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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 /* Return the gdbarch associated with the value. */
103
104 extern struct gdbarch *get_value_arch (const struct value *value);
105
106 /* This is being used to change the type of an existing value, that
107 code should instead be creating a new value with the changed type
108 (but possibly shared content). */
109
110 extern void deprecated_set_value_type (struct value *value,
111 struct type *type);
112
113 /* Only used for bitfields; number of bits contained in them. */
114
115 extern int value_bitsize (const struct value *);
116 extern void set_value_bitsize (struct value *, int bit);
117
118 /* Only used for bitfields; position of start of field. For
119 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
120 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
121
122 extern int value_bitpos (const struct value *);
123 extern void set_value_bitpos (struct value *, int bit);
124
125 /* Only used for bitfields; the containing value. This allows a
126 single read from the target when displaying multiple
127 bitfields. */
128
129 struct value *value_parent (struct value *);
130 extern void set_value_parent (struct value *value, struct value *parent);
131
132 /* Describes offset of a value within lval of a structure in bytes.
133 If lval == lval_memory, this is an offset to the address. If lval
134 == lval_register, this is a further offset from location.address
135 within the registers structure. Note also the member
136 embedded_offset below. */
137
138 extern int value_offset (const struct value *);
139 extern void set_value_offset (struct value *, int offset);
140
141 /* The comment from "struct value" reads: ``Is it modifiable? Only
142 relevant if lval != not_lval.''. Shouldn't the value instead be
143 not_lval and be done with it? */
144
145 extern int deprecated_value_modifiable (struct value *value);
146
147 /* If a value represents a C++ object, then the `type' field gives the
148 object's compile-time type. If the object actually belongs to some
149 class derived from `type', perhaps with other base classes and
150 additional members, then `type' is just a subobject of the real
151 thing, and the full object is probably larger than `type' would
152 suggest.
153
154 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
155 actually determine the object's run-time type by looking at the
156 run-time type information in the vtable. When this information is
157 available, we may elect to read in the entire object, for several
158 reasons:
159
160 - When printing the value, the user would probably rather see the
161 full object, not just the limited portion apparent from the
162 compile-time type.
163
164 - If `type' has virtual base classes, then even printing `type'
165 alone may require reaching outside the `type' portion of the
166 object to wherever the virtual base class has been stored.
167
168 When we store the entire object, `enclosing_type' is the run-time
169 type -- the complete object -- and `embedded_offset' is the offset
170 of `type' within that larger type, in bytes. The value_contents()
171 macro takes `embedded_offset' into account, so most GDB code
172 continues to see the `type' portion of the value, just as the
173 inferior would.
174
175 If `type' is a pointer to an object, then `enclosing_type' is a
176 pointer to the object's run-time type, and `pointed_to_offset' is
177 the offset in bytes from the full object to the pointed-to object
178 -- that is, the value `embedded_offset' would have if we followed
179 the pointer and fetched the complete object. (I don't really see
180 the point. Why not just determine the run-time type when you
181 indirect, and avoid the special case? The contents don't matter
182 until you indirect anyway.)
183
184 If we're not doing anything fancy, `enclosing_type' is equal to
185 `type', and `embedded_offset' is zero, so everything works
186 normally. */
187
188 extern struct type *value_enclosing_type (struct value *);
189 extern void set_value_enclosing_type (struct value *val,
190 struct type *new_type);
191
192 /* Returns value_type or value_enclosing_type depending on
193 value_print_options.objectprint.
194
195 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
196 only for pointers and references, else it will be returned
197 for all the types (e.g. structures). This option is useful
198 to prevent retrieving enclosing type for the base classes fields.
199
200 REAL_TYPE_FOUND is used to inform whether the real type was found
201 (or just static type was used). The NULL may be passed if it is not
202 necessary. */
203
204 extern struct type *value_actual_type (struct value *value,
205 int resolve_simple_types,
206 int *real_type_found);
207
208 extern int value_pointed_to_offset (struct value *value);
209 extern void set_value_pointed_to_offset (struct value *value, int val);
210 extern int value_embedded_offset (struct value *value);
211 extern void set_value_embedded_offset (struct value *value, int val);
212
213 /* For lval_computed values, this structure holds functions used to
214 retrieve and set the value (or portions of the value).
