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1 /* Definitions for values of C expressions, for GDB.
2
3 Copyright (C) 1986-2015 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 /* Values can be partially 'optimized out' and/or 'unavailable'.
37 These are distinct states and have different string representations
38 and related error strings.
39
40 'unavailable' has a specific meaning in this context. It means the
41 value exists in the program (at the machine level), but GDB has no
42 means to get to it. Such a value is normally printed as
43 <unavailable>. Examples of how to end up with an unavailable value
44 would be:
45
46 - We're inspecting a traceframe, and the memory or registers the
47 debug information says the value lives on haven't been collected.
48
49 - We're inspecting a core dump, the memory or registers the debug
50 information says the value lives aren't present in the dump
51 (that is, we have a partial/trimmed core dump, or we don't fully
52 understand/handle the core dump's format).
53
54 - We're doing live debugging, but the debug API has no means to
55 get at where the value lives in the machine, like e.g., ptrace
56 not having access to some register or register set.
57
58 - Any other similar scenario.
59
60 OTOH, "optimized out" is about what the compiler decided to generate
61 (or not generate). A chunk of a value that was optimized out does
62 not actually exist in the program. There's no way to get at it
63 short of compiling the program differently.
64
65 A register that has not been saved in a frame is likewise considered
66 optimized out, except not-saved registers have a different string
67 representation and related error strings. E.g., we'll print them as
68 <not-saved> instead of <optimized out>, as in:
69
70 (gdb) p/x $rax
71 $1 = <not saved>
72 (gdb) info registers rax
73 rax <not saved>
74
75 If the debug info describes a variable as being in such a register,
76 we'll still print the variable as <optimized out>. IOW, <not saved>
77 is reserved for inspecting registers at the machine level.
78
79 When comparing value contents, optimized out chunks, unavailable
80 chunks, and valid contents data are all considered different. See
81 value_contents_eq for more info.
82 */
83
84 /* The structure which defines the type of a value. It should never
85 be possible for a program lval value to survive over a call to the
86 inferior (i.e. to be put into the history list or an internal
87 variable). */
88
89 struct value;
90
91 /* Values are stored in a chain, so that they can be deleted easily
92 over calls to the inferior. Values assigned to internal variables,
93 put into the value history or exposed to Python are taken off this
94 list. */
95
96 struct value *value_next (struct value *);
97
98 /* Type of the value. */
99
100 extern struct type *value_type (const struct value *);
101
102 /* This is being used to change the type of an existing value, that
103 code should instead be creating a new value with the changed type
104 (but possibly shared content). */
105
106 extern void deprecated_set_value_type (struct value *value,
107 struct type *type);
108
109 /* Only used for bitfields; number of bits contained in them. */
110
111 extern int value_bitsize (const struct value *);
112 extern void set_value_bitsize (struct value *, int bit);
113
114 /* Only used for bitfields; position of start of field. For
115 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
116 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
117
118 extern int value_bitpos (const struct value *);
119 extern void set_value_bitpos (struct value *, int bit);
120
121 /* Only used for bitfields; the containing value. This allows a
122 single read from the target when displaying multiple
123 bitfields. */
124
125 struct value *value_parent (struct value *);
126 extern void set_value_parent (struct value *value, struct value *parent);
127
128 /* Describes offset of a value within lval of a structure in bytes.
129 If lval == lval_memory, this is an offset to the address. If lval
130 == lval_register, this is a further offset from location.address
131 within the registers structure. Note also the member
132 embedded_offset below. */
133
134 extern int value_offset (const struct value *);
135 extern void set_value_offset (struct value *, int offset);
136
137 /* The comment from "struct value" reads: ``Is it modifiable? Only
138 relevant if lval != not_lval.''. Shouldn't the value instead be
139 not_lval and be done with it? */
140
141 extern int deprecated_value_modifiable (struct value *value);
142
143 /* If a value represents a C++ object, then the `type' field gives the
144 object's compile-time type. If the object actually belongs to some
145 class derived from `type', perhaps with other base classes and
146 additional members, then `type' is just a subobject of the real
147 thing, and the full object is probably larger than `type' would
148 suggest.
149
150 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
151 actually determine the object's run-time type by looking at the
152 run-time type information in the vtable. When this information is
153 available, we may elect to read in the entire object, for several
154 reasons:
155
156 - When printing the value, the user would probably rather see the
157 full object, not just the limited portion apparent from the
158 compile-time type.
159
160 - If `type' has virtual base classes, then even printing `type'
161 alone may require reaching outside the `type' portion of the
162 object to wherever the virtual base class has been stored.
