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b0699dad | 1 | /* Parse C expressions for cpplib. |
5d8ebbd8 | 2 | Copyright (C) 1987, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2001, |
ca2b05ba | 3 | 2002, 2004 Free Software Foundation. |
e38992e8 | 4 | Contributed by Per Bothner, 1994. |
7f2935c7 PB |
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, or (at your option) any | |
9 | later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
200031d1 KC |
18 | Foundation, 51 Franklin Street, Fifth Floor, |
19 | Boston, MA 02110-1301, USA. */ | |
7f2935c7 | 20 | |
7f2935c7 | 21 | #include "config.h" |
b04cd507 | 22 | #include "system.h" |
487a6e06 | 23 | #include "cpplib.h" |
4f4e53dd | 24 | #include "internal.h" |
7f2935c7 | 25 | |
91318908 NB |
26 | #define PART_PRECISION (sizeof (cpp_num_part) * CHAR_BIT) |
27 | #define HALF_MASK (~(cpp_num_part) 0 >> (PART_PRECISION / 2)) | |
28 | #define LOW_PART(num_part) (num_part & HALF_MASK) | |
29 | #define HIGH_PART(num_part) (num_part >> (PART_PRECISION / 2)) | |
30 | ||
cf00a885 | 31 | struct op |
b0699dad | 32 | { |
68e65275 | 33 | const cpp_token *token; /* The token forming op (for diagnostics). */ |
ad28cff7 | 34 | cpp_num value; /* The value logically "right" of op. */ |
cf00a885 | 35 | enum cpp_ttype op; |
7f2935c7 | 36 | }; |
7f2935c7 | 37 | |
91318908 NB |
38 | /* Some simple utility routines on double integers. */ |
39 | #define num_zerop(num) ((num.low | num.high) == 0) | |
40 | #define num_eq(num1, num2) (num1.low == num2.low && num1.high == num2.high) | |
6cf87ca4 ZW |
41 | static bool num_positive (cpp_num, size_t); |
42 | static bool num_greater_eq (cpp_num, cpp_num, size_t); | |
43 | static cpp_num num_trim (cpp_num, size_t); | |
44 | static cpp_num num_part_mul (cpp_num_part, cpp_num_part); | |
45 | ||
46 | static cpp_num num_unary_op (cpp_reader *, cpp_num, enum cpp_ttype); | |
47 | static cpp_num num_binary_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype); | |
48 | static cpp_num num_negate (cpp_num, size_t); | |
49 | static cpp_num num_bitwise_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype); | |
50 | static cpp_num num_inequality_op (cpp_reader *, cpp_num, cpp_num, | |
51 | enum cpp_ttype); | |
52 | static cpp_num num_equality_op (cpp_reader *, cpp_num, cpp_num, | |
53 | enum cpp_ttype); | |
54 | static cpp_num num_mul (cpp_reader *, cpp_num, cpp_num); | |
55 | static cpp_num num_div_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype); | |
56 | static cpp_num num_lshift (cpp_num, size_t, size_t); | |
57 | static cpp_num num_rshift (cpp_num, size_t, size_t); | |
58 | ||
59 | static cpp_num append_digit (cpp_num, int, int, size_t); | |
60 | static cpp_num parse_defined (cpp_reader *); | |
61 | static cpp_num eval_token (cpp_reader *, const cpp_token *); | |
62 | static struct op *reduce (cpp_reader *, struct op *, enum cpp_ttype); | |
63 | static unsigned int interpret_float_suffix (const uchar *, size_t); | |
64 | static unsigned int interpret_int_suffix (const uchar *, size_t); | |
65 | static void check_promotion (cpp_reader *, const struct op *); | |
91318908 | 66 | |
cd7ab83f | 67 | /* Token type abuse to create unary plus and minus operators. */ |
c3f829c1 GDR |
68 | #define CPP_UPLUS ((enum cpp_ttype) (CPP_LAST_CPP_OP + 1)) |
69 | #define CPP_UMINUS ((enum cpp_ttype) (CPP_LAST_CPP_OP + 2)) | |
cf00a885 | 70 | |
15dad1d9 ZW |
71 | /* With -O2, gcc appears to produce nice code, moving the error |
72 | message load and subsequent jump completely out of the main path. */ | |
15dad1d9 | 73 | #define SYNTAX_ERROR(msgid) \ |
0527bc4e | 74 | do { cpp_error (pfile, CPP_DL_ERROR, msgid); goto syntax_error; } while(0) |
15dad1d9 | 75 | #define SYNTAX_ERROR2(msgid, arg) \ |
0527bc4e JDA |
76 | do { cpp_error (pfile, CPP_DL_ERROR, msgid, arg); goto syntax_error; } \ |
77 | while(0) | |
15dad1d9 | 78 | |
cd7ab83f NB |
79 | /* Subroutine of cpp_classify_number. S points to a float suffix of |
80 | length LEN, possibly zero. Returns 0 for an invalid suffix, or a | |
81 | flag vector describing the suffix. */ | |
82 | static unsigned int | |
6cf87ca4 | 83 | interpret_float_suffix (const uchar *s, size_t len) |
cf00a885 | 84 | { |
ad6ed77e | 85 | size_t f = 0, l = 0, i = 0, d = 0; |
cf00a885 | 86 | |
cd7ab83f NB |
87 | while (len--) |
88 | switch (s[len]) | |
89 | { | |
30e04921 JJ |
90 | case 'f': case 'F': |
91 | if (d > 0) | |
92 | return 0; | |
93 | f++; | |
94 | break; | |
95 | case 'l': case 'L': | |
96 | if (d > 0) | |
ad6ed77e | 97 | return 0; |
30e04921 | 98 | l++; |
ad6ed77e | 99 | break; |
30e04921 JJ |
100 | case 'i': case 'I': |
101 | case 'j': case 'J': i++; break; | |
102 | case 'd': case 'D': d++; break; | |
cd7ab83f NB |
103 | default: |
104 | return 0; | |
105 | } | |
cf00a885 | 106 | |
cd7ab83f NB |
107 | if (f + l > 1 || i > 1) |
108 | return 0; | |
7f2935c7 | 109 | |
ad6ed77e JG |
110 | /* Allow dd, df, dl suffixes for decimal float constants. */ |
111 | if (d && ((d + f + l != 2) || i)) | |
112 | return 0; | |
113 | ||
cd7ab83f NB |
114 | return ((i ? CPP_N_IMAGINARY : 0) |
115 | | (f ? CPP_N_SMALL : | |
ad6ed77e JG |
116 | l ? CPP_N_LARGE : CPP_N_MEDIUM) |
117 | | (d ? CPP_N_DFLOAT : 0)); | |
cd7ab83f NB |
118 | } |
119 | ||
120 | /* Subroutine of cpp_classify_number. S points to an integer suffix | |
121 | of length LEN, possibly zero. Returns 0 for an invalid suffix, or a | |
122 | flag vector describing the suffix. */ | |
123 | static unsigned int | |
6cf87ca4 | 124 | interpret_int_suffix (const uchar *s, size_t len) |
cd7ab83f NB |
125 | { |
126 | size_t u, l, i; | |
127 | ||
128 | u = l = i = 0; | |
129 | ||
130 | while (len--) | |
131 | switch (s[len]) | |
132 | { | |
133 | case 'u': case 'U': u++; break; | |
134 | case 'i': case 'I': | |
135 | case 'j': case 'J': i++; break; | |
136 | case 'l': case 'L': l++; | |
137 | /* If there are two Ls, they must be adjacent and the same case. */ | |
138 | if (l == 2 && s[len] != s[len + 1]) | |
139 | return 0; | |
140 | break; | |
141 | default: | |
142 | return 0; | |
143 | } | |
144 | ||
145 | if (l > 2 || u > 1 || i > 1) | |
146 | return 0; | |
147 | ||
148 | return ((i ? CPP_N_IMAGINARY : 0) | |
149 | | (u ? CPP_N_UNSIGNED : 0) | |
150 | | ((l == 0) ? CPP_N_SMALL | |
151 | : (l == 1) ? CPP_N_MEDIUM : CPP_N_LARGE)); | |
152 | } | |
153 | ||
154 | /* Categorize numeric constants according to their field (integer, | |
155 | floating point, or invalid), radix (decimal, octal, hexadecimal), | |
156 | and type suffixes. */ | |
157 | unsigned int | |
6cf87ca4 | 158 | cpp_classify_number (cpp_reader *pfile, const cpp_token *token) |
cd7ab83f NB |
159 | { |
160 | const uchar *str = token->val.str.text; | |
161 | const uchar *limit; | |
162 | unsigned int max_digit, result, radix; | |
163 | enum {NOT_FLOAT = 0, AFTER_POINT, AFTER_EXPON} float_flag; | |
164 | ||
165 | /* If the lexer has done its job, length one can only be a single | |
166 | digit. Fast-path this very common case. */ | |
167 | if (token->val.str.len == 1) | |
168 | return CPP_N_INTEGER | CPP_N_SMALL | CPP_N_DECIMAL; | |
169 | ||
170 | limit = str + token->val.str.len; | |
171 | float_flag = NOT_FLOAT; | |
