Non virtual accept implementation on AST types (#1351)

* First pass impl of making accept on AST node types non virtual.

* A single switch for ITypeVistor on Val type.

* Use ORIGIN to choose ITypeVisitor dispatch.

* Don't use ORIGIN - we don't need special handling for ITypeVisitor on Val derived types.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/slang/slang-ast-support-types.h b/source/slang/slang-ast-support-types.h
index c1072c923..9b8cfbea2 100644
--- a/source/slang/slang-ast-support-types.h
+++ b/source/slang/slang-ast-support-types.h
@@ -491,6 +491,12 @@ namespace Slang
             // We include super.m_classId, because it's a subclass of itself.
             return m_classId >= super.m_classId && m_classId <= super.m_lastClassId;
         }
+        // True if typeId derives from this type
+        SLANG_FORCE_INLINE bool isDerivedFrom(uint32_t typeId) const
+        {
+            return typeId >= m_classId && typeId <= m_lastClassId;
+        }
+
         /// Will produce the same result as isSubClassOf, but more slowly by traversing the m_superClass
         /// Works without initRange being called. 
         bool isSubClassOfSlow(const ThisType& super) const;