2006-09-28 08:31:55 +08:00
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//===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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2007-12-30 04:36:04 +08:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2006-09-28 08:31:55 +08:00
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ManagedStatic class and llvm_shutdown().
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ManagedStatic.h"
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2009-05-20 08:39:20 +08:00
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#include "llvm/Config/config.h"
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2014-06-21 08:24:51 +08:00
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/MutexGuard.h"
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2016-06-03 02:22:12 +08:00
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#include "llvm/Support/Threading.h"
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2006-09-28 08:31:55 +08:00
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#include <cassert>
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using namespace llvm;
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2014-04-07 12:17:22 +08:00
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static const ManagedStaticBase *StaticList = nullptr;
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2016-06-03 02:22:12 +08:00
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static sys::Mutex *ManagedStaticMutex = nullptr;
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2017-02-06 05:13:06 +08:00
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static llvm::once_flag mutex_init_flag;
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2006-09-28 08:31:55 +08:00
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2016-06-03 02:22:12 +08:00
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static void initializeMutex() {
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ManagedStaticMutex = new sys::Mutex();
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}
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static sys::Mutex* getManagedStaticMutex() {
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2016-06-05 03:57:55 +08:00
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llvm::call_once(mutex_init_flag, initializeMutex);
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2014-06-21 08:24:51 +08:00
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return ManagedStaticMutex;
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2014-06-20 00:17:42 +08:00
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}
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2009-05-20 08:39:20 +08:00
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void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
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2006-09-28 08:31:55 +08:00
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void (*Deleter)(void*)) const {
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2014-04-18 04:30:35 +08:00
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assert(Creator);
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2009-06-17 01:33:51 +08:00
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if (llvm_is_multithreaded()) {
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2016-06-03 02:22:12 +08:00
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MutexGuard Lock(*getManagedStaticMutex());
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2009-05-20 08:39:20 +08:00
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2016-06-29 23:04:07 +08:00
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if (!Ptr.load(std::memory_order_relaxed)) {
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void *Tmp = Creator();
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2009-05-20 08:39:20 +08:00
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2016-06-29 23:04:07 +08:00
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Ptr.store(Tmp, std::memory_order_release);
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2009-05-20 08:39:20 +08:00
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DeleterFn = Deleter;
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2018-07-31 03:41:25 +08:00
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2009-05-20 08:39:20 +08:00
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// Add to list of managed statics.
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Next = StaticList;
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StaticList = this;
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}
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} else {
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2014-04-15 14:32:26 +08:00
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assert(!Ptr && !DeleterFn && !Next &&
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2009-05-30 09:09:53 +08:00
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"Partially initialized ManagedStatic!?");
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2014-04-18 04:30:35 +08:00
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Ptr = Creator();
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2009-05-20 08:39:20 +08:00
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DeleterFn = Deleter;
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2018-07-31 03:41:25 +08:00
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2009-05-20 08:39:20 +08:00
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// Add to list of managed statics.
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Next = StaticList;
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StaticList = this;
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}
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2006-09-28 08:31:55 +08:00
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}
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void ManagedStaticBase::destroy() const {
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2007-02-20 14:18:57 +08:00
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assert(DeleterFn && "ManagedStatic not initialized correctly!");
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2006-09-28 08:31:55 +08:00
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assert(StaticList == this &&
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"Not destroyed in reverse order of construction?");
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// Unlink from list.
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StaticList = Next;
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2014-04-07 12:17:22 +08:00
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Next = nullptr;
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2006-09-28 08:31:55 +08:00
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// Destroy memory.
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DeleterFn(Ptr);
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2018-07-31 03:41:25 +08:00
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2006-09-28 08:31:55 +08:00
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// Cleanup.
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2014-04-07 12:17:22 +08:00
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Ptr = nullptr;
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DeleterFn = nullptr;
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2006-09-28 08:31:55 +08:00
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}
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/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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2006-09-30 02:43:14 +08:00
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void llvm::llvm_shutdown() {
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2016-06-03 02:22:12 +08:00
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MutexGuard Lock(*getManagedStaticMutex());
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2014-06-20 00:17:42 +08:00
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2014-10-14 23:58:16 +08:00
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while (StaticList)
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StaticList->destroy();
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2006-09-28 08:31:55 +08:00
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}
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