gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986-2012 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #if !defined (VALUE_H)
  21 #define VALUE_H 1
  22
  23 #include "doublest.h"
  24 #include "frame.h"              /* For struct frame_id.  */
  25
  26 struct block;
  27 struct expression;
  28 struct regcache;
  29 struct symbol;
  30 struct type;
  31 struct ui_file;
  32 struct language_defn;
  33 struct value_print_options;
  34
  35 /* The structure which defines the type of a value.  It should never
  36    be possible for a program lval value to survive over a call to the
  37    inferior (i.e. to be put into the history list or an internal
  38    variable).  */
  39
  40 struct value;
  41
  42 /* Values are stored in a chain, so that they can be deleted easily
  43    over calls to the inferior.  Values assigned to internal variables,
  44    put into the value history or exposed to Python are taken off this
  45    list.  */
  46
  47 struct value *value_next (struct value *);
  48
  49 /* Type of the value.  */
  50
  51 extern struct type *value_type (const struct value *);
  52
  53 /* This is being used to change the type of an existing value, that
  54    code should instead be creating a new value with the changed type
  55    (but possibly shared content).  */
  56
  57 extern void deprecated_set_value_type (struct value *value,
  58                                        struct type *type);
  59
  60 /* Only used for bitfields; number of bits contained in them.  */
  61
  62 extern int value_bitsize (const struct value *);
  63 extern void set_value_bitsize (struct value *, int bit);
  64
  65 /* Only used for bitfields; position of start of field.  For
  66    gdbarch_bits_big_endian=0 targets, it is the position of the LSB.  For
  67    gdbarch_bits_big_endian=1 targets, it is the position of the MSB.  */
  68
  69 extern int value_bitpos (const struct value *);
  70 extern void set_value_bitpos (struct value *, int bit);
  71
  72 /* Only used for bitfields; the containing value.  This allows a
  73    single read from the target when displaying multiple
  74    bitfields.  */
  75
  76 struct value *value_parent (struct value *);
  77 extern void set_value_parent (struct value *value, struct value *parent);
  78
  79 /* Describes offset of a value within lval of a structure in bytes.
  80    If lval == lval_memory, this is an offset to the address.  If lval
  81    == lval_register, this is a further offset from location.address
  82    within the registers structure.  Note also the member
  83    embedded_offset below.  */
  84
  85 extern int value_offset (const struct value *);
  86 extern void set_value_offset (struct value *, int offset);
  87
  88 /* The comment from "struct value" reads: ``Is it modifiable?  Only
  89    relevant if lval != not_lval.''.  Shouldn't the value instead be
  90    not_lval and be done with it?  */
  91
  92 extern int deprecated_value_modifiable (struct value *value);
  93 extern void deprecated_set_value_modifiable (struct value *value,
  94                                              int modifiable);
  95
  96 /* If a value represents a C++ object, then the `type' field gives the
  97    object's compile-time type.  If the object actually belongs to some
  98    class derived from `type', perhaps with other base classes and
  99    additional members, then `type' is just a subobject of the real
 100    thing, and the full object is probably larger than `type' would
 101    suggest.
 102
 103    If `type' is a dynamic class (i.e. one with a vtable), then GDB can
 104    actually determine the object's run-time type by looking at the
 105    run-time type information in the vtable.  When this information is
 106    available, we may elect to read in the entire object, for several
 107    reasons:
 108
 109    - When printing the value, the user would probably rather see the
 110      full object, not just the limited portion apparent from the
 111      compile-time type.
 112
 113    - If `type' has virtual base classes, then even printing `type'
 114      alone may require reaching outside the `type' portion of the
 115      object to wherever the virtual base class has been stored.
 116
 117    When we store the entire object, `enclosing_type' is the run-time
 118    type -- the complete object -- and `embedded_offset' is the offset
 119    of `type' within that larger type, in bytes.  The value_contents()
 120    macro takes `embedded_offset' into account, so most GDB code
 121    continues to see the `type' portion of the value, just as the
 122    inferior would.
 123
 124    If `type' is a pointer to an object, then `enclosing_type' is a
 125    pointer to the object's run-time type, and `pointed_to_offset' is
 126    the offset in bytes from the full object to the pointed-to object
 127    -- that is, the value `embedded_offset' would have if we followed
 128    the pointer and fetched the complete object.  (I don't really see
 129    the point.  Why not just determine the run-time type when you
 130    indirect, and avoid the special case?  The contents don't matter
 131    until you indirect anyway.)
