1 /* Definitions for values of C expressions, for GDB.
3 Copyright (C) 1986-2023 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #if !defined (VALUE_H)
23 #include "frame.h" /* For struct frame_id. */
24 #include "extension.h"
25 #include "gdbsupport/gdb_ref_ptr.h"
26 #include "gmp-utils.h"
35 struct value_print_options
;
37 /* Values can be partially 'optimized out' and/or 'unavailable'.
38 These are distinct states and have different string representations
39 and related error strings.
41 'unavailable' has a specific meaning in this context. It means the
42 value exists in the program (at the machine level), but GDB has no
43 means to get to it. Such a value is normally printed as
44 <unavailable>. Examples of how to end up with an unavailable value
47 - We're inspecting a traceframe, and the memory or registers the
48 debug information says the value lives on haven't been collected.
50 - We're inspecting a core dump, the memory or registers the debug
51 information says the value lives aren't present in the dump
52 (that is, we have a partial/trimmed core dump, or we don't fully
53 understand/handle the core dump's format).
55 - We're doing live debugging, but the debug API has no means to
56 get at where the value lives in the machine, like e.g., ptrace
57 not having access to some register or register set.
59 - Any other similar scenario.
61 OTOH, "optimized out" is about what the compiler decided to generate
62 (or not generate). A chunk of a value that was optimized out does
63 not actually exist in the program. There's no way to get at it
64 short of compiling the program differently.
66 A register that has not been saved in a frame is likewise considered
67 optimized out, except not-saved registers have a different string
68 representation and related error strings. E.g., we'll print them as
69 <not-saved> instead of <optimized out>, as in:
73 (gdb) info registers rax
76 If the debug info describes a variable as being in such a register,
77 we'll still print the variable as <optimized out>. IOW, <not saved>
78 is reserved for inspecting registers at the machine level.
80 When comparing value contents, optimized out chunks, unavailable
81 chunks, and valid contents data are all considered different. See
82 value_contents_eq for more info.
85 extern bool overload_resolution
;
87 /* Defines an [OFFSET, OFFSET + LENGTH) range. */
91 /* Lowest offset in the range. */
94 /* Length of the range. */
97 /* Returns true if THIS is strictly less than OTHER, useful for
98 searching. We keep ranges sorted by offset and coalesce
99 overlapping and contiguous ranges, so this just compares the
102 bool operator< (const range
&other
) const
104 return offset
< other
.offset
;
107 /* Returns true if THIS is equal to OTHER. */
108 bool operator== (const range
&other
) const
110 return offset
== other
.offset
&& length
== other
.length
;
114 /* Increase VAL's reference count. */
116 extern void value_incref (struct value
*val
);
118 /* Decrease VAL's reference count. When the reference count drops to
119 0, VAL will be freed. */
121 extern void value_decref (struct value
*val
);
123 /* A policy class to interface gdb::ref_ptr with struct value. */
125 struct value_ref_policy
127 static void incref (struct value
*ptr
)
132 static void decref (struct value
*ptr
)
138 /* A gdb:;ref_ptr pointer to a struct value. */
140 typedef gdb::ref_ptr
<struct value
, value_ref_policy
> value_ref_ptr
;
142 /* Note that the fields in this structure are arranged to save a bit
149 /* Values can only be created via "static constructors". */
150 explicit value (struct type
*type_
)
156 m_in_history (false),
158 m_enclosing_type (type_
)
164 /* Allocate a lazy value for type TYPE. Its actual content is
165 "lazily" allocated too: the content field of the return value is
166 NULL; it will be allocated when it is fetched from the target. */
167 static struct value
*allocate_lazy (struct type
*type
);
171 DISABLE_COPY_AND_ASSIGN (value
);
173 /* Type of the value. */
174 struct type
*type () const
177 /* This is being used to change the type of an existing value, that
178 code should instead be creating a new value with the changed type
179 (but possibly shared content). */
180 void deprecated_set_type (struct type
*type
)
183 /* Return the gdbarch associated with the value. */
184 struct gdbarch
*arch () const;
186 /* Only used for bitfields; number of bits contained in them. */
187 LONGEST
bitsize () const
188 { return m_bitsize
; }
190 void set_bitsize (LONGEST bit
)
193 /* Only used for bitfields; position of start of field. For
194 little-endian targets, it is the position of the LSB. For
195 big-endian targets, it is the position of the MSB. */
196 LONGEST
bitpos () const
199 void set_bitpos (LONGEST bit
)
202 /* Only used for bitfields; the containing value. This allows a
203 single read from the target when displaying multiple
205 value
*parent () const
206 { return m_parent
.get (); }
208 void set_parent (struct value
*parent
)
209 { m_parent
= value_ref_ptr::new_reference (parent
); }
211 /* Describes offset of a value within lval of a structure in bytes.
212 If lval == lval_memory, this is an offset to the address. If
213 lval == lval_register, this is a further offset from
214 location.address within the registers structure. Note also the
215 member embedded_offset below. */
216 LONGEST
offset () const
219 void set_offset (LONGEST offset
)
220 { m_offset
= offset
; }
222 /* The comment from "struct value" reads: ``Is it modifiable? Only
223 relevant if lval != not_lval.''. Shouldn't the value instead be
224 not_lval and be done with it? */
225 int deprecated_modifiable () const
226 { return m_modifiable
; }
228 LONGEST
pointed_to_offset () const
229 { return m_pointed_to_offset
; }
231 void set_pointed_to_offset (LONGEST val
)
232 { m_pointed_to_offset
= val
; }
234 LONGEST
embedded_offset () const
235 { return m_embedded_offset
; }
237 void set_embedded_offset (LONGEST val
)
238 { m_embedded_offset
= val
; }
240 /* If zero, contents of this value are in the contents field. If
241 nonzero, contents are in inferior. If the lval field is lval_memory,
242 the contents are in inferior memory at location.address plus offset.
