| /******************************************************************************* |
| * Copyright (c) 2000, 2009 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.jdt.internal.compiler.ast; |
| |
| import org.eclipse.jdt.internal.compiler.ASTVisitor; |
| import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants; |
| import org.eclipse.jdt.internal.compiler.codegen.CodeStream; |
| import org.eclipse.jdt.internal.compiler.flow.FlowContext; |
| import org.eclipse.jdt.internal.compiler.flow.FlowInfo; |
| import org.eclipse.jdt.internal.compiler.lookup.BlockScope; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeIds; |
| |
| public class ThrowStatement extends Statement { |
| |
| public Expression exception; |
| public TypeBinding exceptionType; |
| |
| public ThrowStatement(Expression exception, int sourceStart, int sourceEnd) { |
| this.exception = exception; |
| this.sourceStart = sourceStart; |
| this.sourceEnd = sourceEnd; |
| } |
| |
| public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { |
| this.exception.analyseCode(currentScope, flowContext, flowInfo); |
| this.exception.checkNPE(currentScope, flowContext, flowInfo); |
| // need to check that exception thrown is actually caught somewhere |
| flowContext.checkExceptionHandlers(this.exceptionType, this, flowInfo, currentScope); |
| return FlowInfo.DEAD_END; |
| } |
| |
| /** |
| * Throw code generation |
| * |
| * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope |
| * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream |
| */ |
| public void generateCode(BlockScope currentScope, CodeStream codeStream) { |
| if ((this.bits & ASTNode.IsReachable) == 0) |
| return; |
| int pc = codeStream.position; |
| this.exception.generateCode(currentScope, codeStream, true); |
| codeStream.athrow(); |
| codeStream.recordPositionsFrom(pc, this.sourceStart); |
| } |
| |
| public StringBuffer printStatement(int indent, StringBuffer output) { |
| printIndent(indent, output).append("throw "); //$NON-NLS-1$ |
| this.exception.printExpression(0, output); |
| return output.append(';'); |
| } |
| |
| public void resolve(BlockScope scope) { |
| this.exceptionType = this.exception.resolveType(scope); |
| if (this.exceptionType != null && this.exceptionType.isValidBinding()) { |
| if (this.exceptionType == TypeBinding.NULL) { |
| if (scope.compilerOptions().complianceLevel <= ClassFileConstants.JDK1_3){ |
| // if compliant with 1.4, this problem will not be reported |
| scope.problemReporter().cannotThrowNull(this.exception); |
| } |
| } else if (this.exceptionType.findSuperTypeOriginatingFrom(TypeIds.T_JavaLangThrowable, true) == null) { |
| scope.problemReporter().cannotThrowType(this.exception, this.exceptionType); |
| } |
| this.exception.computeConversion(scope, this.exceptionType, this.exceptionType); |
| } |
| } |
| |
| public void traverse(ASTVisitor visitor, BlockScope blockScope) { |
| if (visitor.visit(this, blockScope)) |
| this.exception.traverse(visitor, blockScope); |
| visitor.endVisit(this, blockScope); |
| } |
| } |