gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986-2014 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 struct xmethod_worker;
  35
  36 /* The structure which defines the type of a value.  It should never
  37    be possible for a program lval value to survive over a call to the
  38    inferior (i.e. to be put into the history list or an internal
  39    variable).  */
  40
  41 struct value;
  42
  43 /* Values are stored in a chain, so that they can be deleted easily
  44    over calls to the inferior.  Values assigned to internal variables,
  45    put into the value history or exposed to Python are taken off this
  46    list.  */
  47
  48 struct value *value_next (struct value *);
  49
  50 /* Type of the value.  */
  51
  52 extern struct type *value_type (const struct value *);
  53
  54 /* This is being used to change the type of an existing value, that
  55    code should instead be creating a new value with the changed type
  56    (but possibly shared content).  */
  57
  58 extern void deprecated_set_value_type (struct value *value,
  59                                        struct type *type);
  60
  61 /* Only used for bitfields; number of bits contained in them.  */
  62
  63 extern int value_bitsize (const struct value *);
  64 extern void set_value_bitsize (struct value *, int bit);
  65
  66 /* Only used for bitfields; position of start of field.  For
  67    gdbarch_bits_big_endian=0 targets, it is the position of the LSB.  For
  68    gdbarch_bits_big_endian=1 targets, it is the position of the MSB.  */
  69
  70 extern int value_bitpos (const struct value *);
  71 extern void set_value_bitpos (struct value *, int bit);
  72
  73 /* Only used for bitfields; the containing value.  This allows a
  74    single read from the target when displaying multiple
  75    bitfields.  */
  76
  77 struct value *value_parent (struct value *);
  78 extern void set_value_parent (struct value *value, struct value *parent);
  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
  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 /* Returns value_type or value_enclosing_type depending on
 141    value_print_options.objectprint.
 142
 143    If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
 144    only for pointers and references, else it will be returned
 145    for all the types (e.g. structures).  This option is useful
 146    to prevent retrieving enclosing type for the base classes fields.
 147
 148    REAL_TYPE_FOUND is used to inform whether the real type was found
 149    (or just static type was used).  The NULL may be passed if it is not
 150    necessary. */
 151
 152 extern struct type *value_actual_type (struct value *value,
 153                                        int resolve_simple_types,
 154                                        int *real_type_found);
 155
 156 extern int value_pointed_to_offset (struct value *value);
 157 extern void set_value_pointed_to_offset (struct value *value, int val);
 158 extern int value_embedded_offset (struct value *value);
 159 extern void set_value_embedded_offset (struct value *value, int val);
 160
 161 /* For lval_computed values, this structure holds functions used to
 162    retrieve and set the value (or portions of the value).
 163
 164    For each function, 'V' is the 'this' pointer: an lval_funcs
 165    function F may always assume that the V it receives is an
 166    lval_computed value, and has F in the appropriate slot of its
 167    lval_funcs structure.  */
 168
 169 struct lval_funcs
 170 {
 171   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
 172      a problem arises in obtaining VALUE's bits, this function should
 173      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
 174      non-optimized-out value is an internal error.  */
 175   void (*read) (struct value *v);
 176
 177   /* Handle an assignment TOVAL = FROMVAL by writing the value of
 178      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
 179      been updated.  If a problem arises in doing so, this function
 180      should call 'error'.  If it is NULL such TOVAL assignment is an error as
 181      TOVAL is not considered as an lvalue.  */
 182   void (*write) (struct value *toval, struct value *fromval);
 183
 184   /* Check the validity of some bits in VALUE.  This should return 1
 185      if all the bits starting at OFFSET and extending for LENGTH bits
 186      are valid, or 0 if any bit is invalid.  */
 187   int (*check_validity) (const struct value *value, int offset, int length);
 188
 189   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 190   int (*check_any_valid) (const struct value *value);
 191
 192   /* If non-NULL, this is used to implement pointer indirection for
 193      this value.  This method may return NULL, in which case value_ind
 194      will fall back to ordinary indirection.  */
 195   struct value *(*indirect) (struct value *value);
 196
 197   /* If non-NULL, this is used to implement reference resolving for
 198      this value.  This method may return NULL, in which case coerce_ref
 199      will fall back to ordinary references resolving.  */
 200   struct value *(*coerce_ref) (const struct value *value);
 201
 202   /* If non-NULL, this is used to determine whether the indicated bits
 203      of VALUE are a synthetic pointer.  */
 204   int (*check_synthetic_pointer) (const struct value *value,
 205                                   int offset, int length);
 206
 207   /* Return a duplicate of VALUE's closure, for use in a new value.
