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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
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 /* Throw an error complaining that the value has been optimized
277 out. */
278
279 extern void error_value_optimized_out (void);
280
281 /* value_contents() and value_contents_raw() both return the address
282 of the gdb buffer used to hold a copy of the contents of the lval.
283 value_contents() is used when the contents of the buffer are needed
284 -- it uses value_fetch_lazy() to load the buffer from the process
285 being debugged if it hasn't already been loaded
286 (value_contents_writeable() is used when a writeable but fetched
287 buffer is required).. value_contents_raw() is used when data is
288 being stored into the buffer, or when it is certain that the
289 contents of the buffer are valid.
290
291 Note: The contents pointer is adjusted by the offset required to
292 get to the real subobject, if the value happens to represent
293 something embedded in a larger run-time object. */
294
295 extern gdb_byte *value_contents_raw (struct value *);
296
297 /* Actual contents of the value. For use of this value; setting it
298 uses the stuff above. Not valid if lazy is nonzero. Target
299 byte-order. We force it to be aligned properly for any possible
300 value. Note that a value therefore extends beyond what is
301 declared here. */
302
303 extern const gdb_byte *value_contents (struct value *);
304 extern gdb_byte *value_contents_writeable (struct value *);
305
306 /* The ALL variants of the above two macros do not adjust the returned
307 pointer by the embedded_offset value. */
308
309 extern gdb_byte *value_contents_all_raw (struct value *);
310 extern const gdb_byte *value_contents_all (struct value *);
311
312 /* Like value_contents_all, but does not require that the returned
313 bits be valid. This should only be used in situations where you
314 plan to check the validity manually. */
315 extern const gdb_byte *value_contents_for_printing (struct value *value);
316
317 /* Like value_contents_for_printing, but accepts a constant value
318 pointer. Unlike value_contents_for_printing however, the pointed
319 value must _not_ be lazy. */
320 extern const gdb_byte *
321 value_contents_for_printing_const (const struct value *value);
322
323 extern int value_fetch_lazy (struct value *val);
324 extern int value_contents_equal (struct value *val1, struct value *val2);
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 (struct type *,
578 const gdb_byte *,
579 CORE_ADDR);
580 extern struct value *value_from_contents (struct type *, const gdb_byte *);
581
582 extern struct value *default_value_from_register (struct type *type,
583 int regnum,
584 struct frame_info *frame);
585
586 extern void read_frame_register_value (struct value *value,
587 struct frame_info *frame);
588
589 extern struct value *value_from_register (struct type *type, int regnum,
590 struct frame_info *frame);
591
592 extern CORE_ADDR address_from_register (struct type *type, int regnum,
593 struct frame_info *frame);
594
595 extern struct value *value_of_variable (struct symbol *var,
596 const struct block *b);
597
598 extern struct value *address_of_variable (struct symbol *var,
599 const struct block *b);
600
601 extern struct value *value_of_register (int regnum, struct frame_info *frame);
602
603 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
604
605 extern int symbol_read_needs_frame (struct symbol *);
606
607 extern struct value *read_var_value (struct symbol *var,
608 struct frame_info *frame);
609
610 extern struct value *default_read_var_value (struct symbol *var,
611 struct frame_info *frame);
612
613 extern struct value *allocate_value (struct type *type);
614 extern struct value *allocate_value_lazy (struct type *type);
615 extern void value_contents_copy (struct value *dst, int dst_offset,
616 struct value *src, int src_offset,
617 int length);
618 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
619 struct value *src, int src_offset,
620 int length);
621
622 extern struct value *allocate_repeat_value (struct type *type, int count);
623
624 extern struct value *value_mark (void);
625
626 extern void value_free_to_mark (struct value *mark);
627
