1 /* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1989, 1992 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 /* Location of value (if lval). */
53 /* Address in inferior or byte of registers structure. */
55 /* Pointer to internal variable. */
56 struct internalvar
*internalvar
;
57 /* Number of register. Only used with
58 lval_reg_frame_relative. */
61 /* Describes offset of a value within lval a structure in bytes. */
63 /* Only used for bitfields; number of bits contained in them. */
65 /* Only used for bitfields; position of start of field.
66 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
67 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
69 /* Frame value is relative to. In practice, this address is only
70 used if the value is stored in several registers in other than
71 the current frame, and these registers have not all been saved
72 at the same place in memory. This will be described in the
73 lval enum above as "lval_reg_frame_relative". */
75 /* Type of the value. */
77 /* Values are stored in a chain, so that they can be deleted
78 easily over calls to the inferior. Values assigned to internal
79 variables or put into the value history are taken off this
82 /* If an lval is forced to repeat, a new value is created with
83 these fields set. The new value is not an lval. */
86 /* Register number if the value is from a register. Is not kept
87 if you take a field of a structure that is stored in a
88 register. Shouldn't it be? */
90 /* If zero, contents of this value are in the contents field.
91 If nonzero, contents are in inferior memory at address
92 in the location.address field plus the offset field
93 (and the lval field should be lval_memory). */
95 /* If nonzero, this is the value of a variable which does not
96 actually exist in the program. */
98 /* Actual contents of the value. For use of this value; setting
99 it uses the stuff above. Not valid if lazy is nonzero.
100 Target byte-order. We force it to be aligned properly for any
104 double force_double_align
;
106 long long force_longlong_align
;
112 typedef struct value
*value
;
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))
127 value_fetch_lazy
PARAMS ((value val
));
129 #define VALUE_LVAL(val) (val)->lval
130 #define VALUE_ADDRESS(val) (val)->location.address
131 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
132 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
133 #define VALUE_FRAME(val) ((val)->frame_addr)
134 #define VALUE_OFFSET(val) (val)->offset
135 #define VALUE_BITSIZE(val) (val)->bitsize
136 #define VALUE_BITPOS(val) (val)->bitpos
137 #define VALUE_NEXT(val) (val)->next
138 #define VALUE_REPEATED(val) (val)->repeated
139 #define VALUE_REPETITIONS(val) (val)->repetitions
140 #define VALUE_REGNO(val) (val)->regno
141 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
143 /* Convert a REF to the object referenced. */
145 #define COERCE_REF(arg) \
146 { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
147 arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
148 unpack_long (VALUE_TYPE (arg), \
149 VALUE_CONTENTS (arg)));}
151 /* If ARG is an array, convert it to a pointer.
152 If ARG is an enum, convert it to an integer.
153 If ARG is a function, convert it to a function pointer.
155 References are dereferenced. */
157 #define COERCE_ARRAY(arg) \
159 if (VALUE_REPEATED (arg) \
160 || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
161 arg = value_coerce_array (arg); \
162 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
163 arg = value_coerce_function (arg); \
164 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
165 arg = value_cast (builtin_type_unsigned_int, arg); \
168 /* If ARG is an enum, convert it to an integer. */
170 #define COERCE_ENUM(arg) \
171 { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
172 arg = value_ind (arg); \
173 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
174 arg = value_cast (builtin_type_unsigned_int, arg); \
177 /* Internal variables (variables for convenience of use of debugger)
178 are recorded as a chain of these structures. */
182 struct internalvar
*next
;
187 /* Pointer to member function. Depends on compiler implementation. */
189 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
190 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
191 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
195 #include "gdbtypes.h"
196 #include "expression.h"
203 print_address_demangle
PARAMS ((CORE_ADDR
, FILE *, int));
206 value_as_long
PARAMS ((value val
));
209 value_as_double
PARAMS ((value val
));
212 value_as_pointer
PARAMS ((value val
));
215 unpack_long
PARAMS ((struct type
*type
, char *valaddr
));
218 unpack_double
PARAMS ((struct type
*type
, char *valaddr
, int *invp
));
221 unpack_pointer
PARAMS ((struct type
*type
, char *valaddr
));
224 unpack_field_as_long
PARAMS ((struct type
*type
, char *valaddr
,
228 value_from_longest
PARAMS ((struct type
*type
, LONGEST num
));
231 value_from_double
PARAMS ((struct type
*type
, double num
));
234 value_at
PARAMS ((struct type
*type
, CORE_ADDR addr
));
237 value_at_lazy
PARAMS ((struct type
*type
, CORE_ADDR addr
));
239 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
241 value_from_register
PARAMS ((struct type
*type
, int regnum
,
242 struct frame_info
* frame
));
245 value_of_variable
PARAMS ((struct symbol
*var
));
248 value_of_register
PARAMS ((int regnum
));
250 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
252 read_var_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
));
254 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
