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Commit | Line | Data |
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7f2935c7 | 1 | /* Parse C expressions for CCCP. |
525bc95d | 2 | Copyright (C) 1987, 92, 94, 95, 97, 98, 1999, 2000 Free Software Foundation. |
7f2935c7 PB |
3 | |
4 | This program is free software; you can redistribute it and/or modify it | |
5 | under the terms of the GNU General Public License as published by the | |
6 | Free Software Foundation; either version 2, or (at your option) any | |
7 | later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
940d9d63 RK |
16 | Foundation, 59 Temple Place - Suite 330, |
17 | Boston, MA 02111-1307, USA. | |
7f2935c7 PB |
18 | |
19 | In other words, you are welcome to use, share and improve this program. | |
20 | You are forbidden to forbid anyone else to use, share and improve | |
21 | what you give them. Help stamp out software-hoarding! | |
22 | ||
0f41302f | 23 | Written by Per Bothner 1994. */ |
7f2935c7 PB |
24 | |
25 | /* Parse a C expression from text in a string */ | |
26 | ||
27 | #include "config.h" | |
b04cd507 | 28 | #include "system.h" |
487a6e06 | 29 | #include "cpplib.h" |
7f2935c7 | 30 | |
9870475c | 31 | #ifdef MULTIBYTE_CHARS |
7f2935c7 PB |
32 | #include <locale.h> |
33 | #endif | |
34 | ||
7f2935c7 PB |
35 | #ifndef CHAR_TYPE_SIZE |
36 | #define CHAR_TYPE_SIZE BITS_PER_UNIT | |
37 | #endif | |
38 | ||
39 | #ifndef INT_TYPE_SIZE | |
40 | #define INT_TYPE_SIZE BITS_PER_WORD | |
41 | #endif | |
42 | ||
43 | #ifndef LONG_TYPE_SIZE | |
44 | #define LONG_TYPE_SIZE BITS_PER_WORD | |
45 | #endif | |
46 | ||
47 | #ifndef WCHAR_TYPE_SIZE | |
48 | #define WCHAR_TYPE_SIZE INT_TYPE_SIZE | |
49 | #endif | |
50 | ||
51 | #ifndef MAX_CHAR_TYPE_SIZE | |
52 | #define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE | |
53 | #endif | |
54 | ||
55 | #ifndef MAX_INT_TYPE_SIZE | |
56 | #define MAX_INT_TYPE_SIZE INT_TYPE_SIZE | |
57 | #endif | |
58 | ||
59 | #ifndef MAX_LONG_TYPE_SIZE | |
60 | #define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE | |
61 | #endif | |
62 | ||
63 | #ifndef MAX_WCHAR_TYPE_SIZE | |
64 | #define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE | |
65 | #endif | |
66 | ||
e915b770 KG |
67 | #define MAX_CHAR_TYPE_MASK (MAX_CHAR_TYPE_SIZE < HOST_BITS_PER_WIDEST_INT \ |
68 | ? (~ (~ (HOST_WIDEST_INT) 0 << MAX_CHAR_TYPE_SIZE)) \ | |
69 | : ~ (HOST_WIDEST_INT) 0) | |
f1a86df6 | 70 | |
e915b770 KG |
71 | #define MAX_WCHAR_TYPE_MASK (MAX_WCHAR_TYPE_SIZE < HOST_BITS_PER_WIDEST_INT \ |
72 | ? ~ (~ (HOST_WIDEST_INT) 0 << MAX_WCHAR_TYPE_SIZE) \ | |
73 | : ~ (HOST_WIDEST_INT) 0) | |
f1a86df6 | 74 | |
7f2935c7 PB |
75 | /* Yield nonzero if adding two numbers with A's and B's signs can yield a |
76 | number with SUM's sign, where A, B, and SUM are all C integers. */ | |
77 | #define possible_sum_sign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0) | |
78 | ||
b04cd507 | 79 | static void integer_overflow PARAMS ((cpp_reader *)); |
ca261cb4 KG |
80 | static HOST_WIDEST_INT left_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT, int, unsigned HOST_WIDEST_INT)); |
81 | static HOST_WIDEST_INT right_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT, int, unsigned HOST_WIDEST_INT)); | |
bcc5cac9 KG |
82 | static struct operation parse_number PARAMS ((cpp_reader *, U_CHAR *, U_CHAR *)); |
83 | static struct operation parse_charconst PARAMS ((cpp_reader *, U_CHAR *, U_CHAR *)); | |
ba412f14 | 84 | static struct operation parse_defined PARAMS ((cpp_reader *)); |
bcc5cac9 KG |
85 | static struct operation cpp_lex PARAMS ((cpp_reader *, int)); |
86 | extern HOST_WIDEST_INT cpp_parse_expr PARAMS ((cpp_reader *)); | |
a2c8e144 | 87 | static HOST_WIDEST_INT cpp_parse_escape PARAMS ((cpp_reader *, U_CHAR **, HOST_WIDEST_INT)); |
7f2935c7 PB |
88 | |
89 | #define ERROR 299 | |
90 | #define OROR 300 | |
91 | #define ANDAND 301 | |
92 | #define EQUAL 302 | |
93 | #define NOTEQUAL 303 | |
94 | #define LEQ 304 | |
95 | #define GEQ 305 | |
96 | #define LSH 306 | |
97 | #define RSH 307 | |
98 | #define NAME 308 | |
99 | #define INT 309 | |
100 | #define CHAR 310 | |
101 | ||
102 | #define LEFT_OPERAND_REQUIRED 1 | |
103 | #define RIGHT_OPERAND_REQUIRED 2 | |
104 | #define HAVE_VALUE 4 | |
a4a315ef | 105 | /* SKIP_OPERAND is set for '&&' '||' '?' and ':' when the |
0f41302f | 106 | following operand should be short-circuited instead of evaluated. */ |
a4a315ef PB |
107 | #define SKIP_OPERAND 8 |
108 | /*#define UNSIGNEDP 16*/ | |
7f2935c7 PB |
109 | |
110 | struct operation { | |
111 | short op; | |
