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While theoratically required in pre-C++11 to avoid re-allocation upon call, C++11 guarantees that c_str() returns a pointer to the internal array so pre-calling c_str() is no longer required. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242983 91177308-0d34-0410-b5e6-96231b3b80d8
527 lines
17 KiB
C++
527 lines
17 KiB
C++
//===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines some helpful functions for dealing with the possibility of
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// Unix signals occurring while your program is running.
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//
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/UniqueLock.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <string>
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#if HAVE_EXECINFO_H
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# include <execinfo.h> // For backtrace().
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_CXXABI_H
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#include <cxxabi.h>
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#endif
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#if HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#if HAVE_MACH_MACH_H
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#include <mach/mach.h>
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#endif
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#if HAVE_LINK_H
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#include <link.h>
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#endif
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using namespace llvm;
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static RETSIGTYPE SignalHandler(int Sig); // defined below.
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static ManagedStatic<SmartMutex<true> > SignalsMutex;
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/// InterruptFunction - The function to call if ctrl-c is pressed.
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static void (*InterruptFunction)() = nullptr;
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static ManagedStatic<std::vector<std::string>> FilesToRemove;
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// IntSigs - Signals that represent requested termination. There's no bug
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// or failure, or if there is, it's not our direct responsibility. For whatever
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// reason, our continued execution is no longer desirable.
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static const int IntSigs[] = {
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SIGHUP, SIGINT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
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};
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// KillSigs - Signals that represent that we have a bug, and our prompt
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// termination has been ordered.
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static const int KillSigs[] = {
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SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGQUIT
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#ifdef SIGSYS
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, SIGSYS
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#endif
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#ifdef SIGXCPU
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, SIGXCPU
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#endif
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#ifdef SIGXFSZ
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, SIGXFSZ
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#endif
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#ifdef SIGEMT
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, SIGEMT
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#endif
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};
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static unsigned NumRegisteredSignals = 0;
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static struct {
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struct sigaction SA;
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int SigNo;
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} RegisteredSignalInfo[(sizeof(IntSigs)+sizeof(KillSigs))/sizeof(KillSigs[0])];
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static void RegisterHandler(int Signal) {
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assert(NumRegisteredSignals <
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sizeof(RegisteredSignalInfo)/sizeof(RegisteredSignalInfo[0]) &&
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"Out of space for signal handlers!");
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struct sigaction NewHandler;
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NewHandler.sa_handler = SignalHandler;
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NewHandler.sa_flags = SA_NODEFER|SA_RESETHAND;
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sigemptyset(&NewHandler.sa_mask);
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// Install the new handler, save the old one in RegisteredSignalInfo.
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sigaction(Signal, &NewHandler,
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&RegisteredSignalInfo[NumRegisteredSignals].SA);
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RegisteredSignalInfo[NumRegisteredSignals].SigNo = Signal;
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++NumRegisteredSignals;
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}
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static void RegisterHandlers() {
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// We need to dereference the signals mutex during handler registration so
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// that we force its construction. This is to prevent the first use being
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// during handling an actual signal because you can't safely call new in a
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// signal handler.
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*SignalsMutex;
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// If the handlers are already registered, we're done.
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if (NumRegisteredSignals != 0) return;
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for (auto S : IntSigs) RegisterHandler(S);
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for (auto S : KillSigs) RegisterHandler(S);
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}
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static void UnregisterHandlers() {
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// Restore all of the signal handlers to how they were before we showed up.
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for (unsigned i = 0, e = NumRegisteredSignals; i != e; ++i)
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sigaction(RegisteredSignalInfo[i].SigNo,
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&RegisteredSignalInfo[i].SA, nullptr);
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NumRegisteredSignals = 0;
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}
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/// RemoveFilesToRemove - Process the FilesToRemove list. This function
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/// should be called with the SignalsMutex lock held.
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/// NB: This must be an async signal safe function. It cannot allocate or free
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/// memory, even in debug builds.
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static void RemoveFilesToRemove() {
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// Avoid constructing ManagedStatic in the signal handler.
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// If FilesToRemove is not constructed, there are no files to remove.