243 The lval field may also be lval_register.
245 WARNING: This field is used by the code which handles watchpoints
246 (see breakpoint.c) to decide whether a particular value can be
247 watched by hardware watchpoints. If the lazy flag is set for some
248 member of a value chain, it is assumed that this member of the
249 chain doesn't need to be watched as part of watching the value
250 itself. This is how GDB avoids watching the entire struct or array
251 when the user wants to watch a single struct member or array
252 element. If you ever change the way lazy flag is set and reset, be
253 sure to consider this use as well! */
258 void set_lazy (int val
)
262 /* If a value represents a C++ object, then the `type' field gives the
263 object's compile-time type. If the object actually belongs to some
264 class derived from `type', perhaps with other base classes and
265 additional members, then `type' is just a subobject of the real
266 thing, and the full object is probably larger than `type' would
269 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
270 actually determine the object's run-time type by looking at the
271 run-time type information in the vtable. When this information is
272 available, we may elect to read in the entire object, for several
275 - When printing the value, the user would probably rather see the
276 full object, not just the limited portion apparent from the
279 - If `type' has virtual base classes, then even printing `type'
280 alone may require reaching outside the `type' portion of the
281 object to wherever the virtual base class has been stored.
283 When we store the entire object, `enclosing_type' is the run-time
284 type -- the complete object -- and `embedded_offset' is the offset
285 of `type' within that larger type, in bytes. The value_contents()
286 macro takes `embedded_offset' into account, so most GDB code
287 continues to see the `type' portion of the value, just as the
290 If `type' is a pointer to an object, then `enclosing_type' is a
291 pointer to the object's run-time type, and `pointed_to_offset' is
292 the offset in bytes from the full object to the pointed-to object
293 -- that is, the value `embedded_offset' would have if we followed
294 the pointer and fetched the complete object. (I don't really see
295 the point. Why not just determine the run-time type when you
296 indirect, and avoid the special case? The contents don't matter
297 until you indirect anyway.)
299 If we're not doing anything fancy, `enclosing_type' is equal to
300 `type', and `embedded_offset' is zero, so everything works
303 struct type
*enclosing_type () const
304 { return m_enclosing_type
; }
306 void set_enclosing_type (struct type
*new_type
);
311 void set_stack (int val
)
314 /* If this value is lval_computed, return its lval_funcs
316 const struct lval_funcs
*computed_funcs () const;
318 /* If this value is lval_computed, return its closure. The meaning
319 of the returned value depends on the functions this value
321 void *computed_closure () const;
323 enum lval_type
*deprecated_lval_hack ()
326 enum lval_type
lval () const
329 /* Set or return field indicating whether a variable is initialized or
330 not, based on debugging information supplied by the compiler.
331 1 = initialized; 0 = uninitialized. */
332 int initialized () const
333 { return m_initialized
; }
335 void set_initialized (int value
)
336 { m_initialized
= value
; }
338 /* If lval == lval_memory, return the address in the inferior. If
339 lval == lval_register, return the byte offset into the registers
340 structure. Otherwise, return 0. The returned address
341 includes the offset, if any. */
342 CORE_ADDR
address () const;
344 /* Like address, except the result does not include value's
346 CORE_ADDR
raw_address () const;
348 /* Set the address of a value. */
349 void set_address (CORE_ADDR
);
351 struct internalvar
**deprecated_internalvar_hack ()
352 { return &m_location
.internalvar
; }
354 struct frame_id
*deprecated_next_frame_id_hack ();
356 int *deprecated_regnum_hack ();
359 /* Type of value; either not an lval, or one of the various
360 different possible kinds of lval. */
361 enum lval_type m_lval
= not_lval
;
363 /* Is it modifiable? Only relevant if lval != not_lval. */
364 unsigned int m_modifiable
: 1;
366 /* If zero, contents of this value are in the contents field. If
367 nonzero, contents are in inferior. If the lval field is lval_memory,
368 the contents are in inferior memory at location.address plus offset.
369 The lval field may also be lval_register.
371 WARNING: This field is used by the code which handles watchpoints
372 (see breakpoint.c) to decide whether a particular value can be
373 watched by hardware watchpoints. If the lazy flag is set for
374 some member of a value chain, it is assumed that this member of
375 the chain doesn't need to be watched as part of watching the
376 value itself. This is how GDB avoids watching the entire struct
377 or array when the user wants to watch a single struct member or
378 array element. If you ever change the way lazy flag is set and
379 reset, be sure to consider this use as well! */
380 unsigned int m_lazy
: 1;
382 /* If value is a variable, is it initialized or not. */
383 unsigned int m_initialized
: 1;
385 /* If value is from the stack. If this is set, read_stack will be
386 used instead of read_memory to enable extra caching. */
387 unsigned int m_stack
: 1;
389 /* True if this is a zero value, created by 'value_zero'; false
393 /* True if this a value recorded in value history; false otherwise. */
394 bool m_in_history
: 1;
396 /* Location of value (if lval). */
399 /* If lval == lval_memory, this is the address in the inferior */
402 /*If lval == lval_register, the value is from a register. */
405 /* Register number. */
407 /* Frame ID of "next" frame to which a register value is relative.
408 If the register value is found relative to frame F, then the
409 frame id of F->next will be stored in next_frame_id. */
410 struct frame_id next_frame_id
;
413 /* Pointer to internal variable. */
414 struct internalvar
*internalvar
;
416 /* Pointer to xmethod worker. */
417 struct xmethod_worker
*xm_worker
;
419 /* If lval == lval_computed, this is a set of function pointers
420 to use to access and describe the value, and a closure pointer
424 /* Functions to call. */
425 const struct lval_funcs
*funcs
;
427 /* Closure for those functions to use. */
432 /* Describes offset of a value within lval of a structure in target
433 addressable memory units. Note also the member embedded_offset
435 LONGEST m_offset
= 0;
437 /* Only used for bitfields; number of bits contained in them. */
438 LONGEST m_bitsize
= 0;
440 /* Only used for bitfields; position of start of field. For
441 little-endian targets, it is the position of the LSB. For
442 big-endian targets, it is the position of the MSB. */
443 LONGEST m_bitpos
= 0;
445 /* The number of references to this value. When a value is created,
446 the value chain holds a reference, so REFERENCE_COUNT is 1. If
447 release_value is called, this value is removed from the chain but
448 the caller of release_value now has a reference to this value.
