[SPIRV] Implements vk::BufferPointer proposal (microsoft#7163)

Implements [vk::BufferPointer
proposal](https://github.com/microsoft/hlsl-specs/blob/main/proposals/0010-vk-buffer-ref.md).
Closes microsoft#6489.

Author: danbrown-amd

include/dxc/HlslIntrinsicOp.h

@@ -231,6 +231,9 @@ enum class IntrinsicOp {
   IOP_VkReadClock = 223,
   IOP_Vkext_execution_mode = 224,
   IOP_Vkext_execution_mode_id = 225,
+  IOP_Vkreinterpret_pointer_cast = 360,
+  IOP_Vkstatic_pointer_cast = 361,
+  MOP_GetBufferContents = 362,
   MOP_Append = 226,
   MOP_RestartStrip = 227,
   MOP_CalculateLevelOfDetail = 228,
@@ -366,7 +369,7 @@ enum class IntrinsicOp {
   IOP_usign = 355,
   MOP_InterlockedUMax = 356,
   MOP_InterlockedUMin = 357,
-  Num_Intrinsics = 360,
+  Num_Intrinsics = 363,
 };
 inline bool HasUnsignedIntrinsicOpcode(IntrinsicOp opcode) {
   switch (opcode) {

include/dxc/dxcapi.internal.h

@@ -7,6 +7,9 @@
 //                                                                           //
 // Provides non-public declarations for the DirectX Compiler component.      //
 //                                                                           //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.              //
+// All rights reserved.                                                      //
+//                                                                           //
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef __DXC_API_INTERNAL__
@@ -35,6 +38,7 @@ typedef struct ID3D10Blob ID3D10Blob;
 static const BYTE INTRIN_TEMPLATE_FROM_TYPE = 0xff;
 static const BYTE INTRIN_TEMPLATE_VARARGS = 0xfe;
 static const BYTE INTRIN_TEMPLATE_FROM_FUNCTION = 0xfd;
+static const BYTE INTRIN_TEMPLATE_FROM_FUNCTION_2 = 0xfc;
 
 // Use this enumeration to describe allowed templates (layouts) in intrinsics.
 enum LEGAL_INTRINSIC_TEMPLATES {
@@ -128,7 +132,9 @@ enum LEGAL_INTRINSIC_COMPTYPES {
 
   LICOMPTYPE_HIT_OBJECT = 51,
 
-  LICOMPTYPE_COUNT = 52
+  LICOMPTYPE_VK_BUFFER_POINTER = 52,
+
+  LICOMPTYPE_COUNT = 53
 };
 
 static const BYTE IA_SPECIAL_BASE = 0xf0;

lib/HLSL/HLOperationLower.cpp

@@ -7,6 +7,9 @@
 //                                                                           //
 // Lower functions to lower HL operations to DXIL operations.                //
 //                                                                           //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.              //
+// All rights reserved.                                                      //
+//                                                                           //
 ///////////////////////////////////////////////////////////////////////////////
 
 #define _USE_MATH_DEFINES
@@ -6818,6 +6821,12 @@ IntrinsicLower gLowerTable[] = {
     {IntrinsicOp::IOP_DxMaybeReorderThread, TranslateMaybeReorderThread,
      DXIL::OpCode::NumOpCodes_Dxil_1_8}, // FIXME: Just a placeholder Dxil
                                          // opcode
+    {IntrinsicOp::IOP_Vkstatic_pointer_cast, UnsupportedVulkanIntrinsic,
+     DXIL::OpCode::NumOpCodes},
+    {IntrinsicOp::IOP_Vkreinterpret_pointer_cast, UnsupportedVulkanIntrinsic,
+     DXIL::OpCode::NumOpCodes},
+    {IntrinsicOp::MOP_GetBufferContents, UnsupportedVulkanIntrinsic,
+     DXIL::OpCode::NumOpCodes},
 };
 } // namespace
 static_assert(

