gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986-2013 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
  94 /* If a value represents a C++ object, then the `type' field gives the
  95    object's compile-time type.  If the object actually belongs to some
  96    class derived from `type', perhaps with other base classes and
  97    additional members, then `type' is just a subobject of the real
  98    thing, and the full object is probably larger than `type' would
  99    suggest.
 100
 101    If `type' is a dynamic class (i.e. one with a vtable), then GDB can
 102    actually determine the object's run-time type by looking at the
 103    run-time type information in the vtable.  When this information is
 104    available, we may elect to read in the entire object, for several
 105    reasons:
 106
 107    - When printing the value, the user would probably rather see the
 108      full object, not just the limited portion apparent from the
 109      compile-time type.
 110
 111    - If `type' has virtual base classes, then even printing `type'
 112      alone may require reaching outside the `type' portion of the
 113      object to wherever the virtual base class has been stored.
 114
 115    When we store the entire object, `enclosing_type' is the run-time
 116    type -- the complete object -- and `embedded_offset' is the offset
 117    of `type' within that larger type, in bytes.  The value_contents()
 118    macro takes `embedded_offset' into account, so most GDB code
 119    continues to see the `type' portion of the value, just as the
 120    inferior would.
 121
 122    If `type' is a pointer to an object, then `enclosing_type' is a
 123    pointer to the object's run-time type, and `pointed_to_offset' is
 124    the offset in bytes from the full object to the pointed-to object
 125    -- that is, the value `embedded_offset' would have if we followed
 126    the pointer and fetched the complete object.  (I don't really see
 127    the point.  Why not just determine the run-time type when you
 128    indirect, and avoid the special case?  The contents don't matter
 129    until you indirect anyway.)
 130
 131    If we're not doing anything fancy, `enclosing_type' is equal to
 132    `type', and `embedded_offset' is zero, so everything works
 133    normally.  */
 134
 135 extern struct type *value_enclosing_type (struct value *);
 136 extern void set_value_enclosing_type (struct value *val,
 137                                       struct type *new_type);
 138
 139 /* Returns value_type or value_enclosing_type depending on
 140    value_print_options.objectprint.
 141
 142    If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved
 143    only for pointers and references, else it will be returned
 144    for all the types (e.g. structures).  This option is useful
 145    to prevent retrieving enclosing type for the base classes fields.
 146
 147    REAL_TYPE_FOUND is used to inform whether the real type was found
 148    (or just static type was used).  The NULL may be passed if it is not
 149    necessary. */
 150
 151 extern struct type *value_actual_type (struct value *value,
 152                                        int resolve_simple_types,
 153                                        int *real_type_found);
 154
 155 extern int value_pointed_to_offset (struct value *value);
 156 extern void set_value_pointed_to_offset (struct value *value, int val);
 157 extern int value_embedded_offset (struct value *value);
 158 extern void set_value_embedded_offset (struct value *value, int val);
 159
 160 /* For lval_computed values, this structure holds functions used to
 161    retrieve and set the value (or portions of the value).
 162
 163    For each function, 'V' is the 'this' pointer: an lval_funcs
 164    function F may always assume that the V it receives is an
 165    lval_computed value, and has F in the appropriate slot of its
 166    lval_funcs structure.  */
 167
 168 struct lval_funcs
 169 {
 170   /* Fill in VALUE's contents.  This is used to "un-lazy" values.  If
 171      a problem arises in obtaining VALUE's bits, this function should
 172      call 'error'.  If it is NULL value_fetch_lazy on "un-lazy"
 173      non-optimized-out value is an internal error.  */
 174   void (*read) (struct value *v);
 175
 176   /* Handle an assignment TOVAL = FROMVAL by writing the value of
 177      FROMVAL to TOVAL's location.  The contents of TOVAL have not yet
 178      been updated.  If a problem arises in doing so, this function
 179      should call 'error'.  If it is NULL such TOVAL assignment is an error as
 180      TOVAL is not considered as an lvalue.  */
 181   void (*write) (struct value *toval, struct value *fromval);
 182
 183   /* Check the validity of some bits in VALUE.  This should return 1
 184      if all the bits starting at OFFSET and extending for LENGTH bits
 185      are valid, or 0 if any bit is invalid.  */
 186   int (*check_validity) (const struct value *value, int offset, int length);
 187
 188   /* Return 1 if any bit in VALUE is valid, 0 if they are all invalid.  */
 189   int (*check_any_valid) (const struct value *value);
 190
 191   /* If non-NULL, this is used to implement pointer indirection for
 192      this value.  This method may return NULL, in which case value_ind
 193      will fall back to ordinary indirection.  */
 194   struct value *(*indirect) (struct value *value);
 195
 196   /* If non-NULL, this is used to implement reference resolving for
 197      this value.  This method may return NULL, in which case coerce_ref
 198      will fall back to ordinary references resolving.  */
 199   struct value *(*coerce_ref) (const struct value *value);
 200
 201   /* If non-NULL, this is used to determine whether the indicated bits
 202      of VALUE are a synthetic pointer.  */
 203   int (*check_synthetic_pointer) (const struct value *value,
 204                                   int offset, int length);
 205
 206   /* Return a duplicate of VALUE's closure, for use in a new value.
