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support zero-initialized memory detection

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This commit is contained in:
daan 2019-09-02 13:16:52 -07:00
parent 216d75a222
commit d1bd1644d5
9 changed files with 123 additions and 48 deletions
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7
include/mimalloc-internal.h
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@ -46,12 +46,12 @@ void* _mi_os_alloc(size_t size, mi_stats_t* stats); // to allocat
void _mi_os_free(void* p, size_t size, mi_stats_t* stats); // to free thread local data
// memory.c
void* _mi_mem_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* large, size_t* id, mi_os_tld_t* tld);
void* _mi_mem_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* large, bool* is_zero, size_t* id, mi_os_tld_t* tld);
void _mi_mem_free(void* p, size_t size, size_t id, mi_stats_t* stats);
bool _mi_mem_reset(void* p, size_t size, mi_stats_t* stats);
bool _mi_mem_unreset(void* p, size_t size, mi_stats_t* stats);
bool _mi_mem_commit(void* p, size_t size, mi_stats_t* stats);
bool _mi_mem_unreset(void* p, size_t size, bool* is_zero, mi_stats_t* stats);
bool _mi_mem_commit(void* p, size_t size, bool* is_zero, mi_stats_t* stats);
bool _mi_mem_protect(void* addr, size_t size);
bool _mi_mem_unprotect(void* addr, size_t size);
@ -101,6 +101,7 @@ void* _mi_heap_malloc_zero(mi_heap_t* heap, size_t size, bool zero);
void* _mi_heap_realloc_zero(mi_heap_t* heap, void* p, size_t newsize, bool zero);
mi_block_t* _mi_page_ptr_unalign(const mi_segment_t* segment, const mi_page_t* page, const void* p);
bool _mi_free_delayed_block(mi_block_t* block);
void _mi_block_zero_init(void* p, size_t size);
#if MI_DEBUG>1
bool _mi_page_is_valid(mi_page_t* page);

9
include/mimalloc-types.h
View file

@ -131,9 +131,11 @@ typedef enum mi_delayed_e {
// test if both are false (`value == 0`) in the `mi_free` routine.
typedef union mi_page_flags_u {
uint16_t value;
uint8_t full_aligned;
struct {
bool in_full;
bool has_aligned;
bool in_full:1;
bool has_aligned:1;
bool is_zero; // `true` if the blocks in the free list are zero initialized
};
} mi_page_flags_t;
@ -165,7 +167,8 @@ typedef struct mi_page_s {
bool segment_in_use:1; // `true` if the segment allocated this page
bool is_reset:1; // `true` if the page memory was reset
bool is_committed:1; // `true` if the page virtual memory is committed
bool is_zero_init:1; // `true` if the page was zero initialized
// layout like this to optimize access in `mi_malloc` and `mi_free`
uint16_t capacity; // number of blocks committed, must be the first field, see `segment.c:page_clear`
uint16_t reserved; // number of blocks reserved in memory