flang/test/Semantics/allocate11.f90

   1 ! RUN: %python %S/test_errors.py %s %flang_fc1
   2 ! Check for semantic errors in ALLOCATE statements
   3
   4 ! TODO: Function Pointer in allocate and derived types!
   5
   6 ! Rules I should know when working with coarrays and derived type:
   7
   8 ! C736: If EXTENDS appears and the type being defined has a coarray ultimate
   9 ! component, its parent type shall have a coarray ultimate component.
  10
  11 ! C746: (R737) If a coarray-spec appears, it shall be a deferred-coshape-spec-list
  12 ! and the component shall have the ALLOCATABLE attribute.
  13
  14 ! C747: If a coarray-spec appears, the component shall not be of type C_PTR or
  15 ! C_FUNPTR from the intrinsic module ISO_C_BINDING (18.2), or of type TEAM_TYPE from the
  16 ! intrinsic module ISO_FORTRAN_ENV (16.10.2).
  17
  18 ! C748: A data component whose type has a coarray ultimate component shall be a
  19 ! nonpointer nonallocatable scalar and shall not be a coarray.
  20
  21 ! 7.5.4.3 Coarray components
  22 ! 7.5.6 Final subroutines: C786
  23
  24
  25 ! C825 An entity whose type has a coarray ultimate component shall be a
  26 ! nonpointer nonallocatable scalar, shall not be a coarray, and shall not be a function result.
  27
  28 ! C826 A coarray or an object with a coarray ultimate component shall be an
  29 ! associate name, a dummy argument, or have the ALLOCATABLE or SAVE attribute.
  30
  31 subroutine C937(var)
  32 ! Type-spec shall not specify a type that has a coarray ultimate component.
  33
  34
  35   type A
  36     real, allocatable :: x[:]
  37   end type
  38
  39   type B
  40     type(A) y
  41     !ERROR: A component with a POINTER or ALLOCATABLE attribute may not be of a type with a coarray ultimate component (named 'y%x')
  42     type(B), pointer :: forward
  43     real :: u
  44   end type
  45
  46   type C
  47     type(B) z
  48   end type
  49
  50   type D
  51     !ERROR: A component with a POINTER or ALLOCATABLE attribute may not be of a type with a coarray ultimate component (named 'x')
  52     type(A), pointer :: potential
  53   end type
  54
  55
  56
  57   class(*), allocatable :: var
  58   ! unlimited polymorphic is the ONLY way to get an allocatable/pointer 'var' that can be
  59   ! allocated with a type-spec T that has coarray ultimate component without
  60   ! violating other rules than C937.
  61   ! Rationale:
  62   !   C934 => var must be type compatible with T.
  63   !        => var type is T, a type P extended by T, or unlimited polymorphic
  64   !   C825 => var cannot be of type T.
  65   !   C736 => all parent types P of T must have a coarray ultimate component
  66   !        => var cannot be of type P (C825)
  67   !        => if var can be defined, it can only be unlimited polymorphic
  68
  69   ! Also, as per C826 or C852, var can only be an allocatable, not a pointer
  70
  71   ! OK, x is not an ultimate component
  72   allocate(D:: var)
  73
  74   !ERROR: Type-spec in ALLOCATE must not specify a type with a coarray ultimate component
  75   allocate(A:: var)
  76   !ERROR: Type-spec in ALLOCATE must not specify a type with a coarray ultimate component
  77   allocate(B:: var)
  78   !ERROR: Type-spec in ALLOCATE must not specify a type with a coarray ultimate component
  79   allocate(C:: var)
  80 end subroutine
  81
  82 !TODO: type extending team_type !? subcomponents !?
  83
  84 subroutine C938_C947(var2, ptr, ptr2, fptr, my_team, srca)
  85 ! If an allocate-object is a coarray, type-spec shall not specify type C_PTR or
  86 ! C_FUNPTR from the intrinsic module ISO_C_BINDING, or type TEAM_TYPE from the intrinsic module
  87 ! ISO_FORTRAN_ENV.
  88   use ISO_FORTRAN_ENV
  89   use ISO_C_BINDING
  90
  91   type A(k, l)
  92     integer, kind :: k
  93     integer, len :: l
  94     real(kind=k) x(l,l)
  95   end type
  96
  97 ! Again, I do not see any other way to violate this rule and not others without
  98 ! having var being an unlimited polymorphic.
