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 /* The structure which defines the type of a value. It should never
37 be possible for a program lval value to survive over a call to the
38 inferior (i.e. to be put into the history list or an internal
43 /* Values are stored in a chain, so that they can be deleted easily
44 over calls to the inferior. Values assigned to internal variables,
45 put into the value history or exposed to Python are taken off this
48 struct value *value_next (struct value *);
50 /* Type of the value. */
52 extern struct type *value_type (const struct value *);
54 /* This is being used to change the type of an existing value, that
55 code should instead be creating a new value with the changed type
56 (but possibly shared content). */
58 extern void deprecated_set_value_type (struct value *value,
61 /* Only used for bitfields; number of bits contained in them. */
63 extern int value_bitsize (const struct value *);
64 extern void set_value_bitsize (struct value *, int bit);
66 /* Only used for bitfields; position of start of field. For
67 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
68 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
70 extern int value_bitpos (const struct value *);
71 extern void set_value_bitpos (struct value *, int bit);
73 /* Only used for bitfields; the containing value. This allows a
74 single read from the target when displaying multiple
77 struct value *value_parent (struct value *);
78 extern void set_value_parent (struct value *value, struct value *parent);
80 /* Describes offset of a value within lval of a structure in bytes.
81 If lval == lval_memory, this is an offset to the address. If lval
82 == lval_register, this is a further offset from location.address
83 within the registers structure. Note also the member
84 embedded_offset below. */
86 extern int value_offset (const struct value *);
87 extern void set_value_offset (struct value *, int offset);
89 /* The comment from "struct value" reads: ``Is it modifiable? Only
90 relevant if lval != not_lval.''. Shouldn't the value instead be
91 not_lval and be done with it? */
93 extern int deprecated_value_modifiable (struct value *value);
95 /* If a value represents a C++ object, then the `type' field gives the
96 object's compile-time type. If the object actually belongs to some
97 class derived from `type', perhaps with other base classes and
98 additional members, then `type' is just a subobject of the real
99 thing, and the full object is probably larger than `type' would
102 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
103 actually determine the object's run-time type by looking at the
104 run-time type information in the vtable. When this information is
105 available, we may elect to read in the entire object, for several
108 - When printing the value, the user would probably rather see the
109 full object, not just the limited portion apparent from the
112 - If `type' has virtual base classes, then even printing `type'
113 alone may require reaching outside the `type' portion of the
114 object to wherever the virtual base class has been stored.
116 When we store the entire object, `enclosing_type' is the run-time
117 type -- the complete object -- and `embedded_offset' is the offset
118 of `type' within that larger type, in bytes. The value_contents()
119 macro takes `embedded_offset' into account, so most GDB code
120 continues to see the `type' portion of the value, just as the
123 If `type' is a pointer to an object, then `enclosing_type' is a
124 pointer to the object's run-time type, and `pointed_to_offset' is
125 the offset in bytes from the full object to the pointed-to object
126 -- that is, the value `embedded_offset' would have if we followed
127 the pointer and fetched the complete object. (I don't really see
128 the point. Why not just determine the run-time type when you
129 indirect, and avoid the special case? The contents don't matter
130 until you indirect anyway.)
132 If we're not doing anything fancy, `enclosing_type' is equal to
133 `type', and `embedded_offset' is zero, so everything works
136 extern struct type *value_enclosing_type (struct value *);
137 extern void set_value_enclosing_type (struct value *val,
138 struct type *new_type);
140 /* Returns value_type or value_enclosing_type depending on
141 value_print_options.objectprint.
143 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
144 only for pointers and references, else it will be returned
145 for all the types (e.g. structures). This option is useful
146 to prevent retrieving enclosing type for the base classes fields.
148 REAL_TYPE_FOUND is used to inform whether the real type was found
149 (or just static type was used). The NULL may be passed if it is not
152 extern struct type *value_actual_type (struct value *value,
153 int resolve_simple_types,
154 int *real_type_found);
156 extern int value_pointed_to_offset (struct value *value);
157 extern void set_value_pointed_to_offset (struct value *value, int val);
158 extern int value_embedded_offset (struct value *value);
159 extern void set_value_embedded_offset (struct value *value, int val);
161 /* For lval_computed values, this structure holds functions used to
162 retrieve and set the value (or portions of the value).
