Revert "[MLIR][OpenMP] Add a new AutomapToTargetData conversion pass in FIR (#153048)"

This reverts commit 4e6d510.

Author: TIFitis

flang/include/flang/Optimizer/OpenMP/Passes.td

@@ -112,15 +112,4 @@ def GenericLoopConversionPass
   ];
 }
 
-def AutomapToTargetDataPass
-    : Pass<"omp-automap-to-target-data", "::mlir::ModuleOp"> {
-  let summary = "Insert OpenMP target data operations for AUTOMAP variables";
-  let description = [{
-    Inserts `omp.target_enter_data` and `omp.target_exit_data` operations to
-    map variables marked with the `AUTOMAP` modifier when their allocation
-    or deallocation is detected in the FIR.
-  }];
-  let dependentDialects = ["mlir::omp::OpenMPDialect"];
-}
-
 #endif //FORTRAN_OPTIMIZER_OPENMP_PASSES

flang/include/flang/Support/OpenMP-utils.h

@@ -9,13 +9,8 @@
 #ifndef FORTRAN_SUPPORT_OPENMP_UTILS_H_
 #define FORTRAN_SUPPORT_OPENMP_UTILS_H_
 
-#include "flang/Optimizer/Builder/DirectivesCommon.h"
-#include "flang/Optimizer/Builder/FIRBuilder.h"
-#include "flang/Optimizer/Builder/HLFIRTools.h"
-#include "flang/Optimizer/Dialect/FIRType.h"
 #include "flang/Semantics/symbol.h"
 
-#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
 #include "mlir/IR/Builders.h"
 #include "mlir/IR/Value.h"
 
@@ -77,35 +72,6 @@ struct EntryBlockArgs {
 /// \param [in]  region - Empty region in which to create the entry block.
 mlir::Block *genEntryBlock(
     mlir::OpBuilder &builder, const EntryBlockArgs &args, mlir::Region &region);
-
-// Returns true if the variable has a dynamic size and therefore requires
-// bounds operations to describe its extents.
-inline bool needsBoundsOps(mlir::Value var) {
-  assert(mlir::isa<mlir::omp::PointerLikeType>(var.getType()) &&
-      "only pointer like types expected");
-  mlir::Type t = fir::unwrapRefType(var.getType());
-  if (mlir::Type inner = fir::dyn_cast_ptrOrBoxEleTy(t))
-    return fir::hasDynamicSize(inner);
-  return fir::hasDynamicSize(t);
-}
-
-// Generate MapBoundsOp operations for the variable if required.
-inline void genBoundsOps(fir::FirOpBuilder &builder, mlir::Value var,
-    llvm::SmallVectorImpl<mlir::Value> &boundsOps) {
-  mlir::Location loc = var.getLoc();
-  fir::factory::AddrAndBoundsInfo info =
-      fir::factory::getDataOperandBaseAddr(builder, var,
-          /*isOptional=*/false, loc);
-  fir::ExtendedValue exv =
-      hlfir::translateToExtendedValue(loc, builder, hlfir::Entity{info.addr},
-          /*contiguousHint=*/true)
-          .first;
-  llvm::SmallVector<mlir::Value> tmp =
-      fir::factory::genImplicitBoundsOps<mlir::omp::MapBoundsOp,
-          mlir::omp::MapBoundsType>(
-          builder, info, exv, /*dataExvIsAssumedSize=*/false, loc);
-  llvm::append_range(boundsOps, tmp);
-}
 } // namespace Fortran::common::openmp
 
 #endif // FORTRAN_SUPPORT_OPENMP_UTILS_H_

flang/lib/Optimizer/OpenMP/AutomapToTargetData.cpp

@@ -1,7 +1,6 @@
 get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
 
 add_flang_library(FlangOpenMPTransforms
-  AutomapToTargetData.cpp
   DoConcurrentConversion.cpp
   FunctionFiltering.cpp
   GenericLoopConversion.cpp

flang/lib/Optimizer/OpenMP/CMakeLists.txt

@@ -29,7 +29,6 @@
 #include "flang/Optimizer/Dialect/Support/KindMapping.h"
 #include "flang/Optimizer/HLFIR/HLFIROps.h"
 #include "flang/Optimizer/OpenMP/Passes.h"
-#include "flang/Support/OpenMP-utils.h"
 
