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616915dd | 1 | /* |
11db3170 | 2 | ** Splint - annotation-assisted static program checker |
c59f5181 | 3 | ** Copyright (C) 1994-2003 University of Virginia, |
616915dd | 4 | ** Massachusetts Institute of Technology |
5 | ** | |
6 | ** This program is free software; you can redistribute it and/or modify it | |
7 | ** under the terms of the GNU General Public License as published by the | |
8 | ** Free Software Foundation; either version 2 of the License, or (at your | |
9 | ** option) any later version. | |
10 | ** | |
11 | ** This program is distributed in the hope that it will be useful, but | |
12 | ** WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | ** General Public License for more details. | |
15 | ** | |
16 | ** The GNU General Public License is available from http://www.gnu.org/ or | |
17 | ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
18 | ** MA 02111-1307, USA. | |
19 | ** | |
155af98d | 20 | ** For information on splint: info@splint.org |
21 | ** To report a bug: splint-bug@splint.org | |
11db3170 | 22 | ** For more information: http://www.splint.org |
616915dd | 23 | */ |
24 | /* | |
25 | ** cppexp.c | |
26 | */ | |
27 | /* Parse C expressions for CCCP. | |
28 | Copyright (C) 1987, 1992, 1994, 1995, 1997 Free Software Foundation. | |
29 | ||
30 | This program is free software; you can redistribute it and/or modify it | |
31 | under the terms of the GNU General Public License as published by the | |
32 | Free Software Foundation; either version 2, or (at your option) any | |
33 | later version. | |
34 | ||
35 | This program is distributed in the hope that it will be useful, | |
36 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
37 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
38 | GNU General Public License for more details. | |
39 | ||
40 | You should have received a copy of the GNU General Public License | |
41 | along with this program; if not, write to the Free Software | |
42 | Foundation, 59 Temple Place - Suite 330, | |
43 | Boston, MA 02111-1307, USA. | |
44 | ||
45 | In other words, you are welcome to use, share and improve this program. | |
46 | You are forbidden to forbid anyone else to use, share and improve | |
47 | what you give them. Help stamp out software-hoarding! | |
48 | ||
49 | Written by Per Bothner 1994. */ | |
50 | ||
51 | /* Parse a C expression from text in a string */ | |
52 | ||
53 | /*@+charint@*/ | |
54 | /*@+ignorequals@*/ | |
55 | /*@+ignoresigns@*/ | |
56 | /*@+matchanyintegral@*/ | |
616915dd | 57 | |
58 | # include <string.h> | |
1b8ae690 | 59 | # include "splintMacros.nf" |
b73d1009 | 60 | # include "basic.h" |
616915dd | 61 | # include "cpplib.h" |
62 | # include "cpphash.h" | |
63 | # include "cppexp.h" | |
64 | # include "cpperror.h" | |
65 | ||
66 | /* Yield nonzero if adding two numbers with A's and B's signs can yield a | |
67 | number with SUM's sign, where A, B, and SUM are all C integers. */ | |
68 | ||
69 | /*@function static bool possibleSumSign (sef int, int, int) | |
70 | modifies nothing ; @*/ | |
71 | ||
72 | #define possibleSumSign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0) | |
73 | ||
74 | /* these are guesses! */ | |
75 | ||
a956d444 | 76 | /*@constant int BITS_PER_UNIT = 8@*/ |
616915dd | 77 | # define BITS_PER_UNIT 8 |
78 | ||
79 | /*@constant size_t BITS_PER_CHAR@*/ | |
80 | # define BITS_PER_CHAR 8 | |
81 | ||
82 | /*@constant size_t BITS_PER_WORD@*/ | |
83 | # define BITS_PER_WORD 32 | |
84 | ||
85 | /*@constant size_t HOST_BITS_PER_INT@*/ | |
86 | # define HOST_BITS_PER_INT 32 | |
87 | ||
a956d444 | 88 | /*@constant size_t HOST_BITS_PER_LONG = 32@*/ |
616915dd | 89 | # define HOST_BITS_PER_LONG 32 |
90 | ||
91 | /*@constant char TARGET_BELL@*/ | |
92 | # define TARGET_BELL (char) 6 | |
93 | ||
94 | /*@constant char TARGET_BS@*/ | |
95 | # define TARGET_BS (char) 7 | |
96 | ||
97 | /*@constant char TARGET_FF@*/ | |
98 | # define TARGET_FF (char) 8 | |
99 | ||
100 | /*@constant char TARGET_NEWLINE@*/ | |
101 | # define TARGET_NEWLINE '\n' | |
102 | ||
103 | /*@constant char TARGET_CR@*/ | |
104 | # define TARGET_CR '\n' | |
105 | ||
106 | /*@constant char TARGET_TAB@*/ | |
107 | # define TARGET_TAB '\t' | |
108 | ||
109 | /*@constant char TARGET_VT@*/ | |
110 | # define TARGET_VT '\v' | |
111 | ||
112 | #ifdef MULTIBYTE_CHARS | |
113 | #include <stdlib.h> | |
114 | #include <locale.h> | |
115 | #endif | |
116 | ||
117 | #include <stdio.h> | |
118 | ||
119 | #ifndef INT_TYPE_SIZE | |
120 | /*@constant size_t INT_TYPE_SIZE@*/ | |
121 | #define INT_TYPE_SIZE BITS_PER_WORD | |
122 | #endif | |
123 | ||
124 | #ifndef LONG_TYPE_SIZE | |
125 | /*@constant size_t LONG_TYPE_SIZE@*/ | |
126 | #define LONG_TYPE_SIZE BITS_PER_WORD | |
127 | #endif | |
128 | ||
129 | #ifndef WCHAR_TYPE_SIZE | |
130 | /*@constant size_t WCHAR_TYPE_SIZE@*/ | |
131 | #define WCHAR_TYPE_SIZE INT_TYPE_SIZE | |
132 | #endif | |
133 | ||
134 | # ifndef CHAR_TYPE_SIZE | |
135 | /*@constant size_t CHAR_TYPE_SIZE@*/ | |
136 | # define CHAR_TYPE_SIZE BITS_PER_CHAR | |
137 | # endif | |
138 | ||
139 | #ifndef MAX_CHAR_TYPE_SIZE | |
140 | /*@constant size_t MAX_CHAR_TYPE_SIZE@*/ | |
141 | #define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE | |
142 | #endif | |
143 | ||
144 | #ifndef MAX_LONG_TYPE_SIZE | |
145 | /*@constant size_t MAX_LONG_TYPE_SIZE@*/ | |
146 | #define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE | |
