core, core/state: only write necessary state. Skip intermediate

core/block_processor.go

@@ -243,7 +243,7 @@ func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs st
 
 	// Commit state objects/accounts to a temporary trie (does not save)
 	// used to calculate the state root.
-	state.Update()
+	state.CleanUpdate()
 	if header.Root != state.Root() {
 		err = fmt.Errorf("invalid merkle root. received=%x got=%x", header.Root, state.Root())
 		return

core/state/state_object.go

@@ -57,8 +57,6 @@ type StateObject struct {
 	initCode Code
 	// Cached storage (flushed when updated)
 	storage Storage
-	// Temporary prepaid gas, reward after transition
-	prepaid *big.Int
 
 	// Total gas pool is the total amount of gas currently
 	// left if this object is the coinbase. Gas is directly
@@ -77,14 +75,10 @@ func (self *StateObject) Reset() {
 }
 
 func NewStateObject(address common.Address, db common.Database) *StateObject {
-	// This to ensure that it has 20 bytes (and not 0 bytes), thus left or right pad doesn't matter.
-	//address := common.ToAddress(addr)
-
 	object := &StateObject{db: db, address: address, balance: new(big.Int), gasPool: new(big.Int), dirty: true}
 	object.trie = trie.NewSecure((common.Hash{}).Bytes(), db)
 	object.storage = make(Storage)
 	object.gasPool = new(big.Int)
-	object.prepaid = new(big.Int)
 
 	return object
 }
@@ -110,7 +104,6 @@ func NewStateObjectFromBytes(address common.Address, data []byte, db common.Data
 	object.trie = trie.NewSecure(extobject.Root[:], db)
 	object.storage = make(map[string]common.Hash)
 	object.gasPool = new(big.Int)
-	object.prepaid = new(big.Int)
 	object.code, _ = db.Get(extobject.CodeHash)
 
 	return object
@@ -172,7 +165,6 @@ func (self *StateObject) Update() {
 
 		self.setAddr([]byte(key), value)
 	}
-	self.storage = make(Storage)
 }
 
 func (c *StateObject) GetInstr(pc *big.Int) *common.Value {

core/state/statedb.go

@@ -18,6 +18,7 @@ import (
 type StateDB struct {
 	db   common.Database
 	trie *trie.SecureTrie
+	root common.Hash
 
 	stateObjects map[string]*StateObject
 
@@ -31,7 +32,7 @@ type StateDB struct {
 // Create a new state from a given trie
 func New(root common.Hash, db common.Database) *StateDB {
 	trie := trie.NewSecure(root[:], db)
-	return &StateDB{db: db, trie: trie, stateObjects: make(map[string]*StateObject), refund: new(big.Int), logs: make(map[common.Hash]Logs)}
+	return &StateDB{root: root, db: db, trie: trie, stateObjects: make(map[string]*StateObject), refund: new(big.Int), logs: make(map[common.Hash]Logs)}
 }
 
 func (self *StateDB) PrintRoot() {
@@ -185,7 +186,7 @@ func (self *StateDB) DeleteStateObject(stateObject *StateObject) {
 	addr := stateObject.Address()
 	self.trie.Delete(addr[:])
 
-	delete(self.stateObjects, addr.Str())
+	//delete(self.stateObjects, addr.Str())
 }
 
 // Retrieve a state object given my the address. Nil if not found
@@ -340,6 +341,23 @@ func (self *StateDB) Update() {
 	}
 }
 
+func (self *StateDB) CleanUpdate() {
+	self.trie = trie.NewSecure(self.root[:], self.db)
+
+	self.refund = new(big.Int)
+
+	for _, stateObject := range self.stateObjects {
+		if stateObject.remove {
+			self.DeleteStateObject(stateObject)
+		} else {
+			stateObject.Update()
+
+			self.UpdateStateObject(stateObject)
+		}
+		stateObject.dirty = false
+	}
+}
+
 // Debug stuff
 func (self *StateDB) CreateOutputForDiff() {
 	for _, stateObject := range self.stateObjects {