172 | max_digit = 0; | |
173 | radix = 10; | |
174 | ||
175 | /* First, interpret the radix. */ | |
176 | if (*str == '0') | |
177 | { | |
178 | radix = 8; | |
179 | str++; | |
180 | ||
181 | /* Require at least one hex digit to classify it as hex. */ | |
7f1fc38e MM |
182 | if ((*str == 'x' || *str == 'X') |
183 | && (str[1] == '.' || ISXDIGIT (str[1]))) | |
cd7ab83f NB |
184 | { |
185 | radix = 16; | |
186 | str++; | |
187 | } | |
188 | } | |
189 | ||
190 | /* Now scan for a well-formed integer or float. */ | |
191 | for (;;) | |
192 | { | |
193 | unsigned int c = *str++; | |
194 | ||
195 | if (ISDIGIT (c) || (ISXDIGIT (c) && radix == 16)) | |
196 | { | |
197 | c = hex_value (c); | |
198 | if (c > max_digit) | |
199 | max_digit = c; | |
200 | } | |
201 | else if (c == '.') | |
202 | { | |
203 | if (float_flag == NOT_FLOAT) | |
204 | float_flag = AFTER_POINT; | |
205 | else | |
206 | SYNTAX_ERROR ("too many decimal points in number"); | |
207 | } | |
208 | else if ((radix <= 10 && (c == 'e' || c == 'E')) | |
209 | || (radix == 16 && (c == 'p' || c == 'P'))) | |
210 | { | |
211 | float_flag = AFTER_EXPON; | |
212 | break; | |
213 | } | |
214 | else | |
215 | { | |
216 | /* Start of suffix. */ | |
217 | str--; | |
218 | break; | |
219 | } | |
220 | } | |
221 | ||
222 | if (float_flag != NOT_FLOAT && radix == 8) | |
223 | radix = 10; | |
224 | ||
225 | if (max_digit >= radix) | |
226 | SYNTAX_ERROR2 ("invalid digit \"%c\" in octal constant", '0' + max_digit); | |
227 | ||
228 | if (float_flag != NOT_FLOAT) | |
229 | { | |
230 | if (radix == 16 && CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, c99)) | |
0527bc4e | 231 | cpp_error (pfile, CPP_DL_PEDWARN, |
cd7ab83f NB |
232 | "use of C99 hexadecimal floating constant"); |
233 | ||
234 | if (float_flag == AFTER_EXPON) | |
235 | { | |
236 | if (*str == '+' || *str == '-') | |
237 | str++; | |
238 | ||
239 | /* Exponent is decimal, even if string is a hex float. */ | |
240 | if (!ISDIGIT (*str)) | |
241 | SYNTAX_ERROR ("exponent has no digits"); | |
242 | ||
243 | do | |
244 | str++; | |
245 | while (ISDIGIT (*str)); | |
246 | } | |
247 | else if (radix == 16) | |
248 | SYNTAX_ERROR ("hexadecimal floating constants require an exponent"); | |
249 | ||
250 | result = interpret_float_suffix (str, limit - str); | |
251 | if (result == 0) | |
252 | { | |
0527bc4e | 253 | cpp_error (pfile, CPP_DL_ERROR, |
cd7ab83f | 254 | "invalid suffix \"%.*s\" on floating constant", |
91b12472 | 255 | (int) (limit - str), str); |
cd7ab83f NB |
256 | return CPP_N_INVALID; |
257 | } | |
258 | ||
259 | /* Traditional C didn't accept any floating suffixes. */ | |
260 | if (limit != str | |
261 | && CPP_WTRADITIONAL (pfile) | |
262 | && ! cpp_sys_macro_p (pfile)) | |
0527bc4e | 263 | cpp_error (pfile, CPP_DL_WARNING, |
cd7ab83f | 264 | "traditional C rejects the \"%.*s\" suffix", |
91b12472 | 265 | (int) (limit - str), str); |
cd7ab83f | 266 | |
ad6ed77e JG |
267 | /* Radix must be 10 for decimal floats. */ |
268 | if ((result & CPP_N_DFLOAT) && radix != 10) | |
269 | { | |
270 | cpp_error (pfile, CPP_DL_ERROR, | |
271 | "invalid suffix \"%.*s\" with hexadecimal floating constant", | |
272 | (int) (limit - str), str); | |
273 | return CPP_N_INVALID; | |
274 | } | |
275 | ||
5a6bb57e JJ |
276 | if ((result & CPP_N_DFLOAT) && CPP_PEDANTIC (pfile)) |
277 | cpp_error (pfile, CPP_DL_PEDWARN, | |
278 | "decimal float constants are a GCC extension"); | |
279 | ||
cd7ab83f NB |
280 | result |= CPP_N_FLOATING; |
281 | } | |
282 | else | |
283 | { | |
284 | result = interpret_int_suffix (str, limit - str); | |
285 | if (result == 0) | |
286 | { | |
0527bc4e | 287 | cpp_error (pfile, CPP_DL_ERROR, |
cd7ab83f | 288 | "invalid suffix \"%.*s\" on integer constant", |
91b12472 | 289 | (int) (limit - str), str); |
cd7ab83f NB |
290 | return CPP_N_INVALID; |
291 | } | |
292 | ||
56da7207 ZW |
293 | /* Traditional C only accepted the 'L' suffix. |
294 | Suppress warning about 'LL' with -Wno-long-long. */ | |
295 | if (CPP_WTRADITIONAL (pfile) && ! cpp_sys_macro_p (pfile)) | |
296 | { | |
297 | int u_or_i = (result & (CPP_N_UNSIGNED|CPP_N_IMAGINARY)); | |
298 | int large = (result & CPP_N_WIDTH) == CPP_N_LARGE; | |
299 | ||
300 | if (u_or_i || (large && CPP_OPTION (pfile, warn_long_long))) | |
0527bc4e | 301 | cpp_error (pfile, CPP_DL_WARNING, |
56da7207 ZW |
302 | "traditional C rejects the \"%.*s\" suffix", |
303 | (int) (limit - str), str); | |
304 | } | |
cd7ab83f NB |
305 | |
306 | if ((result & CPP_N_WIDTH) == CPP_N_LARGE | |
307 | && ! CPP_OPTION (pfile, c99) | |
308 | && CPP_OPTION (pfile, warn_long_long)) | |
0527bc4e JDA |
309 | cpp_error (pfile, CPP_DL_PEDWARN, |
310 | "use of C99 long long integer constant"); | |
cd7ab83f NB |
311 | |
312 | result |= CPP_N_INTEGER; | |
313 | } | |
314 | ||
315 | if ((result & CPP_N_IMAGINARY) && CPP_PEDANTIC (pfile)) | |
0527bc4e JDA |
316 | cpp_error (pfile, CPP_DL_PEDWARN, |
317 | "imaginary constants are a GCC extension"); | |
cd7ab83f NB |
318 | |
319 | if (radix == 10) | |
320 | result |= CPP_N_DECIMAL; | |
321 | else if (radix == 16) | |
322 | result |= CPP_N_HEX; | |
323 | else | |
324 | result |= CPP_N_OCTAL; | |
325 | ||
326 | return result; | |
327 | ||
328 | syntax_error: | |
329 | return CPP_N_INVALID; | |
330 | } | |
331 | ||
332 | /* cpp_interpret_integer converts an integer constant into a cpp_num, | |
333 | of precision options->precision. | |
334 | ||
335 | We do not provide any interface for decimal->float conversion, | |
6cf87ca4 ZW |
336 | because the preprocessor doesn't need it and we don't want to |
337 | drag in GCC's floating point emulator. */ | |
cd7ab83f | 338 | cpp_num |
6cf87ca4 ZW |
339 | cpp_interpret_integer (cpp_reader *pfile, const cpp_token *token, |
340 | unsigned int type) | |
cd7ab83f NB |
341 | { |
342 | const uchar *p, *end; | |
343 | cpp_num result; | |
344 | ||
345 | result.low = 0; | |
346 | result.high = 0; | |
23ff0223 NB |
347 | result.unsignedp = !!(type & CPP_N_UNSIGNED); |
348 | result.overflow = false; | |
cd7ab83f NB |
349 | |
350 | p = token->val.str.text; | |
351 | end = p + token->val.str.len; | |
352 | ||
353 | /* Common case of a single digit. */ | |
354 | if (token->val.str.len == 1) | |
355 | result.low = p[0] - '0'; | |
356 | else | |
357 | { | |
358 | cpp_num_part max; | |
359 | size_t precision = CPP_OPTION (pfile, precision); | |
360 | unsigned int base = 10, c = 0; | |
361 | bool overflow = false; | |
362 | ||
363 | if ((type & CPP_N_RADIX) == CPP_N_OCTAL) | |
364 | { | |
365 | base = 8; | |
366 | p++; | |
367 | } | |
368 | else if ((type & CPP_N_RADIX) == CPP_N_HEX) | |
369 | { | |
370 | base = 16; | |
371 | p += 2; | |
372 | } | |
373 | ||
374 | /* We can add a digit to numbers strictly less than this without | |
375 | needing the precision and slowness of double integers. */ | |
376 | max = ~(cpp_num_part) 0; | |
377 | if (precision < PART_PRECISION) | |
378 | max >>= PART_PRECISION - precision; | |
379 | max = (max - base + 1) / base + 1; | |
380 | ||
381 | for (; p < end; p++) | |
382 | { | |
383 | c = *p; | |
384 | ||
385 | if (ISDIGIT (c) || (base == 16 && ISXDIGIT (c))) | |
