Use the state instead of the state object directly.

If a state gets reset and you still hold a pointer to the previous,
incorrect, state object you'll operate on the wrong object. Using the
state to set/get objects and attributes you won't have this problem
since the state will always have the correct object.

ethstate/state.go

@@ -48,6 +48,13 @@ func (self *State) GetNonce(addr []byte) uint64 {
 	return 0
 }
 
+func (self *State) SetNonce(addr []byte, nonce uint64) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.Nonce = nonce
+	}
+}
+
 func (self *State) GetCode(addr []byte) []byte {
 	stateObject := self.GetStateObject(addr)
 	if stateObject != nil {
@@ -66,6 +73,24 @@ func (self *State) GetState(a, b []byte) []byte {
 	return nil
 }
 
+func (self *State) SetState(addr, key []byte, value interface{}) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.SetState(key, ethutil.NewValue(value))
+	}
+}
+
+func (self *State) Delete(addr []byte) bool {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.MarkForDeletion()
+
+		return true
+	}
+
+	return false
+}
+
 //
 // Setting, updating & deleting state object methods
 //