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'.  */
 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'.  */
 166   void (*write) (struct value *toval, struct value *fromval);
 167
 168   /* Check the validity of some bits in VALUE.  This should return 1
 169      if all the bits starting at OFFSET and extending for LENGTH bits
 170      are valid, or 0 if any bit is invalid.  */
 171   int (*check_validity) (const struct value *value, int offset, int length);
 172
 173   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 174   int (*check_any_valid) (const struct value *value);
 175
 176   /* If non-NULL, this is used to implement pointer indirection for
 177      this value.  This method may return NULL, in which case value_ind
 178      will fall back to ordinary indirection.  */
 179   struct value *(*indirect) (struct value *value);
 180
 181   /* If non-NULL, this is used to determine whether the indicated bits
 182      of VALUE are a synthetic pointer.  */
 183   int (*check_synthetic_pointer) (const struct value *value,
 184                                   int offset, int length);
 185
 186   /* Return a duplicate of VALUE's closure, for use in a new value.
 187      This may simply return the same closure, if VALUE's is
 188      reference-counted or statically allocated.
 189
 190      This may be NULL, in which case VALUE's closure is re-used in the
 191      new value.  */
 192   void *(*copy_closure) (const struct value *v);
 193
 194   /* Drop VALUE's reference to its closure.  Maybe this frees the
 195      closure; maybe this decrements a reference count; maybe the
 196      closure is statically allocated and this does nothing.
 197
 198      This may be NULL, in which case no action is taken to free
 199      VALUE's closure.  */
 200   void (*free_closure) (struct value *v);
 201 };
 202
 203 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 204    and closure CLOSURE.  */
 205
 206 extern struct value *allocate_computed_value (struct type *type,
 207                                               struct lval_funcs *funcs,
 208                                               void *closure);
 209
 210 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 211
 212 extern struct lval_funcs *value_computed_funcs (struct value *value);
 213
 214 /* If VALUE is lval_computed, return its closure.  The meaning of the
 215    returned value depends on the functions VALUE uses.  */
 216
 217 extern void *value_computed_closure (const struct value *value);
 218
 219 /* If zero, contents of this value are in the contents field.  If
 220    nonzero, contents are in inferior.  If the lval field is lval_memory,
 221    the contents are in inferior memory at location.address plus offset.
 222    The lval field may also be lval_register.
 223
 224    WARNING: This field is used by the code which handles watchpoints
 225    (see breakpoint.c) to decide whether a particular value can be
 226    watched by hardware watchpoints.  If the lazy flag is set for some
 227    member of a value chain, it is assumed that this member of the
 228    chain doesn't need to be watched as part of watching the value
 229    itself.  This is how GDB avoids watching the entire struct or array
 230    when the user wants to watch a single struct member or array
 231    element.  If you ever change the way lazy flag is set and reset, be
 232    sure to consider this use as well!  */
 233
 234 extern int value_lazy (struct value *);
 235 extern void set_value_lazy (struct value *value, int val);
 236
 237 extern int value_stack (struct value *);
 238 extern void set_value_stack (struct value *value, int val);
 239
 240 /* value_contents() and value_contents_raw() both return the address
 241    of the gdb buffer used to hold a copy of the contents of the lval.
 242    value_contents() is used when the contents of the buffer are needed
 243    -- it uses value_fetch_lazy() to load the buffer from the process
 244    being debugged if it hasn't already been loaded
 245    (value_contents_writeable() is used when a writeable but fetched
 246    buffer is required)..  value_contents_raw() is used when data is
 247    being stored into the buffer, or when it is certain that the
 248    contents of the buffer are valid.
