1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "JniConstants"
18
19 #include "ALog-priv.h"
20 #include "JNIHelp-priv.h"
21 #include <nativehelper/JniConstants.h>
22 #include <nativehelper/JniConstants-priv.h>
23 #include <nativehelper/ScopedLocalRef.h>
24
25 #include <stdlib.h>
26
27 #include <atomic>
28 #include <mutex>
29
30 static std::atomic<bool> g_constants_initialized(false);
31 static std::mutex g_constants_mutex;
32
33 jclass JniConstants::booleanClass;
34 jclass JniConstants::byteArrayClass;
35 jclass JniConstants::calendarClass;
36 jclass JniConstants::charsetICUClass;
37 jclass JniConstants::doubleClass;
38 jclass JniConstants::errnoExceptionClass;
39 jclass JniConstants::fileDescriptorClass;
40 jclass JniConstants::gaiExceptionClass;
41 jclass JniConstants::inet6AddressClass;
42 jclass JniConstants::inet6AddressHolderClass;
43 jclass JniConstants::inetAddressClass;
44 jclass JniConstants::inetAddressHolderClass;
45 jclass JniConstants::inetSocketAddressClass;
46 jclass JniConstants::inetSocketAddressHolderClass;
47 jclass JniConstants::integerClass;
48 jclass JniConstants::localeDataClass;
49 jclass JniConstants::longClass;
50 jclass JniConstants::netlinkSocketAddressClass;
51 jclass JniConstants::packetSocketAddressClass;
52 jclass JniConstants::patternSyntaxExceptionClass;
53 jclass JniConstants::referenceClass;
54 jclass JniConstants::socketTaggerClass;
55 jclass JniConstants::stringClass;
56 jclass JniConstants::structAddrinfoClass;
57 jclass JniConstants::structFlockClass;
58 jclass JniConstants::structGroupReqClass;
59 jclass JniConstants::structIfaddrs;
60 jclass JniConstants::structLingerClass;
61 jclass JniConstants::structPasswdClass;
62 jclass JniConstants::structPollfdClass;
63 jclass JniConstants::structStatClass;
64 jclass JniConstants::structStatVfsClass;
65 jclass JniConstants::structTimevalClass;
66 jclass JniConstants::structTimespecClass;
67 jclass JniConstants::structUcredClass;
68 jclass JniConstants::structUtsnameClass;
69 jclass JniConstants::unixSocketAddressClass;
70 jclass JniConstants::zipEntryClass;
71
findClass(JNIEnv * env,const char * name)72 static jclass findClass(JNIEnv* env, const char* name) {
73 ScopedLocalRef<jclass> localClass(env, env->FindClass(name));
74 jclass result = reinterpret_cast<jclass>(env->NewGlobalRef(localClass.get()));
75 if (result == NULL) {
76 ALOGE("failed to find class '%s'", name);
77 abort();
78 }
79 return result;
80 }
81
init(JNIEnv * env)82 void JniConstants::init(JNIEnv* env) {
83 // Fast check
84 if (g_constants_initialized) {
85 // already initialized
86 return;
87 }
88
89 // Slightly slower check
90 std::lock_guard<std::mutex> guard(g_constants_mutex);
91 if (g_constants_initialized) {
92 // already initialized
93 return;
94 }
95
96 booleanClass = findClass(env, "java/lang/Boolean");
97 byteArrayClass = findClass(env, "[B");
98 calendarClass = findClass(env, "java/util/Calendar");
99 charsetICUClass = findClass(env, "java/nio/charset/CharsetICU");
100 doubleClass = findClass(env, "java/lang/Double");
101 errnoExceptionClass = findClass(env, "android/system/ErrnoException");
102 fileDescriptorClass = findClass(env, "java/io/FileDescriptor");
103 gaiExceptionClass = findClass(env, "android/system/GaiException");
104 inet6AddressClass = findClass(env, "java/net/Inet6Address");
105 inet6AddressHolderClass = findClass(env, "java/net/Inet6Address$Inet6AddressHolder");
106 inetAddressClass = findClass(env, "java/net/InetAddress");
107 inetAddressHolderClass = findClass(env, "java/net/InetAddress$InetAddressHolder");
108 inetSocketAddressClass = findClass(env, "java/net/InetSocketAddress");
109 inetSocketAddressHolderClass = findClass(env, "java/net/InetSocketAddress$InetSocketAddressHolder");
110 integerClass = findClass(env, "java/lang/Integer");
111 localeDataClass = findClass(env, "libcore/icu/LocaleData");
112 longClass = findClass(env, "java/lang/Long");
113 netlinkSocketAddressClass = findClass(env, "android/system/NetlinkSocketAddress");
114 packetSocketAddressClass = findClass(env, "android/system/PacketSocketAddress");
115 patternSyntaxExceptionClass = findClass(env, "java/util/regex/PatternSyntaxException");
116 referenceClass = findClass(env, "java/lang/ref/Reference");
117 socketTaggerClass = findClass(env, "dalvik/system/SocketTagger");
118 stringClass = findClass(env, "java/lang/String");
119 structAddrinfoClass = findClass(env, "android/system/StructAddrinfo");
120 structFlockClass = findClass(env, "android/system/StructFlock");
121 structGroupReqClass = findClass(env, "android/system/StructGroupReq");
122 structIfaddrs = findClass(env, "android/system/StructIfaddrs");
123 structLingerClass = findClass(env, "android/system/StructLinger");
124 structPasswdClass = findClass(env, "android/system/StructPasswd");
125 structPollfdClass = findClass(env, "android/system/StructPollfd");
126 structStatClass = findClass(env, "android/system/StructStat");
127 structStatVfsClass = findClass(env, "android/system/StructStatVfs");
128 structTimevalClass = findClass(env, "android/system/StructTimeval");
129 structTimespecClass = findClass(env, "android/system/StructTimespec");
130 structUcredClass = findClass(env, "android/system/StructUcred");
131 structUtsnameClass = findClass(env, "android/system/StructUtsname");
132 unixSocketAddressClass = findClass(env, "android/system/UnixSocketAddress");
133 zipEntryClass = findClass(env, "java/util/zip/ZipEntry");
134
135 g_constants_initialized = true;
136 }
137
138 namespace android {
139
ClearJniConstantsCache()140 void ClearJniConstantsCache() {
141 g_constants_initialized = false;
142 ClearJNIHelpLocalCache();
143 }
144
145 }
146