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if (!FilesToRemove.isConstructed())
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return;
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// We avoid iterators in case of debug iterators that allocate or release
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// memory.
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std::vector<std::string>& FilesToRemoveRef = *FilesToRemove;
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for (unsigned i = 0, e = FilesToRemoveRef.size(); i != e; ++i) {
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const char *path = FilesToRemoveRef[i].c_str();
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// Get the status so we can determine if it's a file or directory. If we
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// can't stat the file, ignore it.
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struct stat buf;
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if (stat(path, &buf) != 0)
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continue;
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// If this is not a regular file, ignore it. We want to prevent removal of
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// special files like /dev/null, even if the compiler is being run with the
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// super-user permissions.
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if (!S_ISREG(buf.st_mode))
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continue;
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// Otherwise, remove the file. We ignore any errors here as there is nothing
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// else we can do.
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unlink(path);
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}
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}
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// SignalHandler - The signal handler that runs.
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static RETSIGTYPE SignalHandler(int Sig) {
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// Restore the signal behavior to default, so that the program actually
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// crashes when we return and the signal reissues. This also ensures that if
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// we crash in our signal handler that the program will terminate immediately
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// instead of recursing in the signal handler.
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UnregisterHandlers();
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// Unmask all potentially blocked kill signals.
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sigset_t SigMask;
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sigfillset(&SigMask);
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sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
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{
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unique_lock<SmartMutex<true>> Guard(*SignalsMutex);
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RemoveFilesToRemove();
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if (std::find(std::begin(IntSigs), std::end(IntSigs), Sig)
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!= std::end(IntSigs)) {
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if (InterruptFunction) {
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void (*IF)() = InterruptFunction;
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Guard.unlock();
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InterruptFunction = nullptr;
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IF(); // run the interrupt function.
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return;
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}
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Guard.unlock();
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raise(Sig); // Execute the default handler.
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return;
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}
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}
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// Otherwise if it is a fault (like SEGV) run any handler.
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llvm::sys::RunSignalHandlers();
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#ifdef __s390__
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// On S/390, certain signals are delivered with PSW Address pointing to
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// *after* the faulting instruction. Simply returning from the signal
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// handler would continue execution after that point, instead of
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// re-raising the signal. Raise the signal manually in those cases.
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if (Sig == SIGILL || Sig == SIGFPE || Sig == SIGTRAP)
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raise(Sig);
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#endif
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}
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void llvm::sys::RunInterruptHandlers() {
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sys::SmartScopedLock<true> Guard(*SignalsMutex);
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RemoveFilesToRemove();
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}
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void llvm::sys::SetInterruptFunction(void (*IF)()) {
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{
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sys::SmartScopedLock<true> Guard(*SignalsMutex);
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InterruptFunction = IF;
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}
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RegisterHandlers();
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}
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// RemoveFileOnSignal - The public API
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bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
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std::string* ErrMsg) {
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{
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sys::SmartScopedLock<true> Guard(*SignalsMutex);
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FilesToRemove->push_back(Filename);
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}
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RegisterHandlers();
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return false;
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}
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// DontRemoveFileOnSignal - The public API
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void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
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sys::SmartScopedLock<true> Guard(*SignalsMutex);
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std::vector<std::string>::reverse_iterator RI =
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std::find(FilesToRemove->rbegin(), FilesToRemove->rend(), Filename);
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std::vector<std::string>::iterator I = FilesToRemove->end();
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if (RI != FilesToRemove->rend())
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I = FilesToRemove->erase(RI.base()-1);
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}
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/// AddSignalHandler - Add a function to be called when a signal is delivered
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/// to the process. The handler can have a cookie passed to it to identify
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/// what instance of the handler it is.
