flang/test/Lower/HLFIR/null.f90

   1 ! Test lowering of NULL(MOLD) to HLFIR.
   2 ! RUN: bbc -emit-hlfir -o - %s | FileCheck %s
   3 subroutine test1(mold)
   4   integer, pointer :: mold(:)
   5   interface
   6     subroutine takes_ptr(p)
   7       integer, pointer :: p(:)
   8     end subroutine
   9   end interface
  10   call takes_ptr(null(mold))
  11 end subroutine
  12 ! CHECK-LABEL:   func.func @_QPtest1(
  13 ! CHECK:  %[[VAL_1:.*]] = fir.alloca !fir.box<!fir.ptr<!fir.array<?xi32>>>
  14 ! CHECK:  %[[VAL_3:.*]] = fir.zero_bits !fir.ptr<!fir.array<?xi32>>
  15 ! CHECK:  %[[VAL_4:.*]] = arith.constant 0 : index
  16 ! CHECK:  %[[VAL_5:.*]] = fir.shape %[[VAL_4]] : (index) -> !fir.shape<1>
  17 ! CHECK:  %[[VAL_6:.*]] = fir.embox %[[VAL_3]](%[[VAL_5]]) : (!fir.ptr<!fir.array<?xi32>>, !fir.shape<1>) -> !fir.box<!fir.ptr<!fir.array<?xi32>>>
  18 ! CHECK:  fir.store %[[VAL_6]] to %[[VAL_1]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>
  19 ! CHECK:  %[[VAL_7:.*]]:2 = hlfir.declare %[[VAL_1]] {uniq_name = ".tmp.intrinsic_result"} : (!fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>) -> (!fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>, !fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>)
  20 ! CHECK:  fir.call @_QPtakes_ptr(%[[VAL_7]]#0) fastmath<contract> : (!fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>) -> ()
  21
  22 subroutine test2
  23   integer, pointer :: i
  24   logical :: l
  25   l = associated(null(),i)
  26 end subroutine test2
  27 ! CHECK-LABEL:   func.func @_QPtest2() {
  28 ! CHECK:           %[[VAL_0:.*]] = fir.alloca !fir.box<!fir.ptr<none>>
  29 ! CHECK:           %[[VAL_1:.*]] = fir.alloca !fir.box<!fir.ptr<i32>> {bindc_name = "i", uniq_name = "_QFtest2Ei"}
  30 ! CHECK:           %[[VAL_2:.*]] = fir.zero_bits !fir.ptr<i32>
  31 ! CHECK:           %[[VAL_3:.*]] = fir.embox %[[VAL_2]] : (!fir.ptr<i32>) -> !fir.box<!fir.ptr<i32>>
  32 ! CHECK:           fir.store %[[VAL_3]] to %[[VAL_1]] : !fir.ref<!fir.box<!fir.ptr<i32>>>
  33 ! CHECK:           %[[VAL_4:.*]]:2 = hlfir.declare %[[VAL_1]] {fortran_attrs = #fir.var_attrs<pointer>, uniq_name = "_QFtest2Ei"} : (!fir.ref<!fir.box<!fir.ptr<i32>>>) -> (!fir.ref<!fir.box<!fir.ptr<i32>>>, !fir.ref<!fir.box<!fir.ptr<i32>>>)
  34 ! CHECK:           %[[VAL_5:.*]] = fir.alloca !fir.logical<4> {bindc_name = "l", uniq_name = "_QFtest2El"}
  35 ! CHECK:           %[[VAL_6:.*]]:2 = hlfir.declare %[[VAL_5]] {uniq_name = "_QFtest2El"} : (!fir.ref<!fir.logical<4>>) -> (!fir.ref<!fir.logical<4>>, !fir.ref<!fir.logical<4>>)
  36 ! CHECK:           %[[VAL_7:.*]] = fir.zero_bits !fir.ptr<none>
  37 ! CHECK:           %[[VAL_8:.*]] = fir.embox %[[VAL_7]] : (!fir.ptr<none>) -> !fir.box<!fir.ptr<none>>
  38 ! CHECK:           fir.store %[[VAL_8]] to %[[VAL_0]] : !fir.ref<!fir.box<!fir.ptr<none>>>
  39 ! CHECK:           %[[VAL_9:.*]]:2 = hlfir.declare %[[VAL_0]] {uniq_name = ".tmp.null_box"} : (!fir.ref<!fir.box<!fir.ptr<none>>>) -> (!fir.ref<!fir.box<!fir.ptr<none>>>, !fir.ref<!fir.box<!fir.ptr<none>>>)
  40 ! CHECK:           %[[VAL_10:.*]] = fir.load %[[VAL_4]]#1 : !fir.ref<!fir.box<!fir.ptr<i32>>>
  41 ! CHECK:           %[[VAL_11:.*]] = fir.load %[[VAL_9]]#1 : !fir.ref<!fir.box<!fir.ptr<none>>>
  42 ! CHECK:           %[[VAL_12:.*]] = fir.convert %[[VAL_11]] : (!fir.box<!fir.ptr<none>>) -> !fir.box<none>
  43 ! CHECK:           %[[VAL_13:.*]] = fir.convert %[[VAL_10]] : (!fir.box<!fir.ptr<i32>>) -> !fir.box<none>
  44 ! CHECK:           %[[VAL_14:.*]] = fir.call @_FortranAPointerIsAssociatedWith(%[[VAL_12]], %[[VAL_13]]) fastmath<contract> : (!fir.box<none>, !fir.box<none>) -> i1
  45 ! CHECK:           %[[VAL_15:.*]] = fir.convert %[[VAL_14]] : (i1) -> !fir.logical<4>
  46 ! CHECK:           hlfir.assign %[[VAL_15]] to %[[VAL_6]]#0 : !fir.logical<4>, !fir.ref<!fir.logical<4>>
  47 ! CHECK:           return
  48 ! CHECK:         }