Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLReturnNode.java @ 18125:2a69cbe850a8
Reduce diff with upstream
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Mon, 20 Oct 2014 19:07:20 +0200 |
parents | abe7128ca473 |
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/* * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.truffle.sl.nodes.controlflow; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.api.source.*; import com.oracle.truffle.sl.nodes.*; import com.oracle.truffle.sl.runtime.*; /** * Implementation of the SL return statement. We need to unwind an unknown number of interpreter * frames that are between this {@link SLReturnNode} and the {@link SLFunctionBodyNode} of the * method we are exiting. This is done by throwing an {@link SLReturnException exception} that is * caught by the {@link SLFunctionBodyNode#executeGeneric function body}. The exception transports * the return value. */ @NodeInfo(shortName = "return", description = "The node implementing a return statement") public final class SLReturnNode extends SLStatementNode { @Child private SLExpressionNode valueNode; public SLReturnNode(SourceSection src, SLExpressionNode valueNode) { super(src); this.valueNode = valueNode; } @Override public void executeVoid(VirtualFrame frame) { Object result; if (valueNode != null) { result = valueNode.executeGeneric(frame); } else { /* Return statement that was not followed by an expression, so return the SL null value. */ result = SLNull.SINGLETON; } throw new SLReturnException(result); } }