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
)
89 return sval
.type
->bit_size
;
92 int sval_positive_bits(sval_t sval
)
96 if (sval_signed(sval
))
97 return sval
.type
->bit_size
- 1;
98 return sval
.type
->bit_size
;
101 int sval_bits_used(sval_t sval
)
105 for (i
= 64; i
>= 1; i
--) {
106 if (sval
.uvalue
& (1ULL << (i
- 1)))
112 int sval_is_min(sval_t sval
)
114 sval_t min
= sval_type_min(sval
.type
);
116 if (sval_unsigned(sval
)) {
117 if (sval
.uvalue
== 0)
121 /* return true for less than min as well */
122 return (sval
.value
<= min
.value
);
125 int sval_is_max(sval_t sval
)
127 sval_t max
= sval_type_max(sval
.type
);
129 if (sval_unsigned(sval
))
130 return (sval
.uvalue
>= max
.value
);
131 return (sval
.value
>= max
.value
);
134 int sval_is_a_min(sval_t sval
)
136 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
138 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
140 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
145 int sval_is_a_max(sval_t sval
)
147 if (sval
.uvalue
== SHRT_MAX
)
149 if (sval
.uvalue
== INT_MAX
)
151 if (sval
.uvalue
== LLONG_MAX
)
153 if (sval
.uvalue
== USHRT_MAX
)
155 if (sval
.uvalue
== UINT_MAX
)
157 if (sval_unsigned(sval
) && sval
.uvalue
== ULLONG_MAX
)
163 * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
165 int sval_cmp(sval_t one
, sval_t two
)
170 if (sval_positive_bits(two
) > sval_positive_bits(one
))
172 if (type_bits(type
) < 31)
175 one
= sval_cast(type
, one
);
176 two
= sval_cast(type
, two
);
178 if (type_unsigned(type
)) {
179 if (one
.uvalue
< two
.uvalue
)
181 if (one
.uvalue
== two
.uvalue
)
185 /* fix me handle type promotion and unsigned values */
186 if (one
.value
< two
.value
)
188 if (one
.value
== two
.value
)
193 int sval_cmp_t(struct symbol
*type
, sval_t one
, sval_t two
)
195 sval_t one_cast
, two_cast
;
197 one_cast
= sval_cast(type
, one
);
198 two_cast
= sval_cast(type
, two
);
199 return sval_cmp(one_cast
, two_cast
);
202 int sval_cmp_val(sval_t one
, long long val
)
206 sval
= sval_type_val(&llong_ctype
, val
);
207 return sval_cmp(one
, sval
);
210 sval_t
sval_cast(struct symbol
*type
, sval_t sval
)
218 switch (sval_bits(ret
)) {
220 if (sval_unsigned(ret
))
221 ret
.value
= (long long)(unsigned char)sval
.value
;
223 ret
.value
= (long long)(char)sval
.value
;
226 if (sval_unsigned(ret
))
227 ret
.value
= (long long)(unsigned short)sval
.value
;
229 ret
.value
= (long long)(short)sval
.value
;
232 if (sval_unsigned(ret
))
233 ret
.value
= (long long)(unsigned int)sval
.value
;
235 ret
.value
= (long long)(int)sval
.value
;
238 ret
.value
= sval
.value
;
244 sval_t
sval_preop(sval_t sval
, int op
)
248 sval
.value
= !sval
.value
;
251 sval
.value
= ~sval
.value
;
252 /* fixme: should probably cast this here */
255 sval
.value
= -sval
.value
;
261 static sval_t
sval_binop_unsigned(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
268 ret
.uvalue
= left
.uvalue
* right
.uvalue
;
271 if (right
.uvalue
== 0) {
272 sm_msg("debug: %s: divide by zero", __func__
);
273 ret
.uvalue
= 123456789;
275 ret
.uvalue
= left
.uvalue
/ right
.uvalue
;
279 ret
.uvalue
= left
.uvalue
+ right
.uvalue
;
282 ret
.uvalue
= left
.uvalue
- right
.uvalue
;
285 if (right
.uvalue
== 0) {
286 sm_msg("internal error: %s: MOD by zero", __func__
);
287 ret
.uvalue
= 123456789;
289 ret
.uvalue
= left
.uvalue
% right
.uvalue
;
293 ret
.uvalue
= left
.uvalue
| right
.uvalue
;
296 ret
.uvalue
= left
.uvalue
& right
.uvalue
;
298 case SPECIAL_RIGHTSHIFT
:
299 ret
.uvalue
= left
.uvalue
>> right
.uvalue
;
301 case SPECIAL_LEFTSHIFT
:
302 ret
.uvalue
= left
.uvalue
<< right
.uvalue
;
305 ret
.uvalue
= left
.uvalue
^ right
.uvalue
;
308 sm_msg("internal error: %s: unhandled binop %s", __func__
,
310 ret
.uvalue
= 1234567;
316 static sval_t
sval_binop_signed(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
323 ret
.value
= left
.value
* right
.value
;
326 if (right
.value
== 0) {
327 sm_msg("debug: %s: divide by zero", __func__
);
328 ret
.value
= 123456789;
329 } else if (left
.value
== LLONG_MIN
&& right
.value
== -1) {
330 sm_msg("debug: %s: invalid divide LLONG_MIN/-1", __func__
);
331 ret
.value
= 12345678;
333 ret
.value
= left
.value
/ right
.value
;
337 ret
.value
= left
.value
+ right
.value
;
340 ret
.value
= left
.value
- right
.value
;
343 if (right
.value
== 0) {
344 sm_msg("internal error: %s: MOD by zero", __func__
);
345 ret
.value
= 123456789;
347 ret
.value
= left
.value
% right
.value
;
351 ret
.value
= left
.value
| right
.value
;
354 ret
.value
= left
.value
& right
.value
;
356 case SPECIAL_RIGHTSHIFT
:
357 ret
.value
= left
.value
>> right
.value
;
359 case SPECIAL_LEFTSHIFT
:
360 ret
.value
= left
.value
<< right
.value
;
363 ret
.value
= left
.value
^ right
.value
;
366 sm_msg("internal error: %s: unhandled binop %s", __func__
,
373 sval_t
sval_binop(sval_t left
, int op
, sval_t right
)
379 if (sval_positive_bits(right
) > sval_positive_bits(left
))
381 if (type_positive_bits(type
) < 31)
384 if (type_unsigned(type
))
385 ret
= sval_binop_unsigned(type
, left
, op
, right
);
387 ret
= sval_binop_signed(type
, left
, op
, right
);
391 const char *sval_to_str(sval_t sval
)
395 if (sval_unsigned(sval
) && sval
.value
== ULLONG_MAX
)
397 if (sval
.value
== LLONG_MAX
)
399 if (sval_unsigned(sval
) && sval
.value
== UINT_MAX
)
401 if (sval
.value
== INT_MAX
)
403 if (sval_unsigned(sval
) && sval
.value
== USHRT_MAX
)
406 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
408 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
410 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
413 if (sval_unsigned(sval
))
414 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
415 else if (sval
.value
< 0)
416 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
418 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
420 return alloc_sname(buf
);
423 const char *sval_to_numstr(sval_t sval
)
427 if (sval_unsigned(sval
))
428 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
429 else if (sval
.value
< 0)
430 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
432 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
434 return alloc_sname(buf
);
437 sval_t
ll_to_sval(long long val
)
441 ret
.type
= &llong_ctype
;
446 static void free_svals(struct symbol
*sym
)
451 void register_sval(int my_id
)
453 add_hook(&free_svals
, END_FUNC_HOOK
);