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dda73336ad22bd0b5ecda17040c50fb10fcbe5fb
clang-p2996/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp
Alex Langford 2f377c5bd7 [lldb][NFCI] Remove use of ConstString from UnixSignals 
The majority of UnixSignals strings are static in the sense that they do
not change. The overwhelming majority of these strings are string
literals. Using ConstString to manage their lifetime does not make
sense. The only exception to this is one of the subclasses of
UnixSignals, for which I have created a StringSet local to that file
which will guarantee the lifetimes of these StringRefs.

As for the other benefits of ConstString, string uniqueness is not a
concern (as many of them are already string literals) and comparing
signal names and aliases should not be a hot path.

Differential Revision: https://reviews.llvm.org/D159011
2023-09-14 10:19:53 -07:00

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//===-- PlatformRemoteGDBServer.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 "PlatformRemoteGDBServer.h"
#include "lldb/Host/Config.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Host/ConnectionFileDescriptor.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/PosixApi.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/ProcessInfo.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/UriParser.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/FormatAdapters.h"
#include "Plugins/Process/Utility/GDBRemoteSignals.h"
#include "Plugins/Process/gdb-remote/ProcessGDBRemote.h"
#include <mutex>
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::platform_gdb_server;
LLDB_PLUGIN_DEFINE_ADV(PlatformRemoteGDBServer, PlatformGDB)
static bool g_initialized = false;
// UnixSignals does not store the signal names or descriptions itself.
// It holds onto StringRefs. Becaue we may get signal information dynamically
// from the remote, these strings need persistent storage client-side.
static std::mutex g_signal_string_mutex;
static llvm::StringSet<> g_signal_string_storage;
void PlatformRemoteGDBServer::Initialize() {
Platform::Initialize();
if (!g_initialized) {
g_initialized = true;
PluginManager::RegisterPlugin(
PlatformRemoteGDBServer::GetPluginNameStatic(),
PlatformRemoteGDBServer::GetDescriptionStatic(),
PlatformRemoteGDBServer::CreateInstance);
}
}
void PlatformRemoteGDBServer::Terminate() {
if (g_initialized) {
g_initialized = false;
PluginManager::UnregisterPlugin(PlatformRemoteGDBServer::CreateInstance);
}
Platform::Terminate();
}
PlatformSP PlatformRemoteGDBServer::CreateInstance(bool force,
const ArchSpec *arch) {
bool create = force;
if (!create) {
create = !arch->TripleVendorWasSpecified() && !arch->TripleOSWasSpecified();
}
if (create)
return PlatformSP(new PlatformRemoteGDBServer());
return PlatformSP();
}
llvm::StringRef PlatformRemoteGDBServer::GetDescriptionStatic() {
return "A platform that uses the GDB remote protocol as the communication "
"transport.";
}
llvm::StringRef PlatformRemoteGDBServer::GetDescription() {
if (m_platform_description.empty()) {
if (IsConnected()) {
// Send the get description packet
}
}
if (!m_platform_description.empty())
return m_platform_description.c_str();
return GetDescriptionStatic();
}
bool PlatformRemoteGDBServer::GetModuleSpec(const FileSpec &module_file_spec,
const ArchSpec &arch,
ModuleSpec &module_spec) {
Log *log = GetLog(LLDBLog::Platform);
const auto module_path = module_file_spec.GetPath(false);
if (!m_gdb_client_up ||
!m_gdb_client_up->GetModuleInfo(module_file_spec, arch, module_spec)) {
LLDB_LOGF(
log,
"PlatformRemoteGDBServer::%s - failed to get module info for %s:%s",
__FUNCTION__, module_path.c_str(),
arch.GetTriple().getTriple().c_str());
return false;
}
if (log) {
StreamString stream;
module_spec.Dump(stream);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::%s - got module info for (%s:%s) : %s",
__FUNCTION__, module_path.c_str(),
arch.GetTriple().getTriple().c_str(), stream.GetData());
}
return true;
}
Status PlatformRemoteGDBServer::GetFileWithUUID(const FileSpec &platform_file,
const UUID *uuid_ptr,
FileSpec &local_file) {
// Default to the local case
local_file = platform_file;
return Status();
}
/// Default Constructor
PlatformRemoteGDBServer::PlatformRemoteGDBServer()
: Platform(/*is_host=*/false) {}
/// Destructor.
