1 /* Definitions for values of C expressions, for GDB.
3 Copyright (C) 1986-2014 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)
24 #include "frame.h" /* For struct frame_id. */
33 struct value_print_options
;
34 struct xmethod_worker
;
36 /* Values can be partially 'optimized out' and/or 'unavailable'.
37 These are distinct states and have different string representations
38 and related error strings.
40 'unavailable' has a specific meaning in this context. It means the
41 value exists in the program (at the machine level), but GDB has no
42 means to get to it. Such a value is normally printed as
43 <unavailable>. Examples of how to end up with an unavailable value
46 - We're inspecting a traceframe, and the memory or registers the
47 debug information says the value lives on haven't been collected.
49 - We're inspecting a core dump, the memory or registers the debug
50 information says the value lives aren't present in the dump
51 (that is, we have a partial/trimmed core dump, or we don't fully
52 understand/handle the core dump's format).
54 - We're doing live debugging, but the debug API has no means to
55 get at where the value lives in the machine, like e.g., ptrace
56 not having access to some register or register set.
58 - Any other similar scenario.
60 OTOH, "optimized out" is about what the compiler decided to generate
61 (or not generate). A chunk of a value that was optimized out does
62 not actually exist in the program. There's no way to get at it
63 short of compiling the program differently.
65 A register that has not been saved in a frame is likewise considered
66 optimized out, except not-saved registers have a different string
67 representation and related error strings. E.g., we'll print them as
68 <not-saved> instead of <optimized out>, as in:
72 (gdb) info registers rax
75 If the debug info describes a variable as being in such a register,
76 we'll still print the variable as <optimized out>. IOW, <not saved>
77 is reserved for inspecting registers at the machine level.
79 When comparing value contents, optimized out chunks, unavailable
80 chunks, and valid contents data are all considered different. See
81 value_contents_eq for more info.
84 /* The structure which defines the type of a value. It should never
85 be possible for a program lval value to survive over a call to the
86 inferior (i.e. to be put into the history list or an internal
91 /* Values are stored in a chain, so that they can be deleted easily
92 over calls to the inferior. Values assigned to internal variables,
93 put into the value history or exposed to Python are taken off this
96 struct value
*value_next (struct value
*);
98 /* Type of the value. */
100 extern struct type
*value_type (const struct value
*);
102 /* This is being used to change the type of an existing value, that
103 code should instead be creating a new value with the changed type
104 (but possibly shared content). */
106 extern void deprecated_set_value_type (struct value
*value
,
109 /* Only used for bitfields; number of bits contained in them. */
111 extern int value_bitsize (const struct value
*);
112 extern void set_value_bitsize (struct value
*, int bit
);
114 /* Only used for bitfields; position of start of field. For
115 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
116 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
118 extern int value_bitpos (const struct value
*);
119 extern void set_value_bitpos (struct value
*, int bit
);
121 /* Only used for bitfields; the containing value. This allows a
122 single read from the target when displaying multiple
125 struct value
*value_parent (struct value
*);
126 extern void set_value_parent (struct value
*value
, struct value
*parent
);
128 /* Describes offset of a value within lval of a structure in bytes.
129 If lval == lval_memory, this is an offset to the address. If lval
130 == lval_register, this is a further offset from location.address
131 within the registers structure. Note also the member
132 embedded_offset below. */
134 extern int value_offset (const struct value
*);
135 extern void set_value_offset (struct value
*, int offset
);
137 /* The comment from "struct value" reads: ``Is it modifiable? Only
138 relevant if lval != not_lval.''. Shouldn't the value instead be
139 not_lval and be done with it? */
141 extern int deprecated_value_modifiable (struct value
*value
);
143 /* If a value represents a C++ object, then the `type' field gives the
144 object's compile-time type. If the object actually belongs to some
145 class derived from `type', perhaps with other base classes and
146 additional members, then `type' is just a subobject of the real
147 thing, and the full object is probably larger than `type' would
150 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
151 actually determine the object's run-time type by looking at the
152 run-time type information in the vtable. When this information is
153 available, we may elect to read in the entire object, for several
156 - When printing the value, the user would probably rather see the
157 full object, not just the limited portion apparent from the
160 - If `type' has virtual base classes, then even printing `type'
161 alone may require reaching outside the `type' portion of the
162 object to wherever the virtual base class has been stored.
