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e14d81deeb
for handling bookkeeping for deleted objects, as well as the alist class template, for keeping lists of objects allocated from Recyclers, and some related utilities. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53210 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
//==- llvm/Support/Recycler.h - Recycling Allocator --------------*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the Recycler class template. See the doxygen comment for
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// Recycler for more details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_RECYCLER_H
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#define LLVM_SUPPORT_RECYCLER_H
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#include <cassert>
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#include "llvm/ADT/alist_node.h"
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namespace llvm {
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/// PrintRecyclingAllocatorStats - Helper for RecyclingAllocator for
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/// printing statistics.
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///
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void PrintRecyclerStats(size_t LargestTypeSize, size_t FreeListSize);
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/// Recycler - This class manages a linked-list of deallocated nodes
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/// and facilitates reusing deallocated memory in place of allocating
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/// new memory. The objects it allocates are stored in alist_node
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/// containers, so they may be used in alists.
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///
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template<class T, class LargestT = T>
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class Recycler {
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typedef alist_node<T, LargestT> NodeTy;
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/// FreeListTraits - ilist traits for FreeList.
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///
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struct FreeListTraits : ilist_traits<alist_node<T, LargestT> > {
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NodeTy &getSentinel() { return this->Sentinel; }
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};
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/// FreeList - Doubly-linked list of nodes that have deleted contents and
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/// are not in active use.
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///
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iplist<NodeTy, FreeListTraits> FreeList;
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/// CreateNewNode - Allocate a new node object and initialize its
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/// prev and next pointers to 0.
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///
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template<class AllocatorType>
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NodeTy *CreateNewNode(AllocatorType &Allocator) {
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// Note that we're calling new on the *node*, to initialize its
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// Next/Prev pointers, not new on the end-user object.
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return new (Allocator.Allocate<NodeTy>()) NodeTy();
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}
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public:
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~Recycler() { assert(FreeList.empty()); }
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template<class AllocatorType>
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void clear(AllocatorType &Allocator) {
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while (!FreeList.empty())
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Allocator.Deallocate(FreeList.remove(FreeList.begin()));
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}
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template<class SubClass, class AllocatorType>
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SubClass *Allocate(AllocatorType &Allocator) {
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NodeTy *N = !FreeList.empty() ?
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FreeList.remove(FreeList.front()) :
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CreateNewNode(Allocator);
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assert(N->getPrev() == 0);
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assert(N->getNext() == 0);
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return N->getElement((SubClass*)0);
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}
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template<class AllocatorType>
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T *Allocate(AllocatorType &Allocator) {
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return Allocate<T>(Allocator);
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}
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template<class SubClass, class AllocatorType>
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void Deallocate(AllocatorType &Allocator, SubClass* Element) {
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NodeTy *N = NodeTy::getNode(Element);
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assert(N->getPrev() == 0);
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assert(N->getNext() == 0);
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FreeList.push_front(N);
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}
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void PrintStats() {
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PrintRecyclerStats(sizeof(LargestT), FreeList.size());
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}
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};
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}
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#endif
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