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git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/value.h
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
);
190 /* If nonzero, this is the value of a variable which does not actually
191 exist in the program. */
192 extern int value_optimized_out (struct value
*value
);
193 extern void set_value_optimized_out (struct value
*value
, int val
);
195 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
196 single value might have multiple LVALs), this hacked interface is
197 limited to just the first PIECE. Expect further change. */
198 /* Type of value; either not an lval, or one of the various different
199 possible kinds of lval. */
200 extern enum lval_type
*deprecated_value_lval_hack (struct value
*);
201 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
203 /* If lval == lval_memory, this is the address in the inferior. If
204 lval == lval_register, this is the byte offset into the registers
206 extern CORE_ADDR
*deprecated_value_address_hack (struct value
*);
207 #define VALUE_ADDRESS(val) (*deprecated_value_address_hack (val))
209 /* Pointer to internal variable. */
210 extern struct internalvar
**deprecated_value_internalvar_hack (struct value
*);
211 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
213 /* Frame register value is relative to. This will be described in the
214 lval enum above as "lval_register". */
215 extern struct frame_id
*deprecated_value_frame_id_hack (struct value
*);
216 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
218 /* Register number if the value is from a register. */
219 extern short *deprecated_value_regnum_hack (struct value
*);
220 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
222 /* Convert a REF to the object referenced. */
224 extern struct value
*coerce_ref (struct value
*value
);
226 /* If ARG is an array, convert it to a pointer.
227 If ARG is an enum, convert it to an integer.
228 If ARG is a function, convert it to a function pointer.
230 References are dereferenced. */
232 extern struct value
*coerce_array (struct value
*value
);
233 extern struct value
*coerce_number (struct value
*value
);
235 /* If ARG is an enum, convert it to an integer. */
237 extern struct value
*coerce_enum (struct value
*value
);
239 /* Internal variables (variables for convenience of use of debugger)
240 are recorded as a chain of these structures. */
244 struct internalvar
*next
;
249 /* Pointer to member function. Depends on compiler implementation. */
251 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
252 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
253 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
257 #include "gdbtypes.h"
258 #include "expression.h"
263 extern void print_address_demangle (CORE_ADDR
, struct ui_file
*, int);
265 extern LONGEST
value_as_long (struct value
*val
);
266 extern DOUBLEST
value_as_double (struct value
*val
);
267 extern CORE_ADDR
value_as_address (struct value
*val
);
269 extern LONGEST
unpack_long (struct type
*type
, const char *valaddr
);
270 extern DOUBLEST
unpack_double (struct type
*type
, const char *valaddr
,
272 extern CORE_ADDR
unpack_pointer (struct type
*type
, const char *valaddr
);
273 extern LONGEST
unpack_field_as_long (struct type
*type
, const char *valaddr
,
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
*value_from_register (struct type
*type
, int regnum
,
285 struct frame_info
*frame
);
287 extern struct value
*value_of_variable (struct symbol
*var
, struct block
*b
);
289 extern struct value
*value_of_register (int regnum
, struct frame_info
*frame
);
291 extern int symbol_read_needs_frame (struct symbol
*);
293 extern struct value
*read_var_value (struct symbol
*var
,
294 struct frame_info
*frame
);
296 extern struct value
*locate_var_value (struct symbol
*var
,
297 struct frame_info
*frame
);
299 extern struct value
*allocate_value (struct type
*type
);
301 extern struct value
*allocate_repeat_value (struct type
*type
, int count
);
303 extern struct value
*value_mark (void);
305 extern void value_free_to_mark (struct value
*mark
);
307 extern struct value
*value_string (char *ptr
, int len
);
308 extern struct value
*value_bitstring (char *ptr
, int len
);
310 extern struct value
*value_array (int lowbound
, int highbound
,
311 struct value
**elemvec
);
313 extern struct value
*value_concat (struct value
*arg1
, struct value
*arg2
);
315 extern struct value
*value_binop (struct value
*arg1
, struct value
*arg2
,
318 extern struct value
*value_add (struct value
*arg1
, struct value
*arg2
);
320 extern struct value
*value_sub (struct value
*arg1
, struct value
*arg2
);
322 extern struct value
*value_coerce_array (struct value
*arg1
);
324 extern struct value
*value_coerce_function (struct value
*arg1
);
326 extern struct value
*value_ind (struct value
*arg1
);
328 extern struct value
*value_addr (struct value
*arg1
);
330 extern struct value
*value_assign (struct value
*toval
,
331 struct value
*fromval
);
333 extern struct value
*value_neg (struct value
*arg1
);
335 extern struct value
*value_complement (struct value
*arg1
);
337 extern struct value
*value_struct_elt (struct value
**argp
,
339 char *name
, int *static_memfuncp
,
342 extern struct value
*value_aggregate_elt (struct type
*curtype
,
343 char *name
, enum noside noside
);
345 extern struct value
*value_static_field (struct type
*type
, int fieldno
);
347 extern struct fn_field
*value_find_oload_method_list (struct value
