gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986-2012 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #if !defined (VALUE_H)
  21 #define VALUE_H 1
  22
  23 #include "doublest.h"
  24 #include "frame.h"              /* For struct frame_id.  */
  25
  26 struct block;
  27 struct expression;
  28 struct regcache;
  29 struct symbol;
  30 struct type;
  31 struct ui_file;
  32 struct language_defn;
  33 struct value_print_options;
  34
  35 /* The structure which defines the type of a value.  It should never
  36    be possible for a program lval value to survive over a call to the
  37    inferior (i.e. to be put into the history list or an internal
  38    variable).  */
  39
  40 struct value;
  41
  42 /* Values are stored in a chain, so that they can be deleted easily
  43    over calls to the inferior.  Values assigned to internal variables,
  44    put into the value history or exposed to Python are taken off this
  45    list.  */
  46
  47 struct value *value_next (struct value *);
  48
  49 /* Type of the value.  */
  50
  51 extern struct type *value_type (const struct value *);
  52
  53 /* This is being used to change the type of an existing value, that
  54    code should instead be creating a new value with the changed type
  55    (but possibly shared content).  */
  56
  57 extern void deprecated_set_value_type (struct value *value,
  58                                        struct type *type);
  59
  60 /* Only used for bitfields; number of bits contained in them.  */
  61
  62 extern int value_bitsize (const struct value *);
  63 extern void set_value_bitsize (struct value *, int bit);
  64
  65 /* Only used for bitfields; position of start of field.  For
  66    gdbarch_bits_big_endian=0 targets, it is the position of the LSB.  For
  67    gdbarch_bits_big_endian=1 targets, it is the position of the MSB.  */
  68
  69 extern int value_bitpos (const struct value *);
  70 extern void set_value_bitpos (struct value *, int bit);
  71
  72 /* Only used for bitfields; the containing value.  This allows a
  73    single read from the target when displaying multiple
  74    bitfields.  */
  75
  76 struct value *value_parent (struct value *);
  77 extern void set_value_parent (struct value *value, struct value *parent);
  78
  79 /* Describes offset of a value within lval of a structure in bytes.
  80    If lval == lval_memory, this is an offset to the address.  If lval
  81    == lval_register, this is a further offset from location.address
  82    within the registers structure.  Note also the member
  83    embedded_offset below.  */
  84
  85 extern int value_offset (const struct value *);
  86 extern void set_value_offset (struct value *, int offset);
  87
  88 /* The comment from "struct value" reads: ``Is it modifiable?  Only
  89    relevant if lval != not_lval.''.  Shouldn't the value instead be
  90    not_lval and be done with it?  */
  91
  92 extern int deprecated_value_modifiable (struct value *value);
  93 extern void deprecated_set_value_modifiable (struct value *value,
  94                                              int modifiable);
  95
  96 /* If a value represents a C++ object, then the `type' field gives the
  97    object's compile-time type.  If the object actually belongs to some
  98    class derived from `type', perhaps with other base classes and
  99    additional members, then `type' is just a subobject of the real
 100    thing, and the full object is probably larger than `type' would
 101    suggest.
 102
 103    If `type' is a dynamic class (i.e. one with a vtable), then GDB can
 104    actually determine the object's run-time type by looking at the
 105    run-time type information in the vtable.  When this information is
 106    available, we may elect to read in the entire object, for several
 107    reasons:
 108
 109    - When printing the value, the user would probably rather see the
 110      full object, not just the limited portion apparent from the
 111      compile-time type.
 112
 113    - If `type' has virtual base classes, then even printing `type'
 114      alone may require reaching outside the `type' portion of the
 115      object to wherever the virtual base class has been stored.
 116
 117    When we store the entire object, `enclosing_type' is the run-time
 118    type -- the complete object -- and `embedded_offset' is the offset
 119    of `type' within that larger type, in bytes.  The value_contents()
 120    macro takes `embedded_offset' into account, so most GDB code
 121    continues to see the `type' portion of the value, just as the
 122    inferior would.
