[clang] Introduce SemaHLSL (#87912)

This patch introduces `SemaHLSL` class, and moves some HLSL-related
functions there. No functional changes intended.

Removing "HLSL" from function names inside `SemaHLSL` is left for a
subsequent PR by HLSL contributors, if they deem that desirable.

This is a part of the effort to split `Sema` into smaller manageable
parts, and follows the example of OpenACC. See #82217, #84184, #87634
for additional context.

Author: Endilll

clang/include/clang/Sema/Sema.h

@@ -182,6 +182,7 @@ class Preprocessor;
 class PseudoDestructorTypeStorage;
 class PseudoObjectExpr;
 class QualType;
+class SemaHLSL;
 class SemaOpenACC;
 class StandardConversionSequence;
 class Stmt;
@@ -465,9 +466,8 @@ class Sema final : public SemaBase {
   // 36. FixIt Helpers (SemaFixItUtils.cpp)
   // 37. Name Lookup for RISC-V Vector Intrinsic (SemaRISCVVectorLookup.cpp)
   // 38. CUDA (SemaCUDA.cpp)
-  // 39. HLSL Constructs (SemaHLSL.cpp)
-  // 40. OpenMP Directives and Clauses (SemaOpenMP.cpp)
-  // 41. SYCL Constructs (SemaSYCL.cpp)
+  // 39. OpenMP Directives and Clauses (SemaOpenMP.cpp)
+  // 40. SYCL Constructs (SemaSYCL.cpp)
 
   /// \name Semantic Analysis
   /// Implementations are in Sema.cpp
@@ -964,6 +964,11 @@ class Sema final : public SemaBase {
   /// CurContext - This is the current declaration context of parsing.
   DeclContext *CurContext;
 
+  SemaHLSL &HLSL() {
+    assert(HLSLPtr);
+    return *HLSLPtr;
+  }
+
   SemaOpenACC &OpenACC() {
     assert(OpenACCPtr);
     return *OpenACCPtr;
@@ -999,6 +1004,7 @@ class Sema final : public SemaBase {
 
   mutable IdentifierInfo *Ident_super;
 
+  std::unique_ptr<SemaHLSL> HLSLPtr;
   std::unique_ptr<SemaOpenACC> OpenACCPtr;
 
   ///@}
@@ -1967,6 +1973,11 @@ class Sema final : public SemaBase {
   bool CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
                          const FunctionProtoType *Proto);
 
+  bool BuiltinVectorMath(CallExpr *TheCall, QualType &Res);
+  bool BuiltinVectorToScalarMath(CallExpr *TheCall);
+
+  bool CheckHLSLBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
+
 private:
   void CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
                         const ArraySubscriptExpr *ASE = nullptr,
@@ -13145,29 +13156,6 @@ class Sema final : public SemaBase {
   //
   //
 
-  /// \name HLSL Constructs
-  /// Implementations are in SemaHLSL.cpp
-  ///@{
-
-public:
-  Decl *ActOnStartHLSLBuffer(Scope *BufferScope, bool CBuffer,
-                             SourceLocation KwLoc, IdentifierInfo *Ident,
-                             SourceLocation IdentLoc, SourceLocation LBrace);
-  void ActOnFinishHLSLBuffer(Decl *Dcl, SourceLocation RBrace);
-
-  bool CheckHLSLBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
-
-  bool BuiltinVectorMath(CallExpr *TheCall, QualType &Res);
-  bool BuiltinVectorToScalarMath(CallExpr *TheCall);
-
-  ///@}
-
-  //
-  //
-  // -------------------------------------------------------------------------
-  //
-  //
-
   /// \name OpenMP Directives and Clauses
   /// Implementations are in SemaOpenMP.cpp
   ///@{

clang/include/clang/Sema/SemaHLSL.h

@@ -0,0 +1,37 @@
+//===----- SemaHLSL.h ----- Semantic Analysis for HLSL constructs ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file declares semantic analysis for HLSL constructs.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_SEMAHLSL_H
+#define LLVM_CLANG_SEMA_SEMAHLSL_H
+
+#include "clang/AST/DeclBase.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Sema/Scope.h"
+#include "clang/Sema/SemaBase.h"
+
+namespace clang {
+
+class SemaHLSL : public SemaBase {
+public:
+  SemaHLSL(Sema &S);
+
+  Decl *ActOnStartHLSLBuffer(Scope *BufferScope, bool CBuffer,
+                             SourceLocation KwLoc, IdentifierInfo *Ident,
+                             SourceLocation IdentLoc, SourceLocation LBrace);
+  void ActOnFinishHLSLBuffer(Decl *Dcl, SourceLocation RBrace);
+};
+
+} // namespace clang
+
+#endif // LLVM_CLANG_SEMA_SEMAHLSL_H

clang/lib/Parse/ParseHLSL.cpp

@@ -15,6 +15,7 @@
 #include "clang/Parse/ParseDiagnostic.h"
 #include "clang/Parse/Parser.h"
 #include "clang/Parse/RAIIObjectsForParser.h"
+#include "clang/Sema/SemaHLSL.h"
 
 using namespace clang;
 