 132
 133    If we're not doing anything fancy, `enclosing_type' is equal to
 134    `type', and `embedded_offset' is zero, so everything works
 135    normally.  */
 136
 137 extern struct type *value_enclosing_type (struct value *);
 138 extern void set_value_enclosing_type (struct value *val,
 139                                       struct type *new_type);
 140
 141 /* Returns value_type or value_enclosing_type depending on
 142    value_print_options.objectprint.
 143
 144    If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
 145    only for pointers and references, else it will be returned
 146    for all the types (e.g. structures).  This option is useful
 147    to prevent retrieving enclosing type for the base classes fields.
 148
 149    REAL_TYPE_FOUND is used to inform whether the real type was found
 150    (or just static type was used).  The NULL may be passed if it is not
 151    necessary. */
 152
 153 extern struct type *value_actual_type (struct value *value,
 154                                        int resolve_simple_types,
 155                                        int *real_type_found);
 156
 157 extern int value_pointed_to_offset (struct value *value);
 158 extern void set_value_pointed_to_offset (struct value *value, int val);
 159 extern int value_embedded_offset (struct value *value);
 160 extern void set_value_embedded_offset (struct value *value, int val);
 161
 162 /* For lval_computed values, this structure holds functions used to
 163    retrieve and set the value (or portions of the value).
 164
 165    For each function, 'V' is the 'this' pointer: an lval_funcs
 166    function F may always assume that the V it receives is an
 167    lval_computed value, and has F in the appropriate slot of its
 168    lval_funcs structure.  */
 169
 170 struct lval_funcs
 171 {
 172   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
 173      a problem arises in obtaining VALUE's bits, this function should
 174      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
 175      non-optimized-out value is an internal error.  */
 176   void (*read) (struct value *v);
 177
 178   /* Handle an assignment TOVAL = FROMVAL by writing the value of
 179      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
 180      been updated.  If a problem arises in doing so, this function
 181      should call 'error'.  If it is NULL such TOVAL assignment is an error as
 182      TOVAL is not considered as an lvalue.  */
 183   void (*write) (struct value *toval, struct value *fromval);
 184
 185   /* Check the validity of some bits in VALUE.  This should return 1
 186      if all the bits starting at OFFSET and extending for LENGTH bits
 187      are valid, or 0 if any bit is invalid.  */
 188   int (*check_validity) (const struct value *value, int offset, int length);
 189
 190   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 191   int (*check_any_valid) (const struct value *value);
 192
 193   /* If non-NULL, this is used to implement pointer indirection for
 194      this value.  This method may return NULL, in which case value_ind
 195      will fall back to ordinary indirection.  */
 196   struct value *(*indirect) (struct value *value);
 197
 198   /* If non-NULL, this is used to implement reference resolving for
 199      this value.  This method may return NULL, in which case coerce_ref
 200      will fall back to ordinary references resolving.  */
 201   struct value *(*coerce_ref) (const struct value *value);
 202
 203   /* If non-NULL, this is used to determine whether the indicated bits
 204      of VALUE are a synthetic pointer.  */
 205   int (*check_synthetic_pointer) (const struct value *value,
 206                                   int offset, int length);
 207
 208   /* Return a duplicate of VALUE's closure, for use in a new value.
 209      This may simply return the same closure, if VALUE's is
 210      reference-counted or statically allocated.
 211
 212      This may be NULL, in which case VALUE's closure is re-used in the
 213      new value.  */
 214   void *(*copy_closure) (const struct value *v);
 215
 216   /* Drop VALUE's reference to its closure.  Maybe this frees the
 217      closure; maybe this decrements a reference count; maybe the
 218      closure is statically allocated and this does nothing.
 219
 220      This may be NULL, in which case no action is taken to free
 221      VALUE's closure.  */
 222   void (*free_closure) (struct value *v);
 223 };
 224
 225 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 226    and closure CLOSURE.  */
 227
 228 extern struct value *allocate_computed_value (struct type *type,
 229                                               const struct lval_funcs *funcs,
 230                                               void *closure);
 231
 232 /* Helper function to check the validity of some bits of a value.
 233
 234    If TYPE represents some aggregate type (e.g., a structure), return 1.
 235
 236    Otherwise, any of the bytes starting at OFFSET and extending for
 237    TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
 238    return 0.  The checking is done using FUNCS.
