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