4 * Copyright (C) 2012 Oracle.
6 * Licensed under the Open Software License version 1.1
9 * Basically the point of sval is that it can hold both ULLONG_MAX and
10 * LLONG_MIN. If it is an unsigned type then we use sval.uvalue or if it is
11 * signed we use sval.value.
13 * I considered just using one bit to store whether the value was signed vs
14 * unsigned but I think it might help to have the type information so we know
15 * how to do type promotion.
20 #include "smatch_slist.h"
21 #include "smatch_extra.h"
23 __ALLOCATOR(sval_t
, "svals", sval
);
25 sval_t
*sval_alloc(sval_t sval
)
29 ret
= __alloc_sval(0);
34 sval_t
*sval_alloc_permanent(sval_t sval
)
38 ret
= malloc(sizeof(*ret
));
43 sval_t
sval_blank(struct expression
*expr
)
47 ret
.type
= get_type(expr
);
49 ret
.type
= &llong_ctype
;
50 ret
.value
= 123456789;
55 sval_t
sval_type_val(struct symbol
*type
, long long val
)
64 sval_t
sval_from_val(struct expression
*expr
, long long val
)
68 ret
= sval_blank(expr
);
70 ret
= sval_cast(get_type(expr
), ret
);
75 int sval_unsigned(sval_t sval
)
77 return type_unsigned(sval
.type
);
80 int sval_signed(sval_t sval
)
82 return !type_unsigned(sval
.type
);
85 int sval_bits(sval_t sval
)
87 return type_bits(sval
.type
);
90 int sval_positive_bits(sval_t sval
)
92 return type_positive_bits(sval
.type
);
95 int sval_bits_used(sval_t sval
)
99 for (i
= 64; i
>= 1; i
--) {
100 if (sval
.uvalue
& (1ULL << (i
- 1)))
106 int sval_is_negative(sval_t sval
)
108 if (sval_cmp_val(sval
, 0) < 0)
113 int sval_is_positive(sval_t sval
)
115 return !sval_is_negative(sval
);
118 int sval_is_min(sval_t sval
)
120 sval_t min
= sval_type_min(sval
.type
);
122 if (sval_unsigned(sval
)) {
123 if (sval
.uvalue
== 0)
127 /* return true for less than min as well */
128 return (sval
.value
<= min
.value
);
131 int sval_is_max(sval_t sval
)
133 sval_t max
= sval_type_max(sval
.type
);
135 if (sval_unsigned(sval
))
136 return (sval
.uvalue
>= max
.value
);
137 return (sval
.value
>= max
.value
);
140 int sval_is_a_min(sval_t sval
)
142 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
144 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
146 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
151 int sval_is_a_max(sval_t sval
)
153 if (sval
.uvalue
== SHRT_MAX
)
155 if (sval
.uvalue
== INT_MAX
)
157 if (sval
.uvalue
== LLONG_MAX
)
159 if (sval
.uvalue
== USHRT_MAX
)
161 if (sval
.uvalue
== UINT_MAX
)
163 if (sval_unsigned(sval
) && sval
.uvalue
== ULLONG_MAX
)
169 * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
171 int sval_cmp(sval_t one
, sval_t two
)
176 if (sval_positive_bits(two
) > sval_positive_bits(one
))
178 if (type_bits(type
) < 31)
181 one
= sval_cast(type
, one
);
182 two
= sval_cast(type
, two
);
184 if (type_unsigned(type
)) {
185 if (one
.uvalue
< two
.uvalue
)
187 if (one
.uvalue
== two
.uvalue
)
191 /* fix me handle type promotion and unsigned values */
192 if (one
.value
< two
.value
)
194 if (one
.value
== two
.value
)
199 int sval_cmp_t(struct symbol
*type
, sval_t one
, sval_t two
)
201 sval_t one_cast
, two_cast
;
203 one_cast
= sval_cast(type
, one
);
204 two_cast
= sval_cast(type
, two
);
205 return sval_cmp(one_cast
, two_cast
);
208 int sval_cmp_val(sval_t one
, long long val
)
212 sval
= sval_type_val(&llong_ctype
, val
);
213 return sval_cmp(one
, sval
);
216 sval_t
sval_min(sval_t one
, sval_t two
)
218 if (sval_cmp(one
, two
) > 0)
223 sval_t
sval_max(sval_t one
, sval_t two
)
225 if (sval_cmp(one
, two
) < 0)
230 int sval_too_low(struct symbol
*type
, sval_t sval
)
232 if (sval_is_negative(sval
) && type_unsigned(type
))
234 if (type_signed(type
) && sval_unsigned(sval
))
236 if (sval_cmp(sval
, sval_type_min(type
)) < 0)
241 int sval_too_high(struct symbol
*type
, sval_t sval
)
243 if (sval_is_negative(sval
))
245 if (sval_cmp(sval
, sval_type_max(type
)) > 0)
250 int sval_fits(struct symbol
*type
, sval_t sval
)
252 if (sval_too_low(type
, sval
))
254 if (sval_too_high(type
, sval
))
259 sval_t
sval_cast(struct symbol
*type
, sval_t sval
)
267 switch (sval_bits(ret
)) {
269 if (sval_unsigned(ret
))
270 ret
.value
= (long long)(unsigned char)sval
.value
;
272 ret
.value
= (long long)(char)sval
.value
;
275 if (sval_unsigned(ret
))
276 ret
.value
