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

4 files changed, 70 insertions, 0 deletions

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 745ed0dc..b4e0479 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+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
diff --git a/gcc/testsuite/gcc.dg/torture/pr57147-1.c b/gcc/testsuite/gcc.dg/torture/pr57147-1.c
new file mode 100644
index 0000000..e5ad544
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr57147-1.c
@@ -0,0 +1,21 @@
+/* { 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" } } */
diff --git a/gcc/testsuite/gcc.dg/torture/pr57147-2.c b/gcc/testsuite/gcc.dg/torture/pr57147-2.c
new file mode 100644
index 0000000..521d126
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr57147-2.c
@@ -0,0 +1,22 @@
+/* { 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" } } */
diff --git a/gcc/testsuite/gcc.dg/torture/pr57147-3.c b/gcc/testsuite/gcc.dg/torture/pr57147-3.c
new file mode 100644
index 0000000..c64e5ad
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr57147-3.c
@@ -0,0 +1,20 @@
+/* { 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 (;;)
+      ;
+}