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252b5132 | 1 | /* expr.c -operands, expressions- |
f7e42eb4 | 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
9d0e75cb | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
252b5132 RH |
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 2, 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 | |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
252b5132 | 22 | |
929b12bc KH |
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. */ | |
252b5132 | 27 | |
252b5132 RH |
28 | #include <string.h> |
29 | #define min(a, b) ((a) < (b) ? (a) : (b)) | |
30 | ||
31 | #include "as.h" | |
3882b010 | 32 | #include "safe-ctype.h" |
252b5132 RH |
33 | #include "obstack.h" |
34 | ||
dd625418 KH |
35 | static void floating_constant (expressionS * expressionP); |
36 | static valueT generic_bignum_to_int32 (void); | |
6d4d30bb | 37 | #ifdef BFD64 |
dd625418 | 38 | static valueT generic_bignum_to_int64 (void); |
6d4d30bb | 39 | #endif |
dd625418 KH |
40 | static void integer_constant (int radix, expressionS * expressionP); |
41 | static void mri_char_constant (expressionS *); | |
42 | static void current_location (expressionS *); | |
43 | static void clean_up_expression (expressionS * expressionP); | |
44 | static segT operand (expressionS *); | |
45 | static operatorT operator (int *); | |
252b5132 RH |
46 | |
47 | extern const char EXP_CHARS[], FLT_CHARS[]; | |
48 | ||
49 | /* We keep a mapping of expression symbols to file positions, so that | |
50 | we can provide better error messages. */ | |
51 | ||
e6c774b4 | 52 | struct expr_symbol_line { |
252b5132 RH |
53 | struct expr_symbol_line *next; |
54 | symbolS *sym; | |
55 | char *file; | |
56 | unsigned int line; | |
57 | }; | |
58 | ||
59 | static struct expr_symbol_line *expr_symbol_lines; | |
60 | \f | |
61 | /* Build a dummy symbol to hold a complex expression. This is how we | |
62 | build expressions up out of other expressions. The symbol is put | |
63 | into the fake section expr_section. */ | |
64 | ||
65 | symbolS * | |
dd625418 | 66 | make_expr_symbol (expressionS *expressionP) |
252b5132 RH |
67 | { |
68 | expressionS zero; | |
252b5132 RH |
69 | symbolS *symbolP; |
70 | struct expr_symbol_line *n; | |
71 | ||
72 | if (expressionP->X_op == O_symbol | |
73 | && expressionP->X_add_number == 0) | |
74 | return expressionP->X_add_symbol; | |
75 | ||
76 | if (expressionP->X_op == O_big) | |
77 | { | |
78 | /* This won't work, because the actual value is stored in | |
02000999 AM |
79 | generic_floating_point_number or generic_bignum, and we are |
80 | going to lose it if we haven't already. */ | |
252b5132 | 81 | if (expressionP->X_add_number > 0) |
0e389e77 | 82 | as_bad (_("bignum invalid")); |
252b5132 | 83 | else |
0e389e77 | 84 | as_bad (_("floating point number invalid")); |
252b5132 RH |
85 | zero.X_op = O_constant; |
86 | zero.X_add_number = 0; | |
87 | zero.X_unsigned = 0; | |
88 | clean_up_expression (&zero); | |
89 | expressionP = &zero; | |
90 | } | |
91 | ||
252b5132 RH |
92 | /* Putting constant symbols in absolute_section rather than |
93 | expr_section is convenient for the old a.out code, for which | |
94 | S_GET_SEGMENT does not always retrieve the value put in by | |
95 | S_SET_SEGMENT. */ | |
756d1d01 | 96 | symbolP = symbol_create (FAKE_LABEL_NAME, |
252b5132 RH |
97 | (expressionP->X_op == O_constant |
98 | ? absolute_section | |
99 | : expr_section), | |
100 | 0, &zero_address_frag); | |
49309057 | 101 | symbol_set_value_expression (symbolP, expressionP); |
252b5132 RH |
102 | |
103 | if (expressionP->X_op == O_constant) | |
6386f3a7 | 104 | resolve_symbol_value (symbolP); |
252b5132 RH |
105 | |
106 | n = (struct expr_symbol_line *) xmalloc (sizeof *n); | |
107 | n->sym = symbolP; | |
108 | as_where (&n->file, &n->line); | |
109 | n->next = expr_symbol_lines; | |
110 | expr_symbol_lines = n; | |
111 | ||
112 | return symbolP; | |
113 | } | |
114 | ||
115 | /* Return the file and line number for an expr symbol. Return | |
116 | non-zero if something was found, 0 if no information is known for | |
117 | the symbol. */ | |
118 | ||
119 | int | |
dd625418 | 120 | expr_symbol_where (symbolS *sym, char **pfile, unsigned int *pline) |
252b5132 RH |
121 | { |
122 | register struct expr_symbol_line *l; | |
123 | ||
124 | for (l = expr_symbol_lines; l != NULL; l = l->next) | |
125 | { | |
126 | if (l->sym == sym) | |
127 | { | |
128 | *pfile = l->file; | |
129 | *pline = l->line; | |
130 | return 1; | |
131 | } | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } | |
136 | \f | |
137 | /* Utilities for building expressions. | |
138 | Since complex expressions are recorded as symbols for use in other | |
139 | expressions these return a symbolS * and not an expressionS *. | |
140 | These explicitly do not take an "add_number" argument. */ | |
141 | /* ??? For completeness' sake one might want expr_build_symbol. | |
142 | It would just return its argument. */ | |
143 | ||
144 | /* Build an expression for an unsigned constant. | |
145 | The corresponding one for signed constants is missing because | |
146 | there's currently no need for it. One could add an unsigned_p flag | |
147 | but that seems more clumsy. */ | |
148 | ||
149 | symbolS * | |
dd625418 | 150 | expr_build_uconstant (offsetT value) |
252b5132 RH |
151 | { |
152 | expressionS e; | |
153 | ||
154 | e.X_op = O_constant; | |
155 | e.X_add_number = value; | |
156 | e.X_unsigned = 1; | |
157 | return make_expr_symbol (&e); | |
158 | } | |
159 | ||
252b5132 RH |
160 | /* Build an expression for the current location ('.'). */ |
161 | ||
162 | symbolS * | |
dd625418 | 163 | expr_build_dot (void) |
252b5132 RH |
164 | { |
165 | expressionS e; | |
166 | ||
167 | current_location (&e); | |
168 | return make_expr_symbol (&e); | |
169 | } | |
170 | \f | |
929b12bc KH |
171 | /* Build any floating-point literal here. |
172 | Also build any bignum literal here. */ | |
252b5132 RH |
173 | |
174 | /* Seems atof_machine can backscan through generic_bignum and hit whatever | |
175 | happens to be loaded before it in memory. And its way too complicated | |
176 | for me to fix right. Thus a hack. JF: Just make generic_bignum bigger, | |
177 | and never write into the early words, thus they'll always be zero. | |
178 | I hate Dean's floating-point code. Bleh. */ | |
179 | LITTLENUM_TYPE generic_bignum[SIZE_OF_LARGE_NUMBER + 6]; | |
e6c774b4 KH |
180 | |
181 | FLONUM_TYPE generic_floating_point_number = { | |
bc4466dc KH |
182 | &generic_bignum[6], /* low. (JF: Was 0) */ |
183 | &generic_bignum[SIZE_OF_LARGE_NUMBER + 6 - 1], /* high. JF: (added +6) */ | |
184 | 0, /* leader. */ | |
185 | 0, /* exponent. */ | |
186 | 0 /* sign. */ | |
252b5132 | 187 | }; |
929b12bc | 188 | |
252b5132 RH |
189 | \f |
190 | static void | |
dd625418 | 191 | floating_constant (expressionS *expressionP) |
252b5132 | 192 | { |
929b12bc | 193 | /* input_line_pointer -> floating-point constant. */ |
252b5132 RH |
194 | int error_code; |
195 | ||
196 | error_code = atof_generic (&input_line_pointer, ".", EXP_CHARS, | |
197 | &generic_floating_point_number); | |
198 | ||
199 | if (error_code) | |
200 | { | |
201 | if (error_code == ERROR_EXPONENT_OVERFLOW) | |
202 | { | |
0e389e77 | 203 | as_bad (_("bad floating-point constant: exponent overflow")); |
252b5132 RH |
204 | } |
205 | else | |
206 | { | |
0e389e77 AM |
207 | as_bad (_("bad floating-point constant: unknown error code=%d"), |
208 | error_code); | |
252b5132 RH |
209 | } |
210 | } | |
211 | expressionP->X_op = O_big; | |
929b12bc KH |
212 | /* input_line_pointer -> just after constant, which may point to |
213 | whitespace. */ | |
252b5132 RH |
214 | expressionP->X_add_number = -1; |
