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 /* Like value_bytes_available, but return false if any byte in the
 372    whole object is unavailable.  */
 373 extern int value_entirely_available (struct value *value);
 374
 375 /* Mark VALUE's content bytes starting at OFFSET and extending for
 376    LENGTH bytes as unavailable.  */
 377
 378 extern void mark_value_bytes_unavailable (struct value *value,
 379                                           int offset, int length);
 380
 381 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 382    LENGTH bytes of VAL2's contents starting at OFFSET2.  Returns true
 383    iff the set of available contents match.  Unavailable contents
 384    compare equal with unavailable contents, and different with any
 385    available byte.  For example, if 'x's represent an unavailable
 386    byte, and 'V' and 'Z' represent different available bytes, in a
 387    value with length 16:
 388
 389    offset:   0   4   8   12  16
 390    contents: xxxxVVVVxxxxVVZZ
 391
 392    then:
 393
 394    value_available_contents_eq(val, 0, val, 8, 6) => 1
 395    value_available_contents_eq(val, 0, val, 4, 4) => 1
 396    value_available_contents_eq(val, 0, val, 8, 8) => 0
 397    value_available_contents_eq(val, 4, val, 12, 2) => 1
 398    value_available_contents_eq(val, 4, val, 12, 4) => 0
 399    value_available_contents_eq(val, 3, val, 4, 4) => 0
 400 */
 401
 402 extern int value_available_contents_eq (const struct value *val1, int offset1,
 403                                         const struct value *val2, int offset2,
 404                                         int length);
 405
 406 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 407    is (or will be copied to) VAL's contents buffer offset by
 408    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 409    Marks value contents ranges as unavailable if the corresponding
 410    memory is likewise unavailable.  STACK indicates whether the memory
 411    is known to be stack memory.  */
 412
 413 extern void read_value_memory (struct value *val, int embedded_offset,
 414                                int stack, CORE_ADDR memaddr,
 415                                gdb_byte *buffer, size_t length);
 416
 417 \f
 418
 419 #include "symtab.h"
 420 #include "gdbtypes.h"
 421 #include "expression.h"
 422
 423 struct frame_info;
 424 struct fn_field;
 425
 426 extern void print_address_demangle (struct gdbarch *, CORE_ADDR,
 427                                     struct ui_file *, int);
 428
 429 extern LONGEST value_as_long (struct value *val);
 430 extern DOUBLEST value_as_double (struct value *val);
 431 extern CORE_ADDR value_as_address (struct value *val);
 432
 433 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 434 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 435                                int *invp);
 436 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 437
 438 extern int unpack_value_bits_as_long (struct type *field_type,
 439                                       const gdb_byte *valaddr,
 440                                       int embedded_offset, int bitpos,
 441                                       int bitsize,
 442                                       const struct value *original_value,
 443                                       LONGEST *result);
 444
 445 extern LONGEST unpack_field_as_long (struct type *type,
 446                                      const gdb_byte *valaddr,
 447                                      int fieldno);
 448 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 449                                 int embedded_offset, int fieldno,
 450                                 const struct value *val, LONGEST *result);
 451
 452 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 453                                            const gdb_byte *valaddr,
 454                                            int embedded_offset,
 455                                            const struct value *val);
 456
 457 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 458
 459 extern struct value *value_from_longest (struct type *type, LONGEST num);
 460 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 461 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 462 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 463 extern struct value *value_from_decfloat (struct type *type,
 464                                           const gdb_byte *decbytes);
 465
 466 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 467 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 468
 469 extern struct value *value_from_contents_and_address (struct type *,
 470                                                       const gdb_byte *,
 471                                                       CORE_ADDR);
 472
 473 extern struct value *default_value_from_register (struct type *type,
 474                                                   int regnum,
 475                                                   struct frame_info *frame);
 476
 477 extern struct value *value_from_register (struct type *type, int regnum,
 478                                           struct frame_info *frame);
 479
 480 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 481                                         struct frame_info *frame);
 482
