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core/vm, params: implement EIP2200, SSTORE optimizations (#19964)

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* core/vm, params: implement EIP2200, SSTORE optimizations

* core/vm, params: switch EIP2200 to Wei's version
This commit is contained in:
Péter Szilágyi 2019-08-19 14:39:38 +03:00 committed by GitHub
parent 9dfca5df4b
commit 3bb9b49afb
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 142 additions and 1 deletions
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7
core/vm/eips.go
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@ -27,6 +27,8 @@ import (
// defined jump tables are not polluted.
func EnableEIP(eipNum int, jt *JumpTable) error {
switch eipNum {
case 2200:
enable2200(jt)
case 1884:
enable1884(jt)
case 1344:
@ -83,3 +85,8 @@ func opChainID(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memo
stack.push(chainId)
return nil, nil
}
// enable2200 applies EIP-2200 (Rebalance net-metered SSTORE)
func enable2200(jt *JumpTable) {
jt[SSTORE].dynamicGas = gasSStoreEIP2200
}

57
core/vm/gas_table.go
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@ -17,6 +17,8 @@
package vm
import (
"errors"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/params"
@ -160,6 +162,61 @@ func gasSStore(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySi
return params.NetSstoreDirtyGas, nil
}
// 0. If *gasleft* is less than or equal to 2300, fail the current call.
// 1. If current value equals new value (this is a no-op), SSTORE_NOOP_GAS gas is deducted.
// 2. If current value does not equal new value:
// 2.1. If original value equals current value (this storage slot has not been changed by the current execution context):
// 2.1.1. If original value is 0, SSTORE_INIT_GAS gas is deducted.
// 2.1.2. Otherwise, SSTORE_CLEAN_GAS gas is deducted. If new value is 0, add SSTORE_CLEAR_REFUND to refund counter.
// 2.2. If original value does not equal current value (this storage slot is dirty), SSTORE_DIRTY_GAS gas is deducted. Apply both of the following clauses:
// 2.2.1. If original value is not 0:
// 2.2.1.1. If current value is 0 (also means that new value is not 0), subtract SSTORE_CLEAR_REFUND gas from refund counter. We can prove that refund counter will never go below 0.
// 2.2.1.2. If new value is 0 (also means that current value is not 0), add SSTORE_CLEAR_REFUND gas to refund counter.
// 2.2.2. If original value equals new value (this storage slot is reset):
// 2.2.2.1. If original value is 0, add SSTORE_INIT_REFUND to refund counter.
// 2.2.2.2. Otherwise, add SSTORE_CLEAN_REFUND gas to refund counter.
func gasSStoreEIP2200(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.Back(0)
current = evm.StateDB.GetState(contract.Address(), common.BigToHash(x))
)
value := common.BigToHash(y)
if current == value { // noop (1)
return params.SstoreNoopGasEIP2200, nil
}
original := evm.StateDB.GetCommittedState(contract.Address(), common.BigToHash(x))
if original == current {
if original == (common.Hash{}) { // create slot (2.1.1)
return params.SstoreInitGasEIP2200, nil
}
if value == (common.Hash{}) { // delete slot (2.1.2b)
evm.StateDB.AddRefund(params.SstoreClearRefundEIP2200)
}
return params.SstoreCleanGasEIP2200, nil // write existing slot (2.1.2)
}
if original != (common.Hash{}) {
if current == (common.Hash{}) { // recreate slot (2.2.1.1)
evm.StateDB.SubRefund(params.SstoreClearRefundEIP2200)
} else if value == (common.Hash{}) { // delete slot (2.2.1.2)
evm.StateDB.AddRefund(params.SstoreClearRefundEIP2200)
}
}
if original == value {
if original == (common.Hash{}) { // reset to original inexistent slot (2.2.2.1)
evm.StateDB.AddRefund(params.SstoreInitRefundEIP2200)
} else { // reset to original existing slot (2.2.2.2)
evm.StateDB.AddRefund(params.SstoreCleanRefundEIP2200)
}
}
return params.SstoreDirtyGasEIP2200, nil // dirty update (2.2)
}
func makeGasLog(n uint64) gasFunc {
return func(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
requestedSize, overflow := bigUint64(stack.Back(1))