628 extern struct value *value_cstring (char *ptr, ssize_t len,
629 struct type *char_type);
630 extern struct value *value_string (char *ptr, ssize_t len,
631 struct type *char_type);
632
633 extern struct value *value_array (int lowbound, int highbound,
634 struct value **elemvec);
635
636 extern struct value *value_concat (struct value *arg1, struct value *arg2);
637
638 extern struct value *value_binop (struct value *arg1, struct value *arg2,
639 enum exp_opcode op);
640
641 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
642
643 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
644
645 extern int value_must_coerce_to_target (struct value *arg1);
646
647 extern struct value *value_coerce_to_target (struct value *arg1);
648
649 extern struct value *value_coerce_array (struct value *arg1);
650
651 extern struct value *value_coerce_function (struct value *arg1);
652
653 extern struct value *value_ind (struct value *arg1);
654
655 extern struct value *value_addr (struct value *arg1);
656
657 extern struct value *value_ref (struct value *arg1);
658
659 extern struct value *value_assign (struct value *toval,
660 struct value *fromval);
661
662 extern struct value *value_pos (struct value *arg1);
663
664 extern struct value *value_neg (struct value *arg1);
665
666 extern struct value *value_complement (struct value *arg1);
667
668 extern struct value *value_struct_elt (struct value **argp,
669 struct value **args,
670 const char *name, int *static_memfuncp,
671 const char *err);
672
673 extern struct value *value_struct_elt_bitpos (struct value **argp,
674 int bitpos,
675 struct type *field_type,
676 const char *err);
677
678 extern struct value *value_aggregate_elt (struct type *curtype,
679 const char *name,
680 struct type *expect_type,
681 int want_address,
682 enum noside noside);
683
684 extern struct value *value_static_field (struct type *type, int fieldno);
685
686 enum oload_search_type { NON_METHOD, METHOD, BOTH };
687
688 extern int find_overload_match (struct value **args, int nargs,
689 const char *name,
690 enum oload_search_type method,
691 struct value **objp, struct symbol *fsym,
692 struct value **valp, struct symbol **symp,
693 int *staticp, const int no_adl);
694
695 extern struct value *value_field (struct value *arg1, int fieldno);
696
697 extern struct value *value_primitive_field (struct value *arg1, int offset,
698 int fieldno,
699 struct type *arg_type);
700
701
702 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
703 int *);
704
705 extern struct value *value_full_object (struct value *, struct type *, int,
706 int, int);
707
708 extern struct value *value_cast_pointers (struct type *, struct value *, int);
709
710 extern struct value *value_cast (struct type *type, struct value *arg2);
711
712 extern struct value *value_reinterpret_cast (struct type *type,
713 struct value *arg);
714
715 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
716
717 extern struct value *value_zero (struct type *type, enum lval_type lv);
718
719 extern struct value *value_one (struct type *type);
720
721 extern struct value *value_repeat (struct value *arg1, int count);
722
723 extern struct value *value_subscript (struct value *array, LONGEST index);
724
725 extern struct value *value_bitstring_subscript (struct type *type,
726 struct value *bitstring,
727 LONGEST index);
728
729 extern struct value *register_value_being_returned (struct type *valtype,
730 struct regcache *retbuf);
731
732 extern int value_in (struct value *element, struct value *set);
733
734 extern int value_bit_index (struct type *type, const gdb_byte *addr,
735 int index);
736
737 extern enum return_value_convention
738 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
739 struct type *value_type);
740
741 extern int using_struct_return (struct gdbarch *gdbarch,
742 struct value *function,
743 struct type *value_type);
744
745 extern struct value *evaluate_expression (struct expression *exp);
746
747 extern struct value *evaluate_type (struct expression *exp);
748
749 extern struct value *evaluate_subexp (struct type *expect_type,
750 struct expression *exp,
751 int *pos, enum noside noside);
752
753 extern struct value *evaluate_subexpression_type (struct expression *exp,
754 int subexp);
755
756 extern void fetch_subexp_value (struct expression *exp, int *pc,
