X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FSignals.cpp;h=a11789372d935d38ac26af1df38f4a11f48f6ada;hb=b21d9aebba7e45ddcbce61dd501000049cefb335;hp=d4e74aa089d876ad936e05ca80ab7984e36c029b;hpb=b9632bee7ca842c2721340c42e18bfd0109ce5aa;p=oota-llvm.git diff --git a/lib/Support/Signals.cpp b/lib/Support/Signals.cpp index d4e74aa089d..a11789372d9 100644 --- a/lib/Support/Signals.cpp +++ b/lib/Support/Signals.cpp @@ -1,138 +1,34 @@ -//===- 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 -#include -#include -#include -#include "Config/config.h" // Get the signal handler return type -#ifdef HAVE_EXECINFO_H -# include // For backtrace(). -#endif -#include -#include -#include -#include -using namespace llvm; +#include "llvm/Support/Signals.h" +#include "llvm/Config/config.h" -static std::vector FilesToRemove; +namespace llvm { +using namespace sys; -// 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]); +//===----------------------------------------------------------------------===// +//=== WARNING: Implementation here must contain only TRULY operating system +//=== independent code. +//===----------------------------------------------------------------------===// -// 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]); +} -#ifdef HAVE_BACKTRACE -static void* StackTrace[256]; +// Include the platform-specific parts of this class. +#ifdef LLVM_ON_UNIX +#include "Unix/Signals.inc" #endif - - -// 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. - - // 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; - 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); - } +#ifdef LLVM_ON_WIN32 +#include "Windows/Signals.inc" #endif -} - -// 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); -}