1 /* Definitions for values of C expressions, for GDB.
3 Copyright (C) 1986-2012 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;
35 /* The structure which defines the type of a value. It should never
36 be possible for a program lval value to survive over a call to the
37 inferior (i.e. to be put into the history list or an internal
42 /* Values are stored in a chain, so that they can be deleted easily
43 over calls to the inferior. Values assigned to internal variables,
44 put into the value history or exposed to Python are taken off this
47 struct value *value_next (struct value *);
49 /* Type of the value. */
51 extern struct type *value_type (const struct value *);
53 /* This is being used to change the type of an existing value, that
54 code should instead be creating a new value with the changed type
55 (but possibly shared content). */
57 extern void deprecated_set_value_type (struct value *value,
60 /* Only used for bitfields; number of bits contained in them. */
62 extern int value_bitsize (const struct value *);
63 extern void set_value_bitsize (struct value *, int bit);
65 /* Only used for bitfields; position of start of field. For
66 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
67 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
69 extern int value_bitpos (const struct value *);
70 extern void set_value_bitpos (struct value *, int bit);
72 /* Only used for bitfields; the containing value. This allows a
73 single read from the target when displaying multiple
76 struct value *value_parent (struct value *);
77 extern void set_value_parent (struct value *value, struct value *parent);
79 /* Describes offset of a value within lval of a structure in bytes.
80 If lval == lval_memory, this is an offset to the address. If lval
81 == lval_register, this is a further offset from location.address
82 within the registers structure. Note also the member
83 embedded_offset below. */
85 extern int value_offset (const struct value *);
86 extern void set_value_offset (struct value *, int offset);
88 /* The comment from "struct value" reads: ``Is it modifiable? Only
89 relevant if lval != not_lval.''. Shouldn't the value instead be
90 not_lval and be done with it? */
92 extern int deprecated_value_modifiable (struct value *value);
93 extern void deprecated_set_value_modifiable (struct value *value,
96 /* If a value represents a C++ object, then the `type' field gives the
97 object's compile-time type. If the object actually belongs to some
98 class derived from `type', perhaps with other base classes and
99 additional members, then `type' is just a subobject of the real
100 thing, and the full object is probably larger than `type' would
103 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
104 actually determine the object's run-time type by looking at the
105 run-time type information in the vtable. When this information is
106 available, we may elect to read in the entire object, for several
109 - When printing the value, the user would probably rather see the
110 full object, not just the limited portion apparent from the
113 - If `type' has virtual base classes, then even printing `type'
114 alone may require reaching outside the `type' portion of the
115 object to wherever the virtual base class has been stored.
117 When we store the entire object, `enclosing_type' is the run-time
118 type -- the complete object -- and `embedded_offset' is the offset
119 of `type' within that larger type, in bytes. The value_contents()
120 macro takes `embedded_offset' into account, so most GDB code
121 continues to see the `type' portion of the value, just as the
124 If `type' is a pointer to an object, then `enclosing_type' is a
125 pointer to the object's run-time type, and `pointed_to_offset' is
126 the offset in bytes from the full object to the pointed-to object
127 -- that is, the value `embedded_offset' would have if we followed
128 the pointer and fetched the complete object. (I don't really see
129 the point. Why not just determine the run-time type when you
130 indirect, and avoid the special case? The contents don't matter
131 until you indirect anyway.)
133 If we're not doing anything fancy, `enclosing_type' is equal to
134 `type', and `embedded_offset' is zero, so everything works
137 extern struct type *value_enclosing_type (struct value *);
138 extern void set_value_enclosing_type (struct value *val,
139 struct type *new_type);
141 /* Returns value_type or value_enclosing_type depending on
142 value_print_options.objectprint.
144 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
145 only for pointers and references, else it will be returned
146 for all the types (e.g. structures). This option is useful
147 to prevent retrieving enclosing type for the base classes fields.
