feat: precompiled contract poc

app/app.go

@@ -349,9 +349,16 @@ func NewEthermintApp(
 	)
 
 	app.EvmKeeper = evmkeeper.NewKeeper(
-		appCodec, keys[evmtypes.StoreKey], tkeys[evmtypes.TransientKey], app.GetSubspace(evmtypes.ModuleName),
-		app.AccountKeeper, app.BankKeeper, app.StakingKeeper, app.FeeMarketKeeper,
+		appCodec,
+		keys[evmtypes.StoreKey],
+		tkeys[evmtypes.TransientKey],
+		app.GetSubspace(evmtypes.ModuleName),
+		app.AccountKeeper,
+		app.BankKeeper,
+		app.StakingKeeper,
+		app.FeeMarketKeeper,
 		tracer,
+		nil,
 	)
 
 	// Create IBC Keeper
@@ -646,6 +653,8 @@ func (app *EthermintApp) BlockedAddrs() map[string]bool {
 		blockedAddrs[authtypes.NewModuleAddress(acc).String()] = !allowedReceivingModAcc[acc]
 	}
 
+	// TODO(dudong2): need to add precompiled contract address?
+
 	return blockedAddrs
 }
 

go.mod

@@ -185,6 +185,8 @@ require (
 replace (
 	github.com/99designs/keyring => github.com/cosmos/keyring v1.1.7-0.20210622111912-ef00f8ac3d76
 	github.com/confio/ics23/go => github.com/cosmos/cosmos-sdk/ics23/go v0.8.0
+	github.com/cosmos/cosmos-sdk => github.com/b-harvest/cosmos-sdk v0.0.0-20240826083719-aa4a1aa73255
+	github.com/ethereum/go-ethereum => github.com/b-harvest/go-ethereum v0.0.0-20240909063629-1d4be499b60e
 	github.com/gogo/protobuf => github.com/regen-network/protobuf v1.3.3-alpha.regen.1
 	github.com/tendermint/tendermint => github.com/cometbft/cometbft v0.34.33
 	google.golang.org/grpc => google.golang.org/grpc v1.33.2

x/evm/keeper/keeper.go

@@ -3,23 +3,28 @@ package keeper
 import (
 	"math/big"
 
+	"github.com/tendermint/tendermint/libs/log"
+
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/store/prefix"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/params"
-	"github.com/tendermint/tendermint/libs/log"
 
 	ethermint "github.com/evmos/ethermint/types"
 	"github.com/evmos/ethermint/x/evm/statedb"
 	"github.com/evmos/ethermint/x/evm/types"
 )
 
+// CustomContractFn defines a custom precompiled contract generator with ctx, rules and returns a precompiled contract.
+type CustomContractFn func(sdk.Context, params.Rules) vm.PrecompiledContract
+
 // Keeper grants access to the EVM module state and implements the go-ethereum StateDB interface.
 type Keeper struct {
 	// Protobuf codec
@@ -53,15 +58,21 @@ type Keeper struct {
 
 	// EVM Hooks for tx post-processing
 	hooks types.EvmHooks
+
+	customContractFns []CustomContractFn
 }
 
 // NewKeeper generates new evm module keeper
 func NewKeeper(
 	cdc codec.BinaryCodec,
-	storeKey, transientKey sdk.StoreKey, paramSpace paramtypes.Subspace,
-	ak types.AccountKeeper, bankKeeper types.BankKeeper, sk types.StakingKeeper,
+	storeKey, transientKey sdk.StoreKey,
+	paramSpace paramtypes.Subspace,
+	ak types.AccountKeeper,
+	bankKeeper types.BankKeeper,
+	sk types.StakingKeeper,
 	fmk types.FeeMarketKeeper,
 	tracer string,
+	customContractFns []CustomContractFn,
 ) *Keeper {
 	// ensure evm module account is set
 	if addr := ak.GetModuleAddress(types.ModuleName); addr == nil {
@@ -75,15 +86,16 @@ func NewKeeper(
 
