| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___EXCEPTION_EXCEPTION_H |
| #define _LIBCPP___EXCEPTION_EXCEPTION_H |
| |
| #include <__config> |
| |
| // <vcruntime_exception.h> defines its own std::exception and std::bad_exception types, |
| // which we use in order to be ABI-compatible with other STLs on Windows. |
| #if defined(_LIBCPP_ABI_VCRUNTIME) |
| # include <vcruntime_exception.h> |
| #endif |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| namespace std { // purposefully not using versioning namespace |
| |
| #if defined(_LIBCPP_ABI_VCRUNTIME) && (!defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS != 0) |
| // The std::exception class was already included above, but we're explicit about this condition here for clarity. |
| |
| #elif defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0 |
| // However, <vcruntime_exception.h> does not define std::exception and std::bad_exception |
| // when _HAS_EXCEPTIONS == 0. |
| // |
| // Since libc++ still wants to provide the std::exception hierarchy even when _HAS_EXCEPTIONS == 0 |
| // (after all those are simply types like any other), we define an ABI-compatible version |
| // of the VCRuntime std::exception and std::bad_exception types in that mode. |
| |
| struct __std_exception_data { |
| char const* _What; |
| bool _DoFree; |
| }; |
| |
| class exception { // base of all library exceptions |
| public: |
| exception() _NOEXCEPT : __data_() {} |
| |
| explicit exception(char const* __message) _NOEXCEPT : __data_() { |
| __data_._What = __message; |
| __data_._DoFree = true; |
| } |
| |
| exception(exception const&) _NOEXCEPT {} |
| |
| exception& operator=(exception const&) _NOEXCEPT { return *this; } |
| |
| virtual ~exception() _NOEXCEPT {} |
| |
| virtual char const* what() const _NOEXCEPT { return __data_._What ? __data_._What : "Unknown exception"; } |
| |
| private: |
| __std_exception_data __data_; |
| }; |
| |
| class bad_exception : public exception { |
| public: |
| bad_exception() _NOEXCEPT : exception("bad exception") {} |
| }; |
| |
| #else // !defined(_LIBCPP_ABI_VCRUNTIME) |
| // On all other platforms, we define our own std::exception and std::bad_exception types |
| // regardless of whether exceptions are turned on as a language feature. |
| |
| class _LIBCPP_EXPORTED_FROM_ABI exception { |
| public: |
| _LIBCPP_HIDE_FROM_ABI exception() _NOEXCEPT {} |
| _LIBCPP_HIDE_FROM_ABI exception(const exception&) _NOEXCEPT = default; |
| _LIBCPP_HIDE_FROM_ABI exception& operator=(const exception&) _NOEXCEPT = default; |
| |
| virtual ~exception() _NOEXCEPT; |
| virtual const char* what() const _NOEXCEPT; |
| }; |
| |
| class _LIBCPP_EXPORTED_FROM_ABI bad_exception : public exception { |
| public: |
| _LIBCPP_HIDE_FROM_ABI bad_exception() _NOEXCEPT {} |
| _LIBCPP_HIDE_FROM_ABI bad_exception(const bad_exception&) _NOEXCEPT = default; |
| _LIBCPP_HIDE_FROM_ABI bad_exception& operator=(const bad_exception&) _NOEXCEPT = default; |
| ~bad_exception() _NOEXCEPT override; |
| const char* what() const _NOEXCEPT override; |
| }; |
| #endif // !_LIBCPP_ABI_VCRUNTIME |
| |
| } // namespace std |
| |
| #endif // _LIBCPP___EXCEPTION_EXCEPTION_H |