#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 <vector>
+#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_SYS_STAT_H
#include <sys/stat.h>
#endif
-#if HAVE_DLFCN_H && __GNUG__
-#include <dlfcn.h>
+#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 SmartMutex<true> SignalsMutex;
+static ManagedStatic<SmartMutex<true> > SignalsMutex;
/// InterruptFunction - The function to call if ctrl-c is pressed.
-static void (*InterruptFunction)() = 0;
+static void (*InterruptFunction)() = nullptr;
-static std::vector<sys::Path> FilesToRemove;
-static std::vector<std::pair<void(*)(void*), void*> > CallBacksToRun;
+static ManagedStatic<std::vector<std::string>> FilesToRemove;
-// IntSigs - Signals that may interrupt the program at any time.
+// 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, SIGQUIT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
+ SIGHUP, SIGINT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
};
-static const int *const IntSigsEnd =
- IntSigs + sizeof(IntSigs) / sizeof(IntSigs[0]);
-// KillSigs - Signals that are synchronous with the program that will cause it
-// to die.
+// 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
+ SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGQUIT
#ifdef SIGSYS
, SIGSYS
#endif
, SIGEMT
#endif
};
-static const int *const KillSigsEnd =
- KillSigs + sizeof(KillSigs) / sizeof(KillSigs[0]);
static unsigned NumRegisteredSignals = 0;
static struct {
}
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;
- std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
- std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
+ 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, 0);
+ &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() {
- while (!FilesToRemove.empty()) {
- FilesToRemove.back().eraseFromDisk(true);
- FilesToRemove.pop_back();
+ // 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) {
+ 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);
}
}
// Unmask all potentially blocked kill signals.
sigset_t SigMask;
sigfillset(&SigMask);
- sigprocmask(SIG_UNBLOCK, &SigMask, 0);
-
- SignalsMutex.acquire();
- RemoveFilesToRemove();
-
- if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd) {
- if (InterruptFunction) {
- void (*IF)() = InterruptFunction;
- SignalsMutex.release();
- InterruptFunction = 0;
- IF(); // run the interrupt function.
+ 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;
- }
-
- SignalsMutex.release();
- raise(Sig); // Execute the default handler.
- return;
+ }
}
- SignalsMutex.release();
-
// Otherwise if it is a fault (like SEGV) run any handler.
- for (unsigned i = 0, e = CallBacksToRun.size(); i != e; ++i)
- CallBacksToRun[i].first(CallBacksToRun[i].second);
+ llvm::sys::RunSignalHandlers();
+
+#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() {
- SignalsMutex.acquire();
+ sys::SmartScopedLock<true> Guard(*SignalsMutex);
RemoveFilesToRemove();
- SignalsMutex.release();
}
void llvm::sys::SetInterruptFunction(void (*IF)()) {
- SignalsMutex.acquire();
- InterruptFunction = IF;
- SignalsMutex.release();
+ {
+ sys::SmartScopedLock<true> Guard(*SignalsMutex);
+ InterruptFunction = IF;
+ }
RegisterHandlers();
}
// RemoveFileOnSignal - The public API
-bool llvm::sys::RemoveFileOnSignal(const sys::Path &Filename,
+bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
std::string* ErrMsg) {
- SignalsMutex.acquire();
- FilesToRemove.push_back(Filename);
-
- SignalsMutex.release();
+ {
+ sys::SmartScopedLock<true> Guard(*SignalsMutex);
+ FilesToRemove->push_back(Filename);
+ }
RegisterHandlers();
return false;
}
// DontRemoveFileOnSignal - The public API
-void llvm::sys::DontRemoveFileOnSignal(const sys::Path &Filename) {
- SignalsMutex.acquire();
- std::vector<sys::Path>::reverse_iterator I =
- std::find(FilesToRemove.rbegin(), FilesToRemove.rend(), Filename);
- if (I != FilesToRemove.rend())
- FilesToRemove.erase(I.base()-1);
- SignalsMutex.release();
+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));
+ 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,
+ StringSaver &StrPool) {
+ 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
+#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.
-static void PrintStackTrace(void *) {
-#ifdef HAVE_BACKTRACE
+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) {
const char* name = strrchr(dlinfo.dli_fname, '/');
int nwidth;
- if (name == NULL) nwidth = strlen(dlinfo.dli_fname);
- else nwidth = strlen(name) - 1;
+ if (!name) nwidth = strlen(dlinfo.dli_fname);
+ else nwidth = strlen(name) - 1;
if (nwidth > width) width = nwidth;
}
Dl_info dlinfo;
dladdr(StackTrace[i], &dlinfo);
- fprintf(stderr, "%-2d", i);
+ OS << format("%-2d", i);
const char* name = strrchr(dlinfo.dli_fname, '/');
- if (name == NULL) fprintf(stderr, " %-*s", width, dlinfo.dli_fname);
- else fprintf(stderr, " %-*s", width, name+1);
+ if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
+ else OS << format(" %-*s", width, name+1);
- fprintf(stderr, " %#0*lx",
- (int)(sizeof(void*) * 2) + 2, (unsigned long)StackTrace[i]);
+ OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
+ (unsigned long)StackTrace[i]);
- if (dlinfo.dli_sname != NULL) {
+ if (dlinfo.dli_sname != nullptr) {
+ OS << ' ';
+# if HAVE_CXXABI_H
int res;
- fputc(' ', stderr);
- char* d = abi::__cxa_demangle(dlinfo.dli_sname, NULL, NULL, &res);
- if (d == NULL) fputs(dlinfo.dli_sname, stderr);
- else fputs(d, stderr);
+ 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);
- fprintf(stderr, " + %tu",(char*)StackTrace[i]-(char*)dlinfo.dli_saddr);
+ // 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));
}
- fputc('\n', stderr);
+ OS << '\n';
}
#else
backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
#endif
}
-/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
+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() {
- AddSignalHandler(PrintStackTrace, 0);
+void llvm::sys::PrintStackTraceOnErrorSignal(bool DisableCrashReporting) {
+ AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
-#if defined(__APPLE__)
+#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
// Environment variable to disable any kind of crash dialog.
- if (getenv("LLVM_DISABLE_CRASH_REPORT")) {
+ 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,
+ kern_return_t ret = task_set_exception_ports(self,
mask,
MACH_PORT_NULL,
- EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
+ EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
THREAD_STATE_NONE);
(void)ret;
}
// the same linkage unit by just defining our own versions of the assert handler
// and abort.
-#ifdef __APPLE__
+#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
#include <signal.h>
#include <pthread.h>
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