blob: 8ebb264857afe81dae4174a86f0659ab4fc870bb (
plain)
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
|
/* Problem with inverting constants
*/
#include <testfwk.h>
enum
{
USEDFLAG = 1
};
typedef struct _HeapEntry HeapEntry;
typedef unsigned int UINT;
struct _HeapEntry
{
HeapEntry *pPrev;
HeapEntry *pNext;
UINT uSize;
};
static UINT _getSize1(HeapEntry *pEnt)
{
return pEnt->uSize & ~USEDFLAG;
}
static UINT _getSize2(HeapEntry *pEnt)
{
return pEnt->uSize & ~1;
}
static UINT _getSize3(HeapEntry *pEnt)
{
return pEnt->uSize & 0xFFFE;
}
static void
testMask(void)
{
HeapEntry ent;
ent.uSize = 123;
ASSERT(_getSize1(&ent) == 122);
ASSERT(_getSize2(&ent) == 122);
ASSERT(_getSize3(&ent) == 122);
ent.uSize = 0x1234;
ASSERT(_getSize1(&ent) == 0x1234);
ASSERT(_getSize2(&ent) == 0x1234);
ASSERT(_getSize3(&ent) == 0x1234);
}
|
