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[flang] Use the namelist item descriptor if it is local polymorphic entity. #162701

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[flang] Use the namelist item descriptor if it is local polymorphic entity. #162701

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edd7680
Use the namelist item descriptor if it is local polymorphic entity.
DanielCChen Oct 9, 2025
a175437
To address review comments.
DanielCChen Oct 10, 2025
4452e14
Update the test case.
DanielCChen Oct 10, 2025
fc8d5cc
To set fir::ClassType for the temporary descriptor.
DanielCChen Oct 11, 2025
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10 changes: 8 additions & 2 deletions flang/lib/Lower/IO.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -524,12 +524,18 @@ getNamelistGroup(Fortran::lower::AbstractConverter &converter,
descAddr =
builder.createConvert(loc, builder.getRefType(symType), varAddr);
} else {
fir::BaseBoxType boxType;
const auto expr = Fortran::evaluate::AsGenericExpr(s);
fir::ExtendedValue exv = converter.genExprAddr(*expr, stmtCtx);
mlir::Type type = fir::getBase(exv).getType();
mlir::Type eleType = type;
if (mlir::Type baseTy = fir::dyn_cast_ptrOrBoxEleTy(type))
type = baseTy;
fir::BoxType boxType = fir::BoxType::get(fir::PointerType::get(type));
eleType = baseTy;

if (mlir::isa<fir::ClassType>(type))
boxType = fir::ClassType::get(fir::PointerType::get(eleType));
else
boxType = fir::BoxType::get(fir::PointerType::get(eleType));
descAddr = builder.createTemporary(loc, boxType);
fir::MutableBoxValue box = fir::MutableBoxValue(descAddr, {}, {});
fir::factory::associateMutableBox(builder, loc, box, exv,
Expand Down
40 changes: 40 additions & 0 deletions flang/test/Lower/namelist.f90
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Expand Up @@ -123,6 +123,45 @@ subroutine global_pointer
write(10, nml=mygroup)
end

module m
type base
real :: r1
end type
interface write(formatted)
subroutine writeformatted(dtv, unit, iotype, v_list, iostat, iomsg )
import base
class(base), intent(in) :: dtv
integer, intent(in) :: unit
character(*), intent(in) :: iotype
integer, intent(in) :: v_list(:)
integer, intent(out) :: iostat
character(*), intent(inout) :: iomsg
end subroutine
end interface
end module

! CHECK-LABEL: c.func @_QPlocal_poly_namelist
subroutine local_poly_namelist
use m
class(base), allocatable :: b1
! CHECK: %[[V_0:[0-9]+]] = fir.alloca !fir.class<!fir.ptr<!fir.type<_QMmTbase{r1:f32}>>>
! CHECK: %[[V_2:[0-9]+]] = fir.alloca !fir.class<!fir.heap<!fir.type<_QMmTbase{r1:f32}>>> {bindc_name = "b1", uniq_name = "_QFlocal_poly_namelistEb1"}
! CHECK: %[[V_5:[0-9]+]] = fir.declare %[[V_2]] {fortran_attrs = #fir.var_attrs<allocatable>, uniq_name = "_QFlocal_poly_namelistEb1"} : (!fir.ref<!fir.class<!fir.heap<!fir.type<_QMmTbase{r1:f32}>>>>) -> !fir.ref<!fir.class<!fir.heap<!fir.type<_QMmTbase{r1:f32}>>>>
! CHECK: %[[V_9:[0-9]+]] = fir.alloca !fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>
! CHECK: %[[V_10:[0-9]+]] = fir.undefined !fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>
! CHECK: %[[V_11:[0-9]+]] = fir.address_of(@_QQclX623100) : !fir.ref<!fir.char<1,3>>
! CHECK: %[[V_12:[0-9]+]] = fir.convert %[[V_11]] : (!fir.ref<!fir.char<1,3>>) -> !fir.ref<i8>
! CHECK: %[[V_13:[0-9]+]] = fir.insert_value %[[V_10]], %[[V_12]], [0 : index, 0 : index] : (!fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>, !fir.ref<i8>) -> !fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>
! CHECK: %[[V_14:[0-9]+]] = fir.load %[[V_5]] : !fir.ref<!fir.class<!fir.heap<!fir.type<_QMmTbase{r1:f32}>>>>
! CHECK: %[[V_15:[0-9]+]] = fir.rebox %[[V_14]] : (!fir.class<!fir.heap<!fir.type<_QMmTbase{r1:f32}>>>) -> !fir.class<!fir.ptr<!fir.type<_QMmTbase{r1:f32}>>>
! CHECK: fir.store %[[V_15]] to %[[V_0]] : !fir.ref<!fir.class<!fir.ptr<!fir.type<_QMmTbase{r1:f32}>>>>
! CHECK: %[[V_16:[0-9]+]] = fir.convert %[[V_0]] : (!fir.ref<!fir.class<!fir.ptr<!fir.type<_QMmTbase{r1:f32}>>>>) -> !fir.ref<!fir.box<none>>
! CHECK: %[[V_17:[0-9]+]] = fir.insert_value %[[V_13]], %[[V_16]], [0 : index, 1 : index] : (!fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>, !fir.ref<!fir.box<none>>) -> !fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>
! CHECK: fir.store %[[V_17]] to %[[V_9]] : !fir.ref<!fir.array<1xtuple<!fir.ref<i8>, !fir.ref<!fir.box<none>>>>>
namelist/mygroup/b1
write(10, nml=mygroup)
end subroutine

module mmm
real rrr
namelist /aaa/ rrr
Expand All @@ -142,3 +181,4 @@ subroutine rename_sub

! CHECK-NOT: ggg
! CHECK: fir.string_lit "aaa\00"(4) : !fir.char<1,4>