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#include <string>

#include <sstream>

#include <iostream>

#include <dlfcn.h>

#include "agent.h"

#include "cpu_profiler.h"

#include "lock_profiler.h"

#include <chrono>

#include <thread>

using namespace std;

Agent Agent::instance;

void Agent::LogMessage(string level, string msg) {

if (debug_mode) {

cout << "StackImpact Agent: " << level << ": " << msg << endl;

}

void Agent::LogInfo(string msg) {

LogMessage("INFO", msg);

}

void Agent::LogError(string msg) {

LogMessage("ERROR", msg);

}

bool Agent::CheckJVMTIError(jvmtiEnv *jvmti, jvmtiError error, string msg) {

if (error != JVMTI_ERROR_NONE) {

if (debug_mode) {

char *error_str;

error_str = NULL;

jvmti->GetErrorName(error, &error_str);

ostringstream error_message;

error_message << "JVMTI: "

<< (error_str == NULL ? "Unknown" : error_str)

<< " (" << error << "): "

<< msg;

LogError(error_message.str());

return false;

}

return true;

}

void Agent::Init(JavaVM* vm) {

Agent* agent = &Agent::instance;

jvm = vm;

int rc = jvm->GetEnv((void**)&agent->jni, JNI_VERSION_1_6);

if (rc != JNI_OK && rc != JNI_EDETACHED) {

agent->LogError("GetEnv, JNI_VERSION_1_6");

return;

}

rc = jvm->GetEnv((void **)&agent->jvmti, JVMTI_VERSION_1_2);

if (rc != JNI_OK) {

agent->LogError("GetEnv, JVMTI_VERSION_1_2");

return;

}

void LoadMethodIDs(jvmtiEnv* jvmti, jclass klass) {

jint num_methods;

jmethodID* methods;

if (jvmti->GetClassMethods(klass, &num_methods, &methods) == 0) {

jvmti->Deallocate((unsigned char*)methods);

}

void LoadAllMethodIDs(jvmtiEnv* jvmti) {

jint num_classes;

jclass* classes;

if (jvmti->GetLoadedClasses(&num_classes, &classes) == 0) {

for (int i = 0; i < num_classes; i++) {

LoadMethodIDs(jvmti, classes[i]);

}

jvmti->Deallocate((unsigned char*)classes);

}

void JNICALL ClassLoad(jvmtiEnv *jvmti_env, JNIEnv *jni_env, jthread thread,

jclass klass) {

}

void JNICALL ClassPrepare(jvmtiEnv *jvmti_env, JNIEnv* jni_env, jthread thread,

jclass klass) {

LoadMethodIDs(jvmti_env, klass);

}

void JNICALL CompiledMethodLoad(jvmtiEnv* jvmti, jmethodID method,

jint code_size, const void* code_addr,

jint map_length, const jvmtiAddrLocationMap* map,

const void* compile_info) {

}

bool Agent::Attach() {

if (is_attached) {

return true;

}

cpu_profiler = new CPUProfiler();

lock_profiler = new LockProfiler();

if (dlsym(RTLD_DEFAULT, "AsyncGetCallTrace") == NULL) {

LogError("AsyncGetCallTrace not available.");

return false;

}

jvmtiError error;

jvmtiCapabilities potentialCapabilities = {0};

jvmti->GetPotentialCapabilities(&potentialCapabilities);

jvmtiCapabilities capabilities = {0};

jvmtiEventCallbacks callbacks = {0};

callbacks.ClassLoad = ClassLoad;

callbacks.ClassPrepare = ClassPrepare;

if (potentialCapabilities.can_generate_compiled_method_load_events) {

capabilities.can_generate_compiled_method_load_events = 1;

callbacks.CompiledMethodLoad = CompiledMethodLoad;

}

else {

LogInfo("Missing capability: can_generate_compiled_method_load_events");

}

if (potentialCapabilities.can_get_source_file_name) {

capabilities.can_get_source_file_name = 1;

}

else {

LogInfo("Missing capability: can_get_source_file_name");

}

if (potentialCapabilities.can_get_line_numbers) {

capabilities.can_get_line_numbers = 1;

}

else {

LogInfo("Missing capability: can_get_line_numbers");

}

if (potentialCapabilities.can_generate_monitor_events) {

capabilities.can_generate_monitor_events = 1;

callbacks.MonitorContendedEnter = LockProfiler::MonitorContendedEnter;

callbacks.MonitorContendedEntered = LockProfiler::MonitorContendedEntered;

}

else {

LogInfo("Missing capability: can_generate_monitor_events");

}

if (potentialCapabilities.can_tag_objects) {

capabilities.can_tag_objects = 1;

}

else {

LogInfo("Missing capability: can_tag_objects");

}

error = jvmti->AddCapabilities(&capabilities);

CheckJVMTIError(jvmti, error, "AddCapabilities");

error = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));

CheckJVMTIError(jvmti, error, "SetEventCallbacks");

jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_LOAD, NULL);

jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, NULL);

jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);

//error = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_EXCEPTION, NULL);

CheckJVMTIError(jvmti, error, "SetEventNotificationMode");

// Initialize methodIDs by calling GetClassMethods, needed for AsyncGetCallTrace to function.

LoadAllMethodIDs(jvmti);

jvmti->GenerateEvents(JVMTI_EVENT_DYNAMIC_CODE_GENERATED);

jvmti->GenerateEvents(JVMTI_EVENT_COMPILED_METHOD_LOAD);

is_attached = true;

LogInfo("The JVMTI agent has been attached successfuly.");

return true;

}

extern "C" JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {

// the agent is not loaded via agentpath, it's loaded from java agent

return JNI_ERR;

}

extern "C" JNIEXPORT jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {

return JNI_ERR;

}

extern "C" JNIEXPORT void JNICALL Agent_OnUnload(JavaVM *vm) {

Agent::instance.LogInfo("Agent_OnUnload");

}

extern "C" JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* jvm, void* reserved) {

Agent* agent = &Agent::instance;

agent->Init(jvm);

return JNI_VERSION_1_6;

}

extern "C" JNIEXPORT jboolean JNICALL Java_com_stackimpact_agent_Agent_attach(JNIEnv* env, jobject unused, jboolean debug_mode) {

Agent* agent = &Agent::instance;

agent->jni = env;

agent->debug_mode = (bool)debug_mode;

return agent->Attach();

}