| /******************************************************************************* |
| * Copyright (c) 2000, 2014 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Fraunhofer FIRST - extended API and implementation |
| * Technical University Berlin - extended API and implementation |
| * Stephan Herrmann - Contributions for |
| * bug 359334 - Analysis for resource leak warnings does not consider exceptions as method exit points |
| * bug 368546 - [compiler][resource] Avoid remaining false positives found when compiling the Eclipse SDK |
| * bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null" |
| * Bug 429430 - [1.8] Lambdas and method reference infer wrong exception type with generics (RuntimeException instead of IOException) |
| *******************************************************************************/ |
| 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.ReferenceBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeIds; |
| import org.eclipse.objectteams.otdt.internal.core.compiler.control.Config; |
| import org.eclipse.objectteams.otdt.internal.core.compiler.lifting.Lowering; |
| |
| /** |
| * OTDT changes: |
| * What: support throwing of a role of an exception (using lowering) |
| * |
| */ |
| 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; |
| } |
| |
| @Override |
| 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); |
| currentScope.checkUnclosedCloseables(flowInfo, flowContext, this, currentScope); |
| flowContext.recordAbruptExit(); |
| 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 |
| */ |
| @Override |
| 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); |
| } |
| |
| @Override |
| public StringBuffer printStatement(int indent, StringBuffer output) { |
| printIndent(indent, output).append("throw "); //$NON-NLS-1$ |
| this.exception.printExpression(0, output); |
| return output.append(';'); |
| } |
| |
| @Override |
| public void resolve(BlockScope scope) { |
| this.exceptionType = this.exception.resolveType(scope); |
| if (this.exceptionType != null && this.exceptionType.isValidBinding()) { |
| //{ObjectTeams: lowering roles of exceptions: |
| if (this.exceptionType.isRole()) { |
| Config.requireTypeAdjustment(); // reset |
| if ( this.exceptionType.isCompatibleWith(scope.getJavaLangThrowable()) |
| && Config.getLoweringRequired()) |
| { |
| // Note: lowering might still be needed somewhere _within_ the expression, re-check: |
| if (this.exceptionType.isRole()) { |
| ReferenceBinding roleType = ((ReferenceBinding)this.exceptionType).getRealType(); |
| if (!roleType.isCompatibleWith(scope.getJavaLangThrowable())) |
| { |
| ReferenceBinding expectedExceptionType = roleType.baseclass(); |
| this.exception = new Lowering().lowerExpression(scope, |
| this.exception, |
| this.exceptionType, |
| expectedExceptionType, |
| null /*teamExpression*/, |
| true /*needNullCheck*/); |
| this.exceptionType = roleType.baseclass(); |
| } |
| } |
| } |
| } |
| // SH} |
| 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); |
| } |
| } |
| |
| @Override |
| public void traverse(ASTVisitor visitor, BlockScope blockScope) { |
| if (visitor.visit(this, blockScope)) |
| this.exception.traverse(visitor, blockScope); |
| visitor.endVisit(this, blockScope); |
| } |
| |
| @Override |
| public boolean doesNotCompleteNormally() { |
| return true; |
| } |
| } |