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1 /* Definitions for values of C expressions, for GDB.
2
3 Copyright (C) 1986-2014 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 struct xmethod_worker;
35
36 /* The structure which defines the type of a value. It should never
37 be possible for a program lval value to survive over a call to the
38 inferior (i.e. to be put into the history list or an internal
39 variable). */
40
41 struct value;
42
43 /* Values are stored in a chain, so that they can be deleted easily
44 over calls to the inferior. Values assigned to internal variables,
45 put into the value history or exposed to Python are taken off this
46 list. */
47
48 struct value *value_next (struct value *);
49
50 /* Type of the value. */
51
52 extern struct type *value_type (const struct value *);
53
54 /* This is being used to change the type of an existing value, that
55 code should instead be creating a new value with the changed type
56 (but possibly shared content). */
57
58 extern void deprecated_set_value_type (struct value *value,
59 struct type *type);
60
61 /* Only used for bitfields; number of bits contained in them. */
62
63 extern int value_bitsize (const struct value *);
64 extern void set_value_bitsize (struct value *, int bit);
65
66 /* Only used for bitfields; position of start of field. For
67 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
68 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
69
70 extern int value_bitpos (const struct value *);
71 extern void set_value_bitpos (struct value *, int bit);
72
73 /* Only used for bitfields; the containing value. This allows a
74 single read from the target when displaying multiple
75 bitfields. */
76
77 struct value *value_parent (struct value *);
78 extern void set_value_parent (struct value *value, struct value *parent);
79
80 /* Describes offset of a value within lval of a structure in bytes.
81 If lval == lval_memory, this is an offset to the address. If lval
82 == lval_register, this is a further offset from location.address
83 within the registers structure. Note also the member
84 embedded_offset below. */
85
86 extern int value_offset (const struct value *);
87 extern void set_value_offset (struct value *, int offset);
88
89 /* The comment from "struct value" reads: ``Is it modifiable? Only
90 relevant if lval != not_lval.''. Shouldn't the value instead be
91 not_lval and be done with it? */
92
93 extern int deprecated_value_modifiable (struct value *value);
94
95 /* If a value represents a C++ object, then the `type' field gives the
96 object's compile-time type. If the object actually belongs to some
97 class derived from `type', perhaps with other base classes and
98 additional members, then `type' is just a subobject of the real
99 thing, and the full object is probably larger than `type' would
100 suggest.
101
102 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
103 actually determine the object's run-time type by looking at the
104 run-time type information in the vtable. When this information is
105 available, we may elect to read in the entire object, for several
106 reasons:
107
108 - When printing the value, the user would probably rather see the
109 full object, not just the limited portion apparent from the
110 compile-time type.
111
112 - If `type' has virtual base classes, then even printing `type'
113 alone may require reaching outside the `type' portion of the
114 object to wherever the virtual base class has been stored.
115
116 When we store the entire object, `enclosing_type' is the run-time
117 type -- the complete object -- and `embedded_offset' is the offset
118 of `type' within that larger type, in bytes. The value_contents()
119 macro takes `embedded_offset' into account, so most GDB code
120 continues to see the `type' portion of the value, just as the
121 inferior would.
122
123 If `type' is a pointer to an object, then `enclosing_type' is a
124 pointer to the object's run-time type, and `pointed_to_offset' is
125 the offset in bytes from the full object to the pointed-to object
126 -- that is, the value `embedded_offset' would have if we followed
127 the pointer and fetched the complete object. (I don't really see
128 the point. Why not just determine the run-time type when you
129 indirect, and avoid the special case? The contents don't matter
130 until you indirect anyway.)
131
132 If we're not doing anything fancy, `enclosing_type' is equal to
133 `type', and `embedded_offset' is zero, so everything works
134 normally. */
135
136 extern struct type *value_enclosing_type (struct value *);
137 extern void set_value_enclosing_type (struct value *val,
138 struct type *new_type);
139
140 /* Returns value_type or value_enclosing_type depending on
141 value_print_options.objectprint.
142
143 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
144 only for pointers and references, else it will be returned
145 for all the types (e.g. structures). This option is useful
146 to prevent retrieving enclosing type for the base classes fields.
