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
147 explicit value (struct type
*type_
)
153 m_in_history (false),
155 m_enclosing_type (type_
)
161 DISABLE_COPY_AND_ASSIGN (value
);
163 /* Type of the value. */
164 struct type
*type () const
167 /* This is being used to change the type of an existing value, that
168 code should instead be creating a new value with the changed type
169 (but possibly shared content). */
170 void deprecated_set_type (struct type
*type
)
173 /* Return the gdbarch associated with the value. */
174 struct gdbarch
*arch () const;
176 /* Only used for bitfields; number of bits contained in them. */
177 LONGEST
bitsize () const
178 { return m_bitsize
; }
180 void set_bitsize (LONGEST bit
)
183 /* Only used for bitfields; position of start of field. For
184 little-endian targets, it is the position of the LSB. For
185 big-endian targets, it is the position of the MSB. */
186 LONGEST
bitpos () const
189 void set_bitpos (LONGEST bit
)
192 /* Only used for bitfields; the containing value. This allows a
193 single read from the target when displaying multiple
195 value
*parent () const
196 { return m_parent
.get (); }
198 void set_parent (struct value
*parent
)
199 { m_parent
= value_ref_ptr::new_reference (parent
); }
201 /* Describes offset of a value within lval of a structure in bytes.
202 If lval == lval_memory, this is an offset to the address. If
203 lval == lval_register, this is a further offset from
204 location.address within the registers structure. Note also the
205 member embedded_offset below. */
206 LONGEST
offset () const
209 void set_offset (LONGEST offset
)
210 { m_offset
= offset
; }
212 /* The comment from "struct value" reads: ``Is it modifiable? Only
213 relevant if lval != not_lval.''. Shouldn't the value instead be
214 not_lval and be done with it? */
215 int deprecated_modifiable () const
216 { return m_modifiable
; }
218 LONGEST
pointed_to_offset () const
219 { return m_pointed_to_offset
; }
221 void set_pointed_to_offset (LONGEST val
)
222 { m_pointed_to_offset
= val
; }
224 LONGEST
embedded_offset () const
225 { return m_embedded_offset
; }
227 void set_embedded_offset (LONGEST val
)
228 { m_embedded_offset
= val
; }
230 /* If zero, contents of this value are in the contents field. If
231 nonzero, contents are in inferior. If the lval field is lval_memory,
232 the contents are in inferior memory at location.address plus offset.
233 The lval field may also be lval_register.
235 WARNING: This field is used by the code which handles watchpoints
236 (see breakpoint.c) to decide whether a particular value can be
237 watched by hardware watchpoints. If the lazy flag is set for some
238 member of a value chain, it is assumed that this member of the
239 chain doesn't need to be watched as part of watching the value
240 itself. This is how GDB avoids watching the entire struct or array
241 when the user wants to watch a single struct member or array
242 element. If you ever change the way lazy flag is set and reset, be
243 sure to consider this use as well! */
248 void set_lazy (int val
)
252 /* If a value represents a C++ object, then the `type' field gives the
253 object's compile-time type. If the object actually belongs to some
254 class derived from `type', perhaps with other base classes and
255 additional members, then `type' is just a subobject of the real
256 thing, and the full object is probably larger than `type' would
259 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
260 actually determine the object's run-time type by looking at the
261 run-time type information in the vtable. When this information is
262 available, we may elect to read in the entire object, for several
265 - When printing the value, the user would probably rather see the
266 full object, not just the limited portion apparent from the
269 - If `type' has virtual base classes, then even printing `type'
270 alone may require reaching outside the `type' portion of the
271 object to wherever the virtual base class has been stored.
273 When we store the entire object, `enclosing_type' is the run-time
274 type -- the complete object -- and `embedded_offset' is the offset
275 of `type' within that larger type, in bytes. The value_contents()
276 macro takes `embedded_offset' into account, so most GDB code
277 continues to see the `type' portion of the value, just as the
280 If `type' is a pointer to an object, then `enclosing_type' is a
281 pointer to the object's run-time type, and `pointed_to_offset' is
282 the offset in bytes from the full object to the pointed-to object
283 -- that is, the value `embedded_offset' would have if we followed
284 the pointer and fetched the complete object. (I don't really see
285 the point. Why not just determine the run-time type when you
286 indirect, and avoid the special case? The contents don't matter
287 until you indirect anyway.)
289 If we're not doing anything fancy, `enclosing_type' is equal to
290 `type', and `embedded_offset' is zero, so everything works
293 struct type
*enclosing_type () const
294 { return m_enclosing_type
; }
296 void set_enclosing_type (struct type
*new_type
);
301 void set_stack (int val
)
304 /* If this value is lval_computed, return its lval_funcs
306 const struct lval_funcs
*computed_funcs () const;
308 /* If this value is lval_computed, return its closure. The meaning
309 of the returned value depends on the functions this value
311 void *computed_closure () const;
314 /* Type of value; either not an lval, or one of the various
315 different possible kinds of lval. */
316 enum lval_type m_lval
= not_lval
;
318 /* Is it modifiable? Only relevant if lval != not_lval. */
319 unsigned int m_modifiable
: 1;
321 /* If zero, contents of this value are in the contents field. If
322 nonzero, contents are in inferior. If the lval field is lval_memory,
323 the contents are in inferior memory at location.address plus offset.
