From 98a477b3fd56a01e0c39f460a8c91c9289222d36 Mon Sep 17 00:00:00 2001
From: Dustin Xie <dahuaxie@gmail.com>
Date: Wed, 23 Mar 2022 15:48:54 -0700
Subject: [PATCH] [evm] implement EIP-3529

---
 action/protocol/execution/evm/evm.go      | 11 ++++--
 action/protocol/execution/evm/evm_test.go | 41 +++++++++++++++++++----
 2 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/action/protocol/execution/evm/evm.go b/action/protocol/execution/evm/evm.go
index 5cba20c6af..0b7a83d370 100644
--- a/action/protocol/execution/evm/evm.go
+++ b/action/protocol/execution/evm/evm.go
@@ -325,8 +325,9 @@ func getChainConfig(g genesis.Blockchain, height uint64) *params.ChainConfig {
 	if g.IsIceland(height) {
 		chainConfig.ChainID = new(big.Int).SetUint64(uint64(config.EVMNetworkID()))
 	}
-	// enable Berlin
+	// enable Berlin and London
 	chainConfig.BerlinBlock = new(big.Int).SetUint64(g.ToBeEnabledBlockHeight)
+	chainConfig.LondonBlock = new(big.Int).SetUint64(g.ToBeEnabledBlockHeight)
 	return &chainConfig
 }
 
@@ -365,8 +366,10 @@ func executeInEVM(ctx context.Context, evmParams *Params, stateDB *StateDBAdapte
 	var (
 		contractRawAddress = action.EmptyAddress
 		executor           = vm.AccountRef(evmParams.txCtx.Origin)
+		london             = evm.ChainConfig().IsLondon(evm.Context.BlockNumber)
 		ret                []byte
 		evmErr             error
+		refund             uint64
 	)
 	if evmParams.contract == nil {
 		// create contract
@@ -395,7 +398,11 @@ func executeInEVM(ctx context.Context, evmParams *Params, stateDB *StateDBAdapte
 	if stateDB.Error() != nil {
 		log.L().Debug("statedb error", zap.Error(stateDB.Error()))
 	}
-	refund := (evmParams.gas - remainingGas) / 2
+	if !london {
+		refund = (evmParams.gas - remainingGas) / params.RefundQuotient
+	} else {
+		refund = (evmParams.gas - remainingGas) / params.RefundQuotientEIP3529
+	}
 	if refund > stateDB.GetRefund() {
 		refund = stateDB.GetRefund()
 	}
diff --git a/action/protocol/execution/evm/evm_test.go b/action/protocol/execution/evm/evm_test.go
index 876d4d5a8f..999bf51eeb 100644
--- a/action/protocol/execution/evm/evm_test.go
+++ b/action/protocol/execution/evm/evm_test.go
@@ -9,6 +9,7 @@ package evm
 import (
 	"context"
 	"errors"
+	"math"
 	"math/big"
 	"testing"
 
@@ -149,14 +150,41 @@ func TestConstantinople(t *testing.T) {
 			"io1pcg2ja9krrhujpazswgz77ss46xgt88afqlk6y",
 			12289321,
 		},
-		// after Jutland
+		// Jutland - Kamchatka
 		{
 			action.EmptyAddress,
-			20000000,
+			13685401,
 		},
 		{
 			"io1pcg2ja9krrhujpazswgz77ss46xgt88afqlk6y",
-			20000000,
+			13816440,
+		},
+		// Kamchatka - LordHowe
+		{
+			action.EmptyAddress,
+			13816441,
+		},
+		{
+			"io1pcg2ja9krrhujpazswgz77ss46xgt88afqlk6y",
+			13979160,
+		},
+		// LordHowe - Midway
+		{
+			action.EmptyAddress,
+			13979161,
+		},
+		{
+			"io1pcg2ja9krrhujpazswgz77ss46xgt88afqlk6y",
+			16509240,
+		},
+		// after Midway
+		{
+			action.EmptyAddress,
+			16509241,
+		},
+		{
+			"io1pcg2ja9krrhujpazswgz77ss46xgt88afqlk6y",
+			math.MaxUint64,
 		},
 	}
 
@@ -235,12 +263,13 @@ func TestConstantinople(t *testing.T) {
 		require.Equal(isIceland, evmChainConfig.IsMuirGlacier(evm.Context.BlockNumber))
 		require.Equal(isIceland, chainRules.IsIstanbul)
 
-		// enable Berlin
+		// enable Berlin and London
 		isBerlin := g.IsToBeEnabled(e.height)
 		require.Equal(isBerlin, evmChainConfig.IsBerlin(evm.Context.BlockNumber))
 		require.Equal(isBerlin, chainRules.IsBerlin)
-		require.False(evmChainConfig.IsLondon(evm.Context.BlockNumber))
-		require.False(chainRules.IsLondon)
+		isLondon := g.IsToBeEnabled(e.height)
+		require.Equal(isLondon, evmChainConfig.IsLondon(evm.Context.BlockNumber))
+		require.Equal(isLondon, chainRules.IsLondon)
 		require.False(evmChainConfig.IsCatalyst(evm.Context.BlockNumber))
 		require.False(chainRules.IsCatalyst)
 	}