avrora.syntax
Class SyntacticOperand

java.lang.Object
  avrora.syntax.ASTNode
      avrora.syntax.SyntacticOperand

All Implemented Interfaces:

Operand

Direct Known Subclasses:

SyntacticOperand.Expr, SyntacticOperand.Register

public abstract class SyntacticOperand

extends ASTNode

implements Operand

The SyntacticOperand class is an implementation of the avrora.core.Operand interface that corresponds to source assembly programs. Therefore instances of this class contain Tokens that tie them back to their original locations in the source assembly. This is useful for reporting assembly errors when the prototype fails to build an instruction because the operands do not meet the constraints specified in the Atmel instruction set reference.

See Also:

Operand, InstrPrototype

Nested Class Summary

static class	SyntacticOperand.Expr The SyntacticOperand.Expr class represents a constant expression that was specified in the source assembly as an expression.
static class	SyntacticOperand.Register The SyntacticOperand.Register class represents a register operand at the source level.

Nested classes inherited from class avrora.core.Operand

Operand.Constant

Field Summary

protected AbstractToken	left
protected AbstractToken	right

Method Summary

Operand.Constant	asConstant() The asConstant() method uses virtual dispatch to avoid a cast.
Operand.Register	asRegister() The asRegister() method uses virtual dispatch to avoid a cast.
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.
abstract void	simplify(int nextByteAddress, Context c)

Methods inherited from class java.lang.Object

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

Field Detail

left

protected final AbstractToken left

right

protected final AbstractToken right

Method Detail

simplify

public abstract void simplify(int nextByteAddress,
                              Context c)

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.

asRegister

public Operand.Register asRegister()

Description copied from interface: Operand

The asRegister() method uses virtual dispatch to avoid a cast. If this operand is an instance of Operand.Register it will return itself. Otherwise, it will return null.

Specified by:

asRegister in interface Operand

Returns:

this if this is an instance of Operand.Register; null otherwise

asConstant

public Operand.Constant asConstant()

Description copied from interface: Operand

The asConstant() method uses virtual dispatch to avoid a cast. If this operand is an instance of Operand.Constant it will return itself. Otherwise, it will return null.

Specified by:

asConstant in interface Operand

Returns:

this if this is an instance of Operand.Constant; null otherwise