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, Boston, MA 02111-1307, USA. */
21 #if !defined (VALUE_H)
25 * The structure which defines the type of a value. It should never
26 * be possible for a program lval value to survive over a call to the inferior
27 * (ie to be put into the history list or an internal variable).
32 /* In memory. Could be a saved register. */
36 /* In a gdb internal variable. */
38 /* Part of a gdb internal variable (structure field). */
39 lval_internalvar_component,
40 /* In a register series in a frame not the current one, which may have been
41 partially saved or saved in different places (otherwise would be
42 lval_register or lval_memory). */
43 lval_reg_frame_relative
48 /* Type of value; either not an lval, or one of the various
49 different possible kinds of lval. */
51 /* Is it modifiable? Only relevant if lval != not_lval. */
53 /* Location of value (if lval). */
56 /* Address in inferior or byte of registers structure. */
58 /* Pointer to internal variable. */
59 struct internalvar *internalvar;
60 /* Number of register. Only used with
61 lval_reg_frame_relative. */
64 /* Describes offset of a value within lval a structure in bytes. */
66 /* Only used for bitfields; number of bits contained in them. */
68 /* Only used for bitfields; position of start of field.
69 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
70 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
72 /* Frame value is relative to. In practice, this address is only
73 used if the value is stored in several registers in other than
74 the current frame, and these registers have not all been saved
75 at the same place in memory. This will be described in the
76 lval enum above as "lval_reg_frame_relative". */
78 /* Type of the value. */
80 /* Values are stored in a chain, so that they can be deleted
81 easily over calls to the inferior. Values assigned to internal
82 variables or put into the value history are taken off this
86 /* ??? When is this used? */
92 /* Register number if the value is from a register. Is not kept
93 if you take a field of a structure that is stored in a
94 register. Shouldn't it be? */
96 /* If zero, contents of this value are in the contents field.
97 If nonzero, contents are in inferior memory at address
98 in the location.address field plus the offset field
99 (and the lval field should be lval_memory). */
101 /* If nonzero, this is the value of a variable which does not
102 actually exist in the program. */
104 /* Actual contents of the value. For use of this value; setting
105 it uses the stuff above. Not valid if lazy is nonzero.
106 Target byte-order. We force it to be aligned properly for any
110 double force_double_align;
111 LONGEST force_longlong_align;
117 typedef struct value *value_ptr;
119 #define VALUE_TYPE(val) (val)->type
120 #define VALUE_LAZY(val) (val)->lazy
121 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
122 the gdb buffer used to hold a copy of the contents of the lval.
123 VALUE_CONTENTS is used when the contents of the buffer are needed --
124 it uses value_fetch_lazy() to load the buffer from the process being
125 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
126 used when data is being stored into the buffer, or when it is
127 certain that the contents of the buffer are valid. */
128 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents)
129 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
130 VALUE_CONTENTS_RAW(val))
131 extern int value_fetch_lazy PARAMS ((value_ptr val));
133 #define VALUE_LVAL(val) (val)->lval
134 #define VALUE_ADDRESS(val) (val)->location.address
135 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
136 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
137 #define VALUE_FRAME(val) ((val)->frame_addr)
138 #define VALUE_OFFSET(val) (val)->offset
139 #define VALUE_BITSIZE(val) (val)->bitsize
140 #define VALUE_BITPOS(val) (val)->bitpos
141 #define VALUE_NEXT(val) (val)->next
142 #define VALUE_REGNO(val) (val)->regno
143 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
145 /* Convert a REF to the object referenced. */
147 #define COERCE_REF(arg) \
148 do { CHECK_TYPEDEF (VALUE_TYPE (arg)); \
149 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
150 arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
151 unpack_long (VALUE_TYPE (arg), \
152 VALUE_CONTENTS (arg))); \
155 /* If ARG is an array, convert it to a pointer.
