llvm-6502/include/llvm/Support/ManagedStatic.h
Chris Lattner bdbf5fd1c9 add a helper to call llvm_shutdown()
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32249 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-06 01:01:14 +00:00

88 lines
2.3 KiB
C++

//===-- llvm/Support/ManagedStatic.h - Static Global wrapper ----*- C++ -*-===//
//
// 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 defines the ManagedStatic class and the llvm_shutdown() function.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_MANAGED_STATIC_H
#define LLVM_SUPPORT_MANAGED_STATIC_H
namespace llvm {
/// object_deleter - Helper method for ManagedStatic.
///
template<class C>
void object_deleter(void *Ptr) {
delete (C*)Ptr;
}
/// ManagedStaticBase - Common base class for ManagedStatic instances.
class ManagedStaticBase {
protected:
// This should only be used as a static variable, which guarantees that this
// will be zero initialized.
mutable void *Ptr;
mutable void (*DeleterFn)(void*);
mutable const ManagedStaticBase *Next;
void RegisterManagedStatic(void *ObjPtr, void (*deleter)(void*)) const;
public:
void destroy() const;
};
/// ManagedStatic - This transparently changes the behavior of global statics to
/// be lazily constructed on demand (good for reducing startup times of dynamic
/// libraries that link in LLVM components) and for making destruction be
/// explicit through the llvm_shutdown() function call.
///
template<class C>
class ManagedStatic : public ManagedStaticBase {
public:
// Accessors.
C &operator*() {
if (!Ptr) LazyInit();
return *static_cast<C*>(Ptr);
}
C *operator->() {
if (!Ptr) LazyInit();
return static_cast<C*>(Ptr);
}
const C &operator*() const {
if (!Ptr) LazyInit();
return *static_cast<C*>(Ptr);
}
const C *operator->() const {
if (!Ptr) LazyInit();
return static_cast<C*>(Ptr);
}
public:
void LazyInit() const {
RegisterManagedStatic(new C(), object_deleter<C>);
}
};
/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
void llvm_shutdown();
/// llvm_shutdown_obj - This is a simple helper class that calls
/// llvm_shutdown() when it is destroyed.
struct llvm_shutdown_obj {
llvm_shutdown_obj() {}
~llvm_shutdown_obj() { llvm_shutdown(); }
};
}
#endif