215
216 For each function, 'V' is the 'this' pointer: an lval_funcs
217 function F may always assume that the V it receives is an
218 lval_computed value, and has F in the appropriate slot of its
219 lval_funcs structure. */
220
221 struct lval_funcs
222 {
223 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
224 a problem arises in obtaining VALUE's bits, this function should
225 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
226 non-optimized-out value is an internal error. */
227 void (*read) (struct value *v);
228
229 /* Handle an assignment TOVAL = FROMVAL by writing the value of
230 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
231 been updated. If a problem arises in doing so, this function
232 should call 'error'. If it is NULL such TOVAL assignment is an error as
233 TOVAL is not considered as an lvalue. */
234 void (*write) (struct value *toval, struct value *fromval);
235
236 /* If non-NULL, this is used to implement pointer indirection for
237 this value. This method may return NULL, in which case value_ind
238 will fall back to ordinary indirection. */
239 struct value *(*indirect) (struct value *value);
240
241 /* If non-NULL, this is used to implement reference resolving for
242 this value. This method may return NULL, in which case coerce_ref
243 will fall back to ordinary references resolving. */
244 struct value *(*coerce_ref) (const struct value *value);
245
246 /* If non-NULL, this is used to determine whether the indicated bits
247 of VALUE are a synthetic pointer. */
248 int (*check_synthetic_pointer) (const struct value *value,
249 int offset, int length);
250
251 /* Return a duplicate of VALUE's closure, for use in a new value.
252 This may simply return the same closure, if VALUE's is
253 reference-counted or statically allocated.
254
255 This may be NULL, in which case VALUE's closure is re-used in the
256 new value. */
257 void *(*copy_closure) (const struct value *v);
258
259 /* Drop VALUE's reference to its closure. Maybe this frees the
260 closure; maybe this decrements a reference count; maybe the
261 closure is statically allocated and this does nothing.
262
263 This may be NULL, in which case no action is taken to free
264 VALUE's closure. */
265 void (*free_closure) (struct value *v);
266 };
267
268 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
269 and closure CLOSURE. */
270
271 extern struct value *allocate_computed_value (struct type *type,
272 const struct lval_funcs *funcs,
273 void *closure);
274
275 /* Helper function to check the validity of some bits of a value.
276
277 If TYPE represents some aggregate type (e.g., a structure), return 1.
278
279 Otherwise, any of the bytes starting at OFFSET and extending for
280 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
281 return 0. The checking is done using FUNCS.
282
283 Otherwise, return 1. */
284
285 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
286 int embedded_offset,
287 const struct value *val);
288
289 extern struct value *allocate_optimized_out_value (struct type *type);
290
291 /* If VALUE is lval_computed, return its lval_funcs structure. */
292
293 extern const struct lval_funcs *value_computed_funcs (const struct value *);
294
295 /* If VALUE is lval_computed, return its closure. The meaning of the
296 returned value depends on the functions VALUE uses. */
297
298 extern void *value_computed_closure (const struct value *value);
299
300 /* If zero, contents of this value are in the contents field. If
301 nonzero, contents are in inferior. If the lval field is lval_memory,
302 the contents are in inferior memory at location.address plus offset.
303 The lval field may also be lval_register.
304
305 WARNING: This field is used by the code which handles watchpoints
306 (see breakpoint.c) to decide whether a particular value can be
307 watched by hardware watchpoints. If the lazy flag is set for some
308 member of a value chain, it is assumed that this member of the
309 chain doesn't need to be watched as part of watching the value
310 itself. This is how GDB avoids watching the entire struct or array
311 when the user wants to watch a single struct member or array
312 element. If you ever change the way lazy flag is set and reset, be
313 sure to consider this use as well! */
314
315 extern int value_lazy (struct value *);
316 extern void set_value_lazy (struct value *value, int val);
317
318 extern int value_stack (struct value *);
319 extern void set_value_stack (struct value *value, int val);
320
321 /* Throw an error complaining that the value has been optimized
322 out. */
323
324 extern void error_value_optimized_out (void);
325
326 /* value_contents() and value_contents_raw() both return the address
327 of the gdb buffer used to hold a copy of the contents of the lval.
