| 1 | /* expr.c -operands, expressions- |
| 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 21 | 02110-1301, USA. */ |
| 22 | |
| 23 | /* This is really a branch office of as-read.c. I split it out to clearly |
| 24 | distinguish the world of expressions from the world of statements. |
| 25 | (It also gives smaller files to re-compile.) |
| 26 | Here, "operand"s are of expressions, not instructions. */ |
| 27 | |
| 28 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
| 29 | |
| 30 | #include "as.h" |
| 31 | #include "safe-ctype.h" |
| 32 | #include "obstack.h" |
| 33 | |
| 34 | static void floating_constant (expressionS * expressionP); |
| 35 | static valueT generic_bignum_to_int32 (void); |
| 36 | #ifdef BFD64 |
| 37 | static valueT generic_bignum_to_int64 (void); |
| 38 | #endif |
| 39 | static void integer_constant (int radix, expressionS * expressionP); |
| 40 | static void mri_char_constant (expressionS *); |
| 41 | static void current_location (expressionS *); |
| 42 | static void clean_up_expression (expressionS * expressionP); |
| 43 | static segT operand (expressionS *, enum expr_mode); |
| 44 | static operatorT operator (int *); |
| 45 | |
| 46 | extern const char EXP_CHARS[], FLT_CHARS[]; |
| 47 | |
| 48 | /* We keep a mapping of expression symbols to file positions, so that |
| 49 | we can provide better error messages. */ |
| 50 | |
| 51 | struct expr_symbol_line { |
| 52 | struct expr_symbol_line *next; |
| 53 | symbolS *sym; |
| 54 | char *file; |
| 55 | unsigned int line; |
| 56 | }; |
| 57 | |
| 58 | static struct expr_symbol_line *expr_symbol_lines; |
| 59 | \f |
| 60 | /* Build a dummy symbol to hold a complex expression. This is how we |
| 61 | build expressions up out of other expressions. The symbol is put |
| 62 | into the fake section expr_section. */ |
| 63 | |
| 64 | symbolS * |
| 65 | make_expr_symbol (expressionS *expressionP) |
| 66 | { |
| 67 | expressionS zero; |
| 68 | symbolS *symbolP; |
| 69 | struct expr_symbol_line *n; |
| 70 | |
| 71 | if (expressionP->X_op == O_symbol |
| 72 | && expressionP->X_add_number == 0) |
| 73 | return expressionP->X_add_symbol; |
| 74 | |
| 75 | if (expressionP->X_op == O_big) |
| 76 | { |
| 77 | /* This won't work, because the actual value is stored in |
| 78 | generic_floating_point_number or generic_bignum, and we are |
| 79 | going to lose it if we haven't already. */ |
| 80 | if (expressionP->X_add_number > 0) |
| 81 | as_bad (_("bignum invalid")); |
| 82 | else |
| 83 | as_bad (_("floating point number invalid")); |
| 84 | zero.X_op = O_constant; |
| 85 | zero.X_add_number = 0; |
| 86 | zero.X_unsigned = 0; |
| 87 | clean_up_expression (&zero); |
| 88 | expressionP = &zero; |
| 89 | } |
| 90 | |
| 91 | /* Putting constant symbols in absolute_section rather than |
| 92 | expr_section is convenient for the old a.out code, for which |
| 93 | S_GET_SEGMENT does not always retrieve the value put in by |
| 94 | S_SET_SEGMENT. */ |
| 95 | symbolP = symbol_create (FAKE_LABEL_NAME, |
| 96 | (expressionP->X_op == O_constant |
| 97 | ? absolute_section |
| 98 | : expr_section), |
| 99 | 0, &zero_address_frag); |
| 100 | symbol_set_value_expression (symbolP, expressionP); |
| 101 | |
| 102 | if (expressionP->X_op == O_constant) |
| 103 | resolve_symbol_value (symbolP); |
| 104 | |
| 105 | n = (struct expr_symbol_line *) xmalloc (sizeof *n); |
| 106 | n->sym = symbolP; |
| 107 | as_where (&n->file, &n->line); |
| 108 | n->next = expr_symbol_lines; |
| 109 | expr_symbol_lines = n; |
| 110 | |
| 111 | return symbolP; |
| 112 | } |
| 113 | |
| 114 | /* Return the file and line number for an expr symbol. Return |
| 115 | non-zero if something was found, 0 if no information is known for |
| 116 | the symbol. */ |
| 117 | |
| 118 | int |
| 119 | expr_symbol_where (symbolS *sym, char **pfile, unsigned int *pline) |
| 120 | { |
| 121 | register struct expr_symbol_line *l; |
| 122 | |
| 123 | for (l = expr_symbol_lines; l != NULL; l = l->next) |
| 124 | { |
| 125 | if (l->sym == sym) |
| 126 | { |
| 127 | *pfile = l->file; |
| 128 | *pline = l->line; |
| 129 | return 1; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | \f |
| 136 | /* Utilities for building expressions. |
| 137 | Since complex expressions are recorded as symbols for use in other |
| 138 | expressions these return a symbolS * and not an expressionS *. |
| 139 | These explicitly do not take an "add_number" argument. */ |
| 140 | /* ??? For completeness' sake one might want expr_build_symbol. |
| 141 | It would just return its argument. */ |
| 142 | |
| 143 | /* Build an expression for an unsigned constant. |
| 144 | The corresponding one for signed constants is missing because |
| 145 | there's currently no need for it. One could add an unsigned_p flag |
| 146 | but that seems more clumsy. */ |
| 147 | |
| 148 | symbolS * |
| 149 | expr_build_uconstant (offsetT value) |
| 150 | { |
| 151 | expressionS e; |
| 152 | |
| 153 | e.X_op = O_constant; |
| 154 | e.X_add_number = value; |
| 155 | e.X_unsigned = 1; |
| 156 | return make_expr_symbol (&e); |
| 157 | } |
| 158 | |
| 159 | /* Build an expression for the current location ('.'). */ |
| 160 | |
| 161 | symbolS * |
| 162 | expr_build_dot (void) |
| 163 | { |
| 164 | expressionS e; |
| 165 | |
| 166 | current_location (&e); |
| 167 | return make_expr_symbol (&e); |
| 168 | } |
| 169 | \f |
| 170 | /* Build any floating-point literal here. |
| 171 | Also build any bignum literal here. */ |
| 172 | |
| 173 | /* Seems atof_machine can backscan through generic_bignum and hit whatever |
| 174 | happens to be loaded before it in memory. And its way too complicated |
| 175 | for me to fix right. Thus a hack. JF: Just make generic_bignum bigger, |
| 176 | and never write into the early words, thus they'll always be zero. |
| 177 | I hate Dean's floating-point code. Bleh. */ |
| 178 | LITTLENUM_TYPE generic_bignum[SIZE_OF_LARGE_NUMBER + 6]; |
| 179 | |
| 180 | FLONUM_TYPE generic_floating_point_number = { |
| 181 | &generic_bignum[6], /* low. (JF: Was 0) */ |
| 182 | &generic_bignum[SIZE_OF_LARGE_NUMBER + 6 - 1], /* high. JF: (added +6) */ |
| 183 | 0, /* leader. */ |
| 184 | 0, /* exponent. */ |
| 185 | 0 /* sign. */ |
| 186 | }; |
| 187 | |
| 188 | \f |
| 189 | static void |
| 190 | floating_constant (expressionS *expressionP) |
| 191 | { |
| 192 | /* input_line_pointer -> floating-point constant. */ |
| 193 | int error_code; |
| 194 | |
| 195 | error_code = atof_generic (&input_line_pointer, ".", EXP_CHARS, |
| 196 | &generic_floating_point_number); |
| 197 | |
| 198 | if (error_code) |
| 199 | { |
| 200 | if (error_code == ERROR_EXPONENT_OVERFLOW) |
| 201 | { |
| 202 | as_bad (_("bad floating-point constant: exponent overflow")); |
| 203 | } |
| 204 | else |
| 205 | { |
| 206 | as_bad (_("bad floating-point constant: unknown error code=%d"), |
| 207 | error_code); |
| 208 | } |
| 209 | } |
| 210 | expressionP->X_op = O_big; |
| 211 | /* input_line_pointer -> just after constant, which may point to |
| 212 | whitespace. */ |
| 213 | expressionP->X_add_number = -1; |
| 214 | } |
| 215 | |
| 216 | static valueT |
| 217 | generic_bignum_to_int32 (void) |
| 218 | { |
| 219 | valueT number = |
| 220 | ((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS) |
| 221 | | (generic_bignum[0] & LITTLENUM_MASK); |
| 222 | number &= 0xffffffff; |
| 223 | return number; |
| 224 | } |
| 225 | |
| 226 | #ifdef BFD64 |
| 227 | static valueT |
| 228 | generic_bignum_to_int64 (void) |
| 229 | { |
| 230 | valueT number = |
| 231 | ((((((((valueT) generic_bignum[3] & LITTLENUM_MASK) |
| 232 | << LITTLENUM_NUMBER_OF_BITS) |
| 233 | | ((valueT) generic_bignum[2] & LITTLENUM_MASK)) |
| 234 | << LITTLENUM_NUMBER_OF_BITS) |
| 235 | | ((valueT) generic_bignum[1] & LITTLENUM_MASK)) |
| 236 | << LITTLENUM_NUMBER_OF_BITS) |
| 237 | | ((valueT) generic_bignum[0] & LITTLENUM_MASK)); |
| 238 | return number; |
| 239 | } |
| 240 | #endif |
| 241 | |
| 242 | static void |
| 243 | integer_constant (int radix, expressionS *expressionP) |
| 244 | { |
| 245 | char *start; /* Start of number. */ |
| 246 | char *suffix = NULL; |
| 247 | char c; |
| 248 | valueT number; /* Offset or (absolute) value. */ |
| 249 | short int digit; /* Value of next digit in current radix. */ |
| 250 | short int maxdig = 0; /* Highest permitted digit value. */ |
| 251 | int too_many_digits = 0; /* If we see >= this number of. */ |
| 252 | char *name; /* Points to name of symbol. */ |
| 253 | symbolS *symbolP; /* Points to symbol. */ |
| 254 | |
| 255 | int small; /* True if fits in 32 bits. */ |
| 256 | |
| 257 | /* May be bignum, or may fit in 32 bits. */ |
| 258 | /* Most numbers fit into 32 bits, and we want this case to be fast. |
| 259 | so we pretend it will fit into 32 bits. If, after making up a 32 |
| 260 | bit number, we realise that we have scanned more digits than |
| 261 | comfortably fit into 32 bits, we re-scan the digits coding them |
| 262 | into a bignum. For decimal and octal numbers we are |
