1 /* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1989, 1992, 1993, 1994, 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #if !defined (VALUE_H)
24 * The structure which defines the type of a value. It should never
25 * be possible for a program lval value to survive over a call to the inferior
26 * (ie to be put into the history list or an internal variable).
31 /* In memory. Could be a saved register. */
35 /* In a gdb internal variable. */
37 /* Part of a gdb internal variable (structure field). */
38 lval_internalvar_component
,
39 /* In a register series in a frame not the current one, which may have been
40 partially saved or saved in different places (otherwise would be
41 lval_register or lval_memory). */
42 lval_reg_frame_relative
47 /* Type of value; either not an lval, or one of the various
48 different possible kinds of lval. */
50 /* Is it modifiable? Only relevant if lval != not_lval. */
52 /* Location of value (if lval). */
55 /* Address in inferior or byte of registers structure. */
57 /* Pointer to internal variable. */
58 struct internalvar
*internalvar
;
59 /* Number of register. Only used with
60 lval_reg_frame_relative. */
63 /* Describes offset of a value within lval a structure in bytes. */
65 /* Only used for bitfields; number of bits contained in them. */
67 /* Only used for bitfields; position of start of field.
68 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
69 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
71 /* Frame value is relative to. In practice, this address is only
72 used if the value is stored in several registers in other than
73 the current frame, and these registers have not all been saved
74 at the same place in memory. This will be described in the
75 lval enum above as "lval_reg_frame_relative". */
77 /* Type of the value. */
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? */
91 /* If an lval is forced to repeat, a new value is created with
92 these fields set. The new value is not an lval. */
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 /* If nonzero, this is the value of a variable which does not
105 actually exist in the program. */
107 /* Actual contents of the value. For use of this value; setting
108 it uses the stuff above. Not valid if lazy is nonzero.
109 Target byte-order. We force it to be aligned properly for any
113 double force_double_align
;
114 LONGEST force_longlong_align
;
120 typedef struct value
*value_ptr
;
122 #define VALUE_TYPE(val) (val)->type
123 #define VALUE_LAZY(val) (val)->lazy
124 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
125 the gdb buffer used to hold a copy of the contents of the lval.
126 VALUE_CONTENTS is used when the contents of the buffer are needed --
127 it uses value_fetch_lazy() to load the buffer from the process being
128 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
129 used when data is being stored into the buffer, or when it is
130 certain that the contents of the buffer are valid. */
131 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents)
132 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
133 VALUE_CONTENTS_RAW(val))
134 extern int value_fetch_lazy
PARAMS ((value_ptr val
));
136 #define VALUE_LVAL(val) (val)->lval
137 #define VALUE_ADDRESS(val) (val)->location.address
138 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
139 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
140 #define VALUE_FRAME(val) ((val)->frame_addr)
141 #define VALUE_OFFSET(val) (val)->offset
142 #define VALUE_BITSIZE(val) (val)->bitsize
143 #define VALUE_BITPOS(val) (val)->bitpos
144 #define VALUE_NEXT(val) (val)->next
145 #define VALUE_REPEATED(val) (val)->repeated
146 #define VALUE_REPETITIONS(val) (val)->repetitions
147 #define VALUE_REGNO(val) (val)->regno
148 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
150 /* This is probably not the right thing to do for in-gdb arrays. FIXME */
151 /* Overload the contents field to store literal data for
154 #define VALUE_LITERAL_DATA(val) ((val)->aligner.literal_data)
157 the base substring, for F77 string substring operators.
158 We use this ONLY when doing operations of the form
163 In the above case VALUE_SUBSTRING_* would point to
164 FOO(2) in the original FOO string.
166 Depending on whether the base object is allocated in the
167 inferior or the superior process, use VALUE_SUBSTRING_MYADDR or
168 VALUE_SUBSTRING_MEMADDR. */
170 #define VALUE_SUBSTRING_MEMADDR(val) (val)->substring_addr.memaddr
171 #define VALUE_SUBSTRING_MYADDR(val) (val)->substring_addr.myaddr
173 /* Convert a REF to the object referenced. */
175 #define COERCE_REF(arg) \
176 { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
177 arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
178 unpack_long (VALUE_TYPE (arg), \
179 VALUE_CONTENTS (arg)));}
181 /* If ARG is an array, convert it to a pointer.
