| 1 | /* Definitions for values of C expressions, for GDB. |
| 2 | Copyright 1986, 1987, 1989, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #if !defined (VALUE_H) |
| 21 | #define VALUE_H 1 |
| 22 | |
| 23 | /* |
| 24 | * The structure which defines the type of a value. It should never |
| 25 | * be possible for a program lval value to survive over a call to the inferior |
| 26 | * (ie to be put into the history list or an internal variable). |
| 27 | */ |
| 28 | enum lval_type { |
| 29 | /* Not an lval. */ |
| 30 | not_lval, |
| 31 | /* In memory. Could be a saved register. */ |
| 32 | lval_memory, |
| 33 | /* In a register. */ |
| 34 | lval_register, |
| 35 | /* In a gdb internal variable. */ |
| 36 | lval_internalvar, |
| 37 | /* Part of a gdb internal variable (structure field). */ |
| 38 | lval_internalvar_component, |
| 39 | /* In a register series in a frame not the current one, which may have been |
| 40 | partially saved or saved in different places (otherwise would be |
| 41 | lval_register or lval_memory). */ |
| 42 | lval_reg_frame_relative |
| 43 | }; |
| 44 | |
| 45 | struct value |
| 46 | { |
| 47 | /* Type of value; either not an lval, or one of the various |
| 48 | different possible kinds of lval. */ |
| 49 | enum lval_type lval; |
| 50 | /* Location of value (if lval). */ |
| 51 | union |
| 52 | { |
| 53 | /* Address in inferior or byte of registers structure. */ |
| 54 | CORE_ADDR address; |
| 55 | /* Pointer to internal variable. */ |
| 56 | struct internalvar *internalvar; |
| 57 | /* Number of register. Only used with |
| 58 | lval_reg_frame_relative. */ |
| 59 | int regnum; |
| 60 | } location; |
| 61 | /* Describes offset of a value within lval a structure in bytes. */ |
| 62 | int offset; |
| 63 | /* Only used for bitfields; number of bits contained in them. */ |
| 64 | int bitsize; |
| 65 | /* Only used for bitfields; position of start of field. |
| 66 | For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB. |
| 67 | For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */ |
| 68 | int bitpos; |
| 69 | /* Frame value is relative to. In practice, this address is only |
| 70 | used if the value is stored in several registers in other than |
| 71 | the current frame, and these registers have not all been saved |
| 72 | at the same place in memory. This will be described in the |
| 73 | lval enum above as "lval_reg_frame_relative". */ |
| 74 | CORE_ADDR frame_addr; |
| 75 | /* Type of the value. */ |
| 76 | struct type *type; |
| 77 | /* Values are stored in a chain, so that they can be deleted |
| 78 | easily over calls to the inferior. Values assigned to internal |
| 79 | variables or put into the value history are taken off this |
| 80 | list. */ |
| 81 | struct value *next; |
| 82 | /* If an lval is forced to repeat, a new value is created with |
| 83 | these fields set. The new value is not an lval. */ |
| 84 | short repeated; |
| 85 | short repetitions; |
| 86 | /* Register number if the value is from a register. Is not kept |
| 87 | if you take a field of a structure that is stored in a |
| 88 | register. Shouldn't it be? */ |
| 89 | short regno; |
| 90 | /* If zero, contents of this value are in the contents field. |
| 91 | If nonzero, contents are in inferior memory at address |
| 92 | in the location.address field plus the offset field |
| 93 | (and the lval field should be lval_memory). */ |
| 94 | char lazy; |
| 95 | /* If nonzero, this is the value of a variable which does not |
| 96 | actually exist in the program. */ |
| 97 | char optimized_out; |
| 98 | /* Actual contents of the value. For use of this value; setting |
| 99 | it uses the stuff above. Not valid if lazy is nonzero. |
| 100 | Target byte-order. We force it to be aligned properly for any |
