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llvm-mirror/include/llvm/Support/RecyclingAllocator.h
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

77 lines
2.4 KiB
C++

//==- llvm/Support/RecyclingAllocator.h - Recycling Allocator ----*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the RecyclingAllocator class. See the doxygen comment for
// RecyclingAllocator for more details on the implementation.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_RECYCLINGALLOCATOR_H
#define LLVM_SUPPORT_RECYCLINGALLOCATOR_H
#include "llvm/Support/Recycler.h"
namespace llvm {
/// RecyclingAllocator - This class wraps an Allocator, adding the
/// functionality of recycling deleted objects.
///
template <class AllocatorType, class T, size_t Size = sizeof(T),
size_t Align = alignof(T)>
class RecyclingAllocator {
private:
/// Base - Implementation details.
///
Recycler<T, Size, Align> Base;
/// Allocator - The wrapped allocator.
///
AllocatorType Allocator;
public:
~RecyclingAllocator() { Base.clear(Allocator); }
/// Allocate - Return a pointer to storage for an object of type
/// SubClass. The storage may be either newly allocated or recycled.
///
template<class SubClass>
SubClass *Allocate() { return Base.template Allocate<SubClass>(Allocator); }
T *Allocate() { return Base.Allocate(Allocator); }
/// Deallocate - Release storage for the pointed-to object. The
/// storage will be kept track of and may be recycled.
///
template<class SubClass>
void Deallocate(SubClass* E) { return Base.Deallocate(Allocator, E); }
void PrintStats() {
Allocator.PrintStats();
Base.PrintStats();
}
};
}
template<class AllocatorType, class T, size_t Size, size_t Align>
inline void *operator new(size_t size,
llvm::RecyclingAllocator<AllocatorType,
T, Size, Align> &Allocator) {
assert(size <= Size && "allocation size exceeded");
return Allocator.Allocate();
}
template<class AllocatorType, class T, size_t Size, size_t Align>
inline void operator delete(void *E,
llvm::RecyclingAllocator<AllocatorType,
T, Size, Align> &A) {
A.Deallocate(E);
}
#endif