llvm-project/lldb/source/Target/UnixSignals.cpp

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//===-- UnixSignals.cpp -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Target/UnixSignals.h"
#include "lldb/Core/ArchSpec.h"
#include "lldb/Host/StringConvert.h"
#include "Plugins/Process/Utility/FreeBSDSignals.h"
#include "Plugins/Process/Utility/LinuxSignals.h"
#include "Plugins/Process/Utility/MipsLinuxSignals.h"
#include "Plugins/Process/Utility/NetBSDSignals.h"
using namespace lldb_private;
UnixSignals::Signal::Signal(const char *name,
bool default_suppress,
bool default_stop,
bool default_notify,
const char *description,
const char *alias) :
m_name (name),
m_alias (alias),
m_description (),
m_suppress (default_suppress),
m_stop (default_stop),
m_notify (default_notify)
{
if (description)
m_description.assign (description);
}
lldb::UnixSignalsSP
UnixSignals::Create(const ArchSpec &arch)
{
const auto &triple = arch.GetTriple();
switch (triple.getOS())
{
case llvm::Triple::Linux:
{
switch (triple.getArch())
{
case llvm::Triple::mips:
case llvm::Triple::mipsel:
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
return std::make_shared<MipsLinuxSignals>();
default:
return std::make_shared<LinuxSignals>();
}
}
case llvm::Triple::FreeBSD:
case llvm::Triple::OpenBSD:
return std::make_shared<FreeBSDSignals>();
case llvm::Triple::NetBSD:
return std::make_shared<NetBSDSignals>();
default:
return std::make_shared<UnixSignals>();
}
}
//----------------------------------------------------------------------
// UnixSignals constructor
//----------------------------------------------------------------------
UnixSignals::UnixSignals ()
{
Reset ();
}
UnixSignals::UnixSignals(const UnixSignals &rhs)
: m_signals(rhs.m_signals)
{
}
UnixSignals::~UnixSignals() = default;
void
UnixSignals::Reset ()
{
// This builds one standard set of Unix Signals. If yours aren't quite in this
// order, you can either subclass this class, and use Add & Remove to change them
// or you can subclass and build them afresh in your constructor;
[NFC] Darwin llgs support from Week of Code This code represents the Week of Code work I did on bringing up lldb-server LLGS support for Darwin. It does not include the Xcode project changes needed, as we don't want to throw that switch until more support is implemented (i.e. this change is inert, no build systems use it yet. I've verified on Ubuntu 16.04, macOS Xcode and macOS cmake builds). This change does some minimal refactoring of code that is shared with the Linux LLGS portion, moving it from NativeProcessLinux into NativeProcessProtocol. That code is also used by NativeProcessDarwin. Current state on Darwin: * Process launching is implemented. (Attach is not). Launching on devices has not yet been tested (FBS/BKS might need a bit of work). * Inferior waitpid monitoring and communication of exit status via MainLoop callback is implemented. * Memory read/write, breakpoints, thread register context, etc. are not yet implemented. This impacts process stop/resume, as the initial launch suspended immediately starts the process up and running because it doesn't know it is supposed to remain stopped. * I implemented the equivalent of MachThreadList as NativeThreadListDarwin, in anticipation that we might want to factor out common parts into NativeThreadList{Protocol} and share some code here. After writing it, though, the fallout from merging Mach Task/Process into a single concept plus some other minor changes makes the whole NativeThreadListDarwin concept nothing more than dead weight. I am likely going to get rid of this class and just manage it directly in NativeProcessDarwin, much like I did for NativeProcessLinux. * There is a stub-out call for starting a STDIO thread. That will go away and adopt the MainLoop pselect-based IOObject reading. I am developing the fully-integrated changes in the following repo, which contains the necessary Xcode bits and the glue that enables lldb-debugserver on a macOS system: https://github.com/tfiala/lldb/tree/llgs-darwin This change also breaks out a few of the lldb-server tests into their own directory, and adds some $qHostInfo tests (not sure why I didn't write those tests back when I initially implemented that on the Linux side). llvm-svn: 280604
2016-09-04 08:18:56 +08:00
//
// Note: the signals below are the Darwin signals. Do not change these!
