gdb/value.h

   1 /* Definitions for values of C expressions, for GDB.
   2
   3    Copyright (C) 1986-2014 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 /* Given a value, determine whether the contents bits starting at
 440    OFFSET and extending for LENGTH bits are available.  This returns
 441    nonzero if all bits in the given range are available, zero if any
 442    bit is unavailable.  */
 443
 444 extern int value_bits_available (const struct value *value,
 445                                  int offset, int length);
 446
 447 /* Like value_bytes_available, but return false if any byte in the
 448    whole object is unavailable.  */
 449 extern int value_entirely_available (struct value *value);
 450
 451 /* Like value_entirely_available, but return false if any byte in the
 452    whole object is available.  */
 453 extern int value_entirely_unavailable (struct value *value);
 454
 455 /* Mark VALUE's content bytes starting at OFFSET and extending for
 456    LENGTH bytes as unavailable.  */
 457
 458 extern void mark_value_bytes_unavailable (struct value *value,
 459                                           int offset, int length);
 460
 461 /* Mark VALUE's content bits starting at OFFSET and extending for
 462    LENGTH bits as unavailable.  */
 463
 464 extern void mark_value_bits_unavailable (struct value *value,
 465                                          int offset, int length);
 466
 467 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 468    LENGTH bytes of VAL2's contents starting at OFFSET2.
 469
 470    Note that "contents" refers to the whole value's contents
 471    (value_contents_all), without any embedded offset adjustment.  For
 472    example, to compare a complete object value with itself, including
 473    its enclosing type chunk, you'd do:
 474
 475      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 476      value_available_contents (val, 0, val, 0, len);
 477
 478    Returns true iff the set of available contents match.  Unavailable
 479    contents compare equal with unavailable contents, and different
 480    with any available byte.  For example, if 'x's represent an
 481    unavailable byte, and 'V' and 'Z' represent different available
 482    bytes, in a value with length 16:
 483
 484    offset:   0   4   8   12  16
 485    contents: xxxxVVVVxxxxVVZZ
 486
 487    then:
 488
 489    value_available_contents_eq(val, 0, val, 8, 6) => 1
 490    value_available_contents_eq(val, 0, val, 4, 4) => 1
 491    value_available_contents_eq(val, 0, val, 8, 8) => 0
 492    value_available_contents_eq(val, 4, val, 12, 2) => 1
 493    value_available_contents_eq(val, 4, val, 12, 4) => 0
 494    value_available_contents_eq(val, 3, val, 4, 4) => 0
 495
 496    We only know whether a value chunk is available if we've tried to
 497    read it.  As this routine is used by printing routines, which may
 498    be printing values in the value history, long after the inferior is
 499    gone, it works with const values.  Therefore, this routine must not
 500    be called with lazy values.  */
 501
 502 extern int value_available_contents_eq (const struct value *val1, int offset1,
 503                                         const struct value *val2, int offset2,
 504                                         int length);
 505
 506 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 507    is (or will be copied to) VAL's contents buffer offset by
 508    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 509    Marks value contents ranges as unavailable if the corresponding
 510    memory is likewise unavailable.  STACK indicates whether the memory
 511    is known to be stack memory.  */
 512
 513 extern void read_value_memory (struct value *val, int embedded_offset,
 514                                int stack, CORE_ADDR memaddr,
 515                                gdb_byte *buffer, size_t length);
 516
 517 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
 518    into each element of a new vector value with VECTOR_TYPE.  */
 519
 520 struct value *value_vector_widen (struct value *scalar_value,
 521                                   struct type *vector_type);
 522
 523 \f
 524
 525 #include "symtab.h"
 526 #include "gdbtypes.h"
 527 #include "expression.h"
 528
 529 struct frame_info;
 530 struct fn_field;
 531
 532 extern int print_address_demangle (const struct value_print_options *,
 533                                    struct gdbarch *, CORE_ADDR,
 534                                    struct ui_file *, int);
 535
 536 extern LONGEST value_as_long (struct value *val);
 537 extern DOUBLEST value_as_double (struct value *val);
 538 extern CORE_ADDR value_as_address (struct value *val);
 539
 540 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 541 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 542                                int *invp);
 543 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 544
 545 extern int unpack_value_bits_as_long (struct type *field_type,
 546                                       const gdb_byte *valaddr,
 547                                       int embedded_offset, int bitpos,
 548                                       int bitsize,
