lib/Support/ManagedStatic.cpp

   1 //===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by Chris Lattner and is distributed under
   6 // the University of Illinois Open Source 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 <cassert>
  16 using namespace llvm;
  17
  18 static const ManagedStaticBase *StaticList = 0;
  19
  20 void ManagedStaticBase::RegisterManagedStatic(void *ObjPtr,
  21                                               void (*Deleter)(void*)) const {
  22   assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
  23          "Partially init static?");
  24   Ptr = ObjPtr;
  25   DeleterFn = Deleter;
  26
  27   // Add to list of managed statics.
  28   Next = StaticList;
  29   StaticList = this;
  30 }
  31
  32 void ManagedStaticBase::destroy() const {
  33   assert(DeleterFn && "ManagedStatic not initialized correctly!");
  34   assert(StaticList == this &&
  35          "Not destroyed in reverse order of construction?");
  36   // Unlink from list.
  37   StaticList = Next;
  38   Next = 0;
  39
  40   // Destroy memory.
  41   DeleterFn(Ptr);
  42
  43   // Cleanup.
  44   Ptr = 0;
  45   DeleterFn = 0;
  46 }
  47
  48 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
  49 void llvm::llvm_shutdown() {
  50   while (StaticList)
  51     StaticList->destroy();
  52 }
  53