| /* Copyright (C) 2017 The Android Open Source Project |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This file implements interfaces from the file jvmti.h. This implementation |
| * is licensed under the same terms as the file jvmti.h. The |
| * copyright and license information for the file jvmti.h follows. |
| * |
| * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "ti_class_loader-inl.h" |
| |
| #include <limits> |
| |
| #include <android-base/logging.h> |
| #include <android-base/stringprintf.h> |
| |
| #include "art_field-inl.h" |
| #include "art_jvmti.h" |
| #include "dex/dex_file.h" |
| #include "dex/dex_file_types.h" |
| #include "events-inl.h" |
| #include "gc/allocation_listener.h" |
| #include "gc/heap.h" |
| #include "instrumentation.h" |
| #include "jit/jit.h" |
| #include "jit/jit_code_cache.h" |
| #include "jni_env_ext-inl.h" |
| #include "jvmti_allocator.h" |
| #include "mirror/class.h" |
| #include "mirror/class_ext.h" |
| #include "mirror/object.h" |
| #include "nativehelper/scoped_local_ref.h" |
| #include "object_lock.h" |
| #include "runtime.h" |
| #include "transform.h" |
| |
| namespace openjdkjvmti { |
| |
| bool ClassLoaderHelper::AddToClassLoader(art::Thread* self, |
| art::Handle<art::mirror::ClassLoader> loader, |
| const art::DexFile* dex_file) { |
| art::ScopedObjectAccessUnchecked soa(self); |
| art::StackHandleScope<3> hs(self); |
| if (art::ClassLinker::IsBootClassLoader(soa, loader.Get())) { |
| art::Runtime::Current()->GetClassLinker()->AppendToBootClassPath(self, *dex_file); |
| return true; |
| } |
| art::Handle<art::mirror::Object> java_dex_file_obj( |
| hs.NewHandle(FindSourceDexFileObject(self, loader))); |
| if (java_dex_file_obj.IsNull()) { |
| return false; |
| } |
| art::Handle<art::mirror::LongArray> old_cookie(hs.NewHandle(GetDexFileCookie(java_dex_file_obj))); |
| art::Handle<art::mirror::LongArray> cookie(hs.NewHandle( |
| AllocateNewDexFileCookie(self, old_cookie, dex_file))); |
| if (cookie.IsNull()) { |
| return false; |
| } |
| art::ScopedAssertNoThreadSuspension nts("Replacing cookie fields in j.l.DexFile object"); |
| UpdateJavaDexFile(java_dex_file_obj.Get(), cookie.Get()); |
| return true; |
| } |
| |
| void ClassLoaderHelper::UpdateJavaDexFile(art::ObjPtr<art::mirror::Object> java_dex_file, |
| art::ObjPtr<art::mirror::LongArray> new_cookie) { |
| art::ArtField* internal_cookie_field = java_dex_file->GetClass()->FindDeclaredInstanceField( |
| "mInternalCookie", "Ljava/lang/Object;"); |
| art::ArtField* cookie_field = java_dex_file->GetClass()->FindDeclaredInstanceField( |
| "mCookie", "Ljava/lang/Object;"); |
| CHECK(internal_cookie_field != nullptr); |
| art::ObjPtr<art::mirror::LongArray> orig_internal_cookie( |
| internal_cookie_field->GetObject(java_dex_file)->AsLongArray()); |
| art::ObjPtr<art::mirror::LongArray> orig_cookie( |
| cookie_field->GetObject(java_dex_file)->AsLongArray()); |
| internal_cookie_field->SetObject<false>(java_dex_file, new_cookie); |
| if (!orig_cookie.IsNull()) { |
| cookie_field->SetObject<false>(java_dex_file, new_cookie); |
| } |
| } |
| |
| art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::GetDexFileCookie( |
| art::Handle<art::mirror::Object> java_dex_file_obj) { |
| // mCookie is nulled out if the DexFile has been closed but mInternalCookie sticks around until |
| // the object is finalized. Since they always point to the same array if mCookie is not null we |
| // just use the mInternalCookie field. We will update one or both of these fields later. |
| art::ArtField* internal_cookie_field = java_dex_file_obj->GetClass()->FindDeclaredInstanceField( |
| "mInternalCookie", "Ljava/lang/Object;"); |
| // TODO Add check that mCookie is either null or same as mInternalCookie |
