Module coneforest.psylla

Package coneforest.psylla.runtime

Class OperandStack

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

java.util.ArrayList<E>

coneforest.psylla.runtime.Stack<PsyObject>

coneforest.psylla.runtime.OperandStack

All Implemented Interfaces:

Serializable, Cloneable, Iterable<PsyObject>, Collection<PsyObject>, List<PsyObject>, RandomAccess

public class OperandStack
extends Stack<PsyObject>

An interpreter’s operand stack.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
OperandStack()

Method Summary

Modifier and Type	Method	Description
void	clearBackup()
void	ensureSize(int size)	Ensures that the operand stack is at least the given size.
int	findMarkPosition()	Returns the position of the topmost mark object on the operand stack.
<T extends PsyObject> T	getBacked(int index)
void	popOperands(int count)
void	pushOptional(Optional<? extends PsyObject> opt)
void	rollback()

Methods inherited from class coneforest.psylla.runtime.Stack

peek, pop, push, setSize

Methods inherited from class java.util.ArrayList

add, add, addAll, addAll, clear, clone, contains, ensureCapacity, equals, forEach, get, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, removeIf, replaceAll, retainAll, set, size, sort, spliterator, subList, toArray, toArray, trimToSize

Methods inherited from class java.util.AbstractCollection

containsAll, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, stream, toArray

Methods inherited from interface java.util.List

containsAll

Constructor Details

OperandStack

public OperandStack()

Method Details

getBacked

public <T extends PsyObject> T getBacked(int index)

clearBackup

public void clearBackup()

ensureSize

public void ensureSize(int size)
                throws PsyRangeCheckException,
PsyStackUnderflowException

Ensures that the operand stack is at least the given size.

Parameters:

size - the given size.

Throws:

PsyStackUnderflowException - when the operand stack’s size less than the given size.

PsyRangeCheckException - when given size is negative.

popOperands

public void popOperands(int count)
                 throws PsyStackUnderflowException

Throws:

PsyStackUnderflowException

rollback

public void rollback()

findMarkPosition

public int findMarkPosition()
                     throws PsyUnmatchedMarkException

Returns the position of the topmost mark object on the operand stack.

Returns:

the position of the topmost mark object on the operand stack.

Throws:

PsyUnmatchedMarkException - if there is no mark object on the operand stack.

pushOptional

public void pushOptional(Optional<? extends PsyObject> opt)