xref: /dragonfly/contrib/gdb-7/gdb/value.h (revision ef5ccd6c)
1 /* Definitions for values of C expressions, for GDB.
2 
3    Copyright (C) 1986-2013 Free Software Foundation, Inc.
4 
5    This file is part of GDB.
6 
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 3 of the License, or
10    (at your option) any later version.
11 
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.
16 
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19 
20 #if !defined (VALUE_H)
21 #define VALUE_H 1
22 
23 #include "doublest.h"
24 #include "frame.h"		/* For struct frame_id.  */
25 
26 struct block;
27 struct expression;
28 struct regcache;
29 struct symbol;
30 struct type;
31 struct ui_file;
32 struct language_defn;
33 struct value_print_options;
34 
35 /* The structure which defines the type of a value.  It should never
36    be possible for a program lval value to survive over a call to the
37    inferior (i.e. to be put into the history list or an internal
38    variable).  */
39 
40 struct value;
41 
42 /* Values are stored in a chain, so that they can be deleted easily
43    over calls to the inferior.  Values assigned to internal variables,
44    put into the value history or exposed to Python are taken off this
45    list.  */
46 
47 struct value *value_next (struct value *);
48 
49 /* Type of the value.  */
50 
51 extern struct type *value_type (const struct value *);
52 
53 /* This is being used to change the type of an existing value, that
54    code should instead be creating a new value with the changed type
55    (but possibly shared content).  */
56 
57 extern void deprecated_set_value_type (struct value *value,
58 				       struct type *type);
59 
60 /* Only used for bitfields; number of bits contained in them.  */
61 
62 extern int value_bitsize (const struct value *);
63 extern void set_value_bitsize (struct value *, int bit);
64 
65 /* Only used for bitfields; position of start of field.  For
66    gdbarch_bits_big_endian=0 targets, it is the position of the LSB.  For
67    gdbarch_bits_big_endian=1 targets, it is the position of the MSB.  */
68 
69 extern int value_bitpos (const struct value *);
70 extern void set_value_bitpos (struct value *, int bit);
71 
72 /* Only used for bitfields; the containing value.  This allows a
73    single read from the target when displaying multiple
74    bitfields.  */
75 
76 struct value *value_parent (struct value *);
77 extern void set_value_parent (struct value *value, struct value *parent);
78 
79 /* Describes offset of a value within lval of a structure in bytes.
80    If lval == lval_memory, this is an offset to the address.  If lval
81    == lval_register, this is a further offset from location.address
82    within the registers structure.  Note also the member
83    embedded_offset below.  */
84 
85 extern int value_offset (const struct value *);
86 extern void set_value_offset (struct value *, int offset);
87 
88 /* The comment from "struct value" reads: ``Is it modifiable?  Only
89    relevant if lval != not_lval.''.  Shouldn't the value instead be
90    not_lval and be done with it?  */
91 
92 extern int deprecated_value_modifiable (struct value *value);
93 
94 /* If a value represents a C++ object, then the `type' field gives the
95    object's compile-time type.  If the object actually belongs to some
96    class derived from `type', perhaps with other base classes and
97    additional members, then `type' is just a subobject of the real
98    thing, and the full object is probably larger than `type' would
99    suggest.
100 
101    If `type' is a dynamic class (i.e. one with a vtable), then GDB can
102    actually determine the object's run-time type by looking at the
103    run-time type information in the vtable.  When this information is
104    available, we may elect to read in the entire object, for several
105    reasons:
106 
107    - When printing the value, the user would probably rather see the
108      full object, not just the limited portion apparent from the
109      compile-time type.
110 
111    - If `type' has virtual base classes, then even printing `type'
112      alone may require reaching outside the `type' portion of the
113      object to wherever the virtual base class has been stored.
114 
115    When we store the entire object, `enclosing_type' is the run-time
116    type -- the complete object -- and `embedded_offset' is the offset
117    of `type' within that larger type, in bytes.  The value_contents()
118    macro takes `embedded_offset' into account, so most GDB code
119    continues to see the `type' portion of the value, just as the
120    inferior would.
121 
122    If `type' is a pointer to an object, then `enclosing_type' is a
123    pointer to the object's run-time type, and `pointed_to_offset' is
124    the offset in bytes from the full object to the pointed-to object
125    -- that is, the value `embedded_offset' would have if we followed
126    the pointer and fetched the complete object.  (I don't really see
127    the point.  Why not just determine the run-time type when you
128    indirect, and avoid the special case?  The contents don't matter
129    until you indirect anyway.)