| 101 | possible value. */ |
| 102 | union { |
| 103 | long contents[1]; |
| 104 | double force_double_align; |
| 105 | #ifdef CC_HAS_LONG_LONG |
| 106 | long long force_longlong_align; |
| 107 | #endif |
| 108 | } aligner; |
| 109 | |
| 110 | }; |
| 111 | |
| 112 | typedef struct value *value; |
| 113 | |
| 114 | #define VALUE_TYPE(val) (val)->type |
| 115 | #define VALUE_LAZY(val) (val)->lazy |
| 116 | /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of |
| 117 | the gdb buffer used to hold a copy of the contents of the lval. |
| 118 | VALUE_CONTENTS is used when the contents of the buffer are needed -- |
| 119 | it uses value_fetch_lazy() to load the buffer from the process being |
| 120 | debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is |
| 121 | used when data is being stored into the buffer, or when it is |
| 122 | certain that the contents of the buffer are valid. */ |
| 123 | #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents) |
| 124 | #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\ |
| 125 | VALUE_CONTENTS_RAW(val)) |
| 126 | extern int |
| 127 | value_fetch_lazy PARAMS ((value val)); |
| 128 | |
| 129 | #define VALUE_LVAL(val) (val)->lval |
| 130 | #define VALUE_ADDRESS(val) (val)->location.address |
| 131 | #define VALUE_INTERNALVAR(val) (val)->location.internalvar |
| 132 | #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum) |
| 133 | #define VALUE_FRAME(val) ((val)->frame_addr) |
| 134 | #define VALUE_OFFSET(val) (val)->offset |
| 135 | #define VALUE_BITSIZE(val) (val)->bitsize |
| 136 | #define VALUE_BITPOS(val) (val)->bitpos |
| 137 | #define VALUE_NEXT(val) (val)->next |
| 138 | #define VALUE_REPEATED(val) (val)->repeated |
| 139 | #define VALUE_REPETITIONS(val) (val)->repetitions |
| 140 | #define VALUE_REGNO(val) (val)->regno |
| 141 | #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out) |
| 142 | |
| 143 | /* Convert a REF to the object referenced. */ |
| 144 | |
| 145 | #define COERCE_REF(arg) \ |
| 146 | { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \ |
| 147 | arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \ |
| 148 | unpack_long (VALUE_TYPE (arg), \ |
| 149 | VALUE_CONTENTS (arg)));} |
| 150 | |
| 151 | /* If ARG is an array, convert it to a pointer. |
| 152 | If ARG is an enum, convert it to an integer. |
| 153 | If ARG is a function, convert it to a function pointer. |
| 154 | |
| 155 | References are dereferenced. */ |
| 156 | |
| 157 | #define COERCE_ARRAY(arg) \ |
| 158 | { COERCE_REF(arg); \ |
| 159 | if (VALUE_REPEATED (arg) \ |
| 160 | || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \ |
| 161 | arg = value_coerce_array (arg); \ |
| 162 | if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \ |
| 163 | arg = value_coerce_function (arg); \ |
| 164 | if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \ |
| 165 | arg = value_cast (builtin_type_unsigned_int, arg); \ |
| 166 | } |
| 167 | |
| 168 | /* If ARG is an enum, convert it to an integer. */ |
| 169 | |
| 170 | #define COERCE_ENUM(arg) \ |
| 171 | { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \ |
| 172 | arg = value_ind (arg); \ |
| 173 | if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \ |
| 174 | arg = value_cast (builtin_type_unsigned_int, arg); \ |
| 175 | } |
| 176 | |
| 177 | /* Internal variables (variables for convenience of use of debugger) |
| 178 | are recorded as a chain of these structures. */ |
| 179 | |
| 180 | struct internalvar |
| 181 | { |
| 182 | struct internalvar *next; |
| 183 | char *name; |
| 184 | value value; |
| 185 | }; |
| 186 | |
| 187 | /* Pointer to member function. Depends on compiler implementation. */ |
| 188 | |
| 189 | #define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000) |
