jif.types.label

Class VarLabel_c

java.lang.Object

polyglot.types.TypeObject_c

jif.types.Param_c

jif.types.label.Label_c

jif.types.label.VarLabel_c

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ActsForParam, Label, Variable, VarLabel, Param, polyglot.types.TypeObject, polyglot.util.Copy<polyglot.types.TypeObject>

public class VarLabel_c
extends Label_c
implements VarLabel

An implementation of the VarLabel interface.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface polyglot.util.Copy

polyglot.util.Copy.Util

Field Summary

Fields inherited from class jif.types.label.Label_c

description, toJava, variables

Fields inherited from class polyglot.types.TypeObject_c

position, ts

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	VarLabel_c()
	VarLabel_c(java.lang.String name, java.lang.String description, JifTypeSystem ts, polyglot.util.Position pos)

Method Summary

Modifier and Type	Method and Description
java.lang.String	componentString(java.util.Set<Label> printedLabels) return a string s such that {s} is a label
boolean	equalsImpl(polyglot.types.TypeObject o)
int	hashCode()
boolean	isCanonical()
boolean	isComparable() Is this label comparable to other labels?
boolean	isCovariant() Is this label covariant?
boolean	isDisambiguatedImpl() Check if the label is disambiguated, without recursing into child labels.
boolean	isEnumerable() Are the components of this label enumerable?
boolean	isRuntimeRepresentable()
boolean	leq_(Label L, LabelEnv env, LabelEnv.SearchState state) Implementation of leq, should only be called by JifTypeSystem
boolean	mustRuntimeRepresentable() Does this var label need to map to a runtime representable label?
java.lang.String	name()
void	setMustRuntimeRepresentable() Set the mustRuntimeRepresentable flag, meaning that any solution for this VarLabel must be to a runtime representable label.
java.util.Set<Variable>	variableComponents() The set of variables that this label contains as components.
java.util.Set<Variable>	variables() The set of variables that this label contains including variables contained in upper bounds of arg labels.

Methods inherited from class jif.types.label.Label_c

componentString, confProjection, copy, description, hasVariableComponents, hasVariables, hasWritersToReaders, integProjection, isBottom, isDisambiguated, isInvariant, isTop, labelCheck, normalize, setDescription, simplify, simplifyImpl, subst, throwTypes, toJava, toJava, toString, toString

Methods inherited from class jif.types.Param_c

typeSystem

Methods inherited from class polyglot.types.TypeObject_c

equals, position

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface jif.types.label.Label

componentString, confProjection, copy, description, hasVariableComponents, hasVariables, hasWritersToReaders, integProjection, isBottom, isDisambiguated, isInvariant, isTop, labelCheck, normalize, setDescription, simplify, subst, throwTypes, toJava, toString, toString

Methods inherited from interface jif.types.ActsForParam

toJava

Methods inherited from interface jif.types.Param

typeSystem

Methods inherited from interface polyglot.types.TypeObject

position

Constructor Detail

VarLabel_c

protected VarLabel_c()

VarLabel_c

public VarLabel_c(java.lang.String name,
                  java.lang.String description,
                  JifTypeSystem ts,
                  polyglot.util.Position pos)

Method Detail

isEnumerable

public boolean isEnumerable()

Description copied from interface: Label

Are the components of this label enumerable?

For example, Singletons are enumerable, JoinLabels are enumerable, RuntimeLabel (the label of all runtime representable components) is not enumerable. NOTE: The components of a label are not neccessarily stuck together with a join operation. For example, the MeetLabel uses the meet operation between its components.

Specified by:

isEnumerable in interface Label

isComparable

public boolean isComparable()

Description copied from interface: Label

Is this label comparable to other labels?

For example, an UnknownLabel is not comparable to others, neither is a VarLabel. Most other labels are.

Specified by:

isComparable in interface Label

isCanonical

public boolean isCanonical()

Specified by:

isCanonical in interface Param

Specified by:

isCanonical in interface polyglot.types.TypeObject

isDisambiguatedImpl

public boolean isDisambiguatedImpl()

Description copied from class: Label_c

Check if the label is disambiguated, without recursing into child labels.

Specified by:

isDisambiguatedImpl in class Label_c

isRuntimeRepresentable

public boolean isRuntimeRepresentable()

Specified by:

isRuntimeRepresentable in interface Label

Specified by:

isRuntimeRepresentable in interface Param

isCovariant

public boolean isCovariant()

Description copied from interface: Label

Is this label covariant?

Specified by:

isCovariant in interface Label

setMustRuntimeRepresentable

public void setMustRuntimeRepresentable()

Description copied from interface: Variable

Set the mustRuntimeRepresentable flag, meaning that any solution for this VarLabel must be to a runtime representable label.

Specified by:

setMustRuntimeRepresentable in interface Variable

mustRuntimeRepresentable

public boolean mustRuntimeRepresentable()

Description copied from interface: Variable

Does this var label need to map to a runtime representable label?

Specified by:

mustRuntimeRepresentable in interface Variable

componentString

public java.lang.String componentString(java.util.Set<Label> printedLabels)

Description copied from interface: Label

return a string s such that {s} is a label

Specified by:

componentString in interface Label

Specified by:

componentString in class Label_c

Parameters:

printedLabels - the set of labels for which auxiliary information should be omitted.

equalsImpl

public boolean equalsImpl(polyglot.types.TypeObject o)

Specified by:

equalsImpl in interface polyglot.types.TypeObject

Specified by:

equalsImpl in class Label_c

hashCode

public int hashCode()

Overrides:

hashCode in class polyglot.types.TypeObject_c

leq_

public boolean leq_(Label L,
                    LabelEnv env,
                    LabelEnv.SearchState state)

Description copied from interface: Label

Implementation of leq, should only be called by JifTypeSystem

Specified by:

leq_ in interface Label

Parameters:

L - the label to determine if this label is leq to. This label always satisfies !this.equals(L)

env - the label environment (including principal hierarchy). Will always be non-null.

variableComponents

public java.util.Set<Variable> variableComponents()

Description copied from interface: Label

The set of variables that this label contains as components. This is a subset of variables(), since it does not count var labels contained in upper bounds of arg labels.

Specified by:

variableComponents in interface Label

Overrides:

variableComponents in class Label_c

variables

public java.util.Set<Variable> variables()

Description copied from interface: Label

The set of variables that this label contains including variables contained in upper bounds of arg labels.

Specified by:

variables in interface Label

Overrides:

variables in class Label_c

name

public java.lang.String name()

Specified by:

name in interface Variable