///
/// The destructor is virtual since this class is designed to be
/// inherited from by the plug-in instance.
PlatformRemoteGDBServer::~PlatformRemoteGDBServer() = default;
size_t PlatformRemoteGDBServer::GetSoftwareBreakpointTrapOpcode(
Target &target, BreakpointSite *bp_site) {
// This isn't needed if the z/Z packets are supported in the GDB remote
// server. But we might need a packet to detect this.
return 0;
}
bool PlatformRemoteGDBServer::GetRemoteOSVersion() {
if (m_gdb_client_up)
m_os_version = m_gdb_client_up->GetOSVersion();
return !m_os_version.empty();
}
std::optional<std::string> PlatformRemoteGDBServer::GetRemoteOSBuildString() {
if (!m_gdb_client_up)
return std::nullopt;
return m_gdb_client_up->GetOSBuildString();
}
std::optional<std::string>
PlatformRemoteGDBServer::GetRemoteOSKernelDescription() {
if (!m_gdb_client_up)
return std::nullopt;
return m_gdb_client_up->GetOSKernelDescription();
}
// Remote Platform subclasses need to override this function
ArchSpec PlatformRemoteGDBServer::GetRemoteSystemArchitecture() {
if (!m_gdb_client_up)
return ArchSpec();
return m_gdb_client_up->GetSystemArchitecture();
}
FileSpec PlatformRemoteGDBServer::GetRemoteWorkingDirectory() {
if (IsConnected()) {
Log *log = GetLog(LLDBLog::Platform);
FileSpec working_dir;
if (m_gdb_client_up->GetWorkingDir(working_dir) && log)
LLDB_LOGF(log,
"PlatformRemoteGDBServer::GetRemoteWorkingDirectory() -> '%s'",
working_dir.GetPath().c_str());
return working_dir;
} else {
return Platform::GetRemoteWorkingDirectory();
}
}
bool PlatformRemoteGDBServer::SetRemoteWorkingDirectory(
const FileSpec &working_dir) {
if (IsConnected()) {
// Clear the working directory it case it doesn't get set correctly. This
// will for use to re-read it
Log *log = GetLog(LLDBLog::Platform);
LLDB_LOGF(log, "PlatformRemoteGDBServer::SetRemoteWorkingDirectory('%s')",
working_dir.GetPath().c_str());
return m_gdb_client_up->SetWorkingDir(working_dir) == 0;
} else
return Platform::SetRemoteWorkingDirectory(working_dir);
}
bool PlatformRemoteGDBServer::IsConnected() const {
if (m_gdb_client_up) {
assert(m_gdb_client_up->IsConnected());
return true;
}
return false;
}
Status PlatformRemoteGDBServer::ConnectRemote(Args &args) {
Status error;
if (IsConnected()) {
error.SetErrorStringWithFormat("the platform is already connected to '%s', "
"execute 'platform disconnect' to close the "
"current connection",
GetHostname());
return error;
}
if (args.GetArgumentCount() != 1) {
error.SetErrorString(
"\"platform connect\" takes a single argument: <connect-url>");
return error;
}
const char *url = args.GetArgumentAtIndex(0);
if (!url)
return Status("URL is null.");
std::optional<URI> parsed_url = URI::Parse(url);
if (!parsed_url)
return Status("Invalid URL: %s", url);
// We're going to reuse the hostname when we connect to the debugserver.
m_platform_scheme = parsed_url->scheme.str();
m_platform_hostname = parsed_url->hostname.str();
auto client_up =
std::make_unique<process_gdb_remote::GDBRemoteCommunicationClient>();
client_up->SetPacketTimeout(
process_gdb_remote::ProcessGDBRemote::GetPacketTimeout());
client_up->SetConnection(std::make_unique<ConnectionFileDescriptor>());
client_up->Connect(url, &error);
if (error.Fail())
return error;
if (client_up->HandshakeWithServer(&error)) {
m_gdb_client_up = std::move(client_up);
m_gdb_client_up->GetHostInfo();
// If a working directory was set prior to connecting, send it down
// now.