 483 extern struct value *value_of_variable (struct symbol *var, struct block *b);
 484
 485 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 486
 487 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 488
 489 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 490
 491 extern int symbol_read_needs_frame (struct symbol *);
 492
 493 extern struct value *read_var_value (struct symbol *var,
 494                                      struct frame_info *frame);
 495
 496 extern struct value *allocate_value (struct type *type);
 497 extern struct value *allocate_value_lazy (struct type *type);
 498 extern void allocate_value_contents (struct value *value);
 499 extern void value_contents_copy (struct value *dst, int dst_offset,
 500                                  struct value *src, int src_offset,
 501                                  int length);
 502 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 503                                      struct value *src, int src_offset,
 504                                      int length);
 505
 506 extern struct value *allocate_repeat_value (struct type *type, int count);
 507
 508 extern struct value *value_mark (void);
 509
 510 extern void value_free_to_mark (struct value *mark);
 511
 512 extern struct value *value_cstring (char *ptr, int len,
 513                                     struct type *char_type);
 514 extern struct value *value_string (char *ptr, int len,
 515                                    struct type *char_type);
 516 extern struct value *value_bitstring (char *ptr, int len,
 517                                       struct type *index_type);
 518
 519 extern struct value *value_array (int lowbound, int highbound,
 520                                   struct value **elemvec);
 521
 522 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 523
 524 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 525                                   enum exp_opcode op);
 526
 527 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 528
 529 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 530
 531 extern int value_must_coerce_to_target (struct value *arg1);
 532
 533 extern struct value *value_coerce_to_target (struct value *arg1);
 534
 535 extern struct value *value_coerce_array (struct value *arg1);
 536
 537 extern struct value *value_coerce_function (struct value *arg1);
 538
 539 extern struct value *value_ind (struct value *arg1);
 540
 541 extern struct value *value_addr (struct value *arg1);
 542
 543 extern struct value *value_ref (struct value *arg1);
 544
 545 extern struct value *value_assign (struct value *toval,
 546                                    struct value *fromval);
 547
 548 extern struct value *value_pos (struct value *arg1);
 549
 550 extern struct value *value_neg (struct value *arg1);
 551
 552 extern struct value *value_complement (struct value *arg1);
 553
 554 extern struct value *value_struct_elt (struct value **argp,
 555                                        struct value **args,
 556                                        const char *name, int *static_memfuncp,
 557                                        const char *err);
 558
 559 extern struct value *value_aggregate_elt (struct type *curtype,
 560                                           char *name,
 561                                           struct type *expect_type,
 562                                           int want_address,
 563                                           enum noside noside);
 564
 565 extern struct value *value_static_field (struct type *type, int fieldno);
 566
 567 extern struct fn_field *value_find_oload_method_list (struct value **,
 568                                                       const char *,
 569                                                       int, int *,
 570                                                       struct type **, int *);
 571
 572 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 573
 574 extern int find_overload_match (struct type **arg_types, int nargs,
 575                                 const char *name,
 576                                 enum oload_search_type method, int lax,
 577                                 struct value **objp, struct symbol *fsym,
 578                                 struct value **valp, struct symbol **symp,
 579                                 int *staticp, const int no_adl);
 580
 581 extern struct value *value_field (struct value *arg1, int fieldno);
 582
 583 extern struct value *value_primitive_field (struct value *arg1, int offset,
 584                                             int fieldno,
 585                                             struct type *arg_type);
 586
 587
 588 extern struct type *value_rtti_target_type (struct value *, int *, int *,
 589                                             int *);
 590
 591 extern struct value *value_full_object (struct value *, struct type *, int,
 592                                         int, int);
 593
 594 extern struct value *value_cast_pointers (struct type *, struct value *);
 595
 596 extern struct value *value_cast (struct type *type, struct value *arg2);
 597
 598 extern struct value *value_reinterpret_cast (struct type *type,
 599                                              struct value *arg);
 600
 601 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 602
