command on which the
319 completion is being made. If CODE is TYPE_CODE_UNDEF, then all
320 symbols should be examined; otherwise, only STRUCT_DOMAIN
321 symbols whose type has a code of CODE should be matched. */
322 void (*la_collect_symbol_completion_matches)
323 (completion_tracker &tracker,
324 complete_symbol_mode mode,
325 symbol_name_match_type match_type,
326 const char *text,
327 const char *word,
328 enum type_code code);
329
330 /* The per-architecture (OS/ABI) language information. */
331 void (*la_language_arch_info) (struct gdbarch *,
332 struct language_arch_info *);
333
334 /* Print the index of an element of an array. */
335 void (*la_print_array_index) (struct value *index_value,
336 struct ui_file *stream,
337 const struct value_print_options *options);
338
339 /* Return non-zero if TYPE should be passed (and returned) by
340 reference at the language level. */
341 int (*la_pass_by_reference) (struct type *type);
342
343 /* Obtain a string from the inferior, storing it in a newly allocated
344 buffer in BUFFER, which should be freed by the caller. If the
345 in- and out-parameter *LENGTH is specified at -1, the string is
346 read until a null character of the appropriate width is found -
347 otherwise the string is read to the length of characters specified.
348 On completion, *LENGTH will hold the size of the string in characters.
349 If a *LENGTH of -1 was specified it will count only actual
350 characters, excluding any eventual terminating null character.
351 Otherwise *LENGTH will include all characters - including any nulls.
352 CHARSET will hold the encoding used in the string. */
353 void (*la_get_string) (struct value *value, gdb_byte **buffer, int *length,
354 struct type **chartype, const char **charset);
355
356 /* Return an expression that can be used for a location
357 watchpoint. TYPE is a pointer type that points to the memory
358 to watch, and ADDR is the address of the watched memory. */
359 gdb::unique_xmalloc_ptr<char> (*la_watch_location_expression)
360 (struct type *type, CORE_ADDR addr);
361
362 /* Return a pointer to the function that should be used to match a
363 symbol name against LOOKUP_NAME, according to this language's
364 rules. The matching algorithm depends on LOOKUP_NAME. For
365 example, on Ada, the matching algorithm depends on the symbol
366 name (wild/full/verbatim matching), and on whether we're doing
367 a normal lookup or a completion match lookup.
368
369 This field may be NULL, in which case
370 default_symbol_name_matcher is used to perform the
371 matching. */
372 symbol_name_matcher_ftype *(*la_get_symbol_name_matcher)
373 (const lookup_name_info &);
374
375 /* Find all symbols in the current program space matching NAME in
376 DOMAIN, according to this language's rules.
377
378 The search is done in BLOCK only.
379 The caller is responsible for iterating up through superblocks
380 if desired.
381
382 For each one, call CALLBACK with the symbol. If CALLBACK
383 returns false, the iteration ends at that point.
384
385 This field may not be NULL. If the language does not need any
386 special processing here, 'iterate_over_symbols' should be
387 used as the definition. */
388 void (*la_iterate_over_symbols)
389 (const struct block *block, const lookup_name_info &name,
390 domain_enum domain,
391 gdb::function_view<symbol_found_callback_ftype> callback);
392
393 /* Hash the given symbol search name. Use
394 default_search_name_hash if no special treatment is
395 required. */
396 unsigned int (*la_search_name_hash) (const char *name);
397
398 /* Various operations on varobj. */
399 const struct lang_varobj_ops *la_varobj_ops;
400
401 /* If this language allows compilation from the gdb command line,
402 this method should be non-NULL. When called it should return
403 an instance of struct gcc_context appropriate to the language.
404 When defined this method must never return NULL; instead it
405 should throw an exception on failure. The returned compiler
406 instance is owned by its caller and must be deallocated by
407 calling its 'destroy' method. */
408
409 struct compile_instance *(*la_get_compile_instance) (void);
410
411 /* This method must be defined if 'la_get_gcc_context' is defined.
412 If 'la_get_gcc_context' is not defined, then this method is
413 ignored.
414
415 This takes the user-supplied text and returns a new bit of code
416 to compile.
417
418 INST is the compiler instance being used.
419 INPUT is the user's input text.
420 GDBARCH is the architecture to use.
421 EXPR_BLOCK is the block in which the expression is being
422 parsed.
423 EXPR_PC is the PC at which the expression is being parsed. */
424
425 std::string (*la_compute_program) (struct compile_instance *inst,
426 const char *input,
427 struct gdbarch *gdbarch,
428 const struct block *expr_block,
429 CORE_ADDR expr_pc);
430
431 /* Add fields above this point, so the magic number is always last. */
432 /* Magic number for compat checking. */
433
434 long la_magic;
435
436 };
437
438 #define LANG_MAGIC 910823L
439
440 /* Pointer to the language_defn for our current language. This pointer
441 always points to *some* valid struct; it can be used without checking
442 it for validity.