164 For each function, 'V' is the 'this' pointer: an lval_funcs
165 function F may always assume that the V it receives is an
166 lval_computed value, and has F in the appropriate slot of its
167 lval_funcs structure. */
171 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
172 a problem arises in obtaining VALUE's bits, this function should
173 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
174 non-optimized-out value is an internal error. */
175 void (*read) (struct value *v);
177 /* Handle an assignment TOVAL = FROMVAL by writing the value of
178 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
179 been updated. If a problem arises in doing so, this function
180 should call 'error'. If it is NULL such TOVAL assignment is an error as
181 TOVAL is not considered as an lvalue. */
182 void (*write) (struct value *toval, struct value *fromval);
184 /* Check the validity of some bits in VALUE. This should return 1
185 if all the bits starting at OFFSET and extending for LENGTH bits
186 are valid, or 0 if any bit is invalid. */
187 int (*check_validity) (const struct value *value, int offset, int length);
189 /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid. */
190 int (*check_any_valid) (const struct value *value);
192 /* If non-NULL, this is used to implement pointer indirection for
193 this value. This method may return NULL, in which case value_ind
194 will fall back to ordinary indirection. */
195 struct value *(*indirect) (struct value *value);
197 /* If non-NULL, this is used to implement reference resolving for
198 this value. This method may return NULL, in which case coerce_ref
199 will fall back to ordinary references resolving. */
200 struct value *(*coerce_ref) (const struct value *value);
202 /* If non-NULL, this is used to determine whether the indicated bits
203 of VALUE are a synthetic pointer. */
204 int (*check_synthetic_pointer) (const struct value *value,
205 int offset, int length);
207 /* Return a duplicate of VALUE's closure, for use in a new value.
208 This may simply return the same closure, if VALUE's is
209 reference-counted or statically allocated.
211 This may be NULL, in which case VALUE's closure is re-used in the
213 void *(*copy_closure) (const struct value *v);
215 /* Drop VALUE's reference to its closure. Maybe this frees the
216 closure; maybe this decrements a reference count; maybe the
217 closure is statically allocated and this does nothing.
219 This may be NULL, in which case no action is taken to free
221 void (*free_closure) (struct value *v);
224 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
225 and closure CLOSURE. */
227 extern struct value *allocate_computed_value (struct type *type,
228 const struct lval_funcs *funcs,
231 /* Helper function to check the validity of some bits of a value.
233 If TYPE represents some aggregate type (e.g., a structure), return 1.
235 Otherwise, any of the bytes starting at OFFSET and extending for
236 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
237 return 0. The checking is done using FUNCS.
239 Otherwise, return 1. */
241 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
243 const struct value *val);
245 extern struct value *allocate_optimized_out_value (struct type *type);
247 /* If VALUE is lval_computed, return its lval_funcs structure. */
249 extern const struct lval_funcs *value_computed_funcs (const struct value *);
251 /* If VALUE is lval_computed, return its closure. The meaning of the
252 returned value depends on the functions VALUE uses. */
254 extern void *value_computed_closure (const struct value *value);
256 /* If zero, contents of this value are in the contents field. If
257 nonzero, contents are in inferior. If the lval field is lval_memory,
258 the contents are in inferior memory at location.address plus offset.
259 The lval field may also be lval_register.
261 WARNING: This field is used by the code which handles watchpoints
262 (see breakpoint.c) to decide whether a particular value can be
263 watched by hardware watchpoints. If the lazy flag is set for some
264 member of a value chain, it is assumed that this member of the
265 chain doesn't need to be watched as part of watching the value
266 itself. This is how GDB avoids watching the entire struct or array
267 when the user wants to watch a single struct member or array
268 element. If you ever change the way lazy flag is set and reset, be
269 sure to consider this use as well! */
271 extern int value_lazy (struct value *);
272 extern void set_value_lazy (struct value *value, int val);
274 extern int value_stack (struct value *);
275 extern void set_value_stack (struct value *value, int val);
277 /* Throw an error complaining that the value has been optimized
280 extern void error_value_optimized_out (void);
282 /* value_contents() and value_contents_raw() both return the address
283 of the gdb buffer used to hold a copy of the contents of the lval.
284 value_contents() is used when the contents of the buffer are needed
285 -- it uses value_fetch_lazy() to load the buffer from the process
286 being debugged if it hasn't already been loaded
287 (value_contents_writeable() is used when a writeable but fetched
288 buffer is required).. value_contents_raw() is used when data is
289 being stored into the buffer, or when it is certain that the
290 contents of the buffer are valid.
