src/llvm/lib/Support/ThreadLocal.cpp

   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