215 | } | |
216 | ||
929b12bc | 217 | static valueT |
dd625418 | 218 | generic_bignum_to_int32 (void) |
252b5132 RH |
219 | { |
220 | valueT number = | |
221 | ((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS) | |
222 | | (generic_bignum[0] & LITTLENUM_MASK); | |
223 | number &= 0xffffffff; | |
224 | return number; | |
225 | } | |
226 | ||
227 | #ifdef BFD64 | |
929b12bc | 228 | static valueT |
dd625418 | 229 | generic_bignum_to_int64 (void) |
252b5132 | 230 | { |
929b12bc KH |
231 | valueT number = |
232 | ((((((((valueT) generic_bignum[3] & LITTLENUM_MASK) | |
233 | << LITTLENUM_NUMBER_OF_BITS) | |
234 | | ((valueT) generic_bignum[2] & LITTLENUM_MASK)) | |
235 | << LITTLENUM_NUMBER_OF_BITS) | |
236 | | ((valueT) generic_bignum[1] & LITTLENUM_MASK)) | |
237 | << LITTLENUM_NUMBER_OF_BITS) | |
238 | | ((valueT) generic_bignum[0] & LITTLENUM_MASK)); | |
252b5132 RH |
239 | return number; |
240 | } | |
241 | #endif | |
242 | ||
243 | static void | |
dd625418 | 244 | integer_constant (int radix, expressionS *expressionP) |
252b5132 | 245 | { |
929b12bc | 246 | char *start; /* Start of number. */ |
252b5132 RH |
247 | char *suffix = NULL; |
248 | char c; | |
929b12bc KH |
249 | valueT number; /* Offset or (absolute) value. */ |
250 | short int digit; /* Value of next digit in current radix. */ | |
251 | short int maxdig = 0; /* Highest permitted digit value. */ | |
252 | int too_many_digits = 0; /* If we see >= this number of. */ | |
253 | char *name; /* Points to name of symbol. */ | |
254 | symbolS *symbolP; /* Points to symbol. */ | |
252b5132 | 255 | |
929b12bc | 256 | int small; /* True if fits in 32 bits. */ |
252b5132 | 257 | |
929b12bc | 258 | /* May be bignum, or may fit in 32 bits. */ |
252b5132 RH |
259 | /* Most numbers fit into 32 bits, and we want this case to be fast. |
260 | so we pretend it will fit into 32 bits. If, after making up a 32 | |
261 | bit number, we realise that we have scanned more digits than | |
262 | comfortably fit into 32 bits, we re-scan the digits coding them | |
263 | into a bignum. For decimal and octal numbers we are | |
264 | conservative: Some numbers may be assumed bignums when in fact | |
265 | they do fit into 32 bits. Numbers of any radix can have excess | |
266 | leading zeros: We strive to recognise this and cast them back | |
267 | into 32 bits. We must check that the bignum really is more than | |
268 | 32 bits, and change it back to a 32-bit number if it fits. The | |
269 | number we are looking for is expected to be positive, but if it | |
270 | fits into 32 bits as an unsigned number, we let it be a 32-bit | |
929b12bc | 271 | number. The cavalier approach is for speed in ordinary cases. */ |
252b5132 RH |
272 | /* This has been extended for 64 bits. We blindly assume that if |
273 | you're compiling in 64-bit mode, the target is a 64-bit machine. | |
274 | This should be cleaned up. */ | |
275 | ||
276 | #ifdef BFD64 | |
277 | #define valuesize 64 | |
278 | #else /* includes non-bfd case, mostly */ | |
279 | #define valuesize 32 | |
280 | #endif | |
281 | ||
f805106c | 282 | if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) && radix == 0) |
252b5132 RH |
283 | { |
284 | int flt = 0; | |
285 | ||
286 | /* In MRI mode, the number may have a suffix indicating the | |
02000999 AM |
287 | radix. For that matter, it might actually be a floating |
288 | point constant. */ | |
3882b010 | 289 | for (suffix = input_line_pointer; ISALNUM (*suffix); suffix++) |
252b5132 RH |
290 | { |
291 | if (*suffix == 'e' || *suffix == 'E') | |
292 | flt = 1; | |
293 | } | |
294 | ||
295 | if (suffix == input_line_pointer) | |
296 | { | |
297 | radix = 10; | |
298 | suffix = NULL; | |
299 | } | |
300 | else | |
301 | { | |
302 | c = *--suffix; | |
3882b010 | 303 | c = TOUPPER (c); |
252b5132 RH |
304 | if (c == 'B') |
305 | radix = 2; | |
306 | else if (c == 'D') | |
307 | radix = 10; | |
308 | else if (c == 'O' || c == 'Q') | |
309 | radix = 8; | |
310 | else if (c == 'H') | |
311 | radix = 16; | |
312 | else if (suffix[1] == '.' || c == 'E' || flt) | |
313 | { | |
314 | floating_constant (expressionP); | |
315 | return; | |
316 | } | |
317 | else | |
318 | { | |
319 | radix = 10; | |
320 | suffix = NULL; | |
321 | } | |
322 | } | |
323 | } | |
324 | ||
325 | switch (radix) | |
326 | { | |
327 | case 2: | |
328 | maxdig = 2; | |
329 | too_many_digits = valuesize + 1; | |
330 | break; | |
331 | case 8: | |
332 | maxdig = radix = 8; | |
333 | too_many_digits = (valuesize + 2) / 3 + 1; | |
334 | break; | |
335 | case 16: | |
336 | maxdig = radix = 16; | |
337 | too_many_digits = (valuesize + 3) / 4 + 1; | |
338 | break; | |
339 | case 10: | |
340 | maxdig = radix = 10; | |
929b12bc | 341 | too_many_digits = (valuesize + 11) / 4; /* Very rough. */ |
252b5132 RH |
342 | } |
343 | #undef valuesize | |
344 | start = input_line_pointer; | |
345 | c = *input_line_pointer++; | |
346 | for (number = 0; | |
347 | (digit = hex_value (c)) < maxdig; | |
348 | c = *input_line_pointer++) | |
349 | { | |
350 | number = number * radix + digit; | |
351 | } | |
929b12bc KH |
352 | /* c contains character after number. */ |
353 | /* input_line_pointer->char after c. */ | |
252b5132 RH |
354 | small = (input_line_pointer - start - 1) < too_many_digits; |
355 | ||
929b12bc | 356 | if (radix == 16 && c == '_') |
252b5132 RH |
357 | { |
358 | /* This is literal of the form 0x333_0_12345678_1. | |
02000999 | 359 | This example is equivalent to 0x00000333000000001234567800000001. */ |
252b5132 RH |
360 | |
361 | int num_little_digits = 0; | |
362 | int i; | |
929b12bc | 363 | input_line_pointer = start; /* -> 1st digit. */ |
252b5132 RH |
364 | |
365 | know (LITTLENUM_NUMBER_OF_BITS == 16); | |
366 | ||
929b12bc | 367 | for (c = '_'; c == '_'; num_little_digits += 2) |
252b5132 RH |
368 | { |
369 | ||
929b12bc KH |
370 | /* Convert one 64-bit word. */ |
371 | int ndigit = 0; | |
252b5132 RH |
372 | number = 0; |
373 | for (c = *input_line_pointer++; | |
374 | (digit = hex_value (c)) < maxdig; | |
375 | c = *(input_line_pointer++)) | |
376 | { | |
377 | number = number * radix + digit; | |
378 | ndigit++; | |
379 | } | |
380 | ||
381 | /* Check for 8 digit per word max. */ | |
929b12bc | 382 | if (ndigit > 8) |
0e389e77 | 383 | as_bad (_("a bignum with underscores may not have more than 8 hex digits in any word")); |
252b5132 | 384 | |
929b12bc KH |
385 | /* Add this chunk to the bignum. |
386 | Shift things down 2 little digits. */ | |
252b5132 | 387 | know (LITTLENUM_NUMBER_OF_BITS == 16); |
929b12bc KH |
388 | for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1); |
389 | i >= 2; | |
390 | i--) | |
391 | generic_bignum[i] = generic_bignum[i - 2]; | |
252b5132 | 392 | |
929b12bc | 393 | /* Add the new digits as the least significant new ones. */ |
252b5132 RH |
394 | generic_bignum[0] = number & 0xffffffff; |
395 | generic_bignum[1] = number >> 16; | |
396 | } | |
397 | ||
929b12bc | 398 | /* Again, c is char after number, input_line_pointer->after c. */ |
252b5132 RH |
399 | |
400 | if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1) | |
401 | num_little_digits = SIZE_OF_LARGE_NUMBER - 1; | |
402 | ||
403 | assert (num_little_digits >= 4); | |
404 | ||
405 | if (num_little_digits != 8) | |
0e389e77 | 406 | as_bad (_("a bignum with underscores must have exactly 4 words")); |
252b5132 RH |
407 | |
408 | /* We might have some leading zeros. These can be trimmed to give | |
929b12bc KH |
409 | us a change to fit this constant into a small number. */ |
410 | while (generic_bignum[num_little_digits - 1] == 0 | |
411 | && num_little_digits > 1) | |
252b5132 | 412 | num_little_digits--; |
929b12bc | 413 | |
252b5132 RH |
414 | if (num_little_digits <= 2) |