 207      This may simply return the same closure, if VALUE's is
 208      reference-counted or statically allocated.
 209
 210      This may be NULL, in which case VALUE's closure is re-used in the
 211      new value.  */
 212   void *(*copy_closure) (const struct value *v);
 213
 214   /* Drop VALUE's reference to its closure.  Maybe this frees the
 215      closure; maybe this decrements a reference count; maybe the
 216      closure is statically allocated and this does nothing.
 217
 218      This may be NULL, in which case no action is taken to free
 219      VALUE's closure.  */
 220   void (*free_closure) (struct value *v);
 221 };
 222
 223 /* Create a computed lvalue, with type TYPE, function pointers FUNCS,
 224    and closure CLOSURE.  */
 225
 226 extern struct value *allocate_computed_value (struct type *type,
 227                                               const struct lval_funcs *funcs,
 228                                               void *closure);
 229
 230 /* Helper function to check the validity of some bits of a value.
 231
 232    If TYPE represents some aggregate type (e.g., a structure), return 1.
 233
 234    Otherwise, any of the bytes starting at OFFSET and extending for
 235    TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and
 236    return 0.  The checking is done using FUNCS.
 237
 238    Otherwise, return 1.  */
 239
 240 extern int valprint_check_validity (struct ui_file *stream, struct type *type,
 241                                     int embedded_offset,
 242                                     const struct value *val);
 243
 244 extern struct value *allocate_optimized_out_value (struct type *type);
 245
 246 /* If VALUE is lval_computed, return its lval_funcs structure.  */
 247
 248 extern const struct lval_funcs *value_computed_funcs (const struct value *);
 249
 250 /* If VALUE is lval_computed, return its closure.  The meaning of the
 251    returned value depends on the functions VALUE uses.  */
 252
 253 extern void *value_computed_closure (const struct value *value);
 254
 255 /* If zero, contents of this value are in the contents field.  If
 256    nonzero, contents are in inferior.  If the lval field is lval_memory,
 257    the contents are in inferior memory at location.address plus offset.
 258    The lval field may also be lval_register.
 259
 260    WARNING: This field is used by the code which handles watchpoints
 261    (see breakpoint.c) to decide whether a particular value can be
 262    watched by hardware watchpoints.  If the lazy flag is set for some
 263    member of a value chain, it is assumed that this member of the
 264    chain doesn't need to be watched as part of watching the value
 265    itself.  This is how GDB avoids watching the entire struct or array
 266    when the user wants to watch a single struct member or array
 267    element.  If you ever change the way lazy flag is set and reset, be
 268    sure to consider this use as well!  */
 269
 270 extern int value_lazy (struct value *);
 271 extern void set_value_lazy (struct value *value, int val);
 272
 273 extern int value_stack (struct value *);
 274 extern void set_value_stack (struct value *value, int val);
 275
 276 /* Throw an error complaining that the value has been optimized
 277    out.  */
 278
 279 extern void error_value_optimized_out (void);
 280
 281 /* value_contents() and value_contents_raw() both return the address
 282    of the gdb buffer used to hold a copy of the contents of the lval.
