Inheritance diagram for P4::ControlFlowVisitor:

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Classes
struct	flow_join_info_t

class	GuardGlobal
	RAII class to ensure global key is only used in one place. More...

class	SaveGlobal
	RAII class to save and restore one or more global keys. More...

class	SetupJoinPoints

Public Member Functions
bool	check_global (cstring key) override

void	clear_globals () override

ControlFlowVisitor *	controlFlowVisitor () override

void	erase_global (cstring key) override

ControlFlowVisitor &	flow_clone () override

virtual void	flow_copy (ControlFlowVisitor &)=0

const flow_join_info_t *	flow_join_status (const IR::Node *n) const

void	flow_merge (Visitor &) override=0

void	flow_merge_global_from (cstring key) override

void	flow_merge_global_to (cstring key) override

bool	has_flow_joins () const override

bool	isUnreachable ()

bool	operator!= (const ControlFlowVisitor &v) const

virtual bool	operator== (const ControlFlowVisitor &) const

void	restore_global (std::pair< cstring, ControlFlowVisitor * > saved)

std::pair< cstring, ControlFlowVisitor * >	save_global (cstring key)

void	setUnreachable ()

Public Member Functions inherited from P4::Visitor
virtual const IR::Node *	apply_visitor (const IR::Node n, const char name=0)=0

virtual bool	check_clone (const Visitor *a)

virtual void	end_apply ()

virtual void	end_apply (const IR::Node *root)

template<class T>
const T *	findContext () const

template<class T>
const T *	findContext (const Context *&c) const

template<class T>
const T *	findOrigCtxt () const

template<class T>
const T *	findOrigCtxt (const Context *&c) const

virtual bool	flow_merge_closure (Visitor &)

const Context *	getChildContext () const

int	getChildrenVisited () const

const Context *	getContext () const

int	getContextDepth () const

const IR::Node *	getCurrentNode () const

template<class T>
const T *	getCurrentNode () const

const IR::Node *	getOriginal () const

template<class T>
const T *	getOriginal () const

template<class T>
const T *	getParent () const

virtual profile_t	init_apply (const IR::Node *root)

profile_t	init_apply (const IR::Node root, const Context parent_context)

bool	isInContext (const IR::Node *n) const

virtual const char *	name () const

template<class T>
void	parallel_visit (const IR::Vector< T > &v, const char *name, int cidx)

template<class T>
void	parallel_visit (const IR::Vector< T > &v, const char *name=0)

template<class T>
void	parallel_visit (IR::Vector< T > &v, const char *name, int cidx)

template<class T>
void	parallel_visit (IR::Vector< T > &v, const char *name=0)

void	print_context () const

const Visitor &	setCalledBy (const Visitor *visitor)

void	setName (const char *name)

void	visit (const IR::Node &n, const char *name, int cidx)

void	visit (const IR::Node &n, const char *name=0)

void	visit (const IR::Node &n, const char name, int cidx)

void	visit (const IR::Node &n, const char name=0)

void	visit (const IR::Node const &n, const char name, int cidx)

void	visit (const IR::Node const &n, const char name=0)

void	visit (IR::Node &n, const char *name, int cidx)

void	visit (IR::Node &n, const char *name=0)

void	visit (IR::Node &, const char =0, int=0)

template<class T, typename = std::enable_if_t<Util::has_SourceInfo_v<T> && !std::is_pointer_v<T>>, class... Args>
void	warn (const int kind, const char *format, const T &node, Args &&...args)
	The const ref variant of the above.

template<class T, typename = std::enable_if_t<Util::has_SourceInfo_v<T>>, class... Args>
void	warn (const int kind, const char format, const T node, Args &&...args)

bool	warning_enabled (int warning_kind) const

Protected Types
typedef std::map< const IR::Node *, flow_join_info_t >	flow_join_points_t

Protected Member Functions
virtual void	applySetupJoinPoints (const IR::Node *root)

ControlFlowVisitor *	clone () const override=0

virtual bool	filter_join_point (const IR::Node *)

void	init_join_flows (const IR::Node *root) override

bool	join_flows (const IR::Node *n) override

void	post_join_flows (const IR::Node , const IR::Node ) override

Protected Member Functions inherited from P4::Visitor
void	visit_children (const IR::Node *, std::function< void()> fn)

virtual void	visitAgain () const

virtual void	visitOnce () const

Protected Attributes
bool	BackwardsCompatibleBroken = false

flow_join_points_t *	flow_join_points = 0

bool	unreachable = false

Protected Attributes inherited from P4::Visitor
bool	dontForwardChildrenBeforePreorder = false

bool	joinFlows = false

bool	visitDagOnce = true

Friends
void	dump (const flow_join_info_t &info)

void	dump (const flow_join_info_t *info)

void	dump (const flow_join_points_t &fjp)

void	dump (const flow_join_points_t *fjp)

std::ostream &	operator<< (std::ostream &out, const flow_join_info_t &info)

std::ostream &	operator<< (std::ostream &out, const flow_join_points_t &fjp)

