1 /* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 #if !defined (VALUE_H)
25 * The structure which defines the type of a value. It should never
26 * be possible for a program lval value to survive over a call to the inferior
27 * (ie to be put into the history list or an internal variable).
32 /* In memory. Could be a saved register. */
36 /* In a gdb internal variable. */
38 /* Part of a gdb internal variable (structure field). */
39 lval_internalvar_component
,
40 /* In a register series in a frame not the current one, which may have been
41 partially saved or saved in different places (otherwise would be
42 lval_register or lval_memory). */
43 lval_reg_frame_relative
48 /* Type of value; either not an lval, or one of the various
49 different possible kinds of lval. */
51 /* Is it modifiable? Only relevant if lval != not_lval. */
53 /* Location of value (if lval). */
56 /* Address in inferior or byte of registers structure. */
58 /* Pointer to internal variable. */
59 struct internalvar
*internalvar
;
60 /* Number of register. Only used with
61 lval_reg_frame_relative. */
64 /* Describes offset of a value within lval of a structure in bytes.
65 This is used in retrieving contents from target memory. [Note also
66 the member embedded_offset below.] */
68 /* Only used for bitfields; number of bits contained in them. */
70 /* Only used for bitfields; position of start of field.
71 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
72 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
74 /* Frame value is relative to. In practice, this address is only
75 used if the value is stored in several registers in other than
76 the current frame, and these registers have not all been saved
77 at the same place in memory. This will be described in the
78 lval enum above as "lval_reg_frame_relative". */
80 /* Type of the value. */
82 /* Type of the enclosing object if this is an embedded subobject.
83 The member embedded_offset gives the real position of the subobject
84 if type is not the same as enclosing_type.
86 If the type field is a pointer type, then enclosing_type is
87 a pointer type pointing to the real (enclosing) type of the target
89 struct type
*enclosing_type
;
90 /* Values are stored in a chain, so that they can be deleted
91 easily over calls to the inferior. Values assigned to internal
92 variables or put into the value history are taken off this
96 /* ??? When is this used? */
102 /* Register number if the value is from a register. Is not kept
103 if you take a field of a structure that is stored in a
104 register. Shouldn't it be? */
106 /* If zero, contents of this value are in the contents field.
107 If nonzero, contents are in inferior memory at address
108 in the location.address field plus the offset field
109 (and the lval field should be lval_memory). */
111 /* If nonzero, this is the value of a variable which does not
112 actually exist in the program. */
114 /* If this value represents an object that is embedded inside a
115 larger object (e.g., a base subobject in C++), this gives the
116 offset (in bytes) from the start of the contents buffer where
117 the embedded object begins. This is required because some C++
118 runtime implementations lay out objects (especially virtual bases
119 with possibly negative offsets to ancestors).
120 Note: This may be positive or negative! Also note that this offset
121 is not used when retrieving contents from target memory; the entire
122 enclosing object has to be retrieved always, and the offset for
123 that is given by the member offset above. */
125 /* If this value represents a pointer to an object that is embedded
126 in another object, this gives the embedded_offset of the object
127 that is pointed to. */
128 int pointed_to_offset
;
129 /* The BFD section associated with this value. */
130 asection
*bfd_section
;
131 /* Actual contents of the value. For use of this value; setting
132 it uses the stuff above. Not valid if lazy is nonzero.
133 Target byte-order. We force it to be aligned properly for any
134 possible value. Note that a value therefore extends beyond
135 what is declared here. */
138 double force_double_align
;
139 LONGEST force_longlong_align
;
142 /* Do not add any new members here -- contents above will trash them */
145 typedef struct value
*value_ptr
;
147 #define VALUE_TYPE(val) (val)->type
148 #define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
149 #define VALUE_LAZY(val) (val)->lazy
150 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
151 the gdb buffer used to hold a copy of the contents of the lval.
