mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-15 07:59:50 +00:00
1d5c214e84
Move CallBacksToRun into the common Signals.cpp, create RunCallBacksToRun() and use these in both Unix/Signals.inc and Windows/Signals.inc. Lots of potential code to be merged here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242925 91177308-0d34-0410-b5e6-96231b3b80d8
544 lines
18 KiB
C++
544 lines
18 KiB
C++
//===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines some helpful functions for dealing with the possibility of
|
|
// Unix signals occurring while your program is running.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "Unix.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/Support/Format.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/FileUtilities.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/Mutex.h"
|
|
#include "llvm/Support/Program.h"
|
|
#include "llvm/Support/UniqueLock.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include <algorithm>
|
|
#include <string>
|
|
#if HAVE_EXECINFO_H
|
|
# include <execinfo.h> // For backtrace().
|
|
#endif
|
|
#if HAVE_SIGNAL_H
|
|
#include <signal.h>
|
|
#endif
|
|
#if HAVE_SYS_STAT_H
|
|
#include <sys/stat.h>
|
|
#endif
|
|
#if HAVE_CXXABI_H
|
|
#include <cxxabi.h>
|
|
#endif
|
|
#if HAVE_DLFCN_H
|
|
#include <dlfcn.h>
|
|
#endif
|
|
#if HAVE_MACH_MACH_H
|
|
#include <mach/mach.h>
|
|
#endif
|
|
#if HAVE_LINK_H
|
|
#include <link.h>
|
|
#endif
|
|
|
|
using namespace llvm;
|
|
|
|
static RETSIGTYPE SignalHandler(int Sig); // defined below.
|
|
|
|
static ManagedStatic<SmartMutex<true> > SignalsMutex;
|
|
|
|
/// InterruptFunction - The function to call if ctrl-c is pressed.
|
|
static void (*InterruptFunction)() = nullptr;
|
|
|
|
static ManagedStatic<std::vector<std::string>> FilesToRemove;
|
|
|
|
// IntSigs - Signals that represent requested termination. There's no bug
|
|
// or failure, or if there is, it's not our direct responsibility. For whatever
|
|
// reason, our continued execution is no longer desirable.
|
|
static const int IntSigs[] = {
|
|
SIGHUP, SIGINT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
|
|
};
|
|
|
|
// KillSigs - Signals that represent that we have a bug, and our prompt
|
|
// termination has been ordered.
|
|
static const int KillSigs[] = {
|
|
SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGQUIT
|
|
#ifdef SIGSYS
|
|
, SIGSYS
|
|
#endif
|
|
#ifdef SIGXCPU
|
|
, SIGXCPU
|
|
#endif
|
|
#ifdef SIGXFSZ
|
|
, SIGXFSZ
|
|
#endif
|
|
#ifdef SIGEMT
|
|
, SIGEMT
|
|
#endif
|
|
};
|
|
|
|
static unsigned NumRegisteredSignals = 0;
|
|
static struct {
|
|
struct sigaction SA;
|
|
int SigNo;
|
|
} RegisteredSignalInfo[(sizeof(IntSigs)+sizeof(KillSigs))/sizeof(KillSigs[0])];
|
|
|
|
|
|
static void RegisterHandler(int Signal) {
|
|
assert(NumRegisteredSignals <
|
|
sizeof(RegisteredSignalInfo)/sizeof(RegisteredSignalInfo[0]) &&
|
|
"Out of space for signal handlers!");
|
|
|
|
struct sigaction NewHandler;
|
|
|
|
NewHandler.sa_handler = SignalHandler;
|
|
NewHandler.sa_flags = SA_NODEFER|SA_RESETHAND;
|
|
sigemptyset(&NewHandler.sa_mask);
|
|
|
|
// Install the new handler, save the old one in RegisteredSignalInfo.
|
|
sigaction(Signal, &NewHandler,
|
|
&RegisteredSignalInfo[NumRegisteredSignals].SA);
|
|
RegisteredSignalInfo[NumRegisteredSignals].SigNo = Signal;
|
|
++NumRegisteredSignals;
|
|
}
|
|
|
|
static void RegisterHandlers() {
|
|
// We need to dereference the signals mutex during handler registration so
|
|
// that we force its construction. This is to prevent the first use being
|
|
// during handling an actual signal because you can't safely call new in a
|
|
// signal handler.
|
|
*SignalsMutex;
|
|
|
|
// If the handlers are already registered, we're done.
