org.codehaus.groovy.transform.tailrec.ReturnAdderForClosures.groovy Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of groovy-all Show documentation
Show all versions of groovy-all Show documentation
Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.transform.tailrec
import org.codehaus.groovy.ast.*
import org.codehaus.groovy.ast.expr.ClosureExpression
import org.codehaus.groovy.classgen.ReturnAdder
/**
* Adds explicit return statements to implicit return points in a closure. This is necessary since
* tail-recursion is detected by having the recursive call within the return statement.
*
* @author Johannes Link
*/
class ReturnAdderForClosures extends CodeVisitorSupport {
synchronized void visitMethod(MethodNode method) {
method.code.visit(this)
}
public void visitClosureExpression(ClosureExpression expression) {
//Create a dummy method with the closure's code as the method's code. Then user ReturnAdder, which only works for methods.
MethodNode node = new MethodNode("dummy", 0, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, expression.code);
new ReturnAdder().visitMethod(node);
super.visitClosureExpression(expression)
}
}