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add support for custom heap and page tags, upstream of python/cpython#113742

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Daan 2024-05-19 08:06:32 -07:00
parent 710d6138c7
commit 0c4041fa53
5 changed files with 43 additions and 16 deletions
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31
src/heap.c
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@ -204,11 +204,13 @@ mi_heap_t* mi_heap_get_backing(void) {
return bheap;
}
void _mi_heap_init(mi_heap_t* heap, mi_tld_t* tld, mi_arena_id_t arena_id) {
void _mi_heap_init(mi_heap_t* heap, mi_tld_t* tld, mi_arena_id_t arena_id, bool noreclaim, uint8_t tag) {
_mi_memcpy_aligned(heap, &_mi_heap_empty, sizeof(mi_heap_t));
heap->tld = tld;
heap->thread_id = _mi_thread_id();
heap->arena_id = arena_id;
heap->thread_id = _mi_thread_id();
heap->arena_id = arena_id;
heap->no_reclaim = noreclaim;
heap->tag = tag;
if (heap == tld->heap_backing) {
_mi_random_init(&heap->random);
}
@ -218,18 +220,17 @@ void _mi_heap_init(mi_heap_t* heap, mi_tld_t* tld, mi_arena_id_t arena_id) {
heap->cookie = _mi_heap_random_next(heap) | 1;
heap->keys[0] = _mi_heap_random_next(heap);
heap->keys[1] = _mi_heap_random_next(heap);
// push on the thread local heaps list
heap->next = heap->tld->heaps;
heap->tld->heaps = heap;
}
mi_decl_nodiscard mi_heap_t* mi_heap_new_in_arena(mi_arena_id_t arena_id) {
mi_heap_t* bheap = mi_heap_get_backing();
mi_heap_t* heap = mi_heap_malloc_tp(bheap, mi_heap_t); // todo: OS allocate in secure mode?
if (heap == NULL) return NULL;
_mi_heap_init(heap, bheap->tld, arena_id);
// don't reclaim abandoned pages or otherwise destroy is unsafe
heap->no_reclaim = true;
// push on the thread local heaps list
heap->next = heap->tld->heaps;
heap->tld->heaps = heap;
// don't reclaim abandoned pages or otherwise destroy is unsafe
_mi_heap_init(heap, bheap->tld, arena_id, true /* no reclaim */, 0 /* default tag */);
return heap;
}
@ -287,6 +288,18 @@ static void mi_heap_free(mi_heap_t* heap) {
mi_free(heap);
}
// return a heap on the same thread as `heap` specialized for the specified tag (if it exists)
mi_heap_t* _mi_heap_by_tag(mi_heap_t* heap, uint8_t tag) {
if (heap->tag == tag) {
return heap;
}
for (mi_heap_t *curr = heap->tld->heaps; curr != NULL; curr = curr->next) {
if (curr->tag == tag) {
return curr;
}
}
return NULL;
}
/* -----------------------------------------------------------
Heap destroy