[HLSL] Fix debug info generation for RWBuffer types (#119041)

This PR fix the debug infor generation for RWBuffer types.
- This implements the [same fix as
DXC](microsoft/DirectXShaderCompiler#6296).
- Adds the HLSLAttributedResource debug info generation

Closes #118523

---------

Co-authored-by: Joao Saffran <[email protected]>
Co-authored-by: joaosaffran <[email protected]>

Author: 3 people

clang/lib/CodeGen/CGDebugInfo.cpp

@@ -3492,6 +3492,11 @@ llvm::DIType *CGDebugInfo::CreateType(const PipeType *Ty, llvm::DIFile *U) {
   return getOrCreateType(Ty->getElementType(), U);
 }
 
+llvm::DIType *CGDebugInfo::CreateType(const HLSLAttributedResourceType *Ty,
+                                      llvm::DIFile *U) {
+  return getOrCreateType(Ty->getWrappedType(), U);
+}
+
 llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
   const EnumDecl *ED = Ty->getDecl();
 
@@ -3834,12 +3839,13 @@ llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
 
   case Type::TemplateSpecialization:
     return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
+  case Type::HLSLAttributedResource:
+    return CreateType(cast<HLSLAttributedResourceType>(Ty), Unit);
 
   case Type::CountAttributed:
   case Type::Auto:
   case Type::Attributed:
   case Type::BTFTagAttributed:
-  case Type::HLSLAttributedResource:
   case Type::Adjusted:
   case Type::Decayed:
   case Type::DeducedTemplateSpecialization:

clang/lib/CodeGen/CGDebugInfo.h

@@ -196,6 +196,8 @@ class CGDebugInfo {
   llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
   llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
   llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
+  llvm::DIType *CreateType(const HLSLAttributedResourceType *Ty,
+                           llvm::DIFile *F);
   /// Get structure or union type.
   llvm::DIType *CreateType(const RecordType *Tyg);
 

clang/test/CodeGenHLSL/debug/rwbuffer_debug_info.hlsl

@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.6-compute -x hlsl -emit-llvm -disable-llvm-passes -o - -hlsl-entry main %s -debug-info-kind=standalone -dwarf-version=4  | FileCheck %s
+
+
+// CHECK: [[DWTag:![0-9]+]] = distinct !DICompositeType(tag: DW_TAG_class_type, name: "RWBuffer<float>", 
+// CHECK: [[RWBuffer:![0-9]+]] = distinct !DISubprogram(name: "RWBuffer",
+// CHECK-SAME: scope: [[DWTag]]
+// CHECK: [[FirstThis:![0-9]+]] = !DILocalVariable(name: "this", arg: 1, scope: [[RWBuffer]], type: [[thisType:![0-9]+]]
+// CHECK: [[thisType]] = !DIDerivedType(tag: DW_TAG_reference_type, baseType: [[DWTag]], size: 32)
+RWBuffer<float> Out : register(u7, space4);
+
+[numthreads(8,1,1)]
+void main(int GI : SV_GroupIndex) {
+  Out[GI] = 0;
+}