147 | #endif | |
148 | ||
149 | #ifndef MAX_WCHAR_TYPE_SIZE | |
150 | /*@constant size_t MAX_WCHAR_TYPE_SIZE@*/ | |
151 | #define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE | |
152 | #endif | |
153 | ||
3e3ec469 | 154 | static struct operation cppexp_lex (cppReader *); |
616915dd | 155 | static void integer_overflow (cppReader *); |
c3be2604 | 156 | static long left_shift (cppReader *, long, bool p_unsignedp, unsigned long); |
616915dd | 157 | static long right_shift (long, bool p_unsignedp, unsigned long); |
158 | ||
159 | /*@constant short CPPREADER_ERRORTOK@*/ | |
160 | #define CPPREADER_ERRORTOK 299 | |
161 | ||
162 | /*@constant int OROR@*/ | |
163 | #define OROR 300 | |
164 | ||
165 | /*@constant int ANDAND@*/ | |
166 | #define ANDAND 301 | |
167 | ||
168 | /*@constant int CPP_EQUALTOK@*/ | |
169 | #define CPP_EQUALTOK 302 | |
170 | ||
171 | /*@constant int NOTEQUAL@*/ | |
172 | #define NOTEQUAL 303 | |
173 | ||
174 | /*@constant int LEQ@*/ | |
175 | #define LEQ 304 | |
176 | ||
177 | /*@constant int GEQ@*/ | |
178 | #define GEQ 305 | |
179 | ||
180 | /*@constant int LSH@*/ | |
181 | #define LSH 306 | |
182 | ||
183 | /*@constant int RSH@*/ | |
184 | #define RSH 307 | |
185 | ||
186 | /*@constant int NAME@*/ | |
187 | #define NAME 308 | |
188 | ||
189 | /*@constant short CPPEXP_INT@*/ | |
190 | #define CPPEXP_INT 309 | |
191 | ||
192 | /*@constant short CPPEXP_CHAR@*/ | |
193 | #define CPPEXP_CHAR 310 | |
194 | ||
195 | /*@constant int LEFT_OPERAND_REQUIRED@*/ | |
196 | #define LEFT_OPERAND_REQUIRED 1 | |
197 | ||
198 | /*@constant int RIGHT_OPERAND_REQUIRED@*/ | |
199 | #define RIGHT_OPERAND_REQUIRED 2 | |
200 | ||
201 | /*@constant int HAVE_VALUE@*/ | |
202 | #define HAVE_VALUE 4 | |
203 | ||
204 | #ifndef HOST_BITS_PER_WIDE_INT | |
205 | ||
206 | #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT | |
207 | /*@constant int HOST_BITS_PER_WIDE_INT@*/ | |
208 | #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG | |
209 | /*@notfunction@*/ | |
210 | #define HOST_WIDE_INT long | |
211 | #else | |
212 | /*@constant int HOST_BITS_PER_WIDE_INT@*/ | |
213 | #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT | |
214 | /*@notfunction@*/ | |
215 | #define HOST_WIDE_INT long | |
216 | #endif | |
217 | ||
218 | #endif | |
219 | ||
220 | struct operation { | |
221 | short op; | |
222 | ||
223 | /* Priority of op (relative to it right operand). */ | |
224 | /*@reldef@*/ char rprio; | |
225 | ||
226 | /*@reldef@*/ char flags; | |
227 | ||
228 | /* true if value should be treated as unsigned */ | |
229 | /*@reldef@*/ bool unsignedp; | |
230 | ||
231 | /* The value logically "right" of op. */ | |
232 | /*@reldef@*/ HOST_WIDE_INT value; | |
233 | } ; | |
234 | ||
235 | /* Take care of parsing a number (anything that starts with a digit). | |
236 | LEN is the number of characters in it. */ | |
237 | ||
238 | /* maybe needs to actually deal with floating point numbers */ | |
239 | ||
240 | struct operation | |
86d93ed3 | 241 | cppReader_parseNumber (cppReader *pfile, char *start, int olen) /*@requires maxRead(start) >= (olen - 1) @*/ |
616915dd | 242 | { |
243 | struct operation op; | |
244 | char *p = start; | |
245 | char c; | |
246 | int i; | |
247 | long n = 0; | |
248 | unsigned long nd, ULONG_MAX_over_base; | |
249 | int base = 10; | |
250 | int len = olen; | |
251 | bool overflow = FALSE; | |
252 | int digit, largest_digit = 0; | |
253 | bool spec_long = FALSE; | |
254 | ||
255 | op.unsignedp = FALSE; | |
256 | ||
257 | for (i = 0; i < len; i++) | |
258 | { | |
8fd556fb | 259 | if (p[i] == '.') { |
616915dd | 260 | /* It's a float since it contains a point. */ |
261 | cppReader_errorLit | |
262 | (pfile, | |
263 | cstring_makeLiteralTemp | |
264 | ("Floating point numbers not allowed in #if expressions")); | |
265 | op.op = CPPREADER_ERRORTOK; | |
266 | return op; | |
267 | } | |
268 | } | |
269 | ||
270 | if (len >= 3 && (mstring_equalPrefix (p, "0x") | |
271 | || mstring_equalPrefix (p, "0X"))) | |
272 | { | |
273 | p += 2; | |
274 | base = 16; | |
275 | len -= 2; | |
276 | } | |
277 | else if (*p == '0') | |
278 | { | |
279 | base = 8; | |
280 | } | |
281 | else | |
282 | { | |
283 | ; | |
284 | } | |
285 | ||
286 | /* Some buggy compilers (e.g. MPW C) seem to need both casts. */ | |
287 | ULONG_MAX_over_base = ((unsigned long) -1) / ((unsigned long) base); | |
288 | ||
289 | for (; len > 0; len--) { | |
290 | c = *p++; | |
291 | ||
292 | if (c >= '0' && c <= '9') | |
293 | { | |
294 | digit = (int) (c - '0'); | |
295 | } | |
296 | else if (base == 16 && c >= 'a' && c <= 'f') | |
297 | { | |
298 | digit = (int) (c - 'a') + 10; | |
299 | } | |
300 | else if (base == 16 && c >= 'A' && c <= 'F') | |
301 | { | |
302 | digit = (int) (c - 'A') + 10; | |
303 | } | |
304 | else | |
305 | { | |
306 | /* `l' means long, and `u' means unsigned. */ | |
307 | while (TRUE) | |
308 | { | |
309 | if (c == 'l' || c == 'L') | |
310 | { | |
311 | if (spec_long) | |
312 | cppReader_errorLit (pfile, | |
313 | cstring_makeLiteralTemp ("two `l's in integer constant")); | |
314 | spec_long = TRUE; | |
315 | } | |
316 | else if (c == 'u' || c == 'U') | |
317 | { | |
318 | if (op.unsignedp) | |
319 | cppReader_errorLit (pfile, | |
320 | cstring_makeLiteralTemp ("two `u's in integer constant")); | |
321 | op.unsignedp = TRUE; | |
322 | } | |
323 | else | |
324 | { | |
325 | /*@innerbreak@*/ break; | |
326 | } | |
327 | ||
