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616915dd | 1 | /* |
11db3170 | 2 | ** Splint - annotation-assisted static program checker |
77d37419 | 3 | ** Copyright (C) 1994-2002 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 | ** | |
20 | ** For information on lclint: lclint-request@cs.virginia.edu | |
21 | ** To report a bug: lclint-bug@cs.virginia.edu | |
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@*/ | |
57 | /*@-shiftsigned@*/ | |
58 | ||
59 | # include <string.h> | |
60 | # include "lclintMacros.nf" | |
61 | # include "llbasic.h" | |
616915dd | 62 | # include "cpplib.h" |
63 | # include "cpphash.h" | |
64 | # include "cppexp.h" | |
65 | # include "cpperror.h" | |
66 | ||
67 | /* Yield nonzero if adding two numbers with A's and B's signs can yield a | |
68 | number with SUM's sign, where A, B, and SUM are all C integers. */ | |
69 | ||
70 | /*@function static bool possibleSumSign (sef int, int, int) | |
71 | modifies nothing ; @*/ | |
72 | ||
73 | #define possibleSumSign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0) | |
74 | ||
75 | /* these are guesses! */ | |
76 | ||
77 | /*@constant int BITS_PER_UNIT@*/ | |
78 | # define BITS_PER_UNIT 8 | |
79 | ||
80 | /*@constant size_t BITS_PER_CHAR@*/ | |
81 | # define BITS_PER_CHAR 8 | |
82 | ||
83 | /*@constant size_t BITS_PER_WORD@*/ | |
84 | # define BITS_PER_WORD 32 | |
85 | ||
86 | /*@constant size_t HOST_BITS_PER_INT@*/ | |
87 | # define HOST_BITS_PER_INT 32 | |
88 | ||
89 | /*@constant size_t HOST_BITS_PER_LONG@*/ | |
90 | # define HOST_BITS_PER_LONG 32 | |
91 | ||
92 | /*@constant char TARGET_BELL@*/ | |
93 | # define TARGET_BELL (char) 6 | |
94 | ||
95 | /*@constant char TARGET_BS@*/ | |
96 | # define TARGET_BS (char) 7 | |
97 | ||
98 | /*@constant char TARGET_FF@*/ | |
99 | # define TARGET_FF (char) 8 | |
100 | ||
101 | /*@constant char TARGET_NEWLINE@*/ | |
102 | # define TARGET_NEWLINE '\n' | |
103 | ||
104 | /*@constant char TARGET_CR@*/ | |
105 | # define TARGET_CR '\n' | |
106 | ||
107 | /*@constant char TARGET_TAB@*/ | |
108 | # define TARGET_TAB '\t' | |
109 | ||
110 | /*@constant char TARGET_VT@*/ | |
111 | # define TARGET_VT '\v' | |
112 | ||
113 | #ifdef MULTIBYTE_CHARS | |
114 | #include <stdlib.h> | |
115 | #include <locale.h> | |
116 | #endif | |
117 | ||
118 | #include <stdio.h> | |
119 | ||
120 | #ifndef INT_TYPE_SIZE | |
121 | /*@constant size_t INT_TYPE_SIZE@*/ | |
122 | #define INT_TYPE_SIZE BITS_PER_WORD | |
123 | #endif | |
124 | ||
125 | #ifndef LONG_TYPE_SIZE | |
126 | /*@constant size_t LONG_TYPE_SIZE@*/ | |
127 | #define LONG_TYPE_SIZE BITS_PER_WORD | |
128 | #endif | |
129 | ||
130 | #ifndef WCHAR_TYPE_SIZE | |
131 | /*@constant size_t WCHAR_TYPE_SIZE@*/ | |
132 | #define WCHAR_TYPE_SIZE INT_TYPE_SIZE | |
133 | #endif | |
134 | ||
135 | # ifndef CHAR_TYPE_SIZE | |
136 | /*@constant size_t CHAR_TYPE_SIZE@*/ | |
137 | # define CHAR_TYPE_SIZE BITS_PER_CHAR | |
138 | # endif | |
139 | ||
140 | #ifndef MAX_CHAR_TYPE_SIZE | |
141 | /*@constant size_t MAX_CHAR_TYPE_SIZE@*/ | |
142 | #define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE | |
143 | #endif | |
144 | ||
145 | #ifndef MAX_LONG_TYPE_SIZE | |
146 | /*@constant size_t MAX_LONG_TYPE_SIZE@*/ | |
147 | #define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE | |
148 | #endif | |
149 | ||
150 | #ifndef MAX_WCHAR_TYPE_SIZE | |
151 | /*@constant size_t MAX_WCHAR_TYPE_SIZE@*/ | |
152 | #define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE | |
153 | #endif | |
154 | ||
3e3ec469 | 155 | static struct operation cppexp_lex (cppReader *); |
616915dd | 156 | static void integer_overflow (cppReader *); |
157 | static long left_shift (cppReader *, long, bool p_unsignedp, size_t); | |
158 | static long right_shift (long, bool p_unsignedp, unsigned long); | |
159 | ||
160 | /*@constant short CPPREADER_ERRORTOK@*/ | |
161 | #define CPPREADER_ERRORTOK 299 | |
162 | ||
163 | /*@constant int OROR@*/ | |
164 | #define OROR 300 | |
165 | ||
166 | /*@constant int ANDAND@*/ | |
167 | #define ANDAND 301 | |
168 | ||
169 | /*@constant int CPP_EQUALTOK@*/ | |
170 | #define CPP_EQUALTOK 302 | |
171 | ||
172 | /*@constant int NOTEQUAL@*/ | |
173 | #define NOTEQUAL 303 | |
174 | ||
175 | /*@constant int LEQ@*/ | |
176 | #define LEQ 304 | |
177 | ||
178 | /*@constant int GEQ@*/ | |
179 | #define GEQ 305 | |
180 | ||
181 | /*@constant int LSH@*/ | |
182 | #define LSH 306 | |
183 | ||
184 | /*@constant int RSH@*/ | |
185 | #define RSH 307 | |
186 | ||
187 | /*@constant int NAME@*/ | |
188 | #define NAME 308 | |
189 | ||
190 | /*@constant short CPPEXP_INT@*/ | |
191 | #define CPPEXP_INT 309 | |
192 | ||
193 | /*@constant short CPPEXP_CHAR@*/ | |
194 | #define CPPEXP_CHAR 310 | |
195 | ||
196 | /*@constant int LEFT_OPERAND_REQUIRED@*/ | |
197 | #define LEFT_OPERAND_REQUIRED 1 | |
198 | ||
199 | /*@constant int RIGHT_OPERAND_REQUIRED@*/ | |
200 | #define RIGHT_OPERAND_REQUIRED 2 | |
201 | ||
202 | /*@constant int HAVE_VALUE@*/ | |