0f41302f | 112 | char rprio; /* Priority of op (relative to it right operand). */ |
7f2935c7 PB |
113 | char flags; |
114 | char unsignedp; /* true if value should be treated as unsigned */ | |
e915b770 | 115 | HOST_WIDEST_INT value; /* The value logically "right" of op. */ |
7f2935c7 | 116 | }; |
7f2935c7 | 117 | |
f13eb63a ZW |
118 | /* Parse and convert an integer for #if. Accepts decimal, hex, or octal |
119 | with or without size suffixes. */ | |
7f2935c7 | 120 | |
f13eb63a ZW |
121 | static struct operation |
122 | parse_number (pfile, start, end) | |
7f2935c7 | 123 | cpp_reader *pfile; |
f13eb63a ZW |
124 | U_CHAR *start; |
125 | U_CHAR *end; | |
7f2935c7 PB |
126 | { |
127 | struct operation op; | |
f13eb63a ZW |
128 | U_CHAR *p = start; |
129 | int c; | |
e915b770 | 130 | unsigned HOST_WIDEST_INT n = 0, nd, MAX_over_base; |
f13eb63a ZW |
131 | int base = 10; |
132 | int overflow = 0; | |
133 | int digit, largest_digit = 0; | |
7f2935c7 PB |
134 | int spec_long = 0; |
135 | ||
136 | op.unsignedp = 0; | |
137 | ||
f13eb63a ZW |
138 | if (p[0] == '0') |
139 | { | |
140 | if (end - start >= 3 && (p[1] == 'x' || p[1] == 'X')) | |
141 | { | |
142 | p += 2; | |
143 | base = 16; | |
144 | } | |
145 | else | |
146 | { | |
147 | p += 1; | |
148 | base = 8; | |
149 | } | |
7f2935c7 PB |
150 | } |
151 | ||
0f41302f | 152 | /* Some buggy compilers (e.g. MPW C) seem to need both casts. */ |
e915b770 KG |
153 | MAX_over_base = (((unsigned HOST_WIDEST_INT) -1) |
154 | / ((unsigned HOST_WIDEST_INT) base)); | |
7f2935c7 | 155 | |
f13eb63a ZW |
156 | while (p < end) |
157 | { | |
158 | c = *p++; | |
159 | ||
160 | if (c >= '0' && c <= '9') | |
161 | digit = c - '0'; | |
162 | else if (base == 16 && c >= 'a' && c <= 'f') /* FIXME: assumes ASCII */ | |
163 | digit = c - 'a' + 10; | |
164 | else if (base == 16 && c >= 'A' && c <= 'F') | |
165 | digit = c - 'A' + 10; | |
166 | else if (c == '.') | |
167 | { | |
168 | /* It's a float since it contains a point. */ | |
169 | cpp_error (pfile, | |
170 | "floating point numbers are not allowed in #if expressions"); | |
171 | goto error; | |
172 | } | |
173 | else | |
174 | { | |
175 | /* `l' means long, and `u' means unsigned. */ | |
176 | for (;;) | |
177 | { | |
178 | if (c == 'l' || c == 'L') | |
179 | spec_long++; | |
180 | else if (c == 'u' || c == 'U') | |
181 | op.unsignedp++; | |
182 | else | |
183 | { | |
184 | /* Decrement p here so that the error for an invalid number | |
185 | will be generated below in the case where this is the | |
186 | last character in the buffer. */ | |
187 | p--; | |
188 | break; | |
189 | } | |
190 | if (p == end) | |
191 | break; | |
192 | c = *p++; | |
193 | } | |
194 | /* Don't look for any more digits after the suffixes. */ | |
7f2935c7 | 195 | break; |
f13eb63a ZW |
196 | } |
197 | ||
198 | if (largest_digit < digit) | |
199 | largest_digit = digit; | |
200 | nd = n * base + digit; | |
201 | overflow |= MAX_over_base < n || nd < n; | |
202 | n = nd; | |
7f2935c7 | 203 | } |
7f2935c7 | 204 | |
f13eb63a | 205 | if (p != end) |
7f2935c7 | 206 | { |
f13eb63a ZW |
207 | cpp_error (pfile, "invalid number in #if expression"); |
208 | goto error; | |
7f2935c7 | 209 | } |
f13eb63a ZW |
210 | else if (spec_long > (CPP_OPTIONS (pfile)->c89 ? 1 : 2)) |
211 | { | |
212 | cpp_error (pfile, "too many `l' suffixes in integer constant"); | |
213 | goto error; | |
214 | } | |
215 | else if (op.unsignedp > 1) | |
216 | { | |
217 | cpp_error (pfile, "too many `u' suffixes in integer constant"); | |
218 | goto error; | |
219 | } | |
220 | ||
7f2935c7 | 221 | if (base <= largest_digit) |
7c4033ff | 222 | cpp_pedwarn (pfile, "integer constant contains digits beyond the radix"); |
7f2935c7 PB |
223 | |
224 | if (overflow) | |
7c4033ff | 225 | cpp_pedwarn (pfile, "integer constant out of range"); |
7f2935c7 PB |
226 | |
227 | /* If too big to be signed, consider it unsigned. */ | |
e915b770 | 228 | else if ((HOST_WIDEST_INT) n < 0 && ! op.unsignedp) |
7f2935c7 PB |
229 | { |
230 | if (base == 10) | |
f13eb63a ZW |
231 | cpp_warning (pfile, |
232 | "integer constant is so large that it is unsigned"); | |
7f2935c7 PB |
233 | op.unsignedp = 1; |
234 | } | |
235 | ||
236 | op.value = n; | |
237 | op.op = INT; | |
238 | return op; | |
f13eb63a ZW |
239 | |
240 | error: | |
241 | op.op = ERROR; | |
242 | return op; | |
7f2935c7 PB |
243 | } |
244 | ||
f13eb63a ZW |
245 | /* Parse and convert a character constant for #if. Understands backslash |
246 | escapes (\n, \031) and multibyte characters (if so configured). */ | |
247 | static struct operation | |
