[PATCH 13/15] Add selftests to tree.c

[David Malcolm <dmalcolm at redhat dot com>]

Jeff approved an earlier version of this (as
unittests/test-tree.c):
 https://gcc.gnu.org/ml/gcc-patches/2015-10/msg03303.html
> OK if/when prereqs are approved. Minor twiddling if we end up
> moving it elsewhere or standardizing/reducing header files is
> pre-approved.

This version puts the tests at the end of tree.c.

gcc/ChangeLog:
	* tree.c: Include "selftest.h".
	(tree_test, integer_constants): New selftest.
	(tree_test, identifiers): New selftest.
	(tree_test, labels): New selftest.
---
 gcc/tree.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/gcc/tree.c b/gcc/tree.c
index d5a71a3..6ed1914 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -61,6 +61,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "builtins.h"
 #include "print-tree.h"
 #include "ipa-utils.h"
+#include "selftest.h"
 
 /* Tree code classes.  */
 
@@ -13951,4 +13952,50 @@ combined_fn_name (combined_fn fn)
     return internal_fn_name (as_internal_fn (fn));
 }
 
+#if CHECKING_P
+
+namespace {
+
+/* Verify that integer constants are sane.  */
+
+TEST (tree_test, integer_constants)
+{
+  ASSERT_TRUE (integer_type_node != NULL);
+  EXPECT_TRUE (build_int_cst (integer_type_node, 0) != NULL);
+
+  tree type = integer_type_node;
+
+  tree zero = build_zero_cst (type);
+  EXPECT_EQ (INTEGER_CST, TREE_CODE (zero));
+  EXPECT_EQ (type, TREE_TYPE (zero));
+
+  tree one = build_int_cst (type, 1);
+  EXPECT_EQ (INTEGER_CST, TREE_CODE (one));
+  EXPECT_EQ (type, TREE_TYPE (zero));
+}
+
+/* Verify identifiers.  */
+
+TEST (tree_test, identifiers)
+{
+  tree identifier = get_identifier ("foo");
+  EXPECT_EQ (3, IDENTIFIER_LENGTH (identifier));
+  EXPECT_STREQ ("foo", IDENTIFIER_POINTER (identifier));
+}
+
+/* Verify LABEL_DECL.  */
+
+TEST (tree_test, labels)
+{
+  tree identifier = get_identifier ("err");
+  tree label_decl = build_decl (UNKNOWN_LOCATION, LABEL_DECL,
+				identifier, void_type_node);
+  EXPECT_EQ (-1, LABEL_DECL_UID (label_decl));
+  EXPECT_FALSE (FORCED_LABEL (label_decl));
+}
+
+}  // anon namespace
+
+#endif /* CHECKING_P */
+
 #include "gt-tree.h"
-- 
1.8.5.3