1 /* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1989, 1992, 1993, 1994 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
84 /* If an lval is forced to repeat, a new value is created with
85 these fields set. The new value is not an lval. */
88 /* Register number if the value is from a register. Is not kept
89 if you take a field of a structure that is stored in a
90 register. Shouldn't it be? */
92 /* If zero, contents of this value are in the contents field.
93 If nonzero, contents are in inferior memory at address
94 in the location.address field plus the offset field
95 (and the lval field should be lval_memory). */
97 /* If nonzero, this is the value of a variable which does not
98 actually exist in the program. */
100 /* Actual contents of the value. For use of this value; setting
101 it uses the stuff above. Not valid if lazy is nonzero.
102 Target byte-order. We force it to be aligned properly for any
106 double force_double_align
;
107 LONGEST force_longlong_align
;
112 typedef struct value
*value_ptr
;
114 #define VALUE_TYPE(val) (val)->type
115 #define VALUE_LAZY(val) (val)->lazy
116 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
117 the gdb buffer used to hold a copy of the contents of the lval.
118 VALUE_CONTENTS is used when the contents of the buffer are needed --
119 it uses value_fetch_lazy() to load the buffer from the process being
120 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
121 used when data is being stored into the buffer, or when it is
122 certain that the contents of the buffer are valid. */
123 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents)
124 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
125 VALUE_CONTENTS_RAW(val))
126 extern int value_fetch_lazy
PARAMS ((value_ptr val
));
128 #define VALUE_LVAL(val) (val)->lval
129 #define VALUE_ADDRESS(val) (val)->location.address
130 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
131 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
132 #define VALUE_FRAME(val) ((val)->frame_addr)
133 #define VALUE_OFFSET(val) (val)->offset
134 #define VALUE_BITSIZE(val) (val)->bitsize
135 #define VALUE_BITPOS(val) (val)->bitpos
136 #define VALUE_NEXT(val) (val)->next
137 #define VALUE_REPEATED(val) (val)->repeated
138 #define VALUE_REPETITIONS(val) (val)->repetitions
139 #define VALUE_REGNO(val) (val)->regno
140 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
142 /* Convert a REF to the object referenced. */
144 #define COERCE_REF(arg) \
145 { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
146 arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
147 unpack_long (VALUE_TYPE (arg), \
148 VALUE_CONTENTS (arg)));}
150 /* If ARG is an array, convert it to a pointer.
151 If ARG is an enum, convert it to an integer.
152 If ARG is a function, convert it to a function pointer.
154 References are dereferenced. */
156 #define COERCE_ARRAY(arg) \
158 if (VALUE_REPEATED (arg) \
159 || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
160 arg = value_coerce_array (arg); \
161 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
162 arg = value_coerce_function (arg); \
163 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
164 arg = value_cast (builtin_type_unsigned_int, arg); \
167 /* If ARG is an enum, convert it to an integer. */
169 #define COERCE_ENUM(arg) \
170 { COERCE_REF (arg); \
171 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
172 arg = value_cast (builtin_type_unsigned_int, arg); \
175 /* Internal variables (variables for convenience of use of debugger)
176 are recorded as a chain of these structures. */
180 struct internalvar
*next
;
185 /* Pointer to member function. Depends on compiler implementation. */
187 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
188 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
189 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
193 #include "gdbtypes.h"
194 #include "expression.h"
202 print_address_demangle
PARAMS ((CORE_ADDR
, GDB_FILE
*, int));
204 extern LONGEST value_as_long
PARAMS ((value_ptr val
));
206 extern double value_as_double
PARAMS ((value_ptr val
