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
    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)
/*******************************************************************************
 * 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
 *     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.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;
}

@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
Params:
currentScope – org.eclipse.jdt.internal.compiler.lookup.BlockScope
codeStream – org.eclipse.jdt.internal.compiler.codegen.CodeStream/**
 * 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()) {
		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;
}
}