 249
 250    Note: The contents pointer is adjusted by the offset required to
 251    get to the real subobject, if the value happens to represent
 252    something embedded in a larger run-time object.  */
 253
 254 extern gdb_byte *value_contents_raw (struct value *);
 255
 256 /* Actual contents of the value.  For use of this value; setting it
 257    uses the stuff above.  Not valid if lazy is nonzero.  Target
 258    byte-order.  We force it to be aligned properly for any possible
 259    value.  Note that a value therefore extends beyond what is
 260    declared here.  */
 261
 262 extern const gdb_byte *value_contents (struct value *);
 263 extern gdb_byte *value_contents_writeable (struct value *);
 264
 265 /* The ALL variants of the above two macros do not adjust the returned
 266    pointer by the embedded_offset value.  */
 267
 268 extern gdb_byte *value_contents_all_raw (struct value *);
 269 extern const gdb_byte *value_contents_all (struct value *);
 270
 271 /* Like value_contents_all, but does not require that the returned
 272    bits be valid.  This should only be used in situations where you
 273    plan to check the validity manually.  */
 274 extern const gdb_byte *value_contents_for_printing (struct value *value);
 275
 276 /* Like value_contents_for_printing, but accepts a constant value
 277    pointer.  Unlike value_contents_for_printing however, the pointed
 278    value must _not_ be lazy.  */
 279 extern const gdb_byte *
 280   value_contents_for_printing_const (const struct value *value);
 281
 282 extern int value_fetch_lazy (struct value *val);
 283 extern int value_contents_equal (struct value *val1, struct value *val2);
 284
 285 /* If nonzero, this is the value of a variable which does not actually
 286    exist in the program.  */
 287 extern int value_optimized_out (struct value *value);
 288 extern void set_value_optimized_out (struct value *value, int val);
 289
 290 /* Like value_optimized_out, but return false if any bit in the object
 291    is valid.  */
 292 extern int value_entirely_optimized_out (const struct value *value);
 293
 294 /* Set or return field indicating whether a variable is initialized or
 295    not, based on debugging information supplied by the compiler.
 296    1 = initialized; 0 = uninitialized.  */
 297 extern int value_initialized (struct value *);
 298 extern void set_value_initialized (struct value *, int);
 299
 300 /* Set COMPONENT's location as appropriate for a component of WHOLE
 301    --- regardless of what kind of lvalue WHOLE is.  */
 302 extern void set_value_component_location (struct value *component,
 303                                           const struct value *whole);
 304
 305 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 306    single value might have multiple LVALs), this hacked interface is
 307    limited to just the first PIECE.  Expect further change.  */
 308 /* Type of value; either not an lval, or one of the various different
 309    possible kinds of lval.  */
 310 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 311 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 312
 313 /* If lval == lval_memory, return the address in the inferior.  If
 314    lval == lval_register, return the byte offset into the registers
 315    structure.  Otherwise, return 0.  The returned address
 316    includes the offset, if any.  */
 317 extern CORE_ADDR value_address (const struct value *);
 318
 319 /* Like value_address, except the result does not include value's
 320    offset.  */
 321 extern CORE_ADDR value_raw_address (struct value *);
 322
 323 /* Set the address of a value.  */
 324 extern void set_value_address (struct value *, CORE_ADDR);
 325
 326 /* Pointer to internal variable.  */
 327 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 328 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 329
 330 /* Frame register value is relative to.  This will be described in the
 331    lval enum above as "lval_register".  */
 332 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 333 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 334
 335 /* Register number if the value is from a register.  */
 336 extern short *deprecated_value_regnum_hack (struct value *);
 337 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 338
 339 /* Convert a REF to the object referenced.  */
 340
 341 extern struct value *coerce_ref (struct value *value);
 342
 343 /* If ARG is an array, convert it to a pointer.
