/*
* Copyright (c) 2013, 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.replacements.nodes;
import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8;
import java.util.Collections;
import org.graalvm.compiler.core.common.type.ObjectStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.core.common.type.StampPair;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.CallTargetNode.InvokeKind;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.java.LoadFieldNode;
import org.graalvm.compiler.nodes.java.MonitorIdNode;
import org.graalvm.compiler.nodes.spi.ArrayLengthProvider;
import org.graalvm.compiler.nodes.spi.VirtualizableAllocation;
import org.graalvm.compiler.nodes.spi.VirtualizerTool;
import org.graalvm.compiler.nodes.util.GraphUtil;
import org.graalvm.compiler.nodes.virtual.VirtualInstanceNode;
import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
import jdk.vm.ci.meta.Assumptions;
import jdk.vm.ci.meta.ResolvedJavaField;
import jdk.vm.ci.meta.ResolvedJavaMethod;
import jdk.vm.ci.meta.ResolvedJavaType;
@NodeInfo(cycles = CYCLES_8, size = SIZE_8)
public abstract class BasicObjectCloneNode extends MacroStateSplitNode implements VirtualizableAllocation, ArrayLengthProvider {
public static final NodeClass<BasicObjectCloneNode> TYPE = NodeClass.create(BasicObjectCloneNode.class);
public BasicObjectCloneNode(NodeClass<? extends MacroNode> c, InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, StampPair returnStamp, ValueNode... arguments) {
super(c, invokeKind, targetMethod, bci, returnStamp, arguments);
updateStamp(computeStamp(getObject()));
}
@Override
public boolean inferStamp() {
return updateStamp(computeStamp(getObject()));
}
private static Stamp computeStamp(ValueNode object) {
Stamp objectStamp = object.stamp();
if (objectStamp instanceof ObjectStamp) {
objectStamp = objectStamp.join(StampFactory.objectNonNull());
}
return objectStamp;
}
public ValueNode getObject() {
return arguments.get(0);
}
/*
* Looks at the given stamp and determines if it is an exact type (or can be assumed to be an
* exact type) and if it is a cloneable type.
*
* If yes, then the exact type is returned, otherwise it returns null.
*/
protected static ResolvedJavaType getConcreteType(Stamp stamp) {
if (!(stamp instanceof ObjectStamp)) {
return null;
}
ObjectStamp objectStamp = (ObjectStamp) stamp;
if (objectStamp.type() == null) {
return null;
} else if (objectStamp.isExactType()) {
return objectStamp.type().isCloneableWithAllocation() ? objectStamp.type() : null;
}
return null;
}
protected LoadFieldNode genLoadFieldNode(Assumptions assumptions, ValueNode originalAlias, ResolvedJavaField field) {
return LoadFieldNode.create(assumptions, originalAlias, field);
}
@Override
public void virtualize(VirtualizerTool tool) {
ValueNode originalAlias = tool.getAlias(getObject());
if (originalAlias instanceof VirtualObjectNode) {
VirtualObjectNode originalVirtual = (VirtualObjectNode) originalAlias;
if (originalVirtual.type().isCloneableWithAllocation()) {
ValueNode[] newEntryState = new ValueNode[originalVirtual.entryCount()];
for (int i = 0; i < newEntryState.length; i++) {
newEntryState[i] = tool.getEntry(originalVirtual, i);
}
VirtualObjectNode newVirtual = originalVirtual.duplicate();
tool.createVirtualObject(newVirtual, newEntryState, Collections.<MonitorIdNode> emptyList(), false);
tool.replaceWithVirtual(newVirtual);
}
} else {
ResolvedJavaType type = getConcreteType(originalAlias.stamp());
if (type != null && !type.isArray()) {
VirtualInstanceNode newVirtual = createVirtualInstanceNode(type, true);
ResolvedJavaField[] fields = newVirtual.getFields();
ValueNode[] state = new ValueNode[fields.length];
final LoadFieldNode[] loads = new LoadFieldNode[fields.length];
for (int i = 0; i < fields.length; i++) {
state[i] = loads[i] = genLoadFieldNode(graph().getAssumptions(), originalAlias, fields[i]);
tool.addNode(loads[i]);
}
tool.createVirtualObject(newVirtual, state, Collections.<MonitorIdNode> emptyList(), false);
tool.replaceWithVirtual(newVirtual);
}
}
}
protected VirtualInstanceNode createVirtualInstanceNode(ResolvedJavaType type, boolean hasIdentity) {
return new VirtualInstanceNode(type, hasIdentity);
}
@Override
public ValueNode length() {
return GraphUtil.arrayLength(getObject());
}
}