mirror of
https://github.com/TREX-CoE/qmckl.git
synced 2024-06-30 00:44:52 +02:00
582 lines
19 KiB
Org Mode
582 lines
19 KiB
Org Mode
#+TITLE: Error handling
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#+SETUPFILE: ../tools/theme.setup
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#+INCLUDE: ../tools/lib.org
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* Headers :noexport:
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#+begin_src c :tangle (eval h_private_type)
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#ifndef QMCKL_ERROR_HPT
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#define QMCKL_ERROR_HPT
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#+end_src
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#+begin_src c :tangle (eval c)
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#elif HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif
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#include <string.h>
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#include <assert.h>
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#include <pthread.h>
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#include <errno.h>
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#include "qmckl.h"
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#include "qmckl_context_private_type.h"
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#+end_src
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#+begin_src c :tangle (eval c_test) :noweb yes
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#include <string.h>
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#include <stdio.h>
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#include "qmckl.h"
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#include "assert.h"
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#include "qmckl_error_private_type.h"
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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int main() {
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qmckl_context context;
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context = qmckl_context_create();
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#+end_src
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#+end_src
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* -
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:PROPERTIES:
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:UNNUMBERED: t
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:END:
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The library should never make the calling programs abort, nor
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perform any input/output operations. This decision has to be taken
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by the developer of the code calling the library.
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All the functions return with an exit code, defined as
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#+NAME: type-exit-code
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#+begin_src c :comments org :tangle (eval h_type)
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typedef int32_t qmckl_exit_code;
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#+end_src
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#+begin_src f90 :comments org :tangle (eval fh_type) :exports none
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integer , parameter :: qmckl_exit_code = c_int32_t
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#+end_src
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The exit code returns the completion status of the function to the
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calling program. When a function call completed successfully,
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~QMCKL_SUCCESS~ is returned. If one of the functions of
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the library fails to complete the requested task, an appropriate
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error code is returned to the program.
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Here is the complete list of exit codes.
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#+NAME: table-exit-codes
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| Macro | Code | Description |
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|-----------------------------+------+------------------------|
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| ~QMCKL_SUCCESS~ | 0 | 'Success' |
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| ~QMCKL_INVALID_ARG_1~ | 1 | 'Invalid argument 1' |
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| ~QMCKL_INVALID_ARG_2~ | 2 | 'Invalid argument 2' |
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| ~QMCKL_INVALID_ARG_3~ | 3 | 'Invalid argument 3' |
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| ~QMCKL_INVALID_ARG_4~ | 4 | 'Invalid argument 4' |
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| ~QMCKL_INVALID_ARG_5~ | 5 | 'Invalid argument 5' |
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| ~QMCKL_INVALID_ARG_6~ | 6 | 'Invalid argument 6' |
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| ~QMCKL_INVALID_ARG_7~ | 7 | 'Invalid argument 7' |
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| ~QMCKL_INVALID_ARG_8~ | 8 | 'Invalid argument 8' |
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| ~QMCKL_INVALID_ARG_9~ | 9 | 'Invalid argument 9' |
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| ~QMCKL_INVALID_ARG_10~ | 10 | 'Invalid argument 10' |
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| ~QMCKL_INVALID_ARG_11~ | 11 | 'Invalid argument 11' |
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| ~QMCKL_INVALID_ARG_12~ | 12 | 'Invalid argument 12' |
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| ~QMCKL_INVALID_ARG_13~ | 13 | 'Invalid argument 13' |
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| ~QMCKL_INVALID_ARG_14~ | 14 | 'Invalid argument 14' |
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| ~QMCKL_INVALID_ARG_15~ | 15 | 'Invalid argument 15' |
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| ~QMCKL_INVALID_ARG_16~ | 16 | 'Invalid argument 16' |
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| ~QMCKL_INVALID_ARG_17~ | 17 | 'Invalid argument 17' |
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| ~QMCKL_INVALID_ARG_18~ | 18 | 'Invalid argument 18' |
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| ~QMCKL_INVALID_ARG_19~ | 19 | 'Invalid argument 19' |
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| ~QMCKL_INVALID_ARG_20~ | 20 | 'Invalid argument 20' |
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| ~QMCKL_FAILURE~ | 101 | 'Failure' |
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| ~QMCKL_ERRNO~ | 102 | strerror(errno) |
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| ~QMCKL_INVALID_CONTEXT~ | 103 | 'Invalid context' |
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| ~QMCKL_ALLOCATION_FAILED~ | 104 | 'Allocation failed' |
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| ~QMCKL_DEALLOCATION_FAILED~ | 105 | 'De-allocation failed' |
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| ~QMCKL_NOT_PROVIDED~ | 106 | 'Not provided' |
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| ~QMCKL_OUT_OF_BOUNDS~ | 107 | 'Index out of bounds' |
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| ~QMCKL_INVALID_EXIT_CODE~ | 108 | 'Invalid exit code' |
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# We need to force Emacs not to indent the Python code:
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# -*- org-src-preserve-indentation: t
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#+begin_src python :var table=table-exit-codes :results drawer :exports none
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""" This script generates the C and Fortran constants for the error
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codes from the org-mode table.
