Package com.ibm.wala.dataflow.ssa

Class SSAInference<T extends IVariable<T>>

java.lang.Object

com.ibm.wala.fixedpoint.impl.AbstractFixedPointSolver<T>

com.ibm.wala.fixedpoint.impl.DefaultFixedPointSolver<T>

com.ibm.wala.dataflow.ssa.SSAInference<T>

All Implemented Interfaces:

FixedPointConstants, IFixedPointSolver<T>, VerboseAction

Direct Known Subclasses:

TypeInference

public abstract class SSAInference<T extends IVariable<T>>
extends DefaultFixedPointSolver<T>

This class performs intra-procedural propagation over an SSA form.

A client will subclass an SSAInference by providing factories that generate IVariables corresponding to SSA value numbers, and AbstractOperators corresponding to SSA instructions. This class will set up a dataflow system induced by the SSA def-use graph, and solve the system by iterating to a fixed point.

See Also:

• for the canonical client of this machinery.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	SSAInference.OperatorFactory<T extends IVariable<T>>
static interface	SSAInference.VariableFactory<T extends IVariable<T>>

Nested classes/interfaces inherited from class com.ibm.wala.fixedpoint.impl.AbstractFixedPointSolver

AbstractFixedPointSolver.Statement

Field Summary

Fields inherited from class com.ibm.wala.fixedpoint.impl.AbstractFixedPointSolver

DEFAULT_PERIODIC_MAINTENANCE_INTERVAL, DEFAULT_VERBOSE_INTERVAL, verbose, workList

Fields inherited from interface com.ibm.wala.fixpoint.FixedPointConstants

CHANGED, CHANGED_AND_FIXED, CHANGED_MASK, FIXED_MASK, NOT_CHANGED, NOT_CHANGED_AND_FIXED, SIDE_EFFECT_MASK

Constructor Summary

Constructors

Constructor	Description
SSAInference()

Method Summary

Modifier and Type	Method	Description
protected T	getVariable(int valueNumber)
protected void	init(IR ir, SSAInference.VariableFactory<T> varFactory, SSAInference.OperatorFactory<T> opFactory)	initializer for SSA Inference equations.
String	toString()	Return a string representation of the system

Methods inherited from class com.ibm.wala.fixedpoint.impl.DefaultFixedPointSolver

getFixedPointSystem

Methods inherited from class com.ibm.wala.fixedpoint.impl.AbstractFixedPointSolver

addAllStatementsToWorkList, addToWorkList, changedVariable, emptyWorkList, getMaxEvalBetweenTopo, getMinSizeForTopSort, getNumberOfEvaluations, getPeriodicMaintainInterval, getStatements, getTopologicalGrowthFactor, getVerboseInterval, incNumberOfEvaluations, initForFirstSolve, initializeVariables, initializeWorkList, isChanged, isFixed, isSideEffect, lineBreak, makeStmtRHS, newStatement, newStatement, newStatement, newStatement, newStatement, orderStatements, performVerboseAction, periodicMaintenance, removeStatement, setMaxEvalBetweenTopo, setMinEquationsForTopSort, setTopologicalGrowthFactor, solve

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

SSAInference

public SSAInference()

Method Details

init

protected void init(IR ir,
 SSAInference.VariableFactory<T> varFactory,
 SSAInference.OperatorFactory<T> opFactory)

initializer for SSA Inference equations.

getVariable

protected T getVariable(int valueNumber)

Returns:

the dataflow variable representing the value number, or null if none found.

toString

public String toString()

Return a string representation of the system

Overrides:

toString in class AbstractFixedPointSolver<T extends IVariable<T>>

Returns:

a string representation of the system