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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <limits>
#include <memory>
#include "jni.h"
#include "jvmti.h"
// Test infrastructure
#include "jvmti_helper.h"
#include "test_env.h"
// Slicer's headers have code that triggers these warnings. b/65298177
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wsign-compare"
#pragma clang diagnostic ignored "-Wunused-parameter"
#include "slicer/instrumentation.h"
#include "slicer/reader.h"
#include "slicer/writer.h"
#pragma clang diagnostic pop
namespace art {
namespace Test1959RedefineObjectInstrument {
// Just pull it out of the dex file but don't bother changing anything.
static void JNICALL RedefineObjectHook(jvmtiEnv *jvmti_env,
JNIEnv* env,
jclass class_being_redefined ATTRIBUTE_UNUSED,
jobject loader ATTRIBUTE_UNUSED,
const char* name,
jobject protection_domain ATTRIBUTE_UNUSED,
jint class_data_len,
const unsigned char* class_data,
jint* new_class_data_len,
unsigned char** new_class_data) {
if (strcmp(name, "java/lang/Object") != 0) {
return;
}
dex::Reader reader(class_data, class_data_len);
dex::u4 class_index = reader.FindClassIndex("Ljava/lang/Object;");
if (class_index == dex::kNoIndex) {
env->ThrowNew(env->FindClass("java/lang/RuntimeException"),
"Failed to find object in dex file!");
return;
}
reader.CreateClassIr(class_index);
auto dex_ir = reader.GetIr();
dex::Writer writer(dex_ir);
class JvmtiAllocator : public dex::Writer::Allocator {
public:
explicit JvmtiAllocator(jvmtiEnv* jvmti) : jvmti_(jvmti) {}
void* Allocate(size_t size) override {
unsigned char* res = nullptr;
jvmti_->Allocate(size, &res);
return res;
}
void Free(void* ptr) override {
jvmti_->Deallocate(reinterpret_cast<unsigned char*>(ptr));
}
private:
jvmtiEnv* jvmti_;
};
JvmtiAllocator allocator(jvmti_env);
size_t new_size;
*new_class_data = writer.CreateImage(&allocator, &new_size);
if (new_size > std::numeric_limits<jint>::max()) {
*new_class_data = nullptr;
env->ThrowNew(env->FindClass("java/lang/RuntimeException"),
"transform result is too large!");
return;
}
*new_class_data_len = static_cast<jint>(new_size);
}
extern "C" JNIEXPORT void JNICALL Java_Main_forceRedefine(JNIEnv* env,
jclass klass ATTRIBUTE_UNUSED,
jclass obj_class,
jthread thr) {
if (IsJVM()) {
// RI so don't do anything.
return;
}
jvmtiCapabilities caps {.can_retransform_classes = 1};
if (JvmtiErrorToException(env, jvmti_env, jvmti_env->AddCapabilities(&caps))) {
return;
}
jvmtiEventCallbacks cb {.ClassFileLoadHook = RedefineObjectHook };
if (JvmtiErrorToException(env, jvmti_env, jvmti_env->SetEventCallbacks(&cb, sizeof(cb)))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventNotificationMode(JVMTI_ENABLE,
JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
thr))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->RetransformClasses(1, &obj_class))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventNotificationMode(JVMTI_DISABLE,
JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
thr))) {
return;
}
}
} // namespace Test1959RedefineObjectInstrument
} // namespace art
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