Fortran: Improve F2018 TEAM handling [PR87326, PR87556, PR88254, PR103896]

Improve the implementation of F2018 TEAM handling routines. Add
runtime-functions to caf_single to allow testing.

	PR fortran/87326
	PR fortran/87556
	PR fortran/88254
	PR fortran/103796

gcc/fortran/ChangeLog:

	* coarray.cc (split_expr_at_caf_ref): Treat polymorphic types
	correctly.  Ensure resolve of expression after coindex.
	(create_allocated_callback): Fix parameter of allocated function
	for coarrays.
	(coindexed_expr_callback): Improve detection of coarrays in
	allocated function.
	* decl.cc (gfc_match_end): Add team block matching.
	* dump-parse-tree.cc (show_code_node): Dump change team block as
	such.
	* frontend-passes.cc (gfc_code_walker): Recognice team block.
	* gfortran.texi: Add documentation for team api functions.
	* intrinsic.texi: Add documentation about team_type in
	iso_fortran_env module.
	* iso-fortran-env.def (team_type): Use helper to get pointer
	kind.
	* match.cc (gfc_match_associate): Factor out matching of
	association list, because it is used in change team as well.
	(check_coarray_assoc): Ensure, that the association is to a
	coarray.
	(match_association_list): Match a list of association either in
	associate or in change team.
	(gfc_match_form_team): Match form team correctly include
	new_index.
	(gfc_match_change_team): Match change team with association
	list.
	(gfc_match_end_team): Match end team including stat and errmsg.
	(gfc_match_return): Prevent return from team block.
	* parse.cc (decode_statement): Sort team block.
	(next_statement): Same.
	(check_statement_label): Same.
	(accept_statement): Same.
	(verify_st_order): Same.
	(parse_associate): Renamed to move_associates_to_block...
	(move_associates_to_block): ... to enable reuse for change team.
	(parse_change_team): Parse it as block.
	(parse_executable): Same.
	* parse.h (enum gfc_compile_state): Add team block as compiler
	state.
	* resolve.cc (resolve_scalar_argument): New function to resolve
	an argument to a statement as a scalar.
	(resolve_form_team): Resolve its members.
	(resolve_change_team): Same.
	(resolve_branch): Prevent branch from jumping out of team block.
	(check_team): Removed.
	* trans-decl.cc (gfc_build_builtin_function_decls): Add stat and
	errmsg to team API functions and update their arguments.
	* trans-expr.cc (gfc_trans_subcomponent_assign): Also null the
	token when moving memory or an allocated() will not detect a
	free.
	* trans-intrinsic.cc (gfc_conv_intrinsic_caf_is_present_remote):
	Adapt to signature change no longer a pointer-pointer.
	* trans-stmt.cc (gfc_trans_form_team): Translate a form team
	including new_index.
	(gfc_trans_change_team): Translate a change team as a block.

libgfortran/ChangeLog:

	* caf/libcaf.h: Remove commented block.
	(_gfortran_caf_form_team): Allow for all relevant arguments.
	(_gfortran_caf_change_team): Same.
	(_gfortran_caf_end_team): Same.
	(_gfortran_caf_sync_team): Same.
	* caf/single.c (struct caf_single_team): Team handling
	structures.
	(_gfortran_caf_init): Initialize initial team.
	(free_team_list): Free all teams and the memory they hold.
	(_gfortran_caf_finalize): Free initial and sibling teams.
	(_gfortran_caf_register): Add memory registered to current team.
	(_gfortran_caf_deregister): Unregister memory from current team.
	(_gfortran_caf_is_present_on_remote): Check token's memptr for
	llocation.  May have been deallocated by an end team.
	(_gfortran_caf_form_team): Push a new team stub to the list.
	(_gfortran_caf_change_team): Push a formed team on top of the
	ctive teams stack.
	(_gfortran_caf_end_team): End the active team, free all memory
	allocated during its livespan.
	(_gfortran_caf_sync_team): Take stat and errmsg into account.

gcc/testsuite/ChangeLog:

	* gfortran.dg/team_change_2.f90: New test.
	* gfortran.dg/team_change_3.f90: New test.
	* gfortran.dg/team_end_2.f90: New test.
	* gfortran.dg/team_end_3.f90: New test.
	* gfortran.dg/team_form_2.f90: New test.
	* gfortran.dg/team_form_3.f90: New test.
	* gfortran.dg/team_sync_2.f90: New test.

1 files changed, 6 insertions, 1 deletions

diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc
index 62dd38d..276f325 100644
--- a/gcc/fortran/trans-expr.cc
+++ b/gcc/fortran/trans-expr.cc
@@ -9836,7 +9836,12 @@ gfc_trans_subcomponent_assign (tree dest, gfc_component * cm,
 	   && !cm->attr.proc_pointer)
     {
       if (cm->attr.allocatable && expr->expr_type == EXPR_NULL)
- 	gfc_conv_descriptor_data_set (&block, dest, null_pointer_node);
+	{
+	  gfc_conv_descriptor_data_set (&block, dest, null_pointer_node);
+	  if (cm->attr.codimension && flag_coarray == GFC_FCOARRAY_LIB)
+	    gfc_add_modify (&block, gfc_conv_descriptor_token (dest),
+			    null_pointer_node);
+	}
       else if (cm->attr.allocatable || cm->attr.pdt_array)
 	{
 	  tmp = gfc_trans_alloc_subarray_assign (dest, cm, expr);