| 1 | /* Perform arithmetic and other operations on values, for GDB. |
| 2 | Copyright (C) 1986, 1989 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | GDB 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 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GDB 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 GDB; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "param.h" |
| 22 | #include "value.h" |
| 23 | #include "expression.h" |
| 24 | #include "target.h" |
| 25 | #include <string.h> |
| 26 | |
| 27 | \f |
| 28 | value value_x_binop (); |
| 29 | value value_subscripted_rvalue (); |
| 30 | |
| 31 | value |
| 32 | value_add (arg1, arg2) |
| 33 | value arg1, arg2; |
| 34 | { |
| 35 | register value val, valint, valptr; |
| 36 | register int len; |
| 37 | |
| 38 | COERCE_ARRAY (arg1); |
| 39 | COERCE_ARRAY (arg2); |
| 40 | |
| 41 | if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR |
| 42 | || TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR) |
| 43 | && |
| 44 | (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT |
| 45 | || TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT)) |
| 46 | /* Exactly one argument is a pointer, and one is an integer. */ |
| 47 | { |
| 48 | if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) |
| 49 | { |
| 50 | valptr = arg1; |
| 51 | valint = arg2; |
| 52 | } |
| 53 | else |
| 54 | { |
| 55 | valptr = arg2; |
| 56 | valint = arg1; |
| 57 | } |
| 58 | len = TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (valptr))); |
| 59 | if (len == 0) len = 1; /* For (void *) */ |
| 60 | val = value_from_long (builtin_type_long, |
| 61 | value_as_long (valptr) |
| 62 | + (len * value_as_long (valint))); |
| 63 | VALUE_TYPE (val) = VALUE_TYPE (valptr); |
| 64 | return val; |
| 65 | } |
| 66 | |
| 67 | return value_binop (arg1, arg2, BINOP_ADD); |
| 68 | } |
| 69 | |
| 70 | value |
| 71 | value_sub (arg1, arg2) |
| 72 | value arg1, arg2; |
| 73 | { |
| 74 | register value val; |
| 75 | |
| 76 | COERCE_ARRAY (arg1); |
| 77 | COERCE_ARRAY (arg2); |
| 78 | |
| 79 | if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) |
| 80 | { |
| 81 | if (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT) |
| 82 | { |
| 83 | /* pointer - integer. */ |
| 84 | val = value_from_long |
| 85 | (builtin_type_long, |
| 86 | value_as_long (arg1) |
| 87 | - (TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) |
| 88 | * value_as_long (arg2))); |
| 89 | VALUE_TYPE (val) = VALUE_TYPE (arg1); |
| 90 | return val; |
| 91 | } |
| 92 | else if (VALUE_TYPE (arg1) == VALUE_TYPE (arg2)) |
| 93 | { |
| 94 | /* pointer to <type x> - pointer to <type x>. */ |
| 95 | val = value_from_long |
| 96 | (builtin_type_long, |
| 97 | (value_as_long (arg1) - value_as_long (arg2)) |
| 98 | / TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)))); |
| 99 | return val; |
| 100 | } |
| 101 | else |
| 102 | { |
| 103 | error ("\ |
| 104 | First argument of `-' is a pointer and second argument is neither\n\ |
| 105 | an integer nor a pointer of the same type."); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | return value_binop (arg1, arg2, BINOP_SUB); |
| 110 | } |
| 111 | |