163
164 When we store the entire object, `enclosing_type' is the run-time
165 type -- the complete object -- and `embedded_offset' is the offset
166 of `type' within that larger type, in bytes. The value_contents()
167 macro takes `embedded_offset' into account, so most GDB code
168 continues to see the `type' portion of the value, just as the
169 inferior would.
170
171 If `type' is a pointer to an object, then `enclosing_type' is a
172 pointer to the object's run-time type, and `pointed_to_offset' is
173 the offset in bytes from the full object to the pointed-to object
174 -- that is, the value `embedded_offset' would have if we followed
175 the pointer and fetched the complete object. (I don't really see
176 the point. Why not just determine the run-time type when you
177 indirect, and avoid the special case? The contents don't matter
178 until you indirect anyway.)
179
180 If we're not doing anything fancy, `enclosing_type' is equal to
181 `type', and `embedded_offset' is zero, so everything works
182 normally. */
183
184 extern struct type *value_enclosing_type (struct value *);
185 extern void set_value_enclosing_type (struct value *val,
186 struct type *new_type);
187
188 /* Returns value_type or value_enclosing_type depending on
189 value_print_options.objectprint.
190
191 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
192 only for pointers and references, else it will be returned
193 for all the types (e.g. structures). This option is useful
194 to prevent retrieving enclosing type for the base classes fields.
195
196 REAL_TYPE_FOUND is used to inform whether the real type was found
197 (or just static type was used). The NULL may be passed if it is not
198 necessary. */
199
200 extern struct type *value_actual_type (struct value *value,
201 int resolve_simple_types,
202 int *real_type_found);
203
204 extern int value_pointed_to_offset (struct value *value);
205 extern void set_value_pointed_to_offset (struct value *value, int val);
206 extern int value_embedded_offset (struct value *value);
207 extern void set_value_embedded_offset (struct value *value, int val);
208
209 /* For lval_computed values, this structure holds functions used to
210 retrieve and set the value (or portions of the value).
211
212 For each function, 'V' is the 'this' pointer: an lval_funcs
213 function F may always assume that the V it receives is an
214 lval_computed value, and has F in the appropriate slot of its
215 lval_funcs structure. */
216
217 struct lval_funcs
218 {
219 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
220 a problem arises in obtaining VALUE's bits, this function should
221 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
222 non-optimized-out value is an internal error. */
223 void (*read) (struct value *v);
224
225 /* Handle an assignment TOVAL = FROMVAL by writing the value of
226 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
227 been updated. If a problem arises in doing so, this function
228 should call 'error'. If it is NULL such TOVAL assignment is an error as
229 TOVAL is not considered as an lvalue. */
230 void (*write) (struct value *toval, struct value *fromval);
231
232 /* If non-NULL, this is used to implement pointer indirection for
233 this value. This method may return NULL, in which case value_ind
234 will fall back to ordinary indirection. */
235 struct value *(*indirect) (struct value *value);
236
237 /* If non-NULL, this is used to implement reference resolving for
238 this value. This method may return NULL, in which case coerce_ref
239 will fall back to ordinary references resolving. */
240 struct value *(*coerce_ref) (const struct value *value);
241
242 /* If non-NULL, this is used to determine whether the indicated bits
243 of VALUE are a synthetic pointer. */
244 int (*check_synthetic_pointer) (const struct value *value,
245 int offset, int length);
246
247 /* Return a duplicate of VALUE's closure, for use in a new value.
248 This may simply return the same closure, if VALUE's is
249 reference-counted or statically allocated.
250
251 This may be NULL, in which case VALUE's closure is re-used in the
252 new value. */
253 void *(*copy_closure) (const struct value *v);
254
255 /* Drop VALUE's reference to its closure. Maybe this frees the
256 closure; maybe this decrements a reference count; maybe the
257 closure is statically allocated and this does nothing.
258
259 This may be NULL, in which case no action is taken to free
260 VALUE's closure. */
261 void (*free_closure) (struct value *v);
262 };
263
264 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
265 and closure CLOSURE. */
266
267 extern struct value *allocate_computed_value (struct type *type,
268 const struct lval_funcs *funcs,
269 void *closure);
270
271 /* Helper function to check the validity of some bits of a value.
272
273 If TYPE represents some aggregate type (e.g., a structure), return 1.
274
275 Otherwise, any of the bytes starting at OFFSET and extending for
276 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
277 return 0. The checking is done using FUNCS.
