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 /* value_contents() and value_contents_raw() both return the address
 277    of the gdb buffer used to hold a copy of the contents of the lval.
 278    value_contents() is used when the contents of the buffer are needed
 279    -- it uses value_fetch_lazy() to load the buffer from the process
 280    being debugged if it hasn't already been loaded
 281    (value_contents_writeable() is used when a writeable but fetched
 282    buffer is required)..  value_contents_raw() is used when data is
 283    being stored into the buffer, or when it is certain that the
 284    contents of the buffer are valid.
 285
 286    Note: The contents pointer is adjusted by the offset required to
 287    get to the real subobject, if the value happens to represent
 288    something embedded in a larger run-time object.  */
 289
 290 extern gdb_byte *value_contents_raw (struct value *);
 291
 292 /* Actual contents of the value.  For use of this value; setting it
 293    uses the stuff above.  Not valid if lazy is nonzero.  Target
 294    byte-order.  We force it to be aligned properly for any possible
 295    value.  Note that a value therefore extends beyond what is
 296    declared here.  */
 297
 298 extern const gdb_byte *value_contents (struct value *);
 299 extern gdb_byte *value_contents_writeable (struct value *);
 300
 301 /* The ALL variants of the above two macros do not adjust the returned
 302    pointer by the embedded_offset value.  */
 303
 304 extern gdb_byte *value_contents_all_raw (struct value *);
 305 extern const gdb_byte *value_contents_all (struct value *);
 306
 307 /* Like value_contents_all, but does not require that the returned
 308    bits be valid.  This should only be used in situations where you
 309    plan to check the validity manually.  */
 310 extern const gdb_byte *value_contents_for_printing (struct value *value);
 311
 312 /* Like value_contents_for_printing, but accepts a constant value
 313    pointer.  Unlike value_contents_for_printing however, the pointed
 314    value must _not_ be lazy.  */
 315 extern const gdb_byte *
 316   value_contents_for_printing_const (const struct value *value);
 317
 318 extern int value_fetch_lazy (struct value *val);
 319 extern int value_contents_equal (struct value *val1, struct value *val2);
 320
 321 /* If nonzero, this is the value of a variable which does not actually
 322    exist in the program, at least partially.  If the value is lazy,
 323    this may fetch it now.  */
 324 extern int value_optimized_out (struct value *value);
 325 extern void set_value_optimized_out (struct value *value, int val);
 326
 327 /* Like value_optimized_out, but don't fetch the value even if it is
 328    lazy.  Mainly useful for constructing other values using VALUE as
 329    template.  */
 330 extern int value_optimized_out_const (const struct value *value);
 331
 332 /* Like value_optimized_out, but return false if any bit in the object
 333    is valid.  */
 334 extern int value_entirely_optimized_out (const struct value *value);
 335
 336 /* Set or return field indicating whether a variable is initialized or
 337    not, based on debugging information supplied by the compiler.