164 When we store the entire object, `enclosing_type' is the run-time
165 type -- the complete object -- and `embedded_offset' is the offset
166 of `type' within that larger type, in bytes. The value_contents()
167 macro takes `embedded_offset' into account, so most GDB code
168 continues to see the `type' portion of the value, just as the
171 If `type' is a pointer to an object, then `enclosing_type' is a
172 pointer to the object's run-time type, and `pointed_to_offset' is
173 the offset in bytes from the full object to the pointed-to object
174 -- that is, the value `embedded_offset' would have if we followed
175 the pointer and fetched the complete object. (I don't really see
176 the point. Why not just determine the run-time type when you
177 indirect, and avoid the special case? The contents don't matter
178 until you indirect anyway.)
180 If we're not doing anything fancy, `enclosing_type' is equal to
181 `type', and `embedded_offset' is zero, so everything works
184 extern struct type
*value_enclosing_type (struct value
*);
185 extern void set_value_enclosing_type (struct value
*val
,
186 struct type
*new_type
);
188 /* Returns value_type or value_enclosing_type depending on
189 value_print_options.objectprint.
191 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
192 only for pointers and references, else it will be returned
193 for all the types (e.g. structures). This option is useful
194 to prevent retrieving enclosing type for the base classes fields.
196 REAL_TYPE_FOUND is used to inform whether the real type was found
197 (or just static type was used). The NULL may be passed if it is not
200 extern struct type
*value_actual_type (struct value
*value
,
201 int resolve_simple_types
,
202 int *real_type_found
);
204 extern int value_pointed_to_offset (struct value
*value
);
205 extern void set_value_pointed_to_offset (struct value
*value
, int val
);
206 extern int value_embedded_offset (struct value
*value
);
207 extern void set_value_embedded_offset (struct value
*value
, int val
);
209 /* For lval_computed values, this structure holds functions used to
210 retrieve and set the value (or portions of the value).
212 For each function, 'V' is the 'this' pointer: an lval_funcs
213 function F may always assume that the V it receives is an
214 lval_computed value, and has F in the appropriate slot of its
215 lval_funcs structure. */
219 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
220 a problem arises in obtaining VALUE's bits, this function should
221 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
222 non-optimized-out value is an internal error. */
223 void (*read
) (struct value
*v
);
225 /* Handle an assignment TOVAL = FROMVAL by writing the value of
226 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
227 been updated. If a problem arises in doing so, this function
228 should call 'error'. If it is NULL such TOVAL assignment is an error as
229 TOVAL is not considered as an lvalue. */
230 void (*write
) (struct value
*toval
, struct value
*fromval
);
232 /* If non-NULL, this is used to implement pointer indirection for
233 this value. This method may return NULL, in which case value_ind
234 will fall back to ordinary indirection. */
235 struct value
*(*indirect
) (struct value
*value
);
237 /* If non-NULL, this is used to implement reference resolving for
238 this value. This method may return NULL, in which case coerce_ref
239 will fall back to ordinary references resolving. */
240 struct value
*(*coerce_ref
) (const struct value
*value
);
242 /* If non-NULL, this is used to determine whether the indicated bits
243 of VALUE are a synthetic pointer. */
244 int (*check_synthetic_pointer
) (const struct value
*value
,
245 int offset
, int length
);
247 /* Return a duplicate of VALUE's closure, for use in a new value.
248 This may simply return the same closure, if VALUE's is
249 reference-counted or statically allocated.
251 This may be NULL, in which case VALUE's closure is re-used in the
253 void *(*copy_closure
) (const struct value
*v
);
255 /* Drop VALUE's reference to its closure. Maybe this frees the
256 closure; maybe this decrements a reference count; maybe the
257 closure is statically allocated and this does nothing.
259 This may be NULL, in which case no action is taken to free
261 void (*free_closure
) (struct value
*v
);
264 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
265 and closure CLOSURE. */
267 extern struct value
*allocate_computed_value (struct type
*type
,
268 const struct lval_funcs
*funcs
,
271 /* Helper function to check the validity of some bits of a value.
273 If TYPE represents some aggregate type (e.g., a structure), return 1.
275 Otherwise, any of the bytes starting at OFFSET and extending for
276 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
277 return 0. The checking is done using FUNCS.
