628 lines
26 KiB
Nim
628 lines
26 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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math, eth_common/eth_types,
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./utils/[macros_gen_opcodes, utils_numeric],
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./opcode_values, ./vm_forks
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# Gas Fee Schedule
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# Yellow Paper Appendix G - https://ethereum.github.io/yellowpaper/paper.pdf
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type
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GasFeeKind* = enum
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GasZero, # Nothing paid for operations of the set Wzero.
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GasBase, # Amount of gas to pay for operations of the set Wbase.
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GasVeryLow, # Amount of gas to pay for operations of the set Wverylow.
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GasLow, # Amount of gas to pay for operations of the set Wlow.
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GasMid, # Amount of gas to pay for operations of the set Wmid.
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GasHigh, # Amount of gas to pay for operations of the set Whigh.
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GasExtCode, # Amount of gas to pay for operations of the set Wextcode.
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GasBalance, # Amount of gas to pay for a BALANCE operation.
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GasSload, # Paid for a SLOAD operation.
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GasJumpDest, # Paid for a JUMPDEST operation.
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GasSset, # Paid for an SSTORE operation when the storage value is set to non-zero from zero.
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GasSreset, # Paid for an SSTORE operation when the storage value’s zeroness remains unchanged or is set to zero.
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RefundSclear, # Refund given (added into refund counter) when the storage value is set to zero from non-zero.
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RefundSelfDestruct, # Refund given (added into refund counter) for self-destructing an account.
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GasSelfDestruct, # Amount of gas to pay for a SELFDESTRUCT operation.
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GasCreate, # Paid for a CREATE operation.
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GasCodeDeposit, # Paid per byte for a CREATE operation to succeed in placing code into state.
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GasCall, # Paid for a CALL operation.
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GasCallValue, # Paid for a non-zero value transfer as part of the CALL operation.
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GasCallStipend, # A stipend for the called contract subtracted from Gcallvalue for a non-zero value transfer.
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GasNewAccount, # Paid for a CALL or SELFDESTRUCT operation which creates an account.
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GasExp, # Partial payment for an EXP operation.
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GasExpByte, # Partial payment when multiplied by ⌈log256(exponent)⌉ for the EXP operation.
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GasMemory, # Paid for every additional word when expanding memory.
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GasTXCreate, # Paid by all contract-creating transactions after the Homestead transition.
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GasTXDataZero, # Paid for every zero byte of data or code for a transaction.
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GasTXDataNonZero, # Paid for every non-zero byte of data or code for a transaction.
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GasTransaction, # Paid for every transaction.
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GasLog, # Partial payment for a LOG operation.
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GasLogData, # Paid for each byte in a LOG operation’s data.
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GasLogTopic, # Paid for each topic of a LOG operation.
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GasSha3, # Paid for each SHA3 operation.
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GasSha3Word, # Paid for each word (rounded up) for input data to a SHA3 operation.
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GasCopy, # Partial payment for COPY operations, multiplied by words copied, rounded up.
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GasBlockhash # Payment for BLOCKHASH operation.
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GasFeeSchedule = array[GasFeeKind, GasInt]
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GasParams* = object
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# Yellow Paper, Appendix H - https://ethereum.github.io/yellowpaper/paper.pdf
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# GasCost is a function of (σ, μ):
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# - σ is the full system state
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# - μ is the machine state
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# In practice, we often require the following from
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# - σ: an account address
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# - μ: a value popped from the stack or its size.
