1 files changed, 47 insertions, 0 deletions
diff --git a/lib/asan/lit_tests/TestCases/contiguous_container.cc b/lib/asan/lit_tests/TestCases/contiguous_container.cc
new file mode 100644
index 000000000000..aa97592c7bb9
--- /dev/null
+++ b/lib/asan/lit_tests/TestCases/contiguous_container.cc
@@ -0,0 +1,47 @@
+// RUN: %clangxx_asan -O %s -o %t && %t
+//
+// Test __sanitizer_annotate_contiguous_container.
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+extern "C" {
+void __sanitizer_annotate_contiguous_container(void *beg, void *end,
+                                               void *old_mid, void *new_mid);
+bool __asan_address_is_poisoned(void *addr);
+}  // extern "C"
+
+void TestContainer(size_t capacity) {
+  char *beg = new char[capacity];
+  char *end = beg + capacity;
+  char *mid = beg + capacity;
+  char *old_mid = 0;
+  unsigned seed = 0;
+
+  for (int i = 0; i < 10000; i++) {
+    size_t size = rand_r(&seed) % (capacity + 1);
+    assert(size <= capacity);
+    old_mid = mid;
+    mid = beg + size;
+    __sanitizer_annotate_contiguous_container(beg, end, old_mid, mid);
+
+    for (size_t idx = 0; idx < size; idx++)
+        assert(!__asan_address_is_poisoned(beg + idx));
+    for (size_t idx = size; idx < capacity; idx++)
+        assert(__asan_address_is_poisoned(beg + idx));
+  }
+
+  // Don't forget to unpoison the whole thing before destroing/reallocating.
+  __sanitizer_annotate_contiguous_container(beg, end, mid, end);
+  for (size_t idx = 0; idx < capacity; idx++)
+    assert(!__asan_address_is_poisoned(beg + idx));
+  delete[] beg;
+}
+
+int main(int argc, char **argv) {
+  int n = argc == 1 ? 128 : atoi(argv[1]);
+  for (int i = 0; i <= n; i++)
+    TestContainer(i);
+}