278
279 Otherwise, return 1. */
280
281 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
282 int embedded_offset,
283 const struct value *val);
284
285 extern struct value *allocate_optimized_out_value (struct type *type);
286
287 /* If VALUE is lval_computed, return its lval_funcs structure. */
288
289 extern const struct lval_funcs *value_computed_funcs (const struct value *);
290
291 /* If VALUE is lval_computed, return its closure. The meaning of the
292 returned value depends on the functions VALUE uses. */
293
294 extern void *value_computed_closure (const struct value *value);
295
296 /* If zero, contents of this value are in the contents field. If
297 nonzero, contents are in inferior. If the lval field is lval_memory,
298 the contents are in inferior memory at location.address plus offset.
299 The lval field may also be lval_register.
300
301 WARNING: This field is used by the code which handles watchpoints
302 (see breakpoint.c) to decide whether a particular value can be
303 watched by hardware watchpoints. If the lazy flag is set for some
304 member of a value chain, it is assumed that this member of the
305 chain doesn't need to be watched as part of watching the value
306 itself. This is how GDB avoids watching the entire struct or array
307 when the user wants to watch a single struct member or array
308 element. If you ever change the way lazy flag is set and reset, be
309 sure to consider this use as well! */
310
311 extern int value_lazy (struct value *);
312 extern void set_value_lazy (struct value *value, int val);
313
314 extern int value_stack (struct value *);
315 extern void set_value_stack (struct value *value, int val);
316
317 /* Throw an error complaining that the value has been optimized
318 out. */
319
320 extern void error_value_optimized_out (void);
321
322 /* value_contents() and value_contents_raw() both return the address
323 of the gdb buffer used to hold a copy of the contents of the lval.
324 value_contents() is used when the contents of the buffer are needed
325 -- it uses value_fetch_lazy() to load the buffer from the process
326 being debugged if it hasn't already been loaded
327 (value_contents_writeable() is used when a writeable but fetched
328 buffer is required).. value_contents_raw() is used when data is
329 being stored into the buffer, or when it is certain that the
330 contents of the buffer are valid.
331
332 Note: The contents pointer is adjusted by the offset required to
333 get to the real subobject, if the value happens to represent
334 something embedded in a larger run-time object. */
335
336 extern gdb_byte *value_contents_raw (struct value *);
337
338 /* Actual contents of the value. For use of this value; setting it
339 uses the stuff above. Not valid if lazy is nonzero. Target
340 byte-order. We force it to be aligned properly for any possible
341 value. Note that a value therefore extends beyond what is
342 declared here. */
343
344 extern const gdb_byte *value_contents (struct value *);
345 extern gdb_byte *value_contents_writeable (struct value *);
346
347 /* The ALL variants of the above two macros do not adjust the returned
348 pointer by the embedded_offset value. */
349
350 extern gdb_byte *value_contents_all_raw (struct value *);
351 extern const gdb_byte *value_contents_all (struct value *);
352
353 /* Like value_contents_all, but does not require that the returned
354 bits be valid. This should only be used in situations where you
355 plan to check the validity manually. */
356 extern const gdb_byte *value_contents_for_printing (struct value *value);
357
358 /* Like value_contents_for_printing, but accepts a constant value
359 pointer. Unlike value_contents_for_printing however, the pointed
360 value must _not_ be lazy. */
361 extern const gdb_byte *
362 value_contents_for_printing_const (const struct value *value);
363
364 extern int value_fetch_lazy (struct value *val);
365
366 /* If nonzero, this is the value of a variable which does not actually
367 exist in the program, at least partially. If the value is lazy,
368 this may fetch it now. */
369 extern int value_optimized_out (struct value *value);
370
371 /* Given a value, return true if any of the contents bits starting at
372 OFFSET and extending for LENGTH bits is optimized out, false
373 otherwise. */
374
375 extern int value_bits_any_optimized_out (const struct value *value,
376 int bit_offset, int bit_length);
377
378 /* Like value_optimized_out, but return true iff the whole value is
379 optimized out. */
380 extern int value_entirely_optimized_out (struct value *value);
381
382 /* Mark VALUE's content bytes starting at OFFSET and extending for
383 LENGTH bytes as optimized out. */
384
385 extern void mark_value_bytes_optimized_out (struct value *value,
386 int offset, int length);
387
388 /* Mark VALUE's content bits starting at OFFSET and extending for
389 LENGTH bits as optimized out. */
390
391 extern void mark_value_bits_optimized_out (struct value *value,
392 int offset, int length);
393
394 /* Set or return field indicating whether a variable is initialized or
395 not, based on debugging information supplied by the compiler.