147
148 REAL_TYPE_FOUND is used to inform whether the real type was found
149 (or just static type was used). The NULL may be passed if it is not
150 necessary. */
151
152 extern struct type *value_actual_type (struct value *value,
153 int resolve_simple_types,
154 int *real_type_found);
155
156 extern int value_pointed_to_offset (struct value *value);
157 extern void set_value_pointed_to_offset (struct value *value, int val);
158 extern int value_embedded_offset (struct value *value);
159 extern void set_value_embedded_offset (struct value *value, int val);
160
161 /* For lval_computed values, this structure holds functions used to
162 retrieve and set the value (or portions of the value).
163
164 For each function, 'V' is the 'this' pointer: an lval_funcs
165 function F may always assume that the V it receives is an
166 lval_computed value, and has F in the appropriate slot of its
167 lval_funcs structure. */
168
169 struct lval_funcs
170 {
171 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
172 a problem arises in obtaining VALUE's bits, this function should
173 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
174 non-optimized-out value is an internal error. */
175 void (*read) (struct value *v);
176
177 /* Handle an assignment TOVAL = FROMVAL by writing the value of
178 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
179 been updated. If a problem arises in doing so, this function
180 should call 'error'. If it is NULL such TOVAL assignment is an error as
181 TOVAL is not considered as an lvalue. */
182 void (*write) (struct value *toval, struct value *fromval);
183
184 /* Check the validity of some bits in VALUE. This should return 1
185 if all the bits starting at OFFSET and extending for LENGTH bits
186 are valid, or 0 if any bit is invalid. */
187 int (*check_validity) (const struct value *value, int offset, int length);
188
189 /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid. */
190 int (*check_any_valid) (const struct value *value);
191
192 /* If non-NULL, this is used to implement pointer indirection for
193 this value. This method may return NULL, in which case value_ind
194 will fall back to ordinary indirection. */
195 struct value *(*indirect) (struct value *value);
196
197 /* If non-NULL, this is used to implement reference resolving for
198 this value. This method may return NULL, in which case coerce_ref
199 will fall back to ordinary references resolving. */
200 struct value *(*coerce_ref) (const struct value *value);
201
202 /* If non-NULL, this is used to determine whether the indicated bits
203 of VALUE are a synthetic pointer. */
204 int (*check_synthetic_pointer) (const struct value *value,
205 int offset, int length);
206
207 /* Return a duplicate of VALUE's closure, for use in a new value.
208 This may simply return the same closure, if VALUE's is
209 reference-counted or statically allocated.
210
211 This may be NULL, in which case VALUE's closure is re-used in the
212 new value. */
213 void *(*copy_closure) (const struct value *v);
214
215 /* Drop VALUE's reference to its closure. Maybe this frees the
216 closure; maybe this decrements a reference count; maybe the
217 closure is statically allocated and this does nothing.
218
219 This may be NULL, in which case no action is taken to free
220 VALUE's closure. */
221 void (*free_closure) (struct value *v);
222 };
223
224 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
225 and closure CLOSURE. */
226
227 extern struct value *allocate_computed_value (struct type *type,
228 const struct lval_funcs *funcs,
229 void *closure);
230
231 /* Helper function to check the validity of some bits of a value.
232
233 If TYPE represents some aggregate type (e.g., a structure), return 1.
234
235 Otherwise, any of the bytes starting at OFFSET and extending for
236 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
237 return 0. The checking is done using FUNCS.
238
239 Otherwise, return 1. */
240
241 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
242 int embedded_offset,
243 const struct value *val);
244
245 extern struct value *allocate_optimized_out_value (struct type *type);
246
247 /* If VALUE is lval_computed, return its lval_funcs structure. */
248
249 extern const struct lval_funcs *value_computed_funcs (const struct value *);
250
251 /* If VALUE is lval_computed, return its closure. The meaning of the
252 returned value depends on the functions VALUE uses. */
253
254 extern void *value_computed_closure (const struct value *value);
255
256 /* If zero, contents of this value are in the contents field. If
257 nonzero, contents are in inferior. If the lval field is lval_memory,
258 the contents are in inferior memory at location.address plus offset.
