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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [value.h] - Blame information for rev 1765

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1 104 markom
/* Definitions for values of C expressions, for GDB.
2
   Copyright 1986, 1987, 1989, 1992-1996, 2000 Free Software Foundation, Inc.
3
 
4
   This file is part of GDB.
5
 
6
   This program is free software; you can redistribute it and/or modify
7
   it under the terms of the GNU General Public License as published by
8
   the Free Software Foundation; either version 2 of the License, or
9
   (at your option) any later version.
10
 
11
   This program is distributed in the hope that it will be useful,
12
   but WITHOUT ANY WARRANTY; without even the implied warranty of
13
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
   GNU General Public License for more details.
15
 
16
   You should have received a copy of the GNU General Public License
17
   along with this program; if not, write to the Free Software
18
   Foundation, Inc., 59 Temple Place - Suite 330,
19
   Boston, MA 02111-1307, USA.  */
20
 
21
#if !defined (VALUE_H)
22
#define VALUE_H 1
23
 
24
/*
25
 * The structure which defines the type of a value.  It should never
26
 * be possible for a program lval value to survive over a call to the inferior
27
 * (ie to be put into the history list or an internal variable).
28
 */
29
 
30
struct value
31
  {
32
    /* Type of value; either not an lval, or one of the various
33
       different possible kinds of lval.  */
34
    enum lval_type lval;
35
    /* Is it modifiable?  Only relevant if lval != not_lval.  */
36
    int modifiable;
37
    /* Location of value (if lval).  */
38
    union
39
      {
40
        /* If lval == lval_memory, this is the address in the inferior.
41
           If lval == lval_register, this is the byte offset into the
42
           registers structure.  */
43
        CORE_ADDR address;
44
        /* Pointer to internal variable.  */
45
        struct internalvar *internalvar;
46
        /* Number of register.  Only used with
47
           lval_reg_frame_relative.  */
48
        int regnum;
49
      }
50
    location;
51
    /* Describes offset of a value within lval of a structure in bytes.
52
       If lval == lval_memory, this is an offset to the address.
53
       If lval == lval_register, this is a further offset from
54
          location.address within the registers structure.
55
       Note also the member embedded_offset below.  */
56
    int offset;
57
    /* Only used for bitfields; number of bits contained in them.  */
58
    int bitsize;
59
    /* Only used for bitfields; position of start of field.
60
       For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
61
       For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
62
    int bitpos;
63
    /* Frame value is relative to.  In practice, this address is only
64
       used if the value is stored in several registers in other than
65
       the current frame, and these registers have not all been saved
66
       at the same place in memory.  This will be described in the
67
       lval enum above as "lval_reg_frame_relative".  */
68
    CORE_ADDR frame_addr;
69
    /* Type of the value.  */
70
    struct type *type;
71
    /* Type of the enclosing object if this is an embedded subobject.
72
       The member embedded_offset gives the real position of the subobject
73
       if type is not the same as enclosing_type.
74
 
75
       If the type field is a pointer type, then enclosing_type is
76
       a pointer type pointing to the real (enclosing) type of the target
77
       object. */
78
    struct type *enclosing_type;
79
    /* Values are stored in a chain, so that they can be deleted
80
       easily over calls to the inferior.  Values assigned to internal
81
       variables or put into the value history are taken off this
82
       list.  */
83
    struct value *next;
84
 
85
    /* ??? When is this used?  */
86
    union
87
      {
88
        CORE_ADDR memaddr;
89
        char *myaddr;
90
      }
91
    substring_addr;
92
 
