LoginSignup
1
2
AUTOSAR CountdownAdvent Calendar 2022Day 12
この記事誰得？ 私しか得しないニッチな技術で記事投稿！
@kaizen_nagoya(Dr. Kiyoshi Ogawa)

Autosar Guidelines C++14 example code compile list(14)Rule A2-11-1 An identifier declared in an inner scope

Last updated at Posted at 2018-06-07

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(14)
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、(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。

#A2-11-1.cpp
##算譜(source code)

A2-11-1.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg= "Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.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.

/// Comment: This rule is for last section.

///start AUTOSAR: From here to the "///end AUTOSAR" is from AUTOSAR without code having /// comment in line.
//% $Id: A2-11-1.cpp 271715 2017-03-23 10:13:51Z piotr.tanski $
#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a
#include <cstdint>

using namespace std;/// @line add using

std::int32_t sum = 0;
namespace
{
  std::int32_t sum; // Non-compliant, hides sum in outer scope
}
class C1
{
  std::int32_t sum; // Compliant, does not hide sum in outer scope
public:
  C1() {
    cout << "C1:sum="<<sum <<endl; /// @line for output
  }
};
namespace n1
{
  std::int32_t sum; // Compliant, does not hide sum in outer scope
  void f0() { /// @{} add for aotput
    cout << "f2:{sum}="<< sum<<endl;
  }
}
std::int32_t idx;
void f1(std::int32_t) { /// @{} add output
  cout << "f1"<<endl;
}
void f2()
{
  std::int32_t max = 5;
  for (std::int32_t idx = 0; idx < max;
       ++idx) // Non-compliant, hides idx in outer scope
  {
    for (std::int32_t idx = 0; idx < max; ++idx) // Non-compliant, hides idx in outer scope
    {
    }
    cout << "f2(){idx="<<idx<<"}" <<endl; /// @line for output
  }
}
void f3()
{
  std::int32_t i = 0;
  std::int32_t j = 0;
  auto lambda = [i]() {
    std::int32_t j =
      10; // Compliant - j was not captured, so it does not hide
// j in outer scope
    cout << "f3(){j="<<j<<"}" <<endl; /// @line for output
    return i + j;
  };
  cout << "j="<<j<< endl; /// @line for output
}
///end AUTOSAR
int start() { /// @{} for start
  int32_t i=1024;
  n1::f0();
  f1(i);
  f2();
  f3();
  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 a2-11-1
$ clang++ a2-11-1.cpp -std=c++14 -Wall
a2-11-1.cpp:55:6: warning: unused variable 'lambda' [-Wunused-variable]
auto lambda = [i]() {
     ^
a2-11-1.cpp:20:14: warning: unused variable 'sum' [-Wunused-variable]
std::int32_t sum; // Non-compliant, hides sum in outer scope
             ^
2 warnings generated.
f2:{sum}=0
f1
f2(){idx=0}
f2(){idx=1}
f2(){idx=2}
f2(){idx=3}
f2(){idx=4}
j=0
Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.cpp
rm: a2-11-1l13: No such file or directory
$ clang++ a2-11-1.cpp -std=c++17 -Wall
a2-11-1.cpp:55:6: warning: unused variable 'lambda' [-Wunused-variable]
auto lambda = [i]() {
     ^
a2-11-1.cpp:20:14: warning: unused variable 'sum' [-Wunused-variable]
std::int32_t sum; // Non-compliant, hides sum in outer scope
             ^
2 warnings generated.
f2:{sum}=0
f1
f2(){idx=0}
f2(){idx=1}
f2(){idx=2}
f2(){idx=3}
f2(){idx=4}
j=0
Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.cpp
$ clang++ a2-11-1.cpp -std=c++2a -Wall
a2-11-1.cpp:55:6: warning: unused variable 'lambda' [-Wunused-variable]
auto lambda = [i]() {
     ^
a2-11-1.cpp:20:14: warning: unused variable 'sum' [-Wunused-variable]
std::int32_t sum; // Non-compliant, hides sum in outer scope
             ^
2 warnings generated.
f2:{sum}=0
f1
f2(){idx=0}
f2(){idx=1}
f2(){idx=2}
f2(){idx=3}
f2(){idx=4}
j=0
Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.cpp