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case kind*: Op
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of Sstore:
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s_isStorageEmpty*: bool
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of Call:
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c_isNewAccount*: bool
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c_gasBalance*: GasInt
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c_contractGas*: Gasint
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c_currentMemSize*: Natural
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c_memOffset*: Natural
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c_memLength*: Natural
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else:
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discard
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GasCostKind* = enum
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GckInvalidOp,
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GckFixed,
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GckDynamic,
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GckMemExpansion,
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GckComplex
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GasResult = tuple[gasCost, gasRefund: GasInt]
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GasCost = object
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case kind*: GasCostKind
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of GckInvalidOp:
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discard
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of GckFixed:
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cost*: GasInt
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of GckDynamic:
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d_handler*: proc(value: Uint256): GasInt {.nimcall.}
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of GckMemExpansion:
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m_handler*: proc(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.}
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of GckComplex:
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c_handler*: proc(value: Uint256, gasParams: GasParams): GasResult {.nimcall.}
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# We use gasCost/gasRefund for:
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# - Properly log and order cost and refund (for Sstore especially)
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# - Allow to use unsigned integer in the future
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# - CALL instruction requires passing the child message gas (Ccallgas in yellow paper)
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GasCosts* = array[Op, GasCost]
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template gasCosts(fork: Fork, prefix, ResultGasCostsName: untyped) =
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## Generate the gas cost for each forks and store them in a const
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## named `ResultGasCostsName`
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const FeeSchedule = gasFees[fork]
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# ############### Helper functions ##############################
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func `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength: Natural): GasInt {.inline.} =
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# Input: size (in bytes)
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# Yellow Paper:
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# Memory expansion cost
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# = Cmem(μ′i) − Cmem(μi)
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# μi is memory size before opcode execution
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# μ'i is the memory size after opcode execution
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# Cmem(a) ≡ Gmemory · a + a² / 512
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#
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# Except when memLength = 0, where per eq (297),
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# M(currentMemSize, f, l) = currentMemSize
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let
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prev_words: int64 = currentMemSize.wordCount
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new_words: int64 = (memOffset + memLength).wordCount
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if memLength == 0 or new_words <= prev_words:
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# Special subcase of memory-expansion cost
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# currentMemSize - currentMemSize = 0
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# "Referencing a zero length range ... does not require memory to be extended
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# to the beginning of the range."
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#
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# Also, don't credit EVM code for allocating memory
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# then accessing lots of low memory. memoryGasCost,
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# via go-ethereum, checks for this as special case.
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return 0
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let
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prev_cost = prev_words * static(FeeSchedule[GasMemory]) +
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(prev_words ^ 2) shr 9 # div 512
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new_cost = new_words * static(FeeSchedule[GasMemory]) +
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(new_words ^ 2) shr 9 # div 512
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# TODO: add logging
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result = max(new_cost - prev_cost, 0)
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func `prefix all_but_one_64th`(gas: GasInt): GasInt {.inline.} =
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## Computes all but 1/64th
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## L(n) ≡ n − ⌊n/64⌋ - (floored(n/64))
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# Introduced in EIP-150 - https://github.com/ethereum/EIPs/blob/master/EIPS/eip-150.md
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# Note: The all-but-one-64th calculation should occur after the memory expansion fee is taken
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# https://github.com/ethereum/yellowpaper/pull/442
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result = gas - (gas shr 6)
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# ############### Opcode gas functions ##############################
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func `prefix gasExp`(value: Uint256): GasInt {.nimcall.} =
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## Value is the exponent
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result = static FeeSchedule[GasExp]
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if not value.isZero:
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result += static(FeeSchedule[GasExpByte]) * (1 + log256(value))
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func `prefix gasCreate`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result =
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static(FeeSchedule[GasCreate]) +
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static(FeeSchedule[GasCodeDeposit]) * memLength
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func `prefix gasSha3`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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result += static(FeeSchedule[GasSha3]) +
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static(FeeSchedule[GasSha3Word]) * (memLength).wordCount
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func `prefix gasCopy`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = static(FeeSchedule[GasVeryLow]) +
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static(FeeSchedule[GasCopy]) * memLength.wordCount
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result += `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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func `prefix gasExtCodeCopy`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = static(FeeSchedule[GasExtCode]) +
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static(FeeSchedule[GasCopy]) * memLength.wordCount
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result += `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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func `prefix gasLoadStore`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = static(FeeSchedule[GasVeryLow])
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result += `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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func `prefix gasSstore`(value: Uint256, gasParams: Gasparams): GasResult {.nimcall.} =
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## Value is word to save
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# workaround for static evaluation not working for if expression
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const
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gSet = FeeSchedule[GasSset]
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gSreset = FeeSchedule[GasSreset]
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# Gas cost - literal translation of Yellow Paper
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result.gasCost = if value.isZero.not and gasParams.s_isStorageEmpty:
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gSet
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else:
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gSreset
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# Refund
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if value.isZero and not gasParams.s_isStorageEmpty:
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result.gasRefund = static(FeeSchedule[RefundSclear])
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func `prefix gasLog0`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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result += static(FeeSchedule[GasLog]) +
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static(FeeSchedule[GasLogData]) * memLength
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func `prefix gasLog1`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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result += static(FeeSchedule[GasLog]) +
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static(FeeSchedule[GasLogData]) * memLength +
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static(FeeSchedule[GasLogTopic])
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func `prefix gasLog2`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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result += static(FeeSchedule[GasLog]) +
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static(FeeSchedule[GasLogData]) * memLength +
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static(2 * FeeSchedule[GasLogTopic])
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func `prefix gasLog3`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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result += static(FeeSchedule[GasLog]) +
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static(FeeSchedule[GasLogData]) * memLength +
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static(3 * FeeSchedule[GasLogTopic])
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func `prefix gasLog4`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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result = `prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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result += static(FeeSchedule[GasLog]) +
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static(FeeSchedule[GasLogData]) * memLength +
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static(4 * FeeSchedule[GasLogTopic])
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func `prefix gasCall`(value: Uint256, gasParams: Gasparams): GasResult {.nimcall.} =
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# From the Yellow Paper, going through the equation from bottom to top
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# https://ethereum.github.io/yellowpaper/paper.pdf#appendix.H
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#
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# More readable info on the subtleties wiki page: https://github.com/ethereum/wiki/wiki/Subtleties#other-operations
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# CALL has a multi-part gas cost:
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#
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# - 700 base
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# - 9000 additional if the value is nonzero
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# - 25000 additional if the destination account does not yet exist
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#
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# The child message of a nonzero-value CALL operation (NOT the top-level message arising from a transaction!)