 603 extern struct value *value_zero (struct type *type, enum lval_type lv);
 604
 605 extern struct value *value_one (struct type *type, enum lval_type lv);
 606
 607 extern struct value *value_repeat (struct value *arg1, int count);
 608
 609 extern struct value *value_subscript (struct value *array, LONGEST index);
 610
 611 extern struct value *value_bitstring_subscript (struct type *type,
 612                                                 struct value *bitstring,
 613                                                 LONGEST index);
 614
 615 extern struct value *register_value_being_returned (struct type *valtype,
 616                                                     struct regcache *retbuf);
 617
 618 extern int value_in (struct value *element, struct value *set);
 619
 620 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 621                             int index);
 622
 623 extern int using_struct_return (struct gdbarch *gdbarch,
 624                                 struct type *func_type,
 625                                 struct type *value_type);
 626
 627 extern struct value *evaluate_expression (struct expression *exp);
 628
 629 extern struct value *evaluate_type (struct expression *exp);
 630
 631 extern struct value *evaluate_subexp (struct type *expect_type,
 632                                       struct expression *exp,
 633                                       int *pos, enum noside noside);
 634
 635 extern struct value *evaluate_subexpression_type (struct expression *exp,
 636                                                   int subexp);
 637
 638 extern void fetch_subexp_value (struct expression *exp, int *pc,
 639                                 struct value **valp, struct value **resultp,
 640                                 struct value **val_chain);
 641
 642 extern char *extract_field_op (struct expression *exp, int *subexp);
 643
 644 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 645                                                     int *, enum noside);
 646
 647 extern struct value *parse_and_eval (char *exp);
 648
 649 extern struct value *parse_to_comma_and_eval (char **expp);
 650
 651 extern struct type *parse_and_eval_type (char *p, int length);
 652
 653 extern CORE_ADDR parse_and_eval_address (char *exp);
 654
 655 extern CORE_ADDR parse_and_eval_address_1 (char **expptr);
 656
 657 extern LONGEST parse_and_eval_long (char *exp);
 658
 659 extern void unop_promote (const struct language_defn *language,
 660                           struct gdbarch *gdbarch,
 661                           struct value **arg1);
 662
 663 extern void binop_promote (const struct language_defn *language,
 664                            struct gdbarch *gdbarch,
 665                            struct value **arg1, struct value **arg2);
 666
 667 extern struct value *access_value_history (int num);
 668
 669 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 670                                            struct internalvar *var);
 671
 672 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 673
 674 extern void set_internalvar (struct internalvar *var, struct value *val);
 675
 676 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 677
 678 extern void set_internalvar_string (struct internalvar *var,
 679                                     const char *string);
 680
 681 extern void clear_internalvar (struct internalvar *var);
 682
 683 extern void set_internalvar_component (struct internalvar *var,
 684                                        int offset,
 685                                        int bitpos, int bitsize,
 686                                        struct value *newvalue);
 687
 688 extern struct internalvar *lookup_only_internalvar (const char *name);
 689
 690 extern struct internalvar *create_internalvar (const char *name);
 691
 692 typedef struct value * (*internalvar_make_value) (struct gdbarch *,
 693                                                   struct internalvar *);
 694 extern struct internalvar *
 695   create_internalvar_type_lazy (char *name, internalvar_make_value fun);
 696
 697 extern struct internalvar *lookup_internalvar (const char *name);
 698
 699 extern int value_equal (struct value *arg1, struct value *arg2);
 700
 701 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 702
 703 extern int value_less (struct value *arg1, struct value *arg2);
 704
 705 extern int value_logical_not (struct value *arg1);
 706
 707 /* C++ */
 708
 709 extern struct value *value_of_this (int complain);
 710
 711 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 712                                     enum exp_opcode op,
 713                                     enum exp_opcode otherop,
 714                                     enum noside noside);
 715
 716 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 717                                    enum noside noside);
 718
 719 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 720                                      int j, struct type *type, int offset);
 721
 722 extern int binop_types_user_defined_p (enum exp_opcode op,
 723                                        struct type *type1,
 724                                        struct type *type2);
 725
 726 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 727                                  struct value *arg2);
 728
