Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(132)
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、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。
A15-3-4.cpp
算譜(source code)
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-3-4 (required, implementation, non-automated) Catch-all (ellipsis and std::exception) handlers shall be used only in (a) main, (b) task main functions, (c) in functions that are supposed to isolate independent components and (d) when calling third-party code that uses exceptions not according to AUTOSAR C++14 guidelines.(132)A15-3-4.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: A15-3-4.cpp 271752 2017-03-23 12:07:07Z piotr.tanski $
#include <stdexcept>
#include <thread>
extern std::int32_t fn(); // Prototype of external third-party library function
void f1() noexcept(false)
{
try
{
std::int32_t ret = fn();
cout <<"ret="<<ret<<endl;/// @ line for output
// ...
}
// ...
catch (...) // Compliant
{
// Handle all unexpected exceptions from fn() function
}
}
void f2() noexcept(false)
{
std::int32_t ret =
fn(); // Non-compliant - can not be sure whether fn() throws or not
if (ret < 10)
{
throw std::underflow_error("Error");
}
else if (ret < 20)
{
// ...
}
else if (ret < 30)
{
throw std::overflow_error("Error");
}
else
{
throw std::range_error("Error");
}
}
void f3() noexcept(false)
{
try
{
f2();
}
catch (std::exception& e) // Non-compliant - caught exception is too
// general, no information which error occured
{
// Nothing to do
throw;
}
}
void f4() noexcept(false)
{
try
{
f3();
}
catch (...) // Non-compliant - no information about the exception
{
// Nothing to do
throw;
}
}
class ExecutionManager
{
public:
ExecutionManager() = default;
void execute() noexcept(false)
{
try
{
f3();
}
// ...
catch (std::exception& e) // Compliant
{
// Handle all expected exceptions
}
catch (...) // Compliant
{
// Handle all unexpected exceptions
}
}
};
void threadMain() noexcept
{
try
{
f3();
}
// ...
catch (std::exception& e) // Compliant
{
// Handle all expected exceptions
}
catch (...) // Compliant
{
// Handle all unexpected exceptions
}
}
int main(int, char**)
{
try
{
ExecutionManager execManager;
execManager.execute();
// ...
std::thread t(&threadMain);
// ...
f4();
}
// ...
catch (std::exception& e) // Compliant
{
// Handle all expected exceptions
}
catch (...) // Compliant
{
// Handle all unexpected exceptions
}
///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.
}
#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a
using namespace std;/// @line add using
int32_t fn() { /// add {} for link error
cout << "fn()"<<endl; // Prototype of external third-party library function
return (int32_t)true;
}
編纂・実行結果(compile and go)
$ ../cpa2.sh a15-3-4 a15-3-4a
$ clang++ a15-3-4.cpp a15-3-4a.cpp -std=c++14 -Wall
fn()
fn()
fn()
libc++abi.dylib: terminating
../cpa2.sh: line 7: 67170 Abort trap: 6 ./$1l14 $2
$ clang++ a15-3-4.cpp a15-3-4a.cpp -std=c++17 -Wall
fn()
fn()
fn()
libc++abi.dylib: terminating
../cpa2.sh: line 13: 67176 Abort trap: 6 ./$1l17 $2
$ clang++ a15-3-4.cpp a15-3-4a.cpp -std=c++2a -Wall
fn()
fn()
fn()
libc++abi.dylib: terminating
../cpa2.sh: line 19: 67183 Abort trap: 6 ./$1l2a $2
$ g++-8 a15-3-4.cpp a15-3-4a.cpp -std=c++14 -Wall
fn()
fn()
fn()
terminate called without an active exception
../cpa2.sh: line 26: 67198 Abort trap: 6 ./$1g14 $2
$ g++-8 a15-3-4.cpp a15-3-4a.cppp -std=c++17 -Wall
fn()
fn()
fn()
terminate called without an active exception
../cpa2.sh: line 32: 67213 Abort trap: 6 ./$1g17 $2
$ g++-8 a15-3-4.cpp a15-3-4a.cppp -std=c++2a -Wall
fn()
fn()
fn()
terminate called without an active exception
../cpa2.sh: line 38: 67228 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.役に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/2018/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(document history)
ver 0.10 初稿 20180612
ver 0.11 一覧追記 20180613