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1 /* Definitions for values of C expressions, for GDB.
2
3 Copyright (C) 1986-2013 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #if !defined (VALUE_H)
21 #define VALUE_H 1
22
23 #include "doublest.h"
24 #include "frame.h" /* For struct frame_id. */
25
26 struct block;
27 struct expression;
28 struct regcache;
29 struct symbol;
30 struct type;
31 struct ui_file;
32 struct language_defn;
33 struct value_print_options;
34
35 /* The structure which defines the type of a value. It should never
36 be possible for a program lval value to survive over a call to the
37 inferior (i.e. to be put into the history list or an internal
38 variable). */
39
40 struct value;
41
42 /* Values are stored in a chain, so that they can be deleted easily
43 over calls to the inferior. Values assigned to internal variables,
44 put into the value history or exposed to Python are taken off this
45 list. */
46
47 struct value *value_next (struct value *);
48
49 /* Type of the value. */
50
51 extern struct type *value_type (const struct value *);
52
53 /* This is being used to change the type of an existing value, that
54 code should instead be creating a new value with the changed type
55 (but possibly shared content). */
56
57 extern void deprecated_set_value_type (struct value *value,
58 struct type *type);
59
60 /* Only used for bitfields; number of bits contained in them. */
61
62 extern int value_bitsize (const struct value *);
63 extern void set_value_bitsize (struct value *, int bit);
64
65 /* Only used for bitfields; position of start of field. For
66 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
67 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
68
69 extern int value_bitpos (const struct value *);
70 extern void set_value_bitpos (struct value *, int bit);
71
72 /* Only used for bitfields; the containing value. This allows a
73 single read from the target when displaying multiple
74 bitfields. */
75
76 struct value *value_parent (struct value *);
77 extern void set_value_parent (struct value *value, struct value *parent);
78
79 /* Describes offset of a value within lval of a structure in bytes.
80 If lval == lval_memory, this is an offset to the address. If lval
81 == lval_register, this is a further offset from location.address
82 within the registers structure. Note also the member
83 embedded_offset below. */
84
85 extern int value_offset (const struct value *);
86 extern void set_value_offset (struct value *, int offset);
87
88 /* The comment from "struct value" reads: ``Is it modifiable? Only
89 relevant if lval != not_lval.''. Shouldn't the value instead be
90 not_lval and be done with it? */
91
92 extern int deprecated_value_modifiable (struct value *value);
93
94 /* If a value represents a C++ object, then the `type' field gives the
95 object's compile-time type. If the object actually belongs to some
96 class derived from `type', perhaps with other base classes and
97 additional members, then `type' is just a subobject of the real
98 thing, and the full object is probably larger than `type' would
99 suggest.
100
101 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
102 actually determine the object's run-time type by looking at the
103 run-time type information in the vtable. When this information is
104 available, we may elect to read in the entire object, for several
105 reasons:
106
107 - When printing the value, the user would probably rather see the
108 full object, not just the limited portion apparent from the
109 compile-time type.
110
111 - If `type' has virtual base classes, then even printing `type'
112 alone may require reaching outside the `type' portion of the
113 object to wherever the virtual base class has been stored.
114
115 When we store the entire object, `enclosing_type' is the run-time
116 type -- the complete object -- and `embedded_offset' is the offset
117 of `type' within that larger type, in bytes. The value_contents()
118 macro takes `embedded_offset' into account, so most GDB code
119 continues to see the `type' portion of the value, just as the
120 inferior would.
121
122 If `type' is a pointer to an object, then `enclosing_type' is a
123 pointer to the object's run-time type, and `pointed_to_offset' is
124 the offset in bytes from the full object to the pointed-to object
125 -- that is, the value `embedded_offset' would have if we followed
126 the pointer and fetched the complete object. (I don't really see
127 the point. Why not just determine the run-time type when you
128 indirect, and avoid the special case? The contents don't matter
129 until you indirect anyway.)
