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 /* Convert a REF to the object referenced.  */
 355
 356 extern struct value *coerce_ref (struct value *value);
 357
 358 /* If ARG is an array, convert it to a pointer.
 359    If ARG is a function, convert it to a function pointer.
 360
 361    References are dereferenced.  */
 362
 363 extern struct value *coerce_array (struct value *value);
 364
 365 /* Given a value, determine whether the bits starting at OFFSET and
 366    extending for LENGTH bits are valid.  This returns nonzero if all
 367    bits in the given range are valid, zero if any bit is invalid.  */
 368
 369 extern int value_bits_valid (const struct value *value,
 370                              int offset, int length);
 371
 372 /* Given a value, determine whether the bits starting at OFFSET and
 373    extending for LENGTH bits are a synthetic pointer.  */
 374
 375 extern int value_bits_synthetic_pointer (const struct value *value,
 376                                          int offset, int length);
 377
 378 /* Given a value, determine whether the contents bytes starting at
 379    OFFSET and extending for LENGTH bytes are available.  This returns
 380    nonzero if all bytes in the given range are available, zero if any
 381    byte is unavailable.  */
 382
 383 extern int value_bytes_available (const struct value *value,
 384                                   int offset, int length);
 385
 386 /* Like value_bytes_available, but return false if any byte in the
 387    whole object is unavailable.  */
 388 extern int value_entirely_available (struct value *value);
 389
 390 /* Mark VALUE's content bytes starting at OFFSET and extending for
 391    LENGTH bytes as unavailable.  */
 392
 393 extern void mark_value_bytes_unavailable (struct value *value,
 394                                           int offset, int length);
 395
 396 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 397    LENGTH bytes of VAL2's contents starting at OFFSET2.
 398
 399    Note that "contents" refers to the whole value's contents
 400    (value_contents_all), without any embedded offset adjustment.  For
 401    example, to compare a complete object value with itself, including
 402    its enclosing type chunk, you'd do:
 403
 404      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 405      value_available_contents (val, 0, val, 0, len);
 406
 407    Returns true iff the set of available contents match.  Unavailable
 408    contents compare equal with unavailable contents, and different
 409    with any available byte.  For example, if 'x's represent an
 410    unavailable byte, and 'V' and 'Z' represent different available
 411    bytes, in a value with length 16:
 412
 413    offset:   0   4   8   12  16
 414    contents: xxxxVVVVxxxxVVZZ
 415
 416    then:
 417
 418    value_available_contents_eq(val, 0, val, 8, 6) => 1
 419    value_available_contents_eq(val, 0, val, 4, 4) => 1
 420    value_available_contents_eq(val, 0, val, 8, 8) => 0
 421    value_available_contents_eq(val, 4, val, 12, 2) => 1
 422    value_available_contents_eq(val, 4, val, 12, 4) => 0
 423    value_available_contents_eq(val, 3, val, 4, 4) => 0
 424 */
 425
 426 extern int value_available_contents_eq (const struct value *val1, int offset1,
 427                                         const struct value *val2, int offset2,
 428                                         int length);
 429
 430 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 431    is (or will be copied to) VAL's contents buffer offset by
 432    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 433    Marks value contents ranges as unavailable if the corresponding
 434    memory is likewise unavailable.  STACK indicates whether the memory
 435    is known to be stack memory.  */
 436
 437 extern void read_value_memory (struct value *val, int embedded_offset,
 438                                int stack, CORE_ADDR memaddr,
 439                                gdb_byte *buffer, size_t length);
 440
 441 \f
 442
 443 #include "symtab.h"
 444 #include "gdbtypes.h"
 445 #include "expression.h"
 446
 447 struct frame_info;
 448 struct fn_field;
 449
 450 extern void print_address_demangle (struct gdbarch *, CORE_ADDR,
 451                                     struct ui_file *, int);
 452
 453 extern LONGEST value_as_long (struct value *val);
 454 extern DOUBLEST value_as_double (struct value *val);
 455 extern CORE_ADDR value_as_address (struct value *val);
 456
 457 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 458 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 459                                int *invp);
 460 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 461
 462 extern int unpack_value_bits_as_long (struct type *field_type,
 463                                       const gdb_byte *valaddr,
 464                                       int embedded_offset, int bitpos,
 465                                       int bitsize,
 466                                       const struct value *original_value,
 467                                       LONGEST *result);
 468
 469 extern LONGEST unpack_field_as_long (struct type *type,
 470                                      const gdb_byte *valaddr,
 471                                      int fieldno);
 472 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 473                                 int embedded_offset, int fieldno,
 474                                 const struct value *val, LONGEST *result);
 475
 476 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 477                                            const gdb_byte *valaddr,
 478                                            int embedded_offset,
 479                                            const struct value *val);
 480
 481 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 482
