forked from gcc-mirror/gcc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathexpr.c
2067 lines (1821 loc) · 55.9 KB
/
expr.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Parse C expressions for cpplib.
Copyright (C) 1987-2014 Free Software Foundation, Inc.
Contributed by Per Bothner, 1994.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "internal.h"
#define PART_PRECISION (sizeof (cpp_num_part) * CHAR_BIT)
#define HALF_MASK (~(cpp_num_part) 0 >> (PART_PRECISION / 2))
#define LOW_PART(num_part) (num_part & HALF_MASK)
#define HIGH_PART(num_part) (num_part >> (PART_PRECISION / 2))
struct op
{
const cpp_token *token; /* The token forming op (for diagnostics). */
cpp_num value; /* The value logically "right" of op. */
source_location loc; /* The location of this value. */
enum cpp_ttype op;
};
/* Some simple utility routines on double integers. */
#define num_zerop(num) ((num.low | num.high) == 0)
#define num_eq(num1, num2) (num1.low == num2.low && num1.high == num2.high)
static bool num_positive (cpp_num, size_t);
static bool num_greater_eq (cpp_num, cpp_num, size_t);
static cpp_num num_trim (cpp_num, size_t);
static cpp_num num_part_mul (cpp_num_part, cpp_num_part);
static cpp_num num_unary_op (cpp_reader *, cpp_num, enum cpp_ttype);
static cpp_num num_binary_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype);
static cpp_num num_negate (cpp_num, size_t);
static cpp_num num_bitwise_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype);
static cpp_num num_inequality_op (cpp_reader *, cpp_num, cpp_num,
enum cpp_ttype);
static cpp_num num_equality_op (cpp_reader *, cpp_num, cpp_num,
enum cpp_ttype);
static cpp_num num_mul (cpp_reader *, cpp_num, cpp_num);
static cpp_num num_div_op (cpp_reader *, cpp_num, cpp_num, enum cpp_ttype,
source_location);
static cpp_num num_lshift (cpp_num, size_t, size_t);
static cpp_num num_rshift (cpp_num, size_t, size_t);
static cpp_num append_digit (cpp_num, int, int, size_t);
static cpp_num parse_defined (cpp_reader *);
static cpp_num eval_token (cpp_reader *, const cpp_token *, source_location);
static struct op *reduce (cpp_reader *, struct op *, enum cpp_ttype);
static unsigned int interpret_float_suffix (cpp_reader *, const uchar *, size_t);
static unsigned int interpret_int_suffix (cpp_reader *, const uchar *, size_t);
static void check_promotion (cpp_reader *, const struct op *);
/* Token type abuse to create unary plus and minus operators. */
#define CPP_UPLUS ((enum cpp_ttype) (CPP_LAST_CPP_OP + 1))
#define CPP_UMINUS ((enum cpp_ttype) (CPP_LAST_CPP_OP + 2))
/* With -O2, gcc appears to produce nice code, moving the error
message load and subsequent jump completely out of the main path. */
#define SYNTAX_ERROR(msgid) \
do { cpp_error (pfile, CPP_DL_ERROR, msgid); goto syntax_error; } while(0)
#define SYNTAX_ERROR2(msgid, arg) \
do { cpp_error (pfile, CPP_DL_ERROR, msgid, arg); goto syntax_error; } \
while(0)
#define SYNTAX_ERROR_AT(loc, msgid) \
do { cpp_error_with_line (pfile, CPP_DL_ERROR, (loc), 0, msgid); goto syntax_error; } \
while(0)
#define SYNTAX_ERROR2_AT(loc, msgid, arg) \
do { cpp_error_with_line (pfile, CPP_DL_ERROR, (loc), 0, msgid, arg); goto syntax_error; } \
while(0)
/* Subroutine of cpp_classify_number. S points to a float suffix of
length LEN, possibly zero. Returns 0 for an invalid suffix, or a
flag vector describing the suffix. */
static unsigned int
interpret_float_suffix (cpp_reader *pfile, const uchar *s, size_t len)
{
size_t flags;
size_t f, d, l, w, q, i;
