bbf662de624e629e28445ce77afe7053ab47154b
1 /* Definitions for values of C expressions, for GDB.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
24 #if !defined (VALUE_H)
28 #include "frame.h" /* For struct frame_id. */
37 /* The structure which defines the type of a value. It should never
38 be possible for a program lval value to survive over a call to the
39 inferior (i.e. to be put into the history list or an internal
44 /* Values are stored in a chain, so that they can be deleted easily
45 over calls to the inferior. Values assigned to internal variables
46 or put into the value history are taken off this list. */
48 struct value
*value_next (struct value
*);
50 /* Type of the value. */
52 extern struct type
*value_type (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 (struct value
*);
64 extern void set_value_bitsize (struct value
*, int bit
);
66 /* Only used for bitfields; position of start of field. For
67 BITS_BIG_ENDIAN=0 targets, it is the position of the LSB. For
68 BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
70 extern int value_bitpos (struct value
*);
71 extern void set_value_bitpos (struct value
*, int bit
);
73 /* Describes offset of a value within lval of a structure in bytes.
74 If lval == lval_memory, this is an offset to the address. If lval
75 == lval_register, this is a further offset from location.address
76 within the registers structure. Note also the member
77 embedded_offset below. */
79 extern int value_offset (struct value
*);
80 extern void set_value_offset (struct value
*, int offset
);
82 /* The comment from "struct value" reads: ``Is it modifiable? Only
83 relevant if lval != not_lval.''. Shouldn't the value instead be
84 not_lval and be done with it? */
86 extern int deprecated_value_modifiable (struct value
*value
);
87 extern void deprecated_set_value_modifiable (struct value
*value
,
90 /* If a value represents a C++ object, then the `type' field gives the
91 object's compile-time type. If the object actually belongs to some
92 class derived from `type', perhaps with other base classes and
93 additional members, then `type' is just a subobject of the real
94 thing, and the full object is probably larger than `type' would
97 If `type' is a dynamic class (i.e. one with a vtable), then GDB can
98 actually determine the object's run-time type by looking at the
99 run-time type information in the vtable. When this information is
100 available, we may elect to read in the entire object, for several
103 - When printing the value, the user would probably rather see the
104 full object, not just the limited portion apparent from the
107 - If `type' has virtual base classes, then even printing `type'
108 alone may require reaching outside the `type' portion of the
109 object to wherever the virtual base class has been stored.
111 When we store the entire object, `enclosing_type' is the run-time
112 type -- the complete object -- and `embedded_offset' is the offset
113 of `type' within that larger type, in bytes. The value_contents()
114 macro takes `embedded_offset' into account, so most GDB code
115 continues to see the `type' portion of the value, just as the
118 If `type' is a pointer to an object, then `enclosing_type' is a
119 pointer to the object's run-time type, and `pointed_to_offset' is
120 the offset in bytes from the full object to the pointed-to object
121 -- that is, the value `embedded_offset' would have if we followed
122 the pointer and fetched the complete object. (I don't really see
123 the point. Why not just determine the run-time type when you
124 indirect, and avoid the special case? The contents don't matter
125 until you indirect anyway.)
127 If we're not doing anything fancy, `enclosing_type' is equal to
128 `type', and `embedded_offset' is zero, so everything works
131 extern struct type
*value_enclosing_type (struct value
*);
132 extern struct value
*value_change_enclosing_type (struct value
*val
,
133 struct type
*new_type
);
134 extern int value_pointed_to_offset (struct value
*value
);
135 extern void set_value_pointed_to_offset (struct value
*value
, int val
);
136 extern int value_embedded_offset (struct value
*value
);
137 extern void set_value_embedded_offset (struct value
*value
, int val
);
139 /* If zero, contents of this value are in the contents field. If
140 nonzero, contents are in inferior memory at address in the
141 location.address field plus the offset field (and the lval field
142 should be lval_memory).