203 | #define HAVE_VALUE 4 | |
204 | ||
205 | #ifndef HOST_BITS_PER_WIDE_INT | |
206 | ||
207 | #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT | |
208 | /*@constant int HOST_BITS_PER_WIDE_INT@*/ | |
209 | #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG | |
210 | /*@notfunction@*/ | |
211 | #define HOST_WIDE_INT long | |
212 | #else | |
213 | /*@constant int HOST_BITS_PER_WIDE_INT@*/ | |
214 | #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT | |
215 | /*@notfunction@*/ | |
216 | #define HOST_WIDE_INT long | |
217 | #endif | |
218 | ||
219 | #endif | |
220 | ||
221 | struct operation { | |
222 | short op; | |
223 | ||
224 | /* Priority of op (relative to it right operand). */ | |
225 | /*@reldef@*/ char rprio; | |
226 | ||
227 | /*@reldef@*/ char flags; | |
228 | ||
229 | /* true if value should be treated as unsigned */ | |
230 | /*@reldef@*/ bool unsignedp; | |
231 | ||
232 | /* The value logically "right" of op. */ | |
233 | /*@reldef@*/ HOST_WIDE_INT value; | |
234 | } ; | |
235 | ||
236 | /* Take care of parsing a number (anything that starts with a digit). | |
237 | LEN is the number of characters in it. */ | |
238 | ||
239 | /* maybe needs to actually deal with floating point numbers */ | |
240 | ||
241 | struct operation | |
242 | cppReader_parseNumber (cppReader *pfile, char *start, int olen) | |
243 | { | |
244 | struct operation op; | |
245 | char *p = start; | |
246 | char c; | |
247 | int i; | |
248 | long n = 0; | |
249 | unsigned long nd, ULONG_MAX_over_base; | |
250 | int base = 10; | |
251 | int len = olen; | |
252 | bool overflow = FALSE; | |
253 | int digit, largest_digit = 0; | |
254 | bool spec_long = FALSE; | |
255 | ||
256 | op.unsignedp = FALSE; | |
257 | ||
258 | for (i = 0; i < len; i++) | |
259 | { | |
260 | if (p[i] == '.') { | |
261 | /* It's a float since it contains a point. */ | |
262 | cppReader_errorLit | |
263 | (pfile, | |
264 | cstring_makeLiteralTemp | |
265 | ("Floating point numbers not allowed in #if expressions")); | |
266 | op.op = CPPREADER_ERRORTOK; | |
267 | return op; | |
268 | } | |
269 | } | |
270 | ||
271 | if (len >= 3 && (mstring_equalPrefix (p, "0x") | |
272 | || mstring_equalPrefix (p, "0X"))) | |
273 | { | |
274 | p += 2; | |
275 | base = 16; | |
276 | len -= 2; | |
277 | } | |
278 | else if (*p == '0') | |
279 | { | |
280 | base = 8; | |
281 | } | |
282 | else | |
283 | { | |
284 | ; | |
285 | } | |
286 | ||
287 | /* Some buggy compilers (e.g. MPW C) seem to need both casts. */ | |
288 | ULONG_MAX_over_base = ((unsigned long) -1) / ((unsigned long) base); | |
289 | ||
290 | for (; len > 0; len--) { | |
291 | c = *p++; | |
292 | ||
293 | if (c >= '0' && c <= '9') | |
294 | { | |
295 | digit = (int) (c - '0'); | |
296 | } | |
297 | else if (base == 16 && c >= 'a' && c <= 'f') | |
298 | { | |
299 | digit = (int) (c - 'a') + 10; | |
300 | } | |
301 | else if (base == 16 && c >= 'A' && c <= 'F') | |
302 | { | |
303 | digit = (int) (c - 'A') + 10; | |
304 | } | |
305 | else | |
306 | { | |
307 | /* `l' means long, and `u' means unsigned. */ | |
308 | while (TRUE) | |
309 | { | |
310 | if (c == 'l' || c == 'L') | |
311 | { | |
312 | if (spec_long) | |
313 | cppReader_errorLit (pfile, | |
314 | cstring_makeLiteralTemp ("two `l's in integer constant")); | |
315 | spec_long = TRUE; | |
316 | } | |
317 | else if (c == 'u' || c == 'U') | |
318 | { | |
319 | if (op.unsignedp) | |
320 | cppReader_errorLit (pfile, | |
321 | cstring_makeLiteralTemp ("two `u's in integer constant")); | |
322 | op.unsignedp = TRUE; | |
323 | } | |
324 | else | |
325 | { | |
326 | /*@innerbreak@*/ break; | |
327 | } | |
328 | ||
329 | if (--len == 0) | |
330 | { | |
331 | /*@innerbreak@*/ break; | |
332 | } | |
333 | ||
334 | c = *p++; | |
335 | } | |
336 | /* Don't look for any more digits after the suffixes. */ | |
337 | break; | |
338 | } | |
339 | ||
340 | if (largest_digit < digit) | |
341 | { | |
342 | largest_digit = digit; | |
343 | } | |
344 | ||
345 | nd = (long unsigned) (n * base + digit); | |
346 | overflow |= (ULONG_MAX_over_base < (unsigned long) n) | |
347 | | (nd < (unsigned long) n); | |
348 | n = (long) nd; | |
349 | } | |
350 | ||
351 | if (len != 0) | |
352 | { | |
353 | cppReader_errorLit | |
354 | (pfile, | |
355 | cstring_makeLiteralTemp ("Invalid number in #if expression")); | |
356 | op.op = CPPREADER_ERRORTOK; | |
357 | return op; | |
358 | } | |
359 | ||
360 | if (base <= largest_digit) | |
361 | { | |
362 | cppReader_pedwarnLit | |
363 | (pfile, | |
364 | cstring_makeLiteralTemp | |
365 | ("Integer constant contains digits beyond the radix")); | |
366 | } | |
367 | ||
368 | if (overflow) | |
369 | { | |
28bf4b0b | 370 | /*@i23 add flags for all these...*/ |
616915dd | 371 | cppReader_pedwarnLit |
372 | (pfile, | |
373 | cstring_makeLiteralTemp ("Integer constant out of range")); | |
374 | } | |
375 | ||
376 | /* If too big to be signed, consider it unsigned. */ | |
377 | if ((long) n < 0 && ! op.unsignedp) | |
378 | { | |
379 | if (base == 10) | |
