Method Commit

core/state/statedb.go:582–628

Commit writes the state to the underlying in-memory trie database.

(deleteEmptyObjects bool)

// Commit writes the state to the underlying in-memory trie database.
func (s *StateDB) Commit(deleteEmptyObjects bool) (root common.Hash, err error) {
	defer s.clearJournalAndRefund()

	for addr := range s.journal.dirties {
		s.stateObjectsDirty[addr] = struct{}{}
	}
	// Commit objects to the trie.
	for addr, stateObject := range s.stateObjects {
		_, isDirty := s.stateObjectsDirty[addr]
		switch {
		case stateObject.suicided || (isDirty && deleteEmptyObjects && stateObject.empty()):
			// If the object has been removed, don't bother syncing it
			// and just mark it for deletion in the trie.
			s.deleteStateObject(stateObject)
		case isDirty:
			// Write any contract code associated with the state object
			if stateObject.code != nil && stateObject.dirtyCode {
				s.db.TrieDB().InsertBlob(common.BytesToHash(stateObject.CodeHash()), stateObject.code)
				stateObject.dirtyCode = false
			}
			// Write any storage changes in the state object to its storage trie.
			if err := stateObject.CommitTrie(s.db); err != nil {
				return common.Hash{}, err
			}
			// Update the object in the main account trie.
			s.updateStateObject(stateObject)
		}
		delete(s.stateObjectsDirty, addr)
	}
	// Write trie changes.
	root, err = s.trie.Commit(func(leaf []byte, parent common.Hash) error {
		var account Account
		if err := rlp.DecodeBytes(leaf, &account); err != nil {
			return nil
		}
		if account.Root != emptyState {
			s.db.TrieDB().Reference(account.Root, parent)
		}
		code := common.BytesToHash(account.CodeHash)
		if code != emptyCode {
			s.db.TrieDB().Reference(code, parent)
		}
		return nil
	})
	log.Debug("Trie cache stats after commit", "misses", trie.CacheMisses(), "unloads", trie.CacheUnloads())
	return root, err
}