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