443
444 The current language affects expression parsing and evaluation
445 (FIXME: it might be cleaner to make the evaluation-related stuff
446 separate exp_opcodes for each different set of semantics. We
447 should at least think this through more clearly with respect to
448 what happens if the language is changed between parsing and
449 evaluation) and printing of things like types and arrays. It does
450 *not* affect symbol-reading-- each source file in a symbol-file has
451 its own language and we should keep track of that regardless of the
452 language when symbols are read. If we want some manual setting for
453 the language of symbol files (e.g. detecting when ".c" files are
454 C++), it should be a separate setting from the current_language. */
455
456 extern const struct language_defn *current_language;
457
458 /* Pointer to the language_defn expected by the user, e.g. the language
459 of main(), or the language we last mentioned in a message, or C. */
460
461 extern const struct language_defn *expected_language;
462
463 /* language_mode ==
464 language_mode_auto: current_language automatically set upon selection
465 of scope (e.g. stack frame)
466 language_mode_manual: current_language set only by user. */
467
468 extern enum language_mode
469 {
470 language_mode_auto, language_mode_manual
471 }
472 language_mode;
473
474 struct type *language_bool_type (const struct language_defn *l,
475 struct gdbarch *gdbarch);
476
477 struct type *language_string_char_type (const struct language_defn *l,
478 struct gdbarch *gdbarch);
479
480 /* Look up type NAME in language L, and return its definition for architecture
481 GDBARCH. Returns NULL if not found. */
482
483 struct type *language_lookup_primitive_type (const struct language_defn *l,
484 struct gdbarch *gdbarch,
485 const char *name);
486
487 /* Wrapper around language_lookup_primitive_type to return the
488 corresponding symbol. */
489
490 struct symbol *
491 language_lookup_primitive_type_as_symbol (const struct language_defn *l,
492 struct gdbarch *gdbarch,
493 const char *name);
494
495
496 /* These macros define the behaviour of the expression
497 evaluator. */
498
499 /* Should we range check values against the domain of their type? */
500 #define RANGE_CHECK (range_check != range_check_off)
501
502 /* "cast" really means conversion. */
503 /* FIXME -- should be a setting in language_defn. */
504 #define CAST_IS_CONVERSION(LANG) ((LANG)->la_language == language_c || \
505 (LANG)->la_language == language_cplus || \
506 (LANG)->la_language == language_objc)
507
508 extern void language_info (int);
509
510 extern enum language set_language (enum language);
511
512
513 /* This page contains functions that return things that are
514 specific to languages. Each of these functions is based on
515 the current setting of working_lang, which the user sets
516 with the "set language" command. */
517
518 #define LA_PRINT_TYPE(type,varstring,stream,show,level,flags) \
519 (current_language->la_print_type(type,varstring,stream,show,level,flags))
520
521 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \
522 (current_language->la_print_typedef(type,new_symbol,stream))
523
524 #define LA_VALUE_PRINT(val,stream,options) \
525 (current_language->la_value_print(val,stream,options))
526
527 #define LA_PRINT_CHAR(ch, type, stream) \
528 (current_language->la_printchar(ch, type, stream))
529 #define LA_PRINT_STRING(stream, elttype, string, length, encoding, force_ellipses, options) \
530 (current_language->la_printstr(stream, elttype, string, length, \
531 encoding, force_ellipses,options))
532 #define LA_EMIT_CHAR(ch, type, stream, quoter) \
533 (current_language->la_emitchar(ch, type, stream, quoter))
534 #define LA_GET_STRING(value, buffer, length, chartype, encoding) \
535 (current_language->la_get_string(value, buffer, length, chartype, encoding))
536
537 #define LA_PRINT_ARRAY_INDEX(index_value, stream, options) \
538 (current_language->la_print_array_index(index_value, stream, options))
539
540 #define LA_ITERATE_OVER_SYMBOLS(BLOCK, NAME, DOMAIN, CALLBACK) \
541 (current_language->la_iterate_over_symbols (BLOCK, NAME, DOMAIN, CALLBACK))
542
543 /* Test a character to decide whether it can be printed in literal form
544 or needs to be printed in another representation. For example,
545 in C the literal form of the character with octal value 141 is 'a'
546 and the "other representation" is '\141'. The "other representation"
547 is program language dependent. */
548
549 #define PRINT_LITERAL_FORM(c) \
550 ((c) >= 0x20 \
551 && ((c) < 0x7F || (c) >= 0xA0) \
552 && (!sevenbit_strings || (c) < 0x80))
553
554 /* Type predicates */
555
556 extern int pointer_type (struct type *);
557
558 /* Error messages */
559
560 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
561
562 /* Data: Does this value represent "truth" to the current language? */
563
564 extern int value_true (struct value *);
565
566 /* Misc: The string representing a particular enum language. */
567
568 extern enum language language_enum (const char *str);
569
570 extern const struct language_defn *language_def (enum language);
571
572 extern const char *language_str (enum language);
573
574 /* Check for a language-specific trampoline. */
575
