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merged 4 commits into from
Dec 5, 2024
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[flang] fix private pointers and default initialized variables #118494

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92c2860
[flang] fix private pointers and default initialized variables
jeanPerier Dec 3, 2024
cb3e976
remove unsued variable in fortran test
jeanPerier Dec 3, 2024
567883d
do not default initialize OMP variables twice
jeanPerier Dec 4, 2024
c745a1f
Update flang/lib/Lower/Bridge.cpp
jeanPerier Dec 4, 2024
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34 changes: 29 additions & 5 deletions flang/lib/Lower/Bridge.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -768,13 +768,21 @@ class FirConverter : public Fortran::lower::AbstractConverter {
// Initialise cloned allocatable
hexv.match(
[&](const fir::MutableBoxValue &box) -> void {
// Do not process pointers
const auto new_box = exv.getBoxOf<fir::MutableBoxValue>();
if (Fortran::semantics::IsPointer(sym.GetUltimate())) {
// Establish the pointer descriptors. The rank and type code/size
// at least must be set properly for later inquiry of the pointer
// to work, and new pointers are always given diassociated status
// by flang for safety, even if this is not required by the
// language.
auto empty = fir::factory::createUnallocatedBox(
*builder, loc, new_box->getBoxTy(), box.nonDeferredLenParams(),
{});
builder->create<fir::StoreOp>(loc, empty, new_box->getAddr());
return;
}
// Allocate storage for a pointer/allocatble descriptor.
// No shape/lengths to be passed to the alloca.
const auto new_box = exv.getBoxOf<fir::MutableBoxValue>();
// Copy allocation status of Allocatables, creating new storage if
// needed.

// allocate if allocated
mlir::Value isAllocated =
Expand Down Expand Up @@ -822,7 +830,20 @@ class FirConverter : public Fortran::lower::AbstractConverter {
if_builder.end();
},
[&](const auto &) -> void {
// Do nothing
// Initialize local/private derived types with default
// initialization (Fortran 2023 section 11.1.7.5 and OpenMP 5.2
// section 5.3). Pointer and allocatable components, when allowed,
// also need to be established so that flang runtime can later work
// with them.
if (const Fortran::semantics::DeclTypeSpec *declTypeSpec =
sym.GetType())
if (const Fortran::semantics::DerivedTypeSpec *derivedTypeSpec =
declTypeSpec->AsDerived())
if (derivedTypeSpec->HasDefaultInitialization(
/*ignoreAllocatable=*/false, /*ignorePointer=*/false)) {
mlir::Value box = builder->createBox(loc, exv);
fir::runtime::genDerivedTypeInitialize(*builder, loc, box);
}
Comment on lines +844 to +848
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@luporl luporl Dec 3, 2024

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DataSharingProcessor::cloneSymbol does something similar for privatizations, except for firstprivate:

  if (!isFirstPrivate &&
      Fortran::lower::hasDefaultInitialization(sym->GetUltimate()))
    Fortran::lower::defaultInitializeAtRuntime(converter, *sym, *symTable);

Won't this make Initialize be called twice for private clauses?

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@jeanPerier jeanPerier Dec 4, 2024

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Indeed, thanks for catching this! I removed the init from hasDefaultInitialization and added a flag to the createHostAssociateVarClone to disable the init in the firstprivate case (and the doc concurrent local_init).

});

return bindIfNewSymbol(sym, exv);
Expand Down Expand Up @@ -1985,6 +2006,9 @@ class FirConverter : public Fortran::lower::AbstractConverter {
sym->detailsIf<Fortran::semantics::HostAssocDetails>();
copySymbolBinding(hostDetails->symbol(), *sym);
}
// Note that allocatable, types with ultimate components, and type
// requiring finalization are forbidden in LOCAL/LOCAL_INIT (F2023 C1130),
// so no clean-up needs to be generated for these entities.
}

/// Generate FIR for a DO construct. There are six variants:
Expand Down
27 changes: 27 additions & 0 deletions flang/test/Lower/OpenMP/delayed-privatization-default-init.f90
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@@ -0,0 +1,27 @@
! Test delayed privatization for derived types with default initialization.