149 REAL_TYPE_FOUND is used to inform whether the real type was found
150 (or just static type was used). The NULL may be passed if it is not
153 extern struct type *value_actual_type (struct value *value,
154 int resolve_simple_types,
155 int *real_type_found);
157 extern int value_pointed_to_offset (struct value *value);
158 extern void set_value_pointed_to_offset (struct value *value, int val);
159 extern int value_embedded_offset (struct value *value);
160 extern void set_value_embedded_offset (struct value *value, int val);
162 /* For lval_computed values, this structure holds functions used to
163 retrieve and set the value (or portions of the value).
165 For each function, 'V' is the 'this' pointer: an lval_funcs
166 function F may always assume that the V it receives is an
167 lval_computed value, and has F in the appropriate slot of its
168 lval_funcs structure. */
172 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
173 a problem arises in obtaining VALUE's bits, this function should
174 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
175 non-optimized-out value is an internal error. */
176 void (*read) (struct value *v);
178 /* Handle an assignment TOVAL = FROMVAL by writing the value of
179 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
180 been updated. If a problem arises in doing so, this function
181 should call 'error'. If it is NULL such TOVAL assignment is an error as
182 TOVAL is not considered as an lvalue. */
183 void (*write) (struct value *toval, struct value *fromval);
185 /* Check the validity of some bits in VALUE. This should return 1
186 if all the bits starting at OFFSET and extending for LENGTH bits
187 are valid, or 0 if any bit is invalid. */
188 int (*check_validity) (const struct value *value, int offset, int length);
190 /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid. */
191 int (*check_any_valid) (const struct value *value);
193 /* If non-NULL, this is used to implement pointer indirection for
194 this value. This method may return NULL, in which case value_ind
195 will fall back to ordinary indirection. */
196 struct value *(*indirect) (struct value *value);
198 /* If non-NULL, this is used to implement reference resolving for
199 this value. This method may return NULL, in which case coerce_ref
200 will fall back to ordinary references resolving. */
201 struct value *(*coerce_ref) (const struct value *value);
203 /* If non-NULL, this is used to determine whether the indicated bits
204 of VALUE are a synthetic pointer. */
205 int (*check_synthetic_pointer) (const struct value *value,
206 int offset, int length);
208 /* Return a duplicate of VALUE's closure, for use in a new value.
209 This may simply return the same closure, if VALUE's is
210 reference-counted or statically allocated.
212 This may be NULL, in which case VALUE's closure is re-used in the
214 void *(*copy_closure) (const struct value *v);
216 /* Drop VALUE's reference to its closure. Maybe this frees the
217 closure; maybe this decrements a reference count; maybe the
218 closure is statically allocated and this does nothing.
220 This may be NULL, in which case no action is taken to free
222 void (*free_closure) (struct value *v);
225 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
226 and closure CLOSURE. */
228 extern struct value *allocate_computed_value (struct type *type,
229 const struct lval_funcs *funcs,
232 /* Helper function to check the validity of some bits of a value.
234 If TYPE represents some aggregate type (e.g., a structure), return 1.
236 Otherwise, any of the bytes starting at OFFSET and extending for
237 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
238 return 0. The checking is done using FUNCS.
240 Otherwise, return 1. */
242 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
244 const struct value *val);
246 extern struct value *allocate_optimized_out_value (struct type *type);
248 /* If VALUE is lval_computed, return its lval_funcs structure. */
250 extern const struct lval_funcs *value_computed_funcs (const struct value *);
252 /* If VALUE is lval_computed, return its closure. The meaning of the
253 returned value depends on the functions VALUE uses. */
255 extern void *value_computed_closure (const struct value *value);
257 /* If zero, contents of this value are in the contents field. If
258 nonzero, contents are in inferior. If the lval field is lval_memory,
259 the contents are in inferior memory at location.address plus offset.
260 The lval field may also be lval_register.
262 WARNING: This field is used by the code which handles watchpoints
263 (see breakpoint.c) to decide whether a particular value can be
264 watched by hardware watchpoints. If the lazy flag is set for some
265 member of a value chain, it is assumed that this member of the
266 chain doesn't need to be watched as part of watching the value
267 itself. This is how GDB avoids watching the entire struct or array
268 when the user wants to watch a single struct member or array
269 element. If you ever change the way lazy flag is set and reset, be
270 sure to consider this use as well! */
272 extern int value_lazy (struct value *);
273 extern void set_value_lazy (struct value *value, int val);
275 extern int value_stack (struct value *);
276 extern void set_value_stack (struct value *value, int val);
278 /* value_contents() and value_contents_raw() both return the address
279 of the gdb buffer used to hold a copy of the contents of the lval.