279 Otherwise, return 1. */
281 extern int valprint_check_validity (struct ui_file
*stream
, struct type
*type
,
283 const struct value
*val
);
285 extern struct value
*allocate_optimized_out_value (struct type
*type
);
287 /* If VALUE is lval_computed, return its lval_funcs structure. */
289 extern const struct lval_funcs
*value_computed_funcs (const struct value
*);
291 /* If VALUE is lval_computed, return its closure. The meaning of the
292 returned value depends on the functions VALUE uses. */
294 extern void *value_computed_closure (const struct value
*value
);
296 /* If zero, contents of this value are in the contents field. If
297 nonzero, contents are in inferior. If the lval field is lval_memory,
298 the contents are in inferior memory at location.address plus offset.
299 The lval field may also be lval_register.
301 WARNING: This field is used by the code which handles watchpoints
302 (see breakpoint.c) to decide whether a particular value can be
303 watched by hardware watchpoints. If the lazy flag is set for some
304 member of a value chain, it is assumed that this member of the
305 chain doesn't need to be watched as part of watching the value
306 itself. This is how GDB avoids watching the entire struct or array
307 when the user wants to watch a single struct member or array
308 element. If you ever change the way lazy flag is set and reset, be
309 sure to consider this use as well! */
311 extern int value_lazy (struct value
*);
312 extern void set_value_lazy (struct value
*value
, int val
);
314 extern int value_stack (struct value
*);
315 extern void set_value_stack (struct value
*value
, int val
);
317 /* Throw an error complaining that the value has been optimized
320 extern void error_value_optimized_out (void);
322 /* value_contents() and value_contents_raw() both return the address
323 of the gdb buffer used to hold a copy of the contents of the lval.
324 value_contents() is used when the contents of the buffer are needed
325 -- it uses value_fetch_lazy() to load the buffer from the process
326 being debugged if it hasn't already been loaded
327 (value_contents_writeable() is used when a writeable but fetched
328 buffer is required).. value_contents_raw() is used when data is
329 being stored into the buffer, or when it is certain that the
330 contents of the buffer are valid.
332 Note: The contents pointer is adjusted by the offset required to
333 get to the real subobject, if the value happens to represent
334 something embedded in a larger run-time object. */
336 extern gdb_byte
*value_contents_raw (struct value
*);
338 /* Actual contents of the value. For use of this value; setting it
339 uses the stuff above. Not valid if lazy is nonzero. Target
340 byte-order. We force it to be aligned properly for any possible
341 value. Note that a value therefore extends beyond what is
344 extern const gdb_byte
*value_contents (struct value
*);
345 extern gdb_byte
*value_contents_writeable (struct value
*);
347 /* The ALL variants of the above two macros do not adjust the returned
348 pointer by the embedded_offset value. */
350 extern gdb_byte
*value_contents_all_raw (struct value
*);
351 extern const gdb_byte
*value_contents_all (struct value
*);
353 /* Like value_contents_all, but does not require that the returned
354 bits be valid. This should only be used in situations where you
355 plan to check the validity manually. */
356 extern const gdb_byte
*value_contents_for_printing (struct value
*value
);
358 /* Like value_contents_for_printing, but accepts a constant value
359 pointer. Unlike value_contents_for_printing however, the pointed
360 value must _not_ be lazy. */
361 extern const gdb_byte
*
362 value_contents_for_printing_const (const struct value
*value
);
364 extern int value_fetch_lazy (struct value
*val
);
366 /* If nonzero, this is the value of a variable which does not actually
367 exist in the program, at least partially. If the value is lazy,
368 this may fetch it now. */
369 extern int value_optimized_out (struct value
*value
);
371 /* Given a value, return true if any of the contents bits starting at
372 OFFSET and extending for LENGTH bits is optimized out, false
375 extern int value_bits_any_optimized_out (const struct value
*value
,
376 int bit_offset
, int bit_length
);
378 /* Like value_optimized_out, but return true iff the whole value is
380 extern int value_entirely_optimized_out (struct value
*value
);
382 /* Mark VALUE's content bytes starting at OFFSET and extending for
383 LENGTH bytes as optimized out. */
385 extern void mark_value_bytes_optimized_out (struct value
*value
,
386 int offset
, int length
);
388 /* Mark VALUE's content bits starting at OFFSET and extending for
389 LENGTH bits as optimized out. */
391 extern void mark_value_bits_optimized_out (struct value
*value
,
392 int offset
, int length
);
394 /* Set or return field indicating whether a variable is initialized or
395 not, based on debugging information supplied by the compiler.
