| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.compiler.flow; |
| |
| import org.eclipse.jdt.internal.compiler.lookup.FieldBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding; |
| |
| /** |
| * Record conditional initialization status during definite assignment analysis |
| * |
| */ |
| public class ConditionalFlowInfo extends FlowInfo { |
| |
| public FlowInfo initsWhenTrue; |
| public FlowInfo initsWhenFalse; |
| |
| ConditionalFlowInfo(FlowInfo initsWhenTrue, FlowInfo initsWhenFalse){ |
| |
| this.initsWhenTrue = initsWhenTrue; |
| this.initsWhenFalse = initsWhenFalse; |
| } |
| |
| public FlowInfo addInitializationsFrom(FlowInfo otherInits) { |
| |
| this.initsWhenTrue.addInitializationsFrom(otherInits); |
| this.initsWhenFalse.addInitializationsFrom(otherInits); |
| return this; |
| } |
| |
| public FlowInfo addPotentialInitializationsFrom(FlowInfo otherInits) { |
| |
| this.initsWhenTrue.addPotentialInitializationsFrom(otherInits); |
| this.initsWhenFalse.addPotentialInitializationsFrom(otherInits); |
| return this; |
| } |
| |
| public FlowInfo asNegatedCondition() { |
| |
| FlowInfo extra = initsWhenTrue; |
| initsWhenTrue = initsWhenFalse; |
| initsWhenFalse = extra; |
| return this; |
| } |
| |
| public FlowInfo copy() { |
| |
| return new ConditionalFlowInfo(initsWhenTrue.copy(), initsWhenFalse.copy()); |
| } |
| |
| public FlowInfo initsWhenFalse() { |
| |
| return initsWhenFalse; |
| } |
| |
| public FlowInfo initsWhenTrue() { |
| |
| return initsWhenTrue; |
| } |
| |
| /** |
| * Check status of definite assignment for a field. |
| */ |
| public boolean isDefinitelyAssigned(FieldBinding field) { |
| |
| return initsWhenTrue.isDefinitelyAssigned(field) |
| && initsWhenFalse.isDefinitelyAssigned(field); |
| } |
| |
| /** |
| * Check status of definite assignment for a local variable. |
| */ |
| public boolean isDefinitelyAssigned(LocalVariableBinding local) { |
| |
| return initsWhenTrue.isDefinitelyAssigned(local) |
| && initsWhenFalse.isDefinitelyAssigned(local); |
| } |
| |
| /** |
| * Check status of definite non-null assignment for a field. |
| */ |
| public boolean isDefinitelyNonNull(FieldBinding field) { |
| |
| return initsWhenTrue.isDefinitelyNonNull(field) |
| && initsWhenFalse.isDefinitelyNonNull(field); |
| } |
| |
| /** |
| * Check status of definite non-null assignment for a local variable. |
| */ |
| public boolean isDefinitelyNonNull(LocalVariableBinding local) { |
| |
| return initsWhenTrue.isDefinitelyNonNull(local) |
| && initsWhenFalse.isDefinitelyNonNull(local); |
| } |
| |
| /** |
| * Check status of definite null assignment for a field. |
| */ |
| public boolean isDefinitelyNull(FieldBinding field) { |
| |
| return initsWhenTrue.isDefinitelyNull(field) |
| && initsWhenFalse.isDefinitelyNull(field); |
| } |
| |
| /** |
| * Check status of definite null assignment for a local variable. |
| */ |
| public boolean isDefinitelyNull(LocalVariableBinding local) { |
| |
| return initsWhenTrue.isDefinitelyNull(local) |
| && initsWhenFalse.isDefinitelyNull(local); |
| } |
| |
| public int reachMode(){ |
| return unconditionalInits().reachMode(); |
| } |
| |
| public boolean isReachable(){ |
| |
| return unconditionalInits().isReachable(); |
| //should maybe directly be: false |
| } |
| |
| /** |
| * Check status of potential assignment for a field. |
| */ |
