de.uka.ilkd.key.rule.join.procedures

Class JoinWeaken

java.lang.Object

de.uka.ilkd.key.rule.join.JoinProcedure

de.uka.ilkd.key.rule.join.procedures.JoinWeaken

public class JoinWeaken
extends JoinProcedure

Rule that joins two sequents based on "total" weakening: Replacement of symbolic state by an update setting every program variable to a fresh Skolem constant, if the respective program variable does not evaluate to the same value in both states - in this case, the original value is preserved (-> idempotency).

Author:

Dominic Scheurer

Field Summary

Fields

Modifier and Type	Field and Description
private static String	DISPLAY_NAME
private static JoinWeaken	INSTANCE

Constructor Summary

Constructors

Constructor and Description
JoinWeaken()

Method Summary

Modifier and Type	Method and Description
static JoinWeaken	instance()
Triple<ImmutableSet<Term>,Term,ImmutableSet<Name>>	joinValuesInStates(Term v, SymbolicExecutionState state1, Term valueInState1, SymbolicExecutionState state2, Term valueInState2, Term distinguishingFormula, Services services) Joins two values valueInState1 and valueInState2 of corresponding SE states state1 and state2 to a new value of a join state.
boolean	requiresDistinguishablePathConditions()
String	toString()

Methods inherited from class de.uka.ilkd.key.rule.join.JoinProcedure

getJoinProcedures, getProcedureByName

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

private static JoinWeaken INSTANCE

DISPLAY_NAME

private static final String DISPLAY_NAME

See Also:

Constant Field Values

Constructor Detail

JoinWeaken

public JoinWeaken()

Method Detail

instance

public static JoinWeaken instance()

joinValuesInStates

public Triple<ImmutableSet<Term>,Term,ImmutableSet<Name>> joinValuesInStates(Term v,
                                                                             SymbolicExecutionState state1,
                                                                             Term valueInState1,
                                                                             SymbolicExecutionState state2,
                                                                             Term valueInState2,
                                                                             Term distinguishingFormula,
                                                                             Services services)

Description copied from class: JoinProcedure

Joins two values valueInState1 and valueInState2 of corresponding SE states state1 and state2 to a new value of a join state.

Specified by:

joinValuesInStates in class JoinProcedure

Parameters:

v - The variable for which the values should be joined

state1 - First SE state.

valueInState1 - Value in state1.

state2 - Second SE state.

valueInState2 - Value in state2.

distinguishingFormula - The user-specified distinguishing formula. May be null (for automatic generation).

services - The services object.

Returns:

A joined value for valueInState1 and valueInState2, that is a triple consisting of new constraints, the actual value and new names introduced.

requiresDistinguishablePathConditions

public boolean requiresDistinguishablePathConditions()

Specified by:

requiresDistinguishablePathConditions in class JoinProcedure

Returns:

true iff the join procedure requires distinguishable path conditions. This is usually the case for procedures working with concrete values of input states, and can be false for abstraction methods.

toString

public String toString()

Overrides:

toString in class Object