| /******************************************************************************* |
| * Copyright (c) 2000, 2017 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 |
| * Stephan Herrmann - Contribution for |
| * bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null" |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.compiler.flow; |
| |
| import org.eclipse.jdt.internal.compiler.ast.ASTNode; |
| import org.eclipse.jdt.internal.compiler.codegen.BranchLabel; |
| |
| /** |
| * Reflects the context of code analysis, keeping track of enclosing |
| * try statements, exception handlers, etc... |
| */ |
| public class SwitchFlowContext extends FlowContext { |
| |
| public BranchLabel breakLabel; |
| public UnconditionalFlowInfo initsOnBreak = FlowInfo.DEAD_END; |
| |
| public SwitchFlowContext(FlowContext parent, ASTNode associatedNode, BranchLabel breakLabel, boolean isPreTest, boolean inheritNullFieldChecks) { |
| super(parent, associatedNode, inheritNullFieldChecks); |
| this.breakLabel = breakLabel; |
| if (isPreTest && parent.conditionalLevel > -1) { |
| this.conditionalLevel++; |
| } |
| } |
| |
| @Override |
| public BranchLabel breakLabel() { |
| return this.breakLabel; |
| } |
| |
| @Override |
| public String individualToString() { |
| StringBuffer buffer = new StringBuffer("Switch flow context"); //$NON-NLS-1$ |
| buffer.append("[initsOnBreak -").append(this.initsOnBreak.toString()).append(']'); //$NON-NLS-1$ |
| return buffer.toString(); |
| } |
| |
| @Override |
| public boolean isBreakable() { |
| return true; |
| } |
| |
| @Override |
| public void recordBreakFrom(FlowInfo flowInfo) { |
| if ((this.initsOnBreak.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0) { |
| this.initsOnBreak = this.initsOnBreak.mergedWith(flowInfo.unconditionalInits()); |
| } |
| else { |
| this.initsOnBreak = flowInfo.unconditionalCopy(); |
| } |
| } |
| } |