gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   4    1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   5    2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #if !defined (VALUE_H)
  23 #define VALUE_H 1
  24
  25 #include "doublest.h"
  26 #include "frame.h"              /* For struct frame_id.  */
  27
  28 struct block;
  29 struct expression;
  30 struct regcache;
  31 struct symbol;
  32 struct type;
  33 struct ui_file;
  34 struct language_defn;
  35 struct value_print_options;
  36
  37 /* The structure which defines the type of a value.  It should never
  38    be possible for a program lval value to survive over a call to the
  39    inferior (i.e. to be put into the history list or an internal
  40    variable).  */
  41
  42 struct value;
  43
  44 /* Values are stored in a chain, so that they can be deleted easily
  45    over calls to the inferior.  Values assigned to internal variables,
  46    put into the value history or exposed to Python are taken off this
  47    list.  */
  48
  49 struct value *value_next (struct value *);
  50
  51 /* Type of the value.  */
  52
  53 extern struct type *value_type (const struct value *);
  54
  55 /* This is being used to change the type of an existing value, that
  56    code should instead be creating a new value with the changed type
  57    (but possibly shared content).  */
  58
  59 extern void deprecated_set_value_type (struct value *value,
  60                                        struct type *type);
  61
  62 /* Only used for bitfields; number of bits contained in them.  */
  63
  64 extern int value_bitsize (const struct value *);
  65 extern void set_value_bitsize (struct value *, int bit);
  66
  67 /* Only used for bitfields; position of start of field.  For
  68    gdbarch_bits_big_endian=0 targets, it is the position of the LSB.  For
  69    gdbarch_bits_big_endian=1 targets, it is the position of the MSB.  */
  70
  71 extern int value_bitpos (const struct value *);
  72 extern void set_value_bitpos (struct value *, int bit);
  73
  74 /* Only used for bitfields; the containing value.  This allows a
  75    single read from the target when displaying multiple
  76    bitfields.  */
  77
  78 struct value *value_parent (struct value *);
  79
  80 /* Describes offset of a value within lval of a structure in bytes.
  81    If lval == lval_memory, this is an offset to the address.  If lval
  82    == lval_register, this is a further offset from location.address
  83    within the registers structure.  Note also the member
  84    embedded_offset below.  */
  85
  86 extern int value_offset (const struct value *);
  87 extern void set_value_offset (struct value *, int offset);
  88
  89 /* The comment from "struct value" reads: ``Is it modifiable?  Only
  90    relevant if lval != not_lval.''.  Shouldn't the value instead be
  91    not_lval and be done with it?  */
  92
  93 extern int deprecated_value_modifiable (struct value *value);
  94 extern void deprecated_set_value_modifiable (struct value *value,
  95                                              int modifiable);
  96
  97 /* If a value represents a C++ object, then the `type' field gives the
  98    object's compile-time type.  If the object actually belongs to some
  99    class derived from `type', perhaps with other base classes and
 100    additional members, then `type' is just a subobject of the real
 101    thing, and the full object is probably larger than `type' would
 102    suggest.
 103
 104    If `type' is a dynamic class (i.e. one with a vtable), then GDB can
 105    actually determine the object's run-time type by looking at the
 106    run-time type information in the vtable.  When this information is
 107    available, we may elect to read in the entire object, for several
 108    reasons:
 109
 110    - When printing the value, the user would probably rather see the
 111      full object, not just the limited portion apparent from the
 112      compile-time type.
 113
 114    - If `type' has virtual base classes, then even printing `type'
 115      alone may require reaching outside the `type' portion of the
 116      object to wherever the virtual base class has been stored.
 117
 118    When we store the entire object, `enclosing_type' is the run-time
 119    type -- the complete object -- and `embedded_offset' is the offset
 120    of `type' within that larger type, in bytes.  The value_contents()
 121    macro takes `embedded_offset' into account, so most GDB code
 122    continues to see the `type' portion of the value, just as the
 123    inferior would.
 124
 125    If `type' is a pointer to an object, then `enclosing_type' is a
 126    pointer to the object's run-time type, and `pointed_to_offset' is
 127    the offset in bytes from the full object to the pointed-to object
 128    -- that is, the value `embedded_offset' would have if we followed
 129    the pointer and fetched the complete object.  (I don't really see
 130    the point.  Why not just determine the run-time type when you
 131    indirect, and avoid the special case?  The contents don't matter
 132    until you indirect anyway.)