flags = 0;
f = d = l = w = q = i = 0;
/* Process decimal float suffixes, which are two letters starting
with d or D. Order and case are significant. */
if (len == 2 && (*s == 'd' || *s == 'D'))
{
bool uppercase = (*s == 'D');
switch (s[1])
{
case 'f': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_SMALL): 0); break;
case 'F': return (uppercase ? (CPP_N_DFLOAT | CPP_N_SMALL) : 0); break;
case 'd': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_MEDIUM): 0); break;
case 'D': return (uppercase ? (CPP_N_DFLOAT | CPP_N_MEDIUM) : 0); break;
case 'l': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_LARGE) : 0); break;
case 'L': return (uppercase ? (CPP_N_DFLOAT | CPP_N_LARGE) : 0); break;
default:
/* Additional two-character suffixes beginning with D are not
for decimal float constants. */
break;
}
}
if (CPP_OPTION (pfile, ext_numeric_literals))
{
/* Recognize a fixed-point suffix. */
if (len != 0)
switch (s[len-1])
{
case 'k': case 'K': flags = CPP_N_ACCUM; break;
case 'r': case 'R': flags = CPP_N_FRACT; break;
default: break;
}
/* Continue processing a fixed-point suffix. The suffix is case
insensitive except for ll or LL. Order is significant. */
if (flags)
{
if (len == 1)
return flags;
len--;
if (*s == 'u' || *s == 'U')
{
flags |= CPP_N_UNSIGNED;
if (len == 1)
return flags;
len--;
s++;
}
switch (*s)
{
case 'h': case 'H':
if (len == 1)
return flags |= CPP_N_SMALL;
break;
case 'l':
if (len == 1)
return flags |= CPP_N_MEDIUM;
if (len == 2 && s[1] == 'l')
return flags |= CPP_N_LARGE;
break;
case 'L':
if (len == 1)
return flags |= CPP_N_MEDIUM;
if (len == 2 && s[1] == 'L')
return flags |= CPP_N_LARGE;
break;
default:
break;
}
/* Anything left at this point is invalid. */
return 0;
}
}
/* In any remaining valid suffix, the case and order don't matter. */
while (len--)
switch (s[len])
{
case 'f': case 'F': f++; break;
case 'd': case 'D': d++; break;
case 'l': case 'L': l++; break;
case 'w': case 'W': w++; break;
case 'q': case 'Q': q++; break;
case 'i': case 'I':
case 'j': case 'J': i++; break;
default:
return 0;
}
if (f + d + l + w + q > 1 || i > 1)
return 0;
if (i && !CPP_OPTION (pfile, ext_numeric_literals))
return 0;
if ((w || q) && !CPP_OPTION (pfile, ext_numeric_literals))
return 0;
return ((i ? CPP_N_IMAGINARY : 0)
| (f ? CPP_N_SMALL :
d ? CPP_N_MEDIUM :
l ? CPP_N_LARGE :
w ? CPP_N_MD_W :
q ? CPP_N_MD_Q : CPP_N_DEFAULT));
}
/* Return the classification flags for a float suffix. */
unsigned int
cpp_interpret_float_suffix (cpp_reader *pfile, const char *s, size_t len)
{
return interpret_float_suffix (pfile, (const unsigned char *)s, len);
}
/* Subroutine of cpp_classify_number. S points to an integer suffix
of length LEN, possibly zero. Returns 0 for an invalid suffix, or a
flag vector describing the suffix. */
static unsigned int
interpret_int_suffix (cpp_reader *pfile, const uchar *s, size_t len)
{
size_t u, l, i;
u = l = i = 0;
while (len--)
switch (s[len])
{
case 'u': case 'U': u++; break;
case 'i': case 'I':
case 'j': case 'J': i++; break;
case 'l': case 'L': l++;
/* If there are two Ls, they must be adjacent and the same case. */
if (l == 2 && s[len] != s[len + 1])
return 0;
break;
default:
return 0;
}
if (l > 2 || u > 1 || i > 1)
return 0;
if (i && !CPP_OPTION (pfile, ext_numeric_literals))
return 0;
return ((i ? CPP_N_IMAGINARY : 0)
| (u ? CPP_N_UNSIGNED : 0)
| ((l == 0) ? CPP_N_SMALL
: (l == 1) ? CPP_N_MEDIUM : CPP_N_LARGE));
}
/* Return the classification flags for an int suffix. */
unsigned int
