001/*
002 * Copyright (c) 2009, 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.java;
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.*;
031import com.oracle.graal.nodes.memory.*;
032import com.oracle.graal.nodes.spi.*;
033
034/**
035 * The entry to an exception handler with the exception coming from a call (as opposed to a local
036 * throw instruction or implicit exception).
037 */
038@NodeInfo(allowedUsageTypes = {InputType.Memory})
039public final class ExceptionObjectNode extends DispatchBeginNode implements Lowerable, MemoryCheckpoint.Single {
040    public static final NodeClass<ExceptionObjectNode> TYPE = NodeClass.create(ExceptionObjectNode.class);
041
042    public ExceptionObjectNode(MetaAccessProvider metaAccess) {
043        super(TYPE, StampFactory.declaredNonNull(metaAccess.lookupJavaType(Throwable.class)));
044    }
045
046    @Override
047    public LocationIdentity getLocationIdentity() {
048        return LocationIdentity.any();
049    }
050
051    @Override
052    public void lower(LoweringTool tool) {
053        if (graph().getGuardsStage() == StructuredGraph.GuardsStage.FIXED_DEOPTS) {
054            /*
055             * Now the lowering to BeginNode+LoadExceptionNode can be performed, since no more
056             * deopts can float in between the begin node and the load exception node.
057             */
058            LocationIdentity locationsKilledByInvoke = ((InvokeWithExceptionNode) predecessor()).getLocationIdentity();
059            AbstractBeginNode entry = graph().add(new KillingBeginNode(locationsKilledByInvoke));
060            LoadExceptionObjectNode loadException = graph().add(new LoadExceptionObjectNode(stamp()));
061
062            loadException.setStateAfter(stateAfter());
063            replaceAtUsages(InputType.Value, loadException);
064            graph().replaceFixedWithFixed(this, entry);
065            entry.graph().addAfterFixed(entry, loadException);
066
067            loadException.lower(tool);
068        }
069    }
070
071    @Override
072    public boolean verify() {
073        assertTrue(stateAfter() != null, "an exception handler needs a frame state");
074        return super.verify();
075    }
076}