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author | jm <jm.huang@cobinhood.com> | 2019-01-15 00:48:13 +0800 |
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committer | Jhih-Ming Huang <jm.huang@cobinhood.com> | 2019-05-06 10:44:03 +0800 |
commit | 266068a53cdf9e06acacf982d63653c03133a634 (patch) | |
tree | af2d74e6adb309adfe39bafaa2f540fe0bcd1a31 /core/vm/evm/gas.go | |
parent | d41cb421d755b8f0bca87b7476f26aa4b879b9d9 (diff) | |
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core: vm: refactor file structure
For support other vm types, this pr modified the core/vm file
structures.
Diffstat (limited to 'core/vm/evm/gas.go')
-rw-r--r-- | core/vm/evm/gas.go | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/core/vm/evm/gas.go b/core/vm/evm/gas.go new file mode 100644 index 000000000..edd772423 --- /dev/null +++ b/core/vm/evm/gas.go @@ -0,0 +1,59 @@ +// 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 evm + +import ( + "math/big" + + "github.com/dexon-foundation/dexon/params" +) + +// Gas costs +const ( + GasQuickStep uint64 = 2 + GasFastestStep uint64 = 3 + GasFastStep uint64 = 5 + GasMidStep uint64 = 8 + GasSlowStep uint64 = 10 + GasExtStep uint64 = 20 + + GasReturn uint64 = 0 + GasStop uint64 = 0 + GasContractByte uint64 = 200 +) + +// calcGas returns the actual gas cost of the call. +// +// The cost of gas was changed during the homestead price change HF. To allow for EIP150 +// to be implemented. The returned gas is gas - base * 63 / 64. +func callGas(gasTable params.GasTable, availableGas, base uint64, callCost *big.Int) (uint64, error) { + if gasTable.CreateBySuicide > 0 { + 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. Therefor we return the new gas instead + // of returning an error. + if callCost.BitLen() > 64 || gas < callCost.Uint64() { + return gas, nil + } + } + if callCost.BitLen() > 64 { + return 0, errGasUintOverflow + } + + return callCost.Uint64(), nil +} |