328 | if (--len == 0) | |
329 | { | |
330 | /*@innerbreak@*/ break; | |
331 | } | |
332 | ||
8fd556fb | 333 | c = *p++; |
616915dd | 334 | } |
335 | /* Don't look for any more digits after the suffixes. */ | |
336 | break; | |
337 | } | |
338 | ||
339 | if (largest_digit < digit) | |
340 | { | |
341 | largest_digit = digit; | |
342 | } | |
343 | ||
344 | nd = (long unsigned) (n * base + digit); | |
345 | overflow |= (ULONG_MAX_over_base < (unsigned long) n) | |
346 | | (nd < (unsigned long) n); | |
347 | n = (long) nd; | |
348 | } | |
349 | ||
350 | if (len != 0) | |
351 | { | |
352 | cppReader_errorLit | |
353 | (pfile, | |
354 | cstring_makeLiteralTemp ("Invalid number in #if expression")); | |
355 | op.op = CPPREADER_ERRORTOK; | |
356 | return op; | |
357 | } | |
358 | ||
359 | if (base <= largest_digit) | |
360 | { | |
361 | cppReader_pedwarnLit | |
362 | (pfile, | |
363 | cstring_makeLiteralTemp | |
364 | ("Integer constant contains digits beyond the radix")); | |
365 | } | |
366 | ||
367 | if (overflow) | |
368 | { | |
369 | cppReader_pedwarnLit | |
370 | (pfile, | |
371 | cstring_makeLiteralTemp ("Integer constant out of range")); | |
372 | } | |
373 | ||
374 | /* If too big to be signed, consider it unsigned. */ | |
375 | if ((long) n < 0 && ! op.unsignedp) | |
376 | { | |
377 | if (base == 10) | |
378 | { | |
379 | cppReader_warningLit | |
380 | (pfile, | |
381 | cstring_makeLiteralTemp ("Integer constant is so large that it is unsigned")); | |
382 | } | |
383 | ||
384 | op.unsignedp = TRUE; | |
385 | } | |
386 | ||
387 | op.value = n; | |
388 | op.op = CPPEXP_INT; | |
3e3ec469 | 389 | DPRINTF (("Parse number: %d", op.value)); |
616915dd | 390 | return op; |
391 | } | |
392 | ||
393 | struct token { | |
394 | /*@null@*/ /*@observer@*/ char *operator; | |
395 | int token; | |
396 | }; | |
397 | ||
398 | static struct token tokentab2[] = { | |
399 | { "&&", ANDAND }, | |
400 | { "||", OROR }, | |
401 | { "<<", LSH }, | |
402 | { ">>", RSH }, | |
403 | { "==", CPP_EQUALTOK }, | |
404 | { "!=", NOTEQUAL }, | |
405 | { "<=", LEQ }, | |
406 | { ">=", GEQ }, | |
407 | { "++", CPPREADER_ERRORTOK }, | |
408 | { "--", CPPREADER_ERRORTOK }, | |
409 | { NULL, CPPREADER_ERRORTOK } | |
410 | } ; | |
411 | ||
412 | /* Read one token. */ | |
413 | ||
3e3ec469 | 414 | struct operation cppexp_lex (cppReader *pfile) |
616915dd | 415 | { |
416 | int ic; | |
417 | char c; | |
418 | register struct token *toktab; | |
419 | enum cpp_token token; | |
420 | struct operation op; | |
421 | char *tok_start, *tok_end; | |
422 | int old_written; | |
423 | ||
424 | retry: | |
3e3ec469 | 425 | |
426 | old_written = size_toInt (cpplib_getWritten (pfile)); | |
616915dd | 427 | cppSkipHspace (pfile); |
3e3ec469 | 428 | ic = cpplib_bufPeek (cppReader_getBufferSafe (pfile)); |
616915dd | 429 | |
430 | c = (char) ic; | |
abd7f895 | 431 | |
432 | if (c == '#') | |
433 | { | |
434 | /* was: llassert (c != '#'); - Solaris uses this, attempt to continue anyway... */ | |
435 | cppReader_pedwarn (pfile, | |
436 | message ("non-standard pre-processor directive: %c", c)); | |
437 | } | |
438 | ||
3e3ec469 | 439 | DPRINTF (("Read: %c", c)); |
440 | ||
616915dd | 441 | if (c == '\n') |
442 | { | |
443 | op.op = 0; | |
444 | return op; | |
445 | } | |
446 | ||
3e3ec469 | 447 | token = cpplib_getTokenForceExpand (pfile); |
448 | ||
616915dd | 449 | tok_start = pfile->token_buffer + old_written; |
3e3ec469 | 450 | tok_end = cpplib_getPWritten (pfile); |
451 | ||
452 | DPRINTF (("Token: %s < %s", tok_start, tok_end)); | |
453 | ||
616915dd | 454 | pfile->limit = tok_start; |
455 | ||
456 | switch (token) | |
3e3ec469 | 457 | { |
616915dd | 458 | case CPP_EOF: /* Should not happen ... */ |
459 | case CPP_VSPACE: | |
460 | op.op = 0; | |
461 | return op; | |
462 | case CPP_POP: | |
463 | if (cstring_isDefined (cppReader_getBufferSafe (pfile)->fname)) | |
464 | { | |
465 | op.op = 0; | |
466 | return op; | |
467 | } | |
468 | (void) cppReader_popBuffer (pfile); | |
469 | goto retry; | |
470 | case CPP_HSPACE: case CPP_COMMENT: | |
471 | goto retry; | |
472 | case CPP_NUMBER: | |
473 | return cppReader_parseNumber (pfile, tok_start, tok_end - tok_start); | |
474 | case CPP_STRING: | |
475 | cppReader_errorLit (pfile, | |
3e3ec469 | 476 | cstring_makeLiteralTemp ("string constants not allowed in #if expressions")); |
616915dd | 477 | op.op = CPPREADER_ERRORTOK; |
478 | return op; | |
479 | case CPP_CHAR: | |
480 | /* This code for reading a character constant | |
481 | handles multicharacter constants and wide characters. | |
482 | It is mostly copied from c-lex.c. */ | |
483 | { | |
484 | int result = 0; | |
485 | int num_chars = 0; | |
486 | size_t width = MAX_CHAR_TYPE_SIZE; | |
487 | int wide_flag = 0; | |
488 | int max_chars; | |
489 | char *ptr = tok_start; | |
490 | #ifdef MULTIBYTE_CHARS | |
491 | char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + MB_CUR_MAX]; | |
492 | #else | |
493 | char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1]; | |
494 | #endif | |
3e3ec469 | 495 | |
616915dd | 496 | if (*ptr == 'L') |
497 | { | |
498 | ptr++; | |
499 | wide_flag = 1; | |
500 | width = MAX_WCHAR_TYPE_SIZE; | |
501 | #ifdef MULTIBYTE_CHARS | |
502 | max_chars = MB_CUR_MAX; | |
503 | #else | |
504 | max_chars = 1; | |
505 | #endif | |
506 | } | |
507 | else | |
508 | { | |
509 | max_chars = size_toInt (MAX_LONG_TYPE_SIZE / width); | |
510 | } | |
3e3ec469 | 511 | |
616915dd | 512 | ++ptr; |
