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annotate lib/Support/ManagedStatic.cpp @ 3:9ad51c7bc036

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 15 May 2013 06:43:32 +0900
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children 54457678186b
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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 <cassert>
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18 using namespace llvm;
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19
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20 static const ManagedStaticBase *StaticList = 0;
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21
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22 void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
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23 void (*Deleter)(void*)) const {
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24 if (llvm_is_multithreaded()) {
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25 llvm_acquire_global_lock();
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27 if (Ptr == 0) {
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28 void* tmp = Creator ? Creator() : 0;
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30 TsanHappensBefore(this);
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31 sys::MemoryFence();
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32
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33 // This write is racy against the first read in the ManagedStatic
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34 // accessors. The race is benign because it does a second read after a
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35 // memory fence, at which point it isn't possible to get a partial value.
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36 TsanIgnoreWritesBegin();
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37 Ptr = tmp;
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38 TsanIgnoreWritesEnd();
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39 DeleterFn = Deleter;
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40
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41 // Add to list of managed statics.
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42 Next = StaticList;
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43 StaticList = this;
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44 }
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45
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46 llvm_release_global_lock();
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47 } else {
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48 assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
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49 "Partially initialized ManagedStatic!?");
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50 Ptr = Creator ? Creator() : 0;
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51 DeleterFn = Deleter;
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52
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53 // Add to list of managed statics.
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54 Next = StaticList;
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55 StaticList = this;
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56 }
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57 }
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58
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59 void ManagedStaticBase::destroy() const {
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60 assert(DeleterFn && "ManagedStatic not initialized correctly!");
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61 assert(StaticList == this &&
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62 "Not destroyed in reverse order of construction?");
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63 // Unlink from list.
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64 StaticList = Next;
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65 Next = 0;
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66
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67 // Destroy memory.
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68 DeleterFn(Ptr);
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69
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70 // Cleanup.
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71 Ptr = 0;
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72 DeleterFn = 0;
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73 }
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74
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75 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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76 void llvm::llvm_shutdown() {
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77 while (StaticList)
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78 StaticList->destroy();
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79
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80 if (llvm_is_multithreaded()) llvm_stop_multithreaded();
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81 }