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/********************* */
/*! \file util.cpp
** \verbatim
** Original author: mdeters
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Utilities for the main driver.
**
** Utilities for the main driver.
**/
#include <cstdio>
#include <cstdlib>
#include <cerrno>
#include <exception>
#include <string.h>
#include <signal.h>
#include "util/exception.h"
#include "util/options.h"
#include "util/Assert.h"
#include "util/stats.h"
#include "cvc4autoconfig.h"
#include "main.h"
using CVC4::Exception;
using namespace std;
namespace CVC4 {
namespace main {
/**
* If true, will not spin on segfault even when CVC4_DEBUG is on.
* Useful for nightly regressions, noninteractive performance runs
* etc.
*/
bool segvNoSpin = false;
/** Handler for SIGXCPU, i.e., timeout. */
void timeout_handler(int sig, siginfo_t* info, void*) {
fprintf(stderr, "CVC4 interrupted by timeout.\n");
if(options.statistics) {
StatisticsRegistry::flushStatistics(cerr);
}
abort();
}
/** Handler for SIGINT, i.e., when the user hits control C. */
void sigint_handler(int sig, siginfo_t* info, void*) {
fprintf(stderr, "CVC4 interrupted by user.\n");
if(options.statistics) {
StatisticsRegistry::flushStatistics(cerr);
}
abort();
}
/** Handler for SIGSEGV (segfault). */
void segv_handler(int sig, siginfo_t* info, void*) {
#ifdef CVC4_DEBUG
fprintf(stderr, "CVC4 suffered a segfault in DEBUG mode.\n");
if(segvNoSpin) {
fprintf(stderr, "No-spin requested, aborting...\n");
abort();
} else {
fprintf(stderr, "Spinning so that a debugger can be connected.\n");
fprintf(stderr, "Try: gdb %s %u\n", progName, getpid());
for(;;) {
sleep(60);
}
}
#else /* CVC4_DEBUG */
fprintf(stderr, "CVC4 suffered a segfault.\n");
abort();
#endif /* CVC4_DEBUG */
}
/** Handler for SIGILL (illegal instruction). */
void ill_handler(int sig, siginfo_t* info, void*) {
#ifdef CVC4_DEBUG
fprintf(stderr, "CVC4 executed an illegal instruction in DEBUG mode.\n");
if(segvNoSpin) {
fprintf(stderr, "No-spin requested, aborting...\n");
abort();
} else {
fprintf(stderr, "Spinning so that a debugger can be connected.\n");
fprintf(stderr, "Try: gdb %s %u\n", progName, getpid());
for(;;) {
sleep(60);
}
}
#else /* CVC4_DEBUG */
fprintf(stderr, "CVC4 executed an illegal instruction.\n");
abort();
#endif /* CVC4_DEBUG */
}
static terminate_handler default_terminator;
void cvc4unexpected() {
#ifdef CVC4_DEBUG
fprintf(stderr, "\n"
"CVC4 threw an \"unexpected\" exception (one that wasn't properly "
"specified\nin the throws() specifier for the throwing function)."
"\n\n");
if(CVC4::s_debugLastException == NULL) {
fprintf(stderr,
"The exception is unknown (maybe it's not a CVC4::Exception).\n\n");
} else {
fprintf(stderr, "The exception is:\n%s\n\n",
static_cast<const char*>(CVC4::s_debugLastException));
}
if(segvNoSpin) {
fprintf(stderr, "No-spin requested.\n");
set_terminate(default_terminator);
} else {
fprintf(stderr, "Spinning so that a debugger can be connected.\n");
fprintf(stderr, "Try: gdb %s %u\n", progName, getpid());
for(;;) {
sleep(60);
}
}
#else /* CVC4_DEBUG */
fprintf(stderr, "CVC4 threw an \"unexpected\" exception.\n");
set_terminate(default_terminator);
#endif /* CVC4_DEBUG */
}
void cvc4terminate() {
#ifdef CVC4_DEBUG
fprintf(stderr, "\n"
"CVC4 was terminated by the C++ runtime.\n"
"Perhaps an exception was thrown during stack unwinding. "
"(Don't do that.)\n");
default_terminator();
#else /* CVC4_DEBUG */
fprintf(stderr,
"CVC4 was terminated by the C++ runtime.\n"
"Perhaps an exception was thrown during stack unwinding.\n");
default_terminator();
#endif /* CVC4_DEBUG */
}
/** Initialize the driver. Sets signal handlers for SIGINT and SIGSEGV. */
void cvc4_init() throw() {
struct sigaction act1;
act1.sa_sigaction = sigint_handler;
act1.sa_flags = SA_SIGINFO;
sigemptyset(&act1.sa_mask);
if(sigaction(SIGINT, &act1, NULL)) {
throw Exception(string("sigaction(SIGINT) failure: ") + strerror(errno));
}
struct sigaction act2;
act2.sa_sigaction = timeout_handler;
act2.sa_flags = SA_SIGINFO;
sigemptyset(&act2.sa_mask);
if(sigaction(SIGXCPU, &act2, NULL)) {
throw Exception(string("sigaction(SIGXCPU) failure: ") + strerror(errno));
}
struct sigaction act3;
act3.sa_sigaction = segv_handler;
act3.sa_flags = SA_SIGINFO;
sigemptyset(&act3.sa_mask);
if(sigaction(SIGSEGV, &act3, NULL)) {
throw Exception(string("sigaction(SIGSEGV) failure: ") + strerror(errno));
}
struct sigaction act4;
act4.sa_sigaction = segv_handler;
act4.sa_flags = SA_SIGINFO;
sigemptyset(&act4.sa_mask);
if(sigaction(SIGILL, &act4, NULL)) {
throw Exception(string("sigaction(SIGILL) failure: ") + strerror(errno));
}
set_unexpected(cvc4unexpected);
default_terminator = set_terminate(cvc4terminate);
}
}/* CVC4::main namespace */
}/* CVC4 namespace */
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