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void llvm::sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
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CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
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RegisterHandlers();
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}
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#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
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#if HAVE_LINK_H && (defined(__linux__) || defined(__FreeBSD__) || \
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defined(__FreeBSD_kernel__) || defined(__NetBSD__))
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struct DlIteratePhdrData {
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void **StackTrace;
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int depth;
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bool first;
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const char **modules;
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intptr_t *offsets;
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const char *main_exec_name;
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};
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static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
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DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
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const char *name = data->first ? data->main_exec_name : info->dlpi_name;
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data->first = false;
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for (int i = 0; i < info->dlpi_phnum; i++) {
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const auto *phdr = &info->dlpi_phdr[i];
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if (phdr->p_type != PT_LOAD)
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continue;
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intptr_t beg = info->dlpi_addr + phdr->p_vaddr;
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intptr_t end = beg + phdr->p_memsz;
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for (int j = 0; j < data->depth; j++) {
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if (data->modules[j])
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continue;
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intptr_t addr = (intptr_t)data->StackTrace[j];
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if (beg <= addr && addr < end) {
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data->modules[j] = name;
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data->offsets[j] = addr - info->dlpi_addr;
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}
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}
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}
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return 0;
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}
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static bool findModulesAndOffsets(void **StackTrace, int Depth,
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const char **Modules, intptr_t *Offsets,
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const char *MainExecutableName) {
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DlIteratePhdrData data = {StackTrace, Depth, true,
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Modules, Offsets, MainExecutableName};
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dl_iterate_phdr(dl_iterate_phdr_cb, &data);
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return true;
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}
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#else
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static bool findModulesAndOffsets(void **StackTrace, int Depth,
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const char **Modules, intptr_t *Offsets,
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const char *MainExecutableName) {
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return false;
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}
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#endif
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static bool printSymbolizedStackTrace(void **StackTrace, int Depth,
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llvm::raw_ostream &OS) {
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// FIXME: Subtract necessary number from StackTrace entries to turn return addresses
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// into actual instruction addresses.
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// Use llvm-symbolizer tool to symbolize the stack traces.
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ErrorOr<std::string> LLVMSymbolizerPathOrErr =
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sys::findProgramByName("llvm-symbolizer");
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if (!LLVMSymbolizerPathOrErr)
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return false;
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const std::string &LLVMSymbolizerPath = *LLVMSymbolizerPathOrErr;
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// We don't know argv0 or the address of main() at this point, but try
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// to guess it anyway (it's possible on some platforms).
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std::string MainExecutableName = sys::fs::getMainExecutable(nullptr, nullptr);
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if (MainExecutableName.empty() ||
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MainExecutableName.find("llvm-symbolizer") != std::string::npos)
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return false;
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std::vector<const char *> Modules(Depth, nullptr);
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std::vector<intptr_t> Offsets(Depth, 0);
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if (!findModulesAndOffsets(StackTrace, Depth, Modules.data(), Offsets.data(),
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MainExecutableName.c_str()))
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return false;
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int InputFD;
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SmallString<32> InputFile, OutputFile;
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sys::fs::createTemporaryFile("symbolizer-input", "", InputFD, InputFile);
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sys::fs::createTemporaryFile("symbolizer-output", "", OutputFile);
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FileRemover InputRemover(InputFile.c_str());
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FileRemover OutputRemover(OutputFile.c_str());
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{
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raw_fd_ostream Input(InputFD, true);
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for (int i = 0; i < Depth; i++) {
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if (Modules[i])
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Input << Modules[i] << " " << (void*)Offsets[i] << "\n";
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}
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}
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StringRef InputFileStr(InputFile);
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StringRef OutputFileStr(OutputFile);
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StringRef StderrFileStr;
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const StringRef *Redirects[] = {&InputFileStr, &OutputFileStr,
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&StderrFileStr};
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const char *Args[] = {"llvm-symbolizer", "--functions=linkage", "--inlining",
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"--demangle", nullptr};
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int RunResult =
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sys::ExecuteAndWait(LLVMSymbolizerPath, Args, nullptr, Redirects);
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if (RunResult != 0)
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return false;
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auto OutputBuf = MemoryBuffer::getFile(OutputFile.c_str());
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if (!OutputBuf)
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return false;
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StringRef Output = OutputBuf.get()->getBuffer();
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SmallVector<StringRef, 32> Lines;
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Output.split(Lines, "\n");
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auto CurLine = Lines.begin();
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int frame_no = 0;
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for (int i = 0; i < Depth; i++) {
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if (!Modules[i]) {
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OS << format("#%d %p\n", frame_no++, StackTrace[i]);
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continue;
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}
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// Read pairs of lines (function name and file/line info) until we
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// encounter empty line.
