#include "gdbsupport/gdb_setjmp.h"
#include "safe-ctype.h"
#include "gdbsupport/selftest.h"
+#include "gdbsupport/gdb-sigmask.h"
+#include <atomic>
+#include "event-top.h"
+#include "run-on-main-thread.h"
#define d_left(dc) (dc)->u.s_binary.left
#define d_right(dc) (dc)->u.s_binary.right
/* skip any symbols that we've already considered. */
for (symbol *listed_sym : *overload_list)
- if (strcmp (SYMBOL_LINKAGE_NAME (sym),
- SYMBOL_LINKAGE_NAME (listed_sym)) == 0)
+ if (strcmp (sym->linkage_name (), listed_sym->linkage_name ()) == 0)
return;
/* Get the demangled name without parameters */
gdb::unique_xmalloc_ptr<char> sym_name
- = cp_remove_params (SYMBOL_NATURAL_NAME (sym));
+ = cp_remove_params (sym->natural_name ());
if (!sym_name)
return;
/* Stack context and environment for demangler crash recovery. */
-static SIGJMP_BUF gdb_demangle_jmp_buf;
+static thread_local SIGJMP_BUF *gdb_demangle_jmp_buf;
-/* If nonzero, attempt to dump core from the signal handler. */
+/* If true, attempt to dump core from the signal handler. */
-static int gdb_demangle_attempt_core_dump = 1;
+static std::atomic<bool> gdb_demangle_attempt_core_dump;
/* Signal handler for gdb_demangle. */
if (fork () == 0)
dump_core ();
- gdb_demangle_attempt_core_dump = 0;
+ gdb_demangle_attempt_core_dump = false;
}
- SIGLONGJMP (gdb_demangle_jmp_buf, signo);
+ SIGLONGJMP (*gdb_demangle_jmp_buf, signo);
+}
+
+/* A helper for gdb_demangle that reports a demangling failure. */
+
+static void
+report_failed_demangle (const char *name, bool core_dump_allowed,
+ int crash_signal)
+{
+ static bool error_reported = false;
+
+ if (!error_reported)
+ {
+ std::string short_msg
+ = string_printf (_("unable to demangle '%s' "
+ "(demangler failed with signal %d)"),
+ name, crash_signal);
+
+ std::string long_msg
+ = string_printf ("%s:%d: %s: %s", __FILE__, __LINE__,
+ "demangler-warning", short_msg.c_str ());
+
+ target_terminal::scoped_restore_terminal_state term_state;
+ target_terminal::ours_for_output ();
+
+ begin_line ();
+ if (core_dump_allowed)
+ fprintf_unfiltered (gdb_stderr,
+ _("%s\nAttempting to dump core.\n"),
+ long_msg.c_str ());
+ else
+ warn_cant_dump_core (long_msg.c_str ());
+
+ demangler_warning (__FILE__, __LINE__, "%s", short_msg.c_str ());
+
+ error_reported = true;
+ }
}
#endif
int crash_signal = 0;
#ifdef HAVE_WORKING_FORK
-#if defined (HAVE_SIGACTION) && defined (SA_RESTART)
- struct sigaction sa, old_sa;
-#else
- sighandler_t ofunc;
-#endif
- static int core_dump_allowed = -1;
-
- if (core_dump_allowed == -1)
- {
- core_dump_allowed = can_dump_core (LIMIT_CUR);
-
- if (!core_dump_allowed)
- gdb_demangle_attempt_core_dump = 0;
- }
-
+ scoped_restore restore_segv
+ = make_scoped_restore (&thread_local_segv_handler,
+ catch_demangler_crashes
+ ? gdb_demangle_signal_handler
+ : nullptr);
+
+ bool core_dump_allowed = gdb_demangle_attempt_core_dump;
+ SIGJMP_BUF jmp_buf;
+ scoped_restore restore_jmp_buf
+ = make_scoped_restore (&gdb_demangle_jmp_buf, &jmp_buf);
