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/* Copyright (C) 2016 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 "transform.h"
#include <stddef.h>
#include <sys/types.h>
#include <unordered_map>
#include <unordered_set>
#include "art_method.h"
#include "base/array_ref.h"
#include "base/globals.h"
#include "base/logging.h"
#include "base/mem_map.h"
#include "class_linker.h"
#include "dex/dex_file.h"
#include "dex/dex_file_types.h"
#include "dex/utf.h"
#include "events-inl.h"
#include "events.h"
#include "fault_handler.h"
#include "gc_root-inl.h"
#include "handle_scope-inl.h"
#include "jni/jni_env_ext-inl.h"
#include "jvalue.h"
#include "jvmti.h"
#include "linear_alloc.h"
#include "mirror/array.h"
#include "mirror/class-inl.h"
#include "mirror/class_ext.h"
#include "mirror/class_loader-inl.h"
#include "mirror/string-inl.h"
#include "oat_file.h"
#include "scoped_thread_state_change-inl.h"
#include "stack.h"
#include "thread_list.h"
#include "ti_logging.h"
#include "ti_redefine.h"
namespace openjdkjvmti {
static EventHandler* gEventHandler = nullptr;
void Transformer::Register(EventHandler* eh) {
gEventHandler = eh;
}
// Initialize templates.
template
void Transformer::TransformSingleClassDirect<ArtJvmtiEvent::kClassFileLoadHookNonRetransformable>(
EventHandler* event_handler, art::Thread* self, /*in-out*/ArtClassDefinition* def);
template
void Transformer::TransformSingleClassDirect<ArtJvmtiEvent::kClassFileLoadHookRetransformable>(
EventHandler* event_handler, art::Thread* self, /*in-out*/ArtClassDefinition* def);
template
void Transformer::TransformSingleClassDirect<ArtJvmtiEvent::kStructuralDexFileLoadHook>(
EventHandler* event_handler, art::Thread* self, /*in-out*/ArtClassDefinition* def);
template<ArtJvmtiEvent kEvent>
void Transformer::TransformSingleClassDirect(EventHandler* event_handler,
art::Thread* self,
/*in-out*/ArtClassDefinition* def) {
static_assert(kEvent == ArtJvmtiEvent::kClassFileLoadHookNonRetransformable ||
kEvent == ArtJvmtiEvent::kClassFileLoadHookRetransformable ||
kEvent == ArtJvmtiEvent::kStructuralDexFileLoadHook,
"bad event type");
// We don't want to do transitions between calling the event and setting the new data so change to
// native state early.
art::ScopedThreadStateChange stsc(self, art::ThreadState::kNative);
jint new_len = -1;
unsigned char* new_data = nullptr;
art::ArrayRef<const unsigned char> dex_data = def->GetDexData();
event_handler->DispatchEvent<kEvent>(
self,
static_cast<JNIEnv*>(self->GetJniEnv()),
def->GetClass(),
def->GetLoader(),
def->GetName().c_str(),
def->GetProtectionDomain(),
static_cast<jint>(dex_data.size()),
dex_data.data(),
/*out*/&new_len,
/*out*/&new_data);
def->SetNewDexData(new_len, new_data, kEvent);
}
template <RedefinitionType kType>
void Transformer::RetransformClassesDirect(
art::Thread* self,
/*in-out*/ std::vector<ArtClassDefinition>* definitions) {
constexpr ArtJvmtiEvent kEvent = kType == RedefinitionType::kNormal
? ArtJvmtiEvent::kClassFileLoadHookRetransformable
: ArtJvmtiEvent::kStructuralDexFileLoadHook;
for (ArtClassDefinition& def : *definitions) {
TransformSingleClassDirect<kEvent>(gEventHandler, self, &def);
}
}
template void Transformer::RetransformClassesDirect<RedefinitionType::kNormal>(
art::Thread* self, /*in-out*/std::vector<ArtClassDefinition>* definitions);
template void Transformer::RetransformClassesDirect<RedefinitionType::kStructural>(
art::Thread* self, /*in-out*/std::vector<ArtClassDefinition>* definitions);
jvmtiError Transformer::RetransformClasses(jvmtiEnv* env,
jint class_count,
const jclass* classes) {
if (class_count < 0) {
JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM class_count was less then 0";
return ERR(ILLEGAL_ARGUMENT);
} else if (class_count == 0) {
// We don't actually need to do anything. Just return OK.
return OK;
} else if (classes == nullptr) {
JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM null classes!";
return ERR(NULL_POINTER);
}
art::Thread* self = art::Thread::Current();
art::Runtime* runtime = art::Runtime::Current();
// A holder that will Deallocate all the class bytes buffers on destruction.
std::string error_msg;
std::vector<ArtClassDefinition> definitions;
jvmtiError res = OK;
for (jint i = 0; i < class_count; i++) {
res = Redefiner::GetClassRedefinitionError<RedefinitionType::kNormal>(classes[i], &error_msg);
if (res != OK) {
JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM " << error_msg;
return res;
}
ArtClassDefinition def;
res = def.Init(self, classes[i]);
if (res != OK) {
JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM definition init failed";
return res;
}
definitions.push_back(std::move(def));
}
RetransformClassesDirect<RedefinitionType::kStructural>(self, &definitions);
RetransformClassesDirect<RedefinitionType::kNormal>(self, &definitions);
RedefinitionType redef_type =
std::any_of(definitions.cbegin(),
definitions.cend(),
[](const auto& it) { return it.HasStructuralChanges(); })
? RedefinitionType::kStructural
: RedefinitionType::kNormal;
res = Redefiner::RedefineClassesDirect(
ArtJvmTiEnv::AsArtJvmTiEnv(env), runtime, self, definitions, redef_type, &error_msg);
if (res != OK) {
JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM " << error_msg;
}
return res;
}
// TODO Move this somewhere else, ti_class?
jvmtiError GetClassLocation(ArtJvmTiEnv* env, jclass klass, /*out*/std::string* location) {
JNIEnv* jni_env = nullptr;
jint ret = env->art_vm->GetEnv(reinterpret_cast<void**>(&jni_env), JNI_VERSION_1_1);
if (ret != JNI_OK) {
// TODO Different error might be better?
return ERR(INTERNAL);
}
art::ScopedObjectAccess soa(jni_env);
art::StackHandleScope<1> hs(art::Thread::Current());
art::Handle<art::mirror::Class> hs_klass(hs.NewHandle(soa.Decode<art::mirror::Class>(klass)));
const art::DexFile& dex = hs_klass->GetDexFile();
*location = dex.GetLocation();
return OK;
}
} // namespace openjdkjvmti
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