new helper class to provide more explicit management of static ctor/dtors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30638 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/ManagedStatic.cpp b/lib/Support/ManagedStatic.cpp
new file mode 100644
index 0000000..85daaf8
--- /dev/null
+++ b/lib/Support/ManagedStatic.cpp
@@ -0,0 +1,53 @@
+//===-- 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(Ptr && 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_shutdown() {
+ while (StaticList)
+ StaticList->destroy();
+}
+