Autosar Guidelines C++14 example code compile list(20)A2-14-2String literals with different encoding prefixes

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(20)
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。

A2-14-2.cpp

算譜(source code)

A2-14-2.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg= "Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.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.

/// Comment: This rule is for last section.

///start AUTOSAR: From here to the "///end AUTOSAR" is from AUTOSAR without code having /// comment in line.
//% $Id: A2-14-2.cpp 271715 2017-03-23 10:13:51Z piotr.tanski $
#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a
#include <cstdint>

using namespace std;/// @line add using


char16_t nArray[] =
  u"Hello"
  u"World"; // Compliant, "u" stands for char16_t type

char32_t nArray2[] =
  U"Hello"
  U"World"; // Compliant, "U" stands for char32_t type

wchar_t wArray[] =
  L"Hello"
  L"World"; // Compliant, "L" stands for wchar_t type - violates A2-14-3
// rule.

wchar_t mixed1[] =
  "Hello"
  L"World"; // Compliant

char32_t mixed2[] =
  "Hello"
  U"World"; // Compliant

char16_t mixed3[] =
  "Hello"
  u"World"; // Compliant

// wchar_t mixed1[] = u"Hello" L"World"; // Non-compliant - compilation error

// char32_t mixed2[] = u"Hello" U"World"; // Non-compliant - compilation error


///end AUTOSAR
int start() { /// @{} for start
  cout << nArray <<"," << nArray2 <<"," << wArray <<","  << mixed1 <<","  << mixed2 <<","  << mixed3 <<  endl;
  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  a2-14-2
$ clang++ a2-14-2.cpp -std=c++14 -Wall
0x10d1d80f0,0x10d1d8110,0x10d1d8140,0x10d1d8170,0x10d1d81a0,0x10d1d81d0
Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.cpp
rm: a2-14-2l13: No such file or directory
$ clang++ a2-14-2.cpp -std=c++17 -Wall
0x100af50f0,0x100af5110,0x100af5140,0x100af5170,0x100af51a0,0x100af51d0
Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.cpp
$ clang++ a2-14-2.cpp -std=c++2a -Wall
0x10d8a50f0,0x10d8a5110,0x10d8a5140,0x10d8a5170,0x10d8a51a0,0x10d8a51d0
Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.cpp

$ g++-8 a2-14-2.cpp -std=c++14  -Wall
0x10c2f4070,0x10c2f40a0,0x10c2f40e0,0x10c2f4120,0x10c2f4160,0x10c2f4190
Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.cpp
$ g++-8 a2-14-2.cpp -std=c++17  -Wall
0x10a498070,0x10a4980a0,0x10a4980e0,0x10a498120,0x10a498160,0x10a498190
Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.cpp
$ g++-8 a2-14-2.cpp -std=c++2a  -Wall
0x105dd2070,0x105dd20a0,0x105dd20e0,0x105dd2120,0x105dd2160,0x105dd2190
Rule A2-14-2 (required, implementation, automated)String literals with different encoding prefixes shall not be concatenated.(20)A2-14-2.cpp

検討事項(agenda)

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 出力方法

現在先頭番地を出力。意味のある出力に変更。

参考文献(reference)

C++N4741 2018

Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4741.pdf

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

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/

文書履歴

ver 0.10 初稿 20180608
ver 0.11 見出し訂正、一覧追記 20180613