gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986-2012 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 extern void deprecated_set_value_modifiable (struct value *value,
  94                                              int modifiable);
  95
  96 /* If a value represents a C++ object, then the `type' field gives the
  97    object's compile-time type.  If the object actually belongs to some
  98    class derived from `type', perhaps with other base classes and
  99    additional members, then `type' is just a subobject of the real
 100    thing, and the full object is probably larger than `type' would
 101    suggest.
 102
 103    If `type' is a dynamic class (i.e. one with a vtable), then GDB can
 104    actually determine the object's run-time type by looking at the
 105    run-time type information in the vtable.  When this information is
 106    available, we may elect to read in the entire object, for several
 107    reasons:
 108
 109    - When printing the value, the user would probably rather see the
 110      full object, not just the limited portion apparent from the
 111      compile-time type.
 112
 113    - If `type' has virtual base classes, then even printing `type'
 114      alone may require reaching outside the `type' portion of the
 115      object to wherever the virtual base class has been stored.
 116
 117    When we store the entire object, `enclosing_type' is the run-time
 118    type -- the complete object -- and `embedded_offset' is the offset
 119    of `type' within that larger type, in bytes.  The value_contents()
 120    macro takes `embedded_offset' into account, so most GDB code
 121    continues to see the `type' portion of the value, just as the
 122    inferior would.
 123
 124    If `type' is a pointer to an object, then `enclosing_type' is a
 125    pointer to the object's run-time type, and `pointed_to_offset' is
 126    the offset in bytes from the full object to the pointed-to object
 127    -- that is, the value `embedded_offset' would have if we followed
 128    the pointer and fetched the complete object.  (I don't really see
 129    the point.  Why not just determine the run-time type when you
 130    indirect, and avoid the special case?  The contents don't matter
 131    until you indirect anyway.)
 132
 133    If we're not doing anything fancy, `enclosing_type' is equal to
 134    `type', and `embedded_offset' is zero, so everything works
 135    normally.  */
 136
 137 extern struct type *value_enclosing_type (struct value *);
 138 extern void set_value_enclosing_type (struct value *val,
 139                                       struct type *new_type);
 140
 141 extern int value_pointed_to_offset (struct value *value);
 142 extern void set_value_pointed_to_offset (struct value *value, int val);
 143 extern int value_embedded_offset (struct value *value);
 144 extern void set_value_embedded_offset (struct value *value, int val);
 145
 146 /* For lval_computed values, this structure holds functions used to
 147    retrieve and set the value (or portions of the value).
 148
 149    For each function, 'V' is the 'this' pointer: an lval_funcs
 150    function F may always assume that the V it receives is an
 151    lval_computed value, and has F in the appropriate slot of its
 152    lval_funcs structure.  */
 153
 154 struct lval_funcs
 155 {
 156   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
 157      a problem arises in obtaining VALUE's bits, this function should
 158      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
 159      non-optimized-out value is an internal error.  */
 160   void (*read) (struct value *v);
 161
 162   /* Handle an assignment TOVAL = FROMVAL by writing the value of
 163      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
 164      been updated.  If a problem arises in doing so, this function
 165      should call 'error'.  If it is NULL such TOVAL assignment is an error as
 166      TOVAL is not considered as an lvalue.  */
 167   void (*write) (struct value *toval, struct value *fromval);
 168
 169   /* Check the validity of some bits in VALUE.  This should return 1
 170      if all the bits starting at OFFSET and extending for LENGTH bits
 171      are valid, or 0 if any bit is invalid.  */
 172   int (*check_validity) (const struct value *value, int offset, int length);
 173
 174   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 175   int (*check_any_valid) (const struct value *value);
 176
 177   /* If non-NULL, this is used to implement pointer indirection for
 178      this value.  This method may return NULL, in which case value_ind
 179      will fall back to ordinary indirection.  */
 180   struct value *(*indirect) (struct value *value);
 181
 182   /* If non-NULL, this is used to implement reference resolving for
 183      this value.  This method may return NULL, in which case coerce_ref
 184      will fall back to ordinary references resolving.  */
 185   struct value *(*coerce_ref) (const struct value *value);
 186
 187   /* If non-NULL, this is used to determine whether the indicated bits
 188      of VALUE are a synthetic pointer.  */
 189   int (*check_synthetic_pointer) (const struct value *value,
 190                                   int offset, int length);
 191
 192   /* Return a duplicate of VALUE's closure, for use in a new value.