156 If ARG is an enum, convert it to an integer.
157 If ARG is a function, convert it to a function pointer.
159 References are dereferenced. */
161 #define COERCE_ARRAY(arg) \
162 do { COERCE_REF(arg); \
163 if (current_language->c_style_arrays \
164 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
165 arg = value_coerce_array (arg); \
166 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
167 arg = value_coerce_function (arg); \
170 #define COERCE_NUMBER(arg) \
171 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
173 #define COERCE_VARYING_ARRAY(arg, real_arg_type) \
174 { if (chill_varying_type (real_arg_type)) \
175 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
177 /* If ARG is an enum, convert it to an integer. */
179 #define COERCE_ENUM(arg) { \
180 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
181 arg = value_cast (builtin_type_unsigned_int, arg); \
184 /* Internal variables (variables for convenience of use of debugger)
185 are recorded as a chain of these structures. */
189 struct internalvar *next;
194 /* Pointer to member function. Depends on compiler implementation. */
196 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
197 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
198 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
202 #include "gdbtypes.h"
203 #include "expression.h"
211 print_address_demangle PARAMS ((CORE_ADDR, GDB_FILE *, int));
213 extern LONGEST value_as_long PARAMS ((value_ptr val));
215 extern DOUBLEST value_as_double PARAMS ((value_ptr val));
217 extern CORE_ADDR value_as_pointer PARAMS ((value_ptr val));
219 extern LONGEST unpack_long PARAMS ((struct type *type, char *valaddr));
221 extern DOUBLEST unpack_double PARAMS ((struct type *type, char *valaddr,
224 extern CORE_ADDR unpack_pointer PARAMS ((struct type *type, char *valaddr));
226 extern LONGEST unpack_field_as_long PARAMS ((struct type *type, char *valaddr,
229 extern value_ptr value_from_longest PARAMS ((struct type *type, LONGEST num));
231 extern value_ptr value_from_double PARAMS ((struct type *type, DOUBLEST num));
233 extern value_ptr value_at PARAMS ((struct type *type, CORE_ADDR addr));
235 extern value_ptr value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr));
237 extern value_ptr value_from_register PARAMS ((struct type *type, int regnum,
238 struct frame_info * frame));
240 extern value_ptr value_of_variable PARAMS ((struct symbol *var,
243 extern value_ptr value_of_register PARAMS ((int regnum));
245 extern int symbol_read_needs_frame PARAMS ((struct symbol *));
247 extern value_ptr read_var_value PARAMS ((struct symbol *var,
248 struct frame_info *frame));
250 extern value_ptr locate_var_value PARAMS ((struct symbol *var,
251 struct frame_info *frame));
253 extern value_ptr allocate_value PARAMS ((struct type *type));
255 extern value_ptr allocate_repeat_value PARAMS ((struct type *type, int count));
257 extern value_ptr value_mark PARAMS ((void));
259 extern void value_free_to_mark PARAMS ((value_ptr mark));
261 extern value_ptr value_string PARAMS ((char *ptr, int len));
262 extern value_ptr value_bitstring PARAMS ((char *ptr, int len));
264 extern value_ptr value_array PARAMS ((int lowbound, int highbound,
265 value_ptr *elemvec));
267 extern value_ptr value_concat PARAMS ((value_ptr arg1, value_ptr arg2));
269 extern value_ptr value_binop PARAMS ((value_ptr arg1, value_ptr arg2,
270 enum exp_opcode op));
272 extern value_ptr value_add PARAMS ((value_ptr arg1, value_ptr arg2));
274 extern value_ptr value_sub PARAMS ((value_ptr arg1, value_ptr arg2));
276 extern value_ptr value_coerce_array PARAMS ((value_ptr arg1));
278 extern value_ptr value_coerce_function PARAMS ((value_ptr arg1));
280 extern value_ptr value_ind PARAMS ((value_ptr arg1));
282 extern value_ptr value_addr PARAMS ((value_ptr arg1));
284 extern value_ptr value_assign PARAMS ((value_ptr toval, value_ptr fromval));
286 extern value_ptr value_neg PARAMS ((value_ptr arg1));
288 extern value_ptr value_complement PARAMS ((value_ptr arg1));
290 extern value_ptr value_struct_elt PARAMS ((value_ptr *argp, value_ptr *args,
292 int *static_memfuncp, char *err));
294 extern value_ptr value_struct_elt_for_reference PARAMS ((struct type *domain,
296 struct type *curtype,
298 struct type *intype));
300 extern value_ptr value_field PARAMS ((value_ptr arg1, int fieldno));
302 extern value_ptr value_primitive_field PARAMS ((value_ptr arg1, int offset,
304 struct type *arg_type));