396 1 = initialized; 0 = uninitialized. */
397 extern int value_initialized (struct value
*);
398 extern void set_value_initialized (struct value
*, int);
400 /* Set COMPONENT's location as appropriate for a component of WHOLE
401 --- regardless of what kind of lvalue WHOLE is. */
402 extern void set_value_component_location (struct value
*component
,
403 const struct value
*whole
);
405 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
406 single value might have multiple LVALs), this hacked interface is
407 limited to just the first PIECE. Expect further change. */
408 /* Type of value; either not an lval, or one of the various different
409 possible kinds of lval. */
410 extern enum lval_type
*deprecated_value_lval_hack (struct value
*);
411 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
413 /* Like VALUE_LVAL, except the parameter can be const. */
414 extern enum lval_type
value_lval_const (const struct value
*value
);
416 /* If lval == lval_memory, return the address in the inferior. If
417 lval == lval_register, return the byte offset into the registers
418 structure. Otherwise, return 0. The returned address
419 includes the offset, if any. */
420 extern CORE_ADDR
value_address (const struct value
*);
422 /* Like value_address, except the result does not include value's
424 extern CORE_ADDR
value_raw_address (struct value
*);
426 /* Set the address of a value. */
427 extern void set_value_address (struct value
*, CORE_ADDR
);
429 /* Pointer to internal variable. */
430 extern struct internalvar
**deprecated_value_internalvar_hack (struct value
*);
431 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
433 /* Frame register value is relative to. This will be described in the
434 lval enum above as "lval_register". */
435 extern struct frame_id
*deprecated_value_frame_id_hack (struct value
*);
436 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
438 /* Register number if the value is from a register. */
439 extern short *deprecated_value_regnum_hack (struct value
*);
440 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
442 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
443 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
445 extern struct value
*coerce_ref_if_computed (const struct value
*arg
);
447 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
448 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
449 ORIGINAL_VAL are the type and value of the original reference or pointer.
451 Note, that VALUE is modified by this function.
453 It is a common implementation for coerce_ref and value_ind. */
455 extern struct value
* readjust_indirect_value_type (struct value
*value
,
456 struct type
*enc_type
,
457 struct type
*original_type
,
458 struct value
*original_val
);
460 /* Convert a REF to the object referenced. */
462 extern struct value
*coerce_ref (struct value
*value
);
464 /* If ARG is an array, convert it to a pointer.
465 If ARG is a function, convert it to a function pointer.
467 References are dereferenced. */
469 extern struct value
*coerce_array (struct value
*value
);
471 /* Given a value, determine whether the bits starting at OFFSET and
472 extending for LENGTH bits are a synthetic pointer. */
474 extern int value_bits_synthetic_pointer (const struct value
*value
,
475 int offset
, int length
);
477 /* Given a value, determine whether the contents bytes starting at
478 OFFSET and extending for LENGTH bytes are available. This returns
479 nonzero if all bytes in the given range are available, zero if any
480 byte is unavailable. */
482 extern int value_bytes_available (const struct value
*value
,
483 int offset
, int length
);
485 /* Given a value, determine whether the contents bits starting at
486 OFFSET and extending for LENGTH bits are available. This returns
487 nonzero if all bits in the given range are available, zero if any
488 bit is unavailable. */
490 extern int value_bits_available (const struct value
*value
,
491 int offset
, int length
);
493 /* Like value_bytes_available, but return false if any byte in the
494 whole object is unavailable. */
495 extern int value_entirely_available (struct value
*value
);
497 /* Like value_entirely_available, but return false if any byte in the
498 whole object is available. */
499 extern int value_entirely_unavailable (struct value
*value
);
501 /* Mark VALUE's content bytes starting at OFFSET and extending for
502 LENGTH bytes as unavailable. */
504 extern void mark_value_bytes_unavailable (struct value
*value
,
505 int offset
, int length
);
507 /* Mark VALUE's content bits starting at OFFSET and extending for
508 LENGTH bits as unavailable. */
510 extern void mark_value_bits_unavailable (struct value
*value
,
511 int offset
, int length
);
513 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
514 LENGTH bytes of VAL2's contents starting at OFFSET2.
516 Note that "contents" refers to the whole value's contents
517 (value_contents_all), without any embedded offset adjustment. For
518 example, to compare a complete object value with itself, including
519 its enclosing type chunk, you'd do:
521 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
522 value_contents_eq (val, 0, val, 0, len);
524 Returns true iff the set of available/valid contents match.
526 Optimized-out contents are equal to optimized-out contents, and are
527 not equal to non-optimized-out contents.
529 Unavailable contente are equal to unavailable contents, and are not
530 equal to non-unavailable contents.