 239
 240    Otherwise, return 1.  */
 241
 242 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
 243                                     int embedded_offset,
 244                                     const struct value *val);
 245
 246 extern struct value *allocate_optimized_out_value (struct type *type);
 247
 248 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 249
 250 extern const struct lval_funcs *value_computed_funcs (const struct value *);
 251
 252 /* If VALUE is lval_computed, return its closure.  The meaning of the
 253    returned value depends on the functions VALUE uses.  */
 254
 255 extern void *value_computed_closure (const struct value *value);
 256
 257 /* If zero, contents of this value are in the contents field.  If
 258    nonzero, contents are in inferior.  If the lval field is lval_memory,
 259    the contents are in inferior memory at location.address plus offset.
 260    The lval field may also be lval_register.
 261
 262    WARNING: This field is used by the code which handles watchpoints
 263    (see breakpoint.c) to decide whether a particular value can be
 264    watched by hardware watchpoints.  If the lazy flag is set for some
 265    member of a value chain, it is assumed that this member of the
 266    chain doesn't need to be watched as part of watching the value
 267    itself.  This is how GDB avoids watching the entire struct or array
 268    when the user wants to watch a single struct member or array
 269    element.  If you ever change the way lazy flag is set and reset, be
 270    sure to consider this use as well!  */
 271
 272 extern int value_lazy (struct value *);
 273 extern void set_value_lazy (struct value *value, int val);
 274
 275 extern int value_stack (struct value *);
 276 extern void set_value_stack (struct value *value, int val);
 277
 278 /* value_contents() and value_contents_raw() both return the address
 279    of the gdb buffer used to hold a copy of the contents of the lval.
 280    value_contents() is used when the contents of the buffer are needed
 281    -- it uses value_fetch_lazy() to load the buffer from the process
 282    being debugged if it hasn't already been loaded
 283    (value_contents_writeable() is used when a writeable but fetched
 284    buffer is required)..  value_contents_raw() is used when data is
 285    being stored into the buffer, or when it is certain that the
 286    contents of the buffer are valid.
 287
 288    Note: The contents pointer is adjusted by the offset required to
 289    get to the real subobject, if the value happens to represent
 290    something embedded in a larger run-time object.  */
 291
 292 extern gdb_byte *value_contents_raw (struct value *);
 293
 294 /* Actual contents of the value.  For use of this value; setting it
 295    uses the stuff above.  Not valid if lazy is nonzero.  Target
 296    byte-order.  We force it to be aligned properly for any possible
 297    value.  Note that a value therefore extends beyond what is
 298    declared here.  */
 299
 300 extern const gdb_byte *value_contents (struct value *);
 301 extern gdb_byte *value_contents_writeable (struct value *);
 302
 303 /* The ALL variants of the above two macros do not adjust the returned
 304    pointer by the embedded_offset value.  */
 305
 306 extern gdb_byte *value_contents_all_raw (struct value *);
 307 extern const gdb_byte *value_contents_all (struct value *);
 308
 309 /* Like value_contents_all, but does not require that the returned
 310    bits be valid.  This should only be used in situations where you
 311    plan to check the validity manually.  */
 312 extern const gdb_byte *value_contents_for_printing (struct value *value);
 313
 314 /* Like value_contents_for_printing, but accepts a constant value
 315    pointer.  Unlike value_contents_for_printing however, the pointed
 316    value must _not_ be lazy.  */
 317 extern const gdb_byte *
 318   value_contents_for_printing_const (const struct value *value);
 319
 320 extern int value_fetch_lazy (struct value *val);
 321 extern int value_contents_equal (struct value *val1, struct value *val2);
 322
 323 /* If nonzero, this is the value of a variable which does not actually
 324    exist in the program.  */
 325 extern int value_optimized_out (struct value *value);
 326 extern void set_value_optimized_out (struct value *value, int val);
 327
 328 /* Like value_optimized_out, but return false if any bit in the object
 329    is valid.  */
 330 extern int value_entirely_optimized_out (const struct value *value);
 331
 332 /* Set or return field indicating whether a variable is initialized or
 333    not, based on debugging information supplied by the compiler.
