1 /*
2 * Copyright (C) 2020 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 "dalvik_system_DexFile.h"
18
19 #include <memory>
20
21 #include "class_loader_context.h"
22 #include "native_util.h"
23 #include "nativehelper/jni_macros.h"
24 #include "well_known_classes.h"
25
26 namespace art {
27
append_string(JNIEnv * env,jobjectArray array,uint32_t & i,const std::string & string)28 static bool append_string(JNIEnv* env, jobjectArray array, uint32_t& i, const std::string& string) {
29 ScopedLocalRef<jstring> jstring(env, env->NewStringUTF(string.c_str()));
30 if (jstring.get() == nullptr) {
31 DCHECK(env->ExceptionCheck());
32 return false;
33 }
34 env->SetObjectArrayElement(array, i++, jstring.get());
35 return true;
36 }
37
BaseDexClassLoader_computeClassLoaderContextsNative(JNIEnv * env,jobject class_loader)38 static jobjectArray BaseDexClassLoader_computeClassLoaderContextsNative(JNIEnv* env,
39 jobject class_loader) {
40 CHECK(class_loader != nullptr);
41 std::map<std::string, std::string> contextMap =
42 ClassLoaderContext::EncodeClassPathContextsForClassLoader(class_loader);
43 jobjectArray result = env->NewObjectArray(2 * contextMap.size(),
44 WellKnownClasses::java_lang_String,
45 nullptr);
46 if (result == nullptr) {
47 DCHECK(env->ExceptionCheck());
48 return nullptr;
49 }
50 uint32_t i = 0;
51 for (const auto& classpath_to_context : contextMap) {
52 const std::string& classpath = classpath_to_context.first;
53 const std::string& context = classpath_to_context.second;
54 if (!append_string(env, result, i, classpath) || !append_string(env, result, i, context)) {
55 return nullptr;
56 }
57 }
58 return result;
59 }
60
61 static JNINativeMethod gMethods[] = {
62 NATIVE_METHOD(BaseDexClassLoader, computeClassLoaderContextsNative,
63 "()[Ljava/lang/String;"),
64 };
65
register_dalvik_system_BaseDexClassLoader(JNIEnv * env)66 void register_dalvik_system_BaseDexClassLoader(JNIEnv* env) {
67 REGISTER_NATIVE_METHODS("dalvik/system/BaseDexClassLoader");
68 }
69
70 } // namespace art
71