  99 ! Suppose var of type P and T, the type in type-spec
 100 ! Per C934, P must be compatible with T. P cannot be a forbidden type per C824.
 101 ! Per C728 and 7.5.7.1, P cannot extend a c_ptr or _c_funptr. hence, P has to be
 102 ! unlimited polymorphic or a type that extends TEAM_TYPE.
 103   class(*), allocatable :: var[:], var2(:)[:]
 104   class(*), allocatable :: varok, varok2(:)
 105
 106   Type(C_PTR) :: ptr, ptr2(2:10)
 107   Type(C_FUNPTR) fptr
 108   Type(TEAM_TYPE) my_team
 109   Type(A(4, 10)) :: srca
 110
 111   ! Valid constructs
 112   allocate(real:: var[5:*])
 113   allocate(A(4, 10):: var[5:*])
 114   allocate(TEAM_TYPE:: varok, varok2(2))
 115   allocate(C_PTR:: varok, varok2(2))
 116   allocate(C_FUNPTR:: varok, varok2(2))
 117
 118   !ERROR: Type-Spec in ALLOCATE must not be TEAM_TYPE from ISO_FORTRAN_ENV when an allocatable object is a coarray
 119   allocate(TEAM_TYPE:: var[5:*])
 120   !ERROR: Type-Spec in ALLOCATE must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 121   allocate(C_PTR:: varok, var[5:*])
 122   !ERROR: Type-Spec in ALLOCATE must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 123   allocate(C_FUNPTR:: var[5:*])
 124   !ERROR: Type-Spec in ALLOCATE must not be TEAM_TYPE from ISO_FORTRAN_ENV when an allocatable object is a coarray
 125   allocate(TEAM_TYPE:: var2(2)[5:*])
 126   !ERROR: Type-Spec in ALLOCATE must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 127   allocate(C_PTR:: var2(2)[5:*])
 128   !ERROR: Type-Spec in ALLOCATE must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 129   allocate(C_FUNPTR:: varok2(2), var2(2)[5:*])
 130
 131
 132 ! C947: The declared type of source-expr shall not be C_PTR or C_FUNPTR from the
 133 ! intrinsic module ISO_C_BINDING, or TEAM_TYPE from the intrinsic module
 134 ! ISO_FORTRAN_ENV, if an allocateobject is a coarray.
 135 !
 136 !  ! Valid constructs
 137   allocate(var[5:*], SOURCE=cos(0.5_4))
 138   allocate(var[5:*], MOLD=srca)
 139   allocate(varok, varok2(2), SOURCE=ptr)
 140   allocate(varok2, MOLD=ptr2)
 141   allocate(varok, varok2(2), SOURCE=my_team)
 142   allocate(varok, varok2(2), MOLD=fptr)
 143
 144   !ERROR: SOURCE or MOLD expression type must not be TEAM_TYPE from ISO_FORTRAN_ENV when an allocatable object is a coarray
 145   allocate(var[5:*], SOURCE=my_team)
 146   !ERROR: SOURCE or MOLD expression type must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 147   allocate(var[5:*], SOURCE=ptr)
 148   !ERROR: SOURCE or MOLD expression type must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 149   allocate(varok, var[5:*], MOLD=ptr2(2))
 150   !ERROR: SOURCE or MOLD expression type must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 151   allocate(var[5:*], MOLD=fptr)
 152   !ERROR: SOURCE or MOLD expression type must not be TEAM_TYPE from ISO_FORTRAN_ENV when an allocatable object is a coarray
 153   allocate(var2(2)[5:*], MOLD=my_team)
 154   !ERROR: SOURCE or MOLD expression type must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 155   allocate(var2(2)[5:*], MOLD=ptr)
 156   !ERROR: SOURCE or MOLD expression type must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 157   allocate(var2(2)[5:*], SOURCE=ptr2)
 158   !ERROR: SOURCE or MOLD expression type must not be C_PTR or C_FUNPTR from ISO_C_BINDING when an allocatable object is a coarray
 159   allocate(varok2(2), var2(2)[5:*], SOURCE=fptr)
 160
 161 end subroutine