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Revert "[NativeProcessLinux] Integrate MainLoop"

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This seems to be causing major slowdows on the android buildbot. Reverting while I investigate.

llvm-svn: 242391
This commit is contained in:
Pavel Labath
2015-07-16 08:45:03 +00:00
parent d783a98303
commit 5abe726911
9 changed files with 811 additions and 276 deletions
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814
lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
View File

@@ -11,6 +11,7 @@
// C Includes
#include <errno.h>
#include <semaphore.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
@@ -212,8 +213,157 @@ namespace
}
}
static constexpr unsigned k_ptrace_word_size = sizeof(void*);
static_assert(sizeof(long) >= k_ptrace_word_size, "Size of long must be larger than ptrace word size");
//------------------------------------------------------------------------------
// Static implementations of NativeProcessLinux::ReadMemory and
// NativeProcessLinux::WriteMemory. This enables mutual recursion between these
// functions without needed to go thru the thread funnel.
Error
DoReadMemory(
lldb::pid_t pid,
lldb::addr_t vm_addr,
void *buf,
size_t size,
size_t &bytes_read)
{
// ptrace word size is determined by the host, not the child
static const unsigned word_size = sizeof(void*);
unsigned char *dst = static_cast<unsigned char*>(buf);
size_t remainder;
long data;
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_ALL));
if (log)
ProcessPOSIXLog::IncNestLevel();
if (log && ProcessPOSIXLog::AtTopNestLevel() && log->GetMask().Test(POSIX_LOG_MEMORY))
log->Printf ("NativeProcessLinux::%s(%" PRIu64 ", %d, %p, %p, %zd, _)", __FUNCTION__,
pid, word_size, (void*)vm_addr, buf, size);
assert(sizeof(data) >= word_size);
for (bytes_read = 0; bytes_read < size; bytes_read += remainder)
{
Error error = NativeProcessLinux::PtraceWrapper(PTRACE_PEEKDATA, pid, (void*)vm_addr, nullptr, 0, &data);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
remainder = size - bytes_read;
remainder = remainder > word_size ? word_size : remainder;
// Copy the data into our buffer
for (unsigned i = 0; i < remainder; ++i)
dst[i] = ((data >> i*8) & 0xFF);
if (log && ProcessPOSIXLog::AtTopNestLevel() &&
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) ||
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) &&
size <= POSIX_LOG_MEMORY_SHORT_BYTES)))
{
uintptr_t print_dst = 0;
// Format bytes from data by moving into print_dst for log output
for (unsigned i = 0; i < remainder; ++i)
print_dst |= (((data >> i*8) & 0xFF) << i*8);
log->Printf ("NativeProcessLinux::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__,
(void*)vm_addr, print_dst, (unsigned long)data);
}
vm_addr += word_size;
dst += word_size;
}
if (log)
ProcessPOSIXLog::DecNestLevel();
return Error();
}
Error
DoWriteMemory(
lldb::pid_t pid,
lldb::addr_t vm_addr,
const void *buf,
size_t size,
size_t &bytes_written)
{
// ptrace word size is determined by the host, not the child
static const unsigned word_size = sizeof(void*);
const unsigned char *src = static_cast<const unsigned char*>(buf);
size_t remainder;
Error error;
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_ALL));
if (log)
ProcessPOSIXLog::IncNestLevel();
if (log && ProcessPOSIXLog::AtTopNestLevel() && log->GetMask().Test(POSIX_LOG_MEMORY))
log->Printf ("NativeProcessLinux::%s(%" PRIu64 ", %u, %p, %p, %" PRIu64 ")", __FUNCTION__,
pid, word_size, (void*)vm_addr, buf, size);
for (bytes_written = 0; bytes_written < size; bytes_written += remainder)
{
remainder = size - bytes_written;
remainder = remainder > word_size ? word_size : remainder;
if (remainder == word_size)
{
unsigned long data = 0;
assert(sizeof(data) >= word_size);
for (unsigned i = 0; i < word_size; ++i)
data |= (unsigned long)src[i] << i*8;
if (log && ProcessPOSIXLog::AtTopNestLevel() &&
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) ||
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) &&
size <= POSIX_LOG_MEMORY_SHORT_BYTES)))
log->Printf ("NativeProcessLinux::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__,