 123
 124    If `type' is a pointer to an object, then `enclosing_type' is a
 125    pointer to the object's run-time type, and `pointed_to_offset' is
 126    the offset in bytes from the full object to the pointed-to object
 127    -- that is, the value `embedded_offset' would have if we followed
 128    the pointer and fetched the complete object.  (I don't really see
 129    the point.  Why not just determine the run-time type when you
 130    indirect, and avoid the special case?  The contents don't matter
 131    until you indirect anyway.)
 132
 133    If we're not doing anything fancy, `enclosing_type' is equal to
 134    `type', and `embedded_offset' is zero, so everything works
 135    normally.  */
 136
 137 extern struct type *value_enclosing_type (struct value *);
 138 extern void set_value_enclosing_type (struct value *val,
 139                                       struct type *new_type);
 140
 141 extern int value_pointed_to_offset (struct value *value);
 142 extern void set_value_pointed_to_offset (struct value *value, int val);
 143 extern int value_embedded_offset (struct value *value);
 144 extern void set_value_embedded_offset (struct value *value, int val);
 145
 146 /* For lval_computed values, this structure holds functions used to
 147    retrieve and set the value (or portions of the value).
 148
 149    For each function, 'V' is the 'this' pointer: an lval_funcs
 150    function F may always assume that the V it receives is an
 151    lval_computed value, and has F in the appropriate slot of its
 152    lval_funcs structure.  */
 153
 154 struct lval_funcs
 155 {
 156   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
 157      a problem arises in obtaining VALUE's bits, this function should
 158      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
 159      non-optimized-out value is an internal error.  */
 160   void (*read) (struct value *v);
 161
 162   /* Handle an assignment TOVAL = FROMVAL by writing the value of
 163      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
 164      been updated.  If a problem arises in doing so, this function
 165      should call 'error'.  If it is NULL such TOVAL assignment is an error as
 166      TOVAL is not considered as an lvalue.  */
 167   void (*write) (struct value *toval, struct value *fromval);
 168
 169   /* Check the validity of some bits in VALUE.  This should return 1
 170      if all the bits starting at OFFSET and extending for LENGTH bits
 171      are valid, or 0 if any bit is invalid.  */
 172   int (*check_validity) (const struct value *value, int offset, int length);
 173
 174   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 175   int (*check_any_valid) (const struct value *value);
 176
 177   /* If non-NULL, this is used to implement pointer indirection for
 178      this value.  This method may return NULL, in which case value_ind
 179      will fall back to ordinary indirection.  */
 180   struct value *(*indirect) (struct value *value);
 181
 182   /* If non-NULL, this is used to implement reference resolving for
 183      this value.  This method may return NULL, in which case coerce_ref
 184      will fall back to ordinary references resolving.  */
 185   struct value *(*coerce_ref) (const struct value *value);
 186
 187   /* If non-NULL, this is used to determine whether the indicated bits
 188      of VALUE are a synthetic pointer.  */
 189   int (*check_synthetic_pointer) (const struct value *value,
 190                                   int offset, int length);
 191
 192   /* Return a duplicate of VALUE's closure, for use in a new value.
 193      This may simply return the same closure, if VALUE's is
 194      reference-counted or statically allocated.
 195
 196      This may be NULL, in which case VALUE's closure is re-used in the
 197      new value.  */
 198   void *(*copy_closure) (const struct value *v);
 199
 200   /* Drop VALUE's reference to its closure.  Maybe this frees the
 201      closure; maybe this decrements a reference count; maybe the
 202      closure is statically allocated and this does nothing.
 203
 204      This may be NULL, in which case no action is taken to free
 205      VALUE's closure.  */
 206   void (*free_closure) (struct value *v);
 207 };
 208
 209 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 210    and closure CLOSURE.  */
 211
 212 extern struct value *allocate_computed_value (struct type *type,
 213                                               const struct lval_funcs *funcs,
 214                                               void *closure);
 215
 216 /* Helper function to check the validity of some bits of a value.
 217
 218    If TYPE represents some aggregate type (e.g., a structure), return 1.
 219
 220    Otherwise, any of the bytes starting at OFFSET and extending for
 221    TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
 222    return 0.  The checking is done using FUNCS.
