]> git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/value.h
[PR tui/14880] Fetch values before comparing their contents.
[thirdparty/binutils-gdb.git] / gdb / value.h
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 We only know whether a value chunk is available if we've tried to
468 read it. As this routine is used by printing routines, which may
469 be printing values in the value history, long after the inferior is
470 gone, it works with const values. Therefore, this routine must not
471 be called with lazy values. */
472
473 extern int value_available_contents_eq (const struct value *val1, int offset1,
474 const struct value *val2, int offset2,
475 int length);
476
477 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
478 is (or will be copied to) VAL's contents buffer offset by
479 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
480 Marks value contents ranges as unavailable if the corresponding
481 memory is likewise unavailable. STACK indicates whether the memory
482 is known to be stack memory. */
483
484 extern void read_value_memory (struct value *val, int embedded_offset,
485 int stack, CORE_ADDR memaddr,
486 gdb_byte *buffer, size_t length);
487
488 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
489 into each element of a new vector value with VECTOR_TYPE. */
490
491 struct value *value_vector_widen (struct value *scalar_value,
492 struct type *vector_type);
493
494 \f
495
496 #include "symtab.h"
497 #include "gdbtypes.h"
498 #include "expression.h"
499
500 struct frame_info;
501 struct fn_field;
502
503 extern int print_address_demangle (const struct value_print_options *,
504 struct gdbarch *, CORE_ADDR,
505 struct ui_file *, int);
506
507 extern LONGEST value_as_long (struct value *val);
508 extern DOUBLEST value_as_double (struct value *val);
509 extern CORE_ADDR value_as_address (struct value *val);
510
511 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
512 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
513 int *invp);
514 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
515
516 extern int unpack_value_bits_as_long (struct type *field_type,
517 const gdb_byte *valaddr,
518 int embedded_offset, int bitpos,
519 int bitsize,
520 const struct value *original_value,
521 LONGEST *result);
522
523 extern LONGEST unpack_field_as_long (struct type *type,
524 const gdb_byte *valaddr,
525 int fieldno);
526 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
527 int embedded_offset, int fieldno,
528 const struct value *val, LONGEST *result);
529
530 extern struct value *value_field_bitfield (struct type *type, int fieldno,
531 const gdb_byte *valaddr,
532 int embedded_offset,
533 const struct value *val);
534
535 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
536
537 extern struct value *value_from_longest (struct type *type, LONGEST num);
538 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
539 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
540 extern struct value *value_from_double (struct type *type, DOUBLEST num);
541 extern struct value *value_from_decfloat (struct type *type,
542 const gdb_byte *decbytes);
543 extern struct value *value_from_history_ref (char *, char **);
544
545 extern struct value *value_at (struct type *type, CORE_ADDR addr);
546 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
547
548 extern struct value *value_from_contents_and_address (struct type *,
549 const gdb_byte *,
550 CORE_ADDR);
551 extern struct value *value_from_contents (struct type *, const gdb_byte *);
552
553 extern struct value *default_value_from_register (struct type *type,
554 int regnum,
555 struct frame_info *frame);
556
557 extern void read_frame_register_value (struct value *value,
558 struct frame_info *frame);
559
560 extern struct value *value_from_register (struct type *type, int regnum,
561 struct frame_info *frame);
562
563 extern CORE_ADDR address_from_register (struct type *type, int regnum,
564 struct frame_info *frame);
565
566 extern struct value *value_of_variable (struct symbol *var,
567 const struct block *b);
568
569 extern struct value *address_of_variable (struct symbol *var,
570 const struct block *b);
571
572 extern struct value *value_of_register (int regnum, struct frame_info *frame);
573
574 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
575
576 extern int symbol_read_needs_frame (struct symbol *);
577
578 extern struct value *read_var_value (struct symbol *var,
579 struct frame_info *frame);
580