182 If ARG is an enum, convert it to an integer.
183 If ARG is a function, convert it to a function pointer.
185 References are dereferenced. */
187 #define COERCE_ARRAY(arg) \
189 if (current_language->c_style_arrays \
190 && (VALUE_REPEATED (arg) \
191 || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY)) \
192 arg = value_coerce_array (arg); \
193 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
194 arg = value_coerce_function (arg); \
195 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
196 arg = value_cast (builtin_type_unsigned_int, arg); \
199 #define COERCE_VARYING_ARRAY(arg) \
200 { if (chill_varying_type (VALUE_TYPE (arg))) arg = varying_to_slice (arg); }
202 /* If ARG is an enum, convert it to an integer. */
204 #define COERCE_ENUM(arg) \
205 { COERCE_REF (arg); \
206 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
207 arg = value_cast (builtin_type_unsigned_int, arg); \
210 /* Internal variables (variables for convenience of use of debugger)
211 are recorded as a chain of these structures. */
215 struct internalvar
*next
;
220 /* Pointer to member function. Depends on compiler implementation. */
222 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
223 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
224 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
228 #include "gdbtypes.h"
229 #include "expression.h"
237 print_address_demangle
PARAMS ((CORE_ADDR
, GDB_FILE
*, int));
239 extern LONGEST value_as_long
PARAMS ((value_ptr val
));
241 extern double value_as_double
PARAMS ((value_ptr val
));
243 extern CORE_ADDR value_as_pointer
PARAMS ((value_ptr val
));
245 extern LONGEST unpack_long
PARAMS ((struct type
*type
, char *valaddr
));
247 extern double unpack_double
PARAMS ((struct type
*type
, char *valaddr
,
250 extern CORE_ADDR unpack_pointer
PARAMS ((struct type
*type
, char *valaddr
));
252 extern LONGEST unpack_field_as_long
PARAMS ((struct type
*type
, char *valaddr
,
255 extern value_ptr value_from_longest
PARAMS ((struct type
*type
, LONGEST num
));
257 extern value_ptr value_from_double
PARAMS ((struct type
*type
, double num
));
259 extern value_ptr value_at
PARAMS ((struct type
*type
, CORE_ADDR addr
));
261 extern value_ptr value_at_lazy
PARAMS ((struct type
*type
, CORE_ADDR addr
));
263 extern value_ptr value_from_register
PARAMS ((struct type
*type
, int regnum
,
264 struct frame_info
* frame
));
266 extern value_ptr value_of_variable
PARAMS ((struct symbol
*var
,
269 extern value_ptr value_of_register
PARAMS ((int regnum
));
271 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
273 extern value_ptr read_var_value
PARAMS ((struct symbol
*var
,
274 struct frame_info
*frame
));
276 extern value_ptr locate_var_value
PARAMS ((struct symbol
*var
,
277 struct frame_info
*frame
));
279 extern value_ptr allocate_value
PARAMS ((struct type
*type
));
281 extern value_ptr allocate_repeat_value
PARAMS ((struct type
*type
, int count
));
283 extern value_ptr value_mark
PARAMS ((void));
285 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
287 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
288 extern value_ptr value_bitstring
PARAMS ((char *ptr
, int len
));
290 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
291 value_ptr
*elemvec
));
293 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
295 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
296 enum exp_opcode op
));
298 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
300 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
302 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
304 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
306 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
308 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
310 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
312 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
314 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
316 extern value_ptr value_struct_elt
PARAMS ((value_ptr
*argp
, value_ptr
*args
,
318 int *static_memfuncp
, char *err
));
320 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
*domain
,
322 struct type
*curtype
,
324 struct type
*intype
));
326 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
328 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
330 struct type
*arg_type
));
332 extern value_ptr value_cast
PARAMS ((struct type
*type
, value_ptr arg2
));
334 extern value_ptr value_zero
PARAMS ((struct type
*type
, enum lval_type lv
));
336 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
338 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
340 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
343 extern value_ptr value_being_returned
PARAMS ((struct type
*valtype
,
344 char retbuf
[REGISTER_BYTES
],
