1 /*
2 * Copyright (C) 2008 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 "dex_file.h"
18 #include "mirror/dex_cache.h"
19 #include "mirror/object-inl.h"
20 #include "scoped_fast_native_object_access.h"
21 #include "well_known_classes.h"
22
23 namespace art {
24
DexCache_getDexNative(JNIEnv * env,jobject javaDexCache)25 static jobject DexCache_getDexNative(JNIEnv* env, jobject javaDexCache) {
26 ScopedFastNativeObjectAccess soa(env);
27 mirror::DexCache* dex_cache = soa.Decode<mirror::DexCache*>(javaDexCache);
28 // Should only be called while holding the lock on the dex cache.
29 DCHECK_EQ(dex_cache->GetLockOwnerThreadId(), soa.Self()->GetThreadId());
30 const DexFile* dex_file = dex_cache->GetDexFile();
31 if (dex_file == NULL) {
32 return NULL;
33 }
34 void* address = const_cast<void*>(reinterpret_cast<const void*>(dex_file->Begin()));
35 jobject byte_buffer = env->NewDirectByteBuffer(address, dex_file->Size());
36 if (byte_buffer == NULL) {
37 DCHECK(soa.Self()->IsExceptionPending());
38 return NULL;
39 }
40
41 jvalue args[1];
42 args[0].l = byte_buffer;
43 return env->CallStaticObjectMethodA(WellKnownClasses::com_android_dex_Dex,
44 WellKnownClasses::com_android_dex_Dex_create,
45 args);
46 }
47
48 static JNINativeMethod gMethods[] = {
49 NATIVE_METHOD(DexCache, getDexNative, "!()Lcom/android/dex/Dex;"),
50 };
51
register_java_lang_DexCache(JNIEnv * env)52 void register_java_lang_DexCache(JNIEnv* env) {
53 REGISTER_NATIVE_METHODS("java/lang/DexCache");
54 }
55
56 } // namespace art
57