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Fix use of @item vs. @itemx.
[deliverable/binutils-gdb.git] / gdb / value.h
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c906108c
SS		 1/* Definitions for values of C expressions, for GDB.
2 Copyright 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996
3 Free Software Foundation, Inc.
4
5This file is part of GDB.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21#if !defined (VALUE_H)
22#define VALUE_H 1
23
24/*
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).
28 */
29enum lval_type {
30 /* Not an lval. */
31 not_lval,
32 /* In memory. Could be a saved register. */
33 lval_memory,
34 /* In a register. */
35 lval_register,
36 /* In a gdb internal variable. */
37 lval_internalvar,
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
44};
45
46struct value
47 {
48 /* Type of value; either not an lval, or one of the various
49 different possible kinds of lval. */
50 enum lval_type lval;
51 /* Is it modifiable? Only relevant if lval != not_lval. */
52 int modifiable;
53 /* Location of value (if lval). */
54 union
55 {
56 /* Address in inferior or byte of registers structure. */
57 CORE_ADDR address;
58 /* Pointer to internal variable. */
59 struct internalvar *internalvar;
60 /* Number of register. Only used with
61 lval_reg_frame_relative. */
62 int regnum;
63 } location;
64 /* Describes offset of a value within lval of a structure in bytes.
65 This is used in retrieving contents from target memory. [Note also
66 the member embedded_offset below.] */
67 int offset;
68 /* Only used for bitfields; number of bits contained in them. */
69 int bitsize;
70 /* Only used for bitfields; position of start of field.
71 For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
72 For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
73 int bitpos;
74 /* Frame value is relative to. In practice, this address is only
75 used if the value is stored in several registers in other than
76 the current frame, and these registers have not all been saved
77 at the same place in memory. This will be described in the
78 lval enum above as "lval_reg_frame_relative". */
79 CORE_ADDR frame_addr;
80 /* Type of the value. */
81 struct type *type;
82 /* Type of the enclosing object if this is an embedded subobject.
83 The member embedded_offset gives the real position of the subobject
84 if type is not the same as enclosing_type.
85
86 If the type field is a pointer type, then enclosing_type is
87 a pointer type pointing to the real (enclosing) type of the target
88 object. */
89 struct type *enclosing_type;
90 /* Values are stored in a chain, so that they can be deleted
91 easily over calls to the inferior. Values assigned to internal
92 variables or put into the value history are taken off this
93 list. */
94 struct value *next;
95
96 /* ??? When is this used? */
97 union {
98 CORE_ADDR memaddr;
99 char *myaddr;
100 } substring_addr;
101
102 /* Register number if the value is from a register. Is not kept
103 if you take a field of a structure that is stored in a
104 register. Shouldn't it be? */
105 short regno;
106 /* If zero, contents of this value are in the contents field.
107 If nonzero, contents are in inferior memory at address
108 in the location.address field plus the offset field
109 (and the lval field should be lval_memory). */
110 char lazy;
111 /* If nonzero, this is the value of a variable which does not
112 actually exist in the program. */
113 char optimized_out;
114 /* If this value represents an object that is embedded inside a
115 larger object (e.g., a base subobject in C++), this gives the
116 offset (in bytes) from the start of the contents buffer where
117 the embedded object begins. This is required because some C++
118 runtime implementations lay out objects (especially virtual bases
119 with possibly negative offsets to ancestors).
120 Note: This may be positive or negative! Also note that this offset
121 is not used when retrieving contents from target memory; the entire
122 enclosing object has to be retrieved always, and the offset for
123 that is given by the member offset above. */
124 int embedded_offset;
125 /* If this value represents a pointer to an object that is embedded
126 in another object, this gives the embedded_offset of the object
127 that is pointed to. */
128 int pointed_to_offset;
129 /* The BFD section associated with this value. */
130 asection *bfd_section;
131 /* Actual contents of the value. For use of this value; setting
132 it uses the stuff above. Not valid if lazy is nonzero.
