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 /* Set or return field indicating whether a variable is initialized or
197 not, based on debugging information supplied by the compiler.
198 1 = initialized; 0 = uninitialized. */
199 extern int value_initialized (struct value
*);
200 extern void set_value_initialized (struct value
*, int);
202 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
203 single value might have multiple LVALs), this hacked interface is
204 limited to just the first PIECE. Expect further change. */
205 /* Type of value; either not an lval, or one of the various different
206 possible kinds of lval. */
207 extern enum lval_type
*deprecated_value_lval_hack (struct value
*);
208 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
210 /* If lval == lval_memory, this is the address in the inferior. If
211 lval == lval_register, this is the byte offset into the registers
213 extern CORE_ADDR
*deprecated_value_address_hack (struct value
*);
214 #define VALUE_ADDRESS(val) (*deprecated_value_address_hack (val))
216 /* Pointer to internal variable. */
217 extern struct internalvar
**deprecated_value_internalvar_hack (struct value
*);
218 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
220 /* Frame register value is relative to. This will be described in the
221 lval enum above as "lval_register". */
222 extern struct frame_id
*deprecated_value_frame_id_hack (struct value
*);
223 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
225 /* Register number if the value is from a register. */
226 extern short *deprecated_value_regnum_hack (struct value
*);
227 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
229 /* Convert a REF to the object referenced. */
231 extern struct value
*coerce_ref (struct value
*value
);
233 /* If ARG is an array, convert it to a pointer.
234 If ARG is an enum, convert it to an integer.
235 If ARG is a function, convert it to a function pointer.
237 References are dereferenced. */
239 extern struct value
*coerce_array (struct value
*value
);
240 extern struct value
*coerce_number (struct value
*value
);
242 /* If ARG is an enum, convert it to an integer. */
244 extern struct value
*coerce_enum (struct value
*value
);
246 /* Internal variables (variables for convenience of use of debugger)
247 are recorded as a chain of these structures. */
251 struct internalvar
*next
;
260 #include "gdbtypes.h"
261 #include "expression.h"
266 extern void print_address_demangle (CORE_ADDR
, struct ui_file
*, int);
268 extern LONGEST
value_as_long (struct value
*val
);
269 extern DOUBLEST
value_as_double (struct value
*val
);
270 extern CORE_ADDR
value_as_address (struct value
*val
);
272 extern LONGEST
unpack_long (struct type
*type
, const gdb_byte
*valaddr
);
273 extern DOUBLEST
unpack_double (struct type
*type
, const gdb_byte
*valaddr
,
275 extern CORE_ADDR
unpack_pointer (struct type
*type
, const gdb_byte
*valaddr
);
276 extern LONGEST
unpack_field_as_long (struct type
*type
,
277 const gdb_byte
*valaddr
,
280 extern void pack_long (gdb_byte
*buf
, struct type
*type
, LONGEST num
);
282 extern struct value
*value_from_longest (struct type
*type
, LONGEST num
);
283 extern struct value
*value_from_pointer (struct type
*type
, CORE_ADDR addr
);
284 extern struct value
*value_from_double (struct type
*type
, DOUBLEST num
);
285 extern struct value
*value_from_string (char *string
);
287 extern struct value
*value_at (struct type
*type
, CORE_ADDR addr
);
288 extern struct value
*value_at_lazy (struct type
*type
, CORE_ADDR addr
);
290 extern struct value
*default_value_from_register (struct type
*type
,
292 struct frame_info
*frame
);
294 extern struct value
*value_from_register (struct type
*type
, int regnum
,
295 struct frame_info
*frame
);
297 extern CORE_ADDR
address_from_register (struct type
*type
, int regnum
,
298 struct frame_info
*frame
);
300 extern struct value
*value_of_variable (struct symbol
*var
, struct block
*b
);
302 extern struct value
*value_of_register (int regnum
, struct frame_info
*frame
);
304 extern int symbol_read_needs_frame (struct symbol
*);
306 extern struct value
*read_var_value (struct symbol
*var
,
307 struct frame_info
*frame
);
309 extern struct value
*locate_var_value (struct symbol
*var
,
310 struct frame_info
*frame
);
312 extern struct value
*allocate_value (struct type
*type
);
314 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
316 extern struct value
*value_mark (void);
318 extern void value_free_to_mark (struct value
*mark
);
320 extern struct value
*value_string (char *ptr
, int len
);
321 extern struct value
*value_bitstring (char *ptr
, int len
);
323 extern struct value
*value_array (int lowbound
, int highbound
,
324 struct value
**elemvec
);
326 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
328 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
331 extern struct value
*value_add (struct value
*arg1
, struct value
*arg2
);
333 extern struct value
*value_sub (struct value
*arg1
, struct value
*arg2
);
335 extern struct value
*value_coerce_array (struct value
*arg1
);
337 extern struct value
*value_coerce_function (struct value
*arg1
);
339 extern struct value
*value_ind (struct value
*arg1
);
341 extern struct value
*value_addr (struct value
*arg1
);
343 extern struct value
*value_ref (struct value
*arg1
);
345 extern struct value
*value_assign (struct value
*toval
,
346 struct value
*fromval
);
348 extern struct value
*value_pos (struct value
*arg1
);
350 extern struct value
*value_neg (struct value
*arg1
);
352 extern struct value
*value_complement (struct value
*arg1
);
354 extern struct value
*value_struct_elt (struct value
**argp
,
356 char *name
, int *static_memfuncp
,