130 
131    If we're not doing anything fancy, `enclosing_type' is equal to
132    `type', and `embedded_offset' is zero, so everything works
133    normally.  */
134 
135 extern struct type *value_enclosing_type (struct value *);
136 extern void set_value_enclosing_type (struct value *val,
137 				      struct type *new_type);
138 
139 /* Returns value_type or value_enclosing_type depending on
140    value_print_options.objectprint.
141 
142    If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
143    only for pointers and references, else it will be returned
144    for all the types (e.g. structures).  This option is useful
145    to prevent retrieving enclosing type for the base classes fields.
146 
147    REAL_TYPE_FOUND is used to inform whether the real type was found
148    (or just static type was used).  The NULL may be passed if it is not
149    necessary. */
150 
151 extern struct type *value_actual_type (struct value *value,
152 				       int resolve_simple_types,
153 				       int *real_type_found);
154 
155 extern int value_pointed_to_offset (struct value *value);
156 extern void set_value_pointed_to_offset (struct value *value, int val);
157 extern int value_embedded_offset (struct value *value);
158 extern void set_value_embedded_offset (struct value *value, int val);
159 
160 /* For lval_computed values, this structure holds functions used to
161    retrieve and set the value (or portions of the value).
162 
163    For each function, 'V' is the 'this' pointer: an lval_funcs
164    function F may always assume that the V it receives is an
165    lval_computed value, and has F in the appropriate slot of its
166    lval_funcs structure.  */
167 
168 struct lval_funcs
169 {
170   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
171      a problem arises in obtaining VALUE's bits, this function should
172      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
173      non-optimized-out value is an internal error.  */
174   void (*read) (struct value *v);
175 
176   /* Handle an assignment TOVAL = FROMVAL by writing the value of
177      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
178      been updated.  If a problem arises in doing so, this function
179      should call 'error'.  If it is NULL such TOVAL assignment is an error as
180      TOVAL is not considered as an lvalue.  */
181   void (*write) (struct value *toval, struct value *fromval);
182 
183   /* Check the validity of some bits in VALUE.  This should return 1
184      if all the bits starting at OFFSET and extending for LENGTH bits
185      are valid, or 0 if any bit is invalid.  */
186   int (*check_validity) (const struct value *value, int offset, int length);
187 
188   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
189   int (*check_any_valid) (const struct value *value);
190 
191   /* If non-NULL, this is used to implement pointer indirection for
192      this value.  This method may return NULL, in which case value_ind
193      will fall back to ordinary indirection.  */
194   struct value *(*indirect) (struct value *value);
195 
196   /* If non-NULL, this is used to implement reference resolving for
197      this value.  This method may return NULL, in which case coerce_ref
198      will fall back to ordinary references resolving.  */
199   struct value *(*coerce_ref) (const struct value *value);
200 
201   /* If non-NULL, this is used to determine whether the indicated bits
202      of VALUE are a synthetic pointer.  */
203   int (*check_synthetic_pointer) (const struct value *value,
204 				  int offset, int length);
205 
206   /* Return a duplicate of VALUE's closure, for use in a new value.
207      This may simply return the same closure, if VALUE's is
208      reference-counted or statically allocated.
209 
210      This may be NULL, in which case VALUE's closure is re-used in the
211      new value.  */
212   void *(*copy_closure) (const struct value *v);
213 
214   /* Drop VALUE's reference to its closure.  Maybe this frees the
215      closure; maybe this decrements a reference count; maybe the
216      closure is statically allocated and this does nothing.
217 
218      This may be NULL, in which case no action is taken to free
219      VALUE's closure.  */
220   void (*free_closure) (struct value *v);
221 };
222 
223 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
224    and closure CLOSURE.  */
225 
226 extern struct value *allocate_computed_value (struct type *type,
227 					      const struct lval_funcs *funcs,
228 					      void *closure);
229 
230 /* Helper function to check the validity of some bits of a value.
231 
232    If TYPE represents some aggregate type (e.g., a structure), return 1.
233 
234    Otherwise, any of the bytes starting at OFFSET and extending for
235    TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
236    return 0.  The checking is done using FUNCS.
