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1 | /* -*- C++ -*- */ |
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2 | |
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3 | |
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4 | #ifndef _DEBUGHEAP_H_ |
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5 | #define _DEBUGHEAP_H_ |
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6 | |
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7 | #include <assert.h> |
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8 | |
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9 | /** |
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10 | * |
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11 | * |
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12 | */ |
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13 | |
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14 | namespace HL { |
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15 | |
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16 | template <class Super, |
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17 | char freeChar = 'F'> |
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18 | class DebugHeap : public Super { |
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19 | private: |
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20 | |
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21 | enum { CANARY = 0xdeadbeef }; |
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22 | |
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23 | public: |
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24 | |
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25 | // Fill with A's. |
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26 | inline void * malloc (size_t sz) { |
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27 | // Add a guard area at the end. |
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28 | void * ptr; |
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29 | ptr = Super::malloc (sz + sizeof(unsigned long)); |
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30 | memset (ptr, 'A', sz); |
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31 | *((unsigned long *) ((char *) ptr + sz)) = (unsigned long) CANARY; |
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32 | assert (Super::getSize(ptr) >= sz); |
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33 | return ptr; |
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34 | } |
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35 | |
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36 | // Fill with F's. |
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37 | inline void free (void * ptr) { |
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38 | char * b = (char *) ptr; |
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39 | size_t sz = Super::getSize(ptr); |
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40 | // Check for the canary. |
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41 | unsigned long storedCanary = *((unsigned long *) b + sz - sizeof(unsigned long)); |
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42 | if (storedCanary != CANARY) { |
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43 | abort(); |
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44 | } |
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45 | memset (ptr, freeChar, sz); |
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46 | Super::free (ptr); |
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47 | } |
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48 | }; |
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49 | |
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50 | } |
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51 | |
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52 | #endif |
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