X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Falignof%2Ftest%2Frun.c;fp=ccan%2Falignof%2Ftest%2Frun.c;h=f76fb6691c73c9692cb1a767723b0f9a63e33a72;hb=650c775ff00cccd03fc84e7789a03c51d9839004;hp=0000000000000000000000000000000000000000;hpb=c8acddea39d222312102952e91c32cfe4dd2cea0;p=ccan

diff --git a/ccan/alignof/test/run.c b/ccan/alignof/test/run.c
new file mode 100644
index 00000000..f76fb669
--- /dev/null
+++ b/ccan/alignof/test/run.c
@@ -0,0 +1,62 @@
+#include <stdlib.h>
+#include <stddef.h>
+#include <tap/tap.h>
+#include "alignof/alignof.h"
+
+/* Alignment is remarkably difficult to test.  The rules may be more
+ * complex than ALIGNOF() can know: eg. on i386 __alignof__(double) == 8, but
+ * __alignof__(struct containing double) == 4.
+ *
+ * Technically, we can only test that we give *at least* the alignment which
+ * naturally occurs, and that accesses work.
+ *
+ * For the moment, we work around double. */
+struct lots_of_types
+{
+	char c;
+	short s;
+	char c2;
+	int i;
+	char c3;
+	float f;
+	char c4;
+	double d;
+	char c5;
+};
+
+int main(int argc, char *argv[])
+{
+	struct lots_of_types lots_of_types, *lp = malloc(sizeof(*lp));
+	char c;
+	short s;
+	char c2;
+	int i;
+	char c3;
+	float f;
+	char c4;
+	double d;
+
+	/* Make sure we use all the variables. */
+	c = 0;
+	c2 = c3 = c4 = c;
+
+	plan_tests(15);
+	ok1((unsigned long)&c % ALIGNOF(char) == 0);
+	ok1((unsigned long)&s % ALIGNOF(short) == 0);
+	ok1((unsigned long)&i % ALIGNOF(int) == 0);
+	ok1((unsigned long)&f % ALIGNOF(float) == 0);
+	ok1((unsigned long)&d % ALIGNOF(double) == 0);
+
+	ok1((unsigned long)&lots_of_types.c % ALIGNOF(char) == 0);
+	ok1((unsigned long)&lots_of_types.s % ALIGNOF(short) == 0);
+	ok1((unsigned long)&lots_of_types.i % ALIGNOF(int) == 0);
+	ok1((unsigned long)&lots_of_types.f % ALIGNOF(float) == 0);
+	ok1(offsetof(struct lots_of_types, d) % ALIGNOF(double) == 0);
+
+	ok1((unsigned long)&lp->c % ALIGNOF(char) == 0);
+	ok1((unsigned long)&lp->s % ALIGNOF(short) == 0);
+	ok1((unsigned long)&lp->i % ALIGNOF(int) == 0);
+	ok1((unsigned long)&lp->f % ALIGNOF(float) == 0);
+	ok1((unsigned long)&lp->d % ALIGNOF(double) == 0);
+	exit(exit_status());
+}