//===-- GDBRemoteClientBaseTest.cpp -----------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#if defined(_MSC_VER) && (_HAS_EXCEPTIONS == 0)
// Workaround for MSVC standard library bug, which fails to include <thread>
// when
// exceptions are disabled.
#include <eh.h>
#endif
#include <future>

#include "GDBRemoteTestUtils.h"
#include "gtest/gtest.h"

#include "Plugins/Process/Utility/LinuxSignals.h"
#include "Plugins/Process/gdb-remote/GDBRemoteClientBase.h"
#include "Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h"

#include "llvm/ADT/STLExtras.h"

using namespace lldb_private::process_gdb_remote;
using namespace lldb_private;
using namespace lldb;
typedef GDBRemoteCommunication::PacketResult PacketResult;

namespace {

struct MockDelegate : public GDBRemoteClientBase::ContinueDelegate {
  std::string output;
  std::string misc_data;
  unsigned stop_reply_called = 0;

  void HandleAsyncStdout(llvm::StringRef out) { output += out; }
  void HandleAsyncMisc(llvm::StringRef data) { misc_data += data; }
  void HandleStopReply() { ++stop_reply_called; }

  bool HandleAsyncStructuredData(const StructuredData::ObjectSP &object_sp) {
    // TODO work in a test here after I fix the gtest breakage.
    return true;
  }
};

struct TestClient : public GDBRemoteClientBase {
  TestClient() : GDBRemoteClientBase("test.client", "test.client.listener") {
    m_send_acks = false;
  }
};

struct ContinueFixture {
  MockDelegate delegate;
  TestClient client;
  MockServer server;
  ListenerSP listener_sp;

  ContinueFixture();

  StateType SendCPacket(StringExtractorGDBRemote &response) {
    return client.SendContinuePacketAndWaitForResponse(delegate, LinuxSignals(),
                                                       "c", response);
  }

  void WaitForRunEvent() {
    EventSP event_sp;
    listener_sp->WaitForEventForBroadcasterWithType(
        std::chrono::microseconds(0), &client,
        TestClient::eBroadcastBitRunPacketSent, event_sp);
  }
};

ContinueFixture::ContinueFixture()
    : listener_sp(Listener::MakeListener("listener")) {
  Connect(client, server);
  listener_sp->StartListeningForEvents(&client,
                                       TestClient::eBroadcastBitRunPacketSent);
}

} // end anonymous namespace

class GDBRemoteClientBaseTest : public GDBRemoteTest {};

TEST_F(GDBRemoteClientBaseTest, SendContinueAndWait) {
  StringExtractorGDBRemote response;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Continue. The inferior will stop with a signal.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T01"));
  ASSERT_EQ(eStateStopped, fix.SendCPacket(response));
  ASSERT_EQ("T01", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());

  // Continue. The inferior will exit.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("W01"));
  ASSERT_EQ(eStateExited, fix.SendCPacket(response));
  ASSERT_EQ("W01", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());

  // Continue. The inferior will get killed.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("X01"));
  ASSERT_EQ(eStateExited, fix.SendCPacket(response));
  ASSERT_EQ("X01", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
}

TEST_F(GDBRemoteClientBaseTest, SendContinueAndAsyncSignal) {
  StringExtractorGDBRemote continue_response, response;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // SendAsyncSignal should do nothing when we are not running.
  ASSERT_FALSE(fix.client.SendAsyncSignal(0x47));

  // Continue. After the run packet is sent, send an async signal.
  std::future<StateType> continue_state = std::async(
      std::launch::async, [&] { return fix.SendCPacket(continue_response); });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  fix.WaitForRunEvent();

  std::future<bool> async_result = std::async(
      std::launch::async, [&] { return fix.client.SendAsyncSignal(0x47); });

  // First we'll get interrupted.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("\x03", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T13"));

  // Then we get the signal packet.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("C47", response.GetStringRef());
  ASSERT_TRUE(async_result.get());

  // And we report back a signal stop.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T47"));
  ASSERT_EQ(eStateStopped, continue_state.get());
  ASSERT_EQ("T47", continue_response.GetStringRef());
}

TEST_F(GDBRemoteClientBaseTest, SendContinueAndAsyncPacket) {
  StringExtractorGDBRemote continue_response, async_response, response;
  const bool send_async = true;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Continue. After the run packet is sent, send an async packet.
  std::future<StateType> continue_state = std::async(
      std::launch::async, [&] { return fix.SendCPacket(continue_response); });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  fix.WaitForRunEvent();

  // Sending without async enabled should fail.
  ASSERT_EQ(
      PacketResult::ErrorSendFailed,
      fix.client.SendPacketAndWaitForResponse("qTest1", response, !send_async));

  std::future<PacketResult> async_result = std::async(std::launch::async, [&] {
    return fix.client.SendPacketAndWaitForResponse("qTest2", async_response,
                                                   send_async);
  });

  // First we'll get interrupted.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("\x03", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T13"));

  // Then we get the async packet.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("qTest2", response.GetStringRef());

