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_is_min(sval_t sval
)
103 sval_t min
= sval_type_min(sval
.type
);
105 if (sval_unsigned(sval
)) {
106 if (sval
.uvalue
== 0)
110 /* return true for less than min as well */
111 return (sval
.value
<= min
.value
);
114 int sval_is_max(sval_t sval
)
116 sval_t max
= sval_type_max(sval
.type
);
118 if (sval_unsigned(sval
))
119 return (sval
.uvalue
>= max
.value
);
120 return (sval
.value
>= max
.value
);
123 int sval_is_a_min(sval_t sval
)
125 if (sval_signed(sval
) && sval
.value
== SHRT_MIN
)
127 if (sval_signed(sval
) && sval
.value
== INT_MIN
)
129 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
134 int sval_is_a_max(sval_t sval
)
136 if (sval
.uvalue
== SHRT_MAX
)
138 if (sval
.uvalue
== INT_MAX
)
140 if (sval
.uvalue
== LLONG_MAX
)
142 if (sval
.uvalue
== USHRT_MAX
)
144 if (sval
.uvalue
== UINT_MAX
)
146 if (sval_unsigned(sval
) && sval
.uvalue
== ULLONG_MAX
)
152 * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
154 int sval_cmp(sval_t one
, sval_t two
)
159 if (sval_positive_bits(two
) > sval_positive_bits(one
))
161 if (sval_bits(tmp
) >= 32 && sval_unsigned(tmp
)) {
162 if (one
.uvalue
< two
.uvalue
)
164 if (one
.uvalue
== two
.uvalue
)
168 /* fix me handle type promotion and unsigned values */
169 if (one
.value
< two
.value
)
171 if (one
.value
== two
.value
)
176 int sval_cmp_t(struct symbol
*type
, sval_t one
, sval_t two
)
178 sval_t one_cast
, two_cast
;
180 one_cast
= sval_cast(type
, one
);
181 two_cast
= sval_cast(type
, two
);
182 return sval_cmp(one_cast
, two_cast
);
185 int sval_cmp_val(sval_t one
, long long val
)
189 if (one
.value
== val
)
194 sval_t
sval_cast(struct symbol
*type
, sval_t sval
)
202 switch (sval_bits(ret
)) {
204 if (sval_unsigned(ret
))
205 ret
.value
= (long long)(unsigned char)sval
.value
;
207 ret
.value
= (long long)(char)sval
.value
;
210 if (sval_unsigned(ret
))
211 ret
.value
= (long long)(unsigned short)sval
.value
;
213 ret
.value
= (long long)(short)sval
.value
;
216 if (sval_unsigned(ret
))
217 ret
.value
= (long long)(unsigned int)sval
.value
;
219 ret
.value
= (long long)(int)sval
.value
;
222 ret
.value
= sval
.value
;
228 sval_t
sval_preop(sval_t sval
, int op
)
232 sval
.value
= !sval
.value
;
235 sval
.value
= ~sval
.value
;
236 /* fixme: should probably cast this here */
239 sval
.value
= -sval
.value
;
245 static sval_t
sval_binop_unsigned(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
252 ret
.uvalue
= left
.uvalue
* right
.uvalue
;
255 if (right
.uvalue
== 0) {
256 sm_msg("debug: %s: divide by zero", __func__
);
257 ret
.uvalue
= 123456789;
259 ret
.uvalue
= left
.uvalue
/ right
.uvalue
;
263 ret
.uvalue
= left
.uvalue
+ right
.uvalue
;
266 ret
.uvalue
= left
.uvalue
- right
.uvalue
;
269 if (right
.uvalue
== 0) {
270 sm_msg("internal error: %s: MOD by zero", __func__
);
271 ret
.uvalue
= 123456789;
273 ret
.uvalue
= left
.uvalue
% right
.uvalue
;
277 ret
.uvalue
= left
.uvalue
| right
.uvalue
;
280 ret
.uvalue
= left
.uvalue
& right
.uvalue
;
282 case SPECIAL_RIGHTSHIFT
:
283 ret
.uvalue
= left
.uvalue
>> right
