1 /*
2  * Copyright (c) Facebook, Inc. and its affiliates.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <folly/ExceptionString.h>
18 
19 #include <utility>
20 
21 #include <folly/Demangle.h>
22 #include <folly/lang/Exception.h>
23 #include <folly/lang/TypeInfo.h>
24 
25 namespace folly {
26 
27 namespace {
28 
exception_string_type(std::type_info const * ti)29 fbstring exception_string_type(std::type_info const* ti) {
30   return ti ? demangle(*ti) : "<unknown exception>";
31 }
32 
33 } // namespace
34 
35 /**
36  * Debug string for an exception: include type and what(), if
37  * defined.
38  */
exceptionStr(std::exception const & e)39 fbstring exceptionStr(std::exception const& e) {
40   auto prefix = exception_string_type(folly::type_info_of(e));
41   return std::move(prefix) + ": " + e.what();
42 }
43 
exceptionStr(std::exception_ptr const & ep)44 fbstring exceptionStr(std::exception_ptr const& ep) {
45   if (auto ex = exception_ptr_get_object<std::exception>(ep)) {
46     return exceptionStr(*ex);
47   }
48   return exception_string_type(exception_ptr_get_type(ep));
49 }
50 
51 } // namespace folly
52