https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103546
--- 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:d564a83d14252d7db01381f71900b7a68357803b commit r12-6323-gd564a83d14252d7db01381f71900b7a68357803b Author: David Malcolm <dmalc...@redhat.com> Date: Thu Jan 6 11:39:54 2022 -0500 analyzer: make use of may_be_aliased in alias detection [PR103546] Whilst debugging PR analyzer/103546 (false +ve in flex-generated lexers) I noticed that the analyzer was considering that writes through symbolic pointers could be treated as clobbering static globals such as: static YY_BUFFER_STATE * yy_buffer_stack = NULL; even for such variables that never have their address taken. This patch fixes this issue at least, so that the analyzer can preserve knowledge of such globals on code paths with writes through symbolic pointers. It does not fix the false +ve in the lexer code. gcc/analyzer/ChangeLog: PR analyzer/103546 * store.cc (store::eval_alias_1): Refactor handling of decl regions, adding a test for may_be_aliased, rejecting those for which it returns false. gcc/testsuite/ChangeLog: PR analyzer/103546 * gcc.dg/analyzer/aliasing-3.c: New test. Signed-off-by: David Malcolm <dmalc...@redhat.com>
