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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_VMClassLoader.h"
     18 
     19 #include "class_linker.h"
     20 #include "jni_internal.h"
     21 #include "mirror/class_loader.h"
     22 #include "mirror/object-inl.h"
     23 #include "scoped_fast_native_object_access.h"
     24 #include "ScopedUtfChars.h"
     25 #include "zip_archive.h"
     26 
     27 namespace art {
     28 
     29 static jclass VMClassLoader_findLoadedClass(JNIEnv* env, jclass, jobject javaLoader,
     30                                             jstring javaName) {
     31   ScopedFastNativeObjectAccess soa(env);
     32   mirror::ClassLoader* loader = soa.Decode<mirror::ClassLoader*>(javaLoader);
     33   ScopedUtfChars name(env, javaName);
     34   if (name.c_str() == nullptr) {
     35     return nullptr;
     36   }
     37   ClassLinker* cl = Runtime::Current()->GetClassLinker();
     38   std::string descriptor(DotToDescriptor(name.c_str()));
     39   const size_t descriptor_hash = ComputeModifiedUtf8Hash(descriptor.c_str());
     40   mirror::Class* c = cl->LookupClass(soa.Self(), descriptor.c_str(), descriptor_hash, loader);
     41   if (c != nullptr && c->IsResolved()) {
     42     return soa.AddLocalReference<jclass>(c);
     43   }
     44   // If class is erroneous, throw the earlier failure, wrapped in certain cases. See b/28787733.
     45   if (c != nullptr && c->IsErroneous()) {
     46     cl->ThrowEarlierClassFailure(c);
     47     Thread* self = soa.Self();
     48     mirror::Class* eiie_class =
     49         self->DecodeJObject(WellKnownClasses::java_lang_ExceptionInInitializerError)->AsClass();
     50     mirror::Class* iae_class =
     51         self->DecodeJObject(WellKnownClasses::java_lang_IllegalAccessError)->AsClass();
     52     mirror::Class* ncdfe_class =
     53         self->DecodeJObject(WellKnownClasses::java_lang_NoClassDefFoundError)->AsClass();
     54     mirror::Class* exception = self->GetException()->GetClass();
     55     if (exception == eiie_class || exception == iae_class || exception == ncdfe_class) {
     56       self->ThrowNewWrappedException("Ljava/lang/ClassNotFoundException;",
     57                                      PrettyDescriptor(c).c_str());
     58     }
     59     return nullptr;
     60   }
     61   if (loader != nullptr) {
     62     // Try the common case.
     63     StackHandleScope<1> hs(soa.Self());
     64     cl->FindClassInPathClassLoader(soa, soa.Self(), descriptor.c_str(), descriptor_hash,
     65                                    hs.NewHandle(loader), &c);
     66     if (c != nullptr) {
     67       return soa.AddLocalReference<jclass>(c);
     68     }
     69   }
     70   // Class wasn't resolved so it may be erroneous or not yet ready, force the caller to go into
     71   // the regular loadClass code.
     72   return nullptr;
     73 }
     74 
     75 /*
     76  * Returns an array of entries from the boot classpath that could contain resources.
     77  */
     78 static jobjectArray VMClassLoader_getBootClassPathEntries(JNIEnv* env, jclass) {
     79   const std::vector<const DexFile*>& path =
     80       Runtime::Current()->GetClassLinker()->GetBootClassPath();
     81   jclass stringClass = env->FindClass("java/lang/String");
     82   jobjectArray array = env->NewObjectArray(path.size(), stringClass, nullptr);
     83   for (size_t i = 0; i < path.size(); ++i) {
     84     const DexFile* dex_file = path[i];
     85 
     86     // For multidex locations, e.g., x.jar:classes2.dex, we want to look into x.jar.
     87     const std::string& location(dex_file->GetBaseLocation());
     88 
     89     jstring javaPath = env->NewStringUTF(location.c_str());
     90     env->SetObjectArrayElement(array, i, javaPath);
     91   }
     92   return array;
     93 }
     94 
     95 static JNINativeMethod gMethods[] = {
     96   NATIVE_METHOD(VMClassLoader, findLoadedClass, "!(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;"),
     97   NATIVE_METHOD(VMClassLoader, getBootClassPathEntries, "()[Ljava/lang/String;"),
     98 };
     99 
    100 void register_java_lang_VMClassLoader(JNIEnv* env) {
    101   REGISTER_NATIVE_METHODS("java/lang/VMClassLoader");
    102 }
    103 
    104 }  // namespace art
    105