params

Documentation

Index

• Constants
• Variables
• type EVMParam
• type GasParam

Constants

const (
	CallValueTransferGas uint64 = 9000  // Paid for CALL when the value transfer is non-zero.
	CallNewAccountGas    uint64 = 25000 // Paid for CALL when the destination address didn't exist prior.
	TxGas                uint64 = 21000 // Per transaction not creating a contract. NOTE: Not payable on data of calls between transactions.

	QuadCoeffDiv uint64 = 512  // Divisor for the quadratic particle of the memory cost equation.
	LogDataGas   uint64 = 8    // Per byte in a LOG* operation's data.
	CallStipend  uint64 = 2300 // Free gas given at beginning of call.

	Sha3Gas     uint64 = 30 // Once per SHA3 operation.
	Sha3WordGas uint64 = 6  // Once per word of the SHA3 operation's data.

	SstoreSetGas    uint64 = 20000 // Once per SLOAD operation.
	SstoreResetGas  uint64 = 5000  // Once per SSTORE operation if the zeroness changes from zero.
	SstoreClearGas  uint64 = 5000  // Once per SSTORE operation if the zeroness doesn't change.
	SstoreRefundGas uint64 = 15000 // Once per SSTORE operation if the zeroness changes to zero.

	JumpdestGas uint64 = 1 // Once per JUMPDEST operation.

	CreateDataGas   uint64 = 200  //
	CallCreateDepth uint64 = 1024 // Maximum depth of call/create stack.

	LogGas     uint64 = 375  // Per LOG* operation.
	CopyGas    uint64 = 3    //
	StackLimit uint64 = 1024 // Maximum size of VM stack allowed.
	//TierStepGas              uint64 = 0     // Once per operation, for a selection of them.
	LogTopicGas uint64 = 375   // Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas.
	CreateGas   uint64 = 32000 // Once per CREATE operation & contract-creation transaction.
	//Create2Gas               uint64 = 32000 // Once per CREATE2 operation
	SelfdestructRefundGas uint64 = 24000 // Refunded following a selfdestruct operation.
	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.
	//TxDataNonZeroGasFrontier 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.
	//TxDataNonZeroGasEIP2028  uint64 = 16    // Per byte of non zero data attached to a transaction after EIP 2028 (part in Istanbul)
	//
	//// These have been changed during the course of the chain
	//CallGasFrontier              uint64 = 40  // Once per CALL operation & message call transaction.
	//CallGasEIP150                uint64 = 700 // Static portion of gas for CALL-derivates after EIP 150 (Tangerine)
	//BalanceGasFrontier           uint64 = 20  // The cost of a BALANCE operation
	//BalanceGasEIP150             uint64 = 400 // The cost of a BALANCE operation after Tangerine
	//BalanceGasEIP1884            uint64 = 700 // The cost of a BALANCE operation after EIP 1884 (part of Istanbul)
	//ExtcodeSizeGasFrontier       uint64 = 20  // Cost of EXTCODESIZE before EIP 150 (Tangerine)
	//ExtcodeSizeGasEIP150         uint64 = 700 // Cost of EXTCODESIZE after EIP 150 (Tangerine)
	//SloadGasFrontier             uint64 = 50
	//SloadGasEIP150               uint64 = 200
	//SloadGasEIP1884              uint64 = 800  // Cost of SLOAD after EIP 1884 (part of Istanbul)
	//SloadGasEIP2200              uint64 = 800  // Cost of SLOAD after EIP 2200 (part of Istanbul)
	ExtcodeHashGasConstantinople uint64 = 400 // Cost of EXTCODEHASH (introduced in Constantinople)

	MaxCodeSize = 24576 // Maximum bytecode to permit for a contract

	EcrecoverGas        uint64 = 3000 // Elliptic curve sender recovery gas price
	Sha256BaseGas       uint64 = 60   // Base price for a SHA256 operation
	Sha256PerWordGas    uint64 = 12   // Per-word price for a SHA256 operation
	Ripemd160BaseGas    uint64 = 600  // Base price for a RIPEMD160 operation
	Ripemd160PerWordGas uint64 = 120  // Per-word price for a RIPEMD160 operation
	IdentityBaseGas     uint64 = 15   // Base price for a data copy operation
	IdentityPerWordGas  uint64 = 3    // Per-work price for a data copy operation
	ModExpQuadCoeffDiv  uint64 = 20   // Divisor for the quadratic particle of the big int modular exponentiation