386 | c = hex_value (c); | |
387 | else | |
388 | break; | |
389 | ||
390 | /* Strict inequality for when max is set to zero. */ | |
391 | if (result.low < max) | |
392 | result.low = result.low * base + c; | |
393 | else | |
394 | { | |
395 | result = append_digit (result, c, base, precision); | |
396 | overflow |= result.overflow; | |
397 | max = 0; | |
398 | } | |
399 | } | |
400 | ||
401 | if (overflow) | |
0527bc4e | 402 | cpp_error (pfile, CPP_DL_PEDWARN, |
cd7ab83f | 403 | "integer constant is too large for its type"); |
017acb41 NB |
404 | /* If too big to be signed, consider it unsigned. Only warn for |
405 | decimal numbers. Traditional numbers were always signed (but | |
8d9afc4e | 406 | we still honor an explicit U suffix); but we only have |
cd98faa1 | 407 | traditional semantics in directives. */ |
017acb41 | 408 | else if (!result.unsignedp |
cd98faa1 NB |
409 | && !(CPP_OPTION (pfile, traditional) |
410 | && pfile->state.in_directive) | |
017acb41 | 411 | && !num_positive (result, precision)) |
cd7ab83f | 412 | { |
cd7ab83f | 413 | if (base == 10) |
0527bc4e | 414 | cpp_error (pfile, CPP_DL_WARNING, |
cd7ab83f | 415 | "integer constant is so large that it is unsigned"); |
23ff0223 | 416 | result.unsignedp = true; |
cd7ab83f NB |
417 | } |
418 | } | |
419 | ||
420 | return result; | |
421 | } | |
cf00a885 | 422 | |
6cf87ca4 | 423 | /* Append DIGIT to NUM, a number of PRECISION bits being read in base BASE. */ |
91318908 | 424 | static cpp_num |
6cf87ca4 | 425 | append_digit (cpp_num num, int digit, int base, size_t precision) |
91318908 NB |
426 | { |
427 | cpp_num result; | |
428 | unsigned int shift = 3 + (base == 16); | |
429 | bool overflow; | |
430 | cpp_num_part add_high, add_low; | |
431 | ||
432 | /* Multiply by 8 or 16. Catching this overflow here means we don't | |
433 | need to worry about add_high overflowing. */ | |
23ff0223 | 434 | overflow = !!(num.high >> (PART_PRECISION - shift)); |
91318908 NB |
435 | result.high = num.high << shift; |
436 | result.low = num.low << shift; | |
437 | result.high |= num.low >> (PART_PRECISION - shift); | |
6de9cd9a | 438 | result.unsignedp = num.unsignedp; |
91318908 NB |
439 | |
440 | if (base == 10) | |
441 | { | |
442 | add_low = num.low << 1; | |
443 | add_high = (num.high << 1) + (num.low >> (PART_PRECISION - 1)); | |
444 | } | |
445 | else | |
446 | add_high = add_low = 0; | |
447 | ||
448 | if (add_low + digit < add_low) | |
449 | add_high++; | |
450 | add_low += digit; | |
22a8a52d | 451 | |
91318908 NB |
452 | if (result.low + add_low < result.low) |
453 | add_high++; | |
454 | if (result.high + add_high < result.high) | |
455 | overflow = true; | |
456 | ||
457 | result.low += add_low; | |
458 | result.high += add_high; | |
6de9cd9a | 459 | result.overflow = overflow; |
91318908 NB |
460 | |
461 | /* The above code catches overflow of a cpp_num type. This catches | |
462 | overflow of the (possibly shorter) target precision. */ | |
463 | num.low = result.low; | |
464 | num.high = result.high; | |
465 | result = num_trim (result, precision); | |
466 | if (!num_eq (result, num)) | |
6de9cd9a | 467 | result.overflow = true; |
91318908 | 468 | |
91318908 NB |
469 | return result; |
470 | } | |
471 | ||
5d8ebbd8 | 472 | /* Handle meeting "defined" in a preprocessor expression. */ |
91318908 | 473 | static cpp_num |
6cf87ca4 | 474 | parse_defined (cpp_reader *pfile) |
ba412f14 | 475 | { |
91318908 | 476 | cpp_num result; |
93c80368 NB |
477 | int paren = 0; |
478 | cpp_hashnode *node = 0; | |
4ed5bcfb | 479 | const cpp_token *token; |
63d75005 | 480 | cpp_context *initial_context = pfile->context; |
ba412f14 | 481 | |
93c80368 NB |
482 | /* Don't expand macros. */ |
483 | pfile->state.prevent_expansion++; | |
484 | ||
4ed5bcfb NB |
485 | token = cpp_get_token (pfile); |
486 | if (token->type == CPP_OPEN_PAREN) | |
ba412f14 | 487 | { |
cf00a885 | 488 | paren = 1; |
4ed5bcfb | 489 | token = cpp_get_token (pfile); |
ba412f14 ZW |
490 | } |
491 | ||
4ed5bcfb | 492 | if (token->type == CPP_NAME) |
93c80368 | 493 | { |
4ed5bcfb NB |
494 | node = token->val.node; |
495 | if (paren && cpp_get_token (pfile)->type != CPP_CLOSE_PAREN) | |
93c80368 | 496 | { |
0527bc4e | 497 | cpp_error (pfile, CPP_DL_ERROR, "missing ')' after \"defined\""); |
4ed5bcfb | 498 | node = 0; |
93c80368 NB |
499 | } |
500 | } | |
501 | else | |
3c8465d0 | 502 | { |
0527bc4e | 503 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 504 | "operator \"defined\" requires an identifier"); |
4ed5bcfb | 505 | if (token->flags & NAMED_OP) |
3c8465d0 NB |
506 | { |
507 | cpp_token op; | |
508 | ||
509 | op.flags = 0; | |
4ed5bcfb | 510 | op.type = token->type; |
0527bc4e | 511 | cpp_error (pfile, CPP_DL_ERROR, |
3c8465d0 | 512 | "(\"%s\" is an alternative token for \"%s\" in C++)", |
4ed5bcfb | 513 | cpp_token_as_text (pfile, token), |
3c8465d0 NB |
514 | cpp_token_as_text (pfile, &op)); |
515 | } | |
516 | } | |
15dad1d9 | 517 | |
91318908 | 518 | if (node) |
15dad1d9 | 519 | { |
335d03ec | 520 | if (pfile->context != initial_context && CPP_PEDANTIC (pfile)) |
0527bc4e | 521 | cpp_error (pfile, CPP_DL_WARNING, |
ebef4e8c | 522 | "this use of \"defined\" may not be portable"); |
63d75005 | 523 | |
a69cbaac NB |
524 | _cpp_mark_macro_used (node); |
525 | ||
6d18adbc NB |
526 | /* A possible controlling macro of the form #if !defined (). |
527 | _cpp_parse_expr checks there was no other junk on the line. */ | |
528 | pfile->mi_ind_cmacro = node; | |
15dad1d9 | 529 | } |
93c80368 NB |
530 | |
531 | pfile->state.prevent_expansion--; | |
91318908 | 532 | |
23ff0223 | 533 | result.unsignedp = false; |
91318908 | 534 | result.high = 0; |
23ff0223 | 535 | result.overflow = false; |
91318908 NB |
536 | result.low = node && node->type == NT_MACRO; |
537 | return result; | |
15dad1d9 ZW |
538 | } |
539 | ||
60284a59 NB |
540 | /* Convert a token into a CPP_NUMBER (an interpreted preprocessing |
541 | number or character constant, or the result of the "defined" or "#" | |
cd7ab83f | 542 | operators). */ |
91318908 | 543 | static cpp_num |
6cf87ca4 | 544 | eval_token (cpp_reader *pfile, const cpp_token *token) |
7f2935c7 | 545 | { |
91318908 | 546 | cpp_num result; |
60284a59 | 547 | unsigned int temp; |
4268e8bb | 548 | int unsignedp = 0; |
041c3194 | 549 | |
6de9cd9a DN |
550 | result.unsignedp = false; |
551 | result.overflow = false; | |
552 | ||
93c80368 | 553 | switch (token->type) |
ba412f14 | 554 | { |
7f2935c7 | 555 | case CPP_NUMBER: |
cd7ab83f NB |
556 | temp = cpp_classify_number (pfile, token); |
557 | switch (temp & CPP_N_CATEGORY) | |
558 | { | |
559 | case CPP_N_FLOATING: | |
0527bc4e | 560 | cpp_error (pfile, CPP_DL_ERROR, |
cd7ab83f NB |
561 | "floating constant in preprocessor expression"); |
562 | break; | |
563 | case CPP_N_INTEGER: | |
564 | if (!(temp & CPP_N_IMAGINARY)) | |
565 | return cpp_interpret_integer (pfile, token, temp); | |
0527bc4e | 566 | cpp_error (pfile, CPP_DL_ERROR, |
cd7ab83f NB |
567 | "imaginary number in preprocessor expression"); |
568 | break; | |
569 | ||
570 | case CPP_N_INVALID: | |
571 | /* Error already issued. */ | |
572 | break; | |
573 | } | |
