1 /* Definitions for values of C expressions, for GDB.
3 Copyright (C) 1986-2015 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 /* Return the gdbarch associated with the value. */
104 extern struct gdbarch *get_value_arch (const struct value *value);
106 /* This is being used to change the type of an existing value, that
107 code should instead be creating a new value with the changed type
108 (but possibly shared content). */
110 extern void deprecated_set_value_type (struct value *value,
113 /* Only used for bitfields; number of bits contained in them. */
115 extern int value_bitsize (const struct value *);
116 extern void set_value_bitsize (struct value *, int bit);
118 /* Only used for bitfields; position of start of field. For
119 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
120 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
122 extern int value_bitpos (const struct value *);
123 extern void set_value_bitpos (struct value *, int bit);
125 /* Only used for bitfields; the containing value. This allows a
126 single read from the target when displaying multiple
129 struct value *value_parent (struct value *);
130 extern void set_value_parent (struct value *value, struct value *parent);
132 /* Describes offset of a value within lval of a structure in bytes.
133 If lval == lval_memory, this is an offset to the address. If lval
134 == lval_register, this is a further offset from location.address
135 within the registers structure. Note also the member
136 embedded_offset below. */
138 extern int value_offset (const struct value *);
139 extern void set_value_offset (struct value *, int offset);
141 /* The comment from "struct value" reads: ``Is it modifiable? Only
142 relevant if lval != not_lval.''. Shouldn't the value instead be
143 not_lval and be done with it? */
145 extern int deprecated_value_modifiable (struct value *value);
147 /* If a value represents a C++ object, then the `type' field gives the
148 object's compile-time type. If the object actually belongs to some
149 class derived from `type', perhaps with other base classes and
150 additional members, then `type' is just a subobject of the real
151 thing, and the full object is probably larger than `type' would
154 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
155 actually determine the object's run-time type by looking at the
156 run-time type information in the vtable. When this information is
157 available, we may elect to read in the entire object, for several
160 - When printing the value, the user would probably rather see the
161 full object, not just the limited portion apparent from the
164 - If `type' has virtual base classes, then even printing `type'
165 alone may require reaching outside the `type' portion of the
166 object to wherever the virtual base class has been stored.
168 When we store the entire object, `enclosing_type' is the run-time
169 type -- the complete object -- and `embedded_offset' is the offset
170 of `type' within that larger type, in bytes. The value_contents()
171 macro takes `embedded_offset' into account, so most GDB code
172 continues to see the `type' portion of the value, just as the
175 If `type' is a pointer to an object, then `enclosing_type' is a
176 pointer to the object's run-time type, and `pointed_to_offset' is
177 the offset in bytes from the full object to the pointed-to object
178 -- that is, the value `embedded_offset' would have if we followed
179 the pointer and fetched the complete object. (I don't really see
180 the point. Why not just determine the run-time type when you
181 indirect, and avoid the special case? The contents don't matter
182 until you indirect anyway.)
184 If we're not doing anything fancy, `enclosing_type' is equal to
185 `type', and `embedded_offset' is zero, so everything works
188 extern struct type *value_enclosing_type (struct value *);
189 extern void set_value_enclosing_type (struct value *val,
190 struct type *new_type);
192 /* Returns value_type or value_enclosing_type depending on
193 value_print_options.objectprint.
195 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
196 only for pointers and references, else it will be returned
197 for all the types (e.g. structures). This option is useful
198 to prevent retrieving enclosing type for the base classes fields.
200 REAL_TYPE_FOUND is used to inform whether the real type was found
201 (or just static type was used). The NULL may be passed if it is not
204 extern struct type *value_actual_type (struct value *value,
205 int resolve_simple_types,
206 int *real_type_found);
208 extern int value_pointed_to_offset (struct value *value);
209 extern void set_value_pointed_to_offset (struct value *value, int val);
210 extern int value_embedded_offset (struct value *value);
211 extern void set_value_embedded_offset (struct value *value, int val);
213 /* For lval_computed values, this structure holds functions used to
214 retrieve and set the value (or portions of the value).