328 value_contents() is used when the contents of the buffer are needed
329 -- it uses value_fetch_lazy() to load the buffer from the process
330 being debugged if it hasn't already been loaded
331 (value_contents_writeable() is used when a writeable but fetched
332 buffer is required).. value_contents_raw() is used when data is
333 being stored into the buffer, or when it is certain that the
334 contents of the buffer are valid.
335
336 Note: The contents pointer is adjusted by the offset required to
337 get to the real subobject, if the value happens to represent
338 something embedded in a larger run-time object. */
339
340 extern gdb_byte *value_contents_raw (struct value *);
341
342 /* Actual contents of the value. For use of this value; setting it
343 uses the stuff above. Not valid if lazy is nonzero. Target
344 byte-order. We force it to be aligned properly for any possible
345 value. Note that a value therefore extends beyond what is
346 declared here. */
347
348 extern const gdb_byte *value_contents (struct value *);
349 extern gdb_byte *value_contents_writeable (struct value *);
350
351 /* The ALL variants of the above two macros do not adjust the returned
352 pointer by the embedded_offset value. */
353
354 extern gdb_byte *value_contents_all_raw (struct value *);
355 extern const gdb_byte *value_contents_all (struct value *);
356
357 /* Like value_contents_all, but does not require that the returned
358 bits be valid. This should only be used in situations where you
359 plan to check the validity manually. */
360 extern const gdb_byte *value_contents_for_printing (struct value *value);
361
362 /* Like value_contents_for_printing, but accepts a constant value
363 pointer. Unlike value_contents_for_printing however, the pointed
364 value must _not_ be lazy. */
365 extern const gdb_byte *
366 value_contents_for_printing_const (const struct value *value);
367
368 extern void value_fetch_lazy (struct value *val);
369
370 /* If nonzero, this is the value of a variable which does not actually
371 exist in the program, at least partially. If the value is lazy,
372 this may fetch it now. */
373 extern int value_optimized_out (struct value *value);
374
375 /* Given a value, return true if any of the contents bits starting at
376 OFFSET and extending for LENGTH bits is optimized out, false
377 otherwise. */
378
379 extern int value_bits_any_optimized_out (const struct value *value,
380 int bit_offset, int bit_length);
381
382 /* Like value_optimized_out, but return true iff the whole value is
383 optimized out. */
384 extern int value_entirely_optimized_out (struct value *value);
385
386 /* Mark VALUE's content bytes starting at OFFSET and extending for
387 LENGTH bytes as optimized out. */
388
389 extern void mark_value_bytes_optimized_out (struct value *value,
390 int offset, int length);
391
392 /* Mark VALUE's content bits starting at OFFSET and extending for
393 LENGTH bits as optimized out. */
394
395 extern void mark_value_bits_optimized_out (struct value *value,
396 int offset, int length);
397
398 /* Set or return field indicating whether a variable is initialized or
399 not, based on debugging information supplied by the compiler.
400 1 = initialized; 0 = uninitialized. */
401 extern int value_initialized (struct value *);
402 extern void set_value_initialized (struct value *, int);
403
404 /* Set COMPONENT's location as appropriate for a component of WHOLE
405 --- regardless of what kind of lvalue WHOLE is. */
406 extern void set_value_component_location (struct value *component,
407 const struct value *whole);
408
409 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
410 single value might have multiple LVALs), this hacked interface is
411 limited to just the first PIECE. Expect further change. */
412 /* Type of value; either not an lval, or one of the various different
413 possible kinds of lval. */
414 extern enum lval_type *deprecated_value_lval_hack (struct value *);
415 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
416
417 /* Like VALUE_LVAL, except the parameter can be const. */
418 extern enum lval_type value_lval_const (const struct value *value);
419
420 /* If lval == lval_memory, return the address in the inferior. If
421 lval == lval_register, return the byte offset into the registers
422 structure. Otherwise, return 0. The returned address
423 includes the offset, if any. */
424 extern CORE_ADDR value_address (const struct value *);
425
426 /* Like value_address, except the result does not include value's
427 offset. */
428 extern CORE_ADDR value_raw_address (struct value *);
429
430 /* Set the address of a value. */
431 extern void set_value_address (struct value *, CORE_ADDR);
432
433 /* Pointer to internal variable. */
434 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
435 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
436
437 /* Frame register value is relative to. This will be described in the
438 lval enum above as "lval_register". */
439 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
440 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
441
442 /* Register number if the value is from a register. */
443 extern short *deprecated_value_regnum_hack (struct value *);
444 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
445
446 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
447 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
448
449 extern struct value *coerce_ref_if_computed (const struct value *arg);