532 For example, if 'x's represent an unavailable byte, and 'V' and 'Z'
533 represent different available/valid bytes, in a value with length
537 contents: xxxxVVVVxxxxVVZZ
541 value_contents_eq(val, 0, val, 8, 6) => 1
542 value_contents_eq(val, 0, val, 4, 4) => 0
543 value_contents_eq(val, 0, val, 8, 8) => 0
544 value_contents_eq(val, 4, val, 12, 2) => 1
545 value_contents_eq(val, 4, val, 12, 4) => 0
546 value_contents_eq(val, 3, val, 4, 4) => 0
548 If 'x's represent an unavailable byte, 'o' represents an optimized
549 out byte, in a value with length 8:
556 value_contents_eq(val, 0, val, 2, 2) => 1
557 value_contents_eq(val, 4, val, 6, 2) => 1
558 value_contents_eq(val, 0, val, 4, 4) => 0
560 We only know whether a value chunk is unavailable or optimized out
561 if we've tried to read it. As this routine is used by printing
562 routines, which may be printing values in the value history, long
563 after the inferior is gone, it works with const values. Therefore,
564 this routine must not be called with lazy values. */
566 extern int value_contents_eq (const struct value
*val1
, int offset1
,
567 const struct value
*val2
, int offset2
,
570 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
571 is (or will be copied to) VAL's contents buffer offset by
572 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
573 Marks value contents ranges as unavailable if the corresponding
574 memory is likewise unavailable. STACK indicates whether the memory
575 is known to be stack memory. */
577 extern void read_value_memory (struct value
*val
, int embedded_offset
,
578 int stack
, CORE_ADDR memaddr
,
579 gdb_byte
*buffer
, size_t length
);
581 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
582 into each element of a new vector value with VECTOR_TYPE. */
584 struct value
*value_vector_widen (struct value
*scalar_value
,
585 struct type
*vector_type
);
590 #include "gdbtypes.h"
591 #include "expression.h"
596 extern int print_address_demangle (const struct value_print_options
*,
597 struct gdbarch
*, CORE_ADDR
,
598 struct ui_file
*, int);
600 extern LONGEST
value_as_long (struct value
*val
);
601 extern DOUBLEST
value_as_double (struct value
*val
);
602 extern CORE_ADDR
value_as_address (struct value
*val
);
604 extern LONGEST
unpack_long (struct type
*type
, const gdb_byte
*valaddr
);
605 extern DOUBLEST
unpack_double (struct type
*type
, const gdb_byte
*valaddr
,
607 extern CORE_ADDR
unpack_pointer (struct type
*type
, const gdb_byte
*valaddr
);
609 extern LONGEST
unpack_field_as_long (struct type
*type
,
610 const gdb_byte
*valaddr
,
612 extern int unpack_value_field_as_long (struct type
*type
, const gdb_byte
*valaddr
,
613 int embedded_offset
, int fieldno
,
614 const struct value
*val
, LONGEST
*result
);
616 extern struct value
*value_field_bitfield (struct type
*type
, int fieldno
,
617 const gdb_byte
*valaddr
,
619 const struct value
*val
);
621 extern void pack_long (gdb_byte
*buf
, struct type
*type
, LONGEST num
);
623 extern struct value
*value_from_longest (struct type
*type
, LONGEST num
);
624 extern struct value
*value_from_ulongest (struct type
*type
, ULONGEST num
);
625 extern struct value
*value_from_pointer (struct type
*type
, CORE_ADDR addr
);
626 extern struct value
*value_from_double (struct type
*type
, DOUBLEST num
);
627 extern struct value
*value_from_decfloat (struct type
*type
,
628 const gdb_byte
*decbytes
);
629 extern struct value
*value_from_history_ref (const char *, const char **);
631 extern struct value
*value_at (struct type
*type
, CORE_ADDR addr
);
632 extern struct value
*value_at_lazy (struct type
*type
, CORE_ADDR addr
);
634 extern struct value
*value_from_contents_and_address_unresolved
635 (struct type
*, const gdb_byte
*, CORE_ADDR
);
636 extern struct value
*value_from_contents_and_address (struct type
*,
639 extern struct value
*value_from_contents (struct type
*, const gdb_byte
*);
641 extern struct value
*default_value_from_register (struct gdbarch
*gdbarch
,
644 struct frame_id frame_id
);
646 extern void read_frame_register_value (struct value
*value
,
647 struct frame_info
*frame
);
649 extern struct value
*value_from_register (struct type
*type
, int regnum
,
650 struct frame_info
*frame
);
652 extern CORE_ADDR
address_from_register (int regnum
,
653 struct frame_info
*frame
);
655 extern struct value
*value_of_variable (struct symbol
*var