m_signals.clear();
// SIGNO NAME SUPPRESS STOP NOTIFY DESCRIPTION
// ====== ============ ======== ====== ====== ===================================================
AddSignal (1, "SIGHUP", false, true , true , "hangup");
AddSignal (2, "SIGINT", true , true , true , "interrupt");
AddSignal (3, "SIGQUIT", false, true , true , "quit");
AddSignal (4, "SIGILL", false, true , true , "illegal instruction");
AddSignal (5, "SIGTRAP", true , true , true , "trace trap (not reset when caught)");
AddSignal (6, "SIGABRT", false, true , true , "abort()");
AddSignal (7, "SIGEMT", false, true , true , "pollable event");
AddSignal (8, "SIGFPE", false, true , true , "floating point exception");
AddSignal (9, "SIGKILL", false, true , true , "kill");
AddSignal (10, "SIGBUS", false, true , true , "bus error");
AddSignal (11, "SIGSEGV", false, true , true , "segmentation violation");
AddSignal (12, "SIGSYS", false, true , true , "bad argument to system call");
AddSignal (13, "SIGPIPE", false, true , true , "write on a pipe with no one to read it");
AddSignal (14, "SIGALRM", false, false, false, "alarm clock");
AddSignal (15, "SIGTERM", false, true , true , "software termination signal from kill");
AddSignal (16, "SIGURG", false, false, false, "urgent condition on IO channel");
AddSignal (17, "SIGSTOP", true , true , true , "sendable stop signal not from tty");
AddSignal (18, "SIGTSTP", false, true , true , "stop signal from tty");
AddSignal (19, "SIGCONT", false, true , true , "continue a stopped process");
AddSignal (20, "SIGCHLD", false, false, false, "to parent on child stop or exit");
AddSignal (21, "SIGTTIN", false, true , true , "to readers process group upon background tty read");
AddSignal (22, "SIGTTOU", false, true , true , "to readers process group upon background tty write");
AddSignal (23, "SIGIO", false, false, false, "input/output possible signal");
AddSignal (24, "SIGXCPU", false, true , true , "exceeded CPU time limit");
AddSignal (25, "SIGXFSZ", false, true , true , "exceeded file size limit");
AddSignal (26, "SIGVTALRM", false, false, false, "virtual time alarm");
AddSignal (27, "SIGPROF", false, false, false, "profiling time alarm");
AddSignal (28, "SIGWINCH", false, false, false, "window size changes");
AddSignal (29, "SIGINFO", false, true , true , "information request");
AddSignal (30, "SIGUSR1", false, true , true , "user defined signal 1");
AddSignal (31, "SIGUSR2", false, true , true , "user defined signal 2");
}
void
UnixSignals::AddSignal(int signo,
const char *name,
bool default_suppress,
bool default_stop,
bool default_notify,
const char *description,
const char *alias)
{
Signal new_signal (name, default_suppress, default_stop, default_notify, description, alias);
m_signals.insert (std::make_pair(signo, new_signal));
}
void
UnixSignals::RemoveSignal (int signo)
{
collection::iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
m_signals.erase (pos);
}
const char *
UnixSignals::GetSignalAsCString (int signo) const
{
collection::const_iterator pos = m_signals.find (signo);
if (pos == m_signals.end())
return nullptr;
else
return pos->second.m_name.GetCString ();
}
bool
UnixSignals::SignalIsValid (int32_t signo) const
{
return m_signals.find (signo) != m_signals.end();
}
ConstString
UnixSignals::GetShortName(ConstString name) const
{
if (name)
{
const char* signame = name.AsCString();
return ConstString(signame + 3); // Remove "SIG" from name
}
return name;
}
int32_t
UnixSignals::GetSignalNumberFromName (const char *name) const
{
ConstString const_name (name);
collection::const_iterator pos, end = m_signals.end ();
for (pos = m_signals.begin (); pos != end; pos++)
{
if ((const_name == pos->second.m_name) || (const_name == pos->second.m_alias) ||
(const_name == GetShortName(pos->second.m_name)) || (const_name == GetShortName(pos->second.m_alias)))
return pos->first;
}
const int32_t signo = StringConvert::ToSInt32(name, LLDB_INVALID_SIGNAL_NUMBER, 0);
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
return signo;
return LLDB_INVALID_SIGNAL_NUMBER;
}
int32_t
UnixSignals::GetFirstSignalNumber () const
{
if (m_signals.empty())
return LLDB_INVALID_SIGNAL_NUMBER;
return (*m_signals.begin ()).first;
}
int32_t
UnixSignals::GetNextSignalNumber (int32_t current_signal) const
{
collection::const_iterator pos = m_signals.find (current_signal);
collection::const_iterator end = m_signals.end();
if (pos == end)
return LLDB_INVALID_SIGNAL_NUMBER;
else
{
pos++;
if (pos == end)
return LLDB_INVALID_SIGNAL_NUMBER;
else
return pos->first;
}
}
const char *
UnixSignals::GetSignalInfo(int32_t signo,
bool &should_suppress,
bool &should_stop,
bool &should_notify) const
{
collection::const_iterator pos = m_signals.find (signo);
if (pos == m_signals.end())
return nullptr;
else
{
const Signal &signal = pos->second;
should_suppress = signal.m_suppress;
should_stop = signal.m_stop;
should_notify = signal.m_notify;
return signal.m_name.AsCString("");
}
}
bool
UnixSignals::GetShouldSuppress (int signo) const
{
collection::const_iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
return pos->second.m_suppress;
return false;
}
bool
UnixSignals::SetShouldSuppress (int signo, bool value)
{
collection::iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
{
pos->second.m_suppress = value;
return true;
}
return false;
}
bool
UnixSignals::SetShouldSuppress (const char *signal_name, bool value)
{
const int32_t signo = GetSignalNumberFromName (signal_name);
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
return SetShouldSuppress (signo, value);
return false;
}
bool
UnixSignals::GetShouldStop (int signo) const
{
collection::const_iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
return pos->second.m_stop;
return false;
}
bool
UnixSignals::SetShouldStop (int signo, bool value)
{
collection::iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
{
pos->second.m_stop = value;
return true;
}
return false;
}
bool
UnixSignals::SetShouldStop (const char *signal_name, bool value)
{
const int32_t signo = GetSignalNumberFromName (signal_name);
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
return SetShouldStop (signo, value);
return false;
}
bool
UnixSignals::GetShouldNotify (int signo) const
{
collection::const_iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
return pos->second.m_notify;
return false;
}
bool
UnixSignals::SetShouldNotify (int signo, bool value)
{
collection::iterator pos = m_signals.find (signo);
if (pos != m_signals.end())
{
pos->second.m_notify = value;
return true;
}
return false;
}
bool
UnixSignals::SetShouldNotify (const char *signal_name, bool value)
{
const int32_t signo = GetSignalNumberFromName (signal_name);
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
return SetShouldNotify (signo, value);
return false;
}
int32_t
UnixSignals::GetNumSignals() const
{
return m_signals.size();
}
int32_t
UnixSignals::GetSignalAtIndex(int32_t index) const
{
if (index < 0 || m_signals.size() <= static_cast<size_t>(index))
return LLDB_INVALID_SIGNAL_NUMBER;
auto it = m_signals.begin();
std::advance(it, index);
return it->first;
}