237 
238    Otherwise, return 1.  */
239 
240 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
241 				    int embedded_offset,
242 				    const struct value *val);
243 
244 extern struct value *allocate_optimized_out_value (struct type *type);
245 
246 /* If VALUE is lval_computed, return its lval_funcs structure.  */
247 
248 extern const struct lval_funcs *value_computed_funcs (const struct value *);
249 
250 /* If VALUE is lval_computed, return its closure.  The meaning of the
251    returned value depends on the functions VALUE uses.  */
252 
253 extern void *value_computed_closure (const struct value *value);
254 
255 /* If zero, contents of this value are in the contents field.  If
256    nonzero, contents are in inferior.  If the lval field is lval_memory,
257    the contents are in inferior memory at location.address plus offset.
258    The lval field may also be lval_register.
259 
260    WARNING: This field is used by the code which handles watchpoints
261    (see breakpoint.c) to decide whether a particular value can be
262    watched by hardware watchpoints.  If the lazy flag is set for some
263    member of a value chain, it is assumed that this member of the
264    chain doesn't need to be watched as part of watching the value
265    itself.  This is how GDB avoids watching the entire struct or array
266    when the user wants to watch a single struct member or array
267    element.  If you ever change the way lazy flag is set and reset, be
268    sure to consider this use as well!  */
269 
270 extern int value_lazy (struct value *);
271 extern void set_value_lazy (struct value *value, int val);
272 
273 extern int value_stack (struct value *);
274 extern void set_value_stack (struct value *value, int val);
275 
276 /* value_contents() and value_contents_raw() both return the address
277    of the gdb buffer used to hold a copy of the contents of the lval.
278    value_contents() is used when the contents of the buffer are needed
279    -- it uses value_fetch_lazy() to load the buffer from the process
280    being debugged if it hasn't already been loaded
281    (value_contents_writeable() is used when a writeable but fetched
282    buffer is required)..  value_contents_raw() is used when data is
283    being stored into the buffer, or when it is certain that the
284    contents of the buffer are valid.
285 
286    Note: The contents pointer is adjusted by the offset required to
287    get to the real subobject, if the value happens to represent
288    something embedded in a larger run-time object.  */
289 
290 extern gdb_byte *value_contents_raw (struct value *);
291 
292 /* Actual contents of the value.  For use of this value; setting it
293    uses the stuff above.  Not valid if lazy is nonzero.  Target
294    byte-order.  We force it to be aligned properly for any possible
295    value.  Note that a value therefore extends beyond what is
296    declared here.  */
297 
298 extern const gdb_byte *value_contents (struct value *);
299 extern gdb_byte *value_contents_writeable (struct value *);
300 
301 /* The ALL variants of the above two macros do not adjust the returned
302    pointer by the embedded_offset value.  */
303 
304 extern gdb_byte *value_contents_all_raw (struct value *);
305 extern const gdb_byte *value_contents_all (struct value *);
306 
307 /* Like value_contents_all, but does not require that the returned
308    bits be valid.  This should only be used in situations where you
309    plan to check the validity manually.  */
310 extern const gdb_byte *value_contents_for_printing (struct value *value);
311 
312 /* Like value_contents_for_printing, but accepts a constant value
313    pointer.  Unlike value_contents_for_printing however, the pointed
314    value must _not_ be lazy.  */
315 extern const gdb_byte *
316   value_contents_for_printing_const (const struct value *value);
317 
318 extern int value_fetch_lazy (struct value *val);
319 extern int value_contents_equal (struct value *val1, struct value *val2);
320 
321 /* If nonzero, this is the value of a variable which does not actually
322    exist in the program.  */
323 extern int value_optimized_out (struct value *value);
324 extern void set_value_optimized_out (struct value *value, int val);
325 
326 /* Like value_optimized_out, but return false if any bit in the object
327    is valid.  */
328 extern int value_entirely_optimized_out (const struct value *value);
329 
330 /* Set or return field indicating whether a variable is initialized or
331    not, based on debugging information supplied by the compiler.