 729 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 730
 731 extern int destructor_name_p (const char *name, const struct type *type);
 732
 733 extern void value_incref (struct value *val);
 734
 735 extern void value_free (struct value *val);
 736
 737 extern void free_all_values (void);
 738
 739 extern void free_value_chain (struct value *v);
 740
 741 extern void release_value (struct value *val);
 742
 743 extern int record_latest_value (struct value *val);
 744
 745 extern void modify_field (struct type *type, gdb_byte *addr,
 746                           LONGEST fieldval, int bitpos, int bitsize);
 747
 748 extern void type_print (struct type *type, char *varstring,
 749                         struct ui_file *stream, int show);
 750
 751 extern char *type_to_string (struct type *type);
 752
 753 extern gdb_byte *baseclass_addr (struct type *type, int index,
 754                                  gdb_byte *valaddr,
 755                                  struct value **valuep, int *errp);
 756
 757 extern void print_longest (struct ui_file *stream, int format,
 758                            int use_local, LONGEST val);
 759
 760 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 761                             struct ui_file *stream);
 762
 763 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 764                                     struct ui_file *stream);
 765
 766 extern int value_print (struct value *val, struct ui_file *stream,
 767                         const struct value_print_options *options);
 768
 769 extern void value_print_array_elements (struct value *val,
 770                                         struct ui_file *stream, int format,
 771                                         enum val_prettyprint pretty);
 772
 773 extern struct value *value_release_to_mark (struct value *mark);
 774
 775 extern int val_print (struct type *type, const gdb_byte *valaddr,
 776                       int embedded_offset, CORE_ADDR address,
 777                       struct ui_file *stream, int recurse,
 778                       const struct value *val,
 779                       const struct value_print_options *options,
 780                       const struct language_defn *language);
 781
 782 extern int common_val_print (struct value *val,
 783                              struct ui_file *stream, int recurse,
 784                              const struct value_print_options *options,
 785                              const struct language_defn *language);
 786
 787 extern int val_print_string (struct type *elttype, const char *encoding,
 788                              CORE_ADDR addr, int len,
 789                              struct ui_file *stream,
 790                              const struct value_print_options *options);
 791
 792 extern void print_variable_and_value (const char *name,
 793                                       struct symbol *var,
 794                                       struct frame_info *frame,
 795                                       struct ui_file *stream,
 796                                       int indent);
 797
 798 extern int check_field (struct type *, const char *);
 799
 800 extern void typedef_print (struct type *type, struct symbol *news,
 801                            struct ui_file *stream);
 802
 803 extern char *internalvar_name (struct internalvar *var);
 804
 805 extern void preserve_values (struct objfile *);
 806
 807 /* From values.c */
 808
 809 extern struct value *value_copy (struct value *);
 810
 811 extern struct value *value_non_lval (struct value *);
 812
 813 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 814
 815 /* From valops.c */
 816
 817 extern struct value *varying_to_slice (struct value *);
 818
 819 extern struct value *value_slice (struct value *, int, int);
 820
 821 extern struct value *value_literal_complex (struct value *, struct value *,
 822                                             struct type *);
 823
 824 extern struct value *find_function_in_inferior (const char *,
 825                                                 struct objfile **);
 826
 827 extern struct value *value_allocate_space_in_inferior (int);
 828
 829 extern struct value *value_of_local (const char *name, int complain);
 830
 831 extern struct value *value_subscripted_rvalue (struct value *array,
 832                                                LONGEST index, int lowerbound);
 833
 834 /* User function handler.  */
 835
 836 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 837                                                const struct language_defn *language,
 838                                                void *cookie,
 839                                                int argc,
 840                                                struct value **argv);
 841
 842 void add_internal_function (const char *name, const char *doc,
 843                             internal_function_fn handler,
 844                             void *cookie);
 845
 846 struct value *call_internal_function (struct gdbarch *gdbarch,
 847                                       const struct language_defn *language,
 848                                       struct value *function,
 849                                       int argc, struct value **argv);
 850
 851 char *value_internal_function_name (struct value *);
 852
 853 #endif /* !defined (VALUE_H) */