450
451 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
452 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
453 ORIGINAL_VAL are the type and value of the original reference or pointer.
454
455 Note, that VALUE is modified by this function.
456
457 It is a common implementation for coerce_ref and value_ind. */
458
459 extern struct value * readjust_indirect_value_type (struct value *value,
460 struct type *enc_type,
461 struct type *original_type,
462 struct value *original_val);
463
464 /* Convert a REF to the object referenced. */
465
466 extern struct value *coerce_ref (struct value *value);
467
468 /* If ARG is an array, convert it to a pointer.
469 If ARG is a function, convert it to a function pointer.
470
471 References are dereferenced. */
472
473 extern struct value *coerce_array (struct value *value);
474
475 /* Given a value, determine whether the bits starting at OFFSET and
476 extending for LENGTH bits are a synthetic pointer. */
477
478 extern int value_bits_synthetic_pointer (const struct value *value,
479 int offset, int length);
480
481 /* Given a value, determine whether the contents bytes starting at
482 OFFSET and extending for LENGTH bytes are available. This returns
483 nonzero if all bytes in the given range are available, zero if any
484 byte is unavailable. */
485
486 extern int value_bytes_available (const struct value *value,
487 int offset, int length);
488
489 /* Given a value, determine whether the contents bits starting at
490 OFFSET and extending for LENGTH bits are available. This returns
491 nonzero if all bits in the given range are available, zero if any
492 bit is unavailable. */
493
494 extern int value_bits_available (const struct value *value,
495 int offset, int length);
496
497 /* Like value_bytes_available, but return false if any byte in the
498 whole object is unavailable. */
499 extern int value_entirely_available (struct value *value);
500
501 /* Like value_entirely_available, but return false if any byte in the
502 whole object is available. */
503 extern int value_entirely_unavailable (struct value *value);
504
505 /* Mark VALUE's content bytes starting at OFFSET and extending for
506 LENGTH bytes as unavailable. */
507
508 extern void mark_value_bytes_unavailable (struct value *value,
509 int offset, int length);
510
511 /* Mark VALUE's content bits starting at OFFSET and extending for
512 LENGTH bits as unavailable. */
513
514 extern void mark_value_bits_unavailable (struct value *value,
515 int offset, int length);
516
517 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
518 LENGTH bytes of VAL2's contents starting at OFFSET2.
519
520 Note that "contents" refers to the whole value's contents
521 (value_contents_all), without any embedded offset adjustment. For
522 example, to compare a complete object value with itself, including
523 its enclosing type chunk, you'd do:
524
525 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
526 value_contents_eq (val, 0, val, 0, len);
527
528 Returns true iff the set of available/valid contents match.
529
530 Optimized-out contents are equal to optimized-out contents, and are
531 not equal to non-optimized-out contents.
532
533 Unavailable contente are equal to unavailable contents, and are not
534 equal to non-unavailable contents.
