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diff --git a/lib/asan/asan_flags.h b/lib/asan/asan_flags.h
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+++ b/lib/asan/asan_flags.h
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+//===-- asan_flags.h -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// ASan runtime flags.
+//===----------------------------------------------------------------------===//
+
+#ifndef ASAN_FLAGS_H
+#define ASAN_FLAGS_H
+
+#include "sanitizer_common/sanitizer_interface_defs.h"
+
+// ASan flag values can be defined in three ways:
+// 1) initialized with default values at startup.
+// 2) overriden from string returned by user-specified function
+//    __asan_default_options().
+// 3) overriden from env variable ASAN_OPTIONS.
+
+extern "C" {
+// Can be overriden by user.
+const char *__asan_default_options() SANITIZER_WEAK_ATTRIBUTE;
+}  // extern "C"
+
+namespace __asan {
+
+struct Flags {
+  // Size (in bytes) of quarantine used to detect use-after-free errors.
+  // Lower value may reduce memory usage but increase the chance of
+  // false negatives.
+  int  quarantine_size;
+  // If set, uses in-process symbolizer from common sanitizer runtime.
+  bool symbolize;
+  // Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).
+  int  verbosity;
+  // Size (in bytes) of redzones around heap objects.
+  // Requirement: redzone >= 32, is a power of two.
+  int  redzone;
+  // If set, prints some debugging information and does additional checks.
+  bool debug;
+  // Controls the way to handle globals (0 - don't detect buffer overflow
+  // on globals, 1 - detect buffer overflow, 2 - print data about registered
+  // globals).
+  int  report_globals;
+  // Max number of stack frames kept for each allocation.
+  int  malloc_context_size;
+  // If set, uses custom wrappers and replacements for libc string functions
+  // to find more errors.
+  bool replace_str;
+  // If set, uses custom wrappers for memset/memcpy/memmove intinsics.
+  bool replace_intrin;
+  // Used on Mac only. See comments in asan_mac.cc and asan_malloc_mac.cc.
+  bool replace_cfallocator;
+  // Used on Mac only.
+  bool mac_ignore_invalid_free;
+  // ASan allocator flag. See asan_allocator.cc.
+  bool use_fake_stack;
+  // ASan allocator flag. Sets the maximal size of allocation request
+  // that would return memory filled with zero bytes.
+  int  max_malloc_fill_size;
+  // Override exit status if something was reported.
+  int  exitcode;
+  // If set, user may manually mark memory regions as poisoned or unpoisoned.
+  bool allow_user_poisoning;
+  // Number of seconds to sleep between printing an error report and
+  // terminating application. Useful for debug purposes (when one needs
+  // to attach gdb, for example).
+  int  sleep_before_dying;
+  // If set, registers ASan custom segv handler.
+  bool handle_segv;
+  // If set, uses alternate stack for signal handling.
+  bool use_sigaltstack;
+  // Allow the users to work around the bug in Nvidia drivers prior to 295.*.
+  bool check_malloc_usable_size;
+  // If set, explicitly unmaps (huge) shadow at exit.
+  bool unmap_shadow_on_exit;
+  // If set, calls abort() instead of _exit() after printing an error report.
+  bool abort_on_error;
+  // If set, prints ASan exit stats even after program terminates successfully.
+  bool atexit;
+  // By default, disable core dumper on 64-bit - it makes little sense
+  // to dump 16T+ core.
+  bool disable_core;
+};
+
+Flags *flags();
+void InitializeFlags(Flags *f, const char *env);
+
+}  // namespace __asan
+
+#endif  // ASAN_FLAGS_H