1 /* Copyright (c) 2005-2017. 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/config.hpp>
20 #include <xbt/exception.hpp>
22 #include <xbt/log.hpp>
25 XBT_LOG_EXTERNAL_CATEGORY(xbt);
26 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_exception, xbt, "Exceptions");
32 WithContextException::~WithContextException() = default;
35 e_xbt_log_priority_t prio,
36 const char* context, std::exception const& exception)
39 auto name = simgrid::xbt::demangle(typeid(exception).name());
42 dynamic_cast<const simgrid::xbt::WithContextException*>(&exception);
43 if (with_context != nullptr)
44 XBT_LOG(prio, "%s %s by %s/%d: %s",
46 with_context->processName().c_str(), with_context->pid(),
49 XBT_LOG(prio, "%s %s: %s", context, name.get(), exception.what());
51 // Do we have a backtrace?
52 if (with_context != nullptr && not xbt_cfg_get_boolean("exception/cutpath")) {
53 auto backtrace = simgrid::xbt::resolveBacktrace(
54 with_context->backtrace().data(), with_context->backtrace().size());
55 for (std::string const& s : backtrace)
56 XBT_LOG(prio, " -> %s", s.c_str());
59 // Do we have a nested exception?
60 auto with_nested = dynamic_cast<const std::nested_exception*>(&exception);
61 if (with_nested == nullptr || with_nested->nested_ptr() == nullptr)
64 with_nested->rethrow_nested();
66 catch (std::exception& nested_exception) {
67 logException(prio, "Caused by", nested_exception);
69 // We could catch nested_exception or WithContextException but we don't bother:
71 XBT_LOG(prio, "Caused by an unknown exception");
75 // Don't log exceptions we got when trying to log exception
79 static void showBacktrace(std::vector<xbt_backtrace_location_t>& bt)
81 if (xbt_cfg_get_boolean("exception/cutpath")) {
82 XBT_LOG(xbt_log_priority_critical, "Display of current backtrace disabled by --cfg=exception/cutpath.");
85 std::vector<std::string> res = resolveBacktrace(&bt[0], bt.size());
86 XBT_LOG(xbt_log_priority_critical, "Current backtrace:");
87 for (std::string const& s : res)
88 XBT_LOG(xbt_log_priority_critical, " -> %s", s.c_str());
91 static std::terminate_handler previous_terminate_handler = nullptr;
95 // Avoid doing crazy things if we get an uncaught exception inside
96 // an uncaught exception
97 static std::atomic_flag lock = ATOMIC_FLAG_INIT;
98 if (lock.test_and_set()) {
99 XBT_ERROR("Handling an exception raised an exception. Bailing out.");
103 // Get the current backtrace and exception
104 auto e = std::current_exception();
105 auto bt = backtrace();
107 std::rethrow_exception(e);
110 // We manage C++ exception ourselves
111 catch (std::exception& e) {
112 logException(xbt_log_priority_critical, "Uncaught exception", e);
117 // We don't know how to manage other exceptions
119 // If there was another handler let's delegate to it
120 if (previous_terminate_handler)
121 previous_terminate_handler();
123 XBT_ERROR("Unknown uncaught exception");
131 void installExceptionHandler()
133 static std::once_flag handler_flag;
134 std::call_once(handler_flag, [] {
135 previous_terminate_handler = std::set_terminate(handler);