574 | result.high = result.low = 0; | |
575 | break; | |
7f2f1a66 | 576 | |
cf00a885 | 577 | case CPP_WCHAR: |
4268e8bb | 578 | case CPP_CHAR: |
a5a49440 | 579 | { |
91318908 NB |
580 | cppchar_t cc = cpp_interpret_charconst (pfile, token, |
581 | &temp, &unsignedp); | |
582 | ||
583 | result.high = 0; | |
584 | result.low = cc; | |
a5a49440 | 585 | /* Sign-extend the result if necessary. */ |
91318908 NB |
586 | if (!unsignedp && (cppchar_signed_t) cc < 0) |
587 | { | |
588 | if (PART_PRECISION > BITS_PER_CPPCHAR_T) | |
589 | result.low |= ~(~(cpp_num_part) 0 | |
590 | >> (PART_PRECISION - BITS_PER_CPPCHAR_T)); | |
591 | result.high = ~(cpp_num_part) 0; | |
592 | result = num_trim (result, CPP_OPTION (pfile, precision)); | |
593 | } | |
a5a49440 | 594 | } |
60284a59 | 595 | break; |
ba412f14 | 596 | |
92936ecf | 597 | case CPP_NAME: |
93c80368 | 598 | if (token->val.node == pfile->spec_nodes.n_defined) |
63d75005 | 599 | return parse_defined (pfile); |
7d4918a2 ZW |
600 | else if (CPP_OPTION (pfile, cplusplus) |
601 | && (token->val.node == pfile->spec_nodes.n_true | |
602 | || token->val.node == pfile->spec_nodes.n_false)) | |
603 | { | |
91318908 NB |
604 | result.high = 0; |
605 | result.low = (token->val.node == pfile->spec_nodes.n_true); | |
7d4918a2 ZW |
606 | } |
607 | else | |
608 | { | |
91318908 NB |
609 | result.high = 0; |
610 | result.low = 0; | |
87ed109f | 611 | if (CPP_OPTION (pfile, warn_undef) && !pfile->state.skip_eval) |
0527bc4e | 612 | cpp_error (pfile, CPP_DL_WARNING, "\"%s\" is not defined", |
ebef4e8c | 613 | NODE_NAME (token->val.node)); |
7f2935c7 | 614 | } |
60284a59 | 615 | break; |
7f2935c7 | 616 | |
60284a59 | 617 | default: /* CPP_HASH */ |
91318908 NB |
618 | _cpp_test_assertion (pfile, &temp); |
619 | result.high = 0; | |
620 | result.low = temp; | |
93c80368 | 621 | } |
7c3bb1de | 622 | |
23ff0223 | 623 | result.unsignedp = !!unsignedp; |
91318908 | 624 | return result; |
7f2935c7 PB |
625 | } |
626 | \f | |
4063b943 | 627 | /* Operator precedence and flags table. |
dbac4aff NB |
628 | |
629 | After an operator is returned from the lexer, if it has priority less | |
87ed109f NB |
630 | than the operator on the top of the stack, we reduce the stack by one |
631 | operator and repeat the test. Since equal priorities do not reduce, | |
632 | this is naturally right-associative. | |
633 | ||
634 | We handle left-associative operators by decrementing the priority of | |
635 | just-lexed operators by one, but retaining the priority of operators | |
636 | already on the stack. | |
dbac4aff NB |
637 | |
638 | The remaining cases are '(' and ')'. We handle '(' by skipping the | |
639 | reduction phase completely. ')' is given lower priority than | |
640 | everything else, including '(', effectively forcing a reduction of the | |
272d0bee | 641 | parenthesized expression. If there is a matching '(', the routine |
87ed109f NB |
642 | reduce() exits immediately. If the normal exit route sees a ')', then |
643 | there cannot have been a matching '(' and an error message is output. | |
4063b943 | 644 | |
f8b954fc NB |
645 | The parser assumes all shifted operators require a left operand unless |
646 | the flag NO_L_OPERAND is set. These semantics are automatic; any | |
647 | extra semantics need to be handled with operator-specific code. */ | |
4063b943 | 648 | |
68e65275 NB |
649 | /* Flags. If CHECK_PROMOTION, we warn if the effective sign of an |
650 | operand changes because of integer promotions. */ | |
87ed109f NB |
651 | #define NO_L_OPERAND (1 << 0) |
652 | #define LEFT_ASSOC (1 << 1) | |
68e65275 | 653 | #define CHECK_PROMOTION (1 << 2) |
eba30526 | 654 | |
cf00a885 ZW |
655 | /* Operator to priority map. Must be in the same order as the first |
656 | N entries of enum cpp_ttype. */ | |
c3f829c1 | 657 | static const struct cpp_operator |
87ed109f | 658 | { |
60284a59 | 659 | uchar prio; |
87ed109f NB |
660 | uchar flags; |
661 | } optab[] = | |
cf00a885 | 662 | { |
ad28cff7 NB |
663 | /* EQ */ {0, 0}, /* Shouldn't happen. */ |
664 | /* NOT */ {16, NO_L_OPERAND}, | |
68e65275 NB |
665 | /* GREATER */ {12, LEFT_ASSOC | CHECK_PROMOTION}, |
666 | /* LESS */ {12, LEFT_ASSOC | CHECK_PROMOTION}, | |
667 | /* PLUS */ {14, LEFT_ASSOC | CHECK_PROMOTION}, | |
668 | /* MINUS */ {14, LEFT_ASSOC | CHECK_PROMOTION}, | |
669 | /* MULT */ {15, LEFT_ASSOC | CHECK_PROMOTION}, | |
670 | /* DIV */ {15, LEFT_ASSOC | CHECK_PROMOTION}, | |
671 | /* MOD */ {15, LEFT_ASSOC | CHECK_PROMOTION}, | |
672 | /* AND */ {9, LEFT_ASSOC | CHECK_PROMOTION}, | |
673 | /* OR */ {7, LEFT_ASSOC | CHECK_PROMOTION}, | |
674 | /* XOR */ {8, LEFT_ASSOC | CHECK_PROMOTION}, | |
ad28cff7 NB |
675 | /* RSHIFT */ {13, LEFT_ASSOC}, |
676 | /* LSHIFT */ {13, LEFT_ASSOC}, | |
677 | ||
ad28cff7 | 678 | /* COMPL */ {16, NO_L_OPERAND}, |
75aef48a NB |
679 | /* AND_AND */ {6, LEFT_ASSOC}, |
680 | /* OR_OR */ {5, LEFT_ASSOC}, | |
681 | /* QUERY */ {3, 0}, | |
68e65275 | 682 | /* COLON */ {4, LEFT_ASSOC | CHECK_PROMOTION}, |
ad28cff7 | 683 | /* COMMA */ {2, LEFT_ASSOC}, |
75aef48a | 684 | /* OPEN_PAREN */ {1, NO_L_OPERAND}, |
ad28cff7 NB |
685 | /* CLOSE_PAREN */ {0, 0}, |
686 | /* EOF */ {0, 0}, | |
687 | /* EQ_EQ */ {11, LEFT_ASSOC}, | |
688 | /* NOT_EQ */ {11, LEFT_ASSOC}, | |
68e65275 NB |
689 | /* GREATER_EQ */ {12, LEFT_ASSOC | CHECK_PROMOTION}, |
690 | /* LESS_EQ */ {12, LEFT_ASSOC | CHECK_PROMOTION}, | |
ad28cff7 NB |
691 | /* UPLUS */ {16, NO_L_OPERAND}, |
692 | /* UMINUS */ {16, NO_L_OPERAND} | |
cf00a885 ZW |
693 | }; |
694 | ||
7f2935c7 | 695 | /* Parse and evaluate a C expression, reading from PFILE. |
df383483 | 696 | Returns the truth value of the expression. |
87ed109f NB |
697 | |
698 | The implementation is an operator precedence parser, i.e. a | |
699 | bottom-up parser, using a stack for not-yet-reduced tokens. | |
700 | ||
701 | The stack base is op_stack, and the current stack pointer is 'top'. | |
702 | There is a stack element for each operator (only), and the most | |
703 | recently pushed operator is 'top->op'. An operand (value) is | |
704 | stored in the 'value' field of the stack element of the operator | |
705 | that precedes it. */ | |
706 | bool | |
6cf87ca4 | 707 | _cpp_parse_expr (cpp_reader *pfile) |
7f2935c7 | 708 | { |
87ed109f NB |
709 | struct op *top = pfile->op_stack; |
710 | unsigned int lex_count; | |
711 | bool saw_leading_not, want_value = true; | |
712 | ||
713 | pfile->state.skip_eval = 0; | |
7f2935c7 | 714 | |
93c80368 | 715 | /* Set up detection of #if ! defined(). */ |
6d18adbc | 716 | pfile->mi_ind_cmacro = 0; |
87ed109f | 717 | saw_leading_not = false; |
6d18adbc | 718 | lex_count = 0; |
93c80368 | 719 | |
87ed109f | 720 | /* Lowest priority operator prevents further reductions. */ |
cf00a885 | 721 | top->op = CPP_EOF; |
4063b943 | 722 | |
7f2935c7 PB |
723 | for (;;) |
724 | { | |
cf00a885 | 725 | struct op op; |
7f2935c7 | 726 | |
6d18adbc | 727 | lex_count++; |
68e65275 NB |
728 | op.token = cpp_get_token (pfile); |
729 | op.op = op.token->type; | |
7f2935c7 | 730 | |
7f2935c7 PB |
731 | switch (op.op) |
732 | { | |
60284a59 | 733 | /* These tokens convert into values. */ |
c60e94a7 | 734 | case CPP_NUMBER: |
