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Introduce a MainLoop class and switch llgs to use it 

Summary:
This is the first part of our effort to make llgs single threaded. Currently, llgs consists of
about three threads and the synchronisation between them is a major source of latency when
debugging linux and android applications.

In order to be able to go single threaded, we must have the ability to listen for events from
multiple sources (primarily, client commands coming over the network and debug events from the
inferior) and perform necessary actions. For this reason I introduce the concept of a MainLoop.
A main loop has the ability to register callback's which will be invoked upon receipt of certain
events. MainLoopPosix has the ability to listen for file descriptors and signals.

For the moment, I have merely made the GDBRemoteCommunicationServerLLGS class use MainLoop
instead of waiting on the network socket directly, but the other threads still remain. In the
followup patches I indend to migrate NativeProcessLinux to this class and remove the remaining
threads.

Reviewers: ovyalov, clayborg, amccarth, zturner, emaste

Subscribers: tberghammer, lldb-commits

Differential Revision: http://reviews.llvm.org/D11066

llvm-svn: 242018
This commit is contained in:
Pavel Labath 2015-07-13 10:44:55 +00:00
parent c9627aeae6
commit 77dc9569c6
14 changed files with 542 additions and 75 deletions

14
lldb/include/lldb/Core/Connection.h
View File

@ -187,6 +187,20 @@ public:
virtual bool
InterruptRead() = 0;
//------------------------------------------------------------------
/// Returns the underlying IOObject used by the Connection.
///
/// The IOObject can be used to wait for data to become available
/// on the connection. If the Connection does not use IOObjects (and
/// hence does not support waiting) this function should return a
/// null pointer.
///
/// @return
/// The underlying IOObject used for reading.
//------------------------------------------------------------------
virtual lldb::IOObjectSP
GetReadObject() { return lldb::IOObjectSP(); }
private:
//------------------------------------------------------------------
// For Connection only

26
lldb/include/lldb/Host/MainLoop.h Normal file
View File

@ -0,0 +1,26 @@
//===-- MainLoop.h ----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_Host_MainLoop_h_
#define lldb_Host_MainLoop_h_
#ifdef _WIN32
namespace lldb_private
{
typedef MainLoopBase MainLoop;
}
#else
#include "lldb/Host/posix/MainLoopPosix.h"
namespace lldb_private
{
typedef MainLoopPosix MainLoop;
}
#endif
#endif // lldb_Host_MainLoop_h_

94
lldb/include/lldb/Host/MainLoopBase.h Normal file
View File

@ -0,0 +1,94 @@
//===-- MainLoopBase.h ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_Host_posix_MainLoopBase_h_
#define lldb_Host_posix_MainLoopBase_h_
#include <functional>
#include "llvm/Support/ErrorHandling.h"
#include "lldb/Core/Error.h"
#include "lldb/Host/IOObject.h"
namespace lldb_private {
// The purpose of this class is to enable multiplexed processing of data from different sources
// without resorting to multi-threading. Clients can register IOObjects, which will be monitored
// for readability, and when they become ready, the specified callback will be invoked.
// Monitoring for writability is not supported, but can be easily added if needed.
//
// The RegisterReadObject function return a handle, which controls the duration of the monitoring. When
// this handle is destroyed, the callback is deregistered.
//
// This class simply defines the interface common for all platforms, actual implementations are
// platform-specific.
class MainLoopBase
{
private:
class ReadHandle;
public:
MainLoopBase() { }
virtual ~MainLoopBase() { }
typedef std::unique_ptr<ReadHandle> ReadHandleUP;
typedef std::function<void(MainLoopBase &)> Callback;
virtual ReadHandleUP
RegisterReadObject(const lldb::IOObjectSP &object_sp, const Callback &callback, Error &error)
{ llvm_unreachable("Not implemented"); }
// Waits for registered events and invoke the proper callbacks. Returns when all callbacks
// deregister themselves or when someone requests termination.
virtual Error
Run()
{ llvm_unreachable("Not implemented"); }
// Requests the exit of the Run() function.
virtual void
RequestTermination()
{ llvm_unreachable("Not implemented"); }
protected:
ReadHandleUP
CreateReadHandle(const lldb::IOObjectSP &object_sp)
{ return ReadHandleUP(new ReadHandle(*this, object_sp)); }
virtual void
UnregisterReadObject(const lldb::IOObjectSP &object_sp)
{ llvm_unreachable("Not implemented"); }
private:
class ReadHandle
{
public:
~ReadHandle() { m_mainloop.UnregisterReadObject(m_object_sp); }
private:
ReadHandle(MainLoopBase &mainloop, const lldb::IOObjectSP &object_sp)
: m_mainloop(mainloop), m_object_sp(object_sp)
{ }
MainLoopBase &m_mainloop;
lldb::IOObjectSP m_object_sp;
friend class MainLoopBase;
DISALLOW_COPY_AND_ASSIGN(ReadHandle);
};
private:
DISALLOW_COPY_AND_ASSIGN(MainLoopBase);
};
} // namespace lldb_private
#endif // lldb_Host_posix_MainLoopBase_h_