if (m_working_dir)
m_gdb_client_up->SetWorkingDir(m_working_dir);
m_supported_architectures.clear();
ArchSpec remote_arch = m_gdb_client_up->GetSystemArchitecture();
if (remote_arch) {
m_supported_architectures.push_back(remote_arch);
if (remote_arch.GetTriple().isArch64Bit())
m_supported_architectures.push_back(
ArchSpec(remote_arch.GetTriple().get32BitArchVariant()));
}
} else {
client_up->Disconnect();
if (error.Success())
error.SetErrorString("handshake failed");
}
return error;
}
Status PlatformRemoteGDBServer::DisconnectRemote() {
Status error;
m_gdb_client_up.reset();
m_remote_signals_sp.reset();
return error;
}
const char *PlatformRemoteGDBServer::GetHostname() {
if (m_gdb_client_up)
m_gdb_client_up->GetHostname(m_hostname);
if (m_hostname.empty())
return nullptr;
return m_hostname.c_str();
}
std::optional<std::string>
PlatformRemoteGDBServer::DoGetUserName(UserIDResolver::id_t uid) {
std::string name;
if (m_gdb_client_up && m_gdb_client_up->GetUserName(uid, name))
return std::move(name);
return std::nullopt;
}
std::optional<std::string>
PlatformRemoteGDBServer::DoGetGroupName(UserIDResolver::id_t gid) {
std::string name;
if (m_gdb_client_up && m_gdb_client_up->GetGroupName(gid, name))
return std::move(name);
return std::nullopt;
}
uint32_t PlatformRemoteGDBServer::FindProcesses(
const ProcessInstanceInfoMatch &match_info,
ProcessInstanceInfoList &process_infos) {
if (m_gdb_client_up)
return m_gdb_client_up->FindProcesses(match_info, process_infos);
return 0;
}
bool PlatformRemoteGDBServer::GetProcessInfo(
lldb::pid_t pid, ProcessInstanceInfo &process_info) {
if (m_gdb_client_up)
return m_gdb_client_up->GetProcessInfo(pid, process_info);
return false;
}
Status PlatformRemoteGDBServer::LaunchProcess(ProcessLaunchInfo &launch_info) {
Log *log = GetLog(LLDBLog::Platform);
Status error;
LLDB_LOGF(log, "PlatformRemoteGDBServer::%s() called", __FUNCTION__);
if (!IsConnected())
return Status("Not connected.");
auto num_file_actions = launch_info.GetNumFileActions();
for (decltype(num_file_actions) i = 0; i < num_file_actions; ++i) {
const auto file_action = launch_info.GetFileActionAtIndex(i);
if (file_action->GetAction() != FileAction::eFileActionOpen)
continue;
switch (file_action->GetFD()) {
case STDIN_FILENO:
m_gdb_client_up->SetSTDIN(file_action->GetFileSpec());
break;
case STDOUT_FILENO:
m_gdb_client_up->SetSTDOUT(file_action->GetFileSpec());
break;
case STDERR_FILENO:
m_gdb_client_up->SetSTDERR(file_action->GetFileSpec());
break;
}
}
m_gdb_client_up->SetDisableASLR(
launch_info.GetFlags().Test(eLaunchFlagDisableASLR));
m_gdb_client_up->SetDetachOnError(
launch_info.GetFlags().Test(eLaunchFlagDetachOnError));
FileSpec working_dir = launch_info.GetWorkingDirectory();
if (working_dir) {
m_gdb_client_up->SetWorkingDir(working_dir);
}
// Send the environment and the program + arguments after we connect
m_gdb_client_up->SendEnvironment(launch_info.GetEnvironment());
ArchSpec arch_spec = launch_info.GetArchitecture();
const char *arch_triple = arch_spec.GetTriple().str().c_str();
m_gdb_client_up->SendLaunchArchPacket(arch_triple);
LLDB_LOGF(
log,
"PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'",
__FUNCTION__, arch_triple ? arch_triple : "<NULL>");
{
// Scope for the scoped timeout object
process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(
*m_gdb_client_up, std::chrono::seconds(5));
// Since we can't send argv0 separate from the executable path, we need to
// make sure to use the actual executable path found in the launch_info...
