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,
20 Boston, MA 02111-1307, USA. */
22 #if !defined (VALUE_H)
26 * The structure which defines the type of a value. It should never
27 * be possible for a program lval value to survive over a call to the inferior
28 * (ie to be put into the history list or an internal variable).
33 /* Type of value; either not an lval, or one of the various
34 different possible kinds of lval. */
36 /* Is it modifiable? Only relevant if lval != not_lval. */
38 /* Location of value (if lval). */
41 /* If lval == lval_memory, this is the address in the inferior.
42 If lval == lval_register, this is the byte offset into the
43 registers structure. */
45 /* Pointer to internal variable. */
46 struct internalvar *internalvar;
47 /* Number of register. Only used with
48 lval_reg_frame_relative. */
52 /* Describes offset of a value within lval of a structure in bytes.
53 If lval == lval_memory, this is an offset to the address.
54 If lval == lval_register, this is a further offset from
55 location.address within the registers structure.
56 Note also the member embedded_offset below. */
58 /* Only used for bitfields; number of bits contained in them. */
60 /* Only used for bitfields; position of start of field.
61 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
62 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
64 /* Frame value is relative to. In practice, this address is only
65 used if the value is stored in several registers in other than
66 the current frame, and these registers have not all been saved
67 at the same place in memory. This will be described in the
68 lval enum above as "lval_reg_frame_relative". */
70 /* Type of the value. */
72 /* Type of the enclosing object if this is an embedded subobject.
73 The member embedded_offset gives the real position of the subobject
74 if type is not the same as enclosing_type.
76 If the type field is a pointer type, then enclosing_type is
77 a pointer type pointing to the real (enclosing) type of the target
79 struct type *enclosing_type;
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? */
94 /* Register number if the value is from a register. Is not kept
95 if you take a field of a structure that is stored in a
96 register. Shouldn't it be? */
98 /* If zero, contents of this value are in the contents field.
99 If nonzero, contents are in inferior memory at address
100 in the location.address field plus the offset field
101 (and the lval field should be lval_memory). */
103 /* If nonzero, this is the value of a variable which does not
104 actually exist in the program. */
106 /* If this value represents an object that is embedded inside a
107 larger object (e.g., a base subobject in C++), this gives the
108 offset (in bytes) from the start of the contents buffer where
109 the embedded object begins. This is required because some C++
110 runtime implementations lay out objects (especially virtual bases
111 with possibly negative offsets to ancestors).
112 Note: This may be positive or negative! Also note that this offset
113 is not used when retrieving contents from target memory; the entire
114 enclosing object has to be retrieved always, and the offset for
115 that is given by the member offset above. */
117 /* If this value represents a pointer to an object that is embedded
118 in another object, this gives the embedded_offset of the object
119 that is pointed to. */
120 int pointed_to_offset;
121 /* The BFD section associated with this value. */
122 asection *bfd_section;
123 /* Actual contents of the value. For use of this value; setting
124 it uses the stuff above. Not valid if lazy is nonzero.
125 Target byte-order. We force it to be aligned properly for any
126 possible value. Note that a value therefore extends beyond
127 what is declared here. */
131 double force_double_align;
132 LONGEST force_longlong_align;
136 /* Do not add any new members here -- contents above will trash them */
139 typedef struct value *value_ptr;
141 #define VALUE_TYPE(val) (val)->type
142 #define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
143 #define VALUE_LAZY(val) (val)->lazy
144 /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
145 the gdb buffer used to hold a copy of the contents of the lval.
146 VALUE_CONTENTS is used when the contents of the buffer are needed --
147 it uses value_fetch_lazy() to load the buffer from the process being
148 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
149 used when data is being stored into the buffer, or when it is
150 certain that the contents of the buffer are valid.
