1 files changed, 50 insertions, 0 deletions
diff --git a/test/lsan/TestCases/use_tls_dynamic.cc b/test/lsan/TestCases/use_tls_dynamic.cc
new file mode 100644
index 000000000000..860db041ae40
--- /dev/null
+++ b/test/lsan/TestCases/use_tls_dynamic.cc
@@ -0,0 +1,50 @@
+// Test that dynamically allocated TLS space is included in the root set.
+// RUN: LSAN_BASE="report_objects=1:use_stacks=0:use_registers=0"
+// RUN: %clangxx %s -DBUILD_DSO -fPIC -shared -o %t-so.so
+// RUN: %clangxx_lsan %s -o %t
+// RUN: LSAN_OPTIONS=$LSAN_BASE:"use_tls=0" not %run %t 2>&1 | FileCheck %s
+// RUN: LSAN_OPTIONS=$LSAN_BASE:"use_tls=1" %run %t 2>&1
+// RUN: LSAN_OPTIONS="" %run %t 2>&1
+
+#ifndef BUILD_DSO
+#include <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+
+int main(int argc, char *argv[]) {
+  std::string path = std::string(argv[0]) + "-so.so";
+
+  void *handle = dlopen(path.c_str(), RTLD_LAZY);
+  assert(handle != 0);
+  typedef void **(* store_t)(void *p);
+  store_t StoreToTLS = (store_t)dlsym(handle, "StoreToTLS");
+  assert(dlerror() == 0);
+
+  void *p = malloc(1337);
+  // If we don't  know about dynamic TLS, we will return a false leak above.
+  void **p_in_tls = StoreToTLS(p);
+  assert(*p_in_tls == p);
+  fprintf(stderr, "Test alloc: %p.\n", p);
+  return 0;
+}
+// CHECK: Test alloc: [[ADDR:.*]].
+// CHECK: LeakSanitizer: detected memory leaks
+// CHECK: [[ADDR]] (1337 bytes)
+// CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer:
+
+#else  // BUILD_DSO
+// A loadable module with a large thread local section, which would require
+// allocation of a new TLS storage chunk when loaded with dlopen(). We use it
+// to test the reachability of such chunks in LSan tests.
+
+// This must be large enough that it doesn't fit into preallocated static TLS
+// space (see STATIC_TLS_SURPLUS in glibc).
+__thread void *huge_thread_local_array[(1 << 20) / sizeof(void *)]; // NOLINT
+
+extern "C" void **StoreToTLS(void *p) {
+  huge_thread_local_array[0] = p;
+  return &huge_thread_local_array[0];
+}
+#endif  // BUILD_DSO