535
536 For example, if 'x's represent an unavailable byte, and 'V' and 'Z'
537 represent different available/valid bytes, in a value with length
538 16:
539
540 offset: 0 4 8 12 16
541 contents: xxxxVVVVxxxxVVZZ
542
543 then:
544
545 value_contents_eq(val, 0, val, 8, 6) => 1
546 value_contents_eq(val, 0, val, 4, 4) => 0
547 value_contents_eq(val, 0, val, 8, 8) => 0
548 value_contents_eq(val, 4, val, 12, 2) => 1
549 value_contents_eq(val, 4, val, 12, 4) => 0
550 value_contents_eq(val, 3, val, 4, 4) => 0
551
552 If 'x's represent an unavailable byte, 'o' represents an optimized
553 out byte, in a value with length 8:
554
555 offset: 0 4 8
556 contents: xxxxoooo
557
558 then:
559
560 value_contents_eq(val, 0, val, 2, 2) => 1
561 value_contents_eq(val, 4, val, 6, 2) => 1
562 value_contents_eq(val, 0, val, 4, 4) => 0
563
564 We only know whether a value chunk is unavailable or optimized out
565 if we've tried to read it. As this routine is used by printing
566 routines, which may be printing values in the value history, long
567 after the inferior is gone, it works with const values. Therefore,
568 this routine must not be called with lazy values. */
569
570 extern int value_contents_eq (const struct value *val1, int offset1,
571 const struct value *val2, int offset2,
572 int length);
573
574 /* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
575 which is (or will be copied to) VAL's contents buffer offset by
576 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
577 Marks value contents ranges as unavailable if the corresponding
578 memory is likewise unavailable. STACK indicates whether the memory
579 is known to be stack memory. */
580
581 extern void read_value_memory (struct value *val, int embedded_offset,
582 int stack, CORE_ADDR memaddr,
583 gdb_byte *buffer, size_t length);
584
585 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
586 into each element of a new vector value with VECTOR_TYPE. */
587
588 struct value *value_vector_widen (struct value *scalar_value,
589 struct type *vector_type);
590
591 \f
592
593 #include "symtab.h"
594 #include "gdbtypes.h"
595 #include "expression.h"
596
597 struct frame_info;
598 struct fn_field;
599
600 extern int print_address_demangle (const struct value_print_options *,
601 struct gdbarch *, CORE_ADDR,
602 struct ui_file *, int);
603
604 extern LONGEST value_as_long (struct value *val);
605 extern DOUBLEST value_as_double (struct value *val);
606 extern CORE_ADDR value_as_address (struct value *val);
607
608 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
609 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
610 int *invp);
611 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
612
613 extern LONGEST unpack_field_as_long (struct type *type,
614 const gdb_byte *valaddr,
615 int fieldno);
616 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
617 int embedded_offset, int fieldno,
618 const struct value *val, LONGEST *result);
619
620 extern void unpack_value_bitfield (struct value *dest_val,
621 int bitpos, int bitsize,
622 const gdb_byte *valaddr, int embedded_offset,
623 const struct value *val);
624
625 extern struct value *value_field_bitfield (struct type *type, int fieldno,
626 const gdb_byte *valaddr,
627 int embedded_offset,
628 const struct value *val);
629
630 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
631
632 extern struct value *value_from_longest (struct type *type, LONGEST num);
633 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
634 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
635 extern struct value *value_from_double (struct type *type, DOUBLEST num);
636 extern struct value *value_from_decfloat (struct type *type,
637 const gdb_byte *decbytes);
638 extern struct value *value_from_history_ref (const char *, const char **);
639
640 extern struct value *value_at (struct type *type, CORE_ADDR addr);
641 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
642
643 extern struct value *value_from_contents_and_address_unresolved
644 (struct type *, const gdb_byte *, CORE_ADDR);
645 extern struct value *value_from_contents_and_address (struct type *,
646 const gdb_byte *,
647 CORE_ADDR);
648 extern struct value *value_from_contents (struct type *, const gdb_byte *);
649
650 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
651 struct type *type,
652 int regnum,
653 struct frame_id frame_id);
654
655 extern void read_frame_register_value (struct value *value,
656 struct frame_info *frame);
657
658 extern struct value *value_from_register (struct type *type, int regnum,
659 struct frame_info *frame);
660
661 extern CORE_ADDR address_from_register (int regnum,
662 struct frame_info *frame);
663
664 extern struct value *value_of_variable (struct symbol *var,
665 const struct block *b);
666
667 extern struct value *address_of_variable (struct symbol *var,