93
    /* Register number if the value is from a register.  Is not kept
94
       if you take a field of a structure that is stored in a
95
       register.  Shouldn't it be?  */
96
    short regno;
97
    /* If zero, contents of this value are in the contents field.
98
       If nonzero, contents are in inferior memory at address
99
       in the location.address field plus the offset field
100
       (and the lval field should be lval_memory).  */
101
    char lazy;
102
    /* If nonzero, this is the value of a variable which does not
103
       actually exist in the program.  */
104
    char optimized_out;
105
    /* If this value represents an object that is embedded inside a
106
       larger object (e.g., a base subobject in C++), this gives the
107
       offset (in bytes) from the start of the contents buffer where
108
       the embedded object begins. This is required because some C++
109
       runtime implementations lay out objects (especially virtual bases
110
       with possibly negative offsets to ancestors).
111
       Note: This may be positive or negative! Also note that this offset
112
       is not used when retrieving contents from target memory; the entire
113
       enclosing object has to be retrieved always, and the offset for
114
       that is given by the member offset above. */
115
    int embedded_offset;
116
    /* If this value represents a pointer to an object that is embedded
117
       in another object, this gives the embedded_offset of the object
118
       that is pointed to. */
119
    int pointed_to_offset;
120
    /* The BFD section associated with this value.  */
121
    asection *bfd_section;
122
    /* Actual contents of the value.  For use of this value; setting
123
       it uses the stuff above.  Not valid if lazy is nonzero.
124
       Target byte-order.  We force it to be aligned properly for any
125
       possible value.  Note that a value therefore extends beyond
126
       what is declared here.  */
127
    union
128
      {
129
        long contents[1];
130
        double force_double_align;
131
        LONGEST force_longlong_align;
132
        char *literal_data;
133
      }
134
    aligner;
135
    /* Do not add any new members here -- contents above will trash them */
136
  };
137
 
138
typedef struct value *value_ptr;
139
 
140
#define VALUE_TYPE(val) (val)->type
141
#define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
142
#define VALUE_LAZY(val) (val)->lazy
143
/* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
144
   the gdb buffer used to hold a copy of the contents of the lval.
145
   VALUE_CONTENTS is used when the contents of the buffer are needed --
146
   it uses value_fetch_lazy() to load the buffer from the process being
147
   debugged if it hasn't already been loaded.  VALUE_CONTENTS_RAW is
148
   used when data is being stored into the buffer, or when it is
149
   certain that the contents of the buffer are valid.
150
   Note: The contents pointer is adjusted by the offset required to
151
   get to the real subobject, if the value happens to represent
152
   something embedded in a larger run-time object. */
153
 
154
#define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
155
#define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
156
                             VALUE_CONTENTS_RAW(val))
157
 
158
/* The ALL variants of the above two macros do not adjust the returned
159
   pointer by the embedded_offset value. */
160
 
161
#define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
162
#define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
163
                                 VALUE_CONTENTS_ALL_RAW(val))
164
 
165
 
166
extern int value_fetch_lazy PARAMS ((value_ptr val));
167
 
168
#define VALUE_LVAL(val) (val)->lval
169
#define VALUE_ADDRESS(val) (val)->location.address
170
#define VALUE_INTERNALVAR(val) (val)->location.internalvar
171
#define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
172
#define VALUE_FRAME(val) ((val)->frame_addr)
173
#define VALUE_OFFSET(val) (val)->offset
174
#define VALUE_BITSIZE(val) (val)->bitsize
175
#define VALUE_BITPOS(val) (val)->bitpos
176
#define VALUE_NEXT(val) (val)->next
177
#define VALUE_REGNO(val) (val)->regno
178
#define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
179
#define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
180
#define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
181
#define VALUE_BFD_SECTION(val) ((val)->bfd_section)
182
 
183
/* Convert a REF to the object referenced. */
184
 
185
#define COERCE_REF(arg)    \
186
do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
187
     if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF)               \
188
         arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp),    \
189
                              unpack_long (VALUE_TYPE (arg),            \
190
                                           VALUE_CONTENTS (arg)),       \
191
                              VALUE_BFD_SECTION (arg));                 \
192
    } while (0)
193
 