581 extern struct value *default_read_var_value (struct symbol *var,
582 struct frame_info *frame);
583
584 extern struct value *allocate_value (struct type *type);
585 extern struct value *allocate_value_lazy (struct type *type);
586 extern void allocate_value_contents (struct value *value);
587 extern void value_contents_copy (struct value *dst, int dst_offset,
588 struct value *src, int src_offset,
589 int length);
590 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
591 struct value *src, int src_offset,
592 int length);
593
594 extern struct value *allocate_repeat_value (struct type *type, int count);
595
596 extern struct value *value_mark (void);
597
598 extern void value_free_to_mark (struct value *mark);
599
600 extern struct value *value_cstring (char *ptr, ssize_t len,
601 struct type *char_type);
602 extern struct value *value_string (char *ptr, ssize_t len,
603 struct type *char_type);
604
605 extern struct value *value_array (int lowbound, int highbound,
606 struct value **elemvec);
607
608 extern struct value *value_concat (struct value *arg1, struct value *arg2);
609
610 extern struct value *value_binop (struct value *arg1, struct value *arg2,
611 enum exp_opcode op);
612
613 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
614
615 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
616
617 extern int value_must_coerce_to_target (struct value *arg1);
618
619 extern struct value *value_coerce_to_target (struct value *arg1);
620
621 extern struct value *value_coerce_array (struct value *arg1);
622
623 extern struct value *value_coerce_function (struct value *arg1);
624
625 extern struct value *value_ind (struct value *arg1);
626
627 extern struct value *value_addr (struct value *arg1);
628
629 extern struct value *value_ref (struct value *arg1);
630
631 extern struct value *value_assign (struct value *toval,
632 struct value *fromval);
633
634 extern struct value *value_pos (struct value *arg1);
635
636 extern struct value *value_neg (struct value *arg1);
637
638 extern struct value *value_complement (struct value *arg1);
639
640 extern struct value *value_struct_elt (struct value **argp,
641 struct value **args,
642 const char *name, int *static_memfuncp,
643 const char *err);
644
645 extern struct value *value_aggregate_elt (struct type *curtype,
646 char *name,
647 struct type *expect_type,
648 int want_address,
649 enum noside noside);
650
651 extern struct value *value_static_field (struct type *type, int fieldno);
652
653 enum oload_search_type { NON_METHOD, METHOD, BOTH };
654
655 extern int find_overload_match (struct value **args, int nargs,
656 const char *name,
657 enum oload_search_type method,
658 struct value **objp, struct symbol *fsym,
659 struct value **valp, struct symbol **symp,
660 int *staticp, const int no_adl);
661
662 extern struct value *value_field (struct value *arg1, int fieldno);
663
664 extern struct value *value_primitive_field (struct value *arg1, int offset,
665 int fieldno,
666 struct type *arg_type);
667
668
669 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
670 int *);
671
672 extern struct value *value_full_object (struct value *, struct type *, int,
673 int, int);
674
675 extern struct value *value_cast_pointers (struct type *, struct value *, int);
676
677 extern struct value *value_cast (struct type *type, struct value *arg2);
678
679 extern struct value *value_reinterpret_cast (struct type *type,
680 struct value *arg);
681
682 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
683
684 extern struct value *value_zero (struct type *type, enum lval_type lv);
685
686 extern struct value *value_one (struct type *type);
687
688 extern struct value *value_repeat (struct value *arg1, int count);
689
690 extern struct value *value_subscript (struct value *array, LONGEST index);
691
692 extern struct value *value_bitstring_subscript (struct type *type,
693 struct value *bitstring,
694 LONGEST index);
695
696 extern struct value *register_value_being_returned (struct type *valtype,
697 struct regcache *retbuf);
698
699 extern int value_in (struct value *element, struct value *set);
700
701 extern int value_bit_index (struct type *type, const gdb_byte *addr,
702 int index);
703
704 extern enum return_value_convention
705 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
706 struct type *value_type);
707
708 extern int using_struct_return (struct gdbarch *gdbarch,
709 struct value *function,
710 struct type *value_type);
711