130
131 If we're not doing anything fancy, `enclosing_type' is equal to
132 `type', and `embedded_offset' is zero, so everything works
133 normally. */
134
135 extern struct type *value_enclosing_type (struct value *);
136 extern void set_value_enclosing_type (struct value *val,
137 struct type *new_type);
138
139 /* Returns value_type or value_enclosing_type depending on
140 value_print_options.objectprint.
141
142 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
143 only for pointers and references, else it will be returned
144 for all the types (e.g. structures). This option is useful
145 to prevent retrieving enclosing type for the base classes fields.
146
147 REAL_TYPE_FOUND is used to inform whether the real type was found
148 (or just static type was used). The NULL may be passed if it is not
149 necessary. */
150
151 extern struct type *value_actual_type (struct value *value,
152 int resolve_simple_types,
153 int *real_type_found);
154
155 extern int value_pointed_to_offset (struct value *value);
156 extern void set_value_pointed_to_offset (struct value *value, int val);
157 extern int value_embedded_offset (struct value *value);
158 extern void set_value_embedded_offset (struct value *value, int val);
159
160 /* For lval_computed values, this structure holds functions used to
161 retrieve and set the value (or portions of the value).
162
163 For each function, 'V' is the 'this' pointer: an lval_funcs
164 function F may always assume that the V it receives is an
165 lval_computed value, and has F in the appropriate slot of its
166 lval_funcs structure. */
167
168 struct lval_funcs
169 {
170 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
171 a problem arises in obtaining VALUE's bits, this function should
172 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
173 non-optimized-out value is an internal error. */
174 void (*read) (struct value *v);
175
176 /* Handle an assignment TOVAL = FROMVAL by writing the value of
177 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
178 been updated. If a problem arises in doing so, this function
179 should call 'error'. If it is NULL such TOVAL assignment is an error as
180 TOVAL is not considered as an lvalue. */
181 void (*write) (struct value *toval, struct value *fromval);
182
183 /* Check the validity of some bits in VALUE. This should return 1
184 if all the bits starting at OFFSET and extending for LENGTH bits
185 are valid, or 0 if any bit is invalid. */
186 int (*check_validity) (const struct value *value, int offset, int length);
187
188 /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid. */
189 int (*check_any_valid) (const struct value *value);
190
191 /* If non-NULL, this is used to implement pointer indirection for
192 this value. This method may return NULL, in which case value_ind
193 will fall back to ordinary indirection. */
194 struct value *(*indirect) (struct value *value);
195
196 /* If non-NULL, this is used to implement reference resolving for
197 this value. This method may return NULL, in which case coerce_ref
198 will fall back to ordinary references resolving. */
199 struct value *(*coerce_ref) (const struct value *value);
200
201 /* If non-NULL, this is used to determine whether the indicated bits
202 of VALUE are a synthetic pointer. */
203 int (*check_synthetic_pointer) (const struct value *value,
204 int offset, int length);
205
206 /* Return a duplicate of VALUE's closure, for use in a new value.
207 This may simply return the same closure, if VALUE's is
208 reference-counted or statically allocated.
209
210 This may be NULL, in which case VALUE's closure is re-used in the
211 new value. */
212 void *(*copy_closure) (const struct value *v);
213
214 /* Drop VALUE's reference to its closure. Maybe this frees the
215 closure; maybe this decrements a reference count; maybe the
216 closure is statically allocated and this does nothing.
217
218 This may be NULL, in which case no action is taken to free
219 VALUE's closure. */
220 void (*free_closure) (struct value *v);
221 };
222
223 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
224 and closure CLOSURE. */
225
226 extern struct value *allocate_computed_value (struct type *type,
227 const struct lval_funcs *funcs,
228 void *closure);
229
230 /* Helper function to check the validity of some bits of a value.
231
232 If TYPE represents some aggregate type (e.g., a structure), return 1.
233
234 Otherwise, any of the bytes starting at OFFSET and extending for
235 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
236 return 0. The checking is done using FUNCS.