! RUN: %flang_fc1 -emit-hlfir -fopenmp -mmlir --openmp-enable-delayed-privatization \
! RUN: -o - %s 2>&1 | FileCheck %s
! RUN: bbc -emit-hlfir -fopenmp --openmp-enable-delayed-privatization -o - %s 2>&1 |\
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@eugeneepshteyn eugeneepshteyn Dec 3, 2024

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For my education, what does bbc tool do?

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@Leporacanthicus Leporacanthicus Dec 3, 2024

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bbc is an alternative frontend of the compiler, which generates the FIR (or HLFIR in this case) level. There is a tco second part that runs optimisation passes and generated LLVM-IR (or lowered MLIR).

The main point of having both here is to check that the option for delayed privatization works for both variants. Almost all code is shared, but command-line parsing is not identical. [We should, as a general case, avoid running everything in both bbc and flang, if there's no clear reason why code takes a different path through the two tools].

! RUN: FileCheck %s

subroutine delayed_privatization_default_init
implicit none
type t
integer :: i = 2
end type
integer :: i, res(4)
type(t) :: a
!$omp parallel firstprivate(a)
call do_something(a%i)
!$omp end parallel
end subroutine
! CHECK-LABEL: omp.private {type = firstprivate} @_QFdelayed_privatization_default_initEa_firstprivate_ref_rec__QFdelayed_privatization_default_initTt : !fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>> alloc {
! CHECK: ^bb0(%[[VAL_0:.*]]: !fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>):
! CHECK: %[[VAL_1:.*]] = fir.alloca !fir.type<_QFdelayed_privatization_default_initTt{i:i32}> {bindc_name = "a", pinned, uniq_name = "_QFdelayed_privatization_default_initEa"}
! CHECK: %[[VAL_2:.*]] = fir.embox %[[VAL_1]] : (!fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>) -> !fir.box<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>
! CHECK: %[[VAL_6:.*]] = fir.convert %[[VAL_2]] : (!fir.box<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>) -> !fir.box<none>
! CHECK: %[[VAL_8:.*]] = fir.call @_FortranAInitialize(%[[VAL_6]],{{.*}}
! CHECK: %[[VAL_9:.*]]:2 = hlfir.declare %[[VAL_1]] {uniq_name = "_QFdelayed_privatization_default_initEa"} : (!fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>) -> (!fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>, !fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>)
! CHECK: omp.yield(%[[VAL_9]]#0 : !fir.ref<!fir.type<_QFdelayed_privatization_default_initTt{i:i32}>>)
! CHECK: }
3 changes: 3 additions & 0 deletions flang/test/Lower/OpenMP/delayed-privatization-pointer.f90
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Expand Up @@ -20,6 +20,9 @@ subroutine delayed_privatization_pointer
! CHECK-NEXT: ^bb0(%[[PRIV_ARG:.*]]: [[TYPE]]):

! CHECK-NEXT: %[[PRIV_ALLOC:.*]] = fir.alloca !fir.box<!fir.ptr<i32>> {bindc_name = "var1", pinned, uniq_name = "_QFdelayed_privatization_pointerEvar1"}
! CHECK-NEXT: %[[NULL:.*]] = fir.zero_bits !fir.ptr<i32>
! CHECK-NEXT: %[[INIT:.*]] = fir.embox %[[NULL]] : (!fir.ptr<i32>) -> !fir.box<!fir.ptr<i32>>
! CHECK-NEXT: fir.store %[[INIT]] to %[[PRIV_ALLOC]] : !fir.ref<!fir.box<!fir.ptr<i32>>>
! CHECK-NEXT: %[[PRIV_DECL:.*]]:2 = hlfir.declare %[[PRIV_ALLOC]]
! CHECK-NEXT: omp.yield(%[[PRIV_DECL]]#0 : [[TYPE]])

