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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.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.ArrayBinding;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.Scope;
  22 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  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 castTb,
  54                 TypeBinding expressionTb) {
  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                 //by grammatical construction, the first test is ALWAYS false
  61                 //if (castTb.isBaseType())
  62                 //{     if (expressionTb.isBaseType())
  63                 //      {       if (expression.isConstantValueOfTypeAssignableToType(expressionTb,castTb))
  64                 //              {       return true;}
  65                 //              else
  66                 //              {       if (expressionTb==castTb)
  67                 //                      {       return true;}
  68                 //                      else
  69                 //                      {       if (scope.areTypesCompatible(expressionTb,castTb))
  70                 //                              {       return true; }
  71                 //
  72                 //                              if (BaseTypeBinding.isNarrowing(castTb.id,expressionTb.id))
  73                 //                              {       return true;}
  74                 //                              return false;}}}
  75                 //      else
  76                 //      {       return false; }}
  77                 //else
  78                 { //-------------checkcast to something which is NOT a basetype----------------------------------
  79
  80                         if (NullBinding == expressionTb)
  81                                 //null is compatible with every thing ....
  82                                 {
  83                                 return true;
  84                         }
  85                         if (expressionTb.isArrayType()) {
  86                                 if (castTb.isArrayType()) {
  87                                         //------- (castTb.isArray) expressionTb.isArray -----------
  88                                         TypeBinding expressionEltTb = ((ArrayBinding) expressionTb).elementsType(scope);
  89                                         if (expressionEltTb.isBaseType())
  90                                                 // <---stop the recursion-------
  91                                                 return ((ArrayBinding) castTb).elementsType(scope) == expressionEltTb;
  92                                         //recursivly on the elts...
  93                                         return areTypesCastCompatible(
  94                                                 scope,
  95                                                 ((ArrayBinding) castTb).elementsType(scope),
  96                                                 expressionEltTb);
  97                                 }
  98                                 if (castTb.isClass()) {
  99                                         //------(castTb.isClass) expressionTb.isArray ---------------
 100                                         if (scope.isJavaLangObject(castTb))
 101                                                 return true;
 102                                         return false;
 103                                 }
 104                                 if (castTb.isInterface()) {
 105                                         //------- (castTb.isInterface) expressionTb.isArray -----------
 106                                         if (scope.isJavaLangCloneable(castTb) || scope.isJavaIoSerializable(castTb)) {
 107                                                 return true;
 108                                         }
 109                                         return false;
 110                                 }
 111
 112                                 return false;
 113                         }
 114                         if (expressionTb.isBaseType()) {
 115                                 return false;
 116                         }
 117                         if (expressionTb.isClass()) {
 118                                 if (castTb.isArrayType()) {
 119                                         // ---- (castTb.isArray) expressionTb.isClass -------
 120                                         if (scope.isJavaLangObject(expressionTb)) {
 121                                                 return true;
 122                                         } else {
 123                                                 return false;
 124                                         }
 125                                 }
 126                                 if (castTb.isClass()) { // ----- (castTb.isClass) expressionTb.isClass ------
 127                                         if (BlockScope.areTypesCompatible(expressionTb, castTb))
 128                                                 return true;
 129                                         else {
 130                                                 if (BlockScope.areTypesCompatible(castTb, expressionTb)) {
 131                                                         return true;
 132                                                 }
 133                                                 return false;
 134                                         }
 135                                 }
 136                                 if (castTb.isInterface()) {
 137                                         // ----- (castTb.isInterface) expressionTb.isClass -------
 138                                         if (((ReferenceBinding) expressionTb).isFinal()) {
 139                                                 //no subclass for expressionTb, thus compile-time check is valid
 140                                                 if (BlockScope.areTypesCompatible(expressionTb, castTb))
 141                                                         return true;
 142                                                 return false;
 143                                         } else {
 144                                                 return true;
 145                                         }
 146                                 }
 147
 148                                 return false;
 149                         }
 150                         if (expressionTb.isInterface()) {
 151                                 if (castTb.isArrayType()) {
 152                                         // ----- (castTb.isArray) expressionTb.isInterface ------
 153                                         if (scope.isJavaLangCloneable(expressionTb)
 154                                                 || scope.isJavaIoSerializable(expressionTb))
 155                                                 //potential runtime error
 156                                                 {
 157                                                 return true;
 158                                         }
 159                                         return false;
 160                                 }
 161                                 if (castTb.isClass()) {
 162                                         // ----- (castTb.isClass) expressionTb.isInterface --------
 163                                         if (scope.isJavaLangObject(castTb))
 164                                                 return true;
 165                                         if (((ReferenceBinding) castTb).isFinal()) {
 166                                                 //no subclass for castTb, thus compile-time check is valid
 167                                                 if (BlockScope.areTypesCompatible(castTb, expressionTb)) {
 168                                                         return true;
 169                                                 }
 170                                                 return false;
 171                                         }
 172                                         return true;
 173                                 }
 174                                 if (castTb.isInterface()) {
 175                                         // ----- (castTb.isInterface) expressionTb.isInterface -------
 176                                         if (castTb != expressionTb
 177                                                 && (Scope.compareTypes(castTb, expressionTb) == NotRelated)) {
 178                                                 MethodBinding[] castTbMethods = ((ReferenceBinding) castTb).methods();
 179                                                 int castTbMethodsLength = castTbMethods.length;
 180                                                 MethodBinding[] expressionTbMethods =
 181                                                         ((ReferenceBinding) expressionTb).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 org.eclipse.jdt.internal.compiler.lookup.BlockScope
 208          * @param codeStream org.eclipse.jdt.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.binding);
 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 expressionTb = expression.resolveType(scope);
 228                 TypeBinding checkTb = type.resolveType(scope);
 229                 if (expressionTb == null || checkTb == null)
 230                         return null;
 231
 232                 if (!areTypesCastCompatible(scope, checkTb, expressionTb)) {
 233                         scope.problemReporter().notCompatibleTypesError(this, expressionTb, checkTb);
 234                         return null;
 235                 }
 236                 this.typeBinding = BooleanBinding;
 237                 return BooleanBinding;
 238         }
 239
 240         public String toStringExpressionNoParenthesis() {
 241
 242                 return expression.toStringExpression() + " instanceof " + //$NON-NLS-1$
 243                 type.toString(0);
 244         }
 245
 246         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 247
 248                 if (visitor.visit(this, scope)) {
 249                         expression.traverse(visitor, scope);
 250                         type.traverse(visitor, scope);
 251                 }
 252                 visitor.endVisit(this, scope);
 253         }
 254 }