248 | parse_charconst (pfile, start, end) | |
249 | cpp_reader *pfile; | |
250 | U_CHAR *start; | |
251 | U_CHAR *end; | |
252 | { | |
253 | struct operation op; | |
e915b770 | 254 | HOST_WIDEST_INT result = 0; |
f13eb63a ZW |
255 | int num_chars = 0; |
256 | int num_bits; | |
257 | unsigned int width = MAX_CHAR_TYPE_SIZE, mask = MAX_CHAR_TYPE_MASK; | |
258 | int max_chars; | |
259 | U_CHAR *ptr = start; | |
260 | ||
261 | /* FIXME: Should use reentrant multibyte functions. */ | |
262 | #ifdef MULTIBYTE_CHARS | |
099a9dd0 | 263 | wchar_t c = (wchar_t)-1; |
f13eb63a ZW |
264 | (void) mbtowc (NULL_PTR, NULL_PTR, 0); |
265 | #else | |
099a9dd0 | 266 | int c = -1; |
f13eb63a ZW |
267 | #endif |
268 | ||
269 | if (*ptr == 'L') | |
270 | { | |
271 | ++ptr; | |
272 | width = MAX_WCHAR_TYPE_SIZE, mask = MAX_WCHAR_TYPE_MASK; | |
273 | } | |
274 | max_chars = MAX_LONG_TYPE_SIZE / width; | |
275 | ||
276 | ++ptr; /* skip initial quote */ | |
277 | ||
278 | while (ptr < end) | |
279 | { | |
280 | #ifndef MULTIBYTE_CHARS | |
281 | c = *ptr++; | |
282 | #else | |
283 | ptr += mbtowc (&c, ptr, end - ptr); | |
284 | #endif | |
285 | if (c == '\'' || c == '\0') | |
286 | break; | |
287 | else if (c == '\\') | |
288 | { | |
289 | /* Hopefully valid assumption: if mbtowc returns a backslash, | |
290 | we are in initial shift state. No valid escape-sequence | |
291 | character can take us out of initial shift state or begin | |
292 | an unshifted multibyte char, so cpp_parse_escape doesn't | |
293 | need to know about multibyte chars. */ | |
294 | ||
a2c8e144 | 295 | c = cpp_parse_escape (pfile, &ptr, mask); |
f13eb63a ZW |
296 | if (width < HOST_BITS_PER_INT |
297 | && (unsigned int) c >= (unsigned int)(1 << width)) | |
298 | cpp_pedwarn (pfile, "escape sequence out of range for character"); | |
299 | } | |
300 | ||
301 | /* Merge character into result; ignore excess chars. */ | |
302 | if (++num_chars <= max_chars) | |
303 | { | |
304 | if (width < HOST_BITS_PER_INT) | |
305 | result = (result << width) | (c & ((1 << width) - 1)); | |
306 | else | |
307 | result = c; | |
308 | } | |
309 | } | |
310 | ||
311 | if (num_chars == 0) | |
312 | { | |
313 | cpp_error (pfile, "empty character constant"); | |
314 | goto error; | |
315 | } | |
316 | else if (c != '\'') | |
317 | { | |
318 | /* cpp_get_token has already emitted an error if !traditional. */ | |
319 | if (! CPP_TRADITIONAL (pfile)) | |
320 | cpp_error (pfile, "malformatted character constant"); | |
321 | goto error; | |
322 | } | |
323 | else if (num_chars > max_chars) | |
324 | { | |
325 | cpp_error (pfile, "character constant too long"); | |
326 | goto error; | |
327 | } | |
328 | else if (num_chars != 1 && ! CPP_TRADITIONAL (pfile)) | |
329 | cpp_warning (pfile, "multi-character character constant"); | |
330 | ||
331 | /* If char type is signed, sign-extend the constant. */ | |
332 | num_bits = num_chars * width; | |
333 | ||
cf4ed945 ZW |
334 | if (cpp_defined (pfile, (const U_CHAR *)"__CHAR_UNSIGNED__", |
335 | sizeof ("__CHAR_UNSIGNED__")-1) | |
f13eb63a | 336 | || ((result >> (num_bits - 1)) & 1) == 0) |
ca261cb4 KG |
337 | op.value = result & ((unsigned HOST_WIDEST_INT) ~0 |
338 | >> (HOST_BITS_PER_WIDEST_INT - num_bits)); | |
f13eb63a | 339 | else |
ca261cb4 KG |
340 | op.value = result | ~((unsigned HOST_WIDEST_INT) ~0 |
341 | >> (HOST_BITS_PER_WIDEST_INT - num_bits)); | |
f13eb63a ZW |
342 | |
343 | /* This is always a signed type. */ | |
344 | op.unsignedp = 0; | |
345 | op.op = CHAR; | |
346 | return op; | |
347 | ||
348 | error: | |
349 | op.op = ERROR; | |
350 | return op; | |
351 | } | |
352 | ||
ba412f14 ZW |
353 | static struct operation |
354 | parse_defined (pfile) | |
355 | cpp_reader *pfile; | |
356 | { | |
357 | int paren = 0, len; | |
358 | U_CHAR *tok; | |
359 | enum cpp_token token; | |
360 | struct operation op; | |
361 | long old_written = CPP_WRITTEN (pfile); | |
362 | ||
363 | op.unsignedp = 0; | |
364 | op.op = INT; | |
365 | ||
366 | pfile->no_macro_expand++; | |
367 | token = get_directive_token (pfile); | |
368 | if (token == CPP_LPAREN) | |
369 | { | |
370 | paren++; | |
371 | CPP_SET_WRITTEN (pfile, old_written); | |
372 | token = get_directive_token (pfile); | |
373 | } | |
374 | ||
375 | if (token != CPP_NAME) | |
376 | goto oops; | |
377 | ||
378 | tok = pfile->token_buffer + old_written; | |
379 | len = CPP_PWRITTEN (pfile) - tok; | |
380 | op.value = cpp_defined (pfile, tok, len); | |
381 | ||
382 | if (paren) | |
383 | { | |
384 | if (get_directive_token (pfile) != CPP_RPAREN) | |
385 | goto oops; | |
386 | } | |
387 | CPP_SET_WRITTEN (pfile, old_written); | |