280 value_contents() is used when the contents of the buffer are needed
281 -- it uses value_fetch_lazy() to load the buffer from the process
282 being debugged if it hasn't already been loaded
283 (value_contents_writeable() is used when a writeable but fetched
284 buffer is required).. value_contents_raw() is used when data is
285 being stored into the buffer, or when it is certain that the
286 contents of the buffer are valid.
288 Note: The contents pointer is adjusted by the offset required to
289 get to the real subobject, if the value happens to represent
290 something embedded in a larger run-time object. */
292 extern gdb_byte *value_contents_raw (struct value *);
294 /* Actual contents of the value. For use of this value; setting it
295 uses the stuff above. Not valid if lazy is nonzero. Target
296 byte-order. We force it to be aligned properly for any possible
297 value. Note that a value therefore extends beyond what is
300 extern const gdb_byte *value_contents (struct value *);
301 extern gdb_byte *value_contents_writeable (struct value *);
303 /* The ALL variants of the above two macros do not adjust the returned
304 pointer by the embedded_offset value. */
306 extern gdb_byte *value_contents_all_raw (struct value *);
307 extern const gdb_byte *value_contents_all (struct value *);
309 /* Like value_contents_all, but does not require that the returned
310 bits be valid. This should only be used in situations where you
311 plan to check the validity manually. */
312 extern const gdb_byte *value_contents_for_printing (struct value *value);
314 /* Like value_contents_for_printing, but accepts a constant value
315 pointer. Unlike value_contents_for_printing however, the pointed
316 value must _not_ be lazy. */
317 extern const gdb_byte *
318 value_contents_for_printing_const (const struct value *value);
320 extern int value_fetch_lazy (struct value *val);
321 extern int value_contents_equal (struct value *val1, struct value *val2);
323 /* If nonzero, this is the value of a variable which does not actually
324 exist in the program. */
325 extern int value_optimized_out (struct value *value);
326 extern void set_value_optimized_out (struct value *value, int val);
328 /* Like value_optimized_out, but return false if any bit in the object
330 extern int value_entirely_optimized_out (const struct value *value);
332 /* Set or return field indicating whether a variable is initialized or
333 not, based on debugging information supplied by the compiler.
334 1 = initialized; 0 = uninitialized. */
335 extern int value_initialized (struct value *);
336 extern void set_value_initialized (struct value *, int);
338 /* Set COMPONENT's location as appropriate for a component of WHOLE
339 --- regardless of what kind of lvalue WHOLE is. */
340 extern void set_value_component_location (struct value *component,
341 const struct value *whole);
343 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
344 single value might have multiple LVALs), this hacked interface is
345 limited to just the first PIECE. Expect further change. */
346 /* Type of value; either not an lval, or one of the various different
347 possible kinds of lval. */
348 extern enum lval_type *deprecated_value_lval_hack (struct value *);
349 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
351 /* Like VALUE_LVAL, except the parameter can be const. */
352 extern enum lval_type value_lval_const (const struct value *value);
354 /* If lval == lval_memory, return the address in the inferior. If
355 lval == lval_register, return the byte offset into the registers
356 structure. Otherwise, return 0. The returned address
357 includes the offset, if any. */
358 extern CORE_ADDR value_address (const struct value *);
360 /* Like value_address, except the result does not include value's
362 extern CORE_ADDR value_raw_address (struct value *);
364 /* Set the address of a value. */
365 extern void set_value_address (struct value *, CORE_ADDR);
367 /* Pointer to internal variable. */
368 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
369 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
371 /* Frame register value is relative to. This will be described in the
372 lval enum above as "lval_register". */
373 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
374 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
376 /* Register number if the value is from a register. */
377 extern short *deprecated_value_regnum_hack (struct value *);
378 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
380 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
381 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
383 extern struct value *coerce_ref_if_computed (const struct value *arg);
385 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
386 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
387 ORIGINAL_VAL are the type and value of the original reference or pointer.
389 Note, that VALUE is modified by this function.
391 It is a common implementation for coerce_ref and value_ind. */
393 extern struct value * readjust_indirect_value_type (struct value *value,
394 struct type *enc_type,
395 struct type *original_type,
396 struct value *original_val);
398 /* Convert a REF to the object referenced. */
400 extern struct value *coerce_ref (struct value *value);
402 /* If ARG is an array, convert it to a pointer.
