Line data Source code
1 : //===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===//
2 : //
3 : // The LLVM Compiler Infrastructure
4 : //
5 : // This file is distributed under the University of Illinois Open Source
6 : // License. See LICENSE.TXT for details.
7 : //
8 : //===----------------------------------------------------------------------===//
9 : //
10 : // This file defines some helpful functions for dealing with the possibility of
11 : // Unix signals occurring while your program is running.
12 : //
13 : //===----------------------------------------------------------------------===//
14 : //
15 : // This file is extremely careful to only do signal-safe things while in a
16 : // signal handler. In particular, memory allocation and acquiring a mutex
17 : // while in a signal handler should never occur. ManagedStatic isn't usable from
18 : // a signal handler for 2 reasons:
19 : //
20 : // 1. Creating a new one allocates.
21 : // 2. The signal handler could fire while llvm_shutdown is being processed, in
22 : // which case the ManagedStatic is in an unknown state because it could
23 : // already have been destroyed, or be in the process of being destroyed.
24 : //
25 : // Modifying the behavior of the signal handlers (such as registering new ones)
26 : // can acquire a mutex, but all this guarantees is that the signal handler
27 : // behavior is only modified by one thread at a time. A signal handler can still
28 : // fire while this occurs!
29 : //
30 : // Adding work to a signal handler requires lock-freedom (and assume atomics are
31 : // always lock-free) because the signal handler could fire while new work is
32 : // being added.
33 : //
34 : //===----------------------------------------------------------------------===//
35 :
36 : #include "Unix.h"
37 : #include "llvm/ADT/STLExtras.h"
38 : #include "llvm/Config/config.h"
39 : #include "llvm/Demangle/Demangle.h"
40 : #include "llvm/Support/FileSystem.h"
41 : #include "llvm/Support/FileUtilities.h"
42 : #include "llvm/Support/Format.h"
43 : #include "llvm/Support/MemoryBuffer.h"
44 : #include "llvm/Support/Mutex.h"
45 : #include "llvm/Support/Program.h"
46 : #include "llvm/Support/UniqueLock.h"
47 : #include "llvm/Support/raw_ostream.h"
48 : #include <algorithm>
49 : #include <string>
50 : #include <sysexits.h>
51 : #ifdef HAVE_BACKTRACE
52 : # include BACKTRACE_HEADER // For backtrace().
53 : #endif
54 : #if HAVE_SIGNAL_H
55 : #include <signal.h>
56 : #endif
57 : #if HAVE_SYS_STAT_H
58 : #include <sys/stat.h>
59 : #endif
60 : #if HAVE_DLFCN_H
61 : #include <dlfcn.h>
62 : #endif
63 : #if HAVE_MACH_MACH_H
64 : #include <mach/mach.h>
65 : #endif
66 : #if HAVE_LINK_H
67 : #include <link.h>
68 : #endif
69 : #ifdef HAVE__UNWIND_BACKTRACE
70 : // FIXME: We should be able to use <unwind.h> for any target that has an
71 : // _Unwind_Backtrace function, but on FreeBSD the configure test passes
72 : // despite the function not existing, and on Android, <unwind.h> conflicts
73 : // with <link.h>.
74 : #ifdef __GLIBC__
75 : #include <unwind.h>
76 : #else
77 : #undef HAVE__UNWIND_BACKTRACE
78 : #endif
79 : #endif
80 :
81 : using namespace llvm;
82 :
83 : static RETSIGTYPE SignalHandler(int Sig); // defined below.
84 :
85 : /// The function to call if ctrl-c is pressed.
86 : using InterruptFunctionType = void (*)();
87 : static std::atomic<InterruptFunctionType> InterruptFunction =
88 : ATOMIC_VAR_INIT(nullptr);
89 :
90 : namespace {
91 : /// Signal-safe removal of files.
92 : /// Inserting and erasing from the list isn't signal-safe, but removal of files
93 : /// themselves is signal-safe. Memory is freed when the head is freed, deletion
94 : /// is therefore not signal-safe either.
95 : class FileToRemoveList {
96 : std::atomic<char *> Filename = ATOMIC_VAR_INIT(nullptr);
97 : std::atomic<FileToRemoveList *> Next = ATOMIC_VAR_INIT(nullptr);
98 :
99 : FileToRemoveList() = default;
100 : // Not signal-safe.
