Base class for dense forward data-flow analyses. More...

#include "mlir/Analysis/DataFlow/DenseAnalysis.h"

Inheritance diagram for mlir::dataflow::AbstractDenseForwardDataFlowAnalysis:

Public Member Functions
LogicalResult	initialize (Operation *top) override
	Initialize the analysis by visiting every program point whose execution may modify the program state; that is, every operation and block. More...

LogicalResult	visit (ProgramPoint point) override
	Visit a program point that modifies the state of the program. More...

	DataFlowAnalysis (DataFlowSolver &solver)
	Create an analysis with a reference to the parent solver. More...

Public Member Functions inherited from mlir::DataFlowAnalysis
virtual	~DataFlowAnalysis ()

	DataFlowAnalysis (DataFlowSolver &solver)
	Create an analysis with a reference to the parent solver. More...

Protected Member Functions
virtual LogicalResult	visitOperationImpl (Operation op, const AbstractDenseLattice &before, AbstractDenseLattice after)=0
	Propagate the dense lattice before the execution of an operation to the lattice after its execution. More...

virtual AbstractDenseLattice *	getLattice (LatticeAnchor anchor)=0
	Get the dense lattice after the execution of the given lattice anchor. More...

const AbstractDenseLattice *	getLatticeFor (ProgramPoint dependent, LatticeAnchor anchor)
	Get the dense lattice after the execution of the given program point and add it as a dependency to a lattice anchor. More...

virtual void	setToEntryState (AbstractDenseLattice *lattice)=0
	Set the dense lattice at control flow entry point and propagate an update if it changed. More...

void	join (AbstractDenseLattice *lhs, const AbstractDenseLattice &rhs)
	Join a lattice with another and propagate an update if it changed. More...

virtual LogicalResult	processOperation (Operation *op)
	Visit an operation. More...

virtual void	visitRegionBranchControlFlowTransfer (RegionBranchOpInterface branch, std::optional< unsigned > regionFrom, std::optional< unsigned > regionTo, const AbstractDenseLattice &before, AbstractDenseLattice *after)
	Propagate the dense lattice forward along the control flow edge from `regionFrom` to `regionTo` regions of the `branch` operation. More...

virtual void	visitCallControlFlowTransfer (CallOpInterface call, CallControlFlowAction action, const AbstractDenseLattice &before, AbstractDenseLattice *after)
	Propagate the dense lattice forward along the call control flow edge, which can be either entering or exiting the callee. More...

void	visitRegionBranchOperation (ProgramPoint point, RegionBranchOpInterface branch, AbstractDenseLattice *after)
	Visit a program point within a region branch operation with predecessors in it. More...

Protected Member Functions inherited from mlir::DataFlowAnalysis
void	addDependency (AnalysisState *state, ProgramPoint point)
	Create a dependency between the given analysis state and lattice anchor on this analysis. More...

void	propagateIfChanged (AnalysisState *state, ChangeResult changed)
	Propagate an update to a state if it changed. More...

template<typename AnchorT >
void	registerAnchorKind ()
	Register a custom lattice anchor class. More...

template<typename AnchorT , typename... Args>
AnchorT *	getLatticeAnchor (Args &&...args)
	Get or create a custom lattice anchor. More...

template<typename StateT , typename AnchorT >
StateT *	getOrCreate (AnchorT anchor)
	Get the analysis state associated with the lattice anchor. More...

template<typename StateT , typename AnchorT >
const StateT *	getOrCreateFor (ProgramPoint dependent, AnchorT anchor)
	Get a read-only analysis state for the given point and create a dependency on `dependent`. More...

const DataFlowConfig &	getSolverConfig () const
	Return the configuration of the solver used for this analysis. More...

Detailed Description

Base class for dense forward data-flow analyses.

Dense data-flow analysis attaches a lattice between the execution of operations and implements a transfer function from the lattice before each operation to the lattice after. The lattice contains information about the state of the program at that point.

In this implementation, a lattice attached to an operation represents the state of the program after its execution, and a lattice attached to block represents the state of the program right before it starts executing its body.

Definition at line 71 of file DenseAnalysis.h.

Member Function Documentation

◆ DataFlowAnalysis()

DataFlowAnalysis::DataFlowAnalysis

explicit

Create an analysis with a reference to the parent solver.

Definition at line 420 of file DataFlowFramework.cpp.

◆ getLattice()

virtual AbstractDenseLattice* mlir::dataflow::AbstractDenseForwardDataFlowAnalysis::getLattice ( LatticeAnchor anchor )

protectedpure virtual

Get the dense lattice after the execution of the given lattice anchor.

Implemented in mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >.

◆ getLatticeFor()

const AbstractDenseLattice * AbstractDenseForwardDataFlowAnalysis::getLatticeFor	(	ProgramPoint	dependent,
		LatticeAnchor	anchor
	)

protected

Get the dense lattice after the execution of the given program point and add it as a dependency to a lattice anchor.

That is, every time the lattice after anchor is updated, the dependent program point must be visited, and the newly triggered visit might update the lattice after dependent.

Definition at line 247 of file DenseAnalysis.cpp.

◆ initialize()

LogicalResult AbstractDenseForwardDataFlowAnalysis::initialize ( Operation * top )

overridevirtual

Initialize the analysis by visiting every program point whose execution may modify the program state; that is, every operation and block.