415 | { | |
929b12bc | 416 | /* will fit into 32 bits. */ |
252b5132 RH |
417 | number = generic_bignum_to_int32 (); |
418 | small = 1; | |
419 | } | |
420 | #ifdef BFD64 | |
421 | else if (num_little_digits <= 4) | |
422 | { | |
423 | /* Will fit into 64 bits. */ | |
424 | number = generic_bignum_to_int64 (); | |
425 | small = 1; | |
426 | } | |
427 | #endif | |
428 | else | |
429 | { | |
430 | small = 0; | |
929b12bc KH |
431 | |
432 | /* Number of littlenums in the bignum. */ | |
433 | number = num_little_digits; | |
252b5132 RH |
434 | } |
435 | } | |
436 | else if (!small) | |
437 | { | |
929b12bc KH |
438 | /* We saw a lot of digits. manufacture a bignum the hard way. */ |
439 | LITTLENUM_TYPE *leader; /* -> high order littlenum of the bignum. */ | |
440 | LITTLENUM_TYPE *pointer; /* -> littlenum we are frobbing now. */ | |
252b5132 RH |
441 | long carry; |
442 | ||
443 | leader = generic_bignum; | |
444 | generic_bignum[0] = 0; | |
445 | generic_bignum[1] = 0; | |
446 | generic_bignum[2] = 0; | |
447 | generic_bignum[3] = 0; | |
929b12bc | 448 | input_line_pointer = start; /* -> 1st digit. */ |
252b5132 | 449 | c = *input_line_pointer++; |
929b12bc | 450 | for (; (carry = hex_value (c)) < maxdig; c = *input_line_pointer++) |
252b5132 | 451 | { |
929b12bc | 452 | for (pointer = generic_bignum; pointer <= leader; pointer++) |
252b5132 RH |
453 | { |
454 | long work; | |
455 | ||
456 | work = carry + radix * *pointer; | |
457 | *pointer = work & LITTLENUM_MASK; | |
458 | carry = work >> LITTLENUM_NUMBER_OF_BITS; | |
459 | } | |
460 | if (carry) | |
461 | { | |
462 | if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 1) | |
463 | { | |
929b12bc | 464 | /* Room to grow a longer bignum. */ |
252b5132 RH |
465 | *++leader = carry; |
466 | } | |
467 | } | |
468 | } | |
929b12bc KH |
469 | /* Again, c is char after number. */ |
470 | /* input_line_pointer -> after c. */ | |
252b5132 RH |
471 | know (LITTLENUM_NUMBER_OF_BITS == 16); |
472 | if (leader < generic_bignum + 2) | |
473 | { | |
929b12bc | 474 | /* Will fit into 32 bits. */ |
252b5132 RH |
475 | number = generic_bignum_to_int32 (); |
476 | small = 1; | |
477 | } | |
478 | #ifdef BFD64 | |
479 | else if (leader < generic_bignum + 4) | |
480 | { | |
481 | /* Will fit into 64 bits. */ | |
482 | number = generic_bignum_to_int64 (); | |
483 | small = 1; | |
484 | } | |
485 | #endif | |
486 | else | |
487 | { | |
929b12bc KH |
488 | /* Number of littlenums in the bignum. */ |
489 | number = leader - generic_bignum + 1; | |
252b5132 RH |
490 | } |
491 | } | |
492 | ||
60bcf0fa NC |
493 | if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
494 | && suffix != NULL | |
f805106c | 495 | && input_line_pointer - 1 == suffix) |
252b5132 RH |
496 | c = *input_line_pointer++; |
497 | ||
498 | if (small) | |
499 | { | |
929b12bc KH |
500 | /* Here with number, in correct radix. c is the next char. |
501 | Note that unlike un*x, we allow "011f" "0x9f" to both mean | |
502 | the same as the (conventional) "9f". | |
503 | This is simply easier than checking for strict canonical | |
504 | form. Syntax sux! */ | |
252b5132 RH |
505 | |
506 | if (LOCAL_LABELS_FB && c == 'b') | |
507 | { | |
929b12bc KH |
508 | /* Backward ref to local label. |
509 | Because it is backward, expect it to be defined. */ | |
252b5132 RH |
510 | /* Construct a local label. */ |
511 | name = fb_label_name ((int) number, 0); | |
512 | ||
929b12bc | 513 | /* Seen before, or symbol is defined: OK. */ |
252b5132 RH |
514 | symbolP = symbol_find (name); |
515 | if ((symbolP != NULL) && (S_IS_DEFINED (symbolP))) | |
516 | { | |
929b12bc KH |
517 | /* Local labels are never absolute. Don't waste time |
518 | checking absoluteness. */ | |
252b5132 RH |
519 | know (SEG_NORMAL (S_GET_SEGMENT (symbolP))); |
520 | ||
521 | expressionP->X_op = O_symbol; | |
522 | expressionP->X_add_symbol = symbolP; | |
523 | } | |
524 | else | |
525 | { | |
929b12bc | 526 | /* Either not seen or not defined. */ |
252b5132 RH |
527 | /* @@ Should print out the original string instead of |
528 | the parsed number. */ | |
0e389e77 | 529 | as_bad (_("backward ref to unknown label \"%d:\""), |
252b5132 RH |
530 | (int) number); |
531 | expressionP->X_op = O_constant; | |
532 | } | |
533 | ||
534 | expressionP->X_add_number = 0; | |
535 | } /* case 'b' */ | |
536 | else if (LOCAL_LABELS_FB && c == 'f') | |
537 | { | |
929b12bc KH |
538 | /* Forward reference. Expect symbol to be undefined or |
539 | unknown. undefined: seen it before. unknown: never seen | |
540 | it before. | |
541 | ||
542 | Construct a local label name, then an undefined symbol. | |
543 | Don't create a xseg frag for it: caller may do that. | |
544 | Just return it as never seen before. */ | |
252b5132 RH |
545 | name = fb_label_name ((int) number, 1); |
546 | symbolP = symbol_find_or_make (name); | |
929b12bc | 547 | /* We have no need to check symbol properties. */ |
252b5132 | 548 | #ifndef many_segments |
929b12bc | 549 | /* Since "know" puts its arg into a "string", we |
252b5132 RH |
550 | can't have newlines in the argument. */ |
551 | know (S_GET_SEGMENT (symbolP) == undefined_section || S_GET_SEGMENT (symbolP) == text_section || S_GET_SEGMENT (symbolP) == data_section); | |
552 | #endif | |
553 | expressionP->X_op = O_symbol; | |
554 | expressionP->X_add_symbol = symbolP; | |
555 | expressionP->X_add_number = 0; | |
556 | } /* case 'f' */ | |
557 | else if (LOCAL_LABELS_DOLLAR && c == '$') | |
558 | { | |
559 | /* If the dollar label is *currently* defined, then this is just | |
560 | another reference to it. If it is not *currently* defined, | |
561 | then this is a fresh instantiation of that number, so create | |
562 | it. */ | |
563 | ||
564 | if (dollar_label_defined ((long) number)) | |
565 | { | |
566 | name = dollar_label_name ((long) number, 0); | |
567 | symbolP = symbol_find (name); | |
568 | know (symbolP != NULL); | |
569 | } | |
570 | else | |
571 | { | |
572 | name = dollar_label_name ((long) number, 1); | |
573 | symbolP = symbol_find_or_make (name); | |
574 | } | |
575 | ||
576 | expressionP->X_op = O_symbol; | |
577 | expressionP->X_add_symbol = symbolP; | |
578 | expressionP->X_add_number = 0; | |
579 | } /* case '$' */ | |
580 | else | |
581 | { | |
582 | expressionP->X_op = O_constant; | |
252b5132 | 583 | expressionP->X_add_number = number; |
bc4466dc | 584 | input_line_pointer--; /* Restore following character. */ |
929b12bc | 585 | } /* Really just a number. */ |
252b5132 RH |
586 | } |
587 | else | |
588 | { | |
bc4466dc | 589 | /* Not a small number. */ |
252b5132 | 590 | expressionP->X_op = O_big; |
929b12bc KH |
591 | expressionP->X_add_number = number; /* Number of littlenums. */ |
592 | input_line_pointer--; /* -> char following number. */ | |
252b5132 RH |
593 | } |
594 | } | |
595 | ||
596 | /* Parse an MRI multi character constant. */ | |
597 | ||
598 | static void | |
dd625418 | 599 | mri_char_constant (expressionS *expressionP) |
252b5132 RH |
600 | { |
601 | int i; | |
602 | ||
603 | if (*input_line_pointer == '\'' | |
604 | && input_line_pointer[1] != '\'') | |
605 | { | |
606 | expressionP->X_op = O_constant; | |
607 | expressionP->X_add_number = 0; | |
608 | return; | |
609 | } | |
610 | ||
611 | /* In order to get the correct byte ordering, we must build the | |
612 | number in reverse. */ | |
613 | for (i = SIZE_OF_LARGE_NUMBER - 1; i >= 0; i--) | |
614 | { | |
615 | int j; | |
616 | ||
617 | generic_bignum[i] = 0; | |
618 | for (j = 0; j < CHARS_PER_LITTLENUM; j++) | |
619 | { | |
620 | if (*input_line_pointer == '\'') | |
621 | { | |
622 | if (input_line_pointer[1] != '\'') | |
623 | break; | |
624 | ++input_line_pointer; | |
625 | } | |