396 1 = initialized; 0 = uninitialized. */
397 extern int value_initialized (struct value *);
398 extern void set_value_initialized (struct value *, int);
399
400 /* Set COMPONENT's location as appropriate for a component of WHOLE
401 --- regardless of what kind of lvalue WHOLE is. */
402 extern void set_value_component_location (struct value *component,
403 const struct value *whole);
404
405 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
406 single value might have multiple LVALs), this hacked interface is
407 limited to just the first PIECE. Expect further change. */
408 /* Type of value; either not an lval, or one of the various different
409 possible kinds of lval. */
410 extern enum lval_type *deprecated_value_lval_hack (struct value *);
411 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
412
413 /* Like VALUE_LVAL, except the parameter can be const. */
414 extern enum lval_type value_lval_const (const struct value *value);
415
416 /* If lval == lval_memory, return the address in the inferior. If
417 lval == lval_register, return the byte offset into the registers
418 structure. Otherwise, return 0. The returned address
419 includes the offset, if any. */
420 extern CORE_ADDR value_address (const struct value *);
421
422 /* Like value_address, except the result does not include value's
423 offset. */
424 extern CORE_ADDR value_raw_address (struct value *);
425
426 /* Set the address of a value. */
427 extern void set_value_address (struct value *, CORE_ADDR);
428
429 /* Pointer to internal variable. */
430 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
431 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
432
433 /* Frame register value is relative to. This will be described in the
434 lval enum above as "lval_register". */
435 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
436 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
437
438 /* Register number if the value is from a register. */
439 extern short *deprecated_value_regnum_hack (struct value *);
440 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
441
442 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
443 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
444
445 extern struct value *coerce_ref_if_computed (const struct value *arg);
446
447 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
448 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
449 ORIGINAL_VAL are the type and value of the original reference or pointer.
450
451 Note, that VALUE is modified by this function.
452
453 It is a common implementation for coerce_ref and value_ind. */
454
455 extern struct value * readjust_indirect_value_type (struct value *value,
456 struct type *enc_type,
457 struct type *original_type,
458 struct value *original_val);
459
460 /* Convert a REF to the object referenced. */
461
462 extern struct value *coerce_ref (struct value *value);
463
464 /* If ARG is an array, convert it to a pointer.
465 If ARG is a function, convert it to a function pointer.
466
467 References are dereferenced. */
468
469 extern struct value *coerce_array (struct value *value);
470
471 /* Given a value, determine whether the bits starting at OFFSET and
472 extending for LENGTH bits are a synthetic pointer. */
473
474 extern int value_bits_synthetic_pointer (const struct value *value,
475 int offset, int length);
476
477 /* Given a value, determine whether the contents bytes starting at
478 OFFSET and extending for LENGTH bytes are available. This returns
479 nonzero if all bytes in the given range are available, zero if any
480 byte is unavailable. */
481
482 extern int value_bytes_available (const struct value *value,
483 int offset, int length);
484
485 /* Given a value, determine whether the contents bits starting at
486 OFFSET and extending for LENGTH bits are available. This returns
487 nonzero if all bits in the given range are available, zero if any
488 bit is unavailable. */
489
490 extern int value_bits_available (const struct value *value,
491 int offset, int length);
492
493 /* Like value_bytes_available, but return false if any byte in the
494 whole object is unavailable. */
495 extern int value_entirely_available (struct value *value);
496
497 /* Like value_entirely_available, but return false if any byte in the
498 whole object is available. */
499 extern int value_entirely_unavailable (struct value *value);
500
501 /* Mark VALUE's content bytes starting at OFFSET and extending for
502 LENGTH bytes as unavailable. */
503
504 extern void mark_value_bytes_unavailable (struct value *value,
505 int offset, int length);
506
507 /* Mark VALUE's content bits starting at OFFSET and extending for
508 LENGTH bits as unavailable. */
509
510 extern void mark_value_bits_unavailable (struct value *value,
511 int offset, int length);
512
513 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
514 LENGTH bytes of VAL2's contents starting at OFFSET2.
515
516 Note that "contents" refers to the whole value's contents
517 (value_contents_all), without any embedded offset adjustment. For
518 example, to compare a complete object value with itself, including
519 its enclosing type chunk, you'd do:
520
521 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
522 value_contents_eq (val, 0, val, 0, len);
523
524 Returns true iff the set of available/valid contents match.
525
526 Optimized-out contents are equal to optimized-out contents, and are
527 not equal to non-optimized-out contents.
