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