359 extern struct value
*value_aggregate_elt (struct type
*curtype
,
364 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
366 extern struct fn_field
*value_find_oload_method_list (struct value
**, char *,
368 struct type
**, int *);
370 extern int find_overload_match (struct type
**arg_types
, int nargs
,
371 char *name
, int method
, int lax
,
372 struct value
**objp
, struct symbol
*fsym
,
373 struct value
**valp
, struct symbol
**symp
,
376 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
378 extern struct value
*value_primitive_field (struct value
*arg1
, int offset
,
380 struct type
*arg_type
);
383 extern struct type
*value_rtti_target_type (struct value
*, int *, int *,
386 extern struct value
*value_full_object (struct value
*, struct type
*, int,
389 extern struct value
*value_cast_pointers (struct type
*, struct value
*);
391 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
393 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
395 extern struct value
*value_repeat (struct value
*arg1
, int count
);
397 extern struct value
*value_subscript (struct value
*array
, struct value
*idx
);
399 extern struct value
*register_value_being_returned (struct type
*valtype
,
400 struct regcache
*retbuf
);
402 extern struct value
*value_in (struct value
*element
, struct value
*set
);
404 extern int value_bit_index (struct type
*type
, const gdb_byte
*addr
,
407 extern int using_struct_return (struct type
*value_type
, int gcc_p
);
409 extern struct value
*evaluate_expression (struct expression
*exp
);
411 extern struct value
*evaluate_type (struct expression
*exp
);
413 extern struct value
*evaluate_subexp_with_coercion (struct expression
*,
416 extern struct value
*parse_and_eval (char *exp
);
418 extern struct value
*parse_to_comma_and_eval (char **expp
);
420 extern struct type
*parse_and_eval_type (char *p
, int length
);
422 extern CORE_ADDR
parse_and_eval_address (char *exp
);
424 extern CORE_ADDR
parse_and_eval_address_1 (char **expptr
);
426 extern LONGEST
parse_and_eval_long (char *exp
);
428 extern struct value
*access_value_history (int num
);
430 extern struct value
*value_of_internalvar (struct internalvar
*var
);
432 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
434 extern void set_internalvar_component (struct internalvar
*var
,
436 int bitpos
, int bitsize
,
437 struct value
*newvalue
);
439 extern struct internalvar
*lookup_internalvar (char *name
);
441 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
443 extern int value_less (struct value
*arg1
, struct value
*arg2
);
445 extern int value_logical_not (struct value
*arg1
);
449 extern struct value
*value_of_this (int complain
);
451 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
453 enum exp_opcode otherop
,
456 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
459 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
460 int j
, struct type
*type
, int offset
);
462 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
465 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
467 extern int destructor_name_p (const char *name
, const struct type
*type
);
469 #define value_free(val) xfree (val)
471 extern void free_all_values (void);
473 extern void release_value (struct value
*val
);
475 extern int record_latest_value (struct value
*val
);
477 extern void modify_field (gdb_byte
*addr
, LONGEST fieldval
, int bitpos
,
480 extern void type_print (struct type
*type
, char *varstring
,
481 struct ui_file
*stream
, int show
);
483 extern gdb_byte
*baseclass_addr (struct type
*type
, int index
,
485 struct value
**valuep
, int *errp
);
487 extern void print_longest (struct ui_file
*stream
, int format
,
488 int use_local
, LONGEST val
);
490 extern void print_floating (const gdb_byte
*valaddr
, struct type
*type
,
491 struct ui_file
*stream
);
493 extern int value_print (struct value
*val
, struct ui_file
*stream
, int format
,
494 enum val_prettyprint pretty
);
496 extern void value_print_array_elements (struct value
*val
,
497 struct ui_file
*stream
, int format
,
498 enum val_prettyprint pretty
);
500 extern struct value
*value_release_to_mark (struct value
*mark
);
502 extern int val_print (struct type
*type
, const gdb_byte
*valaddr
,
503 int embedded_offset
, CORE_ADDR address
,
504 struct ui_file
*stream
, int format
,
505 int deref_ref
, int recurse
,
506 enum val_prettyprint pretty
);
508 extern int common_val_print (struct value
*val
,
509 struct ui_file
*stream
, int format
,
510 int deref_ref
, int recurse
,
511 enum val_prettyprint pretty
);
513 extern int val_print_string (CORE_ADDR addr
, int len
, int width
,
514 struct ui_file
*stream
);
516 extern void print_variable_value (struct symbol
*var
,
517 struct frame_info
*frame
,
518 struct ui_file
*stream
);
520 extern int check_field (struct value
*, const char *);
522 extern void typedef_print (struct type
*type
, struct symbol
*news
,
523 struct ui_file
*stream
);
525 extern char *internalvar_name (struct internalvar
*var
);
527 extern void preserve_values (struct objfile
*);
531 extern struct value
*value_copy (struct value
*);
535 extern struct value
*varying_to_slice (struct value
*);
537 extern struct value
*value_slice (struct value
*, int, int);
539 extern struct value
*value_literal_complex (struct value
*, struct value
*,
542 extern void find_rt_vbase_offset (struct type
*, struct type
*,
543 const gdb_byte
*, int, int *, int *);
545 extern struct value
*find_function_in_inferior (const char *);
547 extern struct value
*value_allocate_space_in_inferior (int);
549 extern struct value
*value_of_local (const char *name
, int complain
);
551 #endif /* !defined (VALUE_H) */
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