 334    1 = initialized; 0 = uninitialized.  */
 335 extern int value_initialized (struct value *);
 336 extern void set_value_initialized (struct value *, int);
 337
 338 /* Set COMPONENT's location as appropriate for a component of WHOLE
 339    --- regardless of what kind of lvalue WHOLE is.  */
 340 extern void set_value_component_location (struct value *component,
 341                                           const struct value *whole);
 342
 343 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 344    single value might have multiple LVALs), this hacked interface is
 345    limited to just the first PIECE.  Expect further change.  */
 346 /* Type of value; either not an lval, or one of the various different
 347    possible kinds of lval.  */
 348 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 349 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 350
 351 /* Like VALUE_LVAL, except the parameter can be const.  */
 352 extern enum lval_type value_lval_const (const struct value *value);
 353
 354 /* If lval == lval_memory, return the address in the inferior.  If
 355    lval == lval_register, return the byte offset into the registers
 356    structure.  Otherwise, return 0.  The returned address
 357    includes the offset, if any.  */
 358 extern CORE_ADDR value_address (const struct value *);
 359
 360 /* Like value_address, except the result does not include value's
 361    offset.  */
 362 extern CORE_ADDR value_raw_address (struct value *);
 363
 364 /* Set the address of a value.  */
 365 extern void set_value_address (struct value *, CORE_ADDR);
 366
 367 /* Pointer to internal variable.  */
 368 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 369 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 370
 371 /* Frame register value is relative to.  This will be described in the
 372    lval enum above as "lval_register".  */
 373 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 374 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 375
 376 /* Register number if the value is from a register.  */
 377 extern short *deprecated_value_regnum_hack (struct value *);
 378 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 379
 380 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
 381    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
 382
 383 extern struct value *coerce_ref_if_computed (const struct value *arg);
 384
 385 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
 386    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
 387    ORIGINAL_VAL are the type and value of the original reference or pointer.
 388
 389    Note, that VALUE is modified by this function.
 390
 391    It is a common implementation for coerce_ref and value_ind.  */
 392
 393 extern struct value * readjust_indirect_value_type (struct value *value,
 394                                                     struct type *enc_type,
 395                                                     struct type *original_type,
 396                                                     struct value *original_val);
 397
 398 /* Convert a REF to the object referenced.  */
 399
 400 extern struct value *coerce_ref (struct value *value);
 401
 402 /* If ARG is an array, convert it to a pointer.
 403    If ARG is a function, convert it to a function pointer.
 404
 405    References are dereferenced.  */
 406
 407 extern struct value *coerce_array (struct value *value);
 408
 409 /* Given a value, determine whether the bits starting at OFFSET and
 410    extending for LENGTH bits are valid.  This returns nonzero if all
 411    bits in the given range are valid, zero if any bit is invalid.  */
 412
 413 extern int value_bits_valid (const struct value *value,
 414                              int offset, int length);
 415
 416 /* Given a value, determine whether the bits starting at OFFSET and
 417    extending for LENGTH bits are a synthetic pointer.  */
 418
 419 extern int value_bits_synthetic_pointer (const struct value *value,
 420                                          int offset, int length);
 421
 422 /* Given a value, determine whether the contents bytes starting at
 423    OFFSET and extending for LENGTH bytes are available.  This returns
 424    nonzero if all bytes in the given range are available, zero if any
 425    byte is unavailable.  */
 426
 427 extern int value_bytes_available (const struct value *value,
 428                                   int offset, int length);
 429
 430 /* Like value_bytes_available, but return false if any byte in the
 431    whole object is unavailable.  */
 432 extern int value_entirely_available (struct value *value);
 433
 434 /* Mark VALUE's content bytes starting at OFFSET and extending for
 435    LENGTH bytes as unavailable.  */
 436
 437 extern void mark_value_bytes_unavailable (struct value *value,
 438                                           int offset, int length);
 439
 440 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 441    LENGTH bytes of VAL2's contents starting at OFFSET2.