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for (;;) {
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if (CurLine == Lines.end())
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return false;
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StringRef FunctionName = *CurLine++;
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if (FunctionName.empty())
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break;
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OS << format("#%d %p ", frame_no++, StackTrace[i]);
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if (!FunctionName.startswith("??"))
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OS << format("%s ", FunctionName.str().c_str());
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if (CurLine == Lines.end())
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return false;
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StringRef FileLineInfo = *CurLine++;
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if (!FileLineInfo.startswith("??"))
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OS << format("%s", FileLineInfo.str().c_str());
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else
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OS << format("(%s+%p)", Modules[i], (void *)Offsets[i]);
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OS << "\n";
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}
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}
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return true;
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}
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#endif // defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
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// PrintStackTrace - In the case of a program crash or fault, print out a stack
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// trace so that the user has an indication of why and where we died.
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//
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// On glibc systems we have the 'backtrace' function, which works nicely, but
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// doesn't demangle symbols.
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void llvm::sys::PrintStackTrace(raw_ostream &OS) {
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#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
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static void* StackTrace[256];
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// Use backtrace() to output a backtrace on Linux systems with glibc.
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int depth = backtrace(StackTrace,
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static_cast<int>(array_lengthof(StackTrace)));
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if (printSymbolizedStackTrace(StackTrace, depth, OS))
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return;
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#if HAVE_DLFCN_H && __GNUG__
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int width = 0;
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for (int i = 0; i < depth; ++i) {
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Dl_info dlinfo;
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dladdr(StackTrace[i], &dlinfo);
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const char* name = strrchr(dlinfo.dli_fname, '/');
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int nwidth;
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if (!name) nwidth = strlen(dlinfo.dli_fname);
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else nwidth = strlen(name) - 1;
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if (nwidth > width) width = nwidth;
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}
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for (int i = 0; i < depth; ++i) {
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Dl_info dlinfo;
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dladdr(StackTrace[i], &dlinfo);
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OS << format("%-2d", i);
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const char* name = strrchr(dlinfo.dli_fname, '/');
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if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
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else OS << format(" %-*s", width, name+1);
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OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
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(unsigned long)StackTrace[i]);
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if (dlinfo.dli_sname != nullptr) {
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OS << ' ';
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# if HAVE_CXXABI_H
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int res;
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char* d = abi::__cxa_demangle(dlinfo.dli_sname, nullptr, nullptr, &res);
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# else
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char* d = NULL;
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# endif
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if (!d) OS << dlinfo.dli_sname;
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else OS << d;
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free(d);
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// FIXME: When we move to C++11, use %t length modifier. It's not in
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// C++03 and causes gcc to issue warnings. Losing the upper 32 bits of
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// the stack offset for a stack dump isn't likely to cause any problems.
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OS << format(" + %u",(unsigned)((char*)StackTrace[i]-
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(char*)dlinfo.dli_saddr));
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}
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OS << '\n';
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}
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#else
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backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
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#endif
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#endif
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}
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static void PrintStackTraceSignalHandler(void *) {
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PrintStackTrace(llvm::errs());
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}
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void llvm::sys::DisableSystemDialogsOnCrash() {}
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/// PrintStackTraceOnErrorSignal - When an error signal (such as SIGABRT or
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/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
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void llvm::sys::PrintStackTraceOnErrorSignal(bool DisableCrashReporting) {
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AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
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#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
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// Environment variable to disable any kind of crash dialog.
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if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
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mach_port_t self = mach_task_self();
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exception_mask_t mask = EXC_MASK_CRASH;
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kern_return_t ret = task_set_exception_ports(self,
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mask,
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MACH_PORT_NULL,
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EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
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THREAD_STATE_NONE);
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(void)ret;
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}
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#endif
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}
|
|
|
|
|
|
/***/
|
|
|
|
// 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
|