com.oracle.graal.compiler.common.type

Class IllegalStamp

java.lang.Object

com.oracle.graal.compiler.common.type.Stamp

com.oracle.graal.compiler.common.type.IllegalStamp

public final class IllegalStamp
extends Stamp

This stamp represents the type of the Kind.Illegal value in the second slot of Kind.Long and Kind.Double values. It can only appear in framestates or virtual objects.

Field Summary

Fields

Modifier and Type	Field and Description
private static IllegalStamp	instance

Constructor Summary

Constructors

Modifier	Constructor and Description
private	IllegalStamp()

Method Summary

Modifier and Type	Method and Description
Stamp	constant(Constant c, MetaAccessProvider meta) If it is possible to represent single value stamps of this kind, this method returns the stamp representing the single value c.
Stamp	empty() Returns a stamp of the same kind, but with no allowed values.
(package private) static IllegalStamp	getInstance()
LIRKind	getLIRKind(LIRKindTool tool) Gets a platform dependent LIRKind that can be used to store a value of this stamp.
Kind	getStackKind() Gets a Java Kind that can be used to store a value of this stamp on the Java bytecode stack.
boolean	hasValues() Test whether this stamp has legal values.
Stamp	improveWith(Stamp other) Tries to improve this stamp with the stamp given as parameter.
boolean	isCompatible(Stamp stamp) Test whether two stamps have the same base type.
ResolvedJavaType	javaType(MetaAccessProvider metaAccess) Returns the type of the stamp, guaranteed to be non-null.
Stamp	join(Stamp other) Returns the intersection of this stamp and the given stamp.
Stamp	meet(Stamp other) Returns the union of this stamp and the given stamp.
Constant	readConstant(MemoryAccessProvider provider, Constant base, long displacement) Read a value of this stamp from memory.
String	toString()
Stamp	unrestricted() Returns a stamp of the same kind, but allowing the full value range of the kind.

Methods inherited from class com.oracle.graal.compiler.common.type.Stamp

alwaysDistinct, asConstant, isEmpty, neverDistinct, tryImproveWith

Methods inherited from class java.lang.Object

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

Field Detail

instance

private static final IllegalStamp instance

Constructor Detail

IllegalStamp

private IllegalStamp()

Method Detail

getStackKind

public Kind getStackKind()

Description copied from class: Stamp

Gets a Java Kind that can be used to store a value of this stamp on the Java bytecode stack. Returns Kind.Illegal if a value of this stamp can not be stored on the bytecode stack.

Specified by:

getStackKind in class Stamp

getLIRKind

public LIRKind getLIRKind(LIRKindTool tool)

Description copied from class: Stamp

Gets a platform dependent LIRKind that can be used to store a value of this stamp.

Specified by:

getLIRKind in class Stamp

unrestricted

public Stamp unrestricted()

Description copied from class: Stamp

Returns a stamp of the same kind, but allowing the full value range of the kind. Stamp.unrestricted() is the neutral element of the Stamp.join(Stamp) operation.

Specified by:

unrestricted in class Stamp

empty

public Stamp empty()

Description copied from class: Stamp

Returns a stamp of the same kind, but with no allowed values. Stamp.empty() is the neutral element of the Stamp.meet(Stamp) operation.

Specified by:

empty in class Stamp

constant

public Stamp constant(Constant c,
                      MetaAccessProvider meta)

Description copied from class: Stamp

If it is possible to represent single value stamps of this kind, this method returns the stamp representing the single value c. stamp.constant(c).asConstant() should be equal to c.

If it is not possible to represent single value stamps, this method returns a stamp that includes c, and is otherwise as narrow as possible.

Specified by:

constant in class Stamp

javaType

public ResolvedJavaType javaType(MetaAccessProvider metaAccess)

Description copied from class: Stamp

Returns the type of the stamp, guaranteed to be non-null. In some cases, this requires the lookup of class meta data, therefore the MetaAccessProvider is mandatory.

Specified by:

javaType in class Stamp

meet

public Stamp meet(Stamp other)

Description copied from class: Stamp

Returns the union of this stamp and the given stamp. Typically used to create stamps for phi nodes.

Specified by:

meet in class Stamp

Parameters:

other - The stamp that will enlarge this stamp.

Returns:

The union of this stamp and the given stamp.

join

public Stamp join(Stamp other)

Description copied from class: Stamp

Returns the intersection of this stamp and the given stamp.

Specified by:

join in class Stamp

Parameters:

other - The stamp that will tighten this stamp.

Returns:

The intersection of this stamp and the given stamp.

isCompatible

public boolean isCompatible(Stamp stamp)

Description copied from class: Stamp

Test whether two stamps have the same base type.

Specified by:

isCompatible in class Stamp

toString

public String toString()

Overrides:

toString in class Object

hasValues

public boolean hasValues()

Description copied from class: Stamp

Test whether this stamp has legal values.

Specified by:

hasValues in class Stamp

improveWith

public Stamp improveWith(Stamp other)

Description copied from class: Stamp

Tries to improve this stamp with the stamp given as parameter. If successful, returns the new improved stamp. Otherwise, returns a stamp equal to this.

Specified by:

improveWith in class Stamp

Parameters:

other - the stamp that should be used to improve this stamp

Returns:

the newly improved stamp or a stamp equal to this if an improvement was not possible

readConstant

public Constant readConstant(MemoryAccessProvider provider,
                             Constant base,
                             long displacement)

Description copied from class: Stamp

Read a value of this stamp from memory.

Specified by:

readConstant in class Stamp

getInstance

static IllegalStamp getInstance()