 #include "mlir/Dialect/Func/IR/FuncOps.h"
 #include "mlir/Dialect/OpenMP/OpenMPDialect.h"
@@ -48,7 +47,6 @@ namespace flangomp {
 } // namespace flangomp
 
 using namespace mlir;
-using namespace Fortran::common::openmp;
 
 namespace {
 class MapsForPrivatizedSymbolsPass
@@ -195,5 +193,38 @@ class MapsForPrivatizedSymbolsPass
       }
     }
   }
+  // As the name suggests, this function examines var to determine if
+  // it has dynamic size. If true, this pass'll have to extract these
+  // bounds from descriptor of var and add the bounds to the resultant
+  // MapInfoOp.
+  bool needsBoundsOps(mlir::Value var) {
+    assert(mlir::isa<omp::PointerLikeType>(var.getType()) &&
+           "needsBoundsOps can deal only with pointer types");
+    mlir::Type t = fir::unwrapRefType(var.getType());
+    // t could be a box, so look inside the box
+    auto innerType = fir::dyn_cast_ptrOrBoxEleTy(t);
+    if (innerType)
+      return fir::hasDynamicSize(innerType);
+    return fir::hasDynamicSize(t);
+  }
+
+  void genBoundsOps(fir::FirOpBuilder &builder, mlir::Value var,
+                    llvm::SmallVector<mlir::Value> &boundsOps) {
+    mlir::Location loc = var.getLoc();
+    fir::factory::AddrAndBoundsInfo info =
+        fir::factory::getDataOperandBaseAddr(builder, var,
+                                             /*isOptional=*/false, loc);
+    fir::ExtendedValue extendedValue =
+        hlfir::translateToExtendedValue(loc, builder, hlfir::Entity{info.addr},
+                                        /*continguousHint=*/true)
+            .first;
+    llvm::SmallVector<mlir::Value> boundsOpsVec =
+        fir::factory::genImplicitBoundsOps<mlir::omp::MapBoundsOp,
+                                           mlir::omp::MapBoundsType>(
+            builder, info, extendedValue,
+            /*dataExvIsAssumedSize=*/false, loc);
+    for (auto bounds : boundsOpsVec)
+      boundsOps.push_back(bounds);
+  }
 };
 } // namespace

flang/lib/Optimizer/OpenMP/MapsForPrivatizedSymbols.cpp

@@ -316,13 +316,13 @@ void createOpenMPFIRPassPipeline(mlir::PassManager &pm,
     pm.addPass(flangomp::createDoConcurrentConversionPass(
         opts.doConcurrentMappingKind == DoConcurrentMappingKind::DCMK_Device));
 
-  // The MapsForPrivatizedSymbols and AutomapToTargetDataPass pass need to run
-  // before MapInfoFinalizationPass because they create new MapInfoOp
-  // instances, typically for descriptors. MapInfoFinalizationPass adds
-  // MapInfoOp instances for the descriptors underlying data which is necessary
-  // to access the data on the offload target device.
+  // The MapsForPrivatizedSymbols pass needs to run before
+  // MapInfoFinalizationPass because the former creates new
+  // MapInfoOp instances, typically for descriptors.
+  // MapInfoFinalizationPass adds MapInfoOp instances for the descriptors
+  // underlying data which is necessary to access the data on the offload
+  // target device.
   pm.addPass(flangomp::createMapsForPrivatizedSymbolsPass());
-  pm.addPass(flangomp::createAutomapToTargetDataPass());
   pm.addPass(flangomp::createMapInfoFinalizationPass());
   pm.addPass(flangomp::createMarkDeclareTargetPass());
   pm.addPass(flangomp::createGenericLoopConversionPass());