From 939be44ca23476e622dfb24a592383fe2a1da61f Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 26 Oct 2022 08:32:24 -0700
Subject: Auto synthesis of Differential type (#2466)

---
 source/slang/slang-ast-decl.cpp | 57 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

(limited to 'source/slang/slang-ast-decl.cpp')

diff --git a/source/slang/slang-ast-decl.cpp b/source/slang/slang-ast-decl.cpp
index 2df9164fb..b2802e304 100644
--- a/source/slang/slang-ast-decl.cpp
+++ b/source/slang/slang-ast-decl.cpp
@@ -1,5 +1,6 @@
 // slang-ast-decl.cpp
 #include "slang-ast-builder.h"
+#include "slang-syntax.h"
 #include <assert.h>
 
 #include "slang-generated-ast-macro.h"
@@ -32,4 +33,60 @@ bool isInterfaceRequirement(Decl* decl)
     return false;
 }
 
+void ContainerDecl::buildMemberDictionary()
+{
+    // Don't rebuild if already built
+    if (isMemberDictionaryValid())
+        return;
+
+    // If it's < 0 it means that the dictionaries are entirely invalid
+    if (dictionaryLastCount < 0)
+    {
+        dictionaryLastCount = 0;
+        memberDictionary.Clear();
+        transparentMembers.clear();
+    }
+
+    // are we a generic?
+    GenericDecl* genericDecl = as<GenericDecl>(this);
+
+    const Index membersCount = members.getCount();
+
+    SLANG_ASSERT(dictionaryLastCount >= 0 && dictionaryLastCount <= membersCount);
+
+    for (Index i = dictionaryLastCount; i < membersCount; ++i)
+    {
+        Decl* m = members[i];
+
+        auto name = m->getName();
+
+        // Add any transparent members to a separate list for lookup
+        if (m->hasModifier<TransparentModifier>())
+        {
+            TransparentMemberInfo info;
+            info.decl = m;
+            transparentMembers.add(info);
+        }
+
+        // Ignore members with no name
+        if (!name)
+            continue;
+
+        // Ignore the "inner" member of a generic declaration
+        if (genericDecl && m == genericDecl->inner)
+            continue;
+
+        m->nextInContainerWithSameName = nullptr;
+
+        Decl* next = nullptr;
+        if (memberDictionary.TryGetValue(name, next))
+            m->nextInContainerWithSameName = next;
+
+        memberDictionary[name] = m;
+    }
+
+    dictionaryLastCount = membersCount;
+    SLANG_ASSERT(isMemberDictionaryValid());
+}
+
 } // namespace Slang
-- 
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