(void*)vm_addr, *(const unsigned long*)src, data);
error = NativeProcessLinux::PtraceWrapper(PTRACE_POKEDATA, pid, (void*)vm_addr, (void*)data);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
}
else
{
unsigned char buff[8];
size_t bytes_read;
error = DoReadMemory(pid, vm_addr, buff, word_size, bytes_read);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
memcpy(buff, src, remainder);
size_t bytes_written_rec;
error = DoWriteMemory(pid, vm_addr, buff, word_size, bytes_written_rec);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
if (log && ProcessPOSIXLog::AtTopNestLevel() &&
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) ||
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) &&
size <= POSIX_LOG_MEMORY_SHORT_BYTES)))
log->Printf ("NativeProcessLinux::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__,
(void*)vm_addr, *(const unsigned long*)src, *(unsigned long*)buff);
}
vm_addr += word_size;
src += word_size;
}
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
} // end of anonymous namespace
// Simple helper function to ensure flags are enabled on the given file
@@ -239,6 +389,406 @@ EnsureFDFlags(int fd, int flags)
return error;
}
// This class encapsulates the privileged thread which performs all ptrace and wait operations on
// the inferior. The thread consists of a main loop which waits for events and processes them
// - SIGCHLD (delivered over a signalfd file descriptor): These signals notify us of events in
// the inferior process. Upon receiving this signal we do a waitpid to get more information
// and dispatch to NativeProcessLinux::MonitorCallback.
// - requests for ptrace operations: These initiated via the DoOperation method, which funnels
// them to the Monitor thread via m_operation member. The Monitor thread is signaled over a
// pipe, and the completion of the operation is signalled over the semaphore.
// - thread exit event: this is signaled from the Monitor destructor by closing the write end
// of the command pipe.
class NativeProcessLinux::Monitor
{
private:
// The initial monitor operation (launch or attach). It returns a inferior process id.
std::unique_ptr<InitialOperation> m_initial_operation_up;
::pid_t m_child_pid = -1;
NativeProcessLinux * m_native_process;
enum { READ, WRITE };
int m_pipefd[2] = {-1, -1};
int m_signal_fd = -1;
HostThread m_thread;
// current operation which must be executed on the priviliged thread
Mutex m_operation_mutex;
const Operation *m_operation = nullptr;
sem_t m_operation_sem;
Error m_operation_error;
unsigned m_operation_nesting_level = 0;
static constexpr char operation_command = 'o';
static constexpr char begin_block_command = '{';
static constexpr char end_block_command = '}';
void
HandleSignals();
void
HandleWait();
// Returns true if the thread should exit.
bool
HandleCommands();
void
MainLoop();
static void *
RunMonitor(void *arg);
Error
WaitForAck();
void
BeginOperationBlock()
{
write(m_pipefd[WRITE], &begin_block_command, sizeof operation_command);
WaitForAck();
}
void
EndOperationBlock()
{
write(m_pipefd[WRITE], &end_block_command, sizeof operation_command);
WaitForAck();
}
public:
Monitor(const InitialOperation &initial_operation,
NativeProcessLinux *native_process)
: m_initial_operation_up(new InitialOperation(initial_operation)),
m_native_process(native_process)
{
sem_init(&m_operation_sem, 0, 0);
}
~Monitor();
Error
Initialize();
void
Terminate();
Error
DoOperation(const Operation &op);
class ScopedOperationLock {
Monitor &m_monitor;
public:
ScopedOperationLock(Monitor &monitor)
: m_monitor(monitor)
{ m_monitor.BeginOperationBlock(); }
~ScopedOperationLock()
{ m_monitor.EndOperationBlock(); }
};
};
constexpr char NativeProcessLinux::Monitor::operation_command;
constexpr char NativeProcessLinux::Monitor::begin_block_command;
constexpr char NativeProcessLinux::Monitor::end_block_command;
Error
NativeProcessLinux::Monitor::Initialize()
{
Error error;
// We get a SIGCHLD every time something interesting happens with the inferior. We shall be
// listening for these signals over a signalfd file descriptors. This allows us to wait for
// multiple kinds of events with select.
