mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-17 18:10:31 +00:00
7ed47a1335
discussion of this change. Boy are my fingers tired. ;-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45411 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
//===-- llvm/Support/ManagedStatic.h - Static Global wrapper ----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file 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:
|
|
/// isConstructed - Return true if this object has not been created yet.
|
|
bool isConstructed() const { return Ptr != 0; }
|
|
|
|
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>);
|
|
}
|
|
};
|
|
|
|
template<void (*CleanupFn)(void*)>
|
|
class ManagedCleanup : public ManagedStaticBase {
|
|
public:
|
|
void Register() { RegisterManagedStatic(0, CleanupFn); }
|
|
};
|
|
|
|
|
|
/// 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
|