668 const struct block *b);
669
670 extern struct value *value_of_register (int regnum, struct frame_info *frame);
671
672 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
673
674 extern int symbol_read_needs_frame (struct symbol *);
675
676 extern struct value *read_var_value (struct symbol *var,
677 const struct block *var_block,
678 struct frame_info *frame);
679
680 extern struct value *default_read_var_value (struct symbol *var,
681 const struct block *var_block,
682 struct frame_info *frame);
683
684 extern struct value *allocate_value (struct type *type);
685 extern struct value *allocate_value_lazy (struct type *type);
686 extern void value_contents_copy (struct value *dst, int dst_offset,
687 struct value *src, int src_offset,
688 int length);
689 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
690 struct value *src, int src_offset,
691 int length);
692
693 extern struct value *allocate_repeat_value (struct type *type, int count);
694
695 extern struct value *value_mark (void);
696
697 extern void value_free_to_mark (struct value *mark);
698
699 extern struct value *value_cstring (const char *ptr, ssize_t len,
700 struct type *char_type);
701 extern struct value *value_string (const char *ptr, ssize_t len,
702 struct type *char_type);
703
704 extern struct value *value_array (int lowbound, int highbound,
705 struct value **elemvec);
706
707 extern struct value *value_concat (struct value *arg1, struct value *arg2);
708
709 extern struct value *value_binop (struct value *arg1, struct value *arg2,
710 enum exp_opcode op);
711
712 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
713
714 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
715
716 extern int value_must_coerce_to_target (struct value *arg1);
717
718 extern struct value *value_coerce_to_target (struct value *arg1);
719
720 extern struct value *value_coerce_array (struct value *arg1);
721
722 extern struct value *value_coerce_function (struct value *arg1);
723
724 extern struct value *value_ind (struct value *arg1);
725
726 extern struct value *value_addr (struct value *arg1);
727
728 extern struct value *value_ref (struct value *arg1);
729
730 extern struct value *value_assign (struct value *toval,
731 struct value *fromval);
732
733 extern struct value *value_pos (struct value *arg1);
734
735 extern struct value *value_neg (struct value *arg1);
736
737 extern struct value *value_complement (struct value *arg1);
738
739 extern struct value *value_struct_elt (struct value **argp,
740 struct value **args,
741 const char *name, int *static_memfuncp,
742 const char *err);
743
744 extern struct value *value_struct_elt_bitpos (struct value **argp,
745 int bitpos,
746 struct type *field_type,
747 const char *err);
748
749 extern struct value *value_aggregate_elt (struct type *curtype,
750 const char *name,
751 struct type *expect_type,
752 int want_address,
753 enum noside noside);
754
755 extern struct value *value_static_field (struct type *type, int fieldno);
756
757 enum oload_search_type { NON_METHOD, METHOD, BOTH };
758
759 extern int find_overload_match (struct value **args, int nargs,
760 const char *name,
761 enum oload_search_type method,
762 struct value **objp, struct symbol *fsym,
763 struct value **valp, struct symbol **symp,
764 int *staticp, const int no_adl,
765 enum noside noside);
766
767 extern struct value *value_field (struct value *arg1, int fieldno);
768
769 extern struct value *value_primitive_field (struct value *arg1, int offset,
770 int fieldno,
771 struct type *arg_type);
772
773
774 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
775 int *);
776
777 extern struct value *value_full_object (struct value *, struct type *, int,
778 int, int);
779
780 extern struct value *value_cast_pointers (struct type *, struct value *, int);
781
782 extern struct value *value_cast (struct type *type, struct value *arg2);
783
784 extern struct value *value_reinterpret_cast (struct type *type,
785 struct value *arg);
786
787 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
788
789 extern struct value *value_zero (struct type *type, enum lval_type lv);
790
791 extern struct value *value_one (struct type *type);
792
793 extern struct value *value_repeat (struct value *arg1, int count);
794
795 extern struct value *value_subscript (struct value *array, LONGEST index);
796
797 extern struct value *value_bitstring_subscript (struct type *type,
798 struct value *bitstring,
799 LONGEST index);
800
801 extern struct value *register_value_being_returned (struct type *valtype,
802 struct regcache *retbuf);
803
804 extern int value_in (struct value *element, struct value *set);
805
806 extern int value_bit_index (struct type *type, const gdb_byte *addr,
807 int index);
808
809 extern enum return_value_convention
810 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
