[Flang][OpenMP] Process motion clauses in a single call (NFC) (#108046)

This patch removes the template parameter of the
`ClauseProcessor::processMotionClauses()` method and instead processes
both `TO` and `FROM` as part of a single call. This also enables moving
the implementation out of the header and makes it simpler for a
follow-up patch to potentially refactor `processMap()`,
`processMotionClauses()`, `processUseDeviceAddr()` and
`processUseDevicePtr()`, and minimize code duplication among these.

Author: skatrak

flang/lib/Lower/OpenMP/ClauseProcessor.cpp

@@ -1009,6 +1009,37 @@ bool ClauseProcessor::processMap(
   return clauseFound;
 }
 
+bool ClauseProcessor::processMotionClauses(lower::StatementContext &stmtCtx,
+                                           mlir::omp::MapClauseOps &result) {
+  std::map<const semantics::Symbol *,
+           llvm::SmallVector<OmpMapMemberIndicesData>>
+      parentMemberIndices;
+  llvm::SmallVector<const semantics::Symbol *> mapSymbols;
+
+  auto callbackFn = [&](const auto &clause, const parser::CharBlock &source) {
+    mlir::Location clauseLocation = converter.genLocation(source);
+
+    // TODO Support motion modifiers: present, mapper, iterator.
+    constexpr llvm::omp::OpenMPOffloadMappingFlags mapTypeBits =
+        std::is_same_v<llvm::remove_cvref_t<decltype(clause)>, omp::clause::To>
+            ? llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_TO
+            : llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_FROM;
+
+    processMapObjects(stmtCtx, clauseLocation, std::get<ObjectList>(clause.t),
+                      mapTypeBits, parentMemberIndices, result.mapVars,
+                      &mapSymbols);
+  };
+
+  bool clauseFound = findRepeatableClause<omp::clause::To>(callbackFn);
+  clauseFound =
+      findRepeatableClause<omp::clause::From>(callbackFn) || clauseFound;
+
+  insertChildMapInfoIntoParent(converter, parentMemberIndices, result.mapVars,
+                               mapSymbols,
+                               /*mapSymTypes=*/nullptr, /*mapSymLocs=*/nullptr);
+  return clauseFound;
+}
+
 bool ClauseProcessor::processNontemporal(
     mlir::omp::NontemporalClauseOps &result) const {
   return findRepeatableClause<omp::clause::Nontemporal>(

flang/lib/Lower/OpenMP/ClauseProcessor.h

@@ -121,6 +121,8 @@ class ClauseProcessor {
       llvm::SmallVectorImpl<const semantics::Symbol *> *mapSyms = nullptr,
       llvm::SmallVectorImpl<mlir::Location> *mapSymLocs = nullptr,
       llvm::SmallVectorImpl<mlir::Type> *mapSymTypes = nullptr) const;
+  bool processMotionClauses(lower::StatementContext &stmtCtx,
+                            mlir::omp::MapClauseOps &result);
   bool processNontemporal(mlir::omp::NontemporalClauseOps &result) const;
   bool processReduction(
       mlir::Location currentLocation, mlir::omp::ReductionClauseOps &result,
@@ -141,9 +143,6 @@ class ClauseProcessor {
       llvm::SmallVectorImpl<mlir::Location> &useDeviceLocs,
       llvm::SmallVectorImpl<const semantics::Symbol *> &useDeviceSyms) const;
 
-  template <typename T>
-  bool processMotionClauses(lower::StatementContext &stmtCtx,
-                            mlir::omp::MapClauseOps &result);
   // Call this method for these clauses that should be supported but are not
   // implemented yet. It triggers a compilation error if any of the given
   // clauses is found.
@@ -191,38 +190,6 @@ class ClauseProcessor {
   List<Clause> clauses;
 };
 
-template <typename T>
-bool ClauseProcessor::processMotionClauses(lower::StatementContext &stmtCtx,
-                                           mlir::omp::MapClauseOps &result) {
-  std::map<const semantics::Symbol *,
-           llvm::SmallVector<OmpMapMemberIndicesData>>
-      parentMemberIndices;
-  llvm::SmallVector<const semantics::Symbol *> mapSymbols;
-
-  bool clauseFound = findRepeatableClause<T>(
-      [&](const T &clause, const parser::CharBlock &source) {
-        mlir::Location clauseLocation = converter.genLocation(source);
-
-        static_assert(std::is_same_v<T, omp::clause::To> ||
-                      std::is_same_v<T, omp::clause::From>);
-
-        // TODO Support motion modifiers: present, mapper, iterator.
-        constexpr llvm::omp::OpenMPOffloadMappingFlags mapTypeBits =
-            std::is_same_v<T, omp::clause::To>
-                ? llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_TO
-                : llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_FROM;
-
-        processMapObjects(stmtCtx, clauseLocation,
-                          std::get<ObjectList>(clause.t), mapTypeBits,
-                          parentMemberIndices, result.mapVars, &mapSymbols);
-      });
-
-  insertChildMapInfoIntoParent(converter, parentMemberIndices, result.mapVars,
-                               mapSymbols,
-                               /*mapSymTypes=*/nullptr, /*mapSymLocs=*/nullptr);
-  return clauseFound;
-}
-
 template <typename... Ts>
 void ClauseProcessor::processTODO(mlir::Location currentLocation,
                                   llvm::omp::Directive directive) const {

flang/lib/Lower/OpenMP/OpenMP.cpp

@@ -1223,12 +1223,10 @@ static void genTargetEnterExitUpdateDataClauses(
   cp.processDevice(stmtCtx, clauseOps);
   cp.processIf(directive, clauseOps);
 
-  if (directive == llvm::omp::Directive::OMPD_target_update) {
-    cp.processMotionClauses<clause::To>(stmtCtx, clauseOps);
-    cp.processMotionClauses<clause::From>(stmtCtx, clauseOps);
-  } else {
+  if (directive == llvm::omp::Directive::OMPD_target_update)
+    cp.processMotionClauses(stmtCtx, clauseOps);
+  else
     cp.processMap(loc, stmtCtx, clauseOps);
-  }
 
   cp.processNowait(clauseOps);
 }