 549                                       const struct value *original_value,
 550                                       LONGEST *result);
 551
 552 extern LONGEST unpack_field_as_long (struct type *type,
 553                                      const gdb_byte *valaddr,
 554                                      int fieldno);
 555 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 556                                 int embedded_offset, int fieldno,
 557                                 const struct value *val, LONGEST *result);
 558
 559 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 560                                            const gdb_byte *valaddr,
 561                                            int embedded_offset,
 562                                            const struct value *val);
 563
 564 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 565
 566 extern struct value *value_from_longest (struct type *type, LONGEST num);
 567 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 568 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 569 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 570 extern struct value *value_from_decfloat (struct type *type,
 571                                           const gdb_byte *decbytes);
 572 extern struct value *value_from_history_ref (char *, char **);
 573
 574 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 575 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 576
 577 extern struct value *value_from_contents_and_address (struct type *,
 578                                                       const gdb_byte *,
 579                                                       CORE_ADDR);
 580 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 581
 582 extern struct value *default_value_from_register (struct gdbarch *gdbarch,
 583                                                   struct type *type,
 584                                                   int regnum,
 585                                                   struct frame_id frame_id);
 586
 587 extern void read_frame_register_value (struct value *value,
 588                                        struct frame_info *frame);
 589
 590 extern struct value *value_from_register (struct type *type, int regnum,
 591                                           struct frame_info *frame);
 592
 593 extern CORE_ADDR address_from_register (int regnum,
 594                                         struct frame_info *frame);
 595
 596 extern struct value *value_of_variable (struct symbol *var,
 597                                         const struct block *b);
 598
 599 extern struct value *address_of_variable (struct symbol *var,
 600                                           const struct block *b);
 601
 602 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 603
 604 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 605
 606 extern int symbol_read_needs_frame (struct symbol *);
 607
 608 extern struct value *read_var_value (struct symbol *var,
 609                                      struct frame_info *frame);
 610
 611 extern struct value *default_read_var_value (struct symbol *var,
 612                                              struct frame_info *frame);
 613
 614 extern struct value *allocate_value (struct type *type);
 615 extern struct value *allocate_value_lazy (struct type *type);
 616 extern void value_contents_copy (struct value *dst, int dst_offset,
 617                                  struct value *src, int src_offset,
 618                                  int length);
 619 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 620                                      struct value *src, int src_offset,
 621                                      int length);
 622
 623 extern struct value *allocate_repeat_value (struct type *type, int count);
 624
 625 extern struct value *value_mark (void);
 626
 627 extern void value_free_to_mark (struct value *mark);
 628
 629 extern struct value *value_cstring (char *ptr, ssize_t len,
 630                                     struct type *char_type);
 631 extern struct value *value_string (char *ptr, ssize_t len,
 632                                    struct type *char_type);
 633
 634 extern struct value *value_array (int lowbound, int highbound,
 635                                   struct value **elemvec);
 636
 637 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 638
 639 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 640                                   enum exp_opcode op);
 641
 642 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 643
 644 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 645
 646 extern int value_must_coerce_to_target (struct value *arg1);
 647
 648 extern struct value *value_coerce_to_target (struct value *arg1);
 649
 650 extern struct value *value_coerce_array (struct value *arg1);
 651
 652 extern struct value *value_coerce_function (struct value *arg1);
 653
 654 extern struct value *value_ind (struct value *arg1);
 655
 656 extern struct value *value_addr (struct value *arg1);
 657
 658 extern struct value *value_ref (struct value *arg1);
 659
 660 extern struct value *value_assign (struct value *toval,
