From d235e2c6a5788ec4a6cff15a16f56b38a3876a0d Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Sun, 28 Jun 2020 14:47:41 -0400
Subject: ...

---
 core/vm/eips.go | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 core/vm/eips.go

(limited to 'core/vm/eips.go')

diff --git a/core/vm/eips.go b/core/vm/eips.go
new file mode 100644
index 0000000..75e5fb1
--- /dev/null
+++ b/core/vm/eips.go
@@ -0,0 +1,92 @@
+// 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"
+
+	"github.com/ava-labs/coreth/params"
+)
+
+// 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 {
+	switch eipNum {
+	case 2200:
+		enable2200(jt)
+	case 1884:
+		enable1884(jt)
+	case 1344:
+		enable1344(jt)
+	default:
+		return fmt.Errorf("undefined eip %d", eipNum)
+	}
+	return nil
+}
+
+// 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[BALANCE].constantGas = params.BalanceGasEIP1884
+	jt[EXTCODEHASH].constantGas = params.ExtcodeHashGasEIP1884
+	jt[SLOAD].constantGas = params.SloadGasEIP1884
+
+	// New opcode
+	jt[SELFBALANCE] = operation{
+		execute:     opSelfBalance,
+		constantGas: GasFastStep,
+		minStack:    minStack(0, 1),
+		maxStack:    maxStack(0, 1),
+		valid:       true,
+	}
+}
+
+func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
+	balance := interpreter.intPool.get().Set(interpreter.evm.StateDB.GetBalance(contract.Address()))
+	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),
+		valid:       true,
+	}
+}
+
+// opChainID implements CHAINID opcode
+func opChainID(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
+	chainId := interpreter.intPool.get().Set(interpreter.evm.chainConfig.ChainID)
+	stack.push(chainId)
+	return nil, nil
+}
+
+// enable2200 applies EIP-2200 (Rebalance net-metered SSTORE)
+func enable2200(jt *JumpTable) {
+	jt[SSTORE].dynamicGas = gasSStoreEIP2200
+}
-- 
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