7
lldb/include/lldb/Host/posix/ConnectionFileDescriptorPosix.h
View File

@ -59,12 +59,7 @@ class ConnectionFileDescriptor : public Connection
bool InterruptRead() override;
lldb::IOObjectSP
GetReadObject()
{
return m_read_sp;
}
const lldb::IOObjectSP
GetReadObject() const
GetReadObject() override
{
return m_read_sp;
}

100
lldb/include/lldb/Host/posix/MainLoopPosix.h Normal file
View File

@ -0,0 +1,100 @@
//===-- MainLoopPosix.h -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_Host_posix_MainLoopPosix_h_
#define lldb_Host_posix_MainLoopPosix_h_
#include "lldb/Host/MainLoopBase.h"
#include "llvm/ADT/DenseMap.h"
namespace lldb_private {
// Posix implementation of the MainLoopBase class. It can monitor file descriptors for
// readability using pselect. In addition to the common base, this class provides the ability to
// invoke a given handler when a signal is received.
//
// Since this class is primarily intended to be used for single-threaded processing, it does not
// attempt to perform any internal synchronisation and any concurrent accesses must be protected
// externally. However, it is perfectly legitimate to have more than one instance of this class
// running on separate threads, or even a single thread (with some limitations on signal
// monitoring).
// TODO: Add locking if this class is to be used in a multi-threaded context.
class MainLoopPosix: public MainLoopBase
{
private:
class SignalHandle;
public:
typedef std::unique_ptr<SignalHandle> SignalHandleUP;
~MainLoopPosix() override;
ReadHandleUP
RegisterReadObject(const lldb::IOObjectSP &object_sp, const Callback &callback, Error &error) override;
// Listening for signals from multiple MainLoopPosix instances is perfectly safe as long as they
// don't try to listen for the same signal. The callback function is invoked when the control
// returns to the Run() function, not when the hander is executed. This means that you can
// treat the callback as a normal function and perform things which would not be safe in a
// signal handler. However, since the callback is not invoked synchronously, you cannot use
// this mechanism to handle SIGSEGV and the like.
SignalHandleUP
RegisterSignal(int signo, const Callback &callback, Error &error);
Error
Run() override;
// This should only be performed from a callback. Do not attempt to terminate the processing
// from another thread.
// TODO: Add synchronization if we want to be terminated from another thread.
void
RequestTermination() override
{ m_terminate_request = true; }
protected:
void
UnregisterReadObject(const lldb::IOObjectSP &object_sp) override;
void
UnregisterSignal(int signo);
private:
class SignalHandle
{
public:
~SignalHandle() { m_mainloop.UnregisterSignal(m_signo); }
private:
SignalHandle(MainLoopPosix &mainloop, int signo) : m_mainloop(mainloop), m_signo(signo) { }
MainLoopPosix &m_mainloop;
int m_signo;
friend class MainLoopPosix;
DISALLOW_COPY_AND_ASSIGN(SignalHandle);
};
struct SignalInfo
{
Callback callback;
struct sigaction old_action;
bool was_blocked : 1;
};
llvm::DenseMap<IOObject::WaitableHandle, Callback> m_read_fds;
llvm::DenseMap<int, SignalInfo> m_signals;
bool m_terminate_request : 1;
};
} // namespace lldb_private
#endif // lldb_Host_posix_MainLoopPosix_h_

