1 /* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1989, 1992-1996, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 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 /* Type of value; either not an lval, or one of the various
33 different possible kinds of lval. */
35 /* Is it modifiable? Only relevant if lval != not_lval. */
37 /* Location of value (if lval). */
40 /* If lval == lval_memory, this is the address in the inferior.
41 If lval == lval_register, this is the byte offset into the
42 registers structure. */
44 /* Pointer to internal variable. */
45 struct internalvar
*internalvar
;
46 /* Number of register. Only used with
47 lval_reg_frame_relative. */
51 /* Describes offset of a value within lval of a structure in bytes.
52 If lval == lval_memory, this is an offset to the address.
53 If lval == lval_register, this is a further offset from
54 location.address within the registers structure.
55 Note also the member embedded_offset below. */
57 /* Only used for bitfields; number of bits contained in them. */
59 /* Only used for bitfields; position of start of field.
60 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
61 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
63 /* Frame value is relative to. In practice, this address is only
64 used if the value is stored in several registers in other than
65 the current frame, and these registers have not all been saved
66 at the same place in memory. This will be described in the
67 lval enum above as "lval_reg_frame_relative". */
69 /* Type of the value. */
71 /* Type of the enclosing object if this is an embedded subobject.
72 The member embedded_offset gives the real position of the subobject
73 if type is not the same as enclosing_type.
75 If the type field is a pointer type, then enclosing_type is
76 a pointer type pointing to the real (enclosing) type of the target
78 struct type
*enclosing_type
;
79 /* Values are stored in a chain, so that they can be deleted
80 easily over calls to the inferior. Values assigned to internal
81 variables or put into the value history are taken off this
85 /* ??? When is this used? */
93 /* Register number if the value is from a register. Is not kept
94 if you take a field of a structure that is stored in a
95 register. Shouldn't it be? */
97 /* If zero, contents of this value are in the contents field.
98 If nonzero, contents are in inferior memory at address
99 in the location.address field plus the offset field
100 (and the lval field should be lval_memory). */
102 /* If nonzero, this is the value of a variable which does not
103 actually exist in the program. */
105 /* If this value represents an object that is embedded inside a
106 larger object (e.g., a base subobject in C++), this gives the
107 offset (in bytes) from the start of the contents buffer where
108 the embedded object begins. This is required because some C++
109 runtime implementations lay out objects (especially virtual bases
110 with possibly negative offsets to ancestors).
111 Note: This may be positive or negative! Also note that this offset
112 is not used when retrieving contents from target memory; the entire
113 enclosing object has to be retrieved always, and the offset for
114 that is given by the member offset above. */
116 /* If this value represents a pointer to an object that is embedded
117 in another object, this gives the embedded_offset of the object
118 that is pointed to. */
119 int pointed_to_offset
;
120 /* The BFD section associated with this value. */
121 asection
*bfd_section
;
122 /* Actual contents of the value. For use of this value; setting
123 it uses the stuff above. Not valid if lazy is nonzero.
124 Target byte-order. We force it to be aligned properly for any
125 possible value. Note that a value therefore extends beyond
126 what is declared here. */
130 double force_double_align
;
131 LONGEST force_longlong_align
;
135 /* Do not add any new members here -- contents above will trash them */
138 typedef struct value
*value_ptr
;
140 #define VALUE_TYPE(val) (val)->type
141 #define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
142 #define VALUE_LAZY(val) (val)->lazy
143 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
144 the gdb buffer used to hold a copy of the contents of the lval.
145 VALUE_CONTENTS is used when the contents of the buffer are needed --
146 it uses value_fetch_lazy() to load the buffer from the process being
147 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
148 used when data is being stored into the buffer, or when it is
149 certain that the contents of the buffer are valid.
150 Note: The contents pointer is adjusted by the offset required to
151 get to the real subobject, if the value happens to represent
152 something embedded in a larger run-time object. */
154 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
155 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
156 VALUE_CONTENTS_RAW(val))
158 /* The ALL variants of the above two macros do not adjust the returned
159 pointer by the embedded_offset value. */
161 #define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
162 #define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
163 VALUE_CONTENTS_ALL_RAW(val))
166 extern int value_fetch_lazy
PARAMS ((value_ptr val
));
168 #define VALUE_LVAL(val) (val)->lval
169 #define VALUE_ADDRESS(val) (val)->location.address
170 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
171 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
172 #define VALUE_FRAME(val) ((val)->frame_addr)
173 #define VALUE_OFFSET(val) (val)->offset
174 #define VALUE_BITSIZE(val) (val)->bitsize
175 #define VALUE_BITPOS(val) (val)->bitpos
176 #define VALUE_NEXT(val) (val)->next
177 #define VALUE_REGNO(val) (val)->regno
178 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
179 #define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
180 #define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
181 #define VALUE_BFD_SECTION(val) ((val)->bfd_section)
183 /* Convert a REF to the object referenced. */
185 #define COERCE_REF(arg) \
186 do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
187 if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
188 arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
189 unpack_pointer (VALUE_TYPE (arg), \
190 VALUE_CONTENTS (arg)), \
191 VALUE_BFD_SECTION (arg)); \
194 /* If ARG is an array, convert it to a pointer.
