543 lines
19 KiB
Rust
543 lines
19 KiB
Rust
#![allow(dead_code)]
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use {
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crate::{
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bucket_storage::{BucketCapacity, BucketOccupied, BucketStorage, Capacity, IncludeHeader},
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RefCount,
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},
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bv::BitVec,
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modular_bitfield::prelude::*,
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num_enum::FromPrimitive,
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solana_sdk::{clock::Slot, pubkey::Pubkey},
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std::{fmt::Debug, marker::PhantomData},
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};
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/// in use/occupied
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const OCCUPIED_OCCUPIED: u8 = 1;
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/// free, ie. not occupied
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const OCCUPIED_FREE: u8 = 0;
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impl BucketCapacity for BucketWithHeader {
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fn capacity(&self) -> u64 {
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self.capacity_pow2.capacity()
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}
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fn capacity_pow2(&self) -> u8 {
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self.capacity_pow2.capacity_pow2()
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}
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}
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/// header for elements in a bucket
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/// needs to be multiple of size_of::<u64>()
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#[derive(Copy, Clone)]
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#[repr(C)]
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struct DataBucketRefCountOccupiedHeader {
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/// stores `ref_count` and
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/// occupied = OCCUPIED_OCCUPIED or OCCUPIED_FREE
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packed_ref_count: PackedRefCount,
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}
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#[derive(Debug, PartialEq)]
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pub enum OccupyIfMatches {
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/// this entry is occupied and contains the same pubkey but with a different value, so this entry could not be updated
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FoundDuplicate,
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/// this entry was free and contains this pubkey and either value matched or the value was written to match
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SuccessfulInit,
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/// this entry had a different pubkey
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PubkeyMismatch,
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}
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/// allocated in `contents` in a BucketStorage
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#[derive(Copy, Clone)]
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#[repr(C)]
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pub struct BucketWithHeader {
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capacity_pow2: Capacity,
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}
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impl BucketOccupied for BucketWithHeader {
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fn occupy(&mut self, element: &mut [u8], ix: usize) {
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assert!(self.is_free(element, ix));
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let entry = get_mut_from_bytes::<DataBucketRefCountOccupiedHeader>(element);
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entry.packed_ref_count.set_occupied(OCCUPIED_OCCUPIED);
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}
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fn free(&mut self, element: &mut [u8], ix: usize) {
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assert!(!self.is_free(element, ix));
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let entry = get_mut_from_bytes::<DataBucketRefCountOccupiedHeader>(element);
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entry.packed_ref_count.set_occupied(OCCUPIED_FREE);
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}
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fn is_free(&self, element: &[u8], _ix: usize) -> bool {
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let entry = get_from_bytes::<DataBucketRefCountOccupiedHeader>(element);
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entry.packed_ref_count.occupied() == OCCUPIED_FREE
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}
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fn offset_to_first_data() -> usize {
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std::mem::size_of::<DataBucketRefCountOccupiedHeader>()
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}
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fn new(capacity: Capacity) -> Self {
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assert!(matches!(capacity, Capacity::Pow2(_)));
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Self {
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capacity_pow2: capacity,
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}
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}
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}
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/// allocated in `contents` in a BucketStorage
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#[derive(Debug)]
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pub struct IndexBucketUsingBitVecBits<T: PartialEq + 'static> {
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/// 2 bits per entry that represent a 4 state enum tag
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pub enum_tag: BitVec,
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/// number of elements allocated
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capacity: u64,
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_phantom: PhantomData<&'static T>,
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}
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impl<T: Copy + PartialEq + 'static> IndexBucketUsingBitVecBits<T> {
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/// set the 2 bits (first and second) in `enum_tag`
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fn set_bits(&mut self, ix: u64, first: bool, second: bool) {
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self.enum_tag.set(ix * 2, first);
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self.enum_tag.set(ix * 2 + 1, second);
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}
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/// get the 2 bits (first and second) in `enum_tag`
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fn get_bits(&self, ix: u64) -> (bool, bool) {
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(self.enum_tag.get(ix * 2), self.enum_tag.get(ix * 2 + 1))
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}
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/// turn the tag into bits and store them
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fn set_enum_tag(&mut self, ix: u64, value: OccupiedEnumTag) {
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let value = value as u8;
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self.set_bits(ix, (value & 2) == 2, (value & 1) == 1);
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}
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/// read the bits and convert them to an enum tag
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fn get_enum_tag(&self, ix: u64) -> OccupiedEnumTag {