332    1 = initialized; 0 = uninitialized.  */
333 extern int value_initialized (struct value *);
334 extern void set_value_initialized (struct value *, int);
335 
336 /* Set COMPONENT's location as appropriate for a component of WHOLE
337    --- regardless of what kind of lvalue WHOLE is.  */
338 extern void set_value_component_location (struct value *component,
339                                           const struct value *whole);
340 
341 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
342    single value might have multiple LVALs), this hacked interface is
343    limited to just the first PIECE.  Expect further change.  */
344 /* Type of value; either not an lval, or one of the various different
345    possible kinds of lval.  */
346 extern enum lval_type *deprecated_value_lval_hack (struct value *);
347 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
348 
349 /* Like VALUE_LVAL, except the parameter can be const.  */
350 extern enum lval_type value_lval_const (const struct value *value);
351 
352 /* If lval == lval_memory, return the address in the inferior.  If
353    lval == lval_register, return the byte offset into the registers
354    structure.  Otherwise, return 0.  The returned address
355    includes the offset, if any.  */
356 extern CORE_ADDR value_address (const struct value *);
357 
358 /* Like value_address, except the result does not include value's
359    offset.  */
360 extern CORE_ADDR value_raw_address (struct value *);
361 
362 /* Set the address of a value.  */
363 extern void set_value_address (struct value *, CORE_ADDR);
364 
365 /* Pointer to internal variable.  */
366 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
367 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
368 
369 /* Frame register value is relative to.  This will be described in the
370    lval enum above as "lval_register".  */
371 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
372 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
373 
374 /* Register number if the value is from a register.  */
375 extern short *deprecated_value_regnum_hack (struct value *);
376 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
377 
378 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
379    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
380 
381 extern struct value *coerce_ref_if_computed (const struct value *arg);
382 
383 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
384    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
385    ORIGINAL_VAL are the type and value of the original reference or pointer.
386 
387    Note, that VALUE is modified by this function.
388 
389    It is a common implementation for coerce_ref and value_ind.  */
390 
391 extern struct value * readjust_indirect_value_type (struct value *value,
392 						    struct type *enc_type,
393 						    struct type *original_type,
394 						    struct value *original_val);
395 
396 /* Convert a REF to the object referenced.  */
397 
398 extern struct value *coerce_ref (struct value *value);
399 
400 /* If ARG is an array, convert it to a pointer.
401    If ARG is a function, convert it to a function pointer.
402 
403    References are dereferenced.  */
404 
405 extern struct value *coerce_array (struct value *value);
406 
407 /* Given a value, determine whether the bits starting at OFFSET and
408    extending for LENGTH bits are valid.  This returns nonzero if all
409    bits in the given range are valid, zero if any bit is invalid.  */
410 
411 extern int value_bits_valid (const struct value *value,
412 			     int offset, int length);
413 
414 /* Given a value, determine whether the bits starting at OFFSET and
415    extending for LENGTH bits are a synthetic pointer.  */
416 
417 extern int value_bits_synthetic_pointer (const struct value *value,
418 					 int offset, int length);
419 
420 /* Given a value, determine whether the contents bytes starting at
421    OFFSET and extending for LENGTH bytes are available.  This returns
422    nonzero if all bytes in the given range are available, zero if any
423    byte is unavailable.  */
424 
425 extern int value_bytes_available (const struct value *value,
426 				  int offset, int length);
427 
428 /* Like value_bytes_available, but return false if any byte in the
429    whole object is unavailable.  */
430 extern int value_entirely_available (struct value *value);
431 
432 /* Mark VALUE's content bytes starting at OFFSET and extending for
433    LENGTH bytes as unavailable.  */
434 
435 extern void mark_value_bytes_unavailable (struct value *value,
436 					  int offset, int length);
