[flang] Do not finalize pointer function result

[clementval]

Summary

According to 7.5.6.3 point 5, only nonpointer function result
need to be finalized. Update the condition to exclude pointer
function result.

[jeanPerier]

LGTM

[clementval]

Rebase

[clementval]

clang-format

flang/lib/Lower/ConvertCall.cpp

fir::ExtendedValue Fortran::lower::genCallOpAndResult(
   if (caller.mustSaveResult()) {
     assert(allocatedResult.has_value());
     builder.create<fir::SaveResultOp>(loc, callResult,
                                       fir::getBase(*allocatedResult),
                                       arrayResultShape, resultLengths);
   }
 
   if (allocatedResult) {
-    // 7.5.6.3 point 5. Derived-type finalization.
+    // 7.5.6.3 point 5. Derived-type finalization for nonpointer function.
     // Check if the derived-type is finalizable if it is a monorphic
     // derived-type.
     // For polymorphic and unlimited polymorphic enities call the runtime
     // in any cases.
     std::optional<Fortran::evaluate::DynamicType> retTy =
         caller.getCallDescription().proc().GetType();
-    if (retTy && (retTy->category() == Fortran::common::TypeCategory::Derived ||
+    if (!fir::isPointerType(funcType.getResults()[0]) && retTy && 
+        (retTy->category() == Fortran::common::TypeCategory::Derived ||
                   retTy->IsPolymorphic() || retTy->IsUnlimitedPolymorphic())) {
       if (retTy->IsPolymorphic() || retTy->IsUnlimitedPolymorphic()) {
         auto *bldr = &converter.getFirOpBuilder();
         stmtCtx.attachCleanup([bldr, loc, allocatedResult]() {
           fir::runtime::genDerivedTypeDestroy(*bldr, loc,
                                               fir::getBase(*allocatedResult));
         });
       } else {

flang/test/Lower/derived-type-finalization.f90

 
 ! CHECK-LABEL: func.func @_QMderived_type_finalizationPtest_finalize_intent_out(
 ! CHECK-SAME: %[[T:.*]]: !fir.ref<!fir.type<_QMderived_type_finalizationTt1{a:i32}>> {fir.bindc_name = "t"}) {
 ! CHECK: %[[EMBOX:.*]] = fir.embox %[[T]] : (!fir.ref<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>) -> !fir.box<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>
 ! CHECK: %[[BOX_NONE:.*]] = fir.convert %[[EMBOX]] : (!fir.box<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>) -> !fir.box<none>
 ! CHECK: %{{.*}} = fir.call @_FortranADestroy(%[[BOX_NONE]]) {{.*}}: (!fir.box<none>) -> none
 ! CHECK: return
 
+  function get_t1(i)
+    type(t1), pointer :: get_t1
+    allocate(get_t1)
+    get_t1%a = i
+  end function
+
+  subroutine test_nonpointer_function()
+    print*, get_t1(20)
+  end subroutine
+
+! CHECK-LABEL: func.func @_QMderived_type_finalizationPtest_nonpointer_function() {
+! CHECK: %[[TMP:.*]] = fir.alloca !fir.box<!fir.ptr<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>> {bindc_name = ".result"}
+! CHECK: %{{.*}} = fir.call @_FortranAioBeginExternalListOutput
+! CHECK: %[[RES:.*]] = fir.call @_QMderived_type_finalizationPget_t1(%{{.*}}) {{.*}} : (!fir.ref<i32>) -> !fir.box<!fir.ptr<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>>
+! CHECK: fir.save_result %[[RES]] to %[[TMP]] : !fir.box<!fir.ptr<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>>, !fir.ref<!fir.box<!fir.ptr<!fir.type<_QMderived_type_finalizationTt1{a:i32}>>>>
+! CHECK: %{{.*}} = fir.call @_FortranAioOutputDescriptor
+! CHECK-NOT: %{{.*}} = fir.call @_FortranADestroy
+! CHECK: %{{.*}} = fir.call @_FortranAioEndIoStatement
+! CHECK: return
+
 end module
 
 program p
   use derived_type_finalization
   type(t1) :: t
   if (t%a == 10) return
   print *, 'end of program'
 end program