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annotate lib/Support/ManagedStatic.cpp @ 83:60c9769439b8

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the ManagedStatic class and llvm_shutdown().
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Support/ManagedStatic.h"
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15 #include "llvm/Config/config.h"
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16 #include "llvm/Support/Atomic.h"
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17 #include "llvm/Support/Mutex.h"
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18 #include "llvm/Support/MutexGuard.h"
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19 #include <cassert>
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20 using namespace llvm;
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21
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22 static const ManagedStaticBase *StaticList = nullptr;
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23
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24 static sys::Mutex& getManagedStaticMutex() {
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25 // We need to use a function local static here, since this can get called
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26 // during a static constructor and we need to guarantee that it's initialized
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27 // correctly.
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28 static sys::Mutex ManagedStaticMutex;
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29 return ManagedStaticMutex;
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30 }
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31
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32 void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
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33 void (*Deleter)(void*)) const {
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34 assert(Creator);
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35 if (llvm_is_multithreaded()) {
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36 MutexGuard Lock(getManagedStaticMutex());
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37
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38 if (!Ptr) {
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39 void* tmp = Creator();
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40
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41 TsanHappensBefore(this);
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42 sys::MemoryFence();
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43
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44 // This write is racy against the first read in the ManagedStatic
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45 // accessors. The race is benign because it does a second read after a
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46 // memory fence, at which point it isn't possible to get a partial value.
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47 TsanIgnoreWritesBegin();
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48 Ptr = tmp;
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49 TsanIgnoreWritesEnd();
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50 DeleterFn = Deleter;
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51
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52 // Add to list of managed statics.
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53 Next = StaticList;
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54 StaticList = this;
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55 }
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56 } else {
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57 assert(!Ptr && !DeleterFn && !Next &&
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58 "Partially initialized ManagedStatic!?");
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59 Ptr = Creator();
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60 DeleterFn = Deleter;
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61
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62 // Add to list of managed statics.
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63 Next = StaticList;
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64 StaticList = this;
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65 }
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66 }
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67
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68 void ManagedStaticBase::destroy() const {
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69 assert(DeleterFn && "ManagedStatic not initialized correctly!");
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70 assert(StaticList == this &&
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71 "Not destroyed in reverse order of construction?");
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72 // Unlink from list.
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73 StaticList = Next;
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74 Next = nullptr;
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75
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76 // Destroy memory.
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77 DeleterFn(Ptr);
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78
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79 // Cleanup.
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80 Ptr = nullptr;
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81 DeleterFn = nullptr;
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82 }
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83
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84 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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85 void llvm::llvm_shutdown() {
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86 MutexGuard Lock(getManagedStaticMutex());
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87
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88 while (StaticList)
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89 StaticList->destroy();
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90 }