let Spellings = [GNU<"shared">];
}
+def C11NoReturn : InheritableAttr {
+ let Spellings = [Keyword<"_Noreturn">];
+ let Subjects = [Function];
+ let SemaHandler = 0;
+}
+
def CXX11NoReturn : InheritableAttr {
let Spellings = [CXX11<"","noreturn">, CXX11<"std","noreturn">];
let Subjects = [Function];
bool FunctionDecl::isNoReturn() const {
return hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
+ hasAttr<C11NoReturnAttr>() ||
getType()->getAs<FunctionType>()->getNoReturnAttr();
}
FuncAttrs.addAttribute(llvm::Attribute::ReturnsTwice);
if (TargetDecl->hasAttr<NoThrowAttr>())
FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
- else if (const FunctionDecl *Fn = dyn_cast<FunctionDecl>(TargetDecl)) {
+ if (TargetDecl->hasAttr<NoReturnAttr>())
+ FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
+
+ if (const FunctionDecl *Fn = dyn_cast<FunctionDecl>(TargetDecl)) {
const FunctionProtoType *FPT = Fn->getType()->getAs<FunctionProtoType>();
if (FPT && FPT->isNothrow(getContext()))
FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
+ if (Fn->isNoReturn())
+ FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
}
- if (TargetDecl->hasAttr<NoReturnAttr>() ||
- TargetDecl->hasAttr<CXX11NoReturnAttr>())
- FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
-
- if (TargetDecl->hasAttr<ReturnsTwiceAttr>())
- FuncAttrs.addAttribute(llvm::Attribute::ReturnsTwice);
-
// 'const' and 'pure' attribute functions are also nounwind.
if (TargetDecl->hasAttr<ConstAttr>()) {
FuncAttrs.addAttribute(llvm::Attribute::ReadNone);
++I;
continue; // regular attr merging will take care of validating this.
}
+ // C's _Noreturn is allowed to be added to a function after it is defined.
+ if (isa<C11NoReturnAttr>(NewAttribute)) {
+ ++I;
+ continue;
+ }
S.Diag(NewAttribute->getLocation(),
diag::warn_attribute_precede_definition);
S.Diag(Def->getLocation(), diag::note_previous_definition);
NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope);
DeclsInPrototypeScope.clear();
+ if (D.getDeclSpec().isNoreturnSpecified())
+ NewFD->addAttr(
+ ::new(Context) C11NoReturnAttr(D.getDeclSpec().getNoreturnSpecLoc(),
+ Context));
+
// Process the non-inheritable attributes on this declaration.
ProcessDeclAttributes(S, NewFD, D,
/*NonInheritable=*/true, /*Inheritable=*/false);
// CHECK: call void @f9_t()
// CHECK: noreturn
-// CHECK: {
+// CHECK: }
void __attribute__((noreturn)) f9_t(void);
void f9(void) { f9_t(); }
+// CHECK: call void @f9a()
+// CHECK: noreturn
+// CHECK: }
+_Noreturn void f9a(void);
+void f9b(void) { f9a(); }
+
// FIXME: We should be setting nounwind on calls.
// CHECK: call i32 @f10_t()
// CHECK: readnone
test2_positive();
}
-// FIXME: do not warn here.
-_Noreturn void test5() { // expected-warning {{could be declared with attribute 'noreturn'}}
+// Do not warn here.
+_Noreturn void test5() {
test2_positive();
}