[flang][NFC] Add global lowering tests

[clementval]

Summary

This patch adds some lowering tests for globals.

This patch is part of the upstreaming effort from fir-dev branch.

[clementval]

Add a test

[PeteSteinfeld]

All builds and tests correctly and looks good.

flang/test/Lower/default-initialization-globals.f90

+! Test default initialization of global variables (static init)
+! RUN: bbc %s -o - | FileCheck %s
+
+module tinit
+  real, target :: ziel(100)
+
+  type tno_init
+    integer :: k
+  end type
+
+  type t0
+    integer :: k = 66
+  end type
+
+  ! Test type that combines all kinds of components with and without
+  ! default initialization.
+  type t1
+    ! Simple type component with default init
+    integer :: i = 42
+    ! Simple type component without default init
+    integer :: j
+
+    ! Pointer component with a default initial target
+    real, pointer :: x(:) => ziel
+    ! Pointer component with no init
+    real, pointer :: y(:)
+    ! Pointer component with null init
+    real, pointer :: z(:) => NULL()
+
+    ! Character component with init
+    character(10) c1 = "hello"
+    ! Character component without init
+    character(10) c2
+
+    ! Component with a derived type that has default init
+    type(t0) :: somet0
+    ! Component with a derived type that has no default init.
+    type(tno_init) :: sometno_init
+    ! Component whose type default init is overridden by
+    ! default init for the component.
+    type(t0) :: somet0_2 = t0(33)
+    ! Array component with a derived type that has default init
+    type(t0) :: somet0_array
+  end type
+
+  ! Test type that extends type with default init.
+  type, extends(t0) :: textendst0
+    integer :: l
+  end type
+
+  ! Test type with default init in equivalences
+  type tseq
+    sequence
+    integer :: i = 2
+    integer :: j = 3
+  end type
+
+  ! Test scalar with default init
+  type(t0) :: at0
+! CHECK-LABEL: fir.global @_QMtinitEat0 : !fir.type<_QMtinitTt0{k:i32}> {
+  ! CHECK: %[[VAL_0:.*]] = arith.constant 66 : i32
+  ! CHECK: %[[VAL_1:.*]] = fir.undefined !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_2:.*]] = fir.insert_value %[[VAL_1]], %[[VAL_0]], ["k", !fir.type<_QMtinitTt0{k:i32}>] : (!fir.type<_QMtinitTt0{k:i32}>, i32) -> !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: fir.has_value %[[VAL_2]] : !fir.type<_QMtinitTt0{k:i32}>
+
+  ! Test array with default init
+  type(t0) :: bt0(100)
+! CHECK-LABEL: @_QMtinitEbt0 : !fir.array<100x!fir.type<_QMtinitTt0{k:i32}>> {
+  ! CHECK: %[[VAL_3:.*]] = arith.constant 66 : i32
+  ! CHECK: %[[VAL_4:.*]] = fir.undefined !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_5:.*]] = fir.insert_value %[[VAL_4]], %[[VAL_3]], ["k", !fir.type<_QMtinitTt0{k:i32}>] : (!fir.type<_QMtinitTt0{k:i32}>, i32) -> !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_6:.*]] = fir.undefined !fir.array<100x!fir.type<_QMtinitTt0{k:i32}>>
+  ! CHECK: %[[VAL_7:.*]] = fir.insert_on_range %[[VAL_6]], %[[VAL_5]] from (0) to (99) : (!fir.array<100x!fir.type<_QMtinitTt0{k:i32}>>, !fir.type<_QMtinitTt0{k:i32}>) -> !fir.array<100x!fir.type<_QMtinitTt0{k:i32}>>
+  ! CHECK: fir.has_value %[[VAL_7]] : !fir.array<100x!fir.type<_QMtinitTt0{k:i32}>>
+
+  ! Test default init overridden by explicit init
+  type(t0) :: ct0 = t0(42)
+! CHECK-LABEL: fir.global @_QMtinitEct0 : !fir.type<_QMtinitTt0{k:i32}> {
+  ! CHECK: %[[VAL_8:.*]] = arith.constant 42 : i32
+  ! CHECK: %[[VAL_9:.*]] = fir.undefined !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_10:.*]] = fir.insert_value %[[VAL_9]], %[[VAL_8]], ["k", !fir.type<_QMtinitTt0{k:i32}>] : (!fir.type<_QMtinitTt0{k:i32}>, i32) -> !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: fir.has_value %[[VAL_10]] : !fir.type<_QMtinitTt0{k:i32}>
