Implement DR1330 in C++11 mode, to support libstdc++4.7 which uses it.
We have a new flavor of exception specification, EST_Uninstantiated. A function
type with this exception specification carries a pointer to a FunctionDecl, and
the exception specification for that FunctionDecl is instantiated (if needed)
and used in the place of the function type's exception specification.
When a function template declaration with a non-trivial exception specification
is instantiated, the specialization's exception specification is set to this
new 'uninstantiated' kind rather than being instantiated immediately.
Expr::CanThrow has migrated onto Sema, so it can instantiate exception specs
on-demand. Also, any odr-use of a function triggers the instantiation of its
exception specification (the exception specification could be needed by IRGen).
In passing, fix two places where a DeclRefExpr was created but the corresponding
function was not actually marked odr-used. We used to get away with this, but
don't any more.
Also fix a bug where instantiating an exception specification which refers to
function parameters resulted in a crash. We still have the same bug in default
arguments, which I'll be looking into next.
This, plus a tiny patch to fix libstdc++'s common_type, is enough for clang to
parse (and, in very limited testing, support) all of libstdc++4.7's standard
headers.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154886 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 5511fc0..a66378e 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -4181,10 +4181,7 @@
unsigned ThisTypeQuals) {
// Transform the parameters and return type.
//
- // We instantiate in source order, with the return type first followed by
- // the parameters, because users tend to expect this (even if they shouldn't
- // rely on it!).
- //
+ // We are required to instantiate the params and return type in source order.
// When the function has a trailing return type, we instantiate the
// parameters before the return type, since the return type can then refer
// to the parameters themselves (via decltype, sizeof, etc.).
@@ -4230,6 +4227,8 @@
return QualType();
}
+ // FIXME: Need to transform the exception-specification too.
+
QualType Result = TL.getType();
if (getDerived().AlwaysRebuild() ||
ResultType != T->getResultType() ||