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let (first, second) = self.get_bits(ix);
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let tag = (first as u8 * 2) + second as u8;
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num_enum::FromPrimitive::from_primitive(tag)
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}
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}
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impl<T: Copy + PartialEq + 'static> BucketOccupied for IndexBucketUsingBitVecBits<T> {
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fn occupy(&mut self, element: &mut [u8], ix: usize) {
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assert!(self.is_free(element, ix));
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self.set_enum_tag(ix as u64, OccupiedEnumTag::ZeroSlots);
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}
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fn free(&mut self, element: &mut [u8], ix: usize) {
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assert!(!self.is_free(element, ix));
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self.set_enum_tag(ix as u64, OccupiedEnumTag::Free);
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}
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fn is_free(&self, _element: &[u8], ix: usize) -> bool {
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self.get_enum_tag(ix as u64) == OccupiedEnumTag::Free
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}
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fn offset_to_first_data() -> usize {
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// no header, nothing stored in data stream
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0
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}
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fn new(capacity: Capacity) -> Self {
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Self {
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// note: twice as many bits allocated as `num_elements` because we store 2 bits per element
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enum_tag: BitVec::new_fill(false, capacity.capacity() * 2),
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capacity: capacity.capacity(),
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_phantom: PhantomData,
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}
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}
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/// in this impl, the enum tag is stored in in-memory bit vec and there is more information than
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/// a single 'occupied' bit. So, this enum_tag needs to be copied over.
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fn copying_entry(
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&mut self,
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_element_new: &mut [u8],
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ix_new: usize,
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other: &Self,
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_element_old: &[u8],
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ix_old: usize,
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) {
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self.set_enum_tag(ix_new as u64, other.get_enum_tag(ix_old as u64));
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}
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}
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impl<T: PartialEq> BucketCapacity for IndexBucketUsingBitVecBits<T> {
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fn capacity(&self) -> u64 {
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self.capacity
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}
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}
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pub type DataBucket = BucketWithHeader;
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pub type IndexBucket<T> = IndexBucketUsingBitVecBits<T>;
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/// contains the index of an entry in the index bucket.
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/// This type allows us to call methods to interact with the index entry on this type.
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pub struct IndexEntryPlaceInBucket<T: 'static> {
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pub ix: u64,
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_phantom: PhantomData<&'static T>,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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/// one instance of this per item in the index
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/// stored in the index bucket
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pub struct IndexEntry<T: Clone + Copy> {
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pub(crate) key: Pubkey, // can this be smaller if we have reduced the keys into buckets already?
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/// depends on the contents of ref_count.slot_count_enum
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contents: SingleElementOrMultipleSlots<T>,
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}
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/// 63 bits available for ref count
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pub(crate) const MAX_LEGAL_REFCOUNT: RefCount = RefCount::MAX >> 1;
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/// hold a big `RefCount` while leaving room for extra bits to be used for things like 'Occupied'
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#[bitfield(bits = 64)]
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#[repr(C)]
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#[derive(Debug, Default, Copy, Clone, Eq, PartialEq)]
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pub(crate) struct PackedRefCount {
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/// whether this entry in the data file is occupied or not
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pub(crate) occupied: B1,
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/// ref_count of this entry. We don't need any where near 63 bits for this value
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pub(crate) ref_count: B63,
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}
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/// required fields when an index element references the data file
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#[repr(C)]
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#[derive(Debug, Default, Copy, Clone, Eq, PartialEq)]
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pub(crate) struct MultipleSlots {
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// if the bucket doubled, the index can be recomputed using storage_cap_and_offset.create_bucket_capacity_pow2
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storage_cap_and_offset: PackedStorage,
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/// num elements in the slot list
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num_slots: Slot,
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}
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impl MultipleSlots {
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pub(crate) fn set_storage_capacity_when_created_pow2(
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&mut self,
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storage_capacity_when_created_pow2: u8,
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) {
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self.storage_cap_and_offset
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.set_capacity_when_created_pow2(storage_capacity_when_created_pow2)
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}
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pub(crate) fn set_storage_offset(&mut self, storage_offset: u64) {
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self.storage_cap_and_offset
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.set_offset_checked(storage_offset)
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.expect("New storage offset must fit into 7 bytes!")