 483 extern struct value *value_from_longest (struct type *type, LONGEST num);
 484 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 485 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 486 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 487 extern struct value *value_from_decfloat (struct type *type,
 488                                           const gdb_byte *decbytes);
 489 extern struct value *value_from_history_ref (char *, char **);
 490
 491 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 492 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 493
 494 extern struct value *value_from_contents_and_address (struct type *,
 495                                                       const gdb_byte *,
 496                                                       CORE_ADDR);
 497 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 498
 499 extern struct value *default_value_from_register (struct type *type,
 500                                                   int regnum,
 501                                                   struct frame_info *frame);
 502
 503 extern void read_frame_register_value (struct value *value,
 504                                        struct frame_info *frame);
 505
 506 extern struct value *value_from_register (struct type *type, int regnum,
 507                                           struct frame_info *frame);
 508
 509 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 510                                         struct frame_info *frame);
 511
 512 extern struct value *value_of_variable (struct symbol *var,
 513                                         const struct block *b);
 514
 515 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 516
 517 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 518
 519 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 520
 521 extern int symbol_read_needs_frame (struct symbol *);
 522
 523 extern struct value *read_var_value (struct symbol *var,
 524                                      struct frame_info *frame);
 525
 526 extern struct value *allocate_value (struct type *type);
 527 extern struct value *allocate_value_lazy (struct type *type);
 528 extern void allocate_value_contents (struct value *value);
 529 extern void value_contents_copy (struct value *dst, int dst_offset,
 530                                  struct value *src, int src_offset,
 531                                  int length);
 532 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 533                                      struct value *src, int src_offset,
 534                                      int length);
 535
 536 extern struct value *allocate_repeat_value (struct type *type, int count);
 537
 538 extern struct value *value_mark (void);
 539
 540 extern void value_free_to_mark (struct value *mark);
 541
 542 extern struct value *value_cstring (char *ptr, int len,
 543                                     struct type *char_type);
 544 extern struct value *value_string (char *ptr, int len,
 545                                    struct type *char_type);
 546 extern struct value *value_bitstring (char *ptr, int len,
 547                                       struct type *index_type);
 548
 549 extern struct value *value_array (int lowbound, int highbound,
 550                                   struct value **elemvec);
 551
 552 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 553
 554 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 555                                   enum exp_opcode op);
 556
 557 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 558
 559 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 560
 561 extern int value_must_coerce_to_target (struct value *arg1);
 562
 563 extern struct value *value_coerce_to_target (struct value *arg1);
 564
 565 extern struct value *value_coerce_array (struct value *arg1);
 566
 567 extern struct value *value_coerce_function (struct value *arg1);
 568
 569 extern struct value *value_ind (struct value *arg1);
 570
 571 extern struct value *value_addr (struct value *arg1);
 572
 573 extern struct value *value_ref (struct value *arg1);
 574
 575 extern struct value *value_assign (struct value *toval,
 576                                    struct value *fromval);
 577
 578 extern struct value *value_pos (struct value *arg1);
 579
 580 extern struct value *value_neg (struct value *arg1);
 581
 582 extern struct value *value_complement (struct value *arg1);
 583
 584 extern struct value *value_struct_elt (struct value **argp,
 585                                        struct value **args,
 586                                        const char *name, int *static_memfuncp,
 587                                        const char *err);
 588
 589 extern struct value *value_aggregate_elt (struct type *curtype,
 590                                           char *name,
 591                                           struct type *expect_type,
 592                                           int want_address,
 593                                           enum noside noside);
 594
 595 extern struct value *value_static_field (struct type *type, int fieldno);
 596
 597 extern struct fn_field *value_find_oload_method_list (struct value **,
 598                                                       const char *,
 599                                                       int, int *,
 600                                                       struct type **, int *);
 601
 602 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 603
 604 extern int find_overload_match (struct value **args, int nargs,
 605                                 const char *name,
 606                                 enum oload_search_type method, int lax,
 607                                 struct value **objp, struct symbol *fsym,
 608                                 struct value **valp, struct symbol **symp,
