openmp: Add support for iterators in map clauses (C/C++)

This adds preliminary support for iterators in map clauses within OpenMP
'target' constructs (which includes constructs such as 'target enter data').

Iterators with non-constant loop bounds are not currently supported.

gcc/c/

	* c-parser.cc (c_parser_omp_clause_map): Parse 'iterator' modifier.
	* c-typeck.cc (c_finish_omp_clauses): Finish iterators.  Apply
	iterators to generated clauses.

gcc/cp/

	* parser.cc (cp_parser_omp_clause_map): Parse 'iterator' modifier.
	* semantics.cc (finish_omp_clauses): Finish iterators.  Apply
	iterators to generated clauses.

gcc/

	* gimple-pretty-print.cc (dump_gimple_omp_target): Print expanded
	iterator loops.
	* gimple.cc (gimple_build_omp_target): Add argument for iterator
	loops sequence.  Initialize iterator loops field.
	* gimple.def (GIMPLE_OMP_TARGET): Set GSS symbol to GSS_OMP_TARGET.
	* gimple.h (gomp_target): Set GSS symbol to GSS_OMP_TARGET.  Add extra
	field for iterator loops.
	(gimple_build_omp_target): Add argument for iterator loops sequence.
	(gimple_omp_target_iterator_loops): New.
	(gimple_omp_target_iterator_loops_ptr): New.
	(gimple_omp_target_set_iterator_loops): New.
	* gimplify.cc (find_var_decl): New.
	(copy_omp_iterator): New.
	(remap_omp_iterator_var_1): New.
	(remap_omp_iterator_var): New.
	(remove_unused_omp_iterator_vars): New.
	(struct iterator_loop_info_t): New type.
	(iterator_loop_info_map_t): New type.
	(build_omp_iterators_loops): New.
	(enter_omp_iterator_loop_context_1): New.
	(enter_omp_iterator_loop_context): New.
	(enter_omp_iterator_loop_context): New.
	(exit_omp_iterator_loop_context): New.
	(gimplify_adjust_omp_clauses): Add argument for iterator loop
	sequence.  Gimplify the clause decl and size into the iterator
	loop if iterators are used.
	(gimplify_omp_workshare): Call remove_unused_omp_iterator_vars and
	build_omp_iterators_loops for OpenMP target expressions.  Add
	loop sequence as argument when calling gimplify_adjust_omp_clauses
	and building the Gimple statement.
	* gimplify.h (enter_omp_iterator_loop_context): New prototype.
	(exit_omp_iterator_loop_context): New prototype.
	* gsstruct.def (GSS_OMP_TARGET): New.
	* omp-low.cc (lower_omp_map_iterator_expr): New.
	(lower_omp_map_iterator_size): New.
	(finish_omp_map_iterators): New.
	(lower_omp_target): Add sorry if iterators used with deep mapping.
	Call lower_omp_map_iterator_expr before assigning to sender ref.
	Call lower_omp_map_iterator_size before setting the size.  Insert
	iterator loop sequence before the statements for the target clause.
	* tree-nested.cc (convert_nonlocal_reference_stmt): Walk the iterator
	loop sequence of OpenMP target statements.
	(convert_local_reference_stmt): Likewise.
	(convert_tramp_reference_stmt): Likewise.
	* tree-pretty-print.cc (dump_omp_iterators): Dump extra iterator
	information if present.
	(dump_omp_clause): Call dump_omp_iterators for iterators in map
	clauses.
	* tree.cc (omp_clause_num_ops): Add operand for OMP_CLAUSE_MAP.
	(walk_tree_1): Do not walk last operand of OMP_CLAUSE_MAP.
	* tree.h (OMP_CLAUSE_HAS_ITERATORS): New.
	(OMP_CLAUSE_ITERATORS): New.

gcc/testsuite/

	* c-c++-common/gomp/map-6.c (foo): Amend expected error message.
	* c-c++-common/gomp/target-map-iterators-1.c: New.
	* c-c++-common/gomp/target-map-iterators-2.c: New.
	* c-c++-common/gomp/target-map-iterators-3.c: New.
	* c-c++-common/gomp/target-map-iterators-4.c: New.

libgomp/

	* target.c (kind_to_name): New.
	(gomp_merge_iterator_maps): New.
	(gomp_map_vars_internal): Call gomp_merge_iterator_maps.  Copy
	address of only the first iteration to target vars.  Free allocated
	variables.
	* testsuite/libgomp.c-c++-common/target-map-iterators-1.c: New.
	* testsuite/libgomp.c-c++-common/target-map-iterators-2.c: New.
	* testsuite/libgomp.c-c++-common/target-map-iterators-3.c: New.

Co-authored-by: Andrew Stubbs <ams@baylibre.com>

0 files changed, 0 insertions, 0 deletions