 208      This may simply return the same closure, if VALUE's is
 209      reference-counted or statically allocated.
 210
 211      This may be NULL, in which case VALUE's closure is re-used in the
 212      new value.  */
 213   void *(*copy_closure) (const struct value *v);
 214
 215   /* Drop VALUE's reference to its closure.  Maybe this frees the
 216      closure; maybe this decrements a reference count; maybe the
 217      closure is statically allocated and this does nothing.
 218
 219      This may be NULL, in which case no action is taken to free
 220      VALUE's closure.  */
 221   void (*free_closure) (struct value *v);
 222 };
 223
 224 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 225    and closure CLOSURE.  */
 226
 227 extern struct value *allocate_computed_value (struct type *type,
 228                                               const struct lval_funcs *funcs,
 229                                               void *closure);
 230
 231 /* Helper function to check the validity of some bits of a value.
 232
 233    If TYPE represents some aggregate type (e.g., a structure), return 1.
 234
 235    Otherwise, any of the bytes starting at OFFSET and extending for
 236    TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
 237    return 0.  The checking is done using FUNCS.
 238
 239    Otherwise, return 1.  */
 240
 241 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
 242                                     int embedded_offset,
 243                                     const struct value *val);
 244
 245 extern struct value *allocate_optimized_out_value (struct type *type);
 246
 247 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 248
 249 extern const struct lval_funcs *value_computed_funcs (const struct value *);
 250
 251 /* If VALUE is lval_computed, return its closure.  The meaning of the
 252    returned value depends on the functions VALUE uses.  */
 253
 254 extern void *value_computed_closure (const struct value *value);
 255
 256 /* If zero, contents of this value are in the contents field.  If
 257    nonzero, contents are in inferior.  If the lval field is lval_memory,
 258    the contents are in inferior memory at location.address plus offset.
 259    The lval field may also be lval_register.
 260
 261    WARNING: This field is used by the code which handles watchpoints
 262    (see breakpoint.c) to decide whether a particular value can be
 263    watched by hardware watchpoints.  If the lazy flag is set for some
 264    member of a value chain, it is assumed that this member of the
 265    chain doesn't need to be watched as part of watching the value
 266    itself.  This is how GDB avoids watching the entire struct or array
 267    when the user wants to watch a single struct member or array
 268    element.  If you ever change the way lazy flag is set and reset, be
 269    sure to consider this use as well!  */
 270
 271 extern int value_lazy (struct value *);
 272 extern void set_value_lazy (struct value *value, int val);
 273
 274 extern int value_stack (struct value *);
 275 extern void set_value_stack (struct value *value, int val);
 276
 277 /* Throw an error complaining that the value has been optimized
 278    out.  */
 279
 280 extern void error_value_optimized_out (void);
 281
 282 /* value_contents() and value_contents_raw() both return the address
 283    of the gdb buffer used to hold a copy of the contents of the lval.
 284    value_contents() is used when the contents of the buffer are needed
 285    -- it uses value_fetch_lazy() to load the buffer from the process
 286    being debugged if it hasn't already been loaded
 287    (value_contents_writeable() is used when a writeable but fetched
 288    buffer is required)..  value_contents_raw() is used when data is
 289    being stored into the buffer, or when it is certain that the
 290    contents of the buffer are valid.
