Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/lib/Support/ThreadLocal.cpp

@@ -0,0 +1,48 @@
+//===- ThreadLocal.cpp - Thread Local Data ----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the llvm::sys::ThreadLocal class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/ThreadLocal.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Compiler.h"
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//===          independent code.
+//===----------------------------------------------------------------------===//
+
+#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
+// Define all methods as no-ops if threading is explicitly disabled
+namespace llvm {
+using namespace sys;
+ThreadLocalImpl::ThreadLocalImpl() : data() { }
+ThreadLocalImpl::~ThreadLocalImpl() { }
+void ThreadLocalImpl::setInstance(const void* d) {
+  static_assert(sizeof(d) <= sizeof(data), "size too big");
+  void **pd = reinterpret_cast<void**>(&data);
+  *pd = const_cast<void*>(d);
+}
+void *ThreadLocalImpl::getInstance() {
+  void **pd = reinterpret_cast<void**>(&data);
+  return *pd;
+}
+void ThreadLocalImpl::removeInstance() {
+  setInstance(nullptr);
+}
+}
+#elif defined(LLVM_ON_UNIX)
+#include "Unix/ThreadLocal.inc"
+#elif defined( LLVM_ON_WIN32)
+#include "Windows/ThreadLocal.inc"
+#else
+#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp
+#endif