237
238 Otherwise, return 1. */
239
240 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
241 int embedded_offset,
242 const struct value *val);
243
244 extern struct value *allocate_optimized_out_value (struct type *type);
245
246 /* If VALUE is lval_computed, return its lval_funcs structure. */
247
248 extern const struct lval_funcs *value_computed_funcs (const struct value *);
249
250 /* If VALUE is lval_computed, return its closure. The meaning of the
251 returned value depends on the functions VALUE uses. */
252
253 extern void *value_computed_closure (const struct value *value);
254
255 /* If zero, contents of this value are in the contents field. If
256 nonzero, contents are in inferior. If the lval field is lval_memory,
257 the contents are in inferior memory at location.address plus offset.
258 The lval field may also be lval_register.
259
260 WARNING: This field is used by the code which handles watchpoints
261 (see breakpoint.c) to decide whether a particular value can be
262 watched by hardware watchpoints. If the lazy flag is set for some
263 member of a value chain, it is assumed that this member of the
264 chain doesn't need to be watched as part of watching the value
265 itself. This is how GDB avoids watching the entire struct or array
266 when the user wants to watch a single struct member or array
267 element. If you ever change the way lazy flag is set and reset, be
268 sure to consider this use as well! */
269
270 extern int value_lazy (struct value *);
271 extern void set_value_lazy (struct value *value, int val);
272
273 extern int value_stack (struct value *);
274 extern void set_value_stack (struct value *value, int val);
275
276 /* value_contents() and value_contents_raw() both return the address
277 of the gdb buffer used to hold a copy of the contents of the lval.
278 value_contents() is used when the contents of the buffer are needed
279 -- it uses value_fetch_lazy() to load the buffer from the process
280 being debugged if it hasn't already been loaded
281 (value_contents_writeable() is used when a writeable but fetched
282 buffer is required).. value_contents_raw() is used when data is
283 being stored into the buffer, or when it is certain that the
284 contents of the buffer are valid.
285
286 Note: The contents pointer is adjusted by the offset required to
287 get to the real subobject, if the value happens to represent
288 something embedded in a larger run-time object. */
289
290 extern gdb_byte *value_contents_raw (struct value *);
291
292 /* Actual contents of the value. For use of this value; setting it
293 uses the stuff above. Not valid if lazy is nonzero. Target
294 byte-order. We force it to be aligned properly for any possible
295 value. Note that a value therefore extends beyond what is
296 declared here. */
297
298 extern const gdb_byte *value_contents (struct value *);
299 extern gdb_byte *value_contents_writeable (struct value *);
300
301 /* The ALL variants of the above two macros do not adjust the returned
302 pointer by the embedded_offset value. */
303
304 extern gdb_byte *value_contents_all_raw (struct value *);
305 extern const gdb_byte *value_contents_all (struct value *);
306
307 /* Like value_contents_all, but does not require that the returned
308 bits be valid. This should only be used in situations where you
309 plan to check the validity manually. */
310 extern const gdb_byte *value_contents_for_printing (struct value *value);
311
312 /* Like value_contents_for_printing, but accepts a constant value
313 pointer. Unlike value_contents_for_printing however, the pointed
314 value must _not_ be lazy. */
315 extern const gdb_byte *
316 value_contents_for_printing_const (const struct value *value);
317
318 extern int value_fetch_lazy (struct value *val);
319 extern int value_contents_equal (struct value *val1, struct value *val2);
320
321 /* If nonzero, this is the value of a variable which does not actually
322 exist in the program. */
323 extern int value_optimized_out (struct value *value);
324 extern void set_value_optimized_out (struct value *value, int val);
325
326 /* Like value_optimized_out, but return false if any bit in the object
327 is valid. */
328 extern int value_entirely_optimized_out (const struct value *value);
329
330 /* Set or return field indicating whether a variable is initialized or
331 not, based on debugging information supplied by the compiler.
