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bpo-36389: Change PyMem_SetupDebugHooks() constants (GH-12782)

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Modify CLEANBYTE, DEADDYTE and FORBIDDENBYTE constants: use 0xCD,
0xDD and 0xFD, rather than 0xCB, 0xBB and 0xFB, to use the same byte
patterns than Windows CRT debug malloc() and free().
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Victor Stinner 2019-04-11 13:01:15 +02:00 • committed by GitHub
parent 536a35b3f1
commit 4c409beb4c
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6 changed files with 37 additions and 24 deletions
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Objects/obmalloc.c
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@ -1915,13 +1915,16 @@ _Py_GetAllocatedBlocks(void)
/* Special bytes broadcast into debug memory blocks at appropriate times.
* Strings of these are unlikely to be valid addresses, floats, ints or
* 7-bit ASCII. If modified, _PyMem_IsPtrFreed() should be updated as well.
*
* Byte patterns 0xCB, 0xBB and 0xFB have been replaced with 0xCD, 0xDD and
* 0xFD to use the same values than Windows CRT debug malloc() and free().
*/
#undef CLEANBYTE
#undef DEADBYTE
#undef FORBIDDENBYTE
#define CLEANBYTE 0xCB /* clean (newly allocated) memory */
#define DEADBYTE 0xDB /* dead (newly freed) memory */
#define FORBIDDENBYTE 0xFB /* untouchable bytes at each end of a block */
#define CLEANBYTE 0xCD /* clean (newly allocated) memory */
#define DEADBYTE 0xDD /* dead (newly freed) memory */
#define FORBIDDENBYTE 0xFD /* untouchable bytes at each end of a block */
static size_t serialno = 0; /* incremented on each debug {m,re}alloc */