101 57978 : FileToRemoveList(const std::string &str) : Filename(strdup(str.c_str())) {}
102 :
103 : public:
104 : // Not signal-safe.
105 28753 : ~FileToRemoveList() {
106 28753 : if (FileToRemoveList *N = Next.exchange(nullptr))
107 3763 : delete N;
108 28753 : if (char *F = Filename.exchange(nullptr))
109 16674 : free(F);
110 28753 : }
111 :
112 : // Not signal-safe.
113 28989 : static void insert(std::atomic<FileToRemoveList *> &Head,
114 : const std::string &Filename) {
115 : // Insert the new file at the end of the list.
116 28989 : FileToRemoveList *NewHead = new FileToRemoveList(Filename);
117 : std::atomic<FileToRemoveList *> *InsertionPoint = &Head;
118 : FileToRemoveList *OldHead = nullptr;
119 36534 : while (!InsertionPoint->compare_exchange_strong(OldHead, NewHead)) {
120 7545 : InsertionPoint = &OldHead->Next;
121 : OldHead = nullptr;
122 : }
123 28989 : }
124 :
125 : // Not signal-safe.
126 12286 : static void erase(std::atomic<FileToRemoveList *> &Head,
127 : const std::string &Filename) {
128 : // Use a lock to avoid concurrent erase: the comparison would access
129 : // free'd memory.
130 12286 : static ManagedStatic<sys::SmartMutex<true>> Lock;
131 12286 : sys::SmartScopedLock<true> Writer(*Lock);
132 :
133 32613 : for (FileToRemoveList *Current = Head.load(); Current;
134 : Current = Current->Next.load()) {
135 20327 : if (char *OldFilename = Current->Filename.load()) {
136 13025 : if (OldFilename != Filename)
137 : continue;
138 : // Leave an empty filename.
139 : OldFilename = Current->Filename.exchange(nullptr);
140 : // The filename might have become null between the time we
141 : // compared it and we exchanged it.
142 12253 : if (OldFilename)
143 12253 : free(OldFilename);
144 : }
145 : }
146 12286 : }
147 :
148 : // Signal-safe.
149 365 : static void removeAllFiles(std::atomic<FileToRemoveList *> &Head) {
150 : // If cleanup were to occur while we're removing files we'd have a bad time.
151 : // Make sure we're OK by preventing cleanup from doing anything while we're
152 : // removing files. If cleanup races with us and we win we'll have a leak,
153 : // but we won't crash.
154 : FileToRemoveList *OldHead = Head.exchange(nullptr);
155 :
156 426 : for (FileToRemoveList *currentFile = OldHead; currentFile;
157 : currentFile = currentFile->Next.load()) {
158 : // If erasing was occuring while we're trying to remove files we'd look
159 : // at free'd data. Take away the path and put it back when done.
160 61 : if (char *path = currentFile->Filename.exchange(nullptr)) {
161 : // Get the status so we can determine if it's a file or directory. If we
162 : // can't stat the file, ignore it.
163 : struct stat buf;
164 59 : if (stat(path, &buf) != 0)
165 52 : continue;
166 :
167 : // If this is not a regular file, ignore it. We want to prevent removal
168 : // of special files like /dev/null, even if the compiler is being run
169 : // with the super-user permissions.
170 58 : if (!S_ISREG(buf.st_mode))
171 : continue;
172 :
173 : // Otherwise, remove the file. We ignore any errors here as there is
174 : // nothing else we can do.
175 7 : unlink(path);
176 :
177 : // We're done removing the file, erasing can safely proceed.
178 : currentFile->Filename.exchange(path);
179 : }
180 : }
181 :
182 : // We're done removing files, cleanup can safely proceed.
183 : Head.exchange(OldHead);
184 365 : }
185 : };
186 : static std::atomic<FileToRemoveList *> FilesToRemove = ATOMIC_VAR_INIT(nullptr);
187 :
188 : /// Clean up the list in a signal-friendly manner.
189 : /// Recall that signals can fire during llvm_shutdown. If this occurs we should
190 : /// either clean something up or nothing at all, but we shouldn't crash!
