Line | |
---|
1 | // -*- C++ -*- |
---|
2 | |
---|
3 | #ifndef _IGNOREINVALIDFREE_H_ |
---|
4 | #define _IGNOREINVALIDFREE_H_ |
---|
5 | |
---|
6 | #include "hldefines.h" |
---|
7 | |
---|
8 | namespace Hoard { |
---|
9 | |
---|
10 | // A class that checks to see if the object to be freed is inside a |
---|
11 | // valid superblock. If not, it drops the object on the floor. We do |
---|
12 | // this in the name of robustness (turning a segfault or data |
---|
13 | // corruption into a potential memory leak) and because on some |
---|
14 | // systems, it's impossible to catch the first few allocated objects. |
---|
15 | |
---|
16 | template <class S> |
---|
17 | class IgnoreInvalidFree : public S { |
---|
18 | public: |
---|
19 | INLINE void free (void * ptr) { |
---|
20 | typename S::SuperblockType * s = S::getSuperblock (ptr); |
---|
21 | if (!s || (!s->isValidSuperblock())) { |
---|
22 | // We encountered an invalid free, so we drop it. |
---|
23 | return; |
---|
24 | } |
---|
25 | S::free (ptr); |
---|
26 | } |
---|
27 | |
---|
28 | INLINE size_t getSize (void * ptr) { |
---|
29 | typename S::SuperblockType * s = S::getSuperblock (ptr); |
---|
30 | if (!s || (!s->isValidSuperblock())) { |
---|
31 | return 0; |
---|
32 | } |
---|
33 | return S::getSize (ptr); |
---|
34 | } |
---|
35 | |
---|
36 | private: |
---|
37 | |
---|
38 | // A special value that is placed into deallocated objects. |
---|
39 | enum { ALREADY_FREED_VALUE = 0xDeadBeef }; |
---|
40 | |
---|
41 | }; |
---|
42 | |
---|
43 | }; |
---|
44 | |
---|
45 | #endif |
---|
Note: See
TracBrowser
for help on using the repository browser.