**, char *,
349 struct type
**, int *);
351 extern int find_overload_match (struct type
**arg_types
, int nargs
,
352 char *name
, int method
, int lax
,
353 struct value
**objp
, struct symbol
*fsym
,
354 struct value
**valp
, struct symbol
**symp
,
357 extern struct value
*value_field (struct value
*arg1
, int fieldno
);
359 extern struct value
*value_primitive_field (struct value
*arg1
, int offset
,
361 struct type
*arg_type
);
364 extern struct type
*value_rtti_target_type (struct value
*, int *, int *,
367 extern struct value
*value_full_object (struct value
*, struct type
*, int,
370 extern struct value
*value_cast (struct type
*type
, struct value
*arg2
);
372 extern struct value
*value_zero (struct type
*type
, enum lval_type lv
);
374 extern struct value
*value_repeat (struct value
*arg1
, int count
);
376 extern struct value
*value_subscript (struct value
*array
, struct value
*idx
);
378 extern struct value
*register_value_being_returned (struct type
*valtype
,
379 struct regcache
*retbuf
);
381 extern struct value
*value_in (struct value
*element
, struct value
*set
);
383 extern int value_bit_index (struct type
*type
, const bfd_byte
*addr
,
386 extern int using_struct_return (struct type
*value_type
, int gcc_p
);
388 extern struct value
*evaluate_expression (struct expression
*exp
);
390 extern struct value
*evaluate_type (struct expression
*exp
);
392 extern struct value
*evaluate_subexp_with_coercion (struct expression
*,
395 extern struct value
*parse_and_eval (char *exp
);
397 extern struct value
*parse_to_comma_and_eval (char **expp
);
399 extern struct type
*parse_and_eval_type (char *p
, int length
);
401 extern CORE_ADDR
parse_and_eval_address (char *exp
);
403 extern CORE_ADDR
parse_and_eval_address_1 (char **expptr
);
405 extern LONGEST
parse_and_eval_long (char *exp
);
407 extern struct value
*access_value_history (int num
);
409 extern struct value
*value_of_internalvar (struct internalvar
*var
);
411 extern void set_internalvar (struct internalvar
*var
, struct value
*val
);
413 extern void set_internalvar_component (struct internalvar
*var
,
415 int bitpos
, int bitsize
,
416 struct value
*newvalue
);
418 extern struct internalvar
*lookup_internalvar (char *name
);
420 extern int value_equal (struct value
*arg1
, struct value
*arg2
);
422 extern int value_less (struct value
*arg1
, struct value
*arg2
);
424 extern int value_logical_not (struct value
*arg1
);
428 extern struct value
*value_of_this (int complain
);
430 extern struct value
*value_x_binop (struct value
*arg1
, struct value
*arg2
,
432 enum exp_opcode otherop
,
435 extern struct value
*value_x_unop (struct value
*arg1
, enum exp_opcode op
,
438 extern struct value
*value_fn_field (struct value
**arg1p
, struct fn_field
*f
,
439 int j
, struct type
*type
, int offset
);
441 extern int binop_user_defined_p (enum exp_opcode op
, struct value
*arg1
,
444 extern int unop_user_defined_p (enum exp_opcode op
, struct value
*arg1
);
446 extern int destructor_name_p (const char *name
, const struct type
*type
);
448 #define value_free(val) xfree (val)
450 extern void free_all_values (void);
452 extern void release_value (struct value
*val
);
454 extern int record_latest_value (struct value
*val
);
456 extern void modify_field (char *addr
, LONGEST fieldval
, int bitpos
,
459 extern void type_print (struct type
*type
, char *varstring
,
460 struct ui_file
*stream
, int show
);
462 extern char *baseclass_addr (struct type
*type
, int index
, char *valaddr
,
463 struct value
**valuep
, int *errp
);
465 extern void print_longest (struct ui_file
*stream
, int format
,
466 int use_local
, LONGEST val
);
468 extern void print_floating (const bfd_byte
*valaddr
, struct type
*type
,
469 struct ui_file
*stream
);
471 extern int value_print (struct value
*val
, struct ui_file
*stream
, int format
,
472 enum val_prettyprint pretty
);
474 extern void value_print_array_elements (struct value
*val
,
475 struct ui_file
*stream
, int format
,
476 enum val_prettyprint pretty
);
478 extern struct value
*value_release_to_mark (struct value
*mark
);
480 extern int val_print (struct type
*type
, const bfd_byte
*valaddr
,
481 int embedded_offset
, CORE_ADDR address
,
482 struct ui_file
*stream
, int format
,
483 int deref_ref
, int recurse
,
484 enum val_prettyprint pretty
);
486 extern int val_print_string (CORE_ADDR addr
, int len
, int width
,
487 struct ui_file
*stream
);
489 extern void print_variable_value (struct symbol
*var
,
490 struct frame_info
*frame
,
491 struct ui_file
*stream
);
493 extern int check_field (struct value
*, const char *);
495 extern void typedef_print (struct type
*type
, struct symbol
*news
,
496 struct ui_file
*stream
);
498 extern char *internalvar_name (struct internalvar
*var
);
500 extern void clear_value_history (void);
502 extern void clear_internalvars (void);
506 extern struct value
*value_copy (struct value
*);
510 extern struct value
*varying_to_slice (struct value
*);
512 extern struct value
*value_slice (struct value
*, int, int);
514 extern struct value
*value_literal_complex (struct value
*, struct value
*,
517 extern void find_rt_vbase_offset (struct type
*, struct type
*,
518 const bfd_byte
*, int, int *, int *);
520 extern struct value
*find_function_in_inferior (const char *);
522 extern struct value
*value_allocate_space_in_inferior (int);
524 extern struct value
*value_of_local (const char *name
, int complain
);
526 #endif /* !defined (VALUE_H) */