1 /* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
3 1996, 1997, 1998, 1999, 2000, 2001
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 #if !defined (VALUE_H)
27 * The structure which defines the type of a value. It should never
28 * be possible for a program lval value to survive over a call to the inferior
29 * (ie to be put into the history list or an internal variable).
34 /* Type of value; either not an lval, or one of the various
35 different possible kinds of lval. */
37 /* Is it modifiable? Only relevant if lval != not_lval. */
39 /* Location of value (if lval). */
42 /* If lval == lval_memory, this is the address in the inferior.
43 If lval == lval_register, this is the byte offset into the
44 registers structure. */
46 /* Pointer to internal variable. */
47 struct internalvar
*internalvar
;
48 /* Number of register. Only used with
49 lval_reg_frame_relative. */
53 /* Describes offset of a value within lval of a structure in bytes.
54 If lval == lval_memory, this is an offset to the address.
55 If lval == lval_register, this is a further offset from
56 location.address within the registers structure.
57 Note also the member embedded_offset below. */
59 /* Only used for bitfields; number of bits contained in them. */
61 /* Only used for bitfields; position of start of field.
62 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
63 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
65 /* Frame value is relative to. In practice, this address is only
66 used if the value is stored in several registers in other than
67 the current frame, and these registers have not all been saved
68 at the same place in memory. This will be described in the
69 lval enum above as "lval_reg_frame_relative". */
71 /* Type of the value. */
73 /* Type of the enclosing object if this is an embedded subobject.
74 The member embedded_offset gives the real position of the subobject
75 if type is not the same as enclosing_type.
77 If the type field is a pointer type, then enclosing_type is
78 a pointer type pointing to the real (enclosing) type of the target
80 struct type
*enclosing_type
;
81 /* Values are stored in a chain, so that they can be deleted
82 easily over calls to the inferior. Values assigned to internal
83 variables or put into the value history are taken off this
87 /* ??? When is this used? */
95 /* Register number if the value is from a register. Is not kept
96 if you take a field of a structure that is stored in a
97 register. Shouldn't it be? */
99 /* If zero, contents of this value are in the contents field.
100 If nonzero, contents are in inferior memory at address
101 in the location.address field plus the offset field
102 (and the lval field should be lval_memory).
104 WARNING: This field is used by the code which handles
105 watchpoints (see breakpoint.c) to decide whether a particular
106 value can be watched by hardware watchpoints. If the lazy flag
107 is set for some member of a value chain, it is assumed that
108 this member of the chain doesn't need to be watched as part of
109 watching the value itself. This is how GDB avoids watching the
110 entire struct or array when the user wants to watch a single
111 struct member or array element. If you ever change the way
112 lazy flag is set and reset, be sure to consider this use as
115 /* If nonzero, this is the value of a variable which does not
116 actually exist in the program. */
118 /* If this value represents an object that is embedded inside a
119 larger object (e.g., a base subobject in C++), this gives the
120 offset (in bytes) from the start of the contents buffer where
121 the embedded object begins. This is required because some C++
122 runtime implementations lay out objects (especially virtual bases
123 with possibly negative offsets to ancestors).
124 Note: This may be positive or negative! Also note that this offset
125 is not used when retrieving contents from target memory; the entire
126 enclosing object has to be retrieved always, and the offset for
127 that is given by the member offset above. */
129 /* If this value represents a pointer to an object that is embedded
130 in another object, this gives the embedded_offset of the object
131 that is pointed to. */
132 int pointed_to_offset
;
133 /* The BFD section associated with this value. */
134 asection
*bfd_section
;
135 /* Actual contents of the value. For use of this value; setting
136 it uses the stuff above. Not valid if lazy is nonzero.
137 Target byte-order. We force it to be aligned properly for any
138 possible value. Note that a value therefore extends beyond
139 what is declared here. */
143 double force_double_align
;
144 LONGEST force_longlong_align
;
148 /* Do not add any new members here -- contents above will trash them */
151 typedef struct value
*value_ptr
;
153 #define VALUE_TYPE(val) (val)->type
154 #define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
155 #define VALUE_LAZY(val) (val)->lazy
156 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
157 the gdb buffer used to hold a copy of the contents of the lval.