626 | generic_bignum[i] <<= 8; | |
627 | generic_bignum[i] += *input_line_pointer; | |
628 | ++input_line_pointer; | |
629 | } | |
630 | ||
631 | if (i < SIZE_OF_LARGE_NUMBER - 1) | |
632 | { | |
633 | /* If there is more than one littlenum, left justify the | |
02000999 AM |
634 | last one to make it match the earlier ones. If there is |
635 | only one, we can just use the value directly. */ | |
252b5132 RH |
636 | for (; j < CHARS_PER_LITTLENUM; j++) |
637 | generic_bignum[i] <<= 8; | |
638 | } | |
639 | ||
640 | if (*input_line_pointer == '\'' | |
641 | && input_line_pointer[1] != '\'') | |
642 | break; | |
643 | } | |
644 | ||
645 | if (i < 0) | |
646 | { | |
0e389e77 | 647 | as_bad (_("character constant too large")); |
252b5132 RH |
648 | i = 0; |
649 | } | |
650 | ||
651 | if (i > 0) | |
652 | { | |
653 | int c; | |
654 | int j; | |
655 | ||
656 | c = SIZE_OF_LARGE_NUMBER - i; | |
657 | for (j = 0; j < c; j++) | |
658 | generic_bignum[j] = generic_bignum[i + j]; | |
659 | i = c; | |
660 | } | |
661 | ||
662 | know (LITTLENUM_NUMBER_OF_BITS == 16); | |
663 | if (i > 2) | |
664 | { | |
665 | expressionP->X_op = O_big; | |
666 | expressionP->X_add_number = i; | |
667 | } | |
668 | else | |
669 | { | |
670 | expressionP->X_op = O_constant; | |
671 | if (i < 2) | |
672 | expressionP->X_add_number = generic_bignum[0] & LITTLENUM_MASK; | |
673 | else | |
674 | expressionP->X_add_number = | |
675 | (((generic_bignum[1] & LITTLENUM_MASK) | |
676 | << LITTLENUM_NUMBER_OF_BITS) | |
677 | | (generic_bignum[0] & LITTLENUM_MASK)); | |
678 | } | |
679 | ||
680 | /* Skip the final closing quote. */ | |
681 | ++input_line_pointer; | |
682 | } | |
683 | ||
684 | /* Return an expression representing the current location. This | |
685 | handles the magic symbol `.'. */ | |
686 | ||
687 | static void | |
dd625418 | 688 | current_location (expressionS *expressionp) |
252b5132 RH |
689 | { |
690 | if (now_seg == absolute_section) | |
691 | { | |
692 | expressionp->X_op = O_constant; | |
693 | expressionp->X_add_number = abs_section_offset; | |
694 | } | |
695 | else | |
696 | { | |
252b5132 | 697 | expressionp->X_op = O_symbol; |
756d1d01 | 698 | expressionp->X_add_symbol = symbol_temp_new_now (); |
252b5132 RH |
699 | expressionp->X_add_number = 0; |
700 | } | |
701 | } | |
702 | ||
929b12bc KH |
703 | /* In: Input_line_pointer points to 1st char of operand, which may |
704 | be a space. | |
705 | ||
3b37fd66 | 706 | Out: An expressionS. |
929b12bc KH |
707 | The operand may have been empty: in this case X_op == O_absent. |
708 | Input_line_pointer->(next non-blank) char after operand. */ | |
252b5132 RH |
709 | |
710 | static segT | |
dd625418 | 711 | operand (expressionS *expressionP) |
252b5132 RH |
712 | { |
713 | char c; | |
929b12bc KH |
714 | symbolS *symbolP; /* Points to symbol. */ |
715 | char *name; /* Points to name of symbol. */ | |
252b5132 RH |
716 | segT segment; |
717 | ||
718 | /* All integers are regarded as unsigned unless they are negated. | |
719 | This is because the only thing which cares whether a number is | |
720 | unsigned is the code in emit_expr which extends constants into | |
721 | bignums. It should only sign extend negative numbers, so that | |
722 | something like ``.quad 0x80000000'' is not sign extended even | |
723 | though it appears negative if valueT is 32 bits. */ | |
724 | expressionP->X_unsigned = 1; | |
725 | ||
929b12bc | 726 | /* Digits, assume it is a bignum. */ |
252b5132 | 727 | |
929b12bc | 728 | SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */ |
bc4466dc | 729 | c = *input_line_pointer++; /* input_line_pointer -> past char in c. */ |
252b5132 | 730 | |
b75c0c92 AM |
731 | if (is_end_of_line[(unsigned char) c]) |
732 | goto eol; | |
733 | ||
252b5132 RH |
734 | switch (c) |
735 | { | |
736 | case '1': | |
737 | case '2': | |
738 | case '3': | |
739 | case '4': | |
740 | case '5': | |
741 | case '6': | |
742 | case '7': | |
743 | case '8': | |
744 | case '9': | |
745 | input_line_pointer--; | |
746 | ||
60bcf0fa | 747 | integer_constant ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
929b12bc | 748 | ? 0 : 10, |
411863a4 | 749 | expressionP); |
252b5132 RH |
750 | break; |
751 | ||
ed6d6fd3 FCE |
752 | #ifdef LITERAL_PREFIXDOLLAR_HEX |
753 | case '$': | |
c68012fb JJ |
754 | /* $L is the start of a local label, not a hex constant. */ |
755 | if (* input_line_pointer == 'L') | |
756 | goto isname; | |
ed6d6fd3 FCE |
757 | integer_constant (16, expressionP); |
758 | break; | |
759 | #endif | |
760 | ||
977e771a FCE |
761 | #ifdef LITERAL_PREFIXPERCENT_BIN |
762 | case '%': | |
763 | integer_constant (2, expressionP); | |
764 | break; | |
765 | #endif | |
766 | ||
252b5132 | 767 | case '0': |
929b12bc | 768 | /* Non-decimal radix. */ |
252b5132 | 769 | |
f805106c | 770 | if (NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
252b5132 RH |
771 | { |
772 | char *s; | |
773 | ||
02000999 | 774 | /* Check for a hex or float constant. */ |
252b5132 RH |
775 | for (s = input_line_pointer; hex_p (*s); s++) |
776 | ; | |
02000999 | 777 | if (*s == 'h' || *s == 'H' || *input_line_pointer == '.') |
252b5132 RH |
778 | { |
779 | --input_line_pointer; | |
780 | integer_constant (0, expressionP); | |
781 | break; | |
782 | } | |
929b12bc | 783 | } |
252b5132 RH |
784 | c = *input_line_pointer; |
785 | switch (c) | |
786 | { | |
787 | case 'o': | |
788 | case 'O': | |
789 | case 'q': | |
790 | case 'Q': | |
791 | case '8': | |
792 | case '9': | |
f805106c | 793 | if (NUMBERS_WITH_SUFFIX || flag_m68k_mri) |
252b5132 RH |
794 | { |
795 | integer_constant (0, expressionP); | |
796 | break; | |
797 | } | |
798 | /* Fall through. */ | |
799 | default: | |
800 | default_case: | |
801 | if (c && strchr (FLT_CHARS, c)) | |
802 | { | |
803 | input_line_pointer++; | |
804 | floating_constant (expressionP); | |
3882b010 | 805 | expressionP->X_add_number = - TOLOWER (c); |
252b5132 RH |
806 | } |
807 | else | |
808 | { | |
929b12bc | 809 | /* The string was only zero. */ |
252b5132 RH |
810 | expressionP->X_op = O_constant; |
811 | expressionP->X_add_number = 0; | |
812 | } | |
813 | ||
814 | break; | |
815 | ||
816 | case 'x': | |
817 | case 'X': | |
ab266a97 | 818 | if (flag_m68k_mri) |
252b5132 RH |
819 | goto default_case; |
820 | input_line_pointer++; | |
821 | integer_constant (16, expressionP); | |
822 | break; | |
823 | ||
824 | case 'b': | |
6dc19fc4 | 825 | if (LOCAL_LABELS_FB && ! (flag_m68k_mri || NUMBERS_WITH_SUFFIX)) |
252b5132 RH |
826 | { |
827 | /* This code used to check for '+' and '-' here, and, in | |
828 | some conditions, fall through to call | |
829 | integer_constant. However, that didn't make sense, | |
830 | as integer_constant only accepts digits. */ | |
831 | /* Some of our code elsewhere does permit digits greater | |
832 | than the expected base; for consistency, do the same | |
833 | here. */ | |
834 | if (input_line_pointer[1] < '0' | |
835 | || input_line_pointer[1] > '9') | |
836 | { | |
837 | /* Parse this as a back reference to label 0. */ | |
838 | input_line_pointer--; | |
839 | integer_constant (10, expressionP); | |
840 | break; | |
841 | } | |
842 | /* Otherwise, parse this as a binary number. */ | |
843 | } | |
844 | /* Fall through. */ | |
845 | case 'B': | |
846 | input_line_pointer++; | |
6dc19fc4 | 847 | if (flag_m68k_mri || NUMBERS_WITH_SUFFIX) |
252b5132 RH |
848 | goto default_case; |
849 | integer_constant (2, expressionP); | |
850 | break; | |
851 | ||
852 | case '0': | |
853 | case '1': | |
854 | case '2': | |
855 | case '3': | |
856 | case '4': | |
857 | case '5': | |
858 | case '6': | |
859 | case '7': | |
6dc19fc4 | 860 | integer_constant ((flag_m68k_mri || NUMBERS_WITH_SUFFIX) |
929b12bc KH |