195 If ARG is an enum, convert it to an integer.
196 If ARG is a function, convert it to a function pointer.
198 References are dereferenced. */
200 #define COERCE_ARRAY(arg) \
201 do { COERCE_REF(arg); \
202 if (current_language->c_style_arrays \
203 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
204 arg = value_coerce_array (arg); \
205 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
206 arg = value_coerce_function (arg); \
209 #define COERCE_NUMBER(arg) \
210 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
212 #define COERCE_VARYING_ARRAY(arg, real_arg_type) \
213 { if (chill_varying_type (real_arg_type)) \
214 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
216 /* If ARG is an enum, convert it to an integer. */
218 #define COERCE_ENUM(arg) { \
219 if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM) \
220 arg = value_cast (builtin_type_unsigned_int, arg); \
223 /* Internal variables (variables for convenience of use of debugger)
224 are recorded as a chain of these structures. */
228 struct internalvar
*next
;
233 /* Pointer to member function. Depends on compiler implementation. */
235 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
236 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
237 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
241 #include "gdbtypes.h"
242 #include "expression.h"
247 extern void print_address_demangle (CORE_ADDR
, struct ui_file
*, int);
249 extern LONGEST value_as_long
PARAMS ((value_ptr val
));
251 extern DOUBLEST value_as_double
PARAMS ((value_ptr val
));
253 extern CORE_ADDR value_as_pointer
PARAMS ((value_ptr val
));
255 extern LONGEST unpack_long
PARAMS ((struct type
* type
, char *valaddr
));
257 extern DOUBLEST unpack_double
PARAMS ((struct type
* type
, char *valaddr
,
260 extern CORE_ADDR unpack_pointer
PARAMS ((struct type
* type
, char *valaddr
));
262 extern LONGEST unpack_field_as_long
PARAMS ((struct type
* type
, char *valaddr
,
265 extern value_ptr value_from_longest
PARAMS ((struct type
* type
, LONGEST num
));
267 extern value_ptr
value_from_pointer (struct type
*type
, CORE_ADDR addr
);
269 extern value_ptr value_from_double
PARAMS ((struct type
* type
, DOUBLEST num
));
271 extern value_ptr value_from_string
PARAMS ((char *string
));
273 extern value_ptr value_at
PARAMS ((struct type
* type
, CORE_ADDR addr
, asection
* sect
));
275 extern value_ptr value_at_lazy
PARAMS ((struct type
* type
, CORE_ADDR addr
, asection
* sect
));
277 extern value_ptr value_from_register
PARAMS ((struct type
* type
, int regnum
,
278 struct frame_info
* frame
));
280 extern value_ptr value_of_variable
PARAMS ((struct symbol
* var
,
283 extern value_ptr value_of_register
PARAMS ((int regnum
));
285 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
287 extern value_ptr read_var_value
PARAMS ((struct symbol
* var
,
288 struct frame_info
* frame
));
290 extern value_ptr locate_var_value
PARAMS ((struct symbol
* var
,
291 struct frame_info
* frame
));
293 extern value_ptr allocate_value
PARAMS ((struct type
* type
));
295 extern value_ptr allocate_repeat_value
PARAMS ((struct type
* type
, int count
));
297 extern value_ptr value_mark
PARAMS ((void));
299 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
301 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
302 extern value_ptr value_bitstring
PARAMS ((char *ptr
, int len
));
304 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
305 value_ptr
* elemvec
));
307 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
309 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
310 enum exp_opcode op
));
312 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
314 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
316 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
318 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
320 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
322 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
324 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
326 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
328 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
330 extern value_ptr value_struct_elt
PARAMS ((value_ptr
* argp
, value_ptr
* args
,
332 int *static_memfuncp
, char *err
));
334 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
* domain
,
336 struct type
* curtype
,
338 struct type
* intype
));
340 extern value_ptr value_static_field
PARAMS ((struct type
* type
, int fieldno
));
342 extern struct fn_field
*value_find_oload_method_list
PARAMS ((value_ptr
*, char *, int, int *, int *, struct type
**, int *));
344 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
));
346 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
348 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
350 struct type
* arg_type
));
353 value_rtti_type
PARAMS ((value_ptr
, int *, int *, int *));
356 value_rtti_target_type
PARAMS ((value_ptr
, int *, int *, int *));
359 value_full_object
PARAMS ((value_ptr
, struct type
*, int, int, int));
361 extern value_ptr value_cast
PARAMS ((struct type
* type
, value_ptr arg2
));
363 extern value_ptr value_zero
PARAMS ((struct type
* type
, enum lval_type lv
));
365 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
367 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
369 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
370 struct type
* type
));
372 extern value_ptr value_being_returned
PARAMS ((struct type
* valtype
,
376 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
378 extern int value_bit_index