 193      This may simply return the same closure, if VALUE's is
 194      reference-counted or statically allocated.
 195
 196      This may be NULL, in which case VALUE's closure is re-used in the
 197      new value.  */
 198   void *(*copy_closure) (const struct value *v);
 199
 200   /* Drop VALUE's reference to its closure.  Maybe this frees the
 201      closure; maybe this decrements a reference count; maybe the
 202      closure is statically allocated and this does nothing.
 203
 204      This may be NULL, in which case no action is taken to free
 205      VALUE's closure.  */
 206   void (*free_closure) (struct value *v);
 207 };
 208
 209 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 210    and closure CLOSURE.  */
 211
 212 extern struct value *allocate_computed_value (struct type *type,
 213                                               const struct lval_funcs *funcs,
 214                                               void *closure);
 215
 216 extern struct value *allocate_optimized_out_value (struct type *type);
 217
 218 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 219
 220 extern const struct lval_funcs *value_computed_funcs (const struct value *);
 221
 222 /* If VALUE is lval_computed, return its closure.  The meaning of the
 223    returned value depends on the functions VALUE uses.  */
 224
 225 extern void *value_computed_closure (const struct value *value);
 226
 227 /* If zero, contents of this value are in the contents field.  If
 228    nonzero, contents are in inferior.  If the lval field is lval_memory,
 229    the contents are in inferior memory at location.address plus offset.
 230    The lval field may also be lval_register.
 231
 232    WARNING: This field is used by the code which handles watchpoints
 233    (see breakpoint.c) to decide whether a particular value can be
 234    watched by hardware watchpoints.  If the lazy flag is set for some
 235    member of a value chain, it is assumed that this member of the
 236    chain doesn't need to be watched as part of watching the value
 237    itself.  This is how GDB avoids watching the entire struct or array
 238    when the user wants to watch a single struct member or array
 239    element.  If you ever change the way lazy flag is set and reset, be
 240    sure to consider this use as well!  */
 241
 242 extern int value_lazy (struct value *);
 243 extern void set_value_lazy (struct value *value, int val);
 244
 245 extern int value_stack (struct value *);
 246 extern void set_value_stack (struct value *value, int val);
 247
 248 /* value_contents() and value_contents_raw() both return the address
 249    of the gdb buffer used to hold a copy of the contents of the lval.
 250    value_contents() is used when the contents of the buffer are needed
 251    -- it uses value_fetch_lazy() to load the buffer from the process
 252    being debugged if it hasn't already been loaded
 253    (value_contents_writeable() is used when a writeable but fetched
 254    buffer is required)..  value_contents_raw() is used when data is
 255    being stored into the buffer, or when it is certain that the
 256    contents of the buffer are valid.
 257
 258    Note: The contents pointer is adjusted by the offset required to
 259    get to the real subobject, if the value happens to represent
 260    something embedded in a larger run-time object.  */
 261
 262 extern gdb_byte *value_contents_raw (struct value *);
 263
 264 /* Actual contents of the value.  For use of this value; setting it
 265    uses the stuff above.  Not valid if lazy is nonzero.  Target
 266    byte-order.  We force it to be aligned properly for any possible
 267    value.  Note that a value therefore extends beyond what is
 268    declared here.  */
 269
 270 extern const gdb_byte *value_contents (struct value *);
 271 extern gdb_byte *value_contents_writeable (struct value *);
 272
 273 /* The ALL variants of the above two macros do not adjust the returned
 274    pointer by the embedded_offset value.  */
 275
 276 extern gdb_byte *value_contents_all_raw (struct value *);
 277 extern const gdb_byte *value_contents_all (struct value *);
 278
 279 /* Like value_contents_all, but does not require that the returned
 280    bits be valid.  This should only be used in situations where you
 281    plan to check the validity manually.  */
 282 extern const gdb_byte *value_contents_for_printing (struct value *value);
 283
 284 /* Like value_contents_for_printing, but accepts a constant value
 285    pointer.  Unlike value_contents_for_printing however, the pointed
 286    value must _not_ be lazy.  */
 287 extern const gdb_byte *
 288   value_contents_for_printing_const (const struct value *value);
 289
 290 extern int value_fetch_lazy (struct value *val);
 291 extern int value_contents_equal (struct value *val1, struct value *val2);
 292
 293 /* If nonzero, this is the value of a variable which does not actually
 294    exist in the program.  */
 295 extern int value_optimized_out (struct value *value);
 296 extern void set_value_optimized_out (struct value *value, int val);
 297
 298 /* Like value_optimized_out, but return false if any bit in the object
 299    is valid.  */
 300 extern int value_entirely_optimized_out (const struct value *value);
 301
 302 /* Set or return field indicating whether a variable is initialized or
 303    not, based on debugging information supplied by the compiler.