| 263 | conservative: Some numbers may be assumed bignums when in fact |
| 264 | they do fit into 32 bits. Numbers of any radix can have excess |
| 265 | leading zeros: We strive to recognise this and cast them back |
| 266 | into 32 bits. We must check that the bignum really is more than |
| 267 | 32 bits, and change it back to a 32-bit number if it fits. The |
| 268 | number we are looking for is expected to be positive, but if it |
| 269 | fits into 32 bits as an unsigned number, we let it be a 32-bit |
| 270 | number. The cavalier approach is for speed in ordinary cases. */ |
| 271 | /* This has been extended for 64 bits. We blindly assume that if |
| 272 | you're compiling in 64-bit mode, the target is a 64-bit machine. |
| 273 | This should be cleaned up. */ |
| 274 | |
| 275 | #ifdef BFD64 |
| 276 | #define valuesize 64 |
| 277 | #else /* includes non-bfd case, mostly */ |
| 278 | #define valuesize 32 |
| 279 | #endif |
| 280 | |
| 281 | if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) && radix == 0) |
| 282 | { |
| 283 | int flt = 0; |
| 284 | |
| 285 | /* In MRI mode, the number may have a suffix indicating the |
| 286 | radix. For that matter, it might actually be a floating |
| 287 | point constant. */ |
| 288 | for (suffix = input_line_pointer; ISALNUM (*suffix); suffix++) |
| 289 | { |
| 290 | if (*suffix == 'e' || *suffix == 'E') |
| 291 | flt = 1; |
| 292 | } |
| 293 | |
| 294 | if (suffix == input_line_pointer) |
| 295 | { |
| 296 | radix = 10; |
| 297 | suffix = NULL; |
| 298 | } |
| 299 | else |
| 300 | { |
| 301 | c = *--suffix; |
| 302 | c = TOUPPER (c); |
| 303 | /* If we have both NUMBERS_WITH_SUFFIX and LOCAL_LABELS_FB, |
| 304 | we distinguish between 'B' and 'b'. This is the case for |
| 305 | Z80. */ |
| 306 | if ((NUMBERS_WITH_SUFFIX && LOCAL_LABELS_FB ? *suffix : c) == 'B') |
| 307 | radix = 2; |
| 308 | else if (c == 'D') |
| 309 | radix = 10; |
| 310 | else if (c == 'O' || c == 'Q') |
| 311 | radix = 8; |
| 312 | else if (c == 'H') |
| 313 | radix = 16; |
| 314 | else if (suffix[1] == '.' || c == 'E' || flt) |
| 315 | { |
| 316 | floating_constant (expressionP); |
| 317 | return; |
| 318 | } |
| 319 | else |
| 320 | { |
| 321 | radix = 10; |
| 322 | suffix = NULL; |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | switch (radix) |
| 328 | { |
| 329 | case 2: |
| 330 | maxdig = 2; |
| 331 | too_many_digits = valuesize + 1; |
| 332 | break; |
| 333 | case 8: |
| 334 | maxdig = radix = 8; |
| 335 | too_many_digits = (valuesize + 2) / 3 + 1; |
| 336 | break; |
| 337 | case 16: |
| 338 | maxdig = radix = 16; |
| 339 | too_many_digits = (valuesize + 3) / 4 + 1; |
| 340 | break; |
| 341 | case 10: |
| 342 | maxdig = radix = 10; |
| 343 | too_many_digits = (valuesize + 11) / 4; /* Very rough. */ |
| 344 | } |
| 345 | #undef valuesize |
| 346 | start = input_line_pointer; |
| 347 | c = *input_line_pointer++; |
| 348 | for (number = 0; |
| 349 | (digit = hex_value (c)) < maxdig; |
| 350 | c = *input_line_pointer++) |
| 351 | { |
| 352 | number = number * radix + digit; |
| 353 | } |
| 354 | /* c contains character after number. */ |
| 355 | /* input_line_pointer->char after c. */ |
| 356 | small = (input_line_pointer - start - 1) < too_many_digits; |
| 357 | |
| 358 | if (radix == 16 && c == '_') |
| 359 | { |
| 360 | /* This is literal of the form 0x333_0_12345678_1. |
| 361 | This example is equivalent to 0x00000333000000001234567800000001. */ |
| 362 | |
| 363 | int num_little_digits = 0; |
| 364 | int i; |
| 365 | input_line_pointer = start; /* -> 1st digit. */ |
| 366 | |
| 367 | know (LITTLENUM_NUMBER_OF_BITS == 16); |
| 368 | |
| 369 | for (c = '_'; c == '_'; num_little_digits += 2) |
| 370 | { |
| 371 | |
| 372 | /* Convert one 64-bit word. */ |
| 373 | int ndigit = 0; |
| 374 | number = 0; |
| 375 | for (c = *input_line_pointer++; |
| 376 | (digit = hex_value (c)) < maxdig; |
| 377 | c = *(input_line_pointer++)) |
| 378 | { |
| 379 | number = number * radix + digit; |
| 380 | ndigit++; |
| 381 | } |
| 382 | |
| 383 | /* Check for 8 digit per word max. */ |
| 384 | if (ndigit > 8) |
| 385 | as_bad (_("a bignum with underscores may not have more than 8 hex digits in any word")); |
| 386 | |
| 387 | /* Add this chunk to the bignum. |
| 388 | Shift things down 2 little digits. */ |
| 389 | know (LITTLENUM_NUMBER_OF_BITS == 16); |
| 390 | for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1); |
| 391 | i >= 2; |
| 392 | i--) |
| 393 | generic_bignum[i] = generic_bignum[i - 2]; |
| 394 | |
| 395 | /* Add the new digits as the least significant new ones. */ |
| 396 | generic_bignum[0] = number & 0xffffffff; |
| 397 | generic_bignum[1] = number >> 16; |
| 398 | } |
| 399 | |
| 400 | /* Again, c is char after number, input_line_pointer->after c. */ |
| 401 | |
| 402 | if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1) |
| 403 | num_little_digits = SIZE_OF_LARGE_NUMBER - 1; |
| 404 | |
| 405 | assert (num_little_digits >= 4); |
| 406 | |
| 407 | if (num_little_digits != 8) |
| 408 | as_bad (_("a bignum with underscores must have exactly 4 words")); |
| 409 | |
| 410 | /* We might have some leading zeros. These can be trimmed to give |
| 411 | us a change to fit this constant into a small number. */ |
| 412 | while (generic_bignum[num_little_digits - 1] == 0 |
| 413 | && num_little_digits > 1) |
| 414 | num_little_digits--; |
| 415 | |
| 416 | if (num_little_digits <= 2) |
| 417 | { |
| 418 | /* will fit into 32 bits. */ |
| 419 | number = generic_bignum_to_int32 (); |
| 420 | small = 1; |
| 421 | } |
| 422 | #ifdef BFD64 |
| 423 | else if (num_little_digits <= 4) |
| 424 | { |
| 425 | /* Will fit into 64 bits. */ |
| 426 | number = generic_bignum_to_int64 (); |
| 427 | small = 1; |
| 428 | } |
| 429 | #endif |
| 430 | else |
| 431 | { |
| 432 | small = 0; |
| 433 | |
| 434 | /* Number of littlenums in the bignum. */ |
| 435 | number = num_little_digits; |
| 436 | } |
| 437 | } |
| 438 | else if (!small) |
| 439 | { |
| 440 | /* We saw a lot of digits. manufacture a bignum the hard way. */ |
| 441 | LITTLENUM_TYPE *leader; /* -> high order littlenum of the bignum. */ |
| 442 | LITTLENUM_TYPE *pointer; /* -> littlenum we are frobbing now. */ |
| 443 | long carry; |
| 444 | |
| 445 | leader = generic_bignum; |
| 446 | generic_bignum[0] = 0; |
| 447 | generic_bignum[1] = 0; |
| 448 | generic_bignum[2] = 0; |
| 449 | generic_bignum[3] = 0; |
| 450 | input_line_pointer = start; /* -> 1st digit. */ |
| 451 | c = *input_line_pointer++; |
| 452 | for (; (carry = hex_value (c)) < maxdig; c = *input_line_pointer++) |
| 453 | { |
| 454 | for (pointer = generic_bignum; pointer <= leader; pointer++) |
| 455 | { |
| 456 | long work; |
| 457 | |
| 458 | work = carry + radix * *pointer; |
| 459 | *pointer = work & LITTLENUM_MASK; |
| 460 | carry = work >> LITTLENUM_NUMBER_OF_BITS; |
| 461 | } |
| 462 | if (carry) |
| 463 | { |
| 464 | if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 1) |
| 465 | { |
| 466 | /* Room to grow a longer bignum. */ |
| 467 | *++leader = carry; |
| 468 | } |
| 469 | } |
| 470 | } |
| 471 | /* Again, c is char after number. */ |
| 472 | /* input_line_pointer -> after c. */ |
| 473 | know (LITTLENUM_NUMBER_OF_BITS == 16); |
| 474 | if (leader < generic_bignum + 2) |
| 475 | { |
| 476 | /* Will fit into 32 bits. */ |
| 477 | number = generic_bignum_to_int32 (); |
| 478 | small = 1; |
| 479 | } |
| 480 | #ifdef BFD64 |
| 481 | else if (leader < generic_bignum + 4) |
| 482 | { |
| 483 | /* Will fit into 64 bits. */ |
| 484 | number = generic_bignum_to_int64 (); |
| 485 | small = 1; |
| 486 | } |
| 487 | #endif |
| 488 | else |
| 489 | { |
| 490 | /* Number of littlenums in the bignum. */ |
| 491 | number = leader - generic_bignum + 1; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
| 496 | && suffix != NULL |
| 497 | && input_line_pointer - 1 == suffix) |
| 498 | c = *input_line_pointer++; |
| 499 | |
| 500 | if (small) |
| 501 | { |
| 502 | /* Here with number, in correct radix. c is the next char. |
| 503 | Note that unlike un*x, we allow "011f" "0x9f" to both mean |
| 504 | the same as the (conventional) "9f". |
| 505 | This is simply easier than checking for strict canonical |
| 506 | form. Syntax sux! */ |
| 507 | |
| 508 | if (LOCAL_LABELS_FB && c == 'b') |
| 509 | { |
| 510 | /* Backward ref to local label. |
| 511 | Because it is backward, expect it to be defined. */ |
| 512 | /* Construct a local label. */ |
| 513 | name = fb_label_name ((int) number, 0); |
| 514 | |
| 515 | /* Seen before, or symbol is defined: OK. */ |
| 516 | symbolP = symbol_find (name); |
| 517 | if ((symbolP != NULL) && (S_IS_DEFINED (symbolP))) |
| 518 | { |
| 519 | /* Local labels are never absolute. Don't waste time |
| 520 | checking absoluteness. */ |
| 521 | know (SEG_NORMAL (S_GET_SEGMENT (symbolP))); |
| 522 | |
| 523 | expressionP->X_op = O_symbol; |
| 524 | expressionP->X_add_symbol = symbolP; |
| 525 | } |
| 526 | else |
| 527 | { |
| 528 | /* Either not seen or not defined. */ |
| 529 | /* @@ Should print out the original string instead of |
