Fix issues around dynamic generic function and autodiff. (#2528)

* Fix issues around dynamic generic function and autodiff.

* Fix return type issue.

* Fix type unification for generic `inout` parameter.

* Fix.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/source/slang/slang-ast-decl.cpp b/source/slang/slang-ast-decl.cpp
index b2802e304..9931bbcaf 100644
--- a/source/slang/slang-ast-decl.cpp
+++ b/source/slang/slang-ast-decl.cpp
@@ -18,6 +18,19 @@ const TypeExp& TypeConstraintDecl::_getSupOverride() const
     //return TypeExp::empty;
 }
 
+InterfaceDecl* findParentInterfaceDecl(Decl* decl)
+{
+    auto ancestor = decl->parentDecl;
+    for (; ancestor; ancestor = ancestor->parentDecl)
+    {
+        if (auto interfaceDecl = as<InterfaceDecl>(ancestor))
+            return interfaceDecl;
+
+        if (as<ExtensionDecl>(ancestor))
+            return nullptr;
+    }
+    return nullptr;
+}
 
 bool isInterfaceRequirement(Decl* decl)
 {