c12f4df910
Reworked the EVM gas instructions to use 64bit integers rather than arbitrary size big ints. All gas operations, be it additions, multiplications or divisions, are checked and guarded against 64 bit integer overflows. In additon, most of the protocol paramaters in the params package have been converted to uint64 and are now constants rather than variables. * common/math: added overflow check ops * core: vmenv, env renamed to evm * eth, internal/ethapi, les: unmetered eth_call and cancel methods * core/vm: implemented big.Int pool for evm instructions * core/vm: unexported intPool methods & verification methods * core/vm: added memoryGasCost overflow check and test
76 lines
5.0 KiB
Go
76 lines
5.0 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 params
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import "math/big"
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const (
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MaximumExtraDataSize uint64 = 32 // Maximum size extra data may be after Genesis.
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ExpByteGas uint64 = 10 // Times ceil(log256(exponent)) for the EXP instruction.
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SloadGas uint64 = 50 // Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added.
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CallValueTransferGas uint64 = 9000 // Paid for CALL when the value transfer is non-zero.
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CallNewAccountGas uint64 = 25000 // Paid for CALL when the destination address didn't exist prior.
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TxGas uint64 = 21000 // Per transaction not creating a contract. NOTE: Not payable on data of calls between transactions.
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TxGasContractCreation uint64 = 53000 // Per transaction that creates a contract. NOTE: Not payable on data of calls between transactions.
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TxDataZeroGas uint64 = 4 // Per byte of data attached to a transaction that equals zero. NOTE: Not payable on data of calls between transactions.
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QuadCoeffDiv uint64 = 512 // Divisor for the quadratic particle of the memory cost equation.
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SstoreSetGas uint64 = 20000 // Once per SLOAD operation.
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LogDataGas uint64 = 8 // Per byte in a LOG* operation's data.
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CallStipend uint64 = 2300 // Free gas given at beginning of call.
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EcrecoverGas uint64 = 3000 //
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Sha256WordGas uint64 = 12 //
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Sha3Gas uint64 = 30 // Once per SHA3 operation.
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Sha256Gas uint64 = 60 //
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IdentityWordGas uint64 = 3 //
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Sha3WordGas uint64 = 6 // Once per word of the SHA3 operation's data.
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SstoreResetGas uint64 = 5000 // Once per SSTORE operation if the zeroness changes from zero.
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SstoreClearGas uint64 = 5000 // Once per SSTORE operation if the zeroness doesn't change.
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SstoreRefundGas uint64 = 15000 // Once per SSTORE operation if the zeroness changes to zero.
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JumpdestGas uint64 = 1 // Refunded gas, once per SSTORE operation if the zeroness changes to zero.
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IdentityGas uint64 = 15 //
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EpochDuration uint64 = 30000 // Duration between proof-of-work epochs.
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CallGas uint64 = 40 // Once per CALL operation & message call transaction.
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CreateDataGas uint64 = 200 //
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Ripemd160Gas uint64 = 600 //
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Ripemd160WordGas uint64 = 120 //
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CallCreateDepth uint64 = 1024 // Maximum depth of call/create stack.
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ExpGas uint64 = 10 // Once per EXP instruction
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LogGas uint64 = 375 // Per LOG* operation.
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CopyGas uint64 = 3 //
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StackLimit uint64 = 1024 // Maximum size of VM stack allowed.
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TierStepGas uint64 = 0 // Once per operation, for a selection of them.
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LogTopicGas uint64 = 375 // Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas.
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CreateGas uint64 = 32000 // Once per CREATE operation & contract-creation transaction.
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SuicideRefundGas uint64 = 24000 // Refunded following a suicide operation.
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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.
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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.
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MaxCodeSize = 24576
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)
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var (
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GasLimitBoundDivisor = big.NewInt(1024) // The bound divisor of the gas limit, used in update calculations.
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MinGasLimit = big.NewInt(5000) // Minimum the gas limit may ever be.
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GenesisGasLimit = big.NewInt(4712388) // Gas limit of the Genesis block.
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TargetGasLimit = new(big.Int).Set(GenesisGasLimit) // The artificial target
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DifficultyBoundDivisor = big.NewInt(2048) // The bound divisor of the difficulty, used in the update calculations.
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GenesisDifficulty = big.NewInt(131072) // Difficulty of the Genesis block.
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MinimumDifficulty = big.NewInt(131072) // The minimum that the difficulty may ever be.
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DurationLimit = big.NewInt(13) // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
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)
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