259 The lval field may also be lval_register.
260
261 WARNING: This field is used by the code which handles watchpoints
262 (see breakpoint.c) to decide whether a particular value can be
263 watched by hardware watchpoints. If the lazy flag is set for some
264 member of a value chain, it is assumed that this member of the
265 chain doesn't need to be watched as part of watching the value
266 itself. This is how GDB avoids watching the entire struct or array
267 when the user wants to watch a single struct member or array
268 element. If you ever change the way lazy flag is set and reset, be
269 sure to consider this use as well! */
270
271 extern int value_lazy (struct value *);
272 extern void set_value_lazy (struct value *value, int val);
273
274 extern int value_stack (struct value *);
275 extern void set_value_stack (struct value *value, int val);
276
277 /* Throw an error complaining that the value has been optimized
278 out. */
279
280 extern void error_value_optimized_out (void);
281
282 /* value_contents() and value_contents_raw() both return the address
283 of the gdb buffer used to hold a copy of the contents of the lval.
284 value_contents() is used when the contents of the buffer are needed
285 -- it uses value_fetch_lazy() to load the buffer from the process
286 being debugged if it hasn't already been loaded
287 (value_contents_writeable() is used when a writeable but fetched
288 buffer is required).. value_contents_raw() is used when data is
289 being stored into the buffer, or when it is certain that the
290 contents of the buffer are valid.
291
292 Note: The contents pointer is adjusted by the offset required to
293 get to the real subobject, if the value happens to represent
294 something embedded in a larger run-time object. */
295
296 extern gdb_byte *value_contents_raw (struct value *);
297
298 /* Actual contents of the value. For use of this value; setting it
299 uses the stuff above. Not valid if lazy is nonzero. Target
300 byte-order. We force it to be aligned properly for any possible
301 value. Note that a value therefore extends beyond what is
302 declared here. */
303
304 extern const gdb_byte *value_contents (struct value *);
305 extern gdb_byte *value_contents_writeable (struct value *);
306
307 /* The ALL variants of the above two macros do not adjust the returned
308 pointer by the embedded_offset value. */
309
310 extern gdb_byte *value_contents_all_raw (struct value *);
311 extern const gdb_byte *value_contents_all (struct value *);
312
313 /* Like value_contents_all, but does not require that the returned
314 bits be valid. This should only be used in situations where you
315 plan to check the validity manually. */
316 extern const gdb_byte *value_contents_for_printing (struct value *value);
317
318 /* Like value_contents_for_printing, but accepts a constant value
319 pointer. Unlike value_contents_for_printing however, the pointed
320 value must _not_ be lazy. */
321 extern const gdb_byte *
322 value_contents_for_printing_const (const struct value *value);
323
324 extern int value_fetch_lazy (struct value *val);
325
326 /* If nonzero, this is the value of a variable which does not actually
327 exist in the program, at least partially. If the value is lazy,
328 this may fetch it now. */
329 extern int value_optimized_out (struct value *value);
330 extern void set_value_optimized_out (struct value *value, int val);
331
332 /* Like value_optimized_out, but don't fetch the value even if it is
333 lazy. Mainly useful for constructing other values using VALUE as
334 template. */
335 extern int value_optimized_out_const (const struct value *value);
336
337 /* Like value_optimized_out, but return false if any bit in the object
338 is valid. */
339 extern int value_entirely_optimized_out (const struct value *value);
340
341 /* Set or return field indicating whether a variable is initialized or
342 not, based on debugging information supplied by the compiler.
