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 "class_linker.h" 18 #include "dex_file-inl.h" 19 #include "jni_internal.h" 20 #include "nth_caller_visitor.h" 21 #include "mirror/class-inl.h" 22 #include "mirror/class_loader.h" 23 #include "mirror/object-inl.h" 24 #include "scoped_thread_state_change.h" 25 #include "scoped_fast_native_object_access.h" 26 #include "ScopedLocalRef.h" 27 #include "ScopedUtfChars.h" 28 #include "well_known_classes.h" 29 30 namespace art { 31 32 static mirror::Class* DecodeClass(const ScopedFastNativeObjectAccess& soa, jobject java_class) 33 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 34 mirror::Class* c = soa.Decode<mirror::Class*>(java_class); 35 DCHECK(c != NULL); 36 DCHECK(c->IsClass()); 37 // TODO: we could EnsureInitialized here, rather than on every reflective get/set or invoke . 38 // For now, we conservatively preserve the old dalvik behavior. A quick "IsInitialized" check 39 // every time probably doesn't make much difference to reflection performance anyway. 40 return c; 41 } 42 43 // "name" is in "binary name" format, e.g. "dalvik.system.Debug$1". 44 static jclass Class_classForName(JNIEnv* env, jclass, jstring javaName, jboolean initialize, 45 jobject javaLoader) { 46 ScopedFastNativeObjectAccess soa(env); 47 ScopedUtfChars name(env, javaName); 48 if (name.c_str() == nullptr) { 49 return nullptr; 50 } 51 52 // We need to validate and convert the name (from x.y.z to x/y/z). This 53 // is especially handy for array types, since we want to avoid 54 // auto-generating bogus array classes. 55 if (!IsValidBinaryClassName(name.c_str())) { 56 ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow(); 57 soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/lang/ClassNotFoundException;", 58 "Invalid name: %s", name.c_str()); 59 return nullptr; 60 } 61 62 std::string descriptor(DotToDescriptor(name.c_str())); 63 StackHandleScope<2> hs(soa.Self()); 64 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(soa.Decode<mirror::ClassLoader*>(javaLoader))); 65 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 66 Handle<mirror::Class> c( 67 hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor.c_str(), class_loader))); 68 if (c.Get() == nullptr) { 69 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 70 env->ExceptionClear(); 71 jthrowable cnfe = reinterpret_cast<jthrowable>(env->NewObject(WellKnownClasses::java_lang_ClassNotFoundException, 72 WellKnownClasses::java_lang_ClassNotFoundException_init, 73 javaName, cause.get())); 74 if (cnfe != nullptr) { 75 // Make sure allocation didn't fail with an OOME. 76 env->Throw(cnfe); 77 } 78 return nullptr; 79 } 80 if (initialize) { 81 class_linker->EnsureInitialized(c, true, true); 82 } 83 return soa.AddLocalReference<jclass>(c.Get()); 84 } 85 86 static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) { 87 ScopedFastNativeObjectAccess soa(env); 88 StackHandleScope<1> hs(soa.Self()); 89 mirror::Class* const c = DecodeClass(soa, javaThis); 90 return soa.AddLocalReference<jstring>(mirror::Class::ComputeName(hs.NewHandle(c))); 91 } 92 93 static jobjectArray Class_getProxyInterfaces(JNIEnv* env, jobject javaThis) { 94 ScopedFastNativeObjectAccess soa(env); 95 mirror::Class* c = DecodeClass(soa, javaThis); 96 return soa.AddLocalReference<jobjectArray>(c->GetInterfaces()->Clone(soa.Self())); 97 } 98 99 static JNINativeMethod gMethods[] = { 100 NATIVE_METHOD(Class, classForName, "!(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"), 101 NATIVE_METHOD(Class, getNameNative, "!()Ljava/lang/String;"), 102 NATIVE_METHOD(Class, getProxyInterfaces, "!()[Ljava/lang/Class;"), 103 }; 104 105 void register_java_lang_Class(JNIEnv* env) { 106 REGISTER_NATIVE_METHODS("java/lang/Class"); 107 } 108 109 } // namespace art 110