 661                                    struct value *fromval);
 662
 663 extern struct value *value_pos (struct value *arg1);
 664
 665 extern struct value *value_neg (struct value *arg1);
 666
 667 extern struct value *value_complement (struct value *arg1);
 668
 669 extern struct value *value_struct_elt (struct value **argp,
 670                                        struct value **args,
 671                                        const char *name, int *static_memfuncp,
 672                                        const char *err);
 673
 674 extern struct value *value_struct_elt_bitpos (struct value **argp,
 675                                               int bitpos,
 676                                               struct type *field_type,
 677                                               const char *err);
 678
 679 extern struct value *value_aggregate_elt (struct type *curtype,
 680                                           const char *name,
 681                                           struct type *expect_type,
 682                                           int want_address,
 683                                           enum noside noside);
 684
 685 extern struct value *value_static_field (struct type *type, int fieldno);
 686
 687 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 688
 689 extern int find_overload_match (struct value **args, int nargs,
 690                                 const char *name,
 691                                 enum oload_search_type method,
 692                                 struct value **objp, struct symbol *fsym,
 693                                 struct value **valp, struct symbol **symp,
 694                                 int *staticp, const int no_adl);
 695
 696 extern struct value *value_field (struct value *arg1, int fieldno);
 697
 698 extern struct value *value_primitive_field (struct value *arg1, int offset,
 699                                             int fieldno,
 700                                             struct type *arg_type);
 701
 702
 703 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 704                                               int *);
 705
 706 extern struct value *value_full_object (struct value *, struct type *, int,
 707                                         int, int);
 708
 709 extern struct value *value_cast_pointers (struct type *, struct value *, int);
 710
 711 extern struct value *value_cast (struct type *type, struct value *arg2);
 712
 713 extern struct value *value_reinterpret_cast (struct type *type,
 714                                              struct value *arg);
 715
 716 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 717
 718 extern struct value *value_zero (struct type *type, enum lval_type lv);
 719
 720 extern struct value *value_one (struct type *type);
 721
 722 extern struct value *value_repeat (struct value *arg1, int count);
 723
 724 extern struct value *value_subscript (struct value *array, LONGEST index);
 725
 726 extern struct value *value_bitstring_subscript (struct type *type,
 727                                                 struct value *bitstring,
 728                                                 LONGEST index);
 729
 730 extern struct value *register_value_being_returned (struct type *valtype,
 731                                                     struct regcache *retbuf);
 732
 733 extern int value_in (struct value *element, struct value *set);
 734
 735 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 736                             int index);
 737
 738 extern enum return_value_convention
 739 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
 740                           struct type *value_type);
 741
 742 extern int using_struct_return (struct gdbarch *gdbarch,
 743                                 struct value *function,
 744                                 struct type *value_type);
 745
 746 extern struct value *evaluate_expression (struct expression *exp);
 747
 748 extern struct value *evaluate_type (struct expression *exp);
 749
 750 extern struct value *evaluate_subexp (struct type *expect_type,
 751                                       struct expression *exp,
 752                                       int *pos, enum noside noside);
 753
 754 extern struct value *evaluate_subexpression_type (struct expression *exp,
 755                                                   int subexp);
 756
 757 extern void fetch_subexp_value (struct expression *exp, int *pc,
 758                                 struct value **valp, struct value **resultp,
 759                                 struct value **val_chain,
 760                                 int preserve_errors);
 761
 762 extern char *extract_field_op (struct expression *exp, int *subexp);
 763
 764 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 765                                                     int *, enum noside);
 766
 767 extern struct value *parse_and_eval (const char *exp);
 768
 769 extern struct value *parse_to_comma_and_eval (const char **expp);
 770
 771 extern struct type *parse_and_eval_type (char *p, int length);
 772
 773 extern CORE_ADDR parse_and_eval_address (const char *exp);