 283    value_contents() is used when the contents of the buffer are needed
 284    -- it uses value_fetch_lazy() to load the buffer from the process
 285    being debugged if it hasn't already been loaded
 286    (value_contents_writeable() is used when a writeable but fetched
 287    buffer is required)..  value_contents_raw() is used when data is
 288    being stored into the buffer, or when it is certain that the
 289    contents of the buffer are valid.
 290
 291    Note: The contents pointer is adjusted by the offset required to
 292    get to the real subobject, if the value happens to represent
 293    something embedded in a larger run-time object.  */
 294
 295 extern gdb_byte *value_contents_raw (struct value *);
 296
 297 /* Actual contents of the value.  For use of this value; setting it
 298    uses the stuff above.  Not valid if lazy is nonzero.  Target
 299    byte-order.  We force it to be aligned properly for any possible
 300    value.  Note that a value therefore extends beyond what is
 301    declared here.  */
 302
 303 extern const gdb_byte *value_contents (struct value *);
 304 extern gdb_byte *value_contents_writeable (struct value *);
 305
 306 /* The ALL variants of the above two macros do not adjust the returned
 307    pointer by the embedded_offset value.  */
 308
 309 extern gdb_byte *value_contents_all_raw (struct value *);
 310 extern const gdb_byte *value_contents_all (struct value *);
 311
 312 /* Like value_contents_all, but does not require that the returned
 313    bits be valid.  This should only be used in situations where you
 314    plan to check the validity manually.  */
 315 extern const gdb_byte *value_contents_for_printing (struct value *value);
 316
 317 /* Like value_contents_for_printing, but accepts a constant value
 318    pointer.  Unlike value_contents_for_printing however, the pointed
 319    value must _not_ be lazy.  */
 320 extern const gdb_byte *
 321   value_contents_for_printing_const (const struct value *value);
 322
 323 extern int value_fetch_lazy (struct value *val);
 324 extern int value_contents_equal (struct value *val1, struct value *val2);
 325
 326 /* If nonzero, this is the value of a variable which does not actually
 327    exist in the program, at least partially.  If the value is lazy,
 328    this may fetch it now.  */
 329 extern int value_optimized_out (struct value *value);
 330 extern void set_value_optimized_out (struct value *value, int val);
 331
 332 /* Like value_optimized_out, but don't fetch the value even if it is
 333    lazy.  Mainly useful for constructing other values using VALUE as
 334    template.  */
 335 extern int value_optimized_out_const (const struct value *value);
 336
 337 /* Like value_optimized_out, but return false if any bit in the object
 338    is valid.  */
 339 extern int value_entirely_optimized_out (const struct value *value);
 340
 341 /* Set or return field indicating whether a variable is initialized or
 342    not, based on debugging information supplied by the compiler.
 343    1 = initialized; 0 = uninitialized.  */
 344 extern int value_initialized (struct value *);
 345 extern void set_value_initialized (struct value *, int);
 346
 347 /* Set COMPONENT's location as appropriate for a component of WHOLE
 348    --- regardless of what kind of lvalue WHOLE is.  */
 349 extern void set_value_component_location (struct value *component,
 350                                           const struct value *whole);
 351
 352 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 353    single value might have multiple LVALs), this hacked interface is
 354    limited to just the first PIECE.  Expect further change.  */
 355 /* Type of value; either not an lval, or one of the various different
 356    possible kinds of lval.  */
 357 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 358 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 359
 360 /* Like VALUE_LVAL, except the parameter can be const.  */
 361 extern enum lval_type value_lval_const (const struct value *value);
 362
 363 /* If lval == lval_memory, return the address in the inferior.  If
 364    lval == lval_register, return the byte offset into the registers
 365    structure.  Otherwise, return 0.  The returned address
 366    includes the offset, if any.  */
 367 extern CORE_ADDR value_address (const struct value *);
 368
 369 /* Like value_address, except the result does not include value's
 370    offset.  */
 371 extern CORE_ADDR value_raw_address (struct value *);
 372
 373 /* Set the address of a value.  */
 374 extern void set_value_address (struct value *, CORE_ADDR);
 375
 376 /* Pointer to internal variable.  */
 377 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 378 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 379
 380 /* Frame register value is relative to.  This will be described in the
 381    lval enum above as "lval_register".  */
 382 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 383 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 384
 385 /* Register number if the value is from a register.  */
 386 extern short *deprecated_value_regnum_hack (struct value *);
 387 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 388
 389 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
 390    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
 391
 392 extern struct value *coerce_ref_if_computed (const struct value *arg);