 291
 292    Note: The contents pointer is adjusted by the offset required to
 293    get to the real subobject, if the value happens to represent
 294    something embedded in a larger run-time object.  */
 295
 296 extern gdb_byte *value_contents_raw (struct value *);
 297
 298 /* Actual contents of the value.  For use of this value; setting it
 299    uses the stuff above.  Not valid if lazy is nonzero.  Target
 300    byte-order.  We force it to be aligned properly for any possible
 301    value.  Note that a value therefore extends beyond what is
 302    declared here.  */
 303
 304 extern const gdb_byte *value_contents (struct value *);
 305 extern gdb_byte *value_contents_writeable (struct value *);
 306
 307 /* The ALL variants of the above two macros do not adjust the returned
 308    pointer by the embedded_offset value.  */
 309
 310 extern gdb_byte *value_contents_all_raw (struct value *);
 311 extern const gdb_byte *value_contents_all (struct value *);
 312
 313 /* Like value_contents_all, but does not require that the returned
 314    bits be valid.  This should only be used in situations where you
 315    plan to check the validity manually.  */
 316 extern const gdb_byte *value_contents_for_printing (struct value *value);
 317
 318 /* Like value_contents_for_printing, but accepts a constant value
 319    pointer.  Unlike value_contents_for_printing however, the pointed
 320    value must _not_ be lazy.  */
 321 extern const gdb_byte *
 322   value_contents_for_printing_const (const struct value *value);
 323
 324 extern int value_fetch_lazy (struct value *val);
 325 extern int value_contents_equal (struct value *val1, struct value *val2);
 326
 327 /* If nonzero, this is the value of a variable which does not actually
 328    exist in the program, at least partially.  If the value is lazy,
 329    this may fetch it now.  */
 330 extern int value_optimized_out (struct value *value);
 331 extern void set_value_optimized_out (struct value *value, int val);
 332
 333 /* Like value_optimized_out, but don't fetch the value even if it is
 334    lazy.  Mainly useful for constructing other values using VALUE as
 335    template.  */
 336 extern int value_optimized_out_const (const struct value *value);
 337
 338 /* Like value_optimized_out, but return false if any bit in the object
 339    is valid.  */
 340 extern int value_entirely_optimized_out (const struct value *value);
 341
 342 /* Set or return field indicating whether a variable is initialized or
 343    not, based on debugging information supplied by the compiler.
 344    1 = initialized; 0 = uninitialized.  */
 345 extern int value_initialized (struct value *);
 346 extern void set_value_initialized (struct value *, int);
 347
 348 /* Set COMPONENT's location as appropriate for a component of WHOLE
 349    --- regardless of what kind of lvalue WHOLE is.  */
 350 extern void set_value_component_location (struct value *component,
 351                                           const struct value *whole);
 352
 353 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 354    single value might have multiple LVALs), this hacked interface is
 355    limited to just the first PIECE.  Expect further change.  */
 356 /* Type of value; either not an lval, or one of the various different
 357    possible kinds of lval.  */
 358 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 359 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 360
 361 /* Like VALUE_LVAL, except the parameter can be const.  */
 362 extern enum lval_type value_lval_const (const struct value *value);
 363
 364 /* If lval == lval_memory, return the address in the inferior.  If
 365    lval == lval_register, return the byte offset into the registers
 366    structure.  Otherwise, return 0.  The returned address
 367    includes the offset, if any.  */
 368 extern CORE_ADDR value_address (const struct value *);
 369
 370 /* Like value_address, except the result does not include value's
 371    offset.  */
 372 extern CORE_ADDR value_raw_address (struct value *);
 373
 374 /* Set the address of a value.  */
 375 extern void set_value_address (struct value *, CORE_ADDR);
 376
 377 /* Pointer to internal variable.  */
 378 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 379 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 380
 381 /* Frame register value is relative to.  This will be described in the
 382    lval enum above as "lval_register".  */
 383 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 384 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 385
 386 /* Register number if the value is from a register.  */
 387 extern short *deprecated_value_regnum_hack (struct value *);
 388 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 389
 390 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
 391    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
 392
 393 extern struct value *coerce_ref_if_computed (const struct value *arg);
 394
 395 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
 396    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
 397    ORIGINAL_VAL are the type and value of the original reference or pointer.
 398
 399    Note, that VALUE is modified by this function.
 400
 401    It is a common implementation for coerce_ref and value_ind.  */
 402
 403 extern struct value * readjust_indirect_value_type (struct value *value,
 404                                                     struct type *enc_type,
 405                                                     struct type *original_type,
 406                                                     struct value *original_val);
 407
 408 /* Convert a REF to the object referenced.  */
 409
 410 extern struct value *coerce_ref (struct value *value);
 411
 412 /* If ARG is an array, convert it to a pointer.
