1 /* Definitions for values of C expressions, for GDB.
3 Copyright (C) 1986-2016 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 (const 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 LONGEST value_bitsize (const struct value *);
116 extern void set_value_bitsize (struct value *, LONGEST 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 LONGEST value_bitpos (const struct value *);
123 extern void set_value_bitpos (struct value *, LONGEST 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 (const 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 LONGEST value_offset (const struct value *);
139 extern void set_value_offset (struct value *, LONGEST 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 (const 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 (const 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 LONGEST value_pointed_to_offset (const struct value *value);
209 extern void set_value_pointed_to_offset (struct value *value, LONGEST val);
210 extern LONGEST value_embedded_offset (const struct value *value);
211 extern void set_value_embedded_offset (struct value *value, LONGEST 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 LONGEST 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,
286 LONGEST embedded_offset,
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 (const struct value *);
316 extern void set_value_lazy (struct value *value, int val);
318 extern int value_stack (const 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 LONGEST offset, LONGEST 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 (const 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 (const 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 const struct type *original_type,
462 const 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 LONGEST offset, LONGEST 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 LONGEST offset, LONGEST 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 LONGEST offset, LONGEST 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 LONGEST offset, LONGEST 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 LONGEST offset, LONGEST 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, LONGEST offset1,
571 const struct value *val2, LONGEST offset2,
574 /* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
575 which 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, LONGEST 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 LONGEST embedded_offset, int fieldno,
618 const struct value *val, LONGEST *result);
620 extern void unpack_value_bitfield (struct value *dest_val,
621 LONGEST bitpos, LONGEST bitsize,
622 const gdb_byte *valaddr,
623 LONGEST embedded_offset,
624 const struct value *val);
626 extern struct value *value_field_bitfield (struct type *type, int fieldno,
627 const gdb_byte *valaddr,
628 LONGEST embedded_offset,
629 const struct value *val);
631 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
633 extern struct value *value_from_longest (struct type *type, LONGEST num);
634 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
635 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
636 extern struct value *value_from_double (struct type *type, DOUBLEST num);
637 extern struct value *value_from_decfloat (struct type *type,
638 const gdb_byte *decbytes);
639 extern struct value *value_from_history_ref (const char *, const char **);
641 extern struct value *value_at (struct type *type, CORE_ADDR addr);
642 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
644 extern struct value *value_from_contents_and_address_unresolved
645 (struct type *, const gdb_byte *, CORE_ADDR);
646 extern struct value *value_from_contents_and_address (struct type *,
649 extern struct value *value_from_contents (struct type *, const gdb_byte *);
651 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
654 struct frame_id frame_id);
656 extern void read_frame_register_value (struct value *value,
657 struct frame_info *frame);
659 extern struct value *value_from_register (struct type *type, int regnum,
660 struct frame_info *frame);
662 extern CORE_ADDR address_from_register (int regnum,
663 struct frame_info *frame);
665 extern struct value *value_of_variable (struct symbol *var,
666 const struct block *b);
668 extern struct value *address_of_variable (struct symbol *var,
669 const struct block *b);
671 extern struct value *value_of_register (int regnum, struct frame_info *frame);
673 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
675 /* Return the symbol's reading requirement. */
677 extern enum symbol_needs_kind symbol_read_needs (struct symbol *);
679 /* Return true if the symbol needs a frame. This is a wrapper for
680 symbol_read_needs that simply checks for SYMBOL_NEEDS_FRAME. */
682 extern int symbol_read_needs_frame (struct symbol *);
684 extern struct value *read_var_value (struct symbol *var,
685 const struct block *var_block,
686 struct frame_info *frame);
688 extern struct value *default_read_var_value (struct symbol *var,
689 const struct block *var_block,
690 struct frame_info *frame);
692 extern struct value *allocate_value (struct type *type);
693 extern struct value *allocate_value_lazy (struct type *type);
694 extern void value_contents_copy (struct value *dst, LONGEST dst_offset,
695 struct value *src, LONGEST src_offset,
697 extern void value_contents_copy_raw (struct value *dst, LONGEST dst_offset,
698 struct value *src, LONGEST src_offset,
701 extern struct value *allocate_repeat_value (struct type *type, int count);
703 extern struct value *value_mark (void);
705 extern void value_free_to_mark (const struct value *mark);
707 extern struct value *value_cstring (const char *ptr, ssize_t len,
708 struct type *char_type);
709 extern struct value *value_string (const char *ptr, ssize_t len,
710 struct type *char_type);
712 extern struct value *value_array (int lowbound, int highbound,