Implements mlir::DataFlowAnalysis.

Definition at line 31 of file DenseAnalysis.cpp.

References mlir::Operation::getRegions(), and processOperation().

◆ join()

void mlir::dataflow::AbstractDenseForwardDataFlowAnalysis::join	(	AbstractDenseLattice *	lhs,
		const AbstractDenseLattice &	rhs
	)

inlineprotected

Join a lattice with another and propagate an update if it changed.

Definition at line 110 of file DenseAnalysis.h.

References mlir::dataflow::AbstractDenseLattice::join(), and mlir::DataFlowAnalysis::propagateIfChanged().

Referenced by visitCallControlFlowTransfer(), and visitRegionBranchControlFlowTransfer().

◆ processOperation()

LogicalResult AbstractDenseForwardDataFlowAnalysis::processOperation ( Operation * op )

protectedvirtual

Visit an operation.

If this is a call operation or region control-flow operation, then the state after the execution of the operation is set by control-flow or the callgraph. Otherwise, this function invokes the operation transfer function.

Definition at line 97 of file DenseAnalysis.cpp.

Referenced by initialize().

◆ setToEntryState()

virtual void mlir::dataflow::AbstractDenseForwardDataFlowAnalysis::setToEntryState ( AbstractDenseLattice * lattice )

protectedpure virtual

Set the dense lattice at control flow entry point and propagate an update if it changed.

Implemented in mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >.

Referenced by visitCallControlFlowTransfer().

◆ visit()

LogicalResult AbstractDenseForwardDataFlowAnalysis::visit ( ProgramPoint point )

overridevirtual

Visit a program point that modifies the state of the program.

If this is a block, then the state is propagated from control-flow predecessors or callsites. If this is a call operation or region control-flow operation, then the state after the execution of the operation is set by control-flow or the callgraph. Otherwise, this function invokes the operation transfer function.

Implements mlir::DataFlowAnalysis.

Definition at line 47 of file DenseAnalysis.cpp.

◆ visitCallControlFlowTransfer()

virtual void mlir::dataflow::AbstractDenseForwardDataFlowAnalysis::visitCallControlFlowTransfer	(	CallOpInterface	call,
		CallControlFlowAction	action,
		const AbstractDenseLattice &	before,
		AbstractDenseLattice *	after
	)

inlineprotectedvirtual

Propagate the dense lattice forward along the call control flow edge, which can be either entering or exiting the callee.

Default implementation for enter and exit callee actions just meets the states, meaning that operations implementing CallOpInterface don't have any effect on the lattice that isn't already expressed by the interface itself. Default implementation for the external callee action additionally sets the "after" lattice to the entry state.

Reimplemented in mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >.

Definition at line 141 of file DenseAnalysis.h.

References mlir::dataflow::ExternalCallee, join(), and setToEntryState().

Referenced by mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >::visitCallControlFlowTransfer().

◆ visitOperationImpl()

virtual LogicalResult mlir::dataflow::AbstractDenseForwardDataFlowAnalysis::visitOperationImpl	(	Operation *	op,
		const AbstractDenseLattice &	before,
		AbstractDenseLattice *	after
	)

protectedpure virtual

Propagate the dense lattice before the execution of an operation to the lattice after its execution.

Implemented in mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >.

◆ visitRegionBranchControlFlowTransfer()

virtual void mlir::dataflow::AbstractDenseForwardDataFlowAnalysis::visitRegionBranchControlFlowTransfer	(	RegionBranchOpInterface	branch,
		std::optional< unsigned >	regionFrom,
		std::optional< unsigned >	regionTo,
		const AbstractDenseLattice &	before,
		AbstractDenseLattice *	after
	)

inlineprotectedvirtual

Propagate the dense lattice forward along the control flow edge from regionFrom to regionTo regions of the branch operation.

nullopt values correspond to control flow branches originating at or targeting the branch operation itself. Default implementation just joins the states, meaning that operations implementing RegionBranchOpInterface don't have any effect on the lattice that isn't already expressed by the interface itself.

Reimplemented in mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >.

Definition at line 127 of file DenseAnalysis.h.

References join().

Referenced by mlir::dataflow::DenseForwardDataFlowAnalysis< LatticeT >::visitRegionBranchControlFlowTransfer().

◆ visitRegionBranchOperation()

void AbstractDenseForwardDataFlowAnalysis::visitRegionBranchOperation	(	ProgramPoint	point,
		RegionBranchOpInterface	branch,
		AbstractDenseLattice *	after
	)

protected

Visit a program point within a region branch operation with predecessors in it.

This can either be an entry block of one of the regions of the parent operation itself.

Definition at line 189 of file DenseAnalysis.cpp.

The documentation for this class was generated from the following files:

include/mlir/Analysis/DataFlow/DenseAnalysis.h
lib/Analysis/DataFlow/DenseAnalysis.cpp

Public Member Functions

Protected Member Functions

Detailed Description

Member Function Documentation

◆ DataFlowAnalysis()

◆ getLattice()

◆ getLatticeFor()

◆ initialize()

◆ join()

◆ processOperation()

◆ setToEntryState()

◆ visit()

◆ visitCallControlFlowTransfer()

◆ visitOperationImpl()

◆ visitRegionBranchControlFlowTransfer()

◆ visitRegionBranchOperation()