Got past temporary variable deallocation bug. Now working on functions.

runtime/main.cpp

@@ -5,6 +5,24 @@
 */
 #include "runtime.h"
 
+struct subroutine *callStack=nullptr;
+
+subroutine::subroutine(enum STATES r)
+{
+	this->ret=r;
+	this->called=callStack;
+}
+
+enum STATES subroutine::close()
+{
+	if (callStack==nullptr) return STACK_UNDERFLOW_ERROR;
+	enum STATES r=callStack->ret;
+	struct subroutine *l=callStack->called;
+	delete callStack;
+	callStack=l;
+	return r;
+}
+
 int main(int argc, char *argv[])
 {
 	unsigned int ret=run();

runtime/runtime.h

@@ -14,9 +14,24 @@ enum STATES:unsigned int
 {
     EXIT,
     UNDEFINED_STATE_ERROR,
+    STACK_UNDERFLOW_ERROR,
     START
 };
 
+class subroutine
+{
+    struct subroutine *called;
+    enum STATES ret;
+
+public:
+    static enum STATES close();
+    subroutine(enum STATES r);
+    virtual ~subroutine()
+    {}
+};
+
+extern struct subroutine *callStack;
+
 /* function prototype */
 unsigned int run();