292 Note: The contents pointer is adjusted by the offset required to
293 get to the real subobject, if the value happens to represent
294 something embedded in a larger run-time object. */
296 extern gdb_byte *value_contents_raw (struct value *);
298 /* Actual contents of the value. For use of this value; setting it
299 uses the stuff above. Not valid if lazy is nonzero. Target
300 byte-order. We force it to be aligned properly for any possible
301 value. Note that a value therefore extends beyond what is
304 extern const gdb_byte *value_contents (struct value *);
305 extern gdb_byte *value_contents_writeable (struct value *);
307 /* The ALL variants of the above two macros do not adjust the returned
308 pointer by the embedded_offset value. */
310 extern gdb_byte *value_contents_all_raw (struct value *);
311 extern const gdb_byte *value_contents_all (struct value *);
313 /* Like value_contents_all, but does not require that the returned
314 bits be valid. This should only be used in situations where you
315 plan to check the validity manually. */
316 extern const gdb_byte *value_contents_for_printing (struct value *value);
318 /* Like value_contents_for_printing, but accepts a constant value
319 pointer. Unlike value_contents_for_printing however, the pointed
320 value must _not_ be lazy. */
321 extern const gdb_byte *
322 value_contents_for_printing_const (const struct value *value);
324 extern int value_fetch_lazy (struct value *val);
325 extern int value_contents_equal (struct value *val1, struct value *val2);
327 /* If nonzero, this is the value of a variable which does not actually
328 exist in the program, at least partially. If the value is lazy,
329 this may fetch it now. */
330 extern int value_optimized_out (struct value *value);
331 extern void set_value_optimized_out (struct value *value, int val);
333 /* Like value_optimized_out, but don't fetch the value even if it is
334 lazy. Mainly useful for constructing other values using VALUE as
336 extern int value_optimized_out_const (const struct value *value);
338 /* Like value_optimized_out, but return false if any bit in the object
340 extern int value_entirely_optimized_out (const struct value *value);
342 /* Set or return field indicating whether a variable is initialized or
343 not, based on debugging information supplied by the compiler.
344 1 = initialized; 0 = uninitialized. */
345 extern int value_initialized (struct value *);
346 extern void set_value_initialized (struct value *, int);
348 /* Set COMPONENT's location as appropriate for a component of WHOLE
349 --- regardless of what kind of lvalue WHOLE is. */
350 extern void set_value_component_location (struct value *component,
351 const struct value *whole);
353 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
354 single value might have multiple LVALs), this hacked interface is
355 limited to just the first PIECE. Expect further change. */
356 /* Type of value; either not an lval, or one of the various different
357 possible kinds of lval. */
358 extern enum lval_type *deprecated_value_lval_hack (struct value *);
359 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
361 /* Like VALUE_LVAL, except the parameter can be const. */
362 extern enum lval_type value_lval_const (const struct value *value);
364 /* If lval == lval_memory, return the address in the inferior. If
365 lval == lval_register, return the byte offset into the registers
366 structure. Otherwise, return 0. The returned address
367 includes the offset, if any. */
368 extern CORE_ADDR value_address (const struct value *);
370 /* Like value_address, except the result does not include value's
372 extern CORE_ADDR value_raw_address (struct value *);
374 /* Set the address of a value. */
375 extern void set_value_address (struct value *, CORE_ADDR);
377 /* Pointer to internal variable. */
378 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
379 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
381 /* Frame register value is relative to. This will be described in the
382 lval enum above as "lval_register". */
383 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
384 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
386 /* Register number if the value is from a register. */
387 extern short *deprecated_value_regnum_hack (struct value *);
388 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
390 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
391 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
393 extern struct value *coerce_ref_if_computed (const struct value *arg);
395 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
396 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
397 ORIGINAL_VAL are the type and value of the original reference or pointer.
399 Note, that VALUE is modified by this function.
401 It is a common implementation for coerce_ref and value_ind. */
403 extern struct value * readjust_indirect_value_type (struct value *value,
404 struct type *enc_type,
405 struct type *original_type,
406 struct value *original_val);
408 /* Convert a REF to the object referenced. */
410 extern struct value *coerce_ref (struct value *value);
412 /* If ARG is an array, convert it to a pointer.