| 190 | #define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET)) |
| 191 | #define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR)) |
| 192 | |
| 193 | \f |
| 194 | #include "symtab.h" |
| 195 | #include "gdbtypes.h" |
| 196 | #include "expression.h" |
| 197 | |
| 198 | #ifdef __STDC__ |
| 199 | struct frame_info; |
| 200 | struct fn_field; |
| 201 | #endif |
| 202 | |
| 203 | extern void |
| 204 | print_address_demangle PARAMS ((CORE_ADDR, FILE *, int)); |
| 205 | |
| 206 | extern LONGEST |
| 207 | value_as_long PARAMS ((value val)); |
| 208 | |
| 209 | extern double |
| 210 | value_as_double PARAMS ((value val)); |
| 211 | |
| 212 | extern CORE_ADDR |
| 213 | value_as_pointer PARAMS ((value val)); |
| 214 | |
| 215 | extern LONGEST |
| 216 | unpack_long PARAMS ((struct type *type, char *valaddr)); |
| 217 | |
| 218 | extern double |
| 219 | unpack_double PARAMS ((struct type *type, char *valaddr, int *invp)); |
| 220 | |
| 221 | extern CORE_ADDR |
| 222 | unpack_pointer PARAMS ((struct type *type, char *valaddr)); |
| 223 | |
| 224 | extern LONGEST |
| 225 | unpack_field_as_long PARAMS ((struct type *type, char *valaddr, |
| 226 | int fieldno)); |
| 227 | |
| 228 | extern value |
| 229 | value_from_longest PARAMS ((struct type *type, LONGEST num)); |
| 230 | |
| 231 | extern value |
| 232 | value_from_double PARAMS ((struct type *type, double num)); |
| 233 | |
| 234 | extern value |
| 235 | value_at PARAMS ((struct type *type, CORE_ADDR addr)); |
| 236 | |
| 237 | extern value |
| 238 | value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr)); |
| 239 | |
| 240 | /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */ |
| 241 | extern value |
| 242 | value_from_register PARAMS ((struct type *type, int regnum, |
| 243 | struct frame_info * frame)); |
| 244 | |
| 245 | extern value |
| 246 | value_of_variable PARAMS ((struct symbol *var)); |
| 247 | |
| 248 | extern value |
| 249 | value_of_register PARAMS ((int regnum)); |
| 250 | |
| 251 | /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */ |
| 252 | extern value |
| 253 | read_var_value PARAMS ((struct symbol *var, struct frame_info *frame)); |
| 254 | |
| 255 | /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */ |
| 256 | extern value |
| 257 | locate_var_value PARAMS ((struct symbol *var, struct frame_info *frame)); |
| 258 | |
| 259 | extern value |
| 260 | allocate_value PARAMS ((struct type *type)); |
| 261 | |
| 262 | extern value |
| 263 | allocate_repeat_value PARAMS ((struct type *type, int count)); |
| 264 | |
| 265 | extern value |
| 266 | value_mark PARAMS ((void)); |
| 267 | |
| 268 | extern void |
| 269 | value_free_to_mark PARAMS ((value mark)); |
| 270 | |
| 271 | extern value |
| 272 | value_string PARAMS ((char *ptr, int len)); |
| 273 | |
| 274 | extern value |
| 275 | value_array PARAMS ((int lowbound, int highbound, value *elemvec)); |
| 276 | |
| 277 | extern value |
| 278 | value_concat PARAMS ((value arg1, value arg2)); |
| 279 | |
| 280 | extern value |
| 281 | value_binop PARAMS ((value arg1, value arg2, enum exp_opcode op)); |
| 282 | |
| 283 | extern value |
| 284 | value_add PARAMS ((value arg1, value arg2)); |
| 285 | |
| 286 | extern value |
| 287 | value_sub PARAMS ((value arg1, value arg2)); |
| 288 | |
| 289 | extern value |
| 290 | value_coerce_array PARAMS ((value arg1)); |
| 291 | |
| 292 | extern value |
| 293 | value_coerce_function PARAMS ((value arg1)); |
| 294 | |
| 295 | extern value |
| 296 | value_ind PARAMS ((value arg1)); |
| 297 | |
| 298 | extern value |
| 299 | value_addr PARAMS ((value arg1)); |
| 300 | |
| 301 | extern value |
| 302 | value_assign PARAMS ((value toval, value fromval)); |
| 303 | |
| 304 | extern value |
| 305 | value_neg PARAMS ((value arg1)); |
| 306 | |
