Blocktest fixed, Execution fixed

* Added new CreateAccount method which properly overwrites previous
  accounts (excluding balance)
* Fixed block tests (100% success)

6 files changed, 70 insertions, 35 deletions

diff --git a/core/block_processor.go b/core/block_processor.go
index e970ad06e..8fbf760af 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -326,8 +326,12 @@ func (sm *BlockProcessor) AccumulateRewards(statedb *state.StateDB, block, paren
 			return ValidationError(fmt.Sprintf("%v", err))
 		}
 
+		num := new(big.Int).Add(big.NewInt(8), uncle.Number)
+		num.Sub(num, block.Number())
+
 		r := new(big.Int)
-		r.Mul(BlockReward, big.NewInt(15)).Div(r, big.NewInt(16))
+		r.Mul(BlockReward, num)
+		r.Div(r, big.NewInt(8))
 
 		statedb.AddBalance(uncle.Coinbase, r)
 
diff --git a/core/execution.go b/core/execution.go
index 24e085e6d..93fb03ecc 100644
--- a/core/execution.go
+++ b/core/execution.go
@@ -50,16 +50,29 @@ func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm.
 	}
 
 	vsnapshot := env.State().Copy()
+	var createAccount bool
 	if self.address == nil {
 		// Generate a new address
 		nonce := env.State().GetNonce(caller.Address())
-		addr := crypto.CreateAddress(caller.Address(), nonce)
 		env.State().SetNonce(caller.Address(), nonce+1)
+
+		addr := crypto.CreateAddress(caller.Address(), nonce)
+
 		self.address = &addr
+		createAccount = true
 	}
 	snapshot := env.State().Copy()
 
-	from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(*self.address)
+	var (
+		from = env.State().GetStateObject(caller.Address())
+		to   *state.StateObject
+	)
+	if createAccount {
+		to = env.State().CreateAccount(*self.address)
+	} else {
+		to = env.State().GetOrNewStateObject(*self.address)
+	}
+
 	err = env.Transfer(from, to, self.value)
 	if err != nil {
 		env.State().Set(vsnapshot)
diff --git a/core/genesis.go b/core/genesis.go
index 716298231..7958157a4 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -47,7 +47,7 @@ func GenesisBlock(db common.Database) *types.Block {
 	statedb := state.New(genesis.Root(), db)
 	for addr, account := range accounts {
 		codedAddr := common.Hex2Bytes(addr)
-		accountState := statedb.GetAccount(common.BytesToAddress(codedAddr))
+		accountState := statedb.CreateAccount(common.BytesToAddress(codedAddr))
 		accountState.SetBalance(common.Big(account.Balance))
 		accountState.SetCode(common.FromHex(account.Code))
 		statedb.UpdateStateObject(accountState)
diff --git a/core/state/statedb.go b/core/state/statedb.go
index 6fcd39dbc..2dc8239ef 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -57,6 +57,10 @@ func (self *StateDB) Refund(address common.Address, gas *big.Int) {
 	self.refund[addr].Add(self.refund[addr], gas)
 }
 
+/*
+ * GETTERS
+ */
+
 // Retrieve the balance from the given address or 0 if object not found
 func (self *StateDB) GetBalance(addr common.Address) *big.Int {
 	stateObject := self.GetStateObject(addr)
@@ -67,13 +71,6 @@ func (self *StateDB) GetBalance(addr common.Address) *big.Int {
 	return common.Big0
 }
 
-func (self *StateDB) AddBalance(addr common.Address, amount *big.Int) {
-	stateObject := self.GetStateObject(addr)
-	if stateObject != nil {
-		stateObject.AddBalance(amount)
-	}
-}
-
 func (self *StateDB) GetNonce(addr common.Address) uint64 {
 	stateObject := self.GetStateObject(addr)
 	if stateObject != nil {
@@ -101,22 +98,41 @@ func (self *StateDB) GetState(a common.Address, b common.Hash) []byte {
 	return nil
 }
 
