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Stack backtrace in exceptions (#2100)
- print the backtrace when unexpected exceptions are caught at the top level
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Chris Dodd
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Dec 1, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| /* | ||
| Copyright 2019-present Barefoot Networks, Inc. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
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| #include "backtrace.h" | ||
| #include <stdarg.h> | ||
| #include <functional> | ||
| #include <regex> | ||
| #include <stdexcept> | ||
| #include <typeinfo> | ||
| #include "crash.h" | ||
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| void backtrace_fill_stacktrace(std::string &msg, void *const*backtrace, int size) { | ||
| char **strings = backtrace_symbols(backtrace, size); | ||
| for (int i = 0; i < size; i++) { | ||
| if (strings) { | ||
| msg += "\n "; | ||
| msg += strings[i]; } | ||
| if (const char *line = addr2line(backtrace[i], strings ? strings[i] : 0)) { | ||
| msg += "\n "; | ||
| msg += line; } } | ||
| free(strings); | ||
| } | ||
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| #ifdef __GLIBC__ | ||
| /* DANGER -- overrides for glibc++ exception throwers to include a stack trace. | ||
| * correct functions depends on library internals, so may not work on some versions | ||
| * and will fail with non-GNU libc++ */ | ||
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| void std::__throw_bad_alloc() { | ||
| throw backtrace_exception<std::bad_alloc>(); | ||
| } | ||
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| void std::__throw_bad_cast() { | ||
| throw backtrace_exception<std::bad_cast>(); | ||
| } | ||
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| void std::__throw_bad_function_call() { | ||
| throw backtrace_exception<std::bad_function_call>(); | ||
| } | ||
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| void std::__throw_invalid_argument(char const *m) { | ||
| throw backtrace_exception<std::invalid_argument>(m); | ||
| } | ||
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| void std::__throw_length_error(char const *m) { | ||
| throw backtrace_exception<std::length_error>(m); | ||
| } | ||
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| void std::__throw_logic_error(char const *m) { | ||
| throw backtrace_exception<std::logic_error>(m); | ||
| } | ||
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| void std::__throw_out_of_range(char const *m) { | ||
| throw backtrace_exception<std::out_of_range>(m); | ||
| } | ||
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| void std::__throw_out_of_range_fmt(char const *fmt, ...) { | ||
| char buffer[1024]; // should be large enough for all cases? | ||
| va_list args; | ||
| va_start(args, fmt); | ||
| vsnprintf(buffer, sizeof(buffer), fmt, args); | ||
| va_end(args); | ||
| throw backtrace_exception<std::out_of_range>(buffer); | ||
| } | ||
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| void std::__throw_regex_error(std::regex_constants::error_type err) { | ||
| throw backtrace_exception<std::regex_error>(err); | ||
| } | ||
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| void std::__throw_system_error(int err) { | ||
| throw backtrace_exception<std::system_error>(error_code(err, generic_category())); | ||
| } | ||
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| #endif /* __GLIBC__ */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| Copyright 2019-present Barefoot Networks, Inc. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
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| #ifndef _LIB_BACKTRACE_H_ | ||
| #define _LIB_BACKTRACE_H_ | ||
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| #include <string> | ||
| #include <exception> | ||
| #include "config.h" | ||
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| #if HAVE_EXECINFO_H | ||
| #include <execinfo.h> | ||
| #endif | ||
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| void backtrace_fill_stacktrace(std::string &msg, void *const*backtrace, int size); | ||
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| template<class E> class backtrace_exception : public E { | ||
| static constexpr int buffer_size = 64; | ||
| void *backtrace_buffer[buffer_size]; | ||
| int backtrace_size; | ||
| mutable std::string message; | ||
| public: | ||
| template<class... Args> backtrace_exception(Args... args) : E(std::forward<Args>(args)...) { | ||
| #if HAVE_EXECINFO_H | ||
| backtrace_size = backtrace(backtrace_buffer, buffer_size); | ||
| #else | ||
| backtrace_size = 0; | ||
| #endif | ||
| } | ||
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| const char *what() const noexcept { | ||
| try { | ||
| message = E::what(); | ||
| if (backtrace_size > 0) | ||
| backtrace_fill_stacktrace(message, backtrace_buffer, backtrace_size); | ||
| return message.c_str(); | ||
| } catch(...) {} | ||
| return E::what(); | ||
| } | ||
| }; | ||
|
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| #endif /* _LIB_CRASH_H_ */ |
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