 223
 224    Otherwise, return 1.  */
 225
 226 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
 227                                     int embedded_offset,
 228                                     const struct value *val);
 229
 230 extern struct value *allocate_optimized_out_value (struct type *type);
 231
 232 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 233
 234 extern const struct lval_funcs *value_computed_funcs (const struct value *);
 235
 236 /* If VALUE is lval_computed, return its closure.  The meaning of the
 237    returned value depends on the functions VALUE uses.  */
 238
 239 extern void *value_computed_closure (const struct value *value);
 240
 241 /* If zero, contents of this value are in the contents field.  If
 242    nonzero, contents are in inferior.  If the lval field is lval_memory,
 243    the contents are in inferior memory at location.address plus offset.
 244    The lval field may also be lval_register.
 245
 246    WARNING: This field is used by the code which handles watchpoints
 247    (see breakpoint.c) to decide whether a particular value can be
 248    watched by hardware watchpoints.  If the lazy flag is set for some
 249    member of a value chain, it is assumed that this member of the
 250    chain doesn't need to be watched as part of watching the value
 251    itself.  This is how GDB avoids watching the entire struct or array
 252    when the user wants to watch a single struct member or array
 253    element.  If you ever change the way lazy flag is set and reset, be
 254    sure to consider this use as well!  */
 255
 256 extern int value_lazy (struct value *);
 257 extern void set_value_lazy (struct value *value, int val);
 258
 259 extern int value_stack (struct value *);
 260 extern void set_value_stack (struct value *value, int val);
 261
 262 /* value_contents() and value_contents_raw() both return the address
 263    of the gdb buffer used to hold a copy of the contents of the lval.
 264    value_contents() is used when the contents of the buffer are needed
 265    -- it uses value_fetch_lazy() to load the buffer from the process
 266    being debugged if it hasn't already been loaded
 267    (value_contents_writeable() is used when a writeable but fetched
 268    buffer is required)..  value_contents_raw() is used when data is
 269    being stored into the buffer, or when it is certain that the
 270    contents of the buffer are valid.
 271
 272    Note: The contents pointer is adjusted by the offset required to
 273    get to the real subobject, if the value happens to represent
 274    something embedded in a larger run-time object.  */
 275
 276 extern gdb_byte *value_contents_raw (struct value *);
 277
 278 /* Actual contents of the value.  For use of this value; setting it
 279    uses the stuff above.  Not valid if lazy is nonzero.  Target
 280    byte-order.  We force it to be aligned properly for any possible
 281    value.  Note that a value therefore extends beyond what is
 282    declared here.  */
 283
 284 extern const gdb_byte *value_contents (struct value *);
 285 extern gdb_byte *value_contents_writeable (struct value *);
 286
 287 /* The ALL variants of the above two macros do not adjust the returned
 288    pointer by the embedded_offset value.  */
 289
 290 extern gdb_byte *value_contents_all_raw (struct value *);
 291 extern const gdb_byte *value_contents_all (struct value *);
 292
 293 /* Like value_contents_all, but does not require that the returned
 294    bits be valid.  This should only be used in situations where you
 295    plan to check the validity manually.  */
 296 extern const gdb_byte *value_contents_for_printing (struct value *value);
 297
 298 /* Like value_contents_for_printing, but accepts a constant value
 299    pointer.  Unlike value_contents_for_printing however, the pointed
 300    value must _not_ be lazy.  */
 301 extern const gdb_byte *
 302   value_contents_for_printing_const (const struct value *value);
 303
 304 extern int value_fetch_lazy (struct value *val);
 305 extern int value_contents_equal (struct value *val1, struct value *val2);
 306
 307 /* If nonzero, this is the value of a variable which does not actually
 308    exist in the program.  */
 309 extern int value_optimized_out (struct value *value);
 310 extern void set_value_optimized_out (struct value *value, int val);
 311
 312 /* Like value_optimized_out, but return false if any bit in the object
 313    is valid.  */
 314 extern int value_entirely_optimized_out (const struct value *value);
 315
 316 /* Set or return field indicating whether a variable is initialized or
 317    not, based on debugging information supplied by the compiler.
