Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(28)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
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。
A4-5-1.cpp
算譜(source code)
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.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
#include <cstdint>
using namespace std;/// @line add using
///start AUTOSAR: From here to the "///end AUTOSAR" is from AUTOSAR without code having /// comment in line.
// $Id: A4-5-1.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
#include <cstdint>
enum Colour : std::uint8_t
{
Red,
Green,
Blue,
ColoursCount
};
void f1() noexcept(false)
{
Colour colour = Red;
if (colour == Green) // Compliant
{
}
if (colour == (Red + Blue)) // Non-compliant
{
}
if (colour < ColoursCount) // Compliant
{
}
cout << "colour="<<colour<<endl;
}
enum class Car : std::uint8_t
{
Model1,
Model2,
Model3,
ModelsCount
};
void f2() noexcept(false)
{
Car car = Car::Model1;
if (car != Car::Model2) // Compliant
{
}
if (car == Car::Model3) // Compliant
{
}
// if (car == (Car::Model1 + Car::Model2)) // Non-compliant -
// operator+ not provided for Car enum class, compilation error
//{
//}
if (car < Car::ModelsCount) // Compliant
{
}
}
Car operator+(Car lhs, Car rhs)
{
return Car::Model3;
}
void f3() noexcept(false)
{
Car car = Car::Model3;
if (car == (Car::Model1 + Car::Model2)) // Non-compliant - overloaded
// operator+ provided, no
// compilation error
{
}
}
enum Team : std::uint8_t
{
TeamMember1 = 0,
TeamMember2 = 1,
TeamMember3 = 2,
TeamMember4 = 3,
TeamMembersStart = TeamMember1,
TeamMembersEnd = TeamMember2,
TeamMembersCount = 4
};
void f4(const char* teamMember)
{
// Implementation
cout << "teamMember="<<teamMember << endl;/// @ line for output
}
void f5()
{
const char* team[TeamMembersCount]= {"TeamMember1","TeamMember2","TeamMembersCount","TeammMember"}; // Compliant/// @ add string
// ...
f4(team[TeamMember2]); // Compliant
}
///end AUTOSAR
int start() { /// @{} for start
f1();
f2();
f3();
f5();
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 a4-5-1
$ clang++ a4-5-1.cpp -I./ -std=c++14 -Wall
colour=0
teamMember=TeamMember2
Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.cpp
$ clang++ a4-5-1.cpp -I./ -std=c++17 -Wall
colour=0
teamMember=TeamMember2
Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.cpp
$ clang++ a4-5-1.cpp -I./ -std=c++2a -Wall
colour=0
teamMember=TeamMember2
Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.cpp
$ g++-8 a4-5-1.cpp -I./ -std=c++14 -Wall
colour=0
teamMember=TeamMember2
Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.cpp
$ g++-8 a4-5-1.cpp -I./ -std=c++17 -Wall
colour=0
teamMember=TeamMember2
Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.cpp
$ g++-8 a4-5-1.cpp -I./ -std=c++2a -Wall
colour=0
teamMember=TeamMember2
Rule A4-5-1 (required, implementation, automated)Expressions with type enum or enum class shall not be used as operands to built-in and overloaded operators other than the subscript operator [ ], the assignment operator =, the equality operators == and ! =, the unary & operator, and the relational operators <, <=, >, >=.(28)A4-5-1.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 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
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 20180609