332 1 = initialized; 0 = uninitialized. */
333 extern int value_initialized (struct value *);
334 extern void set_value_initialized (struct value *, int);
335
336 /* Set COMPONENT's location as appropriate for a component of WHOLE
337 --- regardless of what kind of lvalue WHOLE is. */
338 extern void set_value_component_location (struct value *component,
339 const struct value *whole);
340
341 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
342 single value might have multiple LVALs), this hacked interface is
343 limited to just the first PIECE. Expect further change. */
344 /* Type of value; either not an lval, or one of the various different
345 possible kinds of lval. */
346 extern enum lval_type *deprecated_value_lval_hack (struct value *);
347 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
348
349 /* Like VALUE_LVAL, except the parameter can be const. */
350 extern enum lval_type value_lval_const (const struct value *value);
351
352 /* If lval == lval_memory, return the address in the inferior. If
353 lval == lval_register, return the byte offset into the registers
354 structure. Otherwise, return 0. The returned address
355 includes the offset, if any. */
356 extern CORE_ADDR value_address (const struct value *);
357
358 /* Like value_address, except the result does not include value's
359 offset. */
360 extern CORE_ADDR value_raw_address (struct value *);
361
362 /* Set the address of a value. */
363 extern void set_value_address (struct value *, CORE_ADDR);
364
365 /* Pointer to internal variable. */
366 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
367 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
368
369 /* Frame register value is relative to. This will be described in the
370 lval enum above as "lval_register". */
371 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
372 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
373
374 /* Register number if the value is from a register. */
375 extern short *deprecated_value_regnum_hack (struct value *);
376 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
377
378 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
379 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
380
381 extern struct value *coerce_ref_if_computed (const struct value *arg);
382
383 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
384 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
385 ORIGINAL_VAL are the type and value of the original reference or pointer.
386
387 Note, that VALUE is modified by this function.
388
389 It is a common implementation for coerce_ref and value_ind. */
390
391 extern struct value * readjust_indirect_value_type (struct value *value,
392 struct type *enc_type,
393 struct type *original_type,
394 struct value *original_val);
395
396 /* Convert a REF to the object referenced. */
397
398 extern struct value *coerce_ref (struct value *value);
399
400 /* If ARG is an array, convert it to a pointer.
401 If ARG is a function, convert it to a function pointer.
402
403 References are dereferenced. */
404
405 extern struct value *coerce_array (struct value *value);
406
407 /* Given a value, determine whether the bits starting at OFFSET and
408 extending for LENGTH bits are valid. This returns nonzero if all
409 bits in the given range are valid, zero if any bit is invalid. */
410
411 extern int value_bits_valid (const struct value *value,
412 int offset, int length);
413
414 /* Given a value, determine whether the bits starting at OFFSET and
415 extending for LENGTH bits are a synthetic pointer. */
416
417 extern int value_bits_synthetic_pointer (const struct value *value,
418 int offset, int length);
419
420 /* Given a value, determine whether the contents bytes starting at
421 OFFSET and extending for LENGTH bytes are available. This returns
422 nonzero if all bytes in the given range are available, zero if any
423 byte is unavailable. */
424
425 extern int value_bytes_available (const struct value *value,
426 int offset, int length);
427
428 /* Like value_bytes_available, but return false if any byte in the
429 whole object is unavailable. */
430 extern int value_entirely_available (struct value *value);
431
432 /* Mark VALUE's content bytes starting at OFFSET and extending for
433 LENGTH bytes as unavailable. */
434
435 extern void mark_value_bytes_unavailable (struct value *value,
436 int offset, int length);