151 Note: The contents pointer is adjusted by the offset required to
152 get to the real subobject, if the value happens to represent
153 something embedded in a larger run-time object. */
155 #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
156 #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
157 VALUE_CONTENTS_RAW(val))
159 /* The ALL variants of the above two macros do not adjust the returned
160 pointer by the embedded_offset value. */
162 #define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
163 #define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
164 VALUE_CONTENTS_ALL_RAW(val))
167 extern int value_fetch_lazy PARAMS ((value_ptr val));
169 #define VALUE_LVAL(val) (val)->lval
170 #define VALUE_ADDRESS(val) (val)->location.address
171 #define VALUE_INTERNALVAR(val) (val)->location.internalvar
172 #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
173 #define VALUE_FRAME(val) ((val)->frame_addr)
174 #define VALUE_OFFSET(val) (val)->offset
175 #define VALUE_BITSIZE(val) (val)->bitsize
176 #define VALUE_BITPOS(val) (val)->bitpos
177 #define VALUE_NEXT(val) (val)->next
178 #define VALUE_REGNO(val) (val)->regno
179 #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
180 #define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
181 #define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
182 #define VALUE_BFD_SECTION(val) ((val)->bfd_section)
184 /* Convert a REF to the object referenced. */
186 #define COERCE_REF(arg) \
187 do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
188 if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
189 arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
190 unpack_long (VALUE_TYPE (arg), \
191 VALUE_CONTENTS (arg)), \
192 VALUE_BFD_SECTION (arg)); \
195 /* If ARG is an array, convert it to a pointer.
196 If ARG is an enum, convert it to an integer.
197 If ARG is a function, convert it to a function pointer.
199 References are dereferenced. */
201 #define COERCE_ARRAY(arg) \
202 do { COERCE_REF(arg); \
203 if (current_language->c_style_arrays \
204 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
205 arg = value_coerce_array (arg); \
206 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
207 arg = value_coerce_function (arg); \
210 #define COERCE_NUMBER(arg) \
211 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
213 #define COERCE_VARYING_ARRAY(arg, real_arg_type) \
214 { if (chill_varying_type (real_arg_type)) \
215 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
217 /* If ARG is an enum, convert it to an integer. */
219 #define COERCE_ENUM(arg) { \
220 if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM) \
221 arg = value_cast (builtin_type_unsigned_int, arg); \
224 /* Internal variables (variables for convenience of use of debugger)
225 are recorded as a chain of these structures. */
229 struct internalvar *next;
234 /* Pointer to member function. Depends on compiler implementation. */
236 #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
237 #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
238 #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
242 #include "gdbtypes.h"
243 #include "expression.h"
249 print_address_demangle PARAMS ((CORE_ADDR, GDB_FILE *, int));
251 extern LONGEST value_as_long PARAMS ((value_ptr val));
253 extern DOUBLEST value_as_double PARAMS ((value_ptr val));
255 extern CORE_ADDR value_as_pointer PARAMS ((value_ptr val));
257 extern LONGEST unpack_long PARAMS ((struct type * type, char *valaddr));
259 extern DOUBLEST unpack_double PARAMS ((struct type * type, char *valaddr,
262 extern CORE_ADDR unpack_pointer PARAMS ((struct type * type, char *valaddr));
264 extern LONGEST unpack_field_as_long PARAMS ((struct type * type, char *valaddr,
267 extern value_ptr value_from_longest PARAMS ((struct type * type, LONGEST num));
269 extern value_ptr value_from_double PARAMS ((struct type * type, DOUBLEST num));
271 extern value_ptr value_from_string PARAMS ((char *string));
273 extern value_ptr value_at PARAMS ((struct type * type, CORE_ADDR addr, asection * sect));
275 extern value_ptr value_at_lazy PARAMS ((struct type * type, CORE_ADDR addr, asection * sect));
277 extern value_ptr value_from_register PARAMS ((struct type * type, int regnum,
278 struct frame_info * frame));
