// Override new operator on chunk to use mmap to allocate kChunkSize
void* Chunk::operator new(std::size_t count __attribute__((unused))) noexcept {
assert(count == sizeof(Chunk));
void* mem = MapAligned(kChunkSize, kChunkSize);
if (!mem) {
abort(); //throw std::bad_alloc;
}
return mem;
}
// Override new operator on HeapImpl to use mmap to allocate a page
void* HeapImpl::operator new(std::size_t count __attribute__((unused))) noexcept {
assert(count == sizeof(HeapImpl));
void* mem = MapAligned(kPageSize, kPageSize);
if (!mem) {
abort(); // throw std::bad_alloc;
}
heap_count++;
return mem;
}
void* HeapImpl::MapAlloc(size_t size) {
size = (size + kPageSize - 1) & ~(kPageSize - 1);
MapAllocation* allocation = reinterpret_cast<MapAllocation*>(AllocLocked(sizeof(MapAllocation)));
void* ptr = MapAligned(size, kChunkSize);
if (!ptr) {
FreeLocked(allocation);
abort(); // throw std::bad_alloc;
}
allocation->ptr = ptr;
allocation->size = size;
allocation->next = map_allocation_list_;
map_allocation_list_ = allocation;
return ptr;
}
