245 lines
11 KiB
Go
245 lines
11 KiB
Go
// Copyright 2020 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package vm
|
|
|
|
import (
|
|
"errors"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/common/math"
|
|
"github.com/ethereum/go-ethereum/params"
|
|
)
|
|
|
|
func makeGasSStoreFunc(clearingRefund uint64) gasFunc {
|
|
return func(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
|
|
// If we fail the minimum gas availability invariant, fail (0)
|
|
if contract.Gas <= params.SstoreSentryGasEIP2200 {
|
|
return 0, errors.New("not enough gas for reentrancy sentry")
|
|
}
|
|
// Gas sentry honoured, do the actual gas calculation based on the stored value
|
|
var (
|
|
y, x = stack.Back(1), stack.peek()
|
|
slot = common.Hash(x.Bytes32())
|
|
current = evm.StateDB.GetState(contract.Address(), slot)
|
|
cost = uint64(0)
|
|
)
|
|
// Check slot presence in the access list
|
|
if addrPresent, slotPresent := evm.StateDB.SlotInAccessList(contract.Address(), slot); !slotPresent {
|
|
cost = params.ColdSloadCostEIP2929
|
|
// If the caller cannot afford the cost, this change will be rolled back
|
|
evm.StateDB.AddSlotToAccessList(contract.Address(), slot)
|
|
if !addrPresent {
|
|
// Once we're done with YOLOv2 and schedule this for mainnet, might
|
|
// be good to remove this panic here, which is just really a
|
|
// canary to have during testing
|
|
panic("impossible case: address was not present in access list during sstore op")
|
|
}
|
|
}
|
|
value := common.Hash(y.Bytes32())
|
|
|
|
if current == value { // noop (1)
|
|
// EIP 2200 original clause:
|
|
// return params.SloadGasEIP2200, nil
|
|
return cost + params.WarmStorageReadCostEIP2929, nil // SLOAD_GAS
|
|
}
|
|
original := evm.StateDB.GetCommittedState(contract.Address(), x.Bytes32())
|
|
if original == current {
|
|
if original == (common.Hash{}) { // create slot (2.1.1)
|
|
return cost + params.SstoreSetGasEIP2200, nil
|
|
}
|
|
if value == (common.Hash{}) { // delete slot (2.1.2b)
|
|
evm.StateDB.AddRefund(clearingRefund)
|
|
}
|
|
// EIP-2200 original clause:
|
|
// return params.SstoreResetGasEIP2200, nil // write existing slot (2.1.2)
|
|
return cost + (params.SstoreResetGasEIP2200 - params.ColdSloadCostEIP2929), nil // write existing slot (2.1.2)
|
|
}
|
|
if original != (common.Hash{}) {
|
|
if current == (common.Hash{}) { // recreate slot (2.2.1.1)
|
|
evm.StateDB.SubRefund(clearingRefund)
|
|
} else if value == (common.Hash{}) { // delete slot (2.2.1.2)
|
|
evm.StateDB.AddRefund(clearingRefund)
|
|
}
|
|
}
|
|
if original == value {
|
|
if original == (common.Hash{}) { // reset to original inexistent slot (2.2.2.1)
|
|
// EIP 2200 Original clause:
|
|
//evm.StateDB.AddRefund(params.SstoreSetGasEIP2200 - params.SloadGasEIP2200)
|
|
evm.StateDB.AddRefund(params.SstoreSetGasEIP2200 - params.WarmStorageReadCostEIP2929)
|
|
} else { // reset to original existing slot (2.2.2.2)
|
|
// EIP 2200 Original clause:
|
|
// evm.StateDB.AddRefund(params.SstoreResetGasEIP2200 - params.SloadGasEIP2200)
|
|
// - SSTORE_RESET_GAS redefined as (5000 - COLD_SLOAD_COST)
|
|
// - SLOAD_GAS redefined as WARM_STORAGE_READ_COST
|
|
// Final: (5000 - COLD_SLOAD_COST) - WARM_STORAGE_READ_COST
|
|
evm.StateDB.AddRefund((params.SstoreResetGasEIP2200 - params.ColdSloadCostEIP2929) - params.WarmStorageReadCostEIP2929)
|
|
}
|
|
}
|
|
// EIP-2200 original clause:
|
|
//return params.SloadGasEIP2200, nil // dirty update (2.2)
|
|
return cost + params.WarmStorageReadCostEIP2929, nil // dirty update (2.2)
|
|
}
|
|
}
|
|
|
|
// gasSLoadEIP2929 calculates dynamic gas for SLOAD according to EIP-2929
|
|
// For SLOAD, if the (address, storage_key) pair (where address is the address of the contract
|
|
// whose storage is being read) is not yet in accessed_storage_keys,
|
|
// charge 2100 gas and add the pair to accessed_storage_keys.