| 530 | the parsed number. */ |
| 531 | as_bad (_("backward ref to unknown label \"%d:\""), |
| 532 | (int) number); |
| 533 | expressionP->X_op = O_constant; |
| 534 | } |
| 535 | |
| 536 | expressionP->X_add_number = 0; |
| 537 | } /* case 'b' */ |
| 538 | else if (LOCAL_LABELS_FB && c == 'f') |
| 539 | { |
| 540 | /* Forward reference. Expect symbol to be undefined or |
| 541 | unknown. undefined: seen it before. unknown: never seen |
| 542 | it before. |
| 543 | |
| 544 | Construct a local label name, then an undefined symbol. |
| 545 | Don't create a xseg frag for it: caller may do that. |
| 546 | Just return it as never seen before. */ |
| 547 | name = fb_label_name ((int) number, 1); |
| 548 | symbolP = symbol_find_or_make (name); |
| 549 | /* We have no need to check symbol properties. */ |
| 550 | #ifndef many_segments |
| 551 | /* Since "know" puts its arg into a "string", we |
| 552 | can't have newlines in the argument. */ |
| 553 | know (S_GET_SEGMENT (symbolP) == undefined_section || S_GET_SEGMENT (symbolP) == text_section || S_GET_SEGMENT (symbolP) == data_section); |
| 554 | #endif |
| 555 | expressionP->X_op = O_symbol; |
| 556 | expressionP->X_add_symbol = symbolP; |
| 557 | expressionP->X_add_number = 0; |
| 558 | } /* case 'f' */ |
| 559 | else if (LOCAL_LABELS_DOLLAR && c == '$') |
| 560 | { |
| 561 | /* If the dollar label is *currently* defined, then this is just |
| 562 | another reference to it. If it is not *currently* defined, |
| 563 | then this is a fresh instantiation of that number, so create |
| 564 | it. */ |
| 565 | |
| 566 | if (dollar_label_defined ((long) number)) |
| 567 | { |
| 568 | name = dollar_label_name ((long) number, 0); |
| 569 | symbolP = symbol_find (name); |
| 570 | know (symbolP != NULL); |
| 571 | } |
| 572 | else |
| 573 | { |
| 574 | name = dollar_label_name ((long) number, 1); |
| 575 | symbolP = symbol_find_or_make (name); |
| 576 | } |
| 577 | |
| 578 | expressionP->X_op = O_symbol; |
| 579 | expressionP->X_add_symbol = symbolP; |
| 580 | expressionP->X_add_number = 0; |
| 581 | } /* case '$' */ |
| 582 | else |
| 583 | { |
| 584 | expressionP->X_op = O_constant; |
| 585 | expressionP->X_add_number = number; |
| 586 | input_line_pointer--; /* Restore following character. */ |
| 587 | } /* Really just a number. */ |
| 588 | } |
| 589 | else |
| 590 | { |
| 591 | /* Not a small number. */ |
| 592 | expressionP->X_op = O_big; |
| 593 | expressionP->X_add_number = number; /* Number of littlenums. */ |
| 594 | input_line_pointer--; /* -> char following number. */ |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* Parse an MRI multi character constant. */ |
| 599 | |
| 600 | static void |
| 601 | mri_char_constant (expressionS *expressionP) |
| 602 | { |
| 603 | int i; |
| 604 | |
| 605 | if (*input_line_pointer == '\'' |
| 606 | && input_line_pointer[1] != '\'') |
| 607 | { |
| 608 | expressionP->X_op = O_constant; |
| 609 | expressionP->X_add_number = 0; |
| 610 | return; |
| 611 | } |
| 612 | |
| 613 | /* In order to get the correct byte ordering, we must build the |
| 614 | number in reverse. */ |
| 615 | for (i = SIZE_OF_LARGE_NUMBER - 1; i >= 0; i--) |
| 616 | { |
| 617 | int j; |
| 618 | |
| 619 | generic_bignum[i] = 0; |
| 620 | for (j = 0; j < CHARS_PER_LITTLENUM; j++) |
| 621 | { |
| 622 | if (*input_line_pointer == '\'') |
| 623 | { |
| 624 | if (input_line_pointer[1] != '\'') |
| 625 | break; |
| 626 | ++input_line_pointer; |
| 627 | } |
| 628 | generic_bignum[i] <<= 8; |
| 629 | generic_bignum[i] += *input_line_pointer; |
| 630 | ++input_line_pointer; |
| 631 | } |
| 632 | |
| 633 | if (i < SIZE_OF_LARGE_NUMBER - 1) |
| 634 | { |
| 635 | /* If there is more than one littlenum, left justify the |
| 636 | last one to make it match the earlier ones. If there is |
| 637 | only one, we can just use the value directly. */ |
| 638 | for (; j < CHARS_PER_LITTLENUM; j++) |
| 639 | generic_bignum[i] <<= 8; |
| 640 | } |
| 641 | |
| 642 | if (*input_line_pointer == '\'' |
| 643 | && input_line_pointer[1] != '\'') |
| 644 | break; |
| 645 | } |
| 646 | |
| 647 | if (i < 0) |
| 648 | { |
| 649 | as_bad (_("character constant too large")); |
| 650 | i = 0; |
| 651 | } |
| 652 | |
| 653 | if (i > 0) |
| 654 | { |
| 655 | int c; |
| 656 | int j; |
| 657 | |
| 658 | c = SIZE_OF_LARGE_NUMBER - i; |
| 659 | for (j = 0; j < c; j++) |
| 660 | generic_bignum[j] = generic_bignum[i + j]; |
| 661 | i = c; |
| 662 | } |
| 663 | |
| 664 | know (LITTLENUM_NUMBER_OF_BITS == 16); |
| 665 | if (i > 2) |
| 666 | { |
| 667 | expressionP->X_op = O_big; |
| 668 | expressionP->X_add_number = i; |
| 669 | } |
| 670 | else |
| 671 | { |
| 672 | expressionP->X_op = O_constant; |
| 673 | if (i < 2) |
| 674 | expressionP->X_add_number = generic_bignum[0] & LITTLENUM_MASK; |
| 675 | else |
| 676 | expressionP->X_add_number = |
| 677 | (((generic_bignum[1] & LITTLENUM_MASK) |
| 678 | << LITTLENUM_NUMBER_OF_BITS) |
| 679 | | (generic_bignum[0] & LITTLENUM_MASK)); |
| 680 | } |
| 681 | |
| 682 | /* Skip the final closing quote. */ |
| 683 | ++input_line_pointer; |
| 684 | } |
| 685 | |
| 686 | /* Return an expression representing the current location. This |
| 687 | handles the magic symbol `.'. */ |
| 688 | |
| 689 | static void |
| 690 | current_location (expressionS *expressionp) |
| 691 | { |
| 692 | if (now_seg == absolute_section) |
| 693 | { |
| 694 | expressionp->X_op = O_constant; |
| 695 | expressionp->X_add_number = abs_section_offset; |
| 696 | } |
| 697 | else |
| 698 | { |
| 699 | expressionp->X_op = O_symbol; |
| 700 | expressionp->X_add_symbol = symbol_temp_new_now (); |
| 701 | expressionp->X_add_number = 0; |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | /* In: Input_line_pointer points to 1st char of operand, which may |
| 706 | be a space. |
| 707 | |
| 708 | Out: An expressionS. |
| 709 | The operand may have been empty: in this case X_op == O_absent. |
| 710 | Input_line_pointer->(next non-blank) char after operand. */ |
| 711 | |
| 712 | static segT |
| 713 | operand (expressionS *expressionP, enum expr_mode mode) |
| 714 | { |
| 715 | char c; |
| 716 | symbolS *symbolP; /* Points to symbol. */ |
| 717 | char *name; /* Points to name of symbol. */ |
| 718 | segT segment; |
| 719 | |
| 720 | /* All integers are regarded as unsigned unless they are negated. |
| 721 | This is because the only thing which cares whether a number is |
| 722 | unsigned is the code in emit_expr which extends constants into |
| 723 | bignums. It should only sign extend negative numbers, so that |
| 724 | something like ``.quad 0x80000000'' is not sign extended even |
| 725 | though it appears negative if valueT is 32 bits. */ |
| 726 | expressionP->X_unsigned = 1; |
| 727 | |
| 728 | /* Digits, assume it is a bignum. */ |
| 729 | |
| 730 | SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */ |
| 731 | c = *input_line_pointer++; /* input_line_pointer -> past char in c. */ |
| 732 | |
| 733 | if (is_end_of_line[(unsigned char) c]) |
| 734 | goto eol; |
| 735 | |
| 736 | switch (c) |
| 737 | { |
| 738 | case '1': |
| 739 | case '2': |
| 740 | case '3': |
| 741 | case '4': |
| 742 | case '5': |
| 743 | case '6': |
| 744 | case '7': |
| 745 | case '8': |
| 746 | case '9': |
| 747 | input_line_pointer--; |
| 748 | |
| 749 | integer_constant ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
| 750 | ? 0 : 10, |
| 751 | expressionP); |
| 752 | break; |
| 753 | |
| 754 | #ifdef LITERAL_PREFIXDOLLAR_HEX |
| 755 | case '$': |
| 756 | /* $L is the start of a local label, not a hex constant. */ |
| 757 | if (* input_line_pointer == 'L') |
| 758 | goto isname; |
| 759 | integer_constant (16, expressionP); |
| 760 | break; |
| 761 | #endif |
| 762 | |
| 763 | #ifdef LITERAL_PREFIXPERCENT_BIN |
| 764 | case '%': |
| 765 | integer_constant (2, expressionP); |
| 766 | break; |
| 767 | #endif |
| 768 | |
| 769 | case '0': |
| 770 | /* Non-decimal radix. */ |
| 771 | |
| 772 | if (NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
| 773 | { |
| 774 | char *s; |
| 775 | |
| 776 | /* Check for a hex or float constant. */ |
| 777 | for (s = input_line_pointer; hex_p (*s); s++) |
| 778 | ; |
| 779 | if (*s == 'h' || *s == 'H' || *input_line_pointer == '.') |
| 780 | { |
| 781 | --input_line_pointer; |
| 782 | integer_constant (0, expressionP); |
| 783 | break; |
| 784 | } |
| 785 | } |
| 786 | c = *input_line_pointer; |
| 787 | switch (c) |
| 788 | { |
| 789 | case 'o': |
| 790 | case 'O': |
| 791 | case 'q': |
| 792 | case 'Q': |
| 793 | case '8': |
| 794 | case '9': |
| 795 | if (NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
| 796 | { |
| 797 | integer_constant (0, expressionP); |
| 798 | break; |
| 799 | } |
| 800 | /* Fall through. */ |
| 801 | default: |
| 802 | default_case: |
| 803 | if (c && strchr (FLT_CHARS, c)) |
| 804 | { |
| 805 | input_line_pointer++; |
| 806 | floating_constant (expressionP); |
| 807 | expressionP->X_add_number = - TOLOWER (c); |
| 808 | } |
| 809 | else |
| 810 | { |
| 811 | /* The string was only zero. */ |