449 The caller must arrange for a call to value_free later. */
450 int m_reference_count
= 1;
452 /* Only used for bitfields; the containing value. This allows a
453 single read from the target when displaying multiple
455 value_ref_ptr m_parent
;
457 /* Type of the value. */
460 /* If a value represents a C++ object, then the `type' field gives
461 the object's compile-time type. If the object actually belongs
462 to some class derived from `type', perhaps with other base
463 classes and additional members, then `type' is just a subobject
464 of the real thing, and the full object is probably larger than
465 `type' would suggest.
467 If `type' is a dynamic class (i.e. one with a vtable), then GDB
468 can actually determine the object's run-time type by looking at
469 the run-time type information in the vtable. When this
470 information is available, we may elect to read in the entire
471 object, for several reasons:
473 - When printing the value, the user would probably rather see the
474 full object, not just the limited portion apparent from the
477 - If `type' has virtual base classes, then even printing `type'
478 alone may require reaching outside the `type' portion of the
479 object to wherever the virtual base class has been stored.
481 When we store the entire object, `enclosing_type' is the run-time
482 type -- the complete object -- and `embedded_offset' is the
483 offset of `type' within that larger type, in target addressable memory
484 units. The value_contents() macro takes `embedded_offset' into account,
485 so most GDB code continues to see the `type' portion of the value, just
486 as the inferior would.
488 If `type' is a pointer to an object, then `enclosing_type' is a
489 pointer to the object's run-time type, and `pointed_to_offset' is
490 the offset in target addressable memory units from the full object
491 to the pointed-to object -- that is, the value `embedded_offset' would
492 have if we followed the pointer and fetched the complete object.
493 (I don't really see the point. Why not just determine the
494 run-time type when you indirect, and avoid the special case? The
495 contents don't matter until you indirect anyway.)
497 If we're not doing anything fancy, `enclosing_type' is equal to
498 `type', and `embedded_offset' is zero, so everything works
500 struct type
*m_enclosing_type
;
501 LONGEST m_embedded_offset
= 0;
502 LONGEST m_pointed_to_offset
= 0;
504 /* Actual contents of the value. Target byte-order.
506 May be nullptr if the value is lazy or is entirely optimized out.
507 Guaranteed to be non-nullptr otherwise. */
508 gdb::unique_xmalloc_ptr
<gdb_byte
> m_contents
;
510 /* Unavailable ranges in CONTENTS. We mark unavailable ranges,
511 rather than available, since the common and default case is for a
512 value to be available. This is filled in at value read time.
513 The unavailable ranges are tracked in bits. Note that a contents
514 bit that has been optimized out doesn't really exist in the
515 program, so it can't be marked unavailable either. */
516 std::vector
<range
> m_unavailable
;
518 /* Likewise, but for optimized out contents (a chunk of the value of
519 a variable that does not actually exist in the program). If LVAL
520 is lval_register, this is a register ($pc, $sp, etc., never a
521 program variable) that has not been saved in the frame. Not
522 saved registers and optimized-out program variables values are
523 treated pretty much the same, except not-saved registers have a
524 different string representation and related error strings. */
525 std::vector
<range
> m_optimized_out
;
527 /* This is only non-zero for values of TYPE_CODE_ARRAY and if the size of
528 the array in inferior memory is greater than max_value_size. If these
529 conditions are met then, when the value is loaded from the inferior
530 GDB will only load a portion of the array into memory, and
531 limited_length will be set to indicate the length in octets that were
532 loaded from the inferior. */
533 ULONGEST m_limited_length
= 0;
536 /* Returns value_type or value_enclosing_type depending on
537 value_print_options.objectprint.
539 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
540 only for pointers and references, else it will be returned
541 for all the types (e.g. structures). This option is useful
542 to prevent retrieving enclosing type for the base classes fields.
544 REAL_TYPE_FOUND is used to inform whether the real type was found
545 (or just static type was used). The NULL may be passed if it is not
548 extern struct type
*value_actual_type (struct value
*value
,
549 int resolve_simple_types
,
550 int *real_type_found
);
552 /* For lval_computed values, this structure holds functions used to
553 retrieve and set the value (or portions of the value).
555 For each function, 'V' is the 'this' pointer: an lval_funcs
556 function F may always assume that the V it receives is an
557 lval_computed value, and has F in the appropriate slot of its
558 lval_funcs structure. */
562 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
563 a problem arises in obtaining VALUE's bits, this function should
564 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
565 non-optimized-out value is an internal error. */
566 void (*read
) (struct value
*v
);
568 /* Handle an assignment TOVAL = FROMVAL by writing the value of
569 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
570 been updated. If a problem arises in doing so, this function
571 should call 'error'. If it is NULL such TOVAL assignment is an error as
572 TOVAL is not considered as an lvalue. */
573 void (*write
) (struct value
*toval
, struct value
*fromval
);
575 /* Return true if any part of V is optimized out, false otherwise.
576 This will only be called for lazy values -- if the value has been
577 fetched, then the value's optimized-out bits are consulted
579 bool (*is_optimized_out
) (struct value
*v
);
581 /* If non-NULL, this is used to implement pointer indirection for
582 this value. This method may return NULL, in which case value_ind
583 will fall back to ordinary indirection. */
584 struct value
*(*indirect
) (struct value
*value
);
586 /* If non-NULL, this is used to implement reference resolving for
587 this value. This method may return NULL, in which case coerce_ref
588 will fall back to ordinary references resolving. */
589 struct value
*(*coerce_ref
) (const struct value
*value
);
591 /* If non-NULL, this is used to determine whether the indicated bits
592 of VALUE are a synthetic pointer. */
593 int (*check_synthetic_pointer
) (const struct value
*value
,
594 LONGEST offset
, int length
);
596 /* Return a duplicate of VALUE's closure, for use in a new value.
597 This may simply return the same closure, if VALUE's is
598 reference-counted or statically allocated.
600 This may be NULL, in which case VALUE's closure is re-used in the
602 void *(*copy_closure
) (const struct value
*v
);
604 /* Drop VALUE's reference to its closure. Maybe this frees the
605 closure; maybe this decrements a reference count; maybe the
606 closure is statically allocated and this does nothing.