 393
 394 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
 395    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
 396    ORIGINAL_VAL are the type and value of the original reference or pointer.
 397
 398    Note, that VALUE is modified by this function.
 399
 400    It is a common implementation for coerce_ref and value_ind.  */
 401
 402 extern struct value * readjust_indirect_value_type (struct value *value,
 403                                                     struct type *enc_type,
 404                                                     struct type *original_type,
 405                                                     struct value *original_val);
 406
 407 /* Convert a REF to the object referenced.  */
 408
 409 extern struct value *coerce_ref (struct value *value);
 410
 411 /* If ARG is an array, convert it to a pointer.
 412    If ARG is a function, convert it to a function pointer.
 413
 414    References are dereferenced.  */
 415
 416 extern struct value *coerce_array (struct value *value);
 417
 418 /* Given a value, determine whether the bits starting at OFFSET and
 419    extending for LENGTH bits are valid.  This returns nonzero if all
 420    bits in the given range are valid, zero if any bit is invalid.  */
 421
 422 extern int value_bits_valid (const struct value *value,
 423                              int offset, int length);
 424
 425 /* Given a value, determine whether the bits starting at OFFSET and
 426    extending for LENGTH bits are a synthetic pointer.  */
 427
 428 extern int value_bits_synthetic_pointer (const struct value *value,
 429                                          int offset, int length);
 430
 431 /* Given a value, determine whether the contents bytes starting at
 432    OFFSET and extending for LENGTH bytes are available.  This returns
 433    nonzero if all bytes in the given range are available, zero if any
 434    byte is unavailable.  */
 435
 436 extern int value_bytes_available (const struct value *value,
 437                                   int offset, int length);
 438
 439 /* Like value_bytes_available, but return false if any byte in the
 440    whole object is unavailable.  */
 441 extern int value_entirely_available (struct value *value);
 442
 443 /* Like value_entirely_available, but return false if any byte in the
 444    whole object is available.  */
 445 extern int value_entirely_unavailable (struct value *value);
 446
 447 /* Mark VALUE's content bytes starting at OFFSET and extending for
 448    LENGTH bytes as unavailable.  */
 449
 450 extern void mark_value_bytes_unavailable (struct value *value,
 451                                           int offset, int length);
 452
 453 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 454    LENGTH bytes of VAL2's contents starting at OFFSET2.
 455
 456    Note that "contents" refers to the whole value's contents
 457    (value_contents_all), without any embedded offset adjustment.  For
 458    example, to compare a complete object value with itself, including
 459    its enclosing type chunk, you'd do:
 460
 461      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 462      value_available_contents (val, 0, val, 0, len);
 463
 464    Returns true iff the set of available contents match.  Unavailable
 465    contents compare equal with unavailable contents, and different
 466    with any available byte.  For example, if 'x's represent an
 467    unavailable byte, and 'V' and 'Z' represent different available
 468    bytes, in a value with length 16:
 469
 470    offset:   0   4   8   12  16
 471    contents: xxxxVVVVxxxxVVZZ
 472
 473    then:
 474
 475    value_available_contents_eq(val, 0, val, 8, 6) => 1
 476    value_available_contents_eq(val, 0, val, 4, 4) => 1
 477    value_available_contents_eq(val, 0, val, 8, 8) => 0
 478    value_available_contents_eq(val, 4, val, 12, 2) => 1
 479    value_available_contents_eq(val, 4, val, 12, 4) => 0
 480    value_available_contents_eq(val, 3, val, 4, 4) => 0
 481
 482    We only know whether a value chunk is available if we've tried to
 483    read it.  As this routine is used by printing routines, which may
 484    be printing values in the value history, long after the inferior is
 485    gone, it works with const values.  Therefore, this routine must not
 486    be called with lazy values.  */
 487
 488 extern int value_available_contents_eq (const struct value *val1, int offset1,
 489                                         const struct value *val2, int offset2,
 490                                         int length);
 491
 492 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 493    is (or will be copied to) VAL's contents buffer offset by
 494    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 495    Marks value contents ranges as unavailable if the corresponding
 496    memory is likewise unavailable.  STACK indicates whether the memory
 497    is known to be stack memory.  */
 498
 499 extern void read_value_memory (struct value *val, int embedded_offset,
 500                                int stack, CORE_ADDR memaddr,
 501                                gdb_byte *buffer, size_t length);
 502
 503 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
 504    into each element of a new vector value with VECTOR_TYPE.  */
 505
 506 struct value *value_vector_widen (struct value *scalar_value,