216 For each function, 'V' is the 'this' pointer: an lval_funcs
217 function F may always assume that the V it receives is an
218 lval_computed value, and has F in the appropriate slot of its
219 lval_funcs structure. */
223 /* Fill in VALUE's contents. This is used to "un-lazy" values. If
224 a problem arises in obtaining VALUE's bits, this function should
225 call 'error'. If it is NULL value_fetch_lazy on "un-lazy"
226 non-optimized-out value is an internal error. */
227 void (*read) (struct value *v);
229 /* Handle an assignment TOVAL = FROMVAL by writing the value of
230 FROMVAL to TOVAL's location. The contents of TOVAL have not yet
231 been updated. If a problem arises in doing so, this function
232 should call 'error'. If it is NULL such TOVAL assignment is an error as
233 TOVAL is not considered as an lvalue. */
234 void (*write) (struct value *toval, struct value *fromval);
236 /* If non-NULL, this is used to implement pointer indirection for
237 this value. This method may return NULL, in which case value_ind
238 will fall back to ordinary indirection. */
239 struct value *(*indirect) (struct value *value);
241 /* If non-NULL, this is used to implement reference resolving for
242 this value. This method may return NULL, in which case coerce_ref
243 will fall back to ordinary references resolving. */
244 struct value *(*coerce_ref) (const struct value *value);
246 /* If non-NULL, this is used to determine whether the indicated bits
247 of VALUE are a synthetic pointer. */
248 int (*check_synthetic_pointer) (const struct value *value,
249 int offset, int length);
251 /* Return a duplicate of VALUE's closure, for use in a new value.
252 This may simply return the same closure, if VALUE's is
253 reference-counted or statically allocated.
255 This may be NULL, in which case VALUE's closure is re-used in the
257 void *(*copy_closure) (const struct value *v);
259 /* Drop VALUE's reference to its closure. Maybe this frees the
260 closure; maybe this decrements a reference count; maybe the
261 closure is statically allocated and this does nothing.
263 This may be NULL, in which case no action is taken to free
265 void (*free_closure) (struct value *v);
268 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
269 and closure CLOSURE. */
271 extern struct value *allocate_computed_value (struct type *type,
272 const struct lval_funcs *funcs,
275 /* Helper function to check the validity of some bits of a value.
277 If TYPE represents some aggregate type (e.g., a structure), return 1.
279 Otherwise, any of the bytes starting at OFFSET and extending for
280 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
281 return 0. The checking is done using FUNCS.
283 Otherwise, return 1. */
285 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
287 const struct value *val);
289 extern struct value *allocate_optimized_out_value (struct type *type);
291 /* If VALUE is lval_computed, return its lval_funcs structure. */
293 extern const struct lval_funcs *value_computed_funcs (const struct value *);
295 /* If VALUE is lval_computed, return its closure. The meaning of the
296 returned value depends on the functions VALUE uses. */
298 extern void *value_computed_closure (const struct value *value);
300 /* If zero, contents of this value are in the contents field. If
301 nonzero, contents are in inferior. If the lval field is lval_memory,
302 the contents are in inferior memory at location.address plus offset.
303 The lval field may also be lval_register.
305 WARNING: This field is used by the code which handles watchpoints
306 (see breakpoint.c) to decide whether a particular value can be
307 watched by hardware watchpoints. If the lazy flag is set for some
308 member of a value chain, it is assumed that this member of the
309 chain doesn't need to be watched as part of watching the value
310 itself. This is how GDB avoids watching the entire struct or array
311 when the user wants to watch a single struct member or array
312 element. If you ever change the way lazy flag is set and reset, be
313 sure to consider this use as well! */
315 extern int value_lazy (struct value *);
316 extern void set_value_lazy (struct value *value, int val);
318 extern int value_stack (struct value *);
319 extern void set_value_stack (struct value *value, int val);
321 /* Throw an error complaining that the value has been optimized
324 extern void error_value_optimized_out (void);
326 /* value_contents() and value_contents_raw() both return the address
327 of the gdb buffer used to hold a copy of the contents of the lval.
328 value_contents() is used when the contents of the buffer are needed
329 -- it uses value_fetch_lazy() to load the buffer from the process
330 being debugged if it hasn't already been loaded
331 (value_contents_writeable() is used when a writeable but fetched
332 buffer is required).. value_contents_raw() is used when data is
333 being stored into the buffer, or when it is certain that the
334 contents of the buffer are valid.