608 This may be NULL, in which case no action is taken to free
610 void (*free_closure
) (struct value
*v
);
613 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
614 and closure CLOSURE. */
616 extern struct value
*allocate_computed_value (struct type
*type
,
617 const struct lval_funcs
*funcs
,
620 extern struct value
*allocate_optimized_out_value (struct type
*type
);
622 /* Throw an error complaining that the value has been optimized
625 extern void error_value_optimized_out (void);
627 /* value_contents() and value_contents_raw() both return the address
628 of the gdb buffer used to hold a copy of the contents of the lval.
629 value_contents() is used when the contents of the buffer are needed
630 -- it uses value_fetch_lazy() to load the buffer from the process
631 being debugged if it hasn't already been loaded
632 (value_contents_writeable() is used when a writeable but fetched
633 buffer is required).. value_contents_raw() is used when data is
634 being stored into the buffer, or when it is certain that the
635 contents of the buffer are valid.
637 Note: The contents pointer is adjusted by the offset required to
638 get to the real subobject, if the value happens to represent
639 something embedded in a larger run-time object. */
641 extern gdb::array_view
<gdb_byte
> value_contents_raw (struct value
*);
643 /* Actual contents of the value. For use of this value; setting it
644 uses the stuff above. Not valid if lazy is nonzero. Target
645 byte-order. We force it to be aligned properly for any possible
646 value. Note that a value therefore extends beyond what is
649 extern gdb::array_view
<const gdb_byte
> value_contents (struct value
*);
650 extern gdb::array_view
<gdb_byte
> value_contents_writeable (struct value
*);
652 /* The ALL variants of the above two macros do not adjust the returned
653 pointer by the embedded_offset value. */
655 extern gdb::array_view
<gdb_byte
> value_contents_all_raw (struct value
*);
656 extern gdb::array_view
<const gdb_byte
> value_contents_all (struct value
*);
658 /* Like value_contents_all, but does not require that the returned
659 bits be valid. This should only be used in situations where you
660 plan to check the validity manually. */
661 extern gdb::array_view
<const gdb_byte
> value_contents_for_printing (struct value
*value
);
663 /* Like value_contents_for_printing, but accepts a constant value
664 pointer. Unlike value_contents_for_printing however, the pointed
665 value must _not_ be lazy. */
666 extern gdb::array_view
<const gdb_byte
>
667 value_contents_for_printing_const (const struct value
*value
);
669 extern void value_fetch_lazy (struct value
*val
);
671 /* If nonzero, this is the value of a variable which does not actually
672 exist in the program, at least partially. If the value is lazy,
673 this may fetch it now. */
674 extern int value_optimized_out (struct value
*value
);
676 /* Given a value, return true if any of the contents bits starting at
677 OFFSET and extending for LENGTH bits is optimized out, false
680 extern int value_bits_any_optimized_out (const struct value
*value
,
681 int bit_offset
, int bit_length
);
683 /* Like value_optimized_out, but return true iff the whole value is
685 extern int value_entirely_optimized_out (struct value
*value
);
687 /* Mark VALUE's content bytes starting at OFFSET and extending for
688 LENGTH bytes as optimized out. */
690 extern void mark_value_bytes_optimized_out (struct value
*value
,
691 int offset
, int length
);
693 /* Mark VALUE's content bits starting at OFFSET and extending for
694 LENGTH bits as optimized out. */
696 extern void mark_value_bits_optimized_out (struct value
*value
,
697 LONGEST offset
, LONGEST length
);
699 /* Set COMPONENT's location as appropriate for a component of WHOLE
700 --- regardless of what kind of lvalue WHOLE is. */
701 extern void set_value_component_location (struct value
*component
,
702 const struct value
*whole
);
704 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
705 single value might have multiple LVALs), this hacked interface is
706 limited to just the first PIECE. Expect further change. */
707 /* Type of value; either not an lval, or one of the various different
708 possible kinds of lval. */
709 #define VALUE_LVAL(val) (*((val)->deprecated_lval_hack ()))
711 /* Pointer to internal variable. */
712 #define VALUE_INTERNALVAR(val) (*((val)->deprecated_internalvar_hack ()))
714 /* Frame ID of "next" frame to which a register value is relative. A
715 register value is indicated by VALUE_LVAL being set to lval_register.
716 So, if the register value is found relative to frame F, then the
717 frame id of F->next will be stored in VALUE_NEXT_FRAME_ID. */
718 #define VALUE_NEXT_FRAME_ID(val) (*((val)->deprecated_next_frame_id_hack ()))
720 /* Register number if the value is from a register. */
721 #define VALUE_REGNUM(val) (*((val)->deprecated_regnum_hack ()))
723 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
724 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
726 extern struct value
*coerce_ref_if_computed (const struct value
*arg
);
728 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
729 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
730 ORIGINAL_VAL are the type and value of the original reference or
731 pointer. ORIGINAL_VALUE_ADDRESS is the address within VALUE, that is
732 the address that was dereferenced.
734 Note, that VALUE is modified by this function.
736 It is a common implementation for coerce_ref and value_ind. */
738 extern struct value
* readjust_indirect_value_type (struct value
*value
,
739 struct type
*enc_type
,
740 const struct type
*original_type
,
741 struct value
*original_val
,
742 CORE_ADDR original_value_address
);
744 /* Convert a REF to the object referenced. */
746 extern struct value
*coerce_ref (struct value
*value
);
748 /* If ARG is an array, convert it to a pointer.
