func (self *StateDB) updateStateObject(stateObject *stateObject) {
	addr := stateObject.Address()
	data, err := rlp.EncodeToBytes(stateObject)
	if err != nil {
		panic(fmt.Errorf("can't encode object at %x: %v", addr[:], err))
	}
	self.setError(self.trie.TryUpdate(addr[:], data))
}
Setting, updating & deleting state object methods.

updateStateObject writes the given object to the trie.
package state
import (
	"errors"
	"fmt"
	"math/big"
	"sort"
	"github.com/dappledger/AnnChain/eth/common"
	"github.com/dappledger/AnnChain/eth/core/types"
	"github.com/dappledger/AnnChain/eth/crypto"
	"github.com/dappledger/AnnChain/eth/log"
	"github.com/dappledger/AnnChain/eth/rlp"
	"github.com/dappledger/AnnChain/eth/trie"
)
type revision struct {
	id           int
	journalIndex int
}
var (
	emptyState = crypto.Keccak256Hash(nil)
	emptyCode = crypto.Keccak256Hash(nil)
)
type proofList [][]byte
func (n *proofList) Put(key []byte, value []byte) error {
	*n = append(*n, value)
	return nil
}
type StateDB struct {
	db   Database
	trie Trie
	stateObjects      map[common.Address]*stateObject
	stateObjectsDirty map[common.Address]struct{}
	dbErr error
	refund uint64
	thash, bhash common.Hash
	txIndex      int
	logs         map[common.Hash][]*types.Log
	logSize      uint
	preimages map[common.Hash][]byte
	journal        *journal
	validRevisions []revision
	nextRevisionId int
}
func New(root common.Hash, db Database) (*StateDB, error) {
	tr, err := db.OpenTrie(root)
	if err != nil {
		return nil, err
	}
	return &StateDB{
		db:                db,
		trie:              tr,
		stateObjects:      make(map[common.Address]*stateObject),
		stateObjectsDirty: make(map[common.Address]struct{}),
		logs:              make(map[common.Hash][]*types.Log),
		preimages:         make(map[common.Hash][]byte),
		journal:           newJournal(),
	}, nil
}
func (self *StateDB) setError(err error) {
	if self.dbErr == nil {
		self.dbErr = err
	}
}
func (self *StateDB) Error() error {
	return self.dbErr
}
func (self *StateDB) Reset(root common.Hash) error {
	tr, err := self.db.OpenTrie(root)
	if err != nil {
		return err
	}
	self.trie = tr
	self.stateObjects = make(map[common.Address]*stateObject)
	self.stateObjectsDirty = make(map[common.Address]struct{})
	self.thash = common.Hash{}
	self.bhash = common.Hash{}
	self.txIndex = 0
	self.logs = make(map[common.Hash][]*types.Log)
	self.logSize = 0
	self.preimages = make(map[common.Hash][]byte)
	self.clearJournalAndRefund()
	return nil
}
func (self *StateDB) AddLog(log *types.Log) {
	self.journal.append(addLogChange{txhash: self.thash})
	log.TxHash = self.thash
	log.BlockHash = self.bhash
	log.TxIndex = uint(self.txIndex)
	log.Index = self.logSize
	self.logs[self.thash] = append(self.logs[self.thash], log)
	self.logSize++
}
func (self *StateDB) GetLogs(hash common.Hash) []*types.Log {
	return self.logs[hash]
}
func (self *StateDB) Logs() []*types.Log {
	var logs []*types.Log
	for _, lgs := range self.logs {
		logs = append(logs, lgs...)
