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.nodeinfo.NodeInfo;
34 import org.graalvm.compiler.nodes.ValueNode;
35 import org.graalvm.compiler.nodes.calc.ReinterpretNode;
36 import org.graalvm.compiler.nodes.java.LoadFieldNode;
37 import org.graalvm.compiler.nodes.spi.Lowerable;
38 import org.graalvm.compiler.nodes.spi.LoweringTool;
39 import org.graalvm.compiler.nodes.spi.Virtualizable;
40 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
41 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
42 import org.graalvm.word.LocationIdentity;
43
44 import jdk.vm.ci.meta.Assumptions;
45 import jdk.vm.ci.meta.JavaKind;
46 import jdk.vm.ci.meta.ResolvedJavaField;
47
48 /**
49 * Load of a value from a location specified as an offset relative to an object. No null check is
50 * performed before the load.
51 */
52 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
53 public class RawLoadNode extends UnsafeAccessNode implements Lowerable, Virtualizable {
54 public static final NodeClass<RawLoadNode> TYPE = NodeClass.create(RawLoadNode.class);
55
56 /**
57 * This constructor exists for node intrinsics that need a stamp based on {@code accessKind}.
58 */
59 public RawLoadNode(ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity) {
60 this(object, offset, accessKind, locationIdentity, false);
61 }
62
63 public RawLoadNode(ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity, boolean forceAnyLocation) {
64 super(TYPE, StampFactory.forKind(accessKind.getStackKind()), object, offset, accessKind, locationIdentity, forceAnyLocation);
65 }
66
67 /**
68 * This constructor exists for node intrinsics that need a stamp based on the return type of the
69 * {@link org.graalvm.compiler.graph.Node.NodeIntrinsic} annotated method.
70 */
71 public RawLoadNode(@InjectedNodeParameter Stamp stamp, ValueNode object, ValueNode offset, LocationIdentity locationIdentity, JavaKind accessKind) {
72 super(TYPE, stamp, object, offset, accessKind, locationIdentity, false);
73 }
74
75 public RawLoadNode(NodeClass<? extends RawLoadNode> c, ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity) {
76 super(c, StampFactory.forKind(accessKind.getStackKind()), object, offset, accessKind, locationIdentity, false);
77 }
78
79 @Override
80 public void lower(LoweringTool tool) {
81 tool.getLowerer().lower(this, tool);
82 }
83
84 @Override
85 public void virtualize(VirtualizerTool tool) {
86 ValueNode alias = tool.getAlias(object());
87 if (alias instanceof VirtualObjectNode) {
88 VirtualObjectNode virtual = (VirtualObjectNode) alias;
89 ValueNode offsetValue = tool.getAlias(offset());
90 if (offsetValue.isConstant()) {
91 long off = offsetValue.asJavaConstant().asLong();
92 int entryIndex = virtual.entryIndexForOffset(off, accessKind());
93
94 if (entryIndex != -1) {
95 ValueNode entry = tool.getEntry(virtual, entryIndex);
96 JavaKind entryKind = virtual.entryKind(entryIndex);
97 if (entry.getStackKind() == getStackKind() || entryKind == accessKind()) {
98
99 if (!(entry.stamp().isCompatible(stamp()))) {
100 if (entry.stamp() instanceof PrimitiveStamp && stamp instanceof PrimitiveStamp) {
101 PrimitiveStamp p1 = (PrimitiveStamp) stamp;
102 PrimitiveStamp p2 = (PrimitiveStamp) entry.stamp();
103 int width1 = p1.getBits();
104 int width2 = p2.getBits();
105 if (width1 == width2) {
106 Node replacement = new ReinterpretNode(p2, entry);
107 tool.replaceWith((ValueNode) replacement);
108 return;
109 } else {
110 // different bit width
111 return;
112 }
113 } else {
114 // cannot reinterpret for arbitrary objects
115 return;
116 }
117 }
118 tool.replaceWith(entry);
119 }
120 }
121 }
122 }
123 }
124
125 @Override
126 protected ValueNode cloneAsFieldAccess(Assumptions assumptions, ResolvedJavaField field) {
127 return LoadFieldNode.create(assumptions, object(), field);
128 }
129
130 @Override
131 protected ValueNode cloneAsArrayAccess(ValueNode location, LocationIdentity identity) {
132 return new RawLoadNode(object(), location, accessKind(), identity);
133 }
134
135 @NodeIntrinsic
136 public static native Object load(Object object, long offset, @ConstantNodeParameter JavaKind kind, @ConstantNodeParameter LocationIdentity locationIdentity);
137 }