[clang] [llvm] [OpenMP 60] Update parsing and semantic support for `nowait` clause to accept optional argument (PR #159628)

[Fazlay Rabbi via llvm-commits]

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@@ -2217,18 +2217,62 @@ class OMPOrderedClause final
 /// This represents 'nowait' clause in the '#pragma omp ...' directive.
 ///
 /// \code
-/// #pragma omp for nowait
+/// #pragma omp for nowait (cond)
 /// \endcode
-/// In this example directive '#pragma omp for' has 'nowait' clause.
-class OMPNowaitClause final : public OMPNoChildClause<llvm::omp::OMPC_nowait> {
+/// In this example directive '#pragma omp for' has simple 'nowait' clause with
+/// condition 'cond'.
+class OMPNowaitClause final : public OMPClause {
+  friend class OMPClauseReader;
+
+  /// Location of '('.
+  SourceLocation LParenLoc;
+
+  /// Condition of the 'nowait' clause.
+  Stmt *Condition = nullptr;
+
+  /// Set condition.
+  void setCondition(Expr *Cond) { Condition = Cond; }
+
 public:
-  /// Build 'nowait' clause.
+  /// Build 'nowait' clause with condition \a Cond.
   ///
+  /// \param Cond Condition of the clause.
   /// \param StartLoc Starting location of the clause.
+  /// \param LParenLoc Location of '('.
   /// \param EndLoc Ending location of the clause.
-  OMPNowaitClause(SourceLocation StartLoc = SourceLocation(),
-                  SourceLocation EndLoc = SourceLocation())
-      : OMPNoChildClause(StartLoc, EndLoc) {}
+  OMPNowaitClause(Expr *Cond, SourceLocation StartLoc, SourceLocation LParenLoc,
+                  SourceLocation EndLoc)
+      : OMPClause(llvm::omp::OMPC_nowait, StartLoc, EndLoc),
+        LParenLoc(LParenLoc), Condition(Cond) {}
+
+  /// Build an empty clause.
+  OMPNowaitClause()
+      : OMPClause(llvm::omp::OMPC_nowait, SourceLocation(), SourceLocation()) {}
+
+  /// Sets the location of '('.
+  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }
+
+  /// Returns the location of '('.
+  SourceLocation getLParenLoc() const { return LParenLoc; }
+
+  /// Returns condition.
+  Expr *getCondition() const { return cast_or_null<Expr>(Condition); }
+
+  child_range children() { return child_range(&Condition, &Condition + 1); }
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mdfazlay wrote:

Done. Please take a look.

https://github.com/llvm/llvm-project/pull/159628