194
/* If ARG is an array, convert it to a pointer.
195
   If ARG is an enum, convert it to an integer.
196
   If ARG is a function, convert it to a function pointer.
197
 
198
   References are dereferenced.  */
199
 
200
#define COERCE_ARRAY(arg)    \
201
do { COERCE_REF(arg);                                                   \
202
  if (current_language->c_style_arrays                                  \
203
      && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY)               \
204
    arg = value_coerce_array (arg);                                     \
205
  if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC)                   \
206
    arg = value_coerce_function (arg);                                  \
207
} while (0)
208
 
209
#define COERCE_NUMBER(arg)  \
210
  do { COERCE_ARRAY(arg);  COERCE_ENUM(arg); } while (0)
211
 
212
#define COERCE_VARYING_ARRAY(arg, real_arg_type)        \
213
{ if (chill_varying_type (real_arg_type))  \
214
    arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
215
 
216
/* If ARG is an enum, convert it to an integer.  */
217
 
218
#define COERCE_ENUM(arg)   { \
219
  if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM)   \
220
    arg = value_cast (builtin_type_unsigned_int, arg);                  \
221
}
222
 
223
/* Internal variables (variables for convenience of use of debugger)
224
   are recorded as a chain of these structures.  */
225
 
226
struct internalvar
227
  {
228
    struct internalvar *next;
229
    char *name;
230
    value_ptr value;
231
  };
232
 
233
/* Pointer to member function.  Depends on compiler implementation. */
234
 
235
#define METHOD_PTR_IS_VIRTUAL(ADDR)  ((ADDR) & 0x80000000)
236
#define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
237
#define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
238
 
239
 
240
#include "symtab.h"
241
#include "gdbtypes.h"
242
#include "expression.h"
243
 
244
struct frame_info;
245
struct fn_field;
246
 
247
extern void print_address_demangle (CORE_ADDR, struct ui_file *, int);
248
 
249
extern LONGEST value_as_long PARAMS ((value_ptr val));
250
 
251
extern DOUBLEST value_as_double PARAMS ((value_ptr val));
252
 
253
extern CORE_ADDR value_as_pointer PARAMS ((value_ptr val));
254
 
255
extern LONGEST unpack_long PARAMS ((struct type * type, char *valaddr));
256
 
257
extern DOUBLEST unpack_double PARAMS ((struct type * type, char *valaddr,
258
                                       int *invp));
259
 
260
extern CORE_ADDR unpack_pointer PARAMS ((struct type * type, char *valaddr));
261
 
262
extern LONGEST unpack_field_as_long PARAMS ((struct type * type, char *valaddr,
263
                                             int fieldno));
264
 
265
extern value_ptr value_from_longest PARAMS ((struct type * type, LONGEST num));
266
 
267
extern value_ptr value_from_double PARAMS ((struct type * type, DOUBLEST num));
268
 
269
extern value_ptr value_from_string PARAMS ((char *string));
270
 
271
extern value_ptr value_at PARAMS ((struct type * type, CORE_ADDR addr, asection * sect));
272
 
273
extern value_ptr value_at_lazy PARAMS ((struct type * type, CORE_ADDR addr, asection * sect));
274
 
275
extern value_ptr value_from_register PARAMS ((struct type * type, int regnum,
276
                                              struct frame_info * frame));
277
 
278
extern value_ptr value_of_variable PARAMS ((struct symbol * var,
279
                                            struct block * b));
280
 
281
extern value_ptr value_of_register PARAMS ((int regnum));
282
 
283
extern int symbol_read_needs_frame PARAMS ((struct symbol *));
284
 
285
extern value_ptr read_var_value PARAMS ((struct symbol * var,
286
                                         struct frame_info * frame));
287
 
288
extern value_ptr locate_var_value PARAMS ((struct symbol * var,
289
                                           struct frame_info * frame));
290
 
