1 //===-- ManagedStatic.cpp - Static Global wrapper -------------------------===// 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 ManagedStatic class and llvm_shutdown(). 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Support/ManagedStatic.h" 15 #include "llvm/Config/config.h" 16 #include "llvm/Support/Atomic.h" 17 #include <cassert> 18 using namespace llvm; 19 20 static const ManagedStaticBase *StaticList = 0; 21 22 void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(), 23 void (*Deleter)(void*)) const { 24 if (llvm_is_multithreaded()) { 25 llvm_acquire_global_lock(); 26 27 if (Ptr == 0) { 28 void* tmp = Creator ? Creator() : 0; 29 30 sys::MemoryFence(); 31 Ptr = tmp; 32 DeleterFn = Deleter; 33 34 // Add to list of managed statics. 35 Next = StaticList; 36 StaticList = this; 37 } 38 39 llvm_release_global_lock(); 40 } else { 41 assert(Ptr == 0 && DeleterFn == 0 && Next == 0 && 42 "Partially initialized ManagedStatic!?"); 43 Ptr = Creator ? Creator() : 0; 44 DeleterFn = Deleter; 45 46 // Add to list of managed statics. 47 Next = StaticList; 48 StaticList = this; 49 } 50 } 51 52 void ManagedStaticBase::destroy() const { 53 assert(DeleterFn && "ManagedStatic not initialized correctly!"); 54 assert(StaticList == this && 55 "Not destroyed in reverse order of construction?"); 56 // Unlink from list. 57 StaticList = Next; 58 Next = 0; 59 60 // Destroy memory. 61 DeleterFn(Ptr); 62 63 // Cleanup. 64 Ptr = 0; 65 DeleterFn = 0; 66 } 67 68 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables. 69 void llvm::llvm_shutdown() { 70 while (StaticList) 71 StaticList->destroy(); 72 73 if (llvm_is_multithreaded()) llvm_stop_multithreaded(); 74 } 75 76