-func (self *StateDB) SetNonce(addr common.Address, nonce uint64) {
+func (self *StateDB) IsDeleted(addr common.Address) bool {
 	stateObject := self.GetStateObject(addr)
 	if stateObject != nil {
+		return stateObject.remove
+	}
+	return false
+}
+
+/*
+ * SETTERS
+ */
+
+func (self *StateDB) AddBalance(addr common.Address, amount *big.Int) {
+	stateObject := self.GetOrNewStateObject(addr)
+	if stateObject != nil {
+		stateObject.AddBalance(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.GetStateObject(addr)
+	stateObject := self.GetOrNewStateObject(addr)
 	if stateObject != nil {
 		stateObject.SetCode(code)
 	}
 }
 
 func (self *StateDB) SetState(addr common.Address, key common.Hash, value interface{}) {
-	stateObject := self.GetStateObject(addr)
+	stateObject := self.GetOrNewStateObject(addr)
 	if stateObject != nil {
 		stateObject.SetState(key, common.NewValue(value))
 	}
@@ -134,14 +150,6 @@ func (self *StateDB) Delete(addr common.Address) bool {
 	return false
 }
 
-func (self *StateDB) IsDeleted(addr common.Address) bool {
-	stateObject := self.GetStateObject(addr)
-	if stateObject != nil {
-		return stateObject.remove
-	}
-	return false
-}
-
 //
 // Setting, updating & deleting state object methods
 //
@@ -194,16 +202,14 @@ func (self *StateDB) SetStateObject(object *StateObject) {
 func (self *StateDB) GetOrNewStateObject(addr common.Address) *StateObject {
 	stateObject := self.GetStateObject(addr)
 	if stateObject == nil {
-		stateObject = self.NewStateObject(addr)
+		stateObject = self.CreateAccount(addr)
 	}
 
 	return stateObject
 }
 
-// Create a state object whether it exist in the trie or not
-func (self *StateDB) NewStateObject(addr common.Address) *StateObject {
-	//addr = common.Address(addr)
-
+// NewStateObject create a state object whether it exist in the trie or not
+func (self *StateDB) newStateObject(addr common.Address) *StateObject {
 	statelogger.Debugf("(+) %x\n", addr)
 
 	stateObject := NewStateObject(addr, self.db)
@@ -212,9 +218,19 @@ func (self *StateDB) NewStateObject(addr common.Address) *StateObject {
 	return stateObject
 }
 
-// Deprecated
-func (self *StateDB) GetAccount(addr common.Address) *StateObject {
-	return self.GetOrNewStateObject(addr)
+// Creates creates a new state object and takes ownership. This is different from "NewStateObject"
+func (self *StateDB) CreateAccount(addr common.Address) *StateObject {
+	// Get previous (if any)
+	so := self.GetStateObject(addr)
+	// Create a new one
+	newSo := self.newStateObject(addr)
+
+	// If it existed set the balance to the new account
+	if so != nil {
+		newSo.balance = so.balance
+	}
+
+	return newSo
 }
 
 //
diff --git a/core/state_transition.go b/core/state_transition.go
index 10a49f829..7616686db 100644
--- a/core/state_transition.go
+++ b/core/state_transition.go
@@ -183,15 +183,16 @@ func (self *StateTransition) transitionState() (ret []byte, usedGas *big.Int, er
 	}
 
 	// Pay data gas
-	var dgas int64
+	dgas := new(big.Int)
 	for _, byt := range self.data {
 		if byt != 0 {
-			dgas += vm.GasTxDataNonzeroByte.Int64()
+			dgas.Add(dgas, vm.GasTxDataNonzeroByte)
 		} else {
-			dgas += vm.GasTxDataZeroByte.Int64()
+			dgas.Add(dgas, vm.GasTxDataZeroByte)
 		}
 	}
-	if err = self.UseGas(big.NewInt(dgas)); err != nil {
+
+	if err = self.UseGas(dgas); err != nil {
 		return nil, nil, InvalidTxError(err)
 	}
 
diff --git a/core/vm/vm.go b/core/vm/vm.go
index 6c3dd240a..59c64e8a3 100644
--- a/core/vm/vm.go
+++ b/core/vm/vm.go
@@ -857,7 +857,8 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
 			quadCoef = new(big.Int).Div(pow, GasQuadCoeffDenom)
 			newTotalFee := new(big.Int).Add(linCoef, quadCoef)
 
-			gas.Add(gas, new(big.Int).Sub(newTotalFee, oldTotalFee))
+			fee := new(big.Int).Sub(newTotalFee, oldTotalFee)
+			gas.Add(gas, fee)
 		}
 	}