001/*
002 * Copyright (c) 2013, 2014, 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.hotspot.replacements;
024
025import jdk.internal.jvmci.hotspot.*;
026import jdk.internal.jvmci.meta.*;
027
028import com.oracle.graal.graph.*;
029import com.oracle.graal.graph.spi.*;
030import com.oracle.graal.nodeinfo.*;
031import com.oracle.graal.nodes.CallTargetNode.InvokeKind;
032import com.oracle.graal.nodes.*;
033import com.oracle.graal.nodes.spi.*;
034import com.oracle.graal.replacements.nodes.*;
035
036@NodeInfo
037public final class CallSiteTargetNode extends MacroStateSplitNode implements Canonicalizable, Lowerable {
038
039    public static final NodeClass<CallSiteTargetNode> TYPE = NodeClass.create(CallSiteTargetNode.class);
040
041    public CallSiteTargetNode(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, JavaType returnType, ValueNode receiver) {
042        super(TYPE, invokeKind, targetMethod, bci, returnType, receiver);
043    }
044
045    private ValueNode getCallSite() {
046        return arguments.get(0);
047    }
048
049    public static ConstantNode tryFold(ValueNode callSite, MetaAccessProvider metaAccess, Assumptions assumptions) {
050        if (callSite != null && callSite.isConstant() && !callSite.isNullConstant()) {
051            HotSpotObjectConstant c = (HotSpotObjectConstant) callSite.asConstant();
052            JavaConstant target = c.getCallSiteTarget(assumptions);
053            if (target != null) {
054                return ConstantNode.forConstant(target, metaAccess);
055            }
056        }
057        return null;
058    }
059
060    @Override
061    public Node canonical(CanonicalizerTool tool) {
062        ConstantNode target = tryFold(getCallSite(), tool.getMetaAccess(), graph().getAssumptions());
063        if (target != null) {
064            return target;
065        }
066
067        return this;
068    }
069
070    @Override
071    public void lower(LoweringTool tool) {
072        ConstantNode target = tryFold(getCallSite(), tool.getMetaAccess(), graph().getAssumptions());
073
074        if (target != null) {
075            graph().replaceFixedWithFloating(this, target);
076        } else {
077            InvokeNode invoke = createInvoke();
078            graph().replaceFixedWithFixed(this, invoke);
079            invoke.lower(tool);
080        }
081    }
082}