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,
20 Boston, MA 02111-1307, USA. */
22 #if !defined (VALUE_H)
26 * The structure which defines the type of a value. It should never
27 * be possible for a program lval value to survive over a call to the inferior
28 * (ie to be put into the history list or an internal variable).
33 /* Type of value; either not an lval, or one of the various
34 different possible kinds of lval. */
36 /* Is it modifiable? Only relevant if lval != not_lval. */
38 /* Location of value (if lval). */
41 /* Address in inferior or byte of registers structure. */
43 /* Pointer to internal variable. */
44 struct internalvar
*internalvar
;
45 /* Number of register. Only used with
46 lval_reg_frame_relative. */
50 /* Describes offset of a value within lval of a structure in bytes.
51 This is used in retrieving contents from target memory. [Note also
52 the member embedded_offset below.] */
54 /* Only used for bitfields; number of bits contained in them. */
56 /* Only used for bitfields; position of start of field.
57 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
58 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
60 /* Frame value is relative to. In practice, this address is only
61 used if the value is stored in several registers in other than
62 the current frame, and these registers have not all been saved
63 at the same place in memory. This will be described in the
64 lval enum above as "lval_reg_frame_relative". */
66 /* Type of the value. */
68 /* Type of the enclosing object if this is an embedded subobject.
69 The member embedded_offset gives the real position of the subobject
70 if type is not the same as enclosing_type.
72 If the type field is a pointer type, then enclosing_type is
73 a pointer type pointing to the real (enclosing) type of the target
75 struct type
*enclosing_type
;
76 /* Values are stored in a chain, so that they can be deleted
77 easily over calls to the inferior. Values assigned to internal
78 variables or put into the value history are taken off this
82 /* ??? When is this used? */
90 /* Register number if the value is from a register. Is not kept
91 if you take a field of a structure that is stored in a
92 register. Shouldn't it be? */
94 /* If zero, contents of this value are in the contents field.
95 If nonzero, contents are in inferior memory at address
96 in the location.address field plus the offset field
97 (and the lval field should be lval_memory). */
99 /* If nonzero, this is the value of a variable which does not
100 actually exist in the program. */
102 /* If this value represents an object that is embedded inside a
103 larger object (e.g., a base subobject in C++), this gives the
104 offset (in bytes) from the start of the contents buffer where
105 the embedded object begins. This is required because some C++
106 runtime implementations lay out objects (especially virtual bases
107 with possibly negative offsets to ancestors).
108 Note: This may be positive or negative! Also note that this offset
109 is not used when retrieving contents from target memory; the entire
110 enclosing object has to be retrieved always, and the offset for
111 that is given by the member offset above. */
113 /* If this value represents a pointer to an object that is embedded
114 in another object, this gives the embedded_offset of the object
115 that is pointed to. */
116 int pointed_to_offset
;
117 /* The BFD section associated with this value. */
118 asection
*bfd_section
;
119 /* Actual contents of the value. For use of this value; setting
120 it uses the stuff above. Not valid if lazy is nonzero.
121 Target byte-order. We force it to be aligned properly for any
122 possible value. Note that a value therefore extends beyond
123 what is declared here. */
127 double force_double_align
;
128 LONGEST force_longlong_align
;
132 /* Do not add any new members here -- contents above will trash them */
135 typedef struct value
*value_ptr
;
137 #define VALUE_TYPE(val) (val)->type
138 #define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
139 #define VALUE_LAZY(val) (val)->lazy
140 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
141 the gdb buffer used to hold a copy of the contents of the lval.
142 VALUE_CONTENTS is used when the contents of the buffer are needed --
143 it uses value_fetch_lazy() to load the buffer from the process being
144 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
145 used when data is being stored into the buffer, or when it is
146 certain that the contents of the buffer are valid.
147 Note: The contents pointer is adjusted by the offset required to
148 get to the real subobject, if the value happens to represent
149 something embedded in a larger run-time object. */
151 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
152 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
153 VALUE_CONTENTS_RAW(val))
155 /* The ALL variants of the above two macros do not adjust the returned
156 pointer by the embedded_offset value. */
158 #define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
159 #define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
160 VALUE_CONTENTS_ALL_RAW(val))
163 extern int value_fetch_lazy
PARAMS ((value_ptr val
));
165 #define VALUE_LVAL(val) (val)->lval
166 #define VALUE_ADDRESS(val) (val)->location.address
167 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
168 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
169 #define VALUE_FRAME(val) ((val)->frame_addr)
170 #define VALUE_OFFSET(val) (val)->offset
171 #define VALUE_BITSIZE(val) (val)->bitsize
172 #define VALUE_BITPOS(val) (val)->bitpos
173 #define VALUE_NEXT(val) (val)->next
174 #define VALUE_REGNO(val) (val)->regno
175 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
176 #define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
177 #define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
178 #define VALUE_BFD_SECTION(val) ((val)->bfd_section)
180 /* Convert a REF to the object referenced. */
182 #define COERCE_REF(arg) \
183 do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
184 if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
185 arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
186 unpack_long (VALUE_TYPE (arg), \
187 VALUE_CONTENTS (arg)), \
188 VALUE_BFD_SECTION (arg)); \
191 /* If ARG is an array, convert it to a pointer.