+
+  ! Test a non trivial derived type mixing all sorts of default initialization
+  type(t1) :: dt1
+! CHECK-LABEL: @_QMtinitEdt1 : !fir.type<_QMtinitTt1{{.*}}> {
+  ! CHECK-DAG: %[[VAL_11:.*]] = arith.constant 42 : i32
+  ! CHECK-DAG: %[[VAL_12:.*]] = arith.constant 100 : index
+  ! CHECK-DAG: %[[VAL_13:.*]] = arith.constant 0 : index
+  ! CHECK-DAG: %[[VAL_14:.*]] = arith.constant 33 : i32
+  ! CHECK-DAG: %[[VAL_15:.*]] = arith.constant 66 : i32
+  ! CHECK: %[[VAL_16:.*]] = fir.undefined !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_17:.*]] = fir.insert_value %[[VAL_16]], %[[VAL_11]], ["i", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, i32) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_18:.*]] = fir.undefined i32
+  ! CHECK: %[[VAL_19:.*]] = fir.insert_value %[[VAL_17]], %[[VAL_18]], ["j", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, i32) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_20:.*]] = fir.address_of(@_QMtinitEziel) : !fir.ref<!fir.array<100xf32>>
+  ! CHECK: %[[VAL_21:.*]] = fir.shape %[[VAL_12]] : (index) -> !fir.shape<1>
+  ! CHECK: %[[VAL_22:.*]] = fir.embox %[[VAL_20]](%[[VAL_21]]) : (!fir.ref<!fir.array<100xf32>>, !fir.shape<1>) -> !fir.box<!fir.ptr<!fir.array<?xf32>>>
+  ! CHECK: %[[VAL_23:.*]] = fir.insert_value %[[VAL_19]], %[[VAL_22]], ["x", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.box<!fir.ptr<!fir.array<?xf32>>>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_24:.*]] = fir.zero_bits !fir.ptr<!fir.array<?xf32>>
+  ! CHECK: %[[VAL_25:.*]] = fir.shape %[[VAL_13]] : (index) -> !fir.shape<1>
+  ! CHECK: %[[VAL_26:.*]] = fir.embox %[[VAL_24]](%[[VAL_25]]) : (!fir.ptr<!fir.array<?xf32>>, !fir.shape<1>) -> !fir.box<!fir.ptr<!fir.array<?xf32>>>
+  ! CHECK: %[[VAL_27:.*]] = fir.insert_value %[[VAL_23]], %[[VAL_26]], ["y", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.box<!fir.ptr<!fir.array<?xf32>>>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_28:.*]] = fir.insert_value %[[VAL_27]], %[[VAL_26]], ["z", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.box<!fir.ptr<!fir.array<?xf32>>>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_29:.*]] = fir.string_lit "hello     "(10) : !fir.char<1,10>
+  ! CHECK: %[[VAL_30:.*]] = fir.insert_value %[[VAL_28]], %[[VAL_29]], ["c1", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.char<1,10>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_31:.*]] = fir.undefined !fir.char<1,10>
+  ! CHECK: %[[VAL_32:.*]] = fir.insert_value %[[VAL_30]], %[[VAL_31]], ["c2", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.char<1,10>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_33:.*]] = fir.undefined !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_34:.*]] = fir.insert_value %[[VAL_33]], %[[VAL_15]], ["k", !fir.type<_QMtinitTt0{k:i32}>] : (!fir.type<_QMtinitTt0{k:i32}>, i32) -> !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_35:.*]] = fir.insert_value %[[VAL_32]], %[[VAL_34]], ["somet0", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.type<_QMtinitTt0{k:i32}>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_36:.*]] = fir.undefined !fir.type<_QMtinitTtno_init{k:i32}>