 338    1 = initialized; 0 = uninitialized.  */
 339 extern int value_initialized (struct value *);
 340 extern void set_value_initialized (struct value *, int);
 341
 342 /* Set COMPONENT's location as appropriate for a component of WHOLE
 343    --- regardless of what kind of lvalue WHOLE is.  */
 344 extern void set_value_component_location (struct value *component,
 345                                           const struct value *whole);
 346
 347 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
 348    single value might have multiple LVALs), this hacked interface is
 349    limited to just the first PIECE.  Expect further change.  */
 350 /* Type of value; either not an lval, or one of the various different
 351    possible kinds of lval.  */
 352 extern enum lval_type *deprecated_value_lval_hack (struct value *);
 353 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
 354
 355 /* Like VALUE_LVAL, except the parameter can be const.  */
 356 extern enum lval_type value_lval_const (const struct value *value);
 357
 358 /* If lval == lval_memory, return the address in the inferior.  If
 359    lval == lval_register, return the byte offset into the registers
 360    structure.  Otherwise, return 0.  The returned address
 361    includes the offset, if any.  */
 362 extern CORE_ADDR value_address (const struct value *);
 363
 364 /* Like value_address, except the result does not include value's
 365    offset.  */
 366 extern CORE_ADDR value_raw_address (struct value *);
 367
 368 /* Set the address of a value.  */
 369 extern void set_value_address (struct value *, CORE_ADDR);
 370
 371 /* Pointer to internal variable.  */
 372 extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
 373 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
 374
 375 /* Frame register value is relative to.  This will be described in the
 376    lval enum above as "lval_register".  */
 377 extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
 378 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
 379
 380 /* Register number if the value is from a register.  */
 381 extern short *deprecated_value_regnum_hack (struct value *);
 382 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
 383
 384 /* Return value after lval_funcs->coerce_ref (after check_typedef).  Return
 385    NULL if lval_funcs->coerce_ref is not applicable for whatever reason.  */
 386
 387 extern struct value *coerce_ref_if_computed (const struct value *arg);
 388
 389 /* Setup a new value type and enclosing value type for dereferenced value VALUE.
 390    ENC_TYPE is the new enclosing type that should be set.  ORIGINAL_TYPE and
 391    ORIGINAL_VAL are the type and value of the original reference or pointer.
 392
 393    Note, that VALUE is modified by this function.
 394
 395    It is a common implementation for coerce_ref and value_ind.  */
 396
 397 extern struct value * readjust_indirect_value_type (struct value *value,
 398                                                     struct type *enc_type,
 399                                                     struct type *original_type,
 400                                                     struct value *original_val);
 401
 402 /* Convert a REF to the object referenced.  */
 403
 404 extern struct value *coerce_ref (struct value *value);
 405
 406 /* If ARG is an array, convert it to a pointer.
 407    If ARG is a function, convert it to a function pointer.
 408
 409    References are dereferenced.  */
 410
 411 extern struct value *coerce_array (struct value *value);
 412
 413 /* Given a value, determine whether the bits starting at OFFSET and
 414    extending for LENGTH bits are valid.  This returns nonzero if all
 415    bits in the given range are valid, zero if any bit is invalid.  */
 416
 417 extern int value_bits_valid (const struct value *value,
 418                              int offset, int length);
 419
 420 /* Given a value, determine whether the bits starting at OFFSET and
 421    extending for LENGTH bits are a synthetic pointer.  */
 422
 423 extern int value_bits_synthetic_pointer (const struct value *value,
 424                                          int offset, int length);
 425
 426 /* Given a value, determine whether the contents bytes starting at
 427    OFFSET and extending for LENGTH bytes are available.  This returns
 428    nonzero if all bytes in the given range are available, zero if any
 429    byte is unavailable.  */
 430
 431 extern int value_bytes_available (const struct value *value,
 432                                   int offset, int length);
 433
 434 /* Like value_bytes_available, but return false if any byte in the
 435    whole object is unavailable.  */
 436 extern int value_entirely_available (struct value *value);
 437
 438 /* Like value_entirely_available, but return false if any byte in the
 439    whole object is available.  */
 440 extern int value_entirely_unavailable (struct value *value);
 441
 442 /* Mark VALUE's content bytes starting at OFFSET and extending for
 443    LENGTH bytes as unavailable.  */
 444
 445 extern void mark_value_bytes_unavailable (struct value *value,
 446                                           int offset, int length);