4
lldb/lldb.xcodeproj/project.pbxproj
View File

@ -632,6 +632,7 @@
26FFC19914FC072100087D58 /* AuxVector.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 26FFC19314FC072100087D58 /* AuxVector.cpp */; };
26FFC19B14FC072100087D58 /* DYLDRendezvous.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 26FFC19514FC072100087D58 /* DYLDRendezvous.cpp */; };
26FFC19D14FC072100087D58 /* DynamicLoaderPOSIXDYLD.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 26FFC19714FC072100087D58 /* DynamicLoaderPOSIXDYLD.cpp */; };
30DED5DE1B4ECB49004CC508 /* MainLoopPosix.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 30DED5DC1B4ECB17004CC508 /* MainLoopPosix.cpp */; };
332CCB181AFF41620034D4C4 /* SBLanguageRuntime.h in Headers */ = {isa = PBXBuildFile; fileRef = 3392EBB71AFF402200858B9F /* SBLanguageRuntime.h */; settings = {ATTRIBUTES = (Public, ); }; };
33E5E8421A672A240024ED68 /* StringConvert.cpp in CopyFiles */ = {isa = PBXBuildFile; fileRef = 33E5E8411A672A240024ED68 /* StringConvert.cpp */; };
33E5E8461A6736D30024ED68 /* StringConvert.h in CopyFiles */ = {isa = PBXBuildFile; fileRef = 33E5E8451A6736D30024ED68 /* StringConvert.h */; };
@ -2116,6 +2117,7 @@
26FFC19614FC072100087D58 /* DYLDRendezvous.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DYLDRendezvous.h; sourceTree = "<group>"; };
26FFC19714FC072100087D58 /* DynamicLoaderPOSIXDYLD.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = DynamicLoaderPOSIXDYLD.cpp; sourceTree = "<group>"; };
26FFC19814FC072100087D58 /* DynamicLoaderPOSIXDYLD.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DynamicLoaderPOSIXDYLD.h; sourceTree = "<group>"; };
30DED5DC1B4ECB17004CC508 /* MainLoopPosix.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = MainLoopPosix.cpp; sourceTree = "<group>"; };
33064C991A5C7A330033D415 /* UriParser.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = UriParser.cpp; path = source/Utility/UriParser.cpp; sourceTree = "<group>"; };
33064C9B1A5C7A490033D415 /* UriParser.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = UriParser.h; path = source/Utility/UriParser.h; sourceTree = "<group>"; };
3392EBB71AFF402200858B9F /* SBLanguageRuntime.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = SBLanguageRuntime.h; path = include/lldb/API/SBLanguageRuntime.h; sourceTree = "<group>"; };
@ -4891,6 +4893,7 @@
isa = PBXGroup;
children = (
255EFF751AFABA950069F277 /* LockFilePosix.cpp */,
30DED5DC1B4ECB17004CC508 /* MainLoopPosix.cpp */,
AFDFDFD019E34D3400EAE509 /* ConnectionFileDescriptorPosix.cpp */,
3FDFDDC5199D37ED009756A7 /* FileSystem.cpp */,
3FDFE53019A292F0009756A7 /* HostInfoPosix.cpp */,
@ -6565,6 +6568,7 @@
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
files = (
30DED5DE1B4ECB49004CC508 /* MainLoopPosix.cpp in Sources */,
E769331C1A94D15400C73337 /* lldb-gdbserver.cpp in Sources */,
26DC6A1D1337FECA00FF7998 /* lldb-platform.cpp in Sources */,
E769331E1A94D18100C73337 /* lldb-server.cpp in Sources */,

1
lldb/source/Host/CMakeLists.txt
View File

@ -76,6 +76,7 @@ else()
posix/HostProcessPosix.cpp
posix/HostThreadPosix.cpp
posix/LockFilePosix.cpp
posix/MainLoopPosix.cpp
posix/PipePosix.cpp
)

