1 files changed, 70 insertions, 0 deletions
diff --git a/src/rocksdb/port/lang.h b/src/rocksdb/port/lang.h
new file mode 100644
index 000000000..52c597acd
--- /dev/null
+++ b/src/rocksdb/port/lang.h
@@ -0,0 +1,70 @@
+// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+
+#ifndef FALLTHROUGH_INTENDED
+#if defined(__clang__)
+#define FALLTHROUGH_INTENDED [[clang::fallthrough]]
+#elif defined(__GNUC__) && __GNUC__ >= 7
+#define FALLTHROUGH_INTENDED [[gnu::fallthrough]]
+#else
+#define FALLTHROUGH_INTENDED \
+  do {                       \
+  } while (0)
+#endif
+#endif
+
+#define DECLARE_DEFAULT_MOVES(Name) \
+  Name(Name&&) noexcept = default;  \
+  Name& operator=(Name&&) = default
+
+// ASAN (Address sanitizer)
+
+#if defined(__clang__)
+#if defined(__has_feature)
+#if __has_feature(address_sanitizer)
+#define MUST_FREE_HEAP_ALLOCATIONS 1
+#endif  // __has_feature(address_sanitizer)
+#endif  // defined(__has_feature)
+#else   // __clang__
+#ifdef __SANITIZE_ADDRESS__
+#define MUST_FREE_HEAP_ALLOCATIONS 1
+#endif  // __SANITIZE_ADDRESS__
+#endif  // __clang__
+
+#ifdef ROCKSDB_VALGRIND_RUN
+#define MUST_FREE_HEAP_ALLOCATIONS 1
+#endif  // ROCKSDB_VALGRIND_RUN
+
+// Coding guidelines say to avoid static objects with non-trivial destructors,
+// because it's easy to cause trouble (UB) in static destruction. This
+// macro makes it easier to define static objects that are normally never
+// destructed, except are destructed when running under ASAN. This should
+// avoid unexpected, unnecessary destruction behavior in production.
+// Note that constructor arguments can be provided as in
+//   STATIC_AVOID_DESTRUCTION(Foo, foo)(arg1, arg2);
+#ifdef MUST_FREE_HEAP_ALLOCATIONS
+#define STATIC_AVOID_DESTRUCTION(Type, name) static Type name
+constexpr bool kMustFreeHeapAllocations = true;
+#else
+#define STATIC_AVOID_DESTRUCTION(Type, name) static Type& name = *new Type
+constexpr bool kMustFreeHeapAllocations = false;
+#endif
+
+// TSAN (Thread sanitizer)
+
+// For simplicity, standardize on the GCC define
+#if defined(__clang__)
+#if defined(__has_feature) && __has_feature(thread_sanitizer)
+#define __SANITIZE_THREAD__ 1
+#endif  // __has_feature(thread_sanitizer)
+#endif  // __clang__
+
+#ifdef __SANITIZE_THREAD__
+#define TSAN_SUPPRESSION __attribute__((no_sanitize("thread")))
+#else
+#define TSAN_SUPPRESSION
+#endif  // TSAN_SUPPRESSION