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# gains an additional 2300 gas on top of the gas supplied by the calling account;
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# this stipend can be considered to be paid out of the 9000 mandatory additional fee for nonzero-value calls.
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# This ensures that a call recipient will always have enough gas to log that it received funds.
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#
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# EIP150 goes over computation: https://github.com/ethereum/eips/issues/150
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#
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# The discussion for the draft EIP-5, which proposes to change the CALL opcode also goes over
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# the current implementation - https://github.com/ethereum/EIPs/issues/8
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# First we have to take into account the costs of memory expansion:
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# Note there is a "bug" in the Ethereum Yellow Paper
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# - https://github.com/ethereum/yellowpaper/issues/325
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# μg already includes memory expansion costs but it is not
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# plainly explained n the CALL opcode details
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# i.e. Cmem(μ′i) − Cmem(μi)
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# Yellow Paper: μ′i ≡ M(M(μi,μs[3],μs[4]),μs[5],μs[6])
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# M is the memory expansion function
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# μ′i is passed through gasParams.memRequested
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# TODO:
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# - Py-EVM has costs for both input and output memory expansion
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# https://github.com/ethereum/py-evm/blob/eed0bfe4499b394ee58113408e487e7d35ab88d6/evm/vm/logic/call.py#L56-L57
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# - Parity only for the largest expansion
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# https://github.com/paritytech/parity/blob/af1088ef61323f171915555023d8e993aaaed755/ethcore/evm/src/interpreter/gasometer.rs#L192-L195
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# - Go-Ethereum only has one cost
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# https://github.com/ethereum/go-ethereum/blob/13af27641829f61d1e6b383e37aab6caae22f2c1/core/vm/gas_table.go#L334
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# ⚠⚠ Py-EVM seems wrong if memory is needed for both in and out.
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result.gasCost = `prefix gasMemoryExpansion`(
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gasParams.c_currentMemSize,
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gasParams.c_memOffset,
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gasParams.c_memLength
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)
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# Cnew_account
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if gasParams.c_isNewAccount:
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if fork < FkSpurious:
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# Pre-EIP161 all account creation calls consumed 25000 gas.
