#include <gateway_control_flow.h>

Inheritance diagram for BFN::GatewayControlFlow:

Public Member Functions
virtual void	pre_visit_table_next (const IR::MAU::Table *tbl, cstring tags)=0

Public Member Functions inherited from P4::ControlFlowVisitor
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 Member Functions
const IR::MAU::Table *	gateway_context (cstring &tag) const

const IR::MAU::Table *	gateway_context (int &idx) const

std::set< cstring >	gateway_earlier_tags () const

std::set< cstring >	gateway_later_tags () const

Protected Member Functions inherited from P4::ControlFlowVisitor
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

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 Types inherited from P4::ControlFlowVisitor
typedef std::map< const IR::Node *, flow_join_info_t >	flow_join_points_t

Protected Attributes inherited from P4::ControlFlowVisitor
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

Detailed Description

Mixin class for ControlFlowVisitor to allow better tracking of gateway dependent information A Visitor subclass may inherit from this (instead of directly from ControlFlowVisitor) in order to get better notification about visiting the gateway-dependent (or match-action dependent) next chains of a table. When visiting an IR::MAU::Table's children with a visitor that inherits from this mixin, the pre_visit_table_next method will be called just before visiting each next chain. This method can then update the visitor's internal info to propagate knowledge of the gateway tests. Any info can be computed here, or computed when visiting the gateway expressions (which will be before visiting all the next chains). This should be useful for any type of value inferencing where info about the values of any fields/metadata/headers/POV bits can be inferred from the gateway condition.

Member Function Documentation

◆ gateway_context()

const IR::MAU::Table * BFN::GatewayControlFlow::gateway_context ( int & idx ) const

protected

If we are currently visiting a gateway expression, gateway_context will return the containing table, and sets idx to the gateway expression index being visited or tag to the tag of the gateway expression, depending which overloaded function is called

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

SPDX-License-Identifier: Apache-2.0

◆ gateway_earlier_tags()

std::set< cstring > BFN::GatewayControlFlow::gateway_earlier_tags ( ) const

protected

If we are currently visiting a gateway expression, will return all the tags on gateway rows before or after the row we are currently visiting

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ gateway_context()

◆ gateway_earlier_tags()