Refactored state, state object and vm

* The State and StateObject have been moved to their own package
* The VM is moved to it's own package

ethstate/state_test.go

@@ -0,0 +1,35 @@
+package ethstate
+
+import (
+	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/ethtrie"
+	"github.com/ethereum/eth-go/ethutil"
+	"testing"
+)
+
+var ZeroHash256 = make([]byte, 32)
+
+func TestSnapshot(t *testing.T) {
+	db, _ := ethdb.NewMemDatabase()
+	ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
+	ethutil.Config.Db = db
+
+	state := NewState(ethtrie.NewTrie(db, ""))
+
+	stateObject := state.GetOrNewStateObject([]byte("aa"))
+
+	stateObject.SetStorage(ethutil.Big("0"), ethutil.NewValue(42))
+
+	snapshot := state.Copy()
+
+	stateObject = state.GetStateObject([]byte("aa"))
+	stateObject.SetStorage(ethutil.Big("0"), ethutil.NewValue(43))
+
+	state.Set(snapshot)
+
+	stateObject = state.GetStateObject([]byte("aa"))
+	res := stateObject.GetStorage(ethutil.Big("0"))
+	if !res.Cmp(ethutil.NewValue(42)) {
+		t.Error("Expected storage 0 to be 42", res)
+	}
+}