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  )