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Update per review. Patch by Mikhail Glushenkov!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47628 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2008-02-26 21:44:24 +00:00
parent 74ab84c31e
commit 95e78348f0
1 changed files with 17 additions and 56 deletions
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73
include/llvm/ADT/IntrusiveRefCntPtr.h
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@ -22,34 +22,13 @@
#define LLVM_ADT_INTRUSIVE_REF_CNT_PTR
#include <cassert>
#include <cstddef>
#include "llvm/Support/Casting.h"
// Forward declarations
namespace llvm {
template <class T>
class RefCountedBase;
template <class T>
class RefCountedBaseVPTR;
}
template <class T>
void IntrusivePtrAddRef(llvm::RefCountedBase<T>*);
template <class T>
void IntrusivePtrRelease(llvm::RefCountedBase<T>*);
template <class T>
void IntrusivePtrAddRef(llvm::RefCountedBaseVPTR<T>*);
template <class T>
void IntrusivePtrRelease(llvm::RefCountedBaseVPTR<T>*);
namespace llvm {
class IntrusiveRefCntPtr;
//===----------------------------------------------------------------------===//
/// RefCountedBase - A generic base class for objects that wish to
@ -74,16 +53,16 @@ namespace llvm {
if (--ref_cnt == 0) delete static_cast<Derived*>(this);
}
friend void IntrusivePtrAddRef<Derived>(RefCountedBase<Derived>*);
friend void IntrusivePtrRelease<Derived>(RefCountedBase<Derived>*);
friend class IntrusiveRefCntPtr<Derived>;
};
//===----------------------------------------------------------------------===//
/// RefCountedBaseVPTR - A class that has the same function as
/// RefCountedBase, but with a virtual destructor. Should be used
/// instead of RefCountedBase for classes that have virtual
/// destructors. Classes that inherit from RefCountedBaseVPTR can't
/// be allocated on stack.
/// instead of RefCountedBase for classes that already have virtual
/// methods to enforce dynamic allocation via 'new'. Classes that
/// inherit from RefCountedBaseVPTR can't be allocated on stack -
/// attempting to do this will produce a compile error.
//===----------------------------------------------------------------------===//
template <class Derived>
class RefCountedBaseVPTR {
@ -99,33 +78,9 @@ namespace llvm {
if (--ref_cnt == 0) delete this;
}
friend void IntrusivePtrAddRef<Derived>(RefCountedBaseVPTR<Derived>*);
friend void IntrusivePtrRelease<Derived>(RefCountedBaseVPTR<Derived>*);
friend class IntrusiveRefCntPtr<Derived>;
};
}
//===----------------------------------------------------------------------===//
/// IntrusivePtrAddRef - A utility function used by IntrusiveRefCntPtr
/// to increment the reference count of an RefCountedBase-derived object.
//===----------------------------------------------------------------------===//
template <class T>
void IntrusivePtrAddRef(llvm::RefCountedBase<T>* O) {
O->Retain();
}
//===----------------------------------------------------------------------===//
/// IntrusivePtrRelease - The complement of IntrusivePtrAddRef;
/// decrements the reference count of a RefCounted object.
//===----------------------------------------------------------------------===//
template <class T>
void IntrusivePtrRelease(llvm::RefCountedBase<T>* O) {
O->Release();
}
namespace llvm {
//===----------------------------------------------------------------------===//
/// IntrusiveRefCntPtr - A template class that implements a "smart pointer"
/// that assumes the wrapped object has a reference count associated
@ -136,6 +91,12 @@ namespace llvm {
/// incremented and upon destruction of the smart pointer the
/// reference count is decremented. This class also safely handles
/// wrapping NULL pointers.
///
/// Reference counting is implemented via calls to
/// Obj->Retain()/Obj->Release(). Release() is required to destroy
/// the object when the reference count reaches zero. Inheriting from
/// RefCountedBase/RefCountedBaseVPTR takes care of this
/// automatically.
//===----------------------------------------------------------------------===//
template <typename T>
class IntrusiveRefCntPtr {
@ -144,7 +105,7 @@ namespace llvm {
public:
typedef T element_type;
explicit IntrusiveRefCntPtr() : Obj(NULL) {}
explicit IntrusiveRefCntPtr() : Obj(0) {}
explicit IntrusiveRefCntPtr(T* obj) : Obj(obj) {
retain();
@ -181,7 +142,7 @@ namespace llvm {
typedef T * IntrusiveRefCntPtr::*unspecified_bool_type;
operator unspecified_bool_type() const {
return Obj == NULL ? NULL : &IntrusiveRefCntPtr::getPtr;
return Obj == 0 ? 0 : &IntrusiveRefCntPtr::getPtr;
}
void swap(IntrusiveRefCntPtr& other) {
@ -191,8 +152,8 @@ namespace llvm {
}
private:
void retain() { if (Obj) IntrusivePtrAddRef(Obj); }
void release() { if (Obj) IntrusivePtrRelease(Obj); }
void retain() { if (Obj) Obj->Retain(); }
void release() { if (Obj) Obj->Release(); }
void replace(T* S) {
this_type(S).swap(this);