388 | pfile->no_macro_expand--; | |
389 | return op; | |
390 | ||
391 | oops: | |
392 | CPP_SET_WRITTEN (pfile, old_written); | |
393 | pfile->no_macro_expand--; | |
394 | cpp_error (pfile, "`defined' without an identifier"); | |
395 | ||
396 | op.op = ERROR; | |
397 | return op; | |
398 | } | |
399 | ||
f13eb63a | 400 | |
7f2935c7 | 401 | struct token { |
bcc5cac9 | 402 | const char *operator; |
7f2935c7 PB |
403 | int token; |
404 | }; | |
405 | ||
455d2586 | 406 | static const struct token tokentab2[] = { |
7f2935c7 PB |
407 | {"&&", ANDAND}, |
408 | {"||", OROR}, | |
409 | {"<<", LSH}, | |
410 | {">>", RSH}, | |
411 | {"==", EQUAL}, | |
412 | {"!=", NOTEQUAL}, | |
413 | {"<=", LEQ}, | |
414 | {">=", GEQ}, | |
415 | {"++", ERROR}, | |
416 | {"--", ERROR}, | |
417 | {NULL, ERROR} | |
418 | }; | |
419 | ||
0f41302f | 420 | /* Read one token. */ |
7f2935c7 | 421 | |
6de1e2a9 | 422 | static struct operation |
c9666c01 | 423 | cpp_lex (pfile, skip_evaluation) |
52529158 | 424 | cpp_reader *pfile; |
c9666c01 | 425 | int skip_evaluation; |
7f2935c7 | 426 | { |
455d2586 | 427 | const struct token *toktab; |
7f2935c7 PB |
428 | enum cpp_token token; |
429 | struct operation op; | |
430 | U_CHAR *tok_start, *tok_end; | |
cf4ed945 | 431 | long old_written; |
7f2935c7 | 432 | |
1519594d | 433 | old_written = CPP_WRITTEN (pfile); |
cf4ed945 | 434 | token = get_directive_token (pfile); |
7f2935c7 | 435 | |
7f2935c7 PB |
436 | tok_start = pfile->token_buffer + old_written; |
437 | tok_end = CPP_PWRITTEN (pfile); | |
cf4ed945 | 438 | CPP_SET_WRITTEN (pfile, old_written); |
7f2935c7 | 439 | switch (token) |
ba412f14 | 440 | { |
0f41302f | 441 | case CPP_EOF: /* Should not happen ... */ |
a4a315ef | 442 | case CPP_VSPACE: |
7f2935c7 PB |
443 | op.op = 0; |
444 | return op; | |
7f2935c7 | 445 | case CPP_NUMBER: |
f13eb63a | 446 | return parse_number (pfile, tok_start, tok_end); |
7f2935c7 | 447 | case CPP_STRING: |
525bc95d | 448 | case CPP_WSTRING: |
cf4ed945 | 449 | cpp_error (pfile, "string constants are not allowed in #if expressions"); |
7f2935c7 PB |
450 | op.op = ERROR; |
451 | return op; | |
525bc95d | 452 | |
7f2935c7 | 453 | case CPP_CHAR: |
525bc95d | 454 | case CPP_WCHAR: |
f13eb63a | 455 | return parse_charconst (pfile, tok_start, tok_end); |
7f2935c7 PB |
456 | |
457 | case CPP_NAME: | |
ba412f14 ZW |
458 | if (!strcmp (tok_start, "defined")) |
459 | return parse_defined (pfile); | |
460 | ||
f13eb63a ZW |
461 | op.op = INT; |
462 | op.unsignedp = 0; | |
463 | op.value = 0; | |
5dfa4da1 | 464 | |
ba412f14 ZW |
465 | if (CPP_WARN_UNDEF (pfile) && !skip_evaluation) |
466 | cpp_warning (pfile, "`%.*s' is not defined", | |
467 | (int) (tok_end - tok_start), tok_start); | |
5dfa4da1 ZW |
468 | return op; |
469 | ||
ba412f14 ZW |
470 | case CPP_ASSERTION: |
471 | op.op = INT; | |
472 | op.unsignedp = 0; | |
473 | op.value = cpp_defined (pfile, tok_start, tok_end - tok_start); | |
f13eb63a | 474 | return op; |
7f2935c7 PB |
475 | |
476 | case CPP_OTHER: | |
477 | /* See if it is a special token of length 2. */ | |
478 | if (tok_start + 2 == tok_end) | |
479 | { | |
480 | for (toktab = tokentab2; toktab->operator != NULL; toktab++) | |
481 | if (tok_start[0] == toktab->operator[0] | |
482 | && tok_start[1] == toktab->operator[1]) | |
483 | break; | |
484 | if (toktab->token == ERROR) | |
ab87f8c8 JL |
485 | cpp_error (pfile, "`%s' not allowed in operand of `#if'", |
486 | tok_start); | |
7f2935c7 PB |
487 | op.op = toktab->token; |
488 | return op; | |
489 | } | |
490 | /* fall through */ | |
491 | default: | |
492 | op.op = *tok_start; | |
493 | return op; | |
494 | } | |
495 | } | |
496 | ||
497 | ||
498 | /* Parse a C escape sequence. STRING_PTR points to a variable | |
499 | containing a pointer to the string to parse. That pointer | |
500 | is updated past the characters we use. The value of the | |
501 | escape sequence is returned. | |
502 | ||
503 | A negative value means the sequence \ newline was seen, | |
504 | which is supposed to be equivalent to nothing at all. | |
505 | ||
506 | If \ is followed by a null character, we return a negative | |
507 | value and leave the string pointer pointing at the null character. | |
508 | ||
509 | If \ is followed by 000, we return 0 and leave the string pointer | |
510 | after the zeros. A value of 0 does not mean end of string. */ | |
511 | ||
a2c8e144 | 512 | static HOST_WIDEST_INT |
f1a86df6 | 513 | cpp_parse_escape (pfile, string_ptr, result_mask) |
7f2935c7 | 514 | cpp_reader *pfile; |
a2c8e144 | 515 | U_CHAR **string_ptr; |