343 1 = initialized; 0 = uninitialized. */
344 extern int value_initialized (struct value *);
345 extern void set_value_initialized (struct value *, int);
346
347 /* Set COMPONENT's location as appropriate for a component of WHOLE
348 --- regardless of what kind of lvalue WHOLE is. */
349 extern void set_value_component_location (struct value *component,
350 const struct value *whole);
351
352 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
353 single value might have multiple LVALs), this hacked interface is
354 limited to just the first PIECE. Expect further change. */
355 /* Type of value; either not an lval, or one of the various different
356 possible kinds of lval. */
357 extern enum lval_type *deprecated_value_lval_hack (struct value *);
358 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
359
360 /* Like VALUE_LVAL, except the parameter can be const. */
361 extern enum lval_type value_lval_const (const struct value *value);
362
363 /* If lval == lval_memory, return the address in the inferior. If
364 lval == lval_register, return the byte offset into the registers
365 structure. Otherwise, return 0. The returned address
366 includes the offset, if any. */
367 extern CORE_ADDR value_address (const struct value *);
368
369 /* Like value_address, except the result does not include value's
370 offset. */
371 extern CORE_ADDR value_raw_address (struct value *);
372
373 /* Set the address of a value. */
374 extern void set_value_address (struct value *, CORE_ADDR);
375
376 /* Pointer to internal variable. */
377 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
378 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
379
380 /* Frame register value is relative to. This will be described in the
381 lval enum above as "lval_register". */
382 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
383 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
384
385 /* Register number if the value is from a register. */
386 extern short *deprecated_value_regnum_hack (struct value *);
387 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
388
389 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
390 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
391
392 extern struct value *coerce_ref_if_computed (const struct value *arg);
393
394 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
395 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
396 ORIGINAL_VAL are the type and value of the original reference or pointer.
397
398 Note, that VALUE is modified by this function.
399
400 It is a common implementation for coerce_ref and value_ind. */
401
402 extern struct value * readjust_indirect_value_type (struct value *value,
403 struct type *enc_type,
404 struct type *original_type,
405 struct value *original_val);
406
407 /* Convert a REF to the object referenced. */
408
409 extern struct value *coerce_ref (struct value *value);
410
411 /* If ARG is an array, convert it to a pointer.
412 If ARG is a function, convert it to a function pointer.
413
414 References are dereferenced. */
415
416 extern struct value *coerce_array (struct value *value);
417
418 /* Given a value, determine whether the bits starting at OFFSET and
419 extending for LENGTH bits are valid. This returns nonzero if all
420 bits in the given range are valid, zero if any bit is invalid. */
421
422 extern int value_bits_valid (const struct value *value,
423 int offset, int length);
424
425 /* Given a value, determine whether the bits starting at OFFSET and
426 extending for LENGTH bits are a synthetic pointer. */
427
428 extern int value_bits_synthetic_pointer (const struct value *value,
429 int offset, int length);
430
431 /* Given a value, determine whether the contents bytes starting at
432 OFFSET and extending for LENGTH bytes are available. This returns
433 nonzero if all bytes in the given range are available, zero if any
434 byte is unavailable. */
435
436 extern int value_bytes_available (const struct value *value,
437 int offset, int length);
438
439 /* Given a value, determine whether the contents bits starting at
440 OFFSET and extending for LENGTH bits are available. This returns
441 nonzero if all bits in the given range are available, zero if any
442 bit is unavailable. */
443
444 extern int value_bits_available (const struct value *value,
445 int offset, int length);
446
447 /* Like value_bytes_available, but return false if any byte in the
448 whole object is unavailable. */
449 extern int value_entirely_available (struct value *value);
450
451 /* Like value_entirely_available, but return false if any byte in the
452 whole object is available. */
453 extern int value_entirely_unavailable (struct value *value);
454
455 /* Mark VALUE's content bytes starting at OFFSET and extending for
456 LENGTH bytes as unavailable. */
457
458 extern void mark_value_bytes_unavailable (struct value *value,
459 int offset, int length);
460
461 /* Mark VALUE's content bits starting at OFFSET and extending for
462 LENGTH bits as unavailable. */
463
464 extern void mark_value_bits_unavailable (struct value *value,
465 int offset, int length);
