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"
247 print_address_demangle
PARAMS ((CORE_ADDR
, GDB_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_double
PARAMS ((struct type
* type
, DOUBLEST num
));
269 extern value_ptr value_from_string
PARAMS ((char *string
));
271 extern value_ptr value_at
PARAMS ((struct type
* type
, CORE_ADDR addr
, asection
* sect
));
273 extern value_ptr value_at_lazy
PARAMS ((struct type
* type
, CORE_ADDR addr
, asection
* sect
));
275 extern value_ptr value_from_register
PARAMS ((struct type
* type
, int regnum
,
276 struct frame_info
* frame
));
278 extern value_ptr value_of_variable
PARAMS ((struct symbol
* var
,
281 extern value_ptr value_of_register
PARAMS ((int regnum
));
283 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
285 extern value_ptr read_var_value
PARAMS ((struct symbol
* var
,
286 struct frame_info
* frame
));
288 extern value_ptr locate_var_value
PARAMS ((struct symbol
* var
,
289 struct frame_info
* frame
));
291 extern value_ptr allocate_value
PARAMS ((struct type
* type
));
293 extern value_ptr allocate_repeat_value
PARAMS ((struct type
* type
, int count
));
295 extern value_ptr value_mark
PARAMS ((void));
297 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
299 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
300 extern value_ptr value_bitstring
PARAMS ((char *ptr
, int len
));
302 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
303 value_ptr
* elemvec
));
305 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
307 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
308 enum exp_opcode op
));
310 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
312 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
314 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
316 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
318 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
320 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
322 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
324 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
326 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
328 extern value_ptr value_struct_elt
PARAMS ((value_ptr
* argp
, value_ptr
* args
,
330 int *static_memfuncp
, char *err
));
332 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
* domain
,
334 struct type
* curtype
,
336 struct type
* intype
));
338 extern value_ptr value_static_field
PARAMS ((struct type
* type
, int fieldno
));
340 extern struct fn_field
*value_find_oload_method_list
PARAMS ((value_ptr
*, char *, int, int *, int *, struct type
**, int *));
342 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
));
344 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
346 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
348 struct type
* arg_type
));
351 value_rtti_type
PARAMS ((value_ptr
, int *, int *, int *));
354 value_rtti_target_type
PARAMS ((value_ptr
, int *, int *, int *));
357 value_full_object
PARAMS ((value_ptr
, struct type
*, int, int, int));
359 extern value_ptr value_cast
PARAMS ((struct type
* type
, value_ptr arg2
));
361 extern value_ptr value_zero
PARAMS ((struct type
* type
, enum lval_type lv
));
363 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
365 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
367 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
368 struct type
* type
));
370 extern value_ptr value_being_returned
PARAMS ((struct type
* valtype
,
374 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
376 extern int value_bit_index
PARAMS ((struct type
* type
, char *addr
, int index
));
378 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
379 struct type
* value_type
, int gcc_p
));
381 extern void set_return_value
PARAMS ((value_ptr val
));
383 extern value_ptr evaluate_expression
PARAMS ((struct expression
* exp
));
385 extern value_ptr evaluate_type
PARAMS ((struct expression
* exp
));
387 extern value_ptr evaluate_subexp_with_coercion
PARAMS ((struct expression
*,
388 int *, enum noside
));
390 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
392 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
394 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
396 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
398 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
400 extern value_ptr access_value_history