| CHECK(internal_cookie_field != nullptr); |
| return internal_cookie_field->GetObject(java_dex_file_obj.Get())->AsLongArray(); |
| } |
| |
| art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::AllocateNewDexFileCookie( |
| art::Thread* self, |
| art::Handle<art::mirror::LongArray> cookie, |
| const art::DexFile* dex_file) { |
| art::StackHandleScope<1> hs(self); |
| CHECK(cookie != nullptr); |
| CHECK_GE(cookie->GetLength(), 1); |
| art::Handle<art::mirror::LongArray> new_cookie( |
| hs.NewHandle(art::mirror::LongArray::Alloc(self, cookie->GetLength() + 1))); |
| if (new_cookie == nullptr) { |
| self->AssertPendingOOMException(); |
| return nullptr; |
| } |
| // Copy the oat-dex field at the start. |
| new_cookie->SetWithoutChecks<false>(0, cookie->GetWithoutChecks(0)); |
| // This must match the casts in runtime/native/dalvik_system_DexFile.cc:ConvertDexFilesToJavaArray |
| new_cookie->SetWithoutChecks<false>( |
| 1, static_cast<int64_t>(reinterpret_cast<uintptr_t>(dex_file))); |
| new_cookie->Memcpy(2, cookie.Get(), 1, cookie->GetLength() - 1); |
| return new_cookie.Get(); |
| } |
| |
| art::ObjPtr<art::mirror::ObjectArray<art::mirror::Object>> ClassLoaderHelper::GetDexElementList( |
| art::Thread* self, |
| art::Handle<art::mirror::ClassLoader> loader) { |
| art::StackHandleScope<4> hs(self); |
| |
| art::Handle<art::mirror::Class> |
| base_dex_loader_class(hs.NewHandle(self->DecodeJObject( |
| art::WellKnownClasses::dalvik_system_BaseDexClassLoader)->AsClass())); |
| |
| // Get all the ArtFields so we can look in the BaseDexClassLoader |
| art::ArtField* path_list_field = art::jni::DecodeArtField( |
| art::WellKnownClasses::dalvik_system_BaseDexClassLoader_pathList); |
| art::ArtField* dex_path_list_element_field = |
| art::jni::DecodeArtField(art::WellKnownClasses::dalvik_system_DexPathList_dexElements); |
| |
| // Check if loader is a BaseDexClassLoader |
| art::Handle<art::mirror::Class> loader_class(hs.NewHandle(loader->GetClass())); |
| // Currently only base_dex_loader is allowed to actually define classes but if this changes in the |
| // future we should make sure to support all class loader types. |
| if (!loader_class->IsSubClass(base_dex_loader_class.Get())) { |
| LOG(ERROR) << "The classloader " << loader_class->PrettyClass() << " is not a " |
| << base_dex_loader_class->PrettyClass() << " which is currently the only " |
| << "supported class loader type!"; |
| return nullptr; |
| } |
| // Start navigating the fields of the loader (now known to be a BaseDexClassLoader derivative) |
| art::Handle<art::mirror::Object> path_list( |
| hs.NewHandle(path_list_field->GetObject(loader.Get()))); |
| CHECK(path_list != nullptr); |
| art::ObjPtr<art::mirror::ObjectArray<art::mirror::Object>> dex_elements_list = |
| dex_path_list_element_field->GetObject(path_list.Get())->AsObjectArray<art::mirror::Object>(); |
| return dex_elements_list; |
| } |
| |
| // TODO This should return the actual source java.lang.DexFile object for the klass being loaded. |
| art::ObjPtr<art::mirror::Object> ClassLoaderHelper::FindSourceDexFileObject( |
| art::Thread* self, art::Handle<art::mirror::ClassLoader> loader) { |
| art::ObjPtr<art::mirror::Object> res = nullptr; |
| VisitDexFileObjects(self, |
| loader, |
| [&] (art::ObjPtr<art::mirror::Object> dex_file) { |
| res = dex_file; |
| // Just stop at the first one. |
| // TODO It would be cleaner to put the art::DexFile into the |
| // dalvik.system.DexFile the class comes from but it is more annoying |
| // because we would need to find this class. It is not necessary for proper |
| // function since we just need to be in front of the classes old dex file in |
| // the path. |
| return false; |
| }); |
| return res; |
| } |
| |
| } // namespace openjdkjvmti |