,
656 const struct block
*b
);
658 extern struct value
*address_of_variable (struct symbol
*var
,
659 const struct block
*b
);
661 extern struct value
*value_of_register (int regnum
, struct frame_info
*frame
);
663 struct value
*value_of_register_lazy (struct frame_info
*frame
, int regnum
);
665 extern int symbol_read_needs_frame (struct symbol
*);
667 extern struct value
*read_var_value (struct symbol
*var
,
668 struct frame_info
*frame
);
670 extern struct value
*default_read_var_value (struct symbol
*var
,
671 struct frame_info
*frame
);
673 extern struct value
*allocate_value (struct type
*type
);
674 extern struct value
*allocate_value_lazy (struct type
*type
);
675 extern void value_contents_copy (struct value
*dst
, int dst_offset
,
676 struct value
*src
, int src_offset
,
678 extern void value_contents_copy_raw (struct value
*dst
, int dst_offset
,
679 struct value
*src
, int src_offset
,
682 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
684 extern struct value
*value_mark (void);
686 extern void value_free_to_mark (struct value
*mark
);
688 extern struct value
*value_cstring (char *ptr
, ssize_t len
,
689 struct type
*char_type
);
690 extern struct value
*value_string (char *ptr
, ssize_t len
,
691 struct type
*char_type
);
693 extern struct value
*value_array (int lowbound
, int highbound
,
694 struct value
**elemvec
);
696 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
698 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
701 extern struct value
*value_ptradd (struct value
*arg1
, LONGEST arg2
);
703 extern LONGEST
value_ptrdiff (struct value
*arg1
, struct value
*arg2
);
705 extern int value_must_coerce_to_target (struct value
*arg1
);
707 extern struct value
*value_coerce_to_target (struct value
*arg1
);
709 extern struct value
*value_coerce_array (struct value
*arg1
);
711 extern struct value
*value_coerce_function (struct value
*arg1
);
713 extern struct value
*value_ind (struct value
*arg1
);
715 extern struct value
*value_addr (struct value
*arg1
);
717 extern struct value
*value_ref (struct value
*arg1
);
719 extern struct value
*value_assign (struct value
*toval
,
720 struct value
*fromval
);
722 extern struct value
*value_pos (struct value
*arg1
);
724 extern struct value
*value_neg (struct value
*arg1
);
726 extern struct value
*value_complement (struct value
*arg1
);
728 extern struct value
*value_struct_elt (struct value
**argp
,
730 const char *name
, int *static_memfuncp
,
733 extern struct value
*value_struct_elt_bitpos (struct value
**argp
,
735 struct type
*field_type
,
738 extern struct value
*value_aggregate_elt (struct type
*curtype
,
740 struct type
*expect_type
,
744 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
746 enum oload_search_type
{ NON_METHOD
, METHOD
, BOTH
};
748 extern int find_overload_match (struct value
**args
, int nargs
,
750 enum oload_search_type method
,
751 struct value
**objp
, struct symbol
*fsym
,
752 struct value
**valp
, struct symbol
**symp
,
753 int *staticp
, const int no_adl
,
756 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
758 extern struct value
*value_primitive_field (struct value
*arg1
, int offset
,
760 struct type
*arg_type
);
763 extern struct type
*value_rtti_indirect_type (struct value
*, int *, int *,
766 extern struct value
*value_full_object (struct value
*, struct type
*, int,
769 extern struct value
*value_cast_pointers (struct type
*, struct value
*, int);
771 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
773 extern struct value
*value_reinterpret_cast (struct type
*type
,
776 extern struct value
*value_dynamic_cast (struct type
*type
, struct value
*arg
);
778 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
780 extern struct value
*value_one (struct type
*type
);
782 extern struct value
*value_repeat (struct value
*arg1
, int count
);
784 extern struct value
*value_subscript (struct value
*array
, LONGEST index
);
786 extern struct value
*value_bitstring_subscript (struct type
*type
,
787 struct value
*bitstring
,
790 extern struct value
*register_value_being_returned (struct type
*valtype
,
791 struct regcache
*retbuf
);
793 extern int value_in (struct value
*element
, struct value
*set
);
795 extern int value_bit_index (struct type
*type
, const gdb_byte
*addr
,
798 extern enum return_value_convention
799 struct_return_convention (struct gdbarch
*gdbarch
, struct value