| 112 | /* Return the value of ARRAY[IDX]. */ |
| 113 | |
| 114 | value |
| 115 | value_subscript (array, idx) |
| 116 | value array, idx; |
| 117 | { |
| 118 | if (TYPE_CODE (VALUE_TYPE (array)) == TYPE_CODE_ARRAY |
| 119 | && VALUE_LVAL (array) != lval_memory) |
| 120 | return value_subscripted_rvalue (array, idx); |
| 121 | else |
| 122 | return value_ind (value_add (array, idx)); |
| 123 | } |
| 124 | |
| 125 | /* Return the value of EXPR[IDX], expr an aggregate rvalue |
| 126 | (eg, a vector register). This routine used to promote floats |
| 127 | to doubles, but no longer does. */ |
| 128 | |
| 129 | value |
| 130 | value_subscripted_rvalue (array, idx) |
| 131 | value array, idx; |
| 132 | { |
| 133 | struct type *elt_type = TYPE_TARGET_TYPE (VALUE_TYPE (array)); |
| 134 | int elt_size = TYPE_LENGTH (elt_type); |
| 135 | int elt_offs = elt_size * value_as_long (idx); |
| 136 | value v; |
| 137 | |
| 138 | if (elt_offs >= TYPE_LENGTH (VALUE_TYPE (array))) |
| 139 | error ("no such vector element"); |
| 140 | |
| 141 | v = allocate_value (elt_type); |
| 142 | bcopy (VALUE_CONTENTS (array) + elt_offs, VALUE_CONTENTS (v), elt_size); |
| 143 | |
| 144 | if (VALUE_LVAL (array) == lval_internalvar) |
| 145 | VALUE_LVAL (v) = lval_internalvar_component; |
| 146 | else |
| 147 | VALUE_LVAL (v) = not_lval; |
| 148 | VALUE_ADDRESS (v) = VALUE_ADDRESS (array); |
| 149 | VALUE_OFFSET (v) = VALUE_OFFSET (array) + elt_offs; |
| 150 | VALUE_BITSIZE (v) = elt_size * 8; |
| 151 | return v; |
| 152 | } |
| 153 | \f |
| 154 | /* Check to see if either argument is a structure. This is called so |
| 155 | we know whether to go ahead with the normal binop or look for a |
| 156 | user defined function instead. |
| 157 | |
| 158 | For now, we do not overload the `=' operator. */ |
| 159 | |
| 160 | int |
| 161 | binop_user_defined_p (op, arg1, arg2) |
| 162 | enum exp_opcode op; |
| 163 | value arg1, arg2; |
| 164 | { |
| 165 | if (op == BINOP_ASSIGN) |
| 166 | return 0; |
| 167 | return (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRUCT |
| 168 | || TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_STRUCT |
| 169 | || (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_REF |
| 170 | && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_STRUCT) |
| 171 | || (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_REF |
| 172 | && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_STRUCT)); |
| 173 | } |
| 174 | |
| 175 | /* Check to see if argument is a structure. This is called so |
| 176 | we know whether to go ahead with the normal unop or look for a |
| 177 | user defined function instead. |
| 178 | |
| 179 | For now, we do not overload the `&' operator. */ |
| 180 | |
| 181 | int unop_user_defined_p (op, arg1) |
| 182 | enum exp_opcode op; |
| 183 | value arg1; |
| 184 | { |
| 185 | if (op == UNOP_ADDR) |
| 186 | return 0; |
| 187 | return (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRUCT |
| 188 | || (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_REF |
| 189 | && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_STRUCT)); |
| 190 | } |
| 191 | |
