core, core/vm: added structure logging

This also reduces the time required spend in the VM

core/vm/environment.go

@@ -20,6 +20,8 @@ type Environment interface {
 	GasLimit() *big.Int
 	Transfer(from, to Account, amount *big.Int) error
 	AddLog(*state.Log)
+	AddStructLog(StructLog)
+	StructLogs() []StructLog
 
 	VmType() Type
 
@@ -31,6 +33,14 @@ type Environment interface {
 	Create(me ContextRef, data []byte, gas, price, value *big.Int) ([]byte, error, ContextRef)
 }
 
+type StructLog struct {
+	Pc     uint64
+	Op     OpCode
+	Gas    *big.Int
+	Memory []byte
+	Stack  []*big.Int
+}
+
 type Account interface {
 	SubBalance(amount *big.Int)
 	AddBalance(amount *big.Int)