Args args = launch_info.GetArguments();
if (FileSpec exe_file = launch_info.GetExecutableFile())
args.ReplaceArgumentAtIndex(0, exe_file.GetPath(false));
if (llvm::Error err = m_gdb_client_up->LaunchProcess(args)) {
error.SetErrorStringWithFormatv("Cannot launch '{0}': {1}",
args.GetArgumentAtIndex(0),
llvm::fmt_consume(std::move(err)));
return error;
}
}
const auto pid = m_gdb_client_up->GetCurrentProcessID(false);
if (pid != LLDB_INVALID_PROCESS_ID) {
launch_info.SetProcessID(pid);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::%s() pid %" PRIu64
" launched successfully",
__FUNCTION__, pid);
} else {
LLDB_LOGF(log,
"PlatformRemoteGDBServer::%s() launch succeeded but we "
"didn't get a valid process id back!",
__FUNCTION__);
error.SetErrorString("failed to get PID");
}
return error;
}
Status PlatformRemoteGDBServer::KillProcess(const lldb::pid_t pid) {
if (!KillSpawnedProcess(pid))
return Status("failed to kill remote spawned process");
return Status();
}
lldb::ProcessSP
PlatformRemoteGDBServer::DebugProcess(ProcessLaunchInfo &launch_info,
Debugger &debugger, Target &target,
Status &error) {
lldb::ProcessSP process_sp;
if (IsRemote()) {
if (IsConnected()) {
lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
std::string connect_url;
if (!LaunchGDBServer(debugserver_pid, connect_url)) {
error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
GetHostname());
} else {
// The darwin always currently uses the GDB remote debugger plug-in
// so even when debugging locally we are debugging remotely!
process_sp = target.CreateProcess(launch_info.GetListener(),
"gdb-remote", nullptr, true);
if (process_sp) {
process_sp->HijackProcessEvents(launch_info.GetHijackListener());
process_sp->SetShadowListener(launch_info.GetShadowListener());
error = process_sp->ConnectRemote(connect_url.c_str());
// Retry the connect remote one time...
if (error.Fail())
error = process_sp->ConnectRemote(connect_url.c_str());
if (error.Success())
error = process_sp->Launch(launch_info);
else if (debugserver_pid != LLDB_INVALID_PROCESS_ID) {
printf("error: connect remote failed (%s)\n", error.AsCString());
KillSpawnedProcess(debugserver_pid);
}
}
}
} else {
error.SetErrorString("not connected to remote gdb server");
}
}
return process_sp;
}
bool PlatformRemoteGDBServer::LaunchGDBServer(lldb::pid_t &pid,
std::string &connect_url) {
assert(IsConnected());
ArchSpec remote_arch = GetRemoteSystemArchitecture();
llvm::Triple &remote_triple = remote_arch.GetTriple();
uint16_t port = 0;
std::string socket_name;
bool launch_result = false;
if (remote_triple.getVendor() == llvm::Triple::Apple &&
remote_triple.getOS() == llvm::Triple::IOS) {
// When remote debugging to iOS, we use a USB mux that always talks to
// localhost, so we will need the remote debugserver to accept connections
// only from localhost, no matter what our current hostname is
launch_result =
m_gdb_client_up->LaunchGDBServer("127.0.0.1", pid, port, socket_name);
} else {
// All other hosts should use their actual hostname
launch_result =
m_gdb_client_up->LaunchGDBServer(nullptr, pid, port, socket_name);
}
if (!launch_result)
return false;
connect_url =
MakeGdbServerUrl(m_platform_scheme, m_platform_hostname, port,
(socket_name.empty()) ? nullptr : socket_name.c_str());
return true;
}
bool PlatformRemoteGDBServer::KillSpawnedProcess(lldb::pid_t pid) {
assert(IsConnected());
return m_gdb_client_up->KillSpawnedProcess(pid);
}
lldb::ProcessSP PlatformRemoteGDBServer::Attach(
ProcessAttachInfo &attach_info, Debugger &debugger,
Target *target, // Can be NULL, if NULL create a new target, else use
// existing one
Status &error) {
lldb::ProcessSP process_sp;
if (IsRemote()) {
if (IsConnected()) {
lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
std::string connect_url;
if (!LaunchGDBServer(debugserver_pid, connect_url)) {
error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
GetHostname());
} else {
if (target == nullptr) {
TargetSP new_target_sp;
error = debugger.GetTargetList().CreateTarget(
debugger, "", "", eLoadDependentsNo, nullptr, new_target_sp);
target = new_target_sp.get();
} else
error.Clear();
if (target && error.Success()) {
// The darwin always currently uses the GDB remote debugger plug-in
// so even when debugging locally we are debugging remotely!