 447
 448 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with
 449    LENGTH bytes of VAL2's contents starting at OFFSET2.
 450
 451    Note that "contents" refers to the whole value's contents
 452    (value_contents_all), without any embedded offset adjustment.  For
 453    example, to compare a complete object value with itself, including
 454    its enclosing type chunk, you'd do:
 455
 456      int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
 457      value_available_contents (val, 0, val, 0, len);
 458
 459    Returns true iff the set of available contents match.  Unavailable
 460    contents compare equal with unavailable contents, and different
 461    with any available byte.  For example, if 'x's represent an
 462    unavailable byte, and 'V' and 'Z' represent different available
 463    bytes, in a value with length 16:
 464
 465    offset:   0   4   8   12  16
 466    contents: xxxxVVVVxxxxVVZZ
 467
 468    then:
 469
 470    value_available_contents_eq(val, 0, val, 8, 6) => 1
 471    value_available_contents_eq(val, 0, val, 4, 4) => 1
 472    value_available_contents_eq(val, 0, val, 8, 8) => 0
 473    value_available_contents_eq(val, 4, val, 12, 2) => 1
 474    value_available_contents_eq(val, 4, val, 12, 4) => 0
 475    value_available_contents_eq(val, 3, val, 4, 4) => 0
 476
 477    We only know whether a value chunk is available if we've tried to
 478    read it.  As this routine is used by printing routines, which may
 479    be printing values in the value history, long after the inferior is
 480    gone, it works with const values.  Therefore, this routine must not
 481    be called with lazy values.  */
 482
 483 extern int value_available_contents_eq (const struct value *val1, int offset1,
 484                                         const struct value *val2, int offset2,
 485                                         int length);
 486
 487 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which
 488    is (or will be copied to) VAL's contents buffer offset by
 489    EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]).
 490    Marks value contents ranges as unavailable if the corresponding
 491    memory is likewise unavailable.  STACK indicates whether the memory
 492    is known to be stack memory.  */
 493
 494 extern void read_value_memory (struct value *val, int embedded_offset,
 495                                int stack, CORE_ADDR memaddr,
 496                                gdb_byte *buffer, size_t length);
 497
 498 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate
 499    into each element of a new vector value with VECTOR_TYPE.  */
 500
 501 struct value *value_vector_widen (struct value *scalar_value,
 502                                   struct type *vector_type);
 503
 504 \f
 505
 506 #include "symtab.h"
 507 #include "gdbtypes.h"
 508 #include "expression.h"
 509
 510 struct frame_info;
 511 struct fn_field;
 512
 513 extern int print_address_demangle (const struct value_print_options *,
 514                                    struct gdbarch *, CORE_ADDR,
 515                                    struct ui_file *, int);
 516
 517 extern LONGEST value_as_long (struct value *val);
 518 extern DOUBLEST value_as_double (struct value *val);
 519 extern CORE_ADDR value_as_address (struct value *val);
 520
 521 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
 522 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
 523                                int *invp);
 524 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
 525
 526 extern int unpack_value_bits_as_long (struct type *field_type,
 527                                       const gdb_byte *valaddr,
 528                                       int embedded_offset, int bitpos,
 529                                       int bitsize,
 530                                       const struct value *original_value,
 531                                       LONGEST *result);
 532
 533 extern LONGEST unpack_field_as_long (struct type *type,
 534                                      const gdb_byte *valaddr,
 535                                      int fieldno);
 536 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
 537                                 int embedded_offset, int fieldno,
 538                                 const struct value *val, LONGEST *result);
 539
 540 extern struct value *value_field_bitfield (struct type *type, int fieldno,
 541                                            const gdb_byte *valaddr,
 542                                            int embedded_offset,
 543                                            const struct value *val);
 544
 545 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
 546
 547 extern struct value *value_from_longest (struct type *type, LONGEST num);
 548 extern struct value *value_from_ulongest (struct type *type, ULONGEST num);
 549 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