8fd556fb | 513 | while (ptr < tok_end && ((c = *ptr++) != '\'')) |
616915dd | 514 | { |
515 | if (c == '\\') | |
516 | { | |
517 | c = cppReader_parseEscape (pfile, &ptr); | |
518 | if (width < HOST_BITS_PER_INT && c >= (1 << width)) | |
519 | { | |
520 | cppReader_pedwarnLit | |
521 | (pfile, | |
522 | cstring_makeLiteralTemp ("Escape sequence out of range for character")); | |
523 | } | |
524 | } | |
525 | ||
526 | num_chars++; | |
527 | ||
528 | /* Merge character into result; ignore excess chars. */ | |
529 | if (num_chars < max_chars + 1) | |
530 | { | |
531 | if (width < HOST_BITS_PER_INT) | |
532 | { | |
533 | result = (int) ((unsigned) result << width) | (c & ((1 << width) - 1)); | |
534 | } | |
535 | else | |
536 | { | |
537 | result = c; | |
538 | } | |
539 | ||
540 | token_buffer[num_chars - 1] = c; | |
541 | } | |
542 | } | |
543 | ||
8fd556fb | 544 | token_buffer[num_chars] = 0; |
616915dd | 545 | |
546 | if (c != '\'') | |
547 | cppReader_errorLit (pfile, | |
80489f0a | 548 | cstring_makeLiteralTemp ("malformatted character constant")); |
616915dd | 549 | else if (num_chars == 0) |
550 | cppReader_errorLit (pfile, | |
80489f0a | 551 | cstring_makeLiteralTemp ("empty character constant")); |
616915dd | 552 | else if (num_chars > max_chars) |
553 | { | |
554 | num_chars = max_chars; | |
555 | cppReader_errorLit (pfile, | |
80489f0a | 556 | cstring_makeLiteralTemp ("character constant too long")); |
616915dd | 557 | } |
558 | else if (num_chars != 1 && ! cppReader_isTraditional (pfile)) | |
559 | { | |
560 | cppReader_warningLit (pfile, | |
80489f0a | 561 | cstring_makeLiteralTemp ("multi-character character constant")); |
616915dd | 562 | } |
563 | else | |
564 | { | |
565 | ; | |
566 | } | |
567 | ||
568 | /* If char type is signed, sign-extend the constant. */ | |
569 | if (wide_flag == 0) | |
570 | { | |
571 | int num_bits = num_chars * width; | |
572 | ||
3e3ec469 | 573 | if ((cpphash_lookup ("__CHAR_UNSIGNED__", |
616915dd | 574 | sizeof ("__CHAR_UNSIGNED__") - 1, -1) != NULL) |
a956d444 | 575 | || (((unsigned) result >> (int_toNonNegative (num_bits - 1))) & 1) == 0) |
616915dd | 576 | { |
577 | op.value | |
a956d444 | 578 | = result & ((unsigned long) ~0 |
579 | >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits))); | |
616915dd | 580 | } |
581 | else | |
582 | { | |
583 | op.value | |
a956d444 | 584 | = result | ~((unsigned long) ~0 |
585 | >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits))); | |
616915dd | 586 | } |
587 | } | |
588 | else | |
589 | { | |
590 | #ifdef MULTIBYTE_CHARS | |
591 | /* Set the initial shift state and convert the next sequence. */ | |
592 | result = 0; | |
593 | /* In all locales L'\0' is zero and mbtowc will return zero, | |
594 | so don't use it. */ | |
595 | if (num_chars > 1 | |
596 | || (num_chars == 1 && token_buffer[0] != '\0')) | |
597 | { | |
598 | wchar_t wc; | |
599 | (void) mbtowc (NULL, NULL, 0); | |
600 | if (mbtowc (& wc, token_buffer, num_chars) == num_chars) | |
601 | result = wc; | |
602 | else | |
603 | cppReader_pedwarn (pfile,"Ignoring invalid multibyte character"); | |
604 | } | |
605 | #endif | |
606 | op.value = result; | |
607 | } | |
608 | } | |
609 | ||
610 | /* This is always a signed type. */ | |
611 | op.unsignedp = FALSE; | |
612 | op.op = CPPEXP_CHAR; | |
613 | ||
614 | return op; | |
615 | ||
616 | case CPP_NAME: | |
3e3ec469 | 617 | DPRINTF (("Name!")); |
616915dd | 618 | return cppReader_parseNumber (pfile, "0", 0); |
619 | ||
620 | case CPP_OTHER: | |
621 | /* See if it is a special token of length 2. */ | |
622 | if (tok_start + 2 == tok_end) | |
623 | { | |
624 | for (toktab = tokentab2; toktab->operator != NULL; toktab++) | |
625 | { | |
8fd556fb | 626 | if (tok_start[0] == toktab->operator[0] && |
627 | tok_start[1] == toktab->operator[1]) | |
616915dd | 628 | { |
629 | /*@loopbreak@*/ break; | |
630 | } | |
631 | } | |
632 | ||
633 | if (toktab->token == CPPREADER_ERRORTOK) | |
634 | { | |
80489f0a | 635 | cppReader_error (pfile, |
636 | message ("`%s' not allowed in operand of `#if'", | |
637 | cstring_fromChars (tok_start))); | |
616915dd | 638 | } |
639 | ||
640 | op.op = toktab->token; | |
641 | return op; | |
642 | } | |
643 | /*@fallthrough@*/ | |
644 | default: | |
645 | op.op = *tok_start; | |
646 | return op; | |
647 | } | |
648 | ||
649 | BADEXIT; | |
650 | /*@notreached@*/ | |
651 | } | |
652 | ||
653 | ||
654 | /* Parse a C escape sequence. STRING_PTR points to a variable | |
655 | containing a pointer to the string to parse. That pointer | |
656 | is updated past the characters we use. The value of the | |
657 | escape sequence is returned. | |
658 | ||
659 | A negative value means the sequence \ newline was seen, | |
660 | which is supposed to be equivalent to nothing at all. | |
661 | ||
662 | If \ is followed by a null character, we return a negative | |
663 | value and leave the string pointer pointing at the null character. | |
664 | ||
665 | If \ is followed by 000, we return 0 and leave the string pointer | |
666 | after the zeros. A value of 0 does not mean end of string. */ | |
667 | ||
668 | int | |
669 | cppReader_parseEscape (cppReader *pfile, char **string_ptr) | |
670 | { | |
8fd556fb | 671 | char c = *(*string_ptr)++; |
616915dd | 672 | |
673 | switch (c) | |
674 | { | |
675 | case 'a': | |
676 | return TARGET_BELL; | |
677 | case 'b': | |
678 | return TARGET_BS; | |
679 | case 'e': | |
680 | case 'E': | |
