chromium/third_party/libc++abi/src/src/cxa_exception.h

//===----------------------------------------------------------------------===//
//
// 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
//
//
//  This file implements the "Exception Handling APIs"
//  https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
//
//===----------------------------------------------------------------------===//

#ifndef _CXA_EXCEPTION_H
#define _CXA_EXCEPTION_H

#include <exception> // for std::unexpected_handler and std::terminate_handler
#include "cxxabi.h"
#include "unwind.h"

namespace __cxxabiv1 {

static const uint64_t kOurExceptionClass          = …; // CLNGC++\0
static const uint64_t kOurDependentExceptionClass = …; // CLNGC++\1
static const uint64_t get_vendor_and_language     = …; // mask for CLNGC++

_LIBCXXABI_HIDDEN uint64_t __getExceptionClass  (const _Unwind_Exception*);
_LIBCXXABI_HIDDEN void     __setExceptionClass  (      _Unwind_Exception*, uint64_t);
_LIBCXXABI_HIDDEN bool     __isOurExceptionClass(const _Unwind_Exception*);

struct _LIBCXXABI_HIDDEN __cxa_exception { … };

// http://sourcery.mentor.com/archives/cxx-abi-dev/msg01924.html
// The layout of this structure MUST match the layout of __cxa_exception, with
// primaryException instead of referenceCount.
struct _LIBCXXABI_HIDDEN __cxa_dependent_exception { … };

// Verify the negative offsets of different fields.
static_assert …;
static_assert …;

#if defined(_LIBCXXABI_ARM_EHABI)
static_assert(offsetof(__cxa_exception, propagationCount) +
                      sizeof(_Unwind_Exception) + sizeof(void*) ==
                  sizeof(__cxa_exception),
              "propagationCount has wrong negative offset");
static_assert(offsetof(__cxa_dependent_exception, propagationCount) +
                      sizeof(_Unwind_Exception) + sizeof(void*) ==
                  sizeof(__cxa_dependent_exception),
              "propagationCount has wrong negative offset");
#elif defined(__LP64__) || defined(_WIN64)
static_assert …;
static_assert …;
#else
static_assert(offsetof(__cxa_exception, referenceCount) +
                      sizeof(_Unwind_Exception) + sizeof(void*) ==
                  sizeof(__cxa_exception),
              "referenceCount has wrong negative offset");
static_assert(offsetof(__cxa_dependent_exception, primaryException) +
                      sizeof(_Unwind_Exception) + sizeof(void*) ==
                  sizeof(__cxa_dependent_exception),
              "primaryException has wrong negative offset");
#endif

struct _LIBCXXABI_HIDDEN __cxa_eh_globals { … };

extern "C" _LIBCXXABI_FUNC_VIS __cxa_eh_globals * __cxa_get_globals      ();
extern "C" _LIBCXXABI_FUNC_VIS __cxa_eh_globals * __cxa_get_globals_fast ();

extern "C" _LIBCXXABI_FUNC_VIS void * __cxa_allocate_dependent_exception ();
extern "C" _LIBCXXABI_FUNC_VIS void __cxa_free_dependent_exception (void * dependent_exception);

}  // namespace __cxxabiv1

#endif // _CXA_EXCEPTION_H