193
lldb/source/Host/posix/MainLoopPosix.cpp Normal file
View File

@ -0,0 +1,193 @@
//===-- MainLoopPosix.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/posix/MainLoopPosix.h"
#include <vector>
#include "lldb/Core/Error.h"
using namespace lldb;
using namespace lldb_private;
static sig_atomic_t g_signal_flags[NSIG];
static void
SignalHandler(int signo, siginfo_t *info, void *)
{
assert(signo < NSIG);
g_signal_flags[signo] = 1;
}
MainLoopPosix::~MainLoopPosix()
{
assert(m_read_fds.size() == 0);
assert(m_signals.size() == 0);
}
MainLoopPosix::ReadHandleUP
MainLoopPosix::RegisterReadObject(const IOObjectSP &object_sp, const Callback &callback, Error &error)
{
if (!object_sp || !object_sp->IsValid())
{
error.SetErrorString("IO object is not valid.");
return nullptr;
}
const bool inserted = m_read_fds.insert({object_sp->GetWaitableHandle(), callback}).second;
if (! inserted)
{
error.SetErrorStringWithFormat("File descriptor %d already monitored.",
object_sp->GetWaitableHandle());
return nullptr;
}
return CreateReadHandle(object_sp);
}
// We shall block the signal, then install the signal handler. The signal will be unblocked in
// the Run() function to check for signal delivery.
MainLoopPosix::SignalHandleUP
MainLoopPosix::RegisterSignal(int signo, const Callback &callback, Error &error)
{
if (m_signals.find(signo) != m_signals.end())
{
error.SetErrorStringWithFormat("Signal %d already monitored.", signo);
return nullptr;
}
SignalInfo info;
info.callback = callback;
struct sigaction new_action;
new_action.sa_sigaction = &SignalHandler;
new_action.sa_flags = SA_SIGINFO;
sigemptyset(&new_action.sa_mask);
sigaddset(&new_action.sa_mask, signo);
sigset_t old_set;
if (int ret = pthread_sigmask(SIG_BLOCK, &new_action.sa_mask, &old_set))
{
error.SetErrorStringWithFormat("pthread_sigmask failed with error %d\n", ret);
return nullptr;
}
info.was_blocked = sigismember(&old_set, signo);
if (sigaction(signo, &new_action, &info.old_action) == -1)
{
error.SetErrorToErrno();
if (!info.was_blocked)
pthread_sigmask(SIG_UNBLOCK, &new_action.sa_mask, nullptr);
return nullptr;
}
m_signals.insert({signo, info});
g_signal_flags[signo] = 0;
return SignalHandleUP(new SignalHandle(*this, signo));
}
void
MainLoopPosix::UnregisterReadObject(const lldb::IOObjectSP &object_sp)
{
bool erased = m_read_fds.erase(object_sp->GetWaitableHandle());
(void) erased;
assert(erased);
}
void
MainLoopPosix::UnregisterSignal(int signo)
{
// We undo the actions of RegisterSignal on a best-effort basis.
auto it = m_signals.find(signo);
assert(it != m_signals.end());
sigaction(signo, &it->second.old_action, nullptr);
sigset_t set;
sigemptyset(&set);
sigaddset(&set, signo);
pthread_sigmask(it->second.was_blocked ? SIG_BLOCK : SIG_UNBLOCK, &set, nullptr);
m_signals.erase(it);
}
Error
MainLoopPosix::Run()
{
std::vector<int> signals;
sigset_t sigmask;
std::vector<int> read_fds;
fd_set read_fd_set;
m_terminate_request = false;
// run until termination or until we run out of things to listen to
while (! m_terminate_request && (!m_read_fds.empty() || !m_signals.empty()))
{
// To avoid problems with callbacks changing the things we're supposed to listen to, we
// will store the *real* list of events separately.
signals.clear();
read_fds.clear();
FD_ZERO(&read_fd_set);
int nfds = 0;
if (int ret = pthread_sigmask(SIG_SETMASK, nullptr, &sigmask))
return Error("pthread_sigmask failed with error %d\n", ret);
for (const auto &fd: m_read_fds)
{
read_fds.push_back(fd.first);
FD_SET(fd.first, &read_fd_set);
nfds = std::max(nfds, fd.first+1);
}
for (const auto &sig: m_signals)
{
signals.push_back(sig.first);
sigdelset(&sigmask, sig.first);
}
if (pselect(nfds, &read_fd_set, nullptr, nullptr, nullptr, &sigmask) == -1 && errno != EINTR)
return Error(errno, eErrorTypePOSIX);
for (int sig: signals)
{
if (g_signal_flags[sig] == 0)
continue; // No signal
g_signal_flags[sig] = 0;
auto it = m_signals.find(sig);
if (it == m_signals.end())
continue; // Signal must have gotten unregistered in the meantime
it->second.callback(*this); // Do the work
if (m_terminate_request)
return Error();
}
for (int fd: read_fds)
{
if (!FD_ISSET(fd, &read_fd_set))
continue; // Not ready
auto it = m_read_fds.find(fd);
if (it == m_read_fds.end())
continue; // File descriptor must have gotten unregistered in the meantime
it->second(*this); // Do the work
if (m_terminate_request)
return Error();
}
}
return Error();
}