133 Target byte-order. We force it to be aligned properly for any
134 possible value. Note that a value therefore extends beyond
135 what is declared here. */
136 union {
137 long contents[1];
138 double force_double_align;
139 LONGEST force_longlong_align;
140 char *literal_data;
141 } aligner;
142 /* Do not add any new members here -- contents above will trash them */
143 };
144
145typedef struct value *value_ptr;
146
147#define VALUE_TYPE(val) (val)->type
148#define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_type
149#define VALUE_LAZY(val) (val)->lazy
150/* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
151 the gdb buffer used to hold a copy of the contents of the lval.
152 VALUE_CONTENTS is used when the contents of the buffer are needed --
153 it uses value_fetch_lazy() to load the buffer from the process being
154 debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
155 used when data is being stored into the buffer, or when it is
156 certain that the contents of the buffer are valid.
157 Note: The contents pointer is adjusted by the offset required to
158 get to the real subobject, if the value happens to represent
159 something embedded in a larger run-time object. */
160
161#define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
162#define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
163 VALUE_CONTENTS_RAW(val))
164
165/* The ALL variants of the above two macros do not adjust the returned
166 pointer by the embedded_offset value. */
167
168#define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
169#define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
170 VALUE_CONTENTS_ALL_RAW(val))
171
172
173extern int value_fetch_lazy PARAMS ((value_ptr val));
174
175#define VALUE_LVAL(val) (val)->lval
176#define VALUE_ADDRESS(val) (val)->location.address
177#define VALUE_INTERNALVAR(val) (val)->location.internalvar
178#define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
179#define VALUE_FRAME(val) ((val)->frame_addr)
180#define VALUE_OFFSET(val) (val)->offset
181#define VALUE_BITSIZE(val) (val)->bitsize
182#define VALUE_BITPOS(val) (val)->bitpos
183#define VALUE_NEXT(val) (val)->next
184#define VALUE_REGNO(val) (val)->regno
185#define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
186#define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
187#define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
188#define VALUE_BFD_SECTION(val) ((val)->bfd_section)
189
190/* Convert a REF to the object referenced. */
191
192#define COERCE_REF(arg) \
193do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
194 if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
195 arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
196 unpack_long (VALUE_TYPE (arg), \
197 VALUE_CONTENTS (arg)), \
198 VALUE_BFD_SECTION (arg)); \
199 } while (0)
200
201/* If ARG is an array, convert it to a pointer.
202 If ARG is an enum, convert it to an integer.
203 If ARG is a function, convert it to a function pointer.
204
205 References are dereferenced. */
206
207#define COERCE_ARRAY(arg) \
208do { COERCE_REF(arg); \
209 if (current_language->c_style_arrays \
210 && TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
211 arg = value_coerce_array (arg); \
212 if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
213 arg = value_coerce_function (arg); \
214} while (0)
215
216#define COERCE_NUMBER(arg) \
217 do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
218
219#define COERCE_VARYING_ARRAY(arg, real_arg_type) \
220{ if (chill_varying_type (real_arg_type)) \
221 arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
222
223/* If ARG is an enum, convert it to an integer. */
224
225#define COERCE_ENUM(arg) { \
226 if (TYPE_CODE (check_typedef (VALUE_TYPE (arg))) == TYPE_CODE_ENUM) \
227 arg = value_cast (builtin_type_unsigned_int, arg); \
228}
229
