1 files changed, 51 insertions, 0 deletions
diff --git a/llvm/lib/Support/Windows/ThreadLocal.inc b/llvm/lib/Support/Windows/ThreadLocal.inc
new file mode 100644
index 000000000000..1e0ed955e9ab
--- /dev/null
+++ b/llvm/lib/Support/Windows/ThreadLocal.inc
@@ -0,0 +1,51 @@
+//= llvm/Support/Win32/ThreadLocal.inc - Win32 Thread Local Data -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Win32 specific (non-pthread) ThreadLocal class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic Win32 code that
+//===          is guaranteed to work on *all* Win32 variants.
+//===----------------------------------------------------------------------===//
+
+#include "WindowsSupport.h"
+#include "llvm/Support/ThreadLocal.h"
+
+namespace llvm {
+
+sys::ThreadLocalImpl::ThreadLocalImpl() : data() {
+  static_assert(sizeof(DWORD) <= sizeof(data), "size too big");
+  DWORD* tls = reinterpret_cast<DWORD*>(&data);
+  *tls = TlsAlloc();
+  assert(*tls != TLS_OUT_OF_INDEXES);
+}
+
+sys::ThreadLocalImpl::~ThreadLocalImpl() {
+  DWORD* tls = reinterpret_cast<DWORD*>(&data);
+  TlsFree(*tls);
+}
+
+void *sys::ThreadLocalImpl::getInstance() {
+  DWORD* tls = reinterpret_cast<DWORD*>(&data);
+  return TlsGetValue(*tls);
+}
+
+void sys::ThreadLocalImpl::setInstance(const void* d){
+  DWORD* tls = reinterpret_cast<DWORD*>(&data);
+  int errorcode = TlsSetValue(*tls, const_cast<void*>(d));
+  assert(errorcode != 0);
+  (void)errorcode;
+}
+
+void sys::ThreadLocalImpl::removeInstance() {
+  setInstance(0);
+}
+
+}