1 files changed, 25 insertions, 0 deletions
diff --git a/lib/dfsan/lit_tests/fncall.c b/lib/dfsan/lit_tests/fncall.c
new file mode 100644
index 000000000..7d4706f70
--- /dev/null
+++ b/lib/dfsan/lit_tests/fncall.c
@@ -0,0 +1,25 @@
+// RUN: %clang_dfsan -m64 %s -o %t && %t
+
+// Tests that labels are propagated through function calls.
+
+#include <sanitizer/dfsan_interface.h>
+#include <assert.h>
+
+int f(int x) {
+  int j = 2;
+  dfsan_label j_label = dfsan_create_label("j", 0);
+  dfsan_set_label(j_label, &j, sizeof(j));
+  return x + j;
+}
+
+int main(void) {
+  int i = 1;
+  dfsan_label i_label = dfsan_create_label("i", 0);
+  dfsan_set_label(i_label, &i, sizeof(i));
+
+  dfsan_label ij_label = dfsan_get_label(f(i));
+  assert(dfsan_has_label(ij_label, i_label));
+  assert(dfsan_has_label_with_desc(ij_label, "j"));
+
+  return 0;
+}