Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 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.h" |
| 33 | |
| 34 | #include <limits> |
| 35 | |
| 36 | #include "android-base/stringprintf.h" |
| 37 | |
| 38 | #include "art_jvmti.h" |
| 39 | #include "base/array_slice.h" |
| 40 | #include "base/logging.h" |
| 41 | #include "dex_file.h" |
| 42 | #include "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 "object_lock.h" |
| 55 | #include "runtime.h" |
| 56 | #include "ScopedLocalRef.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) { |
Alex Light | 7916f20 | 2017-01-27 09:00:15 -0800 | [diff] [blame] | 64 | art::ScopedObjectAccessUnchecked soa(self); |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 65 | art::StackHandleScope<3> hs(self); |
Alex Light | 7916f20 | 2017-01-27 09:00:15 -0800 | [diff] [blame] | 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))); |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 72 | if (java_dex_file_obj.IsNull()) { |
| 73 | return false; |
| 74 | } |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 75 | art::Handle<art::mirror::LongArray> old_cookie(hs.NewHandle(GetDexFileCookie(java_dex_file_obj))); |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 76 | art::Handle<art::mirror::LongArray> cookie(hs.NewHandle( |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 77 | AllocateNewDexFileCookie(self, old_cookie, dex_file))); |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 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 | |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 103 | art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::GetDexFileCookie( |
| 104 | art::Handle<art::mirror::Object> java_dex_file_obj) { |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 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 | // TODO Should I get the class from the classloader or directly? |
| 109 | art::ArtField* internal_cookie_field = java_dex_file_obj->GetClass()->FindDeclaredInstanceField( |
| 110 | "mInternalCookie", "Ljava/lang/Object;"); |
| 111 | // TODO Add check that mCookie is either null or same as mInternalCookie |
| 112 | CHECK(internal_cookie_field != nullptr); |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 113 | return internal_cookie_field->GetObject(java_dex_file_obj.Get())->AsLongArray(); |
| 114 | } |
| 115 | |
| 116 | // TODO Really wishing I had that mirror of java.lang.DexFile now. |
| 117 | art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::AllocateNewDexFileCookie( |
| 118 | art::Thread* self, |
| 119 | art::Handle<art::mirror::LongArray> cookie, |
| 120 | const art::DexFile* dex_file) { |
| 121 | art::StackHandleScope<1> hs(self); |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 122 | CHECK(cookie.Get() != nullptr); |
| 123 | CHECK_GE(cookie->GetLength(), 1); |
| 124 | art::Handle<art::mirror::LongArray> new_cookie( |
| 125 | hs.NewHandle(art::mirror::LongArray::Alloc(self, cookie->GetLength() + 1))); |
| 126 | if (new_cookie.Get() == nullptr) { |
| 127 | self->AssertPendingOOMException(); |
| 128 | return nullptr; |
| 129 | } |
| 130 | // Copy the oat-dex field at the start. |
| 131 | // TODO Should I clear this field? |
| 132 | // TODO This is a really crappy thing here with the first element being different. |
| 133 | new_cookie->SetWithoutChecks<false>(0, cookie->GetWithoutChecks(0)); |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 134 | // This must match the casts in runtime/native/dalvik_system_DexFile.cc:ConvertDexFilesToJavaArray |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 135 | new_cookie->SetWithoutChecks<false>( |
Alex Light | 1babae0 | 2017-02-01 15:35:34 -0800 | [diff] [blame^] | 136 | 1, static_cast<int64_t>(reinterpret_cast<uintptr_t>(dex_file))); |
Alex Light | eb98b08 | 2017-01-25 13:02:32 -0800 | [diff] [blame] | 137 | new_cookie->Memcpy(2, cookie.Get(), 1, cookie->GetLength() - 1); |
| 138 | return new_cookie.Get(); |
| 139 | } |
| 140 | |
| 141 | // TODO This should return the actual source java.lang.DexFile object for the klass being loaded. |
