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      1 /*
      2  * Copyright (C) 2017 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 "runtime_intrinsics.h"
     18 
     19 #include "art_method-inl.h"
     20 #include "class_linker.h"
     21 #include "dex/invoke_type.h"
     22 #include "intrinsics_enum.h"
     23 #include "mirror/class.h"
     24 #include "runtime.h"
     25 #include "scoped_thread_state_change-inl.h"
     26 #include "thread.h"
     27 
     28 namespace art {
     29 
     30 namespace {
     31 
     32 // Initialize an intrinsic. Returns true if the intrinsic is already
     33 // initialized, false otherwise.
     34 bool InitializeIntrinsic(Thread* self,
     35                          Intrinsics intrinsic,
     36                          InvokeType invoke_type,
     37                          const char* class_name,
     38                          const char* method_name,
     39                          const char* signature)
     40     REQUIRES_SHARED(Locks::mutator_lock_) {
     41   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
     42   PointerSize image_size = class_linker->GetImagePointerSize();
     43   ObjPtr<mirror::Class> cls = class_linker->FindSystemClass(self, class_name);
     44   if (cls == nullptr) {
     45     LOG(FATAL) << "Could not find class of intrinsic " << class_name;
     46   }
     47 
     48   ArtMethod* method = cls->FindClassMethod(method_name, signature, image_size);
     49   if (method == nullptr || method->GetDeclaringClass() != cls) {
     50     LOG(FATAL) << "Could not find method of intrinsic "
     51                << class_name << " " << method_name << " " << signature;
     52   }
     53 
     54   CHECK_EQ(method->GetInvokeType(), invoke_type);
     55   if (method->IsIntrinsic()) {
     56     CHECK_EQ(method->GetIntrinsic(), static_cast<uint32_t>(intrinsic));
     57     return true;
     58   } else {
     59     method->SetIntrinsic(static_cast<uint32_t>(intrinsic));
     60     return false;
     61   }
     62 }
     63 
     64 }  // namespace
     65 
     66 void InitializeIntrinsics() {
     67   ScopedObjectAccess soa(Thread::Current());
     68   // Initialization here uses the short-circuit operator || to stop
     69   // initializing if there's an already initialized intrinsic.
     70 #define SETUP_INTRINSICS(Name, InvokeType, _, __, ___, ClassName, MethodName, Signature) \
     71   InitializeIntrinsic(soa.Self(),                                                        \
     72                       Intrinsics::k##Name,                                               \
     73                       InvokeType,                                                        \
     74                       ClassName,                                                         \
     75                       MethodName,                                                        \
     76                       Signature) ||
     77 #include "intrinsics_list.h"
     78   INTRINSICS_LIST(SETUP_INTRINSICS)
     79 #undef INTRINSICS_LIST
     80 #undef SETUP_INTRINSICS
     81       true;
     82 }
     83 
     84 }  // namespace art
     85