324 The lval field may also be lval_register.
326 WARNING: This field is used by the code which handles watchpoints
327 (see breakpoint.c) to decide whether a particular value can be
328 watched by hardware watchpoints. If the lazy flag is set for
329 some member of a value chain, it is assumed that this member of
330 the chain doesn't need to be watched as part of watching the
331 value itself. This is how GDB avoids watching the entire struct
332 or array when the user wants to watch a single struct member or
333 array element. If you ever change the way lazy flag is set and
334 reset, be sure to consider this use as well! */
335 unsigned int m_lazy
: 1;
337 /* If value is a variable, is it initialized or not. */
338 unsigned int m_initialized
: 1;
340 /* If value is from the stack. If this is set, read_stack will be
341 used instead of read_memory to enable extra caching. */
342 unsigned int m_stack
: 1;
344 /* True if this is a zero value, created by 'value_zero'; false
348 /* True if this a value recorded in value history; false otherwise. */
349 bool m_in_history
: 1;
351 /* Location of value (if lval). */
354 /* If lval == lval_memory, this is the address in the inferior */
357 /*If lval == lval_register, the value is from a register. */
360 /* Register number. */
362 /* Frame ID of "next" frame to which a register value is relative.
363 If the register value is found relative to frame F, then the
364 frame id of F->next will be stored in next_frame_id. */
365 struct frame_id next_frame_id
;
368 /* Pointer to internal variable. */
369 struct internalvar
*internalvar
;
371 /* Pointer to xmethod worker. */
372 struct xmethod_worker
*xm_worker
;
374 /* If lval == lval_computed, this is a set of function pointers
375 to use to access and describe the value, and a closure pointer
379 /* Functions to call. */
380 const struct lval_funcs
*funcs
;
382 /* Closure for those functions to use. */
387 /* Describes offset of a value within lval of a structure in target
388 addressable memory units. Note also the member embedded_offset
390 LONGEST m_offset
= 0;
392 /* Only used for bitfields; number of bits contained in them. */
393 LONGEST m_bitsize
= 0;
395 /* Only used for bitfields; position of start of field. For
396 little-endian targets, it is the position of the LSB. For
397 big-endian targets, it is the position of the MSB. */
398 LONGEST m_bitpos
= 0;
400 /* The number of references to this value. When a value is created,
401 the value chain holds a reference, so REFERENCE_COUNT is 1. If
402 release_value is called, this value is removed from the chain but
403 the caller of release_value now has a reference to this value.
404 The caller must arrange for a call to value_free later. */
405 int m_reference_count
= 1;
407 /* Only used for bitfields; the containing value. This allows a
408 single read from the target when displaying multiple
410 value_ref_ptr m_parent
;
412 /* Type of the value. */
415 /* If a value represents a C++ object, then the `type' field gives
416 the object's compile-time type. If the object actually belongs
417 to some class derived from `type', perhaps with other base
418 classes and additional members, then `type' is just a subobject
419 of the real thing, and the full object is probably larger than
420 `type' would suggest.
422 If `type' is a dynamic class (i.e. one with a vtable), then GDB
423 can actually determine the object's run-time type by looking at
424 the run-time type information in the vtable. When this
425 information is available, we may elect to read in the entire
426 object, for several reasons:
428 - When printing the value, the user would probably rather see the
429 full object, not just the limited portion apparent from the
432 - If `type' has virtual base classes, then even printing `type'
433 alone may require reaching outside the `type' portion of the
434 object to wherever the virtual base class has been stored.
436 When we store the entire object, `enclosing_type' is the run-time
437 type -- the complete object -- and `embedded_offset' is the
438 offset of `type' within that larger type, in target addressable memory
439 units. The value_contents() macro takes `embedded_offset' into account,
440 so most GDB code continues to see the `type' portion of the value, just
441 as the inferior would.
443 If `type' is a pointer to an object, then `enclosing_type' is a
444 pointer to the object's run-time type, and `pointed_to_offset' is
445 the offset in target addressable memory units from the full object
446 to the pointed-to object -- that is, the value `embedded_offset' would
447 have if we followed the pointer and fetched the complete object.
448 (I don't really see the point. Why not just determine the
449 run-time type when you indirect, and avoid the special case? The
450 contents don't matter until you indirect anyway.)
452 If we're not doing anything fancy, `enclosing_type' is equal to
453 `type', and `embedded_offset' is zero, so everything works
455 struct type
*m_enclosing_type
;
456 LONGEST m_embedded_offset
= 0;
457 LONGEST m_pointed_to_offset
= 0;
459 /* Actual contents of the value. Target byte-order.
461 May be nullptr if the value is lazy or is entirely optimized out.
462 Guaranteed to be non-nullptr otherwise. */
463 gdb::unique_xmalloc_ptr
<gdb_byte
> m_contents
;
465 /* Unavailable ranges in CONTENTS. We mark unavailable ranges,
466 rather than available, since the common and default case is for a
467 value to be available. This is filled in at value read time.
468 The unavailable ranges are tracked in bits. Note that a contents
469 bit that has been optimized out doesn't really exist in the
470 program, so it can't be marked unavailable either. */
471 std::vector
<range
> m_unavailable
;
473 /* Likewise, but for optimized out contents (a chunk of the value of
474 a variable that does not actually exist in the program). If LVAL
475 is lval_register, this is a register ($pc, $sp, etc., never a
476 program variable) that has not been saved in the frame. Not
477 saved registers and optimized-out program variables values are
478 treated pretty much the same, except not-saved registers have a
479 different string representation and related error strings. */
480 std::vector
<range
> m_optimized_out
;
482 /* This is only non-zero for values of TYPE_CODE_ARRAY and if the size of
483 the array in inferior memory is greater than max_value_size. If these
484 conditions are met then, when the value is loaded from the inferior
485 GDB will only load a portion of the array into memory, and
486 limited_length will be set to indicate the length in octets that were
487 loaded from the inferior. */
488 ULONGEST m_limited_length
= 0;
491 /* Returns value_type or value_enclosing_type depending on
492 value_print_options.objectprint.
494 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
495 only for pointers and references, else it will be returned
496 for all the types (e.g. structures). This option is useful
497 to prevent retrieving enclosing type for the base classes fields.
