Check in LLVM r95781.
diff --git a/lib/Support/ManagedStatic.cpp b/lib/Support/ManagedStatic.cpp
new file mode 100644
index 0000000..4e655a0
--- /dev/null
+++ b/lib/Support/ManagedStatic.cpp
@@ -0,0 +1,75 @@
+//===-- 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/System/Atomic.h"
+#include <cassert>
+using namespace llvm;
+
+static const ManagedStaticBase *StaticList = 0;
+
+void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
+ void (*Deleter)(void*)) const {
+ if (llvm_is_multithreaded()) {
+ llvm_acquire_global_lock();
+
+ if (Ptr == 0) {
+ void* tmp = Creator ? Creator() : 0;
+
+ sys::MemoryFence();
+ Ptr = tmp;
+ DeleterFn = Deleter;
+
+ // Add to list of managed statics.
+ Next = StaticList;
+ StaticList = this;
+ }
+
+ llvm_release_global_lock();
+ } else {
+ assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
+ "Partially initialized ManagedStatic!?");
+ Ptr = Creator ? Creator() : 0;
+ 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();
+
+ if (llvm_is_multithreaded()) llvm_stop_multithreaded();
+}
+