net.sf.jode.expr
Class NopOperator

java.lang.Object
  net.sf.jode.expr.Expression
      net.sf.jode.expr.NopOperator

public class NopOperator

extends Expression

A NopOperator takes one arguments and returns it again. It is used as placeholder when the real operator is not yet known (e.g. in SwitchBlock, but also in every other Operator). A Nop operator doesn't have subExpressions; getSubExpressions() simply returns zero.

Author:

Jochen Hoenicke

Field Summary

Fields inherited from class net.sf.jode.expr.Expression

EMPTYSTRING, type

Constructor Summary

NopOperator(Type type)

Method Summary

Expression	addOperand(Expression op)
void	dumpExpression(TabbedPrintWriter writer)
boolean	equals(java.lang.Object o)
int	getFreeOperandCount() Get the number of operands.
int	getPriority() Get priority of the operator.
boolean	isConstant()
Expression	simplify()
void	updateSubTypes() Tells an expression that an outer expression has changed our type and that the inner types should be recalculated.
void	updateType() Tells an expression that an inner expression may have changed and that the type should be recalculated.

Methods inherited from class net.sf.jode.expr.Expression

canCombine, combine, containsConflictingLoad, containsMatchingLoad, dumpExpression, dumpExpression, fillDeclarables, fillInGenSet, getBreakPenalty, getParent, getType, hasSideEffects, isVoid, makeDeclaration, makeInitializer, negate, removeOnetimeLocals, setType, simplifyString, simplifyStringBuffer, toString, updateParentType

Methods inherited from class java.lang.Object

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

Constructor Detail

NopOperator

public NopOperator(Type type)

Method Detail

getFreeOperandCount

public int getFreeOperandCount()

Description copied from class: Expression

Get the number of operands.

Specified by:

getFreeOperandCount in class Expression

Returns:

The number of stack entries this expression needs.

getPriority

public int getPriority()

Description copied from class: Expression

Get priority of the operator. Currently this priorities are known:

• 1000 constant
• 950 new, .(field access), []
• 900 new[]
• 800 ++,-- (post)
• 700 ++,--(pre), +,-(unary), ~, !, cast
• 650 *,/, %
• 610 +,-
• 600 <<, >>, >>>
• 550 >, <, >=, <=, instanceof
• 500 ==, !=
• 450 &
• 420 ^
• 410 |
• 350 &&
• 310 ||
• 200 ?:
• 100 =, +=, -=, etc.

Specified by:

getPriority in class Expression

updateSubTypes

public void updateSubTypes()

Description copied from class: Expression

Tells an expression that an outer expression has changed our type and that the inner types should be recalculated.

Specified by:

updateSubTypes in class Expression

updateType

public void updateType()

Description copied from class: Expression

Tells an expression that an inner expression may have changed and that the type should be recalculated. This may call setType of the caller again.

Specified by:

updateType in class Expression

addOperand

public Expression addOperand(Expression op)

Specified by:

addOperand in class Expression

isConstant

public boolean isConstant()

Overrides:

isConstant in class Expression

equals

public boolean equals(java.lang.Object o)

simplify

public Expression simplify()

Overrides:

simplify in class Expression

dumpExpression

public void dumpExpression(TabbedPrintWriter writer)
                    throws java.io.IOException

Specified by:

dumpExpression in class Expression

Throws:

java.io.IOException