 550 extern struct value *value_from_double (struct type *type, DOUBLEST num);
 551 extern struct value *value_from_decfloat (struct type *type,
 552                                           const gdb_byte *decbytes);
 553 extern struct value *value_from_history_ref (char *, char **);
 554
 555 extern struct value *value_at (struct type *type, CORE_ADDR addr);
 556 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
 557
 558 extern struct value *value_from_contents_and_address (struct type *,
 559                                                       const gdb_byte *,
 560                                                       CORE_ADDR);
 561 extern struct value *value_from_contents (struct type *, const gdb_byte *);
 562
 563 extern struct value *default_value_from_register (struct type *type,
 564                                                   int regnum,
 565                                                   struct frame_info *frame);
 566
 567 extern void read_frame_register_value (struct value *value,
 568                                        struct frame_info *frame);
 569
 570 extern struct value *value_from_register (struct type *type, int regnum,
 571                                           struct frame_info *frame);
 572
 573 extern CORE_ADDR address_from_register (struct type *type, int regnum,
 574                                         struct frame_info *frame);
 575
 576 extern struct value *value_of_variable (struct symbol *var,
 577                                         const struct block *b);
 578
 579 extern struct value *address_of_variable (struct symbol *var,
 580                                           const struct block *b);
 581
 582 extern struct value *value_of_register (int regnum, struct frame_info *frame);
 583
 584 struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
 585
 586 extern int symbol_read_needs_frame (struct symbol *);
 587
 588 extern struct value *read_var_value (struct symbol *var,
 589                                      struct frame_info *frame);
 590
 591 extern struct value *default_read_var_value (struct symbol *var,
 592                                              struct frame_info *frame);
 593
 594 extern struct value *allocate_value (struct type *type);
 595 extern struct value *allocate_value_lazy (struct type *type);
 596 extern void value_contents_copy (struct value *dst, int dst_offset,
 597                                  struct value *src, int src_offset,
 598                                  int length);
 599 extern void value_contents_copy_raw (struct value *dst, int dst_offset,
 600                                      struct value *src, int src_offset,
 601                                      int length);
 602
 603 extern struct value *allocate_repeat_value (struct type *type, int count);
 604
 605 extern struct value *value_mark (void);
 606
 607 extern void value_free_to_mark (struct value *mark);
 608
 609 extern struct value *value_cstring (char *ptr, ssize_t len,
 610                                     struct type *char_type);
 611 extern struct value *value_string (char *ptr, ssize_t len,
 612                                    struct type *char_type);
 613
 614 extern struct value *value_array (int lowbound, int highbound,
 615                                   struct value **elemvec);
 616
 617 extern struct value *value_concat (struct value *arg1, struct value *arg2);
 618
 619 extern struct value *value_binop (struct value *arg1, struct value *arg2,
 620                                   enum exp_opcode op);
 621
 622 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2);
 623
 624 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
 625
 626 extern int value_must_coerce_to_target (struct value *arg1);
 627
 628 extern struct value *value_coerce_to_target (struct value *arg1);
 629
 630 extern struct value *value_coerce_array (struct value *arg1);
 631
 632 extern struct value *value_coerce_function (struct value *arg1);
 633
 634 extern struct value *value_ind (struct value *arg1);
 635
 636 extern struct value *value_addr (struct value *arg1);
 637
 638 extern struct value *value_ref (struct value *arg1);
 639
 640 extern struct value *value_assign (struct value *toval,
 641                                    struct value *fromval);
 642
 643 extern struct value *value_pos (struct value *arg1);
 644
 645 extern struct value *value_neg (struct value *arg1);
 646
 647 extern struct value *value_complement (struct value *arg1);
 648
 649 extern struct value *value_struct_elt (struct value **argp,
 650                                        struct value **args,
 651                                        const char *name, int *static_memfuncp,
 652                                        const char *err);
 653
 654 extern struct value *value_aggregate_elt (struct type *curtype,
 655                                           char *name,
 656                                           struct type *expect_type,