681 | if (cppReader_isPedantic (pfile)) | |
682 | { | |
683 | cppReader_pedwarn (pfile, | |
155af98d | 684 | message ("non-standard escape sequence, `\\%c'", c)); |
616915dd | 685 | } |
686 | return (char) 033; | |
687 | case 'f': | |
688 | return TARGET_FF; | |
689 | case 'n': | |
690 | return TARGET_NEWLINE; | |
691 | case 'r': | |
692 | return TARGET_CR; | |
693 | case 't': | |
694 | return TARGET_TAB; | |
695 | case 'v': | |
696 | return TARGET_VT; | |
697 | case '\n': | |
698 | return -2; | |
699 | case 0: | |
700 | (*string_ptr)--; | |
701 | return 0; | |
702 | ||
703 | case '0': | |
704 | case '1': | |
705 | case '2': | |
706 | case '3': | |
707 | case '4': | |
708 | case '5': | |
709 | case '6': | |
710 | case '7': | |
711 | { | |
712 | int i = (int) c - '0'; | |
713 | int count = 0; | |
714 | ||
715 | while (++count < 3) | |
716 | { | |
717 | c = *(*string_ptr)++; | |
718 | if (c >= '0' && c <= '7') | |
719 | { | |
720 | i = ((unsigned) i << 3) + c - '0'; | |
721 | } | |
722 | ||
723 | else | |
724 | { | |
8fd556fb | 725 | (*string_ptr)--; |
616915dd | 726 | /*@loopbreak@*/ break; |
727 | } | |
728 | } | |
729 | if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0) | |
730 | { | |
731 | i &= (1 << MAX_CHAR_TYPE_SIZE) - 1; | |
732 | cppReader_pedwarnLit (pfile, | |
733 | cstring_makeLiteralTemp ("octal character constant does not fit in a byte")); | |
734 | } | |
735 | return i; | |
736 | } | |
737 | case 'x': | |
738 | { | |
739 | register unsigned i = 0, overflow = 0, digits_found = 0, digit; | |
740 | for (;;) | |
741 | { | |
742 | c = *(*string_ptr)++; | |
743 | ||
744 | if (c >= '0' && c <= '9') | |
745 | { | |
746 | digit = (unsigned int) (c - '0'); | |
747 | } | |
748 | else if (c >= 'a' && c <= 'f') | |
749 | { | |
750 | digit = (unsigned int) (c - 'a') + 10; | |
751 | } | |
752 | else if (c >= 'A' && c <= 'F') | |
753 | { | |
754 | digit = (unsigned int) (c - 'A') + 10; | |
755 | } | |
756 | else | |
757 | { | |
758 | (*string_ptr)--; | |
759 | /*@loopbreak@*/ break; | |
760 | } | |
761 | overflow |= i ^ (i << 4 >> 4); | |
762 | i = (i << 4) + digit; | |
763 | digits_found = 1; | |
764 | } | |
765 | ||
766 | if (digits_found == 0) | |
767 | { | |
768 | cppReader_errorLit (pfile, | |
769 | cstring_makeLiteralTemp ("\\x used with no following hex digits")); | |
770 | } | |
771 | ||
a956d444 | 772 | if ((overflow | (i & ~((1 << int_toNonNegative (BITS_PER_UNIT)) - 1))) != 0) |
616915dd | 773 | { |
774 | i &= (1 << BITS_PER_UNIT) - 1; | |
775 | cppReader_pedwarnLit (pfile, | |
776 | cstring_makeLiteralTemp ("hex character constant does not fit in a byte")); | |
777 | } | |
778 | ||
779 | return i; | |
780 | } | |
781 | default: | |
782 | return c; | |
783 | } | |
784 | } | |
785 | ||
786 | static void | |
787 | integer_overflow (cppReader *pfile) | |
788 | { | |
789 | if (cppReader_isPedantic (pfile)) | |
790 | cppReader_pedwarnLit (pfile, | |
791 | cstring_makeLiteralTemp ("integer overflow in preprocessor expression")); | |
792 | } | |
793 | ||
794 | static long | |
c3be2604 | 795 | left_shift (cppReader *pfile, long a, bool unsignedp, unsigned long b) |
616915dd | 796 | { |
797 | if (b >= HOST_BITS_PER_LONG) | |
798 | { | |
799 | if (!unsignedp && a != 0) | |
800 | { | |
801 | integer_overflow (pfile); | |
802 | } | |
803 | ||
804 | return 0; | |
805 | } | |
806 | else if (unsignedp) | |
807 | { | |
808 | return (unsigned long) a << b; | |
809 | } | |
810 | else | |
811 | { | |
b8dce3c7 | 812 | /*@-shiftimplementation@*/ |
813 | long l = a << b; /* int_toNonNegative removed (allow shifts of negative values) */ | |
4dd72714 | 814 | |
815 | # ifdef WIN32 | |
816 | # pragma warning( disable : 4018 ) | |
817 | # endif | |
818 | ||
b8dce3c7 | 819 | if (l >> b != a) /* int_toNonNegative removed (allow shifts of negative values) */ |
616915dd | 820 | { |
821 | integer_overflow (pfile); | |
822 | } | |
823 | ||
824 | return l; | |
825 | } | |
826 | } | |
827 | ||
828 | static long | |
829 | right_shift (long a, bool unsignedp, unsigned long b) | |
830 | { | |
831 | if (b >= HOST_BITS_PER_LONG) | |
a956d444 | 832 | return (unsignedp ? 0 : int_toNonNegative (a) >> (HOST_BITS_PER_LONG - 1)); |
616915dd | 833 | else if (unsignedp) |
834 | return (unsigned long) a >> b; | |
835 | else | |
b8dce3c7 | 836 | return a >> b; /* int_toNonNegative removed (allow shifts of negative values) */ |
837 | /*@=shiftimplementation@*/ | |
616915dd | 838 | } |
839 | ||
840 | /* These priorities are all even, so we can handle associatively. */ | |
841 | ||
842 | /*@constant int PAREN_INNER_PRIO@*/ | |
843 | #define PAREN_INNER_PRIO 0 | |
844 | ||
845 | /*@constant int COMMA_PRIO@*/ | |
846 | #define COMMA_PRIO 4 | |
847 | ||
848 | /*@constant int COND_PRIO@*/ | |
849 | #define COND_PRIO (COMMA_PRIO+2) | |
850 | ||
851 | /*@constant int OROR_PRIO@*/ | |
852 | #define OROR_PRIO (COND_PRIO+2) | |
853 | ||
854 | /*@constant int ANDAND_PRIO@*/ | |
855 | #define ANDAND_PRIO (OROR_PRIO+2) | |
856 | ||
857 | /*@constant int OR_PRIO@*/ | |
858 | #define OR_PRIO (ANDAND_PRIO+2) | |
859 | ||
860 | /*@constant int XOR_PRIO@*/ | |
861 | #define XOR_PRIO (OR_PRIO+2) | |
862 | ||
863 | /*@constant int AND_PRIO@*/ | |
864 | #define AND_PRIO (XOR_PRIO+2) | |
865 | ||
866 | /*@constant int CPP_EQUAL_PRIO@*/ | |
867 | #define CPP_EQUAL_PRIO (AND_PRIO+2) | |
868 | ||
869 | /*@constant int LESS_PRIO@*/ | |
870 | #define LESS_PRIO (CPP_EQUAL_PRIO+2) | |
871 | ||