| 192 | /* We know either arg1 or arg2 is a structure, so try to find the right |
| 193 | user defined function. Create an argument vector that calls |
| 194 | arg1.operator @ (arg1,arg2) and return that value (where '@' is any |
| 195 | binary operator which is legal for GNU C++). */ |
| 196 | |
| 197 | value |
| 198 | value_x_binop (arg1, arg2, op, otherop) |
| 199 | value arg1, arg2; |
| 200 | enum exp_opcode op, otherop; |
| 201 | { |
| 202 | value * argvec; |
| 203 | char *ptr; |
| 204 | char tstr[13]; |
| 205 | int static_memfuncp; |
| 206 | |
| 207 | COERCE_ENUM (arg1); |
| 208 | COERCE_ENUM (arg2); |
| 209 | |
| 210 | /* now we know that what we have to do is construct our |
| 211 | arg vector and find the right function to call it with. */ |
| 212 | |
| 213 | if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_STRUCT) |
| 214 | error ("Can't do that binary op on that type"); /* FIXME be explicit */ |
| 215 | |
| 216 | argvec = (value *) alloca (sizeof (value) * 4); |
| 217 | argvec[1] = value_addr (arg1); |
| 218 | argvec[2] = arg2; |
| 219 | argvec[3] = 0; |
| 220 | |
| 221 | /* make the right function name up */ |
| 222 | strcpy(tstr, "operator__"); |
| 223 | ptr = tstr+8; |
| 224 | switch (op) |
| 225 | { |
| 226 | case BINOP_ADD: strcpy(ptr,"+"); break; |
| 227 | case BINOP_SUB: strcpy(ptr,"-"); break; |
| 228 | case BINOP_MUL: strcpy(ptr,"*"); break; |
| 229 | case BINOP_DIV: strcpy(ptr,"/"); break; |
| 230 | case BINOP_REM: strcpy(ptr,"%"); break; |
| 231 | case BINOP_LSH: strcpy(ptr,"<<"); break; |
| 232 | case BINOP_RSH: strcpy(ptr,">>"); break; |
| 233 | case BINOP_LOGAND: strcpy(ptr,"&"); break; |
| 234 | case BINOP_LOGIOR: strcpy(ptr,"|"); break; |
| 235 | case BINOP_LOGXOR: strcpy(ptr,"^"); break; |
| 236 | case BINOP_AND: strcpy(ptr,"&&"); break; |
| 237 | case BINOP_OR: strcpy(ptr,"||"); break; |
| 238 | case BINOP_MIN: strcpy(ptr,"<?"); break; |
| 239 | case BINOP_MAX: strcpy(ptr,">?"); break; |
| 240 | case BINOP_ASSIGN: strcpy(ptr,"="); break; |
| 241 | case BINOP_ASSIGN_MODIFY: |
| 242 | switch (otherop) |
| 243 | { |
| 244 | case BINOP_ADD: strcpy(ptr,"+="); break; |
| 245 | case BINOP_SUB: strcpy(ptr,"-="); break; |
| 246 | case BINOP_MUL: strcpy(ptr,"*="); break; |
| 247 | case BINOP_DIV: strcpy(ptr,"/="); break; |
| 248 | case BINOP_REM: strcpy(ptr,"%="); break; |
| 249 | case BINOP_LOGAND: strcpy(ptr,"&="); break; |
| 250 | case BINOP_LOGIOR: strcpy(ptr,"|="); break; |
| 251 | case BINOP_LOGXOR: strcpy(ptr,"^="); break; |
| 252 | default: |
| 253 | error ("Invalid binary operation specified."); |
| 254 | } |
| 255 | break; |
| 256 | case BINOP_SUBSCRIPT: strcpy(ptr,"[]"); break; |
| 257 | case BINOP_EQUAL: strcpy(ptr,"=="); break; |
| 258 | case BINOP_NOTEQUAL: strcpy(ptr,"!="); break; |
| 259 | case BINOP_LESS: strcpy(ptr,"<"); break; |
| 260 | case BINOP_GTR: strcpy(ptr,">"); break; |
| 261 | case BINOP_GEQ: strcpy(ptr,">="); break; |
| 262 | case BINOP_LEQ: strcpy(ptr,"<="); break; |
| 263 | default: |
| 264 | error ("Invalid binary operation specified."); |
| 265 | } |
| 266 | argvec[0] = value_struct_elt (&arg1, argvec+1, tstr, &static_memfuncp, "structure"); |
| 267 | if (argvec[0]) |
| 268 | { |