336 Note: The contents pointer is adjusted by the offset required to
337 get to the real subobject, if the value happens to represent
338 something embedded in a larger run-time object. */
340 extern gdb_byte *value_contents_raw (struct value *);
342 /* Actual contents of the value. For use of this value; setting it
343 uses the stuff above. Not valid if lazy is nonzero. Target
344 byte-order. We force it to be aligned properly for any possible
345 value. Note that a value therefore extends beyond what is
348 extern const gdb_byte *value_contents (struct value *);
349 extern gdb_byte *value_contents_writeable (struct value *);
351 /* The ALL variants of the above two macros do not adjust the returned
352 pointer by the embedded_offset value. */
354 extern gdb_byte *value_contents_all_raw (struct value *);
355 extern const gdb_byte *value_contents_all (struct value *);
357 /* Like value_contents_all, but does not require that the returned
358 bits be valid. This should only be used in situations where you
359 plan to check the validity manually. */
360 extern const gdb_byte *value_contents_for_printing (struct value *value);
362 /* Like value_contents_for_printing, but accepts a constant value
363 pointer. Unlike value_contents_for_printing however, the pointed
364 value must _not_ be lazy. */
365 extern const gdb_byte *
366 value_contents_for_printing_const (const struct value *value);
368 extern void value_fetch_lazy (struct value *val);
370 /* If nonzero, this is the value of a variable which does not actually
371 exist in the program, at least partially. If the value is lazy,
372 this may fetch it now. */
373 extern int value_optimized_out (struct value *value);
375 /* Given a value, return true if any of the contents bits starting at
376 OFFSET and extending for LENGTH bits is optimized out, false
379 extern int value_bits_any_optimized_out (const struct value *value,
380 int bit_offset, int bit_length);
382 /* Like value_optimized_out, but return true iff the whole value is
384 extern int value_entirely_optimized_out (struct value *value);
386 /* Mark VALUE's content bytes starting at OFFSET and extending for
387 LENGTH bytes as optimized out. */
389 extern void mark_value_bytes_optimized_out (struct value *value,
390 int offset, int length);
392 /* Mark VALUE's content bits starting at OFFSET and extending for
393 LENGTH bits as optimized out. */
395 extern void mark_value_bits_optimized_out (struct value *value,
396 int offset, int length);
398 /* Set or return field indicating whether a variable is initialized or
399 not, based on debugging information supplied by the compiler.
400 1 = initialized; 0 = uninitialized. */
401 extern int value_initialized (struct value *);
402 extern void set_value_initialized (struct value *, int);
404 /* Set COMPONENT's location as appropriate for a component of WHOLE
405 --- regardless of what kind of lvalue WHOLE is. */
406 extern void set_value_component_location (struct value *component,
407 const struct value *whole);
409 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
410 single value might have multiple LVALs), this hacked interface is
411 limited to just the first PIECE. Expect further change. */
412 /* Type of value; either not an lval, or one of the various different
413 possible kinds of lval. */
414 extern enum lval_type *deprecated_value_lval_hack (struct value *);
415 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
417 /* Like VALUE_LVAL, except the parameter can be const. */
418 extern enum lval_type value_lval_const (const struct value *value);
420 /* If lval == lval_memory, return the address in the inferior. If
421 lval == lval_register, return the byte offset into the registers
422 structure. Otherwise, return 0. The returned address
423 includes the offset, if any. */
424 extern CORE_ADDR value_address (const struct value *);
426 /* Like value_address, except the result does not include value's
428 extern CORE_ADDR value_raw_address (struct value *);
430 /* Set the address of a value. */
431 extern void set_value_address (struct value *, CORE_ADDR);
433 /* Pointer to internal variable. */
434 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
435 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
437 /* Frame register value is relative to. This will be described in the
438 lval enum above as "lval_register". */
439 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
440 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
442 /* Register number if the value is from a register. */
443 extern short *deprecated_value_regnum_hack (struct value *);
444 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
446 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return
447 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */
449 extern struct value *coerce_ref_if_computed (const struct value *arg);
451 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
452 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
453 ORIGINAL_VAL are the type and value of the original reference or pointer.
455 Note, that VALUE is modified by this function.
457 It is a common implementation for coerce_ref and value_ind. */
459 extern struct value * readjust_indirect_value_type (struct value *value,
460 struct type *enc_type,
461 struct type *original_type,
462 struct value *original_val);
464 /* Convert a REF to the object referenced. */
466 extern struct value *coerce_ref (struct value *value);
468 /* If ARG is an array, convert it to a pointer.