403 If ARG is a function, convert it to a function pointer.
405 References are dereferenced. */
407 extern struct value *coerce_array (struct value *value);
409 /* Given a value, determine whether the bits starting at OFFSET and
410 extending for LENGTH bits are valid. This returns nonzero if all
411 bits in the given range are valid, zero if any bit is invalid. */
413 extern int value_bits_valid (const struct value *value,
414 int offset, int length);
416 /* Given a value, determine whether the bits starting at OFFSET and
417 extending for LENGTH bits are a synthetic pointer. */
419 extern int value_bits_synthetic_pointer (const struct value *value,
420 int offset, int length);
422 /* Given a value, determine whether the contents bytes starting at
423 OFFSET and extending for LENGTH bytes are available. This returns
424 nonzero if all bytes in the given range are available, zero if any
425 byte is unavailable. */
427 extern int value_bytes_available (const struct value *value,
428 int offset, int length);
430 /* Like value_bytes_available, but return false if any byte in the
431 whole object is unavailable. */
432 extern int value_entirely_available (struct value *value);
434 /* Mark VALUE's content bytes starting at OFFSET and extending for
435 LENGTH bytes as unavailable. */
437 extern void mark_value_bytes_unavailable (struct value *value,
438 int offset, int length);
440 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
441 LENGTH bytes of VAL2's contents starting at OFFSET2.
443 Note that "contents" refers to the whole value's contents
444 (value_contents_all), without any embedded offset adjustment. For
445 example, to compare a complete object value with itself, including
446 its enclosing type chunk, you'd do:
448 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
449 value_available_contents (val, 0, val, 0, len);
451 Returns true iff the set of available contents match. Unavailable
452 contents compare equal with unavailable contents, and different
453 with any available byte. For example, if 'x's represent an
454 unavailable byte, and 'V' and 'Z' represent different available
455 bytes, in a value with length 16:
458 contents: xxxxVVVVxxxxVVZZ
462 value_available_contents_eq(val, 0, val, 8, 6) => 1
463 value_available_contents_eq(val, 0, val, 4, 4) => 1
464 value_available_contents_eq(val, 0, val, 8, 8) => 0
465 value_available_contents_eq(val, 4, val, 12, 2) => 1
466 value_available_contents_eq(val, 4, val, 12, 4) => 0
467 value_available_contents_eq(val, 3, val, 4, 4) => 0
470 extern int value_available_contents_eq (const struct value *val1, int offset1,
471 const struct value *val2, int offset2,
474 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
475 is (or will be copied to) VAL's contents buffer offset by
476 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
477 Marks value contents ranges as unavailable if the corresponding
478 memory is likewise unavailable. STACK indicates whether the memory
479 is known to be stack memory. */
481 extern void read_value_memory (struct value *val, int embedded_offset,
482 int stack, CORE_ADDR memaddr,
483 gdb_byte *buffer, size_t length);
488 #include "gdbtypes.h"
489 #include "expression.h"
494 extern int print_address_demangle (const struct value_print_options *,
495 struct gdbarch *, CORE_ADDR,
496 struct ui_file *, int);
498 extern LONGEST value_as_long (struct value *val);
499 extern DOUBLEST value_as_double (struct value *val);
500 extern CORE_ADDR value_as_address (struct value *val);
502 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
503 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
505 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
507 extern int unpack_value_bits_as_long (struct type *field_type,
508 const gdb_byte *valaddr,
509 int embedded_offset, int bitpos,
511 const struct value *original_value,
514 extern LONGEST unpack_field_as_long (struct type *type,
515 const gdb_byte *valaddr,
517 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
518 int embedded_offset, int fieldno,
519 const struct value *val, LONGEST *result);
521 extern struct value *value_field_bitfield (struct type *type, int fieldno,
522 const gdb_byte *valaddr,
524 const struct value *val);
526 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
528 extern struct value *value_from_longest (struct type *type, LONGEST num);
529 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
530 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
