/* messages.c - error reporter -
- Copyright (C) 1987-2016 Free Software Foundation, Inc.
+ Copyright (C) 1987-2017 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
02110-1301, USA. */
#include "as.h"
+#include <signal.h>
+
+/* If the system doesn't provide strsignal, we get it defined in
+ libiberty but no declaration is supplied. Because, reasons. */
+#if !defined (HAVE_STRSIGNAL) && !defined (strsignal)
+extern const char *strsignal (int);
+#endif
static void identify (const char *);
static void as_show_where (void);
static void as_warn_internal (const char *, unsigned int, char *);
static void as_bad_internal (const char *, unsigned int, char *);
+static void signal_crash (int) ATTRIBUTE_NORETURN;
/* Despite the rest of the comments in this file, (FIXME-SOON),
here is the current scheme for error messages etc:
as_tsktsk() is used when we see a minor error for which
our error recovery action is almost certainly correct.
In this case, we print a message and then assembly
- continues as though no error occurred. */
+ continues as though no error occurred.
+
+ as_abort () is used for logic failure (assert or abort, signal).
+*/
static void
identify (const char *file)
xexit (EXIT_FAILURE);
}
-/* Indicate assertion failure.
- Arguments: Filename, line number, optional function name. */
+/* Indicate internal constency error.
+ Arguments: Filename, line number, optional function name.
+ FILENAME may be NULL, which we use for crash-via-signal. */
void
-as_assert (const char *file, int line, const char *fn)
+as_abort (const char *file, int line, const char *fn)
{
as_show_where ();
- fprintf (stderr, _("Internal error!\n"));
- if (fn)
- fprintf (stderr, _("Assertion failure in %s at %s:%d.\n"),
- fn, file, line);
+
+ if (!file)
+ fprintf (stderr, _("Internal error (%s).\n"), fn ? fn : "unknown");
+ else if (fn)
+ fprintf (stderr, _("Internal error in %s at %s:%d.\n"), fn, file, line);
else
- fprintf (stderr, _("Assertion failure at %s:%d.\n"), file, line);
+ fprintf (stderr, _("Internal error at %s:%d.\n"), file, line);
+
fprintf (stderr, _("Please report this bug.\n"));
+
xexit (EXIT_FAILURE);
}
-/* as_abort: Print a friendly message saying how totally hosed we are,
- and exit without producing a core file. */
+/* Handler for fatal signals, such as SIGSEGV. */
+
+static void
+signal_crash (int signo)
+{
+ /* Reset, to prevent unbounded recursion. */
+ signal (signo, SIG_DFL);
+
+ as_abort (NULL, 0, strsignal (signo));
+}
+
+/* Register signal handlers, for less abrubt crashes. */
void
-as_abort (const char *file, int line, const char *fn)
+signal_init (void)
{
- as_show_where ();
- if (fn)
- fprintf (stderr, _("Internal error, aborting at %s:%d in %s\n"),
- file, line, fn);
- else
- fprintf (stderr, _("Internal error, aborting at %s:%d\n"),
- file, line);
- fprintf (stderr, _("Please report this bug.\n"));
- xexit (EXIT_FAILURE);
+#ifdef SIGSEGV
+ signal (SIGSEGV, signal_crash);
+#endif
+#ifdef SIGILL
+ signal (SIGILL, signal_crash);
+#endif
+#ifdef SIGBUS
+ signal (SIGBUS, signal_crash);
+#endif
+#ifdef SIGABRT
+ signal (SIGABRT, signal_crash);
+#endif
+#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
+ signal (SIGIOT, signal_crash);
+#endif
+#ifdef SIGFPE
+ signal (SIGFPE, signal_crash);
+#endif
}
/* Support routines. */