499 REAL_TYPE_FOUND is used to inform whether the real type was found
500 (or just static type was used). The NULL may be passed if it is not
503 extern struct type
*value_actual_type (struct value
*value
,
504 int resolve_simple_types
,
505 int *real_type_found
);
507 /* For lval_computed values, this structure holds functions used to
508 retrieve and set the value (or portions of the value).
510 For each function, 'V' is the 'this' pointer: an lval_funcs
511 function F may always assume that the V it receives is an
512 lval_computed value, and has F in the appropriate slot of its
513 lval_funcs structure. */
517 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
518 a problem arises in obtaining VALUE's bits, this function should
519 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
520 non-optimized-out value is an internal error. */
521 void (*read
) (struct value
*v
);
523 /* Handle an assignment TOVAL = FROMVAL by writing the value of
524 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
525 been updated. If a problem arises in doing so, this function
526 should call 'error'. If it is NULL such TOVAL assignment is an error as
527 TOVAL is not considered as an lvalue. */
528 void (*write
) (struct value
*toval
, struct value
*fromval
);
530 /* Return true if any part of V is optimized out, false otherwise.
531 This will only be called for lazy values -- if the value has been
532 fetched, then the value's optimized-out bits are consulted
534 bool (*is_optimized_out
) (struct value
*v
);
536 /* If non-NULL, this is used to implement pointer indirection for
537 this value. This method may return NULL, in which case value_ind
538 will fall back to ordinary indirection. */
539 struct value
*(*indirect
) (struct value
*value
);
541 /* If non-NULL, this is used to implement reference resolving for
542 this value. This method may return NULL, in which case coerce_ref
543 will fall back to ordinary references resolving. */
544 struct value
*(*coerce_ref
) (const struct value
*value
);
546 /* If non-NULL, this is used to determine whether the indicated bits
547 of VALUE are a synthetic pointer. */
548 int (*check_synthetic_pointer
) (const struct value
*value
,
549 LONGEST offset
, int length
);
551 /* Return a duplicate of VALUE's closure, for use in a new value.
552 This may simply return the same closure, if VALUE's is
553 reference-counted or statically allocated.
555 This may be NULL, in which case VALUE's closure is re-used in the
557 void *(*copy_closure
) (const struct value
*v
);
559 /* Drop VALUE's reference to its closure. Maybe this frees the
560 closure; maybe this decrements a reference count; maybe the
561 closure is statically allocated and this does nothing.
563 This may be NULL, in which case no action is taken to free
565 void (*free_closure
) (struct value
*v
);
568 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
569 and closure CLOSURE. */
571 extern struct value
*allocate_computed_value (struct type
*type
,
572 const struct lval_funcs
*funcs
,
575 extern struct value
*allocate_optimized_out_value (struct type
*type
);
577 /* Throw an error complaining that the value has been optimized
580 extern void error_value_optimized_out (void);
582 /* value_contents() and value_contents_raw() both return the address
583 of the gdb buffer used to hold a copy of the contents of the lval.
584 value_contents() is used when the contents of the buffer are needed
585 -- it uses value_fetch_lazy() to load the buffer from the process
586 being debugged if it hasn't already been loaded
587 (value_contents_writeable() is used when a writeable but fetched
588 buffer is required).. value_contents_raw() is used when data is
589 being stored into the buffer, or when it is certain that the
590 contents of the buffer are valid.
592 Note: The contents pointer is adjusted by the offset required to
593 get to the real subobject, if the value happens to represent
594 something embedded in a larger run-time object. */
596 extern gdb::array_view
<gdb_byte
> value_contents_raw (struct value
*);
598 /* Actual contents of the value. For use of this value; setting it
599 uses the stuff above. Not valid if lazy is nonzero. Target
600 byte-order. We force it to be aligned properly for any possible
601 value. Note that a value therefore extends beyond what is
604 extern gdb::array_view
<const gdb_byte
> value_contents (struct value
*);
605 extern gdb::array_view
<gdb_byte
> value_contents_writeable (struct value
*);
607 /* The ALL variants of the above two macros do not adjust the returned
608 pointer by the embedded_offset value. */
610 extern gdb::array_view
<gdb_byte
> value_contents_all_raw (struct value
*);
611 extern gdb::array_view
<const gdb_byte
> value_contents_all (struct value
*);
613 /* Like value_contents_all, but does not require that the returned
614 bits be valid. This should only be used in situations where you
615 plan to check the validity manually. */
616 extern gdb::array_view
<const gdb_byte
> value_contents_for_printing (struct value
*value
);
618 /* Like value_contents_for_printing, but accepts a constant value
619 pointer. Unlike value_contents_for_printing however, the pointed
620 value must _not_ be lazy. */
621 extern gdb::array_view
<const gdb_byte
>
622 value_contents_for_printing_const (const struct value
*value
);
624 extern void value_fetch_lazy (struct value
*val
);
626 /* If nonzero, this is the value of a variable which does not actually
627 exist in the program, at least partially. If the value is lazy,
628 this may fetch it now. */
629 extern int value_optimized_out (struct value
*value
);
631 /* Given a value, return true if any of the contents bits starting at
632 OFFSET and extending for LENGTH bits is optimized out, false
635 extern int value_bits_any_optimized_out (const struct value
*value
,
636 int bit_offset
, int bit_length
);
638 /* Like value_optimized_out, but return true iff the whole value is
640 extern int value_entirely_optimized_out (struct value
*value
);
642 /* Mark VALUE's content bytes starting at OFFSET and extending for
643 LENGTH bytes as optimized out. */
645 extern void mark_value_bytes_optimized_out (struct value
*value
,
646 int offset
, int length
);
648 /* Mark VALUE's content bits starting at OFFSET and extending for
649 LENGTH bits as optimized out. */
651 extern void mark_value_bits_optimized_out (struct value
*value
,
652 LONGEST offset
, LONGEST length
);
654 /* Set or return field indicating whether a variable is initialized or
655 not, based on debugging information supplied by the compiler.