+  ! CHECK: %[[VAL_37:.*]] = fir.insert_value %[[VAL_35]], %[[VAL_36]], ["sometno_init", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.type<_QMtinitTtno_init{k:i32}>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_38:.*]] = fir.insert_value %[[VAL_33]], %[[VAL_14]], ["k", !fir.type<_QMtinitTt0{k:i32}>] : (!fir.type<_QMtinitTt0{k:i32}>, i32) -> !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_39:.*]] = fir.insert_value %[[VAL_37]], %[[VAL_38]], ["somet0_2", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.type<_QMtinitTt0{k:i32}>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: %[[VAL_40:.*]] = fir.insert_value %[[VAL_39]], %[[VAL_34]], ["somet0_array", !fir.type<_QMtinitTt1{{.*}}>] : (!fir.type<_QMtinitTt1{{.*}}>, !fir.type<_QMtinitTt0{k:i32}>) -> !fir.type<_QMtinitTt1{{.*}}>
+  ! CHECK: fir.has_value %[[VAL_40]] : !fir.type<_QMtinitTt1{{.*}}>
+
+  ! Test a type extending other type with a default init
+  type(textendst0) :: etextendst0
+! CHECK-LABEL: @_QMtinitEetextendst0 : !fir.type<_QMtinitTtextendst0{k:i32,l:i32}> {
+  ! CHECK: %[[VAL_42:.*]] = arith.constant 66 : i32
+  ! CHECK: %[[VAL_43:.*]] = fir.undefined !fir.type<_QMtinitTtextendst0{k:i32,l:i32}>
+  ! CHECK: %[[VAL_44:.*]] = fir.insert_value %[[VAL_43]], %[[VAL_42]], ["k", !fir.type<_QMtinitTtextendst0{k:i32,l:i32}>] : (!fir.type<_QMtinitTtextendst0{k:i32,l:i32}>, i32) -> !fir.type<_QMtinitTtextendst0{k:i32,l:i32}>
+  ! CHECK: %[[VAL_45:.*]] = fir.undefined i32
+  ! CHECK: %[[VAL_46:.*]] = fir.insert_value %[[VAL_44]], %[[VAL_45]], ["l", !fir.type<_QMtinitTtextendst0{k:i32,l:i32}>] : (!fir.type<_QMtinitTtextendst0{k:i32,l:i32}>, i32) -> !fir.type<_QMtinitTtextendst0{k:i32,l:i32}>
+  ! CHECK: fir.has_value %[[VAL_46]] : !fir.type<_QMtinitTtextendst0{k:i32,l:i32}>
+end module
+
+
+! Test that default initialization is also applied to saved variables
+subroutine saved()
+  use tinit
+  type(t0), save :: savedt0
+! CHECK-LABEL: fir.global internal @_QFsavedEsavedt0 : !fir.type<_QMtinitTt0{k:i32}> {
+  ! CHECK: %[[VAL_47:.*]] = arith.constant 66 : i32
+  ! CHECK: %[[VAL_48:.*]] = fir.undefined !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: %[[VAL_49:.*]] = fir.insert_value %[[VAL_48]], %[[VAL_47]], ["k", !fir.type<_QMtinitTt0{k:i32}>] : (!fir.type<_QMtinitTt0{k:i32}>, i32) -> !fir.type<_QMtinitTt0{k:i32}>
+  ! CHECK: fir.has_value %[[VAL_49]] : !fir.type<_QMtinitTt0{k:i32}>
+end subroutine
+
+! Test default initialization in equivalences
+subroutine eqv()
+  use tinit
+  type(tseq), save :: somet
+  integer :: i(2)
+  equivalence (somet, i)
+! CHECK-LABEL: fir.global internal @_QFeqvEi : !fir.array<2xi32> {
+  ! CHECK-DAG: %[[VAL_50:.*]] = arith.constant 2 : i32
+  ! CHECK-DAG: %[[VAL_51:.*]] = arith.constant 3 : i32
+  ! CHECK: %[[VAL_52:.*]] = fir.undefined !fir.array<2xi32>
+  ! CHECK: %[[VAL_53:.*]] = fir.insert_value %[[VAL_52]], %[[VAL_50]], [0 : index] : (!fir.array<2xi32>, i32) -> !fir.array<2xi32>
+  ! CHECK: %[[VAL_54:.*]] = fir.insert_value %[[VAL_53]], %[[VAL_51]], [1 : index] : (!fir.array<2xi32>, i32) -> !fir.array<2xi32>
+  ! CHECK: fir.has_value %[[VAL_54]] : !fir.array<2xi32>
+end subroutine
+
+subroutine eqv_explicit_init()
+  use tinit
+  type(tseq), save :: somet
+  integer :: i(2) = [4, 5]
+  equivalence (somet, i)
+! CHECK-LABEL: fir.global internal @_QFeqv_explicit_initEi : !fir.array<2xi32> {
+  ! CHECK-DAG: %[[VAL_57:.*]] = arith.constant 4 : i32
+  ! CHECK-DAG: %[[VAL_58:.*]] = arith.constant 5 : i32
+  ! CHECK: %[[VAL_59:.*]] = fir.undefined !fir.array<2xi32>
+  ! CHECK: %[[VAL_60:.*]] = fir.insert_value %[[VAL_59]], %[[VAL_57]], [0 : index] : (!fir.array<2xi32>, i32) -> !fir.array<2xi32>
+  ! CHECK: %[[VAL_61:.*]] = fir.insert_value %[[VAL_60]], %[[VAL_58]], [1 : index] : (!fir.array<2xi32>, i32) -> !fir.array<2xi32>
+  ! CHECK: fir.has_value %[[VAL_61]] : !fir.array<2xi32>
+end subroutine
+
+subroutine eqv_same_default_init()