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}
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fn storage_capacity_when_created_pow2(&self) -> u8 {
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self.storage_cap_and_offset.capacity_when_created_pow2()
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}
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fn storage_offset(&self) -> u64 {
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self.storage_cap_and_offset.offset()
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}
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pub(crate) fn num_slots(&self) -> Slot {
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self.num_slots
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}
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pub(crate) fn set_num_slots(&mut self, num_slots: Slot) {
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self.num_slots = num_slots;
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}
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pub(crate) fn data_bucket_ix(&self) -> u64 {
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Self::data_bucket_from_num_slots(self.num_slots())
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}
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/// return closest bucket index fit for the slot slice.
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/// Since bucket size is 2^index, the return value is
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/// min index, such that 2^index >= num_slots
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/// index = ceiling(log2(num_slots))
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/// special case, when slot slice empty, return 0th index.
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pub(crate) fn data_bucket_from_num_slots(num_slots: Slot) -> u64 {
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// Compute the ceiling of log2 for integer
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if num_slots == 0 {
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0
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} else {
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(Slot::BITS - (num_slots - 1).leading_zeros()) as u64
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}
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}
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/// This function maps the original data location into an index in the current bucket storage.
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/// This is coupled with how we resize bucket storages.
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pub(crate) fn data_loc(&self, storage: &BucketStorage<DataBucket>) -> u64 {
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self.storage_offset()
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<< (storage.contents.capacity_pow2() - self.storage_capacity_when_created_pow2())
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}
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/// ref_count is stored in the header per cell, in `packed_ref_count`
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pub fn set_ref_count(
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data_bucket: &mut BucketStorage<DataBucket>,
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data_ix: u64,
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ref_count: RefCount,
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) {
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data_bucket
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.get_header_mut::<DataBucketRefCountOccupiedHeader>(data_ix)
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.packed_ref_count
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.set_ref_count(ref_count);
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}
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/// ref_count is stored in the header per cell, in `packed_ref_count`
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pub fn ref_count(data_bucket: &BucketStorage<DataBucket>, data_ix: u64) -> RefCount {
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data_bucket
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.get_header::<DataBucketRefCountOccupiedHeader>(data_ix)
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.packed_ref_count
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.ref_count()
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}
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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pub(crate) union SingleElementOrMultipleSlots<T: Clone + Copy> {
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/// the slot list contains a single element. No need for an entry in the data file.
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/// The element itself is stored in place in the index entry
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pub(crate) single_element: T,
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/// the slot list contains more than one element. This contains the reference to the data file.
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pub(crate) multiple_slots: MultipleSlots,
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}
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/// just the values for `OccupiedEnum`
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/// This excludes the contents of any enum value.
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#[derive(PartialEq, FromPrimitive, Debug)]
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#[repr(u8)]
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enum OccupiedEnumTag {
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#[default]
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Free = 0,
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ZeroSlots = 1,
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OneSlotInIndex = 2,
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MultipleSlots = 3,
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}
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#[repr(u8)]
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#[derive(Debug, Eq, PartialEq)]
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pub(crate) enum OccupiedEnum<'a, T> {
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/// this spot is not occupied.
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/// ALL other enum values ARE occupied.