@@ -71,9 +72,9 @@ Decl *Parser::ParseHLSLBuffer(SourceLocation &DeclEnd) {
     return nullptr;
   }
 
-  Decl *D = Actions.ActOnStartHLSLBuffer(getCurScope(), IsCBuffer, BufferLoc,
-                                         Identifier, IdentifierLoc,
-                                         T.getOpenLocation());
+  Decl *D = Actions.HLSL().ActOnStartHLSLBuffer(
+      getCurScope(), IsCBuffer, BufferLoc, Identifier, IdentifierLoc,
+      T.getOpenLocation());
 
   while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
     // FIXME: support attribute on constants inside cbuffer/tbuffer.
@@ -87,15 +88,15 @@ Decl *Parser::ParseHLSLBuffer(SourceLocation &DeclEnd) {
       T.skipToEnd();
       DeclEnd = T.getCloseLocation();
       BufferScope.Exit();
-      Actions.ActOnFinishHLSLBuffer(D, DeclEnd);
+      Actions.HLSL().ActOnFinishHLSLBuffer(D, DeclEnd);
       return nullptr;
     }
   }
 
   T.consumeClose();
   DeclEnd = T.getCloseLocation();
   BufferScope.Exit();
-  Actions.ActOnFinishHLSLBuffer(D, DeclEnd);
+  Actions.HLSL().ActOnFinishHLSLBuffer(D, DeclEnd);
 
   Actions.ProcessDeclAttributeList(Actions.CurScope, D, Attrs);
   return D;

clang/lib/Sema/Sema.cpp

@@ -42,6 +42,7 @@
 #include "clang/Sema/Scope.h"
 #include "clang/Sema/ScopeInfo.h"
 #include "clang/Sema/SemaConsumer.h"
+#include "clang/Sema/SemaHLSL.h"
 #include "clang/Sema/SemaInternal.h"
 #include "clang/Sema/SemaOpenACC.h"
 #include "clang/Sema/TemplateDeduction.h"
@@ -198,6 +199,7 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
       LateTemplateParser(nullptr), LateTemplateParserCleanup(nullptr),
       OpaqueParser(nullptr), CurContext(nullptr), ExternalSource(nullptr),
       CurScope(nullptr), Ident_super(nullptr),
+      HLSLPtr(std::make_unique<SemaHLSL>(*this)),
       OpenACCPtr(std::make_unique<SemaOpenACC>(*this)),
       MSPointerToMemberRepresentationMethod(
           LangOpts.getMSPointerToMemberRepresentationMethod()),

clang/lib/Sema/SemaHLSL.cpp

@@ -8,27 +8,31 @@
 // This implements Semantic Analysis for HLSL constructs.
 //===----------------------------------------------------------------------===//
 
+#include "clang/Sema/SemaHLSL.h"
 #include "clang/Sema/Sema.h"
 
 using namespace clang;
 
-Decl *Sema::ActOnStartHLSLBuffer(Scope *BufferScope, bool CBuffer,
-                                 SourceLocation KwLoc, IdentifierInfo *Ident,
-                                 SourceLocation IdentLoc,
-                                 SourceLocation LBrace) {
+SemaHLSL::SemaHLSL(Sema &S) : SemaBase(S) {}
+
+Decl *SemaHLSL::ActOnStartHLSLBuffer(Scope *BufferScope, bool CBuffer,
+                                     SourceLocation KwLoc,
+                                     IdentifierInfo *Ident,
+                                     SourceLocation IdentLoc,
+                                     SourceLocation LBrace) {
   // For anonymous namespace, take the location of the left brace.
-  DeclContext *LexicalParent = getCurLexicalContext();
+  DeclContext *LexicalParent = SemaRef.getCurLexicalContext();
   HLSLBufferDecl *Result = HLSLBufferDecl::Create(
-      Context, LexicalParent, CBuffer, KwLoc, Ident, IdentLoc, LBrace);
+      getASTContext(), LexicalParent, CBuffer, KwLoc, Ident, IdentLoc, LBrace);
 
-  PushOnScopeChains(Result, BufferScope);
-  PushDeclContext(BufferScope, Result);
+  SemaRef.PushOnScopeChains(Result, BufferScope);
+  SemaRef.PushDeclContext(BufferScope, Result);
 
   return Result;
 }
 
-void Sema::ActOnFinishHLSLBuffer(Decl *Dcl, SourceLocation RBrace) {
+void SemaHLSL::ActOnFinishHLSLBuffer(Decl *Dcl, SourceLocation RBrace) {
   auto *BufDecl = cast<HLSLBufferDecl>(Dcl);
   BufDecl->setRBraceLoc(RBrace);
-  PopDeclContext();
+  SemaRef.PopDeclContext();
 }