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