656 1 = initialized; 0 = uninitialized. */
657 extern int value_initialized (const struct value
*);
658 extern void set_value_initialized (struct value
*, int);
660 /* Set COMPONENT's location as appropriate for a component of WHOLE
661 --- regardless of what kind of lvalue WHOLE is. */
662 extern void set_value_component_location (struct value
*component
,
663 const struct value
*whole
);
665 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
666 single value might have multiple LVALs), this hacked interface is
667 limited to just the first PIECE. Expect further change. */
668 /* Type of value; either not an lval, or one of the various different
669 possible kinds of lval. */
670 extern enum lval_type
*deprecated_value_lval_hack (struct value
*);
671 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
673 /* Like VALUE_LVAL, except the parameter can be const. */
674 extern enum lval_type
value_lval_const (const struct value
*value
);
676 /* If lval == lval_memory, return the address in the inferior. If
677 lval == lval_register, return the byte offset into the registers
678 structure. Otherwise, return 0. The returned address
679 includes the offset, if any. */
680 extern CORE_ADDR
value_address (const struct value
*);
682 /* Like value_address, except the result does not include value's
684 extern CORE_ADDR
value_raw_address (const struct value
*);
686 /* Set the address of a value. */
687 extern void set_value_address (struct value
*, CORE_ADDR
);
689 /* Pointer to internal variable. */
690 extern struct internalvar
**deprecated_value_internalvar_hack (struct value
*);
691 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
693 /* Frame ID of "next" frame to which a register value is relative. A
694 register value is indicated by VALUE_LVAL being set to lval_register.
695 So, if the register value is found relative to frame F, then the
696 frame id of F->next will be stored in VALUE_NEXT_FRAME_ID. */
697 extern struct frame_id
*deprecated_value_next_frame_id_hack (struct value
*);
698 #define VALUE_NEXT_FRAME_ID(val) (*deprecated_value_next_frame_id_hack (val))
700 /* Register number if the value is from a register. */
701 extern int *deprecated_value_regnum_hack (struct value
*);
702 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
704 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
705 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
707 extern struct value
*coerce_ref_if_computed (const struct value
*arg
);
709 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
710 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
711 ORIGINAL_VAL are the type and value of the original reference or
712 pointer. ORIGINAL_VALUE_ADDRESS is the address within VALUE, that is
713 the address that was dereferenced.
715 Note, that VALUE is modified by this function.
717 It is a common implementation for coerce_ref and value_ind. */
719 extern struct value
* readjust_indirect_value_type (struct value
*value
,
720 struct type
*enc_type
,
721 const struct type
*original_type
,
722 struct value
*original_val
,
723 CORE_ADDR original_value_address
);
725 /* Convert a REF to the object referenced. */
727 extern struct value
*coerce_ref (struct value
*value
);
729 /* If ARG is an array, convert it to a pointer.
730 If ARG is a function, convert it to a function pointer.
732 References are dereferenced. */
734 extern struct value
*coerce_array (struct value
*value
);
736 /* Given a value, determine whether the bits starting at OFFSET and
737 extending for LENGTH bits are a synthetic pointer. */
739 extern int value_bits_synthetic_pointer (const struct value
*value
,
740 LONGEST offset
, LONGEST length
);
742 /* Given a value, determine whether the contents bytes starting at
743 OFFSET and extending for LENGTH bytes are available. This returns
744 nonzero if all bytes in the given range are available, zero if any
745 byte is unavailable. */
747 extern int value_bytes_available (const struct value
*value
,
748 LONGEST offset
, ULONGEST length
);
750 /* Given a value, determine whether the contents bits starting at
751 OFFSET and extending for LENGTH bits are available. This returns
752 nonzero if all bits in the given range are available, zero if any
753 bit is unavailable. */
755 extern int value_bits_available (const struct value
*value
,
756 LONGEST offset
, ULONGEST length
);
758 /* Like value_bytes_available, but return false if any byte in the
759 whole object is unavailable. */
760 extern int value_entirely_available (struct value
*value
);
762 /* Like value_entirely_available, but return false if any byte in the
763 whole object is available. */
764 extern int value_entirely_unavailable (struct value
*value
);
766 /* Mark VALUE's content bytes starting at OFFSET and extending for
767 LENGTH bytes as unavailable. */
769 extern void mark_value_bytes_unavailable (struct value
*value
,
770 LONGEST offset
, ULONGEST length
);
772 /* Mark VALUE's content bits starting at OFFSET and extending for
773 LENGTH bits as unavailable. */
775 extern void mark_value_bits_unavailable (struct value
*value
,
776 LONGEST offset
, ULONGEST length
);
778 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
779 LENGTH bytes of VAL2's contents starting at OFFSET2.
781 Note that "contents" refers to the whole value's contents
782 (value_contents_all), without any embedded offset adjustment. For
783 example, to compare a complete object value with itself, including
784 its enclosing type chunk, you'd do:
786 int len = check_typedef (val->enclosing_type ())->length ();
787 value_contents_eq (val, 0, val, 0, len);
789 Returns true iff the set of available/valid contents match.
791 Optimized-out contents are equal to optimized-out contents, and are
792 not equal to non-optimized-out contents.
794 Unavailable contents are equal to unavailable contents, and are not
795 equal to non-unavailable contents.
