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      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 "java_lang_reflect_Method.h"
     18 
     19 #include "art_method-inl.h"
     20 #include "class_linker.h"
     21 #include "class_linker-inl.h"
     22 #include "jni_internal.h"
     23 #include "mirror/class-inl.h"
     24 #include "mirror/object-inl.h"
     25 #include "mirror/object_array-inl.h"
     26 #include "reflection.h"
     27 #include "scoped_fast_native_object_access.h"
     28 #include "well_known_classes.h"
     29 
     30 namespace art {
     31 
     32 static jobject Method_getAnnotationNative(JNIEnv* env, jobject javaMethod, jclass annotationType) {
     33   ScopedFastNativeObjectAccess soa(env);
     34   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
     35   if (method->GetDeclaringClass()->IsProxyClass()) {
     36     return nullptr;
     37   }
     38   StackHandleScope<1> hs(soa.Self());
     39   Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class*>(annotationType)));
     40   return soa.AddLocalReference<jobject>(
     41       method->GetDexFile()->GetAnnotationForMethod(method, klass));
     42 }
     43 
     44 static jobject Method_getDefaultValue(JNIEnv* env, jobject javaMethod) {
     45   ScopedFastNativeObjectAccess soa(env);
     46   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
     47   if (!method->GetDeclaringClass()->IsAnnotation()) {
     48     return nullptr;
     49   }
     50   return soa.AddLocalReference<jobject>(method->GetDexFile()->GetAnnotationDefaultValue(method));
     51 }
     52 
     53 static jobjectArray Method_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
     54   ScopedFastNativeObjectAccess soa(env);
     55   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
     56   if (method->GetDeclaringClass()->IsProxyClass()) {
     57     mirror::Class* klass = method->GetDeclaringClass();
     58     int throws_index = -1;
     59     size_t i = 0;
     60     for (const auto& m : klass->GetDeclaredVirtualMethods(sizeof(void*))) {
     61       if (&m == method) {
     62         throws_index = i;
     63         break;
     64       }
     65       ++i;
     66     }
     67     CHECK_NE(throws_index, -1);
     68     mirror::ObjectArray<mirror::Class>* declared_exceptions = klass->GetThrows()->Get(throws_index);
     69     return soa.AddLocalReference<jobjectArray>(declared_exceptions->Clone(soa.Self()));
     70   } else {
     71     mirror::ObjectArray<mirror::Class>* result_array =
     72         method->GetDexFile()->GetExceptionTypesForMethod(method);
     73     if (result_array == nullptr) {
     74       // Return an empty array instead of a null pointer
     75       mirror::Class* class_class = mirror::Class::GetJavaLangClass();
     76       mirror::Class* class_array_class =
     77           Runtime::Current()->GetClassLinker()->FindArrayClass(soa.Self(), &class_class);
     78       if (class_array_class == nullptr) {
     79         return nullptr;
     80       }
     81       mirror::ObjectArray<mirror::Class>* empty_array =
     82           mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
     83       return soa.AddLocalReference<jobjectArray>(empty_array);
     84     } else {
     85       return soa.AddLocalReference<jobjectArray>(result_array);
     86     }
     87   }
     88 }
     89 
     90 static jobjectArray Method_getParameterAnnotationsNative(JNIEnv* env, jobject javaMethod) {
     91   ScopedFastNativeObjectAccess soa(env);
     92   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
     93   if (method->GetDeclaringClass()->IsProxyClass()) {
     94     return nullptr;
     95   }
     96   return soa.AddLocalReference<jobjectArray>(method->GetDexFile()->GetParameterAnnotations(method));
     97 }
     98 
     99 static jobject Method_invoke(JNIEnv* env, jobject javaMethod, jobject javaReceiver,
    100                              jobject javaArgs) {
    101   ScopedFastNativeObjectAccess soa(env);
    102   return InvokeMethod(soa, javaMethod, javaReceiver, javaArgs);
    103 }
    104 
    105 static JNINativeMethod gMethods[] = {
    106   NATIVE_METHOD(Method, getAnnotationNative,
    107                 "!(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"),
    108   NATIVE_METHOD(Method, getDefaultValue, "!()Ljava/lang/Object;"),
    109   NATIVE_METHOD(Method, getExceptionTypes, "!()[Ljava/lang/Class;"),
    110   NATIVE_METHOD(Method, getParameterAnnotationsNative, "!()[[Ljava/lang/annotation/Annotation;"),
    111   NATIVE_METHOD(Method, invoke, "!(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;"),
    112 };
    113 
    114 void register_java_lang_reflect_Method(JNIEnv* env) {
    115   REGISTER_NATIVE_METHODS("java/lang/reflect/Method");
    116 }
    117 
    118 }  // namespace art
    119