437
438 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
439 LENGTH bytes of VAL2's contents starting at OFFSET2.
440
441 Note that "contents" refers to the whole value's contents
442 (value_contents_all), without any embedded offset adjustment. For
443 example, to compare a complete object value with itself, including
444 its enclosing type chunk, you'd do:
445
446 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
447 value_available_contents (val, 0, val, 0, len);
448
449 Returns true iff the set of available contents match. Unavailable
450 contents compare equal with unavailable contents, and different
451 with any available byte. For example, if 'x's represent an
452 unavailable byte, and 'V' and 'Z' represent different available
453 bytes, in a value with length 16:
454
455 offset: 0 4 8 12 16
456 contents: xxxxVVVVxxxxVVZZ
457
458 then:
459
460 value_available_contents_eq(val, 0, val, 8, 6) => 1
461 value_available_contents_eq(val, 0, val, 4, 4) => 1
462 value_available_contents_eq(val, 0, val, 8, 8) => 0
463 value_available_contents_eq(val, 4, val, 12, 2) => 1
464 value_available_contents_eq(val, 4, val, 12, 4) => 0
465 value_available_contents_eq(val, 3, val, 4, 4) => 0
466 */
467
468 extern int value_available_contents_eq (const struct value *val1, int offset1,
469 const struct value *val2, int offset2,
470 int length);
471
472 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
473 is (or will be copied to) VAL's contents buffer offset by
474 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
475 Marks value contents ranges as unavailable if the corresponding
476 memory is likewise unavailable. STACK indicates whether the memory
477 is known to be stack memory. */
478
479 extern void read_value_memory (struct value *val, int embedded_offset,
480 int stack, CORE_ADDR memaddr,
481 gdb_byte *buffer, size_t length);
482
483 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
484 into each element of a new vector value with VECTOR_TYPE. */
485
486 struct value *value_vector_widen (struct value *scalar_value,
487 struct type *vector_type);
488
489 \f
490
491 #include "symtab.h"
492 #include "gdbtypes.h"
493 #include "expression.h"
494
495 struct frame_info;
496 struct fn_field;
497
498 extern int print_address_demangle (const struct value_print_options *,
499 struct gdbarch *, CORE_ADDR,
500 struct ui_file *, int);
501
502 extern LONGEST value_as_long (struct value *val);
503 extern DOUBLEST value_as_double (struct value *val);
504 extern CORE_ADDR value_as_address (struct value *val);
505
506 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
507 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
508 int *invp);
509 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
510
511 extern int unpack_value_bits_as_long (struct type *field_type,
512 const gdb_byte *valaddr,
513 int embedded_offset, int bitpos,
514 int bitsize,
515 const struct value *original_value,
516 LONGEST *result);
517
518 extern LONGEST unpack_field_as_long (struct type *type,
519 const gdb_byte *valaddr,
520 int fieldno);
521 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
522 int embedded_offset, int fieldno,
523 const struct value *val, LONGEST *result);
524
525 extern struct value *value_field_bitfield (struct type *type, int fieldno,
526 const gdb_byte *valaddr,
527 int embedded_offset,
528 const struct value *val);
529
530 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
531
532 extern struct value *value_from_longest (struct type *type, LONGEST num);
533 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
534 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
535 extern struct value *value_from_double (struct type *type, DOUBLEST num);
536 extern struct value *value_from_decfloat (struct type *type,
537 const gdb_byte *decbytes);
538 extern struct value *value_from_history_ref (char *, char **);
539
540 extern struct value *value_at (struct type *type, CORE_ADDR addr);
541 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
542
543 extern struct value *value_from_contents_and_address (struct type *,
544 const gdb_byte *,
545 CORE_ADDR);
546 extern struct value *value_from_contents (struct type *, const gdb_byte *);
547
548 extern struct value *default_value_from_register (struct type *type,
549 int regnum,
550 struct frame_info *frame);
551
552 extern void read_frame_register_value (struct value *value,
553 struct frame_info *frame);
554
555 extern struct value *value_from_register (struct type *type, int regnum,
556 struct frame_info *frame);
557
558 extern CORE_ADDR address_from_register (struct type *type, int regnum,
559 struct frame_info *frame);
560
