Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(119)
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。
A15-0-3.cpp
算譜(source code)
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(119)A15-0-3.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: A15-0-3.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
#include <cstdint>
#include <stdexcept>
#include <vector>
class A
{
public:
explicit A(std::int32_t value) noexcept(false) : x(value)
{
if (x == 0)
{
throw std::invalid_argument("Constructor: Invalid Argument");
}
}
private:
std::int32_t x;
};
int main(int, char**)
{
constexpr std::int32_t limit = 10;
std::vector<A> vec1; // Constructor and assignment operator of A class
// throw exceptions
try
{
for (std::int32_t i = 1; i < limit; ++i)
{
vec1.push_back(A(i)); // Constructor of A class will not throw for
// value from 1 to 10
}
vec1.emplace(vec1.begin(),
0); // Non-compliant - constructor A(0) throws in an
// emplace() method of std::vector. This leads to
// unexpected result of emplace() method. Throwing an
// exception inside an object constructor in emplace()
// leads to duplication of one of vector’s elements.
// Vector invariants are valid and the object is destructible.
cout <<"try:vec1"<<endl;/// @ line for output
}
catch (std::invalid_argument& e)
{
cout <<"catch:vec1"<<endl;/// @ line for output
// Handle an exception
}
std::vector<A> vec2;
vec2.reserve(limit);
try
{
for (std::int32_t i = limit - 1; i >= 0; --i)
{
vec2.push_back(A(i)); // Compliant - constructor of A(0) throws for
// i = 0, but in this case strong exception
// safety is guaranteed. While push_back()
// offers strong exception safety guarantee,
// push_back can only succeed to add a new
// element or fails and does not change the
// container
}
cout <<"try:vec2"<<endl;/// @ line for output
}
catch (std::invalid_argument& e)
{
cout <<"catch:vec2"<<endl;/// @ line for output
// Handle an exception
}
///return 0;/// @ comment for output
///}/// @ comment for output
/// @ end AUTOSAR
///int start() { /// @{} for start
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 a15-0-3
$ clang++ a15-0-3.cpp -I./ -std=c++14 -Wall
catch:vec1
catch:vec2
Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(117)A15-0-3.cpp
$ clang++ a15-0-3.cpp -I./ -std=c++17 -Wall
catch:vec1
catch:vec2
Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(117)A15-0-3.cpp
$ clang++ a15-0-3.cpp -I./ -std=c++2a -Wall
catch:vec1
catch:vec2
Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(117)A15-0-3.cpp
$ g++-8 a15-0-3.cpp -I./ -std=c++14 -Wall
catch:vec1
catch:vec2
Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(117)A15-0-3.cpp
$ g++-8 a15-0-3.cpp -I./ -std=c++17 -Wall
catch:vec1
catch:vec2
Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(117)A15-0-3.cpp
$ g++-8 a15-0-3.cpp -I./ -std=c++2a -Wall
catch:vec1
catch:vec2
Rule A15-0-3 (required, implementation, non-automated)Exception safety guarantee of a called function shall be considered.the nothrow guarantee.(117)A15-0-3.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
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