re PR middle-end/82123 (spurious -Wformat-overflow warning for converted vars)

	PR middle-end/82123
	PR tree-optimization/81592
	PR middle-end/79257
	* gimple-ssa-sprintf.c: Include alloc-pool.h, vr-values.h and
	gimple-ssa-evrp-analyze.h
	(class sprintf_dom_walker): Add after_dom_children member function.
	Add evrp_range_analyzer member.
	(sprintf_dom_walker::before_dom_children): Call into the EVRP
	range analyzer as needed.
	(sprintf_dom_walker::after_dom_children): New member function.

	* gcc.dg/builtin-unreachable-6.c: Turn off VRP.

From-SVN: r257852

gcc/ChangeLog

@@ -3,6 +3,13 @@
 	PR middle-end/82123
 	PR tree-optimization/81592
 	PR middle-end/79257
+	* gimple-ssa-sprintf.c: Include alloc-pool.h, vr-values.h and 
+	gimple-ssa-evrp-analyze.h
+	(class sprintf_dom_walker): Add after_dom_children member function.
+	Add evrp_range_analyzer member.
+	(sprintf_dom_walker::before_dom_children): Call into the EVRP
+	range analyzer as needed.
+	(sprintf_dom_walker::after_dom_children): New member function.
 	* gimple-ssa-evrp-analyze.c (evrp_range_analyzer::enter): Do nothing
 	if not optimizing.
 	(evrp_range_analyzer::record_ranges_from_stmt): Likewise.

gcc/gimple-ssa-sprintf.c

@@ -80,6 +80,9 @@ along with GCC; see the file COPYING3.  If not see
 #include "substring-locations.h"
 #include "diagnostic.h"
 #include "domwalk.h"
+#include "alloc-pool.h"
+#include "vr-values.h"
+#include "gimple-ssa-evrp-analyze.h"
 
 /* The likely worst case value of MB_LEN_MAX for the target, large enough
    for UTF-8.  Ideally, this would be obtained by a target hook if it were
@@ -121,10 +124,12 @@ class sprintf_dom_walker : public dom_walker
   ~sprintf_dom_walker () {}
 
   edge before_dom_children (basic_block) FINAL OVERRIDE;
+  void after_dom_children (basic_block) FINAL OVERRIDE;
   bool handle_gimple_call (gimple_stmt_iterator *);
 
   struct call_info;
   bool compute_format_length (call_info &, format_result *);
+  class evrp_range_analyzer evrp_range_analyzer;
 };
 
 class pass_sprintf_length : public gimple_opt_pass
@@ -3456,7 +3461,7 @@ parse_directive (sprintf_dom_walker::call_info &info,
 
 bool
 sprintf_dom_walker::compute_format_length (call_info &info,
-					    format_result *res)
+					   format_result *res)
 {
   if (dump_file)
     {
@@ -4012,11 +4017,15 @@ sprintf_dom_walker::handle_gimple_call (gimple_stmt_iterator *gsi)
 edge
 sprintf_dom_walker::before_dom_children (basic_block bb)
 {
+  evrp_range_analyzer.enter (bb);
   for (gimple_stmt_iterator si = gsi_start_bb (bb); !gsi_end_p (si); )
     {
       /* Iterate over statements, looking for function calls.  */
       gimple *stmt = gsi_stmt (si);
 
+      /* First record ranges generated by this statement.  */
+      evrp_range_analyzer.record_ranges_from_stmt (stmt, false);
+
       if (is_gimple_call (stmt) && handle_gimple_call (&si))
 	/* If handle_gimple_call returns true, the iterator is
 	   already pointing to the next statement.  */
@@ -4027,6 +4036,12 @@ sprintf_dom_walker::before_dom_children (basic_block bb)
   return NULL;
 }
 
+void
+sprintf_dom_walker::after_dom_children (basic_block bb)
+{
+  evrp_range_analyzer.leave (bb);
+}
+
 /* Execute the pass for function FUN.  */
 
 unsigned int

gcc/testsuite/ChangeLog

+2018-02-20  Jeff Law  <law@redhat.com>
+
+        PR middle-end/82123
+        PR tree-optimization/81592
+        PR middle-end/79257
+	* gcc.dg/builtin-unreachable-6.c: Turn off VRP.
+
 2018-02-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/84488

gcc/testsuite/gcc.dg/builtin-unreachable-6.c

 /* { dg-do compile } */
-/* { dg-options "-O2 -fdump-tree-fab1 -fno-tree-dominator-opts" } */
+/* { dg-options "-O2 -fdump-tree-fab1 -fno-tree-dominator-opts -fno-tree-vrp" } */
 
 void
 foo (int b, int c)