re PR middle-end/78901 (ICE: verify_gimple failed (error: statement marked for throw in middle of block))

PR middle-end/78901
	* gimple-ssa-sprintf.c (try_substitute_return_value): Don't change
	possibly throwing calls.

	* g++.dg/opt/pr78901.C: New test.

From-SVN: r244013

gcc/ChangeLog

@@ -1,5 +1,9 @@
 2017-01-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/78901
+	* gimple-ssa-sprintf.c (try_substitute_return_value): Don't change
+	possibly throwing calls.
+
 	* genmatch.c (dt_node::gen_kids_1): If generic_exprs include SSA_NAME
 	and exprs_len || fns_len, emit the code for SSA_NAME next to the exprs
 	and fns handling, rather than in a separate case SSA_NAME.

gcc/gimple-ssa-sprintf.c

@@ -2696,9 +2696,15 @@ try_substitute_return_value (gimple_stmt_iterator *gsi,
      the output overflows the destination object (but leave it enabled
      when the function is bounded because then the behavior is well-
      defined).  */
-  if (lhs && res.bounded && res.under4k
+  if (lhs
+      && res.bounded
+      && res.under4k
       && (info.bounded || res.number_chars <= info.objsize)
-      && res.number_chars - 1 <= target_int_max ())
+      && res.number_chars - 1 <= target_int_max ()
+      /* Not prepared to handle possibly throwing calls here; they shouldn't
+	 appear in non-artificial testcases, except when the __*_chk routines
+	 are badly declared.  */
+      && !stmt_ends_bb_p (info.callstmt))
     {
       tree cst = build_int_cst (integer_type_node, res.number_chars - 1);
 

gcc/testsuite/ChangeLog

@@ -1,10 +1,14 @@
+2017-01-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/78901
+	* g++.dg/opt/pr78901.C: New test.
+
 2017-01-03  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	PR fortran/78534
 	PR fortran/66310
 	* gfortran.dg/dependency_49.f90: Change scan-tree-dump-times
-          due to gfc_trans_string_copy change to avoid
+	due to gfc_trans_string_copy change to avoid -Wstringop-overflow.
-          -Wstringop-overflow.
 	* gfortran.dg/repeat_4.f90: Use integers of kind C_SIZE_T.
 	* gfortran.dg/repeat_7.f90: New test for PR 66310.
 	* gfortran.dg/scan_2.f90: Handle potential cast in assignment.

gcc/testsuite/g++.dg/opt/pr78901.C

@@ -0,0 +1,18 @@
+// PR middle-end/78901
+// { dg-do compile }
+// { dg-options "-O2 -Wno-stringop-overflow" }
+
+extern "C" int __snprintf_chk (char *, __SIZE_TYPE__, int, __SIZE_TYPE__, const char *, ...);
+
+int
+foo (char *c)
+{
+  try
+    {
+      return __snprintf_chk (c, 64, 0, 32, "%s", "abcdefghijklmnopq");
+    }
+  catch (...)
+    {
+      return -1;
+    }
+}