1 /*
2 * Copyright (C) 2018 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 #include "jni.h"
18 #include "core_jni_helpers.h"
19
20 #include <unicode/putil.h>
21 #include <clocale>
22 #include <sstream>
23 #include <unordered_map>
24 #include <vector>
25
26 using namespace std;
27
28 /*
29 * This is responsible for setting up the JNI environment for communication between
30 * the Java and native parts of layoutlib, including registering native methods.
31 * This is mostly achieved by copying the way it is done in the platform
32 * (see AndroidRuntime.cpp).
33 */
34
35 static JavaVM* javaVM;
36
37 namespace android {
38
39 extern int register_android_animation_PropertyValuesHolder(JNIEnv *env);
40 extern int register_android_content_AssetManager(JNIEnv* env);
41 extern int register_android_content_StringBlock(JNIEnv* env);
42 extern int register_android_content_XmlBlock(JNIEnv* env);
43 extern int register_android_content_res_ApkAssets(JNIEnv* env);
44 extern int register_android_database_CursorWindow(JNIEnv* env);
45 extern int register_android_database_SQLiteConnection(JNIEnv* env);
46 extern int register_android_database_SQLiteGlobal(JNIEnv* env);
47 extern int register_android_database_SQLiteDebug(JNIEnv* env);
48 extern int register_android_os_FileObserver(JNIEnv* env);
49 extern int register_android_os_MessageQueue(JNIEnv* env);
50 extern int register_android_os_SystemClock(JNIEnv* env);
51 extern int register_android_os_SystemProperties(JNIEnv* env);
52 extern int register_android_os_Trace(JNIEnv* env);
53 extern int register_android_text_AndroidCharacter(JNIEnv* env);
54 extern int register_android_util_EventLog(JNIEnv* env);
55 extern int register_android_util_Log(JNIEnv* env);
56 extern int register_android_util_jar_StrictJarFile(JNIEnv* env);
57 extern int register_com_android_internal_util_VirtualRefBasePtr(JNIEnv *env);
58
59 #define REG_JNI(name) { name }
60 struct RegJNIRec {
61 int (*mProc)(JNIEnv*);
62 };
63
64 // Map of all possible class names to register to their corresponding JNI registration function pointer
65 // The actual list of registered classes will be determined at runtime via the 'native_classes' System property
66 static const std::unordered_map<std::string, RegJNIRec> gRegJNIMap = {
67 {"android.animation.PropertyValuesHolder",
68 REG_JNI(register_android_animation_PropertyValuesHolder)},
69 #ifdef __linux__
70 {"android.content.res.ApkAssets", REG_JNI(register_android_content_res_ApkAssets)},
71 {"android.content.res.AssetManager", REG_JNI(register_android_content_AssetManager)},
72 {"android.database.CursorWindow", REG_JNI(register_android_database_CursorWindow)},
73 {"android.database.sqlite.SQLiteConnection",
74 REG_JNI(register_android_database_SQLiteConnection)},
75 {"android.database.sqlite.SQLiteGlobal", REG_JNI(register_android_database_SQLiteGlobal)},
76 {"android.database.sqlite.SQLiteDebug", REG_JNI(register_android_database_SQLiteDebug)},
77 #endif
78 {"android.content.res.StringBlock", REG_JNI(register_android_content_StringBlock)},
79 {"android.content.res.XmlBlock", REG_JNI(register_android_content_XmlBlock)},
80 #ifdef __linux__
81 {"android.os.FileObserver", REG_JNI(register_android_os_FileObserver)},
82 {"android.os.MessageQueue", REG_JNI(register_android_os_MessageQueue)},
83 #endif
84 {"android.os.SystemClock", REG_JNI(register_android_os_SystemClock)},
85 {"android.os.SystemProperties", REG_JNI(register_android_os_SystemProperties)},
86 {"android.os.Trace", REG_JNI(register_android_os_Trace)},
87 {"android.text.AndroidCharacter", REG_JNI(register_android_text_AndroidCharacter)},
88 {"android.util.EventLog", REG_JNI(register_android_util_EventLog)},
89 {"android.util.Log", REG_JNI(register_android_util_Log)},
90 {"android.util.jar.StrictJarFile", REG_JNI(register_android_util_jar_StrictJarFile)},
91 {"com.android.internal.util.VirtualRefBasePtr",
92 REG_JNI(register_com_android_internal_util_VirtualRefBasePtr)},
93 };
94 // Vector to store the names of classes that need delegates of their native methods
95 static vector<string> classesToDelegate;
96
register_jni_procs(const std::unordered_map<std::string,RegJNIRec> & jniRegMap,const vector<string> & classesToRegister,JNIEnv * env)97 static int register_jni_procs(const std::unordered_map<std::string, RegJNIRec>& jniRegMap,
98 const vector<string>& classesToRegister, JNIEnv* env) {
99
100 for (const string& className : classesToRegister) {
101 if (jniRegMap.at(className).mProc(env) < 0) {
102 return -1;
103 }
104 }
105 return 0;
106 }
107
registerNativeMethods(JNIEnv * env,const char * className,const JNINativeMethod * gMethods,int numMethods)108 int AndroidRuntime::registerNativeMethods(JNIEnv* env,
109 const char* className, const JNINativeMethod* gMethods, int numMethods) {
110 string classNameString = string(className);
111 if (find(classesToDelegate.begin(), classesToDelegate.end(), classNameString)
112 != classesToDelegate.end()) {
113 // Register native methods to the delegate class <classNameString>_NativeDelegate
114 // by adding _Original to the name of each method.