60284a59 NB |
735 | case CPP_CHAR: |
736 | case CPP_WCHAR: | |
737 | case CPP_NAME: | |
738 | case CPP_HASH: | |
f8b954fc | 739 | if (!want_value) |
60284a59 | 740 | SYNTAX_ERROR2 ("missing binary operator before token \"%s\"", |
68e65275 | 741 | cpp_token_as_text (pfile, op.token)); |
f8b954fc | 742 | want_value = false; |
68e65275 | 743 | top->value = eval_token (pfile, op.token); |
9ee70313 NB |
744 | continue; |
745 | ||
6d18adbc NB |
746 | case CPP_NOT: |
747 | saw_leading_not = lex_count == 1; | |
6d18adbc | 748 | break; |
cf00a885 | 749 | case CPP_PLUS: |
f8b954fc NB |
750 | if (want_value) |
751 | op.op = CPP_UPLUS; | |
752 | break; | |
753 | case CPP_MINUS: | |
754 | if (want_value) | |
755 | op.op = CPP_UMINUS; | |
756 | break; | |
60284a59 | 757 | |
f8b954fc | 758 | default: |
60284a59 | 759 | if ((int) op.op <= (int) CPP_EQ || (int) op.op >= (int) CPP_PLUS_EQ) |
cd7ab83f | 760 | SYNTAX_ERROR2 ("token \"%s\" is not valid in preprocessor expressions", |
68e65275 | 761 | cpp_token_as_text (pfile, op.token)); |
f8b954fc | 762 | break; |
7f2935c7 | 763 | } |
7f2935c7 | 764 | |
87ed109f NB |
765 | /* Check we have a value or operator as appropriate. */ |
766 | if (optab[op.op].flags & NO_L_OPERAND) | |
7f2935c7 | 767 | { |
87ed109f | 768 | if (!want_value) |
60284a59 | 769 | SYNTAX_ERROR2 ("missing binary operator before token \"%s\"", |
68e65275 | 770 | cpp_token_as_text (pfile, op.token)); |
87ed109f NB |
771 | } |
772 | else if (want_value) | |
773 | { | |
a09d4744 NB |
774 | /* We want a number (or expression) and haven't got one. |
775 | Try to emit a specific diagnostic. */ | |
776 | if (op.op == CPP_CLOSE_PAREN && top->op == CPP_OPEN_PAREN) | |
777 | SYNTAX_ERROR ("missing expression between '(' and ')'"); | |
778 | ||
779 | if (op.op == CPP_EOF && top->op == CPP_EOF) | |
780 | SYNTAX_ERROR ("#if with no expression"); | |
781 | ||
782 | if (top->op != CPP_EOF && top->op != CPP_OPEN_PAREN) | |
783 | SYNTAX_ERROR2 ("operator '%s' has no right operand", | |
784 | cpp_token_as_text (pfile, top->token)); | |
785 | else if (op.op == CPP_CLOSE_PAREN || op.op == CPP_EOF) | |
786 | /* Complain about missing paren during reduction. */; | |
787 | else | |
788 | SYNTAX_ERROR2 ("operator '%s' has no left operand", | |
789 | cpp_token_as_text (pfile, op.token)); | |
7f2935c7 | 790 | } |
9ee70313 | 791 | |
87ed109f NB |
792 | top = reduce (pfile, top, op.op); |
793 | if (!top) | |
794 | goto syntax_error; | |
9ee70313 | 795 | |
60284a59 NB |
796 | if (op.op == CPP_EOF) |
797 | break; | |
798 | ||
87ed109f | 799 | switch (op.op) |
b22ef131 | 800 | { |
87ed109f NB |
801 | case CPP_CLOSE_PAREN: |
802 | continue; | |
87ed109f | 803 | case CPP_OR_OR: |
91318908 | 804 | if (!num_zerop (top->value)) |
87ed109f NB |
805 | pfile->state.skip_eval++; |
806 | break; | |
807 | case CPP_AND_AND: | |
808 | case CPP_QUERY: | |
91318908 | 809 | if (num_zerop (top->value)) |
87ed109f NB |
810 | pfile->state.skip_eval++; |
811 | break; | |
812 | case CPP_COLON: | |
60284a59 NB |
813 | if (top->op != CPP_QUERY) |
814 | SYNTAX_ERROR (" ':' without preceding '?'"); | |
91318908 | 815 | if (!num_zerop (top[-1].value)) /* Was '?' condition true? */ |
87ed109f NB |
816 | pfile->state.skip_eval++; |
817 | else | |
818 | pfile->state.skip_eval--; | |
819 | default: | |
820 | break; | |
4063b943 | 821 | } |
87ed109f | 822 | |
f8b954fc | 823 | want_value = true; |
4063b943 | 824 | |
0f41302f | 825 | /* Check for and handle stack overflow. */ |
87ed109f NB |
826 | if (++top == pfile->op_limit) |
827 | top = _cpp_expand_op_stack (pfile); | |
df383483 | 828 | |
7f2935c7 | 829 | top->op = op.op; |
68e65275 | 830 | top->token = op.token; |
7f2935c7 | 831 | } |
9ee70313 | 832 | |
6d18adbc NB |
833 | /* The controlling macro expression is only valid if we called lex 3 |
834 | times: <!> <defined expression> and <EOF>. push_conditional () | |
835 | checks that we are at top-of-file. */ | |
836 | if (pfile->mi_ind_cmacro && !(saw_leading_not && lex_count == 3)) | |
837 | pfile->mi_ind_cmacro = 0; | |
838 | ||
87ed109f | 839 | if (top != pfile->op_stack) |
ebef4e8c | 840 | { |
0527bc4e | 841 | cpp_error (pfile, CPP_DL_ICE, "unbalanced stack in #if"); |
4063b943 | 842 | syntax_error: |
87ed109f | 843 | return false; /* Return false on syntax error. */ |
4063b943 | 844 | } |
9ee70313 | 845 | |
91318908 | 846 | return !num_zerop (top->value); |
87ed109f NB |
847 | } |
848 | ||
849 | /* Reduce the operator / value stack if possible, in preparation for | |
850 | pushing operator OP. Returns NULL on error, otherwise the top of | |
851 | the stack. */ | |
852 | static struct op * | |
6cf87ca4 | 853 | reduce (cpp_reader *pfile, struct op *top, enum cpp_ttype op) |
87ed109f NB |
854 | { |
855 | unsigned int prio; | |
856 | ||
91318908 NB |
857 | if (top->op <= CPP_EQ || top->op > CPP_LAST_CPP_OP + 2) |
858 | { | |
859 | bad_op: | |
0527bc4e | 860 | cpp_error (pfile, CPP_DL_ICE, "impossible operator '%u'", top->op); |
91318908 NB |
861 | return 0; |
862 | } | |
863 | ||
87ed109f NB |
864 | if (op == CPP_OPEN_PAREN) |
865 | return top; | |
866 | ||
867 | /* Decrement the priority of left-associative operators to force a | |
868 | reduction with operators of otherwise equal priority. */ | |
869 | prio = optab[op].prio - ((optab[op].flags & LEFT_ASSOC) != 0); | |
870 | while (prio < optab[top->op].prio) | |
871 | { | |
68e65275 NB |
872 | if (CPP_OPTION (pfile, warn_num_sign_change) |
873 | && optab[top->op].flags & CHECK_PROMOTION) | |
874 | check_promotion (pfile, top); | |
875 | ||
75aef48a NB |
876 | switch (top->op) |
877 | { | |
878 | case CPP_UPLUS: | |
879 | case CPP_UMINUS: | |
880 | case CPP_NOT: | |
881 | case CPP_COMPL: | |
882 | top[-1].value = num_unary_op (pfile, top->value, top->op); | |
883 | break; | |
87ed109f | 884 | |
75aef48a NB |
885 | case CPP_PLUS: |
886 | case CPP_MINUS: | |
887 | case CPP_RSHIFT: | |
888 | case CPP_LSHIFT: | |
75aef48a NB |
889 | case CPP_COMMA: |
890 | top[-1].value = num_binary_op (pfile, top[-1].value, | |
891 | top->value, top->op); | |
892 | break; | |
91318908 | 893 | |
75aef48a NB |
894 | case CPP_GREATER: |
895 | case CPP_LESS: | |
896 | case CPP_GREATER_EQ: | |
897 | case CPP_LESS_EQ: | |
898 | top[-1].value | |
899 | = num_inequality_op (pfile, top[-1].value, top->value, top->op); | |
900 | break; | |
91318908 | 901 | |
75aef48a NB |
902 | case CPP_EQ_EQ: |
903 | case CPP_NOT_EQ: | |
904 | top[-1].value | |
905 | = num_equality_op (pfile, top[-1].value, top->value, top->op); | |
906 | break; | |
87ed109f | 907 | |
75aef48a NB |
908 | case CPP_AND: |
909 | case CPP_OR: | |
910 | case CPP_XOR: | |
911 | top[-1].value | |
912 | = num_bitwise_op (pfile, top[-1].value, top->value, top->op); | |
913 | break; | |
91318908 | 914 | |
75aef48a NB |
915 | case CPP_MULT: |
916 | top[-1].value = num_mul (pfile, top[-1].value, top->value); | |
917 | break; | |
ad28cff7 | 918 | |
75aef48a NB |
919 | case CPP_DIV: |
920 | case CPP_MOD: | |
921 | top[-1].value = num_div_op (pfile, top[-1].value, | |
922 | top->value, top->op); | |
923 | break; | |
ad28cff7 | 924 | |
75aef48a NB |
925 | case CPP_OR_OR: |
926 | top--; | |