| 307 | extern value |
| 308 | value_complement PARAMS ((value arg1)); |
| 309 | |
| 310 | extern value |
| 311 | value_struct_elt PARAMS ((value *argp, value *args, char *name, |
| 312 | int *static_memfuncp, char *err)); |
| 313 | |
| 314 | extern value |
| 315 | value_struct_elt_for_reference PARAMS ((struct type *domain, |
| 316 | int offset, |
| 317 | struct type *curtype, |
| 318 | char *name, |
| 319 | struct type *intype)); |
| 320 | |
| 321 | extern value |
| 322 | value_field PARAMS ((value arg1, int fieldno)); |
| 323 | |
| 324 | extern value |
| 325 | value_primitive_field PARAMS ((value arg1, int offset, int fieldno, |
| 326 | struct type *arg_type)); |
| 327 | |
| 328 | extern value |
| 329 | value_cast PARAMS ((struct type *type, value arg2)); |
| 330 | |
| 331 | extern value |
| 332 | value_zero PARAMS ((struct type *type, enum lval_type lv)); |
| 333 | |
| 334 | extern value |
| 335 | value_repeat PARAMS ((value arg1, int count)); |
| 336 | |
| 337 | extern value |
| 338 | value_subscript PARAMS ((value array, value idx)); |
| 339 | |
| 340 | extern value |
| 341 | value_from_vtable_info PARAMS ((value arg, struct type *type)); |
| 342 | |
| 343 | extern value |
| 344 | value_being_returned PARAMS ((struct type *valtype, |
| 345 | char retbuf[REGISTER_BYTES], |
| 346 | int struct_return)); |
| 347 | |
| 348 | extern int |
| 349 | using_struct_return PARAMS ((value function, CORE_ADDR funcaddr, |
| 350 | struct type *value_type, int gcc_p)); |
| 351 | |
| 352 | extern void |
| 353 | set_return_value PARAMS ((value val)); |
| 354 | |
| 355 | extern value |
| 356 | evaluate_expression PARAMS ((struct expression *exp)); |
| 357 | |
| 358 | extern value |
| 359 | evaluate_type PARAMS ((struct expression *exp)); |
| 360 | |
| 361 | extern value |
| 362 | parse_and_eval PARAMS ((char *exp)); |
| 363 | |
| 364 | extern value |
| 365 | parse_to_comma_and_eval PARAMS ((char **expp)); |
| 366 | |
| 367 | extern struct type * |
| 368 | parse_and_eval_type PARAMS ((char *p, int length)); |
| 369 | |
| 370 | extern CORE_ADDR |
| 371 | parse_and_eval_address PARAMS ((char *exp)); |
| 372 | |
| 373 | extern CORE_ADDR |
| 374 | parse_and_eval_address_1 PARAMS ((char **expptr)); |
| 375 | |
| 376 | extern value |
| 377 | access_value_history PARAMS ((int num)); |
| 378 | |
| 379 | extern value |
| 380 | value_of_internalvar PARAMS ((struct internalvar *var)); |
| 381 | |
| 382 | extern void |
| 383 | set_internalvar PARAMS ((struct internalvar *var, value val)); |
| 384 | |
| 385 | extern void |
| 386 | set_internalvar_component PARAMS ((struct internalvar *var, int offset, |
| 387 | int bitpos, int bitsize, |
| 388 | value newvalue)); |
| 389 | |
| 390 | extern struct internalvar * |
| 391 | lookup_internalvar PARAMS ((char *name)); |
| 392 | |
| 393 | extern int |
| 394 | value_equal PARAMS ((value arg1, value arg2)); |
| 395 | |
| 396 | extern int |
| 397 | value_less PARAMS ((value arg1, value arg2)); |
| 398 | |
| 399 | extern int |
| 400 | value_logical_not PARAMS ((value arg1)); |
| 401 | |
| 402 | /* C++ */ |
| 403 | |
| 404 | extern value |
| 405 | value_of_this PARAMS ((int complain)); |
| 406 | |
| 407 | extern value |
| 408 | value_x_binop PARAMS ((value arg1, value arg2, enum exp_opcode op, |
| 409 | enum exp_opcode otherop)); |
| 410 | |
| 411 | extern value |
| 412 | value_x_unop PARAMS ((value arg1, enum exp_opcode op)); |
| 413 | |
| 414 | extern value |
| 415 | value_fn_field PARAMS ((value *arg1p, struct fn_field *f, int j, |
| 416 | struct type* type, int offset)); |
| 417 | |
| 418 | extern value |
| 419 | value_virtual_fn_field PARAMS ((value *arg1p, struct fn_field *f, int j, |
| 420 | struct type *type, int offset)); |
| 421 | |
| 422 | extern int |
