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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" |
616915dd | 60 | # include "llbasic.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 | { | |
86d93ed3 | 279 | /*@i3434*/ |
280 | /* drl: see if there is a reason that we shouldn't do | |
281 | p++; | |
282 | len--; */ | |
283 | ||
616915dd | 284 | base = 8; |
285 | } | |
286 | else | |
287 | { | |
288 | ; | |
289 | } | |
290 | ||
291 | /* Some buggy compilers (e.g. MPW C) seem to need both casts. */ | |
292 | ULONG_MAX_over_base = ((unsigned long) -1) / ((unsigned long) base); | |
293 | ||
294 | for (; len > 0; len--) { | |
295 | c = *p++; | |
296 | ||
297 | if (c >= '0' && c <= '9') | |
298 | { | |
299 | digit = (int) (c - '0'); | |
300 | } | |
301 | else if (base == 16 && c >= 'a' && c <= 'f') | |
302 | { | |
303 | digit = (int) (c - 'a') + 10; | |
304 | } | |
305 | else if (base == 16 && c >= 'A' && c <= 'F') | |
306 | { | |
307 | digit = (int) (c - 'A') + 10; | |
308 | } | |
309 | else | |
310 | { | |
311 | /* `l' means long, and `u' means unsigned. */ | |
312 | while (TRUE) | |
313 | { | |
314 | if (c == 'l' || c == 'L') | |
315 | { | |
316 | if (spec_long) | |
317 | cppReader_errorLit (pfile, | |
318 | cstring_makeLiteralTemp ("two `l's in integer constant")); | |
319 | spec_long = TRUE; | |
320 | } | |
321 | else if (c == 'u' || c == 'U') | |
322 | { | |
323 | if (op.unsignedp) | |
324 | cppReader_errorLit (pfile, | |
325 | cstring_makeLiteralTemp ("two `u's in integer constant")); | |
326 | op.unsignedp = TRUE; | |
327 | } | |
328 | else | |
329 | { | |
330 | /*@innerbreak@*/ break; | |
331 | } | |
332 | ||
333 | if (--len == 0) | |
334 | { | |
335 | /*@innerbreak@*/ break; | |
336 | } | |
337 | ||
8fd556fb | 338 | c = *p++; |
616915dd | 339 | } |
340 | /* Don't look for any more digits after the suffixes. */ | |
341 | break; | |
342 | } | |
343 | ||
344 | if (largest_digit < digit) | |
345 | { | |
346 | largest_digit = digit; | |
347 | } | |
348 | ||
349 | nd = (long unsigned) (n * base + digit); | |
350 | overflow |= (ULONG_MAX_over_base < (unsigned long) n) | |
351 | | (nd < (unsigned long) n); | |
352 | n = (long) nd; | |
353 | } | |
354 | ||
355 | if (len != 0) | |
356 | { | |
357 | cppReader_errorLit | |
358 | (pfile, | |
359 | cstring_makeLiteralTemp ("Invalid number in #if expression")); | |
360 | op.op = CPPREADER_ERRORTOK; | |
361 | return op; | |
362 | } | |
363 | ||
364 | if (base <= largest_digit) | |
365 | { | |
366 | cppReader_pedwarnLit | |
367 | (pfile, | |
368 | cstring_makeLiteralTemp | |
369 | ("Integer constant contains digits beyond the radix")); | |
370 | } | |
371 | ||
372 | if (overflow) | |
373 | { | |
28bf4b0b | 374 | /*@i23 add flags for all these...*/ |
616915dd | 375 | cppReader_pedwarnLit |
376 | (pfile, | |
377 | cstring_makeLiteralTemp ("Integer constant out of range")); | |
378 | } | |
379 | ||
380 | /* If too big to be signed, consider it unsigned. */ | |
381 | if ((long) n < 0 && ! op.unsignedp) | |
382 | { | |
383 | if (base == 10) | |
384 | { | |
385 | cppReader_warningLit | |
386 | (pfile, | |
387 | cstring_makeLiteralTemp ("Integer constant is so large that it is unsigned")); | |
388 | } | |
389 | ||
390 | op.unsignedp = TRUE; | |
391 | } | |
392 | ||
393 | op.value = n; | |
394 | op.op = CPPEXP_INT; | |
3e3ec469 | 395 | DPRINTF (("Parse number: %d", op.value)); |
616915dd | 396 | return op; |
397 | } | |
398 | ||
399 | struct token { | |
400 | /*@null@*/ /*@observer@*/ char *operator; | |
401 | int token; | |
402 | }; | |
403 | ||
404 | static struct token tokentab2[] = { | |
405 | { "&&", ANDAND }, | |
406 | { "||", OROR }, | |
407 | { "<<", LSH }, | |
408 | { ">>", RSH }, | |
409 | { "==", CPP_EQUALTOK }, | |
410 | { "!=", NOTEQUAL }, | |
411 | { "<=", LEQ }, | |
412 | { ">=", GEQ }, | |
413 | { "++", CPPREADER_ERRORTOK }, | |
414 | { "--", CPPREADER_ERRORTOK }, | |
415 | { NULL, CPPREADER_ERRORTOK } | |
416 | } ; | |
417 | ||
418 | /* Read one token. */ | |
419 | ||
3e3ec469 | 420 | struct operation cppexp_lex (cppReader *pfile) |
616915dd | 421 | { |
422 | int ic; | |
423 | char c; | |
424 | register struct token *toktab; | |
425 | enum cpp_token token; | |
426 | struct operation op; | |
427 | char *tok_start, *tok_end; | |
