2 * Copyright (C) 2012 Oracle.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
19 * Basically the point of sval is that it can hold both ULLONG_MAX and
20 * LLONG_MIN. If it is an unsigned type then we use sval.uvalue or if it is
21 * signed we use sval.value.
23 * I considered just using one bit to store whether the value was signed vs
24 * unsigned but I think it might help to have the type information so we know
25 * how to do type promotion.
30 #include "smatch_slist.h"
31 #include "smatch_extra.h"
33 __ALLOCATOR(sval_t
, "svals", sval
);
35 sval_t
*sval_alloc(sval_t sval
)
39 ret
= __alloc_sval(0);
44 sval_t
*sval_alloc_permanent(sval_t sval
)
48 ret
= malloc(sizeof(*ret
));
53 sval_t
sval_blank(struct expression
*expr
)
57 ret
.type
= get_type(expr
);
59 ret
.type
= &int_ctype
;
60 ret
.value
= 123456789;
65 sval_t
sval_type_val(struct symbol
*type
, long long val
)
77 sval_t
sval_from_val(struct expression
*expr
, long long val
)
81 ret
= sval_blank(expr
);
83 ret
= sval_cast(get_type(expr
), ret
);
88 int sval_unsigned(sval_t sval
)
90 return type_unsigned(sval
.type
);
93 int sval_signed(sval_t sval
)
95 return !type_unsigned(sval
.type
);
98 int sval_bits(sval_t sval
)
100 return type_bits(sval
.type
);
103 int sval_bits_used(sval_t sval
)
107 for (i
= 64; i
>= 1; i
--) {
108 if (sval
.uvalue
& (1ULL << (i
- 1)))
114 int sval_is_negative(sval_t sval
)
116 if (type_unsigned(sval
.type
))
123 int sval_is_positive(sval_t sval
)
125 return !sval_is_negative(sval
);
128 int sval_is_min(sval_t sval
)
130 sval_t min
= sval_type_min(sval
.type
);
132 if (sval_unsigned(sval
)) {
133 if (sval
.uvalue
== 0)
137 /* return true for less than min as well */
138 return (sval
.value
<= min
.value
);
141 int sval_is_max(sval_t sval
)
143 sval_t max
= sval_type_max(sval
.type
);
145 if (sval_unsigned(sval
))
146 return (sval
.uvalue
>= max
.value
);
147 return (sval
.value
>= max
.value
);
150 int sval_is_a_min(sval_t sval
)
152 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
154 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
156 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
161 int sval_is_a_max(sval_t sval
)
163 if (sval
.uvalue
== SHRT_MAX
)
165 if (sval
.uvalue
== INT_MAX
)
167 if (sval
.uvalue
== LLONG_MAX
)
169 if (sval
.uvalue
== USHRT_MAX
)
171 if (sval
.uvalue
== UINT_MAX
)
173 if (sval_unsigned(sval
) && sval
.uvalue
== ULLONG_MAX
)
175 if (sval
.value
> valid_ptr_max
- 1000 &&
176 sval
.value
< valid_ptr_max
+ 1000)
181 int sval_is_negative_min(sval_t sval
)
183 if (!sval_is_negative(sval
))
185 return sval_is_min(sval
);
188 int sval_cmp_t(struct symbol
*type
, sval_t one
, sval_t two
)
190 sval_t one_cast
, two_cast
;
192 one_cast
= sval_cast(type
, one
);
193 two_cast
= sval_cast(type
, two
);
194 return sval_cmp(one_cast
, two_cast
);
197 int sval_cmp_val(sval_t one
, long long val
)
201 sval
= sval_type_val(&llong_ctype
, val
);
202 return sval_cmp(one
, sval
);
205 sval_t
sval_min(sval_t one
, sval_t two
)
207 if (sval_cmp(one
, two
) > 0)
212 sval_t
sval_max(sval_t one
, sval_t two
)
214 if (sval_cmp(one
, two
) < 0)
219 int sval_too_low(struct symbol
*type
, sval_t sval
)
221 if (sval_is_negative(sval
) && type_unsigned(type
))
223 if (type_signed(type
) && sval_unsigned(sval
))
225 if (type_signed(sval
.type
) &&
