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 if (one
.value
== val
)
211 sval_t
sval_cast(struct symbol
*type
, sval_t sval
)
219 switch (sval_bits(ret
)) {
221 if (sval_unsigned(ret
))
222 ret
.value
= (long long)(unsigned char)sval
.value
;
224 ret
.value
= (long long)(char)sval
.value
;
227 if (sval_unsigned(ret
))
228 ret
.value
= (long long)(unsigned short)sval
.value
;
230 ret
.value
= (long long)(short)sval
.value
;
233 if (sval_unsigned(ret
))
234 ret
.value
= (long long)(unsigned int)sval
.value
;
236 ret
.value
= (long long)(int)sval
.value
;
239 ret
.value
= sval
.value
;
245 sval_t
sval_preop(sval_t sval
, int op
)
249 sval
.value
= !sval
.value
;
252 sval
.value
= ~sval
.value
;
253 /* fixme: should probably cast this here */
256 sval
.value
= -sval
.value
;
262 static sval_t
sval_binop_unsigned(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
269 ret
.uvalue
= left
.uvalue
* right
.uvalue
;
272 if (right
.uvalue
== 0) {
273 sm_msg("debug: %s: divide by zero", __func__
);
274 ret
.uvalue
= 123456789;
276 ret
.uvalue
= left
.uvalue
/ right
.uvalue
;
280 ret
.uvalue
= left
.uvalue
+ right
.uvalue
;
283 ret
.uvalue
= left
.uvalue
- right
.uvalue
;
286 if (right
.uvalue
== 0) {
287 sm_msg("internal error: %s: MOD by zero", __func__
);
288 ret
.uvalue
= 123456789;
290 ret
.uvalue
= left
.uvalue
% right
.uvalue
;
294 ret
.uvalue
= left
.uvalue
| right
.uvalue
;
297 ret
.uvalue
= left
.uvalue
& right
.uvalue
;
299 case SPECIAL_RIGHTSHIFT
:
300 ret
.uvalue
= left
.uvalue
>> right
.uvalue
;
302 case SPECIAL_LEFTSHIFT
:
303 ret
.uvalue
= left
.uvalue
<< right
.uvalue
;
306 ret
.uvalue
= left
.uvalue
^ right
.uvalue
;
309 sm_msg("internal error: %s: unhandled binop %s", __func__
,
311 ret
.uvalue
= 1234567;
317 static sval_t
sval_binop_signed(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
324 ret
.value
= left
.value
* right
.value
;
327 if (right
.value
== 0) {
328 sm_msg("debug: %s: divide by zero", __func__
);
329 ret
.value
= 123456789;
330 } else if (left
.value
== LLONG_MIN
&& right
.value
== -1) {
331 sm_msg("debug: %s: invalid divide LLONG_MIN/-1", __func__
);
332 ret
.value
= 12345678;
334 ret
.value
= left
.value
/ right
.value
;
338 ret
.value
= left
.value
+ right
.value
;
341 ret
.value
= left
.value
- right
.value
;
344 if (right
.value
== 0) {
345 sm_msg("internal error: %s: MOD by zero", __func__
);
346 ret
.value
= 123456789;
348 ret
.value
= left
.value
% right
.value
;
352 ret
.value
= left
.value
| right
.value
;
355 ret
.value
= left
.value
& right
.value
;
357 case SPECIAL_RIGHTSHIFT
:
358 ret
.value
= left
.value
>> right
.value
;
360 case SPECIAL_LEFTSHIFT
:
361 ret
.value
= left
.value
<< right
.value
;
364 ret
.value
= left
.value
^ right
.value
;
367 sm_msg("internal error: %s: unhandled binop %s", __func__
,
374 sval_t
sval_binop(sval_t left
, int op
, sval_t right
)
380 if (sval_positive_bits(right
) > sval_positive_bits(left
))
382 if (type_positive_bits(type
) < 31)
385 if (type_unsigned(type
))
386 ret
= sval_binop_unsigned(type
, left
, op
, right
);
388 ret
= sval_binop_signed(type
, left
, op
, right
);
392 const char *sval_to_str(sval_t sval
)
396 if (sval_unsigned(sval
) && sval
.value
== ULLONG_MAX
)
398 if (sval
.value
== LLONG_MAX
)
400 if (sval_unsigned(sval
) && sval
.value
== UINT_MAX
)
402 if (sval
.value
== INT_MAX
)
404 if (sval_unsigned(sval
) && sval
.value
== USHRT_MAX
)
407 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
409 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
411 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
414 if (sval_unsigned(sval
))
415 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
416 else if (sval
.value
< 0)
417 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
419 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
421 return alloc_sname(buf
);
424 const char *sval_to_numstr(sval_t sval
)
428 if (sval_unsigned(sval
))
429 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
430 else if (sval
.value
< 0)
431 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
433 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
435 return alloc_sname(buf
);
438 sval_t
ll_to_sval(long long val
)
442 ret
.type
= &llong_ctype
;
447 static void free_svals(struct symbol
*sym
)
452 void register_sval(int my_id
)
454 add_hook(&free_svals
, END_FUNC_HOOK
);