528
529 Unavailable contente are equal to unavailable contents, and are not
530 equal to non-unavailable contents.
531
532 For example, if 'x's represent an unavailable byte, and 'V' and 'Z'
533 represent different available/valid bytes, in a value with length
534 16:
535
536 offset: 0 4 8 12 16
537 contents: xxxxVVVVxxxxVVZZ
538
539 then:
540
541 value_contents_eq(val, 0, val, 8, 6) => 1
542 value_contents_eq(val, 0, val, 4, 4) => 0
543 value_contents_eq(val, 0, val, 8, 8) => 0
544 value_contents_eq(val, 4, val, 12, 2) => 1
545 value_contents_eq(val, 4, val, 12, 4) => 0
546 value_contents_eq(val, 3, val, 4, 4) => 0
547
548 If 'x's represent an unavailable byte, 'o' represents an optimized
549 out byte, in a value with length 8:
550
551 offset: 0 4 8
552 contents: xxxxoooo
553
554 then:
555
556 value_contents_eq(val, 0, val, 2, 2) => 1
557 value_contents_eq(val, 4, val, 6, 2) => 1
558 value_contents_eq(val, 0, val, 4, 4) => 0
559
560 We only know whether a value chunk is unavailable or optimized out
561 if we've tried to read it. As this routine is used by printing
562 routines, which may be printing values in the value history, long
563 after the inferior is gone, it works with const values. Therefore,
564 this routine must not be called with lazy values. */
565
566 extern int value_contents_eq (const struct value *val1, int offset1,
567 const struct value *val2, int offset2,
568 int length);
569
570 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
571 is (or will be copied to) VAL's contents buffer offset by
572 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
573 Marks value contents ranges as unavailable if the corresponding
574 memory is likewise unavailable. STACK indicates whether the memory
575 is known to be stack memory. */
576
577 extern void read_value_memory (struct value *val, int embedded_offset,
578 int stack, CORE_ADDR memaddr,
579 gdb_byte *buffer, size_t length);
580
581 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
582 into each element of a new vector value with VECTOR_TYPE. */
583
584 struct value *value_vector_widen (struct value *scalar_value,
585 struct type *vector_type);
586
587 \f
588
589 #include "symtab.h"
590 #include "gdbtypes.h"
591 #include "expression.h"
592
593 struct frame_info;
594 struct fn_field;
595
596 extern int print_address_demangle (const struct value_print_options *,
597 struct gdbarch *, CORE_ADDR,
598 struct ui_file *, int);
599
600 extern LONGEST value_as_long (struct value *val);
601 extern DOUBLEST value_as_double (struct value *val);
602 extern CORE_ADDR value_as_address (struct value *val);
603
604 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
605 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
606 int *invp);
607 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
608
609 extern LONGEST unpack_field_as_long (struct type *type,
610 const gdb_byte *valaddr,
611 int fieldno);
612 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
613 int embedded_offset, int fieldno,
614 const struct value *val, LONGEST *result);
615
616 extern void unpack_value_bitfield (struct value *dest_val,
617 int bitpos, int bitsize,
618 const gdb_byte *valaddr, int embedded_offset,
619 const struct value *val);
620
621 extern struct value *value_field_bitfield (struct type *type, int fieldno,
622 const gdb_byte *valaddr,
623 int embedded_offset,
624 const struct value *val);
625
626 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
627
628 extern struct value *value_from_longest (struct type *type, LONGEST num);
629 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
630 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
631 extern struct value *value_from_double (struct type *type, DOUBLEST num);
632 extern struct value *value_from_decfloat (struct type *type,
633 const gdb_byte *decbytes);
634 extern struct value *value_from_history_ref (const char *, const char **);
635
636 extern struct value *value_at (struct type *type, CORE_ADDR addr);
637 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
638
639 extern struct value *value_from_contents_and_address_unresolved
640 (struct type *, const gdb_byte *, CORE_ADDR);
641 extern struct value *value_from_contents_and_address (struct type *,
642 const gdb_byte *,
643 CORE_ADDR);
644 extern struct value *value_from_contents (struct type *, const gdb_byte *);
645
646 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
647 struct type *type,
648 int regnum,
649 struct frame_id frame_id);
650
651 extern void read_frame_register_value (struct value *value,
652 struct frame_info *frame);
653
654 extern struct value *value_from_register (struct type *type, int regnum,
655 struct frame_info *frame);
656
657 extern CORE_ADDR address_from_register (int regnum,
658 struct frame_info *frame);
659
660 extern struct value *value_of_variable (struct symbol *var,