	}
	return logs
}
func (self *StateDB) AddPreimage(hash common.Hash, preimage []byte) {
	if _, ok := self.preimages[hash]; !ok {
		self.journal.append(addPreimageChange{hash: hash})
		pi := make([]byte, len(preimage))
		copy(pi, preimage)
		self.preimages[hash] = pi
	}
}
func (self *StateDB) Preimages() map[common.Hash][]byte {
	return self.preimages
}
func (self *StateDB) AddRefund(gas uint64) {
	self.journal.append(refundChange{prev: self.refund})
	self.refund += gas
}
func (self *StateDB) SubRefund(gas uint64) {
	self.journal.append(refundChange{prev: self.refund})
	if gas > self.refund {
		panic("Refund counter below zero")
	}
	self.refund -= gas
}
func (self *StateDB) Exist(addr common.Address) bool {
	return self.getStateObject(addr) != nil
}
func (self *StateDB) Empty(addr common.Address) bool {
	so := self.getStateObject(addr)
	return so == nil || so.empty()
}
func (self *StateDB) GetBalance(addr common.Address) *big.Int {
	stateObject := self.getStateObject(addr)
	if stateObject != nil {
		return stateObject.Balance()
	}
	return common.Big0
}
func (self *StateDB) GetNonce(addr common.Address) uint64 {
	stateObject := self.getStateObject(addr)
	if stateObject != nil {
		return stateObject.Nonce()
	}
	return 0
}
func (self *StateDB) GetCode(addr common.Address) []byte {
	stateObject := self.getStateObject(addr)
	if stateObject != nil {
		return stateObject.Code(self.db)
	}
	return nil
}
func (self *StateDB) GetCodeSize(addr common.Address) int {
	stateObject := self.getStateObject(addr)
	if stateObject == nil {
		return 0
	}
	if stateObject.code != nil {
		return len(stateObject.code)
	}
	size, err := self.db.ContractCodeSize(stateObject.addrHash, common.BytesToHash(stateObject.CodeHash()))
	if err != nil {
		self.setError(err)
	}
	return size
}
func (self *StateDB) GetCodeHash(addr common.Address) common.Hash {
	stateObject := self.getStateObject(addr)
	if stateObject == nil {
		return common.Hash{}
	}
	return common.BytesToHash(stateObject.CodeHash())
}
func (self *StateDB) GetState(addr common.Address, hash common.Hash) common.Hash {
	stateObject := self.getStateObject(addr)
	if stateObject != nil {
		return stateObject.GetState(self.db, hash)
	}
	return common.Hash{}
}
func (self *StateDB) GetProof(a common.Address) ([][]byte, error) {
	var proof proofList
	err := self.trie.Prove(crypto.Keccak256(a.Bytes()), 0, &proof)
	return [][]byte(proof), err
}
func (self *StateDB) GetStorageProof(a common.Address, key common.Hash) ([][]byte, error) {
	var proof proofList
	trie := self.StorageTrie(a)
	if trie == nil {
		return proof, errors.New("storage trie for requested address does not exist")
	}
	err := trie.Prove(crypto.Keccak256(key.Bytes()), 0, &proof)
	return [][]byte(proof), err
}
func (self *StateDB) GetCommittedState(addr common.Address, hash common.Hash) common.Hash {
	stateObject := self.getStateObject(addr)
	if stateObject != nil {
		return stateObject.GetCommittedState(self.db, hash)
	}
	return common.Hash{}
}
func (self *StateDB) Database() Database {
	return self.db
}
func (self *StateDB) StorageTrie(addr common.Address) Trie {
	stateObject := self.getStateObject(addr)
	if stateObject == nil {
		return nil
	}
	cpy := stateObject.deepCopy(self)
	return cpy.updateTrie(self.db)
}
func (self *StateDB) HasSuicided(addr common.Address) bool {
	stateObject := self.getStateObject(addr)
	if stateObject != nil {
		return stateObject.suicided
	}
	return false
}
func (self *StateDB) AddBalance(addr common.Address, amount *big.Int) {
	stateObject := self.GetOrNewStateObject(addr)
	if stateObject != nil {
		stateObject.AddBalance(amount)
	}
}
func (self *StateDB) SubBalance(addr common.Address, amount *big.Int) {
	stateObject := self.GetOrNewStateObject(addr)
	if stateObject != nil {
		stateObject.SubBalance(amount)
	}
}
func (self *StateDB) SetBalance(addr common.Address, amount *big.Int) {
	stateObject := self.GetOrNewStateObject(addr)
	if stateObject != nil {
		stateObject.SetBalance(amount)
	}
}
func (self *StateDB) SetNonce(addr common.Address, nonce uint64) {
	stateObject := self.GetOrNewStateObject(addr)
	if stateObject != nil {
		stateObject.SetNonce(nonce)
	}
}
func (self *StateDB) SetCode(addr common.Address, code []byte) {
	stateObject := self.GetOrNewStateObject(addr)
	if stateObject != nil {
		stateObject.SetCode(crypto.Keccak256Hash(code), code)
	}
}
func (self *StateDB) SetState(addr common.Address, key, value common.Hash) {
	stateObject := self.GetOrNewStateObject(addr)
	if stateObject != nil {
		stateObject.SetState(self.db, key, value)
	}
}
func (self *StateDB) Suicide(addr common.Address) bool {
	stateObject := self.getStateObject(addr)
	if stateObject == nil {
		return false
	}
	self.journal.append(suicideChange{
		account:     &addr,
		prev:        stateObject.suicided,
		prevbalance: new(big.Int).Set(stateObject.Balance()),
	})
	stateObject.markSuicided()
	stateObject.data.Balance = new(big.Int)
	return true
}