437 
438 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
439    LENGTH bytes of VAL2's contents starting at OFFSET2.
440 
441    Note that "contents" refers to the whole value's contents
442    (value_contents_all), without any embedded offset adjustment.  For
443    example, to compare a complete object value with itself, including
444    its enclosing type chunk, you'd do:
445 
446      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
447      value_available_contents (val, 0, val, 0, len);
448 
449    Returns true iff the set of available contents match.  Unavailable
450    contents compare equal with unavailable contents, and different
451    with any available byte.  For example, if 'x's represent an
452    unavailable byte, and 'V' and 'Z' represent different available
453    bytes, in a value with length 16:
454 
455    offset:   0   4   8   12  16
456    contents: xxxxVVVVxxxxVVZZ
457 
458    then:
459 
460    value_available_contents_eq(val, 0, val, 8, 6) => 1
461    value_available_contents_eq(val, 0, val, 4, 4) => 1
462    value_available_contents_eq(val, 0, val, 8, 8) => 0
463    value_available_contents_eq(val, 4, val, 12, 2) => 1
464    value_available_contents_eq(val, 4, val, 12, 4) => 0
465    value_available_contents_eq(val, 3, val, 4, 4) => 0
466 
467    We only know whether a value chunk is available if we've tried to
468    read it.  As this routine is used by printing routines, which may
469    be printing values in the value history, long after the inferior is
470    gone, it works with const values.  Therefore, this routine must not
471    be called with lazy values.  */
472 
473 extern int value_available_contents_eq (const struct value *val1, int offset1,
474 					const struct value *val2, int offset2,
475 					int length);
476 
477 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
478    is (or will be copied to) VAL's contents buffer offset by
479    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
480    Marks value contents ranges as unavailable if the corresponding
481    memory is likewise unavailable.  STACK indicates whether the memory
482    is known to be stack memory.  */
483 
484 extern void read_value_memory (struct value *val, int embedded_offset,
485 			       int stack, CORE_ADDR memaddr,
486 			       gdb_byte *buffer, size_t length);
487 
488 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
489    into each element of a new vector value with VECTOR_TYPE.  */
490 
491 struct value *value_vector_widen (struct value *scalar_value,
492 				  struct type *vector_type);
493 
494 
495 
496 #include "symtab.h"
497 #include "gdbtypes.h"
498 #include "expression.h"
499 
500 struct frame_info;
501 struct fn_field;
502 
503 extern int print_address_demangle (const struct value_print_options *,
504 				   struct gdbarch *, CORE_ADDR,
505 				   struct ui_file *, int);
506 
507 extern LONGEST value_as_long (struct value *val);
508 extern DOUBLEST value_as_double (struct value *val);
509 extern CORE_ADDR value_as_address (struct value *val);
510 
511 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
512 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
513 			       int *invp);
514 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
515 
516 extern int unpack_value_bits_as_long (struct type *field_type,
517 				      const gdb_byte *valaddr,
518 				      int embedded_offset, int bitpos,
519 				      int bitsize,
520 				      const struct value *original_value,
521 				      LONGEST *result);
522 
523 extern LONGEST unpack_field_as_long (struct type *type,
524 				     const gdb_byte *valaddr,
525 				     int fieldno);
526 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
527 				int embedded_offset, int fieldno,
528 				const struct value *val, LONGEST *result);
529 
530 extern struct value *value_field_bitfield (struct type *type, int fieldno,
531 					   const gdb_byte *valaddr,
532 					   int embedded_offset,
533 					   const struct value *val);
534 
535 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
536 
537 extern struct value *value_from_longest (struct type *type, LONGEST num);
538 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
539 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
540 extern struct value *value_from_double (struct type *type, DOUBLEST num);
541 extern struct value *value_from_decfloat (struct type *type,
542 					  const gdb_byte *decbytes);
543 extern struct value *value_from_history_ref (char *, char **);
544 
545 extern struct value *value_at (struct type *type, CORE_ADDR addr);
546 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
547 
548 extern struct value *value_from_contents_and_address (struct type *,
549 						      const gdb_byte *,
550 						      CORE_ADDR);
551 extern struct value *value_from_contents (struct type *, const gdb_byte *);
552 
553 extern struct value *default_value_from_register (struct type *type,
554 						  int regnum,
555 						  struct frame_info *frame);
556 
557 extern void read_frame_register_value (struct value *value,
558 				       struct frame_info *frame);