 774
 775 extern LONGEST parse_and_eval_long (const char *exp);
 776
 777 extern void unop_promote (const struct language_defn *language,
 778                           struct gdbarch *gdbarch,
 779                           struct value **arg1);
 780
 781 extern void binop_promote (const struct language_defn *language,
 782                            struct gdbarch *gdbarch,
 783                            struct value **arg1, struct value **arg2);
 784
 785 extern struct value *access_value_history (int num);
 786
 787 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 788                                            struct internalvar *var);
 789
 790 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 791
 792 extern void set_internalvar (struct internalvar *var, struct value *val);
 793
 794 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 795
 796 extern void set_internalvar_string (struct internalvar *var,
 797                                     const char *string);
 798
 799 extern void clear_internalvar (struct internalvar *var);
 800
 801 extern void set_internalvar_component (struct internalvar *var,
 802                                        int offset,
 803                                        int bitpos, int bitsize,
 804                                        struct value *newvalue);
 805
 806 extern struct internalvar *lookup_only_internalvar (const char *name);
 807
 808 extern struct internalvar *create_internalvar (const char *name);
 809
 810 extern VEC (char_ptr) *complete_internalvar (const char *name);
 811
 812 /* An internalvar can be dynamically computed by supplying a vector of
 813    function pointers to perform various operations.  */
 814
 815 struct internalvar_funcs
 816 {
 817   /* Compute the value of the variable.  The DATA argument passed to
 818      the function is the same argument that was passed to
 819      `create_internalvar_type_lazy'.  */
 820
 821   struct value *(*make_value) (struct gdbarch *arch,
 822                                struct internalvar *var,
 823                                void *data);
 824
 825   /* Update the agent expression EXPR with bytecode to compute the
 826      value.  VALUE is the agent value we are updating.  The DATA
 827      argument passed to this function is the same argument that was
 828      passed to `create_internalvar_type_lazy'.  If this pointer is
 829      NULL, then the internalvar cannot be compiled to an agent
 830      expression.  */
 831
 832   void (*compile_to_ax) (struct internalvar *var,
 833                          struct agent_expr *expr,
 834                          struct axs_value *value,
 835                          void *data);
 836
 837   /* If non-NULL, this is called to destroy DATA.  The DATA argument
 838      passed to this function is the same argument that was passed to
 839      `create_internalvar_type_lazy'.  */
 840
 841   void (*destroy) (void *data);
 842 };
 843
 844 extern struct internalvar *create_internalvar_type_lazy (const char *name,
 845                                 const struct internalvar_funcs *funcs,
 846                                 void *data);
 847
 848 /* Compile an internal variable to an agent expression.  VAR is the
 849    variable to compile; EXPR and VALUE are the agent expression we are
 850    updating.  This will return 0 if there is no known way to compile
 851    VAR, and 1 if VAR was successfully compiled.  It may also throw an
 852    exception on error.  */
 853
 854 extern int compile_internalvar_to_ax (struct internalvar *var,
 855                                       struct agent_expr *expr,
 856                                       struct axs_value *value);
 857
 858 extern struct internalvar *lookup_internalvar (const char *name);
 859
 860 extern int value_equal (struct value *arg1, struct value *arg2);
 861
 862 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 863
 864 extern int value_less (struct value *arg1, struct value *arg2);
 865
 866 extern int value_logical_not (struct value *arg1);
 867
 868 /* C++ */
 869
 870 extern struct value *value_of_this (const struct language_defn *lang);
 871
 872 extern struct value *value_of_this_silent (const struct language_defn *lang);
 873
 874 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 875                                     enum exp_opcode op,
 876                                     enum exp_opcode otherop,
 877                                     enum noside noside);
 878
 879 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 880                                    enum noside noside);
 881
 882 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 883                                      int j, struct type *type, int offset);
 884
 885 extern int binop_types_user_defined_p (enum exp_opcode op,
 886                                        struct type *type1,
 887                                        struct type *type2);
 888
 889 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 890                                  struct value *arg2);
 891
 892 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 893
 894 extern int destructor_name_p (const char *name, struct type *type);