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result.gasCost += static(FeeSchedule[GasNewAccount])
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else:
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# Afterwards, only those transfering value:
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# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-158.md
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# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-161.md
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if not value.isZero:
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result.gasCost += static(FeeSchedule[GasNewAccount])
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# Cxfer
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if not value.isZero:
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result.gasCost += static(FeeSchedule[GasCallValue])
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# Cextra
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result.gasCost += static(FeeSchedule[GasCall])
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let cextra = result.gasCost
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# Cgascap
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if fork >= FkTangerine:
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# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-150.md
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result.gasCost =
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if gasParams.c_gasBalance >= result.gasCost:
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min(
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`prefix all_but_one_64th`(gasParams.c_gasBalance - result.gasCost),
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gasParams.c_contract_gas
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)
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else:
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gasParams.c_contract_gas
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# Ccallgas - Gas sent to the child message
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result.gasRefund = result.gasCost
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if not value.isZero:
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result.gasRefund += static(FeeSchedule[GasCallStipend])
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# Ccall
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result.gasCost += cextra
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func `prefix gasHalt`(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.} =
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`prefix gasMemoryExpansion`(currentMemSize, memOffset, memLength)
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func `prefix gasSelfDestruct`(value: Uint256, gasParams: Gasparams): GasResult {.nimcall.} =
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# TODO
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discard
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# ###################################################################################################
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# TODO - change this `let` into `const` - pending: https://github.com/nim-lang/Nim/issues/8015
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let `ResultGasCostsName`*{.inject.}: GasCosts = block:
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# We use a block expression to avoid name redefinition conflicts
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# with "fixed" and "dynamic"
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# Syntactic sugar
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func fixed(gasFeeKind: static[GasFeeKind]): GasCost =
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GasCost(kind: GckFixed, cost: static(FeeSchedule[gasFeeKind]))
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func dynamic(handler: proc(value: Uint256): GasInt {.nimcall.}): GasCost =
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GasCost(kind: GckDynamic, d_handler: handler)
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func memExpansion(handler: proc(currentMemSize, memOffset, memLength: Natural): GasInt {.nimcall.}): GasCost =
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GasCost(kind: GckMemExpansion, m_handler: handler)
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func complex(handler: proc(value: Uint256, gasParams: GasParams): GasResult {.nimcall.}): GasCost =
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GasCost(kind: GckComplex, c_handler: handler)
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# Returned value
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fill_enum_table_holes(Op, GasCost(kind: GckInvalidOp)):
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[
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# 0s: Stop and Arithmetic Operations
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Stop: fixed GasZero,
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Add: fixed GasVeryLow,
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Mul: fixed GasLow,
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Sub: fixed GasVeryLow,
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Div: fixed GasLow,
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Sdiv: fixed GasLow,
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Mod: fixed GasLow,
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Smod: fixed GasLow,
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Addmod: fixed GasMid,
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Mulmod: fixed GasMid,
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Exp: dynamic `prefix gasExp`,
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SignExtend: fixed GasLow,
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# 10s: Comparison & Bitwise Logic Operations
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Lt: fixed GasVeryLow,
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Gt: fixed GasVeryLow,
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Slt: fixed GasVeryLow,
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Sgt: fixed GasVeryLow,
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Eq: fixed GasVeryLow,
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IsZero: fixed GasVeryLow,
