1 /* 2 * Copyright (C) 2015 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 "art_method.h" 18 #include "base/enums.h" 19 #include "jni.h" 20 #include "mirror/array-inl.h" 21 #include "mirror/class-inl.h" 22 #include "mirror/dex_cache-inl.h" 23 #include "scoped_thread_state_change-inl.h" 24 #include "stack.h" 25 #include "thread.h" 26 27 namespace art { 28 29 namespace { 30 31 extern "C" JNIEXPORT jobject JNICALL Java_Main_cloneResolvedMethods(JNIEnv* env, 32 jclass, 33 jclass cls) { 34 ScopedObjectAccess soa(Thread::Current()); 35 mirror::DexCache* dex_cache = soa.Decode<mirror::Class>(cls)->GetDexCache(); 36 size_t num_methods = dex_cache->NumResolvedMethods(); 37 mirror::MethodDexCacheType* methods = dex_cache->GetResolvedMethods(); 38 CHECK_EQ(num_methods != 0u, methods != nullptr); 39 if (num_methods == 0u) { 40 return nullptr; 41 } 42 jarray array; 43 if (sizeof(void*) == 4) { 44 array = env->NewIntArray(2u * num_methods); 45 } else { 46 array = env->NewLongArray(2u * num_methods); 47 } 48 CHECK(array != nullptr); 49 ObjPtr<mirror::Array> decoded_array = soa.Decode<mirror::Array>(array); 50 for (size_t i = 0; i != num_methods; ++i) { 51 auto pair = mirror::DexCache::GetNativePairPtrSize(methods, i, kRuntimePointerSize); 52 uint32_t index = pair.index; 53 ArtMethod* method = pair.object; 54 if (sizeof(void*) == 4) { 55 ObjPtr<mirror::IntArray> int_array = down_cast<mirror::IntArray*>(decoded_array.Ptr()); 56 int_array->Set(2u * i, index); 57 int_array->Set(2u * i + 1u, static_cast<jint>(reinterpret_cast<uintptr_t>(method))); 58 } else { 59 ObjPtr<mirror::LongArray> long_array = down_cast<mirror::LongArray*>(decoded_array.Ptr()); 60 long_array->Set(2u * i, index); 61 long_array->Set(2u * i + 1u, reinterpret_cast64<jlong>(method)); 62 } 63 } 64 return array; 65 } 66 67 extern "C" JNIEXPORT void JNICALL Java_Main_restoreResolvedMethods( 68 JNIEnv*, jclass, jclass cls, jobject old_cache) { 69 ScopedObjectAccess soa(Thread::Current()); 70 mirror::DexCache* dex_cache = soa.Decode<mirror::Class>(cls)->GetDexCache(); 71 size_t num_methods = dex_cache->NumResolvedMethods(); 72 mirror::MethodDexCacheType* methods = 73 soa.Decode<mirror::Class>(cls)->GetDexCache()->GetResolvedMethods(); 74 CHECK_EQ(num_methods != 0u, methods != nullptr); 75 ObjPtr<mirror::Array> old = soa.Decode<mirror::Array>(old_cache); 76 CHECK_EQ(methods != nullptr, old != nullptr); 77 CHECK_EQ(num_methods, static_cast<size_t>(old->GetLength())); 78 for (size_t i = 0; i != num_methods; ++i) { 79 uint32_t index; 80 ArtMethod* method; 81 if (sizeof(void*) == 4) { 82 ObjPtr<mirror::IntArray> int_array = down_cast<mirror::IntArray*>(old.Ptr()); 83 index = static_cast<uint32_t>(int_array->Get(2u * i)); 84 method = reinterpret_cast<ArtMethod*>(static_cast<uint32_t>(int_array->Get(2u * i + 1u))); 85 } else { 86 ObjPtr<mirror::LongArray> long_array = down_cast<mirror::LongArray*>(old.Ptr()); 87 index = dchecked_integral_cast<uint32_t>(long_array->Get(2u * i)); 88 method = reinterpret_cast64<ArtMethod*>(long_array->Get(2u * i + 1u)); 89 } 90 mirror::MethodDexCachePair pair(method, index); 91 mirror::DexCache::SetNativePairPtrSize(methods, i, pair, kRuntimePointerSize); 92 } 93 } 94 95 } // namespace 96 97 } // namespace art 98
