Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(155)
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。
A18-1-4.cpp
算譜(source code)
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A18-1-4 (required, implementation, automated)The std::shared_ptr shall not refer to an array type.(155)A18-1-4.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: A18-1-4.cpp 271752 2017-03-23 12:07:07Z piotr.tanski $
#include <array>
#include <memory>
#include <vector>
class A
{
};
void f1() noexcept(false)
{
A cArray[10]; // Compliant
std::shared_ptr<A> ptr1(
cArray); // Non-compliant - ptr1 will not delete all of its elements
std::shared_ptr<A> ptr2(
new A[10]); // Non-compliant - ptr2 will not delete all of its elements
// std::shared_ptr<A[]> ptr3(new A[10]); // Non-compliant - compilation
// error
std::shared_ptr<std::array<A, 10>> ptr4 =
std::make_shared<std::array<A, 10>>(); // Compliant
std::shared_ptr<std::vector<A>> ptr5 =
std::make_shared<std::vector<A>>(10, A()); // Compliant
}
void f2() noexcept(false)
{
// std::unique_ptr<A> ptr1 = std::make_unique<A>(10); // Non-compliant - no
// such constructor in class A
std::unique_ptr<A> ptr2{
new A[10]}; // Non-compliant - ptr2 will not delete all of its elements
std::unique_ptr<A[]> ptr3 =
std::make_unique<A[]>(10); // Compliant - std::unique_ptr provides a
// specialization for T[] types
}
/// @ end AUTOSAR
int start() { /// @{} for start
f1();
f2();
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 a18-1-4
$ clang++ a18-1-4.cpp -I./ -std=c++14 -Wall
a18-1-4l14(71681,0x7fff896c5380) malloc: *** error for object 0x7ffee0474708: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
../cpa.sh: line 7: 71681 Abort trap: 6 ./$1l14 $2
$ clang++ a18-1-4.cpp -I./ -std=c++17 -Wall
a18-1-4l17(71686,0x7fff896c5380) malloc: *** error for object 0x7ffee780c708: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
../cpa.sh: line 13: 71686 Abort trap: 6 ./$1l17 $2
$ clang++ a18-1-4.cpp -I./ -std=c++2a -Wall
a18-1-4l2a(71691,0x7fff896c5380) malloc: *** error for object 0x7ffee28c5708: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
../cpa.sh: line 19: 71691 Abort trap: 6 ./$1l2a $2
$ g++-8 a18-1-4.cpp -I./ -std=c++14 -Wall
a18-1-4g14(71701,0x7fff896c5380) malloc: *** error for object 0x7ffedfcfc721: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
../cpa.sh: line 26: 71701 Abort trap: 6 ./$1g14 $2
$ g++-8 a18-1-4.cpp -I./ -std=c++17 -Wall
a18-1-4g17(71711,0x7fff896c5380) malloc: *** error for object 0x7ffee62e7721: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
../cpa.sh: line 32: 71711 Abort trap: 6 ./$1g17 $2
$ g++-8 a18-1-4.cpp -I./ -std=c++2a -Wall
a18-1-4g2a(71721,0x7fff896c5380) malloc: *** error for object 0x7ffee1062721: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
../cpa.sh: line 38: 71721 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
本件なし
5. 役立つまたは意味のある実行時エラーを取る方法
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