 133
 134    If we're not doing anything fancy, `enclosing_type' is equal to
 135    `type', and `embedded_offset' is zero, so everything works
 136    normally.  */
 137
 138 extern struct type *value_enclosing_type (struct value *);
 139 extern void set_value_enclosing_type (struct value *val,
 140                                       struct type *new_type);
 141
 142 extern int value_pointed_to_offset (struct value *value);
 143 extern void set_value_pointed_to_offset (struct value *value, int val);
 144 extern int value_embedded_offset (struct value *value);
 145 extern void set_value_embedded_offset (struct value *value, int val);
 146
 147 /* For lval_computed values, this structure holds functions used to
 148    retrieve and set the value (or portions of the value).
 149
 150    For each function, 'V' is the 'this' pointer: an lval_funcs
 151    function F may always assume that the V it receives is an
 152    lval_computed value, and has F in the appropriate slot of its
 153    lval_funcs structure.  */
 154
 155 struct lval_funcs
 156 {
 157   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
 158      a problem arises in obtaining VALUE's bits, this function should
 159      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
 160      non-optimized-out value is an internal error.  */
 161   void (*read) (struct value *v);
 162
 163   /* Handle an assignment TOVAL = FROMVAL by writing the value of
 164      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
 165      been updated.  If a problem arises in doing so, this function
 166      should call 'error'.  If it is NULL such TOVAL assignment is an error as
 167      TOVAL is not considered as an lvalue.  */
 168   void (*write) (struct value *toval, struct value *fromval);
 169
 170   /* Check the validity of some bits in VALUE.  This should return 1
 171      if all the bits starting at OFFSET and extending for LENGTH bits
 172      are valid, or 0 if any bit is invalid.  */
 173   int (*check_validity) (const struct value *value, int offset, int length);
 174
 175   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 176   int (*check_any_valid) (const struct value *value);
 177
 178   /* If non-NULL, this is used to implement pointer indirection for
 179      this value.  This method may return NULL, in which case value_ind
 180      will fall back to ordinary indirection.  */
 181   struct value *(*indirect) (struct value *value);
 182
 183   /* If non-NULL, this is used to determine whether the indicated bits
 184      of VALUE are a synthetic pointer.  */
 185   int (*check_synthetic_pointer) (const struct value *value,
 186                                   int offset, int length);
 187
 188   /* Return a duplicate of VALUE's closure, for use in a new value.
 189      This may simply return the same closure, if VALUE's is
 190      reference-counted or statically allocated.
 191
 192      This may be NULL, in which case VALUE's closure is re-used in the
 193      new value.  */
 194   void *(*copy_closure) (const struct value *v);
 195
 196   /* Drop VALUE's reference to its closure.  Maybe this frees the
 197      closure; maybe this decrements a reference count; maybe the
 198      closure is statically allocated and this does nothing.
 199
 200      This may be NULL, in which case no action is taken to free
 201      VALUE's closure.  */
 202   void (*free_closure) (struct value *v);
 203 };
 204
 205 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 206    and closure CLOSURE.  */
 207
 208 extern struct value *allocate_computed_value (struct type *type,
 209                                               const struct lval_funcs *funcs,
 210                                               void *closure);
 211
 212 extern struct value *allocate_optimized_out_value (struct type *type);
 213
 214 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 215
 216 extern const struct lval_funcs *value_computed_funcs (struct value *value);
 217
 218 /* If VALUE is lval_computed, return its closure.  The meaning of the
 219    returned value depends on the functions VALUE uses.  */
 220
 221 extern void *value_computed_closure (const struct value *value);
 222
 223 /* If zero, contents of this value are in the contents field.  If
 224    nonzero, contents are in inferior.  If the lval field is lval_memory,
 225    the contents are in inferior memory at location.address plus offset.
 226    The lval field may also be lval_register.
 227
 228    WARNING: This field is used by the code which handles watchpoints
 229    (see breakpoint.c) to decide whether a particular value can be
 230    watched by hardware watchpoints.  If the lazy flag is set for some
 231    member of a value chain, it is assumed that this member of the
 232    chain doesn't need to be watched as part of watching the value
 233    itself.  This is how GDB avoids watching the entire struct or array
 234    when the user wants to watch a single struct member or array
 235    element.  If you ever change the way lazy flag is set and reset, be
 236    sure to consider this use as well!  */
 237
 238 extern int value_lazy (struct value *);
 239 extern void set_value_lazy (struct value *value, int val);
 240
 241 extern int value_stack (struct value *);
 242 extern void set_value_stack (struct value *value, int val);
 243
 244 /* value_contents() and value_contents_raw() both return the address
 245    of the gdb buffer used to hold a copy of the contents of the lval.
