-//===- Signals.cpp - Signal Handling support ------------------------------===//
-//
+//===- Signals.cpp - Signal Handling support --------------------*- C++ -*-===//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// 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 occuring while your program is running.
+// Unix signals occurring while your program is running.
//
//===----------------------------------------------------------------------===//
-#include "Support/Signals.h"
-#include <vector>
-#include <algorithm>
-#include <cstdlib>
-#include <cstdio>
-#include "Config/config.h" // Get the signal handler return type
-#ifdef HAVE_EXECINFO_H
-# include <execinfo.h> // For backtrace().
-#endif
-#include <signal.h>
-#include <unistd.h>
-#include <sys/wait.h>
-#include <cerrno>
-using namespace llvm;
-
-static std::vector<std::string> FilesToRemove;
-
-// IntSigs - Signals that may interrupt the program at any time.
-static const int IntSigs[] = {
- SIGHUP, SIGINT, SIGQUIT, SIGKILL, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
-};
-static const int *IntSigsEnd = IntSigs + sizeof(IntSigs)/sizeof(IntSigs[0]);
-
-// KillSigs - Signals that are synchronous with the program that will cause it
-// to die.
-static const int KillSigs[] = {
- SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ
-#ifdef SIGEMT
- , SIGEMT
-#endif
-};
-static const int *KillSigsEnd = KillSigs + sizeof(KillSigs)/sizeof(KillSigs[0]);
+#include "llvm/Config/config.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Signals.h"
-#ifdef HAVE_BACKTRACE
-static void* StackTrace[256];
-#endif
+#include <vector>
+namespace llvm {
+using namespace sys;
-// 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. In order to backtrace symbols, we fork and exec a
-// 'c++filt' process to do the demangling. This seems like the simplest and
-// most robust solution when we can't allocate memory (such as in a signal
-// handler). If we can't find 'c++filt', we fallback to printing mangled names.
-//
-static void PrintStackTrace() {
-#ifdef HAVE_BACKTRACE
- // Use backtrace() to output a backtrace on Linux systems with glibc.
- int depth = backtrace(StackTrace, sizeof(StackTrace)/sizeof(StackTrace[0]));
-
- // Create a one-way unix pipe. The backtracing process writes to PipeFDs[1],
- // the c++filt process reads from PipeFDs[0].
- int PipeFDs[2];
- if (pipe(PipeFDs)) {
- backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
- return;
- }
-
- switch (pid_t ChildPID = fork()) {
- case -1: // Error forking, print mangled stack trace
- close(PipeFDs[0]);
- close(PipeFDs[1]);
- backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
- return;
- default: // backtracing process
- close(PipeFDs[0]); // Close the reader side.
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//=== independent code.
+//===----------------------------------------------------------------------===//
- // Print the mangled backtrace into the pipe.
- backtrace_symbols_fd(StackTrace, depth, PipeFDs[1]);
- close(PipeFDs[1]); // We are done writing.
- while (waitpid(ChildPID, 0, 0) == -1)
- if (errno != EINTR) break;
+static ManagedStatic<std::vector<std::pair<void (*)(void *), void *>>>
+ CallBacksToRun;
+void sys::RunSignalHandlers() {
+ if (!CallBacksToRun.isConstructed())
return;
-
- case 0: // c++filt process
- close(PipeFDs[1]); // Close the writer side.
- dup2(PipeFDs[0], 0); // Read from standard input
- close(PipeFDs[0]); // Close the old descriptor
- dup2(2, 1); // Revector stdout -> stderr
-
- // Try to run c++filt or gc++filt. If neither is found, call back on 'cat'
- // to print the mangled stack trace. If we can't find cat, just exit.
- execlp("c++filt", "c++filt", 0);
- execlp("gc++filt", "gc++filt", 0);
- execlp("cat", "cat", 0);
- execlp("/usr/bin/cat", "cat", 0);
- exit(0);
- }
-#endif
+ for (auto &I : *CallBacksToRun)
+ I.first(I.second);
+ CallBacksToRun->clear();
}
-
-// SignalHandler - The signal handler that runs...
-static RETSIGTYPE SignalHandler(int Sig) {
- while (!FilesToRemove.empty()) {
- std::remove(FilesToRemove.back().c_str());
- FilesToRemove.pop_back();
- }
-
- if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd)
- exit(1); // If this is an interrupt signal, exit the program
-
- // Otherwise if it is a fault (like SEGV) output the stacktrace to
- // STDERR (if we can) and reissue the signal to die...
- PrintStackTrace();
- signal(Sig, SIG_DFL);
}
-static void RegisterHandler(int Signal) { signal(Signal, SignalHandler); }
-
-// RemoveFileOnSignal - The public API
-void llvm::RemoveFileOnSignal(const std::string &Filename) {
- FilesToRemove.push_back(Filename);
-
- std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
- std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
-}
-
-/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
-/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
-void llvm::PrintStackTraceOnErrorSignal() {
- std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
-}
+// Include the platform-specific parts of this class.
+#ifdef LLVM_ON_UNIX
+#include "Unix/Signals.inc"
+#endif
+#ifdef LLVM_ON_WIN32
+#include "Windows/Signals.inc"
+#endif
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