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llvm-project/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp
Jim Ingham 379f24ffde Revert "Revert "Reset the wakeup timeout when we re-enter the continue wait."" 
This reverts commit 82a38837150099288a1262391ef43e1fd69ffde4.

The original version had a copy-paste error: using the Interrupt timeout
for the ResumeSynchronous wait, which is clearly wrong.  This error would
have been evident with real use, but the interrupt is long enough that it
only caused one testsuite failure (in the Swift fork).

Anyway, I found that mistake and fixed it and checked all the other places
where I had to plumb through a timeout, and added a test with a short
interrupt timeout stepping over a function that takes 3x the interrupt timeout
to complete, so that should detect a similar mistake in the future.
2021-07-12 14:20:49 -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/Core/StreamFile.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/Log.h"
#include "lldb/Utility/ProcessInfo.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/UriParser.h"
#include "Plugins/Process/Utility/GDBRemoteSignals.h"
#include "Plugins/Process/gdb-remote/ProcessGDBRemote.h"
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;
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();
}
ConstString PlatformRemoteGDBServer::GetPluginNameStatic() {
static ConstString g_name("remote-gdb-server");
return g_name;
}
const char *PlatformRemoteGDBServer::GetDescriptionStatic() {
return "A platform that uses the GDB remote protocol as the communication "
"transport.";
}
const char *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();
}
Status PlatformRemoteGDBServer::ResolveExecutable(
const ModuleSpec &module_spec, lldb::ModuleSP &exe_module_sp,
const FileSpecList *module_search_paths_ptr) {
// copied from PlatformRemoteiOS
Status error;
// Nothing special to do here, just use the actual file and architecture
ModuleSpec resolved_module_spec(module_spec);
// Resolve any executable within an apk on Android?
// Host::ResolveExecutableInBundle (resolved_module_spec.GetFileSpec());
if (FileSystem::Instance().Exists(resolved_module_spec.GetFileSpec()) ||
module_spec.GetUUID().IsValid()) {
if (resolved_module_spec.GetArchitecture().IsValid() ||
resolved_module_spec.GetUUID().IsValid()) {
error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
module_search_paths_ptr, nullptr,
nullptr);
if (exe_module_sp && exe_module_sp->GetObjectFile())
return error;
exe_module_sp.reset();
}
// No valid architecture was specified or the exact arch wasn't found so
// ask the platform for the architectures that we should be using (in the
// correct order) and see if we can find a match that way
StreamString arch_names;
for (uint32_t idx = 0; GetSupportedArchitectureAtIndex(
idx, resolved_module_spec.GetArchitecture());
++idx) {
error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
module_search_paths_ptr, nullptr,
nullptr);
// Did we find an executable using one of the
if (error.Success()) {
if (exe_module_sp && exe_module_sp->GetObjectFile())
break;
else
error.SetErrorToGenericError();
}
if (idx > 0)
arch_names.PutCString(", ");
arch_names.PutCString(
resolved_module_spec.GetArchitecture().GetArchitectureName());
}
if (error.Fail() || !exe_module_sp) {
if (FileSystem::Instance().Readable(resolved_module_spec.GetFileSpec())) {
error.SetErrorStringWithFormat(
"'%s' doesn't contain any '%s' platform architectures: %s",
resolved_module_spec.GetFileSpec().GetPath().c_str(),
GetPluginName().GetCString(), arch_names.GetData());
} else {
error.SetErrorStringWithFormat(
"'%s' is not readable",
resolved_module_spec.GetFileSpec().GetPath().c_str());
}
}
} else {
error.SetErrorStringWithFormat(
"'%s' does not exist",
resolved_module_spec.GetFileSpec().GetPath().c_str());
}
return error;
}
bool PlatformRemoteGDBServer::GetModuleSpec(const FileSpec &module_file_spec,
const ArchSpec &arch,
ModuleSpec &module_spec) {
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
const auto module_path = module_file_spec.GetPath(false);
if (!m_gdb_client.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(false), // This is a remote platform
m_gdb_client() {
m_gdb_client.SetPacketTimeout(
process_gdb_remote::ProcessGDBRemote::GetPacketTimeout());
}
/// Destructor.
///
/// The destructor is virtual since this class is designed to be
/// inherited from by the plug-in instance.