158 VALUE_CONTENTS is used when the contents of the buffer are needed --
159 it uses value_fetch_lazy() to load the buffer from the process being
160 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
161 used when data is being stored into the buffer, or when it is
162 certain that the contents of the buffer are valid.
163 Note: The contents pointer is adjusted by the offset required to
164 get to the real subobject, if the value happens to represent
165 something embedded in a larger run-time object. */
167 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
168 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
169 VALUE_CONTENTS_RAW(val))
171 /* The ALL variants of the above two macros do not adjust the returned
172 pointer by the embedded_offset value. */
174 #define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
175 #define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
176 VALUE_CONTENTS_ALL_RAW(val))
179 extern int value_fetch_lazy (value_ptr val
);
181 #define VALUE_LVAL(val) (val)->lval
182 #define VALUE_ADDRESS(val) (val)->location.address
183 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
184 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
185 #define VALUE_FRAME(val) ((val)->frame_addr)
186 #define VALUE_OFFSET(val) (val)->offset
187 #define VALUE_BITSIZE(val) (val)->bitsize
188 #define VALUE_BITPOS(val) (val)->bitpos
189 #define VALUE_NEXT(val) (val)->next
190 #define VALUE_REGNO(val) (val)->regno
191 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
192 #define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
193 #define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
194 #define VALUE_BFD_SECTION(val) ((val)->bfd_section)
196 /* Convert a REF to the object referenced. */
198 #define COERCE_REF(arg) \
199 do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
200 if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
201 arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
202 unpack_pointer (VALUE_TYPE (arg), \
203 VALUE_CONTENTS (arg)), \
204 VALUE_BFD_SECTION (arg)); \
207 /* If ARG is an array, convert it to a pointer.
208 If ARG is an enum, convert it to an integer.
209 If ARG is a function, convert it to a function pointer.
211 References are dereferenced. */
213 #define COERCE_ARRAY(arg) \
214 do { COERCE_REF(arg); \
215 if (current_language->c_style_arrays \
216 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
217 arg = value_coerce_array (arg); \
218 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
219 arg = value_coerce_function (arg); \
222 #define COERCE_NUMBER(arg) \
223 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
225 #define COERCE_VARYING_ARRAY(arg, real_arg_type) \
226 { if (chill_varying_type (real_arg_type)) \
227 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
229 /* If ARG is an enum, convert it to an integer. */
231 #define COERCE_ENUM(arg) { \
232 if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM) \
233 arg = value_cast (builtin_type_unsigned_int, arg); \
236 /* Internal variables (variables for convenience of use of debugger)
237 are recorded as a chain of these structures. */
241 struct internalvar
*next
;
246 /* Pointer to member function. Depends on compiler implementation. */
248 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
249 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
250 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
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 (value_ptr val
);
264 extern DOUBLEST
value_as_double (value_ptr val
);
266 extern CORE_ADDR
value_as_pointer (value_ptr val
);
268 extern LONGEST
unpack_long (struct type
*type
, char *valaddr
);
270 extern DOUBLEST
unpack_double (struct type
*type
, char *valaddr
, int *invp
);
272 extern CORE_ADDR
unpack_pointer (struct type
*type
, char *valaddr
);
274 extern LONGEST
unpack_field_as_long (struct type
*type
, char *valaddr
,
277 extern value_ptr
value_from_longest (struct type
*type
, LONGEST num
);
279 extern value_ptr
value_from_pointer (struct type
*type
, CORE_ADDR addr
);
281 extern value_ptr
