avrora.syntax
Class Expr.RelativeAddress

java.lang.Object
  avrora.syntax.ASTNode
      avrora.syntax.Expr
          avrora.syntax.Expr.RelativeAddress

Enclosing class:

Expr

public static class Expr.RelativeAddress

extends Expr

The RelativeAddress class represents an expression that is derived from the addition (or subtraction) of a constant to the current byte address. This occurs in the GAS formats and Objdump.

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

AbstractToken	dot
AbstractToken	num
AbstractToken	op

Constructor Summary

Expr.RelativeAddress(AbstractToken d, AbstractToken o, 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.
AbstractToken	getLeftMostToken() The getLeftMostToken() method gets the first token associated with the abstract syntax tree node.
AbstractToken	getRightMostToken() The getRightMostToken() method gets the last token associated with the abstract syntax tree node.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

dot

public final AbstractToken dot

op

public final AbstractToken op

num

public final AbstractToken num

Constructor Detail

Expr.RelativeAddress

public Expr.RelativeAddress(AbstractToken d,
                            AbstractToken o,
                            AbstractToken n)

Method Detail

getLeftMostToken

public AbstractToken getLeftMostToken()

Description copied from class: ASTNode

The getLeftMostToken() method gets the first token associated with the abstract syntax tree node.

Specified by:

getLeftMostToken in class ASTNode

Returns:

an AbstractToken instance representing the first token that is a part of this syntactic item.

getRightMostToken

public AbstractToken getRightMostToken()

Description copied from class: ASTNode

The getRightMostToken() method gets the last token associated with the abstract syntax tree node.

Specified by:

getRightMostToken in class ASTNode

Returns:

an AbstractToken instance representing the last token that is a part of this syntactic item.

toString

public java.lang.String toString()

evaluate

public int evaluate(int currentByteAddress,
                    Context c)

The evaluate() method computes the value of the expression in this context and returns its value. Since this is a relative address, it simply evaluates the offset and adds it to the current address in the program and returns that 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