413 If ARG is a function, convert it to a function pointer.
415 References are dereferenced. */
417 extern struct value *coerce_array (struct value *value);
419 /* Given a value, determine whether the bits starting at OFFSET and
420 extending for LENGTH bits are valid. This returns nonzero if all
421 bits in the given range are valid, zero if any bit is invalid. */
423 extern int value_bits_valid (const struct value *value,
424 int offset, int length);
426 /* Given a value, determine whether the bits starting at OFFSET and
427 extending for LENGTH bits are a synthetic pointer. */
429 extern int value_bits_synthetic_pointer (const struct value *value,
430 int offset, int length);
432 /* Given a value, determine whether the contents bytes starting at
433 OFFSET and extending for LENGTH bytes are available. This returns
434 nonzero if all bytes in the given range are available, zero if any
435 byte is unavailable. */
437 extern int value_bytes_available (const struct value *value,
438 int offset, int length);
440 /* Given a value, determine whether the contents bits starting at
441 OFFSET and extending for LENGTH bits are available. This returns
442 nonzero if all bits in the given range are available, zero if any
443 bit is unavailable. */
445 extern int value_bits_available (const struct value *value,
446 int offset, int length);
448 /* Like value_bytes_available, but return false if any byte in the
449 whole object is unavailable. */
450 extern int value_entirely_available (struct value *value);
452 /* Like value_entirely_available, but return false if any byte in the
453 whole object is available. */
454 extern int value_entirely_unavailable (struct value *value);
456 /* Mark VALUE's content bytes starting at OFFSET and extending for
457 LENGTH bytes as unavailable. */
459 extern void mark_value_bytes_unavailable (struct value *value,
460 int offset, int length);
462 /* Mark VALUE's content bits starting at OFFSET and extending for
463 LENGTH bits as unavailable. */
465 extern void mark_value_bits_unavailable (struct value *value,
466 int offset, int length);
468 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
469 LENGTH bytes of VAL2's contents starting at OFFSET2.
471 Note that "contents" refers to the whole value's contents
472 (value_contents_all), without any embedded offset adjustment. For
473 example, to compare a complete object value with itself, including
474 its enclosing type chunk, you'd do:
476 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
477 value_available_contents (val, 0, val, 0, len);
479 Returns true iff the set of available contents match. Unavailable
480 contents compare equal with unavailable contents, and different
481 with any available byte. For example, if 'x's represent an
482 unavailable byte, and 'V' and 'Z' represent different available
483 bytes, in a value with length 16:
486 contents: xxxxVVVVxxxxVVZZ
490 value_available_contents_eq(val, 0, val, 8, 6) => 1
491 value_available_contents_eq(val, 0, val, 4, 4) => 1
492 value_available_contents_eq(val, 0, val, 8, 8) => 0
493 value_available_contents_eq(val, 4, val, 12, 2) => 1
494 value_available_contents_eq(val, 4, val, 12, 4) => 0
495 value_available_contents_eq(val, 3, val, 4, 4) => 0
497 We only know whether a value chunk is available if we've tried to
498 read it. As this routine is used by printing routines, which may
499 be printing values in the value history, long after the inferior is
500 gone, it works with const values. Therefore, this routine must not
501 be called with lazy values. */
503 extern int value_available_contents_eq (const struct value *val1, int offset1,
504 const struct value *val2, int offset2,
507 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
508 is (or will be copied to) VAL's contents buffer offset by
509 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
510 Marks value contents ranges as unavailable if the corresponding
511 memory is likewise unavailable. STACK indicates whether the memory
512 is known to be stack memory. */
514 extern void read_value_memory (struct value *val, int embedded_offset,
515 int stack, CORE_ADDR memaddr,
516 gdb_byte *buffer, size_t length);
518 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
519 into each element of a new vector value with VECTOR_TYPE. */
521 struct value *value_vector_widen (struct value *scalar_value,
522 struct type *vector_type);
527 #include "gdbtypes.h"
528 #include "expression.h"
533 extern int print_address_demangle (const struct value_print_options *,
534 struct gdbarch *, CORE_ADDR,
535 struct ui_file *, int);
537 extern LONGEST value_as_long (struct value *val);
538 extern DOUBLEST value_as_double (struct value *val);
539 extern CORE_ADDR value_as_address (struct value *val);
541 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
542 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
