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@kaizen_nagoya(Dr. Kiyoshi Ogawa)

Autosar Guidelines C++14, example code compile list(52)Rule A6-4-1 A switch statement shall have at least two case-clauses,

Last updated at Posted at 2018-06-10

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(52)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf

Autosar Guidelines C++14 example code compile list
https://qiita.com/kaizen_nagoya/items/8ccbf6675c3494d57a76
#目的(purpose)
AutosarのC++ GuidelineをOS, 制御のプログラムで利用するにあたって、(1)hosted, freestandingのどちらを基本にすべきか。(2)C++2014,C++2017, C++202aのどれを用いると良いか, (3)どの処理系を併用すると良いかを検討するため、-std=c++14, -std=c++17, -std=c++2aの3種類で、複数のコンパイラでコンパイルすることにより、誤(error)、警告(warning)、関数・変数連携(link)、出力(output)、にどのような影響があるかを確認する。
#成果(outcome)
複数の処理系の特徴が明確になるとともに、各標準段階, hosted, freestandingの特徴と課題を明確にする。

#A6-4-1.cpp
##算譜(source code)

A6-4-1.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp";
//https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
// There is no description about Autosar declear hosted or freestanding.
// If the Autosar intended both depending on the cases, autosar.h can choose one.
// Compile with -DHOSTED work as  hosted environment, -DFREESTANDING work as freestanding.

#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a

using namespace std;/// @line add using

///start AUTOSAR: From here to the "///end AUTOSAR" is from AUTOSAR without code having /// comment in line.
// $Id: A6-4-1.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
#include <cstdint>
void f1(std::uint8_t choice) noexcept
{
  switch (choice)
  {
  default:
    break;
  } // Non-compliant, the switch statement is redundant
  cout << "choice="<<(int)choice<<endl;/// @ line for output
}
void f2(std::uint8_t choice) noexcept
{

  switch (choice)
  {
  case 0:
// ...
    break;

  default:
// ...
    break;
  } // Non-compliant, only 1 case-clause

  if (choice == 0) // Compliant, an equivalent if statement
  {
// ...
  }
  else
  {
// ...
  }

// ...
  switch (choice)
  {
  case 0:
// ...
    break;

  case 1:
// ...
    break;

  default:
// ...
    break;
  } // Compliant
  cout << "choice="<<(int)choice<<endl;/// @ line for output

}
///end AUTOSAR
int start() { /// @{} for start
  uint8_t ui=127;
  cout << "ui="<<(int)ui<<endl;/// @ line for output
  f1(ui);
  f2(ui);
  cout<< msg << endl;
  ShutdownOS()  EXIT_SUCCESS;
/// Autosar OS 3.1.1, 2009: 7.1.2.2 Undefined Behaviour in OSEK OS
/// OS425 If ShutdownOS is called and ShutdownHook() returns then the operating system shall disable all interrupts and enter an endless loop.
}

##編纂・実行結果(compile and go)

cpa.sh
$ ../cpa.sh a6-4-1
$ clang++ a6-4-1.cpp -I./ -std=c++14 -Wall
ui=127
choice=127
choice=127
Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp
$ clang++ a6-4-1.cpp  -I./ -std=c++17 -Wall
ui=127
choice=127
choice=127
Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp
$ clang++ a6-4-1.cpp  -I./ -std=c++2a -Wall
ui=127
choice=127
choice=127
Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp

$ g++-8 a6-4-1.cpp  -I./ -std=c++14  -Wall
ui=127
choice=127
choice=127
Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp
$ g++-8 a6-4-1.cpp  -I./ -std=c++17  -Wall
ui=127
choice=127
choice=127
Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp
$ g++-8 a6-4-1.cpp  -I./ -std=c++2a  -Wall
ui=127
choice=127
choice=127
Rule A6-4-1 (required, implementation, automated)A switch statement shall have at least two case-clauses, distinct from the default label.(52)A6-4-1.cpp

#検討事項(agenda)
###0 運用方法
A6-4-1は、複数のswitch選択肢があった処理が、結果として２つだけになった場合に違反になる。この場合は、if文に変更するのではなく、逸脱の手続きを取るのが良い。

###1. 自律(freestanding)環境. 接待(hosted)環境

C++N4606 1.4 Implementation compliance p.4

###2. 対応OSの水準、対応通信規約、応用機能による分類
freestanding用の関数、ライブラリ等
###3. C++2014, C++2017, C++202aの比較項目
本件なし
###4. clang++, g++の比較検討項目
本件なし

###5 役立つまたは意味のある出力
uint8_tの値がcoutで出力できず(int)でキャストした。
Ctype cast。他の規則に抵触。

#参考文献(reference)

###プログラミング言語教育のXYZ
https://qiita.com/kaizen_nagoya/items/1950c5810fb5c0b07be4
プログラミング言語教育のXYZ(youtube)
https://www.youtube.com/watch?v=He1_tg4px-w&t=486s

###C++N4741 2018
Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/n4741.pdf

C++N4741, 2018 Standard Working Draft on ISO/IEC 14882 sample code compile list
https://qiita.com/kaizen_nagoya/items/3294c014044550896010

###C++N4606 2016
Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/n4606.pdf

C++N4606, 2016符号断片編纂一覧(example code compile list)
Working Draft 2016, ISO/IEC 14882(1)
https://qiita.com/kaizen_nagoya/items/df5d62c35bd6ed1c3d43/

###　CEDD(Compile Error Driven Design)
初めての　CEDD(Compile Error Driven Design) ８回直してコンパイル。
https://qiita.com/kaizen_nagoya/items/9494236aa1753f3fd1e1

コンパイルエラーを記録するとよい理由7つ
https://qiita.com/kaizen_nagoya/items/85c0e92b206883140e89

C Puzzle Bookの有り難み5つ、C言語規格及びCコンパイラの特性を認識
https://qiita.com/kaizen_nagoya/items/d89a48c1536a02ecdec9

C言語（C++)に対する誤解、曲解、無理解、爽快。
https://qiita.com/kaizen_nagoya/items/3f3992c9722c1cee2e3a

Qiitaに投稿するCのStyle例(暫定)
https://qiita.com/kaizen_nagoya/items/946df1528a6a1ef2bc0d

C++N4606 Working Draft 2016, ISO/IEC 14882, C++ standardのコード断片をコンパイルするためにしていること
https://qiita.com/kaizen_nagoya/items/a8d7ee2f2e29e76c19c1

コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)
https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da

[C][C++]の国際規格案の例題をコンパイルするときの課題７つ。
https://qiita.com/kaizen_nagoya/items/5f4b155030259497c4de

docker gnu(gcc/g++) and llvm(clang/clang++)
https://qiita.com/drafts/059874ea39c4de64c0f7

#文書履歴(document history)
ver 0.10 初稿 20180610
ver 0.12 一覧追記 参考文献欄追記 20180616
ver 0.11 一覧追記 20180613

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