 507                                   struct type *vector_type);
 508
 509 \f
 510
 511 #include "symtab.h"
 512 #include "gdbtypes.h"
 513 #include "expression.h"
 514
 515 struct frame_info;
 516 struct fn_field;
 517
 518 extern int print_address_demangle (const struct value_print_options *,
 519                                    struct gdbarch *, CORE_ADDR,
 520                                    struct ui_file *, int);
 521
 522 extern LONGEST value_as_long (struct value *val);
 523 extern DOUBLEST value_as_double (struct value *val);
 524 extern CORE_ADDR value_as_address (struct value *val);
 525
 526 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 527 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 528                                int *invp);
 529 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 530
 531 extern int unpack_value_bits_as_long (struct type *field_type,
 532                                       const gdb_byte *valaddr,
 533                                       int embedded_offset, int bitpos,
 534                                       int bitsize,
 535                                       const struct value *original_value,
 536                                       LONGEST *result);
 537
 538 extern LONGEST unpack_field_as_long (struct type *type,
 539                                      const gdb_byte *valaddr,
 540                                      int fieldno);
 541 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 542                                 int embedded_offset, int fieldno,
 543                                 const struct value *val, LONGEST *result);
 544
 545 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 546                                            const gdb_byte *valaddr,
 547                                            int embedded_offset,
 548                                            const struct value *val);
 549
 550 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 551
 552 extern struct value *value_from_longest (struct type *type, LONGEST num);
 553 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 554 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 555 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 556 extern struct value *value_from_decfloat (struct type *type,
 557                                           const gdb_byte *decbytes);
 558 extern struct value *value_from_history_ref (char *, char **);
 559
 560 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 561 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 562
 563 extern struct value *value_from_contents_and_address (struct type *,
 564                                                       const gdb_byte *,
 565                                                       CORE_ADDR);
 566 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 567
 568 extern struct value *default_value_from_register (struct type *type,
 569                                                   int regnum,
 570                                                   struct frame_info *frame);
 571
 572 extern void read_frame_register_value (struct value *value,
 573                                        struct frame_info *frame);
 574
 575 extern struct value *value_from_register (struct type *type, int regnum,
 576                                           struct frame_info *frame);
 577
 578 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 579                                         struct frame_info *frame);
 580
 581 extern struct value *value_of_variable (struct symbol *var,
 582                                         const struct block *b);
 583
 584 extern struct value *address_of_variable (struct symbol *var,
 585                                           const struct block *b);
 586
 587 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 588
 589 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 590
 591 extern int symbol_read_needs_frame (struct symbol *);
 592
 593 extern struct value *read_var_value (struct symbol *var,
 594                                      struct frame_info *frame);
 595
 596 extern struct value *default_read_var_value (struct symbol *var,
 597                                              struct frame_info *frame);
 598
 599 extern struct value *allocate_value (struct type *type);
 600 extern struct value *allocate_value_lazy (struct type *type);
 601 extern void value_contents_copy (struct value *dst, int dst_offset,
 602                                  struct value *src, int src_offset,
 603                                  int length);
 604 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 605                                      struct value *src, int src_offset,
 606                                      int length);
 607
 608 extern struct value *allocate_repeat_value (struct type *type, int count);
 609
 610 extern struct value *value_mark (void);
 611
 612 extern void value_free_to_mark (struct value *mark);
 613
 614 extern struct value *value_cstring (char *ptr, ssize_t len,
 615                                     struct type *char_type);
 616 extern struct value *value_string (char *ptr, ssize_t len,
 617                                    struct type *char_type);
 618
 619 extern struct value *value_array (int lowbound, int highbound,
 620                                   struct value **elemvec);
 621
