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wip: initial work on tracking source of an allocation in debug mode

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daan 2020-02-11 09:37:26 -08:00
parent 0a77b7423f
commit 4090561975
10 changed files with 381 additions and 164 deletions
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41
include/mimalloc-types.h
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@ -269,6 +269,33 @@ typedef struct mi_segment_s {
} mi_segment_t;
// ------------------------------------------------------
// In debug mode there is a padding stucture at the end
// of the blocks to check for buffer overflows.
// ------------------------------------------------------
#if defined(MI_PADDING)
// compressed location:
// lsb=1: bit 63-32: relative file name char* (to `mi_fname_base`), bit 31-1: line number
// lsb=0: bit 63-01: return address
typedef int64_t mi_source_t;
typedef struct mi_padding_s {
uint32_t canary; // encoded block value to check validity of the padding (in case of heap block overflow)
uint32_t delta; // padding bytes before the block. (mi_usable_size(p) - delta == exact allocated bytes)
mi_source_t source; // source location
} 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_SOURCE_PARAM , mi_source_t source
#define MI_SOURCE_ARG , source
#define MI_SOURCE_RET , ((intptr_t)mi_return_address() << (intptr_t)1)
#else
#define MI_PADDING_SIZE 0
#define MI_PADDING_WSIZE 0
#define MI_SOURCE_PARAM
#define MI_SOURCE_ARG
#define MI_SOURCE_RET
#endif
// ------------------------------------------------------
// Heaps
// Provide first-class heaps to allocate from.
@ -301,20 +328,6 @@ typedef struct mi_random_cxt_s {
int output_available;
} mi_random_ctx_t;
// In debug mode there is a padding stucture at the end of the blocks to check for buffer overflows
#if defined(MI_PADDING)
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)
} 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)
#else
#define MI_PADDING_SIZE 0
#define MI_PADDING_WSIZE 0
#endif
#define MI_PAGES_DIRECT (MI_SMALL_WSIZE_MAX + MI_PADDING_WSIZE + 1)