 344    If ARG is a function, convert it to a function pointer.
 345
 346    References are dereferenced.  */
 347
 348 extern struct value *coerce_array (struct value *value);
 349
 350 /* Given a value, determine whether the bits starting at OFFSET and
 351    extending for LENGTH bits are valid.  This returns nonzero if all
 352    bits in the given range are valid, zero if any bit is invalid.  */
 353
 354 extern int value_bits_valid (const struct value *value,
 355                              int offset, int length);
 356
 357 /* Given a value, determine whether the bits starting at OFFSET and
 358    extending for LENGTH bits are a synthetic pointer.  */
 359
 360 extern int value_bits_synthetic_pointer (const struct value *value,
 361                                          int offset, int length);
 362
 363 /* Given a value, determine whether the contents bytes starting at
 364    OFFSET and extending for LENGTH bytes are available.  This returns
 365    nonzero if all bytes in the given range are available, zero if any
 366    byte is unavailable.  */
 367
 368 extern int value_bytes_available (const struct value *value,
 369                                   int offset, int length);
 370
 371 /* Mark VALUE's content bytes starting at OFFSET and extending for
 372    LENGTH bytes as unavailable.  */
 373
 374 extern void mark_value_bytes_unavailable (struct value *value,
 375                                           int offset, int length);
 376
 377 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 378    LENGTH bytes of VAL2's contents starting at OFFSET2.  Returns true
 379    iff the set of available contents match.  Unavailable contents
 380    compare equal with unavailable contents, and different with any
 381    available byte.  For example, if 'x's represent an unavailable
 382    byte, and 'V' and 'Z' represent different available bytes, in a
 383    value with length 16:
 384
 385    offset:   0   4   8   12  16
 386    contents: xxxxVVVVxxxxVVZZ
 387
 388    then:
 389
 390    value_available_contents_eq(val, 0, val, 8, 6) => 1
 391    value_available_contents_eq(val, 0, val, 4, 4) => 1
 392    value_available_contents_eq(val, 0, val, 8, 8) => 0
 393    value_available_contents_eq(val, 4, val, 12, 2) => 1
 394    value_available_contents_eq(val, 4, val, 12, 4) => 0
 395    value_available_contents_eq(val, 3, val, 4, 4) => 0
 396 */
 397
 398 extern int value_available_contents_eq (const struct value *val1, int offset1,
 399                                         const struct value *val2, int offset2,
 400                                         int length);
 401
 402 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 403    is (or will be copied to) VAL's contents buffer offset by
 404    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 405    Marks value contents ranges as unavailable if the corresponding
 406    memory is likewise unavailable.  STACK indicates whether the memory
 407    is known to be stack memory.  */
 408
 409 extern void read_value_memory (struct value *val, int offset,
 410                                int stack, CORE_ADDR memaddr,
 411                                gdb_byte *buffer, size_t length);
 412
 413 \f
 414
 415 #include "symtab.h"
 416 #include "gdbtypes.h"
 417 #include "expression.h"
 418
 419 struct frame_info;
 420 struct fn_field;
 421
 422 extern void print_address_demangle (struct gdbarch *, CORE_ADDR,
 423                                     struct ui_file *, int);
 424
 425 extern LONGEST value_as_long (struct value *val);
 426 extern DOUBLEST value_as_double (struct value *val);
 427 extern CORE_ADDR value_as_address (struct value *val);
 428
 429 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 430 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 431                                int *invp);
 432 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 433
 434 extern int unpack_value_bits_as_long (struct type *field_type,
 435                                       const gdb_byte *valaddr,
 436                                       int embedded_offset, int bitpos,
 437                                       int bitsize,
 438                                       const struct value *original_value,
 439                                       LONGEST *result);
 440
 441 extern LONGEST unpack_field_as_long (struct type *type,
 442                                      const gdb_byte *valaddr,
 443                                      int fieldno);
 444 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 445                                 int embedded_offset, int fieldno,
 446                                 const struct value *val, LONGEST *result);
 447
 448 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 449                                            const gdb_byte *valaddr,
 450                                            int embedded_offset,
 451                                            const struct value *val);
 452
 453 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 454
 455 extern struct value *value_from_longest (struct type *type, LONGEST num);
 456 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 457 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 458 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 459 extern struct value *value_from_decfloat (struct type *type,
 460                                           const gdb_byte *decbytes);
 461
 462 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 463 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 464
 465 extern struct value *value_from_contents_and_address (struct type *,