= (long long)(unsigned short)sval
.value
;
278 ret
.value
= (long long)(short)sval
.value
;
281 if (sval_unsigned(ret
))
282 ret
.value
= (long long)(unsigned int)sval
.value
;
284 ret
.value
= (long long)(int)sval
.value
;
287 ret
.value
= sval
.value
;
293 sval_t
sval_preop(sval_t sval
, int op
)
297 sval
.value
= !sval
.value
;
300 sval
.value
= ~sval
.value
;
301 /* fixme: should probably cast this here */
304 sval
.value
= -sval
.value
;
310 static sval_t
sval_binop_unsigned(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
317 ret
.uvalue
= left
.uvalue
* right
.uvalue
;
320 if (right
.uvalue
== 0) {
321 sm_msg("debug: %s: divide by zero", __func__
);
322 ret
.uvalue
= 123456789;
324 ret
.uvalue
= left
.uvalue
/ right
.uvalue
;
328 ret
.uvalue
= left
.uvalue
+ right
.uvalue
;
331 ret
.uvalue
= left
.uvalue
- right
.uvalue
;
334 if (right
.uvalue
== 0) {
335 sm_msg("internal error: %s: MOD by zero", __func__
);
336 ret
.uvalue
= 123456789;
338 ret
.uvalue
= left
.uvalue
% right
.uvalue
;
342 ret
.uvalue
= left
.uvalue
| right
.uvalue
;
345 ret
.uvalue
= left
.uvalue
& right
.uvalue
;
347 case SPECIAL_RIGHTSHIFT
:
348 ret
.uvalue
= left
.uvalue
>> right
.uvalue
;
350 case SPECIAL_LEFTSHIFT
:
351 ret
.uvalue
= left
.uvalue
<< right
.uvalue
;
354 ret
.uvalue
= left
.uvalue
^ right
.uvalue
;
357 sm_msg("internal error: %s: unhandled binop %s", __func__
,
359 ret
.uvalue
= 1234567;
365 static sval_t
sval_binop_signed(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
372 ret
.value
= left
.value
* right
.value
;
375 if (right
.value
== 0) {
376 sm_msg("debug: %s: divide by zero", __func__
);
377 ret
.value
= 123456789;
378 } else if (left
.value
== LLONG_MIN
&& right
.value
== -1) {
379 sm_msg("debug: %s: invalid divide LLONG_MIN/-1", __func__
);
380 ret
.value
= 12345678;
382 ret
.value
= left
.value
/ right
.value
;
386 ret
.value
= left
.value
+ right
.value
;
389 ret
.value
= left
.value
- right
.value
;
392 if (right
.value
== 0) {
393 sm_msg("internal error: %s: MOD by zero", __func__
);
394 ret
.value
= 123456789;
396 ret
.value
= left
.value
% right
.value
;
400 ret
.value
= left
.value
| right
.value
;
403 ret
.value
= left
.value
& right
.value
;
405 case SPECIAL_RIGHTSHIFT
:
406 ret
.value
= left
.value
>> right
.value
;
408 case SPECIAL_LEFTSHIFT
:
409 ret
.value
= left
.value
<< right
.value
;
412 ret
.value
= left
.value
^ right
.value
;
415 sm_msg("internal error: %s: unhandled binop %s", __func__
,
422 sval_t
sval_binop(sval_t left
, int op
, sval_t right
)
428 if (sval_positive_bits(right
) > sval_positive_bits(left
))
430 if (type_positive_bits(type
) < 31)
433 if (type_unsigned(type
))
434 ret
= sval_binop_unsigned(type
, left
, op
, right
);
436 ret
= sval_binop_signed(type
, left
, op
, right
);
440 int sval_binop_overflows(sval_t left
, int op
, sval_t right
)
442 sval_t max
= sval_type_max(left
.type
);
446 if (sval_cmp(left
, sval_binop(max
, '-', right
)) > 0)
450 if (sval_cmp(left
, sval_binop(max
, '/', right
)) > 0)
457 const char *sval_to_str(sval_t sval
)
461 if (sval_unsigned(sval
) && sval
.value
== ULLONG_MAX
)
463 if (sval
.value
== LLONG_MAX
)
465 if (sval_unsigned(sval
) && sval
.value
== UINT_MAX
)
467 if (sval
.value
== INT_MAX
)
469 if (sval_unsigned(sval
) && sval
.value
== USHRT_MAX
)
471 if (sval
.value
== SHRT_MAX
)
474 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
476 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
478 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
481 if (sval_unsigned(sval
))
482 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
483 else if (sval
.value
< 0)
484 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
486 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
488 return alloc_sname(buf
);
491 const char *sval_to_numstr(sval_t sval
)
495 if (sval_unsigned(sval
))
496 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
497 else if (sval
.value
< 0)
498 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
500 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
502 return alloc_sname(buf
);
505 sval_t
ll_to_sval(long long val
)
509 ret
.type
= &llong_ctype
;
514 static void free_svals(struct symbol
*sym
)
519 void register_sval(int my_id
)
521 add_hook(&free_svals
, END_FUNC_HOOK
);