544 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
546 extern int unpack_value_bits_as_long (struct type *field_type,
547 const gdb_byte *valaddr,
548 int embedded_offset, int bitpos,
550 const struct value *original_value,
553 extern LONGEST unpack_field_as_long (struct type *type,
554 const gdb_byte *valaddr,
556 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
557 int embedded_offset, int fieldno,
558 const struct value *val, LONGEST *result);
560 extern struct value *value_field_bitfield (struct type *type, int fieldno,
561 const gdb_byte *valaddr,
563 const struct value *val);
565 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
567 extern struct value *value_from_longest (struct type *type, LONGEST num);
568 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
569 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
570 extern struct value *value_from_double (struct type *type, DOUBLEST num);
571 extern struct value *value_from_decfloat (struct type *type,
572 const gdb_byte *decbytes);
573 extern struct value *value_from_history_ref (char *, char **);
575 extern struct value *value_at (struct type *type, CORE_ADDR addr);
576 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
578 extern struct value *value_from_contents_and_address_unresolved
579 (struct type *, const gdb_byte *, CORE_ADDR);
580 extern struct value *value_from_contents_and_address (struct type *,
583 extern struct value *value_from_contents (struct type *, const gdb_byte *);
585 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
588 struct frame_id frame_id);
590 extern void read_frame_register_value (struct value *value,
591 struct frame_info *frame);
593 extern struct value *value_from_register (struct type *type, int regnum,
594 struct frame_info *frame);
596 extern CORE_ADDR address_from_register (int regnum,
597 struct frame_info *frame);
599 extern struct value *value_of_variable (struct symbol *var,
600 const struct block *b);
602 extern struct value *address_of_variable (struct symbol *var,
603 const struct block *b);
605 extern struct value *value_of_register (int regnum, struct frame_info *frame);
607 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
609 extern int symbol_read_needs_frame (struct symbol *);
611 extern struct value *read_var_value (struct symbol *var,
612 struct frame_info *frame);
614 extern struct value *default_read_var_value (struct symbol *var,
615 struct frame_info *frame);
617 extern struct value *allocate_value (struct type *type);
618 extern struct value *allocate_value_lazy (struct type *type);
619 extern void value_contents_copy (struct value *dst, int dst_offset,
620 struct value *src, int src_offset,
622 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
623 struct value *src, int src_offset,
626 extern struct value *allocate_repeat_value (struct type *type, int count);
628 extern struct value *value_mark (void);
630 extern void value_free_to_mark (struct value *mark);
632 extern struct value *value_cstring (char *ptr, ssize_t len,
633 struct type *char_type);
634 extern struct value *value_string (char *ptr, ssize_t len,
635 struct type *char_type);
637 extern struct value *value_array (int lowbound, int highbound,
638 struct value **elemvec);
640 extern struct value *value_concat (struct value *arg1, struct value *arg2);
642 extern struct value *value_binop (struct value *arg1, struct value *arg2,
645 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
647 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
649 extern int value_must_coerce_to_target (struct value *arg1);
651 extern struct value *value_coerce_to_target (struct value *arg1);
653 extern struct value *value_coerce_array (struct value *arg1);
655 extern struct value *value_coerce_function (struct value *arg1);
657 extern struct value *value_ind (struct value *arg1);
659 extern struct value *value_addr (struct value *arg1);
661 extern struct value *value_ref (struct value *arg1);
663 extern struct value *value_assign (struct value *toval,
664 struct value *fromval);
666 extern struct value *value_pos (struct value *arg1);
668 extern struct value *value_neg (struct value *arg1);
670 extern struct value *value_complement (struct value *arg1);
672 extern struct value *value_struct_elt (struct value **argp,
674 const char *name, int *static_memfuncp,
677 extern struct value *value_struct_elt_bitpos (struct value **argp,
679 struct type *field_type,
682 extern struct value *value_aggregate_elt (struct type *curtype,
684 struct type *expect_type,
688 extern struct value *value_static_field (struct type *type, int fieldno);
690 enum oload_search_type { NON_METHOD, METHOD, BOTH };
692 extern int find_overload_match (struct value **args, int nargs,
694 enum oload_search_type method,
695 struct value **objp, struct symbol *fsym,
696 struct value **valp, struct symbol **symp,
697 int *staticp, const int no_adl);
