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//===-- allocator_common.h --------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef SCUDO_ALLOCATOR_COMMON_H_
#define SCUDO_ALLOCATOR_COMMON_H_
#include "common.h"
#include "list.h"
namespace scudo {
template <class SizeClassAllocator> struct TransferBatch {
typedef typename SizeClassAllocator::SizeClassMap SizeClassMap;
typedef typename SizeClassAllocator::CompactPtrT CompactPtrT;
static const u16 MaxNumCached = SizeClassMap::MaxNumCachedHint;
void setFromArray(CompactPtrT *Array, u16 N) {
DCHECK_LE(N, MaxNumCached);
Count = N;
memcpy(Batch, Array, sizeof(Batch[0]) * Count);
}
void appendFromArray(CompactPtrT *Array, u16 N) {
DCHECK_LE(N, MaxNumCached - Count);
memcpy(Batch + Count, Array, sizeof(Batch[0]) * N);
// u16 will be promoted to int by arithmetic type conversion.
Count = static_cast<u16>(Count + N);
}
void appendFromTransferBatch(TransferBatch *B, u16 N) {
DCHECK_LE(N, MaxNumCached - Count);
DCHECK_GE(B->Count, N);
// Append from the back of `B`.
memcpy(Batch + Count, B->Batch + (B->Count - N), sizeof(Batch[0]) * N);
// u16 will be promoted to int by arithmetic type conversion.
Count = static_cast<u16>(Count + N);
B->Count = static_cast<u16>(B->Count - N);
}
void clear() { Count = 0; }
void add(CompactPtrT P) {
DCHECK_LT(Count, MaxNumCached);
Batch[Count++] = P;
}
void moveToArray(CompactPtrT *Array) {
memcpy(Array, Batch, sizeof(Batch[0]) * Count);
clear();
}
u16 getCount() const { return Count; }
bool isEmpty() const { return Count == 0U; }
CompactPtrT get(u16 I) const {
DCHECK_LE(I, Count);
return Batch[I];
}
TransferBatch *Next;
private:
CompactPtrT Batch[MaxNumCached];
u16 Count;
};
// A BatchGroup is used to collect blocks. Each group has a group id to
// identify the group kind of contained blocks.
template <class SizeClassAllocator> struct BatchGroup {
// `Next` is used by IntrusiveList.
BatchGroup *Next;
// The compact base address of each group
uptr CompactPtrGroupBase;
// Cache value of SizeClassAllocatorLocalCache::getMaxCached()
u16 MaxCachedPerBatch;
// Number of blocks pushed into this group. This is an increment-only
// counter.
uptr PushedBlocks;
// This is used to track how many bytes are not in-use since last time we
// tried to release pages.
uptr BytesInBGAtLastCheckpoint;
// Blocks are managed by TransferBatch in a list.
SinglyLinkedList<TransferBatch<SizeClassAllocator>> Batches;
};
} // namespace scudo
#endif // SCUDO_ALLOCATOR_COMMON_H_
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