661 const struct block *b);
662
663 extern struct value *address_of_variable (struct symbol *var,
664 const struct block *b);
665
666 extern struct value *value_of_register (int regnum, struct frame_info *frame);
667
668 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
669
670 extern int symbol_read_needs_frame (struct symbol *);
671
672 extern struct value *read_var_value (struct symbol *var,
673 struct frame_info *frame);
674
675 extern struct value *default_read_var_value (struct symbol *var,
676 struct frame_info *frame);
677
678 extern struct value *allocate_value (struct type *type);
679 extern struct value *allocate_value_lazy (struct type *type);
680 extern void value_contents_copy (struct value *dst, int dst_offset,
681 struct value *src, int src_offset,
682 int length);
683 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
684 struct value *src, int src_offset,
685 int length);
686
687 extern struct value *allocate_repeat_value (struct type *type, int count);
688
689 extern struct value *value_mark (void);
690
691 extern void value_free_to_mark (struct value *mark);
692
693 extern struct value *value_cstring (char *ptr, ssize_t len,
694 struct type *char_type);
695 extern struct value *value_string (char *ptr, ssize_t len,
696 struct type *char_type);
697
698 extern struct value *value_array (int lowbound, int highbound,
699 struct value **elemvec);
700
701 extern struct value *value_concat (struct value *arg1, struct value *arg2);
702
703 extern struct value *value_binop (struct value *arg1, struct value *arg2,
704 enum exp_opcode op);
705
706 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
707
708 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
709
710 extern int value_must_coerce_to_target (struct value *arg1);
711
712 extern struct value *value_coerce_to_target (struct value *arg1);
713
714 extern struct value *value_coerce_array (struct value *arg1);
715
716 extern struct value *value_coerce_function (struct value *arg1);
717
718 extern struct value *value_ind (struct value *arg1);
719
720 extern struct value *value_addr (struct value *arg1);
721
722 extern struct value *value_ref (struct value *arg1);
723
724 extern struct value *value_assign (struct value *toval,
725 struct value *fromval);
726
727 extern struct value *value_pos (struct value *arg1);
728
729 extern struct value *value_neg (struct value *arg1);
730
731 extern struct value *value_complement (struct value *arg1);
732
733 extern struct value *value_struct_elt (struct value **argp,
734 struct value **args,
735 const char *name, int *static_memfuncp,
736 const char *err);
737
738 extern struct value *value_struct_elt_bitpos (struct value **argp,
739 int bitpos,
740 struct type *field_type,
741 const char *err);
742
743 extern struct value *value_aggregate_elt (struct type *curtype,
744 const char *name,
745 struct type *expect_type,
746 int want_address,
747 enum noside noside);
748
749 extern struct value *value_static_field (struct type *type, int fieldno);
750
751 enum oload_search_type { NON_METHOD, METHOD, BOTH };
752
753 extern int find_overload_match (struct value **args, int nargs,
754 const char *name,
755 enum oload_search_type method,
756 struct value **objp, struct symbol *fsym,
757 struct value **valp, struct symbol **symp,
758 int *staticp, const int no_adl,
759 enum noside noside);
760
761 extern struct value *value_field (struct value *arg1, int fieldno);
762
763 extern struct value *value_primitive_field (struct value *arg1, int offset,
764 int fieldno,
765 struct type *arg_type);
766
767
768 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
769 int *);
770
771 extern struct value *value_full_object (struct value *, struct type *, int,
772 int, int);
773
774 extern struct value *value_cast_pointers (struct type *, struct value *, int);
775
776 extern struct value *value_cast (struct type *type, struct value *arg2);
777
778 extern struct value *value_reinterpret_cast (struct type *type,
779 struct value *arg);
780
781 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
782
783 extern struct value *value_zero (struct type *type, enum lval_type lv);
784
785 extern struct value *value_one (struct type *type);
786
787 extern struct value *value_repeat (struct value *arg1, int count);
788
789 extern struct value *value_subscript (struct value *array, LONGEST index);
790
791 extern struct value *value_bitstring_subscript (struct type *type,
792 struct value *bitstring,
793 LONGEST index);
794
795 extern struct value *register_value_being_returned (struct type *valtype,
796 struct regcache *retbuf);
797
798 extern int value_in (struct value *element, struct value *set);
799
800 extern int value_bit_index (struct type *type, const gdb_byte *addr,
801 int index);
802
803 extern enum return_value_convention
804 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
