llvm-project/llvm/lib/Support/ManagedStatic.cpp

//===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the ManagedStatic class and llvm_shutdown().
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/ManagedStatic.h"
#include <cassert>
using namespace llvm;

static const ManagedStaticBase *StaticList = 0;

void ManagedStaticBase::RegisterManagedStatic(void *ObjPtr,
                                              void (*Deleter)(void*)) const {
  assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
         "Partially init static?");
  Ptr = ObjPtr;
  DeleterFn = Deleter;
  
  // Add to list of managed statics.
  Next = StaticList;
  StaticList = this;
}

void ManagedStaticBase::destroy() const {
  assert(DeleterFn && "ManagedStatic not initialized correctly!");
  assert(StaticList == this &&
         "Not destroyed in reverse order of construction?");
  // Unlink from list.
  StaticList = Next;
  Next = 0;

  // Destroy memory.
  DeleterFn(Ptr);
  
  // Cleanup.
  Ptr = 0;
  DeleterFn = 0;
}

/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
void llvm::llvm_shutdown() {
  while (StaticList)
    StaticList->destroy();
}