| 812 | expressionP->X_op = O_constant; |
| 813 | expressionP->X_add_number = 0; |
| 814 | } |
| 815 | |
| 816 | break; |
| 817 | |
| 818 | case 'x': |
| 819 | case 'X': |
| 820 | if (flag_m68k_mri) |
| 821 | goto default_case; |
| 822 | input_line_pointer++; |
| 823 | integer_constant (16, expressionP); |
| 824 | break; |
| 825 | |
| 826 | case 'b': |
| 827 | if (LOCAL_LABELS_FB && ! (flag_m68k_mri || NUMBERS_WITH_SUFFIX)) |
| 828 | { |
| 829 | /* This code used to check for '+' and '-' here, and, in |
| 830 | some conditions, fall through to call |
| 831 | integer_constant. However, that didn't make sense, |
| 832 | as integer_constant only accepts digits. */ |
| 833 | /* Some of our code elsewhere does permit digits greater |
| 834 | than the expected base; for consistency, do the same |
| 835 | here. */ |
| 836 | if (input_line_pointer[1] < '0' |
| 837 | || input_line_pointer[1] > '9') |
| 838 | { |
| 839 | /* Parse this as a back reference to label 0. */ |
| 840 | input_line_pointer--; |
| 841 | integer_constant (10, expressionP); |
| 842 | break; |
| 843 | } |
| 844 | /* Otherwise, parse this as a binary number. */ |
| 845 | } |
| 846 | /* Fall through. */ |
| 847 | case 'B': |
| 848 | input_line_pointer++; |
| 849 | if (flag_m68k_mri || NUMBERS_WITH_SUFFIX) |
| 850 | goto default_case; |
| 851 | integer_constant (2, expressionP); |
| 852 | break; |
| 853 | |
| 854 | case '0': |
| 855 | case '1': |
| 856 | case '2': |
| 857 | case '3': |
| 858 | case '4': |
| 859 | case '5': |
| 860 | case '6': |
| 861 | case '7': |
| 862 | integer_constant ((flag_m68k_mri || NUMBERS_WITH_SUFFIX) |
| 863 | ? 0 : 8, |
| 864 | expressionP); |
| 865 | break; |
| 866 | |
| 867 | case 'f': |
| 868 | if (LOCAL_LABELS_FB) |
| 869 | { |
| 870 | /* If it says "0f" and it could possibly be a floating point |
| 871 | number, make it one. Otherwise, make it a local label, |
| 872 | and try to deal with parsing the rest later. */ |
| 873 | if (!input_line_pointer[1] |
| 874 | || (is_end_of_line[0xff & input_line_pointer[1]]) |
| 875 | || strchr (FLT_CHARS, 'f') == NULL) |
| 876 | goto is_0f_label; |
| 877 | { |
| 878 | char *cp = input_line_pointer + 1; |
| 879 | int r = atof_generic (&cp, ".", EXP_CHARS, |
| 880 | &generic_floating_point_number); |
| 881 | switch (r) |
| 882 | { |
| 883 | case 0: |
| 884 | case ERROR_EXPONENT_OVERFLOW: |
| 885 | if (*cp == 'f' || *cp == 'b') |
| 886 | /* Looks like a difference expression. */ |
| 887 | goto is_0f_label; |
| 888 | else if (cp == input_line_pointer + 1) |
| 889 | /* No characters has been accepted -- looks like |
| 890 | end of operand. */ |
| 891 | goto is_0f_label; |
| 892 | else |
| 893 | goto is_0f_float; |
| 894 | default: |
| 895 | as_fatal (_("expr.c(operand): bad atof_generic return val %d"), |
| 896 | r); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | /* Okay, now we've sorted it out. We resume at one of these |
| 901 | two labels, depending on what we've decided we're probably |
| 902 | looking at. */ |
| 903 | is_0f_label: |
| 904 | input_line_pointer--; |
| 905 | integer_constant (10, expressionP); |
| 906 | break; |
| 907 | |
| 908 | is_0f_float: |
| 909 | /* Fall through. */ |
| 910 | ; |
| 911 | } |
| 912 | |
| 913 | case 'd': |
| 914 | case 'D': |
| 915 | if (flag_m68k_mri || NUMBERS_WITH_SUFFIX) |
| 916 | { |
| 917 | integer_constant (0, expressionP); |
| 918 | break; |
| 919 | } |
| 920 | /* Fall through. */ |
| 921 | case 'F': |
| 922 | case 'r': |
| 923 | case 'e': |
| 924 | case 'E': |
| 925 | case 'g': |
| 926 | case 'G': |
| 927 | input_line_pointer++; |
| 928 | floating_constant (expressionP); |
| 929 | expressionP->X_add_number = - TOLOWER (c); |
| 930 | break; |
| 931 | |
| 932 | case '$': |
| 933 | if (LOCAL_LABELS_DOLLAR) |
| 934 | { |
| 935 | integer_constant (10, expressionP); |
| 936 | break; |
| 937 | } |
| 938 | else |
| 939 | goto default_case; |
| 940 | } |
| 941 | |
| 942 | break; |
| 943 | |
| 944 | case '(': |
| 945 | #ifndef NEED_INDEX_OPERATOR |
| 946 | case '[': |
| 947 | #endif |
| 948 | /* Didn't begin with digit & not a name. */ |
| 949 | if (mode != expr_defer) |
| 950 | segment = expression (expressionP); |
| 951 | else |
| 952 | segment = deferred_expression (expressionP); |
| 953 | /* expression () will pass trailing whitespace. */ |
| 954 | if ((c == '(' && *input_line_pointer != ')') |
| 955 | || (c == '[' && *input_line_pointer != ']')) |
| 956 | as_bad (_("missing '%c'"), c == '(' ? ')' : ']'); |
| 957 | else |
| 958 | input_line_pointer++; |
| 959 | SKIP_WHITESPACE (); |
| 960 | /* Here with input_line_pointer -> char after "(...)". */ |
| 961 | return segment; |
| 962 | |
| 963 | #ifdef TC_M68K |
| 964 | case 'E': |
| 965 | if (! flag_m68k_mri || *input_line_pointer != '\'') |
| 966 | goto de_fault; |
| 967 | as_bad (_("EBCDIC constants are not supported")); |
| 968 | /* Fall through. */ |
| 969 | case 'A': |
| 970 | if (! flag_m68k_mri || *input_line_pointer != '\'') |
| 971 | goto de_fault; |
| 972 | ++input_line_pointer; |
| 973 | /* Fall through. */ |
| 974 | #endif |
| 975 | case '\'': |
| 976 | if (! flag_m68k_mri) |
| 977 | { |
| 978 | /* Warning: to conform to other people's assemblers NO |
| 979 | ESCAPEMENT is permitted for a single quote. The next |
| 980 | character, parity errors and all, is taken as the value |
| 981 | of the operand. VERY KINKY. */ |
| 982 | expressionP->X_op = O_constant; |
| 983 | expressionP->X_add_number = *input_line_pointer++; |
| 984 | break; |
| 985 | } |
| 986 | |
| 987 | mri_char_constant (expressionP); |
| 988 | break; |
| 989 | |
| 990 | #ifdef TC_M68K |
| 991 | case '"': |
| 992 | /* Double quote is the bitwise not operator in MRI mode. */ |
| 993 | if (! flag_m68k_mri) |
| 994 | goto de_fault; |
| 995 | /* Fall through. */ |
| 996 | #endif |
| 997 | case '~': |
| 998 | /* '~' is permitted to start a label on the Delta. */ |
| 999 | if (is_name_beginner (c)) |
| 1000 | goto isname; |
| 1001 | case '!': |
| 1002 | case '-': |
| 1003 | case '+': |
| 1004 | { |
| 1005 | operand (expressionP, mode); |
| 1006 | if (expressionP->X_op == O_constant) |
| 1007 | { |
| 1008 | /* input_line_pointer -> char after operand. */ |
| 1009 | if (c == '-') |
| 1010 | { |
| 1011 | expressionP->X_add_number = - expressionP->X_add_number; |
| 1012 | /* Notice: '-' may overflow: no warning is given. |
| 1013 | This is compatible with other people's |
| 1014 | assemblers. Sigh. */ |
| 1015 | expressionP->X_unsigned = 0; |
| 1016 | } |
| 1017 | else if (c == '~' || c == '"') |
| 1018 | expressionP->X_add_number = ~ expressionP->X_add_number; |
| 1019 | else if (c == '!') |
| 1020 | expressionP->X_add_number = ! expressionP->X_add_number; |
| 1021 | } |
| 1022 | else if (expressionP->X_op == O_big |
| 1023 | && expressionP->X_add_number <= 0 |
| 1024 | && c == '-' |
| 1025 | && (generic_floating_point_number.sign == '+' |
| 1026 | || generic_floating_point_number.sign == 'P')) |
| 1027 | { |
| 1028 | /* Negative flonum (eg, -1.000e0). */ |
| 1029 | if (generic_floating_point_number.sign == '+') |
| 1030 | generic_floating_point_number.sign = '-'; |
| 1031 | else |
| 1032 | generic_floating_point_number.sign = 'N'; |
| 1033 | } |
| 1034 | else if (expressionP->X_op == O_big |
| 1035 | && expressionP->X_add_number > 0) |
| 1036 | { |
| 1037 | int i; |
| 1038 | |
| 1039 | if (c == '~' || c == '-') |
| 1040 | { |
| 1041 | for (i = 0; i < expressionP->X_add_number; ++i) |
| 1042 | generic_bignum[i] = ~generic_bignum[i]; |
| 1043 | if (c == '-') |
| 1044 | for (i = 0; i < expressionP->X_add_number; ++i) |
| 1045 | { |
| 1046 | generic_bignum[i] += 1; |
| 1047 | if (generic_bignum[i]) |
| 1048 | break; |
| 1049 | } |
| 1050 | } |
| 1051 | else if (c == '!') |
| 1052 | { |
| 1053 | int nonzero = 0; |
| 1054 | for (i = 0; i < expressionP->X_add_number; ++i) |
| 1055 | { |
| 1056 | if (generic_bignum[i]) |
| 1057 | nonzero = 1; |
| 1058 | generic_bignum[i] = 0; |
| 1059 | } |
| 1060 | generic_bignum[0] = nonzero; |
| 1061 | } |
| 1062 | } |
| 1063 | else if (expressionP->X_op != O_illegal |
| 1064 | && expressionP->X_op != O_absent) |
| 1065 | { |
| 1066 | if (c != '+') |
| 1067 | { |
| 1068 | expressionP->X_add_symbol = make_expr_symbol (expressionP); |
| 1069 | if (c == '-') |
| 1070 | expressionP->X_op = O_uminus; |
| 1071 | else if (c == '~' || c == '"') |
| 1072 | expressionP->X_op = O_bit_not; |
| 1073 | else |
| 1074 | expressionP->X_op = O_logical_not; |
| 1075 | expressionP->X_add_number = 0; |
| 1076 | } |
| 1077 | } |
| 1078 | else |
| 1079 | as_warn (_("Unary operator %c ignored because bad operand follows"), |
| 1080 | c); |
| 1081 | } |
| 1082 | break; |
| 1083 | |
| 1084 | #if defined (DOLLAR_DOT) || defined (TC_M68K) |
| 1085 | case '$': |
| 1086 | /* '$' is the program counter when in MRI mode, or when |
| 1087 | DOLLAR_DOT is defined. */ |
| 1088 | #ifndef DOLLAR_DOT |
| 1089 | if (! flag_m68k_mri) |
| 1090 | goto de_fault; |
| 1091 | #endif |
| 1092 | if (DOLLAR_AMBIGU && hex_p (*input_line_pointer)) |
| 1093 | { |
