github.com/myafeier/go-ethereum@v1.6.8-0.20170719123245-3e0dbe0eaa72/params/protocol_params.go (about) 1 // Copyright 2015 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package params 18 19 import "math/big" 20 21 const ( 22 MaximumExtraDataSize uint64 = 32 // Maximum size extra data may be after Genesis. 23 ExpByteGas uint64 = 10 // Times ceil(log256(exponent)) for the EXP instruction. 24 SloadGas uint64 = 50 // Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added. 25 CallValueTransferGas uint64 = 9000 // Paid for CALL when the value transfer is non-zero. 26 CallNewAccountGas uint64 = 25000 // Paid for CALL when the destination address didn't exist prior. 27 TxGas uint64 = 21000 // Per transaction not creating a contract. NOTE: Not payable on data of calls between transactions. 28 TxGasContractCreation uint64 = 53000 // Per transaction that creates a contract. NOTE: Not payable on data of calls between transactions. 29 TxDataZeroGas uint64 = 4 // Per byte of data attached to a transaction that equals zero. NOTE: Not payable on data of calls between transactions. 30 QuadCoeffDiv uint64 = 512 // Divisor for the quadratic particle of the memory cost equation. 31 SstoreSetGas uint64 = 20000 // Once per SLOAD operation. 32 LogDataGas uint64 = 8 // Per byte in a LOG* operation's data. 33 CallStipend uint64 = 2300 // Free gas given at beginning of call. 34 EcrecoverGas uint64 = 3000 // 35 Sha256WordGas uint64 = 12 // 36 37 Sha3Gas uint64 = 30 // Once per SHA3 operation. 38 Sha256Gas uint64 = 60 // 39 IdentityWordGas uint64 = 3 // 40 Sha3WordGas uint64 = 6 // Once per word of the SHA3 operation's data. 41 SstoreResetGas uint64 = 5000 // Once per SSTORE operation if the zeroness changes from zero. 42 SstoreClearGas uint64 = 5000 // Once per SSTORE operation if the zeroness doesn't change. 43 SstoreRefundGas uint64 = 15000 // Once per SSTORE operation if the zeroness changes to zero. 44 JumpdestGas uint64 = 1 // Refunded gas, once per SSTORE operation if the zeroness changes to zero. 45 IdentityGas uint64 = 15 // 46 EpochDuration uint64 = 30000 // Duration between proof-of-work epochs. 47 CallGas uint64 = 40 // Once per CALL operation & message call transaction. 48 CreateDataGas uint64 = 200 // 49 Ripemd160Gas uint64 = 600 // 50 Ripemd160WordGas uint64 = 120 // 51 CallCreateDepth uint64 = 1024 // Maximum depth of call/create stack. 52 ExpGas uint64 = 10 // Once per EXP instruction 53 LogGas uint64 = 375 // Per LOG* operation. 54 CopyGas uint64 = 3 // 55 StackLimit uint64 = 1024 // Maximum size of VM stack allowed. 56 TierStepGas uint64 = 0 // Once per operation, for a selection of them. 57 LogTopicGas uint64 = 375 // Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas. 58 CreateGas uint64 = 32000 // Once per CREATE operation & contract-creation transaction. 59 SuicideRefundGas uint64 = 24000 // Refunded following a suicide operation. 60 MemoryGas uint64 = 3 // Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL. 61 TxDataNonZeroGas uint64 = 68 // Per byte of data attached to a transaction that is not equal to zero. NOTE: Not payable on data of calls between transactions. 62 63 MaxCodeSize = 24576 64 ) 65 66 var ( 67 GasLimitBoundDivisor = big.NewInt(1024) // The bound divisor of the gas limit, used in update calculations. 68 MinGasLimit = big.NewInt(5000) // Minimum the gas limit may ever be. 69 GenesisGasLimit = big.NewInt(4712388) // Gas limit of the Genesis block. 70 TargetGasLimit = new(big.Int).Set(GenesisGasLimit) // The artificial target 71 DifficultyBoundDivisor = big.NewInt(2048) // The bound divisor of the difficulty, used in the update calculations. 72 GenesisDifficulty = big.NewInt(131072) // Difficulty of the Genesis block. 73 MinimumDifficulty = big.NewInt(131072) // The minimum that the difficulty may ever be. 74 DurationLimit = big.NewInt(13) // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not. 75 )