[flang] expand the this_image test coverage

Add a test with a range of this_image() intrinsic function
invocations, including a comprehensive set of standard-conforming
keyword and non-keyword arguments with and without optional
arguments present and with argument positions covering all
possible orderings.  Also test that several non-conforming
this_image() invocations generate the correct error messages.

Differential Revision: https://reviews.llvm.org/D123331

flang/test/Semantics/this_image02.f90

@@ -0,0 +1,128 @@
+! RUN: %python %S/test_errors.py %s %flang_fc1
+! XFAIL: *
+! Check for semantic errors in this_image() function calls
+
+program this_image_tests
+  use iso_fortran_env, only : team_type
+  implicit none
+
+  !ERROR: Coarray 'team_coarray' may not have type TEAM_TYPE, C_PTR, or C_FUNPTR
+  type(team_type) team_coarray[*]
+  type(team_type) home, league(2)
+  integer n, i, array(1), non_coarray(1), co_array[*]
+  integer, allocatable :: images(:)
+  logical non_integer
+
+  !___ standard-conforming statement with no optional arguments present ___
+  n = this_image()
+
+  !___ standard-conforming statements with team argument present ___
+  n = this_image(home)
+  n = this_image(team=home)
+  n = this_image(league(1))
+
+  !___ standard-conforming statements with coarray argument present ___
+  images = this_image(co_array)
+  images = this_image(coarray=co_array)
+
+  !___ standard-conforming statements with coarray and team arguments present ___
+  images = this_image(co_array, home)
+  images = this_image(co_array, team=home)
+  images = this_image(team_coarray, team=home)
+  images = this_image(team_coarray[1], team=home)
+  images = this_image(coarray=co_array, team=home)
+  images = this_image(team=home, coarray=co_array)
+
+  !___ standard-conforming statements with coarray and dim arguments present ___
+  n = this_image(co_array, i)
+  n = this_image(co_array, dim=i)
+  n = this_image(coarray=co_array, dim=i)
+  n = this_image(dim=i, coarray=co_array)
+
+  !___ standard-conforming statements with all arguments present ___
+  n = this_image(co_array, i, home)
+  n = this_image(co_array, i, team=home)
+  n = this_image(co_array, dim=i, team=home)
+  n = this_image(co_array, team=home, dim=i)
+
+  n = this_image(coarray=co_array, dim=i, team=home)
+  n = this_image(coarray=co_array, team=home, dim=i)
+
+  n = this_image(dim=i, coarray=co_array, team=home)
+  n = this_image(dim=i, team=home, coarray=co_array)
+
+  n = this_image(team=home, dim=i, coarray=co_array)
+  n = this_image(team=home, coarray=co_array, dim=i)
+
+  !___ non-conforming statements ___
+
+  !ERROR: TBD
+  n = this_image(co_array)
+
+  !ERROR: missing mandatory 'dim=' argument
+  n = this_image(i)
+
+  !ERROR: missing mandatory 'coarray=' argument
+  n = this_image(dim=i)
+
+  !ERROR: Actual argument for 'dim=' has bad type 'team_type'
+  n = this_image(i, home)
+
+  !ERROR: missing mandatory 'dim=' argument
+  n = this_image(i, team=home)
+
+  !ERROR: TBD
+  n = this_image(coarray=co_array, dim=2)
+
+  !ERROR: missing mandatory 'coarray=' argument
+  n = this_image(dim=i, team=home)
+
+  !ERROR: missing mandatory 'coarray=' argument
+  n = this_image(team=home, dim=i)
+
+  ! Doesn't produce an error
+  n = this_image(coarray=co_array, i)
+
+  !ERROR: No explicit type declared for 'team'
+  images = this_image(coarray=co_array, team)
+
+  ! non-scalar team_type argument 
+  !ERROR: missing mandatory 'coarray=' argument
+  n = this_image(team=league)
+
+  ! incorrectly typed argument
+  !ERROR: missing mandatory 'dim=' argument
+  n = this_image(3.4)
+
+  !ERROR: too many actual arguments for intrinsic 'this_image'
+  n = this_image(co_array, i, home, 0)
+
+  ! keyword argument with incorrect type
+  !ERROR: missing mandatory 'dim=' argument
+  images = this_image(coarray=non_coarray)
+
+  ! incorrect keyword argument name but valid type (type number)
+  !ERROR: unknown keyword argument to intrinsic 'this_image'
+  images = this_image(co_array=co_array)
+
+  ! incorrect keyword argument name but valid type (team_type)
+  !ERROR: unknown keyword argument to intrinsic 'this_image'
+  n = this_image(my_team=home)
+
+  ! correct keyword argument name but mismatched type
+  !ERROR: Actual argument for 'team=' has bad type 'INTEGER(4)'
+  n = this_image(co_array, i, team=-1)
+
+  !ERROR: 'dim=' argument has unacceptable rank 1
+  n = this_image(co_array, array )
+
+  !ERROR: unknown keyword argument to intrinsic 'this_image'
+  n = this_image(co_array, dims=i)
+
+  !ERROR: Actual argument for 'dim=' has bad type 'LOGICAL(4)'
+  n = this_image(co_array, non_integer)
+
+  ! A this_image reference with a coarray argument of team type shall also have a team argument
+  ! Doesn't produce an error
+  images = this_image(team_coarray)
+end program this_image_tests