tools/clang/include/clang/AST/HlslTypes.h

@@ -6,6 +6,9 @@
 // This file is distributed under the University of Illinois Open Source     //
 // License. See LICENSE.TXT for details.                                     //
 //                                                                           //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.              //
+// All rights reserved.                                                      //
+//                                                                           //
 ///
 /// \file                                                                    //
 /// \brief Defines the HLSL type system interface.                           //
@@ -31,6 +34,7 @@
 namespace clang {
 class ASTContext;
 class AttributeList;
+class CXXConstructorDecl;
 class CXXMethodDecl;
 class CXXRecordDecl;
 class ClassTemplateDecl;
@@ -402,6 +406,10 @@ DeclareNodeOrRecordType(clang::ASTContext &Ctx, DXIL::NodeIOKind Type,
                         bool IsCompleteType = false);
 
 #ifdef ENABLE_SPIRV_CODEGEN
+clang::CXXRecordDecl *
+DeclareVkBufferPointerType(clang::ASTContext &context,
+                           clang::DeclContext *declContext);
+
 clang::CXXRecordDecl *DeclareInlineSpirvType(clang::ASTContext &context,
                                              clang::DeclContext *declContext,
                                              llvm::StringRef typeName,
@@ -427,7 +435,7 @@ clang::VarDecl *DeclareBuiltinGlobal(llvm::StringRef name, clang::QualType Ty,
 /// method.</summary> <param name="context">AST context in which to
 /// work.</param> <param name="recordDecl">Class in which the function template
 /// is declared.</param> <param name="functionDecl">Function for which a
-/// template is created.</params> <param
+/// template is created.</param> <param
 /// name="templateParamNamedDecls">Declarations for templates to the
 /// function.</param> <param name="templateParamNamedDeclsCount">Count of
 /// template declarations.</param> <returns>A new function template declaration
@@ -533,6 +541,29 @@ bool DoesTypeDefineOverloadedOperator(clang::QualType typeWithOperator,
                                       clang::QualType paramType);
 bool IsPatchConstantFunctionDecl(const clang::FunctionDecl *FD);
 
+#ifdef ENABLE_SPIRV_CODEGEN
+bool IsVKBufferPointerType(clang::QualType type);
+clang::QualType GetVKBufferPointerBufferType(clang::QualType type);
+unsigned GetVKBufferPointerAlignment(clang::QualType type);
+#endif
+
+/// <summary>Adds a constructor declaration to the specified class
+/// record.</summary> <param name="context">ASTContext that owns
+/// declarations.</param> <param name="recordDecl">Record declaration in which
+/// to add constructor.</param> <param name="resultType">Result type for
+/// constructor.</param> <param name="paramTypes">Types for constructor
+/// parameters.</param> <param name="paramNames">Names for constructor
+/// parameters.</param> <param name="declarationName">Name for
+/// constructor.</param> <param name="isConst">Whether the constructor is a
+/// const function.</param> <returns>The method declaration for the
+/// constructor.</returns>
+clang::CXXConstructorDecl *CreateConstructorDeclarationWithParams(
+    clang::ASTContext &context, clang::CXXRecordDecl *recordDecl,
+    clang::QualType resultType, llvm::ArrayRef<clang::QualType> paramTypes,
+    llvm::ArrayRef<clang::StringRef> paramNames,
+    clang::DeclarationName declarationName, bool isConst,
+    bool isTemplateFunction = false);
+
 /// <summary>Adds a function declaration to the specified class
 /// record.</summary> <param name="context">ASTContext that owns
 /// declarations.</param> <param name="recordDecl">Record declaration in which

tools/clang/include/clang/AST/OperationKinds.h

@@ -5,6 +5,9 @@
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.
+// All rights reserved.
+//
 //===----------------------------------------------------------------------===//
 //
 // This file enumerates the different kinds of operations that can be
@@ -321,6 +324,8 @@ enum CastKind {
   CK_HLSLCC_FloatingToIntegral,
   CK_HLSLCC_FloatingToBoolean,
   CK_HLSLCC_FloatingCast,
+  CK_VK_BufferPointerToIntegral,
+  CK_VK_IntegralToBufferPointer,
 