280 extern value_ptr value_of_variable PARAMS ((struct symbol * var,
283 extern value_ptr value_of_register PARAMS ((int regnum));
285 extern int symbol_read_needs_frame PARAMS ((struct symbol *));
287 extern value_ptr read_var_value PARAMS ((struct symbol * var,
288 struct frame_info * frame));
290 extern value_ptr locate_var_value PARAMS ((struct symbol * var,
291 struct frame_info * frame));
293 extern value_ptr allocate_value PARAMS ((struct type * type));
295 extern value_ptr allocate_repeat_value PARAMS ((struct type * type, int count));
297 extern value_ptr value_mark PARAMS ((void));
299 extern void value_free_to_mark PARAMS ((value_ptr mark));
301 extern value_ptr value_string PARAMS ((char *ptr, int len));
302 extern value_ptr value_bitstring PARAMS ((char *ptr, int len));
304 extern value_ptr value_array PARAMS ((int lowbound, int highbound,
305 value_ptr * elemvec));
307 extern value_ptr value_concat PARAMS ((value_ptr arg1, value_ptr arg2));
309 extern value_ptr value_binop PARAMS ((value_ptr arg1, value_ptr arg2,
310 enum exp_opcode op));
312 extern value_ptr value_add PARAMS ((value_ptr arg1, value_ptr arg2));
314 extern value_ptr value_sub PARAMS ((value_ptr arg1, value_ptr arg2));
316 extern value_ptr value_coerce_array PARAMS ((value_ptr arg1));
318 extern value_ptr value_coerce_function PARAMS ((value_ptr arg1));
320 extern value_ptr value_ind PARAMS ((value_ptr arg1));
322 extern value_ptr value_addr PARAMS ((value_ptr arg1));
324 extern value_ptr value_assign PARAMS ((value_ptr toval, value_ptr fromval));
326 extern value_ptr value_neg PARAMS ((value_ptr arg1));
328 extern value_ptr value_complement PARAMS ((value_ptr arg1));
330 extern value_ptr value_struct_elt PARAMS ((value_ptr * argp, value_ptr * args,
332 int *static_memfuncp, char *err));
334 extern value_ptr value_struct_elt_for_reference PARAMS ((struct type * domain,
336 struct type * curtype,
338 struct type * intype));
340 extern value_ptr value_static_field PARAMS ((struct type * type, int fieldno));
342 extern struct fn_field *value_find_oload_method_list PARAMS ((value_ptr *, char *, int, int *, int *, struct type **, int *));
344 extern int find_overload_match PARAMS ((struct type ** arg_types, int nargs, char *name, int method, int lax, value_ptr obj, struct symbol * fsym, value_ptr * valp, struct symbol ** symp, int *staticp));
346 extern value_ptr value_field PARAMS ((value_ptr arg1, int fieldno));
348 extern value_ptr value_primitive_field PARAMS ((value_ptr arg1, int offset,
350 struct type * arg_type));
353 value_rtti_type PARAMS ((value_ptr, int *, int *, int *));
356 value_rtti_target_type PARAMS ((value_ptr, int *, int *, int *));
359 value_full_object PARAMS ((value_ptr, struct type *, int, int, int));
361 extern value_ptr value_cast PARAMS ((struct type * type, value_ptr arg2));
363 extern value_ptr value_zero PARAMS ((struct type * type, enum lval_type lv));
365 extern value_ptr value_repeat PARAMS ((value_ptr arg1, int count));
367 extern value_ptr value_subscript PARAMS ((value_ptr array, value_ptr idx));
369 extern value_ptr value_from_vtable_info PARAMS ((value_ptr arg,
370 struct type * type));
372 extern value_ptr value_being_returned PARAMS ((struct type * valtype,
376 extern value_ptr value_in PARAMS ((value_ptr element, value_ptr set));
378 extern int value_bit_index PARAMS ((struct type * type, char *addr, int index));
380 extern int using_struct_return PARAMS ((value_ptr function, CORE_ADDR funcaddr,
381 struct type * value_type, int gcc_p));
383 extern void set_return_value PARAMS ((value_ptr val));
385 extern value_ptr evaluate_expression PARAMS ((struct expression * exp));
387 extern value_ptr evaluate_type PARAMS ((struct expression * exp));
389 extern value_ptr evaluate_subexp_with_coercion PARAMS ((struct expression *,
390 int *, enum noside));
392 extern value_ptr parse_and_eval PARAMS ((char *exp));
394 extern value_ptr parse_to_comma_and_eval PARAMS ((char **expp));
396 extern struct type *parse_and_eval_type PARAMS ((char *p, int length));
398 extern CORE_ADDR parse_and_eval_address PARAMS ((char *exp));
400 extern CORE_ADDR parse_and_eval_address_1 PARAMS ((char **expptr));
402 extern value_ptr access_value_history PARAMS ((int num));
404 extern value_ptr value_of_internalvar PARAMS ((struct internalvar * var));
406 extern void set_internalvar PARAMS ((struct internalvar * var, value_ptr val));