process_sp =
target->CreateProcess(attach_info.GetListenerForProcess(debugger),
"gdb-remote", nullptr, true);
if (process_sp) {
error = process_sp->ConnectRemote(connect_url.c_str());
if (error.Success()) {
ListenerSP listener_sp = attach_info.GetHijackListener();
if (listener_sp)
process_sp->HijackProcessEvents(listener_sp);
process_sp->SetShadowListener(attach_info.GetShadowListener());
error = process_sp->Attach(attach_info);
}
if (error.Fail() && debugserver_pid != LLDB_INVALID_PROCESS_ID) {
KillSpawnedProcess(debugserver_pid);
}
}
}
}
} else {
error.SetErrorString("not connected to remote gdb server");
}
}
return process_sp;
}
Status PlatformRemoteGDBServer::MakeDirectory(const FileSpec &file_spec,
uint32_t mode) {
if (!IsConnected())
return Status("Not connected.");
Status error = m_gdb_client_up->MakeDirectory(file_spec, mode);
Log *log = GetLog(LLDBLog::Platform);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) "
"error = %u (%s)",
file_spec.GetPath().c_str(), mode, error.GetError(),
error.AsCString());
return error;
}
Status PlatformRemoteGDBServer::GetFilePermissions(const FileSpec &file_spec,
uint32_t &file_permissions) {
if (!IsConnected())
return Status("Not connected.");
Status error =
m_gdb_client_up->GetFilePermissions(file_spec, file_permissions);
Log *log = GetLog(LLDBLog::Platform);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::GetFilePermissions(path='%s', "
"file_permissions=%o) error = %u (%s)",
file_spec.GetPath().c_str(), file_permissions, error.GetError(),
error.AsCString());
return error;
}
Status PlatformRemoteGDBServer::SetFilePermissions(const FileSpec &file_spec,
uint32_t file_permissions) {
if (!IsConnected())
return Status("Not connected.");
Status error =
m_gdb_client_up->SetFilePermissions(file_spec, file_permissions);
Log *log = GetLog(LLDBLog::Platform);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::SetFilePermissions(path='%s', "
"file_permissions=%o) error = %u (%s)",
file_spec.GetPath().c_str(), file_permissions, error.GetError(),
error.AsCString());
return error;
}
lldb::user_id_t PlatformRemoteGDBServer::OpenFile(const FileSpec &file_spec,
File::OpenOptions flags,
uint32_t mode,
Status &error) {
if (IsConnected())
return m_gdb_client_up->OpenFile(file_spec, flags, mode, error);
return LLDB_INVALID_UID;
}
bool PlatformRemoteGDBServer::CloseFile(lldb::user_id_t fd, Status &error) {
if (IsConnected())
return m_gdb_client_up->CloseFile(fd, error);
error = Status("Not connected.");
return false;
}
lldb::user_id_t
PlatformRemoteGDBServer::GetFileSize(const FileSpec &file_spec) {
if (IsConnected())
return m_gdb_client_up->GetFileSize(file_spec);
return LLDB_INVALID_UID;
}
void PlatformRemoteGDBServer::AutoCompleteDiskFileOrDirectory(
CompletionRequest &request, bool only_dir) {
if (IsConnected())
m_gdb_client_up->AutoCompleteDiskFileOrDirectory(request, only_dir);
}
uint64_t PlatformRemoteGDBServer::ReadFile(lldb::user_id_t fd, uint64_t offset,
void *dst, uint64_t dst_len,
Status &error) {
if (IsConnected())
return m_gdb_client_up->ReadFile(fd, offset, dst, dst_len, error);
error = Status("Not connected.");
return 0;
}
uint64_t PlatformRemoteGDBServer::WriteFile(lldb::user_id_t fd, uint64_t offset,
const void *src, uint64_t src_len,
Status &error) {
if (IsConnected())