712 extern struct value *evaluate_expression (struct expression *exp);
713
714 extern struct value *evaluate_type (struct expression *exp);
715
716 extern struct value *evaluate_subexp (struct type *expect_type,
717 struct expression *exp,
718 int *pos, enum noside noside);
719
720 extern struct value *evaluate_subexpression_type (struct expression *exp,
721 int subexp);
722
723 extern void fetch_subexp_value (struct expression *exp, int *pc,
724 struct value **valp, struct value **resultp,
725 struct value **val_chain);
726
727 extern char *extract_field_op (struct expression *exp, int *subexp);
728
729 extern struct value *evaluate_subexp_with_coercion (struct expression *,
730 int *, enum noside);
731
732 extern struct value *parse_and_eval (const char *exp);
733
734 extern struct value *parse_to_comma_and_eval (const char **expp);
735
736 extern struct type *parse_and_eval_type (char *p, int length);
737
738 extern CORE_ADDR parse_and_eval_address (const char *exp);
739
740 extern LONGEST parse_and_eval_long (const char *exp);
741
742 extern void unop_promote (const struct language_defn *language,
743 struct gdbarch *gdbarch,
744 struct value **arg1);
745
746 extern void binop_promote (const struct language_defn *language,
747 struct gdbarch *gdbarch,
748 struct value **arg1, struct value **arg2);
749
750 extern struct value *access_value_history (int num);
751
752 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
753 struct internalvar *var);
754
755 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
756
757 extern void set_internalvar (struct internalvar *var, struct value *val);
758
759 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
760
761 extern void set_internalvar_string (struct internalvar *var,
762 const char *string);
763
764 extern void clear_internalvar (struct internalvar *var);
765
766 extern void set_internalvar_component (struct internalvar *var,
767 int offset,
768 int bitpos, int bitsize,
769 struct value *newvalue);
770
771 extern struct internalvar *lookup_only_internalvar (const char *name);
772
773 extern struct internalvar *create_internalvar (const char *name);
774
775 extern VEC (char_ptr) *complete_internalvar (const char *name);
776
777 /* An internalvar can be dynamically computed by supplying a vector of
778 function pointers to perform various operations. */
779
780 struct internalvar_funcs
781 {
782 /* Compute the value of the variable. The DATA argument passed to
783 the function is the same argument that was passed to
784 `create_internalvar_type_lazy'. */
785
786 struct value *(*make_value) (struct gdbarch *arch,
787 struct internalvar *var,
788 void *data);
789
790 /* Update the agent expression EXPR with bytecode to compute the
791 value. VALUE is the agent value we are updating. The DATA
792 argument passed to this function is the same argument that was
793 passed to `create_internalvar_type_lazy'. If this pointer is
794 NULL, then the internalvar cannot be compiled to an agent
795 expression. */
796
797 void (*compile_to_ax) (struct internalvar *var,
798 struct agent_expr *expr,
799 struct axs_value *value,
800 void *data);
801
802 /* If non-NULL, this is called to destroy DATA. The DATA argument
803 passed to this function is the same argument that was passed to
804 `create_internalvar_type_lazy'. */
805
806 void (*destroy) (void *data);
807 };
808
809 extern struct internalvar *
810 create_internalvar_type_lazy (const char *name,
811 const struct internalvar_funcs *funcs,
812 void *data);
813
814 /* Compile an internal variable to an agent expression. VAR is the
815 variable to compile; EXPR and VALUE are the agent expression we are
816 updating. This will return 0 if there is no known way to compile
817 VAR, and 1 if VAR was successfully compiled. It may also throw an
818 exception on error. */
819
820 extern int compile_internalvar_to_ax (struct internalvar *var,
821 struct agent_expr *expr,
822 struct axs_value *value);
823
824 extern struct internalvar *lookup_internalvar (const char *name);
825
826 extern int value_equal (struct value *arg1, struct value *arg2);
827
828 extern int value_equal_contents (struct value *arg1, struct value *arg2);
829
830 extern int value_less (struct value *arg1, struct value *arg2);
831
832 extern int value_logical_not (struct value *arg1);
833
834 /* C++ */
835
836 extern struct value *value_of_this (const struct language_defn *lang);
837
838 extern struct value *value_of_this_silent (const struct language_defn *lang);
839
