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//===-- GDBRemoteCommunicationServer.cpp ----------------------------------===//
//
// 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 <cerrno>
#include "lldb/Host/Config.h"
#include "GDBRemoteCommunicationServer.h"
#include "ProcessGDBRemoteLog.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/StringExtractorGDBRemote.h"
#include "lldb/Utility/UnimplementedError.h"
#include "llvm/Support/JSON.h"
#include <cstring>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_gdb_remote;
using namespace llvm;
GDBRemoteCommunicationServer::GDBRemoteCommunicationServer()
: GDBRemoteCommunication(), m_exit_now(false) {
RegisterPacketHandler(
StringExtractorGDBRemote::eServerPacketType_QEnableErrorStrings,
[this](StringExtractorGDBRemote packet, Status &error, bool &interrupt,
bool &quit) { return this->Handle_QErrorStringEnable(packet); });
}
GDBRemoteCommunicationServer::~GDBRemoteCommunicationServer() = default;
void GDBRemoteCommunicationServer::RegisterPacketHandler(
StringExtractorGDBRemote::ServerPacketType packet_type,
PacketHandler handler) {
m_packet_handlers[packet_type] = std::move(handler);
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::GetPacketAndSendResponse(
Timeout<std::micro> timeout, Status &error, bool &interrupt, bool &quit) {
StringExtractorGDBRemote packet;
PacketResult packet_result = ReadPacket(packet, timeout, false);
if (packet_result == PacketResult::Success) {
const StringExtractorGDBRemote::ServerPacketType packet_type =
packet.GetServerPacketType();
switch (packet_type) {
case StringExtractorGDBRemote::eServerPacketType_nack:
case StringExtractorGDBRemote::eServerPacketType_ack:
break;
case StringExtractorGDBRemote::eServerPacketType_invalid:
error.SetErrorString("invalid packet");
quit = true;
break;
case StringExtractorGDBRemote::eServerPacketType_unimplemented:
packet_result = SendUnimplementedResponse(packet.GetStringRef().data());
break;
default:
auto handler_it = m_packet_handlers.find(packet_type);
if (handler_it == m_packet_handlers.end())
packet_result = SendUnimplementedResponse(packet.GetStringRef().data());
else
packet_result = handler_it->second(packet, error, interrupt, quit);
break;
}
} else {
if (!IsConnected()) {
error.SetErrorString("lost connection");
quit = true;
} else {
error.SetErrorString("timeout");
}
}
// Check if anything occurred that would force us to want to exit.
if (m_exit_now)
quit = true;
return packet_result;
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendUnimplementedResponse(const char *) {
// TODO: Log the packet we aren't handling...
return SendPacketNoLock("");
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendErrorResponse(uint8_t err) {
char packet[16];
int packet_len = ::snprintf(packet, sizeof(packet), "E%2.2x", err);
assert(packet_len < (int)sizeof(packet));
return SendPacketNoLock(llvm::StringRef(packet, packet_len));
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendErrorResponse(const Status &error) {
if (m_send_error_strings) {
lldb_private::StreamString packet;
packet.Printf("E%2.2x;", static_cast<uint8_t>(error.GetError()));
packet.PutStringAsRawHex8(error.AsCString());
return SendPacketNoLock(packet.GetString());
} else
return SendErrorResponse(error.GetError());
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendErrorResponse(llvm::Error error) {
assert(error);
std::unique_ptr<llvm::ErrorInfoBase> EIB;
std::unique_ptr<UnimplementedError> UE;
llvm::handleAllErrors(
std::move(error),
[&](std::unique_ptr<UnimplementedError> E) { UE = std::move(E); },
[&](std::unique_ptr<llvm::ErrorInfoBase> E) { EIB = std::move(E); });
if (EIB)
return SendErrorResponse(Status(llvm::Error(std::move(EIB))));
return SendUnimplementedResponse("");
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::Handle_QErrorStringEnable(
StringExtractorGDBRemote &packet) {
m_send_error_strings = true;
return SendOKResponse();
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendIllFormedResponse(
const StringExtractorGDBRemote &failed_packet, const char *message) {
Log *log = GetLog(GDBRLog::Packets);
LLDB_LOGF(log, "GDBRemoteCommunicationServer::%s: ILLFORMED: '%s' (%s)",
__FUNCTION__, failed_packet.GetStringRef().data(),
message ? message : "");
return SendErrorResponse(0x03);
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendOKResponse() {
return SendPacketNoLock("OK");
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendJSONResponse(const json::Value &value) {
std::string json_string;
raw_string_ostream os(json_string);
os << value;
os.flush();
StreamGDBRemote escaped_response;
escaped_response.PutEscapedBytes(json_string.c_str(), json_string.size());
return SendPacketNoLock(escaped_response.GetString());
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::SendJSONResponse(Expected<json::Value> value) {
if (!value)
return SendErrorResponse(value.takeError());
return SendJSONResponse(*value);
}
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