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(ret
, get_type(expr
));
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
);
124 * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
126 int sval_cmp(sval_t one
, sval_t two
)
131 if (sval_positive_bits(two
) > sval_positive_bits(one
))
133 if (sval_bits(tmp
) >= 32 && sval_unsigned(tmp
)) {
134 if (one
.uvalue
< two
.uvalue
)
136 if (one
.uvalue
== two
.uvalue
)
140 /* fix me handle type promotion and unsigned values */
141 if (one
.value
< two
.value
)
143 if (one
.value
== two
.value
)
148 int sval_cmp_t(struct symbol
*type
, sval_t one
, sval_t two
)
150 sval_t one_cast
, two_cast
;
152 one_cast
= sval_cast(one
, type
);
153 two_cast
= sval_cast(two
, type
);
154 return sval_cmp(one_cast
, two_cast
);
157 int sval_cmp_val(sval_t one
, long long val
)
161 if (one
.value
== val
)
166 sval_t
sval_cast(sval_t sval
, struct symbol
*type
)
174 switch (sval_bits(ret
)) {
176 if (sval_unsigned(ret
))
177 ret
.value
= (long long)(unsigned char)sval
.value
;
179 ret
.value
= (long long)(char)sval
.value
;
182 if (sval_unsigned(ret
))
183 ret
.value
= (long long)(unsigned short)sval
.value
;
185 ret
.value
= (long long)(short)sval
.value
;
188 if (sval_unsigned(ret
))
189 ret
.value
= (long long)(unsigned int)sval
.value
;
191 ret
.value
= (long long)(int)sval
.value
;
194 ret
.value
= sval
.value
;
200 sval_t
sval_preop(sval_t sval
, int op
)
204 sval
.value
= !sval
.value
;
207 sval
.value
= ~sval
.value
;
208 /* fixme: should probably cast this here */
211 sval
.value
= -sval
.value
;
217 static sval_t
sval_binop_unsigned(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
224 ret
.uvalue
= left
.uvalue
* right
.uvalue
;
227 if (right
.uvalue
== 0) {
228 sm_msg("debug: %s: divide by zero", __func__
);
229 ret
.uvalue
= 123456789;
231 ret
.uvalue
= left
.uvalue
/ right
.uvalue
;
235 ret
.uvalue
= left
.uvalue
+ right
.uvalue
;
238 ret
.uvalue
= left
.uvalue
- right
.uvalue
;
241 if (right
.uvalue
== 0) {
242 sm_msg("internal error: %s: MOD by zero", __func__
);
243 ret
.uvalue
= 123456789;
245 ret
.uvalue
= left
.uvalue
% right
.uvalue
;
249 ret
.uvalue
= left
.uvalue
| right
.uvalue
;
252 ret
.uvalue
= left
.uvalue
& right
.uvalue
;
254 case SPECIAL_RIGHTSHIFT
:
255 ret
.uvalue
= left
.uvalue
>> right
.uvalue
;
257 case SPECIAL_LEFTSHIFT
:
258 ret
.uvalue
= left
.uvalue
<< right
.uvalue
;
261 ret
.uvalue
= left
.uvalue
^ right
.uvalue
;
264 sm_msg("internal error: %s: unhandled binop %s", __func__
,
266 ret
.uvalue
= 1234567;
272 static sval_t
sval_binop_signed(struct symbol
*type
, sval_t left
, int op
, sval_t right
)
279 ret
.value
= left
.value
* right
.value
;
282 if (right
.value
== 0) {
283 sm_msg("debug: %s: divide by zero", __func__
);
284 ret
.value
= 123456789;
286 ret
.value
= left
.value
/ right
.value
;
290 ret
.value
= left
.value
+ right
.value
;
293 ret
.value
= left
.value
- right
.value
;
296 if (right
.value
== 0) {
297 sm_msg("internal error: %s: MOD by zero", __func__
);
298 ret
.value
= 123456789;
300 ret
.value
= left
.value
% right
.value
;
304 ret
.value
= left
.value
| right
.value
;
307 ret
.value
= left
.value
& right
.value
;
309 case SPECIAL_RIGHTSHIFT
:
310 ret
.value
= left
.value
>> right
.value
;
312 case SPECIAL_LEFTSHIFT
:
313 ret
.value
= left
.value
<< right
.value
;
316 ret
.value
= left
.value
^ right
.value
;
319 sm_msg("internal error: %s: unhandled binop %s", __func__
,
326 sval_t
sval_binop(sval_t left
, int op
, sval_t right
)
332 if (sval_positive_bits(right
) > sval_positive_bits(left
))
334 if (type_positive_bits(type
) < 31)
337 if (type_unsigned(type
))
338 ret
= sval_binop_unsigned(type
, left
, op
, right
);
340 ret
= sval_binop_signed(type
, left
, op
, right
);
344 const char *sval_to_str(sval_t sval
)
348 if (sval
.value
&& sval_bits(sval
) > 8 && sval_is_min(sval
))
350 if (sval_bits(sval
) > 8 && sval_is_max(sval
))
353 if (sval_unsigned(sval
) && sval
.value
== ULLONG_MAX
)
355 if (sval
.value
== LLONG_MAX
)
356 return "max"; // FIXME: should be s64max
357 if (sval_unsigned(sval
) && sval
.value
== UINT_MAX
)
359 if (sval
.value
== INT_MAX
)
361 if (sval_unsigned(sval
) && sval
.value
== USHRT_MAX
)
364 if ((sval
.type
== &sshort_ctype
|| sval
.type
== &short_ctype
) && sval
.value
== SHRT_MIN
)
366 if ((sval
.type
== &sint_ctype
|| sval
.type
== &int_ctype
) && sval
.value
== INT_MIN
)
368 if (sval_signed(sval
) && sval
.value
== LLONG_MIN
)
369 return "min"; // FIXME: should be s64min
371 if (sval_unsigned(sval
))
372 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
373 else if (sval
.value
< 0)
374 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
376 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
378 return alloc_sname(buf
);
381 const char *sval_to_numstr(sval_t sval
)
385 if (sval_unsigned(sval
))
386 snprintf(buf
, sizeof(buf
), "%llu", sval
.value
);
387 else if (sval
.value
< 0)
388 snprintf(buf
, sizeof(buf
), "(%lld)", sval
.value
);
390 snprintf(buf
, sizeof(buf
), "%lld", sval
.value
);
392 return alloc_sname(buf
);
395 sval_t
ll_to_sval(long long val
)
399 ret
.type
= &llong_ctype
;
404 static void free_svals(struct symbol
*sym
)
409 void register_sval(int my_id
)
411 add_hook(&free_svals
, END_FUNC_HOOK
);