blocks|key|3012220|text|索引将解决这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3012221|for+i+:=+range+versions+{
++++res+:=+createWorkerFor(&versions[i])
++++...

}|code-block|syntax|javascript|3012222|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Indexing will solve the problem:
<pre><code>for i := range versions {
 res := createWorkerFor(&amp;versions[i])
 ...

}
</code></pre>

blocks|key|1911899|text|简而言之，这个警告意味着您正在接受一个循环变量的地址。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1911900|这是因为在for+statements中迭代变量被重用。在每次迭代时，范围表达式中的下一个元素的值被分配给迭代变量；v不会改变，只会改变它的值。因此，表达式&v指的是内存中相同的位置。|offset|length|style|CODE|1911901|以下代码四次打印相同的内存地址：|1911902|for+_,+n+:=+range+[]int{1,+2,+3,+4}+{
++++fmt.Printf("%25p\n",+&n)
}|code-block|syntax|javascript|1911903|当您存储迭代变量的地址，或者在循环内部的闭包中使用它时，当您取消引用指针时，它的值可能已经发生了变化。静态分析工具将检测到这一点，并发出您看到的警告。|1911904|防止这一问题的共同办法是：|1911905|1911906|索引远程切片/数组/地图。这将在第一位置获取实际元素的地址，而不是迭代变量|unordered-list-item|1911907|。|1911908|for+i+:=+range+versions+{
++++res+:=+createWorkerFor(&versions[i])
}|1911909|1911910|重新分配循环|1911911|中的迭代变量|1911912|for+_,+v+:=+range+versions+{
++++v+:=+v
++++res+:=+createWorkerFor(&v)+//+this+is+now+the+address+of+the+inner+v
}|1911913|使用闭包的|1911914|，将迭代变量作为参数传递给闭包|1911915|1911916|for+_,+v+:=+range+versions+{+
++++go+func(arg+ObjectDescription)+{
++++++++x+:=+&arg+//+safe
++++}(v)
}|1911917|1911918|如果您在循环中按顺序取消引用，并且确信没有泄漏指针，您可能会忽略此检查。然而，linter的工作恰恰是报告可能导致问题的代码模式，所以无论如何修复它是个好主意。|1911919|entityMap|0|LINK|mutability|MUTABLE|url|https://golang.org/ref/spec#For_statements^0|0|5|3|1M|1|26|2|5|E|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1Q|8|@$D|1R|E|1S|F|G]|$D|1T|E|1U|F|G]|$D|1V|E|1W|F|G]]|9|@$D|1X|E|1Y|1|1Z]]|A|$]]|$1|H|3|I|5|6|7|20|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|21|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|22|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|23|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|24|8|@]|9|@]|A|$]]|$1|T|3|U|5|V|7|25|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|26|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|L|7|27|8|@]|9|@]|A|$M|N]]|$1|10|3|-4|5|6|7|28|8|@]|9|@]|A|$]]|$1|11|3|12|5|V|7|29|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|2A|8|@]|9|@]|A|$]]|$1|15|3|16|5|L|7|2B|8|@]|9|@]|A|$M|N]]|$1|17|3|18|5|6|7|2C|8|@]|9|@]|A|$]]|$1|19|3|1A|5|V|7|2D|8|@]|9|@]|A|$]]|$1|1B|3|-4|5|6|7|2E|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|L|7|2F|8|@]|9|@]|A|$M|N]]|$1|1E|3|-4|5|6|7|2G|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|6|7|2H|8|@]|9|@]|A|$]]|$1|1H|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]]|1I|$1J|$5|1K|1L|1M|A|$1N|1O]]]]

The warning means, in short, that you are taking the address of a loop variable.
This happens because in <a href="https://golang.org/ref/spec#For_statements" rel="noreferrer"><code>for</code> statements</a> the iteration variable(s) is reused. At each iteration, the value of the next element in the range expression is assigned to the iteration variable; <code>v</code> doesn't change, only its value changes. Hence, the expression <code>&amp;v</code> is referring to the same location in memory.
The following code prints the same memory address four times:
<pre><code>for _, n := range []int{1, 2, 3, 4} {
 fmt.Printf(&quot;%p\n&quot;, &amp;n)
}
</code></pre>
When you store the address of the iteration variable, or when you use it in a closure inside the loop, by the time you dereference the pointer, its value might have changed. Static analysis tools will detect this and emit the warning you see.
Common ways to prevent the issue are:
<ul>
<li>index the ranged slice/array/map. This takes the address of the actual element at i-th position, instead of the iteration variable</li>
</ul>
<pre><code>for i := range versions {
 res := createWorkerFor(&amp;versions[i])
}
</code></pre>
<ul>
<li>reassign the iteration variable inside the loop</li>
</ul>
<pre><code>for _, v := range versions {
 v := v
 res := createWorkerFor(&amp;v) // this is now the address of the inner v
}
</code></pre>
<ul>
<li>with closures, pass the iteration variable as argument to the closure</li>
</ul>
<pre><code>for _, v := range versions { 
 go func(arg ObjectDescription) {
 x := &amp;arg // safe
 }(v)
}
</code></pre>
<hr>
In case you dereference sequentially within the loop and you know for sure that nothing is leaking the pointer, you might get away with ignoring this check. However the job of the linter is precisely to report code patterns that could cause issues, so it's a good idea to fix it anyway.

I'm using golangci-lint and I'm getting an error on the following code:

<pre><code>versions []ObjectDescription
... (populate versions) ...

for i, v := range versions {
 res := createWorkerFor(&amp;v)
 ...

}
</code></pre>

the error is:

<pre><code>G601: Implicit memory aliasing in for loop. (gosec)
 res := createWorkerFor(&amp;v)
 ^
</code></pre>

What does "implicit memory aliasing in for loop" mean, exactly? I could not find any error description in the golangci-lint documentation. I don't understand this error.

Implicit memory aliasing in for loop

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用的是golangci-lint，下面的代码出错了：versions []ObjectDescription... (populate versions) ...for i, v := range versions {    res := createWorkerFor(&v)    ...}错误是：G601: I...

问隐式内存混叠for循环
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