 318    1 = initialized; 0 = uninitialized.  */
 319 extern int value_initialized (struct value *);
 320 extern void set_value_initialized (struct value *, int);
 321
 322 /* Set COMPONENT's location as appropriate for a component of WHOLE
 323    --- regardless of what kind of lvalue WHOLE is.  */
 324 extern void set_value_component_location (struct value *component,
 325                                           const struct value *whole);
 326
 327 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 328    single value might have multiple LVALs), this hacked interface is
 329    limited to just the first PIECE.  Expect further change.  */
 330 /* Type of value; either not an lval, or one of the various different
 331    possible kinds of lval.  */
 332 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 333 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 334
 335 /* Like VALUE_LVAL, except the parameter can be const.  */
 336 extern enum lval_type value_lval_const (const struct value *value);
 337
 338 /* If lval == lval_memory, return the address in the inferior.  If
 339    lval == lval_register, return the byte offset into the registers
 340    structure.  Otherwise, return 0.  The returned address
 341    includes the offset, if any.  */
 342 extern CORE_ADDR value_address (const struct value *);
 343
 344 /* Like value_address, except the result does not include value's
 345    offset.  */
 346 extern CORE_ADDR value_raw_address (struct value *);
 347
 348 /* Set the address of a value.  */
 349 extern void set_value_address (struct value *, CORE_ADDR);
 350
 351 /* Pointer to internal variable.  */
 352 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 353 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 354
 355 /* Frame register value is relative to.  This will be described in the
 356    lval enum above as "lval_register".  */
 357 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 358 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 359
 360 /* Register number if the value is from a register.  */
 361 extern short *deprecated_value_regnum_hack (struct value *);
 362 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 363
 364 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
 365    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
 366
 367 extern struct value *coerce_ref_if_computed (const struct value *arg);
 368
 369 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
 370    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
 371    ORIGINAL_VAL are the type and value of the original reference or pointer.
 372
 373    Note, that VALUE is modified by this function.
 374
 375    It is a common implementation for coerce_ref and value_ind.  */
 376
 377 extern struct value * readjust_indirect_value_type (struct value *value,
 378                                                     struct type *enc_type,
 379                                                     struct type *original_type,
 380                                                     struct value *original_val);
 381
 382 /* Convert a REF to the object referenced.  */
 383
 384 extern struct value *coerce_ref (struct value *value);
 385
 386 /* If ARG is an array, convert it to a pointer.
 387    If ARG is a function, convert it to a function pointer.
 388
 389    References are dereferenced.  */
 390
 391 extern struct value *coerce_array (struct value *value);
 392
 393 /* Given a value, determine whether the bits starting at OFFSET and
 394    extending for LENGTH bits are valid.  This returns nonzero if all
 395    bits in the given range are valid, zero if any bit is invalid.  */
 396
 397 extern int value_bits_valid (const struct value *value,
 398                              int offset, int length);
 399
 400 /* Given a value, determine whether the bits starting at OFFSET and
 401    extending for LENGTH bits are a synthetic pointer.  */
 402
 403 extern int value_bits_synthetic_pointer (const struct value *value,
 404                                          int offset, int length);
 405
 406 /* Given a value, determine whether the contents bytes starting at
 407    OFFSET and extending for LENGTH bytes are available.  This returns
 408    nonzero if all bytes in the given range are available, zero if any
 409    byte is unavailable.  */
 410
 411 extern int value_bytes_available (const struct value *value,
 412                                   int offset, int length);
 413
 414 /* Like value_bytes_available, but return false if any byte in the
 415    whole object is unavailable.  */
 416 extern int value_entirely_available (struct value *value);
 417
 418 /* Mark VALUE's content bytes starting at OFFSET and extending for
 419    LENGTH bytes as unavailable.  */
 420
 421 extern void mark_value_bytes_unavailable (struct value *value,
 422                                           int offset, int length);
 423
 424 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 425    LENGTH bytes of VAL2's contents starting at OFFSET2.