sigset_t signals;
sigemptyset(&signals);
sigaddset(&signals, SIGCHLD);
m_signal_fd = signalfd(-1, &signals, SFD_NONBLOCK | SFD_CLOEXEC);
if (m_signal_fd < 0)
{
return Error("NativeProcessLinux::Monitor::%s failed due to signalfd failure. Monitoring the inferior will be impossible: %s",
__FUNCTION__, strerror(errno));
}
if (pipe2(m_pipefd, O_CLOEXEC) == -1)
{
error.SetErrorToErrno();
return error;
}
if ((error = EnsureFDFlags(m_pipefd[READ], O_NONBLOCK)).Fail()) {
return error;
}
static const char g_thread_name[] = "lldb.process.nativelinux.monitor";
m_thread = ThreadLauncher::LaunchThread(g_thread_name, Monitor::RunMonitor, this, nullptr);
if (!m_thread.IsJoinable())
return Error("Failed to create monitor thread for NativeProcessLinux.");
// Wait for initial operation to complete.
return WaitForAck();
}
Error
NativeProcessLinux::Monitor::DoOperation(const Operation &op)
{
if (m_thread.EqualsThread(pthread_self())) {
// If we're on the Monitor thread, we can simply execute the operation.
return op();
}
// Otherwise we need to pass the operation to the Monitor thread so it can handle it.
Mutex::Locker lock(m_operation_mutex);
m_operation = &op;
// notify the thread that an operation is ready to be processed
write(m_pipefd[WRITE], &operation_command, sizeof operation_command);
return WaitForAck();
}
void
NativeProcessLinux::Monitor::Terminate()
{
if (m_pipefd[WRITE] >= 0)
{
close(m_pipefd[WRITE]);
m_pipefd[WRITE] = -1;
}
if (m_thread.IsJoinable())
m_thread.Join(nullptr);
}
NativeProcessLinux::Monitor::~Monitor()
{
Terminate();
if (m_pipefd[READ] >= 0)
close(m_pipefd[READ]);
if (m_signal_fd >= 0)
close(m_signal_fd);
sem_destroy(&m_operation_sem);
}
void
NativeProcessLinux::Monitor::HandleSignals()
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
// We don't really care about the content of the SIGCHLD siginfo structure, as we will get
// all the information from waitpid(). We just need to read all the signals so that we can
// sleep next time we reach select().
while (true)
{
signalfd_siginfo info;
ssize_t size = read(m_signal_fd, &info, sizeof info);
if (size == -1)
{
if (errno == EAGAIN || errno == EWOULDBLOCK)
break; // We are done.
if (errno == EINTR)
continue;
if (log)
log->Printf("NativeProcessLinux::Monitor::%s reading from signalfd file descriptor failed: %s",
__FUNCTION__, strerror(errno));
break;
}
if (size != sizeof info)
{
// We got incomplete information structure. This should not happen, let's just log
// that.
if (log)
log->Printf("NativeProcessLinux::Monitor::%s reading from signalfd file descriptor returned incomplete data: "
"structure size is %zd, read returned %zd bytes",
__FUNCTION__, sizeof info, size);
break;
}
if (log)
log->Printf("NativeProcessLinux::Monitor::%s received signal %s(%d).", __FUNCTION__,
Host::GetSignalAsCString(info.ssi_signo), info.ssi_signo);
}
}
void
NativeProcessLinux::Monitor::HandleWait()
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
// Process all pending waitpid notifications.
while (true)
{
int status = -1;
::pid_t wait_pid = waitpid(-1, &status, __WALL | __WNOTHREAD | WNOHANG);
if (wait_pid == 0)
break; // We are done.
if (wait_pid == -1)
{
if (errno == EINTR)
continue;
if (log)
log->Printf("NativeProcessLinux::Monitor::%s waitpid (-1, &status, __WALL | __WNOTHREAD | WNOHANG) failed: %s",
__FUNCTION__, strerror(errno));
break;
}
bool exited = false;
int signal = 0;
int exit_status = 0;
const char *status_cstr = NULL;
if (WIFSTOPPED(status))
{
signal = WSTOPSIG(status);
status_cstr = "STOPPED";
}
else if (WIFEXITED(status))
{
exit_status = WEXITSTATUS(status);
status_cstr = "EXITED";
exited = true;
}
else if (WIFSIGNALED(status))
{
signal = WTERMSIG(status);
status_cstr = "SIGNALED";
if (wait_pid == m_child_pid) {
exited = true;
exit_status = -1;
}
}
else
status_cstr = "(\?\?\?)";
if (log)
log->Printf("NativeProcessLinux::Monitor::%s: waitpid (-1, &status, __WALL | __WNOTHREAD | WNOHANG)"
"=> pid = %" PRIi32 ", status = 0x%8.8x (%s), signal = %i, exit_state = %i",
__FUNCTION__, wait_pid, status, status_cstr, signal, exit_status);
m_native_process->MonitorCallback (wait_pid, exited, signal, exit_status);
}
}
bool
NativeProcessLinux::Monitor::HandleCommands()
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
while (true)
{
char command = 0;
ssize_t size = read(m_pipefd[READ], &command, sizeof command);
if (size == -1)
{
if (errno == EAGAIN || errno == EWOULDBLOCK)
return false;
if (errno == EINTR)
continue;
if (log)
log->Printf("NativeProcessLinux::Monitor::%s exiting because read from command file descriptor failed: %s", __FUNCTION__, strerror(errno));
return true;
}
if (size == 0) // end of file - write end closed
{
if (log)
log->Printf("NativeProcessLinux::Monitor::%s exit command received, exiting...", __FUNCTION__);
assert(m_operation_nesting_level == 0 && "Unbalanced begin/end block commands detected");
return true; // We are done.