 466                                                       const gdb_byte *,
 467                                                       CORE_ADDR);
 468
 469 extern struct value *default_value_from_register (struct type *type,
 470                                                   int regnum,
 471                                                   struct frame_info *frame);
 472
 473 extern struct value *value_from_register (struct type *type, int regnum,
 474                                           struct frame_info *frame);
 475
 476 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 477                                         struct frame_info *frame);
 478
 479 extern struct value *value_of_variable (struct symbol *var, struct block *b);
 480
 481 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 482
 483 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 484
 485 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 486
 487 extern int symbol_read_needs_frame (struct symbol *);
 488
 489 extern struct value *read_var_value (struct symbol *var,
 490                                      struct frame_info *frame);
 491
 492 extern struct value *allocate_value (struct type *type);
 493 extern struct value *allocate_value_lazy (struct type *type);
 494 extern void allocate_value_contents (struct value *value);
 495 extern void value_contents_copy (struct value *dst, int dst_offset,
 496                                  struct value *src, int src_offset,
 497                                  int length);
 498 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 499                                      struct value *src, int src_offset,
 500                                      int length);
 501
 502 extern struct value *allocate_repeat_value (struct type *type, int count);
 503
 504 extern struct value *value_mark (void);
 505
 506 extern void value_free_to_mark (struct value *mark);
 507
 508 extern struct value *value_cstring (char *ptr, int len,
 509                                     struct type *char_type);
 510 extern struct value *value_string (char *ptr, int len,
 511                                    struct type *char_type);
 512 extern struct value *value_bitstring (char *ptr, int len,
 513                                       struct type *index_type);
 514
 515 extern struct value *value_array (int lowbound, int highbound,
 516                                   struct value **elemvec);
 517
 518 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 519
 520 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 521                                   enum exp_opcode op);
 522
 523 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 524
 525 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 526
 527 extern int value_must_coerce_to_target (struct value *arg1);
 528
 529 extern struct value *value_coerce_to_target (struct value *arg1);
 530
 531 extern struct value *value_coerce_array (struct value *arg1);
 532
 533 extern struct value *value_coerce_function (struct value *arg1);
 534
 535 extern struct value *value_ind (struct value *arg1);
 536
 537 extern struct value *value_addr (struct value *arg1);
 538
 539 extern struct value *value_ref (struct value *arg1);
 540
 541 extern struct value *value_assign (struct value *toval,
 542                                    struct value *fromval);
 543
 544 extern struct value *value_pos (struct value *arg1);
 545
 546 extern struct value *value_neg (struct value *arg1);
 547
 548 extern struct value *value_complement (struct value *arg1);
 549
 550 extern struct value *value_struct_elt (struct value **argp,
 551                                        struct value **args,
 552                                        const char *name, int *static_memfuncp,
 553                                        const char *err);
 554
 555 extern struct value *value_aggregate_elt (struct type *curtype,
 556                                           char *name,
 557                                           struct type *expect_type,
 558                                           int want_address,
 559                                           enum noside noside);
 560
 561 extern struct value *value_static_field (struct type *type, int fieldno);
 562
 563 extern struct fn_field *value_find_oload_method_list (struct value **,
 564                                                       const char *,
 565                                                       int, int *,
 566                                                       struct type **, int *);
 567
 568 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 569
 570 extern int find_overload_match (struct type **arg_types, int nargs,
 571                                 const char *name,
 572                                 enum oload_search_type method, int lax,
 573                                 struct value **objp, struct symbol *fsym,
 574                                 struct value **valp, struct symbol **symp,
 575                                 int *staticp, const int no_adl);
 576
 577 extern struct value *value_field (struct value *arg1, int fieldno);
 578
 579 extern struct value *value_primitive_field (struct value *arg1, int offset,
 580                                             int fieldno,
 581                                             struct type *arg_type);
 582
 583
 584 extern struct type *value_rtti_target_type (struct value *, int *, int *,
 585                                             int *);
 586
 587 extern struct value *value_full_object (struct value *, struct type *, int,