749 If ARG is a function, convert it to a function pointer.
751 References are dereferenced. */
753 extern struct value
*coerce_array (struct value
*value
);
755 /* Given a value, determine whether the bits starting at OFFSET and
756 extending for LENGTH bits are a synthetic pointer. */
758 extern int value_bits_synthetic_pointer (const struct value
*value
,
759 LONGEST offset
, LONGEST length
);
761 /* Given a value, determine whether the contents bytes starting at
762 OFFSET and extending for LENGTH bytes are available. This returns
763 nonzero if all bytes in the given range are available, zero if any
764 byte is unavailable. */
766 extern int value_bytes_available (const struct value
*value
,
767 LONGEST offset
, ULONGEST length
);
769 /* Given a value, determine whether the contents bits starting at
770 OFFSET and extending for LENGTH bits are available. This returns
771 nonzero if all bits in the given range are available, zero if any
772 bit is unavailable. */
774 extern int value_bits_available (const struct value
*value
,
775 LONGEST offset
, ULONGEST length
);
777 /* Like value_bytes_available, but return false if any byte in the
778 whole object is unavailable. */
779 extern int value_entirely_available (struct value
*value
);
781 /* Like value_entirely_available, but return false if any byte in the
782 whole object is available. */
783 extern int value_entirely_unavailable (struct value
*value
);
785 /* Mark VALUE's content bytes starting at OFFSET and extending for
786 LENGTH bytes as unavailable. */
788 extern void mark_value_bytes_unavailable (struct value
*value
,
789 LONGEST offset
, ULONGEST length
);
791 /* Mark VALUE's content bits starting at OFFSET and extending for
792 LENGTH bits as unavailable. */
794 extern void mark_value_bits_unavailable (struct value
*value
,
795 LONGEST offset
, ULONGEST length
);
797 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
798 LENGTH bytes of VAL2's contents starting at OFFSET2.
800 Note that "contents" refers to the whole value's contents
801 (value_contents_all), without any embedded offset adjustment. For
802 example, to compare a complete object value with itself, including
803 its enclosing type chunk, you'd do:
805 int len = check_typedef (val->enclosing_type ())->length ();
806 value_contents_eq (val, 0, val, 0, len);
808 Returns true iff the set of available/valid contents match.
810 Optimized-out contents are equal to optimized-out contents, and are
811 not equal to non-optimized-out contents.
813 Unavailable contents are equal to unavailable contents, and are not
814 equal to non-unavailable contents.
816 For example, if 'x's represent an unavailable byte, and 'V' and 'Z'
817 represent different available/valid bytes, in a value with length
821 contents: xxxxVVVVxxxxVVZZ
825 value_contents_eq(val, 0, val, 8, 6) => true
826 value_contents_eq(val, 0, val, 4, 4) => false
827 value_contents_eq(val, 0, val, 8, 8) => false
828 value_contents_eq(val, 4, val, 12, 2) => true
829 value_contents_eq(val, 4, val, 12, 4) => true
830 value_contents_eq(val, 3, val, 4, 4) => true
832 If 'x's represent an unavailable byte, 'o' represents an optimized
833 out byte, in a value with length 8:
840 value_contents_eq(val, 0, val, 2, 2) => true
841 value_contents_eq(val, 4, val, 6, 2) => true
842 value_contents_eq(val, 0, val, 4, 4) => true
844 We only know whether a value chunk is unavailable or optimized out
845 if we've tried to read it. As this routine is used by printing
846 routines, which may be printing values in the value history, long
847 after the inferior is gone, it works with const values. Therefore,
848 this routine must not be called with lazy values. */
850 extern bool value_contents_eq (const struct value
*val1
, LONGEST offset1
,
851 const struct value
*val2
, LONGEST offset2
,
854 /* An overload of value_contents_eq that compares the entirety of both
857 extern bool value_contents_eq (const struct value
*val1
,
858 const struct value
*val2
);
860 /* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
861 which is (or will be copied to) VAL's contents buffer offset by
862 BIT_OFFSET bits. Marks value contents ranges as unavailable if
863 the corresponding memory is likewise unavailable. STACK indicates
864 whether the memory is known to be stack memory. */
866 extern void read_value_memory (struct value
*val
, LONGEST bit_offset
,
867 int stack
, CORE_ADDR memaddr
,
868 gdb_byte
*buffer
, size_t length
);
870 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
871 into each element of a new vector value with VECTOR_TYPE. */
873 struct value
*value_vector_widen (struct value
*scalar_value
,
874 struct type
*vector_type
);
879 #include "gdbtypes.h"
880 #include "expression.h"
882 class frame_info_ptr
;
885 extern int print_address_demangle (const struct value_print_options
*,
886 struct gdbarch
*, CORE_ADDR
,
887 struct ui_file
*, int);
889 /* Returns true if VAL is of floating-point type. In addition,
890 throws an error if the value is an invalid floating-point value. */
891 extern bool is_floating_value (struct value
*val
);
893 extern LONGEST
value_as_long (struct value
*val
);
894 extern CORE_ADDR
value_as_address (struct value
*val
);
896 extern LONGEST
unpack_long (struct type
*type
, const gdb_byte
*valaddr
);
897 extern CORE_ADDR
unpack_pointer (struct type
*type
, const gdb_byte
*valaddr
);
899 extern LONGEST
unpack_field_as_long (struct type
*type
,
900 const gdb_byte
*valaddr
,
903 /* Unpack a bitfield of the specified FIELD_TYPE, from the object at
904 VALADDR, and store the result in *RESULT.
905 The bitfield starts at BITPOS bits and contains BITSIZE bits; if
906 BITSIZE is zero, then the length is taken from FIELD_TYPE.
908 Extracting bits depends on endianness of the machine. Compute the
909 number of least significant bits to discard. For big endian machines,
910 we compute the total number of bits in the anonymous object, subtract
911 off the bit count from the MSB of the object to the MSB of the
912 bitfield, then the size of the bitfield, which leaves the LSB discard
913 count. For little endian machines, the discard count is simply the
914 number of bits from the LSB of the anonymous object to the LSB of the
917 If the field is signed, we also do sign extension. */
919 extern LONGEST
unpack_bits_as_long (struct type
*field_type
,
920 const gdb_byte
*valaddr
,
921 LONGEST bitpos
, LONGEST bitsize
);
923 extern int unpack_value_field_as_long (struct type
*type
, const gdb_byte
*valaddr
,
924 LONGEST embedded_offset
, int fieldno
,
925 const struct value
*val
, LONGEST
*result
);
927 extern void unpack_value_bitfield (struct value
*dest_val
,
928 LONGEST bitpos
, LONGEST bitsize
,
929 const gdb_byte
*valaddr
,
930 LONGEST embedded_offset
,
931 const struct value
*val
);
933 extern struct value
*value_field_bitfield (struct type
*type
, int fieldno
,
934 const gdb_byte
*valaddr
,
935 LONGEST embedded_offset
,
936 const struct value
*val
);
938 extern void pack_long (gdb_byte
*buf
, struct type
*type
, LONGEST num
);
940 extern struct value
*value_from_longest (struct type
*type
, LONGEST num
);
941 extern struct value
*value_from_ulongest (struct type
*type
, ULONGEST num
);
942 extern struct value
*value_from_pointer (struct type
*type
, CORE_ADDR addr
);
943 extern struct value
*value_from_host_double (struct type
*type
, double d
);
944 extern struct value
*value_from_history_ref (const char *, const char **);
945 extern struct value
*value_from_component (struct value
*, struct type
*,
949 /* Create a new value by extracting it from WHOLE. TYPE is the type
950 of the new value. BIT_OFFSET and BIT_LENGTH describe the offset
951 and field width of the value to extract from WHOLE -- BIT_LENGTH
952 may differ from TYPE's length in the case where WHOLE's type is
955 When the value does come from a non-byte-aligned offset or field
956 width, it will be marked non_lval. */
958 extern struct value
*value_from_component_bitsize (struct value
*whole
,
963 extern struct value
*value_at (struct type
*type
, CORE_ADDR addr
);
964 extern struct value
*value_at_lazy (struct type
*type
, CORE_ADDR addr
);
966 /* Like value_at, but ensures that the result is marked not_lval.