152 VALUE_CONTENTS is used when the contents of the buffer are needed --
153 it uses value_fetch_lazy() to load the buffer from the process being
154 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
155 used when data is being stored into the buffer, or when it is
156 certain that the contents of the buffer are valid.
157 Note: The contents pointer is adjusted by the offset required to
158 get to the real subobject, if the value happens to represent
159 something embedded in a larger run-time object. */
161 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
162 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
163 VALUE_CONTENTS_RAW(val))
165 /* The ALL variants of the above two macros do not adjust the returned
166 pointer by the embedded_offset value. */
168 #define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
169 #define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
170 VALUE_CONTENTS_ALL_RAW(val))
173 extern int value_fetch_lazy
PARAMS ((value_ptr val
));
175 #define VALUE_LVAL(val) (val)->lval
176 #define VALUE_ADDRESS(val) (val)->location.address
177 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
178 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
179 #define VALUE_FRAME(val) ((val)->frame_addr)
180 #define VALUE_OFFSET(val) (val)->offset
181 #define VALUE_BITSIZE(val) (val)->bitsize
182 #define VALUE_BITPOS(val) (val)->bitpos
183 #define VALUE_NEXT(val) (val)->next
184 #define VALUE_REGNO(val) (val)->regno
185 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
186 #define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
187 #define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
188 #define VALUE_BFD_SECTION(val) ((val)->bfd_section)
190 /* Convert a REF to the object referenced. */
192 #define COERCE_REF(arg) \
193 do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
194 if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
195 arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
196 unpack_long (VALUE_TYPE (arg), \
197 VALUE_CONTENTS (arg)), \
198 VALUE_BFD_SECTION (arg)); \
201 /* If ARG is an array, convert it to a pointer.
202 If ARG is an enum, convert it to an integer.
203 If ARG is a function, convert it to a function pointer.
205 References are dereferenced. */
207 #define COERCE_ARRAY(arg) \
208 do { COERCE_REF(arg); \
209 if (current_language->c_style_arrays \
210 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
211 arg = value_coerce_array (arg); \
212 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
213 arg = value_coerce_function (arg); \
216 #define COERCE_NUMBER(arg) \
217 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
219 #define COERCE_VARYING_ARRAY(arg, real_arg_type) \
220 { if (chill_varying_type (real_arg_type)) \
221 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
223 /* If ARG is an enum, convert it to an integer. */
225 #define COERCE_ENUM(arg) { \
226 if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM) \
227 arg = value_cast (builtin_type_unsigned_int, arg); \
230 /* Internal variables (variables for convenience of use of debugger)
231 are recorded as a chain of these structures. */
235 struct internalvar
*next
;
240 /* Pointer to member function. Depends on compiler implementation. */
242 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
243 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
244 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
248 #include "gdbtypes.h"
249 #include "expression.h"
257 print_address_demangle
PARAMS ((CORE_ADDR
, GDB_FILE
*, int));
259 extern LONGEST value_as_long
PARAMS ((value_ptr val
));
261 extern DOUBLEST value_as_double
PARAMS ((value_ptr val
));
263 extern CORE_ADDR value_as_pointer
PARAMS ((value_ptr val
));
265 extern LONGEST unpack_long
PARAMS ((struct type
*type
, char *valaddr
));
267 extern DOUBLEST unpack_double
PARAMS ((struct type
*type
, char *valaddr
,
270 extern CORE_ADDR unpack_pointer
PARAMS ((struct type
*type
, char *valaddr
));
272 extern LONGEST unpack_field_as_long
PARAMS ((struct type
*type
, char *valaddr
,
275 extern value_ptr value_from_longest
PARAMS ((struct type
*type
, LONGEST num
));
277 extern value_ptr value_from_double
PARAMS ((struct type
*type
, DOUBLEST num
));
279 extern value_ptr value_from_string