797 For example, if 'x's represent an unavailable byte, and 'V' and 'Z'
798 represent different available/valid bytes, in a value with length
802 contents: xxxxVVVVxxxxVVZZ
806 value_contents_eq(val, 0, val, 8, 6) => true
807 value_contents_eq(val, 0, val, 4, 4) => false
808 value_contents_eq(val, 0, val, 8, 8) => false
809 value_contents_eq(val, 4, val, 12, 2) => true
810 value_contents_eq(val, 4, val, 12, 4) => true
811 value_contents_eq(val, 3, val, 4, 4) => true
813 If 'x's represent an unavailable byte, 'o' represents an optimized
814 out byte, in a value with length 8:
821 value_contents_eq(val, 0, val, 2, 2) => true
822 value_contents_eq(val, 4, val, 6, 2) => true
823 value_contents_eq(val, 0, val, 4, 4) => true
825 We only know whether a value chunk is unavailable or optimized out
826 if we've tried to read it. As this routine is used by printing
827 routines, which may be printing values in the value history, long
828 after the inferior is gone, it works with const values. Therefore,
829 this routine must not be called with lazy values. */
831 extern bool value_contents_eq (const struct value
*val1
, LONGEST offset1
,
832 const struct value
*val2
, LONGEST offset2
,
835 /* An overload of value_contents_eq that compares the entirety of both
838 extern bool value_contents_eq (const struct value
*val1
,
839 const struct value
*val2
);
841 /* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
842 which is (or will be copied to) VAL's contents buffer offset by
843 BIT_OFFSET bits. Marks value contents ranges as unavailable if
844 the corresponding memory is likewise unavailable. STACK indicates
845 whether the memory is known to be stack memory. */
847 extern void read_value_memory (struct value
*val
, LONGEST bit_offset
,
848 int stack
, CORE_ADDR memaddr
,
849 gdb_byte
*buffer
, size_t length
);
851 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
852 into each element of a new vector value with VECTOR_TYPE. */
854 struct value
*value_vector_widen (struct value
*scalar_value
,
855 struct type
*vector_type
);
860 #include "gdbtypes.h"
861 #include "expression.h"
863 class frame_info_ptr
;
866 extern int print_address_demangle (const struct value_print_options
*,
867 struct gdbarch
*, CORE_ADDR
,
868 struct ui_file
*, int);
870 /* Returns true if VAL is of floating-point type. In addition,
871 throws an error if the value is an invalid floating-point value. */
872 extern bool is_floating_value (struct value
*val
);
874 extern LONGEST
value_as_long (struct value
*val
);
875 extern CORE_ADDR
value_as_address (struct value
*val
);
877 extern LONGEST
unpack_long (struct type
*type
, const gdb_byte
*valaddr
);
878 extern CORE_ADDR
unpack_pointer (struct type
*type
, const gdb_byte
*valaddr
);
880 extern LONGEST
unpack_field_as_long (struct type
*type
,
881 const gdb_byte
*valaddr
,
884 /* Unpack a bitfield of the specified FIELD_TYPE, from the object at
885 VALADDR, and store the result in *RESULT.
886 The bitfield starts at BITPOS bits and contains BITSIZE bits; if
887 BITSIZE is zero, then the length is taken from FIELD_TYPE.
889 Extracting bits depends on endianness of the machine. Compute the
890 number of least significant bits to discard. For big endian machines,
891 we compute the total number of bits in the anonymous object, subtract
892 off the bit count from the MSB of the object to the MSB of the
893 bitfield, then the size of the bitfield, which leaves the LSB discard
894 count. For little endian machines, the discard count is simply the
895 number of bits from the LSB of the anonymous object to the LSB of the
898 If the field is signed, we also do sign extension. */
900 extern LONGEST
unpack_bits_as_long (struct type
*field_type
,
901 const gdb_byte
*valaddr
,
902 LONGEST bitpos
, LONGEST bitsize
);
904 extern int unpack_value_field_as_long (struct type
*type
, const gdb_byte
*valaddr
,
905 LONGEST embedded_offset
, int fieldno
,
906 const struct value
*val
, LONGEST
*result
);
908 extern void unpack_value_bitfield (struct value
*dest_val
,
909 LONGEST bitpos
, LONGEST bitsize
,
910 const gdb_byte
*valaddr
,
911 LONGEST embedded_offset
,
912 const struct value
*val
);
914 extern struct value
*value_field_bitfield (struct type
*type
, int fieldno
,
915 const gdb_byte
*valaddr
,
916 LONGEST embedded_offset
,
917 const struct value
*val
);
919 extern void pack_long (gdb_byte
*buf
, struct type
*type
, LONGEST num
);
921 extern struct value
*value_from_longest (struct type
*type
, LONGEST num
);
922 extern struct value
*value_from_ulongest (struct type
*type
, ULONGEST num
);
923 extern struct value
*value_from_pointer (struct type
*type
, CORE_ADDR addr
);
924 extern struct value
*value_from_host_double (struct type
*type
, double d
);
925 extern struct value
*value_from_history_ref (const char *, const char **);
926 extern struct value
*value_from_component (struct value
*, struct type
*,
930 /* Create a new value by extracting it from WHOLE. TYPE is the type
931 of the new value. BIT_OFFSET and BIT_LENGTH describe the offset
932 and field width of the value to extract from WHOLE -- BIT_LENGTH
933 may differ from TYPE's length in the case where WHOLE's type is
936 When the value does come from a non-byte-aligned offset or field
937 width, it will be marked non_lval. */
939 extern struct value
*value_from_component_bitsize (struct value
*whole
,
944 extern struct value
*value_at (struct type
*type
, CORE_ADDR addr
);
945 extern struct value
*value_at_lazy (struct type
*type
, CORE_ADDR addr
);
947 /* Like value_at, but ensures that the result is marked not_lval.