 442
 443    Note that "contents" refers to the whole value's contents
 444    (value_contents_all), without any embedded offset adjustment.  For
 445    example, to compare a complete object value with itself, including
 446    its enclosing type chunk, you'd do:
 447
 448      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 449      value_available_contents (val, 0, val, 0, len);
 450
 451    Returns true iff the set of available contents match.  Unavailable
 452    contents compare equal with unavailable contents, and different
 453    with any available byte.  For example, if 'x's represent an
 454    unavailable byte, and 'V' and 'Z' represent different available
 455    bytes, in a value with length 16:
 456
 457    offset:   0   4   8   12  16
 458    contents: xxxxVVVVxxxxVVZZ
 459
 460    then:
 461
 462    value_available_contents_eq(val, 0, val, 8, 6) => 1
 463    value_available_contents_eq(val, 0, val, 4, 4) => 1
 464    value_available_contents_eq(val, 0, val, 8, 8) => 0
 465    value_available_contents_eq(val, 4, val, 12, 2) => 1
 466    value_available_contents_eq(val, 4, val, 12, 4) => 0
 467    value_available_contents_eq(val, 3, val, 4, 4) => 0
 468 */
 469
 470 extern int value_available_contents_eq (const struct value *val1, int offset1,
 471                                         const struct value *val2, int offset2,
 472                                         int length);
 473
 474 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 475    is (or will be copied to) VAL's contents buffer offset by
 476    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 477    Marks value contents ranges as unavailable if the corresponding
 478    memory is likewise unavailable.  STACK indicates whether the memory
 479    is known to be stack memory.  */
 480
 481 extern void read_value_memory (struct value *val, int embedded_offset,
 482                                int stack, CORE_ADDR memaddr,
 483                                gdb_byte *buffer, size_t length);
 484
 485 \f
 486
 487 #include "symtab.h"
 488 #include "gdbtypes.h"
 489 #include "expression.h"
 490
 491 struct frame_info;
 492 struct fn_field;
 493
 494 extern void print_address_demangle (const struct value_print_options *,
 495                                     struct gdbarch *, CORE_ADDR,
 496                                     struct ui_file *, int);
 497
 498 extern LONGEST value_as_long (struct value *val);
 499 extern DOUBLEST value_as_double (struct value *val);
 500 extern CORE_ADDR value_as_address (struct value *val);
 501
 502 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 503 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 504                                int *invp);
 505 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 506
 507 extern int unpack_value_bits_as_long (struct type *field_type,
 508                                       const gdb_byte *valaddr,
 509                                       int embedded_offset, int bitpos,
 510                                       int bitsize,
 511                                       const struct value *original_value,
 512                                       LONGEST *result);
 513
 514 extern LONGEST unpack_field_as_long (struct type *type,
 515                                      const gdb_byte *valaddr,
 516                                      int fieldno);
 517 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 518                                 int embedded_offset, int fieldno,
 519                                 const struct value *val, LONGEST *result);
 520
 521 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 522                                            const gdb_byte *valaddr,
 523                                            int embedded_offset,
 524                                            const struct value *val);
 525
 526 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 527
 528 extern struct value *value_from_longest (struct type *type, LONGEST num);
 529 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 530 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 531 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 532 extern struct value *value_from_decfloat (struct type *type,
 533                                           const gdb_byte *decbytes);
 534 extern struct value *value_from_history_ref (char *, char **);
 535
 536 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 537 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 538
 539 extern struct value *value_from_contents_and_address (struct type *,
 540                                                       const gdb_byte *,
 541                                                       CORE_ADDR);
 542 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 543
 544 extern struct value *default_value_from_register (struct type *type,
 545                                                   int regnum,
 546                                                   struct frame_info *frame);
 547
 548 extern void read_frame_register_value (struct value *value,
 549                                        struct frame_info *frame);
 550
 551 extern struct value *value_from_register (struct type *type, int regnum,
 552                                           struct frame_info *frame);
 553
 554 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 555                                         struct frame_info *frame);
 556
 557 extern struct value *value_of_variable (struct symbol *var,
 558                                         const struct block *b);
 559
 560 extern struct value *address_of_variable (struct symbol *var, struct block *b);
 561
 562 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 563
 564 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 565
 566 extern int symbol_read_needs_frame (struct symbol *);
 567
 568 extern struct value *read_var_value (struct symbol *var,