 304    1 = initialized; 0 = uninitialized.  */
 305 extern int value_initialized (struct value *);
 306 extern void set_value_initialized (struct value *, int);
 307
 308 /* Set COMPONENT's location as appropriate for a component of WHOLE
 309    --- regardless of what kind of lvalue WHOLE is.  */
 310 extern void set_value_component_location (struct value *component,
 311                                           const struct value *whole);
 312
 313 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 314    single value might have multiple LVALs), this hacked interface is
 315    limited to just the first PIECE.  Expect further change.  */
 316 /* Type of value; either not an lval, or one of the various different
 317    possible kinds of lval.  */
 318 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 319 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 320
 321 /* Like VALUE_LVAL, except the parameter can be const.  */
 322 extern enum lval_type value_lval_const (const struct value *value);
 323
 324 /* If lval == lval_memory, return the address in the inferior.  If
 325    lval == lval_register, return the byte offset into the registers
 326    structure.  Otherwise, return 0.  The returned address
 327    includes the offset, if any.  */
 328 extern CORE_ADDR value_address (const struct value *);
 329
 330 /* Like value_address, except the result does not include value's
 331    offset.  */
 332 extern CORE_ADDR value_raw_address (struct value *);
 333
 334 /* Set the address of a value.  */
 335 extern void set_value_address (struct value *, CORE_ADDR);
 336
 337 /* Pointer to internal variable.  */
 338 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 339 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 340
 341 /* Frame register value is relative to.  This will be described in the
 342    lval enum above as "lval_register".  */
 343 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 344 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 345
 346 /* Register number if the value is from a register.  */
 347 extern short *deprecated_value_regnum_hack (struct value *);
 348 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 349
 350 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
 351    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
 352
 353 extern struct value *coerce_ref_if_computed (const struct value *arg);
 354
 355 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
 356    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
 357    ORIGINAL_VAL are the type and value of the original reference or pointer.
 358
 359    Note, that VALUE is modified by this function.
 360
 361    It is a common implementation for coerce_ref and value_ind.  */
 362
 363 extern struct value * readjust_indirect_value_type (struct value *value,
 364                                                     struct type *enc_type,
 365                                                     struct type *original_type,
 366                                                     struct value *original_val);
 367
 368 /* Convert a REF to the object referenced.  */
 369
 370 extern struct value *coerce_ref (struct value *value);
 371
 372 /* If ARG is an array, convert it to a pointer.
 373    If ARG is a function, convert it to a function pointer.
 374
 375    References are dereferenced.  */
 376
 377 extern struct value *coerce_array (struct value *value);
 378
 379 /* Given a value, determine whether the bits starting at OFFSET and
 380    extending for LENGTH bits are valid.  This returns nonzero if all
 381    bits in the given range are valid, zero if any bit is invalid.  */
 382
 383 extern int value_bits_valid (const struct value *value,
 384                              int offset, int length);
 385
 386 /* Given a value, determine whether the bits starting at OFFSET and
 387    extending for LENGTH bits are a synthetic pointer.  */
 388
 389 extern int value_bits_synthetic_pointer (const struct value *value,
 390                                          int offset, int length);
 391
 392 /* Given a value, determine whether the contents bytes starting at
 393    OFFSET and extending for LENGTH bytes are available.  This returns
 394    nonzero if all bytes in the given range are available, zero if any
 395    byte is unavailable.  */
 396
 397 extern int value_bytes_available (const struct value *value,
 398                                   int offset, int length);
 399
 400 /* Like value_bytes_available, but return false if any byte in the
 401    whole object is unavailable.  */
 402 extern int value_entirely_available (struct value *value);
 403
 404 /* Mark VALUE's content bytes starting at OFFSET and extending for
 405    LENGTH bytes as unavailable.  */
 406
 407 extern void mark_value_bytes_unavailable (struct value *value,
 408                                           int offset, int length);
 409
 410 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 411    LENGTH bytes of VAL2's contents starting at OFFSET2.
