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117 lines
3.4 KiB
C++
117 lines
3.4 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 "llvm/ADT/ilist.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cassert>
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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 Size, size_t Align, 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.
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///
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template <class T, size_t Size = sizeof(T), size_t Align = alignof(T)>
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class Recycler {
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struct FreeNode {
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FreeNode *Next;
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};
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/// List of nodes that have deleted contents and are not in active use.
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FreeNode *FreeList = nullptr;
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FreeNode *pop_val() {
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auto *Val = FreeList;
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__asan_unpoison_memory_region(Val, Size);
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FreeList = FreeList->Next;
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__msan_allocated_memory(Val, Size);
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return Val;
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}
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void push(FreeNode *N) {
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N->Next = FreeList;
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FreeList = N;
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__asan_poison_memory_region(N, Size);
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}
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public:
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~Recycler() {
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// If this fails, either the callee has lost track of some allocation,
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// or the callee isn't tracking allocations and should just call
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// clear() before deleting the Recycler.
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assert(!FreeList && "Non-empty recycler deleted!");
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}
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/// clear - Release all the tracked allocations to the allocator. The
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/// recycler must be free of any tracked allocations before being
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/// deleted; calling clear is one way to ensure this.
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template<class AllocatorType>
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void clear(AllocatorType &Allocator) {
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while (FreeList) {
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T *t = reinterpret_cast<T *>(pop_val());
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Allocator.Deallocate(t);
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}
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}
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/// Special case for BumpPtrAllocator which has an empty Deallocate()
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/// function.
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///
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/// There is no need to traverse the free list, pulling all the objects into
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/// cache.
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void clear(BumpPtrAllocator &) { FreeList = nullptr; }
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template<class SubClass, class AllocatorType>
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SubClass *Allocate(AllocatorType &Allocator) {
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static_assert(alignof(SubClass) <= Align,
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"Recycler allocation alignment is less than object align!");
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static_assert(sizeof(SubClass) <= Size,
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"Recycler allocation size is less than object size!");
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return FreeList ? reinterpret_cast<SubClass *>(pop_val())
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: static_cast<SubClass *>(Allocator.Allocate(Size, Align));
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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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push(reinterpret_cast<FreeNode *>(Element));
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}
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void PrintStats();
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};
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template <class T, size_t Size, size_t Align>
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void Recycler<T, Size, Align>::PrintStats() {
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size_t S = 0;
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for (auto *I = FreeList; I; I = I->Next)
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++S;
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PrintRecyclerStats(Size, Align, S);
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}
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}
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#endif
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