 413    If ARG is a function, convert it to a function pointer.
 414
 415    References are dereferenced.  */
 416
 417 extern struct value *coerce_array (struct value *value);
 418
 419 /* Given a value, determine whether the bits starting at OFFSET and
 420    extending for LENGTH bits are valid.  This returns nonzero if all
 421    bits in the given range are valid, zero if any bit is invalid.  */
 422
 423 extern int value_bits_valid (const struct value *value,
 424                              int offset, int length);
 425
 426 /* Given a value, determine whether the bits starting at OFFSET and
 427    extending for LENGTH bits are a synthetic pointer.  */
 428
 429 extern int value_bits_synthetic_pointer (const struct value *value,
 430                                          int offset, int length);
 431
 432 /* Given a value, determine whether the contents bytes starting at
 433    OFFSET and extending for LENGTH bytes are available.  This returns
 434    nonzero if all bytes in the given range are available, zero if any
 435    byte is unavailable.  */
 436
 437 extern int value_bytes_available (const struct value *value,
 438                                   int offset, int length);
 439
 440 /* Given a value, determine whether the contents bits starting at
 441    OFFSET and extending for LENGTH bits are available.  This returns
 442    nonzero if all bits in the given range are available, zero if any
 443    bit is unavailable.  */
 444
 445 extern int value_bits_available (const struct value *value,
 446                                  int offset, int length);
 447
 448 /* Like value_bytes_available, but return false if any byte in the
 449    whole object is unavailable.  */
 450 extern int value_entirely_available (struct value *value);
 451
 452 /* Like value_entirely_available, but return false if any byte in the
 453    whole object is available.  */
 454 extern int value_entirely_unavailable (struct value *value);
 455
 456 /* Mark VALUE's content bytes starting at OFFSET and extending for
 457    LENGTH bytes as unavailable.  */
 458
 459 extern void mark_value_bytes_unavailable (struct value *value,
 460                                           int offset, int length);
 461
 462 /* Mark VALUE's content bits starting at OFFSET and extending for
 463    LENGTH bits as unavailable.  */
 464
 465 extern void mark_value_bits_unavailable (struct value *value,
 466                                          int offset, int length);
 467
 468 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 469    LENGTH bytes of VAL2's contents starting at OFFSET2.
 470
 471    Note that "contents" refers to the whole value's contents
 472    (value_contents_all), without any embedded offset adjustment.  For
 473    example, to compare a complete object value with itself, including
 474    its enclosing type chunk, you'd do:
 475
 476      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 477      value_available_contents (val, 0, val, 0, len);
 478
 479    Returns true iff the set of available contents match.  Unavailable
 480    contents compare equal with unavailable contents, and different
 481    with any available byte.  For example, if 'x's represent an
 482    unavailable byte, and 'V' and 'Z' represent different available
 483    bytes, in a value with length 16:
 484
 485    offset:   0   4   8   12  16
 486    contents: xxxxVVVVxxxxVVZZ
 487
 488    then:
 489
 490    value_available_contents_eq(val, 0, val, 8, 6) => 1
 491    value_available_contents_eq(val, 0, val, 4, 4) => 1
 492    value_available_contents_eq(val, 0, val, 8, 8) => 0
 493    value_available_contents_eq(val, 4, val, 12, 2) => 1
 494    value_available_contents_eq(val, 4, val, 12, 4) => 0
 495    value_available_contents_eq(val, 3, val, 4, 4) => 0
 496
 497    We only know whether a value chunk is available if we've tried to
 498    read it.  As this routine is used by printing routines, which may
 499    be printing values in the value history, long after the inferior is
 500    gone, it works with const values.  Therefore, this routine must not
 501    be called with lazy values.  */
 502
 503 extern int value_available_contents_eq (const struct value *val1, int offset1,
 504                                         const struct value *val2, int offset2,
 505                                         int length);
 506
 507 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 508    is (or will be copied to) VAL's contents buffer offset by
 509    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 510    Marks value contents ranges as unavailable if the corresponding
 511    memory is likewise unavailable.  STACK indicates whether the memory
 512    is known to be stack memory.  */
 513
 514 extern void read_value_memory (struct value *val, int embedded_offset,
 515                                int stack, CORE_ADDR memaddr,
 516                                gdb_byte *buffer, size_t length);
 517
 518 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
 519    into each element of a new vector value with VECTOR_TYPE.  */
 520
 521 struct value *value_vector_widen (struct value *scalar_value,
 522                                   struct type *vector_type);
 523
 524 \f
 525
 526 #include "symtab.h"
 527 #include "gdbtypes.h"
 528 #include "expression.h"
 529
 530 struct frame_info;
 531 struct fn_field;
 532
 533 extern int print_address_demangle (const struct value_print_options *,