.uvalue
;
285 case SPECIAL_LEFTSHIFT
:
286 ret
.uvalue
= left
.uvalue
<< right
.uvalue
;
289 ret
.uvalue
= left
.uvalue
^ right
.uvalue
;
292 sm_msg("internal error: %s: unhandled binop %s", __func__
,
294 ret
.uvalue
= 1234567;
300 static sval_t
sval_binop_signed(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
307 ret
.value
= left
.value
* right
.value
;
310 if (right
.value
== 0) {
311 sm_msg("debug: %s: divide by zero", __func__
);
312 ret
.value
= 123456789;
313 } else if (left
.value
== LLONG_MIN
&& right
.value
== -1) {
314 sm_msg("debug: %s: invalid divide LLONG_MIN/-1", __func__
);
315 ret
.value
= 12345678;
317 ret
.value
= left
.value
/ right
.value
;
321 ret
.value
= left
.value
+ right
.value
;
324 ret
.value
= left
.value
- right
.value
;
327 if (right
.value
== 0) {
328 sm_msg("internal error: %s: MOD by zero", __func__
);
329 ret
.value
= 123456789;
331 ret
.value
= left
.value
% right
.value
;
335 ret
.value
= left
.value
| right
.value
;
338 ret
.value
= left
.value
& right
.value
;
340 case SPECIAL_RIGHTSHIFT
:
341 ret
.value
= left
.value
>> right
.value
;
343 case SPECIAL_LEFTSHIFT
:
344 ret
.value
= left
.value
<< right
.value
;
347 ret
.value
= left
.value
^ right
.value
;
350 sm_msg("internal error: %s: unhandled binop %s", __func__
,
357 sval_t
sval_binop(sval_t left
, int op
, sval_t right
)
363 if (sval_positive_bits(right
) > sval_positive_bits(left
))
365 if (type_positive_bits(type
) < 31)
368 if (type_unsigned(type
))
369 ret
= sval_binop_unsigned(type
, left
, op
, right
);
371 ret
= sval_binop_signed(type
, left
, op
, right
);
375 const char *sval_to_str(sval_t sval
)
379 if (sval
.value
&& sval_bits(sval
) > 8 && sval_is_min(sval
))
381 if (sval_bits(sval
) > 8 && sval_is_max(sval
))
384 if (sval_unsigned(sval
) && sval
.value
== ULLONG_MAX
)
386 if (sval
.value
== LLONG_MAX
)
387 return "max"; // FIXME: should be s64max
388 if (sval_unsigned(sval
) && sval
.value
== UINT_MAX
)
390 if (sval
.value
== INT_MAX
)
392 if (sval_unsigned(sval
) && sval
.value
== USHRT_MAX
)
395 if ((sval
.type
== &sshort_ctype
|| sval
.type
== &short_ctype
) && sval
.value
== SHRT_MIN
)
397 if ((sval
.type
== &sint_ctype
|| sval
.type
== &int_ctype
) && sval
.value
== INT_MIN
)
399 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
400 return "min"; // FIXME: should be s64min
402 if (sval_unsigned(sval
))
403 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
404 else if (sval
.value
< 0)
405 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
407 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
409 return alloc_sname(buf
);
412 const char *sval_to_numstr(sval_t sval
)
416 if (sval_unsigned(sval
))
417 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
418 else if (sval
.value
< 0)
419 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
421 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
423 return alloc_sname(buf
);
426 sval_t
ll_to_sval(long long val
)
430 ret
.type
= &llong_ctype
;
435 static void free_svals(struct symbol
*sym
)
440 void register_sval(int my_id
)
442 add_hook(&free_svals
, END_FUNC_HOOK
);