192 If ARG is an enum, convert it to an integer.
193 If ARG is a function, convert it to a function pointer.
195 References are dereferenced. */
197 #define COERCE_ARRAY(arg) \
198 do { COERCE_REF(arg); \
199 if (current_language->c_style_arrays \
200 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
201 arg = value_coerce_array (arg); \
202 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
203 arg = value_coerce_function (arg); \
206 #define COERCE_NUMBER(arg) \
207 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
209 #define COERCE_VARYING_ARRAY(arg, real_arg_type) \
210 { if (chill_varying_type (real_arg_type)) \
211 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
213 /* If ARG is an enum, convert it to an integer. */
215 #define COERCE_ENUM(arg) { \
216 if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM) \
217 arg = value_cast (builtin_type_unsigned_int, arg); \
220 /* Internal variables (variables for convenience of use of debugger)
221 are recorded as a chain of these structures. */
225 struct internalvar
*next
;
230 /* Pointer to member function. Depends on compiler implementation. */
232 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
233 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
234 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
238 #include "gdbtypes.h"
239 #include "expression.h"
245 print_address_demangle
PARAMS ((CORE_ADDR
, GDB_FILE
*, int));
247 extern LONGEST value_as_long
PARAMS ((value_ptr val
));
249 extern DOUBLEST value_as_double
PARAMS ((value_ptr val
));
251 extern CORE_ADDR value_as_pointer
PARAMS ((value_ptr val
));
253 extern LONGEST unpack_long
PARAMS ((struct type
* type
, char *valaddr
));
255 extern DOUBLEST unpack_double
PARAMS ((struct type
* type
, char *valaddr
,
258 extern CORE_ADDR unpack_pointer
PARAMS ((struct type
* type
, char *valaddr
));
260 extern LONGEST unpack_field_as_long
PARAMS ((struct type
* type
, char *valaddr
,
263 extern value_ptr value_from_longest
PARAMS ((struct type
* type
, LONGEST num
));
265 extern value_ptr value_from_double
PARAMS ((struct type
* type
, DOUBLEST num
));
267 extern value_ptr value_from_string
PARAMS ((char *string
));
269 extern value_ptr value_at
PARAMS ((struct type
* type
, CORE_ADDR addr
, asection
* sect
));
271 extern value_ptr value_at_lazy
PARAMS ((struct type
* type
, CORE_ADDR addr
, asection
* sect
));
273 extern value_ptr value_from_register
PARAMS ((struct type
* type
, int regnum
,
274 struct frame_info
* frame
));
276 extern value_ptr value_of_variable
PARAMS ((struct symbol
* var
,
279 extern value_ptr value_of_register
PARAMS ((int regnum
));
281 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
283 extern value_ptr read_var_value
PARAMS ((struct symbol
* var
,
284 struct frame_info
* frame
));
286 extern value_ptr locate_var_value
PARAMS ((struct symbol
* var
,
287 struct frame_info
* frame
));
289 extern value_ptr allocate_value
PARAMS ((struct type
* type
));
291 extern value_ptr allocate_repeat_value
PARAMS ((struct type
* type
, int count
));
293 extern value_ptr value_mark
PARAMS ((void));
295 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
297 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
298 extern value_ptr value_bitstring
PARAMS ((char *ptr
, int len
));
300 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
301 value_ptr
* elemvec
));
303 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
305 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
306 enum exp_opcode op
));
308 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
310 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
312 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
314 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
316 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
318 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
320 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
322 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
324 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
326 extern value_ptr value_struct_elt
PARAMS ((value_ptr
* argp
, value_ptr
* args
,
328 int *static_memfuncp
, char *err
));
330 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
* domain
,
332 struct type
* curtype
,
334 struct type
* intype
));
336 extern value_ptr value_static_field
PARAMS ((struct type
* type
, int fieldno
));
338 extern struct fn_field
*value_find_oload_method_list
PARAMS ((value_ptr
*, char *, int, int *, int *, struct type
**, int *));
340 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
));
342 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
344 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
346 struct type
* arg_type
));
349 value_rtti_type
PARAMS ((value_ptr
, int *, int *, int *));
352 value_rtti_target_type
PARAMS ((value_ptr
, int *, int *, int *));
355 value_full_object
PARAMS ((value_ptr
, struct type
*, int, int, int));
357 extern value_ptr value_cast
PARAMS ((struct type
* type
, value_ptr arg2
));
359 extern value_ptr value_zero
PARAMS ((struct type
* type
, enum lval_type lv
));
361 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
363 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
365 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
366 struct type
* type
));