 622 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 623
 624 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 625                                   enum exp_opcode op);
 626
 627 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 628
 629 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 630
 631 extern int value_must_coerce_to_target (struct value *arg1);
 632
 633 extern struct value *value_coerce_to_target (struct value *arg1);
 634
 635 extern struct value *value_coerce_array (struct value *arg1);
 636
 637 extern struct value *value_coerce_function (struct value *arg1);
 638
 639 extern struct value *value_ind (struct value *arg1);
 640
 641 extern struct value *value_addr (struct value *arg1);
 642
 643 extern struct value *value_ref (struct value *arg1);
 644
 645 extern struct value *value_assign (struct value *toval,
 646                                    struct value *fromval);
 647
 648 extern struct value *value_pos (struct value *arg1);
 649
 650 extern struct value *value_neg (struct value *arg1);
 651
 652 extern struct value *value_complement (struct value *arg1);
 653
 654 extern struct value *value_struct_elt (struct value **argp,
 655                                        struct value **args,
 656                                        const char *name, int *static_memfuncp,
 657                                        const char *err);
 658
 659 extern struct value *value_aggregate_elt (struct type *curtype,
 660                                           char *name,
 661                                           struct type *expect_type,
 662                                           int want_address,
 663                                           enum noside noside);
 664
 665 extern struct value *value_static_field (struct type *type, int fieldno);
 666
 667 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 668
 669 extern int find_overload_match (struct value **args, int nargs,
 670                                 const char *name,
 671                                 enum oload_search_type method,
 672                                 struct value **objp, struct symbol *fsym,
 673                                 struct value **valp, struct symbol **symp,
 674                                 int *staticp, const int no_adl);
 675
 676 extern struct value *value_field (struct value *arg1, int fieldno);
 677
 678 extern struct value *value_primitive_field (struct value *arg1, int offset,
 679                                             int fieldno,
 680                                             struct type *arg_type);
 681
 682
 683 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 684                                               int *);
 685
 686 extern struct value *value_full_object (struct value *, struct type *, int,
 687                                         int, int);
 688
 689 extern struct value *value_cast_pointers (struct type *, struct value *, int);
 690
 691 extern struct value *value_cast (struct type *type, struct value *arg2);
 692
 693 extern struct value *value_reinterpret_cast (struct type *type,
 694                                              struct value *arg);
 695
 696 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 697
 698 extern struct value *value_zero (struct type *type, enum lval_type lv);
 699
 700 extern struct value *value_one (struct type *type);
 701
 702 extern struct value *value_repeat (struct value *arg1, int count);
 703
 704 extern struct value *value_subscript (struct value *array, LONGEST index);
 705
 706 extern struct value *value_bitstring_subscript (struct type *type,
 707                                                 struct value *bitstring,
 708                                                 LONGEST index);
 709
 710 extern struct value *register_value_being_returned (struct type *valtype,
 711                                                     struct regcache *retbuf);
 712
 713 extern int value_in (struct value *element, struct value *set);
 714
 715 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 716                             int index);
 717
 718 extern enum return_value_convention
 719 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
 720                           struct type *value_type);
 721
 722 extern int using_struct_return (struct gdbarch *gdbarch,
 723                                 struct value *function,
 724                                 struct type *value_type);
 725
 726 extern struct value *evaluate_expression (struct expression *exp);
 727
 728 extern struct value *evaluate_type (struct expression *exp);
 729
 730 extern struct value *evaluate_subexp (struct type *expect_type,
 731                                       struct expression *exp,
 732                                       int *pos, enum noside noside);
 733
 734 extern struct value *evaluate_subexpression_type (struct expression *exp,
 735                                                   int subexp);
 736
 737 extern void fetch_subexp_value (struct expression *exp, int *pc,
 738                                 struct value **valp, struct value **resultp,
 739                                 struct value **val_chain,
 740                                 int preserve_errors);
 741
 742 extern char *extract_field_op (struct expression *exp, int *subexp);
 743