 246    value_contents() is used when the contents of the buffer are needed
 247    -- it uses value_fetch_lazy() to load the buffer from the process
 248    being debugged if it hasn't already been loaded
 249    (value_contents_writeable() is used when a writeable but fetched
 250    buffer is required)..  value_contents_raw() is used when data is
 251    being stored into the buffer, or when it is certain that the
 252    contents of the buffer are valid.
 253
 254    Note: The contents pointer is adjusted by the offset required to
 255    get to the real subobject, if the value happens to represent
 256    something embedded in a larger run-time object.  */
 257
 258 extern gdb_byte *value_contents_raw (struct value *);
 259
 260 /* Actual contents of the value.  For use of this value; setting it
 261    uses the stuff above.  Not valid if lazy is nonzero.  Target
 262    byte-order.  We force it to be aligned properly for any possible
 263    value.  Note that a value therefore extends beyond what is
 264    declared here.  */
 265
 266 extern const gdb_byte *value_contents (struct value *);
 267 extern gdb_byte *value_contents_writeable (struct value *);
 268
 269 /* The ALL variants of the above two macros do not adjust the returned
 270    pointer by the embedded_offset value.  */
 271
 272 extern gdb_byte *value_contents_all_raw (struct value *);
 273 extern const gdb_byte *value_contents_all (struct value *);
 274
 275 /* Like value_contents_all, but does not require that the returned
 276    bits be valid.  This should only be used in situations where you
 277    plan to check the validity manually.  */
 278 extern const gdb_byte *value_contents_for_printing (struct value *value);
 279
 280 /* Like value_contents_for_printing, but accepts a constant value
 281    pointer.  Unlike value_contents_for_printing however, the pointed
 282    value must _not_ be lazy.  */
 283 extern const gdb_byte *
 284   value_contents_for_printing_const (const struct value *value);
 285
 286 extern int value_fetch_lazy (struct value *val);
 287 extern int value_contents_equal (struct value *val1, struct value *val2);
 288
 289 /* If nonzero, this is the value of a variable which does not actually
 290    exist in the program.  */
 291 extern int value_optimized_out (struct value *value);
 292 extern void set_value_optimized_out (struct value *value, int val);
 293
 294 /* Like value_optimized_out, but return false if any bit in the object
 295    is valid.  */
 296 extern int value_entirely_optimized_out (const struct value *value);
 297
 298 /* Set or return field indicating whether a variable is initialized or
 299    not, based on debugging information supplied by the compiler.
 300    1 = initialized; 0 = uninitialized.  */
 301 extern int value_initialized (struct value *);
 302 extern void set_value_initialized (struct value *, int);
 303
 304 /* Set COMPONENT's location as appropriate for a component of WHOLE
 305    --- regardless of what kind of lvalue WHOLE is.  */
 306 extern void set_value_component_location (struct value *component,
 307                                           const struct value *whole);
 308
 309 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 310    single value might have multiple LVALs), this hacked interface is
 311    limited to just the first PIECE.  Expect further change.  */
 312 /* Type of value; either not an lval, or one of the various different
 313    possible kinds of lval.  */
 314 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 315 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 316
 317 /* If lval == lval_memory, return the address in the inferior.  If
 318    lval == lval_register, return the byte offset into the registers
 319    structure.  Otherwise, return 0.  The returned address
 320    includes the offset, if any.  */
 321 extern CORE_ADDR value_address (const struct value *);
 322
 323 /* Like value_address, except the result does not include value's
 324    offset.  */
 325 extern CORE_ADDR value_raw_address (struct value *);
 326
 327 /* Set the address of a value.  */
 328 extern void set_value_address (struct value *, CORE_ADDR);
 329
 330 /* Pointer to internal variable.  */
 331 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 332 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 333
 334 /* Frame register value is relative to.  This will be described in the
 335    lval enum above as "lval_register".  */
 336 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 337 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 338
 339 /* Register number if the value is from a register.  */
 340 extern short *deprecated_value_regnum_hack (struct value *);
 341 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 342
 343 /* Convert a REF to the object referenced.  */
 344
 345 extern struct value *coerce_ref (struct value *value);
 346
 347 /* If ARG is an array, convert it to a pointer.