466
467 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
468 LENGTH bytes of VAL2's contents starting at OFFSET2.
469
470 Note that "contents" refers to the whole value's contents
471 (value_contents_all), without any embedded offset adjustment. For
472 example, to compare a complete object value with itself, including
473 its enclosing type chunk, you'd do:
474
475 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
476 value_available_contents (val, 0, val, 0, len);
477
478 Returns true iff the set of available contents match. Unavailable
479 contents compare equal with unavailable contents, and different
480 with any available byte. For example, if 'x's represent an
481 unavailable byte, and 'V' and 'Z' represent different available
482 bytes, in a value with length 16:
483
484 offset: 0 4 8 12 16
485 contents: xxxxVVVVxxxxVVZZ
486
487 then:
488
489 value_available_contents_eq(val, 0, val, 8, 6) => 1
490 value_available_contents_eq(val, 0, val, 4, 4) => 1
491 value_available_contents_eq(val, 0, val, 8, 8) => 0
492 value_available_contents_eq(val, 4, val, 12, 2) => 1
493 value_available_contents_eq(val, 4, val, 12, 4) => 0
494 value_available_contents_eq(val, 3, val, 4, 4) => 0
495
496 We only know whether a value chunk is available if we've tried to
497 read it. As this routine is used by printing routines, which may
498 be printing values in the value history, long after the inferior is
499 gone, it works with const values. Therefore, this routine must not
500 be called with lazy values. */
501
502 extern int value_available_contents_eq (const struct value *val1, int offset1,
503 const struct value *val2, int offset2,
504 int length);
505
506 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
507 is (or will be copied to) VAL's contents buffer offset by
508 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
509 Marks value contents ranges as unavailable if the corresponding
510 memory is likewise unavailable. STACK indicates whether the memory
511 is known to be stack memory. */
512
513 extern void read_value_memory (struct value *val, int embedded_offset,
514 int stack, CORE_ADDR memaddr,
515 gdb_byte *buffer, size_t length);
516
517 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
518 into each element of a new vector value with VECTOR_TYPE. */
519
520 struct value *value_vector_widen (struct value *scalar_value,
521 struct type *vector_type);
522
523 \f
524
525 #include "symtab.h"
526 #include "gdbtypes.h"
527 #include "expression.h"
528
529 struct frame_info;
530 struct fn_field;
531
532 extern int print_address_demangle (const struct value_print_options *,
533 struct gdbarch *, CORE_ADDR,
534 struct ui_file *, int);
535
536 extern LONGEST value_as_long (struct value *val);
537 extern DOUBLEST value_as_double (struct value *val);
538 extern CORE_ADDR value_as_address (struct value *val);
539
540 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
541 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
542 int *invp);
543 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
544
545 extern int unpack_value_bits_as_long (struct type *field_type,
546 const gdb_byte *valaddr,
547 int embedded_offset, int bitpos,
548 int bitsize,
549 const struct value *original_value,
550 LONGEST *result);
551
552 extern LONGEST unpack_field_as_long (struct type *type,
553 const gdb_byte *valaddr,
554 int fieldno);
555 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
556 int embedded_offset, int fieldno,
557 const struct value *val, LONGEST *result);
558
559 extern struct value *value_field_bitfield (struct type *type, int fieldno,
560 const gdb_byte *valaddr,
561 int embedded_offset,
562 const struct value *val);
563
564 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
565
566 extern struct value *value_from_longest (struct type *type, LONGEST num);
567 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
568 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
569 extern struct value *value_from_double (struct type *type, DOUBLEST num);
570 extern struct value *value_from_decfloat (struct type *type,
571 const gdb_byte *decbytes);
572 extern struct value *value_from_history_ref (char *, char **);
573
574 extern struct value *value_at (struct type *type, CORE_ADDR addr);
575 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
576
577 extern struct value *value_from_contents_and_address_unresolved
578 (struct type *, const gdb_byte *, CORE_ADDR);
579 extern struct value *value_from_contents_and_address (struct type *,
580 const gdb_byte *,
581 CORE_ADDR);
582 extern struct value *value_from_contents (struct type *, const gdb_byte *);
583
584 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
585 struct type *type,
586 int regnum,
587 struct frame_id frame_id);
588
589 extern void read_frame_register_value (struct value *value,