 534                                    struct gdbarch *, CORE_ADDR,
 535                                    struct ui_file *, int);
 536
 537 extern LONGEST value_as_long (struct value *val);
 538 extern DOUBLEST value_as_double (struct value *val);
 539 extern CORE_ADDR value_as_address (struct value *val);
 540
 541 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 542 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 543                                int *invp);
 544 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 545
 546 extern int unpack_value_bits_as_long (struct type *field_type,
 547                                       const gdb_byte *valaddr,
 548                                       int embedded_offset, int bitpos,
 549                                       int bitsize,
 550                                       const struct value *original_value,
 551                                       LONGEST *result);
 552
 553 extern LONGEST unpack_field_as_long (struct type *type,
 554                                      const gdb_byte *valaddr,
 555                                      int fieldno);
 556 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 557                                 int embedded_offset, int fieldno,
 558                                 const struct value *val, LONGEST *result);
 559
 560 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 561                                            const gdb_byte *valaddr,
 562                                            int embedded_offset,
 563                                            const struct value *val);
 564
 565 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 566
 567 extern struct value *value_from_longest (struct type *type, LONGEST num);
 568 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 569 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 570 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 571 extern struct value *value_from_decfloat (struct type *type,
 572                                           const gdb_byte *decbytes);
 573 extern struct value *value_from_history_ref (char *, char **);
 574
 575 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 576 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 577
 578 extern struct value *value_from_contents_and_address (struct type *,
 579                                                       const gdb_byte *,
 580                                                       CORE_ADDR);
 581 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 582
 583 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
 584                                                   struct type *type,
 585                                                   int regnum,
 586                                                   struct frame_id frame_id);
 587
 588 extern void read_frame_register_value (struct value *value,
 589                                        struct frame_info *frame);
 590
 591 extern struct value *value_from_register (struct type *type, int regnum,
 592                                           struct frame_info *frame);
 593
 594 extern CORE_ADDR address_from_register (int regnum,
 595                                         struct frame_info *frame);
 596
 597 extern struct value *value_of_variable (struct symbol *var,
 598                                         const struct block *b);
 599
 600 extern struct value *address_of_variable (struct symbol *var,
 601                                           const struct block *b);
 602
 603 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 604
 605 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 606
 607 extern int symbol_read_needs_frame (struct symbol *);
 608
 609 extern struct value *read_var_value (struct symbol *var,
 610                                      struct frame_info *frame);
 611
 612 extern struct value *default_read_var_value (struct symbol *var,
 613                                              struct frame_info *frame);
 614
 615 extern struct value *allocate_value (struct type *type);
 616 extern struct value *allocate_value_lazy (struct type *type);
 617 extern void value_contents_copy (struct value *dst, int dst_offset,
 618                                  struct value *src, int src_offset,
 619                                  int length);
 620 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 621                                      struct value *src, int src_offset,
 622                                      int length);
 623
 624 extern struct value *allocate_repeat_value (struct type *type, int count);
 625
 626 extern struct value *value_mark (void);
 627
 628 extern void value_free_to_mark (struct value *mark);
 629
 630 extern struct value *value_cstring (char *ptr, ssize_t len,
 631                                     struct type *char_type);
 632 extern struct value *value_string (char *ptr, ssize_t len,
 633                                    struct type *char_type);
 634
 635 extern struct value *value_array (int lowbound, int highbound,
 636                                   struct value **elemvec);
 637
 638 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 639
 640 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 641                                   enum exp_opcode op);
 642
 643 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 644
 645 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 646
