net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/flow/InsideSubRoutineFlowContext.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 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 net.sourceforge.phpdt.internal.compiler.flow;
  12
  13 import net.sourceforge.phpdt.internal.compiler.ast.ASTNode;
  14
  15 /**
  16  * Reflects the context of code analysis, keeping track of enclosing
  17  *      try statements, exception handlers, etc...
  18  */
  19 public class InsideSubRoutineFlowContext extends FlowContext {
  20
  21         public UnconditionalFlowInfo initsOnReturn;
  22
  23         public InsideSubRoutineFlowContext(
  24                 FlowContext parent,
  25                 ASTNode associatedNode) {
  26                 super(parent, associatedNode);
  27                 this.initsOnReturn = FlowInfo.DEAD_END;
  28         }
  29
  30         public String individualToString() {
  31
  32                 StringBuffer buffer = new StringBuffer("Inside SubRoutine flow context"); //$NON-NLS-1$
  33                 buffer.append("[initsOnReturn -").append(initsOnReturn.toString()).append(']'); //$NON-NLS-1$
  34                 return buffer.toString();
  35         }
  36
  37         public UnconditionalFlowInfo initsOnReturn(){
  38                 return this.initsOnReturn;
  39         }
  40
  41         public boolean isNonReturningContext() {
  42                 return associatedNode.cannotReturn();
  43         }
  44
  45         public ASTNode subRoutine() {
  46                 return associatedNode;
  47         }
  48
  49         public void recordReturnFrom(FlowInfo flowInfo) {
  50
  51                 if (!flowInfo.isReachable()) return;
  52                 if (initsOnReturn == FlowInfo.DEAD_END) {
  53                         initsOnReturn = flowInfo.copy().unconditionalInits();
  54                 } else {
  55                         initsOnReturn = initsOnReturn.mergedWith(flowInfo.unconditionalInits());
  56                 }
  57         }
  58 }