230/* Internal variables (variables for convenience of use of debugger)
231 are recorded as a chain of these structures. */
232
233struct internalvar
234{
235 struct internalvar *next;
236 char *name;
237 value_ptr value;
238};
239
240/* Pointer to member function. Depends on compiler implementation. */
241
242#define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
243#define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
244#define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
245
246\f
247#include "symtab.h"
248#include "gdbtypes.h"
249#include "expression.h"
250
251#ifdef __STDC__
252struct frame_info;
253struct fn_field;
254#endif
255
256extern void
257print_address_demangle PARAMS ((CORE_ADDR, GDB_FILE *, int));
258
259extern LONGEST value_as_long PARAMS ((value_ptr val));
260
261extern DOUBLEST value_as_double PARAMS ((value_ptr val));
262
263extern CORE_ADDR value_as_pointer PARAMS ((value_ptr val));
264
265extern LONGEST unpack_long PARAMS ((struct type *type, char *valaddr));
266
267extern DOUBLEST unpack_double PARAMS ((struct type *type, char *valaddr,
268 int *invp));
269
270extern CORE_ADDR unpack_pointer PARAMS ((struct type *type, char *valaddr));
271
272extern LONGEST unpack_field_as_long PARAMS ((struct type *type, char *valaddr,
273 int fieldno));
274
275extern value_ptr value_from_longest PARAMS ((struct type *type, LONGEST num));
276
277extern value_ptr value_from_double PARAMS ((struct type *type, DOUBLEST num));
278
279extern value_ptr value_at PARAMS ((struct type *type, CORE_ADDR addr, asection *sect));
280
281extern value_ptr value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr, asection *sect));
282
283extern value_ptr value_from_register PARAMS ((struct type *type, int regnum,
284 struct frame_info * frame));
285
286extern value_ptr value_of_variable PARAMS ((struct symbol *var,
287 struct block *b));
288
289extern value_ptr value_of_register PARAMS ((int regnum));
290
291extern int symbol_read_needs_frame PARAMS ((struct symbol *));
292
293extern value_ptr read_var_value PARAMS ((struct symbol *var,
294 struct frame_info *frame));
295
296extern value_ptr locate_var_value PARAMS ((struct symbol *var,
297 struct frame_info *frame));
298
299extern value_ptr allocate_value PARAMS ((struct type *type));
300
301extern value_ptr allocate_repeat_value PARAMS ((struct type *type, int count));
302
303extern value_ptr value_mark PARAMS ((void));
304
305extern void value_free_to_mark PARAMS ((value_ptr mark));
306
307extern value_ptr value_string PARAMS ((char *ptr, int len));
308extern value_ptr value_bitstring PARAMS ((char *ptr, int len));
309
310extern value_ptr value_array PARAMS ((int lowbound, int highbound,
311 value_ptr *elemvec));
312
313extern value_ptr value_concat PARAMS ((value_ptr arg1, value_ptr arg2));
314
315extern value_ptr value_binop PARAMS ((value_ptr arg1, value_ptr arg2,
316 enum exp_opcode op));
317
318extern value_ptr value_add PARAMS ((value_ptr arg1, value_ptr arg2));
319
320extern value_ptr value_sub PARAMS ((value_ptr arg1, value_ptr arg2));
321
322extern value_ptr value_coerce_array PARAMS ((value_ptr arg1));
323
324extern value_ptr value_coerce_function PARAMS ((value_ptr arg1));
325
326extern value_ptr value_ind PARAMS ((value_ptr arg1));
327
328extern value_ptr value_addr PARAMS ((value_ptr arg1));
329
330extern value_ptr value_assign PARAMS ((value_ptr toval, value_ptr fromval));
331
332extern value_ptr value_neg PARAMS ((value_ptr arg1));
333
334extern value_ptr value_complement PARAMS ((value_ptr arg1));
335
336extern value_ptr value_struct_elt PARAMS ((value_ptr *argp, value_ptr *args,
337 char *name,
338 int *static_memfuncp, char *err));
339
340extern value_ptr value_struct_elt_for_reference PARAMS ((struct type *domain,
341 int offset,
342 struct type *curtype,
343 char *name,
344 struct type *intype));
345