 647 extern int value_must_coerce_to_target (struct value *arg1);
 648
 649 extern struct value *value_coerce_to_target (struct value *arg1);
 650
 651 extern struct value *value_coerce_array (struct value *arg1);
 652
 653 extern struct value *value_coerce_function (struct value *arg1);
 654
 655 extern struct value *value_ind (struct value *arg1);
 656
 657 extern struct value *value_addr (struct value *arg1);
 658
 659 extern struct value *value_ref (struct value *arg1);
 660
 661 extern struct value *value_assign (struct value *toval,
 662                                    struct value *fromval);
 663
 664 extern struct value *value_pos (struct value *arg1);
 665
 666 extern struct value *value_neg (struct value *arg1);
 667
 668 extern struct value *value_complement (struct value *arg1);
 669
 670 extern struct value *value_struct_elt (struct value **argp,
 671                                        struct value **args,
 672                                        const char *name, int *static_memfuncp,
 673                                        const char *err);
 674
 675 extern struct value *value_struct_elt_bitpos (struct value **argp,
 676                                               int bitpos,
 677                                               struct type *field_type,
 678                                               const char *err);
 679
 680 extern struct value *value_aggregate_elt (struct type *curtype,
 681                                           const char *name,
 682                                           struct type *expect_type,
 683                                           int want_address,
 684                                           enum noside noside);
 685
 686 extern struct value *value_static_field (struct type *type, int fieldno);
 687
 688 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 689
 690 extern int find_overload_match (struct value **args, int nargs,
 691                                 const char *name,
 692                                 enum oload_search_type method,
 693                                 struct value **objp, struct symbol *fsym,
 694                                 struct value **valp, struct symbol **symp,
 695                                 int *staticp, const int no_adl);
 696
 697 extern struct value *value_field (struct value *arg1, int fieldno);
 698
 699 extern struct value *value_primitive_field (struct value *arg1, int offset,
 700                                             int fieldno,
 701                                             struct type *arg_type);
 702
 703
 704 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 705                                               int *);
 706
 707 extern struct value *value_full_object (struct value *, struct type *, int,
 708                                         int, int);
 709
 710 extern struct value *value_cast_pointers (struct type *, struct value *, int);
 711
 712 extern struct value *value_cast (struct type *type, struct value *arg2);
 713
 714 extern struct value *value_reinterpret_cast (struct type *type,
 715                                              struct value *arg);
 716
 717 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 718
 719 extern struct value *value_zero (struct type *type, enum lval_type lv);
 720
 721 extern struct value *value_one (struct type *type);
 722
 723 extern struct value *value_repeat (struct value *arg1, int count);
 724
 725 extern struct value *value_subscript (struct value *array, LONGEST index);
 726
 727 extern struct value *value_bitstring_subscript (struct type *type,
 728                                                 struct value *bitstring,
 729                                                 LONGEST index);
 730
 731 extern struct value *register_value_being_returned (struct type *valtype,
 732                                                     struct regcache *retbuf);
 733
 734 extern int value_in (struct value *element, struct value *set);
 735
 736 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 737                             int index);
 738
 739 extern enum return_value_convention
 740 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
 741                           struct type *value_type);
 742
 743 extern int using_struct_return (struct gdbarch *gdbarch,
 744                                 struct value *function,
 745                                 struct type *value_type);
 746
 747 extern struct value *evaluate_expression (struct expression *exp);
 748
 749 extern struct value *evaluate_type (struct expression *exp);
 750
 751 extern struct value *evaluate_subexp (struct type *expect_type,
 752                                       struct expression *exp,
 753                                       int *pos, enum noside noside);
 754
 755 extern struct value *evaluate_subexpression_type (struct expression *exp,
 756                                                   int subexp);
 757
 758 extern void fetch_subexp_value (struct expression *exp, int *pc,
 759                                 struct value **valp, struct value **resultp,
 760                                 struct value **val_chain,
 761                                 int preserve_errors);
 762
 763 extern char *extract_field_op (struct expression *exp, int *subexp);
 764
 765 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 766                                                     int *, enum noside);
