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63 lines
2.1 KiB
63 lines
2.1 KiB
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/params"
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)
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// EnableEIP enables the given EIP on the config.
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// This operation writes in-place, and callers need to ensure that the globally
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// defined jump tables are not polluted.
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func EnableEIP(eipNum int, jt *JumpTable) error {
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switch eipNum {
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case 1884:
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enable1884(jt)
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default:
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return fmt.Errorf("undefined eip %d", eipNum)
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}
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return nil
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}
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// enable1884 applies EIP-1884 to the given jump table:
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// - Increase cost of BALANCE to 700
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// - Increase cost of EXTCODEHASH to 700
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// - Increase cost of SLOAD to 800
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// - Define SELFBALANCE, with cost GasFastStep (5)
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func enable1884(jt *JumpTable) {
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// Gas cost changes
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jt[BALANCE].constantGas = params.BalanceGasEIP1884
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jt[EXTCODEHASH].constantGas = params.ExtcodeHashGasEIP1884
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jt[SLOAD].constantGas = params.SloadGasEIP1884
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// New opcode
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jt[SELFBALANCE] = operation{
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execute: opSelfBalance,
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constantGas: GasFastStep,
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minStack: minStack(0, 1),
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maxStack: maxStack(0, 1),
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valid: true,
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}
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}
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func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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balance := interpreter.intPool.get().Set(interpreter.evm.StateDB.GetBalance(contract.Address()))
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stack.push(balance)
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return nil, nil
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}
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