compiler/org/eclipse/jdt/internal/compiler/ast/Break.java

package org.eclipse.jdt.internal.compiler.ast;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
import org.eclipse.jdt.internal.compiler.IAbstractSyntaxTreeVisitor;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;

public class Break extends BranchStatement {
public Break(char[] label, int sourceStart, int e) {
	super(label, sourceStart,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;
	if (label == null) {
		targetContext = flowContext.getTargetContextForDefaultBreak();
	} else {
		targetContext = flowContext.getTargetContextForBreakLabel(label);
	}
	if (targetContext == null) {
		if (label == null) {
			currentScope.problemReporter().invalidBreak(this);
		} else {
			currentScope.problemReporter().undefinedLabel(this); // need to improve
		}
	} else {
		targetLabel = targetContext.breakLabel();
		targetContext.recordBreakFrom(flowInfo);
		FlowContext traversedContext = flowContext;
		int subIndex = 0, maxSub = 5;
		subroutines = new AstNode[maxSub];
		while (true) {
			AstNode sub;
			if ((sub = traversedContext.subRoutine()) != null) {
				if (subIndex == maxSub) {
					System.arraycopy(subroutines, 0, (subroutines = new AstNode[maxSub *= 2]), 0, subIndex); // grow
				}
				subroutines[subIndex++] = sub;
				if (sub.cannotReturn()) {
					break;
				}
			}
			if (traversedContext == targetContext) {
				break;
			} else {
				traversedContext = traversedContext.parent;
			}
		}
		// resize subroutines
		if (subIndex != maxSub) {
			System.arraycopy(subroutines, 0, (subroutines = new AstNode[subIndex]), 0, subIndex);
		}
	}
	return FlowInfo.DeadEnd;
}
public String toString(int tab){
	/* slow code */

	String s = tabString(tab) ;
	s = s + "break "/*nonNLS*/;
	if (label != null )
		s = s + new String(label) ;
	return s;
}
public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope blockscope) {
	visitor.visit(this, blockscope);
	visitor.endVisit(this, blockscope);
}
}