531 extern struct value *value_from_double (struct type *type, DOUBLEST num);
532 extern struct value *value_from_decfloat (struct type *type,
533 const gdb_byte *decbytes);
534 extern struct value *value_from_history_ref (char *, char **);
536 extern struct value *value_at (struct type *type, CORE_ADDR addr);
537 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
539 extern struct value *value_from_contents_and_address (struct type *,
542 extern struct value *value_from_contents (struct type *, const gdb_byte *);
544 extern struct value *default_value_from_register (struct type *type,
546 struct frame_info *frame);
548 extern void read_frame_register_value (struct value *value,
549 struct frame_info *frame);
551 extern struct value *value_from_register (struct type *type, int regnum,
552 struct frame_info *frame);
554 extern CORE_ADDR address_from_register (struct type *type, int regnum,
555 struct frame_info *frame);
557 extern struct value *value_of_variable (struct symbol *var,
558 const struct block *b);
560 extern struct value *address_of_variable (struct symbol *var, struct block *b);
562 extern struct value *value_of_register (int regnum, struct frame_info *frame);
564 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
566 extern int symbol_read_needs_frame (struct symbol *);
568 extern struct value *read_var_value (struct symbol *var,
569 struct frame_info *frame);
571 extern struct value *default_read_var_value (struct symbol *var,
572 struct frame_info *frame);
574 extern struct value *allocate_value (struct type *type);
575 extern struct value *allocate_value_lazy (struct type *type);
576 extern void allocate_value_contents (struct value *value);
577 extern void value_contents_copy (struct value *dst, int dst_offset,
578 struct value *src, int src_offset,
580 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
581 struct value *src, int src_offset,
584 extern struct value *allocate_repeat_value (struct type *type, int count);
586 extern struct value *value_mark (void);
588 extern void value_free_to_mark (struct value *mark);
590 extern struct value *value_cstring (char *ptr, int len,
591 struct type *char_type);
592 extern struct value *value_string (char *ptr, int len,
593 struct type *char_type);
594 extern struct value *value_bitstring (char *ptr, int len,
595 struct type *index_type);
597 extern struct value *value_array (int lowbound, int highbound,
598 struct value **elemvec);
600 extern struct value *value_concat (struct value *arg1, struct value *arg2);
602 extern struct value *value_binop (struct value *arg1, struct value *arg2,
605 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
607 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
609 extern int value_must_coerce_to_target (struct value *arg1);
611 extern struct value *value_coerce_to_target (struct value *arg1);
613 extern struct value *value_coerce_array (struct value *arg1);
615 extern struct value *value_coerce_function (struct value *arg1);
617 extern struct value *value_ind (struct value *arg1);
619 extern struct value *value_addr (struct value *arg1);
621 extern struct value *value_ref (struct value *arg1);
623 extern struct value *value_assign (struct value *toval,
624 struct value *fromval);
626 extern struct value *value_pos (struct value *arg1);
628 extern struct value *value_neg (struct value *arg1);
630 extern struct value *value_complement (struct value *arg1);
632 extern struct value *value_struct_elt (struct value **argp,
634 const char *name, int *static_memfuncp,
637 extern struct value *value_aggregate_elt (struct type *curtype,
639 struct type *expect_type,
643 extern struct value *value_static_field (struct type *type, int fieldno);
645 extern struct fn_field *value_find_oload_method_list (struct value **,
648 struct type **, int *);
650 enum oload_search_type { NON_METHOD, METHOD, BOTH };
652 extern int find_overload_match (struct value **args, int nargs,
654 enum oload_search_type method, int lax,
655 struct value **objp, struct symbol *fsym,
656 struct value **valp, struct symbol **symp,
657 int *staticp, const int no_adl);
659 extern struct value *value_field (struct value *arg1, int fieldno);
661 extern struct value *value_primitive_field (struct value *arg1, int offset,
663 struct type *arg_type);
666 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
669 extern struct value *value_full_object (struct value *, struct type *, int,
672 extern struct value *value_cast_pointers (struct type *, struct value *);
