1 /* Definitions for values of C expressions, for GDB.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, 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 bfd_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 bfd_byte
*value_contents (struct value
*);
180 extern bfd_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 bfd_byte
*value_contents_all_raw (struct value
*);
186 extern const bfd_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
;
253 #include "gdbtypes.h"
254 #include "expression.h"
259 extern void print_address_demangle (CORE_ADDR
, struct ui_file
*, int);
261 extern LONGEST
value_as_long (struct value
*val
);
262 extern DOUBLEST
value_as_double (struct value
*val
);
263 extern CORE_ADDR
value_as_address (struct value
*val
);
265 extern LONGEST
unpack_long (struct type
*type
, const char *valaddr
);
266 extern DOUBLEST
unpack_double (struct type
*type
, const char *valaddr
,
268 extern CORE_ADDR
unpack_pointer (struct type
*type
, const char *valaddr
);
269 extern LONGEST
unpack_field_as_long (struct type
*type
, const char *valaddr
,
272 extern struct value
*value_from_longest (struct type
*type
, LONGEST num
);
273 extern struct value
*value_from_pointer (struct type
*type
, CORE_ADDR addr
);
274 extern struct value
*value_from_double (struct type
*type
, DOUBLEST num
);
275 extern struct value
*value_from_string (char *string
);
277 extern struct value
*value_at (struct type
*type
, CORE_ADDR addr
);
278 extern struct value
*value_at_lazy (struct type
*type
, CORE_ADDR addr
);
280 extern struct value
*value_from_register (struct type
*type
, int regnum
,
281 struct frame_info
*frame
);
283 extern struct value
*value_of_variable (struct symbol
*var
, struct block
*b
);
285 extern struct value
*value_of_register (int regnum
, struct frame_info
*frame
);
287 extern int symbol_read_needs_frame (struct symbol
*);
289 extern struct value
*read_var_value (struct symbol
*var
,
290 struct frame_info
*frame
);
292 extern struct value
*locate_var_value (struct symbol
*var
,
293 struct frame_info
*frame
);
295 extern struct value
*allocate_value (struct type
*type
);
297 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
299 extern struct value
*value_mark (void);
301 extern void value_free_to_mark (struct value
*mark
);
303 extern struct value
*value_string (char *ptr
, int len
);
304 extern struct value
*value_bitstring (char *ptr
, int len
);
306 extern struct value
*value_array (int lowbound
, int highbound
,
307 struct value
**elemvec
);
309 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
311 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
314 extern struct value
*value_add (struct value
*arg1
, struct value
*arg2
);
316 extern struct value
*value_sub (struct value
*arg1
, struct value
*arg2
);
318 extern struct value
*value_coerce_array (struct value
*arg1
);
320 extern struct value
*value_coerce_function (struct value
*arg1
);
322 extern struct value
*value_ind (struct value
*arg1
);
324 extern struct value
*value_addr (struct value
*arg1
);
326 extern struct value
*value_assign (struct value
*toval
,
327 struct value
*fromval
);
329 extern struct value
*value_pos (struct value
*arg1
);
331 extern struct value
*value_neg (struct value
*arg1
);
333 extern struct value
*value_complement (struct value
*arg1
);
335 extern struct value
*value_struct_elt (struct value
**argp
,
337 char *name
, int *static_memfuncp
,
340 extern struct value
*value_aggregate_elt (struct type
*curtype
,
341 char *name
, enum noside noside
);
343 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
345 extern struct fn_field
*value_find_oload_method_list (struct value
**, char *,
347 struct type
**, int *);
349 extern int find_overload_match (struct type
**arg_types
, int nargs
,
350 char *name
, int method
, int lax
,
351 struct value
**objp
, struct symbol
*fsym
,
352 struct value
**valp
, struct symbol
**symp
,
355 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
357 extern struct value
*value_primitive_field (struct value
*arg1
, int offset
,
359 struct type
*arg_type
);
362 extern struct type
*value_rtti_target_type (struct value
*, int *, int *,
365 extern struct value
*value_full_object (struct value
*, struct type
*, int,
368 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
370 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
372 extern struct value
*value_repeat (struct value
*arg1
, int count
);
374 extern struct value
*value_subscript (struct value
*array
, struct value
*idx
);
376 extern struct value
*register_value_being_returned (struct type
