1 /*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.graalvm.compiler.replacements.nodes;
24
25 import java.util.Collections;
26
27 import org.graalvm.compiler.core.common.type.ObjectStamp;
28 import org.graalvm.compiler.core.common.type.Stamp;
29 import org.graalvm.compiler.core.common.type.StampFactory;
30 import org.graalvm.compiler.core.common.type.StampPair;
31 import org.graalvm.compiler.graph.NodeClass;
32 import org.graalvm.compiler.nodeinfo.NodeInfo;
33 import org.graalvm.compiler.nodes.CallTargetNode.InvokeKind;
34 import org.graalvm.compiler.nodes.ValueNode;
35 import org.graalvm.compiler.nodes.java.LoadFieldNode;
36 import org.graalvm.compiler.nodes.java.MonitorIdNode;
37 import org.graalvm.compiler.nodes.spi.ArrayLengthProvider;
38 import org.graalvm.compiler.nodes.spi.VirtualizableAllocation;
39 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
40 import org.graalvm.compiler.nodes.util.GraphUtil;
41 import org.graalvm.compiler.nodes.virtual.VirtualInstanceNode;
42 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
43
44 import jdk.vm.ci.meta.Assumptions;
45 import jdk.vm.ci.meta.ResolvedJavaField;
46 import jdk.vm.ci.meta.ResolvedJavaMethod;
47 import jdk.vm.ci.meta.ResolvedJavaType;
48
49 @NodeInfo
50 public abstract class BasicObjectCloneNode extends MacroStateSplitNode implements VirtualizableAllocation, ArrayLengthProvider {
51
52 public static final NodeClass<BasicObjectCloneNode> TYPE = NodeClass.create(BasicObjectCloneNode.class);
53
54 public BasicObjectCloneNode(NodeClass<? extends MacroNode> c, InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, StampPair returnStamp, ValueNode... arguments) {
55 super(c, invokeKind, targetMethod, bci, returnStamp, arguments);
56 updateStamp(computeStamp(getObject()));
57 }
58
59 @Override
60 public boolean inferStamp() {
61 return updateStamp(computeStamp(getObject()));
62 }
63
64 private static Stamp computeStamp(ValueNode object) {
65 Stamp objectStamp = object.stamp();
66 if (objectStamp instanceof ObjectStamp) {
67 objectStamp = objectStamp.join(StampFactory.objectNonNull());
68 }
69 return objectStamp;
70 }
71
72 public ValueNode getObject() {
73 return arguments.get(0);
74 }
75
76 /*
77 * Looks at the given stamp and determines if it is an exact type (or can be assumed to be an
78 * exact type) and if it is a cloneable type.
79 *
80 * If yes, then the exact type is returned, otherwise it returns null.
81 */
82 protected static ResolvedJavaType getConcreteType(Stamp stamp) {
83 if (!(stamp instanceof ObjectStamp)) {
84 return null;
85 }
86 ObjectStamp objectStamp = (ObjectStamp) stamp;
87 if (objectStamp.type() == null) {
88 return null;
89 } else if (objectStamp.isExactType()) {
90 return objectStamp.type().isCloneableWithAllocation() ? objectStamp.type() : null;
91 }
92 return null;
93 }
94
95 protected LoadFieldNode genLoadFieldNode(Assumptions assumptions, ValueNode originalAlias, ResolvedJavaField field) {
96 return LoadFieldNode.create(assumptions, originalAlias, field);
97 }
98
99 @Override
100 public void virtualize(VirtualizerTool tool) {
101 ValueNode originalAlias = tool.getAlias(getObject());
102 if (originalAlias instanceof VirtualObjectNode) {
103 VirtualObjectNode originalVirtual = (VirtualObjectNode) originalAlias;
104 if (originalVirtual.type().isCloneableWithAllocation()) {
105 ValueNode[] newEntryState = new ValueNode[originalVirtual.entryCount()];
106 for (int i = 0; i < newEntryState.length; i++) {
107 newEntryState[i] = tool.getEntry(originalVirtual, i);
108 }
109 VirtualObjectNode newVirtual = originalVirtual.duplicate();
110 tool.createVirtualObject(newVirtual, newEntryState, Collections.<MonitorIdNode> emptyList(), false);
111 tool.replaceWithVirtual(newVirtual);
112 }
113 } else {
114 ResolvedJavaType type = getConcreteType(originalAlias.stamp());
115 if (type != null && !type.isArray()) {
116 VirtualInstanceNode newVirtual = createVirtualInstanceNode(type, true);
117 ResolvedJavaField[] fields = newVirtual.getFields();
118
119 ValueNode[] state = new ValueNode[fields.length];
120 final LoadFieldNode[] loads = new LoadFieldNode[fields.length];
121 for (int i = 0; i < fields.length; i++) {
122 state[i] = loads[i] = genLoadFieldNode(graph().getAssumptions(), originalAlias, fields[i]);
123 tool.addNode(loads[i]);
124 }
125 tool.createVirtualObject(newVirtual, state, Collections.<MonitorIdNode> emptyList(), false);
126 tool.replaceWithVirtual(newVirtual);
127 }
128 }
129 }
130
131 protected VirtualInstanceNode createVirtualInstanceNode(ResolvedJavaType type, boolean hasIdentity) {
132 return new VirtualInstanceNode(type, hasIdentity);
133 }
134
135 @Override
136 public ValueNode length() {
137 return GraphUtil.arrayLength(getObject());
138 }
139 }