927 | if (!num_zerop (top->value)) | |
928 | pfile->state.skip_eval--; | |
929 | top->value.low = (!num_zerop (top->value) | |
930 | || !num_zerop (top[1].value)); | |
931 | top->value.high = 0; | |
932 | top->value.unsignedp = false; | |
933 | top->value.overflow = false; | |
934 | continue; | |
935 | ||
936 | case CPP_AND_AND: | |
937 | top--; | |
938 | if (num_zerop (top->value)) | |
939 | pfile->state.skip_eval--; | |
940 | top->value.low = (!num_zerop (top->value) | |
941 | && !num_zerop (top[1].value)); | |
942 | top->value.high = 0; | |
943 | top->value.unsignedp = false; | |
944 | top->value.overflow = false; | |
945 | continue; | |
946 | ||
947 | case CPP_OPEN_PAREN: | |
948 | if (op != CPP_CLOSE_PAREN) | |
949 | { | |
0527bc4e | 950 | cpp_error (pfile, CPP_DL_ERROR, "missing ')' in expression"); |
75aef48a NB |
951 | return 0; |
952 | } | |
953 | top--; | |
954 | top->value = top[1].value; | |
955 | return top; | |
956 | ||
957 | case CPP_COLON: | |
958 | top -= 2; | |
959 | if (!num_zerop (top->value)) | |
960 | { | |
ad28cff7 | 961 | pfile->state.skip_eval--; |
75aef48a NB |
962 | top->value = top[1].value; |
963 | } | |
964 | else | |
965 | top->value = top[2].value; | |
966 | top->value.unsignedp = (top[1].value.unsignedp | |
967 | || top[2].value.unsignedp); | |
968 | continue; | |
969 | ||
970 | case CPP_QUERY: | |
0527bc4e | 971 | cpp_error (pfile, CPP_DL_ERROR, "'?' without following ':'"); |
75aef48a NB |
972 | return 0; |
973 | ||
974 | default: | |
975 | goto bad_op; | |
976 | } | |
91318908 | 977 | |
ad28cff7 | 978 | top--; |
91318908 | 979 | if (top->value.overflow && !pfile->state.skip_eval) |
0527bc4e | 980 | cpp_error (pfile, CPP_DL_PEDWARN, |
91318908 | 981 | "integer overflow in preprocessor expression"); |
87ed109f NB |
982 | } |
983 | ||
984 | if (op == CPP_CLOSE_PAREN) | |
985 | { | |
0527bc4e | 986 | cpp_error (pfile, CPP_DL_ERROR, "missing '(' in expression"); |
87ed109f NB |
987 | return 0; |
988 | } | |
989 | ||
990 | return top; | |
991 | } | |
992 | ||
993 | /* Returns the position of the old top of stack after expansion. */ | |
994 | struct op * | |
6cf87ca4 | 995 | _cpp_expand_op_stack (cpp_reader *pfile) |
87ed109f | 996 | { |
32fa4565 NB |
997 | size_t old_size = (size_t) (pfile->op_limit - pfile->op_stack); |
998 | size_t new_size = old_size * 2 + 20; | |
87ed109f | 999 | |
c3f829c1 | 1000 | pfile->op_stack = XRESIZEVEC (struct op, pfile->op_stack, new_size); |
32fa4565 | 1001 | pfile->op_limit = pfile->op_stack + new_size; |
87ed109f | 1002 | |
32fa4565 | 1003 | return pfile->op_stack + old_size; |
7f2935c7 | 1004 | } |
91318908 | 1005 | |
68e65275 NB |
1006 | /* Emits a warning if the effective sign of either operand of OP |
1007 | changes because of integer promotions. */ | |
1008 | static void | |
6cf87ca4 | 1009 | check_promotion (cpp_reader *pfile, const struct op *op) |
68e65275 NB |
1010 | { |
1011 | if (op->value.unsignedp == op[-1].value.unsignedp) | |
1012 | return; | |
1013 | ||
1014 | if (op->value.unsignedp) | |
1015 | { | |
1016 | if (!num_positive (op[-1].value, CPP_OPTION (pfile, precision))) | |
0527bc4e | 1017 | cpp_error (pfile, CPP_DL_WARNING, |
68e65275 NB |
1018 | "the left operand of \"%s\" changes sign when promoted", |
1019 | cpp_token_as_text (pfile, op->token)); | |
1020 | } | |
1021 | else if (!num_positive (op->value, CPP_OPTION (pfile, precision))) | |
0527bc4e | 1022 | cpp_error (pfile, CPP_DL_WARNING, |
68e65275 NB |
1023 | "the right operand of \"%s\" changes sign when promoted", |
1024 | cpp_token_as_text (pfile, op->token)); | |
1025 | } | |
1026 | ||
91318908 NB |
1027 | /* Clears the unused high order bits of the number pointed to by PNUM. */ |
1028 | static cpp_num | |
6cf87ca4 | 1029 | num_trim (cpp_num num, size_t precision) |
91318908 NB |
1030 | { |
1031 | if (precision > PART_PRECISION) | |
1032 | { | |
1033 | precision -= PART_PRECISION; | |
1034 | if (precision < PART_PRECISION) | |
359b0bec | 1035 | num.high &= ((cpp_num_part) 1 << precision) - 1; |
91318908 NB |
1036 | } |
1037 | else | |
1038 | { | |
1039 | if (precision < PART_PRECISION) | |
359b0bec | 1040 | num.low &= ((cpp_num_part) 1 << precision) - 1; |
91318908 NB |
1041 | num.high = 0; |
1042 | } | |
1043 | ||
1044 | return num; | |
1045 | } | |
1046 | ||
1047 | /* True iff A (presumed signed) >= 0. */ | |
1048 | static bool | |
6cf87ca4 | 1049 | num_positive (cpp_num num, size_t precision) |
91318908 NB |
1050 | { |
1051 | if (precision > PART_PRECISION) | |
1052 | { | |
1053 | precision -= PART_PRECISION; | |
359b0bec | 1054 | return (num.high & (cpp_num_part) 1 << (precision - 1)) == 0; |
91318908 NB |
1055 | } |
1056 | ||
359b0bec | 1057 | return (num.low & (cpp_num_part) 1 << (precision - 1)) == 0; |
91318908 NB |
1058 | } |
1059 | ||
ceeedfc1 NB |
1060 | /* Sign extend a number, with PRECISION significant bits and all |
1061 | others assumed clear, to fill out a cpp_num structure. */ | |
1062 | cpp_num | |
6cf87ca4 | 1063 | cpp_num_sign_extend (cpp_num num, size_t precision) |
ceeedfc1 NB |
1064 | { |
1065 | if (!num.unsignedp) | |
1066 | { | |
1067 | if (precision > PART_PRECISION) | |
1068 | { | |
1069 | precision -= PART_PRECISION; | |
1070 | if (precision < PART_PRECISION | |
1071 | && (num.high & (cpp_num_part) 1 << (precision - 1))) | |
1072 | num.high |= ~(~(cpp_num_part) 0 >> (PART_PRECISION - precision)); | |
1073 | } | |
1074 | else if (num.low & (cpp_num_part) 1 << (precision - 1)) | |
1075 | { | |
1076 | if (precision < PART_PRECISION) | |
1077 | num.low |= ~(~(cpp_num_part) 0 >> (PART_PRECISION - precision)); | |
1078 | num.high = ~(cpp_num_part) 0; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | return num; | |
1083 | } | |
1084 | ||
91318908 NB |
1085 | /* Returns the negative of NUM. */ |
1086 | static cpp_num | |
6cf87ca4 | 1087 | num_negate (cpp_num num, size_t precision) |
91318908 NB |
1088 | { |
1089 | cpp_num copy; | |
1090 | ||
1091 | copy = num; | |
1092 | num.high = ~num.high; | |
1093 | num.low = ~num.low; | |
1094 | if (++num.low == 0) | |
1095 | num.high++; | |
1096 | num = num_trim (num, precision); | |
1097 | num.overflow = (!num.unsignedp && num_eq (num, copy) && !num_zerop (num)); | |
1098 | ||
1099 | return num; | |
1100 | } | |
1101 | ||
1102 | /* Returns true if A >= B. */ | |
1103 | static bool | |
6cf87ca4 | 1104 | num_greater_eq (cpp_num pa, cpp_num pb, size_t precision) |
91318908 NB |
1105 | { |
1106 | bool unsignedp; | |
1107 | ||
1108 | unsignedp = pa.unsignedp || pb.unsignedp; | |
1109 | ||
1110 | if (!unsignedp) | |
1111 | { | |
1112 | /* Both numbers have signed type. If they are of different | |
1113 | sign, the answer is the sign of A. */ | |
1114 | unsignedp = num_positive (pa, precision); | |
1115 | ||
1116 | if (unsignedp != num_positive (pb, precision)) | |
1117 | return unsignedp; | |
1118 | ||
1119 | /* Otherwise we can do an unsigned comparison. */ | |
1120 | } | |
1121 | ||
1122 | return (pa.high > pb.high) || (pa.high == pb.high && pa.low >= pb.low); | |
1123 | } | |
1124 | ||
1125 | /* Returns LHS OP RHS, where OP is a bit-wise operation. */ | |
1126 | static cpp_num | |
6cf87ca4 ZW |
