Avoid adding types to default namespace (microsoft#6700)

Some of the types that have been added to the vk namespace were being
added to the default namespace when compiling for DXIL. The if
conditions were such that they would fall through to a default case.

The solution is to explicitly add code that we should skip adding those
builtin types when the vk namespace is not defined.

Fixes microsoft#6646.

Author: s-perron

tools/clang/lib/Sema/SemaHLSL.cpp

@@ -3817,29 +3817,41 @@ class HLSLExternalSource : public ExternalSemaSource {
         recordDecl = m_ThreadNodeOutputRecordsTemplateDecl->getTemplatedDecl();
       }
 #ifdef ENABLE_SPIRV_CODEGEN
-      else if (kind == AR_OBJECT_VK_SPIRV_TYPE && m_vkNSDecl) {
+      else if (kind == AR_OBJECT_VK_SPIRV_TYPE) {
+        if (!m_vkNSDecl)
+          continue;
         recordDecl =
             DeclareInlineSpirvType(*m_context, m_vkNSDecl, typeName, false);
         recordDecl->setImplicit(true);
-      } else if (kind == AR_OBJECT_VK_SPIRV_OPAQUE_TYPE && m_vkNSDecl) {
+      } else if (kind == AR_OBJECT_VK_SPIRV_OPAQUE_TYPE) {
+        if (!m_vkNSDecl)
+          continue;
         recordDecl =
             DeclareInlineSpirvType(*m_context, m_vkNSDecl, typeName, true);
         recordDecl->setImplicit(true);
-      } else if (kind == AR_OBJECT_VK_INTEGRAL_CONSTANT && m_vkNSDecl) {
+      } else if (kind == AR_OBJECT_VK_INTEGRAL_CONSTANT) {
+        if (!m_vkNSDecl)
+          continue;
         recordDecl =
             DeclareVkIntegralConstant(*m_context, m_vkNSDecl, typeName,
                                       &m_vkIntegralConstantTemplateDecl);
         recordDecl->setImplicit(true);
-      } else if (kind == AR_OBJECT_VK_LITERAL && m_vkNSDecl) {
+      } else if (kind == AR_OBJECT_VK_LITERAL) {
+        if (!m_vkNSDecl)
+          continue;
         recordDecl = DeclareTemplateTypeWithHandleInDeclContext(
             *m_context, m_vkNSDecl, typeName, 1, nullptr);
         recordDecl->setImplicit(true);
         m_vkLiteralTemplateDecl = recordDecl->getDescribedClassTemplate();
-      } else if (kind == AR_OBJECT_VK_SPV_INTRINSIC_TYPE && m_vkNSDecl) {
+      } else if (kind == AR_OBJECT_VK_SPV_INTRINSIC_TYPE) {
+        if (!m_vkNSDecl)
+          continue;
         recordDecl = DeclareUIntTemplatedTypeWithHandleInDeclContext(
             *m_context, m_vkNSDecl, typeName, "id");
         recordDecl->setImplicit(true);
-      } else if (kind == AR_OBJECT_VK_SPV_INTRINSIC_RESULT_ID && m_vkNSDecl) {
+      } else if (kind == AR_OBJECT_VK_SPV_INTRINSIC_RESULT_ID) {
+        if (!m_vkNSDecl)
+          continue;
         recordDecl = DeclareTemplateTypeWithHandleInDeclContext(
             *m_context, m_vkNSDecl, typeName, 1, nullptr);
         recordDecl->setImplicit(true);
@@ -4505,8 +4517,6 @@ class HLSLExternalSource : public ExternalSemaSource {
       int startDepth = (templateArgCount == 0) ? 0 : 1;
       CXXRecordDecl *recordDecl = m_objectTypeDecls[i];
       if (recordDecl == nullptr) {
-        DXASSERT(kind == AR_OBJECT_WAVE,
-                 "else objects other than reserved not initialized");
         continue;
       }
 

tools/clang/test/SemaHLSL/vk.types.in.dxil.hlsl

@@ -0,0 +1,12 @@
+// RUN: %dxc -T ps_6_0 -E PSMain -fcgl  %s -verify
+
+static const integral_constant MyVar; // expected-error{{unknown type name 'integral_constant'}}
+static const SpirvType MyVar; // expected-error{{unknown type name 'SpirvType'}}
+static const SpirvOpaqueType MyVar; // expected-error{{unknown type name 'SpirvOpaqueType'}}
+static const Literal MyVar; // expected-error{{unknown type name 'Literal'}}
+
+float4 PSMain() : SV_TARGET
+{
+    return float4(1.0, 1.0, 1.0, 1.0);
+}
+