highfive/bits/H5Exception_misc.hpp

0001 /*
0002  *  Copyright (c), 2017, Adrien Devresse <adrien.devresse@epfl.ch>
0003  *
0004  *  Distributed under the Boost Software License, Version 1.0.
0005  *    (See accompanying file LICENSE_1_0.txt or copy at
0006  *          http://www.boost.org/LICENSE_1_0.txt)
0007  *
0008  */
0009 #pragma once
0010
0011 #include <cstdlib>
0012 #include <sstream>
0013
0014 #include "h5_wrapper.hpp"
0015 #include "h5e_wrapper.hpp"
0016
0017 namespace HighFive {
0018
0019 struct HDF5ErrMapper {
0020     template <typename ExceptionType>
0021     static inline herr_t stackWalk(unsigned n, const H5E_error2_t* err_desc, void* client_data) {
0022         auto** e_iter = static_cast<ExceptionType**>(client_data);
0023         (void) n;
0024
0025         const char* major_err = detail::nothrow::h5e_get_major(err_desc->maj_num);
0026         const char* minor_err = detail::nothrow::h5e_get_minor(err_desc->min_num);
0027
0028         std::ostringstream oss;
0029         oss << '(' << major_err << ") " << minor_err;
0030
0031         detail::nothrow::h5_free_memory((void*) major_err);
0032         detail::nothrow::h5_free_memory((void*) minor_err);
0033
0034         auto* e = new ExceptionType(oss.str());
0035         e->_err_major = err_desc->maj_num;
0036         e->_err_minor = err_desc->min_num;
0037         (*e_iter)->_next.reset(e);
0038         *e_iter = e;
0039         return 0;
0040     }
0041
0042     template <typename ExceptionType>
0043     [[noreturn]] static inline void ToException(const std::string& prefix_msg) {
0044         hid_t err_stack = H5Eget_current_stack();
0045         if (err_stack >= 0) {
0046             ExceptionType e("");
0047             ExceptionType* e_iter = &e;
0048
0049             detail::nothrow::h5e_walk2(err_stack,
0050                                        H5E_WALK_UPWARD,
0051                                        &HDF5ErrMapper::stackWalk<ExceptionType>,
0052                                        &e_iter);
0053             detail::nothrow::h5e_clear2(err_stack);
0054
0055             const char* next_err_msg = (e.nextException() != NULL) ? (e.nextException()->what())
0056                                                                    : ("");
0057
0058             e.setErrorMsg(prefix_msg + " " + next_err_msg);
0059             throw e;
0060         }
0061         // throw generic error, unrecognized error
0062         throw ExceptionType(prefix_msg + ": Unknown HDF5 error");
0063     }
0064 };
0065
0066 }  // namespace HighFive