| 1094 | /* In MRI mode and on Z80, '$' is also used as the prefix |
| 1095 | for a hexadecimal constant. */ |
| 1096 | integer_constant (16, expressionP); |
| 1097 | break; |
| 1098 | } |
| 1099 | |
| 1100 | if (is_part_of_name (*input_line_pointer)) |
| 1101 | goto isname; |
| 1102 | |
| 1103 | current_location (expressionP); |
| 1104 | break; |
| 1105 | #endif |
| 1106 | |
| 1107 | case '.': |
| 1108 | if (!is_part_of_name (*input_line_pointer)) |
| 1109 | { |
| 1110 | current_location (expressionP); |
| 1111 | break; |
| 1112 | } |
| 1113 | else if ((strncasecmp (input_line_pointer, "startof.", 8) == 0 |
| 1114 | && ! is_part_of_name (input_line_pointer[8])) |
| 1115 | || (strncasecmp (input_line_pointer, "sizeof.", 7) == 0 |
| 1116 | && ! is_part_of_name (input_line_pointer[7]))) |
| 1117 | { |
| 1118 | int start; |
| 1119 | |
| 1120 | start = (input_line_pointer[1] == 't' |
| 1121 | || input_line_pointer[1] == 'T'); |
| 1122 | input_line_pointer += start ? 8 : 7; |
| 1123 | SKIP_WHITESPACE (); |
| 1124 | if (*input_line_pointer != '(') |
| 1125 | as_bad (_("syntax error in .startof. or .sizeof.")); |
| 1126 | else |
| 1127 | { |
| 1128 | char *buf; |
| 1129 | |
| 1130 | ++input_line_pointer; |
| 1131 | SKIP_WHITESPACE (); |
| 1132 | name = input_line_pointer; |
| 1133 | c = get_symbol_end (); |
| 1134 | |
| 1135 | buf = (char *) xmalloc (strlen (name) + 10); |
| 1136 | if (start) |
| 1137 | sprintf (buf, ".startof.%s", name); |
| 1138 | else |
| 1139 | sprintf (buf, ".sizeof.%s", name); |
| 1140 | symbolP = symbol_make (buf); |
| 1141 | free (buf); |
| 1142 | |
| 1143 | expressionP->X_op = O_symbol; |
| 1144 | expressionP->X_add_symbol = symbolP; |
| 1145 | expressionP->X_add_number = 0; |
| 1146 | |
| 1147 | *input_line_pointer = c; |
| 1148 | SKIP_WHITESPACE (); |
| 1149 | if (*input_line_pointer != ')') |
| 1150 | as_bad (_("syntax error in .startof. or .sizeof.")); |
| 1151 | else |
| 1152 | ++input_line_pointer; |
| 1153 | } |
| 1154 | break; |
| 1155 | } |
| 1156 | else |
| 1157 | { |
| 1158 | goto isname; |
| 1159 | } |
| 1160 | |
| 1161 | case ',': |
| 1162 | eol: |
| 1163 | /* Can't imagine any other kind of operand. */ |
| 1164 | expressionP->X_op = O_absent; |
| 1165 | input_line_pointer--; |
| 1166 | break; |
| 1167 | |
| 1168 | #ifdef TC_M68K |
| 1169 | case '%': |
| 1170 | if (! flag_m68k_mri) |
| 1171 | goto de_fault; |
| 1172 | integer_constant (2, expressionP); |
| 1173 | break; |
| 1174 | |
| 1175 | case '@': |
| 1176 | if (! flag_m68k_mri) |
| 1177 | goto de_fault; |
| 1178 | integer_constant (8, expressionP); |
| 1179 | break; |
| 1180 | |
| 1181 | case ':': |
| 1182 | if (! flag_m68k_mri) |
| 1183 | goto de_fault; |
| 1184 | |
| 1185 | /* In MRI mode, this is a floating point constant represented |
| 1186 | using hexadecimal digits. */ |
| 1187 | |
| 1188 | ++input_line_pointer; |
| 1189 | integer_constant (16, expressionP); |
| 1190 | break; |
| 1191 | |
| 1192 | case '*': |
| 1193 | if (! flag_m68k_mri || is_part_of_name (*input_line_pointer)) |
| 1194 | goto de_fault; |
| 1195 | |
| 1196 | current_location (expressionP); |
| 1197 | break; |
| 1198 | #endif |
| 1199 | |
| 1200 | default: |
| 1201 | #ifdef TC_M68K |
| 1202 | de_fault: |
| 1203 | #endif |
| 1204 | if (is_name_beginner (c)) /* Here if did not begin with a digit. */ |
| 1205 | { |
| 1206 | /* Identifier begins here. |
| 1207 | This is kludged for speed, so code is repeated. */ |
| 1208 | isname: |
| 1209 | name = --input_line_pointer; |
| 1210 | c = get_symbol_end (); |
| 1211 | |
| 1212 | #ifdef md_parse_name |
| 1213 | /* This is a hook for the backend to parse certain names |
| 1214 | specially in certain contexts. If a name always has a |
| 1215 | specific value, it can often be handled by simply |
| 1216 | entering it in the symbol table. */ |
| 1217 | if (md_parse_name (name, expressionP, mode, &c)) |
| 1218 | { |
| 1219 | *input_line_pointer = c; |
| 1220 | break; |
| 1221 | } |
| 1222 | #endif |
| 1223 | |
| 1224 | #ifdef TC_I960 |
| 1225 | /* The MRI i960 assembler permits |
| 1226 | lda sizeof code,g13 |
| 1227 | FIXME: This should use md_parse_name. */ |
| 1228 | if (flag_mri |
| 1229 | && (strcasecmp (name, "sizeof") == 0 |
| 1230 | || strcasecmp (name, "startof") == 0)) |
| 1231 | { |
| 1232 | int start; |
| 1233 | char *buf; |
| 1234 | |
| 1235 | start = (name[1] == 't' |
| 1236 | || name[1] == 'T'); |
| 1237 | |
| 1238 | *input_line_pointer = c; |
| 1239 | SKIP_WHITESPACE (); |
| 1240 | |
| 1241 | name = input_line_pointer; |
| 1242 | c = get_symbol_end (); |
| 1243 | |
| 1244 | buf = (char *) xmalloc (strlen (name) + 10); |
| 1245 | if (start) |
| 1246 | sprintf (buf, ".startof.%s", name); |
| 1247 | else |
| 1248 | sprintf (buf, ".sizeof.%s", name); |
| 1249 | symbolP = symbol_make (buf); |
| 1250 | free (buf); |
| 1251 | |
| 1252 | expressionP->X_op = O_symbol; |
| 1253 | expressionP->X_add_symbol = symbolP; |
| 1254 | expressionP->X_add_number = 0; |
| 1255 | |
| 1256 | *input_line_pointer = c; |
| 1257 | SKIP_WHITESPACE (); |
| 1258 | |
| 1259 | break; |
| 1260 | } |
| 1261 | #endif |
| 1262 | |
| 1263 | symbolP = symbol_find_or_make (name); |
| 1264 | |
| 1265 | /* If we have an absolute symbol or a reg, then we know its |
| 1266 | value now. */ |
| 1267 | segment = S_GET_SEGMENT (symbolP); |
| 1268 | if (mode != expr_defer && segment == absolute_section) |
| 1269 | { |
| 1270 | expressionP->X_op = O_constant; |
| 1271 | expressionP->X_add_number = S_GET_VALUE (symbolP); |
| 1272 | } |
| 1273 | else if (mode != expr_defer && segment == reg_section) |
| 1274 | { |
| 1275 | expressionP->X_op = O_register; |
| 1276 | expressionP->X_add_number = S_GET_VALUE (symbolP); |
| 1277 | } |
| 1278 | else |
| 1279 | { |
| 1280 | expressionP->X_op = O_symbol; |
| 1281 | expressionP->X_add_symbol = symbolP; |
| 1282 | expressionP->X_add_number = 0; |
| 1283 | } |
| 1284 | *input_line_pointer = c; |
| 1285 | } |
| 1286 | else |
| 1287 | { |
| 1288 | /* Let the target try to parse it. Success is indicated by changing |
| 1289 | the X_op field to something other than O_absent and pointing |
| 1290 | input_line_pointer past the expression. If it can't parse the |
| 1291 | expression, X_op and input_line_pointer should be unchanged. */ |
| 1292 | expressionP->X_op = O_absent; |
| 1293 | --input_line_pointer; |
| 1294 | md_operand (expressionP); |
| 1295 | if (expressionP->X_op == O_absent) |
| 1296 | { |
| 1297 | ++input_line_pointer; |
| 1298 | as_bad (_("bad expression")); |
| 1299 | expressionP->X_op = O_constant; |
| 1300 | expressionP->X_add_number = 0; |
| 1301 | } |
| 1302 | } |
| 1303 | break; |
| 1304 | } |
| 1305 | |
| 1306 | /* It is more 'efficient' to clean up the expressionS when they are |
| 1307 | created. Doing it here saves lines of code. */ |
| 1308 | clean_up_expression (expressionP); |
| 1309 | SKIP_WHITESPACE (); /* -> 1st char after operand. */ |
| 1310 | know (*input_line_pointer != ' '); |
| 1311 | |
| 1312 | /* The PA port needs this information. */ |
| 1313 | if (expressionP->X_add_symbol) |
| 1314 | symbol_mark_used (expressionP->X_add_symbol); |
| 1315 | |
| 1316 | expressionP->X_add_symbol = symbol_clone_if_forward_ref (expressionP->X_add_symbol); |
| 1317 | expressionP->X_op_symbol = symbol_clone_if_forward_ref (expressionP->X_op_symbol); |
| 1318 | |
| 1319 | switch (expressionP->X_op) |
| 1320 | { |
| 1321 | default: |
| 1322 | return absolute_section; |
| 1323 | case O_symbol: |
| 1324 | return S_GET_SEGMENT (expressionP->X_add_symbol); |
| 1325 | case O_register: |
| 1326 | return reg_section; |
| 1327 | } |
| 1328 | } |
| 1329 | \f |
| 1330 | /* Internal. Simplify a struct expression for use by expr (). */ |
| 1331 | |
| 1332 | /* In: address of an expressionS. |
| 1333 | The X_op field of the expressionS may only take certain values. |
| 1334 | Elsewise we waste time special-case testing. Sigh. Ditto SEG_ABSENT. |
| 1335 | |
| 1336 | Out: expressionS may have been modified: |
| 1337 | Unused fields zeroed to help expr (). */ |
| 1338 | |
| 1339 | static void |
| 1340 | clean_up_expression (expressionS *expressionP) |
| 1341 | { |
| 1342 | switch (expressionP->X_op) |
| 1343 | { |
| 1344 | case O_illegal: |
| 1345 | case O_absent: |
| 1346 | expressionP->X_add_number = 0; |
| 1347 | /* Fall through. */ |
| 1348 | case O_big: |
| 1349 | case O_constant: |
| 1350 | case O_register: |
| 1351 | expressionP->X_add_symbol = NULL; |
| 1352 | /* Fall through. */ |
| 1353 | case O_symbol: |
| 1354 | case O_uminus: |
| 1355 | case O_bit_not: |
| 1356 | expressionP->X_op_symbol = NULL; |
| 1357 | break; |
| 1358 | default: |
| 1359 | break; |
| 1360 | } |
| 1361 | } |
| 1362 | \f |
| 1363 | /* Expression parser. */ |
| 1364 | |
| 1365 | /* We allow an empty expression, and just assume (absolute,0) silently. |
| 1366 | Unary operators and parenthetical expressions are treated as operands. |
| 1367 | As usual, Q==quantity==operand, O==operator, X==expression mnemonics. |
| 1368 | |
| 1369 | We used to do an aho/ullman shift-reduce parser, but the logic got so |