428 | int old_written; | |
429 | ||
430 | retry: | |
3e3ec469 | 431 | |
432 | old_written = size_toInt (cpplib_getWritten (pfile)); | |
616915dd | 433 | cppSkipHspace (pfile); |
3e3ec469 | 434 | ic = cpplib_bufPeek (cppReader_getBufferSafe (pfile)); |
616915dd | 435 | |
436 | c = (char) ic; | |
abd7f895 | 437 | |
438 | if (c == '#') | |
439 | { | |
440 | /* was: llassert (c != '#'); - Solaris uses this, attempt to continue anyway... */ | |
441 | cppReader_pedwarn (pfile, | |
442 | message ("non-standard pre-processor directive: %c", c)); | |
443 | } | |
444 | ||
3e3ec469 | 445 | DPRINTF (("Read: %c", c)); |
446 | ||
616915dd | 447 | if (c == '\n') |
448 | { | |
449 | op.op = 0; | |
450 | return op; | |
451 | } | |
452 | ||
3e3ec469 | 453 | token = cpplib_getTokenForceExpand (pfile); |
454 | ||
616915dd | 455 | tok_start = pfile->token_buffer + old_written; |
3e3ec469 | 456 | tok_end = cpplib_getPWritten (pfile); |
457 | ||
458 | DPRINTF (("Token: %s < %s", tok_start, tok_end)); | |
459 | ||
616915dd | 460 | pfile->limit = tok_start; |
461 | ||
462 | switch (token) | |
3e3ec469 | 463 | { |
616915dd | 464 | case CPP_EOF: /* Should not happen ... */ |
465 | case CPP_VSPACE: | |
466 | op.op = 0; | |
467 | return op; | |
468 | case CPP_POP: | |
469 | if (cstring_isDefined (cppReader_getBufferSafe (pfile)->fname)) | |
470 | { | |
471 | op.op = 0; | |
472 | return op; | |
473 | } | |
474 | (void) cppReader_popBuffer (pfile); | |
475 | goto retry; | |
476 | case CPP_HSPACE: case CPP_COMMENT: | |
477 | goto retry; | |
478 | case CPP_NUMBER: | |
479 | return cppReader_parseNumber (pfile, tok_start, tok_end - tok_start); | |
480 | case CPP_STRING: | |
481 | cppReader_errorLit (pfile, | |
3e3ec469 | 482 | cstring_makeLiteralTemp ("string constants not allowed in #if expressions")); |
616915dd | 483 | op.op = CPPREADER_ERRORTOK; |
484 | return op; | |
485 | case CPP_CHAR: | |
486 | /* This code for reading a character constant | |
487 | handles multicharacter constants and wide characters. | |
488 | It is mostly copied from c-lex.c. */ | |
489 | { | |
490 | int result = 0; | |
491 | int num_chars = 0; | |
492 | size_t width = MAX_CHAR_TYPE_SIZE; | |
493 | int wide_flag = 0; | |
494 | int max_chars; | |
495 | char *ptr = tok_start; | |
496 | #ifdef MULTIBYTE_CHARS | |
497 | char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + MB_CUR_MAX]; | |
498 | #else | |
499 | char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1]; | |
500 | #endif | |
3e3ec469 | 501 | |
616915dd | 502 | if (*ptr == 'L') |
503 | { | |
504 | ptr++; | |
505 | wide_flag = 1; | |
506 | width = MAX_WCHAR_TYPE_SIZE; | |
507 | #ifdef MULTIBYTE_CHARS | |
508 | max_chars = MB_CUR_MAX; | |
509 | #else | |
510 | max_chars = 1; | |
511 | #endif | |
512 | } | |
513 | else | |
514 | { | |
515 | max_chars = size_toInt (MAX_LONG_TYPE_SIZE / width); | |
516 | } | |
3e3ec469 | 517 | |
616915dd | 518 | ++ptr; |
8fd556fb | 519 | while (ptr < tok_end && ((c = *ptr++) != '\'')) |
616915dd | 520 | { |
521 | if (c == '\\') | |
522 | { | |
523 | c = cppReader_parseEscape (pfile, &ptr); | |
524 | if (width < HOST_BITS_PER_INT && c >= (1 << width)) | |
525 | { | |
526 | cppReader_pedwarnLit | |
527 | (pfile, | |
528 | cstring_makeLiteralTemp ("Escape sequence out of range for character")); | |
529 | } | |
530 | } | |
531 | ||
532 | num_chars++; | |
533 | ||
534 | /* Merge character into result; ignore excess chars. */ | |
535 | if (num_chars < max_chars + 1) | |
536 | { | |
537 | if (width < HOST_BITS_PER_INT) | |
538 | { | |
539 | result = (int) ((unsigned) result << width) | (c & ((1 << width) - 1)); | |
540 | } | |
541 | else | |
542 | { | |
543 | result = c; | |
544 | } | |
545 | ||
546 | token_buffer[num_chars - 1] = c; | |
547 | } | |
548 | } | |
549 | ||
8fd556fb | 550 | token_buffer[num_chars] = 0; |
616915dd | 551 | |
552 | if (c != '\'') | |
553 | cppReader_errorLit (pfile, | |
80489f0a | 554 | cstring_makeLiteralTemp ("malformatted character constant")); |
616915dd | 555 | else if (num_chars == 0) |
556 | cppReader_errorLit (pfile, | |
80489f0a | 557 | cstring_makeLiteralTemp ("empty character constant")); |
616915dd | 558 | else if (num_chars > max_chars) |
559 | { | |
560 | num_chars = max_chars; | |
561 | cppReader_errorLit (pfile, | |
