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add support for extra padding and backtraces

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This commit is contained in:
Daan Leijen 2021-12-09 14:19:41 -08:00
parent 0be71a2cac
commit a84df3795a
6 changed files with 113 additions and 24 deletions
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21
include/mimalloc-types.h
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@ -60,6 +60,18 @@ terms of the MIT license. A copy of the license can be found in the file
#define MI_PADDING 1
#endif
#if !defined(MI_PADDING_EXTRA) // use extra padding bytes?
#define MI_PADDING_EXTRA (64)
#endif
#if !defined(MI_DEBUG_TRACE) // store stack trace at each allocation
#define MI_DEBUG_TRACE 1
#endif
#if !defined(MI_DEBUG_TRACE_LEN) // store stack trace at each allocation
#define MI_DEBUG_TRACE_LEN (6) // store up to N frames
#endif
// Encoded free lists allow detection of corrupted free lists
// and can detect buffer overflows, modify after free, and double `free`s.
@ -356,15 +368,16 @@ typedef struct mi_random_cxt_s {
typedef struct mi_padding_s {
uint32_t canary; // encoded block value to check validity of the padding (in case of overflow)
uint32_t delta; // padding bytes before the block. (mi_usable_size(p) - delta == exact allocated bytes)
#if (MI_DEBUG_TRACE > 0)
void* strace[MI_DEBUG_TRACE_LEN]; // stack trace at allocation time
#endif
} mi_padding_t;
#define MI_PADDING_SIZE (sizeof(mi_padding_t))
#define MI_PADDING_WSIZE ((MI_PADDING_SIZE + MI_INTPTR_SIZE - 1) / MI_INTPTR_SIZE)
#define MI_PADDING_SIZE (sizeof(mi_padding_t) + MI_PADDING_EXTRA)
#else
#define MI_PADDING_SIZE 0
#define MI_PADDING_WSIZE 0
#endif
#define MI_PAGES_DIRECT (MI_SMALL_WSIZE_MAX + MI_PADDING_WSIZE + 1)
#define MI_PAGES_DIRECT (MI_SMALL_WSIZE_MAX + 1)
// A heap owns a set of pages.