|
|
if (NumRegisteredSignals != 0) return;
|
|
|
|
for (auto S : IntSigs) RegisterHandler(S);
|
|
for (auto S : KillSigs) RegisterHandler(S);
|
|
}
|
|
|
|
static void UnregisterHandlers() {
|
|
// Restore all of the signal handlers to how they were before we showed up.
|
|
for (unsigned i = 0, e = NumRegisteredSignals; i != e; ++i)
|
|
sigaction(RegisteredSignalInfo[i].SigNo,
|
|
&RegisteredSignalInfo[i].SA, nullptr);
|
|
NumRegisteredSignals = 0;
|
|
}
|
|
|
|
|
|
/// RemoveFilesToRemove - Process the FilesToRemove list. This function
|
|
/// should be called with the SignalsMutex lock held.
|
|
/// NB: This must be an async signal safe function. It cannot allocate or free
|
|
/// memory, even in debug builds.
|
|
static void RemoveFilesToRemove() {
|
|
// Avoid constructing ManagedStatic in the signal handler.
|
|
// If FilesToRemove is not constructed, there are no files to remove.
|
|
if (!FilesToRemove.isConstructed())
|
|
return;
|
|
|
|
// We avoid iterators in case of debug iterators that allocate or release
|
|
// memory.
|
|
std::vector<std::string>& FilesToRemoveRef = *FilesToRemove;
|
|
for (unsigned i = 0, e = FilesToRemoveRef.size(); i != e; ++i) {
|
|
// We rely on a std::string implementation for which repeated calls to
|
|
// 'c_str()' don't allocate memory. We pre-call 'c_str()' on all of these
|
|
// strings to try to ensure this is safe.
|
|
const char *path = FilesToRemoveRef[i].c_str();
|
|
|
|
// Get the status so we can determine if it's a file or directory. If we
|
|
// can't stat the file, ignore it.
|
|
struct stat buf;
|
|
if (stat(path, &buf) != 0)
|
|
continue;
|
|
|
|
// If this is not a regular file, ignore it. We want to prevent removal of
|
|
// special files like /dev/null, even if the compiler is being run with the
|
|
// super-user permissions.
|
|
if (!S_ISREG(buf.st_mode))
|
|
continue;
|
|
|
|
// Otherwise, remove the file. We ignore any errors here as there is nothing
|
|
// else we can do.
|
|
unlink(path);
|
|
}
|
|
}
|
|
|
|
// SignalHandler - The signal handler that runs.
|
|
static RETSIGTYPE SignalHandler(int Sig) {
|
|
// Restore the signal behavior to default, so that the program actually
|
|
// crashes when we return and the signal reissues. This also ensures that if
|
|
// we crash in our signal handler that the program will terminate immediately
|
|
// instead of recursing in the signal handler.
|
|
UnregisterHandlers();
|
|
|
|
// Unmask all potentially blocked kill signals.
|
|
sigset_t SigMask;
|
|
sigfillset(&SigMask);
|
|
sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
|
|
|
|
{
|
|
unique_lock<SmartMutex<true>> Guard(*SignalsMutex);
|
|
RemoveFilesToRemove();
|
|
|
|
if (std::find(std::begin(IntSigs), std::end(IntSigs), Sig)
|
|
!= std::end(IntSigs)) {
|
|
if (InterruptFunction) {
|
|
void (*IF)() = InterruptFunction;
|
|
Guard.unlock();
|
|
InterruptFunction = nullptr;
|
|
IF(); // run the interrupt function.
|
|
return;
|
|
}
|
|
|
|
Guard.unlock();
|
|
raise(Sig); // Execute the default handler.
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Otherwise if it is a fault (like SEGV) run any handler.
|
|
RunCallBacksToRun();
|
|
|
|
#ifdef __s390__
|
|
// On S/390, certain signals are delivered with PSW Address pointing to
|
|
// *after* the faulting instruction. Simply returning from the signal
|
|
// handler would continue execution after that point, instead of
|
|
// re-raising the signal. Raise the signal manually in those cases.
