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 /* Convert a REF to the object referenced. */
152 #define COERCE_REF(arg) \
153 { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
154 arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
155 unpack_long (VALUE_TYPE (arg), \
156 VALUE_CONTENTS (arg)));}
158 /* If ARG is an array, convert it to a pointer.
159 If ARG is an enum, convert it to an integer.
160 If ARG is a function, convert it to a function pointer.
162 References are dereferenced. */
164 #define COERCE_ARRAY(arg) \
166 if (current_language->c_style_arrays \
167 && (VALUE_REPEATED (arg) \
168 || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY)) \
169 arg = value_coerce_array (arg); \
170 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
171 arg = value_coerce_function (arg); \
172 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
173 arg = value_cast (builtin_type_unsigned_int, arg); \
176 #define COERCE_VARYING_ARRAY(arg) \
177 { if (chill_varying_type (VALUE_TYPE (arg))) arg = varying_to_slice (arg); }
179 /* If ARG is an enum, convert it to an integer. */
181 #define COERCE_ENUM(arg) \
182 { COERCE_REF (arg); \
183 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
184 arg = value_cast (builtin_type_unsigned_int, arg); \
187 /* Internal variables (variables for convenience of use of debugger)
188 are recorded as a chain of these structures. */
192 struct internalvar
*next
;
197 /* Pointer to member function. Depends on compiler implementation. */
199 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
200 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
201 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
205 #include "gdbtypes.h"
206 #include "expression.h"
214 print_address_demangle
PARAMS ((CORE_ADDR
, GDB_FILE
*, int));
216 extern LONGEST value_as_long
PARAMS ((value_ptr val
));
218 extern double value_as_double
PARAMS ((value_ptr val
));
220 extern CORE_ADDR value_as_pointer
PARAMS ((value_ptr val
));
222 extern LONGEST unpack_long
PARAMS ((struct type
*type
, char *valaddr
));
224 extern double unpack_double
PARAMS ((struct type
*type
, char *valaddr
,
227 extern CORE_ADDR unpack_pointer
PARAMS ((struct type
*type
, char *valaddr
));
229 extern LONGEST unpack_field_as_long
PARAMS ((struct type
*type
, char *valaddr
,
232 extern value_ptr value_from_longest
PARAMS ((struct type
*type
, LONGEST num
));
234 extern value_ptr value_from_double
PARAMS ((struct type
*type
, double num
));
236 extern value_ptr value_at
PARAMS ((struct type
*type
, CORE_ADDR addr
));
238 extern value_ptr value_at_lazy
PARAMS ((struct type
*type
, CORE_ADDR addr
));
240 extern value_ptr value_from_register
PARAMS ((struct type
*type
, int regnum
,
241 struct frame_info
* frame
));
243 extern value_ptr value_of_variable
PARAMS ((struct symbol
*var
,
246 extern value_ptr value_of_register
PARAMS ((int regnum
));
248 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
250 extern value_ptr read_var_value
PARAMS ((struct symbol
*var
,
251 struct frame_info
*frame
));
253 extern value_ptr locate_var_value
PARAMS ((struct symbol
*var
,
254 struct frame_info
*frame
));
256 extern value_ptr allocate_value
PARAMS ((struct type
*type
));
258 extern value_ptr allocate_repeat_value
PARAMS ((struct type
*type
, int count
));
260 extern value_ptr value_mark
PARAMS ((void));
262 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
264 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
265 extern value_ptr value_bitstring
PARAMS ((char *ptr
, int len
));
267 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
268 value_ptr
*elemvec
));
270 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
272 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
273 enum exp_opcode op
));
275 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
277 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
279 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
281 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
283 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
285 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
287 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
289 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
291 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
293 extern value_ptr value_struct_elt
PARAMS ((value_ptr
*argp
, value_ptr
*args
,
295 int *static_memfuncp
, char *err
));
297 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
*domain
,
299 struct type
*curtype
,
301 struct type
*intype
));
303 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
305 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
307 struct type
*arg_type
));
309 extern value_ptr value_cast
PARAMS ((struct type
*type
, value_ptr arg2
));
311 extern value_ptr value_zero
PARAMS ((struct type
*type
, enum lval_type lv
