feat: AddPrecompileFn on stateObject not needed (cosmos#511)

* Problem: AddPrecompileFn on stateObject not needed

what is does is only add a journal entry, not related to the state
object at all.

Solution:
- remove the method, move the logic to statedb directly.

* remove unused parameter

* changelog

---------

Co-authored-by: Alex | Interchain Labs <[email protected]>

Author: yihuang

CHANGELOG.md

@@ -19,6 +19,7 @@
 - [\#467](https://github.com/cosmos/evm/pull/467) Replace GlobalEVMMempool by passing to JSONRPC on initiate.
 - [\#352](https://github.com/cosmos/evm/pull/352) Remove the creation of a Geth EVM instance, stateDB during the AnteHandler balance check.
 - [\#496](https://github.com/cosmos/evm/pull/496) Simplify mempool instantiation by using configs instead of objects.
+- [\#511](https://github.com/cosmos/evm/pull/511) Minor code cleanup for `AddPrecompileFn`.
 
 ### FEATURES
 

precompiles/common/precompile.go

@@ -73,7 +73,7 @@ func (p Precompile) RunSetup(
 
 	// add precompileCall entry on the stateDB journal
 	// this allows to revert the changes within an evm tx
-	err = stateDB.AddPrecompileFn(p.Address(), snapshot, events)
+	err = stateDB.AddPrecompileFn(snapshot, events)
 	if err != nil {
 		return sdk.Context{}, nil, nil, uint64(0), nil, err
 	}

x/vm/statedb/state_object.go

@@ -8,8 +8,6 @@ import (
 	"github.com/holiman/uint256"
 
 	"github.com/cosmos/evm/x/vm/types"
-
-	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
 // Account is the Ethereum consensus representation of accounts.
@@ -136,16 +134,6 @@ func (s *stateObject) SetBalance(amount *uint256.Int) uint256.Int {
 	return prev
 }
 
-// AddPrecompileFn appends to the journal an entry
-// with a snapshot of the multi-store and events
-// previous to the precompile call
-func (s *stateObject) AddPrecompileFn(snapshot int, events sdk.Events) {
-	s.db.journal.append(precompileCallChange{
-		snapshot: snapshot,
-		events:   events,
-	})
-}
-
 func (s *stateObject) setBalance(amount *uint256.Int) {
 	s.account.Balance = amount
 }

x/vm/statedb/statedb.go

@@ -434,12 +434,11 @@ func (s *StateDB) setStateObject(object *stateObject) {
 // AddPrecompileFn adds a precompileCall journal entry
 // with a snapshot of the multi-store and events previous
 // to the precompile call.
-func (s *StateDB) AddPrecompileFn(addr common.Address, snapshot int, events sdk.Events) error {
-	stateObject := s.getOrNewStateObject(addr)
-	if stateObject == nil {
-		return fmt.Errorf("could not add precompile call to address %s. State object not found", addr)
-	}
-	stateObject.AddPrecompileFn(snapshot, events)
+func (s *StateDB) AddPrecompileFn(snapshot int, events sdk.Events) error {
+	s.journal.append(precompileCallChange{
+		snapshot: snapshot,
+		events:   events,
+	})
 	s.precompileCallsCounter++
 	if s.precompileCallsCounter > types.MaxPrecompileCalls {
 		return fmt.Errorf("max calls to precompiles (%d) reached", types.MaxPrecompileCalls)