return m_gdb_client_up->WriteFile(fd, offset, src, src_len, error);
error = Status("Not connected.");
return 0;
}
Status PlatformRemoteGDBServer::PutFile(const FileSpec &source,
const FileSpec &destination,
uint32_t uid, uint32_t gid) {
return Platform::PutFile(source, destination, uid, gid);
}
Status PlatformRemoteGDBServer::CreateSymlink(
const FileSpec &src, // The name of the link is in src
const FileSpec &dst) // The symlink points to dst
{
if (!IsConnected())
return Status("Not connected.");
Status error = m_gdb_client_up->CreateSymlink(src, dst);
Log *log = GetLog(LLDBLog::Platform);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::CreateSymlink(src='%s', dst='%s') "
"error = %u (%s)",
src.GetPath().c_str(), dst.GetPath().c_str(), error.GetError(),
error.AsCString());
return error;
}
Status PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {
if (!IsConnected())
return Status("Not connected.");
Status error = m_gdb_client_up->Unlink(file_spec);
Log *log = GetLog(LLDBLog::Platform);
LLDB_LOGF(log, "PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",
file_spec.GetPath().c_str(), error.GetError(), error.AsCString());
return error;
}
bool PlatformRemoteGDBServer::GetFileExists(const FileSpec &file_spec) {
if (IsConnected())
return m_gdb_client_up->GetFileExists(file_spec);
return false;
}
Status PlatformRemoteGDBServer::RunShellCommand(
llvm::StringRef shell, llvm::StringRef command,
const FileSpec &
working_dir, // Pass empty FileSpec to use the current working directory
int *status_ptr, // Pass NULL if you don't want the process exit status
int *signo_ptr, // Pass NULL if you don't want the signal that caused the
// process to exit
std::string
*command_output, // Pass NULL if you don't want the command output
const Timeout<std::micro> &timeout) {
if (!IsConnected())
return Status("Not connected.");
return m_gdb_client_up->RunShellCommand(command, working_dir, status_ptr,
signo_ptr, command_output, timeout);
}
void PlatformRemoteGDBServer::CalculateTrapHandlerSymbolNames() {
m_trap_handlers.push_back(ConstString("_sigtramp"));
}
const UnixSignalsSP &PlatformRemoteGDBServer::GetRemoteUnixSignals() {
if (!IsConnected())
return Platform::GetRemoteUnixSignals();
if (m_remote_signals_sp)
return m_remote_signals_sp;
// If packet not implemented or JSON failed to parse, we'll guess the signal
// set based on the remote architecture.
m_remote_signals_sp = UnixSignals::Create(GetRemoteSystemArchitecture());
StringExtractorGDBRemote response;
auto result =
m_gdb_client_up->SendPacketAndWaitForResponse("jSignalsInfo", response);
if (result != decltype(result)::Success ||
response.GetResponseType() != response.eResponse)
return m_remote_signals_sp;
auto object_sp = StructuredData::ParseJSON(response.GetStringRef());
if (!object_sp || !object_sp->IsValid())
return m_remote_signals_sp;
auto array_sp = object_sp->GetAsArray();
if (!array_sp || !array_sp->IsValid())
return m_remote_signals_sp;
auto remote_signals_sp = std::make_shared<lldb_private::GDBRemoteSignals>();
bool done = array_sp->ForEach(
[&remote_signals_sp](StructuredData::Object *object) -> bool {
if (!object || !object->IsValid())
return false;
auto dict = object->GetAsDictionary();
if (!dict || !dict->IsValid())
return false;
// Signal number and signal name are required.