948 This can be important if the memory is "volatile". */
949 extern struct value
*value_at_non_lval (struct type
*type
, CORE_ADDR addr
);
951 extern struct value
*value_from_contents_and_address_unresolved
952 (struct type
*, const gdb_byte
*, CORE_ADDR
);
953 extern struct value
*value_from_contents_and_address (struct type
*,
956 extern struct value
*value_from_contents (struct type
*, const gdb_byte
*);
958 extern struct value
*default_value_from_register (struct gdbarch
*gdbarch
,
961 struct frame_id frame_id
);
963 extern void read_frame_register_value (struct value
*value
,
964 frame_info_ptr frame
);
966 extern struct value
*value_from_register (struct type
*type
, int regnum
,
967 frame_info_ptr frame
);
969 extern CORE_ADDR
address_from_register (int regnum
,
970 frame_info_ptr frame
);
972 extern struct value
*value_of_variable (struct symbol
*var
,
973 const struct block
*b
);
975 extern struct value
*address_of_variable (struct symbol
*var
,
976 const struct block
*b
);
978 extern struct value
*value_of_register (int regnum
, frame_info_ptr frame
);
980 struct value
*value_of_register_lazy (frame_info_ptr frame
, int regnum
);
982 /* Return the symbol's reading requirement. */
984 extern enum symbol_needs_kind
symbol_read_needs (struct symbol
*);
986 /* Return true if the symbol needs a frame. This is a wrapper for
987 symbol_read_needs that simply checks for SYMBOL_NEEDS_FRAME. */
989 extern int symbol_read_needs_frame (struct symbol
*);
991 extern struct value
*read_var_value (struct symbol
*var
,
992 const struct block
*var_block
,
993 frame_info_ptr frame
);
995 extern struct value
*allocate_value (struct type
*type
);
996 extern struct value
*allocate_value_lazy (struct type
*type
);
997 extern void value_contents_copy (struct value
*dst
, LONGEST dst_offset
,
998 struct value
*src
, LONGEST src_offset
,
1001 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
1003 extern struct value
*value_mark (void);
1005 extern void value_free_to_mark (const struct value
*mark
);
1007 /* A helper class that uses value_mark at construction time and calls
1008 value_free_to_mark in the destructor. This is used to clear out
1009 temporary values created during the lifetime of this object. */
1010 class scoped_value_mark
1014 scoped_value_mark ()
1015 : m_value (value_mark ())
1019 ~scoped_value_mark ()
1024 scoped_value_mark (scoped_value_mark
&&other
) = default;
1026 DISABLE_COPY_AND_ASSIGN (scoped_value_mark
);
1028 /* Free the values currently on the value stack. */
1029 void free_to_mark ()
1031 if (m_value
!= NULL
)
1033 value_free_to_mark (m_value
);
1040 const struct value
*m_value
;
1043 extern struct value
*value_cstring (const char *ptr
, ssize_t len
,
1044 struct type
*char_type
);
1045 extern struct value
*value_string (const char *ptr
, ssize_t len
,
1046 struct type
*char_type
);
1048 extern struct value
*value_array (int lowbound
, int highbound
,
1049 struct value
**elemvec
);
1051 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
1053 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
1054 enum exp_opcode op
);
1056 extern struct value
*value_ptradd (struct value
*arg1
, LONGEST arg2
);
1058 extern LONGEST
value_ptrdiff (struct value
*arg1
, struct value
*arg2
);
1060 /* Return true if VAL does not live in target memory, but should in order
1061 to operate on it. Otherwise return false. */
1063 extern bool value_must_coerce_to_target (struct value
*arg1
);
1065 extern struct value
*value_coerce_to_target (struct value
*arg1
);
1067 extern struct value
*value_coerce_array (struct value
*arg1
);
1069 extern struct value
*value_coerce_function (struct value
*arg1
);
1071 extern struct value
*value_ind (struct value
*arg1
);
1073 extern struct value
*value_addr (struct value
*arg1
);
1075 extern struct value
*value_ref (struct value
*arg1
, enum type_code refcode
);
1077 extern struct value
*value_assign (struct value
*toval
,
1078 struct value
*fromval
);
1080 extern struct value
*value_pos (struct value
*arg1
);
1082 extern struct value
*value_neg (struct value
*arg1
);
1084 extern struct value
*value_complement (struct value
*arg1
);
1086 extern struct value
*value_struct_elt (struct value
**argp
,
1087 gdb::optional
<gdb::array_view
<value
*>> args
,
1088 const char *name
, int *static_memfuncp
,
1091 extern struct value
*value_struct_elt_bitpos (struct value
**argp
,
1093 struct type
*field_type
,
1096 extern struct value
*value_aggregate_elt (struct type
*curtype
,
1098 struct type
*expect_type
,
1100 enum noside noside
);
1102 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
1104 enum oload_search_type
{ NON_METHOD
, METHOD
, BOTH
};
1106 extern int find_overload_match (gdb::array_view
<value
*> args
,
1108 enum oload_search_type method
,
1109 struct value
**objp
, struct symbol
*fsym
,
1110 struct value
**valp
, struct symbol
**symp
,
1111 int *staticp
, const int no_adl
,
1112 enum noside noside
);
1114 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
1116 extern struct value
*value_primitive_field (struct value
*arg1
, LONGEST offset
,
1118 struct type
*arg_type
);
1121 extern struct type
*value_rtti_indirect_type (struct value
*, int *, LONGEST
*,
1124 extern struct value
*value_full_object (struct value
*, struct type
*, int,
1127 extern struct value
*value_cast_pointers (struct type
*, struct value
*, int);
1129 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
1131 extern struct value
*value_reinterpret_cast (struct type
*type
,
1134 extern struct value
*value_dynamic_cast (struct type
*type
, struct value
*arg
);
1136 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
1138 extern struct value
*value_one (struct type
*type
);
1140 extern struct value
*value_repeat (struct value
*arg1
, int count
);