}
switch (command)
{
case operation_command:
m_operation_error = (*m_operation)();
break;
case begin_block_command:
++m_operation_nesting_level;
break;
case end_block_command:
assert(m_operation_nesting_level > 0);
--m_operation_nesting_level;
break;
default:
if (log)
log->Printf("NativeProcessLinux::Monitor::%s received unknown command '%c'",
__FUNCTION__, command);
}
// notify calling thread that the command has been processed
sem_post(&m_operation_sem);
}
}
void
NativeProcessLinux::Monitor::MainLoop()
{
::pid_t child_pid = (*m_initial_operation_up)(m_operation_error);
m_initial_operation_up.reset();
m_child_pid = child_pid;
sem_post(&m_operation_sem);
while (true)
{
fd_set fds;
FD_ZERO(&fds);
// Only process waitpid events if we are outside of an operation block. Any pending
// events will be processed after we leave the block.
if (m_operation_nesting_level == 0)
FD_SET(m_signal_fd, &fds);
FD_SET(m_pipefd[READ], &fds);
int max_fd = std::max(m_signal_fd, m_pipefd[READ]) + 1;
int r = select(max_fd, &fds, nullptr, nullptr, nullptr);
if (r < 0)
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
if (log)
log->Printf("NativeProcessLinux::Monitor::%s exiting because select failed: %s",
__FUNCTION__, strerror(errno));
return;
}
if (FD_ISSET(m_pipefd[READ], &fds))
{
if (HandleCommands())
return;
}
if (FD_ISSET(m_signal_fd, &fds))
{
HandleSignals();
HandleWait();
}
}
}
Error
NativeProcessLinux::Monitor::WaitForAck()
{
Error error;
while (sem_wait(&m_operation_sem) != 0)
{
if (errno == EINTR)
continue;
error.SetErrorToErrno();
return error;
}
return m_operation_error;
}
void *
NativeProcessLinux::Monitor::RunMonitor(void *arg)
{
static_cast<Monitor *>(arg)->MainLoop();
return nullptr;
}
NativeProcessLinux::LaunchArgs::LaunchArgs(Module *module,
char const **argv,
char const **envp,
@@ -269,7 +819,6 @@ Error
NativeProcessProtocol::Launch (
ProcessLaunchInfo &launch_info,
NativeProcessProtocol::NativeDelegate &native_delegate,
MainLoop &mainloop,
NativeProcessProtocolSP &native_process_sp)
{
Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
@@ -356,7 +905,6 @@ NativeProcessProtocol::Launch (
}
std::static_pointer_cast<NativeProcessLinux> (native_process_sp)->LaunchInferior (
mainloop,
exe_module_sp.get(),
launch_info.GetArguments ().GetConstArgumentVector (),
launch_info.GetEnvironmentEntries ().GetConstArgumentVector (),
@@ -384,7 +932,6 @@ Error
NativeProcessProtocol::Attach (
lldb::pid_t pid,
NativeProcessProtocol::NativeDelegate &native_delegate,
MainLoop &mainloop,
NativeProcessProtocolSP &native_process_sp)
{
Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
@@ -411,7 +958,7 @@ NativeProcessProtocol::Attach (
return error;
}
native_process_linux_sp->AttachToInferior (mainloop, pid, error);
native_process_linux_sp->AttachToInferior (pid, error);
if (!error.Success ())
return error;
@@ -432,9 +979,12 @@ NativeProcessLinux::NativeProcessLinux () :
{
}
//------------------------------------------------------------------------------
// NativeProcessLinux spawns a new thread which performs all operations on the inferior process.