347 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
349 extern int value_bit_index
PARAMS ((struct type
*type
, char *addr
, int index
));
351 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
352 struct type
*value_type
, int gcc_p
));
354 extern void set_return_value
PARAMS ((value_ptr val
));
356 extern value_ptr evaluate_expression
PARAMS ((struct expression
*exp
));
358 extern value_ptr evaluate_type
PARAMS ((struct expression
*exp
));
360 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
362 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
364 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
366 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
368 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
370 extern value_ptr access_value_history
PARAMS ((int num
));
372 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
*var
));
374 extern void set_internalvar
PARAMS ((struct internalvar
*var
, value_ptr val
));
376 extern void set_internalvar_component
PARAMS ((struct internalvar
*var
,
378 int bitpos
, int bitsize
,
379 value_ptr newvalue
));
381 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
383 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
385 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
387 extern int value_logical_not
PARAMS ((value_ptr arg1
));
391 extern value_ptr value_of_this
PARAMS ((int complain
));
393 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
395 enum exp_opcode otherop
));
397 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
));
399 extern value_ptr value_fn_field
PARAMS ((value_ptr
*arg1p
, struct fn_field
*f
,
401 struct type
* type
, int offset
));
403 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
*arg1p
,
404 struct fn_field
*f
, int j
,
408 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
409 value_ptr arg1
, value_ptr arg2
));
411 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
413 extern int destructor_name_p
PARAMS ((const char *name
,
414 const struct type
*type
));
416 #define value_free(val) free ((PTR)val)
418 extern void free_all_values
PARAMS ((void));
420 extern void release_value
PARAMS ((value_ptr val
));
422 extern int record_latest_value
PARAMS ((value_ptr val
));
424 extern void registers_changed
PARAMS ((void));
426 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
428 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
431 read_register_gen
PARAMS ((int regno
, char *myaddr
));
434 read_register
PARAMS ((int regno
));
437 write_register
PARAMS ((int regno
, LONGEST val
));
440 supply_register
PARAMS ((int regno
, char *val
));
443 get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
444 CORE_ADDR
*addrp
, struct frame_info
*frame
,
445 int regnum
, enum lval_type
*lval
));
448 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
451 type_print
PARAMS ((struct type
*type
, char *varstring
, GDB_FILE
*stream
,
454 extern char *baseclass_addr
PARAMS ((struct type
*type
, int index
,
456 value_ptr
*valuep
, int *errp
));
459 print_longest
PARAMS ((GDB_FILE
*stream
, int format
, int use_local
,
463 print_floating
PARAMS ((char *valaddr
, struct type
*type
, GDB_FILE
*stream
));
465 extern int value_print
PARAMS ((value_ptr val
, GDB_FILE
*stream
, int format
,
466 enum val_prettyprint pretty
));
469 value_print_array_elements
PARAMS ((value_ptr val
, GDB_FILE
* stream
,
470 int format
, enum val_prettyprint pretty
));
473 value_release_to_mark
PARAMS ((value_ptr mark
));
476 val_print
PARAMS ((struct type
*type
, char *valaddr
, CORE_ADDR address
,
477 GDB_FILE
*stream
, int format
, int deref_ref
,
478 int recurse
, enum val_prettyprint pretty
));
481 val_print_string
PARAMS ((CORE_ADDR addr
, unsigned int len
, GDB_FILE
*stream
));
484 print_variable_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
,
487 extern value_ptr value_arg_coerce
PARAMS ((value_ptr
));
489 extern int check_field
PARAMS ((value_ptr
, const char *));
492 c_typedef_print
PARAMS ((struct type
*type
, struct symbol
*news
, GDB_FILE
*stream
));
495 internalvar_name
PARAMS ((struct internalvar
*var
));
498 clear_value_history
PARAMS ((void));
501 clear_internalvars
PARAMS ((void));
505 extern value_ptr value_copy
PARAMS ((value_ptr
));
507 extern int baseclass_offset
PARAMS ((struct type
*, int, value_ptr
, int));
511 extern value_ptr varying_to_slice
PARAMS ((value_ptr
));
513 extern value_ptr value_slice
PARAMS ((value_ptr
, int, int));
515 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
517 extern value_ptr f77_value_literal_complex
PARAMS ((value_ptr
, value_ptr
, int));
519 extern value_ptr f77_value_literal_string
PARAMS ((int, int, value_ptr
*));
521 extern value_ptr f77_value_substring
PARAMS ((value_ptr
, int, int));
523 #endif /* !defined (VALUE_H) */