================
@@ -620,6 +620,21 @@ void ExprEngine::VisitDeclStmt(const DeclStmt *DS,
ExplodedNode *Pred,
return;
}
+ // Self-assignment initialization in variable declaration,
+ // i.e., `int x = x;`,
+ // is a C idiom to suppress warnings of unused variables.
+ // This filter will not match variables of C++ record types, but will match
+ // C++ references. Allow references continuing here to make the undefined
+ // value checker report self-assignments of C++ references.
+ if (const Expr *EI = VD->getInit()) {
+ if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(EI->IgnoreImpCasts()))
----------------
AaronBallman wrote:
The kind of situation where this comes up is macro expansions because it's
idiomatic to wrap macro arguments in parens. Consider:
```
#define INIT(x) (x)
int v = INIT(v);
```
That ends up expanding to the parenthesized form. I don't think it's the most
critical thing to support, but given that it should be low effort, it seems
like a nice-to-have.
https://github.com/llvm/llvm-project/pull/187530
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