 426
 427    Note that "contents" refers to the whole value's contents
 428    (value_contents_all), without any embedded offset adjustment.  For
 429    example, to compare a complete object value with itself, including
 430    its enclosing type chunk, you'd do:
 431
 432      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 433      value_available_contents (val, 0, val, 0, len);
 434
 435    Returns true iff the set of available contents match.  Unavailable
 436    contents compare equal with unavailable contents, and different
 437    with any available byte.  For example, if 'x's represent an
 438    unavailable byte, and 'V' and 'Z' represent different available
 439    bytes, in a value with length 16:
 440
 441    offset:   0   4   8   12  16
 442    contents: xxxxVVVVxxxxVVZZ
 443
 444    then:
 445
 446    value_available_contents_eq(val, 0, val, 8, 6) => 1
 447    value_available_contents_eq(val, 0, val, 4, 4) => 1
 448    value_available_contents_eq(val, 0, val, 8, 8) => 0
 449    value_available_contents_eq(val, 4, val, 12, 2) => 1
 450    value_available_contents_eq(val, 4, val, 12, 4) => 0
 451    value_available_contents_eq(val, 3, val, 4, 4) => 0
 452 */
 453
 454 extern int value_available_contents_eq (const struct value *val1, int offset1,
 455                                         const struct value *val2, int offset2,
 456                                         int length);
 457
 458 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 459    is (or will be copied to) VAL's contents buffer offset by
 460    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 461    Marks value contents ranges as unavailable if the corresponding
 462    memory is likewise unavailable.  STACK indicates whether the memory
 463    is known to be stack memory.  */
 464
 465 extern void read_value_memory (struct value *val, int embedded_offset,
 466                                int stack, CORE_ADDR memaddr,
 467                                gdb_byte *buffer, size_t length);
 468
 469 \f
 470
 471 #include "symtab.h"
 472 #include "gdbtypes.h"
 473 #include "expression.h"
 474
 475 struct frame_info;
 476 struct fn_field;
 477
 478 extern void print_address_demangle (struct gdbarch *, CORE_ADDR,
 479                                     struct ui_file *, int);
 480
 481 extern LONGEST value_as_long (struct value *val);
 482 extern DOUBLEST value_as_double (struct value *val);
 483 extern CORE_ADDR value_as_address (struct value *val);
 484
 485 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 486 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 487                                int *invp);
 488 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 489
 490 extern int unpack_value_bits_as_long (struct type *field_type,
 491                                       const gdb_byte *valaddr,
 492                                       int embedded_offset, int bitpos,
 493                                       int bitsize,
 494                                       const struct value *original_value,
 495                                       LONGEST *result);
 496
 497 extern LONGEST unpack_field_as_long (struct type *type,
 498                                      const gdb_byte *valaddr,
 499                                      int fieldno);
 500 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 501                                 int embedded_offset, int fieldno,
 502                                 const struct value *val, LONGEST *result);
 503
 504 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 505                                            const gdb_byte *valaddr,
 506                                            int embedded_offset,
 507                                            const struct value *val);
 508
 509 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 510
 511 extern struct value *value_from_longest (struct type *type, LONGEST num);
 512 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 513 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 514 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 515 extern struct value *value_from_decfloat (struct type *type,
 516                                           const gdb_byte *decbytes);
 517 extern struct value *value_from_history_ref (char *, char **);
 518
 519 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 520 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 521
 522 extern struct value *value_from_contents_and_address (struct type *,
 523                                                       const gdb_byte *,
 524                                                       CORE_ADDR);
 525 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 526
 527 extern struct value *default_value_from_register (struct type *type,
 528                                                   int regnum,
 529                                                   struct frame_info *frame);
 530
 531 extern void read_frame_register_value (struct value *value,
 532                                        struct frame_info *frame);
 533
 534 extern struct value *value_from_register (struct type *type, int regnum,
 535                                           struct frame_info *frame);
 536
 537 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 538                                         struct frame_info *frame);
 539
 540 extern struct value *value_of_variable (struct symbol *var,