|
|
if (Sig == SIGILL || Sig == SIGFPE || Sig == SIGTRAP)
|
|
raise(Sig);
|
|
#endif
|
|
}
|
|
|
|
void llvm::sys::RunInterruptHandlers() {
|
|
sys::SmartScopedLock<true> Guard(*SignalsMutex);
|
|
RemoveFilesToRemove();
|
|
}
|
|
|
|
void llvm::sys::SetInterruptFunction(void (*IF)()) {
|
|
{
|
|
sys::SmartScopedLock<true> Guard(*SignalsMutex);
|
|
InterruptFunction = IF;
|
|
}
|
|
RegisterHandlers();
|
|
}
|
|
|
|
// RemoveFileOnSignal - The public API
|
|
bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
|
|
std::string* ErrMsg) {
|
|
{
|
|
sys::SmartScopedLock<true> Guard(*SignalsMutex);
|
|
std::vector<std::string>& FilesToRemoveRef = *FilesToRemove;
|
|
std::string *OldPtr =
|
|
FilesToRemoveRef.empty() ? nullptr : &FilesToRemoveRef[0];
|
|
FilesToRemoveRef.push_back(Filename);
|
|
|
|
// We want to call 'c_str()' on every std::string in this vector so that if
|
|
// the underlying implementation requires a re-allocation, it happens here
|
|
// rather than inside of the signal handler. If we see the vector grow, we
|
|
// have to call it on every entry. If it remains in place, we only need to
|
|
// call it on the latest one.
|
|
if (OldPtr == &FilesToRemoveRef[0])
|
|
FilesToRemoveRef.back().c_str();
|
|
else
|
|
for (unsigned i = 0, e = FilesToRemoveRef.size(); i != e; ++i)
|
|
FilesToRemoveRef[i].c_str();
|
|
}
|
|
|
|
RegisterHandlers();
|
|
return false;
|
|
}
|
|
|
|
// DontRemoveFileOnSignal - The public API
|
|
void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
|
|
sys::SmartScopedLock<true> Guard(*SignalsMutex);
|
|
std::vector<std::string>::reverse_iterator RI =
|
|
std::find(FilesToRemove->rbegin(), FilesToRemove->rend(), Filename);
|
|
std::vector<std::string>::iterator I = FilesToRemove->end();
|
|
if (RI != FilesToRemove->rend())
|
|
I = FilesToRemove->erase(RI.base()-1);
|
|
}
|
|
|
|
/// AddSignalHandler - Add a function to be called when a signal is delivered
|
|
/// to the process. The handler can have a cookie passed to it to identify
|
|
/// what instance of the handler it is.
|
|
void llvm::sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
|
|
CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
|
|
RegisterHandlers();
|
|
}
|
|
|
|
#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
|
|
|
|
#if HAVE_LINK_H && (defined(__linux__) || defined(__FreeBSD__) || \
|
|
defined(__FreeBSD_kernel__) || defined(__NetBSD__))
|
|
struct DlIteratePhdrData {
|
|
void **StackTrace;
|
|
int depth;
|
|
bool first;
|
|
const char **modules;
|
|
intptr_t *offsets;
|
|
const char *main_exec_name;
|
|
};
|
|
|
|
static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
|
|
DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
|
|
const char *name = data->first ? data->main_exec_name : info->dlpi_name;
|
|
data->first = false;
|
|
for (int i = 0; i < info->dlpi_phnum; i++) {
|
|
const auto *phdr = &info->dlpi_phdr[i];
|
|
if (phdr->p_type != PT_LOAD)
|
|
continue;
|
|
intptr_t beg = info->dlpi_addr + phdr->p_vaddr;
|
|
intptr_t end = beg + phdr->p_memsz;
|
|
for (int j = 0; j < data->depth; j++) {
|
|
if (data->modules[j])
|
|
continue;
|
|
intptr_t addr = (intptr_t)data->StackTrace[j];
|
|
if (beg <= addr && addr < end) {
|
|
data->modules[j] = name;
|
|
data->offsets[j] = addr - info->dlpi_addr;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static bool findModulesAndOffsets(void **StackTrace, int Depth,
|
|
const char **Modules, intptr_t *Offsets,
|
|
const char *MainExecutableName) {
|
|
DlIteratePhdrData data = {StackTrace, Depth, true,
|
|
Modules, Offsets, MainExecutableName};
|
|
dl_iterate_phdr(dl_iterate_phdr_cb, &data);
|
|
return true;
|
|
}
|
|
#else
|
|
static bool findModulesAndOffsets(void **StackTrace, int Depth,
|
|
const char **Modules, intptr_t *Offsets,
|
|
const char *MainExecutableName) {
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static bool printSymbolizedStackTrace(void **StackTrace, int Depth,
|
|
llvm::raw_ostream &OS) {
|
|
// FIXME: Subtract necessary number from StackTrace entries to turn return addresses
|
|
// into actual instruction addresses.