872 | /*@constant int SHIFT_PRIO@*/ | |
873 | #define SHIFT_PRIO (LESS_PRIO+2) | |
874 | ||
875 | /*@constant int PLUS_PRIO@*/ | |
876 | #define PLUS_PRIO (SHIFT_PRIO+2) | |
877 | ||
878 | /*@constant int MUL_PRIO@*/ | |
879 | #define MUL_PRIO (PLUS_PRIO+2) | |
880 | ||
881 | /*@constant int UNARY_PRIO@*/ | |
882 | #define UNARY_PRIO (MUL_PRIO+2) | |
883 | ||
884 | /*@constant int PAREN_OUTER_PRIO@*/ | |
885 | #define PAREN_OUTER_PRIO (UNARY_PRIO+2) | |
886 | ||
887 | /*@notfunction@*/ | |
888 | #define COMPARE(OP) \ | |
889 | top->unsignedp = FALSE;\ | |
890 | top->value = ((unsigned1 || unsigned2) \ | |
891 | ? (unsigned long) v1 OP (unsigned long) v2 \ | |
892 | : ((long) v1 OP (long) v2)) ? 1 : 0 | |
893 | ||
894 | /* Parse and evaluate a C expression, reading from PFILE. | |
895 | Returns the value of the expression. */ | |
896 | ||
897 | /*@constant int INIT_STACK_SIZE@*/ | |
898 | # define INIT_STACK_SIZE 20 | |
899 | ||
900 | HOST_WIDE_INT | |
901 | cppReader_parseExpression (cppReader *pfile) | |
902 | { | |
903 | /* The implementation is an operator precedence parser, | |
904 | i.e. a bottom-up parser, using a stack for not-yet-reduced tokens. | |
905 | ||
906 | The stack base is 'stack', and the current stack pointer is 'top'. | |
907 | There is a stack element for each operator (only), | |
908 | and the most recently pushed operator is 'top->op'. | |
909 | An operand (value) is stored in the 'value' field of the stack | |
910 | element of the operator that precedes it. | |
911 | In that case the 'flags' field has the HAVE_VALUE flag set. */ | |
912 | ||
913 | struct operation init_stack[INIT_STACK_SIZE]; | |
914 | struct operation *stack = init_stack; | |
915 | struct operation *limit = stack + INIT_STACK_SIZE; | |
916 | register struct operation *top = stack; | |
917 | int lprio, rprio = 0; | |
918 | int skip_evaluation = 0; | |
919 | ||
920 | top->rprio = 0; | |
921 | top->flags = 0; | |
922 | ||
923 | for (;;) | |
924 | { | |
925 | struct operation op; | |
926 | int flags = 0; | |
927 | ||
928 | /* Read a token */ | |
3e3ec469 | 929 | op = cppexp_lex (pfile); |
616915dd | 930 | |
931 | /* See if the token is an operand, in which case go to set_value. | |
932 | If the token is an operator, figure out its left and right | |
933 | priorities, and then goto maybe_reduce. */ | |
934 | ||
935 | switch (op.op) | |
936 | { | |
937 | case NAME: | |
938 | top->value = 0, top->unsignedp = FALSE; | |
939 | goto set_value; | |
940 | case CPPEXP_INT: | |
941 | case CPPEXP_CHAR: | |
942 | top->value = op.value; | |
943 | top->unsignedp = op.unsignedp; | |
944 | goto set_value; | |
945 | case 0: | |
946 | lprio = 0; goto maybe_reduce; | |
947 | case '+': case '-': | |
948 | /* Is this correct if unary ? FIXME */ | |
949 | flags = RIGHT_OPERAND_REQUIRED; | |
950 | lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce; | |
951 | case '!': case '~': | |
952 | flags = RIGHT_OPERAND_REQUIRED; | |
953 | rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce; | |
954 | case '*': case '/': case '%': | |
955 | lprio = MUL_PRIO; goto binop; | |
956 | case '<': case '>': case LEQ: case GEQ: | |
957 | lprio = LESS_PRIO; goto binop; | |
958 | case CPP_EQUALTOK: case NOTEQUAL: | |
959 | lprio = CPP_EQUAL_PRIO; goto binop; | |
960 | case LSH: case RSH: | |
961 | lprio = SHIFT_PRIO; goto binop; | |
962 | case '&': lprio = AND_PRIO; goto binop; | |
963 | case '^': lprio = XOR_PRIO; goto binop; | |
964 | case '|': lprio = OR_PRIO; goto binop; | |
965 | case ANDAND: lprio = ANDAND_PRIO; goto binop; | |
966 | case OROR: lprio = OROR_PRIO; goto binop; | |
967 | case ',': | |
968 | lprio = COMMA_PRIO; goto binop; | |
969 | case '(': | |
970 | lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO; | |
971 | goto maybe_reduce; | |
972 | case ')': | |
973 | lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO; | |
974 | goto maybe_reduce; | |
975 | case ':': | |
976 | lprio = COND_PRIO; rprio = COND_PRIO; | |
977 | goto maybe_reduce; | |
978 | case '?': | |
979 | lprio = COND_PRIO + 1; rprio = COND_PRIO; | |
980 | goto maybe_reduce; | |
981 | binop: | |
982 | flags = LEFT_OPERAND_REQUIRED | RIGHT_OPERAND_REQUIRED; | |
983 | rprio = lprio + 1; | |
984 | goto maybe_reduce; | |
985 | default: | |
986 | cppReader_error | |
987 | (pfile, | |
988 | message ("Invalid character in #if: %c", | |
989 | (char) op.op)); | |
990 | goto syntax_error; | |
991 | } | |
992 | ||
993 | set_value: | |
994 | /* Push a value onto the stack. */ | |
995 | if ((top->flags & HAVE_VALUE) != 0) | |
996 | { | |
997 | cppReader_errorLit (pfile, | |
80489f0a | 998 | cstring_makeLiteralTemp ("syntax error in #if")); |
616915dd | 999 | goto syntax_error; |
1000 | } | |
1001 | top->flags |= HAVE_VALUE; | |
1002 | continue; | |
1003 | ||
1004 | maybe_reduce: | |
1005 | /* Push an operator, and check if we can reduce now. */ | |
1006 | while (top->rprio > lprio) | |
1007 | { | |
1008 | /*@-usedef@*/ | |
2f2892c2 | 1009 | HOST_WIDE_INT v1 = top[-1].value; |
1010 | HOST_WIDE_INT v2 = top[0].value; | |
616915dd | 1011 | bool unsigned1 = top[-1].unsignedp; |
1012 | bool unsigned2 = top[0].unsignedp; | |
1013 | ||
1014 | top--; | |
1015 | ||
1016 | if (((top[1].flags & LEFT_OPERAND_REQUIRED) != 0) | |
1017 | && ((top[0].flags & HAVE_VALUE) == 0)) | |
1018 | { | |
1019 | cppReader_errorLit (pfile, | |
80489f0a | 1020 | cstring_makeLiteralTemp ("syntax error - missing left operand")); |