));
313 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
315 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
317 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
320 extern value_ptr value_being_returned
PARAMS ((struct type
*valtype
,
321 char retbuf
[REGISTER_BYTES
],
324 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
326 extern int value_bit_index
PARAMS ((struct type
*type
, char *addr
, int index
));
328 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
329 struct type
*value_type
, int gcc_p
));
331 extern void set_return_value
PARAMS ((value_ptr val
));
333 extern value_ptr evaluate_expression
PARAMS ((struct expression
*exp
));
335 extern value_ptr evaluate_type
PARAMS ((struct expression
*exp
));
337 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
339 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
341 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
343 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
345 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
347 extern value_ptr access_value_history
PARAMS ((int num
));
349 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
*var
));
351 extern void set_internalvar
PARAMS ((struct internalvar
*var
, value_ptr val
));
353 extern void set_internalvar_component
PARAMS ((struct internalvar
*var
,
355 int bitpos
, int bitsize
,
356 value_ptr newvalue
));
358 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
360 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
362 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
364 extern int value_logical_not
PARAMS ((value_ptr arg1
));
368 extern value_ptr value_of_this
PARAMS ((int complain
));
370 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
372 enum exp_opcode otherop
));
374 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
));
376 extern value_ptr value_fn_field
PARAMS ((value_ptr
*arg1p
, struct fn_field
*f
,
378 struct type
* type
, int offset
));
380 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
*arg1p
,
381 struct fn_field
*f
, int j
,
385 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
386 value_ptr arg1
, value_ptr arg2
));
388 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
390 extern int destructor_name_p
PARAMS ((const char *name
,
391 const struct type
*type
));
393 #define value_free(val) free ((PTR)val)
395 extern void free_all_values
PARAMS ((void));
397 extern void release_value
PARAMS ((value_ptr val
));
399 extern int record_latest_value
PARAMS ((value_ptr val
));
401 extern void registers_changed
PARAMS ((void));
403 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
405 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
408 read_register_gen
PARAMS ((int regno
, char *myaddr
));
411 read_register
PARAMS ((int regno
));
414 write_register
PARAMS ((int regno
, LONGEST val
));
417 supply_register
PARAMS ((int regno
, char *val
));
420 get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
421 CORE_ADDR
*addrp
, struct frame_info
*frame
,
422 int regnum
, enum lval_type
*lval
));
425 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
428 type_print
PARAMS ((struct type
*type
, char *varstring
, GDB_FILE
*stream
,
431 extern char *baseclass_addr
PARAMS ((struct type
*type
, int index
,
433 value_ptr
*valuep
, int *errp
));
436 print_longest
PARAMS ((GDB_FILE
*stream
, int format
, int use_local
,
440 print_floating
PARAMS ((char *valaddr
, struct type
*type
, GDB_FILE
*stream
));
442 extern int value_print
PARAMS ((value_ptr val
, GDB_FILE
*stream
, int format
,
443 enum val_prettyprint pretty
));
446 value_print_array_elements
PARAMS ((value_ptr val
, GDB_FILE
* stream
,
447 int format
, enum val_prettyprint pretty
));
450 value_release_to_mark
PARAMS ((value_ptr mark
));
453 val_print
PARAMS ((struct type
*type
, char *valaddr
, CORE_ADDR address
,
454 GDB_FILE
*stream
, int format
, int deref_ref
,
455 int recurse
, enum val_prettyprint pretty
));
458 val_print_string
PARAMS ((CORE_ADDR addr
, unsigned int len
, GDB_FILE
*stream
));
461 print_variable_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
,
464 extern int check_field
PARAMS ((value_ptr
, const char *));
467 c_typedef_print
PARAMS ((struct type
*type
, struct symbol
*news
, GDB_FILE
*stream
));
470 internalvar_name
PARAMS ((struct internalvar
*var
));
473 clear_value_history
PARAMS ((void));
476 clear_internalvars
PARAMS ((void));
480 extern value_ptr value_copy
PARAMS ((value_ptr
));
482 extern int baseclass_offset
PARAMS ((struct type
*, int, value_ptr
, int));
486 extern value_ptr varying_to_slice
PARAMS ((value_ptr
));
488 extern value_ptr value_slice
PARAMS ((value_ptr
, int, int));
490 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
492 extern value_ptr value_literal_complex
PARAMS ((value_ptr
, value_ptr
, struct type
*));
494 #endif /* !defined (VALUE_H) */