));
208 extern CORE_ADDR value_as_pointer
PARAMS ((value_ptr val
));
210 extern LONGEST unpack_long
PARAMS ((struct type
*type
, char *valaddr
));
212 extern double unpack_double
PARAMS ((struct type
*type
, char *valaddr
,
215 extern CORE_ADDR unpack_pointer
PARAMS ((struct type
*type
, char *valaddr
));
217 extern LONGEST unpack_field_as_long
PARAMS ((struct type
*type
, char *valaddr
,
220 extern value_ptr value_from_longest
PARAMS ((struct type
*type
, LONGEST num
));
222 extern value_ptr value_from_double
PARAMS ((struct type
*type
, double num
));
224 extern value_ptr value_at
PARAMS ((struct type
*type
, CORE_ADDR addr
));
226 extern value_ptr value_at_lazy
PARAMS ((struct type
*type
, CORE_ADDR addr
));
228 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
229 extern value_ptr value_from_register
PARAMS ((struct type
*type
, int regnum
,
230 struct frame_info
* frame
));
232 extern value_ptr value_of_variable
PARAMS ((struct symbol
*var
,
235 extern value_ptr value_of_register
PARAMS ((int regnum
));
237 extern int symbol_read_needs_frame
PARAMS ((struct symbol
*));
239 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
240 extern value_ptr read_var_value
PARAMS ((struct symbol
*var
,
241 struct frame_info
*frame
));
243 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
244 extern value_ptr locate_var_value
PARAMS ((struct symbol
*var
,
245 struct frame_info
*frame
));
247 extern value_ptr allocate_value
PARAMS ((struct type
*type
));
249 extern value_ptr allocate_repeat_value
PARAMS ((struct type
*type
, int count
));
251 extern value_ptr value_mark
PARAMS ((void));
253 extern void value_free_to_mark
PARAMS ((value_ptr mark
));
255 extern value_ptr value_string
PARAMS ((char *ptr
, int len
));
257 extern value_ptr value_array
PARAMS ((int lowbound
, int highbound
,
258 value_ptr
*elemvec
));
260 extern value_ptr value_concat
PARAMS ((value_ptr arg1
, value_ptr arg2
));
262 extern value_ptr value_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
263 enum exp_opcode op
));
265 extern value_ptr value_add
PARAMS ((value_ptr arg1
, value_ptr arg2
));
267 extern value_ptr value_sub
PARAMS ((value_ptr arg1
, value_ptr arg2
));
269 extern value_ptr value_coerce_array
PARAMS ((value_ptr arg1
));
271 extern value_ptr value_coerce_function
PARAMS ((value_ptr arg1
));
273 extern value_ptr value_ind
PARAMS ((value_ptr arg1
));
275 extern value_ptr value_addr
PARAMS ((value_ptr arg1
));
277 extern value_ptr value_assign
PARAMS ((value_ptr toval
, value_ptr fromval
));
279 extern value_ptr value_neg
PARAMS ((value_ptr arg1
));
281 extern value_ptr value_complement
PARAMS ((value_ptr arg1
));
283 extern value_ptr value_struct_elt
PARAMS ((value_ptr
*argp
, value
*args
,
285 int *static_memfuncp
, char *err
));
287 extern value_ptr value_struct_elt_for_reference
PARAMS ((struct type
*domain
,
289 struct type
*curtype
,
291 struct type
*intype
));
293 extern value_ptr value_field
PARAMS ((value_ptr arg1
, int fieldno
));
295 extern value_ptr value_primitive_field
PARAMS ((value_ptr arg1
, int offset
,
297 struct type
*arg_type
));
299 extern value_ptr value_cast
PARAMS ((struct type
*type
, value_ptr arg2
));
301 extern value_ptr value_zero
PARAMS ((struct type
*type
, enum lval_type lv
));
303 extern value_ptr value_repeat
PARAMS ((value_ptr arg1
, int count
));
305 extern value_ptr value_subscript
PARAMS ((value_ptr array
, value_ptr idx
));
307 extern value_ptr value_from_vtable_info
PARAMS ((value_ptr arg
,
310 extern value_ptr value_being_returned
PARAMS ((struct type
*valtype
,
311 char retbuf
[REGISTER_BYTES
],
314 extern value_ptr value_in
PARAMS ((value_ptr element
, value_ptr set
));
316 extern int value_bit_index
PARAMS ((struct type
*type
, char *addr
, int index
));
318 extern int using_struct_return
PARAMS ((value_ptr function
, CORE_ADDR funcaddr
,
319 struct type
*value_type
, int gcc_p
));
321 extern void set_return_value
PARAMS ((value_ptr val
));
323 extern value_ptr evaluate_expression
PARAMS ((struct expression
*exp
));
325 extern value_ptr evaluate_type
PARAMS ((struct expression
*exp
));
327 extern value_ptr parse_and_eval