346extern value_ptr value_static_field PARAMS ((struct type *type, int fieldno));
347
7a292a7a
SS		 348extern struct fn_field *value_find_oload_method_list PARAMS ((value_ptr *, char *, int, int *, int *, struct type **, int *));
349
350extern 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));
c906108c
SS		 351
352extern value_ptr value_field PARAMS ((value_ptr arg1, int fieldno));
353
354extern value_ptr value_primitive_field PARAMS ((value_ptr arg1, int offset,
355 int fieldno,
356 struct type *arg_type));
357
358extern struct type *
359value_rtti_type PARAMS ((value_ptr, int *, int *, int *));
360
361extern struct type *
362value_rtti_target_type PARAMS ((value_ptr, int *, int *, int *));
363
364extern value_ptr
365value_full_object PARAMS ((value_ptr, struct type *, int, int, int));
366
367extern value_ptr value_cast PARAMS ((struct type *type, value_ptr arg2));
368
369extern value_ptr value_zero PARAMS ((struct type *type, enum lval_type lv));
370
371extern value_ptr value_repeat PARAMS ((value_ptr arg1, int count));
372
373extern value_ptr value_subscript PARAMS ((value_ptr array, value_ptr idx));
374
375extern value_ptr value_from_vtable_info PARAMS ((value_ptr arg,
376 struct type *type));
377
378extern value_ptr value_being_returned PARAMS ((struct type *valtype,
7a292a7a 379 char *retbuf,
c906108c
SS		 380 int struct_return));
381
382extern value_ptr value_in PARAMS ((value_ptr element, value_ptr set));
383
384extern int value_bit_index PARAMS ((struct type *type, char *addr, int index));
385
386extern int using_struct_return PARAMS ((value_ptr function, CORE_ADDR funcaddr,
387 struct type *value_type, int gcc_p));
388
389extern void set_return_value PARAMS ((value_ptr val));
390
391extern value_ptr evaluate_expression PARAMS ((struct expression *exp));
392
393extern value_ptr evaluate_type PARAMS ((struct expression *exp));
394
395extern value_ptr evaluate_subexp_with_coercion PARAMS ((struct expression *,
396 int *, enum noside));
397
398extern value_ptr parse_and_eval PARAMS ((char *exp));
399
400extern value_ptr parse_to_comma_and_eval PARAMS ((char **expp));
401
402extern struct type *parse_and_eval_type PARAMS ((char *p, int length));
403
404extern CORE_ADDR parse_and_eval_address PARAMS ((char *exp));
405
406extern CORE_ADDR parse_and_eval_address_1 PARAMS ((char **expptr));
407
408extern value_ptr access_value_history PARAMS ((int num));
409
410extern value_ptr value_of_internalvar PARAMS ((struct internalvar *var));
411
412extern void set_internalvar PARAMS ((struct internalvar *var, value_ptr val));
413
414extern void set_internalvar_component PARAMS ((struct internalvar *var,
415 int offset,
416 int bitpos, int bitsize,
417 value_ptr newvalue));
418
419extern struct internalvar *lookup_internalvar PARAMS ((char *name));
420
421extern int value_equal PARAMS ((value_ptr arg1, value_ptr arg2));
422
423extern int value_less PARAMS ((value_ptr arg1, value_ptr arg2));
424
425extern int value_logical_not PARAMS ((value_ptr arg1));
426
427/* C++ */
428
429extern value_ptr value_of_this PARAMS ((int complain));
430
431extern value_ptr value_x_binop PARAMS ((value_ptr arg1, value_ptr arg2,
432 enum exp_opcode op,
433 enum exp_opcode otherop,
434 enum noside noside));
435
436extern value_ptr value_x_unop PARAMS ((value_ptr arg1, enum exp_opcode op,
437 enum noside noside));
438
439extern value_ptr value_fn_field PARAMS ((value_ptr *arg1p, struct fn_field *f,
440 int j,
441 struct type* type, int offset));
442
443extern value_ptr value_virtual_fn_field PARAMS ((value_ptr *arg1p,
444 struct fn_field *f, int j,
445 struct type *type,
446 int offset));
447
448extern int binop_user_defined_p PARAMS ((enum exp_opcode op,
449 value_ptr arg1, value_ptr arg2));
450
451extern int unop_user_defined_p PARAMS ((enum exp_opcode op, value_ptr arg1));
452
453extern int destructor_name_p PARAMS ((const char *name,