757 struct value **valp, struct value **resultp,
758 struct value **val_chain,
759 int preserve_errors);
760
761 extern char *extract_field_op (struct expression *exp, int *subexp);
762
763 extern struct value *evaluate_subexp_with_coercion (struct expression *,
764 int *, enum noside);
765
766 extern struct value *parse_and_eval (const char *exp);
767
768 extern struct value *parse_to_comma_and_eval (const char **expp);
769
770 extern struct type *parse_and_eval_type (char *p, int length);
771
772 extern CORE_ADDR parse_and_eval_address (const char *exp);
773
774 extern LONGEST parse_and_eval_long (const char *exp);
775
776 extern void unop_promote (const struct language_defn *language,
777 struct gdbarch *gdbarch,
778 struct value **arg1);
779
780 extern void binop_promote (const struct language_defn *language,
781 struct gdbarch *gdbarch,
782 struct value **arg1, struct value **arg2);
783
784 extern struct value *access_value_history (int num);
785
786 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
787 struct internalvar *var);
788
789 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
790
791 extern void set_internalvar (struct internalvar *var, struct value *val);
792
793 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
794
795 extern void set_internalvar_string (struct internalvar *var,
796 const char *string);
797
798 extern void clear_internalvar (struct internalvar *var);
799
800 extern void set_internalvar_component (struct internalvar *var,
801 int offset,
802 int bitpos, int bitsize,
803 struct value *newvalue);
804
805 extern struct internalvar *lookup_only_internalvar (const char *name);
806
807 extern struct internalvar *create_internalvar (const char *name);
808
809 extern VEC (char_ptr) *complete_internalvar (const char *name);
810
811 /* An internalvar can be dynamically computed by supplying a vector of
812 function pointers to perform various operations. */
813
814 struct internalvar_funcs
815 {
816 /* Compute the value of the variable. The DATA argument passed to
817 the function is the same argument that was passed to
818 `create_internalvar_type_lazy'. */
819
820 struct value *(*make_value) (struct gdbarch *arch,
821 struct internalvar *var,
822 void *data);
823
824 /* Update the agent expression EXPR with bytecode to compute the
825 value. VALUE is the agent value we are updating. The DATA
826 argument passed to this function is the same argument that was
827 passed to `create_internalvar_type_lazy'. If this pointer is
828 NULL, then the internalvar cannot be compiled to an agent
829 expression. */
830
831 void (*compile_to_ax) (struct internalvar *var,
832 struct agent_expr *expr,
833 struct axs_value *value,
834 void *data);
835
836 /* If non-NULL, this is called to destroy DATA. The DATA argument
837 passed to this function is the same argument that was passed to
838 `create_internalvar_type_lazy'. */
839
840 void (*destroy) (void *data);
841 };
842
843 extern struct internalvar *create_internalvar_type_lazy (const char *name,
844 const struct internalvar_funcs *funcs,
845 void *data);
846
847 /* Compile an internal variable to an agent expression. VAR is the
848 variable to compile; EXPR and VALUE are the agent expression we are
849 updating. This will return 0 if there is no known way to compile
850 VAR, and 1 if VAR was successfully compiled. It may also throw an
851 exception on error. */
852
853 extern int compile_internalvar_to_ax (struct internalvar *var,
854 struct agent_expr *expr,
855 struct axs_value *value);
856
857 extern struct internalvar *lookup_internalvar (const char *name);
858
859 extern int value_equal (struct value *arg1, struct value *arg2);
860
861 extern int value_equal_contents (struct value *arg1, struct value *arg2);
862
863 extern int value_less (struct value *arg1, struct value *arg2);
864
865 extern int value_logical_not (struct value *arg1);
866
867 /* C++ */
868
869 extern struct value *value_of_this (const struct language_defn *lang);
870
871 extern struct value *value_of_this_silent (const struct language_defn *lang);
872
873 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
874 enum exp_opcode op,
875 enum exp_opcode otherop,
876 enum noside noside);
877
878 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
879 enum noside noside);
