Imported Upstream version 5.18.0.247

Former-commit-id: 2d6af2e4ed0eda5cbdc2946446ef7718456ad190

external/llvm/lib/Support/ManagedStatic.cpp

@@ -1,88 +0,0 @@
-//===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file 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 "llvm/Config/config.h"
-#include "llvm/Support/Mutex.h"
-#include "llvm/Support/MutexGuard.h"
-#include "llvm/Support/Threading.h"
-#include <cassert>
-using namespace llvm;
-
-static const ManagedStaticBase *StaticList = nullptr;
-static sys::Mutex *ManagedStaticMutex = nullptr;
-static llvm::once_flag mutex_init_flag;
-
-static void initializeMutex() {
-  ManagedStaticMutex = new sys::Mutex();
-}
-
-static sys::Mutex* getManagedStaticMutex() {
-  // We need to use a function local static here, since this can get called
-  // during a static constructor and we need to guarantee that it's initialized
-  // correctly.
-  llvm::call_once(mutex_init_flag, initializeMutex);
-  return ManagedStaticMutex;
-}
-
-void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
-                                              void (*Deleter)(void*)) const {
-  assert(Creator);
-  if (llvm_is_multithreaded()) {
-    MutexGuard Lock(*getManagedStaticMutex());
-
-    if (!Ptr.load(std::memory_order_relaxed)) {
-      void *Tmp = Creator();
-
-      Ptr.store(Tmp, std::memory_order_release);
-      DeleterFn = Deleter;
-      
-      // Add to list of managed statics.
-      Next = StaticList;
-      StaticList = this;
-    }
-  } else {
-    assert(!Ptr && !DeleterFn && !Next &&
-           "Partially initialized ManagedStatic!?");
-    Ptr = Creator();
-    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 = nullptr;
-
-  // Destroy memory.
-  DeleterFn(Ptr);
-  
-  // Cleanup.
-  Ptr = nullptr;
-  DeleterFn = nullptr;
-}
-
-/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
-void llvm::llvm_shutdown() {
-  MutexGuard Lock(*getManagedStaticMutex());
-
-  while (StaticList)
-    StaticList->destroy();
-}