// Refer to Monitor and Operation classes to see why this is necessary.
//------------------------------------------------------------------------------
void
NativeProcessLinux::LaunchInferior (
MainLoop &mainloop,
Module *module,
const char *argv[],
const char *envp[],
@@ -445,11 +995,6 @@ NativeProcessLinux::LaunchInferior (
const ProcessLaunchInfo &launch_info,
Error &error)
{
m_sigchld_handle = mainloop.RegisterSignal(SIGCHLD,
[this] (MainLoopBase &) { SigchldHandler(); }, error);
if (! m_sigchld_handle)
return;
if (module)
m_arch = module->GetArchitecture ();
@@ -463,21 +1008,18 @@ NativeProcessLinux::LaunchInferior (
working_dir,
launch_info));
Launch(args.get(), error);
StartMonitorThread ([&] (Error &e) { return Launch(args.get(), e); }, error);
if (!error.Success ())
return;
}
void
NativeProcessLinux::AttachToInferior (MainLoop &mainloop, lldb::pid_t pid, Error &error)
NativeProcessLinux::AttachToInferior (lldb::pid_t pid, Error &error)
{
Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
if (log)
log->Printf ("NativeProcessLinux::%s (pid = %" PRIi64 ")", __FUNCTION__, pid);
m_sigchld_handle = mainloop.RegisterSignal(SIGCHLD,
[this] (MainLoopBase &) { SigchldHandler(); }, error);
if (! m_sigchld_handle)
return;
// We can use the Host for everything except the ResolveExecutable portion.
PlatformSP platform_sp = Platform::GetHostPlatform ();
if (!platform_sp)
@@ -515,7 +1057,15 @@ NativeProcessLinux::AttachToInferior (MainLoop &mainloop, lldb::pid_t pid, Error
m_pid = pid;
SetState(eStateAttaching);
Attach(pid, error);
StartMonitorThread ([=] (Error &e) { return Attach(pid, e); }, error);
if (!error.Success ())
return;
}
void
NativeProcessLinux::Terminate ()
{
m_monitor_up->Terminate();
}
::pid_t
@@ -1737,6 +2287,7 @@ NativeProcessLinux::Resume (const ResumeActionList &resume_actions)
bool software_single_step = !SupportHardwareSingleStepping();
Monitor::ScopedOperationLock monitor_lock(*m_monitor_up);
Mutex::Locker locker (m_threads_mutex);
if (software_single_step)
@@ -1856,7 +2407,7 @@ NativeProcessLinux::Detach ()
error = Detach (GetID ());
// Stop monitoring the inferior.
m_sigchld_handle.reset();
m_monitor_up->Terminate();
// No error.
return error;
@@ -1891,6 +2442,7 @@ NativeProcessLinux::Interrupt ()
if (log)
log->Printf ("NativeProcessLinux::%s selecting running thread for interrupt target", __FUNCTION__);
Monitor::ScopedOperationLock monitor_lock(*m_monitor_up);
Mutex::Locker locker (m_threads_mutex);
for (auto thread_sp : m_threads)
@@ -2545,6 +3097,24 @@ NativeProcessLinux::GetCrashReasonForSIGBUS(const siginfo_t *info)
}
#endif
Error
NativeProcessLinux::SetWatchpoint (lldb::addr_t addr, size_t size, uint32_t watch_flags, bool hardware)
{
// The base SetWatchpoint will end up executing monitor operations. Let's lock the monitor
// for it.
Monitor::ScopedOperationLock monitor_lock(*m_monitor_up);
return NativeProcessProtocol::SetWatchpoint(addr, size, watch_flags, hardware);
}
Error
NativeProcessLinux::RemoveWatchpoint (lldb::addr_t addr)
{
// The base RemoveWatchpoint will end up executing monitor operations. Let's lock the monitor
// for it.
Monitor::ScopedOperationLock monitor_lock(*m_monitor_up);
return NativeProcessProtocol::RemoveWatchpoint(addr);
}
Error
NativeProcessLinux::ReadMemory (lldb::addr_t addr, void *buf, size_t size, size_t &bytes_read)
{
@@ -2574,52 +3144,7 @@ NativeProcessLinux::ReadMemory (lldb::addr_t addr, void *buf, size_t size, size_
// the call failed for some reason, let's retry the read using ptrace api.
