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a94b721d26
While "null()" is accepted as a data statement constant when it corresponds to a pointer object, "null(mold=p)" and "null(p)" are not allowed. The current error messages simply complain that null is not an array. This patch adds a context-sensitive message to the effect that a data statement constant followed by non-empty parentheses must be an array or structure constructor. (Note that f18 can't simply special-case the name "null" when parsing data statement constants, since programs are free to repurpose that name as an array or derived type.) Differential Revision: https://reviews.llvm.org/D112740
98 lines
2.1 KiB
Fortran
98 lines
2.1 KiB
Fortran
! RUN: %python %S/test_errors.py %s %flang_fc1
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! Tests valid and invalid NULL initializers
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module m1
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implicit none
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!ERROR: No explicit type declared for 'null'
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private :: null
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end module
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module m2
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implicit none
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private :: null
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integer, pointer :: p => null()
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end module
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module m3
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private :: null
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integer, pointer :: p => null()
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end module
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module m4
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intrinsic :: null
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integer, pointer :: p => null()
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end module
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module m5
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external :: null
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!ERROR: Pointer initializer must be intrinsic NULL()
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integer, pointer :: p => null()
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end module
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module m6
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!ERROR: Symbol 'null' cannot have both INTRINSIC and EXTERNAL attributes
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integer, pointer :: p => null()
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external :: null
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end module
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module m7
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interface
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function null() result(p)
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integer, pointer :: p
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end function
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end interface
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!ERROR: Pointer initializer must be intrinsic NULL()
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integer, pointer :: p => null()
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end module
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module m8
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integer, pointer :: p => null()
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interface
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!ERROR: 'null' is already declared in this scoping unit
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function null() result(p)
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integer, pointer :: p
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end function
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end interface
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end module
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module m9a
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intrinsic :: null
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contains
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function foo()
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integer, pointer :: foo
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foo => null()
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end function
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end module
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module m9b
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use m9a, renamed => null, null => foo
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integer, pointer :: p => renamed()
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!ERROR: Pointer initializer must be intrinsic NULL()
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integer, pointer :: q => null()
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integer, pointer :: d1, d2
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data d1/renamed()/
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!ERROR: An initial data target must be a designator with constant subscripts
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data d2/null()/
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end module
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subroutine m10
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real, pointer :: x, y
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!ERROR: 'null' must be an array or structure constructor if used with non-empty parentheses as a DATA statement constant
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data x/null(y)/
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end
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subroutine m11
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type :: null
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integer :: mold
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end type
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type(null) :: obj(2)
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integer, parameter :: j = 0
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data obj/null(mold=j), null(j)/ ! both fine
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end subroutine
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subroutine m12
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integer, parameter :: j = 1
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integer, target, save :: null(1)
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integer, pointer :: p
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data p/null(j)/ ! ok
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end subroutine
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