void* NRT_MemAlign(void **ptr, size_t size, unsigned align) {
AlignHeader *base;
size_t intptr;
unsigned offset;
unsigned remainder;
/* Allocate extra space for padding and book keeping */
size_t total_size = size + 2 * align + sizeof(AlignHeader);
base = (AlignHeader*) NRT_Allocate(total_size);
/* The AlignHeader goes first, so skip sizeof(AlignHeader) */
intptr = (size_t) (base + 1);
/* See if we are aligned */
remainder = intptr % align;
if (remainder == 0){
/* Yes */
offset = 0;
} else {
/* No, move forward `offset` bytes */
offset = align - remainder;
}
/* Store the aligned pointer to the output parameter */
*ptr = (void*) (intptr + offset);
/* Remember the total allocated size */
base->total_size = total_size;
/* Return the pointer for deallocation with NRT_Free() */
return base;
}
MemInfo* NRT_MemInfo_alloc_safe(size_t size) {
void *data = NRT_Allocate(size);
/* Only fill up a couple cachelines with debug markers, to minimize
overhead. */
memset(data, 0xCB, MIN(size, 256));
NRT_Debug(nrt_debug_print("NRT_MemInfo_alloc_safe %p %llu\n", data, size));
return NRT_MemInfo_new(data, size, nrt_internal_dtor_safe, (void*)size);
}
MemInfo* NRT_MemInfo_alloc(size_t size) {
void *data = NRT_Allocate(size);
NRT_Debug(nrt_debug_print("NRT_MemInfo_alloc %p\n", data));
return NRT_MemInfo_new(data, size, nrt_internal_dtor, NULL);
}
MemInfo* NRT_MemInfo_alloc_safe(size_t size) {
void *data = NRT_Allocate(size);
memset(data, 0xCB, size);
NRT_Debug(nrt_debug_print("NRT_MemInfo_alloc_safe %p %llu\n", data, size));
return NRT_MemInfo_new(data, size, nrt_internal_dtor, (void*)size);
}
