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.nodes;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.graph.*;
028import com.oracle.graal.graph.spi.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.CallTargetNode.InvokeKind;
031import com.oracle.graal.nodes.*;
032import com.oracle.graal.nodes.java.*;
033import com.oracle.graal.replacements.nodes.*;
034
035/**
036 * {@link MacroNode Macro node} for {@link Class#cast(Object)}.
037 */
038@NodeInfo
039public final class ClassCastNode extends MacroStateSplitNode implements Canonicalizable.Binary<ValueNode> {
040
041    public static final NodeClass<ClassCastNode> TYPE = NodeClass.create(ClassCastNode.class);
042
043    public ClassCastNode(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, JavaType returnType, ValueNode receiver, ValueNode object) {
044        super(TYPE, invokeKind, targetMethod, bci, returnType, receiver, object);
045    }
046
047    private ValueNode getJavaClass() {
048        return arguments.get(0);
049    }
050
051    private ValueNode getObject() {
052        return arguments.get(1);
053    }
054
055    public ValueNode getX() {
056        return getJavaClass();
057    }
058
059    public ValueNode getY() {
060        return getObject();
061    }
062
063    @Override
064    public ValueNode canonical(CanonicalizerTool tool, ValueNode forJavaClass, ValueNode forObject) {
065        ValueNode folded = tryFold(forJavaClass, forObject, tool.getConstantReflection(), null);
066        return folded != null ? folded : this;
067    }
068
069    public static ValueNode tryFold(ValueNode javaClass, ValueNode object, ConstantReflectionProvider constantReflection, Assumptions assumptions) {
070        if (javaClass != null && javaClass.isConstant()) {
071            ResolvedJavaType type = constantReflection.asJavaType(javaClass.asConstant());
072            if (type != null && !type.isPrimitive()) {
073                return CheckCastNode.create(type, object, null, false, assumptions);
074            }
075        }
076        return null;
077    }
078}