#include <auto_init_metadata.h>

Inheritance diagram for RemoveMetadataInits:

Public Member Functions
	RemoveMetadataInits (const PhvInfo &phv, const FieldDefUse &defuse, std::set< cstring > &zeroInitFields)

bool	elim_extract (const IR::BFN::Unit unit, const IR::BFN::Extract extract) override
	Determines whether the given extract, occurring in the given unit, should be eliminated.

const IR::BFN::Pipe *	preorder (IR::BFN::Pipe *pipe) override

const IR::MAU::Instruction *	preorder (IR::MAU::Instruction *instr) override

Public Member Functions inherited from P4::Transform
const IR::Node *	apply_visitor (const IR::Node , const char name=0) override

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

virtual void	loop_revisit (const IR::Node *)

virtual const IR::Node *	postorder (IR::Node *n)

virtual const IR::Node *	preorder (IR::Node *n)

void	prune ()

virtual void	revisit (const IR::Node , const IR::Node )

void	revisit_visited ()

bool	visit_in_progress (const IR::Node *) const

void	visitAgain () const override

void	visitOnce () const override

Public Member Functions inherited from P4::Visitor
virtual bool	check_global (cstring)

virtual void	clear_globals ()

virtual Visitor *	clone () const

virtual ControlFlowVisitor *	controlFlowVisitor ()

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

virtual void	erase_global (cstring)

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 Visitor &	flow_clone ()

virtual void	flow_merge (Visitor &)

virtual bool	flow_merge_closure (Visitor &)

virtual void	flow_merge_global_from (cstring)

virtual void	flow_merge_global_to (cstring)

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 bool	has_flow_joins () const

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

template<class T>
bool	isInContext () const

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

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

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

Protected Member Functions inherited from AbstractElimUnusedInstructions
	AbstractElimUnusedInstructions (const FieldDefUse &defuse)

const IR::BFN::Extract *	preorder (IR::BFN::Extract *extract) override

const IR::BFN::FieldLVal *	preorder (IR::BFN::FieldLVal *lval) override

const IR::GlobalRef *	preorder (IR::GlobalRef *gr) override

const IR::MAU::StatefulAlu *	preorder (IR::MAU::StatefulAlu *salu) override

Protected Member Functions inherited from P4::Transform
const IR::Node *	transform_child (const IR::Node *child)

Protected Member Functions inherited from P4::Visitor
virtual void	init_join_flows (const IR::Node *)

virtual bool	join_flows (const IR::Node *)

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

void	visit_children (const IR::Node *, std::function< void()> fn)

Protected Attributes inherited from AbstractElimUnusedInstructions
const FieldDefUse &	defuse

std::set< cstring >	eliminated
	Names of fields whose extracts have been eliminated.

Protected Attributes inherited from P4::Transform
bool	forceClone = false

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

bool	joinFlows = false

bool	visitDagOnce = true

Detailed Description

Removes unnecessary metadata initializations. An assignment to a metadata field is deemed an unnecessary initialization if it satisfies all of the following:

The metadata field is not annotated with @pa_no_init.
The metadata field is initially valid (
See also
PHV::Field::is_invalidate_from_arch).
The constant 0 is assigned.
The assignment only overwrites ImplicitParserInit, according to def-use.

Member Function Documentation

◆ elim_extract()

bool RemoveMetadataInits::elim_extract	(	const IR::BFN::Unit *	unit,
		const IR::BFN::Extract *	extract )

overridevirtual

Determines whether the given extract, occurring in the given unit, should be eliminated.

Implements AbstractElimUnusedInstructions.

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ elim_extract()