java_lang_VMClassLoader.cc revision 194116c836080de14245a3a7c4617d07b8abf8cf
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 "jni_internal.h" 19#include "mirror/class_loader.h" 20#include "mirror/object-inl.h" 21#include "scoped_fast_native_object_access.h" 22#include "ScopedUtfChars.h" 23#include "zip_archive.h" 24 25namespace art { 26 27static jclass VMClassLoader_findLoadedClass(JNIEnv* env, jclass, jobject javaLoader, jstring javaName) { 28 ScopedFastNativeObjectAccess soa(env); 29 mirror::ClassLoader* loader = soa.Decode<mirror::ClassLoader*>(javaLoader); 30 ScopedUtfChars name(env, javaName); 31 if (name.c_str() == NULL) { 32 return NULL; 33 } 34 ClassLinker* cl = Runtime::Current()->GetClassLinker(); 35 std::string descriptor(DotToDescriptor(name.c_str())); 36 mirror::Class* c = cl->LookupClass(descriptor.c_str(), loader); 37 if (c != NULL && c->IsResolved()) { 38 return soa.AddLocalReference<jclass>(c); 39 } 40 if (loader != nullptr) { 41 // Try the common case. 42 StackHandleScope<1> hs(soa.Self()); 43 c = cl->FindClassInPathClassLoader(soa, soa.Self(), descriptor.c_str(), hs.NewHandle(loader)); 44 if (c != nullptr) { 45 return soa.AddLocalReference<jclass>(c); 46 } 47 } 48 // Class wasn't resolved so it may be erroneous or not yet ready, force the caller to go into 49 // the regular loadClass code. 50 return NULL; 51} 52 53static jint VMClassLoader_getBootClassPathSize(JNIEnv*, jclass) { 54 return Runtime::Current()->GetClassLinker()->GetBootClassPath().size(); 55} 56 57/* 58 * Returns a string URL for a resource with the specified 'javaName' in 59 * entry 'index' of the boot class path. 60 * 61 * We return a newly-allocated String in the following form: 62 * 63 * jar:file://path!/name 64 * 65 * Where "path" is the bootstrap class path entry and "name" is the string 66 * passed into this method. "path" needs to be an absolute path (starting 67 * with '/'); if it's not we'd need to make it absolute as part of forming 68 * the URL string. 69 */ 70static jstring VMClassLoader_getBootClassPathResource(JNIEnv* env, jclass, jstring javaName, jint index) { 71 ScopedUtfChars name(env, javaName); 72 if (name.c_str() == nullptr) { 73 return nullptr; 74 } 75 76 const std::vector<const DexFile*>& path = Runtime::Current()->GetClassLinker()->GetBootClassPath(); 77 if (index < 0 || size_t(index) >= path.size()) { 78 return nullptr; 79 } 80 const DexFile* dex_file = path[index]; 81 82 // For multidex locations, e.g., x.jar:classes2.dex, we want to look into x.jar. 83 const std::string& location(dex_file->GetBaseLocation()); 84 85 std::string error_msg; 86 std::unique_ptr<ZipArchive> zip_archive(ZipArchive::Open(location.c_str(), &error_msg)); 87 if (zip_archive.get() == nullptr) { 88 LOG(WARNING) << "Failed to open zip archive '" << location << "': " << error_msg; 89 return nullptr; 90 } 91 std::unique_ptr<ZipEntry> zip_entry(zip_archive->Find(name.c_str(), &error_msg)); 92 if (zip_entry.get() == nullptr) { 93 return nullptr; 94 } 95 96 std::string url; 97 StringAppendF(&url, "jar:file://%s!/%s", location.c_str(), name.c_str()); 98 return env->NewStringUTF(url.c_str()); 99} 100 101static JNINativeMethod gMethods[] = { 102 NATIVE_METHOD(VMClassLoader, findLoadedClass, "!(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;"), 103 NATIVE_METHOD(VMClassLoader, getBootClassPathResource, "(Ljava/lang/String;I)Ljava/lang/String;"), 104 NATIVE_METHOD(VMClassLoader, getBootClassPathSize, "!()I"), 105}; 106 107void register_java_lang_VMClassLoader(JNIEnv* env) { 108 REGISTER_NATIVE_METHODS("java/lang/VMClassLoader"); 109} 110 111} // namespace art 112