616915dd | 1021 | goto syntax_error; |
1022 | } | |
1023 | if (((top[1].flags & RIGHT_OPERAND_REQUIRED) != 0) | |
1024 | && ((top[1].flags & HAVE_VALUE) == 0)) | |
1025 | { | |
1026 | cppReader_errorLit (pfile, | |
80489f0a | 1027 | cstring_makeLiteralTemp ("syntax error - missing right operand")); |
616915dd | 1028 | goto syntax_error; |
1029 | } | |
1030 | /* top[0].value = (top[1].op)(v1, v2);*/ | |
1031 | switch (top[1].op) | |
1032 | { | |
1033 | case '+': | |
1034 | if ((top->flags & HAVE_VALUE) == 0) | |
1035 | { /* Unary '+' */ | |
1036 | top->value = v2; | |
1037 | top->unsignedp = unsigned2; | |
1038 | top->flags |= HAVE_VALUE; | |
1039 | } | |
1040 | else | |
1041 | { | |
1042 | top->value = v1 + v2; | |
1043 | top->unsignedp = unsigned1 || unsigned2; | |
1044 | if (!top->unsignedp && (skip_evaluation == 0) | |
1045 | && ! possibleSumSign (v1, v2, top->value)) | |
1046 | integer_overflow (pfile); | |
1047 | } | |
1048 | /*@switchbreak@*/ break; | |
1049 | case '-': | |
1050 | if ((top->flags & HAVE_VALUE) == 0) | |
1051 | { /* Unary '-' */ | |
1052 | top->value = - v2; | |
1053 | if ((skip_evaluation == 0) | |
1054 | && (top->value & v2) < 0 && !unsigned2) | |
1055 | integer_overflow (pfile); | |
1056 | top->unsignedp = unsigned2; | |
1057 | top->flags |= HAVE_VALUE; | |
1058 | } | |
1059 | else | |
1060 | { /* Binary '-' */ | |
1061 | top->value = v1 - v2; | |
1062 | top->unsignedp = unsigned1 || unsigned2; | |
1063 | if (!top->unsignedp && (skip_evaluation == 0) | |
1064 | && !possibleSumSign (top->value, v2, v1)) | |
1065 | { | |
1066 | integer_overflow (pfile); | |
1067 | } | |
1068 | } | |
1069 | /*@switchbreak@*/ break; | |
1070 | case '*': | |
1071 | top->unsignedp = unsigned1 || unsigned2; | |
1072 | ||
1073 | if (top->unsignedp) | |
1074 | { | |
1075 | top->value = (unsigned long) v1 * v2; | |
1076 | } | |
1077 | else if (skip_evaluation == 0) | |
1078 | { | |
1079 | top->value = v1 * v2; | |
1080 | if ((v1 != 0) | |
1081 | && (top->value / v1 != v2 | |
1082 | || (top->value & v1 & v2) < 0)) | |
1083 | { | |
1084 | integer_overflow (pfile); | |
1085 | } | |
1086 | } | |
1087 | else | |
1088 | { | |
1089 | ; | |
1090 | } | |
1091 | ||
1092 | /*@switchbreak@*/ break; | |
1093 | case '/': | |
1094 | if (skip_evaluation != 0) | |
1095 | /*@switchbreak@*/ break; | |
1096 | if (v2 == 0) | |
1097 | { | |
1098 | cppReader_errorLit (pfile, | |
80489f0a | 1099 | cstring_makeLiteralTemp ("Division by zero in #if")); |
616915dd | 1100 | v2 = 1; |
1101 | } | |
1102 | top->unsignedp = unsigned1 || unsigned2; | |
1103 | if (top->unsignedp) | |
1104 | top->value = (unsigned long) v1 / v2; | |
1105 | else | |
1106 | { | |
1107 | top->value = v1 / v2; | |
1108 | if ((top->value & v1 & v2) < 0) | |
1109 | integer_overflow (pfile); | |
1110 | } | |
1111 | /*@switchbreak@*/ break; | |
1112 | case '%': | |
1113 | if (skip_evaluation != 0) | |
1114 | /*@switchbreak@*/ break; | |
1115 | if (v2 == 0) | |
1116 | { | |
1117 | cppReader_errorLit (pfile, | |
80489f0a | 1118 | cstring_makeLiteralTemp ("Division by zero in #if")); |
616915dd | 1119 | v2 = 1; |
1120 | } | |
1121 | top->unsignedp = unsigned1 || unsigned2; | |
1122 | if (top->unsignedp) | |
1123 | top->value = (unsigned long) v1 % v2; | |
1124 | else | |
1125 | top->value = v1 % v2; | |
1126 | /*@switchbreak@*/ break; | |
1127 | case '!': | |
1128 | if ((top->flags & HAVE_VALUE) != 0) | |
1129 | { | |
1130 | cppReader_errorLit (pfile, | |
1131 | cstring_makeLiteralTemp ("Syntax error")); | |
1132 | goto syntax_error; | |
1133 | } | |
1134 | ||
1135 | top->value = (v2 == 0) ? 1 : 0; | |
1136 | top->unsignedp = FALSE; | |
1137 | top->flags |= HAVE_VALUE; | |
1138 | /*@switchbreak@*/ break; | |
1139 | case '~': | |
1140 | if ((top->flags & HAVE_VALUE) != 0) | |
1141 | { | |
1142 | cppReader_errorLit (pfile, | |
80489f0a | 1143 | cstring_makeLiteralTemp ("syntax error")); |
616915dd | 1144 | goto syntax_error; |
1145 | } | |
1146 | top->value = ~ v2; | |
1147 | top->unsignedp = unsigned2; | |
1148 | top->flags |= HAVE_VALUE; | |
1149 | /*@switchbreak@*/ break; | |
1150 | case '<': COMPARE(<); /*@switchbreak@*/ break; | |
1151 | case '>': COMPARE(>); /*@switchbreak@*/ break; | |
1152 | case LEQ: COMPARE(<=); /*@switchbreak@*/ break; | |
1153 | case GEQ: COMPARE(>=); /*@switchbreak@*/ break; | |
1154 | case CPP_EQUALTOK: | |
1155 | top->value = (v1 == v2) ? 1 : 0; | |
1156 | top->unsignedp = FALSE; | |
1157 | /*@switchbreak@*/ break; | |
1158 | case NOTEQUAL: | |
1159 | top->value = (v1 != v2) ? 1 : 0; | |
1160 | top->unsignedp = FALSE; | |
1161 | /*@switchbreak@*/ break; | |
1162 | case LSH: | |
1163 | if (skip_evaluation != 0) | |
1164 | { | |
1165 | /*@switchbreak@*/ break; | |
1166 | } | |
1167 | ||
1168 | top->unsignedp = unsigned1; | |
1169 | if (v2 < 0 && ! unsigned2) | |
1170 | top->value = right_shift (v1, unsigned1, -v2); | |
1171 | else | |
1172 | top->value = left_shift (pfile, v1, unsigned1, v2); | |
1173 | /*@switchbreak@*/ break; | |
1174 | case RSH: | |
1175 | if (skip_evaluation != 0) | |
1176 | { | |
1177 | /*@switchbreak@*/ break; | |
1178 | } | |
1179 | top->unsignedp = unsigned1; | |
1180 | if (v2 < 0 && ! unsigned2) | |
1181 | top->value = left_shift (pfile, v1, unsigned1, -v2); | |
1182 | else | |
1183 | top->value = right_shift (v1, unsigned1, v2); | |
1184 | /*@switchbreak@*/ break; | |
1185 | ||
1186 | /*@notfunction@*/ | |
1187 | #define LOGICAL(OP) \ | |
1188 | top->value = v1 OP v2;\ | |
