go-pulse/core/vm/gas.go
Paweł Bylica cf6674539c
core/vm: use uint256 in EVM implementation (#20787)
* core/vm: use fixed uint256 library instead of big

* core/vm: remove intpools

* core/vm: upgrade uint256, fixes uint256.NewFromBig

* core/vm: use uint256.Int by value in Stack

* core/vm: upgrade uint256 to v1.0.0

* core/vm: don't preallocate space for 1024 stack items (only 16)

Co-authored-by: Martin Holst Swende <martin@swende.se>
2020-06-08 15:24:40 +03:00

54 lines
1.8 KiB
Go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package vm
import (
"github.com/holiman/uint256"
)
// Gas costs
const (
GasQuickStep uint64 = 2
GasFastestStep uint64 = 3
GasFastStep uint64 = 5
GasMidStep uint64 = 8
GasSlowStep uint64 = 10
GasExtStep uint64 = 20
)
// callGas returns the actual gas cost of the call.
//
// The cost of gas was changed during the homestead price change HF.
// As part of EIP 150 (TangerineWhistle), the returned gas is gas - base * 63 / 64.
func callGas(isEip150 bool, availableGas, base uint64, callCost *uint256.Int) (uint64, error) {
if isEip150 {
availableGas = availableGas - base
gas := availableGas - availableGas/64
// If the bit length exceeds 64 bit we know that the newly calculated "gas" for EIP150
// is smaller than the requested amount. Therefore we return the new gas instead
// of returning an error.
if !callCost.IsUint64() || gas < callCost.Uint64() {
return gas, nil
}
}
if !callCost.IsUint64() {
return 0, ErrGasUintOverflow
}
return callCost.Uint64(), nil
}