80489f0a | 562 | cstring_makeLiteralTemp ("character constant too long")); |
616915dd | 563 | } |
564 | else if (num_chars != 1 && ! cppReader_isTraditional (pfile)) | |
565 | { | |
566 | cppReader_warningLit (pfile, | |
80489f0a | 567 | cstring_makeLiteralTemp ("multi-character character constant")); |
616915dd | 568 | } |
569 | else | |
570 | { | |
571 | ; | |
572 | } | |
573 | ||
574 | /* If char type is signed, sign-extend the constant. */ | |
575 | if (wide_flag == 0) | |
576 | { | |
577 | int num_bits = num_chars * width; | |
578 | ||
3e3ec469 | 579 | if ((cpphash_lookup ("__CHAR_UNSIGNED__", |
616915dd | 580 | sizeof ("__CHAR_UNSIGNED__") - 1, -1) != NULL) |
a956d444 | 581 | || (((unsigned) result >> (int_toNonNegative (num_bits - 1))) & 1) == 0) |
616915dd | 582 | { |
583 | op.value | |
a956d444 | 584 | = result & ((unsigned long) ~0 |
585 | >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits))); | |
616915dd | 586 | } |
587 | else | |
588 | { | |
589 | op.value | |
a956d444 | 590 | = result | ~((unsigned long) ~0 |
591 | >> int_toNonNegative ((HOST_BITS_PER_LONG - num_bits))); | |
616915dd | 592 | } |
593 | } | |
594 | else | |
595 | { | |
596 | #ifdef MULTIBYTE_CHARS | |
597 | /* Set the initial shift state and convert the next sequence. */ | |
598 | result = 0; | |
599 | /* In all locales L'\0' is zero and mbtowc will return zero, | |
600 | so don't use it. */ | |
601 | if (num_chars > 1 | |
602 | || (num_chars == 1 && token_buffer[0] != '\0')) | |
603 | { | |
604 | wchar_t wc; | |
605 | (void) mbtowc (NULL, NULL, 0); | |
606 | if (mbtowc (& wc, token_buffer, num_chars) == num_chars) | |
607 | result = wc; | |
608 | else | |
609 | cppReader_pedwarn (pfile,"Ignoring invalid multibyte character"); | |
610 | } | |
611 | #endif | |
612 | op.value = result; | |
613 | } | |
614 | } | |
615 | ||
616 | /* This is always a signed type. */ | |
617 | op.unsignedp = FALSE; | |
618 | op.op = CPPEXP_CHAR; | |
619 | ||
620 | return op; | |
621 | ||
622 | case CPP_NAME: | |
3e3ec469 | 623 | DPRINTF (("Name!")); |
616915dd | 624 | return cppReader_parseNumber (pfile, "0", 0); |
625 | ||
626 | case CPP_OTHER: | |
627 | /* See if it is a special token of length 2. */ | |
628 | if (tok_start + 2 == tok_end) | |
629 | { | |
630 | for (toktab = tokentab2; toktab->operator != NULL; toktab++) | |
631 | { | |
8fd556fb | 632 | if (tok_start[0] == toktab->operator[0] && |
633 | tok_start[1] == toktab->operator[1]) | |
616915dd | 634 | { |
635 | /*@loopbreak@*/ break; | |
636 | } | |
637 | } | |
638 | ||
639 | if (toktab->token == CPPREADER_ERRORTOK) | |
640 | { | |
80489f0a | 641 | cppReader_error (pfile, |
642 | message ("`%s' not allowed in operand of `#if'", | |
643 | cstring_fromChars (tok_start))); | |
616915dd | 644 | } |
645 | ||
646 | op.op = toktab->token; | |
647 | return op; | |
648 | } | |
649 | /*@fallthrough@*/ | |
650 | default: | |
651 | op.op = *tok_start; | |
652 | return op; | |
653 | } | |
654 | ||
655 | BADEXIT; | |
656 | /*@notreached@*/ | |
657 | } | |
658 | ||
659 | ||
660 | /* Parse a C escape sequence. STRING_PTR points to a variable | |
661 | containing a pointer to the string to parse. That pointer | |
662 | is updated past the characters we use. The value of the | |
663 | escape sequence is returned. | |
664 | ||
665 | A negative value means the sequence \ newline was seen, | |
666 | which is supposed to be equivalent to nothing at all. | |
667 | ||
668 | If \ is followed by a null character, we return a negative | |
669 | value and leave the string pointer pointing at the null character. | |
670 | ||
671 | If \ is followed by 000, we return 0 and leave the string pointer | |
672 | after the zeros. A value of 0 does not mean end of string. */ | |
673 | ||
674 | int | |
675 | cppReader_parseEscape (cppReader *pfile, char **string_ptr) | |
676 | { | |
8fd556fb | 677 | char c = *(*string_ptr)++; |
616915dd | 678 | |
679 | switch (c) | |
680 | { | |
681 | case 'a': | |
682 | return TARGET_BELL; | |
683 | case 'b': | |
684 | return TARGET_BS; | |
685 | case 'e': | |
686 | case 'E': | |
687 | if (cppReader_isPedantic (pfile)) | |
688 | { | |
689 | cppReader_pedwarn (pfile, | |
155af98d | 690 | message ("non-standard escape sequence, `\\%c'", c)); |
616915dd | 691 | } |
692 | return (char) 033; | |