 412
 413    Note that "contents" refers to the whole value's contents
 414    (value_contents_all), without any embedded offset adjustment.  For
 415    example, to compare a complete object value with itself, including
 416    its enclosing type chunk, you'd do:
 417
 418      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 419      value_available_contents (val, 0, val, 0, len);
 420
 421    Returns true iff the set of available contents match.  Unavailable
 422    contents compare equal with unavailable contents, and different
 423    with any available byte.  For example, if 'x's represent an
 424    unavailable byte, and 'V' and 'Z' represent different available
 425    bytes, in a value with length 16:
 426
 427    offset:   0   4   8   12  16
 428    contents: xxxxVVVVxxxxVVZZ
 429
 430    then:
 431
 432    value_available_contents_eq(val, 0, val, 8, 6) => 1
 433    value_available_contents_eq(val, 0, val, 4, 4) => 1
 434    value_available_contents_eq(val, 0, val, 8, 8) => 0
 435    value_available_contents_eq(val, 4, val, 12, 2) => 1
 436    value_available_contents_eq(val, 4, val, 12, 4) => 0
 437    value_available_contents_eq(val, 3, val, 4, 4) => 0
 438 */
 439
 440 extern int value_available_contents_eq (const struct value *val1, int offset1,
 441                                         const struct value *val2, int offset2,
 442                                         int length);
 443
 444 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 445    is (or will be copied to) VAL's contents buffer offset by
 446    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 447    Marks value contents ranges as unavailable if the corresponding
 448    memory is likewise unavailable.  STACK indicates whether the memory
 449    is known to be stack memory.  */
 450
 451 extern void read_value_memory (struct value *val, int embedded_offset,
 452                                int stack, CORE_ADDR memaddr,
 453                                gdb_byte *buffer, size_t length);
 454
 455 \f
 456
 457 #include "symtab.h"
 458 #include "gdbtypes.h"
 459 #include "expression.h"
 460
 461 struct frame_info;
 462 struct fn_field;
 463
 464 extern void print_address_demangle (struct gdbarch *, CORE_ADDR,
 465                                     struct ui_file *, int);
 466
 467 extern LONGEST value_as_long (struct value *val);
 468 extern DOUBLEST value_as_double (struct value *val);
 469 extern CORE_ADDR value_as_address (struct value *val);
 470
 471 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 472 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 473                                int *invp);
 474 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 475
 476 extern int unpack_value_bits_as_long (struct type *field_type,
 477                                       const gdb_byte *valaddr,
 478                                       int embedded_offset, int bitpos,
 479                                       int bitsize,
 480                                       const struct value *original_value,
 481                                       LONGEST *result);
 482
 483 extern LONGEST unpack_field_as_long (struct type *type,
 484                                      const gdb_byte *valaddr,
 485                                      int fieldno);
 486 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 487                                 int embedded_offset, int fieldno,
 488                                 const struct value *val, LONGEST *result);
 489
 490 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 491                                            const gdb_byte *valaddr,
 492                                            int embedded_offset,
 493                                            const struct value *val);
 494
 495 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 496
 497 extern struct value *value_from_longest (struct type *type, LONGEST num);
 498 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 499 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 500 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 501 extern struct value *value_from_decfloat (struct type *type,
 502                                           const gdb_byte *decbytes);
 503 extern struct value *value_from_history_ref (char *, char **);
 504
 505 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 506 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 507
 508 extern struct value *value_from_contents_and_address (struct type *,
 509                                                       const gdb_byte *,
 510                                                       CORE_ADDR);
 511 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 512
 513 extern struct value *default_value_from_register (struct type *type,
 514                                                   int regnum,
 515                                                   struct frame_info *frame);
 516
 517 extern void read_frame_register_value (struct value *value,
 518                                        struct frame_info *frame);
 519
 520 extern struct value *value_from_register (struct type *type, int regnum,
 521                                           struct frame_info *frame);
 522
 523 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 524                                         struct frame_info *frame);
 525
 526 extern struct value *value_of_variable (struct symbol *var,
