| package org.checkerframework.dataflow.analysis; |
| |
| import java.util.Map; |
| import javax.lang.model.type.TypeMirror; |
| |
| /** |
| * Implementation of a {@link TransferResult} with two non-exceptional store; one for the 'then' |
| * edge and one for 'else'. The result of {@code getRegularStore} will be the least upper bound of |
| * the two underlying stores. |
| * |
| * @author Stefan Heule |
| * @param <S> the {@link Store} used to keep track of intermediate results |
| */ |
| public class ConditionalTransferResult<A extends AbstractValue<A>, S extends Store<S>> |
| extends TransferResult<A, S> { |
| |
| private final boolean storeChanged; |
| |
| /** The 'then' result store. */ |
| protected S thenStore; |
| |
| /** The 'else' result store. */ |
| protected S elseStore; |
| |
| /** |
| * Create a {@code ConditionalTransferResult} with {@code thenStore} as the resulting store if |
| * the corresponding {@link org.checkerframework.dataflow.cfg.node.Node} evaluates to {@code |
| * true} and {@code elseStore} otherwise. |
| * |
| * <p>For the meaning of storeChanged, see {@link |
| * org.checkerframework.dataflow.analysis.TransferResult#storeChanged}. |
| * |
| * <p><em>Exceptions</em>: If the corresponding {@link |
| * org.checkerframework.dataflow.cfg.node.Node} throws an exception, then it is assumed that no |
| * special handling is necessary and the store before the corresponding {@link |
| * org.checkerframework.dataflow.cfg.node.Node} will be passed along any exceptional edge. |
| * |
| * <p><em>Aliasing</em>: {@code thenStore} and {@code elseStore} are not allowed to be used |
| * anywhere outside of this class (including use through aliases). Complete control over the |
| * objects is transfered to this class. |
| */ |
| public ConditionalTransferResult(A value, S thenStore, S elseStore, boolean storeChanged) { |
| super(value); |
| this.thenStore = thenStore; |
| this.elseStore = elseStore; |
| this.storeChanged = storeChanged; |
| } |
| |
| public ConditionalTransferResult(A value, S thenStore, S elseStore) { |
| this(value, thenStore, elseStore, false); |
| } |
| |
| /** |
| * Create a {@code ConditionalTransferResult} with {@code thenStore} as the resulting store if |
| * the corresponding {@link org.checkerframework.dataflow.cfg.node.Node} evaluates to {@code |
| * true} and {@code elseStore} otherwise. |
| * |
| * <p><em>Exceptions</em>: If the corresponding {@link |
| * org.checkerframework.dataflow.cfg.node.Node} throws an exception, then the corresponding |
| * store in {@code exceptionalStores} is used. If no exception is found in {@code |
| * exceptionalStores}, then it is assumed that no special handling is necessary and the store |
| * before the corresponding {@link org.checkerframework.dataflow.cfg.node.Node} will be passed |
| * along any exceptional edge. |
| * |
| * <p><em>Aliasing</em>: {@code thenStore}, {@code elseStore}, and any store in {@code |
| * exceptionalStores} are not allowed to be used anywhere outside of this class (including use |
| * through aliases). Complete control over the objects is transfered to this class. |
| */ |
| public ConditionalTransferResult( |
| A value, |
| S thenStore, |
| S elseStore, |
| Map<TypeMirror, S> exceptionalStores, |
| boolean storeChanged) { |
| super(value); |
| this.exceptionalStores = exceptionalStores; |
| this.thenStore = thenStore; |
| this.elseStore = elseStore; |
| this.storeChanged = storeChanged; |
| } |
| |
| public ConditionalTransferResult( |
| A value, S thenStore, S elseStore, Map<TypeMirror, S> exceptionalStores) { |
| this(value, thenStore, elseStore, exceptionalStores, false); |
| } |
| |
| @Override |
| public S getRegularStore() { |
| return thenStore.leastUpperBound(elseStore); |
| } |
| |
| @Override |
| public S getThenStore() { |
| return thenStore; |
| } |
| |
| @Override |
| public S getElseStore() { |
| return elseStore; |
| } |
| |
| @Override |
| public boolean containsTwoStores() { |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder result = new StringBuilder(); |
| result.append("RegularTransferResult("); |
| result.append(System.getProperty("line.separator")); |
| result.append("resultValue = " + resultValue); |
| result.append(System.getProperty("line.separator")); |
| result.append("thenStore = " + thenStore); |
| result.append("elseStore = " + elseStore); |
| result.append(System.getProperty("line.separator")); |
| result.append(")"); |
| return result.toString(); |
| } |
| |
| /** @see org.checkerframework.dataflow.analysis.TransferResult#storeChanged() */ |
| @Override |
| public boolean storeChanged() { |
| return storeChanged; |
| } |
| } |