1189 | top->unsignedp = unsigned1 || unsigned2; | |
1190 | ||
1191 | case '&': LOGICAL(&); /*@switchbreak@*/ break; | |
1192 | case '^': LOGICAL(^); /*@switchbreak@*/ break; | |
1193 | case '|': LOGICAL(|); /*@switchbreak@*/ break; | |
1194 | case ANDAND: | |
1195 | top->value = ((v1 != 0) && (v2 != 0)) ? 1 : 0; | |
1196 | top->unsignedp = FALSE; | |
1197 | ||
1198 | if (v1 == 0) | |
1199 | { | |
1200 | skip_evaluation--; | |
1201 | } | |
1202 | /*@switchbreak@*/ break; | |
1203 | case OROR: | |
1204 | top->value = ((v1 != 0) || (v2 != 0)) ? 1 : 0; | |
1205 | top->unsignedp = FALSE; | |
1206 | if (v1 != 0) | |
1207 | { | |
1208 | skip_evaluation--; | |
1209 | } | |
1210 | /*@switchbreak@*/ break; | |
1211 | case ',': | |
1212 | if (cppReader_isPedantic (pfile)) | |
1213 | cppReader_pedwarnLit (pfile, | |
1214 | cstring_makeLiteralTemp ("comma operator in operand of `#if'")); | |
1215 | top->value = v2; | |
1216 | top->unsignedp = unsigned2; | |
1217 | /*@switchbreak@*/ break; | |
1218 | case '(': case '?': | |
1219 | cppReader_errorLit (pfile, | |
80489f0a | 1220 | cstring_makeLiteralTemp ("syntax error in #if")); |
616915dd | 1221 | goto syntax_error; |
1222 | case ':': | |
1223 | if (top[0].op != '?') | |
1224 | { | |
1225 | cppReader_errorLit (pfile, | |
80489f0a | 1226 | cstring_makeLiteralTemp ("syntax error ':' without preceding '?'")); |
616915dd | 1227 | goto syntax_error; |
1228 | } | |
1229 | else if (((top[1].flags & HAVE_VALUE) == 0) | |
1230 | || ((top[-1].flags & HAVE_VALUE) == 0) | |
1231 | || ((top[0].flags & HAVE_VALUE) == 0)) | |
1232 | { | |
1233 | cppReader_errorLit (pfile, | |
80489f0a | 1234 | cstring_makeLiteralTemp ("bad syntax for ?: operator")); |
616915dd | 1235 | goto syntax_error; |
1236 | } | |
1237 | else | |
1238 | { | |
1239 | top--; | |
1240 | if (top->value != 0) | |
1241 | { | |
1242 | skip_evaluation--; | |
1243 | } | |
1244 | ||
1245 | top->value = (top->value != 0) ? v1 : v2; | |
1246 | top->unsignedp = unsigned1 || unsigned2; | |
1247 | } | |
1248 | /*@switchbreak@*/ break; | |
1249 | case ')': | |
1250 | if (((top[1].flags & HAVE_VALUE) != 0) | |
1251 | || ((top[0].flags & HAVE_VALUE) == 0) | |
1252 | || top[0].op != '(' | |
1253 | || ((top[-1].flags & HAVE_VALUE) != 0)) | |
1254 | { | |
1255 | cppReader_errorLit (pfile, | |
80489f0a | 1256 | cstring_makeLiteralTemp ("mismatched parentheses in #if")); |
616915dd | 1257 | goto syntax_error; |
1258 | } | |
1259 | else | |
1260 | { | |
1261 | top--; | |
1262 | top->value = v1; | |
1263 | top->unsignedp = unsigned1; | |
1264 | top->flags |= HAVE_VALUE; | |
1265 | } | |
1266 | /*@switchbreak@*/ break; | |
1267 | default: | |
28bf4b0b | 1268 | /*@-formatconst@*/ |
616915dd | 1269 | fprintf (stderr, |
1270 | top[1].op >= ' ' && top[1].op <= '~' | |
1271 | ? "unimplemented operator '%c'\n" | |
1272 | : "unimplemented operator '\\%03o'\n", | |
1273 | top[1].op); | |
28bf4b0b | 1274 | /*@=formatconst@*/ |
616915dd | 1275 | } |
1276 | } | |
1277 | if (op.op == 0) | |
1278 | { | |
1279 | long val; | |
1280 | ||
1281 | if (top != stack) | |
1282 | { | |
1283 | cppReader_errorLit (pfile, | |
80489f0a | 1284 | cstring_makeLiteralTemp ("internal error in #if expression")); |
616915dd | 1285 | } |
1286 | ||
1287 | val = top->value; | |
1288 | ||
1289 | if (stack != init_stack) | |
1290 | { | |
1291 | sfree (stack); | |
1292 | /*@-branchstate@*/ | |
1293 | } /*@=branchstate@*/ | |
1294 | ||
1295 | return val; | |
1296 | } | |
1297 | top++; | |
1298 | ||
1299 | /* Check for and handle stack overflow. */ | |
1300 | if (top == limit) | |
1301 | { | |
1302 | struct operation *new_stack; | |
2f2892c2 | 1303 | size_t old_size = size_fromInt ((char *) limit - (char *) stack); |
53306cab | 1304 | size_t new_size = (size_t) (2 * old_size); |
616915dd | 1305 | |
1306 | if (stack != init_stack) | |
1307 | { | |
1308 | new_stack = (struct operation *) drealloc ((char *) stack, | |
1309 | new_size); | |
1310 | } | |
1311 | else | |
1312 | { | |
1313 | new_stack = (struct operation *) dmalloc (new_size); | |
1314 | ||
1315 | /* Bug: the parameters were in the wrong order! */ | |
1316 | memcpy ((char *) new_stack, (char *) stack, old_size); | |
1317 | /*@-branchstate@*/ | |
1318 | } /*@=branchstate@*/ | |
1319 | ||
1320 | stack = new_stack; | |
1321 | top = (struct operation *) ((char *) new_stack + old_size); | |
1322 | limit = (struct operation *) ((char *) new_stack + new_size); | |
1323 | /*@-branchstate@*/ | |
1324 | } /*@=branchstate@*/ | |
1325 | ||
1326 | top->flags = flags; | |
1327 | top->rprio = rprio; | |
1328 | top->op = op.op; | |
1329 | if ((op.op == OROR && (top[-1].value != 0)) | |
1330 | || (op.op == ANDAND && (top[-1].value == 0)) | |
1331 | || (op.op == '?' && (top[-1].value == 0))) | |
1332 | { | |
1333 | skip_evaluation++; | |
1334 | } | |
1335 | else if (op.op == ':') | |
1336 | { | |
1337 | if (top[-2].value != 0) /* Was condition true? */ | |
1338 | { | |
1339 | skip_evaluation++; | |
1340 | } | |
1341 | else | |
1342 | { | |
1343 | skip_evaluation--; | |
1344 | } | |
1345 | } | |
1346 | else | |
1347 | { | |
1348 | ; | |
1349 | } | |
1350 | } | |
1351 | syntax_error: | |
1352 | /*@-usereleased@*/ | |
1353 | if (stack != init_stack) | |
1354 | { | |
1355 | sfree (stack); | |
1356 | /*@-branchstate@*/ | |
1357 | } /*@=branchstate@*/ | |
1358 | /*@=usereleased@*/ | |
1359 | ||
1360 | cppReader_skipRestOfLine (pfile); | |
1361 | return 0; | |
1362 | } |