tsan: add __tsan_java_finalize interface function

It is required to prevent false positives between object ctor and finalizer,
as otherwise they look completely unsynchronized.

llvm-svn: 211829

2 files changed, 28 insertions, 0 deletions

diff --git a/compiler-rt/test/tsan/java.h b/compiler-rt/test/tsan/java.h
index 7aa0bca32ce..d986d08be06 100644
--- a/compiler-rt/test/tsan/java.h
+++ b/compiler-rt/test/tsan/java.h
@@ -11,6 +11,7 @@ int  __tsan_java_fini();
 void __tsan_java_alloc(jptr ptr, jptr size);
 void __tsan_java_free(jptr ptr, jptr size);
 void __tsan_java_move(jptr src, jptr dst, jptr size);
+void __tsan_java_finalize();
 void __tsan_java_mutex_lock(jptr addr);
 void __tsan_java_mutex_unlock(jptr addr);
 void __tsan_java_mutex_read_lock(jptr addr);
diff --git a/compiler-rt/test/tsan/java_finalizer.cc b/compiler-rt/test/tsan/java_finalizer.cc
new file mode 100644
index 00000000000..706b946be61
--- /dev/null
+++ b/compiler-rt/test/tsan/java_finalizer.cc
@@ -0,0 +1,27 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t | FileCheck %s
+#include "java.h"
+
+void *Thread(void *p) {
+  sleep(1);
+  __tsan_java_finalize();
+  *(int*)p = 42;
+  return 0;
+}
+
+int main() {
+  int const kHeapSize = 1024 * 1024;
+  void *jheap = (char*)malloc(kHeapSize + 8) + 8;
+  __tsan_java_init((jptr)jheap, kHeapSize);
+  const int kBlockSize = 16;
+  __tsan_java_alloc((jptr)jheap, kBlockSize);
+  pthread_t th;
+  pthread_create(&th, 0, Thread, jheap);
+  *(int*)jheap = 43;
+  pthread_join(th, 0);
+  __tsan_java_free((jptr)jheap, kBlockSize);
+  fprintf(stderr, "DONE\n");
+  return __tsan_java_fini();
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer: data race
+// CHECK: DONE