| /******************************************************************************* |
| * 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() |
| */ |
| @Override |
| 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 |
| */ |
| @Override |
| void branchWide() { |
| branch(); // case label branch is already wide |
| } |
| |
| @Override |
| public boolean isCaseLabel() { |
| return true; |
| } |
| @Override |
| public boolean isStandardLabel(){ |
| return false; |
| } |
| /* |
| * Put down a reference to the array at the location in the codestream. |
| */ |
| @Override |
| 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; |
| } |
| } |
| } |