|
|
// If the pair is already in accessed_storage_keys, charge 100 gas.
|
|
func gasSLoadEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
|
|
loc := stack.peek()
|
|
slot := common.Hash(loc.Bytes32())
|
|
// Check slot presence in the access list
|
|
if _, slotPresent := evm.StateDB.SlotInAccessList(contract.Address(), slot); !slotPresent {
|
|
// If the caller cannot afford the cost, this change will be rolled back
|
|
// If he does afford it, we can skip checking the same thing later on, during execution
|
|
evm.StateDB.AddSlotToAccessList(contract.Address(), slot)
|
|
return params.ColdSloadCostEIP2929, nil
|
|
}
|
|
return params.WarmStorageReadCostEIP2929, nil
|
|
}
|
|
|
|
// gasExtCodeCopyEIP2929 implements extcodecopy according to EIP-2929
|
|
// EIP spec:
|
|
// > If the target is not in accessed_addresses,
|
|
// > charge COLD_ACCOUNT_ACCESS_COST gas, and add the address to accessed_addresses.
|
|
// > Otherwise, charge WARM_STORAGE_READ_COST gas.
|
|
func gasExtCodeCopyEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
|
|
// memory expansion first (dynamic part of pre-2929 implementation)
|
|
gas, err := gasExtCodeCopy(evm, contract, stack, mem, memorySize)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
addr := common.Address(stack.peek().Bytes20())
|
|
// Check slot presence in the access list
|
|
if !evm.StateDB.AddressInAccessList(addr) {
|
|
evm.StateDB.AddAddressToAccessList(addr)
|
|
var overflow bool
|
|
// We charge (cold-warm), since 'warm' is already charged as constantGas
|
|
if gas, overflow = math.SafeAdd(gas, params.ColdAccountAccessCostEIP2929-params.WarmStorageReadCostEIP2929); overflow {
|
|
return 0, ErrGasUintOverflow
|
|
}
|
|
return gas, nil
|
|
}
|
|
return gas, nil
|
|
}
|
|
|
|
// gasEip2929AccountCheck checks whether the first stack item (as address) is present in the access list.
|
|
// If it is, this method returns '0', otherwise 'cold-warm' gas, presuming that the opcode using it
|
|
// is also using 'warm' as constant factor.
|
|
// This method is used by:
|
|
// - extcodehash,
|
|
// - extcodesize,
|
|
// - (ext) balance
|
|
func gasEip2929AccountCheck(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
|
|
addr := common.Address(stack.peek().Bytes20())
|
|
// Check slot presence in the access list
|
|
if !evm.StateDB.AddressInAccessList(addr) {
|
|
// If the caller cannot afford the cost, this change will be rolled back
|
|
evm.StateDB.AddAddressToAccessList(addr)
|
|
// The warm storage read cost is already charged as constantGas
|
|
return params.ColdAccountAccessCostEIP2929 - params.WarmStorageReadCostEIP2929, nil
|
|
}
|
|
return 0, nil
|
|
}
|
|
|
|
func makeCallVariantGasCallEIP2929(oldCalculator gasFunc) gasFunc {
|
|
return func(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
|
|
addr := common.Address(stack.Back(1).Bytes20())
|
|
// Check slot presence in the access list
|
|
warmAccess := evm.StateDB.AddressInAccessList(addr)
|
|
// The WarmStorageReadCostEIP2929 (100) is already deducted in the form of a constant cost, so
|
|
// the cost to charge for cold access, if any, is Cold - Warm
|
|
coldCost := params.ColdAccountAccessCostEIP2929 - params.WarmStorageReadCostEIP2929
|
|
if !warmAccess {
|
|
evm.StateDB.AddAddressToAccessList(addr)
|
|
// Charge the remaining difference here already, to correctly calculate available
|
|
// gas for call
|
|
if !contract.UseGas(coldCost) {
|
|
return 0, ErrOutOfGas
|
|
}
|
|
}
|
|
// Now call the old calculator, which takes into account
|
|
// - create new account
|
|
// - transfer value
|
|
// - memory expansion
|
|
// - 63/64ths rule
|
|
gas, err := oldCalculator(evm, contract, stack, mem, memorySize)
|
|
if warmAccess || err != nil {
|
|
return gas, err
|
|
}
|
|
// In case of a cold access, we temporarily add the cold charge back, and also
|
|
// add it to the returned gas. By adding it to the return, it will be charged
|
|
// outside of this function, as part of the dynamic gas, and that will make it
|
|
// also become correctly reported to tracers.