693 | case 'f': | |
694 | return TARGET_FF; | |
695 | case 'n': | |
696 | return TARGET_NEWLINE; | |
697 | case 'r': | |
698 | return TARGET_CR; | |
699 | case 't': | |
700 | return TARGET_TAB; | |
701 | case 'v': | |
702 | return TARGET_VT; | |
703 | case '\n': | |
704 | return -2; | |
705 | case 0: | |
706 | (*string_ptr)--; | |
707 | return 0; | |
708 | ||
709 | case '0': | |
710 | case '1': | |
711 | case '2': | |
712 | case '3': | |
713 | case '4': | |
714 | case '5': | |
715 | case '6': | |
716 | case '7': | |
717 | { | |
718 | int i = (int) c - '0'; | |
719 | int count = 0; | |
720 | ||
721 | while (++count < 3) | |
722 | { | |
723 | c = *(*string_ptr)++; | |
724 | if (c >= '0' && c <= '7') | |
725 | { | |
726 | i = ((unsigned) i << 3) + c - '0'; | |
727 | } | |
728 | ||
729 | else | |
730 | { | |
8fd556fb | 731 | (*string_ptr)--; |
616915dd | 732 | /*@loopbreak@*/ break; |
733 | } | |
734 | } | |
735 | if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0) | |
736 | { | |
737 | i &= (1 << MAX_CHAR_TYPE_SIZE) - 1; | |
738 | cppReader_pedwarnLit (pfile, | |
739 | cstring_makeLiteralTemp ("octal character constant does not fit in a byte")); | |
740 | } | |
741 | return i; | |
742 | } | |
743 | case 'x': | |
744 | { | |
745 | register unsigned i = 0, overflow = 0, digits_found = 0, digit; | |
746 | for (;;) | |
747 | { | |
748 | c = *(*string_ptr)++; | |
749 | ||
750 | if (c >= '0' && c <= '9') | |
751 | { | |
752 | digit = (unsigned int) (c - '0'); | |
753 | } | |
754 | else if (c >= 'a' && c <= 'f') | |
755 | { | |
756 | digit = (unsigned int) (c - 'a') + 10; | |
757 | } | |
758 | else if (c >= 'A' && c <= 'F') | |
759 | { | |
760 | digit = (unsigned int) (c - 'A') + 10; | |
761 | } | |
762 | else | |
763 | { | |
764 | (*string_ptr)--; | |
765 | /*@loopbreak@*/ break; | |
766 | } | |
767 | overflow |= i ^ (i << 4 >> 4); | |
768 | i = (i << 4) + digit; | |
769 | digits_found = 1; | |
770 | } | |
771 | ||
772 | if (digits_found == 0) | |
773 | { | |
774 | cppReader_errorLit (pfile, | |
775 | cstring_makeLiteralTemp ("\\x used with no following hex digits")); | |
776 | } | |
777 | ||
a956d444 | 778 | if ((overflow | (i & ~((1 << int_toNonNegative (BITS_PER_UNIT)) - 1))) != 0) |
616915dd | 779 | { |
780 | i &= (1 << BITS_PER_UNIT) - 1; | |
781 | cppReader_pedwarnLit (pfile, | |
782 | cstring_makeLiteralTemp ("hex character constant does not fit in a byte")); | |
783 | } | |
784 | ||
785 | return i; | |
786 | } | |
787 | default: | |
788 | return c; | |
789 | } | |
790 | } | |
791 | ||
792 | static void | |
793 | integer_overflow (cppReader *pfile) | |
794 | { | |
795 | if (cppReader_isPedantic (pfile)) | |
796 | cppReader_pedwarnLit (pfile, | |
797 | cstring_makeLiteralTemp ("integer overflow in preprocessor expression")); | |
798 | } | |
799 | ||
800 | static long | |
c3be2604 | 801 | left_shift (cppReader *pfile, long a, bool unsignedp, unsigned long b) |
616915dd | 802 | { |
803 | if (b >= HOST_BITS_PER_LONG) | |
804 | { | |
805 | if (!unsignedp && a != 0) | |
806 | { | |
807 | integer_overflow (pfile); | |
808 | } | |
809 | ||
810 | return 0; | |
811 | } | |
812 | else if (unsignedp) | |
813 | { | |
814 | return (unsigned long) a << b; | |
815 | } | |
816 | else | |
817 | { | |
a956d444 | 818 | long l = int_toNonNegative (a) << b; |
4dd72714 | 819 | |
820 | # ifdef WIN32 | |
821 | # pragma warning( disable : 4018 ) | |
822 | # endif | |
823 | ||
a956d444 | 824 | if (int_toNonNegative (l) >> b != a) |
616915dd | 825 | { |
826 | integer_overflow (pfile); | |
827 | } | |
828 | ||
829 | return l; | |
830 | } | |
831 | } | |
832 | ||
833 | static long | |
834 | right_shift (long a, bool unsignedp, unsigned long b) | |
835 | { | |
836 | if (b >= HOST_BITS_PER_LONG) | |
a956d444 | 837 | return (unsignedp ? 0 : int_toNonNegative (a) >> (HOST_BITS_PER_LONG - 1)); |
616915dd | 838 | else if (unsignedp) |
839 | return (unsigned long) a >> b; | |
840 | else | |
a956d444 | 841 | return int_toNonNegative (a) >> b; |
616915dd | 842 | } |
843 | ||
844 | /* These priorities are all even, so we can handle associatively. */ | |
845 | ||
846 | /*@constant int PAREN_INNER_PRIO@*/ | |
847 | #define PAREN_INNER_PRIO 0 | |
848 | ||
849 | /*@constant int COMMA_PRIO@*/ | |
850 | #define COMMA_PRIO 4 | |
