re PR middle-end/57147 (setjmp call and if body wrongly elided (function runs off early end))

2013-05-06  Richard Biener  <rguenther@suse.de>

	PR middle-end/57147
	* tree-cfg.c (gimple_purge_dead_abnormal_call_edges): If
	the edge is also fallthru, preserve it and just clear the
	abnormal flag.
	* tree-cfgcleanup.c (remove_fallthru_edge): If the edge is
	also complex, preserve that and just clear the fallthru flag.
	* tree-inline.c (update_ssa_across_abnormal_edges): Also
	update virtual operands.

	* gcc.dg/torture/pr57147-1.c: New testcase.
	* gcc.dg/torture/pr57147-2.c: Likewise.
	* gcc.dg/torture/pr57147-3.c: Likewise.

From-SVN: r198625

gcc/ChangeLog

+2013-05-06  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/57147
+	* tree-cfg.c (gimple_purge_dead_abnormal_call_edges): If
+	the edge is also fallthru, preserve it and just clear the
+	abnormal flag.
+	* tree-cfgcleanup.c (remove_fallthru_edge): If the edge is
+	also complex, preserve that and just clear the fallthru flag.
+	* tree-inline.c (update_ssa_across_abnormal_edges): Also
+	update virtual operands.
+
 2013-05-06  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/linux.h (DEFAULT_ASM_ENDIAN): Define.

gcc/testsuite/ChangeLog

+2013-05-06  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/57147
+	* gcc.dg/torture/pr57147-1.c: New testcase.
+	* gcc.dg/torture/pr57147-2.c: Likewise.
+	* gcc.dg/torture/pr57147-3.c: Likewise.
+
 2013-05-06  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	PR target/55303

gcc/testsuite/gcc.dg/torture/pr57147-1.c

+/* { dg-do compile } */
+/* { dg-options "-fdump-tree-optimized" } */
+/* { dg-skip-if "" { *-*-* } { "-fno-fat-lto-objects" } { "" } } */
+
+struct __jmp_buf_tag {};
+typedef struct __jmp_buf_tag jmp_buf[1];
+extern int _setjmp (struct __jmp_buf_tag __env[1]);
+
+jmp_buf g_return_jmp_buf;
+
+void SetNaClSwitchExpectations (void)
+{
+}
+void TestSyscall(void)
+{
+  SetNaClSwitchExpectations();
+  _setjmp (g_return_jmp_buf);
+}
+
+/* { dg-final { scan-tree-dump-not "builtin_unreachable" "optimized" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */

gcc/testsuite/gcc.dg/torture/pr57147-2.c

+/* { dg-do compile } */
+/* { dg-options "-fdump-tree-optimized" } */
+/* { dg-skip-if "" { *-*-* } { "-fno-fat-lto-objects" } { "" } } */
+
+struct __jmp_buf_tag {};
+typedef struct __jmp_buf_tag jmp_buf[1];
+extern int _setjmp (struct __jmp_buf_tag __env[1]);
+
+jmp_buf g_return_jmp_buf;
+
+void SetNaClSwitchExpectations (void)
+{
+  __builtin_longjmp (g_return_jmp_buf, 1);
+}
+void TestSyscall(void)
+{
+  SetNaClSwitchExpectations();
+  _setjmp (g_return_jmp_buf);
+}
+
+/* { dg-final { scan-tree-dump "setjmp" "optimized" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */

gcc/testsuite/gcc.dg/torture/pr57147-3.c

+/* { dg-do compile } */
+
+typedef char * ptr_t;
+struct __jmp_buf_tag   {
+};
+typedef struct __jmp_buf_tag sigjmp_buf[1];
+sigjmp_buf GC_jmp_buf;
+void GC_fault_handler(int sig)
+{
+}
+void GC_setup_temporary_fault_handler()     {
+    GC_set_and_save_fault_handler(GC_fault_handler);
+}
+ptr_t GC_find_limit(ptr_t p)
+{
+  GC_setup_temporary_fault_handler();
+  if (__sigsetjmp (GC_jmp_buf, 1) == 0)
+    for (;;)
+      ;
+}

gcc/tree-cfg.c

@@ -7628,7 +7628,10 @@ gimple_purge_dead_abnormal_call_edges (basic_block bb)
     {
       if (e->flags & EDGE_ABNORMAL)
 	{
-	  remove_edge_and_dominated_blocks (e);
+	  if (e->flags & EDGE_FALLTHRU)
+	    e->flags &= ~EDGE_ABNORMAL;
+	  else
+	    remove_edge_and_dominated_blocks (e);
 	  changed = true;
 	}
       else

gcc/tree-cfgcleanup.c

@@ -57,7 +57,10 @@ remove_fallthru_edge (vec<edge, va_gc> *ev)
   FOR_EACH_EDGE (e, ei, ev)
     if ((e->flags & EDGE_FALLTHRU) != 0)
       {
-	remove_edge_and_dominated_blocks (e);
+	if (e->flags & EDGE_COMPLEX)
+	  e->flags &= ~EDGE_FALLTHRU;
+	else
+	  remove_edge_and_dominated_blocks (e);
 	return true;
       }
   return false;

gcc/tree-inline.c

@@ -1841,14 +1841,8 @@ update_ssa_across_abnormal_edges (basic_block bb, basic_block ret_bb,
 	    gcc_assert ((e->flags & EDGE_EH)
 			|| SSA_NAME_OCCURS_IN_ABNORMAL_PHI (PHI_RESULT (phi)));
 
-	    if (virtual_operand_p (PHI_RESULT (phi)))
-	      {
-		mark_virtual_operands_for_renaming (cfun);
-		continue;
-	      }
-
 	    re = find_edge (ret_bb, e->dest);
-	    gcc_assert (re);
+	    gcc_checking_assert (re);
 	    gcc_assert ((re->flags & (EDGE_EH | EDGE_ABNORMAL))
 			== (e->flags & (EDGE_EH | EDGE_ABNORMAL)));