P4::SplitFlowVisit_base Class Reference

#include <visitor.h>

Inheritance diagram for P4::SplitFlowVisit_base:

Public Member Functions
virtual void	dbprint (std::ostream &) const =0
virtual void	do_visit ()=0
bool	finished ()
void	pause ()
virtual bool	ready ()
virtual void	run_visit ()
void	unpause ()

Protected Member Functions
	SplitFlowVisit_base (Visitor &v)
void *	operator new (size_t)

Protected Attributes
friend	ControlFlowVisitor
bool	paused = false
SplitFlowVisit_base *	prev
int	start_index = 0
Visitor &	v
int	visit_next = 0
std::vector< Visitor * >	visitors

Friends
void	dump (const SplitFlowVisit_base *split)

Detailed Description

SplitFlowVisit_base is base class for doing coroutine-like processing of of flows in a visitor. A visit_children method (or a preorder override) can instantiate a local SplitFlowVist subclass to record the various children that need to be visited, and the chain of currently in existence SplitFlowVisit objects will be recorded in split_link. When flows need to be joined (to visit a Dag node with mulitple parents), processing of the node can be 'paused' and other children from the SplitFlowVist can be visited, in order to visit all parents before the child is visited.