1 /* Copyright (C) 2017 The Android Open Source Project 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This file implements interfaces from the file jvmti.h. This implementation 5 * is licensed under the same terms as the file jvmti.h. The 6 * copyright and license information for the file jvmti.h follows. 7 * 8 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. 9 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 10 * 11 * This code is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License version 2 only, as 13 * published by the Free Software Foundation. Oracle designates this 14 * particular file as subject to the "Classpath" exception as provided 15 * by Oracle in the LICENSE file that accompanied this code. 16 * 17 * This code is distributed in the hope that it will be useful, but WITHOUT 18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 20 * version 2 for more details (a copy is included in the LICENSE file that 21 * accompanied this code). 22 * 23 * You should have received a copy of the GNU General Public License version 24 * 2 along with this work; if not, write to the Free Software Foundation, 25 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 26 * 27 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 28 * or visit www.oracle.com if you need additional information or have any 29 * questions. 30 */ 31 32 #include "ti_class_loader-inl.h" 33 34 #include <limits> 35 36 #include <android-base/logging.h> 37 #include <android-base/stringprintf.h> 38 39 #include "art_field-inl.h" 40 #include "art_jvmti.h" 41 #include "dex/dex_file.h" 42 #include "dex/dex_file_types.h" 43 #include "events-inl.h" 44 #include "gc/allocation_listener.h" 45 #include "gc/heap.h" 46 #include "instrumentation.h" 47 #include "jit/jit.h" 48 #include "jit/jit_code_cache.h" 49 #include "jni_env_ext-inl.h" 50 #include "jvmti_allocator.h" 51 #include "mirror/class.h" 52 #include "mirror/class_ext.h" 53 #include "mirror/object.h" 54 #include "nativehelper/scoped_local_ref.h" 55 #include "object_lock.h" 56 #include "runtime.h" 57 #include "transform.h" 58 59 namespace openjdkjvmti { 60 61 bool ClassLoaderHelper::AddToClassLoader(art::Thread* self, 62 art::Handle<art::mirror::ClassLoader> loader, 63 const art::DexFile* dex_file) { 64 art::ScopedObjectAccessUnchecked soa(self); 65 art::StackHandleScope<3> hs(self); 66 if (art::ClassLinker::IsBootClassLoader(soa, loader.Get())) { 67 art::Runtime::Current()->GetClassLinker()->AppendToBootClassPath(self, *dex_file); 68 return true; 69 } 70 art::Handle<art::mirror::Object> java_dex_file_obj( 71 hs.NewHandle(FindSourceDexFileObject(self, loader))); 72 if (java_dex_file_obj.IsNull()) { 73 return false; 74 } 75 art::Handle<art::mirror::LongArray> old_cookie(hs.NewHandle(GetDexFileCookie(java_dex_file_obj))); 76 art::Handle<art::mirror::LongArray> cookie(hs.NewHandle( 77 AllocateNewDexFileCookie(self, old_cookie, dex_file))); 78 if (cookie.IsNull()) { 79 return false; 80 } 81 art::ScopedAssertNoThreadSuspension nts("Replacing cookie fields in j.l.DexFile object"); 82 UpdateJavaDexFile(java_dex_file_obj.Get(), cookie.Get()); 83 return true; 84 } 85 86 void ClassLoaderHelper::UpdateJavaDexFile(art::ObjPtr<art::mirror::Object> java_dex_file, 87 art::ObjPtr<art::mirror::LongArray> new_cookie) { 88 art::ArtField* internal_cookie_field = java_dex_file->GetClass()->FindDeclaredInstanceField( 89 "mInternalCookie", "Ljava/lang/Object;"); 90 art::ArtField* cookie_field = java_dex_file->GetClass()->FindDeclaredInstanceField( 91 "mCookie", "Ljava/lang/Object;"); 92 CHECK(internal_cookie_field != nullptr); 93 art::ObjPtr<art::mirror::LongArray> orig_internal_cookie( 94 internal_cookie_field->GetObject(java_dex_file)->AsLongArray()); 95 art::ObjPtr<art::mirror::LongArray> orig_cookie( 96 cookie_field->GetObject(java_dex_file)->AsLongArray()); 97 internal_cookie_field->SetObject<false>(java_dex_file, new_cookie); 98 if (!orig_cookie.IsNull()) { 99 cookie_field->SetObject<false>(java_dex_file, new_cookie); 100 } 101 } 102 103 art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::GetDexFileCookie( 104 art::Handle<art::mirror::Object> java_dex_file_obj) { 105 // mCookie is nulled out if the DexFile has been closed but mInternalCookie sticks around until 106 // the object is finalized. Since they always point to the same array if mCookie is not null we 107 // just use the mInternalCookie field. We will update one or both of these fields later. 