  // Send the response and receive it.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("QTest2"));
  ASSERT_EQ(PacketResult::Success, async_result.get());
  ASSERT_EQ("QTest2", async_response.GetStringRef());

  // And we get resumed again.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T01"));
  ASSERT_EQ(eStateStopped, continue_state.get());
  ASSERT_EQ("T01", continue_response.GetStringRef());
}

TEST_F(GDBRemoteClientBaseTest, SendContinueAndInterrupt) {
  StringExtractorGDBRemote continue_response, response;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Interrupt should do nothing when we're not running.
  ASSERT_FALSE(fix.client.Interrupt());

  // Continue. After the run packet is sent, send an interrupt.
  std::future<StateType> continue_state = std::async(
      std::launch::async, [&] { return fix.SendCPacket(continue_response); });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  fix.WaitForRunEvent();

  std::future<bool> async_result =
      std::async(std::launch::async, [&] { return fix.client.Interrupt(); });

  // We get interrupted.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("\x03", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T13"));

  // And that's it.
  ASSERT_EQ(eStateStopped, continue_state.get());
  ASSERT_EQ("T13", continue_response.GetStringRef());
  ASSERT_TRUE(async_result.get());
}

TEST_F(GDBRemoteClientBaseTest, SendContinueAndLateInterrupt) {
  StringExtractorGDBRemote continue_response, response;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Continue. After the run packet is sent, send an interrupt.
  std::future<StateType> continue_state = std::async(
      std::launch::async, [&] { return fix.SendCPacket(continue_response); });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  fix.WaitForRunEvent();

  std::future<bool> async_result =
      std::async(std::launch::async, [&] { return fix.client.Interrupt(); });

  // However, the target stops due to a different reason than the original
  // interrupt.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("\x03", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T01"));
  ASSERT_EQ(eStateStopped, continue_state.get());
  ASSERT_EQ("T01", continue_response.GetStringRef());
  ASSERT_TRUE(async_result.get());

  // The subsequent continue packet should work normally.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T01"));
  ASSERT_EQ(eStateStopped, fix.SendCPacket(response));
  ASSERT_EQ("T01", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
}

TEST_F(GDBRemoteClientBaseTest, SendContinueAndInterrupt2PacketBug) {
  StringExtractorGDBRemote continue_response, async_response, response;
  const bool send_async = true;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Interrupt should do nothing when we're not running.
  ASSERT_FALSE(fix.client.Interrupt());

  // Continue. After the run packet is sent, send an async signal.
  std::future<StateType> continue_state = std::async(
      std::launch::async, [&] { return fix.SendCPacket(continue_response); });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  fix.WaitForRunEvent();

  std::future<bool> interrupt_result =
      std::async(std::launch::async, [&] { return fix.client.Interrupt(); });

  // We get interrupted. We'll send two packets to simulate a buggy stub.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("\x03", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T13"));
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T13"));

  // We should stop.
  ASSERT_EQ(eStateStopped, continue_state.get());
  ASSERT_EQ("T13", continue_response.GetStringRef());
  ASSERT_TRUE(interrupt_result.get());

  // Packet stream should remain synchronized.
  std::future<PacketResult> send_result = std::async(std::launch::async, [&] {
    return fix.client.SendPacketAndWaitForResponse("qTest", async_response,
                                                   !send_async);
  });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("qTest", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("QTest"));
  ASSERT_EQ(PacketResult::Success, send_result.get());
  ASSERT_EQ("QTest", async_response.GetStringRef());
}

TEST_F(GDBRemoteClientBaseTest, SendContinueDelegateInterface) {
  StringExtractorGDBRemote response;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Continue. We'll have the server send a bunch of async packets before it
  // stops.
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("O4142"));
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("Apro"));
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("O4344"));
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("Afile"));
  ASSERT_EQ(PacketResult::Success, fix.server.SendPacket("T01"));
  ASSERT_EQ(eStateStopped, fix.SendCPacket(response));
  ASSERT_EQ("T01", response.GetStringRef());
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());

  EXPECT_EQ("ABCD", fix.delegate.output);
  EXPECT_EQ("profile", fix.delegate.misc_data);
  EXPECT_EQ(1u, fix.delegate.stop_reply_called);
}

TEST_F(GDBRemoteClientBaseTest, InterruptNoResponse) {
  StringExtractorGDBRemote continue_response, response;
  ContinueFixture fix;
  if (HasFailure())
    return;

  // Continue. After the run packet is sent, send an interrupt.
  std::future<StateType> continue_state = std::async(
      std::launch::async, [&] { return fix.SendCPacket(continue_response); });
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("c", response.GetStringRef());
  fix.WaitForRunEvent();

  std::future<bool> async_result =
      std::async(std::launch::async, [&] { return fix.client.Interrupt(); });

  // We get interrupted, but we don't send a stop packet.
  ASSERT_EQ(PacketResult::Success, fix.server.GetPacket(response));
  ASSERT_EQ("\x03", response.GetStringRef());

  // The functions should still terminate (after a timeout).
  ASSERT_TRUE(async_result.get());
  ASSERT_EQ(eStateInvalid, continue_state.get());
}