|
|
contract.Gas += coldCost
|
|
return gas + coldCost, nil
|
|
}
|
|
}
|
|
|
|
var (
|
|
gasCallEIP2929 = makeCallVariantGasCallEIP2929(gasCall)
|
|
gasDelegateCallEIP2929 = makeCallVariantGasCallEIP2929(gasDelegateCall)
|
|
gasStaticCallEIP2929 = makeCallVariantGasCallEIP2929(gasStaticCall)
|
|
gasCallCodeEIP2929 = makeCallVariantGasCallEIP2929(gasCallCode)
|
|
gasSelfdestructEIP2929 = makeSelfdestructGasFn(true)
|
|
// gasSelfdestructEIP3529 implements the changes in EIP-2539 (no refunds)
|
|
gasSelfdestructEIP3529 = makeSelfdestructGasFn(false)
|
|
|
|
// gasSStoreEIP2929 implements gas cost for SSTORE according to EIP-2929
|
|
//
|
|
// When calling SSTORE, check if the (address, storage_key) pair is in accessed_storage_keys.
|
|
// If it is not, charge an additional COLD_SLOAD_COST gas, and add the pair to accessed_storage_keys.
|
|
// Additionally, modify the parameters defined in EIP 2200 as follows:
|
|
//
|
|
// Parameter Old value New value
|
|
// SLOAD_GAS 800 = WARM_STORAGE_READ_COST
|
|
// SSTORE_RESET_GAS 5000 5000 - COLD_SLOAD_COST
|
|
//
|
|
//The other parameters defined in EIP 2200 are unchanged.
|
|
// see gasSStoreEIP2200(...) in core/vm/gas_table.go for more info about how EIP 2200 is specified
|
|
gasSStoreEIP2929 = makeGasSStoreFunc(params.SstoreClearsScheduleRefundEIP2200)
|
|
|
|
// gasSStoreEIP2539 implements gas cost for SSTORE according to EIP-2539
|
|
// Replace `SSTORE_CLEARS_SCHEDULE` with `SSTORE_RESET_GAS + ACCESS_LIST_STORAGE_KEY_COST` (4,800)
|
|
gasSStoreEIP3529 = makeGasSStoreFunc(params.SstoreClearsScheduleRefundEIP3529)
|
|
)
|
|
|
|
// makeSelfdestructGasFn can create the selfdestruct dynamic gas function for EIP-2929 and EIP-2539
|
|
func makeSelfdestructGasFn(refundsEnabled bool) gasFunc {
|
|
gasFunc := func(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
|
|
var (
|
|
gas uint64
|
|
address = common.Address(stack.peek().Bytes20())
|
|
)
|
|
if !evm.StateDB.AddressInAccessList(address) {
|
|
// If the caller cannot afford the cost, this change will be rolled back
|
|
evm.StateDB.AddAddressToAccessList(address)
|
|
gas = params.ColdAccountAccessCostEIP2929
|
|
}
|
|
// if empty and transfers value
|
|
if evm.StateDB.Empty(address) && evm.StateDB.GetBalance(contract.Address()).Sign() != 0 {
|
|
gas += params.CreateBySelfdestructGas
|
|
}
|
|
if refundsEnabled && !evm.StateDB.HasSelfDestructed(contract.Address()) {
|
|
evm.StateDB.AddRefund(params.SelfdestructRefundGas)
|
|
}
|
|
return gas, nil
|
|
}
|
|
return gasFunc
|
|
}
|