================
@@ -503,6 +503,41 @@ static bool HasNoThrowOperator(CXXRecordDecl *RD,
OverloadedOperatorKind Op,
return false;
}
+static bool equalityComparisonIsDefaulted(Sema &S, const TagDecl *Decl,
+ SourceLocation KeyLoc) {
+ CanQualType T = S.Context.getCanonicalTagType(Decl);
+
+ EnterExpressionEvaluationContext UnevaluatedContext(
+ S, Sema::ExpressionEvaluationContext::Unevaluated);
+ Sema::SFINAETrap SFINAE(S, /*WithAccessChecking=*/true);
+ Sema::ContextRAII TUContext(S, S.Context.getTranslationUnitDecl());
+
+ // const ClassT& obj;
+ OpaqueValueExpr Operand(KeyLoc, T.withConst(), ExprValueKind::VK_LValue);
+ UnresolvedSet<16> Functions;
+ // obj == obj;
+ S.LookupBinOp(S.TUScope, {}, BinaryOperatorKind::BO_EQ, Functions);
+
+ auto Result = S.CreateOverloadedBinOp(KeyLoc, BinaryOperatorKind::BO_EQ,
+ Functions, &Operand, &Operand);
+ if (Result.isInvalid() || SFINAE.hasErrorOccurred())
+ return false;
+
+ const auto *CallExpr = dyn_cast<CXXOperatorCallExpr>(Result.get());
+ if (!CallExpr)
+ return isa<EnumDecl>(Decl);
+ const auto *Callee = CallExpr->getDirectCallee();
+ auto ParamT = Callee->getParamDecl(0)->getType();
+ if (!Callee->isDefaulted())
+ return false;
+ if (!ParamT->isReferenceType()) {
+ const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Decl);
+ if (!RD->isTriviallyCopyable())
----------------
Fznamznon wrote:
That probably should use `cast` instead of `dyn_cast` or check that RD is not
null before dereferencing it.
https://github.com/llvm/llvm-project/pull/169079
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