value_from_double (struct type
*type
, DOUBLEST num
);
283 extern value_ptr
value_from_string (char *string
);
285 extern value_ptr
value_at (struct type
*type
, CORE_ADDR addr
,
288 extern value_ptr
value_at_lazy (struct type
*type
, CORE_ADDR addr
,
291 extern value_ptr
value_from_register (struct type
*type
, int regnum
,
292 struct frame_info
*frame
);
294 extern value_ptr
value_of_variable (struct symbol
*var
, struct block
*b
);
296 extern value_ptr
value_of_register (int regnum
);
298 extern int symbol_read_needs_frame (struct symbol
*);
300 extern value_ptr
read_var_value (struct symbol
*var
,
301 struct frame_info
*frame
);
303 extern value_ptr
locate_var_value (struct symbol
*var
,
304 struct frame_info
*frame
);
306 extern value_ptr
allocate_value (struct type
*type
);
308 extern value_ptr
allocate_repeat_value (struct type
*type
, int count
);
310 extern value_ptr
value_mark (void);
312 extern void value_free_to_mark (value_ptr mark
);
314 extern value_ptr
value_string (char *ptr
, int len
);
315 extern value_ptr
value_bitstring (char *ptr
, int len
);
317 extern value_ptr
value_array (int lowbound
, int highbound
,
318 value_ptr
* elemvec
);
320 extern value_ptr
value_concat (value_ptr arg1
, value_ptr arg2
);
322 extern value_ptr
value_binop (value_ptr arg1
, value_ptr arg2
,
325 extern value_ptr
value_add (value_ptr arg1
, value_ptr arg2
);
327 extern value_ptr
value_sub (value_ptr arg1
, value_ptr arg2
);
329 extern value_ptr
value_coerce_array (value_ptr arg1
);
331 extern value_ptr
value_coerce_function (value_ptr arg1
);
333 extern value_ptr
value_ind (value_ptr arg1
);
335 extern value_ptr
value_addr (value_ptr arg1
);
337 extern value_ptr
value_assign (value_ptr toval
, value_ptr fromval
);
339 extern value_ptr
value_neg (value_ptr arg1
);
341 extern value_ptr
value_complement (value_ptr arg1
);
343 extern value_ptr
value_struct_elt (value_ptr
* argp
, value_ptr
* args
,
345 int *static_memfuncp
, char *err
);
347 extern value_ptr
value_struct_elt_for_reference (struct type
*domain
,
349 struct type
*curtype
,
351 struct type
*intype
);
353 extern value_ptr
value_static_field (struct type
*type
, int fieldno
);
355 extern struct fn_field
*value_find_oload_method_list (value_ptr
*, char *,
357 struct type
**, int *);
359 extern int find_overload_match (struct type
**arg_types
, int nargs
,
360 char *name
, int method
, int lax
,
361 value_ptr obj
, struct symbol
*fsym
,
362 value_ptr
* valp
, struct symbol
**symp
,
365 extern value_ptr
value_field (value_ptr arg1
, int fieldno
);
367 extern value_ptr
value_primitive_field (value_ptr arg1
, int offset
,
368 int fieldno
, struct type
*arg_type
);
370 extern struct type
*value_rtti_type (value_ptr
, int *, int *, int *);
372 extern struct type
*value_rtti_target_type (value_ptr
, int *, int *, int *);
374 extern value_ptr
value_full_object (value_ptr
, struct type
*, int, int, int);
376 extern value_ptr
value_cast (struct type
*type
, value_ptr arg2
);
378 extern value_ptr
value_zero (struct type
*type
, enum lval_type lv
);
380 extern value_ptr
value_repeat (value_ptr arg1
, int count
);
382 extern value_ptr
value_subscript (value_ptr array
, value_ptr idx
);
384 extern value_ptr
value_from_vtable_info (value_ptr arg
, struct type
*type
);
386 extern value_ptr
value_being_returned (struct type
*valtype
,
387 char *retbuf
, int struct_return
);
389 extern value_ptr
value_in (value_ptr element
, value_ptr set
);
391 extern int value_bit_index (struct type
*type
, char *addr
, int index
);
393 extern int using_struct_return (value_ptr function
, CORE_ADDR funcaddr
,
394 struct type
*value_type
, int gcc_p
);
396 extern void set_return_value (value_ptr val
);
398 extern value_ptr
evaluate_expression (struct expression
*exp
);
400 extern value_ptr
evaluate_type (struct expression
*exp
);
402 extern value_ptr
evaluate_subexp_with_coercion (struct expression
*,
405 extern value_ptr
parse_and_eval (char *exp
);
407 extern value_ptr
parse_to_comma_and_eval (char **expp
);
409 extern struct type
*parse_and_eval_type (char *p
, int length
);
411 extern CORE_ADDR
