1/*
2 * Copyright (c) 2012, 2014, 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 */
23package org.graalvm.compiler.hotspot.replacements;
24
25import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG;
26import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.ARRAY_KLASS_COMPONENT_MIRROR;
27import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.KLASS_ACCESS_FLAGS_LOCATION;
28import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.KLASS_MODIFIER_FLAGS_LOCATION;
29import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.KLASS_SUPER_KLASS_LOCATION;
30import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayKlassComponentMirrorOffset;
31import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.klassAccessFlagsOffset;
32import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.klassIsArray;
33import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.klassModifierFlagsOffset;
34import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.klassSuperKlassOffset;
35
36import java.lang.reflect.Modifier;
37
38import org.graalvm.compiler.api.replacements.ClassSubstitution;
39import org.graalvm.compiler.api.replacements.MethodSubstitution;
40import org.graalvm.compiler.hotspot.word.KlassPointer;
41import org.graalvm.compiler.nodes.PiNode;
42
43// JaCoCo Exclude
44
45/**
46 * Substitutions for {@link java.lang.Class} methods.
47 */
48@ClassSubstitution(Class.class)
49public class HotSpotClassSubstitutions {
50
51    @MethodSubstitution(isStatic = false)
52    public static int getModifiers(final Class<?> thisObj) {
53        KlassPointer klass = ClassGetHubNode.readClass(thisObj);
54        if (klass.isNull()) {
55            // Class for primitive type
56            return Modifier.ABSTRACT | Modifier.FINAL | Modifier.PUBLIC;
57        } else {
58            return klass.readInt(klassModifierFlagsOffset(INJECTED_VMCONFIG), KLASS_MODIFIER_FLAGS_LOCATION);
59        }
60    }
61
62    @MethodSubstitution(isStatic = false)
63    public static boolean isInterface(final Class<?> thisObj) {
64        KlassPointer klass = ClassGetHubNode.readClass(thisObj);
65        if (klass.isNull()) {
66            // Class for primitive type
67            return false;
68        } else {
69            int accessFlags = klass.readInt(klassAccessFlagsOffset(INJECTED_VMCONFIG), KLASS_ACCESS_FLAGS_LOCATION);
70            return (accessFlags & Modifier.INTERFACE) != 0;
71        }
72    }
73
74    @MethodSubstitution(isStatic = false)
75    public static boolean isArray(final Class<?> thisObj) {
76        KlassPointer klass = ClassGetHubNode.readClass(thisObj);
77        if (klass.isNull()) {
78            // Class for primitive type
79            return false;
80        } else {
81            return klassIsArray(klass);
82        }
83    }
84
85    @MethodSubstitution(isStatic = false)
86    public static boolean isPrimitive(final Class<?> thisObj) {
87        KlassPointer klass = ClassGetHubNode.readClass(thisObj);
88        return klass.isNull();
89    }
90
91    @MethodSubstitution(isStatic = false)
92    public static Class<?> getSuperclass(final Class<?> thisObj) {
93        KlassPointer klass = ClassGetHubNode.readClass(thisObj);
94        if (!klass.isNull()) {
95            int accessFlags = klass.readInt(klassAccessFlagsOffset(INJECTED_VMCONFIG), KLASS_ACCESS_FLAGS_LOCATION);
96            if ((accessFlags & Modifier.INTERFACE) == 0) {
97                if (klassIsArray(klass)) {
98                    return Object.class;
99                } else {
100                    KlassPointer superKlass = klass.readKlassPointer(klassSuperKlassOffset(INJECTED_VMCONFIG), KLASS_SUPER_KLASS_LOCATION);
101                    if (superKlass.isNull()) {
102                        return null;
103                    } else {
104                        return readJavaMirror(superKlass);
105                    }
106                }
107            }
108        } else {
109            // Class for primitive type
110        }
111        return null;
112    }
113
114    public static Class<?> readJavaMirror(KlassPointer klass) {
115        return PiNode.asNonNullClass(HubGetClassNode.readClass(klass));
116    }
117
118    @MethodSubstitution(isStatic = false)
119    public static Class<?> getComponentType(final Class<?> thisObj) {
120        KlassPointer klass = ClassGetHubNode.readClass(thisObj);
121        if (!klass.isNull()) {
122            if (klassIsArray(klass)) {
123                return PiNode.asNonNullClass(klass.readObject(arrayKlassComponentMirrorOffset(INJECTED_VMCONFIG), ARRAY_KLASS_COMPONENT_MIRROR));
124            }
125        } else {
126            // Class for primitive type
127        }
128        return null;
129    }
130}
131