/*
 * Copyright (c) 2011, 2015, 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 org.graalvm.compiler.nodes.extended;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;

import org.graalvm.compiler.core.common.type.ObjectStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.Canonicalizable;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.FloatingNode;
import org.graalvm.compiler.nodes.spi.Lowerable;
import org.graalvm.compiler.nodes.spi.LoweringTool;
import org.graalvm.compiler.nodes.spi.Virtualizable;
import org.graalvm.compiler.nodes.spi.VirtualizerTool;
import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;

import jdk.vm.ci.meta.Constant;
import jdk.vm.ci.meta.ConstantReflectionProvider;
import jdk.vm.ci.meta.MetaAccessProvider;

Loads an object's class (i.e., this node can be created for object.getClass()).
/** * Loads an object's class (i.e., this node can be created for {@code object.getClass()}). */
@NodeInfo(cycles = CYCLES_2, size = SIZE_1) public final class GetClassNode extends FloatingNode implements Lowerable, Canonicalizable, Virtualizable { public static final NodeClass<GetClassNode> TYPE = NodeClass.create(GetClassNode.class); @Input ValueNode object; public ValueNode getObject() { return object; } public GetClassNode(Stamp stamp, ValueNode object) { super(TYPE, stamp); this.object = object; assert ((ObjectStamp) object.stamp()).nonNull(); } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } public static ValueNode tryFold(MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection, ValueNode object) { if (metaAccess != null && object != null && object.stamp() instanceof ObjectStamp) { ObjectStamp objectStamp = (ObjectStamp) object.stamp(); if (objectStamp.isExactType()) { return ConstantNode.forConstant(constantReflection.asJavaClass(objectStamp.type()), metaAccess); } } return null; } @Override public ValueNode canonical(CanonicalizerTool tool) { ValueNode folded = tryFold(tool.getMetaAccess(), tool.getConstantReflection(), getObject()); return folded == null ? this : folded; } @Override public void virtualize(VirtualizerTool tool) { ValueNode alias = tool.getAlias(getObject()); if (alias instanceof VirtualObjectNode) { VirtualObjectNode virtual = (VirtualObjectNode) alias; Constant javaClass = tool.getConstantReflectionProvider().asJavaClass(virtual.type()); tool.replaceWithValue(ConstantNode.forConstant(stamp(), javaClass, tool.getMetaAccessProvider(), graph())); } } }