1 /* Copyright (c) 2005-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
16 #include <xbt/backtrace.hpp>
17 #include <xbt/config.hpp>
19 #include <xbt/exception.hpp>
21 #include <xbt/log.hpp>
23 XBT_LOG_EXTERNAL_CATEGORY(xbt);
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_exception, xbt, "Exceptions");
29 WithContextException::~WithContextException() = default;
32 e_xbt_log_priority_t prio,
33 const char* context, std::exception const& exception)
36 auto name = simgrid::xbt::demangle(typeid(exception).name());
38 auto* with_context = dynamic_cast<const simgrid::xbt::WithContextException*>(&exception);
39 if (with_context != nullptr)
40 XBT_LOG(prio, "%s %s by %s/%d: %s",
42 with_context->processName().c_str(), with_context->pid(),
45 XBT_LOG(prio, "%s %s: %s", context, name.get(), exception.what());
47 // Do we have a backtrace?
48 if (with_context != nullptr && not simgrid::config::get_value<bool>("exception/cutpath")) {
49 auto backtrace = simgrid::xbt::resolveBacktrace(
50 with_context->backtrace().data(), with_context->backtrace().size());
51 for (std::string const& s : backtrace)
52 XBT_LOG(prio, " -> %s", s.c_str());
55 // Do we have a nested exception?
56 auto* with_nested = dynamic_cast<const std::nested_exception*>(&exception);
57 if (with_nested == nullptr || with_nested->nested_ptr() == nullptr)
60 with_nested->rethrow_nested();
62 catch (std::exception& nested_exception) {
63 logException(prio, "Caused by", nested_exception);
65 // We could catch nested_exception or WithContextException but we don't bother:
67 XBT_LOG(prio, "Caused by an unknown exception");
71 // Don't log exceptions we got when trying to log exception
75 static void showBacktrace(std::vector<xbt_backtrace_location_t>& bt)
77 if (simgrid::config::get_value<bool>("exception/cutpath")) {
78 XBT_LOG(xbt_log_priority_critical, "Display of current backtrace disabled by --cfg=exception/cutpath.");
81 std::vector<std::string> res = resolveBacktrace(&bt[0], bt.size());
82 XBT_LOG(xbt_log_priority_critical, "Current backtrace:");
83 for (std::string const& s : res)
84 XBT_LOG(xbt_log_priority_critical, " -> %s", s.c_str());
87 static std::terminate_handler previous_terminate_handler = nullptr;
91 // Avoid doing crazy things if we get an uncaught exception inside
92 // an uncaught exception
93 static std::atomic_flag lock = ATOMIC_FLAG_INIT;
94 if (lock.test_and_set()) {
95 XBT_ERROR("Handling an exception raised an exception. Bailing out.");
99 // Get the current backtrace and exception
100 auto e = std::current_exception();
101 auto bt = backtrace();
103 std::rethrow_exception(e);
106 // We manage C++ exception ourselves
107 catch (std::exception& e) {
108 logException(xbt_log_priority_critical, "Uncaught exception", e);
113 // We don't know how to manage other exceptions
115 // If there was another handler let's delegate to it
116 if (previous_terminate_handler)
117 previous_terminate_handler();
119 XBT_ERROR("Unknown uncaught exception");
127 void installExceptionHandler()
129 static std::once_flag handler_flag;
130 std::call_once(handler_flag, [] {
131 previous_terminate_handler = std::set_terminate(handler);