blob: 1d7f137f2b4363ff6ebfaa28a16c5aded40aa31e [file] [log] [blame]
/* 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 <unordered_map>
#include <unordered_set>
#include "transform.h"
#include "art_method.h"
#include "base/array_ref.h"
#include "class_linker.h"
#include "dex_file.h"
#include "dex_file_types.h"
#include "events-inl.h"
#include "gc_root-inl.h"
#include "globals.h"
#include "jni_env_ext-inl.h"
#include "jvalue.h"
#include "jvmti.h"
#include "linear_alloc.h"
#include "mem_map.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_redefine.h"
#include "transform.h"
#include "utf.h"
#include "utils/dex_cache_arrays_layout-inl.h"
namespace openjdkjvmti {
jvmtiError Transformer::RetransformClassesDirect(
ArtJvmTiEnv* env,
EventHandler* event_handler,
art::Thread* self,
/*in-out*/std::vector<ArtClassDefinition>* definitions) {
for (ArtClassDefinition& def : *definitions) {
jint new_len = -1;
unsigned char* new_data = nullptr;
art::ArrayRef<const unsigned char> dex_data = def.GetDexData();
event_handler->DispatchEvent<ArtJvmtiEvent::kClassFileLoadHookRetransformable>(
self,
GetJniEnv(env),
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(env, new_len, new_data);
}
return OK;
}
jvmtiError Transformer::RetransformClasses(ArtJvmTiEnv* env,
EventHandler* event_handler,
art::Runtime* runtime,
art::Thread* self,
jint class_count,
const jclass* classes,
/*out*/std::string* error_msg) {
if (env == nullptr) {
*error_msg = "env was null!";
return ERR(INVALID_ENVIRONMENT);
} else if (class_count < 0) {
*error_msg = "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) {
*error_msg = "null classes!";
return ERR(NULL_POINTER);
}
// A holder that will Deallocate all the class bytes buffers on destruction.
std::vector<ArtClassDefinition> definitions;
jvmtiError res = OK;
for (jint i = 0; i < class_count; i++) {
jboolean is_modifiable = JNI_FALSE;
res = env->IsModifiableClass(classes[i], &is_modifiable);
if (res != OK) {
return res;
} else if (!is_modifiable) {
return ERR(UNMODIFIABLE_CLASS);
}
ArtClassDefinition def;
res = def.Init(env, classes[i]);
if (res != OK) {
return res;
}
definitions.push_back(std::move(def));
}
res = RetransformClassesDirect(env, event_handler, self, &definitions);
if (res != OK) {
return res;
}
return Redefiner::RedefineClassesDirect(env, runtime, self, definitions, error_msg);
}
// 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