a7e91f2335
When we encounter a ProcedureDesignator, if it is an external procedure (i.e. there is no visible declaration) it must be implicitly created in the global scope, not the current scope. If there is already a symbol there (i.e. a module) it is an error, even if that symbol is not visible due to an IMPORT statement. Original-commit: flang-compiler/f18@835e234ded Reviewed-on: https://github.com/flang-compiler/f18/pull/249 Tree-same-pre-rewrite: false
101 lines
2.4 KiB
Fortran
101 lines
2.4 KiB
Fortran
! Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
|
|
!
|
|
! Licensed under the Apache License, Version 2.0 (the "License");
|
|
! you may not use this file except in compliance with the License.
|
|
! You may obtain a copy of the License at
|
|
!
|
|
! http://www.apache.org/licenses/LICENSE-2.0
|
|
!
|
|
! Unless required by applicable law or agreed to in writing, software
|
|
! distributed under the License is distributed on an "AS IS" BASIS,
|
|
! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
! See the License for the specific language governing permissions and
|
|
! limitations under the License.
|
|
|
|
integer :: y
|
|
procedure() :: a
|
|
procedure(real) :: b
|
|
call a ! OK - can be function or subroutine
|
|
!ERROR: Cannot call subroutine 'a' like a function
|
|
c = a()
|
|
!ERROR: Cannot call function 'b' like a subroutine
|
|
call b
|
|
!ERROR: Cannot call function 'y' like a subroutine
|
|
call y
|
|
call x
|
|
!ERROR: Cannot call subroutine 'x' like a function
|
|
z = x()
|
|
end
|
|
|
|
subroutine s
|
|
!ERROR: Cannot call function 'f' like a subroutine
|
|
call f
|
|
!ERROR: Cannot call subroutine 's' like a function
|
|
i = s()
|
|
contains
|
|
function f()
|
|
end
|
|
end
|
|
|
|
subroutine s2
|
|
! subroutine vs. function is determined by use
|
|
external :: a, b
|
|
call a()
|
|
!ERROR: Cannot call subroutine 'a' like a function
|
|
x = a()
|
|
x = b()
|
|
!ERROR: Cannot call function 'b' like a subroutine
|
|
call b()
|
|
end
|
|
|
|
subroutine s3
|
|
! subroutine vs. function is determined by use, even in internal subprograms
|
|
external :: a
|
|
procedure() :: b
|
|
contains
|
|
subroutine s3a()
|
|
x = a()
|
|
call b()
|
|
end
|
|
subroutine s3b()
|
|
!ERROR: Cannot call function 'a' like a subroutine
|
|
call a()
|
|
!ERROR: Cannot call subroutine 'b' like a function
|
|
x = b()
|
|
end
|
|
end
|
|
|
|
module m
|
|
! subroutine vs. function is determined at end of specification part
|
|
external :: a
|
|
procedure() :: b
|
|
contains
|
|
subroutine s()
|
|
call a()
|
|
!ERROR: Cannot call subroutine 'b' like a function
|
|
x = b()
|
|
end
|
|
end
|
|
|
|
! Call to entity in global scope, even with IMPORT, NONE
|
|
subroutine s4
|
|
block
|
|
import, none
|
|
integer :: i
|
|
!ERROR: Use of 'm' as a procedure conflicts with its declaration
|
|
i = m()
|
|
!ERROR: Use of 'm' as a procedure conflicts with its declaration
|
|
call m()
|
|
end block
|
|
end
|
|
|
|
! Call to entity in global scope, even with IMPORT, NONE
|
|
subroutine s5
|
|
block
|
|
import, none
|
|
integer :: i
|
|
i = foo()
|
|
!ERROR: Cannot call function 'foo' like a subroutine
|
|
call foo()
|
|
end block
|
|
end
|