vr-values.c (gimple_stmt_nonzero_p): Abstract common code to...

        * vr-values.c (gimple_stmt_nonzero_p): Abstract common code to...
        * gimple.c (gimple_call_nonnull_result_p): ...here...
        (gimple_call_nonnull_arg): ...and here.
        * gimple.h (gimple_call_nonnull_result_p): New.
        (gimple_call_nonnull_arg): New.

From-SVN: r262557

1 files changed, 51 insertions, 0 deletions

diff --git a/gcc/gimple.c b/gcc/gimple.c
index afdf583..8d56a96 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -1548,6 +1548,57 @@ gimple_call_return_flags (const gcall *stmt)
 }
 
 
+/* Return true if call STMT is known to return a non-zero result.  */
+
+bool
+gimple_call_nonnull_result_p (gcall *call)
+{
+  tree fndecl = gimple_call_fndecl (call);
+  if (!fndecl)
+    return false;
+  if (flag_delete_null_pointer_checks && !flag_check_new
+      && DECL_IS_OPERATOR_NEW (fndecl)
+      && !TREE_NOTHROW (fndecl))
+    return true;
+
+  /* References are always non-NULL.  */
+  if (flag_delete_null_pointer_checks
+      && TREE_CODE (TREE_TYPE (fndecl)) == REFERENCE_TYPE)
+    return true;
+
+  if (flag_delete_null_pointer_checks
+      && lookup_attribute ("returns_nonnull",
+			   TYPE_ATTRIBUTES (gimple_call_fntype (call))))
+    return true;
+  return gimple_alloca_call_p (call);
+}
+
+
+/* If CALL returns a non-null result in an argument, return that arg.  */
+
+tree
+gimple_call_nonnull_arg (gcall *call)
+{
+  tree fndecl = gimple_call_fndecl (call);
+  if (!fndecl)
+    return NULL_TREE;
+
+  unsigned rf = gimple_call_return_flags (call);
+  if (rf & ERF_RETURNS_ARG)
+    {
+      unsigned argnum = rf & ERF_RETURN_ARG_MASK;
+      if (argnum < gimple_call_num_args (call))
+	{
+	  tree arg = gimple_call_arg (call, argnum);
+	  if (SSA_VAR_P (arg)
+	      && infer_nonnull_range_by_attribute (call, arg))
+	    return arg;
+	}
+    }
+  return NULL_TREE;
+}
+
+
 /* Return true if GS is a copy assignment.  */
 
 bool