380 | { | |
381 | cppReader_warningLit | |
382 | (pfile, | |
383 | cstring_makeLiteralTemp ("Integer constant is so large that it is unsigned")); | |
384 | } | |
385 | ||
386 | op.unsignedp = TRUE; | |
387 | } | |
388 | ||
389 | op.value = n; | |
390 | op.op = CPPEXP_INT; | |
3e3ec469 | 391 | DPRINTF (("Parse number: %d", op.value)); |
616915dd | 392 | return op; |
393 | } | |
394 | ||
395 | struct token { | |
396 | /*@null@*/ /*@observer@*/ char *operator; | |
397 | int token; | |
398 | }; | |
399 | ||
400 | static struct token tokentab2[] = { | |
401 | { "&&", ANDAND }, | |
402 | { "||", OROR }, | |
403 | { "<<", LSH }, | |
404 | { ">>", RSH }, | |
405 | { "==", CPP_EQUALTOK }, | |
406 | { "!=", NOTEQUAL }, | |
407 | { "<=", LEQ }, | |
408 | { ">=", GEQ }, | |
409 | { "++", CPPREADER_ERRORTOK }, | |
410 | { "--", CPPREADER_ERRORTOK }, | |
411 | { NULL, CPPREADER_ERRORTOK } | |
412 | } ; | |
413 | ||
414 | /* Read one token. */ | |
415 | ||
3e3ec469 | 416 | struct operation cppexp_lex (cppReader *pfile) |
616915dd | 417 | { |
418 | int ic; | |
419 | char c; | |
420 | register struct token *toktab; | |
421 | enum cpp_token token; | |
422 | struct operation op; | |
423 | char *tok_start, *tok_end; | |
424 | int old_written; | |
425 | ||
426 | retry: | |
3e3ec469 | 427 | |
428 | old_written = size_toInt (cpplib_getWritten (pfile)); | |
616915dd | 429 | cppSkipHspace (pfile); |
3e3ec469 | 430 | ic = cpplib_bufPeek (cppReader_getBufferSafe (pfile)); |
616915dd | 431 | |
432 | c = (char) ic; | |
433 | llassert (c != '#'); | |
3e3ec469 | 434 | DPRINTF (("Read: %c", c)); |
435 | ||
616915dd | 436 | if (c == '\n') |
437 | { | |
438 | op.op = 0; | |
439 | return op; | |
440 | } | |
441 | ||
3e3ec469 | 442 | token = cpplib_getTokenForceExpand (pfile); |
443 | ||
616915dd | 444 | tok_start = pfile->token_buffer + old_written; |
3e3ec469 | 445 | tok_end = cpplib_getPWritten (pfile); |
446 | ||
447 | DPRINTF (("Token: %s < %s", tok_start, tok_end)); | |
448 | ||
616915dd | 449 | pfile->limit = tok_start; |
450 | ||
451 | switch (token) | |
3e3ec469 | 452 | { |
616915dd | 453 | case CPP_EOF: /* Should not happen ... */ |
454 | case CPP_VSPACE: | |
455 | op.op = 0; | |
456 | return op; | |
457 | case CPP_POP: | |
458 | if (cstring_isDefined (cppReader_getBufferSafe (pfile)->fname)) | |
459 | { | |
460 | op.op = 0; | |
461 | return op; | |
462 | } | |
463 | (void) cppReader_popBuffer (pfile); | |
464 | goto retry; | |
465 | case CPP_HSPACE: case CPP_COMMENT: | |
466 | goto retry; | |
467 | case CPP_NUMBER: | |
468 | return cppReader_parseNumber (pfile, tok_start, tok_end - tok_start); | |
469 | case CPP_STRING: | |
470 | cppReader_errorLit (pfile, | |
3e3ec469 | 471 | cstring_makeLiteralTemp ("string constants not allowed in #if expressions")); |
616915dd | 472 | op.op = CPPREADER_ERRORTOK; |
473 | return op; | |
474 | case CPP_CHAR: | |
475 | /* This code for reading a character constant | |
476 | handles multicharacter constants and wide characters. | |
477 | It is mostly copied from c-lex.c. */ | |
478 | { | |
479 | int result = 0; | |
480 | int num_chars = 0; | |
481 | size_t width = MAX_CHAR_TYPE_SIZE; | |
482 | int wide_flag = 0; | |
483 | int max_chars; | |
484 | char *ptr = tok_start; | |
485 | #ifdef MULTIBYTE_CHARS | |
486 | char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + MB_CUR_MAX]; | |
487 | #else | |
488 | char token_buffer[MAX_LONG_TYPE_SIZE/MAX_CHAR_TYPE_SIZE + 1]; | |
489 | #endif | |
3e3ec469 | 490 | |
616915dd | 491 | if (*ptr == 'L') |
492 | { | |
493 | ptr++; | |
494 | wide_flag = 1; | |
495 | width = MAX_WCHAR_TYPE_SIZE; | |
496 | #ifdef MULTIBYTE_CHARS | |
497 | max_chars = MB_CUR_MAX; | |
498 | #else | |
499 | max_chars = 1; | |
500 | #endif | |
501 | } | |
502 | else | |
503 | { | |
504 | max_chars = size_toInt (MAX_LONG_TYPE_SIZE / width); | |
505 | } | |
3e3ec469 | 506 | |
616915dd | 507 | ++ptr; |
508 | while (ptr < tok_end && ((c = *ptr++) != '\'')) | |
509 | { | |
510 | if (c == '\\') | |
511 | { | |
512 | c = cppReader_parseEscape (pfile, &ptr); | |
513 | if (width < HOST_BITS_PER_INT && c >= (1 << width)) | |
514 | { | |
515 | cppReader_pedwarnLit | |
516 | (pfile, | |
517 | cstring_makeLiteralTemp ("Escape sequence out of range for character")); | |
518 | } | |
519 | } | |
520 | ||
521 | num_chars++; | |
522 | ||
523 | /* Merge character into result; ignore excess chars. */ | |
524 | if (num_chars < max_chars + 1) | |
525 | { | |
526 | if (width < HOST_BITS_PER_INT) | |
527 | { | |
528 | result = (int) ((unsigned) result << width) | (c & ((1 << width) - 1)); | |
529 | } | |
530 | else | |
531 | { | |
532 | result = c; | |
533 | } | |
534 | ||
535 | token_buffer[num_chars - 1] = c; | |
536 | } | |
537 | } | |
538 | ||
539 | token_buffer[num_chars] = 0; | |
540 | ||
541 | if (c != '\'') | |
542 | cppReader_errorLit (pfile, | |
543 | cstring_makeLiteralTemp ("malformatted character constant")); | |
544 | else if (num_chars == 0) | |
545 | cppReader_errorLit (pfile, | |