561 extern struct value *value_of_variable (struct symbol *var,
562 const struct block *b);
563
564 extern struct value *address_of_variable (struct symbol *var,
565 const struct block *b);
566
567 extern struct value *value_of_register (int regnum, struct frame_info *frame);
568
569 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
570
571 extern int symbol_read_needs_frame (struct symbol *);
572
573 extern struct value *read_var_value (struct symbol *var,
574 struct frame_info *frame);
575
576 extern struct value *default_read_var_value (struct symbol *var,
577 struct frame_info *frame);
578
579 extern struct value *allocate_value (struct type *type);
580 extern struct value *allocate_value_lazy (struct type *type);
581 extern void allocate_value_contents (struct value *value);
582 extern void value_contents_copy (struct value *dst, int dst_offset,
583 struct value *src, int src_offset,
584 int length);
585 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
586 struct value *src, int src_offset,
587 int length);
588
589 extern struct value *allocate_repeat_value (struct type *type, int count);
590
591 extern struct value *value_mark (void);
592
593 extern void value_free_to_mark (struct value *mark);
594
595 extern struct value *value_cstring (char *ptr, ssize_t len,
596 struct type *char_type);
597 extern struct value *value_string (char *ptr, ssize_t len,
598 struct type *char_type);
599
600 extern struct value *value_array (int lowbound, int highbound,
601 struct value **elemvec);
602
603 extern struct value *value_concat (struct value *arg1, struct value *arg2);
604
605 extern struct value *value_binop (struct value *arg1, struct value *arg2,
606 enum exp_opcode op);
607
608 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
609
610 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
611
612 extern int value_must_coerce_to_target (struct value *arg1);
613
614 extern struct value *value_coerce_to_target (struct value *arg1);
615
616 extern struct value *value_coerce_array (struct value *arg1);
617
618 extern struct value *value_coerce_function (struct value *arg1);
619
620 extern struct value *value_ind (struct value *arg1);
621
622 extern struct value *value_addr (struct value *arg1);
623
624 extern struct value *value_ref (struct value *arg1);
625
626 extern struct value *value_assign (struct value *toval,
627 struct value *fromval);
628
629 extern struct value *value_pos (struct value *arg1);
630
631 extern struct value *value_neg (struct value *arg1);
632
633 extern struct value *value_complement (struct value *arg1);
634
635 extern struct value *value_struct_elt (struct value **argp,
636 struct value **args,
637 const char *name, int *static_memfuncp,
638 const char *err);
639
640 extern struct value *value_aggregate_elt (struct type *curtype,
641 char *name,
642 struct type *expect_type,
643 int want_address,
644 enum noside noside);
645
646 extern struct value *value_static_field (struct type *type, int fieldno);
647
648 enum oload_search_type { NON_METHOD, METHOD, BOTH };
649
650 extern int find_overload_match (struct value **args, int nargs,
651 const char *name,
652 enum oload_search_type method,
653 struct value **objp, struct symbol *fsym,
654 struct value **valp, struct symbol **symp,
655 int *staticp, const int no_adl);
656
657 extern struct value *value_field (struct value *arg1, int fieldno);
658
659 extern struct value *value_primitive_field (struct value *arg1, int offset,
660 int fieldno,
661 struct type *arg_type);
662
663
664 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
665 int *);
666
667 extern struct value *value_full_object (struct value *, struct type *, int,
668 int, int);
669
670 extern struct value *value_cast_pointers (struct type *, struct value *, int);
671
672 extern struct value *value_cast (struct type *type, struct value *arg2);
673
674 extern struct value *value_reinterpret_cast (struct type *type,
675 struct value *arg);
676
677 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
678
679 extern struct value *value_zero (struct type *type, enum lval_type lv);
680
681 extern struct value *value_one (struct type *type);
682
683 extern struct value *value_repeat (struct value *arg1, int count);
684
685 extern struct value *value_subscript (struct value *array, LONGEST index);
686
687 extern struct value *value_bitstring_subscript (struct type *type,
688 struct value *bitstring,
689 LONGEST index);
690
691 extern struct value *register_value_being_returned (struct type *valtype,
692 struct regcache *retbuf);
693
694 extern int value_in (struct value *element, struct value *set);
695
