1 //===- ThreadLocal.cpp - Thread Local Data ----------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the llvm::sys::ThreadLocal class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Config/config.h"
15 #include "llvm/Support/Compiler.h"
16 #include "llvm/Support/ThreadLocal.h"
17 
18 //===----------------------------------------------------------------------===//
19 //=== WARNING: Implementation here must contain only TRULY operating system
20 //===          independent code.
21 //===----------------------------------------------------------------------===//
22 
23 #if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
24 // Define all methods as no-ops if threading is explicitly disabled
25 namespace llvm {
26 using namespace sys;
27 ThreadLocalImpl::ThreadLocalImpl() : data() { }
28 ThreadLocalImpl::~ThreadLocalImpl() { }
29 void ThreadLocalImpl::setInstance(const void* d) {
30   static_assert(sizeof(d) <= sizeof(data), "size too big");
31   void **pd = reinterpret_cast<void**>(&data);
32   *pd = const_cast<void*>(d);
33 }
34 void *ThreadLocalImpl::getInstance() {
35   void **pd = reinterpret_cast<void**>(&data);
36   return *pd;
37 }
38 void ThreadLocalImpl::removeInstance() {
39   setInstance(nullptr);
40 }
41 }
42 #elif defined(LLVM_ON_UNIX)
43 #include "Unix/ThreadLocal.inc"
44 #elif defined( LLVM_ON_WIN32)
45 #include "Windows/ThreadLocal.inc"
46 #else
47 #warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp
48 #endif
49