1 files changed, 97 insertions, 0 deletions
diff --git a/flang/lib/Utils/OpenMP.cpp b/flang/lib/Utils/OpenMP.cpp
index c2036c4a383f..a0a67249f7f0 100644
--- a/flang/lib/Utils/OpenMP.cpp
+++ b/flang/lib/Utils/OpenMP.cpp
@@ -155,4 +155,101 @@ void cloneOrMapRegionOutsiders(
     mlir::getUsedValuesDefinedAbove(region, valuesDefinedAbove);
   }
 }
+
+mlir::FlatSymbolRefAttr getOrGenImplicitDefaultDeclareMapper(
+    fir::FirOpBuilder &firOpBuilder, mlir::Location loc,
+    fir::RecordType recordType, llvm::StringRef mapperNameStr,
+    RecordMemberMapperMangler mangler) {
+  if (mapperNameStr.empty())
+    return {};
+
+  mlir::ModuleOp moduleOp = firOpBuilder.getModule();
+  if (moduleOp.lookupSymbol(mapperNameStr))
+    return mlir::FlatSymbolRefAttr::get(
+        firOpBuilder.getContext(), mapperNameStr);
+
+  mlir::OpBuilder::InsertionGuard guard(firOpBuilder);
+
+  firOpBuilder.setInsertionPointToStart(moduleOp.getBody());
+  auto declMapperOp = mlir::omp::DeclareMapperOp::create(
+      firOpBuilder, loc, mapperNameStr, recordType);
+  auto &region = declMapperOp.getRegion();
+  firOpBuilder.createBlock(&region);
+  auto mapperArg = region.addArgument(firOpBuilder.getRefType(recordType), loc);
+
+  auto declareOp = hlfir::DeclareOp::create(firOpBuilder, loc, mapperArg,
+      /*uniq_name=*/"");
+
+  const auto genBoundsOps = [&](mlir::Value mapVal,
+                                llvm::SmallVectorImpl<mlir::Value> &bounds) {
+    fir::ExtendedValue extVal = hlfir::translateToExtendedValue(mapVal.getLoc(),
+        firOpBuilder, hlfir::Entity{mapVal},
+        /*contiguousHint=*/true)
+                                    .first;
+    fir::factory::AddrAndBoundsInfo info = fir::factory::getDataOperandBaseAddr(
+        firOpBuilder, mapVal, /*isOptional=*/false, mapVal.getLoc());
+    bounds = fir::factory::genImplicitBoundsOps<mlir::omp::MapBoundsOp,
+        mlir::omp::MapBoundsType>(firOpBuilder, info, extVal,
+        /*dataExvIsAssumedSize=*/false, mapVal.getLoc());
+  };
+
+  const auto getFieldRef = [&](mlir::Value rec, llvm::StringRef fieldName,
+                               mlir::Type fieldTy, mlir::Type recType) {
+    mlir::Value field = fir::FieldIndexOp::create(firOpBuilder, loc,
+        fir::FieldType::get(recType.getContext()), fieldName, recType,
+        fir::getTypeParams(rec));
+    return fir::CoordinateOp::create(
+        firOpBuilder, loc, firOpBuilder.getRefType(fieldTy), rec, field);
+  };
+
+  llvm::SmallVector<mlir::Value> clauseMapVars;
+  llvm::SmallVector<llvm::SmallVector<int64_t>> memberPlacementIndices;
+  llvm::SmallVector<mlir::Value> memberMapOps;
+
+  mlir::omp::ClauseMapFlags mapFlag = mlir::omp::ClauseMapFlags::to |
+      mlir::omp::ClauseMapFlags::from | mlir::omp::ClauseMapFlags::implicit;
+  mlir::omp::VariableCaptureKind captureKind =
+      mlir::omp::VariableCaptureKind::ByRef;
+
+  for (const auto &entry : llvm::enumerate(recordType.getTypeList())) {
+    const auto &memberName = entry.value().first;
+    const auto &memberType = entry.value().second;
+    mlir::FlatSymbolRefAttr mapperId;
+    if (auto recType = mlir::dyn_cast<fir::RecordType>(
+            fir::getFortranElementType(memberType))) {
+      std::string mapperIdName =
+          recType.getName().str() + llvm::omp::OmpDefaultMapperName;
+      mangler(mapperIdName, memberName);
+      mapperId = getOrGenImplicitDefaultDeclareMapper(
+          firOpBuilder, loc, recType, mapperIdName, mangler);
+    }
+
+    auto ref =
+        getFieldRef(declareOp.getBase(), memberName, memberType, recordType);
+    llvm::SmallVector<mlir::Value> bounds;
+    genBoundsOps(ref, bounds);
+    mlir::Value mapOp = Fortran::utils::openmp::createMapInfoOp(firOpBuilder,
+        loc, ref, /*varPtrPtr=*/mlir::Value{}, /*name=*/"", bounds,
+        /*members=*/{},
+        /*membersIndex=*/mlir::ArrayAttr{}, mapFlag, captureKind, ref.getType(),
+        /*partialMap=*/false, mapperId);
+    memberMapOps.emplace_back(mapOp);
+    memberPlacementIndices.emplace_back(
+        llvm::SmallVector<int64_t>{(int64_t)entry.index()});
+  }
+
+  llvm::SmallVector<mlir::Value> bounds;
+  genBoundsOps(declareOp.getOriginalBase(), bounds);
+  mlir::omp::ClauseMapFlags parentMapFlag = mlir::omp::ClauseMapFlags::implicit;
+  mlir::omp::MapInfoOp mapOp = Fortran::utils::openmp::createMapInfoOp(
+      firOpBuilder, loc, declareOp.getOriginalBase(),
+      /*varPtrPtr=*/mlir::Value(), /*name=*/"", bounds, memberMapOps,
+      firOpBuilder.create2DI64ArrayAttr(memberPlacementIndices), parentMapFlag,
+      captureKind, declareOp.getType(0),
+      /*partialMap=*/true);
+
+  clauseMapVars.emplace_back(mapOp);
+  mlir::omp::DeclareMapperInfoOp::create(firOpBuilder, loc, clauseMapVars);
+  return mlir::FlatSymbolRefAttr::get(firOpBuilder.getContext(), mapperNameStr);
+}
 } // namespace Fortran::utils::openmp