861 | ? 0 : 8, |
862 | expressionP); | |
252b5132 RH |
863 | break; |
864 | ||
865 | case 'f': | |
866 | if (LOCAL_LABELS_FB) | |
867 | { | |
868 | /* If it says "0f" and it could possibly be a floating point | |
869 | number, make it one. Otherwise, make it a local label, | |
870 | and try to deal with parsing the rest later. */ | |
871 | if (!input_line_pointer[1] | |
271bb601 HPN |
872 | || (is_end_of_line[0xff & input_line_pointer[1]]) |
873 | || strchr (FLT_CHARS, 'f') == NULL) | |
252b5132 RH |
874 | goto is_0f_label; |
875 | { | |
876 | char *cp = input_line_pointer + 1; | |
877 | int r = atof_generic (&cp, ".", EXP_CHARS, | |
878 | &generic_floating_point_number); | |
879 | switch (r) | |
880 | { | |
881 | case 0: | |
882 | case ERROR_EXPONENT_OVERFLOW: | |
883 | if (*cp == 'f' || *cp == 'b') | |
929b12bc | 884 | /* Looks like a difference expression. */ |
252b5132 RH |
885 | goto is_0f_label; |
886 | else if (cp == input_line_pointer + 1) | |
887 | /* No characters has been accepted -- looks like | |
929b12bc | 888 | end of operand. */ |
252b5132 RH |
889 | goto is_0f_label; |
890 | else | |
891 | goto is_0f_float; | |
892 | default: | |
893 | as_fatal (_("expr.c(operand): bad atof_generic return val %d"), | |
894 | r); | |
895 | } | |
896 | } | |
897 | ||
898 | /* Okay, now we've sorted it out. We resume at one of these | |
899 | two labels, depending on what we've decided we're probably | |
900 | looking at. */ | |
901 | is_0f_label: | |
902 | input_line_pointer--; | |
903 | integer_constant (10, expressionP); | |
904 | break; | |
905 | ||
906 | is_0f_float: | |
929b12bc | 907 | /* Fall through. */ |
252b5132 RH |
908 | ; |
909 | } | |
910 | ||
911 | case 'd': | |
912 | case 'D': | |
6dc19fc4 | 913 | if (flag_m68k_mri || NUMBERS_WITH_SUFFIX) |
252b5132 RH |
914 | { |
915 | integer_constant (0, expressionP); | |
916 | break; | |
917 | } | |
918 | /* Fall through. */ | |
919 | case 'F': | |
920 | case 'r': | |
921 | case 'e': | |
922 | case 'E': | |
923 | case 'g': | |
924 | case 'G': | |
925 | input_line_pointer++; | |
926 | floating_constant (expressionP); | |
3882b010 | 927 | expressionP->X_add_number = - TOLOWER (c); |
252b5132 RH |
928 | break; |
929 | ||
930 | case '$': | |
931 | if (LOCAL_LABELS_DOLLAR) | |
932 | { | |
933 | integer_constant (10, expressionP); | |
934 | break; | |
935 | } | |
936 | else | |
937 | goto default_case; | |
938 | } | |
939 | ||
940 | break; | |
941 | ||
942 | case '(': | |
b585bc2c | 943 | #ifndef NEED_INDEX_OPERATOR |
252b5132 | 944 | case '[': |
b585bc2c | 945 | #endif |
929b12bc | 946 | /* Didn't begin with digit & not a name. */ |
252b5132 | 947 | segment = expression (expressionP); |
929b12bc | 948 | /* expression () will pass trailing whitespace. */ |
f7c88872 AM |
949 | if ((c == '(' && *input_line_pointer != ')') |
950 | || (c == '[' && *input_line_pointer != ']')) | |
fbacee5b | 951 | as_bad (_("missing '%c'"), c == '(' ? ')' : ']'); |
f7c88872 | 952 | else |
929b12bc | 953 | input_line_pointer++; |
252b5132 | 954 | SKIP_WHITESPACE (); |
929b12bc | 955 | /* Here with input_line_pointer -> char after "(...)". */ |
252b5132 RH |
956 | return segment; |
957 | ||
abd63a32 | 958 | #ifdef TC_M68K |
252b5132 RH |
959 | case 'E': |
960 | if (! flag_m68k_mri || *input_line_pointer != '\'') | |
961 | goto de_fault; | |
962 | as_bad (_("EBCDIC constants are not supported")); | |
963 | /* Fall through. */ | |
964 | case 'A': | |
965 | if (! flag_m68k_mri || *input_line_pointer != '\'') | |
966 | goto de_fault; | |
967 | ++input_line_pointer; | |
968 | /* Fall through. */ | |
abd63a32 | 969 | #endif |
252b5132 RH |
970 | case '\'': |
971 | if (! flag_m68k_mri) | |
972 | { | |
973 | /* Warning: to conform to other people's assemblers NO | |
929b12bc | 974 | ESCAPEMENT is permitted for a single quote. The next |
252b5132 | 975 | character, parity errors and all, is taken as the value |
929b12bc | 976 | of the operand. VERY KINKY. */ |
252b5132 RH |
977 | expressionP->X_op = O_constant; |
978 | expressionP->X_add_number = *input_line_pointer++; | |
979 | break; | |
980 | } | |
981 | ||
982 | mri_char_constant (expressionP); | |
983 | break; | |
984 | ||
abd63a32 | 985 | #ifdef TC_M68K |
252b5132 RH |
986 | case '"': |
987 | /* Double quote is the bitwise not operator in MRI mode. */ | |
988 | if (! flag_m68k_mri) | |
989 | goto de_fault; | |
990 | /* Fall through. */ | |
abd63a32 | 991 | #endif |
252b5132 | 992 | case '~': |
929b12bc | 993 | /* '~' is permitted to start a label on the Delta. */ |
252b5132 RH |
994 | if (is_name_beginner (c)) |
995 | goto isname; | |
996 | case '!': | |
997 | case '-': | |
43c3ab55 | 998 | case '+': |
252b5132 | 999 | { |
43c3ab55 | 1000 | /* Do not accept ++e or --e as +(+e) or -(-e) |
1181c20e | 1001 | Disabled, since the preprocessor removes whitespace. */ |
43c3ab55 | 1002 | if (0 && (c == '-' || c == '+') && *input_line_pointer == c) |
3e4caed2 NS |
1003 | goto target_op; |
1004 | ||
252b5132 RH |
1005 | operand (expressionP); |
1006 | if (expressionP->X_op == O_constant) | |
1007 | { | |
929b12bc | 1008 | /* input_line_pointer -> char after operand. */ |
252b5132 RH |
1009 | if (c == '-') |
1010 | { | |
958b5f01 | 1011 | expressionP->X_add_number = - expressionP->X_add_number; |
929b12bc KH |
1012 | /* Notice: '-' may overflow: no warning is given. |
1013 | This is compatible with other people's | |
1014 | assemblers. Sigh. */ | |
252b5132 RH |
1015 | expressionP->X_unsigned = 0; |
1016 | } | |
1017 | else if (c == '~' || c == '"') | |
1018 | expressionP->X_add_number = ~ expressionP->X_add_number; | |
43c3ab55 | 1019 | else if (c == '!') |
252b5132 RH |
1020 | expressionP->X_add_number = ! expressionP->X_add_number; |
1021 | } | |
02000999 AM |
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 | } | |
b2221023 MM |
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 | } | |
252b5132 RH |
1063 | else if (expressionP->X_op != O_illegal |
1064 | && expressionP->X_op != O_absent) | |
1065 | { | |
43c3ab55 JB |
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 | } | |
252b5132 RH |
1077 | } |
1078 | else | |
1079 | as_warn (_("Unary operator %c ignored because bad operand follows"), | |
1080 | c); | |
1081 | } | |
1082 | break; | |
1083 | ||
abd63a32 | 1084 | #if defined (DOLLAR_DOT) || defined (TC_M68K) |
252b5132 | 1085 | case '$': |
929b12bc | 1086 | /* '$' is the program counter when in MRI mode, or when |
02000999 | 1087 | DOLLAR_DOT is defined. */ |
252b5132 RH |
1088 | #ifndef DOLLAR_DOT |
1089 | if (! flag_m68k_mri) | |
1090 | goto de_fault; | |
1091 | #endif | |
1092 | if (flag_m68k_mri && hex_p (*input_line_pointer)) | |
1093 | { | |
929b12bc | 1094 | /* In MRI mode, '$' is also used as the prefix for a |
02000999 | 1095 | hexadecimal constant. */ |
252b5132 RH |
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; | |
abd63a32 | 1105 | #endif |
252b5132 RH |
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 | } | |
b75c0c92 | 1160 | |
252b5132 | 1161 | case ',': |
252b5132 | 1162 | eol: |
929b12bc | 1163 | /* Can't imagine any other kind of operand. */ |
252b5132 RH |
1164 | expressionP->X_op = O_absent; |
1165 | input_line_pointer--; | |
1166 | break; | |
1167 | ||
abd63a32 | 1168 | #ifdef TC_M68K |
252b5132 RH |
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 | |
02000999 | 1186 | using hexadecimal digits. */ |
252b5132 RH |
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; | |
abd63a32 | 1198 | #endif |
252b5132 RH |
1199 | |
1200 | default: | |
abd63a32 | 1201 | #ifdef TC_M68K |
252b5132 | 1202 | de_fault: |
abd63a32 | 1203 | #endif |
929b12bc | 1204 | if (is_name_beginner (c)) /* Here if did not begin with a digit. */ |
252b5132 | 1205 | { |
929b12bc KH |