590 struct frame_info *frame);
591
592 extern struct value *value_from_register (struct type *type, int regnum,
593 struct frame_info *frame);
594
595 extern CORE_ADDR address_from_register (int regnum,
596 struct frame_info *frame);
597
598 extern struct value *value_of_variable (struct symbol *var,
599 const struct block *b);
600
601 extern struct value *address_of_variable (struct symbol *var,
602 const struct block *b);
603
604 extern struct value *value_of_register (int regnum, struct frame_info *frame);
605
606 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
607
608 extern int symbol_read_needs_frame (struct symbol *);
609
610 extern struct value *read_var_value (struct symbol *var,
611 struct frame_info *frame);
612
613 extern struct value *default_read_var_value (struct symbol *var,
614 struct frame_info *frame);
615
616 extern struct value *allocate_value (struct type *type);
617 extern struct value *allocate_value_lazy (struct type *type);
618 extern void value_contents_copy (struct value *dst, int dst_offset,
619 struct value *src, int src_offset,
620 int length);
621 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
622 struct value *src, int src_offset,
623 int length);
624
625 extern struct value *allocate_repeat_value (struct type *type, int count);
626
627 extern struct value *value_mark (void);
628
629 extern void value_free_to_mark (struct value *mark);
630
631 extern struct value *value_cstring (char *ptr, ssize_t len,
632 struct type *char_type);
633 extern struct value *value_string (char *ptr, ssize_t len,
634 struct type *char_type);
635
636 extern struct value *value_array (int lowbound, int highbound,
637 struct value **elemvec);
638
639 extern struct value *value_concat (struct value *arg1, struct value *arg2);
640
641 extern struct value *value_binop (struct value *arg1, struct value *arg2,
642 enum exp_opcode op);
643
644 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
645
646 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
647
648 extern int value_must_coerce_to_target (struct value *arg1);
649
650 extern struct value *value_coerce_to_target (struct value *arg1);
651
652 extern struct value *value_coerce_array (struct value *arg1);
653
654 extern struct value *value_coerce_function (struct value *arg1);
655
656 extern struct value *value_ind (struct value *arg1);
657
658 extern struct value *value_addr (struct value *arg1);
659
660 extern struct value *value_ref (struct value *arg1);
661
662 extern struct value *value_assign (struct value *toval,
663 struct value *fromval);
664
665 extern struct value *value_pos (struct value *arg1);
666
667 extern struct value *value_neg (struct value *arg1);
668
669 extern struct value *value_complement (struct value *arg1);
670
671 extern struct value *value_struct_elt (struct value **argp,
672 struct value **args,
673 const char *name, int *static_memfuncp,
674 const char *err);
675
676 extern struct value *value_struct_elt_bitpos (struct value **argp,
677 int bitpos,
678 struct type *field_type,
679 const char *err);
680
681 extern struct value *value_aggregate_elt (struct type *curtype,
682 const char *name,
683 struct type *expect_type,
684 int want_address,
685 enum noside noside);
686
687 extern struct value *value_static_field (struct type *type, int fieldno);
688
689 enum oload_search_type { NON_METHOD, METHOD, BOTH };
690
691 extern int find_overload_match (struct value **args, int nargs,
692 const char *name,
693 enum oload_search_type method,
694 struct value **objp, struct symbol *fsym,
695 struct value **valp, struct symbol **symp,
696 int *staticp, const int no_adl);
697
698 extern struct value *value_field (struct value *arg1, int fieldno);
699
700 extern struct value *value_primitive_field (struct value *arg1, int offset,
701 int fieldno,
702 struct type *arg_type);
703
704
705 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
706 int *);
707
708 extern struct value *value_full_object (struct value *, struct type *, int,
709 int, int);
710
711 extern struct value *value_cast_pointers (struct type *, struct value *, int);
712
713 extern struct value *value_cast (struct type *type, struct value *arg2);
714
715 extern struct value *value_reinterpret_cast (struct type *type,
716 struct value *arg);
717
718 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
719
720 extern struct value *value_zero (struct type *type, enum lval_type lv);
721
722 extern struct value *value_one (struct type *type);
723
724 extern struct value *value_repeat (struct value *arg1, int count);
725
726 extern struct value *value_subscript (struct value *array, LONGEST index);
727
728 extern struct value *value_bitstring_subscript (struct type *type,
729 struct value *bitstring,
730 LONGEST index);
731
732 extern struct value *register_value_being_returned (struct type *valtype,