 657                                           int want_address,
 658                                           enum noside noside);
 659
 660 extern struct value *value_static_field (struct type *type, int fieldno);
 661
 662 enum oload_search_type { NON_METHOD, METHOD, BOTH };
 663
 664 extern int find_overload_match (struct value **args, int nargs,
 665                                 const char *name,
 666                                 enum oload_search_type method,
 667                                 struct value **objp, struct symbol *fsym,
 668                                 struct value **valp, struct symbol **symp,
 669                                 int *staticp, const int no_adl);
 670
 671 extern struct value *value_field (struct value *arg1, int fieldno);
 672
 673 extern struct value *value_primitive_field (struct value *arg1, int offset,
 674                                             int fieldno,
 675                                             struct type *arg_type);
 676
 677
 678 extern struct type *value_rtti_indirect_type (struct value *, int *, int *,
 679                                               int *);
 680
 681 extern struct value *value_full_object (struct value *, struct type *, int,
 682                                         int, int);
 683
 684 extern struct value *value_cast_pointers (struct type *, struct value *, int);
 685
 686 extern struct value *value_cast (struct type *type, struct value *arg2);
 687
 688 extern struct value *value_reinterpret_cast (struct type *type,
 689                                              struct value *arg);
 690
 691 extern struct value *value_dynamic_cast (struct type *type, struct value *arg);
 692
 693 extern struct value *value_zero (struct type *type, enum lval_type lv);
 694
 695 extern struct value *value_one (struct type *type);
 696
 697 extern struct value *value_repeat (struct value *arg1, int count);
 698
 699 extern struct value *value_subscript (struct value *array, LONGEST index);
 700
 701 extern struct value *value_bitstring_subscript (struct type *type,
 702                                                 struct value *bitstring,
 703                                                 LONGEST index);
 704
 705 extern struct value *register_value_being_returned (struct type *valtype,
 706                                                     struct regcache *retbuf);
 707
 708 extern int value_in (struct value *element, struct value *set);
 709
 710 extern int value_bit_index (struct type *type, const gdb_byte *addr,
 711                             int index);
 712
 713 extern enum return_value_convention
 714 struct_return_convention (struct gdbarch *gdbarch, struct value *function,
 715                           struct type *value_type);
 716
 717 extern int using_struct_return (struct gdbarch *gdbarch,
 718                                 struct value *function,
 719                                 struct type *value_type);
 720
 721 extern struct value *evaluate_expression (struct expression *exp);
 722
 723 extern struct value *evaluate_type (struct expression *exp);
 724
 725 extern struct value *evaluate_subexp (struct type *expect_type,
 726                                       struct expression *exp,
 727                                       int *pos, enum noside noside);
 728
 729 extern struct value *evaluate_subexpression_type (struct expression *exp,
 730                                                   int subexp);
 731
 732 extern void fetch_subexp_value (struct expression *exp, int *pc,
 733                                 struct value **valp, struct value **resultp,
 734                                 struct value **val_chain,
 735                                 int preserve_errors);
 736
 737 extern char *extract_field_op (struct expression *exp, int *subexp);
 738
 739 extern struct value *evaluate_subexp_with_coercion (struct expression *,
 740                                                     int *, enum noside);
 741
 742 extern struct value *parse_and_eval (const char *exp);
 743
 744 extern struct value *parse_to_comma_and_eval (const char **expp);
 745
 746 extern struct type *parse_and_eval_type (char *p, int length);
 747
 748 extern CORE_ADDR parse_and_eval_address (const char *exp);
 749
 750 extern LONGEST parse_and_eval_long (const char *exp);
 751
 752 extern void unop_promote (const struct language_defn *language,
 753                           struct gdbarch *gdbarch,
 754                           struct value **arg1);
 755
 756 extern void binop_promote (const struct language_defn *language,
 757                            struct gdbarch *gdbarch,
 758                            struct value **arg1, struct value **arg2);
 759
 760 extern struct value *access_value_history (int num);
 761
 762 extern struct value *value_of_internalvar (struct gdbarch *gdbarch,
 763                                            struct internalvar *var);