291
extern value_ptr allocate_value PARAMS ((struct type * type));
292
 
293
extern value_ptr allocate_repeat_value PARAMS ((struct type * type, int count));
294
 
295
extern value_ptr value_mark PARAMS ((void));
296
 
297
extern void value_free_to_mark PARAMS ((value_ptr mark));
298
 
299
extern value_ptr value_string PARAMS ((char *ptr, int len));
300
extern value_ptr value_bitstring PARAMS ((char *ptr, int len));
301
 
302
extern value_ptr value_array PARAMS ((int lowbound, int highbound,
303
                                      value_ptr * elemvec));
304
 
305
extern value_ptr value_concat PARAMS ((value_ptr arg1, value_ptr arg2));
306
 
307
extern value_ptr value_binop PARAMS ((value_ptr arg1, value_ptr arg2,
308
                                      enum exp_opcode op));
309
 
310
extern value_ptr value_add PARAMS ((value_ptr arg1, value_ptr arg2));
311
 
312
extern value_ptr value_sub PARAMS ((value_ptr arg1, value_ptr arg2));
313
 
314
extern value_ptr value_coerce_array PARAMS ((value_ptr arg1));
315
 
316
extern value_ptr value_coerce_function PARAMS ((value_ptr arg1));
317
 
318
extern value_ptr value_ind PARAMS ((value_ptr arg1));
319
 
320
extern value_ptr value_addr PARAMS ((value_ptr arg1));
321
 
322
extern value_ptr value_assign PARAMS ((value_ptr toval, value_ptr fromval));
323
 
324
extern value_ptr value_neg PARAMS ((value_ptr arg1));
325
 
326
extern value_ptr value_complement PARAMS ((value_ptr arg1));
327
 
328
extern value_ptr value_struct_elt PARAMS ((value_ptr * argp, value_ptr * args,
329
                                           char *name,
330
                                           int *static_memfuncp, char *err));
331
 
332
extern value_ptr value_struct_elt_for_reference PARAMS ((struct type * domain,
333
                                                         int offset,
334
                                                      struct type * curtype,
335
                                                         char *name,
336
                                                     struct type * intype));
337
 
338
extern value_ptr value_static_field PARAMS ((struct type * type, int fieldno));
339
 
340
extern struct fn_field *value_find_oload_method_list PARAMS ((value_ptr *, char *, int, int *, int *, struct type **, int *));
341
 
342
extern int find_overload_match PARAMS ((struct type ** arg_types, int nargs, char *name, int method, int lax, value_ptr obj, struct symbol * fsym, value_ptr * valp, struct symbol ** symp, int *staticp));
343
 
344
extern value_ptr value_field PARAMS ((value_ptr arg1, int fieldno));
345
 
346
extern value_ptr value_primitive_field PARAMS ((value_ptr arg1, int offset,
347
                                                int fieldno,
348
                                                struct type * arg_type));
349
 
350
extern struct type *
351
  value_rtti_type PARAMS ((value_ptr, int *, int *, int *));
352
 
353
extern struct type *
354
  value_rtti_target_type PARAMS ((value_ptr, int *, int *, int *));
355
 
356
extern value_ptr
357
  value_full_object PARAMS ((value_ptr, struct type *, int, int, int));
358
 
359
extern value_ptr value_cast PARAMS ((struct type * type, value_ptr arg2));
360
 
361
extern value_ptr value_zero PARAMS ((struct type * type, enum lval_type lv));
362
 
363
extern value_ptr value_repeat PARAMS ((value_ptr arg1, int count));
364
 
365
extern value_ptr value_subscript PARAMS ((value_ptr array, value_ptr idx));
366
 
367
extern value_ptr value_from_vtable_info PARAMS ((value_ptr arg,
368
                                                 struct type * type));
369
 
370
extern value_ptr value_being_returned PARAMS ((struct type * valtype,
371
                                               char *retbuf,
372
                                               int struct_return));
373
 