 527                                         const struct block *b);
 528
 529 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 530
 531 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 532
 533 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 534
 535 extern int symbol_read_needs_frame (struct symbol *);
 536
 537 extern struct value *read_var_value (struct symbol *var,
 538                                      struct frame_info *frame);
 539
 540 extern struct value *default_read_var_value (struct symbol *var,
 541                                              struct frame_info *frame);
 542
 543 extern struct value *allocate_value (struct type *type);
 544 extern struct value *allocate_value_lazy (struct type *type);
 545 extern void allocate_value_contents (struct value *value);
 546 extern void value_contents_copy (struct value *dst, int dst_offset,
 547                                  struct value *src, int src_offset,
 548                                  int length);
 549 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 550                                      struct value *src, int src_offset,
 551                                      int length);
 552
 553 extern struct value *allocate_repeat_value (struct type *type, int count);
 554
 555 extern struct value *value_mark (void);
 556
 557 extern void value_free_to_mark (struct value *mark);
 558
 559 extern struct value *value_cstring (char *ptr, int len,
 560                                     struct type *char_type);
 561 extern struct value *value_string (char *ptr, int len,
 562                                    struct type *char_type);
 563 extern struct value *value_bitstring (char *ptr, int len,
 564                                       struct type *index_type);
 565
 566 extern struct value *value_array (int lowbound, int highbound,
 567                                   struct value **elemvec);
 568
 569 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 570
 571 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 572                                   enum exp_opcode op);
 573
 574 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 575
 576 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 577
 578 extern int value_must_coerce_to_target (struct value *arg1);
 579
 580 extern struct value *value_coerce_to_target (struct value *arg1);
 581
 582 extern struct value *value_coerce_array (struct value *arg1);
 583
 584 extern struct value *value_coerce_function (struct value *arg1);
 585
 586 extern struct value *value_ind (struct value *arg1);
 587
 588 extern struct value *value_addr (struct value *arg1);
 589
 590 extern struct value *value_ref (struct value *arg1);
 591
 592 extern struct value *value_assign (struct value *toval,
 593                                    struct value *fromval);
 594
 595 extern struct value *value_pos (struct value *arg1);
 596
 597 extern struct value *value_neg (struct value *arg1);
 598
 599 extern struct value *value_complement (struct value *arg1);
 600
 601 extern struct value *value_struct_elt (struct value **argp,
 602                                        struct value **args,
 603                                        const char *name, int *static_memfuncp,
 604                                        const char *err);
 605
 606 extern struct value *value_aggregate_elt (struct type *curtype,
 607                                           char *name,
 608                                           struct type *expect_type,
 609                                           int want_address,
 610                                           enum noside noside);
 611
 612 extern struct value *value_static_field (struct type *type, int fieldno);
 613
 614 extern struct fn_field *value_find_oload_method_list (struct value **,
 615                                                       const char *,
 616                                                       int, int *,
 617                                                       struct type **, int *);
 618
 619 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 620
 621 extern int find_overload_match (struct value **args, int nargs,
 622                                 const char *name,
 623                                 enum oload_search_type method, int lax,
 624                                 struct value **objp, struct symbol *fsym,
 625                                 struct value **valp, struct symbol **symp,
 626                                 int *staticp, const int no_adl);
 627
 628 extern struct value *value_field (struct value *arg1, int fieldno);
 629
 630 extern struct value *value_primitive_field (struct value *arg1, int offset,
 631                                             int fieldno,
 632                                             struct type *arg_type);
 633
 634
 635 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 636                                               int *);
 637
 638 extern struct value *value_full_object (struct value *, struct type *, int,
 639                                         int, int);
 640
 641 extern struct value *value_cast_pointers (struct type *, struct value *);
 642
 643 extern struct value *value_cast (struct type *type, struct value *arg2);
 644
 645 extern struct value *value_reinterpret_cast (struct type *type,
 646                                              struct value *arg);