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Free = OccupiedEnumTag::Free as u8,
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/// zero slots in the slot list
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ZeroSlots = OccupiedEnumTag::ZeroSlots as u8,
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/// one slot in the slot list, it is stored in the index
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OneSlotInIndex(&'a T) = OccupiedEnumTag::OneSlotInIndex as u8,
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/// data is stored in data file
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MultipleSlots(&'a MultipleSlots) = OccupiedEnumTag::MultipleSlots as u8,
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}
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/// Pack the storage offset and capacity-when-created-pow2 fields into a single u64
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#[bitfield(bits = 64)]
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#[repr(C)]
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#[derive(Debug, Default, Copy, Clone, Eq, PartialEq)]
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struct PackedStorage {
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capacity_when_created_pow2: B8,
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offset: B56,
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}
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impl<T: Copy + PartialEq + 'static> IndexEntryPlaceInBucket<T> {
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pub(crate) fn get_slot_count_enum<'a>(
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&self,
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index_bucket: &'a BucketStorage<IndexBucket<T>>,
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) -> OccupiedEnum<'a, T> {
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let enum_tag = index_bucket.contents.get_enum_tag(self.ix);
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let index_entry = index_bucket.get::<IndexEntry<T>>(self.ix);
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match enum_tag {
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OccupiedEnumTag::Free => OccupiedEnum::Free,
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OccupiedEnumTag::ZeroSlots => OccupiedEnum::ZeroSlots,
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OccupiedEnumTag::OneSlotInIndex => unsafe {
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OccupiedEnum::OneSlotInIndex(&index_entry.contents.single_element)
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},
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OccupiedEnumTag::MultipleSlots => unsafe {
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OccupiedEnum::MultipleSlots(&index_entry.contents.multiple_slots)
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},
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}
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}
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/// return Some(MultipleSlots) if this item's data is stored in the data file
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pub(crate) fn get_multiple_slots_mut<'a>(
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&self,
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index_bucket: &'a mut BucketStorage<IndexBucket<T>>,
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) -> Option<&'a mut MultipleSlots> {
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let enum_tag = index_bucket.contents.get_enum_tag(self.ix);
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unsafe {
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match enum_tag {
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OccupiedEnumTag::MultipleSlots => {
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let index_entry = index_bucket.get_mut::<IndexEntry<T>>(self.ix);
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Some(&mut index_entry.contents.multiple_slots)
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}
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_ => None,
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}
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}
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}
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/// make this index entry reflect `value`
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pub(crate) fn set_slot_count_enum_value<'a>(
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&self,
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index_bucket: &'a mut BucketStorage<IndexBucket<T>>,
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value: OccupiedEnum<'a, T>,
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) {
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let tag = match value {
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OccupiedEnum::Free => OccupiedEnumTag::Free,
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OccupiedEnum::ZeroSlots => OccupiedEnumTag::ZeroSlots,
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OccupiedEnum::OneSlotInIndex(single_element) => {
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let index_entry = index_bucket.get_mut::<IndexEntry<T>>(self.ix);
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index_entry.contents.single_element = *single_element;
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OccupiedEnumTag::OneSlotInIndex
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}
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OccupiedEnum::MultipleSlots(multiple_slots) => {
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let index_entry = index_bucket.get_mut::<IndexEntry<T>>(self.ix);
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index_entry.contents.multiple_slots = *multiple_slots;
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OccupiedEnumTag::MultipleSlots
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}
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};
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index_bucket.contents.set_enum_tag(self.ix, tag);
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}
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pub fn init(&self, index_bucket: &mut BucketStorage<IndexBucket<T>>, pubkey: &Pubkey) {
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self.set_slot_count_enum_value(index_bucket, OccupiedEnum::ZeroSlots);
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let index_entry = index_bucket.get_mut::<IndexEntry<T>>(self.ix);
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index_entry.key = *pubkey;
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}
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/// If the entry matches the pubkey and is unoccupied, then store `data` here and occupy the entry.
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pub(crate) fn occupy_if_matches(
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&self,
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index_bucket: &mut BucketStorage<IndexBucket<T>>,
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data: &T,
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k: &Pubkey,
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) -> OccupyIfMatches {
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let index_entry = index_bucket.get::<IndexEntry<T>>(self.ix);
