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fd859638bd
EIP-7928 brings state reads into consensus by recording accounts and storage accessed during execution in the block access list. As part of the spec, we need to check that there is enough gas available to cover the cost component which doesn't depend on looking up state. If this component can't be covered by the available gas, we exit immediately. The portion of the call dynamic cost which doesn't depend on state look ups: - EIP2929 call costs - value transfer cost - memory expansion cost This PR: - breaks up the "inner" gas calculation for each call variant into a pair of stateless/stateful cost methods - modifies the gas calculation logic of calls to check stateless cost component first, and go out of gas immediately if it is not covered. --------- Co-authored-by: Gary Rong <garyrong0905@gmail.com>
53 lines
1.8 KiB
Go
53 lines
1.8 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"github.com/holiman/uint256"
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)
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// Gas costs
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const (
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GasQuickStep uint64 = 2
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GasFastestStep uint64 = 3
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GasFastishStep uint64 = 4
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GasFastStep uint64 = 5
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GasMidStep uint64 = 8
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GasSlowStep uint64 = 10
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GasExtStep uint64 = 20
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)
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// callGas returns the actual gas cost of the call.
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//
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// The cost of gas was changed during the homestead price change HF.
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// As part of EIP 150 (TangerineWhistle), the returned gas is gas - base * 63 / 64.
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func callGas(isEip150 bool, availableGas, base uint64, callCost *uint256.Int) (uint64, error) {
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if isEip150 {
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availableGas = availableGas - base
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gas := availableGas - availableGas/64
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// If the bit length exceeds 64 bit we know that the newly calculated "gas" for EIP150
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// is smaller than the requested amount. Therefore we return the new gas instead
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// of returning an error.
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if !callCost.IsUint64() || gas < callCost.Uint64() {
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return gas, nil
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}
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}
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if !callCost.IsUint64() {
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return 0, ErrGasUintOverflow
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}
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return callCost.Uint64(), nil
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}
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