e915b770 | 516 | HOST_WIDEST_INT result_mask; |
7f2935c7 PB |
517 | { |
518 | register int c = *(*string_ptr)++; | |
519 | switch (c) | |
520 | { | |
521 | case 'a': | |
522 | return TARGET_BELL; | |
523 | case 'b': | |
524 | return TARGET_BS; | |
525 | case 'e': | |
526 | case 'E': | |
f1a86df6 | 527 | if (CPP_OPTIONS (pfile)->pedantic) |
7f2935c7 | 528 | cpp_pedwarn (pfile, "non-ANSI-standard escape sequence, `\\%c'", c); |
f3ad1f9c | 529 | return TARGET_ESC; |
7f2935c7 PB |
530 | case 'f': |
531 | return TARGET_FF; | |
532 | case 'n': | |
533 | return TARGET_NEWLINE; | |
534 | case 'r': | |
535 | return TARGET_CR; | |
536 | case 't': | |
537 | return TARGET_TAB; | |
538 | case 'v': | |
539 | return TARGET_VT; | |
540 | case '\n': | |
541 | return -2; | |
542 | case 0: | |
543 | (*string_ptr)--; | |
544 | return 0; | |
545 | ||
546 | case '0': | |
547 | case '1': | |
548 | case '2': | |
549 | case '3': | |
550 | case '4': | |
551 | case '5': | |
552 | case '6': | |
553 | case '7': | |
554 | { | |
e915b770 | 555 | register HOST_WIDEST_INT i = c - '0'; |
7f2935c7 PB |
556 | register int count = 0; |
557 | while (++count < 3) | |
558 | { | |
559 | c = *(*string_ptr)++; | |
560 | if (c >= '0' && c <= '7') | |
561 | i = (i << 3) + c - '0'; | |
562 | else | |
563 | { | |
564 | (*string_ptr)--; | |
565 | break; | |
566 | } | |
567 | } | |
f1a86df6 | 568 | if (i != (i & result_mask)) |
7f2935c7 | 569 | { |
f1a86df6 ZW |
570 | i &= result_mask; |
571 | cpp_pedwarn (pfile, "octal escape sequence out of range"); | |
7f2935c7 PB |
572 | } |
573 | return i; | |
574 | } | |
575 | case 'x': | |
576 | { | |
e915b770 | 577 | register unsigned HOST_WIDEST_INT i = 0, overflow = 0; |
f1a86df6 | 578 | register int digits_found = 0, digit; |
7f2935c7 PB |
579 | for (;;) |
580 | { | |
581 | c = *(*string_ptr)++; | |
582 | if (c >= '0' && c <= '9') | |
583 | digit = c - '0'; | |
584 | else if (c >= 'a' && c <= 'f') | |
585 | digit = c - 'a' + 10; | |
586 | else if (c >= 'A' && c <= 'F') | |
587 | digit = c - 'A' + 10; | |
588 | else | |
589 | { | |
590 | (*string_ptr)--; | |
591 | break; | |
592 | } | |
593 | overflow |= i ^ (i << 4 >> 4); | |
594 | i = (i << 4) + digit; | |
595 | digits_found = 1; | |
596 | } | |
597 | if (!digits_found) | |
598 | cpp_error (pfile, "\\x used with no following hex digits"); | |
f1a86df6 | 599 | if (overflow | (i != (i & result_mask))) |
7f2935c7 | 600 | { |
f1a86df6 ZW |
601 | i &= result_mask; |
602 | cpp_pedwarn (pfile, "hex escape sequence out of range"); | |
7f2935c7 PB |
603 | } |
604 | return i; | |
605 | } | |
606 | default: | |
607 | return c; | |
608 | } | |
609 | } | |
610 | ||
611 | static void | |
612 | integer_overflow (pfile) | |
613 | cpp_reader *pfile; | |
614 | { | |
615 | if (CPP_PEDANTIC (pfile)) | |
616 | cpp_pedwarn (pfile, "integer overflow in preprocessor expression"); | |
617 | } | |
618 | ||
ca261cb4 | 619 | static HOST_WIDEST_INT |
7f2935c7 PB |
620 | left_shift (pfile, a, unsignedp, b) |
621 | cpp_reader *pfile; | |
ca261cb4 | 622 | HOST_WIDEST_INT a; |
7f2935c7 | 623 | int unsignedp; |
ca261cb4 | 624 | unsigned HOST_WIDEST_INT b; |
7f2935c7 | 625 | { |
ca261cb4 | 626 | if (b >= HOST_BITS_PER_WIDEST_INT) |
7f2935c7 PB |
627 | { |
628 | if (! unsignedp && a != 0) | |
629 | integer_overflow (pfile); | |
630 | return 0; | |
631 | } | |
632 | else if (unsignedp) | |
ca261cb4 | 633 | return (unsigned HOST_WIDEST_INT) a << b; |
7f2935c7 PB |
634 | else |
635 | { | |
ca261cb4 | 636 | HOST_WIDEST_INT l = a << b; |
7f2935c7 PB |
637 | if (l >> b != a) |
638 | integer_overflow (pfile); | |
639 | return l; | |
640 | } | |
641 | } | |
642 | ||
ca261cb4 | 643 | static HOST_WIDEST_INT |
7f2935c7 | 644 | right_shift (pfile, a, unsignedp, b) |
d6f4ec51 | 645 | cpp_reader *pfile ATTRIBUTE_UNUSED; |
ca261cb4 | 646 | HOST_WIDEST_INT a; |
7f2935c7 | 647 | int unsignedp; |
ca261cb4 | 648 | unsigned HOST_WIDEST_INT b; |
7f2935c7 | 649 | { |
ca261cb4 KG |
650 | if (b >= HOST_BITS_PER_WIDEST_INT) |
651 | return unsignedp ? 0 : a >> (HOST_BITS_PER_WIDEST_INT - 1); | |
7f2935c7 | 652 | else if (unsignedp) |
ca261cb4 | 653 | return (unsigned HOST_WIDEST_INT) a >> b; |
7f2935c7 PB |
654 | else |
655 | return a >> b; | |
656 | } | |
657 | \f | |
0f41302f | 658 | /* These priorities are all even, so we can handle associatively. */ |
7f2935c7 PB |
659 | #define PAREN_INNER_PRIO 0 |
660 | #define COMMA_PRIO 4 | |
661 | #define COND_PRIO (COMMA_PRIO+2) | |
662 | #define OROR_PRIO (COND_PRIO+2) | |
663 | #define ANDAND_PRIO (OROR_PRIO+2) | |
664 | #define OR_PRIO (ANDAND_PRIO+2) | |
665 | #define XOR_PRIO (OR_PRIO+2) | |
