core/state: separate hashes and committer, collapse on commit (ethereum#20481)

Author: gzliudan

core/state/state_object.go

@@ -291,10 +291,13 @@ func (s *stateObject) finalise() {
 }
 
 // updateTrie writes cached storage modifications into the object's storage trie.
+// It will return nil if the trie has not been loaded and no changes have been made
 func (s *stateObject) updateTrie(db Database) Trie {
 	// Make sure all dirty slots are finalized into the pending storage area
 	s.finalise()
-
+	if len(s.pendingStorage) == 0 {
+		return s.trie
+	}
 	// Track the amount of time wasted on updating the storage trie
 	defer func(start time.Time) { s.db.StorageUpdates += time.Since(start) }(time.Now())
 	// Insert all the pending updates into the trie
@@ -322,8 +325,10 @@ func (s *stateObject) updateTrie(db Database) Trie {
 
 // UpdateRoot sets the trie root to the current root hash of
 func (s *stateObject) updateRoot(db Database) {
-	s.updateTrie(db)
-
+	// If nothing changed, don't bother with hashing anything
+	if s.updateTrie(db) == nil {
+		return
+	}
 	// Track the amount of time wasted on hashing the storage trie
 	defer func(start time.Time) { s.db.StorageHashes += time.Since(start) }(time.Now())
 
@@ -333,7 +338,10 @@ func (s *stateObject) updateRoot(db Database) {
 // CommitTrie the storage trie of the object to dwb.
 // This updates the trie root.
 func (s *stateObject) CommitTrie(db Database) error {
-	s.updateTrie(db)
+	// If nothing changed, don't bother with hashing anything
+	if s.updateTrie(db) == nil {
+		return nil
+	}
 	if s.dbErr != nil {
 		return s.dbErr
 	}

core/state/statedb.go

@@ -342,7 +342,8 @@ func (s *StateDB) StorageTrie(addr common.Address) Trie {
 		return nil
 	}
 	cpy := stateObject.deepCopy(s, nil)
-	return cpy.updateTrie(s.db)
+	cpy.updateTrie(s.db)
+	return cpy.getTrie(s.db)
 }
 
 func (s *StateDB) HasSelfDestructed(addr common.Address) bool {