 569                                      struct frame_info *frame);
 570
 571 extern struct value *default_read_var_value (struct symbol *var,
 572                                              struct frame_info *frame);
 573
 574 extern struct value *allocate_value (struct type *type);
 575 extern struct value *allocate_value_lazy (struct type *type);
 576 extern void allocate_value_contents (struct value *value);
 577 extern void value_contents_copy (struct value *dst, int dst_offset,
 578                                  struct value *src, int src_offset,
 579                                  int length);
 580 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 581                                      struct value *src, int src_offset,
 582                                      int length);
 583
 584 extern struct value *allocate_repeat_value (struct type *type, int count);
 585
 586 extern struct value *value_mark (void);
 587
 588 extern void value_free_to_mark (struct value *mark);
 589
 590 extern struct value *value_cstring (char *ptr, int len,
 591                                     struct type *char_type);
 592 extern struct value *value_string (char *ptr, int len,
 593                                    struct type *char_type);
 594 extern struct value *value_bitstring (char *ptr, int len,
 595                                       struct type *index_type);
 596
 597 extern struct value *value_array (int lowbound, int highbound,
 598                                   struct value **elemvec);
 599
 600 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 601
 602 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 603                                   enum exp_opcode op);
 604
 605 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 606
 607 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 608
 609 extern int value_must_coerce_to_target (struct value *arg1);
 610
 611 extern struct value *value_coerce_to_target (struct value *arg1);
 612
 613 extern struct value *value_coerce_array (struct value *arg1);
 614
 615 extern struct value *value_coerce_function (struct value *arg1);
 616
 617 extern struct value *value_ind (struct value *arg1);
 618
 619 extern struct value *value_addr (struct value *arg1);
 620
 621 extern struct value *value_ref (struct value *arg1);
 622
 623 extern struct value *value_assign (struct value *toval,
 624                                    struct value *fromval);
 625
 626 extern struct value *value_pos (struct value *arg1);
 627
 628 extern struct value *value_neg (struct value *arg1);
 629
 630 extern struct value *value_complement (struct value *arg1);
 631
 632 extern struct value *value_struct_elt (struct value **argp,
 633                                        struct value **args,
 634                                        const char *name, int *static_memfuncp,
 635                                        const char *err);
 636
 637 extern struct value *value_aggregate_elt (struct type *curtype,
 638                                           char *name,
 639                                           struct type *expect_type,
 640                                           int want_address,
 641                                           enum noside noside);
 642
 643 extern struct value *value_static_field (struct type *type, int fieldno);
 644
 645 extern struct fn_field *value_find_oload_method_list (struct value **,
 646                                                       const char *,
 647                                                       int, int *,
 648                                                       struct type **, int *);
 649
 650 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 651
 652 extern int find_overload_match (struct value **args, int nargs,
 653                                 const char *name,
 654                                 enum oload_search_type method, int lax,
 655                                 struct value **objp, struct symbol *fsym,
 656                                 struct value **valp, struct symbol **symp,
 657                                 int *staticp, const int no_adl);
 658
 659 extern struct value *value_field (struct value *arg1, int fieldno);
 660
 661 extern struct value *value_primitive_field (struct value *arg1, int offset,
 662                                             int fieldno,
 663                                             struct type *arg_type);
 664
 665
 666 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 667                                               int *);
 668
 669 extern struct value *value_full_object (struct value *, struct type *, int,
 670                                         int, int);
 671
 672 extern struct value *value_cast_pointers (struct type *, struct value *);
 673
 674 extern struct value *value_cast (struct type *type, struct value *arg2);
 675
 676 extern struct value *value_reinterpret_cast (struct type *type,
 677                                              struct value *arg);
 678
 679 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 680
 681 extern struct value *value_zero (struct type *type, enum lval_type lv);
 682
 683 extern struct value *value_one (struct type *type);
 684
 685 extern struct value *value_repeat (struct value *arg1, int count);
 686
 687 extern struct value *value_subscript (struct value *array, LONGEST index);
 688
 689 extern struct value *value_bitstring_subscript (struct type *type,
 690                                                 struct value *bitstring,
 691                                                 LONGEST index);
 692
 693 extern struct value *register_value_being_returned (struct type *valtype,
 694                                                     struct regcache *retbuf);
 695
 696 extern int value_in (struct value *element, struct value *set);
 697
