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SDK: Ovf in epoch_schedule

This commit is contained in:
Trent Nelson 2021-02-16 21:57:34 -07:00 committed by Trent Nelson
parent 98d7673a03
commit 854e6766ce
1 changed files with 39 additions and 17 deletions
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56
sdk/program/src/epoch_schedule.rs
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@ -1,4 +1,3 @@
#![allow(clippy::integer_arithmetic)]
//! configuration for epochs, slots
/// 1 Epoch = 400 * 8192 ms ~= 55 minutes
@ -86,7 +85,9 @@ impl EpochSchedule {
/// get the length of the given epoch (in slots)
pub fn get_slots_in_epoch(&self, epoch: Epoch) -> u64 {
if epoch < self.first_normal_epoch {
2u64.pow(epoch as u32 + MINIMUM_SLOTS_PER_EPOCH.trailing_zeros() as u32)
2u64.saturating_pow(
(epoch as u32).saturating_add(MINIMUM_SLOTS_PER_EPOCH.trailing_zeros() as u32),
)
} else {
self.slots_per_epoch
}
@ -97,11 +98,17 @@ impl EpochSchedule {
pub fn get_leader_schedule_epoch(&self, slot: Slot) -> Epoch {
if slot < self.first_normal_slot {
// until we get to normal slots, behave as if leader_schedule_slot_offset == slots_per_epoch
self.get_epoch_and_slot_index(slot).0 + 1
self.get_epoch_and_slot_index(slot).0.saturating_add(1)
} else {
let new_slots_since_first_normal_slot = slot.saturating_sub(self.first_normal_slot);
let new_first_normal_leader_schedule_slot =
new_slots_since_first_normal_slot.saturating_add(self.leader_schedule_slot_offset);
let new_epochs_since_first_normal_leader_schedule =
new_first_normal_leader_schedule_slot
.checked_div(self.slots_per_epoch)
.unwrap_or(0);
self.first_normal_epoch
+ (slot - self.first_normal_slot + self.leader_schedule_slot_offset)
/ self.slots_per_epoch
.saturating_add(new_epochs_since_first_normal_leader_schedule)
}
}
@ -113,36 +120,51 @@ impl EpochSchedule {
/// get epoch and offset into the epoch for the given slot
pub fn get_epoch_and_slot_index(&self, slot: Slot) -> (Epoch, u64) {
if slot < self.first_normal_slot {
let epoch = (slot + MINIMUM_SLOTS_PER_EPOCH + 1)
let epoch = slot
.saturating_add(MINIMUM_SLOTS_PER_EPOCH)
.saturating_add(1)
.next_power_of_two()
.trailing_zeros()
- MINIMUM_SLOTS_PER_EPOCH.trailing_zeros()
- 1;
.saturating_sub(MINIMUM_SLOTS_PER_EPOCH.trailing_zeros())
.saturating_sub(1);
let epoch_len = 2u64.pow(epoch + MINIMUM_SLOTS_PER_EPOCH.trailing_zeros());
let epoch_len =
2u64.saturating_pow(epoch.saturating_add(MINIMUM_SLOTS_PER_EPOCH.trailing_zeros()));
(
u64::from(epoch),
slot - (epoch_len - MINIMUM_SLOTS_PER_EPOCH),
slot.saturating_sub(epoch_len.saturating_sub(MINIMUM_SLOTS_PER_EPOCH)),
)
} else {
(
self.first_normal_epoch + ((slot - self.first_normal_slot) / self.slots_per_epoch),
(slot - self.first_normal_slot) % self.slots_per_epoch,
)
let normal_slot_index = slot.saturating_sub(self.first_normal_slot);
let normal_epoch_index = normal_slot_index
.checked_div(self.slots_per_epoch)
.unwrap_or(0);
let epoch = self.first_normal_epoch.saturating_add(normal_epoch_index);
let slot_index = normal_slot_index
.checked_rem(self.slots_per_epoch)
.unwrap_or(0);
(epoch, slot_index)
}
}
pub fn get_first_slot_in_epoch(&self, epoch: Epoch) -> Slot {
if epoch <= self.first_normal_epoch {
(2u64.pow(epoch as u32) - 1) * MINIMUM_SLOTS_PER_EPOCH
2u64.saturating_pow(epoch as u32)
.saturating_sub(1)
.saturating_mul(MINIMUM_SLOTS_PER_EPOCH)
} else {
(epoch - self.first_normal_epoch) * self.slots_per_epoch + self.first_normal_slot
epoch
.saturating_sub(self.first_normal_epoch)
.saturating_mul(self.slots_per_epoch)
.saturating_add(self.first_normal_slot)
}
}
pub fn get_last_slot_in_epoch(&self, epoch: Epoch) -> Slot {
self.get_first_slot_in_epoch(epoch) + self.get_slots_in_epoch(epoch) - 1
self.get_first_slot_in_epoch(epoch)
.saturating_add(self.get_slots_in_epoch(epoch))
.saturating_sub(1)
}
}