cpp_interpret_int_suffix (cpp_reader *pfile, const char *s, size_t len)
{
return interpret_int_suffix (pfile, (const unsigned char *)s, len);
}
/* Return the string type corresponding to the the input user-defined string
literal type. If the input type is not a user-defined string literal
type return the input type. */
enum cpp_ttype
cpp_userdef_string_remove_type (enum cpp_ttype type)
{
if (type == CPP_STRING_USERDEF)
return CPP_STRING;
else if (type == CPP_WSTRING_USERDEF)
return CPP_WSTRING;
else if (type == CPP_STRING16_USERDEF)
return CPP_STRING16;
else if (type == CPP_STRING32_USERDEF)
return CPP_STRING32;
else if (type == CPP_UTF8STRING_USERDEF)
return CPP_UTF8STRING;
else
return type;
}
/* Return the user-defined string literal type corresponding to the input
string type. If the input type is not a string type return the input
type. */
enum cpp_ttype
cpp_userdef_string_add_type (enum cpp_ttype type)
{
if (type == CPP_STRING)
return CPP_STRING_USERDEF;
else if (type == CPP_WSTRING)
return CPP_WSTRING_USERDEF;
else if (type == CPP_STRING16)
return CPP_STRING16_USERDEF;
else if (type == CPP_STRING32)
return CPP_STRING32_USERDEF;
else if (type == CPP_UTF8STRING)
return CPP_UTF8STRING_USERDEF;
else
return type;
}
/* Return the char type corresponding to the the input user-defined char
literal type. If the input type is not a user-defined char literal
type return the input type. */
enum cpp_ttype
cpp_userdef_char_remove_type (enum cpp_ttype type)
{
if (type == CPP_CHAR_USERDEF)
return CPP_CHAR;
else if (type == CPP_WCHAR_USERDEF)
return CPP_WCHAR;
else if (type == CPP_CHAR16_USERDEF)
return CPP_CHAR16;
else if (type == CPP_CHAR32_USERDEF)
return CPP_CHAR32;
else
return type;
}
/* Return the user-defined char literal type corresponding to the input
char type. If the input type is not a char type return the input
type. */
enum cpp_ttype
cpp_userdef_char_add_type (enum cpp_ttype type)
{
if (type == CPP_CHAR)
return CPP_CHAR_USERDEF;
else if (type == CPP_WCHAR)
return CPP_WCHAR_USERDEF;
else if (type == CPP_CHAR16)
return CPP_CHAR16_USERDEF;
else if (type == CPP_CHAR32)
return CPP_CHAR32_USERDEF;
else
return type;
}
/* Return true if the token type is a user-defined string literal. */
bool
cpp_userdef_string_p (enum cpp_ttype type)
{
if (type == CPP_STRING_USERDEF
|| type == CPP_WSTRING_USERDEF
|| type == CPP_STRING16_USERDEF
|| type == CPP_STRING32_USERDEF
|| type == CPP_UTF8STRING_USERDEF)
return true;
else
return false;
}
/* Return true if the token type is a user-defined char literal. */
bool
cpp_userdef_char_p (enum cpp_ttype type)
{
if (type == CPP_CHAR_USERDEF
|| type == CPP_WCHAR_USERDEF
|| type == CPP_CHAR16_USERDEF
|| type == CPP_CHAR32_USERDEF)
return true;
else
return false;
}
/* Extract the suffix from a user-defined literal string or char. */
const char *
cpp_get_userdef_suffix (const cpp_token *tok)
{
unsigned int len = tok->val.str.len;
const char *text = (const char *)tok->val.str.text;
char delim;
unsigned int i;
for (i = 0; i < len; ++i)
if (text[i] == '\'' || text[i] == '"')
break;
if (i == len)
return text + len;
delim = text[i];
for (i = len; i > 0; --i)
if (text[i - 1] == delim)
break;
return text + i;
}
/* Categorize numeric constants according to their field (integer,
floating point, or invalid), radix (decimal, octal, hexadecimal),
and type suffixes.
TOKEN is the token that represents the numeric constant to
classify.
In C++0X if UD_SUFFIX is non null it will be assigned
any unrecognized suffix for a user-defined literal.
