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/*******************************************************************************
* Copyright (c) 2000, 2019 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* 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 boolean isExpression = false;
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();
}
}
}
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