1206 | /* Identifier begins here. |
1207 | This is kludged for speed, so code is repeated. */ | |
252b5132 RH |
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 | |
02000999 AM |
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. */ | |
a8a22e33 | 1217 | if (md_parse_name (name, expressionP, &c)) |
252b5132 RH |
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; | |
929b12bc | 1260 | } |
252b5132 RH |
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 (segment == absolute_section) | |
1269 | { | |
1270 | expressionP->X_op = O_constant; | |
1271 | expressionP->X_add_number = S_GET_VALUE (symbolP); | |
1272 | } | |
1273 | else if (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 | { | |
3e4caed2 | 1288 | target_op: |
252b5132 RH |
1289 | /* Let the target try to parse it. Success is indicated by changing |
1290 | the X_op field to something other than O_absent and pointing | |
927781e2 | 1291 | input_line_pointer past the expression. If it can't parse the |
252b5132 RH |
1292 | expression, X_op and input_line_pointer should be unchanged. */ |
1293 | expressionP->X_op = O_absent; | |
1294 | --input_line_pointer; | |
1295 | md_operand (expressionP); | |
1296 | if (expressionP->X_op == O_absent) | |
1297 | { | |
1298 | ++input_line_pointer; | |
0e389e77 | 1299 | as_bad (_("bad expression")); |
252b5132 RH |
1300 | expressionP->X_op = O_constant; |
1301 | expressionP->X_add_number = 0; | |
1302 | } | |
1303 | } | |
1304 | break; | |
1305 | } | |
1306 | ||
929b12bc KH |
1307 | /* It is more 'efficient' to clean up the expressionS when they are |
1308 | created. Doing it here saves lines of code. */ | |
252b5132 | 1309 | clean_up_expression (expressionP); |
929b12bc | 1310 | SKIP_WHITESPACE (); /* -> 1st char after operand. */ |
252b5132 RH |
1311 | know (*input_line_pointer != ' '); |
1312 | ||
1313 | /* The PA port needs this information. */ | |
1314 | if (expressionP->X_add_symbol) | |
49309057 | 1315 | symbol_mark_used (expressionP->X_add_symbol); |
252b5132 RH |
1316 | |
1317 | switch (expressionP->X_op) | |
1318 | { | |
1319 | default: | |
1320 | return absolute_section; | |
1321 | case O_symbol: | |
1322 | return S_GET_SEGMENT (expressionP->X_add_symbol); | |
1323 | case O_register: | |
1324 | return reg_section; | |
1325 | } | |
929b12bc | 1326 | } |
252b5132 | 1327 | \f |
929b12bc KH |
1328 | /* Internal. Simplify a struct expression for use by expr (). */ |
1329 | ||
3b37fd66 | 1330 | /* In: address of an expressionS. |
929b12bc KH |
1331 | The X_op field of the expressionS may only take certain values. |
1332 | Elsewise we waste time special-case testing. Sigh. Ditto SEG_ABSENT. | |
1333 | ||
1334 | Out: expressionS may have been modified: | |
929b12bc | 1335 | Unused fields zeroed to help expr (). */ |
252b5132 RH |
1336 | |
1337 | static void | |
dd625418 | 1338 | clean_up_expression (expressionS *expressionP) |
252b5132 RH |
1339 | { |
1340 | switch (expressionP->X_op) | |
1341 | { | |
1342 | case O_illegal: | |
1343 | case O_absent: | |
1344 | expressionP->X_add_number = 0; | |
1345 | /* Fall through. */ | |
1346 | case O_big: | |
1347 | case O_constant: | |
1348 | case O_register: | |
1349 | expressionP->X_add_symbol = NULL; | |
1350 | /* Fall through. */ | |
1351 | case O_symbol: | |
1352 | case O_uminus: | |
1353 | case O_bit_not: | |
1354 | expressionP->X_op_symbol = NULL; | |
1355 | break; | |
252b5132 RH |
1356 | default: |
1357 | break; | |
1358 | } | |
1359 | } | |
1360 | \f | |
929b12bc KH |
1361 | /* Expression parser. */ |
1362 | ||
1363 | /* We allow an empty expression, and just assume (absolute,0) silently. | |
1364 | Unary operators and parenthetical expressions are treated as operands. | |
1365 | As usual, Q==quantity==operand, O==operator, X==expression mnemonics. | |
1366 | ||
3b37fd66 | 1367 | We used to do an aho/ullman shift-reduce parser, but the logic got so |
929b12bc KH |
1368 | warped that I flushed it and wrote a recursive-descent parser instead. |
1369 | Now things are stable, would anybody like to write a fast parser? | |
1370 | Most expressions are either register (which does not even reach here) | |
1371 | or 1 symbol. Then "symbol+constant" and "symbol-symbol" are common. | |
1372 | So I guess it doesn't really matter how inefficient more complex expressions | |
1373 | are parsed. | |
1374 | ||
1375 | After expr(RANK,resultP) input_line_pointer->operator of rank <= RANK. | |
1376 | Also, we have consumed any leading or trailing spaces (operand does that) | |
1377 | and done all intervening operators. | |
1378 | ||
1379 | This returns the segment of the result, which will be | |
1380 | absolute_section or the segment of a symbol. */ | |
252b5132 RH |
1381 | |
1382 | #undef __ | |
1383 | #define __ O_illegal | |
1384 | ||
b041f888 KH |
1385 | /* Maps ASCII -> operators. */ |
1386 | static const operatorT op_encoding[256] = { | |
252b5132 RH |
1387 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, |
1388 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1389 | ||
1390 | __, O_bit_or_not, __, __, __, O_modulus, O_bit_and, __, | |
1391 | __, __, O_multiply, O_add, __, O_subtract, __, O_divide, | |
1392 | __, __, __, __, __, __, __, __, | |
1393 | __, __, __, __, O_lt, __, O_gt, __, | |
1394 | __, __, __, __, __, __, __, __, | |
1395 | __, __, __, __, __, __, __, __, | |
1396 | __, __, __, __, __, __, __, __, | |
b585bc2c RH |
1397 | __, __, __, |
1398 | #ifdef NEED_INDEX_OPERATOR | |
1399 | O_index, | |
1400 | #else | |
1401 | __, | |
1402 | #endif | |
1403 | __, __, O_bit_exclusive_or, __, | |
252b5132 RH |
1404 | __, __, __, __, __, __, __, __, |
1405 | __, __, __, __, __, __, __, __, | |
1406 | __, __, __, __, __, __, __, __, | |
1407 | __, __, __, __, O_bit_inclusive_or, __, __, __, | |
1408 | ||
1409 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1410 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1411 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1412 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1413 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1414 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1415 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, | |
1416 | __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __ | |
1417 | }; | |
1418 | ||
929b12bc KH |
1419 | /* Rank Examples |
1420 | 0 operand, (expression) | |
1421 | 1 || | |
1422 | 2 && | |
07a7a145 | 1423 | 3 == <> < <= >= > |
929b12bc KH |
1424 | 4 + - |
1425 | 5 used for * / % in MRI mode | |
1426 | 6 & ^ ! | | |
1427 | 7 * / % << >> | |
1428 | 8 unary - unary ~ | |
1429 | */ | |
e6c774b4 | 1430 | static operator_rankT op_rank[] = { |
252b5132 RH |
1431 | 0, /* O_illegal */ |
1432 | 0, /* O_absent */ | |
1433 | 0, /* O_constant */ | |
1434 | 0, /* O_symbol */ | |
1435 | 0, /* O_symbol_rva */ | |
1436 | 0, /* O_register */ | |
16887944 | 1437 | 0, /* O_big */ |
b585bc2c RH |
1438 | 9, /* O_uminus */ |
1439 | 9, /* O_bit_not */ | |
1440 | 9, /* O_logical_not */ | |
1441 | 8, /* O_multiply */ | |
1442 | 8, /* O_divide */ | |
1443 | 8, /* O_modulus */ | |
1444 | 8, /* O_left_shift */ | |
1445 | 8, /* O_right_shift */ | |
1446 | 7, /* O_bit_inclusive_or */ | |
1447 | 7, /* O_bit_or_not */ | |
1448 | 7, /* O_bit_exclusive_or */ | |
1449 | 7, /* O_bit_and */ | |
1450 | 5, /* O_add */ | |
1451 | 5, /* O_subtract */ | |
1452 | 4, /* O_eq */ | |
1453 | 4, /* O_ne */ | |
1454 | 4, /* O_lt */ | |
1455 | 4, /* O_le */ | |
1456 | 4, /* O_ge */ | |
1457 | 4, /* O_gt */ | |
1458 | 3, /* O_logical_and */ | |
1459 | 2, /* O_logical_or */ | |
1460 | 1, /* O_index */ | |
446a06c9 MM |
1461 | 0, /* O_md1 */ |
1462 | 0, /* O_md2 */ | |
1463 | 0, /* O_md3 */ | |
1464 | 0, /* O_md4 */ | |
1465 | 0, /* O_md5 */ | |