840 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
841 enum exp_opcode op,
842 enum exp_opcode otherop,
843 enum noside noside);
844
845 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
846 enum noside noside);
847
848 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
849 int j, struct type *type, int offset);
850
851 extern int binop_types_user_defined_p (enum exp_opcode op,
852 struct type *type1,
853 struct type *type2);
854
855 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
856 struct value *arg2);
857
858 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
859
860 extern int destructor_name_p (const char *name, struct type *type);
861
862 extern void value_incref (struct value *val);
863
864 extern void value_free (struct value *val);
865
866 extern void free_all_values (void);
867
868 extern void free_value_chain (struct value *v);
869
870 extern void release_value (struct value *val);
871
872 extern void release_value_or_incref (struct value *val);
873
874 extern int record_latest_value (struct value *val);
875
876 extern void modify_field (struct type *type, gdb_byte *addr,
877 LONGEST fieldval, int bitpos, int bitsize);
878
879 extern void type_print (struct type *type, const char *varstring,
880 struct ui_file *stream, int show);
881
882 extern char *type_to_string (struct type *type);
883
884 extern gdb_byte *baseclass_addr (struct type *type, int index,
885 gdb_byte *valaddr,
886 struct value **valuep, int *errp);
887
888 extern void print_longest (struct ui_file *stream, int format,
889 int use_local, LONGEST val);
890
891 extern void print_floating (const gdb_byte *valaddr, struct type *type,
892 struct ui_file *stream);
893
894 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
895 struct ui_file *stream);
896
897 extern void value_print (struct value *val, struct ui_file *stream,
898 const struct value_print_options *options);
899
900 extern void value_print_array_elements (struct value *val,
901 struct ui_file *stream, int format,
902 enum val_prettyprint pretty);
903
904 extern struct value *value_release_to_mark (struct value *mark);
905
906 extern void val_print (struct type *type, const gdb_byte *valaddr,
907 int embedded_offset, CORE_ADDR address,
908 struct ui_file *stream, int recurse,
909 const struct value *val,
910 const struct value_print_options *options,
911 const struct language_defn *language);
912
913 extern void common_val_print (struct value *val,
914 struct ui_file *stream, int recurse,
915 const struct value_print_options *options,
916 const struct language_defn *language);
917
918 extern int val_print_string (struct type *elttype, const char *encoding,
919 CORE_ADDR addr, int len,
920 struct ui_file *stream,
921 const struct value_print_options *options);
922
923 extern void print_variable_and_value (const char *name,
924 struct symbol *var,
925 struct frame_info *frame,
926 struct ui_file *stream,
927 int indent);
928
929 extern void typedef_print (struct type *type, struct symbol *news,
930 struct ui_file *stream);
931
932 extern char *internalvar_name (struct internalvar *var);
933
934 extern void preserve_values (struct objfile *);
935
936 /* From values.c */
937
938 extern struct value *value_copy (struct value *);
939
940 extern struct value *value_non_lval (struct value *);
941
942 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
943
944 /* From valops.c */
945
946 extern struct value *varying_to_slice (struct value *);
947
948 extern struct value *value_slice (struct value *, int, int);
949
950 extern struct value *value_literal_complex (struct value *, struct value *,
951 struct type *);
952
953 extern struct value *find_function_in_inferior (const char *,
954 struct objfile **);
955
956 extern struct value *value_allocate_space_in_inferior (int);
957
958 extern struct value *value_subscripted_rvalue (struct value *array,
959 LONGEST index, int lowerbound);
960
961 /* User function handler. */
962
963 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
964 const struct language_defn *language,
965 void *cookie,
966 int argc,
967 struct value **argv);
968
969 void add_internal_function (const char *name, const char *doc,
970 internal_function_fn handler,
971 void *cookie);
972
973 struct value *call_internal_function (struct gdbarch *gdbarch,
974 const struct language_defn *language,
975 struct value *function,
976 int argc, struct value **argv);
977
978 char *value_internal_function_name (struct value *);
979
980 #endif /* !defined (VALUE_H) */