851 | ||
852 | /*@constant int COND_PRIO@*/ | |
853 | #define COND_PRIO (COMMA_PRIO+2) | |
854 | ||
855 | /*@constant int OROR_PRIO@*/ | |
856 | #define OROR_PRIO (COND_PRIO+2) | |
857 | ||
858 | /*@constant int ANDAND_PRIO@*/ | |
859 | #define ANDAND_PRIO (OROR_PRIO+2) | |
860 | ||
861 | /*@constant int OR_PRIO@*/ | |
862 | #define OR_PRIO (ANDAND_PRIO+2) | |
863 | ||
864 | /*@constant int XOR_PRIO@*/ | |
865 | #define XOR_PRIO (OR_PRIO+2) | |
866 | ||
867 | /*@constant int AND_PRIO@*/ | |
868 | #define AND_PRIO (XOR_PRIO+2) | |
869 | ||
870 | /*@constant int CPP_EQUAL_PRIO@*/ | |
871 | #define CPP_EQUAL_PRIO (AND_PRIO+2) | |
872 | ||
873 | /*@constant int LESS_PRIO@*/ | |
874 | #define LESS_PRIO (CPP_EQUAL_PRIO+2) | |
875 | ||
876 | /*@constant int SHIFT_PRIO@*/ | |
877 | #define SHIFT_PRIO (LESS_PRIO+2) | |
878 | ||
879 | /*@constant int PLUS_PRIO@*/ | |
880 | #define PLUS_PRIO (SHIFT_PRIO+2) | |
881 | ||
882 | /*@constant int MUL_PRIO@*/ | |
883 | #define MUL_PRIO (PLUS_PRIO+2) | |
884 | ||
885 | /*@constant int UNARY_PRIO@*/ | |
886 | #define UNARY_PRIO (MUL_PRIO+2) | |
887 | ||
888 | /*@constant int PAREN_OUTER_PRIO@*/ | |
889 | #define PAREN_OUTER_PRIO (UNARY_PRIO+2) | |
890 | ||
891 | /*@notfunction@*/ | |
892 | #define COMPARE(OP) \ | |
893 | top->unsignedp = FALSE;\ | |
894 | top->value = ((unsigned1 || unsigned2) \ | |
895 | ? (unsigned long) v1 OP (unsigned long) v2 \ | |
896 | : ((long) v1 OP (long) v2)) ? 1 : 0 | |
897 | ||
898 | /* Parse and evaluate a C expression, reading from PFILE. | |
899 | Returns the value of the expression. */ | |
900 | ||
901 | /*@constant int INIT_STACK_SIZE@*/ | |
902 | # define INIT_STACK_SIZE 20 | |
903 | ||
904 | HOST_WIDE_INT | |
905 | cppReader_parseExpression (cppReader *pfile) | |
906 | { | |
907 | /* The implementation is an operator precedence parser, | |
908 | i.e. a bottom-up parser, using a stack for not-yet-reduced tokens. | |
909 | ||
910 | The stack base is 'stack', and the current stack pointer is 'top'. | |
911 | There is a stack element for each operator (only), | |
912 | and the most recently pushed operator is 'top->op'. | |
913 | An operand (value) is stored in the 'value' field of the stack | |
914 | element of the operator that precedes it. | |
915 | In that case the 'flags' field has the HAVE_VALUE flag set. */ | |
916 | ||
917 | struct operation init_stack[INIT_STACK_SIZE]; | |
918 | struct operation *stack = init_stack; | |
919 | struct operation *limit = stack + INIT_STACK_SIZE; | |
920 | register struct operation *top = stack; | |
921 | int lprio, rprio = 0; | |
922 | int skip_evaluation = 0; | |
923 | ||
924 | top->rprio = 0; | |
925 | top->flags = 0; | |
926 | ||
927 | for (;;) | |
928 | { | |
929 | struct operation op; | |
930 | int flags = 0; | |
931 | ||
932 | /* Read a token */ | |
3e3ec469 | 933 | op = cppexp_lex (pfile); |
616915dd | 934 | |
935 | /* See if the token is an operand, in which case go to set_value. | |
936 | If the token is an operator, figure out its left and right | |
937 | priorities, and then goto maybe_reduce. */ | |
938 | ||
939 | switch (op.op) | |
940 | { | |
941 | case NAME: | |
942 | top->value = 0, top->unsignedp = FALSE; | |
943 | goto set_value; | |
944 | case CPPEXP_INT: | |
945 | case CPPEXP_CHAR: | |
946 | top->value = op.value; | |
947 | top->unsignedp = op.unsignedp; | |
948 | goto set_value; | |
949 | case 0: | |
950 | lprio = 0; goto maybe_reduce; | |
951 | case '+': case '-': | |
952 | /* Is this correct if unary ? FIXME */ | |
953 | flags = RIGHT_OPERAND_REQUIRED; | |
954 | lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce; | |
955 | case '!': case '~': | |
956 | flags = RIGHT_OPERAND_REQUIRED; | |
957 | rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce; | |
958 | case '*': case '/': case '%': | |
959 | lprio = MUL_PRIO; goto binop; | |
960 | case '<': case '>': case LEQ: case GEQ: | |
961 | lprio = LESS_PRIO; goto binop; | |
962 | case CPP_EQUALTOK: case NOTEQUAL: | |
963 | lprio = CPP_EQUAL_PRIO; goto binop; | |
964 | case LSH: case RSH: | |
965 | lprio = SHIFT_PRIO; goto binop; | |
966 | case '&': lprio = AND_PRIO; goto binop; | |
967 | case '^': lprio = XOR_PRIO; goto binop; | |
968 | case '|': lprio = OR_PRIO; goto binop; | |
