[flang] Add a semantics test for co_broadcast

[rouson]

Summary

This patch checks for valid and invalid forms of calls to the collective subroutine co_broadcast.

[rouson]

Fix procedure name in To Do list comment.

[ekieri]

Can you please base the patch on main? This diff looks like a small typo fix, but the whole file is new. That would also help the pre-merge tester to apply your patch.

[rouson]

Rebased off of main and ensured that the whole file appears in the diff.

[rouson]

As suggested in Diff D113086, the updated diff

1. Removes trailing whitespace if present.
2. Cites the section of the standard that defines the co_broadcast interface.
3. Adds a check for an error in which the first co_broadcast argument is coindexed.

[rouson]

This patch makes the co_broadcast test more similar to the other collectives tests by

1. Adding more types for the 'a' argument,
2. Varying the type of the 'a' argument's types more frequently throughout the test,
3. Clarifying the To Do comment,
4. Replacing several "to be determined" error messages, and
5. More broadly test argument semantics.

[ktras]

Similarly to comments I made in my review for D116133, the co_broadcast test could be improved by adding a call which contains optional arguments, but not required arguments. Also, there could be checks added to try and violate the intent-spec of stat and errmsg. There are also some non-standard single quote characters in the expected error messages that should be replaced.

[ktras]

flang/test/Semantics/collectives04.f90

43

Trailing comma in argument list should be removed

[ktras]

flang/test/Semantics/collectives04.f90

61

65

[ktras]

Please add the source_image argument to any of the non-standard conforming calls where you want to test errors other than the missing source_image argument. If you do this, then the expected error messages you provided will be correct.

[rouson]

1. Fixed on typo: removed a trailing comma.
2. Added check for missing mandatory 'a' argument.
3. Added test for 'stat' argument intent(out) .
4. Added check for 'errmsg' argument intent(inout).
5. Replaced non-standard single-quote characters.

[klausler]

I missed something here: how are single quote characters nonstandard?

[ktras]

In D113084#3225876, @klausler wrote:

I missed something here: how are single quote characters nonstandard?

The character ‘ is nonstandard in the sense that it is not the single quote character that is used in the error messages. So I was suggesting on this differential and on D116133 for @rouson to change the ‘ character to ', which he has done.

[ktras]

The updated patch based on feedback looks great! LGTM.

flang/test/Semantics/collectives04.f90

+! RUN: %python %S/test_errors.py %s %flang_fc1
+! XFAIL: *
+! This test checks for semantic errors in co_broadcast subroutine calls based on
+! the co_broadcast interface defined in section 16.9.46 of the Fortran 2018 standard.
+! To Do: add co_broadcast to the list of intrinsics
+
+program test_co_broadcast
+  implicit none
+
+  type foo_t
+  end type
+
+  integer          i, integer_array(1), coindexed_integer[*], status
+  character(len=1) c, character_array(1), coindexed_character[*], message
+  double precision d, double_precision_array(1)
+  type(foo_t)      f
+  real             r, real_array(1), coindexed_real[*]
+  complex          z, complex_array
+  logical bool
+
+  !___ standard-conforming calls with no keyword arguments ___
+  call co_broadcast(i, 1)
+  call co_broadcast(c, 1)
+  call co_broadcast(d, 1)
+  call co_broadcast(f, 1)
+  call co_broadcast(r, 1)
+  call co_broadcast(z, 1)
+  call co_broadcast(i, 1, status)
+  call co_broadcast(i, 1, status, message)
+
+  !___ standard-conforming calls with keyword arguments ___
+
+  ! all arguments present
+  call co_broadcast(a=i, source_image=1, stat=status, errmsg=message) 
+  call co_broadcast(source_image=1, a=i, errmsg=message, stat=status) 
+
+  ! one optional argument not present
+  call co_broadcast(a=c,                 stat=status, errmsg=message) 
+  call co_broadcast(a=d, source_image=1,              errmsg=message)
+  call co_broadcast(a=f, source_image=1, stat=status                )
+
+  ! two optional arguments not present
+  call co_broadcast(a=r, source_image=1,                            ) 
+  call co_broadcast(a=z,                 stat=status                )
+  call co_broadcast(a=i,                              errmsg=message) 
+
+  ! no optional arguments present
+  call co_broadcast(a=i) 
+
+  !___ non-standard-conforming calls ___
+
+  ! argument 'a' is intent(inout)
+  !ERROR: Actual argument associated with INTENT(IN OUT) dummy argument ‘a=’ must be definable
+  call co_broadcast(a=1+1)
+  
+  ! argument 'a' shall not be a coindexed object
+  !ERROR: to be determined
+  call co_broadcast(a=coindexed_real[1])
+  
+  ! 'source_image' argument shall be an integer
+  !ERROR: too many actual arguments for intrinsic 'co_broadcast'
+  call co_broadcast(i, source_image=bool)
+  
+  ! 'source_image' argument shall be an integer scalar
+  !ERROR: too many actual arguments for intrinsic 'co_broadcast'
+  call co_broadcast(c, source_image=integer_array)
+  
+  ! 'stat' argument shall be noncoindexed
+  !ERROR: to be determined
+  call co_broadcast(d, stat=coindexed_integer[1])
+ 
+  ! 'stat' argument shall be an integer
+  !ERROR: Actual argument for 'stat=' has bad type 'CHARACTER(KIND=1,LEN=1_8)'
+  call co_broadcast(r, stat=message)
+ 
+  ! 'stat' argument shall be an integer scalar
+  !ERROR: ‘stat=’ argument has unacceptable rank 1
+  call co_broadcast(i, stat=integer_array)
+ 
+  ! 'errmsg' argument shall be noncoindexed
+  !ERROR: to be determined
+  call co_broadcast(c, errmsg=coindexed_character[1])
+ 
+  ! 'errmsg' argument shall be character scalar
+  !ERROR: ‘errmsg=’ argument has unacceptable rank 1
+  call co_broadcast(d, errmsg=character_array)
+ 
+  ! the error is seen as too many arguments to the co_broadcast() call
+  !ERROR: too many actual arguments for intrinsic 'co_broadcast'
+  call co_broadcast(r, source_image=1, stat=status, errmsg=message, 3.4)
+  
+  ! keyword argument with incorrect name
+  !ERROR: unknown keyword argument to intrinsic 'co_broadcast'
+  call co_broadcast(fake=3.4)
+  
+end program test_co_broadcast