}
unsigned char *dst = static_cast<unsigned char*>(buf);
size_t remainder;
long data;
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_ALL));
if (log)
ProcessPOSIXLog::IncNestLevel();
if (log && ProcessPOSIXLog::AtTopNestLevel() && log->GetMask().Test(POSIX_LOG_MEMORY))
log->Printf ("NativeProcessLinux::%s(%p, %p, %zd, _)", __FUNCTION__, (void*)addr, buf, size);
for (bytes_read = 0; bytes_read < size; bytes_read += remainder)
{
Error error = NativeProcessLinux::PtraceWrapper(PTRACE_PEEKDATA, GetID(), (void*)addr, nullptr, 0, &data);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
remainder = size - bytes_read;
remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder;
// Copy the data into our buffer
for (unsigned i = 0; i < remainder; ++i)
dst[i] = ((data >> i*8) & 0xFF);
if (log && ProcessPOSIXLog::AtTopNestLevel() &&
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) ||
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) &&
size <= POSIX_LOG_MEMORY_SHORT_BYTES)))
{
uintptr_t print_dst = 0;
// Format bytes from data by moving into print_dst for log output
for (unsigned i = 0; i < remainder; ++i)
print_dst |= (((data >> i*8) & 0xFF) << i*8);
log->Printf ("NativeProcessLinux::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__,
(void*)addr, print_dst, (unsigned long)data);
}
addr += k_ptrace_word_size;
dst += k_ptrace_word_size;
}
if (log)
ProcessPOSIXLog::DecNestLevel();
return Error();
return DoOperation([&] { return DoReadMemory(GetID(), addr, buf, size, bytes_read); });
}
Error
@@ -2633,79 +3158,7 @@ NativeProcessLinux::ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf, size_t s
Error
NativeProcessLinux::WriteMemory(lldb::addr_t addr, const void *buf, size_t size, size_t &bytes_written)
{
const unsigned char *src = static_cast<const unsigned char*>(buf);
size_t remainder;
Error error;
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_ALL));
if (log)
ProcessPOSIXLog::IncNestLevel();
if (log && ProcessPOSIXLog::AtTopNestLevel() && log->GetMask().Test(POSIX_LOG_MEMORY))
log->Printf ("NativeProcessLinux::%s(%p, %p, %" PRIu64 ")", __FUNCTION__, (void*)addr, buf, size);
for (bytes_written = 0; bytes_written < size; bytes_written += remainder)
{
remainder = size - bytes_written;
remainder = remainder > k_ptrace_word_size ? k_ptrace_word_size : remainder;
if (remainder == k_ptrace_word_size)
{
unsigned long data = 0;
for (unsigned i = 0; i < k_ptrace_word_size; ++i)
data |= (unsigned long)src[i] << i*8;
if (log && ProcessPOSIXLog::AtTopNestLevel() &&
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) ||
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) &&
size <= POSIX_LOG_MEMORY_SHORT_BYTES)))
log->Printf ("NativeProcessLinux::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__,
(void*)addr, *(const unsigned long*)src, data);
error = NativeProcessLinux::PtraceWrapper(PTRACE_POKEDATA, GetID(), (void*)addr, (void*)data);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
}
else
{
unsigned char buff[8];
size_t bytes_read;
error = ReadMemory(addr, buff, k_ptrace_word_size, bytes_read);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
memcpy(buff, src, remainder);
size_t bytes_written_rec;
error = WriteMemory(addr, buff, k_ptrace_word_size, bytes_written_rec);
if (error.Fail())
{
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
}
if (log && ProcessPOSIXLog::AtTopNestLevel() &&
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) ||
(log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) &&
size <= POSIX_LOG_MEMORY_SHORT_BYTES)))
log->Printf ("NativeProcessLinux::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__,
(void*)addr, *(const unsigned long*)src, *(unsigned long*)buff);
}
addr += k_ptrace_word_size;