469 If ARG is a function, convert it to a function pointer.
471 References are dereferenced. */
473 extern struct value *coerce_array (struct value *value);
475 /* Given a value, determine whether the bits starting at OFFSET and
476 extending for LENGTH bits are a synthetic pointer. */
478 extern int value_bits_synthetic_pointer (const struct value *value,
479 int offset, int length);
481 /* Given a value, determine whether the contents bytes starting at
482 OFFSET and extending for LENGTH bytes are available. This returns
483 nonzero if all bytes in the given range are available, zero if any
484 byte is unavailable. */
486 extern int value_bytes_available (const struct value *value,
487 int offset, int length);
489 /* Given a value, determine whether the contents bits starting at
490 OFFSET and extending for LENGTH bits are available. This returns
491 nonzero if all bits in the given range are available, zero if any
492 bit is unavailable. */
494 extern int value_bits_available (const struct value *value,
495 int offset, int length);
497 /* Like value_bytes_available, but return false if any byte in the
498 whole object is unavailable. */
499 extern int value_entirely_available (struct value *value);
501 /* Like value_entirely_available, but return false if any byte in the
502 whole object is available. */
503 extern int value_entirely_unavailable (struct value *value);
505 /* Mark VALUE's content bytes starting at OFFSET and extending for
506 LENGTH bytes as unavailable. */
508 extern void mark_value_bytes_unavailable (struct value *value,
509 int offset, int length);
511 /* Mark VALUE's content bits starting at OFFSET and extending for
512 LENGTH bits as unavailable. */
514 extern void mark_value_bits_unavailable (struct value *value,
515 int offset, int length);
517 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
518 LENGTH bytes of VAL2's contents starting at OFFSET2.
520 Note that "contents" refers to the whole value's contents
521 (value_contents_all), without any embedded offset adjustment. For
522 example, to compare a complete object value with itself, including
523 its enclosing type chunk, you'd do:
525 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
526 value_contents_eq (val, 0, val, 0, len);
528 Returns true iff the set of available/valid contents match.
530 Optimized-out contents are equal to optimized-out contents, and are
531 not equal to non-optimized-out contents.
533 Unavailable contente are equal to unavailable contents, and are not
534 equal to non-unavailable contents.
536 For example, if 'x's represent an unavailable byte, and 'V' and 'Z'
537 represent different available/valid bytes, in a value with length
541 contents: xxxxVVVVxxxxVVZZ
545 value_contents_eq(val, 0, val, 8, 6) => 1
546 value_contents_eq(val, 0, val, 4, 4) => 0
547 value_contents_eq(val, 0, val, 8, 8) => 0
548 value_contents_eq(val, 4, val, 12, 2) => 1
549 value_contents_eq(val, 4, val, 12, 4) => 0
550 value_contents_eq(val, 3, val, 4, 4) => 0
552 If 'x's represent an unavailable byte, 'o' represents an optimized
553 out byte, in a value with length 8:
560 value_contents_eq(val, 0, val, 2, 2) => 1
561 value_contents_eq(val, 4, val, 6, 2) => 1
562 value_contents_eq(val, 0, val, 4, 4) => 0
564 We only know whether a value chunk is unavailable or optimized out
565 if we've tried to read it. As this routine is used by printing
566 routines, which may be printing values in the value history, long
567 after the inferior is gone, it works with const values. Therefore,
568 this routine must not be called with lazy values. */
570 extern int value_contents_eq (const struct value *val1, int offset1,
571 const struct value *val2, int offset2,
574 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
575 is (or will be copied to) VAL's contents buffer offset by
576 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
577 Marks value contents ranges as unavailable if the corresponding
578 memory is likewise unavailable. STACK indicates whether the memory
579 is known to be stack memory. */
581 extern void read_value_memory (struct value *val, int embedded_offset,
582 int stack, CORE_ADDR memaddr,
583 gdb_byte *buffer, size_t length);
585 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
586 into each element of a new vector value with VECTOR_TYPE. */
588 struct value *value_vector_widen (struct value *scalar_value,
589 struct type *vector_type);
594 #include "gdbtypes.h"
595 #include "expression.h"
600 extern int print_address_demangle (const struct value_print_options *,
601 struct gdbarch *, CORE_ADDR,
602 struct ui_file *, int);
604 extern LONGEST value_as_long (struct value *val);
605 extern DOUBLEST value_as_double (struct value *val);
606 extern CORE_ADDR value_as_address (struct value *val);
608 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
609 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
611 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