if (catch_demangler_crashes)
{
-#if defined (HAVE_SIGACTION) && defined (SA_RESTART)
- sa.sa_handler = gdb_demangle_signal_handler;
- sigemptyset (&sa.sa_mask);
-#ifdef HAVE_SIGALTSTACK
- sa.sa_flags = SA_ONSTACK;
-#else
- sa.sa_flags = 0;
-#endif
- sigaction (SIGSEGV, &sa, &old_sa);
-#else
- ofunc = signal (SIGSEGV, gdb_demangle_signal_handler);
-#endif
-
/* The signal handler may keep the signal blocked when we longjmp out
of it. If we have sigprocmask, we can use it to unblock the signal
afterwards and we can avoid the performance overhead of saving the
signal mask just in case the signal gets triggered. Otherwise, just
tell sigsetjmp to save the mask. */
#ifdef HAVE_SIGPROCMASK
- crash_signal = SIGSETJMP (gdb_demangle_jmp_buf, 0);
+ crash_signal = SIGSETJMP (*gdb_demangle_jmp_buf, 0);
#else
- crash_signal = SIGSETJMP (gdb_demangle_jmp_buf, 1);
+ crash_signal = SIGSETJMP (*gdb_demangle_jmp_buf, 1);
#endif
}
#endif
#ifdef HAVE_WORKING_FORK
if (catch_demangler_crashes)
{
-#if defined (HAVE_SIGACTION) && defined (SA_RESTART)
- sigaction (SIGSEGV, &old_sa, NULL);
-#else
- signal (SIGSEGV, ofunc);
-#endif
-
if (crash_signal != 0)
- {
- static int error_reported = 0;
-
+ {
#ifdef HAVE_SIGPROCMASK
/* If we got the signal, SIGSEGV may still be blocked; restore it. */
sigset_t segv_sig_set;
sigemptyset (&segv_sig_set);
sigaddset (&segv_sig_set, SIGSEGV);
- sigprocmask (SIG_UNBLOCK, &segv_sig_set, NULL);
+ gdb_sigmask (SIG_UNBLOCK, &segv_sig_set, NULL);
#endif
- if (!error_reported)
- {
- std::string short_msg
- = string_printf (_("unable to demangle '%s' "
- "(demangler failed with signal %d)"),
- name, crash_signal);
-
- std::string long_msg
- = string_printf ("%s:%d: %s: %s", __FILE__, __LINE__,
- "demangler-warning", short_msg.c_str ());
-
- target_terminal::scoped_restore_terminal_state term_state;
- target_terminal::ours_for_output ();
-
- begin_line ();
- if (core_dump_allowed)
- fprintf_unfiltered (gdb_stderr,
- _("%s\nAttempting to dump core.\n"),
- long_msg.c_str ());
- else
- warn_cant_dump_core (long_msg.c_str ());
-
- demangler_warning (__FILE__, __LINE__, "%s", short_msg.c_str ());
-
- error_reported = 1;
- }
-
- result = NULL;
- }
+ /* If there was a failure, we can't report it here, because
+ we might be in a background thread. Instead, arrange for
+ the reporting to happen on the main thread. */
+ std::string copy = name;
+ run_on_main_thread ([=] ()
+ {
+ report_failed_demangle (copy.c_str (), core_dump_allowed,
+ crash_signal);
+ });
+
+ result = NULL;
+ }
}
#endif
namespace selftests {
-void
+static void
test_cp_symbol_name_matches ()
{
#define CHECK_MATCH(SYMBOL, INPUT) \
quote (const char *str)
{
if (str != NULL)
- return std::string (1, '\"') + str + '\"';
+ return std::string (1, '"') + str + '"';
else
return "<null>";
}
NULL,
&maintenance_set_cmdlist,
&maintenance_show_cmdlist);
+
+ gdb_demangle_attempt_core_dump = can_dump_core (LIMIT_CUR);
#endif
#if GDB_SELF_TEST
projects / deliverable / binutils-gdb.git / blobdiff