*function
,
800 struct type
*value_type
);
802 extern int using_struct_return (struct gdbarch
*gdbarch
,
803 struct value
*function
,
804 struct type
*value_type
);
806 extern struct value
*evaluate_expression (struct expression
*exp
);
808 extern struct value
*evaluate_type (struct expression
*exp
);
810 extern struct value
*evaluate_subexp (struct type
*expect_type
,
811 struct expression
*exp
,
812 int *pos
, enum noside noside
);
814 extern struct value
*evaluate_subexpression_type (struct expression
*exp
,
817 extern void fetch_subexp_value (struct expression
*exp
, int *pc
,
818 struct value
**valp
, struct value
**resultp
,
819 struct value
**val_chain
,
820 int preserve_errors
);
822 extern char *extract_field_op (struct expression
*exp
, int *subexp
);
824 extern struct value
*evaluate_subexp_with_coercion (struct expression
*,
827 extern struct value
*parse_and_eval (const char *exp
);
829 extern struct value
*parse_to_comma_and_eval (const char **expp
);
831 extern struct type
*parse_and_eval_type (char *p
, int length
);
833 extern CORE_ADDR
parse_and_eval_address (const char *exp
);
835 extern LONGEST
parse_and_eval_long (const char *exp
);
837 extern void unop_promote (const struct language_defn
*language
,
838 struct gdbarch
*gdbarch
,
839 struct value
**arg1
);
841 extern void binop_promote (const struct language_defn
*language
,
842 struct gdbarch
*gdbarch
,
843 struct value
**arg1
, struct value
**arg2
);
845 extern struct value
*access_value_history (int num
);
847 extern struct value
*value_of_internalvar (struct gdbarch
*gdbarch
,
848 struct internalvar
*var
);
850 extern int get_internalvar_integer (struct internalvar
*var
, LONGEST
*l
);
852 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
854 extern void set_internalvar_integer (struct internalvar
*var
, LONGEST l
);
856 extern void set_internalvar_string (struct internalvar
*var
,
859 extern void clear_internalvar (struct internalvar
*var
);
861 extern void set_internalvar_component (struct internalvar
*var
,
863 int bitpos
, int bitsize
,
864 struct value
*newvalue
);
866 extern struct internalvar
*lookup_only_internalvar (const char *name
);
868 extern struct internalvar
*create_internalvar (const char *name
);
870 extern VEC (char_ptr
) *complete_internalvar (const char *name
);
872 /* An internalvar can be dynamically computed by supplying a vector of
873 function pointers to perform various operations. */
875 struct internalvar_funcs
877 /* Compute the value of the variable. The DATA argument passed to
878 the function is the same argument that was passed to
879 `create_internalvar_type_lazy'. */
881 struct value
*(*make_value
) (struct gdbarch
*arch
,
882 struct internalvar
*var
,
885 /* Update the agent expression EXPR with bytecode to compute the
886 value. VALUE is the agent value we are updating. The DATA
887 argument passed to this function is the same argument that was
888 passed to `create_internalvar_type_lazy'. If this pointer is
889 NULL, then the internalvar cannot be compiled to an agent
892 void (*compile_to_ax
) (struct internalvar
*var
,
893 struct agent_expr
*expr
,
894 struct axs_value
*value
,
897 /* If non-NULL, this is called to destroy DATA. The DATA argument
898 passed to this function is the same argument that was passed to
899 `create_internalvar_type_lazy'. */
901 void (*destroy
) (void *data
);
904 extern struct internalvar
*create_internalvar_type_lazy (const char *name
,
905 const struct internalvar_funcs
*funcs
,
908 /* Compile an internal variable to an agent expression. VAR is the
909 variable to compile; EXPR and VALUE are the agent expression we are
910 updating. This will return 0 if there is no known way to compile
911 VAR, and 1 if VAR was successfully compiled. It may also throw an
912 exception on error. */
914 extern int compile_internalvar_to_ax (struct internalvar
*var
,
915 struct agent_expr
*expr
,
916 struct axs_value
*value
);
918 extern struct internalvar
*lookup_internalvar (const char *name
);
920 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
922 extern int value_equal_contents (struct value
*arg1
, struct value
*arg2
);
924 extern int value_less (struct value
*arg1
, struct value
*arg2
);
926 extern int value_logical_not (struct value
*arg1
);
930 extern struct value
*value_of_this (const struct language_defn
*lang
);
932 extern struct value