 767
 768 extern struct value *parse_and_eval (const char *exp);
 769
 770 extern struct value *parse_to_comma_and_eval (const char **expp);
 771
 772 extern struct type *parse_and_eval_type (char *p, int length);
 773
 774 extern CORE_ADDR parse_and_eval_address (const char *exp);
 775
 776 extern LONGEST parse_and_eval_long (const char *exp);
 777
 778 extern void unop_promote (const struct language_defn *language,
 779                           struct gdbarch *gdbarch,
 780                           struct value **arg1);
 781
 782 extern void binop_promote (const struct language_defn *language,
 783                            struct gdbarch *gdbarch,
 784                            struct value **arg1, struct value **arg2);
 785
 786 extern struct value *access_value_history (int num);
 787
 788 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 789                                            struct internalvar *var);
 790
 791 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 792
 793 extern void set_internalvar (struct internalvar *var, struct value *val);
 794
 795 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 796
 797 extern void set_internalvar_string (struct internalvar *var,
 798                                     const char *string);
 799
 800 extern void clear_internalvar (struct internalvar *var);
 801
 802 extern void set_internalvar_component (struct internalvar *var,
 803                                        int offset,
 804                                        int bitpos, int bitsize,
 805                                        struct value *newvalue);
 806
 807 extern struct internalvar *lookup_only_internalvar (const char *name);
 808
 809 extern struct internalvar *create_internalvar (const char *name);
 810
 811 extern VEC (char_ptr) *complete_internalvar (const char *name);
 812
 813 /* An internalvar can be dynamically computed by supplying a vector of
 814    function pointers to perform various operations.  */
 815
 816 struct internalvar_funcs
 817 {
 818   /* Compute the value of the variable.  The DATA argument passed to
 819      the function is the same argument that was passed to
 820      `create_internalvar_type_lazy'.  */
 821
 822   struct value *(*make_value) (struct gdbarch *arch,
 823                                struct internalvar *var,
 824                                void *data);
 825
 826   /* Update the agent expression EXPR with bytecode to compute the
 827      value.  VALUE is the agent value we are updating.  The DATA
 828      argument passed to this function is the same argument that was
 829      passed to `create_internalvar_type_lazy'.  If this pointer is
 830      NULL, then the internalvar cannot be compiled to an agent
 831      expression.  */
 832
 833   void (*compile_to_ax) (struct internalvar *var,
 834                          struct agent_expr *expr,
 835                          struct axs_value *value,
 836                          void *data);
 837
 838   /* If non-NULL, this is called to destroy DATA.  The DATA argument
 839      passed to this function is the same argument that was passed to
 840      `create_internalvar_type_lazy'.  */
 841
 842   void (*destroy) (void *data);
 843 };
 844
 845 extern struct internalvar *create_internalvar_type_lazy (const char *name,
 846                                 const struct internalvar_funcs *funcs,
 847                                 void *data);
 848
 849 /* Compile an internal variable to an agent expression.  VAR is the
 850    variable to compile; EXPR and VALUE are the agent expression we are
 851    updating.  This will return 0 if there is no known way to compile
 852    VAR, and 1 if VAR was successfully compiled.  It may also throw an
 853    exception on error.  */
 854
 855 extern int compile_internalvar_to_ax (struct internalvar *var,
 856                                       struct agent_expr *expr,
 857                                       struct axs_value *value);
 858
 859 extern struct internalvar *lookup_internalvar (const char *name);
 860
 861 extern int value_equal (struct value *arg1, struct value *arg2);
 862
 863 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 864
 865 extern int value_less (struct value *arg1, struct value *arg2);
 866
 867 extern int value_logical_not (struct value *arg1);
 868
 869 /* C++ */
 870
 871 extern struct value *value_of_this (const struct language_defn *lang);
 872
 873 extern struct value *value_of_this_silent (const struct language_defn *lang);
 874
 875 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 876                                     enum exp_opcode op,
 877                                     enum exp_opcode otherop,
 878                                     enum noside noside);
 879
 880 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 881                                    enum noside noside);
 882
 883 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 884                                      int j, struct type *type, int offset);
 885
 886 extern int binop_types_user_defined_p (enum exp_opcode op,
 887                                        struct type *type1,
 888                                        struct type *type2);
 889
 890 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 891                                  struct value *arg2);
 892
 893 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 894