811 struct type *value_type);
812
813 extern int using_struct_return (struct gdbarch *gdbarch,
814 struct value *function,
815 struct type *value_type);
816
817 extern struct value *evaluate_expression (struct expression *exp);
818
819 extern struct value *evaluate_type (struct expression *exp);
820
821 extern struct value *evaluate_subexp (struct type *expect_type,
822 struct expression *exp,
823 int *pos, enum noside noside);
824
825 extern struct value *evaluate_subexpression_type (struct expression *exp,
826 int subexp);
827
828 extern void fetch_subexp_value (struct expression *exp, int *pc,
829 struct value **valp, struct value **resultp,
830 struct value **val_chain,
831 int preserve_errors);
832
833 extern char *extract_field_op (struct expression *exp, int *subexp);
834
835 extern struct value *evaluate_subexp_with_coercion (struct expression *,
836 int *, enum noside);
837
838 extern struct value *parse_and_eval (const char *exp);
839
840 extern struct value *parse_to_comma_and_eval (const char **expp);
841
842 extern struct type *parse_and_eval_type (char *p, int length);
843
844 extern CORE_ADDR parse_and_eval_address (const char *exp);
845
846 extern LONGEST parse_and_eval_long (const char *exp);
847
848 extern void unop_promote (const struct language_defn *language,
849 struct gdbarch *gdbarch,
850 struct value **arg1);
851
852 extern void binop_promote (const struct language_defn *language,
853 struct gdbarch *gdbarch,
854 struct value **arg1, struct value **arg2);
855
856 extern struct value *access_value_history (int num);
857
858 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
859 struct internalvar *var);
860
861 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
862
863 extern void set_internalvar (struct internalvar *var, struct value *val);
864
865 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
866
867 extern void set_internalvar_string (struct internalvar *var,
868 const char *string);
869
870 extern void clear_internalvar (struct internalvar *var);
871
872 extern void set_internalvar_component (struct internalvar *var,
873 int offset,
874 int bitpos, int bitsize,
875 struct value *newvalue);
876
877 extern struct internalvar *lookup_only_internalvar (const char *name);
878
879 extern struct internalvar *create_internalvar (const char *name);
880
881 extern VEC (char_ptr) *complete_internalvar (const char *name);
882
883 /* An internalvar can be dynamically computed by supplying a vector of
884 function pointers to perform various operations. */
885
886 struct internalvar_funcs
887 {
888 /* Compute the value of the variable. The DATA argument passed to
889 the function is the same argument that was passed to
890 `create_internalvar_type_lazy'. */
891
892 struct value *(*make_value) (struct gdbarch *arch,
893 struct internalvar *var,
894 void *data);
895
896 /* Update the agent expression EXPR with bytecode to compute the
897 value. VALUE is the agent value we are updating. The DATA
898 argument passed to this function is the same argument that was
899 passed to `create_internalvar_type_lazy'. If this pointer is
900 NULL, then the internalvar cannot be compiled to an agent
901 expression. */
902
903 void (*compile_to_ax) (struct internalvar *var,
904 struct agent_expr *expr,
905 struct axs_value *value,
906 void *data);
907
908 /* If non-NULL, this is called to destroy DATA. The DATA argument
909 passed to this function is the same argument that was passed to
910 `create_internalvar_type_lazy'. */
911
912 void (*destroy) (void *data);
913 };
914
915 extern struct internalvar *create_internalvar_type_lazy (const char *name,
916 const struct internalvar_funcs *funcs,
917 void *data);
918
919 /* Compile an internal variable to an agent expression. VAR is the
920 variable to compile; EXPR and VALUE are the agent expression we are
921 updating. This will return 0 if there is no known way to compile
922 VAR, and 1 if VAR was successfully compiled. It may also throw an
923 exception on error. */
924
925 extern int compile_internalvar_to_ax (struct internalvar *var,
926 struct agent_expr *expr,
927 struct axs_value *value);
928
929 extern struct internalvar *lookup_internalvar (const char *name);
930
931 extern int value_equal (struct value *arg1, struct value *arg2);
932
933 extern int value_equal_contents (struct value *arg1, struct value *arg2);
934
935 extern int value_less (struct value *arg1, struct value *arg2);
936
937 extern int value_logical_not (struct value *arg1);
938
939 /* C++ */
940
941 extern struct value *value_of_this (const struct language_defn *lang);
942
943 extern struct value *value_of_this_silent (const struct language_defn *lang);
944
945 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
946 enum exp_opcode op,
947 enum exp_opcode otherop,
948 enum noside noside);
949
950 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