2
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp
View File

@ -132,7 +132,7 @@ GDBRemoteCommunicationServer::SendOKResponse ()
}
bool
GDBRemoteCommunicationServer::HandshakeWithClient(Error *error_ptr)
GDBRemoteCommunicationServer::HandshakeWithClient()
{
return GetAck() == PacketResult::Success;
}

2
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h
View File

@ -54,7 +54,7 @@ public:
// After connecting, do a little handshake with the client to make sure
// we are at least communicating
bool
HandshakeWithClient (Error *error_ptr);
HandshakeWithClient ();
protected:
std::map<StringExtractorGDBRemote::ServerPacketType, PacketHandler> m_packet_handlers;

60
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
View File

@ -75,10 +75,11 @@ namespace
// GDBRemoteCommunicationServerLLGS constructor
//----------------------------------------------------------------------
GDBRemoteCommunicationServerLLGS::GDBRemoteCommunicationServerLLGS(
const lldb::PlatformSP& platform_sp) :
const lldb::PlatformSP& platform_sp,
MainLoop &mainloop) :
GDBRemoteCommunicationServerCommon ("gdb-remote.server", "gdb-remote.server.rx_packet"),
m_platform_sp (platform_sp),
m_async_thread (LLDB_INVALID_HOST_THREAD),
m_mainloop (mainloop),
m_current_tid (LLDB_INVALID_THREAD_ID),
m_continue_tid (LLDB_INVALID_THREAD_ID),
m_debugged_process_mutex (Mutex::eMutexTypeRecursive),
@ -88,7 +89,8 @@ GDBRemoteCommunicationServerLLGS::GDBRemoteCommunicationServerLLGS(
m_active_auxv_buffer_sp (),
m_saved_registers_mutex (),
m_saved_registers_map (),
m_next_saved_registers_id (1)
m_next_saved_registers_id (1),
m_handshake_completed (false)
{
assert(platform_sp);
RegisterPacketHandlers();
@ -782,6 +784,58 @@ GDBRemoteCommunicationServerLLGS::DidExec (NativeProcessProtocol *process)
ClearProcessSpecificData ();
}
void
GDBRemoteCommunicationServerLLGS::DataAvailableCallback ()
{
Log *log (GetLogIfAnyCategoriesSet(GDBR_LOG_COMM));
if (! m_handshake_completed)
{
if (! HandshakeWithClient())
{
if(log)
log->Printf("GDBRemoteCommunicationServerLLGS::%s handshake with client failed, exiting",
__FUNCTION__);
m_read_handle_up.reset();
m_mainloop.RequestTermination();
return;
}
m_handshake_completed = true;
}
bool interrupt = false;
bool done = false;
Error error;
while (true)
{
const PacketResult result = GetPacketAndSendResponse (0, error, interrupt, done);
if (result == PacketResult::ErrorReplyTimeout)
break; // No more packets in the queue
if ((result != PacketResult::Success))
{
if(log)
log->Printf("GDBRemoteCommunicationServerLLGS::%s processing a packet failed: %s",
__FUNCTION__, error.AsCString());
m_read_handle_up.reset();
m_mainloop.RequestTermination();
break;
}
}
}
Error
GDBRemoteCommunicationServerLLGS::InitializeConnection (std::unique_ptr<Connection> &&connection)
{
IOObjectSP read_object_sp = connection->GetReadObject();
GDBRemoteCommunicationServer::SetConnection(connection.release());
Error error;
m_read_handle_up = m_mainloop.RegisterReadObject(read_object_sp,
[this] (MainLoopBase &) { DataAvailableCallback(); }, error);
return error;
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServerLLGS::SendONotification (const char *buffer, uint32_t len)
{

