LANG.STRUCT.SE.STMT : Too Many Side Effects in Statement

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C and C++

LANG.STRUCT.SE.STMT : Too Many Side Effects in Statement

要旨

An expression statement contains two or more side effects.

There are two kinds of expression statement that will not trigger warnings of this class.

An expression statement that consists only of a single function call (see Too Many Side Effects in Function Call).
An expression statement that contains one or more comma operators.

プロパティ

クラス名

Too Many Side Effects in Statement

日本語クラス名

Too Many Side Effects in Statement

クラス分類

スタイル (style)

ニーモニック

LANG.STRUCT.SE.STMT

カテゴリー

JSF++	JSF++:204	A single operation with side-effects shall only be used in certain contexts.
JPL	JPL:19	Do not use expressions with side effects.

対応言語

C および C++ で利用可能です。

有効/無効設定

このワーニングクラスのチェックはデフォルトで無効になっており、プロジェクトには非正規の C向けAST が必要になります。有効にするにはプロジェクト設定ファイル（configuration file）に以下の WARNING_FILTER ルールと RETAIN_UNNORMALIZED_C_AST 設定を追加してください。

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Too Many Side Effects in Statement"

注：非正規化された AST を継続して使用した場合、使用ディスク容量が増加し解析時間が長くなる可能性があります。

例

extern int x, y;
extern int f(int);                             /* Functions are assumed to have side effects unless
                                                * SIDE_EFFECT_FREE_FUNCTIONS specifies otherwise */
extern int g(int, int);
void too_many_side_effects_statement(void){
    x++;                                                    /* only one side effect */
    x--, y--;                                               /* contains comma operator */
    x++ + y++;         /* 'Too Many Side Effects in Statement' warning issued here */
    f(x) + f(y);       /* 'Too Many Side Effects in Statement' warning issued here */
    g(x+=2, y+=4) + 2; /* 'Too Many Side Effects in Statement' warning issued here
                        * ('Too Many Side Effects in Function Call' warning also issued if enabled) */
    g(x+=3, y+=5);                                         /* consists only of a single function call
                                                            * ('Too Many Side Effects in Function Call'
                                                            *  warning issued if enabled) */
}

LANG.STRUCT.SE.STMT : Too Many Side Effects in Statement

要旨

プロパティ

例

関連のある設定ファイルパラメータ