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org.jikesrvm.compilers.opt.ir.operand
Class NullConstantOperand

java.lang.Object
  extended by org.jikesrvm.compilers.opt.ir.operand.Operand
      extended by org.jikesrvm.compilers.opt.ir.operand.ConstantOperand
          extended by org.jikesrvm.compilers.opt.ir.operand.NullConstantOperand

public final class NullConstantOperand
extends ConstantOperand

This operand represents the null constant.

See Also:
Operand

Field Summary
 
Fields inherited from class org.jikesrvm.compilers.opt.ir.operand.Operand
instruction
 
Constructor Summary
NullConstantOperand()
           
 
Method Summary
 Operand copy()
          Return a new operand that is semantically equivalent to this.
 TypeReference getType()
          Return the TypeReference of the value represented by the operand.
 boolean isDefinitelyNull()
          Does the operand definitely represent null?
 boolean isRef()
          Does the operand represent a value of the reference data type?
 boolean similar(Operand op)
          Are two operands semantically equivalent?
 String toString()
          Returns the string representation of this operand.
 
Methods inherited from class org.jikesrvm.compilers.opt.ir.operand.Operand
asAddressConstant, asBlock, asBranch, asClassConstant, asCondition, asDoubleConstant, asFloatConstant, asIntConstant, asLocation, asLongConstant, asMemory, asMethod, asNullConstant, asObjectConstant, asRegister, asStackLocation, asStringConstant, asTIBConstant, asType, conservativelyApproximates, getIndexInInstruction, isAddress, isAddressConstant, isBlock, isBranch, isClassConstant, isConstant, isDouble, isDoubleConstant, isFloat, isFloatConstant, isInt, isIntConstant, isIntLike, isLocation, isLong, isLongConstant, isMemory, isMethod, isMovableObjectConstant, isNullConstant, isObjectConstant, isRegister, isStackLocation, isStringConstant, isTIBConstant, isTrueGuard, isType, meet
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

NullConstantOperand

public NullConstantOperand()
Method Detail

copy

public Operand copy()
Return a new operand that is semantically equivalent to this.

Specified by:
copy in class Operand
Returns:
a copy of this

getType

public TypeReference getType()
Return the TypeReference of the value represented by the operand.

Overrides:
getType in class Operand
Returns:
TypeReference.NULL_TYPE

isRef

public boolean isRef()
Does the operand represent a value of the reference data type?

Overrides:
isRef in class Operand
Returns:
true

isDefinitelyNull

public boolean isDefinitelyNull()
Does the operand definitely represent null?

Overrides:
isDefinitelyNull in class Operand
Returns:
true

similar

public boolean similar(Operand op)
Are two operands semantically equivalent?

Specified by:
similar in class Operand
Parameters:
op - other operand
Returns:
true if this and op are semantically equivalent or false if they are not.

toString

public String toString()
Returns the string representation of this operand.

Overrides:
toString in class Object
Returns:
a string representation of this operand.
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