374
extern value_ptr value_in PARAMS ((value_ptr element, value_ptr set));
375
 
376
extern int value_bit_index PARAMS ((struct type * type, char *addr, int index));
377
 
378
extern int using_struct_return PARAMS ((value_ptr function, CORE_ADDR funcaddr,
379
                                      struct type * value_type, int gcc_p));
380
 
381
extern void set_return_value PARAMS ((value_ptr val));
382
 
383
extern value_ptr evaluate_expression PARAMS ((struct expression * exp));
384
 
385
extern value_ptr evaluate_type PARAMS ((struct expression * exp));
386
 
387
extern value_ptr evaluate_subexp_with_coercion PARAMS ((struct expression *,
388
                                                        int *, enum noside));
389
 
390
extern value_ptr parse_and_eval PARAMS ((char *exp));
391
 
392
extern value_ptr parse_to_comma_and_eval PARAMS ((char **expp));
393
 
394
extern struct type *parse_and_eval_type PARAMS ((char *p, int length));
395
 
396
extern CORE_ADDR parse_and_eval_address PARAMS ((char *exp));
397
 
398
extern CORE_ADDR parse_and_eval_address_1 PARAMS ((char **expptr));
399
 
400
extern value_ptr access_value_history PARAMS ((int num));
401
 
402
extern value_ptr value_of_internalvar PARAMS ((struct internalvar * var));
403
 
404
extern void set_internalvar PARAMS ((struct internalvar * var, value_ptr val));
405
 
406
extern void set_internalvar_component PARAMS ((struct internalvar * var,
407
                                               int offset,
408
                                               int bitpos, int bitsize,
409
                                               value_ptr newvalue));
410
 
411
extern struct internalvar *lookup_internalvar PARAMS ((char *name));
412
 
413
extern int value_equal PARAMS ((value_ptr arg1, value_ptr arg2));
414
 
415
extern int value_less PARAMS ((value_ptr arg1, value_ptr arg2));
416
 
417
extern int value_logical_not PARAMS ((value_ptr arg1));
418
 
419
/* C++ */
420
 
421
extern value_ptr value_of_this PARAMS ((int complain));
422
 
423
extern value_ptr value_x_binop PARAMS ((value_ptr arg1, value_ptr arg2,
424
                                        enum exp_opcode op,
425
                                        enum exp_opcode otherop,
426
                                        enum noside noside));
427
 
428
extern value_ptr value_x_unop PARAMS ((value_ptr arg1, enum exp_opcode op,
429
                                       enum noside noside));
430
 
431
extern value_ptr value_fn_field PARAMS ((value_ptr * arg1p, struct fn_field * f,
432
                                         int j,
433
                                         struct type * type, int offset));
434
 
435
extern value_ptr value_virtual_fn_field PARAMS ((value_ptr * arg1p,
436
                                                 struct fn_field * f, int j,
437
                                                 struct type * type,
438
                                                 int offset));
439
 
440
extern int binop_user_defined_p PARAMS ((enum exp_opcode op,
441
                                         value_ptr arg1, value_ptr arg2));
442
 
443
extern int unop_user_defined_p PARAMS ((enum exp_opcode op, value_ptr arg1));
444
 
445
extern int destructor_name_p PARAMS ((const char *name,
446
                                      const struct type * type));
447
 
448
#define value_free(val) free ((PTR)val)
449
 
450
extern void free_all_values PARAMS ((void));
451
 
452
extern void release_value PARAMS ((value_ptr val));
453
 
454
extern int record_latest_value PARAMS ((value_ptr val));
455
 
456
extern void registers_changed PARAMS ((void));
457
 
458
extern void read_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
459
 
460
extern void write_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
461
 
462
extern void
463
read_register_gen PARAMS ((int regno, char *myaddr));
464
 
465
extern CORE_ADDR
466
  read_register PARAMS ((int regno));
467
 
468
extern CORE_ADDR
469
  read_register_pid PARAMS ((int regno, int pid));
470
 
471
extern void
472
write_register PARAMS ((int regno, LONGEST val));
473
 
474
extern void
475
write_register_pid PARAMS ((int regno, CORE_ADDR val, int pid));
476
 