256 locate_var_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
));
259 allocate_value
PARAMS ((struct type
*type
));
262 allocate_repeat_value
PARAMS ((struct type
*type
, int count
));
265 value_mark
PARAMS ((void));
268 value_free_to_mark
PARAMS ((value mark
));
271 value_string
PARAMS ((char *ptr
, int len
));
274 value_binop
PARAMS ((value arg1
, value arg2
, enum exp_opcode op
));
277 value_add
PARAMS ((value arg1
, value arg2
));
280 value_sub
PARAMS ((value arg1
, value arg2
));
283 value_coerce_array
PARAMS ((value arg1
));
286 value_coerce_function
PARAMS ((value arg1
));
289 value_ind
PARAMS ((value arg1
));
292 value_addr
PARAMS ((value arg1
));
295 value_assign
PARAMS ((value toval
, value fromval
));
298 value_neg
PARAMS ((value arg1
));
301 value_lognot
PARAMS ((value arg1
));
304 value_struct_elt
PARAMS ((value
*argp
, value
*args
, char *name
,
305 int *static_memfuncp
, char *err
));
308 value_struct_elt_for_reference
PARAMS ((struct type
*domain
,
310 struct type
*curtype
,
312 struct type
*intype
));
315 value_field
PARAMS ((value arg1
, int fieldno
));
318 value_primitive_field
PARAMS ((value arg1
, int offset
, int fieldno
,
319 struct type
*arg_type
));
322 value_cast
PARAMS ((struct type
*type
, value arg2
));
325 value_zero
PARAMS ((struct type
*type
, enum lval_type lv
));
328 value_repeat
PARAMS ((value arg1
, int count
));
331 value_subscript
PARAMS ((value array
, value idx
));
334 value_from_vtable_info
PARAMS ((value arg
, struct type
*type
));
337 value_being_returned
PARAMS ((struct type
*valtype
,
338 char retbuf
[REGISTER_BYTES
],
342 using_struct_return
PARAMS ((value function
, CORE_ADDR funcaddr
,
343 struct type
*value_type
, int gcc_p
));
346 set_return_value
PARAMS ((value val
));
349 evaluate_expression
PARAMS ((struct expression
*exp
));
352 evaluate_type
PARAMS ((struct expression
*exp
));
355 parse_and_eval
PARAMS ((char *exp
));
358 parse_to_comma_and_eval
PARAMS ((char **expp
));
361 parse_and_eval_type
PARAMS ((char *p
, int length
));
364 parse_and_eval_address
PARAMS ((char *exp
));
367 parse_and_eval_address_1
PARAMS ((char **expptr
));
370 access_value_history
PARAMS ((int num
));
373 value_of_internalvar
PARAMS ((struct internalvar
*var
));
376 set_internalvar
PARAMS ((struct internalvar
*var
, value val
));
379 set_internalvar_component
PARAMS ((struct internalvar
*var
, int offset
,
380 int bitpos
, int bitsize
,
383 extern struct internalvar
*
384 lookup_internalvar
PARAMS ((char *name
));
387 value_equal
PARAMS ((value arg1
, value arg2
));
390 value_less
PARAMS ((value arg1
, value arg2
));
393 value_zerop
PARAMS ((value arg1
));
398 value_of_this
PARAMS ((int complain
));
401 value_x_binop
PARAMS ((value arg1
, value arg2
, enum exp_opcode op
,
402 enum exp_opcode otherop
));
405 value_x_unop
PARAMS ((value arg1
, enum exp_opcode op
));
408 value_fn_field
PARAMS ((value
*arg1p
, struct fn_field
*f
, int j
,
409 struct type
* type
, int offset
));
412 value_virtual_fn_field
PARAMS ((value
*arg1p
, struct fn_field
*f
, int j
,
413 struct type
*type
, int offset
));
416 binop_user_defined_p
PARAMS ((enum exp_opcode op
, value arg1
, value arg2
));
419 unop_user_defined_p
PARAMS ((enum exp_opcode op
, value arg1
));
422 typecmp
PARAMS ((int staticp
, struct type
*t1
[], value t2
[]));
425 destructor_name_p
PARAMS ((const char *name
, const struct type
*type
));
427 #define value_free(val) free ((PTR)val)
430 free_all_values
PARAMS ((void));
433 release_value
PARAMS ((value val
));
436 record_latest_value
PARAMS ((value val
));
439 registers_changed
PARAMS ((void));
442 read_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
445 write_register_bytes
PARAMS ((int regbyte
, char *myaddr
, int len
));
448 read_register_gen
PARAMS ((int regno
, char *myaddr
));
451 read_register
PARAMS ((int regno
));
454 write_register
PARAMS ((int regno
, int val
));
457 supply_register
PARAMS ((int regno
, char *val
));
459 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
461 get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
,
462 CORE_ADDR
*addrp
, struct frame_info
*frame
,
463 int regnum
, enum lval_type
*lval
));
466 modify_field
PARAMS ((char *addr
, int fieldval
, int bitpos
, int bitsize
));
469 type_print
PARAMS ((struct type
*type
, char *varstring
, FILE *stream
,
473 type_print_1
PARAMS ((struct type
*type
, char *varstring
, FILE *stream
,
474 int show
, int level
));
476 /* Possibilities for prettyprint parameters to routines which print
478 enum val_prettyprint
{
479 Val_no_prettyprint
= 0,
481 /* Use the default setting which the user has specified. */
486 baseclass_addr
PARAMS ((struct type
*type
, int index
, char *valaddr
,
487 value
*valuep
, int *errp
));
490 print_floating
PARAMS ((char *valaddr
, struct type
*type
, FILE *stream
));
493 value_print
PARAMS ((value val
, FILE *stream
, int format
,
494 enum val_prettyprint pretty
));
497 val_print
PARAMS ((struct type
*type
, char *valaddr
, CORE_ADDR address
,
498 FILE *stream
, int format
, int deref_ref
,
499 int recurse
, enum val_prettyprint pretty
));
501 /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
503 print_variable_value
PARAMS ((struct symbol
*var
, struct frame_info
*frame
,
507 value_arg_coerce
PARAMS ((value
));
510 check_field
PARAMS ((value
, const char *));
513 typedef_print
PARAMS ((struct type
*type
, struct symbol
*new, FILE *stream
));
516 internalvar_name
PARAMS ((struct internalvar
*var
));
519 clear_value_history
PARAMS ((void));
522 clear_internalvars
PARAMS ((void));
527 value_copy
PARAMS ((value
));
532 call_function_by_hand
PARAMS ((value
, int, value
*));
534 #endif /* !defined (VALUE_H) */