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