Additional Inherited Members
Public Types inherited from P4::Visitor
typedef Visitor_Context	Context

Static Public Member Functions inherited from P4::Visitor
static cstring	demangle (const char *)

static bool	warning_enabled (const Visitor *visitor, int warning_kind)

Public Attributes inherited from P4::Visitor
const Visitor *	called_by = nullptr

cstring	internalName

SplitFlowVisit_base *&	split_link

SplitFlowVisit_base *	split_link_mem = nullptr

Class Documentation

◆ P4::ControlFlowVisitor::flow_join_info_t

struct P4::ControlFlowVisitor::flow_join_info_t

Class Members
int	count = 0
bool	done = false
ControlFlowVisitor *	vclone = nullptr

Member Function Documentation

◆ check_global()

bool P4::ControlFlowVisitor::check_global ( cstring key )

inlineoverridevirtual

Reimplemented from P4::Visitor.

◆ clear_globals()

void P4::ControlFlowVisitor::clear_globals ( )

inlineoverridevirtual

Reimplemented from P4::Visitor.

◆ clone()

ControlFlowVisitor * P4::ControlFlowVisitor::clone ( ) const

overrideprotectedpure virtual

Reimplemented from P4::Visitor.

◆ controlFlowVisitor()

ControlFlowVisitor * P4::ControlFlowVisitor::controlFlowVisitor ( )

inlineoverridevirtual

Reimplemented from P4::Visitor.

◆ erase_global()

void P4::ControlFlowVisitor::erase_global ( cstring key )

inlineoverridevirtual

Reimplemented from P4::Visitor.

◆ filter_join_point()

virtual bool P4::ControlFlowVisitor::filter_join_point ( const IR::Node * )

inlineprotectedvirtual

This will be called for all nodes with multiple incoming edges, and should return 'false' if the node should be considered a join point, and 'true' if if should not be considered one. Nodes with only one incoming edge are never join points.

◆ flow_clone()

ControlFlowVisitor & P4::ControlFlowVisitor::flow_clone ( )

overridevirtual

Reimplemented from P4::Visitor.

◆ flow_merge()

void P4::ControlFlowVisitor::flow_merge ( Visitor & )

overridepure virtual

Merge the given visitor into this visitor at a joint point in the control flow graph. Should update @this and leave the other unchanged.

Reimplemented from P4::Visitor.

◆ flow_merge_global_from()

void P4::ControlFlowVisitor::flow_merge_global_from ( cstring key )

inlineoverridevirtual

Reimplemented from P4::Visitor.

◆ flow_merge_global_to()

void P4::ControlFlowVisitor::flow_merge_global_to ( cstring )

inlineoverridevirtual

Support methods for non-local ControlFlow computations

Reimplemented from P4::Visitor.

◆ has_flow_joins()

bool P4::ControlFlowVisitor::has_flow_joins ( ) const

inlineoverridevirtual

Reimplemented from P4::Visitor.

◆ init_join_flows()

void P4::ControlFlowVisitor::init_join_flows ( const IR::Node * root )

overrideprotectedvirtual

Reimplemented from P4::Visitor.

◆ join_flows()

bool P4::ControlFlowVisitor::join_flows ( const IR::Node * )

overrideprotectedvirtual

If
is a join point in the control flow graph (i.e. has multiple incoming edges) and is not filtered out by filter_join_point, then:

if this is the first time a visitor has visited
, store a clone of the visitor with this node and return true, deferring visiting this node until all incoming edges have been visited.
if this is NOT the first visitor, but also not the last, then merge this visitor into the stored visitor clone, and return true.
finally, if this is the is the final visitor, merge the stored, cloned visitor—which has accumulated all previous visitors—with this one, and return false.

join_flows(n) is invoked in apply_visitor(n, name), and
is only visited if this method returns false.

Returns: false if all upstream nodes from
have been visited, and it's time to visit
.

Reimplemented from P4::Visitor.

◆ post_join_flows()

void P4::ControlFlowVisitor::post_join_flows	(	const IR::Node *	,
		const IR::Node *	)

overrideprotectedvirtual

Called from apply_visitor after visiting the node (pre- and postorder) and its children after join_flows returned false

Reimplemented from P4::Visitor.

Classes

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Friends

Additional Inherited Members

Class Documentation

◆ P4::ControlFlowVisitor::flow_join_info_t

Member Function Documentation

◆ check_global()

◆ clear_globals()

◆ clone()

◆ controlFlowVisitor()

◆ erase_global()

◆ filter_join_point()

◆ flow_clone()

◆ flow_merge()

◆ flow_merge_global_from()

◆ flow_merge_global_to()

◆ has_flow_joins()

◆ init_join_flows()

◆ join_flows()

◆ post_join_flows()