Class ExprNode

Object
  ASTNode
      ExprNode

Direct Known Subclasses:

IdNode, LiteralNode, OpExprNode, SimpleExprNode

public abstract class ExprNode
extends ASTNode

An AST node representing an expression.

Nested Class Summary

Nested classes/interfaces inherited from class ASTNode

ASTNode.Opcode

Field Summary

protected int	column The column number of the first identifier or literal in this expression.
protected int	line The line number of the first identifier or literal in this expression.
protected Type	type The type of this expression.

Constructor Summary

ExprNode()

Method Summary

void	codeGen(int reg) Generates code to load the value of this expression into a register.
void	codeGen(String trueLabel, String falseLabel) Generates jump code for this expression and all sub-expressions.

Methods inherited from class ASTNode

indent, resolveNames, resolveTypes, toString, unparse

Methods inherited from class Object

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

Field Detail

type

protected Type type

The type of this expression.

line

protected int line

The line number of the first identifier or literal in this expression.

column

protected int column

The column number of the first identifier or literal in this expression.

Constructor Detail

ExprNode

public ExprNode()

Method Detail

codeGen

public void codeGen(String trueLabel,
                    String falseLabel)

Generates jump code for this expression and all sub-expressions. Only valid for expressions of type BOOL.

Parameters:

trueLabel - the label to jump to if the expression is true.

falseLabel - the label to jump to if the expression is false.

codeGen

public void codeGen(int reg)

Generates code to load the value of this expression into a register.

Parameters:

reg - the number of the s register where the result should be placed.