 895 extern int destructor_name_p (const char *name, struct type *type);
 896
 897 extern void value_incref (struct value *val);
 898
 899 extern void value_free (struct value *val);
 900
 901 extern void free_all_values (void);
 902
 903 extern void free_value_chain (struct value *v);
 904
 905 extern void release_value (struct value *val);
 906
 907 extern void release_value_or_incref (struct value *val);
 908
 909 extern int record_latest_value (struct value *val);
 910
 911 extern void modify_field (struct type *type, gdb_byte *addr,
 912                           LONGEST fieldval, int bitpos, int bitsize);
 913
 914 extern void type_print (struct type *type, const char *varstring,
 915                         struct ui_file *stream, int show);
 916
 917 extern char *type_to_string (struct type *type);
 918
 919 extern gdb_byte *baseclass_addr (struct type *type, int index,
 920                                  gdb_byte *valaddr,
 921                                  struct value **valuep, int *errp);
 922
 923 extern void print_longest (struct ui_file *stream, int format,
 924                            int use_local, LONGEST val);
 925
 926 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 927                             struct ui_file *stream);
 928
 929 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 930                                     struct ui_file *stream);
 931
 932 extern void value_print (struct value *val, struct ui_file *stream,
 933                          const struct value_print_options *options);
 934
 935 extern void value_print_array_elements (struct value *val,
 936                                         struct ui_file *stream, int format,
 937                                         enum val_prettyformat pretty);
 938
 939 extern struct value *value_release_to_mark (struct value *mark);
 940
 941 extern void val_print (struct type *type, const gdb_byte *valaddr,
 942                        int embedded_offset, CORE_ADDR address,
 943                        struct ui_file *stream, int recurse,
 944                        const struct value *val,
 945                        const struct value_print_options *options,
 946                        const struct language_defn *language);
 947
 948 extern void common_val_print (struct value *val,
 949                               struct ui_file *stream, int recurse,
 950                               const struct value_print_options *options,
 951                               const struct language_defn *language);
 952
 953 extern int val_print_string (struct type *elttype, const char *encoding,
 954                              CORE_ADDR addr, int len,
 955                              struct ui_file *stream,
 956                              const struct value_print_options *options);
 957
 958 extern void print_variable_and_value (const char *name,
 959                                       struct symbol *var,
 960                                       struct frame_info *frame,
 961                                       struct ui_file *stream,
 962                                       int indent);
 963
 964 extern void typedef_print (struct type *type, struct symbol *news,
 965                            struct ui_file *stream);
 966
 967 extern char *internalvar_name (struct internalvar *var);
 968
 969 extern void preserve_values (struct objfile *);
 970
 971 /* From values.c */
 972
 973 extern struct value *value_copy (struct value *);
 974
 975 extern struct value *value_non_lval (struct value *);
 976
 977 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 978
 979 /* From valops.c */
 980
 981 extern struct value *varying_to_slice (struct value *);
 982
 983 extern struct value *value_slice (struct value *, int, int);
 984
 985 extern struct value *value_literal_complex (struct value *, struct value *,
 986                                             struct type *);
 987
 988 extern struct value *find_function_in_inferior (const char *,
 989                                                 struct objfile **);
 990
 991 extern struct value *value_allocate_space_in_inferior (int);
 992
 993 extern struct value *value_subscripted_rvalue (struct value *array,
 994                                                LONGEST index, int lowerbound);
 995
 996 /* User function handler.  */
 997
 998 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 999                                                const struct language_defn *language,
1000                                                void *cookie,
1001                                                int argc,
1002                                                struct value **argv);
1003
1004 void add_internal_function (const char *name, const char *doc,
1005                             internal_function_fn handler,
1006                             void *cookie);
1007
1008 struct value *call_internal_function (struct gdbarch *gdbarch,
1009                                       const struct language_defn *language,
1010                                       struct value *function,
1011                                       int argc, struct value **argv);
1012
1013 char *value_internal_function_name (struct value *);
1014
1015 extern struct value *value_of_xmethod (struct xmethod_worker *);
1016
1017 struct value *call_xmethod (struct value *function,
1018                             int argc, struct value **argv);
1019
1020 #endif /* !defined (VALUE_H) */