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"""
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result = [ "#+begin_src c :comments org :tangle (eval h_type) :exports none" ]
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for (text, code,_) in table:
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text=text.replace("~","")
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result += [ f"#define {text:30s} ((qmckl_exit_code) {code:d})" ]
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result += [ "#+end_src" ]
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result += [ "" ]
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result += [ "#+begin_src f90 :comments org :tangle (eval fh_type) :exports none" ]
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for (text, code,_) in table:
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text=text.replace("~","")
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result += [ f" integer(qmckl_exit_code), parameter :: {text:30s} = {code:d}" ]
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result += [ "#+end_src" ]
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return '\n'.join(result)
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#+end_src
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#+RESULTS:
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:results:
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#+begin_src c :comments org :tangle (eval h_type) :exports none
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#define QMCKL_SUCCESS ((qmckl_exit_code) 0)
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#define QMCKL_INVALID_ARG_1 ((qmckl_exit_code) 1)
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#define QMCKL_INVALID_ARG_2 ((qmckl_exit_code) 2)
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#define QMCKL_INVALID_ARG_3 ((qmckl_exit_code) 3)
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#define QMCKL_INVALID_ARG_4 ((qmckl_exit_code) 4)
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#define QMCKL_INVALID_ARG_5 ((qmckl_exit_code) 5)
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#define QMCKL_INVALID_ARG_6 ((qmckl_exit_code) 6)
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#define QMCKL_INVALID_ARG_7 ((qmckl_exit_code) 7)
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#define QMCKL_INVALID_ARG_8 ((qmckl_exit_code) 8)
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#define QMCKL_INVALID_ARG_9 ((qmckl_exit_code) 9)
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#define QMCKL_INVALID_ARG_10 ((qmckl_exit_code) 10)
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#define QMCKL_INVALID_ARG_11 ((qmckl_exit_code) 11)
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#define QMCKL_INVALID_ARG_12 ((qmckl_exit_code) 12)
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#define QMCKL_INVALID_ARG_13 ((qmckl_exit_code) 13)
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#define QMCKL_INVALID_ARG_14 ((qmckl_exit_code) 14)
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#define QMCKL_INVALID_ARG_15 ((qmckl_exit_code) 15)
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#define QMCKL_INVALID_ARG_16 ((qmckl_exit_code) 16)
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#define QMCKL_INVALID_ARG_17 ((qmckl_exit_code) 17)
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#define QMCKL_INVALID_ARG_18 ((qmckl_exit_code) 18)
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#define QMCKL_INVALID_ARG_19 ((qmckl_exit_code) 19)
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#define QMCKL_INVALID_ARG_20 ((qmckl_exit_code) 20)
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#define QMCKL_FAILURE ((qmckl_exit_code) 101)
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#define QMCKL_ERRNO ((qmckl_exit_code) 102)
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#define QMCKL_INVALID_CONTEXT ((qmckl_exit_code) 103)
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#define QMCKL_ALLOCATION_FAILED ((qmckl_exit_code) 104)
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#define QMCKL_DEALLOCATION_FAILED ((qmckl_exit_code) 105)
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#define QMCKL_NOT_PROVIDED ((qmckl_exit_code) 106)
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#define QMCKL_OUT_OF_BOUNDS ((qmckl_exit_code) 107)
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#define QMCKL_INVALID_EXIT_CODE ((qmckl_exit_code) 108)
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#+end_src
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#+begin_src f90 :comments org :tangle (eval fh_type) :exports none
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integer(qmckl_exit_code), parameter :: QMCKL_SUCCESS = 0
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_1 = 1
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_2 = 2
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_3 = 3
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_4 = 4
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_5 = 5
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_6 = 6
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_7 = 7
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_8 = 8
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_9 = 9
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_10 = 10
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_11 = 11
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_12 = 12
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_13 = 13
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_14 = 14
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_15 = 15
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_16 = 16
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_17 = 17
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_18 = 18
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_19 = 19
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_ARG_20 = 20
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integer(qmckl_exit_code), parameter :: QMCKL_FAILURE = 101
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integer(qmckl_exit_code), parameter :: QMCKL_ERRNO = 102
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_CONTEXT = 103
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integer(qmckl_exit_code), parameter :: QMCKL_ALLOCATION_FAILED = 104
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integer(qmckl_exit_code), parameter :: QMCKL_DEALLOCATION_FAILED = 105
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integer(qmckl_exit_code), parameter :: QMCKL_NOT_PROVIDED = 106
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integer(qmckl_exit_code), parameter :: QMCKL_OUT_OF_BOUNDS = 107
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integer(qmckl_exit_code), parameter :: QMCKL_INVALID_EXIT_CODE = 108
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#+end_src
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:end:
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The ~qmckl_string_of_error~ converts an exit code into a string. The
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string is assumed to be large enough to contain the error message
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(typically 128 characters).