 647
 648 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 649
 650 extern struct value *value_zero (struct type *type, enum lval_type lv);
 651
 652 extern struct value *value_one (struct type *type);
 653
 654 extern struct value *value_repeat (struct value *arg1, int count);
 655
 656 extern struct value *value_subscript (struct value *array, LONGEST index);
 657
 658 extern struct value *value_bitstring_subscript (struct type *type,
 659                                                 struct value *bitstring,
 660                                                 LONGEST index);
 661
 662 extern struct value *register_value_being_returned (struct type *valtype,
 663                                                     struct regcache *retbuf);
 664
 665 extern int value_in (struct value *element, struct value *set);
 666
 667 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 668                             int index);
 669
 670 extern int using_struct_return (struct gdbarch *gdbarch,
 671                                 struct type *func_type,
 672                                 struct type *value_type);
 673
 674 extern struct value *evaluate_expression (struct expression *exp);
 675
 676 extern struct value *evaluate_type (struct expression *exp);
 677
 678 extern struct value *evaluate_subexp (struct type *expect_type,
 679                                       struct expression *exp,
 680                                       int *pos, enum noside noside);
 681
 682 extern struct value *evaluate_subexpression_type (struct expression *exp,
 683                                                   int subexp);
 684
 685 extern void fetch_subexp_value (struct expression *exp, int *pc,
 686                                 struct value **valp, struct value **resultp,
 687                                 struct value **val_chain);
 688
 689 extern char *extract_field_op (struct expression *exp, int *subexp);
 690
 691 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 692                                                     int *, enum noside);
 693
 694 extern struct value *parse_and_eval (char *exp);
 695
 696 extern struct value *parse_to_comma_and_eval (char **expp);
 697
 698 extern struct type *parse_and_eval_type (char *p, int length);
 699
 700 extern CORE_ADDR parse_and_eval_address (char *exp);
 701
 702 extern LONGEST parse_and_eval_long (char *exp);
 703
 704 extern void unop_promote (const struct language_defn *language,
 705                           struct gdbarch *gdbarch,
 706                           struct value **arg1);
 707
 708 extern void binop_promote (const struct language_defn *language,
 709                            struct gdbarch *gdbarch,
 710                            struct value **arg1, struct value **arg2);
 711
 712 extern struct value *access_value_history (int num);
 713
 714 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 715                                            struct internalvar *var);
 716
 717 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 718
 719 extern void set_internalvar (struct internalvar *var, struct value *val);
 720
 721 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 722
 723 extern void set_internalvar_string (struct internalvar *var,
 724                                     const char *string);
 725
 726 extern void clear_internalvar (struct internalvar *var);
 727
 728 extern void set_internalvar_component (struct internalvar *var,
 729                                        int offset,
 730                                        int bitpos, int bitsize,
 731                                        struct value *newvalue);
 732
 733 extern struct internalvar *lookup_only_internalvar (const char *name);
 734
 735 extern struct internalvar *create_internalvar (const char *name);
 736
 737 typedef struct value * (*internalvar_make_value) (struct gdbarch *,
 738                                                   struct internalvar *);
 739 extern struct internalvar *
 740   create_internalvar_type_lazy (char *name, internalvar_make_value fun);
 741
 742 extern struct internalvar *lookup_internalvar (const char *name);
 743
 744 extern int value_equal (struct value *arg1, struct value *arg2);
 745
 746 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 747
 748 extern int value_less (struct value *arg1, struct value *arg2);
 749
 750 extern int value_logical_not (struct value *arg1);
 751
 752 /* C++ */
 753
 754 extern struct value *value_of_this (const struct language_defn *lang);
 755
 756 extern struct value *value_of_this_silent (const struct language_defn *lang);
 757
 758 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 759                                     enum exp_opcode op,
 760                                     enum exp_opcode otherop,
 761                                     enum noside noside);
 762
 763 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 764                                    enum noside noside);
 765
 766 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 767                                      int j, struct type *type, int offset);
 768
 769 extern int binop_types_user_defined_p (enum exp_opcode op,
 770                                        struct type *type1,
 771                                        struct type *type2);
 772
 773 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 774                                  struct value *arg2);
