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[176] | 1 | // -*- C++ -*- |
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| 2 | |
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| 3 | #ifndef _IGNOREINVALIDFREE_H_ |
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| 4 | #define _IGNOREINVALIDFREE_H_ |
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| 5 | |
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| 6 | #include "hldefines.h" |
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| 7 | |
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| 8 | namespace Hoard { |
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| 9 | |
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| 10 | // A class that checks to see if the object to be freed is inside a |
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| 11 | // valid superblock. If not, it drops the object on the floor. We do |
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| 12 | // this in the name of robustness (turning a segfault or data |
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| 13 | // corruption into a potential memory leak) and because on some |
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| 14 | // systems, it's impossible to catch the first few allocated objects. |
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| 15 | |
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| 16 | template <class S> |
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| 17 | class IgnoreInvalidFree : public S { |
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| 18 | public: |
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| 19 | INLINE void free (void * ptr) { |
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| 20 | typename S::SuperblockType * s = S::getSuperblock (ptr); |
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| 21 | if (!s || (!s->isValidSuperblock())) { |
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| 22 | // We encountered an invalid free, so we drop it. |
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| 23 | return; |
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| 24 | } |
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| 25 | S::free (ptr); |
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| 26 | } |
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| 27 | |
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| 28 | INLINE size_t getSize (void * ptr) { |
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| 29 | typename S::SuperblockType * s = S::getSuperblock (ptr); |
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| 30 | if (!s || (!s->isValidSuperblock())) { |
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| 31 | return 0; |
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| 32 | } |
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| 33 | return S::getSize (ptr); |
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| 34 | } |
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| 35 | |
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| 36 | private: |
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| 37 | |
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| 38 | // A special value that is placed into deallocated objects. |
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| 39 | enum { ALREADY_FREED_VALUE = 0xDeadBeef }; |
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| 40 | |
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| 41 | }; |
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| 42 | |
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| 43 | }; |
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| 44 | |
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| 45 | #endif |
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