368 extern value_ptr value_being_returned
PARAMS ((struct type
* valtype
,
372 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
374 extern int value_bit_index
PARAMS ((struct type
* type
, char *addr
, int index
));
376 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
377 struct type
* value_type
, int gcc_p
));
379 extern void set_return_value
PARAMS ((value_ptr val
));
381 extern value_ptr evaluate_expression
PARAMS ((struct expression
* exp
));
383 extern value_ptr evaluate_type
PARAMS ((struct expression
* exp
));
385 extern value_ptr evaluate_subexp_with_coercion
PARAMS ((struct expression
*,
386 int *, enum noside
));
388 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
390 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
392 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
394 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
396 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
398 extern value_ptr access_value_history
PARAMS ((int num
));
400 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
* var
));
402 extern void set_internalvar
PARAMS ((struct internalvar
* var
, value_ptr val
));
404 extern void set_internalvar_component
PARAMS ((struct internalvar
* var
,
406 int bitpos
, int bitsize
,
407 value_ptr newvalue
));
409 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
411 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
413 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
415 extern int value_logical_not
PARAMS ((value_ptr arg1
));
419 extern value_ptr value_of_this
PARAMS ((int complain
));
421 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
423 enum exp_opcode otherop
,
424 enum noside noside
));
426 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
,
427 enum noside noside
));
429 extern value_ptr value_fn_field
PARAMS ((value_ptr
* arg1p
, struct fn_field
* f
,
431 struct type
* type
, int offset
));
433 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
* arg1p
,
434 struct fn_field
* f
, int j
,
438 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
439 value_ptr arg1
, value_ptr arg2
));
441 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
443 extern int destructor_name_p
PARAMS ((const char *name
,
444 const struct type
* type
));
446 #define value_free(val) free ((PTR)val)
448 extern void free_all_values
PARAMS ((void));
450 extern void release_value
PARAMS ((value_ptr val
));
452 extern int record_latest_value
PARAMS ((value_ptr val
));
454 extern void registers_changed
PARAMS ((void));
456 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
458 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
461 read_register_gen
PARAMS ((int regno
, char *myaddr
));
464 read_register
PARAMS ((int regno
));
467 read_register_pid
PARAMS ((int regno
, int pid
));
470 write_register
PARAMS ((int regno
, LONGEST val
));
473 write_register_pid
PARAMS ((int regno
, CORE_ADDR val
, int pid
));
476 supply_register
PARAMS ((int regno
, char *val
));
478 extern void get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
480 struct frame_info
* frame
,
481 int regnum
, enum lval_type
* lval
));
484 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
487 type_print
PARAMS ((struct type
* type
, char *varstring
, GDB_FILE
* stream
,
490 extern char *baseclass_addr
PARAMS ((struct type
* type
, int index
,
492 value_ptr
* valuep
, int *errp
));
495 print_longest
PARAMS ((GDB_FILE
* stream
, int format
, int use_local
,
499 print_floating
PARAMS ((char *valaddr
, struct type
* type
, GDB_FILE
* stream
));
501 extern int value_print
PARAMS ((value_ptr val
, GDB_FILE
* stream
, int format
,
502 enum val_prettyprint pretty
));
505 value_print_array_elements
PARAMS ((value_ptr val
, GDB_FILE
* stream
,
506 int format
, enum val_prettyprint pretty
));
509 value_release_to_mark
PARAMS ((value_ptr mark
));
512 val_print
PARAMS ((struct type
* type
, char *valaddr
, int embedded_offset
, CORE_ADDR address
,
513 GDB_FILE
* stream
, int format
, int deref_ref
,
514 int recurse
, enum val_prettyprint pretty
));
517 val_print_string
PARAMS ((CORE_ADDR addr
, int len
, int width
, GDB_FILE
* stream
));
520 print_variable_value
PARAMS ((struct symbol
* var
, struct frame_info
* frame
,
523 extern int check_field
PARAMS ((value_ptr
, const char *));
526 c_typedef_print
PARAMS ((struct type
* type
, struct symbol
* news
, GDB_FILE
* stream
));
529 internalvar_name
PARAMS ((struct internalvar
* var
));
532 clear_value_history
PARAMS ((void));
535 clear_internalvars
PARAMS ((void));
539 extern value_ptr value_copy
PARAMS ((value_ptr
));
541 extern int baseclass_offset
PARAMS ((struct type
*, int, char *, CORE_ADDR
));
545 extern value_ptr varying_to_slice
PARAMS ((value_ptr
));
547 extern value_ptr value_slice
PARAMS ((value_ptr
, int, int));
549 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
551 extern value_ptr value_literal_complex
PARAMS ((value_ptr
, value_ptr
, struct type
*));
553 extern void find_rt_vbase_offset
PARAMS ((struct type
*, struct type
*, char *, int, int *, int *));
555 extern value_ptr find_function_in_inferior
PARAMS ((char *));
557 extern value_ptr value_allocate_space_in_inferior
PARAMS ((int));
559 extern CORE_ADDR default_push_arguments
PARAMS ((int nargs
, value_ptr
* args
,
562 CORE_ADDR struct_addr
));
564 #endif /* !defined (VALUE_H) */