14
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
View File

@ -19,6 +19,7 @@
#include "lldb/Core/Communication.h"
#include "lldb/Host/Mutex.h"
#include "lldb/Host/common/NativeProcessProtocol.h"
#include "lldb/Host/MainLoop.h"
// Project includes
#include "GDBRemoteCommunicationServerCommon.h"
@ -26,6 +27,7 @@
class StringExtractorGDBRemote;
namespace lldb_private {
namespace process_gdb_remote {
class ProcessGDBRemote;
@ -38,7 +40,7 @@ public:
//------------------------------------------------------------------
// Constructors and Destructors
//------------------------------------------------------------------
GDBRemoteCommunicationServerLLGS(const lldb::PlatformSP& platform_sp);
GDBRemoteCommunicationServerLLGS(const lldb::PlatformSP& platform_sp, MainLoop &mainloop);
virtual
~GDBRemoteCommunicationServerLLGS();
@ -111,9 +113,13 @@ public:
void
DidExec (NativeProcessProtocol *process) override;
Error
InitializeConnection (std::unique_ptr<Connection> &&connection);
protected:
lldb::PlatformSP m_platform_sp;
lldb::thread_t m_async_thread;
MainLoop &m_mainloop;
MainLoop::ReadHandleUP m_read_handle_up;
lldb::tid_t m_current_tid;
lldb::tid_t m_continue_tid;
Mutex m_debugged_process_mutex;
@ -124,6 +130,7 @@ protected:
Mutex m_saved_registers_mutex;
std::unordered_map<uint32_t, lldb::DataBufferSP> m_saved_registers_map;
uint32_t m_next_saved_registers_id;
bool m_handshake_completed : 1;
PacketResult
SendONotification (const char *buffer, uint32_t len);
@ -295,6 +302,9 @@ private:
void
RegisterPacketHandlers ();
void
DataAvailableCallback ();
//------------------------------------------------------------------
// For GDBRemoteCommunicationServerLLGS only
//------------------------------------------------------------------

