repo/org.ibex.tool/src/org/eclipse/jdt/internal/compiler/ast/SubRoutineStatement.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.compiler.ast;
  12
  13 import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
  14 import org.eclipse.jdt.internal.compiler.codegen.ExceptionLabel;
  15 import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
  16
  17 /**
  18  * Extra behavior for statements which are generating subroutines
  19  */
  20 public abstract class SubRoutineStatement extends Statement {
  21
  22         public static final ExceptionLabel[] NO_EXCEPTION_HANDLER = new ExceptionLabel[0];
  23         ExceptionLabel[] anyExceptionLabels = NO_EXCEPTION_HANDLER;
  24         int anyExceptionLabelsCount = 0;
  25
  26         public abstract boolean isSubRoutineEscaping();
  27
  28         public abstract void generateSubRoutineInvocation(BlockScope currentScope, CodeStream codeStream);
  29
  30         public ExceptionLabel enterAnyExceptionHandler(CodeStream codeStream) {
  31
  32                 int length;
  33                 if ((length = this.anyExceptionLabelsCount) == this.anyExceptionLabels.length) {
  34                         System.arraycopy(this.anyExceptionLabels, 0 , this.anyExceptionLabels=new ExceptionLabel[length*2 + 1], 0, length);
  35                 }
  36                 ExceptionLabel exceptionLabel = new ExceptionLabel(codeStream, null);
  37                 this.anyExceptionLabels[this.anyExceptionLabelsCount++] = exceptionLabel;
  38                 return exceptionLabel;
  39         }
  40
  41         public void exitAnyExceptionHandler() {
  42                 if (this.anyExceptionLabelsCount == 0) return;
  43                 ExceptionLabel currentLabel = this.anyExceptionLabels[this.anyExceptionLabelsCount-1];
  44                 if (currentLabel.start == currentLabel.codeStream.position) {
  45                         // discard empty exception handler
  46                         this.anyExceptionLabels[--this.anyExceptionLabelsCount] = null;
  47                 }
  48                 currentLabel.placeEnd();
  49         }
  50
  51         public void placeAllAnyExceptionHandlers() {
  52
  53                 for (int i = 0; i < this.anyExceptionLabelsCount; i++) {
  54                         this.anyExceptionLabels[i].place();
  55                 }
  56         }
  57
  58         public static void reenterExceptionHandlers(SubRoutineStatement[] subroutines, int max, CodeStream codeStream) {
  59                 if (subroutines == null) return;
  60                 if (max < 0) max = subroutines.length;
  61                 for (int i = 0; i < max; i++) {
  62                         subroutines[i].enterAnyExceptionHandler(codeStream);
  63                 }
  64         }
  65 }