713 struct value **elemvec);
715 extern struct value *value_concat (struct value *arg1, struct value *arg2);
717 extern struct value *value_binop (struct value *arg1, struct value *arg2,
720 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
722 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
724 extern int value_must_coerce_to_target (struct value *arg1);
726 extern struct value *value_coerce_to_target (struct value *arg1);
728 extern struct value *value_coerce_array (struct value *arg1);
730 extern struct value *value_coerce_function (struct value *arg1);
732 extern struct value *value_ind (struct value *arg1);
734 extern struct value *value_addr (struct value *arg1);
736 extern struct value *value_ref (struct value *arg1);
738 extern struct value *value_assign (struct value *toval,
739 struct value *fromval);
741 extern struct value *value_pos (struct value *arg1);
743 extern struct value *value_neg (struct value *arg1);
745 extern struct value *value_complement (struct value *arg1);
747 extern struct value *value_struct_elt (struct value **argp,
749 const char *name, int *static_memfuncp,
752 extern struct value *value_struct_elt_bitpos (struct value **argp,
754 struct type *field_type,
757 extern struct value *value_aggregate_elt (struct type *curtype,
759 struct type *expect_type,
763 extern struct value *value_static_field (struct type *type, int fieldno);
765 enum oload_search_type { NON_METHOD, METHOD, BOTH };
767 extern int find_overload_match (struct value **args, int nargs,
769 enum oload_search_type method,
770 struct value **objp, struct symbol *fsym,
771 struct value **valp, struct symbol **symp,
772 int *staticp, const int no_adl,
775 extern struct value *value_field (struct value *arg1, int fieldno);
777 extern struct value *value_primitive_field (struct value *arg1, LONGEST offset,
779 struct type *arg_type);
782 extern struct type *value_rtti_indirect_type (struct value *, int *, LONGEST *,
785 extern struct value *value_full_object (struct value *, struct type *, int,
788 extern struct value *value_cast_pointers (struct type *, struct value *, int);
790 extern struct value *value_cast (struct type *type, struct value *arg2);
792 extern struct value *value_reinterpret_cast (struct type *type,
795 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
797 extern struct value *value_zero (struct type *type, enum lval_type lv);
799 extern struct value *value_one (struct type *type);
801 extern struct value *value_repeat (struct value *arg1, int count);
803 extern struct value *value_subscript (struct value *array, LONGEST index);
805 extern struct value *value_bitstring_subscript (struct type *type,
806 struct value *bitstring,
809 extern struct value *register_value_being_returned (struct type *valtype,
810 struct regcache *retbuf);
812 extern int value_in (struct value *element, struct value *set);
814 extern int value_bit_index (struct type *type, const gdb_byte *addr,
817 extern enum return_value_convention
818 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
819 struct type *value_type);
821 extern int using_struct_return (struct gdbarch *gdbarch,
822 struct value *function,
823 struct type *value_type);
825 extern struct value *evaluate_expression (struct expression *exp);
827 extern struct value *evaluate_type (struct expression *exp);
829 extern struct value *evaluate_subexp (struct type *expect_type,
830 struct expression *exp,
831 int *pos, enum noside noside);
833 extern struct value *evaluate_subexpression_type (struct expression *exp,
836 extern void fetch_subexp_value (struct expression *exp, int *pc,
837 struct value **valp, struct value **resultp,
838 struct value **val_chain,
839 int preserve_errors);
841 extern char *extract_field_op (struct expression *exp, int *subexp);
843 extern struct value *evaluate_subexp_with_coercion (struct expression *,
846 extern struct value *parse_and_eval (const char *exp);
848 extern struct value *parse_to_comma_and_eval (const char **expp);
850 extern struct type *parse_and_eval_type (char *p, int length);
852 extern CORE_ADDR parse_and_eval_address (const char *exp);
854 extern LONGEST parse_and_eval_long (const char *exp);
856 extern void unop_promote (const struct language_defn *language,
857 struct gdbarch *gdbarch,
858 struct value **arg1);
860 extern void binop_promote (const struct language_defn *language,
861 struct gdbarch *gdbarch,
862 struct value **arg1, struct value **arg2);
864 extern struct value *access_value_history (int num);
866 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
867 struct internalvar *var);
869 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
871 extern void set_internalvar (struct internalvar *var, struct value *val);
873 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
875 extern void set_internalvar_string (struct internalvar *var,
878 extern void clear_internalvar (struct internalvar *var);
880 extern void set_internalvar_component (struct internalvar *var,
882 LONGEST bitpos, LONGEST bitsize,
883 struct value *newvalue);
885 extern struct internalvar *lookup_only_internalvar (const char *name);
887 extern struct internalvar *create_internalvar (const char *name);
889 extern VEC (char_ptr) *complete_internalvar (const char *name);
891 /* An internalvar can be dynamically computed by supplying a vector of
892 function pointers to perform various operations. */
894 struct internalvar_funcs
896 /* Compute the value of the variable. The DATA argument passed to
897 the function is the same argument that was passed to
898 `create_internalvar_type_lazy'. */
900 struct value *(*make_value) (struct gdbarch *arch,
901 struct internalvar *var,
904 /* Update the agent expression EXPR with bytecode to compute the
905 value. VALUE is the agent value we are updating. The DATA
906 argument passed to this function is the same argument that was
907 passed to `create_internalvar_type_lazy'. If this pointer is
