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c1ac116eb9
Adds a header for utility functions/structures, based on the Itanium ABI for C++, necessary for us to inspect exceptions behind std::exception_ptr without having to actually rethrow the exception.
53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
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/*
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* Copyright (C) 2022-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <unwind.h>
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#include <typeinfo>
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#include <exception>
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// This file defines structures/functions derived from the Itanium C++ ABI.
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// Source: https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
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namespace utils {
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namespace abi {
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// __cxa_exception (exception object header), as defined in section 2.2.1
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struct cxa_exception {
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std::type_info* exceptionType;
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void (*exceptionDestructor)(void*);
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std::unexpected_handler unexpectedHandler;
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std::terminate_handler terminateHandler;
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cxa_exception* nextException;
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int handlerCount;
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int handlerSwitchValue;
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const char* actionRecord;
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const char* languageSpecificData;
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void* catchTemp;
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void* adjustedPtr;
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_Unwind_Exception unwindHeader;
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};
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// Given a pointer to the exception data, returns the pointer
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// to the __cxa_exception header.
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inline cxa_exception* get_cxa_exception(void* eptr) {
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// From section 2.2.1:
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// "By convention, a __cxa_exception pointer points at the C++ object
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// representing the exception being thrown, immediately following
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// the header. The header structure is accessed at a negative offset
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// from the __cxa_exception pointer."
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return reinterpret_cast<cxa_exception*>(eptr) - 1;
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}
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} // abi
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} // utils
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