 	// NOTE: we pass in the parameter space to the CommitStateDB in order to use custom denominations for the EVM operations
 	return &Keeper{
-		cdc:             cdc,
-		paramSpace:      paramSpace,
-		accountKeeper:   ak,
-		bankKeeper:      bankKeeper,
-		stakingKeeper:   sk,
-		feeMarketKeeper: fmk,
-		storeKey:        storeKey,
-		transientKey:    transientKey,
-		tracer:          tracer,
+		cdc:               cdc,
+		paramSpace:        paramSpace,
+		accountKeeper:     ak,
+		bankKeeper:        bankKeeper,
+		stakingKeeper:     sk,
+		feeMarketKeeper:   fmk,
+		storeKey:          storeKey,
+		transientKey:      transientKey,
+		tracer:            tracer,
+		customContractFns: customContractFns,
 	}
 }
 

x/evm/keeper/state_transition.go

@@ -1,8 +1,10 @@
 package keeper
 
 import (
+	"bytes"
 	"math"
 	"math/big"
+	"sort"
 
 	tmtypes "github.com/tendermint/tendermint/types"
 
@@ -93,7 +95,27 @@ func (k *Keeper) NewEVM(
 		tracer = k.Tracer(ctx, msg, cfg.ChainConfig)
 	}
 	vmConfig := k.VMConfig(ctx, msg, cfg, tracer)
-	return vm.NewEVM(blockCtx, txCtx, stateDB, cfg.ChainConfig, vmConfig)
+
+	rules := cfg.ChainConfig.Rules(big.NewInt(ctx.BlockHeight()), cfg.ChainConfig.MergeNetsplitBlock != nil)
+	contracts := make(map[common.Address]vm.PrecompiledContract)
+	active := make([]common.Address, 0)
+	for addr, c := range vm.DefaultPrecompiles(rules) {
+		contracts[addr] = c
+		active = append(active, addr)
+	}
+	for _, fn := range k.customContractFns {
+		c := fn(ctx, rules)
+		addr := c.Address()
+		contracts[addr] = c
+		active = append(active, addr)
+	}
+	sort.SliceStable(active, func(i, j int) bool {
+		return bytes.Compare(active[i].Bytes(), active[j].Bytes()) < 0
+	})
+
+	evm := vm.NewEVM(blockCtx, txCtx, stateDB, cfg.ChainConfig, vmConfig)
+	evm.WithPrecompiles(contracts, active)
+	return evm
 }
 
 // VMConfig creates an EVM configuration from the debug setting and the extra EIPs enabled on the
@@ -392,7 +414,7 @@ func (k *Keeper) ApplyMessageWithConfig(ctx sdk.Context,
 	// access list preparation is moved from ante handler to here, because it's needed when `ApplyMessage` is called
 	// under contexts where ante handlers are not run, for example `eth_call` and `eth_estimateGas`.
 	if rules := cfg.ChainConfig.Rules(big.NewInt(ctx.BlockHeight()), cfg.ChainConfig.MergeNetsplitBlock != nil); rules.IsBerlin {
-		stateDB.PrepareAccessList(msg.From(), msg.To(), vm.ActivePrecompiles(rules), msg.AccessList())
+		stateDB.PrepareAccessList(msg.From(), msg.To(), evm.ActivePrecompiles(rules), msg.AccessList())
 	}
 
 	if contractCreation {

x/evm/statedb/journal.go

@@ -22,6 +22,8 @@ import (
 	"sort"
 
 	"github.com/ethereum/go-ethereum/common"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
 // journalEntry is a modification entry in the state change journal that can be
@@ -139,6 +141,10 @@ type (
 		address *common.Address
 		slot    *common.Hash
 	}
+	precompileChange struct {
+		ms sdk.MultiStore
+		es sdk.Events
+	}
 )
 
 func (ch createObjectChange) revert(s *StateDB) {
@@ -241,3 +247,11 @@ func (ch accessListAddSlotChange) revert(s *StateDB) {
 func (ch accessListAddSlotChange) dirtied() *common.Address {
 	return nil
 }
+
+func (ch precompileChange) revert(s *StateDB) {
+	s.RevertWithMultiStoreSnapshot(ch.ms)
+}
+
+func (ch precompileChange) dirtied() *common.Address {
+	return nil
+}

x/evm/statedb/statedb.go

@@ -1,18 +1,22 @@
 package statedb
 
 import (
+	"errors"
 	"fmt"
 	"math/big"
 	"sort"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+
 	"github.com/ethereum/go-ethereum/common"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 )
 
