[clang] [flang] [llvm] [CLANG][OpenMP] Add support for OpenMP6.0 transparent clause (PR #166810)

[Alexey Bataev via llvm-commits]

================
@@ -1495,6 +1495,78 @@ class OMPThreadsetClause final : public OMPClause {
   }
 };
 
+/// This class represents the 'transparent' clause in the '#pragma omp task'
+/// directive.
+///
+/// \code
+/// #pragma omp task transparent(omp_not_impex)
+/// \endcode
+///
+/// In this example, the directive '#pragma omp task' has a 'transparent'
+/// clause with OpenMP keyword 'omp_not_impex`. Other valid keywords that may
+/// appear in this clause are 'omp_import', 'omp_export' and 'omp_impex'.
+///
+class OMPTransparentClause final : public OMPClause {
+  friend class OMPClauseReader;
+
+  /// Location of '('.
+  SourceLocation LParenLoc;
+
+  /// Argument of the 'transparent' clause.
+  Expr *ImpexType = nullptr;
+
+  /// Sets the location of '('.
+  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }
+
+  void setImpexTypeKind(Expr *E) { ImpexType = E; }
+
+public:
+  /// Build 'transparent' clause with argument \a A ('omp_not_impex',
+  /// 'omp_import', 'omp_export' or 'omp_impex')
+  ///
+  /// \param A Argument of the clause ('omp_not_impex', 'omp_import',
+  /// 'omp_export' or 'omp_impex')
+  /// \param ALoc Starting location of the argument.
+  /// \param StartLoc Starting location of the clause.
+  /// \param LParenLoc Location of '('.
+  /// \param EndLoc Ending location of the clause.
+  OMPTransparentClause(Expr *ImpexTypeKind, SourceLocation StartLoc,
+                       SourceLocation LParenLoc, SourceLocation EndLoc)
+      : OMPClause(llvm::omp::OMPC_transparent, StartLoc, EndLoc),
+        LParenLoc(LParenLoc), ImpexType(ImpexTypeKind) {}
+
+  /// Build an empty clause.
+  OMPTransparentClause()
+      : OMPClause(llvm::omp::OMPC_transparent, SourceLocation(),
+                  SourceLocation()) {}
+
+  /// Returns the location of '('.
+  SourceLocation getLParenLoc() const { return LParenLoc; }
+
+  /// Returns argument of the clause.
+  Expr *getImpexType() const { return cast<Expr>(ImpexType); }
----------------
alexey-bataev wrote:

```suggestion
  Expr *getImpexType() const { return ImpexType; }
```

https://github.com/llvm/llvm-project/pull/166810