PARAMS ((char *string
));
281 extern value_ptr value_at
PARAMS ((struct type
*type
, CORE_ADDR addr
, asection
*sect
));
283 extern value_ptr value_at_lazy
PARAMS ((struct type
*type
, CORE_ADDR addr
, asection
*sect
));
285 extern value_ptr value_from_register
PARAMS ((struct type
*type
, int regnum
,
286 struct frame_info
* frame
));
288 extern value_ptr value_of_variable
PARAMS ((struct symbol
*var
,
291 extern value_ptr value_of_register
PARAMS ((int regnum
));
293 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
295 extern value_ptr read_var_value
PARAMS ((struct symbol
*var
,
296 struct frame_info
*frame
));
298 extern value_ptr locate_var_value
PARAMS ((struct symbol
*var
,
299 struct frame_info
*frame
));
301 extern value_ptr allocate_value
PARAMS ((struct type
*type
));
303 extern value_ptr allocate_repeat_value
PARAMS ((struct type
*type
, int count
));
305 extern value_ptr value_mark
PARAMS ((void));
307 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
309 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
310 extern value_ptr value_bitstring
PARAMS ((char *ptr
, int len
));
312 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
313 value_ptr
*elemvec
));
315 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
317 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
318 enum exp_opcode op
));
320 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
322 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
324 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
326 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
328 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
330 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
332 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
334 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
336 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
338 extern value_ptr value_struct_elt
PARAMS ((value_ptr
*argp
, value_ptr
*args
,
340 int *static_memfuncp
, char *err
));
342 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
*domain
,
344 struct type
*curtype
,
346 struct type
*intype
));
348 extern value_ptr value_static_field
PARAMS ((struct type
*type
, int fieldno
));
350 extern struct fn_field
*value_find_oload_method_list
PARAMS ((value_ptr
*, char *, int, int *, int *, struct type
**, int *));
352 extern int find_overload_match
PARAMS ((struct type
** arg_types
, int nargs
, char * name
, int method
, int lax
, value_ptr obj
, struct symbol
*fsym
, value_ptr
*valp
, struct symbol
**symp
, int *staticp
));
354 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
356 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
358 struct type
*arg_type
));
361 value_rtti_type
PARAMS ((value_ptr
, int *, int *, int *));
364 value_rtti_target_type
PARAMS ((value_ptr
, int *, int *, int *));
367 value_full_object
PARAMS ((value_ptr
, struct type
*, int, int, int));
369 extern value_ptr value_cast
PARAMS ((struct type
*type
, value_ptr arg2
));
371 extern value_ptr value_zero
PARAMS ((struct type
*type
, enum lval_type lv
));
373 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
375 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
377 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
380 extern value_ptr value_being_returned
PARAMS ((struct type
*valtype
,
384 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
386 extern int value_bit_index
PARAMS ((struct type
*type
, char *addr
, int index
));
388 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
389 struct type
*value_type
, int gcc_p
));
391 extern void set_return_value
PARAMS ((value_ptr val
));
393 extern value_ptr evaluate_expression
PARAMS ((struct expression
*exp
));
395 extern value_ptr evaluate_type
PARAMS ((struct expression
*exp
));
397 extern value_ptr evaluate_subexp_with_coercion
PARAMS ((struct expression
*,
398 int *, enum noside
));
400 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
402 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
404 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
406 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
408 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
410 extern value_ptr access_value_history
PARAMS ((int num
));
412 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
