/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <limits>
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#include <memory>
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#include "jni.h"
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#include "jvmti.h"
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// Test infrastructure
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#include "jvmti_helper.h"
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#include "test_env.h"
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// Slicer's headers have code that triggers these warnings. b/65298177
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wsign-compare"
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#pragma clang diagnostic ignored "-Wunused-parameter"
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#include "slicer/instrumentation.h"
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#include "slicer/reader.h"
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#include "slicer/writer.h"
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#pragma clang diagnostic pop
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namespace art {
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namespace Test980RedefineObject {
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static void JNICALL RedefineObjectHook(jvmtiEnv *jvmti_env,
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JNIEnv* env,
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jclass class_being_redefined ATTRIBUTE_UNUSED,
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jobject loader ATTRIBUTE_UNUSED,
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const char* name,
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jobject protection_domain ATTRIBUTE_UNUSED,
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jint class_data_len,
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const unsigned char* class_data,
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jint* new_class_data_len,
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unsigned char** new_class_data) {
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if (strcmp(name, "java/lang/Object") != 0) {
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return;
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}
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dex::Reader reader(class_data, class_data_len);
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dex::u4 class_index = reader.FindClassIndex("Ljava/lang/Object;");
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if (class_index == dex::kNoIndex) {
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env->ThrowNew(env->FindClass("java/lang/RuntimeException"),
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"Failed to find object in dex file!");
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return;
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}
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reader.CreateClassIr(class_index);
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auto dex_ir = reader.GetIr();
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slicer::MethodInstrumenter mi(dex_ir);
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mi.AddTransformation<slicer::EntryHook>(ir::MethodId("Lart/test/TestWatcher;",
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"NotifyConstructed"),
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/*this_as_object*/ true);
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if (!mi.InstrumentMethod(ir::MethodId("Ljava/lang/Object;",
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"<init>",
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"()V"))) {
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env->ThrowNew(env->FindClass("java/lang/RuntimeException"),
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"Failed to find Object;-><init>()V in dex file!");
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return;
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}
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dex::Writer writer(dex_ir);
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class JvmtiAllocator : public dex::Writer::Allocator {
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public:
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explicit JvmtiAllocator(jvmtiEnv* jvmti) : jvmti_(jvmti) {}
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void* Allocate(size_t size) override {
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unsigned char* res = nullptr;
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jvmti_->Allocate(size, &res);
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return res;
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}
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void Free(void* ptr) override {
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jvmti_->Deallocate(reinterpret_cast<unsigned char*>(ptr));
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}
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private:
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jvmtiEnv* jvmti_;
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};
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JvmtiAllocator allocator(jvmti_env);
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size_t new_size;
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*new_class_data = writer.CreateImage(&allocator, &new_size);
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if (new_size > std::numeric_limits<jint>::max()) {
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*new_class_data = nullptr;
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env->ThrowNew(env->FindClass("java/lang/RuntimeException"),
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"transform result is too large!");
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return;
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}
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*new_class_data_len = static_cast<jint>(new_size);
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}
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extern "C" JNIEXPORT void JNICALL Java_Main_addMemoryTrackingCall(JNIEnv* env,
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jclass klass ATTRIBUTE_UNUSED,
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jclass obj_class,
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jthread thr) {
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jvmtiCapabilities caps {.can_retransform_classes = 1};
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if (JvmtiErrorToException(env, jvmti_env, jvmti_env->AddCapabilities(&caps))) {
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return;
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}
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jvmtiEventCallbacks cb {.ClassFileLoadHook = RedefineObjectHook };
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if (JvmtiErrorToException(env, jvmti_env, jvmti_env->SetEventCallbacks(&cb, sizeof(cb)))) {
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return;
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}
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if (JvmtiErrorToException(env,
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jvmti_env,
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jvmti_env->SetEventNotificationMode(JVMTI_ENABLE,
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JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
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thr))) {
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return;
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}
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if (JvmtiErrorToException(env,
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jvmti_env,
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jvmti_env->RetransformClasses(1, &obj_class))) {
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return;
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}
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if (JvmtiErrorToException(env,
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jvmti_env,
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jvmti_env->SetEventNotificationMode(JVMTI_DISABLE,
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JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
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thr))) {
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return;
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}
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}
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} // namespace Test980RedefineObject
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} // namespace art
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