| /******************************************************************************* |
| * Copyright (c) 2000, 2008 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.wst.jsdt.internal.compiler.ast; |
| |
| import org.eclipse.wst.jsdt.core.ast.IASTNode; |
| import org.eclipse.wst.jsdt.core.ast.IInstanceOfExpression; |
| import org.eclipse.wst.jsdt.internal.compiler.ASTVisitor; |
| import org.eclipse.wst.jsdt.internal.compiler.flow.FlowContext; |
| import org.eclipse.wst.jsdt.internal.compiler.flow.FlowInfo; |
| import org.eclipse.wst.jsdt.internal.compiler.impl.Constant; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.BlockScope; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.LocalVariableBinding; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.Scope; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.TagBits; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.TypeBinding; |
| |
| public class InstanceOfExpression extends OperatorExpression implements IInstanceOfExpression { |
| |
| public Expression expression; |
| public TypeReference type; |
| |
| public InstanceOfExpression(Expression expression, TypeReference type) { |
| |
| this.expression = expression; |
| this.type = type; |
| type.bits |= IgnoreRawTypeCheck; // no need to worry about raw type usage |
| this.bits |= INSTANCEOF << OperatorSHIFT; |
| this.sourceStart = expression.sourceStart; |
| this.sourceEnd = type.sourceEnd; |
| } |
| |
| public FlowInfo analyseCode( |
| BlockScope currentScope, |
| FlowContext flowContext, |
| FlowInfo flowInfo) { |
| LocalVariableBinding local = this.expression.localVariableBinding(); |
| if (local != null && (local.type.tagBits & TagBits.IsBaseType) == 0) { |
| flowContext.recordUsingNullReference(currentScope, local, |
| this.expression, FlowContext.CAN_ONLY_NULL, flowInfo); |
| flowInfo = expression.analyseCode(currentScope, flowContext, flowInfo). |
| unconditionalInits(); |
| FlowInfo initsWhenTrue = flowInfo.copy(); |
| initsWhenTrue.markAsComparedEqualToNonNull(local); |
| // no impact upon enclosing try context |
| return FlowInfo.conditional(initsWhenTrue, flowInfo.copy()); |
| } |
| return expression.analyseCode(currentScope, flowContext, flowInfo). |
| unconditionalInits(); |
| } |
| |
| public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) { |
| |
| expression.printExpression(indent, output).append(" instanceof "); //$NON-NLS-1$ |
| return type.print(0, output); |
| } |
| |
| public TypeBinding resolveType(BlockScope scope) { |
| |
| constant = Constant.NotAConstant; |
| TypeBinding expressionType = expression.resolveType(scope); |
| TypeBinding checkedType = type.resolveType(scope, true /* check bounds*/); |
| if (expressionType == null || checkedType == null) |
| return null; |
| |
| if (!checkedType.isReifiable()) { |
| scope.problemReporter().illegalInstanceOfGenericType(checkedType, this); |
| } else if ((expressionType != TypeBinding.NULL && expressionType.isBaseType()) // disallow autoboxing |
| || !checkCastTypesCompatibility(scope, checkedType, expressionType, null)) { |
| scope.problemReporter().notCompatibleTypesError(this, expressionType, checkedType); |
| } |
| return this.resolvedType = TypeBinding.BOOLEAN; |
| } |
| /** |
| * @see org.eclipse.wst.jsdt.internal.compiler.ast.Expression#tagAsUnnecessaryCast(Scope,TypeBinding) |
| */ |
| public void tagAsUnnecessaryCast(Scope scope, TypeBinding castType) { |
| // null is not instanceof Type, recognize direct scenario |
| if (expression.resolvedType != TypeBinding.NULL) |
| scope.problemReporter().unnecessaryInstanceof(this, castType); |
| } |
| public void traverse(ASTVisitor visitor, BlockScope scope) { |
| |
| if (visitor.visit(this, scope)) { |
| expression.traverse(visitor, scope); |
| type.traverse(visitor, scope); |
| } |
| visitor.endVisit(this, scope); |
| } |
| public int getASTType() { |
| return IASTNode.INSTANCEOF_EXPRESSION; |
| |
| } |
| } |