VIRTUAL_LOCATION is the virtual location for TOKEN. */
unsigned int
cpp_classify_number (cpp_reader *pfile, const cpp_token *token,
const char **ud_suffix, source_location virtual_location)
{
const uchar *str = token->val.str.text;
const uchar *limit;
unsigned int max_digit, result, radix;
enum {NOT_FLOAT = 0, AFTER_POINT, AFTER_EXPON} float_flag;
bool seen_digit;
bool seen_digit_sep;
if (ud_suffix)
*ud_suffix = NULL;
/* If the lexer has done its job, length one can only be a single
digit. Fast-path this very common case. */
if (token->val.str.len == 1)
return CPP_N_INTEGER | CPP_N_SMALL | CPP_N_DECIMAL;
limit = str + token->val.str.len;
float_flag = NOT_FLOAT;
max_digit = 0;
radix = 10;
seen_digit = false;
seen_digit_sep = false;
/* First, interpret the radix. */
if (*str == '0')
{
radix = 8;
str++;
/* Require at least one hex digit to classify it as hex. */
if (*str == 'x' || *str == 'X')
{
if (str[1] == '.' || ISXDIGIT (str[1]))
{
radix = 16;
str++;
}
else if (DIGIT_SEP (str[1]))
SYNTAX_ERROR_AT (virtual_location,
"digit separator after base indicator");
}
else if (*str == 'b' || *str == 'B')
{
if (str[1] == '0' || str[1] == '1')
{
radix = 2;
str++;
}
else if (DIGIT_SEP (str[1]))
SYNTAX_ERROR_AT (virtual_location,
"digit separator after base indicator");
}
}
/* Now scan for a well-formed integer or float. */
for (;;)
{
unsigned int c = *str++;
if (ISDIGIT (c) || (ISXDIGIT (c) && radix == 16))
{
seen_digit_sep = false;
seen_digit = true;
c = hex_value (c);
if (c > max_digit)
max_digit = c;
}
else if (DIGIT_SEP (c))
{
if (seen_digit_sep)
SYNTAX_ERROR_AT (virtual_location, "adjacent digit separators");
seen_digit_sep = true;
}
else if (c == '.')
{
if (seen_digit_sep || DIGIT_SEP (*str))
SYNTAX_ERROR_AT (virtual_location,
"digit separator adjacent to decimal point");
seen_digit_sep = false;
if (float_flag == NOT_FLOAT)
float_flag = AFTER_POINT;
else
SYNTAX_ERROR_AT (virtual_location,
"too many decimal points in number");
}
else if ((radix <= 10 && (c == 'e' || c == 'E'))
|| (radix == 16 && (c == 'p' || c == 'P')))
{
if (seen_digit_sep || DIGIT_SEP (*str))
SYNTAX_ERROR_AT (virtual_location,
"digit separator adjacent to exponent");
float_flag = AFTER_EXPON;
break;
}
else
{
/* Start of suffix. */
str--;
break;
}
}
if (seen_digit_sep && float_flag != AFTER_EXPON)
SYNTAX_ERROR_AT (virtual_location,
"digit separator outside digit sequence");
/* The suffix may be for decimal fixed-point constants without exponent. */
if (radix != 16 && float_flag == NOT_FLOAT)
{
result = interpret_float_suffix (pfile, str, limit - str);
if ((result & CPP_N_FRACT) || (result & CPP_N_ACCUM))
{
result |= CPP_N_FLOATING;
/* We need to restore the radix to 10, if the radix is 8. */
if (radix == 8)
radix = 10;
if (CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"fixed-point constants are a GCC extension");
goto syntax_ok;
}
else
result = 0;
}
if (float_flag != NOT_FLOAT && radix == 8)
radix = 10;
if (max_digit >= radix)
{
if (radix == 2)
SYNTAX_ERROR2_AT (virtual_location,
"invalid digit \"%c\" in binary constant", '0' + max_digit);
else
SYNTAX_ERROR2_AT (virtual_location,
"invalid digit \"%c\" in octal constant", '0' + max_digit);
}
if (float_flag != NOT_FLOAT)
{
if (radix == 2)
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid prefix \"0b\" for floating constant");
return CPP_N_INVALID;
}
if (radix == 16 && !seen_digit)
SYNTAX_ERROR_AT (virtual_location,
"no digits in hexadecimal floating constant");
if (radix == 16 && CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, c99))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"use of C99 hexadecimal floating constant");
if (float_flag == AFTER_EXPON)
{
if (*str == '+' || *str == '-')
str++;
/* Exponent is decimal, even if string is a hex float. */
if (!ISDIGIT (*str))
{
if (DIGIT_SEP (*str))
SYNTAX_ERROR_AT (virtual_location,
"digit separator adjacent to exponent");
else