546 | cstring_makeLiteralTemp ("empty character constant")); | |
547 | else if (num_chars > max_chars) | |
548 | { | |
549 | num_chars = max_chars; | |
550 | cppReader_errorLit (pfile, | |
551 | cstring_makeLiteralTemp ("character constant too long")); | |
552 | } | |
553 | else if (num_chars != 1 && ! cppReader_isTraditional (pfile)) | |
554 | { | |
555 | cppReader_warningLit (pfile, | |
556 | cstring_makeLiteralTemp ("multi-character character constant")); | |
557 | } | |
558 | else | |
559 | { | |
560 | ; | |
561 | } | |
562 | ||
563 | /* If char type is signed, sign-extend the constant. */ | |
564 | if (wide_flag == 0) | |
565 | { | |
566 | int num_bits = num_chars * width; | |
567 | ||
3e3ec469 | 568 | if ((cpphash_lookup ("__CHAR_UNSIGNED__", |
616915dd | 569 | sizeof ("__CHAR_UNSIGNED__") - 1, -1) != NULL) |
570 | || (((unsigned) result >> (num_bits - 1)) & 1) == 0) | |
571 | { | |
572 | op.value | |
573 | = result & ((unsigned long) ~0 >> (HOST_BITS_PER_LONG - num_bits)); | |
574 | } | |
575 | else | |
576 | { | |
577 | op.value | |
578 | = result | ~((unsigned long) ~0 >> (HOST_BITS_PER_LONG - num_bits)); | |
579 | } | |
580 | } | |
581 | else | |
582 | { | |
583 | #ifdef MULTIBYTE_CHARS | |
584 | /* Set the initial shift state and convert the next sequence. */ | |
585 | result = 0; | |
586 | /* In all locales L'\0' is zero and mbtowc will return zero, | |
587 | so don't use it. */ | |
588 | if (num_chars > 1 | |
589 | || (num_chars == 1 && token_buffer[0] != '\0')) | |
590 | { | |
591 | wchar_t wc; | |
592 | (void) mbtowc (NULL, NULL, 0); | |
593 | if (mbtowc (& wc, token_buffer, num_chars) == num_chars) | |
594 | result = wc; | |
595 | else | |
596 | cppReader_pedwarn (pfile,"Ignoring invalid multibyte character"); | |
597 | } | |
598 | #endif | |
599 | op.value = result; | |
600 | } | |
601 | } | |
602 | ||
603 | /* This is always a signed type. */ | |
604 | op.unsignedp = FALSE; | |
605 | op.op = CPPEXP_CHAR; | |
606 | ||
607 | return op; | |
608 | ||
609 | case CPP_NAME: | |
3e3ec469 | 610 | DPRINTF (("Name!")); |
616915dd | 611 | return cppReader_parseNumber (pfile, "0", 0); |
612 | ||
613 | case CPP_OTHER: | |
614 | /* See if it is a special token of length 2. */ | |
615 | if (tok_start + 2 == tok_end) | |
616 | { | |
617 | for (toktab = tokentab2; toktab->operator != NULL; toktab++) | |
618 | { | |
619 | if (tok_start[0] == toktab->operator[0] | |
620 | && tok_start[1] == toktab->operator[1]) | |
621 | { | |
622 | /*@loopbreak@*/ break; | |
623 | } | |
624 | } | |
625 | ||
626 | if (toktab->token == CPPREADER_ERRORTOK) | |
627 | { | |
628 | cppReader_error (pfile, message ("`%s' not allowed in operand of `#if'", cstring_fromChars (tok_start))); | |
629 | } | |
630 | ||
631 | op.op = toktab->token; | |
632 | return op; | |
633 | } | |
634 | /*@fallthrough@*/ | |
635 | default: | |
636 | op.op = *tok_start; | |
637 | return op; | |
638 | } | |
639 | ||
640 | BADEXIT; | |
641 | /*@notreached@*/ | |
642 | } | |
643 | ||
644 | ||
645 | /* Parse a C escape sequence. STRING_PTR points to a variable | |
646 | containing a pointer to the string to parse. That pointer | |
647 | is updated past the characters we use. The value of the | |
648 | escape sequence is returned. | |
649 | ||
650 | A negative value means the sequence \ newline was seen, | |
651 | which is supposed to be equivalent to nothing at all. | |
652 | ||
653 | If \ is followed by a null character, we return a negative | |
654 | value and leave the string pointer pointing at the null character. | |
655 | ||
656 | If \ is followed by 000, we return 0 and leave the string pointer | |
657 | after the zeros. A value of 0 does not mean end of string. */ | |
658 | ||
659 | int | |
660 | cppReader_parseEscape (cppReader *pfile, char **string_ptr) | |
661 | { | |
662 | char c = *(*string_ptr)++; | |
663 | ||
664 | switch (c) | |
665 | { | |
666 | case 'a': | |
667 | return TARGET_BELL; | |
668 | case 'b': | |
669 | return TARGET_BS; | |
670 | case 'e': | |
671 | case 'E': | |
672 | if (cppReader_isPedantic (pfile)) | |
673 | { | |
674 | cppReader_pedwarn (pfile, | |
675 | message ("non-ANSI-standard escape sequence, `\\%c'", c)); | |
676 | } | |
677 | return (char) 033; | |
678 | case 'f': | |
679 | return TARGET_FF; | |
680 | case 'n': | |
681 | return TARGET_NEWLINE; | |
682 | case 'r': | |
683 | return TARGET_CR; | |
684 | case 't': | |
685 | return TARGET_TAB; | |
686 | case 'v': | |
687 | return TARGET_VT; | |
688 | case '\n': | |
689 | return -2; | |
690 | case 0: | |
691 | (*string_ptr)--; | |
692 | return 0; | |
693 | ||
694 | case '0': | |
695 | case '1': | |
696 | case '2': | |
697 | case '3': | |
698 | case '4': | |
699 | case '5': | |
700 | case '6': | |
701 | case '7': | |
702 | { | |
703 | int i = (int) c - '0'; | |
704 | int count = 0; | |
705 | ||
706 | while (++count < 3) | |
707 | { | |
708 | c = *(*string_ptr)++; | |
709 | if (c >= '0' && c <= '7') | |
710 | { | |
711 | i = ((unsigned) i << 3) + c - '0'; | |