 541                                         const struct block *b);
 542
 543 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 544
 545 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 546
 547 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 548
 549 extern int symbol_read_needs_frame (struct symbol *);
 550
 551 extern struct value *read_var_value (struct symbol *var,
 552                                      struct frame_info *frame);
 553
 554 extern struct value *default_read_var_value (struct symbol *var,
 555                                              struct frame_info *frame);
 556
 557 extern struct value *allocate_value (struct type *type);
 558 extern struct value *allocate_value_lazy (struct type *type);
 559 extern void allocate_value_contents (struct value *value);
 560 extern void value_contents_copy (struct value *dst, int dst_offset,
 561                                  struct value *src, int src_offset,
 562                                  int length);
 563 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 564                                      struct value *src, int src_offset,
 565                                      int length);
 566
 567 extern struct value *allocate_repeat_value (struct type *type, int count);
 568
 569 extern struct value *value_mark (void);
 570
 571 extern void value_free_to_mark (struct value *mark);
 572
 573 extern struct value *value_cstring (char *ptr, int len,
 574                                     struct type *char_type);
 575 extern struct value *value_string (char *ptr, int len,
 576                                    struct type *char_type);
 577 extern struct value *value_bitstring (char *ptr, int len,
 578                                       struct type *index_type);
 579
 580 extern struct value *value_array (int lowbound, int highbound,
 581                                   struct value **elemvec);
 582
 583 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 584
 585 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 586                                   enum exp_opcode op);
 587
 588 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 589
 590 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 591
 592 extern int value_must_coerce_to_target (struct value *arg1);
 593
 594 extern struct value *value_coerce_to_target (struct value *arg1);
 595
 596 extern struct value *value_coerce_array (struct value *arg1);
 597
 598 extern struct value *value_coerce_function (struct value *arg1);
 599
 600 extern struct value *value_ind (struct value *arg1);
 601
 602 extern struct value *value_addr (struct value *arg1);
 603
 604 extern struct value *value_ref (struct value *arg1);
 605
 606 extern struct value *value_assign (struct value *toval,
 607                                    struct value *fromval);
 608
 609 extern struct value *value_pos (struct value *arg1);
 610
 611 extern struct value *value_neg (struct value *arg1);
 612
 613 extern struct value *value_complement (struct value *arg1);
 614
 615 extern struct value *value_struct_elt (struct value **argp,
 616                                        struct value **args,
 617                                        const char *name, int *static_memfuncp,
 618                                        const char *err);
 619
 620 extern struct value *value_aggregate_elt (struct type *curtype,
 621                                           char *name,
 622                                           struct type *expect_type,
 623                                           int want_address,
 624                                           enum noside noside);
 625
 626 extern struct value *value_static_field (struct type *type, int fieldno);
 627
 628 extern struct fn_field *value_find_oload_method_list (struct value **,
 629                                                       const char *,
 630                                                       int, int *,
 631                                                       struct type **, int *);
 632
 633 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 634
 635 extern int find_overload_match (struct value **args, int nargs,
 636                                 const char *name,
 637                                 enum oload_search_type method, int lax,
 638                                 struct value **objp, struct symbol *fsym,
 639                                 struct value **valp, struct symbol **symp,
 640                                 int *staticp, const int no_adl);
 641
 642 extern struct value *value_field (struct value *arg1, int fieldno);
 643
 644 extern struct value *value_primitive_field (struct value *arg1, int offset,
 645                                             int fieldno,
 646                                             struct type *arg_type);
 647
 648
 649 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 650                                               int *);
 651
 652 extern struct value *value_full_object (struct value *, struct type *, int,
 653                                         int, int);
 654
 655 extern struct value *value_cast_pointers (struct type *, struct value *);
 656
 657 extern struct value *value_cast (struct type *type, struct value *arg2);
 658
 659 extern struct value *value_reinterpret_cast (struct type *type,
 660                                              struct value *arg);
