[flang][NFC] Clean up code in two new functions (#142037)

Two recently-added functions in Semantics/tools.h need some cleaning up
to conform to the coding style of the project. One of them should
actually be in Parser/tools.{h,cpp}, the other doesn't need to be
defined in the header.

flang/include/flang/Parser/tools.h

@@ -250,5 +250,8 @@ template <typename A> std::optional<CharBlock> GetLastSource(A &x) {
   return GetSourceHelper<false>::GetSource(const_cast<const A &>(x));
 }
 
+// Checks whether the assignment statement has a single variable on the RHS.
+bool CheckForSingleVariableOnRHS(const AssignmentStmt &);
+
 } // namespace Fortran::parser
 #endif // FORTRAN_PARSER_TOOLS_H_

flang/include/flang/Semantics/tools.h

@@ -756,29 +756,7 @@ std::string GetCommonBlockObjectName(const Symbol &, bool underscoring);
 // Check for ambiguous USE associations
 bool HadUseError(SemanticsContext &, SourceName at, const Symbol *);
 
-/// Checks if the assignment statement has a single variable on the RHS.
-inline bool checkForSingleVariableOnRHS(
-    const Fortran::parser::AssignmentStmt &assignmentStmt) {
-  const Fortran::parser::Expr &expr{
-      std::get<Fortran::parser::Expr>(assignmentStmt.t)};
-  const Fortran::common::Indirection<Fortran::parser::Designator> *designator =
-      std::get_if<Fortran::common::Indirection<Fortran::parser::Designator>>(
-          &expr.u);
-  return designator != nullptr;
-}
-
-/// Checks if the symbol on the LHS is present in the RHS expression.
-inline bool checkForSymbolMatch(const Fortran::semantics::SomeExpr *lhs,
-    const Fortran::semantics::SomeExpr *rhs) {
-  auto lhsSyms{Fortran::evaluate::GetSymbolVector(*lhs)};
-  const Fortran::semantics::Symbol &lhsSymbol{*lhsSyms.front()};
-  for (const Fortran::semantics::Symbol &symbol :
-      Fortran::evaluate::GetSymbolVector(*rhs)) {
-    if (lhsSymbol == symbol) {
-      return true;
-    }
-  }
-  return false;
-}
+// Checks whether the symbol on the LHS is present in the RHS expression.
+bool CheckForSymbolMatch(const SomeExpr *lhs, const SomeExpr *rhs);
 } // namespace Fortran::semantics
 #endif // FORTRAN_SEMANTICS_TOOLS_H_

flang/lib/Lower/OpenACC.cpp

@@ -653,8 +653,8 @@ void genAtomicCapture(Fortran::lower::AbstractConverter &converter,
   firOpBuilder.createBlock(&(atomicCaptureOp->getRegion(0)));
   mlir::Block &block = atomicCaptureOp->getRegion(0).back();
   firOpBuilder.setInsertionPointToStart(&block);
-  if (Fortran::semantics::checkForSingleVariableOnRHS(stmt1)) {
-    if (Fortran::semantics::checkForSymbolMatch(
+  if (Fortran::parser::CheckForSingleVariableOnRHS(stmt1)) {
+    if (Fortran::semantics::CheckForSymbolMatch(
             Fortran::semantics::GetExpr(stmt2Var),
             Fortran::semantics::GetExpr(stmt2Expr))) {
       // Atomic capture construct is of the form [capture-stmt, update-stmt]

flang/lib/Lower/OpenMP/OpenMP.cpp

@@ -3200,8 +3200,8 @@ static void genAtomicCapture(lower::AbstractConverter &converter,
   firOpBuilder.createBlock(&(atomicCaptureOp->getRegion(0)));
   mlir::Block &block = atomicCaptureOp->getRegion(0).back();
   firOpBuilder.setInsertionPointToStart(&block);
-  if (semantics::checkForSingleVariableOnRHS(stmt1)) {
-    if (semantics::checkForSymbolMatch(semantics::GetExpr(stmt2Var),
+  if (parser::CheckForSingleVariableOnRHS(stmt1)) {
+    if (semantics::CheckForSymbolMatch(semantics::GetExpr(stmt2Var),
                                        semantics::GetExpr(stmt2Expr))) {
       // Atomic capture construct is of the form [capture-stmt, update-stmt]
       const semantics::SomeExpr &fromExpr = *semantics::GetExpr(stmt1Expr);

flang/lib/Parser/tools.cpp

@@ -174,4 +174,9 @@ const CoindexedNamedObject *GetCoindexedNamedObject(
       },
       allocateObject.u);
 }
+
+bool CheckForSingleVariableOnRHS(const AssignmentStmt &assignmentStmt) {
+  return Unwrap<Designator>(std::get<Expr>(assignmentStmt.t)) != nullptr;
+}
+
 } // namespace Fortran::parser

flang/lib/Semantics/check-omp-structure.cpp

@@ -2933,9 +2933,9 @@ void OmpStructureChecker::CheckAtomicCaptureConstruct(
   const auto *e2 = GetExpr(context_, stmt2Expr);
 
   if (e1 && v1 && e2 && v2) {
-    if (semantics::checkForSingleVariableOnRHS(stmt1)) {
+    if (parser::CheckForSingleVariableOnRHS(stmt1)) {
       CheckAtomicCaptureStmt(stmt1);
-      if (semantics::checkForSymbolMatch(v2, e2)) {
+      if (CheckForSymbolMatch(v2, e2)) {
         // ATOMIC CAPTURE construct is of the form [capture-stmt, update-stmt]
         CheckAtomicUpdateStmt(stmt2);
       } else {
@@ -2947,8 +2947,8 @@ void OmpStructureChecker::CheckAtomicCaptureConstruct(
             "Captured variable/array element/derived-type component %s expected to be assigned in the second statement of ATOMIC CAPTURE construct"_err_en_US,
             stmt1Expr.source);
       }
-    } else if (semantics::checkForSymbolMatch(v1, e1) &&
-        semantics::checkForSingleVariableOnRHS(stmt2)) {
+    } else if (CheckForSymbolMatch(v1, e1) &&
+        parser::CheckForSingleVariableOnRHS(stmt2)) {
       // ATOMIC CAPTURE construct is of the form [update-stmt, capture-stmt]
       CheckAtomicUpdateStmt(stmt1);
       CheckAtomicCaptureStmt(stmt2);

flang/lib/Semantics/tools.cpp

@@ -1788,4 +1788,18 @@ bool HadUseError(
   }
 }
 
+bool CheckForSymbolMatch(const SomeExpr *lhs, const SomeExpr *rhs) {
+  if (lhs && rhs) {
+    if (SymbolVector lhsSymbols{evaluate::GetSymbolVector(*lhs)};
+        !lhsSymbols.empty()) {
+      const Symbol &first{*lhsSymbols.front()};
+      for (const Symbol &symbol : evaluate::GetSymbolVector(*rhs)) {
+        if (first == symbol) {
+          return true;
+        }
+      }
+    }
+  }
+  return false;
+}
 } // namespace Fortran::semantics