712 | } | |
713 | ||
714 | else | |
715 | { | |
716 | (*string_ptr)--; | |
717 | /*@loopbreak@*/ break; | |
718 | } | |
719 | } | |
720 | if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0) | |
721 | { | |
722 | i &= (1 << MAX_CHAR_TYPE_SIZE) - 1; | |
723 | cppReader_pedwarnLit (pfile, | |
724 | cstring_makeLiteralTemp ("octal character constant does not fit in a byte")); | |
725 | } | |
726 | return i; | |
727 | } | |
728 | case 'x': | |
729 | { | |
730 | register unsigned i = 0, overflow = 0, digits_found = 0, digit; | |
731 | for (;;) | |
732 | { | |
733 | c = *(*string_ptr)++; | |
734 | ||
735 | if (c >= '0' && c <= '9') | |
736 | { | |
737 | digit = (unsigned int) (c - '0'); | |
738 | } | |
739 | else if (c >= 'a' && c <= 'f') | |
740 | { | |
741 | digit = (unsigned int) (c - 'a') + 10; | |
742 | } | |
743 | else if (c >= 'A' && c <= 'F') | |
744 | { | |
745 | digit = (unsigned int) (c - 'A') + 10; | |
746 | } | |
747 | else | |
748 | { | |
749 | (*string_ptr)--; | |
750 | /*@loopbreak@*/ break; | |
751 | } | |
752 | overflow |= i ^ (i << 4 >> 4); | |
753 | i = (i << 4) + digit; | |
754 | digits_found = 1; | |
755 | } | |
756 | ||
757 | if (digits_found == 0) | |
758 | { | |
759 | cppReader_errorLit (pfile, | |
760 | cstring_makeLiteralTemp ("\\x used with no following hex digits")); | |
761 | } | |
762 | ||
763 | if ((overflow | (i & ~((1 << BITS_PER_UNIT) - 1))) != 0) | |
764 | { | |
765 | i &= (1 << BITS_PER_UNIT) - 1; | |
766 | cppReader_pedwarnLit (pfile, | |
767 | cstring_makeLiteralTemp ("hex character constant does not fit in a byte")); | |
768 | } | |
769 | ||
770 | return i; | |
771 | } | |
772 | default: | |
773 | return c; | |
774 | } | |
775 | } | |
776 | ||
777 | static void | |
778 | integer_overflow (cppReader *pfile) | |
779 | { | |
780 | if (cppReader_isPedantic (pfile)) | |
781 | cppReader_pedwarnLit (pfile, | |
782 | cstring_makeLiteralTemp ("integer overflow in preprocessor expression")); | |
783 | } | |
784 | ||
785 | static long | |
786 | left_shift (cppReader *pfile, long a, bool unsignedp, size_t b) | |
787 | { | |
788 | if (b >= HOST_BITS_PER_LONG) | |
789 | { | |
790 | if (!unsignedp && a != 0) | |
791 | { | |
792 | integer_overflow (pfile); | |
793 | } | |
794 | ||
795 | return 0; | |
796 | } | |
797 | else if (unsignedp) | |
798 | { | |
799 | return (unsigned long) a << b; | |
800 | } | |
801 | else | |
802 | { | |
803 | long l = a << b; | |
804 | ||
805 | if (l >> b != a) | |
806 | { | |
807 | integer_overflow (pfile); | |
808 | } | |
809 | ||
810 | return l; | |
811 | } | |
812 | } | |
813 | ||
814 | static long | |
815 | right_shift (long a, bool unsignedp, unsigned long b) | |
816 | { | |
817 | if (b >= HOST_BITS_PER_LONG) | |
818 | return (unsignedp ? 0 : a >> (HOST_BITS_PER_LONG - 1)); | |
819 | else if (unsignedp) | |
820 | return (unsigned long) a >> b; | |
821 | else | |
822 | return a >> b; | |
823 | } | |
824 | ||
825 | /* These priorities are all even, so we can handle associatively. */ | |
826 | ||
827 | /*@constant int PAREN_INNER_PRIO@*/ | |
828 | #define PAREN_INNER_PRIO 0 | |
829 | ||
830 | /*@constant int COMMA_PRIO@*/ | |
831 | #define COMMA_PRIO 4 | |
832 | ||
833 | /*@constant int COND_PRIO@*/ | |
834 | #define COND_PRIO (COMMA_PRIO+2) | |
835 | ||
836 | /*@constant int OROR_PRIO@*/ | |
837 | #define OROR_PRIO (COND_PRIO+2) | |
838 | ||
839 | /*@constant int ANDAND_PRIO@*/ | |
840 | #define ANDAND_PRIO (OROR_PRIO+2) | |
841 | ||
842 | /*@constant int OR_PRIO@*/ | |
843 | #define OR_PRIO (ANDAND_PRIO+2) | |
844 | ||
845 | /*@constant int XOR_PRIO@*/ | |
846 | #define XOR_PRIO (OR_PRIO+2) | |
847 | ||
848 | /*@constant int AND_PRIO@*/ | |
849 | #define AND_PRIO (XOR_PRIO+2) | |
850 | ||
851 | /*@constant int CPP_EQUAL_PRIO@*/ | |
852 | #define CPP_EQUAL_PRIO (AND_PRIO+2) | |
853 | ||
854 | /*@constant int LESS_PRIO@*/ | |
855 | #define LESS_PRIO (CPP_EQUAL_PRIO+2) | |
856 | ||
857 | /*@constant int SHIFT_PRIO@*/ | |
858 | #define SHIFT_PRIO (LESS_PRIO+2) | |
859 | ||
860 | /*@constant int PLUS_PRIO@*/ | |
861 | #define PLUS_PRIO (SHIFT_PRIO+2) | |
862 | ||
863 | /*@constant int MUL_PRIO@*/ | |
864 | #define MUL_PRIO (PLUS_PRIO+2) | |
865 | ||
866 | /*@constant int UNARY_PRIO@*/ | |
867 | #define UNARY_PRIO (MUL_PRIO+2) | |
868 | ||
869 | /*@constant int PAREN_OUTER_PRIO@*/ | |
870 | #define PAREN_OUTER_PRIO (UNARY_PRIO+2) | |
871 | ||
872 | /*@notfunction@*/ | |
873 | #define COMPARE(OP) \ | |
874 | top->unsignedp = FALSE;\ | |
875 | top->value = ((unsigned1 || unsigned2) \ | |
876 | ? (unsigned long) v1 OP (unsigned long) v2 \ | |
877 | : ((long) v1 OP (long) v2)) ? 1 : 0 | |
878 | ||
879 | /* Parse and evaluate a C expression, reading from PFILE. | |
880 | Returns the value of the expression. */ | |
881 | ||
882 | /*@constant int INIT_STACK_SIZE@*/ | |
883 | # define INIT_STACK_SIZE 20 | |
884 | ||
885 | HOST_WIDE_INT | |
886 | cppReader_parseExpression (cppReader *pfile) | |
887 | { | |
888 | /* The implementation is an operator precedence parser, | |