*valtype
,
377 struct regcache
*retbuf
);
379 extern struct value
*value_in (struct value
*element
, struct value
*set
);
381 extern int value_bit_index (struct type
*type
, const bfd_byte
*addr
,
384 extern int using_struct_return (struct type
*value_type
, int gcc_p
);
386 extern struct value
*evaluate_expression (struct expression
*exp
);
388 extern struct value
*evaluate_type (struct expression
*exp
);
390 extern struct value
*evaluate_subexp_with_coercion (struct expression
*,
393 extern struct value
*parse_and_eval (char *exp
);
395 extern struct value
*parse_to_comma_and_eval (char **expp
);
397 extern struct type
*parse_and_eval_type (char *p
, int length
);
399 extern CORE_ADDR
parse_and_eval_address (char *exp
);
401 extern CORE_ADDR
parse_and_eval_address_1 (char **expptr
);
403 extern LONGEST
parse_and_eval_long (char *exp
);
405 extern struct value
*access_value_history (int num
);
407 extern struct value
*value_of_internalvar (struct internalvar
*var
);
409 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
411 extern void set_internalvar_component (struct internalvar
*var
,
413 int bitpos
, int bitsize
,
414 struct value
*newvalue
);
416 extern struct internalvar
*lookup_internalvar (char *name
);
418 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
420 extern int value_less (struct value
*arg1
, struct value
*arg2
);
422 extern int value_logical_not (struct value
*arg1
);
426 extern struct value
*value_of_this (int complain
);
428 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
430 enum exp_opcode otherop
,
433 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
436 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
437 int j
, struct type
*type
, int offset
);
439 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
442 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
444 extern int destructor_name_p (const char *name
, const struct type
*type
);
446 #define value_free(val) xfree (val)
448 extern void free_all_values (void);
450 extern void release_value (struct value
*val
);
452 extern int record_latest_value (struct value
*val
);
454 extern void modify_field (char *addr
, LONGEST fieldval
, int bitpos
,
457 extern void type_print (struct type
*type
, char *varstring
,
458 struct ui_file
*stream
, int show
);
460 extern char *baseclass_addr (struct type
*type
, int index
, char *valaddr
,
461 struct value
**valuep
, int *errp
);
463 extern void print_longest (struct ui_file
*stream
, int format
,
464 int use_local
, LONGEST val
);
466 extern void print_floating (const bfd_byte
*valaddr
, struct type
*type
,
467 struct ui_file
*stream
);
469 extern int value_print (struct value
*val
, struct ui_file
*stream
, int format
,
470 enum val_prettyprint pretty
);
472 extern void value_print_array_elements (struct value
*val
,
473 struct ui_file
*stream
, int format
,
474 enum val_prettyprint pretty
);
476 extern struct value
*value_release_to_mark (struct value
*mark
);
478 extern int val_print (struct type
*type
, const bfd_byte
*valaddr
,
479 int embedded_offset
, CORE_ADDR address
,
480 struct ui_file
*stream
, int format
,
481 int deref_ref
, int recurse
,
482 enum val_prettyprint pretty
);
484 extern int common_val_print (struct value
*val
,
485 struct ui_file
*stream
, int format
,
486 int deref_ref
, int recurse
,
487 enum val_prettyprint pretty
);
489 extern int val_print_string (CORE_ADDR addr
, int len
, int width
,
490 struct ui_file
*stream
);
492 extern void print_variable_value (struct symbol
*var
,
493 struct frame_info
*frame
,
494 struct ui_file
*stream
);
496 extern int check_field (struct value
*, const char *);
498 extern void typedef_print (struct type
*type
, struct symbol
*news
,
499 struct ui_file
*stream
);
501 extern char *internalvar_name (struct internalvar
*var
);
503 extern void clear_value_history (void);
505 extern void clear_internalvars (void);
509 extern struct value
*value_copy (struct value
*);
513 extern struct value
*varying_to_slice (struct value
*);
515 extern struct value
*value_slice (struct value
*, int, int);
517 extern struct value
*value_literal_complex (struct value
*, struct value
*,
520 extern void find_rt_vbase_offset (struct type
*, struct type
*,
521 const bfd_byte
*, int, int *, int *);
523 extern struct value
*find_function_in_inferior (const char *);
525 extern struct value
*value_allocate_space_in_inferior (int);
527 extern struct value
*value_of_local (const char *name
, int complain
);
529 #endif /* !defined (VALUE_H) */
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