1127 | num_bitwise_op (cpp_reader *pfile ATTRIBUTE_UNUSED, |
1128 | cpp_num lhs, cpp_num rhs, enum cpp_ttype op) | |
91318908 NB |
1129 | { |
1130 | lhs.overflow = false; | |
1131 | lhs.unsignedp = lhs.unsignedp || rhs.unsignedp; | |
1132 | ||
1133 | /* As excess precision is zeroed, there is no need to num_trim () as | |
1134 | these operations cannot introduce a set bit there. */ | |
1135 | if (op == CPP_AND) | |
1136 | { | |
1137 | lhs.low &= rhs.low; | |
1138 | lhs.high &= rhs.high; | |
1139 | } | |
1140 | else if (op == CPP_OR) | |
1141 | { | |
1142 | lhs.low |= rhs.low; | |
1143 | lhs.high |= rhs.high; | |
1144 | } | |
1145 | else | |
1146 | { | |
1147 | lhs.low ^= rhs.low; | |
1148 | lhs.high ^= rhs.high; | |
1149 | } | |
1150 | ||
1151 | return lhs; | |
1152 | } | |
1153 | ||
1154 | /* Returns LHS OP RHS, where OP is an inequality. */ | |
1155 | static cpp_num | |
6cf87ca4 ZW |
1156 | num_inequality_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, |
1157 | enum cpp_ttype op) | |
91318908 NB |
1158 | { |
1159 | bool gte = num_greater_eq (lhs, rhs, CPP_OPTION (pfile, precision)); | |
1160 | ||
1161 | if (op == CPP_GREATER_EQ) | |
1162 | lhs.low = gte; | |
1163 | else if (op == CPP_LESS) | |
1164 | lhs.low = !gte; | |
1165 | else if (op == CPP_GREATER) | |
1166 | lhs.low = gte && !num_eq (lhs, rhs); | |
1167 | else /* CPP_LESS_EQ. */ | |
1168 | lhs.low = !gte || num_eq (lhs, rhs); | |
1169 | ||
1170 | lhs.high = 0; | |
1171 | lhs.overflow = false; | |
1172 | lhs.unsignedp = false; | |
1173 | return lhs; | |
1174 | } | |
1175 | ||
1176 | /* Returns LHS OP RHS, where OP is == or !=. */ | |
1177 | static cpp_num | |
6cf87ca4 ZW |
1178 | num_equality_op (cpp_reader *pfile ATTRIBUTE_UNUSED, |
1179 | cpp_num lhs, cpp_num rhs, enum cpp_ttype op) | |
91318908 | 1180 | { |
97459791 JM |
1181 | /* Work around a 3.0.4 bug; see PR 6950. */ |
1182 | bool eq = num_eq (lhs, rhs); | |
91318908 | 1183 | if (op == CPP_NOT_EQ) |
97459791 JM |
1184 | eq = !eq; |
1185 | lhs.low = eq; | |
91318908 NB |
1186 | lhs.high = 0; |
1187 | lhs.overflow = false; | |
1188 | lhs.unsignedp = false; | |
1189 | return lhs; | |
1190 | } | |
1191 | ||
1192 | /* Shift NUM, of width PRECISION, right by N bits. */ | |
1193 | static cpp_num | |
6cf87ca4 | 1194 | num_rshift (cpp_num num, size_t precision, size_t n) |
91318908 NB |
1195 | { |
1196 | cpp_num_part sign_mask; | |
6de9cd9a | 1197 | bool x = num_positive (num, precision); |
91318908 | 1198 | |
6de9cd9a | 1199 | if (num.unsignedp || x) |
91318908 NB |
1200 | sign_mask = 0; |
1201 | else | |
1202 | sign_mask = ~(cpp_num_part) 0; | |
1203 | ||
1204 | if (n >= precision) | |
1205 | num.high = num.low = sign_mask; | |
1206 | else | |
1207 | { | |
1208 | /* Sign-extend. */ | |
1209 | if (precision < PART_PRECISION) | |
1210 | num.high = sign_mask, num.low |= sign_mask << precision; | |
1211 | else if (precision < 2 * PART_PRECISION) | |
1212 | num.high |= sign_mask << (precision - PART_PRECISION); | |
1213 | ||
1214 | if (n >= PART_PRECISION) | |
1215 | { | |
1216 | n -= PART_PRECISION; | |
1217 | num.low = num.high; | |
1218 | num.high = sign_mask; | |
1219 | } | |
1220 | ||
1221 | if (n) | |
1222 | { | |
1223 | num.low = (num.low >> n) | (num.high << (PART_PRECISION - n)); | |
1224 | num.high = (num.high >> n) | (sign_mask << (PART_PRECISION - n)); | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | num = num_trim (num, precision); | |
1229 | num.overflow = false; | |
1230 | return num; | |
1231 | } | |
1232 | ||
1233 | /* Shift NUM, of width PRECISION, left by N bits. */ | |
1234 | static cpp_num | |
6cf87ca4 | 1235 | num_lshift (cpp_num num, size_t precision, size_t n) |
91318908 NB |
1236 | { |
1237 | if (n >= precision) | |
1238 | { | |
1239 | num.overflow = !num.unsignedp && !num_zerop (num); | |
1240 | num.high = num.low = 0; | |
1241 | } | |
1242 | else | |
1243 | { | |
1244 | cpp_num orig, maybe_orig; | |
1245 | size_t m = n; | |
1246 | ||
1247 | orig = num; | |
1248 | if (m >= PART_PRECISION) | |
1249 | { | |
1250 | m -= PART_PRECISION; | |
1251 | num.high = num.low; | |
1252 | num.low = 0; | |
1253 | } | |
1254 | if (m) | |
1255 | { | |
1256 | num.high = (num.high << m) | (num.low >> (PART_PRECISION - m)); | |
1257 | num.low <<= m; | |
1258 | } | |
1259 | num = num_trim (num, precision); | |
1260 | ||
1261 | if (num.unsignedp) | |
1262 | num.overflow = false; | |
1263 | else | |
1264 | { | |
1265 | maybe_orig = num_rshift (num, precision, n); | |
1266 | num.overflow = !num_eq (orig, maybe_orig); | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | return num; | |
1271 | } | |
1272 | ||
1273 | /* The four unary operators: +, -, ! and ~. */ | |
1274 | static cpp_num | |
6cf87ca4 | 1275 | num_unary_op (cpp_reader *pfile, cpp_num num, enum cpp_ttype op) |
91318908 NB |
1276 | { |
1277 | switch (op) | |
1278 | { | |
1279 | case CPP_UPLUS: | |
75aef48a | 1280 | if (CPP_WTRADITIONAL (pfile) && !pfile->state.skip_eval) |
0527bc4e | 1281 | cpp_error (pfile, CPP_DL_WARNING, |
91318908 NB |
1282 | "traditional C rejects the unary plus operator"); |
1283 | num.overflow = false; | |
1284 | break; | |
1285 | ||
1286 | case CPP_UMINUS: | |
1287 | num = num_negate (num, CPP_OPTION (pfile, precision)); | |
1288 | break; | |
1289 | ||
1290 | case CPP_COMPL: | |
1291 | num.high = ~num.high; | |
1292 | num.low = ~num.low; | |
1293 | num = num_trim (num, CPP_OPTION (pfile, precision)); | |
1294 | num.overflow = false; | |
1295 | break; | |
1296 | ||
1297 | default: /* case CPP_NOT: */ | |
1298 | num.low = num_zerop (num); | |
1299 | num.high = 0; | |
1300 | num.overflow = false; | |
1301 | num.unsignedp = false; | |
1302 | break; | |
1303 | } | |
1304 | ||
1305 | return num; | |
1306 | } | |
1307 | ||
1308 | /* The various binary operators. */ | |
1309 | static cpp_num | |
6cf87ca4 | 1310 | num_binary_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, enum cpp_ttype op) |
91318908 NB |
1311 | { |
1312 | cpp_num result; | |
1313 | size_t precision = CPP_OPTION (pfile, precision); | |
91318908 NB |
1314 | size_t n; |
1315 | ||
1316 | switch (op) | |
1317 | { | |
1318 | /* Shifts. */ | |
1319 | case CPP_LSHIFT: | |
1320 | case CPP_RSHIFT: | |
1321 | if (!rhs.unsignedp && !num_positive (rhs, precision)) | |
1322 | { | |
1323 | /* A negative shift is a positive shift the other way. */ | |
1324 | if (op == CPP_LSHIFT) | |
1325 | op = CPP_RSHIFT; | |
1326 | else | |
1327 | op = CPP_LSHIFT; | |
1328 | rhs = num_negate (rhs, precision); | |
1329 | } | |
1330 | if (rhs.high) | |
1331 | n = ~0; /* Maximal. */ | |
1332 | else | |
1333 | n = rhs.low; | |
1334 | if (op == CPP_LSHIFT) | |
1335 | lhs = num_lshift (lhs, precision, n); | |
1336 | else | |
1337 | lhs = num_rshift (lhs, precision, n); | |
1338 | break; | |
1339 | ||
91318908 NB |
1340 | /* Arithmetic. */ |
1341 | case CPP_MINUS: | |
1342 | rhs = num_negate (rhs, precision); | |
1343 | case CPP_PLUS: | |
1344 | result.low = lhs.low + rhs.low; | |
1345 | result.high = lhs.high + rhs.high; | |
1346 | if (result.low < lhs.low) | |
1347 | result.high++; | |
6de9cd9a DN |
1348 | result.unsignedp = lhs.unsignedp || rhs.unsignedp; |
1349 | result.overflow = false; | |