477
extern void
478
supply_register PARAMS ((int regno, char *val));
479
 
480
extern void get_saved_register PARAMS ((char *raw_buffer, int *optimized,
481
                                        CORE_ADDR * addrp,
482
                                        struct frame_info * frame,
483
                                        int regnum, enum lval_type * lval));
484
 
485
extern void
486
modify_field PARAMS ((char *addr, LONGEST fieldval, int bitpos, int bitsize));
487
 
488
extern void type_print (struct type * type, char *varstring,
489
                        struct ui_file * stream, int show);
490
 
491
extern char *baseclass_addr PARAMS ((struct type * type, int index,
492
                                     char *valaddr,
493
                                     value_ptr * valuep, int *errp));
494
 
495
extern void print_longest (struct ui_file * stream, int format,
496
                           int use_local, LONGEST val);
497
 
498
extern void print_floating (char *valaddr, struct type * type,
499
                            struct ui_file * stream);
500
 
501
extern int value_print (value_ptr val, struct ui_file *stream, int format,
502
                        enum val_prettyprint pretty);
503
 
504
extern void value_print_array_elements (value_ptr val,
505
                                        struct ui_file *stream,
506
                                        int format,
507
                                        enum val_prettyprint pretty);
508
 
509
extern value_ptr
510
  value_release_to_mark PARAMS ((value_ptr mark));
511
 
512
extern int val_print (struct type * type, char *valaddr,
513
                      int embedded_offset, CORE_ADDR address,
514
                      struct ui_file * stream, int format,
515
                      int deref_ref, int recurse,
516
                      enum val_prettyprint pretty);
517
 
518
extern int val_print_string (CORE_ADDR addr, int len, int width, struct ui_file *stream);
519
 
520
extern void print_variable_value (struct symbol * var,
521
                                  struct frame_info * frame,
522
                                  struct ui_file *stream);
523
 
524
extern int check_field PARAMS ((value_ptr, const char *));
525
 
526
extern void c_typedef_print (struct type * type, struct symbol * news,
527
                             struct ui_file * stream);
528
 
529
extern char *
530
  internalvar_name PARAMS ((struct internalvar * var));
531
 
532
extern void
533
clear_value_history PARAMS ((void));
534
 
535
extern void
536
clear_internalvars PARAMS ((void));
537
 
538
/* From values.c */
539
 
540
extern value_ptr value_copy PARAMS ((value_ptr));
541
 
542
extern int baseclass_offset PARAMS ((struct type *, int, char *, CORE_ADDR));
543
 
544
/* From valops.c */
545
 
546
extern value_ptr varying_to_slice PARAMS ((value_ptr));
547
 
548
extern value_ptr value_slice PARAMS ((value_ptr, int, int));
549
 
550
extern value_ptr call_function_by_hand PARAMS ((value_ptr, int, value_ptr *));
551
 
552
extern int default_coerce_float_to_double (struct type *, struct type *);
553
 
554
extern int standard_coerce_float_to_double (struct type *, struct type *);
555
 
556
extern value_ptr value_literal_complex PARAMS ((value_ptr, value_ptr, struct type *));
557
 
558
extern void find_rt_vbase_offset PARAMS ((struct type *, struct type *, char *, int, int *, int *));
559
 
560
extern value_ptr find_function_in_inferior PARAMS ((char *));
561
 
562
extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
563
 
564
extern CORE_ADDR default_push_arguments PARAMS ((int nargs, value_ptr * args,
565
                                                 CORE_ADDR sp,
566
                                                 int struct_return,
567
                                                 CORE_ADDR struct_addr));
568
 
569
#endif /* !defined (VALUE_H) */

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