| package org.checkerframework.dataflow.cfg.block; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * Base class of the {@link Block} implementation hierarchy. |
| * |
| * @author Stefan Heule |
| * |
| */ |
| public abstract class BlockImpl implements Block { |
| |
| /** A unique ID for this node. */ |
| protected long id = BlockImpl.uniqueID(); |
| |
| /** The last ID that has already been used. */ |
| protected static long lastId = 0; |
| |
| /** The type of this basic block. */ |
| protected BlockType type; |
| |
| /** The set of predecessors. */ |
| protected Set<BlockImpl> predecessors; |
| |
| /** |
| * @return a fresh identifier |
| */ |
| private static long uniqueID() { |
| return lastId++; |
| } |
| |
| public BlockImpl() { |
| predecessors = new HashSet<>(); |
| } |
| |
| @Override |
| public long getId() { |
| return id; |
| } |
| |
| @Override |
| public BlockType getType() { |
| return type; |
| } |
| |
| /** |
| * @return the list of predecessors of this basic block |
| */ |
| public Set<BlockImpl> getPredecessors() { |
| return Collections.unmodifiableSet(predecessors); |
| } |
| |
| public void addPredecessor(BlockImpl pred) { |
| predecessors.add(pred); |
| } |
| |
| public void removePredecessor(BlockImpl pred) { |
| predecessors.remove(pred); |
| } |
| |
| } |