*var
));
414 extern void set_internalvar
PARAMS ((struct internalvar
*var
, value_ptr val
));
416 extern void set_internalvar_component
PARAMS ((struct internalvar
*var
,
418 int bitpos
, int bitsize
,
419 value_ptr newvalue
));
421 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
423 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
425 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
427 extern int value_logical_not
PARAMS ((value_ptr arg1
));
431 extern value_ptr value_of_this
PARAMS ((int complain
));
433 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
435 enum exp_opcode otherop
,
436 enum noside noside
));
438 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
,
439 enum noside noside
));
441 extern value_ptr value_fn_field
PARAMS ((value_ptr
*arg1p
, struct fn_field
*f
,
443 struct type
* type
, int offset
));
445 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
*arg1p
,
446 struct fn_field
*f
, int j
,
450 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
451 value_ptr arg1
, value_ptr arg2
));
453 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
455 extern int destructor_name_p
PARAMS ((const char *name
,
456 const struct type
*type
));
458 #define value_free(val) free ((PTR)val)
460 extern void free_all_values
PARAMS ((void));
462 extern void release_value
PARAMS ((value_ptr val
));
464 extern int record_latest_value
PARAMS ((value_ptr val
));
466 extern void registers_changed
PARAMS ((void));
468 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
470 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
473 read_register_gen
PARAMS ((int regno
, char *myaddr
));
476 read_register
PARAMS ((int regno
));
479 read_register_pid
PARAMS ((int regno
, int pid
));
482 write_register
PARAMS ((int regno
, LONGEST val
));
485 write_register_pid
PARAMS ((int regno
, CORE_ADDR val
, int pid
));
488 supply_register
PARAMS ((int regno
, char *val
));
490 extern void get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
492 struct frame_info
*frame
,
493 int regnum
, enum lval_type
*lval
));
496 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
499 type_print
PARAMS ((struct type
*type
, char *varstring
, GDB_FILE
*stream
,
502 extern char *baseclass_addr
PARAMS ((struct type
*type
, int index
,
504 value_ptr
*valuep
, int *errp
));
507 print_longest
PARAMS ((GDB_FILE
*stream
, int format
, int use_local
,
511 print_floating
PARAMS ((char *valaddr
, struct type
*type
, GDB_FILE
*stream
));
513 extern int value_print
PARAMS ((value_ptr val
, GDB_FILE
*stream
, int format
,
514 enum val_prettyprint pretty
));
517 value_print_array_elements
PARAMS ((value_ptr val
, GDB_FILE
* stream
,
518 int format
, enum val_prettyprint pretty
));
521 value_release_to_mark
PARAMS ((value_ptr mark
));
524 val_print
PARAMS ((struct type
*type
, char *valaddr
, int embedded_offset
, CORE_ADDR address
,
525 GDB_FILE
*stream
, int format
, int deref_ref
,
526 int recurse
, enum val_prettyprint pretty
));
529 val_print_string
PARAMS ((CORE_ADDR addr
, int len
, int width
, GDB_FILE
*stream
));
532 print_variable_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
,
535 extern int check_field
PARAMS ((value_ptr
, const char *));
538 c_typedef_print
PARAMS ((struct type
*type
, struct symbol
*news
, GDB_FILE
*stream
));
541 internalvar_name
PARAMS ((struct internalvar
*var
));
544 clear_value_history
PARAMS ((void));
547 clear_internalvars
PARAMS ((void));
551 extern value_ptr value_copy
PARAMS ((value_ptr
));
553 extern int baseclass_offset
PARAMS ((struct type
*, int, char *, CORE_ADDR
));
557 extern value_ptr varying_to_slice
PARAMS ((value_ptr
));
559 extern value_ptr value_slice
PARAMS ((value_ptr
, int, int));
561 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
563 extern value_ptr value_literal_complex
PARAMS ((value_ptr
, value_ptr
, struct type
*));
565 extern void find_rt_vbase_offset
PARAMS ((struct type
*, struct type
*, char *, int, int *, int *));
567 extern value_ptr find_function_in_inferior
PARAMS ((char *));
569 extern value_ptr value_allocate_space_in_inferior
PARAMS ((int));
571 extern CORE_ADDR default_push_arguments
PARAMS ((int nargs
, value_ptr
*args
,
574 CORE_ADDR struct_addr
));
576 #endif /* !defined (VALUE_H) */