	Bn256AddGasByzantium             uint64 = 500    // Byzantium gas needed for an elliptic curve addition
	Bn256AddGasIstanbul              uint64 = 150    // Gas needed for an elliptic curve addition
	Bn256ScalarMulGasByzantium       uint64 = 40000  // Byzantium gas needed for an elliptic curve scalar multiplication
	Bn256ScalarMulGasIstanbul        uint64 = 6000   // Gas needed for an elliptic curve scalar multiplication
	Bn256PairingBaseGasByzantium     uint64 = 100000 // Byzantium base price for an elliptic curve pairing check
	Bn256PairingBaseGasIstanbul      uint64 = 45000  // Base price for an elliptic curve pairing check
	Bn256PairingPerPointGasByzantium uint64 = 80000  // Byzantium per-point price for an elliptic curve pairing check
	Bn256PairingPerPointGasIstanbul  uint64 = 34000  // Per-point price for an elliptic curve pairing check

	Bls12381G1AddGas          uint64 = 600    // Price for BLS12-381 elliptic curve G1 point addition
	Bls12381G1MulGas          uint64 = 12000  // Price for BLS12-381 elliptic curve G1 point scalar multiplication
	Bls12381G2AddGas          uint64 = 4500   // Price for BLS12-381 elliptic curve G2 point addition
	Bls12381G2MulGas          uint64 = 55000  // Price for BLS12-381 elliptic curve G2 point scalar multiplication
	Bls12381PairingBaseGas    uint64 = 115000 // Base gas price for BLS12-381 elliptic curve pairing check
	Bls12381PairingPerPairGas uint64 = 23000  // Per-point pair gas price for BLS12-381 elliptic curve pairing check
	Bls12381MapG1Gas          uint64 = 5500   // Gas price for BLS12-381 mapping field element to G1 operation
	Bls12381MapG2Gas          uint64 = 110000 // Gas price for BLS12-381 mapping field element to G2 operation
)

Variables

var (
	//  DifficultyBoundDivisor The bound divisor of the difficulty, used in the update calculations.
	DifficultyBoundDivisor = big.NewInt(2048)
	// GenesisDifficulty Difficulty of the Genesis block.
	GenesisDifficulty = big.NewInt(131072)
	// MinimumDifficulty The minimum that the difficulty may ever be.
	MinimumDifficulty = big.NewInt(131072)
	// DurationLimit The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
	DurationLimit = big.NewInt(13)
)

var Bls12381MultiExpDiscountTable = [128]uint64{} /* 128 elements not displayed */

Bls12381MultiExpDiscountTable Gas discount table for BLS12-381 G1 and G2 multi exponentiation operations

Types

type EVMParam

type EVMParam struct {

	// EVMStateDB 状态数据操作入口
	StateDB state.EVMStateDB

	// CallGasTemp 此属性用于临时存储计算出来的Gas消耗值
	// 在指令执行时，会调用指令的gasCost方法，计算出此指令需要消耗的Gas，并存放在此临时属性中
	// 然后在执行opCall时，从此属性获取消耗的Gas值
	CallGasTemp uint64

	// BlockNumber NUMBER 指令，当前区块高度
	BlockNumber *big.Int
}

EVMParam 解释器中调用Gas计算时所传递的合约中和EVM相关的参数结构 之所以单独封装，是为了将解释器、Gas计算两者解耦 此结构包含的属性中StateDB和CallGasTemp可写，解释器调用Gas计算的步骤如下： 1. 使用EVM构造EVMParam（属性除CallGasTemp外，全部传递引用）； 2. 以EVMParam为参数，调用Gas计算； 3. 计算结束后，使用EVMParam中的值回填到EVM中；

type GasParam

type GasParam struct {
	// Gas 此合约对象的可用Gas（合约执行过程中会修改此值）
	Gas uint64

	// Address 上下文中合约自身的地址
	// 注意，当合约通过CallCode调用时，这个地址并不是当前合约代码对应的地址，而是调用者的地址
	Address common.Address
}

GasParam 解释器中调用Gas计算时所传递的合约中和Gas相关的参数结构 之所以单独封装，是为了将解释器、指令集、Gas计算三者解耦 此结构包含的属性均为只读