115 replace(classNameString.begin(), classNameString.end(), '$', '_');
116 string delegateClassName = classNameString + "_NativeDelegate";
117 jclass clazz = env->FindClass(delegateClassName.c_str());
118 JNINativeMethod gTypefaceDelegateMethods[numMethods];
119 for (int i = 0; i < numMethods; i++) {
120 JNINativeMethod gTypefaceMethod = gMethods[i];
121 string newName = string(gTypefaceMethod.name) + "_Original";
122 gTypefaceDelegateMethods[i].name = strdup(newName.c_str());
123 gTypefaceDelegateMethods[i].signature = gTypefaceMethod.signature;
124 gTypefaceDelegateMethods[i].fnPtr = gTypefaceMethod.fnPtr;
125 }
126 int result = env->RegisterNatives(clazz, gTypefaceDelegateMethods, numMethods);
127 for (int i = 0; i < numMethods; i++) {
128 free((char*)gTypefaceDelegateMethods[i].name);
129 }
130 return result;
131 }
132
133 jclass clazz = env->FindClass(className);
134 return env->RegisterNatives(clazz, gMethods, numMethods);
135 }
136
getJNIEnv()137 JNIEnv* AndroidRuntime::getJNIEnv() {
138 JNIEnv* env;
139 if (javaVM->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK)
140 return nullptr;
141 return env;
142 }
143
getJavaVM()144 JavaVM* AndroidRuntime::getJavaVM() {
145 return javaVM;
146 }
147
parseCsv(const string & csvString)148 static vector<string> parseCsv(const string& csvString) {
149 vector<string> result;
150 istringstream stream(csvString);
151 string segment;
152 while(getline(stream, segment, ','))
153 {
154 result.push_back(segment);
155 }
156 return result;
157 }
158
parseCsv(JNIEnv * env,jstring csvJString)159 static vector<string> parseCsv(JNIEnv* env, jstring csvJString) {
160 const char* charArray = env->GetStringUTFChars(csvJString, 0);
161 string csvString(charArray);
162 vector<string> result = parseCsv(csvString);
163 env->ReleaseStringUTFChars(csvJString, charArray);
164 return result;
165 }
166
167 } // namespace android
168
169 using namespace android;
170
JNI_OnLoad(JavaVM * vm,void *)171 JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
172 javaVM = vm;
173 JNIEnv* env = nullptr;
174 if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
175 return JNI_ERR;
176 }
177
178 // Configuration is stored as java System properties.
179 // Get a reference to System.getProperty
180 jclass system = FindClassOrDie(env, "java/lang/System");
181 jmethodID getPropertyMethod = GetStaticMethodIDOrDie(env, system, "getProperty",
182 "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;");
183
184 // Get the names of classes that have to delegate their native methods
185 auto delegateNativesToNativesString =
186 (jstring) env->CallStaticObjectMethod(system,
187 getPropertyMethod, env->NewStringUTF("delegate_natives_to_natives"),
188 env->NewStringUTF(""));
189 classesToDelegate = parseCsv(env, delegateNativesToNativesString);
190
191 // Get the names of classes that need to register their native methods
192 auto nativesClassesJString =
193 (jstring) env->CallStaticObjectMethod(system,
194 getPropertyMethod, env->NewStringUTF("native_classes"),
195 env->NewStringUTF(""));
196 vector<string> classesToRegister = parseCsv(env, nativesClassesJString);
197
198 if (register_jni_procs(gRegJNIMap, classesToRegister, env) < 0) {
199 return JNI_ERR;
200 }
201
202 // Set the location of ICU data
203 auto stringPath = (jstring) env->CallStaticObjectMethod(system,
204 getPropertyMethod, env->NewStringUTF("icu.dir"),
205 env->NewStringUTF(""));
206 const char* path = env->GetStringUTFChars(stringPath, 0);
207 u_setDataDirectory(path);
208 env->ReleaseStringUTFChars(stringPath, path);
209
210 // Use English locale for number format to ensure correct parsing of floats when using strtof
211 setlocale(LC_NUMERIC, "en_US.UTF-8");
212
213 return JNI_VERSION_1_6;
214 }
215
216