613 extern LONGEST unpack_field_as_long (struct type *type,
614 const gdb_byte *valaddr,
616 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
617 int embedded_offset, int fieldno,
618 const struct value *val, LONGEST *result);
620 extern void unpack_value_bitfield (struct value *dest_val,
621 int bitpos, int bitsize,
622 const gdb_byte *valaddr, int embedded_offset,
623 const struct value *val);
625 extern struct value *value_field_bitfield (struct type *type, int fieldno,
626 const gdb_byte *valaddr,
628 const struct value *val);
630 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
632 extern struct value *value_from_longest (struct type *type, LONGEST num);
633 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
634 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
635 extern struct value *value_from_double (struct type *type, DOUBLEST num);
636 extern struct value *value_from_decfloat (struct type *type,
637 const gdb_byte *decbytes);
638 extern struct value *value_from_history_ref (const char *, const char **);
640 extern struct value *value_at (struct type *type, CORE_ADDR addr);
641 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
643 extern struct value *value_from_contents_and_address_unresolved
644 (struct type *, const gdb_byte *, CORE_ADDR);
645 extern struct value *value_from_contents_and_address (struct type *,
648 extern struct value *value_from_contents (struct type *, const gdb_byte *);
650 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
653 struct frame_id frame_id);
655 extern void read_frame_register_value (struct value *value,
656 struct frame_info *frame);
658 extern struct value *value_from_register (struct type *type, int regnum,
659 struct frame_info *frame);
661 extern CORE_ADDR address_from_register (int regnum,
662 struct frame_info *frame);
664 extern struct value *value_of_variable (struct symbol *var,
665 const struct block *b);
667 extern struct value *address_of_variable (struct symbol *var,
668 const struct block *b);
670 extern struct value *value_of_register (int regnum, struct frame_info *frame);
672 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
674 extern int symbol_read_needs_frame (struct symbol *);
676 extern struct value *read_var_value (struct symbol *var,
677 struct frame_info *frame);
679 extern struct value *default_read_var_value (struct symbol *var,
680 struct frame_info *frame);
682 extern struct value *allocate_value (struct type *type);
683 extern struct value *allocate_value_lazy (struct type *type);
684 extern void value_contents_copy (struct value *dst, int dst_offset,
685 struct value *src, int src_offset,
687 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
688 struct value *src, int src_offset,
691 extern struct value *allocate_repeat_value (struct type *type, int count);
693 extern struct value *value_mark (void);
695 extern void value_free_to_mark (struct value *mark);
697 extern struct value *value_cstring (char *ptr, ssize_t len,
698 struct type *char_type);
699 extern struct value *value_string (char *ptr, ssize_t len,
700 struct type *char_type);
702 extern struct value *value_array (int lowbound, int highbound,
703 struct value **elemvec);
705 extern struct value *value_concat (struct value *arg1, struct value *arg2);
707 extern struct value *value_binop (struct value *arg1, struct value *arg2,
710 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
712 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
714 extern int value_must_coerce_to_target (struct value *arg1);
716 extern struct value *value_coerce_to_target (struct value *arg1);
718 extern struct value *value_coerce_array (struct value *arg1);
720 extern struct value *value_coerce_function (struct value *arg1);
722 extern struct value *value_ind (struct value *arg1);
724 extern struct value *value_addr (struct value *arg1);
726 extern struct value *value_ref (struct value *arg1);
728 extern struct value *value_assign (struct value *toval,
729 struct value *fromval);
731 extern struct value *value_pos (struct value *arg1);
733 extern struct value *value_neg (struct value *arg1);
735 extern struct value *value_complement (struct value *arg1);
737 extern struct value *value_struct_elt (struct value **argp,
739 const char *name, int *static_memfuncp,
742 extern struct value *value_struct_elt_bitpos (struct value **argp,
744 struct type *field_type,
747 extern struct value *value_aggregate_elt (struct type *curtype,
749 struct type *expect_type,
753 extern struct value *value_static_field (struct type *type, int fieldno);
755 enum oload_search_type { NON_METHOD, METHOD, BOTH };
757 extern int find_overload_match (struct value **args, int nargs,
759 enum oload_search_type method,
760 struct value **objp, struct symbol *fsym,
761 struct value **valp, struct symbol **symp,
762 int *staticp, const int no_adl,
765 extern struct value *value_field (struct value *arg1, int fieldno);
767 extern struct value *value_primitive_field (struct value *arg1, int offset,
