org.eclipse.jdt.internal.compiler.codegen.CaseLabel Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ecj Show documentation
This is Eclipse JDT Core Batch Compiler used by Scout SDK
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 2009 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.codegen;

public class CaseLabel extends BranchLabel {

	public int instructionPosition = POS_NOT_SET;

/**
 * CaseLabel constructor comment.
 * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
 */
public CaseLabel(CodeStream codeStream) {
	super(codeStream);
}

/*
* Put down  a reference to the array at the location in the codestream.
* #placeInstruction() must be performed prior to any #branch()
*/
void branch() {
	if (this.position == POS_NOT_SET) {
		addForwardReference(this.codeStream.position);
		// Leave 4 bytes free to generate the jump offset afterwards
		this.codeStream.position += 4;
		this.codeStream.classFileOffset += 4;
	} else { //Position is set. Write it!
		/*
		 * Position is set. Write it if it is not a wide branch.
		 */
		this.codeStream.writeSignedWord(this.position - this.instructionPosition);
	}
}

/*
* No support for wide branches yet
*/
void branchWide() {
	branch(); // case label branch is already wide
}

public boolean isCaseLabel() {
	return true;
}
public boolean isStandardLabel(){
	return false;
}
/*
* Put down  a reference to the array at the location in the codestream.
*/
public void place() {
	if ((this.tagBits & USED) != 0) {
		this.position = this.codeStream.getPosition();
	} else {
		this.position = this.codeStream.position;
	}
	if (this.instructionPosition != POS_NOT_SET) {
		int offset = this.position - this.instructionPosition;
		int[] forwardRefs = forwardReferences();
		for (int i = 0, length = forwardReferenceCount(); i < length; i++) {
			this.codeStream.writeSignedWord(forwardRefs[i], offset);
		}
		// add the label in the codeStream labels collection
		this.codeStream.addLabel(this);
	}
}

/*
* Put down  a reference to the array at the location in the codestream.
*/
void placeInstruction() {
	if (this.instructionPosition == POS_NOT_SET) {
		this.instructionPosition = this.codeStream.position;
	}
}
}