408 extern void set_internalvar_component PARAMS ((struct internalvar * var,
410 int bitpos, int bitsize,
411 value_ptr newvalue));
413 extern struct internalvar *lookup_internalvar PARAMS ((char *name));
415 extern int value_equal PARAMS ((value_ptr arg1, value_ptr arg2));
417 extern int value_less PARAMS ((value_ptr arg1, value_ptr arg2));
419 extern int value_logical_not PARAMS ((value_ptr arg1));
423 extern value_ptr value_of_this PARAMS ((int complain));
425 extern value_ptr value_x_binop PARAMS ((value_ptr arg1, value_ptr arg2,
427 enum exp_opcode otherop,
428 enum noside noside));
430 extern value_ptr value_x_unop PARAMS ((value_ptr arg1, enum exp_opcode op,
431 enum noside noside));
433 extern value_ptr value_fn_field PARAMS ((value_ptr * arg1p, struct fn_field * f,
435 struct type * type, int offset));
437 extern value_ptr value_virtual_fn_field PARAMS ((value_ptr * arg1p,
438 struct fn_field * f, int j,
442 extern int binop_user_defined_p PARAMS ((enum exp_opcode op,
443 value_ptr arg1, value_ptr arg2));
445 extern int unop_user_defined_p PARAMS ((enum exp_opcode op, value_ptr arg1));
447 extern int destructor_name_p PARAMS ((const char *name,
448 const struct type * type));
450 #define value_free(val) free ((PTR)val)
452 extern void free_all_values PARAMS ((void));
454 extern void release_value PARAMS ((value_ptr val));
456 extern int record_latest_value PARAMS ((value_ptr val));
458 extern void registers_changed PARAMS ((void));
460 extern void read_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
462 extern void write_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
465 read_register_gen PARAMS ((int regno, char *myaddr));
468 read_register PARAMS ((int regno));
471 read_register_pid PARAMS ((int regno, int pid));
474 write_register PARAMS ((int regno, LONGEST val));
477 write_register_pid PARAMS ((int regno, CORE_ADDR val, int pid));
480 supply_register PARAMS ((int regno, char *val));
482 extern void get_saved_register PARAMS ((char *raw_buffer, int *optimized,
484 struct frame_info * frame,
485 int regnum, enum lval_type * lval));
488 modify_field PARAMS ((char *addr, LONGEST fieldval, int bitpos, int bitsize));
491 type_print PARAMS ((struct type * type, char *varstring, GDB_FILE * stream,
494 extern char *baseclass_addr PARAMS ((struct type * type, int index,
496 value_ptr * valuep, int *errp));
499 print_longest PARAMS ((GDB_FILE * stream, int format, int use_local,
503 print_floating PARAMS ((char *valaddr, struct type * type, GDB_FILE * stream));
505 extern int value_print PARAMS ((value_ptr val, GDB_FILE * stream, int format,
506 enum val_prettyprint pretty));
509 value_print_array_elements PARAMS ((value_ptr val, GDB_FILE * stream,
510 int format, enum val_prettyprint pretty));
513 value_release_to_mark PARAMS ((value_ptr mark));
516 val_print PARAMS ((struct type * type, char *valaddr, int embedded_offset, CORE_ADDR address,
517 GDB_FILE * stream, int format, int deref_ref,
518 int recurse, enum val_prettyprint pretty));
521 val_print_string PARAMS ((CORE_ADDR addr, int len, int width, GDB_FILE * stream));
524 print_variable_value PARAMS ((struct symbol * var, struct frame_info * frame,
527 extern int check_field PARAMS ((value_ptr, const char *));
530 c_typedef_print PARAMS ((struct type * type, struct symbol * news, GDB_FILE * stream));
533 internalvar_name PARAMS ((struct internalvar * var));
536 clear_value_history PARAMS ((void));
539 clear_internalvars PARAMS ((void));
543 extern value_ptr value_copy PARAMS ((value_ptr));
545 extern int baseclass_offset PARAMS ((struct type *, int, char *, CORE_ADDR));
549 extern value_ptr varying_to_slice PARAMS ((value_ptr));
551 extern value_ptr value_slice PARAMS ((value_ptr, int, int));
553 extern value_ptr call_function_by_hand PARAMS ((value_ptr, int, value_ptr *));
555 extern value_ptr value_literal_complex PARAMS ((value_ptr, value_ptr, struct type *));
557 extern void find_rt_vbase_offset PARAMS ((struct type *, struct type *, char *, int, int *, int *));
559 extern value_ptr find_function_in_inferior PARAMS ((char *));
561 extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
563 extern CORE_ADDR default_push_arguments PARAMS ((int nargs, value_ptr * args,
566 CORE_ADDR struct_addr));
568 #endif /* !defined (VALUE_H) */