| 269 | if (static_memfuncp) |
| 270 | { |
| 271 | argvec[1] = argvec[0]; |
| 272 | argvec++; |
| 273 | } |
| 274 | return target_call_function (argvec[0], 2 - static_memfuncp, argvec + 1); |
| 275 | } |
| 276 | error ("member function %s not found", tstr); |
| 277 | #ifdef lint |
| 278 | return target_call_function (argvec[0], 2 - static_memfuncp, argvec + 1); |
| 279 | #endif |
| 280 | } |
| 281 | |
| 282 | /* We know that arg1 is a structure, so try to find a unary user |
| 283 | defined operator that matches the operator in question. |
| 284 | Create an argument vector that calls arg1.operator @ (arg1) |
| 285 | and return that value (where '@' is (almost) any unary operator which |
| 286 | is legal for GNU C++). */ |
| 287 | |
| 288 | value |
| 289 | value_x_unop (arg1, op) |
| 290 | value arg1; |
| 291 | enum exp_opcode op; |
| 292 | { |
| 293 | value * argvec; |
| 294 | char *ptr; |
| 295 | char tstr[13]; |
| 296 | int static_memfuncp; |
| 297 | |
| 298 | COERCE_ENUM (arg1); |
| 299 | |
| 300 | /* now we know that what we have to do is construct our |
| 301 | arg vector and find the right function to call it with. */ |
| 302 | |
| 303 | if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_STRUCT) |
| 304 | error ("Can't do that unary op on that type"); /* FIXME be explicit */ |
| 305 | |
| 306 | argvec = (value *) alloca (sizeof (value) * 3); |
| 307 | argvec[1] = value_addr (arg1); |
| 308 | argvec[2] = 0; |
| 309 | |
| 310 | /* make the right function name up */ |
| 311 | strcpy(tstr,"operator__"); |
| 312 | ptr = tstr+8; |
| 313 | switch (op) |
| 314 | { |
| 315 | case UNOP_PREINCREMENT: strcpy(ptr,"++"); break; |
| 316 | case UNOP_PREDECREMENT: strcpy(ptr,"++"); break; |
| 317 | case UNOP_POSTINCREMENT: strcpy(ptr,"++"); break; |
| 318 | case UNOP_POSTDECREMENT: strcpy(ptr,"++"); break; |
| 319 | case UNOP_ZEROP: strcpy(ptr,"!"); break; |
| 320 | case UNOP_LOGNOT: strcpy(ptr,"~"); break; |
| 321 | case UNOP_NEG: strcpy(ptr,"-"); break; |
| 322 | default: |
| 323 | error ("Invalid binary operation specified."); |
| 324 | } |
| 325 | argvec[0] = value_struct_elt (&arg1, argvec+1, tstr, &static_memfuncp, "structure"); |
| 326 | if (argvec[0]) |
| 327 | { |
| 328 | if (static_memfuncp) |
| 329 | { |
| 330 | argvec[1] = argvec[0]; |
| 331 | argvec++; |
| 332 | } |
| 333 | return target_call_function (argvec[0], 1 - static_memfuncp, argvec + 1); |
| 334 | } |
| 335 | error ("member function %s not found", tstr); |
| 336 | return 0; /* For lint -- never reached */ |
| 337 | } |
| 338 | \f |
| 339 | /* Perform a binary operation on two integers or two floats. |
| 340 | Does not support addition and subtraction on pointers; |
| 341 | use value_add or value_sub if you want to handle those possibilities. */ |
| 342 | |
| 343 | value |
| 344 | value_binop (arg1, arg2, op) |
| 345 | value arg1, arg2; |
| 346 | int op; |
| 347 | { |
| 348 | register value val; |
| 349 | |
| 350 | COERCE_ENUM (arg1); |
| 351 | COERCE_ENUM (arg2); |
| 352 | |
| 353 | if ((TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_FLT |
| 354 | && |
| 355 | TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT) |
| 356 | || |