 744 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 745                                                     int *, enum noside);
 746
 747 extern struct value *parse_and_eval (const char *exp);
 748
 749 extern struct value *parse_to_comma_and_eval (const char **expp);
 750
 751 extern struct type *parse_and_eval_type (char *p, int length);
 752
 753 extern CORE_ADDR parse_and_eval_address (const char *exp);
 754
 755 extern LONGEST parse_and_eval_long (const char *exp);
 756
 757 extern void unop_promote (const struct language_defn *language,
 758                           struct gdbarch *gdbarch,
 759                           struct value **arg1);
 760
 761 extern void binop_promote (const struct language_defn *language,
 762                            struct gdbarch *gdbarch,
 763                            struct value **arg1, struct value **arg2);
 764
 765 extern struct value *access_value_history (int num);
 766
 767 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 768                                            struct internalvar *var);
 769
 770 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 771
 772 extern void set_internalvar (struct internalvar *var, struct value *val);
 773
 774 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 775
 776 extern void set_internalvar_string (struct internalvar *var,
 777                                     const char *string);
 778
 779 extern void clear_internalvar (struct internalvar *var);
 780
 781 extern void set_internalvar_component (struct internalvar *var,
 782                                        int offset,
 783                                        int bitpos, int bitsize,
 784                                        struct value *newvalue);
 785
 786 extern struct internalvar *lookup_only_internalvar (const char *name);
 787
 788 extern struct internalvar *create_internalvar (const char *name);
 789
 790 extern VEC (char_ptr) *complete_internalvar (const char *name);
 791
 792 /* An internalvar can be dynamically computed by supplying a vector of
 793    function pointers to perform various operations.  */
 794
 795 struct internalvar_funcs
 796 {
 797   /* Compute the value of the variable.  The DATA argument passed to
 798      the function is the same argument that was passed to
 799      `create_internalvar_type_lazy'.  */
 800
 801   struct value *(*make_value) (struct gdbarch *arch,
 802                                struct internalvar *var,
 803                                void *data);
 804
 805   /* Update the agent expression EXPR with bytecode to compute the
 806      value.  VALUE is the agent value we are updating.  The DATA
 807      argument passed to this function is the same argument that was
 808      passed to `create_internalvar_type_lazy'.  If this pointer is
 809      NULL, then the internalvar cannot be compiled to an agent
 810      expression.  */
 811
 812   void (*compile_to_ax) (struct internalvar *var,
 813                          struct agent_expr *expr,
 814                          struct axs_value *value,
 815                          void *data);
 816
 817   /* If non-NULL, this is called to destroy DATA.  The DATA argument
 818      passed to this function is the same argument that was passed to
 819      `create_internalvar_type_lazy'.  */
 820
 821   void (*destroy) (void *data);
 822 };
 823
 824 extern struct internalvar *create_internalvar_type_lazy (const char *name,
 825                                 const struct internalvar_funcs *funcs,
 826                                 void *data);
 827
 828 /* Compile an internal variable to an agent expression.  VAR is the
 829    variable to compile; EXPR and VALUE are the agent expression we are
 830    updating.  This will return 0 if there is no known way to compile
 831    VAR, and 1 if VAR was successfully compiled.  It may also throw an
 832    exception on error.  */
 833
 834 extern int compile_internalvar_to_ax (struct internalvar *var,
 835                                       struct agent_expr *expr,
 836                                       struct axs_value *value);
 837
 838 extern struct internalvar *lookup_internalvar (const char *name);
 839
 840 extern int value_equal (struct value *arg1, struct value *arg2);
 841
 842 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 843
 844 extern int value_less (struct value *arg1, struct value *arg2);
 845
 846 extern int value_logical_not (struct value *arg1);
 847
 848 /* C++ */
 849
 850 extern struct value *value_of_this (const struct language_defn *lang);
 851
 852 extern struct value *value_of_this_silent (const struct language_defn *lang);
 853
 854 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 855                                     enum exp_opcode op,
 856                                     enum exp_opcode otherop,
 857                                     enum noside noside);
 858
 859 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 860                                    enum noside noside);
 861
 862 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 863                                      int j, struct type *type, int offset);
 864
 865 extern int binop_types_user_defined_p (enum exp_opcode op,
 866                                        struct type *type1,
 867                                        struct type *type2);
 868
 869 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 870                                  struct value *arg2);
