P4::FrontEndPolicy Class Reference

#include <frontend.h>

Inheritance diagram for P4::FrontEndPolicy:

Public Member Functions
virtual bool	enableSubConstToAddTransform () const
virtual bool	foldInlinedFrom () const
virtual ConstantFoldingPolicy *	getConstantFoldingPolicy () const
virtual std::vector< DebugHook >	getDebugHooks () const
virtual ParseAnnotations *	getParseAnnotations () const
virtual bool	optimize (const CompilerOptions &options) const
virtual bool	removeOpAssign () const
virtual bool	skipSideEffectOrdering () const
Public Member Functions inherited from P4::RemoveUnusedPolicy
virtual RemoveUnusedDeclarations *	getRemoveUnusedDeclarationsPass (const UsedDeclSet &used, bool warn=false) const

Detailed Description

A customization point for frontend. The each tool can provide their own implementation of the policy that customizes its behaviour, or use instance of this class directly to provide the defaults.

Member Function Documentation

enableSubConstToAddTransform()

virtual bool P4::FrontEndPolicy::enableSubConstToAddTransform ( ) const

inlinevirtual

Indicates whether to enable the a - constant to a + (-constant) in StrengthReduction.

Returns

Defaults to true.

foldInlinedFrom()

virtual bool P4::FrontEndPolicy::foldInlinedFrom ( ) const

inlinevirtual

Indicates whether control flow should fold blocks marked with @inlinedFrom annotation

Returns

Defaults to true

getConstantFoldingPolicy()

virtual ConstantFoldingPolicy * P4::FrontEndPolicy::getConstantFoldingPolicy ( ) const

inlinevirtual

Get policy for the constant folding pass.

See also

ConstantFoldingPolicy

Returns

Defaults to nullptr, which causes constant folding to use the default policy, which does not modify the pass defaults in any way.

getDebugHooks()

virtual std::vector< DebugHook > P4::FrontEndPolicy::getDebugHooks ( ) const

inlinevirtual

Get a vector of debug hooks that will be added to frontend and all the pass managers it uses internally.

Returns

Defaults to no hooks.

getParseAnnotations()

virtual ParseAnnotations * P4::FrontEndPolicy::getParseAnnotations ( ) const

inlinevirtual

A specialized instance of annotations parser for the target, or nullptr to use the default configuration.

Returns

Defaults to nullptr.

Reimplemented in BFN::FrontEndPolicy.

optimize()

virtual bool P4::FrontEndPolicy::optimize ( const CompilerOptions & options ) const

inlinevirtual

Indicates whether the frontend should run some optimizations (inlining, action localization, etc.).

Returns

default to enabled optimizations unless -O0 was given in the options (i.e. enabled unless options.optimizationLevel == 0).

removeOpAssign()

virtual bool P4::FrontEndPolicy::removeOpAssign ( ) const

inlinevirtual

Indicates whether OpAssignmentExpressions should be expanded and replaced by simple assignments. This depends on SideEffectOrdering to be correct, so should probably be false if skipSideEffectOrdering is true.

skipSideEffectOrdering()

virtual bool P4::FrontEndPolicy::skipSideEffectOrdering ( ) const

inlinevirtual

Indicates whether the side-effect-ordering pass should be skipped.

Returns

Defaults to false.

Reimplemented in BFN::FrontEndPolicy.