nimbus-eth1/nimbus/evm/interpreter/gas_meter.nim

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Nim

# Nimbus
# Copyright (c) 2018-2024 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except
# according to those terms.
{.push raises: [].}
import
eth/common, # GasInt
../evm_errors,
../types
func init*(m: var GasMeter, startGas: GasInt) =
m.gasRemaining = startGas
m.gasRefunded = 0
func consumeGas*(gasMeter: var GasMeter; amount: GasInt; reason: string): EvmResultVoid =
if amount > gasMeter.gasRemaining:
return err(memErr(OutOfGas))
gasMeter.gasRemaining -= amount
ok()
func returnGas*(gasMeter: var GasMeter; amount: GasInt) =
gasMeter.gasRemaining += amount
# some gasRefunded operations still relying
# on negative number
func refundGas*(gasMeter: var GasMeter; amount: GasInt) =
gasMeter.gasRefunded += amount