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