805 struct type *value_type);
806
807 extern int using_struct_return (struct gdbarch *gdbarch,
808 struct value *function,
809 struct type *value_type);
810
811 extern struct value *evaluate_expression (struct expression *exp);
812
813 extern struct value *evaluate_type (struct expression *exp);
814
815 extern struct value *evaluate_subexp (struct type *expect_type,
816 struct expression *exp,
817 int *pos, enum noside noside);
818
819 extern struct value *evaluate_subexpression_type (struct expression *exp,
820 int subexp);
821
822 extern void fetch_subexp_value (struct expression *exp, int *pc,
823 struct value **valp, struct value **resultp,
824 struct value **val_chain,
825 int preserve_errors);
826
827 extern char *extract_field_op (struct expression *exp, int *subexp);
828
829 extern struct value *evaluate_subexp_with_coercion (struct expression *,
830 int *, enum noside);
831
832 extern struct value *parse_and_eval (const char *exp);
833
834 extern struct value *parse_to_comma_and_eval (const char **expp);
835
836 extern struct type *parse_and_eval_type (char *p, int length);
837
838 extern CORE_ADDR parse_and_eval_address (const char *exp);
839
840 extern LONGEST parse_and_eval_long (const char *exp);
841
842 extern void unop_promote (const struct language_defn *language,
843 struct gdbarch *gdbarch,
844 struct value **arg1);
845
846 extern void binop_promote (const struct language_defn *language,
847 struct gdbarch *gdbarch,
848 struct value **arg1, struct value **arg2);
849
850 extern struct value *access_value_history (int num);
851
852 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
853 struct internalvar *var);
854
855 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
856
857 extern void set_internalvar (struct internalvar *var, struct value *val);
858
859 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
860
861 extern void set_internalvar_string (struct internalvar *var,
862 const char *string);
863
864 extern void clear_internalvar (struct internalvar *var);
865
866 extern void set_internalvar_component (struct internalvar *var,
867 int offset,
868 int bitpos, int bitsize,
869 struct value *newvalue);
870
871 extern struct internalvar *lookup_only_internalvar (const char *name);
872
873 extern struct internalvar *create_internalvar (const char *name);
874
875 extern VEC (char_ptr) *complete_internalvar (const char *name);
876
877 /* An internalvar can be dynamically computed by supplying a vector of
878 function pointers to perform various operations. */
879
880 struct internalvar_funcs
881 {
882 /* Compute the value of the variable. The DATA argument passed to
883 the function is the same argument that was passed to
884 `create_internalvar_type_lazy'. */
885
886 struct value *(*make_value) (struct gdbarch *arch,
887 struct internalvar *var,
888 void *data);
889
890 /* Update the agent expression EXPR with bytecode to compute the
891 value. VALUE is the agent value we are updating. The DATA
892 argument passed to this function is the same argument that was
893 passed to `create_internalvar_type_lazy'. If this pointer is
894 NULL, then the internalvar cannot be compiled to an agent
895 expression. */
896
897 void (*compile_to_ax) (struct internalvar *var,
898 struct agent_expr *expr,
899 struct axs_value *value,
900 void *data);
901
902 /* If non-NULL, this is called to destroy DATA. The DATA argument
903 passed to this function is the same argument that was passed to
904 `create_internalvar_type_lazy'. */
905
906 void (*destroy) (void *data);
907 };
908
909 extern struct internalvar *create_internalvar_type_lazy (const char *name,
910 const struct internalvar_funcs *funcs,
911 void *data);
912
913 /* Compile an internal variable to an agent expression. VAR is the
914 variable to compile; EXPR and VALUE are the agent expression we are
915 updating. This will return 0 if there is no known way to compile
916 VAR, and 1 if VAR was successfully compiled. It may also throw an
917 exception on error. */
918
919 extern int compile_internalvar_to_ax (struct internalvar *var,
920 struct agent_expr *expr,
921 struct axs_value *value);
922
923 extern struct internalvar *lookup_internalvar (const char *name);
924
925 extern int value_equal (struct value *arg1, struct value *arg2);
926
927 extern int value_equal_contents (struct value *arg1, struct value *arg2);
928
929 extern int value_less (struct value *arg1, struct value *arg2);
930
931 extern int value_logical_not (struct value *arg1);
932
933 /* C++ */
934
935 extern struct value *value_of_this (const struct language_defn *lang);
936
937 extern struct value *value_of_this_silent (const struct language_defn *lang);
938
939 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
940 enum exp_opcode op,
941 enum exp_opcode otherop,
942 enum noside noside);
943
