lib/tests: Add igt_assert_*() self-tests

Make sure our igt_assert variants are doing something that looks vaguely
like the right thing.

Signed-off-by: Daniel Stone <daniels@collabora.com>

lib/tests/.gitignore

@@ -1,4 +1,5 @@
 # Please keep sorted alphabetically
+igt_assert
 igt_fork_helper
 igt_invalid_subtest_name
 igt_list_only

lib/tests/Makefile.sources

@@ -10,6 +10,7 @@ check_PROGRAMS = \
 	igt_timeout \
 	igt_invalid_subtest_name \
 	igt_segfault \
+	igt_assert \
 	$(NULL)
 
 check_SCRIPTS = \

lib/tests/igt_assert.c

@@ -0,0 +1,173 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <float.h>
+#include <limits.h>
+#include <math.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "igt_core.h"
+
+/*
+ * We need to hide assert from the cocci igt test refactor spatch.
+ *
+ * IMPORTANT: Test infrastructure tests are the only valid places where using
+ * assert is allowed.
+ */
+#define internal_assert assert
+
+char test[] = "test";
+char *argv_run[] = { test };
+void (*test_to_run)(void) = NULL;
+
+/*
+ * A really tedious way of making sure we execute every negative test, and that
+ * they all really fail.
+ */
+#define CHECK_NEG(x) { \
+	igt_subtest_f("XFAIL_simple_%d", __LINE__) { \
+		(*exec_before)++; \
+		x; \
+		raise(SIGBUS); \
+	} \
+	exec_total++; \
+}
+
+static int do_fork(void)
+{
+	int pid, status;
+	int argc;
+
+	switch (pid = fork()) {
+	case -1:
+		internal_assert(0);
+	case 0:
+		argc = 1;
+		igt_simple_init(argc, argv_run);
+		test_to_run();
+		igt_exit();
+	default:
+		while (waitpid(pid, &status, 0) == -1 &&
+		       errno == EINTR)
+			;
+
+		if(WIFSIGNALED(status))
+			return WTERMSIG(status) + 128;
+
+		return WEXITSTATUS(status);
+	}
+}
+
+static void test_cmpint_negative(void)
+{
+	int *exec_before = calloc(1, sizeof(int));
+	int exec_total = 0;
+
+	CHECK_NEG(igt_assert_eq(INT_MIN, INT_MAX));
+
+	CHECK_NEG(igt_assert_eq_u32(0xfffffffeUL, 0xffffffffUL));
+
+	CHECK_NEG(igt_assert_eq_u64(0xfffeffffffffffffULL, 0xffffffffffffffffULL));
+	CHECK_NEG(igt_assert_eq_u64(0xfffffffeffffffffULL, 0xffffffffffffffffULL));
+	CHECK_NEG(igt_assert_eq_u64(0xfffffffffffeffffULL, 0xffffffffffffffffULL));
+
+	CHECK_NEG(igt_assert_eq_double(0.0, DBL_MAX));
+	CHECK_NEG(igt_assert_eq_double(DBL_MAX, nexttoward(DBL_MAX, 0.0)));
+
+	if (*exec_before != exec_total)
+		raise(SIGSEGV);
+}
+
+static void test_cmpint(void)
+{
+	igt_assert_eq(0, 0);
+	igt_assert_eq(INT_MAX, INT_MAX);
+	igt_assert_eq(INT_MAX, INT_MAX);
+	igt_assert_neq(INT_MIN, INT_MAX);
+
+	igt_assert_eq_u32(0, 0);
+	igt_assert_eq_u32(0xffffffffUL, 0xffffffffUL);
+	igt_assert_neq_u32(0xfffffffeUL, 0xffffffffUL);
+
+	igt_assert_eq_u64(0, 0);
+	igt_assert_eq_u64(0xffffffffffffffffULL, 0xffffffffffffffffULL);
+	igt_assert_neq_u64(0xfffffffffffffffeULL, 0xffffffffffffffffULL);
+
+	igt_assert_eq_double(0.0, 0.0);
+	igt_assert_eq_double(DBL_MAX, DBL_MAX);
+	igt_assert_neq_double(0.0, DBL_MAX);
+}
+
+static void test_fd_negative(void)
+{
+	int *exec_before = calloc(1, sizeof(int));
+	int exec_total = 0;
+
+	CHECK_NEG(igt_assert_fd(-1));
+	CHECK_NEG(igt_assert_fd(INT_MIN));
+
+	if (*exec_before != exec_total)
+		raise(SIGSEGV);
+}
+
+static void test_fd(void)
+{
+	igt_assert_fd(0);
+	igt_assert_fd(1);
+	igt_assert_fd(INT_MAX);
+}
+
+igt_main
+{
+	int ret;
+
+	igt_subtest("igt_cmpint")
+		test_cmpint();
+
+	/*
+	 * The awkward subtest dance here is because we really want to use
+	 * subtests in our negative tests, to ensure we actually execute all
+	 * the subtests. But we can't begin a subtest within a subtest, and
+	 * we inherit the state from the parent, so ...
+	 */
+	test_to_run = test_cmpint_negative;
+	ret = do_fork();
+	igt_subtest("igt_cmpint_negative")
+		internal_assert(ret == IGT_EXIT_FAILURE);
+
+	igt_subtest("igt_assert_fd")
+		test_fd();
+
+	test_to_run = test_fd_negative;
+	ret = do_fork();
+	igt_subtest("igt_assert_fd_negative")
+		internal_assert(ret == IGT_EXIT_FAILURE);
+}