1 /* 2 * Copyright (C) 2012 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-inl.h" 18 #include "base/logging.h" 19 #include "entrypoints/entrypoint_utils.h" 20 #include "mirror/object-inl.h" 21 #include "scoped_thread_state_change.h" 22 #include "thread.h" 23 24 namespace art { 25 26 // Used by the JNI dlsym stub to find the native method to invoke if none is registered. 27 #if defined(__arm__) || defined(__aarch64__) 28 extern "C" void* artFindNativeMethod() { 29 Thread* self = Thread::Current(); 30 #else 31 extern "C" void* artFindNativeMethod(Thread* self) { 32 DCHECK_EQ(self, Thread::Current()); 33 #endif 34 Locks::mutator_lock_->AssertNotHeld(self); // We come here as Native. 35 ScopedObjectAccess soa(self); 36 37 ArtMethod* method = self->GetCurrentMethod(nullptr); 38 DCHECK(method != nullptr); 39 40 // Lookup symbol address for method, on failure we'll return null with an exception set, 41 // otherwise we return the address of the method we found. 42 void* native_code = soa.Vm()->FindCodeForNativeMethod(method); 43 if (native_code == nullptr) { 44 DCHECK(self->IsExceptionPending()); 45 return nullptr; 46 } else { 47 // Register so that future calls don't come here 48 method->RegisterNative(native_code, false); 49 return native_code; 50 } 51 } 52 53 } // namespace art 54
