net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/InstanceOfExpression.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.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.ArrayBinding;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.Scope;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  22
  23
  24 public class InstanceOfExpression extends OperatorExpression {
  25
  26         public Expression expression;
  27         public TypeReference type;
  28
  29         public InstanceOfExpression(
  30                 Expression expression,
  31                 TypeReference type,
  32                 int operator) {
  33
  34                 this.expression = expression;
  35                 this.type = type;
  36                 this.bits |= operator << OperatorSHIFT;
  37                 this.sourceStart = expression.sourceStart;
  38                 this.sourceEnd = type.sourceEnd;
  39         }
  40
  41         public FlowInfo analyseCode(
  42                 BlockScope currentScope,
  43                 FlowContext flowContext,
  44                 FlowInfo flowInfo) {
  45
  46                 return expression
  47                         .analyseCode(currentScope, flowContext, flowInfo)
  48                         .unconditionalInits();
  49         }
  50
  51         public final boolean areTypesCastCompatible(
  52                 BlockScope scope,
  53                 TypeBinding castType,
  54                 TypeBinding expressionType) {
  55
  56                 //      see specifications p.68
  57                 //A more cpmplete version of this method is provided on
  58                 //CastExpression (it deals with constant and need runtime checkcast)
  59
  60                 if (castType == expressionType) return true;
  61
  62                 //by grammatical construction, the first test is ALWAYS false
  63                 //if (castTb.isBaseType())
  64                 //{     if (expressionTb.isBaseType())
  65                 //      {       if (expression.isConstantValueOfTypeAssignableToType(expressionTb,castTb))
  66                 //              {       return true;}
  67                 //              else
  68                 //              {       if (expressionTb==castTb)
  69                 //                      {       return true;}
  70                 //                      else
  71                 //                      {       if (scope.areTypesCompatible(expressionTb,castTb))
  72                 //                              {       return true; }
  73                 //
  74                 //                              if (BaseTypeBinding.isNarrowing(castTb.id,expressionTb.id))
  75                 //                              {       return true;}
  76                 //                              return false;}}}
  77                 //      else
  78                 //      {       return false; }}
  79                 //else
  80                 { //-------------checkcast to something which is NOT a basetype----------------------------------
  81
  82                         //null is compatible with every thing ....
  83                         if (NullBinding == expressionType) {
  84                                 return true;
  85                         }
  86                         if (expressionType.isArrayType()) {
  87                                 if (castType.isArrayType()) {
  88                                         //------- (castTb.isArray) expressionTb.isArray -----------
  89                                         TypeBinding expressionEltTb = ((ArrayBinding) expressionType).elementsType(scope);
  90                                         if (expressionEltTb.isBaseType())
  91                                                 // <---stop the recursion-------
  92                                                 return ((ArrayBinding) castType).elementsType(scope) == expressionEltTb;
  93                                         //recursivly on the elts...
  94                                         return areTypesCastCompatible(
  95                                                 scope,
  96                                                 ((ArrayBinding) castType).elementsType(scope),
  97                                                 expressionEltTb);
  98                                 }
  99                                 if (castType.isClass()) {
 100                                         //------(castTb.isClass) expressionTb.isArray ---------------
 101                                         if (scope.isJavaLangObject(castType))
 102                                                 return true;
 103                                         return false;
 104                                 }
 105                                 if (castType.isInterface()) {
 106                                         //------- (castTb.isInterface) expressionTb.isArray -----------
 107                                         if (scope.isJavaLangCloneable(castType) || scope.isJavaIoSerializable(castType)) {
 108                                                 return true;
 109                                         }
 110                                         return false;
 111                                 }
 112
 113                                 return false;
 114                         }
 115                         if (expressionType.isBaseType()) {
 116                                 return false;
 117                         }
 118                         if (expressionType.isClass()) {
 119                                 if (castType.isArrayType()) {
 120                                         // ---- (castTb.isArray) expressionTb.isClass -------
 121                                         if (scope.isJavaLangObject(expressionType)) {
 122                                                 return true;
 123                                         } else {
 124                                                 return false;
 125                                         }
 126                                 }
 127                                 if (castType.isClass()) { // ----- (castTb.isClass) expressionTb.isClass ------
 128                                         if (expressionType.isCompatibleWith(castType))
 129                                                 return true;
 130                                         else {
 131                                                 if (castType.isCompatibleWith(expressionType)) {
 132                                                         return true;
 133                                                 }
 134                                                 return false;
 135                                         }
 136                                 }
 137                                 if (castType.isInterface()) {
 138                                         // ----- (castTb.isInterface) expressionTb.isClass -------
 139                                         if (((ReferenceBinding) expressionType).isFinal()) {
