comp
Class IfNode

java.lang.Object
  |
  +--comp.Node
        |
        +--comp.IfNode

class IfNode

extends Node

A conditional. Consists of a test expression and two blocks: one for the then clause, another for the else clause.

Field Summary

(package private) BlockNode	elseClause
(package private) ExprNode	test
(package private) BlockNode	thenClause

Fields inherited from class comp.Node

asm, globalScope, labelCount, strings

Constructor Summary

IfNode(ExprNode test, BlockNode thenClause, BlockNode elseClause)

Method Summary

void	addDefs(Scope s) Add any variable definitions made by this node to the given scope.
void	asHTML(java.io.PrintStream out) Process the test, followed by the thenClause, followed by the elseClause
java.lang.String	codeGen(Scope scope, RegBank bank) Generate code for the test.
java.lang.String	toString()

Methods inherited from class comp.Node

addString, getLabel, lvalue, reset, rvalue

Methods inherited from class java.lang.Object

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

Field Detail

test

ExprNode test

thenClause

BlockNode thenClause

elseClause

BlockNode elseClause

Constructor Detail

IfNode

public IfNode(ExprNode test,
              BlockNode thenClause,
              BlockNode elseClause)

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

codeGen

public java.lang.String codeGen(Scope scope,
                                RegBank bank)

Generate code for the test. If it is false, we branch to the else clause, otherwise fall through to the then clause. The then clause is anchored with a jump to the bottom of the else clause.

Specified by:

codeGen in class Node

addDefs

public void addDefs(Scope s)

Description copied from class: Node

Add any variable definitions made by this node to the given scope.

Overrides:

addDefs in class Node

asHTML

public void asHTML(java.io.PrintStream out)

Process the test, followed by the thenClause, followed by the elseClause

Specified by:

asHTML in class Node