226 sval
.value
< sval_type_min(type
).value
)
228 if (sval_cmp(sval
, sval_type_min(type
)) < 0)
233 int sval_too_high(struct symbol
*type
, sval_t sval
)
235 if (sval_is_negative(sval
))
237 if (sval
.uvalue
> sval_type_max(type
).uvalue
)
242 int sval_fits(struct symbol
*type
, sval_t sval
)
244 if (sval_too_low(type
, sval
))
246 if (sval_too_high(type
, sval
))
251 sval_t
sval_cast(struct symbol
*type
, sval_t sval
)
259 switch (sval_bits(ret
)) {
261 if (sval_unsigned(ret
))
262 ret
.value
= (long long)(unsigned char)sval
.value
;
264 ret
.value
= (long long)(char)sval
.value
;
267 if (sval_unsigned(ret
))
268 ret
.value
= (long long)(unsigned short)sval
.value
;
270 ret
.value
= (long long)(short)sval
.value
;
273 if (sval_unsigned(ret
))
274 ret
.value
= (long long)(unsigned int)sval
.value
;
276 ret
.value
= (long long)(int)sval
.value
;
279 ret
.value
= sval
.value
;
285 sval_t
sval_preop(sval_t sval
, int op
)
289 sval
.value
= !sval
.value
;
292 sval
.value
= ~sval
.value
;
293 sval
= sval_cast(sval
.type
, sval
);
296 sval
.value
= -sval
.value
;
297 sval
= sval_cast(sval
.type
, sval
);
303 static sval_t
sval_binop_unsigned(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
310 ret
.uvalue
= left
.uvalue
* right
.uvalue
;
313 if (right
.uvalue
== 0) {
314 sm_msg("debug: %s: divide by zero", __func__
);
315 ret
.uvalue
= 123456789;
317 ret
.uvalue
= left
.uvalue
/ right
.uvalue
;
321 ret
.uvalue
= left
.uvalue
+ right
.uvalue
;
324 ret
.uvalue
= left
.uvalue
- right
.uvalue
;
327 if (right
.uvalue
== 0) {
328 sm_msg("internal error: %s: MOD by zero", __func__
);
329 ret
.uvalue
= 123456789;
331 ret
.uvalue
= left
.uvalue
% right
.uvalue
;
335 ret
.uvalue
= left
.uvalue
| right
.uvalue
;
338 ret
.uvalue
= left
.uvalue
& right
.uvalue
;
340 case SPECIAL_RIGHTSHIFT
:
341 ret
.uvalue
= left
.uvalue
>> right
.uvalue
;
343 case SPECIAL_LEFTSHIFT
:
344 ret
.uvalue
= left
.uvalue
<< right
.uvalue
;
347 ret
.uvalue
= left
.uvalue
^ right
.uvalue
;
350 sm_msg("internal error: %s: unhandled binop %s", __func__
,
352 ret
.uvalue
= 1234567;
358 static sval_t
sval_binop_signed(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
365 ret
.value
= left
.value
* right
.value
;
368 if (right
.value
== 0) {
369 sm_msg("debug: %s: divide by zero", __func__
);
370 ret
.value
= 123456789;
371 } else if (left
.value
== LLONG_MIN
&& right
.value
== -1) {
372 sm_msg("debug: %s: invalid divide LLONG_MIN/-1", __func__
);
373 ret
.value
= 12345678;
375 ret
.value
= left
.value
/ right
.value
;
379 ret
.value
= left
.value
+ right
.value
;
382 ret
.value
= left
.value
- right
.value
;
385 if (right
.value
== 0) {
386 sm_msg("internal error: %s: MOD by zero", __func__
);
387 ret
.value
= 123456789;
389 ret
.value
= left
.value
% right
.value
;
393 ret
.value
= left
.value
| right
.value
;
396 ret
.value
= left
.value
& right
.value
;
398 case SPECIAL_RIGHTSHIFT
:
399 ret
.value
= left
.value
>> right
.value
;
401 case SPECIAL_LEFTSHIFT
:
402 ret
.value
= left
.value
<< right
.value
;
405 ret
.value
= left
.value
^ right
.value
;
408 sm_msg("internal error: %s: unhandled binop %s", __func__
,
415 sval_t
sval_binop(sval_t left
, int op
, sval_t right
)
421 if (sval_positive_bits(right
) > sval_positive_bits(left
))
423 if (type_positive_bits(type
) < 31)
426 if (type_unsigned(type
