mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 18:29:46 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11690 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
4.8 KiB
C++
139 lines
4.8 KiB
C++
//===- Signals.cpp - Signal Handling support ------------------------------===//
|
|
//
|
|
// 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 defines some helpful functions for dealing with the possibility of
|
|
// Unix signals occuring 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]);
|
|
|
|
#ifdef HAVE_BACKTRACE
|
|
static void* StackTrace[256];
|
|
#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("/bin/cat", "cat", 0);
|
|
exit(0);
|
|
}
|
|
#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);
|
|
}
|