144 WARNING: This field is used by the code which handles watchpoints
145 (see breakpoint.c) to decide whether a particular value can be
146 watched by hardware watchpoints. If the lazy flag is set for some
147 member of a value chain, it is assumed that this member of the
148 chain doesn't need to be watched as part of watching the value
149 itself. This is how GDB avoids watching the entire struct or array
150 when the user wants to watch a single struct member or array
151 element. If you ever change the way lazy flag is set and reset, be
152 sure to consider this use as well! */
154 extern int value_lazy (struct value
*);
155 extern void set_value_lazy (struct value
*value
, int val
);
157 /* value_contents() and value_contents_raw() both return the address
158 of the gdb buffer used to hold a copy of the contents of the lval.
159 value_contents() is used when the contents of the buffer are needed
160 -- it uses value_fetch_lazy() to load the buffer from the process
161 being debugged if it hasn't already been loaded
162 (value_contents_writeable() is used when a writeable but fetched
163 buffer is required).. value_contents_raw() is used when data is
164 being stored into the buffer, or when it is certain that the
165 contents of the buffer are valid.
167 Note: The contents pointer is adjusted by the offset required to
168 get to the real subobject, if the value happens to represent
169 something embedded in a larger run-time object. */
171 extern gdb_byte
*value_contents_raw (struct value
*);
173 /* Actual contents of the value. For use of this value; setting it
174 uses the stuff above. Not valid if lazy is nonzero. Target
175 byte-order. We force it to be aligned properly for any possible
176 value. Note that a value therefore extends beyond what is
179 extern const gdb_byte
*value_contents (struct value
*);
180 extern gdb_byte
*value_contents_writeable (struct value
*);
182 /* The ALL variants of the above two macros do not adjust the returned
183 pointer by the embedded_offset value. */
185 extern gdb_byte
*value_contents_all_raw (struct value
*);
186 extern const gdb_byte
*value_contents_all (struct value
*);
188 extern int value_fetch_lazy (struct value
*val
);
189 extern int value_contents_equal (struct value
*val1
, struct value
*val2
);
191 /* If nonzero, this is the value of a variable which does not actually
192 exist in the program. */
193 extern int value_optimized_out (struct value
*value
);
194 extern void set_value_optimized_out (struct value
*value
, int val
);
196 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
197 single value might have multiple LVALs), this hacked interface is
198 limited to just the first PIECE. Expect further change. */
199 /* Type of value; either not an lval, or one of the various different
200 possible kinds of lval. */
201 extern enum lval_type
*deprecated_value_lval_hack (struct value
*);
202 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
204 /* If lval == lval_memory, this is the address in the inferior. If
205 lval == lval_register, this is the byte offset into the registers
207 extern CORE_ADDR
*deprecated_value_address_hack (struct value
*);
208 #define VALUE_ADDRESS(val) (*deprecated_value_address_hack (val))
210 /* Pointer to internal variable. */
211 extern struct internalvar
**deprecated_value_internalvar_hack (struct value
*);
212 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
214 /* Frame register value is relative to. This will be described in the
215 lval enum above as "lval_register". */
216 extern struct frame_id
*deprecated_value_frame_id_hack (struct value
*);
217 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
219 /* Register number if the value is from a register. */
220 extern short *deprecated_value_regnum_hack (struct value
*);
221 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
223 /* Convert a REF to the object referenced. */
225 extern struct value
*coerce_ref (struct value
*value
);
227 /* If ARG is an array, convert it to a pointer.
