| /******************************************************************************* |
| * 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.ast; |
| |
| import org.eclipse.jdt.internal.compiler.codegen.CodeStream; |
| import org.eclipse.jdt.internal.compiler.codegen.ExceptionLabel; |
| import org.eclipse.jdt.internal.compiler.lookup.BlockScope; |
| |
| /** |
| * Extra behavior for statements which are generating subroutines |
| */ |
| public abstract class SubRoutineStatement extends Statement { |
| |
| public static final ExceptionLabel[] NO_EXCEPTION_HANDLER = new ExceptionLabel[0]; |
| ExceptionLabel[] anyExceptionLabels = NO_EXCEPTION_HANDLER; |
| int anyExceptionLabelsCount = 0; |
| |
| public abstract boolean isSubRoutineEscaping(); |
| |
| public abstract void generateSubRoutineInvocation(BlockScope currentScope, CodeStream codeStream); |
| |
| public ExceptionLabel enterAnyExceptionHandler(CodeStream codeStream) { |
| |
| int length; |
| if ((length = this.anyExceptionLabelsCount) == this.anyExceptionLabels.length) { |
| System.arraycopy(this.anyExceptionLabels, 0 , this.anyExceptionLabels=new ExceptionLabel[length*2 + 1], 0, length); |
| } |
| ExceptionLabel exceptionLabel = new ExceptionLabel(codeStream, null); |
| this.anyExceptionLabels[this.anyExceptionLabelsCount++] = exceptionLabel; |
| return exceptionLabel; |
| } |
| |
| public void exitAnyExceptionHandler() { |
| if (this.anyExceptionLabelsCount == 0) return; |
| ExceptionLabel currentLabel = this.anyExceptionLabels[this.anyExceptionLabelsCount-1]; |
| if (currentLabel.start == currentLabel.codeStream.position) { |
| // discard empty exception handler |
| this.anyExceptionLabels[--this.anyExceptionLabelsCount] = null; |
| currentLabel.codeStream.removeExceptionHandler(currentLabel); |
| } else { |
| currentLabel.placeEnd(); |
| } |
| } |
| |
| public void placeAllAnyExceptionHandlers() { |
| |
| for (int i = 0; i < this.anyExceptionLabelsCount; i++) { |
| this.anyExceptionLabels[i].place(); |
| } |
| } |
| |
| public static void reenterExceptionHandlers(SubRoutineStatement[] subroutines, int max, CodeStream codeStream) { |
| if (subroutines == null) return; |
| if (max < 0) max = subroutines.length; |
| for (int i = 0; i < max; i++) { |
| subroutines[i].enterAnyExceptionHandler(codeStream); |
| } |
| } |
| } |