| public boolean isPotentiallyAssigned(FieldBinding field) { |
| |
| return initsWhenTrue.isPotentiallyAssigned(field) |
| || initsWhenFalse.isPotentiallyAssigned(field); |
| } |
| |
| /** |
| * Check status of potential assignment for a local variable. |
| */ |
| public boolean isPotentiallyAssigned(LocalVariableBinding local) { |
| |
| return initsWhenTrue.isPotentiallyAssigned(local) |
| || initsWhenFalse.isPotentiallyAssigned(local); |
| } |
| |
| /** |
| * Record a field got definitely assigned. |
| */ |
| public void markAsDefinitelyAssigned(FieldBinding field) { |
| |
| initsWhenTrue.markAsDefinitelyAssigned(field); |
| initsWhenFalse.markAsDefinitelyAssigned(field); |
| } |
| |
| /** |
| * Record a field got definitely assigned. |
| */ |
| public void markAsDefinitelyAssigned(LocalVariableBinding local) { |
| |
| initsWhenTrue.markAsDefinitelyAssigned(local); |
| initsWhenFalse.markAsDefinitelyAssigned(local); |
| } |
| |
| /** |
| * Record a field got definitely assigned to non-null value. |
| */ |
| public void markAsDefinitelyNonNull(FieldBinding field) { |
| |
| initsWhenTrue.markAsDefinitelyNonNull(field); |
| initsWhenFalse.markAsDefinitelyNonNull(field); |
| } |
| |
| /** |
| * Record a field got definitely assigned to non-null value |
| */ |
| public void markAsDefinitelyNonNull(LocalVariableBinding local) { |
| |
| initsWhenTrue.markAsDefinitelyNonNull(local); |
| initsWhenFalse.markAsDefinitelyNonNull(local); |
| } |
| |
| /** |
| * Record a field got definitely assigned to null. |
| */ |
| public void markAsDefinitelyNull(FieldBinding field) { |
| |
| initsWhenTrue.markAsDefinitelyNull(field); |
| initsWhenFalse.markAsDefinitelyNull(field); |
| } |
| |
| /** |
| * Record a field got definitely assigned to null. |
| */ |
| public void markAsDefinitelyNull(LocalVariableBinding local) { |
| |
| initsWhenTrue.markAsDefinitelyNull(local); |
| initsWhenFalse.markAsDefinitelyNull(local); |
| } |
| |
| /** |
| * Clear the initialization info for a field |
| */ |
| public void markAsDefinitelyNotAssigned(FieldBinding field) { |
| |
| initsWhenTrue.markAsDefinitelyNotAssigned(field); |
| initsWhenFalse.markAsDefinitelyNotAssigned(field); |
| } |
| |
| /** |
| * Clear the initialization info for a local variable |
| */ |
| public void markAsDefinitelyNotAssigned(LocalVariableBinding local) { |
| |
| initsWhenTrue.markAsDefinitelyNotAssigned(local); |
| initsWhenFalse.markAsDefinitelyNotAssigned(local); |
| } |
| |
| public FlowInfo setReachMode(int reachMode) { |
| |
| initsWhenTrue.setReachMode(reachMode); |
| initsWhenFalse.setReachMode(reachMode); |
| return this; |
| } |
| |
| /** |
| * Converts conditional receiver into inconditional one, updated in the following way: <ul> |
| * <li> intersection of definitely assigned variables, |
| * <li> union of potentially assigned variables. |
| * </ul> |
| */ |
| public UnconditionalFlowInfo mergedWith(UnconditionalFlowInfo otherInits) { |
| |
| return unconditionalInits().mergedWith(otherInits); |
| } |
| |
| public String toString() { |
| |
| return "FlowInfo<true: " + initsWhenTrue.toString() + ", false: " + initsWhenFalse.toString() + ">"; //$NON-NLS-1$ //$NON-NLS-3$ //$NON-NLS-2$ |
| } |
| |
| public UnconditionalFlowInfo unconditionalInits() { |
| |
| return initsWhenTrue.unconditionalInits().copy() |
| .mergedWith(initsWhenFalse.unconditionalInits()); |
| } |
| } |