Index: lib/sanitizer_common/CMakeLists.txt
===================================================================
--- lib/sanitizer_common/CMakeLists.txt
+++ lib/sanitizer_common/CMakeLists.txt
@@ -71,7 +71,8 @@
   sanitizer_stoptheworld_linux_libcdep.cc
   sanitizer_symbolizer_libcdep.cc
   sanitizer_symbolizer_posix_libcdep.cc
-  sanitizer_unwind_linux_libcdep.cc)
+  sanitizer_unwind_linux_libcdep.cc
+  sanitizer_unwind_win.cc)
 
 set(SANITIZER_COVERAGE_SOURCES
   sancov_flags.cc
Index: lib/sanitizer_common/sanitizer_unwind_win.cc
===================================================================
--- lib/sanitizer_common/sanitizer_unwind_win.cc
+++ lib/sanitizer_common/sanitizer_unwind_win.cc
@@ -0,0 +1,75 @@
+//===-- sanitizer_unwind_win.cc -------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// Sanitizer unwind Windows specific functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_platform.h"
+#if SANITIZER_WINDOWS
+
+#define WIN32_LEAN_AND_MEAN
+#define NOGDI
+#include <windows.h>
+
+#include "sanitizer_dbghelp.h"  // for StackWalk64
+#include "sanitizer_stacktrace.h"
+#include "sanitizer_symbolizer.h"  // for InitializeDbgHelpIfNeeded
+
+using namespace __sanitizer;
+
+#if !SANITIZER_GO
+void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
+  CHECK_GE(max_depth, 2);
+  // FIXME: CaptureStackBackTrace might be too slow for us.
+  // FIXME: Compare with StackWalk64.
+  // FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
+  size = CaptureStackBackTrace(1, Min(max_depth, kStackTraceMax),
+    (void **)&trace_buffer[0], 0);
+  if (size == 0)
+    return;
+
+  // Skip the RTL frames by searching for the PC in the stacktrace.
+  uptr pc_location = LocatePcInTrace(pc);
+  PopStackFrames(pc_location);
+}
+
+void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
+  u32 max_depth) {
+  CONTEXT ctx = *(CONTEXT *)context;
+  STACKFRAME64 stack_frame;
+  memset(&stack_frame, 0, sizeof(stack_frame));
+
+  InitializeDbgHelpIfNeeded();
+
+  size = 0;
+#if defined(_WIN64)
+  int machine_type = IMAGE_FILE_MACHINE_AMD64;
+  stack_frame.AddrPC.Offset = ctx.Rip;
+  stack_frame.AddrFrame.Offset = ctx.Rbp;
+  stack_frame.AddrStack.Offset = ctx.Rsp;
+#else
+  int machine_type = IMAGE_FILE_MACHINE_I386;
+  stack_frame.AddrPC.Offset = ctx.Eip;
+  stack_frame.AddrFrame.Offset = ctx.Ebp;
+  stack_frame.AddrStack.Offset = ctx.Esp;
+#endif
+  stack_frame.AddrPC.Mode = AddrModeFlat;
+  stack_frame.AddrFrame.Mode = AddrModeFlat;
+  stack_frame.AddrStack.Mode = AddrModeFlat;
+  while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
+    &stack_frame, &ctx, NULL, SymFunctionTableAccess64,
+    SymGetModuleBase64, NULL) &&
+    size < Min(max_depth, kStackTraceMax)) {
+    trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
+  }
+}
+#endif  // #if !SANITIZER_GO
+
+#endif  // SANITIZER_WINDOWS
Index: lib/sanitizer_common/sanitizer_win.cc
===================================================================
--- lib/sanitizer_common/sanitizer_win.cc
+++ lib/sanitizer_common/sanitizer_win.cc
@@ -23,13 +23,10 @@
 #include <stdlib.h>
 
 #include "sanitizer_common.h"
-#include "sanitizer_dbghelp.h"
 #include "sanitizer_file.h"
 #include "sanitizer_libc.h"
 #include "sanitizer_mutex.h"
 #include "sanitizer_placement_new.h"
-#include "sanitizer_stacktrace.h"
-#include "sanitizer_symbolizer.h"
 #include "sanitizer_win_defs.h"
 
 // A macro to tell the compiler that this part of the code cannot be reached,
@@ -840,54 +837,6 @@
 #endif
 }
 
-#if !SANITIZER_GO
-void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
-  CHECK_GE(max_depth, 2);
-  // FIXME: CaptureStackBackTrace might be too slow for us.
-  // FIXME: Compare with StackWalk64.
-  // FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
-  size = CaptureStackBackTrace(1, Min(max_depth, kStackTraceMax),
-                               (void **)&trace_buffer[0], 0);
-  if (size == 0)
-    return;
-
-  // Skip the RTL frames by searching for the PC in the stacktrace.
-  uptr pc_location = LocatePcInTrace(pc);
-  PopStackFrames(pc_location);
-}
-
-void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
-                                                    u32 max_depth) {
-  CONTEXT ctx = *(CONTEXT *)context;
-  STACKFRAME64 stack_frame;
-  memset(&stack_frame, 0, sizeof(stack_frame));
-
-  InitializeDbgHelpIfNeeded();
-
-  size = 0;
-#if defined(_WIN64)
-  int machine_type = IMAGE_FILE_MACHINE_AMD64;
-  stack_frame.AddrPC.Offset = ctx.Rip;
-  stack_frame.AddrFrame.Offset = ctx.Rbp;
-  stack_frame.AddrStack.Offset = ctx.Rsp;
-#else
-  int machine_type = IMAGE_FILE_MACHINE_I386;
-  stack_frame.AddrPC.Offset = ctx.Eip;
-  stack_frame.AddrFrame.Offset = ctx.Ebp;
-  stack_frame.AddrStack.Offset = ctx.Esp;
-#endif
-  stack_frame.AddrPC.Mode = AddrModeFlat;
-  stack_frame.AddrFrame.Mode = AddrModeFlat;
-  stack_frame.AddrStack.Mode = AddrModeFlat;
-  while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
-                     &stack_frame, &ctx, NULL, SymFunctionTableAccess64,
-                     SymGetModuleBase64, NULL) &&
-         size < Min(max_depth, kStackTraceMax)) {
-    trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
-  }
-}
-#endif  // #if !SANITIZER_GO
-
 void ReportFile::Write(const char *buffer, uptr length) {
   SpinMutexLock l(mu);
   ReopenIfNecessary();