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//===-- GDBRemoteCommunicationReplayServer.cpp ------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <errno.h>
#include "lldb/Host/Config.h"
#include "GDBRemoteCommunicationReplayServer.h"
#include "ProcessGDBRemoteLog.h"
// C Includes
// C++ Includes
#include <cstring>
// Project includes
#include "lldb/Host/ThreadLauncher.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/Utility/Event.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/StringExtractorGDBRemote.h"
using namespace llvm;
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_gdb_remote;
GDBRemoteCommunicationReplayServer::GDBRemoteCommunicationReplayServer()
: GDBRemoteCommunication("gdb-remote.server",
"gdb-remote.server.rx_packet"),
m_async_broadcaster(nullptr, "lldb.gdb-remote.server.async-broadcaster"),
m_async_listener_sp(
Listener::MakeListener("lldb.gdb-remote.server.async-listener")),
m_async_thread_state_mutex(), m_skip_acks(false) {
m_async_broadcaster.SetEventName(eBroadcastBitAsyncContinue,
"async thread continue");
m_async_broadcaster.SetEventName(eBroadcastBitAsyncThreadShouldExit,
"async thread should exit");
const uint32_t async_event_mask =
eBroadcastBitAsyncContinue | eBroadcastBitAsyncThreadShouldExit;
m_async_listener_sp->StartListeningForEvents(&m_async_broadcaster,
async_event_mask);
}
GDBRemoteCommunicationReplayServer::~GDBRemoteCommunicationReplayServer() {
StopAsyncThread();
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationReplayServer::GetPacketAndSendResponse(
Timeout<std::micro> timeout, Status &error, bool &interrupt, bool &quit) {
StringExtractorGDBRemote packet;
PacketResult packet_result = WaitForPacketNoLock(packet, timeout, false);
if (packet_result != PacketResult::Success) {
if (!IsConnected()) {
error.SetErrorString("lost connection");
quit = true;
} else {
error.SetErrorString("timeout");
}
return packet_result;
}
m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncContinue);
if (m_skip_acks) {
const StringExtractorGDBRemote::ServerPacketType packet_type =
packet.GetServerPacketType();
switch (packet_type) {
case StringExtractorGDBRemote::eServerPacketType_nack:
case StringExtractorGDBRemote::eServerPacketType_ack:
return PacketResult::Success;
default:
break;
}
} else if (packet.GetStringRef() == "QStartNoAckMode") {
m_skip_acks = true;
m_send_acks = false;
}
while (!m_packet_history.empty()) {
// Pop last packet from the history.
GDBRemoteCommunicationHistory::Entry entry = m_packet_history.back();
m_packet_history.pop_back();
// We only care about what we received from the server. Skip everything
// the client sent.
if (entry.type != GDBRemoteCommunicationHistory::ePacketTypeRecv)
continue;
return SendRawPacketNoLock(entry.packet.data, true);
}
quit = true;
return packet_result;
}
LLVM_YAML_IS_DOCUMENT_LIST_VECTOR(
std::vector<
lldb_private::process_gdb_remote::GDBRemoteCommunicationHistory::Entry>)
llvm::Error
GDBRemoteCommunicationReplayServer::LoadReplayHistory(const FileSpec &path) {
auto error_or_file = MemoryBuffer::getFile(path.GetPath());
if (auto err = error_or_file.getError())
return errorCodeToError(err);
yaml::Input yin((*error_or_file)->getBuffer());
yin >> m_packet_history;
if (auto err = yin.error())
return errorCodeToError(err);
// We want to manipulate the vector like a stack so we need to reverse the
// order of the packets to have the oldest on at the back.
std::reverse(m_packet_history.begin(), m_packet_history.end());
return Error::success();
}
bool GDBRemoteCommunicationReplayServer::StartAsyncThread() {
std::lock_guard<std::recursive_mutex> guard(m_async_thread_state_mutex);
if (!m_async_thread.IsJoinable()) {
// Create a thread that watches our internal state and controls which
// events make it to clients (into the DCProcess event queue).
m_async_thread = ThreadLauncher::LaunchThread(
"<lldb.gdb-remote.server.async>",
GDBRemoteCommunicationReplayServer::AsyncThread, this, nullptr);
}
// Wait for handshake.
m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncContinue);
return m_async_thread.IsJoinable();
}
void GDBRemoteCommunicationReplayServer::StopAsyncThread() {
std::lock_guard<std::recursive_mutex> guard(m_async_thread_state_mutex);
if (!m_async_thread.IsJoinable())
return;
// Request thread to stop.
m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncThreadShouldExit);
// Disconnect client.
Disconnect();
// Stop the thread.
m_async_thread.Join(nullptr);
m_async_thread.Reset();
}
void GDBRemoteCommunicationReplayServer::ReceivePacket(
GDBRemoteCommunicationReplayServer &server, bool &done) {
Status error;
bool interrupt;
auto packet_result = server.GetPacketAndSendResponse(std::chrono::seconds(1),
error, interrupt, done);
if (packet_result != GDBRemoteCommunication::PacketResult::Success &&
packet_result !=
GDBRemoteCommunication::PacketResult::ErrorReplyTimeout) {
done = true;
} else {
server.m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncContinue);
}
}
thread_result_t GDBRemoteCommunicationReplayServer::AsyncThread(void *arg) {
GDBRemoteCommunicationReplayServer *server =
(GDBRemoteCommunicationReplayServer *)arg;
EventSP event_sp;
bool done = false;
while (true) {
if (server->m_async_listener_sp->GetEvent(event_sp, llvm::None)) {
const uint32_t event_type = event_sp->GetType();
if (event_sp->BroadcasterIs(&server->m_async_broadcaster)) {
switch (event_type) {
case eBroadcastBitAsyncContinue:
ReceivePacket(*server, done);
if (done)
return {};
break;
case eBroadcastBitAsyncThreadShouldExit:
default:
return {};
}
}
}
}
return {};
}
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