1466 | 0, /* O_md6 */ | |
1467 | 0, /* O_md7 */ | |
1468 | 0, /* O_md8 */ | |
dd33dc0f MM |
1469 | 0, /* O_md9 */ |
1470 | 0, /* O_md10 */ | |
1471 | 0, /* O_md11 */ | |
1472 | 0, /* O_md12 */ | |
1473 | 0, /* O_md13 */ | |
1474 | 0, /* O_md14 */ | |
1475 | 0, /* O_md15 */ | |
1476 | 0, /* O_md16 */ | |
252b5132 RH |
1477 | }; |
1478 | ||
1479 | /* Unfortunately, in MRI mode for the m68k, multiplication and | |
1480 | division have lower precedence than the bit wise operators. This | |
1481 | function sets the operator precedences correctly for the current | |
1482 | mode. Also, MRI uses a different bit_not operator, and this fixes | |
1483 | that as well. */ | |
1484 | ||
16887944 AM |
1485 | #define STANDARD_MUL_PRECEDENCE 8 |
1486 | #define MRI_MUL_PRECEDENCE 6 | |
252b5132 RH |
1487 | |
1488 | void | |
dd625418 | 1489 | expr_set_precedence (void) |
252b5132 RH |
1490 | { |
1491 | if (flag_m68k_mri) | |
1492 | { | |
1493 | op_rank[O_multiply] = MRI_MUL_PRECEDENCE; | |
1494 | op_rank[O_divide] = MRI_MUL_PRECEDENCE; | |
1495 | op_rank[O_modulus] = MRI_MUL_PRECEDENCE; | |
1496 | } | |
1497 | else | |
1498 | { | |
1499 | op_rank[O_multiply] = STANDARD_MUL_PRECEDENCE; | |
1500 | op_rank[O_divide] = STANDARD_MUL_PRECEDENCE; | |
1501 | op_rank[O_modulus] = STANDARD_MUL_PRECEDENCE; | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | /* Initialize the expression parser. */ | |
1506 | ||
1507 | void | |
dd625418 | 1508 | expr_begin (void) |
252b5132 RH |
1509 | { |
1510 | expr_set_precedence (); | |
1511 | ||
1512 | /* Verify that X_op field is wide enough. */ | |
1513 | { | |
1514 | expressionS e; | |
1515 | e.X_op = O_max; | |
1516 | assert (e.X_op == O_max); | |
1517 | } | |
1518 | } | |
1519 | \f | |
6fad6acb AM |
1520 | /* Return the encoding for the operator at INPUT_LINE_POINTER, and |
1521 | sets NUM_CHARS to the number of characters in the operator. | |
1522 | Does not advance INPUT_LINE_POINTER. */ | |
252b5132 RH |
1523 | |
1524 | static inline operatorT | |
dd625418 | 1525 | operator (int *num_chars) |
252b5132 RH |
1526 | { |
1527 | int c; | |
1528 | operatorT ret; | |
1529 | ||
1530 | c = *input_line_pointer & 0xff; | |
6fad6acb | 1531 | *num_chars = 1; |
252b5132 | 1532 | |
b75c0c92 AM |
1533 | if (is_end_of_line[c]) |
1534 | return O_illegal; | |
1535 | ||
252b5132 RH |
1536 | switch (c) |
1537 | { | |
1538 | default: | |
1539 | return op_encoding[c]; | |
1540 | ||
3e4caed2 NS |
1541 | case '+': |
1542 | case '-': | |
1181c20e AM |
1543 | /* Do not allow a++b and a--b to be a + (+b) and a - (-b) |
1544 | Disabled, since the preprocessor removes whitespace. */ | |
1545 | if (1 || input_line_pointer[1] != c) | |
3e4caed2 NS |
1546 | return op_encoding[c]; |
1547 | return O_illegal; | |
1548 | ||
252b5132 RH |
1549 | case '<': |
1550 | switch (input_line_pointer[1]) | |
1551 | { | |
1552 | default: | |
1553 | return op_encoding[c]; | |
1554 | case '<': | |
1555 | ret = O_left_shift; | |
1556 | break; | |
1557 | case '>': | |
1558 | ret = O_ne; | |
1559 | break; | |
1560 | case '=': | |
1561 | ret = O_le; | |
1562 | break; | |
1563 | } | |
6fad6acb | 1564 | *num_chars = 2; |
252b5132 RH |
1565 | return ret; |
1566 | ||
1567 | case '=': | |
1568 | if (input_line_pointer[1] != '=') | |
1569 | return op_encoding[c]; | |
1570 | ||
6fad6acb | 1571 | *num_chars = 2; |
252b5132 RH |
1572 | return O_eq; |
1573 | ||
1574 | case '>': | |
1575 | switch (input_line_pointer[1]) | |
1576 | { | |
1577 | default: | |
1578 | return op_encoding[c]; | |
1579 | case '>': | |
1580 | ret = O_right_shift; | |
1581 | break; | |
1582 | case '=': | |
1583 | ret = O_ge; | |
1584 | break; | |
1585 | } | |
6fad6acb | 1586 | *num_chars = 2; |
252b5132 RH |
1587 | return ret; |
1588 | ||
1589 | case '!': | |
1590 | /* We accept !! as equivalent to ^ for MRI compatibility. */ | |
1591 | if (input_line_pointer[1] != '!') | |
1592 | { | |
1593 | if (flag_m68k_mri) | |
1594 | return O_bit_inclusive_or; | |
1595 | return op_encoding[c]; | |
1596 | } | |
6fad6acb | 1597 | *num_chars = 2; |
252b5132 RH |
1598 | return O_bit_exclusive_or; |
1599 | ||
1600 | case '|': | |
1601 | if (input_line_pointer[1] != '|') | |
1602 | return op_encoding[c]; | |
1603 | ||
6fad6acb | 1604 | *num_chars = 2; |
252b5132 RH |
1605 | return O_logical_or; |
1606 | ||
1607 | case '&': | |
1608 | if (input_line_pointer[1] != '&') | |
1609 | return op_encoding[c]; | |
1610 | ||
6fad6acb | 1611 | *num_chars = 2; |
252b5132 RH |
1612 | return O_logical_and; |
1613 | } | |
1614 | ||
929b12bc | 1615 | /* NOTREACHED */ |
252b5132 RH |
1616 | } |
1617 | ||
1618 | /* Parse an expression. */ | |
1619 | ||
1620 | segT | |
dd625418 KH |
1621 | expr (int rankarg, /* Larger # is higher rank. */ |
1622 | expressionS *resultP /* Deliver result here. */) | |
252b5132 | 1623 | { |
0561a208 | 1624 | operator_rankT rank = (operator_rankT) rankarg; |
252b5132 RH |
1625 | segT retval; |
1626 | expressionS right; | |
1627 | operatorT op_left; | |
1628 | operatorT op_right; | |
6fad6acb | 1629 | int op_chars; |
252b5132 RH |
1630 | |
1631 | know (rank >= 0); | |
1632 | ||
26346241 AM |
1633 | /* Save the value of dot for the fixup code. */ |
1634 | if (rank == 0) | |
1635 | dot_value = frag_now_fix (); | |
1636 | ||
252b5132 RH |
1637 | retval = operand (resultP); |
1638 | ||
929b12bc KH |
1639 | /* operand () gobbles spaces. */ |
1640 | know (*input_line_pointer != ' '); | |
252b5132 | 1641 | |
6fad6acb | 1642 | op_left = operator (&op_chars); |
252b5132 RH |
1643 | while (op_left != O_illegal && op_rank[(int) op_left] > rank) |
1644 | { | |
1645 | segT rightseg; | |
1646 | ||
6fad6acb | 1647 | input_line_pointer += op_chars; /* -> after operator. */ |
252b5132 RH |
1648 | |
1649 | rightseg = expr (op_rank[(int) op_left], &right); | |
1650 | if (right.X_op == O_absent) | |
1651 | { | |
1652 | as_warn (_("missing operand; zero assumed")); | |
1653 | right.X_op = O_constant; | |
1654 | right.X_add_number = 0; | |
1655 | right.X_add_symbol = NULL; | |
1656 | right.X_op_symbol = NULL; | |
1657 | } | |
1658 | ||
1659 | know (*input_line_pointer != ' '); | |
1660 | ||
b585bc2c RH |
1661 | if (op_left == O_index) |
1662 | { | |
1663 | if (*input_line_pointer != ']') | |
1664 | as_bad ("missing right bracket"); | |
1665 | else | |
1666 | { | |
1667 | ++input_line_pointer; | |
1668 | SKIP_WHITESPACE (); | |
1669 | } | |
1670 | } | |
1671 | ||
6fad6acb | 1672 | op_right = operator (&op_chars); |
252b5132 | 1673 | |
929b12bc KH |
1674 | know (op_right == O_illegal |
1675 | || op_rank[(int) op_right] <= op_rank[(int) op_left]); | |
252b5132 | 1676 | know ((int) op_left >= (int) O_multiply |
c9dea48b | 1677 | && (int) op_left <= (int) O_index); |
252b5132 | 1678 | |
929b12bc KH |
1679 | /* input_line_pointer->after right-hand quantity. */ |
1680 | /* left-hand quantity in resultP. */ | |
1681 | /* right-hand quantity in right. */ | |
1682 | /* operator in op_left. */ | |
252b5132 RH |
1683 | |
1684 | if (resultP->X_op == O_big) | |
1685 | { | |
1686 | if (resultP->X_add_number > 0) | |
1687 | as_warn (_("left operand is a bignum; integer 0 assumed")); | |
1688 | else | |
1689 | as_warn (_("left operand is a float; integer 0 assumed")); | |
1690 | resultP->X_op = O_constant; | |
1691 | resultP->X_add_number = 0; | |
1692 | resultP->X_add_symbol = NULL; | |
1693 | resultP->X_op_symbol = NULL; | |
1694 | } | |
1695 | if (right.X_op == O_big) | |
1696 | { | |
1697 | if (right.X_add_number > 0) | |
1698 | as_warn (_("right operand is a bignum; integer 0 assumed")); | |
1699 | else | |
1700 | as_warn (_("right operand is a float; integer 0 assumed")); | |
1701 | right.X_op = O_constant; | |
1702 | right.X_add_number = 0; | |
1703 | right.X_add_symbol = NULL; | |