+type EventConverter = func(sdk.Event) (*ethtypes.Log, error)
+
 // revision is the identifier of a version of state.
 // it consists of an auto-increment id and a journal index.
 // it's safer to use than using journal index alone.
@@ -32,6 +36,9 @@ type StateDB struct {
 	keeper Keeper
 	ctx    sdk.Context
 
+	cacheCtx   sdk.Context
+	writeCache func()
+
 	// Journal of state modifications. This is the backbone of
 	// Snapshot and RevertToSnapshot.
 	journal        *journal
@@ -283,6 +290,57 @@ func (s *StateDB) setStateObject(object *stateObject) {
 	s.stateObjects[object.Address()] = object
 }
 
+func (s *StateDB) GetCacheContext() (sdk.Context, error) {
+	if s.writeCache == nil {
+		if s.ctx.MultiStore() == nil {
+			return s.ctx, errors.New("ctx has no multi store")
+		}
+		s.cacheCtx, s.writeCache = s.ctx.CacheContext()
+	}
+
+	return s.cacheCtx, nil
+}
+
+func (s *StateDB) MultiStoreSnapshot() (sdk.CacheMultiStore, error) {
+	ctx, err := s.GetCacheContext()
+	if err != nil { // means s.ctx.MultiStore() == nil
+		return nil, err
+	}
+
+	cms := ctx.MultiStore().(sdk.CacheMultiStore)
+	snapshot := cms.Copy()
+	return snapshot, nil
+}
+
+func (s *StateDB) RevertWithMultiStoreSnapshot(snapshot sdk.MultiStore) {
+	s.cacheCtx = s.cacheCtx.
+		WithMultiStore(snapshot).
+		WithEventManager(sdk.NewEventManager())
+}
+
+// If revert is occurred, the snapshot of journal is overwrited to MultiStore of ctx.
+// The events is just for debug.
+func (s *StateDB) PostPrecompileProcessing(snapshot sdk.MultiStore, events sdk.Events, contract common.Address, converter EventConverter) {
+	// convert native events to evm logs
+	if converter != nil && len(events) > 0 {
+		for _, event := range events {
+			log, err := converter(event)
+			if err != nil {
+				s.ctx.Logger().Error("failed to convert event", "err", err)
+				continue
+			}
+			if log == nil {
+				continue
+			}
+
+			log.Address = contract
+			s.AddLog(log)
+		}
+	}
+
+	s.journal.append(precompileChange{snapshot, events})
+}
+
 /*
  * SETTERS
  */
@@ -436,6 +494,11 @@ func (s *StateDB) RevertToSnapshot(revid int) {
 // Commit writes the dirty states to keeper
 // the StateDB object should be discarded after committed.
 func (s *StateDB) Commit() error {
+	// write all store updates from precompile
+	if s.writeCache != nil {
+		s.writeCache()
+	}
+
 	for _, addr := range s.journal.sortedDirties() {
 		obj := s.stateObjects[addr]
 		if obj.suicided {

x/evm/types/tracer.go

@@ -30,7 +30,7 @@ func NewTracer(tracer string, msg core.Message, cfg *params.ChainConfig, height
 
 	switch tracer {
 	case TracerAccessList:
-		preCompiles := vm.ActivePrecompiles(cfg.Rules(big.NewInt(height), cfg.MergeNetsplitBlock != nil))
+		preCompiles := vm.DefaultActivePrecompiles(cfg.Rules(big.NewInt(height), cfg.MergeNetsplitBlock != nil))
 		return logger.NewAccessListTracer(msg.AccessList(), msg.From(), *msg.To(), preCompiles)
 	case TracerJSON:
 		return logger.NewJSONLogger(logCfg, os.Stderr)