$ g++-8 a2-11-1.cpp -std=c++14  -Wall
a2-11-1.cpp: In function 'void f3()':
a2-11-1.cpp:55:6: warning: variable 'lambda' set but not used [-Wunused-but-set-variable]
 auto lambda = [i]() {
      ^~~~~~
a2-11-1.cpp: At global scope:
a2-11-1.cpp:20:14: warning: '{anonymous}::sum' defined but not used [-Wunused-variable]
 std::int32_t sum; // Non-compliant, hides sum in outer scope
              ^~~
f2:{sum}=0
f1
f2(){idx=0}
f2(){idx=1}
f2(){idx=2}
f2(){idx=3}
f2(){idx=4}
j=0
Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.cpp
$ g++-8 a2-11-1.cpp -std=c++17  -Wall
a2-11-1.cpp: In function 'void f3()':
a2-11-1.cpp:55:6: warning: variable 'lambda' set but not used [-Wunused-but-set-variable]
 auto lambda = [i]() {
      ^~~~~~
a2-11-1.cpp: At global scope:
a2-11-1.cpp:20:14: warning: '{anonymous}::sum' defined but not used [-Wunused-variable]
 std::int32_t sum; // Non-compliant, hides sum in outer scope
              ^~~
f2:{sum}=0
f1
f2(){idx=0}
f2(){idx=1}
f2(){idx=2}
f2(){idx=3}
f2(){idx=4}
j=0
Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.cpp
$ g++-8 a2-11-1.cpp -std=c++2a  -Wall
a2-11-1.cpp: In function 'void f3()':
a2-11-1.cpp:55:6: warning: variable 'lambda' set but not used [-Wunused-but-set-variable]
 auto lambda = [i]() {
      ^~~~~~
a2-11-1.cpp: At global scope:
a2-11-1.cpp:20:14: warning: '{anonymous}::sum' defined but not used [-Wunused-variable]
 std::int32_t sum; // Non-compliant, hides sum in outer scope
              ^~~
f2:{sum}=0
f1
f2(){idx=0}
f2(){idx=1}
f2(){idx=2}
f2(){idx=3}
f2(){idx=4}
j=0
Rule A2-11-1 (required, implementation, automated)An identifier declared in an inner scope shall not hide an identifier declared in an outer scope.(14)A2-11-1.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

#参考文献(reference)
#参考文献(reference)

###プログラミング言語教育のXYZ
https://qiita.com/kaizen_nagoya/items/1950c5810fb5c0b07be4
プログラミング言語教育のXYZ(youtube)
https://www.youtube.com/watch?v=He1_tg4px-w&t=486s

###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/

###　CEDD(Compile Error Driven Design)
初めての　CEDD(Compile Error Driven Design) ８回直してコンパイル。
https://qiita.com/kaizen_nagoya/items/9494236aa1753f3fd1e1

コンパイルエラーを記録するとよい理由7つ
https://qiita.com/kaizen_nagoya/items/85c0e92b206883140e89

C Puzzle Bookの有り難み5つ、C言語規格及びCコンパイラの特性を認識
https://qiita.com/kaizen_nagoya/items/d89a48c1536a02ecdec9

C言語（C++)に対する誤解、曲解、無理解、爽快。
https://qiita.com/kaizen_nagoya/items/3f3992c9722c1cee2e3a

Qiitaに投稿するCのStyle例(暫定)
https://qiita.com/kaizen_nagoya/items/946df1528a6a1ef2bc0d

C++N4606 Working Draft 2016, ISO/IEC 14882, C++ standardのコード断片をコンパイルするためにしていること
https://qiita.com/kaizen_nagoya/items/a8d7ee2f2e29e76c19c1

コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)
https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da

[C][C++]の国際規格案の例題をコンパイルするときの課題７つ。
https://qiita.com/kaizen_nagoya/items/5f4b155030259497c4de

docker gnu(gcc/g++) and llvm(clang/clang++)
https://qiita.com/drafts/059874ea39c4de64c0f7
#文書履歴(document history)
ver 0.10 初稿 20180607
ver 0.11 一覧追記 20180613
ver 0.12 参考文献欄追記 20180616

最後までおよみいただきありがとうございました。

いいね　💚、フォローをお願いします。

Thank you very much for reading to the last sentence.

Please press the like icon 💚　and follow me for your happy life.

1
2
0

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
Sign upLogin
1
2