769 struct type *arg_type);
772 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
775 extern struct value *value_full_object (struct value *, struct type *, int,
778 extern struct value *value_cast_pointers (struct type *, struct value *, int);
780 extern struct value *value_cast (struct type *type, struct value *arg2);
782 extern struct value *value_reinterpret_cast (struct type *type,
785 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
787 extern struct value *value_zero (struct type *type, enum lval_type lv);
789 extern struct value *value_one (struct type *type);
791 extern struct value *value_repeat (struct value *arg1, int count);
793 extern struct value *value_subscript (struct value *array, LONGEST index);
795 extern struct value *value_bitstring_subscript (struct type *type,
796 struct value *bitstring,
799 extern struct value *register_value_being_returned (struct type *valtype,
800 struct regcache *retbuf);
802 extern int value_in (struct value *element, struct value *set);
804 extern int value_bit_index (struct type *type, const gdb_byte *addr,
807 extern enum return_value_convention
808 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
809 struct type *value_type);
811 extern int using_struct_return (struct gdbarch *gdbarch,
812 struct value *function,
813 struct type *value_type);
815 extern struct value *evaluate_expression (struct expression *exp);
817 extern struct value *evaluate_type (struct expression *exp);
819 extern struct value *evaluate_subexp (struct type *expect_type,
820 struct expression *exp,
821 int *pos, enum noside noside);
823 extern struct value *evaluate_subexpression_type (struct expression *exp,
826 extern void fetch_subexp_value (struct expression *exp, int *pc,
827 struct value **valp, struct value **resultp,
828 struct value **val_chain,
829 int preserve_errors);
831 extern char *extract_field_op (struct expression *exp, int *subexp);
833 extern struct value *evaluate_subexp_with_coercion (struct expression *,
836 extern struct value *parse_and_eval (const char *exp);
838 extern struct value *parse_to_comma_and_eval (const char **expp);
840 extern struct type *parse_and_eval_type (char *p, int length);
842 extern CORE_ADDR parse_and_eval_address (const char *exp);
844 extern LONGEST parse_and_eval_long (const char *exp);
846 extern void unop_promote (const struct language_defn *language,
847 struct gdbarch *gdbarch,
848 struct value **arg1);
850 extern void binop_promote (const struct language_defn *language,
851 struct gdbarch *gdbarch,
852 struct value **arg1, struct value **arg2);
854 extern struct value *access_value_history (int num);
856 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
857 struct internalvar *var);
859 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
861 extern void set_internalvar (struct internalvar *var, struct value *val);
863 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
865 extern void set_internalvar_string (struct internalvar *var,
868 extern void clear_internalvar (struct internalvar *var);
870 extern void set_internalvar_component (struct internalvar *var,
872 int bitpos, int bitsize,
873 struct value *newvalue);
875 extern struct internalvar *lookup_only_internalvar (const char *name);
877 extern struct internalvar *create_internalvar (const char *name);
879 extern VEC (char_ptr) *complete_internalvar (const char *name);
881 /* An internalvar can be dynamically computed by supplying a vector of
882 function pointers to perform various operations. */
884 struct internalvar_funcs
886 /* Compute the value of the variable. The DATA argument passed to
887 the function is the same argument that was passed to
888 `create_internalvar_type_lazy'. */
890 struct value *(*make_value) (struct gdbarch *arch,
891 struct internalvar *var,
894 /* Update the agent expression EXPR with bytecode to compute the
895 value. VALUE is the agent value we are updating. The DATA
896 argument passed to this function is the same argument that was
897 passed to `create_internalvar_type_lazy'. If this pointer is
898 NULL, then the internalvar cannot be compiled to an agent
901 void (*compile_to_ax) (struct internalvar *var,
902 struct agent_expr *expr,
903 struct axs_value *value,
906 /* If non-NULL, this is called to destroy DATA. The DATA argument
907 passed to this function is the same argument that was passed to
908 `create_internalvar_type_lazy'. */
910 void (*destroy) (void *data);
913 extern struct internalvar *create_internalvar_type_lazy (const char *name,
914 const struct internalvar_funcs *funcs,
917 /* Compile an internal variable to an agent expression. VAR is the
918 variable to compile; EXPR and VALUE are the agent expression we are
919 updating. This will return 0 if there is no known way to compile
920 VAR, and 1 if VAR was successfully compiled. It may also throw an
921 exception on error. */
923 extern int compile_internalvar_to_ax (struct internalvar *var,