PlatformRemoteGDBServer::~PlatformRemoteGDBServer() = default;
bool PlatformRemoteGDBServer::GetSupportedArchitectureAtIndex(uint32_t idx,
ArchSpec &arch) {
ArchSpec remote_arch = m_gdb_client.GetSystemArchitecture();
if (idx == 0) {
arch = remote_arch;
return arch.IsValid();
} else if (idx == 1 && remote_arch.IsValid() &&
remote_arch.GetTriple().isArch64Bit()) {
arch.SetTriple(remote_arch.GetTriple().get32BitArchVariant());
return arch.IsValid();
}
return false;
}
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() {
m_os_version = m_gdb_client.GetOSVersion();
return !m_os_version.empty();
}
bool PlatformRemoteGDBServer::GetRemoteOSBuildString(std::string &s) {
return m_gdb_client.GetOSBuildString(s);
}
bool PlatformRemoteGDBServer::GetRemoteOSKernelDescription(std::string &s) {
return m_gdb_client.GetOSKernelDescription(s);
}
// Remote Platform subclasses need to override this function
ArchSpec PlatformRemoteGDBServer::GetRemoteSystemArchitecture() {
return m_gdb_client.GetSystemArchitecture();
}
FileSpec PlatformRemoteGDBServer::GetRemoteWorkingDirectory() {
if (IsConnected()) {
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
FileSpec working_dir;
if (m_gdb_client.GetWorkingDir(working_dir) && log)
LLDB_LOGF(log,
"PlatformRemoteGDBServer::GetRemoteWorkingDirectory() -> '%s'",
working_dir.GetCString());
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 = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
LLDB_LOGF(log, "PlatformRemoteGDBServer::SetRemoteWorkingDirectory('%s')",
working_dir.GetCString());
return m_gdb_client.SetWorkingDir(working_dir) == 0;
} else
return Platform::SetRemoteWorkingDirectory(working_dir);
}
bool PlatformRemoteGDBServer::IsConnected() const {
return m_gdb_client.IsConnected();
}
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.");
int port;
llvm::StringRef scheme, hostname, pathname;
if (!UriParser::Parse(url, scheme, hostname, port, pathname))
return Status("Invalid URL: %s", url);
// We're going to reuse the hostname when we connect to the debugserver.
m_platform_scheme = std::string(scheme);
m_platform_hostname = std::string(hostname);
m_gdb_client.SetConnection(std::make_unique<ConnectionFileDescriptor>());
if (repro::Reproducer::Instance().IsReplaying()) {
error = m_gdb_replay_server.Connect(m_gdb_client);
if (error.Success())
m_gdb_replay_server.StartAsyncThread();
} else {
if (repro::Generator *g = repro::Reproducer::Instance().GetGenerator()) {
repro::GDBRemoteProvider &provider =
g->GetOrCreate<repro::GDBRemoteProvider>();
m_gdb_client.SetPacketRecorder(provider.GetNewPacketRecorder());
}
m_gdb_client.Connect(url, &error);
}
if (error.Fail())
return error;
if (m_gdb_client.HandshakeWithServer(&error)) {
m_gdb_client.GetHostInfo();
// If a working directory was set prior to connecting, send it down
// now.
if (m_working_dir)
m_gdb_client.SetWorkingDir(m_working_dir);
} else {
m_gdb_client.Disconnect();
if (error.Success())
error.SetErrorString("handshake failed");
}
return error;
}
Status PlatformRemoteGDBServer::DisconnectRemote() {
Status error;
m_gdb_client.Disconnect(&error);
m_remote_signals_sp.reset();
return error;
}
const char *PlatformRemoteGDBServer::GetHostname() {
m_gdb_client.GetHostname(m_name);
if (m_name.empty())
return nullptr;
return m_name.c_str();
}
llvm::Optional<std::string>
PlatformRemoteGDBServer::DoGetUserName(UserIDResolver::id_t uid) {
std::string name;
if (m_gdb_client.GetUserName(uid, name))
return std::move(name);
return llvm::None;
}
llvm::Optional<std::string>
PlatformRemoteGDBServer::DoGetGroupName(UserIDResolver::id_t gid) {
std::string name;
if (m_gdb_client.GetGroupName(gid, name))
return std::move(name);
return llvm::None;
}
uint32_t PlatformRemoteGDBServer::FindProcesses(
const ProcessInstanceInfoMatch &match_info,
ProcessInstanceInfoList &process_infos) {
return m_gdb_client.FindProcesses(match_info, process_infos);
}
bool PlatformRemoteGDBServer::GetProcessInfo(
lldb::pid_t pid, ProcessInstanceInfo &process_info) {
return m_gdb_client.GetProcessInfo(pid, process_info);
}
Status PlatformRemoteGDBServer::LaunchProcess(ProcessLaunchInfo &launch_info) {
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
Status error;
LLDB_LOGF(log, "PlatformRemoteGDBServer::%s() called", __FUNCTION__);
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.SetSTDIN(file_action->GetFileSpec());
break;
case STDOUT_FILENO:
m_gdb_client.SetSTDOUT(file_action->GetFileSpec());
break;
case STDERR_FILENO:
m_gdb_client.SetSTDERR(file_action->GetFileSpec());
break;
}
}
m_gdb_client.SetDisableASLR(
launch_info.GetFlags().Test(eLaunchFlagDisableASLR));
m_gdb_client.SetDetachOnError(
launch_info.GetFlags().Test(eLaunchFlagDetachOnError));
FileSpec working_dir = launch_info.GetWorkingDirectory();
if (working_dir) {
m_gdb_client.SetWorkingDir(working_dir);
}
// Send the environment and the program + arguments after we connect
m_gdb_client.SendEnvironment(launch_info.GetEnvironment());
ArchSpec arch_spec = launch_info.GetArchitecture();
const char *arch_triple = arch_spec.GetTriple().str().c_str();
m_gdb_client.SendLaunchArchPacket(arch_triple);