666 | #define AND_PRIO (XOR_PRIO+2) | |
667 | #define EQUAL_PRIO (AND_PRIO+2) | |
668 | #define LESS_PRIO (EQUAL_PRIO+2) | |
669 | #define SHIFT_PRIO (LESS_PRIO+2) | |
670 | #define PLUS_PRIO (SHIFT_PRIO+2) | |
671 | #define MUL_PRIO (PLUS_PRIO+2) | |
672 | #define UNARY_PRIO (MUL_PRIO+2) | |
673 | #define PAREN_OUTER_PRIO (UNARY_PRIO+2) | |
674 | ||
675 | #define COMPARE(OP) \ | |
676 | top->unsignedp = 0;\ | |
faa76596 | 677 | top->value = (unsigned1 || unsigned2) \ |
ca261cb4 | 678 | ? (unsigned HOST_WIDEST_INT) v1 OP (unsigned HOST_WIDEST_INT) v2 : (v1 OP v2) |
7f2935c7 PB |
679 | |
680 | /* Parse and evaluate a C expression, reading from PFILE. | |
681 | Returns the value of the expression. */ | |
682 | ||
e915b770 | 683 | HOST_WIDEST_INT |
7f2935c7 PB |
684 | cpp_parse_expr (pfile) |
685 | cpp_reader *pfile; | |
686 | { | |
687 | /* The implementation is an operator precedence parser, | |
688 | i.e. a bottom-up parser, using a stack for not-yet-reduced tokens. | |
689 | ||
690 | The stack base is 'stack', and the current stack pointer is 'top'. | |
691 | There is a stack element for each operator (only), | |
692 | and the most recently pushed operator is 'top->op'. | |
693 | An operand (value) is stored in the 'value' field of the stack | |
694 | element of the operator that precedes it. | |
695 | In that case the 'flags' field has the HAVE_VALUE flag set. */ | |
696 | ||
697 | #define INIT_STACK_SIZE 20 | |
698 | struct operation init_stack[INIT_STACK_SIZE]; | |
699 | struct operation *stack = init_stack; | |
700 | struct operation *limit = stack + INIT_STACK_SIZE; | |
701 | register struct operation *top = stack; | |
099a9dd0 | 702 | int lprio, rprio = 0; |
a4a315ef | 703 | int skip_evaluation = 0; |
7f2935c7 PB |
704 | |
705 | top->rprio = 0; | |
706 | top->flags = 0; | |
707 | for (;;) | |
708 | { | |
709 | struct operation op; | |
710 | char flags = 0; | |
711 | ||
712 | /* Read a token */ | |
c9666c01 | 713 | op = cpp_lex (pfile, skip_evaluation); |
7f2935c7 PB |
714 | |
715 | /* See if the token is an operand, in which case go to set_value. | |
716 | If the token is an operator, figure out its left and right | |
0f41302f | 717 | priorities, and then goto maybe_reduce. */ |
7f2935c7 PB |
718 | |
719 | switch (op.op) | |
720 | { | |
721 | case NAME: | |
c1212d2f | 722 | cpp_ice (pfile, "cpp_lex returns a NAME"); |
34ca9541 | 723 | goto syntax_error; |
7f2935c7 | 724 | case INT: case CHAR: |
7f2935c7 PB |
725 | goto set_value; |
726 | case 0: | |
727 | lprio = 0; goto maybe_reduce; | |
728 | case '+': case '-': | |
cf4ed945 ZW |
729 | if (top->flags & HAVE_VALUE) |
730 | { | |
731 | lprio = PLUS_PRIO; | |
732 | goto binop; | |
733 | } | |
734 | /* else fall through */ | |
7f2935c7 PB |
735 | case '!': case '~': |
736 | flags = RIGHT_OPERAND_REQUIRED; | |
737 | rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce; | |
738 | case '*': case '/': case '%': | |
739 | lprio = MUL_PRIO; goto binop; | |
740 | case '<': case '>': case LEQ: case GEQ: | |
741 | lprio = LESS_PRIO; goto binop; | |
742 | case EQUAL: case NOTEQUAL: | |
743 | lprio = EQUAL_PRIO; goto binop; | |
744 | case LSH: case RSH: | |
745 | lprio = SHIFT_PRIO; goto binop; | |
746 | case '&': lprio = AND_PRIO; goto binop; | |
747 | case '^': lprio = XOR_PRIO; goto binop; | |
748 | case '|': lprio = OR_PRIO; goto binop; | |
749 | case ANDAND: lprio = ANDAND_PRIO; goto binop; | |
750 | case OROR: lprio = OROR_PRIO; goto binop; | |
751 | case ',': | |
752 | lprio = COMMA_PRIO; goto binop; | |
753 | case '(': | |
754 | lprio = PAREN_OUTER_PRIO; rprio = PAREN_INNER_PRIO; | |
755 | goto maybe_reduce; | |
756 | case ')': | |
757 | lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO; | |
758 | goto maybe_reduce; | |
759 | case ':': | |
760 | lprio = COND_PRIO; rprio = COND_PRIO; | |
761 | goto maybe_reduce; | |
762 | case '?': | |
763 | lprio = COND_PRIO + 1; rprio = COND_PRIO; | |
764 | goto maybe_reduce; | |
f13eb63a ZW |
765 | case ERROR: |
766 | goto syntax_error; | |
7f2935c7 PB |
767 | default: |
768 | cpp_error (pfile, "invalid character in #if"); | |
769 | goto syntax_error; | |
770 | } | |
771 | ||
772 | set_value: | |
0f41302f | 773 | /* Push a value onto the stack. */ |
7f2935c7 PB |
774 | if (top->flags & HAVE_VALUE) |
775 | { | |
776 | cpp_error (pfile, "syntax error in #if"); | |
777 | goto syntax_error; | |
778 | } | |
cf4ed945 ZW |
779 | top->value = op.value; |
780 | top->unsignedp = op.unsignedp; | |
7f2935c7 PB |
781 | top->flags |= HAVE_VALUE; |
782 | continue; | |
783 | ||
cf4ed945 ZW |
784 | binop: |