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And: fixed GasVeryLow,
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Or: fixed GasVeryLow,
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Xor: fixed GasVeryLow,
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Not: fixed GasVeryLow,
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Byte: fixed GasVeryLow,
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# 20s: SHA3
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Sha3: memExpansion `prefix gasSha3`,
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# 30s: Environmental Information
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Address: fixed GasBase,
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Balance: fixed GasBalance,
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Origin: fixed GasBase,
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Caller: fixed GasBase,
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CallValue: fixed GasBase,
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CallDataLoad: fixed GasVeryLow,
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CallDataSize: fixed GasBase,
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CallDataCopy: memExpansion `prefix gasCopy`,
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CodeSize: fixed GasBase,
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CodeCopy: memExpansion `prefix gasCopy`,
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GasPrice: fixed GasBase,
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ExtCodeSize: fixed GasExtcode,
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ExtCodeCopy: memExpansion `prefix gasExtCodeCopy`,
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ReturnDataSize: fixed GasBase,
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ReturnDataCopy: memExpansion `prefix gasCopy`,
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# 40s: Block Information
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Blockhash: fixed GasBlockhash,
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Coinbase: fixed GasBase,
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Timestamp: fixed GasBase,
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Number: fixed GasBase,
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Difficulty: fixed GasBase,
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GasLimit: fixed GasBase,
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# 50s: Stack, Memory, Storage and Flow Operations
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Pop: fixed GasBase,
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Mload: memExpansion `prefix gasLoadStore`,
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Mstore: memExpansion `prefix gasLoadStore`,
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Mstore8: memExpansion `prefix gasLoadStore`,
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Sload: fixed GasSload,
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Sstore: complex `prefix gasSstore`,
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Jump: fixed GasMid,
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JumpI: fixed GasHigh,
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Pc: fixed GasBase,
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Msize: fixed GasBase,
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Gas: fixed GasBase,
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JumpDest: fixed GasJumpDest,
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# 60s & 70s: Push Operations
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Push1: fixed GasVeryLow,
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Push2: fixed GasVeryLow,
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Push3: fixed GasVeryLow,
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Push4: fixed GasVeryLow,
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Push5: fixed GasVeryLow,
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Push6: fixed GasVeryLow,
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Push7: fixed GasVeryLow,
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Push8: fixed GasVeryLow,
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Push9: fixed GasVeryLow,
|
||
Push10: fixed GasVeryLow,
|
||
Push11: fixed GasVeryLow,
|
||
Push12: fixed GasVeryLow,
|
||
Push13: fixed GasVeryLow,
|
||
Push14: fixed GasVeryLow,
|
||
Push15: fixed GasVeryLow,
|
||
Push16: fixed GasVeryLow,
|
||
Push17: fixed GasVeryLow,
|
||
Push18: fixed GasVeryLow,
|
||
Push19: fixed GasVeryLow,
|
||
Push20: fixed GasVeryLow,
|
||
Push21: fixed GasVeryLow,
|
||
Push22: fixed GasVeryLow,
|
||
Push23: fixed GasVeryLow,
|
||
Push24: fixed GasVeryLow,
|
||
Push25: fixed GasVeryLow,
|
||
Push26: fixed GasVeryLow,
|
||
Push27: fixed GasVeryLow,
|
||
Push28: fixed GasVeryLow,
|
||
Push29: fixed GasVeryLow,
|
||
Push30: fixed GasVeryLow,
|
||
Push31: fixed GasVeryLow,
|
||
Push32: fixed GasVeryLow,
|
||
|
||
# 80s: Duplication Operations
|
||
Dup1: fixed GasVeryLow,
|
||
Dup2: fixed GasVeryLow,
|
||
Dup3: fixed GasVeryLow,
|
||
Dup4: fixed GasVeryLow,
|
||
Dup5: fixed GasVeryLow,
|
||
Dup6: fixed GasVeryLow,
|
||
Dup7: fixed GasVeryLow,
|
||
Dup8: fixed GasVeryLow,
|
||
Dup9: fixed GasVeryLow,
|
||
Dup10: fixed GasVeryLow,
|
||
Dup11: fixed GasVeryLow,
|
||
Dup12: fixed GasVeryLow,
|
||
Dup13: fixed GasVeryLow,
|
||
Dup14: fixed GasVeryLow,
|
||
Dup15: fixed GasVeryLow,
|
||
Dup16: fixed GasVeryLow,
|
||
|
||
# 90s: Exchange Operations
|
||
Swap1: fixed GasVeryLow,
|
||
Swap2: fixed GasVeryLow,
|
||
Swap3: fixed GasVeryLow,
|
||
Swap4: fixed GasVeryLow,
|
||
Swap5: fixed GasVeryLow,
|
||
Swap6: fixed GasVeryLow,
|
||
Swap7: fixed GasVeryLow,
|
||
Swap8: fixed GasVeryLow,
|
||
Swap9: fixed GasVeryLow,
|
||
Swap10: fixed GasVeryLow,
|
||
Swap11: fixed GasVeryLow,
|
||
Swap12: fixed GasVeryLow,
|
||
Swap13: fixed GasVeryLow,
|
||
Swap14: fixed GasVeryLow,
|
||
Swap15: fixed GasVeryLow,
|
||
Swap16: fixed GasVeryLow,
|
||
|
||
# a0s: Logging Operations
|
||
Log0: memExpansion `prefix gasLog0`,
|
||
Log1: memExpansion `prefix gasLog1`,
|
||
Log2: memExpansion `prefix gasLog2`,
|
||
Log3: memExpansion `prefix gasLog3`,
|
||
Log4: memExpansion `prefix gasLog4`,
|
||
|
||
# f0s: System operations
|
||
Create: memExpansion `prefix gasCreate`, # TODO: Change to dynamic?