108 art::ArtField* internal_cookie_field = java_dex_file_obj->GetClass()->FindDeclaredInstanceField( 109 "mInternalCookie", "Ljava/lang/Object;"); 110 // TODO Add check that mCookie is either null or same as mInternalCookie 111 CHECK(internal_cookie_field != nullptr); 112 return internal_cookie_field->GetObject(java_dex_file_obj.Get())->AsLongArray(); 113 } 114 115 art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::AllocateNewDexFileCookie( 116 art::Thread* self, 117 art::Handle<art::mirror::LongArray> cookie, 118 const art::DexFile* dex_file) { 119 art::StackHandleScope<1> hs(self); 120 CHECK(cookie != nullptr); 121 CHECK_GE(cookie->GetLength(), 1); 122 art::Handle<art::mirror::LongArray> new_cookie( 123 hs.NewHandle(art::mirror::LongArray::Alloc(self, cookie->GetLength() + 1))); 124 if (new_cookie == nullptr) { 125 self->AssertPendingOOMException(); 126 return nullptr; 127 } 128 // Copy the oat-dex field at the start. 129 new_cookie->SetWithoutChecks<false>(0, cookie->GetWithoutChecks(0)); 130 // This must match the casts in runtime/native/dalvik_system_DexFile.cc:ConvertDexFilesToJavaArray 131 new_cookie->SetWithoutChecks<false>( 132 1, static_cast<int64_t>(reinterpret_cast<uintptr_t>(dex_file))); 133 new_cookie->Memcpy(2, cookie.Get(), 1, cookie->GetLength() - 1); 134 return new_cookie.Get(); 135 } 136 137 art::ObjPtr<art::mirror::ObjectArray<art::mirror::Object>> ClassLoaderHelper::GetDexElementList( 138 art::Thread* self, 139 art::Handle<art::mirror::ClassLoader> loader) { 140 art::StackHandleScope<4> hs(self); 141 142 art::Handle<art::mirror::Class> 143 base_dex_loader_class(hs.NewHandle(self->DecodeJObject( 144 art::WellKnownClasses::dalvik_system_BaseDexClassLoader)->AsClass())); 145 146 // Get all the ArtFields so we can look in the BaseDexClassLoader 147 art::ArtField* path_list_field = art::jni::DecodeArtField( 148 art::WellKnownClasses::dalvik_system_BaseDexClassLoader_pathList); 149 art::ArtField* dex_path_list_element_field = 150 art::jni::DecodeArtField(art::WellKnownClasses::dalvik_system_DexPathList_dexElements); 151 152 // Check if loader is a BaseDexClassLoader 153 art::Handle<art::mirror::Class> loader_class(hs.NewHandle(loader->GetClass())); 154 // Currently only base_dex_loader is allowed to actually define classes but if this changes in the 155 // future we should make sure to support all class loader types. 156 if (!loader_class->IsSubClass(base_dex_loader_class.Get())) { 157 LOG(ERROR) << "The classloader " << loader_class->PrettyClass() << " is not a " 158 << base_dex_loader_class->PrettyClass() << " which is currently the only " 159 << "supported class loader type!"; 160 return nullptr; 161 } 162 // Start navigating the fields of the loader (now known to be a BaseDexClassLoader derivative) 163 art::Handle<art::mirror::Object> path_list( 164 hs.NewHandle(path_list_field->GetObject(loader.Get()))); 165 CHECK(path_list != nullptr); 166 art::ObjPtr<art::mirror::ObjectArray<art::mirror::Object>> dex_elements_list = 167 dex_path_list_element_field->GetObject(path_list.Get())->AsObjectArray<art::mirror::Object>(); 168 return dex_elements_list; 169 } 170 171 // TODO This should return the actual source java.lang.DexFile object for the klass being loaded. 172 art::ObjPtr<art::mirror::Object> ClassLoaderHelper::FindSourceDexFileObject( 173 art::Thread* self, art::Handle<art::mirror::ClassLoader> loader) { 174 art::ObjPtr<art::mirror::Object> res = nullptr; 175 VisitDexFileObjects(self, 176 loader, 177 [&] (art::ObjPtr<art::mirror::Object> dex_file) { 178 res = dex_file; 179 // Just stop at the first one. 180 // TODO It would be cleaner to put the art::DexFile into the 181 // dalvik.system.DexFile the class comes from but it is more annoying 182 // because we would need to find this class. It is not necessary for proper 183 // function since we just need to be in front of the classes old dex file in 184 // the path. 185 return false; 186 }); 187 return res; 188 } 189 190 } // namespace openjdkjvmti 191