parse_and_eval_address (char *exp
);
413 extern CORE_ADDR
parse_and_eval_address_1 (char **expptr
);
415 extern LONGEST
parse_and_eval_long (char *exp
);
417 extern value_ptr
access_value_history (int num
);
419 extern value_ptr
value_of_internalvar (struct internalvar
*var
);
421 extern void set_internalvar (struct internalvar
*var
, value_ptr val
);
423 extern void set_internalvar_component (struct internalvar
*var
,
425 int bitpos
, int bitsize
,
428 extern struct internalvar
*lookup_internalvar (char *name
);
430 extern int value_equal (value_ptr arg1
, value_ptr arg2
);
432 extern int value_less (value_ptr arg1
, value_ptr arg2
);
434 extern int value_logical_not (value_ptr arg1
);
438 extern value_ptr
value_of_this (int complain
);
440 extern value_ptr
value_x_binop (value_ptr arg1
, value_ptr arg2
,
442 enum exp_opcode otherop
, enum noside noside
);
444 extern value_ptr
value_x_unop (value_ptr arg1
, enum exp_opcode op
,
447 extern value_ptr
value_fn_field (value_ptr
* arg1p
, struct fn_field
*f
,
448 int j
, struct type
*type
, int offset
);
450 extern value_ptr
value_virtual_fn_field (value_ptr
* arg1p
,
451 struct fn_field
*f
, int j
,
452 struct type
*type
, int offset
);
454 extern int binop_user_defined_p (enum exp_opcode op
,
455 value_ptr arg1
, value_ptr arg2
);
457 extern int unop_user_defined_p (enum exp_opcode op
, value_ptr arg1
);
459 extern int destructor_name_p (const char *name
, const struct type
*type
);
461 #define value_free(val) xfree (val)
463 extern void free_all_values (void);
465 extern void release_value (value_ptr val
);
467 extern int record_latest_value (value_ptr val
);
470 modify_field (char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
);
472 extern void type_print (struct type
* type
, char *varstring
,
473 struct ui_file
* stream
, int show
);
475 extern char *baseclass_addr (struct type
*type
, int index
,
476 char *valaddr
, value_ptr
* valuep
, int *errp
);
478 extern void print_longest (struct ui_file
* stream
, int format
,
479 int use_local
, LONGEST val
);
481 extern void print_floating (char *valaddr
, struct type
* type
,
482 struct ui_file
* stream
);
484 extern int value_print (value_ptr val
, struct ui_file
*stream
, int format
,
485 enum val_prettyprint pretty
);
487 extern void value_print_array_elements (value_ptr val
,
488 struct ui_file
*stream
,
490 enum val_prettyprint pretty
);
492 extern value_ptr
value_release_to_mark (value_ptr mark
);
494 extern int val_print (struct type
* type
, char *valaddr
,
495 int embedded_offset
, CORE_ADDR address
,
496 struct ui_file
* stream
, int format
,
497 int deref_ref
, int recurse
,
498 enum val_prettyprint pretty
);
500 extern int val_print_string (CORE_ADDR addr
, int len
, int width
, struct ui_file
*stream
);
502 extern void print_variable_value (struct symbol
* var
,
503 struct frame_info
* frame
,
504 struct ui_file
*stream
);
506 extern int check_field (value_ptr
, const char *);
508 extern void typedef_print (struct type
* type
, struct symbol
* news
,
509 struct ui_file
* stream
);
511 extern char *internalvar_name (struct internalvar
*var
);
513 extern void clear_value_history (void);
515 extern void clear_internalvars (void);
519 extern value_ptr
value_copy (value_ptr
);
521 extern int baseclass_offset (struct type
*, int, char *, CORE_ADDR
);
525 extern value_ptr
varying_to_slice (value_ptr
);
527 extern value_ptr
value_slice (value_ptr
, int, int);
529 extern value_ptr
call_function_by_hand (value_ptr
, int, value_ptr
*);
531 extern int default_coerce_float_to_double (struct type
*, struct type
*);
533 extern int standard_coerce_float_to_double (struct type
*, struct type
*);
535 extern value_ptr
value_literal_complex (value_ptr
, value_ptr
, struct type
*);
537 extern void find_rt_vbase_offset (struct type
*, struct type
*, char *, int,
540 extern value_ptr
find_function_in_inferior (char *);
542 extern value_ptr
value_allocate_space_in_inferior (int);
544 extern CORE_ADDR
default_push_arguments (int nargs
, value_ptr
* args
,
547 CORE_ADDR struct_addr
);
549 #endif /* !defined (VALUE_H) */