+  use tinit
+  type(tseq), save :: somet1(2), somet2
+  equivalence (somet1(1), somet2)
+! CHECK-LABEL: fir.global internal @_QFeqv_same_default_initEsomet1 : !fir.array<2xi64> {
+  ! CHECK: %[[VAL_62:.*]] = arith.constant 12884901890 : i64
+  ! CHECK: %[[VAL_63:.*]] = fir.undefined !fir.array<2xi64>
+  ! CHECK: %[[VAL_64:.*]] = fir.insert_on_range %[[VAL_63]], %[[VAL_62]] from (0) to (1) : (!fir.array<2xi64>, i64) -> !fir.array<2xi64>
+  ! CHECK: fir.has_value %[[VAL_64]] : !fir.array<2xi64>
+end subroutine
+
+subroutine eqv_full_overlaps_with_explicit_init()
+  use tinit
+  type(tseq), save :: somet
+  integer, save :: link(4)
+  integer :: i(2) = [5, 6]
+  integer :: j(2) = [7, 8]
+  ! Equivalence: somet fully covered by explicit init.
+  !   i(1)=5 | i(2)=6  |    -    |  -
+  !     -    | somet%i | somet%j |
+  !     -    |    -    | j(1)=7  | j(2)=8
+  equivalence (i, link(1))
+  equivalence (somet, link(2))
+  equivalence (j, link(3))
+! CHECK-LABEL: fir.global internal @_QFeqv_full_overlaps_with_explicit_initEi : !fir.array<4xi32> {
+  ! CHECK-DAG: %[[VAL_73:.*]] = arith.constant 5 : i32
+  ! CHECK-DAG: %[[VAL_74:.*]] = arith.constant 6 : i32
+  ! CHECK-DAG: %[[VAL_75:.*]] = arith.constant 7 : i32
+  ! CHECK-DAG: %[[VAL_76:.*]] = arith.constant 8 : i32
+  ! CHECK-DAG: %[[VAL_77:.*]] = fir.undefined !fir.array<4xi32>
+  ! CHECK-DAG: %[[VAL_78:.*]] = fir.insert_value %[[VAL_77]], %[[VAL_73]], [0 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+  ! CHECK-DAG: %[[VAL_79:.*]] = fir.insert_value %[[VAL_78]], %[[VAL_74]], [1 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+  ! CHECK-DAG: %[[VAL_80:.*]] = fir.insert_value %[[VAL_79]], %[[VAL_75]], [2 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+  ! CHECK-DAG: %[[VAL_81:.*]] = fir.insert_value %[[VAL_80]], %[[VAL_76]], [3 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+  ! CHECK-DAG: fir.has_value %[[VAL_81]] : !fir.array<4xi32>
+end subroutine
+
+subroutine eqv_partial_overlaps_with_explicit_init()
+  use tinit
+  type(tseq), save :: somet
+  integer, save :: link(4)
+  integer :: i(2) = [5, 6]
+  integer :: j = 7
+  ! `somet` is only partially covered by explicit init, somet%j default
+  ! init value should be used in the equiv storage init to match nvfortran,
+  ! ifort, and nagfor behavior (gfortran refuses this code). 19.5.3.4 point
+  ! 10 specifies that explicit initialization overrides default initialization.
+  !   i(1)=5 | i(2)=6  |    -    |  -
+  !     -    | somet%i | somet%j |
+  !     -    |    -    |    -    | j=7
+  equivalence (i, link(1))
+  equivalence (somet, link(2))
+  equivalence (j, link(4))
+! CHECK-LABEL: fir.global internal @_QFeqv_partial_overlaps_with_explicit_initEi : !fir.array<4xi32>
+   ! CHECK-DAG: %[[VAL_82:.*]] = arith.constant 5 : i32
+   ! CHECK-DAG: %[[VAL_83:.*]] = arith.constant 6 : i32
+   ! CHECK-DAG: %[[VAL_84:.*]] = arith.constant 3 : i32
+   ! CHECK-DAG: %[[VAL_85:.*]] = arith.constant 7 : i32
+   ! CHECK: %[[VAL_86:.*]] = fir.undefined !fir.array<4xi32>
+   ! CHECK: %[[VAL_87:.*]] = fir.insert_value %[[VAL_86]], %[[VAL_82]], [0 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+   ! CHECK: %[[VAL_88:.*]] = fir.insert_value %[[VAL_87]], %[[VAL_83]], [1 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+   ! CHECK: %[[VAL_89:.*]] = fir.insert_value %[[VAL_88]], %[[VAL_84]], [2 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+   ! CHECK: %[[VAL_90:.*]] = fir.insert_value %[[VAL_89]], %[[VAL_85]], [3 : index] : (!fir.array<4xi32>, i32) -> !fir.array<4xi32>
+   ! CHECK: fir.has_value %[[VAL_90]] : !fir.array<4xi32>
+end subroutine