 348    If ARG is a function, convert it to a function pointer.
 349
 350    References are dereferenced.  */
 351
 352 extern struct value *coerce_array (struct value *value);
 353
 354 /* Given a value, determine whether the bits starting at OFFSET and
 355    extending for LENGTH bits are valid.  This returns nonzero if all
 356    bits in the given range are valid, zero if any bit is invalid.  */
 357
 358 extern int value_bits_valid (const struct value *value,
 359                              int offset, int length);
 360
 361 /* Given a value, determine whether the bits starting at OFFSET and
 362    extending for LENGTH bits are a synthetic pointer.  */
 363
 364 extern int value_bits_synthetic_pointer (const struct value *value,
 365                                          int offset, int length);
 366
 367 /* Given a value, determine whether the contents bytes starting at
 368    OFFSET and extending for LENGTH bytes are available.  This returns
 369    nonzero if all bytes in the given range are available, zero if any
 370    byte is unavailable.  */
 371
 372 extern int value_bytes_available (const struct value *value,
 373                                   int offset, int length);
 374
 375 /* Like value_bytes_available, but return false if any byte in the
 376    whole object is unavailable.  */
 377 extern int value_entirely_available (struct value *value);
 378
 379 /* Mark VALUE's content bytes starting at OFFSET and extending for
 380    LENGTH bytes as unavailable.  */
 381
 382 extern void mark_value_bytes_unavailable (struct value *value,
 383                                           int offset, int length);
 384
 385 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 386    LENGTH bytes of VAL2's contents starting at OFFSET2.
 387
 388    Note that "contents" refers to the whole value's contents
 389    (value_contents_all), without any embedded offset adjustment.  For
 390    example, to compare a complete object value with itself, including
 391    its enclosing type chunk, you'd do:
 392
 393      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 394      value_available_contents (val, 0, val, 0, len);
 395
 396    Returns true iff the set of available contents match.  Unavailable
 397    contents compare equal with unavailable contents, and different
 398    with any available byte.  For example, if 'x's represent an
 399    unavailable byte, and 'V' and 'Z' represent different available
 400    bytes, in a value with length 16:
 401
 402    offset:   0   4   8   12  16
 403    contents: xxxxVVVVxxxxVVZZ
 404
 405    then:
 406
 407    value_available_contents_eq(val, 0, val, 8, 6) => 1
 408    value_available_contents_eq(val, 0, val, 4, 4) => 1
 409    value_available_contents_eq(val, 0, val, 8, 8) => 0
 410    value_available_contents_eq(val, 4, val, 12, 2) => 1
 411    value_available_contents_eq(val, 4, val, 12, 4) => 0
 412    value_available_contents_eq(val, 3, val, 4, 4) => 0
 413 */
 414
 415 extern int value_available_contents_eq (const struct value *val1, int offset1,
 416                                         const struct value *val2, int offset2,
 417                                         int length);
 418
 419 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 420    is (or will be copied to) VAL's contents buffer offset by
 421    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 422    Marks value contents ranges as unavailable if the corresponding
 423    memory is likewise unavailable.  STACK indicates whether the memory
 424    is known to be stack memory.  */
 425
 426 extern void read_value_memory (struct value *val, int embedded_offset,
 427                                int stack, CORE_ADDR memaddr,
 428                                gdb_byte *buffer, size_t length);
 429
 430 \f
 431
 432 #include "symtab.h"
 433 #include "gdbtypes.h"
 434 #include "expression.h"
 435
 436 struct frame_info;
 437 struct fn_field;
 438
 439 extern void print_address_demangle (struct gdbarch *, CORE_ADDR,
 440                                     struct ui_file *, int);
 441
 442 extern LONGEST value_as_long (struct value *val);
 443 extern DOUBLEST value_as_double (struct value *val);
 444 extern CORE_ADDR value_as_address (struct value *val);
 445
 446 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 447 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 448                                int *invp);
 449 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 450
 451 extern int unpack_value_bits_as_long (struct type *field_type,
 452                                       const gdb_byte *valaddr,
 453                                       int embedded_offset, int bitpos,
 454                                       int bitsize,
 455                                       const struct value *original_value,
 456                                       LONGEST *result);
 457
 458 extern LONGEST unpack_field_as_long (struct type *type,
 459                                      const gdb_byte *valaddr,
 460                                      int fieldno);
 461 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 462                                 int embedded_offset, int fieldno,
 463                                 const struct value *val, LONGEST *result);
 464
 465 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 466                                            const gdb_byte *valaddr,
 467                                            int embedded_offset,
 468                                            const struct value *val);
 469
 470 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 471
 472 extern struct value *value_from_longest (struct type *type, LONGEST num);