559 
560 extern struct value *value_from_register (struct type *type, int regnum,
561 					  struct frame_info *frame);
562 
563 extern CORE_ADDR address_from_register (struct type *type, int regnum,
564 					struct frame_info *frame);
565 
566 extern struct value *value_of_variable (struct symbol *var,
567 					const struct block *b);
568 
569 extern struct value *address_of_variable (struct symbol *var,
570 					  const struct block *b);
571 
572 extern struct value *value_of_register (int regnum, struct frame_info *frame);
573 
574 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
575 
576 extern int symbol_read_needs_frame (struct symbol *);
577 
578 extern struct value *read_var_value (struct symbol *var,
579 				     struct frame_info *frame);
580 
581 extern struct value *default_read_var_value (struct symbol *var,
582 					     struct frame_info *frame);
583 
584 extern struct value *allocate_value (struct type *type);
585 extern struct value *allocate_value_lazy (struct type *type);
586 extern void allocate_value_contents (struct value *value);
587 extern void value_contents_copy (struct value *dst, int dst_offset,
588 				 struct value *src, int src_offset,
589 				 int length);
590 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
591 				     struct value *src, int src_offset,
592 				     int length);
593 
594 extern struct value *allocate_repeat_value (struct type *type, int count);
595 
596 extern struct value *value_mark (void);
597 
598 extern void value_free_to_mark (struct value *mark);
599 
600 extern struct value *value_cstring (char *ptr, ssize_t len,
601 				    struct type *char_type);
602 extern struct value *value_string (char *ptr, ssize_t len,
603 				   struct type *char_type);
604 
605 extern struct value *value_array (int lowbound, int highbound,
606 				  struct value **elemvec);
607 
608 extern struct value *value_concat (struct value *arg1, struct value *arg2);
609 
610 extern struct value *value_binop (struct value *arg1, struct value *arg2,
611 				  enum exp_opcode op);
612 
613 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
614 
615 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
616 
617 extern int value_must_coerce_to_target (struct value *arg1);
618 
619 extern struct value *value_coerce_to_target (struct value *arg1);
620 
621 extern struct value *value_coerce_array (struct value *arg1);
622 
623 extern struct value *value_coerce_function (struct value *arg1);
624 
625 extern struct value *value_ind (struct value *arg1);
626 
627 extern struct value *value_addr (struct value *arg1);
628 
629 extern struct value *value_ref (struct value *arg1);
630 
631 extern struct value *value_assign (struct value *toval,
632 				   struct value *fromval);
633 
634 extern struct value *value_pos (struct value *arg1);
635 
636 extern struct value *value_neg (struct value *arg1);
637 
638 extern struct value *value_complement (struct value *arg1);
639 
640 extern struct value *value_struct_elt (struct value **argp,
641 				       struct value **args,
642 				       const char *name, int *static_memfuncp,
643 				       const char *err);
644 
645 extern struct value *value_aggregate_elt (struct type *curtype,
646 					  char *name,
647 					  struct type *expect_type,
648 					  int want_address,
649 					  enum noside noside);
650 
651 extern struct value *value_static_field (struct type *type, int fieldno);
652 
653 enum oload_search_type { NON_METHOD, METHOD, BOTH };
654 
655 extern int find_overload_match (struct value **args, int nargs,
656 				const char *name,
657 				enum oload_search_type method,
658 				struct value **objp, struct symbol *fsym,
659 				struct value **valp, struct symbol **symp,
660 				int *staticp, const int no_adl);
661 
662 extern struct value *value_field (struct value *arg1, int fieldno);
663 
664 extern struct value *value_primitive_field (struct value *arg1, int offset,
665 					    int fieldno,
666 					    struct type *arg_type);
667 
668 
669 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
670 					      int *);
671 
672 extern struct value *value_full_object (struct value *, struct type *, int,
673 					int, int);
674 
675 extern struct value *value_cast_pointers (struct type *, struct value *, int);
676 
677 extern struct value *value_cast (struct type *type, struct value *arg2);
678 
679 extern struct value *value_reinterpret_cast (struct type *type,
680 					     struct value *arg);
681 
682 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
683 
684 extern struct value *value_zero (struct type *type, enum lval_type lv);
685 
686 extern struct value *value_one (struct type *type);
687 
688 extern struct value *value_repeat (struct value *arg1, int count);
689 
690 extern struct value *value_subscript (struct value *array, LONGEST index);
691 
692 extern struct value *value_bitstring_subscript (struct type *type,
693 						struct value *bitstring,
694 						LONGEST index);
695 
696 extern struct value *register_value_being_returned (struct type *valtype,
697 						    struct regcache *retbuf);
698 