*value_of_this_silent (const struct language_defn
*lang
);
934 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
936 enum exp_opcode otherop
,
939 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
942 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
943 int j
, struct type
*type
, int offset
);
945 extern int binop_types_user_defined_p (enum exp_opcode op
,
949 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
952 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
954 extern int destructor_name_p (const char *name
, struct type
*type
);
956 extern void value_incref (struct value
*val
);
958 extern void value_free (struct value
*val
);
960 extern void free_all_values (void);
962 extern void free_value_chain (struct value
*v
);
964 extern void release_value (struct value
*val
);
966 extern void release_value_or_incref (struct value
*val
);
968 extern int record_latest_value (struct value
*val
);
970 extern void modify_field (struct type
*type
, gdb_byte
*addr
,
971 LONGEST fieldval
, int bitpos
, int bitsize
);
973 extern void type_print (struct type
*type
, const char *varstring
,
974 struct ui_file
*stream
, int show
);
976 extern char *type_to_string (struct type
*type
);
978 extern gdb_byte
*baseclass_addr (struct type
*type
, int index
,
980 struct value
**valuep
, int *errp
);
982 extern void print_longest (struct ui_file
*stream
, int format
,
983 int use_local
, LONGEST val
);
985 extern void print_floating (const gdb_byte
*valaddr
, struct type
*type
,
986 struct ui_file
*stream
);
988 extern void print_decimal_floating (const gdb_byte
*valaddr
, struct type
*type
,
989 struct ui_file
*stream
);
991 extern void value_print (struct value
*val
, struct ui_file
*stream
,
992 const struct value_print_options
*options
);
994 extern void value_print_array_elements (struct value
*val
,
995 struct ui_file
*stream
, int format
,
996 enum val_prettyformat pretty
);
998 extern struct value
*value_release_to_mark (struct value
*mark
);
1000 extern void val_print (struct type
*type
, const gdb_byte
*valaddr
,
1001 int embedded_offset
, CORE_ADDR address
,
1002 struct ui_file
*stream
, int recurse
,
1003 const struct value
*val
,
1004 const struct value_print_options
*options
,
1005 const struct language_defn
*language
);
1007 extern void common_val_print (struct value
*val
,
1008 struct ui_file
*stream
, int recurse
,
1009 const struct value_print_options
*options
,
1010 const struct language_defn
*language
);
1012 extern int val_print_string (struct type
*elttype
, const char *encoding
,
1013 CORE_ADDR addr
, int len
,
1014 struct ui_file
*stream
,
1015 const struct value_print_options
*options
);
1017 extern void print_variable_and_value (const char *name
,
1019 struct frame_info
*frame
,
1020 struct ui_file
*stream
,
1023 extern void typedef_print (struct type
*type
, struct symbol
*news
,
1024 struct ui_file
*stream
);
1026 extern char *internalvar_name (struct internalvar
*var
);
1028 extern void preserve_values (struct objfile
*);
1032 extern struct value
*value_copy (struct value
*);
1034 extern struct value
*value_non_lval (struct value
*);
1036 extern void preserve_one_value (struct value
*, struct objfile
*, htab_t
);
1040 extern struct value
*varying_to_slice (struct value
*);
1042 extern struct value
*value_slice (struct value
*, int, int);
1044 extern struct value
*value_literal_complex (struct value
*, struct value
*,
1047 extern struct value
*find_function_in_inferior (const char *,
1050 extern struct value
*value_allocate_space_in_inferior (int);
1052 extern struct value
*value_subscripted_rvalue (struct value
*array
,
1053 LONGEST index
, int lowerbound
);
1055 /* User function handler. */
1057 typedef struct value
*(*internal_function_fn
) (struct gdbarch
*gdbarch
,
1058 const struct language_defn
*language
,
1061 struct value
**argv
);
1063 void add_internal_function (const char *name
, const char *doc
,
1064 internal_function_fn handler
,
1067 struct value
*call_internal_function (struct gdbarch
*gdbarch
,
1068 const struct language_defn
*language
,
1069 struct value
*function
,
1070 int argc
, struct value
**argv
);
1072 char *value_internal_function_name (struct value
*);
1074 extern struct value
*value_of_xmethod (struct xmethod_worker
*);
1076 struct value
*call_xmethod (struct value
*function
,
1077 int argc
, struct value
**argv
);
1079 #endif /* !defined (VALUE_H) */