 140                                                 //no subclass for expressionTb, thus compile-time check is valid
 141                                                 if (expressionType.isCompatibleWith(castType))
 142                                                         return true;
 143                                                 return false;
 144                                         } else {
 145                                                 return true;
 146                                         }
 147                                 }
 148
 149                                 return false;
 150                         }
 151                         if (expressionType.isInterface()) {
 152                                 if (castType.isArrayType()) {
 153                                         // ----- (castTb.isArray) expressionTb.isInterface ------
 154                                         if (scope.isJavaLangCloneable(expressionType)
 155                                                 || scope.isJavaIoSerializable(expressionType))
 156                                                 //potential runtime error
 157                                                 {
 158                                                 return true;
 159                                         }
 160                                         return false;
 161                                 }
 162                                 if (castType.isClass()) {
 163                                         // ----- (castTb.isClass) expressionTb.isInterface --------
 164                                         if (scope.isJavaLangObject(castType))
 165                                                 return true;
 166                                         if (((ReferenceBinding) castType).isFinal()) {
 167                                                 //no subclass for castTb, thus compile-time check is valid
 168                                                 if (castType.isCompatibleWith(expressionType)) {
 169                                                         return true;
 170                                                 }
 171                                                 return false;
 172                                         }
 173                                         return true;
 174                                 }
 175                                 if (castType.isInterface()) {
 176                                         // ----- (castTb.isInterface) expressionTb.isInterface -------
 177                                         if ((Scope.compareTypes(castType, expressionType) == NotRelated)) {
 178                                                 MethodBinding[] castTbMethods = ((ReferenceBinding) castType).methods();
 179                                                 int castTbMethodsLength = castTbMethods.length;
 180                                                 MethodBinding[] expressionTbMethods =
 181                                                         ((ReferenceBinding) expressionType).methods();
 182                                                 int expressionTbMethodsLength = expressionTbMethods.length;
 183                                                 for (int i = 0; i < castTbMethodsLength; i++) {
 184                                                         for (int j = 0; j < expressionTbMethodsLength; j++) {
 185                                                                 if (castTbMethods[i].selector == expressionTbMethods[j].selector) {
 186                                                                         if (castTbMethods[i].returnType != expressionTbMethods[j].returnType) {
 187                                                                                 if (castTbMethods[i].areParametersEqual(expressionTbMethods[j])) {
 188                                                                                         return false;
 189                                                                                 }
 190                                                                         }
 191                                                                 }
 192                                                         }
 193                                                 }
 194                                         }
 195                                         return true;
 196                                 }
 197
 198                                 return false;
 199                         }
 200
 201                         return false;
 202                 }
 203         }
 204         /**
 205          * Code generation for instanceOfExpression
 206          *
 207          * @param currentScope net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
 208          * @param codeStream net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
 209          * @param valueRequired boolean
 210         */
 211 //      public void generateCode(
 212 //              BlockScope currentScope,
 213 //              CodeStream codeStream,
 214 //              boolean valueRequired) {
 215 //
 216 //              int pc = codeStream.position;
 217 //              expression.generateCode(currentScope, codeStream, true);
 218 //              codeStream.instance_of(type.resolvedType);
 219 //              if (!valueRequired)
 220 //                      codeStream.pop();
 221 //              codeStream.recordPositionsFrom(pc, this.sourceStart);
 222 //      }
 223
 224         public TypeBinding resolveType(BlockScope scope) {
 225
 226                 constant = NotAConstant;
 227                 TypeBinding expressionType = expression.resolveType(scope);
 228                 TypeBinding checkType = type.resolveType(scope);
 229                 if (expressionType == null || checkType == null)
 230                         return null;
 231
 232                 if (!areTypesCastCompatible(scope, checkType, expressionType)) {
 233                         scope.problemReporter().notCompatibleTypesError(this, expressionType, checkType);
 234                         return null;
 235                 }
 236                 this.resolvedType = BooleanBinding;
 237                 return BooleanBinding;
 238         }
 239         public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
 240
 241                 expression.printExpression(indent, output).append(" instanceof "); //$NON-NLS-1$
 242                 return type.print(0, output);
 243         }
 244         public String toStringExpressionNoParenthesis() {
 245
 246                 return expression.toStringExpression() + " instanceof " + //$NON-NLS-1$
 247                 type.toString(0);
 248         }
 249
 250         public void traverse(ASTVisitor visitor, BlockScope scope) {
 251
 252                 if (visitor.visit(this, scope)) {
 253                         expression.traverse(visitor, scope);
 254                         type.traverse(visitor, scope);
 255                 }
 256                 visitor.endVisit(this, scope);
 257         }
 258 }