[flang][OpenMP] Skip default privatization for crashing cases (#71922)

This patch skips default privatization for crashing cases like
namelists, reduction instrinsics, and structure constructor.

Fixes: #67332,
#66454, and
#65569

Co-Authored-By: kiranchandramohan <kiran.chandramohan@arm.com>

Author: NimishMishra

flang/lib/Lower/OpenMP.cpp

@@ -481,7 +481,10 @@ void DataSharingProcessor::copyLastPrivatize(mlir::Operation *op) {
 
 void DataSharingProcessor::defaultPrivatize() {
   for (const Fortran::semantics::Symbol *sym : defaultSymbols) {
-    if (!symbolsInNestedRegions.contains(sym) &&
+    if (!Fortran::semantics::IsProcedure(*sym) &&
+        !sym->GetUltimate().has<Fortran::semantics::DerivedTypeDetails>() &&
+        !sym->GetUltimate().has<Fortran::semantics::NamelistDetails>() &&
+        !symbolsInNestedRegions.contains(sym) &&
         !symbolsInParentRegions.contains(sym) &&
         !privatizedSymbols.contains(sym)) {
       cloneSymbol(sym);

flang/test/Lower/OpenMP/default-clause.f90

@@ -318,10 +318,68 @@ subroutine nested_default_clause_tests
 !CHECK: }
 !CHECK: omp.terminator
 !CHECK: }
+!CHECK: return
 !CHECK: } 
 	!$omp parallel default(firstprivate)
 		!$omp single
 			x = y
 		!$omp end single
 	!$omp end parallel
 end subroutine
+
+!CHECK: func.func @_QPskipped_default_clause_checks() {
+!CHECK: %[[TYPE_ADDR:.*]] = fir.address_of(@_QFskipped_default_clause_checksE.n.i1) : !fir.ref<!fir.char<1,2>>
+!CHECK: %[[VAL_CONST_2:.*]] = arith.constant 2 : index
+!CHECK: %[[VAL_I1_DECLARE:.*]]:2 = hlfir.declare %[[TYPE_ADDR]] typeparams %[[VAL_CONST_2]] {{.*}}
+!CHECK: %[[TYPE_ADDR_IT:.*]] = fir.address_of(@_QFskipped_default_clause_checksE.n.it) : !fir.ref<!fir.char<1,2>>
+!CHECK: %[[VAL_CONST_2_0:.*]] = arith.constant 2 : index
+!CHECK: %[[VAL_IT_DECLARE:.*]]:2 = hlfir.declare %[[TYPE_ADDR_IT]] typeparams %[[VAL_CONST_2_0]] {{.*}}
+!CHECK: %[[VAL_I_ALLOCA:.*]] = fir.alloca i32 {bindc_name = "i", uniq_name = "_QFskipped_default_clause_checksEi"}
+!CHECK: %[[VAL_I_DECLARE:.*]]:2 = hlfir.declare %[[VAL_I_ALLOCA]] {{.*}}
+!CHECK: %[[VAL_III_ALLOCA:.*]] = fir.alloca !fir.type<_QFskipped_default_clause_checksTit{i1:i32}> {bindc_name = "iii", uniq_name = "_QFskipped_default_clause_checksEiii"}
+!CHECK: %[[VAL_III_DECLARE:.*]]:2 = hlfir.declare %[[VAL_III_ALLOCA]] {{.*}}
+!CHECK: %[[VAL_X_ALLOCA:.*]] = fir.alloca i32 {bindc_name = "x", uniq_name = "_QFskipped_default_clause_checksEx"}
+!CHECK: %[[VAL_X_DECLARE:.*]]:2 = hlfir.declare %[[VAL_X_ALLOCA]] {{.*}}
+!CHECK: %[[VAL_Y_ALLOCA:.*]] = fir.alloca i32 {bindc_name = "y", uniq_name = "_QFskipped_default_clause_checksEy"}
+!CHECK: %[[VAL_Y_DECLARE:.*]]:2 = hlfir.declare %[[VAL_Y_ALLOCA]] {{.*}}
+!CHECK: %[[VAL_Z_ALLOCA:.*]] = fir.alloca i32 {bindc_name = "z", uniq_name = "_QFskipped_default_clause_checksEz"}
+!CHECK: %[[VAL_Z_DECLARE:.*]]:2 = hlfir.declare %[[VAL_Z_ALLOCA]] {{.*}}
+subroutine skipped_default_clause_checks()
+       integer :: x,y,z
+       type it
+         integer::i1
+       end type
+       type(it)::iii
+
+!CHECK: omp.parallel {
+!CHECK: omp.wsloop reduction(@min_i_32 -> %[[VAL_Z_DECLARE]]#0 : !fir.ref<i32>) for (%[[ARG:.*]]) {{.*}} {
+!CHECK: omp.yield
+!CHECK: }
+!CHECK: omp.terminator
+!CHECK: }
+       !$omp parallel do default(private) REDUCTION(MIN:z)
+         do i = 1, 10
+           x = x + MIN(y,x)
+         enddo
+       !$omp end parallel do
+
+!CHECK: omp.parallel {
+!CHECK: omp.terminator
+!CHECK: }
+       namelist /nam/i
+       !$omp parallel default(private)
+          write(1,nam )
+       !$omp endparallel
+
+!CHECK: omp.parallel {
+!CHECK: %[[PRIVATE_III_ALLOCA:.*]] = fir.alloca !fir.type<_QFskipped_default_clause_checksTit{i1:i32}> {{.*}}
+!CHECK: %[[PRIVATE_III_DECLARE:.*]]:2 = hlfir.declare %[[PRIVATE_III_ALLOCA]] {{.*}}
+!CHECK: %[[PRIVATE_ADDR:.*]] = fir.address_of(@_QQro._QFskipped_default_clause_checksTit.0) : !fir.ref<!fir.type<_QFskipped_default_clause_checksTit{i1:i32}>>
+!CHECK: %[[PRIVATE_PARAM:.*]]:2 = hlfir.declare %[[PRIVATE_ADDR]] {{.*}}
+!CHECK: hlfir.assign %[[PRIVATE_PARAM]]#0 to %[[PRIVATE_III_DECLARE]]#0 {{.*}}
+!CHECK: omp.terminator
+!CHECK: }
+       !$omp parallel default(private)
+          iii=it(11)
+       !$omp end parallel
+end subroutine