228 If ARG is an enum, convert it to an integer.
229 If ARG is a function, convert it to a function pointer.
231 References are dereferenced. */
233 extern struct value
*coerce_array (struct value
*value
);
234 extern struct value
*coerce_number (struct value
*value
);
236 /* If ARG is an enum, convert it to an integer. */
238 extern struct value
*coerce_enum (struct value
*value
);
240 /* Internal variables (variables for convenience of use of debugger)
241 are recorded as a chain of these structures. */
245 struct internalvar
*next
;
254 #include "gdbtypes.h"
255 #include "expression.h"
260 extern void print_address_demangle (CORE_ADDR
, struct ui_file
*, int);
262 extern LONGEST
value_as_long (struct value
*val
);
263 extern DOUBLEST
value_as_double (struct value
*val
);
264 extern CORE_ADDR
value_as_address (struct value
*val
);
266 extern LONGEST
unpack_long (struct type
*type
, const gdb_byte
*valaddr
);
267 extern DOUBLEST
unpack_double (struct type
*type
, const gdb_byte
*valaddr
,
269 extern CORE_ADDR
unpack_pointer (struct type
*type
, const gdb_byte
*valaddr
);
270 extern LONGEST
unpack_field_as_long (struct type
*type
,
271 const gdb_byte
*valaddr
,
274 extern void pack_long (gdb_byte
*buf
, struct type
*type
, LONGEST num
);
276 extern struct value
*value_from_longest (struct type
*type
, LONGEST num
);
277 extern struct value
*value_from_pointer (struct type
*type
, CORE_ADDR addr
);
278 extern struct value
*value_from_double (struct type
*type
, DOUBLEST num
);
279 extern struct value
*value_from_string (char *string
);
281 extern struct value
*value_at (struct type
*type
, CORE_ADDR addr
);
282 extern struct value
*value_at_lazy (struct type
*type
, CORE_ADDR addr
);
284 extern struct value
*default_value_from_register (struct type
*type
,
286 struct frame_info
*frame
);
288 extern struct value
*value_from_register (struct type
*type
, int regnum
,
289 struct frame_info
*frame
);
291 extern CORE_ADDR
address_from_register (struct type
*type
, int regnum
,
292 struct frame_info
*frame
);
294 extern struct value
*value_of_variable (struct symbol
*var
, struct block
*b
);
296 extern struct value
*value_of_register (int regnum
, struct frame_info
*frame
);
298 extern int symbol_read_needs_frame (struct symbol
*);
300 extern struct value
*read_var_value (struct symbol
*var
,
301 struct frame_info
*frame
);
303 extern struct value
*locate_var_value (struct symbol
*var
,
304 struct frame_info
*frame
);
306 extern struct value
*allocate_value (struct type
*type
);
308 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
310 extern struct value
*value_mark (void);
312 extern void value_free_to_mark (struct value
*mark
);
314 extern struct value
*value_string (char *ptr
, int len
);
315 extern struct value
*value_bitstring (char *ptr
, int len
);
317 extern struct value
*value_array (int lowbound
, int highbound
,
318 struct value
**elemvec
);
320 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
322 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
325 extern struct value
*value_add (struct value
*arg1
, struct value
*arg2
);
327 extern struct value
*value_sub (struct value
*arg1
, struct value
*arg2
);
329 extern struct value
*value_coerce_array (struct value
*arg1
);
331 extern struct value
*value_coerce_function (struct value
*arg1
);
333 extern struct value
*value_ind (struct value
*arg1
);
335 extern struct value
*value_addr (struct value
*arg1
);
337 extern struct value
*value_ref (struct value
*arg1
);
339 extern struct value
*value_assign (struct value
*toval
,
340 struct value
*fromval
);
342 extern struct value
*value_pos (struct value
*arg1
);
344 extern struct value
*value_neg (struct value
*arg1
);
346 extern struct value
*value_complement (struct value
*arg1
);
348 extern struct value
*value_struct_elt (struct value
**argp
,
350 char *name
, int *static_memfuncp
,
353 extern struct value
*value_aggregate_elt (struct type
*curtype
,
358 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
360 extern struct fn_field
*value_find_oload_method_list (struct value
**, char *,
362 struct type
**, int *);
364 extern int find_overload_match (struct type
**arg_types
, int nargs
,
365 char *name
, int method
, int lax
,
366 struct value
**objp
, struct symbol
*fsym
,
367 struct value
**valp
, struct symbol
**symp
,
370 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
372 extern struct value
*value_primitive_field (struct value
*arg1
, int offset
,
374 struct type
*arg_type
);
377 extern struct type
*value_rtti_target_type (struct value
*, int *, int *,
380 extern struct value
*value_full_object (struct value
*, struct type
*, int,
383 extern struct value
*value_cast_pointers (struct type
*, struct value
*);
385 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
