sanity check ic target

From-SVN: r172276

gcc/ChangeLog

+2011-04-11  Xinliang David Li  <davidxl@google.com>
+
+	* value-profile.c (check_ic_target): New function.
+	(gimple_ic_transform): Sanity check indirect call target.
+	* gimple-low.c (gimple_check_call_args): Interface change.
+	(gimple_check_call_matching_types): New function.
+	* tree-inline.c (tree_can_inline_p): Call new function.
 
 2011-04-11  Basile Starynkevitch  <basile@starynkevitch.net>
 

gcc/gimple-low.c

@@ -208,20 +208,20 @@ struct gimple_opt_pass pass_lower_cf =
 };
 
 
+
 /* Verify if the type of the argument matches that of the function
    declaration.  If we cannot verify this or there is a mismatch,
    return false.  */
 
-bool
-gimple_check_call_args (gimple stmt)
+static bool
+gimple_check_call_args (gimple stmt, tree fndecl)
 {
-  tree fndecl, parms, p;
+  tree parms, p;
   unsigned int i, nargs;
 
   nargs = gimple_call_num_args (stmt);
 
   /* Get argument types for verification.  */
-  fndecl = gimple_call_fndecl (stmt);
   if (fndecl)
     parms = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
   else
@@ -272,6 +272,25 @@ gimple_check_call_args (gimple stmt)
   return true;
 }
 
+/* Verify if the type of the argument and lhs of CALL_STMT matches
+   that of the function declaration CALLEE.
+   If we cannot verify this or there is a mismatch, return false.  */
+
+bool
+gimple_check_call_matching_types (gimple call_stmt, tree callee)
+{
+  tree lhs;
+
+  if ((DECL_RESULT (callee)
+       && !DECL_BY_REFERENCE (DECL_RESULT (callee))
+       && (lhs = gimple_call_lhs (call_stmt)) != NULL_TREE
+       && !useless_type_conversion_p (TREE_TYPE (DECL_RESULT (callee)),
+                                      TREE_TYPE (lhs))
+       && !fold_convertible_p (TREE_TYPE (DECL_RESULT (callee)), lhs))
+      || !gimple_check_call_args (call_stmt, callee))
+    return false;
+  return true;
+}
 
 /* Lower sequence SEQ.  Unlike gimplification the statements are not relowered
    when they are changed -- if this has to be done, the lowering routine must

gcc/tree-flow.h

@@ -515,7 +515,7 @@ extern void record_vars_into (tree, tree);
 extern void record_vars (tree);
 extern bool gimple_seq_may_fallthru (gimple_seq);
 extern bool gimple_stmt_may_fallthru (gimple);
-extern bool gimple_check_call_args (gimple);
+extern bool gimple_check_call_matching_types (gimple, tree);
 
 
 /* In tree-ssa.c  */

gcc/tree-inline.c

@@ -5326,7 +5326,7 @@ tree_can_inline_p (struct cgraph_edge *e)
 	return false;
     }
 #endif
-  tree caller, callee, lhs;
+  tree caller, callee;
 
   caller = e->caller->decl;
   callee = e->callee->decl;
@@ -5353,13 +5353,7 @@ tree_can_inline_p (struct cgraph_edge *e)
   /* Do not inline calls where we cannot triviall work around mismatches
      in argument or return types.  */
   if (e->call_stmt
-      && ((DECL_RESULT (callee)
-	   && !DECL_BY_REFERENCE (DECL_RESULT (callee))
-	   && (lhs = gimple_call_lhs (e->call_stmt)) != NULL_TREE
-	   && !useless_type_conversion_p (TREE_TYPE (DECL_RESULT (callee)),
-					  TREE_TYPE (lhs))
-	   && !fold_convertible_p (TREE_TYPE (DECL_RESULT (callee)), lhs))
-	  || !gimple_check_call_args (e->call_stmt)))
+      && !gimple_check_call_matching_types (e->call_stmt, callee))
     {
       e->inline_failed = CIF_MISMATCHED_ARGUMENTS;
       if (e->call_stmt)

gcc/value-prof.c

@@ -1090,6 +1090,25 @@ find_func_by_pid (int	pid)
   return pid_map [pid];
 }
 
+/* Perform sanity check on the indirect call target. Due to race conditions,
+   false function target may be attributed to an indirect call site. If the
+   call expression type mismatches with the target function's type, expand_call
+   may ICE. Here we only do very minimal sanity check just to make compiler happy.
+   Returns true if TARGET is considered ok for call CALL_STMT.  */
+
+static bool
+check_ic_target (gimple call_stmt, struct cgraph_node *target)
+{
+   location_t locus;
+   if (gimple_check_call_matching_types (call_stmt, target->decl))
+     return true;
+
+   locus =  gimple_location (call_stmt);
+   inform (locus, "Skipping target %s with mismatching types for icall ",
+           cgraph_node_name (target));
+   return false;
+}
+
 /* Do transformation
 
   if (actual_callee_address == address_of_most_common_function/method)
@@ -1268,6 +1287,9 @@ gimple_ic_transform (gimple stmt)
   if (direct_call == NULL)
     return false;
 
+  if (!check_ic_target (stmt, direct_call))
+    return false;
+
   modify = gimple_ic (stmt, direct_call, prob, count, all);
 
   if (dump_file)
@@ -1748,4 +1770,3 @@ gimple_find_values_to_profile (histogram_values *values)
         }
     }
 }
-