   // HLSL Change - Made CK_Invalid an enum case because otherwise it is UB to
   // assign it to a value of CastKind.

tools/clang/include/clang/Basic/Attr.td

@@ -5,6 +5,9 @@
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.
+// All rights reserved.
+//
 //===----------------------------------------------------------------------===//
 
 class DocumentationCategory<string name> {
@@ -1447,6 +1450,20 @@ def VKStorageClassExt : InheritableAttr {
   let Documentation = [Undocumented];
 }
 
+def VKBufferPointer : InheritableAttr {
+  let Spellings = [CXX11<"", "hlsl_vk_buffer_pointer", 2021>];
+  let LangOpts = [SPIRV];
+  let Documentation = [Undocumented];
+}
+
+def VKAliasedPointer : InheritableAttr {
+  let Spellings = [CXX11<"vk", "aliased_pointer">];
+  let Subjects = SubjectList<[Var, ParmVar], ErrorDiag>;
+  let Args = [];
+  let LangOpts = [SPIRV];
+  let Documentation = [Undocumented];
+}
+
 // Global variables that are of struct type
 def StructGlobalVar : SubsetSubject<Var, [{S->hasGlobalStorage() && S->getType()->isStructureType()}]>;
 

tools/clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -5,6 +5,9 @@
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.
+// All rights reserved.
+//
 //===----------------------------------------------------------------------===//
 
 //===----------------------------------------------------------------------===//
@@ -7838,7 +7841,7 @@ def warn_hlsl_intrinsic_in_wrong_shader_model : Warning<
    "intrinsic %0 potentially used by '%1' requires shader model %2 or greater">,
     DefaultError, InGroup<HLSLAvailability>;
 def warn_hlsl_intrinsic_overload_in_wrong_shader_model : Warning<
-   "overload of intrinsic %0 requires shader model %1 or greater">, 
+   "overload of intrinsic %0 requires shader model %1 or greater">,
     DefaultError, InGroup<HLSLAvailability>;
 def err_hlsl_intrinsic_template_arg_unsupported: Error<
    "Explicit template arguments on intrinsic %0 are not supported">;
@@ -8004,6 +8007,10 @@ def err_hlsl_hitobject_unsupported_stage : Error<
 
 // SPIRV Change Starts
 def err_hlsl_vulkan_specific_feature: Error<"%0 is a Vulkan specific feature">;
+def err_hlsl_vk_pointer_cast_alignment: Error<
+  "Vulkan buffer pointer cannot be cast to greater alignment">;
+def err_hlsl_vk_static_pointer_cast_type: Error<
+  "vk::static_pointer_cast() content type must be base class of argument's content type">;
 // SPIRV Change Ends
 
 let CategoryName = "OpenMP Issue" in {

tools/clang/include/clang/SPIRV/SpirvBuilder.h

@@ -5,6 +5,9 @@
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.
+// All rights reserved.
+//
 //===----------------------------------------------------------------------===//
 #ifndef LLVM_CLANG_SPIRV_SPIRVBUILDER_H
 #define LLVM_CLANG_SPIRV_SPIRVBUILDER_H
@@ -273,6 +276,14 @@ class SpirvBuilder {
                                                   SpirvInstruction *sample,
                                                   SourceLocation);
 
+  /// \brief Creates an OpConverPtrToU SPIR-V instruction with the given
+  /// parameters.
+  SpirvConvertPtrToU *createConvertPtrToU(SpirvInstruction *ptr, QualType type);
+
+  /// \brief Creates an OpConverUToPtr SPIR-V instruction with the given
+  /// parameters.
+  SpirvConvertUToPtr *createConvertUToPtr(SpirvInstruction *val, QualType type);
+
   /// \brief Creates SPIR-V instructions for sampling the given image.
   ///
   /// If compareVal is given a non-zero value, *Dref* variants of OpImageSample*

tools/clang/include/clang/SPIRV/SpirvContext.h

@@ -5,6 +5,9 @@
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.
+// All rights reserved.
+//
 //===----------------------------------------------------------------------===//
 #ifndef LLVM_CLANG_SPIRV_SPIRVCONTEXT_H
 #define LLVM_CLANG_SPIRV_SPIRVCONTEXT_H
@@ -317,6 +320,13 @@ class SpirvContext {
 
   const HybridPointerType *getPointerType(QualType pointee, spv::StorageClass);
 