|
|
// Use llvm-symbolizer tool to symbolize the stack traces.
|
|
ErrorOr<std::string> LLVMSymbolizerPathOrErr =
|
|
sys::findProgramByName("llvm-symbolizer");
|
|
if (!LLVMSymbolizerPathOrErr)
|
|
return false;
|
|
const std::string &LLVMSymbolizerPath = *LLVMSymbolizerPathOrErr;
|
|
// We don't know argv0 or the address of main() at this point, but try
|
|
// to guess it anyway (it's possible on some platforms).
|
|
std::string MainExecutableName = sys::fs::getMainExecutable(nullptr, nullptr);
|
|
if (MainExecutableName.empty() ||
|
|
MainExecutableName.find("llvm-symbolizer") != std::string::npos)
|
|
return false;
|
|
|
|
std::vector<const char *> Modules(Depth, nullptr);
|
|
std::vector<intptr_t> Offsets(Depth, 0);
|
|
if (!findModulesAndOffsets(StackTrace, Depth, Modules.data(), Offsets.data(),
|
|
MainExecutableName.c_str()))
|
|
return false;
|
|
int InputFD;
|
|
SmallString<32> InputFile, OutputFile;
|
|
sys::fs::createTemporaryFile("symbolizer-input", "", InputFD, InputFile);
|
|
sys::fs::createTemporaryFile("symbolizer-output", "", OutputFile);
|
|
FileRemover InputRemover(InputFile.c_str());
|
|
FileRemover OutputRemover(OutputFile.c_str());
|
|
|
|
{
|
|
raw_fd_ostream Input(InputFD, true);
|
|
for (int i = 0; i < Depth; i++) {
|
|
if (Modules[i])
|
|
Input << Modules[i] << " " << (void*)Offsets[i] << "\n";
|
|
}
|
|
}
|
|
|
|
StringRef InputFileStr(InputFile);
|
|
StringRef OutputFileStr(OutputFile);
|
|
StringRef StderrFileStr;
|
|
const StringRef *Redirects[] = {&InputFileStr, &OutputFileStr,
|
|
&StderrFileStr};
|
|
const char *Args[] = {"llvm-symbolizer", "--functions=linkage", "--inlining",
|
|
"--demangle", nullptr};
|
|
int RunResult =
|
|
sys::ExecuteAndWait(LLVMSymbolizerPath, Args, nullptr, Redirects);
|
|
if (RunResult != 0)
|
|
return false;
|
|
|
|
auto OutputBuf = MemoryBuffer::getFile(OutputFile.c_str());
|
|
if (!OutputBuf)
|
|
return false;
|
|
StringRef Output = OutputBuf.get()->getBuffer();
|
|
SmallVector<StringRef, 32> Lines;
|
|
Output.split(Lines, "\n");
|
|
auto CurLine = Lines.begin();
|
|
int frame_no = 0;
|
|
for (int i = 0; i < Depth; i++) {
|
|
if (!Modules[i]) {
|
|
OS << format("#%d %p\n", frame_no++, StackTrace[i]);
|
|
continue;
|
|
}
|
|
// Read pairs of lines (function name and file/line info) until we
|
|
// encounter empty line.
|
|
for (;;) {
|
|
if (CurLine == Lines.end())
|
|
return false;
|
|
StringRef FunctionName = *CurLine++;
|
|
if (FunctionName.empty())
|
|
break;
|
|
OS << format("#%d %p ", frame_no++, StackTrace[i]);
|
|
if (!FunctionName.startswith("??"))
|
|
OS << format("%s ", FunctionName.str().c_str());
|
|
if (CurLine == Lines.end())
|
|
return false;
|
|
StringRef FileLineInfo = *CurLine++;
|
|
if (!FileLineInfo.startswith("??"))
|
|
OS << format("%s", FileLineInfo.str().c_str());
|
|
else
|
|
OS << format("(%s+%p)", Modules[i], (void *)Offsets[i]);
|
|
OS << "\n";
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
#endif // defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
|
|
|
|
// PrintStackTrace - In the case of a program crash or fault, print out a stack
|
|
// trace so that the user has an indication of why and where we died.
|
|
//
|
|
// On glibc systems we have the 'backtrace' function, which works nicely, but
|
|
// doesn't demangle symbols.
|
|
void llvm::sys::PrintStackTrace(raw_ostream &OS) {
|
|
#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
|
|
static void* StackTrace[256];
|
|
// Use backtrace() to output a backtrace on Linux systems with glibc.