733 struct regcache *retbuf);
734
735 extern int value_in (struct value *element, struct value *set);
736
737 extern int value_bit_index (struct type *type, const gdb_byte *addr,
738 int index);
739
740 extern enum return_value_convention
741 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
742 struct type *value_type);
743
744 extern int using_struct_return (struct gdbarch *gdbarch,
745 struct value *function,
746 struct type *value_type);
747
748 extern struct value *evaluate_expression (struct expression *exp);
749
750 extern struct value *evaluate_type (struct expression *exp);
751
752 extern struct value *evaluate_subexp (struct type *expect_type,
753 struct expression *exp,
754 int *pos, enum noside noside);
755
756 extern struct value *evaluate_subexpression_type (struct expression *exp,
757 int subexp);
758
759 extern void fetch_subexp_value (struct expression *exp, int *pc,
760 struct value **valp, struct value **resultp,
761 struct value **val_chain,
762 int preserve_errors);
763
764 extern char *extract_field_op (struct expression *exp, int *subexp);
765
766 extern struct value *evaluate_subexp_with_coercion (struct expression *,
767 int *, enum noside);
768
769 extern struct value *parse_and_eval (const char *exp);
770
771 extern struct value *parse_to_comma_and_eval (const char **expp);
772
773 extern struct type *parse_and_eval_type (char *p, int length);
774
775 extern CORE_ADDR parse_and_eval_address (const char *exp);
776
777 extern LONGEST parse_and_eval_long (const char *exp);
778
779 extern void unop_promote (const struct language_defn *language,
780 struct gdbarch *gdbarch,
781 struct value **arg1);
782
783 extern void binop_promote (const struct language_defn *language,
784 struct gdbarch *gdbarch,
785 struct value **arg1, struct value **arg2);
786
787 extern struct value *access_value_history (int num);
788
789 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
790 struct internalvar *var);
791
792 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
793
794 extern void set_internalvar (struct internalvar *var, struct value *val);
795
796 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
797
798 extern void set_internalvar_string (struct internalvar *var,
799 const char *string);
800
801 extern void clear_internalvar (struct internalvar *var);
802
803 extern void set_internalvar_component (struct internalvar *var,
804 int offset,
805 int bitpos, int bitsize,
806 struct value *newvalue);
807
808 extern struct internalvar *lookup_only_internalvar (const char *name);
809
810 extern struct internalvar *create_internalvar (const char *name);
811
812 extern VEC (char_ptr) *complete_internalvar (const char *name);
813
814 /* An internalvar can be dynamically computed by supplying a vector of
815 function pointers to perform various operations. */
816
817 struct internalvar_funcs
818 {
819 /* Compute the value of the variable. The DATA argument passed to
820 the function is the same argument that was passed to
821 `create_internalvar_type_lazy'. */
822
823 struct value *(*make_value) (struct gdbarch *arch,
824 struct internalvar *var,
825 void *data);
826
827 /* Update the agent expression EXPR with bytecode to compute the
828 value. VALUE is the agent value we are updating. The DATA
829 argument passed to this function is the same argument that was
830 passed to `create_internalvar_type_lazy'. If this pointer is
831 NULL, then the internalvar cannot be compiled to an agent
832 expression. */
833
834 void (*compile_to_ax) (struct internalvar *var,
835 struct agent_expr *expr,
836 struct axs_value *value,
837 void *data);
838
839 /* If non-NULL, this is called to destroy DATA. The DATA argument
840 passed to this function is the same argument that was passed to
841 `create_internalvar_type_lazy'. */
842
843 void (*destroy) (void *data);
844 };
845
846 extern struct internalvar *create_internalvar_type_lazy (const char *name,
847 const struct internalvar_funcs *funcs,
848 void *data);
849
850 /* Compile an internal variable to an agent expression. VAR is the
851 variable to compile; EXPR and VALUE are the agent expression we are
852 updating. This will return 0 if there is no known way to compile
853 VAR, and 1 if VAR was successfully compiled. It may also throw an
854 exception on error. */
855
856 extern int compile_internalvar_to_ax (struct internalvar *var,
857 struct agent_expr *expr,
858 struct axs_value *value);
859
860 extern struct internalvar *lookup_internalvar (const char *name);
861
862 extern int value_equal (struct value *arg1, struct value *arg2);
863
864 extern int value_equal_contents (struct value *arg1, struct value *arg2);
865
866 extern int value_less (struct value *arg1, struct value *arg2);
867
868 extern int value_logical_not (struct value *arg1);
869
870 /* C++ */
871