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* hidden :noexport:
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#+NAME: MAX_STRING_LENGTH
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: 128
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* Decoding errors
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To decode the error messages, ~qmckl_string_of_error~ converts an
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error code into a string.
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#+begin_src c :comments org :tangle (eval h_func) :noweb yes
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const char*
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qmckl_string_of_error (const qmckl_exit_code error);
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#+end_src
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#+begin_src c :comments org :tangle (eval h_private_func) :exports none :noweb yes
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void
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qmckl_string_of_error_f(const qmckl_exit_code error,
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char result[<<MAX_STRING_LENGTH()>>]);
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#+end_src
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The text strings are extracted from the previous table.
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#+NAME:cases
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#+begin_src python :var table=table-exit-codes :exports none :noweb yes
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""" This script extracts the text associated with the error codes
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from the table.
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"""
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result = []
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for (text, code, message) in table:
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text = text.replace("~","")
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message = message.replace("'",'"')
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result += [ f"""case {text}:
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return {message};
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""" ]
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return '\n'.join(result)
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#+end_src
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#+RESULTS: cases
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#+begin_example
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case QMCKL_SUCCESS:
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return "Success";
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case QMCKL_INVALID_ARG_1:
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return "Invalid argument 1";
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case QMCKL_INVALID_ARG_2:
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return "Invalid argument 2";
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case QMCKL_INVALID_ARG_3:
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return "Invalid argument 3";
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case QMCKL_INVALID_ARG_4:
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return "Invalid argument 4";
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case QMCKL_INVALID_ARG_5:
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return "Invalid argument 5";
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case QMCKL_INVALID_ARG_6:
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return "Invalid argument 6";
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case QMCKL_INVALID_ARG_7:
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return "Invalid argument 7";
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case QMCKL_INVALID_ARG_8:
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return "Invalid argument 8";
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case QMCKL_INVALID_ARG_9:
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return "Invalid argument 9";
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case QMCKL_INVALID_ARG_10:
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return "Invalid argument 10";
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case QMCKL_INVALID_ARG_11:
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return "Invalid argument 11";
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case QMCKL_INVALID_ARG_12:
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return "Invalid argument 12";
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case QMCKL_INVALID_ARG_13:
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return "Invalid argument 13";
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case QMCKL_INVALID_ARG_14:
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return "Invalid argument 14";
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case QMCKL_INVALID_ARG_15:
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return "Invalid argument 15";
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case QMCKL_INVALID_ARG_16:
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return "Invalid argument 16";
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case QMCKL_INVALID_ARG_17:
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return "Invalid argument 17";
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case QMCKL_INVALID_ARG_18:
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return "Invalid argument 18";
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case QMCKL_INVALID_ARG_19:
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return "Invalid argument 19";
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case QMCKL_INVALID_ARG_20:
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return "Invalid argument 20";
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case QMCKL_FAILURE:
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return "Failure";
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case QMCKL_ERRNO:
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return strerror(errno);
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case QMCKL_INVALID_CONTEXT:
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return "Invalid context";
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case QMCKL_ALLOCATION_FAILED:
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return "Allocation failed";
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case QMCKL_DEALLOCATION_FAILED:
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return "De-allocation failed";
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case QMCKL_NOT_PROVIDED:
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return "Not provided";
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case QMCKL_OUT_OF_BOUNDS:
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return "Index out of bounds";
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case QMCKL_INVALID_EXIT_CODE:
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return "Invalid exit code";
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#+end_example
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# Source
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#+begin_src c :comments org :tangle (eval c) :noweb yes :exports none
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const char* qmckl_string_of_error(const qmckl_exit_code error) {
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switch (error) {
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<<cases()>>
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}
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return "Unknown error";
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}
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void qmckl_string_of_error_f(const qmckl_exit_code error, char result[<<MAX_STRING_LENGTH()>>]) {
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strncpy(result, qmckl_string_of_error(error), <<MAX_STRING_LENGTH()>>-1);
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}
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#+end_src
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# Fortran interface
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#+begin_src f90 :tangle (eval fh_func) :exports none :noweb yes
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interface
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subroutine qmckl_string_of_error (error, string) bind(C, name='qmckl_string_of_error_f')
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use, intrinsic :: iso_c_binding
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import
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integer (qmckl_exit_code), intent(in), value :: error
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character, intent(out) :: string(<<MAX_STRING_LENGTH()>>)
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end subroutine qmckl_string_of_error
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end interface
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#+end_src
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* Data structure in context
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The strings are declared internally with a maximum fixed size to avoid
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dynamic memory allocation.
