[Mlir-commits] [mlir] [OpenMP][Flang] Add "IsolatedFromAbove" trait to omp.target (PR #67164)

[llvmlistbot at llvm.org]

================
@@ -2463,10 +2559,111 @@ genTargetOp(Fortran::lower::AbstractConverter &converter,
                  Fortran::parser::OmpClause::Defaultmap>(
       currentLocation, llvm::omp::Directive::OMPD_target);
 
-  return genOpWithBody<mlir::omp::TargetOp>(
-      converter, eval, currentLocation, outerCombined, &clauseList,
-      ifClauseOperand, deviceOperand, threadLimitOperand, nowaitAttr,
-      mapOperands);
+  auto captureImplicitMap = [&](const Fortran::semantics::Symbol &sym) {
+    if (llvm::find(mapSymbols, &sym) == mapSymbols.end()) {
+      mlir::Value baseOp = converter.getSymbolAddress(sym);
+      if (!baseOp)
+        if (const auto *details = sym.template detailsIf<
+                                  Fortran::semantics::HostAssocDetails>()) {
+          baseOp = converter.getSymbolAddress(details->symbol());
+          converter.copySymbolBinding(details->symbol(), sym);
+        }
+
+      if (baseOp) {
+        llvm::SmallVector<mlir::Value> bounds;
+        std::stringstream name;
+        fir::ExtendedValue dataExv = converter.getSymbolExtendedValue(sym);
+        name << sym.name().ToString();
+
+        mlir::Value baseAddr =
+            getDataOperandBaseAddr(converter, converter.getFirOpBuilder(), sym,
+                                   converter.getCurrentLocation());
+        if (fir::unwrapRefType(baseAddr.getType()).isa<fir::BaseBoxType>())
+          bounds =
+              Fortran::lower::genBoundsOpsFromBox<mlir::omp::DataBoundsOp,
+                                                  mlir::omp::DataBoundsType>(
+                  converter.getFirOpBuilder(), converter.getCurrentLocation(),
+                  converter, dataExv, baseAddr);
+        if (fir::unwrapRefType(baseAddr.getType()).isa<fir::SequenceType>())
+          bounds = Fortran::lower::genBaseBoundsOps<mlir::omp::DataBoundsOp,
+                                                    mlir::omp::DataBoundsType>(
+              converter.getFirOpBuilder(), converter.getCurrentLocation(),
+              converter, dataExv, baseAddr);
+
+        llvm::omp::OpenMPOffloadMappingFlags mapFlag =
+            llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_IMPLICIT;
+        if (auto refType = baseOp.getType().dyn_cast<fir::ReferenceType>()) {
+          auto eleType = refType.getElementType();
+          if (fir::isa_trivial(eleType) || fir::isa_char(eleType)) {
+            mapFlag |= llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_LITERAL;
+          } else if (fir::isa_box_type(eleType)) {
+            mapFlag |= llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_TO;
+            mapFlag |= llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_FROM;
+          }
+        }
+
+        mlir::Value mapOp = createMapInfoOp(
+            converter.getFirOpBuilder(), baseOp.getLoc(), baseOp, name, bounds,
+            static_cast<
+                std::underlying_type_t<llvm::omp::OpenMPOffloadMappingFlags>>(
+                mapFlag),
+            mlir::omp::VariableCaptureKind::ByCopy, baseOp.getType());
----------------
agozillon wrote:

Could we also change this to ByRef if the captured variable doesn't fall into the `if (fir::isa_trivial(eleType) || fir::isa_char(eleType))` case? i.e. ByCopy when it's a scalar/FirstPrivateable and ByRef when it's not similar to how Clang's lowering currently does it, I've found that this does allow more mapping cases to work. 

https://github.com/llvm/llvm-project/pull/67164