001/*
002 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.spi.*;
031
032/**
033 * Unwinds the current frame to an exception handler in the caller frame.
034 */
035@NodeInfo
036public final class UnwindNode extends ControlSinkNode implements Lowerable, LIRLowerable {
037
038    public static final NodeClass<UnwindNode> TYPE = NodeClass.create(UnwindNode.class);
039    @Input ValueNode exception;
040
041    public ValueNode exception() {
042        return exception;
043    }
044
045    public UnwindNode(ValueNode exception) {
046        super(TYPE, StampFactory.forVoid());
047        assert exception.getKind() == Kind.Object;
048        this.exception = exception;
049    }
050
051    @Override
052    public void lower(LoweringTool tool) {
053        tool.getLowerer().lower(this, tool);
054    }
055
056    @Override
057    public void generate(NodeLIRBuilderTool gen) {
058        gen.getLIRGeneratorTool().emitUnwind(gen.operand(exception()));
059    }
060}