 698 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 699                             int index);
 700
 701 extern int using_struct_return (struct gdbarch *gdbarch,
 702                                 struct value *function,
 703                                 struct type *value_type);
 704
 705 extern struct value *evaluate_expression (struct expression *exp);
 706
 707 extern struct value *evaluate_type (struct expression *exp);
 708
 709 extern struct value *evaluate_subexp (struct type *expect_type,
 710                                       struct expression *exp,
 711                                       int *pos, enum noside noside);
 712
 713 extern struct value *evaluate_subexpression_type (struct expression *exp,
 714                                                   int subexp);
 715
 716 extern void fetch_subexp_value (struct expression *exp, int *pc,
 717                                 struct value **valp, struct value **resultp,
 718                                 struct value **val_chain);
 719
 720 extern char *extract_field_op (struct expression *exp, int *subexp);
 721
 722 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 723                                                     int *, enum noside);
 724
 725 extern struct value *parse_and_eval (char *exp);
 726
 727 extern struct value *parse_to_comma_and_eval (char **expp);
 728
 729 extern struct type *parse_and_eval_type (char *p, int length);
 730
 731 extern CORE_ADDR parse_and_eval_address (char *exp);
 732
 733 extern LONGEST parse_and_eval_long (char *exp);
 734
 735 extern void unop_promote (const struct language_defn *language,
 736                           struct gdbarch *gdbarch,
 737                           struct value **arg1);
 738
 739 extern void binop_promote (const struct language_defn *language,
 740                            struct gdbarch *gdbarch,
 741                            struct value **arg1, struct value **arg2);
 742
 743 extern struct value *access_value_history (int num);
 744
 745 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 746                                            struct internalvar *var);
 747
 748 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 749
 750 extern void set_internalvar (struct internalvar *var, struct value *val);
 751
 752 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 753
 754 extern void set_internalvar_string (struct internalvar *var,
 755                                     const char *string);
 756
 757 extern void clear_internalvar (struct internalvar *var);
 758
 759 extern void set_internalvar_component (struct internalvar *var,
 760                                        int offset,
 761                                        int bitpos, int bitsize,
 762                                        struct value *newvalue);
 763
 764 extern struct internalvar *lookup_only_internalvar (const char *name);
 765
 766 extern struct internalvar *create_internalvar (const char *name);
 767
 768 /* An internalvar can be dynamically computed by supplying a vector of
 769    function pointers to perform various operations.  */
 770
 771 struct internalvar_funcs
 772 {
 773   /* Compute the value of the variable.  The DATA argument passed to
 774      the function is the same argument that was passed to
 775      `create_internalvar_type_lazy'.  */
 776
 777   struct value *(*make_value) (struct gdbarch *arch,
 778                                struct internalvar *var,
 779                                void *data);
 780
 781   /* Update the agent expression EXPR with bytecode to compute the
 782      value.  VALUE is the agent value we are updating.  The DATA
 783      argument passed to this function is the same argument that was
 784      passed to `create_internalvar_type_lazy'.  If this pointer is
 785      NULL, then the internalvar cannot be compiled to an agent
 786      expression.  */
 787
 788   void (*compile_to_ax) (struct internalvar *var,
 789                          struct agent_expr *expr,
 790                          struct axs_value *value,
 791                          void *data);
 792
 793   /* If non-NULL, this is called to destroy DATA.  The DATA argument
 794      passed to this function is the same argument that was passed to
 795      `create_internalvar_type_lazy'.  */
 796
 797   void (*destroy) (void *data);
 798 };
 799
 800 extern struct internalvar *
 801 create_internalvar_type_lazy (const char *name,
 802                               const struct internalvar_funcs *funcs,
 803                               void *data);
 804
 805 /* Compile an internal variable to an agent expression.  VAR is the
 806    variable to compile; EXPR and VALUE are the agent expression we are
 807    updating.  This will return 0 if there is no known way to compile
 808    VAR, and 1 if VAR was successfully compiled.  It may also throw an
 809    exception on error.  */
 810
 811 extern int compile_internalvar_to_ax (struct internalvar *var,
 812                                       struct agent_expr *expr,
 813                                       struct axs_value *value);
 814
 815 extern struct internalvar *lookup_internalvar (const char *name);
 816
 817 extern int value_equal (struct value *arg1, struct value *arg2);
 818
 819 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 820
 821 extern int value_less (struct value *arg1, struct value *arg2);
 822
 823 extern int value_logical_not (struct value *arg1);
 824
 825 /* C++ */
 826
 827 extern struct value *value_of_this (const struct language_defn *lang);
 828
 829 extern struct value *value_of_this_silent (const struct language_defn *lang);
 830
 831 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 832                                     enum exp_opcode op,
 833                                     enum exp_opcode otherop,
 834                                     enum noside noside);
 835