| 1370 | warped that I flushed it and wrote a recursive-descent parser instead. |
| 1371 | Now things are stable, would anybody like to write a fast parser? |
| 1372 | Most expressions are either register (which does not even reach here) |
| 1373 | or 1 symbol. Then "symbol+constant" and "symbol-symbol" are common. |
| 1374 | So I guess it doesn't really matter how inefficient more complex expressions |
| 1375 | are parsed. |
| 1376 | |
| 1377 | After expr(RANK,resultP) input_line_pointer->operator of rank <= RANK. |
| 1378 | Also, we have consumed any leading or trailing spaces (operand does that) |
| 1379 | and done all intervening operators. |
| 1380 | |
| 1381 | This returns the segment of the result, which will be |
| 1382 | absolute_section or the segment of a symbol. */ |
| 1383 | |
| 1384 | #undef __ |
| 1385 | #define __ O_illegal |
| 1386 | #ifndef O_SINGLE_EQ |
| 1387 | #define O_SINGLE_EQ O_illegal |
| 1388 | #endif |
| 1389 | |
| 1390 | /* Maps ASCII -> operators. */ |
| 1391 | static const operatorT op_encoding[256] = { |
| 1392 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1393 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1394 | |
| 1395 | __, O_bit_or_not, __, __, __, O_modulus, O_bit_and, __, |
| 1396 | __, __, O_multiply, O_add, __, O_subtract, __, O_divide, |
| 1397 | __, __, __, __, __, __, __, __, |
| 1398 | __, __, __, __, O_lt, O_SINGLE_EQ, O_gt, __, |
| 1399 | __, __, __, __, __, __, __, __, |
| 1400 | __, __, __, __, __, __, __, __, |
| 1401 | __, __, __, __, __, __, __, __, |
| 1402 | __, __, __, |
| 1403 | #ifdef NEED_INDEX_OPERATOR |
| 1404 | O_index, |
| 1405 | #else |
| 1406 | __, |
| 1407 | #endif |
| 1408 | __, __, O_bit_exclusive_or, __, |
| 1409 | __, __, __, __, __, __, __, __, |
| 1410 | __, __, __, __, __, __, __, __, |
| 1411 | __, __, __, __, __, __, __, __, |
| 1412 | __, __, __, __, O_bit_inclusive_or, __, __, __, |
| 1413 | |
| 1414 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1415 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1416 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1417 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1418 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1419 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1420 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
| 1421 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __ |
| 1422 | }; |
| 1423 | |
| 1424 | /* Rank Examples |
| 1425 | 0 operand, (expression) |
| 1426 | 1 || |
| 1427 | 2 && |
| 1428 | 3 == <> < <= >= > |
| 1429 | 4 + - |
| 1430 | 5 used for * / % in MRI mode |
| 1431 | 6 & ^ ! | |
| 1432 | 7 * / % << >> |
| 1433 | 8 unary - unary ~ |
| 1434 | */ |
| 1435 | static operator_rankT op_rank[] = { |
| 1436 | 0, /* O_illegal */ |
| 1437 | 0, /* O_absent */ |
| 1438 | 0, /* O_constant */ |
| 1439 | 0, /* O_symbol */ |
| 1440 | 0, /* O_symbol_rva */ |
| 1441 | 0, /* O_register */ |
| 1442 | 0, /* O_big */ |
| 1443 | 9, /* O_uminus */ |
| 1444 | 9, /* O_bit_not */ |
| 1445 | 9, /* O_logical_not */ |
| 1446 | 8, /* O_multiply */ |
| 1447 | 8, /* O_divide */ |
| 1448 | 8, /* O_modulus */ |
| 1449 | 8, /* O_left_shift */ |
| 1450 | 8, /* O_right_shift */ |
| 1451 | 7, /* O_bit_inclusive_or */ |
| 1452 | 7, /* O_bit_or_not */ |
| 1453 | 7, /* O_bit_exclusive_or */ |
| 1454 | 7, /* O_bit_and */ |
| 1455 | 5, /* O_add */ |
| 1456 | 5, /* O_subtract */ |
| 1457 | 4, /* O_eq */ |
| 1458 | 4, /* O_ne */ |
| 1459 | 4, /* O_lt */ |
| 1460 | 4, /* O_le */ |
| 1461 | 4, /* O_ge */ |
| 1462 | 4, /* O_gt */ |
| 1463 | 3, /* O_logical_and */ |
| 1464 | 2, /* O_logical_or */ |
| 1465 | 1, /* O_index */ |
| 1466 | 0, /* O_md1 */ |
| 1467 | 0, /* O_md2 */ |
| 1468 | 0, /* O_md3 */ |
| 1469 | 0, /* O_md4 */ |
| 1470 | 0, /* O_md5 */ |
| 1471 | 0, /* O_md6 */ |
| 1472 | 0, /* O_md7 */ |
| 1473 | 0, /* O_md8 */ |
| 1474 | 0, /* O_md9 */ |
| 1475 | 0, /* O_md10 */ |
| 1476 | 0, /* O_md11 */ |
| 1477 | 0, /* O_md12 */ |
| 1478 | 0, /* O_md13 */ |
| 1479 | 0, /* O_md14 */ |
| 1480 | 0, /* O_md15 */ |
| 1481 | 0, /* O_md16 */ |
| 1482 | }; |
| 1483 | |
| 1484 | /* Unfortunately, in MRI mode for the m68k, multiplication and |
| 1485 | division have lower precedence than the bit wise operators. This |
| 1486 | function sets the operator precedences correctly for the current |
| 1487 | mode. Also, MRI uses a different bit_not operator, and this fixes |
| 1488 | that as well. */ |
| 1489 | |
| 1490 | #define STANDARD_MUL_PRECEDENCE 8 |
| 1491 | #define MRI_MUL_PRECEDENCE 6 |
| 1492 | |
| 1493 | void |
| 1494 | expr_set_precedence (void) |
| 1495 | { |
| 1496 | if (flag_m68k_mri) |
| 1497 | { |
| 1498 | op_rank[O_multiply] = MRI_MUL_PRECEDENCE; |
| 1499 | op_rank[O_divide] = MRI_MUL_PRECEDENCE; |
| 1500 | op_rank[O_modulus] = MRI_MUL_PRECEDENCE; |
| 1501 | } |
| 1502 | else |
| 1503 | { |
| 1504 | op_rank[O_multiply] = STANDARD_MUL_PRECEDENCE; |
| 1505 | op_rank[O_divide] = STANDARD_MUL_PRECEDENCE; |
| 1506 | op_rank[O_modulus] = STANDARD_MUL_PRECEDENCE; |
| 1507 | } |
| 1508 | } |
| 1509 | |
| 1510 | /* Initialize the expression parser. */ |
| 1511 | |
| 1512 | void |
| 1513 | expr_begin (void) |
| 1514 | { |
| 1515 | expr_set_precedence (); |
| 1516 | |
| 1517 | /* Verify that X_op field is wide enough. */ |
| 1518 | { |
| 1519 | expressionS e; |
| 1520 | e.X_op = O_max; |
| 1521 | assert (e.X_op == O_max); |
| 1522 | } |
| 1523 | } |
| 1524 | \f |
| 1525 | /* Return the encoding for the operator at INPUT_LINE_POINTER, and |
| 1526 | sets NUM_CHARS to the number of characters in the operator. |
| 1527 | Does not advance INPUT_LINE_POINTER. */ |
| 1528 | |
| 1529 | static inline operatorT |
| 1530 | operator (int *num_chars) |
| 1531 | { |
| 1532 | int c; |
| 1533 | operatorT ret; |
| 1534 | |
| 1535 | c = *input_line_pointer & 0xff; |
| 1536 | *num_chars = 1; |
| 1537 | |
| 1538 | if (is_end_of_line[c]) |
| 1539 | return O_illegal; |
| 1540 | |
| 1541 | switch (c) |
| 1542 | { |
| 1543 | default: |
| 1544 | return op_encoding[c]; |
| 1545 | |
| 1546 | case '+': |
| 1547 | case '-': |
| 1548 | return op_encoding[c]; |
| 1549 | |
| 1550 | case '<': |
| 1551 | switch (input_line_pointer[1]) |
| 1552 | { |
| 1553 | default: |
| 1554 | return op_encoding[c]; |
| 1555 | case '<': |
| 1556 | ret = O_left_shift; |
| 1557 | break; |
| 1558 | case '>': |
| 1559 | ret = O_ne; |
| 1560 | break; |
| 1561 | case '=': |
| 1562 | ret = O_le; |
| 1563 | break; |
| 1564 | } |
| 1565 | *num_chars = 2; |
| 1566 | return ret; |
| 1567 | |
| 1568 | case '=': |
| 1569 | if (input_line_pointer[1] != '=') |
| 1570 | return op_encoding[c]; |
| 1571 | |
| 1572 | *num_chars = 2; |
| 1573 | return O_eq; |
| 1574 | |
| 1575 | case '>': |
| 1576 | switch (input_line_pointer[1]) |
| 1577 | { |
| 1578 | default: |
| 1579 | return op_encoding[c]; |
| 1580 | case '>': |
| 1581 | ret = O_right_shift; |
| 1582 | break; |
| 1583 | case '=': |
| 1584 | ret = O_ge; |
| 1585 | break; |
| 1586 | } |
| 1587 | *num_chars = 2; |
| 1588 | return ret; |
| 1589 | |
| 1590 | case '!': |
| 1591 | switch (input_line_pointer[1]) |
| 1592 | { |
| 1593 | case '!': |
| 1594 | /* We accept !! as equivalent to ^ for MRI compatibility. */ |
| 1595 | *num_chars = 2; |
| 1596 | return O_bit_exclusive_or; |
| 1597 | case '=': |
| 1598 | /* We accept != as equivalent to <>. */ |
| 1599 | *num_chars = 2; |
| 1600 | return O_ne; |
| 1601 | default: |
| 1602 | if (flag_m68k_mri) |
| 1603 | return O_bit_inclusive_or; |
| 1604 | return op_encoding[c]; |
| 1605 | } |
| 1606 | |
| 1607 | case '|': |
| 1608 | if (input_line_pointer[1] != '|') |
| 1609 | return op_encoding[c]; |
| 1610 | |
| 1611 | *num_chars = 2; |
| 1612 | return O_logical_or; |
| 1613 | |
| 1614 | case '&': |
| 1615 | if (input_line_pointer[1] != '&') |
| 1616 | return op_encoding[c]; |
| 1617 | |
| 1618 | *num_chars = 2; |
| 1619 | return O_logical_and; |
| 1620 | } |
| 1621 | |
| 1622 | /* NOTREACHED */ |
| 1623 | } |
| 1624 | |
| 1625 | /* Parse an expression. */ |
| 1626 | |
| 1627 | segT |
| 1628 | expr (int rankarg, /* Larger # is higher rank. */ |
| 1629 | expressionS *resultP, /* Deliver result here. */ |
| 1630 | enum expr_mode mode /* Controls behavior. */) |
| 1631 | { |
| 1632 | operator_rankT rank = (operator_rankT) rankarg; |
| 1633 | segT retval; |
| 1634 | expressionS right; |
| 1635 | operatorT op_left; |
| 1636 | operatorT op_right; |
| 1637 | int op_chars; |
| 1638 | |
| 1639 | know (rankarg >= 0); |
| 1640 | |
| 1641 | /* Save the value of dot for the fixup code. */ |
| 1642 | if (rank == 0) |
| 1643 | dot_value = frag_now_fix (); |
| 1644 | |
| 1645 | retval = operand (resultP, mode); |
| 1646 | |
| 1647 | /* operand () gobbles spaces. */ |
| 1648 | know (*input_line_pointer != ' '); |
| 1649 | |
| 1650 | op_left = operator (&op_chars); |
| 1651 | while (op_left != O_illegal && op_rank[(int) op_left] > rank) |
| 1652 | { |
| 1653 | segT rightseg; |
| 1654 | bfd_vma frag_off; |
| 1655 | |
| 1656 | input_line_pointer += op_chars; /* -> after operator. */ |
| 1657 | |