 473 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 474 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 475 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 476 extern struct value *value_from_decfloat (struct type *type,
 477                                           const gdb_byte *decbytes);
 478 extern struct value *value_from_history_ref (char *, char **);
 479
 480 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 481 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 482
 483 extern struct value *value_from_contents_and_address (struct type *,
 484                                                       const gdb_byte *,
 485                                                       CORE_ADDR);
 486 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 487
 488 extern struct value *default_value_from_register (struct type *type,
 489                                                   int regnum,
 490                                                   struct frame_info *frame);
 491
 492 extern struct value *value_from_register (struct type *type, int regnum,
 493                                           struct frame_info *frame);
 494
 495 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 496                                         struct frame_info *frame);
 497
 498 extern struct value *value_of_variable (struct symbol *var, struct block *b);
 499
 500 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 501
 502 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 503
 504 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 505
 506 extern int symbol_read_needs_frame (struct symbol *);
 507
 508 extern struct value *read_var_value (struct symbol *var,
 509                                      struct frame_info *frame);
 510
 511 extern struct value *allocate_value (struct type *type);
 512 extern struct value *allocate_value_lazy (struct type *type);
 513 extern void allocate_value_contents (struct value *value);
 514 extern void value_contents_copy (struct value *dst, int dst_offset,
 515                                  struct value *src, int src_offset,
 516                                  int length);
 517 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 518                                      struct value *src, int src_offset,
 519                                      int length);
 520
 521 extern struct value *allocate_repeat_value (struct type *type, int count);
 522
 523 extern struct value *value_mark (void);
 524
 525 extern void value_free_to_mark (struct value *mark);
 526
 527 extern struct value *value_cstring (char *ptr, int len,
 528                                     struct type *char_type);
 529 extern struct value *value_string (char *ptr, int len,
 530                                    struct type *char_type);
 531 extern struct value *value_bitstring (char *ptr, int len,
 532                                       struct type *index_type);
 533
 534 extern struct value *value_array (int lowbound, int highbound,
 535                                   struct value **elemvec);
 536
 537 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 538
 539 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 540                                   enum exp_opcode op);
 541
 542 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 543
 544 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 545
 546 extern int value_must_coerce_to_target (struct value *arg1);
 547
 548 extern struct value *value_coerce_to_target (struct value *arg1);
 549
 550 extern struct value *value_coerce_array (struct value *arg1);
 551
 552 extern struct value *value_coerce_function (struct value *arg1);
 553
 554 extern struct value *value_ind (struct value *arg1);
 555
 556 extern struct value *value_addr (struct value *arg1);
 557
 558 extern struct value *value_ref (struct value *arg1);
 559
 560 extern struct value *value_assign (struct value *toval,
 561                                    struct value *fromval);
 562
 563 extern struct value *value_pos (struct value *arg1);
 564
 565 extern struct value *value_neg (struct value *arg1);
 566
 567 extern struct value *value_complement (struct value *arg1);
 568
 569 extern struct value *value_struct_elt (struct value **argp,
 570                                        struct value **args,
 571                                        const char *name, int *static_memfuncp,
 572                                        const char *err);
 573
 574 extern struct value *value_aggregate_elt (struct type *curtype,
 575                                           char *name,
 576                                           struct type *expect_type,
 577                                           int want_address,
 578                                           enum noside noside);
 579
 580 extern struct value *value_static_field (struct type *type, int fieldno);
 581
 582 extern struct fn_field *value_find_oload_method_list (struct value **,
 583                                                       const char *,
 584                                                       int, int *,
 585                                                       struct type **, int *);
 586
 587 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 588
 589 extern int find_overload_match (struct type **arg_types, int nargs,
 590                                 const char *name,
 591                                 enum oload_search_type method, int lax,
 592                                 struct value **objp, struct symbol *fsym,
 593                                 struct value **valp, struct symbol **symp,
 594                                 int *staticp, const int no_adl);
 595
 596 extern struct value *value_field (struct value *arg1, int fieldno);
 597
 598 extern struct value *value_primitive_field (struct value *arg1, int offset,
