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bitfield length limit style improvement

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protolambda 2019-04-12 09:12:37 +10:00
parent 509354582c
commit 7ffcdcfd7c
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1 changed files with 2 additions and 4 deletions
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specs/core/0_beacon-chain.md
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@ -1817,10 +1817,8 @@ def update_justification_and_finalization(state: BeaconState) -> None:
new_justified_epoch = state.current_justified_epoch new_justified_epoch = state.current_justified_epoch
new_finalized_epoch = state.finalized_epoch new_finalized_epoch = state.finalized_epoch
# Rotate the justification bitfield up one epoch to make room for the current epoch # Rotate the justification bitfield up one epoch to make room for the current epoch (and limit to 64 bits)
state.justification_bitfield <<= 1 state.justification_bitfield = (state.justification_bitfield << 1) % 2**64
# Python var length integers: justification bitfield is 64 bits, and may not be bigger (for SSZ serialization)
state.justification_bitfield &= (1 << 64) - 1
# If the previous epoch gets justified, fill the second last bit # If the previous epoch gets justified, fill the second last bit
previous_boundary_attesting_balance = get_attesting_balance(state, get_previous_epoch_boundary_attestations(state)) previous_boundary_attesting_balance = get_attesting_balance(state, get_previous_epoch_boundary_attestations(state))
if previous_boundary_attesting_balance * 3 >= get_previous_total_balance(state) * 2: if previous_boundary_attesting_balance * 3 >= get_previous_total_balance(state) * 2: