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"
/*******************************************************************************
 * 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.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;

public class BreakStatement extends BranchStatement {

public BreakStatement(char[] label, int sourceStart, int e) {
	super(label, sourceStart, e);
}
@Override
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {

	// here requires to generate a sequence of finally blocks invocations depending corresponding
	// to each of the traversed try statements, so that execution will terminate properly.

	// lookup the label, this should answer the returnContext
	FlowContext targetContext = (this.label == null)
		? flowContext.getTargetContextForDefaultBreak()
		: flowContext.getTargetContextForBreakLabel(this.label);

		// JLS 13 14.15
		if (targetContext instanceof SwitchFlowContext &&
				targetContext.associatedNode instanceof SwitchExpression) {
			currentScope.problemReporter().switchExpressionBreakNotAllowed(this);
		}
	if (targetContext == null) {
		if (this.label == null) {
			currentScope.problemReporter().invalidBreak(this);
		} else {
			currentScope.problemReporter().undefinedLabel(this);
		}
		return flowInfo; // pretend it did not break since no actual target
	}

	targetContext.recordAbruptExit();
	targetContext.expireNullCheckedFieldInfo();

	this.initStateIndex =
		currentScope.methodScope().recordInitializationStates(flowInfo);

	this.targetLabel = targetContext.breakLabel();
	FlowContext traversedContext = flowContext;
	int subCount = 0;
	this.subroutines = new SubRoutineStatement[5];

	do {
		SubRoutineStatement sub;
		if ((sub = traversedContext.subroutine()) != null) {
			if (subCount == this.subroutines.length) {
				System.arraycopy(this.subroutines, 0, (this.subroutines = new SubRoutineStatement[subCount*2]), 0, subCount); // grow
			}
			this.subroutines[subCount++] = sub;
			if (sub.isSubRoutineEscaping()) {
				break;
			}
		}
		traversedContext.recordReturnFrom(flowInfo.unconditionalInits());
		traversedContext.recordBreakTo(targetContext);

		if (traversedContext instanceof InsideSubRoutineFlowContext) {
			ASTNode node = traversedContext.associatedNode;
			if (node instanceof TryStatement) {
				TryStatement tryStatement = (TryStatement) node;
				flowInfo.addInitializationsFrom(tryStatement.subRoutineInits); // collect inits
			}
		} else if (traversedContext == targetContext) {
			// only record break info once accumulated through subroutines, and only against target context
			targetContext.recordBreakFrom(flowInfo);
			break;
		}
	} while ((traversedContext = traversedContext.getLocalParent()) != null);

	// resize subroutines
	if (subCount != this.subroutines.length) {
		System.arraycopy(this.subroutines, 0, (this.subroutines = new SubRoutineStatement[subCount]), 0, subCount);
	}
	return FlowInfo.DEAD_END;
}

@Override
public StringBuffer printStatement(int tab, StringBuffer output) {
	printIndent(tab, output).append("break"); //$NON-NLS-1$
	if (this.label != null) output.append(' ').append(this.label);
	return output.append(';');
}

@Override
public void traverse(ASTVisitor visitor, BlockScope blockscope) {
	visitor.visit(this, blockscope);
	visitor.endVisit(this, blockscope);
}
@Override
public boolean doesNotCompleteNormally() {
	return true;
}
}