98
lldb/tools/lldb-server/lldb-gdbserver.cpp
View File

@ -109,16 +109,21 @@ signal_handler(int signo)
case SIGPIPE:
g_sigpipe_received = 1;
break;
case SIGHUP:
++g_sighup_received_count;
// For now, swallow SIGHUP.
if (log)
log->Printf ("lldb-server:%s swallowing SIGHUP (receive count=%d)", __FUNCTION__, g_sighup_received_count);
signal (SIGHUP, signal_handler);
break;
}
}
static void
sighup_handler(MainLoopBase &mainloop)
{
++g_sighup_received_count;
Log *log (GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS));
if (log)
log->Printf ("lldb-server:%s swallowing SIGHUP (receive count=%d)", __FUNCTION__, g_sighup_received_count);
if (g_sighup_received_count >= 2)
mainloop.RequestTermination();
}
#endif // #ifndef _WIN32
static void
@ -338,7 +343,7 @@ writePortToPipe(int unnamed_pipe_fd, const uint16_t port)
}
void
ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
ConnectToRemote(MainLoop &mainloop, GDBRemoteCommunicationServerLLGS &gdb_server,
bool reverse_connect, const char *const host_and_port,
const char *const progname, const char *const subcommand,
const char *const named_pipe_path, int unnamed_pipe_fd)
@ -372,6 +377,8 @@ ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
exit (1);
}
std::unique_ptr<ConnectionFileDescriptor> connection_up;
if (reverse_connect)
{
// llgs will connect to the gdb-remote client.
@ -388,8 +395,7 @@ ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
snprintf(connection_url, sizeof(connection_url), "connect://%s", final_host_and_port.c_str ());
// Create the connection.
std::unique_ptr<ConnectionFileDescriptor> connection_up (new ConnectionFileDescriptor ());
connection_up.reset (new ConnectionFileDescriptor ());
connection_up.reset(new ConnectionFileDescriptor);
auto connection_result = connection_up->Connect (connection_url, &error);
if (connection_result != eConnectionStatusSuccess)
{
@ -401,10 +407,6 @@ ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
fprintf (stderr, "error: failed to connect to client at '%s': %s", connection_url, error.AsCString ());
exit (-1);
}
// We're connected.
printf ("Connection established.\n");
gdb_server.SetConnection (connection_up.release());
}
else
{
@ -461,10 +463,7 @@ ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
// Ensure we connected.
if (s_listen_connection_up)
{
printf ("Connection established '%s'\n", s_listen_connection_up->GetURI().c_str());
gdb_server.SetConnection (s_listen_connection_up.release());
}
connection_up = std::move(s_listen_connection_up);
else
{
fprintf (stderr, "failed to connect to '%s': %s\n", final_host_and_port.c_str (), error.AsCString ());
@ -472,46 +471,13 @@ ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
exit (1);
}
}
}
if (gdb_server.IsConnected())
{
// After we connected, we need to get an initial ack from...
if (gdb_server.HandshakeWithClient(&error))
error = gdb_server.InitializeConnection (std::move(connection_up));
if (error.Fail())
{
// We'll use a half a second timeout interval so that an exit conditions can
// be checked that often.
const uint32_t TIMEOUT_USEC = 500000;
bool interrupt = false;
bool done = false;
while (!interrupt && !done && (g_sighup_received_count < 2))
{
const GDBRemoteCommunication::PacketResult result = gdb_server.GetPacketAndSendResponse (TIMEOUT_USEC, error, interrupt, done);
if ((result != GDBRemoteCommunication::PacketResult::Success) &&
(result != GDBRemoteCommunication::PacketResult::ErrorReplyTimeout))
{
// We're bailing out - we only support successful handling and timeouts.
fprintf(stderr, "leaving packet loop due to PacketResult %d\n", result);
break;
}
}
if (error.Fail())
{
fprintf(stderr, "error: %s\n", error.AsCString());
}
fprintf(stderr, "Failed to initialize connection: %s\n", error.AsCString());
exit(-1);
}
else
{
fprintf(stderr, "error: handshake with client failed\n");
}
}
else
{
fprintf (stderr, "no connection information provided, unable to run\n");
display_usage (progname, subcommand);
exit (1);
printf ("Connection established.\n");
}
}
@ -521,10 +487,12 @@ ConnectToRemote(GDBRemoteCommunicationServerLLGS &gdb_server,
int
main_gdbserver (int argc, char *argv[])
{
Error error;
MainLoop mainloop;
#ifndef _WIN32
// Setup signal handlers first thing.
signal (SIGPIPE, signal_handler);
signal (SIGHUP, signal_handler);
MainLoop::SignalHandleUP sighup_handle = mainloop.RegisterSignal(SIGHUP, sighup_handler, error);
#endif
#ifdef __linux__
// Block delivery of SIGCHLD on linux. NativeProcessLinux will read it using signalfd.
@ -539,7 +507,6 @@ main_gdbserver (int argc, char *argv[])
argc--;
argv++;
int long_option_index = 0;
Error error;
int ch;
std::string platform_name;
std::string attach_target;
@ -670,7 +637,7 @@ main_gdbserver (int argc, char *argv[])
// Setup the platform that GDBRemoteCommunicationServerLLGS will use.
lldb::PlatformSP platform_sp = setup_platform (platform_name);
GDBRemoteCommunicationServerLLGS gdb_server (platform_sp);
GDBRemoteCommunicationServerLLGS gdb_server (platform_sp, mainloop);
const char *const host_and_port = argv[0];
argc -= 1;
@ -688,10 +655,19 @@ main_gdbserver (int argc, char *argv[])
// Print version info.
printf("%s-%s", LLGS_PROGRAM_NAME, LLGS_VERSION_STR);
ConnectToRemote(gdb_server, reverse_connect,
ConnectToRemote(mainloop, gdb_server, reverse_connect,
host_and_port, progname, subcommand,
named_pipe_path.c_str(), unnamed_pipe_fd);
if (! gdb_server.IsConnected())
{
fprintf (stderr, "no connection information provided, unable to run\n");
display_usage (progname, subcommand);
return 1;
}
mainloop.Run();
fprintf(stderr, "lldb-server exiting...\n");
return 0;

2
lldb/tools/lldb-server/lldb-platform.cpp
View File

@ -362,7 +362,7 @@ main_platform (int argc, char *argv[])
if (platform.IsConnected())
{
// After we connected, we need to get an initial ack from...
if (platform.HandshakeWithClient(&error))
if (platform.HandshakeWithClient())
{
bool interrupt = false;
bool done = false;