1704 | right.X_op_symbol = NULL; | |
1705 | } | |
1706 | ||
1707 | /* Optimize common cases. */ | |
800eeca4 JW |
1708 | #ifdef md_optimize_expr |
1709 | if (md_optimize_expr (resultP, op_left, &right)) | |
1710 | { | |
929b12bc KH |
1711 | /* Skip. */ |
1712 | ; | |
800eeca4 JW |
1713 | } |
1714 | else | |
1715 | #endif | |
252b5132 RH |
1716 | if (op_left == O_add && right.X_op == O_constant) |
1717 | { | |
1718 | /* X + constant. */ | |
1719 | resultP->X_add_number += right.X_add_number; | |
1720 | } | |
1721 | /* This case comes up in PIC code. */ | |
1722 | else if (op_left == O_subtract | |
1723 | && right.X_op == O_symbol | |
1724 | && resultP->X_op == O_symbol | |
49309057 ILT |
1725 | && (symbol_get_frag (right.X_add_symbol) |
1726 | == symbol_get_frag (resultP->X_add_symbol)) | |
f6cf69d7 AM |
1727 | && (SEG_NORMAL (rightseg) |
1728 | || right.X_add_symbol == resultP->X_add_symbol)) | |
252b5132 RH |
1729 | { |
1730 | resultP->X_add_number -= right.X_add_number; | |
1731 | resultP->X_add_number += (S_GET_VALUE (resultP->X_add_symbol) | |
1732 | - S_GET_VALUE (right.X_add_symbol)); | |
1733 | resultP->X_op = O_constant; | |
1734 | resultP->X_add_symbol = 0; | |
1735 | } | |
1736 | else if (op_left == O_subtract && right.X_op == O_constant) | |
1737 | { | |
1738 | /* X - constant. */ | |
1739 | resultP->X_add_number -= right.X_add_number; | |
1740 | } | |
1741 | else if (op_left == O_add && resultP->X_op == O_constant) | |
1742 | { | |
1743 | /* Constant + X. */ | |
1744 | resultP->X_op = right.X_op; | |
1745 | resultP->X_add_symbol = right.X_add_symbol; | |
1746 | resultP->X_op_symbol = right.X_op_symbol; | |
1747 | resultP->X_add_number += right.X_add_number; | |
1748 | retval = rightseg; | |
1749 | } | |
1750 | else if (resultP->X_op == O_constant && right.X_op == O_constant) | |
1751 | { | |
1752 | /* Constant OP constant. */ | |
1753 | offsetT v = right.X_add_number; | |
1754 | if (v == 0 && (op_left == O_divide || op_left == O_modulus)) | |
1755 | { | |
1756 | as_warn (_("division by zero")); | |
1757 | v = 1; | |
1758 | } | |
1759 | switch (op_left) | |
1760 | { | |
1761 | default: abort (); | |
1762 | case O_multiply: resultP->X_add_number *= v; break; | |
1763 | case O_divide: resultP->X_add_number /= v; break; | |
1764 | case O_modulus: resultP->X_add_number %= v; break; | |
1765 | case O_left_shift: resultP->X_add_number <<= v; break; | |
1766 | case O_right_shift: | |
1767 | /* We always use unsigned shifts, to avoid relying on | |
02000999 | 1768 | characteristics of the compiler used to compile gas. */ |
252b5132 RH |
1769 | resultP->X_add_number = |
1770 | (offsetT) ((valueT) resultP->X_add_number >> (valueT) v); | |
1771 | break; | |
1772 | case O_bit_inclusive_or: resultP->X_add_number |= v; break; | |
1773 | case O_bit_or_not: resultP->X_add_number |= ~v; break; | |
1774 | case O_bit_exclusive_or: resultP->X_add_number ^= v; break; | |
1775 | case O_bit_and: resultP->X_add_number &= v; break; | |
1776 | case O_add: resultP->X_add_number += v; break; | |
1777 | case O_subtract: resultP->X_add_number -= v; break; | |
1778 | case O_eq: | |
1779 | resultP->X_add_number = | |
958b5f01 | 1780 | resultP->X_add_number == v ? ~ (offsetT) 0 : 0; |
252b5132 RH |
1781 | break; |
1782 | case O_ne: | |
1783 | resultP->X_add_number = | |
958b5f01 | 1784 | resultP->X_add_number != v ? ~ (offsetT) 0 : 0; |
252b5132 RH |
1785 | break; |
1786 | case O_lt: | |
1787 | resultP->X_add_number = | |
958b5f01 | 1788 | resultP->X_add_number < v ? ~ (offsetT) 0 : 0; |
252b5132 RH |
1789 | break; |
1790 | case O_le: | |
1791 | resultP->X_add_number = | |
958b5f01 | 1792 | resultP->X_add_number <= v ? ~ (offsetT) 0 : 0; |
252b5132 RH |
1793 | break; |
1794 | case O_ge: | |
1795 | resultP->X_add_number = | |
958b5f01 | 1796 | resultP->X_add_number >= v ? ~ (offsetT) 0 : 0; |
252b5132 RH |
1797 | break; |
1798 | case O_gt: | |
1799 | resultP->X_add_number = | |
958b5f01 | 1800 | resultP->X_add_number > v ? ~ (offsetT) 0 : 0; |
252b5132 RH |
1801 | break; |
1802 | case O_logical_and: | |
1803 | resultP->X_add_number = resultP->X_add_number && v; | |
1804 | break; | |
1805 | case O_logical_or: | |
1806 | resultP->X_add_number = resultP->X_add_number || v; | |
1807 | break; | |
1808 | } | |
1809 | } | |
1810 | else if (resultP->X_op == O_symbol | |
1811 | && right.X_op == O_symbol | |
1812 | && (op_left == O_add | |
1813 | || op_left == O_subtract | |
1814 | || (resultP->X_add_number == 0 | |
1815 | && right.X_add_number == 0))) | |
1816 | { | |
1817 | /* Symbol OP symbol. */ | |
1818 | resultP->X_op = op_left; | |
1819 | resultP->X_op_symbol = right.X_add_symbol; | |
1820 | if (op_left == O_add) | |
1821 | resultP->X_add_number += right.X_add_number; | |
1822 | else if (op_left == O_subtract) | |
e0890092 AM |
1823 | { |
1824 | resultP->X_add_number -= right.X_add_number; | |
1825 | if (retval == rightseg && SEG_NORMAL (retval)) | |
1826 | { | |
1827 | retval = absolute_section; | |
1828 | rightseg = absolute_section; | |
1829 | } | |
1830 | } | |
252b5132 RH |
1831 | } |
1832 | else | |
1833 | { | |
1834 | /* The general case. */ | |
1835 | resultP->X_add_symbol = make_expr_symbol (resultP); | |
1836 | resultP->X_op_symbol = make_expr_symbol (&right); | |
1837 | resultP->X_op = op_left; | |
1838 | resultP->X_add_number = 0; | |
1839 | resultP->X_unsigned = 1; | |
1840 | } | |
1841 | ||
e0890092 AM |
1842 | if (retval != rightseg) |
1843 | { | |
1844 | if (! SEG_NORMAL (retval)) | |
1845 | { | |
1846 | if (retval != undefined_section || SEG_NORMAL (rightseg)) | |
1847 | retval = rightseg; | |
1848 | } | |
1849 | else if (SEG_NORMAL (rightseg) | |
1850 | #ifdef DIFF_EXPR_OK | |
1851 | && op_left != O_subtract | |
1852 | #endif | |
1853 | ) | |
1854 | as_bad (_("operation combines symbols in different segments")); | |
1855 | } | |
1856 | ||
252b5132 | 1857 | op_left = op_right; |
929b12bc | 1858 | } /* While next operator is >= this rank. */ |
252b5132 RH |
1859 | |
1860 | /* The PA port needs this information. */ | |
1861 | if (resultP->X_add_symbol) | |
49309057 | 1862 | symbol_mark_used (resultP->X_add_symbol); |
252b5132 RH |
1863 | |
1864 | return resultP->X_op == O_constant ? absolute_section : retval; | |
1865 | } | |
1866 | \f | |
929b12bc KH |
1867 | /* This lives here because it belongs equally in expr.c & read.c. |
1868 | expr.c is just a branch office read.c anyway, and putting it | |
1869 | here lessens the crowd at read.c. | |
1870 | ||
1871 | Assume input_line_pointer is at start of symbol name. | |
1872 | Advance input_line_pointer past symbol name. | |
1873 | Turn that character into a '\0', returning its former value. | |
1874 | This allows a string compare (RMS wants symbol names to be strings) | |
1875 | of the symbol name. | |
1876 | There will always be a char following symbol name, because all good | |
1877 | lines end in end-of-line. */ | |
1878 | ||
252b5132 | 1879 | char |
dd625418 | 1880 | get_symbol_end (void) |
252b5132 RH |
1881 | { |
1882 | char c; | |
1883 | ||
1884 | /* We accept \001 in a name in case this is being called with a | |
1885 | constructed string. */ | |
1886 | if (is_name_beginner (c = *input_line_pointer++) || c == '\001') | |
58b5739a RH |
1887 | { |
1888 | while (is_part_of_name (c = *input_line_pointer++) | |
1889 | || c == '\001') | |
1890 | ; | |
1891 | if (is_name_ender (c)) | |
1892 | c = *input_line_pointer++; | |
1893 | } | |
252b5132 RH |
1894 | *--input_line_pointer = 0; |
1895 | return (c); | |
1896 | } | |
1897 | ||
252b5132 | 1898 | unsigned int |
dd625418 | 1899 | get_single_number (void) |
252b5132 RH |
1900 | { |
1901 | expressionS exp; | |
1902 | operand (&exp); | |
1903 | return exp.X_add_number; | |
252b5132 | 1904 | } |