avrora.syntax
Class Expr.Variable

java.lang.Object
  avrora.syntax.ASTNode
      avrora.syntax.Expr
          avrora.syntax.Expr.Term
              avrora.syntax.Expr.Variable

Enclosing class:

Expr

public static class Expr.Variable

extends Expr.Term

The Variable class represents a variable reference within the program.

Nested Class Summary

Nested classes inherited from class avrora.syntax.Expr

Expr.BinOp, Expr.CharLiteral, Expr.Constant, Expr.Func, Expr.RelativeAddress, Expr.StringLiteral, Expr.Term, Expr.UnOp, Expr.Variable

Field Summary

Fields inherited from class avrora.syntax.Expr.Term

token

Constructor Summary

Expr.Variable(AbstractToken n)

Method Summary

int	evaluate(int currentByteAddress, Context c) The evaluate() method computes the value of the expression in this context and returns its value.

Methods inherited from class avrora.syntax.Expr.Term

getLeftMostToken, getRightMostToken, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Expr.Variable

public Expr.Variable(AbstractToken n)

Method Detail

evaluate

public int evaluate(int currentByteAddress,
                    Context c)

The evaluate() method computes the value of the expression in this context and returns its value. This implementation works straightforwardly by looking up the variable in the context and returning its value.

Specified by:

evaluate in class Expr

Parameters:

currentByteAddress - the current byte address within the program

c - the context in which to evaluate this expression

Returns:

the value of the expression as a 32-bit integer