| 357 | (TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_FLT |
| 358 | && |
| 359 | TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_INT)) |
| 360 | error ("Argument to arithmetic operation not a number."); |
| 361 | |
| 362 | if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_FLT |
| 363 | || |
| 364 | TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_FLT) |
| 365 | { |
| 366 | double v1, v2, v; |
| 367 | v1 = value_as_double (arg1); |
| 368 | v2 = value_as_double (arg2); |
| 369 | switch (op) |
| 370 | { |
| 371 | case BINOP_ADD: |
| 372 | v = v1 + v2; |
| 373 | break; |
| 374 | |
| 375 | case BINOP_SUB: |
| 376 | v = v1 - v2; |
| 377 | break; |
| 378 | |
| 379 | case BINOP_MUL: |
| 380 | v = v1 * v2; |
| 381 | break; |
| 382 | |
| 383 | case BINOP_DIV: |
| 384 | v = v1 / v2; |
| 385 | break; |
| 386 | |
| 387 | default: |
| 388 | error ("Integer-only operation on floating point number."); |
| 389 | } |
| 390 | |
| 391 | val = allocate_value (builtin_type_double); |
| 392 | SWAP_TARGET_AND_HOST (&v, sizeof (v)); |
| 393 | *(double *) VALUE_CONTENTS_RAW (val) = v; |
| 394 | } |
| 395 | else |
| 396 | /* Integral operations here. */ |
| 397 | { |
| 398 | /* Should we promote to unsigned longest? */ |
| 399 | if ((TYPE_UNSIGNED (VALUE_TYPE (arg1)) |
| 400 | || TYPE_UNSIGNED (VALUE_TYPE (arg2))) |
| 401 | && (TYPE_LENGTH (VALUE_TYPE (arg1)) >= sizeof (unsigned LONGEST) |
| 402 | || TYPE_LENGTH (VALUE_TYPE (arg1)) >= sizeof (unsigned LONGEST))) |
| 403 | { |
| 404 | unsigned LONGEST v1, v2, v; |
| 405 | v1 = (unsigned LONGEST) value_as_long (arg1); |
| 406 | v2 = (unsigned LONGEST) value_as_long (arg2); |
| 407 | |
| 408 | switch (op) |
| 409 | { |
| 410 | case BINOP_ADD: |
| 411 | v = v1 + v2; |
| 412 | break; |
| 413 | |
| 414 | case BINOP_SUB: |
| 415 | v = v1 - v2; |
| 416 | break; |
| 417 | |
| 418 | case BINOP_MUL: |
| 419 | v = v1 * v2; |
| 420 | break; |
| 421 | |
| 422 | case BINOP_DIV: |
| 423 | v = v1 / v2; |
| 424 | break; |
| 425 | |
| 426 | case BINOP_REM: |
| 427 | v = v1 % v2; |
| 428 | break; |
| 429 | |
| 430 | case BINOP_LSH: |
| 431 | v = v1 << v2; |
| 432 | break; |
| 433 | |
| 434 | case BINOP_RSH: |
| 435 | v = v1 >> v2; |
| 436 | break; |
| 437 | |
| 438 | case BINOP_LOGAND: |
| 439 | v = v1 & v2; |
| 440 | break; |
| 441 | |
| 442 | case BINOP_LOGIOR: |
| 443 | v = v1 | v2; |
| 444 | break; |
| 445 | |
| 446 | case BINOP_LOGXOR: |
| 447 | v = v1 ^ v2; |
| 448 | break; |
| 449 | |
| 450 | case BINOP_AND: |
| 451 | v = v1 && v2; |
| 452 | break; |
| 453 | |
| 454 | case BINOP_OR: |
| 455 | v = v1 || v2; |
| 456 | break; |
| 457 | |
| 458 | case BINOP_MIN: |
| 459 | v = v1 < v2 ? v1 : v2; |
| 460 | break; |
| 461 | |
| 462 | case BINOP_MAX: |
| 463 | v = v1 > v2 ? v1 : v2; |
| 464 | break; |
| 465 | |
| 466 | default: |
| 467 | error ("Invalid binary operation on numbers."); |
| 468 | } |
| 469 | |
| 470 | val = allocate_value (BUILTIN_TYPE_UNSIGNED_LONGEST); |
| 471 | SWAP_TARGET_AND_HOST (&v, sizeof (v)); |
| 472 | *(unsigned LONGEST *) VALUE_CONTENTS_RAW (val) = v; |
| 473 | } |
| 474 | else |
| 475 | { |
| 476 | LONGEST v1, v2, v; |
| 477 | v1 = value_as_long (arg1); |
