`A2-10-1`: False positive around null identifiers on tuple-like types in structural binding (relevant C++17 only)
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评估
调研方向
从 openpilot's dmonitoring.cc:82:10 中的发现开始,检查 IdentifierHiding.ql,以了解如何识别未命名的类 tuple 绑定。然后检查 tuple.h 存根,并编译提供的结构化绑定示例。当该示例能够使用 tuple 元素编译,且连续绑定不再触发误报时,即表示完成。
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描述
Affected rules
- A2-10-1
- RULE-5-3
- M0-1-3
Description
the extractor creates local variables for each identifier, and one for the entire binding. The later is of type tuple without a name, so it gets (null) .
This means if you have another structured binding later on, the rule is falsely triggered because the name is the same.
Example
#include <tuple>
void f9(int x, int y){
auto tup = std::make_tuple(1, 2);
const auto & [ a, b ] = tup;
const auto & [ c, d ] = tup;
}
this example will require additional stubbing to be added to the tuple.h stub, as it currently will not compile due to tuples in that stub not currently having elements. Compilation error message: error: type 'const std::tuple<int, int>' decomposes into 0 elements, but 2 names were provided (ie needs to have mechanism to have elements and get those elements)
another example is the current finding in openpilot- dmonitoring.cc:82:10 from query IdentifierHiding.ql
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