PARAMS ((char *exp
));
329 extern value_ptr parse_to_comma_and_eval
PARAMS ((char **expp
));
331 extern struct type
*parse_and_eval_type
PARAMS ((char *p
, int length
));
333 extern CORE_ADDR parse_and_eval_address
PARAMS ((char *exp
));
335 extern CORE_ADDR parse_and_eval_address_1
PARAMS ((char **expptr
));
337 extern value_ptr access_value_history
PARAMS ((int num
));
339 extern value_ptr value_of_internalvar
PARAMS ((struct internalvar
*var
));
341 extern void set_internalvar
PARAMS ((struct internalvar
*var
, value_ptr val
));
343 extern void set_internalvar_component
PARAMS ((struct internalvar
*var
,
345 int bitpos
, int bitsize
,
346 value_ptr newvalue
));
348 extern struct internalvar
*lookup_internalvar
PARAMS ((char *name
));
350 extern int value_equal
PARAMS ((value_ptr arg1
, value_ptr arg2
));
352 extern int value_less
PARAMS ((value_ptr arg1
, value_ptr arg2
));
354 extern int value_logical_not
PARAMS ((value_ptr arg1
));
358 extern value_ptr value_of_this
PARAMS ((int complain
));
360 extern value_ptr value_x_binop
PARAMS ((value_ptr arg1
, value_ptr arg2
,
362 enum exp_opcode otherop
));
364 extern value_ptr value_x_unop
PARAMS ((value_ptr arg1
, enum exp_opcode op
));
366 extern value_ptr value_fn_field
PARAMS ((value_ptr
*arg1p
, struct fn_field
*f
,
368 struct type
* type
, int offset
));
370 extern value_ptr value_virtual_fn_field
PARAMS ((value_ptr
*arg1p
,
371 struct fn_field
*f
, int j
,
375 extern int binop_user_defined_p
PARAMS ((enum exp_opcode op
,
376 value_ptr arg1
, value_ptr arg2
));
378 extern int unop_user_defined_p
PARAMS ((enum exp_opcode op
, value_ptr arg1
));
380 extern int destructor_name_p
PARAMS ((const char *name
,
381 const struct type
*type
));
383 #define value_free(val) free ((PTR)val)
385 extern void free_all_values
PARAMS ((void));
387 extern void release_value
PARAMS ((value_ptr val
));
389 extern int record_latest_value
PARAMS ((value_ptr val
));
391 extern void registers_changed
PARAMS ((void));
393 extern void read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
395 extern void write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
398 read_register_gen
PARAMS ((int regno
, char *myaddr
));
401 read_register
PARAMS ((int regno
));
404 write_register
PARAMS ((int regno
, LONGEST val
));
407 supply_register
PARAMS ((int regno
, char *val
));
409 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
411 get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
412 CORE_ADDR
*addrp
, struct frame_info
*frame
,
413 int regnum
, enum lval_type
*lval
));
416 modify_field
PARAMS ((char *addr
, LONGEST fieldval
, int bitpos
, int bitsize
));
419 type_print
PARAMS ((struct type
*type
, char *varstring
, GDB_FILE
*stream
,
422 extern char *baseclass_addr
PARAMS ((struct type
*type
, int index
,
424 value_ptr
*valuep
, int *errp
));
427 print_longest
PARAMS ((GDB_FILE
*stream
, int format
, int use_local
,
431 print_floating
PARAMS ((char *valaddr
, struct type
*type
, GDB_FILE
*stream
));
433 extern int value_print
PARAMS ((value_ptr val
, GDB_FILE
*stream
, int format
,
434 enum val_prettyprint pretty
));
437 val_print
PARAMS ((struct type
*type
, char *valaddr
, CORE_ADDR address
,
438 GDB_FILE
*stream
, int format
, int deref_ref
,
439 int recurse
, enum val_prettyprint pretty
));
442 val_print_string
PARAMS ((CORE_ADDR addr
, unsigned int len
, GDB_FILE
*stream
));
444 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
446 print_variable_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
,
449 extern value_ptr value_arg_coerce
PARAMS ((value_ptr
));
451 extern int check_field
PARAMS ((value_ptr
, const char *));
454 c_typedef_print
PARAMS ((struct type
*type
, struct symbol
*new, GDB_FILE
*stream
));
457 internalvar_name
PARAMS ((struct internalvar
*var
));
460 clear_value_history
PARAMS ((void));
463 clear_internalvars
PARAMS ((void));
467 extern value_ptr value_copy
PARAMS ((value_ptr
));
469 extern int baseclass_offset
PARAMS ((struct type
*, int, value_ptr
, int));
473 extern value_ptr call_function_by_hand
PARAMS ((value_ptr
, int, value_ptr
*));
475 #endif /* !defined (VALUE_H) */