#include "Unix.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Mutex.h"
-#include <vector>
#include <algorithm>
+#include <string>
+#include <vector>
#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
+
using namespace llvm;
static RETSIGTYPE SignalHandler(int Sig); // defined below.
static 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::string> FilesToRemove;
static std::vector<std::pair<void(*)(void*), void*> > CallBacksToRun;
-// 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]);
+static const int *const IntSigsEnd = std::end(IntSigs);
-// 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 const int *const KillSigsEnd = std::end(KillSigs);
static unsigned NumRegisteredSignals = 0;
static struct {
// 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();
+ // We avoid iterators in case of debug iterators that allocate or release
+ // memory.
+ for (unsigned i = 0, e = FilesToRemove.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 = FilesToRemove[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);
+ sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
SignalsMutex.acquire();
RemoveFilesToRemove();
if (InterruptFunction) {
void (*IF)() = InterruptFunction;
SignalsMutex.release();
- InterruptFunction = 0;
+ InterruptFunction = nullptr;
IF(); // run the interrupt function.
return;
}
// 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);
+
+#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() {
}
// RemoveFileOnSignal - The public API
-bool llvm::sys::RemoveFileOnSignal(const sys::Path &Filename,
+bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
std::string* ErrMsg) {
SignalsMutex.acquire();
+ std::string *OldPtr = FilesToRemove.empty() ? nullptr : &FilesToRemove[0];
FilesToRemove.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 == &FilesToRemove[0])
+ FilesToRemove.back().c_str();
+ else
+ for (unsigned i = 0, e = FilesToRemove.size(); i != e; ++i)
+ FilesToRemove[i].c_str();
+
SignalsMutex.release();
RegisterHandlers();
}
// DontRemoveFileOnSignal - The public API
-void llvm::sys::DontRemoveFileOnSignal(const sys::Path &Filename) {
+void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
SignalsMutex.acquire();
- std::vector<sys::Path>::reverse_iterator I =
+ std::vector<std::string>::reverse_iterator RI =
std::find(FilesToRemove.rbegin(), FilesToRemove.rend(), Filename);
- if (I != FilesToRemove.rend())
- FilesToRemove.erase(I.base()-1);
+ std::vector<std::string>::iterator I = FilesToRemove.end();
+ if (RI != FilesToRemove.rend())
+ I = FilesToRemove.erase(RI.base()-1);
+
+ // We need to call c_str() on every element which would have been moved by
+ // the erase. These elements, in a C++98 implementation where c_str()
+ // requires a reallocation on the first call may have had the call to c_str()
+ // made on insertion become invalid by being copied down an element.
+ for (std::vector<std::string>::iterator E = FilesToRemove.end(); I != E; ++I)
+ I->c_str();
+
SignalsMutex.release();
}
//
// 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(FILE *FD) {
+#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,
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);
+ fprintf(FD, "%-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) fprintf(FD, " %-*s", width, dlinfo.dli_fname);
+ else fprintf(FD, " %-*s", width, name+1);
- fprintf(stderr, " %#0*lx",
+ fprintf(FD, " %#0*lx",
(int)(sizeof(void*) * 2) + 2, (unsigned long)StackTrace[i]);
- if (dlinfo.dli_sname != NULL) {
+ if (dlinfo.dli_sname != nullptr) {
+ fputc(' ', FD);
+# 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) fputs(dlinfo.dli_sname, FD);
+ else fputs(d, FD);
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.
+ fprintf(FD, " + %u",(unsigned)((char*)StackTrace[i]-
+ (char*)dlinfo.dli_saddr));
}
- fputc('\n', stderr);
+ fputc('\n', FD);
}
#else
backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
#endif
}
-/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
+static void PrintStackTraceSignalHandler(void *) {
+ PrintStackTrace(stderr);
+}
+
+/// 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);
+ AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
+
+#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
+ // Environment variable to disable any kind of crash dialog.
+ if (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
}
// 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>
int raise(int sig) {
return pthread_kill(pthread_self(), sig);
abort();
}
-#include <signal.h>
-#include <pthread.h>
-
void abort() {
raise(SIGABRT);
usleep(1000);
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