576 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
577
578 /* Return demangled language symbol, or NULL. */
579 extern char *language_demangle (const struct language_defn *current_language,
580 const char *mangled, int options);
581
582 /* A wrapper for la_sniff_from_mangled_name. The arguments and result
583 are as for the method. */
584
585 extern int language_sniff_from_mangled_name (const struct language_defn *lang,
586 const char *mangled,
587 char **demangled);
588
589 /* Return class name from physname, or NULL. */
590 extern char *language_class_name_from_physname (const struct language_defn *,
591 const char *physname);
592
593 /* Splitting strings into words. */
594 extern const char *default_word_break_characters (void);
595
596 /* Print the index of an array element using the C99 syntax. */
597 extern void default_print_array_index (struct value *index_value,
598 struct ui_file *stream,
599 const struct value_print_options *options);
600
601 /* Return non-zero if TYPE should be passed (and returned) by
602 reference at the language level. */
603 int language_pass_by_reference (struct type *type);
604
605 /* Return zero; by default, types are passed by value at the language
606 level. The target ABI may pass or return some structs by reference
607 independent of this. */
608 int default_pass_by_reference (struct type *type);
609
610 /* The default implementation of la_print_typedef. */
611 void default_print_typedef (struct type *type, struct symbol *new_symbol,
612 struct ui_file *stream);
613
614 void default_get_string (struct value *value, gdb_byte **buffer, int *length,
615 struct type **char_type, const char **charset);
616
617 /* Default name hashing function. */
618
619 /* Produce an unsigned hash value from SEARCH_NAME that is consistent
620 with strcmp_iw, strcmp, and, at least on Ada symbols, wild_match.
621 That is, two identifiers equivalent according to any of those three
622 comparison operators hash to the same value. */
623 extern unsigned int default_search_name_hash (const char *search_name);
624
625 void c_get_string (struct value *value, gdb_byte **buffer, int *length,
626 struct type **char_type, const char **charset);
627
628 /* The default implementation of la_symbol_name_matcher. Matches with
629 strncmp_iw. */
630 extern bool default_symbol_name_matcher
631 (const char *symbol_search_name,
632 const lookup_name_info &lookup_name,
633 completion_match_result *comp_match_res);
634
635 /* Get LANG's symbol_name_matcher method for LOOKUP_NAME. Returns
636 default_symbol_name_matcher if not set. LANG is used as a hint;
637 the function may ignore it depending on the current language and
638 LOOKUP_NAME. Specifically, if the current language is Ada, this
639 may return an Ada matcher regardless of LANG. */
640 symbol_name_matcher_ftype *get_symbol_name_matcher
641 (const language_defn *lang, const lookup_name_info &lookup_name);
642
643 /* The languages supported by GDB. */
644
645 extern const struct language_defn auto_language_defn;
646 extern const struct language_defn unknown_language_defn;
647 extern const struct language_defn minimal_language_defn;
648
649 extern const struct language_defn ada_language_defn;
650 extern const struct language_defn asm_language_defn;
651 extern const struct language_defn c_language_defn;
652 extern const struct language_defn cplus_language_defn;
653 extern const struct language_defn d_language_defn;
654 extern const struct language_defn f_language_defn;
655 extern const struct language_defn go_language_defn;
656 extern const struct language_defn m2_language_defn;
657 extern const struct language_defn objc_language_defn;
658 extern const struct language_defn opencl_language_defn;
659 extern const struct language_defn pascal_language_defn;
660 extern const struct language_defn rust_language_defn;
661
662 /* Save the current language and restore it upon destruction. */
663
664 class scoped_restore_current_language
665 {
666 public:
667
668 explicit scoped_restore_current_language ()
669 : m_lang (current_language->la_language)
670 {
671 }
672
673 ~scoped_restore_current_language ()
674 {
675 set_language (m_lang);
676 }
677
678 scoped_restore_current_language (const scoped_restore_current_language &)
679 = delete;
680 scoped_restore_current_language &operator=
681 (const scoped_restore_current_language &) = delete;
682
683 private:
684
685 enum language m_lang;
686 };
687
688 #endif /* defined (LANGUAGE_H) */
gdbarch
Definition: gdbarch.c:127
type::length
unsigned int length
Definition: gdbtypes.h:803
string
const char * string
Definition: signals.c:50
scoped_restore_current_language::scoped_restore_current_language
scoped_restore_current_language()
Definition: language.h:668
rust_language_defn
const struct language_defn rust_language_defn
range_check_on
Definition: language.h:61
type_code
type_code
Definition: gdbtypes.h:80
language_lookup_primitive_type_as_symbol
struct symbol * language_lookup_primitive_type_as_symbol(const struct language_defn *l, struct gdbarch *gdbarch, const char *name)
Definition: language.c:1099
language_defn::string_lower_bound
char string_lower_bound
Definition: language.h:312
exp_descriptor
Definition: parser-defs.h:320
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