def warn_unused_expr : Warning<"expression result unused">,
InGroup<UnusedValue>;
+def err_incomplete_type_used_in_type_trait_expr : Error<
+ "incomplete type %0 used in type trait expression">;
+
// inline asm.
def err_asm_wide_character : Error<"wide string is invalid in 'asm'">;
def err_asm_invalid_lvalue_in_output : Error<"invalid lvalue in asm output">;
SourceLocation LParen,
TypeTy *Ty,
SourceLocation RParen) {
- // FIXME: Some of the type traits have requirements. Interestingly, only the
- // __is_base_of requirement is explicitly stated to be diagnosed. Indeed, G++
- // accepts __is_pod(Incomplete) without complaints, and claims that the type
- // is indeed a POD.
+ QualType T = QualType::getFromOpaquePtr(Ty);
+
+ // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
+ // all traits except __is_class, __is_enum and __is_union require a the type
+ // to be complete.
+ if (OTT != UTT_IsClass && OTT != UTT_IsEnum && OTT != UTT_IsUnion) {
+ if (RequireCompleteType(KWLoc, T,
+ diag::err_incomplete_type_used_in_type_trait_expr,
+ SourceRange(), SourceRange(), T))
+ return ExprError();
+ }
// There is no point in eagerly computing the value. The traits are designed
// to be used from type trait templates, so Ty will be a template parameter
// 99% of the time.
- return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT,
- QualType::getFromOpaquePtr(Ty),
- RParen, Context.BoolTy));
+ return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT, T,
+ RParen, Context.BoolTy));
}
QualType Sema::CheckPointerToMemberOperands(