967 This can be important if the memory is "volatile". */
968 extern struct value
*value_at_non_lval (struct type
*type
, CORE_ADDR addr
);
970 extern struct value
*value_from_contents_and_address_unresolved
971 (struct type
*, const gdb_byte
*, CORE_ADDR
);
972 extern struct value
*value_from_contents_and_address (struct type
*,
975 extern struct value
*value_from_contents (struct type
*, const gdb_byte
*);
977 extern struct value
*default_value_from_register (struct gdbarch
*gdbarch
,
980 struct frame_id frame_id
);
982 extern void read_frame_register_value (struct value
*value
,
983 frame_info_ptr frame
);
985 extern struct value
*value_from_register (struct type
*type
, int regnum
,
986 frame_info_ptr frame
);
988 extern CORE_ADDR
address_from_register (int regnum
,
989 frame_info_ptr frame
);
991 extern struct value
*value_of_variable (struct symbol
*var
,
992 const struct block
*b
);
994 extern struct value
*address_of_variable (struct symbol
*var
,
995 const struct block
*b
);
997 extern struct value
*value_of_register (int regnum
, frame_info_ptr frame
);
999 struct value
*value_of_register_lazy (frame_info_ptr frame
, int regnum
);
1001 /* Return the symbol's reading requirement. */
1003 extern enum symbol_needs_kind
symbol_read_needs (struct symbol
*);
1005 /* Return true if the symbol needs a frame. This is a wrapper for
1006 symbol_read_needs that simply checks for SYMBOL_NEEDS_FRAME. */
1008 extern int symbol_read_needs_frame (struct symbol
*);
1010 extern struct value
*read_var_value (struct symbol
*var
,
1011 const struct block
*var_block
,
1012 frame_info_ptr frame
);
1014 extern struct value
*allocate_value (struct type
*type
);
1016 extern void value_contents_copy (struct value
*dst
, LONGEST dst_offset
,
1017 struct value
*src
, LONGEST src_offset
,
1020 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
1022 extern struct value
*value_mark (void);
1024 extern void value_free_to_mark (const struct value
*mark
);
1026 /* A helper class that uses value_mark at construction time and calls
1027 value_free_to_mark in the destructor. This is used to clear out
1028 temporary values created during the lifetime of this object. */
1029 class scoped_value_mark
1033 scoped_value_mark ()
1034 : m_value (value_mark ())
1038 ~scoped_value_mark ()
1043 scoped_value_mark (scoped_value_mark
&&other
) = default;
1045 DISABLE_COPY_AND_ASSIGN (scoped_value_mark
);
1047 /* Free the values currently on the value stack. */
1048 void free_to_mark ()
1050 if (m_value
!= NULL
)
1052 value_free_to_mark (m_value
);
1059 const struct value
*m_value
;
1062 extern struct value
*value_cstring (const char *ptr
, ssize_t len
,
1063 struct type
*char_type
);
1064 extern struct value
*value_string (const char *ptr
, ssize_t len
,
1065 struct type
*char_type
);
1067 extern struct value
*value_array (int lowbound
, int highbound
,
1068 struct value
**elemvec
);
1070 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
1072 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
1073 enum exp_opcode op
);
1075 extern struct value
*value_ptradd (struct value
*arg1
, LONGEST arg2
);
1077 extern LONGEST
value_ptrdiff (struct value
*arg1
, struct value
*arg2
);
1079 /* Return true if VAL does not live in target memory, but should in order
1080 to operate on it. Otherwise return false. */
1082 extern bool value_must_coerce_to_target (struct value
*arg1
);
1084 extern struct value
*value_coerce_to_target (struct value
*arg1
);
1086 extern struct value
*value_coerce_array (struct value
*arg1
);
1088 extern struct value
*value_coerce_function (struct value
*arg1
);
1090 extern struct value
*value_ind (struct value
*arg1
);
1092 extern struct value
*value_addr (struct value
*arg1
);
1094 extern struct value
*value_ref (struct value
*arg1
, enum type_code refcode
);
1096 extern struct value
*value_assign (struct value
*toval
,
1097 struct value
*fromval
);
1099 extern struct value
*value_pos (struct value
*arg1
);
1101 extern struct value
*value_neg (struct value
*arg1
);
1103 extern struct value
*value_complement (struct value
*arg1
);
1105 extern struct value
*value_struct_elt (struct value
**argp
,
1106 gdb::optional
<gdb::array_view
<value
*>> args
,
1107 const char *name
, int *static_memfuncp
,
1110 extern struct value
*value_struct_elt_bitpos (struct value
**argp
,
1112 struct type
*field_type
,
1115 extern struct value
*value_aggregate_elt (struct type
*curtype
,
1117 struct type
*expect_type
,
1119 enum noside noside
);
1121 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
1123 enum oload_search_type
{ NON_METHOD
, METHOD
, BOTH
};
1125 extern int find_overload_match (gdb::array_view
<value
*> args
,
1127 enum oload_search_type method
,
1128 struct value
**objp
, struct symbol
*fsym
,
1129 struct value
**valp
, struct symbol
**symp
,
1130 int *staticp
, const int no_adl
,
1131 enum noside noside
);
1133 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
1135 extern struct value
*value_primitive_field (struct value
*arg1
, LONGEST offset
,
1137 struct type
*arg_type
);
1140 extern struct type
*value_rtti_indirect_type (struct value
*, int *, LONGEST
*,
1143 extern struct value
*value_full_object (struct value
*, struct type
*, int,
1146 extern struct value
*value_cast_pointers (struct type
*, struct value
*, int);
1148 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
1150 extern struct value
*value_reinterpret_cast (struct type
*type
,
1153 extern struct value
*value_dynamic_cast (struct type
*type
, struct value
*arg
);
1155 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
1157 extern struct value
*value_one (struct type
*type
);
1159 extern struct value
*value_repeat (struct value
*arg1
, int count
);
1161 extern struct value
