-/* Copyright (c) 2005-2016. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2005-2018. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
+#include <cstdlib>
+
+#include <atomic>
#include <exception>
+#include <string>
#include <typeinfo>
+#include <vector>
#include <memory>
+#include <mutex>
#include <xbt/backtrace.hpp>
+#include <xbt/config.hpp>
+#include <xbt/ex.hpp>
#include <xbt/exception.hpp>
#include <xbt/log.h>
#include <xbt/log.hpp>
-extern "C" {
XBT_LOG_EXTERNAL_CATEGORY(xbt);
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_exception, xbt, "Exceptions");
-}
namespace simgrid {
namespace xbt {
-WithContextException::~WithContextException() {}
+WithContextException::~WithContextException() = default;
-void logException(
- e_xbt_log_priority_t prio,
- const char* context, std::exception const& exception)
+void log_exception(e_xbt_log_priority_t prio, const char* context, std::exception const& exception)
{
try {
auto name = simgrid::xbt::demangle(typeid(exception).name());
- auto with_context =
- dynamic_cast<const simgrid::xbt::WithContextException*>(&exception);
+ auto* with_context = dynamic_cast<const simgrid::xbt::WithContextException*>(&exception);
if (with_context != nullptr)
XBT_LOG(prio, "%s %s by %s/%d: %s",
context, name.get(),
XBT_LOG(prio, "%s %s: %s", context, name.get(), exception.what());
// Do we have a backtrace?
- if (with_context != nullptr) {
- auto backtrace = simgrid::xbt::resolveBacktrace(
- with_context->backtrace().data(), with_context->backtrace().size());
+ if (with_context != nullptr && not simgrid::config::get_value<bool>("exception/cutpath")) {
+ auto backtrace =
+ simgrid::xbt::resolve_backtrace(with_context->backtrace().data(), with_context->backtrace().size());
for (std::string const& s : backtrace)
XBT_LOG(prio, " -> %s", s.c_str());
}
// Do we have a nested exception?
- auto with_nested = dynamic_cast<const std::nested_exception*>(&exception);
+ auto* with_nested = dynamic_cast<const std::nested_exception*>(&exception);
if (with_nested == nullptr || with_nested->nested_ptr() == nullptr)
return;
try {
with_nested->rethrow_nested();
}
catch (std::exception& nested_exception) {
- logException(prio, "Caused by", nested_exception);
+ log_exception(prio, "Caused by", nested_exception);
}
// We could catch nested_exception or WithContextException but we don't bother:
catch (...) {
}
}
+static void showBacktrace(std::vector<xbt_backtrace_location_t>& bt)
+{
+ if (simgrid::config::get_value<bool>("exception/cutpath")) {
+ XBT_LOG(xbt_log_priority_critical, "Display of current backtrace disabled by --cfg=exception/cutpath.");
+ return;
+ }
+ std::vector<std::string> res = resolve_backtrace(&bt[0], bt.size());
+ XBT_LOG(xbt_log_priority_critical, "Current backtrace:");
+ for (std::string const& s : res)
+ XBT_LOG(xbt_log_priority_critical, " -> %s", s.c_str());
}
+
+static std::terminate_handler previous_terminate_handler = nullptr;
+
+static void handler()
+{
+ // Avoid doing crazy things if we get an uncaught exception inside
+ // an uncaught exception
+ static std::atomic_flag lock = ATOMIC_FLAG_INIT;
+ if (lock.test_and_set()) {
+ XBT_ERROR("Handling an exception raised an exception. Bailing out.");
+ std::abort();
+ }
+
+ // Get the current backtrace and exception
+ auto e = std::current_exception();
+ auto bt = backtrace();
+ try {
+ std::rethrow_exception(e);
+ }
+
+ // We manage C++ exception ourselves
+ catch (std::exception& e) {
+ log_exception(xbt_log_priority_critical, "Uncaught exception", e);
+ showBacktrace(bt);
+ std::abort();
+ }
+
+ // We don't know how to manage other exceptions
+ catch (...) {
+ // If there was another handler let's delegate to it
+ if (previous_terminate_handler)
+ previous_terminate_handler();
+ else {
+ XBT_ERROR("Unknown uncaught exception");
+ showBacktrace(bt);
+ std::abort();
+ }
+ }
+
+}
+
+void install_exception_handler()
+{
+ static std::once_flag handler_flag;
+ std::call_once(handler_flag, [] {
+ previous_terminate_handler = std::set_terminate(handler);
+ });
+}
+// deprecated
+void logException(e_xbt_log_priority_t priority, const char* context, std::exception const& exception)
+{
+ log_exception(priority, context, exception);
+}
+void installExceptionHandler()
+{
+ install_exception_handler();
+}
+
+} // namespace xbt
}
