[llvm-branch-commits] [Flang][OpenMP][MLIR] Extend derived (record) type map support in Flang OpenMP by adding some initial support for explicit member mapping (PR #81511)

[Kareem Ergawy via llvm-branch-commits]

================
@@ -1841,14 +1867,112 @@ createMapInfoOp(fir::FirOpBuilder &builder, mlir::Location loc,
       llvm::cast<mlir::omp::PointerLikeType>(retTy).getElementType());
 
   mlir::omp::MapInfoOp op = builder.create<mlir::omp::MapInfoOp>(
-      loc, retTy, baseAddr, varType, varPtrPtr, members, bounds,
+      loc, retTy, baseAddr, varType, varPtrPtr, members, membersIndex, bounds,
       builder.getIntegerAttr(builder.getIntegerType(64, false), mapType),
       builder.getAttr<mlir::omp::VariableCaptureKindAttr>(mapCaptureType),
-      builder.getStringAttr(name));
+      builder.getStringAttr(name), builder.getBoolAttr(partialMap));
 
   return op;
 }
 
+int findComponenetMemberPlacement(
+    const Fortran::semantics::Symbol *dTypeSym,
+    const Fortran::semantics::Symbol *componentSym) {
+  int placement = -1;
+  if (const auto *derived{
+          dTypeSym->detailsIf<Fortran::semantics::DerivedTypeDetails>()}) {
+    for (auto t : derived->componentNames()) {
+      placement++;
+      if (t == componentSym->name())
+        return placement;
+    }
+  }
+  return placement;
+}
+
+static void
+checkAndApplyDeclTargetMapFlags(Fortran::lower::AbstractConverter &converter,
+                                llvm::omp::OpenMPOffloadMappingFlags &mapFlags,
+                                Fortran::semantics::Symbol *symbol) {
+  mlir::Operation *op =
+      converter.getModuleOp().lookupSymbol(converter.mangleName(*symbol));
+  if (op)
+    if (auto declareTargetOp =
+            llvm::dyn_cast<mlir::omp::DeclareTargetInterface>(op)) {
+      // only Link clauses have OMP_MAP_PTR_AND_OBJ applied, To clause
+      // functions fairly different.
+      if (declareTargetOp.getDeclareTargetCaptureClause() ==
+          mlir::omp::DeclareTargetCaptureClause::link)
+        mapFlags |= llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_PTR_AND_OBJ;
+    }
+}
+
+static void insertChildMapInfoIntoParent(
+    Fortran::lower::AbstractConverter &converter,
+    llvm::SmallVector<const Fortran::semantics::Symbol *> &memberParentSyms,
+    llvm::SmallVector<mlir::Value> &memberMaps,
+    llvm::SmallVector<mlir::Attribute> &memberPlacementIndices,
+    llvm::SmallVectorImpl<mlir::Value> &mapOperands,
+    llvm::SmallVectorImpl<mlir::Type> *mapSymTypes,
+    llvm::SmallVectorImpl<mlir::Location> *mapSymLocs,
+    llvm::SmallVectorImpl<const Fortran::semantics::Symbol *> *mapSymbols) {
+  // TODO: For multi-nested record types the top level parent is currently
+  // the containing parent for all member operations.
+  for (auto [idx, sym] : llvm::enumerate(memberParentSyms)) {
+    bool parentExists = false;
+    size_t parentIdx = 0;
+    for (size_t i = 0; i < mapSymbols->size(); ++i) {
+      if ((*mapSymbols)[i] == sym) {
+        parentExists = true;
+        parentIdx = i;
+      }
+    }
+
+    if (parentExists) {
+      // found a parent, append.
+      if (auto mapOp = mlir::dyn_cast<mlir::omp::MapInfoOp>(
+              mapOperands[parentIdx].getDefiningOp())) {
+        mapOp.getMembersMutable().append(memberMaps[idx]);
+        llvm::SmallVector<mlir::Attribute> memberIndexTmp{
+            mapOp.getMembersIndexAttr().begin(),
+            mapOp.getMembersIndexAttr().end()};
+        memberIndexTmp.push_back(memberPlacementIndices[idx]);
+        mapOp.setMembersIndexAttr(mlir::ArrayAttr::get(
+            converter.getFirOpBuilder().getContext(), memberIndexTmp));
+      }
+    } else {
+      // NOTE: We take the map type of the first child, this may not
+      // be the correct thing to do, however, we shall see. For the moment
+      // it allows this to work with enter and exit without causing MLIR
+      // verification issues. The more appropriate thing may be to take
+      // the "main" map type clause from the directive being used.
+      uint64_t mapType = 0;
+      if (auto mapOp = mlir::dyn_cast<mlir::omp::MapInfoOp>(
+              memberMaps[idx].getDefiningOp()))
+        mapType = mapOp.getMapType().value_or(0);
+
+      // create parent to emplace and bind members
+      auto origSymbol = converter.getSymbolAddress(*sym);
+      mlir::Value mapOp = createMapInfoOp(
+          converter.getFirOpBuilder(),
+          converter.getFirOpBuilder().getUnknownLoc(), origSymbol,
----------------
ergawy wrote:

I think we can provide more precise location info.
```suggestion
          origSymbol.getLoc(), origSymbol,
```
Might help with troubleshooting issues, I think.

https://github.com/llvm/llvm-project/pull/81511