924 struct agent_expr *expr,
925 struct axs_value *value);
927 extern struct internalvar *lookup_internalvar (const char *name);
929 extern int value_equal (struct value *arg1, struct value *arg2);
931 extern int value_equal_contents (struct value *arg1, struct value *arg2);
933 extern int value_less (struct value *arg1, struct value *arg2);
935 extern int value_logical_not (struct value *arg1);
939 extern struct value *value_of_this (const struct language_defn *lang);
941 extern struct value *value_of_this_silent (const struct language_defn *lang);
943 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
945 enum exp_opcode otherop,
948 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
951 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
952 int j, struct type *type, int offset);
954 extern int binop_types_user_defined_p (enum exp_opcode op,
958 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
961 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
963 extern int destructor_name_p (const char *name, struct type *type);
965 extern void value_incref (struct value *val);
967 extern void value_free (struct value *val);
969 extern void free_all_values (void);
971 extern void free_value_chain (struct value *v);
973 extern void release_value (struct value *val);
975 extern void release_value_or_incref (struct value *val);
977 extern int record_latest_value (struct value *val);
979 extern void modify_field (struct type *type, gdb_byte *addr,
980 LONGEST fieldval, int bitpos, int bitsize);
982 extern void type_print (struct type *type, const char *varstring,
983 struct ui_file *stream, int show);
985 extern char *type_to_string (struct type *type);
987 extern gdb_byte *baseclass_addr (struct type *type, int index,
989 struct value **valuep, int *errp);
991 extern void print_longest (struct ui_file *stream, int format,
992 int use_local, LONGEST val);
994 extern void print_floating (const gdb_byte *valaddr, struct type *type,
995 struct ui_file *stream);
997 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
998 struct ui_file *stream);
1000 extern void value_print (struct value *val, struct ui_file *stream,
1001 const struct value_print_options *options);
1003 extern void value_print_array_elements (struct value *val,
1004 struct ui_file *stream, int format,
1005 enum val_prettyformat pretty);
1007 extern struct value *value_release_to_mark (struct value *mark);
1009 extern void val_print (struct type *type, const gdb_byte *valaddr,
1010 int embedded_offset, CORE_ADDR address,
1011 struct ui_file *stream, int recurse,
1012 const struct value *val,
1013 const struct value_print_options *options,
1014 const struct language_defn *language);
1016 extern void common_val_print (struct value *val,
1017 struct ui_file *stream, int recurse,
1018 const struct value_print_options *options,
1019 const struct language_defn *language);
1021 extern int val_print_string (struct type *elttype, const char *encoding,
1022 CORE_ADDR addr, int len,
1023 struct ui_file *stream,
1024 const struct value_print_options *options);
1026 extern void print_variable_and_value (const char *name,
1028 struct frame_info *frame,
1029 struct ui_file *stream,
1032 extern void typedef_print (struct type *type, struct symbol *news,
1033 struct ui_file *stream);
1035 extern char *internalvar_name (struct internalvar *var);
1037 extern void preserve_values (struct objfile *);
1041 extern struct value *value_copy (struct value *);
1043 extern struct value *value_non_lval (struct value *);
1045 extern void value_force_lval (struct value *, CORE_ADDR);
1047 extern struct value *make_cv_value (int, int, struct value *);
1049 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
1053 extern struct value *varying_to_slice (struct value *);
1055 extern struct value *value_slice (struct value *, int, int);
1057 extern struct value *value_literal_complex (struct value *, struct value *,
1060 extern struct value *find_function_in_inferior (const char *,
1063 extern struct value *value_allocate_space_in_inferior (int);
1065 extern struct value *value_subscripted_rvalue (struct value *array,
1066 LONGEST index, int lowerbound);
1068 /* User function handler. */
1070 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
1071 const struct language_defn *language,
1074 struct value **argv);
1076 void add_internal_function (const char *name, const char *doc,
1077 internal_function_fn handler,
1080 struct value *call_internal_function (struct gdbarch *gdbarch,
1081 const struct language_defn *language,
1082 struct value *function,
1083 int argc, struct value **argv);
1085 char *value_internal_function_name (struct value *);
1087 extern struct value *value_of_xmethod (struct xmethod_worker *);
1089 extern struct type *result_type_of_xmethod (struct value *method,
1090 int argc, struct value **argv);
1092 extern struct value *call_xmethod (struct value *method,
1093 int argc, struct value **argv);
1095 #endif /* !defined (VALUE_H) */