969 | case ANDAND: lprio = ANDAND_PRIO; goto binop; | |
970 | case OROR: lprio = OROR_PRIO; goto binop; | |
971 | case ',': | |
972 | lprio = COMMA_PRIO; goto binop; | |
973 | case '(': | |
974 | lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO; | |
975 | goto maybe_reduce; | |
976 | case ')': | |
977 | lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO; | |
978 | goto maybe_reduce; | |
979 | case ':': | |
980 | lprio = COND_PRIO; rprio = COND_PRIO; | |
981 | goto maybe_reduce; | |
982 | case '?': | |
983 | lprio = COND_PRIO + 1; rprio = COND_PRIO; | |
984 | goto maybe_reduce; | |
985 | binop: | |
986 | flags = LEFT_OPERAND_REQUIRED | RIGHT_OPERAND_REQUIRED; | |
987 | rprio = lprio + 1; | |
988 | goto maybe_reduce; | |
989 | default: | |
990 | cppReader_error | |
991 | (pfile, | |
992 | message ("Invalid character in #if: %c", | |
993 | (char) op.op)); | |
994 | goto syntax_error; | |
995 | } | |
996 | ||
997 | set_value: | |
998 | /* Push a value onto the stack. */ | |
999 | if ((top->flags & HAVE_VALUE) != 0) | |
1000 | { | |
1001 | cppReader_errorLit (pfile, | |
80489f0a | 1002 | cstring_makeLiteralTemp ("syntax error in #if")); |
616915dd | 1003 | goto syntax_error; |
1004 | } | |
1005 | top->flags |= HAVE_VALUE; | |
1006 | continue; | |
1007 | ||
1008 | maybe_reduce: | |
1009 | /* Push an operator, and check if we can reduce now. */ | |
1010 | while (top->rprio > lprio) | |
1011 | { | |
1012 | /*@-usedef@*/ | |
2f2892c2 | 1013 | HOST_WIDE_INT v1 = top[-1].value; |
1014 | HOST_WIDE_INT v2 = top[0].value; | |
616915dd | 1015 | bool unsigned1 = top[-1].unsignedp; |
1016 | bool unsigned2 = top[0].unsignedp; | |
1017 | ||
1018 | top--; | |
1019 | ||
1020 | if (((top[1].flags & LEFT_OPERAND_REQUIRED) != 0) | |
1021 | && ((top[0].flags & HAVE_VALUE) == 0)) | |
1022 | { | |
1023 | cppReader_errorLit (pfile, | |
80489f0a | 1024 | cstring_makeLiteralTemp ("syntax error - missing left operand")); |
616915dd | 1025 | goto syntax_error; |
1026 | } | |
1027 | if (((top[1].flags & RIGHT_OPERAND_REQUIRED) != 0) | |
1028 | && ((top[1].flags & HAVE_VALUE) == 0)) | |
1029 | { | |
1030 | cppReader_errorLit (pfile, | |
80489f0a | 1031 | cstring_makeLiteralTemp ("syntax error - missing right operand")); |
616915dd | 1032 | goto syntax_error; |
1033 | } | |
1034 | /* top[0].value = (top[1].op)(v1, v2);*/ | |
1035 | switch (top[1].op) | |
1036 | { | |
1037 | case '+': | |
1038 | if ((top->flags & HAVE_VALUE) == 0) | |
1039 | { /* Unary '+' */ | |
1040 | top->value = v2; | |
1041 | top->unsignedp = unsigned2; | |
1042 | top->flags |= HAVE_VALUE; | |
1043 | } | |
1044 | else | |
1045 | { | |
1046 | top->value = v1 + v2; | |
1047 | top->unsignedp = unsigned1 || unsigned2; | |
1048 | if (!top->unsignedp && (skip_evaluation == 0) | |
1049 | && ! possibleSumSign (v1, v2, top->value)) | |
1050 | integer_overflow (pfile); | |
1051 | } | |
1052 | /*@switchbreak@*/ break; | |
1053 | case '-': | |
1054 | if ((top->flags & HAVE_VALUE) == 0) | |
1055 | { /* Unary '-' */ | |
1056 | top->value = - v2; | |
1057 | if ((skip_evaluation == 0) | |
1058 | && (top->value & v2) < 0 && !unsigned2) | |
1059 | integer_overflow (pfile); | |
1060 | top->unsignedp = unsigned2; | |
1061 | top->flags |= HAVE_VALUE; | |
1062 | } | |
1063 | else | |
1064 | { /* Binary '-' */ | |
1065 | top->value = v1 - v2; | |
1066 | top->unsignedp = unsigned1 || unsigned2; | |
1067 | if (!top->unsignedp && (skip_evaluation == 0) | |
1068 | && !possibleSumSign (top->value, v2, v1)) | |
1069 | { | |
1070 | integer_overflow (pfile); | |
1071 | } | |
1072 | } | |
1073 | /*@switchbreak@*/ break; | |
1074 | case '*': | |
1075 | top->unsignedp = unsigned1 || unsigned2; | |
1076 | ||
1077 | if (top->unsignedp) | |
1078 | { | |
1079 | top->value = (unsigned long) v1 * v2; | |
1080 | } | |
1081 | else if (skip_evaluation == 0) | |
1082 | { | |
1083 | top->value = v1 * v2; | |
1084 | if ((v1 != 0) | |
1085 | && (top->value / v1 != v2 | |
1086 | || (top->value & v1 & v2) < 0)) | |
1087 | { | |
1088 | integer_overflow (pfile); | |
1089 | } | |
1090 | } | |
1091 | else | |
1092 | { | |
1093 | ; | |
1094 | } | |
1095 | ||
1096 | /*@switchbreak@*/ break; | |
1097 | case '/': | |
1098 | if (skip_evaluation != 0) | |
1099 | /*@switchbreak@*/ break; | |
1100 | if (v2 == 0) | |
1101 | { | |
