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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 <unordered_map>
#include <unordered_set>
#include "transform.h"
#include "art_method.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 "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,
art::Thread* self,
/*in-out*/std::vector<ArtClassDefinition>* definitions) {
for (ArtClassDefinition& def : *definitions) {
jint new_len = -1;
unsigned char* new_data = nullptr;
// Static casts are so that we get the right template initialization for the special event
// handling code required by the ClassFileLoadHooks.
gEventHandler.DispatchEvent(self,
ArtJvmtiEvent::kClassFileLoadHookRetransformable,
GetJniEnv(env),
static_cast<jclass>(def.klass),
static_cast<jobject>(def.loader),
static_cast<const char*>(def.name.c_str()),
static_cast<jobject>(def.protection_domain),
static_cast<jint>(def.dex_len),
static_cast<const unsigned char*>(def.dex_data.get()),
static_cast<jint*>(&new_len),
static_cast<unsigned char**>(&new_data));
def.SetNewDexData(env, new_len, new_data);
}
return OK;
}
jvmtiError Transformer::RetransformClasses(ArtJvmTiEnv* env,
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++) {
ArtClassDefinition def;
res = FillInTransformationData(env, classes[i], &def);
if (res != OK) {
return res;
}
definitions.push_back(std::move(def));
}
res = RetransformClassesDirect(env, 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;
}
static jvmtiError CopyDataIntoJvmtiBuffer(ArtJvmTiEnv* env,
const unsigned char* source,
jint len,
/*out*/unsigned char** dest) {
jvmtiError res = env->Allocate(len, dest);
if (res != OK) {
return res;
}
memcpy(reinterpret_cast<void*>(*dest),
reinterpret_cast<const void*>(source),
len);
return OK;
}
jvmtiError Transformer::GetDexDataForRetransformation(ArtJvmTiEnv* env,
art::Handle<art::mirror::Class> klass,
/*out*/jint* dex_data_len,
/*out*/unsigned char** dex_data) {
art::StackHandleScope<2> hs(art::Thread::Current());
art::Handle<art::mirror::ClassExt> ext(hs.NewHandle(klass->GetExtData()));
if (!ext.IsNull()) {
art::Handle<art::mirror::ByteArray> orig_dex(hs.NewHandle(ext->GetOriginalDexFileBytes()));
if (!orig_dex.IsNull()) {
*dex_data_len = static_cast<jint>(orig_dex->GetLength());
return CopyDataIntoJvmtiBuffer(env,
reinterpret_cast<const unsigned char*>(orig_dex->GetData()),
*dex_data_len,
/*out*/dex_data);
}
}
// TODO De-quicken the dex file before passing it to the agents.
LOG(WARNING) << "Dex file is not de-quickened yet! Quickened dex instructions might be present";
const art::DexFile& dex = klass->GetDexFile();
*dex_data_len = static_cast<jint>(dex.Size());
return CopyDataIntoJvmtiBuffer(env, dex.Begin(), *dex_data_len, /*out*/dex_data);
}
// TODO Move this function somewhere more appropriate.
// Gets the data surrounding the given class.
// TODO Make this less magical.
jvmtiError Transformer::FillInTransformationData(ArtJvmTiEnv* env,
jclass klass,
ArtClassDefinition* def) {
JNIEnv* jni_env = GetJniEnv(env);
if (jni_env == nullptr) {
// TODO Different error might be better?
return ERR(INTERNAL);
}
art::ScopedObjectAccess soa(jni_env);
art::StackHandleScope<3> hs(art::Thread::Current());
art::Handle<art::mirror::Class> hs_klass(hs.NewHandle(soa.Decode<art::mirror::Class>(klass)));
if (hs_klass.IsNull()) {
return ERR(INVALID_CLASS);
}
def->klass = klass;
def->loader = soa.AddLocalReference<jobject>(hs_klass->GetClassLoader());
def->name = art::mirror::Class::ComputeName(hs_klass)->ToModifiedUtf8();
// TODO is this always null?
def->protection_domain = nullptr;
if (def->dex_data.get() == nullptr) {
unsigned char* new_data;
jvmtiError res = GetDexDataForRetransformation(env, hs_klass, &def->dex_len, &new_data);
if (res == OK) {
def->dex_data = MakeJvmtiUniquePtr(env, new_data);
} else {
return res;
}
}
return OK;
}
} // namespace openjdkjvmti
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