|
||
Call: complex `prefix gasCall`,
|
||
CallCode: complex `prefix gasCall`,
|
||
Return: memExpansion `prefix gasHalt`,
|
||
DelegateCall: complex `prefix gasCall`,
|
||
StaticCall: complex `prefix gasCall`,
|
||
Op.Revert: memExpansion `prefix gasHalt`,
|
||
Invalid: fixed GasZero,
|
||
SelfDestruct: complex `prefix gasSelfDestruct`
|
||
]
|
||
|
||
# Generate the fork-specific gas costs tables
|
||
const
|
||
BaseGasFees: GasFeeSchedule = [
|
||
# Fee Schedule for the initial Ethereum forks
|
||
GasZero: 0'i64,
|
||
GasBase: 2,
|
||
GasVeryLow: 3,
|
||
GasLow: 5,
|
||
GasMid: 8,
|
||
GasHigh: 10,
|
||
GasExtCode: 20, # Changed to 700 in Tangerine (EIP150)
|
||
GasBalance: 20, # Changed to 400 in Tangerine (EIP150)
|
||
GasSload: 50, # Changed to 200 in Tangerine (EIP150)
|
||
GasJumpDest: 1,
|
||
GasSset: 20_000,
|
||
GasSreset: 5_000,
|
||
RefundSclear: 15_000,
|
||
RefundSelfDestruct: 24_000,
|
||
GasSelfDestruct: 0, # Changed to 5000 in Tangerine (EIP150)
|
||
GasCreate: 32000,
|
||
GasCodeDeposit: 200,
|
||
GasCall: 40, # Changed to 700 in Tangerine (EIP150)
|
||
GasCallValue: 9000,
|
||
GasCallStipend: 2300,
|
||
GasNewAccount: 25_000,
|
||
GasExp: 10,
|
||
GasExpByte: 10, # Changed to 50 in Spurious Dragon (EIP160)
|
||
GasMemory: 3,
|
||
GasTXCreate: 0, # Changed to 32000 in Homestead (EIP2)
|
||
GasTXDataZero: 4,
|
||
GasTXDataNonZero: 68,
|
||
GasTransaction: 21000,
|
||
GasLog: 375,
|
||
GasLogData: 8,
|
||
GasLogTopic: 375,
|
||
GasSha3: 30,
|
||
GasSha3Word: 6,
|
||
GasCopy: 3,
|
||
GasBlockhash: 20
|
||
]
|
||
|
||
# Create the schedule for each forks
|
||
func homesteadGasFees(previous_fees: GasFeeSchedule): GasFeeSchedule =
|
||
# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-2.md
|
||
result = previous_fees
|
||
result[GasTXCreate] = 32000
|
||
|
||
func tangerineGasFees(previous_fees: GasFeeSchedule): GasFeeSchedule =
|
||
# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-150.md
|
||
result = previous_fees
|
||
result[GasSload] = 200
|
||
result[GasSelfDestruct] = 5000
|
||
result[GasBalance] = 400
|
||
result[GasCall] = 40
|
||
|
||
func spuriousGasFees(previous_fees: GasFeeSchedule): GasFeeSchedule =
|
||
# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-160.md
|
||
result = previous_fees
|
||
result[GasExpByte] = 50
|
||
|
||
const
|
||
HomesteadGasFees = BaseGasFees.homesteadGasFees
|
||
TangerineGasFees = HomesteadGasFees.tangerineGasFees
|
||
SpuriousGasFees = TangerineGasFees.spuriousGasFees
|
||
|
||
gasFees*: array[Fork, GasFeeSchedule] = [
|
||
FkFrontier: BaseGasFees,
|
||
FkThawing: BaseGasFees,
|
||
FkHomestead: HomesteadGasFees,
|
||
FkDao: HomesteadGasFees,
|
||
FkTangerine: TangerineGasFees,
|
||
FkSpurious: SpuriousGasFees,
|
||
FkByzantium: SpuriousGasFees, # not supported yet
|
||
]
|
||
|
||
|
||
gasCosts(FkFrontier, base, BaseGasCosts)
|
||
gasCosts(FkHomestead, homestead, HomesteadGasCosts)
|
||
gasCosts(FkTangerine, tangerine, TangerineGasCosts)
|
||
|
||
proc forkToSchedule*(fork: Fork): GasCosts =
|
||
if fork < FkHomestead:
|
||
BaseGasCosts
|
||
elif fork < FkTangerine:
|
||
HomesteadGasCosts
|
||
else:
|
||
TangerineGasCosts
|
||
|
||
const
|
||
## Precompile costs
|
||
GasSHA256* = 60
|
||
GasSHA256Word* = 12
|
||
GasRIPEMD160* = 600
|
||
GasRIPEMD160Word* = 120
|
||
GasIdentity* = 15
|
||
GasIdentityWord* = 3
|
||
GasECRecover* = 3000
|
||
GasECAdd* = 500
|
||
GasECMul* = 40000
|
||
GasECPairingBase* = 100000
|
||
GasECPairingPerPoint* = 80000
|
||
# The Yellow Paper is special casing the GasQuadDivisor.
|
||
# It is defined in Appendix G with the other GasFeeKind constants
|
||
# instead of Appendix E for precompiled contracts
|
||
GasQuadDivisor* = 100
|