 661
 662 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 663
 664 extern struct value *value_zero (struct type *type, enum lval_type lv);
 665
 666 extern struct value *value_one (struct type *type);
 667
 668 extern struct value *value_repeat (struct value *arg1, int count);
 669
 670 extern struct value *value_subscript (struct value *array, LONGEST index);
 671
 672 extern struct value *value_bitstring_subscript (struct type *type,
 673                                                 struct value *bitstring,
 674                                                 LONGEST index);
 675
 676 extern struct value *register_value_being_returned (struct type *valtype,
 677                                                     struct regcache *retbuf);
 678
 679 extern int value_in (struct value *element, struct value *set);
 680
 681 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 682                             int index);
 683
 684 extern int using_struct_return (struct gdbarch *gdbarch,
 685                                 struct type *func_type,
 686                                 struct type *value_type);
 687
 688 extern struct value *evaluate_expression (struct expression *exp);
 689
 690 extern struct value *evaluate_type (struct expression *exp);
 691
 692 extern struct value *evaluate_subexp (struct type *expect_type,
 693                                       struct expression *exp,
 694                                       int *pos, enum noside noside);
 695
 696 extern struct value *evaluate_subexpression_type (struct expression *exp,
 697                                                   int subexp);
 698
 699 extern void fetch_subexp_value (struct expression *exp, int *pc,
 700                                 struct value **valp, struct value **resultp,
 701                                 struct value **val_chain);
 702
 703 extern char *extract_field_op (struct expression *exp, int *subexp);
 704
 705 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 706                                                     int *, enum noside);
 707
 708 extern struct value *parse_and_eval (char *exp);
 709
 710 extern struct value *parse_to_comma_and_eval (char **expp);
 711
 712 extern struct type *parse_and_eval_type (char *p, int length);
 713
 714 extern CORE_ADDR parse_and_eval_address (char *exp);
 715
 716 extern LONGEST parse_and_eval_long (char *exp);
 717
 718 extern void unop_promote (const struct language_defn *language,
 719                           struct gdbarch *gdbarch,
 720                           struct value **arg1);
 721
 722 extern void binop_promote (const struct language_defn *language,
 723                            struct gdbarch *gdbarch,
 724                            struct value **arg1, struct value **arg2);
 725
 726 extern struct value *access_value_history (int num);
 727
 728 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 729                                            struct internalvar *var);
 730
 731 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 732
 733 extern void set_internalvar (struct internalvar *var, struct value *val);
 734
 735 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 736
 737 extern void set_internalvar_string (struct internalvar *var,
 738                                     const char *string);
 739
 740 extern void clear_internalvar (struct internalvar *var);
 741
 742 extern void set_internalvar_component (struct internalvar *var,
 743                                        int offset,
 744                                        int bitpos, int bitsize,
 745                                        struct value *newvalue);
 746
 747 extern struct internalvar *lookup_only_internalvar (const char *name);
 748
 749 extern struct internalvar *create_internalvar (const char *name);
 750
 751 typedef struct value * (*internalvar_make_value) (struct gdbarch *,
 752                                                   struct internalvar *);
 753 extern struct internalvar *
 754   create_internalvar_type_lazy (char *name, internalvar_make_value fun);
 755
 756 extern struct internalvar *lookup_internalvar (const char *name);
 757
 758 extern int value_equal (struct value *arg1, struct value *arg2);
 759
 760 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 761
 762 extern int value_less (struct value *arg1, struct value *arg2);
 763
 764 extern int value_logical_not (struct value *arg1);
 765
 766 /* C++ */
 767
 768 extern struct value *value_of_this (const struct language_defn *lang);
 769
 770 extern struct value *value_of_this_silent (const struct language_defn *lang);
 771
 772 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 773                                     enum exp_opcode op,
 774                                     enum exp_opcode otherop,
 775                                     enum noside noside);
 776
 777 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 778                                    enum noside noside);
 779
 780 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 781                                      int j, struct type *type, int offset);
 782
 783 extern int binop_types_user_defined_p (enum exp_opcode op,
 784                                        struct type *type1,
 785                                        struct type *type2);
 786
 787 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 788                                  struct value *arg2);