944 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
945 enum noside noside);
946
947 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
948 int j, struct type *type, int offset);
949
950 extern int binop_types_user_defined_p (enum exp_opcode op,
951 struct type *type1,
952 struct type *type2);
953
954 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
955 struct value *arg2);
956
957 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
958
959 extern int destructor_name_p (const char *name, struct type *type);
960
961 extern void value_incref (struct value *val);
962
963 extern void value_free (struct value *val);
964
965 extern void free_all_values (void);
966
967 extern void free_value_chain (struct value *v);
968
969 extern void release_value (struct value *val);
970
971 extern void release_value_or_incref (struct value *val);
972
973 extern int record_latest_value (struct value *val);
974
975 extern void modify_field (struct type *type, gdb_byte *addr,
976 LONGEST fieldval, int bitpos, int bitsize);
977
978 extern void type_print (struct type *type, const char *varstring,
979 struct ui_file *stream, int show);
980
981 extern char *type_to_string (struct type *type);
982
983 extern gdb_byte *baseclass_addr (struct type *type, int index,
984 gdb_byte *valaddr,
985 struct value **valuep, int *errp);
986
987 extern void print_longest (struct ui_file *stream, int format,
988 int use_local, LONGEST val);
989
990 extern void print_floating (const gdb_byte *valaddr, struct type *type,
991 struct ui_file *stream);
992
993 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
994 struct ui_file *stream);
995
996 extern void value_print (struct value *val, struct ui_file *stream,
997 const struct value_print_options *options);
998
999 extern void value_print_array_elements (struct value *val,
1000 struct ui_file *stream, int format,
1001 enum val_prettyformat pretty);
1002
1003 extern struct value *value_release_to_mark (struct value *mark);
1004
1005 extern void val_print (struct type *type, const gdb_byte *valaddr,
1006 int embedded_offset, CORE_ADDR address,
1007 struct ui_file *stream, int recurse,
1008 const struct value *val,
1009 const struct value_print_options *options,
1010 const struct language_defn *language);
1011
1012 extern void common_val_print (struct value *val,
1013 struct ui_file *stream, int recurse,
1014 const struct value_print_options *options,
1015 const struct language_defn *language);
1016
1017 extern int val_print_string (struct type *elttype, const char *encoding,
1018 CORE_ADDR addr, int len,
1019 struct ui_file *stream,
1020 const struct value_print_options *options);
1021
1022 extern void print_variable_and_value (const char *name,
1023 struct symbol *var,
1024 struct frame_info *frame,
1025 struct ui_file *stream,
1026 int indent);
1027
1028 extern void typedef_print (struct type *type, struct symbol *news,
1029 struct ui_file *stream);
1030
1031 extern char *internalvar_name (struct internalvar *var);
1032
1033 extern void preserve_values (struct objfile *);
1034
1035 /* From values.c */
1036
1037 extern struct value *value_copy (struct value *);
1038
1039 extern struct value *value_non_lval (struct value *);
1040
1041 extern void value_force_lval (struct value *, CORE_ADDR);
1042
1043 extern struct value *make_cv_value (int, int, struct value *);
1044
1045 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
1046
1047 /* From valops.c */
1048
1049 extern struct value *varying_to_slice (struct value *);
1050
1051 extern struct value *value_slice (struct value *, int, int);
1052
1053 extern struct value *value_literal_complex (struct value *, struct value *,
1054 struct type *);
1055
1056 extern struct value *find_function_in_inferior (const char *,
1057 struct objfile **);
1058
1059 extern struct value *value_allocate_space_in_inferior (int);
1060
1061 extern struct value *value_subscripted_rvalue (struct value *array,
1062 LONGEST index, int lowerbound);
1063
1064 /* User function handler. */
1065
1066 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
1067 const struct language_defn *language,
1068 void *cookie,
1069 int argc,
1070 struct value **argv);
1071
1072 void add_internal_function (const char *name, const char *doc,
1073 internal_function_fn handler,
1074 void *cookie);
1075
1076 struct value *call_internal_function (struct gdbarch *gdbarch,
1077 const struct language_defn *language,
1078 struct value *function,
1079 int argc, struct value **argv);
1080
1081 char *value_internal_function_name (struct value *);
1082
1083 extern struct value *value_of_xmethod (struct xmethod_worker *);
1084
1085 extern struct type *result_type_of_xmethod (struct value *method,
1086 int argc, struct value **argv);
1087
1088 extern struct value *call_xmethod (struct value *method,
1089 int argc, struct value **argv);
1090
1091 #endif /* !defined (VALUE_H) */