674 extern struct value *value_cast (struct type *type, struct value *arg2);
676 extern struct value *value_reinterpret_cast (struct type *type,
679 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
681 extern struct value *value_zero (struct type *type, enum lval_type lv);
683 extern struct value *value_one (struct type *type);
685 extern struct value *value_repeat (struct value *arg1, int count);
687 extern struct value *value_subscript (struct value *array, LONGEST index);
689 extern struct value *value_bitstring_subscript (struct type *type,
690 struct value *bitstring,
693 extern struct value *register_value_being_returned (struct type *valtype,
694 struct regcache *retbuf);
696 extern int value_in (struct value *element, struct value *set);
698 extern int value_bit_index (struct type *type, const gdb_byte *addr,
701 extern int using_struct_return (struct gdbarch *gdbarch,
702 struct value *function,
703 struct type *value_type);
705 extern struct value *evaluate_expression (struct expression *exp);
707 extern struct value *evaluate_type (struct expression *exp);
709 extern struct value *evaluate_subexp (struct type *expect_type,
710 struct expression *exp,
711 int *pos, enum noside noside);
713 extern struct value *evaluate_subexpression_type (struct expression *exp,
716 extern void fetch_subexp_value (struct expression *exp, int *pc,
717 struct value **valp, struct value **resultp,
718 struct value **val_chain);
720 extern char *extract_field_op (struct expression *exp, int *subexp);
722 extern struct value *evaluate_subexp_with_coercion (struct expression *,
725 extern struct value *parse_and_eval (char *exp);
727 extern struct value *parse_to_comma_and_eval (char **expp);
729 extern struct type *parse_and_eval_type (char *p, int length);
731 extern CORE_ADDR parse_and_eval_address (char *exp);
733 extern LONGEST parse_and_eval_long (char *exp);
735 extern void unop_promote (const struct language_defn *language,
736 struct gdbarch *gdbarch,
737 struct value **arg1);
739 extern void binop_promote (const struct language_defn *language,
740 struct gdbarch *gdbarch,
741 struct value **arg1, struct value **arg2);
743 extern struct value *access_value_history (int num);
745 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
746 struct internalvar *var);
748 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
750 extern void set_internalvar (struct internalvar *var, struct value *val);
752 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
754 extern void set_internalvar_string (struct internalvar *var,
757 extern void clear_internalvar (struct internalvar *var);
759 extern void set_internalvar_component (struct internalvar *var,
761 int bitpos, int bitsize,
762 struct value *newvalue);
764 extern struct internalvar *lookup_only_internalvar (const char *name);
766 extern struct internalvar *create_internalvar (const char *name);
768 /* An internalvar can be dynamically computed by supplying a vector of
769 function pointers to perform various operations. */
771 struct internalvar_funcs
773 /* Compute the value of the variable. The DATA argument passed to
774 the function is the same argument that was passed to
775 `create_internalvar_type_lazy'. */
777 struct value *(*make_value) (struct gdbarch *arch,
778 struct internalvar *var,
781 /* Update the agent expression EXPR with bytecode to compute the
782 value. VALUE is the agent value we are updating. The DATA
783 argument passed to this function is the same argument that was
784 passed to `create_internalvar_type_lazy'. If this pointer is
785 NULL, then the internalvar cannot be compiled to an agent
788 void (*compile_to_ax) (struct internalvar *var,
789 struct agent_expr *expr,
790 struct axs_value *value,
793 /* If non-NULL, this is called to destroy DATA. The DATA argument
794 passed to this function is the same argument that was passed to
795 `create_internalvar_type_lazy'. */
797 void (*destroy) (void *data);
800 extern struct internalvar *
801 create_internalvar_type_lazy (const char *name,
802 const struct internalvar_funcs *funcs,
805 /* Compile an internal variable to an agent expression. VAR is the
806 variable to compile; EXPR and VALUE are the agent expression we are
807 updating. This will return 0 if there is no known way to compile
808 VAR, and 1 if VAR was successfully compiled. It may also throw an
809 exception on error. */
811 extern int compile_internalvar_to_ax (struct internalvar *var,
812 struct agent_expr *expr,
813 struct axs_value *value);