))
427 ret
= sval_binop_unsigned(type
, left
, op
, right
);
429 ret
= sval_binop_signed(type
, left
, op
, right
);
430 return sval_cast(type
, ret
);
433 int sval_unop_overflows(sval_t sval
, int op
)
437 if (sval_positive_bits(sval
) == 32 && sval
.value
== INT_MIN
)
439 if (sval_positive_bits(sval
) == 64 && sval
.value
== LLONG_MIN
)
441 if (sval_is_negative(sval
))
443 if (sval_signed(sval
))
445 if (sval_bits(sval
) == 32 && sval
.uvalue
> INT_MAX
)
447 if (sval_bits(sval
) == 64 && sval
.uvalue
> LLONG_MAX
)
452 int sval_binop_overflows(sval_t left
, int op
, sval_t right
)
458 if (type_positive_bits(right
.type
) > type_positive_bits(left
.type
))
460 if (type_positive_bits(type
) < 31)
463 max
= sval_type_max(type
);
464 min
= sval_type_min(type
);
468 if (sval_is_negative(left
) && sval_is_negative(right
)) {
469 if (left
.value
< min
.value
+ right
.value
)
473 if (sval_is_negative(left
) || sval_is_negative(right
))
475 if (left
.uvalue
> max
.uvalue
- right
.uvalue
)
479 if (type_signed(type
)) {
480 if (left
.value
== 0 || right
.value
== 0)
482 if (left
.value
> max
.value
/ right
.value
)
484 if (left
.value
== -1 || right
.value
== -1)
486 return left
.value
!= left
.value
* right
.value
/ right
.value
;
489 return right
.uvalue
!= 0 && left
.uvalue
> max
.uvalue
/ right
.uvalue
;
491 if (type_unsigned(type
)) {
492 if (sval_cmp(left
, right
) < 0)
496 if (sval_is_negative(left
) && sval_is_negative(right
))
499 if (sval_is_negative(left
)) {
500 if (left
.value
< min
.value
+ right
.value
)
504 if (sval_is_negative(right
)) {
505 if (right
.value
== min
.value
)
507 right
= sval_preop(right
, '-');
508 if (sval_binop_overflows(left
, '+', right
))
513 case SPECIAL_LEFTSHIFT
:
514 if (sval_cmp(left
, sval_binop(max
, invert_op(op
), right
)) > 0)
521 unsigned long long fls_mask(unsigned long long uvalue
)
523 unsigned long long high_bit
= 0;
533 return ((unsigned long long)-1) >> (64 - high_bit
);
536 unsigned long long sval_fls_mask(sval_t sval
)
538 return fls_mask(sval
.uvalue
);
541 const char *sval_to_str(sval_t sval
)
545 if (sval_unsigned(sval
) && sval
.value
== ULLONG_MAX
)
547 if (sval_unsigned(sval
) && sval
.value
== UINT_MAX
)
549 if (sval
.value
== USHRT_MAX
)
552 if (sval_signed(sval
) && sval
.value
== LLONG_MAX
)
554 if (sval
.value
== INT_MAX
)
556 if (sval
.value
== SHRT_MAX
)
559 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
561 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
563 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
566 if (sval_unsigned(sval
))
567 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
568 else if (sval
.value
< 0)
569 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
571 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
573 return alloc_sname(buf
);
576 const char *sval_to_numstr(sval_t sval
)
580 if (sval_unsigned(sval
))
581 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
582 else if (sval
.value
< 0)
583 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
585 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
587 return alloc_sname(buf
);
590 sval_t
ll_to_sval(long long val
)
594 ret
.type
= &llong_ctype
;
599 static void free_svals(struct symbol
*sym
)
606 void register_sval(int my_id
)
608 add_hook(&free_svals
, AFTER_FUNC_HOOK
);