 775
 776 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 777
 778 extern int destructor_name_p (const char *name, struct type *type);
 779
 780 extern void value_incref (struct value *val);
 781
 782 extern void value_free (struct value *val);
 783
 784 extern void free_all_values (void);
 785
 786 extern void free_value_chain (struct value *v);
 787
 788 extern void release_value (struct value *val);
 789
 790 extern void release_value_or_incref (struct value *val);
 791
 792 extern int record_latest_value (struct value *val);
 793
 794 extern void modify_field (struct type *type, gdb_byte *addr,
 795                           LONGEST fieldval, int bitpos, int bitsize);
 796
 797 extern void type_print (struct type *type, const char *varstring,
 798                         struct ui_file *stream, int show);
 799
 800 extern char *type_to_string (struct type *type);
 801
 802 extern gdb_byte *baseclass_addr (struct type *type, int index,
 803                                  gdb_byte *valaddr,
 804                                  struct value **valuep, int *errp);
 805
 806 extern void print_longest (struct ui_file *stream, int format,
 807                            int use_local, LONGEST val);
 808
 809 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 810                             struct ui_file *stream);
 811
 812 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 813                                     struct ui_file *stream);
 814
 815 extern void value_print (struct value *val, struct ui_file *stream,
 816                          const struct value_print_options *options);
 817
 818 extern void value_print_array_elements (struct value *val,
 819                                         struct ui_file *stream, int format,
 820                                         enum val_prettyprint pretty);
 821
 822 extern struct value *value_release_to_mark (struct value *mark);
 823
 824 extern void val_print (struct type *type, const gdb_byte *valaddr,
 825                        int embedded_offset, CORE_ADDR address,
 826                        struct ui_file *stream, int recurse,
 827                        const struct value *val,
 828                        const struct value_print_options *options,
 829                        const struct language_defn *language);
 830
 831 extern void common_val_print (struct value *val,
 832                               struct ui_file *stream, int recurse,
 833                               const struct value_print_options *options,
 834                               const struct language_defn *language);
 835
 836 extern int val_print_string (struct type *elttype, const char *encoding,
 837                              CORE_ADDR addr, int len,
 838                              struct ui_file *stream,
 839                              const struct value_print_options *options);
 840
 841 extern void print_variable_and_value (const char *name,
 842                                       struct symbol *var,
 843                                       struct frame_info *frame,
 844                                       struct ui_file *stream,
 845                                       int indent);
 846
 847 extern int check_field (struct type *, const char *);
 848
 849 extern void typedef_print (struct type *type, struct symbol *news,
 850                            struct ui_file *stream);
 851
 852 extern char *internalvar_name (struct internalvar *var);
 853
 854 extern void preserve_values (struct objfile *);
 855
 856 /* From values.c */
 857
 858 extern struct value *value_copy (struct value *);
 859
 860 extern struct value *value_non_lval (struct value *);
 861
 862 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 863
 864 /* From valops.c */
 865
 866 extern struct value *varying_to_slice (struct value *);
 867
 868 extern struct value *value_slice (struct value *, int, int);
 869
 870 extern struct value *value_literal_complex (struct value *, struct value *,
 871                                             struct type *);
 872
 873 extern struct value *find_function_in_inferior (const char *,
 874                                                 struct objfile **);
 875
 876 extern struct value *value_allocate_space_in_inferior (int);
 877
 878 extern struct value *value_subscripted_rvalue (struct value *array,
 879                                                LONGEST index, int lowerbound);
 880
 881 /* User function handler.  */
 882
 883 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 884                                                const struct language_defn *language,
 885                                                void *cookie,
 886                                                int argc,
 887                                                struct value **argv);
 888
 889 void add_internal_function (const char *name, const char *doc,
 890                             internal_function_fn handler,
 891                             void *cookie);
 892
 893 struct value *call_internal_function (struct gdbarch *gdbarch,
 894                                       const struct language_defn *language,
 895                                       struct value *function,
 896                                       int argc, struct value **argv);
 897
 898 char *value_internal_function_name (struct value *);
 899
 900 #endif /* !defined (VALUE_H) */