uint64_t signo;
if (!dict->GetValueForKeyAsInteger("signo", signo))
return false;
llvm::StringRef name;
if (!dict->GetValueForKeyAsString("name", name))
return false;
// We can live without short_name, description, etc.
bool suppress{false};
auto object_sp = dict->GetValueForKey("suppress");
if (object_sp && object_sp->IsValid())
suppress = object_sp->GetBooleanValue();
bool stop{false};
object_sp = dict->GetValueForKey("stop");
if (object_sp && object_sp->IsValid())
stop = object_sp->GetBooleanValue();
bool notify{false};
object_sp = dict->GetValueForKey("notify");
if (object_sp && object_sp->IsValid())
notify = object_sp->GetBooleanValue();
std::string description;
object_sp = dict->GetValueForKey("description");
if (object_sp && object_sp->IsValid())
description = std::string(object_sp->GetStringValue());
llvm::StringRef name_backed, description_backed;
{
std::lock_guard<std::mutex> guard(g_signal_string_mutex);
name_backed =
g_signal_string_storage.insert(name).first->getKeyData();
if (!description.empty())
description_backed =
g_signal_string_storage.insert(description).first->getKeyData();
}
remote_signals_sp->AddSignal(signo, name_backed, suppress, stop, notify,
description_backed);
return true;
});
if (done)
m_remote_signals_sp = std::move(remote_signals_sp);
return m_remote_signals_sp;
}
std::string PlatformRemoteGDBServer::MakeGdbServerUrl(
const std::string &platform_scheme, const std::string &platform_hostname,
uint16_t port, const char *socket_name) {
const char *override_scheme =
getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_SCHEME");
const char *override_hostname =
getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_HOSTNAME");
const char *port_offset_c_str =
getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_PORT_OFFSET");
int port_offset = port_offset_c_str ? ::atoi(port_offset_c_str) : 0;
return MakeUrl(override_scheme ? override_scheme : platform_scheme.c_str(),
override_hostname ? override_hostname
: platform_hostname.c_str(),
port + port_offset, socket_name);
}
std::string PlatformRemoteGDBServer::MakeUrl(const char *scheme,
const char *hostname,
uint16_t port, const char *path) {
StreamString result;
result.Printf("%s://[%s]", scheme, hostname);
if (port != 0)
result.Printf(":%u", port);
if (path)
result.Write(path, strlen(path));
return std::string(result.GetString());
}
size_t PlatformRemoteGDBServer::ConnectToWaitingProcesses(Debugger &debugger,
Status &error) {
std::vector<std::string> connection_urls;
GetPendingGdbServerList(connection_urls);
for (size_t i = 0; i < connection_urls.size(); ++i) {
ConnectProcess(connection_urls[i].c_str(), "gdb-remote", debugger, nullptr, error);
if (error.Fail())
return i; // We already connected to i process successfully
}
return connection_urls.size();
}
size_t PlatformRemoteGDBServer::GetPendingGdbServerList(
std::vector<std::string> &connection_urls) {
std::vector<std::pair<uint16_t, std::string>> remote_servers;
if (!IsConnected())
return 0;
m_gdb_client_up->QueryGDBServer(remote_servers);
for (const auto &gdbserver : remote_servers) {
const char *socket_name_cstr =
gdbserver.second.empty() ? nullptr : gdbserver.second.c_str();
connection_urls.emplace_back(
MakeGdbServerUrl(m_platform_scheme, m_platform_hostname,
gdbserver.first, socket_name_cstr));
}
return connection_urls.size();
}
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