Attach resource attributes to handle within record, instead of record…

… (#101433)

This PR attaches the resource attributes, `HLSLResourceAttr` and
`HLSLResourceClassAttr`, to the handle contained within such resource
classes like `RWBuffer`. CodeGen will now search for fields within HLSL
resource decls, and emit previous data based on attributes on the handle
member. An AST-dump test was added to verify that the resource attribute
is attached to the handle within the resource record decl.
Fixes #98556

---------

Co-authored-by: Justin Bogner <mail@justinbogner.com>

clang/lib/CodeGen/CGHLSLRuntime.cpp

@@ -280,18 +280,22 @@ void CGHLSLRuntime::annotateHLSLResource(const VarDecl *D, GlobalVariable *GV) {
   const auto *RD = Ty->getAsCXXRecordDecl();
   if (!RD)
     return;
-  const auto *HLSLResAttr = RD->getAttr<HLSLResourceAttr>();
-  const auto *HLSLResClassAttr = RD->getAttr<HLSLResourceClassAttr>();
-  if (!HLSLResAttr || !HLSLResClassAttr)
-    return;
+  // the resource related attributes are on the handle member
+  // inside the record decl
+  for (auto *FD : RD->fields()) {
+    const auto *HLSLResAttr = FD->getAttr<HLSLResourceAttr>();
+    const auto *HLSLResClassAttr = FD->getAttr<HLSLResourceClassAttr>();
+    if (!HLSLResAttr || !HLSLResClassAttr)
+      continue;
 
-  llvm::hlsl::ResourceClass RC = HLSLResClassAttr->getResourceClass();
-  llvm::hlsl::ResourceKind RK = HLSLResAttr->getResourceKind();
-  bool IsROV = HLSLResAttr->getIsROV();
-  llvm::hlsl::ElementType ET = calculateElementType(CGM.getContext(), Ty);
+    llvm::hlsl::ResourceClass RC = HLSLResClassAttr->getResourceClass();
+    llvm::hlsl::ResourceKind RK = HLSLResAttr->getResourceKind();
+    bool IsROV = HLSLResAttr->getIsROV();
+    llvm::hlsl::ElementType ET = calculateElementType(CGM.getContext(), Ty);
 
-  BufferResBinding Binding(D->getAttr<HLSLResourceBindingAttr>());
-  addBufferResourceAnnotation(GV, RC, RK, IsROV, ET, Binding);
+    BufferResBinding Binding(D->getAttr<HLSLResourceBindingAttr>());
+    addBufferResourceAnnotation(GV, RC, RK, IsROV, ET, Binding);
+  }
 }
 
 CGHLSLRuntime::BufferResBinding::BufferResBinding(

clang/lib/Sema/HLSLExternalSemaSource.cpp

@@ -80,7 +80,7 @@ struct BuiltinTypeDeclBuilder {
   }
 
   BuiltinTypeDeclBuilder &
-  addMemberVariable(StringRef Name, QualType Type,
+  addMemberVariable(StringRef Name, QualType Type, llvm::ArrayRef<Attr *> Attrs,
                     AccessSpecifier Access = AccessSpecifier::AS_private) {
     if (Record->isCompleteDefinition())
       return *this;
@@ -96,13 +96,16 @@ struct BuiltinTypeDeclBuilder {
         nullptr, false, InClassInitStyle::ICIS_NoInit);
     Field->setAccess(Access);
     Field->setImplicit(true);
+    for (Attr *A : Attrs)
+      Field->addAttr(A);
     Record->addDecl(Field);
     Fields[Name] = Field;
     return *this;
   }
 
   BuiltinTypeDeclBuilder &
-  addHandleMember(AccessSpecifier Access = AccessSpecifier::AS_private) {
+  addHandleMember(ResourceClass RC, ResourceKind RK, bool IsROV,
+                  AccessSpecifier Access = AccessSpecifier::AS_private) {
     if (Record->isCompleteDefinition())
       return *this;
     QualType Ty = Record->getASTContext().VoidPtrTy;
@@ -112,17 +115,13 @@ struct BuiltinTypeDeclBuilder {
         Ty = Record->getASTContext().getPointerType(
             QualType(TTD->getTypeForDecl(), 0));
     }
-    return addMemberVariable("h", Ty, Access);
-  }
-
-  BuiltinTypeDeclBuilder &annotateHLSLResource(ResourceClass RC,
-                                               ResourceKind RK, bool IsROV) {
-    if (Record->isCompleteDefinition())
-      return *this;
-    Record->addAttr(
-        HLSLResourceClassAttr::CreateImplicit(Record->getASTContext(), RC));
-    Record->addAttr(
-        HLSLResourceAttr::CreateImplicit(Record->getASTContext(), RK, IsROV));
+    // add handle member
+    llvm::SmallVector<Attr *, 2> Attrs;
+    Attr *ResourceClassAttr =
+        HLSLResourceClassAttr::CreateImplicit(Record->getASTContext(), RC);
+    Attr *ResourceAttr =
+        HLSLResourceAttr::CreateImplicit(Record->getASTContext(), RK, IsROV);
+    addMemberVariable("h", Ty, {ResourceClassAttr, ResourceAttr}, Access);
     return *this;
   }
 