191 : struct FilesToRemoveCleanup {
192 : // Not signal-safe.
193 0 : ~FilesToRemoveCleanup() {
194 : FileToRemoveList *Head = FilesToRemove.exchange(nullptr);
195 0 : if (Head)
196 0 : delete Head;
197 0 : }
198 : };
199 : } // namespace
200 :
201 : static StringRef Argv0;
202 :
203 : // Signals that represent requested termination. There's no bug or failure, or
204 : // if there is, it's not our direct responsibility. For whatever reason, our
205 : // continued execution is no longer desirable.
206 : static const int IntSigs[] = {
207 : SIGHUP, SIGINT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
208 : };
209 :
210 : // Signals that represent that we have a bug, and our prompt termination has
211 : // been ordered.
212 : static const int KillSigs[] = {
213 : SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGQUIT
214 : #ifdef SIGSYS
215 : , SIGSYS
216 : #endif
217 : #ifdef SIGXCPU
218 : , SIGXCPU
219 : #endif
220 : #ifdef SIGXFSZ
221 : , SIGXFSZ
222 : #endif
223 : #ifdef SIGEMT
224 : , SIGEMT
225 : #endif
226 : };
227 :
228 : static std::atomic<unsigned> NumRegisteredSignals = ATOMIC_VAR_INIT(0);
229 : static struct {
230 : struct sigaction SA;
231 : int SigNo;
232 : } RegisteredSignalInfo[array_lengthof(IntSigs) + array_lengthof(KillSigs)];
233 :
234 : #if defined(HAVE_SIGALTSTACK)
235 : // Hold onto both the old and new alternate signal stack so that it's not
236 : // reported as a leak. We don't make any attempt to remove our alt signal
237 : // stack if we remove our signal handlers; that can't be done reliably if
238 : // someone else is also trying to do the same thing.
239 : static stack_t OldAltStack;
240 : static void* NewAltStackPointer;
241 :
242 174426 : static void CreateSigAltStack() {
243 : const size_t AltStackSize = MINSIGSTKSZ + 64 * 1024;
244 :
245 : // If we're executing on the alternate stack, or we already have an alternate
246 : // signal stack that we're happy with, there's nothing for us to do. Don't
247 : // reduce the size, some other part of the process might need a larger stack
248 : // than we do.
249 174426 : if (sigaltstack(nullptr, &OldAltStack) != 0 ||
250 174426 : OldAltStack.ss_flags & SS_ONSTACK ||
251 174426 : (OldAltStack.ss_sp && OldAltStack.ss_size >= AltStackSize))
252 0 : return;
253 :
254 174426 : stack_t AltStack = {};
255 174426 : AltStack.ss_sp = static_cast<char *>(safe_malloc(AltStackSize));
256 174426 : NewAltStackPointer = AltStack.ss_sp; // Save to avoid reporting a leak.
257 174426 : AltStack.ss_size = AltStackSize;
258 174426 : if (sigaltstack(&AltStack, &OldAltStack) != 0)
259 0 : free(AltStack.ss_sp);
260 : }
261 : #else
262 : static void CreateSigAltStack() {}
263 : #endif
264 :
265 369694 : static void RegisterHandlers() { // Not signal-safe.
266 : // The mutex prevents other threads from registering handlers while we're
267 : // doing it. We also have to protect the handlers and their count because
268 : // a signal handler could fire while we're registeting handlers.
269 369694 : static ManagedStatic<sys::SmartMutex<true>> SignalHandlerRegistrationMutex;
270 369694 : sys::SmartScopedLock<true> Guard(*SignalHandlerRegistrationMutex);
271 :
272 : // If the handlers are already registered, we're done.
273 369694 : if (NumRegisteredSignals.load() != 0)
274 : return;
275 :
276 : // Create an alternate stack for signal handling. This is necessary for us to
277 : // be able to reliably handle signals due to stack overflow.