 609                                 int *staticp, const int no_adl);
 610
 611 extern struct value *value_field (struct value *arg1, int fieldno);
 612
 613 extern struct value *value_primitive_field (struct value *arg1, int offset,
 614                                             int fieldno,
 615                                             struct type *arg_type);
 616
 617
 618 extern struct type *value_rtti_target_type (struct value *, int *, int *,
 619                                             int *);
 620
 621 extern struct value *value_full_object (struct value *, struct type *, int,
 622                                         int, int);
 623
 624 extern struct value *value_cast_pointers (struct type *, struct value *);
 625
 626 extern struct value *value_cast (struct type *type, struct value *arg2);
 627
 628 extern struct value *value_reinterpret_cast (struct type *type,
 629                                              struct value *arg);
 630
 631 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 632
 633 extern struct value *value_zero (struct type *type, enum lval_type lv);
 634
 635 extern struct value *value_one (struct type *type);
 636
 637 extern struct value *value_repeat (struct value *arg1, int count);
 638
 639 extern struct value *value_subscript (struct value *array, LONGEST index);
 640
 641 extern struct value *value_bitstring_subscript (struct type *type,
 642                                                 struct value *bitstring,
 643                                                 LONGEST index);
 644
 645 extern struct value *register_value_being_returned (struct type *valtype,
 646                                                     struct regcache *retbuf);
 647
 648 extern int value_in (struct value *element, struct value *set);
 649
 650 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 651                             int index);
 652
 653 extern int using_struct_return (struct gdbarch *gdbarch,
 654                                 struct type *func_type,
 655                                 struct type *value_type);
 656
 657 extern struct value *evaluate_expression (struct expression *exp);
 658
 659 extern struct value *evaluate_type (struct expression *exp);
 660
 661 extern struct value *evaluate_subexp (struct type *expect_type,
 662                                       struct expression *exp,
 663                                       int *pos, enum noside noside);
 664
 665 extern struct value *evaluate_subexpression_type (struct expression *exp,
 666                                                   int subexp);
 667
 668 extern void fetch_subexp_value (struct expression *exp, int *pc,
 669                                 struct value **valp, struct value **resultp,
 670                                 struct value **val_chain);
 671
 672 extern char *extract_field_op (struct expression *exp, int *subexp);
 673
 674 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 675                                                     int *, enum noside);
 676
 677 extern struct value *parse_and_eval (char *exp);
 678
 679 extern struct value *parse_to_comma_and_eval (char **expp);
 680
 681 extern struct type *parse_and_eval_type (char *p, int length);
 682
 683 extern CORE_ADDR parse_and_eval_address (char *exp);
 684
 685 extern LONGEST parse_and_eval_long (char *exp);
 686
 687 extern void unop_promote (const struct language_defn *language,
 688                           struct gdbarch *gdbarch,
 689                           struct value **arg1);
 690
 691 extern void binop_promote (const struct language_defn *language,
 692                            struct gdbarch *gdbarch,
 693                            struct value **arg1, struct value **arg2);
 694
 695 extern struct value *access_value_history (int num);
 696
 697 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 698                                            struct internalvar *var);
 699
 700 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 701
 702 extern void set_internalvar (struct internalvar *var, struct value *val);
 703
 704 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 705
 706 extern void set_internalvar_string (struct internalvar *var,
 707                                     const char *string);
 708
 709 extern void clear_internalvar (struct internalvar *var);
 710
 711 extern void set_internalvar_component (struct internalvar *var,
 712                                        int offset,
 713                                        int bitpos, int bitsize,
 714                                        struct value *newvalue);
 715
 716 extern struct internalvar *lookup_only_internalvar (const char *name);
 717
 718 extern struct internalvar *create_internalvar (const char *name);
 719
 720 typedef struct value * (*internalvar_make_value) (struct gdbarch *,
 721                                                   struct internalvar *);
 722 extern struct internalvar *
 723   create_internalvar_type_lazy (char *name, internalvar_make_value fun);
 724
 725 extern struct internalvar *lookup_internalvar (const char *name);
 726
 727 extern int value_equal (struct value *arg1, struct value *arg2);
 728
 729 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 730
 731 extern int value_less (struct value *arg1, struct value *arg2);
 732
 733 extern int value_logical_not (struct value *arg1);
 734
 735 /* C++ */
 736
 737 extern struct value *value_of_this (const struct language_defn *lang);
 738
 739 extern struct value *value_of_this_silent (const struct language_defn *lang);
 740
 741 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 742                                     enum exp_opcode op,
 743                                     enum exp_opcode otherop,
 744                                     enum noside noside);
 745
 746 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 747                                    enum noside noside);