SYNTAX_ERROR_AT (virtual_location, "exponent has no digits");
}
do
{
seen_digit_sep = DIGIT_SEP (*str);
str++;
}
while (ISDIGIT (*str) || DIGIT_SEP (*str));
}
else if (radix == 16)
SYNTAX_ERROR_AT (virtual_location,
"hexadecimal floating constants require an exponent");
if (seen_digit_sep)
SYNTAX_ERROR_AT (virtual_location,
"digit separator outside digit sequence");
result = interpret_float_suffix (pfile, str, limit - str);
if (result == 0)
{
if (CPP_OPTION (pfile, user_literals))
{
if (ud_suffix)
*ud_suffix = (const char *) str;
result = CPP_N_LARGE | CPP_N_USERDEF;
}
else
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid suffix \"%.*s\" on floating constant",
(int) (limit - str), str);
return CPP_N_INVALID;
}
}
/* Traditional C didn't accept any floating suffixes. */
if (limit != str
&& CPP_WTRADITIONAL (pfile)
&& ! cpp_sys_macro_p (pfile))
cpp_warning_with_line (pfile, CPP_W_TRADITIONAL, virtual_location, 0,
"traditional C rejects the \"%.*s\" suffix",
(int) (limit - str), str);
/* A suffix for double is a GCC extension via decimal float support.
If the suffix also specifies an imaginary value we'll catch that
later. */
if ((result == CPP_N_MEDIUM) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"suffix for double constant is a GCC extension");
/* Radix must be 10 for decimal floats. */
if ((result & CPP_N_DFLOAT) && radix != 10)
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid suffix \"%.*s\" with hexadecimal floating constant",
(int) (limit - str), str);
return CPP_N_INVALID;
}
if ((result & (CPP_N_FRACT | CPP_N_ACCUM)) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"fixed-point constants are a GCC extension");
if ((result & CPP_N_DFLOAT) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"decimal float constants are a GCC extension");
result |= CPP_N_FLOATING;
}
else
{
result = interpret_int_suffix (pfile, str, limit - str);
if (result == 0)
{
if (CPP_OPTION (pfile, user_literals))
{
if (ud_suffix)
*ud_suffix = (const char *) str;
result = CPP_N_UNSIGNED | CPP_N_LARGE | CPP_N_USERDEF;
}
else
{
cpp_error_with_line (pfile, CPP_DL_ERROR, virtual_location, 0,
"invalid suffix \"%.*s\" on integer constant",
(int) (limit - str), str);
return CPP_N_INVALID;
}
}
/* Traditional C only accepted the 'L' suffix.
Suppress warning about 'LL' with -Wno-long-long. */
if (CPP_WTRADITIONAL (pfile) && ! cpp_sys_macro_p (pfile))
{
int u_or_i = (result & (CPP_N_UNSIGNED|CPP_N_IMAGINARY));
int large = (result & CPP_N_WIDTH) == CPP_N_LARGE
&& CPP_OPTION (pfile, cpp_warn_long_long);
if (u_or_i || large)
cpp_warning_with_line (pfile, large ? CPP_W_LONG_LONG : CPP_W_TRADITIONAL,
virtual_location, 0,
"traditional C rejects the \"%.*s\" suffix",
(int) (limit - str), str);
}
if ((result & CPP_N_WIDTH) == CPP_N_LARGE
&& CPP_OPTION (pfile, cpp_warn_long_long))
{
const char *message = CPP_OPTION (pfile, cplusplus)
? N_("use of C++11 long long integer constant")
: N_("use of C99 long long integer constant");
if (CPP_OPTION (pfile, c99))
cpp_warning_with_line (pfile, CPP_W_LONG_LONG, virtual_location,
0, message);
else
cpp_pedwarning_with_line (pfile, CPP_W_LONG_LONG,
virtual_location, 0, message);
}
result |= CPP_N_INTEGER;
}
syntax_ok:
if ((result & CPP_N_IMAGINARY) && CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
"imaginary constants are a GCC extension");
if (radix == 2
&& !CPP_OPTION (pfile, binary_constants)
&& CPP_PEDANTIC (pfile))
cpp_error_with_line (pfile, CPP_DL_PEDWARN, virtual_location, 0,
CPP_OPTION (pfile, cplusplus)
? "binary constants are a C++1y feature "
"or GCC extension"
: "binary constants are a GCC extension");
if (radix == 10)
result |= CPP_N_DECIMAL;
else if (radix == 16)
result |= CPP_N_HEX;
else if (radix == 2)
result |= CPP_N_BINARY;
else
result |= CPP_N_OCTAL;
return result;
syntax_error:
return CPP_N_INVALID;
}
/* cpp_interpret_integer converts an integer constant into a cpp_num,
of precision options->precision.