 599                                             int fieldno,
 600                                             struct type *arg_type);
 601
 602
 603 extern struct type *value_rtti_target_type (struct value *, int *, int *,
 604                                             int *);
 605
 606 extern struct value *value_full_object (struct value *, struct type *, int,
 607                                         int, int);
 608
 609 extern struct value *value_cast_pointers (struct type *, struct value *);
 610
 611 extern struct value *value_cast (struct type *type, struct value *arg2);
 612
 613 extern struct value *value_reinterpret_cast (struct type *type,
 614                                              struct value *arg);
 615
 616 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 617
 618 extern struct value *value_zero (struct type *type, enum lval_type lv);
 619
 620 extern struct value *value_one (struct type *type);
 621
 622 extern struct value *value_repeat (struct value *arg1, int count);
 623
 624 extern struct value *value_subscript (struct value *array, LONGEST index);
 625
 626 extern struct value *value_bitstring_subscript (struct type *type,
 627                                                 struct value *bitstring,
 628                                                 LONGEST index);
 629
 630 extern struct value *register_value_being_returned (struct type *valtype,
 631                                                     struct regcache *retbuf);
 632
 633 extern int value_in (struct value *element, struct value *set);
 634
 635 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 636                             int index);
 637
 638 extern int using_struct_return (struct gdbarch *gdbarch,
 639                                 struct type *func_type,
 640                                 struct type *value_type);
 641
 642 extern struct value *evaluate_expression (struct expression *exp);
 643
 644 extern struct value *evaluate_type (struct expression *exp);
 645
 646 extern struct value *evaluate_subexp (struct type *expect_type,
 647                                       struct expression *exp,
 648                                       int *pos, enum noside noside);
 649
 650 extern struct value *evaluate_subexpression_type (struct expression *exp,
 651                                                   int subexp);
 652
 653 extern void fetch_subexp_value (struct expression *exp, int *pc,
 654                                 struct value **valp, struct value **resultp,
 655                                 struct value **val_chain);
 656
 657 extern char *extract_field_op (struct expression *exp, int *subexp);
 658
 659 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 660                                                     int *, enum noside);
 661
 662 extern struct value *parse_and_eval (char *exp);
 663
 664 extern struct value *parse_to_comma_and_eval (char **expp);
 665
 666 extern struct type *parse_and_eval_type (char *p, int length);
 667
 668 extern CORE_ADDR parse_and_eval_address (char *exp);
 669
 670 extern LONGEST parse_and_eval_long (char *exp);
 671
 672 extern void unop_promote (const struct language_defn *language,
 673                           struct gdbarch *gdbarch,
 674                           struct value **arg1);
 675
 676 extern void binop_promote (const struct language_defn *language,
 677                            struct gdbarch *gdbarch,
 678                            struct value **arg1, struct value **arg2);
 679
 680 extern struct value *access_value_history (int num);
 681
 682 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 683                                            struct internalvar *var);
 684
 685 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 686
 687 extern void set_internalvar (struct internalvar *var, struct value *val);
 688
 689 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 690
 691 extern void set_internalvar_string (struct internalvar *var,
 692                                     const char *string);
 693
 694 extern void clear_internalvar (struct internalvar *var);
 695
 696 extern void set_internalvar_component (struct internalvar *var,
 697                                        int offset,
 698                                        int bitpos, int bitsize,
 699                                        struct value *newvalue);
 700
 701 extern struct internalvar *lookup_only_internalvar (const char *name);
 702
 703 extern struct internalvar *create_internalvar (const char *name);
 704
 705 typedef struct value * (*internalvar_make_value) (struct gdbarch *,
 706                                                   struct internalvar *);
 707 extern struct internalvar *
 708   create_internalvar_type_lazy (char *name, internalvar_make_value fun);
 709
 710 extern struct internalvar *lookup_internalvar (const char *name);
 711
 712 extern int value_equal (struct value *arg1, struct value *arg2);
 713
 714 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 715
 716 extern int value_less (struct value *arg1, struct value *arg2);
 717
 718 extern int value_logical_not (struct value *arg1);
 719
 720 /* C++ */
 721
 722 extern struct value *value_of_this (const struct language_defn *lang);
 723
 724 extern struct value *value_of_this_silent (const struct language_defn *lang);
 725
 726 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 727                                     enum exp_opcode op,
 728                                     enum exp_opcode otherop,
 729                                     enum noside noside);
 730
 731 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 732                                    enum noside noside);
 733
