Autosar Guidelines C++14, example code compile list(133)Rule A15-3-5 A class type exception shall be caught by reference or const reference.

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(133)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
Autosar Guidelines C++14, example code compile list will be listed.

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、以下を検討する。
(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。
-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。
各標準段階の違いを明確にする。
hostedまたはfreestandingの特徴と課題を明確にする。

A15-3-5.cpp

算譜(source code)

A15-3-5.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-3-5 (required, implementation, automated)A class type exception shall be caught by reference or const reference.(133)A15-3-5.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" are from the AUTOSAR code without some code having /// comment in line.
//% $Id: A15-3-5.cpp 271715 2017-03-23 10:13:51Z piotr.tanski $
#include <iostream>
#include <stdexcept>
class Exception : public std::runtime_error
{
public:
  using std::runtime_error::runtime_error;
  const char* what() const noexcept(true) override
  {
    return "Exception error message";
  }
};
void fn()
{
  try
  {
// ...
    throw std::runtime_error("Error");
// ...
    throw Exception("Error");
  }

  catch (const std::logic_error& e) // Compliant - caught by const reference
  {
// Handle exception
  }
  catch (std::runtime_error& e) // Compliant - caught by reference
  {
    std::cout << e.what() << "\n"; // "Error" or "Exception error message"
// will be printed, depending upon the
// actual type of thrown object
    throw e; // The exception re-thrown is of its original type
  }

  catch (
      std::runtime_error
      e) // Non-compliant - derived types will be caught as the base type
  {
    std::cout
        << e.what()
        << "\n"; // Will always call what() method from std::runtime_error
    throw e; // The exception re-thrown is of the std::runtime_error type,
// not the original exception type
  }
}
/// @ end AUTOSAR
int start() { /// @{} for start
  fn();
  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 a15-3-5
$ clang++ a15-3-5.cpp -I./ -std=c++14 -Wall
a15-3-5.cpp:48:2: warning: exception of type 'std::runtime_error' will be caught by earlier handler [-Wexceptions]
 std::runtime_error
 ^
a15-3-5.cpp:39:9: note: for type 'std::runtime_error &'
 catch (std::runtime_error& e) // Compliant - caught by reference
        ^
1 warning generated.
Error
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: Error
../cpa.sh: line 7: 67285 Abort trap: 6           ./$1l14 $2
$ clang++ a15-3-5.cpp  -I./ -std=c++17 -Wall
a15-3-5.cpp:48:2: warning: exception of type 'std::runtime_error' will be caught by earlier handler [-Wexceptions]
 std::runtime_error
 ^
a15-3-5.cpp:39:9: note: for type 'std::runtime_error &'
 catch (std::runtime_error& e) // Compliant - caught by reference
        ^
1 warning generated.
Error
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: Error
../cpa.sh: line 13: 67290 Abort trap: 6           ./$1l17 $2
$ clang++ a15-3-5.cpp  -I./ -std=c++2a -Wall
a15-3-5.cpp:48:2: warning: exception of type 'std::runtime_error' will be caught by earlier handler [-Wexceptions]
 std::runtime_error
 ^
a15-3-5.cpp:39:9: note: for type 'std::runtime_error &'
 catch (std::runtime_error& e) // Compliant - caught by reference
        ^
1 warning generated.
Error
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: Error
../cpa.sh: line 19: 67295 Abort trap: 6           ./$1l2a $2

$ g++-8 a15-3-5.cpp  -I./ -std=c++14  -Wall
a15-3-5.cpp: In function 'void fn()':
a15-3-5.cpp:49:2: warning: catching polymorphic type 'class std::runtime_error' by value [-Wcatch-value=]
  e) // Non-compliant - derived types will be caught as the base type
  ^
a15-3-5.cpp:47:2: warning: exception of type 'std::runtime_error' will be caught
  catch (
  ^~~~~
a15-3-5.cpp:39:2: warning:    by earlier handler for 'std::runtime_error'
  catch (std::runtime_error& e) // Compliant - caught by reference
  ^~~~~
Error
terminate called after throwing an instance of 'std::runtime_error'
  what():  Error
../cpa.sh: line 26: 67305 Abort trap: 6           ./$1g14 $2
$ g++-8 a15-3-5.cpp  -I./ -std=c++17  -Wall
a15-3-5.cpp: In function 'void fn()':
a15-3-5.cpp:49:2: warning: catching polymorphic type 'class std::runtime_error' by value [-Wcatch-value=]
  e) // Non-compliant - derived types will be caught as the base type
  ^
a15-3-5.cpp:47:2: warning: exception of type 'std::runtime_error' will be caught
  catch (
  ^~~~~
a15-3-5.cpp:39:2: warning:    by earlier handler for 'std::runtime_error'
  catch (std::runtime_error& e) // Compliant - caught by reference
  ^~~~~
Error
terminate called after throwing an instance of 'std::runtime_error'
  what():  Error
../cpa.sh: line 32: 67315 Abort trap: 6           ./$1g17 $2
$ g++-8 a15-3-5.cpp  -I./ -std=c++2a  -Wall
a15-3-5.cpp: In function 'void fn()':
a15-3-5.cpp:49:2: warning: catching polymorphic type 'class std::runtime_error' by value [-Wcatch-value=]
  e) // Non-compliant - derived types will be caught as the base type
  ^
a15-3-5.cpp:47:2: warning: exception of type 'std::runtime_error' will be caught
  catch (
  ^~~~~
a15-3-5.cpp:39:2: warning:    by earlier handler for 'std::runtime_error'
  catch (std::runtime_error& e) // Compliant - caught by reference
  ^~~~~
Error
terminate called after throwing an instance of 'std::runtime_error'
  what():  Error
../cpa.sh: line 38: 67325 Abort trap: 6           ./$1g2a $2

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

clang++とg++で警告、実行時エラーの詳細が異なる。

5. 役立つまたは意味のある実行時エラーの取り方

6. 役立つまたは意味のある出力

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

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/

文書履歴

ver 0.10 初稿 20180612