Fixing the location attribute added to mapInfoOp (#90764)

Named location attribute added to `tgt_offload_entry` shall be used by
runtime calls like `ompx_dump_mapping_tables` to print the information
of variables that are mapped to the device. `ompx_dump_mapping_tables`
was printing the wrong location information and this change fixes it.

A sample execution of example before the change:
```
omptarget device 0 info: OpenMP Host-Device pointer mappings after block at libomptarget:0:0:

omptarget device 0 info: Host Ptr           Target Ptr         Size (B) DynRefCount HoldRefCount Declaration

omptarget device 0 info: 0x0000000000206df0 0x00007f02cdc00000 20000000 1           0            <program-file-loc> at unknown:18:35
```

The change replaces unknown to the mapped symbol and location to the
declaration location.

Author: anchuraj

flang/lib/Lower/OpenMP/ClauseProcessor.cpp

@@ -882,8 +882,11 @@ bool ClauseProcessor::processMap(
           // Explicit map captures are captured ByRef by default,
           // optimisation passes may alter this to ByCopy or other capture
           // types to optimise
+          auto location = mlir::NameLoc::get(
+              mlir::StringAttr::get(firOpBuilder.getContext(), asFortran.str()),
+              symAddr.getLoc());
           mlir::omp::MapInfoOp mapOp = createMapInfoOp(
-              firOpBuilder, clauseLocation, symAddr,
+              firOpBuilder, location, symAddr,
               /*varPtrPtr=*/mlir::Value{}, asFortran.str(), bounds,
               /*members=*/{}, /*membersIndex=*/mlir::DenseIntElementsAttr{},
               static_cast<

flang/lib/Lower/OpenMP/OpenMP.cpp

@@ -1604,9 +1604,12 @@ genTargetOp(lower::AbstractConverter &converter, lower::SymMap &symTable,
           mapFlag |= llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_TO;
           mapFlag |= llvm::omp::OpenMPOffloadMappingFlags::OMP_MAP_FROM;
         }
-
+        auto location =
+            mlir::NameLoc::get(mlir::StringAttr::get(firOpBuilder.getContext(),
+                                                     sym.name().ToString()),
+                               baseOp.getLoc());
         mlir::Value mapOp = createMapInfoOp(
-            firOpBuilder, baseOp.getLoc(), baseOp, /*varPtrPtr=*/mlir::Value{},
+            firOpBuilder, location, baseOp, /*varPtrPtr=*/mlir::Value{},
             name.str(), bounds, /*members=*/{},
             /*membersIndex=*/mlir::DenseIntElementsAttr{},
             static_cast<

offload/test/offloading/fortran/dump_map_tables.f90

@@ -0,0 +1,38 @@
+! Offloading test with runtine call to ompx_dump_mapping_tables
+! Fortran array writing some values and printing the variable mapped to device
+! correctly receives the updates made on the device.
+! REQUIRES: flang
+! UNSUPPORTED: nvptx64-nvidia-cuda-LTO
+! UNSUPPORTED: aarch64-unknown-linux-gnu
+! UNSUPPORTED: aarch64-unknown-linux-gnu-LTO
+! UNSUPPORTED: x86_64-pc-linux-gnu
+! UNSUPPORTED: x86_64-pc-linux-gnu-LTO
+
+! RUN: %libomptarget-compile-fortran-run-and-check-generic
+
+program map_dump_example
+  INTERFACE
+    SUBROUTINE ompx_dump_mapping_tables() BIND(C)
+    END SUBROUTINE ompx_dump_mapping_tables
+  END INTERFACE
+
+  integer i,j,k,N
+  integer async_q(4)
+  real :: A(5000000)
+  N=5000000
+  do i=1, N
+    A(i)=0
+  enddo
+! clang-format off
+! CHECK: omptarget device 0 info: OpenMP Host-Device pointer mappings after block
+! CHECK-NEXT: omptarget device 0 info: Host Ptr Target Ptr Size (B) DynRefCount HoldRefCount Declaration
+! CHECK-NEXT: omptarget device 0 info: {{(0x[0-9a-f]{16})}} {{(0x[0-9a-f]{16})}}  20000000 1 0 {{.*}} at a(:n):21:11
+! clang-format on
+!$omp target enter data map(to:A(:N))
+  call ompx_dump_mapping_tables()
+!$omp target parallel do
+  do i=1, N
+    A(i)=A(i)*2
+  enddo
+!$omp target exit data map(from:A)
+end program