value.h revision 1.1.1.1
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); 522 523 524 526 #include "symtab.h" 527 #include "gdbtypes.h" 528 #include "expression.h" 529 530 struct frame_info; 531 struct fn_field; 532 533 extern int print_address_demangle (const struct value_print_options *, 534 struct gdbarch *, CORE_ADDR, 535 struct ui_file *, int); 536 537 extern LONGEST value_as_long (struct value *val); 538 extern DOUBLEST value_as_double (struct value *val); 539 extern CORE_ADDR value_as_address (struct value *val); 540 541 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr); 542 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr, 543 int *invp); 544 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr); 545 546 extern int unpack_value_bits_as_long (struct type *field_type, 547 const gdb_byte *valaddr, 548 int embedded_offset, int bitpos, 549 int bitsize, 550 const struct value *original_value, 551 LONGEST *result); 552 553 extern LONGEST unpack_field_as_long (struct type *type, 554 const gdb_byte *valaddr, 555 int fieldno); 556 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr, 557 int embedded_offset, int fieldno, 558 const struct value *val, LONGEST *result); 559 560 extern struct value *value_field_bitfield (struct type *type, int fieldno, 561 const gdb_byte *valaddr, 562 int embedded_offset, 563 const struct value *val); 564 565 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num); 566 567 extern struct value *value_from_longest (struct type *type, LONGEST num); 568 extern struct value *value_from_ulongest (struct type *type, ULONGEST num); 569 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr); 570 extern struct value *value_from_double (struct type *type, DOUBLEST num); 571 extern struct value *value_from_decfloat (struct type *type, 572 const gdb_byte *decbytes); 573 extern struct value *value_from_history_ref (char *, char **); 574 575 extern struct value *value_at (struct type *type, CORE_ADDR addr); 576 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr); 577 578 extern struct value *value_from_contents_and_address (struct type *, 579 const gdb_byte *, 580 CORE_ADDR); 581 extern struct value *value_from_contents (struct type *, const gdb_byte *); 582 583 extern struct value *default_value_from_register (struct type *type, 584 int regnum, 585 struct frame_info *frame); 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 (struct type *type, 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 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) */ 1015
Indexes created Sun Mar 01 05:31:48 UTC 2026