1142 extern struct value
*value_subscript (struct value
*array
, LONGEST index
);
1144 extern struct value
*value_bitstring_subscript (struct type
*type
,
1145 struct value
*bitstring
,
1148 extern struct value
*register_value_being_returned (struct type
*valtype
,
1149 struct regcache
*retbuf
);
1151 extern int value_in (struct value
*element
, struct value
*set
);
1153 extern int value_bit_index (struct type
*type
, const gdb_byte
*addr
,
1156 extern enum return_value_convention
1157 struct_return_convention (struct gdbarch
*gdbarch
, struct value
*function
,
1158 struct type
*value_type
);
1160 extern int using_struct_return (struct gdbarch
*gdbarch
,
1161 struct value
*function
,
1162 struct type
*value_type
);
1164 /* Evaluate the expression EXP. If set, EXPECT_TYPE is passed to the
1165 outermost operation's evaluation. This is ignored by most
1166 operations, but may be used, e.g., to determine the type of an
1167 otherwise untyped symbol. The caller should not assume that the
1168 returned value has this type. */
1170 extern struct value
*evaluate_expression (struct expression
*exp
,
1171 struct type
*expect_type
= nullptr);
1173 extern struct value
*evaluate_type (struct expression
*exp
);
1175 extern value
*evaluate_var_value (enum noside noside
, const block
*blk
,
1178 extern value
*evaluate_var_msym_value (enum noside noside
,
1179 struct objfile
*objfile
,
1180 minimal_symbol
*msymbol
);
1182 namespace expr
{ class operation
; };
1183 extern void fetch_subexp_value (struct expression
*exp
,
1184 expr::operation
*op
,
1185 struct value
**valp
, struct value
**resultp
,
1186 std::vector
<value_ref_ptr
> *val_chain
,
1187 bool preserve_errors
);
1189 extern struct value
*parse_and_eval (const char *exp
);
1191 extern struct value
*parse_to_comma_and_eval (const char **expp
);
1193 extern struct type
*parse_and_eval_type (const char *p
, int length
);
1195 extern CORE_ADDR
parse_and_eval_address (const char *exp
);
1197 extern LONGEST
parse_and_eval_long (const char *exp
);
1199 extern void unop_promote (const struct language_defn
*language
,
1200 struct gdbarch
*gdbarch
,
1201 struct value
**arg1
);
1203 extern void binop_promote (const struct language_defn
*language
,
1204 struct gdbarch
*gdbarch
,
1205 struct value
**arg1
, struct value
**arg2
);
1207 extern struct value
*access_value_history (int num
);
1209 /* Return the number of items in the value history. */
1211 extern ULONGEST
value_history_count ();
1213 extern struct value
*value_of_internalvar (struct gdbarch
*gdbarch
,
1214 struct internalvar
*var
);
1216 extern int get_internalvar_integer (struct internalvar
*var
, LONGEST
*l
);
1218 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
1220 extern void set_internalvar_integer (struct internalvar
*var
, LONGEST l
);
1222 extern void set_internalvar_string (struct internalvar
*var
,
1223 const char *string
);
1225 extern void clear_internalvar (struct internalvar
*var
);
1227 extern void set_internalvar_component (struct internalvar
*var
,
1229 LONGEST bitpos
, LONGEST bitsize
,
1230 struct value
*newvalue
);
1232 extern struct internalvar
*lookup_only_internalvar (const char *name
);
1234 extern struct internalvar
*create_internalvar (const char *name
);
1236 extern void complete_internalvar (completion_tracker
&tracker
,
1239 /* An internalvar can be dynamically computed by supplying a vector of
1240 function pointers to perform various operations. */
1242 struct internalvar_funcs
1244 /* Compute the value of the variable. The DATA argument passed to
1245 the function is the same argument that was passed to
1246 `create_internalvar_type_lazy'. */
1248 struct value
*(*make_value
) (struct gdbarch
*arch
,
1249 struct internalvar
*var
,
1252 /* Update the agent expression EXPR with bytecode to compute the
1253 value. VALUE is the agent value we are updating. The DATA
1254 argument passed to this function is the same argument that was
1255 passed to `create_internalvar_type_lazy'. If this pointer is
1256 NULL, then the internalvar cannot be compiled to an agent
1259 void (*compile_to_ax
) (struct internalvar
*var
,
1260 struct agent_expr
*expr
,
1261 struct axs_value
*value
,
1265 extern struct internalvar
*create_internalvar_type_lazy (const char *name
,
1266 const struct internalvar_funcs
*funcs
,
1269 /* Compile an internal variable to an agent expression. VAR is the
1270 variable to compile; EXPR and VALUE are the agent expression we are
1271 updating. This will return 0 if there is no known way to compile
1272 VAR, and 1 if VAR was successfully compiled. It may also throw an
1273 exception on error. */
1275 extern int compile_internalvar_to_ax (struct internalvar
*var
,
1276 struct agent_expr
*expr
,
1277 struct axs_value
*value
);
1279 extern struct internalvar
*lookup_internalvar (const char *name
);
1281 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
1283 extern int value_equal_contents (struct value
*arg1
, struct value
*arg2
);
1285 extern int value_less (struct value
*arg1
, struct value
*arg2
);
1287 /* Simulate the C operator ! -- return true if ARG1 contains zero. */
1288 extern bool value_logical_not (struct value
*arg1
);
1290 /* Returns true if the value VAL represents a true value. */
1292 value_true (struct value
*val
)
1294 return !value_logical_not (val
);
1299 extern struct value
*value_of_this (const struct language_defn
*lang
);
1301 extern struct value
*value_of_this_silent (const struct language_defn
*lang
);
1303 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
1305 enum exp_opcode otherop
,
1306 enum noside noside
);
1308 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
1309 enum noside noside
);
1311 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
1312 int j
, struct type
*type