 588                                         int, int);
 589
 590 extern struct value *value_cast_pointers (struct type *, struct value *);
 591
 592 extern struct value *value_cast (struct type *type, struct value *arg2);
 593
 594 extern struct value *value_reinterpret_cast (struct type *type,
 595                                              struct value *arg);
 596
 597 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 598
 599 extern struct value *value_zero (struct type *type, enum lval_type lv);
 600
 601 extern struct value *value_one (struct type *type, enum lval_type lv);
 602
 603 extern struct value *value_repeat (struct value *arg1, int count);
 604
 605 extern struct value *value_subscript (struct value *array, LONGEST index);
 606
 607 extern struct value *value_bitstring_subscript (struct type *type,
 608                                                 struct value *bitstring,
 609                                                 LONGEST index);
 610
 611 extern struct value *register_value_being_returned (struct type *valtype,
 612                                                     struct regcache *retbuf);
 613
 614 extern int value_in (struct value *element, struct value *set);
 615
 616 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 617                             int index);
 618
 619 extern int using_struct_return (struct gdbarch *gdbarch,
 620                                 struct type *func_type,
 621                                 struct type *value_type);
 622
 623 extern struct value *evaluate_expression (struct expression *exp);
 624
 625 extern struct value *evaluate_type (struct expression *exp);
 626
 627 extern struct value *evaluate_subexp (struct type *expect_type,
 628                                       struct expression *exp,
 629                                       int *pos, enum noside noside);
 630
 631 extern struct value *evaluate_subexpression_type (struct expression *exp,
 632                                                   int subexp);
 633
 634 extern void fetch_subexp_value (struct expression *exp, int *pc,
 635                                 struct value **valp, struct value **resultp,
 636                                 struct value **val_chain);
 637
 638 extern char *extract_field_op (struct expression *exp, int *subexp);
 639
 640 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 641                                                     int *, enum noside);
 642
 643 extern struct value *parse_and_eval (char *exp);
 644
 645 extern struct value *parse_to_comma_and_eval (char **expp);
 646
 647 extern struct type *parse_and_eval_type (char *p, int length);
 648
 649 extern CORE_ADDR parse_and_eval_address (char *exp);
 650
 651 extern CORE_ADDR parse_and_eval_address_1 (char **expptr);
 652
 653 extern LONGEST parse_and_eval_long (char *exp);
 654
 655 extern void unop_promote (const struct language_defn *language,
 656                           struct gdbarch *gdbarch,
 657                           struct value **arg1);
 658
 659 extern void binop_promote (const struct language_defn *language,
 660                            struct gdbarch *gdbarch,
 661                            struct value **arg1, struct value **arg2);
 662
 663 extern struct value *access_value_history (int num);
 664
 665 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 666                                            struct internalvar *var);
 667
 668 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 669
 670 extern void set_internalvar (struct internalvar *var, struct value *val);
 671
 672 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 673
 674 extern void set_internalvar_string (struct internalvar *var,
 675                                     const char *string);
 676
 677 extern void clear_internalvar (struct internalvar *var);
 678
 679 extern void set_internalvar_component (struct internalvar *var,
 680                                        int offset,
 681                                        int bitpos, int bitsize,
 682                                        struct value *newvalue);
 683
 684 extern struct internalvar *lookup_only_internalvar (const char *name);
 685
 686 extern struct internalvar *create_internalvar (const char *name);
 687
 688 typedef struct value * (*internalvar_make_value) (struct gdbarch *,
 689                                                   struct internalvar *);
 690 extern struct internalvar *
 691   create_internalvar_type_lazy (char *name, internalvar_make_value fun);
 692
 693 extern struct internalvar *lookup_internalvar (const char *name);
 694
 695 extern int value_equal (struct value *arg1, struct value *arg2);
 696
 697 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 698
 699 extern int value_less (struct value *arg1, struct value *arg2);
 700
 701 extern int value_logical_not (struct value *arg1);
 702
 703 /* C++ */
 704
 705 extern struct value *value_of_this (int complain);
 706
 707 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 708                                     enum exp_opcode op,
 709                                     enum exp_opcode otherop,
 710                                     enum noside noside);
 711
 712 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 713                                    enum noside noside);
 714
 715 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 716                                      int j, struct type *type, int offset);
 717
 718 extern int binop_types_user_defined_p (enum exp_opcode op,
 719                                        struct type *type1,