699 extern int value_in (struct value *element, struct value *set);
700 
701 extern int value_bit_index (struct type *type, const gdb_byte *addr,
702 			    int index);
703 
704 extern enum return_value_convention
705 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
706 			  struct type *value_type);
707 
708 extern int using_struct_return (struct gdbarch *gdbarch,
709 				struct value *function,
710 				struct type *value_type);
711 
712 extern struct value *evaluate_expression (struct expression *exp);
713 
714 extern struct value *evaluate_type (struct expression *exp);
715 
716 extern struct value *evaluate_subexp (struct type *expect_type,
717 				      struct expression *exp,
718 				      int *pos, enum noside noside);
719 
720 extern struct value *evaluate_subexpression_type (struct expression *exp,
721 						  int subexp);
722 
723 extern void fetch_subexp_value (struct expression *exp, int *pc,
724 				struct value **valp, struct value **resultp,
725 				struct value **val_chain);
726 
727 extern char *extract_field_op (struct expression *exp, int *subexp);
728 
729 extern struct value *evaluate_subexp_with_coercion (struct expression *,
730 						    int *, enum noside);
731 
732 extern struct value *parse_and_eval (const char *exp);
733 
734 extern struct value *parse_to_comma_and_eval (const char **expp);
735 
736 extern struct type *parse_and_eval_type (char *p, int length);
737 
738 extern CORE_ADDR parse_and_eval_address (const char *exp);
739 
740 extern LONGEST parse_and_eval_long (char *exp);
741 
742 extern void unop_promote (const struct language_defn *language,
743 			  struct gdbarch *gdbarch,
744 			  struct value **arg1);
745 
746 extern void binop_promote (const struct language_defn *language,
747 			   struct gdbarch *gdbarch,
748 			   struct value **arg1, struct value **arg2);
749 
750 extern struct value *access_value_history (int num);
751 
752 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
753 					   struct internalvar *var);
754 
755 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
756 
757 extern void set_internalvar (struct internalvar *var, struct value *val);
758 
759 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
760 
761 extern void set_internalvar_string (struct internalvar *var,
762 				    const char *string);
763 
764 extern void clear_internalvar (struct internalvar *var);
765 
766 extern void set_internalvar_component (struct internalvar *var,
767 				       int offset,
768 				       int bitpos, int bitsize,
769 				       struct value *newvalue);
770 
771 extern struct internalvar *lookup_only_internalvar (const char *name);
772 
773 extern struct internalvar *create_internalvar (const char *name);
774 
775 extern VEC (char_ptr) *complete_internalvar (const char *name);
776 
777 /* An internalvar can be dynamically computed by supplying a vector of
778    function pointers to perform various operations.  */
779 
780 struct internalvar_funcs
781 {
782   /* Compute the value of the variable.  The DATA argument passed to
783      the function is the same argument that was passed to
784      `create_internalvar_type_lazy'.  */
785 
786   struct value *(*make_value) (struct gdbarch *arch,
787 			       struct internalvar *var,
788 			       void *data);
789 
790   /* Update the agent expression EXPR with bytecode to compute the
791      value.  VALUE is the agent value we are updating.  The DATA
792      argument passed to this function is the same argument that was
793      passed to `create_internalvar_type_lazy'.  If this pointer is
794      NULL, then the internalvar cannot be compiled to an agent
795      expression.  */
796 
797   void (*compile_to_ax) (struct internalvar *var,
798 			 struct agent_expr *expr,
799 			 struct axs_value *value,
800 			 void *data);
801 
802   /* If non-NULL, this is called to destroy DATA.  The DATA argument
803      passed to this function is the same argument that was passed to
804      `create_internalvar_type_lazy'.  */
805 
806   void (*destroy) (void *data);
807 };
808 
809 extern struct internalvar *
810 create_internalvar_type_lazy (const char *name,
811 			      const struct internalvar_funcs *funcs,
812 			      void *data);
813 
814 /* Compile an internal variable to an agent expression.  VAR is the
815    variable to compile; EXPR and VALUE are the agent expression we are
816    updating.  This will return 0 if there is no known way to compile
817    VAR, and 1 if VAR was successfully compiled.  It may also throw an
818    exception on error.  */
819 
820 extern int compile_internalvar_to_ax (struct internalvar *var,
821 				      struct agent_expr *expr,
822 				      struct axs_value *value);
823 
824 extern struct internalvar *lookup_internalvar (const char *name);
825 
826 extern int value_equal (struct value *arg1, struct value *arg2);
827 
828 extern int value_equal_contents (struct value *arg1, struct value *arg2);
829 
830 extern int value_less (struct value *arg1, struct value *arg2);
831 
832 extern int value_logical_not (struct value *arg1);
833 
834 /* C++ */
835 
