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/* 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/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
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