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// Copyright 2019 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 (
"fmt"
"sort"
"github.com/ava-labs/coreth/params"
"github.com/holiman/uint256"
)
var activators = map[int]func(*JumpTable){
2200: enable2200,
1884: enable1884,
1344: enable1344,
2315: enable2315,
}
// EnableEIP enables the given EIP on the config.
// This operation writes in-place, and callers need to ensure that the globally
// defined jump tables are not polluted.
func EnableEIP(eipNum int, jt *JumpTable) error {
enablerFn, ok := activators[eipNum]
if !ok {
return fmt.Errorf("undefined eip %d", eipNum)
}
enablerFn(jt)
return nil
}
func ValidEip(eipNum int) bool {
_, ok := activators[eipNum]
return ok
}
func ActivateableEips() []string {
var nums []string
for k := range activators {
nums = append(nums, fmt.Sprintf("%d", k))
}
sort.Strings(nums)
return nums
}
// enable1884 applies EIP-1884 to the given jump table:
// - Increase cost of BALANCE to 700
// - Increase cost of EXTCODEHASH to 700
// - Increase cost of SLOAD to 800
// - Define SELFBALANCE, with cost GasFastStep (5)
func enable1884(jt *JumpTable) {
// Gas cost changes
jt[SLOAD].constantGas = params.SloadGasEIP1884
jt[BALANCE].constantGas = params.BalanceGasEIP1884
jt[EXTCODEHASH].constantGas = params.ExtcodeHashGasEIP1884
// New opcode
jt[SELFBALANCE] = &operation{
execute: opSelfBalance,
constantGas: GasFastStep,
minStack: minStack(0, 1),
maxStack: maxStack(0, 1),
}
}
func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
balance, _ := uint256.FromBig(interpreter.evm.StateDB.GetBalance(callContext.contract.Address()))
callContext.stack.push(balance)
return nil, nil
}
// enable1344 applies EIP-1344 (ChainID Opcode)
// - Adds an opcode that returns the current chain’s EIP-155 unique identifier
func enable1344(jt *JumpTable) {
// New opcode
jt[CHAINID] = &operation{
execute: opChainID,
constantGas: GasQuickStep,
minStack: minStack(0, 1),
maxStack: maxStack(0, 1),
}
}
// opChainID implements CHAINID opcode
func opChainID(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
chainId, _ := uint256.FromBig(interpreter.evm.chainConfig.ChainID)
callContext.stack.push(chainId)
return nil, nil
}
// enable2200 applies EIP-2200 (Rebalance net-metered SSTORE)
func enable2200(jt *JumpTable) {
jt[SLOAD].constantGas = params.SloadGasEIP2200
jt[SSTORE].dynamicGas = gasSStoreEIP2200
}
// enable2315 applies EIP-2315 (Simple Subroutines)
// - Adds opcodes that jump to and return from subroutines
func enable2315(jt *JumpTable) {
// New opcode
jt[BEGINSUB] = &operation{
execute: opBeginSub,
constantGas: GasQuickStep,
minStack: minStack(0, 0),
maxStack: maxStack(0, 0),
}
// New opcode
jt[JUMPSUB] = &operation{
execute: opJumpSub,
constantGas: GasSlowStep,
minStack: minStack(1, 0),
maxStack: maxStack(1, 0),
jumps: true,
}
// New opcode
jt[RETURNSUB] = &operation{
execute: opReturnSub,
constantGas: GasFastStep,
minStack: minStack(0, 0),
maxStack: maxStack(0, 0),
jumps: true,
}
}
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