951 enum noside noside);
952
953 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
954 int j, struct type *type, int offset);
955
956 extern int binop_types_user_defined_p (enum exp_opcode op,
957 struct type *type1,
958 struct type *type2);
959
960 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
961 struct value *arg2);
962
963 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
964
965 extern int destructor_name_p (const char *name, struct type *type);
966
967 extern void value_incref (struct value *val);
968
969 extern void value_free (struct value *val);
970
971 extern void free_all_values (void);
972
973 extern void free_value_chain (struct value *v);
974
975 extern void release_value (struct value *val);
976
977 extern void release_value_or_incref (struct value *val);
978
979 extern int record_latest_value (struct value *val);
980
981 extern void modify_field (struct type *type, gdb_byte *addr,
982 LONGEST fieldval, int bitpos, int bitsize);
983
984 extern void type_print (struct type *type, const char *varstring,
985 struct ui_file *stream, int show);
986
987 extern char *type_to_string (struct type *type);
988
989 extern gdb_byte *baseclass_addr (struct type *type, int index,
990 gdb_byte *valaddr,
991 struct value **valuep, int *errp);
992
993 extern void print_longest (struct ui_file *stream, int format,
994 int use_local, LONGEST val);
995
996 extern void print_floating (const gdb_byte *valaddr, struct type *type,
997 struct ui_file *stream);
998
999 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
1000 struct ui_file *stream);
1001
1002 extern void value_print (struct value *val, struct ui_file *stream,
1003 const struct value_print_options *options);
1004
1005 extern void value_print_array_elements (struct value *val,
1006 struct ui_file *stream, int format,
1007 enum val_prettyformat pretty);
1008
1009 extern struct value *value_release_to_mark (struct value *mark);
1010
1011 extern void val_print (struct type *type, const gdb_byte *valaddr,
1012 int embedded_offset, CORE_ADDR address,
1013 struct ui_file *stream, int recurse,
1014 const struct value *val,
1015 const struct value_print_options *options,
1016 const struct language_defn *language);
1017
1018 extern void common_val_print (struct value *val,
1019 struct ui_file *stream, int recurse,
1020 const struct value_print_options *options,
1021 const struct language_defn *language);
1022
1023 extern int val_print_string (struct type *elttype, const char *encoding,
1024 CORE_ADDR addr, int len,
1025 struct ui_file *stream,
1026 const struct value_print_options *options);
1027
1028 extern void print_variable_and_value (const char *name,
1029 struct symbol *var,
1030 struct frame_info *frame,
1031 struct ui_file *stream,
1032 int indent);
1033
1034 extern void typedef_print (struct type *type, struct symbol *news,
1035 struct ui_file *stream);
1036
1037 extern char *internalvar_name (struct internalvar *var);
1038
1039 extern void preserve_values (struct objfile *);
1040
1041 /* From values.c */
1042
1043 extern struct value *value_copy (struct value *);
1044
1045 extern struct value *value_non_lval (struct value *);
1046
1047 extern void value_force_lval (struct value *, CORE_ADDR);
1048
1049 extern struct value *make_cv_value (int, int, struct value *);
1050
1051 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
1052
1053 /* From valops.c */
1054
1055 extern struct value *varying_to_slice (struct value *);
1056
1057 extern struct value *value_slice (struct value *, int, int);
1058
1059 extern struct value *value_literal_complex (struct value *, struct value *,
1060 struct type *);
1061
1062 extern struct value *find_function_in_inferior (const char *,
1063 struct objfile **);
1064
1065 extern struct value *value_allocate_space_in_inferior (int);
1066
1067 extern struct value *value_subscripted_rvalue (struct value *array,
1068 LONGEST index, int lowerbound);
1069
1070 /* User function handler. */
1071
1072 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
1073 const struct language_defn *language,
1074 void *cookie,
1075 int argc,
1076 struct value **argv);
1077
1078 void add_internal_function (const char *name, const char *doc,
1079 internal_function_fn handler,
1080 void *cookie);
1081
1082 struct value *call_internal_function (struct gdbarch *gdbarch,
1083 const struct language_defn *language,
1084 struct value *function,
1085 int argc, struct value **argv);
1086
1087 char *value_internal_function_name (struct value *);
1088
1089 extern struct value *value_of_xmethod (struct xmethod_worker *);
1090
1091 extern struct type *result_type_of_xmethod (struct value *method,
1092 int argc, struct value **argv);
1093
1094 extern struct value *call_xmethod (struct value *method,
1095 int argc, struct value **argv);
1096
1097 #endif /* !defined (VALUE_H) */