net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/flow/SwitchFlowContext.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 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
  15
  16 /**
  17  * Reflects the context of code analysis, keeping track of enclosing
  18  *      try statements, exception handlers, etc...
  19  */
  20 public class SwitchFlowContext extends FlowContext {
  21         public Label breakLabel;
  22         public UnconditionalFlowInfo initsOnBreak = FlowInfo.DEAD_END;
  23
  24         public SwitchFlowContext(
  25                 FlowContext parent,
  26                 ASTNode associatedNode,
  27                 Label breakLabel) {
  28                 super(parent, associatedNode);
  29                 this.breakLabel = breakLabel;
  30         }
  31
  32         public Label breakLabel() {
  33                 return breakLabel;
  34         }
  35
  36         public String individualToString() {
  37                 StringBuffer buffer = new StringBuffer("Switch flow context"); //$NON-NLS-1$
  38                 buffer.append("[initsOnBreak -").append(initsOnBreak.toString()).append(']'); //$NON-NLS-1$
  39                 return buffer.toString();
  40         }
  41
  42         public boolean isBreakable() {
  43                 return true;
  44         }
  45
  46         public void recordBreakFrom(FlowInfo flowInfo) {
  47
  48                 if (initsOnBreak == FlowInfo.DEAD_END) {
  49                         initsOnBreak = flowInfo.copy().unconditionalInits();
  50                 } else {
  51                         initsOnBreak = initsOnBreak.mergedWith(flowInfo.unconditionalInits());
  52                 };
  53         }
  54 }