compiler/org/eclipse/jdt/internal/compiler/flow/ConditionalFlowInfo.java

/*******************************************************************************
 * 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.flow;

import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;

/**
 * Record conditional initialization status during definite assignment analysis
 *
 */
public class ConditionalFlowInfo extends FlowInfo {
	
	public FlowInfo initsWhenTrue;
	public FlowInfo initsWhenFalse;
	
	ConditionalFlowInfo(FlowInfo initsWhenTrue, FlowInfo initsWhenFalse){
		
		this.initsWhenTrue = initsWhenTrue;
		this.initsWhenFalse = initsWhenFalse; 
	}
	
	public FlowInfo addInitializationsFrom(FlowInfo otherInits) {
		
		this.initsWhenTrue.addInitializationsFrom(otherInits);
		this.initsWhenFalse.addInitializationsFrom(otherInits);
		return this;
	}
	
	public FlowInfo addPotentialInitializationsFrom(FlowInfo otherInits) {
		
		this.initsWhenTrue.addPotentialInitializationsFrom(otherInits);
		this.initsWhenFalse.addPotentialInitializationsFrom(otherInits);
		return this;
	}
	
	public FlowInfo asNegatedCondition() {
		
		FlowInfo extra = initsWhenTrue;
		initsWhenTrue = initsWhenFalse;
		initsWhenFalse = extra;
		return this;
	}

	public FlowInfo copy() {
		
		return new ConditionalFlowInfo(initsWhenTrue.copy(), initsWhenFalse.copy());
	}
	
	public FlowInfo initsWhenFalse() {
		
		return initsWhenFalse;
	}
	
	public FlowInfo initsWhenTrue() {
		
		return initsWhenTrue;
	}
	
	/**
	 * Check status of definite assignment for a field.
	 */
	public boolean isDefinitelyAssigned(FieldBinding field) {
		
		return initsWhenTrue.isDefinitelyAssigned(field) 
				&& initsWhenFalse.isDefinitelyAssigned(field);
	}
	
	/**
	 * Check status of definite assignment for a local variable.
	 */
	public boolean isDefinitelyAssigned(LocalVariableBinding local) {
		
		return initsWhenTrue.isDefinitelyAssigned(local) 
				&& initsWhenFalse.isDefinitelyAssigned(local);
	}
	
public boolean isDefinitelyNonNull(LocalVariableBinding local) {
	return initsWhenTrue.isDefinitelyNonNull(local) 
			&& initsWhenFalse.isDefinitelyNonNull(local);
}
	
public boolean isDefinitelyNull(LocalVariableBinding local) {
	return initsWhenTrue.isDefinitelyNull(local) 
			&& initsWhenFalse.isDefinitelyNull(local);
}

public boolean isDefinitelyUnknown(LocalVariableBinding local) {
	return initsWhenTrue.isDefinitelyUnknown(local) 
			&& initsWhenFalse.isDefinitelyUnknown(local);
}
	/**
	 * Check status of potential assignment for a field.
	 */
	public boolean isPotentiallyAssigned(FieldBinding field) {
		
		return initsWhenTrue.isPotentiallyAssigned(field) 
				|| initsWhenFalse.isPotentiallyAssigned(field);
	}
	
	/**
	 * Check status of potential assignment for a local variable.
	 */
	public boolean isPotentiallyAssigned(LocalVariableBinding local) {
		
		return initsWhenTrue.isPotentiallyAssigned(local) 
				|| initsWhenFalse.isPotentiallyAssigned(local);
	}
	
public boolean isPotentiallyNull(LocalVariableBinding local) {
	return initsWhenTrue.isPotentiallyNull(local) 
		|| initsWhenFalse.isPotentiallyNull(local);
}	

public boolean isPotentiallyUnknown(LocalVariableBinding local) {
	return initsWhenTrue.isPotentiallyUnknown(local) 
		|| initsWhenFalse.isPotentiallyUnknown(local);
}	

public boolean isProtectedNonNull(LocalVariableBinding local) {
	return initsWhenTrue.isProtectedNonNull(local) 
		&& initsWhenFalse.isProtectedNonNull(local);
}		
	
public boolean isProtectedNull(LocalVariableBinding local) {
	return initsWhenTrue.isProtectedNull(local) 
		&& initsWhenFalse.isProtectedNull(local);
}		
	
public void markAsComparedEqualToNonNull(LocalVariableBinding local) {
	initsWhenTrue.markAsComparedEqualToNonNull(local);
	initsWhenFalse.markAsComparedEqualToNonNull(local);
}

public void markAsComparedEqualToNull(LocalVariableBinding local) {
	initsWhenTrue.markAsComparedEqualToNull(local);
    initsWhenFalse.markAsComparedEqualToNull(local);
}
	
