| /******************************************************************************* |
| * 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.codegen; |
| |
| public class CaseLabel extends Label { |
| public int instructionPosition = POS_NOT_SET; |
| public int backwardsBranch = POS_NOT_SET; |
| /** |
| * CaseLabel constructor comment. |
| * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream |
| */ |
| public CaseLabel(CodeStream codeStream) { |
| super(codeStream); |
| } |
| /* |
| * Put down a refernece to the array at the location in the codestream. |
| */ |
| void branch() { |
| if (position == POS_NOT_SET) { |
| addForwardReference(codeStream.position); |
| // Leave 4 bytes free to generate the jump offset afterwards |
| codeStream.position += 4; |
| codeStream.classFileOffset += 4; |
| } else { //Position is set. Write it! |
| codeStream.writeSignedWord(position - codeStream.position + 1); |
| } |
| } |
| /* |
| * Put down a refernece to the array at the location in the codestream. |
| */ |
| void branchWide() { |
| if (position == POS_NOT_SET) { |
| addForwardReference(codeStream.position); |
| // Leave 4 bytes free to generate the jump offset afterwards |
| codeStream.position += 4; |
| } else { //Position is set. Write it! |
| codeStream.writeSignedWord(position - codeStream.position + 1); |
| } |
| } |
| public boolean isStandardLabel(){ |
| return false; |
| } |
| /* |
| * Put down a reference to the array at the location in the codestream. |
| */ |
| public void place() { |
| position = codeStream.position; |
| if (instructionPosition == POS_NOT_SET) |
| backwardsBranch = position; |
| else { |
| int offset = position - instructionPosition; |
| for (int i = 0; i < forwardReferenceCount; i++) { |
| codeStream.writeSignedWord(forwardReferences[i], offset); |
| } |
| // add the label int the codeStream labels collection |
| codeStream.addLabel(this); |
| } |
| } |
| /* |
| * Put down a refernece to the array at the location in the codestream. |
| */ |
| void placeInstruction() { |
| if (instructionPosition == POS_NOT_SET) { |
| instructionPosition = codeStream.position; |
| if (backwardsBranch != POS_NOT_SET) { |
| int offset = backwardsBranch - instructionPosition; |
| for (int i = 0; i < forwardReferenceCount; i++) |
| codeStream.writeSignedWord(forwardReferences[i], offset); |
| backwardsBranch = POS_NOT_SET; |
| } |
| } |
| } |
| } |