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#+begin_src c :comments org :tangle (eval h_private_type)
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#define QMCKL_MAX_FUN_LEN 256
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#define QMCKL_MAX_MSG_LEN 1024
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typedef struct qmckl_error_struct {
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qmckl_exit_code exit_code;
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char function[QMCKL_MAX_FUN_LEN];
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char message [QMCKL_MAX_MSG_LEN];
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} qmckl_error_struct;
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#+end_src
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* Updating errors in the context
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The error is updated in the context using ~qmckl_set_error~.
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When the error is set in the context, it is mandatory to specify
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from which function the error is triggered, and a message
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explaining the error. The exit code can't be ~QMCKL_SUCCESS~.
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# Header
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#+begin_src c :comments org :tangle (eval h_func)
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qmckl_exit_code
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qmckl_set_error(qmckl_context context,
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const qmckl_exit_code exit_code,
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const char* function_name,
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const char* message);
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#+end_src
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# Source
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#+begin_src c :tangle (eval c) :exports none
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qmckl_exit_code
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qmckl_set_error(qmckl_context context,
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const qmckl_exit_code exit_code,
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const char* function_name,
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const char* message)
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{
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/* Passing a function name and a message is mandatory. */
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assert (function_name != NULL);
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assert (message != NULL);
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/* Exit codes are assumed valid. */
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assert (exit_code >= 0);
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assert (exit_code != QMCKL_SUCCESS);
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assert (exit_code < QMCKL_INVALID_EXIT_CODE);
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/* The context is assumed to exist. */
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assert (qmckl_context_check(context) != QMCKL_NULL_CONTEXT);
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qmckl_lock(context);
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{
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qmckl_context_struct* const ctx = (qmckl_context_struct*) context;
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assert (ctx != NULL); /* Impossible because the context is valid. */
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ctx->error.exit_code = exit_code;
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strncpy(ctx->error.function, function_name, QMCKL_MAX_FUN_LEN-1);
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strncpy(ctx->error.message, message, QMCKL_MAX_MSG_LEN-1);
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}
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qmckl_unlock(context);
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return QMCKL_SUCCESS;
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}
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#+end_src
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* Get the error
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Upon error, the error type and message can be obtained from the
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context using ~qmckl_get_error~. The message and function name
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is returned in the variables provided. Therefore, passing a
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function name and message is mandatory.