 748
 749 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 750                                      int j, struct type *type, int offset);
 751
 752 extern int binop_types_user_defined_p (enum exp_opcode op,
 753                                        struct type *type1,
 754                                        struct type *type2);
 755
 756 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 757                                  struct value *arg2);
 758
 759 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 760
 761 extern int destructor_name_p (const char *name, struct type *type);
 762
 763 extern void value_incref (struct value *val);
 764
 765 extern void value_free (struct value *val);
 766
 767 extern void free_all_values (void);
 768
 769 extern void free_value_chain (struct value *v);
 770
 771 extern void release_value (struct value *val);
 772
 773 extern void release_value_or_incref (struct value *val);
 774
 775 extern int record_latest_value (struct value *val);
 776
 777 extern void modify_field (struct type *type, gdb_byte *addr,
 778                           LONGEST fieldval, int bitpos, int bitsize);
 779
 780 extern void type_print (struct type *type, char *varstring,
 781                         struct ui_file *stream, int show);
 782
 783 extern char *type_to_string (struct type *type);
 784
 785 extern gdb_byte *baseclass_addr (struct type *type, int index,
 786                                  gdb_byte *valaddr,
 787                                  struct value **valuep, int *errp);
 788
 789 extern void print_longest (struct ui_file *stream, int format,
 790                            int use_local, LONGEST val);
 791
 792 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 793                             struct ui_file *stream);
 794
 795 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 796                                     struct ui_file *stream);
 797
 798 extern int value_print (struct value *val, struct ui_file *stream,
 799                         const struct value_print_options *options);
 800
 801 extern void value_print_array_elements (struct value *val,
 802                                         struct ui_file *stream, int format,
 803                                         enum val_prettyprint pretty);
 804
 805 extern struct value *value_release_to_mark (struct value *mark);
 806
 807 extern int val_print (struct type *type, const gdb_byte *valaddr,
 808                       int embedded_offset, CORE_ADDR address,
 809                       struct ui_file *stream, int recurse,
 810                       const struct value *val,
 811                       const struct value_print_options *options,
 812                       const struct language_defn *language);
 813
 814 extern int common_val_print (struct value *val,
 815                              struct ui_file *stream, int recurse,
 816                              const struct value_print_options *options,
 817                              const struct language_defn *language);
 818
 819 extern int val_print_string (struct type *elttype, const char *encoding,
 820                              CORE_ADDR addr, int len,
 821                              struct ui_file *stream,
 822                              const struct value_print_options *options);
 823
 824 extern void print_variable_and_value (const char *name,
 825                                       struct symbol *var,
 826                                       struct frame_info *frame,
 827                                       struct ui_file *stream,
 828                                       int indent);
 829
 830 extern int check_field (struct type *, const char *);
 831
 832 extern void typedef_print (struct type *type, struct symbol *news,
 833                            struct ui_file *stream);
 834
 835 extern char *internalvar_name (struct internalvar *var);
 836
 837 extern void preserve_values (struct objfile *);
 838
 839 /* From values.c */
 840
 841 extern struct value *value_copy (struct value *);
 842
 843 extern struct value *value_non_lval (struct value *);
 844
 845 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 846
 847 /* From valops.c */
 848
 849 extern struct value *varying_to_slice (struct value *);
 850
 851 extern struct value *value_slice (struct value *, int, int);
 852
 853 extern struct value *value_literal_complex (struct value *, struct value *,
 854                                             struct type *);
 855
 856 extern struct value *find_function_in_inferior (const char *,
 857                                                 struct objfile **);
 858
 859 extern struct value *value_allocate_space_in_inferior (int);
 860
 861 extern struct value *value_subscripted_rvalue (struct value *array,
 862                                                LONGEST index, int lowerbound);
 863
 864 /* User function handler.  */
 865
 866 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 867                                                const struct language_defn *language,
 868                                                void *cookie,
 869                                                int argc,
 870                                                struct value **argv);
 871
 872 void add_internal_function (const char *name, const char *doc,
 873                             internal_function_fn handler,
 874                             void *cookie);
 875
 876 struct value *call_internal_function (struct gdbarch *gdbarch,
 877                                       const struct language_defn *language,
 878                                       struct value *function,
 879                                       int argc, struct value **argv);
 880
 881 char *value_internal_function_name (struct value *);
 882
 883 #endif /* !defined (VALUE_H) */