, LONGEST offset
);
1314 extern int binop_types_user_defined_p (enum exp_opcode op
,
1316 struct type
*type2
);
1318 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
1319 struct value
*arg2
);
1321 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
1323 extern int destructor_name_p (const char *name
, struct type
*type
);
1325 extern value_ref_ptr
release_value (struct value
*val
);
1327 extern int record_latest_value (struct value
*val
);
1329 extern void modify_field (struct type
*type
, gdb_byte
*addr
,
1330 LONGEST fieldval
, LONGEST bitpos
, LONGEST bitsize
);
1332 extern void type_print (struct type
*type
, const char *varstring
,
1333 struct ui_file
*stream
, int show
);
1335 extern std::string
type_to_string (struct type
*type
);
1337 extern gdb_byte
*baseclass_addr (struct type
*type
, int index
,
1339 struct value
**valuep
, int *errp
);
1341 extern void print_longest (struct ui_file
*stream
, int format
,
1342 int use_local
, LONGEST val
);
1344 extern void print_floating (const gdb_byte
*valaddr
, struct type
*type
,
1345 struct ui_file
*stream
);
1347 extern void value_print (struct value
*val
, struct ui_file
*stream
,
1348 const struct value_print_options
*options
);
1350 /* Release values from the value chain and return them. Values
1351 created after MARK are released. If MARK is nullptr, or if MARK is
1352 not found on the value chain, then all values are released. Values
1353 are returned in reverse order of creation; that is, newest
1356 extern std::vector
<value_ref_ptr
> value_release_to_mark
1357 (const struct value
*mark
);
1359 extern void common_val_print (struct value
*val
,
1360 struct ui_file
*stream
, int recurse
,
1361 const struct value_print_options
*options
,
1362 const struct language_defn
*language
);
1364 extern int val_print_string (struct type
*elttype
, const char *encoding
,
1365 CORE_ADDR addr
, int len
,
1366 struct ui_file
*stream
,
1367 const struct value_print_options
*options
);
1369 extern void print_variable_and_value (const char *name
,
1371 frame_info_ptr frame
,
1372 struct ui_file
*stream
,
1375 extern void typedef_print (struct type
*type
, struct symbol
*news
,
1376 struct ui_file
*stream
);
1378 extern const char *internalvar_name (const struct internalvar
*var
);
1380 extern void preserve_values (struct objfile
*);
1384 extern struct value
*value_copy (const value
*);
1386 extern struct value
*value_non_lval (struct value
*);
1388 extern void value_force_lval (struct value
*, CORE_ADDR
);
1390 extern struct value
*make_cv_value (int, int, struct value
*);
1392 extern void preserve_one_value (struct value
*, struct objfile
*, htab_t
);
1396 extern struct value
*varying_to_slice (struct value
*);
1398 extern struct value
*value_slice (struct value
*, int, int);
1400 /* Create a complex number. The type is the complex type; the values
1401 are cast to the underlying scalar type before the complex number is
1404 extern struct value
*value_literal_complex (struct value
*, struct value
*,
1407 /* Return the real part of a complex value. */
1409 extern struct value
*value_real_part (struct value
*value
);
1411 /* Return the imaginary part of a complex value. */
1413 extern struct value
*value_imaginary_part (struct value
*value
);
1415 extern struct value
*find_function_in_inferior (const char *,
1418 extern struct value
*value_allocate_space_in_inferior (int);
1420 /* User function handler. */
1422 typedef struct value
*(*internal_function_fn
) (struct gdbarch
*gdbarch
,
1423 const struct language_defn
*language
,
1426 struct value
**argv
);
1428 /* Add a new internal function. NAME is the name of the function; DOC
1429 is a documentation string describing the function. HANDLER is
1430 called when the function is invoked. COOKIE is an arbitrary
1431 pointer which is passed to HANDLER and is intended for "user
1434 extern void add_internal_function (const char *name
, const char *doc
,
1435 internal_function_fn handler
,
1438 /* This overload takes an allocated documentation string. */
1440 extern void add_internal_function (gdb::unique_xmalloc_ptr
<char> &&name
,
1441 gdb::unique_xmalloc_ptr
<char> &&doc
,
1442 internal_function_fn handler
,
1445 struct value
*call_internal_function (struct gdbarch
*gdbarch
,
1446 const struct language_defn
*language
,
1447 struct value
*function
,
1448 int argc
, struct value
**argv
);
1450 const char *value_internal_function_name (struct value
*);
1452 /* Build a value wrapping and representing WORKER. The value takes ownership
1453 of the xmethod_worker object. */
1455 extern struct value
*value_from_xmethod (xmethod_worker_up
&&worker
);
1457 extern struct type
*result_type_of_xmethod (struct value
*method
,
1458 gdb::array_view
<value
*> argv
);
1460 extern struct value
*call_xmethod (struct value
*method
,
1461 gdb::array_view
<value
*> argv
);
1463 /* Destroy the values currently allocated. This is called when GDB is
1464 exiting (e.g., on quit_force). */
1465 extern void finalize_values ();
1467 /* Convert VALUE to a gdb_mpq. The caller must ensure that VALUE is
1468 of floating-point, fixed-point, or integer type. */
1469 extern gdb_mpq
value_to_gdb_mpq (struct value
*value
);
1471 /* While an instance of this class is live, and array values that are
1472 created, that are larger than max_value_size, will be restricted in size
1473 to a particular number of elements. */
1475 struct scoped_array_length_limiting
1477 /* Limit any large array values to only contain ELEMENTS elements. */
1478 scoped_array_length_limiting (int elements
);
1480 /* Restore the previous array value limit. */
1481 ~scoped_array_length_limiting ();
1484 /* Used to hold the previous array value element limit. */
1485 gdb::optional
<int> m_old_value
;
1488 #endif /* !defined (VALUE_H) */