org.eclipse.jdt.internal.compiler.codegen.CaseLabel Maven / Gradle / Ivy
/*******************************************************************************
* 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 int 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;
}
}
}