| 1658 | rightseg = expr (op_rank[(int) op_left], &right, mode); |
| 1659 | if (right.X_op == O_absent) |
| 1660 | { |
| 1661 | as_warn (_("missing operand; zero assumed")); |
| 1662 | right.X_op = O_constant; |
| 1663 | right.X_add_number = 0; |
| 1664 | right.X_add_symbol = NULL; |
| 1665 | right.X_op_symbol = NULL; |
| 1666 | } |
| 1667 | |
| 1668 | know (*input_line_pointer != ' '); |
| 1669 | |
| 1670 | if (op_left == O_index) |
| 1671 | { |
| 1672 | if (*input_line_pointer != ']') |
| 1673 | as_bad ("missing right bracket"); |
| 1674 | else |
| 1675 | { |
| 1676 | ++input_line_pointer; |
| 1677 | SKIP_WHITESPACE (); |
| 1678 | } |
| 1679 | } |
| 1680 | |
| 1681 | op_right = operator (&op_chars); |
| 1682 | |
| 1683 | know (op_right == O_illegal |
| 1684 | || op_rank[(int) op_right] <= op_rank[(int) op_left]); |
| 1685 | know ((int) op_left >= (int) O_multiply |
| 1686 | && (int) op_left <= (int) O_index); |
| 1687 | |
| 1688 | /* input_line_pointer->after right-hand quantity. */ |
| 1689 | /* left-hand quantity in resultP. */ |
| 1690 | /* right-hand quantity in right. */ |
| 1691 | /* operator in op_left. */ |
| 1692 | |
| 1693 | if (resultP->X_op == O_big) |
| 1694 | { |
| 1695 | if (resultP->X_add_number > 0) |
| 1696 | as_warn (_("left operand is a bignum; integer 0 assumed")); |
| 1697 | else |
| 1698 | as_warn (_("left operand is a float; integer 0 assumed")); |
| 1699 | resultP->X_op = O_constant; |
| 1700 | resultP->X_add_number = 0; |
| 1701 | resultP->X_add_symbol = NULL; |
| 1702 | resultP->X_op_symbol = NULL; |
| 1703 | } |
| 1704 | if (right.X_op == O_big) |
| 1705 | { |
| 1706 | if (right.X_add_number > 0) |
| 1707 | as_warn (_("right operand is a bignum; integer 0 assumed")); |
| 1708 | else |
| 1709 | as_warn (_("right operand is a float; integer 0 assumed")); |
| 1710 | right.X_op = O_constant; |
| 1711 | right.X_add_number = 0; |
| 1712 | right.X_add_symbol = NULL; |
| 1713 | right.X_op_symbol = NULL; |
| 1714 | } |
| 1715 | |
| 1716 | /* Optimize common cases. */ |
| 1717 | #ifdef md_optimize_expr |
| 1718 | if (md_optimize_expr (resultP, op_left, &right)) |
| 1719 | { |
| 1720 | /* Skip. */ |
| 1721 | ; |
| 1722 | } |
| 1723 | else |
| 1724 | #endif |
| 1725 | if (op_left == O_add && right.X_op == O_constant) |
| 1726 | { |
| 1727 | /* X + constant. */ |
| 1728 | resultP->X_add_number += right.X_add_number; |
| 1729 | } |
| 1730 | /* This case comes up in PIC code. */ |
| 1731 | else if (op_left == O_subtract |
| 1732 | && right.X_op == O_symbol |
| 1733 | && resultP->X_op == O_symbol |
| 1734 | && retval == rightseg |
| 1735 | && (SEG_NORMAL (rightseg) |
| 1736 | || right.X_add_symbol == resultP->X_add_symbol) |
| 1737 | && frag_offset_fixed_p (symbol_get_frag (resultP->X_add_symbol), |
| 1738 | symbol_get_frag (right.X_add_symbol), |
| 1739 | &frag_off)) |
| 1740 | { |
| 1741 | resultP->X_add_number -= right.X_add_number; |
| 1742 | resultP->X_add_number -= frag_off / OCTETS_PER_BYTE; |
| 1743 | resultP->X_add_number += (S_GET_VALUE (resultP->X_add_symbol) |
| 1744 | - S_GET_VALUE (right.X_add_symbol)); |
| 1745 | resultP->X_op = O_constant; |
| 1746 | resultP->X_add_symbol = 0; |
| 1747 | } |
| 1748 | else if (op_left == O_subtract && right.X_op == O_constant) |
| 1749 | { |
| 1750 | /* X - constant. */ |
| 1751 | resultP->X_add_number -= right.X_add_number; |
| 1752 | } |
| 1753 | else if (op_left == O_add && resultP->X_op == O_constant) |
| 1754 | { |
| 1755 | /* Constant + X. */ |
| 1756 | resultP->X_op = right.X_op; |
| 1757 | resultP->X_add_symbol = right.X_add_symbol; |
| 1758 | resultP->X_op_symbol = right.X_op_symbol; |
| 1759 | resultP->X_add_number += right.X_add_number; |
| 1760 | retval = rightseg; |
| 1761 | } |
| 1762 | else if (resultP->X_op == O_constant && right.X_op == O_constant) |
| 1763 | { |
| 1764 | /* Constant OP constant. */ |
| 1765 | offsetT v = right.X_add_number; |
| 1766 | if (v == 0 && (op_left == O_divide || op_left == O_modulus)) |
| 1767 | { |
| 1768 | as_warn (_("division by zero")); |
| 1769 | v = 1; |
| 1770 | } |
| 1771 | switch (op_left) |
| 1772 | { |
| 1773 | default: abort (); |
| 1774 | case O_multiply: resultP->X_add_number *= v; break; |
| 1775 | case O_divide: resultP->X_add_number /= v; break; |
| 1776 | case O_modulus: resultP->X_add_number %= v; break; |
| 1777 | case O_left_shift: resultP->X_add_number <<= v; break; |
| 1778 | case O_right_shift: |
| 1779 | /* We always use unsigned shifts, to avoid relying on |
| 1780 | characteristics of the compiler used to compile gas. */ |
| 1781 | resultP->X_add_number = |
| 1782 | (offsetT) ((valueT) resultP->X_add_number >> (valueT) v); |
| 1783 | break; |
| 1784 | case O_bit_inclusive_or: resultP->X_add_number |= v; break; |
| 1785 | case O_bit_or_not: resultP->X_add_number |= ~v; break; |
| 1786 | case O_bit_exclusive_or: resultP->X_add_number ^= v; break; |
| 1787 | case O_bit_and: resultP->X_add_number &= v; break; |
| 1788 | /* Constant + constant (O_add) is handled by the |
| 1789 | previous if statement for constant + X, so is omitted |
| 1790 | here. */ |
| 1791 | case O_subtract: resultP->X_add_number -= v; break; |
| 1792 | case O_eq: |
| 1793 | resultP->X_add_number = |
| 1794 | resultP->X_add_number == v ? ~ (offsetT) 0 : 0; |
| 1795 | break; |
| 1796 | case O_ne: |
| 1797 | resultP->X_add_number = |
| 1798 | resultP->X_add_number != v ? ~ (offsetT) 0 : 0; |
| 1799 | break; |
| 1800 | case O_lt: |
| 1801 | resultP->X_add_number = |
| 1802 | resultP->X_add_number < v ? ~ (offsetT) 0 : 0; |
| 1803 | break; |
| 1804 | case O_le: |
| 1805 | resultP->X_add_number = |
| 1806 | resultP->X_add_number <= v ? ~ (offsetT) 0 : 0; |
| 1807 | break; |
| 1808 | case O_ge: |
| 1809 | resultP->X_add_number = |
| 1810 | resultP->X_add_number >= v ? ~ (offsetT) 0 : 0; |
| 1811 | break; |
| 1812 | case O_gt: |
| 1813 | resultP->X_add_number = |
| 1814 | resultP->X_add_number > v ? ~ (offsetT) 0 : 0; |
| 1815 | break; |
| 1816 | case O_logical_and: |
| 1817 | resultP->X_add_number = resultP->X_add_number && v; |
| 1818 | break; |
| 1819 | case O_logical_or: |
| 1820 | resultP->X_add_number = resultP->X_add_number || v; |
| 1821 | break; |
| 1822 | } |
| 1823 | } |
| 1824 | else if (resultP->X_op == O_symbol |
| 1825 | && right.X_op == O_symbol |
| 1826 | && (op_left == O_add |
| 1827 | || op_left == O_subtract |
| 1828 | || (resultP->X_add_number == 0 |
| 1829 | && right.X_add_number == 0))) |
| 1830 | { |
| 1831 | /* Symbol OP symbol. */ |
| 1832 | resultP->X_op = op_left; |
| 1833 | resultP->X_op_symbol = right.X_add_symbol; |
| 1834 | if (op_left == O_add) |
| 1835 | resultP->X_add_number += right.X_add_number; |
| 1836 | else if (op_left == O_subtract) |
| 1837 | { |
| 1838 | resultP->X_add_number -= right.X_add_number; |
| 1839 | if (retval == rightseg && SEG_NORMAL (retval)) |
| 1840 | { |
| 1841 | retval = absolute_section; |
| 1842 | rightseg = absolute_section; |
| 1843 | } |
| 1844 | } |
| 1845 | } |
| 1846 | else |
| 1847 | { |
| 1848 | /* The general case. */ |
| 1849 | resultP->X_add_symbol = make_expr_symbol (resultP); |
| 1850 | resultP->X_op_symbol = make_expr_symbol (&right); |
| 1851 | resultP->X_op = op_left; |
| 1852 | resultP->X_add_number = 0; |
| 1853 | resultP->X_unsigned = 1; |
| 1854 | } |
| 1855 | |
| 1856 | if (retval != rightseg) |
| 1857 | { |
| 1858 | if (! SEG_NORMAL (retval)) |
| 1859 | { |
| 1860 | if (retval != undefined_section || SEG_NORMAL (rightseg)) |
| 1861 | retval = rightseg; |
| 1862 | } |
| 1863 | else if (SEG_NORMAL (rightseg) |
| 1864 | #ifdef DIFF_EXPR_OK |
| 1865 | && op_left != O_subtract |
| 1866 | #endif |
| 1867 | ) |
| 1868 | as_bad (_("operation combines symbols in different segments")); |
| 1869 | } |
| 1870 | |
| 1871 | op_left = op_right; |
| 1872 | } /* While next operator is >= this rank. */ |
| 1873 | |
| 1874 | /* The PA port needs this information. */ |
| 1875 | if (resultP->X_add_symbol) |
| 1876 | symbol_mark_used (resultP->X_add_symbol); |
| 1877 | |
| 1878 | if (rank == 0 && mode == expr_evaluate) |
| 1879 | resolve_expression (resultP); |
| 1880 | |
| 1881 | return resultP->X_op == O_constant ? absolute_section : retval; |
| 1882 | } |
| 1883 | |
| 1884 | /* Resolve an expression without changing any symbols/sub-expressions |
| 1885 | used. */ |
| 1886 | |
| 1887 | int |
| 1888 | resolve_expression (expressionS *expressionP) |
| 1889 | { |
| 1890 | /* Help out with CSE. */ |
| 1891 | valueT final_val = expressionP->X_add_number; |
| 1892 | symbolS *add_symbol = expressionP->X_add_symbol; |
| 1893 | symbolS *op_symbol = expressionP->X_op_symbol; |
| 1894 | operatorT op = expressionP->X_op; |
| 1895 | valueT left, right; |
| 1896 | segT seg_left, seg_right; |
| 1897 | fragS *frag_left, *frag_right; |
| 1898 | bfd_vma frag_off; |
| 1899 | |
| 1900 | switch (op) |
| 1901 | { |
| 1902 | default: |
| 1903 | return 0; |
| 1904 | |
| 1905 | case O_constant: |
| 1906 | case O_register: |
| 1907 | left = 0; |
| 1908 | break; |
| 1909 | |
| 1910 | case O_symbol: |
| 1911 | case O_symbol_rva: |
