1  //===------------------------- cxa_exception.cpp --------------------------===//
 2  //
 3  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4  // See https://llvm.org/LICENSE.txt for license information.
 5  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6  //
 7  //
 8  //  This file implements the "Exception Handling APIs"
 9  //  https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
10  //
11  //===----------------------------------------------------------------------===//
12  
13  // Support functions for the no-exceptions libc++ library
14  
15  #include "cxxabi.h"
16  
17  #include <exception>        // for std::terminate
18  #include "cxa_exception.h"
19  #include "cxa_handlers.h"
20  
21  namespace __cxxabiv1 {
22  
23  extern "C" {
24  
25  void
26  __cxa_increment_exception_refcount(void *thrown_object) throw() {
27      if (thrown_object != nullptr)
28          std::terminate();
29  }
30  
31  void
32  __cxa_decrement_exception_refcount(void *thrown_object) throw() {
33      if (thrown_object != nullptr)
34        std::terminate();
35  }
36  
37  
38  void *__cxa_current_primary_exception() throw() { return nullptr; }
39  
40  void
41  __cxa_rethrow_primary_exception(void* thrown_object) {
42      if (thrown_object != nullptr)
43        std::terminate();
44  }
45  
46  bool
47  __cxa_uncaught_exception() throw() { return false; }
48  
49  unsigned int
50  __cxa_uncaught_exceptions() throw() { return 0; }
51  
52  }  // extern "C"
53  
54  // provide dummy implementations for the 'no exceptions' case.
55  uint64_t __getExceptionClass  (const _Unwind_Exception*)           { return 0; }
56  void     __setExceptionClass  (      _Unwind_Exception*, uint64_t) {}
57  bool     __isOurExceptionClass(const _Unwind_Exception*)           { return false; }
58  
59  }  // abi