56c4f2bfd4
The bulk of this PR is authored by @lightclient , in the original EOF-work. More recently, the code has been picked up and reworked for the new EOF specification, by @MariusVanDerWijden , in https://github.com/ethereum/go-ethereum/pull/29518, and also @shemnon has contributed with fixes. This PR is an attempt to start eating the elephant one small bite at a time, by selecting only the eof-validation as a standalone piece which can be merged without interfering too much in the core stuff. In this PR: - [x] Validation of eof containers, lifted from #29518, along with test-vectors from consensus-tests and fuzzing, to ensure that the move did not lose any functionality. - [x] Definition of eof opcodes, which is a prerequisite for validation - [x] Addition of `undefined` to a jumptable entry item. I'm not super-happy with this, but for the moment it seems the least invasive way to do it. A better way might be to go back and allowing nil-items or nil execute-functions to denote "undefined". - [x] benchmarks of eof validation speed --------- Co-authored-by: lightclient <lightclient@protonmail.com> Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de> Co-authored-by: Danno Ferrin <danno.ferrin@shemnon.com>
55 lines
1.8 KiB
Go
55 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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