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/*******************************************************************************
* 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.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
public class ContinueStatement extends BranchStatement {
public ContinueStatement(char[] l, int s, int e) {
super(l, s, e);
}
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 = (label == null)
? flowContext.getTargetContextForDefaultContinue()
: flowContext.getTargetContextForContinueLabel(label);
if (targetContext == null) {
if (label == null) {
currentScope.problemReporter().invalidContinue(this);
} else {
currentScope.problemReporter().undefinedLabel(this);
}
return flowInfo; // pretend it did not continue since no actual target
}
if (targetContext == FlowContext.NotContinuableContext) {
currentScope.problemReporter().invalidContinue(this);
return flowInfo; // pretend it did not continue since no actual target
}
targetLabel = targetContext.continueLabel();
FlowContext traversedContext = flowContext;
int subIndex = 0, maxSub = 5;
subroutines = new SubRoutineStatement[maxSub];
do {
SubRoutineStatement sub;
if ((sub = traversedContext.subRoutine()) != null) {
if (subIndex == maxSub) {
System.arraycopy(subroutines, 0, (subroutines = new SubRoutineStatement[maxSub*=2]), 0, subIndex); // grow
}
subroutines[subIndex++] = sub;
if (sub.isSubRoutineEscaping()) {
break;
}
}
traversedContext.recordReturnFrom(flowInfo.unconditionalInits());
ASTNode node;
if ((node = traversedContext.associatedNode) instanceof TryStatement) {
TryStatement tryStatement = (TryStatement) node;
flowInfo.addInitializationsFrom(tryStatement.subRoutineInits); // collect inits
} else if (traversedContext == targetContext) {
// only record continue info once accumulated through subroutines, and only against target context
targetContext.recordContinueFrom(flowInfo);
break;
}
} while ((traversedContext = traversedContext.parent) != null);
// resize subroutines
if (subIndex != maxSub) {
System.arraycopy(subroutines, 0, (subroutines = new SubRoutineStatement[subIndex]), 0, subIndex);
}
return FlowInfo.DEAD_END;
}
public StringBuffer printStatement(int tab, StringBuffer output) {
printIndent(tab, output).append("continue "); //$NON-NLS-1$
if (label != null) output.append(label);
return output.append(';');
}
public void traverse(
ASTVisitor visitor,
BlockScope blockScope) {
visitor.visit(this, blockScope);
visitor.endVisit(this, blockScope);
}
}