908 NULL, then the internalvar cannot be compiled to an agent
911 void (*compile_to_ax) (struct internalvar *var,
912 struct agent_expr *expr,
913 struct axs_value *value,
916 /* If non-NULL, this is called to destroy DATA. The DATA argument
917 passed to this function is the same argument that was passed to
918 `create_internalvar_type_lazy'. */
920 void (*destroy) (void *data);
923 extern struct internalvar *create_internalvar_type_lazy (const char *name,
924 const struct internalvar_funcs *funcs,
927 /* Compile an internal variable to an agent expression. VAR is the
928 variable to compile; EXPR and VALUE are the agent expression we are
929 updating. This will return 0 if there is no known way to compile
930 VAR, and 1 if VAR was successfully compiled. It may also throw an
931 exception on error. */
933 extern int compile_internalvar_to_ax (struct internalvar *var,
934 struct agent_expr *expr,
935 struct axs_value *value);
937 extern struct internalvar *lookup_internalvar (const char *name);
939 extern int value_equal (struct value *arg1, struct value *arg2);
941 extern int value_equal_contents (struct value *arg1, struct value *arg2);
943 extern int value_less (struct value *arg1, struct value *arg2);
945 extern int value_logical_not (struct value *arg1);
949 extern struct value *value_of_this (const struct language_defn *lang);
951 extern struct value *value_of_this_silent (const struct language_defn *lang);
953 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
955 enum exp_opcode otherop,
958 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
961 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
962 int j, struct type *type, LONGEST offset);
964 extern int binop_types_user_defined_p (enum exp_opcode op,
968 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
971 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
973 extern int destructor_name_p (const char *name, struct type *type);
975 extern void value_incref (struct value *val);
977 extern void value_free (struct value *val);
979 extern void free_all_values (void);
981 extern void free_value_chain (struct value *v);
983 extern void release_value (struct value *val);
985 extern void release_value_or_incref (struct value *val);
987 extern int record_latest_value (struct value *val);
989 extern void modify_field (struct type *type, gdb_byte *addr,
990 LONGEST fieldval, LONGEST bitpos, LONGEST bitsize);
992 extern void type_print (struct type *type, const char *varstring,
993 struct ui_file *stream, int show);
995 extern char *type_to_string (struct type *type);
997 extern gdb_byte *baseclass_addr (struct type *type, int index,
999 struct value **valuep, int *errp);
1001 extern void print_longest (struct ui_file *stream, int format,
1002 int use_local, LONGEST val);
1004 extern void print_floating (const gdb_byte *valaddr, struct type *type,
1005 struct ui_file *stream);
1007 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
1008 struct ui_file *stream);
1010 extern void value_print (struct value *val, struct ui_file *stream,
1011 const struct value_print_options *options);
1013 extern void value_print_array_elements (struct value *val,
1014 struct ui_file *stream, int format,
1015 enum val_prettyformat pretty);
1017 extern struct value *value_release_to_mark (const struct value *mark);
1019 extern void val_print (struct type *type, const gdb_byte *valaddr,
1020 LONGEST embedded_offset, CORE_ADDR address,
1021 struct ui_file *stream, int recurse,
1022 const struct value *val,
1023 const struct value_print_options *options,
1024 const struct language_defn *language);
1026 extern void common_val_print (struct value *val,
1027 struct ui_file *stream, int recurse,
1028 const struct value_print_options *options,
1029 const struct language_defn *language);
1031 extern int val_print_string (struct type *elttype, const char *encoding,
1032 CORE_ADDR addr, int len,
1033 struct ui_file *stream,
1034 const struct value_print_options *options);
1036 extern void print_variable_and_value (const char *name,
1038 struct frame_info *frame,
1039 struct ui_file *stream,
1042 extern void typedef_print (struct type *type, struct symbol *news,
1043 struct ui_file *stream);
1045 extern char *internalvar_name (const struct internalvar *var);
1047 extern void preserve_values (struct objfile *);
1051 extern struct value *value_copy (struct value *);
1053 extern struct value *value_non_lval (struct value *);
1055 extern void value_force_lval (struct value *, CORE_ADDR);
1057 extern struct value *make_cv_value (int, int, struct value *);
1059 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
1063 extern struct value *varying_to_slice (struct value *);
1065 extern struct value *value_slice (struct value *, int, int);
1067 extern struct value *value_literal_complex (struct value *, struct value *,
1070 extern struct value *find_function_in_inferior (const char *,
1073 extern struct value *value_allocate_space_in_inferior (int);
1075 extern struct value *value_subscripted_rvalue (struct value *array,
1076 LONGEST index, int lowerbound);
1078 /* User function handler. */
1080 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
1081 const struct language_defn *language,
1084 struct value **argv);
1086 void add_internal_function (const char *name, const char *doc,
1087 internal_function_fn handler,
1090 struct value *call_internal_function (struct gdbarch *gdbarch,
1091 const struct language_defn *language,
1092 struct value *function,
1093 int argc, struct value **argv);
1095 char *value_internal_function_name (struct value *);
1097 extern struct value *value_of_xmethod (struct xmethod_worker *);
1099 extern struct type *result_type_of_xmethod (struct value *method,
1100 int argc, struct value **argv);
1102 extern struct value *call_xmethod (struct value *method,
1103 int argc, struct value **argv);
1105 #endif /* !defined (VALUE_H) */