net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/lookup/LocalVariableBinding.java

   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.lookup;
  12
  13 import net.sourceforge.phpdt.internal.compiler.ast.LocalDeclaration;
  14 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  15
  16 public class LocalVariableBinding extends VariableBinding {
  17         public boolean isArgument;
  18
  19         public int resolvedPosition; // for code generation (position in method context)
  20         public boolean used; // for flow analysis
  21         public BlockScope declaringScope; // back-pointer to its declaring scope
  22         public LocalDeclaration declaration; // for source-positions
  23
  24         public int[] initializationPCs;
  25         public int initializationCount = 0;
  26
  27 // for synthetic local variables
  28 public LocalVariableBinding(char[] name, TypeBinding type, int modifiers, boolean isArgument) {
  29         this.name = name;
  30         this.type = type;
  31         this.modifiers = modifiers;
  32         if (this.isArgument = isArgument)
  33                 this.constant = Constant.NotAConstant;
  34 }
  35
  36 // regular local variable or argument
  37 public LocalVariableBinding(LocalDeclaration declaration, TypeBinding type, int modifiers, boolean isArgument) {
  38         this(declaration.name, type, modifiers, isArgument);
  39         this.declaration = declaration;
  40 }
  41 /* API
  42 * Answer the receiver's binding type from Binding.BindingID.
  43 */
  44
  45 public final int bindingType() {
  46         return LOCAL;
  47 }
  48 // Answer whether the variable binding is a secret variable added for code gen purposes
  49
  50 public boolean isSecret() {
  51         return declaration == null && !isArgument;
  52 }
  53 public void recordInitializationEndPC(int pc) {
  54         if (initializationPCs[((initializationCount - 1) << 1) + 1] == -1)
  55                 initializationPCs[((initializationCount - 1) << 1) + 1] = pc;
  56 }
  57 public void recordInitializationStartPC(int pc) {
  58         if (initializationPCs == null)
  59                 return;
  60         // optimize cases where reopening a contiguous interval
  61         if ((initializationCount > 0) && (initializationPCs[ ((initializationCount - 1) << 1) + 1] == pc)) {
  62                 initializationPCs[ ((initializationCount - 1) << 1) + 1] = -1; // reuse previous interval (its range will be augmented)
  63         } else {
  64                 int index = initializationCount << 1;
  65                 if (index == initializationPCs.length) {
  66                         System.arraycopy(initializationPCs, 0, (initializationPCs = new int[initializationCount << 2]), 0, index);
  67                 }
  68                 initializationPCs[index] = pc;
  69                 initializationPCs[index + 1] = -1;
  70                 initializationCount++;
  71         }
  72 }
  73 public String toString() {
  74         String s = super.toString();
  75         if (!used)
  76                 s += "[pos: unused]"; //$NON-NLS-1$
  77         else
  78                 s += "[pos: " + String.valueOf(resolvedPosition) + "]"; //$NON-NLS-2$ //$NON-NLS-1$
  79         s += "[id:" + String.valueOf(id) + "]"; //$NON-NLS-2$ //$NON-NLS-1$
  80         if (initializationCount > 0) {
  81                 s += "[pc: "; //$NON-NLS-1$
  82                 for (int i = 0; i < initializationCount; i++) {
  83                         if (i > 0)
  84                                 s += ", "; //$NON-NLS-1$
  85                         s += String.valueOf(initializationPCs[i << 1]) + "-" + ((initializationPCs[(i << 1) + 1] == -1) ? "?" : String.valueOf(initializationPCs[(i<< 1) + 1])); //$NON-NLS-2$ //$NON-NLS-1$
  86                 }
  87                 s += "]"; //$NON-NLS-1$
  88         }
  89         return s;
  90 }
  91 }