analyzer: eliminate cast_region::m_original_region

cast_region had its own field m_original_region, rather than
simply using region::m_parent, leading to lots of pointless
special-casing of RK_CAST.

Remove the field and simply use the parent region.

Doing so revealed a bug (seen in gcc.dg/analyzer/taint-alloc-4.c)
where region_model::get_representative_path_var_1's RK_CAST case
was always failing, due to using the "parent region" (actually
that of the original region's parent), rather than the original region;
the patch fixes the bug by removing the distinction.

gcc/analyzer/ChangeLog:
	* call-summary.cc
	(call_summary_replay::convert_region_from_summary_1): Update
	for removal of cast_region::m_original_region.
	* region-model-manager.cc
	(region_model_manager::get_or_create_initial_value): Likewise.
	* region-model.cc (region_model::get_store_value): Likewise.
	* region.cc (region::get_base_region): Likewise.
	(region::descendent_of_p): Likewise.
	(region::maybe_get_frame_region): Likewise.
	(region::get_memory_space): Likewise.
	(region::calc_offset): Likewise.
	(cast_region::accept): Delete.
	(cast_region::dump_to_pp): Update for removal of
	cast_region::m_original_region.
	(cast_region::add_dump_widget_children): Delete.
	* region.h (struct cast_region::key_t): Rename "original_region"
	to "parent".
	(cast_region::cast_region): Likewise.  Update for removal of
	cast_region::m_original_region.
	(cast_region::accept): Delete.
	(cast_region::add_dump_widget_children): Delete.
	(cast_region::get_original_region): Delete.
	(cast_region::m_original_region): Delete.
	* sm-taint.cc (region_model::check_region_for_taint): Remove
	special-casing for RK_CAST.

gcc/testsuite/ChangeLog:
	* gcc.dg/analyzer/taint-alloc-4.c: Update expected result to
	reflect change in message due to
	region_model::get_representative_path_var_1 now handling RK_CAST.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

0 files changed, 0 insertions, 0 deletions