src += k_ptrace_word_size;
}
if (log)
ProcessPOSIXLog::DecNestLevel();
return error;
return DoOperation([&] { return DoWriteMemory(GetID(), addr, buf, size, bytes_written); });
}
Error
@@ -2724,7 +3177,7 @@ NativeProcessLinux::Resume (lldb::tid_t tid, uint32_t signo)
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
data = signo;
Error error = PtraceWrapper(PTRACE_CONT, tid, nullptr, (void*)data);
Error error = DoOperation([&] { return PtraceWrapper(PTRACE_CONT, tid, nullptr, (void*)data); });
if (log)
log->Printf ("NativeProcessLinux::%s() resuming thread = %" PRIu64 " result = %s", __FUNCTION__, tid, error.Success() ? "true" : "false");
@@ -2739,19 +3192,19 @@ NativeProcessLinux::SingleStep(lldb::tid_t tid, uint32_t signo)
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
data = signo;
return PtraceWrapper(PTRACE_SINGLESTEP, tid, nullptr, (void*)data);
return DoOperation([&] { return PtraceWrapper(PTRACE_SINGLESTEP, tid, nullptr, (void*)data); });
}
Error
NativeProcessLinux::GetSignalInfo(lldb::tid_t tid, void *siginfo)
{
return PtraceWrapper(PTRACE_GETSIGINFO, tid, nullptr, siginfo);
return DoOperation([&] { return PtraceWrapper(PTRACE_GETSIGINFO, tid, nullptr, siginfo); });
}
Error
NativeProcessLinux::GetEventMessage(lldb::tid_t tid, unsigned long *message)
{
return PtraceWrapper(PTRACE_GETEVENTMSG, tid, nullptr, message);
return DoOperation([&] { return PtraceWrapper(PTRACE_GETEVENTMSG, tid, nullptr, message); });
}
Error
@@ -2760,7 +3213,7 @@ NativeProcessLinux::Detach(lldb::tid_t tid)
if (tid == LLDB_INVALID_THREAD_ID)
return Error();
return PtraceWrapper(PTRACE_DETACH, tid);
return DoOperation([&] { return PtraceWrapper(PTRACE_DETACH, tid); });
}
bool
@@ -2777,6 +3230,16 @@ NativeProcessLinux::DupDescriptor(const FileSpec &file_spec, int fd, int flags)
return (close(target_fd) == -1) ? false : true;
}
void
NativeProcessLinux::StartMonitorThread(const InitialOperation &initial_operation, Error &error)
{
m_monitor_up.reset(new Monitor(initial_operation, this));
error = m_monitor_up->Initialize();
if (error.Fail()) {
m_monitor_up.reset();
}
}
bool
NativeProcessLinux::HasThreadNoLock (lldb::tid_t thread_id)
{
@@ -3245,65 +3708,10 @@ NativeProcessLinux::ThreadWasCreated (lldb::tid_t tid)
}
}
void
NativeProcessLinux::SigchldHandler()
Error
NativeProcessLinux::DoOperation(const Operation &op)
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
// Process all pending waitpid notifications.
while (true)
{
int status = -1;
::pid_t wait_pid = waitpid(-1, &status, __WALL | __WNOTHREAD | WNOHANG);
if (wait_pid == 0)
break; // We are done.
if (wait_pid == -1)
{
if (errno == EINTR)
continue;
Error error(errno, eErrorTypePOSIX);
if (log)
log->Printf("NativeProcessLinux::%s waitpid (-1, &status, __WALL | __WNOTHREAD | WNOHANG) failed: %s",
__FUNCTION__, error.AsCString());
break;
}
bool exited = false;
int signal = 0;
int exit_status = 0;
const char *status_cstr = nullptr;
if (WIFSTOPPED(status))
{
signal = WSTOPSIG(status);
status_cstr = "STOPPED";
}
else if (WIFEXITED(status))
{
exit_status = WEXITSTATUS(status);
status_cstr = "EXITED";
exited = true;
}
else if (WIFSIGNALED(status))
{
signal = WTERMSIG(status);
status_cstr = "SIGNALED";
if (wait_pid == static_cast<::pid_t>(GetID())) {
exited = true;
exit_status = -1;
}
}
else
status_cstr = "(\?\?\?)";
if (log)
log->Printf("NativeProcessLinux::%s: waitpid (-1, &status, __WALL | __WNOTHREAD | WNOHANG)"
"=> pid = %" PRIi32 ", status = 0x%8.8x (%s), signal = %i, exit_state = %i",
__FUNCTION__, wait_pid, status, status_cstr, signal, exit_status);
MonitorCallback (wait_pid, exited, signal, exit_status);
}
return m_monitor_up->DoOperation(op);
}
// Wrapper for ptrace to catch errors and log calls.