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fed90b6d09
a new ilist_node class, and remove them. Unlike alist_node, ilist_node doesn't attempt to manage storage itself, so it avoids the associated problems, including being opaque in gdb. Adjust the Recycler class so that it doesn't depend on alist_node. Also, change it to use explicit Size and Align parameters, allowing it to work when the largest-sized node doesn't have the greatest alignment requirement. Change MachineInstr's MachineMemOperand list from a pool-backed alist to a std::list for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54146 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
3.7 KiB
C++
113 lines
3.7 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/AlignOf.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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/// RecyclerStruct - Implementation detail for Recycler. This is a
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/// class that the recycler imposes on free'd memory to carve out
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/// next/prev pointers.
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struct RecyclerStruct {
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RecyclerStruct *Prev, *Next;
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};
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template<>
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struct ilist_traits<RecyclerStruct> : ilist_default_traits<RecyclerStruct> {
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static RecyclerStruct *getPrev(const RecyclerStruct *t) { return t->Prev; }
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static RecyclerStruct *getNext(const RecyclerStruct *t) { return t->Next; }
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static void setPrev(RecyclerStruct *t, RecyclerStruct *p) { t->Prev = p; }
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static void setNext(RecyclerStruct *t, RecyclerStruct *n) { t->Next = n; }
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mutable RecyclerStruct Sentinel;
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RecyclerStruct *createSentinel() const {
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return &Sentinel;
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}
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static void destroySentinel(RecyclerStruct *) {}
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static void deleteNode(RecyclerStruct *) {
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assert(0 && "Recycler's ilist_traits shouldn't see a deleteNode call!");
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}
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};
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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>::Alignment>
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class Recycler {
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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<RecyclerStruct> FreeList;
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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.empty() && "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.empty()) {
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T *t = reinterpret_cast<T *>(FreeList.remove(FreeList.begin()));
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Allocator.Deallocate(t);
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}
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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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assert(sizeof(SubClass) <= Size &&
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"Recycler allocation size is less than object size!");
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assert(AlignOf<SubClass>::Alignment <= Align &&
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"Recycler allocation alignment is less than object alignment!");
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return !FreeList.empty() ?
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reinterpret_cast<SubClass *>(FreeList.remove(FreeList.begin())) :
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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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FreeList.push_front(reinterpret_cast<RecyclerStruct *>(Element));
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}
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void PrintStats() {
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PrintRecyclerStats(Size, Align, FreeList.size());
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}
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};
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}
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#endif
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