	/**
	 * Record a field got definitely assigned.
	 */
	public void markAsDefinitelyAssigned(FieldBinding field) {
		
		initsWhenTrue.markAsDefinitelyAssigned(field);
		initsWhenFalse.markAsDefinitelyAssigned(field);	
	}
	
	/**
	 * Record a field got definitely assigned.
	 */
	public void markAsDefinitelyAssigned(LocalVariableBinding local) {
		
		initsWhenTrue.markAsDefinitelyAssigned(local);
		initsWhenFalse.markAsDefinitelyAssigned(local);	
	}
	
	/**
	 * Record a field got definitely assigned to non-null value.
	 */
	public void markAsDefinitelyNonNull(FieldBinding field) {
		
		initsWhenTrue.markAsDefinitelyNonNull(field);
		initsWhenFalse.markAsDefinitelyNonNull(field);	
	}
	
	/**
	 * Record a field got definitely assigned to non-null value
	 */
	public void markAsDefinitelyNonNull(LocalVariableBinding local) {
		
		initsWhenTrue.markAsDefinitelyNonNull(local);
		initsWhenFalse.markAsDefinitelyNonNull(local);	
	}

	/**
	 * Record a field got definitely assigned to null.
	 */
	public void markAsDefinitelyNull(FieldBinding field) {
		
		initsWhenTrue.markAsDefinitelyNull(field);
		initsWhenFalse.markAsDefinitelyNull(field);	
	}
	
	/**
	 * Record a field got definitely assigned to null.
	 */
	public void markAsDefinitelyNull(LocalVariableBinding local) {
		
		initsWhenTrue.markAsDefinitelyNull(local);
		initsWhenFalse.markAsDefinitelyNull(local);	
	}

public void markAsDefinitelyUnknown(LocalVariableBinding local) {
	initsWhenTrue.markAsDefinitelyUnknown(local);
	initsWhenFalse.markAsDefinitelyUnknown(local);	
}

public FlowInfo setReachMode(int reachMode) {
	if (reachMode == REACHABLE) {
		this.tagBits &= ~UNREACHABLE;
	}
	else {
		this.tagBits |= UNREACHABLE;
	}
	initsWhenTrue.setReachMode(reachMode);
	initsWhenFalse.setReachMode(reachMode);
	return this;
}
	
public UnconditionalFlowInfo mergedWith(UnconditionalFlowInfo otherInits) {
	return unconditionalInits().mergedWith(otherInits);
}

public UnconditionalFlowInfo nullInfoLessUnconditionalCopy() {
	return unconditionalInitsWithoutSideEffect().
		nullInfoLessUnconditionalCopy();
}
	public String toString() {
		
		return "FlowInfo<true: " + initsWhenTrue.toString() + ", false: " + initsWhenFalse.toString() + ">"; //$NON-NLS-1$ //$NON-NLS-3$ //$NON-NLS-2$
	}

public FlowInfo safeInitsWhenTrue() {
	return initsWhenTrue;
}

public UnconditionalFlowInfo unconditionalCopy() {
	return initsWhenTrue.unconditionalCopy().
			mergedWith(initsWhenFalse.unconditionalInits());
}

public UnconditionalFlowInfo unconditionalFieldLessCopy() {
	return initsWhenTrue.unconditionalFieldLessCopy().
		mergedWith(initsWhenFalse.unconditionalFieldLessCopy()); 
	// should never happen, hence suboptimal does not hurt
}

public UnconditionalFlowInfo unconditionalInits() {
	return initsWhenTrue.unconditionalInits().
			mergedWith(initsWhenFalse.unconditionalInits());
}

public UnconditionalFlowInfo unconditionalInitsWithoutSideEffect() {
	// cannot do better here than unconditionalCopy - but still a different 
	// operation for UnconditionalFlowInfo
	return initsWhenTrue.unconditionalCopy().
			mergedWith(initsWhenFalse.unconditionalInits());
}
}