tests: add test cases for label-relative path references

Newly added &{label/path} feature doesn't yet have any tests. Add some.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

tests/.gitignore

@@ -54,6 +54,7 @@ tmp.*
 /property_iterate
 /propname_escapes
 /references
+/relref_merge
 /root_node
 /rw_tree1
 /rw_oom

tests/Makefile.tests

@@ -18,7 +18,7 @@ LIB_TESTS_L = get_mem_rsv \
 	open_pack rw_tree1 rw_oom set_name setprop del_property del_node \
 	appendprop1 appendprop2 propname_escapes \
 	string_escapes references path-references phandle_format \
-	boot-cpuid incbin \
+	boot-cpuid incbin relref_merge \
 	extra-terminating-null \
 	dtbs_equal_ordered \
 	dtb_reverse dtbs_equal_unordered \

tests/path-references.c

@@ -53,7 +53,7 @@ int main(int argc, char *argv[])
 	void *fdt;
 	const char *p;
 	int len, multilen;
-	int n1, n2, n3, n4;
+	int n1, n2, n3, n4, n5;
 
 	test_init(argc, argv);
 	fdt = load_blob_arg(argc, argv);
@@ -89,6 +89,12 @@ int main(int argc, char *argv[])
 	check_ref(fdt, n3, "/foobar/baz");
 	check_ref(fdt, n4, "/foo/baz");
 
+	n5 = fdt_path_offset(fdt, "/bar/baz");
+	if (n5 < 0)
+		FAIL("fdt_path_offset(/bar/baz): %s", fdt_strerror(n5));
+
+	check_ref(fdt, n5, "/bar/baz");
+
 	check_rref(fdt);
 
 	PASS();

tests/path-references.dts

@@ -25,4 +25,13 @@
 			lref = &n3;
 		};
 	};
+	n5: bar {
+		baz {
+		};
+	};
+};
+
+n6: &{n5/baz} {
+	ref = &{n6/};
+	lref = &{n5/baz};
 };

tests/relref_merge.c

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Testcase for label relative child references in dtc
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ * Copyright (C) 2020 Ahmad Fatoum, Pengutronix.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+static void check_exist(void *fdt, const char *path)
+{
+	int sn = fdt_path_offset(fdt, path);
+	if (sn < 0)
+		FAIL("%s expected but not found: %s", path, fdt_strerror(sn));
+}
+
+static void check_doesnt_exist(void *fdt, const char *path)
+{
+	int sn = fdt_path_offset(fdt, path);
+	if (sn >= 0)
+		FAIL("%s found but not expected %d", path, sn);
+}
+
+int main(int argc, char *argv[])
+{
+	void *fdt;
+
+	test_init(argc, argv);
+	fdt = load_blob_arg(argc, argv);
+
+	check_exist(fdt, "/node/subnode1");
+	check_exist(fdt, "/node/keep-me");
+	check_doesnt_exist(fdt, "/node/remove-me");
+
+	check_doesnt_exist(fdt, "/node2");
+	check_doesnt_exist(fdt, "/node/subnode3");
+
+	check_exist(fdt, "/node/subnode4");
+
+	check_exist(fdt, "/node/subnode1/add-me");
+
+	PASS();
+}

tests/relref_merge.dts

@@ -0,0 +1,40 @@
+/dts-v1/;
+
+/ {
+	node_label: node {
+		keep-me {};
+		remove-me {};
+
+		subnode1 {
+			property-inline1;
+			property-inline2;
+			property-inline3;
+		};
+
+		subnode2 {
+			property-inline1;
+		};
+
+		subnode3 {
+			property-inline1;
+		};
+	};
+
+	node2_label: node2 {
+		property-inline1;
+	};
+};
+/omit-if-no-ref/ &{node_label/subnode1};
+/omit-if-no-ref/ &node2_label;
+/delete-node/ &{node_label/subnode3};
+
+&{node_label/} {
+	/delete-node/ remove-me;
+
+	subnode4 { };
+};
+
+label: &{node_label/subnode1} {
+	selfref = &{node_label/subnode1};
+	add-me { };
+};

tests/run_tests.sh

@@ -669,6 +669,9 @@ dtc_tests () {
     tree1_tests dtc_tree1_merge_path.test.dtb test_tree1.dtb
     run_wrap_error_test $DTC -I dts -O dtb -o /dev/null "$SRCDIR/test_label_ref.dts"
 
+    run_dtc_test -I dts -O dtb -o dtc_relref_merge.test.dtb "$SRCDIR/relref_merge.dts"
+    run_test relref_merge dtc_relref_merge.test.dtb
+
     # Check prop/node delete functionality
     run_dtc_test -I dts -O dtb -o dtc_tree1_delete.test.dtb "$SRCDIR/test_tree1_delete.dts"
     tree1_tests dtc_tree1_delete.test.dtb