699 extern struct value *value_field (struct value *arg1, int fieldno);
701 extern struct value *value_primitive_field (struct value *arg1, int offset,
703 struct type *arg_type);
706 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
709 extern struct value *value_full_object (struct value *, struct type *, int,
712 extern struct value *value_cast_pointers (struct type *, struct value *, int);
714 extern struct value *value_cast (struct type *type, struct value *arg2);
716 extern struct value *value_reinterpret_cast (struct type *type,
719 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
721 extern struct value *value_zero (struct type *type, enum lval_type lv);
723 extern struct value *value_one (struct type *type);
725 extern struct value *value_repeat (struct value *arg1, int count);
727 extern struct value *value_subscript (struct value *array, LONGEST index);
729 extern struct value *value_bitstring_subscript (struct type *type,
730 struct value *bitstring,
733 extern struct value *register_value_being_returned (struct type *valtype,
734 struct regcache *retbuf);
736 extern int value_in (struct value *element, struct value *set);
738 extern int value_bit_index (struct type *type, const gdb_byte *addr,
741 extern enum return_value_convention
742 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
743 struct type *value_type);
745 extern int using_struct_return (struct gdbarch *gdbarch,
746 struct value *function,
747 struct type *value_type);
749 extern struct value *evaluate_expression (struct expression *exp);
751 extern struct value *evaluate_type (struct expression *exp);
753 extern struct value *evaluate_subexp (struct type *expect_type,
754 struct expression *exp,
755 int *pos, enum noside noside);
757 extern struct value *evaluate_subexpression_type (struct expression *exp,
760 extern void fetch_subexp_value (struct expression *exp, int *pc,
761 struct value **valp, struct value **resultp,
762 struct value **val_chain,
763 int preserve_errors);
765 extern char *extract_field_op (struct expression *exp, int *subexp);
767 extern struct value *evaluate_subexp_with_coercion (struct expression *,
770 extern struct value *parse_and_eval (const char *exp);
772 extern struct value *parse_to_comma_and_eval (const char **expp);
774 extern struct type *parse_and_eval_type (char *p, int length);
776 extern CORE_ADDR parse_and_eval_address (const char *exp);
778 extern LONGEST parse_and_eval_long (const char *exp);
780 extern void unop_promote (const struct language_defn *language,
781 struct gdbarch *gdbarch,
782 struct value **arg1);
784 extern void binop_promote (const struct language_defn *language,
785 struct gdbarch *gdbarch,
786 struct value **arg1, struct value **arg2);
788 extern struct value *access_value_history (int num);
790 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
791 struct internalvar *var);
793 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
795 extern void set_internalvar (struct internalvar *var, struct value *val);
797 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
799 extern void set_internalvar_string (struct internalvar *var,
802 extern void clear_internalvar (struct internalvar *var);
804 extern void set_internalvar_component (struct internalvar *var,
806 int bitpos, int bitsize,
807 struct value *newvalue);
809 extern struct internalvar *lookup_only_internalvar (const char *name);
811 extern struct internalvar *create_internalvar (const char *name);
813 extern VEC (char_ptr) *complete_internalvar (const char *name);
815 /* An internalvar can be dynamically computed by supplying a vector of
816 function pointers to perform various operations. */
818 struct internalvar_funcs
820 /* Compute the value of the variable. The DATA argument passed to
821 the function is the same argument that was passed to
822 `create_internalvar_type_lazy'. */
824 struct value *(*make_value) (struct gdbarch *arch,
825 struct internalvar *var,
828 /* Update the agent expression EXPR with bytecode to compute the
829 value. VALUE is the agent value we are updating. The DATA
830 argument passed to this function is the same argument that was
831 passed to `create_internalvar_type_lazy'. If this pointer is
832 NULL, then the internalvar cannot be compiled to an agent
835 void (*compile_to_ax) (struct internalvar *var,
836 struct agent_expr *expr,
837 struct axs_value *value,
840 /* If non-NULL, this is called to destroy DATA. The DATA argument
841 passed to this function is the same argument that was passed to
842 `create_internalvar_type_lazy'. */
844 void (*destroy) (void *data);
847 extern struct internalvar *create_internalvar_type_lazy (const char *name,
848 const struct internalvar_funcs *funcs,
851 /* Compile an internal variable to an agent expression. VAR is the
852 variable to compile; EXPR and VALUE are the agent expression we are
853 updating. This will return 0 if there is no known way to compile