 764
 765 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l);
 766
 767 extern void set_internalvar (struct internalvar *var, struct value *val);
 768
 769 extern void set_internalvar_integer (struct internalvar *var, LONGEST l);
 770
 771 extern void set_internalvar_string (struct internalvar *var,
 772                                     const char *string);
 773
 774 extern void clear_internalvar (struct internalvar *var);
 775
 776 extern void set_internalvar_component (struct internalvar *var,
 777                                        int offset,
 778                                        int bitpos, int bitsize,
 779                                        struct value *newvalue);
 780
 781 extern struct internalvar *lookup_only_internalvar (const char *name);
 782
 783 extern struct internalvar *create_internalvar (const char *name);
 784
 785 extern VEC (char_ptr) *complete_internalvar (const char *name);
 786
 787 /* An internalvar can be dynamically computed by supplying a vector of
 788    function pointers to perform various operations.  */
 789
 790 struct internalvar_funcs
 791 {
 792   /* Compute the value of the variable.  The DATA argument passed to
 793      the function is the same argument that was passed to
 794      `create_internalvar_type_lazy'.  */
 795
 796   struct value *(*make_value) (struct gdbarch *arch,
 797                                struct internalvar *var,
 798                                void *data);
 799
 800   /* Update the agent expression EXPR with bytecode to compute the
 801      value.  VALUE is the agent value we are updating.  The DATA
 802      argument passed to this function is the same argument that was
 803      passed to `create_internalvar_type_lazy'.  If this pointer is
 804      NULL, then the internalvar cannot be compiled to an agent
 805      expression.  */
 806
 807   void (*compile_to_ax) (struct internalvar *var,
 808                          struct agent_expr *expr,
 809                          struct axs_value *value,
 810                          void *data);
 811
 812   /* If non-NULL, this is called to destroy DATA.  The DATA argument
 813      passed to this function is the same argument that was passed to
 814      `create_internalvar_type_lazy'.  */
 815
 816   void (*destroy) (void *data);
 817 };
 818
 819 extern struct internalvar *create_internalvar_type_lazy (const char *name,
 820                                 const struct internalvar_funcs *funcs,
 821                                 void *data);
 822
 823 /* Compile an internal variable to an agent expression.  VAR is the
 824    variable to compile; EXPR and VALUE are the agent expression we are
 825    updating.  This will return 0 if there is no known way to compile
 826    VAR, and 1 if VAR was successfully compiled.  It may also throw an
 827    exception on error.  */
 828
 829 extern int compile_internalvar_to_ax (struct internalvar *var,
 830                                       struct agent_expr *expr,
 831                                       struct axs_value *value);
 832
 833 extern struct internalvar *lookup_internalvar (const char *name);
 834
 835 extern int value_equal (struct value *arg1, struct value *arg2);
 836
 837 extern int value_equal_contents (struct value *arg1, struct value *arg2);
 838
 839 extern int value_less (struct value *arg1, struct value *arg2);
 840
 841 extern int value_logical_not (struct value *arg1);
 842
 843 /* C++ */
 844
 845 extern struct value *value_of_this (const struct language_defn *lang);
 846
 847 extern struct value *value_of_this_silent (const struct language_defn *lang);
 848
 849 extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
 850                                     enum exp_opcode op,
 851                                     enum exp_opcode otherop,
 852                                     enum noside noside);
 853
 854 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
 855                                    enum noside noside);
 856
 857 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
 858                                      int j, struct type *type, int offset);
 859
 860 extern int binop_types_user_defined_p (enum exp_opcode op,
 861                                        struct type *type1,
 862                                        struct type *type2);
 863
 864 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
 865                                  struct value *arg2);
 866
 867 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
 868
 869 extern int destructor_name_p (const char *name, struct type *type);
 870
 871 extern void value_incref (struct value *val);
 872
 873 extern void value_free (struct value *val);
 874
 875 extern void free_all_values (void);
 876
 877 extern void free_value_chain (struct value *v);
 878
 879 extern void release_value (struct value *val);
 880
