1 /*
2 * Copyright (c) 2015, 2018, 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.hotspot.meta;
26
27 import java.lang.reflect.Method;
28 import java.util.function.Supplier;
29
30 import org.graalvm.compiler.core.common.type.ObjectStamp;
31 import org.graalvm.compiler.core.common.type.Stamp;
32 import org.graalvm.compiler.core.common.type.StampFactory;
33 import org.graalvm.compiler.debug.GraalError;
34 import org.graalvm.compiler.hotspot.nodes.aot.InitializeKlassNode;
35 import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantNode;
36 import org.graalvm.compiler.nodes.ConstantNode;
37 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode;
38 import org.graalvm.compiler.nodes.FrameState;
39 import org.graalvm.compiler.nodes.ValueNode;
40 import org.graalvm.compiler.nodes.graphbuilderconf.ClassInitializationPlugin;
41 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;
42
43 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;
44 import jdk.vm.ci.meta.ConstantPool;
45 import jdk.vm.ci.meta.ResolvedJavaMethod;
46 import jdk.vm.ci.meta.ResolvedJavaType;
47
48 public final class HotSpotClassInitializationPlugin implements ClassInitializationPlugin {
49 private static boolean shouldApply(GraphBuilderContext builder, ResolvedJavaType type) {
50 if (!builder.parsingIntrinsic()) {
51 if (!type.isArray()) {
52 ResolvedJavaMethod method = builder.getGraph().method();
53 ResolvedJavaType methodHolder = method.getDeclaringClass();
54 // We can elide initialization nodes if type >=: methodHolder.
55 // The type is already initialized by either "new" or "invokestatic".
56
57 // Emit initialization node if type is an interface since:
58 // JLS 12.4: Before a class is initialized, its direct superclass must be
59 // initialized, but interfaces implemented by the class are not
60 // initialized and a class or interface type T will be initialized
61 // immediately before the first occurrence of accesses listed
62 // in JLS 12.4.1.
63
64 return !type.isAssignableFrom(methodHolder) || type.isInterface();
65 } else if (!type.getComponentType().isPrimitive()) {
66 // Always apply to object array types
67 return true;
68 }
69 }
70 return false;
71 }
72
73 @Override
74 public boolean apply(GraphBuilderContext builder, ResolvedJavaType type, Supplier<FrameState> frameState, ValueNode[] classInit) {
75 if (shouldApply(builder, type)) {
76 Stamp hubStamp = builder.getStampProvider().createHubStamp((ObjectStamp) StampFactory.objectNonNull());
77 ConstantNode hub = builder.append(ConstantNode.forConstant(hubStamp, ((HotSpotResolvedObjectType) type).klass(), builder.getMetaAccess(), builder.getGraph()));
78 DeoptimizingFixedWithNextNode result = builder.append(type.isArray() ? new ResolveConstantNode(hub) : new InitializeKlassNode(hub));
79 result.setStateBefore(frameState.get());
80 if (classInit != null) {
81 classInit[0] = result;
82 }
83 return true;
84 }
85 return false;
86 }
87
88 private static final Class<? extends ConstantPool> hscp;
89 private static final Method loadReferencedTypeIIZMH;
90
91 static {
92 Method m = null;
93 Class<? extends ConstantPool> c = null;
94 try {
95 c = Class.forName("jdk.vm.ci.hotspot.HotSpotConstantPool").asSubclass(ConstantPool.class);
96 m = c.getDeclaredMethod("loadReferencedType", int.class, int.class, boolean.class);
97 } catch (Exception e) {
98 throw GraalError.shouldNotReachHere(e);
99 }
100 loadReferencedTypeIIZMH = m;
101 hscp = c;
102 }
103
104 private static boolean isHotSpotConstantPool(ConstantPool cp) {
105 // jdk.vm.ci.hotspot.HotSpotConstantPool is final, so we can
106 // directly compare Classes.
107 return cp.getClass() == hscp;
108 }
109
110 @Override
111 public boolean supportsLazyInitialization(ConstantPool cp) {
112 if (loadReferencedTypeIIZMH != null && isHotSpotConstantPool(cp)) {
113 return true;
114 }
115 return false;
116 }
117
118 @Override
119 public void loadReferencedType(GraphBuilderContext builder, ConstantPool cp, int cpi, int opcode) {
120 if (loadReferencedTypeIIZMH != null && isHotSpotConstantPool(cp)) {
121 try {
122 loadReferencedTypeIIZMH.invoke(cp, cpi, opcode, false);
123 } catch (Throwable t) {
124 throw GraalError.shouldNotReachHere(t);
125 }
126 } else {
127 cp.loadReferencedType(cpi, opcode);
128 }
129 }
130
131 }