696 extern int value_bit_index (struct type *type, const gdb_byte *addr,
697 int index);
698
699 extern enum return_value_convention
700 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
701 struct type *value_type);
702
703 extern int using_struct_return (struct gdbarch *gdbarch,
704 struct value *function,
705 struct type *value_type);
706
707 extern struct value *evaluate_expression (struct expression *exp);
708
709 extern struct value *evaluate_type (struct expression *exp);
710
711 extern struct value *evaluate_subexp (struct type *expect_type,
712 struct expression *exp,
713 int *pos, enum noside noside);
714
715 extern struct value *evaluate_subexpression_type (struct expression *exp,
716 int subexp);
717
718 extern void fetch_subexp_value (struct expression *exp, int *pc,
719 struct value **valp, struct value **resultp,
720 struct value **val_chain);
721
722 extern char *extract_field_op (struct expression *exp, int *subexp);
723
724 extern struct value *evaluate_subexp_with_coercion (struct expression *,
725 int *, enum noside);
726
727 extern struct value *parse_and_eval (const char *exp);
728
729 extern struct value *parse_to_comma_and_eval (const char **expp);
730
731 extern struct type *parse_and_eval_type (char *p, int length);
732
733 extern CORE_ADDR parse_and_eval_address (const char *exp);
734
735 extern LONGEST parse_and_eval_long (char *exp);
736
737 extern void unop_promote (const struct language_defn *language,
738 struct gdbarch *gdbarch,
739 struct value **arg1);
740
741 extern void binop_promote (const struct language_defn *language,
742 struct gdbarch *gdbarch,
743 struct value **arg1, struct value **arg2);
744
745 extern struct value *access_value_history (int num);
746
747 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
748 struct internalvar *var);
749
750 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
751
752 extern void set_internalvar (struct internalvar *var, struct value *val);
753
754 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
755
756 extern void set_internalvar_string (struct internalvar *var,
757 const char *string);
758
759 extern void clear_internalvar (struct internalvar *var);
760
761 extern void set_internalvar_component (struct internalvar *var,
762 int offset,
763 int bitpos, int bitsize,
764 struct value *newvalue);
765
766 extern struct internalvar *lookup_only_internalvar (const char *name);
767
768 extern struct internalvar *create_internalvar (const char *name);
769
770 extern VEC (char_ptr) *complete_internalvar (const char *name);
771
772 /* An internalvar can be dynamically computed by supplying a vector of
773 function pointers to perform various operations. */
774
775 struct internalvar_funcs
776 {
777 /* Compute the value of the variable. The DATA argument passed to
778 the function is the same argument that was passed to
779 `create_internalvar_type_lazy'. */
780
781 struct value *(*make_value) (struct gdbarch *arch,
782 struct internalvar *var,
783 void *data);
784
785 /* Update the agent expression EXPR with bytecode to compute the
786 value. VALUE is the agent value we are updating. The DATA
787 argument passed to this function is the same argument that was
788 passed to `create_internalvar_type_lazy'. If this pointer is
789 NULL, then the internalvar cannot be compiled to an agent
790 expression. */
791
792 void (*compile_to_ax) (struct internalvar *var,
793 struct agent_expr *expr,
794 struct axs_value *value,
795 void *data);
796
797 /* If non-NULL, this is called to destroy DATA. The DATA argument
798 passed to this function is the same argument that was passed to
799 `create_internalvar_type_lazy'. */
800
801 void (*destroy) (void *data);
802 };
803
804 extern struct internalvar *
805 create_internalvar_type_lazy (const char *name,
806 const struct internalvar_funcs *funcs,
807 void *data);
808
809 /* Compile an internal variable to an agent expression. VAR is the
810 variable to compile; EXPR and VALUE are the agent expression we are
811 updating. This will return 0 if there is no known way to compile
812 VAR, and 1 if VAR was successfully compiled. It may also throw an
813 exception on error. */
814
815 extern int compile_internalvar_to_ax (struct internalvar *var,
816 struct agent_expr *expr,
817 struct axs_value *value);
818
819 extern struct internalvar *lookup_internalvar (const char *name);
820
821 extern int value_equal (struct value *arg1, struct value *arg2);
822
823 extern int value_equal_contents (struct value *arg1, struct value *arg2);
824
825 extern int value_less (struct value *arg1, struct value *arg2);
826
827 extern int value_logical_not (struct value *arg1);
828
829 /* C++ */
830