836 extern struct value *value_of_this (const struct language_defn *lang);
837 
838 extern struct value *value_of_this_silent (const struct language_defn *lang);
839 
840 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
841 				    enum exp_opcode op,
842 				    enum exp_opcode otherop,
843 				    enum noside noside);
844 
845 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
846 				   enum noside noside);
847 
848 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
849 				     int j, struct type *type, int offset);
850 
851 extern int binop_types_user_defined_p (enum exp_opcode op,
852 				       struct type *type1,
853 				       struct type *type2);
854 
855 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
856 				 struct value *arg2);
857 
858 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
859 
860 extern int destructor_name_p (const char *name, struct type *type);
861 
862 extern void value_incref (struct value *val);
863 
864 extern void value_free (struct value *val);
865 
866 extern void free_all_values (void);
867 
868 extern void free_value_chain (struct value *v);
869 
870 extern void release_value (struct value *val);
871 
872 extern void release_value_or_incref (struct value *val);
873 
874 extern int record_latest_value (struct value *val);
875 
876 extern void modify_field (struct type *type, gdb_byte *addr,
877 			  LONGEST fieldval, int bitpos, int bitsize);
878 
879 extern void type_print (struct type *type, const char *varstring,
880 			struct ui_file *stream, int show);
881 
882 extern char *type_to_string (struct type *type);
883 
884 extern gdb_byte *baseclass_addr (struct type *type, int index,
885 				 gdb_byte *valaddr,
886 				 struct value **valuep, int *errp);
887 
888 extern void print_longest (struct ui_file *stream, int format,
889 			   int use_local, LONGEST val);
890 
891 extern void print_floating (const gdb_byte *valaddr, struct type *type,
892 			    struct ui_file *stream);
893 
894 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
895 				    struct ui_file *stream);
896 
897 extern void value_print (struct value *val, struct ui_file *stream,
898 			 const struct value_print_options *options);
899 
900 extern void value_print_array_elements (struct value *val,
901 					struct ui_file *stream, int format,
902 					enum val_prettyprint pretty);
903 
904 extern struct value *value_release_to_mark (struct value *mark);
905 
906 extern void val_print (struct type *type, const gdb_byte *valaddr,
907 		       int embedded_offset, CORE_ADDR address,
908 		       struct ui_file *stream, int recurse,
909 		       const struct value *val,
910 		       const struct value_print_options *options,
911 		       const struct language_defn *language);
912 
913 extern void common_val_print (struct value *val,
914 			      struct ui_file *stream, int recurse,
915 			      const struct value_print_options *options,
916 			      const struct language_defn *language);
917 
918 extern int val_print_string (struct type *elttype, const char *encoding,
919 			     CORE_ADDR addr, int len,
920 			     struct ui_file *stream,
921 			     const struct value_print_options *options);
922 
923 extern void print_variable_and_value (const char *name,
924 				      struct symbol *var,
925 				      struct frame_info *frame,
926 				      struct ui_file *stream,
927 				      int indent);
928 
929 extern void typedef_print (struct type *type, struct symbol *news,
930 			   struct ui_file *stream);
931 
932 extern char *internalvar_name (struct internalvar *var);
933 
934 extern void preserve_values (struct objfile *);
935 
936 /* From values.c */
937 
938 extern struct value *value_copy (struct value *);
939 
940 extern struct value *value_non_lval (struct value *);
941 
942 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
943 
944 /* From valops.c */
945 
946 extern struct value *varying_to_slice (struct value *);
947 
948 extern struct value *value_slice (struct value *, int, int);
949 
950 extern struct value *value_literal_complex (struct value *, struct value *,
951 					    struct type *);
952 
953 extern struct value *find_function_in_inferior (const char *,
954 						struct objfile **);
955 
956 extern struct value *value_allocate_space_in_inferior (int);
957 
958 extern struct value *value_subscripted_rvalue (struct value *array,
959 					       LONGEST index, int lowerbound);
960 
961 /* User function handler.  */
962 
963 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
964 					       const struct language_defn *language,
965 					       void *cookie,
966 					       int argc,
967 					       struct value **argv);
968 
969 void add_internal_function (const char *name, const char *doc,
970 			    internal_function_fn handler,
971 			    void *cookie);
972 
973 struct value *call_internal_function (struct gdbarch *gdbarch,
974 				      const struct language_defn *language,
975 				      struct value *function,
976 				      int argc, struct value **argv);
977 
978 char *value_internal_function_name (struct value *);
979 
980 #endif /* !defined (VALUE_H) */
981