core/state: track dirty state entries for each object

core/state/state_object.go

@@ -75,9 +75,11 @@ type StateObject struct {
 	dbErr error
 
 	// Write caches.
-	trie    *trie.SecureTrie // storage trie, which becomes non-nil on first access
-	code    Code             // contract bytecode, which gets set when code is loaded
-	storage Storage          // Cached storage (flushed when updated)
+	trie *trie.SecureTrie // storage trie, which becomes non-nil on first access
+	code Code             // contract bytecode, which gets set when code is loaded
+
+	cachedStorage Storage // Storage entry cache to avoid duplicate reads
+	dirtyStorage  Storage // Storage entries that need to be flushed to disk
 
 	// Cache flags.
 	// When an object is marked for deletion it will be delete from the trie
@@ -105,7 +107,7 @@ func NewObject(address common.Address, data Account, onDirty func(addr common.Ad
 	if data.CodeHash == nil {
 		data.CodeHash = emptyCodeHash
 	}
-	return &StateObject{address: address, data: data, storage: make(Storage), onDirty: onDirty}
+	return &StateObject{address: address, data: data, cachedStorage: make(Storage), dirtyStorage: make(Storage), onDirty: onDirty}
 }
 
 // EncodeRLP implements rlp.Encoder.
@@ -145,7 +147,7 @@ func (c *StateObject) getTrie(db trie.Database) *trie.SecureTrie {
 
 // GetState returns a value in account storage.
 func (self *StateObject) GetState(db trie.Database, key common.Hash) common.Hash {
-	value, exists := self.storage[key]
+	value, exists := self.cachedStorage[key]
 	if exists {
 		return value
 	}
@@ -155,14 +157,16 @@ func (self *StateObject) GetState(db trie.Database, key common.Hash) common.Hash
 	rlp.DecodeBytes(tr.Get(key[:]), &ret)
 	value = common.BytesToHash(ret)
 	if (value != common.Hash{}) {
-		self.storage[key] = value
+		self.cachedStorage[key] = value
 	}
 	return value
 }
 
 // SetState updates a value in account storage.
 func (self *StateObject) SetState(key, value common.Hash) {
-	self.storage[key] = value
+	self.cachedStorage[key] = value
+	self.dirtyStorage[key] = value
+
 	if self.onDirty != nil {
 		self.onDirty(self.Address())
 		self.onDirty = nil
@@ -172,7 +176,8 @@ func (self *StateObject) SetState(key, value common.Hash) {
 // updateTrie writes cached storage modifications into the object's storage trie.
 func (self *StateObject) updateTrie(db trie.Database) {
 	tr := self.getTrie(db)
-	for key, value := range self.storage {
+	for key, value := range self.dirtyStorage {
+		delete(self.dirtyStorage, key)
 		if (value == common.Hash{}) {
 			tr.Delete(key[:])
 			continue
@@ -241,7 +246,8 @@ func (self *StateObject) Copy(db trie.Database, onDirty func(addr common.Address
 	stateObject := NewObject(self.address, self.data, onDirty)
 	stateObject.trie = self.trie
 	stateObject.code = self.code
-	stateObject.storage = self.storage.Copy()
+	stateObject.dirtyStorage = self.dirtyStorage.Copy()
+	stateObject.cachedStorage = self.dirtyStorage.Copy()
 	stateObject.remove = self.remove
 	stateObject.dirtyCode = self.dirtyCode
 	stateObject.deleted = self.deleted
@@ -312,7 +318,7 @@ func (self *StateObject) Value() *big.Int {
 
 func (self *StateObject) ForEachStorage(cb func(key, value common.Hash) bool) {
 	// When iterating over the storage check the cache first
-	for h, value := range self.storage {
+	for h, value := range self.cachedStorage {
 		cb(h, value)
 	}
 
@@ -320,7 +326,7 @@ func (self *StateObject) ForEachStorage(cb func(key, value common.Hash) bool) {
 	for it.Next() {
 		// ignore cached values
 		key := common.BytesToHash(self.trie.GetKey(it.Key))
-		if _, ok := self.storage[key]; !ok {
+		if _, ok := self.cachedStorage[key]; !ok {
 			cb(key, common.BytesToHash(it.Value))
 		}
 	}

core/state/state_test.go

@@ -208,16 +208,16 @@ func compareStateObjects(so0, so1 *StateObject, t *testing.T) {
 		t.Fatalf("Code mismatch: have %v, want %v", so0.code, so1.code)
 	}
 
-	if len(so1.storage) != len(so0.storage) {
-		t.Errorf("Storage size mismatch: have %d, want %d", len(so1.storage), len(so0.storage))
+	if len(so1.cachedStorage) != len(so0.cachedStorage) {
+		t.Errorf("Storage size mismatch: have %d, want %d", len(so1.cachedStorage), len(so0.cachedStorage))
 	}
-	for k, v := range so1.storage {
-		if so0.storage[k] != v {
-			t.Errorf("Storage key %x mismatch: have %v, want %v", k, so0.storage[k], v)
+	for k, v := range so1.cachedStorage {
+		if so0.cachedStorage[k] != v {
+			t.Errorf("Storage key %x mismatch: have %v, want %v", k, so0.cachedStorage[k], v)
 		}
 	}
-	for k, v := range so0.storage {
-		if so1.storage[k] != v {
+	for k, v := range so0.cachedStorage {
+		if so1.cachedStorage[k] != v {
 			t.Errorf("Storage key %x mismatch: have %v, want none.", k, v)
 		}
 	}