PARAMS ((int num
));
402 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
* var
));
404 extern void set_internalvar
PARAMS ((struct internalvar
* var
, value_ptr val
));
406 extern void set_internalvar_component
PARAMS ((struct internalvar
* var
,
408 int bitpos
, int bitsize
,
409 value_ptr newvalue
));
411 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
413 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
415 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
417 extern int value_logical_not
PARAMS ((value_ptr arg1
));
421 extern value_ptr value_of_this
PARAMS ((int complain
));
423 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
425 enum exp_opcode otherop
,
426 enum noside noside
));
428 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
,
429 enum noside noside
));
431 extern value_ptr value_fn_field
PARAMS ((value_ptr
* arg1p
, struct fn_field
* f
,
433 struct type
* type
, int offset
));
435 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
* arg1p
,
436 struct fn_field
* f
, int j
,
440 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
441 value_ptr arg1
, value_ptr arg2
));
443 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
445 extern int destructor_name_p
PARAMS ((const char *name
,
446 const struct type
* type
));
448 #define value_free(val) free ((PTR)val)
450 extern void free_all_values
PARAMS ((void));
452 extern void release_value
PARAMS ((value_ptr val
));
454 extern int record_latest_value
PARAMS ((value_ptr val
));
456 extern void registers_changed
PARAMS ((void));
458 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
460 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
463 read_register_gen
PARAMS ((int regno
, char *myaddr
));
466 read_register
PARAMS ((int regno
));
469 read_register_pid
PARAMS ((int regno
, int pid
));
472 write_register
PARAMS ((int regno
, LONGEST val
));
475 write_register_pid
PARAMS ((int regno
, CORE_ADDR val
, int pid
));
478 supply_register
PARAMS ((int regno
, char *val
));
480 extern void get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
482 struct frame_info
* frame
,
483 int regnum
, enum lval_type
* lval
));
486 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
489 type_print
PARAMS ((struct type
* type
, char *varstring
, GDB_FILE
* stream
,
492 extern char *baseclass_addr
PARAMS ((struct type
* type
, int index
,
494 value_ptr
* valuep
, int *errp
));
497 print_longest
PARAMS ((GDB_FILE
* stream
, int format
, int use_local
,
501 print_floating
PARAMS ((char *valaddr
, struct type
* type
, GDB_FILE
* stream
));
503 extern int value_print
PARAMS ((value_ptr val
, GDB_FILE
* stream
, int format
,
504 enum val_prettyprint pretty
));
507 value_print_array_elements
PARAMS ((value_ptr val
, GDB_FILE
* stream
,
508 int format
, enum val_prettyprint pretty
));
511 value_release_to_mark
PARAMS ((value_ptr mark
));
514 val_print
PARAMS ((struct type
* type
, char *valaddr
, int embedded_offset
, CORE_ADDR address
,
515 GDB_FILE
* stream
, int format
, int deref_ref
,
516 int recurse
, enum val_prettyprint pretty
));
519 val_print_string
PARAMS ((CORE_ADDR addr
, int len
, int width
, GDB_FILE
* stream
));
522 print_variable_value
PARAMS ((struct symbol
* var
, struct frame_info
* frame
,
525 extern int check_field
PARAMS ((value_ptr
, const char *));
528 c_typedef_print
PARAMS ((struct type
* type
, struct symbol
* news
, GDB_FILE
* stream
));
531 internalvar_name
PARAMS ((struct internalvar
* var
));
534 clear_value_history
PARAMS ((void));
537 clear_internalvars
PARAMS ((void));
541 extern value_ptr value_copy
PARAMS ((value_ptr
));
543 extern int baseclass_offset
PARAMS ((struct type
*, int, char *, CORE_ADDR
));
547 extern value_ptr varying_to_slice
PARAMS ((value_ptr
));
549 extern value_ptr value_slice
PARAMS ((value_ptr
, int, int));
551 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
553 extern value_ptr value_literal_complex
PARAMS ((value_ptr
, value_ptr
, struct type
*));
555 extern void find_rt_vbase_offset
PARAMS ((struct type
*, struct type
*, char *, int, int *, int *));
557 extern value_ptr find_function_in_inferior
PARAMS ((char *));
559 extern value_ptr value_allocate_space_in_inferior
PARAMS ((int));
561 extern CORE_ADDR default_push_arguments
PARAMS ((int nargs
, value_ptr
* args
,
564 CORE_ADDR struct_addr
));
566 #endif /* !defined (VALUE_H) */