278 174426 : CreateSigAltStack();
279 :
280 : auto registerHandler = [&](int Signal) {
281 : unsigned Index = NumRegisteredSignals.load();
282 : assert(Index < array_lengthof(RegisteredSignalInfo) &&
283 : "Out of space for signal handlers!");
284 :
285 : struct sigaction NewHandler;
286 :
287 : NewHandler.sa_handler = SignalHandler;
288 : NewHandler.sa_flags = SA_NODEFER | SA_RESETHAND | SA_ONSTACK;
289 : sigemptyset(&NewHandler.sa_mask);
290 :
291 : // Install the new handler, save the old one in RegisteredSignalInfo.
292 : sigaction(Signal, &NewHandler, &RegisteredSignalInfo[Index].SA);
293 : RegisteredSignalInfo[Index].SigNo = Signal;
294 : ++NumRegisteredSignals;
295 : };
296 :
297 1220982 : for (auto S : IntSigs)
298 1046556 : registerHandler(S);
299 1918686 : for (auto S : KillSigs)
300 1744260 : registerHandler(S);
301 : }
302 :
303 9 : static void UnregisterHandlers() {
304 : // Restore all of the signal handlers to how they were before we showed up.
305 153 : for (unsigned i = 0, e = NumRegisteredSignals.load(); i != e; ++i) {
306 144 : sigaction(RegisteredSignalInfo[i].SigNo,
307 144 : &RegisteredSignalInfo[i].SA, nullptr);
308 : --NumRegisteredSignals;
309 : }
310 9 : }
311 :
312 : /// Process the FilesToRemove list.
313 : static void RemoveFilesToRemove() {
314 9 : FileToRemoveList::removeAllFiles(FilesToRemove);
315 : }
316 :
317 : // The signal handler that runs.
318 9 : static RETSIGTYPE SignalHandler(int Sig) {
319 : // Restore the signal behavior to default, so that the program actually
320 : // crashes when we return and the signal reissues. This also ensures that if
321 : // we crash in our signal handler that the program will terminate immediately
322 : // instead of recursing in the signal handler.
323 9 : UnregisterHandlers();
324 :
325 : // Unmask all potentially blocked kill signals.
326 : sigset_t SigMask;
327 9 : sigfillset(&SigMask);
328 9 : sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
329 :
330 : {
331 : RemoveFilesToRemove();
332 :
333 9 : if (std::find(std::begin(IntSigs), std::end(IntSigs), Sig)
334 : != std::end(IntSigs)) {
335 9 : if (auto OldInterruptFunction = InterruptFunction.exchange(nullptr))
336 0 : return OldInterruptFunction();
337 :
338 : // Send a special return code that drivers can check for, from sysexits.h.
339 9 : if (Sig == SIGPIPE)
340 9 : exit(EX_IOERR);
341 :
342 0 : raise(Sig); // Execute the default handler.
343 0 : return;
344 : }
345 : }
346 :
347 : // Otherwise if it is a fault (like SEGV) run any handler.
348 0 : llvm::sys::RunSignalHandlers();
349 :
350 : #ifdef __s390__
351 : // On S/390, certain signals are delivered with PSW Address pointing to
352 : // *after* the faulting instruction. Simply returning from the signal
353 : // handler would continue execution after that point, instead of
354 : // re-raising the signal. Raise the signal manually in those cases.
355 : if (Sig == SIGILL || Sig == SIGFPE || Sig == SIGTRAP)
356 : raise(Sig);
357 : #endif
358 : }
359 :
360 356 : void llvm::sys::RunInterruptHandlers() {
361 : RemoveFilesToRemove();
362 356 : }
363 :
364 11 : void llvm::sys::SetInterruptFunction(void (*IF)()) {
365 : InterruptFunction.exchange(IF);
366 11 : RegisterHandlers();
367 11 : }
368 :
369 : // The public API
370 28989 : bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
371 : std::string* ErrMsg) {
372 : // Ensure that cleanup will occur as soon as one file is added.
373 28989 : static ManagedStatic<FilesToRemoveCleanup> FilesToRemoveCleanup;
374 28989 : *FilesToRemoveCleanup;
375 57978 : FileToRemoveList::insert(FilesToRemove, Filename.str());
376 28989 : RegisterHandlers();
377 28989 : return false;
378 : }
379 :
380 : // The public API
381 12286 : void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
382 24572 : FileToRemoveList::erase(FilesToRemove, Filename.str());
383 12286 : }
384 :
385 : /// Add a function to be called when a signal is delivered to the process. The
386 : /// handler can have a cookie passed to it to identify what instance of the
387 : /// handler it is.