 871
 872 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 873
 874 extern int destructor_name_p (const char *name, struct type *type);
 875
 876 extern void value_incref (struct value *val);
 877
 878 extern void value_free (struct value *val);
 879
 880 extern void free_all_values (void);
 881
 882 extern void free_value_chain (struct value *v);
 883
 884 extern void release_value (struct value *val);
 885
 886 extern void release_value_or_incref (struct value *val);
 887
 888 extern int record_latest_value (struct value *val);
 889
 890 extern void modify_field (struct type *type, gdb_byte *addr,
 891                           LONGEST fieldval, int bitpos, int bitsize);
 892
 893 extern void type_print (struct type *type, const char *varstring,
 894                         struct ui_file *stream, int show);
 895
 896 extern char *type_to_string (struct type *type);
 897
 898 extern gdb_byte *baseclass_addr (struct type *type, int index,
 899                                  gdb_byte *valaddr,
 900                                  struct value **valuep, int *errp);
 901
 902 extern void print_longest (struct ui_file *stream, int format,
 903                            int use_local, LONGEST val);
 904
 905 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 906                             struct ui_file *stream);
 907
 908 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 909                                     struct ui_file *stream);
 910
 911 extern void value_print (struct value *val, struct ui_file *stream,
 912                          const struct value_print_options *options);
 913
 914 extern void value_print_array_elements (struct value *val,
 915                                         struct ui_file *stream, int format,
 916                                         enum val_prettyformat pretty);
 917
 918 extern struct value *value_release_to_mark (struct value *mark);
 919
 920 extern void val_print (struct type *type, const gdb_byte *valaddr,
 921                        int embedded_offset, CORE_ADDR address,
 922                        struct ui_file *stream, int recurse,
 923                        const struct value *val,
 924                        const struct value_print_options *options,
 925                        const struct language_defn *language);
 926
 927 extern void common_val_print (struct value *val,
 928                               struct ui_file *stream, int recurse,
 929                               const struct value_print_options *options,
 930                               const struct language_defn *language);
 931
 932 extern int val_print_string (struct type *elttype, const char *encoding,
 933                              CORE_ADDR addr, int len,
 934                              struct ui_file *stream,
 935                              const struct value_print_options *options);
 936
 937 extern void print_variable_and_value (const char *name,
 938                                       struct symbol *var,
 939                                       struct frame_info *frame,
 940                                       struct ui_file *stream,
 941                                       int indent);
 942
 943 extern void typedef_print (struct type *type, struct symbol *news,
 944                            struct ui_file *stream);
 945
 946 extern char *internalvar_name (struct internalvar *var);
 947
 948 extern void preserve_values (struct objfile *);
 949
 950 /* From values.c */
 951
 952 extern struct value *value_copy (struct value *);
 953
 954 extern struct value *value_non_lval (struct value *);
 955
 956 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 957
 958 /* From valops.c */
 959
 960 extern struct value *varying_to_slice (struct value *);
 961
 962 extern struct value *value_slice (struct value *, int, int);
 963
 964 extern struct value *value_literal_complex (struct value *, struct value *,
 965                                             struct type *);
 966
 967 extern struct value *find_function_in_inferior (const char *,
 968                                                 struct objfile **);
 969
 970 extern struct value *value_allocate_space_in_inferior (int);
 971
 972 extern struct value *value_subscripted_rvalue (struct value *array,
 973                                                LONGEST index, int lowerbound);
 974
 975 /* User function handler.  */
 976
 977 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 978                                                const struct language_defn *language,
 979                                                void *cookie,
 980                                                int argc,
 981                                                struct value **argv);
 982
 983 void add_internal_function (const char *name, const char *doc,
 984                             internal_function_fn handler,
 985                             void *cookie);
 986
 987 struct value *call_internal_function (struct gdbarch *gdbarch,
 988                                       const struct language_defn *language,
 989                                       struct value *function,
 990                                       int argc, struct value **argv);
 991
 992 char *value_internal_function_name (struct value *);
 993
 994 #endif /* !defined (VALUE_H) */