889 | i.e. a bottom-up parser, using a stack for not-yet-reduced tokens. | |
890 | ||
891 | The stack base is 'stack', and the current stack pointer is 'top'. | |
892 | There is a stack element for each operator (only), | |
893 | and the most recently pushed operator is 'top->op'. | |
894 | An operand (value) is stored in the 'value' field of the stack | |
895 | element of the operator that precedes it. | |
896 | In that case the 'flags' field has the HAVE_VALUE flag set. */ | |
897 | ||
898 | struct operation init_stack[INIT_STACK_SIZE]; | |
899 | struct operation *stack = init_stack; | |
900 | struct operation *limit = stack + INIT_STACK_SIZE; | |
901 | register struct operation *top = stack; | |
902 | int lprio, rprio = 0; | |
903 | int skip_evaluation = 0; | |
904 | ||
905 | top->rprio = 0; | |
906 | top->flags = 0; | |
907 | ||
908 | for (;;) | |
909 | { | |
910 | struct operation op; | |
911 | int flags = 0; | |
912 | ||
913 | /* Read a token */ | |
3e3ec469 | 914 | op = cppexp_lex (pfile); |
616915dd | 915 | |
916 | /* See if the token is an operand, in which case go to set_value. | |
917 | If the token is an operator, figure out its left and right | |
918 | priorities, and then goto maybe_reduce. */ | |
919 | ||
920 | switch (op.op) | |
921 | { | |
922 | case NAME: | |
923 | top->value = 0, top->unsignedp = FALSE; | |
924 | goto set_value; | |
925 | case CPPEXP_INT: | |
926 | case CPPEXP_CHAR: | |
927 | top->value = op.value; | |
928 | top->unsignedp = op.unsignedp; | |
929 | goto set_value; | |
930 | case 0: | |
931 | lprio = 0; goto maybe_reduce; | |
932 | case '+': case '-': | |
933 | /* Is this correct if unary ? FIXME */ | |
934 | flags = RIGHT_OPERAND_REQUIRED; | |
935 | lprio = PLUS_PRIO; rprio = lprio + 1; goto maybe_reduce; | |
936 | case '!': case '~': | |
937 | flags = RIGHT_OPERAND_REQUIRED; | |
938 | rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce; | |
939 | case '*': case '/': case '%': | |
940 | lprio = MUL_PRIO; goto binop; | |
941 | case '<': case '>': case LEQ: case GEQ: | |
942 | lprio = LESS_PRIO; goto binop; | |
943 | case CPP_EQUALTOK: case NOTEQUAL: | |
944 | lprio = CPP_EQUAL_PRIO; goto binop; | |
945 | case LSH: case RSH: | |
946 | lprio = SHIFT_PRIO; goto binop; | |
947 | case '&': lprio = AND_PRIO; goto binop; | |
948 | case '^': lprio = XOR_PRIO; goto binop; | |
949 | case '|': lprio = OR_PRIO; goto binop; | |
950 | case ANDAND: lprio = ANDAND_PRIO; goto binop; | |
951 | case OROR: lprio = OROR_PRIO; goto binop; | |
952 | case ',': | |
953 | lprio = COMMA_PRIO; goto binop; | |
954 | case '(': | |
955 | lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO; | |
956 | goto maybe_reduce; | |
957 | case ')': | |
958 | lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO; | |
959 | goto maybe_reduce; | |
960 | case ':': | |
961 | lprio = COND_PRIO; rprio = COND_PRIO; | |
962 | goto maybe_reduce; | |
963 | case '?': | |
964 | lprio = COND_PRIO + 1; rprio = COND_PRIO; | |
965 | goto maybe_reduce; | |
966 | binop: | |
967 | flags = LEFT_OPERAND_REQUIRED | RIGHT_OPERAND_REQUIRED; | |
968 | rprio = lprio + 1; | |
969 | goto maybe_reduce; | |
970 | default: | |
971 | cppReader_error | |
972 | (pfile, | |
973 | message ("Invalid character in #if: %c", | |
974 | (char) op.op)); | |
975 | goto syntax_error; | |
976 | } | |
977 | ||
978 | set_value: | |
979 | /* Push a value onto the stack. */ | |
980 | if ((top->flags & HAVE_VALUE) != 0) | |
981 | { | |
982 | cppReader_errorLit (pfile, | |
983 | cstring_makeLiteralTemp ("syntax error in #if")); | |
984 | goto syntax_error; | |
985 | } | |
986 | top->flags |= HAVE_VALUE; | |
987 | continue; | |
988 | ||
989 | maybe_reduce: | |
990 | /* Push an operator, and check if we can reduce now. */ | |
991 | while (top->rprio > lprio) | |
992 | { | |
993 | /*@-usedef@*/ | |
994 | long v1 = top[-1].value, v2 = top[0].value; | |
995 | bool unsigned1 = top[-1].unsignedp; | |
996 | bool unsigned2 = top[0].unsignedp; | |
997 | ||
998 | top--; | |
999 | ||
1000 | if (((top[1].flags & LEFT_OPERAND_REQUIRED) != 0) | |
1001 | && ((top[0].flags & HAVE_VALUE) == 0)) | |
1002 | { | |
1003 | cppReader_errorLit (pfile, | |
1004 | cstring_makeLiteralTemp ("syntax error - missing left operand")); | |
1005 | goto syntax_error; | |
1006 | } | |
1007 | if (((top[1].flags & RIGHT_OPERAND_REQUIRED) != 0) | |
1008 | && ((top[1].flags & HAVE_VALUE) == 0)) | |
1009 | { | |
1010 | cppReader_errorLit (pfile, | |
1011 | cstring_makeLiteralTemp ("syntax error - missing right operand")); | |
1012 | goto syntax_error; | |
1013 | } | |
1014 | /* top[0].value = (top[1].op)(v1, v2);*/ | |
1015 | switch (top[1].op) | |
1016 | { | |
1017 | case '+': | |
1018 | if ((top->flags & HAVE_VALUE) == 0) | |
1019 | { /* Unary '+' */ | |
1020 | top->value = v2; | |
1021 | top->unsignedp = unsigned2; | |
1022 | top->flags |= HAVE_VALUE; | |
1023 | } | |
1024 | else | |
1025 | { | |
1026 | top->value = v1 + v2; | |