LLDB_LOGF(
log,
"PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'",
__FUNCTION__, arch_triple ? arch_triple : "<NULL>");
int arg_packet_err;
{
// Scope for the scoped timeout object
process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(
m_gdb_client, std::chrono::seconds(5));
arg_packet_err = m_gdb_client.SendArgumentsPacket(launch_info);
}
if (arg_packet_err == 0) {
std::string error_str;
if (m_gdb_client.GetLaunchSuccess(error_str)) {
const auto pid = m_gdb_client.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");
}
} else {
error.SetErrorString(error_str.c_str());
LLDB_LOGF(log, "PlatformRemoteGDBServer::%s() launch failed: %s",
__FUNCTION__, error.AsCString());
}
} else {
error.SetErrorStringWithFormat("'A' packet returned an error: %i",
arg_packet_err);
}
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, // 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(launch_info.GetListener(),
"gdb-remote", nullptr, true);
if (process_sp) {
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) {
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.LaunchGDBServer("127.0.0.1", pid, port, socket_name);
} else {
// All other hosts should use their actual hostname
launch_result =
m_gdb_client.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) {
return m_gdb_client.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);
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) {
Status error = m_gdb_client.MakeDirectory(file_spec, mode);
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) "
"error = %u (%s)",
file_spec.GetCString(), mode, error.GetError(), error.AsCString());
return error;
}
Status PlatformRemoteGDBServer::GetFilePermissions(const FileSpec &file_spec,
uint32_t &file_permissions) {
Status error = m_gdb_client.GetFilePermissions(file_spec, file_permissions);
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::GetFilePermissions(path='%s', "
"file_permissions=%o) error = %u (%s)",
file_spec.GetCString(), file_permissions, error.GetError(),
error.AsCString());
return error;
}
Status PlatformRemoteGDBServer::SetFilePermissions(const FileSpec &file_spec,
uint32_t file_permissions) {
Status error = m_gdb_client.SetFilePermissions(file_spec, file_permissions);
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::SetFilePermissions(path='%s', "
"file_permissions=%o) error = %u (%s)",
file_spec.GetCString(), 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) {
return m_gdb_client.OpenFile(file_spec, flags, mode, error);
}
bool PlatformRemoteGDBServer::CloseFile(lldb::user_id_t fd, Status &error) {
return m_gdb_client.CloseFile(fd, error);
}
lldb::user_id_t
PlatformRemoteGDBServer::GetFileSize(const FileSpec &file_spec) {
return m_gdb_client.GetFileSize(file_spec);
}
void PlatformRemoteGDBServer::AutoCompleteDiskFileOrDirectory(
CompletionRequest &request, bool only_dir) {
m_gdb_client.AutoCompleteDiskFileOrDirectory(request, only_dir);
}
uint64_t PlatformRemoteGDBServer::ReadFile(lldb::user_id_t fd, uint64_t offset,
void *dst, uint64_t dst_len,
Status &error) {
return m_gdb_client.ReadFile(fd, offset, dst, dst_len, error);
}
uint64_t PlatformRemoteGDBServer::WriteFile(lldb::user_id_t fd, uint64_t offset,
const void *src, uint64_t src_len,
Status &error) {
return m_gdb_client.WriteFile(fd, offset, src, src_len, error);
}
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
{
Status error = m_gdb_client.CreateSymlink(src, dst);
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
LLDB_LOGF(log,
"PlatformRemoteGDBServer::CreateSymlink(src='%s', dst='%s') "
"error = %u (%s)",
src.GetCString(), dst.GetCString(), error.GetError(),
error.AsCString());
return error;
}
Status PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {
Status error = m_gdb_client.Unlink(file_spec);
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
LLDB_LOGF(log, "PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",
file_spec.GetCString(), error.GetError(), error.AsCString());
return error;
}
bool PlatformRemoteGDBServer::GetFileExists(const FileSpec &file_spec) {
return m_gdb_client.GetFileExists(file_spec);
}
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) {
return m_gdb_client.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.SendPacketAndWaitForResponse("jSignalsInfo", response);
if (result != decltype(result)::Success ||
response.GetResponseType() != response.eResponse)
return m_remote_signals_sp;
auto object_sp =
StructuredData::ParseJSON(std::string(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.
int 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());
remote_signals_sp->AddSignal(signo, name.str().c_str(), suppress, stop,
notify, description.c_str());
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 succsessfully
}
return connection_urls.size();
}
size_t PlatformRemoteGDBServer::GetPendingGdbServerList(
std::vector<std::string> &connection_urls) {
std::vector<std::pair<uint16_t, std::string>> remote_servers;
m_gdb_client.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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