@@ -489,9 +488,8 @@ static BuiltinTypeDeclBuilder setupBufferType(CXXRecordDecl *Decl, Sema &S,
                                               ResourceClass RC, ResourceKind RK,
                                               bool IsROV) {
   return BuiltinTypeDeclBuilder(Decl)
-      .addHandleMember()
-      .addDefaultHandleConstructor(S, RC)
-      .annotateHLSLResource(RC, RK, IsROV);
+      .addHandleMember(RC, RK, IsROV)
+      .addDefaultHandleConstructor(S, RC);
 }
 
 void HLSLExternalSemaSource::defineHLSLTypesWithForwardDeclarations() {

clang/test/AST/HLSL/RWBuffer-AST.hlsl

@@ -30,9 +30,9 @@ RWBuffer<float> Buffer;
 // CHECK-NEXT: CXXRecordDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc> implicit class RWBuffer definition
 
 // CHECK: FinalAttr 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> Implicit final
+// CHECK-NEXT: FieldDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc> implicit h 'element_type *'
 // CHECK-NEXT: HLSLResourceClassAttr 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> Implicit UAV
 // CHECK-NEXT: HLSLResourceAttr 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> Implicit TypedBuffer
-// CHECK-NEXT: FieldDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc> implicit h 'element_type *'
 
 // CHECK: CXXMethodDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc> operator[] 'element_type &const (unsigned int) const'
 // CHECK-NEXT: ParmVarDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc> Idx 'unsigned int'
@@ -59,6 +59,6 @@ RWBuffer<float> Buffer;
 // CHECK: TemplateArgument type 'float'
 // CHECK-NEXT: BuiltinType 0x{{[0-9A-Fa-f]+}} 'float'
 // CHECK-NEXT: FinalAttr 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> Implicit final
+// CHECK-NEXT: FieldDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc> implicit referenced h 'float *'
 // CHECK-NEXT: HLSLResourceClassAttr 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> Implicit UAV
 // CHECK-NEXT: HLSLResourceAttr 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> Implicit TypedBuffer
-// CHECK-NEXT: FieldDecl 0x{{[0-9A-Fa-f]+}} <<invalid sloc>> <invalid sloc>  implicit referenced h 'float *'

clang/test/ParserHLSL/hlsl_resource_handle_attrs.hlsl

@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -ast-dump -o - %s | FileCheck %s
+
+// CHECK: -ClassTemplateDecl 0x{{[0-9a-f]+}} <<invalid sloc>> <invalid sloc> implicit RWBuffer
+// CHECK: -CXXRecordDecl 0x{{[0-9a-f]+}} <<invalid sloc>> <invalid sloc> implicit class RWBuffer definition
+// CHECK: -FieldDecl 0x{{[0-9a-f]+}} <<invalid sloc>> <invalid sloc> implicit h 'element_type *'
+// CHECK: -HLSLResourceClassAttr 0x{{[0-9a-f]+}} <<invalid sloc>> Implicit UAV
+// CHECK: -HLSLResourceAttr 0x{{[0-9a-f]+}} <<invalid sloc>> Implicit TypedBuffer
+RasterizerOrderedBuffer<vector<float, 4> > BufferArray3[4] : register(u4, space1);
+
+// CHECK: -ClassTemplateSpecializationDecl 0x{{[0-9a-f]+}} <<invalid sloc>> <invalid sloc> class RWBuffer definition implicit_instantiation
+// CHECK: -FieldDecl 0x{{[0-9a-f]+}} <<invalid sloc>> <invalid sloc> implicit referenced h 'float *'
+// CHECK: -HLSLResourceClassAttr 0x{{[0-9a-f]+}} <<invalid sloc>> Implicit UAV
+// CHECK: -HLSLResourceAttr 0x{{[0-9a-f]+}} <<invalid sloc>> Implicit TypedBuffer
+RWBuffer<float> Buffer1;