872 extern struct value *value_of_this (const struct language_defn *lang);
873
874 extern struct value *value_of_this_silent (const struct language_defn *lang);
875
876 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
877 enum exp_opcode op,
878 enum exp_opcode otherop,
879 enum noside noside);
880
881 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
882 enum noside noside);
883
884 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
885 int j, struct type *type, int offset);
886
887 extern int binop_types_user_defined_p (enum exp_opcode op,
888 struct type *type1,
889 struct type *type2);
890
891 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
892 struct value *arg2);
893
894 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
895
896 extern int destructor_name_p (const char *name, struct type *type);
897
898 extern void value_incref (struct value *val);
899
900 extern void value_free (struct value *val);
901
902 extern void free_all_values (void);
903
904 extern void free_value_chain (struct value *v);
905
906 extern void release_value (struct value *val);
907
908 extern void release_value_or_incref (struct value *val);
909
910 extern int record_latest_value (struct value *val);
911
912 extern void modify_field (struct type *type, gdb_byte *addr,
913 LONGEST fieldval, int bitpos, int bitsize);
914
915 extern void type_print (struct type *type, const char *varstring,
916 struct ui_file *stream, int show);
917
918 extern char *type_to_string (struct type *type);
919
920 extern gdb_byte *baseclass_addr (struct type *type, int index,
921 gdb_byte *valaddr,
922 struct value **valuep, int *errp);
923
924 extern void print_longest (struct ui_file *stream, int format,
925 int use_local, LONGEST val);
926
927 extern void print_floating (const gdb_byte *valaddr, struct type *type,
928 struct ui_file *stream);
929
930 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
931 struct ui_file *stream);
932
933 extern void value_print (struct value *val, struct ui_file *stream,
934 const struct value_print_options *options);
935
936 extern void value_print_array_elements (struct value *val,
937 struct ui_file *stream, int format,
938 enum val_prettyformat pretty);
939
940 extern struct value *value_release_to_mark (struct value *mark);
941
942 extern void val_print (struct type *type, const gdb_byte *valaddr,
943 int embedded_offset, CORE_ADDR address,
944 struct ui_file *stream, int recurse,
945 const struct value *val,
946 const struct value_print_options *options,
947 const struct language_defn *language);
948
949 extern void common_val_print (struct value *val,
950 struct ui_file *stream, int recurse,
951 const struct value_print_options *options,
952 const struct language_defn *language);
953
954 extern int val_print_string (struct type *elttype, const char *encoding,
955 CORE_ADDR addr, int len,
956 struct ui_file *stream,
957 const struct value_print_options *options);
958
959 extern void print_variable_and_value (const char *name,
960 struct symbol *var,
961 struct frame_info *frame,
962 struct ui_file *stream,
963 int indent);
964
965 extern void typedef_print (struct type *type, struct symbol *news,
966 struct ui_file *stream);
967
968 extern char *internalvar_name (struct internalvar *var);
969
970 extern void preserve_values (struct objfile *);
971
972 /* From values.c */
973
974 extern struct value *value_copy (struct value *);
975
976 extern struct value *value_non_lval (struct value *);
977
978 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
979
980 /* From valops.c */
981
982 extern struct value *varying_to_slice (struct value *);
983
984 extern struct value *value_slice (struct value *, int, int);
985
986 extern struct value *value_literal_complex (struct value *, struct value *,
987 struct type *);
988
989 extern struct value *find_function_in_inferior (const char *,
990 struct objfile **);
991
992 extern struct value *value_allocate_space_in_inferior (int);
993
994 extern struct value *value_subscripted_rvalue (struct value *array,
995 LONGEST index, int lowerbound);
996
997 /* User function handler. */
998
999 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
1000 const struct language_defn *language,
1001 void *cookie,
1002 int argc,
1003 struct value **argv);
1004
1005 void add_internal_function (const char *name, const char *doc,
1006 internal_function_fn handler,
1007 void *cookie);
1008
1009 struct value *call_internal_function (struct gdbarch *gdbarch,
1010 const struct language_defn *language,
1011 struct value *function,
1012 int argc, struct value **argv);
1013
1014 char *value_internal_function_name (struct value *);
1015
1016 extern struct value *value_of_xmethod (struct xmethod_worker *);
1017
1018 struct value *call_xmethod (struct value *function,
1019 int argc, struct value **argv);
1020
1021 #endif /* !defined (VALUE_H) */