306 extern value_ptr value_cast PARAMS ((struct type *type, value_ptr arg2));
308 extern value_ptr value_zero PARAMS ((struct type *type, enum lval_type lv));
310 extern value_ptr value_repeat PARAMS ((value_ptr arg1, int count));
312 extern value_ptr value_subscript PARAMS ((value_ptr array, value_ptr idx));
314 extern value_ptr value_from_vtable_info PARAMS ((value_ptr arg,
317 extern value_ptr value_being_returned PARAMS ((struct type *valtype,
318 char retbuf[REGISTER_BYTES],
321 extern value_ptr value_in PARAMS ((value_ptr element, value_ptr set));
323 extern int value_bit_index PARAMS ((struct type *type, char *addr, int index));
325 extern int using_struct_return PARAMS ((value_ptr function, CORE_ADDR funcaddr,
326 struct type *value_type, int gcc_p));
328 extern void set_return_value PARAMS ((value_ptr val));
330 extern value_ptr evaluate_expression PARAMS ((struct expression *exp));
332 extern value_ptr evaluate_type PARAMS ((struct expression *exp));
334 extern value_ptr evaluate_subexp_with_coercion PARAMS ((struct expression *,
335 int *, enum noside));
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,
373 enum noside noside));
375 extern value_ptr value_x_unop PARAMS ((value_ptr arg1, enum exp_opcode op,
376 enum noside noside));
378 extern value_ptr value_fn_field PARAMS ((value_ptr *arg1p, struct fn_field *f,
380 struct type* type, int offset));
382 extern value_ptr value_virtual_fn_field PARAMS ((value_ptr *arg1p,
383 struct fn_field *f, int j,
387 extern int binop_user_defined_p PARAMS ((enum exp_opcode op,
388 value_ptr arg1, value_ptr arg2));
390 extern int unop_user_defined_p PARAMS ((enum exp_opcode op, value_ptr arg1));
392 extern int destructor_name_p PARAMS ((const char *name,
393 const struct type *type));
395 #define value_free(val) free ((PTR)val)
397 extern void free_all_values PARAMS ((void));
399 extern void release_value PARAMS ((value_ptr val));
401 extern int record_latest_value PARAMS ((value_ptr val));
403 extern void registers_changed PARAMS ((void));
405 extern void read_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
407 extern void write_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
410 read_register_gen PARAMS ((int regno, char *myaddr));
413 read_register PARAMS ((int regno));
416 write_register PARAMS ((int regno, LONGEST val));
419 supply_register PARAMS ((int regno, char *val));
422 get_saved_register PARAMS ((char *raw_buffer, int *optimized,
423 CORE_ADDR *addrp, struct frame_info *frame,
424 int regnum, enum lval_type *lval));
427 modify_field PARAMS ((char *addr, LONGEST fieldval, int bitpos, int bitsize));
430 type_print PARAMS ((struct type *type, char *varstring, GDB_FILE *stream,
433 extern char *baseclass_addr PARAMS ((struct type *type, int index,
435 value_ptr *valuep, int *errp));
438 print_longest PARAMS ((GDB_FILE *stream, int format, int use_local,
442 print_floating PARAMS ((char *valaddr, struct type *type, GDB_FILE *stream));
444 extern int value_print PARAMS ((value_ptr val, GDB_FILE *stream, int format,
445 enum val_prettyprint pretty));
448 value_print_array_elements PARAMS ((value_ptr val, GDB_FILE* stream,
449 int format, enum val_prettyprint pretty));
452 value_release_to_mark PARAMS ((value_ptr mark));
455 val_print PARAMS ((struct type *type, char *valaddr, CORE_ADDR address,
456 GDB_FILE *stream, int format, int deref_ref,
457 int recurse, enum val_prettyprint pretty));
460 val_print_string PARAMS ((CORE_ADDR addr, unsigned int len, GDB_FILE *stream));
463 print_variable_value PARAMS ((struct symbol *var, struct frame_info *frame,
466 extern int check_field PARAMS ((value_ptr, const char *));
469 c_typedef_print PARAMS ((struct type *type, struct symbol *news, GDB_FILE *stream));
472 internalvar_name PARAMS ((struct internalvar *var));
475 clear_value_history PARAMS ((void));
478 clear_internalvars PARAMS ((void));
482 extern value_ptr value_copy PARAMS ((value_ptr));
484 extern int baseclass_offset PARAMS ((struct type *, int, char *, CORE_ADDR));
488 extern value_ptr varying_to_slice PARAMS ((value_ptr));
490 extern value_ptr value_slice PARAMS ((value_ptr, int, int));
492 extern value_ptr call_function_by_hand PARAMS ((value_ptr, int, value_ptr *));
494 extern value_ptr value_literal_complex PARAMS ((value_ptr, value_ptr, struct type*));
496 extern value_ptr find_function_in_inferior PARAMS ((char *));
498 extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
500 #endif /* !defined (VALUE_H) */