1027 | top->unsignedp = unsigned1 || unsigned2; | |
1028 | if (!top->unsignedp && (skip_evaluation == 0) | |
1029 | && ! possibleSumSign (v1, v2, top->value)) | |
1030 | integer_overflow (pfile); | |
1031 | } | |
1032 | /*@switchbreak@*/ break; | |
1033 | case '-': | |
1034 | if ((top->flags & HAVE_VALUE) == 0) | |
1035 | { /* Unary '-' */ | |
1036 | top->value = - v2; | |
1037 | if ((skip_evaluation == 0) | |
1038 | && (top->value & v2) < 0 && !unsigned2) | |
1039 | integer_overflow (pfile); | |
1040 | top->unsignedp = unsigned2; | |
1041 | top->flags |= HAVE_VALUE; | |
1042 | } | |
1043 | else | |
1044 | { /* Binary '-' */ | |
1045 | top->value = v1 - v2; | |
1046 | top->unsignedp = unsigned1 || unsigned2; | |
1047 | if (!top->unsignedp && (skip_evaluation == 0) | |
1048 | && !possibleSumSign (top->value, v2, v1)) | |
1049 | { | |
1050 | integer_overflow (pfile); | |
1051 | } | |
1052 | } | |
1053 | /*@switchbreak@*/ break; | |
1054 | case '*': | |
1055 | top->unsignedp = unsigned1 || unsigned2; | |
1056 | ||
1057 | if (top->unsignedp) | |
1058 | { | |
1059 | top->value = (unsigned long) v1 * v2; | |
1060 | } | |
1061 | else if (skip_evaluation == 0) | |
1062 | { | |
1063 | top->value = v1 * v2; | |
1064 | if ((v1 != 0) | |
1065 | && (top->value / v1 != v2 | |
1066 | || (top->value & v1 & v2) < 0)) | |
1067 | { | |
1068 | integer_overflow (pfile); | |
1069 | } | |
1070 | } | |
1071 | else | |
1072 | { | |
1073 | ; | |
1074 | } | |
1075 | ||
1076 | /*@switchbreak@*/ break; | |
1077 | case '/': | |
1078 | if (skip_evaluation != 0) | |
1079 | /*@switchbreak@*/ break; | |
1080 | if (v2 == 0) | |
1081 | { | |
1082 | cppReader_errorLit (pfile, | |
1083 | cstring_makeLiteralTemp ("Division by zero in #if")); | |
1084 | v2 = 1; | |
1085 | } | |
1086 | top->unsignedp = unsigned1 || unsigned2; | |
1087 | if (top->unsignedp) | |
1088 | top->value = (unsigned long) v1 / v2; | |
1089 | else | |
1090 | { | |
1091 | top->value = v1 / v2; | |
1092 | if ((top->value & v1 & v2) < 0) | |
1093 | integer_overflow (pfile); | |
1094 | } | |
1095 | /*@switchbreak@*/ break; | |
1096 | case '%': | |
1097 | if (skip_evaluation != 0) | |
1098 | /*@switchbreak@*/ break; | |
1099 | if (v2 == 0) | |
1100 | { | |
1101 | cppReader_errorLit (pfile, | |
1102 | cstring_makeLiteralTemp ("Division by zero in #if")); | |
1103 | v2 = 1; | |
1104 | } | |
1105 | top->unsignedp = unsigned1 || unsigned2; | |
1106 | if (top->unsignedp) | |
1107 | top->value = (unsigned long) v1 % v2; | |
1108 | else | |
1109 | top->value = v1 % v2; | |
1110 | /*@switchbreak@*/ break; | |
1111 | case '!': | |
1112 | if ((top->flags & HAVE_VALUE) != 0) | |
1113 | { | |
1114 | cppReader_errorLit (pfile, | |
1115 | cstring_makeLiteralTemp ("Syntax error")); | |
1116 | goto syntax_error; | |
1117 | } | |
1118 | ||
1119 | top->value = (v2 == 0) ? 1 : 0; | |
1120 | top->unsignedp = FALSE; | |
1121 | top->flags |= HAVE_VALUE; | |
1122 | /*@switchbreak@*/ break; | |
1123 | case '~': | |
1124 | if ((top->flags & HAVE_VALUE) != 0) | |
1125 | { | |
1126 | cppReader_errorLit (pfile, | |
1127 | cstring_makeLiteralTemp ("syntax error")); | |
1128 | goto syntax_error; | |
1129 | } | |
1130 | top->value = ~ v2; | |
1131 | top->unsignedp = unsigned2; | |
1132 | top->flags |= HAVE_VALUE; | |
1133 | /*@switchbreak@*/ break; | |
1134 | case '<': COMPARE(<); /*@switchbreak@*/ break; | |
1135 | case '>': COMPARE(>); /*@switchbreak@*/ break; | |
1136 | case LEQ: COMPARE(<=); /*@switchbreak@*/ break; | |
1137 | case GEQ: COMPARE(>=); /*@switchbreak@*/ break; | |
1138 | case CPP_EQUALTOK: | |
1139 | top->value = (v1 == v2) ? 1 : 0; | |
1140 | top->unsignedp = FALSE; | |
1141 | /*@switchbreak@*/ break; | |
1142 | case NOTEQUAL: | |
1143 | top->value = (v1 != v2) ? 1 : 0; | |
1144 | top->unsignedp = FALSE; | |
1145 | /*@switchbreak@*/ break; | |
1146 | case LSH: | |
1147 | if (skip_evaluation != 0) | |
1148 | { | |
1149 | /*@switchbreak@*/ break; | |
1150 | } | |
1151 | ||
1152 | top->unsignedp = unsigned1; | |
1153 | if (v2 < 0 && ! unsigned2) | |
1154 | top->value = right_shift (v1, unsigned1, -v2); | |
1155 | else | |
1156 | top->value = left_shift (pfile, v1, unsigned1, v2); | |
1157 | /*@switchbreak@*/ break; | |
1158 | case RSH: | |
1159 | if (skip_evaluation != 0) | |
1160 | { | |
1161 | /*@switchbreak@*/ break; | |
1162 | } | |
1163 | top->unsignedp = unsigned1; | |
1164 | if (v2 < 0 && ! unsigned2) | |
1165 | top->value = left_shift (pfile, v1, unsigned1, -v2); | |
1166 | else | |
1167 | top->value = right_shift (v1, unsigned1, v2); | |
1168 | /*@switchbreak@*/ break; | |
1169 | ||
1170 | /*@notfunction@*/ | |
1171 | #define LOGICAL(OP) \ | |
1172 | top->value = v1 OP v2;\ | |
1173 | top->unsignedp = unsigned1 || unsigned2; | |
1174 | ||
1175 | case '&': LOGICAL(&); /*@switchbreak@*/ break; | |
1176 | case '^': LOGICAL(^); /*@switchbreak@*/ break; | |
1177 | case '|': LOGICAL(|); /*@switchbreak@*/ break; | |
1178 | case ANDAND: | |
1179 | top->value = ((v1 != 0) && (v2 != 0)) ? 1 : 0; | |