PARAMS ((struct type
* type
, char *addr
, int index
));
380 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
381 struct type
* value_type
, int gcc_p
));
383 extern void set_return_value
PARAMS ((value_ptr val
));
385 extern value_ptr evaluate_expression
PARAMS ((struct expression
* exp
));
387 extern value_ptr evaluate_type
PARAMS ((struct expression
* exp
));
389 extern value_ptr evaluate_subexp_with_coercion
PARAMS ((struct expression
*,
390 int *, enum noside
));
392 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
394 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
396 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
398 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
400 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
402 extern value_ptr access_value_history
PARAMS ((int num
));
404 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
* var
));
406 extern void set_internalvar
PARAMS ((struct internalvar
* var
, value_ptr val
));
408 extern void set_internalvar_component
PARAMS ((struct internalvar
* var
,
410 int bitpos
, int bitsize
,
411 value_ptr newvalue
));
413 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
415 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
417 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
419 extern int value_logical_not
PARAMS ((value_ptr arg1
));
423 extern value_ptr value_of_this
PARAMS ((int complain
));
425 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
427 enum exp_opcode otherop
,
428 enum noside noside
));
430 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
,
431 enum noside noside
));
433 extern value_ptr value_fn_field
PARAMS ((value_ptr
* arg1p
, struct fn_field
* f
,
435 struct type
* type
, int offset
));
437 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
* arg1p
,
438 struct fn_field
* f
, int j
,
442 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
443 value_ptr arg1
, value_ptr arg2
));
445 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
447 extern int destructor_name_p
PARAMS ((const char *name
,
448 const struct type
* type
));
450 #define value_free(val) free ((PTR)val)
452 extern void free_all_values
PARAMS ((void));
454 extern void release_value
PARAMS ((value_ptr val
));
456 extern int record_latest_value
PARAMS ((value_ptr val
));
458 extern void registers_changed
PARAMS ((void));
460 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
462 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
465 read_register_gen
PARAMS ((int regno
, char *myaddr
));
468 write_register_gen
PARAMS ((int regno
, char *myaddr
));
471 read_register
PARAMS ((int regno
));
474 read_register_pid
PARAMS ((int regno
, int pid
));
477 write_register
PARAMS ((int regno
, LONGEST val
));
480 write_register_pid
PARAMS ((int regno
, CORE_ADDR val
, int pid
));
483 supply_register
PARAMS ((int regno
, char *val
));
485 extern void get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
487 struct frame_info
* frame
,
488 int regnum
, enum lval_type
* lval
));
491 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
493 extern void type_print (struct type
* type
, char *varstring
,
494 struct ui_file
* stream
, int show
);
496 extern char *baseclass_addr
PARAMS ((struct type
* type
, int index
,
498 value_ptr
* valuep
, int *errp
));
500 extern void print_longest (struct ui_file
* stream
, int format
,
501 int use_local
, LONGEST val
);
503 extern void print_floating (char *valaddr
, struct type
* type
,
504 struct ui_file
* stream
);
506 extern int value_print (value_ptr val
, struct ui_file
*stream
, int format
,
507 enum val_prettyprint pretty
);
509 extern void value_print_array_elements (value_ptr val
,
510 struct ui_file
*stream
,
512 enum val_prettyprint pretty
);
515 value_release_to_mark
PARAMS ((value_ptr mark
));
517 extern int val_print (struct type
* type
, char *valaddr
,
518 int embedded_offset
, CORE_ADDR address
,
519 struct ui_file
* stream
, int format
,
520 int deref_ref
, int recurse
,
521 enum val_prettyprint pretty
);
523 extern int val_print_string (CORE_ADDR addr
, int len
, int width
, struct ui_file
*stream
);
525 extern void print_variable_value (struct symbol
* var
,
526 struct frame_info
* frame
,
527 struct ui_file
*stream
);
529 extern int check_field
PARAMS ((value_ptr
, const char *));
531 extern void c_typedef_print (struct type
* type
, struct symbol
* news
,
532 struct ui_file
* stream
);
535 internalvar_name
PARAMS ((struct internalvar
* var
));
538 clear_value_history
PARAMS ((void));
541 clear_internalvars
PARAMS ((void));
545 extern value_ptr value_copy
PARAMS ((value_ptr
));
547 extern int baseclass_offset
PARAMS ((struct type
*, int, char *, CORE_ADDR
));
551 extern value_ptr varying_to_slice
PARAMS ((value_ptr
));
553 extern value_ptr value_slice
PARAMS ((value_ptr
, int, int));
555 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
557 extern int default_coerce_float_to_double (struct type
*, struct type
*);
559 extern int standard_coerce_float_to_double (struct type
*, struct type
*);
561 extern value_ptr value_literal_complex
PARAMS ((value_ptr
, value_ptr
, struct type
*));
563 extern void find_rt_vbase_offset
PARAMS ((struct type
*, struct type
*, char *, int, int *, int *));
565 extern value_ptr find_function_in_inferior
PARAMS ((char *));
567 extern value_ptr value_allocate_space_in_inferior
PARAMS ((int));
569 extern CORE_ADDR default_push_arguments
PARAMS ((int nargs
, value_ptr
* args
,
572 CORE_ADDR struct_addr
));
574 #endif /* !defined (VALUE_H) */