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 * 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.
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 * 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.
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package org.graalvm.compiler.nodes.java;

import java.lang.ref.Reference;
import java.util.Collections;

import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.core.common.type.TypeReference;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.FrameState;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.spi.VirtualizableAllocation;
import org.graalvm.compiler.nodes.spi.VirtualizerTool;
import org.graalvm.compiler.nodes.virtual.VirtualInstanceNode;

import jdk.vm.ci.meta.ResolvedJavaField;
import jdk.vm.ci.meta.ResolvedJavaType;

The NewInstanceNode represents the allocation of an instance class object.
/** * The {@code NewInstanceNode} represents the allocation of an instance class object. */
@NodeInfo(nameTemplate = "New {p#instanceClass/s}") public class NewInstanceNode extends AbstractNewObjectNode implements VirtualizableAllocation { public static final NodeClass<NewInstanceNode> TYPE = NodeClass.create(NewInstanceNode.class); protected final ResolvedJavaType instanceClass; public NewInstanceNode(ResolvedJavaType type, boolean fillContents) { this(TYPE, type, fillContents, null); } public NewInstanceNode(ResolvedJavaType type, boolean fillContents, FrameState stateBefore) { this(TYPE, type, fillContents, stateBefore); } protected NewInstanceNode(NodeClass<? extends NewInstanceNode> c, ResolvedJavaType type, boolean fillContents, FrameState stateBefore) { super(c, StampFactory.objectNonNull(TypeReference.createExactTrusted(type)), fillContents, stateBefore); assert !type.isArray() && !type.isInterface() && !type.isPrimitive() && !type.isAbstract() : type; this.instanceClass = type; }
Gets the instance class being allocated by this node.
Returns:the instance class allocated
/** * Gets the instance class being allocated by this node. * * @return the instance class allocated */
public ResolvedJavaType instanceClass() { return instanceClass; } @Override public void virtualize(VirtualizerTool tool) { /* * Reference objects can escape into their ReferenceQueue at any safepoint, therefore * they're excluded from escape analysis. */ if (!tool.getMetaAccess().lookupJavaType(Reference.class).isAssignableFrom(instanceClass)) { VirtualInstanceNode virtualObject = createVirtualInstanceNode(true); ResolvedJavaField[] fields = virtualObject.getFields(); ValueNode[] state = new ValueNode[fields.length]; for (int i = 0; i < state.length; i++) { state[i] = defaultFieldValue(fields[i]); } tool.createVirtualObject(virtualObject, state, Collections.<MonitorIdNode> emptyList(), false); tool.replaceWithVirtual(virtualObject); } } protected VirtualInstanceNode createVirtualInstanceNode(boolean hasIdentity) { return new VirtualInstanceNode(instanceClass(), hasIdentity); } /* Factored out in a separate method so that subclasses can override it. */ protected ConstantNode defaultFieldValue(ResolvedJavaField field) { return ConstantNode.defaultForKind(field.getType().getJavaKind(), graph()); } }