gnu.expr
Class ConditionalTarget

java.lang.Object
  gnu.expr.Target
      gnu.expr.ConditionalTarget

public class ConditionalTarget
extends Target

This is the Target of a boolean expression, in a conditional context. If the expression evaluates to, transfer to the ifTrue label; if false, tranfer to the ifFalse label.

Field Summary

Label	ifFalse
Label	ifTrue
boolean	trueBranchComesFirst True if the ifTrue label comes before the ifFalse label.

Fields inherited from class gnu.expr.Target

Ignore, pushObject

Constructor Summary

ConditionalTarget(Label ifTrue, Label ifFalse, Language language)

Method Summary

void	compileFromStack(Compilation comp, Type stackType)
void	emitGotoFirstBranch(CodeAttr code) Goto whichever of IfTrue or ifFalse is specified by trueBranchComesFirst.
Type	getType()

Methods inherited from class gnu.expr.Target

pushValue

Methods inherited from class java.lang.Object

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

Field Detail

ifTrue

public Label ifTrue

ifFalse

public Label ifFalse

trueBranchComesFirst

public boolean trueBranchComesFirst

True if the ifTrue label comes before the ifFalse label. This is used in the hope we can optimize away a branch followed by its target.

Constructor Detail

ConditionalTarget

public ConditionalTarget(Label ifTrue,
                         Label ifFalse,
                         Language language)

Parameters:

ifTrue - label to jump to if this evaluates to true

ifFalse - label to jump to if true

language - specifies what values are true

Method Detail

getType

public Type getType()

Specified by:

getType in class Target

compileFromStack

public void compileFromStack(Compilation comp,
                             Type stackType)

Specified by:

compileFromStack in class Target

emitGotoFirstBranch

public final void emitGotoFirstBranch(CodeAttr code)

Goto whichever of IfTrue or ifFalse is specified by trueBranchComesFirst. Normally, the goto should get optimized away as a no-op.