387 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
389 extern struct value
*value_repeat (struct value
*arg1
, int count
);
391 extern struct value
*value_subscript (struct value
*array
, struct value
*idx
);
393 extern struct value
*register_value_being_returned (struct type
*valtype
,
394 struct regcache
*retbuf
);
396 extern struct value
*value_in (struct value
*element
, struct value
*set
);
398 extern int value_bit_index (struct type
*type
, const gdb_byte
*addr
,
401 extern int using_struct_return (struct type
*value_type
, int gcc_p
);
403 extern struct value
*evaluate_expression (struct expression
*exp
);
405 extern struct value
*evaluate_type (struct expression
*exp
);
407 extern struct value
*evaluate_subexp_with_coercion (struct expression
*,
410 extern struct value
*parse_and_eval (char *exp
);
412 extern struct value
*parse_to_comma_and_eval (char **expp
);
414 extern struct type
*parse_and_eval_type (char *p
, int length
);
416 extern CORE_ADDR
parse_and_eval_address (char *exp
);
418 extern CORE_ADDR
parse_and_eval_address_1 (char **expptr
);
420 extern LONGEST
parse_and_eval_long (char *exp
);
422 extern struct value
*access_value_history (int num
);
424 extern struct value
*value_of_internalvar (struct internalvar
*var
);
426 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
428 extern void set_internalvar_component (struct internalvar
*var
,
430 int bitpos
, int bitsize
,
431 struct value
*newvalue
);
433 extern struct internalvar
*lookup_internalvar (char *name
);
435 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
437 extern int value_less (struct value
*arg1
, struct value
*arg2
);
439 extern int value_logical_not (struct value
*arg1
);
443 extern struct value
*value_of_this (int complain
);
445 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
447 enum exp_opcode otherop
,
450 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
453 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
454 int j
, struct type
*type
, int offset
);
456 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
459 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
461 extern int destructor_name_p (const char *name
, const struct type
*type
);
463 #define value_free(val) xfree (val)
465 extern void free_all_values (void);
467 extern void release_value (struct value
*val
);
469 extern int record_latest_value (struct value
*val
);
471 extern void modify_field (gdb_byte
*addr
, LONGEST fieldval
, int bitpos
,
474 extern void type_print (struct type
*type
, char *varstring
,
475 struct ui_file
*stream
, int show
);
477 extern gdb_byte
*baseclass_addr (struct type
*type
, int index
,
479 struct value
**valuep
, int *errp
);
481 extern void print_longest (struct ui_file
*stream
, int format
,
482 int use_local
, LONGEST val
);
484 extern void print_floating (const gdb_byte
*valaddr
, struct type
*type
,
485 struct ui_file
*stream
);
487 extern int value_print (struct value
*val
, struct ui_file
*stream
, int format
,
488 enum val_prettyprint pretty
);
490 extern void value_print_array_elements (struct value
*val
,
491 struct ui_file
*stream
, int format
,
492 enum val_prettyprint pretty
);
494 extern struct value
*value_release_to_mark (struct value
*mark
);
496 extern int val_print (struct type
*type
, const gdb_byte
*valaddr
,
497 int embedded_offset
, CORE_ADDR address
,
498 struct ui_file
*stream
, int format
,
499 int deref_ref
, int recurse
,
500 enum val_prettyprint pretty
);
502 extern int common_val_print (struct value
*val
,
503 struct ui_file
*stream
, int format
,
504 int deref_ref
, int recurse
,
505 enum val_prettyprint pretty
);
507 extern int val_print_string (CORE_ADDR addr
, int len
, int width
,
508 struct ui_file
*stream
);
510 extern void print_variable_value (struct symbol
*var
,
511 struct frame_info
*frame
,
512 struct ui_file
*stream
);
514 extern int check_field (struct value
*, const char *);
516 extern void typedef_print (struct type
*type
, struct symbol
*news
,
517 struct ui_file
*stream
);
519 extern char *internalvar_name (struct internalvar
*var
);
521 extern void preserve_values (struct objfile
*);
525 extern struct value
*value_copy (struct value
*);
529 extern struct value
*varying_to_slice (struct value
*);
531 extern struct value
*value_slice (struct value
*, int, int);
533 extern struct value
*value_literal_complex (struct value
*, struct value
*,
536 extern void find_rt_vbase_offset (struct type
*, struct type
*,
537 const gdb_byte
*, int, int *, int *);
539 extern struct value
*find_function_in_inferior (const char *);
541 extern struct value
*value_allocate_space_in_inferior (int);
543 extern struct value
*value_of_local (const char *name
, int complain
);
545 #endif /* !defined (VALUE_H) */
This page took 0.071558 seconds and 4 git commands to generate.