 789
 790 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 791
 792 extern int destructor_name_p (const char *name, struct type *type);
 793
 794 extern void value_incref (struct value *val);
 795
 796 extern void value_free (struct value *val);
 797
 798 extern void free_all_values (void);
 799
 800 extern void free_value_chain (struct value *v);
 801
 802 extern void release_value (struct value *val);
 803
 804 extern void release_value_or_incref (struct value *val);
 805
 806 extern int record_latest_value (struct value *val);
 807
 808 extern void modify_field (struct type *type, gdb_byte *addr,
 809                           LONGEST fieldval, int bitpos, int bitsize);
 810
 811 extern void type_print (struct type *type, const char *varstring,
 812                         struct ui_file *stream, int show);
 813
 814 extern char *type_to_string (struct type *type);
 815
 816 extern gdb_byte *baseclass_addr (struct type *type, int index,
 817                                  gdb_byte *valaddr,
 818                                  struct value **valuep, int *errp);
 819
 820 extern void print_longest (struct ui_file *stream, int format,
 821                            int use_local, LONGEST val);
 822
 823 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 824                             struct ui_file *stream);
 825
 826 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 827                                     struct ui_file *stream);
 828
 829 extern void value_print (struct value *val, struct ui_file *stream,
 830                          const struct value_print_options *options);
 831
 832 extern void value_print_array_elements (struct value *val,
 833                                         struct ui_file *stream, int format,
 834                                         enum val_prettyprint pretty);
 835
 836 extern struct value *value_release_to_mark (struct value *mark);
 837
 838 extern void val_print (struct type *type, const gdb_byte *valaddr,
 839                        int embedded_offset, CORE_ADDR address,
 840                        struct ui_file *stream, int recurse,
 841                        const struct value *val,
 842                        const struct value_print_options *options,
 843                        const struct language_defn *language);
 844
 845 extern void common_val_print (struct value *val,
 846                               struct ui_file *stream, int recurse,
 847                               const struct value_print_options *options,
 848                               const struct language_defn *language);
 849
 850 extern int val_print_string (struct type *elttype, const char *encoding,
 851                              CORE_ADDR addr, int len,
 852                              struct ui_file *stream,
 853                              const struct value_print_options *options);
 854
 855 extern void print_variable_and_value (const char *name,
 856                                       struct symbol *var,
 857                                       struct frame_info *frame,
 858                                       struct ui_file *stream,
 859                                       int indent);
 860
 861 extern int check_field (struct type *, const char *);
 862
 863 extern void typedef_print (struct type *type, struct symbol *news,
 864                            struct ui_file *stream);
 865
 866 extern char *internalvar_name (struct internalvar *var);
 867
 868 extern void preserve_values (struct objfile *);
 869
 870 /* From values.c */
 871
 872 extern struct value *value_copy (struct value *);
 873
 874 extern struct value *value_non_lval (struct value *);
 875
 876 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 877
 878 /* From valops.c */
 879
 880 extern struct value *varying_to_slice (struct value *);
 881
 882 extern struct value *value_slice (struct value *, int, int);
 883
 884 extern struct value *value_literal_complex (struct value *, struct value *,
 885                                             struct type *);
 886
 887 extern struct value *find_function_in_inferior (const char *,
 888                                                 struct objfile **);
 889
 890 extern struct value *value_allocate_space_in_inferior (int);
 891
 892 extern struct value *value_subscripted_rvalue (struct value *array,
 893                                                LONGEST index, int lowerbound);
 894
 895 /* User function handler.  */
 896
 897 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 898                                                const struct language_defn *language,
 899                                                void *cookie,
 900                                                int argc,
 901                                                struct value **argv);
 902
 903 void add_internal_function (const char *name, const char *doc,
 904                             internal_function_fn handler,
 905                             void *cookie);
 906
 907 struct value *call_internal_function (struct gdbarch *gdbarch,
 908                                       const struct language_defn *language,
 909                                       struct value *function,
 910                                       int argc, struct value **argv);
 911
 912 char *value_internal_function_name (struct value *);
 913
 914 #endif /* !defined (VALUE_H) */