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if &index_entry.key == k {
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let enum_tag = index_bucket.contents.get_enum_tag(self.ix);
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if unsafe { &index_entry.contents.single_element } == data {
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assert_eq!(
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enum_tag,
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OccupiedEnumTag::Free,
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"index asked to insert the same data twice"
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);
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index_bucket
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.contents
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.set_enum_tag(self.ix, OccupiedEnumTag::OneSlotInIndex);
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OccupyIfMatches::SuccessfulInit
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} else if enum_tag == OccupiedEnumTag::Free {
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// pubkey is same, but value is different, so update value
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self.set_slot_count_enum_value(index_bucket, OccupiedEnum::OneSlotInIndex(data));
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OccupyIfMatches::SuccessfulInit
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} else {
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// found occupied duplicate of this pubkey
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OccupyIfMatches::FoundDuplicate
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}
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} else {
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OccupyIfMatches::PubkeyMismatch
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}
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}
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pub(crate) fn read_value<'a>(
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&self,
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index_bucket: &'a BucketStorage<IndexBucket<T>>,
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data_buckets: &'a [BucketStorage<DataBucket>],
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) -> (&'a [T], RefCount) {
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let mut ref_count = 1;
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let slot_list = match self.get_slot_count_enum(index_bucket) {
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OccupiedEnum::ZeroSlots => {
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// num_slots is 0. This means empty slot list and ref_count=1
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&[]
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}
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OccupiedEnum::OneSlotInIndex(single_element) => {
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// only element is stored in the index entry
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std::slice::from_ref(single_element)
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}
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OccupiedEnum::MultipleSlots(multiple_slots) => {
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// slot list and ref_count are in data file
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let data_bucket_ix =
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MultipleSlots::data_bucket_from_num_slots(multiple_slots.num_slots);
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let data_bucket = &data_buckets[data_bucket_ix as usize];
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let loc = multiple_slots.data_loc(data_bucket);
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assert!(!data_bucket.is_free(loc));
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ref_count = MultipleSlots::ref_count(data_bucket, loc);
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data_bucket.get_slice::<T>(loc, multiple_slots.num_slots, IncludeHeader::NoHeader)
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}
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_ => {
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panic!("trying to read data from a free entry");
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}
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};
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(slot_list, ref_count)
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}
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pub fn new(ix: u64) -> Self {
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Self {
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ix,
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_phantom: PhantomData,
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}
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}
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pub fn key<'a>(&self, index_bucket: &'a BucketStorage<IndexBucket<T>>) -> &'a Pubkey {
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let entry: &IndexEntry<T> = index_bucket.get(self.ix);
|
|
&entry.key
|
|
}
|
|
}
|
|
|
|
fn get_from_bytes<T>(item_slice: &[u8]) -> &T {
|
|
debug_assert!(std::mem::size_of::<T>() <= item_slice.len());
|
|
let item = item_slice.as_ptr() as *const T;
|
|
debug_assert!(item as usize % std::mem::align_of::<T>() == 0);
|
|
unsafe { &*item }
|
|
}
|
|
|
|
fn get_mut_from_bytes<T>(item_slice: &mut [u8]) -> &mut T {
|
|
debug_assert!(std::mem::size_of::<T>() <= item_slice.len());
|
|
let item = item_slice.as_mut_ptr() as *mut T;
|
|
debug_assert!(item as usize % std::mem::align_of::<T>() == 0);
|
|
unsafe { &mut *item }
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
/// verify that accessors for storage_offset and capacity_when_created are
|
|
/// correct and independent
|
|
#[test]
|
|
fn test_api() {
|
|
for offset in [0, 1, u32::MAX as u64] {
|
|
let mut multiple_slots = MultipleSlots::default();
|
|
|
|
if offset != 0 {
|
|
multiple_slots.set_storage_offset(offset);
|
|
}
|
|
assert_eq!(multiple_slots.storage_offset(), offset);
|
|
assert_eq!(multiple_slots.storage_capacity_when_created_pow2(), 0);
|
|
for pow in [1, 255, 0] {
|
|
multiple_slots.set_storage_capacity_when_created_pow2(pow);
|
|
assert_eq!(multiple_slots.storage_offset(), offset);
|
|
assert_eq!(multiple_slots.storage_capacity_when_created_pow2(), pow);
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_size() {
|
|
assert_eq!(std::mem::size_of::<PackedStorage>(), 1 + 7);
|
|
assert_eq!(std::mem::size_of::<IndexEntry<u64>>(), 32 + 8 + 8);
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic(expected = "New storage offset must fit into 7 bytes!")]
|
|
fn test_set_storage_offset_value_too_large() {
|
|
let too_big = 1 << 56;
|
|
let mut multiple_slots = MultipleSlots::default();
|
|
multiple_slots.set_storage_offset(too_big);
|
|
}
|
|
|
|
#[test]
|
|
fn test_data_bucket_from_num_slots() {
|
|
for n in 0..512 {
|
|
assert_eq!(
|
|
MultipleSlots::data_bucket_from_num_slots(n),
|
|
(n as f64).log2().ceil() as u64
|
|
);
|
|
}
|
|
assert_eq!(
|
|
MultipleSlots::data_bucket_from_num_slots(u32::MAX as u64),
|
|
32
|
|
);
|
|
assert_eq!(
|
|
MultipleSlots::data_bucket_from_num_slots(u32::MAX as u64 + 1),
|
|
32
|
|
);
|
|
assert_eq!(
|
|
MultipleSlots::data_bucket_from_num_slots(u32::MAX as u64 + 2),
|
|
33
|
|
);
|
|
}
|
|
}
|