*value_subscript (struct value
*array
, LONGEST index
);
1163 extern struct value
*value_bitstring_subscript (struct type
*type
,
1164 struct value
*bitstring
,
1167 extern struct value
*register_value_being_returned (struct type
*valtype
,
1168 struct regcache
*retbuf
);
1170 extern int value_in (struct value
*element
, struct value
*set
);
1172 extern int value_bit_index (struct type
*type
, const gdb_byte
*addr
,
1175 extern enum return_value_convention
1176 struct_return_convention (struct gdbarch
*gdbarch
, struct value
*function
,
1177 struct type
*value_type
);
1179 extern int using_struct_return (struct gdbarch
*gdbarch
,
1180 struct value
*function
,
1181 struct type
*value_type
);
1183 /* Evaluate the expression EXP. If set, EXPECT_TYPE is passed to the
1184 outermost operation's evaluation. This is ignored by most
1185 operations, but may be used, e.g., to determine the type of an
1186 otherwise untyped symbol. The caller should not assume that the
1187 returned value has this type. */
1189 extern struct value
*evaluate_expression (struct expression
*exp
,
1190 struct type
*expect_type
= nullptr);
1192 extern struct value
*evaluate_type (struct expression
*exp
);
1194 extern value
*evaluate_var_value (enum noside noside
, const block
*blk
,
1197 extern value
*evaluate_var_msym_value (enum noside noside
,
1198 struct objfile
*objfile
,
1199 minimal_symbol
*msymbol
);
1201 namespace expr
{ class operation
; };
1202 extern void fetch_subexp_value (struct expression
*exp
,
1203 expr::operation
*op
,
1204 struct value
**valp
, struct value
**resultp
,
1205 std::vector
<value_ref_ptr
> *val_chain
,
1206 bool preserve_errors
);
1208 extern struct value
*parse_and_eval (const char *exp
);
1210 extern struct value
*parse_to_comma_and_eval (const char **expp
);
1212 extern struct type
*parse_and_eval_type (const char *p
, int length
);
1214 extern CORE_ADDR
parse_and_eval_address (const char *exp
);
1216 extern LONGEST
parse_and_eval_long (const char *exp
);
1218 extern void unop_promote (const struct language_defn
*language
,
1219 struct gdbarch
*gdbarch
,
1220 struct value
**arg1
);
1222 extern void binop_promote (const struct language_defn
*language
,
1223 struct gdbarch
*gdbarch
,
1224 struct value
**arg1
, struct value
**arg2
);
1226 extern struct value
*access_value_history (int num
);
1228 /* Return the number of items in the value history. */
1230 extern ULONGEST
value_history_count ();
1232 extern struct value
*value_of_internalvar (struct gdbarch
*gdbarch
,
1233 struct internalvar
*var
);
1235 extern int get_internalvar_integer (struct internalvar
*var
, LONGEST
*l
);
1237 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
1239 extern void set_internalvar_integer (struct internalvar
*var
, LONGEST l
);
1241 extern void set_internalvar_string (struct internalvar
*var
,
1242 const char *string
);
1244 extern void clear_internalvar (struct internalvar
*var
);
1246 extern void set_internalvar_component (struct internalvar
*var
,
1248 LONGEST bitpos
, LONGEST bitsize
,
1249 struct value
*newvalue
);
1251 extern struct internalvar
*lookup_only_internalvar (const char *name
);
1253 extern struct internalvar
*create_internalvar (const char *name
);
1255 extern void complete_internalvar (completion_tracker
&tracker
,
1258 /* An internalvar can be dynamically computed by supplying a vector of
1259 function pointers to perform various operations. */
1261 struct internalvar_funcs
1263 /* Compute the value of the variable. The DATA argument passed to
1264 the function is the same argument that was passed to
1265 `create_internalvar_type_lazy'. */
1267 struct value
*(*make_value
) (struct gdbarch
*arch
,
1268 struct internalvar
*var
,
1271 /* Update the agent expression EXPR with bytecode to compute the
1272 value. VALUE is the agent value we are updating. The DATA
1273 argument passed to this function is the same argument that was
1274 passed to `create_internalvar_type_lazy'. If this pointer is
1275 NULL, then the internalvar cannot be compiled to an agent
1278 void (*compile_to_ax
) (struct internalvar
*var
,
1279 struct agent_expr
*expr
,
1280 struct axs_value
*value
,
1284 extern struct internalvar
*create_internalvar_type_lazy (const char *name
,
1285 const struct internalvar_funcs
*funcs
,
1288 /* Compile an internal variable to an agent expression. VAR is the
1289 variable to compile; EXPR and VALUE are the agent expression we are
1290 updating. This will return 0 if there is no known way to compile
1291 VAR, and 1 if VAR was successfully compiled. It may also throw an
1292 exception on error. */
1294 extern int compile_internalvar_to_ax (struct internalvar
*var
,
1295 struct agent_expr
*expr
,
1296 struct axs_value
*value
);
1298 extern struct internalvar
*lookup_internalvar (const char *name
);
1300 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
1302 extern int value_equal_contents (struct value
*arg1
, struct value
*arg2
);
1304 extern int value_less (struct value
*arg1
, struct value
*arg2
);
1306 /* Simulate the C operator ! -- return true if ARG1 contains zero. */
1307 extern bool value_logical_not (struct value
*arg1
);
1309 /* Returns true if the value VAL represents a true value. */
1311 value_true (struct value
*val
)
1313 return !value_logical_not (val
);
1318 extern struct value
*value_of_this (const struct language_defn
*lang
);
1320 extern struct value
*value_of_this_silent (const struct language_defn
*lang
);
1322 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
1324 enum exp_opcode otherop
,
1325 enum noside noside
);
1327 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
1328 enum noside noside
);
1330 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
1331 int j
, struct type
*type
, LONGEST offset
);