We do not provide any interface for decimal->float conversion,
because the preprocessor doesn't need it and we don't want to
drag in GCC's floating point emulator. */
cpp_num
cpp_interpret_integer (cpp_reader *pfile, const cpp_token *token,
unsigned int type)
{
const uchar *p, *end;
cpp_num result;
result.low = 0;
result.high = 0;
result.unsignedp = !!(type & CPP_N_UNSIGNED);
result.overflow = false;
p = token->val.str.text;
end = p + token->val.str.len;
/* Common case of a single digit. */
if (token->val.str.len == 1)
result.low = p[0] - '0';
else
{
cpp_num_part max;
size_t precision = CPP_OPTION (pfile, precision);
unsigned int base = 10, c = 0;
bool overflow = false;
if ((type & CPP_N_RADIX) == CPP_N_OCTAL)
{
base = 8;
p++;
}
else if ((type & CPP_N_RADIX) == CPP_N_HEX)
{
base = 16;
p += 2;
}
else if ((type & CPP_N_RADIX) == CPP_N_BINARY)
{
base = 2;
p += 2;
}
/* We can add a digit to numbers strictly less than this without
needing the precision and slowness of double integers. */
max = ~(cpp_num_part) 0;
if (precision < PART_PRECISION)
max >>= PART_PRECISION - precision;
max = (max - base + 1) / base + 1;
for (; p < end; p++)
{
c = *p;
if (ISDIGIT (c) || (base == 16 && ISXDIGIT (c)))
c = hex_value (c);
else if (DIGIT_SEP (c))
continue;
else
break;
/* Strict inequality for when max is set to zero. */
if (result.low < max)
result.low = result.low * base + c;
else
{
result = append_digit (result, c, base, precision);
overflow |= result.overflow;
max = 0;
}
}
if (overflow && !(type & CPP_N_USERDEF))
cpp_error (pfile, CPP_DL_PEDWARN,
"integer constant is too large for its type");
/* If too big to be signed, consider it unsigned. Only warn for
decimal numbers. Traditional numbers were always signed (but
we still honor an explicit U suffix); but we only have
traditional semantics in directives. */
else if (!result.unsignedp
&& !(CPP_OPTION (pfile, traditional)
&& pfile->state.in_directive)
&& !num_positive (result, precision))
{
/* This is for constants within the range of uintmax_t but
not that of intmax_t. For such decimal constants, a
diagnostic is required for C99 as the selected type must
be signed and not having a type is a constraint violation
(DR#298, TC3), so this must be a pedwarn. For C90,
unsigned long is specified to be used for a constant that
does not fit in signed long; if uintmax_t has the same
range as unsigned long this means only a warning is
appropriate here. C90 permits the preprocessor to use a
wider range than unsigned long in the compiler, so if
uintmax_t is wider than unsigned long no diagnostic is
required for such constants in preprocessor #if
expressions and the compiler will pedwarn for such
constants outside the range of unsigned long that reach
the compiler so a diagnostic is not required there
either; thus, pedwarn for C99 but use a plain warning for
C90. */
if (base == 10)
cpp_error (pfile, (CPP_OPTION (pfile, c99)
? CPP_DL_PEDWARN
: CPP_DL_WARNING),
"integer constant is so large that it is unsigned");
result.unsignedp = true;
}
}
return result;
}
/* Append DIGIT to NUM, a number of PRECISION bits being read in base BASE. */
static cpp_num
append_digit (cpp_num num, int digit, int base, size_t precision)
{
cpp_num result;
unsigned int shift;
bool overflow;
cpp_num_part add_high, add_low;
/* Multiply by 2, 8 or 16. Catching this overflow here means we don't
need to worry about add_high overflowing. */
switch (base)
{
case 2:
shift = 1;
break;
case 16:
shift = 4;
break;
default:
shift = 3;
}
overflow = !!(num.high >> (PART_PRECISION - shift));