| 1912 | if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left)) |
| 1913 | return 0; |
| 1914 | |
| 1915 | break; |
| 1916 | |
| 1917 | case O_uminus: |
| 1918 | case O_bit_not: |
| 1919 | case O_logical_not: |
| 1920 | if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left)) |
| 1921 | return 0; |
| 1922 | |
| 1923 | if (seg_left != absolute_section) |
| 1924 | return 0; |
| 1925 | |
| 1926 | if (op == O_logical_not) |
| 1927 | left = !left; |
| 1928 | else if (op == O_uminus) |
| 1929 | left = -left; |
| 1930 | else |
| 1931 | left = ~left; |
| 1932 | op = O_constant; |
| 1933 | break; |
| 1934 | |
| 1935 | case O_multiply: |
| 1936 | case O_divide: |
| 1937 | case O_modulus: |
| 1938 | case O_left_shift: |
| 1939 | case O_right_shift: |
| 1940 | case O_bit_inclusive_or: |
| 1941 | case O_bit_or_not: |
| 1942 | case O_bit_exclusive_or: |
| 1943 | case O_bit_and: |
| 1944 | case O_add: |
| 1945 | case O_subtract: |
| 1946 | case O_eq: |
| 1947 | case O_ne: |
| 1948 | case O_lt: |
| 1949 | case O_le: |
| 1950 | case O_ge: |
| 1951 | case O_gt: |
| 1952 | case O_logical_and: |
| 1953 | case O_logical_or: |
| 1954 | if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left) |
| 1955 | || !snapshot_symbol (&op_symbol, &right, &seg_right, &frag_right)) |
| 1956 | return 0; |
| 1957 | |
| 1958 | /* Simplify addition or subtraction of a constant by folding the |
| 1959 | constant into X_add_number. */ |
| 1960 | if (op == O_add) |
| 1961 | { |
| 1962 | if (seg_right == absolute_section) |
| 1963 | { |
| 1964 | final_val += right; |
| 1965 | op = O_symbol; |
| 1966 | break; |
| 1967 | } |
| 1968 | else if (seg_left == absolute_section) |
| 1969 | { |
| 1970 | final_val += left; |
| 1971 | left = right; |
| 1972 | seg_left = seg_right; |
| 1973 | add_symbol = op_symbol; |
| 1974 | op = O_symbol; |
| 1975 | break; |
| 1976 | } |
| 1977 | } |
| 1978 | else if (op == O_subtract) |
| 1979 | { |
| 1980 | if (seg_right == absolute_section) |
| 1981 | { |
| 1982 | final_val -= right; |
| 1983 | op = O_symbol; |
| 1984 | break; |
| 1985 | } |
| 1986 | } |
| 1987 | |
| 1988 | /* Equality and non-equality tests are permitted on anything. |
| 1989 | Subtraction, and other comparison operators are permitted if |
| 1990 | both operands are in the same section. |
| 1991 | Shifts by constant zero are permitted on anything. |
| 1992 | Multiplies, bit-ors, and bit-ands with constant zero are |
| 1993 | permitted on anything. |
| 1994 | Multiplies and divides by constant one are permitted on |
| 1995 | anything. |
| 1996 | Binary operations with both operands being the same register |
| 1997 | or undefined symbol are permitted if the result doesn't depend |
| 1998 | on the input value. |
| 1999 | Otherwise, both operands must be absolute. We already handled |
| 2000 | the case of addition or subtraction of a constant above. */ |
| 2001 | frag_off = 0; |
| 2002 | if (!(seg_left == absolute_section |
| 2003 | && seg_right == absolute_section) |
| 2004 | && !(op == O_eq || op == O_ne) |
| 2005 | && !((op == O_subtract |
| 2006 | || op == O_lt || op == O_le || op == O_ge || op == O_gt) |
| 2007 | && seg_left == seg_right |
| 2008 | && (finalize_syms |
| 2009 | || frag_offset_fixed_p (frag_left, frag_right, &frag_off)) |
| 2010 | && (seg_left != reg_section || left == right) |
| 2011 | && (seg_left != undefined_section || add_symbol == op_symbol))) |
| 2012 | { |
| 2013 | if ((seg_left == absolute_section && left == 0) |
| 2014 | || (seg_right == absolute_section && right == 0)) |
| 2015 | { |
| 2016 | if (op == O_bit_exclusive_or || op == O_bit_inclusive_or) |
| 2017 | { |
| 2018 | if (seg_right != absolute_section || right != 0) |
| 2019 | { |
| 2020 | seg_left = seg_right; |
| 2021 | left = right; |
| 2022 | add_symbol = op_symbol; |
| 2023 | } |
| 2024 | op = O_symbol; |
| 2025 | break; |
| 2026 | } |
| 2027 | else if (op == O_left_shift || op == O_right_shift) |
| 2028 | { |
| 2029 | if (seg_left != absolute_section || left != 0) |
| 2030 | { |
| 2031 | op = O_symbol; |
| 2032 | break; |
| 2033 | } |
| 2034 | } |
| 2035 | else if (op != O_multiply |
| 2036 | && op != O_bit_or_not && op != O_bit_and) |
| 2037 | return 0; |
| 2038 | } |
| 2039 | else if (op == O_multiply |
| 2040 | && seg_left == absolute_section && left == 1) |
| 2041 | { |
| 2042 | seg_left = seg_right; |
| 2043 | left = right; |
| 2044 | add_symbol = op_symbol; |
| 2045 | op = O_symbol; |
| 2046 | break; |
| 2047 | } |
| 2048 | else if ((op == O_multiply || op == O_divide) |
| 2049 | && seg_right == absolute_section && right == 1) |
| 2050 | { |
| 2051 | op = O_symbol; |
| 2052 | break; |
| 2053 | } |
| 2054 | else if (left != right |
| 2055 | || ((seg_left != reg_section || seg_right != reg_section) |
| 2056 | && (seg_left != undefined_section |
| 2057 | || seg_right != undefined_section |
| 2058 | || add_symbol != op_symbol))) |
| 2059 | return 0; |
| 2060 | else if (op == O_bit_and || op == O_bit_inclusive_or) |
| 2061 | { |
| 2062 | op = O_symbol; |
| 2063 | break; |
| 2064 | } |
| 2065 | else if (op != O_bit_exclusive_or && op != O_bit_or_not) |
| 2066 | return 0; |
| 2067 | } |
| 2068 | |
| 2069 | right += frag_off / OCTETS_PER_BYTE; |
| 2070 | switch (op) |
| 2071 | { |
| 2072 | case O_add: left += right; break; |
| 2073 | case O_subtract: left -= right; break; |
| 2074 | case O_multiply: left *= right; break; |
| 2075 | case O_divide: |
| 2076 | if (right == 0) |
| 2077 | return 0; |
| 2078 | left = (offsetT) left / (offsetT) right; |
| 2079 | break; |
| 2080 | case O_modulus: |
| 2081 | if (right == 0) |
| 2082 | return 0; |
| 2083 | left = (offsetT) left % (offsetT) right; |
| 2084 | break; |
| 2085 | case O_left_shift: left <<= right; break; |
| 2086 | case O_right_shift: left >>= right; break; |
| 2087 | case O_bit_inclusive_or: left |= right; break; |
| 2088 | case O_bit_or_not: left |= ~right; break; |
| 2089 | case O_bit_exclusive_or: left ^= right; break; |
| 2090 | case O_bit_and: left &= right; break; |
| 2091 | case O_eq: |
| 2092 | case O_ne: |
| 2093 | left = (left == right |
| 2094 | && seg_left == seg_right |
| 2095 | && (finalize_syms || frag_left == frag_right) |
| 2096 | && (seg_left != undefined_section |
| 2097 | || add_symbol == op_symbol) |
| 2098 | ? ~ (valueT) 0 : 0); |
| 2099 | if (op == O_ne) |
| 2100 | left = ~left; |
| 2101 | break; |
| 2102 | case O_lt: |
| 2103 | left = (offsetT) left < (offsetT) right ? ~ (valueT) 0 : 0; |
| 2104 | break; |
| 2105 | case O_le: |
| 2106 | left = (offsetT) left <= (offsetT) right ? ~ (valueT) 0 : 0; |
| 2107 | break; |
| 2108 | case O_ge: |
| 2109 | left = (offsetT) left >= (offsetT) right ? ~ (valueT) 0 : 0; |
| 2110 | break; |
| 2111 | case O_gt: |
| 2112 | left = (offsetT) left > (offsetT) right ? ~ (valueT) 0 : 0; |
| 2113 | break; |
| 2114 | case O_logical_and: left = left && right; break; |
| 2115 | case O_logical_or: left = left || right; break; |
| 2116 | default: abort (); |
| 2117 | } |
| 2118 | |
| 2119 | op = O_constant; |
| 2120 | break; |
| 2121 | } |
| 2122 | |
| 2123 | if (op == O_symbol) |
| 2124 | { |
| 2125 | if (seg_left == absolute_section) |
| 2126 | op = O_constant; |
| 2127 | else if (seg_left == reg_section && final_val == 0) |
| 2128 | op = O_register; |
| 2129 | else if (add_symbol != expressionP->X_add_symbol) |
| 2130 | final_val += left; |
| 2131 | expressionP->X_add_symbol = add_symbol; |
| 2132 | } |
| 2133 | expressionP->X_op = op; |
| 2134 | |
| 2135 | if (op == O_constant || op == O_register) |
| 2136 | final_val += left; |
| 2137 | expressionP->X_add_number = final_val; |
| 2138 | |
| 2139 | return 1; |
| 2140 | } |
| 2141 | \f |
| 2142 | /* This lives here because it belongs equally in expr.c & read.c. |
| 2143 | expr.c is just a branch office read.c anyway, and putting it |
| 2144 | here lessens the crowd at read.c. |
| 2145 | |
| 2146 | Assume input_line_pointer is at start of symbol name. |
| 2147 | Advance input_line_pointer past symbol name. |
| 2148 | Turn that character into a '\0', returning its former value. |
| 2149 | This allows a string compare (RMS wants symbol names to be strings) |
| 2150 | of the symbol name. |
| 2151 | There will always be a char following symbol name, because all good |
| 2152 | lines end in end-of-line. */ |
| 2153 | |
| 2154 | char |
| 2155 | get_symbol_end (void) |
| 2156 | { |
| 2157 | char c; |
| 2158 | |
| 2159 | /* We accept \001 in a name in case this is being called with a |
| 2160 | constructed string. */ |
| 2161 | if (is_name_beginner (c = *input_line_pointer++) || c == '\001') |
| 2162 | { |
| 2163 | while (is_part_of_name (c = *input_line_pointer++) |
| 2164 | || c == '\001') |
| 2165 | ; |
| 2166 | if (is_name_ender (c)) |
| 2167 | c = *input_line_pointer++; |
| 2168 | } |
| 2169 | *--input_line_pointer = 0; |
| 2170 | return (c); |
| 2171 | } |
| 2172 | |
| 2173 | unsigned int |
| 2174 | get_single_number (void) |
| 2175 | { |
| 2176 | expressionS exp; |
| 2177 | operand (&exp, expr_normal); |
| 2178 | return exp.X_add_number; |
| 2179 | } |