 895
 896 extern void value_incref (struct value *val);
 897
 898 extern void value_free (struct value *val);
 899
 900 extern void free_all_values (void);
 901
 902 extern void free_value_chain (struct value *v);
 903
 904 extern void release_value (struct value *val);
 905
 906 extern void release_value_or_incref (struct value *val);
 907
 908 extern int record_latest_value (struct value *val);
 909
 910 extern void modify_field (struct type *type, gdb_byte *addr,
 911                           LONGEST fieldval, int bitpos, int bitsize);
 912
 913 extern void type_print (struct type *type, const char *varstring,
 914                         struct ui_file *stream, int show);
 915
 916 extern char *type_to_string (struct type *type);
 917
 918 extern gdb_byte *baseclass_addr (struct type *type, int index,
 919                                  gdb_byte *valaddr,
 920                                  struct value **valuep, int *errp);
 921
 922 extern void print_longest (struct ui_file *stream, int format,
 923                            int use_local, LONGEST val);
 924
 925 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 926                             struct ui_file *stream);
 927
 928 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 929                                     struct ui_file *stream);
 930
 931 extern void value_print (struct value *val, struct ui_file *stream,
 932                          const struct value_print_options *options);
 933
 934 extern void value_print_array_elements (struct value *val,
 935                                         struct ui_file *stream, int format,
 936                                         enum val_prettyformat pretty);
 937
 938 extern struct value *value_release_to_mark (struct value *mark);
 939
 940 extern void val_print (struct type *type, const gdb_byte *valaddr,
 941                        int embedded_offset, CORE_ADDR address,
 942                        struct ui_file *stream, int recurse,
 943                        const struct value *val,
 944                        const struct value_print_options *options,
 945                        const struct language_defn *language);
 946
 947 extern void common_val_print (struct value *val,
 948                               struct ui_file *stream, int recurse,
 949                               const struct value_print_options *options,
 950                               const struct language_defn *language);
 951
 952 extern int val_print_string (struct type *elttype, const char *encoding,
 953                              CORE_ADDR addr, int len,
 954                              struct ui_file *stream,
 955                              const struct value_print_options *options);
 956
 957 extern void print_variable_and_value (const char *name,
 958                                       struct symbol *var,
 959                                       struct frame_info *frame,
 960                                       struct ui_file *stream,
 961                                       int indent);
 962
 963 extern void typedef_print (struct type *type, struct symbol *news,
 964                            struct ui_file *stream);
 965
 966 extern char *internalvar_name (struct internalvar *var);
 967
 968 extern void preserve_values (struct objfile *);
 969
 970 /* From values.c */
 971
 972 extern struct value *value_copy (struct value *);
 973
 974 extern struct value *value_non_lval (struct value *);
 975
 976 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 977
 978 /* From valops.c */
 979
 980 extern struct value *varying_to_slice (struct value *);
 981
 982 extern struct value *value_slice (struct value *, int, int);
 983
 984 extern struct value *value_literal_complex (struct value *, struct value *,
 985                                             struct type *);
 986
 987 extern struct value *find_function_in_inferior (const char *,
 988                                                 struct objfile **);
 989
 990 extern struct value *value_allocate_space_in_inferior (int);
 991
 992 extern struct value *value_subscripted_rvalue (struct value *array,
 993                                                LONGEST index, int lowerbound);
 994
 995 /* User function handler.  */
 996
 997 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 998                                                const struct language_defn *language,
 999                                                void *cookie,
1000                                                int argc,
1001                                                struct value **argv);
1002
1003 void add_internal_function (const char *name, const char *doc,
1004                             internal_function_fn handler,
1005                             void *cookie);
1006
1007 struct value *call_internal_function (struct gdbarch *gdbarch,
1008                                       const struct language_defn *language,
1009                                       struct value *function,
1010                                       int argc, struct value **argv);
1011
1012 char *value_internal_function_name (struct value *);
1013
1014 #endif /* !defined (VALUE_H) */