388 340694 : void llvm::sys::AddSignalHandler(sys::SignalHandlerCallback FnPtr,
389 : void *Cookie) { // Signal-safe.
390 340694 : insertSignalHandler(FnPtr, Cookie);
391 340694 : RegisterHandlers();
392 340694 : }
393 :
394 : #if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES && HAVE_LINK_H && \
395 : (defined(__linux__) || defined(__FreeBSD__) || \
396 : defined(__FreeBSD_kernel__) || defined(__NetBSD__))
397 : struct DlIteratePhdrData {
398 : void **StackTrace;
399 : int depth;
400 : bool first;
401 : const char **modules;
402 : intptr_t *offsets;
403 : const char *main_exec_name;
404 : };
405 :
406 0 : static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
407 : DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
408 0 : const char *name = data->first ? data->main_exec_name : info->dlpi_name;
409 0 : data->first = false;
410 0 : for (int i = 0; i < info->dlpi_phnum; i++) {
411 0 : const auto *phdr = &info->dlpi_phdr[i];
412 0 : if (phdr->p_type != PT_LOAD)
413 : continue;
414 0 : intptr_t beg = info->dlpi_addr + phdr->p_vaddr;
415 0 : intptr_t end = beg + phdr->p_memsz;
416 0 : for (int j = 0; j < data->depth; j++) {
417 0 : if (data->modules[j])
418 : continue;
419 0 : intptr_t addr = (intptr_t)data->StackTrace[j];
420 0 : if (beg <= addr && addr < end) {
421 0 : data->modules[j] = name;
422 0 : data->offsets[j] = addr - info->dlpi_addr;
423 : }
424 : }
425 : }
426 0 : return 0;
427 : }
428 :
429 : /// If this is an ELF platform, we can find all loaded modules and their virtual
430 : /// addresses with dl_iterate_phdr.
431 0 : static bool findModulesAndOffsets(void **StackTrace, int Depth,
432 : const char **Modules, intptr_t *Offsets,
433 : const char *MainExecutableName,
434 : StringSaver &StrPool) {
435 0 : DlIteratePhdrData data = {StackTrace, Depth, true,
436 0 : Modules, Offsets, MainExecutableName};
437 0 : dl_iterate_phdr(dl_iterate_phdr_cb, &data);
438 0 : return true;
439 : }
440 : #else
441 : /// This platform does not have dl_iterate_phdr, so we do not yet know how to
442 : /// find all loaded DSOs.
443 : static bool findModulesAndOffsets(void **StackTrace, int Depth,
444 : const char **Modules, intptr_t *Offsets,
445 : const char *MainExecutableName,
446 : StringSaver &StrPool) {
447 : return false;
448 : }
449 : #endif // defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES && ...
450 :
451 : #if ENABLE_BACKTRACES && defined(HAVE__UNWIND_BACKTRACE)
452 0 : static int unwindBacktrace(void **StackTrace, int MaxEntries) {
453 0 : if (MaxEntries < 0)
454 : return 0;
455 :
456 : // Skip the first frame ('unwindBacktrace' itself).
457 0 : int Entries = -1;
458 :
459 : auto HandleFrame = [&](_Unwind_Context *Context) -> _Unwind_Reason_Code {
460 : // Apparently we need to detect reaching the end of the stack ourselves.
461 : void *IP = (void *)_Unwind_GetIP(Context);
462 : if (!IP)
463 : return _URC_END_OF_STACK;
464 :
465 : assert(Entries < MaxEntries && "recursively called after END_OF_STACK?");
466 : if (Entries >= 0)
467 : StackTrace[Entries] = IP;
468 :
469 : if (++Entries == MaxEntries)
470 : return _URC_END_OF_STACK;
471 : return _URC_NO_REASON;
472 0 : };
473 :
474 0 : _Unwind_Backtrace(
475 : [](_Unwind_Context *Context, void *Handler) {
476 : return (*static_cast<decltype(HandleFrame) *>(Handler))(Context);
477 : },
478 : static_cast<void *>(&HandleFrame));
479 0 : return std::max(Entries, 0);
480 : }
481 : #endif
482 :
483 : // In the case of a program crash or fault, print out a stack trace so that the
484 : // user has an indication of why and where we died.