454 const struct type *type));
455
456#define value_free(val) free ((PTR)val)
457
458extern void free_all_values PARAMS ((void));
459
460extern void release_value PARAMS ((value_ptr val));
461
462extern int record_latest_value PARAMS ((value_ptr val));
463
464extern void registers_changed PARAMS ((void));
465
466extern void read_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
467
468extern void write_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
469
470extern void
471read_register_gen PARAMS ((int regno, char *myaddr));
472
473extern CORE_ADDR
474read_register PARAMS ((int regno));
475
476extern CORE_ADDR
477read_register_pid PARAMS ((int regno, int pid));
478
479extern void
480write_register PARAMS ((int regno, LONGEST val));
481
482extern void
483write_register_pid PARAMS ((int regno, CORE_ADDR val, int pid));
484
485extern void
486supply_register PARAMS ((int regno, char *val));
487
7a292a7a
SS		 488extern void get_saved_register PARAMS ((char *raw_buffer, int *optimized,
489 CORE_ADDR *addrp,
490 struct frame_info *frame,
491 int regnum, enum lval_type *lval));
c906108c
SS		 492
493extern void
494modify_field PARAMS ((char *addr, LONGEST fieldval, int bitpos, int bitsize));
495
496extern void
497type_print PARAMS ((struct type *type, char *varstring, GDB_FILE *stream,
498 int show));
499
500extern char *baseclass_addr PARAMS ((struct type *type, int index,
501 char *valaddr,
502 value_ptr *valuep, int *errp));
503
504extern void
505print_longest PARAMS ((GDB_FILE *stream, int format, int use_local,
506 LONGEST val));
507
508extern void
509print_floating PARAMS ((char *valaddr, struct type *type, GDB_FILE *stream));
510
511extern int value_print PARAMS ((value_ptr val, GDB_FILE *stream, int format,
512 enum val_prettyprint pretty));
513
514extern void
515value_print_array_elements PARAMS ((value_ptr val, GDB_FILE* stream,
516 int format, enum val_prettyprint pretty));
517
518extern value_ptr
519value_release_to_mark PARAMS ((value_ptr mark));
520
521extern int
522val_print PARAMS ((struct type *type, char *valaddr, int embedded_offset, CORE_ADDR address,
523 GDB_FILE *stream, int format, int deref_ref,
524 int recurse, enum val_prettyprint pretty));
525
526extern int
527val_print_string PARAMS ((CORE_ADDR addr, int len, int width, GDB_FILE *stream));
528
529extern void
530print_variable_value PARAMS ((struct symbol *var, struct frame_info *frame,
531 GDB_FILE *stream));
532
533extern int check_field PARAMS ((value_ptr, const char *));
534
535extern void
536c_typedef_print PARAMS ((struct type *type, struct symbol *news, GDB_FILE *stream));
537
538extern char *
539internalvar_name PARAMS ((struct internalvar *var));
540
541extern void
542clear_value_history PARAMS ((void));
543
544extern void
545clear_internalvars PARAMS ((void));
546
547/* From values.c */
548
549extern value_ptr value_copy PARAMS ((value_ptr));
550
551extern int baseclass_offset PARAMS ((struct type *, int, char *, CORE_ADDR));
552
553/* From valops.c */
554
555extern value_ptr varying_to_slice PARAMS ((value_ptr));
556
557extern value_ptr value_slice PARAMS ((value_ptr, int, int));
558
559extern value_ptr call_function_by_hand PARAMS ((value_ptr, int, value_ptr *));
560
561extern value_ptr value_literal_complex PARAMS ((value_ptr, value_ptr, struct type*));
562
563extern void find_rt_vbase_offset PARAMS ((struct type *, struct type *, char *, int, int *, int *));
564
565extern value_ptr find_function_in_inferior PARAMS ((char *));
566
567extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
568
392a587b 569extern CORE_ADDR default_push_arguments PARAMS ((int nargs, value_ptr *args,
392a587b 570 CORE_ADDR sp,
ac9a91a7 571 int struct_return,
392a587b
JM		 572 CORE_ADDR struct_addr));
573
c906108c 574#endif /* !defined (VALUE_H) */
GDB Binutils - Deliverables
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