1333 extern int binop_types_user_defined_p (enum exp_opcode op
,
1335 struct type
*type2
);
1337 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
1338 struct value
*arg2
);
1340 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
1342 extern int destructor_name_p (const char *name
, struct type
*type
);
1344 extern value_ref_ptr
release_value (struct value
*val
);
1346 extern int record_latest_value (struct value
*val
);
1348 extern void modify_field (struct type
*type
, gdb_byte
*addr
,
1349 LONGEST fieldval
, LONGEST bitpos
, LONGEST bitsize
);
1351 extern void type_print (struct type
*type
, const char *varstring
,
1352 struct ui_file
*stream
, int show
);
1354 extern std::string
type_to_string (struct type
*type
);
1356 extern gdb_byte
*baseclass_addr (struct type
*type
, int index
,
1358 struct value
**valuep
, int *errp
);
1360 extern void print_longest (struct ui_file
*stream
, int format
,
1361 int use_local
, LONGEST val
);
1363 extern void print_floating (const gdb_byte
*valaddr
, struct type
*type
,
1364 struct ui_file
*stream
);
1366 extern void value_print (struct value
*val
, struct ui_file
*stream
,
1367 const struct value_print_options
*options
);
1369 /* Release values from the value chain and return them. Values
1370 created after MARK are released. If MARK is nullptr, or if MARK is
1371 not found on the value chain, then all values are released. Values
1372 are returned in reverse order of creation; that is, newest
1375 extern std::vector
<value_ref_ptr
> value_release_to_mark
1376 (const struct value
*mark
);
1378 extern void common_val_print (struct value
*val
,
1379 struct ui_file
*stream
, int recurse
,
1380 const struct value_print_options
*options
,
1381 const struct language_defn
*language
);
1383 extern int val_print_string (struct type
*elttype
, const char *encoding
,
1384 CORE_ADDR addr
, int len
,
1385 struct ui_file
*stream
,
1386 const struct value_print_options
*options
);
1388 extern void print_variable_and_value (const char *name
,
1390 frame_info_ptr frame
,
1391 struct ui_file
*stream
,
1394 extern void typedef_print (struct type
*type
, struct symbol
*news
,
1395 struct ui_file
*stream
);
1397 extern const char *internalvar_name (const struct internalvar
*var
);
1399 extern void preserve_values (struct objfile
*);
1403 extern struct value
*value_copy (const value
*);
1405 extern struct value
*value_non_lval (struct value
*);
1407 extern void value_force_lval (struct value
*, CORE_ADDR
);
1409 extern struct value
*make_cv_value (int, int, struct value
*);
1411 extern void preserve_one_value (struct value
*, struct objfile
*, htab_t
);
1415 extern struct value
*varying_to_slice (struct value
*);
1417 extern struct value
*value_slice (struct value
*, int, int);
1419 /* Create a complex number. The type is the complex type; the values
1420 are cast to the underlying scalar type before the complex number is
1423 extern struct value
*value_literal_complex (struct value
*, struct value
*,
1426 /* Return the real part of a complex value. */
1428 extern struct value
*value_real_part (struct value
*value
);
1430 /* Return the imaginary part of a complex value. */
1432 extern struct value
*value_imaginary_part (struct value
*value
);
1434 extern struct value
*find_function_in_inferior (const char *,
1437 extern struct value
*value_allocate_space_in_inferior (int);
1439 /* User function handler. */
1441 typedef struct value
*(*internal_function_fn
) (struct gdbarch
*gdbarch
,
1442 const struct language_defn
*language
,
1445 struct value
**argv
);
1447 /* Add a new internal function. NAME is the name of the function; DOC
1448 is a documentation string describing the function. HANDLER is
1449 called when the function is invoked. COOKIE is an arbitrary
1450 pointer which is passed to HANDLER and is intended for "user
1453 extern void add_internal_function (const char *name
, const char *doc
,
1454 internal_function_fn handler
,
1457 /* This overload takes an allocated documentation string. */
1459 extern void add_internal_function (gdb::unique_xmalloc_ptr
<char> &&name
,
1460 gdb::unique_xmalloc_ptr
<char> &&doc
,
1461 internal_function_fn handler
,
1464 struct value
*call_internal_function (struct gdbarch
*gdbarch
,
1465 const struct language_defn
*language
,
1466 struct value
*function
,
1467 int argc
, struct value
**argv
);
1469 const char *value_internal_function_name (struct value
*);
1471 /* Build a value wrapping and representing WORKER. The value takes ownership
1472 of the xmethod_worker object. */
1474 extern struct value
*value_from_xmethod (xmethod_worker_up
&&worker
);
1476 extern struct type
*result_type_of_xmethod (struct value
*method
,
1477 gdb::array_view
<value
*> argv
);
1479 extern struct value
*call_xmethod (struct value
*method
,
1480 gdb::array_view
<value
*> argv
);
1482 /* Destroy the values currently allocated. This is called when GDB is
1483 exiting (e.g., on quit_force). */
1484 extern void finalize_values ();
1486 /* Convert VALUE to a gdb_mpq. The caller must ensure that VALUE is
1487 of floating-point, fixed-point, or integer type. */
1488 extern gdb_mpq
value_to_gdb_mpq (struct value
*value
);
1490 /* While an instance of this class is live, and array values that are
1491 created, that are larger than max_value_size, will be restricted in size
1492 to a particular number of elements. */
1494 struct scoped_array_length_limiting
1496 /* Limit any large array values to only contain ELEMENTS elements. */
1497 scoped_array_length_limiting (int elements
);
1499 /* Restore the previous array value limit. */
1500 ~scoped_array_length_limiting ();
1503 /* Used to hold the previous array value element limit. */
1504 gdb::optional
<int> m_old_value
;
1507 #endif /* !defined (VALUE_H) */