| 423 | binop_user_defined_p PARAMS ((enum exp_opcode op, value arg1, value arg2)); |
| 424 | |
| 425 | extern int |
| 426 | unop_user_defined_p PARAMS ((enum exp_opcode op, value arg1)); |
| 427 | |
| 428 | extern int |
| 429 | destructor_name_p PARAMS ((const char *name, const struct type *type)); |
| 430 | |
| 431 | #define value_free(val) free ((PTR)val) |
| 432 | |
| 433 | extern void |
| 434 | free_all_values PARAMS ((void)); |
| 435 | |
| 436 | extern void |
| 437 | release_value PARAMS ((value val)); |
| 438 | |
| 439 | extern int |
| 440 | record_latest_value PARAMS ((value val)); |
| 441 | |
| 442 | extern void |
| 443 | registers_changed PARAMS ((void)); |
| 444 | |
| 445 | extern void |
| 446 | read_register_bytes PARAMS ((int regbyte, char *myaddr, int len)); |
| 447 | |
| 448 | extern void |
| 449 | write_register_bytes PARAMS ((int regbyte, char *myaddr, int len)); |
| 450 | |
| 451 | extern void |
| 452 | read_register_gen PARAMS ((int regno, char *myaddr)); |
| 453 | |
| 454 | extern CORE_ADDR |
| 455 | read_register PARAMS ((int regno)); |
| 456 | |
| 457 | extern void |
| 458 | write_register PARAMS ((int regno, int val)); |
| 459 | |
| 460 | extern void |
| 461 | supply_register PARAMS ((int regno, char *val)); |
| 462 | |
| 463 | /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */ |
| 464 | extern void |
| 465 | get_saved_register PARAMS ((char *raw_buffer, int *optimized, |
| 466 | CORE_ADDR *addrp, struct frame_info *frame, |
| 467 | int regnum, enum lval_type *lval)); |
| 468 | |
| 469 | extern void |
| 470 | modify_field PARAMS ((char *addr, int fieldval, int bitpos, int bitsize)); |
| 471 | |
| 472 | extern void |
| 473 | type_print PARAMS ((struct type *type, char *varstring, FILE *stream, |
| 474 | int show)); |
| 475 | |
| 476 | extern char * |
| 477 | baseclass_addr PARAMS ((struct type *type, int index, char *valaddr, |
| 478 | value *valuep, int *errp)); |
| 479 | |
| 480 | extern void |
| 481 | print_longest PARAMS ((FILE *stream, char format, int use_local, |
| 482 | LONGEST value)); |
| 483 | |
| 484 | extern void |
| 485 | print_floating PARAMS ((char *valaddr, struct type *type, FILE *stream)); |
| 486 | |
| 487 | extern int |
| 488 | value_print PARAMS ((value val, FILE *stream, int format, |
| 489 | enum val_prettyprint pretty)); |
| 490 | |
| 491 | extern int |
| 492 | val_print PARAMS ((struct type *type, char *valaddr, CORE_ADDR address, |
| 493 | FILE *stream, int format, int deref_ref, |
| 494 | int recurse, enum val_prettyprint pretty)); |
| 495 | |
| 496 | extern int |
| 497 | val_print_string PARAMS ((CORE_ADDR addr, unsigned int len, FILE *stream)); |
| 498 | |
| 499 | /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */ |
| 500 | extern void |
| 501 | print_variable_value PARAMS ((struct symbol *var, struct frame_info *frame, |
| 502 | FILE *stream)); |
| 503 | |
| 504 | extern value |
| 505 | value_arg_coerce PARAMS ((value)); |
| 506 | |
| 507 | extern int |
| 508 | check_field PARAMS ((value, const char *)); |
| 509 | |
| 510 | extern void |
| 511 | c_typedef_print PARAMS ((struct type *type, struct symbol *new, FILE *stream)); |
| 512 | |
| 513 | extern char * |
| 514 | internalvar_name PARAMS ((struct internalvar *var)); |
| 515 | |
| 516 | extern void |
| 517 | clear_value_history PARAMS ((void)); |
| 518 | |
| 519 | extern void |
| 520 | clear_internalvars PARAMS ((void)); |
| 521 | |
| 522 | /* From values.c */ |
| 523 | |
| 524 | extern value |
| 525 | value_copy PARAMS ((value)); |
| 526 | |
| 527 | extern int |
| 528 | baseclass_offset PARAMS ((struct type *, int, value, int)); |
| 529 | |
| 530 | /* From valops.c */ |
| 531 | |
| 532 | extern value |
| 533 | call_function_by_hand PARAMS ((value, int, value *)); |
| 534 | |
| 535 | #endif /* !defined (VALUE_H) */ |