avrora.syntax
Class Expr.StringLiteral

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

Enclosing class:

Expr

public static class Expr.StringLiteral

extends Expr.Term

The StringLiteral class represents a string literal within the program. A string literal can be used within a list of initialized data and occupies a span of bytes. However, it cannot be evaluated to an integer. It is treated specifially in the simplification phase.

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

java.lang.String

value

Fields inherited from class avrora.syntax.Expr.Term

token

Constructor Summary

Expr.StringLiteral(AbstractToken tok)

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

Field Detail

value

public final java.lang.String value

Constructor Detail

Expr.StringLiteral

public Expr.StringLiteral(AbstractToken tok)

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. A string cannot be evaluated to a 32-bit integer; this method throws an exception.

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

Throws:

Avrora.InternalError - because a string cannot be evaluated to a 32-bit integer