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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.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.lookup.FieldBinding;
  14 import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
  15
  16 /**
  17  * Record conditional initialization status during definite assignment analysis
  18  *
  19  */
  20 public class ConditionalFlowInfo extends FlowInfo {
  21         public FlowInfo initsWhenTrue;
  22         public FlowInfo initsWhenFalse;
  23 ConditionalFlowInfo(FlowInfo initsWhenTrue, FlowInfo initsWhenFalse){
  24         this.initsWhenTrue = initsWhenTrue;
  25         this.initsWhenFalse = initsWhenFalse;
  26 }
  27 public UnconditionalFlowInfo addInitializationsFrom(UnconditionalFlowInfo otherInits) {
  28         return unconditionalInits().addInitializationsFrom(otherInits);
  29 }
  30 public UnconditionalFlowInfo addPotentialInitializationsFrom(UnconditionalFlowInfo otherInits) {
  31         return unconditionalInits().addPotentialInitializationsFrom(otherInits);
  32 }
  33 public FlowInfo asNegatedCondition() {
  34         FlowInfo extra = initsWhenTrue;
  35         initsWhenTrue = initsWhenFalse;
  36         initsWhenFalse = extra;
  37         return this;
  38 }
  39 public FlowInfo copy() {
  40         return new ConditionalFlowInfo(initsWhenTrue.copy(), initsWhenFalse.copy());
  41 }
  42 public FlowInfo initsWhenFalse() {
  43         return initsWhenFalse;
  44 }
  45 public FlowInfo initsWhenTrue() {
  46         return initsWhenTrue;
  47 }
  48 /**
  49  * Check status of definite assignment for a field.
  50  */
  51 public boolean isDefinitelyAssigned(FieldBinding field) {
  52         return initsWhenTrue.isDefinitelyAssigned(field)
  53                         && initsWhenFalse.isDefinitelyAssigned(field);
  54
  55 }
  56 /**
  57  * Check status of definite assignment for a local variable.
  58  */
  59 public boolean isDefinitelyAssigned(LocalVariableBinding local) {
  60         return initsWhenTrue.isDefinitelyAssigned(local)
  61                         && initsWhenFalse.isDefinitelyAssigned(local);
  62
  63 }
  64 public boolean isFakeReachable(){
  65         return unconditionalInits().isFakeReachable();
  66         //should maybe directly be: false
  67 }
  68 /**
  69  * Check status of potential assignment for a field.
  70  */
  71 public boolean isPotentiallyAssigned(FieldBinding field) {
  72         return initsWhenTrue.isPotentiallyAssigned(field)
  73                         || initsWhenFalse.isPotentiallyAssigned(field);
  74
  75 }
  76 /**
  77  * Check status of potential assignment for a local variable.
  78  */
  79 public boolean isPotentiallyAssigned(LocalVariableBinding local) {
  80         return initsWhenTrue.isPotentiallyAssigned(local)
  81                         || initsWhenFalse.isPotentiallyAssigned(local);
  82
  83 }
  84 /**
  85  * Record a field got definitely assigned.
  86  */
  87 public void markAsDefinitelyAssigned(FieldBinding field) {
  88         initsWhenTrue.markAsDefinitelyAssigned(field);
  89         initsWhenFalse.markAsDefinitelyAssigned(field);
  90 }
  91 /**
  92  * Record a field got definitely assigned.
  93  */
  94 public void markAsDefinitelyAssigned(LocalVariableBinding local) {
  95         initsWhenTrue.markAsDefinitelyAssigned(local);
  96         initsWhenFalse.markAsDefinitelyAssigned(local);
  97 }
  98 /**
  99  * Clear the initialization info for a field
 100  */
 101 public void markAsDefinitelyNotAssigned(FieldBinding field) {
 102         initsWhenTrue.markAsDefinitelyNotAssigned(field);
 103         initsWhenFalse.markAsDefinitelyNotAssigned(field);
 104 }
 105 /**
 106  * Clear the initialization info for a local variable
 107  */
 108 public void markAsDefinitelyNotAssigned(LocalVariableBinding local) {
 109         initsWhenTrue.markAsDefinitelyNotAssigned(local);
 110         initsWhenFalse.markAsDefinitelyNotAssigned(local);
 111 }
 112 public FlowInfo markAsFakeReachable(boolean isFakeReachable) {
 113         initsWhenTrue.markAsFakeReachable(isFakeReachable);
 114         initsWhenFalse.markAsFakeReachable(isFakeReachable);
 115         return this;
 116 }
 117 public UnconditionalFlowInfo mergedWith(UnconditionalFlowInfo otherInits) {
 118         return unconditionalInits().mergedWith(otherInits);
 119 }
 120 public String toString() {
 121         return "FlowInfo<true: " + initsWhenTrue.toString() + ", false: " + initsWhenFalse.toString() + ">"; //$NON-NLS-1$ //$NON-NLS-3$ //$NON-NLS-2$
 122 }
 123 public UnconditionalFlowInfo unconditionalInits() {
 124         return initsWhenTrue.unconditionalInits().copy()
 125                         .mergedWith(initsWhenFalse.unconditionalInits());
 126 }
 127 }