 720                                        struct type *type2);
 721
 722 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 723                                  struct value *arg2);
 724
 725 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 726
 727 extern int destructor_name_p (const char *name, const struct type *type);
 728
 729 extern void value_incref (struct value *val);
 730
 731 extern void value_free (struct value *val);
 732
 733 extern void free_all_values (void);
 734
 735 extern void free_value_chain (struct value *v);
 736
 737 extern void release_value (struct value *val);
 738
 739 extern int record_latest_value (struct value *val);
 740
 741 extern void modify_field (struct type *type, gdb_byte *addr,
 742                           LONGEST fieldval, int bitpos, int bitsize);
 743
 744 extern void type_print (struct type *type, char *varstring,
 745                         struct ui_file *stream, int show);
 746
 747 extern char *type_to_string (struct type *type);
 748
 749 extern gdb_byte *baseclass_addr (struct type *type, int index,
 750                                  gdb_byte *valaddr,
 751                                  struct value **valuep, int *errp);
 752
 753 extern void print_longest (struct ui_file *stream, int format,
 754                            int use_local, LONGEST val);
 755
 756 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 757                             struct ui_file *stream);
 758
 759 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 760                                     struct ui_file *stream);
 761
 762 extern int value_print (struct value *val, struct ui_file *stream,
 763                         const struct value_print_options *options);
 764
 765 extern void value_print_array_elements (struct value *val,
 766                                         struct ui_file *stream, int format,
 767                                         enum val_prettyprint pretty);
 768
 769 extern struct value *value_release_to_mark (struct value *mark);
 770
 771 extern int val_print (struct type *type, const gdb_byte *valaddr,
 772                       int embedded_offset, CORE_ADDR address,
 773                       struct ui_file *stream, int recurse,
 774                       const struct value *val,
 775                       const struct value_print_options *options,
 776                       const struct language_defn *language);
 777
 778 extern int common_val_print (struct value *val,
 779                              struct ui_file *stream, int recurse,
 780                              const struct value_print_options *options,
 781                              const struct language_defn *language);
 782
 783 extern int val_print_string (struct type *elttype, const char *encoding,
 784                              CORE_ADDR addr, int len,
 785                              struct ui_file *stream,
 786                              const struct value_print_options *options);
 787
 788 extern void print_variable_and_value (const char *name,
 789                                       struct symbol *var,
 790                                       struct frame_info *frame,
 791                                       struct ui_file *stream,
 792                                       int indent);
 793
 794 extern int check_field (struct type *, const char *);
 795
 796 extern void typedef_print (struct type *type, struct symbol *news,
 797                            struct ui_file *stream);
 798
 799 extern char *internalvar_name (struct internalvar *var);
 800
 801 extern void preserve_values (struct objfile *);
 802
 803 /* From values.c */
 804
 805 extern struct value *value_copy (struct value *);
 806
 807 extern struct value *value_non_lval (struct value *);
 808
 809 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 810
 811 /* From valops.c */
 812
 813 extern struct value *varying_to_slice (struct value *);
 814
 815 extern struct value *value_slice (struct value *, int, int);
 816
 817 extern struct value *value_literal_complex (struct value *, struct value *,
 818                                             struct type *);
 819
 820 extern struct value *find_function_in_inferior (const char *,
 821                                                 struct objfile **);
 822
 823 extern struct value *value_allocate_space_in_inferior (int);
 824
 825 extern struct value *value_of_local (const char *name, int complain);
 826
 827 extern struct value *value_subscripted_rvalue (struct value *array,
 828                                                LONGEST index, int lowerbound);
 829
 830 /* User function handler.  */
 831
 832 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 833                                                const struct language_defn *language,
 834                                                void *cookie,
 835                                                int argc,
 836                                                struct value **argv);
 837
 838 void add_internal_function (const char *name, const char *doc,
 839                             internal_function_fn handler,
 840                             void *cookie);
 841
 842 struct value *call_internal_function (struct gdbarch *gdbarch,
 843                                       const struct language_defn *language,
 844                                       struct value *function,
 845                                       int argc, struct value **argv);
 846
 847 char *value_internal_function_name (struct value *);
 848
 849 #endif /* !defined (VALUE_H) */