|
|
int depth = backtrace(StackTrace,
|
|
static_cast<int>(array_lengthof(StackTrace)));
|
|
if (printSymbolizedStackTrace(StackTrace, depth, OS))
|
|
return;
|
|
#if HAVE_DLFCN_H && __GNUG__
|
|
int width = 0;
|
|
for (int i = 0; i < depth; ++i) {
|
|
Dl_info dlinfo;
|
|
dladdr(StackTrace[i], &dlinfo);
|
|
const char* name = strrchr(dlinfo.dli_fname, '/');
|
|
|
|
int nwidth;
|
|
if (!name) nwidth = strlen(dlinfo.dli_fname);
|
|
else nwidth = strlen(name) - 1;
|
|
|
|
if (nwidth > width) width = nwidth;
|
|
}
|
|
|
|
for (int i = 0; i < depth; ++i) {
|
|
Dl_info dlinfo;
|
|
dladdr(StackTrace[i], &dlinfo);
|
|
|
|
OS << format("%-2d", i);
|
|
|
|
const char* name = strrchr(dlinfo.dli_fname, '/');
|
|
if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
|
|
else OS << format(" %-*s", width, name+1);
|
|
|
|
OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
|
|
(unsigned long)StackTrace[i]);
|
|
|
|
if (dlinfo.dli_sname != nullptr) {
|
|
OS << ' ';
|
|
# if HAVE_CXXABI_H
|
|
int res;
|
|
char* d = abi::__cxa_demangle(dlinfo.dli_sname, nullptr, nullptr, &res);
|
|
# else
|
|
char* d = NULL;
|
|
# endif
|
|
if (!d) OS << dlinfo.dli_sname;
|
|
else OS << d;
|
|
free(d);
|
|
|
|
// FIXME: When we move to C++11, use %t length modifier. It's not in
|
|
// C++03 and causes gcc to issue warnings. Losing the upper 32 bits of
|
|
// the stack offset for a stack dump isn't likely to cause any problems.
|
|
OS << format(" + %u",(unsigned)((char*)StackTrace[i]-
|
|
(char*)dlinfo.dli_saddr));
|
|
}
|
|
OS << '\n';
|
|
}
|
|
#else
|
|
backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static void PrintStackTraceSignalHandler(void *) {
|
|
PrintStackTrace(llvm::errs());
|
|
}
|
|
|
|
void llvm::sys::DisableSystemDialogsOnCrash() {}
|
|
|
|
/// PrintStackTraceOnErrorSignal - When an error signal (such as SIGABRT or
|
|
/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
|
|
void llvm::sys::PrintStackTraceOnErrorSignal(bool DisableCrashReporting) {
|
|
AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
|
|
|
|
#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
|
|
// Environment variable to disable any kind of crash dialog.
|
|
if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
|
|
mach_port_t self = mach_task_self();
|
|
|
|
exception_mask_t mask = EXC_MASK_CRASH;
|
|
|
|
kern_return_t ret = task_set_exception_ports(self,
|
|
mask,
|
|
MACH_PORT_NULL,
|
|
EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
|
|
THREAD_STATE_NONE);
|
|
(void)ret;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
/***/
|
|
|
|
// On Darwin, raise sends a signal to the main thread instead of the current
|
|
// thread. This has the unfortunate effect that assert() and abort() will end up
|
|
// bypassing our crash recovery attempts. We work around this for anything in
|
|
// the same linkage unit by just defining our own versions of the assert handler
|
|
// and abort.
|
|
|
|
#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
|
|
|
|
#include <signal.h>
|
|
#include <pthread.h>
|
|
|
|
int raise(int sig) {
|
|
return pthread_kill(pthread_self(), sig);
|
|
}
|
|
|
|
void __assert_rtn(const char *func,
|
|
const char *file,
|
|
int line,
|
|
const char *expr) {
|
|
if (func)
|
|
fprintf(stderr, "Assertion failed: (%s), function %s, file %s, line %d.\n",
|
|
expr, func, file, line);
|
|
else
|
|
fprintf(stderr, "Assertion failed: (%s), file %s, line %d.\n",
|
|
expr, file, line);
|
|
abort();
|
|
}
|
|
|
|
void abort() {
|
|
raise(SIGABRT);
|
|
usleep(1000);
|
|
__builtin_trap();
|
|
}
|
|
|
|
#endif
|