1102 | cppReader_errorLit (pfile, | |
80489f0a | 1103 | cstring_makeLiteralTemp ("Division by zero in #if")); |
616915dd | 1104 | v2 = 1; |
1105 | } | |
1106 | top->unsignedp = unsigned1 || unsigned2; | |
1107 | if (top->unsignedp) | |
1108 | top->value = (unsigned long) v1 / v2; | |
1109 | else | |
1110 | { | |
1111 | top->value = v1 / v2; | |
1112 | if ((top->value & v1 & v2) < 0) | |
1113 | integer_overflow (pfile); | |
1114 | } | |
1115 | /*@switchbreak@*/ break; | |
1116 | case '%': | |
1117 | if (skip_evaluation != 0) | |
1118 | /*@switchbreak@*/ break; | |
1119 | if (v2 == 0) | |
1120 | { | |
1121 | cppReader_errorLit (pfile, | |
80489f0a | 1122 | cstring_makeLiteralTemp ("Division by zero in #if")); |
616915dd | 1123 | v2 = 1; |
1124 | } | |
1125 | top->unsignedp = unsigned1 || unsigned2; | |
1126 | if (top->unsignedp) | |
1127 | top->value = (unsigned long) v1 % v2; | |
1128 | else | |
1129 | top->value = v1 % v2; | |
1130 | /*@switchbreak@*/ break; | |
1131 | case '!': | |
1132 | if ((top->flags & HAVE_VALUE) != 0) | |
1133 | { | |
1134 | cppReader_errorLit (pfile, | |
1135 | cstring_makeLiteralTemp ("Syntax error")); | |
1136 | goto syntax_error; | |
1137 | } | |
1138 | ||
1139 | top->value = (v2 == 0) ? 1 : 0; | |
1140 | top->unsignedp = FALSE; | |
1141 | top->flags |= HAVE_VALUE; | |
1142 | /*@switchbreak@*/ break; | |
1143 | case '~': | |
1144 | if ((top->flags & HAVE_VALUE) != 0) | |
1145 | { | |
1146 | cppReader_errorLit (pfile, | |
80489f0a | 1147 | cstring_makeLiteralTemp ("syntax error")); |
616915dd | 1148 | goto syntax_error; |
1149 | } | |
1150 | top->value = ~ v2; | |
1151 | top->unsignedp = unsigned2; | |
1152 | top->flags |= HAVE_VALUE; | |
1153 | /*@switchbreak@*/ break; | |
1154 | case '<': COMPARE(<); /*@switchbreak@*/ break; | |
1155 | case '>': COMPARE(>); /*@switchbreak@*/ break; | |
1156 | case LEQ: COMPARE(<=); /*@switchbreak@*/ break; | |
1157 | case GEQ: COMPARE(>=); /*@switchbreak@*/ break; | |
1158 | case CPP_EQUALTOK: | |
1159 | top->value = (v1 == v2) ? 1 : 0; | |
1160 | top->unsignedp = FALSE; | |
1161 | /*@switchbreak@*/ break; | |
1162 | case NOTEQUAL: | |
1163 | top->value = (v1 != v2) ? 1 : 0; | |
1164 | top->unsignedp = FALSE; | |
1165 | /*@switchbreak@*/ break; | |
1166 | case LSH: | |
1167 | if (skip_evaluation != 0) | |
1168 | { | |
1169 | /*@switchbreak@*/ break; | |
1170 | } | |
1171 | ||
1172 | top->unsignedp = unsigned1; | |
1173 | if (v2 < 0 && ! unsigned2) | |
1174 | top->value = right_shift (v1, unsigned1, -v2); | |
1175 | else | |
1176 | top->value = left_shift (pfile, v1, unsigned1, v2); | |
1177 | /*@switchbreak@*/ break; | |
1178 | case RSH: | |
1179 | if (skip_evaluation != 0) | |
1180 | { | |
1181 | /*@switchbreak@*/ break; | |
1182 | } | |
1183 | top->unsignedp = unsigned1; | |
1184 | if (v2 < 0 && ! unsigned2) | |
1185 | top->value = left_shift (pfile, v1, unsigned1, -v2); | |
1186 | else | |
1187 | top->value = right_shift (v1, unsigned1, v2); | |
1188 | /*@switchbreak@*/ break; | |
1189 | ||
1190 | /*@notfunction@*/ | |
1191 | #define LOGICAL(OP) \ | |
1192 | top->value = v1 OP v2;\ | |
1193 | top->unsignedp = unsigned1 || unsigned2; | |
1194 | ||
1195 | case '&': LOGICAL(&); /*@switchbreak@*/ break; | |
1196 | case '^': LOGICAL(^); /*@switchbreak@*/ break; | |
1197 | case '|': LOGICAL(|); /*@switchbreak@*/ break; | |
1198 | case ANDAND: | |
1199 | top->value = ((v1 != 0) && (v2 != 0)) ? 1 : 0; | |
1200 | top->unsignedp = FALSE; | |
1201 | ||
1202 | if (v1 == 0) | |
1203 | { | |
1204 | skip_evaluation--; | |
1205 | } | |
1206 | /*@switchbreak@*/ break; | |
1207 | case OROR: | |
1208 | top->value = ((v1 != 0) || (v2 != 0)) ? 1 : 0; | |
1209 | top->unsignedp = FALSE; | |
1210 | if (v1 != 0) | |
1211 | { | |
1212 | skip_evaluation--; | |
1213 | } | |
1214 | /*@switchbreak@*/ break; | |
1215 | case ',': | |
1216 | if (cppReader_isPedantic (pfile)) | |
1217 | cppReader_pedwarnLit (pfile, | |
1218 | cstring_makeLiteralTemp ("comma operator in operand of `#if'")); | |
1219 | top->value = v2; | |
1220 | top->unsignedp = unsigned2; | |
1221 | /*@switchbreak@*/ break; | |
1222 | case '(': case '?': | |
1223 | cppReader_errorLit (pfile, | |
80489f0a | 1224 | cstring_makeLiteralTemp ("syntax error in #if")); |
616915dd | 1225 | goto syntax_error; |