91318908 NB |
1350 | |
1351 | result = num_trim (result, precision); | |
6de9cd9a | 1352 | if (!result.unsignedp) |
91318908 NB |
1353 | { |
1354 | bool lhsp = num_positive (lhs, precision); | |
1355 | result.overflow = (lhsp == num_positive (rhs, precision) | |
1356 | && lhsp != num_positive (result, precision)); | |
1357 | } | |
1358 | return result; | |
1359 | ||
1360 | /* Comma. */ | |
1361 | default: /* case CPP_COMMA: */ | |
32e8aa9a JM |
1362 | if (CPP_PEDANTIC (pfile) && (!CPP_OPTION (pfile, c99) |
1363 | || !pfile->state.skip_eval)) | |
0527bc4e | 1364 | cpp_error (pfile, CPP_DL_PEDWARN, |
91318908 NB |
1365 | "comma operator in operand of #if"); |
1366 | lhs = rhs; | |
1367 | break; | |
1368 | } | |
1369 | ||
1370 | return lhs; | |
1371 | } | |
1372 | ||
1373 | /* Multiplies two unsigned cpp_num_parts to give a cpp_num. This | |
1374 | cannot overflow. */ | |
1375 | static cpp_num | |
6cf87ca4 | 1376 | num_part_mul (cpp_num_part lhs, cpp_num_part rhs) |
91318908 NB |
1377 | { |
1378 | cpp_num result; | |
1379 | cpp_num_part middle[2], temp; | |
1380 | ||
1381 | result.low = LOW_PART (lhs) * LOW_PART (rhs); | |
1382 | result.high = HIGH_PART (lhs) * HIGH_PART (rhs); | |
1383 | ||
1384 | middle[0] = LOW_PART (lhs) * HIGH_PART (rhs); | |
1385 | middle[1] = HIGH_PART (lhs) * LOW_PART (rhs); | |
1386 | ||
1387 | temp = result.low; | |
1388 | result.low += LOW_PART (middle[0]) << (PART_PRECISION / 2); | |
1389 | if (result.low < temp) | |
1390 | result.high++; | |
1391 | ||
1392 | temp = result.low; | |
1393 | result.low += LOW_PART (middle[1]) << (PART_PRECISION / 2); | |
1394 | if (result.low < temp) | |
1395 | result.high++; | |
1396 | ||
1397 | result.high += HIGH_PART (middle[0]); | |
1398 | result.high += HIGH_PART (middle[1]); | |
6de9cd9a DN |
1399 | result.unsignedp = true; |
1400 | result.overflow = false; | |
91318908 NB |
1401 | |
1402 | return result; | |
1403 | } | |
1404 | ||
1405 | /* Multiply two preprocessing numbers. */ | |
1406 | static cpp_num | |
6cf87ca4 | 1407 | num_mul (cpp_reader *pfile, cpp_num lhs, cpp_num rhs) |
91318908 NB |
1408 | { |
1409 | cpp_num result, temp; | |
1410 | bool unsignedp = lhs.unsignedp || rhs.unsignedp; | |
1411 | bool overflow, negate = false; | |
1412 | size_t precision = CPP_OPTION (pfile, precision); | |
1413 | ||
1414 | /* Prepare for unsigned multiplication. */ | |
1415 | if (!unsignedp) | |
1416 | { | |
1417 | if (!num_positive (lhs, precision)) | |
1418 | negate = !negate, lhs = num_negate (lhs, precision); | |
1419 | if (!num_positive (rhs, precision)) | |
1420 | negate = !negate, rhs = num_negate (rhs, precision); | |
1421 | } | |
1422 | ||
1423 | overflow = lhs.high && rhs.high; | |
1424 | result = num_part_mul (lhs.low, rhs.low); | |
1425 | ||
1426 | temp = num_part_mul (lhs.high, rhs.low); | |
1427 | result.high += temp.low; | |
1428 | if (temp.high) | |
1429 | overflow = true; | |
1430 | ||
1431 | temp = num_part_mul (lhs.low, rhs.high); | |
1432 | result.high += temp.low; | |
1433 | if (temp.high) | |
1434 | overflow = true; | |
1435 | ||
1436 | temp.low = result.low, temp.high = result.high; | |
1437 | result = num_trim (result, precision); | |
1438 | if (!num_eq (result, temp)) | |
1439 | overflow = true; | |
1440 | ||
1441 | if (negate) | |
1442 | result = num_negate (result, precision); | |
1443 | ||
1444 | if (unsignedp) | |
1445 | result.overflow = false; | |
1446 | else | |
1447 | result.overflow = overflow || (num_positive (result, precision) ^ !negate | |
1448 | && !num_zerop (result)); | |
1449 | result.unsignedp = unsignedp; | |
1450 | ||
1451 | return result; | |
1452 | } | |
1453 | ||
1454 | /* Divide two preprocessing numbers, returning the answer or the | |
1455 | remainder depending upon OP. */ | |
1456 | static cpp_num | |
6cf87ca4 | 1457 | num_div_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, enum cpp_ttype op) |
91318908 NB |
1458 | { |
1459 | cpp_num result, sub; | |
1460 | cpp_num_part mask; | |
1461 | bool unsignedp = lhs.unsignedp || rhs.unsignedp; | |
1462 | bool negate = false, lhs_neg = false; | |
1463 | size_t i, precision = CPP_OPTION (pfile, precision); | |
1464 | ||
1465 | /* Prepare for unsigned division. */ | |
1466 | if (!unsignedp) | |
1467 | { | |
1468 | if (!num_positive (lhs, precision)) | |
1469 | negate = !negate, lhs_neg = true, lhs = num_negate (lhs, precision); | |
1470 | if (!num_positive (rhs, precision)) | |
1471 | negate = !negate, rhs = num_negate (rhs, precision); | |
1472 | } | |
1473 | ||
1474 | /* Find the high bit. */ | |
1475 | if (rhs.high) | |
1476 | { | |
1477 | i = precision - 1; | |
359b0bec | 1478 | mask = (cpp_num_part) 1 << (i - PART_PRECISION); |
91318908 NB |
1479 | for (; ; i--, mask >>= 1) |
1480 | if (rhs.high & mask) | |
1481 | break; | |
1482 | } | |
1483 | else if (rhs.low) | |
1484 | { | |
1485 | if (precision > PART_PRECISION) | |
1486 | i = precision - PART_PRECISION - 1; | |
1487 | else | |
1488 | i = precision - 1; | |
359b0bec | 1489 | mask = (cpp_num_part) 1 << i; |
91318908 NB |
1490 | for (; ; i--, mask >>= 1) |
1491 | if (rhs.low & mask) | |
1492 | break; | |
1493 | } | |
1494 | else | |
1495 | { | |
75aef48a | 1496 | if (!pfile->state.skip_eval) |
0527bc4e | 1497 | cpp_error (pfile, CPP_DL_ERROR, "division by zero in #if"); |
91318908 NB |
1498 | return lhs; |
1499 | } | |
1500 | ||
da7d8304 | 1501 | /* First nonzero bit of RHS is bit I. Do naive division by |
91318908 NB |
1502 | shifting the RHS fully left, and subtracting from LHS if LHS is |
1503 | at least as big, and then repeating but with one less shift. | |
1504 | This is not very efficient, but is easy to understand. */ | |
1505 | ||
1506 | rhs.unsignedp = true; | |
1507 | lhs.unsignedp = true; | |
1508 | i = precision - i - 1; | |
1509 | sub = num_lshift (rhs, precision, i); | |
1510 | ||
1511 | result.high = result.low = 0; | |
1512 | for (;;) | |
1513 | { | |
1514 | if (num_greater_eq (lhs, sub, precision)) | |
1515 | { | |
1516 | lhs = num_binary_op (pfile, lhs, sub, CPP_MINUS); | |
1517 | if (i >= PART_PRECISION) | |
359b0bec | 1518 | result.high |= (cpp_num_part) 1 << (i - PART_PRECISION); |
91318908 | 1519 | else |
359b0bec | 1520 | result.low |= (cpp_num_part) 1 << i; |
91318908 NB |
1521 | } |
1522 | if (i-- == 0) | |
1523 | break; | |
1524 | sub.low = (sub.low >> 1) | (sub.high << (PART_PRECISION - 1)); | |
1525 | sub.high >>= 1; | |
1526 | } | |
1527 | ||
1528 | /* We divide so that the remainder has the sign of the LHS. */ | |
1529 | if (op == CPP_DIV) | |
1530 | { | |
1531 | result.unsignedp = unsignedp; | |
6de9cd9a DN |
1532 | result.overflow = false; |
1533 | if (!unsignedp) | |
91318908 NB |
1534 | { |
1535 | if (negate) | |
1536 | result = num_negate (result, precision); | |
22a8a52d EC |
1537 | result.overflow = (num_positive (result, precision) ^ !negate |
1538 | && !num_zerop (result)); | |
91318908 NB |
1539 | } |
1540 | ||
1541 | return result; | |
1542 | } | |
1543 | ||
1544 | /* CPP_MOD. */ | |
1545 | lhs.unsignedp = unsignedp; | |
1546 | lhs.overflow = false; | |
1547 | if (lhs_neg) | |
1548 | lhs = num_negate (lhs, precision); | |
1549 | ||
1550 | return lhs; | |
1551 | } |