Expand Down
52 changes: 52 additions & 0 deletions flang/test/Lower/do_concurrent_local_default_init.f90
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@@ -0,0 +1,52 @@
! Test default initialization of DO CONCURRENT LOCAL() entities.
! RUN: bbc -emit-hlfir -I nowhere -o - %s | FileCheck %s

subroutine test_ptr(p)
interface
pure subroutine takes_ptr(p)
character(*), intent(in), pointer :: p(:)
end subroutine
end interface
character(*), pointer :: p(:)
integer :: i
do concurrent (i=1:10) local(p)
call takes_ptr(p)
end do
end subroutine

subroutine test_default_init()
type t
integer :: i = 2
end type
integer :: i, res(4)
type(t) :: a
do concurrent (i=1:4) local(a)
res = a%i
end do
call something(res)
end subroutine
! CHECK-LABEL: func.func @_QPtest_ptr(
! CHECK-SAME: %[[VAL_0:.*]]: !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>> {fir.bindc_name = "p"}) {
! CHECK: %[[VAL_6:.*]] = fir.load %[[VAL_0]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>>
! CHECK: %[[VAL_7:.*]] = fir.box_elesize %[[VAL_6]] : (!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>) -> index
! CHECK: fir.do_loop
! CHECK: %[[VAL_16:.*]] = fir.alloca !fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>> {bindc_name = "p", pinned, uniq_name = "_QFtest_ptrEp"}
! CHECK: %[[VAL_17:.*]] = fir.zero_bits !fir.ptr<!fir.array<?x!fir.char<1,?>>>
! CHECK: %[[VAL_18:.*]] = arith.constant 0 : index
! CHECK: %[[VAL_19:.*]] = fir.shape %[[VAL_18]] : (index) -> !fir.shape<1>
! CHECK: %[[VAL_20:.*]] = fir.embox %[[VAL_17]](%[[VAL_19]]) typeparams %[[VAL_7]] : (!fir.ptr<!fir.array<?x!fir.char<1,?>>>, !fir.shape<1>, index) -> !fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>
! CHECK: fir.store %[[VAL_20]] to %[[VAL_16]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>>
! CHECK: %[[VAL_21:.*]]:2 = hlfir.declare %[[VAL_16]] {fortran_attrs = #fir.var_attrs<pointer>, uniq_name = "_QFtest_ptrEp"} : (!fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>>) -> (!fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>>, !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>>)
! CHECK: fir.call @_QPtakes_ptr(%[[VAL_21]]#0) proc_attrs<pure> fastmath<contract> : (!fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.char<1,?>>>>>) -> ()
! CHECK: }
! CHECK: return
! CHECK: }

! CHECK-LABEL: func.func @_QPtest_default_init(
! CHECK: fir.do_loop
! CHECK: %[[VAL_26:.*]] = fir.alloca !fir.type<_QFtest_default_initTt{i:i32}> {bindc_name = "a", pinned, uniq_name = "_QFtest_default_initEa"}
! CHECK: %[[VAL_27:.*]] = fir.embox %[[VAL_26]] : (!fir.ref<!fir.type<_QFtest_default_initTt{i:i32}>>) -> !fir.box<!fir.type<_QFtest_default_initTt{i:i32}>>
! CHECK: %[[VAL_30:.*]] = fir.convert %[[VAL_27]] : (!fir.box<!fir.type<_QFtest_default_initTt{i:i32}>>) -> !fir.box<none>
! CHECK: %[[VAL_32:.*]] = fir.call @_FortranAInitialize(%[[VAL_30]], {{.*}}
! CHECK: %[[VAL_33:.*]]:2 = hlfir.declare %[[VAL_26]] {uniq_name = "_QFtest_default_initEa"} : (!fir.ref<!fir.type<_QFtest_default_initTt{i:i32}>>) -> (!fir.ref<!fir.type<_QFtest_default_initTt{i:i32}>>, !fir.ref<!fir.type<_QFtest_default_initTt{i:i32}>>)
! CHECK: }
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