Translate
Class Exp.Cx

java.lang.Object
  Translate.Exp
      Translate.Exp.Cx

Direct Known Subclasses:

Exp.Cx.IfThenElseExp, Exp.Cx.Rel

Enclosing class:

Exp

public abstract static class Exp.Cx
extends Exp

A wrapper for tree code that may be used both to compute a Boolean value and to effect transfer of control. Concrete subclasses of Cx are used to capture evaluation of different kinds of conditional.

Nested Class Summary

static class	Exp.Cx.IfThenElseExp A wrapper for short-circuiting conditional expressions (e.g., &&, ||).
static class	Exp.Cx.Rel A wrapper for relational operators that may be used for both their Boolean value and for control transfer.

Nested classes/interfaces inherited from class Translate.Exp

Exp.Cx, Exp.Ex, Exp.Nx

Constructor Summary

Exp.Cx()

Method Summary

abstract Tree.Stm	unCx(Temp.Label t, Temp.Label f) Unwrap this expression, to obtain code that causes transfer of control based on the Boolean value of the expression.
Tree.Exp	unEx() Unwrap this expression, to obtain tree code that computes a value.
Tree.Stm	unNx() Unwrap this expression, to obtain tree code that should be executed only for its side-effects.

Methods inherited from class java.lang.Object

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

Constructor Detail

Exp.Cx

public Exp.Cx()

Method Detail

unEx

public Tree.Exp unEx()

Description copied from class: Exp

Unwrap this expression, to obtain tree code that computes a value.

Specified by:

unEx in class Exp

Returns:

the tree code that computes the value

unNx

public Tree.Stm unNx()

Description copied from class: Exp

Unwrap this expression, to obtain tree code that should be executed only for its side-effects.

Specified by:

unNx in class Exp

Returns:

the tree code to be executed for its side-effects

unCx

public abstract Tree.Stm unCx(Temp.Label t,
                              Temp.Label f)

Description copied from class: Exp

Unwrap this expression, to obtain code that causes transfer of control based on the Boolean value of the expression.

Specified by:

unCx in class Exp

Parameters:

t - label to branch to on true

f - label to branch to on false

Returns:

the tree code to evaluate the expression and effect the transfer of control.