result.high = num.high << shift;
result.low = num.low << shift;
result.high |= num.low >> (PART_PRECISION - shift);
result.unsignedp = num.unsignedp;
if (base == 10)
{
add_low = num.low << 1;
add_high = (num.high << 1) + (num.low >> (PART_PRECISION - 1));
}
else
add_high = add_low = 0;
if (add_low + digit < add_low)
add_high++;
add_low += digit;
if (result.low + add_low < result.low)
add_high++;
if (result.high + add_high < result.high)
overflow = true;
result.low += add_low;
result.high += add_high;
result.overflow = overflow;
/* The above code catches overflow of a cpp_num type. This catches
overflow of the (possibly shorter) target precision. */
num.low = result.low;
num.high = result.high;
result = num_trim (result, precision);
if (!num_eq (result, num))
result.overflow = true;
return result;
}
/* Handle meeting "defined" in a preprocessor expression. */
static cpp_num
parse_defined (cpp_reader *pfile)
{
cpp_num result;
int paren = 0;
cpp_hashnode *node = 0;
const cpp_token *token;
cpp_context *initial_context = pfile->context;
/* Don't expand macros. */
pfile->state.prevent_expansion++;
token = cpp_get_token (pfile);
if (token->type == CPP_OPEN_PAREN)
{
paren = 1;
token = cpp_get_token (pfile);
}
if (token->type == CPP_NAME)
{
node = token->val.node.node;
if (paren && cpp_get_token (pfile)->type != CPP_CLOSE_PAREN)
{
cpp_error (pfile, CPP_DL_ERROR, "missing ')' after \"defined\"");
node = 0;
}
}
else
{
cpp_error (pfile, CPP_DL_ERROR,
"operator \"defined\" requires an identifier");
if (token->flags & NAMED_OP)
{
cpp_token op;
op.flags = 0;
op.type = token->type;
cpp_error (pfile, CPP_DL_ERROR,
"(\"%s\" is an alternative token for \"%s\" in C++)",
cpp_token_as_text (pfile, token),
cpp_token_as_text (pfile, &op));
}
}
if (node)
{
if (pfile->context != initial_context && CPP_PEDANTIC (pfile))
cpp_error (pfile, CPP_DL_WARNING,
"this use of \"defined\" may not be portable");
_cpp_mark_macro_used (node);
if (!(node->flags & NODE_USED))
{
node->flags |= NODE_USED;
if (node->type == NT_MACRO)
{
if ((node->flags & NODE_BUILTIN)
&& pfile->cb.user_builtin_macro)
pfile->cb.user_builtin_macro (pfile, node);
if (pfile->cb.used_define)
pfile->cb.used_define (pfile, pfile->directive_line, node);
}
else
{
if (pfile->cb.used_undef)
pfile->cb.used_undef (pfile, pfile->directive_line, node);
}
}
/* A possible controlling macro of the form #if !defined ().
_cpp_parse_expr checks there was no other junk on the line. */
pfile->mi_ind_cmacro = node;
}
pfile->state.prevent_expansion--;
/* Do not treat conditional macros as being defined. This is due to the
powerpc and spu ports using conditional macros for 'vector', 'bool', and
'pixel' to act as conditional keywords. This messes up tests like #ifndef
bool. */
result.unsignedp = false;
result.high = 0;
result.overflow = false;
result.low = (node && node->type == NT_MACRO
&& (node->flags & NODE_CONDITIONAL) == 0);
return result;
}
/* Convert a token into a CPP_NUMBER (an interpreted preprocessing
number or character constant, or the result of the "defined" or "#"
operators). */
static cpp_num
eval_token (cpp_reader *pfile, const cpp_token *token,
source_location virtual_location)
{
cpp_num result;
unsigned int temp;
int unsignedp = 0;
result.unsignedp = false;
result.overflow = false;
switch (token->type)
{
case CPP_NUMBER:
temp = cpp_classify_number (pfile, token, NULL, virtual_location);
if (temp & CPP_N_USERDEF)
cpp_error (pfile, CPP_DL_ERROR,
"user-defined literal in preprocessor expression");
switch (temp & CPP_N_CATEGORY)
{