831 extern struct value *value_of_this (const struct language_defn *lang);
832
833 extern struct value *value_of_this_silent (const struct language_defn *lang);
834
835 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
836 enum exp_opcode op,
837 enum exp_opcode otherop,
838 enum noside noside);
839
840 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
841 enum noside noside);
842
843 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
844 int j, struct type *type, int offset);
845
846 extern int binop_types_user_defined_p (enum exp_opcode op,
847 struct type *type1,
848 struct type *type2);
849
850 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
851 struct value *arg2);
852
853 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
854
855 extern int destructor_name_p (const char *name, struct type *type);
856
857 extern void value_incref (struct value *val);
858
859 extern void value_free (struct value *val);
860
861 extern void free_all_values (void);
862
863 extern void free_value_chain (struct value *v);
864
865 extern void release_value (struct value *val);
866
867 extern void release_value_or_incref (struct value *val);
868
869 extern int record_latest_value (struct value *val);
870
871 extern void modify_field (struct type *type, gdb_byte *addr,
872 LONGEST fieldval, int bitpos, int bitsize);
873
874 extern void type_print (struct type *type, const char *varstring,
875 struct ui_file *stream, int show);
876
877 extern char *type_to_string (struct type *type);
878
879 extern gdb_byte *baseclass_addr (struct type *type, int index,
880 gdb_byte *valaddr,
881 struct value **valuep, int *errp);
882
883 extern void print_longest (struct ui_file *stream, int format,
884 int use_local, LONGEST val);
885
886 extern void print_floating (const gdb_byte *valaddr, struct type *type,
887 struct ui_file *stream);
888
889 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
890 struct ui_file *stream);
891
892 extern void value_print (struct value *val, struct ui_file *stream,
893 const struct value_print_options *options);
894
895 extern void value_print_array_elements (struct value *val,
896 struct ui_file *stream, int format,
897 enum val_prettyprint pretty);
898
899 extern struct value *value_release_to_mark (struct value *mark);
900
901 extern void val_print (struct type *type, const gdb_byte *valaddr,
902 int embedded_offset, CORE_ADDR address,
903 struct ui_file *stream, int recurse,
904 const struct value *val,
905 const struct value_print_options *options,
906 const struct language_defn *language);
907
908 extern void common_val_print (struct value *val,
909 struct ui_file *stream, int recurse,
910 const struct value_print_options *options,
911 const struct language_defn *language);
912
913 extern int val_print_string (struct type *elttype, const char *encoding,
914 CORE_ADDR addr, int len,
915 struct ui_file *stream,
916 const struct value_print_options *options);
917
918 extern void print_variable_and_value (const char *name,
919 struct symbol *var,
920 struct frame_info *frame,
921 struct ui_file *stream,
922 int indent);
923
924 extern void typedef_print (struct type *type, struct symbol *news,
925 struct ui_file *stream);
926
927 extern char *internalvar_name (struct internalvar *var);
928
929 extern void preserve_values (struct objfile *);
930
931 /* From values.c */
932
933 extern struct value *value_copy (struct value *);
934
935 extern struct value *value_non_lval (struct value *);
936
937 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
938
939 /* From valops.c */
940
941 extern struct value *varying_to_slice (struct value *);
942
943 extern struct value *value_slice (struct value *, int, int);
944
945 extern struct value *value_literal_complex (struct value *, struct value *,
946 struct type *);
947
948 extern struct value *find_function_in_inferior (const char *,
949 struct objfile **);
950
951 extern struct value *value_allocate_space_in_inferior (int);
952
953 extern struct value *value_subscripted_rvalue (struct value *array,
954 LONGEST index, int lowerbound);
955
956 /* User function handler. */
957
958 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
959 const struct language_defn *language,
960 void *cookie,
961 int argc,
962 struct value **argv);
963
964 void add_internal_function (const char *name, const char *doc,
965 internal_function_fn handler,
966 void *cookie);
967
968 struct value *call_internal_function (struct gdbarch *gdbarch,
969 const struct language_defn *language,
970 struct value *function,
971 int argc, struct value **argv);
972
973 char *value_internal_function_name (struct value *);
974
975 #endif /* !defined (VALUE_H) */