1 /* Copyright (c) 2005-2016. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
17 #include <xbt/backtrace.hpp>
18 #include <xbt/exception.hpp>
20 #include <xbt/log.hpp>
23 XBT_LOG_EXTERNAL_CATEGORY(xbt);
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_exception, xbt, "Exceptions");
30 WithContextException::~WithContextException() = default;
33 e_xbt_log_priority_t prio,
34 const char* context, std::exception const& exception)
37 auto name = simgrid::xbt::demangle(typeid(exception).name());
40 dynamic_cast<const simgrid::xbt::WithContextException*>(&exception);
41 if (with_context != nullptr)
42 XBT_LOG(prio, "%s %s by %s/%d: %s",
44 with_context->processName().c_str(), with_context->pid(),
47 XBT_LOG(prio, "%s %s: %s", context, name.get(), exception.what());
49 // Do we have a backtrace?
50 if (with_context != nullptr) {
51 auto backtrace = simgrid::xbt::resolveBacktrace(
52 with_context->backtrace().data(), with_context->backtrace().size());
53 for (std::string const& s : backtrace)
54 XBT_LOG(prio, " -> %s", s.c_str());
57 // Do we have a nested exception?
58 auto with_nested = dynamic_cast<const std::nested_exception*>(&exception);
59 if (with_nested == nullptr || with_nested->nested_ptr() == nullptr)
62 with_nested->rethrow_nested();
64 catch (std::exception& nested_exception) {
65 logException(prio, "Caused by", nested_exception);
67 // We could catch nested_exception or WithContextException but we don't bother:
69 XBT_LOG(prio, "Caused by an unknown exception");
73 // Don't log exceptions we got when trying to log exception
77 static void showBacktrace(std::vector<xbt_backtrace_location_t>& bt)
79 std::vector<std::string> res = resolveBacktrace(&bt[0], bt.size());
80 XBT_LOG(xbt_log_priority_critical, "Current backtrace:");
81 for (std::string const& s : res)
82 XBT_LOG(xbt_log_priority_critical, " -> %s", s.c_str());
85 static std::terminate_handler previous_terminate_handler = nullptr;
89 // Avoid doing crazy things if we get an uncaught exception inside
90 // an uncaught exception
91 static std::atomic_flag lock = ATOMIC_FLAG_INIT;
92 if (lock.test_and_set()) {
93 XBT_ERROR("Multiple uncaught exceptions");
97 // Get the current backtrace and exception
98 auto e = std::current_exception();
99 auto bt = backtrace();
101 std::rethrow_exception(e);
104 // We manage C++ exception ourselves
105 catch (std::exception& e) {
106 logException(xbt_log_priority_critical, "Uncaught exception", e);
111 // We don't know how to manage other exceptions
113 // If there was another handler let's delegate to it
114 if (previous_terminate_handler)
115 previous_terminate_handler();
117 XBT_ERROR("Unknown uncaught exception");
125 void installExceptionHandler()
127 static std::once_flag handler_flag;
128 std::call_once(handler_flag, [] {
129 previous_terminate_handler = std::set_terminate(handler);