785 | flags = LEFT_OPERAND_REQUIRED|RIGHT_OPERAND_REQUIRED; | |
786 | rprio = lprio + 1; | |
787 | ||
7f2935c7 | 788 | maybe_reduce: |
0f41302f | 789 | /* Push an operator, and check if we can reduce now. */ |
7f2935c7 PB |
790 | while (top->rprio > lprio) |
791 | { | |
ca261cb4 | 792 | HOST_WIDEST_INT v1 = top[-1].value, v2 = top[0].value; |
7f2935c7 PB |
793 | int unsigned1 = top[-1].unsignedp, unsigned2 = top[0].unsignedp; |
794 | top--; | |
795 | if ((top[1].flags & LEFT_OPERAND_REQUIRED) | |
796 | && ! (top[0].flags & HAVE_VALUE)) | |
797 | { | |
798 | cpp_error (pfile, "syntax error - missing left operand"); | |
799 | goto syntax_error; | |
800 | } | |
801 | if ((top[1].flags & RIGHT_OPERAND_REQUIRED) | |
802 | && ! (top[1].flags & HAVE_VALUE)) | |
803 | { | |
804 | cpp_error (pfile, "syntax error - missing right operand"); | |
805 | goto syntax_error; | |
806 | } | |
807 | /* top[0].value = (top[1].op)(v1, v2);*/ | |
808 | switch (top[1].op) | |
809 | { | |
810 | case '+': | |
811 | if (!(top->flags & HAVE_VALUE)) | |
812 | { /* Unary '+' */ | |
813 | top->value = v2; | |
814 | top->unsignedp = unsigned2; | |
815 | top->flags |= HAVE_VALUE; | |
816 | } | |
817 | else | |
818 | { | |
819 | top->value = v1 + v2; | |
820 | top->unsignedp = unsigned1 || unsigned2; | |
a4a315ef | 821 | if (! top->unsignedp && ! skip_evaluation |
7f2935c7 PB |
822 | && ! possible_sum_sign (v1, v2, top->value)) |
823 | integer_overflow (pfile); | |
824 | } | |
825 | break; | |
826 | case '-': | |
52529158 | 827 | if (!(top->flags & HAVE_VALUE)) |
7f2935c7 PB |
828 | { /* Unary '-' */ |
829 | top->value = - v2; | |
52529158 | 830 | if (!skip_evaluation && (top->value & v2) < 0 && !unsigned2) |
7f2935c7 PB |
831 | integer_overflow (pfile); |
832 | top->unsignedp = unsigned2; | |
833 | top->flags |= HAVE_VALUE; | |
834 | } | |
835 | else | |
836 | { /* Binary '-' */ | |
837 | top->value = v1 - v2; | |
838 | top->unsignedp = unsigned1 || unsigned2; | |
52529158 | 839 | if (! top->unsignedp && ! skip_evaluation |
7f2935c7 PB |
840 | && ! possible_sum_sign (top->value, v2, v1)) |
841 | integer_overflow (pfile); | |
842 | } | |
843 | break; | |
844 | case '*': | |
845 | top->unsignedp = unsigned1 || unsigned2; | |
846 | if (top->unsignedp) | |
ca261cb4 | 847 | top->value = (unsigned HOST_WIDEST_INT) v1 * v2; |
a4a315ef | 848 | else if (!skip_evaluation) |
7f2935c7 PB |
849 | { |
850 | top->value = v1 * v2; | |
851 | if (v1 | |
852 | && (top->value / v1 != v2 | |
853 | || (top->value & v1 & v2) < 0)) | |
854 | integer_overflow (pfile); | |
855 | } | |
856 | break; | |
857 | case '/': | |
a4a315ef PB |
858 | if (skip_evaluation) |
859 | break; | |
7f2935c7 PB |
860 | if (v2 == 0) |
861 | { | |
862 | cpp_error (pfile, "division by zero in #if"); | |
863 | v2 = 1; | |
864 | } | |
865 | top->unsignedp = unsigned1 || unsigned2; | |
866 | if (top->unsignedp) | |
ca261cb4 | 867 | top->value = (unsigned HOST_WIDEST_INT) v1 / v2; |
7f2935c7 PB |
868 | else |
869 | { | |
870 | top->value = v1 / v2; | |
871 | if ((top->value & v1 & v2) < 0) | |
872 | integer_overflow (pfile); | |
873 | } | |
874 | break; | |
875 | case '%': | |
a4a315ef PB |
876 | if (skip_evaluation) |
877 | break; | |
7f2935c7 PB |
878 | if (v2 == 0) |
879 | { | |
880 | cpp_error (pfile, "division by zero in #if"); | |
881 | v2 = 1; | |
882 | } | |
883 | top->unsignedp = unsigned1 || unsigned2; | |
884 | if (top->unsignedp) | |
ca261cb4 | 885 | top->value = (unsigned HOST_WIDEST_INT) v1 % v2; |
7f2935c7 PB |
886 | else |
887 | top->value = v1 % v2; | |
888 | break; | |
889 | case '!': | |
890 | if (top->flags & HAVE_VALUE) | |
891 | { | |
892 | cpp_error (pfile, "syntax error"); | |
893 | goto syntax_error; | |
894 | } | |
895 | top->value = ! v2; | |
896 | top->unsignedp = 0; | |
897 | top->flags |= HAVE_VALUE; | |
898 | break; | |
899 | case '~': | |
900 | if (top->flags & HAVE_VALUE) | |
901 | { | |
902 | cpp_error (pfile, "syntax error"); | |
903 | goto syntax_error; | |
904 | } | |
905 | top->value = ~ v2; | |
906 | top->unsignedp = unsigned2; | |
907 | top->flags |= HAVE_VALUE; | |
908 | break; | |
909 | case '<': COMPARE(<); break; | |
910 | case '>': COMPARE(>); break; | |
911 | case LEQ: COMPARE(<=); break; | |
912 | case GEQ: COMPARE(>=); break; | |
913 | case EQUAL: | |
914 | top->value = (v1 == v2); | |
915 | top->unsignedp = 0; | |
916 | break; | |
917 | case NOTEQUAL: | |
918 | top->value = (v1 != v2); | |
919 | top->unsignedp = 0; | |
920 | break; | |
921 | case LSH: | |
a4a315ef PB |
922 | if (skip_evaluation) |
923 | break; | |
7f2935c7 PB |