flang/test/Lower/global-format-strings.f90

+! RUN: bbc -emit-fir -o - %s | FileCheck %s
+
+! Test checks whether the text of the format statement is hashconed into a
+! global similar to a CHARACTER literal and then referenced.
+
+program other
+  write(10, 1008)
+  ! CHECK:  fir.address_of(@{{.*}}) :
+1008 format('ok')
+end
+! CHECK-LABEL: fir.global linkonce @_QQcl.28276F6B2729 constant
+! CHECK: %[[lit:.*]] = fir.string_lit "('ok')"(6) : !fir.char<1,6>
+! CHECK: fir.has_value %[[lit]] : !fir.char<1,6>
+! CHECK: }

flang/test/Lower/global-initialization.f90

+! RUN: bbc %s -o - | FileCheck %s
+
+program bar
+! CHECK: fir.address_of(@[[name1:.*]]my_data)
+  integer, save :: my_data = 1
+  print *, my_data
+contains
+
+! CHECK-LABEL: func @_QFPfoo
+subroutine foo()
+! CHECK: fir.address_of(@[[name2:.*foo.*my_data]])
+  integer, save :: my_data = 2
+  print *, my_data + 1
+end subroutine
+
+! CHECK-LABEL: func @_QFPfoo2
+subroutine foo2()
+! CHECK: fir.address_of(@[[name3:.*foo2.*my_data]])
+  integer, save :: my_data
+  my_data = 4
+  print *, my_data
+end subroutine
+
+! CHECK-LABEL: func @_QFPfoo3
+subroutine foo3()
+! CHECK-DAG: fir.address_of(@[[name4:.*foo3.*idata]]){{.*}}fir.array<5xi32>
+! CHECK-DAG: fir.address_of(@[[name5:.*foo3.*rdata]]){{.*}}fir.array<3xf16>
+! CHECK-DAG: fir.address_of(@[[name6:.*foo3.*my_data]]){{.*}}fir.array<2x4xi64>
+  integer*4, dimension(5), save :: idata = (/ (i*i, i=1,5) /)
+  integer*8, dimension(2, 10:13), save :: my_data = reshape((/1,2,3,4,5,6,7,8/), shape(my_data))
+  real*2, dimension(7:9), save :: rdata = (/100., 99., 98./)
+  print *, rdata(9)
+  print *, idata(3)
+  print *, my_data(1,11)
+end subroutine
+end program
+
+! CHECK: fir.global internal @[[name1]]
+! CHECK: fir.global internal @[[name2]]
+! CHECK: fir.global internal @[[name3]]
+! CHECK-DAG: fir.global internal @[[name4]]{{.*}}fir.array<5xi32>
+! CHECK-DAG: fir.global internal @[[name5]]{{.*}}fir.array<3xf16>
+! CHECK-DAG: fir.global internal @[[name6]]{{.*}}fir.array<2x4xi64>