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# Header
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#+begin_src c :comments org :tangle (eval h_func)
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qmckl_exit_code
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qmckl_get_error(qmckl_context context,
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qmckl_exit_code *exit_code,
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|
char* function_name,
|
|
char* message);
|
|
#+end_src
|
|
|
|
# Source
|
|
#+begin_src c :tangle (eval c) :exports none
|
|
qmckl_exit_code
|
|
qmckl_get_error(qmckl_context context,
|
|
qmckl_exit_code *exit_code,
|
|
char* function_name,
|
|
char* message)
|
|
{
|
|
/* Passing a function name and a message is mandatory. */
|
|
assert (function_name != NULL);
|
|
assert (message != NULL);
|
|
|
|
/* The context is assumed to exist. */
|
|
assert (qmckl_context_check(context) != QMCKL_NULL_CONTEXT);
|
|
|
|
qmckl_lock(context);
|
|
{
|
|
qmckl_context_struct* const ctx = (qmckl_context_struct*) context;
|
|
assert (ctx != NULL); /* Impossible because the context is valid. */
|
|
|
|
/* Turn off annoying GCC warning */
|
|
#ifdef __GNUC__
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wstringop-truncation"
|
|
#endif
|
|
|
|
strncpy(function_name, ctx->error.function, QMCKL_MAX_FUN_LEN-1);
|
|
strncpy(message , ctx->error.message , QMCKL_MAX_MSG_LEN-1);
|
|
|
|
#ifdef __GNUC__
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
(*exit_code) = ctx->error.exit_code;
|
|
}
|
|
qmckl_unlock(context);
|
|
|
|
return QMCKL_SUCCESS;
|
|
}
|
|
#+end_src
|
|
|
|
* Failing
|
|
|
|
To make a function fail, the ~qmckl_failwith~ function should be
|
|
called, such that information about the failure is stored in
|
|
the context. The desired exit code is given as an argument, as
|
|
well as the name of the function and an error message. If the
|
|
message is ~NULL~, then the default message obtained by
|
|
~qmckl_string_of_error~ is used. The return code of the function is
|
|
the desired return code.
|
|
Upon failure, a ~QMCKL_NULL_CONTEXT~ is returned.
|
|
|
|
#+begin_src c :comments org :tangle (eval h_func)
|
|
qmckl_exit_code
|
|
qmckl_failwith(qmckl_context context,
|
|
const qmckl_exit_code exit_code,
|
|
const char* function,
|
|
const char* message) ;
|
|
#+end_src
|
|
|
|
#+begin_src c :comments org :tangle (eval c) :exports none
|
|
qmckl_exit_code
|
|
qmckl_failwith(qmckl_context context,
|
|
const qmckl_exit_code exit_code,
|
|
const char* function,
|
|
const char* message)
|
|
{
|
|
assert (exit_code > 0);
|
|
assert (exit_code < QMCKL_INVALID_EXIT_CODE);
|
|
assert (function != NULL);
|
|
assert (strlen(function) < QMCKL_MAX_FUN_LEN);
|
|
if (message != NULL) {
|
|
assert (strlen(message) < QMCKL_MAX_MSG_LEN);
|
|
}
|
|
|
|
if (qmckl_context_check(context) == QMCKL_NULL_CONTEXT)
|
|
return QMCKL_INVALID_CONTEXT;
|
|
|
|
if (message == NULL) {
|
|
qmckl_exit_code rc =
|
|
qmckl_set_error(context, exit_code, function, qmckl_string_of_error(exit_code));
|
|
assert (rc == QMCKL_SUCCESS);
|
|
} else {
|
|
qmckl_exit_code rc =
|
|
qmckl_set_error(context, exit_code, function, message);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
}
|
|
|
|
return exit_code;
|
|
}
|
|
|
|
#+end_src
|
|
|
|
For example, this function can be used as
|
|
#+begin_src c :tangle no
|
|
if (x < 0) {
|
|
return qmckl_failwith(context,
|
|
QMCKL_INVALID_ARG_2,
|
|
"qmckl_function",
|
|
"Expected x >= 0");
|
|
}
|
|
#+end_src
|
|
|
|
|
|
* End of files :noexport:
|
|
|
|
#+begin_src c :comments link :tangle (eval h_private_type)
|
|
#endif
|
|
#+end_src
|
|
|
|
#+begin_src c :comments link :tangle (eval c_test)
|
|
/* Initialize the variables */
|
|
char function_name[QMCKL_MAX_FUN_LEN]="";
|
|
char message[QMCKL_MAX_MSG_LEN]="";
|
|
|
|
/* Set the error code to be different from Success */
|
|
qmckl_exit_code exit_code;
|
|
exit_code = 1;
|
|
|
|
assert (qmckl_set_error(context, exit_code, "qmckl_transpose", "Success") == QMCKL_SUCCESS);
|
|
|
|
assert (qmckl_get_error(context, &exit_code, function_name, message) == QMCKL_SUCCESS);
|
|
assert (exit_code == 1);
|
|
assert (strcmp(function_name,"qmckl_transpose") == 0);
|
|
assert (strcmp(message,"Success") == 0);
|
|
|
|
return 0;
|
|
}
|
|
#+end_src
|
|
|
|
# -*- mode: org -*-
|
|
# vim: syntax=c
|
|
|
|
|