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>
24 XBT_LOG_EXTERNAL_CATEGORY(xbt);
25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_exception, xbt, "Exceptions");
31 WithContextException::~WithContextException() = default;
34 e_xbt_log_priority_t prio,
35 const char* context, std::exception const& exception)
38 auto name = simgrid::xbt::demangle(typeid(exception).name());
40 auto* with_context = 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 && not xbt_cfg_get_boolean("exception/cutpath")) {
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 if (xbt_cfg_get_boolean("exception/cutpath")) {
80 XBT_LOG(xbt_log_priority_critical, "Display of current backtrace disabled by --cfg=exception/cutpath.");
83 std::vector<std::string> res = resolveBacktrace(&bt[0], bt.size());
84 XBT_LOG(xbt_log_priority_critical, "Current backtrace:");
85 for (std::string const& s : res)
86 XBT_LOG(xbt_log_priority_critical, " -> %s", s.c_str());
89 static std::terminate_handler previous_terminate_handler = nullptr;
93 // Avoid doing crazy things if we get an uncaught exception inside
94 // an uncaught exception
95 static std::atomic_flag lock = ATOMIC_FLAG_INIT;
96 if (lock.test_and_set()) {
97 XBT_ERROR("Handling an exception raised an exception. Bailing out.");
101 // Get the current backtrace and exception
102 auto e = std::current_exception();
103 auto bt = backtrace();
105 std::rethrow_exception(e);
108 // We manage C++ exception ourselves
109 catch (std::exception& e) {
110 logException(xbt_log_priority_critical, "Uncaught exception", e);
115 // We don't know how to manage other exceptions
117 // If there was another handler let's delegate to it
118 if (previous_terminate_handler)
119 previous_terminate_handler();
121 XBT_ERROR("Unknown uncaught exception");
129 void installExceptionHandler()
131 static std::once_flag handler_flag;
132 std::call_once(handler_flag, [] {
133 previous_terminate_handler = std::set_terminate(handler);