1 /*
2 * Copyright (c) 2011, 2016, 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
24
25 package org.graalvm.compiler.nodes.extended;
26
27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
29
30 import org.graalvm.compiler.core.common.type.PrimitiveStamp;
31 import org.graalvm.compiler.core.common.type.Stamp;
32 import org.graalvm.compiler.core.common.type.StampFactory;
33 import org.graalvm.compiler.graph.Node;
34 import org.graalvm.compiler.graph.NodeClass;
35 import org.graalvm.compiler.graph.spi.Canonicalizable;
36 import org.graalvm.compiler.graph.spi.CanonicalizerTool;
37 import org.graalvm.compiler.nodeinfo.NodeInfo;
38 import org.graalvm.compiler.nodes.ConstantNode;
39 import org.graalvm.compiler.nodes.NodeView;
40 import org.graalvm.compiler.nodes.ValueNode;
41 import org.graalvm.compiler.nodes.calc.ReinterpretNode;
42 import org.graalvm.compiler.nodes.java.LoadFieldNode;
43 import org.graalvm.compiler.nodes.spi.Lowerable;
44 import org.graalvm.compiler.nodes.spi.LoweringTool;
45 import org.graalvm.compiler.nodes.spi.Virtualizable;
46 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
47 import org.graalvm.compiler.nodes.type.StampTool;
48 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
49 import jdk.internal.vm.compiler.word.LocationIdentity;
50
51 import jdk.vm.ci.meta.Assumptions;
52 import jdk.vm.ci.meta.Constant;
53 import jdk.vm.ci.meta.JavaConstant;
54 import jdk.vm.ci.meta.JavaKind;
55 import jdk.vm.ci.meta.ResolvedJavaField;
56 import jdk.vm.ci.meta.ResolvedJavaType;
57
58 /**
59 * Load of a value from a location specified as an offset relative to an object. No null check is
60 * performed before the load.
61 */
62 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
63 public class RawLoadNode extends UnsafeAccessNode implements Lowerable, Virtualizable, Canonicalizable {
64 public static final NodeClass<RawLoadNode> TYPE = NodeClass.create(RawLoadNode.class);
65
66 /**
67 * This constructor exists for node intrinsics that need a stamp based on {@code accessKind}.
68 */
69 public RawLoadNode(ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity) {
70 this(object, offset, accessKind, locationIdentity, false);
71 }
72
73 public RawLoadNode(ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity, boolean forceAnyLocation) {
74 super(TYPE, StampFactory.forKind(accessKind.getStackKind()), object, offset, accessKind, locationIdentity, forceAnyLocation);
75 }
76
77 /**
78 * This constructor exists for node intrinsics that need a stamp based on the return type of the
79 * {@link org.graalvm.compiler.graph.Node.NodeIntrinsic} annotated method.
80 */
81 public RawLoadNode(@InjectedNodeParameter Stamp stamp, ValueNode object, ValueNode offset, LocationIdentity locationIdentity, JavaKind accessKind) {
82 super(TYPE, stamp, object, offset, accessKind, locationIdentity, false);
83 }
84
85 protected RawLoadNode(NodeClass<? extends RawLoadNode> c, ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity) {
86 super(c, StampFactory.forKind(accessKind.getStackKind()), object, offset, accessKind, locationIdentity, false);
87 }
88
89 @Override
90 public void lower(LoweringTool tool) {
91 tool.getLowerer().lower(this, tool);
92 }
93
94 @Override
95 public void virtualize(VirtualizerTool tool) {
96 ValueNode alias = tool.getAlias(object());
97 if (alias instanceof VirtualObjectNode) {
98 VirtualObjectNode virtual = (VirtualObjectNode) alias;
99 ValueNode offsetValue = tool.getAlias(offset());
100 if (offsetValue.isConstant()) {
101 long off = offsetValue.asJavaConstant().asLong();
102 int entryIndex = virtual.entryIndexForOffset(tool.getArrayOffsetProvider(), off, accessKind());
103
104 if (entryIndex != -1) {
105 ValueNode entry = tool.getEntry(virtual, entryIndex);
106 JavaKind entryKind = virtual.entryKind(entryIndex);
107 if (entry.getStackKind() == getStackKind() || entryKind == accessKind()) {
108
109 if (!(entry.stamp(NodeView.DEFAULT).isCompatible(stamp(NodeView.DEFAULT)))) {
110 if (entry.stamp(NodeView.DEFAULT) instanceof PrimitiveStamp && stamp instanceof PrimitiveStamp) {
111 PrimitiveStamp p1 = (PrimitiveStamp) stamp;
112 PrimitiveStamp p2 = (PrimitiveStamp) entry.stamp(NodeView.DEFAULT);
113 int width1 = p1.getBits();
114 int width2 = p2.getBits();
115 if (width1 == width2) {
116 Node replacement = ReinterpretNode.create(p2, entry, NodeView.DEFAULT);
117 tool.replaceWith((ValueNode) replacement);
118 return;
119 } else {
120 // different bit width
121 return;
122 }
123 } else {
124 // cannot reinterpret for arbitrary objects
125 return;
126 }
127 }
128 tool.replaceWith(entry);
129 }
130 }
131 }
132 }
133 }
134
135 @Override
136 public Node canonical(CanonicalizerTool tool) {
137 if (!isAnyLocationForced() && getLocationIdentity().isAny()) {
138 ValueNode targetObject = object();
139 if (offset().isConstant() && targetObject.isConstant() && !targetObject.isNullConstant()) {
140 ConstantNode objectConstant = (ConstantNode) targetObject;
141 ResolvedJavaType type = StampTool.typeOrNull(objectConstant);
142 if (type != null && type.isArray()) {
143 JavaConstant arrayConstant = objectConstant.asJavaConstant();
144 if (arrayConstant != null) {
145 int stableDimension = objectConstant.getStableDimension();
146 if (stableDimension > 0) {
147 NodeView view = NodeView.from(tool);
148 long constantOffset = offset().asJavaConstant().asLong();
149 Constant constant = stamp(view).readConstant(tool.getConstantReflection().getMemoryAccessProvider(), arrayConstant, constantOffset);
150 boolean isDefaultStable = objectConstant.isDefaultStable();
151 if (constant != null && (isDefaultStable || !constant.isDefaultForKind())) {
152 return ConstantNode.forConstant(stamp(view), constant, stableDimension - 1, isDefaultStable, tool.getMetaAccess());
153 }
154 }
155 }
156 }
157 }
158 }
159 return super.canonical(tool);
160 }
161
162 @Override
163 protected ValueNode cloneAsFieldAccess(Assumptions assumptions, ResolvedJavaField field, boolean volatileAccess) {
164 return LoadFieldNode.create(assumptions, object(), field, volatileAccess);
165 }
166
167 @Override
168 protected ValueNode cloneAsArrayAccess(ValueNode location, LocationIdentity identity) {
169 return new RawLoadNode(object(), location, accessKind(), identity);
170 }
171
172 @NodeIntrinsic
173 public static native Object load(Object object, long offset, @ConstantNodeParameter JavaKind kind, @ConstantNodeParameter LocationIdentity locationIdentity);
174 }