1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
#include <stdlib.h>
#include "../../gcc.dg/analyzer/analyzer-decls.h"
struct iter
{
int start;
int end;
int step;
int val;
};
struct iter * __attribute__((noinline))
iter_new (int start, int end, int step)
{
struct iter *it = (struct iter *)malloc (sizeof (struct iter));
if (!it)
abort ();
it->start = start;
it->end = end;
it->step = step;
it->val = start;
return it;
}
int __attribute__((noinline))
iter_done_p (struct iter *it)
{
return it->val >= it->end;
}
void __attribute__((noinline))
iter_next (struct iter *it)
{
it->val += it->step;
}
/* Example of an iterator object, to see how well we cope with a well-disguised
iteration from 0 to n with a step of 1. */
void test(int n)
{
__analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
struct iter *it = iter_new (0, n, 1);
while (!iter_done_p (it))
{
__analyzer_eval (it->val < n); /* { dg-warning "TRUE" "true" } */
/* { dg-bogus "UNKNOWN" "unknown" { xfail *-*-* } .-1 } */
/* TODO(xfail^^^): ideally we ought to figure out i > 0 after 1st iteration. */
__analyzer_eval (it->val == 0); /* { dg-warning "TRUE" "true on 1st iter" } */
/* { dg-warning "UNKNOWN" "unknown" { target *-*-* } .-1 } */
/* TODO: should we ought to figure out i > 0 after 1st iteration? */
__analyzer_eval (it->val >= 0); /* { dg-warning "TRUE" } */
__analyzer_dump_exploded_nodes (0); /* { dg-warning "2 processed enodes" } */
iter_next (it);
}
__analyzer_eval (it->val >= n); /* { dg-warning "TRUE" "true" { xfail *-*-* } } */
/* { dg-bogus "UNKNOWN" "unknown" { xfail *-*-* } .-1 } */
__analyzer_eval (it->val == n); /* { dg-warning "TRUE" "desired" { xfail *-*-* } } */
/* { dg-warning "UNKNOWN" "status quo" { target *-*-* } .-1 } */
/* TODO(xfail^^^): it only figures out i >= 256, rather than i == 256. */
free (it);
__analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
}
|
