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