924 | top->unsignedp = unsigned1; |
925 | if (v2 < 0 && ! unsigned2) | |
926 | top->value = right_shift (pfile, v1, unsigned1, -v2); | |
927 | else | |
928 | top->value = left_shift (pfile, v1, unsigned1, v2); | |
929 | break; | |
930 | case RSH: | |
a4a315ef PB |
931 | if (skip_evaluation) |
932 | break; | |
7f2935c7 PB |
933 | top->unsignedp = unsigned1; |
934 | if (v2 < 0 && ! unsigned2) | |
935 | top->value = left_shift (pfile, v1, unsigned1, -v2); | |
936 | else | |
937 | top->value = right_shift (pfile, v1, unsigned1, v2); | |
938 | break; | |
939 | #define LOGICAL(OP) \ | |
940 | top->value = v1 OP v2;\ | |
941 | top->unsignedp = unsigned1 || unsigned2; | |
942 | case '&': LOGICAL(&); break; | |
943 | case '^': LOGICAL(^); break; | |
944 | case '|': LOGICAL(|); break; | |
945 | case ANDAND: | |
a4a315ef PB |
946 | top->value = v1 && v2; top->unsignedp = 0; |
947 | if (!v1) skip_evaluation--; | |
948 | break; | |
7f2935c7 | 949 | case OROR: |
a4a315ef PB |
950 | top->value = v1 || v2; top->unsignedp = 0; |
951 | if (v1) skip_evaluation--; | |
952 | break; | |
7f2935c7 PB |
953 | case ',': |
954 | if (CPP_PEDANTIC (pfile)) | |
955 | cpp_pedwarn (pfile, "comma operator in operand of `#if'"); | |
956 | top->value = v2; | |
957 | top->unsignedp = unsigned2; | |
958 | break; | |
959 | case '(': case '?': | |
960 | cpp_error (pfile, "syntax error in #if"); | |
961 | goto syntax_error; | |
962 | case ':': | |
963 | if (top[0].op != '?') | |
964 | { | |
965 | cpp_error (pfile, | |
966 | "syntax error ':' without preceding '?'"); | |
967 | goto syntax_error; | |
968 | } | |
969 | else if (! (top[1].flags & HAVE_VALUE) | |
970 | || !(top[-1].flags & HAVE_VALUE) | |
971 | || !(top[0].flags & HAVE_VALUE)) | |
972 | { | |
973 | cpp_error (pfile, "bad syntax for ?: operator"); | |
974 | goto syntax_error; | |
975 | } | |
976 | else | |
977 | { | |
978 | top--; | |
a4a315ef | 979 | if (top->value) skip_evaluation--; |
7f2935c7 PB |
980 | top->value = top->value ? v1 : v2; |
981 | top->unsignedp = unsigned1 || unsigned2; | |
982 | } | |
983 | break; | |
984 | case ')': | |
985 | if ((top[1].flags & HAVE_VALUE) | |
986 | || ! (top[0].flags & HAVE_VALUE) | |
987 | || top[0].op != '(' | |
988 | || (top[-1].flags & HAVE_VALUE)) | |
989 | { | |
990 | cpp_error (pfile, "mismatched parentheses in #if"); | |
991 | goto syntax_error; | |
992 | } | |
993 | else | |
994 | { | |
995 | top--; | |
996 | top->value = v1; | |
997 | top->unsignedp = unsigned1; | |
998 | top->flags |= HAVE_VALUE; | |
999 | } | |
1000 | break; | |
1001 | default: | |
a9ae4483 ZW |
1002 | if (ISGRAPH (top[1].op)) |
1003 | cpp_error (pfile, "unimplemented operator '%c'\n", top[1].op); | |
1004 | else | |
1005 | cpp_error (pfile, "unimplemented operator '\\%03o'\n", | |
1006 | top[1].op); | |
7f2935c7 PB |
1007 | } |
1008 | } | |
1009 | if (op.op == 0) | |
1010 | { | |
1011 | if (top != stack) | |
c1212d2f | 1012 | cpp_ice (pfile, "unbalanced stack in #if expression"); |
7f2935c7 PB |
1013 | if (stack != init_stack) |
1014 | free (stack); | |
1015 | return top->value; | |
1016 | } | |
1017 | top++; | |
1018 | ||
0f41302f | 1019 | /* Check for and handle stack overflow. */ |
7f2935c7 PB |
1020 | if (top == limit) |
1021 | { | |
1022 | struct operation *new_stack; | |
0f41302f | 1023 | int old_size = (char *) limit - (char *) stack; |
7f2935c7 PB |
1024 | int new_size = 2 * old_size; |
1025 | if (stack != init_stack) | |
0f41302f | 1026 | new_stack = (struct operation *) xrealloc (stack, new_size); |
7f2935c7 PB |
1027 | else |
1028 | { | |
0f41302f | 1029 | new_stack = (struct operation *) xmalloc (new_size); |
52112c7c | 1030 | bcopy ((char *) stack, (char *) new_stack, old_size); |
7f2935c7 PB |
1031 | } |
1032 | stack = new_stack; | |
0f41302f MS |
1033 | top = (struct operation *) ((char *) new_stack + old_size); |
1034 | limit = (struct operation *) ((char *) new_stack + new_size); | |
7f2935c7 PB |
1035 | } |
1036 | ||
1037 | top->flags = flags; | |
1038 | top->rprio = rprio; | |
1039 | top->op = op.op; | |
a4a315ef PB |
1040 | if ((op.op == OROR && top[-1].value) |
1041 | || (op.op == ANDAND && !top[-1].value) | |
1042 | || (op.op == '?' && !top[-1].value)) | |
1043 | { | |
1044 | skip_evaluation++; | |
1045 | } | |
1046 | else if (op.op == ':') | |
1047 | { | |
1048 | if (top[-2].value) /* Was condition true? */ | |
1049 | skip_evaluation++; | |
1050 | else | |
1051 | skip_evaluation--; | |
1052 | } | |
7f2935c7 PB |
1053 | } |
1054 | syntax_error: | |
1055 | if (stack != init_stack) | |
1056 | free (stack); | |
7f2935c7 PB |
1057 | return 0; |
1058 | } |