854 VAR, and 1 if VAR was successfully compiled. It may also throw an
855 exception on error. */
857 extern int compile_internalvar_to_ax (struct internalvar *var,
858 struct agent_expr *expr,
859 struct axs_value *value);
861 extern struct internalvar *lookup_internalvar (const char *name);
863 extern int value_equal (struct value *arg1, struct value *arg2);
865 extern int value_equal_contents (struct value *arg1, struct value *arg2);
867 extern int value_less (struct value *arg1, struct value *arg2);
869 extern int value_logical_not (struct value *arg1);
873 extern struct value *value_of_this (const struct language_defn *lang);
875 extern struct value *value_of_this_silent (const struct language_defn *lang);
877 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
879 enum exp_opcode otherop,
882 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
885 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
886 int j, struct type *type, int offset);
888 extern int binop_types_user_defined_p (enum exp_opcode op,
892 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
895 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
897 extern int destructor_name_p (const char *name, struct type *type);
899 extern void value_incref (struct value *val);
901 extern void value_free (struct value *val);
903 extern void free_all_values (void);
905 extern void free_value_chain (struct value *v);
907 extern void release_value (struct value *val);
909 extern void release_value_or_incref (struct value *val);
911 extern int record_latest_value (struct value *val);
913 extern void modify_field (struct type *type, gdb_byte *addr,
914 LONGEST fieldval, int bitpos, int bitsize);
916 extern void type_print (struct type *type, const char *varstring,
917 struct ui_file *stream, int show);
919 extern char *type_to_string (struct type *type);
921 extern gdb_byte *baseclass_addr (struct type *type, int index,
923 struct value **valuep, int *errp);
925 extern void print_longest (struct ui_file *stream, int format,
926 int use_local, LONGEST val);
928 extern void print_floating (const gdb_byte *valaddr, struct type *type,
929 struct ui_file *stream);
931 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
932 struct ui_file *stream);
934 extern void value_print (struct value *val, struct ui_file *stream,
935 const struct value_print_options *options);
937 extern void value_print_array_elements (struct value *val,
938 struct ui_file *stream, int format,
939 enum val_prettyformat pretty);
941 extern struct value *value_release_to_mark (struct value *mark);
943 extern void val_print (struct type *type, const gdb_byte *valaddr,
944 int embedded_offset, CORE_ADDR address,
945 struct ui_file *stream, int recurse,
946 const struct value *val,
947 const struct value_print_options *options,
948 const struct language_defn *language);
950 extern void common_val_print (struct value *val,
951 struct ui_file *stream, int recurse,
952 const struct value_print_options *options,
953 const struct language_defn *language);
955 extern int val_print_string (struct type *elttype, const char *encoding,
956 CORE_ADDR addr, int len,
957 struct ui_file *stream,
958 const struct value_print_options *options);
960 extern void print_variable_and_value (const char *name,
962 struct frame_info *frame,
963 struct ui_file *stream,
966 extern void typedef_print (struct type *type, struct symbol *news,
967 struct ui_file *stream);
969 extern char *internalvar_name (struct internalvar *var);
971 extern void preserve_values (struct objfile *);
975 extern struct value *value_copy (struct value *);
977 extern struct value *value_non_lval (struct value *);
979 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
983 extern struct value *varying_to_slice (struct value *);
985 extern struct value *value_slice (struct value *, int, int);
987 extern struct value *value_literal_complex (struct value *, struct value *,
990 extern struct value *find_function_in_inferior (const char *,
993 extern struct value *value_allocate_space_in_inferior (int);
995 extern struct value *value_subscripted_rvalue (struct value *array,
996 LONGEST index, int lowerbound);
998 /* User function handler. */
1000 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
1001 const struct language_defn *language,
1004 struct value **argv);
1006 void add_internal_function (const char *name, const char *doc,
1007 internal_function_fn handler,
1010 struct value *call_internal_function (struct gdbarch *gdbarch,
1011 const struct language_defn *language,
1012 struct value *function,
1013 int argc, struct value **argv);
1015 char *value_internal_function_name (struct value *);
1017 extern struct value *value_of_xmethod (struct xmethod_worker *);
1019 struct value *call_xmethod (struct value *function,
1020 int argc, struct value **argv);
1022 #endif /* !defined (VALUE_H) */