| 142 | art::ObjPtr<art::mirror::Object> ClassLoaderHelper::FindSourceDexFileObject( |
| 143 | art::Thread* self, art::Handle<art::mirror::ClassLoader> loader) { |
| 144 | const char* dex_path_list_element_array_name = "[Ldalvik/system/DexPathList$Element;"; |
| 145 | const char* dex_path_list_element_name = "Ldalvik/system/DexPathList$Element;"; |
| 146 | const char* dex_file_name = "Ldalvik/system/DexFile;"; |
| 147 | const char* dex_path_list_name = "Ldalvik/system/DexPathList;"; |
| 148 | const char* dex_class_loader_name = "Ldalvik/system/BaseDexClassLoader;"; |
| 149 | |
| 150 | CHECK(!self->IsExceptionPending()); |
| 151 | art::StackHandleScope<5> hs(self); |
| 152 | art::ClassLinker* class_linker = art::Runtime::Current()->GetClassLinker(); |
| 153 | |
| 154 | art::Handle<art::mirror::ClassLoader> null_loader(hs.NewHandle<art::mirror::ClassLoader>( |
| 155 | nullptr)); |
| 156 | art::Handle<art::mirror::Class> base_dex_loader_class(hs.NewHandle(class_linker->FindClass( |
| 157 | self, dex_class_loader_name, null_loader))); |
| 158 | |
| 159 | // Get all the ArtFields so we can look in the BaseDexClassLoader |
| 160 | art::ArtField* path_list_field = base_dex_loader_class->FindDeclaredInstanceField( |
| 161 | "pathList", dex_path_list_name); |
| 162 | CHECK(path_list_field != nullptr); |
| 163 | |
| 164 | art::ArtField* dex_path_list_element_field = |
| 165 | class_linker->FindClass(self, dex_path_list_name, null_loader) |
| 166 | ->FindDeclaredInstanceField("dexElements", dex_path_list_element_array_name); |
| 167 | CHECK(dex_path_list_element_field != nullptr); |
| 168 | |
| 169 | art::ArtField* element_dex_file_field = |
| 170 | class_linker->FindClass(self, dex_path_list_element_name, null_loader) |
| 171 | ->FindDeclaredInstanceField("dexFile", dex_file_name); |
| 172 | CHECK(element_dex_file_field != nullptr); |
| 173 | |
| 174 | // Check if loader is a BaseDexClassLoader |
| 175 | art::Handle<art::mirror::Class> loader_class(hs.NewHandle(loader->GetClass())); |
| 176 | // Currently only base_dex_loader is allowed to actually define classes but if this changes in the |
| 177 | // future we should make sure to support all class loader types. |
| 178 | if (!loader_class->IsSubClass(base_dex_loader_class.Get())) { |
| 179 | LOG(ERROR) << "The classloader is not a BaseDexClassLoader which is currently the only " |
| 180 | << "supported class loader type!"; |
| 181 | return nullptr; |
| 182 | } |
| 183 | // Start navigating the fields of the loader (now known to be a BaseDexClassLoader derivative) |
| 184 | art::Handle<art::mirror::Object> path_list( |
| 185 | hs.NewHandle(path_list_field->GetObject(loader.Get()))); |
| 186 | CHECK(path_list.Get() != nullptr); |
| 187 | CHECK(!self->IsExceptionPending()); |
| 188 | art::Handle<art::mirror::ObjectArray<art::mirror::Object>> dex_elements_list(hs.NewHandle( |
| 189 | dex_path_list_element_field->GetObject(path_list.Get())-> |
| 190 | AsObjectArray<art::mirror::Object>())); |
| 191 | CHECK(!self->IsExceptionPending()); |
| 192 | CHECK(dex_elements_list.Get() != nullptr); |
| 193 | size_t num_elements = dex_elements_list->GetLength(); |
| 194 | // Iterate over the DexPathList$Element to find the right one |
| 195 | for (size_t i = 0; i < num_elements; i++) { |
| 196 | art::ObjPtr<art::mirror::Object> current_element = dex_elements_list->Get(i); |
| 197 | CHECK(!current_element.IsNull()); |
| 198 | // TODO It would be cleaner to put the art::DexFile into the dalvik.system.DexFile the class |
| 199 | // comes from but it is more annoying because we would need to find this class. It is not |
| 200 | // necessary for proper function since we just need to be in front of the classes old dex file |
| 201 | // in the path. |
| 202 | art::ObjPtr<art::mirror::Object> first_dex_file( |
| 203 | element_dex_file_field->GetObject(current_element)); |
| 204 | if (!first_dex_file.IsNull()) { |
| 205 | return first_dex_file; |
| 206 | } |
| 207 | } |
| 208 | return nullptr; |
| 209 | } |
| 210 | |
| 211 | } // namespace openjdkjvmti |