 836 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 837                                    enum noside noside);
 838
 839 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 840                                      int j, struct type *type, int offset);
 841
 842 extern int binop_types_user_defined_p (enum exp_opcode op,
 843                                        struct type *type1,
 844                                        struct type *type2);
 845
 846 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 847                                  struct value *arg2);
 848
 849 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 850
 851 extern int destructor_name_p (const char *name, struct type *type);
 852
 853 extern void value_incref (struct value *val);
 854
 855 extern void value_free (struct value *val);
 856
 857 extern void free_all_values (void);
 858
 859 extern void free_value_chain (struct value *v);
 860
 861 extern void release_value (struct value *val);
 862
 863 extern void release_value_or_incref (struct value *val);
 864
 865 extern int record_latest_value (struct value *val);
 866
 867 extern void modify_field (struct type *type, gdb_byte *addr,
 868                           LONGEST fieldval, int bitpos, int bitsize);
 869
 870 extern void type_print (struct type *type, const char *varstring,
 871                         struct ui_file *stream, int show);
 872
 873 extern char *type_to_string (struct type *type);
 874
 875 extern gdb_byte *baseclass_addr (struct type *type, int index,
 876                                  gdb_byte *valaddr,
 877                                  struct value **valuep, int *errp);
 878
 879 extern void print_longest (struct ui_file *stream, int format,
 880                            int use_local, LONGEST val);
 881
 882 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 883                             struct ui_file *stream);
 884
 885 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 886                                     struct ui_file *stream);
 887
 888 extern void value_print (struct value *val, struct ui_file *stream,
 889                          const struct value_print_options *options);
 890
 891 extern void value_print_array_elements (struct value *val,
 892                                         struct ui_file *stream, int format,
 893                                         enum val_prettyprint pretty);
 894
 895 extern struct value *value_release_to_mark (struct value *mark);
 896
 897 extern void val_print (struct type *type, const gdb_byte *valaddr,
 898                        int embedded_offset, CORE_ADDR address,
 899                        struct ui_file *stream, int recurse,
 900                        const struct value *val,
 901                        const struct value_print_options *options,
 902                        const struct language_defn *language);
 903
 904 extern void common_val_print (struct value *val,
 905                               struct ui_file *stream, int recurse,
 906                               const struct value_print_options *options,
 907                               const struct language_defn *language);
 908
 909 extern int val_print_string (struct type *elttype, const char *encoding,
 910                              CORE_ADDR addr, int len,
 911                              struct ui_file *stream,
 912                              const struct value_print_options *options);
 913
 914 extern void print_variable_and_value (const char *name,
 915                                       struct symbol *var,
 916                                       struct frame_info *frame,
 917                                       struct ui_file *stream,
 918                                       int indent);
 919
 920 extern int check_field (struct type *, const char *);
 921
 922 extern void typedef_print (struct type *type, struct symbol *news,
 923                            struct ui_file *stream);
 924
 925 extern char *internalvar_name (struct internalvar *var);
 926
 927 extern void preserve_values (struct objfile *);
 928
 929 /* From values.c */
 930
 931 extern struct value *value_copy (struct value *);
 932
 933 extern struct value *value_non_lval (struct value *);
 934
 935 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 936
 937 /* From valops.c */
 938
 939 extern struct value *varying_to_slice (struct value *);
 940
 941 extern struct value *value_slice (struct value *, int, int);
 942
 943 extern struct value *value_literal_complex (struct value *, struct value *,
 944                                             struct type *);
 945
 946 extern struct value *find_function_in_inferior (const char *,
 947                                                 struct objfile **);
 948
 949 extern struct value *value_allocate_space_in_inferior (int);
 950
 951 extern struct value *value_subscripted_rvalue (struct value *array,
 952                                                LONGEST index, int lowerbound);
 953
 954 /* User function handler.  */
 955
 956 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 957                                                const struct language_defn *language,
 958                                                void *cookie,
 959                                                int argc,
 960                                                struct value **argv);
 961
 962 void add_internal_function (const char *name, const char *doc,
 963                             internal_function_fn handler,
 964                             void *cookie);
 965
 966 struct value *call_internal_function (struct gdbarch *gdbarch,
 967                                       const struct language_defn *language,
 968                                       struct value *function,
 969                                       int argc, struct value **argv);
 970
 971 char *value_internal_function_name (struct value *);
 972
 973 #endif /* !defined (VALUE_H) */