https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93947
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by David Malcolm <dmalc...@gcc.gnu.org>: https://gcc.gnu.org/g:0ba70d1b5ae8df6406a880b2d23e4710b393e8c9 commit r10-6879-g0ba70d1b5ae8df6406a880b2d23e4710b393e8c9 Author: David Malcolm <dmalc...@redhat.com> Date: Wed Feb 26 09:43:57 2020 -0500 analyzer: fix ICE on unreachable calls [PR 93947] PR analyzer/93947 reports an ICE at -O1 when attempting to analyze a call that has been optimized away as unreachable. The root cause is a NULL dereference due to the fndecl having a NULL cgraph_node: the cgraph_node was created by pass_build_cgraph_edges::execute, but was later removed by symbol_table::remove_unreachable_nodes before the analyzer pass. This patch fixes it by checking for NULL before handling the cgraph_node. The reproducer demonstrates a weakness in the analyzer's constraint handling, where region_model::apply_constraints_for_gswitch fails to spot when the cases fully cover the data type, and thus make the default impossible. For now this is xfail-ed in the testcase. gcc/analyzer/ChangeLog: PR analyzer/93947 * region-model.cc (region_model::get_fndecl_for_call): Gracefully fail for fn_decls that don't have a cgraph_node. gcc/testsuite/ChangeLog: PR analyzer/93947 * gcc.dg/analyzer/torture/pr93947.c: New test.