 734 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 735                                      int j, struct type *type, int offset);
 736
 737 extern int binop_types_user_defined_p (enum exp_opcode op,
 738                                        struct type *type1,
 739                                        struct type *type2);
 740
 741 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 742                                  struct value *arg2);
 743
 744 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 745
 746 extern int destructor_name_p (const char *name, struct type *type);
 747
 748 extern void value_incref (struct value *val);
 749
 750 extern void value_free (struct value *val);
 751
 752 extern void free_all_values (void);
 753
 754 extern void free_value_chain (struct value *v);
 755
 756 extern void release_value (struct value *val);
 757
 758 extern int record_latest_value (struct value *val);
 759
 760 extern void modify_field (struct type *type, gdb_byte *addr,
 761                           LONGEST fieldval, int bitpos, int bitsize);
 762
 763 extern void type_print (struct type *type, char *varstring,
 764                         struct ui_file *stream, int show);
 765
 766 extern char *type_to_string (struct type *type);
 767
 768 extern gdb_byte *baseclass_addr (struct type *type, int index,
 769                                  gdb_byte *valaddr,
 770                                  struct value **valuep, int *errp);
 771
 772 extern void print_longest (struct ui_file *stream, int format,
 773                            int use_local, LONGEST val);
 774
 775 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 776                             struct ui_file *stream);
 777
 778 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 779                                     struct ui_file *stream);
 780
 781 extern int value_print (struct value *val, struct ui_file *stream,
 782                         const struct value_print_options *options);
 783
 784 extern void value_print_array_elements (struct value *val,
 785                                         struct ui_file *stream, int format,
 786                                         enum val_prettyprint pretty);
 787
 788 extern struct value *value_release_to_mark (struct value *mark);
 789
 790 extern int val_print (struct type *type, const gdb_byte *valaddr,
 791                       int embedded_offset, CORE_ADDR address,
 792                       struct ui_file *stream, int recurse,
 793                       const struct value *val,
 794                       const struct value_print_options *options,
 795                       const struct language_defn *language);
 796
 797 extern int common_val_print (struct value *val,
 798                              struct ui_file *stream, int recurse,
 799                              const struct value_print_options *options,
 800                              const struct language_defn *language);
 801
 802 extern int val_print_string (struct type *elttype, const char *encoding,
 803                              CORE_ADDR addr, int len,
 804                              struct ui_file *stream,
 805                              const struct value_print_options *options);
 806
 807 extern void print_variable_and_value (const char *name,
 808                                       struct symbol *var,
 809                                       struct frame_info *frame,
 810                                       struct ui_file *stream,
 811                                       int indent);
 812
 813 extern int check_field (struct type *, const char *);
 814
 815 extern void typedef_print (struct type *type, struct symbol *news,
 816                            struct ui_file *stream);
 817
 818 extern char *internalvar_name (struct internalvar *var);
 819
 820 extern void preserve_values (struct objfile *);
 821
 822 /* From values.c */
 823
 824 extern struct value *value_copy (struct value *);
 825
 826 extern struct value *value_non_lval (struct value *);
 827
 828 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 829
 830 /* From valops.c */
 831
 832 extern struct value *varying_to_slice (struct value *);
 833
 834 extern struct value *value_slice (struct value *, int, int);
 835
 836 extern struct value *value_literal_complex (struct value *, struct value *,
 837                                             struct type *);
 838
 839 extern struct value *find_function_in_inferior (const char *,
 840                                                 struct objfile **);
 841
 842 extern struct value *value_allocate_space_in_inferior (int);
 843
 844 extern struct value *value_subscripted_rvalue (struct value *array,
 845                                                LONGEST index, int lowerbound);
 846
 847 /* User function handler.  */
 848
 849 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 850                                                const struct language_defn *language,
 851                                                void *cookie,
 852                                                int argc,
 853                                                struct value **argv);
 854
 855 void add_internal_function (const char *name, const char *doc,
 856                             internal_function_fn handler,
 857                             void *cookie);
 858
 859 struct value *call_internal_function (struct gdbarch *gdbarch,
 860                                       const struct language_defn *language,
 861                                       struct value *function,
 862                                       int argc, struct value **argv);
 863
 864 char *value_internal_function_name (struct value *);
 865
 866 #endif /* !defined (VALUE_H) */