1180 | top->unsignedp = FALSE; | |
1181 | ||
1182 | if (v1 == 0) | |
1183 | { | |
1184 | skip_evaluation--; | |
1185 | } | |
1186 | /*@switchbreak@*/ break; | |
1187 | case OROR: | |
1188 | top->value = ((v1 != 0) || (v2 != 0)) ? 1 : 0; | |
1189 | top->unsignedp = FALSE; | |
1190 | if (v1 != 0) | |
1191 | { | |
1192 | skip_evaluation--; | |
1193 | } | |
1194 | /*@switchbreak@*/ break; | |
1195 | case ',': | |
1196 | if (cppReader_isPedantic (pfile)) | |
1197 | cppReader_pedwarnLit (pfile, | |
1198 | cstring_makeLiteralTemp ("comma operator in operand of `#if'")); | |
1199 | top->value = v2; | |
1200 | top->unsignedp = unsigned2; | |
1201 | /*@switchbreak@*/ break; | |
1202 | case '(': case '?': | |
1203 | cppReader_errorLit (pfile, | |
1204 | cstring_makeLiteralTemp ("syntax error in #if")); | |
1205 | goto syntax_error; | |
1206 | case ':': | |
1207 | if (top[0].op != '?') | |
1208 | { | |
1209 | cppReader_errorLit (pfile, | |
1210 | cstring_makeLiteralTemp ("syntax error ':' without preceding '?'")); | |
1211 | goto syntax_error; | |
1212 | } | |
1213 | else if (((top[1].flags & HAVE_VALUE) == 0) | |
1214 | || ((top[-1].flags & HAVE_VALUE) == 0) | |
1215 | || ((top[0].flags & HAVE_VALUE) == 0)) | |
1216 | { | |
1217 | cppReader_errorLit (pfile, | |
1218 | cstring_makeLiteralTemp ("bad syntax for ?: operator")); | |
1219 | goto syntax_error; | |
1220 | } | |
1221 | else | |
1222 | { | |
1223 | top--; | |
1224 | if (top->value != 0) | |
1225 | { | |
1226 | skip_evaluation--; | |
1227 | } | |
1228 | ||
1229 | top->value = (top->value != 0) ? v1 : v2; | |
1230 | top->unsignedp = unsigned1 || unsigned2; | |
1231 | } | |
1232 | /*@switchbreak@*/ break; | |
1233 | case ')': | |
1234 | if (((top[1].flags & HAVE_VALUE) != 0) | |
1235 | || ((top[0].flags & HAVE_VALUE) == 0) | |
1236 | || top[0].op != '(' | |
1237 | || ((top[-1].flags & HAVE_VALUE) != 0)) | |
1238 | { | |
1239 | cppReader_errorLit (pfile, | |
1240 | cstring_makeLiteralTemp ("mismatched parentheses in #if")); | |
1241 | goto syntax_error; | |
1242 | } | |
1243 | else | |
1244 | { | |
1245 | top--; | |
1246 | top->value = v1; | |
1247 | top->unsignedp = unsigned1; | |
1248 | top->flags |= HAVE_VALUE; | |
1249 | } | |
1250 | /*@switchbreak@*/ break; | |
1251 | default: | |
28bf4b0b | 1252 | /*@-formatconst@*/ |
616915dd | 1253 | fprintf (stderr, |
1254 | top[1].op >= ' ' && top[1].op <= '~' | |
1255 | ? "unimplemented operator '%c'\n" | |
1256 | : "unimplemented operator '\\%03o'\n", | |
1257 | top[1].op); | |
28bf4b0b | 1258 | /*@=formatconst@*/ |
616915dd | 1259 | } |
1260 | } | |
1261 | if (op.op == 0) | |
1262 | { | |
1263 | long val; | |
1264 | ||
1265 | if (top != stack) | |
1266 | { | |
1267 | cppReader_errorLit (pfile, | |
1268 | cstring_makeLiteralTemp ("internal error in #if expression")); | |
1269 | } | |
1270 | ||
1271 | val = top->value; | |
1272 | ||
1273 | if (stack != init_stack) | |
1274 | { | |
1275 | sfree (stack); | |
1276 | /*@-branchstate@*/ | |
1277 | } /*@=branchstate@*/ | |
1278 | ||
1279 | return val; | |
1280 | } | |
1281 | top++; | |
1282 | ||
1283 | /* Check for and handle stack overflow. */ | |
1284 | if (top == limit) | |
1285 | { | |
1286 | struct operation *new_stack; | |
1287 | int old_size = (char *) limit - (char *) stack; | |
1288 | size_t new_size = size_fromInt (2 * old_size); | |
1289 | ||
1290 | if (stack != init_stack) | |
1291 | { | |
1292 | new_stack = (struct operation *) drealloc ((char *) stack, | |
1293 | new_size); | |
1294 | } | |
1295 | else | |
1296 | { | |
1297 | new_stack = (struct operation *) dmalloc (new_size); | |
1298 | ||
1299 | /* Bug: the parameters were in the wrong order! */ | |
1300 | memcpy ((char *) new_stack, (char *) stack, old_size); | |
1301 | /*@-branchstate@*/ | |
1302 | } /*@=branchstate@*/ | |
1303 | ||
1304 | stack = new_stack; | |
1305 | top = (struct operation *) ((char *) new_stack + old_size); | |
1306 | limit = (struct operation *) ((char *) new_stack + new_size); | |
1307 | /*@-branchstate@*/ | |
1308 | } /*@=branchstate@*/ | |
1309 | ||
1310 | top->flags = flags; | |
1311 | top->rprio = rprio; | |
1312 | top->op = op.op; | |
1313 | if ((op.op == OROR && (top[-1].value != 0)) | |
1314 | || (op.op == ANDAND && (top[-1].value == 0)) | |
1315 | || (op.op == '?' && (top[-1].value == 0))) | |
1316 | { | |
1317 | skip_evaluation++; | |
1318 | } | |
1319 | else if (op.op == ':') | |
1320 | { | |
1321 | if (top[-2].value != 0) /* Was condition true? */ | |
1322 | { | |
1323 | skip_evaluation++; | |
1324 | } | |
1325 | else | |
1326 | { | |
1327 | skip_evaluation--; | |
1328 | } | |
1329 | } | |
1330 | else | |
1331 | { | |
1332 | ; | |
1333 | } | |
1334 | } | |
1335 | syntax_error: | |
1336 | /*@-usereleased@*/ | |
1337 | if (stack != init_stack) | |
1338 | { | |
1339 | sfree (stack); | |
1340 | /*@-branchstate@*/ | |
1341 | } /*@=branchstate@*/ | |
1342 | /*@=usereleased@*/ | |
1343 | ||
1344 | cppReader_skipRestOfLine (pfile); | |
1345 | return 0; | |
1346 | } |