485 : //
486 : // On glibc systems we have the 'backtrace' function, which works nicely, but
487 : // doesn't demangle symbols.
488 0 : void llvm::sys::PrintStackTrace(raw_ostream &OS) {
489 : #if ENABLE_BACKTRACES
490 : static void *StackTrace[256];
491 : int depth = 0;
492 : #if defined(HAVE_BACKTRACE)
493 : // Use backtrace() to output a backtrace on Linux systems with glibc.
494 : if (!depth)
495 0 : depth = backtrace(StackTrace, static_cast<int>(array_lengthof(StackTrace)));
496 : #endif
497 : #if defined(HAVE__UNWIND_BACKTRACE)
498 : // Try _Unwind_Backtrace() if backtrace() failed.
499 0 : if (!depth)
500 0 : depth = unwindBacktrace(StackTrace,
501 : static_cast<int>(array_lengthof(StackTrace)));
502 : #endif
503 0 : if (!depth)
504 : return;
505 :
506 0 : if (printSymbolizedStackTrace(Argv0, StackTrace, depth, OS))
507 : return;
508 : #if HAVE_DLFCN_H && HAVE_DLADDR
509 : int width = 0;
510 : for (int i = 0; i < depth; ++i) {
511 : Dl_info dlinfo;
512 : dladdr(StackTrace[i], &dlinfo);
513 : const char* name = strrchr(dlinfo.dli_fname, '/');
514 :
515 : int nwidth;
516 : if (!name) nwidth = strlen(dlinfo.dli_fname);
517 : else nwidth = strlen(name) - 1;
518 :
519 : if (nwidth > width) width = nwidth;
520 : }
521 :
522 : for (int i = 0; i < depth; ++i) {
523 : Dl_info dlinfo;
524 : dladdr(StackTrace[i], &dlinfo);
525 :
526 : OS << format("%-2d", i);
527 :
528 : const char* name = strrchr(dlinfo.dli_fname, '/');
529 : if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
530 : else OS << format(" %-*s", width, name+1);
531 :
532 : OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
533 : (unsigned long)StackTrace[i]);
534 :
535 : if (dlinfo.dli_sname != nullptr) {
536 : OS << ' ';
537 : int res;
538 : char* d = itaniumDemangle(dlinfo.dli_sname, nullptr, nullptr, &res);
539 : if (!d) OS << dlinfo.dli_sname;
540 : else OS << d;
541 : free(d);
542 :
543 : // FIXME: When we move to C++11, use %t length modifier. It's not in
544 : // C++03 and causes gcc to issue warnings. Losing the upper 32 bits of
545 : // the stack offset for a stack dump isn't likely to cause any problems.
546 : OS << format(" + %u",(unsigned)((char*)StackTrace[i]-
547 : (char*)dlinfo.dli_saddr));
548 : }
549 : OS << '\n';
550 : }
551 : #elif defined(HAVE_BACKTRACE)
552 0 : backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
553 : #endif
554 : #endif
555 : }
556 :
557 0 : static void PrintStackTraceSignalHandler(void *) {
558 0 : sys::PrintStackTrace(llvm::errs());
559 0 : }
560 :
561 0 : void llvm::sys::DisableSystemDialogsOnCrash() {}
562 :
563 : /// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
564 : /// process, print a stack trace and then exit.
565 174382 : void llvm::sys::PrintStackTraceOnErrorSignal(StringRef Argv0,
566 : bool DisableCrashReporting) {
567 174382 : ::Argv0 = Argv0;
568 :
569 174382 : AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
570 :
571 : #if defined(__APPLE__) && ENABLE_CRASH_OVERRIDES
572 : // Environment variable to disable any kind of crash dialog.
573 : if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
574 : mach_port_t self = mach_task_self();
575 :
576 : exception_mask_t mask = EXC_MASK_CRASH;
577 :
578 : kern_return_t ret = task_set_exception_ports(self,
579 : mask,
580 : MACH_PORT_NULL,
581 : EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
582 : THREAD_STATE_NONE);
583 : (void)ret;
584 : }
585 : #endif
586 174382 : }
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