From b7d318f48db2cb83a41d665f1727ae93fc555124 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 28 Sep 2023 18:07:40 -0700
Subject: Support `constref` parameters passing. (#3249)

* Support `constref` parameters passing.

* Fix.

* Fix.

* Add test and diagnostic on mix use of __constref and no_diff.

* check for [constref] on differentiable member method.

---------

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-syntax.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'source/slang/slang-syntax.cpp')

diff --git a/source/slang/slang-syntax.cpp b/source/slang/slang-syntax.cpp
index 1f96df2f0..8ed50510f 100644
--- a/source/slang/slang-syntax.cpp
+++ b/source/slang/slang-syntax.cpp
@@ -603,6 +603,10 @@ Index getFilterCountImpl(const ReflectClassInfo& clsInfo, MemberFilterStyle filt
             {
                 paramType = astBuilder->getRefType(paramType);
             }
+            else if (paramDecl->findModifier<ConstRefModifier>())
+            {
+                paramType = astBuilder->getConstRefType(paramType);
+            }
             else if( paramDecl->findModifier<OutModifier>() )
             {
                 if(paramDecl->findModifier<InOutModifier>() || paramDecl->findModifier<InModifier>())
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