1226 | case ':': | |
1227 | if (top[0].op != '?') | |
1228 | { | |
1229 | cppReader_errorLit (pfile, | |
80489f0a | 1230 | cstring_makeLiteralTemp ("syntax error ':' without preceding '?'")); |
616915dd | 1231 | goto syntax_error; |
1232 | } | |
1233 | else if (((top[1].flags & HAVE_VALUE) == 0) | |
1234 | || ((top[-1].flags & HAVE_VALUE) == 0) | |
1235 | || ((top[0].flags & HAVE_VALUE) == 0)) | |
1236 | { | |
1237 | cppReader_errorLit (pfile, | |
80489f0a | 1238 | cstring_makeLiteralTemp ("bad syntax for ?: operator")); |
616915dd | 1239 | goto syntax_error; |
1240 | } | |
1241 | else | |
1242 | { | |
1243 | top--; | |
1244 | if (top->value != 0) | |
1245 | { | |
1246 | skip_evaluation--; | |
1247 | } | |
1248 | ||
1249 | top->value = (top->value != 0) ? v1 : v2; | |
1250 | top->unsignedp = unsigned1 || unsigned2; | |
1251 | } | |
1252 | /*@switchbreak@*/ break; | |
1253 | case ')': | |
1254 | if (((top[1].flags & HAVE_VALUE) != 0) | |
1255 | || ((top[0].flags & HAVE_VALUE) == 0) | |
1256 | || top[0].op != '(' | |
1257 | || ((top[-1].flags & HAVE_VALUE) != 0)) | |
1258 | { | |
1259 | cppReader_errorLit (pfile, | |
80489f0a | 1260 | cstring_makeLiteralTemp ("mismatched parentheses in #if")); |
616915dd | 1261 | goto syntax_error; |
1262 | } | |
1263 | else | |
1264 | { | |
1265 | top--; | |
1266 | top->value = v1; | |
1267 | top->unsignedp = unsigned1; | |
1268 | top->flags |= HAVE_VALUE; | |
1269 | } | |
1270 | /*@switchbreak@*/ break; | |
1271 | default: | |
28bf4b0b | 1272 | /*@-formatconst@*/ |
616915dd | 1273 | fprintf (stderr, |
1274 | top[1].op >= ' ' && top[1].op <= '~' | |
1275 | ? "unimplemented operator '%c'\n" | |
1276 | : "unimplemented operator '\\%03o'\n", | |
1277 | top[1].op); | |
28bf4b0b | 1278 | /*@=formatconst@*/ |
616915dd | 1279 | } |
1280 | } | |
1281 | if (op.op == 0) | |
1282 | { | |
1283 | long val; | |
1284 | ||
1285 | if (top != stack) | |
1286 | { | |
1287 | cppReader_errorLit (pfile, | |
80489f0a | 1288 | cstring_makeLiteralTemp ("internal error in #if expression")); |
616915dd | 1289 | } |
1290 | ||
1291 | val = top->value; | |
1292 | ||
1293 | if (stack != init_stack) | |
1294 | { | |
1295 | sfree (stack); | |
1296 | /*@-branchstate@*/ | |
1297 | } /*@=branchstate@*/ | |
1298 | ||
1299 | return val; | |
1300 | } | |
1301 | top++; | |
1302 | ||
1303 | /* Check for and handle stack overflow. */ | |
1304 | if (top == limit) | |
1305 | { | |
1306 | struct operation *new_stack; | |
2f2892c2 | 1307 | size_t old_size = size_fromInt ((char *) limit - (char *) stack); |
53306cab | 1308 | size_t new_size = (size_t) (2 * old_size); |
616915dd | 1309 | |
1310 | if (stack != init_stack) | |
1311 | { | |
1312 | new_stack = (struct operation *) drealloc ((char *) stack, | |
1313 | new_size); | |
1314 | } | |
1315 | else | |
1316 | { | |
1317 | new_stack = (struct operation *) dmalloc (new_size); | |
1318 | ||
1319 | /* Bug: the parameters were in the wrong order! */ | |
1320 | memcpy ((char *) new_stack, (char *) stack, old_size); | |
1321 | /*@-branchstate@*/ | |
1322 | } /*@=branchstate@*/ | |
1323 | ||
1324 | stack = new_stack; | |
1325 | top = (struct operation *) ((char *) new_stack + old_size); | |
1326 | limit = (struct operation *) ((char *) new_stack + new_size); | |
1327 | /*@-branchstate@*/ | |
1328 | } /*@=branchstate@*/ | |
1329 | ||
1330 | top->flags = flags; | |
1331 | top->rprio = rprio; | |
1332 | top->op = op.op; | |
1333 | if ((op.op == OROR && (top[-1].value != 0)) | |
1334 | || (op.op == ANDAND && (top[-1].value == 0)) | |
1335 | || (op.op == '?' && (top[-1].value == 0))) | |
1336 | { | |
1337 | skip_evaluation++; | |
1338 | } | |
1339 | else if (op.op == ':') | |
1340 | { | |
1341 | if (top[-2].value != 0) /* Was condition true? */ | |
1342 | { | |
1343 | skip_evaluation++; | |
1344 | } | |
1345 | else | |
1346 | { | |
1347 | skip_evaluation--; | |
1348 | } | |
1349 | } | |
1350 | else | |
1351 | { | |
1352 | ; | |
1353 | } | |
1354 | } | |
1355 | syntax_error: | |
1356 | /*@-usereleased@*/ | |
1357 | if (stack != init_stack) | |
1358 | { | |
1359 | sfree (stack); | |
1360 | /*@-branchstate@*/ | |
1361 | } /*@=branchstate@*/ | |
1362 | /*@=usereleased@*/ | |
1363 | ||
1364 | cppReader_skipRestOfLine (pfile); | |
1365 | return 0; | |
1366 | } |