diff --git a/gcc/testsuite/g++.dg/pr107803.C b/gcc/testsuite/g++.dg/pr107803.C new file mode 100644 index 0000000000000000000000000000000000000000..f814e968b69bb6bab832ca00cf0bce78d8956220 --- /dev/null +++ b/gcc/testsuite/g++.dg/pr107803.C @@ -0,0 +1,19 @@ +// { dg-do compile } +// { dg-options "-O -fno-tree-dominator-opts -fno-tree-fre -Wmaybe-uninitialized" } + +void printf(...); +void __sigsetjmp_cancel() __attribute__((__returns_twice__)); +int z, main_ret; +void func(void *) {} + +int +main() +{ + int x; + void (*__cancel_routine)(void *)(func); + __sigsetjmp_cancel(); + __cancel_routine(0); + if (main_ret) + x = z; + printf(x); +} diff --git a/gcc/tree-ssa-propagate.cc b/gcc/tree-ssa-propagate.cc index 9dc4bfd85bf514574a357a692f09e3606aefa12c..d8b0aed4564298822f40819d0930fa16465f2e69 100644 --- a/gcc/tree-ssa-propagate.cc +++ b/gcc/tree-ssa-propagate.cc @@ -671,12 +671,14 @@ public: stmts_to_remove.create (0); stmts_to_fixup.create (0); need_eh_cleanup = BITMAP_ALLOC (NULL); + need_ab_cleanup = BITMAP_ALLOC (NULL); } ~substitute_and_fold_dom_walker () { stmts_to_remove.release (); stmts_to_fixup.release (); BITMAP_FREE (need_eh_cleanup); + BITMAP_FREE (need_ab_cleanup); } edge before_dom_children (basic_block) final override; @@ -689,6 +691,7 @@ public: vec<gimple *> stmts_to_remove; vec<gimple *> stmts_to_fixup; bitmap need_eh_cleanup; + bitmap need_ab_cleanup; class substitute_and_fold_engine *substitute_and_fold_engine; @@ -838,8 +841,13 @@ substitute_and_fold_dom_walker::before_dom_children (basic_block bb) folded. */ did_replace = false; gimple *old_stmt = stmt; - bool was_noreturn = (is_gimple_call (stmt) - && gimple_call_noreturn_p (stmt)); + bool was_noreturn = false; + bool can_make_abnormal_goto = false; + if (is_gimple_call (stmt)) + { + was_noreturn = gimple_call_noreturn_p (stmt); + can_make_abnormal_goto = stmt_can_make_abnormal_goto (stmt); + } /* Replace real uses in the statement. */ did_replace |= substitute_and_fold_engine->replace_uses_in (stmt); @@ -905,6 +913,12 @@ substitute_and_fold_dom_walker::before_dom_children (basic_block bb) if (maybe_clean_or_replace_eh_stmt (old_stmt, stmt)) bitmap_set_bit (need_eh_cleanup, bb->index); + /* If we turned a call with possible abnormal control transfer + into one that doesn't, remove abnormal edges. */ + if (can_make_abnormal_goto + && !stmt_can_make_abnormal_goto (stmt)) + bitmap_set_bit (need_ab_cleanup, bb->index); + /* If we turned a not noreturn call into a noreturn one schedule it for fixup. */ if (!was_noreturn @@ -1012,6 +1026,8 @@ substitute_and_fold_engine::substitute_and_fold (basic_block block) if (!bitmap_empty_p (walker.need_eh_cleanup)) gimple_purge_all_dead_eh_edges (walker.need_eh_cleanup); + if (!bitmap_empty_p (walker.need_ab_cleanup)) + gimple_purge_all_dead_abnormal_call_edges (walker.need_ab_cleanup); /* Fixup stmts that became noreturn calls. This may require splitting blocks and thus isn't possible during the dominator walk. Do this