70
core/vm/gas_table_test.go
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@ -16,7 +16,17 @@
package vm
import "testing"
import (
"math"
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/params"
)
func TestMemoryGasCost(t *testing.T) {
tests := []struct {
@ -37,3 +47,61 @@ func TestMemoryGasCost(t *testing.T) {
}
}
}
var eip2200Tests = []struct {
original byte
gaspool uint64
input string
used uint64
refund uint64
failure error
}{
{0, math.MaxUint64, "0x60006000556000600055", 1612, 0, nil}, // 0 -> 0 -> 0
{0, math.MaxUint64, "0x60006000556001600055", 20812, 0, nil}, // 0 -> 0 -> 1
{0, math.MaxUint64, "0x60016000556000600055", 20812, 19200, nil}, // 0 -> 1 -> 0
{0, math.MaxUint64, "0x60016000556002600055", 20812, 0, nil}, // 0 -> 1 -> 2
{0, math.MaxUint64, "0x60016000556001600055", 20812, 0, nil}, // 0 -> 1 -> 1
{1, math.MaxUint64, "0x60006000556000600055", 5812, 15000, nil}, // 1 -> 0 -> 0
{1, math.MaxUint64, "0x60006000556001600055", 5812, 4200, nil}, // 1 -> 0 -> 1
{1, math.MaxUint64, "0x60006000556002600055", 5812, 0, nil}, // 1 -> 0 -> 2
{1, math.MaxUint64, "0x60026000556000600055", 5812, 15000, nil}, // 1 -> 2 -> 0
{1, math.MaxUint64, "0x60026000556003600055", 5812, 0, nil}, // 1 -> 2 -> 3
{1, math.MaxUint64, "0x60026000556001600055", 5812, 4200, nil}, // 1 -> 2 -> 1
{1, math.MaxUint64, "0x60026000556002600055", 5812, 0, nil}, // 1 -> 2 -> 2
{1, math.MaxUint64, "0x60016000556000600055", 5812, 15000, nil}, // 1 -> 1 -> 0
{1, math.MaxUint64, "0x60016000556002600055", 5812, 0, nil}, // 1 -> 1 -> 2
{1, math.MaxUint64, "0x60016000556001600055", 1612, 0, nil}, // 1 -> 1 -> 1
{0, math.MaxUint64, "0x600160005560006000556001600055", 40818, 19200, nil}, // 0 -> 1 -> 0 -> 1
{1, math.MaxUint64, "0x600060005560016000556000600055", 10818, 19200, nil}, // 1 -> 0 -> 1 -> 0
{1, 2306, "0x6001600055", 2306, 0, ErrOutOfGas}, // 1 -> 1 (2300 sentry + 2xPUSH)
{1, 2307, "0x6001600055", 806, 0, nil}, // 1 -> 1 (2301 sentry + 2xPUSH)
}
func TestEIP2200(t *testing.T) {
for i, tt := range eip2200Tests {
address := common.BytesToAddress([]byte("contract"))
statedb, _ := state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()))
statedb.CreateAccount(address)
statedb.SetCode(address, hexutil.MustDecode(tt.input))
statedb.SetState(address, common.Hash{}, common.BytesToHash([]byte{tt.original}))
statedb.Finalise(true) // Push the state into the "original" slot
vmctx := Context{
CanTransfer: func(StateDB, common.Address, *big.Int) bool { return true },
Transfer: func(StateDB, common.Address, common.Address, *big.Int) {},
}
vmenv := NewEVM(vmctx, statedb, params.AllEthashProtocolChanges, Config{ExtraEips: []int{2200}})
_, gas, err := vmenv.Call(AccountRef(common.Address{}), address, nil, tt.gaspool, new(big.Int))
if err != tt.failure {
t.Errorf("test %d: failure mismatch: have %v, want %v", i, err, tt.failure)
}
if used := tt.gaspool - gas; used != tt.used {
t.Errorf("test %d: gas used mismatch: have %v, want %v", i, used, tt.used)
}
if refund := vmenv.StateDB.GetRefund(); refund != tt.refund {
t.Errorf("test %d: gas refund mismatch: have %v, want %v", i, refund, tt.refund)
}
}
}

9
params/protocol_params.go
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@ -52,6 +52,15 @@ const (
NetSstoreResetRefund uint64 = 4800 // Once per SSTORE operation for resetting to the original non-zero value
NetSstoreResetClearRefund uint64 = 19800 // Once per SSTORE operation for resetting to the original zero value
SstoreSentryGasEIP2200 uint64 = 2300 // Minimum gas required to be present for an SSTORE call, not consumed
SstoreNoopGasEIP2200 uint64 = 800 // Once per SSTORE operation if the value doesn't change.
SstoreDirtyGasEIP2200 uint64 = 800 // Once per SSTORE operation if a dirty value is changed.
SstoreInitGasEIP2200 uint64 = 20000 // Once per SSTORE operation from clean zero to non-zero
SstoreInitRefundEIP2200 uint64 = 19200 // Once per SSTORE operation for resetting to the original zero value
SstoreCleanGasEIP2200 uint64 = 5000 // Once per SSTORE operation from clean non-zero to something else
SstoreCleanRefundEIP2200 uint64 = 4200 // Once per SSTORE operation for resetting to the original non-zero value
SstoreClearRefundEIP2200 uint64 = 15000 // Once per SSTORE operation for clearing an originally existing storage slot
JumpdestGas uint64 = 1 // Once per JUMPDEST operation.
EpochDuration uint64 = 30000 // Duration between proof-of-work epochs.