| 478 | v2 = value_as_long (arg2); |
| 479 | |
| 480 | switch (op) |
| 481 | { |
| 482 | case BINOP_ADD: |
| 483 | v = v1 + v2; |
| 484 | break; |
| 485 | |
| 486 | case BINOP_SUB: |
| 487 | v = v1 - v2; |
| 488 | break; |
| 489 | |
| 490 | case BINOP_MUL: |
| 491 | v = v1 * v2; |
| 492 | break; |
| 493 | |
| 494 | case BINOP_DIV: |
| 495 | v = v1 / v2; |
| 496 | break; |
| 497 | |
| 498 | case BINOP_REM: |
| 499 | v = v1 % v2; |
| 500 | break; |
| 501 | |
| 502 | case BINOP_LSH: |
| 503 | v = v1 << v2; |
| 504 | break; |
| 505 | |
| 506 | case BINOP_RSH: |
| 507 | v = v1 >> v2; |
| 508 | break; |
| 509 | |
| 510 | case BINOP_LOGAND: |
| 511 | v = v1 & v2; |
| 512 | break; |
| 513 | |
| 514 | case BINOP_LOGIOR: |
| 515 | v = v1 | v2; |
| 516 | break; |
| 517 | |
| 518 | case BINOP_LOGXOR: |
| 519 | v = v1 ^ v2; |
| 520 | break; |
| 521 | |
| 522 | case BINOP_AND: |
| 523 | v = v1 && v2; |
| 524 | break; |
| 525 | |
| 526 | case BINOP_OR: |
| 527 | v = v1 || v2; |
| 528 | break; |
| 529 | |
| 530 | case BINOP_MIN: |
| 531 | v = v1 < v2 ? v1 : v2; |
| 532 | break; |
| 533 | |
| 534 | case BINOP_MAX: |
| 535 | v = v1 > v2 ? v1 : v2; |
| 536 | break; |
| 537 | |
| 538 | default: |
| 539 | error ("Invalid binary operation on numbers."); |
| 540 | } |
| 541 | |
| 542 | val = allocate_value (BUILTIN_TYPE_LONGEST); |
| 543 | SWAP_TARGET_AND_HOST (&v, sizeof (v)); |
| 544 | *(LONGEST *) VALUE_CONTENTS_RAW (val) = v; |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | return val; |
| 549 | } |
| 550 | \f |
| 551 | /* Simulate the C operator ! -- return 1 if ARG1 contains zeros. */ |
| 552 | |
| 553 | int |
| 554 | value_zerop (arg1) |
| 555 | value arg1; |
| 556 | { |
| 557 | register int len; |
| 558 | register char *p; |
| 559 | |
| 560 | COERCE_ARRAY (arg1); |
| 561 | |
| 562 | len = TYPE_LENGTH (VALUE_TYPE (arg1)); |
| 563 | p = VALUE_CONTENTS (arg1); |
| 564 | |
| 565 | while (--len >= 0) |
| 566 | { |
| 567 | if (*p++) |
| 568 | break; |
| 569 | } |
| 570 | |
| 571 | return len < 0; |
| 572 | } |
| 573 | |
| 574 | /* Simulate the C operator == by returning a 1 |
| 575 | iff ARG1 and ARG2 have equal contents. */ |
| 576 | |
| 577 | int |
| 578 | value_equal (arg1, arg2) |
| 579 | register value arg1, arg2; |
| 580 | |
| 581 | { |
| 582 | register int len; |
| 583 | register char *p1, *p2; |
| 584 | enum type_code code1; |
| 585 | enum type_code code2; |
| 586 | |
| 587 | COERCE_ARRAY (arg1); |
| 588 | COERCE_ARRAY (arg2); |
| 589 | |
| 590 | code1 = TYPE_CODE (VALUE_TYPE (arg1)); |
| 591 | code2 = TYPE_CODE (VALUE_TYPE (arg2)); |
| 592 | |
| 593 | if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT) |
| 594 | return value_as_long (arg1) == value_as_long (arg2); |
| 595 | else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT) |
| 596 | && (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT)) |
| 597 | return value_as_double (arg1) == value_as_double (arg2); |
| 598 | else if ((code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_INT) |
| 599 | || (code2 == TYPE_CODE_PTR && code1 == TYPE_CODE_INT)) |
| 600 | return (char *) value_as_long (arg1) == (char *) value_as_long (arg2); |
| 601 | else if (code1 == code2 |