+  const ForwardPointerType *getForwardPointerType(QualType pointee);
+
+  const SpirvPointerType *getForwardReference(QualType type);
+
+  void registerForwardReference(QualType type,
+                                const SpirvPointerType *pointerType);
+
   /// Generates (or reuses an existing) OpString for the given string literal.
   SpirvString *getSpirvString(llvm::StringRef str);
 
@@ -478,6 +488,8 @@ class SpirvContext {
   llvm::SmallVector<const HybridStructType *, 8> hybridStructTypes;
   llvm::DenseMap<const SpirvType *, SCToPtrTyMap> pointerTypes;
   llvm::SmallVector<const HybridPointerType *, 8> hybridPointerTypes;
+  llvm::MapVector<QualType, const ForwardPointerType *> forwardPointerTypes;
+  llvm::MapVector<QualType, const SpirvPointerType *> forwardReferences;
   llvm::DenseSet<FunctionType *, FunctionTypeMapInfo> functionTypes;
   llvm::DenseMap<unsigned, SpirvIntrinsicType *> spirvIntrinsicTypesById;
   llvm::SmallVector<const SpirvIntrinsicType *, 8> spirvIntrinsicTypes;

tools/clang/include/clang/SPIRV/SpirvInstruction.h

@@ -4,6 +4,10 @@
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
+//
+// Modifications Copyright(C) 2025 Advanced Micro Devices, Inc.
+// All rights reserved.
+//
 //===----------------------------------------------------------------------===//
 #ifndef LLVM_CLANG_SPIRV_SPIRVINSTRUCTION_H
 #define LLVM_CLANG_SPIRV_SPIRVINSTRUCTION_H
@@ -67,6 +71,10 @@ class SpirvInstruction {
     IK_ConstantComposite,
     IK_ConstantNull,
 
+    // Pointer <-> uint conversions.
+    IK_ConvertPtrToU,
+    IK_ConvertUToPtr,
+
     // OpUndef
     IK_Undef,
 
@@ -1306,6 +1314,50 @@ class SpirvConstantNull : public SpirvConstant {
   bool operator==(const SpirvConstantNull &that) const;
 };
 
+class SpirvConvertPtrToU : public SpirvInstruction {
+public:
+  SpirvConvertPtrToU(SpirvInstruction *ptr, QualType type,
+                     SourceLocation loc = {}, SourceRange range = {});
+
+  DEFINE_RELEASE_MEMORY_FOR_CLASS(SpirvConvertPtrToU)
+
+  // For LLVM-style RTTI
+  static bool classof(const SpirvInstruction *inst) {
+    return inst->getKind() == IK_ConvertPtrToU;
+  }
+
+  bool operator==(const SpirvConvertPtrToU &that) const;
+
+  bool invokeVisitor(Visitor *v) override;
+
+  SpirvInstruction *getPtr() const { return ptr; }
+
+private:
+  SpirvInstruction *ptr;
+};
+
+class SpirvConvertUToPtr : public SpirvInstruction {
+public:
+  SpirvConvertUToPtr(SpirvInstruction *intValue, QualType type,
+                     SourceLocation loc = {}, SourceRange range = {});
+
+  DEFINE_RELEASE_MEMORY_FOR_CLASS(SpirvConvertUToPtr)
+
+  // For LLVM-style RTTI
+  static bool classof(const SpirvInstruction *inst) {
+    return inst->getKind() == IK_ConvertUToPtr;
+  }
+
+  bool operator==(const SpirvConvertUToPtr &that) const;
+
+  bool invokeVisitor(Visitor *v) override;
+
+  SpirvInstruction *getVal() const { return val; }
+
+private:
+  SpirvInstruction *val;
+};
+
 class SpirvUndef : public SpirvInstruction {
 public:
   SpirvUndef(QualType type);