815 extern struct internalvar *lookup_internalvar (const char *name);
817 extern int value_equal (struct value *arg1, struct value *arg2);
819 extern int value_equal_contents (struct value *arg1, struct value *arg2);
821 extern int value_less (struct value *arg1, struct value *arg2);
823 extern int value_logical_not (struct value *arg1);
827 extern struct value *value_of_this (const struct language_defn *lang);
829 extern struct value *value_of_this_silent (const struct language_defn *lang);
831 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
833 enum exp_opcode otherop,
836 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
839 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
840 int j, struct type *type, int offset);
842 extern int binop_types_user_defined_p (enum exp_opcode op,
846 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
849 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
851 extern int destructor_name_p (const char *name, struct type *type);
853 extern void value_incref (struct value *val);
855 extern void value_free (struct value *val);
857 extern void free_all_values (void);
859 extern void free_value_chain (struct value *v);
861 extern void release_value (struct value *val);
863 extern void release_value_or_incref (struct value *val);
865 extern int record_latest_value (struct value *val);
867 extern void modify_field (struct type *type, gdb_byte *addr,
868 LONGEST fieldval, int bitpos, int bitsize);
870 extern void type_print (struct type *type, const char *varstring,
871 struct ui_file *stream, int show);
873 extern char *type_to_string (struct type *type);
875 extern gdb_byte *baseclass_addr (struct type *type, int index,
877 struct value **valuep, int *errp);
879 extern void print_longest (struct ui_file *stream, int format,
880 int use_local, LONGEST val);
882 extern void print_floating (const gdb_byte *valaddr, struct type *type,
883 struct ui_file *stream);
885 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
886 struct ui_file *stream);
888 extern void value_print (struct value *val, struct ui_file *stream,
889 const struct value_print_options *options);
891 extern void value_print_array_elements (struct value *val,
892 struct ui_file *stream, int format,
893 enum val_prettyprint pretty);
895 extern struct value *value_release_to_mark (struct value *mark);
897 extern void val_print (struct type *type, const gdb_byte *valaddr,
898 int embedded_offset, CORE_ADDR address,
899 struct ui_file *stream, int recurse,
900 const struct value *val,
901 const struct value_print_options *options,
902 const struct language_defn *language);
904 extern void common_val_print (struct value *val,
905 struct ui_file *stream, int recurse,
906 const struct value_print_options *options,
907 const struct language_defn *language);
909 extern int val_print_string (struct type *elttype, const char *encoding,
910 CORE_ADDR addr, int len,
911 struct ui_file *stream,
912 const struct value_print_options *options);
914 extern void print_variable_and_value (const char *name,
916 struct frame_info *frame,
917 struct ui_file *stream,
920 extern int check_field (struct type *, const char *);
922 extern void typedef_print (struct type *type, struct symbol *news,
923 struct ui_file *stream);
925 extern char *internalvar_name (struct internalvar *var);
927 extern void preserve_values (struct objfile *);
931 extern struct value *value_copy (struct value *);
933 extern struct value *value_non_lval (struct value *);
935 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
939 extern struct value *varying_to_slice (struct value *);
941 extern struct value *value_slice (struct value *, int, int);
943 extern struct value *value_literal_complex (struct value *, struct value *,
946 extern struct value *find_function_in_inferior (const char *,
949 extern struct value *value_allocate_space_in_inferior (int);
951 extern struct value *value_subscripted_rvalue (struct value *array,
952 LONGEST index, int lowerbound);
954 /* User function handler. */
956 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
957 const struct language_defn *language,
960 struct value **argv);
962 void add_internal_function (const char *name, const char *doc,
963 internal_function_fn handler,
966 struct value *call_internal_function (struct gdbarch *gdbarch,
967 const struct language_defn *language,
968 struct value *function,
969 int argc, struct value **argv);
971 char *value_internal_function_name (struct value *);
973 #endif /* !defined (VALUE_H) */