| 602 | && ((len = TYPE_LENGTH (VALUE_TYPE (arg1))) |
| 603 | == TYPE_LENGTH (VALUE_TYPE (arg2)))) |
| 604 | { |
| 605 | p1 = VALUE_CONTENTS (arg1); |
| 606 | p2 = VALUE_CONTENTS (arg2); |
| 607 | while (--len >= 0) |
| 608 | { |
| 609 | if (*p1++ != *p2++) |
| 610 | break; |
| 611 | } |
| 612 | return len < 0; |
| 613 | } |
| 614 | else |
| 615 | { |
| 616 | error ("Invalid type combination in equality test."); |
| 617 | return 0; /* For lint -- never reached */ |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | /* Simulate the C operator < by returning 1 |
| 622 | iff ARG1's contents are less than ARG2's. */ |
| 623 | |
| 624 | int |
| 625 | value_less (arg1, arg2) |
| 626 | register value arg1, arg2; |
| 627 | { |
| 628 | register enum type_code code1; |
| 629 | register enum type_code code2; |
| 630 | |
| 631 | COERCE_ARRAY (arg1); |
| 632 | COERCE_ARRAY (arg2); |
| 633 | |
| 634 | code1 = TYPE_CODE (VALUE_TYPE (arg1)); |
| 635 | code2 = TYPE_CODE (VALUE_TYPE (arg2)); |
| 636 | |
| 637 | if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT) |
| 638 | { |
| 639 | if (TYPE_UNSIGNED (VALUE_TYPE (arg1)) |
| 640 | || TYPE_UNSIGNED (VALUE_TYPE (arg2))) |
| 641 | return (unsigned)value_as_long (arg1) < (unsigned)value_as_long (arg2); |
| 642 | else |
| 643 | return value_as_long (arg1) < value_as_long (arg2); |
| 644 | } |
| 645 | else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT) |
| 646 | && (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT)) |
| 647 | return value_as_double (arg1) < value_as_double (arg2); |
| 648 | else if ((code1 == TYPE_CODE_PTR || code1 == TYPE_CODE_INT) |
| 649 | && (code2 == TYPE_CODE_PTR || code2 == TYPE_CODE_INT)) |
| 650 | { |
| 651 | /* FIXME, this assumes that host and target char *'s are the same! */ |
| 652 | return (char *) value_as_long (arg1) < (char *) value_as_long (arg2); |
| 653 | } |
| 654 | else |
| 655 | { |
| 656 | error ("Invalid type combination in ordering comparison."); |
| 657 | return 0; |
| 658 | } |
| 659 | } |
| 660 | \f |
| 661 | /* The unary operators - and ~. Both free the argument ARG1. */ |
| 662 | |
| 663 | value |
| 664 | value_neg (arg1) |
| 665 | register value arg1; |
| 666 | { |
| 667 | register struct type *type; |
| 668 | |
| 669 | COERCE_ENUM (arg1); |
| 670 | |
| 671 | type = VALUE_TYPE (arg1); |
| 672 | |
| 673 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| 674 | return value_from_double (type, - value_as_double (arg1)); |
| 675 | else if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 676 | return value_from_long (type, - value_as_long (arg1)); |
| 677 | else { |
| 678 | error ("Argument to negate operation not a number."); |
| 679 | return 0; /* For lint -- never reached */ |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | value |
| 684 | value_lognot (arg1) |
| 685 | register value arg1; |
| 686 | { |
| 687 | COERCE_ENUM (arg1); |
| 688 | |
| 689 | if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT) |
| 690 | error ("Argument to complement operation not an integer."); |
| 691 | |
| 692 | return value_from_long (VALUE_TYPE (arg1), ~ value_as_long (arg1)); |
| 693 | } |
| 694 | \f |