 881 extern void release_value_or_incref (struct value *val);
 882
 883 extern int record_latest_value (struct value *val);
 884
 885 extern void modify_field (struct type *type, gdb_byte *addr,
 886                           LONGEST fieldval, int bitpos, int bitsize);
 887
 888 extern void type_print (struct type *type, const char *varstring,
 889                         struct ui_file *stream, int show);
 890
 891 extern char *type_to_string (struct type *type);
 892
 893 extern gdb_byte *baseclass_addr (struct type *type, int index,
 894                                  gdb_byte *valaddr,
 895                                  struct value **valuep, int *errp);
 896
 897 extern void print_longest (struct ui_file *stream, int format,
 898                            int use_local, LONGEST val);
 899
 900 extern void print_floating (const gdb_byte *valaddr, struct type *type,
 901                             struct ui_file *stream);
 902
 903 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
 904                                     struct ui_file *stream);
 905
 906 extern void value_print (struct value *val, struct ui_file *stream,
 907                          const struct value_print_options *options);
 908
 909 extern void value_print_array_elements (struct value *val,
 910                                         struct ui_file *stream, int format,
 911                                         enum val_prettyformat pretty);
 912
 913 extern struct value *value_release_to_mark (struct value *mark);
 914
 915 extern void val_print (struct type *type, const gdb_byte *valaddr,
 916                        int embedded_offset, CORE_ADDR address,
 917                        struct ui_file *stream, int recurse,
 918                        const struct value *val,
 919                        const struct value_print_options *options,
 920                        const struct language_defn *language);
 921
 922 extern void common_val_print (struct value *val,
 923                               struct ui_file *stream, int recurse,
 924                               const struct value_print_options *options,
 925                               const struct language_defn *language);
 926
 927 extern int val_print_string (struct type *elttype, const char *encoding,
 928                              CORE_ADDR addr, int len,
 929                              struct ui_file *stream,
 930                              const struct value_print_options *options);
 931
 932 extern void print_variable_and_value (const char *name,
 933                                       struct symbol *var,
 934                                       struct frame_info *frame,
 935                                       struct ui_file *stream,
 936                                       int indent);
 937
 938 extern void typedef_print (struct type *type, struct symbol *news,
 939                            struct ui_file *stream);
 940
 941 extern char *internalvar_name (struct internalvar *var);
 942
 943 extern void preserve_values (struct objfile *);
 944
 945 /* From values.c */
 946
 947 extern struct value *value_copy (struct value *);
 948
 949 extern struct value *value_non_lval (struct value *);
 950
 951 extern void preserve_one_value (struct value *, struct objfile *, htab_t);
 952
 953 /* From valops.c */
 954
 955 extern struct value *varying_to_slice (struct value *);
 956
 957 extern struct value *value_slice (struct value *, int, int);
 958
 959 extern struct value *value_literal_complex (struct value *, struct value *,
 960                                             struct type *);
 961
 962 extern struct value *find_function_in_inferior (const char *,
 963                                                 struct objfile **);
 964
 965 extern struct value *value_allocate_space_in_inferior (int);
 966
 967 extern struct value *value_subscripted_rvalue (struct value *array,
 968                                                LONGEST index, int lowerbound);
 969
 970 /* User function handler.  */
 971
 972 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch,
 973                                                const struct language_defn *language,
 974                                                void *cookie,
 975                                                int argc,
 976                                                struct value **argv);
 977
 978 void add_internal_function (const char *name, const char *doc,
 979                             internal_function_fn handler,
 980                             void *cookie);
 981
 982 struct value *call_internal_function (struct gdbarch *gdbarch,
 983                                       const struct language_defn *language,
 984                                       struct value *function,
 985                                       int argc, struct value **argv);
 986
 987 char *value_internal_function_name (struct value *);
 988
 989 #endif /* !defined (VALUE_H) */