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 "class_root-inl.h"
23 #include "mirror/object_array-alloc-inl.h"
24 #include "native_util.h"
25 #include "nativehelper/jni_macros.h"
26 #include "thread-inl.h"
27
28 namespace art {
29
append_string(Thread * self,Handle<mirror::ObjectArray<mirror::String>> array,uint32_t & i,const std::string & string)30 static bool append_string(Thread* self,
31 Handle<mirror::ObjectArray<mirror::String>> array,
32 uint32_t& i,
33 const std::string& string) REQUIRES_SHARED(Locks::mutator_lock_) {
34 ObjPtr<mirror::String> ostring = mirror::String::AllocFromModifiedUtf8(self, string.c_str());
35 if (ostring == nullptr) {
36 DCHECK(self->IsExceptionPending());
37 return false;
38 }
39 // We're initializing a newly allocated array object, so we do not need to record that under
40 // a transaction. If the transaction is aborted, the whole object shall be unreachable.
41 array->SetWithoutChecks</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(i, ostring);
42 ++i;
43 return true;
44 }
45
BaseDexClassLoader_computeClassLoaderContextsNative(JNIEnv * env,jobject class_loader)46 static jobjectArray BaseDexClassLoader_computeClassLoaderContextsNative(JNIEnv* env,
47 jobject class_loader) {
48 CHECK(class_loader != nullptr);
49 std::map<std::string, std::string> context_map =
50 ClassLoaderContext::EncodeClassPathContextsForClassLoader(class_loader);
51 Thread* self = Thread::ForEnv(env);
52 ScopedObjectAccess soa(self);
53 StackHandleScope<1u> hs(self);
54 Handle<mirror::ObjectArray<mirror::String>> array = hs.NewHandle(
55 mirror::ObjectArray<mirror::String>::Alloc(
56 self, GetClassRoot<mirror::ObjectArray<mirror::String>>(), 2 * context_map.size()));
57 if (array == nullptr) {
58 DCHECK(self->IsExceptionPending());
59 return nullptr;
60 }
61 uint32_t i = 0;
62 for (const auto& classpath_to_context : context_map) {
63 const std::string& classpath = classpath_to_context.first;
64 const std::string& context = classpath_to_context.second;
65 if (!append_string(self, array, i, classpath) || !append_string(self, array, i, context)) {
66 return nullptr;
67 }
68 }
69 return soa.AddLocalReference<jobjectArray>(array.Get());
70 }
71
72 static JNINativeMethod gMethods[] = {
73 NATIVE_METHOD(BaseDexClassLoader, computeClassLoaderContextsNative,
74 "()[Ljava/lang/String;"),
75 };
76
register_dalvik_system_BaseDexClassLoader(JNIEnv * env)77 void register_dalvik_system_BaseDexClassLoader(JNIEnv* env) {
78 REGISTER_NATIVE_METHODS("dalvik/system/BaseDexClassLoader");
79 }
80
81 } // namespace art
82