880
881 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
882 int j, struct type *type, int offset);
883
884 extern int binop_types_user_defined_p (enum exp_opcode op,
885 struct type *type1,
886 struct type *type2);
887
888 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
889 struct value *arg2);
890
891 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
892
893 extern int destructor_name_p (const char *name, struct type *type);
894
895 extern void value_incref (struct value *val);
896
897 extern void value_free (struct value *val);
898
899 extern void free_all_values (void);
900
901 extern void free_value_chain (struct value *v);
902
903 extern void release_value (struct value *val);
904
905 extern void release_value_or_incref (struct value *val);
906
907 extern int record_latest_value (struct value *val);
908
909 extern void modify_field (struct type *type, gdb_byte *addr,
910 LONGEST fieldval, int bitpos, int bitsize);
911
912 extern void type_print (struct type *type, const char *varstring,
913 struct ui_file *stream, int show);
914
915 extern char *type_to_string (struct type *type);
916
917 extern gdb_byte *baseclass_addr (struct type *type, int index,
918 gdb_byte *valaddr,
919 struct value **valuep, int *errp);
920
921 extern void print_longest (struct ui_file *stream, int format,
922 int use_local, LONGEST val);
923
924 extern void print_floating (const gdb_byte *valaddr, struct type *type,
925 struct ui_file *stream);
926
927 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
928 struct ui_file *stream);
929
930 extern void value_print (struct value *val, struct ui_file *stream,
931 const struct value_print_options *options);
932
933 extern void value_print_array_elements (struct value *val,
934 struct ui_file *stream, int format,
935 enum val_prettyformat pretty);
936
937 extern struct value *value_release_to_mark (struct value *mark);
938
939 extern void val_print (struct type *type, const gdb_byte *valaddr,
940 int embedded_offset, CORE_ADDR address,
941 struct ui_file *stream, int recurse,
942 const struct value *val,
943 const struct value_print_options *options,
944 const struct language_defn *language);
945
946 extern void common_val_print (struct value *val,
947 struct ui_file *stream, int recurse,
948 const struct value_print_options *options,
949 const struct language_defn *language);
950
951 extern int val_print_string (struct type *elttype, const char *encoding,
952 CORE_ADDR addr, int len,
953 struct ui_file *stream,
954 const struct value_print_options *options);
955
956 extern void print_variable_and_value (const char *name,
957 struct symbol *var,
958 struct frame_info *frame,
959 struct ui_file *stream,
960 int indent);
961
962 extern void typedef_print (struct type *type, struct symbol *news,
963 struct ui_file *stream);
964
965 extern char *internalvar_name (struct internalvar *var);
966
967 extern void preserve_values (struct objfile *);
968
969 /* From values.c */
970
971 extern struct value *value_copy (struct value *);
972
973 extern struct value *value_non_lval (struct value *);
974
975 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
976
977 /* From valops.c */
978
979 extern struct value *varying_to_slice (struct value *);
980
981 extern struct value *value_slice (struct value *, int, int);
982
983 extern struct value *value_literal_complex (struct value *, struct value *,
984 struct type *);
985
986 extern struct value *find_function_in_inferior (const char *,
987 struct objfile **);
988
989 extern struct value *value_allocate_space_in_inferior (int);
990
991 extern struct value *value_subscripted_rvalue (struct value *array,
992 LONGEST index, int lowerbound);
993
994 /* User function handler. */
995
996 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
997 const struct language_defn *language,
998 void *cookie,
999 int argc,
1000 struct value **argv);
1001
1002 void add_internal_function (const char *name, const char *doc,
1003 internal_function_fn handler,
1004 void *cookie);
1005
1006 struct value *call_internal_function (struct gdbarch *gdbarch,
1007 const struct language_defn *language,
1008 struct value *function,
1009 int argc, struct value **argv);
1010
1011 char *value_internal_function_name (struct value *);
1012
1013 #endif /* !defined (VALUE_H) */